Hydraulic cylinder with good corrosion resistance

Abstract

The utility model discloses a hydraulic cylinder with good corrosion resistance, and relates to the technical field of hydraulic cylinders. Comprising an outer-layer cylinder barrel, an inner-layer cylinder barrel is installed in the outer-layer cylinder barrel, a closed end cover and a through hole end cover are installed on the two sides of the outer-layer cylinder barrel respectively, and a plurality of fixing rods with threads on the two sides are installed between the closed end cover and the through hole end cover; anti-corrosion sealing assemblies are arranged between the outer-layer cylinder barrel and the inner-layer cylinder barrel and the closed end covers on the two sides and between the inner-layer cylinder barrel and the through hole end covers on the two sides. Through the design that the anti-corrosion medium is filled between the outer-layer cylinder barrel and the inner-layer cylinder barrel, an additional anti-corrosion guarantee is provided for the inner-layer cylinder barrel, even if the piston rod works in a severe environment for a long time, the anti-corrosion performance of the cylinder body can be ensured, and the requirement for working in a complex environment for a long time is met; layer-by-layer protection is realized from the primer to the finishing coat to the chromium plating layer, so that the corrosion resistance is greatly improved, and the problem that the coating is easy to wear and fall off is effectively solved.

Description

TECHNICAL FIELD

[0001] The utility model relates to hydraulic cylinder technical field, specifically, relate to a kind of hydraulic cylinder with good anticorrosive property. BACKGROUND

[0002] Hydraulic cylinder is widely used in many fields of industrial production as the hydraulic energy conversion into mechanical energy, doing linear reciprocating motion (or swing motion) hydraulic actuator.

[0003] The cylinder anticorrosion measure of existing hydraulic cylinder mainly relies on surface coating, but coating is easily abraded, falls off in long-term use process, cannot effectively guarantee the anticorrosive property of hydraulic cylinder, cannot satisfy the demand of hydraulic cylinder working in harsh environment for a long time.

[0004] Therefore we make improvement to this, propose a kind of hydraulic cylinder with good anticorrosive property. UTILITY MODEL CONTENT

[0005] The utility model is directed at: the cylinder anticorrosion measure of existing hydraulic cylinder mainly relies on surface coating, but coating is easily abraded, falls off in long-term use process, cannot effectively guarantee the anticorrosive property of hydraulic cylinder, cannot satisfy the demand of hydraulic cylinder working in harsh environment for a long time.

[0006] In order to realize the above-mentioned utility model purpose, the utility model provides the following technical scheme:

[0007] A kind of hydraulic cylinder with good anticorrosive property to improve the above-mentioned problem.

[0008] The application is as follows:

[0009] Including outer cylinder, the inside of outer cylinder is installed with inner cylinder, the both sides of outer cylinder are installed with closed end cap and through-hole end cap respectively, a plurality of fixed rods with thread on both sides are installed between closed end cap and through-hole end cap, piston rod is slidably fitted in the middle of through-hole end cap, the end of piston rod in inner cylinder is installed with piston, anticorrosion sealing assembly is arranged between outer cylinder, inner cylinder and both sides closed end cap and through-hole end cap.

[0010] By filling anticorrosive medium between outer cylinder and inner cylinder, additional anticorrosion guarantee is provided for inner cylinder, even in harsh environment for a long time, the anticorrosive property of cylinder body can be ensured, the demand of working in complex environment for a long time is satisfied, the multilayer coating design of piston rod, from primer to finish, to chrome plating layer, layer by layer protection, greatly improve its anticorrosion ability, effectively solve the problem of coating easy to abrade and fall off.

[0011] As a preferred embodiment of the utility model provides good anticorrosive hydraulic cylinder, the fixed rod both ends thread cooperation has located the installation nut of two outer sides of closed end cap and through hole end cap.

[0012] As a preferred embodiment of the utility model provides good anticorrosive hydraulic cylinder, the piston's circumferential mounting plate has the first sealing portion that cooperates with the inner wall of inner layer cylinder barrel, and the second sealing portion is established between the opening of through hole end cap and the outer wall of piston rod.

[0013] As a preferred embodiment of the utility model provides good anticorrosive hydraulic cylinder, the side of closed end cap is provided with the first oil port that is linked with the inside of inner layer cylinder barrel, and the side of through hole end cap is provided with the second oil port that is linked with the inside of inner layer cylinder barrel.

