A dual-color synchronous zone injection molding device

Abstract

This invention relates to a dual-color synchronous zoned injection molding apparatus, comprising a support frame; two injection molding mechanisms, spaced apart on the support frame, for heating and pressurizing a colloid; and a nozzle assembly connecting the two injection molding mechanisms for mixing and spraying two colors of colloid. The assembly includes: a confluence block, installed at the bottom of the injection molding mechanisms, connecting the two mechanisms and confluencing the two different colored colloids; a flow equalization nozzle, installed at the bottom of the confluence block, for statically mixing the confluenced colloids; and a positioning sleeve, pressing the flow equalization nozzle against the confluence block and forming a colloid flow gap between the sleeve and the nozzle, with a spray through-hole at its bottom. This invention improves the mixing uniformity during dual-color synchronous injection molding and reduces the probability of drooling after injection molding.

Description

Technical Field

[0001] This invention relates to the field of injection molding machines, and more particularly to a two-color synchronous zone injection molding apparatus. Background Technology

[0002] Two-color injection molding machines are industrial equipment used to produce multi-color injection molded products. They are mainly used in footwear materials (TPU / TPR soles), consumer electronics (handles, watch straps), automotive parts, and daily necessities.

[0003] A two-color injection molding machine generally includes a worktable, two screw-type injection mechanisms mounted on the worktable, a mixing module for mixing the colloids in the two injection mechanisms, and a nozzle assembly for spraying the mixed colloids. The injection mechanism includes a barrel, a hopper connected to the barrel, a screw rotatably mounted in the barrel, and a drive component for driving the screw to rotate.

[0004] For example, Chinese utility model patent CN209395148U discloses a two-color mixing injection molding device, including a nozzle mechanism, a barrel flow channel mechanism, an injection stage mechanism, a moving mechanism, and a heating mechanism. The nozzle mechanism is fixed to the front end of the barrel mechanism and together with it is fixed to the moving mechanism. The moving mechanism is fixed to the injection stage mechanism. The heating mechanism is located on the barrel mechanism. The barrel mechanism is a barrel with a barrel head, which has two straight-through, bend-free outer and inner flow channels. Screw assembly one and screw assembly two are arranged in parallel inside the barrel, and plasticizing transmission assembly one and plasticizing transmission assembly two are provided to drive the screw assembly to rotate. The nozzle mechanism includes a female nozzle, a female nozzle, and a nozzle head. The female nozzle and the female nozzle are installed at the front end inside the barrel head. The female nozzle has an inner flow channel, and the female nozzle has an outer flow channel. A nozzle head with a common spray outlet is installed at its front end.

[0005] However, while the above-mentioned nozzle head integrates two material channels, it cannot mix and evenly distribute the rubber material flowing through the nozzle. It only performs simple mixing of the two colors of rubber at the end of the nozzle head through the outer and inner flow channels, resulting in poor mixing effect. Furthermore, in vertical injection molding machines, the rubber material is prone to drooling due to its own gravity. Summary of the Invention

[0006] To improve the uniformity of mixing two colors of colloid, the present invention provides a dual-color synchronous zone injection molding device.

[0007] The present invention provides a dual-color synchronous zone injection molding device, which adopts the following technical solution:

[0008] The system includes a support frame; two injection molding mechanisms, spaced apart on the support frame, for heating and pressurizing the colloid; a nozzle assembly connecting the two injection molding mechanisms for mixing and spraying two colors of colloid, comprising a confluence block installed at the bottom of the injection molding mechanism, connecting the two injection molding mechanisms to merge the two different colors of colloid; a flow equalization nozzle installed at the bottom of the confluence block for static mixing of the merged colloid; and a positioning sleeve that presses the flow equalization nozzle against the confluence block and forms a colloid flow gap between the sleeve and the flow equalization nozzle, with a spray through-hole at its bottom.

