Self-lubricating center ejector rod structure of injection mold

Abstract

The invention relates to the technical field of injection molds, in particular to a self-lubricating center ejector rod structure of an injection mold, which comprises a bracket, a plurality of support legs are mounted on the bracket, a lower mold assembly is mounted on the plurality of support legs, an upper mold assembly is arranged right above the lower mold assembly, and the top of the upper mold assembly is fixed with the bracket; an ejector rod assembly used for ejecting a formed product out is arranged in the lower die assembly, a lubricating assembly used for lubricating the ejector rod assembly is arranged on the support, and the liquid outlet end of the lubricating assembly penetrates through and extends into the lower die assembly. According to the device, through the arranged lubricating assembly, the quality of an injection product is remarkably improved, the ejector rod works in a lubricating state, movement of the ejector rod is more stable and accurate, the influence of extra pressure generated by friction on the product is avoided, the size precision, the appearance quality and the internal structure of the injection product are remarkably improved, and the service life of the injection product is prolonged. And the requirements of the market on high-quality injection molding products are met.

Description

Technical Field

[0001] The invention relates to the technical field of injection molds, in particular to a self-lubricating central ejector rod structure of an injection mold. Background Art

[0002] Injection mold is a tool for producing plastic products. It is also a tool that gives plastic products a complete structure and precise size. The principle of injection mold is to inject molten plastic material into the mold cavity under high pressure, and obtain the required plastic product after cooling and solidification. The product after injection molding needs to be demolded. The commonly used demolding methods are manual demolding and ejection demolding; However, the manual demoulding method has too high technical requirements on the operator, and the product may be damaged easily if not carefully. The ejection demoulding method mostly adopts pneumatic or hydraulic ejection method, and also needs to be equipped with corresponding air source or hydraulic station and other equipment, which increases the investment cost of the equipment.

[0003] Therefore, those skilled in the art provide a self-lubricating center ejector pin structure for an injection mold to solve the problems raised in the above background technology. Summary of the invention

[0004] The object of the present invention is to provide a self-lubricating center ejector rod structure for an injection mold to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solutions: A self-lubricating central ejector structure of an injection mold, comprising a bracket, a plurality of legs are mounted on the bracket, a lower mold assembly is mounted on the plurality of legs, an upper mold assembly is arranged directly above the lower mold assembly, and the top of the upper mold assembly is fixed to the bracket, an ejector assembly for ejecting a molded product is arranged in the lower mold assembly, a lubricating assembly for lubricating the ejector assembly is arranged on the bracket, and a liquid outlet end of the lubricating assembly penetrates and extends into the lower mold assembly; The upper mold assembly includes an upper mold body, and an L-shaped support plate for lifting the ejector assembly upward is installed on one side of the upper mold body. The bottom of the L-shaped support plate extends to the bottom of the lower mold assembly, and the L-shaped support plate is connected to the lubrication assembly.

[0006] Preferably, the lower mold assembly comprises a lower mold body, a molding cavity is formed on the top of the lower mold body, and a plurality of positioning grooves for assisting the lower mold assembly and the upper mold assembly to close are formed on the top of the lower mold body.

[0007] Preferably: a limiting cavity is provided inside the lower mold body, and the limiting cavity is located at the center of the molding cavity; a lubrication cavity is also provided inside the lower mold body, and the lubrication cavity is communicated with the limiting cavity; Two connecting pipes are also installed on the side wall of the lower mold body. A connecting hole connected with the two connecting pipes is opened inside the lower mold body, and the connecting hole is connected with the lubrication cavity.

[0008] Preferably: the upper mold assembly includes an upper mold body, a hydraulic rod is arranged above the upper mold body, the top of the hydraulic rod is installed on the bracket, the output end of the hydraulic rod is fixed to the upper mold body, and two groups of auxiliary support rods for assisting the movement of the upper mold body are also installed on the top of the upper mold body.

