A screw extruder capable of uniformly heating a material

Abstract

The utility model relates to extruder technical field discloses a screw extruder that can even heat material, including support frame, the inner wall fixed connection of support frame has the feed pipe. The utility model discloses through setting up spiral blade, and the material is put into the feed pipe from the feeding port, and the motor drives screw rotation, and the spiral blade transports material, and gradually increasing the pitch makes the material when initial flow, and gas or volatile matter can more smoothly discharge, reduces the bubble or interstice in finished product, improved the compactness of product, and the friction between spiral blade and material is reduced with the larger pitch, thereby reduces the resistance, avoids the retention or blockage of material, then the spiral blade and conical discharge port cooperate with each other, and the material passageway is gradually tightened, and the pitch gradually becomes small, and the material is extruded between the spiral blade, and the compression degree increases, and the bubble in the gap is extruded, guarantees the structure compactness degree of extruded material, improves the practicality of device.

Description

Technical Field

[0001] This utility model relates to the field of extruder technology, and in particular to a screw extruder capable of uniformly heating materials. Background Technology

[0002] Extruders are widely used in the fields of plastics and rubber, mainly for mixing, extrusion, and molding processes. Based on the angle between the material flow direction at the die head and the screw centerline, extruders can be divided into right-angle die heads and angled die heads. Screw extruders rely on the pressure and shear force generated by the rotation of the screw to fully plasticize and uniformly mix the material, which is then formed through a die. Plastic extruders can be basically classified into twin-screw extruders, single-screw extruders, and less common multi-screw extruders and screwless extruders.

[0003] Publication number CN217670982U discloses a heating device for a single-screw extruder, including a base plate, a heating assembly on the upper part of the base plate, the heating assembly including a mounting plate, a plurality of mounting holes on the upper part of the mounting plate, the mounting plate being detachably mounted on the upper part of the base plate by means of bolts and mounting holes, a support plate being fixedly connected to the upper part of the mounting plate, a first heating clamp being fixedly connected to the upper part of the support plate, a second heating clamp being detachably mounted on the upper part of the first heating clamp by means of another bolt, the second heating clamp being electrically connected to the first heating clamp.

[0004] Although the device allows for the detachable mounting plate via bolts and mounting holes, enabling adjustment of the spacing between different heating components, and a support plate fixedly connected to the upper part of the mounting plate, with a first heating clamp fixedly connected to the upper part of the support plate, and a second heating clamp detachably mounted on the upper part of the first heating clamp via another bolt, and the second heating clamp is electrically connected to the first heating clamp, allowing for easy disassembly and replacement of the heating components if they are damaged, the heating components are exposed to the outside, causing a large portion of the heat to dissipate into the environment, preventing full utilization of heating. Furthermore, the equal-pitch screw may not be able to ensure the material is compact when pushing it, resulting in air bubbles inside the material and affecting the quality of the finished product. Utility Model Content

[0005] To solve the above-mentioned technical problems, this utility model provides a screw extruder that can uniformly heat materials.

[0006] This utility model is achieved by the following technical solution: a screw extruder capable of uniformly heating materials, including a support frame, a feeding pipe fixedly connected to the inner wall of the support frame, a feeding port fixedly connected to the top of the feeding pipe, a feeding mechanism provided on the surface of the support frame, a temperature control mechanism provided on the surface of the feeding pipe, and a conical discharge port fixedly connected to the end of the feeding pipe away from the feeding port. The material conveying mechanism includes a motor, the output end of which is fixedly connected to a screw, and the surface of the screw is fixedly connected to a spiral blade.

[0007] As a further improvement to the above solution, the surface of the motor is fixedly connected to the surface of the support frame, and the surface of the screw is rotatably connected to the inner wall of the conveying pipe.

[0008] As a further improvement to the above scheme, the surface of the spiral blade is rotatably connected to the inner wall of the conveying pipe, the surface of the spiral blade is rotatably connected to the inner wall of the conical discharge port, the spiral blade pitch at both ends of the screw is relatively dense, and the spiral blade pitch in the middle of the screw is relatively loose.

[0009] Through the above technical solution, by setting up spiral blades, the material is fed into the conveying pipe from the feeding port. The motor drives the screw to rotate, and the spiral blades convey the material. The gradually increasing screw pitch allows gas or volatiles to be discharged more smoothly during the initial flow of the material, reducing air bubbles or voids in the finished product and improving the density of the product. At the same time, the larger screw pitch reduces the friction between the spiral blades and the material, thereby reducing resistance and avoiding material retention or blockage. Then, the spiral blades and the conical discharge port work together to gradually tighten the material channel and gradually reduce the screw pitch. The material is squeezed between the spiral blades, increasing the degree of compression and squeezing out air bubbles in the gaps, ensuring the compactness of the extruded material and improving the practicality of the device.

