Pull rod special for long stroke oil cylinder

Abstract

The application relates to the technical field of oil cylinders, in particular to a long-stroke oil cylinder special pull rod, which comprises a pull rod main body and two assembly nuts, the two ends of the pull rod main body are respectively provided with threaded sections, the two assembly nuts are respectively threaded assembled on the threaded sections, one or two supporting blocks are detachably assembled on the pull rod main body, the pull rod main body penetrates through the supporting blocks, the inner side of the supporting block is provided with a concave arc surface, the concave arc surface is used for abutting the outer peripheral wall of an oil cylinder body, and the position of the supporting block equally divides the length of the pull rod main body. The long-stroke oil cylinder special pull rod has the advantages that one or two supporting blocks are added between the relatively long pull rod main body and the outer peripheral wall of the oil cylinder body, then the relatively long pull rod main body has multiple (three or four) supporting points, when the pull rod main body is impacted or extruded by external force, the pull rod main body is not prone to bending and deformation, and the overall structural strength and service life of the oil cylinder are obviously improved.

Description

Technical Field

[0001] This application relates to the field of hydraulic cylinder technology, and in particular to a tie rod specifically designed for long-stroke hydraulic cylinders. Background Technology

[0002] A tie-rod hydraulic cylinder is a hydraulic device that connects the cylinder barrel to the front and rear covers via four tie rods, hence it is also called a four-rod hydraulic cylinder. Its structural features include: the front and rear covers are fixed by four tie rods, forming a modular structure; it is suitable for low-pressure or frequently used operating conditions and is easy to maintain.

[0003] For example, Chinese patent application number CN202021093479.5 discloses a four-link hydraulic cylinder, including a cylinder body, with a front end plate and a rear end plate fixedly connected to both ends of the cylinder body by link rods; a piston rod is sleeved between the cylinder body and the front end plate; a through hole is opened at the center of the rear end plate; a limiting annular groove is opened on the circumferential side of the through hole; a threaded rod is rotatably connected to the circumferential side of the limiting annular groove and located between the rear end plate and the cylinder body.

[0004] Regarding the aforementioned related technologies, the inventors believe that the following defects exist: For long-stroke tie rod cylinders with a stroke length of 500mm or more, the length of the four tie rods is also 500mm or more. After the tie rods are installed between the front end plate and the rear end plate, there is a certain gap between each tie rod and the outer peripheral wall of the cylinder body. Furthermore, due to the relatively long length of the tie rods, the middle part of the tie rods is easily subjected to impact and bent deformation during the actual use of long-stroke tie rod cylinders, which affects the service life of the cylinder. Utility Model Content

[0005] This application provides a dedicated tie rod for long-stroke hydraulic cylinders to improve the following technical problems: In actual use, the long-stroke tie rod cylinder is easily bent and deformed by impact in the middle, which affects the service life of the cylinder.

[0006] This application provides a special tie rod for long-stroke hydraulic cylinders, employing the following technical solution: A special tie rod for a long-stroke hydraulic cylinder includes a tie rod body and two mounting nuts. The two ends of the tie rod body are respectively threaded sections, and the two mounting nuts are respectively threaded onto the threaded sections. One or two support blocks are detachably mounted on the tie rod body. The tie rod body passes through the support blocks. The inner side of the support block is provided with a concave arc surface, which is used to fit against the outer peripheral wall of the hydraulic cylinder body. The position of the support block divides the tie rod body into equal parts along its length.

[0007] In one feasible technical solution of this application, a positioning ring is integrally formed on the main body of the pull rod, and the positioning ring is used to block the side of the support block away from the adjacent assembly nut.

[0008] In one feasible technical solution of this application, the support block is provided with an anti-slip rubber cylinder inside, the pull rod body passes through the anti-slip rubber cylinder, and the inner diameter of the anti-slip rubber cylinder is 0.2-0.4mm smaller than the outer diameter of the pull rod body.

[0009] In one feasible technical solution of this application, the anti-slip rubber cylinder and the support block are bonded and fixed together, and the inner peripheral wall of the anti-slip rubber cylinder is provided with anti-slip texture, and the thickness of the anti-slip rubber cylinder is between 2-4mm.

[0010] In one feasible technical solution of this application, the outer side of the support block away from the concave arc surface is provided with an arc chamfer.

[0011] In one feasible technical solution of this application, applicable to a four-bar hydraulic cylinder, two adjacent support blocks at corresponding positions on different bar bodies abut against each other, that is, the four support blocks form a frame ring structure through which the cylinder body passes.

[0012] In one feasible technical solution of this application, a magnetic strip is embedded on the abutting surface of the opposite sides of the support block, and the magnetic strip is used to magnetically fix two adjacent abutting support blocks.

[0013] In one feasible technical solution of this application, the length of the pull rod body is between 800-1200mm, and the length of the support block is between 50-100mm.

