CN115230082B

CN115230082B - Motor mould for preventing injection molding channel from being blocked

Info

Publication number: CN115230082B
Application number: CN202210742973.7A
Authority: CN
Inventors: 倪佳倩; 陈家浩; 郑青锋; 陈明
Original assignee: Shaoxing Shangyu Zhenxiang Precision Mould Co ltd
Current assignee: Shaoxing Shangyu Zhenxiang Precision Mould Co ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2023-03-21
Anticipated expiration: 2042-06-28
Also published as: CN115230082A

Abstract

The invention discloses a motor mold for preventing an injection molding channel from being blocked, which comprises an upper mold and a lower mold, wherein the upper mold and the lower mold are assembled to form a cavity, a mold core is arranged in the cavity, the mold core comprises at least one movable mold core part, a primary injection molding channel and a secondary injection molding channel are arranged on the upper mold, a plurality of exhaust channels are arranged on the lower mold, check valves are arranged in the exhaust channels, the primary injection molding channel and the secondary injection molding channel are respectively connected with a first material return channel and a second material return channel, the first material return channel and the second material return channel are respectively provided with a check valve, a heat-insulation material storage barrel comprises a first material storage cavity and a second material storage cavity, electric heating wires are arranged on the peripheries of the first material storage cavity and the second material storage cavity, the primary injection molding channel and a first injection molding machine are connected with two sides of the first material storage cavity, the second material storage cavity is connected with a secondary injection molding channel and a second injection molding machine, and an automatic material return mechanism is arranged on the heat-insulation material storage barrel. The motor mould can prevent the primary injection channel and the secondary injection channel from being blocked due to solidification of materials.

Description

Motor mould for preventing injection molding channel from being blocked

Technical Field

The invention belongs to the technical field of injection molds, particularly relates to the technical field of secondary injection molds, and particularly relates to a motor mold for preventing an injection molding channel from being blocked.

Background

Existing electric machines typically include a permanent magnet rotor and stator windings, with the stator winding portion including stator poles formed by coils surrounding a stator core. The stator winding part of some motors adopts an integrally injection-molded stator support to install a stator core, and the stator support is formed by injection molding of hard plastics, so that the stator winding part can not be accurately fixed on the stator support due to the deviation of the size of the core caused by production errors. In order to avoid the situation that size deviation leads to being difficult to fix, a stator support is designed, and the stator support comprises a support body, wherein a plastic elastomer is injected on the side wall of the position of the iron core fixed in the support body, and an air gap between the stator support and the iron core can be reduced through the support and deformation of the plastic elastomer.

The traditional secondary injection molding mode generally needs to carry out secondary injection molding through two molds to carry out processing, so that the processing efficiency is lower and the processing cost is higher. The applicant is for improving secondary injection molding efficiency, realizes processing the mode of carrying out secondary injection molding in a pair mould, but because the mould of secondary injection molding all will stay a period of time when two kinds of materials are moulded plastics and mould plastics again, leads to once to mould plastics the material cooling hardening in passageway and the secondary channel of moulding plastics and plugs up once and mould plastics the passageway with the secondary easily.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the motor mold for preventing the injection molding channel from being blocked, the motor mold is provided with the heat-preservation storage barrel, the internal material can be automatically sucked into the heat-preservation storage barrel for heat preservation by arranging the automatic material return mechanism before the material in the primary injection molding channel and the material in the secondary injection molding channel are cooled and solidified, and the blockage of the primary injection molding channel and the secondary injection molding channel due to the solidification of the material is prevented.

