A telescopic cylinder and climbing method of an ultra-large tonnage all-terrain crane and a telescopic arm

Abstract

A telescopic cylinder and climbing method and telescopic arm of an ultra-large tonnage all-terrain crane, comprising a sleeve, one end of which is connected to a tail slider; an anti-collision guide structure is provided above the sleeve; polygonal slide plates are provided on both sides of the sleeve, one end of the polygonal slide plate is connected to the anti-collision guide structure through a front guide slider support, a front guide slider support plate and a front guide slider, the other end of the polygonal slide plate is connected to a hydraulic cylinder head, a plurality of slide brackets for fixing the polygonal slide plate are provided on the sleeve, and a front slider is connected to the lower side of the sleeve through a front slider bracket. The telescopic cylinder and telescopic arm of the ultra-large tonnage all-terrain crane of the present invention are provided with a sleeve to protect the telescopic cylinder and improve the reliability of the telescopic cylinder; the large-angle rail entry guide, the anti-collision dispersion resistance of the tail slide and the traction climbing structure of the front slider improve the stability of the telescopic cylinder in the telescopic arm of the crane.

Description

Technical Field

[0001] The invention relates to the technical field of engineering machinery, in particular to a telescopic cylinder and a climbing method and a telescopic arm of an ultra-large tonnage all-terrain crane. Background Art

[0002] At present, with the rapid development of large-scale wind power market and economy, there are more and more high-power wind power projects in the country, with wind turbine height greater than 165 meters and power exceeding 3.0MW. Wind power equipment is getting taller and taller, and its tonnage is also getting bigger and bigger. The tonnage of installation equipment, maintenance equipment, and testing equipment is also getting bigger and bigger. Cranes are the main equipment for lifting, maintenance, and testing projects. The original 300-ton all-terrain cranes can no longer meet market demand. At the same time, in multiple wind power projects, the telescopic cylinders of all-terrain cranes collided with the telescopic arms of the cranes during the climbing process, resulting in the suspension of wind power projects and serious damage to the lifting equipment, which has a serious impact on the rapid advancement of wind power projects.

[0003] The telescopic cylinder is the main actuator in the telescopic system of the crane. The telescopic arm of the crane generally uses the telescopic cylinder to drive the telescopic movement. Due to the different sizes of the telescopic arms of the crane, before the telescopic cylinder enters the next arm, the front slider located just below the sleeve on the outer wall of the cylinder contacts the climbing cylinder at the bottom of the boom and climbs up along the climbing cylinder. Slideways are installed on both sides of the cylinder, which support and guide the telescopic cylinder so that the telescopic cylinder can slide freely in the square box of the telescopic arm of the crane. When the upper cylinder head of the telescopic cylinder is fixed to a certain telescopic arm, the extension and retraction of the telescopic arm of the crane can be driven by the extension of the telescopic cylinder. After the telescopic cylinder climbs to a horizontal position along the slope of the climbing cylinder, the slideway structures on both sides of the telescopic cylinder enter the boom groove rail. Before the slideway structure enters the boom groove rail, the left and right sliders located at the front end of the guide rail bracket will enter the boom groove rail in advance to play a guiding role. However, in the process of climbing the cylinder, the end of the cylinder often jumps upward or swings left and right due to excessive movement speed, causing damage to the cylinder, arm pin bolts and guide rail bracket. It can be seen that the failure of the telescopic cylinder will definitely affect the use of the crane, and may even cause safety accidents in serious cases. Therefore, it is very important to improve the quality and reliability of the telescopic cylinder.

[0004] The existing super-large tonnage all-terrain crane has a large lifting telescopic arm interface, large volume, and heavy weight. The guide groove of the telescopic cylinder driving the telescopic arm is located in the middle of the telescopic arm. To ensure that the telescopic cylinder can drive the telescopic arm, that is, the telescopic cylinder thrust (F=(π / 4)×D 2×P) can push its corresponding telescopic arm. In order to minimize the weight of the oil cylinder, improve the lightweight level, and increase the lifting weight of the crane, the slide adopts an external cylinder barrel upper end surface, and the slide bracket is welded to the cylinder barrel by split welding. The slides are fixed on the cylinder barrel of the telescopic oil cylinder by welding. A large number of support plates are welded on the cylinder barrel, and then the slides on both sides are connected to the support plates by bolts. Among them, the support plate plays the role of supporting and fixing the slide to prevent the slide from bending and deformation. Although the structure is simple in form and easy to process, there are many problems: at the same time, the left and right shape and position tolerances of the slide are difficult to guarantee, and there are many welding points, which can easily cause deformation of the inner hole of the cylinder barrel. At the same time, there is no guide and mechanical anti-collision structure at the bottom of the telescopic oil cylinder. When telescopic operation, it is easy for the crane telescopic arm to collide, which leads to safety accidents. Therefore, how to avoid the defects of cylinder deformation, safety hazards and difficult repair caused by welding has become a technical problem that needs to be solved urgently by technical personnel in this field.

