Steel ring sealing structure for oil cylinder piston of injection molding machine

Abstract

The invention relates to the field of injection molding machine pistons, and discloses a steel ring sealing structure for an injection molding machine oil cylinder piston, the steel ring sealing structure comprises an injection molding machine body, an oil cylinder cover is arranged at the position close to the left side of the middle of the injection molding machine body, and the oil cylinder cover is internally provided with a mold opening mechanism and a driving assembly used for placing mold closing and mold opening of a mold plate; the piston mechanism is used for driving the injection molding machine body template to be closed and opened; the lubricating assembly is used for lubricating when a piston on the inner wall of the cylinder pipe moves; the oil pushing assembly is used for increasing the lubrication degree of the sealing assembly, so that resistance is reduced, and smoothness is improved; the mold opening mechanism comprises a cylinder pipe, the cylinder pipe is arranged in the oil cylinder cover, and the left side of the cylinder pipe is fixedly connected with a left cover. According to the piston ring, the concave shape is formed in the outer side wall of the piston ring, the bevel faces are arranged on the opposite vertical faces of the concave shape, the bevel faces face inwards, the contact face of the whole piston ring and the cylinder wall is reduced on the premise that normal work of the piston ring is not affected, and therefore friction force is reduced.

Description

Technical Field

[0001] The invention relates to the field of injection molding machine pistons, and in particular to a steel ring sealing structure for an injection molding machine oil cylinder piston. Background Art

[0002] Injection molding machine is a mechanical equipment used for plastic molding. It heats the plastic raw material, melts it, and injects it into the mold cavity. After cooling and solidification, the plastic product of the desired shape is obtained. Injection molding machine is widely used in automobile, home appliance, electronics, medical and other industries, and is one of the indispensable equipment in the production of plastic products.

[0003] In the injection molding industry, the sealing performance of the oil cylinder piston is directly related to the operating efficiency and stability of the injection molding machine. With the continuous development of injection molding technology, the requirements for the sealing structure of the oil cylinder piston are also increasing. After a lot of searches, it is found that in the prior art, the cross-section of the general injection molding machine piston steel ring is circular, rectangular or single-sided trapezoidal, but such a cross-section makes the contact surface between the piston ring and the cylinder wall larger, and the friction is larger under long-term high-intensity work, which makes the resistance larger and the wear resistance worse. In addition, it does not have the function of self-lubrication, resulting in a decrease in its service life, which is difficult to meet the high efficiency, high precision and long life requirements of modern injection molding machines. Summary of the invention

[0004] In order to make up for the above deficiencies, the present invention provides a steel ring sealing structure for an injection molding machine cylinder piston, aiming to improve the problems of "poor sealing and insufficient lubrication" mentioned in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a steel ring sealing structure for an injection molding machine cylinder piston, comprising an injection molding machine body, a cylinder cover is arranged near the left side of the middle of the injection molding machine body, and the inside of the cylinder cover is provided with:

[0006] The mold opening mechanism is used to place the driving components for mold closing and mold opening;

[0007] The piston mechanism is used to drive the mold closing and opening of the injection molding machine template;

[0008] Lubrication assembly, used for lubrication of the piston when it moves against the inner wall of the cylinder tube;

[0009] The oil push assembly is used to increase the lubrication of the sealing assembly, thereby reducing resistance and increasing fluidity;

[0010] The mold opening mechanism comprises:

[0011] A cylinder tube, the cylinder tube is arranged inside the oil cylinder cover, the left side of the cylinder tube is fixedly connected with a left cover, and the right side of the cylinder tube is fixedly connected with a right cover;

[0012] There are multiple oil ports, and the oil ports are respectively opened on the top of the left cover and the right cover;

[0013] The piston rod is arranged inside the left cover, the right cover and the cylinder tube to provide a motion travel trajectory for the piston mechanism.

[0014] As a further description of the above technical solution:

[0015] The piston mechanism includes a piston block, which is arranged on the outer wall of the piston rod. The outer wall of the piston block is provided with a piston ring. The outer side of the piston ring is arranged in a concave shape, and the outermost end of the concave shape is provided with an angled surface, and the two angled surfaces are opposite to each other.

[0016] As a further description of the above technical solution:

[0017] A cone block is fixedly connected to the left side of the piston block, and the end of the cone block with a smaller contact surface is far away from the outside of the piston block. A spring sheet is also arranged on the outer wall of the piston block, and two groups of piston rings are arranged, and their notches are not in the same plane.