[0014] As a preferred embodiment of the utility model provides good anticorrosive hydraulic cylinder, the outer layer of piston rod is coated with epoxy zinc-rich primer, the outer layer of epoxy zinc-rich primer is coated with polyurethane finish, and the outer layer of polyurethane finish is provided with chromium plating.

[0015] As a preferred embodiment of the utility model provides good anticorrosive hydraulic cylinder, the anticorrosive sealing assembly includes the anticorrosive sealing pad mounted at both ends of outer layer cylinder barrel and inner layer cylinder barrel, and the opposite sides of closed end cap and through hole end cap are provided with sealing grooves matched with anticorrosive sealing pad.

[0016] As a preferred embodiment of the utility model provides good anticorrosive hydraulic cylinder, the inner wall of outer layer cylinder barrel and the outer wall of inner layer cylinder barrel form a sealed cavity, the cavity is filled with anticorrosive medium, a reinforcing block is mounted between the inner wall of outer layer cylinder barrel and the outer wall of inner layer cylinder barrel, and one end of outer layer cylinder barrel is provided with a filling hole communicated with the cavity.

[0017] As a preferred embodiment of the utility model provides good anticorrosive hydraulic cylinder, the inner and outer diameters of anticorrosive sealing pad are respectively provided with sealing pads matched with inner layer cylinder barrel and outer layer cylinder barrel, one side of outer diameter sealing pad is provided with a closing pad, and the outer wall of outer layer cylinder barrel is provided with a closing groove matched with closing pad.

[0018] Compared with the prior art, the utility model has the beneficial effects that: by filling anticorrosive medium between outer layer cylinder barrel and inner layer cylinder barrel, additional anticorrosive protection is provided for the inner layer cylinder barrel, even in harsh environments for a long time, the anticorrosive performance of the cylinder body can be ensured, the long-term working demand in complex environment is met, the multilayer coating design of the piston rod, from primer to finish to chromium plating, layer by layer protection, greatly improves the anticorrosive ability, effectively solves the problems of easy wear and tear and falling of the coating. Attached Figure Description

[0019] Figure 1 A schematic diagram of the overall structure of the corrosion-resistant hydraulic cylinder provided in this application;

[0020] Figure 2 A schematic side sectional view of the overall structure of the corrosion-resistant hydraulic cylinder provided in this application;

[0021] Figure 3 Provided for this application Figure 3 -Structural diagram at point A;

[0022] Figure 4 A schematic diagram of the connection structure between the outer cylinder barrel and the inner cylinder barrel provided in this application;

[0023] Figure 5 Provided for this application Figure 4 -Structural diagram at point B;

[0024] Figure 6 This is a schematic diagram of the side sectional view of the piston rod provided in this application.

[0025] The image shows:

[0026] 1. Outer cylinder barrel; 2. Closing end cap; 3. Through-hole end cap; 4. Fixing rod; 5. Mounting nut; 6. Piston rod; 7. Corrosion-resistant sealing assembly; 701. Corrosion-resistant sealing gasket; 702. Sealing groove; 703. Cavity; 704. Corrosion-resistant medium; 705. Reinforcing block; 706. Filling hole; 707. Sealing gasket; 708. Closing gasket; 709. Closing groove; 8. Piston; 9. First sealing part; 10. Second sealing part; 11. First oil port; 12. Second oil port; 13. Inner cylinder barrel. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model.

[0028] Therefore, the following detailed description of the embodiments of this utility model is not intended to limit the scope of the claimed utility model, but merely to illustrate some embodiments of the utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without inventive effort are within the scope of protection of this utility model.

[0029] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the present invention can be combined with each other.

[0030] It should be noted that like reference numerals and letters refer to like items in the several views, and once an item is defined in one view, it should not be further defined and explained in subsequent views.

[0031] In the description of the present application, it should be noted that the terms "upper", "lower" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, or the orientation or positional relationship commonly used when the product of the present application is used, or the orientation or positional relationship commonly understood by those skilled in the art. Such terms are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms "first", "second" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0032] In order for those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings.

[0033] It should be noted that the embodiments in the present application and the features and technical solutions in the embodiments can be combined with each other without conflict.

[0034] It should be noted that like reference numerals and letters refer to like items in the several views, and once an item is defined in one view, it should not be further defined and explained in subsequent views.

