阅读说明：本技术 中弹簧封胶射嘴 (Middle spring glue sealing nozzle ) 是由 高建平 肖加云 肖锐 于 2021-08-04 设计创作，主要内容包括：本发明公开了一种中弹簧封胶射嘴,包括依次装配连接的子射咀、中射咀和法兰连接体,法兰连接体前端的装配腔内设置阀套,阀套的后端外部套设弹簧,其中：阀套上沿其轴向开设有顶针盲孔和若干布置于顶针盲孔外周的注射流道,其周体开设有至少一个沿径向布置且连通顶针盲孔的方形通孔；方形通孔内插设有定位块,定位块的两端与弹簧的前端侧相抵接,中部与设置于顶针盲孔内的阀针的后端侧相抵接。该中弹簧封胶射嘴将弹簧套设在阀套的外部,并通过阀套上的定位块连接弹簧和阀针,实现阀针的自动封胶,避免了阀针阀套前后摩擦运动时从配合间隙内溢出的塑料将弹簧包裹的缺陷,保证了弹簧的正常使用,且其使用范围广,可适应大背压的工况。(The invention discloses a middle spring sealing glue nozzle, which comprises a sub-nozzle, a middle nozzle and a flange connector which are sequentially assembled and connected, wherein a valve sleeve is arranged in an assembly cavity at the front end of the flange connector, and a spring is sleeved outside the rear end of the valve sleeve, wherein: the valve sleeve is provided with an ejector pin blind hole and a plurality of injection flow channels arranged on the periphery of the ejector pin blind hole along the axial direction of the valve sleeve, and the periphery of the valve sleeve is provided with at least one square through hole which is arranged along the radial direction and is communicated with the ejector pin blind hole; the square through hole is internally inserted with a positioning block, two ends of the positioning block are abutted against the front end side of the spring, and the middle part of the positioning block is abutted against the rear end side of the valve needle arranged in the thimble blind hole. This well spring seals glues and penetrates the mouth and establish the spring housing in the outside of valve barrel to through locating piece connection spring and needle on the valve barrel, realize that the automation of needle seals the glue, the plastics that spills over in following fit clearance when having avoided needle valve barrel friction motion are with the defect of spring parcel, have guaranteed the normal use of spring, and its application range is wide, the operating mode of adaptable big backpressure.)

1. Well spring seals glues and penetrates mouth, penetrate including the sub-of erection joint in proper order and chew (10), well penetrating (20) and flange connector (30), its characterized in that, set up valve barrel (50) in assembly chamber (31) of flange connector (30) front end, spring (60) are established to the outside cover in rear end of valve barrel (50), wherein:

the valve sleeve (50) is provided with an ejector pin blind hole (51) and a plurality of injection flow channels (53) arranged on the periphery of the ejector pin blind hole (51) along the axial direction, and the periphery of the valve sleeve is provided with at least one square through hole (54) which is arranged along the radial direction and is communicated with the ejector pin blind hole (51);

a positioning block (80) is inserted into the square through hole (54), two ends of the positioning block (80) are abutted against the front end side of the spring (60), and the middle part of the positioning block is abutted against the rear end side of the valve needle (40) arranged in the thimble blind hole (51).

2. The nozzle as claimed in claim 1, wherein the square through hole (54) is not connected to the injection runner (53) and is disposed in a staggered manner.

3. The middle spring sealing compound nozzle as claimed in claim 1, wherein a flow extending portion (52) is disposed at a front end side of the valve sleeve (50), the flow extending portion (52) is located between the thimble blind hole (51) and the injection runner (53), and an outer diameter of the flow extending portion is greater than or equal to a diameter of a rear end fitting portion of the valve needle (40).

4. The middle spring sealing compound nozzle as claimed in claim 1, wherein a flow dividing cavity (55) is opened at a rear end side of the valve sleeve (50), and an end surface of the flow dividing cavity (55) is a tapered surface (56) extending to the plurality of injection runners (53).

