Plasticizing unit of screw extruder

Abstract

The utility model discloses a plasticizing unit of a screw extruder, and particularly relates to the field of screw extruders, which comprises a shell, one end of the shell is connected with a driving box, the top of the shell is provided with a feed hopper and a liquid supplementing pipe, the middle wall body of the shell is fixedly connected with a heat conducting plate, and the outer surface of the shell is fixedly connected with a heat insulating plate. The outer surface of the heat conduction plate is sleeved with a plurality of electric heating ring plates and heat conduction rings, and temperature sensors are arranged at the tops of the heat conduction rings. According to the utility model, the electric heating box is used for controlling the electric heating tube and the electric heating ring plate to heat simultaneously, so that raw materials between the screw rod and the shell can be heated simultaneously from inside to outside, the raw materials are heated uniformly, the heating rate of the raw materials is improved, and the plasticizing efficiency of the raw materials is improved; the screw is heated by the electric heating tube, and raw materials are indirectly heated, so that coking caused by high temperature due to direct contact with the raw materials can be reduced, and the working efficiency and the output quality are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of screw extruders, and more specifically to a plasticizing unit of a screw extruder. Background Art

[0002] Extruder is one of the types of plastic machinery. Screw extruder is an automatic feeding equipment, which is divided into cold feed screw extruder and hot feed screw extruder. Both are used to extrude rubber semi-finished products and finished products. Plasticization refers to the whole process of plastics being heated in the barrel to reach a flowing state and have good plasticity. The plasticizing unit refers to the plasticizing heating structure inside the screw extruder used to heat and move the raw materials.

[0003] In order to maintain the plasticized state of the internal raw materials, the plasticizing unit in the existing screw extruder usually heats the internal raw materials of the extruder from the inner wall of the extruder pipe. The heat of the raw materials is transmitted from the outside to the inside, so that the outside of the raw materials is plasticized first, and then the inside is gradually plasticized. It is easy for the raw materials to be heated unevenly due to uneven heating, thereby affecting the plasticization effect, and it is easy for the raw materials in some areas to solidify and adhere to the screw, and the raw materials in some areas to be coked due to high temperature, thereby reducing the working efficiency and output quality of the extruder. Utility Model Content

[0004] In order to overcome the above defects of the prior art, the utility model provides a screw extruder plasticizing unit to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a screw extruder plasticizing unit, comprising a shell, one end of the shell is connected to a drive box, a feed hopper and a liquid replenishing tube are arranged on the top of the shell, a heat conducting plate is fixedly connected to the middle wall of the shell, a heat insulating plate is fixedly connected to the outer surface of the shell, and a plurality of electric heating ring plates and heat conducting rings are sleeved on the outer surface of the heat conducting plate;

[0006] A temperature sensor is arranged on the top of the heat-conducting ring, wherein a temperature measuring meter is arranged on the top of one of the temperature sensors, a screw is arranged in the middle of the shell, an electric heating tube is arranged in the middle of the screw, an electric heating box and a motor are arranged in the middle of the driving box, a second transmission gear is connected to the output end of the motor, and a first transmission gear is fixedly sleeved on one end of the screw.

[0007] Preferably, a preheating plate is provided at the center of the middle wall of the feed hopper, and the inner cavity of the feed hopper is connected to the inner cavity of the outer shell.

[0008] Preferably, a sealing cover is provided on the top of the liquid infusion tube, and the electric heating box is electrically connected to the electric heating ring plate, the preheating plate and the electric heating tube.

[0009] Preferably, the wall of the heat conducting plate is in contact with the wall of the electric heating ring plate and the heat conducting ring, and the heat conducting ring is located between two adjacent electric heating ring plates.

[0010] Preferably, the first transmission gear is arranged in the middle of the driving box, the first transmission gear is located directly below the second transmission gear, and the first transmission gear and the second transmission gear are meshed.

[0011] Preferably, the liquid infusion tube, the heat-conducting ring and the electric heating ring plate are mutually offset, and one end of the housing away from the driving box is fixedly connected with a connecting flange.

