A high-efficiency plastic screw extruder

Abstract

The utility model discloses a kind of high-efficiency screw plastic extruders, including outer cylinder, inner cylinder is rotatably installed in outer cylinder, and the gap between the outer wall of inner cylinder and the inner wall of outer cylinder forms extrusion flow passage;Spiral blade is equipped on the lower end of the outer wall of inner cylinder, and the outer end of spiral blade is in abutment on the inner wall of outer cylinder;The central axis position of inner cylinder is coaxially equipped with feed pipe, and heating rod is equipped on the inner wall of inner cylinder, and inner cylinder is rotatably arranged relative to feed pipe;Discharge port is equipped on the sidewall of the upper end of inner cylinder, and the lower end of inner cylinder is blocked and set;It further includes extrusion mechanism, and extrusion flow passage in the bottom of outer cylinder is communicated with extrusion mechanism by discharging pipe.The utility model can heat plastic slurry conveniently, reduce heat loss, enhance the fluidity of plastic slurry, and can realize quantitative extrusion simultaneously.

Description

Technical Field

[0001] The utility model relates to an efficient screw plastic extruder, belonging to the technical field of screw plastic extruders. Background Art

[0002] In plastic extrusion molding equipment, the plastic extruder is usually called the main machine, while the subsequent plastic extrusion molding machine supporting it is called the auxiliary machine. After more than 100 years of development, the plastic extruder has evolved from the original single screw to various models such as double screw, multi-screw, and even non-screw. The plastic extruder (main machine) can be matched with various plastic molding auxiliary machines such as pipes, films, rods, monofilaments, flat filaments, packing straps, wire meshes, plates (sheets), profiles, granulation, and cable coating to form various plastic extrusion molding production lines and produce various plastic products. The screw plastic extruder is a commonly used plastic extrusion device. A spiral blade is arranged on the rotating rod, and when the spiral blade rotates with the rotating rod, the plastic is extruded.

[0003] The existing screw plastic extruders have the following drawbacks in use: First, it is not convenient to heat the plastic slurry, and the heat dissipation is fast, resulting in poor fluidity of the plastic slurry and inconvenience in extrusion;

[0004] Second, during extrusion, it is not convenient to control the extrusion amount, and quantitative extrusion cannot be achieved.

[0005] In summary, the existing technology is obviously inconvenient and defective in actual use, so it is necessary to improve it. Content of the Utility Model

[0006] Aiming at the deficiencies in the background art, the utility model provides an efficient screw plastic extruder, which can facilitate the heating of the plastic slurry, reduce heat dissipation, enhance the fluidity of the plastic slurry, and at the same time achieve quantitative extrusion.

[0007] To solve the above technical problems, the utility model adopts the following technical solutions:

[0008] An efficient screw plastic extruder includes an outer cylinder. An inner cylinder is rotatably installed inside the outer cylinder, and a gap between the outer wall of the inner cylinder and the inner wall of the outer cylinder forms an extrusion channel;

[0009] A spiral blade is provided at the lower end of the outer wall of the inner cylinder, and the outer end of the spiral blade abuts against the inner wall of the outer cylinder; a feed pipe is coaxially provided at the central axis position of the inner cylinder, a heating rod is provided on the inner wall of the inner cylinder, and the inner cylinder is rotatably arranged relative to the feed pipe;

[0010] A discharge port is provided on the side wall at the upper end of the inner cylinder, and the lower end of the inner cylinder is sealed;

[0011] It further includes an extrusion mechanism. The extrusion channel at the bottom of the outer cylinder is connected to the extrusion mechanism through a discharge pipe.

[0012] Furthermore, a one-way valve is installed on the discharge pipe, which ensures that the liquid material can only flow from the extrusion channel to the extrusion mechanism and cannot flow back.

[0013] Furthermore, the lower ends of both the outer and inner cylinders are tapered structures that taper downwards.

[0014] Furthermore, a gear ring is fitted around the top of the outer wall of the inner cylinder, and multiple gears are rotatably arranged around the inside of the outer cylinder. The gears mesh with the gear ring for transmission, and one of the gears is fixedly connected to the drive shaft of the drive motor.

[0015] Furthermore, a rotating shaft is vertically fixed at the bottom of the inner cylinder, and the rotating shaft is rotatably installed at the bottom of the outer cylinder.

[0016] Furthermore, the outlet at the lower end of the feed pipe extends into the bottom of the inner cylinder, and multiple stirring rods are fixed on the outer wall of the feed pipe.

[0017] Furthermore, the extrusion mechanism includes a horizontally arranged extrusion cylinder, an electric push rod at the rear end of the extrusion cylinder, a push rod of the electric push rod extending into the extrusion cylinder, a push plate installed at the end of the push rod extending into the extrusion cylinder, an extrusion port at the front end of the extrusion cylinder, and the discharge pipe connected to the front end of the extrusion cylinder.

