An electromagnetic heating body, equipment and system for a two-part twin-screw extruder barrel

Abstract

This invention relates to the field of twin-screw extruder technology, specifically to a two-part twin-screw extruder barrel electromagnetic heating body, equipment, and system. The electromagnetic heating body consists of two L-shaped main bodies hinged together to form a rectangular structure. A through hole is opened in the middle of the rectangular structure to serve as a space for accommodating the die barrel. The outer shell is made of mica sheet assembled using corner brackets. Its inner surface is lined with radiation-shielding material, and the inside of the radiation-shielding material is lined with thermal insulation cotton. An electromagnetic coil is placed on the thermal insulation cotton. The innermost side is sealed with a thin mica sheet to the electromagnetic coil, thermal insulation cotton, and radiation-shielding material. The electromagnetic coil is electrically connected to an electromagnetic heater. This invention uses electromagnetic heating of the barrel to generate its own heat, avoiding secondary energy waste caused by heat transfer, improving heating efficiency. Compared with resistance wire heating, the power saving rate during normal production can reach 50%, and it also increases production capacity to a certain extent. It also has the advantages of precise temperature control and reduced ambient temperature.

Description

Technical Field

[0001] This invention relates to the field of twin-screw extruder technology, specifically to an electromagnetic heating body for a two-part twin-screw extruder barrel, an electromagnetic heating device including the electromagnetic heating body, and an electromagnetic heating system including the electromagnetic heating device. Background Technology

[0002] Twin-screw extruders are mainly used for producing pipes, sheets, granules, and profiles, and have a wide range of applications in the market. However, the heating methods currently used in twin-screw extruders are mainly resistance wire heating and nano-infrared heating. Resistance wire heating has low efficiency, high heat loss during heat conduction, high ambient temperature, uneven heating of the barrel, and insufficient temperature control precision. Nano-infrared heating causes secondary energy waste during heat transfer, and the heating lamps are prone to breakage, glue leakage, and electric arcing that can cause fires. Summary of the Invention

[0003] To address the shortcomings of existing technologies, this invention provides an electromagnetic heating body, equipment, and system for a two-part twin-screw extruder barrel. Electromagnetic heating technology is used to provide energy to the twin-screw extruder barrel, enabling it to heat up on its own. This avoids the energy waste problem in existing heat transfer processes, improves heating efficiency, significantly reduces the ambient temperature in the factory, shortens preheating time, and improves temperature control accuracy.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a two-part twin-screw extruder electromagnetic heating body, wherein the electromagnetic heating body is composed of two L-shaped main bodies hinged together to form a rectangular structure, a through hole is opened in the middle of the rectangular structure to serve as a space for accommodating the mold barrel, the outer shell of the electromagnetic heating body is made of mica plate assembled by corner brackets, its inner surface is covered with radiation-shielding material, the inside of the radiation-shielding material is lined with heat insulation cotton, the electromagnetic coil is laid on the heat insulation cotton, and the innermost side is sealed with a thin mica plate to the electromagnetic coil, the heat insulation cotton and the radiation-shielding material; the electromagnetic coil passes through the mica plate and is electrically connected to the electromagnetic heater.

[0005] Preferably, the electromagnetic coil is laid on the inner surface of the insulation cotton, as well as on the top side and the left and right sides.

[0006] Preferably, the outer shell of the electromagnetic heating body is provided with a temperature detection hole, the position of which is consistent with the holes on the radiation shielding material, insulation cotton and inner thin mica plate, and is coaxial with the temperature detection hole of the mold barrel; the surface of the mica plate of the electromagnetic heating body is provided with a temperature detection structure, which is electrically connected to the electromagnetic heater, and is set with a corresponding temperature value. If the set value is exceeded, a signal is fed back to the electromagnetic heater to alarm and stop working.

[0007] The present invention also provides an electromagnetic heating device for a two-screw extruder, the electromagnetic heating device comprising an electromagnetic heating body, a support, and an electromagnetic heater.

