阅读说明：本技术 双色发泡注射成型机及其射嘴 (Double-color foaming injection molding machine and nozzle thereof ) 是由 王建 于 2021-07-17 设计创作，主要内容包括：本申请涉及一种双色发泡注射成型机及其射嘴,射嘴包括输入件以及输出件；所述输入件设有两个进料流道；所述输出件设有内流道以及外流道；所述内流道连通一个进料流道,且所述内流道远离进料流道的开口为出料孔口；所述外流道连通另一个进料流道,所述外流道远离进料流道的开口为出料环口,且所述出料环口套设于出料孔口外侧。注塑生产时,将未着色的原料通过一个进料流道注入内流道,并从出料孔口处喷出；将着色后的原料通过另一个进料流道注入外流道,并从出料环口处喷出；则着色的原料包覆至未着色的原料的外周,并一同注入注塑模具内成型；使得着色的原料形成产品的外表面,不影响产品的外观、颜色；产品内部未着色,实现减少色母粒的用量,实现成本控制。(The application relates to a double-color foaming injection molding machine and a nozzle thereof, wherein the nozzle comprises an input part and an output part; the input piece is provided with two feeding runners; the output part is provided with an inner flow passage and an outer flow passage; the inner flow passage is communicated with a feeding flow passage, and an opening of the inner flow passage, which is far away from the feeding flow passage, is a discharging hole; the outer runner is communicated with the other feeding runner, an opening of the outer runner, which is far away from the feeding runner, is a discharging ring opening, and the discharging ring opening is sleeved outside the discharging hole opening. During injection molding production, injecting uncolored raw materials into the inner runner through a feeding runner, and spraying out from the discharge hole; injecting the colored raw materials into the outer runner through the other feeding runner, and spraying out from the discharge ring opening; the colored raw materials are coated to the periphery of the uncolored raw materials and are injected into an injection mold together for molding; the colored raw materials form the outer surface of the product, and the appearance and the color of the product are not influenced; the interior of the product is not colored, so that the use amount of the color master batch is reduced, and the cost control is realized.)

1. A nozzle, characterized by: comprises an input part (1) and an output part (2); the input piece (1) is provided with two feeding runners; the output piece (2) is provided with an inner flow passage and an outer flow passage;

the inner flow passage is communicated with a feeding flow passage, and an opening of the inner flow passage, which is far away from the feeding flow passage, is a discharging hole opening (21); the outer runner is communicated with the other feeding runner, an opening of the outer runner, which is far away from the feeding runner, is a discharging ring opening (22), and the discharging ring opening (22) is sleeved on the outer side of the discharging hole opening (21).

2. The nozzle of claim 1, wherein: the output part (2) comprises a sleeve (23) and a mandrel (24) which are coaxial, and the sleeve (23) is sleeved outside the mandrel (24); the sleeve (23) is provided with a first flow passage and a second flow passage which are communicated with each other; the first flow channel and the second flow channel are respectively provided with two flow channels and are in one-to-one correspondence;

the opening of the first flow passage, which is far away from the second flow passage, is positioned at the end surface of the sleeve (23), and the opening is used for communicating any one feeding flow passage; the second flow passage is positioned at the inner periphery of the sleeve (23) away from the opening of the first flow passage;

the mandrel (24) comprises a large shaft (241) and a small shaft (242) which are coaxial;

the large shaft (241) is coaxially embedded into the sleeve (23), and the outer periphery of the large shaft (241) is attached to the inner periphery of the sleeve (23); a flow channel groove (243) is formed in the periphery of the large shaft (241), and the flow channel groove (243) extends in the direction close to the small shaft (242) and penetrates through the large shaft (241); the runner groove (243) is communicated with a second runner;

the outer diameter of the small shaft (242) is smaller than the inner diameter of the sleeve (23) so as to form the discharge ring opening (22) on the outer periphery of the small shaft (242) and the inner periphery of the sleeve (23);

the mandrel (24) is provided with a flow passage hole (244), and one end opening of the flow passage hole (244) is positioned on the periphery of the large shaft (241) and is used for communicating another second flow passage; the other end opening of the flow passage hole (244) is positioned at the end surface of the small shaft (242) departing from the large shaft (241) to form the discharge hole (21).

