Double-screw extruder for modified plastics

Abstract

The utility model relates to the technical field of modified plastic processing, in particular to a double-screw extruder for modified plastics, which comprises a driving mechanism, an extruding mechanism and a suction mechanism, the extruding mechanism is positioned at the front end of the driving mechanism, the suction mechanism is positioned on the front side of the top end of the extruding mechanism, the driving mechanism comprises a driver, and the driver is connected with the extruding mechanism. A cushion block is fixedly installed at the bottom end of the driver, a transmission gear box is fixedly installed at the front end of the driver, a connecting plate is fixedly installed at the bottom end of the transmission gear box, a connecting block is fixedly installed at the front end of the transmission gear box, and a transmission shaft is movably installed in the middle of the connecting block. White smoke generated by extruding materials is sucked and discharged through suction of the suction device, so that the body of a worker is prevented from being affected by toxic substances in the white smoke, the temperature of gas is lowered due to the fact that airflow is generated during suction, the materials can be preliminarily cooled due to the influence of the low-temperature airflow when being discharged, and the material is cooled. And the subsequent cooling and shaping work difficulty is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of modified plastic processing, and specifically relates to a twin-screw extruder for modified plastics. Background Art

[0002] The twin-screw extruder is an important industrial production equipment, which is widely used in the fields of medicine, food, chemical industry, etc. It has the characteristics of high efficiency, energy conservation and environmental protection, diversification, high degree of automation, etc., and a twin-screw extruder is required during the production of modified plastics.

[0003] As disclosed in the authorized publication number CN207564923U, a twin-screw extruder for thin-wall high-rigidity modified PP plastics is disclosed, including: a screw barrel and two mutually meshing screws arranged in the screw barrel; the screws are divided into a material conveying and melting section, a first mixing section, an exhaust section, a second mixing section, a vacuum exhaust section and a compaction and conveying section corresponding to the screw barrel. The PP plastics produced by the utility model have both high flexural modulus and high impact strength at the same time, improve its quality stability and have good performance indexes. Since only the types and arrangements of the threaded parts are changed, the transformation cost is low.

[0004] However, in the existing twin-screw extruder, a small amount of toxic substances will be contained in the white smoke generated during the extrusion of materials, but it will cause damage to the personnel in the workshop after long-term emission. Summary of the Utility Model

[0005] The purpose of the utility model is to provide a twin-screw extruder for modified plastics to solve the problems raised in the above background art.

[0006] To achieve the above purpose, the utility model provides the following technical solutions:

[0007] A twin-screw extruder for modified plastics includes a driving mechanism, an extrusion mechanism and a suction mechanism. The extrusion mechanism is located at the front end of the driving mechanism, and the suction mechanism is located at the front side of the top of the extrusion mechanism. The driving mechanism includes a driver, a cushion block is fixedly installed at the bottom end of the driver, a transmission gear box is fixedly installed at the front end of the driver, a connecting plate is fixedly installed at the bottom end of the transmission gear box, a connecting block is fixedly installed at the front end of the transmission gear box, and a transmission shaft is movably installed in the middle of the connecting block.

[0008] Preferably, the extrusion mechanism includes an extrusion box, a connecting block is fixedly installed at the rear end of the extrusion box, and a supporting leg is fixedly installed at the bottom end of the extrusion box.

[0009] Preferably, a feeding cylinder is fixedly installed at the rear side of the top of the extrusion box, a heater is fixedly installed at the top of the extrusion box, and a ventilation fan is fixedly installed at the top of the heater.

[0010] Preferably, a movable plate is movably installed at the front end of the extrusion box. A hinge is fixedly installed at the connection between the movable plate and the extrusion box, and a discharge head is fixedly installed at the front end of the movable plate.

[0011] Preferably, an extrusion channel is formed in the middle of the extrusion box, and a screw rod is movably installed in the extrusion channel. Heating blocks are fixedly installed on both the upper and lower sides in the middle of the extrusion box.

[0012] Preferably, the suction mechanism includes a suction device. The suction device is fixedly installed on the front side of the top end of the extrusion box, and a heat dissipation window is provided at the right end of the suction device.

[0013] Preferably, an exhaust pipe is fixedly installed at the left end of the suction device, a suction pipe is fixedly installed at the front end of the suction device, and a suction hood is fixedly installed at the bottom end of the suction pipe.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] For this twin-screw extruder for modified plastics, when the suction device starts to work for suction, the white smoke generated during the extrusion of the material is sucked into the suction device and discharged through the exhaust pipe. The exhaust pipe can be connected to a filtering device to prevent the toxic substances in the white smoke from being emitted and affecting the health of the staff.