[0009] Optionally, the bottom outlets of the two injection molding mechanisms are connected to a confluence block. The confluence block has a first flow channel and a second flow channel that connect the two injection molding mechanisms respectively. The top of the flow equalizing nozzle has a vertically opened blind hole that connects to the first flow channel. The side wall of the flow equalizing nozzle has a plurality of flow through holes that connect to the second flow channel at even intervals. The outer wall of the blind hole has a plurality of flow equalizing holes that connect to the flow through holes at even intervals. The positioning sleeve is fitted on the outside of the flow equalizing nozzle, and a flow equalizing gap is formed between the positioning sleeve and the flow equalizing nozzle. The colloid in the flow equalizing holes and the flow through holes is uniformly mixed in the flow equalizing gap.

[0010] Optionally, the bottom of the flow equalization nozzle is provided with a flow guide, the flow guide is inclined, and the side wall of the flow guide is provided with a flow guide groove corresponding to the flow distribution hole.

[0011] Optionally, at least two sets of equalization flow holes are provided at intervals along the length direction of the lower equalization flow nozzle, and guide blocks are provided on both sides of the equalization flow holes.

[0012] Optionally, the flow equalization nozzle includes an upper flow equalization nozzle and a lower flow equalization nozzle. The flow through hole penetrates the upper flow equalization nozzle. The top of the lower flow equalization nozzle is provided with a flow collecting ring groove connected to the flow through hole. The bottom of the flow collecting ring groove is provided with a plurality of flow dividing holes evenly spaced circumferentially. The flow guiding part is provided at the bottom of the lower flow equalization nozzle. The flow guiding groove corresponds to the flow dividing holes. The flow dividing holes are opened correspondingly to the flow equalization holes. The diameter of the flow dividing holes is smaller than the diameter of the flow through hole. The flow blind hole is opened on the lower flow equalization nozzle and penetrates the upper flow equalization nozzle vertically upward.

[0013] Optionally, the positioning sleeve includes an upper positioning sleeve and a lower positioning sleeve, the injection through hole is opened at the center of the lower positioning sleeve, the upper positioning sleeve is sleeved on the outside of the flow equalization nozzle, and the top of the positioning sleeve is fixed to the confluence block.

[0014] Optionally, a check cavity is formed between the upper and lower flow equalization nozzles. A check ball is provided in the check cavity, and a support ring is provided at the bottom of the check ball. A flow passage hole is opened at the center of the support ring, and a flow passage groove is opened on the outer side wall of the support ring to connect the check cavity and the flow passage hole.

[0015] Optionally, the injection molding apparatus further includes a lifting mechanism, which includes a barrel, a screw installed inside the barrel, and a rotary drive for driving the screw to rotate. The barrel is fixed to the bracket, and the end of the screw is fixed to the rotary drive. The lifting mechanism drives the screw to move axially up and down inside the barrel.

[0016] Optionally, the lifting mechanism includes a mounting base for mounting the rotary drive component and a lifting drive component for driving the mounting base to rise and fall. The lifting drive component has a fixed part and a movable part. The fixed part of the lifting drive component is fixedly connected to the bracket, and its movable part is fixedly connected to the mounting base.

[0017] Optionally, the top of the bracket is provided with a support block for the injection molding mechanism to be installed. The center of the support block is provided with a support through hole for the screw to pass through, and the screw is axially slidably installed in the support block.

[0018] In summary, the present invention has at least one of the following beneficial technical effects:

[0019] 1. By setting the nozzle assembly, the two colors of colloid are mixed more evenly after passing through the nozzle assembly;

[0020] 2. By setting up a lifting mechanism, while using the screw to push, additional injection pressure can be provided through the lifting screw, which can further inject into the mold after heat shrinkage, thereby improving the dimensional stability of the product;

[0021] 3. By setting up a lifting component, in conjunction with the check ball and support ring in the check cavity, after injection molding is completed, the entire injection molding mechanism is lifted while the screw is slightly lifted by the lifting mechanism, so that the limited colloid backflow is reduced and the drooling phenomenon generated during injection molding is reduced. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of Example 1.

[0023] Figure 2 This is a schematic diagram of the overall structure from another direction of Embodiment 1.

[0024] Figure 3 This is an exploded structural diagram of the support in Example 1.