5. The middle spring sealing compound nozzle as claimed in claim 1, wherein the rear end of the valve needle (40) is embedded in the blind hole (51) of the thimble at the front end of the valve sleeve (50) with a clearance.

6. The middle spring sealing compound nozzle as claimed in claim 1, wherein the diameter of the front end of the valve needle (40) is smaller than the diameter of the matching part of the rear end of the valve needle and the valve sleeve (50), and the diameter of the matching part gradually increases to form a smooth transition to the injection flow channel (53).

7. The middle spring sealing compound nozzle as claimed in claim 1, wherein the flange connector (30) has a feeding channel (32) formed at a rear end thereof along an axial direction thereof and communicating with the plurality of injection channels (53), and the feeding channel (32) has an open front end.

8. The nozzle as claimed in claim 1, wherein at least one observation window (34) is formed on the periphery of the front end of the flange connector (30) at a position corresponding to the spring (60).

9. The middle spring sealing glue nozzle according to claim 1, wherein the positioning block (80) is a rib shape with a bar shape, a Y shape, a cross shape or a support leg n of 5-10.

10. The nozzle as claimed in claim 1, further comprising a gasket (70) disposed between the positioning block (80) and the spring (60), wherein an inner ring of the gasket (70) is snap-connected to two ends of the positioning block (80).

11. The middle spring sealing compound nozzle as claimed in claim 1, wherein the outer diameter of the spring (60) is 10-250mm, the linear diameter is 2-20mm, and the length is 20-300 mm.

12. The nozzle as claimed in claim 1, wherein the nozzle has an overall length of 50-500mm and an outer diameter of 25-250 mm.

Technical Field

The invention relates to the technical field of injection molding, in particular to a middle spring sealing adhesive nozzle.

Background

At present, injection molding products are widely applied in the industries of automobiles, electronics, connectors and the like, and the most used in the industries are high-temperature engineering plastics (such as PA, PPS, PBT, LCP and the like), and the high-temperature engineering plastics are easy to generate glue overflow or wire drawing in the production process, so that the appearance, the weight and the size of the products are extremely badly influenced. At present, as demand of fast cycle products (such as PP fast food boxes, PE medicine bottles, new coronavirus detection bottles and the like) is getting larger and larger, cooling time of plastics in a mold and a flow passage is not enough as the production cycle is faster, and a flow stopping device is usually added on a nozzle in the industry to prevent the plastics with certain internal pressure from flowing outwards in a material cutting pipe or the nozzle. Such nozzles have been known in the art, and patent technologies such as pneumatic glue nozzles, linkage valve needle glue nozzles, radial valve needle glue nozzles, inner spring nozzles, pneumatic and linkage valve needle glue nozzles, and radial valve needle glue nozzles have been applied to jiekang, but most customers abandon the nozzles because of their high prices.

The inner spring nozzle is the final choice of many customers, and has the advantages of highest cost performance, convenient installation and almost the same installation mode as the common nozzle. However, the inner spring nozzle often wraps the spring due to powder overflowing from the fit clearance when the valve needle and the valve sleeve move back and forth in a friction mode, and the problem that the spring fails after a long time is caused. The outer diameter of the spring cannot be designed to be too large due to the diameter factor of the nozzle, so that a visual spring sealing glue nozzle which cannot be wrapped by powder is urgently needed to be developed to solve the problems.

Disclosure of Invention

The technical problems to be solved by the invention are as follows: aiming at the defect that the next mould product is unstable due to continuous plastic flowing out of the nozzle after the injection action or the sol action of the existing nozzle is finished, a novel middle spring glue sealing nozzle assembled at the front end of a material pipe of an injection molding machine is provided.