[0005] In current technology, telescopic cylinders have the following disadvantages: (1) There are many welded parts, and the cylinder barrel is easily deformed due to welding, which affects the roundness and straightness of the inner hole. The welding of a large number of support plates on the outer circle of the cylinder barrel causes the cylinder barrel to deform due to heat, which seriously affects the dimensional accuracy and roundness of the inner hole of the cylinder barrel; (2) The physical properties of the cylinder barrel material are reduced. Excessively high temperatures during welding will cause changes in the microstructure of the material around the cylinder weld, reducing strength and posing a safety hazard; (3) Low assembly efficiency. Due to the large number of brackets welded and manual welding, welding errors are bound to occur during the welding process. When assembling the slide plate, the size needs to be adjusted and rework is required, which is time-consuming and labor-intensive, resulting in low assembly efficiency and a low yield rate; (4) Poor maintainability. If the slide is damaged or the shape and position tolerance of the bracket welding is difficult to guarantee, the slide needs to be removed, the support plate needs to be polished off and re-welded, which is a large workload and difficult to repair; (5) Poor reliability. There is no anti-collision structure at the bottom of the telescopic cylinder. During the climbing process, the end of the cylinder jumps upward or swings left and right due to the rapid movement speed, which can easily cause damage to the cylinder, arm pin bolts and guide brackets, thereby affecting the reliability of the cylinder. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the deficiencies of the above-mentioned prior art and provide a telescopic arm and climbing method and a telescopic cylinder of an ultra-large tonnage all-terrain crane with a simple structure and good effect.

[0007] The present invention is implemented with the following technical scheme: a telescopic cylinder of an ultra-large tonnage all-terrain crane, comprising a sleeve arranged on the outer wall of the bottom end of the telescopic cylinder barrel, one end of the sleeve is connected to a tail slider via a tail end cover; an anti-collision guide structure is provided above the sleeve; polygonal slide plates are provided on both sides of the sleeve, one end of the polygonal slide plate is connected to the anti-collision guide structure via a front guide slider support, a front guide slider support plate and a front guide slider, the other end of the polygonal slide plate is connected to a hydraulic cylinder head, a plurality of slide brackets for fixing the polygonal slide plate are provided on the sleeve, and a front slider is connected to the bottom of the sleeve via a front slider bracket.

[0008] Furthermore, the sleeve is a long thin-walled tube structure, the axis of the sleeve is coaxial with the cylinder barrel of the telescopic oil cylinder and holds the cylinder barrel tightly; the tail slider is in a semi-spherical shape, and the material of the tail slider is impact-resistant MC nylon.

[0009] The inner hole of the sleeve is 2 mm larger than the outer wall of the telescopic cylinder, the wall thickness of the sleeve is 6 mm, and the material of the sleeve is a high-strength and high-toughness material, which is a customized material XG720. The yield strength of the customized material is 720Mpa and the impact energy at -20°C is 49J.

[0010] One end of the anti-collision guide structure is in tangential contact with the plane of the tail slider, and an acute angle is formed between the end of the anti-collision guide structure that is tangent to the tail slider and the sleeve; the other end face of the anti-collision guide structure is parallel to the sleeve, and the distance between the parallel end face of the anti-collision guide structure and the center of the telescopic cylinder is 10 to 15 mm smaller than the distance between the lower plane of the cylinder head arm pin bolt and the center line of the boom groove rail.

[0011] The front slider bracket is welded on the sleeve, and the front slider is connected to the front slider bracket through screws.

[0012] The front sliding block is provided with a guide surface inclined to the axial direction of the cylinder barrel, and the angle between the guide surface and the axis of the cylinder barrel is 10° to 30°.

