Raw material mixing device for polyformaldehyde production

Abstract

The utility model relates to a chemical industry technical field especially, a raw material mixing equipment for polyformaldehyde production, to the problem that the mixing device in the prior art cannot conveniently and timely stir the material at different depths, the present scheme is proposed, it includes mixing jar, the bottom of one side of mixing jar is installed with discharge pipe, its characterized in that, the inside installation of mixing jar has the stirring mechanism for mixing material and the material scraping mechanism for scraping the material on the lateral wall of mixing jar, the stirring mechanism includes the pivot that rotates and connects in the inner wall of mixing jar top and the telescopic stirring paddle that is fixed in the pivot bottom, the material scraping mechanism includes the scraper that is located in the inside of mixing jar and is fixed with the stirring paddle, the utility model not only can conveniently and labor-savingly stir the material at different depths evenly, but also can discharge the air mixed in the raw material by manufacturing the negative pressure in the mixing jar while stirring, thereby greatly reduce the bubble rate in the raw material.

Description

Technical Field

[0001] This utility model relates to the chemical industry, and in particular to a raw material mixing device for the production of polyoxymethylene. Background Technology

[0002] Polyoxymethylene (POM), a high-performance thermoplastic engineering plastic, is known as "super steel" or "acetal" and is widely used in machinery, automotive, and electronics industries. Its production process requires the uniform mixing of POM base material with antioxidants, heat stabilizers, and modifying additives (such as polylactic acid and vinyl copolymers) to ensure the mechanical strength, heat resistance, and dimensional stability of the final product.

[0003] Currently, the mixing of polyoxymethylene (POM) raw materials mainly relies on mechanical mixing equipment. Traditional mechanical mixing equipment mostly uses single-axial stirring blades, which can only stir a material layer at a fixed depth. The lower layer of material is difficult to lift due to gravity, while the upper layer of material is easy to float, resulting in significant differences in the flowability of materials at different depths in the mixing tank, forming a mixing blind zone. To address this, this solution proposes a raw material mixing equipment for POM production. Utility Model Content

[0004] The present invention proposes a raw material mixing device for polyoxymethylene production, which solves the problem that existing mixing devices cannot conveniently and timely stir materials at different depths.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A raw material mixing device for polyoxymethylene production includes a mixing tank, a discharge pipe installed at the bottom of one side of the mixing tank, and a stirring mechanism for mixing materials and a scraping mechanism for scraping materials off the side wall of the mixing tank installed inside the mixing tank.

[0007] The stirring mechanism includes a rotating shaft rotatably connected to the inner wall of the top of the mixing tank and a retractable stirring paddle fixed to the bottom of the rotating shaft.

[0008] The scraping mechanism includes a scraper located inside the mixing tank and fixedly connected to the agitator, and a linkage component installed inside the mixing tank for driving the scraper and the agitator to move up and down reciprocally when the agitator rotates.

[0009] It also includes a negative pressure mechanism installed on the top surface of the mixing tank drive. The negative pressure mechanism is connected to the linkage component and discharges the air inside the mixing tank to the outside when it is running. A pressure stabilizing pipe connected to the inside is installed on the top of the outer periphery of the mixing tank. A pressure valve is installed on the pressure stabilizing pipe so that when the pressure inside the mixing tank is less than a set value, the outside air can enter the mixing tank through the pressure stabilizing pipe.

[0010] The above technical solution not only allows for convenient and labor-saving uniform mixing of materials at different depths, but also enables the removal of air mixed in with the raw materials by creating negative pressure in the mixing tank during mixing, thereby greatly reducing the bubble rate in the raw materials and contributing to the improvement of product quality.

[0011] As a further improvement to the above solution, the top of the mixing tank is provided with a feed inlet, and the top surface of the mixing pipe is hinged to a top cover for sealing the feed inlet. The side of the top cover away from the hinge is fixed to the top of the mixing tank by a latch.

[0012] The above technical solution uses a top cover to seal the feed inlet, thereby isolating the inside of the mixing tank.

[0013] As a further improvement to the above solution, the stirring paddle includes a fixed rod fixed to the bottom of the rotating shaft, a movable tube movably sleeved on the outer periphery of the fixed rod, and multiple stirring rods fixed on the outer periphery of the movable tube. The fixed rod has a regular polygonal prism structure, and the inner ring of the movable tube matches the outer periphery of the fixed rod.

[0014] The above technical solution enables the movable tube to not only rotate synchronously with the fixed rod, but also to move up and down along the axial direction of the fixed rod.

[0015] As a further improvement to the above solution, the linkage component includes a connecting ring movably sleeved on the outer periphery of the rotating shaft and a guide member installed on the rotating shaft for driving the connecting ring to move up and down reciprocally when it rotates. The outer periphery of the connecting ring is fixed to the scraper through a connecting rod.

