CN214395282U

CN214395282U - Double-color injection molding equipment for preventing warping deformation of toilet lid

Info

Publication number: CN214395282U
Application number: CN202022719860.4U
Authority: CN
Inventors: 刘惠强
Original assignee: Shenzhen Hexinghong Plastic Processing Co ltd
Current assignee: Shenzhen Hexinghong Plastic Processing Co ltd
Priority date: 2020-11-20
Filing date: 2020-11-20
Publication date: 2021-10-15
Anticipated expiration: 2030-11-20

Abstract

The application relates to double-color injection molding equipment for preventing a toilet cover from warping and deforming, which comprises a water inlet pipeline and a heating assembly arranged on a rack, wherein one end of the water inlet pipeline is used for guiding cooling liquid into a cooling water channel of an injection mold, and the other end of the water inlet pipeline is communicated with the heating assembly; the heating assembly is arranged on the water inlet pipeline and used for heating the cooling liquid. This application has the effect that makes the difficult warp that takes place of toilet lid that injection mold made.

Description

Double-color injection molding equipment for preventing warping deformation of toilet lid

Technical Field

The application relates to the field of injection molding equipment, in particular to double-color injection molding equipment with a toilet cover prevented from warping.

Background

The injection molding is a processing method used for mass production of parts with complex shapes, and is mainly applied to the industrial field, wherein the injection molding process is to inject a heated and melted material into a mold cavity of an injection mold through a pressurizing device, and then the plastic product can be obtained after cooling and solidification.

In the related art, an injection mold for manufacturing a toilet lid is disposed on a frame, and specifically, the injection mold includes an upper mold and a lower mold, and a cooling method of the injection mold generally includes disposing a cooling water channel in the lower mold of the mold, injecting a cooling liquid into the cooling water channel, and then, dissipating heat from the mold through the cooling liquid, thereby achieving a cooling and solidifying purpose.

In view of the above-mentioned related art, the inventors consider that there is a defect that the cooling mode causes the temperature of the mold to be too high, so that the product after cooling and solidification is easy to warp.

SUMMERY OF THE UTILITY MODEL

In order to the difficult warp that takes place of toilet lid that injection mold made, this application provides a toilet lid prevents warp's double-colored injection moulding equipment.

The application provides a double-shot moulding equipment that warp is prevented to toilet lid adopts following technical scheme:

the double-color injection molding equipment for preventing the warping deformation of the toilet cover comprises a water inlet pipeline and a heating assembly arranged on a rack, wherein one end of the water inlet pipeline is used for introducing cooling liquid into a cooling water channel of an injection mold, and the other end of the water inlet pipeline is communicated with the heating assembly; the heating assembly comprises a water tank, a heating wire and a first pressurizing piece, wherein the water tank is used for containing cooling liquid; the electric heating wire is arranged on the bottom of the water tank; the first pressurizing member is provided at an end of the water inlet pipe within the water bath, and serves to introduce the heated coolant into the water inlet pipe.

Through adopting above-mentioned technical scheme, during the cooling injection mold, can be earlier through heating element with the coolant liquid heating back, again with the leading-in inlet channel of coolant liquid, compare in the direct mode with the leading-in cooling water course of coolant liquid, this kind of design has reduced the difference in temperature between coolant liquid and the mould, then the speed of mould cooling can slow down to the difficult warpage's that appears condition of plastic products after making the mould cooling.

Preferably, a circulating pipeline is arranged at one end of the cooling water channel, which is far away from the water inlet pipeline, the cooling water channel is communicated with the circulating pipeline, and the circulating pipeline is detachably connected with the injection mold; the water inlet pipeline comprises a flow dividing part and an extending part, the flow dividing part is bent in a U shape, and two ends of an opening of the flow dividing part are communicated with the cooling water channel; one end of the extension part is communicated with one end of the flow dividing part far away from the opening, and one end of the extension part far away from the flow dividing part extends into the water tank; one end of the circulating pipeline, which is far away from the outlet of the cooling water channel, is communicated with one end of the extension part, which is close to the flow dividing part, and the communication position is positioned between the heating assembly and the flow dividing part.