[0012] Technical effects and advantages of the utility model:

[0013] 1. The utility model firstly controls the electric heating tube and the electric heating ring plate to heat simultaneously through the electric heating box, so that the heating process of the raw material between the screw and the shell can be carried out simultaneously from the inside and the outside, so that the raw material is heated evenly, and the heating rate of the raw material is improved, thereby improving the plasticization efficiency of the raw material. The electric heating ring plate heats the heat conducting plate, and the electric heating tube heats the screw, and indirectly realizes the heating of the raw material, which can reduce the coking caused by high temperature due to direct contact with the raw material, and improve the work efficiency and output quality;

[0014] 2. The utility model also controls the second transmission gear to drive the first transmission gear to rotate by starting the motor, so that the screw can rotate without affecting the movement and extrusion of the raw material, and transmits the temperature of the raw material through the heat-conducting ring, and detects the temperature of the heat-conducting ring through the temperature sensor, thereby indirectly realizing the detection of the temperature of the raw material, facilitating detection and control, and the temperature of the extrusion end can be observed in real time through the temperature measuring meter, and by controlling the heating efficiency of different electric heating ring plate positions, the raw materials at different positions can be heated and plasticized, thereby improving the plasticization effect and uniformity of plasticization, and improving the use effect;

[0015] In summary, through the mutual influence of the above-mentioned multiple effects, it is possible to achieve simultaneous internal and external heating of the raw materials, so that the raw materials are heated evenly, the heating rate of the raw materials is increased, thereby improving the plasticization efficiency of the raw materials, and realizing indirect heating, which can reduce the coking caused by high temperature due to direct contact with the raw materials, thereby improving work efficiency and output quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the overall structure of the utility model.

[0017] Figure 2 It is a schematic diagram of the cross-sectional structure of the shell of the utility model.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model.

[0019] Figure 4It is a schematic diagram of the cross-sectional structure of the housing and the screw of the utility model.

[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the shell of the utility model.

[0021] The accompanying drawings are marked as follows: 1. outer casing; 2. drive box; 3. feed hopper; 4. liquid replenishing pipe; 5. connecting flange; 6. end cover; 7. heat transfer plate; 8. heat insulation plate; 9. preheating plate; 10. electric heating ring plate; 11. heat transfer ring; 12. temperature sensor; 13. temperature measuring meter; 14. screw; 15. electric heating tube; 16. electric heating box; 17. first transmission gear; 18. second transmission gear; 19. motor. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0023] As attached Figure 1-5 The screw extruder plasticizing unit shown includes a shell 1, one end of the shell 1 is connected to a drive box 2, a feed hopper 3 and a liquid replenishing tube 4 are arranged on the top of the shell 1, which are convenient for adding raw materials and supplementing additives required for plasticizing, a heat conducting plate 7 is fixedly connected to the middle wall of the shell 1, which can improve the uniformity of heating, and a heat insulating plate 8 is fixedly connected to the outer surface of the shell 1 to avoid burns on the outer surface, and the outer surface of the shell 1 can be protected, and the outer surface of the heat conducting plate 7 is sleeved with a plurality of electric heating ring plates 10 and heat conducting rings 11, and the heat conducting plate 7 can be heated by the electric heating ring plates 10 to improve the heating effect, and the heat conducting rings 11 can play a role in temperature conduction;

[0024] A temperature sensor 12 is provided on the top of the heat-conducting ring 11, and a thermometer 13 is provided on the top of one of the temperature sensors 12. A screw 14 is provided in the middle of the shell 1, and an electric heating pipe 15 is provided in the middle of the screw 14. An electric heating box 16 and a motor 19 are provided in the middle of the drive box 2. The output end of the motor 19 is connected to a second transmission gear 18, and one end of the screw 14 is fixedly sleeved with a first transmission gear 17. The surface temperature of the heat-conducting ring 11 can be detected by the temperature sensor 12, so as to detect the temperature of the raw material inside the heat-conducting plate 7, which is convenient for detection and control. The temperature of the raw material after plasticization can be detected by the thermometer 13, which is convenient for control. The screw 14 can be heated by the set electric heating pipe 15, so that the raw material in the middle of the shell 1 is heated from the inside through the screw 14 to improve the heating effect. By starting the motor 19 to control the rotation of the second transmission gear 18, the first transmission gear 17 can be controlled to drive the screw 14 to rotate, thereby realizing the extrusion effect.

[0025] As attached Figure 2-5 As shown, a preheating plate 9 is provided in the middle of the middle wall of the feed hopper 3, and the inner cavity of the feed hopper 3 is connected with the inner cavity of the outer shell 1. The preheating plate 9 can preheat the raw materials added into the inner part of the outer shell 1 through the feed hopper 3 to improve the heating and plasticizing effect.

[0026] As attached Figure 1-4 As shown, a sealing cover 6 is provided on the top of the infusion tube 4, and the electric heating box 16 is electrically connected to the electric heating ring plate 10, the preheating plate 9 and the electric heating tube 15. The sealing cover 6 can be used to seal the infusion tube 4, which can avoid temperature diffusion during plasticization and play an anti-blocking role. The electric heating box 16 can control the heating of the electric heating tube 15 and the electric heating ring plate 10 to achieve simultaneous heating of the raw materials in the middle of the shell 1 from the inside and outside, thereby improving the use effect.