[0010] As a further improvement to the above solution, the temperature control mechanism includes an insulated water tank, a heating tube fixedly connected to the inner wall of the insulated water tank, a water inlet fixedly connected to the top of the insulated water tank, a first cover slidably connected to the inner wall of the water inlet, a water outlet fixedly connected to the bottom of the insulated water tank, a second cover fixedly connected to the inner wall of the water outlet, a cooling water tank fixedly connected to the surface of the conical discharge port, a water outlet pipe fixedly connected to the top of the cooling water tank, a water inlet pipe fixedly connected to the bottom of the cooling water tank, and a circulating water pump fixedly connected to the end of the water outlet pipe away from the cooling water tank.

[0011] The above technical solution involves setting up a cooling water tank, which exchanges heat with the contact surface of the conical discharge port, helping the molten material to cool rapidly after extrusion, ensuring that the material can be stably shaped and achieve the predetermined physical properties.

[0012] As a further improvement to the above solution, the inner wall of the insulated water tank is fixedly connected to the surface of the conveying pipe.

[0013] Through the above technical solution, by setting up an insulated water tank, the heating pipe heats the water inside the insulated water tank, and the contact surface between the insulated water tank and the conveying pipe exchanges heat, so as to uniformly heat the material inside the conveying pipe. At the same time, the outer wall of the insulated water tank has a double-layer structure with a hollow layer in the middle, which blocks the heat loss path, greatly slows down the heat exchange between the insulated water tank and the external environment, and ensures the heat utilization rate.

[0014] As a further improvement to the above solution, the output end of the circulating water pump is fixedly connected to the end of the inlet pipe away from the cooling water tank.

[0015] As a further improvement to the above solution, the outlet pipe and inlet pipe are made of copper pipes.

[0016] The above technical solution involves setting up a circulating water pump. Cooling water that has absorbed heat enters the outlet pipe, where it undergoes a brief cooling process due to the fast thermal conductivity of copper before being pumped back into the circulating water pump. The circulating water pump then delivers the water to the inlet pipe for another brief cooling, before sending it into the cooling water tank. This process pushes the relatively hot cooling water, which has absorbed heat, to the outlet pipe for water circulation, preventing the cooling water in the tank from continuously absorbing heat and affecting the cooling effect.

[0017] Compared with the prior art, the beneficial effects of this utility model are as follows: This invention utilizes a feeding mechanism, specifically a spiral blade, to feed material into a feeding pipe from the inlet. A motor drives the screw to rotate, and the spiral blade transports the material. The gradually increasing screw pitch allows for smoother discharge of gases or volatiles during the initial flow of the material, reducing air bubbles or voids in the finished product and improving its density. Simultaneously, the larger pitch reduces friction between the spiral blade and the material, thus reducing resistance and preventing material stagnation or blockage. Then, the spiral blade and the conical outlet work together to gradually tighten the material channel, while the screw pitch gradually decreases. The material is compressed between the spiral blades, increasing the degree of compression and squeezing out air bubbles from the gaps, ensuring the compactness of the extruded material and improving the device's practicality.

[0018] This invention employs a temperature control mechanism, specifically an insulated water tank. A heating element heats the water inside the insulated water tank, and the contact surface between the insulated water tank and the conveying pipe exchanges heat, ensuring uniform heating of the material inside the conveying pipe. The outer wall of the insulated water tank has a double-layer structure with a hollow layer in between, blocking heat loss and significantly slowing down heat exchange between the insulated water tank and the external environment, thus ensuring efficient heat utilization. A cooling water tank is also included, where heat exchange occurs between the contact surface of the cooling water tank and the conical discharge port, helping to rapidly cool the molten material after extrusion, ensuring stable molding and achieving the desired physical properties. A circulating water pump directs the cooled water, which absorbs heat, into the outlet pipe. Utilizing the rapid thermal conductivity of copper, the water undergoes a brief cooling process before being pumped back into the circulating water pump. The circulating water pump then delivers the water to the inlet pipe for another brief cooling before sending it into the cooling water tank. This process pushes the relatively hot cooled water, after absorbing heat, to the outlet pipe for water circulation, preventing the cooling water in the tank from continuously absorbing heat and affecting the cooling effect. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a side view of the structure of this utility model; Figure 3 This is a top view of the structure of this utility model; Figure 4 This is a schematic cross-sectional view of the present invention. Figure 5 This is a cross-sectional structural diagram of the present invention.

