Blow head multilayer coextrusion device
By setting up a uniform extrusion device and a co-extrusion device, the problems of uneven extrusion and core material bending in multi-layer co-extrusion equipment are solved, realizing uniform material feeding in the flow channel and multi-layer synchronous extrusion, thus improving the co-extrusion effect and uniformity of the equipment.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- WEIFANG HUAYU PLASTIC MACHINERY
- Filing Date
- 2025-06-27
- Publication Date
- 2026-06-19
AI Technical Summary
Existing multi-layer co-extrusion equipment is prone to problems such as uneven extrusion and core material bending during extrusion, resulting in poor co-extrusion effect and poor uniformity.
By setting up a uniform extrusion device and a co-extrusion device, the material supply inside the flow channel is made uniform, and multiple layers of raw materials are extruded simultaneously in one place to ensure that the core material is subjected to uniform force.
It improves the extrusion effect and uniformity of multi-layer co-extrusion equipment, prevents uneven extrusion and core material bending, and enhances the co-extrusion uniformity of the machine.
Smart Images
Figure CN224374823U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of multi-layer co-extrusion equipment, and in particular to a multi-layer co-extrusion device for a blow molding die head. Background Technology
[0002] Multi-layer blow molding is a blow molding technology used to produce hollow plastic products with high performance requirements. The preform is formed by extrusion through multi-layer co-extrusion equipment.
[0003] Existing multi-layer co-extrusion equipment, such as the Chinese utility model patent CN210161572U (a multi-layer co-extrusion die head for plastic molding), represents a class of prior art whose main structure includes a flow guiding mechanism, a molding die head, and an extruder. The flow guiding mechanism guides the plastic, the molding die head performs multi-layer co-extrusion of the plastic, and the base machine extrudes the plastic.
[0004] However, the existing technology and equipment still have the following problems when in use: During extrusion, each layer of the existing machine is fed through only one flow channel on one side, which easily leads to uneven extrusion and poor co-extrusion effect. In addition, the existing machine extrudes layers of plastic sequentially around the outside of the core material, which easily causes the core material to bend, resulting in poor co-extrusion uniformity. Utility Model Content
[0005] To solve the above-mentioned technical problems, this utility model provides a multi-layer co-extrusion device for blow molding die head, which makes the material supply inside the flow channel uniform by setting a uniform extrusion device, preventing uneven extrusion, improving the co-extrusion effect of the machine, and extruding multiple layers of raw materials simultaneously in one place by setting a co-extrusion device, so that the core material is subjected to uniform force, preventing the core material from bending, and improving the uniformity of machine co-extrusion.
[0006] This utility model discloses a multi-layer co-extrusion device for a blow molding die head, comprising a machine body; and further comprising a uniform extrusion device, a co-extrusion device, an insulation layer, and an extrusion device. The uniform extrusion device, the co-extrusion device, and the extrusion device are all mounted on the machine body, and the insulation layer is mounted on the co-extrusion device. The machine body provides support, the uniform extrusion device facilitates uniform feeding of materials to the co-extrusion device, the co-extrusion device co-extrudes multiple raw materials, the insulation layer insulates and heats the co-extrusion device, and the extrusion device transports the raw materials.
[0007] Preferably, the machine body includes a first bracket, a second bracket, and three third brackets. The first bracket is installed near the preform forming mold, and the second bracket and the three third brackets are all installed on the first bracket. The front end of the second bracket is provided with three sets of threaded holes, mounting groove one, mounting groove two, and mounting groove three; providing support.
[0008] Preferably, the extrusion device includes a core tube, an extrusion tube one, an extrusion tube two, and two extrusion tubes three. The core tube, extrusion tube one, and extrusion tube two are respectively fixedly installed in the mounting groove one, mounting groove two, and mounting groove three of the bracket two. The core tube is located inside the extrusion tube one and the extrusion tube two, and the extrusion tube one is located inside the extrusion tube two. The rear part of the extrusion tube one and the extrusion tube two are both obliquely truncated annular cylindrical structures. The interior of the extrusion tube one and the extrusion tube two is provided with cavities that gradually narrow forward. The two extrusion tubes three are respectively installed at the rear ends of the extrusion tube one and the extrusion tube two. The extrusion tube one and the extrusion tube two, through their own structure, make the raw material entering the interior uniformly distributed in a ring shape.