3. The nozzle of claim 2, wherein: the sleeve (23) comprises an outer sleeve (231), a baffle ring (232) and an inner sleeve (233) which are coaxial; the baffle ring (232) is arranged at the inner periphery of the outer sleeve (231); the inner sleeve (233) is embedded into the outer sleeve (231), the outer periphery of the inner sleeve (233) is attached to the inner periphery of the outer sleeve (231), and the end face of the inner sleeve (233) is attached to the end face of the retaining ring (232);

the periphery of the inner sleeve (233) is provided with an axial groove (234), and the axial groove (234) penetrates through two end faces of the inner sleeve (233); the side wall of the axial groove (234) and the inner circumference of the outer sleeve (231) enclose the first flow passage; the end face, attached to the baffle ring (232), of the inner sleeve (233) is provided with a radial groove (235), the radial groove (235) penetrates through the inner periphery and the outer periphery of the inner sleeve (233), and the radial groove (235) is communicated with the axial groove (234); the side wall of the radial groove (235) and the end face of the baffle ring (232) enclose the second flow passage.

4. The nozzle of claim 2, wherein: the mandrel (24) is coaxially and slidably connected with the sleeve (23); a sealing surface (246) is arranged on the periphery of the large shaft (241), and the sealing surface (246) is positioned on one side, facing the small shaft (242), of the opening of the flow passage hole (244) communicated with the second flow passage; the sealing surface (246) is used for sealing off a second flow channel.

5. The nozzle of claim 2, wherein: the output part (2) further comprises an end cover (25), the end cover (25) is coaxially connected with the sleeve (23), and the end cover (25) is provided with a mixing flow channel (251) and an injection hole (252) which are communicated with each other; the diameter of the mixing flow channel (251) is reduced with the distance from the sleeve (23), and the mixing flow channel (251) is communicated with the discharge ring opening (22) and the discharge hole opening (21);

the injection hole (252) is used for injecting the raw material into the injection mold.

6. The nozzle of claim 1, wherein: the input member (1) comprises a main body (11) and a sealing member (12);

the main body (11) is provided with a material injection hole (111) and a communication flow channel which are communicated with each other; one end of the communicating flow passage, which is close to the output part (2), is communicated with the inner flow passage or the outer flow passage; one end of the communication flow channel, which is far away from the output part (2), is communicated with the material injection hole (111), and the included angle between one end of the communication flow channel, which is communicated with the material injection hole (111), and the material injection hole (111) is not 0;

one end of the communication flow channel, which is far away from the output part (2), penetrates through the input part (1); the sealing element (12) is slidably embedded in the communicating flow channel, and the outer periphery of the sealing element (12) is attached to the inner periphery of the communicating flow channel; the periphery of the sealing piece (12) is used for plugging the material injection hole (111).

7. The nozzle of claim 6, wherein: the communication flow channel comprises a communication hole (113) and a process hole (112), and the inner diameter of the communication hole (113) is smaller than that of the process hole (112);

the process hole (112) is vertical to the material injection hole (111), and the material injection hole (111) is communicated with the inner periphery of the process hole (112);

the sealing element (12) is slidably embedded in the process hole (112), and the outer periphery of the sealing element (12) is attached to the inner periphery of the process hole (112);

and a material breaking bolt (13) is further connected in the fabrication hole (112) in a threaded manner, and the material breaking bolt (13) is used for extruding the end face, deviating from the communication hole (113), of the sealing element (12).

8. The nozzle of claim 7, wherein: one end of the material breaking bolt (13) away from the sealing element (12) is provided with a conical surface, and the end with the large diameter of the conical surface faces the material breaking bolt (13); meanwhile, the maximum diameter of the conical surface is larger than the inner diameter of the communication hole (113).

9. A two-color foaming injection molding machine comprising a frame (3) and a nozzle according to any one of claims 1 to 8, characterized in that: also comprises two feeding devices (4); the feeding device (4) is arranged on the rack (3);

-one said feed device (4) for injecting material into one said feed runner; and the other feeding device (4) is used for injecting raw materials into the other feeding runner.

10. The two-color foaming injection molding machine according to claim 9, characterized in that: the device also comprises a turntable (6) and an indexing device (7); the rotary table (6) is rotatably connected with the rack (3), a plurality of stations are arranged on the rotary table (6) at intervals along the circumferential direction of the rotary table, and the stations are used for mounting an injection mold;

the dividing device (7) is used for driving the rotary disc (6) to rotate so that a certain working position is opposite to the nozzle.

Technical Field

The application relates to the field of injection molding machines, in particular to a double-color foaming injection molding machine and a nozzle thereof.

Background

An injection molding machine is a main molding apparatus for molding thermoplastic plastics or thermosetting plastics into plastic products of various shapes using a plastic molding die.