[0018] As a further description of the above technical solution:

[0019] A cavity is provided on the left side of the piston block, and a cover plate is detachably mounted on the inner wall of the cavity close to one end of the outer side.

[0020] As a further description of the above technical solution:

[0021] The lubrication assembly includes a sponge ring, which is installed inside the concave shape of the outer side of the piston ring through a fixing block. The inner side wall of the piston ring passes through and is fixedly connected to a ring tube 1, the outer side wall of the piston block passes through and is fixedly connected to a ring tube 2, and the inner wall at the top of the ring tube 2 is fixedly connected to a rubber ring.

[0022] As a further description of the above technical solution:

[0023] The annular tube 1 is configured as a flat-top cone, with an upper opening having a smaller diameter than a lower opening, while the annular tube 2 is configured as an inverted flat-top cone, with an upper opening having a larger diameter than a lower opening.

[0024] As a further description of the above technical solution:

[0025] The lubrication assembly also includes an oil outlet pipe, which is fixedly mounted on the outer side wall of the piston ring and communicated with the ring pipe.

[0026] As a further description of the above technical solution:

[0027] The oil pushing assembly includes a push rod, which passes through and is slidably connected to the middle part of the cover plate and the middle and upper part of the cone block. The inner wall of the cone block is fixedly connected with a circular ring block. The push rod passes through and is slidably connected to the middle part of the circular ring block. The push rod and the cover plate are elastically connected by a spring, one end of the spring is fixedly connected to the left side of the cover plate, and the other end of the spring is fixedly connected to the outer wall of the push rod.

[0028] As a further description of the above technical solution:

[0029] A stopper is fixedly connected to the inner wall close to the left part of the cylinder tube, a push block is fixedly connected to the right side of the push rod, and an oil inlet pipe is arranged on the left side of the cover plate.

[0030] A method for using a steel ring sealing structure for an injection molding machine oil cylinder piston comprises the following steps:

[0031] S1: First, connect the oil port with other parts of the injection molding machine. Then, start the injection molding machine so that the hydraulic oil enters the cylinder tube through the oil port. When the hydraulic oil enters the cylinder tube through the oil port, the piston block is driven to move linearly in the cylinder tube to achieve mold closing or mold opening operation of the template.

[0032] S2: When the piston block moves to the left and the push rod contacts the stopper, it will be pressed to move to the right. When moving, the push rod will slide horizontally in the middle of the circular ring block and the upper middle of the cover plate, and will compress the spring. In addition, when the push rod moves, it drives the push block to move together to squeeze the lubricating oil inside the cavity, so that the lubricating oil enters the ring tube one through the ring tube two, and then enters the oil outlet pipe from the ring tube one, and finally enters the sponge ring through the outlet of the oil outlet pipe and is absorbed by the sponge ring. The lubricating oil enters between the two beveled surfaces on the outside of the piston ring through the adsorption and emission properties of the sponge ring to increase lubrication, thereby reducing resistance and increasing durability. When the piston block moves in the opposite direction, the push rod and the push block are reset by the reverse force of the spring.

[0033] S3: During the installation phase, when installing the piston ring, first put one end of the piston ring notch on the piston block, and slightly deform the piston ring through the micro-deformation characteristics of the piston ring, so that the other end is wrapped around the piston block. During installation, the ring tube 1 needs to be aligned with the ring tube 2 and inserted into the ring tube 2. The outer wall of the ring tube 1 is squeezed by the rubber ring to increase the sealing between the ring tubes 1 and 2. Similarly, the spring sheet can be installed on the piston block.

[0034] The present invention has the following beneficial effects:

[0035] 1. In the present invention, a concave shape is provided on the outer wall of the piston ring, and beveled surfaces are provided on the opposite sides of the concave shape, with the beveled surfaces facing inward, so that the contact surface between the whole and the cylinder wall is reduced without affecting its normal work, thereby reducing the friction. In addition, a cavity is provided in the piston block to reduce the overall weight of the piston block and a conical cone block is provided to reduce the resistance encountered by the piston block during movement, further reducing the friction of the piston block during operation, thereby increasing the durability of the piston block.

[0036] 2. In the present invention, by setting up the oil push assembly, dynamic lubrication is achieved during the movement of the piston, which significantly improves the lubrication effect between the sealing structure and the inner wall of the cylinder tube. When the push rod is pushed to the right by the piston block, not only the spring is compressed, but also the lubricating oil in the cavity is squeezed by the push block, so that the lubricating oil is transported to the sponge ring through the ring tube system and is effectively adsorbed. This innovative design not only ensures that the lubricating oil can be evenly and continuously distributed between the piston ring and the inner wall of the cylinder tube, but also prolongs the lubrication effect through the slow release effect of the sponge ring, reducing the wear and leakage problems caused by insufficient lubrication.

