A water mist cooling device for a twin-screw extruder

Abstract

The utility model discloses a water mist cooling device for double screw extruder, including machine body chassis, be provided with transmission support on machine body chassis, be provided with several groups of transmission rod that can one -way transmission to color master batch on transmission support to with the baffle of color master batch guide falls into transmission rod, be provided with the side plate on the both sides of machine body chassis, set up the cooling structure of water mist injection cooling to color master batch on two side plate top, be provided with air hole on transmission rod one side, be provided with the air -dry structure of air -dry to color master batch to the air hole on machine body chassis, the utility model discloses the color master batch is exposed to air, and adopts the mode of spraying water mist to cool color master batch, can make the cooling of color master batch become slow cooling, avoid the instantaneous cooling of PET temperature reduction influence color master batch's uniform dispersion, and because the water amount of water mist is less, can save more water resources.

Description

Technical Field

[0001] This utility model relates to the field of plastic equipment, and in particular to a water mist cooling device for a twin-screw extruder. Background Technology

[0002] Twin-screw extruders were developed based on single-screw extruders. Due to their excellent feeding performance, mixing and plasticizing properties, venting performance, and extrusion stability, they are now widely used in the molding and processing of extruded products. Chinese Patent No. CN201736365U discloses an automatic alarm device for broken strands in a water-cooled twin-screw extruder pelletizing production line. A cooling water tank is arranged between the twin-screw extruder and the pelletizer, with the die of the twin-screw extruder facing the cooling water tank. A detector is placed below the die of the twin-screw extruder, and the detector is connected to an alarm via a signal line. Regarding the aforementioned technologies, the inventor believes that the existing technology has the following drawbacks: 1. The water temperature in the water tank will rise as the masterbatch is continuously cooled, affecting the cooling effect of the masterbatch; 2. Using a water tank to instantly cool the masterbatch leads to a decrease in PET temperature, which may affect the uniform dispersion of the masterbatch; 3. A large amount of cooling water becomes non-recyclable wastewater after the cooling process, significantly increasing the environmental burden; 4. The water after cooling will heat up to high temperature, which is prone to corroding equipment, requiring the use of corrosion-resistant materials, thus increasing equipment costs.

[0003] Therefore, there is a need to provide a water mist cooling device for twin-screw extruders to improve the above-mentioned problems. Utility Model Content

[0004] In view of the defects of the prior art, the technical problem to be solved by this utility model is to provide a device for slowly cooling color masterbatch by continuously spraying constant temperature water mist, and also has the functions of color masterbatch transportation and external water mist drying of color masterbatch.

[0005] A water mist cooling device for a twin-screw extruder includes a machine base frame, a transfer support frame mounted on the machine base frame, several sets of transfer rods for unidirectional transfer of masterbatch mounted on the transfer support frame, and baffles guiding the masterbatch onto the transfer rods. Side plates are mounted on the left and right sides of the machine base frame, and a cooling structure for water mist spraying cooling of the masterbatch is mounted on the top of the two side plates. An air hole is mounted on one side of the transfer rod, and an air drying structure for blowing air into the air hole to dry the masterbatch is mounted on the machine base frame.

[0006] Furthermore, each set of transmission rods in this utility model is provided with two symmetrically arranged rods, the outer wall of the rods is provided with spiral ridges, and a motor is provided on the front side of the transmission bracket and connected to the rods.

[0007] Furthermore, in this utility model, the baffle plate is fixed to the top of the transmission bracket and located between each group of transmission rods, and the top two sides of the baffle plate are rounded.

[0008] Furthermore, the cooling structure of this utility model includes a support plate disposed on the front side of the top of two side plates, a plurality of cooling heads disposed at the bottom of the support plate, a plurality of atomizing nozzles disposed at the bottom of the cooling heads, a distribution pipe connected to the top of the cooling heads, a common assembly pipe connected to the top of each distribution pipe and connected to an external water source, and a water pump disposed on the assembly pipe.

[0009] Furthermore, in this invention, multiple air holes are evenly spaced and distributed around the rear end of the transmission rod, and the transmission rod is hollow inside.

