A preparation device for modified PBT material

Abstract

The present invention relates to the field of PBT material modification, and in particular to a preparation device for modified PBT material, comprising a shell with a leak at the bottom, a partition fixed to the top surface of the interior of the shell, a shaft barrel sleeved on the exterior of the partition, a first material chamber, a second material chamber, and a third material chamber formed between the edge of the partition and the inner wall of the shaft barrel, the first material chamber and the second material chamber being respectively connected to two groups of storage bins via auger conveyors, and multiple groups of mixing components being connected downwardly at equal angles around the edge of the shaft barrel, the mixing components passing through the interior of the shaft barrel, and the shaft barrel being connected to a servo motor for driving the same to rotate. The present invention adopts four groups of mixing components to sequentially and continuously introduce a fixed amount of PBT base material and chopped glass fiber material, thereby reducing the amount of material mixed in a single batch, so that the PBT base material and the chopped glass fiber material are highly evenly mixed before being co-extruded, thereby avoiding abnormal floating fibers on the surface of the PBT material, and the four groups of mixing components continuously feed, mix, and discharge materials, which can match the uninterrupted feeding of the screw extruder.

Description

Technical Field

[0001] The present invention relates to the field of PBT material modification, and in particular to a preparation device for modified PBT material. Background Art

[0002] PBT material has the advantages of high heat resistance, toughness, fatigue resistance, self-lubrication, low friction coefficient, weather resistance, low water absorption, etc. It is widely used in automobiles, electronic appliances, industrial machinery and other industries. The basic PBT material has high notch sensitivity and needs to be modified. It is common to modify PBT material with glass fiber. Adding glass fiber to PBT can not only maintain the original advantages of PBT resin such as chemical resistance and processability, but also significantly improve its mechanical properties and overcome the notch sensitivity of PBT resin.

[0003] When using glass fiber to modify PBT material, a mixer is traditionally used to mix the PBT base material and chopped glass fiber in proportion at one time, and then the mixture is fed into a screw extruder to extrude the material. However, chopped glass fiber is lighter, and it is difficult to ensure mixing uniformity by mixing the PBT base material and chopped glass fiber in large quantities at one time. This can easily lead to abnormal floating fibers on the surface of the PBT material, reducing the quality of the modified material. Summary of the Invention

[0004] The purpose of the present invention is to solve the following problems existing in the prior art: conventionally, a mixer is used to mix the PBT substrate and chopped glass fibers in proportion at one time, and then the mixture is fed into a screw extruder to extrude the material. However, chopped glass fibers are relatively light, and it is difficult to ensure mixing uniformity when mixing the PBT substrate and chopped glass fibers in large quantities at one time, which easily leads to abnormal floating fibers on the surface of the PBT material, thereby reducing the quality of the modified material.

[0005] In order to solve the problems existing in the prior art, the present invention provides a preparation device for modified PBT material, comprising a shell with a leak at the bottom, a partition frame fixed to the top surface of the interior of the shell, a shaft cylinder sleeved on the outside of the partition frame, a first material chamber, a second material chamber, and a third material chamber formed between the edge of the partition frame and the inner wall of the shaft cylinder, the first material chamber and the second material chamber are respectively connected to two groups of storage bins through auger conveyors, and multiple groups of mixing components are connected at equal angles downward around the edge of the shaft cylinder, the mixing components pass through the interior of the shaft cylinder, and the shaft cylinder is connected to a servo motor that drives it to rotate, which is used to continuously convert the mixing components to pass through the first material chamber, the second material chamber, and the third material chamber.

[0006] Preferably, the mixing assembly includes a cylindrical shell and a bottom cover covering the bottom of the cylindrical shell. A handle tube is rotated through the top surface of the cylindrical shell, and both ends of the handle tube are connected. The surface of the shaft cylinder has an extension tube, and the handle tube and the extension tube are rotated and connected in a straight line.

[0007] Preferably, the handle tube and the extension tube are inclined downward at an angle of 30-60°.

[0008] Preferably, the mixing assembly further comprises a stirring handle, which is placed inside the cylindrical shell and fixedly connected to the handle tube. A gear ring is provided inside the shell, which is concentrically distributed with the shaft cylinder, and the handle tube is meshed with the gear ring through a gear member.

[0009] Preferably, a rotating handle is fixed to the inclined top of the bottom cover, and the rotating handle is elastically rotatably connected to the cylinder shell through a torsion spring. A top block aligned with the rotating handle is fixed to the inner wall of the shell, and the top block radially aligns with the third material cavity.