[0037] 3. In the present invention, the connection between the ring tube 1 and the ring tube 2 adopts a precise plug-in fit, and is sealed with a rubber ring to ensure that the lubricating oil does not leak during the transmission process. At the same time, the flat-top cone design of the ring tube 1 and the inverted flat-top cone design of the ring tube 2 not only facilitate the smooth flow of the lubricating oil, but also further improve the lubricating oil delivery efficiency through the change in shape, so that the lubricating oil can reach the lubrication point more quickly. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a three-dimensional schematic diagram of the overall device of a steel ring sealing structure for an injection molding machine oil cylinder piston in the present invention;

[0039] Figure 2 It is a schematic diagram of the partial three-dimensional structure of an injection molding machine body of a steel ring sealing structure for an injection molding machine cylinder piston in the present invention;

[0040] Figure 3 It is a schematic diagram of the three-dimensional structure of a mold opening component of a steel ring sealing structure for an injection molding machine cylinder piston in the present invention;

[0041] Figure 4 It is a schematic diagram of the three-dimensional structure of a piston block of a steel ring sealing structure for an injection molding machine oil cylinder piston in the present invention;

[0042] Figure 5 It is a schematic diagram of the disassembled three-dimensional structure of the piston block and the cone block of a steel ring sealing structure for an injection molding machine oil cylinder piston in the present invention;

[0043] Figure 6A schematic diagram of the three-dimensional structure of a piston ring of a steel ring sealing structure for an injection molding machine oil cylinder piston in the present invention;

[0044] Figure 7 The invention relates to a steel ring sealing structure for a piston of an injection molding machine oil cylinder. Figure 6 The enlarged schematic diagram of part A in the middle;

[0045] Figure 8 It is a schematic diagram of the disassembled three-dimensional structure of a piston ring and a sponge ring of a steel ring sealing structure for an oil cylinder piston of an injection molding machine in the present invention;

[0046] Fig. 9 It is a schematic diagram of the disassembly of the piston block and the cover plate three-dimensional structure of a steel ring sealing structure for an injection molding machine oil cylinder piston in the present invention;

[0047] Fig.10 It is a schematic diagram of the disassembled three-dimensional structure of a piston block and a push block of a steel ring sealing structure for an oil cylinder piston of an injection molding machine in the present invention;

[0048] Fig.11 The invention relates to a steel ring sealing structure for a piston of an injection molding machine oil cylinder. Fig.10 The enlarged schematic diagram of part B in the middle;

[0049] Fig.12 The present invention is a schematic cross-sectional view of the three-dimensional structure of a cylinder tube of a steel ring sealing structure for an injection molding machine oil cylinder piston.

[0050] Legend:

[0051] 1. Injection molding machine body; 21. Left cover; 22. Piston rod; 23. Right cover; 24. Oil port; 25. Cylinder tube; 31. Piston block; 32. Cone block; 33. Bevel surface; 34. Cover plate; 35. Cavity; 36. Piston ring; 41. Fixed block; 42. Ring tube one; 43. Rubber ring; 44. Oil outlet pipe; 45. Ring tube two; 46. Sponge ring; 51. Push rod; 52. Ring block; 53. Spring; 54. Push block; 55. Stopper; 6. Spring sheet. DETAILED DESCRIPTION

[0052] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0053] Example:

[0054] Reference Figure 1 - Fig.12The present invention provides a steel ring sealing structure for an injection molding machine cylinder piston, including an injection molding machine body 1, the injection molding machine body 1 is a prior art, and constitutes the main structure of the injection molding machine, and a cylinder cover is arranged near the left side of the middle of the injection molding machine body 1. The design of the cylinder cover enables the internal space to accommodate multiple functional components to ensure the normal operation of the injection molding machine body 1. The interior of the cylinder cover is provided with:

[0055] The mold opening mechanism is used to place the driving components for mold closing and mold opening;

[0056] A piston mechanism is used to drive the mold closing and opening of the mold plate of the injection molding machine body 1;

[0057] A lubrication assembly, used for lubricating the piston when it moves with the inner wall of the cylinder tube 25;

[0058] The oil push assembly is used to increase the lubrication of the sealing assembly, thereby reducing resistance and increasing fluidity;

[0059] The mold opening mechanism includes:

[0060] The cylinder tube 25 is arranged inside the oil cylinder cover, the left side of the cylinder tube 25 is fixedly connected to the left cover 21, and the right side of the cylinder tube 25 is fixedly connected to the right cover 23;

[0061] There are multiple oil ports 24, and the oil ports 24 are respectively opened on the top of the left cover 21 and the right cover 23;

[0062] The piston rod 22 is disposed inside the left cover 21, the right cover 23 and the cylinder tube 25 to provide a motion trajectory for the piston mechanism.