[0008] The electromagnetic heating body adopts the electromagnetic heating body described above;

[0009] The outer wall of the mica plate of the electromagnetic heating body shell is provided with an insert hinge. One side plate of the support is provided with a pin that is inserted into the hinge hole of the outer wall of the mica plate. The other side plate of the support is provided with a support buckle that is engaged with the locking ring provided on the outer wall of the mica plate to fix the support to the outer wall of the mica plate.

[0010] The electromagnetic heater has a screw hole on its back, and the support also has a corresponding screw hole. The screw passes through the hole on the support and is screwed into the screw hole on the back of the electromagnetic heater to fix the electromagnetic heater to the support.

[0011] The present invention also provides an electromagnetic heating system for a two-part twin-screw extruder barrel, the electromagnetic heating system comprising an electromagnetic heating device and a die barrel fixed within a through hole in the middle of the electromagnetic heating body.

[0012] The mold barrel is I-shaped, with its central recess located in the through hole in the middle of the electromagnetic heating body, and its two protruding ends located outside the electromagnetic heating body and having a flange structure. Multiple mold barrels are connected and fixed in series through the flanges at both ends.

[0013] The electromagnetic heating device is the same as described above, and its number is the same as the number of the plurality of mold cylinders. The electromagnetic heating body in the electromagnetic heating device covers the outside of the recessed part of the mold cylinder in a corresponding manner, and heats the mold cylinder under the control of the electromagnetic heater.

[0014] Preferably, a U-shaped heat insulation cover is fitted around the flange connection of the multiple series-fixed mold barrels. The width of the heat insulation cover is equal to the width of the flange at the connection of the two mold barrels, and the thickness of the bottom of the U-shape is equal to the height from the top of the flange to the top surface of the electromagnetic heating body. When the heat insulation cover is fitted around the flange connection, it fills the gap between the electromagnetic heating bodies to form a flat whole with the electromagnetic heating bodies.

[0015] Furthermore, the U-shaped insulation cover shell is a three-sided insulation structure composed of mica panels, with insulation cotton filled inside, and the innermost side sealed with a thin mica panel.

[0016] The beneficial effects of this invention are:

[0017] 1. This invention uses an electromagnetic heating barrel to generate its own heat, avoiding secondary energy waste caused by heat transfer, improving heating efficiency, and achieving a power saving rate of up to 50% compared to resistance wire heating during normal production, while also increasing production capacity.

[0018] 2. The present invention has a more obvious heat preservation effect, reducing the surface temperature by 50°C compared to resistance wire heating equipment, thus greatly reducing the ambient temperature.

[0019] 3. This invention can effectively shorten the preheating time, make temperature control more precise during normal production, and facilitate adjustment.

[0020] 4. This invention uses an electromagnetic coil that can heat both the barrel plane and the flange side, ensuring that both the barrel and the connecting flange can be heated, reducing the load on the screw and the main unit, and improving service life.

[0021] 5. The electromagnetic heater of this invention is placed on the side of the heating equipment, which makes it easy to operate, avoids interference from wires, and improves control accuracy.

[0022] 6. The heating device of the present invention has a surface temperature sensing structure on its surface to achieve over-temperature protection.

[0023] 7. The electromagnetic heating device of this invention is equipped with radiation-proof material inside to avoid harm to the human body and to prevent accidents caused by glue leakage. Attached Figure Description

[0024] Figure 1 This is an exploded structural diagram of the electromagnetic heating body of the present invention;

[0025] Figure 2 This is a structural diagram of a single electromagnetic heating body of the present invention with the innermost thin mica plate removed;

[0026] Figure 3 This is a three-dimensional structural diagram of the electromagnetic heating body of the present invention;

[0027] Figure 4 This is a front view structural diagram of the electromagnetic heating body of the present invention;

[0028] Figure 5 for Figure 4 Sectional view A-A;

[0029] Figure 6 This is a three-dimensional structural diagram of a single electromagnetic heating body according to Embodiment 2 of the present invention;

[0030] Figure 7 This is a three-dimensional structural diagram of the electromagnetic heating body of the present invention, in embodiment two.

