Cooling device of extruder

Abstract

The invention discloses a cooling device of an extruder. The extruder comprises a machine barrel extending in the front-back direction. The cooling device comprises a plurality of cooling water jackets, a water inlet path, a water outlet path, a flow control unit and a pressure control unit, wherein the cooling water jackets sequentially sleeve the machine barrel from front to back; the water inlet path is communicated with inlets of the cooling water jackets; the water outlet path is communicated with outlets of the cooling water jackets; a cooling flow path surrounding the circumferential direction of the machine barrel is arranged in each cooling water jacket; the water inlet path is used for sequentially distributing a cooling medium to the cooling flow paths of the plurality of cooling water jackets; the flow control unit is used for adjusting the flow of the cooling medium conveyed to each cooling water jacket; the pressure control unit is configured to be capable of controlling the pressure in a cooling loop formed by sequentially communicating the water inlet path, the cooling flow path and the water outlet path; the cooling device is intensively arranged below the extruder barrel, energy loss is reduced, energy is saved, accurate temperature control is conducted on the barrel in a stable operation mode, and low-temperature extrusion is achieved.

Description

Technical Field

[0001] The present application relates to the technical field of plastic extrusion equipment, and in particular to a cooling device for an extruder. Background Art

[0002] Since most EVA film extruders on the market produce low-temperature materials, water cooling is required for precise temperature control. What is currently used in the market is to directly connect the inlet and outlet water with metal hoses, and control the inlet and outlet water volume through ball valves to achieve temperature control. This has insufficient control accuracy and is prone to water leakage, the water temperature rises quickly, the product quality is not high, and energy is wasted. Summary of the invention

[0003] In order to solve the problems of low temperature control accuracy and energy waste in the prior art, the purpose of this application is to provide a cooling device for an extruder.

[0004] To achieve the above object, the present application adopts the following technical solution: a cooling device for an extruder, the extruder comprising a barrel extending in a front-to-rear direction, the cooling device comprising: A plurality of cooling water jackets are sequentially sleeved on the barrel from front to back, each of the cooling water jackets having a cooling flow path surrounding the barrel; A water inlet path, connected to the inlets of the plurality of cooling water jackets, the water inlet path being used to sequentially distribute cooling medium to the cooling flow paths of the plurality of cooling water jackets; A flow control unit is arranged in the water inlet path, and is used to adjust the flow of the cooling medium delivered to each of the cooling water jackets; a water outlet path, communicating with outlets of the plurality of cooling water jackets; and The pressure control unit is arranged in the water inlet path, and the pressure control unit is configured to control the pressure in the cooling circuit formed by sequentially connecting the water inlet path, the cooling flow path and the water outlet path.

[0005] In the above technical solution, it is further preferred that the flow control unit includes multiple temperature detection modules, multiple solenoid valves and a controller connected to the multiple solenoid valves and the temperature detection module signals, each cooling water jacket is configured with one solenoid valve and one temperature detection module, each temperature detection module is used to detect the temperature of the barrel covered by the corresponding cooling water jacket, and the controller is configured to control the operation of the corresponding solenoid valve based on the feedback of the temperature detection module.

[0006] In the above technical solution, it is further preferred that the water inlet path includes a water inlet pipe fixed on the frame of the extruder, the water inlet pipe has a water inlet end, a water outlet end and a plurality of delivery ends arranged between the water inlet end and the water outlet end, the water inlet end and the water outlet end are both connected to a cooling source that provides the cooling medium, the plurality of delivery ends are consistent with the number of the plurality of solenoid valves, and each of the output ends is connected to the water inlet of the corresponding solenoid valve.

[0007] In the above technical solution, it is further preferred that the pressure control unit includes a pressure detecting component and a pressure regulating component, the pressure detecting component is arranged at the inlet end to detect the pressure in the cooling circuit, and the pressure regulating component is arranged at the water outlet end to regulate the pressure in the cooling circuit.

[0008] In the above technical solution, it is further preferred that the pressure regulating component is a ball valve, and the pressure detecting component is a pressure gauge.

[0009] In the above technical solution, it is further preferred that the water outlet path includes a return pipe, and the return pipe and the water inlet pipe are both stainless steel pipes.

[0010] In the above technical solution, it is further preferred that the cooling device further includes at least one pipe clamp, and the pipe clamp is configured to clamp the water inlet pipe and the water return pipe at the same time.

[0011] In the above technical solution, it is further preferred that the cooling device is arranged below the barrel.