In order to solve the technical problem, the invention is solved by the following technical scheme: the utility model provides a prevent motor mold that passageway blockked up of moulding plastics, includes mould and lower mould, it forms the die cavity to go up mould and lower mould compound die, be provided with the core in the die cavity, the core includes at least one activity die core portion, it moulds plastics the passageway once and twice to be provided with on the mould, be provided with a plurality of exhaust passage on the lower mould, be provided with the check valve that only the direction of giving vent to anger can circulate in the exhaust passage, once mould plastics the passageway with the twice is moulded plastics the passageway and is connected with first feed back passageway and second feed back passageway respectively, first feed back passageway with the second feed back passageway all is provided with the check valve that only the direction of admitting air can circulate, once mould plastics the passageway with the twice is moulded plastics the passageway and is connected with the heat preservation storage vat, the heat preservation storage vat includes first storage cavity and second storage cavity, first storage cavity with second storage cavity periphery is provided with the heating wire, once mould plastics passageway and first injection molding machine in first cavity both sides, the second storage cavity is connected with the twice and is moulded plastics the passageway and second injection machine, be provided with automatic feed back mechanism on the heat preservation storage vat. Through setting up automatic feed back mechanism can once mould plastics the passageway and the material cooling solidification in the passageway is moulded plastics to the secondary before, heat preservation in inhaling the heat preservation storage vat with inside material automatically, prevent once mould plastics the passageway and the secondary passageway of moulding plastics because of the material solidifies and block up.

Among the above-mentioned technical scheme, it is preferred, automatic feed back mechanism including set up in first piston in the first storage chamber set up in the second piston in the second storage chamber, the connecting rod of first piston is worn out from the top first storage chamber the connecting rod of second piston is worn out from the bottom the second storage chamber, the connecting rod of first piston with the connecting rod of second piston passes through lifting support fixed connection, lifting support is gone up and down by drive arrangement drive, second storage chamber top both sides are connected secondary and are moulded plastics passageway and second injection molding machine. Through the structure, when the driving device drives the lifting support to ascend, the first piston is driven to ascend, residual materials in the primary injection molding channel can be sucked into the first material storage cavity for heat preservation, and the second piston simultaneously ascends to discharge materials sucked from the secondary injection molding channel in the second material storage cavity at the last time into the secondary injection molding channel; the first piston is driven to descend in the descending process of the lifting support, the material sucked into the first material storage cavity last time is extruded into the first injection molding channel, the second piston descends simultaneously, and the material sucked into the second material storage cavity in the second injection molding channel is insulated. Therefore, the retention time of the materials in the primary injection molding channel and the secondary injection molding channel is reduced, and the blockage of the primary injection molding channel and the secondary injection molding channel due to long feeding stopping time is prevented.

In the above technical solution, preferably, elastic buffer mechanisms are disposed between the first piston and the connecting rod thereof and between the second piston and the connecting rod thereof.

Among the above-mentioned technical scheme, it is preferred, automatic feed back mechanism including set up in the first piston chamber of first storage cavity side and intercommunication, set up in the second piston chamber of second storage cavity side and intercommunication, first piston chamber with the second piston intracavity all is provided with the third piston, the lower mould embeds has two third piston chambers, the equal slip of third piston intracavity is provided with the fourth piston, two the connecting rod of third piston connects one respectively the fourth piston, be provided with expend with heat and contract with cold medium in the third piston intracavity, works as when expend with heat and contract with cold medium cooling, the third piston removes will once mould plastics the passageway with the material in the passageway of twice moulding plastics is inhaled in the heat preservation storage vat. By adopting the structure, when the lower die is cooled, the expansion and contraction medium in the third piston is cooled, the fourth piston can be driven to move, the fourth piston drives the third piston to move, the injection molding channel is injected once, and the material in the injection molding channel is sucked into the heat-insulation storage barrel, so that the blockage of the injection molding channel and the injection molding channel due to the long feeding stop time is prevented.

In the above technical solution, preferably, the lower mold is provided with a cooling water channel around the mold cavity. Adopt this structure can let in the cooling water cooling when filling in the die cavity at every turn, improve the efficiency of moulding plastics.

In the above technical solution, preferably, the upper die and the lower die are provided with aligned guide holes, and guide posts are arranged in the guide holes. By adopting the structure, the upper die can be accurately positioned when the opening and closing die moves.

Compared with the prior art, the invention has the following beneficial effects: through setting up automatic feed back mechanism can once mould plastics the passageway and the secondary mould plastics the material cooling in the passageway before solidifying, keep warm in inhaling the heat preservation storage vat with inside material automatically, prevent once mould plastics the passageway and the secondary channel of moulding plastics because of the material solidifies and block up.

Drawings

Fig. 1 is a schematic structural view of the embodiment of the invention except for the mold clamping state of the automatic feed back mechanism.

