CN209755942U

CN209755942U - Forming assembly of needle holder injection mold

Info

Publication number: CN209755942U
Application number: CN201920552972.XU
Authority: CN
Inventors: 魏治中
Original assignee: Chengdu Fengyixin Plastic Mould Technology Co Ltd
Current assignee: Chengdu Fengyixin Plastic Mould Technology Co Ltd
Priority date: 2019-04-22
Filing date: 2019-04-22
Publication date: 2019-12-10
Anticipated expiration: 2029-04-22

Abstract

The utility model provides a molding assembly of a needle holder injection mold, which relates to the technical field of injection molds, and comprises a first front mold core and a second front mold core which are overlapped and arranged in a front mold cavity and a rear mold push plate which is arranged in a rear mold cavity, wherein the second front mold core is provided with a plurality of rows, each row of front mold core comprises a plurality of main mold cavity holes which are penetrated through, so as to improve the processing efficiency of the injection mold and the stability of the molding quality of products; the molding assembly further comprises a mold core inserted in the large-diameter end mold insert hole and the main mold cavity hole and a mold insert inserted in the small-diameter end mold insert hole in a sliding mode, one end of the mold insert is inserted into the mold core, and molding quality of the needle holder is improved through improvement of a glue injection and demolding structure.

Description

Forming assembly of needle holder injection mold

Technical Field

The utility model relates to an injection mold technical field especially relates to a needle holder injection mold's shaping subassembly.

Background

In order to prevent cross infection, a needle holder for fixing a blood taking needle is a disposable product, is a material-consuming product, and is usually produced in batches by using an injection mold in order to reduce the processing cost, whether the structural design of the injection mold is reasonable plays a crucial role in the forming quality of the needle holder structure, and the forming precision directly determines the material amount of the needle holder, so that the processing cost of the needle holder is directly influenced.

in the injection mold for processing the needle holder in the prior art, the structural design of the molding part is unreasonable, the molded product has poor molding quality, black spots are easily generated on the surface, the surface of the product is easily scratched in the demolding process, and the molding quality of the product is reduced.

SUMMERY OF THE UTILITY MODEL

to the above-mentioned problem among the prior art, the utility model provides a needle holder injection mold's shaping subassembly has solved the fashioned product surface quality of the injection mold of needle holder among the prior art poor and the low problem of machining efficiency.

In order to achieve the purpose of the invention, the technical scheme adopted by the utility model is as follows:

Providing a molding assembly of a needle holder injection mold, which comprises a first front mold core and a second front mold core which are overlapped and arranged in a front mold cavity, and a rear mold push plate arranged in a rear mold cavity, wherein the second front mold core is positioned between the first front mold core and the rear mold push plate;

The second front mold core is provided with a plurality of rows, each row comprises a plurality of main cavity holes which penetrate through the second front mold core, the first front mold core is provided with small-diameter end insert holes corresponding to the main cavity holes, the rear mold push plate is provided with large-diameter end insert holes corresponding to the main cavity holes, the large-diameter end insert holes are conical holes, the small-diameter ends of the conical holes are adjacent to the main cavity holes and are larger than the maximum inner diameter of the main cavity holes, and one side of each small-diameter end insert hole is provided with a point pouring channel which is communicated with the main cavity hole;

the first front mold core and the second front mold core are both provided with water conveying channels; the molding assembly further comprises a core inserted in the large-diameter end insert hole and the main cavity hole and an insert inserted in the small-diameter end insert hole in a sliding mode, and one end of the insert is inserted into the core.

Furthermore, a first step hole is formed in one end, close to the main cavity hole, of the large-diameter end insert hole, a second step hole is formed in one end, close to the large-diameter end insert hole, of the main cavity hole, and the first step hole and the second step hole are concentric and have the same outer diameter. The first step hole and the second step hole form a cavity for forming the disc at the end part of the needle holder, and the formed product has a part of structure positioned in the rear die push plate, so that the product can move along with the rear die push plate, and then the demoulding of the product is completed.

furthermore, the taper of the side face of the insert hole at the large-diameter end is 3-10 degrees, so that the product is prevented from moving and scratching in the demolding process, and meanwhile, the guide effect is achieved, the positioning of the core and the main cavity hole is more accurate, and the wall surface of the molded product is more uniform.