[0020] Explanation of key symbols: 1. Support frame; 2. Feeding pipe; 3. Feeding port; 4. Feeding mechanism; 401. Motor; 402. Screw; 403. Spiral blade; 5. Temperature control mechanism; 501. Insulated water tank; 502. Heating tube; 503. Water inlet; 504. First cover; 505. Water outlet; 506. Second cover; 507. Cooling water tank; 508. Water outlet pipe; 509. Water inlet pipe; 510. Circulating water pump; 6. Conical discharge port. Detailed Implementation

[0021] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments. Example

[0022] Please combine Figure 1-5The screw extruder of this embodiment, which can uniformly heat materials, includes a support frame 1, a feeding pipe 2 fixedly connected to the inner wall of the support frame 1, a feeding port 3 fixedly connected to the top of the feeding pipe 2, a feeding mechanism 4 provided on the surface of the support frame 1, a temperature control mechanism 5 provided on the surface of the feeding pipe 2, and a conical discharge port 6 fixedly connected to the end of the feeding pipe 2 away from the feeding port 3. The material conveying mechanism 4 includes a motor 401, a screw 402 is fixedly connected to the output end of the motor 401, and a spiral blade 403 is fixedly connected to the surface of the screw 402.

[0023] The surface of the motor 401 is fixedly connected to the surface of the support frame 1, and the surface of the screw 402 is rotatably connected to the inner wall of the conveying pipe 2.

[0024] The surface of the spiral blade 403 is rotatably connected to the inner wall of the conveying pipe 2, and the surface of the spiral blade 403 is rotatably connected to the inner wall of the conical discharge port 6. The spiral blades 403 at both ends of the screw 402 have a denser pitch, while the spiral blades 403 in the middle of the screw 402 have a looser pitch. The spiral blades 403 feed the material from the feed port 3 into the conveying pipe 2. The motor 401 drives the screw 402 to rotate, and the spiral blades 403 convey the material. The gradually increasing pitch allows gas or volatiles to be discharged more smoothly during the initial flow of the material, reducing air bubbles or voids in the finished product and improving the density of the product. At the same time, the larger pitch reduces the friction between the spiral blades 403 and the material, thereby reducing resistance and avoiding material retention or blockage. Then, the spiral blades 403 and the conical discharge port 6 cooperate with each other, the material channel gradually tightens, the pitch gradually decreases, and the material is squeezed between the spiral blades 403, increasing the degree of compression and squeezing out air bubbles in the gaps, ensuring the compactness of the extruded material structure.

[0025] The temperature control mechanism 5 includes an insulated water tank 501, a heating tube 502 fixedly connected to the inner wall of the insulated water tank 501, a water inlet 503 fixedly connected to the top of the insulated water tank 501, a first cover 504 slidably connected to the inner wall of the water inlet 503, a water outlet 505 fixedly connected to the bottom of the insulated water tank 501, a second cover 506 fixedly connected to the inner wall of the water outlet 505, a cooling water tank 507 fixedly connected to the surface of the conical discharge port 6, the contact surface between the cooling water tank 507 and the conical discharge port 6 exchanges heat to help the molten material cool down quickly after extrusion, ensuring that the material can be stably formed and achieve the predetermined physical properties, a water outlet pipe 508 fixedly connected to the top of the cooling water tank 507, a water inlet pipe 509 fixedly connected to the bottom of the cooling water tank 507, and a circulating water pump 510 fixedly connected to the end of the water outlet pipe 508 away from the cooling water tank 507.

[0026] The inner wall of the insulated water tank 501 is fixedly connected to the surface of the conveying pipe 2. The heating pipe 502 heats the water inside the insulated water tank 501. The contact surface between the insulated water tank 501 and the conveying pipe 2 exchanges heat, and the material inside the conveying pipe 2 is heated evenly. At the same time, the outer wall of the insulated water tank 501 has a double-layer structure with a hollow layer in the middle, which blocks the heat loss path and greatly slows down the heat exchange between the insulated water tank 501 and the external environment, ensuring the heat utilization rate.

[0027] The output end of the circulating water pump 510 is fixedly connected to the end of the inlet pipe 509 that is away from the cooling water tank 507.

[0028] The outlet pipe 508 and the inlet pipe 509 are made of copper. The cooling water that has absorbed heat enters the outlet pipe 508. Utilizing the fast thermal conductivity of copper, it undergoes a brief heat dissipation before being pumped into the circulating water pump 510. The circulating water pump 510 delivers the water to the inlet pipe 509 for another brief cooling. Then, it is sent to the cooling water tank 507. The cooling water, which has absorbed heat and is relatively hot, is pushed to the outlet pipe 508 for water circulation, preventing the cooling water in the cooling water tank 507 from continuously absorbing heat and affecting the cooling effect.

