CN217944117U - Hot runner impeller injection mold - Google Patents

Abstract

The utility model relates to a hot runner impeller injection mold, which comprises a forming mold, an injection molding device and an ejection device, wherein the impeller comprises an upper cover plate, a lower cover plate and a plurality of blades connected between the upper cover plate and the lower cover plate, a shaft hole is formed at the center, and the outer diameter of the lower cover plate is smaller than that of the upper cover plate; the forming die comprises a male die and a female die, and is provided with an insert pin for forming a central shaft hole of the impeller, and an impeller die cavity matched with the impeller in shape is formed between the male die and the female die in a die closing state; the injection molding device comprises a needle valve type hot runner system, a discharging hot nozzle of the injection molding device extends into a cavity of the impeller, and a pouring gate is arranged opposite to the insert needle and is matched with the discharging hot nozzle to form a plurality of lateral discharging channels. The utility model utilizes the impeller mold cavity with special structure, the closed impeller can be molded by one-time injection molding, the production process is simplified, and the production cost of the closed impeller is reduced; the method has the advantages of no stub bar waste, no obvious joint line of products, no redundant stub bar on the surface, no post-processing, high strength of the formed impeller, high positioning precision of the die and capability of improving the product quality.

Description

Hot runner impeller injection mold

Technical Field

The utility model relates to an injection mold field, especially a hot runner impeller injection mold.

Background

A closed impeller for air pump all is equipped with the apron in impeller blade both sides, aerifys efficiently, but manufacturing process is complicated, and is with high costs, needs the ultrasonic welding upper cover, can't be through the one shot injection moulding of prior art's mould.

In addition, in the prior art, the impeller injection molding has the following defects:

1) The cold runner injection mold is adopted, multi-point feeding is carried out, the formed impeller has an obvious joint line, the strength of the impeller is affected, and scrap heads are generated due to cooling of materials in a runner, so that unnecessary waste is caused;

2) The open type hot runner injection mold is adopted, the phenomena of wire drawing and leakage are easy to occur, the surface quality of a formed impeller is poor, and post-processing is needed for surface treatment.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims at overcoming the defects of the prior art, and provides a hot runner impeller injection mold which can be used for injection molding of a closed impeller at one time by utilizing an impeller mold cavity with a special structure, thereby simplifying the production process and reducing the production cost of the closed impeller; no stub bar waste is generated, products have no obvious joint line, no redundant stub bars exist on the surfaces, post-processing is omitted, and the strength of the formed impeller is high.

The utility model adopts the following technical scheme:

a hot runner impeller injection mold comprising:

the forming die comprises a male die and a female die, the male die comprises a male template and a male die core embedded on the male template, and the female die comprises a female template and a female die core embedded on the female template; the impeller comprises an upper cover plate, a lower cover plate and a plurality of blades connected between the upper cover plate and the lower cover plate, a shaft hole is formed in the center of the impeller, and the outer diameter of the lower cover plate is smaller than that of the upper cover plate; the core insert comprises an insert pin for forming a central shaft hole of the impeller, and the cavity insert is provided with at least one cavity matched with the core of the core insert; in a die assembly state, at least one impeller die cavity matched with the impeller in shape is formed between the male die core and the female die core;

the injection molding device comprises a needle valve type hot runner system, wherein the needle valve type hot runner system is provided with at least one discharging hot nozzle, a discharging flow channel is formed in the center of the discharging hot nozzle, a pouring gate is formed at the tail end of the discharging hot nozzle, the discharging hot nozzle penetrates through a cavity insert and extends into an impeller mold cavity and is in sealing connection with the cavity insert, and a discharging sleeve is arranged at the tail end of the discharging hot nozzle around the pouring gate; the insert pin and the pouring gate are arranged oppositely, and a plurality of lateral discharging channels are formed among the insert pin, the pouring gate and the discharging sleeve;

and the ejection device is used for demolding the impeller.

Furthermore, the discharging sleeve comprises a plurality of discharging stop blocks which are uniformly arranged along the circumferential direction of the pouring gate at equal intervals, and the discharging channel is formed between every two adjacent discharging stop blocks.

Furthermore, a plurality of impeller cavities matched with the impeller in shape are formed between the male die core and the female die core.

