CN106738590B

CN106738590B - Casting head jacket for PU material

Info

Publication number: CN106738590B
Application number: CN201611168676.7A
Authority: CN
Inventors: 戴元海; 翁成武
Original assignee: Zhejiang Haifeng Automation Equipment Co ltd
Current assignee: Zhejiang Haifeng Automation Equipment Co ltd
Priority date: 2016-12-16
Filing date: 2016-12-16
Publication date: 2023-01-17
Anticipated expiration: 2036-12-16
Also published as: CN106738590A

Abstract

The utility model provides a casting head overcoat for PU material, has the hollow circular cylinder lateral wall, is provided with the sandwich structure who is used for the cooling water circulation in the lateral wall, the lateral wall includes inner wall and outer wall, is formed with the intermediate layer space between inner wall and the outer wall. In the intermediate layer space, two sealed space bars set up between inner wall and outer wall, extend to the bottom of overcoat from the overcoat top respectively, with inner wall, outer wall and overcoat top sealing connection to keep the interval with the inner wall of overcoat bottom and the sealed laminating department of outer wall respectively, form the hole, form by in the outer jacket lateral wall sandwich structure from this the hole intercommunication be used for two relative intermediate layer parts of cooling water circulation, two intermediate layer part tops still are provided with the cooling water access & exit respectively. The interlayer structure of the casting head jacket enables cooling water to flow more smoothly, simplifies the jacket structure and achieves a good cooling effect.

Description

Casting head jacket for PU material

Technical Field

The invention relates to the technical field of PU (polyurethane) material casting, in particular to a casting head outer sleeve for a PU material.

Background

In the process of pouring the PU (polyurethane) material, pouring equipment is required to pour the PU foaming material into a model, and a corresponding PU product is obtained after foaming in the model.

The existing casting head outer sleeve is complex in structure and poor in heat dissipation performance, and is made of metal materials such as stainless steel. During the use of the product, the high-speed rotation of the mixing head often causes the temperature of the outer sleeve to be overhigh; the PU material is easy to be bonded on the inner wall of the casting head jacket, so that the stirring and casting quality is influenced; the machine needs to be stopped and cleaned continuously in the using process, so that the production efficiency is low; the PU material bonded on the inner wall of the casting head jacket is tightly bonded with the inner wall and is difficult to remove; after the materials are injected for many times, the materials are cleaned by using a solvent and air impact, and the gap between the inner walls is reduced, so that the flow rate is influenced, the product generates bubbles, and the product quality is influenced.

Disclosure of Invention

In order to solve the problems, the invention provides a casting head jacket for PU materials, which is provided with a hollow cylindrical side wall, wherein a sandwich structure for cooling water circulation is arranged in the side wall, the side wall comprises an inner wall and an outer wall, a sandwich space for cooling water to flow is formed between the inner wall and the outer wall, in the sandwich space, two sealing spacing strips are arranged between the inner wall and the outer wall, extend from the top of the jacket to the bottom of the jacket respectively, are in sealing connection with the inner wall, the outer wall and the top of the jacket, and are respectively kept at intervals with the joint part of the inner wall and the outer wall at the bottom of the jacket to form a hole, so that two opposite sandwich parts which are communicated by the hole and used for cooling water circulation are formed in the sandwich structure of the side wall of the jacket, and the tops of the two sandwich parts are respectively provided with a cooling water inlet and outlet.

Further, the surface of one side of the inner wall constituting the stirring space is provided with a PP or PE coating.

Furthermore, the inner wall and the outer wall are of a split structure, and the inner wall is made of PP or PE materials.

Further, the bottom end of the inner wall is bent toward the outer wall and joined to the outer wall at a receiving station of the outer wall.

Further, the top of inner wall is provided with the protruding circle towards the outer wall, and the sealed butt of protruding circle is to the outer wall.

Furthermore, two sealed space bars extend to the bottom of overcoat from the protruding circle lower edge of inner wall respectively to keep the interval with inner wall bottom and outer wall bending seal connecting portion respectively, form the hole.

Further, the top end of the side wall is provided with a flange connected with other parts of the pouring head, and the flange is provided with a clamping connecting hole.