In order to achieve the purpose, the invention adopts the following technical scheme:

the utility model provides a well spring seals glues and penetrates mouth, penetrates including sub-penetrating of be assembled between/be connected between in proper order and chew and the flange connector, the assembly intracavity of flange connector front end sets up the valve barrel, the spring is established to the outside cover of rear end of valve barrel, wherein:

the valve sleeve is provided with an ejector pin blind hole and a plurality of injection flow channels arranged on the periphery of the ejector pin blind hole along the axial direction of the valve sleeve, and the periphery of the valve sleeve is provided with at least one square through hole which is arranged along the radial direction and is communicated with the ejector pin blind hole;

the positioning block is inserted into the square through hole, two ends of the positioning block are abutted to the front end side of the spring, the middle of the positioning block is abutted to the rear end side of the valve needle arranged in the thimble blind hole, and the positioning block moves in the square through hole under the resilience force of the spring so as to push the valve needle to plug the inner hole of the sub-injection nozzle.

Furthermore, the square through holes are not communicated with the injection flow channel and are arranged in a staggered mode.

Further, the cross section of the injection runner is circular, oval, arc-shaped or square or other regular or irregular shapes.

Furthermore, the front end side of the valve sleeve is provided with a flow extending part, the flow extending part is positioned between the thimble blind hole and the injection flow channel, and the outer diameter of the flow extending part is larger than or equal to the diameter of the matching part of the rear end of the valve needle.

Furthermore, a diversion cavity is formed in the rear end side of the valve sleeve, and the end face of the diversion cavity is a conical surface extending to the plurality of injection flow passages.

Furthermore, the rear end of the valve needle is embedded in a thimble blind hole at the front end of the valve sleeve in a clearance mode.

Further, the diameter of the front end of the valve needle is smaller than that of a matching part of the rear end of the valve needle corresponding to the valve sleeve, and the diameter of the matching part is gradually increased and smoothly transits to the injection flow channel.

Furthermore, at least one observation window is arranged on the periphery of the front end of the flange connecting body corresponding to the spring.

Further preferably, a plurality of indicating grooves are formed in the peripheral body at the front end of the flange connecting body along the axial direction of the peripheral body, and at least one observation window is formed in each indicating groove.

Furthermore, the positioning block is a strip-shaped rib with a Y-shaped, cross-shaped or 5-10 support legs n.

Further, the spring positioning device further comprises a gasket arranged between the positioning block and the spring, and the inner ring of the gasket is connected with the two ends of the positioning block in a buckling mode.

Furthermore, the outer diameter of the spring is 10-250mm, the wire diameter is 2-20mm, and the length is 20-300 mm.

Furthermore, the whole length of the middle spring sealing glue nozzle is 50-500mm, and the outer diameter is 25-250 mm.

Furthermore, the sub-injection nozzle, the middle injection nozzle and the flange connecting body are assembled and connected through threads.

Further preferably, the rear end of the sub-nozzle is in threaded assembly connection with the inner hole at the front end of the middle nozzle.

Furthermore, a feeding flow channel communicated with the plurality of injection flow channels is formed in the rear end of the flange connecting body along the axial direction of the flange connecting body, and the front end of the feeding flow channel is in an open shape.

Further preferably, the outer part of the rear end of the middle nozzle is in threaded assembly connection with an assembly cavity at the front end of the flange connector, and an inner hole at the rear end of the middle nozzle is open at a position corresponding to the matching position of the rear end of the valve needle.

Further preferably, the valve sleeve is assembled in the assembly cavity in a limiting mode, the front end of the valve sleeve is abutted against the middle nozzle, and the rear end of the valve sleeve is abutted against the rear end wall of the assembly cavity.

