Temperature control device of extruder

Abstract

The utility model relates to the technical field of extruders, in particular to a temperature control device of an extruder, which comprises a screw cylinder, a screw positioned in the screw cylinder and a transmission system positioned at one end of the screw cylinder, at least one temperature control unit is arranged on the screw cylinder, and the temperature control unit comprises an electric heating tube spirally distributed on the outer wall of the screw cylinder. The electric heating tube is provided with a fluid channel, the fluid channel is filled with heat conduction liquid, one end of the electric heating tube is a fluid discharge end, the other end of the electric heating tube is a fluid inlet end, and a fluid circulation cooling assembly is installed between the fluid discharge end and the fluid inlet end in a communicated mode. Due to the fact that the electric heating pipe not only has the heating function, but also has the cooling function, the electric heating pipe can be regarded as a heating assembly integrally distributed outside the screw barrel, and can also be regarded as a cooling assembly integrally distributed outside the screw barrel. The device is higher in heating and cooling efficiency and more uniform in heating and cooling.

Description

Technical Field

[0001] The utility model relates to the technical field of extruders, in particular to a temperature control device for an extruder. Background Art

[0002] Extruder is a common equipment in plastic processing. Its internal structure usually includes the following main components: Screw: The screw is one of the core components of the extruder. It is located in the screw barrel of the extruder. Its function is to transport the plastic raw materials from the feed port to the extrusion port, and heat, plasticize, mix and extrude the plastic raw materials through rotation and pushing. Screw barrel: The screw barrel is the outer shell where the screw is located, usually composed of a heating and cooling system. The heating system can provide heat through an electric heating coil to heat the plastic raw materials to a molten state; while the cooling system is used to control the temperature during the extrusion process to ensure that the plastic raw materials are processed within the appropriate temperature range. Feed port: The feed port is located at the top of the extruder and is used to load the plastic raw materials. There is usually a feeding mechanism to ensure that the plastic raw materials are continuously supplied to the inside of the screw. Die head: The die head is located at the discharge port of the extruder and is used to shape the plastic raw materials. The design of the die head will affect the shape and size of the final extruded plastic product.

[0003] In the prior art, the electric heating coil and the cooling water pipe will be wrapped around the screw barrel in one or more circles, and the two are staggered. Since the electric heating coil and the cooling water pipe are alternately wound and distributed, the electric heating coil occupies half of the total size of the screw barrel, and the cooling water pipe occupies half of the total size of the screw barrel. This arrangement method causes the heating area to occupy half and the cooling area to occupy half, which ultimately leads to slow heating and cooling. At the same time, due to the alternating winding of hot and cold, the heat distribution of the screw barrel is uneven and the cooling is also uneven. Utility Model Content

[0004] The utility model aims to solve the shortcomings of the prior art that the extruder heats up and cools down slowly, and that the heat distribution and cooling of the screw barrel are uneven due to the alternating winding of hot and cold, and proposes a temperature control device for the extruder.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A temperature control device for an extruder comprises a screw barrel, a screw located in the screw barrel, and a transmission system located at one end of the screw barrel, wherein at least one temperature control unit is provided on the screw barrel, and the temperature control unit comprises an electric heating tube spirally distributed on the outer wall of the screw barrel, wherein the electric heating tube has a fluid channel filled with a heat transfer fluid, wherein one end of the electric heating tube is a fluid discharge end and the other end is a fluid inlet end, and a fluid circulation cooling component is installed and connected between the fluid discharge end and the fluid inlet end.

[0007] The electric heating tube comprises a tube substrate, an electric heating film layer is arranged on the outer wall of the tube substrate, at least two electrode layers are arranged on the electric heating film layer at intervals along the fluid movement direction, and the plurality of electrode layers are connected to a power source.

[0008] The radial cross section of the tube base is circular.

[0009] The radial cross section of the tube substrate is rectangular, and the electric heating film layer is arranged on at least one side of the tube substrate.

[0010] A heat-insulating layer is coated between the outside of the electric heating tube and the outer wall of the screw barrel.

[0011] The fluid circulation cooling component includes a fluid circulation pump and a heat dissipation component. The fluid discharge end is connected to the heat dissipation component inlet end, the heat dissipation component discharge end is connected to the fluid circulation pump inlet end, and the fluid circulation pump discharge end is connected to the fluid inlet end.

[0012] The heat dissipation assembly includes a first header, a second header, and a plurality of heat dissipation tubes installed between the first header and the second header. A fan is installed on one side of the heat dissipation tube. The fluid discharge end is connected to the second header, and the fluid circulation pump inlet end is connected to the first header.

