Melamine formaldehyde resin synthesis reaction kettle

Abstract

The utility model provides a melamine formaldehyde resin synthesis reaction kettle which comprises a base, supporting rods in the vertical direction are fixedly installed on the top of the base in a rectangular array mode, a reaction tank is fixedly installed on the tops of the four supporting rods, and a rotating shaft in the vertical direction is rotatably installed on the reaction tank. The bottom of the rotating shaft extends into the reaction tank and is fixedly provided with a vertical mounting shell, and a plurality of groups of rotating units are mounted on the mounting shell in a linear array in the vertical direction. After reaction of raw materials in the reaction tank is completed, the top of the plugging block is flush with the inner bottom wall of the liquid outlet through the adjusting piece, when reactants in the reaction tank are discharged through the discharging pipe, the filter plate filters melamine formaldehyde resin to enable the melamine formaldehyde resin to remain in the discharging pipe, and waste liquid penetrates through the filter holes in the filter plate and is discharged through the liquid outlet. Therefore, the solid-liquid separation effect on the melamino-formaldehyde resin and the waste liquid is achieved, the melamino-formaldehyde resin and the waste liquid do not need to be subjected to solid-liquid separation additionally, the processing procedures are reduced, and the solid-liquid separation device is convenient to use.

Description

Technical Field

[0001] This utility model relates to the technical field of melamine-formaldehyde resin processing equipment, specifically to a melamine-formaldehyde resin synthesis reactor. Background Technology

[0002] Melamine-formaldehyde resin is an important thermosetting plastic widely used in furniture manufacturing, decorative materials, coatings, adhesives, and other fields. The synthesis of melamine-formaldehyde resin is usually carried out in a reaction vessel. During the synthesis of melamine-formaldehyde resin, melamine, formaldehyde aqueous solution, and catalyst are added to the reaction vessel to react. The raw materials are stirred and mixed by a stirrer in the reaction vessel to ensure that the reactants are fully mixed.

[0003] For example, the accompanying diagram in the instruction manual. Figure 6 The diagram shows the internal structure of a melamine-formaldehyde resin synthesis reactor in the prior art. It includes a reaction vessel with a vertically oriented rotating shaft rotatably mounted on it. The bottom of the rotating shaft extends into the reaction vessel and is fixedly mounted on a vertically oriented mounting shell. Multiple rotating units are linearly arrayed vertically on the mounting shell. Each rotating unit includes two horizontally oriented rotating rods rotatably mounted on either side of the mounting shell. The ends of the two rotating rods that are close to each other extend into the mounting shell, while the ends that are far apart are fixedly fitted with stirring blades. A rotating shaft is rotatably mounted on the rotating shaft, and the rotating shaft and the rotating shaft are located on the same axial direction. The bottom end of the rotating shaft extends into the mounting housing. One end of the rotating shaft extending into the mounting housing is coaxially fixed to a bevel gear. A second bevel gear, located on the rotating shaft and inside the mounting housing, is coaxially fixed to and meshes with two symmetrical first bevel gears. A motor is fixedly mounted on the reaction vessel. The output shaft of the motor is coaxially fixed to a driving bevel gear. Both the rotating shaft and the rotating shaft are coaxially fixed to driven bevel gears that mesh with the driving bevel gears. The top of the reaction vessel has an opening that connects to its interior. The reactor has a connected feed inlet, and a sealing mechanism is installed on the feed inlet to seal or unseal it. A discharge port connected to the interior is located at the bottom of the reactor, and a discharge pipe with a discharge valve is fixedly installed at the bottom of the reactor and inside the discharge port. During use, melamine, formaldehyde aqueous solution, and catalyst are fed into the reactor through the feed inlet. The motor is then turned on, and the motor output shaft rotates, driving the drive bevel gear. This, in turn, drives the rotating shaft to rotate inside the reactor via two driven bevel gears. The rotating shaft rotates, causing the housing to rotate around the shaft, which in turn drives multiple stirring blades to rotate around the shaft. The rotation of the shaft also drives bevel gear one to rotate, which in turn drives two rotating rods to rotate, causing the stirring blades to rotate around the rods. This multiple rotation of the stirring blades around the shaft further mixes the raw materials in the reactor, improving the mixing effect and promoting thorough mixing of the reactants. However, in actual use, the following drawbacks exist:

