Rapid hydraulic oil cylinder

Abstract

The utility model discloses a quick hydraulic oil cylinder, which relates to the technical field of hydraulic oil cylinders, and is technically characterized by comprising a cylinder barrel and a piston rod, the end part of the piston rod is in sliding fit with the inner wall of the cylinder barrel through a sealing assembly, the sealing assembly comprises an annular support frame fixedly connected with the piston rod, and a fitting ring sleeve is fixedly sleeved outside the support frame; the attaching ring sleeve is made of elastic memory alloy and attached to the inner wall of the cylinder barrel in a sliding mode. The telescopic speed of the hydraulic oil cylinder can be increased.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic oil cylinder technical field especially is related to a quick hydraulic oil cylinder. BACKGROUND

[0002] As the core executive component of the hydraulic transmission system, the hydraulic oil cylinder is widely used in the fields of engineering machinery, industrial automation equipment, aerospace and heavy machinery by converting hydraulic energy into linear reciprocating mechanical energy. Its core structure is composed of a cylinder, a piston, a piston rod, a sealing device and a buffer device, and the working principle is based on Pascal's law: the pressure oil is provided by a hydraulic pump to push the piston to slide in the cylinder, thereby driving the piston rod to realize the extension and retraction movement. The hydraulic oil cylinder has the advantages of large output force, stable movement and strong carrying capacity, but its dynamic performance (such as response speed and extension efficiency) is limited by system design and mechanical structure.

[0003] The existing application CN201920284033.1 is a kind of hydraulic oil cylinder, however, the current hydraulic oil cylinder has significant limitations in dynamic performance, mainly manifested as low control response speed and slow extension speed, and the core reason can be attributed to the following problems: the cooperation gap between the piston rod and the inner wall of the cylinder directly affects the sealing and movement efficiency of the oil cylinder. If the gap is too large, the pressure oil will leak from the high-pressure side to the low-pressure side, reducing the effective action area; if the gap is too small, the friction resistance will increase. SUMMARY

[0004] To solve the above technical problems, the purpose of the utility model is to provide a kind of quick hydraulic oil cylinder, additional self-cooling function, improve the extension speed of hydraulic oil cylinder.

[0005] To achieve the above purpose, the utility model provides the following technical scheme:

[0006] A kind of quick hydraulic oil cylinder, including cylinder and piston rod, the end of the piston rod is slidably attached to the inner wall of the cylinder by a sealing assembly, the sealing assembly includes an annular support frame fixedly connected to the piston rod, a matching ring is fixedly attached to the outer surface of the support frame, the matching ring is made of elastic memory alloy and is slidably attached to the inner wall of the cylinder to improve the extension speed of the hydraulic oil cylinder.

[0007] Preferably, the outer wall of the matching ring is provided with a lubricating ring surface, and a plurality of micro-sized accommodating grooves are uniformly arranged on the lubricating ring surface, the micro-sized accommodating grooves are filled with graphite-based lubricating grease to realize automatic lubrication.

[0008] Preferably, the micro-sized accommodating grooves of the lubricating ring surface are arranged in a regular hexagonal honeycomb pattern, the groove depth of the accommodating grooves is 0.03-0.05mm and the groove width is 0.08-0.12mm to realize automatic lubrication.

[0009] Preferably, the support frame is made of spring steel, and a helical thread is arranged on the peripheral surface of the support frame to improve stability.

[0010] Preferably, the elastic memory alloy is a copper-based memory alloy or an iron-based memory alloy, and the specific material cost is low.

[0011] Preferably, the inner wall of the cylinder barrel is sprayed with a wear-resistant coating to improve wear resistance.

[0012] Preferably, the wear-resistant coating is an electroplated hard chromium layer.

[0013] The utility model has the following beneficial effects:

[0014] The fitting ring sleeve is made of elastic memory alloy and is slidably fitted with the inner wall of the cylinder barrel, the outer wall of the middle part is provided with a lubricating ring surface, the lubricating ring surface is uniformly provided with a micro accommodating groove and filled with graphite-based grease. The graphite-based grease has good lubricating performance, and can continuously provide lubrication for the contact surface of the fitting ring sleeve and the inner wall of the cylinder barrel during the extension and retraction of the piston rod, thereby reducing the friction between the two, reducing the resistance of the piston rod during movement, enabling the piston rod to extend and retract more smoothly, and further improving the extension and retraction speed of the hydraulic oil cylinder.

[0015] The micro accommodating groove is arranged in a regular hexagonal honeycomb shape, which can make the distribution of the lubricating grease more uniform and ensure that each part of the fitting ring sleeve and the inner wall of the cylinder barrel can be fully lubricated. At the same time, the groove depth of the accommodating groove is 0.03 - 0.05mm and the groove width is 0.08 - 0.12mm, and the reasonable size design can ensure that enough lubricating grease is accommodated, and can avoid that the accommodating groove is too large to affect the fitting degree of the fitting ring sleeve and the inner wall of the cylinder barrel. While effectively lubricating, the good sealing performance is maintained, and the extension and retraction speed of the hydraulic oil cylinder is improved.

