A mixing device for preparing low-smoke halogen-free flame-retardant polyolefin insulation material

Abstract

The utility model discloses a kind of preparation low smoke halogen-free flame-retardant polyolefin insulating material's mixing device, including mixing tank, the top of mixing tank is equipped with feed part, the bottom of mixing tank is equipped with discharge pipe;Rotary mounting has rotating shaft in the inside middle position of mixing tank, rotating shaft is slidably installed with filter tank on it, filter tank moves up and down under the drive of transmission part, and top opening of filter tank is equipped with top plate;Rotary mounting has rotating sleeve in the bottom of filter tank, rotating sleeve is rotatably installed in the bottom of filter tank by bearing, and the circumference of rotating sleeve is equipped with stirring vane;Rotating shaft outside is equipped with sliding groove along the axis direction, and rotating sleeve's inner hole is axially installed with rib, and the rib is matched with the sliding groove;Rotating shaft is equipped with inner runner inside, and rotating shaft is equipped with liquid outlet hole being connected with inner runner, and the utility model can crush solid material and strengthen material mixing dissolution, avoid undissolved solid material with mixed material discharge, affect the preparation of polypropylene in subsequent process.

Description

Technical Field

[0001] This utility model relates to a mixing device for preparing low-smoke halogen-free flame-retardant polyolefin insulation materials, belonging to the field of polyolefin insulation material mixing technology. Background Technology

[0002] Polypropylene is a low-smoke, halogen-free, flame-retardant polyolefin insulating material. It belongs to thermoplastic polymers and is a synthetic plastic polymerized from propylene monomers. It is a common plastic material with many advantages, including lightweight, high strength, chemical stability, impact resistance, and good electrical insulation properties.

[0003] The raw materials for preparing polyolefin insulation materials include the following components: nano-polypropylene, ethylene-octene monomer, humate flame retardant, and some surface-active additives. Among these, the humate flame retardant is a liquid mixture, while the other components are solid materials such as powders or crystals. In the preparation of polyolefins, these various raw materials need to be mixed. However, the solubility of these solid materials differs. When using existing mixing devices, some incompletely dissolved particles always remain in the mixing tank, affecting the preparation effect.

[0004] In conclusion, the existing technology obviously has inconveniences and defects in practical use, so it is necessary to improve it. Utility Model Content

[0005] This invention addresses the shortcomings of the prior art by providing a mixing device for preparing low-smoke halogen-free flame-retardant polyolefin insulation materials. This device can crush solid materials and enhance material mixing and dissolution, preventing undissolved solid materials from being discharged with the mixture and affecting the preparation of polypropylene in subsequent processes.

[0006] To solve the above technical problems, the present invention adopts the following technical solution:

[0007] A mixing device for preparing low-smoke halogen-free flame-retardant polyolefin insulation material includes a mixing tank, with a feeding section at the top and a discharge pipe at the bottom.

[0008] A rotating shaft is rotatably installed in the middle of the inside of the mixing tank. A filter tank is slidably installed on the rotating shaft. The filter tank moves up and down under the drive of the transmission unit. A top plate is installed at the top opening of the filter tank.

[0009] A rotating sleeve is rotatably installed at the bottom of the filter tank. The rotating sleeve is rotatably installed at the bottom of the filter tank via a bearing. Stirring blades are installed around the circumference of the rotating sleeve. A sliding groove is provided on the outer side of the rotating shaft along the axial direction. Ribs are axially installed in the inner hole of the rotating sleeve, and the ribs cooperate with the sliding groove.

[0010] The rotating shaft has an internal flow channel and an outlet hole that communicates with the internal flow channel.

[0011] Furthermore, the liquid outlet is located at the upper end of the rotating shaft, and the inner flow channel of the rotating shaft extends only to the position close to the lower end of the liquid outlet.

[0012] Furthermore, the rib extends beyond both ends of the rotating sleeve, with the upper end of the rib extending to the top plate and the lower end of the rib extending to the bottom of the filter tank.