[0010] Preferably, an air pump is provided on the top of the shell, and the exhaust end of the air pump is connected to the third material chamber.

[0011] Preferably, a material port is provided near the bottom of the handle tube, and a filter is provided on the top surface of the cylindrical shell.

[0012] Compared with the related art, the preparation device of the modified PBT material provided by the present invention has the following beneficial effects:

[0013] 1. The present invention adopts four groups of mixing components to continuously introduce a fixed amount of PBT base material and short glass fiber material in sequence, reducing the amount of single material mixing, so that the PBT base material and short glass fiber material are highly evenly mixed before blending and extrusion, avoiding abnormal floating fibers on the surface of the PBT material. In addition, the four groups of mixing components continuously feed, mix and discharge materials, which can match the uninterrupted feeding of the screw extruder;

[0014] 2. The present invention arranges four mixing components in a circular transposition manner around the first, second and third material chambers. By tilting the mixing components, the first and second material chambers automatically feed the materials to the mixing components, thus realizing the function of automatic continuous feeding.

[0015] 3. During the rotation and transposition process of the four mixing components, the present invention causes the handle tube to drive the stirring handle to rotate synchronously through the engagement of the gear ring and the gear member, thereby mixing the PBT base material and the chopped glass fiber material. This eliminates the need for independent drive equipment and ensures a coordinated mixing effect.

[0016] 4. The present invention adopts an air pump to continuously supply air to the third material chamber. The gas is dispersed and introduced into the cylinder shell through the handle tube to assist the stirring handle in mixing the materials and accelerate the mixing efficiency. The introduction of gas is also beneficial to assist discharge when the bottom cover is opened, speeding up the discharge of the mixed material and avoiding residue. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0018] Figure 2 Schematic diagram of the internal structure of the housing of the present invention;

[0019] Figure 3 This is a schematic diagram of the structure of the handle tube connected to the shaft cylinder of the present invention;

[0020] Figure 4 This is a schematic diagram of the distribution structure of the first material cavity, the second material cavity, and the third material cavity of the present invention;

[0021] Figure 5 Schematic diagram of the distribution structure of the mixing components of the present invention;

[0022] Figure 6 Schematic diagram of the structure of the mixing assembly of the present invention.

[0023] Numbers in the figure: 1. Shell; 11. Storage bin; 12. Air pump; 13. Servo motor; 2. Cylinder shell; 21. Bottom cover; 22. Filter; 3. Shaft cylinder; 31. Shaft rod; 32. Extension tube; 4. Gear ring; 5. Top block; 6. Partition; 61. First material chamber; 62. Second material chamber; 63. Third material chamber; 7. Turning handle; 8. Handle tube; 81. Material port; 82. Agitator handle; 9. Gear parts. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0025] The specific implementation of the present invention is described in detail below with reference to specific embodiments.

[0026] Example 1

[0027] like Figure 1-4 As shown, a preparation device for a modified PBT material includes a housing 1. The bottom of the housing 1 is funnel-shaped and has a leak opening at the funnel portion. A partition 6 is fixedly installed at the center of the top surface inside the housing 1. The shaft cylinder 3 is rotatably sleeved on the outside of the partition 6. The partition 6 has two fins, through which a first material cavity 61, a second material cavity 62, and a third material cavity 63 are formed between the edge of the partition 6 and the inner wall of the shaft cylinder 3. The bottom of the partition 6 is frustum-shaped, so that the bottoms of the first material cavity 61, the second material cavity 62, and the third material cavity 63 are inclined surfaces. Four extension tubes 32 are distributed at equal angles on the outer surface of the shaft cylinder 3. The extension tubes 32 pass through the interior of the shaft cylinder 3, and the outer ends of the extension tubes 32 are tilted downward by 30-60 degrees.

[0028] like Figure 1 As shown, the shaft 31 rotates and passes through the center of the top surface of the housing 1. The bottom of the shaft 31 is fixedly connected to the shaft cylinder 3. The servo motor 13 is installed on the top of the housing 1. The output shaft of the servo motor 13 is connected to the top of the shaft 31 through a chain or gear assembly.

