Screw extruder for PLA (polylactic acid) sheet production

Abstract

The utility model discloses a PLA (polylactic acid) sheet production screw extruder which comprises a base and an extruder main body, the extruder main body is arranged at the top of the base, one side of the top of the extruder main body is fixedly connected with a supporting seat, a feeding tank is arranged in the supporting seat, the left side of the base is fixedly connected with a cooling box, and the left side of the cooling box is fixedly connected with a screw rod. A first motor is fixedly connected to the middle of the top side of the feeding tank, a mounting plate is clamped and fixed to the left side of the feeding tank, and a feeding pipe is connected to the upper portion of the right side of the feeding tank in a penetrating mode, so that materials are dried, and the situation that bubbles and air holes exist in extruded sheets due to the fact that the water content of material particles is too high is prevented; according to the invention, the material particles inside can be more comprehensively dried, the drying efficiency is further improved, and the timely cooling and molding can effectively avoid the wrinkling condition of the extruded sheet and avoid the deformation condition of the product at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of PLA sheet production, in particular to a screw extruder for PLA sheet production. Background Art

[0002] The screw extruder is composed of an Archimedean screw rotating in a heated barrel. It consists of a feeding device and an extrusion device. It is widely used due to its simple structure, easy manufacturing, high processing efficiency and low price. It is currently the most mature and most widely used type of extruder.

[0003] In the prior art, application number 201921852781.1 discloses a screw for an efficient PLA biodegradable material extruder, comprising an extruder body, a feeding port and a threaded rod, wherein the feeding port is arranged on the extruder body, and the threaded rod is arranged in the extruder body and located on one side of the feeding port; the above-mentioned device only improves the overall structure of the screw, and does not improve the drying and cooling of the material at the feed end and the discharge end. Materials with too high water content will cause bubbles and air holes in the sheet, which greatly affects the extrusion production quality and the effect of rapid cooling and shaping after discharge.

[0004] Currently, no effective solution has been proposed for the problems in the related technologies. Utility Model Content

[0005] In view of the problems in the related technology, the utility model proposes a screw extruder for producing PLA sheets to overcome the above technical problems existing in the existing related technology.

[0006] To this end, the specific technical solutions adopted by the utility model are as follows:

[0007] A screw extruder for producing PLA sheets comprises a base and an extruder body, wherein the extruder body is arranged on the top of the base, a support base is fixedly connected to one side of the top of the extruder body, a feed tank is arranged inside the support base, a cooling box is fixedly connected to the left side of the base, a first motor is fixedly connected to the middle of the top side of the feed tank, a mounting plate is fixedly engaged with the left side of the feed tank, and a feeding pipe is connected through the upper right side of the feed tank.

[0008] Preferably, the output shaft of the first motor extends into the inner cavity of the feed tank and is fixedly connected to a rotating shaft, and push plates are symmetrically provided on the outer wall of the rotating shaft. A pneumatic butterfly valve is fixedly connected through the middle of the bottom side of the feed tank.

[0009] Preferably, arc-shaped plates are fixed through the upper and lower sides of the outer side of the mounting plate, the inner side of the arc-shaped plate passes through the mounting plate and the inside of the feed tank in sequence, and a barrier net is fixedly connected through the inner wall of the arc-shaped plate.

[0010] Preferably, the barrier nets all penetrate the inner cavity of the feed tank and are flush with the inner wall of the feed tank, and electric heating tubes are equidistantly provided between the upper and lower parts of the arc-shaped plate wall cavity.

[0011] Preferably, the support seat is specifically an L-shaped structure, and a second motor is fixedly connected to the upper left side of the support seat. The output shaft of the second motor passes through the inner side of the support seat and is fixedly connected to the arc plate.

[0012] Preferably, a feed pipe is connected through the bottom side of the inner wall of the support seat, the bottom end of the feed pipe is fixedly connected to the feed end of the extruder body, a bellows is fixedly connected to the top end of the feed pipe, and the bottom end of the bellows and the bottom end of the pneumatic butterfly valve are respectively fixedly connected with flanges.

[0013] Preferably, a water storage cavity is provided on the right side of the cooling box wall cavity, a water outlet pipe is symmetrically provided on the right bottom of the inner wall of the cooling box through an electromagnetic valve, a fixed plate is fixedly connected to the left side of the cooling box, and side baffles are symmetrically provided on the top and left side of the fixed plate, a roller is connected to the upper left side of the cooling box through a bearing, and a pressure roller is connected to the lower right side of the cooling box through a bearing.

[0014] Preferably, a guide roller is provided between the upper side baffles, a third motor is fixedly connected to the outer side of the lower side baffle, a winding roller is connected between the side baffles via a bearing, and the output shaft of the third motor is fixedly connected to the front end of the winding roller.