[0013] Front guide slider supports are symmetrically arranged on both sides of the anti-collision guide structure, and the front guide slider supports are parallel to the upper end surface of the anti-collision guide structure, and the upper end surface of the front guide slider supports is 5mm to 10mm lower than the upper end surface of the anti-collision guide structure; the front guide slider support is provided with a guide section and a matching section, and the end of the guide section close to the cylinder bottom is an acute angle and the edge is chamfered, and the inclination angle of the matching section is smaller than that of the guide section and is parallel to the front guide slider.

[0014] The polygonal slide plate is fixed to the slide bracket by screws, and the slide bracket is coaxially fixed with the sleeve. The inner diameter of the slide bracket is 2 mm larger than the outer diameter of the sleeve.

[0015] A climbing method for a telescopic cylinder of an ultra-large tonnage all-terrain crane comprises the following steps:

[0016] S1. The tail slider first enters the crane telescopic arm using the spherical shape. The shape is originally the spherical center and there will be no collision;

[0017] S2, the front slider climbs along the bottom of the telescopic arm and drives the telescopic cylinder to move forward;

[0018] S3. When the front slider climbs and runs to the middle position of the slider, the left and right front guide sliders begin to slowly enter the crane telescopic arm;

[0019] S4. After the current slider completely enters the telescopic arm and runs 160mm, the left and right front guide sliders completely enter the telescopic arm of the crane, and then drive the telescopic cylinder and the telescopic system to complete entering the guide rail, thereby driving the extension and retraction of the telescopic arm of the crane.

[0020] A telescopic arm comprises the above-mentioned telescopic cylinder of the super-large tonnage all-terrain crane and a climbing method of the telescopic cylinder of the super-large tonnage all-terrain crane.

[0021] The present invention has the following advantages: the telescopic oil cylinder and climbing method and telescopic arm of the super-large tonnage all-terrain crane of the present invention weld the upper, lower, left, right and front and rear brackets to the sleeve, avoiding the phenomenon that the inner hole of the cylinder is deformed due to welding deformation caused by welding deformation of the cylinder, protecting the telescopic oil cylinder and improving the reliability of the telescopic oil cylinder; the large-angle rail entry guide, the anti-collision dispersion resistance of the tail slideway and the traction climbing structure of the front slider improve the stability of the telescopic oil cylinder in the telescopic arm of the crane; the welding-free octagonal slideway bracket replaces the split welding slideway structure, realizes the welding-free connection between the slideway bracket and the cylinder, eliminates the influence of the cylinder welding stress, and increases the bearing capacity and running stability of the slideways on the left and right sides. When the cylinder is machined, the welding process of the slideway plate and the slideway bracket is reduced, the production capacity is released, and the assembly efficiency is significantly improved; at the same time, the slideway can be assembled into the cylinder after the overall assembly, realizing the integral assembly of the left and right slideways, optimizing the assembly process, and the installation and disassembly are convenient, saving labor and time, improving production efficiency, and high economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a front view of the present invention;

[0023] Figure 2 is a bottom view of the present invention;

[0024] Figure 3 is a front view of the slideway bracket of the present invention;

[0025] Figure 4 It is a left side view of the slideway bracket of the present invention;

[0026] Figure 5 It is a structural schematic diagram of the sleeve of the present invention;

[0027] Figure 6 It is a structural schematic diagram of the front guide slider support of the present invention;

[0028] Figure 7 It is a schematic diagram of the overall structure of the present invention.

[0029] In the figure: 1. tail slider, 2. tail end cover, 3. sleeve, 4. anti-collision guide structure, 5. guide support plate, 6. rib plate, 7. front slider, 8. front slider bracket, 9. front guide slider support, 10. front guide slider support plate, 11. front side guide slider, 12. slide bracket, 13. polygonal slide plate, 14. telescopic cylinder, 15. hydraulic cylinder head. DETAILED DESCRIPTION

[0030] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0031] like Figures 1 to 7 The telescopic cylinder of an ultra-large tonnage all-terrain crane shown in the figure includes a sleeve 3 arranged on the outer wall of the bottom end of the cylinder barrel of the telescopic cylinder 14, one end of the sleeve 3 is connected to the tail slider 1 through the tail end cover 2; an anti-collision guide structure 4 is provided above the sleeve 3; polygonal slide plates 13 are provided on both sides of the sleeve 3, one end of the polygonal slide plate 13 is connected to the anti-collision guide structure 4 through a front guide slider support 9, a front guide slider support plate 10 and a front guide slider 11, the other end of the polygonal slide plate 13 is connected to the hydraulic cylinder head 15, a plurality of slide brackets 12 for fixing the polygonal slide plate 13 are provided on the sleeve 3, and the bottom of the sleeve 3 is connected to the front slider 7 through a front slider bracket 8.