Through adopting above-mentioned technical scheme, the coolant liquid can flow in the circulating line from the cooling water course after flowing to along with circulating line's flow, the leading-in injection mold of coolant liquid rethread inlet channel is at last, and because of coolant liquid still has the difference in temperature with injection mold this moment, so the coolant liquid can also cool down injection mold, compares in the mode of leading-in the coolant liquid after the heating again, and this kind of design has cyclically utilized the coolant liquid, thereby helps resources are saved.

Preferably, the circulating pipeline is provided with a cooling assembly, and the cooling assembly is used for cooling liquid flowing out of a cooling water channel on the injection mold.

Through adopting above-mentioned technical scheme, because of back in the leading-in injection mold of coolant liquid, injection mold's temperature can reduce, the temperature of coolant liquid then can rise, then accessible cooling module cools down the coolant liquid this moment, in the coolant liquid rethread injection mold after will cooling down again, compare with directly in with coolant liquid rethread injection mold, this kind of design, the difference in temperature between coolant liquid and the injection mold can be bigger, then the injection mold can cool off sooner to can promote cooling efficiency.

Preferably, the circulation conduit is disconnected at the cooling module; the cooling assembly comprises a water tank and a cooling pipeline which are arranged on the rack, and the inner wall of one side of the water tank is fixedly connected with one end of the disconnected part of the circulating pipeline; one end of the cooling pipeline extends into the water tank and is communicated with the circulating pipeline, and the other end of the cooling pipeline is communicated with the other end of the disconnected part of the circulating pipeline.

Through adopting above-mentioned technical scheme, during coolant liquid accessible circulating line led into cooling pipeline, because of the water in the water tank is in normal atmospheric temperature state, then the coolant liquid can carry out heat transfer with the water in the water tank to just reach the purpose of cooling down to the coolant liquid.

Preferably, the cooling pipeline comprises a first cooling pipeline and a second cooling pipeline, one end of the first cooling pipeline is communicated with the other end of the disconnected part of the circulating pipeline, and the other end of the first cooling pipeline extends into the water tank and is communicated with the circulating pipeline; one end of the second cooling pipeline is communicated with the other end of the disconnected part of the circulating pipeline, the other end of the second cooling pipeline extends into the water tank and is communicated with the circulating pipeline, and the time for the cooling liquid to flow out of the water tank through the second cooling pipeline is longer than that of the first cooling pipeline; the cooling assembly further comprises a reversing piece, one end of the reversing piece is communicated with one end, far away from the water tank, of the disconnected position of the circulating pipeline, the other end of the reversing piece is communicated with one ends, far away from the water tank, of the two cooling pipelines respectively, and the reversing piece is used for adjusting the flow direction of cooling liquid.

Through adopting above-mentioned technical scheme, when needs cool down sooner, accessible switching-over piece makes coolant liquid to second cooling pipe way department, because of the coolant liquid through the second cooling pipe way the time of flowing out the water tank longer compare first cooling pipe can be longer, then the coolant liquid is behind second cooling pipe, the temperature of coolant liquid can descend ground more, thereby make the difference in temperature between injection mold and the coolant liquid bigger, and then can cool down injection mold sooner, this kind of design, can adjust the temperature of coolant liquid according to injection mold's actual conditions, thereby can promote cooling injection mold's efficiency on the basis that is difficult for taking place warpage.

Preferably, the direction changing member includes: the device comprises an installation shell, a reversing wheel, a bevel gear and a driving piece, wherein one end of the installation shell is communicated with one end, far away from a water tank, of the disconnected part of a circulating pipeline, and the other end of the installation shell is respectively communicated with two cooling pipelines; the reversing wheel is rotatably arranged on the inner side wall of one part of the installation shell communicated with the cooling pipelines, water passing holes are formed in the reversing wheel and can be respectively communicated with the two cooling pipelines, and conical clamping teeth are further arranged on the circumferential side surface of the reversing wheel; the bevel gear is rotatably arranged in the mounting shell and meshed with the conical clamping teeth on the reversing wheel; the driving piece is arranged on the mounting shell and used for driving the bevel gear to rotate around the axis of the driving piece.

