Large-cylinder-diameter hydraulic cylinder, guide sleeve structure of large-cylinder-diameter hydraulic cylinder and engineering machinery

Abstract

The utility model discloses a large-cylinder-diameter hydraulic cylinder, a guide sleeve structure of the large-cylinder-diameter hydraulic cylinder and engineering machinery. The large-cylinder-diameter hydraulic cylinder comprises a first guide sleeve, a second guide sleeve and a main sealing component. The first guide sleeve is sleeved on the piston rod and is fixed on the cylinder barrel through a first connecting part; the piston rod is sleeved with the second guide sleeve, the second guide sleeve is fixed to the first guide sleeve through a second connecting part, and the first guide sleeve and the second guide sleeve which are connected play a role in supporting and guiding when the piston rod reciprocates; the main sealing component is arranged between the opposite circumferential faces of the second guide sleeve and the piston rod, and the main sealing component is replaced by detaching the second guide sleeve. The guide sleeve is of a split structure, the self weight is reduced, assembly is convenient, and the problem that a large-cylinder-diameter hydraulic cylinder guide sleeve is difficult to assemble is effectively solved.

Description

Technical Field

[0001] The utility model relates to a guiding sleeve structure for a large-bore hydraulic cylinder, belonging to the technical field of large-bore hydraulic cylinders. Background Technique

[0002] With the rapid development of the construction machinery industry, the requirements for hydraulic cylinders, one of the key components, are getting higher and higher. The output force demand is increasing, and the cylinder bore specifications are also getting larger.

[0003] At present, the guiding sleeves of traditional-structured hydraulic cylinders are generally assembled and fixed by threaded or flange screw structures. The guiding sleeve with a flange screw structure is as follows Figure 1 shown. First, the sealing system 1 is installed on the guiding sleeve 2, then the whole guiding sleeve is separately installed on the piston rod 3, and then a week of screws 4 are arranged in a circumferential pattern to fix the guiding sleeve on the cylinder barrel 5 to complete the assembly. The guiding sleeve with a threaded structure is as follows Figure 2 shown. Similarly, first, the sealing system 1 is installed on the guiding sleeve 2, then the guiding sleeve is separately installed on the piston rod 3, and then the guiding sleeve is fixed on the cylinder barrel 5 through the threaded fit of the gland 6 to complete the assembly.

[0004] However, for hydraulic cylinders with a large cylinder bore specification, due to the large difficulty in thread processing and the large self-weight of the guiding sleeve itself, etc., the sealing friction force is large during assembly, the assembly is difficult, and problems such as seal cutting, guiding sleeve bumping, and thread biting are easily caused, seriously affecting the quality of the oil cylinder and the production efficiency. And when replacing the seal during after-sales maintenance, the whole guiding sleeve needs to be removed, the maintenance difficulty is large, and the cost is high. Summary of the Invention

[0005] According to the deficiencies of the prior art, the utility model provides a guiding sleeve structure for a large-bore hydraulic cylinder. The guiding sleeve is a split structure, with the self-weight reduced and the assembly convenient, effectively solving the problem of difficult assembly of the guiding sleeve for a large-bore hydraulic cylinder.

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

[0007] In a first aspect, the utility model provides a guiding sleeve structure for a large-bore hydraulic cylinder, including:

[0008] A first guiding sleeve, sleeved on the piston rod and fixed on the cylinder barrel through a first connecting component;

[0009] A second guiding sleeve, sleeved on the piston rod and fixed on the first guiding sleeve through a second connecting component. The connected first and second guiding sleeves play a supporting and guiding role in the reciprocating movement of the piston rod;

[0010] A main sealing component, arranged between the circumferential surfaces of the second guiding sleeve and the piston rod facing each other, and the main sealing component is replaced by removing the second guiding sleeve.

[0011] In some embodiments, the outer end region of the axial inner hole of the first guide sleeve is provided as a stepped hole, the second guide sleeve is sleeved on the piston rod and completely inserted into the stepped hole, and the outer side surfaces of the first guide sleeve and the second guide sleeve are flush.

[0012] In some embodiments, a week of uniformly spaced through holes Ⅰ are provided on the flange structure at the outer side surface of the second guide sleeve, thus forming a flange structure, and a week of uniformly spaced threaded holes Ⅰ corresponding to the through holes Ⅰ one by one are provided at the step of the first guide sleeve; the second connecting member is a plurality of screws Ⅰ, and the second guide sleeve and the first guide sleeve are fixed together by the plurality of screws Ⅰ.