[0010] Furthermore, the air-drying structure of this utility model includes a ventilation groove disposed on the rear wall of the transmission support, the ventilation groove being directly opposite the hollow position of each transmission rod, and an air pump being disposed on the base frame of the machine body, one end of the air pump being provided with an air pipe connected to the ventilation groove.

[0011] In summary, the advantages of this utility model over the prior art are: This invention exposes the masterbatch to air and cools it by spraying water mist. This slow cooling process avoids the rapid drop in PET temperature caused by instantaneous cooling, which would affect the uniform dispersion of the masterbatch. Furthermore, the use of water mist requires less water, saving resources. The water mist is not stored for future use, and its temperature does not continuously rise. The device also integrates functions for masterbatch transport and drying the external water mist, resulting in a complete and well-designed overall structure. Attached Figure Description

[0012] Figure 1 This is one of the three-dimensional schematic diagrams of the present utility model; Figure 2 This is the second perspective view of the present invention; Figure 3 This is a three-dimensional schematic diagram of the transmission rod of this utility model; Figure 4 This is a three-dimensional schematic diagram of the cooling structure of this utility model; Figure 5 This is a three-dimensional schematic diagram of the air-drying structure of this utility model. Detailed Implementation

[0013] The present invention will be further described below with reference to the accompanying drawings and specific embodiments: like Figures 1 to 5The present invention preferably provides a water mist cooling device for a twin-screw extruder, comprising a machine base frame 1, a transmission support 2 on the machine base frame 1, a plurality of transmission rods 3 for unidirectional transmission of masterbatch on the transmission support 2, and a baffle plate 4 for guiding the masterbatch onto the transmission rods 3. Side plates 21 are provided on the left and right sides of the machine base frame 1, and a cooling structure 5 for water mist spraying cooling of the masterbatch is provided on the top of the two side plates 21. An air hole 6 is provided on one side of the transmission rod 3, and an air drying structure 7 for blowing air to the air hole 6 to dry the masterbatch is provided on the machine base frame 1. The transmission support is mounted on the machine base. Multiple transmission rods on the support are positioned below the masterbatch outlet at the rear of the twin-screw extruder. After the masterbatch falls onto the transmission rods, a motor drives the rods to rotate, causing the masterbatch to rotate and gradually move backward. Simultaneously, a cooling structure on the top of the side plate sprays water mist, covering the masterbatch for slow cooling. As the masterbatch moves backward to the air vents, a drying structure allows air to blow out, gradually drying and removing the water mist from the surface. A storage container at the rear collects the masterbatch, completing the cooling process. This technical solution is highly suitable for cooling equipment after pelletizing in a twin-screw extruder.

[0014] In this invention, each set of transmission rods 3 has two symmetrically arranged rod bodies 31. Spiral ridges 32 are provided on the outer wall of each rod body 31. A motor 33 is located on the front side of the transmission bracket 2 and connected to the rod body 31. This technical solution provides three sets of transmission rods, convenient for handling multiple production lines. Each set of transmission rods has two rod bodies with symmetrically arranged spiral ridges. The corresponding motors rotate in opposite directions. Therefore, when the motor drives the rod bodies to rotate, the two rod bodies rotate counterclockwise on the left and clockwise on the right, respectively, allowing the masterbatch to gradually move backward between the two rod bodies. The spiral ridges are the main part used to propel the masterbatch backward.

[0015] In this invention, the baffle plate 4 is fixed to the top of the transmission bracket 2 and located between each set of transmission rods 3. The top two sides of the baffle plate 4 are rounded. The baffle plate is used to cover the gaps formed between each set of transmission rods, preventing the masterbatch from falling in and being squeezed downwards by the rod of the two sets of transmission rods that are close to each other. Furthermore, the rounded corners on the top two sides of the baffle plate allow the masterbatch to fall onto the baffle plate and naturally fall back onto the transmission rod.

