Double-cylinder flange type connecting hydraulic cylinder

Abstract

A kind of double cylinder flange connection hydraulic cylinder, including using flange connection cylinder barrel I and cylinder barrel II, piston rod is provided in cylinder barrel I and cylinder barrel II, the end of piston rod connected with piston is arranged in cylinder barrel I, the end of cylinder barrel II is equipped with the gland of piston rod cooperation, further including guide sleeve, guide sleeve is arranged at the junction of cylinder barrel I and cylinder barrel II, guide sleeve is fixed by cylinder barrel I and cylinder barrel II together.The double cylinder flange connection hydraulic cylinder of the utility model, by flange connection two-part cylinder barrel, and guide sleeve is embedded in the oil cylinder, not only convenient to disassemble, but also effectively reduce the influence of vertical oil cylinder side load to guide sleeve part, reduce stress concentration, meet the development trend of small tonnage truck crane and all terrain crane vertical oil cylinder, improve the reliability and maintainability of complete machine, and solve the problem such as vertical oil cylinder in market feedback guide sleeve corrosion, inconvenient thread disassembly etc., greatly improve the performance of vertical oil cylinder.

Description

Technical Field

[0001] This utility model relates to the field of engineering machinery technology, specifically a double-cylinder flange-connected hydraulic cylinder. Background Technology

[0002] The vertical cylinders used in truck cranes and all-terrain cranes play a crucial role in supporting the entire vehicle off the ground and achieving precise lifting. All the lifted weight is ultimately distributed among the four vertical cylinders, resulting in a high load-bearing capacity. However, because these cylinders are in contact with the ground for extended periods, they are significantly affected by the working environment. In coastal areas, for example, piston rods and guide sleeves without special treatment are prone to corrosion, affecting normal use. Furthermore, the force on the vertical cylinders during crane operation is not limited to the Z-axis; lateral loads are generated when the lifted load rotates or stops, constantly testing the performance of the vertical cylinders. According to market feedback on vertical cylinders in recent years, problems with the guide sleeve end are particularly prominent, including insufficient thread strength, thread corrosion, and dustproof failure. Aside from a few cases due to early design flaws, most are closely related to the actual operating conditions of the cylinders and user habits. Current market competition is no longer simply about functionality or price, but about product reliability. Modern designs must have a certain margin of safety; overly ambitious designs may prove insufficient in the later stages of the product's lifespan. Therefore, we might as well sacrifice a portion of the total length and use it as the distance for the vertical cylinder spacer, dispersing the stress concentration in the guide sleeve under lateral loads. This would also incur a slight increase in cost, allowing for a double dustproof structure to reduce corrosion. Currently, in most vertical cylinders, the guide sleeve is placed on the side closest to the piston rod ball head. The threaded structure's anti-loosening and assembly issues affect efficiency, and if a problem arises with the cylinder on-site, disassembly is difficult for service personnel. Furthermore, if the threads are burnt out, repairs will be severely hampered. Summary of the Invention

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a simple and effective double-cylinder flange-type hydraulic cylinder.

[0004] This utility model is achieved by the following technical solution: a double-cylinder flange-connected hydraulic cylinder, including cylinder I and cylinder II, wherein the connection between cylinder I and cylinder II is a flange connection, a piston rod is provided inside cylinder I and cylinder II, one end of the piston rod connected to the piston is located inside cylinder I, and a pressure cap for cooperating with the piston rod is provided at the end of cylinder II, and a guide sleeve is also provided, wherein the guide sleeve is located at the connection between cylinder I and cylinder II, and the guide sleeve is fixed by cylinder I and cylinder II together.

[0005] Furthermore, the connection between cylinder I and cylinder II is made by several sets of evenly distributed nuts and bolts.

[0006] Eight sets of nuts and bolts are evenly distributed at the connection between cylinder I and cylinder II.

[0007] A sealing ring is provided between the gland and the piston rod on the inner wall of cylinder II.

[0008] The outer wall of the guide sleeve is connected to cylinder I and cylinder II by a limiting connection.

[0009] The outer wall of the guide sleeve is provided with a protrusion, and the connection between cylinder I and cylinder II is provided with a groove that cooperates with the protrusion.

[0010] The guide sleeve is provided with sealing rings between itself and the piston rod, cylinder I and cylinder II.