[0009] Preferably, the co-extrusion device includes co-extrusion block one, co-extrusion block two, co-extrusion block three, three sets of countersunk bolts, bracket four, and extrusion tube. Co-extrusion block one, co-extrusion block two, and co-extrusion block three are sequentially fastened to the front end of bracket two, wherein co-extrusion block one is located at the rear. Co-extrusion block one, co-extrusion block two, and co-extrusion block three cooperate to form three annular flow channels converging at the front end of co-extrusion block three. Each of co-extrusion block one, co-extrusion block two, and co-extrusion block three is provided with a set of countersunk holes, and the three sets of countersunk holes are respectively aligned with three sets of threaded holes of bracket two. The set of countersunk holes on co-extrusion block two and co-extrusion block three are aligned with the countersunk holes on co-extrusion block three. A set of through holes is provided at the position corresponding to the head hole. Two sets of through holes are provided on co-extrusion block one at the position corresponding to the two sets of countersunk holes of co-extrusion block two and co-extrusion block three. Three sets of countersunk bolts are respectively installed through the three sets of through holes and in the three sets of countersunk holes and the three sets of threaded holes of bracket two. Bracket four is installed at the front of co-extrusion block three. The extrusion tube is installed at the front end of bracket four, and the center of the extrusion tube is provided with a discharge hole that gradually narrows forward. The discharge hole of the extrusion tube is connected to the preform mold. Co-extrusion block one, co-extrusion block two and co-extrusion block three extrude the raw material in multiple layers synchronously through their own structure.
[0010] Preferably, the insulation layer is installed on the outer end of the co-extrusion block three, the support four, and the extrusion tube, and an electric heater is provided inside the insulation layer; the insulation layer insulates the co-extrusion device, and the electric heater of the insulation layer heats the co-extrusion device.
[0011] Preferably, the extrusion device includes three extrusion cylinders, three sliders, three hydraulic cylinders, three supports, and a support. The three extrusion cylinders are respectively installed at the top of the three supports. Each of the three extrusion cylinders has a feed inlet at its top. The front ends of the three extrusion cylinders are respectively connected to the core tube and the two extrusion tubes. The three sliders are respectively slidably installed in the three extrusion cylinders. The three hydraulic cylinders are respectively installed on the sides of the three supports. The three supports are respectively installed at the rear ends of the three hydraulic cylinders and are fixedly connected to the three sliders. The support is installed at the rear ends of the three sliders. The extrusion cylinders hold the raw material, and the hydraulic cylinders provide power to drive the sliders to move back and forth to extrude and transport the raw material inside the extrusion cylinders.
[0012] Preferably, the extrusion device includes three extrusion cylinders, three augers, three double-layer sprockets, two chains, a reducer, and a motor. The three extrusion cylinders are respectively mounted on the top of three supports. The three augers are rotatably mounted inside the three extrusion cylinders. The three double-layer sprockets are rotatably mounted at the rear end of the three augers and are fixedly connected between the three extrusion cylinders and the three augers. The two chains are sequentially mounted on the three double-layer sprockets in pairs. The reducer is fixedly mounted at the rear end of one support and is rotatably connected to one double-layer sprocket. The motor is fixedly mounted at the rear end of the reducer and provides power to one of the double-layer sprockets connected to it through the reducer. The extrusion cylinders hold the raw materials, and the motor provides power. The power is transmitted through the reducer, chains, and double-layer sprockets to drive the augers to rotate and transport the raw materials.
