Needle handle die structure

Abstract

The utility model relates to a single-blade mold, in particular to a needle handle mold structure, and solves the problem of mold production. Comprising a workpiece, a top die and a bottom die, the bottom die is provided with cavities for casting molding of the workpiece, the cavities are uniformly arranged at intervals along a straight line, each cavity is provided with a shaft core area and a blade area, the cavity is provided with a long-opening hole at the bottom of the blade area, and the bottom die is provided with a round-opening hole close to the shaft core area of the cavity. A linearly-moving plate-shaped push rod is arranged at the long-opening hole, a linearly-moving cylindrical push rod is arranged at the round-opening hole, and the round-opening hole, the shaft core area and the blade area are sequentially connected to form a right angle. The mold is simple in structure, ingenious in design and convenient to operate, greatly improves production efficiency, ensures product quality, avoids the problems of unsmooth demolding, cracking of finished products and the like, and has practicability and economical efficiency.

Description

Technical Field

[0001] The utility model relates to a single-blade mold, in particular to a needle handle mold structure. Background Art

[0002] Among medical devices, there are IV needles that are molded by injection molding, which are the main parts of this type of needle. In particular, the needle has a single-leaf feature and a hole for the metal needle to be inserted. However, most manufacturers divide the main part of the needle into two parts during production, which are molded separately and then assembled together. The reason is that the joint is susceptible to cracking due to shear stress, which may be caused by pouring, mold opening, temperature changes, etc. More importantly, the production efficiency of traditional molds is limited. Even if multiple injection points are imposed, the product cannot be demolded quickly because it is light and small. In general, factors such as mold removal and cracking greatly affect the production efficiency of this type of single-leaf mold. Utility Model Content

[0003] In view of the deficiencies of the existing technology, the utility model provides a needle handle mold structure.

[0004] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a needle handle mold structure, including a workpiece, a top mold and a bottom mold, the bottom mold is provided with a cavity for casting and molding the workpiece, the cavities are evenly spaced along a straight line, the cavity has an axis core area and a blade area, the cavity is provided with a long mouth hole at the bottom of the blade area, and the bottom mold is provided with a circular mouth hole near the axis core area of ​​the cavity, the long mouth hole is provided with a linearly movable plate-shaped push rod, the circular mouth hole is provided with a linearly movable columnar push rod, and the circular mouth hole, the axis core area and the blade area are connected in sequence to form a right angle.

[0005] The columnar push rod and the plate-shaped push rod both have a disk and a cylinder which are integrally connected and coaxial, and the plate-shaped push rod also has a flat push plate portion at one end of the cylinder.

[0006] The workpiece comprises a blade portion, a wide shaft portion and a narrow shaft portion which are connected in sequence. The wide shaft portion and the narrow shaft portion are coaxially arranged, and a chamfer is arranged at a junction of the outer surfaces of the wide shaft portion and the narrow shaft portion.

[0007] It also includes a core shaft, which has a mandrel, a middle shaft part and a bottom plate which are connected in sequence, and a chamfer is arranged at the junction of the outer surfaces of the mandrel and the middle shaft part.

[0008] The bottom mold is also provided with an expansion hole directly connected to the long mouth hole on the end surface. The inner wall surface of the expansion hole near the long mouth hole is an arc surface. The expansion hole is suitable for the disc shape and size of the plate-shaped push rod.

[0009] The circular hole is a step-shaped structure, and the cylindrical push rod is compatible with the shape and size of the circular hole.

[0010] Beneficial effects of the utility model: the needle handle mold provided by the utility model has ingenious structural design and is easy to operate, which greatly improves production efficiency, ensures product quality, avoids problems such as unsmooth demoulding and cracking of finished products, and is practical and economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the assembly structure of the utility model;

[0012] Figure 2 This is a front structural diagram of the bottom mold of the utility model;

[0013] Figure 3 This is a rear view structural diagram of the bottom mold of the utility model;

[0014] Figure 4 This is a schematic diagram of the plate-shaped push rod structure of the utility model;

[0015] Figure 5 It is a schematic diagram of the workpiece structure of the utility model;

[0016] Figure 6 It is a schematic diagram of the core shaft structure of the utility model. DETAILED DESCRIPTION

