Vacuum gland plate for plastic extruder

Abstract

This utility model relates to the technical field of components for twin-screw plastic extruders, specifically to a vacuum capping plate for a plastic extruder. It employs a square capping plate and a cap body. The square capping plate has an exhaust port on the right side near the cap body. The cap body includes a first baffle and a second baffle, both integrally structured. The bottom surface of the first baffle is concave. When this vacuum capping plate is installed on the top of the twin-screw extruder barrel, the cap body is on the left and the exhaust port is on the right. During the counter-clockwise rotation of the twin screws, the material shifts to the left, which helps reduce material leakage from the exhaust port. Because the bottom surface of the second baffle slopes downwards from the side near the exhaust port to the side near the first baffle, and the side of the second baffle near the exhaust port extends with a ramp, it ensures a wider exhaust port and blocks and guides the material between the twin screws to the concave surface of the first baffle, preventing material from being carried onto the exhaust port and effectively reducing material leakage / blockage of the capping plate.

Description

Technical Field

[0001] This utility model relates to the technical field of components for twin-screw plastic extruders, specifically to a vacuum pressure plate for a plastic extruder. Background Technology

[0002] Twin-screw plastic extruders rely on the pressure and shear force generated by the rotating screw to fully plasticize and uniformly mix materials, which are then formed through a die. Existing screw extruders, to meet vacuum requirements, have a pressure plate and a vacuum exhaust chamber at the top of the barrel. During the process of venting air from the barrel to the pressure plate and vacuum exhaust chamber, the exhaust port of the pressure plate, located at the middle end and shaped like a funnel (narrower at the top and wider at the bottom), can instantly pull material out of the exhaust port during vacuuming, easily causing material overflow / blockage at the pressure plate. Summary of the Invention

[0003] In order to overcome the shortcomings and deficiencies of the existing technology, the purpose of this utility model is to provide a vacuum pressure plate for a plastic extruder.

[0004] The purpose of this utility model is achieved through the following technical solution: a vacuum cover plate for a plastic extruder, used to cover the top of the barrel of a twin-screw extruder, including a square cover plate and a cover body extending from the bottom of the square cover plate. The square cover plate has an exhaust port on the right side near the cover body. The cover body includes a first baffle part and a second baffle part with an integral structure. The bottom surface of the first baffle part is a concave arc surface. The bottom surface of the second baffle part slopes downward from the side near the exhaust port to the side near the first baffle part. The side of the second baffle part near the exhaust port extends with a slope.

[0005] Preferably, the width of the concave arc surface of the first baffle gradually increases along the material output direction of the twin-screw extruder.

[0006] Preferably, the width of the bottom surface of the second baffle gradually decreases along the material output direction of the twin-screw extruder.

[0007] Preferably, the exhaust port is a rounded rectangular opening.

[0008] Preferably, the square cover plate has mounting and positioning holes at all four corners; and threaded through holes on both sides of the square cover plate.

[0009] Preferably, the four corners of the square cover plate are rounded.

[0010] The beneficial effects of this utility model are as follows: The vacuum cover plate of this utility model for a plastic extruder is used to cover the top of the barrel of a twin-screw extruder. It adopts a square cover plate and a cover body extending from the bottom of the square cover plate. The square cover plate has an exhaust port on the right side near the cover body. The cover body includes a first baffle and a second baffle with an integral structure. The bottom surface of the first baffle is a concave arc surface. When the twin screws rotate counterclockwise, when the vacuum cover plate is installed on the top of the barrel of the twin-screw extruder, the cover body is on the left and the exhaust port is on the right. During the rotation of the twin screws, the material shifts to the left, which helps to reduce the degree of material leakage from the exhaust port. Since the bottom surface of the second baffle slopes downward from the side near the exhaust port to the side near the first baffle, and the side of the second baffle near the exhaust port has a slope, it helps to ensure a larger exhaust port width and also helps to block and guide the material between the twin screws to the concave arc surface of the first baffle, which helps to prevent the material from being carried to the exhaust port and effectively reduces the occurrence of material leakage / blockage of the cover plate. Attached Figure Description

[0011] Figure 1 This is a cross-sectional schematic diagram of the present invention;

[0012] Figure 2 This is a schematic diagram of the structure of this utility model;

[0013] Figure 3 This is a structural schematic diagram from another perspective of the present invention;

[0014] Figure 4 This is a schematic diagram of the application of this utility model in a twin-screw extruder.

[0015] The attached figures are labeled as follows: 1. Square cover plate; 2. Cover body; 21. First baffle; 22. Second baffle; 3. Exhaust port; 4. Slope; 5. Mounting positioning hole; 6. Threaded through hole; 7. Twin screw; 8. Barrel. Detailed Implementation

[0016] To facilitate understanding by those skilled in the art, the present invention will be further described below with reference to embodiments and accompanying drawings. The content mentioned in the embodiments is not intended to limit the present invention.

