Feeding device of conical double-screw extruder
By using a combination of heat transfer oil and outlet heater in a conical twin-screw extruder, the problem of rapid temperature drop in plastics at low temperatures was solved, achieving stable heating and heat preservation of plastics, and improving the molding quality and appearance of the products.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-03-03
AI Technical Summary
When existing conical twin-screw extruders extrude plastics at low temperatures, the plastic temperature drops rapidly, resulting in poor molding quality and appearance.
A combination of container-injected heat transfer oil heating and outlet heater heating is used to provide sustained heating and insulation for the plastic, ensuring the stability of the plastic temperature during extrusion.
It improves the efficiency of plastic extrusion molding and enhances the production quality and appearance of products.
Smart Images
Figure CN223961680U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of extruder technology, and in particular to a feeding device for a conical twin-screw extruder. Background Technology
[0002] The conical twin-screw extruder is a high-efficiency, professional plastic processing equipment widely used in the plastics, rubber, chemical, and food industries. Its core feature lies in the two screws, which are typically arranged in a conical shape, with the distance between them gradually decreasing from the feed zone to the discharge zone. This design allows the screws to provide greater extrusion force, achieving compression and plasticization of the plastic through geometric changes. During operation, plastic is fed into the feeder, and the two screws rotate relative to each other, extruding the plastic from the extruder. However, the plastic is prone to sudden cooling upon extrusion, especially in low winter temperatures. This rapid drop in temperature can prevent proper molding, thus affecting the product's production quality and appearance. Utility Model Content
[0003] The purpose of this invention is to address the shortcomings of existing technologies by providing a feeding device for a conical twin-screw extruder. This device uses heat-conducting oil injected into a container for heating and a heater to provide sustained heating and insulation for the plastic, which is beneficial for efficient extrusion molding and improves the production quality and appearance of the product.
[0004] To achieve the above objectives, the present invention provides a feeding device for a conical twin-screw extruder, comprising a frame, a base movably disposed on the frame, and a feeding assembly disposed on the base. The feeding assembly includes a cavity, a container detachably disposed on the cavity, a first screw and a second screw rotatably disposed on the cavity, a discharge port disposed on the outside of the cavity and communicating with the first screw and the second screw, a gearbox drivingly connected to the first screw and the second screw, and a motor drivingly connected to the gearbox. The container is provided with mounting screws, and the container is connected to the cavity by the mounting screws so that the container is arranged around the circumference of the cavity. The discharge port is provided with a heater.
[0005] Preferably, a clamping component is provided between the discharge port and the heater. The clamping component includes a connecting arm, a first movable arm and a second movable arm movably connected to the connecting arm, a clamping rod rotatably connected between the first movable arm and the second movable arm, and a clamping groove provided in the first movable arm. The clamping rod is provided with a threaded section at one end near the clamping groove and a fastening nut threadedly connected to the threaded section. A washer is provided between the fastening nut and the clamping groove.
[0006] Preferably, a first hinge pin is provided between the first movable arm and the connecting arm, a second hinge pin is provided between the second movable arm and the connecting arm, a third hinge pin is provided between the second movable arm and the clamping rod, and a fixing screw is connected between the connecting arm and the discharge port. The connecting arm, the first movable arm, the second movable arm, and the clamping rod are connected end to end and prevent contact with the outer periphery of the heater.
[0007] Preferably, the frame is provided with a drive assembly, which includes a lead screw, a lead screw nut screwed onto the outside of the lead screw, a connecting seat connected to the lead screw nut, and a handwheel disposed on the lead screw. The connecting seat is connected to the frame.
[0008] Preferably, guide rails are provided on both sides of the frame, and the base is provided with a slider that is slidably connected to the guide rails.
[0009] Preferably, a hopper is provided at the top of the cavity, and the hopper is connected to the cavity.
[0010] The beneficial effects of this invention are: by injecting heat-conducting oil into the container and activating the heater, the plastic is heated and kept warm for a long time, which is conducive to efficient extrusion molding and improves the production quality and appearance of the product. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of this utility model.
[0012] Figure 2 This is a schematic diagram of the structure of this utility model from another angle.
[0013] Figure 3 This is an exploded view of the clamping component of this utility model.