[0012] Compared with the prior art, the present invention has the following beneficial effects: The cooling device of the present application is centrally arranged below the extruder barrel to reduce energy loss and save energy. The cooling device accurately controls the temperature of the barrel through a flow control unit to improve cooling efficiency, which is beneficial to improving the plasticization effect of the material in the barrel and realizing low-temperature extrusion, and is particularly suitable for the production of EVA film materials; the pressure control unit of the cooling device controls the fluid pressure in the cooling circuit to ensure stable operation of the cooling device. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 A schematic diagram of a structure in which a cooling device provided in an embodiment of the present application is arranged on an extruder; Figure 2 for Figure 1 A top view of the extruder in FIG. Figure 3 for Figure 1 Schematic diagram of the structure of the cooling device (excluding the cooling water jacket).

[0014] Among them: 100, extruder; 10, cooling device; 1, cooling water jacket; 2, water inlet pipe; 21, water inlet end; 22, water outlet end; 23, conveying end; 3, small water inlet pipe; 4, solenoid valve; 5, pressure gauge; 6, ball valve; 7, return pipe; 8, small return pipe; 9, pipe clamp; 20, barrel. DETAILED DESCRIPTION

[0015] To describe the technical content, structural features, achieved purpose and effect of the application in detail, the technical solutions in the embodiments of the application will be described below in conjunction with the drawings in the embodiments of the application. Obviously, the described embodiments are only a part of the embodiments of the application, rather than all of the embodiments. In the following description, for the purpose of explanation, many specific details are set forth to provide a detailed description of various exemplary embodiments or implementations of the invention. However, various exemplary embodiments may also be implemented without these specific details or in the case of one or more equivalent arrangements. In addition, various exemplary embodiments may be different, but not necessarily exclusive. For example, without departing from the inventive concept, the specific shape, structure and characteristics of the exemplary embodiment may be used or implemented in another exemplary embodiment.

[0016] In the following, the terms "first", "second", etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of this application, unless otherwise specified, "plurality" means two or more.

[0017] The terms “front”, “back”, “upper” and “lower” in this application refer to the attached Figure 1 Front, back, top and bottom shown.

[0018] In the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0019] The present application embodiment provides a cooling device for an extruder. During the production process of EVA film, the temperature of the barrel of the extruder is controlled by the cooling device, so that the extruder extrude low-temperature EVA film production materials; Figure 1 , 2 As shown, the cooling device 10 is installed on the barrel 20 of the extruder 100, and is used to reduce the temperature at the barrel 20 to prevent the temperature in the barrel 20 from being too high during the production process of the extruder 100, thereby affecting the plasticization effect of the material. The cooling device 10 is arranged below the barrel 20, close to the barrel 20, to reduce the energy loss during the transportation of the cooling medium and improve the cooling efficiency.

[0020] like Figure 1 , 3 As shown, the cooling device 10 includes multiple cooling water jackets 1, a water inlet path, a flow control unit, a water outlet path and a pressure control unit. The water inlet path, the multiple cooling water jackets 1 and the water outlet path are fluidically connected in sequence to form a cooling circuit for reducing the temperature of the barrel 20.

[0021] like Figure 1 , 2 As shown, a plurality of cooling water jackets 1 are sequentially mounted on the barrel 20 from front to back, and each cooling water jacket 1 has a cooling flow path surrounding the barrel 20 in a circumferential direction, and the cooling flow path has an inlet for inputting a cooling medium and an outlet for outputting the cooling medium. The cooling medium enters the cooling flow path from the inlet and exchanges heat with the barrel 20 in the corresponding area. After the heat exchange, the cooling medium takes away the heat of the barrel in the area from the outlet, thereby achieving the purpose of cooling the barrel 20.

[0022] The water inlet path fluid is connected between a cooling source providing cooling medium and the inlets of multiple cooling water jackets 1, and is used to distribute the cooling medium provided by the cooling source to the cooling flow paths of each cooling water jacket 1 in sequence. The water inlet path includes a water inlet pipe 2 and multiple water inlet small tubes 3. The number of water inlet small tubes 3 is consistent with the number of cooling water jackets 1, and the inlet of each cooling water jacket 1 is connected to a water inlet small tube 3. The water inlet pipe 2 has a water inlet end 21, a water outlet end 22, and a plurality of delivery ends 23 arranged between the water inlet end 21 and the water outlet end 22. The water inlet end 21 and the water outlet end 22 are both connected to the cooling source fluid. The number of the delivery ends 23 is consistent with the number of cooling water jackets 1. Each delivery end 23 is connected to a water inlet small tube 3, so that the cooling medium in the water inlet pipe 2 can be delivered to each cooling water jacket 1.

