Multi-cavity rapid color changing hot runner structure

Abstract

The utility model discloses a kind of multi-cavity quick color-changing hot runner structures, including shunt seat, multiple second material guiding mechanism, mould core and multiple air valve, the outside of shunt seat is covered with second heating assembly, grading runner is opened in shunt seat, grading runner includes main runner, branch runner is formed on main runner, arc surface is opened in grading runner, last grading runner is opened on shunt seat, last grading runner is arc, branch runner is communicated with last grading runner, injection channel is opened in shunt area, injection channel is communicated with last grading runner, second material guiding mechanism is penetrated with second material channel, second material channel is communicated with injection hole, third heating assembly is sleeved on the outside of second material guiding mechanism, forming cavity is opened in mould core, second material channel is communicated with forming cavity, valve needle is fixedly connected on the output shaft of air valve.The utility model provides a kind of multi-cavity quick color-changing hot runner structure, by improving the runner of shunt seat, it is convenient for new glue material to flush and replace old glue material.

Description

Technical Field

[0001] This utility model relates to the field of molds, and in particular to a multi-cavity hot runner structure for rapid color change. Background Technology

[0002] In the production process of injection molding multi-color products, the cleaning efficiency of the mold runner system directly affects the color change speed and the consistency of the finished product appearance. In the existing technology, the mold mostly adopts a common runner structure, which distributes the molten rubber to multiple injection cavities through multi-branch runners to complete the filling. When it is necessary to change the color of the rubber, it is necessary to rely on the new rubber to continuously flush the runner to replace the old rubber residue.

[0003] However, this type of multi-cavity runner design has significant drawbacks in actual color change processes. The branch runner paths corresponding to multiple injection cavities are complex and have a large total volume. When the rubber flows in the runner, due to the tortuous path and uneven flow velocity, it is easy to form local stagnation areas on the inner wall of the runner. This causes the old rubber to adhere to the wall and local areas, which is difficult to be effectively washed away by the new rubber. When mixed with the new rubber during injection molding, it forms discolored particles or streaks, resulting in uneven color or defects on the surface of subsequent high-gloss or light-colored products, forcing the production line to frequently stop and manually clean the mold. Utility Model Content

[0004] The purpose of this invention is to provide a multi-cavity, fast-color-changing hot runner structure. By improving the flow channel of the distributor seat, it is easier to flush and replace the old adhesive with new adhesive.

[0005] The technical solution adopted by the multi-cavity rapid color-changing hot runner structure disclosed in this utility model is:

[0006] The device includes a flow divider, multiple second material guiding mechanisms, a mold core, and multiple air valves. The flow divider is covered with a second heating assembly. A grading flow channel is formed within the flow divider, including a main flow channel that branches into multiple branch flow channels. Two arc-shaped surfaces are formed at the branching points of each branch flow channel. The flow divider has multiple flow dividing zones, each containing a final-stage grading flow channel that is arc-shaped. The branch flow channels are connected to the middle of the final-stage grading flow channel. Two injection channels are formed within each flow dividing zone. The two injection channels are respectively connected to both ends of the final stage flow channel. An injection hole communicating with the injection channel is opened in the flow divider area. A second material channel passes through the second material guiding mechanism. One end of the second material channel is connected to the injection hole. A third heating component is sleeved on the outside of the second material guiding mechanism. Multiple forming cavities are opened in the mold core. The other end of the second material channel is connected to the forming cavity. A valve needle is fixedly connected to the output shaft of the air valve. One end of the valve needle passes through the flow divider seat, the injection hole, and the second material channel in sequence and touches the connection between the second material channel and the forming cavity.

[0007] As a preferred embodiment, the main channel branches at its discharge end to form two primary branch channels, the primary branch channels branch at their discharge ends to form two secondary branch channels, and the secondary branch channels branch at their discharge ends to form two tertiary branch channels. The discharge ends of the tertiary branch channels are connected to the middle of the final stage grading channel.

[0008] As a preferred embodiment, the bifurcation point in the graded flow channel extends with a protrusion, and the two arc surfaces are located on both sides of the protrusion, with the arc surfaces facing the discharge end.

