Oil cylinder with external leakage oil recycling structure

Abstract

The utility model discloses an oil cylinder with an external leakage oil recycling structure. The problem that an existing oil cylinder leakage oil treatment cost is high is solved. The piston comprises a cylinder body, a piston and a piston rod, the first cover body is connected with the cylinder body; the piston rod penetrates through the first cover body and is arranged outside the cylinder body; a sealing ring and a dustproof ring are arranged on the first cover body, an annular groove is formed between the sealing ring and the dustproof ring, and an oil drainage hole communicated with the annular groove is formed in the first cover body; the connecting piece is arranged on the first cover body, and at least one end of the connecting piece is communicated with the oil drainage hole and matched with the first cover body to form a sealing cavity. The utility model has the beneficial effects that the connecting piece is arranged, leaked oil of the first cover body is received through the connecting piece, the leaked oil is prevented from being wasted and polluting the environment, the structure is simple, a machine cannot be influenced, and the oil tank is suitable for batch production and use.

Description

Technical Field

[0001] This utility model relates to a hydraulic cylinder, specifically a hydraulic cylinder with an external leakage oil reuse structure. Background Technology

[0002] Injection molding machines, also known as injection molding machines, are the main molding equipment used to create various shapes of plastic products from thermoplastic or thermosetting plastics using plastic molds. The injection cylinders of injection molding machines are prone to oil leakage due to their high operating frequency. The main area of ​​oil leakage is the seals between the cylinder head and piston rod. The reciprocating motion over a long period causes oil to accumulate at the seals. If not drained promptly, the accumulated oil can eventually break through the seals, leading to continuous leakage at the cylinder's dust seal. This pollutes the environment, damages the dust seal, and reduces the sealing effect of the U-ring, which plays a crucial role in high-pressure sealing. Therefore, the current approach is usually to replace the seals and dust seals after leakage occurs. This only provides a remedial effect but causes serious environmental pollution and is difficult to detect. Another method involves adding an oil drain device. Existing drain devices typically involve connecting a long hose from the bottom of the cylinder head to the oil tank. Because it's a leak, the amount of oil leaking is small, and the oil flows down to the tank under its own weight, resulting in significant resistance. The hose cannot be twisted during assembly, and it's usually quite long, leading to high costs. This is detrimental to the overall aesthetics and economic efficiency of the machine. Over time, the hose is also prone to damage, which is difficult to detect. This structure has the following problems during use: 1. High economic cost and unsightly appearance; 2. Difficulty in achieving uniformity in hose tightening and binding, hindering mass production; 3. Excessive hose length can lead to twisting and compression, obstructing oil flow; 4. Over time, the hose is prone to damage, which is difficult to detect. Utility Model Content

[0003] To address the high cost of handling oil leakage in existing hydraulic cylinders, this invention provides a hydraulic cylinder with an external oil leakage reuse structure.

[0004] The technical solution of this utility model is: a cylinder with an external leakage oil reuse structure, including a cylinder body, and further comprising:

[0005] A piston is disposed within a cylinder and slides in conjunction with the piston, wherein the piston divides the space within the cylinder into a rod chamber and a rodless chamber.

[0006] The piston rod is mounted on the piston and moves in conjunction with the piston.

[0007] The first cover is connected to the cylinder body; the piston rod passes through the first cover and is located outside the cylinder body; the first cover is provided with a sealing ring and a dustproof ring, an annular groove is provided between the sealing ring and the dustproof ring, and an oil drain hole is provided on the first cover that communicates with the annular groove.

[0008] A connector is provided on the first cover, and at least one end of the connector is connected to the oil drain hole and cooperates with the first cover to form a sealed cavity.

[0009] As a further improvement of this utility model, there are two oil drain holes, and the two ends of the connector are connected to different oil drain holes. The different oil drain holes are all provided on the first cover and connected to the annular groove.

[0010] As a further improvement of this utility model, the connecting member is connected to the first cover body via a lubrication joint.