Fig. 2 is a schematic structural diagram of a mold clamping state of a complete structure according to an embodiment of the present invention.

Fig. 3 is a schematic structural view of an upper die in an embodiment of the present invention.

Fig. 4 is a schematic view showing a structure in which the first movable core portion and the third movable core portion are engaged in the embodiment of the present invention.

Fig. 5 is a schematic structural view of a second movable core part according to an embodiment of the present invention.

FIG. 6 is a cross-sectional view of the support ring lowered to the bottom in an embodiment of the present invention.

FIG. 7 is a schematic cross-sectional view of a support ring raised to the top in an embodiment of the present invention.

Fig. 8 is a partial sectional view schematically showing the engagement of the third movable core portion with the upper die in the embodiment of the present invention.

FIG. 9 is a schematic cross-sectional view of the thermal insulation storage vat in a one-shot injection molding state according to the embodiment of the invention.

FIG. 10 is a schematic cross-sectional view of the thermal storage vat in a secondary injection molding state according to an embodiment of the invention.

Fig. 11 is a schematic structural diagram of the stator frame body when one-time injection molding is completed in the embodiment of the invention.

Fig. 12 is a schematic structural diagram of the whole stator bracket when one-time injection molding is completed in the embodiment of the invention.

FIG. 13 is another embodiment of the lower die connecting automatic feed back mechanism in the embodiment of the present invention.

FIG. 14 is a cross-sectional structural view of the first piston cavity position in the high temperature state of the automatic feed back mechanism of FIG. 13.

Fig. 15 is a schematic cross-sectional structural view of the second piston chamber of the automatic feed back mechanism of fig. 13 in a low temperature state.

Detailed Description

The invention is described in further detail below with reference to the following detailed description and accompanying drawings: referring to fig. 1 to 15, a motor mold for preventing blocking of an injection molding channel, comprising an upper mold 1 and a lower mold 2, wherein the upper mold 1 and the lower mold 2 are assembled to form a cavity, a core 3 is arranged in the cavity, the core 3 comprises at least one movable core part, a primary injection molding channel 22 and a secondary injection molding channel 23 are arranged on the upper mold 1 and the lower mold 2, a plurality of exhaust channels are arranged on the lower mold 2, check valves which only give vent in a circulating direction are arranged in the exhaust channels, the primary injection molding channel 22 and the secondary injection molding channel 23 are respectively connected with a first material return channel 24 and a second material return channel 25, the first material return channel 24 and the second material return channel 25 are both provided with check valves which only give vent in a circulating direction, the primary injection molding channel 22 and the secondary injection molding channel 23 are connected with a heat preservation storage vat 5, the heat preservation storage vat 5 comprises a first storage cavity 51 and a second storage cavity 52, electric heating wires 53 are arranged on the peripheries of the first storage cavity 51 and the second storage cavity 52, the first storage cavity 51 and the second storage vat 5 are connected with a secondary injection molding machine, and an automatic material return mechanism 6 is arranged on the second storage vat 5. Through setting up automatic feed back mechanism can be once moulding plastics passageway 22 and the material cooling solidification in the passageway 23 of moulding plastics of secondary before, automatic with inside material suction heat preservation storage vat 5 in keep warm, prevent that passageway 22 of once moulding plastics and the passageway 23 of moulding plastics of secondary from blockking up because of the material solidifies.

Referring to fig. 7 and 8, the automatic material returning mechanism 6 includes a first piston 54 disposed in the first material storage chamber 51 and a second piston 55 disposed in the second material storage chamber 52, a connecting rod of the first piston 54 penetrates through the first material storage chamber 51 from the top, a connecting rod of the second piston 55 penetrates through the second material storage chamber 52 from the bottom, the connecting rod of the first piston 54 and the connecting rod of the second piston 55 are fixedly connected through a lifting bracket 56, the lifting bracket 56 is driven by the driving device 4 to lift, and the two sides of the top of the second material storage chamber 52 are connected with the secondary injection molding channel 23 and the second injection molding machine. Through the structure, when the lifting bracket 56 is driven by the driving device 4 to ascend, the first piston 54 is driven to ascend, the residual material in the primary injection channel 22 can be sucked into the first storage cavity 51 for heat preservation, and the second piston 55 ascends simultaneously to discharge the material sucked from the secondary injection channel 23 last time in the second storage cavity 52 into the secondary injection channel 23; in the same process that the lifting bracket 56 descends, the first piston 54 is driven to descend, the material sucked into the first storage cavity 51 last time is extruded into the primary injection channel 22, and the second piston 55 descends simultaneously, and the material sucked into the secondary injection channel 23 is sucked into the second storage cavity 52 for heat preservation. Therefore, the residence time of the materials in the primary injection channel 22 and the secondary injection channel 23 is reduced, and the blockage of the primary injection channel 22 and the secondary injection channel 23 due to long feeding stopping time is prevented.