[0025] Figure 4This is a partial structural schematic diagram of the injection molding mechanism in Example 1.

[0026] Figure 5 This is a partial structural diagram of the lifting mechanism and support in Embodiment 1.

[0027] Figure 6 This is a partial exploded structural diagram of the lifting mechanism and the injection molding mechanism in Example 1.

[0028] Figure 7 This is a schematic diagram of the overall structure of the mounting base in Example 1.

[0029] Figure 8 This is a partial structural diagram of the nozzle assembly and injection molding mechanism in Example 1.

[0030] Figure 9 This is a schematic diagram of the exploded structure of the nozzle assembly in Example 1.

[0031] Figure 10 This is a cross-sectional structural diagram of the nozzle assembly in Example 1.

[0032] Figure 11 This is a schematic diagram of the overall structure of the nozzle assembly in Example 2.

[0033] Figure 12 This is a schematic diagram of the exploded structure of the nozzle assembly in Example 2.

[0034] Figure 13 This is a schematic diagram of the exploded structure of the flow equalization nozzle in Example 3.

[0035] Figure 14 This is a cross-sectional structural diagram of the nozzle assembly in Example 3.

[0036] Figure 15 This is a schematic diagram of the exploded structure of the nozzle assembly in Example 4.

[0037] Figure 16 This is an exploded structural diagram of the positioning sleeve in Example 4.

[0038] Explanation of reference numerals in the attached drawings: 1. Bracket; 11. Connecting plate; 12. Support frame; 121. Guide through hole; 13. Injection molding mounting plate; 14. Guide rod; 15. Lifting cylinder; 16. Support block; 161. Support through hole; 162. Material discharge through hole; 2. Injection molding mechanism; 21. Barrel; 211. Injection cavity; 212. Discharge hole; 22. Screw; 23. Rotary drive component; 3. Lifting mechanism; 31. Mounting base; 311. Mounting through hole; 32. Lifting drive component; 321. Fixed part; 322. Moving part; 4. Nozzle assembly; 41. Merging block; 411. First flow channel; 41 2. Second flow channel; 42. Flow equalization nozzle; 421. Flow blind hole; 422. Flow equalization hole; 423. Flow guide block; 424. Flow through hole; 425. Flow guide part; 4251. Flow guide groove; 426. Upper flow equalization nozzle; 427. Lower flow equalization nozzle; 4271. Flow collecting ring groove; 4272. Flow dividing hole; 428. Check cavity; 4281. Check ball; 429. Support ring; 4291. Flow passage hole; 4292. Flow passage groove; 43. Positioning sleeve; 431. Flow equalization gap; 432. Positioning slope; 433. Jet through hole; 434. Upper positioning sleeve; 435. Lower positioning sleeve. Detailed Implementation

[0039] The following is in conjunction with the appendix Figure 1 - Appendix Figure 16 The present invention will be described in further detail below.

[0040] This invention discloses a dual-color synchronous zone injection molding device.

[0041] Example 1: Refer to Appendix Figure 1 and attached Figure 2 A dual-color synchronous zone injection molding device includes a support 1, an injection mechanism 2, a lifting mechanism 3, and a nozzle assembly 4. The injection molding device is axially slidably mounted on top of the injection molding machine body to complete the entire injection molding process.

[0042] See attached document Figure 2 and attached Figure 3 The bracket 1 is installed on the working platform of the two-color injection molding machine. The bracket 1 includes a connecting plate 11, support frames 12 set on both sides of the mounting plate, an injection molding mounting plate 13 set on the top of the mounting plate, a guide rod 14 axially slidably installed in the support frame 12, and a lifting cylinder 15 for driving the injection molding mounting plate 13 to rise and fall. The injection molding mechanism 2 is provided in two sets at intervals along the width direction of the mounting plate.