Furthermore, the width of the gap between the large-diameter end insert hole and the mold core molding surface is 0.2-0.5 mm, and the gap in the width range ensures that the hole wall of the large-diameter end insert hole cannot abrade the molding surface in the process of installing and disassembling the mold core, so that the finish degree of the mold core molding surface is ensured, the molding quality of the inner wall of the needle holder is further ensured, and the mold core can be guided.

Furthermore, a plurality of water conveying inlets communicated with the water conveying channels are formed in the second front mold core, and the number of the water conveying inlets is not less than the number of rows of the main cavity holes, so that the cooling efficiency and the cooling effect of the water conveying are improved.

Furthermore, the cross section of the point pouring channel is gradually reduced along the glue feeding direction, after injection molding, the strength of a pouring gate formed by a product material which is left in the point pouring channel and is subjected to dry condensation is very low at the joint with the product body, and the pouring gate can be automatically broken after demolding, does not need to be corrected, reduces the processing procedures and improves the processing efficiency.

Furthermore, an arc-shaped convex part is arranged at the outlet of the point pouring gate, and the arc-shaped convex part enables a concave pit to be formed on the surface of a product during product forming so as to accommodate a residual mark left after the pouring gate is broken and avoid the residual mark from influencing the finish degree of the surface of the product.

Furthermore, two end faces of the second front mold core are provided with positioning grooves, and the end faces of the first front mold core and the rear mold push plate, which are adjacent to the second front mold core, are provided with positioning bosses corresponding to the positioning grooves. Through the matching of the positioning boss and the positioning groove, the relative positions of the second front mold core, the first front mold core and the rear mold push plate are unique, so that the alignment of the large-diameter end insert hole and the small-diameter end insert hole with the main cavity hole is ensured.

The utility model has the advantages that: the molding assembly distributes the cavities of the molded product on the first front mold core and the second front mold core, and the first front mold core and the second front mold core are two separated parts and can be separately processed, so that the processing difficulty of the main cavity is reduced, the processing precision of the main cavity is improved, and the quality of the molded product is improved;

The rear mold push plate is used for the demolding process after the product is molded, compared with the traditional ejector pin demolding, the pushing force is more uniform, the demolding process is more stable, the needle holder in the deep cylindrical and thin-wall shape is not easy to deform in the demolding process, the molding quality is better, and the rejection rate is lower; the large-diameter end insert hole for the mold core to penetrate through on the rear mold push plate is a conical hole, and the matching precision of the mold core and the main cavity hole is higher under the guiding action of the conical hole, so that the quality of a molded product is improved; because one end of the insert is inserted into the core and the insert is slidably inserted into the small-diameter-end insert hole, in the demolding process, the axial force for demolding can be given to the core by pushing the small-diameter-end insert hole, so that demolding is smoother.

Because be provided with multirow and every row contains a plurality of main type cavitys, this shaping subassembly can many products of shaping in the course of once moulding plastics processing, can improve product quality's stability, improves the production efficiency of product.

Drawings

Fig. 1 is a schematic perspective view of a molding assembly of a needle holder injection mold.

FIG. 2 is a cross-sectional view of a molding assembly of the needle holder injection mold.

FIG. 3 is a top view of the first front mold core of FIG. 1.

FIG. 4 is a top view of the second front mold core of FIG. 1.

Wherein, 1, a first front mold core; 11. a small diameter end insert bore; 12. a pouring channel is dotted; 13. positioning the boss; 2. a second front mold core; 21. a primary cavity bore; 22. a water carrying channel; 23. a second stepped bore; 24. a water transport inlet; 25. a positioning groove; 3. a rear mold push plate; 31. a large diameter end insert bore; 32. a first stepped bore; 4. a core; 5. and (4) embedding the mold insert.

