Oil cylinder lubricating and cooling structure applied to high-temperature and high-frequency working conditions and oil cylinder

Abstract

The oil cylinder lubricating and cooling structure comprises the oil cylinder, an annular cavity is formed between a guide sleeve and a piston rod of the oil cylinder, a valve block is arranged on the guide sleeve, the valve block is communicated with a rod cavity, a rodless cavity and the annular cavity at the same time, a shuttle valve is arranged in the valve block, and the shuttle valve is connected with the piston rod. Oil enters the rod cavity or the rodless cavity, the shuttle valve is opened after the oil enters the valve block, the oil flows into the annular cavity, and the annular cavity is located between the sealing assemblies on the inner side of the guide sleeve. By means of the mode, according to the oil cylinder lubricating and cooling structure applied to the high-temperature and high-frequency working conditions and the oil cylinder, oil in the annular cavity can well lubricate and cool the main sealing ring, the service life of the sealing ring is prolonged, and the structure is simple.

Description

Technical Field

[0001] The utility model relates to the field of oil cylinders, in particular to an oil cylinder lubrication cooling structure and an oil cylinder applied to high-temperature and high-frequency working conditions. Background Art

[0002] In industrial production and actual engineering applications, the application scope of oil cylinders in high-temperature environments and with increasingly higher working frequencies is becoming wider and wider, and the demand is also increasing. At the same time, more than 1 / 3 of the energy input into mechanical equipment is consumed in friction loss, and the economic losses caused by the failure of seals under high-temperature and high-frequency operation of the oil cylinder also account for a relatively large proportion. As a power component, in order to prevent oil leakage and normal operation of the oil cylinder, the conventional oil cylinder seal design is to arrange several annular seals and guide rings that play the main pressure-bearing role. However, when the oil cylinder works at a high frequency and a high working environment, the seals are easily sintered, worn and damaged, which leads to oil leakage and failure of the oil cylinder.

[0003] The existing lubrication mainly relies on the oil film attached to the cylinder piston rod when it extends, and then lubricates the seal ring. However, in some working conditions with large side loads and harsh working environments, multiple dust rings and rod seals need to be arranged. However, with the role of the main seal ring, especially in some special working conditions, multiple main seals need to be arranged. The oil film decreases from the rodless cavity to the last main seal ring, and the lubrication effect decreases successively. Therefore, the existing cylinder will replace the seal as a whole after the working time reaches a certain period. In addition, the current measure for high-temperature working conditions is to use a seal ring with higher high-temperature resistance. However, this kind of seal ring is expensive and there are few seal rings that can achieve this performance in China. The seal rings available for selection are very limited. Moreover, this structure is classic, simple and has low processing difficulty, making it the first choice for engineers designing cylinder lubrication and cooling solutions.

[0004] Conventional seal lubrication usually uses the oil film attached to the piston rod to lubricate the seal, but this lubrication measure can only be used in conventional working conditions. For some harsh working conditions, multiple seals need to be added to prevent oil cylinder leakage, but the effect of oil film lubrication can only be applied to the first main seal, and the subsequent seals cannot be lubricated. In addition, due to the high-frequency movement of the piston rod, the dry friction between the seal and the piston rod will generate heat, which may sinter or even damage the seal, greatly reducing the service life of the seal. In a dusty working environment, the dust ring cannot completely scrape off the dust, and some dust will enter the inner side of the oil cylinder and damage the seal. Larger particles may scratch the piston rod and cause oil cylinder leakage. Summary of the invention

[0005] The main technical problem solved by the utility model is to provide an oil cylinder lubrication cooling structure and an oil cylinder applied to high temperature and high frequency working conditions. The oil in the annular cavity can lubricate and cool the main sealing ring well, thereby increasing the service life of the sealing ring and having a simple structure.

