Hydraulic cylinder suitable for working conditions of high-frequency reciprocating impact and large unbalance loading and engineering machinery

Abstract

The utility model discloses a hydraulic cylinder suitable for high-frequency reciprocating impact and large unbalance loading working conditions and engineering machinery. The hydraulic cylinder comprises a cylinder barrel, a guide sleeve with a central through hole, a piston rod, a first sealing assembly and a second sealing assembly. The guide sleeve is coaxially installed on the axial end face of the cylinder barrel. The piston rod is inserted into the cylinder barrel and the guide sleeve, and a piston capable of doing linear reciprocating motion along with the piston rod is installed at the transverse end, located in the cylinder barrel, of the piston rod; the first sealing assembly is arranged between the opposite circumferential surfaces of the guide sleeve and the piston rod; the first sealing assembly mainly consists of a first sealing piece and a double-support structure consisting of a first support ring and a sliding bearing; the second sealing assembly is arranged between the opposite circumferential faces of the piston and the cylinder barrel. The second sealing assembly is mainly composed of a second sealing piece in the middle and second supporting rings on the two sides. The eccentric load resistance of the guide sleeve can be remarkably improved, and the working condition of high oil temperature caused by high-frequency reciprocating impact is greatly improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a kind of hydraulic cylinders suitable for high-frequency reciprocating impact and large eccentric load working condition belong to hydraulic cylinder technical field. BACKGROUND

[0002] Due to its high pressure, high speed, reciprocating motion frequent operating conditions, hydraulic cylinder is worked in high temperature condition for a long time, and in actual use, oil leakage, cylinder pulling problem caused by abnormality such as performance deterioration of sealing element, aging of sealing element material, damage of sealing element, reduction of compression strength of support ring, etc. Cylinder pulling problem even causes the whole hydraulic system of host machine to be scrapped, which seriously affects the use of host machine.

[0003] The prior art discloses a high-pressure working condition high-reliability eccentric load-resistant sealing support system and hydraulic cylinder (CN218151767U), which only relates to the design of the inner hole sealing and support ring of the guide sleeve, and does not design the sealing and support ring structure of the piston part. In this structure, there is no mention of the sealing element, support ring material and support ring inner hole oil groove, and there is no mention of the lubricating effect of the lubricating oil groove. SUMMARY

[0004] In view of the deficiencies in the prior art, the utility model provides a hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load working condition, which can significantly improve the eccentric load resistance of the guide sleeve and greatly improve the working condition caused by high oil temperature under high-frequency reciprocating impact.

[0005] The utility model is implemented according to the following technical solutions:

[0006] In the first aspect, the utility model provides a hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load working condition, which comprises:

[0007] cylinder barrel;

[0008] a guide sleeve with a central through hole is installed on the axial end face of the cylinder barrel in a coaxial manner;

[0009] a piston rod is inserted into the cylinder barrel and the guide sleeve, and a piston capable of following the piston rod for linear reciprocating motion is installed at the transverse end portion located in the cylinder barrel;

[0010] a first sealing assembly is arranged between the circumferential surfaces of the guide sleeve and the piston rod, and the first sealing assembly mainly comprises a first sealing element and a double-support structure composed of a first support ring and a sliding bearing;

[0011] a second sealing assembly is arranged between the circumferential surfaces of the piston and the cylinder barrel, and the second sealing assembly mainly comprises a second sealing element in the middle and two second support rings on both sides.

[0012] In some embodiments, the first sealing assembly is composed of a skeleton dustproof ring, a first support ring, a first sealing element and a sliding bearing arranged in sequence and spaced apart from the outside of the guide sleeve; the skeleton dustproof ring, the first support ring, the first sealing element and the sliding bearing are respectively installed in the annular groove formed on the inner circumferential surface of the guide sleeve.

[0013] In some embodiments, the first sealing element comprises:

[0014] The sealing element and the sealing element retainer are placed in the annular groove after being attached together in the axial direction;

[0015] The buffer sealing element is placed in the annular groove inside the sealing element and the sealing element retainer.

[0016] In some embodiments, the inner circumferential surface of the first support ring is provided with a spiral oil groove having an oil storage function and capable of forming an oil film.

[0017] In some embodiments, the materials of the skeleton dustproof ring, the sealing element and the buffer sealing element are all high-temperature-resistant polyurethane materials; the material of the first support ring is modified reinforced glass fiber nylon material.

[0018] In some embodiments, the second support ring in the second sealing assembly is composed of a support ring I and a support ring II arranged in sequence and spaced apart; the left support ring I and the support ring II, the second sealing element and the right support ring I and the support ring II are respectively installed in the annular groove formed on the outer circumferential surface of the piston.

