Tandem disc type extruder

Abstract

The invention relates to the technical field of tandem disc screw extruders, and discloses a tandem disc extruder which comprises a driving part, a transmission assembly in transmission connection with the driving part, and a main body in transmission connection with the transmission assembly, the main body comprises a millstone structure; the millstone structure at least comprises a millstone assembly. The grinding disc assembly comprises a movable piece arranged on the mandrel in a sleeving mode, a first static piece fixed to the inner wall of the barrel and arranged outside the movable piece in a sleeving mode, a second static piece fixed to the inner wall of the barrel and arranged close to the first static piece, and a second screw arranged outside the mandrel in a sleeving mode and corresponding to the second static piece. Static piece grinding grooves are formed in the left side walls and the right side walls of the first static piece and the second static piece correspondingly, movable piece grinding grooves are formed in the left side wall and the right side wall of the movable piece correspondingly, and a spiral groove is formed in the circumferential face of the movable piece. The grinding disc structure composed of the movable piece and the static piece is arranged in the cylinder body, and the grinding grooves in the movable piece and the static piece are matched with each other, so that materials are mixed, stirred and dispersed more uniformly.

Description

Technical Field

[0001] The invention relates to the technical field of tandem disc screw extruders, in particular to a tandem disc extruder. Background Art

[0002] The tandem disc extruder granulator is a composite equipment that combines extrusion process and disc granulation technology, and is mainly used for the continuous production of polymer materials, chemical fillers and organic fertilizers. Its core design realizes the mixing, plasticization, molding and granulation of materials through a multi-stage tandem structure, which is both efficient and flexible. The material mixing process mainly relies on the grinding disc part, but the grinding disc part of the existing tandem disc extruder has a single structure and relies heavily on the extrusion effect between the grinding discs to process the material; for example, the Chinese invention patent with the document number CN105729756A and the name of the grinding disc structure of the tandem grinding disc screw extruder, this grinding disc structure is not good enough for mixing, stretching, uniform dispersion, etc., especially for nano-scale ultrafine calcium powder, and powders with flaky molecular structures, flame-retardant aramid materials, etc. The processing effect is not good, so a tandem disc extruder that can mix and stir materials and disperse them more evenly is needed. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a tandem disc extruder, which provides a grinding disc structure composed of a moving disc and a stationary disc in a cylinder, and the grinding grooves on the moving disc and the stationary disc cooperate with each other to mix and stir the materials and disperse them more evenly.

[0004] To achieve the above object, the present invention adopts the following technical solution: a tandem disc extruder, comprising a driving component, a transmission assembly drivingly connected to the driving component, and a main body drivingly connected to the transmission assembly; The main body comprises a cylinder, a core shaft arranged transversely inside the cylinder, a feeding structure, a grinding disc structure and a conveying output structure arranged in sequence from right to left inside the cylinder; The grinding disc structure comprises at least three groups of grinding disc assemblies sequentially arranged on the mandrel; the grinding disc assembly comprises a moving piece sleeved on the mandrel, a first static piece fixed to the inner wall of the cylinder and sleeved outside the moving piece, a second static piece fixed to the inner wall of the cylinder and arranged close to the first static piece, and a second screw sleeved outside the mandrel and corresponding to the second static piece; There is a gap between the inner circle of the first static plate and the outer circle of the dynamic plate, there is a gap between the first dynamic plate and the side wall of the second static plate, and there is a gap between the second static plate and the second screw rod; The left and right walls of the first and second static plates are both provided with static plate grinding grooves, the left and right walls of the dynamic plate are both provided with dynamic plate grinding grooves, and the circumferential surface of the dynamic plate is provided with a spiral groove.

[0005] Furthermore, the driving component adopts a motor, and the motor, transmission assembly and main body are all installed on a workbench.

[0006] Furthermore, the thickness of the moving piece is smaller than the thickness of the first static piece, and the thickness of the second screw rod is larger than the thickness of the second static piece.

[0007] Furthermore, the inner circles of the first and second static plates are sequentially provided with second grinding grooves along the circumferential direction; one end of the static plate grinding groove protrudes into the interior of the first and second static plates, and one end of the moving plate grinding groove protrudes out of the moving plate.