[0043] The support frame 12 is a portal frame 1. Guide holes 121 are vertically opened on both sides of the top of the support frame 12 for the guide rod 14 to pass through. The top of the guide rod 14 is fixedly connected to the injection molding mounting plate 13, and the guide rod 14 passes vertically through the guide holes 121. A lifting cylinder 15 and the guide rod 14 are correspondingly arranged with the support frame 12. The cylinder body of the lifting cylinder 15 is fixed to the injection molding mounting plate 13, and the movable end of the lifting cylinder 15 passes through the injection molding mounting plate 13 and is fixed to the support frame 12. It is used to drive the injection molding mounting plate 13 to lift as a whole, thereby driving the injection molding mechanism 2 mounted on the injection molding mounting plate 13 to lift.

[0044] The top of the injection molding mounting plate 13 is provided with a support block 16. The center of the support block 16 is provided with a support through hole 161. The side wall of the support block 16 is provided with a discharge through hole 162 that connects the external hopper and the internal support through hole 161. The support block 16 is fixedly connected to the injection molding mounting plate 13.

[0045] See attached document Figure 2 and attached Figure 4 The injection molding mechanism 2 includes a barrel 21, a screw 22 installed in the barrel 21, and a rotary drive 23 that drives the screw 22 to rotate.

[0046] The barrel 21 is fixed to the bottom of the injection mounting plate 13. An injection cavity 211 for the flow of the colloid is provided inside the barrel 21. The injection cavity 211 connects to the support through hole 161 and the discharge through hole 162. An outlet hole 212 connecting to the nozzle assembly 4 is provided at the bottom of the barrel 21. The top of the screw 22 is fixed to the rotary drive component 23. In this embodiment, the rotary drive component 23 is a servo motor, and the drive component and the screw 22 are connected by a coupling.

[0047] See attached document Figure 5 The lifting mechanism 3 drives the screw 22 to move axially within the barrel 21. The lifting mechanism 3 includes a mounting base 31 and a lifting drive component 32 that drives the mounting base 31 to move up and down.

[0048] See attached document Figure 6 and attached Figure 7 The mounting base 31 has a mounting through hole 311 at its top for mounting the coupling. The screw 22 passes vertically through the mounting through hole 311 and is inserted into the injection cavity 211 inside the barrel 21. The rotary drive component 23 is fixed to the top of the mounting base 31. In this embodiment, the mounting through hole 311 allows the screw 22 and the coupling to pass through as a whole, facilitating the installation between the screw 22 and the barrel 21.

[0049] The lifting drive component 32 is spaced apart on both sides of the mounting base 31 along the length of the injection molding mounting plate 13. The lifting drive component 32 adopts a double-acting plunger cylinder. The lifting drive component 32 has a fixed part 321 and a moving part 322. The fixed part 321 of the lifting drive component 32 is fixedly connected to the injection molding mounting plate 13, and its moving part 322 is fixedly connected to the mounting base 31.

[0050] See attached document Figure 8 and attached Figure 9 The nozzle assembly 4 connects two injection molding mechanisms 2, mixing and spraying out different colored colloids from the two injection molding mechanisms 2. The nozzle assembly 4 includes a confluence block 41, a flow equalization nozzle 42, and a positioning sleeve 43.

[0051] The merging block 41 is installed at the bottom of the injection molding mechanism 2 and connects the material cylinders 21 on the two injection molding mechanisms 2 to merge two different colored colloids.

[0052] See attached document Figure 9 and attached Figure 10 The top of the confluence block 41 is provided with a first flow channel 411 and a second flow channel 412 that are respectively connected to the discharge holes 212 at the bottom of the two material cylinders 21. Both the first flow channel 411 and the second flow channel 412 are inclined so that the colloid can flow more smoothly under its own gravity.

[0053] The flow equalization nozzle 42 is installed at the bottom of the confluence block 41 to perform static mixing of the confluenced colloids. The top of the flow equalization nozzle 42 has a vertically opening flow blind hole 421 connecting to the first flow channel 411. The outer wall of the flow blind hole 421 has multiple flow equalization holes 422 evenly spaced circumferentially, connecting to the flow through holes 424. Two sets of flow equalization holes 422 are spaced apart along the length of the flow equalization nozzle 42.