Through adopting above-mentioned technical scheme, when the flow direction of coolant liquid needs to be changed, accessible driving piece drive bevel gear rotates, and bevel gear just enables the reverse wheel and rotates, and the water hole rotation just can be made to the rotatory in-process of reverse wheel, treats that the water hole just can get into one of them cooling tube during with one of them cooling tube intercommunication, thereby just reaches the purpose that changes the coolant liquid flow direction.

Preferably, the installation shell is provided with a propping piece, and when the water hole is communicated with one of the cooling pipelines, the propping piece is used for enabling the reversing wheel to prop against the inner wall of the installation shell close to one side surface of the inner wall of the installation shell.

Through adopting above-mentioned technical scheme, can be when crossing the water hole and one of them cooling pipeline intercommunication, through the piece that supports, make the switching-over wheel support the inner wall of tight installation casing, then the coolant liquid is at the in-process that flows, the difficult switching-over wheel that makes of coolant liquid rotates to cross the water hole and can be in the feed through state with cooling pipeline steadily, and then the coolant liquid can flow into the water tank steadily when the switching-over piece, in addition when the switching-over wheel supports tight installation casing inner wall, the coolant liquid is difficult to flow into in another cooling pipeline from the gap between switching-over wheel and the installation casing, thereby more accurately to the coolant liquid processing of cooling down.

Preferably, the cooling water channels are provided in two groups, and the two groups of cooling water channels are respectively arranged in an upper die and a lower die of the injection mold.

Through adopting above-mentioned technical scheme for injection mold's cooling is more even, and then injection mold's last mould and lower mould are difficult for appearing great difference in temperature, thereby make the difficult condition that warp appears of plastic products who makes.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the water inlet pipeline and the heating assembly, the temperature difference between the cooling liquid and the mold is reduced, and the cooling speed of the mold is slowed, so that the plastic product cooled by the mold is not easy to warp and deform;

2. by the arrangement of the circulating pipeline, the cooling liquid is circularly utilized, so that resources are saved;

3. through cooling module's setting for the difference in temperature between coolant liquid and the injection mold can be bigger, then the injection mold can cool off sooner when the coolant liquid rethread injection mold in, thereby can promote cooling efficiency.

Drawings

FIG. 1 is a perspective view of an injection mold of a two-color injection molding apparatus according to an embodiment of the present application.

Fig. 2 is a cross-sectional exploded view of a specific structure embodying a cooling module.

Description of reference numerals: 1. a frame; 2. a water inlet pipe; 21. an extension portion; 22. a flow dividing section; 3. a heating assembly; 31. a water tank; 32. an electric heating wire; 33. a first pressing member; 4. injection molding a mold; 41. an upper die; 42. a lower die; 43. a liquid inlet; 44. a liquid outlet; 5. a circulation pipe; 51. a confluence section; 52. a water guide part; 6. a cooling assembly; 61. a water tank; 62. a cooling duct; 621. a first cooling duct; 622. a second cooling conduit; 63. a reversing member; 631. installing a shell; 632. a reversing wheel; 6321. a conical latch; 6322. water passing holes; 633. a bevel gear; 634. a drive member; 6341. a connecting rod; 6342. a handle block; 7. an abutting piece; 71. a connecting ring; 72. a bolt; 8. a rotating shaft; 81. perforating; 9. mounting holes; 10. a second pressing member.

Detailed Description

The present application is described in further detail below with reference to figures 1-2.

The embodiment of the application discloses a double-shot moulding equipment of warping deformation is prevented to toilet lid. Referring to fig. 1 and 2, the injection molding apparatus includes an injection mold 4 disposed on a frame 1, specifically, the injection mold 4 includes an upper mold 41 and a lower mold 42, each of the upper mold 41 and the lower mold 42 is disposed with a cooling water channel, in this embodiment, according to a flowing direction of the cooling water channel, a liquid inlet starting end of the cooling water channel is defined as a liquid inlet 43, and a liquid outlet end of the cooling water channel is defined as a liquid outlet 44.