[0004] After the raw materials in the reaction vessel have reacted to form melamine-formaldehyde resin, there is still waste liquid in the reaction vessel. In the above-mentioned prior art reaction vessel, when the reactants in the reaction vessel are fed, the discharge valve is opened and the melamine-formaldehyde resin and waste liquid in the reaction vessel can be discharged through the discharge pipe. The operation is simple. However, after the reactants in the reaction vessel are fed, the melamine-formaldehyde resin and waste liquid need to be separated into solid and liquid, which increases the processing steps and is more troublesome.

[0005] Therefore, this application proposes a melamine-formaldehyde resin synthesis reactor. Utility Model Content

[0006] To address the shortcomings of existing technologies, this invention provides a melamine-formaldehyde resin synthesis reactor, which solves the problems mentioned in the background section.

[0007] To achieve the above objectives, this utility model provides the following technical solution:

[0008] The melamine-formaldehyde resin synthesis reactor includes a base. Vertical support rods are fixedly mounted in a rectangular array on the top of the base. A reaction vessel is fixedly mounted on the top of the four support rods. A vertically oriented rotating shaft is rotatably mounted on the reaction vessel. The bottom of the rotating shaft extends into the reaction vessel and is fixedly mounted on a vertically oriented mounting shell. Multiple rotating units are linearly arranged vertically on the mounting shell. Each rotating unit includes two horizontally oriented rotating rods rotatably mounted on either side of the mounting shell. The ends of the two rotating rods that are close to each other extend into the mounting shell. A stirring blade is fixedly installed at one end of each object, and a rotating shaft is rotatably installed on the rotating shaft. The rotating shaft and the rotating shaft are located on the same axis, and the bottom end of the rotating shaft extends into the mounting shell. A bevel gear is coaxially fixed to one end of the rotating shaft that extends into the mounting shell. A bevel gear is coaxially fixed to the rotating shaft and located in the mounting shell, meshing with two symmetrical bevel gears. An electric motor is fixedly installed on the reaction vessel. A driving bevel gear is coaxially fixed to the output shaft of the electric motor. Both the rotating shaft and the rotating shaft are coaxially fixed to driven bevel gears that mesh with the driving bevel gears.

[0009] The reaction vessel has an inlet at the top that communicates with its interior. A sealing mechanism is installed on the reaction vessel to seal or unseal the inlet. A discharge port is located at the bottom of the reaction vessel and communicates with its interior. A discharge pipe is fixedly installed at the bottom of the reaction vessel, inside the discharge port. A liquid outlet is located on one side of the discharge pipe, and a filter plate is fixedly installed on the discharge pipe, inside the liquid outlet. A discharge port is located on the other side of the discharge pipe, below the liquid outlet. A sealing block is slidably installed inside the discharge pipe, and the sealing block is in contact with the inner wall of the discharge pipe. An adjusting component is installed on the discharge pipe to adjust the sealing block, allowing it to maintain three states within the discharge pipe:

[0010] First state: The top of the blocking block is flush with the top of the discharge pipe;

[0011] Second state: The top of the sealing block is flush with the bottom wall of the drain outlet;

[0012] Third state: The top of the sealing block is flush with the bottom wall of the discharge port.

[0013] Furthermore: the sealing mechanism includes a guide hopper fixedly installed on the top of the reaction vessel and connected to the feed inlet, and a sealing plate hinged to the top of the guide hopper for sealing its top opening.

[0014] Furthermore: the adjusting component includes an adjusting rod that is vertical and threaded through the bottom of the discharge pipe, the top of the adjusting rod being rotatably connected to the bottom of the sealing block.