[0013] In some embodiments, a week of uniformly spaced through holes Ⅱ are provided on the flange structure at the outer side surface of the first guide sleeve, thus forming a flange structure, and a week of uniformly spaced threaded holes Ⅱ corresponding to the through holes Ⅱ one by one are provided on the axial surface of the cylinder barrel; the first connecting member is a plurality of screws Ⅱ, and the first guide sleeve and the cylinder barrel are fixed together by the plurality of screws Ⅱ.

[0014] In some embodiments, an open groove is provided on the inner circumferential surface of the second guide sleeve, and the main sealing member is arranged in the open groove.

[0015] In some embodiments, at least one seal is installed between the facing circumferential surfaces of the first guide sleeve and the cylinder barrel.

[0016] In some embodiments, at least one seal is installed between the facing circumferential surfaces of the first guide sleeve and the piston rod.

[0017] In some embodiments, at least one seal is installed between the facing circumferential surfaces of the first guide sleeve and the second guide sleeve.

[0018] In a second aspect, the present invention provides a large-bore hydraulic cylinder, including a cylinder barrel and a piston rod located in the cylinder barrel, and the above-mentioned large-bore hydraulic cylinder guide sleeve structure is installed between the cylinder barrel and the piston rod.

[0019] In a third aspect, the present invention provides a construction machinery, including the above-mentioned large-bore hydraulic cylinder.

[0020] Advantageous effects of the present invention:

[0021] By optimizing the guide sleeve structure, the present invention adopts a split double-flange structure form, optimizes the relatively heavy guide sleeve into a split structure, separates the assembly to reduce the influence of the friction force of the sealing system and its own weight on the assembly process. At the same time, the main sealing groove is an open groove, which is convenient for sealing assembly, and the double-flange screw assembly structure has a smaller assembly tightening torque and is convenient for assembly. It effectively solves the problem of difficult assembly of the guide sleeve of the large-bore hydraulic cylinder. Brief Description of the Drawings

[0022] The drawings, as part of the present utility model, are used to provide a further understanding of the present utility model. The schematic embodiments of the present utility model and their descriptions are used to explain the present utility model, but do not constitute an improper limitation to the present utility model. Obviously, the drawings in the following description are only some embodiments, and for those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0023] In the drawings:

[0024] Figure 1 is the front sectional view of the guide sleeve of the flange screw structure of the prior art;

[0025] Figure 2 is the side sectional view of the guide sleeve of the flange screw structure of the prior art;

[0026] Figure 3 is the front sectional view of the guide sleeve of the thread structure of the prior art;

[0027] Figure 4 is the front sectional view of the split double flange structure guide sleeve of the present utility model;

[0028] Figure 5 is the side sectional view of the split double flange structure guide sleeve of the present utility model.

[0029] Reference signs in the drawings: 10 - second guide sleeve, 20 - screw Ⅰ, 30 - main sealing component, 40 - first guide sleeve.

[0030] It should be noted that these drawings and the text description are not intended to limit the scope of the concept of the present utility model in any way, but to illustrate the concept of the present utility model to those skilled in the art by referring to specific embodiments. Detailed Embodiments

[0031] To make the objectives, technical solutions and advantages of the embodiments of the present utility model clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the drawings in the embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but do not limit the scope of the present utility model.

[0032] In the description of the present utility model, it should be noted that the orientation or positional relationship indicated by the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0033] In the description of the present utility model, it should be noted that unless otherwise clearly specified and defined, the terms "installation", "connection", and "coupling" 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 those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0034] As Figure 4 、 Figure 5 shown, a guiding sleeve structure of a large-bore hydraulic cylinder includes a first guiding sleeve 40, a second guiding sleeve 10, and a main sealing component 30; the first guiding sleeve 40 is sleeved on the piston rod and fixed to the cylinder barrel through a first connecting component; the second guiding sleeve 10 is sleeved on the piston rod and fixed to the first guiding sleeve 40 through a second connecting component. The connected first and second guiding sleeves support and guide the piston rod during reciprocating motion; the main sealing component 30 is arranged between the circumferential surfaces of the second guiding sleeve 10 and the piston rod facing each other, and the main sealing component 30 can be replaced by removing the second guiding sleeve 10.

[0035] The following further describes the above-mentioned first guiding sleeve and second guiding sleeve.