[0031] Figure 8 This is a three-dimensional structural diagram of a single electromagnetic heating body according to Embodiment 3 of the present invention;

[0032] Figure 9This is a three-dimensional structural diagram of the electromagnetic heating body of the present invention, in embodiment three.

[0033] Figure 10 This is a three-dimensional structural diagram of the electromagnetic heating body of the present invention, in embodiment four.

[0034] Figure 11 This is a three-dimensional structural diagram of the electromagnetic heating device of the present invention;

[0035] Figure 12 This is an exploded structural diagram of the electromagnetic heating body and the mold barrel of the present invention;

[0036] Figure 13 This is a three-dimensional structural diagram of the electromagnetic heating device and mold barrel of the present invention;

[0037] Figure 14 This is a front view structural diagram of the electromagnetic heating device and mold barrel of the present invention;

[0038] Figure 15 for Figure 14 B-B sectional view;

[0039] Figure 16 This is a three-dimensional structural diagram of the heat insulation cover of the present invention;

[0040] Figure 17 This is a cross-sectional view of the heat insulation cover of the present invention;

[0041] Figure 18 The three-dimensional structure of the electromagnetic heating system of the present invention. Figure 1 ;

[0042] Figure 19 The three-dimensional structure of the electromagnetic heating system of the present invention. Figure 2 . Detailed Implementation

[0043] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The invention will be further described in detail below with reference to the accompanying drawings.

[0044] like Figures 1-5 As shown, the present invention discloses a two-part twin-screw extruder electromagnetic heating body 1. The electromagnetic heating body 1 is composed of two L-shaped main bodies hinged together to form a rectangular structure. A through hole is opened in the middle of the rectangular structure to serve as the accommodating space for the mold barrel 14. The outer shell of the electromagnetic heating body 1 is assembled using mica plates 2 by corner brackets 4. Its inner surface is covered with radiation-shielding material 7. The radiation-shielding material 7 is filled with heat-insulating cotton 6. An electromagnetic coil 5 is laid on the heat-insulating cotton 6. The innermost side is sealed with a thin mica plate 3 to the electromagnetic coil 5, the heat-insulating cotton 6, and the radiation-shielding material 7. The electromagnetic coil 5 passes through the mica plate 2 and is electrically connected to the electromagnetic heater 13.

[0045] The two L-shaped structures are fixed on one side using a detachable buckle and on the other side using a locking buckle 9 combination. This invention adopts a folding and connecting structure, which can greatly reduce the difficulty of installation and disassembly. This invention uses an electromagnetic heating barrel to generate its own heat, avoiding secondary energy waste caused by heat transfer, improving heating efficiency. Compared with resistance wire heating, the power saving rate can reach 50% during normal production, and it also increases production capacity to a certain extent.

[0046] The electromagnetic coil 5 is laid on the inner surface of the insulation cotton 6, as well as on the top side and the left and right sides, as shown below. Figure 2 As shown, when laying the electromagnetic coil, one can choose to use a whole electromagnetic coil, with its main body laid on the surface of the insulation cotton, while the top and left and right sides that extend beyond the surface of the insulation cotton are folded at 90° and laid on the top and left and right sides of the insulation cotton. Alternatively, multiple sets of coils can be laid on the inner surface of the insulation cotton, as well as on the top and left and right sides, respectively. By connecting multiple sets of coils in series or in parallel, the electromagnetic coils can be controlled as a whole or independently.