[0009] As a preferred embodiment, the flow divider is composed of a first flow divider plate and a second flow divider plate combined vertically, the main flow channel passes through the first flow divider plate, and the injection channel and injection hole are both located inside the second flow divider plate.

[0010] As a preferred embodiment, it also includes a first material guiding mechanism, on which a first material channel runs through, and a second material channel is connected to the main channel.

[0011] As a preferred embodiment, the system further includes a mold base, which has a receiving cavity for placing a flow divider. The mold base has a first mounting groove and a plurality of second mounting grooves that communicate with the receiving cavity. The first material guiding mechanism is placed in the first mounting groove, and the second material guiding mechanism is placed in the second mounting groove. The air valve is fixedly connected to the mold base. The bottom of the mold base has a slot, and the second mounting groove communicates with the slot. The mold core is placed in the slot.

[0012] As a preferred embodiment, multiple heat insulation blocks are fixedly connected to the top of the first diversion plate and the bottom of the second diversion plate, the heat insulation blocks touching the inner wall of the receiving cavity, and a positioning block is fixedly connected to the bottom of the second diversion plate, the positioning block being embedded in the inner wall of the receiving cavity.

[0013] As a preferred embodiment, the mold base includes a first template and a second template, the first mounting groove penetrates the first template, the receiving cavity is located on the second template, the first template covers the receiving cavity, the second mounting groove penetrates the second template, and the groove is located at the bottom of the second template.

[0014] As a preferred embodiment, the air valve is provided with a first air inlet and a second air inlet, the first template is provided with a plurality of air chambers, the air valve is placed in the air chambers, the air valve divides the air chambers into a first chamber and a second chamber, the first air inlet and the second air inlet are respectively connected to the first chamber and the second chamber, and the first template is provided with a first air passage and a second air passage, the first air passage and the second air passage are respectively connected to the first chamber and the second chamber.

[0015] The beneficial effects of the multi-cavity rapid color-changing hot runner structure disclosed in this utility model are:

[0016] The external injection molding mechanism presses the rubber material into the distribution seat through the graded flow channel. The rubber material flows through the graded flow channel of the distribution seat and is injected into the second material channel of the second material guiding mechanism. The second material guiding mechanism guides the rubber material into the molding cavity. The output shaft of the air valve pulls the valve needle to open and close the connection between the second material channel and the molding cavity, so that the air valve controls the second material guiding mechanism to inject the mold core.

[0017] When the rubber compound flows within the distributor, the arc-shaped surface forms an arc bend at the bifurcation point within the graded flow channel, allowing the rubber compound to flow smoothly within the graded flow channel and preventing the formation of vortices at the bifurcation point, which would result in rubber compound residue. The arc-shaped design of the final branch flow channel reduces the flow resistance applied to the rubber compound when it is injected into the final branch flow channel, preventing the formation of vortices at the bifurcation point between the branch flow channel and the final branch flow channel, which would result in rubber compound residue in the distributor area. The two inclined injection channels inject the rubber compound into the second channel through the injection hole, eliminating rubber compound stagnation in the valve needle back cavity. This ensures that when new rubber compound flushes and replaces old rubber compound, old rubber compound is not left in the distributor, which would affect the color of the product.

[0018] The second and third heating components heat and insulate the flow divider and the second material guiding mechanism, respectively, thereby reducing the solidification rate of the adhesive in the flow divider and the second material guiding mechanism, reducing the flow resistance of the adhesive in the flow divider and the second material guiding mechanism, improving the efficiency of new adhesive flushing and replacing old adhesive, and preventing old adhesive from adhering to the wall surface and local areas. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of a multi-cavity rapid color-changing hot runner structure according to the present invention.

[0020] Figure 2 This is a schematic diagram of the first material guiding mechanism, the flow divider, the second material guiding mechanism, and the air valve of a multi-cavity rapid color-changing hot runner structure according to this utility model.

[0021] Figure 3 This is a cross-sectional view of a multi-cavity rapid color-changing hot runner structure according to this utility model.

[0022] Figure 4 This is a schematic diagram of the installation of the first material guiding mechanism of a multi-cavity rapid color-changing hot runner structure according to this utility model.

