Double screw extruder external cooling water circulating device for wood plastic additive

Abstract

The utility model belongs to extrusion part cooling device technical field especially relates to wood -plastic additive is with double screw extruder external cooling water circulating device, including heat absorption subassembly, cooling assembly and pipeline subassembly, heat absorption subassembly includes water tank, spiral pipe and shower nozzle, the water tank is located extruder's machine head below, has the cavity of containing extrusion test piece and cooling water, spiral pipe is around and is located extruder's machine head outer wall, the shower nozzle is located the top of water tank and is towards extrusion test piece. This application carries out twice cooling and temperature reduction before and after extrusion test piece cutting, realizes the efficient cooling of extruder machine head and extrusion test piece, and the cooling water that exchanges heat through cooling assembly sprays directly through pipeline subassembly from the shower nozzle, guarantees that extrusion test piece can contact with low temperature cooling water, on one hand reduces the temperature requirement of cooling water in water tank, on the other hand through reducing the soaking cooling length in water tank, adapts the extrusion working condition of high torque, high speed's double screw extruder.

Description

Technical Field

[0001] This utility model belongs to the technical field of extrusion cooling devices, and particularly relates to an external cooling water circulation device for a twin-screw extruder for wood-plastic additives. Background Technology

[0002] Twin-screw extruders are widely used in polymer material processing, food, and chemical industries, primarily for material mixing, plasticizing, reaction, and extrusion molding. In the extrusion molding process of wood-plastic composites, the molten material needs rapid cooling and shaping after being extruded through the die. Current technology uses cooling water from a water tank at the extruder head to immerse the extruded specimen for cooling and shaping. However, the cooling water in the tank is prone to uneven temperature distribution due to poor circulation, making it difficult to meet the critical shaping temperature requirements of wood-plastic materials. Utility Model Content

[0003] The purpose of this invention is to provide an external cooling water circulation device for a twin-screw extruder for wood-plastic additives, aiming to solve the technical problems in the prior art.

[0004] To achieve the above objectives, the present invention provides an external cooling water circulation device for a twin-screw extruder used for wood-plastic additives, comprising a heat-absorbing component, a cooling component, and a pipeline component. The heat-absorbing component includes a water tank, a spiral tube, and a spray head. The water tank is located below the extruder head and has a cavity for accommodating the extruded specimen and cooling water. The spiral tube and the spray head are respectively connected to the cooling component through the pipeline component to achieve water circulation. The spiral tube is wound around the outer wall of the extruder head, and the spray head is located above the water tank and faces the extruded specimen.

[0005] Optionally, the piping assembly includes a water supply pipe, a return pipe, and a water pump. The inlet end of the water supply pipe is connected to the cooling assembly via the water pump, and the outlet end is provided with a first connector and a second connector. The spiral pipe includes an inlet section, a spiral section, and a drain section. The spiral section fits tightly against the outer wall of the extruder head. One end of the inlet section is connected to the first connector, and the other end is connected to the spiral section. One end of the drain section is connected to the spiral section, and the other end is suspended above the cavity for drainage. A support rod is provided on the water tank, and the water supply pipe is fixed to the upper side of the water tank via the support rod. The spray head is provided with a spray pipe connected to the second connector and suspended above the water tank via the support rod. A third connector is provided at the end of the water tank away from the extruder, and one end of the return pipe is connected to the third connector, and the other end is connected to the cooling assembly.

[0006] Optionally, the cooling assembly includes a cooler, a cooling tower, a collection pipe, and a water supply pipe. The cooler is provided with a first water inlet, a first water outlet, a second water inlet, and a second water outlet. The return water pipe is connected to the first water inlet, and the supply water pipe is connected to the first water outlet. The water inlet of the cooling tower is connected to the second water outlet through the collection pipe, and the water outlet is connected to the second water inlet through the supply water pipe.

[0007] Optionally, it also includes a controller, a temperature sensor disposed on the water supply pipe, and an electric regulating valve disposed on the water supply pipe. The probe of the temperature sensor extends into the inner hole of the water supply pipe to monitor the temperature of the cooling water in real time and transmit the temperature information to the controller. The electric regulating valve is electrically connected to a power source through the controller and is used to control the flow rate of the cooling water.

[0008] Optionally, the spiral tube is made of 316L stainless steel or a copper-nickel alloy.

[0009] Optionally, the piping assembly is made of high-temperature resistant silicone tubing or PVDF rigid tubing.

[0010] Optionally, it also includes a water filtration assembly, which is disposed on the water tank and separates the cavity into a cooling chamber and a purification chamber, wherein the purification chamber is connected to the return water pipe through the third connector.

