Physical foaming PBT copolyester production reaction kettle

Abstract

The utility model relates to the technical field of PBT copolyester physical foaming production, in particular to a physical foaming PBT copolyester production reaction kettle which comprises a kettle body, a supporting frame is fixed to the center of the top of the kettle body, an air cylinder is embedded in the supporting frame, a telescopic rod is arranged at the bottom of the air cylinder in a sliding mode, a limiting table is arranged at the lower end of the telescopic rod in a sleeved mode, and the limiting table is connected with the kettle body. A second rotary table is fixed to the position, located at the lower end of the first rotary table, of the telescopic rod, arc-shaped sliding blocks are evenly fixed to the top of the second rotary table around the center, supporting rods are evenly fixed to the bottom of the second rotary table around the center, and arc-shaped grooves are evenly formed in the second rotary table around the center in an up-down penetrating mode; connecting columns uniformly slide in the arc grooves, stirring rods are fixed to the bottoms of the connecting columns, the stirring rods extend and contract along the arc grooves and the supporting rod sliding rails through reverse rotation of the motor, the interior of the kettle body is conveniently and rapidly cleaned through forward rotation of the motor, and the service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of PBT copolyester physical foaming production, in particular to a physical foaming PBT copolyester production reactor. Background Art

[0002] Physical foaming PBT copolyester is a process of forming a foam structure in PBT copolyester by using physical foaming technology. The foaming agent is injected into the molten PBT copolyester through a reactor, and is mixed with the PBT copolyester melt at a high temperature, so as to generate bubbles in the PBT copolyester and form a foam material.

[0003] The existing physical foaming PBT copolyester usually quantitatively injects a supercritical foaming agent into the molten PBT copolyester, forms a uniform unidirectional melt through screw mixing, and is injected into a cavity. Due to the thermodynamic instability and pressure changes during the injection process, a large number of bubble nuclei are formed inside the product. During the filling and cooling processes, the bubbles grow and are fixed, obtaining a microcellular foamed product. This physical foaming technology can endow the PBT copolyester product with the characteristics of light weight, good insulation performance, and strong impact absorption performance.

[0004] However, when the existing PBT copolyester is physically foamed, the reactor often needs to be heated, which easily causes a large amount of reactants to be adsorbed on the entire inner wall of the reactor and is not easy to clean. Therefore, a physical foaming PBT copolyester production reactor is proposed to solve the above problems. Summary of the Utility Model

[0005] In order to make up for the deficiencies of the prior art and solve the problems existing in the existing equipment, the utility model provides a physical foaming PBT copolyester production reactor.

[0006] The technical solution adopted by the present utility model to solve its technical problems is a physical foaming PBT copolyester production reactor, including a reactor body. A support frame is fixed at the center of the top of the reactor body, and a discharge pipe is fixed at the center of the bottom of the reactor body. A motor is fixed on one side of the top of the reactor body, and a first helical gear is fixed at the output end of the motor. A cylinder is embedded in the support frame, and a straight bevel gear is fixed at the top of the cylinder. The first helical gear and the straight bevel gear are meshed and connected. A telescopic rod is slidably arranged at the bottom of the cylinder, and a protective cylinder is fixed at the bottom of the telescopic rod. A limiting platform is sleeved at the lower end of the telescopic rod. Card slots are evenly arranged around the center in the bottom of the limiting platform. A first turntable is sleeved at the lower end of the telescopic rod where the telescopic rod is located. Protrusions are evenly fixed around the center on the outer shaft body of the first turntable. A second turntable is fixed at the lower end of the telescopic rod where the telescopic rod is located. Arc-shaped sliders are evenly fixed around the center on the top of the second turntable. Support rods are evenly fixed around the center on the bottom of the second turntable. Arc-shaped grooves are evenly arranged through the second turntable around the center up and down. Connecting columns are evenly slidably arranged in the arc-shaped grooves. Stirring rods are fixed at the bottoms of the connecting columns. By reversely rotating the motor, the stirring rods are contracted along the arc-shaped grooves and the slide rails of the support rods. By forwardly rotating the motor, the protrusions on the first turntable contact the right-angle sides of the arc-shaped sliders on the second turntable, causing the stirring rods to rotate, thereby facilitating the rapid cleaning of the inside of the reactor body and improving the service life.

