A smart temperature-controlled vacuum degassing integrated equipment for the production of modified isocyanates

Abstract

This invention provides an integrated intelligent temperature-controlled vacuum degassing device for the production of modified isocyanates, relating to the field of vacuum degassing technology. It includes a mobile platform with a lifting platform driven by an electric actuator. A degassing vessel is fixedly mounted on the mobile platform, with a vessel lid directly above it and a first connecting seat fixedly installed on the top of the lid. A vacuum pump is fixedly installed on the top of the lifting platform. The device also includes a sealing assembly driven by the lifting platform and mounted on the first connecting seat, and a stirring assembly mounted on the vessel lid. The purpose of this technical solution is to effectively handle high-viscosity materials through an innovative bidirectional stirring and forced shearing circulation structure, significantly shortening degassing time and improving production efficiency. The intelligent temperature control system, linking stirring speed and heating power, ensures uniform heating of the material. The mechanical self-tightening seal design guarantees the sealing reliability and stability of the equipment during long-term operation in a high-temperature, high-vacuum environment, thus extending the equipment's lifespan.

Description

Technical Field

[0001] This invention relates to the field of vacuum degassing technology, and in particular to an integrated intelligent temperature-controlled vacuum degassing device for the production of modified isocyanates. Background Technology

[0002] Modified isocyanates are key raw materials for the production of high-end polyurethane coatings, adhesives, and sealants. During their production, the prepolymer often contains a large number of bubbles and trace amounts of low-boiling-point solvents after the reaction, requiring degassing treatment.

[0003] Traditional degassing processes for modified isocyanates employ separate degassing kettles. These kettles rely solely on vacuum suction, which makes it difficult to remove tiny bubbles from high-viscosity materials. Due to the high viscosity of modified isocyanates, degassing takes a long time, consumes a lot of energy, and is inefficient. Some degassing kettles designed for high-viscosity materials integrate heating functions, but thermal expansion and contraction can easily cause a decrease in the sealing of the degassing kettle, affecting the degassing effect over long-term use. Summary of the Invention

[0004] The purpose of this invention is to solve the shortcomings of traditional degassing kettles in the prior art, which have difficulty in removing tiny bubbles from high-viscosity materials and whose sealing performance is easily reduced due to thermal expansion and contraction after long-term use, thus affecting the degassing effect.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: an intelligent temperature-controlled vacuum degassing integrated device for the production of modified isocyanates, comprising a mobile platform, a lifting platform driven by an electric actuator mounted on the mobile platform, a degassing vessel fixedly mounted on the mobile platform, a vessel lid positioned directly above the degassing vessel with a first connecting seat fixedly mounted on the top of the vessel lid, the vessel lid being mounted on the lifting platform via the first connecting seat and rising and falling with the lifting platform, a vacuum pump fixedly mounted on the top of the lifting platform and fixedly connected to the vessel lid, and further comprising:

[0006] A sealing assembly, installed on the first connecting seat and driven by the lifting platform, is used to seal the gap between the degassing vessel and the vessel lid.

[0007] A stirring assembly installed on the vessel lid is used to stir and heat the high-viscosity modified isocyanate during vacuum degassing.

[0008] In at least some embodiments, a plurality of telescopic rods are fixedly installed on the top of the first connecting seat and a second connecting seat is fixedly installed on the top of the telescopic rods. The second connecting seat is fixedly installed at the bottom of the lifting platform. After the lifting platform drives the kettle lid to close, the lifting platform continues to descend to drive the sealing assembly to seal the degassing kettle.

[0009] In at least some embodiments, the sealing assembly includes a slide, a transverse seat, and a rotating rod. The slide has a pair of symmetrically fixedly welded to both ends of the first connecting seat. The transverse seat is slidably mounted on the slide. Each of the two transverse seats has a semi-circular sealing ring fixedly welded to one end close to the other. The two sealing rings are joined together to form a circular ring to seal the gap between the degassing vessel and the vessel lid. A connecting rod is rotatably mounted inside the slide. A sliding groove is provided on the connecting rod. A driving rod is provided inside the transverse seat, and the driving rod is slidably adapted to the sliding groove on the connecting rod.

