Double-layer oil cylinder oil injection structure

Abstract

The utility model discloses a double-layer oil cylinder oil injection structure which comprises an oil injection module, the oil injection module comprises a low-pressure oil injection valve block, a low-pressure oil injection port, a low-pressure oil pipeline, a high-pressure oil injection port, a high-pressure oil pipeline, an upper-layer cylinder body oil through hole and a lower-layer cylinder body oil through hole, and the low-pressure oil injection valve block is connected to the upper portion of the front face of an upper-layer oil cylinder in a penetrating mode; one end of the front face of one low-pressure oil injection valve block is in threaded communication with a low-pressure oil injection port, the low-pressure oil injection valve block is in threaded communication with a low-pressure oil pipeline, the high-pressure oil injection port is in threaded communication with one end of the front face of one lower-layer oil cylinder, and the end of the front face of the lower-layer oil cylinder is in threaded communication with the end of the high-pressure oil pipeline. And an upper-layer cylinder body oil through hole and a lower-layer cylinder body oil through hole are respectively formed in the middle parts of the upper-layer oil cylinder and the lower-layer oil cylinder in a relatively communicated manner. The oil injection device meets the requirement for oil injection between the upper-layer oil cylinder and the lower-layer oil cylinder in a limited space, the use effect is improved, labor input is reduced, cost is reduced, and oil injection efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the field of oil injection technology for upper and lower cylinders of a stretching machine, specifically a double-layer cylinder oil injection structure. Background Technology

[0002] A tensile testing machine is a device used to test the mechanical properties of materials. It is suitable for the overall tensile testing of main bolts in nuclear island reactors. Currently, many hydraulic cylinders in the overall tensile testing machines for main bolts of nuclear island reactors are double-layered or even multi-layered. The oil connection between the cylinders and between the upper and lower cylinders is usually achieved by arranging oil pipes outside the cylinders. For some compact and fully functional tensile testers, the available space is very limited. Setting all the oil pipes externally is very difficult to arrange, requires a lot of manual work, and has a relatively high maintenance cost. Utility Model Content

[0003] The purpose of this utility model is to provide a double-layer hydraulic cylinder oil injection structure to solve the problem mentioned in the background art of oil injection between hydraulic cylinders and between upper and lower hydraulic cylinders in existing integral stretching machines with very compact space.

[0004] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0005] This utility model is a double-layer hydraulic cylinder oil injection structure, comprising:

[0006] The bearing module includes an upper hydraulic cylinder and a lower hydraulic cylinder, with the lower hydraulic cylinder located at the lower end of the upper hydraulic cylinder;

[0007] The oil injection module includes a low-pressure oil injection valve block, a low-pressure oil injection port, a low-pressure oil supply line, a high-pressure oil injection port, a high-pressure oil supply line, an upper cylinder oil supply hole, and a lower cylinder oil supply hole. The low-pressure oil injection valve block is connected to the upper part of the front of the upper cylinder. One end of the front of the low-pressure oil injection valve block is threadedly connected to the low-pressure oil injection port. The low-pressure oil injection valve block is threadedly connected to the low-pressure oil supply line. The high-pressure oil injection port is threadedly connected to one end of the front of the lower cylinder and is threadedly connected to the end of the front of the lower cylinder and the end of the high-pressure oil supply line. The upper cylinder and the lower cylinder are respectively provided with upper cylinder oil supply holes and lower cylinder oil supply holes in their middle parts.

[0008] Furthermore, the oil-filling module also includes a sealing ring and a plug. The upper cylinder oil passage hole and the lower cylinder oil passage hole are filled with a sealing ring at their docking positions, and the lower end of the lower cylinder oil passage hole is threaded with a plug.

[0009] Furthermore, the bearing module also includes a reset cylinder head, which is movably connected to the upper middle part of the upper cylinder.

[0010] Furthermore, it also includes a sealing connection module, which includes a threaded joint and a threaded cavity. The threaded joint is symmetrically threaded to the ends of the low-pressure oil pipeline and the high-pressure oil pipeline, and the threaded cavity penetrates through the middle of the threaded joint.

[0011] Furthermore, the sealing connection module also includes a positioning ring, a limiting frame, and a sealing gasket. The positioning ring is fixed in the middle section of the inner wall of the threaded cavity, and a limiting frame is sleeved on one side of the positioning ring. A sealing gasket is fixed on the inner edge of one side of the limiting frame.

[0012] Furthermore, the sealing gasket has a protrusion on one side, and a through opening is provided in the middle of the protrusion.

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

[0014] I. This utility model utilizes a low-pressure oil inlet in conjunction with a low-pressure oil pipeline to satisfy the resetting of the piston in the reset chamber of each set of oil cylinders. A high-pressure oil inlet in conjunction with a high-pressure oil pipeline is used to inject oil into each set of oil cylinders. Furthermore, an upper cylinder oil passage hole and a lower cylinder oil passage hole are provided between the upper and lower cylinders to inject oil between the upper and lower cylinders. This satisfies the oil injection needs between the upper and lower cylinders within a limited space, improves the usage effect, reduces manual input, lowers costs, and improves the efficiency of oil injection.

