A type of push rod injection mold

Abstract

This invention belongs to the field of injection molds, specifically a push rod injection mold, including an upper mold base and a lower mold base. The upper mold base is supported and mounted on the lower mold base by multiple sets of hydraulic telescopic cylinders, and the lower mold base is fixedly mounted on a base. A mold core cavity is formed on the lower mold base, and a mold core body is supported and mounted on the mold core cavity by a mold core mounting structure. The mold core body has multiple cavities, and injection channels that mate with these cavities are also formed. A support cylinder is fixedly mounted on the side wall of the mold core body. The support cylinder has a rectangular sliding cavity inside, and a mounting block is slidably mounted through the rectangular sliding cavity. The end of the mounting block located within the rectangular sliding cavity is connected to the support cylinder by a first support spring. The mounting block has an inclined surface, and the inclined surface faces downwards. The mold core mounting structure of this invention enables rapid installation of the mold core body, facilitates the replacement of different mold core bodies, and is convenient to use.

Description

Technical Field

[0001] This invention belongs to the field of injection mold technology, and particularly relates to an ejector pin injection mold. Background Technology

[0002] Injection molds inject molten plastic particles into the main runner of the mold through nozzles. The molten plastic particles flow through the main runner into various branch runners and finally into the molding cavity connected to the branch runners. After injection molding processes such as pressure holding and cooling, the plastic parts are formed.

[0003] Syringes can also be used in medical devices, containers, and, for example, in some chromatographic scientific instruments, to inject through a rubber diaphragm. A syringe mainly consists of a barrel, a plunger, and a syringe piston mounted at the end of the plunger. The plunger is made of injection-molded plastic.

[0004] Currently used syringe plunger molding dies generally have the following drawbacks: Typically, the inner mold structure is fixed to the mold frame, meaning one set of inner mold structures corresponds to one set of mold frames. When processing different products, the mold core and mold frame usually need to be replaced together. However, the design and manufacturing cycle of integral molds is long, the cost is high, and they are large and bulky; replacing the entire set is a waste of resources. Currently, the installation of replaceable mold cores within the mold frame requires multi-directional positioning and locking, resulting in a complex and slow installation structure for the mold cores, thus affecting production efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a push rod injection mold, which aims to solve the technical problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution.

[0007] In a preferred embodiment of the present invention, a push rod injection mold is provided, comprising:

[0008] A push rod injection mold includes an upper mold base and a lower mold base. The upper mold base is supported and mounted on the lower mold base by multiple sets of hydraulic telescopic cylinders. The lower mold base is supported and fixedly mounted on a base.

[0009] The lower mold base is provided with a mold core cavity, and the mold core body is supported and installed on the mold core cavity by a mold core mounting structure.

[0010] The mold core body has multiple cavities, and the mold core body has injection channels that cooperate with the multiple cavities;

[0011] A support cylinder is fixedly installed on the side wall of the mold core body. The support cylinder has a rectangular sliding cavity inside. An installation block is slidably installed through the rectangular sliding cavity. The end of the installation block located in the rectangular sliding cavity is connected to the support cylinder by a first support spring. When the installation block is forcefully retracted into the sliding cavity, the first support spring will be compressed. Correspondingly, when the installation block is not forcefully installed, the end of the installation block will be pushed out of the sliding cavity under the elastic support of the first support spring.

[0012] The mounting block has an inclined surface, and the inclined surface of the mounting block is oriented downwards.

[0013] Furthermore, the top of the upper mold base is also provided with an injection port for injecting material into the ejector molding cavity.

[0014] Furthermore, the lower mold base is provided with coolant pipes, which are arranged in a serpentine pattern inside the lower mold base to quickly cool the mold core body and improve the injection molding efficiency of the ejector pin.

[0015] The coolant pipeline provided in this embodiment of the invention is equipped with a liquid injection nozzle at its inlet. The liquid injection nozzle is connected to an external coolant pipeline system. The coolant exchanges heat fully with the mold core body through the coolant pipeline, thereby improving the heat dissipation and cooling efficiency of the mold core body.