[0010] In at least some embodiments, one end of the rotating rod is rotatably mounted on the lifting platform, and the other end of the rotating rod is rotatably mounted with a roller. A torsion spring is fixedly installed between the shaft of the connecting rod and the slide block to ensure that the connecting rod is in close contact with the roller. The lifting platform descends relative to the vessel lid and drives the connecting rod to rotate via the rotating rod, thereby driving the two sealing rings to dock and assemble.

[0011] In at least some embodiments, the stirring assembly includes a stirring shaft, a rotary joint, and a pumping box. The stirring shaft is rotatably mounted on the vessel lid. A motor for driving the stirring shaft to rotate is fixedly mounted on the first connecting seat. A roller with a wider diameter is fixedly welded to the top of the stirring shaft. An inner spiral blade is fixedly welded to the outside of the roller. Two extension rods are fixedly welded to the outside of the roller, and outer spiral blades are fixedly welded to the two extension rods. The inner and outer spiral blades have opposite spiral directions. The rotation of the outer spiral blades causes the material to rise, while the rotation of the inner spiral blades causes the material to fall.

[0012] In at least some embodiments, through holes are arrayed on the roller along the helical direction of the inner helical blades, and the direction of the through holes is tangent to the roller. During the process of the inner helical blades driving the material to descend, the material passes through the through holes and enters the interior of the roller.

[0013] In at least some embodiments, the rotary joint and the pumping box are fixedly installed on the top of the vessel lid. The roller is provided with a heat exchange tube, and both ends of the heat exchange tube pass through the stirring shaft. The two ends of the heat exchange tube are connected to the pumping box through the rotary joint. A box cover is fixedly installed on the top of the pumping box, and a turntable is rotatably installed inside the box cover. A pumping plate is slidably installed on the turntable. A driven gear is fixedly installed on the shaft at the top of the turntable. A driving gear that meshes with the driven gear is fixedly installed on the top of the stirring shaft. An electric heating wire is integrated at the bottom of the pumping box, and the pumping box is filled with heat exchanger. The faster the stirring shaft rotates, the higher the pumping efficiency of the heat exchanger in the pumping box.

[0014] In at least some embodiments, the turntable is eccentrically positioned relative to the pumping box, and the length of the pumping plate is equal to the inner diameter of the pumping box.

[0015] Compared with the prior art, the advantages and positive effects of the present invention are as follows:

[0016] 1. This invention employs a unique bidirectional stirring and forced circulation shearing design, which greatly improves the degassing efficiency of high-viscosity materials. When the inner and outer spiral blades rotate in opposite directions, the outer spiral blades lift the material in the periphery of the vessel, while the inner spiral blades press down the material in the central area, forming a strong vertical convection in the vessel. During the descent, the material is forced through the tangential through-holes on the roller, generating a huge shearing force that can effectively break up tiny bubbles, causing them to quickly converge and be removed. This synergistic effect of mechanical stirring and vacuum suction significantly shortens the degassing time and reduces energy consumption.

[0017] 2. In this invention, an intelligent and adaptive temperature control system is integrated to achieve efficient and uniform heating. The rotation speed of the stirring shaft directly drives the eccentric pump mechanism in the pump box. The faster the rotation speed, the faster the heat exchanger circulates in the heat exchange tube, which means that the heating / cooling power of the material is intelligently adjusted according to the stirring speed.

[0018] 3. In this invention, the innovative mechanical self-tightening sealing component effectively solves the problem of sealing failure caused by thermal expansion and contraction in traditional equipment. By utilizing the continuous downward pressure of the lifting platform, the vertical motion is converted into horizontal clamping force through the lever mechanism, driving the two semi-annular sealing rings to tightly fit against the degassing vessel inlet, forming a reliable seal. This structure ensures that the equipment can maintain a high vacuum under long-term high-temperature conditions, greatly improving the stability of the degassing effect and the service life of the equipment. Attached Figure Description

[0019] Figure 1 This invention presents an overall three-dimensional schematic diagram of an integrated intelligent temperature-controlled vacuum degassing device for the production of modified isocyanates;