[0032] like Figures 1 to 7The telescopic cylinder of an ultra-large tonnage all-terrain crane shown in the figure, the sleeve 3 is a long thin-walled tube structure, the axis of the sleeve 3 is coaxial with the cylinder barrel of the telescopic cylinder 14 and holds the cylinder barrel tightly. The inner hole of the sleeve 3 is 2 mm larger than the outer wall of the cylinder barrel of the telescopic cylinder 14, the wall thickness of the sleeve 3 is 6 mm, and the material of the sleeve 3 is a high-strength and high-toughness material, which is a customized material XG720, and the yield strength of the customized material is 720Mpa and the impact energy at -20℃ is 49J. The telescopic oil cylinder of the super-large tonnage all-terrain crane of the present invention comprises a telescopic oil cylinder, a sleeve, a tail slider, a tail end cover, an anti-collision guide structure, a guide support plate (5), a front guide slider support, a front guide slider support plate, a front side guide slider, a slide bracket, a polygonal slide plate, etc., wherein the tail slider is arranged at the bottom end of the cylinder barrel to prevent the cylinder barrel from colliding with the telescopic arm; the sleeve is arranged outside the outer wall of the bottom end of the cylinder barrel, the sleeve is a long thin-walled tube structure, and the sleeve is respectively fixed with connecting brackets at the front, back, left, right, top and bottom, so as to reduce the welding of the connecting brackets on the cylinder barrel, prevent the cylinder barrel from being deformed, and can play a protective role on the cylinder barrel; the inner hole is 2mm larger than the outer circle (outer wall) of the cylinder barrel, is arranged outside the bottom end of the cylinder barrel, the axis is coaxial with the cylinder barrel and holds the cylinder barrel tightly, the wall thickness is 6mm, and it is made of high-strength and high-toughness material, which can play a protective role on the cylinder barrel and prevent the cylinder barrel from being deformed; the sleeve is provided with a plurality of connecting brackets on the sleeve, and the connecting brackets are provided ... An anti-collision guide structure is installed on the end surface, and a rib plate (6) is provided on the anti-collision guide structure. The anti-collision guide structure is arranged so that when the telescopic oil cylinder jumps or swings during the process of climbing the cylinder, the anti-collision structure collides or contacts with the structure in the telescopic arm, thereby preventing the cylinder from being damaged; a front slider is arranged on the lower end surface of the sleeve, and is fixed to the sleeve through a front slider bracket; front side guide sliders are arranged horizontally on both sides of the telescopic oil cylinder, and the uppermost end surface is lower than the guide bracket (5) on the anti-collision guide structure, so as to ensure that the anti-collision guide structure first enters the telescopic arm of the crane, and then enters the telescopic arm through the front side guide slider, and the right end of the slider is connected and fixed to the slide plate, and the two slide plates are fixed to each other through the middle integral welding-free slide bracket, so as to avoid the split welding bracket. The shape and position tolerance of the slide is difficult to ensure due to welding deformation, and the influence of the weld on the cylinder strength and the inner hole size tolerance during welding. The invention has the advantages of simple structure, convenient assembly and disassembly, good maneuverability and strong maintainability. The slideway structure, sliding block and slideway bracket corresponding structural parts are arranged on the left and right sides of the upper end of the telescopic oil cylinder. The slideway and the oil cylinder are not in the same plane, which saves the volume and cross-section of the oil cylinder and has stronger applicability.

[0033] like Figures 1 to 7 The telescopic oil cylinder of an ultra-large tonnage all-terrain crane shown in the figure, the tail slider 1 is in a semi-spherical shape, and the material of the tail slider 1 is impact-resistant MC nylon. The tail slider of the present invention is in a semi-spherical shape and is made of impact-resistant nylon material, which can disperse the impact resistance between the telescopic oil cylinder and the telescopic arm of the crane when the telescopic oil cylinder climbs the cylinder, and prevents the cylinder from interfering with the telescopic arm of the crane during the climbing process of the telescopic oil cylinder; the tail slider is fixed to the sleeve by screws and a cover plate on the end face of the sleeve.

