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

Abstract

The utility model relates to the technical field of injection molding machine pistons, and discloses a steel ring sealing structure for an injection molding machine oil cylinder piston, which comprises an injection molding machine body, an oil cylinder cover is arranged at a position close to the left side of the middle of the injection molding machine body, and a mold opening mechanism, a piston mechanism, a lubricating assembly and an oil pushing assembly are arranged in the oil cylinder cover. The cylinder pipe is arranged in the oil cylinder cover, the left side of the cylinder pipe is fixedly connected with a left cover, and the right side of the cylinder pipe is fixedly connected with a right cover; the multiple oil ports are formed in the top of the left cover and the top of the right cover correspondingly. And the piston rod is arranged in the left cover, the right cover and the cylinder pipe. According to the piston ring, the outer side wall of the piston ring is provided with the concave shape, the opposite vertical faces of the concave shape are provided with the bevel faces, 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 utility model relates to the field of injection molding machine pistons, in particular to a steel ring sealing structure for an injection molding machine oil cylinder piston. Background Art

[0002] An injection molding machine is a piece of machinery used for plastic molding. It heats the plastic material, melts it, and injects it into a mold cavity. After cooling and solidifying, the resulting plastic product is shaped into the desired shape. Widely used in industries such as automotive, home appliances, electronics, and medical, injection molding machines are an essential piece of equipment in the production of plastic products.

[0003] In the injection molding industry, the sealing performance of the 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 cylinder piston sealing structure are also increasing. After extensive research, it was found that in the existing technology, the cross-section of the general injection molding machine piston steel ring is circular, rectangular or single-sided trapezoidal. However, such a cross-section results in a large contact surface between the piston ring and the cylinder wall. Under long-term and high-intensity operation, the friction is large, the resistance increases, and the wear resistance deteriorates. In addition, it does not have the self-lubricating function, resulting in a shortened service life, which makes it difficult to meet the high efficiency, high precision and long life requirements of modern injection molding machines. Utility Model Content

[0004] In order to make up for the above deficiencies, the utility model provides a steel ring sealing structure for an injection molding machine oil 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 utility model adopts the following technical solution: a steel ring sealing structure for an injection molding machine cylinder piston, comprising an injection molding machine body, a cylinder cover is provided near the left side of the middle of the injection molding machine body, and the interior of the cylinder cover is provided with: a mold opening mechanism, a piston mechanism, a lubrication assembly and an oil pushing assembly, and the mold opening mechanism includes:

[0006] A cylinder tube, the cylinder tube being arranged inside the oil cylinder cover, the left side of the cylinder tube being fixedly connected to the left cover, and the right side of the cylinder tube being fixedly connected to the right cover;

[0007] There are multiple oil ports, and the oil ports are respectively opened on the top of the left cover and the right cover;

[0008] The piston rod is arranged inside the left cover, the right cover and the cylinder tube.

[0009] As a further description of the above technical solution:

[0010] 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 set to 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.

[0011] As a further description of the above technical solution:

[0012] 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 away from the outside of the piston block. A spring sheet is also provided on the outer wall of the piston block, and two groups of piston rings are provided, and their notches are not in the same plane.

[0013] As a further description of the above technical solution:

[0014] 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.

[0015] As a further description of the above technical solution:

[0016] The lubrication assembly includes a sponge ring, which is installed inside the concave shape of the outer side of the piston ring through a fixed 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 of the top of the ring tube 2 is fixedly connected to a rubber ring.

[0017] As a further description of the above technical solution:

[0018] 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.

[0019] As a further description of the above technical solution:

[0020] The lubrication assembly also includes an oil outlet pipe, which is fixedly installed on the outer side wall of the piston ring and is communicated with the ring pipe.

[0021] As a further description of the above technical solution:

[0022] 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 upper and middle 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.

[0023] As a further description of the above technical solution:

[0024] The inner wall close to the left part of the cylinder tube is fixedly connected with a stopper, the right side of the push rod is fixedly connected with a push block, and the left side of the cover plate is provided with an oil inlet pipe.