[0027] As attached Figure 1-5 As shown, the wall of the heat conducting plate 7 is in contact with the wall of the electric heating ring plate 10 and the heat conducting ring 11, and the heat conducting ring 11 is located between two adjacent electric heating ring plates 10. The heat conducting plate 7 is heated by the electric heating ring plate 10 and the heat conducting ring 11, and the raw materials can be heated synchronously by the heat conducting plate 7, thereby improving the heating efficiency and heating uniformity and improving the use effect.

[0028] As attached Figure 2-4 As shown, the first transmission gear 17 is arranged in the middle of the driving box 2, and the first transmission gear 17 is located directly below the second transmission gear 18. The first transmission gear 17 and the second transmission gear 18 are meshed with each other. The starting motor 19 controls the rotation of the second transmission gear 18, and the first transmission gear 17 can be controlled to drive the screw 14 to rotate, which is convenient for extrusion.

[0029] As attached Figure 2-4As shown, the refilling tube 4 is offset from the heat-conducting ring 11 and the electric heating ring plate 10, and the end of the housing 1 away from the driving box 2 is fixedly connected with a connecting flange 5. The refilling tube 4 can be used to supplement additives while heating, which is convenient to use.

[0030] Working principle of the utility model: when in use, the electric heating box 16 controls the electric heating tube 15 and the electric heating ring plate 10 to heat simultaneously, the electric heating tube 15 can heat the screw 14, and the electric heating ring plate 10 can heat the heat conducting plate 7, so as to realize the uniform heating of the raw materials at different positions inside the shell 1 from the inside and outside at the same time, improve the uniformity of heating, and then improve the plasticizing effect of the raw materials, and the preheating plate 9 can preliminarily preheat the raw materials added in, so as to improve the plasticizing efficiency;

[0031] Secondly, the heat conducting plate 7 can transfer the heat to the surface of the heat conducting ring 11 after absorbing it. The temperature of the heat conducting ring 11 can be detected by the temperature sensor 12 to monitor the temperature of the internal raw materials. By adjusting the heating temperature of the electric heating ring plate 10 at different positions, the heating and plasticizing effect of the raw materials at different positions can be changed, which is convenient for adjustment and control. The plasticizing temperature at the discharge port position can be monitored in real time by the temperature measuring meter 13, which is convenient for detection and control.

[0032] By starting the motor 19 to control the second transmission gear 18 to drive the first transmission gear 17 to rotate the screw 14, the normal raw material conveying and extrusion of the screw extruder can be not affected, thereby improving the use effect.

[0033] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw extruder plasticizing unit, comprising a housing (1), characterized in that: One end of the shell (1) is connected to a driving box (2), a feed hopper (3) and a liquid replenishing tube (4) are arranged on the top of the shell (1), a heat conducting plate (7) is fixedly connected to the middle wall of the shell (1), a heat insulating plate (8) is fixedly connected to the outer surface of the shell (1), and a plurality of electric heating ring plates (10) and heat conducting rings (11) are sleeved on the outer surface of the heat conducting plate (7); A temperature sensor (12) is arranged on the top of the heat-conducting ring (11), wherein a temperature meter (13) is arranged on the top of one of the temperature sensors (12); a screw rod (14) is arranged in the middle of the housing (1), an electric heating pipe (15) is arranged in the middle of the screw rod (14); an electric heating box (16) and a motor (19) are arranged in the middle of the drive box (2); an output end of the motor (19) is connected to a second transmission gear (18), and one end of the screw rod (14) is fixedly sleeved with a first transmission gear (17).

2. The screw extruder plasticizing unit according to claim 1, characterized in that: A preheating plate (9) is provided in the middle of the middle wall of the feed hopper (3), and the inner cavity of the feed hopper (3) is connected to the inner cavity of the outer shell (1).

3. The screw extruder plasticizing unit according to claim 1, characterized in that: The top of the liquid infusion tube (4) is provided with an end cap (6), and the electric heating box (16) is electrically connected to the electric heating ring plate (10), the preheating plate (9), and the electric heating tube (15).

4. The screw extruder plasticizing unit according to claim 1, characterized in that: The wall of the heat-conducting plate (7) fits the wall of the electric heating ring plate (10) and the heat-conducting ring (11), and the heat-conducting ring (11) is located between two adjacent electric heating ring plates (10).

5. The screw extruder plasticizing unit according to claim 1, characterized in that: The first transmission gear (17) is arranged in the middle of the driving box (2); the first transmission gear (17) is located directly below the second transmission gear (18); the first transmission gear (17) and the second transmission gear (18) are meshed.

6. The screw extruder plasticizing unit according to claim 1, characterized in that: The liquid infusion tube (4) is offset from the heat-conducting ring (11) and the electric heating ring plate (10), and a connecting flange (5) is fixedly connected to one end of the housing (1) away from the drive box (2).

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