Furthermore, the outer edge of the flange protrudes out of the side wall of the outer sleeve, and a sealing ring mounting annular groove is formed in the end face of the flange.

Further, the flange is integrally formed with the outer wall of the side wall.

Further, an internal thread is formed on the lower inner side of the side wall.

The pouring head jacket has a special interlayer structure, so that cooling water can flow more smoothly, compared with a traditional spiral cooling structure, the jacket has a simplified jacket structure, and can achieve a better cooling effect by adjusting the size of the pore and the flow of the cooling water, and the temperature of equipment can be reduced by more than 5 ℃ under the conditions of the same water pressure and inlet water temperature. In addition, because the inner wall of the casting head outer sleeve is provided with the PP (polypropylene) layer or the PE (polyethylene) layer, raw materials such as PU (polyurethane) materials are not easy to be bonded on the inner wall of the casting head outer sleeve, and compared with the prior art, the casting head outer sleeve can continuously run for a longer time.

Experiments prove that under the condition of using PU (polyurethane) raw materials (new materials), the casting head made of all stainless steel materials generally needs to be cleaned after injecting materials for 200 times, the casting head outer sleeve with the PP or PE layer can normally operate after injecting materials for 600 times, and the operating efficiency is improved by more than 3 times.

Drawings

FIG. 1 is a top view of the casting apparatus of the present invention;

FIG. 2 isbase:Sub>A cross-sectional view ofbase:Sub>A top view of the casting apparatus of the present invention taken along the line A-A;

FIG. 3a is a perspective view of the outer jacket of the casting apparatus of the present invention;

FIG. 3b is a side view of the outer jacket of the casting apparatus of the present invention;

FIG. 3c is a top view of the outer jacket of the casting apparatus of the present invention;

FIG. 3d is a cross-sectional view of the outer jacket of the casting apparatus of the present invention taken along the direction C-C in FIG. 3 b;

FIG. 3e is a cross-sectional view of the outer jacket of yet another embodiment of the casting apparatus of the present invention taken along the line C-C in FIG. 3 b;

FIG. 4a is a perspective view of a nozzle of the pouring apparatus of the present invention;

FIG. 4b is a cross-sectional view of the nozzle of the pouring apparatus of the present invention;

FIG. 5a is a front view of the mixing head of the casting apparatus of the present invention;

FIG. 5b is a cross-sectional view of the mixing head of the casting apparatus of the present invention taken along the direction C-C in FIG. 5 a;

FIG. 5c is a front view of the mixing head core rod of the casting apparatus of the present invention;

FIG. 5d is a side view of a mixing head of yet another embodiment of the casting apparatus of the present invention;

fig. 5e is a front view of a mixing head of yet another embodiment of the casting apparatus of the present invention.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

As shown in fig. 1 and fig. 2, a plurality of bearings 11 are arranged in a bearing seat 1 at the upper part of the pouring head, a main shaft 2 is accommodated in the bearing seat 1, two ends of the main shaft 2 respectively penetrate out from two ends of the bearing seat 1, and a sealing device 12 is arranged at the end part of the main shaft 2 penetrating out of the bearing seat 1, wherein the sealing device 12 can adopt the technology of 201410244757.5 and 201420293401.6 of the inventor. The bearing seat 1 is fixed on the connecting disc 3, the sealing device 12 at the lower part of the bearing seat 1 penetrates through the connecting disc 3, and the main shaft 2 extends into the mixing chamber 4 arranged below the connecting disc 3. The mixing chamber 4 is connected with a cylinder 41, a feeding valve 42, a needle valve 43, a cleaning valve 44, a feed back pressure regulating valve 45 and the like, various PU raw materials are injected into the mixing chamber 4 through one or more material ports, and the end part of the main shaft 2 extending into the mixing chamber 4 is fixedly connected with a mixing head 5 extending along the axial direction of the main shaft 2. The upper part of the mixing head 5 is positioned in the space of the mixing chamber 4, the middle lower part of the mixing head 5 penetrates out of the mixing chamber 4 and is accommodated in the space of an outer sleeve 6 fixed at the lower part of the mixing chamber 4, and a pouring nozzle 7 is arranged at the bottom of the outer sleeve 6. Casting equipment during operation, vertical setting, it is rotatory to drive main shaft 2 by the motor, main shaft 2 is in one of mixing chamber 4 fixed mixing head 5 follows main shaft 2 together rotatoryly, multiple PU raw materials (confirm according to goods) enter into mixing chamber 4 through different material interfaces 42, mix the PU raw materials in

