Integrated double-screw extruder for loading, unloading and pressurizing

Abstract

The utility model discloses an integrated double-screw extruder for loading, unloading and pressurizing, which comprises an extruder base, an extrusion motor, a reduction gearbox, two extrusion screws, a plurality of heaters and an extrusion head, threads of the two extrusion screws are meshed with each other and are respectively connected onto two extrusion shafts of the reduction gearbox; two charging barrels are connected to the positions, located outside the two extrusion screws, of the front side wall of the reduction gearbox through bolts, the extrusion head is connected to the front side walls of the two charging barrels through bolts, and the multiple heaters are distributed in a linear array and embraced on the outer side walls of the two charging barrels. According to the utility model, the strip-shaped expansion bag and the pressure control film are expanded in a manner of introducing oil liquid, and materials discharged from the charging barrel and the hopper are pressurized in a manner of directly reducing the volumes of the hopper and the charging barrel, so that the material fluid is effectively pressurized, the stability of the materials is improved, the extrusion speed of the fluid is not influenced, and the production efficiency is improved. And the forming effect of the material is fully ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of screw extruders, in particular to an integrated twin-screw extruder for connection, unloading and pressurization. Background Art

[0002] An integrated twin-screw extruder is a screw extruder that integrates multiple functions into one unit. This type of equipment is usually used in fields such as plastic processing and polymer processing. Unlike traditional screw extruders, the integrated twin-screw extruder integrates multiple functions such as extrusion, mixing, feeding, exhaust, cooling, and cutting into one compact unit, thereby improving production efficiency and processing accuracy. In order to control material properties, the integrated twin-screw extruder can change the material's density, viscosity, melt strength and other properties by pressurizing, thereby meeting specific processing requirements.

[0003] However, in order to change the material properties, the existing integrated twin-screw extruders generally have the following ways to pressurize the fluid inside the extruder: 1. By increasing the speed of the screw, the shear force and pressure of the fluid can be increased, thereby achieving the effect of pressurization. However, although increasing the speed of the screw can quickly achieve the purpose of pressurizing the material, excessively fast or too slow a screw speed may cause abnormal extrusion molding of the material; 2. By changing the configuration of the screw, such as using denser threads or longer screws, the compression and pressure-boosting capabilities of the fluid can be increased. Although this method can pressurize the material, it will not cause abnormal material molding problems. The problem is that the application scope of the screw with special configuration is small and it cannot be put into use on a large scale; 3. By controlling the feed speed, the fluid can stay in the extruder for a longer time, thereby increasing the pressure. This method is more convenient and effective for pressurizing the material. However, since the material stays in the extruder for a long time and is subjected to excessive heat and mechanical stress, which causes the degradation of the material, the above three methods for pressurizing the material inside the extruder cannot change the material properties well while meeting the production efficiency. Based on the above reasons, technicians in this field have proposed an integrated twin-screw extruder for unloading and pressurization to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings existing in the prior art, and to propose an integrated twin-screw extruder for connection and unloading and pressurization. The integrated twin-screw extruder for connection and unloading and pressurization expands the strip expansion bag and the pressure control membrane by introducing oil, and pressurizes the barrel and the material discharged into the hopper by directly reducing the volume of the hopper and the barrel, effectively pressurizes the material fluid and improves the material stability, and will not affect the extrusion speed of the fluid, fully ensuring the molding effect of the material.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] An integrated twin-screw extruder for loading and unloading and pressurizing, comprising an extruder base, an extrusion motor, a reduction gearbox, two extrusion screws, a plurality of heaters and an extrusion head, wherein the threads of the two extrusion screws mesh with each other and are respectively connected to two extrusion shafts of the reduction gearbox, the front side wall of the reduction gearbox and the outside of the two extrusion screws are bolted to two barrels, the extrusion head is bolted to the front side walls of the two barrels, and the plurality of heaters are distributed in a linear array and embraced on the outer side walls of the two barrels;