[0016] Furthermore, a circular column is provided on the inner wall of the mold core cavity, and the circular column has a limiting groove. The top surface of the limiting groove is a planar structure, and the bottom surface of the limiting groove is an inclined surface structure. When the mold core body is installed into the mold core cavity, the inclined surface of the mounting block presses on the circular column, causing the mounting block to retract into the sliding cavity. When the mounting block is aligned and inserted into the limiting groove, the elastic support force of the first support spring keeps the mounting block in the limiting groove. Since the upper surface of the mounting block is a planar structure, the upper surface of the mounting block abuts against the top surface of the limiting groove, preventing the mounting block from moving upward relative to the limiting groove, thereby completing the fixation of the mold core body.

[0017] Furthermore, the circular column is rotatably disposed inside the lower mold base, and an adjusting cap is coaxially fixedly installed on the top of the circular column. The adjusting cap is located in the receiving cavity, which is opened on the upper surface of the lower mold base, so that the adjusting cap is exposed and easy to operate.

[0018] The adjusting cap has a polygonal groove.

[0019] Furthermore, the two sides of the circular column have straight notches. When the circular column rotates, the mounting block can change from being pressed against the limiting groove to being pressed against the straight notch. Since the straight notch is a planar structure, the circular column no longer limits the mounting block. At this time, the mold core body can be smoothly removed from the mold core cavity.

[0020] The outer ring of the cylindrical column is fitted with a gear;

[0021] The mold core mounting structure also includes a movable toothed plate, which meshes with a gear. The movable toothed plate is connected to a fixed plate through an elastic element, and the fixed plate is fixedly installed inside the lower mold base.

[0022] Furthermore, the elastic element includes a support guide rod, which is fixedly connected to the movable toothed plate. The movable toothed plate is slidably mounted on the fixed plate. One side of the fixed plate is connected to one end of the movable toothed plate by a third support spring, and the other end of the fixed plate is connected to the other end of the movable toothed plate by a fourth support spring. When a wrench or similar tool that mates with the polygonal groove is used to rotate the circular column, the circular column rotates at a certain angle, which pushes the movable toothed plate to move. At this time, the third and fourth support springs of the elastic element deform, and the mounting block changes from being pressed against the limiting groove to being pressed against the straight notch. Since the straight notch is a planar structure, the circular column no longer limits the mounting block. At this time, the mold core body can be easily removed from the mold core cavity. It can be understood that the limiting groove is aligned with the mounting block by the support of the elastic element, which facilitates the quick installation of the mold core body into the mold core cavity.

[0023] Furthermore, each of the four corners of the lower surface of the mold core body is provided with elastic support legs, and each elastic support leg includes a telescopic sleeve rod. A base block is fixedly installed at the bottom end of the telescopic sleeve rod, and the base block is fixedly connected to the bottom surface of the mold core cavity. When the mold core body is pressed into the mold core cavity, the telescopic sleeve rod will shorten. A second support spring is sleeved on the outer ring of the telescopic sleeve rod. The top end of the second support spring is connected to the bottom surface of the mold core body, and the bottom end of the second support spring is connected to the base block. When the mold core body is pressed into the mold core cavity, the second support spring is in a compressed state. This allows the mold core body to be automatically bounced out of the mold core cavity by the elastic restoring force of the second support spring when it is removed from the mold core cavity, making it convenient to remove the mold core body from the mold core cavity.

[0024] Compared with the prior art, the beneficial effects of the ejector injection mold of the present invention are:

[0025] First, the present invention utilizes the telescopic function of a hydraulic telescopic cylinder to move the upper mold base upward relative to the lower mold base, thereby performing the mold opening action; conversely, it utilizes the telescopic function of a hydraulic telescopic cylinder to move the upper mold base downward relative to the lower mold base, thereby performing the mold closing action.

[0026] Secondly, in specific operation, when the circular column rotates, the mounting block can change from being pressed against the limiting groove to being pressed against the straight notch. Since the straight notch is a planar structure, the circular column no longer limits the mounting block. At this time, the main body of the mold core can be smoothly removed from the mold core cavity, making it convenient to replace the main body of the mold core. The operation is convenient and improves the injection molding efficiency of the push rod.

[0027] Third, the present invention ensures that when the mold core body is installed into the mold core cavity, the inclined surface of the mounting block presses against the cylindrical column, causing the mounting block to retract into the sliding cavity. When the mounting block is aligned and inserted into the limiting groove, the elastic support force of the first support spring keeps the mounting block in the limiting groove. Since the upper surface of the mounting block is a planar structure, the upper surface of the mounting block abuts against the top surface of the limiting groove, preventing the mounting block from moving upward relative to the limiting groove, thereby completing the fixing of the mold core body. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention.