Referring to fig. 1 and 2, a water inlet pipe 2 is arranged on the injection mold 4, specifically, the water inlet pipe 2 includes a flow dividing portion 22 and an extending portion 21, the flow dividing portion 22 is a circular pipe made of stainless steel, the flow dividing portion 22 is bent in a U-shape, one end of an opening of the flow dividing portion 22 is communicated with a liquid inlet 43 on the upper mold 41, and the other end of the opening is communicated with a liquid inlet 43 on the lower mold 42; the extending portion 21 is a stainless steel circular tube, one end of the extending portion 21 is communicated with one end of the flow dividing portion 22 far away from the opening, and the other end extends in a direction far away from the injection mold 4.

Referring to fig. 1 and 2, a heating assembly 3 is disposed on the frame 1, and specifically, the heating assembly 3 includes: a water tank 31, an electric heating wire 32 and a first pressurizing member 33, wherein the water tank 31 is rectangular and made of stainless steel, the water tank 31 is welded on the frame 1, the notch of the water tank 31 faces upwards, and one end of the extension part 21 far away from the shunt part 22 extends into the water tank 31 from the notch of the water tank 31; the heating wire 32 is disposed on the bottom of the water tank 31, and the heating wire 32 is electrically connected to an external wire, so that when the cooling liquid is poured into the water tank 31, the heating wire 32 is energized, thereby heating the cooling liquid.

Referring to fig. 1 and 2, in the embodiment, the first pressure member 33 is a water pump, and the first pressure member 33 is mounted on one end of the extension portion 21 in the water tank 31 through a flange, so that when the heating wire 32 heats the coolant to a certain temperature, a worker can start the first pressure member 33 to make the coolant enter the extension portion 21, and then the coolant enters the flow dividing portion 22 along with the extension portion 21 and finally enters the cooling water channels of the upper mold 41 and the lower mold 42, respectively, so that the upper mold 41 and the lower mold 42 of the injection mold 4 can be cooled simultaneously, and the cooled plastic product is not easily warped and deformed.

Referring to fig. 1 and 2, the injection mold 4 is further provided with a circulation duct 5, specifically, the circulation duct 5 includes a confluence portion 51 and a water guide portion 52, the confluence portion 51 is a stainless steel circular tube, the confluence portion 51 is bent in a U-shape, one end of an opening of the confluence portion 51 is communicated with the liquid outlet 44 on the upper mold 41, and the other end is communicated with the liquid outlet 44 on the lower mold 42; the water guide part 52 is a stainless steel circular tube, one end of the water guide part 52 is communicated with one end of the confluence part 51 far from the opening, the communication position is located at one side where the confluence part 51 is communicated with the lower die 42, the other end of the water guide part 52 is communicated with one end of the extension part 21 close to the diversion part 22, and one end of the water guide part 52 close to the extension part 21 is bent towards the diversion part 22.

Referring to fig. 1 and 2, the cooling module 6 is disposed on the water guide portion 52, and the water guide portion 52 is disconnected at the cooling module 6, specifically, the cooling module 6 includes a water tank 61 and a cooling pipeline 62, the water tank 61 is in a rectangular parallelepiped shape and is made of stainless steel, the water tank 61 is fixed on the rack 1 and is located below the heating module 3, a vertical outer wall on one side of the water tank 61 is welded on one end of the disconnected portion of the water guide portion 52 close to the extending portion 21, and an end of the disconnected portion of the water guide portion 52 on the other side close to the confluence portion 51 extends, and an inner wall on the upper side of the water tank 61 can be opened, so that water in the water tank 61 can be replaced regularly.

Referring to fig. 1 and 2, the cooling duct 62 includes a first cooling duct 621 and a second cooling duct 622, the first cooling duct 621 is a stainless steel circular tube, one end of the first cooling duct 621 extends into the water tank 61 and communicates with the water guide portion 52, and the other end extends toward one end of the water guide portion 52 where the water guide portion 52 is disconnected and which is close to the merging portion 51; the second cooling duct 622 is also a circular tube made of stainless steel, one end of the second cooling duct 622 extends into the water tank 61 and is bent upward to communicate with one end of the first cooling duct 621 close to the water guide portion 52, the other end extends to the end of the water guide portion 52 where the water guide portion 52 is disconnected and close to the confluence portion 51, and the length of the second cooling duct 622 in the water tank 61 is longer than that of the first cooling duct 621.