[0036] Continuing to refer to Figure 4 、 Figure 5 shown, the outer end region of the axial inner hole of the first guiding sleeve 40 is provided with a stepped hole. After the second guiding sleeve 10 is sleeved on the piston rod, it is completely inserted into the stepped hole, and the outer side surfaces of the first guiding sleeve 40 and the second guiding sleeve 10 are flush.

[0037] In a further embodiment, continuing to refer to Figure 4 、 Figure 5 shown, a flange structure is formed by providing a circumferentially evenly spaced set of through holes Ⅰ on the flange structure at the outer side surface of the second guiding sleeve 10. Threaded holes Ⅰ that are circumferentially evenly spaced and correspond one-to-one with the through holes Ⅰ are provided at the step of the first guiding sleeve 40; the second connecting component is a plurality of screws Ⅰ 20, and the second guiding sleeve 10 and the first guiding sleeve 40 are fixed together by the plurality of screws Ⅰ 20.

[0038] In a further embodiment, continuing to refer to Figure 4 、 Figure 5 shown, a flange structure is formed by providing a circumferentially evenly spaced set of through holes Ⅱ on the flange structure at the outer side surface of the first guiding sleeve 40. Threaded holes Ⅱ that are circumferentially evenly spaced and correspond one-to-one with the through holes Ⅱ are provided on the axial surface of the cylinder barrel; the first connecting component is a plurality of screws Ⅱ, and the first guiding sleeve 40 and the cylinder barrel are fixed together by the plurality of screws Ⅱ.

[0039] For a further solution, continue to refer to Figure 4 and Figure 5 As shown, a circumferential open groove is provided on the inner circumferential surface of the second guide sleeve 10, and the main sealing component 30 is arranged in the open groove.

[0040] For a further solution, continue to refer to Figure 4 and Figure 5 As shown, at least one seal is installed between the circumferential surfaces of the first guide sleeve 40 facing the cylinder barrel. At least one seal is installed between the circumferential surfaces of the first guide sleeve 40 facing the piston rod. At least one seal is installed between the circumferential surfaces of the first guide sleeve 40 and the second guide sleeve 10 facing each other.

[0041] The following gives the assembly process of the guide sleeve structure of the large-bore hydraulic cylinder:

[0042] As Figure 4 and Figure 5 shown, similar to the existing flange structure, first install some seals on the first guide sleeve 40, then fix it on the cylinder barrel through the screws II arranged in a circle, and then install the remaining seals on the second guide sleeve 10, including the main sealing component 30, and then fix it on the first guide sleeve 40 through the screws I 20 arranged in a circle to complete the assembly. The above solution divides the guide sleeve into two parts for assembly, reducing the self-weight of the guide sleeve and facilitating assembly; the seals are separated on the two guide sleeves, reducing the friction during assembly and facilitating assembly; the main sealing groove is an open groove, facilitating assembly; the main sealing component is on the outer guide sleeve, and only half of the guide sleeve needs to be removed for replacing the main seal during maintenance, facilitating maintenance; there is no need to machine large threads, facilitating machining; screw connection requires a smaller tightening torque compared to large thread connection, facilitating assembly.

[0043] In summary, through the optimization of the guide sleeve structure, the present utility model adopts a split double-flange structure form, optimizes the relatively heavy guide sleeve into a split structure, separates the assembly to reduce the influence of the friction of the sealing system and the self-weight on the assembly process. At the same time, the main sealing groove is an open groove, facilitating the sealing assembly, and the double-flange screw assembly structure has a smaller assembly tightening torque, facilitating assembly. It effectively solves the problem of difficult assembly of the guide sleeve of the large-bore hydraulic cylinder.

[0044] Next, the large-bore hydraulic cylinder provided by the present utility model will be described. The large-bore hydraulic cylinder described below can be mutually corresponded and referred to with the large-bore hydraulic cylinder guide sleeve structure described above.

[0045] A large-bore hydraulic cylinder provided by the present utility model may include the large-bore hydraulic cylinder guide sleeve structure described in any one of the above embodiments.

[0046] The beneficial effects achieved by the large-bore hydraulic cylinder provided by the present utility model are consistent with those achieved by the guide sleeve structure of the large-bore hydraulic cylinder provided by the present utility model, and thus will not be elaborated here.

[0047] The construction machinery provided by the present utility model will be described below. The construction machinery described below can be correspondingly referred to the large-bore hydraulic cylinder described above.

[0048] A construction machinery provided by the present utility model may include the large-bore hydraulic cylinder described in any one of the above embodiments.