[0007] A strip expansion bag is fixedly connected to the middle position of one side wall of the two barrels close to each other, and a connecting and unloading transformer assembly is installed at the right rear position of the upper side wall of the extruder base, and the connecting and unloading transformer assembly includes a plurality of control solenoid valves, a plurality of expansion oil pipes, a fuel tank, an oil pump and a heat preservation oil pipe. The oil pump is installed on the top of the fuel tank, and the input end of the oil pump passes through the fuel tank and reaches the bottom of the fuel tank through the oil pump pipe. The heat preservation oil pipe is connected to the output end of the oil pump. The heat preservation oil pipe is a disc-shaped structure, and the middle part of which is embedded in the contact surfaces on both sides of the two barrels. The other end of the heat preservation oil pipe passes through the left side wall of the fuel tank and reaches the bottom of the fuel tank. The plurality of expansion oil pipes are distributed in a linear array and pass through the upper and lower ends of the leftmost part of the heat preservation oil pipe. The plurality of control solenoid valves are arranged at the upper and lower ends of the plurality of heaters and are distributed in a linear array. The other ends of the plurality of expansion oil pipes are respectively connected to the input ends of the plurality of control solenoid valves, and the output ends of the plurality of control solenoid valves pass through the two barrels through connecting pipes and reach the inside of the two strip expansion bags.

[0008] Through the above technical scheme, the input shaft of the reduction box is driven to rotate by the extrusion motor, thereby driving the two extrusion screws to rotate rapidly. The middle part of the heat preservation oil pipe is embedded in the two barrels. The heated oil can improve the heating effect of the barrel and ensure the molding temperature of the fluid inside the barrel. When it is necessary to pressurize the material fluid stored in the two barrels, all control solenoid valves are opened, and the oil stored in the expansion oil pipes enters the two strip expansion bags through the control solenoid valves. The strip expansion bags begin to expand and squeeze the internal space of the two barrels. As the strip expansion bags expand, the inner cavity volume of the two barrels gradually decreases, so that the pressure of the material fluid stored in the two barrels increases, thereby changing the material properties. This method squeezes the material fluid by expansion, effectively pressurizes the material fluid, and does not affect the extrusion speed of the fluid, fully ensuring the molding effect of the material. By opening the frontmost control solenoid valve separately, the front end of the strip expansion bag can be controlled to expand, so that the fluid is pressurized before being extruded, thereby increasing the fluid extrusion amount.

[0009] Further, the extrusion motor is installed on the upper side wall of the extruder base and close to the rear side, the reduction box is installed on the upper side wall of the extruder base and is located directly in front of the extrusion motor, and the output shaft of the extrusion motor is connected to the input shaft of the reduction box through a coupling;

[0010] Through the above technical solution, the extrusion motor drives the input shaft of the reduction box to rotate, thereby driving the two extrusion screws to rotate rapidly.

[0011] Furthermore, the heat preservation oil pipe portion between every two adjacent expansion oil pipes is embraced in the heater;

[0012] Through the above technical solution, the oil flowing through the heat-retaining oil pipe is fully heated by the heater.

[0013] Furthermore, the connecting pipes connected to the output ends of the control solenoid valves are embraced in the heater;

[0014] Through the above technical solution, the oil is heated by the heater before entering the strip expansion bag to prevent the oil from cooling down and absorbing the heat of the material fluid after entering the strip expansion bag, thereby affecting the fluid forming effect.

[0015] Furthermore, a feed assembly is installed on the upper side wall of the reduction box, and the feed assembly includes a feed motor, a feed hopper, a feed box, a pressurizing chamber and a pressure control membrane. The output end of the feed motor is connected to a feed threaded rod and is arranged below the feed hopper and connected to the input end of the feed box through a feed pipe. The feed box is installed just above the gap between the two extrusion screws, the pressurizing chamber is arranged at the bottom of the feed hopper, and the pressure control membrane is arranged on the inner side of the pressurizing chamber.