Further, needle valve formula hot runner system includes hot mouth of main heat, flow distribution plate, the hot mouth of a plurality of ejection of compact, and main heat mouth center forms the sprue, is formed with a plurality of subchannels that are linked together with the sprue in the flow distribution plate, and each subchannel communicates with ejection of compact runner one-to-one, and every ejection of compact runner corresponds respectively and is provided with the needle and is used for connecting and drive the cylinder of needle reciprocating motion, and the opening and closing of the corresponding runner of needle reciprocating motion control.

Furthermore, the shunt channels are integrally formed in the shunt plate, or shunt pipelines are distributed in the shunt plate, and the shunt pipelines form the shunt channels at the centers.

Furthermore, heating devices are arranged in the main hot nozzle, the flow distribution plate and the discharging hot nozzle.

Furthermore, the ejector device comprises an ejector plate, an ejector pin fixedly installed on the ejector plate and a driving device, the ejector plate is arranged in a guiding and moving mode relative to the male template, the ejector pin is sleeved outside the insert pin and penetrates through the male template and the male mold core, and the driving device is used for driving the ejector plate to move in a reciprocating mode so as to drive the ejector pin to move to eject the impeller out of the male mold core.

Furthermore, the ejector plate is movably arranged through the guide of the first guide column and the guide hole in a matched mode relative to the male template, and the first guide column is further sleeved with a return spring.

Further, the hot runner impeller injection mold further comprises a panel, a bottom plate and a heat flow plate; the flow distribution plate is arranged on the heat flow plate, the heat flow plate is arranged between the panel and the mother template, and the heat flow plate and the mother template are connected to the panel in a guiding and moving manner; the ejector plate is arranged between the male template and the bottom plate, a supporting foot pad is further arranged between the male template and the bottom plate and used for providing a moving space for the ejector plate, and the male template and the ejector plate are connected to the bottom plate in a guiding and moving mode; the female template and the male template are arranged in a relatively guiding and moving mode.

Furthermore, the insert pin is fixed on the bottom plate and penetrates through the ejector plate, the male template and the male die core to extend into the impeller die cavity.

It can be known from the above description of the present invention, compared with the prior art, the beneficial effects of the present invention are:

first, the utility model discloses a hot runner impeller injection mold utilizes the impeller die cavity of special construction, and the apron external diameter is less than the upper cover plate external diameter under the design, but one shot injection moulding closed impeller, simplifies production technology, reduces the manufacturing cost of closed impeller.

Secondly, the molding of the central shaft hole of the impeller can be realized through the insert pin arranged opposite to the pouring gate; through setting up the ejection of compact cover around the runner, form the discharging channel of a plurality of laterals, make the plastic flow from the side direction, do not influence the shaping in impeller center shaft hole, the feeding is smooth, design benefit.

Thirdly, a needle valve type hot runner system is adopted, no stub bar waste is generated in the injection molding runner, and resource waste can be avoided; after filling, the valve needle is controlled to automatically close the pouring gate, no excess stub bar is arranged on the surface of the forming impeller, and post-processing can be omitted; adopt the hot runner, the temperature is high when the plastic pours into the impeller die cavity into, and joint line department combines better, can avoid because of the joint line that the plastic cooling leads to, reduces the influence to impeller intensity, improves product quality.

Fourthly, all parts of the die are matched with the guide holes through the guide columns and are guided to move and installed, the positioning precision is high, and the improvement of the product quality is facilitated.

Drawings

Fig. 1 is an overall structure front view of a hot runner impeller injection mold according to embodiment 1 of the present invention;

fig. 2 is an exploded schematic view of a hot runner impeller injection mold according to embodiment 1 of the present invention;

fig. 3 is a perspective view of a part of the structure of a hot runner impeller injection mold according to embodiment 1 of the present invention, in which a splitter plate structure is shown;

fig. 4 is a perspective view of a part of a hot runner impeller injection mold according to embodiment 1 of the present invention, in which a core insert, a cavity insert and a guide structure are shown;

fig. 5 is a perspective view of a part of the structure of the hot runner impeller injection mold according to embodiment 1 of the present invention, showing the structure of the injection molding apparatus and the structure of the discharge hot nozzle matching with the core insert;

fig. 6 is a perspective view of a part of the structure of an injection molding apparatus according to embodiment 1 of the present invention;

fig. 7 is a partial structural sectional view of the hot runner impeller injection mold according to embodiment 1 of the present invention;

fig. 8 is a perspective view of the cavity insert of embodiment 1 of the present invention;

fig. 9 is a perspective view of the core insert according to embodiment 1 of the present invention;

fig. 10 is a perspective view of the matching structure of the hot discharge nozzle and the insert pin according to embodiment 1 of the present invention;

fig. 11 is a perspective view of an impeller according to embodiment 1 of the present invention at a first viewing angle;

fig. 12 is a perspective view of the impeller of embodiment 1 of the present invention at a second viewing angle;