[0007] Preferably, a first feed pipe is fixed on one side of the upper shaft body of the reactor body, and a second feed pipe is fixed on the other side of the upper shaft body of the reactor body. Through the two feed pipes, when there is a single feed pipe, when PBT copolyester is first transported and then the foaming agent is transported, after the previous physical foaming is completed and the reactor body is not completely cooled, part of the PBT copolyester foams in the feed pipe, thus blocking the feed pipe.

[0008] Preferably, the limiting platform, the first turntable and the second turntable are all arranged in the protective cylinder, and the first turntable is slidably arranged on the telescopic rod. The protective cylinder prevents the foamed PBT copolyester from entering the limiting platform, the first turntable and the second turntable, affecting the operation of the mechanism.

[0009] Preferably, the stirring rod is slidably arranged in the support rod. The inner side of the stirring rod is square, and the outer side is semi-sector-shaped, enabling the stirring rod to slide and unfold.

[0010] Preferably, a bearing is embedded at the center of the lower end in the support frame, and the cylinder is embedded in the bearing. Through the bearing, the cylinder can be fixed at the upper end inside the reactor body and rotate.

[0011] Preferably, springs are evenly fixed around the center on the top of the first turntable, and the tops of the springs are fixedly connected to the bottom of the limiting platform. Through the springs, the first turntable slides into the bottom of the limiting platform, enabling the first turntable to slide along the arc-shaped side of the arc-shaped slider during rotation, and not restricting the sliding of the stirring rod on the support rod.

[0012] The beneficial effects of the present utility model are as follows: By reversing the rotation of the motor, the stirring rod contracts along the arc groove and the slide rail of the support rod. By rotating the motor forward, the convex block on the first turntable contacts the right-angled side of the arc-shaped slider on the second turntable. By rotating the motor forward and backward, it is convenient to adjust the extended length of the stirring rod, which is convenient to adapt to reaction kettles with different bottom diameters, convenient for quickly cleaning the inside of the kettle body, and improves the service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0014] Figure 1 Is the axonometric schematic diagram of the present utility model;

[0015] Figure 2 Is the axonometric semi-sectional schematic diagram of the present utility model;

[0016] Figure 3 Is the enlarged axonometric semi-sectional partial schematic diagram of the present utility model;

[0017] Figure 4 Is the enlarged axonometric semi-sectional schematic diagram of the protective cylinder of the present utility model;

[0018] Figure 5 Is the enlarged exploded schematic diagram of the limit platform, the first turntable, and the second turntable of the present utility model;

[0019] Figure 6 Is the enlarged exploded schematic diagram of the limit platform, the first turntable, and the second turntable of the present utility model.

[0020] LEGEND DESCRIPTION:

[0021] 1. Kettle body; 2. First feed pipe; 3. Second feed pipe; 4. Discharge pipe; 5. Motor; 6. Support frame; 7. Cylinder; 8. Telescopic rod; 9. Protective cylinder; 10. First helical gear; 11. Straight bevel gear; 12. Card slot; 13. Limit platform; 14. First turntable; 15. Second turntable; 16. Support rod; 17. Stirring rod; 18. Convex block; 19. Spring; 20. Arc-shaped slider; 21. Arc groove; 22. Connecting column. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present utility model in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts belong to the scope of protection of the present utility model.

[0023] Please refer to Figures 1-6 As shown in the figure, a physical foaming PBT copolyester production reactor includes a reactor body 1. A support frame 6 is fixed at the center of the top of the reactor body 1. A discharge pipe 4 is fixed at the center of the bottom of the reactor body 1. A motor 5 is fixed on one side of the top of the reactor body 1. A first helical gear 10 is fixed at the output end of the motor 5. A cylinder 7 is embedded in the support frame 6. A straight bevel gear 11 is fixed at the top of the cylinder 7. The first helical gear 10 and the straight bevel gear 11 are meshed and connected. A telescopic rod 8 is slidably arranged at the bottom of the cylinder 7. A protective cylinder 9 is fixed at the bottom of the telescopic rod 8. A limiting platform 13 is sleeved at the lower end of the telescopic rod 8. A card slot 12 is evenly opened around the center at the bottom of the limiting platform 13. A first turntable 14 is sleeved at the lower end of the telescopic rod 8 outside the limiting platform 13. A convex block 18 is evenly fixed around the center on the outer shaft body of the first turntable 14. A second turntable 15 is fixed at the lower end of the telescopic rod 8 where the telescopic rod 8 is located. An arc-shaped slider 20 is evenly fixed around the center at the top of the second turntable 15. A support rod 16 is evenly fixed around the center at the bottom of the second turntable 15. An arc groove 21 is evenly opened through the second turntable 15 around the center. A connecting column 22 is evenly slid in the arc groove 21. A stirring rod 17 is fixed at the bottom of each connecting column 22.

