Material conveying device for double-screw extruder

Abstract

The utility model relates to the field of screw extruders, and discloses a material conveying device for a double-screw extruder, which comprises a material storage tank, a partition plate is arranged at the upper part in the material storage tank, a plurality of annularly distributed feed openings are formed in the bottom end of the partition plate, a material conveying shaft is rotatably mounted on the partition plate through a bearing, and the material conveying shaft is connected with the feed opening. A plurality of annularly distributed mixing blades are arranged at the upper half part of the material conveying shaft, three annularly distributed scraping blades are also welded on the material conveying shaft, and the lower surfaces of the scraping blades are in sliding contact with the upper surface of the partition plate. And a shielding plate is arranged in a matched mode, so that the discharging opening is continuously switched between the shielding state and the opening state, the overall discharging speed of the upper portion is low, and then materials on the upper portion can be fully mixed conveniently.

Description

Technical Field

[0001] The utility model relates to the field of screw extruders, in particular to a feeding device for a twin-screw extruder. Background Art

[0002] The screw extruder relies on the pressure and shear force generated by the rotation of the screw to fully plasticize and evenly mix the materials, and then form them through the die. It is generally divided into twin-screw extruders, single-screw extruders, multi-screw extruders, and screwless extruders. A feeding mechanism for a twin-screw extruder is disclosed in the Chinese utility model patent with the announcement number CN220562137U. The feeding mechanism is provided with a stirring rod and a guide barrel. The stirring rod is rotated to break up the raw materials on the inner wall to prevent them from accumulating at the feeding port, and the guide barrel moves up and down to achieve a better effect when feeding.

[0003] With respect to the above-mentioned related technologies, the inventor believes that there are the following defects: after the materials in the feed barrel are put into the interior, the various materials inside need to be fully mixed. In the above structure, the stirring rod is provided to break up and mix the materials, but the one below it is directly connected to the twin-screw extruder through an opening, and the materials put into the feed barrel are usually transported out before they are fully mixed. For this reason, we designed a feeding device for a twin-screw extruder. Utility Model Content

[0004] In order to solve the technical problem of insufficient mixing of materials put into a feeding barrel, the utility model provides a feeding device for a twin-screw extruder.

[0005] The utility model is implemented by the following technical scheme: a feeding device for a twin-screw extruder, comprising a material storage tank, a partition plate is arranged above the inside of the material storage tank, a plurality of feeding ports distributed in an annular pattern are opened at the bottom end of the partition plate, a feeding shaft is rotatably mounted on the partition plate through a bearing, a plurality of mixing blades in annular pattern are arranged on the upper half of the feeding shaft, and three scraping blades distributed in annular pattern are welded on the feeding shaft, and the lower surface of the scraping blade is in sliding contact with the upper surface of the partition plate;

[0006] A baffle plate is installed on the outer ring surface of the feed shaft, and the baffle plate is located below the partition plate and in sliding contact with its lower surface. The baffle plate is provided with baffle leaves, and the size and shape of the baffle leaves are consistent with the size and shape of the discharge port. When the baffle leaves rotate with the feed shaft, the discharge port can be blocked and opened, so that the overall discharge rate above is lower, thereby facilitating sufficient mixing of the material above.

[0007] As a further improvement of the above scheme, a feed pipe is welded at the bottom of the storage tank, and a mounting flange is welded at the bottom of the outer surface of the feed pipe, and the mounting flange is used to connect with the inlet of the twin-screw extruder to facilitate the internal material transportation;

[0008] The bottom end of the feed shaft extends into the feed pipe, and a conveying spiral blade is welded below the outer ring surface of the feed shaft, and the conveying spiral blade extends into the feed pipe. The mixed material in the discharge cavity can be discharged under the action of the conveying spiral blade without being blocked, and the discharge speed can be controlled by controlling the rotation speed of the conveying spiral blade.

[0009] As a further improvement of the above scheme, the interior of the material storage tank is divided into a material storage chamber and a material discharge chamber by a partition plate, and the material storage chamber and the material discharge chamber are connected through a discharge port. The material above the material storage chamber can flow into the material discharge chamber through the discharge port, and the discharge speed is slow, so that the material above can be fully mixed before falling.

[0010] As a further improvement of the above scheme, a connecting seat is installed on the feed shaft, and the three scraper blades are welded to the outer ring surface of the connecting seat, and the outer ring surface of the connecting seat is tangent to the inward surface of the discharge port. The two ends of the discharge port are semicircular structures, which makes it easy to process, and the bottom end of the connecting seat is a circular structure. The two are tangent, so that there is no gap between the connecting seat and the discharge port, so that all the materials inside fall down without any residue. An inclined surface is arranged above the connecting seat, and the design of the inclined surface ensures that there will be no residue above the connecting seat.

