Seamless bearing pipe for telescopic walking system of excavator

Abstract

The utility model discloses a seamless bearing pipe for a telescopic walking system of an excavator. The seamless bearing pipe comprises two telescopic pipe groups and a connecting sleeve, the two telescopic pipe sets are linearly arranged, and the opposite ends of the two telescopic pipe sets stretch into the connecting sleeve correspondingly and are connected with the connecting sleeve. The telescopic pipe set comprises a first steel pipe and a second steel pipe. One end of the first steel pipe extends into the second steel pipe and can stretch out and draw back relative to the second steel pipe. The second steel pipes are arranged in the two ends of the connecting sleeve and are fixedly connected with the connecting sleeve; and the other end of the first steel pipe is connected with a corresponding main beam on the telescopic walking system of the excavator. By means of the structural design of the telescopic pipe set, the stability and the side inclination supporting force of the telescopic beam structure are effectively improved, and therefore the telescopic performance of the telescopic walking system of the excavator is improved; according to the telescopic pipe set, the telescopic friction resistance between the first steel pipe and the second steel pipe is small, the service life is long, and the practical performance is excellent.

Description

A seamless load-bearing tube for an excavator telescopic walking system Technical Field

[0001] This utility model relates to the field of engineering vehicle technology, and in particular to a seamless load-bearing tube for an excavator telescopic walking system. Background Technology

[0002] Seamless load-bearing tubes, also known as telescopic beams, are used in excavator telescopic travel systems for extending and retracting. Currently, most telescopic beams are made from round tubes or welded shaped tubes, which have certain limitations in use. Round telescopic beams lack sufficient lateral support, resulting in significant swaying; welded shaped tubes have poor dimensional accuracy, and unstable clearance control can easily lead to excessive gaps, causing misalignment and friction during extension and retraction, making the tubes less durable; additionally, welded tubes have low strength, and there is a risk of cracking at the weld seams.

[0003] Chinese patent CN 211472670 U discloses a telescopic beam structure and an excavator. The telescopic beam is composed of a first telescopic beam and a second telescopic beam, both of which have a pentagonal cross-section with two right angles, arranged side by side. This type of telescopic beam has the defects of poor structural stability and poor load-bearing capacity. Summary of the Invention

[0004] This utility model provides a seamless load-bearing pipe for an excavator telescopic walking system, which can solve the above-mentioned defects of existing load-bearing pipes or telescopic beams.

[0005] To solve the above-mentioned technical problems, this utility model provides a seamless load-bearing pipe for an excavator telescopic walking system, including two telescopic pipe groups and a connecting sleeve; the two telescopic pipe groups are arranged linearly, with their opposite ends extending into the connecting sleeve and connected to the connecting sleeve;

[0006] The telescopic tube assembly includes a first steel pipe and a second steel pipe. One end of the first steel pipe extends into the second steel pipe and can telescopically extend relative to the second steel pipe. The second steel pipe is built into both ends of the connecting sleeve and is fixedly connected to the connecting sleeve. The other end of the first steel pipe is connected to the corresponding main beam on the excavator's telescopic travel system.

[0007] In a preferred embodiment of this utility model, the length of the second steel pipe is less than or equal to the length of the connecting sleeve, and the length of the second steel pipe is less than or equal to the length of the first steel pipe.

[0008] In a preferred embodiment of this utility model, the first steel pipe, the second steel pipe, and the connecting sleeve are all seamless hexagonal pipes.

[0009] In a preferred embodiment of this utility model, the edges of the first steel pipe, the second steel pipe, and the connecting sleeve are connected by arcs.

[0010] In a preferred embodiment of this utility model, the arc angle of the arc is R10-R20.

[0011] In a preferred embodiment of the present invention, the hexagonal tube includes a top edge, a bottom edge, a first side edge connected to both sides of the top edge, and a second side edge connected to both sides of the bottom edge;

[0012] The outer wall surface of the second steel pipe and the inner wall surface of the connecting sleeve fit together tightly;

[0013] The outer wall surfaces of the first and second sides of the first steel pipe are in close contact with the inner wall surfaces of the first and second sides of the second steel pipe.

[0014] In a preferred embodiment of this utility model, the gap at the tight fit is 0-0.5mm.

[0015] In a preferred embodiment of this utility model, the gap at the tight fit is 0.2-0.4 mm.

[0016] The beneficial effects of this utility model are as follows: This utility model provides a seamless load-bearing tube for an excavator telescopic walking system. Through the structural design of the telescopic tube assembly, the stability and lateral tilt support of the telescopic beam structure are effectively improved, thereby improving the telescopic performance of the excavator telescopic walking system. The telescopic tube layers of this utility model have low telescopic friction resistance between the tube layers, long service life, and excellent practical performance. Attached Figure Description

[0017] Figure 1 is a front view structural schematic diagram of a preferred embodiment of a seamless load-bearing tube for an excavator telescopic walking system according to the present invention.

[0018] Figure 2 is a schematic diagram of the cross-sectional structure of the telescopic pipe assembly;

[0019] The components in the attached diagram are labeled as follows: 10. First steel pipe, 20. Second steel pipe, 30. Connecting sleeve. Detailed Implementation

[0020] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the scope of protection of the present invention.

[0021] Example 1

[0022] As shown in Figures 1 and 2, this utility model discloses a seamless load-bearing pipe for an excavator telescopic walking system, including two telescopic pipe assemblies and a connecting sleeve 30.

[0023] The two telescopic tube assemblies are arranged linearly, with one end connected to the corresponding main beam on the excavator's telescopic travel system, and the other ends facing each other, extending into connecting sleeves. That is, the two telescopic tube assemblies connected together by the connecting sleeves constitute a seamless load-bearing tube for the excavator's telescopic travel system. The elongation or shortening of the seamless load-bearing tube is determined by the main beams at both ends.