[0047] This structural design is adopted because the mold barrel 14 is I-shaped. When it is placed inside the through hole in the middle of the rectangular structure of the electromagnetic heating body 1, the recessed part in the middle of the mold barrel 14 is located inside the through hole in the middle of the electromagnetic heating body 1. Figure 12-15 Therefore, the electromagnetic coil inside the through hole can electromagnetically heat the recessed part in the middle of the mold barrel 14. At the same time, the flanges protruding at both ends of the mold barrel 14 are located on the left and right sides of the electromagnetic heating body 1. Since electromagnetic coils are also laid here, the electromagnetic coils here can also heat the flanges simultaneously, ensuring the uniformity of the material temperature at the flange and the material inside the barrel, reducing the load on the screw and the main machine, improving product quality, and extending the service life of the machine.

[0048] The outer shell of the electromagnetic heating body 1 is provided with a temperature detection hole 8. The position of the temperature detection hole 8 is consistent with the hole positions on the radiation shielding material 7, the insulation cotton 6 and the inner thin mica plate 3, and is coaxial with the temperature detection hole of the mold barrel 14. The surface of the mica plate 2 of the electromagnetic heating body 1 is provided with a temperature detection structure. The temperature detection structure is electrically connected to the electromagnetic heater. It is set with a corresponding temperature value. If the set value is exceeded, a signal is fed back to the electromagnetic heater to alarm and stop working.

[0049] Figures 6-10 The following are structural diagrams of embodiments two to four of the present invention. These embodiments are based on embodiment one, with the electromagnetic heating body having a hollowed-out structure on one or both sides, so as to apply it to different scenarios. They are described below.

[0050] Figure 6 and Figure 7This is a structural diagram of Embodiment 2 of the present invention. This embodiment is based on Embodiment 1, with the upper plane of the electromagnetic heating body 1 hollowed out. The electromagnetic heating body 1 is a rectangular structure formed by hinged two L-shaped main bodies. The upper plane of one of the L-shaped main bodies is hollowed out, and the other three sides are respectively covered with radiation-proof material 7, heat insulation cotton 6, electromagnetic coil 5 and thin mica plate 3. The latch 9 is set at the front end of the two side plates of the hollowed-out main body and is engaged with the locking ring correspondingly set on the side wall of the other main body. The inner wall of the mica plate 2 is provided with an inner partition 10. The inner partition 10, the mica plate 2 and the thin mica plate 3 seal the electromagnetic coil 5, heat insulation cotton 6 and radiation-proof material 7.

[0051] Because the insulation cotton fixed to the inner wall of the mica plate 2 of the electromagnetic heating body shell has a certain thickness, when the two L-shaped electromagnetic heating bodies 1 are interlocked, the front end of electromagnetic heating body 1 will be in contact with the front end of the other electromagnetic heating body, rather than with the outer wall of the mold cylinder. Therefore, the part that is in contact with the front end of the other electromagnetic heating body does not need to be covered with insulation cotton and electromagnetic coils; it can be made into a hollow structure directly. Figure 1 , Figure 2 , Figure 6 , Figure 8 , Figure 10 and Figure 12 As shown, this design aims to save costs and reduce energy consumption. An inner partition 10 is provided on the inner wall of the mica plate 2. The inner partition 10, together with the mica plate 2 and the thin mica plate 3, seals the electromagnetic coil 5, the insulation cotton 6, and the radiation shielding material 7. This prevents the electromagnetic coil 5, the insulation cotton 6, and the radiation shielding material 7 from falling off the through hole in the middle of the electromagnetic heating body 1 due to gravity in the vertical plane, thus reducing heating efficiency.

[0052] Figure 8 and Figure 9 This is a structural diagram of Embodiment 3 of the present invention. This embodiment is based on Embodiment 1, with the rear plane of the electromagnetic heating body 1 hollowed out. The electromagnetic heating body 1 is a rectangular structure formed by hinged two L-shaped main bodies. The rear plane of one of the L-shaped main bodies is hollowed out, and the other three sides are respectively covered with radiation-proof material 7, heat insulation cotton 6, electromagnetic coil 5 and thin mica plate 3. The latch 9 is set at the front end of the two side plates of the hollowed-out main body and is engaged with the locking ring corresponding to the side wall of the other main body. The inner wall of the mica plate 2 is provided with an inner partition 10. The inner partition 10, the mica plate 2 and the thin mica plate 3 seal the electromagnetic coil 5, heat insulation cotton 6 and radiation-proof material 7.