[0023] Figure 5 This is a schematic diagram of the installation of a flow divider seat for a multi-cavity, rapid color-changing hot runner structure according to this utility model.

[0024] Figure 6 This is a cross-sectional view of the flow divider, the second material guiding mechanism, and the air valve of a multi-cavity rapid color-changing hot runner structure according to this utility model.

[0025] Figure 7This utility model relates to a multi-cavity rapid color-changing hot runner structure. Figure 6 (Area A) Enlarged view.

[0026] Figure 8 This utility model relates to a multi-cavity rapid color-changing hot runner structure. Figure 6 (Area B) Enlarged view.

[0027] Figure 9 This is a schematic diagram of the installation of the second material guiding mechanism of a multi-cavity rapid color-changing hot runner structure according to this utility model.

[0028] Figure 10 This is a cross-sectional view of a spiral insert in a multi-cavity, rapid color-changing hot runner structure according to this utility model.

[0029] Figure 11 This is a cross-sectional view of the valve and the first air passage of a multi-cavity rapid color-changing hot runner structure according to this utility model.

[0030] Figure 12 This is a cross-sectional view of the valve and the second air passage of a multi-cavity rapid color-changing hot runner structure according to this utility model. Detailed Implementation

[0031] The present invention will be further described and illustrated below with reference to specific embodiments and the accompanying drawings:

[0032] Please refer to Figure 1 , Figure 3 , Figure 6 and Figure 7 .

[0033] This utility model provides a multi-cavity rapid color-changing hot runner structure, including a mold base 1, a mold core 2, a first material guiding mechanism 3, a flow divider 4, multiple second material guiding mechanisms 5, and multiple air valves 6.

[0034] The mold base 1 includes a first template 11 and a second template 13; the mold base 1 is provided with a first mounting groove 111 and a plurality of second mounting grooves 131. In this embodiment, it is preferred that there are eight second mounting grooves 131. The first mounting groove 111 penetrates the first template 11, and the second mounting groove 131 penetrates the second template 13; a receiving cavity 132 is provided inside the mold base 1. The receiving cavity 132 is located on the top of the second template 13. The bottom of the first template 11 covers the top of the second template 13. The first mounting groove 111 communicates with the receiving cavity 132. The first template 11 covers the receiving cavity 132, so that the receiving cavity 132 communicates with the outside through the first mounting groove 111. One end of the second mounting groove 131 communicates with the bottom of the receiving cavity 132.

[0035] Furthermore, a slot is provided at the bottom of the mold base 1, the slot is located at the bottom of the second template 13, and the second mounting slot 131 communicates with the slot;

[0036] The mold core 2 has multiple molding cavities. In this embodiment, the molding cavities are preferably eight. The mold core 2 is placed in the slot. The other end of the second mounting groove 131 is inserted into the mold core 2. The other end of the second mounting groove 131 is connected to the molding cavity. The connection between the second mounting groove 131 and the molding cavity has a constricted structure.

[0037] The bottom of the second template 13 is provided with a base plate, and the top of the base plate touches the bottom of the mold core 2.

[0038] Please refer to Figures 1-4 .

[0039] The first material guiding mechanism 3 includes a first nozzle 31; a first material channel 311 passes through the first material guiding mechanism 3, the first material channel 311 passes through the first nozzle 31, a limiting ring 32 is provided at one end of the first nozzle 31, and a flange extends from the other end of the first nozzle 31.

[0040] Furthermore, a first heating assembly 33 is sleeved on the outside of the first nozzle 31. The first heating assembly 33 includes a first heat-conducting pipe 331 and a first heating wire 332. The first heat-conducting pipe 331 is sleeved on the outside of the first nozzle 31, and the first heating wire 332 is embedded in the outside of the first heat-conducting pipe 331. A first retaining ring 312 is snapped onto the outside of the first nozzle 31. The two ends of the first heat-conducting pipe 331 respectively abut against the first retaining ring 312 and the flange, constraining the first heat-conducting pipe 331 between the first retaining ring 312 and the flange.