[0015] II. Based on the above-mentioned beneficial effects, threaded joints are used to connect low-pressure oil pipelines and high-pressure oil pipelines. During application, the positioning ring and limiting frame are used to structurally fix the sealing gasket, which can prevent the sealing gasket from falling off under long-term use and affecting the sealing effect. In addition, the protrusion can be used to remove the sealing gasket without contact, saving time and effort and preventing human hands from getting dirty. Attached Figure Description

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

[0017] Figure 1 This is an assembly drawing of the present utility model;

[0018] Figure 2 This is a cross-sectional view of the present invention;

[0019] Figure 3 This is a schematic diagram of the sealing connection module of this utility model;

[0020] Figure 4 This is a structural diagram of the sealing ring of this utility model.

[0021] The attached diagram lists the components represented by each number as follows:

[0022] In the diagram: 1. Reset cylinder head; 2. Upper cylinder; 3. Lower cylinder; 4. Low-pressure oil injection valve block; 5. Low-pressure oil injection port; 6. Low-pressure oil supply line; 61. Threaded joint; 62. Threaded cavity; 63. Positioning ring; 64. Limiting bracket; 65. Sealing gasket; 66. Protrusion; 7. High-pressure oil injection port; 8. High-pressure oil supply line; 9. Upper cylinder body oil passage; 10. Lower cylinder body oil passage; 11. Sealing ring; 12. Plug. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the embodiments of this utility model will be described in further detail below with reference to the accompanying drawings.

[0025] Please see Figure 1-4 As shown, this utility model is a double-layer hydraulic cylinder oil injection structure, comprising:

[0026] The load-bearing module includes an upper hydraulic cylinder 2 and a lower hydraulic cylinder 3, with the lower hydraulic cylinder 3 located at the lower end of the upper hydraulic cylinder 2.

[0027] The load-bearing module also includes a reset cylinder head 1, which is movably connected to the upper middle part of the upper cylinder 2.

[0028] The oil injection module includes a low-pressure oil injection valve block 4, a low-pressure oil injection port 5, a low-pressure oil passage 6, a high-pressure oil injection port 7, a high-pressure oil passage 8, an upper cylinder oil passage 9, and a lower cylinder oil passage 10. The low-pressure oil injection valve block 4 is connected to the upper front of the upper cylinder 2. One end of the front of the low-pressure oil injection valve block 4 is threaded to the low-pressure oil injection port 5. The connected low-pressure oil injection valve block 4 is threaded to the low-pressure oil passage 6. The high-pressure oil injection port 7 is threaded to one end of the front of the lower cylinder 3, and the connected end of the front of the lower cylinder 3 is threaded to the end of the high-pressure oil passage 8. The upper cylinder 2 and the lower cylinder 3 are respectively provided with an upper cylinder oil passage 9 and a lower cylinder oil passage 10 in the middle of their respective connections.

[0029] The oil injection valve block is installed at one end of the low-pressure oil injection port 5 and controls the flow of lubricating oil. The low-pressure oil injection port 5, together with the low-pressure oil supply line 6, injects oil into the cylinder reset chamber to meet the piston reset requirements. The high-pressure oil injection port 7, together with the high-pressure oil supply line 8, injects lubricating oil into each group of cylinders. The upper cylinder oil supply hole 9 and the lower cylinder oil supply hole 10 meet the oil injection requirements between the upper and lower cylinders 3. During this process, the upper and lower pistons and tension nuts are lifted, and the main bolt is stretched. After stretching, the hydraulic oil flows between the adjacent reset chambers through the low-pressure oil supply line 6 to reset the piston.

[0030] The oil-filling module also includes a sealing ring 11 and a plug 12. The upper cylinder oil passage hole 9 and the lower cylinder oil passage hole 10 are filled with a sealing ring 11 at the docking position, and the lower end of the lower cylinder oil passage hole 10 is threaded with a plug 12.

[0031] The sealing ring 11 ensures the sealing of the connection between the upper cylinder oil passage hole 9 and the lower cylinder oil passage hole 10, while the plug 12 blocks the lower cylinder oil passage hole 10 to prevent oil leakage.

[0032] Working principle: Low-pressure oil injection between cylinders: Low-pressure oil is injected into the low-pressure oil inlet 5 and flows through the low-pressure oil passages 6 that connect the cylinders to each other, ensuring the flow of low-pressure oil until the reset chambers of each cylinder are filled and the pistons are reset; High-pressure oil injection between cylinders: High-pressure oil is injected into the high-pressure oil inlet 7 and flows through the high-pressure oil passages 8 that connect the cylinders to each other; Oil injection between upper and lower cylinders 2 and 3: The upper cylinder oil passage 9 and the lower cylinder oil passage 10 are connected, so that when the lower cylinder 3 is injected with high-pressure oil, it can be directly transported to the upper cylinder 2.