[0029] Figure 1 This is a three-dimensional structural diagram of a push rod injection mold according to the present invention;

[0030] Figure 2 This is a schematic diagram of the core body in the ejector injection mold provided by the present invention;

[0031] Figure 3 for Figure 2 The main view of the mold core body is provided;

[0032] Figure 4 for Figure 2 A top view of the provided mold core body;

[0033] Figure 5 This is a schematic diagram of the mold core mounting structure in the ejector injection mold provided by the present invention;

[0034] Figure 6 for Figure 5 The front view of the mold core mounting structure provided in the image.

[0035] The attached figures are labeled as follows:

[0036] 1. Upper mold base; 2. Lower mold base; 21. Mold core cavity; 22. Receiving cavity; 23. Coolant pipeline; 231. Injection nozzle; 3. Base; 4. Injection port; 5. Mold core body; 51. Cavity; 52. Injection channel; 53. Support cylinder; 54. First support spring; 55. Mounting block; 56. Telescopic sleeve; 57. Bottom block; 58. Second support spring; 6. Mold core mounting structure; 61. Fixing plate; 62. Movable toothed plate; 63. Support guide rod; 64. Third support spring; 65. Fourth support spring; 66. Gear; 67. Adjusting cap; 671. Polygonal groove; 68. Circular column; 681. Limiting groove; 682. Straight notch; 7. Hydraulic telescopic cylinder. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0038] The specific implementation of the present invention will be described in detail below with reference to specific embodiments.

[0039] like Figure 1 As shown, in one embodiment of the present invention, a push rod injection mold is provided, including an upper mold base 1 and a lower mold base 2. The upper mold base 1 is supported and mounted on the lower mold base 2 by multiple sets of hydraulic telescopic cylinders 7, and the lower mold base 2 is fixedly mounted on a base 3. The present invention utilizes the telescopic function of the hydraulic telescopic cylinders 7 to move the upper mold base 1 upward relative to the lower mold base 2, thereby performing the mold opening action; conversely, it utilizes the telescopic function of the hydraulic telescopic cylinders 7 to move the upper mold base 1 downward relative to the lower mold base 2, thereby achieving the mold closing action.

[0040] The lower mold base 2 has a mold core cavity 21, and the mold core body 5 is supported and installed on the mold core cavity 21 by the mold core mounting structure 6. Accordingly, the mold core body 5 of the present invention is a female mold core. The present invention also includes a male mold core structure corresponding to the mold core body 5. The male mold core structure and the mold core body 5 have the same structure and cooperate with each other so that when the mold is closed, a push rod forming cavity for push rod forming processing is formed.

[0041] The top of the upper mold base 1 is also provided with an injection port 4 for injecting material into the ejector molding cavity.

[0042] Among them, as a preferred option, such as Figure 1 and Figure 2 As shown, the mold core body 5 provided in this embodiment of the invention has multiple cavities 51, and the mold core body 5 has injection channels 52 that cooperate with the multiple cavities 51.

[0043] For further information, please refer to [link / reference]. Figure 1 In this embodiment of the invention, a coolant pipeline 23 is provided on the lower mold base 2. The coolant pipeline 23 is arranged in a serpentine pattern inside the lower mold base 2 for rapid cooling of the mold core body 5, thereby improving the injection molding efficiency of the ejector pin. Optionally, the coolant pipeline 23 provided in this embodiment of the invention is provided with an injection nozzle 231 at its inlet. The injection nozzle 231 is connected to an external coolant pipeline system. The coolant exchanges heat fully with the mold core body 5 through the coolant pipeline 23, thereby improving the heat dissipation and cooling efficiency of the mold core body 5.

[0044] For further details, please refer to [link / reference]. Figures 1-6 In this embodiment of the invention, a support cylinder 53 is fixedly provided on the side wall of the mold core body 5. The support cylinder 53 has a rectangular sliding cavity inside. An installation block 55 is slidably provided through the rectangular sliding cavity. The end of the installation block 55 located in the rectangular sliding cavity is connected to the support cylinder 53 by a first support spring 54. When the installation block 55 is forcefully retracted into the sliding cavity, the first support spring 54 will be compressed. Correspondingly, when the installation block 55 is not forcefully applied, under the elastic support of the first support spring 54, the end of the installation block 55 will be pushed out of the sliding cavity.