[0054] Both sides of the equalization flow hole 422 are provided with flow guide blocks 423, and multiple sets of flow guide blocks 423 are evenly spaced along the length of the lower equalization flow nozzle 427. While realizing the static mixing of the two colored colloids, the flow guide blocks 423 can accelerate the heat transfer between the two colloids, making the heat between the two colloids more uniform.

[0055] Depending on the required mixing ratio of different colors, different flow equalization nozzles 42 can be used. The number of flow equalization holes 422 opened on different flow equalization nozzles 42 is different. At the same time, the rotation speed of the rotary drive component 23 on the two injection molding mechanisms 2 is adjusted to control the flow rate of the colloid in different barrels 21, thereby controlling the required mixing ratio of colors.

[0056] The sidewall of the flow equalization nozzle 42 is evenly spaced with multiple flow holes 424 that connect to the second flow channel 412. The bottom of the flow equalization nozzle 42 is provided with a flow guide 425. The bottom outer wall of the flow guide 425 is inclined. The sidewall of the flow guide 425 is provided with a flow guide groove 4251 corresponding to the flow holes 424.

[0057] A positioning sleeve 43 is fitted onto the outside of the flow equalization nozzle 42. The top of the positioning sleeve 43 is fixedly connected to the confluence block 41. The inner wall of the positioning sleeve 43 is provided with a positioning inclined surface 432 that fits against the side wall of the guide portion. A flow equalization gap 431 is formed between the positioning sleeve 43 and the flow equalization nozzle 42. The colloid in the flow equalization hole 422 and the flow through hole 424 is uniformly mixed in the flow equalization gap 431. A spray through hole 433 is opened at the bottom of the positioning sleeve 43. During installation, the positioning inclined surface 432 fits against the guide portion 425 to achieve positioning of the flow equalization sleeve. The structure is simple and the installation is convenient.

[0058] The operating principle of the above embodiment is as follows: During the injection molding process, the colloid located in the two barrels 21 enters the flow passage 424 and the flow blind hole 421 through the first flow channel 411 and the second flow channel 412, respectively. The colloid entering the flow blind hole 421, after filling the entire flow blind hole 421, flows out from the equalization flow hole 422 and mixes with the colloid flowing through the flow passage 424. Under the action of the guide block 423, the colloid flowing through the gap between the guide blocks 423 undergoes static mixing under the impact of the colloid flowing horizontally out of the equalization flow hole 422, thereby improving the mixing efficiency of the two. When passing through the second set of equalization flow holes 422, the colloid located in the flow blind hole 421 and the mixed colloid located in the equalization flow gap 431 undergo further static mixing, thereby further improving the uniformity of mixing. After the mixed colloid passes through the equalization flow gap 431, it is sprayed out from the injection hole 433 and injected into the mold. After injection molding is completed, the lifting mechanism 3 pushes the screw 22 down. The pressure of the screw 22 allows the internal colloid to be better injected into the mold under pressure, which is used to fill the gaps caused by the heat shrinkage of the colloid and improve the internal density and dimensional stability of the product.

[0059] Example 2: Refer to Appendix Figure 11 and attached Figure 12 The difference between this embodiment and Embodiment 1 is that the flow equalization nozzle 42 includes an upper flow equalization nozzle 426 and a lower flow equalization nozzle 427. A flow through hole 424 is formed on the upper flow equalization nozzle 426, and a flow blind hole 421 is formed on the lower flow equalization nozzle 427, extending upward through the upper flow equalization nozzle 426. At least three flow equalization holes 422 are evenly spaced along the inner wall of the flow blind hole 421. In this embodiment, there are 12 flow equalization holes 422, and the diameter of each flow equalization hole 422 is smaller than the diameter of the flow blind hole 421.

[0060] The top of the lower flow nozzle 427 is provided with a flow collecting ring groove 4271 connected to the flow through hole 424. The bottom of the flow collecting ring groove 4271 is provided with evenly spaced branch flow holes 4272, the diameter of which is smaller than that of the flow through hole 424. This allows the colloid to fill the flow collecting ring groove 4271, reducing the amount of air mixed in with the colloid during injection molding.

