Screw extruder

Abstract

The utility model discloses a screw extruder which comprises a plurality of shells which are connected with one another, each shell is provided with an extrusion channel, heat conducting plates are arranged on the peripheries of the shells in a surrounding mode, and a plurality of circles of heat conducting oil hole channels and a plurality of circles of cooling water hole channels are arranged on the outer sides of the extrusion channels in a surrounding mode. Uniform heating of the shell of the screw extruder can be achieved through the heat conduction oil hole channel and the heat conduction plate, meanwhile, the temperature of the shell is within the optimal working temperature range through flowing of cooling water in the cooling water hole channel, and energy loss is reduced through circular flowing of heat conduction oil. Therefore, energy of a high-temperature section of the screw extruder can be recycled to be used in a low-temperature section, and the effects of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The utility model relates to the technical field of extruder equipment, in particular to a screw extruder. Background Technique

[0002] A screw extruder is a conventional rubber and plastic processing mechanical equipment, which is widely used in polymer blending, filling modification, regeneration and extrusion granulation. Temperature is one of the most important factors affecting the properties of products during the use of a screw extruder. For example, the above polymer blending, filling modification, regeneration and extrusion granulation belong to the quality of the final product obtained after the synergistic action of thermal / mechanical shear. Temperature plays a crucial role in it. The temperatures of each section of the screw extruder are different. Traditional extruders are prone to energy loss in the high-temperature section. How to make good use of this part of energy and reduce energy loss has attracted more and more attention.

[0003] When the screw extruder works, the temperature control requirements are very high. The traditional heating methods are insert-type resistance heating or adding heating plates on the outside. However, once the insert-type heating fails, its repair is difficult. Adding heating plates also has potential safety hazards. The existing temperature control technology of screw extruders only arranges heating and cooling systems around the shell, lacking an energy recovery system. Therefore, it is difficult to realize the energy recovery of the high-temperature section of the screw extruder for use in the low-temperature section.

[0004] The Chinese utility model patent "A Side Heater Assembly of a Screw Extruder" with the publication number CN220638856U indirectly heats the barrel by installing heat conduction plates around the outside of the barrel, fixing the heat conduction plates with positioning pins, and then inserting heating rods into the heat conduction plates. The controllability of barrel heating can be realized, and the heating degree can be controlled by arbitrarily changing the number of inserted heating rods. However, since the high-temperature heat generated by the heating element is not completely absorbed by the material, part of the heat is dissipated into the surrounding environment through heat conduction, convection or radiation, resulting in the problem of energy loss in the high-temperature section still existing. Content of the Utility Model

[0005] To solve the problems existing in the above-mentioned prior art, the utility model provides a screw extruder. Through the heat-conducting oil channels and heat conduction plates, uniform heating of the shell of the screw extruder can be realized. At the same time, the temperature of the shell is kept within the optimal working temperature range by the flow of cooling water in the cooling water channels. The energy loss is reduced by the circulating flow of the heat-conducting oil, so as to realize that the energy of the high-temperature section of the screw extruder can be recovered for use in the low-temperature section, achieving the effect of energy conservation and emission reduction.

[0006] The technical solution of the utility model is as follows:

[0007] A screw extruder includes a number of interconnected extruder units. Each extruder unit includes a housing. An extrusion channel is formed in the housing. Heat conducting plates are arranged around the housing. Multiple circles of successively connected heat conducting oil channels and multiple circles of successively connected cooling water channels are arranged around the outside of the extrusion channel. Cooling water outlets, heat conducting oil outlets, cooling water inlets, and heat conducting oil inlets are successively formed around the bottom of the housing. The screw extruder further includes an oil tank. The output end of the oil tank is connected to the heat conducting oil inlets at the bottom of several of the housings through sealed pipelines, and the input end of the oil tank is connected to the heat conducting oil outlets at the bottom of several of the housings through sealed pipelines.