[0008] Furthermore, the feeding structure includes a feeding screw fixedly sleeved on the outside of the core shaft; the outside of the core shaft is sleeved with a third screw located at the left end of the grinding disc structure; the conveying output structure includes a small screw fixedly sleeved on the outside of the core shaft.

[0009] Furthermore, the feeding structure also includes a feed port opened on the barrel corresponding to the feed screw, and a feed pipe fixedly installed on the outside of the barrel and connected to the feed port is fixedly installed.

[0010] Furthermore, an exhaust pipe is provided at the position of the barrel corresponding to the third screw; a connecting portion connected to the transmission assembly is provided at the right end of the main body; the barrel also includes a head located at the left end of the core shaft, a die is fixedly installed at the left end of the head, and a heating assembly is provided outside the barrel.

[0011] The beneficial effects of the present invention are: by arranging a grinding disc structure composed of a moving disc and a static disc in the cylinder, and by the mutual cooperation of the grinding grooves on the moving disc and the static disc, the material is squeezed, reversed, turbulent, stretched, etc. between the moving disc and the static disc, so that the material is mixed and stirred, and the dispersion is more uniform. In particular, the tandem disc extrusion granulator designed for nano-scale ultrafine calcium powder, powders with flaky molecular structures, and flame-retardant aramid materials can take into account the advantages of traditional internal mixers and twin-screw extruders. The material is squeezed, reversed, turbulent, and stretched between three or more sets of moving and static discs, so that the material is mixed and stirred, and the dispersion is more uniform. The water channel is designed inside the static disc, which can accurately control the granulation temperature without denaturing the material. At the same time, the overall length of the extruder is very short and the total machine power is small. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a schematic diagram of the main body cross-sectional structure; Figure 2 It is a schematic diagram of the overall structure; Figure 3 It is a schematic diagram of the static film structure; Figure 4 It is a schematic diagram of the moving piece structure.

[0013] In the figure: 1. working frame; 2. motor; 3. transmission assembly; 4. main body; 5. feed pipe; 6. feed port; 7. connecting part; 8. barrel; 9. heating assembly; 10. core shaft; 11. feeding screw; 12. first static plate; 1201, static plate grinding groove; 13. second static plate; 14. moving plate; 1401, moving plate grinding groove; 1402, spiral groove; 15. second screw; 16. third screw; 17. small screw; 18. exhaust pipe; 19. machine head; 20. die; 21. cooling water pipe. DETAILED DESCRIPTION

[0014] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0015] The directional terms mentioned in the present invention, such as "up", "down", "front", "back", "left", "right", "inside", "outside", "side", "top" and "bottom", are only for reference to the orientation of the drawings. The directional terms used are used to illustrate and understand the present invention, but not to limit the present invention.

[0016] Example: like Figure 1-Figure 4 As shown, a tandem disc extruder comprises a driving component, a transmission assembly 3 drivingly connected to the driving component, and a main body 4 drivingly connected to the transmission assembly 3; The main body 4 includes a cylinder 8, a core shaft 10 disposed transversely inside the cylinder 8, and a feeding structure, a grinding disc structure, and a conveying output structure disposed sequentially from right to left inside the cylinder 8; The grinding disc structure includes a moving piece 14 sleeved on the core shaft 10, a first static piece 12 fixed to the inner wall of the cylinder 8 and sleeved outside the moving piece 14, and a second static piece 13 fixed to the inner wall of the cylinder 8 and arranged close to the first static piece 12; A second screw 15 is fixedly sleeved on the outer side of the mandrel 10 corresponding to the second static piece 13; a gap is provided between the inner ring of the first static piece 12 and the outer ring of the moving piece 14, a gap is left between the first moving piece 14 and the side wall of the second static piece 13, and a gap is left between the second static piece 13 and the second screw 15; the inner ring diameter of the second static piece 13 is smaller than the outer ring diameter of the moving piece 14; a first static piece 12, a moving piece 14, a second static piece 13 and a second screw 15 arranged in sequence from right to left constitute a group of grinding disc assemblies, and the grinding disc structure comprises at least three groups of grinding disc assemblies arranged in sequence on the mandrel 10; the moving piece 14 corresponds to the first static piece 12, and the second static piece 13 corresponds to the second screw 15; The left and right walls of the first static plate 12 and the second static plate 13 are provided with static plate grinding grooves 1201, the left and right walls of the dynamic plate 14 are provided with dynamic plate grinding grooves 1401, and a plurality of spiral grooves 1402 are provided on the circumferential surface of the dynamic plate 14, the spiral grooves 1402 correspond to the inner circle of the first static plate 12, and the dynamic plate grinding grooves 1401 correspond to the static plate grinding grooves 1201; the sizes and depths of the static plate grinding grooves 1201 and the dynamic plate grinding grooves 1401 are different, corresponding to different abrasive requirements; the combination of the dynamic plate and the static plate, and the mutual cooperation of the static plate grinding grooves 1201 and the dynamic plate grinding grooves 1401 are relied on to achieve good mixing, stirring and dispersing effects of the materials; the left and right directions in this application are relative to Figure 1 Speaking of.