[0041] The first material guiding mechanism 3 is placed in the first mounting groove 111. The first nozzle 31 passes through the first mounting groove 111. The limiting ring 32 is fixedly connected to one end of the first nozzle 31 and the limiting ring 32 is fixedly connected to the top of the first template 11. The limiting ring 32 constrains the first nozzle 31 within the first mounting groove 111. By conducting electrical energy to the first heating wire 332 to generate heat, the first heat-conducting pipe 331 guides the heat from the first heating wire 332 to the first nozzle 31, thereby heating and insulating the first nozzle 31, slowing down the solidification speed of the adhesive in the first material channel 311, reducing the flow resistance of the adhesive in the first nozzle 31, improving the efficiency of new adhesive flushing and replacing old adhesive, and preventing old adhesive from adhering to the inner wall of the first material channel 311. The inner wall of the first mounting groove 111 is spaced apart from the outer side of the first heat-conducting pipe 331 to prevent the first heat-conducting pipe 331 from contacting the first template 11 and reducing the heat loss of the first material guiding mechanism 3.

[0042] Please refer to Figures 1-3 and Figure 5 , Figure 6 .

[0043] The flow divider 4 is composed of a first flow divider plate 41 and a second flow divider plate 42 joined together vertically. The outer side of the flow divider 4 is covered by a second heating component 43, which includes multiple second electric heating wires. The multiple second electric heating wires cover the top of the first flow divider plate 41 and the bottom of the second flow divider plate 42 respectively. By conducting electrical energy to the second electric heating wires, heat is generated to heat and keep the flow divider 4 warm, which slows down the solidification speed of the adhesive in the flow divider 4, reduces the flow resistance of the adhesive in the flow divider 4, further improves the efficiency of new adhesive flushing and replacing old adhesive, and prevents old adhesive from adhering to the inner wall of the graded flow channel 44 and the bifurcation of the graded flow channel 44.

[0044] The flow divider 4 has a graded flow channel 44, which includes a main flow channel 441. The main flow channel 441 passes through the first flow divider plate 41 and branches into multiple branch flow channels.

[0045] Furthermore, the two discharge ends of the main flow channel 441 branch into two primary branch channels 442. The discharge ends of the primary branch channels 442 branch into two secondary branch channels 443. The discharge ends of the secondary branch channels 443 branch into two tertiary branch channels 444. The primary branch channels 442, secondary branch channels 443, and tertiary branch channels 444 are all located at the bottom of the first flow divider plate 41 and the top of the second flow divider plate 42. The branch channels are divided into three levels, namely the aforementioned primary branch channel 442, secondary branch channel 443, and tertiary branch channel 444.

[0046] Furthermore, two arc-shaped surfaces are formed at the bifurcation point within the grading channel 44, and protrusions 445 extend from the bifurcation point within the grading channel 44. The two arc-shaped surfaces are located on both sides of the protrusions 445, and the arc-shaped surfaces of the multiple protrusions 445 face the discharge end of the main channel 441, the discharge end of the primary branch channel 442, and the discharge end of the secondary branch channel 443, respectively. The arc-shaped surfaces form arc bends at the bifurcation points within the grading channel 44. When the discharge end of the main channel 441 injects the rubber compound into the two primary branch channels 442, the arc-shaped surfaces guide the rubber compound to change direction, allowing the rubber compound to more smoothly pass through the arc bends into the primary branch channels 442. When the discharge end of channel 442 injects the rubber into the two secondary branch channels 443, the arc surface guides the rubber to change direction, allowing the rubber to pass through the arc bend more smoothly into the secondary branch channels 443. When the discharge end of the secondary branch channels 443 injects the rubber into the two tertiary branch channels 444, the arc surface guides the rubber to change direction, allowing the rubber to pass through the arc bend more smoothly into the tertiary branch channels 444. Compared with the right-angle bends of the existing channels, the arc bends can avoid the formation of vortices at the bifurcation points in the graded channels 44, so that when the new rubber replaces the old rubber, the old rubber is not left in the distributor seat 4, which would affect the color of product 21.