[0017] like Figures 1-4As shown, a vacuum cover plate for a plastic extruder is used to cover the top of the barrel 8 of a twin-screw extruder. It includes a square cover plate 1 and a cover body 2 extending from the bottom of the square cover plate 1. The square cover plate 1 has an exhaust port 3 on the right side near the cover body 2. The cover body 2 includes a first baffle part 21 and a second baffle part 22 with an integral structure. The bottom surface of the first baffle part 21 is a concave arc surface. The bottom surface of the second baffle part 22 slopes downward from the side near the exhaust port 3 to the side near the first baffle part 21. A ramp 4 extends from the side of the second baffle part 22 near the exhaust port 3.

[0018] The vacuum pressure plate of this plastic extruder, in this embodiment, is exemplified by the counterclockwise rotation of the twin-screw 7. Figure 4 As shown, when the vacuum cap plate is installed on the top of the barrel 8 of the twin-screw extruder, the cap 2 is located on the left and the vent 3 is located on the right. During the rotation of the twin screws 7, the material shifts to the left, which helps to reduce the degree of material overflow from the vent 3. Since the bottom surface of the second baffle 22 slopes downward from the side near the vent 3 to the side near the first baffle 21, and the side of the second baffle 22 near the vent 3 has an extension of the ramp 4, it is beneficial to ensure a larger width of the vent 3 and to block and guide the material at the top between the twin screws 7 to the concave arc surface of the first baffle 21, which helps to prevent the material from being carried onto the vent 3 and effectively reduces the occurrence of material overflow / blockage of the cap plate.

[0019] Furthermore, the width of the concave arc surface of the first baffle 21 gradually increases along the material output direction of the twin-screw extruder, and the width of the bottom surface of the second baffle 22 gradually decreases along the material output direction of the twin-screw extruder; this is beneficial for guiding the material at the top of the twin-screw 7 along the second baffle 22 to the concave arc surface of the first baffle 21 during actual use, so that the material is gradually depressurized and the vacuum cover plate is prevented from overflowing. Figure 3 In this context, the material output direction of a twin-screw extruder is represented by A.

[0020] Furthermore, the exhaust port 3 is a rounded rectangular opening. Even further, the length of the exhaust port 3 is 0.5-0.8 times the length of the square cover plate 1; preferably, the length of the exhaust port 3 is 0.6 times the length of the square cover plate 1. Compared to traditional exhaust holes, the exhaust port 3 in this design is larger, which is more conducive to preventing material leakage / blockage at the exhaust port 3. Moreover, the exhaust port 3 is longer, and since the exhaust port 3 is located on the right side in this embodiment, if there is material leakage in the front half of the exhaust port 3 along the material output direction of the twin-screw extruder, the rear half of the exhaust port 3 can still exhaust normally.

[0021] Furthermore, mounting positioning holes 5 are provided at each of the four corners of the square cover plate 1; threaded through holes 6 are provided on both sides of the square cover plate 1. In practical applications, a vacuum exhaust chamber also needs to be installed on the top of the vacuum cover plate. The purpose of the mounting positioning holes 5 is to provide clearance and positioning when the barrel 8 and the vacuum exhaust chamber are connected by bolts. The vacuum cover plate is fixed to the barrel 8 by means of a screw thread passing through the threaded through hole 6 and being fixed with the screw thread of the barrel 8.

[0022] Furthermore, the four corners of the square cover plate 1 are rounded, which provides protection and prevents workers or other parts from touching the four corners of the square cover plate 1 and getting scratched.

[0023] The above embodiments are preferred implementations of this utility model. In addition, this utility model can also be implemented in other ways. Any obvious substitutions without departing from the concept of this utility model are within the protection scope of this utility model.

Claims

1. A vacuum cover plate for a plastic extruder, used to cover the top of the barrel of a twin-screw extruder, characterized in that: The device includes a square cover plate and a cover body extending from the bottom of the square cover plate. The square cover plate has an exhaust port on the right side near the cover body. The cover body includes a first baffle and a second baffle with an integral structure. The bottom surface of the first baffle is a concave arc surface. The bottom surface of the second baffle slopes downward from the side near the exhaust port to the side near the first baffle. The side of the second baffle near the exhaust port extends with a slope.

2. The vacuum pressure plate for a plastic extruder according to claim 1, characterized in that: The width of the concave arc surface of the first baffle gradually increases along the material output direction of the twin-screw extruder.

3. The vacuum pressure plate for a plastic extruder according to claim 1, characterized in that: The width of the bottom surface of the second baffle gradually decreases along the material output direction of the twin-screw extruder.

4. The vacuum pressure plate for a plastic extruder according to claim 1, characterized in that: The exhaust port is a rounded rectangular opening.

5. The vacuum pressure plate for a plastic extruder according to claim 1, characterized in that: The square cover plate has mounting and positioning holes at all four corners; and threaded through holes on both sides of the square cover plate.

6. The vacuum pressure plate for a plastic extruder according to claim 1, characterized in that: The four corners of the square cover plate are all rounded.

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