[0015] Furthermore: a housing is fixedly installed on the top of the base and directly below the adjusting rod. A guide rod moves vertically through the top of the housing, and a contact plate is fixedly installed on the top of the guide rod. A spring is sleeved on the outside of the housing, and the two ends of the spring are connected to the base and the contact plate respectively. When the top of the blocking block is flush with the bottom wall of the drain port, the bottom of the adjusting rod contacts the top of the contact plate. When the top of the blocking block is flush with the bottom wall of the discharge port, the adjusting rod abuts against the contact plate, and the contact plate fits against the top of the housing.

[0016] Furthermore: a liquid guide pipe connected to the liquid outlet is fixedly installed on one side of the discharge pipe, and a material guide pipe connected to the material discharge port is fixedly installed on the other side. Both the liquid guide pipe and the material guide pipe are inclined downwards in the direction away from the discharge pipe.

[0017] Furthermore: A protective shell 1 is fixedly installed on the top of the base and sleeved on the outside of the reaction vessel. One side of the protective shell 1 is open. A protective shell 2 is hinged to the protective shell 1 and sleeved on the outside of the reaction vessel, which seals the opening end of the protective shell 1. The protective shell 1 and the protective shell 2 are fixed together by a buckle. When the protective shell 2 seals the opening end of the protective shell 1, a sealed cavity is formed between the protective shell 2, the protective shell 1 and the base. The reaction vessel is located in the sealed cavity. Both sides of the protective shell 1 are equipped with through holes that communicate with its interior. A filter assembly is installed on the protective shell 1 to seal the through holes. The filter assembly adsorbs and filters the gas discharged from the sealed cavity through the through holes.

[0018] Furthermore: the filter assembly includes a filter shell fixedly installed on the protective shell and connected to the through hole. The top of the filter shell has a slot. An activated carbon adsorption plate for sealing the inside of the filter shell is inserted on the filter shell and inside the slot. The cross-section between the activated carbon adsorption plate and the inner side wall of the slot is in contact. A cover plate for sealing the opening end of the slot is hinged on the filter shell. The cover plate is fixed to the filter shell by a buckle.

[0019] Furthermore, an exhaust fan is fixedly installed inside one of the filter housings.

[0020] This invention provides a melamine-formaldehyde resin synthesis reactor. Compared with the prior art, it has the following advantages:

[0021] 1. After the raw materials have reacted in the reaction tank, the top of the sealing block is flush with the bottom wall of the drain port by adjusting the components. When the reactants in the reaction tank are discharged through the discharge pipe, the filter plate filters the melamine-formaldehyde resin, leaving it in the discharge pipe. The waste liquid passes through the filter holes on the filter plate and is discharged through the drain port, thereby achieving solid-liquid separation of melamine-formaldehyde resin and waste liquid. There is no need for separate solid-liquid separation of melamine-formaldehyde resin and waste liquid, reducing processing steps and making it easier to use.

[0022] 2. By setting up a liquid guide pipe, the waste liquid discharged through the drain outlet is guided; by setting up a material guide pipe, the melamine-formaldehyde resin discharged through the feed outlet is guided. This facilitates the collection of waste liquid discharged through the drain outlet and melamine-formaldehyde resin discharged through the feed outlet by the staff.

[0023] 3. By setting up an exhaust fan, the exhaust fan is controlled to be turned on during the reaction of raw materials in the reaction tank. The operation of the exhaust fan accelerates the air circulation speed between the inside of the sealed cavity and the outside, which is conducive to the discharge of harmful gases from the sealed cavity. By setting up activated carbon adsorption plates to be inserted into the slots, it is easy to install and remove the activated carbon adsorption plates, thus facilitating the replacement of the activated carbon adsorption plates. By setting up a cover plate, the opening end of the slot is sealed. Attached Figure Description

[0024] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0025] Figure 1 A three-dimensional structural schematic diagram of the present invention is shown;

[0026] Figure 2A schematic diagram of the installation structure of the filter assembly of this utility model is shown;

[0027] Figure 3 A schematic diagram of the installation structure of the reaction vessel of this utility model is shown;

[0028] Figure 4 This utility model illustrates Figure 3 Enlarged view of point A in the middle;

[0029] Figure 5 This utility model illustrates Figure 3 Enlarged view of point B in the middle;

[0030] Figure 6 This diagram shows the internal structure of a melamine-formaldehyde resin synthesis reactor in the prior art.