During injection production, after a certain amount of plastic is heated and plasticized within a specified time, molten plastic is injected into a mold cavity through a nozzle at a certain pressure and speed, and a product is formed after cooling. Meanwhile, in the production process, functional master batches are usually added into the raw materials to change various properties of the plastic, such as: foaming master batches, color master batches, flame-retardant master batches and the like.

When the color master batch is used for adjusting the color of the plastic, the price of the color master batches with different colors is greatly different. The general black color master batch is cheaper, and the colorful color master batch is relatively expensive; the color master batches with partial colors are expensive, so that the production cost is influenced.

Disclosure of Invention

In order to control the production cost of injection molding, the application provides a double-color foaming injection molding machine and a nozzle thereof.

In a first aspect, the present application provides a nozzle of a two-color foaming injection molding machine, which adopts the following technical scheme:

a nozzle comprising an input and an output; the input piece is provided with two feeding runners; the output part is provided with an inner flow passage and an outer flow passage;

the inner flow passage is communicated with a feeding flow passage, and an opening of the inner flow passage, which is far away from the feeding flow passage, is a discharging hole; the outer runner is communicated with the other feeding runner, an opening of the outer runner, which is far away from the feeding runner, is a discharging ring opening, and the discharging ring opening is sleeved outside the discharging hole opening.

By adopting the technical scheme, during injection molding production, uncolored raw materials are injected into the inner flow channel through the feeding flow channel and are sprayed out from the discharge hole; injecting the colored raw materials into the outer runner through the other feeding runner, and spraying out from the discharge ring opening; the colored raw materials are coated to the periphery of the uncolored raw materials and are injected into an injection mold together for molding; the colored raw materials form the outer surface of the product, and the appearance and the color of the product are not influenced; the interior of the product is not colored, so that the use amount of the color master batch is reduced, and the cost control is realized.

Optionally, the output member includes a sleeve and a mandrel, and the sleeve is sleeved outside the mandrel; the sleeve is provided with a first flow passage and a second flow passage which are communicated with each other; the first flow channel and the second flow channel are respectively provided with two flow channels and are in one-to-one correspondence;

the opening of the first flow channel, which is far away from the second flow channel, is positioned at the end surface of the sleeve, and the opening is used for communicating any one feeding flow channel; the opening of the second flow passage, which is far away from the first flow passage, is positioned on the inner periphery of the sleeve;

the mandrel comprises a large shaft and a small shaft which are coaxial;

the large shaft is coaxially embedded into the sleeve, and the outer periphery of the large shaft is attached to the inner periphery of the sleeve; the periphery of the large shaft is provided with a runner groove, and the runner groove extends towards the direction close to the small shaft and penetrates through the large shaft; the runner groove is communicated with a second runner;

the outer diameter of the small shaft is smaller than the inner diameter of the sleeve, so that the discharge ring opening is formed on the outer periphery of the small shaft and the inner periphery of the sleeve;

the mandrel is provided with a flow passage hole, and an opening at one end of the flow passage hole is positioned on the periphery of the large shaft and is used for communicating another second flow passage; and the opening at the other end of the flow passage hole is positioned at the end surface of the small shaft deviating from the large shaft to form the discharge hole opening.

By adopting the technical scheme, the sleeve is matched with the mandrel to form an inner flow passage, a discharge orifice, an outer flow passage and a discharge ring opening; the output piece adopts split type design, is convenient for the production and processing of output piece.

Optionally, the sleeve includes an outer sleeve, a baffle ring and an inner sleeve which are coaxial; the baffle ring is arranged at the inner periphery of the outer sleeve; the inner sleeve is embedded into the outer sleeve, the outer periphery of the inner sleeve is attached to the inner periphery of the outer sleeve, and the end face of the inner sleeve is attached to the end face of the baffle ring;

the periphery of the inner sleeve is provided with an axial groove, and the axial groove penetrates through two end faces of the inner sleeve; the side wall of the axial groove and the inner periphery of the outer sleeve surround the first flow channel; the end face of the inner sleeve, which is attached to the baffle ring, is provided with a radial groove, the radial groove penetrates through the inner periphery and the outer periphery of the inner sleeve, and the radial groove is communicated with the axial groove; the side wall of the radial groove and the end face of the baffle ring surround the second flow passage.

By adopting the technical scheme, the outer sleeve, the baffle ring and the inner sleeve are matched with each other to form a first flow passage and a second flow passage; the sleeve adopts a split design, so that the first flow passage and the second flow passage can be conveniently processed.