[0049] The beneficial effects achieved by the construction machinery provided by the present utility model are consistent with those achieved by the large-bore hydraulic cylinder provided by the present utility model, and thus will not be elaborated here.

[0050] It should be noted that the above construction machinery can be a crawler crane, a crawler excavator, a crawler pump truck or other crawler construction machinery.

[0051] In the specification provided here, a large number of specific details are described. However, it can be understood that the embodiments of the present utility model can be practiced without these specific details. In some instances, well-known methods, structures and technologies are not shown in detail so as not to obscure the understanding of this specification.

[0052] In addition, those skilled in the art can understand that although some embodiments described herein include certain features contained in other embodiments rather than other features, the combination of features of different embodiments also means that it is within the protection scope of the present utility model and forms different embodiments. For example, in the above embodiments, those skilled in the art can use them in a combined manner according to the known technical solutions and the technical problems to be solved by this application.

[0053] The above are only the preferred embodiments of the present utility model, and do not impose any form of limitation on the present utility model. Although the present utility model has been disclosed above with the preferred embodiments, it is not intended to limit the present utility model. Any person skilled in the art of this patent, without departing from the scope of the technical solution of the present utility model, can make some changes or modifications to the equivalent embodiments by using the technical content prompted above. However, as long as it does not depart from the content of the technical solution of the present utility model, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present utility model still fall within the scope of the technical solution of the present utility model.

Claims

1. A guiding sleeve structure for a large-bore hydraulic cylinder, characterized in that Comprising: A first guide sleeve, sleeved on the piston rod and fixed to the cylinder barrel through a first connecting component; A second guide sleeve, sleeved on the piston rod and fixed to the first guide sleeve through a second connecting component. The connected first and second guide sleeves play a supporting and guiding role when the piston rod reciprocates; A main sealing component, arranged between the circumferential surfaces of the second guide sleeve and the piston rod facing each other, and the main sealing component is replaced by removing the second guide sleeve.

2. The guiding sleeve structure of a large-bore hydraulic cylinder according to claim 1, wherein: The outer end region of the axial inner hole of the first guide sleeve is provided as a stepped hole. After the second guide sleeve is sleeved on the piston rod, it is completely inserted into the stepped hole, and the outer side surfaces of the first guide sleeve and the second guide sleeve are flush.

3. The guiding sleeve structure of a large-bore hydraulic cylinder according to claim 2, wherein: A week of uniformly spaced through holes Ⅰ are provided on the flange structure at the outer side surface of the second guide sleeve, thereby forming a flange structure. Threaded holes Ⅰ that are uniformly spaced in a week and correspond to the through holes Ⅰ one by one are provided at the step of the first guide sleeve; The second connecting component is a plurality of screws Ⅰ, and the second guide sleeve and the first guide sleeve are fixed together through the plurality of screws Ⅰ.

4. The guiding sleeve structure of a large-bore hydraulic cylinder according to claim 1, wherein: A week of uniformly spaced through holes Ⅱ are provided on the flange structure at the outer side surface of the first guide sleeve, thereby forming a flange structure. Threaded holes Ⅱ that are uniformly spaced in a week and correspond to the through holes Ⅱ one by one are provided on the axial surface of the cylinder barrel; The first connecting component is a plurality of screws Ⅱ, and the first guide sleeve and the cylinder barrel are fixed together through the plurality of screws Ⅱ.

5. The guiding sleeve structure of a large-bore hydraulic cylinder according to claim 1, wherein: An open groove is provided on the inner circumferential surface of the second guide sleeve, and the main sealing component is arranged in the open groove.

6. The guiding sleeve structure of a large-bore hydraulic cylinder according to claim 1, wherein: At least one sealing member is installed between the circumferential surfaces of the first guide sleeve and the cylinder barrel facing each other.

7. The guiding sleeve structure of a large-bore hydraulic cylinder according to claim 1, wherein: At least one sealing member is installed between the circumferential surfaces of the first guide sleeve and the piston rod facing each other.

8. The guiding sleeve structure of a large-bore hydraulic cylinder according to claim 1, wherein: At least one sealing member is installed between the circumferential surfaces of the first guide sleeve and the second guide sleeve facing each other.

9. A large-bore hydraulic cylinder, comprising a cylinder barrel and a piston rod located in the cylinder barrel, wherein: The guiding sleeve structure of the large-bore hydraulic cylinder according to any one of claims 1 to 8 is installed between the cylinder barrel and the piston rod.

10. An engineering machinery, wherein: It comprises a large-bore hydraulic cylinder according to claim 9.

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