[0016] The elastic memory alloy fitting ring sleeve is made of elastic memory alloy, and the elastic memory alloy has unique properties and can recover to the original state under certain conditions. During the operation of the hydraulic oil cylinder, even if the piston rod frequently extends and retracts to cause a certain wear or deformation of the fitting ring sleeve and the inner wall of the cylinder barrel, the characteristics of the elastic memory alloy can make it recover to the initial shape as much as possible, always maintain good fitting degree, reduce the problems of sealing and increased friction caused by wear, and ensure that the hydraulic oil cylinder can maintain a faster extension and retraction speed during long-term use.

[0017] Cylinder Inner Wall Wear-Resistant Coating: The inner wall of the cylinder is coated with a wear-resistant coating, which is an electroplated hard chrome layer. This electroplated hard chrome layer possesses high hardness, excellent wear resistance, and corrosion resistance, effectively resisting the friction and wear between the piston rod and the inner wall of the cylinder during piston rod extension and retraction, thus extending the cylinder's service life. Simultaneously, reducing wear on the inner wall of the cylinder maintains its flatness and dimensional accuracy, ensuring that the fit clearance between the piston rod and the inner wall remains within a reasonable range. This reduces increased friction and decreased sealing performance caused by wear, thereby guaranteeing the long-term stable and rapid extension and retraction performance of the hydraulic cylinder.

[0018] Support frame material: The support frame is made of spring steel, which has good elasticity and strength. During the piston rod's extension and retraction, the support frame provides stable support for the contact ring, ensuring a good fit between the contact ring and the cylinder inner wall. Simultaneously, the elasticity of spring steel allows the support frame to deform elastically under pressure and return to its original shape after the pressure is released. This characteristic helps reduce jamming during piston rod extension and retraction, making the piston rod move more smoothly and thus increasing the extension and retraction speed of the hydraulic cylinder.

[0019] Spiral texture on the circumference of the support frame: The spiral texture on the circumference of the support frame increases the friction between the support frame and the fitting ring, making the fitting ring more firmly fixed to the support frame and preventing displacement or loosening of the fitting ring during piston rod extension and retraction, thus ensuring the overall stability of the sealing assembly. A stable sealing assembly can better perform its sealing and lubrication functions, reduce energy loss, and facilitate rapid extension and retraction of the hydraulic cylinder. Attached Figure Description

[0020] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a cross-sectional view of the first embodiment of the present invention.

[0022] Figure 2 This is a schematic diagram of the outer wall of the fitting ring according to the second embodiment of the present invention.

[0023] In the diagram: 1. Cylinder; 2. Piston rod; 301. Support frame; 302. Fitting ring; 401. Lubricating ring surface; 5. Wear-resistant coating. Detailed Implementation

[0024] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative efforts fall within the scope of the present application.

[0025] The first embodiment

[0026] As shown in the drawings, Figure 1 A quick hydraulic cylinder, comprising a cylinder barrel 1 and a piston rod 2, the end of the piston rod 2 is in sliding fit with the inner wall of the cylinder barrel 1 through a sealing assembly, the sealing assembly comprises an annular support frame 301 fixedly connected with the piston rod 2, and a fit ring 302 is fixedly sleeved outside the support frame 301, the fit ring 302 is made of elastic memory alloy and is in sliding fit with the inner wall of the cylinder barrel 1.

[0027] As shown in the drawings, Figure 1 The fit ring 302 is made of elastic memory alloy (such as copper-based memory alloy or iron-based memory alloy), and by virtue of the unique shape memory effect of the elastic memory alloy, it can maintain good fit with the inner wall of the cylinder barrel 1 at normal temperature or under specific conditions. When the piston rod 2 is in extension and retraction movement in the cylinder barrel 1, the fit ring 302 is always in sliding fit with the inner wall of the cylinder barrel 1, thereby playing a sealing role, preventing hydraulic oil leakage, ensuring the stability of the pressure in the hydraulic system, and providing a basic condition for the quick extension and retraction of the piston rod 2. The support frame 301 is annular and fixedly connected with the piston rod 2, and it provides stable support for the fit ring 302. The support frame 301 is made of spring steel, which has good elasticity. When the piston rod 2 is subjected to certain external force during extension and retraction, the support frame 301 can be elastically deformed to buffer part of the force, thereby avoiding excessive impact on the fit ring 302 and the inner wall of the cylinder barrel 1. At the same time, the spiral threads provided on the peripheral surface of the support frame 301 increase the friction between the fit ring 302 and the support frame 301, so that the fit ring 302 is more firmly fixed on the support frame 301, preventing the fit ring 302 from being displaced or loosened during movement of the piston rod 2, ensuring the stability of the overall structure of the sealing assembly, and further ensuring the sealing effect and normal movement of the piston rod 2.