[0015] The beneficial effects of the utility model are as follows: the material can be dried to avoid excessive humidity of the material particles affecting the quality of extrusion molding, and excessive water content of the material particles can be prevented to cause bubbles and air holes in the extruded sheet. The feed tank adjusted to a horizontal state can dry the material particles inside it more comprehensively, and the drying efficiency can be further improved. The water-cooled sheet can be automatically rolled up, and timely cooling and molding can effectively avoid wrinkles in the sheet after extrusion, and at the same time avoid product deformation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 It is a schematic diagram of the overall structure of a screw extruder for producing PLA sheets according to an embodiment of the utility model;

[0018] Figure 2 It is a schematic diagram of the internal structure of a feed tank of a screw extruder for producing PLA sheets according to an embodiment of the utility model;

[0019] Figure 3 It is a schematic diagram of the internal structure of a support base of a screw extruder for producing PLA sheets according to an embodiment of the utility model;

[0020] Figure 4 It is a schematic diagram of the internal structure of a cooling box of a screw extruder for producing PLA sheets according to an embodiment of the utility model.

[0021] In the figure:

[0022] 1. Base; 2. Extruder body; 3. Support seat; 4. Feed tank; 5. Cooling box; 6. First motor; 7. Mounting plate; 8. Feeding pipe; 9. Rotating shaft; 10. Pushing plate; 11. Pneumatic butterfly valve; 12. Arc plate; 13. Barrier net; 14. Electric heating tube; 15. Second motor; 16. Feeding pipe; 17. Bellows; 18. Flange; 19. Water storage chamber; 20. Water outlet pipe; 21. Fixed plate; 22. Side baffle; 23. Support roller; 24. Pressure roller; 25. Guide roller; 26. Third motor; 27. Winding roller. DETAILED DESCRIPTION

[0023] To further illustrate each embodiment, the present invention provides drawings, which are part of the disclosure of the present invention and are mainly used to illustrate the embodiments. They can be used in conjunction with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, ordinary technicians in the field should be able to understand other possible implementation methods and advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0024] According to an embodiment of the utility model, a screw extruder for producing PLA sheets is provided.

[0025] Embodiment 1

[0026] like Figure 1-4As shown, a screw extruder for producing PLA sheets according to an embodiment of the utility model comprises a base 1 and an extruder body 2. The extruder body 2 is arranged on the top of the base 1. A support base 3 is fixedly connected to one side of the top of the extruder body 2. A feed tank 4 is arranged inside the support base 3. A cooling box 5 is fixedly connected to the left side of the base 1. A first motor 6 is fixedly connected to the middle part of the top side of the feed tank 4. A mounting plate 7 is fixedly engaged on the left side of the feed tank 4. A feeding pipe 8 is connected through the upper right side of the feed tank 4. The output shaft of the first motor 6 extends into the inner cavity of the feed tank 4 and is fixedly connected to a rotating shaft 9. A push plate 10 is symmetrically arranged on the outer wall of the rotating shaft 9. A pneumatic butterfly valve 11 is fixedly connected through the middle part of the bottom side of the feed tank 4. Arc plates 12 are respectively fixedly connected to the upper and lower sides of the outer side of the mounting plate 7. The inner side of the arc plate 12 passes through the mounting plate 7 and the inside of the feed tank 4 in sequence. A barrier net 13 is fixedly connected through the inner wall, and the barrier nets 13 all penetrate the inner cavity of the feed tank 4 and are flush with the inner wall of the feed tank 4. Electric heating tubes 14 are equidistantly arranged between the upper and lower wall cavities of the arc plate 12, and the material particles enter the inner cavity of the feed tank 4 through the feeding pipe 8. The material in the inner cavity of the feed tank 4 can be sent into the feed end of the extruder body 2 by starting the pneumatic butterfly valve 11. When the material particles are stored in the feed tank 4, the electric heating tube 14 in the inner cavity of the arc plate 12 is started at the same time. When the electric heating tube 14 is started, heat can be charged into the inner cavity of the feed tank 4 through the barrier net 13. During the stirring and tumbling of the material particles, the charged heat can contact with the material particles to dry the material, thereby preventing the material particles from having excessive humidity that affects the quality of extrusion molding, and preventing the material particles from having excessive water content that causes bubbles and air holes in the extruded sheet.