[0011] This utility model has the following advantages: The double-cylinder flange-connected hydraulic cylinder of this utility model connects the two cylinder parts through the flange and embeds the guide sleeve inside the cylinder. This not only facilitates disassembly, but also effectively reduces the impact of the side load of the vertical cylinder on the guide sleeve, reduces stress concentration, meets the development trend of vertical cylinders for small and medium tonnage truck cranes and all-terrain cranes, improves the overall reliability and maintainability of the machine, and solves the problems of guide sleeve corrosion and inconvenient thread disassembly and assembly reported in the market for vertical cylinders, greatly improving the performance of vertical cylinders. Attached Figure Description

[0012] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0013] In the attached diagram:

[0014] Figure 1 This is a schematic diagram of the internal structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the end face of this utility model.

[0016] In the diagram: 1. Cylinder I, 2. Piston, 3. Piston rod, 4. Guide sleeve, 5. Nut, 6. Bolt, 7. Cylinder II, 8. Gland.

[0017] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0019] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0020] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0021] like Figures 1 to 2 The illustrated hydraulic cylinder with a double-cylinder flange connection includes cylinder I1 and cylinder II7. The connection between cylinder I1 and cylinder II7 is a flange connection. A piston rod 3 is provided inside cylinder I1 and cylinder II7. One end of the piston rod 3, which is connected to a piston 2, is located inside cylinder I1. A pressure cap 8, which is used in conjunction with the piston rod 3, is provided at the end of cylinder II7. The cylinder also includes a guide sleeve 4, which is located at the connection between cylinder I1 and cylinder II7 and is fixed together by cylinder I1 and cylinder II7. This utility model discloses a double-cylinder flange-connected hydraulic cylinder, comprising cylinder I, cylinder II, piston rod, pressure cap, and guide sleeve. The two cylinder parts, cylinder I and cylinder II, allow for adjustment of their length to fit the installation distance of the main machine, optimize cylinder stress, distribute some lateral loads, reduce stress concentration in the guide sleeve, and enhance the stability of the sealing system. The two cylinder parts are connected by a flange (circular flange), ensuring stable stress distribution and easy assembly / disassembly. The guide sleeve is fitted into the connection between cylinder I and cylinder II via the flange, facilitating replacement and maintenance. The guide sleeve, located inside the cylinder, significantly improves sealing performance and lateral load resistance. Furthermore, the pressure cap is located at the end of cylinder II, allowing for separate assembly of the guide sleeve and pressure cap. This dual-cylinder and guide sleeve / pressure cap separation method enhances the cylinder's lateral load resistance, effectively solving the problem of weak lateral load resistance and inconvenient maintenance in vertical hydraulic cylinders of small and medium-tonnage cranes.

[0022] like Figures 1 to 2 The illustrated hydraulic cylinder features a double-cylinder flange connection. Cylinder I1 and Cylinder II7 are connected at their joints by several sets of evenly distributed nuts 5 and bolts 6. Eight sets of nuts 5 and bolts 6 are evenly distributed at the connection between Cylinder I1 and Cylinder II7. This invention utilizes a circular flange connection between the two cylinders, ensuring stable force distribution and convenient assembly and disassembly. Furthermore, both cylinders are threadless, facilitating machining and improving assembly efficiency. The circular flange allows for the removal of nuts and direct connection to the threaded holes in the main unit's square cavity, simplifying disassembly and maintenance and enhancing product reliability.

[0023] like Figures 1 to 2 The illustrated hydraulic cylinder features a double-cylinder flange connection. Sealing rings are provided between the pressure cap 8 and the piston rod 3 on the inner wall of cylinder II 7. Sealing rings are also provided between the guide sleeve 4 and the piston rod 3, cylinder I 1, and cylinder II 7. This invention's double dustproof structure provides better dust and water protection; furthermore, the built-in guide sleeve and double dustproof structure enhance the cylinder's dust and water resistance.

[0024] like Figures 1 to 2 The illustrated hydraulic cylinder features a double-cylinder flange connection. The outer wall of the guide sleeve 4 is connected to cylinders I1 and II7 via a limiting connection. The outer wall of the guide sleeve 4 has a protrusion, and the connection between cylinders I1 and II7 has a groove that mates with the protrusion. The guide sleeve of this invention is positioned inside the cylinder and fixed by a flange. The flange and guide sleeve are connected via a groove and a protrusion, which facilitates installation and ensures reliable limiting.