[0020] Figure 2 This invention provides a schematic diagram of the degassing vessel in an intelligent temperature-controlled vacuum degassing integrated equipment for the production of modified isocyanates;

[0021] Figure 3 This invention provides a schematic diagram of the structure of the first connecting seat in an intelligent temperature-controlled vacuum degassing integrated device for the production of modified isocyanates;

[0022] Figure 4 This invention provides a schematic diagram of the sealing component in an intelligent temperature-controlled vacuum degassing integrated equipment for the production of modified isocyanates;

[0023] Figure 5 This invention provides a schematic diagram of the stirring component in an intelligent temperature-controlled vacuum degassing integrated equipment for the production of modified isocyanates;

[0024] Figure 6This invention provides a schematic diagram of the internal structure of the rollers in an intelligent temperature-controlled vacuum degassing integrated equipment for the production of modified isocyanates.

[0025] Figure 7 This invention presents a schematic diagram of the internal structure of the pump box in an intelligent temperature-controlled vacuum degassing integrated equipment for the production of modified isocyanates.

[0026] Legend: 1. Mobile platform;

[0027] 2. Lifting platform;

[0028] 3. Degassing kettle;

[0029] 4. Cauldron cover;

[0030] 5. First connecting seat; 501. Telescopic rod; 502. Second connecting seat;

[0031] 6. Vacuum pump;

[0032] 7. Sealing assembly; 701. Slide; 702. Transverse slide; 703. Rotating rod; 704. Sealing ring; 705. Connecting rod; 706. Roller;

[0033] 8. Stirring assembly; 801. Stirring shaft; 802. Rotary joint; 803. Pumping box; 804. Roller; 805. Inner spiral blade; 806. Outer spiral blade; 807. Through hole; 808. Heat exchange tube; 809. Turntable; 810. Pumping plate; 811. Driven gear; 812. Driven gear. Detailed Implementation

[0034] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described below in conjunction with the accompanying drawings and embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0035] Numerous specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways than those described herein, and therefore the invention is not limited to the specific embodiments disclosed in the following specification.

[0036] Implementation examples, based on Figures 1-7 The present invention provides an integrated intelligent temperature-controlled vacuum degassing device for the production of modified isocyanates, comprising a mobile platform 1, such as... Figure 1 and Figure 2As shown, a lifting platform 2 driven by an electric actuator is installed on the mobile platform 1. A degassing vessel 3 is fixedly mounted on the mobile platform 1. A vessel cover 4 is provided directly above the degassing vessel 3, and a first connecting seat 5 is fixedly installed on the top of the vessel cover 4. The vessel cover 4 is installed on the lifting platform 2 through the first connecting seat 5 and rises and falls with the lifting platform 2. A vacuum pump 6 is fixedly installed on the top of the lifting platform 2 and is fixedly connected to the vessel cover 4. It also includes a sealing assembly 7 installed on the first connecting seat 5 and driven by the lifting platform 2 to seal the gap between the degassing vessel 3 and the vessel cover 4. A stirring assembly 8 is installed on the vessel cover 4 to stir and heat the high viscosity modified isocyanate during the vacuum degassing process.

[0037] like Figure 3 and Figure 4 As shown, multiple telescopic rods 501 are fixedly installed on the top of the first connecting seat 5, and a second connecting seat 502 is fixedly installed on the top of the telescopic rods 501. The second connecting seat 502 is fixedly installed at the bottom of the lifting platform 2. After the lifting platform 2 drives the kettle cover 4 to close, the lifting platform 2 continues to descend and drives the sealing assembly 7 to seal the degassing kettle 3. The sealing assembly 7 includes a slide seat 701, a transverse moving seat 702, and a rotating rod 703. The slide seat 701 has a pair of symmetrically fixed and welded to both ends of the first connecting seat 5. The transverse moving seat 702 is slidably installed on the slide seat 701. The two transverse moving seats 702 are close to each other, and a semi-circular sealing ring 704 is fixedly welded to one end of each of them. After the 704 is joined in a circular shape, it seals the gap between the degassing vessel 3 and the vessel cover 4. A connecting rod 705 is rotatably installed in the slide 701. A groove is opened on the connecting rod 705. A drive rod is provided in the transverse seat 702 and the drive rod slides and adapts to the groove on the connecting rod 705. One end of the rotating rod 703 is rotatably installed on the lifting platform 2, and the other end of the rotating rod 703 is rotatably installed with a roller 706. A torsion spring is fixedly installed between the shaft of the connecting rod 705 and the slide 701 to ensure that the connecting rod 705 is in close contact with the roller 706. The lifting platform 2 descends relative to the vessel cover 4 and drives the connecting rod 705 to rotate through the rotating rod 703 to drive the two sealing rings 704 to dock and combine.