[0016] Through the above technical solution, the fluid material entering the feed hopper is driven by the feed motor to be transported to the feed box, and then enters the two extrusion screws through the feed box for extrusion molding.

[0017] Furthermore, the left rear part of the heat preservation oil pipe is connected to a feed end pressure control assembly, and the feed end pressure control assembly includes a pressurized oil pipe and a feed end solenoid valve, one end of the pressurized oil pipe is connected to the left rear part of the heat preservation oil pipe, and the other end is connected to the input end of the feed end solenoid valve, and the feed end solenoid valve passes through the bottom of the feed hopper through a connecting pipe and is connected to the pressurized chamber;

[0018] Through the above technical solution, when it is necessary to improve the stability of the material entering the barrel, the solenoid valve at the feed end is opened, and the oil in the heat preservation oil pipe enters the pressurizing chamber through the pressurized oil pipe. As the volume of the oil entering the pressurizing chamber increases, the pressure control membrane begins to expand, and then squeezes the material discharged into the hopper, thereby improving the stability of the material.

[0019] The utility model has the following beneficial effects:

[0020] 1. In the utility model, when it is necessary to pressurize the material fluid stored in the two barrels, all the control solenoid valves are opened, and the oil stored in the expansion oil pipes enters the two strip expansion bags through the control solenoid valves. The strip expansion bags begin to expand, and then squeeze the internal space of the two barrels, effectively pressurizing the material fluid without affecting the extrusion speed of the fluid, and fully ensuring the molding effect of the material.

[0021] 2. In the utility model, the expansion of the front end part of the strip expansion bag can be controlled by opening the control solenoid valve at the front end alone, so that the fluid is pressurized before being extruded, thereby increasing the fluid extrusion amount, and the material discharged into the hopper is squeezed into the pressure control membrane, so that the stability of the material is improved.

[0022] 3. In the utility model, the oil flowing through the heat-retaining oil pipe is fully heated by a heater, and the heat-retaining oil pipe is embedded at both ends of the barrel. The heated oil can enhance the heating effect of the barrel and ensure the molding temperature of the fluid inside the barrel. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A three-dimensional diagram of an integrated twin-screw extruder for connection, unloading and pressurization proposed by the utility model;

[0024] Figure 2 This is an isometric view of an integrated twin-screw extruder for connection, unloading and pressurization proposed by the utility model;

[0025] Figure 3 This is a schematic diagram of an integrated twin-screw extruder for connection and unloading pressurization proposed by the utility model, with the heater and the extrusion head hidden;

[0026] Figure 4 This is a top view of an integrated twin-screw extruder for connection, unloading and pressurization proposed by the utility model;

[0027] Figure 5 for Figure 4 Isometric section view along AA.

[0028] Legend:

[0029] 1. Extruder base; 2. Extrusion motor; 3. Speed ​​reducer; 400. Loading and unloading transformer assembly; 500. Feeding assembly; 6. Extrusion screw; 7. Heater; 8. Extrusion head; 900. Feeding end pressure control assembly; 10. Barrel; 11. Strip expansion bag;

[0030] 401, control solenoid valve; 402, expansion oil pipe; 403, oil tank; 404, oil pump; 405, heat preservation oil pipe;

[0031] 501, feed motor; 502, feed hopper; 503, feed box; 504, pressurizing chamber; 505, pressure control membrane;

[0032] 901, solenoid valve at the feeding end; 902, pressurized oil pipe. DETAILED DESCRIPTION

[0033] 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.