Referring to fig. 1 and 2, the cooling assembly 6 further includes a reversing member 63, and specifically, the reversing member 63 includes: the installation housing 631 is rectangular and made of stainless steel, the installation housing 631 is fixed on the frame 1 and located below the heating assembly 3, one vertical outer wall of the installation housing 631 is communicated with one ends of the two cooling pipes 62 located outside the water tank 61, and the other vertical outer wall is communicated with one end of the water guide part 52 at the position where the water guide part 52 is disconnected and close to the confluence part 51.

Referring to fig. 1 and 2, the installation housing 631 has through holes 81 formed in vertical outer walls of opposite sides thereof, the through holes 81 have a circular cross section, the through holes 81 are provided with a rotating shaft 8 through a waterproof bearing, the rotating shaft 8 is a stainless steel rod, and two ends of the rotating shaft 8 extend out of the through holes 81.

Referring to fig. 1 and 2, the reversing wheel 632 is cylindrical and made of stainless steel, the reversing wheel 632 is sleeved at one end of the rotating shaft 8 close to the cooling pipes 62, the reversing wheel 632 is located in the mounting casing 631, the reversing wheel 632 is welded to the rotating shaft 8, in addition, a water through hole 6322 with a circular cross section is further formed in the surface of one side of the reversing wheel 632 away from the cooling pipes 62, and in the rotating process of the reversing wheel 632, the water through hole 6322 can be respectively communicated with the two cooling pipes 62.

Referring to fig. 1 and 2, a mounting hole 9 is formed in an upper outer wall of the mounting housing 631, the driving member 634 is disposed on the mounting hole 9, specifically, the driving member 634 includes a connecting rod 6341 and a handle block 6342, the connecting rod 6341 is a round rod made of stainless steel, the connecting rod 6341 is rotatably connected to an inner wall of the mounting hole 9 through a waterproof bearing, and one end of the connecting rod 6341 is located in the mounting housing 631 and the other end is located outside the mounting housing 631; the handle block 6342 is in a rectangular parallelepiped shape and made of stainless steel, the handle block 6342 is welded at one end portion of the connecting rod 6341 located outside the mounting case 631, and the handle block 6342 is disposed coaxially with the connecting rod 6341.

Referring to fig. 1 and 2, a bevel gear 633 is made of stainless steel, the bevel gear 633 is welded at one end of the connecting rod 6341 inside the mounting housing 631, and the bevel gear 633 is disposed coaxially with the connecting rod 6341; the side surface of the periphery of the reversing wheel 632, which is far away from one end of the cooling pipeline 62, is provided with a conical latch 6321, and the conical latch 6321 is meshed with a bevel gear 633, when the handle block 6342 is rotated, the bevel gear 633 can drive the reversing wheel 632 to rotate, so that the cooling liquid guided into the installation housing 631 can flow into different cooling pipelines 62, and the cooling liquid passes through the water tank 61 through different cooling pipelines 62, so that the temperature of the cooling liquid can be reduced differently, and the temperature of the cooling liquid can be adjusted according to the actual situation of the injection mold 4, thereby improving the working efficiency.

Referring to fig. 1 and 2, the mounting housing 631 is provided with a fastening member 7, specifically, the fastening member 7 includes a connecting ring 71 and a bolt 72, the connecting ring 71 is an annular ring made of stainless steel, the connecting ring 71 is welded on a vertical outer wall of the mounting housing 631 on a side away from the cooling pipe 62, an inner ring of the connecting ring 71 also sleeves the rotating shaft 8, and the connecting ring 71 and the rotating shaft 8 are coaxially arranged; the bolt 72 is made of stainless steel, the bolt 72 is in threaded connection with the connecting ring 71, the bolt 72 can be rotated to enable the bolt 72 to be abutted against the rotating shaft 8, when the bolt 72 is not screwed, one side surface of the reversing wheel 632, which is close to the cooling pipeline 62, is abutted against the inner wall of the mounting shell 631, so that when cooling liquid flows into the cooling pipeline 62 from the mounting shell 631, the reversing wheel 632 is not easy to rotate, the cooling liquid is also not easy to flow into the cooling pipeline 62 from a gap between the reversing wheel 632 and the mounting shell 631, and the cooling treatment can be carried out on the cooling liquid more accurately.