[0011] As a further improvement of this utility model, both ends of the connector are provided with the lubrication joints, and the connector is detachably connected to at least one lubrication joint.

[0012] As a further improvement of this utility model, the two oil drain holes are provided on the upper and lower sides of the first cover, and the connecting member is provided outside the first cover and is detachably connected to the oil drain holes, so that the two ends of the connecting member form a height difference.

[0013] As a further improvement of this utility model, the first cover is provided with a working hole, the piston rod passes through the working hole, the annular groove surrounds the working hole, and there are at least two oil drain holes. The different oil drain holes are all connected to the annular groove. The different oil drain holes are connected outside the first cover by a connector, and the connector and the oil drain hole cooperate with each other to form the sealing cavity.

[0014] As a further improvement of this utility model, the connector is integrally molded from nylon material.

[0015] As a further improvement of this utility model, the connecting member is a transparent tube.

[0016] As a further improvement of this utility model, the sealing ring is a U-shaped ring, and the dustproof ring includes a first leg, a second leg and a third leg. The first leg and the second leg are arranged in a V-shape and are in contact with the outer surface of the piston rod, and the third leg is in contact with the first cover.

[0017] As a further improvement of this utility model, it also includes a second cover. The first cover is provided with a first oil inlet, and the second cover is provided with a second oil inlet. The first oil inlet is connected to the rod chamber, and the second oil inlet is connected to the rodless chamber.

[0018] The beneficial effects of this utility model are that it incorporates a connecting component to catch any oil leakage from the first cover, preventing oil waste and environmental pollution. The structure is simple, does not affect the machine, and is suitable for mass production. This utility model also boasts advantages such as simple structure, convenient assembly, reliable operation, and long service life. Attached Figure Description

[0019] Appendix Figure 1 This is a structural schematic diagram of an embodiment of the present utility model.

[0020] Appendix Figure 2 This is a schematic diagram of the structure of the first cover in an embodiment of the present utility model.

[0021] Appendix Figure 3 For the appendix Figure 1 A magnified structural diagram of point A in the middle.

[0022] In the diagram, 1. Cylinder block; 11. Rod chamber; 12. Rodless chamber; 2. Piston; 3. Piston rod; 4. First cover; 41. Sealing ring; 42. Dustproof ring; 421. First support leg; 422. Second support leg; 423. Third support leg; 43. Annular groove; 44. Oil drain hole; 45. Working hole; 46. First oil inlet; 5. Connector; 51. Sealing cavity; 52. Lubrication joint; 6. Second cover; 61. Second oil inlet. Detailed Implementation

[0023] The embodiments of this utility model will be further described below with reference to the accompanying drawings:

[0024] Depend on Figure 1 Combination Figure 2-3 As shown, a hydraulic cylinder with an external leakage oil recycling structure includes a cylinder body 1, and further includes:

[0025] Piston 2 is disposed inside cylinder 1 and slides with piston 2. The piston 2 divides the space inside cylinder 1 into rod chamber 11 and rodless chamber 12.

[0026] Piston rod 3 is mounted on piston 2 and is linked with piston 2;

[0027] The first cover 4 is connected to the cylinder 1; the piston rod 3 passes through the first cover 4 and is located outside the cylinder 1; the first cover 4 is provided with a sealing ring 41 and a dustproof ring 42, and an annular groove 43 is provided between the sealing ring 41 and the dustproof ring 42; the first cover 4 is provided with an oil drain hole 44 that communicates with the annular groove 43.

[0028] A connector 5 is disposed on the first cover 4. At least one end of the connector 5 is connected to the oil drain hole 44 and cooperates with the first cover 4 to form a sealed cavity 51. The advantages of this invention are that the connector catches leaked oil from the first cover, preventing oil waste and environmental pollution. The structure is simple, does not affect the machine, and is suitable for mass production. This invention also has the advantages of simple structure, convenient assembly, reliable operation, and long service life.

[0029] There are two oil drain holes 44. The two ends of the connector 5 are connected to different oil drain holes 44. The different oil drain holes 44 are all provided on the first cover and connected to the annular groove 43.