[0034] Reference Figure 1-5 The utility model provides an embodiment: an integrated twin-screw extruder for loading and unloading and supercharging, comprising an extruder base 1, an extrusion motor 2, a reduction box 3, two extrusion screws 6, a plurality of heaters 7 and an extrusion head 8. The extrusion motor 2 is mounted on the upper side wall of the extruder base 1 at the rear side, the reduction box 3 is mounted on the upper side wall of the extruder base 1 and is located directly in front of the extrusion motor 2, the output shaft of the extrusion motor 2 is connected to the input shaft of the reduction box 3 through a coupling, the screw teeth of the two extrusion screws 6 are meshed with each other and are respectively connected to the two extrusion shafts of the reduction box 3, the front side wall of the reduction box 3 and the external bolts of the two extrusion screws 6 are connected to two barrels 10, the extrusion head 8 is bolted to the front side walls of the two barrels 10, and the plurality of heaters 7 are distributed in a linear array and embraced on the outer side walls of the two barrels 10, and the input shaft of the reduction box 3 is driven to rotate by the extrusion motor 2, thereby driving the two extrusion screws 6 to rotate rapidly.

[0035] A strip expansion bag 11 is fixedly connected to the middle position of one side wall of the two barrels 10 close to each other. A connecting and unloading transformer assembly 400 is installed at the right rear position of the upper side wall of the extruder base 1. The connecting and unloading transformer assembly 400 includes a plurality of control solenoid valves 401, a plurality of expansion oil pipes 402, an oil tank 403, an oil pump 404 and a heat preservation oil pipe 405. The oil pump 404 is installed on the top of the oil tank 403 and the input end of the oil pump 404 passes through the oil tank 403 through the oil pump pipe and passes to the bottom of the oil tank 403. The heat preservation oil pipe 405 is connected to the output end of the oil pump 404. The heat preservation oil pipe 405 is a disc-shaped structure. The middle part thereof is embedded in the contact surfaces on both sides of the two barrels 10, the other end of the heat preservation oil pipe 405 penetrates the left side wall of the oil tank 403 and reaches the bottom of the oil tank 403, a number of expansion oil pipes 402 are distributed in a linear array and penetrate the upper and lower ends of the leftmost part of the heat preservation oil pipe 405, a number of control solenoid valves 401 are arranged at the upper and lower ends of a number of heaters 7 and are distributed in a linear array, the other ends of the number of expansion oil pipes 402 are respectively connected to the input ends of the number of control solenoid valves 401, and the output ends of the number of control solenoid valves 401 penetrate the two barrels 10 through connecting pipes and reach the interior of the two strip expansion bags 11.

[0036] The input shaft of the reduction box 3 is driven to rotate by the extrusion motor 2, and then the two extrusion screws 6 are driven to rotate quickly. The middle part of the heat preservation oil pipe 405 is embedded in the two barrels 10. The heated oil can improve the heating effect of the barrel 10 to ensure the molding temperature of the fluid inside the barrel 10. When it is necessary to pressurize the material fluid stored in the two barrels 10, all the control solenoid valves 401 are opened, and the oil stored in the expansion oil pipes 402 enters the two strip expansion bags 11 through the control solenoid valves 401. The strip expansion bags 11 begin to expand, thereby squeezing As the strip-shaped expansion bag 11 expands, the inner volume of the two barrels 10 gradually decreases, which increases the pressure of the material fluid stored in the two barrels 10, thereby changing the material properties. This method squeezes the material fluid by expansion, effectively pressurizes the material fluid, and does not affect the extrusion speed of the fluid, thereby fully ensuring the molding effect of the material. By separately opening the front-end control solenoid valve 401, the front end part of the strip-shaped expansion bag 11 can be controlled to expand, so that the fluid is pressurized before being extruded, thereby increasing the fluid extrusion amount.

[0037] The heat preservation oil pipe 405 between every two adjacent expansion oil pipes 402 is partially embraced in the heater 7, so that the oil flowing through the heat preservation oil pipe 405 is fully heated by the heater 7, and the connecting pipes connected to the output ends of the control solenoid valves 401 are embraced in the heater 7. Before the oil enters the strip expansion bag 11, the oil is heated by the heater 7 to prevent the oil from cooling down and absorbing the heat of the material fluid after entering the strip expansion bag 11, thereby affecting the fluid forming effect.