[0009] Preferably, the top of the upper mold body is also provided with an injection port, the upper mold body is provided with an injection hole connected with the injection port, and the bottom of the injection hole is connected with the molding cavity; A plurality of positioning blocks are installed on one side of the upper mold body close to the lower mold body, and the plurality of positioning blocks correspond one to one with the plurality of positioning grooves on the lower mold body.

[0010] Preferably, the push rod assembly comprises a push rod body, the push rod body is slidably arranged in the lubrication cavity, a push plate is installed on the top of the push rod body, the push plate is clamped in the limit cavity on the lower mold body, and an abutment plate is installed on one end of the push rod body away from the push plate, and the abutment plate is located directly above the extended end of the L-shaped support plate; Two sealing oil retaining rings are slidably sleeved on the outer surface of the push rod body located in the lower mold body. The two sealing oil retaining rings are respectively fixedly connected to the inner walls at both ends of the lubrication cavity. A pressure spring is also sleeved on the outer surface of the push rod body. One end of the pressure spring is fixed to the abutment plate, and the other end is fixed to the bottom of the lower mold body.

[0011] Preferably: the lubrication assembly comprises a first oil storage tank and a second oil storage tank, the first oil storage tank and the second oil storage tank are both mounted on the bracket, and the first oil storage tank and the second oil storage tank are respectively arranged on both sides of the L-shaped support plate, a piston cylinder is arranged in each of the first oil storage tank and the second oil storage tank, a piston rod is installed in each of the two piston cylinders, and the installation directions of the piston rods in the two piston cylinders are opposite, lubricating oil is arranged in each of the two piston cylinders, and a slide groove is provided on a side of the first oil storage tank close to the L-shaped support plate; The first oil storage tank and the second oil storage tank are both provided with oil outlets, and the two oil outlets are both connected with oil delivery pipes, and the two oil delivery pipes are respectively connected with adjacent connecting pipes.

[0012] Preferably: a second connecting rod is installed on one side of the L-shaped support plate close to the first oil storage tank, the second connecting rod is slidably arranged in the slide groove, and the second connecting rod is fixed to the piston rod in the first oil storage tank through the slide groove; A first connecting rod is installed on one side of the L-shaped support plate close to the second oil storage tank, and the first connecting rod is fixed to the piston rod in the second oil storage tank.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention significantly improves the quality of injection molded products by setting up a lubrication component. By making the ejector rod work in a lubricated state, its movement is more stable and accurate, avoiding the influence of additional pressure caused by friction on the product. This makes the injection molded product significantly improved in dimensional accuracy, appearance quality and internal structure, meeting the market demand for high-quality injection molded products.

[0014] 2. The present invention realizes the recycling and precise control of lubricating oil by arranging a structure connected to the lubrication component on the L-shaped support plate. Through the ingenious mechanical linkage design, the L-shaped support plate can simultaneously push the piston rods on both sides when moving upward. One side injects the lubricating oil into the lubrication cavity to lubricate the push rod, and the other side extracts the excess lubricating oil. This design not only saves the amount of lubricating oil used and reduces the cost of use, but also maintains the cleanliness of the mold and further extends the service life of the mold.

[0015] 3. The present invention sets a linkage movement mode between the ejector assembly and the upper mold assembly, so that when the upper mold assembly moves upward and opens, the ejector assembly can be automatically driven to push out the molded product. The structure is relatively simple, which is not only conducive to the installation and maintenance of the mold, but also improves the applicability and flexibility of the mold. The maintenance and maintenance of the mold also become easier, reducing the production cost. At the same time, after the product is pushed out, the upper mold body and the lower mold body of the mold can be closed again under the action of the hydraulic rod, and the ejector and other components also automatically rebound and reset under the action of the pressure spring. This design not only simplifies the operation process, but also improves the continuous production capacity and stability of the mold, and reduces the failure rate caused by improper human operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the first viewing angle of the present invention; Figure 2 It is a second viewing angle schematic diagram of the present invention; Figure 3 It is a structural schematic diagram of the lower mold body in the present invention; Figure 4 It is a front cross-sectional view of the lower mold body of the present invention; Figure 5 It is a schematic diagram of the connection between the upper mold body and the first oil storage tank in the present invention; Figure 6 For the present invention Figure 5 The enlarged schematic diagram of point A in the middle; Figure 7 It is a schematic diagram of the connection between the upper mold body and the second oil storage tank in the present invention.