[0029] The implementation principle of a screw extruder capable of uniformly heating materials in this application embodiment is as follows: During use, materials are fed into the feed pipe 2 through the feed inlet 3. The motor 401 drives the screw 402 to rotate, and the spiral blade 403 conveys the materials. The gradually increasing screw pitch allows gas or volatiles to be discharged more smoothly during the initial flow of the material, reducing air bubbles or voids in the finished product and improving the product's density. Simultaneously, the larger screw pitch reduces the friction between the spiral blade 403 and the material, thereby reducing resistance and preventing material retention or blockage. Meanwhile, the heating pipe 502 heats the water inside the insulated water tank 501, and heat exchange occurs between the insulated water tank 501 and the feed pipe 2, uniformly heating the material inside the feed pipe 2. Furthermore, the outer wall of the insulated water tank 501 has a double-layer structure with a hollow layer in between, blocking the heat loss path and significantly slowing down the heat exchange between the insulated water tank 501 and the external environment. To ensure efficient heat utilization, the spiral blades 403 and the conical discharge port 6 work together to gradually tighten the material channel and reduce the pitch. The material is squeezed between the spiral blades 403, increasing the degree of compression and squeezing out air bubbles from the gaps, ensuring the compactness of the extruded material structure. At the same time, the contact surface between the cooling water tank 507 and the conical discharge port 6 exchanges heat, helping the molten material to cool rapidly after extrusion, ensuring that the material can be stably formed and achieve the predetermined physical properties. The cooling water that has absorbed heat enters the outlet pipe 508, and after a brief cooling process using the fast thermal conductivity of copper, it is pumped into the circulating water pump 510. The circulating water pump 510 delivers the water to the inlet pipe 509 for another brief cooling, and then sends it into the cooling water tank 507. The relatively high-temperature cooling water after absorbing heat is pushed to the outlet pipe 508 for water circulation, preventing the cooling water in the cooling water tank 507 from continuously absorbing heat and affecting the cooling effect.

[0030] The above embodiments are merely preferred embodiments of this utility model and should not be construed as limiting the scope of protection of this utility model. Any non-substantial changes and substitutions made by those skilled in the art based on this utility model shall fall within the scope of protection claimed by this utility model.

Claims

1. A screw extruder capable of uniformly heating materials, characterized in that, Includes a support frame (1), the inner wall of the support frame (1) is fixedly connected to a conveying pipe (2), the top of the conveying pipe (2) is fixedly connected to a feeding port (3), the surface of the support frame (1) is provided with a conveying mechanism (4), the surface of the conveying pipe (2) is provided with a temperature control mechanism (5), and the end of the conveying pipe (2) away from the feeding port (3) is fixedly connected to a conical discharge port (6). The material conveying mechanism (4) includes a motor (401), the output end of which is fixedly connected to a screw (402), and the surface of the screw (402) is fixedly connected to a spiral blade (403).

2. The screw extruder capable of uniformly heating materials as described in claim 1, characterized in that: The surface of the motor (401) is fixedly connected to the surface of the support frame (1), and the surface of the screw (402) is rotatably connected to the inner wall of the conveying pipe (2).

3. The screw extruder capable of uniformly heating materials as described in claim 1, characterized in that: The surface of the spiral blade (403) is rotatably connected to the inner wall of the conveying pipe (2), and the surface of the spiral blade (403) is rotatably connected to the inner wall of the conical discharge port (6). The spiral blades (403) at both ends of the screw (402) have a denser pitch, while the spiral blades (403) in the middle of the screw (402) have a looser pitch.

4. The screw extruder capable of uniformly heating materials as described in claim 1, characterized in that: The temperature control mechanism (5) includes an insulated water tank (501), a heating tube (502) is fixedly connected to the inner wall of the insulated water tank (501), an inlet (503) is fixedly connected to the top of the insulated water tank (501), a first cover (504) is slidably connected to the inner wall of the inlet (503), an outlet (505) is fixedly connected to the bottom of the insulated water tank (501), a second cover (506) is fixedly connected to the inner wall of the outlet (505), a cooling water tank (507) is fixedly connected to the surface of the conical discharge port (6), an outlet pipe (508) is fixedly connected to the top of the cooling water tank (507), an inlet pipe (509) is fixedly connected to the bottom of the cooling water tank (507), and a circulating water pump (510) is fixedly connected to the end of the outlet pipe (508) away from the cooling water tank (507).

5. A screw extruder capable of uniformly heating materials as described in claim 4, characterized in that: The inner wall of the insulated water tank (501) is fixedly connected to the surface of the conveying pipe (2).

6. A screw extruder capable of uniformly heating materials as described in claim 4, characterized in that: The output end of the circulating water pump (510) is fixedly connected to the end of the inlet pipe (509) away from the cooling water tank (507).

7. A screw extruder capable of uniformly heating materials as described in claim 4, characterized in that: The outlet pipe (508) and inlet pipe (509) are made of copper.

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