[0013] Compared with the prior art, the beneficial effects of this utility model are: it can make the material supply inside the flow channel uniform, prevent uneven extrusion, and improve the machine co-extrusion effect; and by extruding multiple layers of raw materials simultaneously in one place, the core material can be subjected to uniform force, prevent the core material from bending, and improve the uniformity of machine co-extrusion. Attached Figure Description
[0014] Figure 1 This is an isometric structural schematic diagram of Embodiment 1 of this utility model;
[0015] Figure 2 This is an isometric structural schematic diagram of Embodiment 2 of this utility model;
[0016] Figure 3 This is a schematic diagram of the isometric cross-sectional structure of the fuselage;
[0017] Figure 4 This is a schematic diagram of the isometric cross-sectional structure of the extrusion device;
[0018] Figure 5 This is a schematic diagram of the isometric cross-sectional structure of the co-extrusion unit;
[0019] Figure 6 This is an isometric structural diagram of the insulation layer;
[0020] Figure 7 This is an isometric structural diagram of the extrusion device in Example 1;
[0021] Figure 8 This is a schematic diagram of the isometric cross-sectional structure of the extrusion device in Example 2.
[0022] The attached diagram is labeled as follows: 01, machine body; 11, support frame one; 12, support frame two; 13, support frame three; 02, uniform extrusion device; 21, core material tube; 22, extrusion tube one; 23, extrusion tube two; 24, extrusion tube three; 03, co-extrusion device; 31, co-extrusion block one; 32, co-extrusion block two; 33, co-extrusion block three; 34, countersunk bolt; 35, support frame four; 36, extrusion tube; 04, insulation layer; 05, extrusion device; 51, extrusion cylinder one; 52, slider; 53, hydraulic cylinder; 54, support frame five; 55, support frame six; 56, extrusion cylinder two; 57, auger; 58, double-layer sprocket; 59, chain; 60, reducer; 61, motor. Detailed Implementation
[0023] To facilitate understanding of this utility model, a more complete description will be given below with reference to the accompanying drawings. This utility model can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of this utility model more thorough and complete. Example
[0024] like Figure 1 As shown, the device includes a machine body 01; it also includes a uniform extrusion device 02, a co-extrusion device 03, an insulation layer 04, and an extrusion device 05. The uniform extrusion device 02, co-extrusion device 03, and extrusion device 05 are all mounted on the machine body 01, and the insulation layer 04 is mounted on the co-extrusion device 03. The machine body 01 provides support, the uniform extrusion device 02 facilitates uniform feeding of materials to the co-extrusion device 03, the co-extrusion device 03 co-extrudes multiple raw materials, the insulation layer 04 insulates and heats the co-extrusion device 03, and the extrusion device 05 transports the raw materials.
[0025] like Figure 3 As shown, the machine body 01 includes a first bracket 11, a second bracket 12 and three third brackets 13. The first bracket 11 is installed near the blank forming mold. The second bracket 12 and the three third brackets 13 are all installed on the first bracket 11. The front end of the second bracket 12 is provided with three sets of threaded holes, mounting groove one, mounting groove two and mounting groove three.
[0026] like Figure 4 As shown, the extrusion device 02 includes a core tube 21, an extrusion tube 1 22, an extrusion tube 23, and two extrusion tubes 3 24. The core tube 21, the extrusion tube 1 22, and the extrusion tube 23 are respectively fixedly installed in the mounting groove 1, mounting groove 2, and mounting groove 3 of the bracket 2 12. The core tube 21 is located inside the extrusion tube 1 22 and the extrusion tube 23, and the extrusion tube 1 22 is located inside the extrusion tube 23. The rear part of the extrusion tube 1 22 and the extrusion tube 23 are both obliquely cut circular cylindrical structures. The interior of the extrusion tube 1 22 and the extrusion tube 23 is provided with a cavity that gradually narrows forward. The two extrusion tubes 3 24 are respectively installed at the rear end of the extrusion tube 1 22 and the extrusion tube 23.