[0017] In the figure: 1. bracket; 11. support foot; 2. lower mold assembly; 21. lower mold body; 22. molding cavity; 23. positioning groove; 24. connecting pipe; 25. connecting hole; 26. limit cavity; 27. lubrication cavity; 3. upper mold assembly; 31. upper mold body; 32. injection port; 33. hydraulic rod; 34. auxiliary support rod; 35. positioning block; 36. L-shaped support plate; 37. first connecting rod; 38. second connecting rod; 4. lubrication assembly; 41. first oil storage tank; 42. second oil storage tank; 43. piston rod; 44. oil outlet; 45. slide groove; 46. oil pipeline; 5. ejector assembly; 51. ejector body; 52. ejector plate; 53. abutment plate; 54. pressure spring; 55. sealing oil retaining ring. DETAILED DESCRIPTION

[0018] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0019] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0020] For example, see Figure 1-7 A self-lubricating center ejector structure of an injection mold comprises a bracket 1, a plurality of legs 11 are mounted on the bracket 1, a lower mold assembly 2 is mounted on the plurality of legs 11, an upper mold assembly 3 is arranged directly above the lower mold assembly 2, and the top of the upper mold assembly 3 is fixed to the bracket 1, an ejector assembly 5 for ejecting a molded product is arranged in the lower mold assembly 2, a lubricating assembly 4 for lubricating the ejector assembly 5 is arranged on the bracket 1, a liquid outlet end of the lubricating assembly 4 penetrates and extends into the lower mold assembly 2, the upper mold assembly 3 comprises an upper mold body 31, an L-shaped support plate 36 for lifting the ejector assembly 5 upward is mounted on one side of the upper mold body 31, the bottom of the L-shaped support plate 36 extends to the bottom of the lower mold assembly 2, and the L-shaped support plate 36 is connected to the lubricating assembly 4; When using the device, first close the lower mold assembly 2 and the upper mold assembly 3, inject the raw material into the lower mold assembly 2 and the upper mold assembly 3 through the upper mold assembly 3, wait for injection molding, and after molding, adjust the upper mold assembly 3 to separate the upper mold assembly 3 from the lower mold assembly 2. When the upper mold body 31 is separated from the lower mold assembly 2, the L-shaped support plate 36 on the upper mold body 31 drives the ejector assembly 5 to eject the molded tool from the lower mold assembly 2. The worker takes the tool out of the lower mold assembly 2 and proceeds to the next step. When the upper mold body 31 is separated from the lower mold assembly 2, the L-shaped support plate 36 drives the lubrication assembly 4 to work, and the ejector assembly 5 is lubricated by the lubrication assembly 4; By setting up the lubrication component 4, the quality of the injection molded product is significantly improved through the lubrication of the lubrication component 4 during use. By making the ejector assembly 5 work in a lubricated state, its movement is more stable and accurate, avoiding the influence of additional pressure caused by friction on the product.