[0011] As a further improvement of the above solution, the partition plate has a conical structure, and the structure of the scraper blade matches that of the partition plate, so that the material on the partition plate can slide down along its outer wall without leaving any residue.

[0012] As a further improvement of the above scheme, the mixing blades are welded obliquely on the outer ring surface of the feed shaft, and the inclination direction of the feed shaft is the same as the rotation direction of the conveying spiral blades, which facilitates the rotation of the mixing blades and enables the internal materials to be mixed more fully.

[0013] Compared with the prior art, the beneficial effects of the present invention are:

[0014] 1. The utility model sets a conical partition plate on the upper part of the storage tank, and a material discharge port is set on the partition plate, and a shielding plate is set to make the material discharge port switch between shielding and opening, so that the overall material discharge rate on the upper part is low, so as to facilitate the full mixing of the material on the upper part;

[0015] 2. By extending the feed shaft into the discharge pipe, and the feed shaft is provided with a conveying spiral blade, the mixed material in the discharge chamber can be discharged under the action of the conveying spiral blade without being blocked. Controlling the rotation speed of the conveying spiral blade can also control the discharge speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the overall structure of a feeding device for a twin-screw extruder provided by the utility model;

[0017] Figure 2 for Figure 1 Schematic cross-sectional view of ;

[0018] Figure 3 It is a schematic diagram of the structure of the partition plate, the feeding shaft, the conveying spiral blade, and the shielding plate;

[0019] Figure 4 for Figure 3 Schematic diagram of the structure without the partition plate installed.

[0020] Description of main symbols:

[0021] 1. Storage tank; 11. Feed pipe; 12. Mounting flange; 13. Storage chamber; 14. Feed chamber; 2. Partition plate; 21. Feed port; 3. Feed shaft; 4. Mixing blade; 5. Scraping blade; 6. Conveying spiral blade; 7. Baffle plate; 8. Connecting seat; 81. Inclined surface. DETAILED DESCRIPTION

[0022] The present invention is further described below in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form a new embodiment.

[0023] Example:

[0024] Please combine Figure 1-Figure 4 A feeding device for a twin-screw extruder of the present embodiment comprises a storage tank 1, a partition plate 2 is arranged above the storage tank 1, a plurality of feeding ports 21 distributed in an annular pattern are provided at the bottom end of the partition plate 2, a feeding shaft 3 is rotatably mounted on the partition plate 2 through a bearing, a plurality of mixing blades 4 are arranged in annular pattern on the upper half of the feeding shaft 3, and three scraping blades 5 distributed in annular pattern are welded on the feeding shaft 3, and the lower surface of the scraping blade 5 is in sliding contact with the upper surface of the partition plate 2;

[0025] A baffle plate 7 is installed on the outer ring surface of the feed shaft 3. The baffle plate 7 is located below the partition plate 2 and is in sliding contact with its lower surface. A baffle leaf is provided on the baffle plate 7. The size and shape of the baffle leaf are consistent with the size and shape of the discharge port 21. When the baffle leaf rotates with the feed shaft 3, the discharge port 21 can be blocked or opened, so that the overall discharge rate above is lower, thereby facilitating sufficient mixing of the material above.

[0026] A feeding pipe 11 is welded at the bottom of the storage tank 1, and a mounting flange 12 is welded at the bottom of the outer surface of the feeding pipe 11. The mounting flange 12 is used to connect with the inlet of the twin-screw extruder to facilitate the internal material transportation;

[0027] The bottom end of the feed shaft 3 extends into the feed pipe 11, and a conveying spiral blade 6 is welded below the outer ring surface of the feed shaft 3. The conveying spiral blade 6 extends into the feed pipe 11. The mixed material in the discharge chamber 14 can be discharged under the action of the conveying spiral blade 6 without being blocked. Controlling the rotation speed of the conveying spiral blade 6 can also control the discharge speed.

[0028] The interior of the storage tank 1 is divided into a storage chamber 13 and a discharge chamber 14 by a partition plate 2, and the storage chamber 13 and the discharge chamber 14 are connected through a discharge port 21. The material above the storage chamber 13 can flow into the discharge chamber 14 through the discharge port 21, and the discharge speed is slow, so that the material above can be fully mixed before falling.

[0029] A connecting seat 8 is installed on the feed shaft 3, and three scraper blades 5 are welded to the outer ring surface of the connecting seat 8, and the outer ring surface of the connecting seat 8 is tangent to the inner side surface of the discharge port 21. The two ends of the discharge port 21 are semicircular structures, which makes it easy to process, and the bottom end of the connecting seat 8 is a circular structure. The two are tangent, so that there is no gap between the connecting seat 8 and the discharge port 21, so that all the materials inside fall down without any residue. A slope 81 is arranged above the connecting seat 8. The design of the slope 81 ensures that there is no residue above the connecting seat 8.

[0030] The partition plate 2 has a conical structure, and the structure of the scraper blade 5 matches that of the partition plate 2, so that the material on the partition plate 2 can slide down along the outer wall thereof without leaving any residue.

