Static seal protection structure of thrust wheel assembly, walking mechanism and excavator

Abstract

The utility model discloses a static seal protection structure of a thrust wheel assembly, a walking mechanism and an excavator. The static seal protection structure comprises a dynamic seal component, a first static seal component, a second static seal component and a third static seal component, the dynamic sealing part is arranged between the opposite side surfaces of the thrust wheel body and the shaft seat; the first static sealing part is mounted between the opposite circumferential surfaces of the shaft seat between the inner side of the pin shaft and the outer side of the thrust wheel body and the central shaft; the second static sealing part is arranged between the opposite circumferential surfaces of the shaft seat on the outer side of the pin shaft and the central shaft, so that the sealing between the shaft seat and the central shaft is realized; the third static sealing part is installed between the pin shaft located below the center shaft and the circumferential face opposite to the pin shaft in the axial direction, and leakage of internal lubricating oil liquid is prevented. The utility model is innovated and optimized on the basis of the traditional design, the static sealing grooves are arranged at the outer end of the shaft seat and the lower end of the pin hole, and are far away from the bearing area of the wheel body, so that the sealing protection is more effective, safer and more reliable.

Description

Technical Field

[0001] The utility model relates to a static sealing protection structure of a track wheel assembly, belonging to the technical field of track wheel sealing. Background Art

[0002] The walking mechanism of the chassis assembly of a large mining excavator consists of guide wheels, supporting rollers, supporting rollers, driving wheels and crawler tracks, which are called "four wheels and one belt". The supporting roller assembly, guide wheel assembly and supporting chain wheel assembly are all self-sealing and self-lubricating structures, that is, a sealed oil chamber is provided in the wheel body, and no additional external oiling maintenance is required. The internal self-lubrication is achieved, and the internal oil is effectively sealed through the sealing structure.

[0003] The main function of the track roller assembly of a large mining excavator is to transfer the weight of the whole machine to the crawler track. It is subject to large impact loads during excavation and travel, and the working conditions are harsh, so high sealing requirements are required. The seals of the track roller assembly are mainly divided into dynamic seals and static seals. The dynamic seal uses a pair of floating seal components to achieve sealing during the rotation of the wheel body, while the end of the track roller shaft seat is statically sealed through an O-ring to prevent internal lubricating oil leakage.

[0004] like Figure 1 As shown, in the traditional structural design, the chassis rollers of large mining excavators have static sealing grooves on both sides of the central axis, and the static sealing of the shaft seat ends is achieved by installing O-rings, so as to prevent the internal oil from leaking or flowing out. However, the structural dimensions of the roller assembly of large mining excavators are relatively large, and it is currently impossible to conduct bench simulation nuclear running tests. Usually, when a separate roller assembly is installed and pressurized for air tightness testing, there is no oil seepage at the static seal. However, after the whole machine is installed, oil seepage or leakage will occur at the static seal. Therefore, this form of sealing protection is far from achieving static sealing protection. The rollers bear the weight of the entire machine, and the risk of static seal oil leakage cannot be completely avoided with a single static sealing structure. Summary of the invention

[0005] In order to safely and reliably realize static sealing protection of the supporting wheel and reduce the product failure rate, the utility model provides a static sealing protection structure of the supporting wheel assembly, which realizes sealing protection in multiple directions and has higher safety.

[0006] The utility model is implemented according to the following technical solutions:

[0007] In a first aspect, the utility model provides a static sealing protection structure of a track roller assembly, comprising:

[0008] A dynamic sealing component is installed between the side surfaces of the track roller body and the shaft seat facing each other;

[0009] A first static sealing component is installed between the shaft seat between the inner side of the pin shaft and the outer side of the supporting wheel body and the peripheral surface facing the central axis;

[0010] The second static sealing component is installed between the shaft seat located outside the pin shaft and the peripheral surface facing the central axis to achieve sealing between the shaft seat and the central axis;

[0011] The third static sealing component is installed between the pin shaft located below the central shaft and the circumferential surface of the shaft seat facing each other to prevent leakage of the internal lubricating oil.

[0012] In some embodiments, the second static sealing component is composed of at least one O-ring II; at least one circumferential groove is provided on the inner circumferential surface of the shaft seat facing the outer circumferential surface of the center shaft, and the O-ring II is installed in the groove, and the O-ring II protrudes from the groove to seal the gap between the shaft seat and the center shaft.