[0013] The screw barrel is provided with three temperature control units.

[0014] The utility model proposes an extruder temperature control device, which has the beneficial effect that: since the electric heating tube has both the heating function and the cooling function, the electric heating tube can be regarded as a heating component distributed as a whole outside the screw barrel, and can also be regarded as a cooling component distributed as a whole outside the screw barrel. Compared with the traditional setting of half heating component and half cooling component, the heating and cooling efficiency of the device is higher, and the heating and cooling are also more uniform. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural schematic diagram of the utility model;

[0016] Figure 2 This is a schematic diagram of the straightening structure of the electric heating tube of the utility model;

[0017] Figure 3 This is a schematic diagram of the radial cross-section structure of the first embodiment of the electric heating tube of the utility model;

[0018] Figure 4 It is a schematic diagram of the radial cross-section structure of the second embodiment of the electric heating tube of the utility model.

[0019] In the figure: transmission system 1, screw barrel 2, screw 3, temperature control unit 4, insulation layer 5, electric heating pipe 6, fluid inlet end 7, fluid circulation pump 8, first collecting pipe 9, heat dissipation pipe 10, fan 11, second collecting pipe 12, fluid discharge end 13, heat dissipation component 14, tube matrix 15, electric heating film layer 16, electrode layer 17, fluid channel 18. DETAILED DESCRIPTION

[0020] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0021] Reference Figure 1-4 A temperature control device for an extruder includes a screw barrel 2, a screw 3 located in the screw barrel 2, and a transmission system 1 located at one end of the screw barrel 2. At least one temperature control unit 4 is provided on the screw barrel 2. The temperature control unit 4 includes an electric heating tube 6 spirally distributed on the outer wall of the screw barrel 2. The electric heating tube 6 has a fluid channel 18, and the fluid channel is filled with a heat transfer liquid, such as heat transfer oil. One end of the electric heating tube 6 is a fluid discharge end 13, and the other end is a fluid inlet end 7. A fluid circulation cooling component is installed between the fluid discharge end 13 and the fluid inlet end 7.

[0022] When the device is working, the electric heating tube 6 is energized to make the electric heating tube 6 generate heat, the heat transfer fluid is in a stationary state, and the electric heating tube heats the screw barrel 2. When cooling is required, the heat transfer fluid is circulated in the electric heating tube 6 through the fluid circulation cooling component, and the flow speed and cooling speed of the heat transfer fluid are controlled by the fluid circulation cooling component. If the flow speed of the heat transfer fluid is fast and the cooling speed is fast, the screw barrel in the area wrapped by the electric heating tube 6 can be quickly cooled; if the flow speed of the heat transfer fluid is slow and the cooling speed is slow, the screw barrel in the area wrapped by the electric heating tube 6 can be slowly cooled.

[0023] Since the electric heating tube 6 has both the function of heating and the function of cooling, the electric heating tube 6 can be regarded as a heating component distributed as a whole outside the screw barrel, or as a cooling component distributed as a whole outside the screw barrel. Compared with the traditional setting of half heating component and half cooling component, the heating and cooling efficiency of this device is higher, and the heating and cooling are also more uniform.

[0024] refer to Figure 2 The electric heating tube 6 includes a tube substrate 15, and an electric heating film layer 16 is provided on the outer wall of the tube substrate 15. Along the direction of fluid movement, at least two electrode layers 17 are spaced apart on the electric heating film layer 16. The multiple electrode layers 17 are connected to a power supply. By energizing the electrode layers 17, the electric heating film layer 16 is heated, and the tube substrate 15 is heated. The electric heating film layer 16 uses a nano electric heating film in the prior art, and the electrode layer uses a silver electrode layer.

[0025] refer to Figure 3 The radial cross section of the tube base 15 is circular.

[0026] Preferably, reference Figure 4 The radial cross section of the tube substrate 15 is rectangular, and the electric heating film layer 16 is arranged on at least one side of the tube substrate 15 to increase the contact surface between the tube substrate 15 and the screw barrel and improve the heat conduction effect.

[0027] Furthermore, a heat-insulating layer 5 is coated between the outside of the electric heating tube 6 and the outer wall of the screw barrel 2 .