[0017] The driving component adopts a motor 2 , and the motor 2 , a transmission component 3 and a main body 4 are all installed on a working frame 1 .

[0018] The thickness of the moving piece 14 is smaller than the thickness of the first static piece 12 , and the thickness of the second screw rod 15 is larger than the thickness of the second static piece 13 .

[0019] The inner rings of the first static plate 12 and the second static plate 13 are provided with second grinding grooves in sequence along the circumferential direction; one end of the static plate grinding groove 1201 protrudes to the inner rings of the first static plate 12 and the second static plate 13, and the end is in an open shape; one end of the moving plate grinding groove 1401 protrudes to the outer ring of the moving plate 14, and the end is in an open shape. That is, the static plate grinding groove 1201 is opened from the inside of the first static plate 12 and the second static plate 13 to the outer ring direction, and the moving plate grinding groove 1401 is opened from the outer ring to the inner ring direction. The open ends of most moving plate grinding grooves 1401 are connected to the spiral groove 1402; the three side surfaces of the static plate grinding groove 1201 are all arc surfaces, which are all smoothly connected to the bottom surface; the side surface of the other end of the moving plate groove 1401 is an arc-shaped cross section, generally in a semicircular shape.

[0020] The feeding structure includes a feeding screw 11 fixedly sleeved on the outside of the core shaft 10 ; the outside of the core shaft 10 is sleeved with a third screw 16 located at the left end of the grinding disc structure; the conveying output structure includes a small screw 17 fixedly sleeved on the outside of the core shaft 10 .

[0021] The feeding structure further includes a feeding port 6 opened on the barrel 8 corresponding to the feeding screw 11 , and a feeding pipe 5 fixedly connected to the feeding port 6 is fixedly mounted on the outside of the barrel 8 .

[0022] An exhaust pipe 18 is provided at the barrel 8 corresponding to the third screw 16; a connecting portion 7 connected to the transmission assembly 3 is provided at the right end of the main body 4; the barrel 8 also includes a head 19 located at the left end of the core shaft 10, and a die 20 is fixedly installed at the left end of the head 19. A heating assembly 9 is arranged on the outside of the barrel 8, and the heating assembly 9 adopts electromagnetic induction heating; a cooling water pipe 21 is fixedly installed on the barrel 8, which is connected to the internal water channel and is used to cool the static plate by heat exchange. Common cooling means are output here, and the water channel can adopt a conventional copper pipe in contact with the static plate.

[0023] By setting a grinding disc structure composed of a moving disc and a static disc in the barrel, and by the mutual cooperation of the grinding grooves on the moving disc and the static disc, the material is squeezed, reversed, turbulent, stretched, etc. between the moving disc and the static disc, so that the material is mixed and stirred, and the dispersion is more uniform. Especially for nano-level ultrafine calcium powder, powders with flaky molecular structures, and flame-retardant aramid materials, the tandem disc extruder granulator can take into account the advantages of traditional mixers and twin-screw extruders. The material is squeezed, reversed, turbulent, and stretched between three or more sets of moving and static discs, so that the material is mixed and stirred, and the dispersion is more uniform. The water channel is designed inside the static disc, which can accurately control the granulation temperature without denaturing the material. At the same time, the overall length of the extruder is very short and the total machine power is small.