[0031] The diagram shows: 1. Base; 11. Support rod; 12. Reactor; 13. Rotating shaft; 131. Rotating shaft; 132. Bevel gear II; 14. Motor; 15. Driving bevel gear; 16. Driven bevel gear; 17. Feed inlet; 18. Discharge outlet; 2. Mounting shell; 21. Rotating rod; 22. Stirring blade; 23. Bevel gear I; 3. Sealing mechanism; 31. Guide hopper; 32. Sealing plate; 4. Discharge pipe; 41. 42. Drainage port; 43. Filter plate; 44. Feed outlet; 45. Blocking block; 46. Adjusting component; 47. Adjusting rod; 58. Liquid guide tube; 59. Feed guide tube; 50. Housing; 51. Guide rod; 52. Contact plate; 53. Spring; 60. Protective shell one; 61. Through hole; 72. Protective shell two; 83. Filter assembly; 84. Filter shell; 85. Slot; 86. Activated carbon adsorption plate; 87. Cover plate; 9. Exhaust fan. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model are described clearly and completely. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0033] Example 1

[0034] To address the technical problems in the background section, the following melamine-formaldehyde resin synthesis reactor is provided:

[0035] Combination Figures 1-5As shown, the melamine-formaldehyde resin synthesis reactor provided by this utility model includes a base 1. Vertical support rods 11 are fixedly mounted in a rectangular array on the top of the base 1. A reaction vessel 12 is fixedly mounted on the top of the four support rods 11. A vertically oriented rotating shaft 13 is rotatably mounted on the reaction vessel 12. The bottom of the rotating shaft 13 extends into the reaction vessel 12 and is fixedly mounted with a vertically oriented mounting shell 2. Multiple sets of rotating units are linearly arranged vertically on the mounting shell 2. Each rotating unit includes two horizontally oriented rotating rods 21 rotatably mounted on both sides of the mounting shell 2. The ends of the two rotating rods 21 that are close to each other extend into the mounting shell 2 and are far apart. A stirring blade 22 is fixedly installed at one end of the rotating shaft 13. A rotating shaft 131 is rotatably installed on the rotating shaft 13. The rotating shaft 131 and the rotating shaft 13 are located on the same axis, and the bottom end of the rotating shaft 131 extends into the mounting shell 2. A bevel gear 23 is coaxially fixed to one end of the rotating rod 21 that extends into the mounting shell 2. A bevel gear 132 is coaxially fixed to the rotating shaft 131 and located in the mounting shell 2, meshing with two symmetrical bevel gears 23. A motor 14 is fixedly installed on the reaction vessel 12. A driving bevel gear 15 is coaxially fixed to the output shaft of the motor 14. A driven bevel gear 16 meshing with the driving bevel gear 15 is coaxially fixed to both the rotating shaft 13 and the rotating shaft 131.