By adopting the technical scheme, compared with the prior art, the invention has the following technical effects:

(1) under the condition of ensuring that the diameter of the jet nozzle is not changed, the spring is sleeved outside the valve sleeve, and the spring and the valve needle are connected through the positioning block on the valve sleeve, so that the automatic sealing of the valve needle is realized, the defect that the spring is wrapped by plastic overflowing from a fit clearance when the valve needle and the valve sleeve move in a front-back friction mode is avoided, and the normal use of the spring is ensured;

(2) compared with the existing spring nozzle, the spring nozzle has the advantages that the inner diameter, the outer diameter and the inner diameter of the spring can be greatly increased by increasing the outer diameter, the wire diameter and the inner diameter of the spring, so that the service life of the spring is effectively prolonged, the production cost is reduced, and the production efficiency is improved;

(3) when the nozzle is used, the condition of the flash of the valve needle and the state of the spring can be clearly observed through the observation window, and compared with the problem that the nozzle is difficult to overhaul, the nozzle can clearly see whether the valve needle acts or not in use, fault troubleshooting is convenient and quick, and disassembly is not needed;

(4) the middle spring sealing glue nozzle is simple and novel in structural design, reliable and stable in valve needle sealing action under the action of the spring, wide in application range and adaptable to the working condition of large back pressure, and plastic is effectively prevented from continuously flowing out of the opening of the nozzle after injection action or sol action is completed.

Drawings

FIG. 1 is a schematic view of an overall structure of a middle spring molding nozzle according to the present invention;

FIG. 2 is a schematic cross-sectional view of a valve needle in a middle spring molding nozzle in a closed state according to the present invention;

FIG. 3 is a schematic cross-sectional view of a valve needle in a middle spring molding nozzle in an open state according to the present invention; (ii) a

FIG. 4 is a first view illustrating an assembly structure of a middle spring molding nozzle according to the present invention;

FIG. 5 is a schematic view of an assembly structure of a middle spring molding nozzle according to the present invention;

FIG. 6 is a first schematic perspective view of a flange connector in a middle spring molding nozzle according to the present invention;

FIG. 7 is a second schematic perspective view of a flange connector in a middle spring molding nozzle according to the present invention;

FIG. 8 is a schematic structural diagram of a flange connector in a middle spring molding nozzle according to the present invention;

FIG. 9 is a schematic cross-sectional view of a flange connector in a middle spring molding nozzle according to the present invention;

FIG. 10 is a first schematic view of a valve sleeve of a middle spring molding nozzle according to the present invention;

FIG. 11 is a schematic perspective view of a valve sleeve in a middle spring molding nozzle according to a second embodiment of the present invention;

FIG. 12 is a schematic view of a valve sleeve of a middle spring molding nozzle according to the present invention;

FIG. 13 is a first schematic sectional view of a valve sleeve of a middle spring molding nozzle according to the present invention;

FIG. 14 is a schematic sectional view of a valve sleeve in a middle spring molding nozzle according to a second embodiment of the present invention;

FIG. 15 is a left side view of the valve sleeve of the middle spring molding nozzle of the present invention;

FIG. 16 is a schematic diagram of a right view of a valve sleeve in a middle spring molding nozzle according to the present invention;

FIG. 17 is a schematic view of an assembly structure of a positioning block and a gasket in a middle spring molding nozzle according to the present invention;

wherein the reference symbols are:

10-sub nozzle; 20-a middle nozzle; 30-flange connector, 31-assembly cavity, 32-feeding runner, 33-indicating groove and 34-observation window; 40-valve needle; 50-a valve sleeve, 51-a thimble blind hole, 52-a flow extending part, 53-an injection flow channel, 54-a square through hole, 55-a diversion cavity and 56-a conical surface; 60-a spring; 70-gasket, 71-card slot; 80-positioning block, 81-fixture block.

Detailed Description

The present invention will be described in detail and specifically with reference to the following examples to facilitate better understanding of the present invention, but the following examples do not limit the scope of the present invention.

In some embodiments, as shown in fig. 1, fig. 2, fig. 3, fig. 4 and fig. 5, in order to solve the defect that the next mold product is unstable due to the continuous plastic flowing out of the nozzle after the injection or sol injection is completed, a novel middle spring sealing glue nozzle assembled at the front end of the material pipe of the injection molding machine is provided. The middle spring glue sealing nozzle mainly comprises a sub-nozzle 10, a middle nozzle 20 and a flange connecting body 30 which are sequentially assembled and connected, a valve needle 40 is assembled in inner holes of the sub-nozzle 10 and the middle nozzle 20, a valve sleeve 50 with a specific structure is arranged in an assembling cavity 31 at the front end of the flange connecting body 30, and a spring 60 is sleeved outside the rear end of the valve sleeve 50. The main function of the spring 60 is to control the return of the needle 40 to close the nozzle orifice and prevent the plastics material from continuing to flow out of the nozzle orifice after the injection or sol injection event is completed.

