Push rod injection mold

Abstract

The invention belongs to the field of injection molds, and particularly relates to a push rod injection mold which comprises an upper mold base and a lower mold base, the upper mold base is supported and installed on the lower mold base through multiple sets of hydraulic telescopic cylinders, and the lower mold base is supported and fixedly arranged on a base; a mold core cavity is formed in the lower mold base, and a mold core main body is supported and mounted on the mold core cavity through a mold core mounting structure; a plurality of cavities are formed in the mold core main body, and injection molding channels matched with the multiple cavities are formed in the mold core main body; a supporting cylinder is fixedly arranged on the side wall of the mold core body, a rectangular sliding cavity is formed in the supporting cylinder, a mounting block is slidably arranged on the rectangular sliding cavity in a penetrating mode, and the end, located in the rectangular sliding cavity, of the mounting block is connected with the supporting cylinder through a first supporting spring; the installation block is provided with an inclined face, and the inclined face on the installation block faces downwards. According to the mold core mounting structure, rapid mounting of the mold core main body can be achieved, different mold core main bodies can be replaced conveniently, and use is convenient.

Description

Technical Field

[0001] The invention belongs to the technical field of injection molds, and in particular relates to a push rod injection mold. Background Art

[0002] The injection mold injects molten plastic particles into the main channel of the mold through a nozzle. The molten plastic particles flow into each branch channel through the main channel, and finally flow into the molding cavity connected to the branch channel. The plastic parts are formed through injection molding processes such as pressure holding and cooling.

[0003] Syringes can also be used in medical equipment, containers, and scientific instruments such as some chromatography to inject through a rubber diaphragm. The syringe is mainly composed of a syringe barrel, a push rod, and a syringe piston mounted on the end of the push rod. Among them, the syringe push rod is made of plastic injection molding.

[0004] The syringe plunger forming molds currently in use generally have the following disadvantages: usually, the inner mold structure is fixed together with the mold frame, that is, one set of inner mold structure corresponds to one set of mold frame. When processing different products, it is usually necessary to replace the mold core together with the mold frame; however, the design and manufacturing cycle of the integral mold is long, the cost is high, the volume is large and bulky, and the replacement of the entire set is a waste of resources; currently, the replaceable mold core needs to be positioned and locked in multiple ways when installed in the mold frame, which makes the installation structure of the mold core complicated and slow, affecting production efficiency. Summary of the invention

[0005] The purpose of the embodiments of the present invention is to provide a push rod injection mold, aiming to solve the technical problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions.

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

[0008] A push rod injection mold, comprising an upper mold base and a lower mold base, wherein the upper mold base is supported and installed on the lower mold base through multiple groups of hydraulic telescopic cylinders, and the lower mold base support is fixedly arranged on a base;

[0009] The lower mold base is provided with a mold core cavity, and a mold core body is installed on the mold core cavity through the support of the mold core installation structure;

[0010] The mold core body is provided with a plurality of cavities, and the mold core body is provided with injection channels matching the plurality of cavities;

[0011] A support cylinder is fixedly arranged on the side wall of the mold core body, and a rectangular sliding cavity is provided inside the support cylinder. A mounting block is slidably arranged on the rectangular sliding cavity, wherein the end of the mounting block located in the rectangular sliding cavity is connected to the support cylinder through a first supporting spring. When the mounting block is retracted into the sliding cavity under force, the first supporting spring will be compressed. Correspondingly, when the mounting block is not subjected to force, the elastic support of the first supporting spring will push the end of the mounting block to extend out of the sliding cavity.

[0012] The mounting block is provided with an inclined surface, and the inclined surface on the mounting block is arranged downward.

[0013] Furthermore, an injection port is provided on the top of the upper mold base for injecting material into the push rod molding cavity.