[0014] The reference numerals in the figures include:
[0015] 1 - Frame 11 - Guide Rail
[0016] 2—Seat 21—Slider
[0017] 3—Feeding assembly; 31—Cavity; 32—Container
[0018] 33 – First screw; 34 – Second screw; 35 – Discharge port
[0019] 36 — Gearbox 37 — Motor 38 — Mounting screws
[0020] 39 - Hopper
[0021] 4 - Heater
[0022] 5—Clamping component; 51—Connecting arm; 52—First movable arm
[0023] 53 - Second movable arm; 54 - Clamping rod; 55 - Clamping groove
[0024] 56 – Threaded section; 57 – Fastening nut; 58 – Washer.
[0025] 59 – First hinge pin; 510 – Second hinge pin; 511 – Third hinge pin
[0026] 512 - Fixing screw
[0027] 6—Drive assembly; 61—Lead screw assembly; 62—Lead screw nut
[0028] 63 - Connecting seat; 64 - Handwheel. Detailed Implementation
[0029] The present invention will now be described in detail with reference to the accompanying drawings.
[0030] like Figures 1 to 3 As shown, a feeding device for a conical twin-screw extruder according to this utility model includes a frame 1, a base 2 movably disposed on the frame 1, and a feeding assembly 3 disposed on the base 2. The feeding assembly 3 includes a cavity 31, a container 32 detachably disposed on the cavity 31, a first screw 33 and a second screw 34 rotatably disposed on the cavity 31, a discharge port 35 disposed on the outside of the cavity 31 and communicating with the first screw 33 and the second screw 34, a gearbox 36 drivingly connected to the first screw 33 and the second screw 34, and a motor 37 drivingly connected to the gearbox 36. The container 32 is provided with mounting screws 38, and the container 32 is connected to the cavity 31 by mounting screws 38 so that the container 32 is arranged around the circumference of the cavity 31. The discharge port 35 is provided with a heater 4.
[0031] During operation, unscrew the mounting screw 38 to remove the container 32 from the cavity 31, inject heat-conducting oil into the container 32 (mineral-based or synthetic heat-conducting oil can be used in the prior art), and then tighten the mounting screw 38 to connect and fix the container 32 to the outside of the cavity 31. The heat-conducting oil circulates through the closed space of the container 32 to transfer heat and keep the cavity 31 warm. Place the plastic into the cavity 31 and start the motor 37. The motor 37 drives the first screw 33 and the second screw 34 to rotate through the gearbox 36. The first screw 33 and the second screw 34 are arranged in a conical shape and rotate relative to each other within the cavity 31. The plastic is extruded from the cavity 31 to the outlet 35, where a heater 4 is installed. The heater 4 contains a heating element. Existing heating elements are tubular electric heating elements that convert electrical energy into heat energy. These elements typically consist of a metal tube as the outer shell, filled with magnesium oxide powder or other insulating materials, and contain a spiral or straight heating wire. When current passes through the heating wire, resistance generates heat, which is transferred through the magnesium oxide powder to the surface of the metal tube, and then conducted through the metal tube to the heater 4. This ensures that the temperature of the extruded plastic remains stable and does not fluctuate significantly, enabling efficient extrusion molding. This invention, through the injection of heat-conducting oil into the container 32 and the activation of the heater 4, provides a sustained heating and heat preservation effect on the plastic, facilitating efficient extrusion molding and improving product quality and appearance.
[0032] In this embodiment, a clamping component 5 is provided between the discharge port 35 and the heater 4. The clamping component 5 includes a connecting arm 51, a first movable arm 52 and a second movable arm 53 movably connected to the connecting arm 51, a clamping rod 54 rotatably connected between the first movable arm 52 and the second movable arm 53, and a clamping groove 55 provided in the first movable arm 52. The clamping rod 54 is provided with a threaded section 56 at one end near the clamping groove 55 and a fastening nut 57 threadedly connected to the threaded section 56. A washer 58 is provided between the fastening nut 57 and the clamping groove 55. Specifically, the first movable arm 52 and the second movable arm 53 swing up and down relative to the connecting arm 51, and the clamping rod 54 swings left and right relative to the first movable arm 52 and the second movable arm 53, so that the connecting arm 51, the first movable arm 52, the second movable arm 53, and the clamping rod 54 clamp and fix around the heater 4. Finally, the clamping rod 54 is inserted into the clamping groove 55, and the fastening nut 57 is threadedly connected to the threaded section 56. A washer 58 is provided between the fastening nut 57 and the clamping groove 55. The washer 58 plays a role in protecting the surface, dispersing pressure, preventing loosening, and sealing, thereby realizing the clamping and fixing of the heater 4 by the clamping part 5, which is flexible and convenient to use.