[0045] Preferably, the mounting block 55 provided in this embodiment of the invention has an inclined surface, and the inclined surface of the mounting block 55 is oriented downwards.

[0046] To facilitate the quick installation of the mold core body 5 into the mold core cavity 21, in this embodiment of the invention, a circular column 68 is provided on the inner wall of the mold core cavity 21. The circular column 68 has a limiting groove 681. The top surface of the limiting groove 681 is a planar structure, and the bottom surface of the limiting groove 681 is an inclined surface structure. When the mold core body 5 is installed into the mold core cavity 21, the inclined surface of the mounting block 55 presses against the circular column 68, causing the mounting block 55 to retract into the sliding cavity. When the mounting block 55 is aligned and inserted into the limiting groove 681, the elastic support force of the first support spring 54 keeps the mounting block 55 in the limiting groove 681. Since the upper surface of the mounting block 55 is a planar structure, the upper surface of the mounting block 55 abuts against the top surface of the limiting groove 681, preventing the mounting block 55 from moving upward relative to the limiting groove 681, thereby completing the fixation of the mold core body 5.

[0047] Please continue reading. Figures 1-6 In this embodiment of the invention, the circular column 68 is rotatably disposed inside the lower mold base 2, and an adjusting cap 67 is coaxially fixedly installed on the top end of the circular column 68. The adjusting cap 67 is located in the receiving cavity 22, which is opened on the upper surface of the lower mold base 2, so that the adjusting cap 67 is exposed, making it convenient to operate the adjusting cap 67.

[0048] The adjusting cap 67 has a polygonal groove 671.

[0049] Furthermore, the circular column 68 has straight notches 682 on both sides. When the circular column 68 rotates, the mounting block 55 can change from being pressed against the limiting groove 681 to being pressed against the straight notch 682. Since the straight notch 682 is a planar structure, the circular column 68 no longer limits the mounting block 55. At this time, the mold core body 5 can be smoothly removed from the mold core cavity 21.

[0050] Please continue reading. Figure 5 and Figure 6 In this embodiment of the invention, the outer ring of the circular column 68 is fitted with a gear 66. Correspondingly, the mold core mounting structure 6 of the present invention also includes a movable toothed plate 62, which meshes with the gear 66. The movable toothed plate 62 is connected to the fixed plate 61 through an elastic element. The fixed plate 61 is fixedly installed inside the lower mold base 2.

[0051] Optionally, the elastic element includes a support guide rod 63, which is fixedly connected to the movable toothed plate 62. The movable toothed plate 62 is slidably mounted on the fixed plate 61. One side of the fixed plate 61 is connected to one end of the movable toothed plate 62 by a third support spring 64, and the other end of the fixed plate 61 is connected to the other end of the movable toothed plate 62 by a fourth support spring 65. When a wrench or similar tool that cooperates with the polygonal groove 671 is used to rotate the circular column 68, the rotation of the circular column 68 at a certain angle will push the movable toothed plate 62 to move. At this time, the third support spring 64 and the fourth support spring 65 of the elastic element deform, and the mounting block 55 changes from the state of abutting against the limiting groove 681 to abutting against the straight notch 682. Since the straight notch 682 is a planar structure, the circular column 68 no longer limits the mounting block 55. At this time, the mold core body 5 can be smoothly removed from the mold core cavity 21. It can be understood that under the support of the elastic element, the limiting groove 681 is aligned with the mounting block 55, which facilitates the quick installation of the mold core body 5 into the mold core cavity 21.

[0052] Furthermore, in this embodiment of the invention, elastic support legs are provided at the four corners of the lower surface of the mold core body 5. Each elastic support leg includes a telescopic sleeve 56. A bottom block 57 is fixedly installed at the bottom end of the telescopic sleeve 56. The bottom block 57 is fixedly connected to the bottom surface of the mold core cavity 21. When the mold core body 5 is pressed into the mold core cavity 21, the telescopic sleeve 56 will shorten. A second support spring 58 is sleeved on the outer ring of the telescopic sleeve 56. The top end of the second support spring 58 is connected to the bottom surface of the mold core body 5, and the bottom end of the second support spring 58 is connected to the bottom block 57. When the mold core body 5 is pressed into the mold core cavity 21, the second support spring 58 is in a compressed state. This allows the mold core body 5 to be automatically lifted out of the mold core cavity 21 by the elastic restoring force of the second support spring 58 when it is taken out of the mold core cavity 21, making it convenient to remove the mold core body 5 from the mold core cavity 21.