[0016] The above technical solution enables the scraper to rotate and move synchronously with the stirring paddle.

[0017] As a further improvement to the above solution, the guide component includes a guide shaft sleeved on the outer circumference of the rotating shaft, a mounting ring movably sleeved on the outer circumference of the guide shaft, and a slide rod fixed on the inner ring of the mounting ring. The connecting ring is rotatably sleeved on the outer ring of the mounting ring. A guide groove is provided on the outer circumference of the guide shaft, which is coaxial with and inclined to the guide shaft. One end of the slide rod extends into the guide groove and slides therewith.

[0018] With the above technical solution, while the guide shaft rotates, the slide rod slides inside the slide groove, thereby driving the slide rod to move up and down along the axial direction of the guide shaft while sliding inside the slide groove, thus achieving the purpose of conveniently driving the stirring paddle to move up and down reciprocally while rotating.

[0019] As a further improvement to the above solution, the negative pressure mechanism is provided in multiple sets. The negative pressure mechanism includes an air cylinder installed on the top surface of the mixing tank, a piston plate installed inside the air cylinder, and a piston rod fixed to the bottom surface of the piston plate. The bottom of the air cylinder extends into the interior of the mixing tank, and the bottom of the piston rod is fixedly connected to the top surface of the mounting ring. An exhaust pipe and an intake pipe communicating with the interior of the mixing tank are installed on the top of the air cylinder. A one-way valve is installed on both the exhaust pipe and the intake pipe.

[0020] The above technical solution utilizes the up-and-down movement of the mounting ring to drive the piston rod to move synchronously, thereby using an air cylinder to extract air from the mixing tank, achieving the purpose of creating negative pressure in the mixing tank 1.

[0021] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0022] 1. Through the cooperation between the stirring mechanism and the scraping mechanism, while the rotating shaft drives the stirring paddle and scraper to rotate, the linkage component drives the stirring paddle to move up and down. This not only scrapes off the raw materials adhering to the inner wall of the mixing tank, but also mixes the raw materials inside the mixing tank more evenly during the reciprocating movement of the stirring paddle.

[0023] 2. Through the coordinated operation of the negative pressure component and the linkage component, air is continuously extracted from the mixing tank while the materials are being mixed, thereby creating a negative pressure environment inside the mixing tank. This helps to break up air bubbles in the raw materials and prevents excessive air from being mixed into the raw materials due to agitation. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of this utility model;

[0025] Figure 2 This is a cross-sectional view of the mixing tank;

[0026] Figure 3 This is a schematic diagram of the stirring device.

[0027] Figure 4 This is a structural schematic diagram of the connecting ring and guide shaft;

[0028] Figure 5 This is a schematic diagram of the telescopic rod.

[0029] Explanation of key symbols:

[0030] 1. Mixing tank; 2. Discharge pipe; 3. Top cover; 4. Stirring motor; 5. Air cylinder; 6. Suction pipe; 7. Pressure stabilizing pipe; 8. Feed inlet; 9. Exhaust pipe; 10. Connecting ring; 11. Guide shaft; 12. Fixed rod; 13. Movable pipe; 14. Stirring rod; 15. Scraper; 16. Mounting ring; 17. Rotating shaft; 18. Guide groove; 19. Slide rod; 20. Piston rod. Detailed Implementation

[0031] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, without conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0032] Example 1:

[0033] Please combine Figures 1-5 This embodiment of a raw material mixing device for polyoxymethylene production includes a mixing tank 1. A discharge pipe 2 is installed at the bottom of one side of the mixing tank 1. A valve is installed on the discharge pipe 2. When the valve is opened, the material in the mixing tank 1 can be discharged from the discharge pipe 2.

[0034] The mixing tank 1 is equipped with a stirring mechanism for mixing materials and a scraping mechanism for scraping off the material on the side wall of the mixing tank 1. The stirring mechanism stirs and mixes the raw materials in the mixing tank 1, while the scraping mechanism scrapes off the material attached to the side wall of the mixing tank 1 so that it is incorporated into the mixing of the raw materials, ensuring that the raw materials are mixed more evenly and avoiding excessive material residue in the mixing tank 1 when discharging.