[0014] Furthermore, a coolant pipeline is provided on the lower mold base, and the coolant pipeline is arranged in a serpentine shape inside the lower mold base, which is used to quickly cool down the mold core body and improve the injection molding efficiency of the push rod;

[0015] The pipe opening of the cooling liquid pipeline provided in the embodiment of the present invention is provided with a liquid injection nozzle, which is connected to the external cooling liquid pipeline system. The cooling liquid fully exchanges heat with the mold core body through the cooling liquid 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 core cavity, and a limiting groove is provided on the circular column. The top surface of the limiting groove is a planar structure, and the bottom surface of the limiting groove is an inclined surface structure, so that when the core body is inserted into the 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 supporting force of the first supporting spring causes the mounting block to be 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, making it impossible for the mounting block to move upward relative to the limiting groove, thereby completing the fixation of the core body.

[0017] Furthermore, the circular column is rotatably arranged inside the lower die base, and an adjusting cap is coaxially fixedly installed on the top end of the circular column. The adjusting cap is located in the accommodating cavity, and the accommodating cavity is opened on the upper surface of the lower die base, so that the adjusting cap is exposed to the outside, which is convenient for operating the adjusting cap;

[0018] A polygonal groove is provided on the adjusting cap.

[0019] Furthermore, the two sides of the circular column have straight-face notches. When the circular column rotates, the mounting block can be changed from being in the limiting groove to being in the straight-face notch. Since the straight-face notch is a planar structure, the circular column no longer limits the mounting block. At this time, the core body can be smoothly taken out of the core cavity.

[0020] The outer ring sleeve of the circular column is provided with a gear;

[0021] The mold core installation structure also includes a movable tooth plate, which is meshed with the gear. The movable tooth plate is connected to the fixed plate through an elastic member, and the fixed plate is fixedly installed inside the lower mold base.

[0022] Furthermore, the elastic member includes a supporting guide rod, which is fixedly connected to the movable toothed plate, and the movable toothed plate is slidably arranged on the fixed plate, one side of the fixed plate is connected to one end of the movable toothed plate by a third supporting spring, and the other end of the fixed plate is connected to the other end of the movable toothed plate by a fourth supporting spring. When a wrench tool that matches the polygonal groove is used to drive the circular column to rotate, the circular column rotates a certain angle, which will push the movable toothed plate to move. At this time, the third supporting spring and the fourth supporting spring of the elastic member are deformed, and the mounting block changes from a state of being against the limiting groove to a state of being against the straight face notch. Since the straight face notch is a planar structure, the circular column no longer plays a limiting role on the mounting block. At this time, the core body can be smoothly removed from the core cavity. It can be understood that, under the supporting action of the elastic member, the limiting groove is aligned with the mounting block, and at this time, it is convenient for the core body to be quickly installed in the core cavity.

[0023] Furthermore, elastic legs are provided at the four corners of the lower surface of the core body, and each elastic leg includes a telescopic sleeve rod, a bottom block is fixedly installed at the bottom end of the telescopic sleeve rod, and the bottom block is fixedly connected to the bottom surface support of the core cavity. When the core body is pressed into the core cavity, the telescopic sleeve rod will be shortened; wherein, a second support spring is provided 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 core body, and the bottom end of the second support spring is connected to the bottom block. When the core body is pressed into the core cavity, the second support spring is in a compressed state, so that when the core body is taken out from the core cavity, the core body can be automatically popped up from the core cavity by the elastic restoring force of the second support spring, so that the core body can be easily removed from the core cavity.

[0024] Compared with the prior art, the push rod injection mold of the present invention has the following beneficial effects:

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

[0026] Second, in the specific operation of the mold core installation structure of the present invention, when the circular column rotates, the installation block can be changed from being against the limiting groove to being against the straight-face notch. Since the straight-face notch is a planar structure, the circular column at this time no longer plays a limiting role on the installation block. At this time, the mold core body can be smoothly taken out of the mold core cavity, which is convenient for replacing the mold core body, easy to operate, and improves the injection molding efficiency of the push rod;

[0027] Thirdly, according to the present invention, when the core body is installed into the 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 supporting force of the first supporting spring causes the mounting block to be in the limiting groove; and 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, making it impossible for the mounting block to move upward relative to the limiting groove, thereby completing the fixation of the core body. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention.