[0027] Embodiment 2

[0028] like Figure 1-4As shown, a screw extruder for producing PLA sheets according to an embodiment of the utility model comprises a base 1 and an extruder body 2. The extruder body 2 is arranged on the top of the base 1. A support base 3 is fixedly connected to one side of the top of the extruder body 2. A feed tank 4 is arranged inside the support base 3. A cooling box 5 is fixedly connected to the left side of the base 1. A first motor 6 is fixedly connected to the middle part of the top side of the feed tank 4. A mounting plate 7 is fixedly engaged with the left side of the feed tank 4. A feeding pipe 8 is connected through the upper right side of the feed tank 4. The support base 3 is specifically an L-shaped structure. A second motor 15 is fixedly connected to the upper left side of the support base 3. The output shaft of the second motor 15 passes through the inner side of the support base 3 and is fixedly connected to the arc plate 12. A feed pipe 16 is connected through the bottom side of the inner wall of the support base 3. The bottom end of the feed pipe 16 is connected through and fixed to the feed end of the extruder body 2. The top of the feed pipe 16 is connected through and fixedly connected. The bellows 17, the bottom end of the bellows 17 and the bottom end of the pneumatic butterfly valve 11 are respectively fixedly connected with flanges 18. Before the mixed material is dried, the flange 18 at the top of the bellows 17 is separated from the flange 18 at the bottom of the pneumatic butterfly valve 11, and then the second motor 15 is started, so that the output shaft of the second motor 15 drives the feed tank 4 inside the mounting plate 7 to rotate longitudinally, so that the feed tank 4 stirs the material particles in a longitudinal horizontal state, avoiding vertical stirring that causes the accumulated materials to be unable to fully contact the hot air. The feed tank 4 adjusted to a horizontal state can dry the material particles inside it more comprehensively, and the drying efficiency is further improved. After the drying is completed, the feed tank 4 is reset, and then the bellows 17 is stretched upward, so that the flange 18 at the top of the bellows 17 and the flange 18 at the bottom of the pneumatic butterfly valve 11 are fixed by bolts.

[0029] Embodiment 3

[0030] like Figure 1-4As shown, a screw extruder for producing PLA sheets according to an embodiment of the utility model comprises a base 1 and an extruder body 2. The extruder body 2 is arranged on the top of the base 1. A support seat 3 is fixedly connected to one side of the top of the extruder body 2. A feed tank 4 is arranged inside the support seat 3. A cooling box 5 is fixedly connected to the left side of the base 1. A first motor 6 is fixedly connected to the middle part of the top side of the feed tank 4. A mounting plate 7 is fixedly engaged with the left side of the feed tank 4. A feeding pipe 8 is connected through the upper right side of the feed tank 4. A water storage cavity 19 is arranged on the right side of the wall cavity of the cooling box 5. A water outlet pipe 20 is symmetrically arranged at the bottom right side of the inner wall of the cooling box 5 through an electromagnetic valve. A fixed plate 21 is fixedly connected to the left side of the cooling box 5. Side baffles 22 are symmetrically arranged on the top and left sides of the fixed plate 21. A roller 23 is connected to the upper left side of the cooling box 5 through a bearing. A pressure roller 24 is connected to the lower right side of the cooling box 5 through a bearing. A guide roller 25 is arranged between the upper side baffles 22. A third motor 26 is fixedly connected to the outer side of the lower side baffle 22, and a winding roller 27 is connected between the side baffles 22 through a bearing. The output shaft of the third motor 26 is fixedly connected to the front end of the winding roller 27. The cold water in the water storage chamber 19 is injected into the cooling box 5 through the outlet pipe 20. After the sheet is extruded by the extruder body 2, it will enter the cooling box 5, pass through the bottom of the pressure roller 24, the right side of the supporting roller 23, and the top side of the guide roller 25 in turn, and finally be wound on the winding roller 27 for collection. The pressure roller 24 can make the discharged sheet immersed in the cooling water inside the cooling box 5, and the sheet is lifted and guided by the supporting roller 23 and the guide roller 25. The third motor 26 is started, and the output shaft of the third motor 26 drives the winding roller 27 to rotate, so that the water-cooled sheet can be automatically wound. Timely cooling and forming can effectively avoid wrinkles in the sheet after extrusion, and at the same time avoid product deformation.