[0063] Reference Figure 1 - Fig.12 The piston mechanism includes a piston block 31, which is arranged on the outer wall of the piston rod 22. The outer wall of the piston block 31 is provided with a piston ring 36. The piston ring 36 itself has the characteristic of micro-deformation. Most of its materials are high-carbon steel or alloy steel. After precision machining, the surface is specially treated to improve wear resistance and lubricity. In the present invention, the outer wall of the piston ring 36 is provided with a concave shape to reduce the direct contact area with the inner wall of the cylinder tube 25, thereby increasing the durability of the piston block 31. The outer side of the piston ring 36 is provided with a concave shape, and the outermost end of the concave shape is provided with There is an angled surface 33, and the two inclined surfaces are opposite to each other, thereby reducing the direct contact area between the piston ring 36 and the inner wall of the cylinder tube 25. A cone block 32 is fixedly connected to the left side of the piston block 31, and the end of the cone block 32 with a smaller contact surface is away from the outside of the piston block 31, so that the piston block 31 reduces the contact area with the air during movement, thereby reducing resistance. The outer wall of the piston block 31 is also provided with a spring sheet 6. The spring sheet 6 is a basic accessory of the piston block 31 and is a prior art, so it will not be described in detail in this case. There are two groups of piston rings 36, and their notches are not in the same plane.

[0064] Reference Figure 1 - Fig.12 A cavity 35 is provided on the left side of the piston block 31. The cavity 35 can not only be used to place lubricating oil, but also can reduce the overall weight of the piston block 31, thereby reducing friction and further increasing durability. A cover plate 34 is detachably installed on the inner wall of the cavity 35 near the outer end.

[0065] Reference Figure 1 - Fig.12 The lubrication assembly includes a sponge ring 46, which is made of sponge material and has the functions of adsorption and release, and slowly releases the lubricating oil between the piston rings 36. The sponge ring 46 is installed inside the concave shape on the outer side of the piston ring 36 through the fixing block 41, and the fixing block 41 is detachably installed, which is convenient for removing the fixing block 41 for cleaning and replacement. The inner wall of the piston ring 36 passes through and is fixedly connected with a ring tube 1 42, and the outer wall of the piston block 31 passes through and is fixedly connected with a ring tube 2 45. The inner wall of the top of the ring tube 2 45 is fixedly connected with a rubber ring 43. The rubber ring 43 has the characteristic of deformation, thereby increasing the sealing between the ring tube 1 42 and the ring tube 2 45. The ring tube 1 42 is set as a flat-top cone The ring tube 1 42 and the ring tube 2 45 are designed to be structurally complementary. The flat-top cone design of the ring tube 1 42 enables it to have higher stability when subjected to pressure, while the inverted flat-top cone design of the ring tube 2 45 enables it to exhibit excellent performance when subjected to tension. This structural difference enables the two to give full play to their respective advantages in practical applications and improve the performance of the overall equipment. The lubrication assembly also includes an oil outlet pipe 44, which is in contact with the sponge ring 46. The oil outlet pipe 44 is fixedly mounted on the outer wall of the piston ring 36 and is communicated with the ring tube 1 42.

[0066] Reference Figure 1 - Fig.12 The oil pushing assembly includes a push rod 51, which passes through and is slidably connected to the middle part of the cover plate 34 and the middle and upper part of the cone block 32. The inner wall of the cone block 32 is fixedly connected with a circular ring block 52. The push rod 51 passes through and is slidably connected to the middle part of the circular ring block 52. The push rod 51 and the cover plate 34 are elastically connected by a spring 53, and the spring 53 plays a connecting and supporting role for the push rod 51. One end of the spring 53 is fixedly connected to the left side of the cover plate 34, and the other end of the spring 53 is fixedly connected to the outer wall of the push rod 51. A stopper 55 is fixedly connected to the inner wall near the left part of the cylinder tube 25. When the push rod 51 contacts and squeezes the stopper 55, it will move and squeeze the push block 54, thereby squeezing the lubricating oil in the cavity 35 of the piston block 31. The right side of the push rod 51 is fixedly connected with a push block 54, and the left side of the cover plate 34 is provided with an oil inlet pipe, which is convenient for adding lubricating oil to the cavity 35.