[0027] like Figure 5 As shown, the co-extrusion device 03 includes a first co-extrusion block 31, a second co-extrusion block 32, a third co-extrusion block 33, three sets of countersunk bolts 34, a fourth bracket 35, and an extrusion tube 36. The first co-extrusion block 31, the second co-extrusion block 32, and the third co-extrusion block 33 are sequentially fastened to the front end of the second bracket 12, with the first co-extrusion block 31 located at the rear. The first co-extrusion block 31, the second co-extrusion block 32, and the third co-extrusion block 33 cooperate to form three annular flow channels converging at the front end of the third co-extrusion block 33. Each of the first co-extrusion block 31, the second co-extrusion block 32, and the third co-extrusion block 33 is provided with a set of countersunk holes, and the three sets of countersunk holes are respectively aligned with the second bracket 12. The three sets of threaded holes, a set of through holes is provided on the co-extrusion block 2 32 at the position corresponding to a set of countersunk holes of co-extrusion block 33, and two sets of through holes are provided on the co-extrusion block 1 31 at the position corresponding to two sets of countersunk holes of co-extrusion block 2 32 and co-extrusion block 33. The three sets of countersunk bolts 34 are respectively installed in the three sets of countersunk holes and the three sets of threaded holes of bracket 2 12 through the three sets of through holes. The bracket 4 35 is installed at the front of co-extrusion block 33, and the extrusion tube 36 is installed at the front end of bracket 4 35. The center of the extrusion tube 36 is provided with a discharge hole that gradually narrows forward. The discharge hole of the extrusion tube 36 is connected to the preform mold.
[0028] like Figure 6 As shown, the insulation layer 04 is installed at the outer end of the co-extrusion block 33, the support 4 35 and the extrusion tube 36, and an electric heater is provided inside the insulation layer 04;
[0029] like Figure 7 As shown, the extrusion device 05 includes three extrusion cylinders 51, three sliders 52, three hydraulic cylinders 53, three supports 54 and a support 55. The three extrusion cylinders 51 are respectively installed at the top of the three supports 53. Each of the three extrusion cylinders 51 has a feed inlet at its top. The front ends of the three extrusion cylinders 51 are respectively connected to the core tube 21 and the two extrusion tubes 24. The three sliders 52 are respectively slidably installed in the three extrusion cylinders 51. The three hydraulic cylinders 53 are respectively installed at the side ends of the three supports 53. The three supports 54 are respectively installed at the rear ends of the three hydraulic cylinders 53 and are fixedly connected to the three sliders 52. The support 6 is installed at the rear ends of the three sliders 52.
[0030] First, the raw material is filled into the extrusion cylinder 51. Then, the electric heater of the insulation layer 04 is turned on. The electric heater of the insulation layer 04 heats the co-extrusion device 03. The insulation layer 04 keeps the co-extrusion device 03 warm. Then, the hydraulic cylinder 53 is turned on. The hydraulic cylinder 53 provides power to drive the slider 52 to move back and forth to extrude and transport the raw material inside the extrusion cylinder 51. The extrusion tubes 22 and 23 make the raw material entering the interior evenly distributed in a ring shape through their own structure. The co-extrusion blocks 31, 32 and 33 extrude the raw material in multiple layers synchronously through their own structure. Example
[0031] like Figure 2 As shown, the device includes a machine body 01; it also includes a uniform extrusion device 02, a co-extrusion device 03, an insulation layer 04, and an extrusion device 05. The uniform extrusion device 02, co-extrusion device 03, and extrusion device 05 are all mounted on the machine body 01, and the insulation layer 04 is mounted on the co-extrusion device 03. The machine body 01 provides support, the uniform extrusion device 02 facilitates uniform feeding of materials to the co-extrusion device 03, the co-extrusion device 03 co-extrudes multiple raw materials, the insulation layer 04 insulates and heats the co-extrusion device 03, and the extrusion device 05 transports the raw materials.
[0032] like Figure 3 As shown, the machine body 01 includes a first bracket 11, a second bracket 12 and three third brackets 13. The first bracket 11 is installed near the blank forming mold. The second bracket 12 and the three third brackets 13 are all installed on the first bracket 11. The front end of the second bracket 12 is provided with three sets of threaded holes, mounting groove one, mounting groove two and mounting groove three.