[0035] The stirring mechanism includes a rotating shaft 17 rotatably connected to the inner wall of the top of the mixing tank 1 and a retractable stirring paddle fixed to the bottom of the rotating shaft 17. The stirring paddle includes a fixed rod 12 fixed to the bottom of the rotating shaft 17, a movable tube 13 movably sleeved on the outer periphery of the fixed rod 12, and multiple stirring rods 14 fixed on the outer periphery of the movable tube 13. The fixed rod 12 has a regular polygonal prism structure, and the inner ring of the movable tube 13 matches the outer periphery of the fixed rod 12. A stirring motor 4 for driving the rotating shaft 17 to rotate is installed on the top surface of the mixing tank 1. One end of the output shaft of the stirring motor 4 is connected to the top of the rotating shaft 17. When mixing materials, the stirring motor 4 is started. After the stirring motor 4 rotates, it drives the rotating shaft 17 to rotate. After the rotating shaft 17 rotates, it drives the fixed rod 12 to rotate. After the regular polygonal prism structure of the fixed rod 12 rotates, it drives the movable tube 13 to rotate synchronously, thereby causing the stirring rods 14 to rotate, which in turn can stir and mix the materials in the mixing tank 1.

[0036] The scraping mechanism includes a scraper 15 disposed inside the mixing tank 1 and fixedly connected to the stirring paddle, and a linkage component installed inside the mixing tank 1 for driving the scraper 15 to move up and down reciprocally with the stirring paddle when the stirring paddle rotates. The linkage component includes a connecting ring 10 movably sleeved on the outer periphery of the rotating shaft 17 and a guide member installed on the rotating shaft 17 for driving the connecting ring 10 to move up and down reciprocally when it rotates. The outer periphery of the connecting ring 10 is fixedly connected to the scraper 15 through a connecting rod. The scraper 15 is arranged along the axial direction of the mixing tank 1, and one long side of the scraper 15 abuts against the inner wall of the mixing tank 1. When the stirring paddle rotates, it drives the scraper 15 to rotate at the same time, thereby scraping off the material adhering to the inner wall of the mixing tank 1.

[0037] The guide component includes a guide shaft 11 sleeved around the outer periphery of the rotating shaft 17, a mounting ring 16 movably sleeved around the outer periphery of the guide shaft 11, and a sliding rod 19 fixed to the inner ring of the mounting ring 16. A connecting ring 10 is rotatably sleeved around the outer ring of the mounting ring 16. A guide groove 18, coaxial with and inclined to the guide shaft 11, is opened on the outer periphery of the guide shaft 11. One end of the sliding rod 19 extends into the guide groove 18 and slides into it. With this simple structure, the guide component can drive the guide shaft 11 to rotate while the rotating shaft rotates. After the guide shaft 11 rotates, the sliding rod 19 moves up and down along the axial direction of the guide shaft 11 during the sliding process in the guide groove 18, thereby driving the mounting ring 16 to move up and down. While the mounting ring 16 moves up and down, it drives the connecting ring 10 to move up and down synchronously. The connecting ring 10 then drives the scraper 15 and the stirring paddle to move up and down synchronously, so that the stirring rod 14 mixes the material inside the mixing tank 1 more evenly during the up and down reciprocating movement.

[0038] In this embodiment, the top of the mixing tank 1 is provided with a feed inlet 8. The top surface of the mixing tank 1 is hinged with a top cover 3 for sealing the feed inlet 8. The side of the top cover 3 away from the hinge is fixed to the top of the mixing tank 1 by a latch. The feed inlet 8 is used for raw materials to enter the mixing tank 1, while the top cover 3 is provided to seal the feed inlet 8, thereby isolating the mixing tank 1 from the outside world.

[0039] Example 2:

[0040] Combination Figure 1 Figure 4 This embodiment, based on embodiment 1, further improves upon the following: it also includes a negative pressure mechanism installed on the top surface of the mixing tank transmission 1. The negative pressure mechanism is connected to the linkage component and, during its operation, discharges the air inside the mixing tank 1 to the outside. A pressure stabilizing pipe 7, communicating with the inside of the mixing tank 1, is installed on the top of the outer periphery of the mixing tank 1. A pressure valve is installed on the pressure stabilizing pipe 7 to allow outside air to enter the mixing tank 1 through the pressure stabilizing pipe 7 when the pressure inside the mixing tank 1 is less than a set value. As the negative pressure mechanism draws the air out of the mixing tank 1, the pressure inside the mixing tank 1 gradually decreases, thereby causing the air bubbles in the raw materials caused by the air mixed in during stirring to burst. The air contained in the raw materials is discharged, thus significantly reducing the bubble rate in the raw materials. This avoids the presence of air bubbles in the produced fibers, which would affect product quality. The pressure valve automatically opens under the action of the pressure difference when the pressure inside the mixing tank 1 is less than the maximum value of the pressure valve, allowing outside air to enter the mixing tank 1. This balances the pressure inside and outside the mixing tank 1, preventing the negative pressure mechanism from stopping due to excessively low pressure inside the mixing tank 1, and also preventing any impact on the normal operation of the stirring mechanism.