[0021] For example 2, please refer to Figure 1-4 The lower mold assembly 2 includes a lower mold body 21, a molding cavity 22 is provided on the top of the lower mold body 21, and a plurality of positioning grooves 23 for assisting the lower mold assembly 2 and the upper mold assembly 3 to close are also provided on the top of the lower mold body 21. A limiting cavity 26 is provided inside the lower mold body 21, and the limiting cavity 26 is located at the center of the molding cavity 22. A lubrication cavity 27 is also provided inside the lower mold body 21, and the lubrication cavity 27 is connected to the limiting cavity 26. Two connecting pipes 24 are also installed on the side wall of the lower mold body 21. A connecting hole 25 connected to the two connecting pipes 24 is provided inside the lower mold body 21, and the connecting hole 25 is connected to the lubrication cavity 27. The upper mold The component 3 includes an upper mold body 31, a hydraulic rod 33 is arranged above the upper mold body 31, the top of the hydraulic rod 33 is installed on the bracket 1, the output end of the hydraulic rod 33 is fixed to the upper mold body 31, and two groups of auxiliary support rods 34 for assisting the movement of the upper mold body 31 are also installed on the top of the upper mold body 31. A material injection port 32 is also arranged on the top of the upper mold body 31, and a material injection hole connected to the material injection port 32 is opened in the upper mold body 31, and the bottom of the material injection hole is connected to the molding cavity 22. A plurality of positioning blocks 35 are installed on the side of the upper mold body 31 close to the lower mold body 21, and the plurality of positioning blocks 35 correspond to the plurality of positioning grooves 23 on the lower mold body 21 one by one; When performing injection molding, firstly start the hydraulic rod 33, and use the hydraulic rod 33 to move the upper mold body 31 toward the lower mold body 21, so that the upper mold body 31 and the lower mold body 21 are merged, and the positioning block 35 on the upper mold body 31 is clamped in the positioning groove 23 on the lower mold body 21. After merging, the injection molding material is injected into the upper mold body 31 through the injection port 32, and flows into the molding cavity 22 in the lower mold body 21 through the upper mold body 31, so that the material is completely filled in the molding cavity 22, and waits for the injection molding material to be molded; After the raw material is formed, the hydraulic rod 33 is first started, so that the hydraulic rod 33 drives the upper mold body 31 to move upward and separate from the lower mold body 21, so that the upper mold body 31 is separated from the lower mold body 21. At the same time, when the upper mold body 31 moves upward, the L-shaped support plate 36 provided on the upper mold body 31 moves upward at the same time and pushes the ejector assembly 5, so that the ejector assembly 5 pushes the product formed in the lower mold body 21 out of the molding cavity 22; When 31 drives 36 to move up and down, 36 adjusts the lubrication assembly 4 at the same time, and lubricates the push rod assembly 5 through the lubrication assembly 4, so that the movement of the push rod assembly 5 is more stable.