[0035] Example 1

[0036] Please refer to Figures 1-6The utility model provides an anticorrosive hydraulic cylinder, which comprises an outer cylinder 1, an inner cylinder 13 installed in the inner part of the outer cylinder 1, a closed end cover 2 and a through-hole end cover 3 installed on both sides of the outer cylinder 1, a plurality of fixed rods 4 with threads on both sides installed between the closed end cover 2 and the through-hole end cover 3, a piston rod 6 slidingly fitted in the middle part of the through-hole end cover 3, a piston 8 installed at one end of the piston rod 6 in the inner cylinder 13, and an anticorrosive sealing assembly 7 arranged between the outer cylinder 1, the inner cylinder 13 and the closed end cover 2 and the through-hole end cover 3 on both sides. Threaded nuts 5 are fitted on the threads at both ends of the fixed rods 4 and located outside the closed end cover 2 and the through-hole end cover 3. The circumferential side of the piston 8 is provided with a first sealing part 9 matched with the inner wall of the inner cylinder 13, and a second sealing part 10 is arranged between the opening of the through-hole end cover 3 and the outer wall of the piston rod 6. The side of the closed end cover 2 is provided with a first oil port 11 connected with the inner part of the inner cylinder 13, and the side of the through-hole end cover 3 is provided with a second oil port 12 connected with the inner part of the inner cylinder 13. The outer layer of the piston rod 6 is coated with an epoxy zinc-rich primer 14, the outer layer of the epoxy zinc-rich primer 14 is coated with a polyurethane finish 15, and the outer layer of the polyurethane finish 15 is provided with a chromium plating layer 16.

[0037] Implementation process: the first sealing part 9 is installed on the circumferential side of the piston 8 and tightly matched with the inner wall of the inner cylinder 13, effectively preventing the hydraulic oil from flowing on both sides of the piston, ensuring the normal pressure transmission of the hydraulic system. The second sealing part 10 is arranged between the opening of the through-hole end cover 3 and the outer wall of the piston rod 6, preventing the hydraulic oil from leaking from the gap and blocking the impurities from the outside into the inner part of the cylinder. The outer layer of the piston rod 6 is coated with an epoxy zinc-rich primer 14, a polyurethane finish 15 and a chromium plating layer 16 in sequence. The zinc powder in the epoxy zinc-rich primer 14 can form a cathode protection on the metal surface, effectively preventing rust. The polyurethane finish 15 has good weather resistance and chemical stability, further blocking the external corrosive medium. The chromium plating layer 16 improves the hardness and wear resistance of the surface of the piston rod 6, enhancing the anticorrosive ability.

[0038] Implementation benefit: the multilayer coating design of the piston rod 6, from primer to finish to chromium plating layer, provides layer-by-layer protection, greatly improving the anticorrosive ability.

[0039] Example 2

[0040] The anticorrosion sealing assembly 7 comprises anticorrosion sealing pads 701 installed at both ends of the outer cylinder 1 and the inner cylinder 13, and the opposite sides of the closed end cover 2 and the through-hole end cover 3 are provided with sealing grooves 702 matched with the anticorrosion sealing pads 701. A sealed cavity 703 is formed between the inner wall of the outer cylinder 1 and the outer wall of the inner cylinder 13, the cavity 703 is filled with anticorrosive medium 704, a reinforcing block 705 is installed between the inner wall of the outer cylinder 1 and the outer wall of the inner cylinder 13, and one end of the outer cylinder 1 is provided with a filling hole 706 connected with the cavity 703. The inner and outer diameters of the anticorrosion sealing pad 701 are respectively provided with sealing pads 707 matched with the inner cylinder 13 and the outer cylinder 1, one side of the outer diameter sealing pad 707 is provided with a closing pad 708, and the outer wall of the outer cylinder 1 is provided with a closing groove 709 matched with the closing pad 708.