[0036] The reaction vessel 12 has an inlet 17 at its top, which communicates with the interior of the vessel. A sealing mechanism 3 is installed on the reaction vessel 12, which is used to seal or unseal the inlet 17. The bottom of the reaction vessel 12 has a discharge port 18, which communicates with the interior of the vessel. A discharge pipe 4 is fixedly installed at the bottom of the reaction vessel 12, inside the discharge port 18. A drain port 41 is located on one side of the discharge pipe 4. A filter plate 42 is fixedly installed on the discharge pipe 4, inside the drain port 41. Specifically, the filter plate 42 has… On the side with the largest surface area, the filter plate 42 seals the drain port 41. The side with the largest surface area of ​​the filter plate 42 has several filter holes, all of which communicate with the inside of the discharge pipe 4. On the other side of the discharge pipe 4, below the drain port 41, a discharge port 43 is provided. A sealing block 44 is slidably installed inside the discharge pipe 4, and the sealing block 44 is in contact with the inner wall of the discharge pipe 4. An adjusting element 45 is installed on the discharge pipe 4 to act on the sealing block 44, allowing the sealing block 44 to have three states within the discharge pipe 4:

[0037] First state: The top of the blocking block 44 is flush with the top of the discharge pipe 4;

[0038] Second state: The top of the sealing block 44 is flush with the inner bottom wall of the drain port 41;

[0039] Third state: The top of the sealing block 44 is flush with the inner bottom wall of the discharge port 43.

[0040] In use, the sealing mechanism 3 is removed from the feed inlet 17. The top of the sealing block 44 is aligned with the top of the discharge pipe 4 using the adjusting component 45. Melamine, formaldehyde aqueous solution, and sodium hydroxide catalyst are fed into the reaction tank 12 through the feed inlet 17. The feed inlet 17 is then sealed again by the sealing mechanism 3. The motor 14 is turned on, and the output shaft of the motor 14 rotates, driving the drive bevel gear 15 to rotate. This, in turn, drives the rotating shaft 13 to rotate inside the reaction tank 12 via the two driven bevel gears 16. The rotating shaft 131 rotates on the rotating shaft 13. At this time, the mounting shell 2 rotates around the rotating shaft 13, driving multiple stirring blades 22 to rotate around the rotating shaft 13. When the rotating shaft 131 rotates, it drives the first bevel gear 132 to rotate, which in turn drives the two rotating rods 21 to rotate via the two second bevel gears 23. This causes the stirring blades 22 to rotate around the rotating rods 21, resulting in multiple stirring blades 22 rotating around the rotating shaft 13 and impacting the reaction tank 12. The raw materials are stirred and mixed, and the stirring blade 22 rotates around the rotating rod 21 to further stir and mix the raw materials in the reaction tank 12, improving the mixing effect of the raw materials and facilitating the full mixing of the reactants. After the raw materials in the reaction tank 12 have reacted, the top of the sealing block 44 is aligned with the bottom wall of the drain port 41 by the adjusting component 45. When the reactants in the reaction tank 12 are discharged through the discharge pipe 4, the filter plate 42 filters the melamine-formaldehyde resin, leaving it in the discharge pipe 4. The waste liquid passes through the filter holes on the filter plate 42 and is discharged through the drain port 41, thereby achieving solid-liquid separation of the melamine-formaldehyde resin and the waste liquid. After the waste liquid is discharged, the top of the sealing block 44 is aligned with the bottom wall of the discharge port 43 by the adjusting component 45, and the melamine-formaldehyde resin can be discharged through the discharge port 43. There is no need for additional solid-liquid separation of the melamine-formaldehyde resin and the waste liquid, reducing processing steps and making it easier to use.

[0041] Example 2

[0042] like Figures 1-5 As shown, based on the above embodiments, this embodiment further provides the following:

[0043] In this embodiment, the sealing mechanism 3 includes a guide hopper 31 fixedly installed on the top of the reaction tank 12 and connected to the feed inlet 17. A sealing plate 32 for sealing its top opening is hinged to the top of the guide hopper 31. In use, a force is applied to the sealing plate 32 to make it rotate on the guide hopper 31 to seal the top opening of the guide hopper 31, thereby achieving the sealing effect of the feed inlet 17. Conversely, a force is applied to the sealing plate 32 to unblock the top opening of the guide hopper 31, thereby unblocking the feed inlet 17. The operation is simple, and by setting the guide hopper 31, it is convenient to feed materials into the reaction tank 12.