[0047] Furthermore, the flow divider 4 is provided with multiple flow divider zones. In this embodiment, eight flow divider zones are preferably provided, with two flow divider zones located at both ends of the three-stage branch flow channel 444. A final-stage graded flow channel 4544 is provided within the flow divider zone. In this embodiment, the final-stage graded flow channel 4544 is preferably arc-shaped. The two ends of the three-stage branch flow channel 444 are respectively connected to the middle of two adjacent final-stage graded flow channels 4544. The arc-shaped design of the final-stage branch flow channel can reduce the flow resistance applied to the rubber material when the branch flow channel is injected into the final-stage branch flow channel, and avoid the formation of vortices at the bifurcation of the branch flow channel and the final-stage branch flow channel, resulting in the residue of rubber material in the flow divider zone.

[0048] Furthermore, two injection channels 451 are provided in the diversion zone. One end of each injection channel 451 is connected to both ends of the final stage grading channel 4544. An injection hole is provided in the diversion zone. The other end of each injection channel 451 is connected to the injection hole. The two injection channels 451 are inclined at a certain angle at both ends of the final stage grading channel 4544 and finally converge at the injection hole.

[0049] The diversion seat 4 is placed inside the receiving cavity 132. Multiple heat insulation blocks 411 are fixedly connected to the top of the first diversion plate 41 and the bottom of the second diversion plate 42. The heat insulation blocks 411 of the first diversion plate 41 touch the bottom of the first template 11, and the heat insulation blocks 411 of the second diversion plate 42 touch the inner wall of the receiving cavity 132. The heat insulation blocks 411 separate the contact between the diversion seat 4 and the inner wall of the receiving cavity 132, so that there is a certain gap between the diversion seat 4 and the receiving cavity 132, avoiding contact between the diversion seat 4 and the first template 11 and the second template 13, and reducing the heat loss of the diversion seat 4.

[0050] Furthermore, a positioning block 421 is fixedly connected to the bottom of the second diverter plate 42. The positioning block 421 is embedded in the inner wall of the receiving cavity 132. The positioning block 421 constrains the diverter seat 4 within the receiving cavity 132 to prevent displacement.

[0051] The flange is fixedly connected to the top of the first diversion plate 41, the first material channel 311 is connected to the main channel 441, and the external injection molding mechanism injects the rubber material into the main channel 441 through the first material channel 311 of the first material guiding mechanism 3.

[0052] Please refer to Figure 2 , Figure 6 , Figure 7 , Figure 9 and Figure 10 .

[0053] In this embodiment, it is preferred that there are eight second material guiding mechanisms 5, which correspond to eight flow distribution zones. Each second material guiding mechanism 5 includes a second nozzle 51, a sprue sleeve 52, a spiral insert 53, a nozzle core 54, and a heat insulation sleeve 541. A second material channel 511 passes through the second material guiding mechanism 5 and passes through the second nozzle 51. A positioning ring extends from the outside of the second nozzle 51 and is close to one end of the second nozzle 51. The sprue sleeve 52 is sleeved on the outside of the second nozzle 51 and is close to the other end of the second nozzle 51.

[0054] Furthermore, the spiral insert 53 is placed inside the sprue sleeve 52, one end of the spiral insert 53 touches the other end of the second nozzle 51, the second material channel 511 passes through the spiral insert 53, and two spiral blades 531 extend from the inner wall of the spiral insert 53.

[0055] Furthermore, the nozzle core 54 is placed inside the sprue sleeve 52, one end of the nozzle core 54 touches the other end of the spiral insert 53, the second material channel 511 passes through the nozzle core 54, and the other end of the second material channel 511 has a constricted structure, with the constricted structure of the second material channel 511 located at the other end of the nozzle core 54.

[0056] Furthermore, the heat insulation sleeve 541 is covered on the end face of the other end of the nozzle core 54, the second material channel 511 passes through the heat insulation sleeve 541, and the gate sleeve 52 touches the heat insulation sleeve 541.