[0013] Furthermore, the transmission unit includes two vertically arranged lead screws, which are rotatably installed inside the mixing tank. The top plate has symmetrical extension plates on both sides, and nuts are provided on the extension plates. The nuts on the extension plates are threadedly engaged with the lead screws.

[0014] Furthermore, the transmission assembly also includes a synchronous pulley fixed to the top of the lead screw. The synchronous pulleys on the two lead screws are driven by a synchronous belt, and one of the synchronous pulleys is driven by a transmission motor (not shown in the figure).

[0015] Furthermore, an upper limit switch is provided at the upper end of the mixing tank, and a lower limit switch is provided at the lower end of the mixing tank.

[0016] Furthermore, a drive motor is installed at the bottom of the mixing tank, and the drive shaft of the drive motor is connected to the rotating shaft.

[0017] Furthermore, the feeding unit includes a feeding auger, the outlet of the lower end of the feeding auger is connected to the inner flow channel of the rotating shaft; the upper end of the feeding auger is provided with a feeding pipe and a feeding hopper, and two meshing crushing rollers are also provided between the feeding hopper and the feeding auger.

[0018] Compared with the prior art, the present invention, by adopting the above technical solution, has the following advantages:

[0019] The feed section supplies material into the inner flow channel of the rotating shaft. The mixture enters the closed filter tank from the liquid outlet. The rotating shaft drives the stirring blades to rotate, so that the undissolved solid material is continuously dissolved in the liquid material during the stirring process. The undissolved material continues to remain in the filter tank for stirring and dissolution, while the dissolved material is discharged from the mesh of the filter tank. This avoids the undissolved solid material being discharged with the mixture, which would affect the preparation of polypropylene in subsequent processes.

[0020] Solid materials are added to the feed hopper, where they are crushed by the meshing action of two crushing rollers. Liquid materials are added through the feed pipe, and the solid and liquid materials are mixed and conveyed simultaneously by the rotation of the auger, eventually entering the inner flow channel. The feed unit plays a role in crushing and enhancing mixing and dissolution.

[0021] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the structure of the filter tank and the rotating sleeve 12 in this utility model.

[0024] In the picture,

[0025] 1-Mixing tank, 2-Feeding auger, 3-Feeding hopper, 4-Crushing roller, 5-Feeding pipe, 6-Rotating shaft, 7-Sliding groove, 8-Top plate, 9-Filter tank, 10-Extension plate, 11-Screw rod, 12-Rotating sleeve, 13-Agitating blade, 14-Inner flow channel, 15-Liquid outlet, 16-Rib, 17-Upper limit switch, 18-Lower limit switch, 19-Drive motor, 20-Discharge pipe, 21-Synchronous pulley, 22-Bearing. Detailed Implementation

[0026] To provide a clearer understanding of the technical features, objectives, and effects of this utility model, the specific embodiments of this utility model are now described with reference to the accompanying drawings.

[0027] like Figure 1-2 As shown, this utility model provides a mixing device for preparing low-smoke halogen-free flame-retardant polyolefin insulation materials, including a mixing tank 1, a feeding device at the top of the mixing tank 1, and a discharge pipe 20 at the bottom of the mixing tank 1; a rotating shaft 6 is rotatably installed in the middle position inside the mixing tank 1, and a filter tank 9 is slidably installed on the rotating shaft 6. The filter tank 9 moves up and down under the drive of the transmission device, and a top plate 8 is installed at the top opening of the filter tank 9.

[0028] A rotating sleeve 12 is rotatably mounted at the bottom of the filter tank 9. The rotating sleeve 12 is rotatably mounted at the bottom of the filter tank 9 via a bearing 22. A stirring blade 13 is mounted around the circumference of the rotating sleeve 12. A sliding groove 7 is provided axially on the outer side of the rotating shaft 6. A rib 16 is axially mounted in the inner hole of the rotating sleeve 12. The rib 16 cooperates with the sliding groove 7, so that when the rotating shaft 6 rotates, it can drive the rotating sleeve 12 and the stirring blade 13 to rotate together. At the same time, when the rotating sleeve 12 slides up and down with the rotating shaft 6 along with the filter tank 9, the rib 16 slides in the sliding groove 7.