[0034] like Figures 1 to 7 The telescopic cylinder of an extra-large tonnage all-terrain crane shown in the figure has one end of the anti-collision guide structure 4 in tangential contact with the plane of the tail slider 1, and an acute angle is formed between the end of the anti-collision guide structure 4 tangent to the tail slider 1 and the sleeve 3; the other end face of the anti-collision guide structure 4 is parallel to the sleeve 3, and the distance between the parallel end face of the anti-collision guide structure 4 and the center of the telescopic cylinder 15 is 10 to 15 mm smaller than the distance between the lower plane of the cylinder head arm pin bolt and the center line of the boom groove rail. The upper end surface of the sleeve of the present invention is equipped with an anti-collision guide structure. The left end of the anti-collision guide structure is in tangential contact with the tail slider plane and forms an acute angle, which can achieve a smooth transition with a large inclination angle to prevent interference, and can achieve better inclination angle requirements for rail entry. The guide support plate (5) on the upper end surface of the anti-collision guide structure is a guide plane, which is placed horizontally and is consistent with the direction of the cylinder barrel. The dimension of the upper plane from the center of the oil cylinder is 10 to 15 mm smaller than the dimension of the lower plane of the cylinder head arm pin bolt from the center line of the boom groove rail. The problem of collision between the oil cylinder and the arm pin bolt caused by the upward jump of the oil cylinder when climbing the cylinder can be solved, and guidance can be provided when the cylinder barrel enters the tail of the crane telescopic arm.

[0035] like Figures 1 to 7 The telescopic cylinder of a super-large tonnage all-terrain crane shown in the figure, the front slider bracket 8 is welded on the sleeve 3, and the front slider 7 is connected to the front slider bracket 8 by screws. The front slider 7 is provided with a guide surface inclined to the axial direction of the cylinder, and the angle between the guide surface and the axis of the cylinder is 10° to 30°. The lower end surface of the sleeve of the present invention is provided with a front slider bracket, which is fixed to the sleeve by welding, and the front slider is connected and fixed to the front slider bracket by screws, which is mainly used for the telescopic cylinder and the climbing cylinder in the telescopic arm to contact and cooperate with each other. The front slider is provided with an inclined guide surface inclined relative to the axial direction of the cylinder, and the angle between the guide surface and the axis of the cylinder is 10° to 30°, which prevents collision with the climbing cylinder in the initial stage of climbing the cylinder and improves the stability of the telescopic cylinder climbing. Since the front slider does not enter the guide rail of the crane telescopic arm in the initial stage of climbing the cylinder, if the telescopic cylinder swings left and right at this time, it will cause a collision between the telescopic cylinder and the guide rail.

[0036] like Figures 1 to 7The telescopic cylinder of an extra-large tonnage all-terrain crane is shown in the figure, and front guide slider supports 9 are symmetrically provided on both sides of the anti-collision guide structure 4, and the front guide slider support 9 is parallel to the upper end surface of the anti-collision guide structure 4, and the upper end surface of the front guide slider support 9 is 5mm to 10mm lower than the upper end surface of the anti-collision guide structure 4; the front guide slider support 9 is provided with a guiding section and a matching section, and the end of the guiding section close to the cylinder bottom is an acute angle and the edge is chamfered, and the inclination angle of the matching section is smaller than that of the guiding section and is parallel to the front guide slider 11. The anti-collision guide structure of the present invention is connected to a front guide slider support via a guide support plate (5) on both sides, which can effectively prevent collision damage caused by the left and right swing of the telescopic oil cylinder. The front guide slider support is placed horizontally with the upper end surface of the anti-collision guide structure, and its upper end surface is 5mm to 5mm lower than the upper end surface of the anti-collision guide structure. The front guide slider support is provided with a guide section and a matching section. The left end of the guide section is an acute angle structure, and C15 chamfers are provided on the top and bottom to prevent collision with the crane, and plays a role in guiding the telescopic oil cylinder to enter the telescopic arm guide rail of the crane horizontally, which is a third anti-collision device. The matching section has the function of extending the guide length and can seamlessly transition to the left and right slider guide surfaces. The left and right edges of the guide section gradually expand to both sides to smoothly connect with the matching section so as to gradually guide the matching section into the guide rail. After the chamfer, there is still a matching section with a chamfer of less than 38°. The width of the guide section and the matching section is equal, that is, when the telescopic oil cylinder enters the telescopic arm normally, the guide section ends its function and the matching section starts to work, which plays a role in the operation coordination between the telescopic oil cylinder and the telescopic arm. The left and right front guide sliders are connected to the guide support plate (5) by screws, and the guide support plate is connected and fixed to the front guide slider support by screws. The left width of the left and right front guide sliders is the same as that of the front guide slider support, and the right width is the same as that of the polygonal slide plate, and is connected and fixed to the polygonal slide plate by screws.