[0038] The upper side wall of the reduction box 3 is provided with a feed assembly 500, which includes a feed motor 501, a feed hopper 502, a feed box 503, a pressurizing chamber 504 and a pressure control membrane 505. The output end of the feed motor 501 is connected to a feed threaded rod and is arranged below the feed hopper 502 and connected to the input end of the feed box 503 through a feed pipe. The feed box 503 is installed just above the gap between the two extrusion screws 6. The pressurizing chamber 504 is arranged at the bottom of the feed hopper 502. The pressure control membrane 505 is provided. The force control membrane 505 is arranged on the inner side of the pressurizing chamber 504, and the left rear part of the heat preservation oil pipe 405 is connected to the feed end pressure control component 900, and the feed end pressure control component 900 includes a pressurizing oil pipe 902 and a feed end solenoid valve 901. One end of the pressurizing oil pipe 902 is connected to the left rear part of the heat preservation oil pipe 405, and the other end is connected to the input end of the feed end solenoid valve 901. The feed end solenoid valve 901 passes through the bottom of the feed hopper 502 through a connecting pipe and is connected to the pressurizing chamber 504.

[0039] The fluid material entering the feed hopper 502 is driven by the feed motor 501 to be transported to the feed box 503, and enters the two extrusion screws 6 through the feed box 503 for extrusion molding. When it is necessary to improve the stability of the material entering the barrel 10, the feed end solenoid valve 901 is opened, and the oil in the heat preservation oil pipe 405 enters the pressurizing chamber 504 through the pressurizing oil pipe 902. As the volume of the oil entering the pressurizing chamber 504 increases, the pressure control membrane 505 begins to expand, and then squeezes the material discharged from the feed hopper 502, so that the stability of the material is improved.

[0040] Working principle: The feed motor 501 drives the fluid material entering into the feed hopper 502 to be transported to the feed box 503, and enters into the two extrusion screws 6 through the feed box 503 for extrusion molding. The extrusion motor 2 drives the input shaft of the reduction box 3 to rotate, thereby driving the two extrusion screws 6 to rotate rapidly. The middle part of the heat preservation oil pipe 405 is embedded in the two barrels 10. The heated oil can improve the heating effect of the barrel 10 to ensure the molding temperature of the fluid inside the barrel 10. When it is necessary to pressurize the material fluid stored in the two barrels 10, all the control solenoid valves 401 are opened, and the oil stored in the expansion oil pipes 402 enters into the two strip expansion bags 11 through the control solenoid valves 401. The strip expansion bags 11 begin to expand, thereby squeezing the internal space of the two barrels 10. As the strip expansion bags 11 expand, the two barrels The volume of the inner cavity of 10 gradually decreases, so that the pressure of the material fluid stored in the two barrels 10 increases, thereby changing the material properties. This method squeezes the material fluid by expansion, effectively pressurizes the material fluid, and will not affect the extrusion speed of the fluid, fully ensuring the molding effect of the material. By opening the frontmost control solenoid valve 401 separately, the front end part of the strip expansion bag 11 can be controlled to expand, so that the fluid is pressurized before being extruded, thereby increasing the fluid extrusion amount. When it is necessary to improve the stability of the material entering the barrel 10, the solenoid valve 901 at the feed end is opened, and the oil in the heat preservation oil pipe 405 enters the pressurized chamber 504 through the pressurized oil pipe 902. As the volume of the oil entering the pressurized chamber 504 increases, the pressure control membrane 505 begins to expand, thereby squeezing the material discharged into the hopper 502, so that the stability of the material is improved.