Detailed Description

The following description of the embodiments of the present invention is provided to facilitate the understanding of the present invention by those skilled in the art, but it should be understood that the present invention is not limited to the scope of the embodiments, and various changes will be apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all inventions contemplated by the present invention are protected.

As shown in fig. 1 and 2, the molding assembly of the needle holder injection mold comprises a first front mold insert 1 and a second front mold insert 2 overlapped in a front mold cavity and a rear mold push plate 3 arranged in a rear mold cavity, the second front mold insert 2 is located between the first front mold insert 1 and the rear mold push plate 3, and the first front mold insert 1 and the second front mold insert 2 are fixed into a whole through a threaded fastener; the back mould push plate 3 is fixed on the back mould, and the end surface is contacted with the second front mould core 2.

The second front mold core 2 is provided with a plurality of rows, each row includes a plurality of main cavity holes 21, and fig. 4 shows a schematic structural view that each row of 4 rows includes 4 main cavity holes 21. The space between the cavity wall of the main cavity hole 21 and the molding surface of the inserted core 4 is the cavity for molding the needle holder. The upper and lower both sides of every row of main die cavity hole 21 all are provided with fortune water passageway 22, and are provided with the fortune water import 24 that is no less than main die cavity hole 21 row number on the side of second front mould benevolence 2 to reduce the circulation length of fortune water in the fortune water passageway 22, improve the circulation speed of fortune water, improve cooling efficiency.

The first front mold core 1 is provided with small-diameter end insert holes 11 coaxial with the main mold cavity hole 21, a water delivery channel 22 is arranged between each row of small-diameter end insert holes 11, and the water delivery channel 22 is communicated with the water delivery channel 22 on the second front mold core 2, as shown in fig. 3. The small-diameter end insert hole 11 is a stepped hole with two ends of diameter larger than the middle diameter, a large-diameter hole at one end close to the main cavity hole 21 is matched with the insert 5 to form a blood taking needle fixing part on the needle holder, and a large-diameter hole at one end far away from the main cavity hole 21 is used for the boss at the end part of the insert 5 to slide and control the sliding distance.

One side of every aperture end mold insert hole 11 is provided with the point runner 12 that lets in main die cavity hole 21, and point runner 12 diminishes along advancing gluey direction cross-section gradually, and after moulding plastics, the intensity of remaining product material and the product body junction of congealing in point runner 12 is very low, can automatic fracture after the drawing of patterns, need not revise again, reduces manufacturing procedure, improves machining efficiency. The outlet of the spot runner 12 is provided with an arcuate projection 121. The arc convex part enables a concave pit to be formed on the surface of a product during product molding so as to accommodate a residual mark left after the sprue is broken, and the influence of the residual mark on the surface smoothness of the product is avoided.

The rear mold push plate 3 is provided with a large-diameter end insert hole 31 corresponding to the main cavity hole 21. The large diameter end insert hole 31 is a tapered hole and the small diameter end of the tapered hole is adjacent to the main cavity hole 21 and is larger than the maximum inner diameter of the main cavity hole 21. The end, close to the main cavity hole 21, of the large-diameter end insert hole 31 is provided with a first step hole 32, the end, close to the large-diameter end insert hole 31, of the main cavity hole 21 is provided with a second step hole 23, the first step hole 32 and the second step hole 23 are concentric and have the same outer diameter, and the first step hole 32 and the second step hole 23 are used for forming a disc at the end of the needle holder together. The conicity of the side surface of the large-diameter end insert hole 31 is 3-10 degrees. The gap width between the large-diameter end insert hole 31 and the molding surface of the mold core 4 is 0.2-0.5 mm.

The molding assembly further includes a core 4 inserted into the large diameter end insert bore 31 and the main cavity bore 21 and an insert 5 slidably inserted into the small diameter end insert bore 11, one end of the insert 5 being inserted into the core 4. The mold core 4 is inserted into the main cavity hole 21 from the large-diameter end insert hole 31, the insert 5 is inserted into the small-diameter end insert hole 11 from one end far away from the main cavity hole 21, the insert 5 is fixed on an ejection mechanism of the injection mold, after injection molding is completed, the ejection mechanism pushes the mold core 4 towards the main cavity hole 21, a front mold and a rear mold of the injection mold are separated simultaneously, a rear mold push plate 3 moves along with the rear mold, a molded needle holder is separated from the main cavity hole 21 along with the mold core 4, and then the needle holder is taken down from the mold core 4.