[0006] In order to solve the above technical problems, a technical solution adopted by the utility model is: to provide an oil cylinder lubrication and cooling structure applied to high-temperature and high-frequency working conditions, including an oil cylinder, an annular cavity is formed between the guide sleeve and the piston rod of the oil cylinder, a valve block is provided on the guide sleeve, and the valve block is connected with the rod cavity, the rodless cavity and the annular cavity at the same time, a shuttle valve is provided in the valve block, and oil enters the rod cavity or the rodless cavity. After the oil enters the valve block, the shuttle valve opens and flows into the annular cavity, and the annular cavity is located between the sealing components on the inner side of the guide sleeve.

[0007] In a preferred embodiment of the utility model, chamber A, chamber B and chamber C are formed between the shuttle valve and the valve block, the chamber A is connected to the rodless chamber, the chamber B is connected to the rod chamber, and the annular chamber is connected to the chamber C.

[0008] In a preferred embodiment of the utility model, a flow channel is provided on the guide sleeve, and the flow channel connects the annular cavity with the cavity C of the valve block.

[0009] In a preferred embodiment of the present invention, the cavity A is directly connected to the rodless cavity through an oil pipe, and the cavity B is connected to the rod cavity through a guide sleeve.

[0010] In a preferred embodiment of the present invention, after the oil in the rodless chamber enters chamber A, the slider of the shuttle valve moves toward chamber B, thereby allowing the oil to flow into chamber C through chamber A. After the oil in the rod chamber enters chamber B, the slider of the shuttle valve moves toward chamber A, thereby allowing the oil to flow into chamber C through chamber B.

[0011] In a preferred embodiment of the present invention, a throttling screw is further provided on the valve block, and the throttling screw is located at the outlet end of the cavity C.

[0012] In a preferred embodiment of the utility model, the guide sleeve is further provided with an oil drain hole, and the oil drain hole is communicated with the flow channel.

[0013] In a preferred embodiment of the present invention, the sealing assembly includes a first sealing ring and a second sealing ring, and the annular cavity is located between the first sealing ring and the second sealing ring.

[0014] In a preferred embodiment of the present invention, a dust ring is provided on the left side of the first sealing ring.

[0015] In order to solve the above technical problems, another technical solution adopted by the present utility model is: to provide an oil cylinder, comprising the oil cylinder lubrication and cooling structure as claimed in the claims.

[0016] The beneficial effects of the utility model are as follows: the utility model is applied to the oil cylinder lubrication cooling structure and the oil cylinder under high temperature and high frequency working conditions. Through the practical combination of the annular cavity and the shuttle valve, the hydraulic oil will always fill the annular cavity following the expansion and contraction of the oil cylinder, thereby realizing cooling and lubrication of the sealing component and ensuring the use effect of the sealing component.

[0017] The utility model is applied to the oil cylinder lubrication cooling structure and the oil cylinder under high temperature and high frequency working conditions. The oil drain hole on the guide sleeve can discharge the hydraulic oil in the guide sleeve and take away the dust entering the guide sleeve, so as to prevent the dust from accumulating and entering the sealing ring, thereby preventing the sealing component and the piston rod from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative work, among which:

[0019] Figure 1 It is a structural schematic diagram of a preferred embodiment of the oil cylinder lubrication and cooling structure of the utility model applied to high temperature and high frequency working conditions;

[0020] Figure 2 yes Figure 1 Schematic diagram of the local structure;

[0021] Figure 3 yes Figure 1 A partial cross-sectional view of

[0022] The markings of the components in the accompanying drawings are as follows: 1. guide sleeve, 2. piston rod, 3. annular chamber, 4. dust ring, 5. first sealing ring, 6. second sealing ring, 7. valve block, 8. shuttle valve, 9. oil drain hole, 10. oil pipe, 11. throttling screw, 12. flow channel. DETAILED DESCRIPTION

[0023] The technical scheme in the embodiment of the utility model will be described clearly and completely below. The structure, proportion, size, etc. illustrated in the drawings of this specification are only used to match the content disclosed in the specification, so that people familiar with this technology can understand and read, and are not used to limit the limiting conditions that can be implemented in the utility model, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size, without affecting the effect that can be produced by the utility model and the purpose that can be achieved, should still fall within the scope of the technical content disclosed in the utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and so on quoted in this specification are only for the convenience of narration, and are not used to limit the scope that can be implemented. The change or adjustment of its relative relationship should also be regarded as the scope that can be implemented in the utility model without substantially changing the technical content.