[0038] The equipment is started, and the electric actuator of the lifting platform 2 is controlled to drive the lifting platform 2 to descend as a whole. The first connecting seat 5 and the fixed lid 4 move down together through the second connecting seat 502 and the telescopic rod 501 until the lid 4 is stably closed on the degassing vessel 3.

[0039] At this time, the lid closing action is completed, but the sealing has not yet started. The electric push rod continues to work, and the lifting platform 2 continues to descend relative to the stationary lid 4, compressing the telescopic rod 501. During this process, the rotating rod 703 fixed on the lifting platform 2 descends accordingly, and the roller 706 at its end presses the tail of the connecting rod 705. Since the connecting rod 705 is always in close contact with the roller 706 through the torsion spring, the pressure causes the connecting rod 705 to rotate.

[0040] The rotation of the connecting rod 705, through the cooperation of the sliding groove on it and the drive rod on the transverse seat 702, converts the rotational motion into the horizontal linear motion of the transverse seat 702 on the slide seat 701. The two transverse seats 702 move towards each other, eventually causing the two semi-annular sealing rings 704 fixed on them to fit tightly together, forming a complete sealing ring 704, which firmly holds the mouth of the degassing kettle 3, realizing a mechanical self-tightening seal. This sealing force is not affected by thermal expansion and contraction.

[0041] After sealing is completed, start vacuum pump 6 to evacuate the inner cavity of degassing vessel 3. At the same time, start motor installed on first connecting seat 5 to drive stirring shaft 801 to rotate. Stirring shaft 801 drives roller 804, inner spiral blade 805 and outer spiral blade 806 to rotate together.

[0042] like Figure 5 As shown, the stirring assembly 8 includes a stirring shaft 801, a rotary joint 802, and a pumping box 803. The stirring shaft 801 is rotatably mounted on the vessel cover 4. A motor that drives the stirring shaft 801 to rotate is fixedly mounted on the first connecting seat 5. A wider diameter roller 804 is fixedly welded to the top of the stirring shaft 801. An inner spiral blade 805 is fixedly welded to the outside of the roller 804. Two extension rods are fixedly welded to the outside of the roller 804, and an outer spiral blade 806 is fixedly welded to the two extension rods. The spiral directions of the inner spiral blade 805 and the outer spiral blade 806 are opposite. The rotation of the outer spiral blade 806 drives the material to rise, while the rotation of the inner spiral blade 805 drives the material to fall. Through holes 807 are arrayed on the roller 804 along the spiral direction of the inner spiral blade 805. The direction of the through holes 807 is tangent to the roller 804. During the process of the inner spiral blade 805 driving the material to fall, it passes through the through holes 807 and enters the interior of the roller 804.

[0043] In this process, since the outer spiral blade 806 and the inner spiral blade 805 have opposite spiral directions, a strong material convection is formed in the reactor during stirring. The outer spiral blade 806 conveys the material in the edge area upward, while the inner spiral blade 805 squeezes the material in the center area downward. Under pressure, the downward material is forced to pass through the through holes 807 on the side wall of the roller 804. These tangentially arranged through holes 807 generate a huge shearing and squeezing effect on the high-viscosity material, which can effectively shear and merge the tiny bubbles that are difficult to remove from the material, so that they become large bubbles and then quickly break down and are extracted in a vacuum environment. This dual degassing mechanism of mechanical shearing and crushing plus vacuum suction greatly improves the degassing efficiency and effect.