Referring to fig. 1 and 2, a second pressurizing member 10 is disposed at one end of the water guide 52 close to the extension 21, in this embodiment, the second pressurizing member 10 is a water pump, and the second pressurizing member 10 enables the cooling liquid cooled by the cooling module 6 to be injected into the extension 21, and then the cooling liquid is injected into the cooling pipe 62 of the injection mold 4 again through the flow dividing portion 22, so that the purpose of recycling the cooling liquid is achieved, and resource saving is facilitated.

The implementation principle of the double-shot moulding equipment of this application embodiment closestool lid warp-proof deformation is: when the injection mold 4 is to be cooled, the cooling liquid can be poured into the water tank 31, and then the heating wire 32 is energized, so that the temperature of the cooling liquid rises, when the cooling liquid rises to a suitable temperature, the first pressurizing member 33 can be activated, and then the cooling liquid flows into the extending portion 21, and then the cooling liquid is injected into the cooling water channels of the upper mold 41 and the lower mold 42 through the flow dividing portion 22, at this time, the upper mold 41 and the lower mold 42 are cooled simultaneously, and then the cooling liquid flows into the confluence portion 51 from the cooling water channels, and finally enters the cooling module 6 through the water guiding portion 52.

When the cooling liquid enters the cooling module 6, the cooling liquid will enter the installation housing 631 first, at this time, the worker can rotate the bevel gear 633 through the driving member 634 according to the actual situation of the injection mold 4, the bevel gear 633 will make the reversing wheel 632 rotate, so that the water through hole 6322 is communicated with different cooling pipes 62, when the position of the water through hole 6322 is adjusted, the bolt 72 can be rotated to make the bolt 72 prop against the rotating shaft 8, at this time, the reversing wheel 632 is not easy to rotate, then the cooling liquid will enter the cooling pipe 62 from the water through hole 6322, the cooling liquid can be cooled after passing through the water tank 61, so that the temperature of the cooling liquid is reduced, when the cooling liquid flows out of the water tank 61 and enters the water guide portion 52, at this time, the first pressurizing member 33 is closed and the second pressurizing member 10 is opened, then the second pressurizing member 10 can guide the cooled cooling liquid into the extending portion 21, make the coolant liquid follow reposition of redundant personnel portion 22 pour into injection mold 4 into again at last to just reach the purpose that cyclic utilization coolant liquid cooled off injection mold 4, this kind of design, on the one hand, come to cool off injection mold 4 through the coolant liquid after the heating, make the difference in temperature between injection mold 4 and the coolant liquid less, thereby make the injection moulding product that obtains after the cooling difficult emergence warp, on the other hand, make the coolant liquid can cyclic utilization, help resources are saved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a two-color injection moulding equipment of buckling deformation is prevented to toilet lid which characterized in that: the cooling device comprises a water inlet pipeline (2) and a heating assembly (3) arranged on a rack (1), wherein one end of the water inlet pipeline (2) is used for guiding cooling liquid into a cooling water channel of an injection mold (4), and the other end of the water inlet pipeline is communicated with the heating assembly (3); the heating assembly (3) comprises a water tank (31), a heating wire (32) and a first pressurizing piece (33), wherein the water tank (31) is used for containing cooling liquid; the electric heating wire (32) is arranged on the bottom of the water tank (31); the first pressurizing member (33) is provided at an end of the water inlet pipe (2) within the water tank (31), and serves to introduce the heated coolant into the water inlet pipe (2).

2. The dual color injection molding apparatus for preventing warpage of a toilet lid as claimed in claim 1, wherein: a circulating pipeline (5) is arranged at one end of the cooling water channel, which is far away from the water inlet pipeline (2), the cooling water channel is communicated with the circulating pipeline (5), and the circulating pipeline (5) is detachably connected with the injection mold (4); the water inlet pipeline (2) comprises a flow dividing part (22) and an extending part (21), the flow dividing part (22) is bent in a U shape, and two ends of the opening of the flow dividing part (22) are communicated with the cooling water channel; one end of the extension part (21) is communicated with one end, far away from the opening, of the flow dividing part (22), and one end, far away from the flow dividing part (22), of the extension part (21) extends into the water tank (31); one end, far away from the outlet of the cooling water channel, of the circulating pipeline (5) is communicated with one end, close to the flow dividing part (22), of the extending part (21), and the communication position is located between the heating assembly (3) and the flow dividing part (22).