[0011] Optionally, the water filtration assembly includes an assembly frame, the outer side of which is detachably connected to the water tank, and the inner side of which has a water-passing hollow trough. A filter screen and a reverse osmosis membrane are provided on one side of the water-passing hollow trough along the water flow direction.

[0012] Optionally, a filling cavity is provided between the filter screen and the reverse osmosis membrane, and activated carbon is provided in the filling cavity.

[0013] Optionally, the bottom wall of the cavity is recessed inward and provided with a slot, and the bottom of the assembly frame is protruding outward and provided with a plug that matches the slot.

[0014] The above-mentioned one or more technical solutions in the external cooling water circulation device for a twin-screw extruder for wood-plastic additives provided in this utility model embodiment have at least one of the following technical effects: when the material is located at the extruder head, the material in the head is cooled for the first time by the cooling water in the spiral tube; when the material is extruded and exposed between the head and the water tank, cooling water is sprayed by the spray head, and the cooling water and the extruded specimen are cooled for the second time; finally, the specimen is extruded after the head is cut off and falls into the water tank. Compared with the prior art, this application performs two cooling and temperature reductions before and after the extruded specimen is cut off, achieving efficient cooling of the extruder head and the extruded specimen. The cooling water that has been heated by the cooling component is sprayed directly from the spray head through the pipe assembly, ensuring that the extruded specimen can contact the low-temperature cooling water. On the one hand, it reduces the temperature requirement of the cooling water in the water tank, and on the other hand, it reduces the immersion cooling time in the water tank to adapt to the extrusion conditions of the high-torque, high-speed twin-screw extruder. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the external cooling water circulation device of the twin-screw extruder for wood-plastic additives provided in this embodiment of the utility model.

[0017] Figure 2 for Figure 1 A magnified view of a portion of point A in the middle.

[0018] Figure 3 for Figure 1 A magnified view of a section at point B in the middle.

[0019] The following are the labeling elements in the figure:

[0020] 1—Heat-absorbing component; 11—Water tank; 111—Cavity

[0021] 1111—Cooling chamber; 1112—Purification chamber; 1113—Slot

[0022] 112—Support rod; 12—Spiral pipe; 121—Inlet section

[0023] 122—Spiral section; 123—Drainage section; 13—Spray head

[0024] 2—Cooling assembly 21—Cooler 211—First water inlet

[0025] 212—First water outlet; 213—Second water inlet; 214—Second water outlet

[0026] 22—Cooling tower; 23—Collection pipe; 24—Water supply pipe

[0027] 3—Pipeline assembly 31—Water supply pipe 311—First connector

[0028] 312—Second connector; 32—Return water pipe; 33—Water pump

[0029] 4—Extruder 5—Extruded specimen 6—Temperature sensor

[0030] 7—Electric regulating valve; 8—Water filter assembly; 81—Assembly frame

[0031] 811—Water-passing hollow tank; 812—Filter screen; 813—Reverse osmosis membrane

[0032] 814—Activated carbon; 815—Insertion block. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0037] In one embodiment of this utility model, such as Figures 1-3 As shown, an external cooling water circulation device for a twin-screw extruder for wood-plastic additives is provided, including a heat absorption component 1, a cooling component 2, and a pipeline component 3. The heat absorption component 1 includes a water tank 11, a spiral tube 12, and a spray head 13. The water tank 11 is located below the extruder head 4 and has a cavity 111 for accommodating the extruded specimen 5 and cooling water. The spiral tube 12 and the spray head 13 are respectively connected to the cooling component 2 through the pipeline component 3 to achieve water circulation. The spiral tube 12 is wound around the outer wall of the extruder head 4, and the spray head 13 is located above the water tank 11 and faces the extruded specimen 5. Specifically, when the material is located at the die head of the extruder 4, the material in the die head is cooled for the first time using the cooling water in the spiral tube 12. When the material is extruded and exposed between the die head and the water tank 11, cooling water is sprayed using the spray nozzle 13. The cooling water and the extruded specimen 5 are cooled for the second time. Finally, the specimen 5 is extruded from the cut end of the die head and falls into the water tank 11. In this embodiment, the extruded specimen 5 is cooled twice before and after being cut, so as to achieve efficient cooling of the die head of the extruder 4 and the extruded specimen 5. The cooling water that has been heated by the cooling component 2 is sprayed directly from the spray nozzle 13 through the pipe assembly to ensure that the extruded specimen 5 can come into contact with the low temperature cooling water. On the one hand, this reduces the temperature requirement of the cooling water in the water tank 11, and on the other hand, it reduces the immersion cooling time in the water tank 11 to adapt to the extrusion conditions of the high torque and high speed twin-screw extruder 4.