Optionally, the mandrel is coaxially slidably connected to the sleeve; the periphery of the large shaft is provided with a sealing surface, and the sealing surface is positioned on one side of the flow passage hole communicated with the opening of the second flow passage, which faces the small shaft; the sealing surface is used for sealing off a second flow channel.

By adopting the technical scheme, the first movable core shaft moves before injection molding, and the sealing surface blocks the second flow channel;

during injection molding, the colored raw materials are firstly sprayed out from the discharge ring opening and injected into an injection mold; then, keeping the injection of the colored raw materials, driving the mandrel to reset, enabling the runner hole to be communicated with the second runner, enabling the uncolored raw materials to start to be injected, coating the colored raw materials to the periphery of the uncolored raw materials, and injecting the colored raw materials into the injection mold;

when injection molding is to be completed, injecting the colored raw materials, and driving the mandrel to move again to enable the sealing surface to block the second flow channel; the uncolored raw materials are stopped from being injected, and the colored raw materials are injected into the injection mold, so that the colored raw materials are completely coated into the colored raw materials, and the appearance and the color of the product are prevented from being influenced.

Optionally, the output member further comprises an end cover, the end cover is coaxially connected with the sleeve, and the end cover is provided with a mixing flow channel and an injection hole which are communicated with each other; the diameter of the mixing flow channel is reduced along with the distance from the sleeve, and the mixing flow channel is communicated with the discharge ring opening and the discharge hole opening;

the injection hole is used for injecting the raw material into the injection mold.

Through adopting above-mentioned technical scheme, colored raw materials and uncolored raw materials contact each other in mixing the runner, and the diameter that mixes the runner reduces gradually for fully contact between two kinds of raw materials, and there is the phenomenon of intermixing, in order to avoid the inside and outside layering of product.

Optionally, the input member comprises a main body and a sealing member;

the main body is provided with a material injection hole and a communicating flow passage which are communicated with each other; one end of the communicating flow passage, which is close to the output part, is communicated with the inner flow passage or the outer flow passage; one end of the communicating flow channel, which is far away from the output piece, is communicated with the material injection hole, and the included angle between one end of the communicating flow channel, which is communicated with the material injection hole, and the material injection hole is not 0;

one end of the communication flow passage, which is far away from the output part, penetrates through the input part; the sealing element is slidably embedded in the communicating flow passage, and the outer periphery of the sealing element is attached to the inner periphery of the communicating flow passage; the periphery of the sealing piece is used for plugging the material injection hole.

By adopting the technical scheme, the material injection hole is blocked by the sealing piece before and after injection molding so as to ensure that no raw material leaks at the injection nozzle; the waste of raw materials is reduced, so that the cost is controlled.

Optionally, the communicating flow channel includes a communicating hole and a process hole, and an inner diameter of the communicating hole is smaller than an inner diameter of the process hole;

the fabrication hole is vertical to the material injection hole, and the material injection hole is communicated with the inner periphery of the fabrication hole;

the sealing element is slidably embedded in the technical hole, and the outer periphery of the sealing element is attached to the inner periphery of the technical hole;

and the process hole is internally provided with a material breaking bolt in a threaded connection mode, and the material breaking bolt is used for extruding the end face, deviating from the communicating hole, of the sealing element.

By adopting the technical scheme, when the material injection hole needs to be plugged, the material breaking bolt can be automatically screwed up through the servo motor, so that the material breaking bolt moves along the axial direction of the process hole and pushes the sealing element until the sealing element extrudes the step between the communicating hole and the process hole, and the material injection hole is plugged; adopt disconnected material bolt, on the one hand simple structure, on the other hand, through the auto-lock of screw thread, realize stable shutoff notes material hole.

Optionally, a conical surface is arranged at one end of the material breaking bolt, away from the sealing element, and the end with the large diameter of the conical surface faces the material breaking bolt; meanwhile, the maximum diameter of the conical surface is larger than the inner diameter of the communication hole.

By adopting the technical scheme, before injection molding, the broken bolt sealing piece can be automatically screwed up by the servo motor to extrude the step between the communicating hole and the technical hole, so that the material injection hole is blocked; during injection molding, the material breaking bolt is driven to rotate reversely by the servo motor, so that the material breaking bolt is separated from the sealing element, raw materials with certain pressure are injected into the material injection hole and filled to the periphery of the conical surface, pressure is generated at the conical surface, the pressure pushes the sealing element to be far away from the communicating hole, and then the raw materials are injected into the communicating hole and then are injected into the injection mold;

need not disconnected material bolt pulling sealing member and remove, need not to design connection structure between disconnected material bolt and sealing member promptly for the simple structure of sealing member, be convenient for process.