[0025] The utility model has the following beneficial effects:

[0026] 1. In the utility model, a concave shape is provided on the outer wall of the piston ring, and beveled surfaces are provided on the opposite vertical surfaces of the concave shape, with the beveled surfaces facing inward. The contact surface between the entire piston ring and the cylinder wall is reduced without affecting its normal operation, thereby reducing 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.

[0027] 2. In this utility model, by providing an oil push assembly, dynamic lubrication is achieved during piston movement, significantly improving 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, it not only compresses the spring, but also squeezes the lubricating oil in the cavity through the push block, so that the lubricating oil is transported to the sponge ring through the ring pipe system and effectively absorbed. 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 wear and leakage problems caused by insufficient lubrication.

[0028] 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

[0029] Figure 1 This is a three-dimensional schematic diagram of the overall device of a steel ring sealing structure for an injection molding machine cylinder piston in the utility model;

[0030] Figure 2 This 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 utility model;

[0031] Figure 3 This is a schematic diagram of the three-dimensional structure of a mold opening assembly of a steel ring sealing structure for an injection molding machine cylinder piston in the utility model;

[0032] Figure 4 This 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 utility model;

[0033] Figure 5 This is a schematic diagram of the exploded three-dimensional structure of the piston block and cone block of a steel ring sealing structure for an injection molding machine oil cylinder piston in the utility model;

[0034] Figure 6 This is a 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 utility model;

[0035] Figure 7 This utility model is a steel ring sealing structure for the oil cylinder piston of an injection molding machine. Figure 6 A magnified schematic diagram of part A;

[0036] Figure 8 This is a schematic diagram of the exploded three-dimensional structure of the piston ring and sponge ring of a steel ring sealing structure for an injection molding machine oil cylinder piston in the utility model;

[0037] Figure 9 This is a schematic diagram of the exploded three-dimensional structure of the piston block and cover plate of a steel ring sealing structure for an injection molding machine oil cylinder piston in the utility model;

[0038] Figure 10 This is a schematic diagram of the exploded three-dimensional structure of the piston block and the push block of a steel ring sealing structure for an injection molding machine oil cylinder piston in the utility model;

[0039] Figure 11 This utility model is a steel ring sealing structure for the oil cylinder piston of an injection molding machine. Figure 10 A magnified schematic diagram of part B;

[0040] Figure 12 The utility model 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.

[0041] Legend:

[0042] 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. Fixing block; 42. Ring tube 1; 43. Rubber ring; 44. Oil outlet pipe; 45. Ring tube 2; 46. Sponge ring; 51. Push rod; 52. Ring block; 53. Spring; 54. Push block; 55. Stopper; 6. Spring sheet. DETAILED DESCRIPTION

[0043] 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 embodiments described 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 making creative efforts are within the scope of protection of the present invention.

[0044] Reference Figure 1 - Figure 12 The utility model provides a steel ring sealing structure for an injection molding machine oil cylinder piston, including an injection molding machine body 1, which is the existing technology and constitutes the main structure of the injection molding machine. 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. A mold opening mechanism, a piston mechanism, a lubrication assembly and an oil pushing assembly are arranged inside the cylinder cover. The mold opening mechanism includes a cylinder tube 25, which is arranged inside the 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; 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; the piston rod 22 is arranged inside the left cover 21, the right cover 23 and the cylinder tube 25, providing a motion stroke trajectory for the piston mechanism.

[0045] Reference Figure 1 - Figure 12 The piston mechanism includes a piston block 31, which is arranged on the outer wall of the piston rod 22. A piston ring 36 is arranged on the outer wall of the piston block 31. The piston ring 36 itself has the characteristic of micro-deformation. Most of its materials are high-carbon steel or alloy steel. After precision processing, the surface is specially treated to improve wear resistance and lubricity. In this case, the outer wall of the piston ring 36 is set in 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 set in a concave shape, and the outermost end of the concave shape is provided with an inclined Angle 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. The left side of the piston block 31 is fixedly connected to the cone block 32, 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.

[0046] Reference Figure 1 - Figure 12A 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 removably installed on the inner wall of the cavity 35 near the outer end.