[0041] Implementation process: The anticorrosion sealing pads 701 in the anticorrosion sealing assembly 7 are installed at both ends of the outer cylinder 1 and the inner cylinder 13, and are tightly matched with the sealing grooves 702 on the closed end cover 2 and the through-hole end cover 3 to form a sealed structure, preventing external corrosive medium from entering the cavity 703 between the outer cylinder 1 and the inner cylinder 13. The sealing effect is further enhanced by the sealing pads 707 and the closing pad 708, the closing pad 708 is matched with the closing groove 709 on the outer wall of the outer cylinder 1 to make the entire sealing structure more airtight; the cavity 703 between the outer cylinder 1 and the inner cylinder 13 is filled with anticorrosive medium 704, which can continuously protect the outer wall of the inner cylinder 13, even if the surface coating of the inner cylinder 13 is partially damaged, the anticorrosive medium 704 can inhibit further corrosion. The reinforcing block 705 is installed between the inner wall of the outer cylinder 1 and the outer wall of the inner cylinder 13, which not only enhances the structural stability between the two cylinders, but also reduces the friction between the inner cylinder 13 and the outer cylinder 1 caused by vibration and other factors, avoiding damage to the surface protective layer of the inner cylinder 13.

[0042] Implementation benefits: The design of filling the anticorrosive medium 704 between the outer cylinder 1 and the inner cylinder 13 provides additional anticorrosion protection for the inner cylinder 13.

[0043] The above embodiments are only used to illustrate the technical solutions described in the utility model and not to limit the utility model. Although the utility model has been described in detail with reference to the above embodiments, the utility model is not limited to the above specific implementation methods, and any modification or equivalent replacement of the utility model is allowed. All technical solutions and improvements that do not deviate from the spirit and scope of the utility model are covered in the scope of the claims of the utility model.

Claims

1. A hydraulic cylinder with good corrosion resistance, characterized in that, Include: The outer cylinder (1), the inside of the outer cylinder (1) is installed with the inner cylinder (13), the both sides of the outer cylinder (1) are installed with the closed end cover (2) and the through hole end cover (3) respectively, a plurality of fixed rods (4) with threads on both sides are installed between the closed end cover (2) and the through hole end cover (3), the middle part of the through hole end cover (3) is slidably fitted with a piston rod (6), one end of the piston rod (6) located in the inner cylinder (13) is installed with a piston (8), the outer cylinder (1) and the inner cylinder (13) are provided with anticorrosive sealing assemblies (7) between the both sides closed end cover (2) and the through hole end cover (3).

2. The hydraulic cylinder with good corrosion resistance according to claim 1, characterized in that, The threads on both ends of the fixed rod (4) are fitted with mounting nuts (5) located on both outer sides of the closed end cover (2) and the through hole end cover (3).

3. The hydraulic cylinder of claim 1, wherein The circumferential side mounting plate of the piston (8) has a first sealing part (9) matched with the inner wall of the inner cylinder (13), and a second sealing part (10) is arranged between the opening of the through hole end cover (3) and the outer wall of the piston rod (6).

4. The hydraulic cylinder of claim 1, wherein The side edge of the closed end cover (2) is provided with a first oil port (11) communicated with the inside of the inner cylinder (13), and the side edge of the through hole end cover (3) is provided with a second oil port (12) communicated with the inside of the inner cylinder (13).

5. The hydraulic cylinder of claim 1, wherein The outer layer of the piston rod (6) is coated with an epoxy zinc-rich primer (14), the outer layer of the epoxy zinc-rich primer (14) is coated with a polyurethane finish (15), and the outer layer of the polyurethane finish (15) is provided with a chromium plating layer (16).

6. The hydraulic cylinder of claim 1, wherein The anticorrosive sealing assembly (7) includes an anticorrosive sealing gasket (701) mounted at both ends of the outer cylinder (1) and the inner cylinder (13), and a sealing groove (702) matched with the anticorrosive sealing gasket (701) is formed on the opposite side of the closed end cover (2) and the through hole end cover (3).

7. The hydraulic cylinder of claim 6, wherein A sealed cavity (703) is formed between the inner wall of the outer cylinder (1) and the outer wall of the inner cylinder (13), the cavity (703) is filled with anticorrosive medium (704), and a reinforcing block (705) is mounted between the inner wall of the outer cylinder (1) and the outer wall of the inner cylinder (13).

8. The hydraulic cylinder of claim 7, wherein The inner and outer diameters of the anticorrosive sealing gasket (701) are respectively provided with sealing gaskets (707) matched with the inner cylinder (13) and the outer cylinder (1), one side of the outer diameter of the sealing gasket (707) is provided with a closing gasket (708), and the outer wall of the outer cylinder (1) is provided with a closing groove (709) matched with the closing gasket (708).

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