[0029] The rotating shaft 6 has an inner flow channel 14 and an outlet hole 15 connected to the inner flow channel. During the sliding process of the filter tank 9, when the outlet hole 15 is inside the filter tank 9, the feed unit supplies material to the inner flow channel 14 of the rotating shaft 6. The mixture enters the closed filter tank 9 from the outlet hole 15. The rotating shaft 6 drives the stirring blades 13 to rotate, so that the undissolved solid material is continuously dissolved in the liquid material during the stirring process. The undissolved material continues to remain in the filter tank 9 for stirring and dissolution, while the dissolved material is discharged from the mesh of the filter tank 9. In this way, the undissolved solid material is prevented from being discharged with the mixture, which would affect the preparation of polypropylene in the subsequent process.

[0030] Furthermore, the outlet hole 15 is located at the upper end of the rotating shaft 6, and the inner flow channel 14 of the rotating shaft 6 extends only to the position close to the lower end of the outlet hole 15. When feeding into the filter tank 9, the filter tank 9 moves to the upper end of the rotating shaft 6 under the drive of the transmission unit. Undissolved solid materials remain in the filter tank 9. After feeding is completed, the filter tank 9 moves down to the lower end of the rotating shaft 6, immersing the filter tank 9 in the mixture. At this time, the rotating shaft 6 drives the stirring blades 13 to rotate, causing the solid materials to continuously dissolve and be discharged from the filter tank 9. Setting the outlet hole 15 at the upper end of the rotating shaft 6 makes the inner flow channel 14 shorter and also avoids material accumulation in the inner flow channel 14.

[0031] The rib 16 extends beyond both ends of the rotating sleeve 12, with its upper end extending to the top plate 8 and its lower end extending to the bottom of the filter tank 9. The two ends of the rib 16 seal the sliding groove 7 at the top plate 8 and the filter tank 9 to prevent leakage.

[0032] The transmission unit includes two vertically arranged lead screws 11, which are rotatably installed inside the mixing tank 1. The top plate 8 has symmetrical extension plates 10 on both sides, and nuts are provided on the extension plates 10. The nuts on the extension plates 10 are threadedly engaged with the lead screws 11.

[0033] The transmission assembly also includes a synchronous pulley 21 fixed to the top of the lead screw 11. The synchronous pulleys 21 on the two lead screws 11 are driven by a synchronous belt, and one of the synchronous pulleys 21 is driven by a transmission motor (not shown in the figure).

[0034] An upper limit switch 17 is provided at the upper end of the mixing tank 1, and a lower limit switch 18 is provided at the lower end of the mixing tank 1. When the top plate 8 touches the upper limit switch 17 or the filter tank 9 touches the lower limit switch 18, the drive motor stops running, thereby controlling the filter tank 9 to stop moving up or down.

[0035] The bottom of the mixing tank 1 is equipped with a drive motor 19, and the drive shaft of the drive motor 19 is connected to the rotating shaft 6.

[0036] The feeding unit includes a feeding auger 2, the lower end of which is connected to the inner flow channel 14 of the rotating shaft 6. The upper end of the feeding auger 2 is provided with a feeding pipe 5 and a feeding hopper 3. Two meshing crushing rollers 4 are also provided between the feeding hopper 3 and the feeding auger 2. Solid materials are added to the feeding hopper 3, where they are crushed by the meshing action of the two crushing rollers 4. Liquid materials are added through the feeding pipe 5, and under the rotation of the auger, the solid and liquid materials are mixed and conveyed simultaneously, ultimately entering the inner flow channel 14. The feeding unit serves to crush and enhance mixing and dissolution.