[0030] The first cover has two oil drain holes that are interconnected (via a connector). Lubrication connectors are installed at two points on the first cover, and these connectors are screwed onto the cylinder head for sealing. In practice, the lubrication connectors can be detachably connected to the first cover. The two lubrication connectors are connected by a transparent nylon tube (connector). This transparent nylon tube is hollow; when oil leakage accumulates to a certain level, the oil flows into the transparent nylon tube, effectively increasing the volume of the annular oil groove. Its functions are as follows: 1. It can accommodate more leaked oil, effectively increasing the volume of the annular groove; 2. It allows direct observation of the rate at which the oil level rises in the transparent nylon tube, enabling accurate assessment of the extent of damage to the internal U-ring (sealing ring). In other words, if the oil level rises rapidly within a few days or a short period, it indicates that the U-ring is damaged and needs to be replaced; conversely, a slow rise indicates a good seal. Thirdly, the leaking oil in the annular groove lubricates the piston rod. Fourthly, it solves the problem of the previously required long hoses connecting the first cover to the oil tank, which made oil drainage difficult and complicated. Long hoses were necessary and prone to leaks that polluted the environment. This invention reduces costs and eliminates the problem of aging and damage to the nylon hoses. Fifthly, it has a simple and aesthetically pleasing design; the transparent nylon tube is easy to observe and doesn't take up much space. Sixthly, when the transparent nylon tube is full of oil, the oil can be easily and quickly drained by disconnecting the lubrication connector above the first cover, even without stopping the machine. Because the leaked oil is minimal and requires a long accumulation period to fill the transparent nylon tube, there's no need to frequently disconnect the tube to drain oil; draining is very convenient once full. Seventhly, it improves the overall quality and economic efficiency of the machine.

[0031] The connecting member 5 is connected to the first cover 4 via a lubrication connector 52. Specifically, both ends of the connecting member 5 are provided with the lubrication connector 52, and the connecting member 5 is detachably connected to at least one lubrication connector 52. In practice, the detachable connection can be achieved by using the lubrication connector to the first cover, or the connecting member can be detachably connected to the lubrication connector to facilitate the emptying of leaked oil from the hollow connecting member during oil drainage.

[0032] The two oil drain holes 44 are located on the upper and lower sides of the first cover 4. The connector 5 is located outside the first cover 4 and is detachably connected to the oil drain holes 44, creating a height difference between the two ends of the connector 5. Specifically, the detachable connection can be achieved by a lubrication connector to the first cover, or the connector can be detachably connected to the lubrication connector, thereby achieving a detachable connection between the connector and the oil drain holes. This allows the upper end of the connector to be separated from the lubrication connector, while the leaked oil remains within the sealed cavity and is concentrated at the lower end of the connector, facilitating the collection and reuse of the leaked oil.

[0033] The first cover 4 has a working hole 45 through which the piston rod 3 passes. An annular groove 43 surrounds the working hole 45. There are at least two oil drain holes 44, each connected to the annular groove 43. These drain holes 44 are connected outside the first cover 4 by a connector 5, which cooperates with the drain holes 44 to form the sealing cavity 51. This structure facilitates the collection of leaked oil. In practice, the preferred embodiment of this invention is to have two oil drain holes, although three, four, or even more can also be used.

[0034] The connector 5 is integrally molded from nylon material. Specifically, the connector 5 is a transparent tubular fitting. This structure makes the connector easy to process, easy to install, and easy to observe oil leakage, thereby determining whether the sealing ring needs to be replaced.

[0035] The sealing ring 41 is a U-shaped ring, and the dustproof ring 42 includes a first support 421, a second support 422, and a third support 423. The first support 421 and the second support 422 are V-shaped and fit against the outer surface of the piston rod 3, while the third support 423 fits against the first cover 4. This structure ensures reliable sealing and a simple design.