[0033] This solution meets the oil injection needs between the upper and lower cylinders 2 and 3 within a limited space, improves the performance, reduces manual labor, lowers costs, and increases oil injection efficiency.

[0034] Please see Figure 1-4 As shown, this embodiment is based on the above embodiment 1, and further includes a sealing connection module. The sealing connection module includes a threaded joint 61 and a threaded cavity 62. The threaded joint 61 is symmetrically threaded to the ends of the low-pressure oil pipeline 6 and the high-pressure oil pipeline 8, and the threaded cavity 62 penetrates through the middle of the threaded joint 61.

[0035] The threaded connector 61, in conjunction with the threaded cavity 62 that runs through the center, facilitates the connection between the low-pressure oil supply line 6, the high-pressure oil supply line 8, the low-pressure oil injection valve block 4, and the lower oil cylinder 3.

[0036] The sealing connection module also includes a positioning ring 63, a limiting frame 64 and a sealing gasket 65. The positioning ring 63 is fixed in the middle section of the inner wall of the threaded cavity 62, and the limiting frame 64 is sleeved on one side of the positioning ring 63. The sealing gasket 65 is fixed on the inner edge of one side of the limiting frame 64.

[0037] The positioning ring 63, together with the limiting frame 64, limits the structure of the sealing gasket 65. The limited sealing gasket 65 has good shape retention, which can improve the sealing effect.

[0038] A protrusion 66 is provided on one side of the sealing gasket 65, and a through opening is provided in the middle of the protrusion 66;

[0039] The protrusion 66, when used with the through-hole, allows for contactless removal of the used sealing gasket 65 when utilizing the external hook structure.

[0040] Working principle: When connecting the low-pressure oil supply line 6 and the high-pressure oil supply line 8 to the low-pressure oil injection valve block 4 and the lower oil cylinder 3 respectively, a limiting frame 64 is first fitted on the positioning ring 63 on the inner wall of the threaded cavity 62, and a sealing gasket 65 is fitted on one side of the limiting frame 64. Then, one end of the threaded joint 61 is threadedly connected to the interface of the low-pressure oil injection valve block 4 and the lower oil cylinder 3 respectively.

[0041] This solution can prevent the sealing gasket 65 from falling off after long-term use, thus affecting the sealing effect. In addition, the protrusion 66 allows for contactless removal of the sealing gasket 65, saving time and effort and preventing stains on human hands.

[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A double-layer hydraulic cylinder oil injection structure, characterized in that, include: The bearing module includes an upper cylinder (2) and a lower cylinder (3), and the lower end of the upper cylinder (2) is provided with the lower cylinder (3); The oil injection module includes a low-pressure oil injection valve block (4), a low-pressure oil injection port (5), a low-pressure oil passage (6), a high-pressure oil injection port (7), a high-pressure oil passage (8), an upper cylinder oil passage (9), and a lower cylinder oil passage (10). The low-pressure oil injection valve block (4) is connected to the upper front of the upper cylinder (2). One end of the front of the low-pressure oil injection valve block (4) is threadedly connected to the low-pressure oil injection port (5). The low-pressure oil injection valve block (4) is threadedly connected to the low-pressure oil passage (6). The high-pressure oil injection port (7) is threadedly connected to one end of the front of the lower cylinder (3), and the end of the front of the lower cylinder (3) is threadedly connected to the end of the high-pressure oil passage (8). The upper cylinder (2) and the lower cylinder (3) are respectively provided with an upper cylinder oil passage (9) and a lower cylinder oil passage (10) in the middle.

2. The double-layer hydraulic cylinder oil injection structure according to claim 1, characterized in that: The oil injection module also includes a sealing ring (11) and a plug (12). The upper cylinder oil passage hole (9) and the lower cylinder oil passage hole (10) are filled with a sealing ring (11) at their docking positions, and the lower end of the lower cylinder oil passage hole (10) is threaded with a plug (12).

3. The double-layer hydraulic cylinder oil injection structure according to claim 1, characterized in that: The bearing module also includes a reset cylinder head (1), which is movably connected to the upper middle part of the upper cylinder (2).

4. The double-layer hydraulic cylinder oil injection structure according to claim 1, characterized in that: It also includes a sealing connection module, which includes a threaded connector (61) and a threaded cavity (62). The threaded connector (61) is symmetrically threaded to the ends of the low-pressure oil pipeline (6) and the high-pressure oil pipeline (8), and the threaded cavity (62) penetrates the middle of the threaded connector (61).

5. The double-layer hydraulic cylinder oil injection structure according to claim 4, characterized in that: The sealing connection module also includes a positioning ring (63), a limiting frame (64), and a sealing gasket (65). The positioning ring (63) is fixed in the middle section of the inner wall of the threaded cavity (62), and the limiting frame (64) is sleeved on one side of the positioning ring (63). The sealing gasket (65) is fixed on the inner edge of one side of the limiting frame (64).

6. The double-layer hydraulic cylinder oil injection structure according to claim 5, characterized in that: The sealing gasket (65) has a protrusion (66) on one side, and the protrusion (66) has a through opening in the middle.

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