[0037] The above description provides examples of the preferred embodiments of this utility model. Any aspects not detailed herein are common knowledge to those skilled in the art. The scope of protection of this utility model is determined by the claims. Any equivalent modifications based on the technical teachings of this utility model are also within the scope of protection of this utility model.

Claims

1. A mixing apparatus for preparing low-smoke halogen-free flame-retardant polyolefin insulating materials, characterized in that: It includes a mixing tank (1), the top of the mixing tank (1) is provided with a feeding part, and the bottom of the mixing tank (1) is provided with a discharge pipe (20); A rotating shaft (6) is rotatably installed in the middle of the mixing tank (1). A filter tank (9) is slidably installed on the rotating shaft (6). The filter tank (9) moves up and down under the drive of the transmission unit. A top plate (8) is installed at the top opening of the filter tank (9). A rotating sleeve (12) is rotatably installed at the bottom of the filter tank (9). The rotating sleeve (12) is rotatably installed at the bottom of the filter tank (9) via a bearing (22). A stirring blade (13) is installed around the circumference of the rotating sleeve (12). A sliding groove (7) is provided on the outer side of the rotating shaft (6) along the axial direction. A rib (16) is axially installed in the inner hole of the rotating sleeve (12). The rib (16) cooperates with the sliding groove (7). The rotating shaft (6) is provided with an inner flow channel (14) and an outlet hole (15) connected to the inner flow channel.

2. The mixing apparatus for preparing low-smoke halogen-free flame-retardant polyolefin insulating materials as described in claim 1, characterized in that: The liquid outlet (15) is located at the upper end of the rotating shaft (6), and the inner flow channel (14) of the rotating shaft (6) extends only to the position close to the lower end of the liquid outlet (15).

3. The mixing apparatus for preparing low-smoke halogen-free flame-retardant polyolefin insulating materials as described in claim 1, characterized in that: The rib (16) extends beyond both ends of the rotating sleeve (12), with the upper end of the rib (16) extending to the top plate (8) and the lower end of the rib (16) extending to the bottom of the filter tank (9).

4. The mixing apparatus for preparing low-smoke halogen-free flame-retardant polyolefin insulating materials as described in claim 1, characterized in that: The transmission unit includes two vertically arranged lead screws (11), which are rotatably installed inside the mixing tank (1). The top plate (8) is symmetrically provided with extension plates (10) on both sides, and nuts are provided on the extension plates (10). The nuts on the extension plates (10) are threadedly engaged with the lead screws (11).

5. The mixing apparatus for preparing low-smoke halogen-free flame-retardant polyolefin insulating materials as described in claim 4, characterized in that: The transmission assembly also includes a synchronous pulley (21) fixed to the top of the lead screw (11). The synchronous pulleys (21) on the two lead screws (11) are driven by a synchronous belt, and one of the synchronous pulleys (21) is driven by a transmission motor.

6. The mixing apparatus for preparing low-smoke halogen-free flame-retardant polyolefin insulating materials as described in claim 1, characterized in that: The mixing tank (1) is equipped with an upper limit switch (17) at the upper end and a lower limit switch (18) at the lower end.

7. The mixing apparatus for preparing low-smoke halogen-free flame-retardant polyolefin insulating materials as described in claim 1, characterized in that: A drive motor (19) is provided at the bottom of the mixing tank (1), and the drive shaft of the drive motor (19) is connected to the rotating shaft (6).

8. The mixing apparatus for preparing low-smoke halogen-free flame-retardant polyolefin insulating materials as described in claim 1, characterized in that: The feeding unit includes a feeding auger (2), the outlet of the lower end of the feeding auger (2) is connected to the inner flow channel (14) of the rotating shaft (6); the upper end of the feeding auger (2) is provided with a feeding pipe (5) and a feeding hopper (3), and two intermeshing crushing rollers (4) are also provided between the feeding hopper (3) and the feeding auger (2).

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