[0019] In some embodiments, the support ring I, the support ring II, the second sealing element, the support ring II and the support ring I are arranged in sequence and spaced apart on the piston.

[0020] In some embodiments, the material of the second sealing element is high-hardness thermoplastic material; the material of the support ring I is cloth-embedded phenolic material; and the material of the support ring II is modified reinforced glass fiber nylon material.

[0021] In a second aspect, the utility model provides a kind of engineering machinery, including above-mentioned suitable for high frequency reciprocating impact and large eccentric load working condition's hydraulic cylinder.

[0022] In some embodiments, the engineering machinery includes an excavator.

[0023] The utility model has the beneficial effects that:

[0024] 1) By increasing the support ring inside the dustproof ring in the guide sleeve inner hole, the "support ring+sliding bearing" double support type is realized, and the eccentric load resistance of the guide sleeve is significantly improved.

[0025] 2) By replacing the anti-fouling ring on both sides of the outer circle of the piston with a support ring, the support area and span of the outer circle of the piston are increased, and the anti-unbalanced load performance of the piston is significantly improved.

[0026] 3) By designing an oil groove in the inner hole of the support ring at the guide sleeve, the oil film is formed, the lubrication performance is ensured, and the service life of the sealing element and the support ring is improved.

[0027] 4) The support ring and the sealing element are made of high-temperature-resistant material (≥120℃), which greatly improves the working condition of high-frequency reciprocating impact causing high oil temperature.

[0028] 5) The piston sealing body is made of high-hardness thermoplastic material, which significantly improves the high-pressure resistance of the sealing element and prolongs the service life of the sealing element. BRIEF DESCRIPTION OF DRAWINGS

[0029] The accompanying drawings are part of the present application and serve to provide a further understanding of the present application, and the schematic embodiments of the present application and their descriptions serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the drawings described below are only some embodiments, and other drawings can be obtained by those skilled in the art without creative labor.

[0030] In the drawings:

[0031] Figure 1 is a sectional view of the hydraulic cylinder suitable for high-frequency reciprocating impact and large unbalanced load working conditions of the present application.

[0032] Reference signs: 1-piston rod, 2-guide sleeve, 3-cylinder, 4-piston, 5-skeleton dustproof ring, 6-first support ring, 7-sealing element retainer, 8-sealing element, 9-buffer sealing element, 10-sliding bearing, 11-1-support ring I, 11-2-support ring I, 12-1-support ring II, 12-2-support ring II, 13-second sealing element.

[0033] It should be noted that these drawings and written descriptions are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical scheme and advantages of the embodiments of the present application more clear, the technical scheme in the embodiments will be described clearly and completely below with reference to the drawings in the embodiments of the present application. The following embodiments are used to illustrate the present application, but not to limit the scope of the present application.

[0035] In the description of the utility model, it needs to explain, the term "upper", "lower", "front", "back", "left", "right", "vertical", "inner", "outer" and so on indicate the orientation or position relation is based on the orientation or position relation shown in the drawing, just is for the convenience of describing the utility model and simplifying the description, and it is not indicated or implied that the device or element must have a particular orientation, a particular orientation structure and operation, therefore it cannot be understood as the limitation to the utility model.

[0036] In the description of the utility model, it needs to explain, unless another explicit provision and limitation, the term "installation", "connection", "connect" should be broad sense understanding, for example, can be fixed connection, can be detachable connection, or integrally connected, can be mechanical connection, can be electrical connection, can be directly connected, also can be indirectly connected through the intermediate medium.

[0037] As Figure 1 Indicated, a kind of hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load working condition, including cylinder 3, with central through hole guide bushing 2, piston rod 1, first sealing assembly and second sealing assembly;Guide bushing 2 is coaxially installed on the axial end surface of cylinder 3;Piston rod 1 is inserted in cylinder 3 and guide bushing 2, and piston rod 1 is installed with a piston 4 at the transverse end portion in cylinder 3, which can follow piston rod 1 linear reciprocating motion;First sealing assembly is arranged between the circumferential surface of guide bushing 2 and piston rod 1, and first sealing assembly is mainly composed of first sealing piece and double-support structure composed of first support ring 6 and sliding bearing 10;Second sealing assembly is arranged between the circumferential surface of piston 4 and cylinder 3, and second sealing assembly is mainly composed of second sealing piece 13 in the middle and second support ring on both sides.

[0038] The specific structure of the above-mentioned first sealing assembly is further described below.