[0022] For example 3, please refer to Figure 3-7 The push rod assembly 5 includes a push rod body 51, which is slidably arranged in the lubrication cavity 27. A push plate 52 is installed on the top of the push rod body 51, and the top plate 52 is clamped in the limit cavity 26 on the lower mold body 21. An abutment plate 53 is installed at one end of the push rod body 51 away from the top plate 52, and the abutment plate 53 is located directly above the extended end of the L-shaped support plate 36. Two sealing oil retaining rings 55 are also slidably sleeved on the outer surface of the push rod body 51 located in the lower mold body 21. The two sealing oil retaining rings 55 are respectively fixedly connected to the inner walls of the two ends of the lubrication cavity 27. A pressure spring 54 is also sleeved on the outer surface of the push rod body 51, one end of the pressure spring 54 is fixed to the abutment plate 53, and the other end is fixed to the bottom of the lower mold body 21. The lubrication assembly 4 includes a first oil storage tank 41 and a second oil storage tank 42. The first oil storage tank 41 and the second oil storage tank 42 are both installed on the bracket 1, and the first oil storage tank 41 and the second oil storage tank 42 are respectively arranged on the L-shaped On both sides of the support plate 36, piston cylinders are provided in the first oil storage tank 41 and the second oil storage tank 42, piston rods 43 are installed in the two piston cylinders, and the installation directions of the piston rods 43 in the two piston cylinders are opposite, and lubricating oil is provided in the two piston cylinders. A slide groove 45 is provided on the side of the first oil storage tank 41 close to the L-shaped support plate 36, and oil outlets 44 are also installed on the first oil storage tank 41 and the second oil storage tank 42. The two oil outlets 44 are connected with oil pipelines 46, and the two oil pipelines 46 are respectively connected with adjacent connecting pipes 24. A second connecting rod 38 is installed on the side of the L-shaped support plate 36 close to the first oil storage tank 41, and the second connecting rod 38 is slidably arranged in the slide groove 45. The second connecting rod 38 is fixed to the piston rod 43 in the first oil storage tank 41 through the slide groove 45. A first connecting rod 37 is installed on the side of the L-shaped support plate 36 close to the second oil storage tank 42, and the first connecting rod 37 is fixed to the piston rod 43 in the second oil storage tank 42; When the upper mold body 31 drives the L-shaped support plate 36 to move upward, the L-shaped support plate 36 gradually contacts the abutment plate 53 upward, and pushes the abutment plate 53 during the continuous upward movement of the L-shaped support plate 36, so that the abutment plate 53 pushes the ejector body 51 to slide upward along the lubrication cavity 27, and the ejector body 51 drives the ejector plate 52 to move upward out of the limiting cavity 26, so that the ejector plate 52 pushes the product in the molding cavity 22 out; After the product is pushed out, the hydraulic rod 33 is activated to close the upper mold body 31 and the lower mold body 21 again, and at the same time, the ejector body 51, the ejector plate 52 and the abutment plate 53 rebound downward under the action of the pressure spring 54, so that the ejector plate 52 is clamped in the limiting cavity 26 again; At the same time, when the L-shaped support plate 36 moves upward, the second connecting rod 38 on the L-shaped support plate 36 slides upward along the slide groove 45 at the same time, so that the second connecting rod 38 drives the piston rod 43 in the first oil storage tank 41 to move upward, so that the piston rod 43 pushes the lubricating oil in the piston cylinder in the first oil storage tank 41 through the oil outlet 44 on the first oil storage tank 41, and injects it into the lower mold body 21 through the oil delivery pipe 46, and inputs it into the lubricating cavity 27 along the connecting hole 25 on one side, so as to lubricate the push rod body 51 in the lubricating cavity 27; At the same time, the first connecting rod 37 on the other side drives the piston rod 43 on the second oil storage tank 42 to slide upward under the action of the L-shaped support plate 36, and the lubricating oil in the connecting hole 25 and the lubricating cavity 27 is pumped out to avoid excessive accumulation of lubricating oil; At the same time, in order to prevent the lubricating oil from flowing into the molding cavity 22 through the lubricating cavity 27, a sealing oil retaining ring 55 is provided. This design ensures that the lubricating oil will only circulate in the lubricating system and will not contaminate the product in the molding cavity 22; When the L-shaped support plate 36 moves downward after completion, the first connecting rod 37 drives the piston rod 43 on the second oil storage tank 42 to move downward, and the previously extracted lubricating oil is re-injected into the lubrication system through the oil outlet 44. At the same time, the second connecting rod 38 drives the piston rod 43 in the first oil storage tank 41 to move downward, and the lubricating oil is pumped back into the first oil storage tank 41, so that the lubricating oil is circulated in the injection mold, and the ejector main body 51 is continuously lubricated, thereby improving the service life of the mold and the quality of the injection molded product.