[0057] A third heating component 55 is sleeved on the outside of the second material guiding mechanism 5. The third heating component 55 includes a second heat-conducting pipe 551 and a third electric heating wire 552. The second heat-conducting pipe 551 is sleeved on the outside of the second nozzle 51 and the outside of the sprue sleeve 52. The third electric heating wire 552 is embedded in the outside of the second heat-conducting pipe 551. A second retaining spring 521 is snapped onto the outside of the sprue sleeve 52. The two ends of the second heat-conducting pipe 551 respectively abut against one end of the second nozzle 51 and the second retaining spring 521, thereby heating the second heat-conducting pipe 551. The tube 551 is constrained between the second nozzle 51 and the second retaining ring 521; by conducting electrical energy to the third heating wire 552 to generate heat, the second heat-conducting tube 551 guides the heat of the third heating wire 552 to the second nozzle 51, thereby heating and keeping the second nozzle 51 warm, slowing down the solidification speed of the rubber in the second channel 511, reducing the flow resistance of the rubber in the second nozzle 51, improving the efficiency of new rubber flushing and replacing old rubber, and preventing old rubber from adhering to the inner wall of the second channel 511;

[0058] An annular step is provided at one end of the second mounting groove 131. The annular step is located at the bottom of the receiving cavity 132. The second material guiding mechanism 5 is placed in the second mounting groove 131. The second nozzle 51 is inserted into the second mounting groove 131. The positioning ring is engaged with the annular step to limit the depth of the second nozzle 51 entering the second mounting groove 131 and also to constrain the second nozzle 51 within the second mounting groove 131. One end of the second nozzle 51 touches the bottom of the second diverter plate 42, and one end of the second material channel 511 is connected to the injection hole. The heat insulation sleeve 541 touches the second mounting groove 131 located in the mold core 2. The other end of the second material channel 511 is connected to the molding cavity. The inner wall of the first mounting groove 111 is spaced apart from the outer side of the first heat conduction pipe 331 to avoid the first heat conduction pipe 331 from contacting the first template 11 and reduce the heat loss of the first material guiding mechanism 3. The nozzle core 54 and the mold core 2 are separated by the heat insulation sleeve 541 to avoid direct contact between the nozzle core 54 and the mold core 2 and to prevent the heat loss of the nozzle core 54.

[0059] The adhesive flows through the graded flow channel 44 of the flow divider 4 and is injected into the second material channel 511 of the second material guiding mechanism 5, allowing the second material guiding mechanism 5 to guide the adhesive into the molding cavity. The adhesive solidifies in the molding cavity to form the product 21. The adhesive changes its flow direction at the spiral insert 53. The spiral blade 531 pushes the adhesive to accelerate the flow rate and avoids the adhesive from being stuck on the flow channel wall and valve needle 631.

[0060] Please refer to Figure 1 , Figure 2 , Figure 6 , Figure 8 , Figure 11 and Figure 12 .

[0061] In this embodiment, it is preferred that there are eight air valves 6, and the eight air valves 6 correspond to eight second material guiding mechanisms 5; the air valves 6 are fixedly connected to the mold base 1, and multiple air cavities are opened on the first template 11. In this embodiment, it is preferred that there are eight air cavities, and the eight air cavities correspond to eight air valves 6, with the air valves 6 placed inside the air cavities.

[0062] Furthermore, the air chamber is located at the top of the first template 11. The air valve 6 includes a valve body 61, a cover plate 62, and a piston 63. A first sealing ring is sleeved on the outside of the valve body 61. The valve body 61 is placed inside the air chamber. The cover plate 62 covers the valve body 61 and the air chamber. A second sealing ring is embedded in the cover plate 62. The second sealing ring touches the valve body 61 and is used to seal the gap between the cover plate 62 and the valve body 61 to prevent air in the valve body 61 from flowing out through the gap between the cover plate 62 and the valve body 61. The first sealing ring touches the inner wall of the air chamber. The first sealing ring of the air valve 6 separates the air chamber into a first cavity 121 and a second cavity 122. The first sealing ring is used to isolate the air in the first cavity 121 from the air in the second cavity 122, making them independent.

[0063] Furthermore, two third sealing rings are fitted on the outer side of the valve body 61. The two third sealing rings are respectively close to the two ends of the valve body 61. The first cavity 121 and the second cavity 122 are both located between the two third sealing rings. The third sealing rings touch the inner wall of the air cavity. The third sealing rings are used to fill the gap between the valve body 61 and the air cavity, preventing air in the first cavity 121 and the second cavity 122 from flowing out from the gap between the valve body 61 and the air cavity.