[0039] Continue to refer to Figure 1 Indicated, first sealing assembly is composed of skeleton dustproof ring 5, first support ring 6, first sealing piece and sliding bearing 10, which are arranged in sequence from the outside of guide bushing 2 to the inside;Skeleton dustproof ring 5, first support ring 6, first sealing piece and sliding bearing 10 are installed in the annular groove on the inside circumferential surface of guide bushing 2.

[0040] Further scheme, continue to refer to Figure 1 Indicated, first sealing piece includes sealing piece 8, sealing piece retainer 7 and buffer sealing piece 9;Sealing piece 8 and sealing piece retainer 7 are placed in annular groove after being attached together in axial direction;Buffer sealing piece 9 is placed in annular groove inside sealing piece and sealing piece retainer.

[0041] Further scheme, continue to refer to Figure 1 As shown in the figure, the inner circumferential surface of the first support ring 6 is provided with a spiral oil groove with oil storage function and capable of forming an oil film.

[0042] In the preferred scheme, the material of the skeleton dustproof ring 5, the sealing element 8 and the buffer sealing element 9 is high-temperature-resistant polyurethane material; the material of the first support ring 6 is modified reinforced glass fiber nylon material; the material of the sealing element retainer 7 is modified PTFE material; and the material of the sliding bearing 10 is a "steel back + copper + PTFE" composite type.

[0043] The specific structure of the second sealing assembly is further described below.

[0044] Continuing to refer to Figure 1 As shown in the figure, the second support ring in the second sealing assembly is composed of the support ring I 11-1, 11-2 and the support ring II 12-1, 12-2 arranged at intervals; the support ring I 11-1 and the support ring II 12-1 on the left side, the second sealing element 13 and the support ring I 11-2 and the support ring II 12-2 on the right side are correspondingly installed in the annular groove opened on the outer circumferential surface of the piston 4.

[0045] Further scheme, continue to refer to Figure 1 As shown in the figure, the support ring I 11-1, the support ring II 12-1, the second sealing element 13, the support ring II 12-2 and the support ring I 11-2 are sequentially and at intervals arranged on the piston 4.

[0046] In the preferred scheme, the material of the second sealing element 13 is high-hardness thermoplastic material; the material of the support ring I 11-1, 11-2 is cloth-embedded phenolic material; and the material of the support ring II 12-1, 12-2 is modified reinforced glass fiber nylon material.

[0047] In summary, the hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load working conditions has the following functions and effects:

[0048] 1. The material of the skeleton dustproof ring 5, the sealing element 8 and the buffer sealing element 9 is high-temperature-resistant polyurethane material (≥120℃), which greatly improves the working condition of high oil temperature caused by high-frequency reciprocating impact; the material of the second sealing element 13 is thermoplastic material + HNBR, and the thermoplastic material has high hardness characteristics, which significantly improves the high-pressure resistance of the sealing element; the material of the first support ring 6, the support ring II 12-1, 12-2 is modified reinforced glass fiber nylon material; the material of the sealing element retainer 7 is modified PTFE material; the material of the support ring I 11-1, 11-2 is cloth-embedded phenolic material; and the material of the sliding bearing 10 is a "steel back + copper + PTFE" composite type.

[0049] 2. The sealing arrangement of the inner hole of the guide sleeve 2 is as follows: a first support ring 6 is arranged between the skeleton dustproof ring 5 and the sealing member stop ring 7 and the sealing member 8, and the inner hole of the first support ring 6 has a spiral oil groove.

[0050] 3. The arrangement of the outer circle support ring of the piston 4 is as follows: support rings I 11-1 and 11-2 are arranged on both sides of the outer circle of the piston 4, support rings II 12-1 and 12-2 are arranged on the inner side, and a second sealing member 13 is arranged between the two support rings, and the outer ring sealing body of the second sealing member 13 is of an open type.

[0051] 4. By arranging the first support ring 6 on the inner side of the dustproof ring in the inner hole of the guide sleeve, the anti-bias load performance is increased; at the same time, the spiral oil groove is designed in the inner hole of the first support ring 6, which has a certain oil storage function to form an oil film, so as to ensure that the support ring, the dustproof ring and the sealing member are in a good lubrication state, and the sealing member 8 and the buffer sealing member 9 are made of high-temperature-resistant polyurethane material, so as to meet the high-temperature working condition caused by high-frequency reciprocating operation.

[0052] 5. By arranging the support rings I 11-1 and 11-2 and the support rings II 12-1 and 12-2 on the outer circle of the piston 4, the existing design structure of arranging the anti-dirt rings on both sides of the piston is cancelled, the support rings are used to replace the anti-dirt rings, the support area and the support span of the outer circle of the piston are increased, and the anti-bias load performance is significantly improved.