[0033] like Figure 4 As shown, the extrusion device 02 includes a core tube 21, an extrusion tube 1 22, an extrusion tube 23, and two extrusion tubes 3 24. The core tube 21, the extrusion tube 1 22, and the extrusion tube 23 are respectively fixedly installed in the mounting groove 1, mounting groove 2, and mounting groove 3 of the bracket 2 12. The core tube 21 is located inside the extrusion tube 1 22 and the extrusion tube 23, and the extrusion tube 1 22 is located inside the extrusion tube 23. The rear part of the extrusion tube 1 22 and the extrusion tube 23 are both obliquely cut circular cylindrical structures. The interior of the extrusion tube 1 22 and the extrusion tube 23 is provided with a cavity that gradually narrows forward. The two extrusion tubes 3 24 are respectively installed at the rear end of the extrusion tube 1 22 and the extrusion tube 23.
[0034] like Figure 5As shown, the co-extrusion device 03 includes a first co-extrusion block 31, a second co-extrusion block 32, a third co-extrusion block 33, three sets of countersunk bolts 34, a fourth bracket 35, and an extrusion tube 36. The first co-extrusion block 31, the second co-extrusion block 32, and the third co-extrusion block 33 are sequentially fastened to the front end of the second bracket 12, with the first co-extrusion block 31 located at the rear. The first co-extrusion block 31, the second co-extrusion block 32, and the third co-extrusion block 33 cooperate to form three annular flow channels converging at the front end of the third co-extrusion block 33. Each of the first co-extrusion block 31, the second co-extrusion block 32, and the third co-extrusion block 33 is provided with a set of countersunk holes, and the three sets of countersunk holes are respectively aligned with the second bracket 12. The three sets of threaded holes, a set of through holes is provided on the co-extrusion block 2 32 at the position corresponding to a set of countersunk holes of co-extrusion block 33, and two sets of through holes are provided on the co-extrusion block 1 31 at the position corresponding to two sets of countersunk holes of co-extrusion block 2 32 and co-extrusion block 33. The three sets of countersunk bolts 34 are respectively installed in the three sets of countersunk holes and the three sets of threaded holes of bracket 2 12 through the three sets of through holes. The bracket 4 35 is installed at the front of co-extrusion block 33, and the extrusion tube 36 is installed at the front end of bracket 4 35. The center of the extrusion tube 36 is provided with a discharge hole that gradually narrows forward. The discharge hole of the extrusion tube 36 is connected to the preform mold.
[0035] like Figure 6 As shown, the insulation layer 04 is installed at the outer end of the co-extrusion block 33, the support 4 35 and the extrusion tube 36, and an electric heater is provided inside the insulation layer 04;
[0036] like Figure 8 As shown, the extrusion device 05 includes three extrusion cylinders 56, three augers 57, three double-layer sprockets 58, two chains 59, a reducer 60, and a motor 61. The three extrusion cylinders 56 are respectively installed at the top of three supports 13. The three augers 57 are respectively rotatably installed inside the three extrusion cylinders 56. The three double-layer sprockets 58 are respectively rotatably installed at the rear end of the three augers 57, and the three double-layer sprockets 58 are respectively fixedly connected between the three extrusion cylinders 56 and the three augers 57. The two chains 59 are sequentially installed on the three double-layer sprockets 58 in pairs. The reducer 60 is fixedly installed at the rear end of one support 13, and is rotatably connected to one double-layer sprocket 58. The motor 61 is fixedly installed at the rear end of the reducer 60, and the motor 61 provides power to one double-layer sprocket 58 connected to it through the reducer 60.