In the present embodiment, elastic buffer mechanisms 57 are provided between the first piston 54 and its connecting rod and between the second piston 55 and its connecting rod. The buffer mechanism 57 includes a spring seat and a spring, one end of the spring is fixed on the spring seat in the first storage chamber 51, and the other end is connected to the first piston 54, and one end of the spring is fixed on the spring seat in the second storage chamber 52, and the other end is connected to the second piston 55. Of course, other known spring-damper mechanisms 57 may be used in other embodiments.

Referring to fig. 13 to 15, in another embodiment of the automatic material returning mechanism 6, the automatic material returning mechanism 6 includes a first piston chamber 58 disposed on a side surface of the first material storing chamber 51 and communicated with the first material storing chamber, and a second piston chamber 59 disposed on a side surface of the second material storing chamber 52 and communicated with the second material storing chamber, third pistons 510 are disposed in the first piston chamber 58 and the second piston chamber 59, two third piston chambers 511 are disposed in the lower mold 2, fourth pistons 512 are slidably disposed in the third piston chambers 511, connecting rods of the two third pistons 510 are respectively connected to the fourth pistons 512, expansion and contraction media are disposed in the third piston chambers 511, and when the expansion and contraction media are cooled, the third pistons 510 move to suck the materials in the primary injection molding passage 22 and the secondary injection molding passage 23 into the heat preservation material storing barrel 5. By adopting the structure, when the lower die 2 is cooled, the expansion and contraction medium in the third piston 510 is cooled, the fourth piston 512 is driven to move, the fourth piston 512 drives the third piston 510 to move, the primary injection molding channel 22 and the material in the secondary injection molding channel 23 are sucked into the heat-insulation storage barrel 5, and therefore the blockage of the primary injection molding channel and the secondary injection molding channel due to the long feeding stopping time is prevented. The expansion and contraction medium can be paraffin, gas or other medium with obvious volume change.

In this embodiment, in order to promote the efficiency of moulding plastics, accelerate the solidification rate of moulding plastics material, be provided with the cooling water passageway around die cavity 21 in lower mould 2. Adopt this structure can let in the cooling water cooling when filling in the die cavity at every turn, improve the efficiency of moulding plastics.

In this embodiment, the upper die 1 and the lower die 2 are provided with aligned guide holes 200, and guide posts are provided in the guide holes 200. By adopting the structure, the upper die 1 can be accurately positioned when the opening and closing die moves.