[0038] In one embodiment of this utility model, such as Figures 1-2As shown, the pipeline assembly 3 includes a water supply pipe 31, a return water pipe 32, and a water pump 33. The inlet end of the water supply pipe 31 is connected to the cooling assembly 2 via the water pump 33, and the outlet end is provided with a first connector 311 and a second connector 312. The spiral pipe 12 includes an inlet section 121, a spiral section 122, and a drain section 123. The spiral section 122 fits tightly against the outer wall of the machine head. One end of the inlet section 121 is connected to the first connector 311, and the other end is connected to the spiral section 122. One end of the drain section 123 is connected to the spiral section 312. The swivel section 122 is connected, and the other end is suspended above the cavity 111 for drainage; the water tank 11 is provided with a support rod 112, and the water supply pipe 31 is fixed to the upper side of the water tank 11 through the support rod 112; the spray head 13 is provided with a spray pipe connected to the second connector 312 and is suspended above the water tank 11 through the support rod 112; the water tank 11 is provided with a third connector at the end away from the extruder 4, and one end of the return water pipe 32 is connected to the third connector and the other end is connected to the cooling assembly 2. Specifically, the spiral section 122 is used to increase the contact area with the outside of the extruder head 4, thereby increasing the heat absorption area and improving the cooling effect. After absorbing heat, the cooling water in the spiral section 122 flows into the water tank 11 through the drain section 123. The spray head 13 uses an atomizing nozzle to atomize the cooling water in the spray pipe, thereby increasing the contact area between the coolant and the extruded specimen 5, thus enhancing evaporative heat dissipation. The sprayed liquid mist falls into the water tank 11. The cooling water in the water tank 11 that has absorbed heat flows back to the cooling component 2 through the return water pipe 32 for heat exchange. The low-temperature cooling water after heat exchange is pumped to the water supply pipe 31 by the water pump 33 to realize the circulation of cold water. In this embodiment, the bottom end of the support rod 112 is connected to a base plate, and the top end is connected to a clamp that clamps the water supply pipe 31. The base plate spans the top of the water tank 11.

[0039] In one embodiment of this utility model, such as Figure 1As shown, the cooling assembly 2 includes a cooler 21, a cooling tower 22, a collection pipe 23, and a water supply pipe 24. The cooler 21 has a first water inlet 211, a first water outlet 212, a second water inlet 213, and a second water outlet 214. The return water pipe 32 is connected to the first water inlet 211, and the supply water pipe 31 is connected to the first water outlet 212. The water inlet of the cooling tower 22 is connected to the second water outlet 214 through the collection pipe 23, and the water outlet is connected to the second water inlet 213 through the supply water pipe 24. It also includes a controller, a temperature sensor 6 mounted on the supply water pipe 31, and an electric regulating valve 7 mounted on the supply water pipe 24. The probe of the temperature sensor 6 extends into the inner hole of the supply water pipe 31 to monitor the temperature of the cooling water in real time and transmit the temperature information to the controller. The electric regulating valve 7 is electrically connected to a power source through the controller and is used to control the flow rate of the cooling water. Specifically, the controller is a PLC or microprocessor with a PID temperature control algorithm, which works with temperature sensor 6 and electric water pump 33 to dynamically adjust the water flow based on temperature feedback.

[0040] In one embodiment of this invention, the spiral tube 12 is made of 316L stainless steel or a copper-nickel alloy. This reduces the likelihood of metal ion contamination of the cooling water.

[0041] In one embodiment of this invention, the pipe assembly is made of high-temperature resistant silicone tubing or PVDF rigid tubing. This helps to improve the service life of the pipe assembly.

[0042] In one embodiment of this utility model, such as Figure 3 As shown, it also includes a water filtration assembly 8, which is disposed on the water tank 11 and separates the cooling chamber 1111 and the purification chamber 1112 from the cavity 111. The purification chamber 1112 is connected to the return water pipe 32 through the third connector. The water filtration assembly 8 ensures the water quality in the purification chamber 1112 and reduces the possibility of blockage in the pipeline assembly 3.