[0008] Further, a first communication channel is arranged between adjacent heat conducting oil channels, and a second communication channel is arranged between adjacent cooling water channels.

[0009] Further, a number of positioning pins are fixedly arranged on one side of the housing, and positioning holes are formed on the other side of the housing to cooperate with the positioning pins of the adjacent housing. A number of first bolts are rotatably connected to one side of the housing, and mounting holes are formed on the other side of the housing to cooperate with the number of first bolts of the adjacent housing. Third communication channels are symmetrically formed on both sides of the housing, and the inner sides of the third communication channels are respectively communicated with the closest heat conducting oil channels.

[0010] Further, a number of heating rods are inserted into the heat conducting plates.

[0011] Further, the heat conducting plates are detachably connected to the housing through second bolts.

[0012] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0013] The present utility model can achieve uniform heating of the housing of the screw extruder through the heat conducting oil channels and the heat conducting plates. At the same time, the temperature of the housing is maintained within the optimal working temperature range by the flow of cooling water in the cooling water channels. The energy loss is reduced by the circulating flow of the heat conducting oil between each extruder unit, so that the energy in the higher temperature section of the screw extruder can be recycled for use in the lower temperature section, achieving the effect of energy conservation and emission reduction. Description of the Drawings

[0014] Figure 1 It is the front view of the extruder unit in the present utility model;

[0015] Figure 2 It is the left view of the extruder unit in the present utility model;

[0016] Figure 3 It is the left sectional view of the extruder unit in the present utility model;

[0017] Figure 4It is the top view of the extruder unit in the present utility model;

[0018] Figure 5 It is the top cross-sectional view of the extruder unit in the present utility model;

[0019] Figure 6 It is the partial cross-sectional view of the extruder unit in the present utility model;

[0020] Figure 7 It is the top cross-sectional view of the extruder unit in the present utility model;

[0021] Figure 8 It is the schematic structural diagram of the screw extruder in the present utility model.

[0022] In the attached drawings, the list of components represented by each reference numeral is as follows:

[0023] 1. Housing; 2. Heat transfer oil channel; 3. Cooling water channel; 4. Heat transfer plate; 5. Heating rod; 6. Positioning pin; 7. First bolt; 8. Third communication channel; 9. Second communication channel; 10. First communication channel; 11. Cooling water outlet; 12. Heat transfer oil outlet; 13. Cooling water inlet; 14. Heat transfer oil inlet; 15. Extrusion channel; 16. Positioning hole; 17. Mounting hole; 18. Oil tank. Specific embodiments

[0024] In order to make the content described in the present utility model easier to understand, the following further describes the technical solution of the present utility model in combination with specific embodiments and the attached drawings, but the present utility model is not limited thereto.

[0025] Please refer to Figures 1 to 7 , the present utility model provides a technical solution: a screw extruder, including a plurality of interconnected extruder units. The extruder unit includes a housing 1. The housing 1 is provided with an extrusion channel 15. A plurality of heat transfer plates 4 are arranged around the housing 1. A plurality of heating rods 5 are arranged through the heat transfer plates 4. A plurality of sequentially connected heat transfer oil channels 2 and a plurality of sequentially connected cooling water channels 3 are arranged around the outside of the extrusion channel 15. Both the heat transfer oil channel 2 and the cooling water channel 3 are rectangular channels. The heat transfer oil channel 2 and the cooling water channel 3 are uniformly arranged along the axis direction of the housing 1. The heat transfer oil channel 2 is arranged outside the cooling water channel 3. The screw extruder further includes an oil tank 18. The output end of the oil tank 18 is respectively connected to the heat transfer oil inlets 14 at the bottoms of a plurality of housings 1 through sealed pipes. The input end of the oil tank 18 is respectively connected to the heat transfer oil outlets 12 at the bottoms of a plurality of housings 1 through sealed pipes.