In a second aspect, the present application provides a two-color foaming injection molding machine, which adopts the following technical scheme:

a double-color foaming injection molding machine comprises a frame, the injection nozzle and two feeding devices; the feeding device is arranged on the frame;

one said feed means for injecting material into one said feed runner; and the other feeding device is used for injecting raw materials into the other feeding runner.

By adopting the technical scheme, the colored raw materials are put into a feeding device, injected into an outer flow passage through a feeding flow passage and sprayed out from a discharge ring opening; uncolored raw materials are put into another feeding device, injected into the inner flow channel through another feeding flow channel and sprayed out from the discharge hole; the colored raw materials form the outer surface of the product, and the appearance and the color of the product are not influenced; the interior of the product is not colored, so that the use amount of the color master batch is reduced, and the cost control is realized.

Optionally, the device further comprises a turntable and an indexing device; the rotary table is rotationally connected with the rack, a plurality of stations are arranged on the rotary table at intervals in the circumferential direction of the rotary table, and the stations are used for mounting an injection mold;

the indexing device is used for driving the rotary table to rotate so that one station is opposite to the nozzle.

By adopting the technical scheme, when the injection molding machine is used for batch production, the injection molding of raw materials, the cooling molding of products, the die opening and the die closing are synchronously carried out at a plurality of stations, so that the production efficiency is improved, and the production cost of single products is reduced.

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

1. during injection molding production, injecting uncolored raw materials into the inner runner through a feeding runner, and spraying out from the discharge hole; injecting the colored raw materials into the outer runner through the other feeding runner, and spraying out from the discharge ring opening; the colored raw materials are coated to the periphery of the uncolored raw materials and are injected into an injection mold together for molding; the colored raw materials form the outer surface of the product, and the appearance and the color of the product are not influenced; the interior of the product is not colored, so that the use amount of color master batches is reduced, and the cost control is realized;

2. during injection molding, the colored raw materials are firstly sprayed out from the discharge ring opening and injected into an injection mold; then, the colored raw materials are injected, the second flow passage is communicated, the uncolored raw materials are injected, and the colored raw materials cover the periphery of the uncolored raw materials and are injected into the injection mold together;

when injection molding is to be completed, injecting the colored raw materials, and blocking the second flow channel; injecting uncolored raw materials and injecting colored raw materials into the injection mold to completely coat the colored raw materials into the colored raw materials so as to avoid influencing the appearance and color of the product;

3. the micro-foaming injection molding process reduces the quality of injection molding parts, and is matched with a plurality of stations to realize synchronous injection of raw materials into an injection mold, cooling and molding of products, mold opening and mold closing, so that the production efficiency is improved, and the production cost of single products is reduced.

Drawings

Fig. 1 is a schematic view of the overall structure of the nozzle.

Fig. 2 is a cross-sectional view of the nozzle.

Fig. 3 is an enlarged view at a in fig. 2.

Fig. 4 is a cross-sectional view of the output member.

Fig. 5 is an exploded view of the structure of the output member.

Fig. 6 is a structural schematic diagram of the inner sleeve.

Fig. 7 is a schematic structural view of the mandrel.

Fig. 8 is an enlarged view at B in fig. 4.

Fig. 9 is a schematic view of the overall structure of a two-color foaming injection molding machine.

Fig. 10 is a schematic view of the structure of the feeding device.

FIG. 11 shows a sectional view of the feed conveyor pipe, the inlet piece and the cylinder.

Description of reference numerals: 1. an input member; 11. a main body; 111. a material injection hole; 112. a fabrication hole; 113. a communicating hole; 114. connecting holes; 115. a feed port; 12. a seal member; 13. a material breaking bolt; 2. an output member; 21. a discharge orifice; 22. a discharge ring opening; 23. a sleeve; 231. a jacket; 232. a baffle ring; 233. an inner sleeve; 234. an axial slot; 235. a radial slot; 236. a limiting groove; 24. a mandrel; 241. a large shaft; 242. a small shaft; 243. a runner groove; 244. a flow passage hole; 245. a limiting ring; 246. a sealing surface; 25. an end cap; 251. a mixing flow channel; 252. an injection hole;

3. a frame; 4. a feeding device; 41. a screw conveyor; 42. a delivery pipe; 421. a one-way valve; 43. a pressurizing mechanism; 431. a barrel; 432. a plunger; 433. a pressurized drive member; 5. a material cutting device; 51. a sliding drive member; 6. a turntable; 7. and an indexing device.