[0044] In this embodiment, the adjusting member 45 includes an adjusting rod 451 that is vertical and threaded through the bottom of the discharge pipe 4. The top of the adjusting rod 451 is rotatably connected to the bottom of the sealing block 44. In use, the adjusting rod 451 is rotated to make it threadedly displace on the discharge pipe 4. At this time, the adjusting rod 451 rotates with the sealing block 44, so that the sealing block 44 can slide inside the discharge pipe 4. The operation is simple.

[0045] In this embodiment, a housing 5 is fixedly installed on the top of the base 1 and directly below the adjusting rod 451. A guide rod 51 is vertically movably inserted through the top of the housing 5. A contact plate 52 is fixedly installed on the top of the guide rod 51. A spring 53 is sleeved on the outside of the housing 5. The two ends of the spring 53 are connected to the base 1 and the contact plate 52 respectively. When the top of the blocking block 44 is flush with the inner bottom wall of the drain port 41, the bottom of the adjusting rod 451 contacts the top of the contact plate 52. When the top of the blocking block 44 is flush with the inner bottom wall of the discharge port 43, the adjusting rod 451 abuts against the contact plate 52, and the contact plate 52 is in contact with the top of the housing 5. It is worth noting that: the adjusting rod 451 is in contact with the contact plate 52. When the bottom end of rod 451 is in contact with the bottom of discharge pipe 4, the top of sealing block 44 is flush with the top of discharge pipe 4. By setting housing 5, guide rod 51, contact plate 52 and spring 53, when the top of sealing block 44 is flush with the inner bottom wall of discharge port 41, the bottom of adjusting rod 451 contacts the top of contact plate 52. When the top of sealing block 44 is flush with the inner bottom wall of discharge port 43, adjusting rod 451 abuts against contact plate 52, and contact plate 52 is in contact with the top of housing 5. This achieves the effect of adjusting the position of sealing block 44 in discharge pipe 4 by adjusting component 45, which is convenient for operators to adjust the position of sealing block 44 and is beneficial for operators to use.

[0046] Example 3

[0047] like Figures 1-5 As shown, based on the above embodiments, this embodiment further provides the following:

[0048] In this embodiment, a liquid guide pipe 46 connected to the liquid outlet 41 is fixedly installed on one side of the discharge pipe 4, and a material guide pipe 47 connected to the discharge port 43 is fixedly installed on the other side. Both the liquid guide pipe 46 and the material guide pipe 47 are inclined downwards away from the discharge pipe 4. By setting the liquid guide pipe 46, the waste liquid discharged through the liquid outlet 41 is guided. By setting the material guide pipe 47, the melamine-formaldehyde resin discharged through the discharge port 43 is guided. This makes it easier for workers to collect the waste liquid discharged through the liquid outlet 41 and the melamine-formaldehyde resin discharged through the discharge port 43.

[0049] In this embodiment, a protective shell 6, sleeved on the outside of the reaction vessel 12, is fixedly installed on the top of the base 1. One side of the protective shell 6 is open. A second protective shell 7, sleeved on the outside of the reaction vessel 12 and sealing the opening of the protective shell 6, is hinged to the protective shell 6. The protective shell 6 and the second protective shell 7 are fixed together by a snap fastener. When the second protective shell 7 seals the opening of the protective shell 6, a sealed cavity is formed between the second protective shell 7, the protective shell 6, and the base 1. The reaction vessel 12 is located inside the sealed cavity. Both sides of the protective shell 6 have through holes 61 that communicate with its interior. A filter assembly 8 is installed on the protective shell 6 to seal the through holes 61. The filter assembly 8 forms a sealed cavity. Gas is adsorbed and filtered out of the sealed cavity through the through-hole 61. Protective shell 1 (6) and protective shell 2 (7) are installed. During the synthesis of melamine-formaldehyde resin in the reaction vessel 12, the protective shell 1 (6) and protective shell 2 (7) are fixed together by fasteners. The reaction vessel 12 is located inside the sealed cavity. During the reaction of raw materials in the reaction vessel 12, if the gas pressure inside the reaction vessel 12 is too high, harmful gases will be discharged to the outside of the reaction vessel 12 through the inlet 17. When the gas is located inside the sealed cavity and then discharged out through the two through-holes 61, it is adsorbed and filtered by two sets of filter components 8, effectively preventing harmful gases from being directly discharged through the through-holes 61 and causing harm to the workers.