[0041] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. 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. An integrated twin-screw extruder for loading and unloading and pressurizing, comprising an extruder base (1), an extrusion motor (2), a reduction gearbox (3), two extrusion screws (6), a plurality of heaters (7) and an extrusion head (8), characterized in that: The threads of the two extrusion screws (6) are meshed with each other and are respectively connected to the two extrusion shafts of the reduction box (3); the front side wall of the reduction box (3) and the outside of the two extrusion screws (6) are bolted to two barrels (10); the extrusion head (8) is bolted to the front side walls of the two barrels (10); and a plurality of the heaters (7) are distributed in a linear array and are embraced on the outer side walls of the two barrels (10); A strip expansion bag (11) is fixedly connected to the middle position of one side wall of the two barrels (10) close to each other, and a connecting and unloading transformer assembly (400) is installed at the right rear position of the upper side wall of the extruder base (1). The connecting and unloading transformer assembly (400) includes a plurality of control solenoid valves (401), a plurality of expansion oil pipes (402), an oil tank (403), an oil pump (404) and a heat preservation oil pipe (405). The oil pump (404) is installed on the top of the oil tank (403) and the input end of the oil pump (404) passes through the oil tank (403) through the oil pump pipe and reaches the bottom of the oil tank (403). The heat preservation oil pipe (405) is connected to the output end of the oil pump (404). The heat preservation oil pipe (405) ) is a disc-shaped structure, the middle part of which is embedded in the contact surfaces on both sides of the two barrels (10), the other end of the heat preservation oil pipe (405) penetrates the left side wall of the oil tank (403) and reaches the bottom of the oil tank (403), a plurality of expansion oil pipes (402) are distributed in a linear array and penetrate the upper and lower ends of the leftmost part of the heat preservation oil pipe (405), a plurality of control solenoid valves (401) are arranged at the upper and lower ends of a plurality of heaters (7) and are distributed in a linear array, the other ends of the plurality of expansion oil pipes (402) are respectively connected to the input ends of a plurality of control solenoid valves (401), and the output ends of the plurality of control solenoid valves (401) penetrate the two barrels (10) through connecting pipes and reach the interior of the two strip expansion bags (11).

2. The integrated twin-screw extruder for connection and unloading and pressurization according to claim 1, characterized in that: The extrusion motor (2) is mounted on the upper side wall of the extruder base (1) at the rear side, the reduction box (3) is mounted on the upper side wall of the extruder base (1) and is located directly in front of the extrusion motor (2), and the output shaft of the extrusion motor (2) is connected to the input shaft of the reduction box (3) via a coupling.

3. The integrated twin-screw extruder for connection and unloading and pressurization according to claim 1, characterized in that: The heat preservation oil pipe (405) between every two adjacent expansion oil pipes (402) is partially embraced in the heater (7).

4. The integrated twin-screw extruder for connection and unloading and pressurization according to claim 2, characterized in that: The connecting pipes connected to the output ends of the control solenoid valves (401) are embraced in the heater (7).

5. The integrated twin-screw extruder for connection and unloading and pressurization according to claim 1, characterized in that: A feed assembly (500) is installed on the upper side wall of the reduction box (3), and the feed assembly (500) includes a feed motor (501), a feed hopper (502), a feed box (503), a pressurizing chamber (504) and a pressure control membrane (505). The output end of the feed motor (501) is connected to a feed threaded rod and is arranged below the feed hopper (502) and connected to the input end of the feed box (503) through a feed pipe. The feed box (503) is installed just above the gap between the two extrusion screws (6). The pressurizing chamber (504) is arranged at the bottom of the feed hopper (502), and the pressure control membrane (505) is arranged on the inner side of the pressurizing chamber (504).

6. The integrated twin-screw extruder for connection and unloading and pressurization according to claim 5, characterized in that: The left rear part of the heat preservation oil pipe (405) is connected to a feed end pressure control assembly (900), and the feed end pressure control assembly (900) includes a pressurized oil pipe (902) and a feed end solenoid valve (901). One end of the pressurized oil pipe (902) is connected to the left rear part of the heat preservation oil pipe (405), and the other end is connected to the input end of the feed end solenoid valve (901). The feed end solenoid valve (901) passes through the bottom of the feed hopper (502) through a connecting pipe and is connected to the pressurized chamber (504).

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