[0024] Specifically, the telescopic tube assembly includes a first steel pipe 10 and a second steel pipe 20. The first steel pipe 10 is an inner tube with an arc-shaped notch at one end for fixed connection with the main beam; its other end extends into the second steel pipe 20 and can extend and retract relative to the second steel pipe 20.

[0025] The second steel pipe 20 is an intermediate layer pipe, which is built into both ends of the connecting sleeve 30 and fixedly connected to the connecting sleeve 30. It can enhance the overall strength of the telescopic beam, improve the lateral support force, and thus improve the overall load-bearing capacity of the telescopic beam.

[0026] The first steel pipe 10, the second steel pipe 20 and the connecting sleeve 30 are all seamless steel pipes with high dimensional accuracy, which can effectively reduce the friction between the steel pipes during the elongation or shortening process, reduce the expansion and contraction force, and improve the service life.

[0027] The length of the second steel pipe 20 is less than or equal to the length of the connecting sleeve 30, and also less than or equal to the length of the first steel pipe 10.

[0028] Specifically, the length of the first steel pipe 10 is 571 mm, the length of the second steel pipe 20 is 56 mm, and the length of the connecting sleeve 30 is 578 mm. Designing the length of the second steel pipe 20 to be shorter than the length of the first steel pipe 10 helps to reduce costs and lighten the overall weight of the telescopic beam while ensuring sufficient support.

[0029] The first steel pipe 10, the second steel pipe 20 and the connecting sleeve 30 all have hexagonal cross sections, and the connection between the sides is an arc connection, with the arc angle being R10-R20, preferably R15, to facilitate the expansion and contraction of the steel pipe and reduce expansion and contraction resistance.

[0030] Specifically, the hexagonal tube includes a top edge, a bottom edge, a first side edge connected to both sides of the top edge, and a second side edge connected to both sides of the bottom edge.

[0031] The second steel pipe 20 and the connecting sleeve 30 have the same structure. The outer wall surface of the second steel pipe 20 and the inner wall surface of the connecting sleeve 30 can fit tightly together, and the gap after fitting is 0.2mm.

[0032] The structure of the first steel pipe 10 is not entirely the same as that of the second steel pipe 20 and the connecting sleeve 30. Specifically, the lengths of the first and second sides of the second steel pipe 20 and the connecting sleeve 30 are both longer than the lengths of the first and second sides of the first steel pipe 10. The distance between the top edge of the first steel pipe 10 and the top edge of the second steel pipe 20 is greater than the distance between the bottom edge of the first steel pipe 10 and the top edge of the second steel pipe 20. The outer wall surfaces of the first and second sides of the first steel pipe 10 are tightly fitted with the inner wall surfaces of the first and second sides of the second steel pipe, with a fitting clearance of 0.3-0.5 mm.

[0033] Specifically, the first steel pipe 10, the second steel pipe 20 and the connecting sleeve 30 are all prepared using seamless cold drawing multi-deformation technology, and the formed steel pipes are sequentially fitted and assembled into a telescopic pipe group.

[0034] The above structure and design facilitate the extension or retraction of the first steel pipe 10 relative to the second steel pipe 20, reducing the number of friction surfaces and improving the flexibility of the telescopic beam's extension and retraction.

[0035] The seamless load-bearing tube of this invention has high dimensional precision, low frictional resistance during telescopic movement, long service life, and excellent lateral tilt support, which can effectively improve the telescopic performance of the excavator's telescopic walking system.

[0036] The above description is merely an embodiment of this utility model and does not limit the patent scope of this utility model. Any equivalent structural or procedural transformations made based on the description and drawings of this utility model, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this utility model.

Claims

1. A seamless load-bearing tube for an excavator telescopic walking system, characterized in that, It includes two telescopic pipe assemblies and a connecting sleeve; the two telescopic pipe assemblies are linearly arranged, with their opposite ends extending into and connected to the connecting sleeve; each telescopic pipe assembly includes a first steel pipe and a second steel pipe, one end of the first steel pipe extending into the second steel pipe and capable of telescopic movement relative to the second steel pipe; the second steel pipe is built into both ends of the connecting sleeve and fixedly connected to the connecting sleeve; the other end of the first steel pipe is connected to the corresponding main beam on the excavator's telescopic travel system.

2. The seamless load-bearing tube according to claim 1, characterized in that, The length of the second steel pipe is less than or equal to the length of the connecting sleeve, and the length of the second steel pipe is less than or equal to the length of the first steel pipe.

3. The seamless load-bearing tube according to claim 2, characterized in that, The first steel pipe, the second steel pipe, and the connecting sleeve are all seamless hexagonal pipes.

4. The seamless load-bearing tube according to claim 3, characterized in that, The edges of the first steel pipe, the second steel pipe, and the connecting sleeve are connected by arcs.

5. The seamless load-bearing tube according to claim 4, characterized in that, The arc angle of the arc is R10-R20.

6. The seamless load-bearing tube according to claim 3, characterized in that, The hexagonal tube includes a top edge, a bottom edge, a first side edge connected to both sides of the top edge, and a second side edge connected to both sides of the bottom edge; the outer wall surface of the second steel tube and the inner wall surface of the connecting sleeve are tightly fitted together; the outer wall surfaces of the first and second side edges of the first steel tube are tightly fitted together with the inner wall surfaces of the first and second side edges of the second steel tube.

7. The seamless load-bearing tube according to claim 6, characterized in that, The gap at the tight fit is 0-0.5mm.

8. The seamless load-bearing tube according to claim 7, characterized in that, The gap at the tight fit is 0.2-0.4 mm.

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