mixing chamber

4 and 6 spaces of overcoat under the rotary action of mixing head 5, the PU material that mixes pours into the grinding apparatus into through material mouth 7 and foams.

As shown in fig. 3a-3d, the outer jacket 6 has a hollow cylindrical side wall 60, and the side wall 60 is provided at one end with a flange 61 for connection to the mixing chamber 4. The flange 61 is provided with a coupling hole 62 for snap-coupling with a corresponding bottom projection of the mixing chamber 4. The outer edge of the flange 61 protrudes from the jacket side wall 60, and an annular groove 64 is formed on the end face of the flange 61 to facilitate the installation of a sealing ring when the flange is connected with the mixing chamber 4 to form a sealing structure. The jacket side walls 60 are provided with a sandwich structure for the circulation of cooling water, as shown in fig. 3c, 3d, comprising an inner wall 601 and an outer wall 602; a convex ring 603 facing the outer wall 602 is arranged at the top end of the inner wall 601, the convex ring 603 is in sealing contact with the outer wall 602, a groove 604 can be arranged at the position where the convex ring 603 is in contact with the outer wall 602, and the sealing purpose is achieved by placing a sealing ring; the inner wall 601 and the outer wall 602 above the convex ring 603 are connected together in a closed manner; the bottom end of the inner wall 601 bends towards the outer wall 602, and is connected with the outer wall 602 in a sealing way at the bearing platform 611 of the outer wall 602; two sealing spacing strips 606 are arranged between the inner wall 601 and the outer wall 602 of the jacket side wall 60 body, extend from the lower edge of the inner wall convex ring 603 to the bottom of the jacket 6 respectively, are in sealing connection with the inner wall 601, the outer wall 602 and the convex ring 603, and keep spacing with the bending sealing connection part of the bottom end of the inner wall 601 and the outer wall 602 respectively to form a pore (not shown), so that the interlayer space between the inner wall 601 and the outer wall 602 is divided, and a cooling water circulation space between the inner wall 601 and the outer wall 602 is formed. Thus, left and right

opposite sandwich portions

607, 608 of the jacket side wall 60 for the circulation of cooling water are formed to communicate through the bottom hole, and two cooling water inlets and

outlets

609, 610 are provided at the tops of the two

opposite sandwich portions

607, 608, respectively. Further, the flange 61 may be integral with the outer wall 602 of the sidewall

And (4) molding. In this embodiment, an outer wall extension 612 is formed by extending the lower part of the receiving platform 611 of the outer wall 602, an internal thread for connecting with the nozzle 7 is formed on the inner side of the outer wall extension 612, and a sealing groove 605 for receiving a sealing ring is provided at the connection part of the outer wall extension 612 and the outer wall receiving platform 611. The inner wall 601 of the jacket side wall 60 is constructed of PP or PE material.

Alternatively, in another embodiment of the present invention, as shown in fig. 3e, the inner wall 601 and the outer wall 602 of the jacket side wall 60 are formed as an integral structure with a sandwich space therebetween, unlike the separate structure of the inner wall 601 and the outer wall 602 forming the cooling water circulation sandwich structure shown in fig. 3 d. Two sealing and spacing strips 606 are arranged between the inner wall 601 and the outer wall 602 of the main body of the jacket side wall 60, extend towards the bottom of the jacket 6 from the top of the jacket top, are hermetically connected with the inner wall 601, the outer wall 602 and the top of the jacket top, and keep spacing from the joint part of the inner wall and the outer wall at the bottom of the jacket to form a pore (not shown), so that the interlayer space between the inner wall 601 and the outer wall 602 is divided to form a cooling water circulation space between the inner wall 601 and the outer wall 602. Thus, left and right

opposite sandwich portions

outlets

609, 610 are provided at the tops of the two

opposite sandwich portions

607, 608, respectively. The inner wall 601 of the jacket side wall 60 has a PP or PE coating on the surface of the side facing the casting head jacket hollow space.

