CN201357547Y

CN201357547Y - Needle jet

Info

Publication number: CN201357547Y
Application number: CNU2009200676998U
Authority: CN
Inventors: 杜雅
Original assignee: SHANGHAI FEISHA INSTRUMENT CO Ltd
Current assignee: Shanghai MIYAB Hot Runner Technology Co., Ltd.
Priority date: 2009-02-13
Filing date: 2009-02-13
Publication date: 2009-12-09
Anticipated expiration: 2019-02-13

Abstract

A needle jet comprises a jet body, a jet head and a valve needle, wherein a circular truncated cone is arranged at the front end of the valve needle. When the jet is closed, the conical surface of the circular truncated cone clings to a corresponding circular truncated cone hole formed on the jet head so as to form a sealing surface. When the jet is open, a conical annular flow passage is formed between the conical surface of the circular truncated cone and the circular truncated cone hole on the jet head. The conical degree of the circular truncated cone ranges from 20 degrees to 120 degrees. The jet adopts the circular truncated cone sealing surface, and the wall thickness of a formed component is not limited by the length of the sealing surface of the jet. When the thin-wall formed component is used, the injection molding jet meets use requirements. The closing reliability of a needle valve is improved.

Description

Needle jet

Technical field

The utility model relates to the fluid tip structure, particularly the injection-moulding nozzle structure.

Background technology

Existing a kind of injection-moulding nozzle sees also Fig. 1-5, and it comprises: nozzle head 11, heat transfer jacket 12, spring 13, fairlead 14, needle 15, body 16, and wherein, when needle 15 shifted forward, jet hole was opened, and fluid can be by flowing out through jet hole 17 in the nozzle.This structure is that the cylindrical length of needle 15 front ends is S, and this cylinder and nozzle head 11 front end endoporus form the cylinder sealing surface.Therefore S is also referred to as sealed nozzle face length degree.Needle moves forward the restriction that distance H is subjected to profiled member wall thickness M, and when needle moved forward distance H fully greater than sealed nozzle face length degree S, nozzle just can be opened, as shown in Figure 3.There is following shortcoming in this structure: 1, when profiled member wall thickness M limited needle move forward apart from the time, jet hole can not fully be opened, as shown in Figure 4.2, when the needle front end of nozzle retreated under the state of off-centre, needle can be stuck on the end face of nozzle head, needle-valve can not be shut, as shown in Figure 5.Therefore this injection-moulding nozzle is in the use occasion of shaping thin wall spare, and profiled member wall thickness M can move forward distance by the limits nozzle needle, can not satisfy user demand, and necessity of improvement is arranged in fact.

The utility model content

The purpose of this utility model is to provide a kind of novel injection moulding needle jet, overcomes the above-mentioned shortcoming of prior art.

For achieving the above object, solution of the present utility model is: a kind of needle jet, comprise nozzle body, nozzle head, needle, this needle front end has one section frustum of a cone, under the nozzle closing state, the formation sealing surface is pasted in the corresponding frustum of a cone hole that is provided with on the conical surface of this frustum of a cone and the nozzle head mutually; Under the state that nozzle is opened, form the circular cone annular channel between the conical surface of this frustum of a cone and the frustum of a cone hole on the nozzle head.

Further, the range of taper of this frustum of a cone is the 20-120 degree.

If the diameter of jet hole is the 1-4 millimeter, the length L of the frustum of a cone is the 0.1-1 millimeter.

If the diameter of jet hole is the 4-10 millimeter, the length L of the frustum of a cone is the 0.3-3 millimeter.

If the diameter of jet hole is the 10-20 millimeter, the length L of the frustum of a cone is the 1-8 millimeter.

Owing to adopted such scheme, the utility model that following advantage is arranged: nozzle adopts frustum of a cone sealing surface, and when the distance that moves forward when needle was spent less than the sealed nozzle face length, nozzle also can fully be opened.The distance that needle moves forward is not limited by sealed nozzle face length degree, and injection-moulding nozzle has satisfied the use needs in the use occasion of shaping thin wall spare.The reliability of closing of needle-valve improves.

Description of drawings

Fig. 1 is the existing generalized section of nozzle arrangements under the nozzle closing state.

Fig. 2 is the existing generalized section of nozzle arrangements under the state that nozzle is opened.

Fig. 3 has the generalized section of normally opening when nozzle arrangements cooperates with profiled member under the situation now.

Fig. 4 be existing nozzle arrangements when cooperating with profiled member the profiled member wall thickness less than the generalized section of sealed nozzle face length degree.

Fig. 5 is existing nozzle arrangements needle profile when being stuck in the section of nozzle head.

Fig. 6 is the generalized section of the utility model embodiment under the state that nozzle is opened.