[0023] The working principle of the present invention is as follows: when performing injection molding, firstly start the hydraulic rod 33, and use the hydraulic rod 33 to move the upper mold body 31 toward the lower mold body 21, so that the upper mold body 31 and the lower mold body 21 are merged, and the positioning block 35 on the upper mold body 31 is clamped in the positioning groove 23 on the lower mold body 21. After merging, the injection molding material is injected into the upper mold body 31 through the injection port 32, and flows into the molding cavity 22 in the lower mold body 21 through the upper mold body 31, so that the material is completely filled in the molding cavity 22, and waits for the injection molding material to be molded; After the raw material is formed, the hydraulic rod 33 is first started to drive the upper mold body 31 to move upward and disengage from the lower mold body 21, so that the upper mold body 31 is separated from the lower mold body 21. At the same time, when the upper mold body 31 moves upward, the L-shaped support plate 36 arranged on the upper mold body 31 moves upward at the same time. When the upper mold body 31 drives the L-shaped support plate 36 to move upward, the L-shaped support plate 36 gradually contacts the abutment plate 53 upward. In the process of the L-shaped support plate 36 continuously moving upward, the abutment plate 53 is pushed, so that the abutment plate 53 pushes the ejector body 51 to slide upward along the lubrication cavity 27. The ejector body 51 drives the ejector plate 52 to move upward from the limiting cavity 26, so that the ejector plate 52 pushes the product in the molding cavity 22 out. After the product is pushed out, the hydraulic rod 33 is activated to close the upper mold body 31 and the lower mold body 21 again, and at the same time, the ejector body 51, the ejector plate 52 and the abutment plate 53 rebound downward under the action of the pressure spring 54, so that the ejector plate 52 is clamped in the limiting cavity 26 again; At the same time, when the L-shaped support plate 36 moves upward, the second connecting rod 38 on the L-shaped support plate 36 slides upward along the slide groove 45 at the same time, so that the second connecting rod 38 drives the piston rod 43 in the first oil storage tank 41 to move upward, so that the piston rod 43 pushes out the lubricating oil in the piston cylinder in the first oil storage tank 41 through the oil outlet 44 on the first oil storage tank 41, and injects it into the lower mold body 21 through the oil delivery pipe 46, and inputs it into the lubricating cavity 27 along the connecting hole 25 on one side, so as to lubricate the push rod body 51 in the lubricating cavity 27. At the same time, the first connecting rod 37 on the other side drives the piston rod 43 on the second oil storage tank 42 to slide upward under the action of the L-shaped support plate 36, and draws out the lubricating oil in the connecting hole 25 and the lubricating cavity 27, so as to avoid excessive accumulation of lubricating oil. When moving downward after completion, the first connecting rod 37 drives the piston rod 43 on the second oil storage tank 42 to move downward, and re-injects the previously extracted lubricating oil into the lubrication system through the oil outlet 44. At the same time, the second connecting rod 38 drives the piston rod 43 in the first oil storage tank 41 to move downward, and draws the lubricating oil back into the first oil storage tank 41, so that the lubricating oil is circulated in the injection mold, and the push rod body 51 is continuously lubricated, thereby improving the service life of the mold and the quality of the injection molded product. The push rod assembly 5 is lubricated by the lubricating assembly 4, so that the movement of the push rod assembly 5 is more stable.

[0024] It should be noted that the various devices in this application are common devices in the market, and can be selected according to specific needs during specific use. The circuit connection relationship of each device belongs to a simple series and parallel connection circuit. There is no innovation in the circuit connection part. Those skilled in the art can implement it relatively easily. It belongs to the existing technology and will not be elaborated on.

[0025] The above are only preferred specific implementation modes of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solutions and inventive concepts of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A self-lubricating center ejector structure for an injection mold, comprising a bracket (1), characterized in that: The support (1) is provided with a plurality of legs (11), a lower mold assembly (2) is provided on the plurality of legs (11), an upper mold assembly (3) is provided directly above the lower mold assembly (2), and the top of the upper mold assembly (3) is fixed to the support (1), a push rod assembly (5) for ejecting a molded product is provided in the lower mold assembly (2), a lubrication assembly (4) for lubricating the push rod assembly (5) is provided on the support (1), and a liquid outlet end of the lubrication assembly (4) penetrates and extends into the lower mold assembly (2); The upper mold assembly (3) comprises an upper mold body (31), and an L-shaped support plate (36) for lifting the ejector rod assembly (5) upward is installed on one side of the upper mold body (31), the bottom of the L-shaped support plate (36) extends to the bottom of the lower mold assembly (2), and the L-shaped support plate (36) is connected to the lubrication assembly (4).

2. The self-lubricating center ejector rod structure of an injection mold according to claim 1, characterized in that: The lower mold assembly (2) comprises a lower mold body (21), a molding cavity (22) is provided at the top of the lower mold body (21), and a plurality of positioning grooves (23) for assisting the lower mold assembly (2) and the upper mold assembly (3) to close are also provided at the top of the lower mold body (21).