As shown in fig. 2, 3, 4 and 5, the spring sealing compound nozzle creatively sleeves the spring 60 outside the valve housing 50 and outside the injection flow channel 53, compared with the prior art in which a pressure spring is arranged in the middle of the nozzle intermediate body, the spring 60 with a larger size is adopted on the basis of not increasing the diameter of the nozzle, thereby overcoming the bias that the outer diameter of the spring cannot be designed too large due to the diameter factor of the nozzle. This well spring seals glues and penetrates mouth through the external diameter, line footpath and the internal diameter that increase spring 60, makes spring 60 inside and outside footpath and line footpath can increase a lot, has effectively increased spring 60's life, has reduced manufacturing cost to production efficiency has been improved.

Specifically, as shown in fig. 10, 11 and 12, the valve sleeve 50 is provided with an ejector pin blind hole 51 along an axial direction thereof and a plurality of injection flow channels 53 arranged on an outer periphery of the ejector pin blind hole 51, the ejector pin blind hole 51 is located at a front end axial position of the valve sleeve 50, and a front end side thereof is opened for fitting the valve needle 40, and the plurality of injection flow channels 53 are arranged around the ejector pin blind hole 51 on an outer side thereof for injecting the plastic fluid into the mold. In addition, at least one square through hole 54 which is arranged along the radial direction and is communicated with the thimble blind hole 51 is also arranged on the periphery of the valve sleeve 50; a positioning block 80 is movably inserted into the square through hole 54, and the positioning block 80 can move back and forth in the square through hole 54 along the axial direction under the action of external force, wherein the external force comprises the acting force for pushing the valve needle 40 to retreat by using the plastic fluid pressure difference and the resilience force of the spring 60.

In the actual use process, two ends of the positioning block 80 extend out of the square through hole 54 and are abutted against the front end side of the spring 60, the middle part of the positioning block 80 positioned in the square through hole 54 is abutted against the rear end side of the valve needle 40 movably arranged in the thimble blind hole 51, and the valve needle 40 is mechanically connected with the spring 60 through the positioning block 80. After the injection or sol injection is completed, the positioning block 80 moves in the square through hole 54 under the resilience of the spring 60 to push the valve needle 40 to block the inner hole of the sub-nozzle 10.

In some preferred embodiments, as shown in fig. 13, 14, 15 and 16, in order to prevent plastic fluid in the injection channel 53 from entering the square through hole 54 and blocking the spring 60 and the positioning block 80 from returning, the square through hole 54 is not communicated with the injection channel 53 above the valve sleeve 50, and the square through hole 54 and the injection channel 53 are arranged in a staggered manner, i.e. the injection of the plastic fluid in the injection channel 53 is not affected, and the returning of the positioning block 80 in the square through hole 54 is not affected.

In some preferred embodiments, as shown in fig. 10 and 11, the cross-section of the individual injection flow channels 53 is circular, oval, curved or square or other regular or irregular shape. Preferably, the injection flow passage 53 may have 1 annular or semi-annular structure, and may also have 2 semi-annular structures.

In some preferred embodiments, as shown in fig. 10, 12, 13, 14 and 15, plastic fluid flowing through the injection channel 53 in the valve sleeve 50 is facilitated to smoothly enter the inner bore of the middle nozzle 20, while plastic fluid is prevented from entering the gap at the fitting of the valve needle 40 and the valve sleeve 50. The front end side of the valve sleeve 50 is provided with a flow extending part 52, the flow extending part 52 is positioned between the thimble blind hole 51 and the injection flow channel 53, mainly plays a role of backflow, and the outer diameter of the flow extending part 52 is larger than or equal to the diameter of the matching part of the rear end of the valve needle 40, so that the plastic fluid flowing out of the injection flow channel 53 continuously enters the flow channel between the valve needle 40 and the inner hole of the middle nozzle 20 along the flow extending part 52.