[0044] like Figure 6As shown, the rotary joint 802 and the pumping box 803 are fixedly installed on the top of the vessel cover 4. A heat exchange tube 808 is provided inside the roller 804, and both ends of the heat exchange tube 808 pass through the stirring shaft 801. The two ends of the heat exchange tube 808 are connected to the pumping box 803 through the rotary joint 802. A box cover is fixedly installed on the top of the pumping box 803, and a turntable 809 is rotatably installed inside the box cover. A pumping plate 810 is slidably installed on the turntable 809. A driven gear 811 is fixedly installed on the shaft at the top of the turntable 809. A driving gear 812, meshing with the driven gear 811, is fixedly installed on the top of the stirring shaft 801. An electric heating wire is integrated at the bottom of the pumping box 803, and the pumping box 803 is filled with heat exchanger. The faster the stirring shaft 801 rotates, the higher the pumping efficiency of the heat exchanger in the pumping box 803. Figure 7 As shown, the turntable 809 is eccentrically positioned relative to the pump box 803, and the length of the pump plate 810 is equal to the inner diameter of the pump box 803.

[0045] The top of the stirring shaft 801 is equipped with a driving gear 812, which meshes with the driven gear 811 on the pump box 803. Therefore, the rotation of the stirring shaft 801 simultaneously drives the turntable 809 inside the pump box 803 to rotate. The turntable 809 is eccentrically mounted, and the pumping plate 810 sliding on it reciprocates under the constraint of centrifugal force and the inner wall of the pump box 803. Its function is similar to the blade of an eccentric rotor pump.

[0046] When the stirring motor runs at low speed, the turntable 809 rotates slowly, and the heat exchanger circulates slowly. When rapid stirring is required to enhance degassing, the motor runs at high speed, the turntable 809 rotates faster, and the pumping efficiency of the pumping plate 810 increases dramatically. This drives the heat exchanger (such as heat transfer oil) heated by the electric heating wire in the pumping box 803 to flow at high speed through the rotary joint 802 and into the heat exchange tube 808 inside the stirring shaft 801. After circulating in the roller 804, it returns to the pumping box 803, forming a closed heating circuit.

[0047] The high-speed circulating heat exchanger efficiently and evenly transfers heat to the material through the 804 roller wall. The stirring speed and heating power are directly linked. The faster the stirring, the more intense the material flow and shearing, and the stronger the heating, in order to meet the greater heat energy required by high-viscosity materials during vigorous movement and prevent uneven temperature. When stirring slows down, the heating also automatically weakens, realizing "automated physical intelligent temperature control". This ensures that the material is always at the optimal and uniform process temperature throughout the degassing process, improving product quality and avoiding energy waste.

[0048] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention in any other way. Any person skilled in the art may make changes or modifications to the above-disclosed technical content to create equivalent embodiments that can be applied to other fields. However, any simple modifications, equivalent changes, and modifications made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the protection scope of the present invention.

Claims

1. An intelligent temperature control vacuum defoaming integrated device for modified isocyanate production, comprising a mobile platform (1), characterized in that: The mobile platform (1) is provided with an electric push rod driven lifting platform (2), the mobile platform (1) is fixedly provided with a defoaming kettle (3), the defoaming kettle (3) is provided with a kettle cover (4) above and the first connecting seat (5) is fixedly installed on the top of the kettle cover (4), the kettle cover (4) is installed on the lifting platform (2) through the first connecting seat (5) and is lifted with the lifting platform (2), the lifting platform (2) is fixedly provided with a vacuum pump (6) on the top and the vacuum pump (6) is fixedly communicated with the kettle cover (4), further comprising: The sealing assembly (7) is installed on the first connecting seat (5) and is driven by the lifting platform (2) to seal the gap between the defoaming kettle (3) and the kettle cover (4); The stirring assembly (8) is installed on the kettle cover (4) to stir and heat the modified isocyanate with high viscosity during the vacuum defoaming process, the stirring assembly (8) comprises a stirring shaft (801), a rotary joint (802) and a pumping box (803), the stirring shaft (801) is rotatably installed on the kettle cover (4), the first connecting seat (5) is fixedly provided with a motor for driving the stirring shaft (801) to rotate, the stirring shaft (801) is fixedly welded with a wider roller (804) on the top, the outer side of the roller (804) is fixedly welded with an inner spiral blade (805), the outer side of the roller (804) is fixedly welded with two extension rods and the outer spiral blade (806) is fixedly welded on the two extension rods, the spiral directions of the inner spiral blade (805) and the outer spiral blade (806) are opposite, the outer spiral blade (806) rotates to bring the material upwards and the inner spiral blade (805) rotates to bring the material downwards, the through hole (807) is arranged along the spiral direction of the inner spiral blade (805) on the roller (804), the direction of the through hole (807) is tangent to the roller (804), the inner spiral blade (805) drives the material to pass through the through hole (807) and enter the inside of the roller (804) during the descending process.