[0016] The cooling structure 5 of this invention includes a support plate 51 located on the front side of the top of two side plates 21. Several cooling heads 52 are located at the bottom of the support plate 51, and several atomizing nozzles 53 are located at the bottom of each cooling head 52. A distribution pipe 54 is connected to the top of each cooling head 52. A common assembly pipe 55 is connected to the top of each distribution pipe 54 and connected to an external water source. A water pump 56 is installed on the assembly pipe 55. The water source connected to the assembly pipe can preferably be a constant temperature water tank, or it can be directly connected to commercial or domestic water. After entering the assembly pipe, the water is pressurized by the water pump and flows into each distribution pipe, then into the cooling head. The water is then atomized and sprayed out through each atomizing nozzle. The sprayed water mist adheres to the outer wall of the masterbatch below, exchanging heat with it and slowly cooling it.

[0017] In this invention, multiple air holes 6 are evenly distributed at intervals and located on the outer periphery of the rear end of the transmission rod 3, which is hollow inside. After the masterbatch is transported to the air hole position, air can be ejected through the air supply of the drying structure to dry the moisture on the surface of the masterbatch.

[0018] The air-drying structure 7 of this invention includes a ventilation groove 71 disposed on the rear wall of the transmission support 2. The ventilation groove 71 is directly opposite the hollow position of each transmission rod 3. An air pump 72 is disposed on the base frame 1, and one end of the air pump 72 is provided with an air pipe 73 connected to the ventilation groove 71. When the air pump is started, air is drawn in from the bottom, transported through the air pipe to the ventilation groove, and then enters the hollow position of each transmission rod before being ejected from the air hole. This air pump can be equipped with a temperature control device, which makes it easier to control the type of gas.

[0019] The foregoing has shown and described the basic principles and main features of this utility model, as well as its advantages. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A water mist cooling device for a twin-screw extruder, comprising a machine base frame (1), characterized in that: A transmission support (2) is provided on the machine base frame (1). Several sets of transmission rods (3) capable of unidirectional transmission of color masterbatch are provided on the transmission support (2), as well as a baffle plate (4) that guides the color masterbatch to fall onto the transmission rods (3). Side plates (21) are provided on the left and right sides of the machine base frame (1). A cooling structure (5) for water mist spraying cooling of the color masterbatch is provided on the top of the two side plates (21). An air hole (6) is provided on one side of the transmission rod (3). A drying structure (7) for blowing air to the air hole (6) to dry the color masterbatch is provided on the machine base frame (1).

2. The water mist cooling device for a twin-screw extruder according to claim 1, characterized in that: Each of the transmission rods (3) has two symmetrically arranged rod bodies (31), and spiral ridges (32) are provided on the outer wall of the rod body (31). A motor (33) is provided on the front side of the transmission bracket (2) and connected to the rod body (31).

3. A water mist cooling device for a twin-screw extruder according to claim 1, characterized in that: The shield (4) is fixed on the top of the transmission bracket (2) and located between each group of transmission rods (3), and the top two sides of the shield (4) are rounded.

4. A water mist cooling device for a twin-screw extruder according to claim 1, characterized in that: The cooling structure (5) includes a support plate (51) disposed on the front side of the top of the two side plates (21), a plurality of cooling heads (52) are disposed at the bottom of the support plate (51), a plurality of atomizing nozzles (53) are disposed at the bottom of the cooling heads (52), a diversion pipe (54) is connected to the top of the cooling heads (52), a common assembly pipe (55) is connected to the top of each diversion pipe (54) and connected to an external water source, and a water pump (56) is disposed on the assembly pipe (55).

5. A water mist cooling device for a twin-screw extruder according to claim 1, characterized in that: The air holes (6) are evenly spaced and distributed around the rear end of the transmission rod (3), and the transmission rod (3) is hollow inside.

6. A water mist cooling device for a twin-screw extruder according to claim 1, characterized in that: The air-drying structure (7) includes a ventilation groove (71) set on the rear wall of the transmission support (2). The ventilation groove (71) is directly opposite the hollow position of each transmission rod (3). An air pump (72) is set on the machine base frame (1). One end of the air pump (72) is provided with an air pipe (73) connected to the ventilation groove (71).

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