[0016] For this twin-screw extruder for modified plastics, during suction, the gas around the discharge head is drawn to generate an air flow. The increase in the air flow speed causes the gas temperature to decrease. Therefore, when the material is discharged, it can be preliminarily cooled under the influence of the low-temperature air flow, reducing the difficulty of subsequent cooling and shaping work. Description of the Drawings

[0017] Figure 1 is the overall structural schematic diagram of the present utility model;

[0018] Figure 2 is the structural schematic diagram of the suction mechanism of the present utility model;

[0019] Figure 3 is the structural schematic diagram of the driving mechanism of the present utility model;

[0020] Figure 4 is the internal plane schematic diagram of the extrusion box of the present utility model.

[0021] In the figure: 101, driving mechanism; 102, extrusion mechanism; 103, suction mechanism; 104, driver; 105, cushion block; 106, transmission gearbox; 201, connecting plate; 202, connecting block; 203, transmission shaft; 204, extrusion box; 206, support leg; 301, injection barrel; 302, heater; 303, ventilation fan; 304, movable plate; 305, hinge; 306, discharge head; 401, extrusion channel; 402, screw rod; 403, heating block; 404, suction device; 405, suction pipe; 406, suction hood; 501, heat dissipation window; 502, exhaust pipe. Detailed implementation mode

[0022] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0023] Please refer to Figures 1 - 4 As shown, a technical solution provided by the present invention:

[0024] A twin-screw extruder for modified plastics includes a driving mechanism 101, an extrusion mechanism 102 and a suction mechanism 103. The extrusion mechanism 102 is located at the front end of the driving mechanism 101, and the suction mechanism 103 is located at the front side of the top of the extrusion mechanism 102. The driving mechanism 101 includes a driver 104. A cushion block 105 is fixedly installed at the bottom end of the driver 104, a transmission gearbox 106 is fixedly installed at the front end of the driver 104, a connecting plate 201 is fixedly installed at the bottom end of the transmission gearbox 106, a connecting block 202 is fixedly installed at the front end of the transmission gearbox 106, and a transmission shaft 203 is movably installed in the middle of the connecting block 202.

[0025] Through the above solution, the driver can be supported by the cushion block. By the operation of the driver, the transmission gearbox can be started to operate and drive, so that the transmission shaft is driven to rotate in the opposite direction. The transmission gearbox and the extrusion box can be connected through the connecting block.

[0026] In this embodiment, preferably, the extrusion mechanism 102 includes an extrusion box 204. A connecting block 202 is fixedly installed at the rear end of the extrusion box 204, and a support leg 206 is fixedly installed at the bottom end of the extrusion box 204.

[0027] Through the above solution, the extrusion box can be supported by the support leg, and the material can be extruded through the extrusion box.

[0028] In this embodiment, preferably, a feeding cylinder 301 is fixedly installed at the rear side of the top end of the extrusion box 204, a heater 302 is fixedly installed at the top end of the extrusion box 204, and a ventilation fan 303 is fixedly installed at the top end of the heater 302.

[0029] Through the above solution, the granular material can be conveyed into the extrusion channel through the feeding cylinder, the material can be heated through the heater, and the heater can be ventilated and dissipated through the ventilation window.

[0030] In this embodiment, preferably, a movable plate 304 is movably installed at the front end of the extrusion box 204, a hinge 305 is fixedly installed at the connection between the movable plate 304 and the extrusion box 204, and a discharge head 306 is fixedly installed at the front end of the movable plate 304.

[0031] Through the above solution, the movable plate can be opened and closed through the hinge, so that the screw rod can be conveniently taken out for cleaning after the extrusion work is completed, and the material can be extruded according to the shape through the discharge head.

[0032] In this embodiment, preferably, an extrusion channel 401 is formed in the middle of the extrusion box 204, a screw rod 402 is movably installed in the extrusion channel 401, and heating blocks 403 are fixedly installed on the upper and lower sides of the middle of the extrusion box 204.

[0033] Through the above solution, the material can be conveyed through the extrusion channel, the material can be extruded and conveyed through the screw rod, and the extrusion channel can be heated by the heating block to melt the material.

[0034] In this embodiment, preferably, the suction mechanism 103 includes a suction device 404, the suction device 404 is fixedly installed at the front side of the top end of the extrusion box 204, and a heat dissipation window 501 is opened at the right end of the suction device 404.

[0035] Through the above solution, gas can be sucked through the suction device, and the suction device can be dissipated through the heat dissipation window.