[0050] In this embodiment, the filter assembly 8 includes a filter shell 81 fixedly installed on the protective shell 6 and communicating with the through hole 61. A slot 82 is provided on the top of the filter shell 81. An activated carbon adsorption plate 83 for sealing the interior of the filter shell 81 is inserted into the slot 82 on the filter shell 81. The activated carbon adsorption plate 83 fits snugly against the inner wall of the slot 82. A cover plate 84 is hinged to the filter shell 81 to seal the opening of the slot 82. The cover plate 84 is fixed to the filter shell 81 by a snap fastener. An exhaust fan 9 is fixedly installed inside one of the filter shells 81. During use, when the pressure inside the reaction tank 12 is too high during the raw material reaction, harmful gases are discharged through the feed inlet 17. When the gas reaches the outside of the reaction vessel 12, it is located in the sealed cavity and then discharged outward through the two through holes 61. It passes through the filter shell 81, and during this process, the gas comes into contact with the activated carbon adsorption plate 83, thereby achieving the adsorption and filtration effect of the activated carbon adsorption plate 83 on the harmful gas. By setting the exhaust fan 9, during the reaction of raw materials in the reaction vessel 12, the exhaust fan 9 is controlled to be turned on, thereby accelerating the air circulation speed between the inside of the sealed cavity and the outside, which is conducive to the discharge of harmful gas from the sealed cavity. By setting the activated carbon adsorption plate 83 to be inserted into the slot 82, it is easy to install and remove the activated carbon adsorption plate 83, thereby facilitating the replacement of the activated carbon adsorption plate 83. By setting the cover plate 84, the opening end of the slot 82 is sealed.

[0051] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0052] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A melamine formaldehyde resin synthesis reactor characterized by: The utility model provides a reaction tank, which comprises a base, a plurality of support rods arranged in a vertical direction and fixedly installed on the top of the base in a rectangular array, a reaction tank fixedly installed on the top of the four support rods, a rotating shaft arranged in a vertical direction and rotatably installed on the reaction tank, an installation shell arranged in a vertical direction and fixedly installed on the bottom of the rotating shaft and extending into the reaction tank, a plurality of rotating units arranged in a linear array in a vertical direction and installed on the installation shell, each rotating unit comprising two rotating rods arranged in a horizontal direction and rotatably installed on both sides of the installation shell, each rotating rod extending into the installation shell at one end thereof and away from the installation shell at the other end thereof, a stirring blade fixedly installed on the end of each rotating rod away from the installation shell, a rotating shaft rotatably installed on the rotating shaft and arranged in the same axial direction as the rotating shaft, the bottom end of the rotating shaft extending into the installation shell, a bevel gear one coaxially and fixedly connected to one end of each rotating rod extending into the installation shell, a bevel gear two coaxially and fixedly connected to the rotating shaft and arranged in the installation shell and engaged with the two bevel gears one, an electric motor fixedly installed on the reaction tank, a driving bevel gear coaxially and fixedly connected to the output shaft of the electric motor, and a driven bevel gear engaged with the driving bevel gear and coaxially and fixedly connected to the rotating shaft and the rotating shaft. The top of the reaction tank is provided with a feeding port in communication with the inside of the reaction tank, the reaction tank is provided with a blocking mechanism acting on the feeding port, which is used for blocking or unblocking the feeding port, the bottom of the reaction tank is provided with a discharging port in communication with the inside of the reaction tank, a discharging pipe is fixedly installed on the bottom of the reaction tank and located in the discharging port, a liquid discharging port is formed in one side of the discharging pipe, a filter plate is fixedly installed on the discharging pipe and located in the liquid discharging port, a discharging port is formed in the other side of the discharging pipe and located below the liquid discharging port, a blocking block is slidably installed in the discharging pipe, the cross section between the blocking block and the inner wall of the discharging pipe is in close contact, an adjusting member acting on the blocking block is installed on the discharging pipe, and the blocking block has three states in the discharging pipe through the adjusting member: The first state: the top of the blocking block is flush with the top of the discharging pipe; The second state: the top of the blocking block is flush with the inner bottom wall of the liquid discharging port; The third state: the top of the blocking block is flush with the inner bottom wall of the discharging port.

