Technical Field
The utility model relates to an extrusion device for corrugated plastic sheets using powder raw materials, belonging to the field of plastic machinery. It is mainly used to extrude plastic sheets from powder raw materials in the production process of corrugated plastic sheets.
Background Art
At present, granular raw materials are adopted for sheet extrusion during the production of corrugated plastic sheets. Consequently, an additional granulation procedure is required if powder raw materials are used.In view of the current situation of machinery for manufacturing corrugated plastic sheets, there is an urgent demand for an extrusion device capable of directly producing corrugated plastic sheets from powder raw materials without granulation while achieving high production efficiency.
Contents of the Utility Model
The purpose of the utility model is to provide an extrusion device for corrugated plastic sheets using powder raw materials, which overcomes the drawbacks of existing corrugated plastic sheet manufacturing equipment. The device can directly extrude sheets from powder raw materials without prior granulation and delivers high production efficiency.
The technical solution is described as follows. The device comprises a main extruder, an auxiliary extruder, a screen-changer metering unit, an extrusion die assembly and a cooling water supply unit.
The main extruder includes a main frame, main drive, co-rotating twin-screw extruder, feeding hopper and cooling pipe network. The main frame adopts a rectangular frame structure with one frame plane placed on the ground. The main drive is mounted at one end of the upward-facing frame plane, and the co-rotating twin-screw extruder is installed at the other end. The input end of the co-rotating twin-screw extruder adjacent to the main drive is connected to the output shaft of the main drive, and a feeding hopper is arranged above the input end of the twin-screw extruder. A cooling pipe network is mounted on one side of the co-rotating twin-screw extruder. The water supply pipe of the cooling pipe network is connected to the water inlet of the cooling water jacket of the twin-screw extruder, and the return water pipe of the cooling pipe network is connected to the water outlet of the cooling water jacket.
The auxiliary extruder includes an auxiliary base frame, auxiliary support frame, auxiliary support legs, auxiliary drive, single-screw extruder and feeding hopper. The auxiliary base frame is a planar rectangular frame with one plane placed on the ground, and its length direction is parallel to that of the main frame of the main extruder. An auxiliary support frame of rectangular frame structure is fixed above one end of the auxiliary base frame, and auxiliary support legs are fixed at the other end. The auxiliary drive is installed on the auxiliary support frame. The input end of the single-screw extruder close to the auxiliary drive is connected to the output shaft of the auxiliary drive, and the other end of the single-screw extruder is supported on the auxiliary support legs. A feeding hopper is arranged above the input end of the single-screw extruder.
The screen-changer metering unit includes a metering frame, metering pump, metering drive and screen changer. The rectangular metering frame is supported on the ground via supports and located at the tail end of the co-rotating twin-screw extruder away from the main drive. A metering pump is installed on the upper frame plane of the metering frame. The axis of the input shaft of the metering pump is perpendicular to the axis of the twin-screw extruder, and the input shaft of the metering pump is connected to the output shaft of the metering drive mounted on the metering frame. The screen changer is installed between the tail end of the co-rotating twin-screw extruder away from the main drive and the metering pump. The inlet and outlet of the screen changer are connected to the outlet of the twin-screw extruder and the inlet of the metering pump respectively.
The extrusion die assembly includes a die frame, extrusion die, combining valve, main machine interface and auxiliary machine interface. The rectangular die frame is arranged on the ground via casters and located on the side of the screen-changer metering unit away from the main extruder. The extrusion die is mounted on the upper frame plane of the die frame, and the extrusion outlet of the die faces away from the screen-changer metering unit. A combining valve is installed at the middle part of the die surface facing the screen-changer metering unit. The main machine interface is arranged at the middle part of the combining valve on the side away from the extrusion die and connected to the outlet of the metering pump of the screen-changer metering unit. The auxiliary machine interface is arranged on the side of the combining valve and connected to the outlet of the single-screw extruder of the auxiliary extruder at the end away from the auxiliary drive.