3. The self-lubricating center ejector rod structure of an injection mold according to claim 2, characterized in that: A limiting cavity (26) is provided inside the lower mold body (21), and the limiting cavity (26) is located at the center of the molding cavity (22); a lubricating cavity (27) is also provided inside the lower mold body (21), and the lubricating cavity (27) is communicated with the limiting cavity (26); Two connecting tubes (24) are also installed on the side wall of the lower mold body (21), and a connecting hole (25) connected to the two connecting tubes (24) is provided inside the lower mold body (21), and the connecting hole (25) is connected to the lubrication cavity (27).

4. The self-lubricating center ejector rod structure of an injection mold according to claim 1, characterized in that: The upper mold assembly (3) comprises an upper mold body (31), a hydraulic rod (33) is arranged above the upper mold body (31), the top of the hydraulic rod (33) is mounted on the bracket (1), the output end of the hydraulic rod (33) is fixed to the upper mold body (31), and two groups of auxiliary support rods (34) for assisting the movement of the upper mold body (31) are also installed on the top of the upper mold body (31).

5. The self-lubricating center ejector rod structure of an injection mold according to claim 4, characterized in that: The top of the upper mold body (31) is also provided with an injection port (32), the upper mold body (31) is provided with an injection hole connected to the injection port (32), and the bottom of the injection hole is connected to the molding cavity (22); A plurality of positioning blocks (35) are installed on one side of the upper mold body (31) close to the lower mold body (21), and the plurality of positioning blocks (35) correspond one-to-one to the plurality of positioning grooves (23) on the lower mold body (21).

6. The self-lubricating center ejector rod structure of an injection mold according to claim 1, characterized in that: The push rod assembly (5) comprises a push rod body (51), the push rod body (51) is slidably disposed in the lubrication cavity (27), a top plate (52) is mounted on the top of the push rod body (51), the top plate (52) is clamped in the limit cavity (26) on the lower mold body (21), and an abutment plate (53) is mounted on one end of the push rod body (51) away from the top plate (52), and the abutment plate (53) is located directly above the extended end of the L-shaped support plate (36); Two sealing oil retaining rings (55) are slidably sleeved on the outer surface of the push rod body (51) located in the lower mold body (21), and the two sealing oil retaining rings (55) are respectively fixedly connected to the inner walls at both ends of the lubrication cavity (27). A pressure spring (54) is also sleeved on the outer surface of the push rod body (51), one end of the pressure spring (54) is fixed to the abutment plate (53), and the other end is fixed to the bottom of the lower mold body (21).

7. The self-lubricating center ejector rod structure of an injection mold according to claim 1, characterized in that: The lubrication assembly (4) comprises a first oil storage tank (41) and a second oil storage tank (42), the first oil storage tank (41) and the second oil storage tank (42) are both mounted on the bracket (1), and the first oil storage tank (41) and the second oil storage tank (42) are respectively arranged on both sides of the L-shaped support plate (36), the first oil storage tank (41) and the second oil storage tank (42) are both provided with a piston cylinder, the two piston cylinders are both provided with a piston rod (43), and the installation directions of the piston rods (43) in the two piston cylinders are opposite, the two piston cylinders are both provided with lubricating oil, and a slide groove (45) is provided on a side of the first oil storage tank (41) close to the L-shaped support plate (36); The first oil storage tank (41) and the second oil storage tank (42) are both provided with oil outlets (44), the two oil outlets (44) are both connected to oil delivery pipes (46), and the two oil delivery pipes (46) are respectively connected to adjacent connecting pipes (24).

8. The self-lubricating center ejector rod structure of an injection mold according to claim 1, characterized in that: A second connecting rod (38) is installed on one side of the L-shaped support plate (36) close to the first oil storage tank (41); the second connecting rod (38) is slidably disposed in a slide groove (45); the second connecting rod (38) is fixed to a piston rod (43) in the first oil storage tank (41) via the slide groove (45); A first connecting rod (37) is installed on one side of the L-shaped support plate (36) close to the second oil storage tank (42), and the first connecting rod (37) is fixed to a piston rod (43) in the second oil storage tank (42).

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