[0067] The present invention also provides a method for using a steel ring sealing structure for an injection molding machine oil cylinder piston, which is characterized by comprising the following steps:

[0068] S1: First, the oil port 24 is connected to other accessories of the injection molding machine body 1. At this time, the injection molding machine body 1 can be started, so that the hydraulic oil enters the cylinder tube 25 through the oil port 24. When the hydraulic oil enters the cylinder tube 25 through the oil port 24, the piston block 31 is driven to perform linear motion in the cylinder tube 25 to achieve mold closing or mold opening operation of the template;

[0069] S2: When the piston block 31 moves to the left and the push rod 51 contacts the stopper 55, it will be pressed to move to the right, and when moving, the push rod 51 will slide horizontally in the middle of the circular ring block 52 and the upper middle of the cover plate 34, and will compress the spring 53. In addition, when the push rod 51 moves, it drives the push block 54 to move together to squeeze the lubricating oil inside the cavity 35, so that the lubricating oil enters the ring tube 1 42 through the ring tube 2 45, and then enters the oil outlet pipe 44 from the ring tube 1 42, and finally enters the sponge ring 46 through the outlet of the oil outlet pipe 44 and is absorbed by the sponge ring 46. The lubricating oil enters between the two beveled surfaces 33 on the outside of the piston ring 36 through the adsorption and dispersibility of the sponge ring 46 to increase lubrication, thereby reducing resistance and increasing durability. When the piston block 36 moves in the opposite direction, the push rod 51 and the push block 54 are reset by the reverse force of the spring 53.

[0070] S3: During the installation phase, when installing the piston ring 36, firstly, one end of the notched portion of the piston ring 36 is put on the piston block 31, and the piston ring 36 is slightly deformed by the micro-deformable characteristic of the piston ring 36, so that the other end is wrapped around the piston block 31, and during installation, the ring tube 1 42 needs to be aligned with the ring tube 2 45 and inserted into the ring tube 2 45, and the outer wall of the ring tube 1 42 is squeezed by the rubber ring 43 to increase the sealing between the ring tube 1 42 and the ring tube 2 45, and similarly, the spring sheet 6 can be installed on the piston block 31.

[0071] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A steel ring sealing structure for an injection molding machine cylinder piston, comprising an injection molding machine body (1), a cylinder cover disposed near the left side of the middle of the injection molding machine body (1), characterized in that: The interior of the oil cylinder cover is provided with: The mold opening mechanism is used to place the driving components for mold closing and mold opening; A piston mechanism is used to drive the mold closing and opening of the mold plate of the injection molding machine (1); A lubrication assembly, used for lubricating the piston when it moves with the inner wall of the cylinder tube (25); The oil push assembly is used to increase the lubrication of the sealing assembly, thereby reducing resistance and increasing fluidity; The mold opening mechanism comprises: A cylinder tube (25), wherein the cylinder tube (25) is arranged inside the oil cylinder cover, the left side of the cylinder tube (25) is fixedly connected to a left cover (21), and the right side of the cylinder tube (25) is fixedly connected to a right cover (23); There are multiple oil ports (24), and the oil ports (24) are respectively opened on the top of the left cover (21) and the top of the right cover (23); The piston rod (22) is arranged inside the left cover (21), the right cover (23) and the cylinder tube (25) to provide a movement trajectory for the piston mechanism.

2. A steel ring sealing structure for an injection molding machine cylinder piston according to claim 1, characterized in that: The piston mechanism comprises a piston block (31), wherein the piston block (31) is arranged on the outer wall of the piston rod (22), and a piston ring (36) is arranged on the outer wall of the piston block (31), and the outer side of the piston ring (36) is arranged in a concave shape, and an oblique angle surface (33) is arranged at the outermost end of the concave shape, and the two oblique surfaces are opposite to each other.

3. A steel ring sealing structure for an injection molding machine cylinder piston according to claim 2, characterized in that: A cone block (32) is fixedly connected to the left side of the piston block (31), and the end of the cone block (32) with a smaller contact surface is away from the outside of the piston block (31). The outer wall of the piston block (31) is also provided with a spring sheet (6), and two groups of piston rings (36) are provided, and their notches are not in the same plane.