[0031] The mixing blades 4 are welded obliquely on the outer ring surface of the feeding shaft 3 , and the inclination direction of the feeding shaft 3 is the same as the rotation direction of the conveying spiral blades 6 , which facilitates the rotation of the mixing blades 4 and enables the internal materials to be mixed more fully.

[0032] The implementation principle of a feeding device for a twin-screw extruder in the embodiment of the present application is as follows: in actual use, the feed pipe is connected to the inlet of the twin-screw extruder through the mounting flange 12, and the upper end of the feed shaft 3 is connected to the output shaft of an external driving motor. When the output shaft of the driving motor rotates, the feed shaft 3 can be rotated synchronously. At this time, a variety of materials can be added to the storage chamber 13 above the storage tank 1. While the feed shaft 3 is rotating, the baffle plate 7 will also rotate. The rotating baffle plate 7 can continuously block and keep away from the feed port 21, so that the feed port 21 is intermittently opened, so that the material discharge rate inside the storage chamber 13 is low, so that it can be fully mixed, and the scraping blade 5 can scrape the material below when rotating, so that the material can move to the top of the feed port 21, so that there will be no residual material, and the material falling into the feed chamber 14 will enter the inlet of the twin-screw extruder through the pipeline under the action of the conveying spiral blade 6, so that it will not be blocked;

[0033] By arranging a conical partition plate 2 above the inside of the storage tank 1, a material discharge port 21 is arranged on the partition plate 2, and a shielding plate 7 is arranged so that the material discharge port 21 is continuously switched between the shielding state and the opening state, so that the overall material discharge rate above is low, thereby facilitating sufficient mixing of the material above;

[0034] By extending the feed shaft 3 into the discharge pipe, and the feed shaft 3 is provided with a conveying spiral blade 6, the mixed material in the discharge chamber 14 can be discharged under the action of the conveying spiral blade 6 without being blocked, and controlling the rotation speed of the conveying spiral blade 6 can also control the discharge speed.

[0035] The above-mentioned implementation modes are only preferred implementation modes of the present invention, and cannot be used to limit the protection scope of the present invention. Any non-substantial changes and substitutions made by technicians in this field on the basis of the present invention shall fall within the scope of protection required by the present invention.

Claims

1. A feeding device for a twin-screw extruder, comprising a storage tank (1), characterized in that: A partition plate (2) is arranged above the inside of the storage tank (1), and a plurality of feeding ports (21) distributed in an annular shape are provided at the bottom end of the partition plate (2). A feeding shaft (3) is rotatably mounted on the partition plate (2) via a bearing, and a plurality of mixing blades (4) are arranged in annular shapes on the upper half of the feeding shaft (3). Three scraping blades (5) distributed in annular shapes are also welded to the feeding shaft (3), and the lower surface of the scraping blade (5) is in sliding contact with the upper surface of the partition plate (2); A baffle plate (7) is installed on the outer ring surface of the feed shaft (3), and the baffle plate (7) is located below the partition plate (2) and is in sliding contact with its lower surface. The baffle plate (7) is provided with a baffle leaf, and the size and shape of the baffle leaf are consistent with the size and shape of the feed port (21).

2. A feeding device for a twin-screw extruder as claimed in claim 1, characterized in that: A material delivery pipe (11) is welded to the bottom end of the material storage tank (1), and a mounting flange (12) is welded to the bottom end of the outer surface of the material delivery pipe (11); The bottom end of the feed shaft (3) extends into the feed pipe (11), and a conveying spiral blade (6) is welded below the outer ring surface of the feed shaft (3), and the conveying spiral blade (6) extends into the feed pipe (11).

3. A feeding device for a twin-screw extruder as claimed in claim 1, characterized in that: The interior of the material storage tank (1) is divided into a material storage chamber (13) and a material discharge chamber (14) by a partition plate (2), and the material storage chamber (13) and the material discharge chamber (14) are connected through a discharge port (21).

4. A feeding device for a twin-screw extruder as claimed in claim 1, characterized in that: A connecting seat (8) is installed on the feeding shaft (3), and the three scraping blades (5) are welded to the outer ring surface of the connecting seat (8). The outer ring surface of the connecting seat (8) is tangent to the inner side surface of the discharge port (21), and an inclined surface (81) is arranged above the connecting seat (8).

5. A feeding device for a twin-screw extruder as claimed in claim 4, characterized in that: The partition plate (2) has a conical structure, and the structure of the scraping blade (5) matches the structure of the partition plate (2).

6. A feeding device for a twin-screw extruder as claimed in claim 2, characterized in that: The mixing blades (4) are welded obliquely to the outer ring surface of the feeding shaft (3), and the inclination direction of the feeding shaft (3) is the same as the rotation direction of the conveying spiral blades (6).

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