[0061] The flow distribution hole 4272 and the flow equalization hole 422 are respectively provided, and the diameter of the flow distribution hole 4272 is the same as that of the flow equalization hole 422. This is to make the two colors of colloid mix more evenly. The flow guide 425 is provided at the bottom of the lower flow equalization tube, and the flow guide groove 4251 is provided corresponding to the flow distribution hole 4272.

[0062] During installation, after combining the lower equalizing nozzle 427 and the upper equalizing nozzle 426, the positioning sleeve 43 is fixed to the confluence block 41 with bolts. The structure is simple and the installation is convenient.

[0063] The principle of the above embodiment is as follows: During the injection molding process, after the colloid passes through the flow through hole 424, since the diameter of the separation through hole is smaller than the diameter of the branch flow hole 4272, the colloid accumulates in the flow ring groove 4271, so that it can completely fill the flow ring groove 4271 before flowing out from the branch flow hole 4272, making the flow of the colloid more uniform; the diameter of the equalization flow hole 422 is smaller than the diameter of the flow blind hole 421, so that the colloid can fill the flow blind hole 421 first, and then flow out from the equalization flow hole 422, making the flow rate of the colloid in the first flow channel 411 more uniform, thereby improving the uniformity of colloid mixing to a certain extent and reducing the air trapped in the colloid during the injection molding process.

[0064] Example 3: Refer to Appendix Figure 13 and attached Figure 14 The difference between this embodiment and Embodiment 2 is that a check cavity 428 is formed between the upper flow equalizer 426 and the lower flow equalizer. A check ball 4281 is disposed within the check cavity 428, and a support ring 429 is disposed at the bottom of the check ball 4281. A flow passage hole 4291 is formed at the center of the support ring 429, and a flow groove 4292 is formed on the outer side wall of the support ring 429, connecting the check cavity 428 and the flow passage hole 4291. During installation, the check ball 4281 and the support ring 429 are simply placed in the check cavity 428 between the upper flow equalizer 426 and the lower flow equalizer. The structure is simple and the installation is convenient.

[0065] The operating principle of the above embodiment is as follows: by setting the check ball 4281 and the check cavity 428, during the injection process, the colloid passes through the check cavity 428 and the flow groove 4292 and enters the lower flow equalizer 427; when the injection is completed, during the process of lifting the entire injection mechanism 2, the lifting mechanism 3 is used to slightly lift the screw 22. At this time, the bottom of the positioning sleeve 43 is separated from the mold, and the colloid in the lower flow equalizer 427 shrinks inward under the action of the screw 22. The check ball 4281 abuts against the upper flow equalizer 426, so that the limited colloid flows back, reducing the drooling phenomenon generated during the injection process.

[0066] Example 4: Refer to Appendix Figure 15 and attached Figure 16 The difference between this embodiment and embodiments 1-3 is that the positioning sleeve 43 includes an upper positioning sleeve 434 and a lower positioning sleeve 435. The upper positioning sleeve 434 is sleeved on the outside of the flow equalization nozzle 42 and is fixed to the confluence block 41. In this embodiment, the upper positioning sleeve 434 and the confluence block 41 are connected by bolts. The injection through hole 433 is opened at the center of the lower positioning sleeve 435, and the lower positioning sleeve 435 is threaded onto the outside of the upper positioning sleeve 434.

[0067] The operating principle of the above embodiment is as follows: during the injection molding process, the colloid needs to flow out through the injection hole 433, which causes significant wear on the lower positioning sleeve 435. It needs to be inspected and replaced regularly. When the wear of the lower positioning sleeve affects the overall injection effect during the use of the two-color injection molding machine, the lower positioning sleeve 435 needs to be replaced. The lower positioning sleeve 435 is threaded onto the outside of the upper positioning sleeve 434. When replacing it, you only need to disassemble the lower positioning sleeve 435 for replacement. The structure is simple and the replacement is convenient.