[0026] Refer to Figure 8, the screw extruder consists of an oil tank 18 and several extruder units. Among them, several extruder units located in the material inlet section need to quickly melt the material through the heating rods 5 due to the low temperature in the material inlet section. When the material melts and enters the intermediate section extruder units, the extruder units continuously extrude and rotate the material, and the extrusion heat and shear heat cause the temperature of the material to rise. In the subsequent several extruder units, the temperature needs to be reduced. Therefore, the temperatures of each extruder unit are different. Through the design of the third communication channel 8 and the oil tank 18, the extruder unit can transport the heat-conducting oil of the front-end extruder unit to the rear-end extruder unit, reducing the use of the heating rod 5 for heating the rear-end extruder unit, thereby reducing the use of electric energy. It can also circulate the waste heat of the rear extruder unit to the front extruder unit through the oil tank 18 for use, so as to achieve the effect of energy conservation and emission reduction.

[0027] As a further preference of this embodiment, the heat-conducting plate 4 is an L-shaped heat-conducting plate. The material of the heat-conducting plate 4 is copper or an alloy of copper. Four heating rods 5 are arranged in each heat-conducting plate 4. The heat-conducting plates 4 surround the housing 1 from both sides of the housing 1. The heating rods 5 are in interference fit with the heat-conducting plates 4. The heating rods 5 are essentially a large resistor, and Joule heat is generated by connecting the positive and negative electrodes to conduct electricity. The heating rods 5 conduct the heat to the heat-conducting plates 4, and the heat is evenly dispersed to the surface of the housing 1 through the L-shaped heat-conducting plates 4, so that it is evenly heated.

[0028] As a further preference of this embodiment, a first communication channel 10 is arranged between adjacent heat-conducting oil channels 2, and a second communication channel 9 is arranged between adjacent cooling water channels 3. Cooling water outlets 11, heat-conducting oil outlets 12, cooling water inlets 13, and heat-conducting oil inlets 14 are successively arranged around the bottom of the housing 1. The heat-conducting oil enters any heat-conducting oil channel 2 from the heat-conducting oil inlet 14 at the bottom of the housing 1 and enters the next heat-conducting oil channel 2 through the first communication channel 10. When the heat-conducting oil fills all the heat-conducting oil channels 2, it flows out from the heat-conducting oil outlet 12. The cooling water enters any cooling water channel 3 from the cooling water inlet 13 at the bottom of the housing 1 and enters the next cooling water channel 3 through the second communication channel 9. When the cooling water fills all the cooling water channels 3, it flows out from the cooling water outlet 11.

[0029] As a further preference of this embodiment, the temperature of the heat-conducting oil is 240 °C. The operating temperature of the heat-conducting oil is close to the melting temperature of the material. The temperature of the heating rod 5 is much higher than the melting temperature of the material and is used to heat the material. Uniform heating of the housing 1 of the screw extruder can be achieved through the heat-conducting oil passage 2 and the heat-conducting plate 4. Generally, high specific heat capacity liquids such as water are used as the cooling water for rapid cooling of the device when it overheats. Its operating temperature is generally the ambient temperature. The temperature of the housing 1 is maintained within the optimal operating temperature range through the flow of the cooling water in the cooling water passage 3. The recycling flow of the heat-conducting oil reduces energy loss, so that the energy in the higher temperature section of the screw extruder can be recycled for use in the lower temperature section, achieving the effect of energy conservation and emission reduction.

[0030] As a further preference of this embodiment, a plurality of positioning pins 6 are fixedly arranged on one side of the housing 1, and positioning holes 16 adapted to the positioning pins 6 of the adjacent housing 1 are provided on the other side of the housing 1. A plurality of first bolts 7 are rotatably connected to one side of the housing 1, and mounting holes 17 adapted to the plurality of first bolts 7 of the adjacent housing 1 are provided on the other side of the housing 1. Before connecting the adjacent housing 1, positioning is carried out through the positioning pins 6 and the positioning holes 16, and then the tight connection between the two housings 1 is realized through the first bolts 7.