[0033] In this embodiment, a first hinge pin 59 is provided between the first movable arm 52 and the connecting arm 51, a second hinge pin 510 is provided between the second movable arm 53 and the connecting arm 51, and a third hinge pin 511 is provided between the second movable arm 53 and the clamping rod 54. A fixing screw 512 connects the connecting arm 51 and the discharge port 35. The connecting arm 51, the first movable arm 52, the second movable arm 53, and the clamping rod 54 are connected end to end and prevent contact with the outer periphery of the heater 4. Specifically, the fixing screw 512 passes through the connecting arm 51 and is fixed to the outer wall of the discharge port 35, effectively installing and fixing the connecting arm 51 to the discharge port 35. The first movable arm 52 is movably hinged to the connecting arm 51 through the first hinge pin 59, the second movable arm 53 is movably hinged to the connecting arm 51 through the second hinge pin 510, and the clamping rod 54 is movably hinged to the second movable arm 53 through the third hinge pin 511. The structure is simple and compact, and has high flexibility of use.
[0034] In this embodiment, the frame 1 is equipped with a drive assembly 6, which includes a lead screw 61, a lead screw nut 62 screwed onto the outside of the lead screw 61, a connecting seat 63 connected to the lead screw nut 62, and a handwheel 64 disposed on the lead screw 61. The connecting seat 63 is connected to the seat 2. Specifically, before starting work, the operator rotates the handwheel 64, which drives the lead screw 61 to rotate, further driving the lead screw nut 62 to move along the length of the lead screw 61. Since the connecting seat 63 is connected to the lead screw nut 62, the drive assembly 6 drives the seat 2 to move through the connecting seat 63, adjusting the seat 2 to a suitable working position, which is simple and efficient.
[0035] In this embodiment, guide rails 11 are provided on both sides of the frame 1, and the seat 2 is provided with a slider 21 that is slidably connected to the guide rails 11. Specifically, the seat 2 is slidably connected to the guide rails 11 through the slider 21, which effectively supports and guides the seat 2 to reciprocate in a given direction, reduces friction, makes the movement smoother, and reduces impact and vibration.
[0036] In this embodiment, a hopper 39 is provided at the top of the cavity 31, and the hopper 39 is connected to the cavity 31. Specifically, plastic falls along the hopper 39 into the cavity 31, so that the first screw 33 and the second screw 34 can compress and plasticize the plastic.
[0037] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of this utility model. The content of this specification should not be construed as a limitation of this utility model.
Claims
1. A feeding device for a conical twin-screw extruder, characterized in that: The device includes a frame, a base movably mounted on the frame, and a feeding assembly mounted on the base. The feeding assembly includes a cavity, a container detachably mounted on the cavity, a first screw and a second screw rotatably mounted on the cavity, a discharge port located outside the cavity and communicating with the first screw and the second screw, a gearbox drivingly connected to the first screw and the second screw, and a motor drivingly connected to the gearbox. The container is provided with mounting screws and is connected to the cavity by the mounting screws so that the container is arranged around the circumference of the cavity. The discharge port is provided with a heater.
2. The feeding device for a conical twin-screw extruder according to claim 1, characterized in that: A clamping component is provided between the discharge port and the heater. The clamping component includes a connecting arm, a first movable arm and a second movable arm movably connected to the connecting arm, a clamping rod rotatably connected between the first movable arm and the second movable arm, and a clamping groove provided in the first movable arm. A threaded section is provided at one end of the clamping rod near the clamping groove, and a fastening nut is threadedly connected to the threaded section. A washer is provided between the fastening nut and the clamping groove.
3. The feeding device for a conical twin-screw extruder according to claim 2, characterized in that: A first hinge pin is provided between the first movable arm and the connecting arm, a second hinge pin is provided between the second movable arm and the connecting arm, a third hinge pin is provided between the second movable arm and the clamping rod, and a fixing screw is connected between the connecting arm and the discharge port. The connecting arm, the first movable arm, the second movable arm, and the clamping rod are connected end to end and block contact with the outer periphery of the heater.
4. The feeding device for a conical twin-screw extruder according to claim 1, characterized in that: The frame is equipped with a drive assembly, which includes a lead screw, a lead screw nut screwed onto the outside of the lead screw, a connecting seat connected to the lead screw nut, and a handwheel disposed on the lead screw. The connecting seat is connected to the base.
5. The feeding device for a conical twin-screw extruder according to claim 1, characterized in that: Guide rails are provided on both sides of the frame, and a slider is provided on the base to slide in connection with the guide rails.
6. The feeding device for a conical twin-screw extruder according to claim 1, characterized in that: A hopper is provided at the top of the cavity, and the hopper is connected to the cavity.