[0037] First, the raw material is filled into the extrusion cylinder 2 56. Then, the electric heater of the insulation layer 04 is turned on. The electric heater of the insulation layer 04 heats the co-extrusion device 03. The insulation layer 04 keeps the co-extrusion device 03 warm. Then, the motor 61 is turned on. The motor 61 provides power. The power is transmitted through the reducer 60, chain 59 and double-layer sprocket 58 to drive the auger 57 to rotate and transport the raw material. The extrusion tube 1 22 and extrusion tube 2 23 make the raw material inside the tube evenly distributed in a ring shape through their own structure. The co-extrusion block 1 31, co-extrusion block 2 32 and co-extrusion block 3 33 extrude the raw material in multiple layers synchronously through their own structure.
[0038] like Figures 1 to 8 As shown, this utility model discloses a multi-layer co-extrusion device for a blow molding die head. During operation, the raw material is first filled into the extrusion cylinder 2 56. Then, the electric heater of the insulation layer 04 is turned on to heat the co-extrusion device 03. The insulation layer 04 keeps the co-extrusion device 03 warm. Then, the motor 61 is turned on to provide power. The power is transmitted through the reducer 60, chain 59 and double-layer sprocket 58 to drive the auger 57 to rotate and transport the raw material. The extrusion tubes 1 22 and 23 make the raw material inside the device evenly distributed in a ring shape through their own structure. The co-extrusion blocks 1 31, 2 32 and 3 33 extrude the raw material in multiple layers synchronously through their own structure.
[0039] The three hydraulic cylinders 53, three augers 57, three double-layer sprockets 58, two chains 59, and motor 61 of this utility model are commercially available. Technical personnel in this industry only need to install and operate them according to the accompanying instruction manual, without requiring any creative work from those skilled in the art.
[0040] The main functions achieved by this utility model are as follows: by setting up the uniform extrusion device 02, the material supply inside the flow channel is made uniform, preventing uneven extrusion and improving the co-extrusion effect of the machine. Furthermore, by setting up the co-extrusion device 03, multiple layers of raw materials are extruded synchronously in one place, so that the core material is subjected to uniform force, preventing the core material from bending and improving the uniformity of machine co-extrusion. This solves the existing technical problems that when each layer is fed through only one side of the flow channel during extrusion, uneven extrusion is likely to occur, resulting in poor machine co-extrusion effect. In addition, when the existing machine is extruded, layers of plastic are sequentially wrapped and extruded on the outside of the core material, which can easily cause the core material to bend, resulting in poor machine co-extrusion uniformity.
[0041] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.
Claims
1. A multi-layer co-extrusion device for a blow molding die head, comprising a machine body (01); characterized in that, It also includes a uniform extrusion device (02), a co-extrusion device (03), an insulation layer (04), and an extrusion device (05). The uniform extrusion device (02), the co-extrusion device (03), and the extrusion device (05) are all installed on the machine body (01), and the insulation layer (04) is installed on the co-extrusion device (03). The machine body (01) provides support, the uniform extrusion device (02) facilitates uniform feeding of materials to the co-extrusion device (03), the co-extrusion device (03) co-extrudes multiple raw materials, the insulation layer (04) insulates and heats the co-extrusion device (03), and the extrusion device (05) transports the raw materials.
2. The multi-layer co-extrusion device for a blow molding die head as described in claim 1, characterized in that, The body (01) includes bracket one (11), bracket two (12) and three bracket three (13). Bracket one (11) is installed near the blank forming mold. Bracket two (12) and three bracket three (13) are all installed on bracket one (11). Bracket two (12) has three sets of threaded holes at the front end, namely mounting groove one, mounting groove two and mounting groove three.
3. The multi-layer co-extrusion device for a blow molding die head as described in claim 2, characterized in that, The extrusion device (02) includes a core tube (21), an extrusion tube one (22), an extrusion tube two (23), and two extrusion tubes three (24). The core tube (21), the extrusion tube one (22), and the extrusion tube two (23) are respectively fixedly installed in the mounting groove one, the mounting groove two, and the mounting groove three of the bracket two (12). The core tube (21) is located inside the extrusion tube one (22) and the extrusion tube two (23), and the extrusion tube one (22) is located inside the extrusion tube two (23). The rear part of the extrusion tube one (22) and the extrusion tube two (23) are both obliquely cut circular cylindrical structures. The interior of the extrusion tube one (22) and the extrusion tube two (23) is provided with a cavity that gradually narrows forward. The two extrusion tubes three (24) are respectively installed at the rear end of the extrusion tube one (22) and the extrusion tube two (23).