Specifically, in the present embodiment, taking a mold for processing a stator frame as an example, the movable core portions are arranged in such a manner that the bottom of the upper mold 1 is provided with the core 3 extending into the cavity 21, and the core 3 includes the fixed core portion 31, the first movable core portion 32, the twelve second movable core portions 33, and the twelve third movable core portions 34; the fixed core part 31 is cylindrical with the outer diameter smaller than the die cavity 21, an annular channel 100 is arranged between the fixed core part 31 and the upper die 1, twelve die grooves 311 are arranged in the fixed core part 31 from the outer diameter side to the inner side in the radial direction, and arc-shaped grooves 312 extend from the inner end of the die grooves 311 to the two sides; a driving cavity 11 is arranged in the upper die 1, a channel is arranged on the upper die 1 at the top of each die cavity 311, two baffle plates 321 attached to two sides of the die cavity 311 are movably arranged in each channel, one side of each twenty-four baffle plates 321 positioned in the driving cavity 11 is connected to a support ring 322 to form a first movable core part 32, the first movable core part 32 is driven to lift by a driving device 4, a vertical waist hole is formed in the side surface of the upper die 1, and the support ring 322 extends out of a connecting rod from the vertical waist hole to be fixedly connected with a lifting support 56, so that the lifting support 56 is driven by the driving device 4; a second movable core part 33 is arranged above the die cavity 311 of the fixed core part 31, a first return spring 331 is arranged between the second movable core part 33 and the upper die 1, the upper end of the second movable core part 33 penetrates through the driving cavity 11 and is provided with a first limit block 332, and the top of the second movable core part 33 is provided with an extension part 333 which can be lifted by the support ring 322; a third movable core part 34 is arranged above the part between the die cavities 311 of the fixed core part 31, a second return spring 341 is arranged between the third movable core part 34 and the upper die 1, gear grooves 342 are arranged on two sides of the third movable core part 34, a stop block 323 matched with the gear grooves 342 is arranged at the bottom of the baffle 321, and vertical grooves 313 for the stop block 323 to slide are arranged on two sides of the die cavities 311; when the support ring 322 is lowered to the bottom, the second and third

movable core parts

33, 34 fill the annular channel 100, the core 3 forming with the mould cavity 21 a first mould cavity for moulding the motor-holder body; when the support ring 322 is raised to the top, the second movable core portion 33 and the third movable core portion 34 are lifted by the first movable core portion 32 to communicate with the annular passage 100, and the core 3, the motor holder body, and the cavity 21 form a second cavity for molding an elastic body. When the motor stator support is machined by the motor mold, two states are provided, during one-time injection, the support ring 322 is lowered to the bottom by the driving device 4, the annular channel 100 is filled with the second movable core part 33 and the third movable core part 34, one-time injection is performed, the body of the stator support is subjected to injection molding, after the injection molding is completed and cooled and hardened, the support ring 322 is lifted to the top by the driving device 4, the second movable core part 33 and the third movable core part 34 are driven to move upwards in the lifting process, the position of the annular channel 100 is made free, the position of the body of the stator support needing the secondary injection molding of the elastomer is communicated by the annular channel 100, the injection molding of the injection molded elastomer of each part can be completed through the secondary injection channel 23, when the mold is opened and closed, the upper mold 1 is a movable mold, when the mold is released after cooling, the injection molded elastomer in the annular channel 100 can enable the injection molded motor stator support to be fixed with the upper mold 1, and due to the elasticity of the molded elastomer, the motor stator support can be easily separated from the upper mold 1, so that the demolding is convenient, the two-time injection molding of the motor stator mold can be machined, the injection molding mold can be effectively connected into a plurality of injection molding mold, and the injection molding elastomer can be conveniently connected into a plurality of injection molding mold, and the injection molding cost can be conveniently saved.

The driving device 4 is a motor 41 and is fixed in the driving cavity, the output shaft of the motor 41 is connected with a screw rod 42, the support ring 322 is provided with a nut, and the screw rod 42 is in threaded fit with the nut. The lifting of the support ring 322 is controlled by the positive and negative rotation of the motor 41, however, in other embodiments, a person skilled in the art may use other existing driving devices to realize the lifting of the support ring 322 as long as the controllable lifting can be realized.

In this embodiment, the upper mold 1 is provided with a primary injection passage 22 and a secondary injection passage 23 which communicate with the mold cavity 21.