[0013] In some embodiments, the third static sealing component is composed of at least one O-ring III; at least one circumferential groove is provided on the inner circumferential surface of the shaft seat facing the outer circumferential surface of the pin shaft, and the O-ring III is installed in the groove, and the O-ring III protrudes from the groove to seal the gap between the shaft seat and the pin shaft.

[0014] In some embodiments, the pin shaft is inserted into the shaft seat and the central shaft, and the pin shaft and the central shaft are arranged perpendicular to each other.

[0015] In some embodiments, the first static sealing component is composed of at least one O-ring I; at least one circumferential groove is provided on the outer circumferential surface of the central shaft facing the inner circumferential surface of the shaft seat, and the O-ring I is installed in the groove, and the O-ring I protrudes from the groove to seal the gap between the shaft seat and the central shaft.

[0016] In some embodiments, the dynamic sealing component is composed of at least one pair of floating sealing components; each side of the supporting roller body facing the axle seat is provided with at least one corresponding and circumferential groove, and the paired floating sealing components are installed in the groove to seal the gap between the supporting roller body and the axle seat.

[0017] In some embodiments, the axle seat and the track roller body are positioned with a stop structure.

[0018] In some embodiments, the shaft seat is provided with a flange extending in the radial direction on the axial surface facing the supporting wheel body, and the supporting wheel body is provided with a groove extending in the axial direction on the axial surface facing the shaft seat, and the flange is arranged in the groove to form the stop structure.

[0019] In a second aspect, the utility model further provides a walking mechanism, including a longitudinal beam structure and a track roller assembly, on which at least one static sealing protection structure of the track roller assembly is installed.

[0020] In a third aspect, the utility model further provides an excavator, which is equipped with at least one static sealing protection structure of the above-mentioned supporting wheel assembly; or, is equipped with the above-mentioned walking mechanism.

[0021] Compared with the prior art, the utility model has the following beneficial effects:

[0022] The utility model can effectively solve the risk of oil leakage of single-layer static seals of super-large tonnage mining excavators, especially under load conditions, and solves the disadvantages of traditional designs. The utility model is an innovative optimization based on the traditional design. Static sealing grooves are opened at the outer end of the shaft seat and the lower end of the pin hole, away from the wheel body load area, and the sealing protection is more effective, safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an improper limitation on the present invention. Obviously, the accompanying drawings described below are only some embodiments. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0024] In the attached picture:

[0025] Figure 1 This is a schematic diagram of the design of a static sealing protection structure of a traditional structure;

[0026] Figure 2 This is a schematic diagram of the static sealing protection structure design of the utility model;

[0027] Figure 3 A schematic diagram of the groove structure of the shaft seat of the utility model;

[0028] Figure 4 A schematic diagram of the actual sealing of the installation of the track roller assembly of the utility model.

[0029] The accompanying drawings are marked as follows: 1. supporting wheel body; 2. floating sealing component; 3. shaft seat; 4. pin shaft; 5. center shaft; 6. O-ring I; 7. O-ring II; 8. O-ring III; 3-1. groove; 3-2. groove; I. longitudinal beam structure.

[0030] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model but are not used to limit the scope of the utility model.

[0032] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0033] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figure 2 As shown, a static sealing protection structure of a supporting wheel assembly includes a dynamic sealing component, a first static sealing component, a second static sealing component, and a third static sealing component; the dynamic sealing component is installed between the side surfaces facing each other of the supporting wheel body 1 and the axle seat 3; the first static sealing component is installed between the inner side of the pin shaft 4 and the outer side of the supporting wheel body 1 and between the circumferential surfaces facing each other of the axle seat 3 and the central axis 5; the second static sealing component is installed between the circumferential surfaces facing each other of the axle seat 3 and the central axis 5 located outside the pin shaft 4 to achieve sealing between the axle seat 3 and the central axis 5; the third static sealing component is installed between the pin shaft 4 located below the central axis 5 and the circumferential surfaces facing each other of the axle seat 3 to prevent leakage of internal lubricating oil.

[0035] The second static sealing component is further described below.