3. The bi-color injection molding apparatus for preventing warpage of a toilet lid as claimed in claim 2, wherein: and a cooling assembly (6) is arranged on the circulating pipeline (5), and the cooling assembly (6) is used for cooling liquid flowing out of a cooling water channel on the injection mold (4).

4. The bi-color injection molding apparatus for preventing warpage of a toilet lid as claimed in claim 3, wherein: the circulation duct (5) is disconnected at the cooling assembly (6); the cooling assembly (6) comprises a water tank (61) and a cooling pipeline (62) which are arranged on the rack (1), and the inner wall of one side of the water tank (61) is fixedly connected with one end of the disconnected part of the circulating pipeline (5); one end of the cooling pipeline (62) extends into the water tank (61) and is communicated with the circulating pipeline (5), and the other end of the cooling pipeline is communicated with the other end of the disconnected part of the circulating pipeline (5).

5. The bi-color injection molding apparatus for preventing warpage of a toilet lid as claimed in claim 4, wherein: the cooling pipeline (62) comprises a first cooling pipeline (621) and a second cooling pipeline (622), one end of the first cooling pipeline (621) is communicated with the other end of the disconnected part of the circulating pipeline (5), and the other end of the first cooling pipeline (621) extends into the water tank (61) and is communicated with the circulating pipeline (5); one end of the second cooling pipeline (622) is communicated with the other end of the disconnected part of the circulating pipeline (5), the other end of the second cooling pipeline extends into the water tank (61) to be communicated with the circulating pipeline (5), and the time for the cooling liquid to flow out of the water tank (61) through the second cooling pipeline (622) is longer than that of the first cooling pipeline (621); the cooling assembly (6) further comprises a reversing piece (63), one end of the reversing piece (63) is communicated with one end, far away from the water tank (61), of the disconnected part of the circulating pipeline (5), the other end of the reversing piece is communicated with one ends, far away from the water tank (61), of the two cooling pipelines (62) respectively, and the reversing piece (63) is used for adjusting the flow direction of cooling liquid.

6. The bi-color injection molding apparatus for preventing warpage of a toilet lid as claimed in claim 5, wherein: the direction change member (63) includes: the device comprises an installation shell (631), a reversing wheel (632), a bevel gear (633) and a driving piece (634), wherein one end of the installation shell (631) is communicated with one end, far away from a water tank (61), of a disconnected part of a circulating pipeline (5), and the other end of the installation shell is respectively communicated with two cooling pipelines (62); the reversing wheel (632) is rotatably arranged on one inner side wall of the installation shell (631) communicated with the cooling pipelines (62), water passing holes (6322) are formed in the reversing wheel (632), the water passing holes (6322) can be respectively communicated with the two cooling pipelines (62), and conical clamping teeth (6321) are further arranged on the peripheral side surface of the reversing wheel (632); the bevel gear (633) is rotatably arranged in the mounting shell (631), and the bevel gear (633) is meshed with the conical clamping teeth (6321) on the reversing wheel (632); the driving piece (634) is arranged on the mounting shell (631), and the driving piece (634) is used for driving the bevel gear (633) to rotate around the axis of the driving piece.

7. The bi-color injection molding apparatus for preventing warpage of a toilet lid as claimed in claim 6, wherein: the installation shell (631) is provided with a propping piece (7), and when the water passing hole (6322) is communicated with one of the cooling pipelines (62), the propping piece (7) is used for enabling the reversing wheel (632) to prop against the inner wall of the installation shell (631) close to the surface of one side of the inner wall of the installation shell (631).

8. The dual color injection molding apparatus for preventing warpage of a toilet lid as claimed in claim 1, wherein: the cooling water channels are arranged in two groups, and the two groups of cooling water channels are respectively arranged in an upper die (41) and a lower die (42) of the injection mold (4).