2. The melamine formaldehyde resin synthesis reactor according to claim 1, characterized in that: The blocking mechanism comprises a guide hopper fixedly installed on the top of the reaction tank and in communication with the feeding port, and a blocking plate hinged to the top of the guide hopper and used for blocking the opening in the top of the guide hopper.

3. The melamine formaldehyde resin synthesis reactor according to claim 1, characterized in that: The adjusting member comprises an adjusting rod arranged in a vertical direction and threaded through the bottom of the discharging pipe, and the top of the adjusting rod is rotatably connected to the bottom of the blocking block.

4. The melamine formaldehyde resin synthesis reactor according to claim 3, characterized in that: The top of the base and below the adjusting rod is fixedly provided with a shell, the top of the shell is movably penetrated by a guide rod arranged in a vertical direction, the top of the guide rod is fixedly provided with a contact plate, the outside of the shell is sleeved with a spring, and the two ends of the spring are respectively connected to the base and the contact plate; when the top of the blocking block is flush with the inner bottom wall of the liquid discharging port, the bottom of the adjusting rod is in contact with the top of the contact plate; when the top of the blocking block is flush with the inner bottom wall of the discharging port, the adjusting rod is in contact with the contact plate, and the contact plate is in close contact with the top of the shell.

5. The melamine formaldehyde resin synthesis reactor according to claim 1, characterized in that: One side of the discharging pipe is fixedly provided with a liquid guide pipe in communication with the liquid discharging port, and the other side of the discharging pipe is fixedly provided with a material guide pipe in communication with the discharging port, and the liquid guide pipe and the material guide pipe are inclined downward away from the discharging pipe.

6. The melamine formaldehyde resin synthesis reactor according to claim 1, characterized in that: The bottom is fixedly installed with a protective shell I sleeved outside the reaction tank, one side of the protective shell I is provided with an opening, the protective shell I is hingedly connected with a protective shell II sleeved outside the reaction tank and sealing the opening end of the protective shell I, the protective shell I and the protective shell II are fixed through buckles, when the protective shell II seals the opening end of the protective shell I, a sealed cavity is formed between the protective shell II, the protective shell I and the bottom, the reaction tank is located in the sealed cavity, both sides of the protective shell I are provided with through holes communicated with the inside of the protective shell I, the protective shell I is provided with a filtering assembly for sealing the through holes, the filtering assembly is used for adsorbing and filtering the gas discharged outside through the through holes in the sealed cavity.

7. The melamine formaldehyde resin synthesis reactor according to claim 6, characterized in that: The filtering assembly comprises a filtering shell fixedly installed on the protective shell I and communicated with the through holes, the top of the filtering shell is provided with a slot, an activated carbon adsorption plate for sealing the inside of the filtering shell is inserted into the slot, the cross section between the activated carbon adsorption plate and the inner side wall of the slot is fitted, a cover plate for sealing the opening end of the slot is hingedly connected to the filtering shell, and the cover plate and the filtering shell are fixed through buckles.

8. The melamine formaldehyde resin synthesis reactor according to claim 7, characterized in that: One of the filtering shells is fixedly installed with an air extractor.

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