[0017] like Figure 1-Figure 6 As shown, a needle handle mold structure includes a workpiece 1, a top mold 2 and a bottom mold 3. The bottom mold 3 is provided with a cavity 4 for casting the workpiece 1. The cavities 4 are evenly spaced along a straight line. This is a mature technical means. The cavity 4 is a casting cavity. The cavity 4 has an axial core area 5 and a blade area 6, corresponding to various parts of the workpiece 1. The cavity 4 is provided with a long hole 7 at the bottom of the blade area 6, and the bottom mold 3 is provided with a circular hole 8 near the axial core area 5 of the cavity 4. The long hole 7 is provided with a plate-shaped push rod 9 that moves linearly, and the circular hole 8 is provided with a cylindrical push rod 10 that moves linearly. The circular hole 8, the axial core area 5 and the blade area 6 are connected in sequence to form a right angle. The plate-shaped push rod 9 and the cylindrical push rod 10 push different parts of the workpiece 1 respectively. It should be noted that the top mold 2 and the bottom mold 3 are relatively butt-jointed in the horizontal direction. On this basis, the plate-shaped push rod 9 first partially pushes the workpiece 1 out of the cavity 4, and the blade portion 12 of the workpiece 1 swings down due to the influence of gravity, and the blade portion 12 enters the position of the cylindrical push rod 10. The cylindrical push rod 10 is pushed out almost synchronously, and at this time the cylindrical push rod 10 further demolds the workpiece 1 completely until it falls out. Therefore, the blade portion 12 is at an angle of 90 degrees before and after rotation, which is conducive to the matching structure design. The long hole 7 and the plate-shaped push rod 9 have a rectangular opening or contact surface, which corresponds to the length of the blade portion 12. The cylindrical push rod 10 at the round hole 8 only pushes the workpiece 1 further, and there is no need to ensure uniform force like the plate-shaped push rod 9.

[0018] The cylindrical push rod 10 and the plate-shaped push rod 9 both have a disc and a cylinder that are connected in one piece and coaxially, and the plate-shaped push rod also has a flat push plate portion 11 at one end of the cylinder. The disc is convenient for limiting design, and the push plate portion 11 has a long contact surface that is conducive to smooth demoulding. The workpiece 1 has a blade portion 12, a wide shaft portion 13 and a narrow shaft portion 14 that are connected in sequence. The wide shaft portion 13 and the narrow shaft portion 14 are coaxially arranged, and the wide shaft portion 13 and the narrow shaft portion 14 are provided with a chamfer at the junction of the outer surface. The workpiece 1 here is mainly limited to being connected in one piece and having a chamfer, which does not affect the use of the original function and also strengthens the local structural strength. It also includes a mandrel 15, which has a mandrel 16, a middle shaft portion 17 and a chassis 18 that are connected in sequence, and the mandrel 16 and the middle shaft portion 17 are provided with a chamfer at the junction of the outer surface. The design of the mandrel 15 ensures the reliability of integrated casting and is also convenient for demoulding and use.

[0019] The bottom mold 3 is also provided with a flared hole 19 on the end surface, which is directly connected to the long mouth hole 7. The inner wall surface of the flared hole 19 near the long mouth hole 7 is an arc surface, and the flared hole 19 is compatible with the disc shape and size of the plate-shaped push rod 9. In order to avoid the air being pressed into the cavity 4 due to the strong air tightness, a margin space is left for this purpose, that is, the flat disc and the arc surface cannot be completely fitted. The circular mouth hole 8 is a step-shaped structure, and the cylindrical push rod 10 is compatible with the shape and size of the circular mouth hole 8, which is conducive to the design of the limiting structure. This is a relatively mature technical means, and it will not be elaborated and limited too much here.

[0020] In the description of the present invention, it should be noted that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention. At the same time, the basic principles, main features and advantages of the present invention are shown and described above, which should be understood by technicians in this industry.

Claims

1. A needle handle mold structure, comprising a workpiece, a top mold and a bottom mold, wherein the bottom mold is provided with cavities for casting the workpiece, and the cavities are evenly spaced along a straight line, characterized in that: The cavity has an axial core area and a blade area. The cavity is provided with a long hole at the bottom of the blade area, and the bottom mold is provided with a circular hole near the axial core area of ​​the cavity. A linearly movable plate-shaped push rod is provided at the long hole, and a linearly movable columnar push rod is provided at the circular hole. The circular hole, the axial core area and the blade area are connected in sequence to form a right angle.

2. A needle handle mold structure as claimed in claim 1, characterized in that: The columnar push rod and the plate-shaped push rod both have a disk and a cylinder which are integrally connected and coaxial, and the plate-shaped push rod also has a flat push plate portion at one end of the cylinder.

3. A needle handle mold structure as claimed in claim 1 or 2, characterized in that: The workpiece comprises a blade portion, a wide shaft portion and a narrow shaft portion which are connected in sequence. The wide shaft portion and the narrow shaft portion are coaxially arranged, and a chamfer is arranged at a junction of the outer surfaces of the wide shaft portion and the narrow shaft portion.

4. A needle handle mold structure as claimed in claim 3, characterized in that: It also includes a core shaft, which has a mandrel, a middle shaft part and a bottom plate which are connected in sequence, and a chamfer is arranged at the junction of the outer surfaces of the mandrel and the middle shaft part.

5. A needle handle mold structure as claimed in claim 2, characterized in that: The bottom mold is also provided with an expansion hole directly connected to the long mouth hole on the end surface. The inner wall surface of the expansion hole near the long mouth hole is an arc surface. The expansion hole is suitable for the disc shape and size of the plate-shaped push rod.

6. A needle handle mold structure as claimed in claim 2, characterized in that: The circular hole is a step-shaped structure, and the cylindrical push rod is compatible with the shape and size of the circular hole.

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