Detailed Description

The present application is described in further detail below with reference to figures 1-11.

Referring to fig. 1, the embodiment of the present application discloses a nozzle of a two-color foaming injection molding machine, which comprises an input member 1 and an output member 2 which are fixedly connected.

Referring to fig. 2, the input member 1 includes a main body 11, a sealing member 12, and a material-breaking bolt 13. The main body 11 is provided with two feeding flow passages, and the feeding flow passages include the material injection holes 111 and the communicating flow passages which are communicated with each other. The end of the material injection hole 111 far away from the communicating flow channel is opened at the side wall of the main body 11 for injecting the raw material into the input member 1.

Referring to fig. 2 and 3, the communication flow path includes a process hole 112, a communication hole 113, and a connection hole 114, which communicate with each other. The process hole 112 is coaxial with the communication hole 113 and is perpendicular to the injection hole 111. One end of the process hole 112, which is far away from the communication hole 113, is opened at the side wall of the main body 11, and the inner diameter of the process hole 112 is larger than that of the communication hole 113, so that a step is formed between the process hole 112 and the communication hole 113; meanwhile, the inner circumference of the injection hole 111 is tangent to the step surface, and the injection hole 111 is communicated with the inner wall of the process hole 112. An end of the connection hole 114 remote from the communication hole 113 is opened at a side wall of the main body 11 for discharging the raw material.

The sealing element 12 and the material breaking bolt 13 are coaxially embedded into the processing hole 112. The periphery of the sealing element 12 is in sliding fit with the inner wall of the fabrication hole 112, and sliding sealing is realized; and the end face of the seal member 12 facing the communication hole 113 is formed as a tapered face for pressing a step between the process hole 112 and the communication hole 113; one end of the small end of the conical surface is directed to the communication hole 113 and is used for being embedded into the communication hole 113; meanwhile, the diameter of the large end of the conical surface is equal to the diameter of the fabrication hole 112.

The material breaking bolt 13 is connected in the process through threads, and the material breaking bolt 13 is located on one side, away from the communication hole 113, of the sealing element 12, so that the material breaking bolt 13 is used for extruding the end face, away from the communication hole 113, of the sealing element 12.

Referring to fig. 2 and 4, the output member 2 is provided with an inner flow passage and an outer flow passage; the inner flow passage is used for communicating one connecting hole 114, and one end of the inner flow passage, which is far away from the connecting hole 114, is opened in a hole shape and is a discharging hole opening 21; the outer flow passage is used for communicating with the other connecting hole 114, and the opening of one end of the outer flow passage, which is far away from the connecting hole 114, is annular and is a discharge annular opening 22; meanwhile, the discharge ring opening 22 is sleeved outside the discharge hole opening 21.

Referring to fig. 2 and 4, the output member 2 includes a sleeve 23, a mandrel 24, and an end cap 25. One end of the sleeve 23 can be fixedly connected with the main body 11 through a flange structure; the end cap 25 is fixedly connected to an end of the sleeve 23 away from the main body 11; the core shaft 24 is coaxially embedded in the sleeve 23, and one end of the core shaft 24, which is far away from the end cover 25, penetrates through the main body 11 and then extends out. Meanwhile, the sleeve 23 is provided with two discharging flow passages to communicate with the two connection holes 114, respectively.

The discharging flow channel comprises a first flow channel and a second flow channel which are communicated with each other; an opening of the first flow passage away from the second flow passage is located at an end face of the sleeve 23, the opening being for communicating with the connecting hole 114; the opening of the second flow passage away from the first flow passage is located at the inner wall of the sleeve 23.

Specifically, referring to fig. 4 and 5, the sleeve 23 includes an outer sleeve 231, a stop ring 232, and an inner sleeve 233; one end of the outer sleeve 231 is fixedly connected with the main body 11 through a flange structure; the baffle ring 232 is coaxially arranged in the outer sleeve 231 and is integrally formed; the inner sleeve 233 is coaxially embedded in the outer sleeve 231, the outer periphery of the inner sleeve 233 is attached to the inner periphery of the outer sleeve 231 and sealed, and the inner diameter of the inner sleeve 233 is equal to that of the baffle ring 232; one end of the inner sleeve 233 is attached to the end face of the baffle ring 232 away from the end cover 25; the other end of the inner sleeve 233 is flush with the end surface of the outer sleeve 231 and is adapted to fit the main body 11.