FIG. 13 is a sectional view of a connecting structure of a main hot nozzle and a glue pouring port in embodiment 1 of the present invention;

fig. 14 is a sectional view of a hot discharge nozzle according to embodiment 1 of the present invention.

In the figure: 1. a face plate, 2, a bottom plate, 3, a male template, 4, a male die core, 41, a die core, 411, an insert pin, 5, a female template, 6, a female die core, 61, a die cavity, 7, an impeller, 71, an upper cover plate, 72, a lower cover plate, 73, a blade, 74, a shaft hole, 8, a main heat nozzle, 9, a splitter plate, 10, a heat flow plate, 11, a discharge heat nozzle, 12, a main runner, 13, a splitter channel, 14, a discharge runner, 15, a sprue, 16, a valve needle, 17, an air cylinder, 18, a discharge stop block, 19, a discharge channel, 20, a heating wire, 21, an upper ejection plate, 22, a lower ejection plate, 23, an ejector pin, 24, a support foot pad, 25, a first guide column, 26, a return spring, 27, a glue filling opening, 28, a second guide column, 29, a guide sleeve, 30, a third guide column and 31, and a support guide column.

Detailed Description

The present invention will be further described with reference to the following detailed description.

Example 1

Referring to fig. 1 to 14, the utility model discloses a hot runner impeller injection mold includes panel 1, bottom plate 2, forming die, injection molding device and ejecting device.

The forming die comprises a male die and a female die, wherein the male die comprises a male template 3 and a male die core 4 embedded on the male template 3, and the female die comprises a female template 5 and a female die core 6 embedded on the female template 5. The impeller 7 includes an upper cover plate 71, a lower cover plate 72, and a plurality of blades 73 connected between the upper cover plate 71 and the lower cover plate 72, a shaft hole 74 is formed in the center of the impeller 7, and the outer diameter of the lower cover plate 72 is smaller than that of the upper cover plate 71. The core insert 4 is provided with four mold cores 41, the mold core 41 comprises an insert pin 411 for forming the central shaft hole 74 of the impeller, and the cavity insert 6 is provided with four mold cavities 61 matched with the mold core 41 of the core insert 4; and under the die assembly state, four impeller die cavities matched with the impeller 7 in shape are formed between the male die core 4 and the female die core 6.

The injection molding device comprises a needle valve type hot runner system, wherein the needle valve type hot runner system comprises a main hot nozzle 8, a flow distribution plate 9, a hot flow plate 10 and four discharging hot nozzles 11. The center of the main hot nozzle 8 forms a main runner 12, four sub-runners 13 communicated with the main runner 12 are formed in the sub-runner plate 9, a discharge runner 14 is formed at the center of the discharge hot nozzle 11, a sprue 15 is formed at the tail end of the discharge hot nozzle 11, the sub-runners 13 are communicated with the discharge runners 14 in a one-to-one correspondence manner, and the discharge runners 14 are arranged in a one-to-one correspondence manner with the impeller mold cavities. Each discharging flow channel 14 is correspondingly provided with a valve needle 16 and a cylinder 17 for connecting and driving the valve needle 16 to reciprocate, and the reciprocating motion of the valve needle 16 controls the opening and closing of the corresponding gate 15. Hot mouth 11 of ejection of compact runs through cavity 6 and stretches into the impeller die cavity and with cavity 6 sealing connection, and the end of hot mouth of ejection of compact 11 is provided with the ejection of compact cover around runner 15, the ejection of compact cover includes follows the equal three ejection of compact dog 18 that sets up of interval such as runner 15 circumference, inlay needle 411 and runner 15 and set up relatively, form three lateral discharging channel 19 between inlaying needle 411, runner 15 and the ejection of compact cover. The flow distribution plate 9 is installed on the heat flow plate 10, the heat flow plate 10 is arranged between the panel 1 and the mother template 5, flow distribution pipelines are distributed in the flow distribution plate 9, and the center of each flow distribution pipeline forms the flow distribution channel 13. Heating wires 20 are arranged in the main hot nozzle 8, the flow distribution plate 9 and the discharging hot nozzle 11 and used for heating plastic in the flow channel.