[0023] like Figure 1 , 3As shown, the flow control unit is arranged in the water inlet path, and is fluidly connected to the water inlet pipe 2 and the plurality of water inlet small tubes 3, respectively. The flow control unit is used to control the flow of the cooling medium delivered to each cooling water jacket 1 by the water inlet pipe 2. The flow control unit includes a plurality of solenoid valves 4 and a controller (not shown in the figure) connected to the signals of the plurality of solenoid valves 4. The number of the solenoid valves 4 is consistent with the number of the cooling water jackets 1. Each solenoid valve 4 is connected between a delivery end 23 and a water inlet small tube 3, and the flow of the cooling medium delivered to the corresponding cooling water jacket 1 is controlled by the degree of opening of the internal valve core. A temperature detection module (not shown in the figure) is provided on the barrel of each area corresponding to the cooling water jacket 1. The temperature detection module is used to test the temperature of the barrel in the area. The temperature detection module is connected to the controller signal. The controller is configured to control the opening degree of the valve core of the corresponding solenoid valve 4 according to the feedback of each temperature detection module. When the temperature detection module detects that the temperature of the corresponding barrel area is high, the controller controls the valve core of the solenoid valve 4 to open more, so that the flow rate of the cooling medium delivered to the corresponding cooling water jacket 1 is large, which can quickly reduce the temperature of the barrel in the area. When the temperature of the barrel in the area drops to a suitable range, the corresponding solenoid valve 4 is closed, and the solenoid valve 4 stops delivering the cooling medium to the cooling water jacket 1. The flow control unit accurately controls the temperature of the barrel through each solenoid valve 4 and the corresponding temperature detection module on the barrel, improves the efficiency of cooling and cooling, and realizes low-temperature extrusion after the material is fully plasticized.

[0024] The water inlet end 21 of the water inlet pipe 2 is provided with a pressure detection component of the pressure control unit, and the water outlet end 22 is provided with a pressure regulating component of the pressure control unit. In the embodiment of the present application, the pressure detection component is a pressure gauge 5, and the pressure regulating component is a ball valve 6. The pressure gauge 5 is used to detect the pressure in the cooling circuit and display the current pressure in the cooling circuit through a visual dial; the ball valve 6 is arranged between the water outlet end 22 and the cooling source, and is used to control the connection between the water outlet end 22 and the cooling source, thereby regulating the pressure in the cooling circuit. Since the cooling device is arranged below the barrel 20, the water inlet pipe 2 needs to be filled with cooling medium, and when the solenoid valve 4 is opened, the pressure of the cooling medium delivered to the cooling water jacket 1 is given. When the barrel 20 needs to be cooled, the ball valve 6 is closed, and when the water inlet pipe 2 is filled with cooling medium, the solenoid valve 4 is opened under the control of the controller, and each solenoid valve 4 allows the cooling medium to be transported to the corresponding cooling water jacket 1. The operator observes the pressure gauge 5 to adjust the size of the ball valve 6 switch. When the pressure gauge 5 shows a high pressure, the ball valve 6 is opened to reduce the pressure in the cooling circuit to a suitable range. When the pressure gauge 5 shows a low pressure, the ball valve 6 is closed to increase the pressure in the cooling circuit to a suitable range. The operator controls the fluid pressure in the cooling circuit through the pressure control unit arranged in the water inlet path, so that the cooling device 10 can transport the cooling medium with stable pressure.

[0025] The water outlet path is connected between the outlets of the multiple cooling water jackets 1 and the external cooling pool. The water outlet path transports the cooling medium carrying the heat of the barrel output by the multiple cooling water jackets 1 to the cooling pool, and after the heat in the output cooling medium is released, the cooling medium is transported back to the cooling source for recycling. The water outlet path includes a return pipe 7 and multiple return small pipes 8. The return pipe 7 is connected to the external cooling pool. The multiple return small pipes 8 are respectively connected to the multiple cooling water jackets 1. Each return small pipe 8 is fluidically connected to the outlet of the corresponding cooling water jacket 1 and the return pipe 7. The return pipe 7 uniformly receives the cooling medium output by the multiple cooling water jackets 1. The return water pipe 7 and the water inlet pipe 2 are both stainless steel pipes, and the water inlet pipe 3 and the return water pipe 8 are copper pipes. Each water inlet pipe 3 is connected between the corresponding cooling water jacket 1 and the solenoid valve 4, and the water inlet pipe 2 provides cooling medium to multiple solenoid valves 4 in a unified manner; the return water pipe 8 transports the cooling medium output by multiple cooling water jackets 1 to the return water pipe 7, and the return water pipe 7 uniformly receives and transports the cooling medium carrying heat, so that the cooling circuit structure of the entire cooling device 10 is simple, the layout is beautiful and orderly, and the probability of water leakage is reduced.