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

[0030] Figure 2 A schematic structural diagram of a mold core body in a push rod injection mold provided by the present invention;

[0031] Figure 3 for Figure 2 A front view of the core body provided;

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

[0033] Figure 5 A schematic diagram of a mold core installation structure in a push rod injection mold provided by the present invention;

[0034] Figure 6 for Figure 5 A front view of the core mounting structure provided in FIG.

[0035] The reference numerals are as follows:

[0036] 1. Upper mold base; 2. Lower mold base; 21. Core cavity; 22. Accommodating cavity; 23. Coolant pipeline; 231. Liquid injection nozzle; 3. Base; 4. Injection port; 5. 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. Core mounting structure; 61. Fixed plate; 62. Movable tooth plate; 63. Support guide rod; 64. Third support spring; 65. Fourth support spring; 66. Gear; 67. Adjustment cap; 671. Polygonal groove; 68. Circular column; 681. Limiting groove; 682. Face notch; 7. Hydraulic telescopic cylinder. DETAILED DESCRIPTION

[0037] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0038] The specific implementation of the present invention is described in detail below in conjunction with 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 installed on the lower mold base 2 by multiple groups of hydraulic telescopic cylinders 7, and the lower mold base 2 is supported and fixed on a base 3; the present invention utilizes the telescopic function of the hydraulic telescopic cylinder 7 to move the upper mold base 1 upward relative to the lower mold base 2, thereby performing a mold opening action; conversely, the telescopic function of the hydraulic telescopic cylinder 7 is utilized to move the upper mold base 1 downward relative to the lower mold base 2 to achieve a mold closing action.

[0040] Among them, a core cavity 21 is opened on the lower mold base 2, and a core body 5 is supported and installed on the core cavity 21 through a core mounting structure 6; accordingly, the core body 5 of the present invention is a female mold core, wherein the present invention also includes a male mold core structure corresponding to the core body 5, and the male mold core structure and the core body 5 have the same structure, and the two 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 push rod molding cavity.

[0042] Among them, as a preferred embodiment, Figure 1 and Figure 2 As shown, the core mold body 5 provided in the embodiment of the present invention is provided with a plurality of cavities 51 , and the core mold body 5 is provided with injection channels 52 matched with the plurality of cavities 51 .

[0043] For further information, please refer to Figure 1 In an embodiment of the present invention, a coolant pipeline 23 is provided on the lower mold base 2, and the coolant pipeline 23 is serpentinely distributed inside the lower mold base 2, for quickly cooling the core body 5, thereby improving the injection molding efficiency of the push rod; optionally, the pipe mouth of the coolant pipeline 23 provided in the embodiment of the present invention is provided with a liquid injection nozzle 231, and the liquid injection nozzle 231 is connected to an external coolant pipeline system, and the coolant is fully heat-exchanged with the core body 5 through the coolant pipeline 23, thereby improving the heat dissipation and cooling efficiency of the core body 5.

[0044] For further information, please refer to Figure 1-Figure 6 In the embodiment of the present invention, a support tube 53 is fixedly provided on the side wall of the core body 5, and a rectangular sliding cavity is provided inside the support tube 53. A mounting block 55 is slidably provided on the rectangular sliding cavity, wherein the end of the mounting block 55 located in the rectangular sliding cavity is connected to the support tube 53 through a first supporting spring 54. When the mounting block 55 is retracted into the sliding cavity under force, the first supporting spring 54 is compressed. Correspondingly, when the mounting block 55 is not subjected to force, the elastic support of the first supporting spring 54 pushes the end of the mounting block 55 out of the sliding cavity;

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

[0046] In order to facilitate the rapid installation of the core body 5 in the core cavity 21, in an embodiment of the present invention, a circular column 68 is provided on the inner wall of the core cavity 21, and a limiting groove 681 is provided on the circular column 68. 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, so that when the core body 5 is loaded into the core cavity 21, the inclined surface of the mounting block 55 presses on the circular column 68, which will cause 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 supporting force of the first supporting spring 54 causes the mounting block 55 to be 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, so that the mounting block 55 cannot move up relative to the limiting groove 681, thereby completing the fixation of the core body 5.