[0029] Two storage bins 11 are placed above the housing 1, and are used to store PBT base material and chopped glass fiber material respectively. The bottom of each storage bin 11 is connected to an auger conveyor. The auger conveyor has a circular tube shell, an auger component is arranged inside, and a motor connected to the auger component is arranged on the top. The bottom of the auger conveyor passes through the top surface of the housing 1 and is connected to the first material cavity 61 and the second material cavity 62 respectively. The PBT base material and chopped glass fiber material in the storage bin 11 are respectively introduced into the first material cavity 61 and the second material cavity 62 at a uniform speed through the auger conveyor;

[0030] like Figure 5 As shown, four groups of mixing components are distributed around the shaft cylinder 3 in the housing 1;

[0031] like Figure 6 As shown, the mixing assembly includes a cylinder shell 2, which has a cylindrical inner cavity. The center position of the top surface of the cylinder shell 2 rotates to penetrate the handle tube 8, and the two ends of the handle tube 8 are connected. The handle tube 8 rotates linearly to connect to the extension tube 32, so that the cylinder shell 2 forms an inclined shape, and the cylinder shell 2 is fixedly connected to the shaft cylinder 3 by a rod. A bottom cover 21 is provided at the bottom of the cylinder shell 2, and a rotating handle 7 is fixed to the inclined top of the bottom cover 21. The rotating handle 7 is rotatably connected to the cylinder shell 2, and a torsion spring is used to connect the rotating handle 7 and the cylinder shell 2, so that the bottom cover 21 is elastically closed to block the bottom of the cylinder shell 2 in a normal state. A plurality of stirring handles 82 are evenly fixed at the inner end of the handle tube 8 located in the cylinder shell 2;

[0032] like Figure 2-3 As shown, the gear member 9 includes a gear 1 fixed to the outer wall of the handle tube 8, a gear 2 rotating on the top of the cylindrical shell 2, the gear 1 is meshed with the gear 2, the gear 2 is coaxially fixed with the bevel gear, the gear ring 4 is concentrically distributed with the shaft cylinder 3, and the gear ring 4 is fixedly connected to the shell 1, and the bevel gear is meshed with the gear ring 4;

[0033] like Figure 2 As shown, an arc-shaped raised top block 5 is fixed on the inner wall of the housing 1 , the top block 5 is aligned with the handle 7 in height, and the top block 5 is aligned with the third material cavity 63 in radial direction;

[0034] The leakage port of the shell 1 is aligned with the feed port of the screw extruder. The two storage bins 11 store PBT base material and chopped glass fiber material respectively. The servo motor 13 is turned on to drive the shaft 31 and the shaft cylinder 3 to rotate in the gap, so that the four extension tubes 32 are intermittently shifted and aligned with the first material cavity 61, the second material cavity 62, and the third material cavity 63 in turn. When the extension tube 32 is aligned with the first material cavity 61, the PBT base material is fed into the first material cavity 61 through the auger conveyor, and enters the cylinder shell 2 through the extension tube 32 and the handle tube 8. Then the extension tube 32 is shifted and aligned with the second material cavity 62, and the auger conveyor is used to transfer the PBT base material to the first material cavity 61. The chopped glass fiber material is fed into the second material chamber 62 and enters the cylinder shell 2 through the extension tube 32 and the handle tube 8. During the repositioning process of the cylinder shell 2, the gear member 9 engages with the gear ring 4, driving the handle tube 8 to rotate the stirring handle 82, thereby mixing and stirring the materials in the cylinder shell 2. The third material chamber 63 occupies two pause positions. When the cylinder shell 2 is repositioned and moves to the position where the third material chamber 63 is close to the first material chamber 61, the top block 5 presses and contacts the rotating handle 7, causing the bottom cover 21 to overcome the elastic force and rotate. The bottom of the cylinder shell 2 opens to leak the material, and the mixed material is introduced into the feed port of the screw extruder through the leakage port of the shell 1.

[0035] Each time the two groups of auger conveyors feed the materials into the first material chamber 61 and the second material chamber 62, they maintain a uniform feeding speed and a constant feeding time to ensure that the feeding amount is the same each time;

[0036] Example 2

[0037] like Figure 1 、 6 As shown, an air pump 12 is provided on the top of the shell 1, and the exhaust end of the air pump 12 is connected to the third material chamber 63 through a pipeline. A plurality of material ports 81 are provided near the bottom of the handle tube 8, and a filter screen 22 is provided on the top surface of the cylinder shell 2;

[0038] The air pump 12 continuously supplies air to the third material chamber 63. When the cylindrical shell 2 with the PBT base material and the chopped glass fiber material is displaced and passes through the third material chamber 63, the air is sprayed into the cylindrical shell 2 through the bottom opening of the handle tube 8 and the material opening 81, thereby inflating the interior of the material and cooperating with the stirring handle 82 to accelerate the mixing of the material. In addition, the air flow also causes all the residual material in the handle tube 8 to be introduced into the cylindrical shell 2. The filter screen 22 at the top of the cylindrical shell 2 is used to balance the air pressure in the cylindrical shell 2.