4. The multi-layer co-extrusion device for a blow molding die head as described in claim 2, characterized in that, The co-extrusion device (03) includes co-extrusion block one (31), co-extrusion block two (32), co-extrusion block three (33), three sets of countersunk bolts (34), support four (35), and extrusion tube (36). Co-extrusion block one (31), co-extrusion block two (32), and co-extrusion block three (33) are sequentially fastened to the front end of support two (12). Co-extrusion block one (31) is located at the rear. Co-extrusion block one (31), co-extrusion block two (32), and co-extrusion block three (33) cooperate to form three annular flow channels that converge at the front end of co-extrusion block three (33). Each of co-extrusion block one (31), co-extrusion block two (32), and co-extrusion block three (33) is provided with a set of countersunk holes. The three sets of countersunk holes are respectively aligned with the support. The three sets of threaded holes of the second bracket (12), the two sets of through holes on the co-extrusion block (32) corresponding to the countersunk holes of the third co-extrusion block (33), the two sets of through holes on the first co-extrusion block (31) corresponding to the two sets of countersunk holes of the second co-extrusion block (32) and the third co-extrusion block (33), the three sets of countersunk bolts (34) respectively pass through the three sets of through holes and are installed in the three sets of countersunk holes and the three sets of threaded holes of the second bracket (12), the fourth bracket (35) is installed at the front of the third co-extrusion block (33), the extrusion tube (36) is installed at the front end of the fourth bracket (35), and the center of the extrusion tube (36) is provided with a discharge hole that gradually narrows forward. The discharge hole of the extrusion tube (36) is connected to the preform mold.
5. The multi-layer co-extrusion device for a blow molding die head as described in claim 4, characterized in that, The insulation layer (04) is installed at the outer end of the co-extrusion block three (33), the support four (35) and the extrusion tube (36), and an electric heater is provided inside the insulation layer (04).
6. The multi-layer co-extrusion device for a blow molding die head as described in claim 3, characterized in that, The extrusion device (05) includes three extrusion cylinders (51), three sliders (52), three hydraulic cylinders (53), three supports (54) and six supports (55). The three extrusion cylinders (51) are respectively installed at the top of the three supports (13). Each of the three extrusion cylinders (51) has a feed port at its top. The front ends of the three extrusion cylinders (51) are respectively connected to the core tube (21) and the two extrusion tubes (24). The three sliders (52) are respectively slidably installed in the three extrusion cylinders (51). The three hydraulic cylinders (53) are respectively installed on the side of the three supports (13). The three supports (54) are respectively installed at the rear end of the three hydraulic cylinders (53). The three supports (54) are respectively fixedly connected to the three sliders (52). The six supports (55) are installed at the rear end of the three sliders (52).
7. The multi-layer co-extrusion device for a blow molding die head as described in claim 3, characterized in that, The extrusion device (05) includes three extrusion cylinders (56), three augers (57), three double-layer sprockets (58), two chains (59), a reducer (60), and a motor (61). The three extrusion cylinders (56) are respectively installed at the top of three supports (13). The three augers (57) are respectively rotatably installed inside the three extrusion cylinders (56). The three double-layer sprockets (58) are respectively rotatably installed at the rear end of the three augers (57), and the three double-layer sprockets (58) are respectively The three extrusion cylinders (56) and the three screw conveyors (57) are fixedly connected. Two chains (59) are installed on three double-layer sprockets (58) in pairs. The reducer (60) is fixedly installed at the rear end of a bracket (13) and is rotatably connected to a double-layer sprocket (58). The motor (61) is fixedly installed at the rear end of the reducer (60) and provides power to a double-layer sprocket (58) connected to it through the reducer (60).