[0053] Figure 10This is a structural diagram of Embodiment 4 of the present invention. This embodiment is based on Embodiment 1, with the upper and rear planes of the electromagnetic heating body 1 being hollowed out simultaneously. The electromagnetic heating body 1 is a rectangular structure formed by hinged two L-shaped main bodies. The upper plane of one L-shaped main body is hollowed out, and the rear plane of the other main body is hollowed out. The other two sides of the electromagnetic heating body 1 are respectively covered with radiation-shielding material 7, insulation cotton 6, electromagnetic coil 5, and thin mica plate 3. The latch 9 is set at the front end of the inner wall of the hollowed-out main body side plates and is engaged with the corresponding locking ring set at the front end of the inner wall of the other main body. The inner wall of the mica plate 2 is provided with an inner partition 10. The inner partition 10, together with the mica plate 2 and the thin mica plate 3, seals the electromagnetic coil 5, insulation cotton 6, and radiation-shielding material 7.

[0054] In embodiments two, three, and four above, the hinge structure of the electromagnetic heating body is that one side of the two L-shaped structures is fixed by a detachable buckle, and the other side is fixed by a combination of locks 9. This invention adopts this flip-fold hinge structure, which can greatly reduce the difficulty of installation and disassembly.

[0055] This invention also discloses an electromagnetic heating device for a two-screw twin-screw extruder, the electromagnetic heating device comprising an electromagnetic heating body 1, a support 11, and an electromagnetic heater 13, as shown below. Figure 11 ,

[0056] The electromagnetic heating body 1 adopts the electromagnetic heating body described above;

[0057] The outer wall of the mica plate 2 of the electromagnetic heating body 1 is provided with an insert hinge. One side plate of the support 11 is provided with a pin that is inserted into the hinge insertion hole of the outer wall of the mica plate 2. The other side plate of the support 11 is provided with a support buckle 12 that is engaged with the corresponding locking ring on the outer wall of the mica plate 2 to fix the support 11 to the outer wall of the mica plate 2.

[0058] The electromagnetic heater 13 has a screw hole on its back, and the support 11 also has a corresponding screw hole. The screw passes through the hole on the support 11 and is screwed into the screw hole on the back of the electromagnetic heater 13 to fix the electromagnetic heater 13 to the support 11.

[0059] The mica plate 2 has a wire outlet hole 16. The electromagnetic coil 5 passes through the mica plate 2, through the wire outlet hole on the side of the support 11, and connects to the electromagnetic heater 13. The electromagnetic heater 13 controls different numbers of coils for heating according to the four structures of the heating equipment. For example, it controls four sets of coils connected in series on four sides of the electromagnetic heating body in a conventional structure; it controls three sets of coils connected in series on three sides of the electromagnetic heating body in an upper-opening and side-opening structure; and it controls two sets of coils connected in series on two sides of the electromagnetic heating body in an upper-opening and side-opening structure. The electromagnetic heater of this invention is placed on the side of the heating equipment, making operation convenient, avoiding interference from wires, and improving control accuracy.

[0060] The present invention also discloses an electromagnetic heating system for a two-part twin-screw extruder barrel, characterized in that the electromagnetic heating system includes an electromagnetic heating device and a die barrel 14 fixed in a through hole in the middle of the electromagnetic heating body.

[0061] The mold barrel 14 is I-shaped, with its central recess located in the through hole in the middle of the electromagnetic heating body 1, and its two protruding ends located outside the electromagnetic heating body 1 and having a flange structure. Multiple mold barrels 14 are connected and fixed in series through the flanges at their two ends.