[0024] When physically foaming PBT copolyester for production, the PBT copolyester and the foaming agent are respectively fed into the reaction kettle through the first feed pipe 2 and the second feed pipe 3. By using two feed pipes, it is avoided that a single feed pipe foams in the feed pipe when respectively feeding the PBT copolyester and the foaming agent, thus blocking the feed pipe. By starting the motor 5 to drive the cylinder 7 to rotate forward in the support frame 6, the convex block 18 on the outer side of the first turntable 14 contacts the right-angled side of the arc-shaped slider 20, so that the stirring rod 17 rotates in the kettle body 1 along with the second turntable 15 to stir the PBT copolyester and the foaming agent. By the cylinder 7, the telescopic rod 8 moves up and down, so that the PBT copolyester and the foaming agent in the kettle body 1 are fully fused, improving the foaming efficiency of the PBT copolyester in the kettle body 1. The bottom of the kettle body 1 is usually in an inverted circular and inverted funnel shape, which is prone to generating cleaning dead corners. When cleaning the inside of the kettle body 1, the motor 5 rotates in the reverse direction, so that the second turntable 15 rotates in the reverse direction. The convex block 18 on the outer side of the first turntable 14 slides into the card slot 12 at the bottom of the limit table 13 through the spring 19 and the arc-shaped slider 20, so that it no longer unidirectionally restricts the rotation of the second turntable 15, and the connecting column 22 moves along the arc groove 21 and through the slide rail on the support rod 16 to make the stirring rod 17 approach the center of the second turntable 15, reducing the extension length of the stirring rod 17, adapting to the gradually decreasing space at the bottom of the kettle body 1, facilitating the cleaning of dead corners, and improving the service life of the reaction kettle.

[0025] One side of the upper shaft body of the kettle body 1 is fixedly provided with a first feed pipe 2, and the other side of the upper shaft body of the kettle body 1 is fixedly provided with a second feed pipe 3. By using two feed pipes, when there is a single feed pipe, when first feeding the PBT copolyester and then feeding the foaming agent, after the previous physical foaming is completed and the kettle body 1 is not completely cooled, part of the PBT copolyester foams in the feed pipe, thus blocking the feed pipe. The limit table 13, the first turntable 14 and the second turntable 15 are all arranged in the protection cylinder 9. The first turntable 14 is slidably arranged on the telescopic rod 8. By the protection cylinder 9, it is avoided that the foamed PBT copolyester enters the limit table 13, the first turntable 14 and the second turntable 15, affecting the operation of the mechanism.

[0026] The stirring rod 17 is slidably arranged in the support rod 16. The inner side of the stirring rod 17 is square-shaped and the outer side is semi-sector-shaped, so that the stirring rod 17 can slide and expand. A bearing is embedded at the center of the lower end in the support frame 6, and a cylinder 7 is embedded in the bearing. By the bearing, the cylinder 7 can be fixed at the upper end in the kettle body 1 and rotate. The top of the first turntable 14 is evenly fixed with springs 19 around the center, and the top of the springs 19 is fixedly connected with the bottom of the limit table 13. By the springs 19, the first turntable 14 slides into the bottom of the limit table 13, so that when the first turntable 14 rotates, the convex block 18 slides along the arc-shaped side of the arc-shaped slider 20, and the sliding of the stirring rod 17 on the support rod 16 can be unrestricted.