4. A steel ring sealing structure for an injection molding machine cylinder piston according to claim 3, characterized in that: A cavity (35) is provided on the left side of the piston block (31), and a cover plate (34) is detachably mounted on the inner wall of the cavity (35) close to one end of the outer side.

5. The steel ring sealing structure for the oil cylinder piston of an injection molding machine according to claim 2, characterized in that: The lubrication assembly comprises a sponge ring (46), which is installed inside the concave shape of the outer side of the piston ring (36) through a fixing block (41); a ring tube 1 (42) is passed through and fixedly connected to the inner side wall of the piston ring (36); a ring tube 2 (45) is passed through and fixedly connected to the outer side wall of the piston block (31); and a rubber ring (43) is fixedly connected to the inner wall of the top of the ring tube 2 (45).

6. The steel ring sealing structure for the oil cylinder piston of an injection molding machine according to claim 5, characterized in that: The annular tube 1 (42) is configured as a flat-top cone, with an upper opening having a smaller diameter than a lower opening, while the annular tube 2 (45) is configured as an inverted flat-top cone, with an upper opening having a larger diameter than a lower opening.

7. The steel ring sealing structure for the oil cylinder piston of an injection molding machine according to claim 2, characterized in that: The lubrication assembly also includes an oil outlet pipe (44), which is fixedly mounted on the outer wall of the piston ring (36) and communicates with the ring pipe 1 (42).

8. The steel ring sealing structure for the oil cylinder piston of an injection molding machine according to claim 4, characterized in that: The oil pushing assembly comprises a push rod (51), wherein the push rod (51) passes through and is slidably connected to the middle part of the cover plate (34) and the middle and upper part of the cone block (32), the inner wall of the cone block (32) is fixedly connected with a circular ring block (52), the push rod (51) passes through and is slidably connected to the middle part of the circular ring block (52), the push rod (51) and the cover plate (34) are elastically connected via a spring (53), one end of the spring (53) is fixedly connected to the left side of the cover plate (34), and the other end of the spring (53) is fixedly connected to the outer wall of the push rod (51).

9. The steel ring sealing structure for the oil cylinder piston of an injection molding machine according to claim 8, characterized in that: A stopper (55) is fixedly connected to the inner wall near the left part of the cylinder tube (25), a push block (54) is fixedly connected to the right side of the push rod (51), and an oil inlet pipe is arranged on the left side of the cover plate (34).

10. A method for using a steel ring sealing structure for a cylinder piston of an injection molding machine according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: First, the oil port (24) is connected to other accessories of the injection molding machine (1), and then the injection molding machine (1) can be started, so that the hydraulic oil enters the cylinder tube (25) through the oil port (24). When the hydraulic oil enters the cylinder tube (25) through the oil port (24), the piston block (31) is driven to move linearly in the cylinder tube (25), thereby realizing the mold closing or mold opening operation of the mold plate; S2: When the piston block (31) moves to the left and the push rod (51) contacts the stopper (55), it will be pressed to move to the right. When moving, the push rod (51) will slide horizontally in the middle of the annular block (52) and the upper middle of the cover plate (34), and will compress the spring (53). In addition, when the push rod (51) moves, it drives the push block (54) to move together to squeeze the lubricating oil inside the cavity (35), so that the lubricating oil enters the annular tube (42) through the annular tube (45). Then, the oil enters the oil outlet pipe (44) from the annular tube (42) and finally enters the sponge ring (46) through the outlet of the oil outlet pipe (44) and is adsorbed by the sponge ring (46). The lubricating oil enters between the two beveled surfaces (33) on the outside of the piston ring (36) through the adsorption and dispersibility of the sponge ring (46) to increase lubrication, thereby reducing resistance and increasing durability. When the piston block (31) moves in the opposite direction, the reverse force of the spring (53) causes the push rod (51) and the push block (54) to reset. S3: During the installation phase, when installing the piston ring (36), firstly, one end of the notched portion of the piston ring (36) is placed on the piston block (31), and the piston ring (36) is slightly deformed by the micro-deformable characteristic of the piston ring (36), so that the other end is wound around the piston block (31). During installation, the ring tube 1 (42) needs to be aligned with the ring tube 2 (45) and inserted into the ring tube 2 (45). The outer wall of the ring tube 1 (42) is squeezed by the rubber ring (43) to increase the sealing between the ring tube 1 (42) and the ring tube 2 (45). Similarly, the spring sheet (6) can be installed on the piston block (31).

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