In some preferred embodiments thereof, as shown in fig. 11, 12, 13, 14 and 16, the plastic fluid in the feed channel 32 at the rear end of the flange connection body 30 can be divided into multiple streams to flow smoothly into the corresponding injection channels 53. The rear end side of the valve sleeve 50 is provided with a diversion cavity 55, the end surface of the diversion cavity 55 is a conical surface 56 extending to a plurality of injection flow channels 53, and the diversion cavity 55 mainly plays a role in buffering backflow and is mainly used for diverting plastic fluid entering the feeding flow channel 32 into each injection flow channel 53 so as to reduce the injection resistance and pressure of the plastic fluid.

In some of these embodiments, as shown in fig. 2 and 3, the clearance at the point where the needle 40 and the valve sleeve 50 are engaged is of great importance in order to avoid plastic fluid entering the gap between the needle 40 and the valve sleeve 50, causing the needle 40 to become stuck within the valve sleeve 50. The rear end of the valve needle 40 is embedded in the blind hole 51 of the thimble at the front end of the valve sleeve 50 in a clearance manner, too large fit clearance can cause plastics to flow out from the clearance, and too small fit clearance can cause the valve needle 40 and the valve sleeve 50 to be clamped. In addition, besides the arrangement of the fit clearance, a wear-resistant lubricating coating can be integrally arranged on the surfaces of the valve needle 40 and the valve sleeve 50, and the coating mainly comprises vacuum coating coatings such as CRN, TIN, DLC and the like so as to improve the lubricating performance between the valve needle 40 and the valve sleeve 50, so that the problem that the valve needle 40 and the valve sleeve 50 are clamped due to the excessively small fit clearance can be avoided, and the problem that plastic fluid enters the clearance between the valve needle 40 and the valve sleeve 50 to cause the clamping due to the excessively large fit clearance can be avoided.

In some embodiments, as shown in fig. 2, 3 and 5, in order to realize the backward movement of the valve needle 40 by using the principle of fluid pressure difference, the diameter of the front end of the valve needle 40 is required to be smaller than that of the matching part of the rear end of the valve needle with the valve sleeve 50, and the valve needle 40 can be configured in a multi-section structure according to requirements, and the diameter of the multi-section structure gradually increases from the front end to the rear end, and the diameter of the matching part of the rear end of the valve needle 40 and the valve sleeve 50 gradually increases to be smoothly transited to the injection flow channel 53.

In some embodiments, as shown in fig. 2, 3 and 9, a feeding channel 32 communicating with a plurality of injection channels 53 is opened at the rear end of the flange connecting body 30 along the axial direction thereof, and the front end of the feeding channel 32 is open, the opening at the front end of the feeding channel 32 is the same as the diameter of the distributing chamber 55 at the rear end of the valve sleeve 50, and the feeding channel 32 and the distributing chamber are connected in a seamless manner and smoothly transited, so that the plastic fluid passing through the feeding channel 32 can enter the distributing chamber 55 in a seamless manner.

In some embodiments, as shown in fig. 2, 3, 6, 7, 8 and 9, at least one observation window 34 is formed on the peripheral body of the front end of the flange connector 30 at a position corresponding to the spring 60. Preferably, the number of the observation windows 34 is 2-5, and the observation windows are arranged on the circumference of the front end of the flange connecting body 30 at equal intervals. Preferably, there are 3 viewing windows 34.