[0028] As an implementation method, refer to Figure 1 The fluid circulation cooling component includes a fluid circulation pump 8 and a heat dissipation component 14. The fluid discharge end 13 is connected to the entrance end of the heat dissipation component 14, the discharge end of the heat dissipation component 14 is connected to the entrance end of the fluid circulation pump 8, and the discharge end of the fluid circulation pump 8 is connected to the fluid entrance end 7. The heat transfer fluid is driven to circulate between the electric heating pipe 6 and the heat dissipation component 14 through the fluid circulation pump 8. If the power of the heat dissipation component 14 is large and the power of the fluid circulation pump 8 is large, then the circulation speed of the heat transfer fluid is fast, the cooling speed is fast, and the screw barrel cooling speed is fast. If the power of the heat dissipation component 14 is small and the power of the fluid circulation pump 8 is small, then the circulation speed of the heat transfer fluid is slow, the cooling speed is slow, and the screw barrel cooling speed is slow.

[0029] Among them, the heat dissipation component 14 includes a first collecting pipe 9, a second collecting pipe 12, and a plurality of heat dissipation pipes 10 installed at intervals between the first collecting pipe 9 and the second collecting pipe 12. Preferably, the heat dissipation pipe 10 is a copper flat tube or an aluminum flat tube. A fan 11 is installed on one side of the heat dissipation pipe 10, the fluid discharge end 13 is connected to the second collecting pipe 12, and the inlet end of the fluid circulation pump 8 is connected to the first collecting pipe 9. The cooling efficiency of the heat dissipation component 14 is controlled by controlling the power of the fan 11.

[0030] As an implementation mode, three temperature control units 4 are provided on the screw barrel 2, one is set in the solid conveying zone of the screw barrel 2, one is set in the melting zone of the screw barrel 2, and one is set in the melt conveying zone of the screw barrel 2, and the three zones have three different working temperatures.

[0031] The above is only a preferred specific implementation method of the utility model, but the protection scope of the utility model is not limited thereto. Any technical solution, concept, and design obtained by equivalent replacement or change based on the technical solution and utility model concept of the utility model by any technician familiar with the technical field within the technical scope disclosed by the utility model should be included in the protection scope of the utility model.

Claims

1. A temperature control device for an extruder, comprising a screw barrel (2), a screw (3) located in the screw barrel (2), and a transmission system (1) located at one end of the screw barrel (2), wherein at least one temperature control unit (4) is provided on the screw barrel (2), characterized in that: The temperature control unit (4) comprises an electric heating tube (6) spirally distributed on the outer wall of the screw barrel (2), the electric heating tube (6) having a fluid channel (18), the fluid channel being filled with a heat transfer fluid, one end of the electric heating tube (6) being a fluid discharge end (13), and the other end being a fluid inlet end (7), and a fluid circulation cooling component being connected and installed between the fluid discharge end (13) and the fluid inlet end (7).

2. An extruder temperature control device according to claim 1, characterized in that: The electric heating tube (6) comprises a tube substrate (15), an electric heating film layer (16) is provided on the outer wall of the tube substrate (15), and at least two electrode layers (17) are provided on the electric heating film layer (16) at intervals along the direction of fluid movement, and the plurality of electrode layers (17) are connected to a power source.

3. An extruder temperature control device according to claim 2, characterized in that: The radial cross section of the tube base (15) is circular.

4. The extruder temperature control device according to claim 2, characterized in that: The radial cross section of the tube substrate (15) is rectangular, and the electric heating film layer (16) is arranged on at least one side of the tube substrate (15).

5. The extruder temperature control device according to claim 2, characterized in that: A heat-insulating layer (5) is coated between the outside of the electric heating tube (6) and the outer wall of the screw barrel (2).

6. An extruder temperature control device according to any one of claims 1 to 5, characterized in that: The fluid circulation cooling component comprises a fluid circulation pump (8) and a heat dissipation component (14); the fluid discharge end (13) is connected to the heat dissipation component (14) inlet end; the heat dissipation component (14) discharge end is connected to the fluid circulation pump (8) inlet end; and the fluid circulation pump (8) discharge end is connected to the fluid inlet end (7).

7. An extruder temperature control device according to claim 6, characterized in that: The heat dissipation assembly (14) comprises a first header (9), a second header (12), and a plurality of heat dissipation pipes (10) installed between the first header (9) and the second header (12) at intervals; a fan (11) is installed on one side of the heat dissipation pipe (10); the fluid discharge end (13) is connected to the second header (12); and the fluid circulation pump (8) inlet end is connected to the first header (9).

8. An extruder temperature control device according to any one of claims 1-5 and 7, characterized in that: The screw barrel (2) is provided with three temperature control units (4).

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