[0036] This utility model also includes a second cover 6. The first cover 4 has a first oil inlet 46, and the second cover 6 has a second oil inlet 61. The first oil inlet 46 is connected to the rod chamber 11, and the second oil inlet 61 is connected to the rodless chamber 12. This structure makes the piston movement smooth and facilitates oil intake and discharge.

[0037] In the description of this utility model, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description. They 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, and therefore should not be construed as a limitation on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0038] 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0039] Please note to all technical personnel: Although this utility model has been described according to the specific embodiments above, the inventive concept of this utility model is not limited to this utility model. Any modification that utilizes the inventive concept will be included within the scope of protection of this utility model patent.

Claims

1. A hydraulic cylinder with an external leakage oil reuse structure, comprising a cylinder body (1), characterized in that: Also includes: Piston (2) is located inside cylinder (1) and slides in cooperation with piston (2). The piston (2) divides the space inside cylinder (1) into rod chamber (11) and rodless chamber (12). Piston rod (3) is mounted on piston (2) and is linked with piston (2); The first cover (4) is connected to the cylinder (1); the piston rod (3) passes through the first cover (4) and is located outside the cylinder (1); the first cover (4) is provided with a sealing ring (41) and a dustproof ring (42), and an annular groove (43) is provided between the sealing ring (41) and the dustproof ring (42); the first cover (4) is provided with an oil drain hole (44) that communicates with the annular groove (43). A connector (5) is provided on the first cover (4). At least one end of the connector (5) is connected to the oil drain hole (44) and cooperates with the first cover (4) to form a sealed cavity (51).

2. The oil cylinder with an external leakage oil reuse structure according to claim 1, characterized in that... There are two oil drain holes (44), and the two ends of the connector (5) are connected to different oil drain holes (44). The different oil drain holes (44) are all located on the first cover and connected to the annular groove (43).

3. A hydraulic cylinder with an external leakage oil reuse structure according to claim 1 or 2, characterized in that... The connector (5) is connected to the first cover (4) via a lubrication joint (52).

4. A hydraulic cylinder with an external leakage oil reuse structure according to claim 3, characterized in that... Both ends of the connector (5) are provided with the lubrication joint (52), and the connector (5) is detachably connected to at least one lubrication joint (52).

5. A hydraulic cylinder with an external leakage oil reuse structure according to claim 2, characterized in that... The two oil drain holes (44) are located on the upper and lower sides of the first cover (4). The connector (5) is located outside the first cover (4) and is detachably connected to the oil drain holes (44), so that the two ends of the connector (5) form a height difference.

6. A hydraulic cylinder with an external leakage oil reuse structure according to claim 1, characterized in that... The first cover (4) is provided with a working hole (45), the piston rod (3) is provided through the working hole (45), the annular groove (43) is provided around the working hole (45), and there are at least two oil drain holes (44). The different oil drain holes (44) are all connected to the annular groove (43). The different oil drain holes (44) are connected outside the first cover (4) by a connector (5) so that the connector (5) and the oil drain hole (44) cooperate with each other to form the sealing cavity (51).

7. A hydraulic cylinder with an external leakage oil reuse structure according to claim 1, characterized in that... The connector (5) is integrally molded from nylon material.

8. A hydraulic cylinder with an external leakage oil reuse structure according to claim 1, characterized in that... The connector (5) is a transparent tube.

9. A hydraulic cylinder with an external leakage oil reuse structure according to claim 1, characterized in that... The sealing ring (41) is a U-shaped ring, and the dustproof ring (42) includes a first leg (421), a second leg (422) and a third leg (423). The first leg (421) and the second leg (422) are arranged in a V shape and are in contact with the outer surface of the piston rod (3). The third leg (423) is in contact with the first cover (4).

10. A hydraulic cylinder with an external leakage oil reuse structure according to claim 1, characterized in that... It also includes a second cover (6), the first cover (4) is provided with a first oil inlet (46), the second cover (6) is provided with a second oil inlet (61), the first oil inlet (46) is connected to the rod chamber (11), and the second oil inlet (61) is connected to the rodless chamber (12).

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