[0024] By using nano-scale ultrafine calcium powder and polyethylene for internal mixing and comparing the technical solution of the present application with that of a common twin-screw extruder, the maximum filling ratio of the tandem disc extruder of the present application can reach 87%, while the maximum filling ratio of the common twin-screw extruder is 81%.

[0025] Film blowing experiments were conducted on granules extruded by the two extruders. The stone paper blown by the granules made by the tandem disc extruder had more uniform light transmittance and no obvious patches. However, the granules made by the ordinary twin-screw extruder often had irregular patches formed by inconsistent shading rates due to uneven dispersion of calcium powder.

[0026] The above description is only used to illustrate the technical solution of the present invention rather than to limit it. Other modifications or equivalent substitutions made to the technical solution of the present invention by ordinary technicians in this field should be included in the scope of the claims of the present invention as long as they do not depart from the spirit and scope of the technical solution of the present invention.

Claims

1. A tandem disc extruder, characterized in that: It comprises a driving component, a transmission assembly (3) drivingly connected to the driving component, and a main body (4) drivingly connected to the transmission assembly (3); The main body (4) comprises a cylinder (8), a core shaft (10) arranged transversely inside the cylinder (8), and a material feeding structure, a grinding disc structure and a conveying output structure arranged in sequence from right to left inside the cylinder (8); The grinding disc structure comprises at least three groups of grinding disc assemblies arranged in sequence on the core shaft (10); the grinding disc assembly comprises a moving plate (14) sleeved on the core shaft (10), a first stationary plate (12) fixed to the inner wall of the cylinder (8) and sleeved outside the moving plate (14), a second stationary plate (13) fixed to the inner wall of the cylinder (8) and arranged close to the first stationary plate (12), and a second screw (15) sleeved outside the core shaft (10) and corresponding to the second stationary plate (13); A gap is provided between the inner ring of the first static plate (12) and the outer ring of the moving plate (14), a gap is provided between the first moving plate (14) and the side wall of the second static plate (13), and a gap is provided between the second static plate (13) and the second screw rod (15); The left and right walls of the first static plate (12) and the second static plate (13) are both provided with static plate grinding grooves (1201), the left and right walls of the dynamic plate (14) are both provided with dynamic plate grinding grooves (1401), and the circumferential surface of the dynamic plate (14) is provided with a spiral groove (1402).

2. A tandem disc extruder according to claim 1, characterized in that: The driving component is a motor (2), and the motor (2), the transmission assembly (3) and the main body (4) are all mounted on a working frame (1).

3. A tandem disc extruder according to claim 1, characterized in that: The thickness of the moving plate (14) is smaller than the thickness of the first static plate (12), and the thickness of the second screw rod (15) is larger than the thickness of the second static plate (13).

4. A tandem disc extruder according to claim 1, characterized in that: The inner circles of the first static plate (12) and the second static plate (13) are provided with second grinding grooves in sequence along the circumferential direction; one end of the static plate grinding groove (1201) protrudes into the interior of the first static plate (12) and the second static plate (13), and one end of the moving plate grinding groove (1401) protrudes into the exterior of the moving plate (14).

5. A tandem disc extruder according to claim 1, characterized in that: The material feeding structure comprises a material feeding screw (11) fixedly sleeved on the outside of the core shaft (10); a third screw (16) located at the left end of the grinding disc structure is sleeved on the outside of the core shaft (10); and the conveying output structure comprises a small screw (17) fixedly sleeved on the outside of the core shaft (10).

6. A tandem disc extruder according to claim 5, characterized in that: The feeding structure further comprises a feeding port (6) provided on the barrel (8) and corresponding to the feeding screw (11), and a feeding pipe (5) fixedly mounted on the outside of the barrel (8) and in fixed communication with the feeding port (6).

7. A tandem disc extruder according to claim 1, characterized in that: The barrel (8) is provided with an exhaust pipe (18) at a position corresponding to the third screw (16); a connecting portion (7) connected to the transmission assembly (3) is provided at the right end of the main body (4); the barrel (8) further comprises a head (19) located at the left end of the core shaft (10), a die (20) is fixedly mounted at the left end of the head (19), and a heating assembly (9) is provided outside the barrel (8).

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