[0047] Reference Figure 1 - Figure 12 The lubrication assembly includes a sponge ring 46. The sponge ring 46 is made of sponge material and has the functions of adsorption and release, slowly releasing the lubricating oil between the piston rings 36. The sponge ring 46 is installed inside the concave shape of the outer side of the piston ring 36 through the fixing block 41, and the fixing block 41 is detachable, which makes it convenient to remove the fixing block 41 for cleaning and replacement. The inner wall of the piston ring 36 passes through and is fixedly connected to a ring tube 1 42, and the outer wall of the piston block 31 passes through and is fixedly connected to a ring tube 2 45. The inner wall of the top of the ring tube 2 45 is fixedly connected to a rubber ring 43. The rubber ring 43 has the characteristics 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. shaped, with the upper opening diameter being smaller than the lower opening, while the ring tube 2 45 is set to an inverted flat-top cone, with the upper opening diameter being larger than the lower opening. The design of the ring tubes 1 42 and 45 makes them complementary in structure. The flat-top cone design of the ring tube 1 42 makes it have higher stability when subjected to pressure, while the inverted flat-top cone design of the ring tube 2 45 makes it exhibit excellent performance when subjected to tension. This structural difference enables the two to play 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.

[0048] Reference Figure 1 - Figure 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 to 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 push rod 51 and the cover plate 34 are elastically connected by the spring 53. 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 to the 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.

[0049] Working principle: When in use, first connect the oil port 24 to other accessories of the injection molding machine body 1, then start the injection molding machine body 1, 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, it drives the piston block 31 to move linearly in the cylinder tube 25, realizing the mold closing or mold opening operation;

[0050] When the piston block 31 moves to the left, the push rod 51 contacts the stopper 55 and moves to the right under pressure. When moving, the push rod 51 slides horizontally between the middle part of the circular ring block 52 and the upper middle part of the cover plate 34, and compresses 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 pipe 1 42 through the ring pipe 2 45, and then enters the oil outlet pipe 44 from the ring pipe 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 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.

[0051] During the installation stage, when installing the piston ring 36, first put one end of the notch of the piston ring 36 on the piston block 31, and slightly deform the piston ring 36 through the micro-deformation characteristics of the piston ring 36, so that the other end is wrapped around the piston block 31, and during installation, it is necessary to align the ring tube 1 42 with the ring tube 2 45 and insert it into the ring tube 2 45, and use the rubber ring 43 to squeeze the outer wall of the ring tube 1 42 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.

[0052] 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, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection 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 portion of the injection molding machine body (1), and characterized in that: The interior of the oil cylinder cover is provided with: a mold opening mechanism, a piston mechanism, a lubrication component and an oil pushing component, and the mold opening mechanism includes: A cylinder tube (25), the cylinder tube (25) being arranged inside the oil cylinder cover, the left side of the cylinder tube (25) being fixedly connected to the left cover (21), and the right side of the cylinder tube (25) being fixedly connected to the 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 right cover (23); The piston rod (22) is arranged inside the left cover (21), the right cover (23) and the cylinder tube (25).

2. The 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 surface (33) is arranged at the outermost end of the concave shape, and the two oblique surfaces are opposed to each other.

3. The steel ring sealing structure for an injection molding machine cylinder piston according to claim 2, characterized in that: The left side of the piston block (31) is fixedly connected to a cone block (32), 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. The 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) near one end of the outer side.

5. The steel ring sealing structure for an injection molding machine cylinder piston according to claim 2, characterized in that: The lubrication assembly includes 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), and the inner side wall of the piston ring (36) is penetrated and fixedly connected with a ring tube 1 (42), and the outer side wall of the piston block (31) is penetrated and fixedly connected with a ring tube 2 (45), and the inner wall of the top of the ring tube 2 (45) is fixedly connected with a rubber ring (43).

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

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

8. The steel ring sealing structure for an injection molding machine cylinder piston according to claim 4, characterized in that: The oil pushing assembly includes a push rod (51), 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 by 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 an injection molding machine cylinder piston according to claim 8, characterized in that: A stopper (55) is fixedly connected to the inner wall near the left portion 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 provided on the left side of the cover plate (34).

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