[0068] The above are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, all equivalent changes made in accordance with the structure, shape and principle of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A dual-color synchronous zone injection molding device, characterized in that, include: support; Two injection molding mechanisms are installed at intervals on the bracket and are used to heat and pressurize the colloid. A nozzle assembly, connecting two injection molding mechanisms, is used to mix and spray two colors of colloid. It includes: a confluence block, installed at the bottom of the injection molding mechanism, connecting the two mechanisms and merging the two different colored colloids; a flow equalizing nozzle, installed at the bottom of the confluence block, for static mixing of the merged colloids; and a positioning sleeve, pressing the flow equalizing nozzle against the confluence block and forming a colloid flow gap between the positioning sleeve and the flow equalizing nozzle, with a spray through-hole at its bottom. The bottom outlets of the two injection molding mechanisms are connected to the confluence block. The confluence block has a first flow channel and a second flow channel respectively connecting the two injection molding mechanisms. The top of the flow equalizing nozzle has a vertically opening flow blind hole connecting to the first flow channel. The side wall of the flow equalizing nozzle has multiple flow through-holes evenly spaced, connecting to the second flow channel. The outer wall of the flow blind hole has multiple flow equalizing holes evenly spaced circumferentially, connecting to the flow through-holes. The positioning sleeve is fitted onto the outside of the flow equalizing nozzle, and a positioning sleeve forms a gap with the flow equalizing nozzle. The flow equalization nozzle has a flow equalization gap, and the colloid in the flow equalization orifice and the flow through-hole are uniformly mixed in the flow equalization gap. The bottom of the flow equalization nozzle is provided with a flow guide, which is inclined and has a flow guide groove corresponding to the flow through-hole on its side wall. At least two sets of flow equalization orifices are spaced apart along the length of the flow equalization nozzle, and flow guide blocks are provided on both sides of the flow equalization orifice. The flow equalization nozzle includes an upper flow equalization nozzle and a lower flow equalization nozzle. The flow through-hole penetrates the upper flow equalization nozzle. The top of the lower flow equalization nozzle is provided with a flow collecting ring groove connected to the flow through-hole. The bottom of the flow collecting ring groove is circumferentially and evenly spaced with multiple flow branching orifices. The flow guide is provided at the bottom of the lower flow equalization nozzle. The flow guide groove corresponds to the flow branching orifice. The flow branching orifice is opened correspondingly to the flow equalization orifice. The diameter of the flow branching orifice is smaller than the diameter of the flow through-hole. The flow blind orifice is opened on the lower flow equalization nozzle and penetrates the upper flow equalization nozzle vertically upward.

2. The dual-color synchronous zone injection molding device according to claim 1, characterized in that: The positioning sleeve includes an upper positioning sleeve and a lower positioning sleeve. The injection through hole is opened at the center of the lower positioning sleeve. The upper positioning sleeve is sleeved on the outside of the flow equalization nozzle. The top of the positioning sleeve is fixed to the confluence block.

3. The dual-color synchronous zone injection molding device according to claim 1, characterized in that: A check cavity is formed between the upper flow equalizer and the lower flow equalizer. A check ball is provided in the check cavity. A support ring is provided at the bottom of the check ball. A flow passage hole is opened at the center of the support ring. A flow passage groove is opened on the outer side wall of the support ring to connect the check cavity and the flow passage hole.

4. The dual-color synchronous zone injection molding device according to claim 1, characterized in that: It also includes a lifting mechanism. The injection molding mechanism includes a barrel, a screw installed in the barrel, and a rotary drive for driving the screw to rotate. The barrel is fixed on the bracket, and the end of the screw is fixed to the rotary drive. The lifting mechanism drives the screw to move axially up and down in the barrel.

5. The dual-color synchronous zone injection molding device according to claim 4, characterized in that: The lifting mechanism includes a mounting base for mounting the rotary drive component and a lifting drive component for driving the mounting base to move up and down. The lifting drive component has a fixed part and a movable part. The fixed part of the lifting drive component is fixedly connected to the bracket, and its movable part is fixedly connected to the mounting base.

6. The dual-color synchronous zone injection molding device according to claim 5, characterized in that: The top of the bracket is provided with a support block for the injection molding mechanism to be installed. The center of the support block has a support through hole for the screw to pass through, and the screw is axially slidably installed in the support block.

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