[0039] The airflow introduced into the cylindrical shell 2 by the handle tube 8 is beneficial to assisting the discharge of materials when the bottom cover 21 is opened, accelerating the discharge of the mixed material and avoiding residue.

Claims

1. A device for preparing a modified PBT material, comprising a housing (1) having a leak at the bottom, characterized in that: A partition (6) is fixed to the top surface of the inner part of the shell (1), and a shaft cylinder (3) is sleeved on the outer part of the partition (6). A first material cavity (61), a second material cavity (62), and a third material cavity (63) are formed between the edge of the partition (6) and the inner wall of the shaft cylinder (3). The first material cavity (61) and the second material cavity (62) are respectively connected to two groups of storage bins (11) through auger conveyors. Multiple groups of mixing components are connected at equal angles downward around the edge of the shaft cylinder (3). The mixing components pass through the interior of the shaft cylinder (3). The shaft cylinder (3) is connected to a servo motor (13) that drives it to rotate, and is used to continuously switch the mixing components and the first material cavity (61), the second material cavity (62), and the third material cavity (63). The mixing assembly comprises a cylindrical shell (2) and a bottom cover (21) covering the bottom of the cylindrical shell (2); a handle tube (8) is rotatably passed through the top surface of the cylindrical shell (2); both ends of the handle tube (8) are connected; an extension tube (32) is provided on the surface of the shaft cylinder (3); the handle tube (8) and the extension tube (32) are rotatably connected; The mixing assembly further comprises a stirring handle (82), which is placed inside the cylindrical shell (2) and fixedly connected to the handle tube (8); a gear ring (4) is provided inside the shell (1), the gear ring (4) is concentrically distributed with the shaft cylinder (3), and the handle tube (8) is meshed with the gear ring (4) via a gear member (9); A rotating handle (7) is fixed to the inclined top of the bottom cover (21), and the rotating handle (7) is elastically rotatably connected to the cylindrical shell (2) via a torsion spring. A top block (5) aligned with the rotating handle (7) is fixed to the inner wall of the shell (1), and the top block (5) is radially aligned with the third material cavity (63); The servo motor (13) is turned on to drive the shaft (31) and the shaft cylinder (3) to rotate in a gap, so that the four extension tubes (32) are intermittently shifted in sequence to align with the first material cavity (61), the second material cavity (62), and the third material cavity (63). When the extension tube (32) is aligned with the first material cavity (61), the PBT base material is fed into the first material cavity (61) through the auger conveyor, and enters the cylinder shell (2) through the extension tube (32) and the handle tube (8). Then the extension tube (32) is shifted to align with the second material cavity (62), and the short-cut glass fiber material is fed into the second material cavity (62) through the auger conveyor, and the short-cut glass fiber material is fed into the second material cavity (62) through the extension tube. (32), the handle tube (8) enters the barrel shell (2), and during the barrel shell (2) displacement process, the gear member (9) engages with the gear ring (4), driving the handle tube (8) to drive the stirring handle (82) to rotate, mixing and stirring the materials in the barrel shell (2). The third material chamber (63) occupies two pause positions. When the barrel shell (2) is displaced and moves to the position where the third material chamber (63) is close to the first material chamber (61), the top block (5) presses and contacts the rotating handle (7), causing the bottom cover (21) to overcome the elastic force and rotate, and the bottom of the barrel shell (2) opens to leak the material, and the mixed material is introduced into the feed port of the screw extruder through the leakage port of the shell (1).

2. The preparation device of the modified PBT material according to claim 1, characterized in that, The handle tube (8) and the extension tube (32) are inclined downward at an angle of 30-60°.

3. The preparation device of the modified PBT material according to claim 1, characterized in that, An air pump (12) is provided on the top of the housing (1), and an exhaust end of the air pump (12) is connected to the third material chamber (63).

4. The preparation device of the modified PBT material according to claim 3, characterized in that, A material opening (81) is provided near the bottom of the handle tube (8), and a filter screen (22) is provided on the top surface of the cylindrical shell (2).

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