[0037] like Figures 1 to 7The telescopic cylinder of an ultra-large tonnage all-terrain crane shown in the figure, the polygonal slide plate 13 is fixed to the slide bracket 12 by screws, the slide bracket 12 is coaxially fixed with the sleeve 3, and the inner diameter of the slide bracket 12 is 2 mm larger than the outer diameter of the sleeve 3. Compared with the original ordinary U-shaped slide, the overall length of the polygonal slide plate of the present invention is increased by 13%, the cross-sectional area of ​​the slide is increased by 28%, the positive stress of the edge of the slide plate material is switched from the original longitudinal direction to the radial direction, which is exactly opposite to the end face of the slide bracket, the local stresses offset each other, the contact area is significantly increased, the bending moment deformation resistance of the slide plate is improved, the bending stiffness of the slide plate is increased by 35%, the flexible deformation of the slide plate is reduced, and the moment of inertia of the slide section is significantly increased by 42%. The performance of the slide plate such as bending stiffness, shear resistance and deformation resistance is significantly improved, and the overall stability is strong; at the same time, the two polygonal slide plates are fixed to each other through the middle integral non-welding slide bracket, which avoids the difficulty in ensuring the shape and position tolerance of the slide due to welding deformation of the split welding bracket, and the influence of the weld on the strength of the cylinder and the inner hole size tolerance during welding; the slide bracket is connected and fixed with the outer circle of the sleeve, the inner hole diameter of the slide bracket is 2 mm larger than the outer diameter of the sleeve, the slide bracket is placed outside the sleeve, and the sleeve plays an internal supporting and fixing role for the slide bracket, the slide bracket, sleeve, and cylinder center line are coaxial, the left and right ends of the slide bracket are radially connected to the polygonal slide plate by screws, and the polygonal slide plate is connected and fixed by several slide brackets, so that when the telescopic oil cylinder runs in the guide rail of the crane telescopic arm, it plays a role of limiting fixation and traction guidance. The right end of the polygonal slide plate is connected to the hydraulic cylinder head, which can protect the telescopic function when the cylinder arm pin is pulled out and inserted.

[0038] A climbing method for a telescopic cylinder of an ultra-large tonnage all-terrain crane comprises the following steps:

[0039] S1, the tail slider 1 first enters the crane telescopic arm using the spherical shape, which is originally the spherical shape and will not cause collision;

[0040] S2, the front slider 7 climbs along the bottom of the telescopic arm and drives the telescopic cylinder to move forward;

[0041] S3, when the front slide block 7 climbs and runs to the middle position of the slide block, the left and right front guide slide blocks 11 begin to slowly enter the crane telescopic arm;

[0042] S4. After the current slider completely enters the telescopic arm and runs 160MM, the left and right front guide sliders 11 completely enter the telescopic arm of the crane, thereby driving the telescopic cylinder and the telescopic system to complete entering the guide rail, thereby driving the extension and retraction of the telescopic arm of the crane.

[0043] The climbing method of the present invention has the advantage of preventing the telescopic oil cylinder from leading or the left and right side slide blocks from entering the guide rail first, thereby preventing the front slide block from being unable to enter the guide rail and causing collision with the telescopic oil cylinder.

[0044] A telescopic arm comprises the above-mentioned telescopic cylinder of an ultra-large tonnage all-terrain crane and a climbing method of the telescopic cylinder of the ultra-large tonnage all-terrain crane.