[0036] like Figure 2 , Figure 3 As shown, the second static sealing component is composed of at least one O-ring II7; at least one groove 3-1 is arranged around the inner peripheral surface of the shaft seat 3 facing the outer peripheral surface of the central shaft 5, and the O-ring II7 is installed in the groove 3-1, and the O-ring II7 protrudes from the groove 3-1, which is used to seal the gap between the shaft seat 3 and the central shaft 5. This groove 3-1 is designed at the outermost end of the shaft seat 3, away from the wheel body bearing area, and eliminates the static seal failure pressure of the supporting roller due to the bearing force of the supporting roller assembly in the traditional design.

[0037] The third static sealing component mentioned above is further described below.

[0038] like Figure 2 , Figure 3 As shown, the third static sealing component is composed of at least one O-ring III8; at least one surrounding groove 3-2 is provided on the inner peripheral surface of the shaft seat 3 facing the outer peripheral surface of the pin shaft 4, and the O-ring III8 is installed in the groove 3-2, and the O-ring III8 protrudes from the groove 3-2, which is used to seal the gap between the shaft seat 3 and the pin shaft 4, to ensure effective sealing of the lower end of the supporting wheel assembly after assembly is completed, and effectively prevent leakage of internal lubricating oil.

[0039] The third static sealing component mentioned above is further described below.

[0040] like Figure 2 As shown, the first static sealing component is composed of at least one O-ring Ⅰ6; at least one circumferential groove is provided on the outer peripheral surface of the central shaft 5 facing the inner peripheral surface of the shaft seat 3, and the O-ring Ⅰ6 is installed in the groove, and the O-ring Ⅰ6 protrudes from the groove, which is used to seal the gap between the shaft seat 3 and the central shaft 5.

[0041] The above-mentioned dynamic sealing component is further described below.

[0042] like Figure 2 As shown, the dynamic sealing component is composed of at least one pair of floating sealing components 2; the sides of the supporting roller body 1 facing the axle seat 3 are each provided with at least one corresponding and surrounding groove, and the paired floating sealing components 2 are installed in the groove to seal the gap between the supporting roller body 1 and the axle seat 3.

[0043] Further solutions, such as Figure 2 As shown, the pin shaft 4 is inserted into the shaft seat 3 and the central shaft 5, and the pin shaft 4 and the central shaft 5 are arranged in a perpendicular manner to each other.

[0044] Further solutions, such as Figure 2 As shown, the axle seat 3 and the track roller body 1 are positioned with a stop structure.

[0045] The preferred solution is Figure 2 As shown, the shaft seat 3 is provided with a flange extending in the radial direction on the axial surface facing the supporting roller body 1, and the supporting roller body 1 is provided with a groove extending in the axial direction on the axial surface facing the shaft seat 3, and the flange is arranged in the groove to form a stop structure.

[0046] The lubrication method of the utility model is as follows: after the assembly of the supporting roller assembly is completed, oil is injected into the internal oil cavity through the oil plug. There is a lubricating oil cavity inside the supporting roller assembly. There is a clearance fit between the central shaft 5 and the supporting roller body 1, and there is a clearance fit between the shaft seat 3 and the central shaft 5. The internal lubricating oil can leak out along the gap between the central shaft 5 and the supporting roller body 1 and the gap between the central shaft 5 and the shaft seat 3. The shaft seat 3 of the supporting roller assembly is fixedly connected to the longitudinal beam structure I together with the central shaft 5. The supporting roller body 1 rotates relative to the shaft seat 3 around the central shaft 5, and dynamic sealing protection is achieved by relying on the floating sealing component 2. A groove is opened on the central shaft 5, and an O-ring is installed to achieve the first layer of static sealing protection. The traditional protection method only stays at the first layer of static sealing, which will cause the static sealing to fail after bearing a large load. If oil leakage occurs due to failure, the oil will continue to extend outward and flow out along the gap to the outer end of the shaft seat and the lower end of the pin hole. The design adds O-ring II 7 and O-ring III 8 to form a second layer of static sealing protection, which improves product reliability and service life.

[0047] like Figure 4 As shown, the utility model also provides a walking mechanism, including a longitudinal beam structure I and a supporting roller assembly, and at least one static sealing protection structure of the supporting roller assembly is installed on the supporting roller assembly.

[0048] The utility model also provides an excavator, which is equipped with at least one static sealing protection structure of the above-mentioned supporting wheel assembly; or is equipped with the above-mentioned walking mechanism.