The nozzle 7 is in a funnel-shaped structure with a wide top and a narrow bottom, can be hermetically connected to the outer sleeve in a threaded or clamping manner, and has an inner layer and an outer layer, as shown in fig. 4a and 4b, an inner layer 701 contacting with the casting raw material is made of PP or PE material, or has a PP or PE coating, and an outer layer 702 wrapping the inner layer 701 is made of high-strength material such as stainless steel, so that the overall rigidity of the nozzle 7 is increased. The side surface of the top edge of the funnel-shaped structure of the nozzle 7 is annular, the outer thread 703 connected with the inner thread on the inner side of the inner wall 601 of the outer sleeve 6 is arranged on the side surface of the top of the funnel-shaped structure, an annular groove 704 is formed on the upper surface of the top of the funnel-shaped structure, the inner edge and the bottom of the annular groove 704 are formed by an inner layer 701, the outer edge of the annular groove 704 is formed by an outer layer 702, and the annular groove 704 is used for accommodating a sealing ring and is connected with the outer sleeve 6 in a sealing manner. The outer neck of the funnel-shaped structure of the nozzle 7 has a frustum 705, for example a hexagonal frustum, to facilitate the mounting of the nozzle 7.

Fig. 5a shows a perspective view of the mixing head 5 of the present invention, which comprises four segments, i.e. a wing segment 501, a first spiral segment 502, a stirring convex segment 503 and a second spiral segment 504, from top to bottom (from right to left in fig. 5 a) according to a use state.

The wing segment 501 is located at the uppermost end of the mixing head 5, and has a flange 5011 protruding from the mixing head body 506 at the top end thereof, 3 to 5 wings 5012, preferably 3 wings are protruded from the surface of the mixing head body 506 obliquely with respect to the axial direction of the mixing head body 506, the plurality of wings 5012 are uniformly distributed on the circumferential surface of the mixing head body 506 and have a height of 3 to 6mm, one end of the wing 5012 is connected to the lower surface of the flange 5011, and the other end thereof extends to the upper edge of the first screw section 502, the plurality of wings 5012 have the same inclination angle, the acute angle formed by the wing 5012 and the upper edges of the flange 5011 and the first screw section 502 in this embodiment is 60 °, and those skilled in the art can select the range of 50 to 70 °.

The first spiral section 502 is located at the lower end of the wing section 501, a plurality of spiral protruding strips 5021 are uniformly protruded on the circumferential surface of the mixing head body 506, the spiral direction of the spiral protruding strips 5021 is the same as the inclination direction of the wings 5012 of the wing section 501, and the height is 2-3mm. On the circumferential surface of the middle position of the first spiral section 502, two grooves 5022 with the same size are uniformly dug in the axial direction at intervals, each groove occupies 120 degrees of circumference and is separated by 60 degrees of circumference, and those skilled in the art can also uniformly dig three grooves.

The stirring convex section 503 is located at the lower end of the first spiral section 502, the diameter of the mixing head main body 506 of the stirring convex section 503 is smaller than the diameter of the wing section 501, the first spiral section 502 and the second spiral section 504, and four rows of stirring protrusions are evenly arranged on the surface of the mixing head main body 506 of the stirring convex section 503 in the circumferential direction at intervals, namely four rows of stirring protrusions are arranged in the circumferential direction of the mixing head main body 506 at intervals of 90 degrees. Wherein, the first column of mixing protrusions comprises a first mixing protrusion 5031 adjacent to the first spiral segment 502 and three second mixing protrusions 5032 arranged at regular intervals in sequence along the axis of the mixing head body 506; the first stirring bump 5031 and the second stirring bump 5032 are in the form of bosses, the cross section of the first stirring bump 5031 is rectangular with the axial direction of the mixing head body 506 as the long side, the cross section of the second stirring bump 5032 is in the form of an inverted right-angled trapezoid with the axial direction of the mixing head body 506 as the vertical side, and the inclined direction of the inclined side of the inverted right-angled trapezoid is the same as the spiral direction of the plurality of spiral protrusions 5021 of the first spiral segment 502 and the inclined direction of the fins 5012 of the fin segment 501. The second row of mixing bumps includes three second row of mixing bumps 5032 uniformly disposed corresponding to the gaps between the four