[0045] Finally, it should be noted that the above description is only a preferred example of the present invention and is not intended to limit the present invention. Although the present invention is described in detail with reference to the above embodiments, those skilled in the art can still modify the technical solutions described in the above embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A telescopic cylinder for an ultra-large tonnage all-terrain crane, characterized in that: The invention comprises a sleeve (3) arranged on the outer wall of the bottom end of the cylinder barrel of a telescopic oil cylinder (14), one end of the sleeve (3) being connected to a tail slider (1) via a tail end cover (2); an anti-collision guide structure (4) being arranged above the sleeve (3); polygonal slide plates (13) being arranged on both sides of the sleeve (3), one end of the polygonal slide plate (13) being connected to the anti-collision guide structure (4) via a front guide slider support (9), a front guide slider support plate (10) and a front guide slider (11), the other end of the polygonal slide plate (13) being connected to a hydraulic cylinder head (15); a plurality of slide brackets (12) for fixing the polygonal slide plates (13) being arranged on the sleeve (3), and a front slider (7) being connected to the bottom of the sleeve (3) via a front slider bracket (8); One end of the anti-collision guide structure (4) is in tangential contact with the plane of the tail slider (1), and the end of the anti-collision guide structure (4) that is tangential to the tail slider (1) forms an acute angle with the sleeve (3); the other end face of the anti-collision guide structure (4) is parallel to the sleeve (3), and the distance between the parallel end face of the anti-collision guide structure (4) and the center of the telescopic cylinder (14) is 10 to 15 mm smaller than the distance between the lower plane of the cylinder head arm pin bolt and the center line of the boom groove rail.

2. The telescopic cylinder of an ultra-large tonnage all-terrain crane according to claim 1, characterized in that: The sleeve (3) is a long thin-walled tube structure, the axis of the sleeve (3) is coaxial with the cylinder barrel of the telescopic oil cylinder (14) and holds the cylinder barrel tightly; the tail slider (1) is in a semi-spherical shape, and the material of the tail slider (1) is impact-resistant MC nylon.

3. The telescopic cylinder of an ultra-large tonnage all-terrain crane according to claim 2, characterized in that: The inner hole of the sleeve (3) is 2 mm larger than the outer wall of the cylinder barrel of the telescopic oil cylinder (14); the wall thickness of the sleeve (3) is 6 mm; the material of the sleeve (3) is a high-strength and high-toughness material, which is a customized material XG720; the yield strength of the customized material is 720 MPa and the impact energy at -20°C is 49 J.

4. The telescopic cylinder of an ultra-large tonnage all-terrain crane according to claim 1, characterized in that: The front slider bracket (8) is welded to the sleeve (3), and the front slider (7) is connected to the front slider bracket (8) by screws.

5. The telescopic cylinder of an ultra-large tonnage all-terrain crane according to claim 4, characterized in that: The front sliding block (7) is provided with a guide surface inclined to the axial direction of the cylinder barrel, and the angle between the guide surface and the axis of the cylinder barrel is 10° to 30°.

6. The telescopic cylinder of an ultra-large tonnage all-terrain crane according to claim 1, characterized in that: Front guide slider supports (9) are symmetrically arranged on both sides of the anti-collision guide structure (4), the front guide slider supports (9) are parallel to the upper end surface of the anti-collision guide structure (4), and the upper end surface of the front guide slider supports (9) is 5 mm to 10 mm lower than the upper end surface of the anti-collision guide structure (4); the front guide slider supports (9) are provided with a guide section and a matching section, the end of the guide section close to the cylinder bottom is an acute angle and the edge is chamfered, the inclination angle of the matching section is smaller than that of the guide section and is parallel to the front guide slider (11).

7. The telescopic cylinder of an ultra-large tonnage all-terrain crane according to claim 1, characterized in that: The polygonal slide plate (13) is fixed to the slide bracket (12) by means of screws; the slide bracket (12) and the sleeve (3) are coaxially fixed together; the inner diameter of the slide bracket (12) is 2 mm larger than the outer diameter of the sleeve (3).

8. A climbing method using a telescopic cylinder of an ultra-large tonnage all-terrain crane according to claim 1, characterized in that: The steps include: S1, the tail slider (1) first enters the crane telescopic arm using the spherical shape, which is originally a spherical shape and will not cause collision; S2, the front slider (7) climbs along the bottom of the telescopic arm and drives the telescopic cylinder to move forward; S3, when the front slide block (7) climbs and runs to the middle position of the slide block, the left and right front guide slide blocks (11) begin to slowly enter the crane telescopic arm; S4. After the current slider completely enters the telescopic arm and runs 160 mm, the left and right front guide sliders (11) completely enter the telescopic arm of the crane, thereby driving the telescopic cylinder and the telescopic system to complete entering the guide rail, thereby driving the extension and retraction of the telescopic arm of the crane.

9. A telescopic arm, characterized in that: The invention comprises a telescopic cylinder of an ultra-large tonnage all-terrain crane as described in any one of claims 1 to 7 and a climbing method of the telescopic cylinder of an ultra-large tonnage all-terrain crane as described in claim 8.

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