[0047] Please continue reading Figure 1-Figure 6 In the embodiment of the present invention, the circular column 68 is rotatably arranged inside the lower die base 2, and an adjusting cap 67 is coaxially fixedly installed on the top of the circular column 68. The adjusting cap 67 is located in the accommodating cavity 22. The accommodating cavity 22 is opened on the upper surface of the lower die base 2, so that the adjusting cap 67 is exposed to the outside, which is convenient for operating the adjusting cap 67.

[0048] The adjusting cap 67 is provided with a polygonal groove 671 .

[0049] Furthermore, both side edges of the circular column 68 have straight-face notches 682. When the circular column 68 rotates, the mounting block 55 can be transformed from a state of resting in the limiting groove 681 to a state of resting against the straight-face notch 682. Since the straight-face notch 682 is a planar structure, the circular column 68 at this time no longer serves to limit the mounting block 55. At this time, the core body 5 can be smoothly taken out of the core cavity 21.

[0050] Please continue reading Figure 5 and Figure 6 In the embodiment of the present invention, the outer ring of the circular column 68 is provided with a gear 66. Accordingly, the mold core mounting structure 6 of the present invention further includes a movable tooth plate 62, which is meshed with the gear 66. The movable tooth plate 62 is connected to the fixed plate 61 through an elastic member, and the fixed plate 61 is fixedly installed inside the lower mold base 2.

[0051] Optionally, the elastic member includes a supporting guide rod 63, which is fixedly connected to the movable tooth plate 62, and the movable tooth plate 62 is slidably arranged on the fixed plate 61, one side of the fixed plate 61 is connected to one end of the movable tooth plate 62 via a third supporting spring 64, and the other end of the fixed plate 61 is connected to the other end of the movable tooth plate 62 via a fourth supporting spring 65. When a wrench tool or the like that matches the polygonal groove 671 is used to drive the circular column 68 to rotate, when the circular column 68 rotates a certain angle, it will push the movable tooth plate 62 to move. When the third support spring 64 and the fourth support spring 65 of the elastic member are deformed, the mounting block 55 changes from being against the limiting groove 681 to being against the facing notch 682. Since the facing notch 682 is a planar structure, the circular column 68 no longer limits the mounting block 55. At this time, the core body 5 can be smoothly taken out of the core cavity 21. It can be understood that, with the support of the elastic member, the limiting groove 681 is aligned with the mounting block 55. At this time, it is convenient for the core body 5 to be quickly installed in the core cavity 21.

[0052] Furthermore, in an embodiment of the present invention, elastic legs are provided at the four corners of the lower surface of the core body 5, and each elastic leg includes a telescopic sleeve 56, and a bottom block 57 is fixedly installed at the bottom end of the telescopic sleeve 56, and the bottom block 57 is fixedly connected to the bottom surface support of the core cavity 21. When the core body 5 is pressed into the core cavity 21, the telescopic sleeve 56 will be shortened; wherein, the outer ring of the telescopic sleeve 56 is provided with a second support spring 58, the top end of the second support spring 58 is connected to the bottom surface of the core body 5, and the bottom end of the second support spring 58 is connected to the bottom block 57. When the core body 5 is pressed into the core cavity 21, the second support spring 58 is in a compressed state, so that when the core body 5 is taken out of the core cavity 21, the core body 5 can be automatically popped up from the core cavity 21 by means of the elastic restoring force of the second support spring 58, so that the core body 5 can be easily removed from the core cavity 21.