Two end faces of the second front die core 2 are provided with positioning grooves 25, the end faces of the first front die core 1 and the rear die push plate 3 adjacent to the second front die core 2 are provided with positioning bosses 13 corresponding to the positioning grooves 25, the positioning bosses 13 are inserted into the positioning grooves 25 in a matching manner, so that the displacement of the first front die core 1 relative to the second front die core 2 or the displacement of the rear die push plate 3 relative to the second front die core 2 in the direction vertical to the axis of the main die cavity hole 21 is limited, and the large-diameter end insert hole 31 and the small-diameter end insert hole 11 are aligned with the axis of the main die cavity hole 21, so as to ensure the forming coaxiality of the needle holder.

Claims

1. The molding assembly of the needle holder injection mold is characterized by comprising a first front mold core (1) and a second front mold core (2) which are overlapped and arranged in a front mold cavity and a rear mold push plate (3) which is arranged in a rear mold cavity, wherein the second front mold core (2) is positioned between the first front mold core (1) and the rear mold push plate (3);

the second front mold core (2) is provided with a plurality of rows, each row comprises a plurality of main cavity holes (21) which penetrate through the second front mold core, the first front mold core (1) is provided with small-diameter end insert holes (11) corresponding to the main cavity holes (21), the rear mold push plate (3) is provided with large-diameter end insert holes (31) corresponding to the main cavity holes (21), the large-diameter end insert holes (31) are conical holes, the small-diameter ends of the conical holes are adjacent to the main cavity holes (21) and are larger than the maximum inner diameter of the main cavity holes (21), and one side of each small-diameter end insert hole (11) is provided with a point pouring channel (12) which is communicated with the main cavity holes (21);

The first front mold core (1) and the second front mold core (2) are both provided with water conveying channels (22); the molding assembly further comprises a core (4) inserted into the large-diameter end insert hole (31) and the main cavity hole (21) and an insert (5) inserted into the small-diameter end insert hole (11) in a sliding manner, and one end of the insert (5) is inserted into the core (4).

2. The molding assembly of the needle holder injection mold according to claim 1, wherein one end of the large diameter end insert hole (31) adjacent to the main cavity hole (21) is provided with a first stepped hole (32), one end of the main cavity hole (21) adjacent to the large diameter end insert hole (31) is provided with a second stepped hole (23), and the first stepped hole (32) and the second stepped hole (23) are concentric and have the same outer diameter.

3. The molding assembly of an injection mold for a needle holder according to claim 1, wherein the taper of the side surface of the large-diameter end insert hole (31) is 3 ° to 10 °.

4. The molding assembly of the needle holder injection mold according to claim 3, wherein the gap width between the large-diameter end insert hole (31) and the molding surface of the core (4) is 0.2-0.5 mm.

5. The molding assembly of the injection mold for the needle holder according to claim 1, wherein the second front mold core (2) is provided with a plurality of water transporting inlets (24) communicated with the water transporting channel (22), and the number of the water transporting inlets (24) is not less than the number of rows of the main mold cavity holes (21).

6. The molding assembly of a needle holder injection mold according to claim 1, characterized in that the section of the point runner (12) is gradually reduced along the glue feeding direction.

7. Molding assembly for a needle holder injection mold according to claim 6, wherein an arc-shaped protrusion (121) is provided at the outlet of the sprue (12).

8. The molding assembly of the injection mold for the needle holder according to claim 1, wherein two end faces of the second front mold core (2) are provided with positioning grooves (25), and the end faces of the first front mold core (1) and the rear mold push plate (3) adjacent to the second front mold core (2) are provided with positioning bosses (13) corresponding to the positioning grooves (25).