[0031] In summary, with the help of the above-mentioned technical scheme of the utility model, when this device is in use, the material particles enter the inner cavity of the feed tank 4 through the feeding pipe 8, and the material in the inner cavity of the feed tank 4 can be sent to the feed end of the extruder body 2 by starting the pneumatic butterfly valve 11. When the material particles are stored in the feed tank 4, the electric heating tube 14 in the inner cavity of the arc plate 12 is started at the same time. The electric heating tube 14 can be started to charge heat into the inner cavity of the feed tank 4 through the barrier net 13. Before the mixed material is dried, the flange 18 at the top of the bellows 17 is separated from the flange 18 at the bottom of the pneumatic butterfly valve 11, and then the second motor 15 is started, so that the output shaft of the second motor 15 drives the feed tank 4 inside the mounting plate 7 to rotate longitudinally, so that the feed tank 4 stirs the material particles in a longitudinally horizontal state. In the process of stirring and tumbling of the material particles, the charged heat can be mixed with the material The particles come into contact to dry the material. After the drying is completed, the feed tank 4 is reset, and then the bellows 17 is stretched upward, so that the flange 18 at the top of the bellows 17 is fixed to the flange 18 at the bottom of the pneumatic butterfly valve 11 by bolts. The cold water in the water storage chamber 19 is injected into the cooling box 5 through the outlet pipe 20. After the sheet is extruded through the extruder body 2, it will enter the cooling box 5, pass through the bottom of the pressure roller 24, the right side of the roller 23, and the top side of the guide roller 25 in turn, and finally be wound on the winding roller 27 for collection. The pressure roller 24 can make the discharged sheet immersed in the cooling water inside the cooling box 5, and lift and guide the sheet through the roller 23 and the guide roller 25. The third motor 26 is started, and the output shaft of the third motor 26 drives the winding roller 27 to rotate, so that the water-cooled sheet can be automatically wound.

[0032] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A screw extruder for producing PLA sheets, comprising a base (1) and an extruder body (2), characterized in that: The extruder body (2) is arranged on the top of the base (1), and a support seat (3) is fixedly connected to one side of the top of the extruder body (2), and a feed tank (4) is arranged inside the support seat (3). A cooling box (5) is fixedly connected to the left side of the base (1), and a first motor (6) is fixedly connected to the middle of the top side of the feed tank (4). A mounting plate (7) is fixedly engaged on the left side of the feed tank (4), and a feeding pipe (8) is connected through the upper right side of the feed tank (4).

2. A screw extruder for producing PLA sheets according to claim 1, characterized in that: The output shaft of the first motor (6) extends into the inner cavity of the feed tank (4) and is fixedly connected to a rotating shaft (9). A push plate (10) is symmetrically provided on the outer wall of the rotating shaft (9). A pneumatic butterfly valve (11) is fixedly connected to the middle of the bottom side of the feed tank (4).

3. A screw extruder for producing PLA sheets according to claim 2, characterized in that: Arc plates (12) are respectively fixedly passed through the upper and lower sides of the outer side of the mounting plate (7); the inner side of the arc plate (12) passes through the mounting plate (7) and the inside of the feed tank (4) in sequence; and a barrier net (13) is fixedly connected to the inner wall of the arc plate (12).

4. A screw extruder for producing PLA sheets according to claim 3, characterized in that: The barrier nets (13) all penetrate the inner cavity of the feed tank (4) and are flush with the inner wall of the feed tank (4). Electric heating pipes (14) are equidistantly arranged between the upper and lower wall cavities of the arc-shaped plate (12).

5. A screw extruder for producing PLA sheets according to claim 4, characterized in that: The support seat (3) is specifically an L-shaped structure, and a second motor (15) is fixedly connected to the upper left side of the support seat (3). The output shaft of the second motor (15) passes through the inner side of the support seat (3) and is fixedly connected to the arc plate (12).

6. A screw extruder for producing PLA sheets according to claim 5, characterized in that: A feed pipe (16) is connected through the bottom side of the inner wall of the support seat (3), the bottom end of the feed pipe (16) is fixedly connected through the feed end of the extruder body (2), the top end of the feed pipe (16) is fixedly connected through a bellows (17), and the bottom end of the bellows (17) and the bottom end of the pneumatic butterfly valve (11) are respectively fixedly connected with a flange (18).

7. A screw extruder for producing PLA sheets according to claim 6, characterized in that: A water storage cavity (19) is provided on the right side of the wall cavity of the cooling box (5); a water outlet pipe (20) is symmetrically provided at the bottom of the right side of the inner wall of the cooling box (5) via a solenoid valve; a fixing plate (21) is fixedly connected to the left side of the cooling box (5); side baffles (22) are symmetrically provided on the top and left side of the fixing plate (21); a roller (23) is connected to the upper left side of the interior of the cooling box (5) via a bearing; and a pressure roller (24) is connected to the lower right side of the interior of the cooling box (5) via a bearing.

8. A screw extruder for producing PLA sheets according to claim 7, characterized in that: A guide roller (25) is provided between the upper side baffles (22), a third motor (26) is fixedly connected to the outer side of the lower side baffle (22), a winding roller (27) is connected between the side baffles (22) via a bearing, and an output shaft of the third motor (26) is fixedly connected to the front end of the winding roller (27).

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