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

[0054] The above solutions are only an illustration of a preferred example, but are not limited thereto. When implementing the present invention, appropriate replacement and / or modification can be performed according to user needs.

[0055] The number of devices and processing scales described here are used to simplify the description of the present invention. Applications, modifications and variations of the present invention will be obvious to those skilled in the art.

[0056] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the specification and the embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily realized. Therefore, without departing from the general concept defined by the claims and equivalent scope, the present invention is not limited to the specific details and the illustrations shown and described here.

Claims

1. A push rod injection mold, characterized in that: It comprises an upper die base (1) and a lower die base (2), wherein the upper die base (1) is supported and installed on the lower die base (2) by means of a plurality of sets of hydraulic telescopic cylinders (7), and the lower die base (2) is supported and fixedly arranged on a base (3); The lower mold base (2) is provided with a mold core cavity (21), and a mold core body (5) is supported and installed on the mold core cavity (21) via a mold core installation structure (6); The mold core body (5) is provided with a plurality of mold cavities (51), and the mold core body (5) is provided with injection channels (52) matching the plurality of mold cavities (51); A support tube (53) is fixedly arranged on the side wall of the core body (5), the support tube (53) has a rectangular sliding cavity inside, and a mounting block (55) is slidably arranged through the rectangular sliding cavity, wherein the end of the mounting block (55) located in the rectangular sliding cavity is connected to the support tube (53) via a first support spring (54); The mounting block (55) has an inclined surface, and the inclined surface on the mounting block (55) is oriented downward.

2. The push rod 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 push rod injection mold according to claim 2, characterized in that: The lower die base (2) is provided with a cooling liquid pipeline (23), which is arranged in a serpentine distribution inside the lower die base (2); and a liquid injection nozzle (231) is provided at the pipe mouth of the cooling liquid pipeline (23).

4. The push rod injection mold according to claim 2 or 3, characterized in that: A circular column (68) is arranged on the inner wall of the core cavity (21), and a limiting groove (681) is provided on the circular column (68). The top surface of the limiting groove (681) is a plane structure, and the bottom surface of the limiting groove (681) is an inclined surface structure.

5. The push rod injection mold according to claim 4, characterized in that: The circular column (68) is rotatably arranged inside the lower die 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 accommodating cavity (22); The accommodating cavity (22) is opened on the upper surface of the lower mold base (2); The adjusting cap (67) is provided with a polygonal groove (671).

6. The push rod injection mold according to claim 5, characterized in that: The two side edges of the circular column (68) are provided with straight-face notches (682), and the straight-face notches (682) are planar structures; The outer ring of the circular column (68) is provided with a gear (66); The mold core mounting structure (6) also includes a movable tooth plate (62), the movable tooth plate (62) is meshed with the gear (66), the movable tooth plate (62) is connected to the fixed plate (61) through an elastic member, and the fixed plate (61) is fixedly mounted inside the lower mold base (2).

7. The push rod injection mold according to claim 6, characterized in that: The elastic member comprises a supporting guide rod (63), the supporting guide rod (63) is fixedly connected to the movable tooth plate (62), and the movable tooth plate (62) is slidably arranged on the fixed plate (61), one side of the fixed plate (61) and one end of the movable tooth plate (62) are connected via a third supporting spring (64), and the other end of the fixed plate (61) and the other end of the movable tooth plate (62) are connected via a fourth supporting spring (65).

8. The push rod injection mold according to claim 7, characterized in that: The four corners of the lower surface of the mold core body (5) are provided with elastic legs, and each elastic leg comprises a telescopic sleeve rod (56); A bottom block (57) is fixedly mounted on the bottom end of the telescopic sleeve rod (56), and the bottom block (57) is fixedly connected to the bottom surface support of the mold core cavity (21); The outer ring of the telescopic sleeve rod (56) is provided with a second support spring (58), 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).

Images