[0025] This utility model relates to a double-cylinder flange-type hydraulic cylinder. In use, cylinder I and cylinder II are first fitted with guide sleeves inside the cylinders using eight sets of evenly distributed bolts and nuts. When the assembly and pressure test are completed and the cylinder is brought to the host site, the nuts can be removed, and the cylinder can be connected to the host's square cavity using bolts. At the same time, by selecting cylinder II of different lengths, the installation distance of the host can be met. Compared with the general vertical cylinder structure with the guide sleeve placed at the end, this structure also has a certain dustproof and side load resistance capability. Firstly, regarding dust prevention, the guide sleeve embedded inside the cylinder does not directly contact the outside environment, and both the guide sleeve and the pressure cap have their own sealing systems. Different models of the two dust prevention systems can be selected as needed to increase the dust prevention effect. Secondly, regarding the resistance to lateral loads, when the piston rod forms a certain angle with the vertical direction, the pressure cap is the first part to bear the force and plays a certain supporting role. Furthermore, the slight deformation of cylinder II will not affect the condition of the sealing ring. At the same time, the size of the angle decreases as the height increases, and the force distributed on the guide sleeve is much smaller than that on the vertical cylinder where the guide sleeve is placed at the end. This ensures the stability of the seal of the guide sleeve and enhances the sealing performance of the vertical cylinder.

[0026] Existing vertical cylinder guide sleeves are generally fixed to one side of the cylinder barrel. When the side load is large, the guide sleeve area is stressed and prone to deformation. At the same time, relying on threaded connections, the thread strength is also at risk. The double-cylinder flange-connected hydraulic cylinder of this utility model places the guide sleeve inside the hydraulic cylinder and connects it through a flange. It also adds a cylinder barrel and a dustproof cover, which can effectively reduce the impact of the side load of the vertical cylinder on the guide sleeve part, reduce stress concentration, save assembly efficiency in terms of process, and has more stable strength. The added cylinder barrel and a dustproof cover can effectively distribute the side load and enhance the dustproof effect.

[0027] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0028] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this invention and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.

[0029] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A double-cylinder flange-connected hydraulic cylinder, characterized in that: It includes cylinder I (1) and cylinder II (7), the connection between cylinder I (1) and cylinder II (7) is flanged, a piston rod (3) is provided in cylinder I (1) and cylinder II (7), one end of the piston rod (3) connected to the piston (2) is set in cylinder I (1), and a pressure cap (8) for the piston rod (3) is provided at the end of cylinder II (7). It also includes a guide sleeve (4), the guide sleeve (4) is set at the connection between cylinder I (1) and cylinder II (7), and the guide sleeve (4) is fixed by cylinder I (1) and cylinder II (7).

2. The double-cylinder flange-connected hydraulic cylinder as described in claim 1, characterized in that: The cylinder I (1) and cylinder II (7) are connected together by several sets of evenly distributed nuts (5) and bolts (6).

3. A double-cylinder flange-connected hydraulic cylinder as described in claim 2, characterized in that: Eight sets of nuts (5) and bolts (6) are evenly distributed at the connection between cylinder I (1) and cylinder II (7).

4. A double-cylinder flange-type hydraulic cylinder as described in claim 1, characterized in that: A sealing ring is provided between the pressure cap (8) and the piston rod (3) on the inner wall of cylinder II (7).

5. A double-cylinder flange-connected hydraulic cylinder as described in claim 1, characterized in that: The outer wall of the guide sleeve (4) is connected to the cylinder I (1) and cylinder II (7) by a limiting connection.

6. A double-cylinder flange-connected hydraulic cylinder as described in claim 5, characterized in that: The outer wall of the guide sleeve (4) is provided with a protrusion, and the connection between the cylinder I (1) and the cylinder II (7) is provided with a groove that cooperates with the protrusion.

7. A double-cylinder flange-connected hydraulic cylinder as described in claim 1, characterized in that: The guide sleeve (4) is provided with sealing rings between itself and the piston rod (3), cylinder I (1) and cylinder II (7).

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