mixing bumps

5031, 5032 in the first row of mixing bumps and one first mixing bump 5031 adjacent to the second spiral segment 504 disposed behind the three second mixing bumps 5032. Similarly, the third and fourth rows of stirring protrusions are uniformly arranged corresponding to the gaps between the adjacent rows of stirring protrusions. The height of the first stirring bump 5031 and the second stirring bump 5032 is 6 to 12mm. In the present embodiment, four rows are taken as an example for description, and those skilled in the art can understand that even rows of stirring protrusions spaced from each other may be arranged on the circumference as above to implement the present invention. In addition, the present invention can also be realized by providing a plurality of second stirring protrusions 5032 uniformly only on the mixing head main body 506 of the stirring protrusion segment 503.

The second spiral section 504 is located at the lower end of the stirring protrusion section 503, and has a plurality of spiral protrusions 5041 and grooves 5042, which have the same structure as the first spiral section 502.

It may be provided that the wing segment 501, the first spiral section 502, the stirring protrusion section 503 and the second spiral section 504 have substantially the same outer diameter. It is also possible to provide that the wing segment 501, the first spiral segment 502 and the second spiral segment 504 have substantially the same outer diameter, and the outer diameter of the mixing protrusion segment 503 is slightly larger than the outer diameter of the wing segment 501, the first spiral segment 502 and the second spiral segment 504, i.e. the top end of the mixing protrusion is higher than the surface of the wing segment 501, the first spiral segment 502 and the second spiral segment 504.

Preferably, the length ratio of the fin section 501, the first spiral section 502, the stirring convex section 503 and the second spiral section 504 in the axial direction of the mixing head 5 is 2:3:4:3.

preferably, the ratio of the height of the tab 5012 of the tab segment 501 to the height of the

helical tabs

5021, 5041 of the first helical segment 502 or the second helical segment 504 is 1:1.5-2.0; the height ratio of the fin 5012 of the fin section 501 to the first stirring protrusion 5031 and the second stirring protrusion 5032 of the stirring protrusion section 503 is 1:3-4.0.

When assembled, the vane segment 501 and the first spiral segment 502 are located in the space of the mixing chamber 4, and the raw material is preferably driven into the middle lower part of the vane segment 501, and the vane segment 501 can press the raw material downwards through the rotation of the mixing head, and the generation of bubbles during the driving of the raw material can be reduced; the stirring convex section 503 and the second spiral section 504 are located in the space of the outer jacket 6. In addition, the mixing head body 506 at the lower end of the second spiral section 504 is provided with an inverted boss 5061 in conformity with the shape of the funnel-shaped nozzle 7.

As shown in fig. 5b and 5c, the mixing head 5 is composed of a core rod 51 and an outer layer 52 which are matched with the shape of the mixing head, wherein the outer layer is formed on the surface of the core rod, is made of a light material, can be made of a PP or PE material, or is provided with a PP or PE coating; the mandrel 51 is preferably made of a metal material such as stainless steel, has a hollow shape, is connected to the main shaft 2, and is rotated by the main shaft 2.

The mandrel 51 comprises a head 511, a connecting rod 512 and a tail connecting part 513, the outer edges of the cross sections of the head 511, the connecting rod 512 and the tail connecting part 513 are circular and are coaxially connected with each other, and two ends of the connecting rod 512 are respectively and coaxially connected with the head 511 and the tail connecting part 513.

Annular protrusions

5112 and 5113 are respectively arranged near the top edge and the bottom edge of club head 511, and a tapered surface 5111 extending downwards is formed on the bottom end surface of club head 511. An annular projection 5131 is arranged near the bottom edge of the rod tail connecting part 513 connected with the connecting rod 512, and another annular projection 5132 is arranged between the annular projection 5131 of the rod tail connecting part 513 and the top edge of the rod tail connecting part 513. The spindle 2 is inserted into the hollow space of the mandrel 51 through the rod tail connecting portion 513.