[0064] Furthermore, a fourth sealing ring is fitted on the outer side of the piston 63, and a connecting part extends from the bottom of the piston 63. A fifth sealing ring is fitted on the outer side of the connecting part. The piston 63 is placed inside the valve body 61, and the fourth sealing ring touches the inner wall of the valve body 61. The fourth sealing ring of the piston 63 divides the interior of the valve body 61 into a first chamber 611 and a second chamber 612. The connecting part extends out of the valve body 61, and the fifth sealing ring is used to fill the gap between the valve body 61 and the connecting part to prevent air in the second chamber 612 from flowing out through the gap between the valve body 61 and the connecting part. The air valve 6 has a first air inlet 613 and a second air inlet 614. The first air inlet 613 and the second air inlet 614 are respectively connected to the first chamber 611 and the second chamber 612, and the first air inlet 613 and the second air inlet 614 are respectively connected to the first chamber 121 and the second chamber 122.

[0065] Furthermore, a valve needle 631 is fixedly connected to the output shaft of the air valve 6. The output shaft of the air valve 6 is the connecting part of the piston 63. One end of the valve needle 631 is fixedly connected to the connecting part. Eight valve sleeves 112 are fixedly connected to the first template 11. The valve body 61 is located in the diversion area. One end of the valve needle 631 passes through the valve sleeve 112, the diversion seat 4, the injection hole, and the second material channel 511 in sequence, and touches the connection between the second material channel 511 and the molding cavity. The two injection channels 451 are inclined to inject the rubber material into the second material channel 511 through the injection hole, eliminating the rubber material from being stuck in the back cavity of the valve needle 631. This prevents the old rubber material from being left in the diversion seat 4 when the new rubber material flushes and replaces the old rubber material.

[0066] Furthermore, a first air passage 123 and a second air passage 124 are provided in the first template 11. The first air passage 123 and the second air passage 124 are respectively connected to the first cavity 121 and the second cavity 122. The external compressor is connected to the first air passage 123 and the second air passage 124.

[0067] Air is injected into the first air passage 123 by an external compressor, and the injection of air into the second air passage 124 is paused. The air is injected into the first chamber 611 of the valve body 61 through the first air passage 123, the first cavity 121 and the first air inlet 613, thereby pushing the piston 63 down and causing the valve needle 631 to contact the connection between the second material channel 511 and the molding cavity, stopping the injection of the mold core 2. Air is injected into the second air passage 124 by an external compressor, and the injection of air into the first air passage 123 is paused. The air is injected into the second chamber 612 of the valve body 61 through the second air passage 124, the second cavity 122 and the second air inlet 614, thereby pushing the piston 63 up and causing the valve needle 631 to move away from the connection between the second material channel 511 and the molding cavity, opening the connection between the second material channel 511 and the molding cavity, and starting the injection of the mold core 2.

[0068] This utility model provides a multi-cavity rapid color-changing hot runner structure. The external injection molding mechanism presses the rubber material into the manifold seat through the graded flow channel. The rubber material flows through the graded flow channel of the manifold seat and is injected into the second material channel of the second material guiding mechanism. The second material guiding mechanism guides the rubber material into the molding cavity. The output shaft of the air valve pulls the valve needle to open and close the connection between the second material channel and the molding cavity, so that the air valve controls the second material guiding mechanism to inject the mold core.

[0069] When the rubber compound flows within the distributor, the arc-shaped surface forms an arc bend at the bifurcation point within the graded flow channel, allowing the rubber compound to flow smoothly within the graded flow channel and preventing the formation of vortices at the bifurcation point, which would result in rubber compound residue. The arc-shaped design of the final branch flow channel reduces the flow resistance applied to the rubber compound when it is injected into the final branch flow channel, preventing the formation of vortices at the bifurcation point between the branch flow channel and the final branch flow channel, which would result in rubber compound residue in the distributor area. The two inclined injection channels inject the rubber compound into the second channel through the injection hole, eliminating rubber compound stagnation in the valve needle back cavity. This ensures that when new rubber compound flushes and replaces old rubber compound, old rubber compound is not left in the distributor, which would affect the color of the product.