[0024] See also Figures 1 to 3 , a cylinder lubrication cooling structure and a cylinder applied to high temperature and high frequency working conditions, including a cylinder. The cylinder can be an existing cylinder, and the specific structure is not repeated here. An annular cavity 3 is formed between the guide sleeve 1 and the piston rod 2 of the cylinder. A sealing assembly that cooperates with the piston rod 2 is provided on the inner side of the guide sleeve 1. The sealing assembly generally takes the form of a dust ring 4, a first sealing ring 5, a guide ring, a second sealing ring 6, a guide ring, a buffer ring and a guide ring. Other sealing combinations may also be used. At least it is necessary to ensure that the annular cavity 3 is located between the first sealing ring and the second sealing ring 6.

[0025] The guide sleeve 1 is provided with a valve block 7, which is connected with the rod chamber, the rodless chamber and the annular chamber 3 at the same time. A shuttle valve 8 is provided in the valve block 7, and oil enters the rod chamber or the rodless chamber. After the oil enters the valve block 7, the shuttle valve 8 is opened and flows into the annular chamber 3. Chamber A, chamber B and chamber C are formed between the shuttle valve 8 and the valve block 7. Chamber A is connected with the rodless chamber, chamber B is connected with the rod chamber, and the annular chamber 3 is connected with chamber C. A flow channel 12 is provided on the guide sleeve 1, and the flow channel 12 connects the annular chamber 3 with chamber C of the valve block 7. A throttling screw 11 is also provided on the valve block 7. The throttling screw 11 is located at the outlet end of chamber C. By replacing the throttling screw 11, the oil flow rate of chamber C entering the annular chamber 3 can be controlled. Chamber A is directly connected to the rodless chamber through the oil pipe 10, and chamber B is connected with the rod chamber through the guide sleeve 1. After the oil in the rodless chamber enters chamber A, the slider of the shuttle valve 8 moves toward chamber B, so that the oil flows into chamber C through chamber A. After the oil in the rod chamber enters chamber B, the slider of the shuttle valve 8 moves toward chamber A, so that the oil flows into chamber C through chamber B. Due to the limitations of oil film lubrication, it is difficult to have an oil film to lubricate the surfaces of the main seal ring 1, the main seal ring 2 and the piston rod 2. Due to the high-frequency action of the oil cylinder, only dry friction can occur between the seal ring and the piston rod 2, which greatly reduces the service life of the seal ring. The oil entering the rodless chamber or the rod chamber is sent to the annular chamber 3 through the guide sleeve 1, the valve block 7 and the shuttle valve 8, and the annular chamber 3 is just between the first seal ring 5, the second seal ring 6 and the piston rod 2. The oil can fully lubricate the three and reduce the friction between the first seal ring 5, the second seal ring 6 and the piston rod 2.

[0026] When the piston rod 2 extends, part of the oil enters the rodless chamber to push the piston forward to complete the extension of the piston rod 2, and part of the oil enters chamber A through the oil pipe 10. The built-in slider of the shuttle valve 8 moves toward chamber B, so that chamber A is connected to chamber C. Part of the oil in chamber C enters the annular chamber 3, and then lubricates the first sealing ring 5 and the second sealing ring 6 to complete the lubrication action. When the piston rod 2 retracts, the hydraulic oil pushes the piston to the right to complete the retraction of the piston rod 2. The hydraulic oil enters chamber B through the guide sleeve 1, and the built-in slider of the shuttle valve 8 moves toward chamber A. Chamber B is connected to chamber C, and the oil enters the annular chamber 3 to complete the lubrication action. During lubrication, the conversion of the oil will take away part of the heat generated by the dry friction between the main sealing ring and the piston rod 2, thereby better protecting the sealing ring.