[0036] In this embodiment, preferably, an exhaust pipe 502 is fixedly installed at the left end of the suction device 404, a suction pipe 405 is fixedly installed at the front end of the suction device 404, and a suction hood 406 is fixedly installed at the bottom end of the suction pipe 405.

[0037] Through the above solution, the white smoke generated during extrusion can be sucked through the suction pipe and the suction hood, and the white smoke can be discharged through the exhaust pipe.

[0038] When a twin-screw extruder for modified plastics in this embodiment is in use, the user connects it with a material conveying device through a feeding cylinder 301. At this time, the driver 104 works to drive the transmission gearbox 106 to operate, causing the transmission shaft 203 to start rotating in opposite directions. The opposite rotation of the transmission shaft 203 makes the screw rod 402 rotate in opposite directions in the extrusion channel 401. At this time, the feeding cylinder 301 starts to feed materials into the extrusion channel 401. The materials are conveyed by the rotation of the screw rod 402 and are evenly mixed in the extrusion channel 401. At the same time, the heater 302 works to heat the heating blocks 403 on the upper and lower sides of the extrusion channel 401. The heating causes the materials to start melting. The melted materials continue to be mixed during conveyance. When the materials are conveyed to the front end of the extrusion channel 401, due to the continuous conveyance of the materials, the materials are extruded and discharged from the discharge head 306. When the materials are discharged, they contact the low-temperature air and produce white smoke. At this time, the suction device 404 works and starts to suck through the suction pipe 405 and the suction hood 406 at the top of the discharge head 306, so that the generated white smoke is sucked into the suction device 404 and discharged through the exhaust pipe 502. The exhaust pipe 502 can be connected to a filtering device to prevent the toxic substances in the white smoke from being emitted and affecting the health of the staff. At the same time, when sucking, the gas around the discharge head 306 is drawn to generate an air flow. The increase in the air flow speed causes the gas temperature to decrease. Therefore, when the materials are discharged, they can be preliminarily cooled under the influence of the low-temperature air flow, reducing the difficulty of subsequent cooling and shaping work.

[0039] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only preferred examples of the present invention and are not used to limit the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A twin-screw extruder for modified plastics, characterized in that: The invention comprises a driving mechanism (101), an extrusion mechanism (102) and a suction mechanism (103), wherein the extrusion mechanism (102) is located at the front end of the driving mechanism (101), and the suction mechanism (103) is located at the front side of the top end of the extrusion mechanism (102); the driving mechanism (101) comprises a driver (104), a cushion block (105) is fixedly mounted at the bottom end of the driver (104), a transmission gear box (106) is fixedly mounted at the front end of the driver (104), a connecting plate (201) is fixedly mounted at the bottom end of the transmission gear box (106), a connecting block (202) is fixedly mounted at the front end of the transmission gear box (106), and a transmission shaft (203) is movably mounted in the middle of the connecting block (202).

2. A twin-screw extruder for modified plastics according to claim 1, characterized in that: The extrusion mechanism (102) comprises an extrusion box (204), a connection block (202) is fixedly mounted on the rear end of the extrusion box (204), and a support foot (206) is fixedly mounted on the bottom end of the extrusion box (204).

3. A twin-screw extruder for modified plastics according to claim 2, characterized in that: A material injection cylinder (301) is fixedly mounted on the rear side of the top end of the extrusion box (204), a heater (302) is fixedly mounted on the top end of the extrusion box (204), and a ventilation fan (303) is fixedly mounted on the top end of the heater (302).

4. A twin-screw extruder for modified plastics according to claim 3, characterized in that: A movable plate (304) is movably mounted at the front end of the extrusion box (204), a hinge (305) is fixedly mounted at the connection between the movable plate (304) and the extrusion box (204), and a discharge head (306) is fixedly mounted at the front end of the movable plate (304).

5. A twin-screw extruder for modified plastics according to claim 4, characterized in that: An extrusion channel (401) is provided in the middle of the extrusion box (204), a screw rod (402) is movably installed in the extrusion channel (401), and heating blocks (403) are fixedly installed on the upper and lower sides of the middle of the extrusion box (204).

6. A twin-screw extruder for modified plastics according to claim 1, characterized in that: The suction mechanism (103) comprises a suction device (404), which is fixedly mounted on the front side of the top end of the extrusion box (204), and a heat dissipation window (501) is provided at the right end of the suction device (404).

7. A twin-screw extruder for modified plastics according to claim 6, characterized in that: An exhaust pipe (502) is fixedly installed at the left end of the aspirator (404), a suction pipe (405) is fixedly installed at the front end of the aspirator (404), and a suction hood (406) is fixedly installed at the bottom end of the suction pipe (405).

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