The ejection device is used for demolding the impeller and comprises an upper ejection plate 21, a lower ejection plate 22, four ejector pins 23 and a driving device, wherein the four ejector pins 23 correspond to the four impeller mold cavities one by one. The bottom of the upper ejector plate 21 is provided with a counter bore, and the ejector pins 23 penetrate through the upper ejector plate 21 and are clamped in the corresponding counter bore positions and are tightly pressed and fixed by the lower ejector plate 22. The upper ejector plate 21 and the lower ejector plate 22 are disposed between the core plate 3 and the bottom plate 2, and are guided to move relative to the core plate 3 and the bottom plate 2. The thimble 23 is sleeved outside the insert 411, passes through the core plate 3 and the core insert 4, and is disposed corresponding to the central cylinder of the impeller 7. The driving device is used for driving the lower ejector plate 22 to reciprocate so as to drive the ejector pin 23 to move and eject the impeller 7 out of the core insert 4. Still be provided with two support callus on the sole 24 between formboard 3 and bottom plate 2, the symmetry sets up in last ejector plate 21, lower ejector plate 22 both sides for last ejector plate 21, lower ejector plate 22 provide the space of removing, support callus on the sole 24 fixed connection on bottom plate 2. The upper ejector plate 21 and the lower ejector plate 22 are arranged in a guiding movement mode relative to the male template 3 through the matching of the first guide column 25 and the guide hole, and the first guide column 25 is further sleeved with a return spring 26.

The panel 1 is provided with a glue filling port 27, and the glue filling port 27 is communicated with the main runner 12. The panel 1, the heat flow plate 10, the female template 5 and the male template 3 are matched with the guide sleeve 29 through four second guide pillars 28 which sequentially penetrate through the panel 1, the heat flow plate 10, the female template 5 and the male template 3 to realize mutual guiding and positioning. The supporting foot pads 24 are provided with third guide pillars 30, and the male die plate 3 is arranged in a guiding and moving mode relative to the bottom plate 2 through the matching of the guide holes and the third guide pillars 30. Still be connected with support guide pillar 31 on the bottom plate 2, support guide pillar 31 runs through ejector plate 21, ejector plate 22 setting down to with ejector plate 21, ejector plate 22 direction removal cooperation down, support guide pillar 31 still has the effect of supporting public template 3, supports and sets up in public template 3 below, can avoid long-term production to lead to public template 3 to warp. The insert pin 411 is fixed on the bottom plate 2 and penetrates through the lower ejector plate 22, the upper ejector plate 21, the male die plate 3 and the male die core 4 to extend into the cavity of the impeller.

Referring to fig. 1 to 14, the working principle of the hot runner impeller injection mold of the present invention is: and connecting the injection molding machine, and controlling the mold closing and mold separation of the mold through a mold closing mechanism. In the state that the male mold and the female mold are closed, plastic flows into the main runner 12 from a glue filling port 27 above the panel 1, flows into the four discharge runners 14 after being divided by the branch runners 13, and then flows into an impeller mold cavity from the sprue 15; after the filling is completed, the air cylinder 17 drives the valve needle 16 to move downwards to close the gate 15; heating the plastic in the runner by a heating wire 20 during injection molding; after the impeller is molded, the male mold and the female mold are controlled to be separated, the lower ejector plate 22 is driven by the driving device to move upwards to drive the ejector pin 23 to move upwards so as to eject the impeller 7 out of the male mold core 4, and then the impeller demolding is completed.

Example 2

This example differs from example 1 in that: the male die core 4 is provided with three die cores 41, and the female die core 6 is provided with three die cavities 61; and in the die assembly state, three impeller die cavities matched with the impeller 7 in shape are formed between the male die core 4 and the female die core 6. The needle valve type hot runner comprises a main runner 12, three branch runners 13 communicated with the main runner 12, three discharge runners 14 correspondingly communicated with the three branch runners 13, three valve needles 16 arranged in one-to-one correspondence with the three discharge runners 14, and three cylinders 17 respectively used for connecting and driving the three valve needles 16 to reciprocate. The shunting plate 9 is internally and integrally formed with the shunting passage 13.