[0026] The cooling device 10 also includes a pipe clamp 9 for clamping the water inlet pipe 2 and the water return pipe 7. The pipe clamp 9 can clamp the water return pipe 7 and the water inlet pipe 2 at the same time, and fix the water return pipe 7 and the water inlet pipe 2 on the frame of the extruder to avoid pipeline vibration during the transportation of the cooling medium, improve the operating stability of the cooling device 10, and reduce noise.

[0027] The cooling device 10 of the present application is centrally arranged below the extruder barrel to reduce energy loss and save energy. The cooling device accurately controls the temperature of the barrel through a flow control unit to improve cooling efficiency, which is beneficial to improving the plasticization effect of the material in the barrel and realizing low-temperature extrusion, and is particularly suitable for the production of EVA film materials; the pressure control unit of the cooling device controls the fluid pressure in the cooling circuit to ensure stable operation of the cooling device.

[0028] The above shows and describes the basic principles, main features and advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present application. Without departing from the spirit and scope of the present application, the present application may have various changes and improvements, and the scope of protection required by the present application is defined by the attached claims, description and their equivalents.

Claims

1. A cooling device for an extruder, the extruder comprising a barrel extending in a front-to-rear direction, characterized in that: The cooling device comprises: A plurality of cooling water jackets are sequentially sleeved on the barrel from front to back, each of the cooling water jackets having a cooling flow path surrounding the barrel; A water inlet path, connected to the inlets of the plurality of cooling water jackets, the water inlet path being used to sequentially distribute cooling medium to the cooling flow paths of the plurality of cooling water jackets; A flow control unit is arranged in the water inlet path, and is used to adjust the flow of the cooling medium delivered to each of the cooling water jackets; a water outlet path, communicating with outlets of the plurality of cooling water jackets; and The pressure control unit is arranged in the water inlet path, and the pressure control unit is configured to control the pressure in the cooling circuit formed by sequentially connecting the water inlet path, the cooling flow path and the water outlet path.

2. The cooling device according to claim 1, characterized in that: The flow control unit includes multiple temperature detection modules, multiple solenoid valves and a controller connected to the multiple solenoid valves and the temperature detection modules by signal. Each cooling water jacket is equipped with one solenoid valve and one temperature detection module. Each temperature detection module is used to detect the temperature of the barrel covered by the corresponding cooling water jacket. The controller is configured to control the operation of the corresponding solenoid valve based on feedback from the temperature detection module.

3. The cooling device according to claim 2, characterized in that: The water inlet path includes a water inlet pipe fixed on the frame of the extruder, the water inlet pipe has a water inlet end, a water outlet end and a plurality of delivery ends arranged between the water inlet end and the water outlet end, the water inlet end and the water outlet end are both connected to a cooling source that provides the cooling medium, the plurality of delivery ends are consistent with the number of the plurality of solenoid valves, and each of the output ends is connected to the water inlet of the corresponding solenoid valve.

4. The cooling device according to claim 3, characterized in that: The pressure control unit includes a pressure detection component and a pressure regulating component. The pressure detection component is arranged at the inlet end to detect the pressure in the cooling circuit, and the pressure regulating component is arranged at the water outlet end to regulate the pressure in the cooling circuit.

5. The cooling device according to claim 4, characterized in that: The pressure regulating component is a ball valve, and the pressure detecting component is a pressure gauge.

6. The cooling device according to claim 3, characterized in that: The water outlet path includes a return pipe, and both the return pipe and the water inlet pipe are stainless steel pipes.

7. The cooling device according to claim 6, characterized in that: The cooling device further comprises at least one pipe clamp, and the pipe clamp is configured to clamp the water inlet pipe and the water return pipe at the same time.

8. The cooling device according to claim 1, characterized in that: The cooling device is arranged below the barrel.

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