In some preferred embodiments, as shown in fig. 2, 3, 6, 7, 8 and 9, an external thread is provided on the outer diameter of the right tail of the flange connector 30, a wrench position is provided on the outer peripheral body of the middle of the flange connector 30, a plurality of indication grooves 33 are provided on the peripheral body of the front end of the wrench position along the axial direction thereof, and at least one observation window 34 is provided in the indication grooves 33. Preferably, the observation window 34 is at least one through hole penetrating through the flange connector 30, when in use, the condition of the flash of the valve needle 40 and the state of the spring 60 can be clearly observed from the observation window 34, and compared with the problem of difficult maintenance of the inner spring nozzle, the troubleshooting is more convenient and faster.

In some of these embodiments, as shown in fig. 2, 3, 6, 7, 8 and 9, the positioning block 80 serves as a centrally located structure mounted on the valve sleeve 50, and its main function is to achieve a connection between the spring 40 and the valve needle 40, thereby structurally constituting a force transmission process. As shown in fig. 2, in the closed state of the valve needle 40, before injection, the resilience of the spring 60 makes the valve needle 40 tangent to the inner hole of the sub-nozzle 10, and at this time, the lead of the spring 60 increases, and the valve needle 40 is closed. As shown in fig. 3, in the open state of the valve needle 40, the pressurized plastic fluid forcibly retracts the valve needle 40, the spring 60 is compressed by the positioning block 80 with a reduced lead, and the pressurized plastic fluid enters the mold through the nozzle opening at the front end of the sub-nozzle 10. As shown in fig. 3, after the injection or sol injection is completed, the pressure of the plastic fluid is reduced, and the positioning block 80 moves in the square through hole 54 under the resilience of the spring 60, and synchronously pushes the valve needle 40 to close the nozzle opening of the sub-nozzle 10, so as to prevent the plastic from continuously flowing out of the nozzle opening after the injection or sol injection is completed.

In some preferred embodiments, as shown in fig. 4, 5 and 17, the positioning block 80 may have a bar structure, a Y-shaped structure, a cross-shaped structure or a rib structure with 5-10 legs n, as required. The outer end of the positioning block 80 is connected with the spring 60, and the more the ends of the positioning block 80 are, the more uniform the stress is. Preferably, the positioning block 80 is a bar structure, a Y-shaped structure or a cross-shaped structure, and the bar structure having two ends is convenient for installation. More preferably, a Y-shaped structure or a cross-shaped structure with three and four ends is adopted, so that the spring 60 can be fully contacted with the front end of the spring, the stress is more uniform, and the service life of the spring 60 is prolonged.

In some preferred embodiments, as shown in fig. 4, 5 and 17, the spring sealing nozzle further includes a gasket 70 disposed between the positioning block 80 and the spring 60, and the gasket 70 is used as a transition element, and the inner ring is in snap-fit connection with two ends of the positioning block 80, so that the uniformity of the stress of the spring 60 is improved. Specifically, as shown in fig. 15, at least one clamping groove 71 is formed in the inner ring of the spacer 70, at least one clamping block 81 is formed in the front side wall of the outer ring of the positioning block 80, the clamping block 81 of the positioning block 80 is correspondingly clamped in the clamping groove 71 of the spacer 70, when the positioning block 80 is inserted into the square through hole 54, the positioning block 80 can be buckled by the spacer 70, and the two clamping grooves 71 in the inner ring are designed to facilitate clamping of the positioning block 80 so that the positioning block 80 cannot move up and down, thereby preventing the spacer 70 from sliding or separating from the positioning block 80 in the production process, and improving the stability of the positioning block 80 moving back and forth in the square through hole 54.

In some of these embodiments, the spring 60 has an outer diameter of 10-250mm, a wire diameter of 2-20mm, and a length of 20-300 mm. Preferably, the outer diameter of the spring 60 is 20-200mm, the wire diameter is 3-18mm, and the length is 50-260 mm. More preferably, the outer diameter of the spring 60 is 40-180mm, the wire diameter is 5-15mm, and the length is 60-220 mm. More preferably, the outer diameter of the spring 60 is 60-120mm, the wire diameter is 8-12mm, and the length is 100-160 mm.