Referring to fig. 4 and 6, the inner sleeve 233 is provided at the outer circumference thereof with an axial groove 234; the axial groove 234 extends along the axial direction of the inner sleeve 233 and penetrates through two end surfaces of the inner sleeve 233, so that the side wall of the axial groove 234 and the inner wall of the outer sleeve 231 surround a first flow passage; and the end face of the inner sleeve 233 attached to the baffle ring 232 is provided with a radial groove 235, the radial groove 235 is communicated with the axial groove 234, and the radial groove 235 penetrates through the inner periphery and the outer periphery of the inner sleeve 233, so that the side wall of the radial groove 235 and the end face of the baffle ring 232 surround a second flow passage. Meanwhile, the inner sleeve 233 and the outer sleeve 231 can be fixed circumferentially by key connection.

Referring to fig. 4 and 7, the mandrel 24 includes a large shaft 241 and a small shaft 242 which are coaxial, the large shaft 241 is located on the side of the small shaft 242 facing away from the end cover 25, and the large shaft 241 penetrates through the main body 11; the diameter of the large shaft 241 is larger than that of the small shaft 242, the outer circumference of the large shaft 241 fits and seals the inner circumference of the inner sleeve 233, and the large shaft 241 is also embedded into the blocking ring 232.

A flow channel groove 243 is formed on the outer periphery of the large shaft 241, and the flow channel groove 243 extends in a direction close to the small shaft 242 and penetrates through the large shaft 241; the channel groove 243 communicates with a second channel; the core shaft 24 is further provided with a flow passage hole 244, one end of the flow passage hole 244 is opened at the periphery of the large shaft 241 and is used for communicating with another second flow passage, so that an inner flow passage is formed by one discharging flow passage and the flow passage hole 244 which are communicated with each other; the other end opening of the flow passage hole 244 is located at the end face of the small shaft 242 facing away from the large shaft 241, forming the discharge orifice 21.

Referring to fig. 4, the end cap 25 is provided with a mixing flow passage 251 and an injection hole 252 which are communicated with each other, the inner diameter of the mixing flow passage 251 is larger than the outer diameter of the small shaft 242, and further, the discharge ring port 22 is formed between the outer circumference of the small shaft 242 and the inner wall of the mixing flow passage 251, and one discharge flow passage, the flow passage groove 243 and the mixing flow passage 251 which are communicated with each other form an outer flow passage. Meanwhile, the diameter of the mixing flow passage 251 decreases away from the sleeve 23.

Referring to fig. 4 and 8, the mandrel 24 is coaxially slidably connected to the sleeve 23; a limiting ring 245 is coaxially arranged on the periphery of the large shaft 241; a limit groove 236 is arranged on the inner periphery of the inner sleeve 233, and the limit groove 236 extends towards the direction close to the main body 11 and penetrates through the end face of the inner sleeve 233; the limiting ring 245 is coaxially and slidably embedded in the limiting groove 236, and an end surface of the limiting ring 245 facing away from the main body 11 is used for being attached to the bottom of the limiting groove 236, so that the flow passage hole 244 is communicated with the second flow passage.

The outer periphery of the large shaft 241 is provided with a sealing surface 246, and the sealing surface 246 is positioned at one side of the flow passage hole 244, which is communicated with the second flow passage and opens towards the small shaft 242; the sealing surface 246 is adapted to close off a second flow passage, and the end surface of the stop ring 245 facing the main body 11 is adapted to engage the main body 11 and allow the sealing surface 246 to close off the second flow passage.

The implementation principle of the nozzle of the double-color foaming injection molding machine in the embodiment of the application is as follows: when in injection molding production, cheap raw materials are injected into the inner runner through a feeding runner and are sprayed out from the discharge hole 21; expensive raw materials are injected into the outer flow channel through the other feeding flow channel and are sprayed out from the discharge ring opening 22; the expensive raw materials are coated to the periphery of the cheap raw materials and are injected into an injection mould together for molding; expensive raw materials are formed on the outer surface of the product, and the appearance and the color of the product are not influenced; to achieve cost control.

Referring to fig. 9, the embodiment of the present application further discloses a two-color foaming injection molding machine, which includes a frame 3, a feeding device 4, the above-mentioned nozzle, a material breaking device 5, a turntable 6, and an indexing device 7.