[0043] In one embodiment of this utility model, such as Figure 3 As shown, the water filtration assembly 8 includes an assembly frame 81. The outer side of the assembly frame 81 is detachably connected to the water tank 11, and the inner side has a water-passing hollow groove 811. A filter screen 812 and a reverse osmosis membrane 813 are arranged on one side of the water flow direction within the water-passing hollow groove 811. Specifically, the width of the assembly frame 81 is adapted to the width of the cavity 111 of the water tank 11, and its height is greater than the depth of the cavity 111 of the water tank 11. The filter screen 812 is a 50μm stainless steel filter screen used to intercept particulate impurities, and the reverse osmosis membrane 813 removes dissolved salts from the water and prevents scale buildup.

[0044] In one embodiment of this utility model, such as Figure 3 As shown, a filling cavity is left between the filter screen 812 and the reverse osmosis membrane 813, and activated carbon 814 is placed in the filling cavity. The activated carbon 814 is used to remove grease and organic matter from the water and to prevent the pipeline assembly 3 from becoming clogged.

[0045] In one embodiment of this utility model, such as Figure 3 As shown, the bottom wall of the cavity 111 is recessed inward and provided with a slot 1113, while the bottom of the assembly frame 81 is protruding outward and provided with a plug 815 that matches the slot 1113. By using the plug 815 to engage with the slot 1113, the assembly frame 81 can be quickly assembled and disassembled, thereby facilitating the replacement of the water filter assembly 8.

[0046] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An external cooling water circulation device for a twin-screw extruder used for wood-plastic additives, characterized in that: The device includes a heat-absorbing component, a cooling component, and a piping component. The heat-absorbing component includes a water tank, a spiral tube, and a spray head. The water tank is located below the extruder head and has a cavity for accommodating the extruded specimen and cooling water. The spiral tube and the spray head are respectively connected to the cooling component through the piping component to achieve water circulation. The spiral tube is wound around the outer wall of the extruder head, and the spray head is located above the water tank and faces the extruded specimen.

2. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 1, characterized in that: The piping assembly includes a water supply pipe, a return pipe, and a water pump. The inlet end of the water supply pipe is connected to the cooling assembly via the water pump, and the outlet end is provided with a first connector and a second connector. The spiral pipe includes an inlet section, a spiral section, and a drain section. The spiral section fits tightly against the outer wall of the extruder head. One end of the inlet section is connected to the first connector, and the other end is connected to the spiral section. One end of the drain section is connected to the spiral section, and the other end is suspended above the cavity for drainage. A support rod is provided on the water tank, and the water supply pipe is fixed to the upper side of the water tank via the support rod. The spray head is provided with a spray pipe connected to the second connector and is suspended above the water tank via the support rod. A third connector is provided at the end of the water tank away from the extruder, and one end of the return pipe is connected to the third connector, and the other end is connected to the cooling assembly.

3. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 2, characterized in that: The cooling assembly includes a cooler, a cooling tower, a collection pipe, and a water supply pipe. The cooler is provided with a first water inlet, a first water outlet, a second water inlet, and a second water outlet. The return water pipe is connected to the first water inlet, and the supply water pipe is connected to the first water outlet. The water inlet of the cooling tower is connected to the second water outlet through the collection pipe, and the water outlet is connected to the second water inlet through the supply water pipe.

4. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 3, characterized in that: It also includes a controller, a temperature sensor installed on the water supply pipe, and an electric regulating valve installed on the water supply pipe. The probe of the temperature sensor extends into the inner hole of the water supply pipe to monitor the temperature of the cooling water in real time and transmit the temperature information to the controller. The electric regulating valve is electrically connected to the power supply through the controller and is used to control the flow rate of the cooling water.

5. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 1, characterized in that: The spiral tube is made of 316L stainless steel or copper-nickel alloy.

6. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 1, characterized in that: The piping assembly is made of high-temperature resistant silicone tubing or PVDF rigid tubing.

7. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 2, characterized in that: It also includes a water filtration assembly, which is disposed on the water tank and separates the cavity into a cooling chamber and a purification chamber. The purification chamber is connected to the return water pipe through the third connector.

8. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 7, characterized in that: The water filtration assembly includes an assembly frame, the outer side of which is detachably connected to the water tank, and the inner side of which has a water-passing hollow trough. A filter screen and a reverse osmosis membrane are provided on one side of the water-passing hollow trough along the water flow direction.

9. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 8, characterized in that: A filling cavity is left between the filter screen and the reverse osmosis membrane, and activated carbon is placed in the filling cavity.

10. The external cooling water circulation device for a twin-screw extruder for wood-plastic additives according to claim 8, characterized in that: The bottom wall of the cavity is recessed inward and has a slot, while the bottom of the assembly frame is protruding outward and has a plug that matches the slot.

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