The aforesaid is only two concrete implementation manners of the utility model, nevertheless the utility model discloses a design concept is not limited to this, and all utilize this design right the utility model discloses carry out immaterial change, all should belong to and infringe the action of the scope of protection of the utility model.

Claims (10)

1. A hot runner impeller injection mold, comprising:

the forming die comprises a male die and a female die, the male die comprises a male template and a male die core embedded on the male template, and the female die comprises a female template and a female die core embedded on the female template; the impeller comprises an upper cover plate, a lower cover plate and a plurality of blades connected between the upper cover plate and the lower cover plate, a shaft hole is formed in the center of the impeller, and the outer diameter of the lower cover plate is smaller than that of the upper cover plate; the core insert is provided with at least one mold core, the mold core comprises an insert pin for forming a central shaft hole of the impeller, and the cavity insert is provided with at least one mold cavity matched with the mold core of the core insert; in a die assembly state, at least one impeller die cavity matched with the impeller in shape is formed between the male die core and the female die core;

the injection molding device comprises a needle valve type hot runner system, wherein the needle valve type hot runner system is provided with at least one discharging hot nozzle, a discharging flow channel is formed in the center of the discharging hot nozzle, a pouring gate is formed at the tail end of the discharging hot nozzle, the discharging hot nozzle penetrates through a cavity insert and extends into an impeller mold cavity and is in sealing connection with the cavity insert, and a discharging sleeve is arranged at the tail end of the discharging hot nozzle around the pouring gate; the insert pin and the sprue are arranged oppositely, and a plurality of lateral discharge channels are formed among the insert pin, the sprue and the discharge sleeve;

and the ejection device is used for demolding the impeller.

2. The hot runner impeller injection mold of claim 1, wherein the sprue bushing includes a plurality of evenly spaced discharge stops circumferentially spaced around the sprue, adjacent ones of the discharge stops defining the discharge channel therebetween.

3. The hot runner impeller injection mold according to claim 1 or 2, wherein a plurality of impeller cavities matching the shape of the impeller are formed between the core insert and the cavity insert.

4. The hot runner impeller injection mold according to claim 3, wherein the needle valve type hot runner system comprises a main hot nozzle, a splitter plate, and a plurality of discharging hot nozzles, wherein a main runner is formed in the center of the main hot nozzle, a plurality of splitter channels communicated with the main runner are formed in the splitter plate, the splitter channels are communicated with the discharging runners in a one-to-one correspondence manner, each discharging runner is correspondingly provided with a valve needle and an air cylinder for connecting and driving the valve needle to reciprocate, and the valve needle reciprocates to control the opening and closing of the corresponding gate.

5. The hot runner impeller injection mold as claimed in claim 4, wherein the runners are integrally formed in the manifold, or wherein runners are provided in the manifold with their centers forming the runners.

6. The hot runner impeller injection mold of claim 4, wherein heating means are provided in the main hot nozzle, the manifold and the discharge hot nozzle.

7. The hot runner impeller injection mold according to claim 4, wherein the ejector device comprises an ejector plate, an ejector pin fixedly installed on the ejector plate, and a driving device, the ejector plate is movably guided relative to the male mold plate, the ejector pin is sleeved outside the insert pin and penetrates through the male mold plate and the male mold insert, and the driving device is used for driving the ejector plate to reciprocate so as to drive the ejector pin to move to eject the impeller out of the male mold insert.

8. The hot runner impeller injection mold of claim 7, wherein the ejector plate is movably guided with respect to the male mold plate by a first guide post engaged with the guide hole, the first guide post further being fitted with a return spring.

9. The hot runner impeller injection mold of claim 7, further comprising a face plate, a bottom plate, and a heat flow plate; the flow distribution plate is arranged on the heat flow plate, the heat flow plate is arranged between the panel and the mother template, and the heat flow plate and the mother template are connected to the panel in a guiding and moving manner; the ejector plate is arranged between the male template and the bottom plate, a supporting foot pad is further arranged between the male template and the bottom plate and used for providing a moving space for the ejector plate, and the male template and the ejector plate are connected to the bottom plate in a guiding and moving mode; the female template and the male template are arranged in a relatively guiding and moving mode.

10. The hot runner impeller injection mold of claim 9, wherein the insert pin is fixed to the base plate and extends through the ejector plate, the core plate, and the core insert into the impeller cavity.

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