In this embodiment, the inlet of the secondary injection channel 23 is located outside the annular channel 100, and when the support ring 322 is lowered to the bottom, the second movable core portion 33 or the third movable core portion 34 blocks the inlet of the secondary injection channel 23. With this structure, the entrance of the secondary injection passage 23 can be blocked by the second movable core part 33 or the third movable core part 34 at the time of primary injection, preventing the material of primary injection and the material of secondary injection from being mixed.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a prevent motor mold that passageway blockked up of moulding plastics, includes mould (1) and lower mould (2), it forms the die cavity to go up mould (1) and lower mould (2) compound die, be provided with core (3) in the die cavity, core (3) are including at least one activity core portion, it moulds plastics passageway (23) once to be provided with on mould (1) and mould plastics passageway (22) and secondary, be provided with a plurality of exhaust passage on lower mould (2), its characterized in that: the air exhaust channel is internally provided with a one-way valve which can only flow in the air outlet direction, the primary injection molding channel (22) and the secondary injection molding channel (23) are respectively connected with a first material return channel (24) and a second material return channel (25), the first material return channel (24) and the second material return channel (25) are respectively provided with a one-way valve which can only flow in the air inlet direction, the primary injection molding channel (22) and the secondary injection molding channel (23) are connected with a heat preservation storage barrel (5), the heat preservation storage barrel (5) comprises a first storage cavity (51) and a second storage cavity (52), the peripheries of the first storage cavity (51) and the second storage cavity (52) are provided with electric heating wires (53), two sides of the first storage cavity (51) are connected with the primary injection molding channel (22) and a first injection molding machine, the second storage cavity (52) is connected with the secondary injection molding channel (23) and a second injection molding machine, the heat preservation storage barrel (5) is provided with an automatic material return mechanism (6), the automatic material return mechanism (6) comprises a first piston (51) arranged in the first storage cavity (51), a second piston (55) and a second piston (55) penetrates out of the second storage cavity (55), and a second piston (55), the connecting rod of the first piston (54) is fixedly connected with the connecting rod of the second piston (55) through a lifting support (56), the lifting support (56) is driven by a driving device (4) to lift, and two sides of the top of the second material storage cavity (52) are connected with a secondary injection molding channel (23) and a second injection molding machine.

2. The motor mold for preventing the clogging of the injection molding passage according to claim 1, wherein: elastic buffer mechanisms (57) are arranged between the first piston (54) and the connecting rod thereof and between the second piston (55) and the connecting rod thereof.

3. The motor mold for preventing clogging of an injection passage according to claim 1 or 2, wherein: and a cooling water channel is arranged around the die cavity (21) in the lower die (2).

4. The motor mold for preventing the clogging of the injection molding passage according to claim 1, wherein: the upper die (1) and the lower die (2) are provided with guide holes (200) which are aligned, and guide columns are arranged in the guide holes (200).

5. The utility model provides a prevent motor mold that passageway blockked up of moulding plastics, includes mould (1) and lower mould (2), it forms the die cavity to go up mould (1) and lower mould (2) compound die, be provided with core (3) in the die cavity, core (3) are including at least one activity core portion, it moulds plastics passageway (23) once to be provided with on mould (1) and mould plastics passageway (22) and secondary, be provided with a plurality of exhaust passage on lower mould (2), its characterized in that: the exhaust passage is internally provided with a one-way valve which only has an air outlet direction and can be circulated, the primary injection molding passage (22) and the secondary injection molding passage (23) are respectively connected with a first material return passage (24) and a second material return passage (25), the first material return passage (24) and the second material return passage (25) are respectively provided with a one-way valve which only has an air inlet direction and can be circulated, the primary injection molding passage (22) and the secondary injection molding passage (23) are connected with a heat preservation storage barrel (5), the heat preservation storage barrel (5) comprises a first storage cavity (51) and a second storage cavity (52), the peripheries of the first storage cavity (51) and the second storage cavity (52) are provided with electric heating wires (53), the two sides of the first storage cavity (51) are connected with the primary injection molding passage (22) and a first injection molding machine, the second storage cavity (52) is connected with the secondary injection molding passage (23) and a second injection molding machine, the heat preservation storage barrel (5) is provided with an automatic material return mechanism (6), the automatic material return mechanism (6) comprises a first storage cavity (51) arranged on the side surface of the first storage cavity and a second piston (59) and a second piston (58) and a second piston (511) arranged in communication with a second piston (59), all slide in third piston chamber (511) and be provided with fourth piston (512), two the connecting rod of third piston (510) connects one respectively fourth piston (512), be provided with expend with heat and contract with cold medium in third piston chamber (511), work as when expend with heat and contract with cold medium cooling, third piston (510) remove will once mould plastics passageway (22) with the material in the passageway (23) of moulding plastics of twice inhales in heat preservation storage vat (5).

6. The motor mold for preventing the clogging of the injection molding passage according to claim 5, wherein: and a cooling water channel is arranged around the die cavity (21) in the lower die (2).