Because the outer layer material is made of the light material, and the core rod is shaped like a dumbbell, compared with the mixing head made of metal material in the prior art, the mixing head is easy to manufacture, can ensure uniform rotation, and reduces the eccentricity degree, thereby reducing the generation of bubbles in the raw materials and improving the product quality in the mixing process.

Fig. 5d and 5e show perspective views of a mixing head 8 according to another embodiment of the present invention, wherein the mixing head 8 comprises a mixing head main body 81, a top end connecting part 82, a bottom end boss part 83 and a bottom end connecting part 84, the outer edges of the cross sections of the mixing head main body 81, the top end connecting part 82, the bottom end inverted boss part 83 and the bottom end connecting part 84 are circular and coaxially connected with each other, the top end of the mixing head main body 81 is connected with the top end connecting part 82, the bottom end of the mixing head main body 81 is connected with one end of the bottom end connecting part 84, and the other end of the bottom end connecting part 84 is connected with the bottom end inverted boss part 83. Alternatively, the mixing head 8 may omit the bottom end connecting portion 84, and the bottom end of the mixing head main body 81 is directly connected to the bottom end inverted boss portion 83.

The mixing head body 82 is cylindrical, and 6 rows (3 or more) of stirring members are uniformly arranged on the side wall of the mixing head body 81 at intervals, wherein a row of stirring members is arranged on the bottom edge of the mixing head body. Each row of stirring parts comprises 6 (more than or equal to 3) first stirring convex strips 85 surrounding the circumference of the column body, and the 6 first stirring convex strips 85 on the same circumference are uniformly arranged at intervals along the length direction. Each of the first stirring ribs 85 is in the shape of an isosceles boss having an isosceles trapezoidal cross section along the width direction thereof.

The bottom end connecting portion 84 is cylindrical, has a height not greater than the interval between the two rows of stirring members on the mixing head main body 81, and has a diameter smaller than the diameter of the mixing head main body 81. A row of stirring members is provided on one side edge of the bottom end connecting portion 84 to which the bottom end inverted boss portion 83 is connected, and includes 6 (3 or more) second stirring convex strips 86 surrounding the circumference of the column, and the 6 second stirring convex strips 86 on the same circumference are arranged at regular intervals along the length direction thereof. Each of the second stirring convex strips 86 is in the shape of an isosceles boss having an isosceles trapezoidal cross section along the width direction thereof. The length of the second stirring ribs 86 is smaller than the length of the first stirring ribs 85.

The bottom-end inverted boss portion 83 is an inverted conical boss, which is adapted to the shape of the funnel-shaped nozzle 7, and the bottom surface thereof is connected to the bottom-end connecting portion 84 or the mixing head main body 81.

The tip end connecting portion 82 has a cylindrical shape, a chamfered surface 87 is formed at a bottom surface position where the tip end connecting portion 82 is connected to the mixing head body 81, and a spiral tooth 88 is formed on a top surface of the tip end connecting portion 82.

Like the mixing head 5 of the previous embodiment, the mixing head 8 comprises a core rod and an outer layer, wherein the outer layer is formed on the surface of the core rod, is made of a light material, can be made of PP or PE material, or has P P or PE coating; the mandrel 51 is preferably a metal material such as stainless steel, has a hollow shape, is connected to the main shaft 2, and is rotated by the main shaft 2. The mandrel in this embodiment has the same structure as the mandrel in the previous embodiment, and the description thereof is omitted.

While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited thereto, and that various changes and modifications may be made without departing from the spirit of the invention, and the scope of the appended claims is to be accorded the full scope of the invention.