The cooling water supply unit includes a water tank frame, water tank and water pump. The rectangular water tank frame is placed on the ground via casters. A water tank and a water pump are arranged above the frame. The water outlet of the water pump is connected to the water supply pipe of the cooling pipe network of the main extruder, the return water pipe of the cooling pipe network is connected to the water tank, and the water inlet of the water pump is connected to the water tank.
On the basis of the prior art, the main frame of the main extruder adopts a rectangular frame structure with one frame plane placed on the ground. The main drive is mounted at one end of the upward frame plane, and the co-rotating twin-screw extruder is arranged at the other end. The input end of the twin-screw extruder adjacent to the main drive is connected to the output shaft of the main drive, and a feeding hopper is arranged above the input end. A cooling pipe network is mounted on one side of the twin-screw extruder; the water supply pipe is connected to the inlet of the extruder cooling jacket, and the return pipe is connected to the outlet of the cooling jacket.
The auxiliary base frame of the auxiliary extruder is a planar rectangular frame resting on the ground, with its length direction parallel to the main frame of the main extruder. An auxiliary rectangular support frame is fixed above one end of the base frame, and auxiliary support legs are fixed at the other end. The auxiliary drive is mounted on the support frame. The input end of the single-screw extruder is connected to the auxiliary drive output shaft, and the opposite end of the extruder is supported by the auxiliary legs. A feeding hopper is fitted above the extruder input end.
The rectangular metering frame of the screen-changer metering unit is supported on the ground and positioned at the discharge end of the co-rotating twin-screw extruder. A metering pump is installed on the upper frame plane, the input shaft of which is perpendicular to the twin-screw extruder axis and driven by the metering drive. The screen changer is arranged between the twin-screw extruder outlet and the metering pump, with its inlet and outlet connected correspondingly.
The rectangular die frame of the extrusion die assembly is equipped with casters and arranged on the side away from the main extruder. The extrusion die is installed on the upper frame plane with its extrusion outlet facing outward. A combining valve is mounted on the side of the die facing the metering unit. The main machine interface on the combining valve is connected to the metering pump outlet, while the auxiliary machine interface on the valve side is connected to the outlet of the auxiliary single-screw extruder.
The rectangular water tank frame of the cooling water supply unit is fitted with casters. A water tank and water pump are arranged on the frame. The pump outlet connects to the cooling pipe network supply line, the cooling network return line connects back to the water tank, and the pump inlet communicates with the water tank.
Working Principle
Fill the feeding hopper of the main extruder with powder raw materials, and fill the feeding hopper of the auxiliary extruder with granular raw materials. Activate the heating systems of the main extruder and auxiliary extruder for preheating. When the temperature reaches the set value, start the co-rotating twin-screw extruder of the main extruder, the single-screw extruder of the auxiliary extruder, and the water pump of the cooling water supply unit.
Plastic mud in plasticized state extruded by the co-rotating twin-screw extruder of the main extruder undergoes temperature control via the cooling pipe network and cooling water supply unit. After precise metering through the screen changer and metering pump of the screen-changer metering unit, it is injected into the combining valve of the extrusion die assembly together with plasticized plastic mud extruded by the single-screw extruder of the auxiliary extruder. After being combined inside the combining valve, the plastic mud from the auxiliary single-screw extruder wraps around the plastic mud extruded by the main co-rotating twin-screw extruder. The composite material then passes through the extrusion die to form corrugated plastic sheets with multiple hollow cross-sections.
When impurities filtered and accumulated on the filter screen of the screen changer reach the set threshold, the screen changer automatically switches to a clean filter screen.
Compared with existing equipment in the industry, the utility model has the following advantages:The powder raw materials are heated and dehumidified, added with additives for surface activation treatment, mixed evenly with appropriate filling powder and other modified formulation additives, and then fed into the hopper and extruded by the co-rotating twin-screw extruder toward the combining valve of the extrusion die assembly. Therefore, corrugated plastic sheets can be directly extruded from powder raw materials, eliminating the granulation process.Equipped with a matched auxiliary extruder, plastic mud extruded by the single-screw extruder can form an outer wrapping layer, which improves the utilization rate of high-quality plastic raw materials.