In some embodiments, the spring sealing compound nozzle has an overall length of 50-500mm and an outer diameter of 25-250 mm. Preferably, the overall length is 60-450mm and the outer diameter is 35-220 mm. More preferably, the overall length is 80-400mm and the outer diameter is 40-200 mm. More preferably, the overall length is 100-350mm and the outer diameter is 60-160 mm.

In some of these embodiments, as shown in fig. 1, 2, 3 and 4, the sub-nozzle 10, the middle nozzle 20 and the flange connector 30 are connected by a screw assembly. Specifically, the rear end of the sub-nozzle 10 is in threaded assembly connection with the inner hole at the front end of the middle nozzle 20. The outer part of the rear end of the middle nozzle 20 is in threaded assembly connection with the assembly cavity 31 at the front end of the flange connecting body 30, and the inner hole at the rear end is open corresponding to the matching position of the rear end of the valve needle 40 so as to be matched with the matching section with the diameter gradually increased at the rear end of the valve needle 40 to form a flow channel for injection.

In some of these embodiments, as shown in fig. 2 and 3, the valve sleeve 50 is tightly and limitedly fitted into the fitting chamber 31 by screwing the intermediate nozzle 20 and the flange connection body 30, the front end of the valve sleeve 50 is in sealing abutment with the intermediate nozzle 20, and the rear end of the valve sleeve 50 is in sealing abutment with the rear end wall of the fitting chamber 31. When the positioning block 80 moves back and forth in the square through hole 54 under the pushing-down of the valve needle 40 or under the resilience of the spring 60, the valve sleeve 50 remains stationary, and plastic fluid is prevented from entering the gaps at the two ends of the valve sleeve 50.

In one embodiment, the needle-type temperature sensing wire holes are arranged on the middle injector 20 and the flange connector 30, and the heating ring and the needle-type temperature sensing wire are arranged outside the whole injector, so that the temperature can be adjusted and corrected in a control computer, and the plastic is not easy to deteriorate and decompose under the condition of better fusion.

In one embodiment, all flow channels on the middle spring sealing glue nozzle, which are in contact with plastic fluid, need to be processed by processes such as finish polishing or electroplating or TD coating, so that the plastic is prevented from being stuck in the flow channels.

As shown in fig. 1, fig. 2 and fig. 3, the operation of the spring sealing nozzle is as follows:

before injection molding is started, the injection table of the injection molding machine advances, the R spherical surface at the front end of the sub injection nozzle 10 is in contact with and pressed against the R spherical surface of the glue inlet of the mold, and melted plastics are forced to flow into the large-hole assembly cavity 31 of the flange connector 30 under the pushing of the screw and simultaneously flow into the plurality of injection flow channels 53 on the outer ring of the valve sleeve 50; the valve sleeve 50 branches the plastic fluid into multiple paths to reach the foremost ends of the inner holes of the middle nozzle 20 and the sub-nozzles 10;

at the moment, the plastic fluid is forced to move back the valve needle 40 under the action of the continuous forward injection of the screw, the valve needle 40 can prop against the positioning block 60 when moving back, and simultaneously pushes the gasket 70 pressing the positioning block 80, and the gasket 70 pushes the spring 60 arranged on the outer diameter of the valve sleeve 50, so that the spring 60 is compressed again to generate pressure; after the plastic injection is finished, under the action of the resilience force of the spring 60, the head of the valve needle 40 is pressed against the inclined plane of the inner hole of the sub-nozzle 10 through the positioning block 60, the sealing is finished, and the channel between the flow channel and the mold is completely blocked.

The embodiments of the present invention have been described in detail, but the embodiments are merely examples, and the present invention is not limited to the embodiments described above. Any equivalent modifications and substitutions to those skilled in the art are also within the scope of the present invention. Accordingly, equivalent changes and modifications made without departing from the spirit and scope of the present invention should be covered by the present invention.