Claims

1. A casting head for PU material, characterized by: comprises a main shaft, a bearing seat, a connecting disc, a mixing chamber, an outer sleeve and a material nozzle,

the main shaft is vertically accommodated in the bearing seat, and one end of the main shaft penetrates out of the lower end of the bearing seat;

the bearing seat is fixed on the connecting disc, and the main shaft penetrates through the connecting disc and extends into a mixing chamber arranged below the connecting disc;

the end part of the main shaft extending into the mixing chamber is fixedly connected with a mixing head extending along the axial direction of the main shaft;

the upper part of the mixing head is positioned in the space of the mixing chamber, the middle lower part of the mixing head penetrates out of the mixing chamber and is accommodated in the outer casing space fixed at the lower part of the mixing chamber, the mixing head comprises an wing segment, a first spiral segment, a stirring convex segment and a second spiral segment from top to bottom, the wing segment is arranged at the uppermost end of the mixing head, the wing segment is provided with a plurality of fins arranged in the axial direction of the wing segment, the plurality of fins are convexly arranged on the surface of the mixing head main body in an inclined mode relative to the axial direction of the mixing head main body, and the plurality of fins are uniformly distributed on the circumferential surface of the mixing head main body and have the same inclination angle; the first spiral section is positioned at the lower end of the wing section, a plurality of spiral raised lines are uniformly and convexly arranged on the circumferential surface of the mixing head main body, and the spiral direction of the plurality of spiral raised lines is the same as the inclined direction of the wing section; the stirring bulge section is positioned at the lower end of the first spiral section, the diameter of the mixing head main body of the stirring bulge section is smaller than the diameter of the mixing head main bodies of the wing section, the first spiral section and the second spiral section, and a plurality of stirring bulges are uniformly arranged on the surface of the mixing head main body of the stirring bulge section in the circumferential direction; the second spiral section is positioned at the lower end of the stirring convex section, a plurality of spiral raised lines are uniformly and convexly arranged on the circumferential surface of the mixing head main body, and the spiral direction of the plurality of spiral raised lines is the same as the inclined direction of the wing pieces of the wing sections;

the jacket is provided with a hollow cylindrical side wall, an interlayer structure for cooling water circulation is arranged in the side wall, the side wall comprises an inner wall and an outer wall, an interlayer space for cooling water to flow is formed between the inner wall and the outer wall, two sealing spacing bars are arranged between the inner wall and the outer wall, extend from the top of the jacket to the bottom of the jacket respectively, are connected with the inner wall, the outer wall and the top of the jacket in a sealing manner, and are respectively kept at intervals with the combination part of the inner wall and the outer wall at the bottom of the jacket to form a hole, so that two opposite interlayer parts communicated with the hole and used for cooling water circulation are formed in the interlayer structure of the side wall of the jacket, and the tops of the two interlayer parts are respectively provided with a cooling water inlet and outlet;

the material nozzle is arranged at the bottom of the outer sleeve;

the inner wall of the jacket side wall and the inner layer of the material nozzle, which are in contact with the casting material, are made of PP or PE material or have a PP or PE coating on their side surface facing the stirring space, a plurality of PU materials are injected into the mixing chamber through one or more material interfaces, and the PU materials are mixed in the mixing chamber and the jacket space.

2. The casting head of claim 1, wherein: the inner wall and the outer wall are of split structures.

3. The casting head according to claim 1 or 2, wherein: the bottom end of the inner wall is bent towards the outer wall and is jointed with the outer wall at the bearing table of the outer wall.

4. The casting head of claim 2, wherein: the top of inner wall is provided with the protruding circle towards the outer wall, protruding sealed butt of circle to the outer wall.

5. The casting head of claim 4, wherein: two sealed space bars extend to the bottom of overcoat from inner wall protruding circle lower edge respectively to keep the interval with inner wall bottom and outer wall bending seal connecting portion respectively, form the hole.

6. The casting head according to claim 1 or 2, wherein: and the top end of the side wall is provided with a flange connected with other parts of the pouring head, and the flange is provided with a clamping connecting hole.

7. The casting head of claim 6, wherein: the outer edge of the flange protrudes out of the side wall of the outer sleeve, and a sealing ring mounting annular groove is formed in the end face of the flange.

8. The casting head of claim 6, wherein: the flange is integrally formed with the outer wall of the side wall.

9. The casting head according to claim 1 or 2, wherein: an internal thread is formed on the lower inner side of the side wall.