[0062] The electromagnetic heating device described above is used, and its number is the same as the number of the plurality of mold cylinders 14. The electromagnetic heating body 1 of each electromagnetic heating device covers the outside of the recessed portion of the mold cylinder 14 in a one-to-one correspondence, and heats the mold cylinder 14 under the control of the electromagnetic heater 13. Figure 12-15 .

[0063] The flange connections of the multiple series-connected and fixed mold barrels 14 are externally fitted with U-shaped insulation covers 15. The width of the insulation cover 15 is equal to the width of the flange at the connection of two mold barrels 14, and the thickness of its U-shaped bottom is equal to the height from the top of the flange to the top surface of the electromagnetic heating body 1. When the insulation cover 15 is fitted at the flange connection, it fills the gaps between the electromagnetic heating bodies 1, making it a flush whole with the electromagnetic heating bodies. Figure 18-19 .

[0064] The U-shaped heat insulation cover 15 has a three-sided heat insulation structure composed of mica plates 2', and its interior is filled with heat insulation cotton 6'. The innermost side is sealed with a thin mica plate 3' to the heat insulation cotton 6'. Figure 16-17 .

[0065] During assembly, multiple mold cylinders are first fixedly connected by flanges at both ends. Then, the electromagnetic heating body is fixed to the recessed part of the mold cylinder by hinges and locking devices. Finally, the insulation cover is fastened to the flange connection of the multiple mold cylinders. The overall result is flat and aesthetically pleasing. Each electromagnetic heating body can be adjusted independently and precisely controlled by a temperature measuring device. The heating and insulation effects are good, effectively improving product quality and greatly reducing ambient temperature and electromagnetic radiation, resulting in better environmental protection.

[0066] The above are merely preferred embodiments of the present invention and do not limit the scope of the patent. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. An electromagnetic heating system for a two-part twin-screw extruder barrel, the electromagnetic heating system comprising an electromagnetic heating device and multiple die barrels heated by the electromagnetic heating device, characterized in that, The electromagnetic heating device includes an electromagnetic heating body, a support, and an electromagnetic heater. The number of electromagnetic heating devices is the same as the number of multiple mold cylinders, and the electromagnetic heating bodies in each device cover the exterior of the recessed portion of the mold cylinder, heating the mold cylinder under the control of the electromagnetic heater. The electromagnetic heating body consists of two L-shaped main bodies hinged together to form a rectangular structure. A through-hole is opened in the center of the rectangular structure to serve as a housing for the mold barrel. The outer shell of the electromagnetic heating body is assembled from mica sheets using corner brackets. Its inner surface is lined with radiation-shielding material, and insulation cotton is laid inside the radiation-shielding material. An electromagnetic coil is placed on top of the insulation cotton. A thin mica sheet seals the electromagnetic coil, insulation cotton, and radiation-shielding material on the innermost side. The electromagnetic coil extends from the mica sheet and is electrically connected to the electromagnetic heater. The electromagnetic coil is laid on the inner surface of the insulation cotton, as well as on the top, side, and left and right sides. The outer wall of the mica plate of the electromagnetic heating body shell is equipped with an insert hinge. One side plate of the support is equipped with a pin that is inserted into the hinge hole on the outer wall of the mica plate. The other side plate of the support is equipped with a support lock that engages with a corresponding locking ring on the outer wall of the mica plate to fix the support to the outer wall of the mica plate. The electromagnetic heater has a screw hole on its back, and the support also has a corresponding screw hole. The screw passes through the hole on the support and is screwed into the screw hole on the back of the electromagnetic heater to fix the electromagnetic heater to the support. The mold barrel is I-shaped, with its central recess located in the through hole in the middle of the electromagnetic heating body, and its two protruding ends located outside the electromagnetic heating body and having a flange structure. Multiple mold barrels are connected and fixed in series through the flanges at both ends. Using a single electromagnetic coil, the main body is laid on the surface of the insulation cotton, while the top and left / right sides extending beyond the surface of the insulation cotton are folded at 90° and laid on the top and left / right sides of the insulation cotton. Alternatively, multiple sets of coils can be laid on the inner surface of the insulation cotton, as well as on the top side and the left and right sides, and the multiple sets of coils can be connected in series or in parallel to achieve overall or independent control of each set of electromagnetic coils. A U-shaped heat insulation cover is fitted around the flange connection of multiple series-fixed mold barrels. The width of the heat insulation cover is equal to the width of the flange at the connection of two mold barrels, and the thickness of the bottom of the U-shape is equal to the height from the top of the flange to the top surface of the electromagnetic heating body. When the heat insulation cover is fitted around the flange connection, it fills the gap between the electromagnetic heating bodies to make it a flat whole with the electromagnetic heating bodies. The U-shaped insulation cover shell is a three-sided insulation structure composed of mica panels, with insulation cotton filled inside, and the innermost side is sealed with a thin mica panel.