[0049] In summary, the utility model can effectively solve the risk of oil leakage of single-layer static seals of super-large tonnage mining excavators, especially under load conditions, and solves the drawbacks of traditional designs. The utility model is an innovative optimization based on the traditional design. Static sealing grooves are opened at the outer end of the shaft seat and the lower end of the pin hole, away from the wheel body load area, and the sealing protection is more effective, safer and more reliable.

[0050] In the description provided herein, a large number of specific details are described. However, it is understood that embodiments of the present invention can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0051] In addition, those skilled in the art will understand that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments also means being within the scope of protection of the present utility model and forming different embodiments. For example, in the above embodiments, those skilled in the art can use them in combination according to the known technical solutions and the technical problems to be solved by the present application.

[0052] The above is only a preferred embodiment of the utility model, and does not limit the utility model in any form. Although the utility model has been disclosed as a preferred embodiment as above, it is not used to limit the utility model. Any technician familiar with this patent can make some changes or modify the technical content suggested above into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the utility model. However, any simple modification, equivalent change and modification made to the above embodiment based on the technical essence of the utility model without departing from the content of the technical solution of the utility model still falls within the scope of the solution of the utility model.

Claims

1. A static sealing protection structure of a track roller assembly, comprising: A dynamic sealing component is installed between the side surfaces of the track roller body and the shaft seat facing each other; A first static sealing component is installed between the shaft seat between the inner side of the pin shaft and the outer side of the supporting wheel body and the peripheral surface facing the central axis; It is characterized by further comprising: The second static sealing component is installed between the shaft seat located outside the pin shaft and the peripheral surface facing the central axis to achieve sealing between the shaft seat and the central axis; The third static sealing component is installed between the pin shaft located below the central shaft and the circumferential surface of the shaft seat facing each other to prevent leakage of the internal lubricating oil.

2. The static sealing protection structure of a track roller assembly according to claim 1, characterized in that: The second static sealing component is composed of at least one O-ring II; at least one circumferential groove is provided on the inner circumferential surface of the shaft seat facing the outer circumferential surface of the central shaft, and the O-ring II is installed in the groove, and the O-ring II protrudes from the groove, and is used to seal the gap between the shaft seat and the central shaft.

3. The static sealing protection structure of a track roller assembly according to claim 1, characterized in that: The third static sealing component is composed of at least one O-ring III; at least one circumferential groove is provided on the inner circumferential surface of the shaft seat facing the outer circumferential surface of the pin shaft, and the O-ring III is installed in the groove, and the O-ring III protrudes from the groove, and is used to seal the gap between the shaft seat and the pin shaft.

4. The static sealing protection structure of a track roller assembly according to claim 1, characterized in that: The pin shaft is inserted into the shaft seat and the central shaft, and the pin shaft and the central shaft are arranged in a mutually perpendicular manner.

5. The static seal protection structure of a track roller assembly according to claim 1, characterized in that: The first static sealing component is composed of at least one O-ring I; at least one circumferential groove is provided on the outer circumferential surface of the central shaft facing the inner circumferential surface of the shaft seat, and the O-ring I is installed in the groove, and the O-ring I protrudes from the groove to seal the gap between the shaft seat and the central shaft.

6. The static seal protection structure of a track roller assembly according to claim 1, characterized in that: The dynamic sealing component is composed of at least one pair of floating sealing components; the sides of the supporting wheel body facing the axle seat are each provided with at least one corresponding and surrounding groove, and the paired floating sealing components are installed in the groove to seal the gap between the supporting wheel body and the axle seat.

7. The static seal protection structure of a track roller assembly according to claim 1, characterized in that: The axle seat and the supporting wheel body are positioned with a stop structure.

8. The static seal protection structure of a track roller assembly according to claim 7, characterized in that: The shaft seat is provided with a flange extending in the radial direction on the axial surface facing the supporting wheel body, and the supporting wheel body is provided with a groove extending in the axial direction on the axial surface facing the shaft seat. The flange is arranged in the groove to form the stop structure.

9. A walking mechanism, comprising a longitudinal beam structure and a track wheel assembly, characterized in that: At least one static sealing protection structure of the track roller assembly according to any one of claims 1 to 8 is installed on the track roller assembly.

10. An excavator, characterized in that: A static sealing protection structure having at least one track roller assembly as claimed in any one of claims 1 to 8 installed; or a walking mechanism as claimed in claim 9 installed.

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