[0018] Furthermore, a piston sleeve is fastened to the outer end of the extrusion port of the extrusion cylinder, and a piston head is slidably installed inside the sleeve. A sliding rod is fixed to the rear end of the piston head, and a compression spring is fitted on the sliding rod. A discharge hole is provided at one end of the piston sleeve near the extrusion cylinder, and an extrusion tube is provided at the discharge hole.

[0019] Furthermore, when the extrusion barrel is not extruding material, the piston head blocks the extrusion port of the extrusion barrel, and the side wall of the piston head blocks the discharge port of the piston sleeve.

[0020] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0021] The heating rod is placed inside the inner cylinder, which can transfer heat to the plastic slurry in the extrusion channel. This allows the heating rod to heat the plastic slurry on both the inside and outside of the inner cylinder simultaneously, and internal heating also prevents heat loss.

[0022] The electric actuator's stroke can precisely control the extrusion volume per cycle. When the electric actuator drives the pusher plate to push outward, the plastic slurry pushes the piston head to slide backward, causing the plastic slurry to flow from the extrusion barrel to the front end of the piston sleeve and be discharged from the extrusion tube, thus achieving quantitative discharge.

[0023] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a schematic diagram of the extrusion mechanism.

[0026] In the picture,

[0027] 1-Outer cylinder, 2-Inner cylinder, 3-Feed pipe, 4-Discharge port, 5-Gear, 6-Gear ring, 7-Stirring rod, 8-Spiral blade, 9-Heating rod, 10-Rotating shaft, 11-Discharge pipe, 12-One-way valve, 13-Extrusion cylinder, 14-Push plate, 15-Electric push rod, 16-Piston head, 17-Piston sleeve, 18-Sliding rod, 19-Extrusion tube, 20-Drive motor. Detailed Implementation

[0028] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0029] As shown in the figure, this utility model provides a high-efficiency screw-type plastic extruder, including an outer cylinder 1, an inner cylinder 2 rotatably installed inside the outer cylinder 1, and the gap between the outer wall of the inner cylinder 2 and the inner wall of the outer cylinder 1 forms an extrusion channel;

[0030] The lower end of the outer wall of the inner cylinder 2 is provided with a spiral blade 8, and the outer end of the spiral blade 8 abuts against the inner wall of the outer cylinder 1; the feed pipe 3 is coaxially provided at the central axis position of the inner cylinder 2, and a heating rod 9 is provided on the inner wall of the inner cylinder 2, and the inner cylinder 2 is rotatably arranged relative to the feed pipe 3.

[0031] The inner cylinder 2 has a discharge port 4 on the upper side wall and a sealing device at the lower end.

[0032] This utility model also includes an extrusion mechanism, and the extrusion channel at the bottom of the outer cylinder 1 is connected to the extrusion mechanism through the discharge pipe 11.

[0033] The lower ends of both the outer cylinder 1 and the inner cylinder 2 are tapered structures that taper downwards.

[0034] A gear ring 6 is fitted around the top of the outer wall of the inner cylinder 2, and multiple gears 5 are rotatably arranged around the inside of the outer cylinder 1. The gears 5 mesh with the gear ring 6 for transmission, and one of the gears 5 is fixedly connected to the drive shaft of the drive motor 20.

[0035] The bottom of the inner cylinder 2 is vertically fixed with a rotating shaft 10, which is rotatably installed at the bottom of the outer cylinder 1.

[0036] Furthermore, the outlet at the lower end of the feed pipe 3 extends into the bottom of the inner cylinder 2, and multiple stirring rods 7 are fixed on the outer wall of the feed pipe 3.

[0037] The extrusion mechanism includes a horizontally arranged extrusion barrel 13. An electric push rod 15 is located at the rear end of the extrusion barrel 13, with its push rod extending into the extrusion barrel 13. A pusher plate 14 is installed at the end of the push rod that extends into the extrusion barrel 13. An extrusion port is located at the front end of the extrusion barrel 13. The discharge pipe 11 is connected to the front end of the extrusion barrel 13. A one-way valve 12 is installed on the discharge pipe 11, ensuring that the liquid material can only flow from the extrusion channel to the extrusion mechanism and cannot flow backwards.

[0038] A piston sleeve 17 is fastened to the outer end of the extrusion port of the extrusion cylinder 13. A piston head 16 is slidably installed inside the sleeve 17. A sliding rod 18 is fixed to the rear end of the piston head 16. A compression spring is fitted on the sliding rod 18. A discharge hole is provided at one end of the piston sleeve 17 near the extrusion cylinder 13. An extrusion tube 19 is provided at the discharge hole.

[0039] When the extrusion cylinder 13 is not extruding material, the piston head 16 blocks the extrusion port of the extrusion cylinder 13, and the side wall of the piston head 16 blocks the discharge port of the piston sleeve 17.