[0070] The second and third heating components heat and insulate the flow divider and the second material guiding mechanism, respectively, thereby reducing the solidification rate of the adhesive in the flow divider and the second material guiding mechanism, reducing the flow resistance of the adhesive in the flow divider and the second material guiding mechanism, improving the efficiency of new adhesive flushing and replacing old adhesive, and preventing old adhesive from adhering to the wall surface and local areas.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.

Claims

1. A multi-cavity rapid color-changing hot runner structure, characterized in that, include: The flow divider seat has a second heating component covering its outer side. A graded flow channel is formed inside the flow divider seat, including a main flow channel that branches into multiple branch flow channels. Two arc-shaped surfaces are formed at the branch points within the graded flow channels. The flow divider seat has multiple flow divider zones, each containing a final graded flow channel in an arc shape. The branch flow channels are connected to the middle of the final graded flow channel. Two injection channels are formed within each flow divider zone, each connected to one end of the final graded flow channel. Injection holes communicating with the injection channels are also formed within the flow divider zone. Multiple second material guiding mechanisms, each having a second material channel running through it, one end of which is connected to a material injection hole, and a third heating component fitted on the outside of the second material guiding mechanism; The mold core has multiple forming cavities inside, and the other end of the second material channel is connected to the forming cavity; Multiple air valves are provided, and valve needles are fixedly connected to the output shafts of the air valves. One end of the valve needle passes through the flow divider, the injection hole, and the second material channel in sequence, and touches the connection between the second material channel and the molding cavity.

2. The multi-cavity rapid color-changing hot runner structure as described in claim 1, characterized in that, The main channel branches into two primary branch channels at the discharge end, the primary branch channels branch into two secondary branch channels at the discharge end, and the secondary branch channels branch into two tertiary branch channels at the discharge end. The discharge end of the tertiary branch channels is connected to the middle of the final stage grading channel.

3. The multi-cavity rapid color-changing hot runner structure as described in claim 2, characterized in that, The bifurcation point within the graded flow channel has a protrusion extending from it, and the two arc surfaces are located on either side of the protrusion, with the arc surfaces facing the discharge end.

4. The multi-cavity rapid color-changing hot runner structure as described in claim 3, characterized in that, The flow divider is composed of a first flow divider plate and a second flow divider plate combined vertically. The main flow channel passes through the first flow divider plate, and the injection channel and injection hole are both located inside the second flow divider plate.

5. The multi-cavity rapid color-changing hot runner structure as described in claim 4, characterized in that, It also includes a first material guiding mechanism, through which a first material channel runs, and a second material channel is connected to the main channel.

6. The multi-cavity rapid color-changing hot runner structure as described in claim 5, characterized in that, It also includes a mold base, which has a receiving cavity for placing a flow divider. The mold base has a first mounting groove and a plurality of second mounting grooves that communicate with the receiving cavity. The first material guiding mechanism is placed in the first mounting groove, and the second material guiding mechanism is placed in the second mounting groove. The air valve is fixedly connected to the mold base. The bottom of the mold base has a slot, and the second mounting groove communicates with the slot. The mold core is placed in the slot.

7. The multi-cavity rapid color-changing hot runner structure as described in claim 6, characterized in that, Multiple heat insulation blocks are fixedly connected to the top of the first diversion plate and the bottom of the second diversion plate. The heat insulation blocks touch the inner wall of the receiving cavity. A positioning block is fixedly connected to the bottom of the second diversion plate. The positioning block is embedded in the inner wall of the receiving cavity.

8. The multi-cavity rapid color-changing hot runner structure as described in claim 7, characterized in that, The mold base includes a first template and a second template. The first mounting groove passes through the first template, the receiving cavity is located on the second template, the first template covers the receiving cavity, the second mounting groove passes through the second template, and the groove is located at the bottom of the second template.

9. The multi-cavity rapid color-changing hot runner structure as described in claim 8, characterized in that, The air valve has a first air inlet and a second air inlet. The first template has multiple air chambers. The air valve is placed inside the air chambers. The air valve divides the air chambers into a first chamber and a second chamber. The first air inlet and the second air inlet are respectively connected to the first chamber and the second chamber. The first template has a first air passage and a second air passage. The first air passage and the second air passage are respectively connected to the first chamber and the second chamber.

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