[0053] The engineering machinery provided by the utility model is described below, and the engineering machinery described below can be correspondingly referred to the hydraulic cylinder suitable for high-frequency reciprocating impact and large bias load working conditions and described above.

[0054] The engineering machinery provided by the utility model can include the hydraulic cylinder suitable for high-frequency reciprocating impact and large bias load working conditions described in any one of the above embodiments.

[0055] The beneficial effects achieved by the engineering machinery provided by the utility model are consistent with the beneficial effects achieved by the hydraulic cylinder suitable for high-frequency reciprocating impact and large bias load working conditions provided by the utility model, and therefore will not be described here.

[0056] It should be noted that the above engineering machinery can be a tracked excavator, a wheeled excavator or the like.

[0057] In the specification provided herein, a large number of specific details are described. However, it can be understood that the embodiments of the utility model can be practiced without these specific details. In some examples, well-known methods, structures and techniques are not shown in detail in order not to obscure the understanding of the specification.

[0058] In addition, those skilled in the art can understand that, although some embodiments described herein include certain features included in other embodiments rather than other features, combinations of features of different embodiments also mean to be within the protection scope of the present application and form different embodiments. For example, in the above embodiments, those skilled in the art can use in a combined manner according to the known technical solutions and the technical problems to be solved by the present application.

[0059] The above is only the preferred embodiment of the present application, and does not limit the present application in any form. Although the present application has been disclosed as above with the preferred embodiment, it is not intended to limit the present application. Any skilled person in the art can make some changes or modifications within the scope of the technical solutions of the present application by using the above-mentioned technical content, and equivalent embodiments with equivalent changes are equivalent. Any simple modification, equivalent change and modification of the above embodiments according to the technical essence of the present application are still within the scope of the present application.

Claims

1. A hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load conditions, characterized in that, include: Cylinder; A guide sleeve with a central through hole is coaxially mounted on the axial end face of the cylinder. A piston rod is inserted into the cylinder and guide sleeve, and a piston capable of linear reciprocating motion following the piston rod is mounted at the lateral end of the piston rod located in the cylinder. The first sealing assembly is arranged between the circumferential surfaces of the guide sleeve and the piston rod facing each other. The first sealing assembly mainly consists of a first sealing element and a double-support structure composed of a first support ring and a sliding bearing. The second sealing assembly is arranged between the opposing circumferential surfaces of the piston and cylinder. The second sealing assembly mainly consists of a second sealing element in the middle and second support rings on both sides.

2. The hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load conditions according to claim 1, characterized in that: The first sealing assembly consists of a skeleton dustproof ring, a first support ring, a first sealing element, and a sliding bearing, which are arranged in sequence from the outside of the guide sleeve inward. The skeleton dustproof ring, the first support ring, the first seal and the sliding bearing are respectively installed in the annular groove opened on the inner circumferential surface of the guide sleeve.

3. A hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load conditions according to claim 2, characterized in that, The first seal includes: The seal and the seal retaining ring are fitted together in the axial direction and then placed in the annular groove; A buffer seal is placed in an annular groove located inside the seal and the seal retaining ring.

4. A hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load conditions according to claim 3, characterized in that: The inner circumferential surface of the first support ring is provided with a spiral oil groove that has an oil storage function and can form an oil film.

5. A hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load conditions according to claim 3, characterized in that: The dustproof ring, seal, and buffer seal are all made of high-temperature resistant polyurethane material; the first support ring is made of modified reinforced glass fiber nylon material.

6. A hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load conditions according to claim 1, characterized in that: The second support ring in the second sealing assembly consists of support ring I and support ring II arranged at intervals; The left support ring I and support ring II, the second seal, and the right support ring I and support ring II are respectively installed in the annular grooves opened on the outer circumferential surface of the piston.

7. A hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load conditions according to claim 6, characterized in that: The piston is provided with a support ring I, a support ring II, a second seal, a support ring II and a support ring I arranged sequentially at intervals.

8. A hydraulic cylinder suitable for high-frequency reciprocating impact and large eccentric load conditions according to claim 6, characterized in that: The second sealing element is made of a high-hardness thermoplastic material; the support ring I is made of a phenolic resin material with a fabric reinforcement; and the support ring II is made of a modified reinforced glass fiber nylon material.

9. An engineering machinery, characterized in that: Includes the hydraulic cylinder as described in any one of claims 1 to 8, suitable for high-frequency reciprocating impact and large off-center load conditions.

10. An engineering machinery according to claim 9, characterized in that: The construction machinery includes excavators.

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