Referring to fig. 10 and 11, two feeding devices 4 are provided, and each feeding device 4 includes a screw conveyor 41, a feed pipe 42, and a pressurizing mechanism 43. The main body 11 is further provided with a feeding hole 115, the feeding hole 115 is communicated with the inner periphery of the process hole 112, and the feeding hole 115 is tangent to the step surface. The feed delivery pipe 42 is connected between the output end of the screw conveyor 41 and the feed port 115, and a check valve 421 is provided at the feed delivery pipe 42 so that the raw material flows into the feed port 115 from the feed delivery pipe 42 in a single direction.

The pressurizing mechanism 43 includes a cylinder 431, a plunger 432, and a pressurizing driver 433. The cylinder 431 is fixedly connected with the frame 3 and communicated with the material injection hole 111; the plunger 432 is coaxially and slidably embedded in the cylinder 431 and realizes sliding sealing; the pressurized drive 433 may employ an air, oil, or electric cylinder to drive the plunger 432 within the barrel 431. In the embodiment, the cylinder 431 is horizontally disposed.

Referring to fig. 2 and 10, the material cutting device 5 includes a sliding driving member 51 and a rotating driving member (not shown). The sliding driving member 51 can be an air cylinder, an oil cylinder or an electric cylinder, and the sliding driving member 51 is fixedly connected with one side of the main body 11, which is far away from the output member 2, and is used for driving the mandrel 24 to move along the axial direction so as to open or close the inner flow passage. The rotary driving member may adopt a servo motor for driving the rotation of the material breaking bolt 13 to open or close the communication hole 113 by the sealing member 12.

Referring to fig. 9, a turntable 6 is rotatably connected to the frame 3 and located on one side of the injection nozzle away from the feeding device 4, ten stations are arranged on the turntable 6, and each station is used for mounting one set of injection mold; the indexing device 7 can adopt a rotary table and is used for driving the rotary table 6 to rotate and realizing indexing positioning. In this embodiment, the axis of rotation of the turntable 6 is vertical.

The implementation principle of the double-color foaming injection molding machine in the embodiment of the application is as follows: before injection molding, adding a part of raw materials into color master batches to finish coloring; the other part of the raw materials are not colored; and the colored raw material is put into one screw conveyor 41, and the uncolored raw material is put into the other screw conveyor 41; the sliding driving piece 51 drives the mandrel 24 to move so as to seal off a second channel by using the sealing surface 246, namely, close the inner flow channel; the rotary driving piece (servo motor) automatically drives the material breaking bolt 13 to rotate so as to plug the communicating hole 113; the indexing device 7 drives the rotary table 6 to rotate, so that the injection mold on a certain station is opposite to the nozzle;

during injection molding, the screw conveyor 41 injects a certain amount of raw materials into the feed hole 115, and the raw materials flow along the gap between the conical end surface and the step of the sealing element 12 and flow into the cylinder 431 through the material injection hole 111; then, the rotary driving piece automatically drives the material breaking bolt 13 to rotate reversely, so that the material breaking bolt 13 is separated from the sealing piece 12; the pressurized driving member 433 drives the plunger 432 to approach the main body 11, and the raw material having a certain pressure is injected into the feeding hole 115, thereby generating a pressure at the tapered surface of the sealing member 12, which pushes the sealing member 12 away from the communication hole 113, and the raw material is injected into the communication hole 113 and then into the output member 2;

the colored raw materials are firstly sprayed out from the discharge ring opening 22 and injected into an injection mold through injection molding holes; then, keeping the injection of the colored raw material, the sliding driving piece 51 drives the mandrel 24 to reset, so that the flow passage hole 244 is communicated with the second flow passage, i.e. the inner flow passage is opened, so that the uncolored raw material starts to be injected, and the colored raw material is coated to the periphery of the uncolored raw material and is injected into the injection mold together;

when the injection molding is about to be finished, the colored raw material is injected, the sliding driving piece 51 drives the mandrel 24 to move again, so that the sealing surface 246 blocks the second flow passage, and the uncolored raw material stops being injected; the colored raw materials are continuously injected into the injection mold, so that the colored raw materials are completely coated into the colored raw materials, and the appearance and the color of the product are prevented from being influenced;

after the injection molding is finished, the driving element 51 is slid to close the inner flow passage; the rotary driving member is operated to close the communication hole 113; the indexing device 7 drives the rotary table 6 to rotate, so that the injection mold which completes injection molding is far away from the nozzle, and the other injection mold is opposite to the nozzle to prepare for next injection molding.

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.