[0041] In this embodiment, multiple sets of negative pressure mechanisms are provided. Each negative pressure mechanism includes an air cylinder 5 installed on the top surface of the mixing tank 1, a piston plate installed inside the air cylinder 5, and a piston rod 20 fixed to the bottom surface of the piston plate. The bottom of the air cylinder 5 extends into the mixing tank 1, and the bottom of the piston rod 20 is fixedly connected to the top surface of the mounting ring 16. An exhaust pipe 9 and an intake pipe 6 communicating with the interior of the mixing tank 1 are installed on the top of the air cylinder 5. Both the exhaust pipe 9 and the intake pipe 6 are equipped with one-way valves. The arrangement of the air cylinder 5 and the piston rod 20 not only connects the mounting ring 16 using the piston rod 20, but also allows for... As the ring 16 moves up and down, it drives the piston rod 20 to move up and down synchronously. When the piston rod 20 moves down, it drives the piston plate down, thereby drawing air from the mixing tank 1 into the air cylinder 5 through the suction pipe 6, thus reducing the pressure inside the mixing tank 1. When the piston rod 20 moves up, it drives the piston plate up, thereby expelling the air from the air cylinder 5 through the exhaust pipe 9. In this way, during the up and down reciprocating motion of the ring 16, the air inside the mixing tank 1 can be automatically discharged, thereby facilitating the creation of negative pressure inside the mixing tank 1.

[0042] The above embodiments are merely preferred embodiments of the present invention and should not be construed as limiting the scope of protection of the present invention. Any non-substantial changes and substitutions made by those skilled in the art based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A raw material mixing device for polyoxymethylene (POM) production, comprising a mixing tank, wherein a discharge pipe is installed at the bottom of one side of the mixing tank, characterized in that, The mixing tank is equipped with a stirring mechanism for mixing materials and a scraping mechanism for scraping off materials from the side wall of the mixing tank. The stirring mechanism includes a rotating shaft rotatably connected to the inner wall of the top of the mixing tank and a retractable stirring paddle fixed to the bottom of the rotating shaft. The scraping mechanism includes a scraper located inside the mixing tank and fixedly connected to the agitator, and a linkage component installed inside the mixing tank for driving the scraper and the agitator to move up and down reciprocally when the agitator rotates. It also includes a negative pressure mechanism installed on the top surface of the mixing tank drive. The negative pressure mechanism is connected to the linkage component and discharges the air inside the mixing tank to the outside when it is running. A pressure stabilizing pipe connected to the inside is installed on the top of the outer periphery of the mixing tank. A pressure valve is installed on the pressure stabilizing pipe so that when the pressure inside the mixing tank is less than a set value, the outside air can enter the mixing tank through the pressure stabilizing pipe.

2. The raw material mixing equipment for polyoxymethylene production according to claim 1, characterized in that, The mixing tank has a feed inlet at the top, and a top cover for sealing the feed inlet is hinged to the top surface of the mixing tank via a hinge. The side of the top cover away from the hinge is fixed to the top of the mixing tank by a latch.

3. The raw material mixing equipment for polyoxymethylene production according to claim 1, characterized in that, The stirring paddle includes a fixed rod fixed to the bottom of the rotating shaft, a movable tube movably sleeved on the outer periphery of the fixed rod, and multiple stirring rods fixed on the outer periphery of the movable tube. The fixed rod has a regular polygonal prism structure, and the inner ring of the movable tube matches the outer periphery of the fixed rod.

4. The raw material mixing equipment for polyoxymethylene production according to claim 1, characterized in that, The linkage component includes a connecting ring movably sleeved on the outer periphery of the rotating shaft and a guide member installed on the rotating shaft to drive the connecting ring to move up and down reciprocally when it rotates. The outer periphery of the connecting ring is fixed to the scraper through a connecting rod.

5. The raw material mixing equipment for polyoxymethylene production according to claim 4, characterized in that, The guide component includes a guide shaft sleeved on the outer circumference of the rotating shaft, a mounting ring movably sleeved on the outer circumference of the guide shaft, and a slide rod fixed on the inner ring of the mounting ring. The connecting ring is rotatably sleeved on the outer ring of the mounting ring. The outer circumference of the guide shaft is provided with a guide groove that is coaxial with and inclined to it. One end of the slide rod extends into the guide groove and slides therewith.

6. The raw material mixing equipment for polyoxymethylene production according to claim 5, characterized in that, The negative pressure mechanism is provided in multiple sets. The negative pressure mechanism includes an air cylinder installed on the top surface of the mixing tank, a piston plate installed inside the air cylinder, and a piston rod fixed to the bottom surface of the piston plate. The bottom of the air cylinder extends into the interior of the mixing tank, and the bottom of the piston rod is fixedly connected to the top surface of the mounting ring. An exhaust pipe and an intake pipe communicating with the interior of the mixing tank are installed on the top of the air cylinder. Both the exhaust pipe and the intake pipe are equipped with one-way valves.

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