[0014] In one feasible technical solution of this application, both the support block and the pull rod body are made of 45# steel or high manganese alloy steel, and both surfaces are provided with a chromium plating layer. The thickness of the chromium plating layer is between 0.03-0.05mm, and the surface hardness of the support block and the pull rod body is between 45 and 52HRC.

[0015] In summary, this application includes at least one of the following beneficial technical effects: By adding one or two support blocks between the longer tie rod body and the outer peripheral wall of the cylinder, the longer tie rod body has multiple support points of 3 or 4. When subjected to external impact or compression, the tie rod body is not easy to bend or deform, which significantly improves the overall structural strength and service life of the cylinder. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of a long-stroke hydraulic cylinder tie rod according to an embodiment of this application.

[0018] Figure 2 This is a schematic diagram of the support block in an embodiment of this application.

[0019] Figure 3 This is a schematic diagram of the installation of the long-stroke hydraulic cylinder tie rod according to an embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 1. Tie rod body; 11. Threaded section; 12. Locating ring; 2. Assemble the nuts; 3. Support block; 31. Concave arc surface; 32. Chamfered corner; 4. Anti-slip rubber sleeve; 5. Magnetic strips. Detailed Implementation

[0021] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0022] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0023] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., 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 application 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 application.

[0024] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0025] The following is in conjunction with the appendix Figure 1-3 This application will be described in further detail.

[0026] This application discloses a tie rod specifically for long-stroke hydraulic cylinders. (Refer to...) Figure 1-3 The long-stroke hydraulic cylinder tie rod includes a tie rod body 1 and two mounting nuts 2. The two ends of the tie rod body 1 are respectively threaded sections 11, and the two mounting nuts 2 are respectively threaded onto the threaded sections 11. One or two support blocks 3 are detachably mounted on the tie rod body 1. The tie rod body 1 passes through the support blocks 3. The inner side of the support block 3 is provided with a concave arc surface 31, which is used to fit the outer peripheral wall of the hydraulic cylinder body. The position of the support block 3 divides the tie rod body 1 into equal parts along its length. Both the support block 3 and the tie rod body 1 are made of 45# steel or high manganese alloy steel. The length of the tie rod body 1 is between 800-1200mm, and the length of the support block 3 is between 50-100mm.

[0027] In order to facilitate the positioning of the support block 3 during the installation process, and to ensure that the support block 3 is quickly installed in the appropriate position and the pull rod body 1 is equally divided, a positioning ring 12 is integrally formed on the pull rod body 1. The positioning ring 12 is used to block the side of the support block 3 away from the adjacent assembly nut 2.

[0028] In this embodiment, to effectively prevent the support block 3 from easily sliding after being installed on the pull rod body 1, an anti-slip rubber cylinder 4 is provided inside the support block 3. The pull rod body 1 passes through the anti-slip rubber cylinder 4. The inner diameter of the anti-slip rubber cylinder 4 is 0.2-0.4mm smaller than the outer diameter of the pull rod body 1. The anti-slip rubber cylinder 4 has a certain elastic deformation capability, so the anti-slip rubber cylinder 4 with a slightly smaller inner diameter can be appropriately enlarged by the pull rod body 1 to achieve stable installation and improve the anti-slip effect. Specifically, the anti-slip rubber cylinder 4 and the support block 3 are bonded and fixed together, and the inner peripheral wall of the anti-slip rubber cylinder 4 is provided with anti-slip texture. The thickness of the anti-slip rubber cylinder 4 is between 2-4mm.

[0029] To prevent the edges and corners of the support block 3 from being too sharp and causing injury, the outer side of the support block 3 away from the concave arc surface 31 is provided with an arc chamfer 32.

[0030] The long-stroke hydraulic cylinder tie rod of this application is applicable to four-link hydraulic cylinders. In order to improve the structural stability of the support block 3 after installation and make it less prone to shaking and loosening, two adjacent support blocks 3 at corresponding positions on different tie rod bodies 1 are fitted and abutted against each other. That is, the four support blocks 3 form a frame ring structure through which the cylinder body passes. Magnet strips 5 are embedded on the abutting surfaces on opposite sides of the support blocks 3. The magnet strips 5 are used to magnetically fix two adjacent abutting support blocks 3.

[0031] To improve the structural strength and service life of the support block 3 and the pull rod body 1, and to prevent rust, both surfaces are coated with a chrome plating layer with a thickness between 0.03 and 0.05 mm. The surface hardness of the support block 3 and the pull rod body 1 is between 45 and 52 HRC.

[0032] The beneficial technical effects of the long-stroke hydraulic cylinder tie rod in this application embodiment are roughly as follows: By adding one or two support blocks 3 between the longer tie rod body 1 and the outer peripheral wall of the cylinder, the longer tie rod body 1 has multiple support points of 3 or 4. When subjected to external impact or compression, the tie rod body 1 is not easy to bend or deform, which significantly improves the overall structural strength and service life of the cylinder.

[0033] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this application should be included within the protection scope of this application.

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