2. The electromagnetic heating system for the barrel of a two-screw twin-screw extruder according to claim 1, characterized in that, The outer shell of the electromagnetic heating body is provided with a temperature detection hole. The position of the temperature detection hole is consistent with the hole positions on the radiation shielding material, insulation cotton and inner thin mica plate, and is coaxial with the temperature detection hole of the mold barrel. The surface of the mica plate of the electromagnetic heating body is provided with a temperature detection structure. The temperature detection structure is electrically connected to the electromagnetic heater. It is set with a corresponding temperature value. If the set value is exceeded, a signal is fed back to the electromagnetic heater to alarm and stop working.

3. The electromagnetic heating system for the barrel of a two-screw twin-screw extruder according to claim 1, characterized in that, The electromagnetic heating body consists of two L-shaped main bodies hinged together to form a rectangular structure. The upper surface of one of the L-shaped main bodies is hollowed out, and the other three sides are respectively covered with radiation-proof material, heat insulation cotton, electromagnetic coil and thin mica plate. The latch is set at the front end of the two side plates of the hollowed-out main body and engages with the locking ring set on the corresponding side wall of the other main body. The inner wall of the mica plate is provided with an inner partition, and the inner partition, together with the mica plate and the thin mica plate, seals the electromagnetic coil, heat insulation cotton and radiation-proof material.

4. The electromagnetic heating system for the barrel of a two-screw twin-screw extruder according to claim 1, characterized in that, The electromagnetic heating body consists of two L-shaped main bodies hinged together to form a rectangular structure. The rear plane of one of the L-shaped main bodies is hollowed out, while the other three sides are respectively covered with radiation-proof material, insulation cotton, electromagnetic coil, and thin mica plate. The latches are set at the front end of the two side plates of the hollowed-out main body and engage with the locking rings set on the corresponding side wall of the other main body. The inner wall of the mica plate is provided with an inner partition, which, together with the mica plate and the thin mica plate, seals the electromagnetic coil, insulation cotton, and radiation-proof material.

5. The electromagnetic heating system for the barrel of a two-screw twin-screw extruder according to claim 1, characterized in that, The electromagnetic heating body consists of two L-shaped main bodies hinged together to form a rectangular structure. The upper plane of one L-shaped main body is hollowed out, and the rear plane of the other main body is hollowed out. The other two sides of the electromagnetic heating body are respectively covered with radiation-proof material, heat insulation cotton, electromagnetic coil and thin mica plate. The latch is set at the front end of the inner wall of the two side plates of the hollowed-out main body, and it is engaged with the locking ring set at the front end of the inner wall of the other main body. The inner wall of the mica plate is provided with an inner partition, and the inner partition, together with the mica plate and the thin mica plate, seals the electromagnetic coil, heat insulation cotton and radiation-proof material.

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