[0027] Working principle: When physically foaming PBT copolyester, the PBT copolyester and the foaming agent are respectively transported into the reaction kettle through the first feed pipe 2 and the second feed pipe 3. By using two feed pipes, it is avoided that a single feed pipe foams in the feed pipe when transporting the PBT copolyester and the foaming agent respectively, thus blocking the feed pipe. By starting the motor 5 to drive the cylinder 7 to rotate forwardly in the support frame 6, the convex block 18 on the outer side of the first turntable 14 contacts the right-angle side of the arc-shaped slider 20, so that the stirring rod 17 rotates with the second turntable 15 and stirs the PBT copolyester and the foaming agent inside the kettle body 1. By the cylinder 7, the telescopic rod 8 moves up and down, so that the PBT copolyester and the foaming agent in the kettle body 1 are fully fused, improving the foaming efficiency of the PBT copolyester in the kettle body 1. The bottom of the kettle body 1 is usually in an inverted circular and inverted funnel shape, which is prone to generate cleaning dead corners. When cleaning the inside of the kettle body 1, the motor 5 rotates reversely, so that the second turntable 15 rotates reversely. The convex block 18 on the outer side of the first turntable 14 slides into the card slot 12 at the bottom of the limit platform 13 through the spring 19 and the arc-shaped slider 20, so that it no longer unidirectionally restricts the rotation of the second turntable 15, and the connecting column 22 moves along the arc groove 21 and through the slide rail on the support rod 16 to make the stirring rod 17 approach the center of the second turntable 15, reducing the extension length of the stirring rod 17, adapting to the gradually decreasing space at the bottom of the kettle body 1, facilitating the cleaning of dead corners, and improving the service life of the reaction kettle.

[0028] In the description of this specification, the descriptions referring to terms such as "one embodiment", "example", "specific example", etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0029] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A physical foaming PBT copolyester production reactor, characterized in that: The invention comprises a kettle body (1), a support frame (6) is fixed at the center of the top of the kettle body (1), a discharge pipe (4) is fixed at the center of the bottom of the kettle body (1), a motor (5) is fixed on one side of the top of the kettle body (1), a first bevel gear (10) is fixed at the output end of the motor (5), a cylinder (7) is embedded in the support frame (6), a straight face gear (11) is fixed on the top of the cylinder (7), the first bevel gear (10) and the straight face gear (11) are meshingly connected, a telescopic rod (8) is slidably arranged at the bottom of the cylinder (7), a protective tube (9) is fixed at the bottom of the telescopic rod (8), a limit platform (13) is sleeved on the lower end of the telescopic rod (8), and a center stopper (13) is provided at the bottom of the limit platform (13). The telescopic rod (8) is evenly provided with a card slot (12); the first turntable (14) is sleeved on the lower end of the limit platform (13); a convex block (18) is evenly fixed around the center on the outer shaft of the first turntable (14); the second turntable (15) is evenly fixed on the lower end of the telescopic rod (8) of the first turntable (14); an arc-shaped slider (20) is evenly fixed around the center on the top of the second turntable (15); a support rod (16) is evenly fixed around the center on the bottom of the second turntable (15); an arc groove (21) is evenly provided around the center of the second turntable (15); a connecting column (22) is evenly slid in the arc groove (21); a stirring rod (17) is fixed at the bottom of the connecting column (22).

2. A physical foaming PBT copolyester production reactor according to claim 1, characterized in that: A first feed pipe (2) is fixed on one side of the upper shaft of the kettle body (1), and a second feed pipe (3) is fixed on the other side of the upper shaft of the kettle body (1).

3. A physical foaming PBT copolyester production reactor according to claim 1, characterized in that: The limiting platform (13), the first rotating platform (14) and the second rotating platform (15) are all arranged in the protective tube (9), and the first rotating platform (14) is slidably arranged on the telescopic rod (8).

4. A physical foaming PBT copolyester production reactor according to claim 1, characterized in that: The stirring rod (17) is slidably arranged in the support rod (16); the inner side of the stirring rod (17) is square, and the outer side is semi-fan-shaped.

5. A physical foaming PBT copolyester production reactor according to claim 1, characterized in that: A bearing is embedded in the center of the lower end of the support frame (6), and a cylinder (7) is embedded in the bearing.

6. A physical foaming PBT copolyester production reactor according to claim 1, characterized in that: A spring (19) is evenly fixed around the center of the top of the first turntable (14), and the top of the spring (19) is fixedly connected to the bottom of the limiting platform (13).

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