[0027] The guide sleeve 1 is also provided with an oil drain hole 9, which is connected to the flow channel 12. The oil drain hole 9 is blocked by a plug when the oil cylinder is working. Dust may enter the guide sleeve 1 during the operation of the oil cylinder. Since the annular cavity 3 is filled with hydraulic oil, dust will accumulate in the annular cavity 3. When the oil cylinder is not working, the oil drain hole 9 can be opened to discharge the hydraulic oil in the annular cavity 3. The dust is discharged from the oil cylinder along with the hydraulic oil, so as to better protect the piston rod 2 and the seal.

[0028] Different from the prior art, the utility model is applied to the oil cylinder lubrication cooling structure and the oil cylinder under high temperature and high frequency working conditions. The oil in the annular cavity can well lubricate and cool the main sealing ring, thereby increasing the service life of the sealing ring and having a simple structure.

[0029] The above schematically describes the present invention and its implementation methods, which are not restrictive. The drawings show only one implementation method of the present invention, and the actual structure is not limited thereto. Therefore, if ordinary technicians in this field are inspired by it and design structural methods and embodiments similar to the technical solution without creativity without departing from the purpose of the present invention, they should all fall within the protection scope of the present invention.

Claims

1. A cylinder lubrication and cooling structure for use in high-temperature and high-frequency working conditions, comprising a cylinder, wherein an annular cavity (3) is formed between a guide sleeve (1) and a piston rod (2) of the cylinder, and wherein: The guide sleeve (1) is provided with a valve block (7), the valve block (7) being connected to the rod chamber, the rodless chamber and the annular chamber (3) at the same time, the valve block (7) being provided with a shuttle valve (8), the rod chamber or the rodless chamber being supplied with oil, the oil entering the valve block (7) opens the shuttle valve (8) and flows into the annular chamber (3), the annular chamber (3) being located between the sealing components on the inner side of the guide sleeve (1).

2. The oil cylinder lubrication and cooling structure for high temperature and high frequency working conditions according to claim 1 is characterized in that: A cavity A, a cavity B and a cavity C are formed between the shuttle valve (8) and the valve block (7); the cavity A is in communication with the rodless cavity, the cavity B is in communication with the rod cavity, and the annular cavity (3) is in communication with the cavity C.

3. The oil cylinder lubrication and cooling structure for high temperature and high frequency working conditions according to claim 2 is characterized in that: The guide sleeve (1) is provided with a flow channel (12), and the flow channel (12) connects the annular cavity (3) with the cavity C of the valve block (7).

4. The oil cylinder lubrication and cooling structure for high temperature and high frequency working conditions according to claim 3 is characterized in that: The cavity A is directly connected to the rodless cavity through an oil pipe (10), and the cavity B is connected to the rod cavity through a guide sleeve (1).

5. The oil cylinder lubrication and cooling structure for high temperature and high frequency working conditions according to any one of claims 2 to 4, characterized in that: After the oil in the rodless chamber enters chamber A, the slider of the shuttle valve (8) moves toward chamber B, so that the oil flows into chamber C through chamber A. After the oil in the rod chamber enters chamber B, the slider of the shuttle valve (8) moves toward chamber A, so that the oil flows into chamber C through chamber B.

6. The oil cylinder lubrication and cooling structure for high temperature and high frequency working conditions according to claim 5 is characterized in that: The valve block (7) is also provided with a throttling screw (11), and the throttling screw (11) is located at the outlet end of the cavity C.

7. The oil cylinder lubrication and cooling structure for high temperature and high frequency working conditions according to claim 1 is characterized in that: The guide sleeve (1) is also provided with an oil drain hole (9), and the oil drain hole (9) is connected to the flow channel (12).

8. The oil cylinder lubrication and cooling structure for high temperature and high frequency working conditions according to claim 7 is characterized in that: The sealing assembly comprises a first sealing ring (5) and a second sealing ring (6), and the annular cavity (3) is located between the first sealing ring (5) and the second sealing ring (6).

9. The oil cylinder lubrication and cooling structure for high temperature and high frequency working conditions according to claim 8, characterized in that: A dust ring (4) is provided on the left side of the first sealing ring (5).

10. An oil cylinder, characterized in that: It comprises the oil cylinder lubrication and cooling structure as described in any one of claims 1-9.

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