[0040] The specific working principle of this utility model:

[0041] The plastic slurry flows from the feed pipe 3 into the inner cylinder 2. The gear 5 drives the gear ring 6 to rotate, thereby rotating the inner cylinder 2. The heating rod 9 inside the inner cylinder 2 further heats the plastic slurry, enhancing its fluidity and facilitating extrusion. The stirring rod 7 stirs the plastic slurry, ensuring that the various materials contained in the slurry are mixed evenly. The evenly mixed plastic slurry flows from the discharge port 4 into the extrusion channel. The rotation of the inner cylinder 2 drives the spiral blade 8 to rotate, causing the heated plastic slurry to flow from the discharge pipe 11 into the extrusion mechanism. The heating rod 9 is placed inside the inner cylinder 2, which can transfer heat to the plastic slurry in the extrusion channel. This allows the heating rod 9 to heat the plastic slurry on both the inside and outside of the inner cylinder 2 simultaneously, preventing heat loss through internal heating.

[0042] The stroke of the electric actuator 15 precisely controls the extrusion volume per cycle. The one-way valve 12 ensures that the plastic slurry can only flow from the extrusion channel to the extrusion mechanism and cannot flow backward. When the electric actuator 15 drives the pusher plate 14 to push outward, the plastic slurry pushes the piston head 16 to slide backward, causing the plastic slurry to flow from the extrusion barrel 13 to the front end of the piston sleeve 17 and be discharged from the extrusion tube 19, thus achieving quantitative discharge.

[0043] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A high-efficiency screw-type plastic extruder, characterized in that: It includes an outer cylinder (1), an inner cylinder (2) is rotatably installed inside the outer cylinder (1), and the gap between the outer wall of the inner cylinder (2) and the inner wall of the outer cylinder (1) forms an extrusion channel; The lower end of the outer wall of the inner cylinder (2) is provided with a spiral blade (8), and the outer end of the spiral blade (8) abuts against the inner wall of the outer cylinder (1); the feed pipe (3) is coaxially provided at the central axis position of the inner cylinder (2), and a heating rod (9) is provided on the inner wall of the inner cylinder (2). The inner cylinder (2) is rotatably set relative to the feed pipe (3). The inner cylinder (2) has a discharge port (4) on the upper side wall and a sealing device at the lower end. It also includes an extrusion mechanism, and the extrusion channel at the bottom of the outer cylinder (1) is connected to the extrusion mechanism through the discharge pipe (11).

2. The high-efficiency screw-type plastic extruder as described in claim 1, characterized in that: A one-way valve (12) is provided on the discharge pipe (11). The one-way valve (12) ensures that the liquid material can only flow from the extrusion channel to the extrusion mechanism and cannot flow back.

3. The high-efficiency screw-type plastic extruder as described in claim 1, characterized in that: The lower ends of both the outer cylinder (1) and the inner cylinder (2) are tapered structures that taper downwards.

4. The high-efficiency screw-type plastic extruder as described in claim 1, characterized in that: A gear ring (6) is fitted around the top of the outer wall of the inner cylinder (2), and multiple gears (5) are rotatably arranged around the inside of the outer cylinder (1). The gears (5) mesh with the gear ring (6) for transmission, and one of the gears (5) is fixedly connected to the drive shaft of the drive motor (20).

5. The high-efficiency screw-type plastic extruder as described in claim 4, characterized in that: The bottom of the inner cylinder (2) is vertically fixed with a rotating shaft (10), which is rotatably installed at the bottom of the outer cylinder (1).

6. The high-efficiency screw-type plastic extruder as described in claim 1, characterized in that: The outlet at the lower end of the feed pipe (3) extends into the bottom of the inner cylinder (2), and multiple stirring rods (7) are fixed on the outer wall of the feed pipe (3).

7. The high-efficiency screw-type plastic extruder as described in claim 1, characterized in that: The extrusion mechanism includes a horizontally arranged extrusion cylinder (13), an electric push rod (15) is provided at the rear end of the extrusion cylinder (13), the push rod of the electric push rod (15) extends into the extrusion cylinder (13), a push plate (14) is installed at the end of the push rod that extends into the extrusion cylinder (13), an extrusion port is provided at the front end of the extrusion cylinder (13), and the discharge pipe (11) is connected to the front end of the extrusion cylinder (13).

8. The high-efficiency screw-type plastic extruder as described in claim 7, characterized in that: A piston sleeve (17) is fastened to the outer end of the extrusion port of the extrusion cylinder (13). A piston head (16) is slidably installed inside the sleeve (17). A sliding rod (18) is fixed to the rear end of the piston head (16). A compression spring is fitted on the sliding rod (18). A discharge hole is provided at one end of the piston sleeve (17) near the extrusion cylinder (13). An extrusion tube (19) is provided at the discharge hole.

9. The high-efficiency screw-type plastic extruder as described in claim 8, characterized in that: When the extrusion cylinder (13) does not extrude material, the piston head (16) blocks the extrusion port of the extrusion cylinder (13), and the side wall of the piston head (16) blocks the discharge hole of the piston sleeve (17).

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