Fig. 7 is an axial schematic diagram embodiment illustrated in fig. 6.

Fig. 8 is the nozzle oral area generalized section of the utility model embodiment under the state that nozzle is opened.

Fig. 9 is the generalized section of the utility model embodiment nozzle degree of opening when cooperating with shaping thin wall spare.

Figure 10 is the generalized section of the utility model embodiment under the nozzle closing state.

Figure 11 is the structure for amplifying schematic diagram of the frustum of a cone of the utility model embodiment needle jet.

The specific embodiment

See also accompanying drawing 6-11, a kind of injection moulding needle jet, fairlead 4 and being connected of needle 5 can simply load and unload, and can be to be threaded or additive method.

Its structure comprises: nozzle head 1, heat transfer jacket 2, spring 3, fairlead 4, needle 5, body 6, fairlead 4 have makes needle-valve 5 remain on the center and with the effect of needle-valve 5 in axial location.Fairlead 4 is provided with spring 3, and this fairlead 4 is embedded in the pilot hole 116 of nozzle body, which is provided with the inflow entrance 117 of liquid plastic, and needle-valve locating hole 9 is arranged with spring 3 on the needle 5, and tail end inserts in this needle-valve locating hole 9 and is connected with fairlead 4.Employing activity connecting mode between needle 5 and the fairlead 4 for example, can be to be threaded, and also can be that pin connects, and can load and unload simply.The end face of heat transfer jacket 2 carries out axial constraint to fairlead 4 other ends.Fairlead 4 can move axially in the pilot hole 116 of nozzle body.During injection moulding, act on injection pressure on the needle 5 and then begin spring 3 compressions when enough big, before needle 5 is pushed to, jet hole 111 is opened, as shown in Figure 6.After injection mo(u)lding was finished, injection pressure descended, and the elastic force of spring 3 is return needle-valve 5, and jet hole 111 is closed, as shown in figure 10.

The front end of needle 5 of the present utility model is provided with one section frustum of a cone 51, and under the nozzle closing state, the corresponding frustum of a cone hole 112 that is provided with on the conical surface 511 of this frustum of a cone 51 and the nozzle head is pasted mutually and formed sealing surface; Under the state that nozzle is opened, the conical surface 511 of this frustum of a cone 51 and the gap between the frustum of a cone hole 112 on the nozzle head 1 promptly form the circular cone annular channel, as shown in Figure 8.Wherein, the cone angle A scope of the frustum of a cone 51 is the 20-120 degree; The length of the frustum of a cone 51 generally determines according to the bore of jet hole 111, and for example concerning the diameter of jet hole was the product of 1-4 millimeter, the length L of the frustum of a cone can be the 0.1-1 millimeter; Concerning the diameter of jet hole was the product of 4-10 millimeter, the length L of the frustum of a cone can be the 0.3-3 millimeter; Concerning the diameter of jet hole was the product of 10-20 millimeter, the length L of the frustum of a cone can be the 1-8 millimeter.

The utility model nozzle adopts frustum of a cone sealing surface, and the distance that the needle of nozzle moves forward is not limited by sealed nozzle face length degree, and injection-moulding nozzle satisfies and uses needs, as shown in Figure 9 in the use occasion of shaping thin wall spare.The reliability of closing of needle-valve improves.

The above-mentioned description to embodiment is can understand and use the utility model for ease of those skilled in the art.The person skilled in the art obviously can easily make various modifications to these embodiment, and needn't pass through performing creative labour being applied in the General Principle of this explanation among other embodiment.Therefore, the utility model is not limited to the foregoing description, and those skilled in the art should be within protection domain of the present utility model for improvement and modification that the utility model is made according to announcement of the present utility model.

Claims

1, a kind of needle jet comprises nozzle body, nozzle head, needle, it is characterized in that: this needle front end has one section frustum of a cone, and under the nozzle closing state, the formation sealing surface is pasted in the corresponding frustum of a cone hole that is provided with on the conical surface of this frustum of a cone and the nozzle head mutually; Under the state that nozzle is opened, form the circular cone annular channel between the conical surface of this frustum of a cone and the frustum of a cone hole on the nozzle head.

2, needle jet according to claim 1 is characterized in that: the range of taper of this frustum of a cone is the 20-120 degree.

3, needle jet according to claim 1 is characterized in that: the diameter of jet hole is the 1-4 millimeter, and the length L of the frustum of a cone is the 0.1-1 millimeter.

4, needle jet according to claim 1 is characterized in that: the diameter of jet hole is the 4-10 millimeter, and the length L of the frustum of a cone is the 0.3-3 millimeter.

5, needle jet according to claim 1 is characterized in that: the diameter of jet hole is the 10-20 millimeter, and the length L of the frustum of a cone is the 1-8 millimeter.