2. The intelligent temperature control vacuum devolatilization integrated device for producing modified isocyanate according to claim 1, characterized in that: A plurality of telescopic rods (501) are fixedly installed on the top of the first connecting seat (5) and the second connecting seat (502) is fixedly installed on the top of the telescopic rod (501), the second connecting seat (502) is fixedly installed on the bottom of the lifting platform (2), the lifting platform (2) continues to descend to drive the sealing assembly (7) to seal the defoaming kettle (3) after the kettle cover (4) is closed.

3. The intelligent temperature control vacuum devolatilization integrated device for producing modified isocyanate according to claim 1, characterized in that: The sealing assembly (7) comprises a sliding seat (701), a transverse moving seat (702) and a rotating rod (703), the sliding seat (701) is fixedly welded on both sides of the first connecting seat (5), the transverse moving seat (702) is slidingly installed on the sliding seat (701), and the two transverse moving seats (702) are fixedly welded with a semicircular sealing ring (704) at one end close to each other, the two sealing rings (704) are abutted to form a circular ring, and the gap between the deaeration kettle (3) and the kettle cover (4) is sealed, the connecting rod (705) is rotatably installed in the sliding seat (701), the sliding groove is formed in the connecting rod (705), and the driving rod is arranged in the transverse moving seat (702) and is slidingly matched with the sliding groove in the connecting rod (705).

4. The intelligent temperature control vacuum devolatilization integrated device for producing modified isocyanate according to claim 3, characterized in that: One end of the rotating rod (703) is rotatably installed on the lifting platform (2), the other end of the rotating rod (703) is rotatably installed with a roller (706), the torsional spring is fixedly installed between the shaft of the connecting rod (705) and the sliding seat (701), so that the connecting rod (705) is tightly attached to the roller (706), and the lifting platform (2) is lowered relative to the kettle cover (4) and drives the connecting rod (705) to rotate through the rotating rod (703), so as to drive the two sealing rings (704) to abut and combine.

5. The intelligent temperature control vacuum devolatilization integrated device for producing modified isocyanate according to claim 1, characterized in that: The rotary joint (802) and the pumping box (803) are fixedly installed on the top of the kettle cover (4), the roller (804) is provided with heat exchange pipes (808), and the two ends of the heat exchange pipes (808) penetrate the stirring shaft (801), the two ends of the heat exchange pipes (808) are communicated with the pumping box (803) through the rotary joint (802), the box cover is fixedly installed on the top of the pumping box (803), and the rotating disc (809) is rotatably installed in the box cover, the pumping plate (810) is slidingly installed on the rotating disc (809), the driven gear (811) is fixedly installed on the shaft at the top of the rotating disc (809), the driving gear (812) meshed with the driven gear (811) is fixedly installed on the top of the stirring shaft (801), the electric heating wire is integrated on the bottom of the pumping box (803), and the pumping box (803) is filled with heat exchange agent, the faster the stirring shaft (801) rotates, and the higher the pumping efficiency of the heat exchange agent in the pumping box (803) is.

6. The intelligent temperature control vacuum devolatilization integrated device for producing modified isocyanate according to claim 5, characterized in that: The rotating disc (809) is eccentrically arranged relative to the pumping box (803), and the length of the pumping plate (810) is equal to the inner diameter of the pumping box (803).

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