[0053] In addition, the male mold core structure installed on the upper mold base 1 of the present invention is also installed in the manner of mold core installation structure 6; the specifics will not be elaborated.

[0054] The above solutions are merely illustrative examples of preferred embodiments and are not intended to limit the scope of the invention. Appropriate substitutions and / or modifications can be made according to user needs when implementing this invention.

[0055] The number of devices and processing scale described herein are for the purpose of simplifying the description of the invention. Applications, modifications, and variations of the invention will be readily apparent to those skilled in the art.

[0056] Although embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and embodiments. It can be applied to various fields suitable for the present invention. Other modifications can be readily made by those skilled in the art. Therefore, without departing from the general concept defined by the claims and their equivalents, the present invention is not limited to the specific details and examples shown and described herein.

Claims

1. A push rod injection mold, characterized in that, It includes an upper mold base (1) and a lower mold base (2). The upper mold base (1) is supported and installed on the lower mold base (2) by multiple sets of hydraulic telescopic cylinders (7). The lower mold base (2) is fixedly supported on the base (3). The lower mold base (2) is provided with a mold core cavity (21), and the mold core body (5) is supported and installed on the mold core cavity (21) by the mold core mounting structure (6); The mold core body (5) has multiple cavities (51) and injection channels (52) that cooperate with the multiple cavities (51); A support cylinder (53) is fixedly installed on the side wall of the core body (5). The support cylinder (53) has a rectangular sliding cavity inside. An installation block (55) is slidably installed through the rectangular sliding cavity. The end of the installation block (55) located in the rectangular sliding cavity is connected to the support cylinder (53) by a first support spring (54). The mounting block (55) has an inclined surface, and the inclined surface of the mounting block (55) is oriented downwards; A circular column (68) is provided on the inner wall of the mold core cavity (21). The circular column (68) has a limiting groove (681). The top surface of the limiting groove (681) is a planar structure, and the bottom surface of the limiting groove (681) is an inclined surface structure. The circular column (68) has straight notches (682) on both sides, and the straight notches (682) are planar structures; The outer ring of the circular cylinder (68) is fitted with a gear (66); The mold core mounting structure (6) also includes a movable toothed plate (62), which meshes with a gear (66). The movable toothed plate (62) is connected to a fixed plate (61) through an elastic element, and the fixed plate (61) is fixedly installed inside the lower mold base (2).

2. The ejector injection mold according to claim 1, characterized in that, The top of the upper mold base (1) is also provided with an injection port (4).

3. The ejector injection mold according to claim 2, characterized in that, The lower mold base (2) is provided with a coolant pipeline (23), which is arranged in a serpentine pattern inside the lower mold base (2); the coolant pipeline (23) is provided with a liquid injection nozzle (231) at the pipe opening.

4. The ejector injection mold according to claim 3, characterized in that, The circular column (68) is rotatably disposed inside the lower mold base (2), and an adjusting cap (67) is coaxially fixedly installed on the top end of the circular column (68), and the adjusting cap (67) is located in the receiving cavity (22); The receiving cavity (22) is opened on the upper surface of the lower mold base (2); The adjusting cap (67) has a polygonal groove (671).

5. The ejector injection mold according to claim 4, characterized in that, The elastic element includes a support guide rod (63), which is fixedly connected to the movable toothed plate (62). The movable toothed plate (62) is slidably disposed on the fixed plate (61). One side of the fixed plate (61) is connected to one end of the movable toothed plate (62) by a third support spring (64), and the other end of the fixed plate (61) is connected to the other end of the movable toothed plate (62) by a fourth support spring (65).

6. The ejector injection mold according to claim 5, characterized in that, The lower surface of the core body (5) is provided with elastic support legs at the four corners, and each elastic support leg includes a telescopic sleeve (56). The bottom end of the telescopic sleeve (56) is fixedly installed with a bottom block (57), and the bottom block (57) is fixedly connected to the bottom surface of the mold core cavity (21); The telescopic sleeve (56) is fitted with a second support spring (58) on its outer ring. The top of the second support spring (58) is connected to the bottom surface of the mold core body (5), and the bottom of the second support spring (58) is connected to the bottom block (57).

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