[0031] As a further preference of this embodiment, third communication channels 8 are symmetrically provided on both sides of the housing 1 respectively. The inner sides of the third communication channels 8 are respectively communicated with the closest heat-conducting oil passage 2. Sealing rings are arranged on the outer sides of the third communication channels 8. When the two housings 1 are connected, the sealing rings can prevent the heat-conducting oil from leaking at the connection of the housing 1.

[0032] As a further preference of this embodiment, the heat-conducting plate 4 is detachably connected to the housing 1 through second bolts.

[0033] The working principle of the present utility model:

[0034] The screw extruder is composed of an oil tank 18 and a plurality of extruder units. The extruder unit includes a housing 1. An extrusion channel 15 is provided in the housing 1, and an L-shaped heat-conducting plate 4 and a heating rod 5 are arranged around it. A plurality of connected heat-conducting oil passages 2 and a plurality of connected cooling water passages 3 are provided outside the extrusion channel 15 to achieve uniform heating of the material. The heat-conducting oil of the front extruder unit can be conveyed to the rear extruder unit, reducing the use of the heating rod 5 for heating the rear extruder unit, thereby reducing the use of electric energy. The waste heat of the rear extruder unit can also be conveyed to the oil tank 18 through a pipeline and recycled for use by the front extruder unit to achieve the effect of energy conservation and emission reduction, realizing the effective recovery and utilization of energy. In addition, the housings 1 are tightly connected through positioning pins 6, positioning holes 16, first bolts 7 and mounting holes 17, and the third communication channels 8 and the sealing ring design are used to prevent the heat-conducting oil from leaking, ensuring the stability and safety of the equipment.

[0035] The above are only embodiments of the present utility model, and do not thereby limit the patent scope of the present utility model. Any equivalent structure or equivalent process transformation made by using the content of the specification of the present utility model, or directly or indirectly applied in other related technical fields, shall similarly be included within the patent protection scope of the present utility model.

Claims

1. A screw extruder, comprising a plurality of interconnected extruder units, wherein the extruder units comprise a housing (1), the housing (1) is provided with an extrusion channel (15), and a heat conducting plate (4) is arranged around the housing (1), wherein: The outer side of the extrusion channel (15) is surrounded by a plurality of circles of sequentially connected heat transfer oil channels (2) and a plurality of circles of sequentially connected cooling water channels (3); the bottom of the shell (1) is sequentially provided with a cooling water outlet (11), a heat transfer oil outlet (12), a cooling water inlet (13) and a heat transfer oil inlet (14); the screw extruder also includes an oil tank (18); the output end of the oil tank (18) is respectively connected to a plurality of heat transfer oil inlets (14) at the bottom of the shell (1) through a sealed pipe; the input end of the oil tank (18) is respectively connected to a plurality of heat transfer oil outlets (12) at the bottom of the shell (1) through a sealed pipe.

2. A screw extruder according to claim 1, characterized in that: A first connecting channel (10) is provided between adjacent heat-conducting oil channels (2), and a second connecting channel (9) is provided between adjacent cooling water channels (3).

3. A screw extruder according to claim 1, characterized in that: A plurality of positioning pins (6) are fixedly provided on one side of the shell (1), and a positioning hole (16) cooperating with the positioning pins (6) of the adjacent shell (1) is provided on the other side of the shell (1). A plurality of first bolts (7) are rotatably connected to one side of the shell (1), and a mounting hole (17) cooperating with the plurality of first bolts (7) of the adjacent shell (1) is provided on the other side of the shell (1). Third communication channels (8) are symmetrically provided on both sides of the shell (1), and the inner sides of the third communication channels (8) are respectively connected with the heat transfer oil channels (2) closest thereto.

4. A screw extruder according to claim 1, characterized in that: A plurality of heating rods (5) are inserted into the heat conducting plate (4).

5. A screw extruder according to claim 1, characterized in that: The heat conducting plate (4) is detachably connected to the housing (1) via a second bolt.

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