[0028] As shown in the drawings, Figure 1As shown, the inner wall of the cylinder barrel 1 is sprayed with a hard chromium plating wear-resistant coating 5. During the frequent extension and retraction of the piston rod 2, the fitting ring 302 will rub against the inner wall of the cylinder barrel 1. The hard chromium plating has high hardness and good wear resistance, which can effectively resist such friction and reduce the wear of the inner wall of the cylinder barrel 1. At the same time, it also has certain corrosion resistance, which can prevent impurities or other chemical substances in the hydraulic oil from corroding the inner wall of the cylinder barrel 1, thereby prolonging the service life of the cylinder barrel 1, maintaining the flatness and dimensional accuracy of the inner wall of the cylinder barrel 1, ensuring that the fitting clearance between the fitting ring 302 and the inner wall of the cylinder barrel 1 is always within a reasonable range, reducing the increase in friction and the decline in sealing performance caused by wear, and enabling the piston rod 2 to extend and retract quickly in a relatively stable low-friction environment, thereby improving the extension and retraction speed and working efficiency of the hydraulic oil cylinder.

[0029] Second embodiment

[0030] As shown in the drawings, the outer wall of the fitting ring 302 is provided with a lubricating ring surface 401 in the middle, and a plurality of micro accommodating grooves are uniformly arranged on the lubricating ring surface 401. Figure 2 During the operation of the hydraulic oil cylinder, when the piston rod 2 drives the fitting ring 302 to slide relative to the inner wall of the cylinder barrel 1, the graphite-based lubricating grease will form a lubricating film between the contact surfaces of the two. This lubricating film can significantly reduce the friction coefficient between the fitting ring 302 and the inner wall of the cylinder barrel 1, reduce the frictional resistance, so that the piston rod 2 can move more smoothly and quickly during extension and retraction, thereby improving the extension and retraction speed of the hydraulic oil cylinder.

[0031] As shown in the drawings, the micro accommodating grooves of the lubricating ring surface 401 are arranged in a regular hexagonal honeycomb shape, the groove depth of the accommodating grooves is 0.03-0.05mm, and the groove width is 0.08-0.12mm. Figure 2 This arrangement has high space utilization and uniformity. It can make the lubricating grease more evenly distributed on the lubricating ring surface 401, ensuring that all parts of the fitting ring 302 in contact with the inner wall of the cylinder barrel 1 are fully lubricated. At the same time, the regular hexagonal structure has good mechanical properties and can withstand the pressure generated during the extension and retraction of the piston rod 2 to a certain extent, ensuring the stability of the accommodating groove structure and preventing damage due to excessive local stress, thereby continuously and stably playing a lubricating role.

[0032] The above is only a specific embodiment of the present application, but the technical features of the present application are not limited to this. Any simple change, equivalent replacement or modification made on the basis of the present application to solve basically the same technical problem and achieve basically the same technical effect is also covered by the protection scope of the present application.

Claims

1. A quick hydraulic cylinder comprising a cylinder barrel (1) and a piston rod (2), characterized in that: The end of the piston rod (2) is in sliding fit with the inner wall of the cylinder (1) through a sealing assembly, the sealing assembly comprises an annular support frame (301) fixedly connected with the piston rod (2), an adhering ring (302) is fixedly sleeved outside the support frame (301), the adhering ring (302) is made of elastic memory alloy and is in sliding fit with the inner wall of the cylinder (1).

2. A quick hydraulic cylinder according to claim 1, characterized in that: A lubricating ring surface (401) is arranged in the middle of the outer wall of the adhering ring (302), a plurality of micro accommodating grooves are evenly arranged on the lubricating ring surface (401), and the micro accommodating grooves are filled with graphite-based lubricating grease.

3. A quick hydraulic cylinder according to claim 2, characterized in that: The micro accommodating grooves of the lubricating ring surface (401) are arranged in a hexagonal honeycomb shape, the groove depth of the accommodating grooves is 0.03-0.05mm, and the groove width is 0.08-0.12mm.

4. The quick hydraulic cylinder according to claim 1, wherein: The support frame (301) is made of spring steel, and a helical thread is arranged on the circumferential surface of the support frame (301).

5. The quick hydraulic cylinder of claim 1, wherein: The elastic memory alloy is copper-based memory alloy or iron-based memory alloy.

6. A quick hydraulic cylinder according to claim 1, characterized in that: The inner wall of the cylinder (1) is sprayed with a wear-resistant coating (5).

7. A quick hydraulic ram as claimed in claim 6 wherein: The wear-resistant coating (5) is an electroplated hard chromium layer.

Images