Continuous preparation equipment based on triethyl phosphate flame retardant

Abstract

The present invention discloses a continuous preparation device based on triethyl phosphate flame retardant, including a reaction kettle. The reaction kettle includes a feed pipe and a discharge pipe that can be opened or closed, and also includes a heating part arranged inside. It further includes: an intermediate pipe fixed to the top of the reaction kettle, and the intermediate pipe is communicated with the inside of the reaction kettle. Two ventilation pipes are communicated with the side wall of the intermediate pipe, and the two ventilation pipes are respectively connected with an air extractor for extracting the air in the reaction kettle and a blower for filling inert gas into the reaction kettle; it also includes a switch assembly, and the switch assembly is used to switch to make one of the ventilation pipes communicate with the intermediate pipe. By extracting the air in the reaction kettle and filling it with inert gas, the present invention can minimize the oxygen content in the reaction kettle to the greatest extent, and at the same time, it can also extract the moisture in the internal air, further reducing the occurrence of oxidation reaction, thereby ensuring the quality and purity of the product.

Description

Technical Field

[0001] The present invention relates to the technical field of triethyl phosphate preparation, and specifically to a continuous preparation device based on triethyl phosphate flame retardant. Background Art

[0002] The technology of triethyl phosphate flame retardant is to endow non-flammable materials with flame retardant properties, and extinguish the burning objects under certain conditions. It is a safe fireproof material. During the preparation of triethyl phosphate flame retardant, triethyl phosphate and flame retardant raw materials are added to a reaction kettle, and then obtained through heating and reaction.

[0003] Currently, during the preparation process, in order to reduce impurities and impure substances in the reaction products, inert gas is usually added to the reaction kettle while heating the reaction, so as to reduce the oxygen content inside the reaction kettle, reduce the occurrence of oxidation reaction, and thus ensure the quality and purity of the products.

[0004] However, although adding inert gas to the reaction kettle reduces the internal oxygen content, there is still oxygen and moisture in the air inside the reaction kettle. Therefore, although the method of directly introducing inert gas can reduce the occurrence of oxidation reaction, it still has a certain impact on the quality and purity of the products. Summary of the Invention

[0005] The purpose of the present invention is to provide a continuous preparation device based on triethyl phosphate flame retardant to solve at least one of the technical problems existing in the above-mentioned prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solution: A continuous preparation device based on triethyl phosphate flame retardant, including a reaction kettle, the reaction kettle includes a feed pipe and a discharge pipe that can be opened or closed, and further includes a heating part arranged inside, and further includes: an intermediate pipe fixed on the top of the reaction kettle, and the intermediate pipe is communicated with the inside of the reaction kettle. Two ventilation pipes are communicated with the side wall of the intermediate pipe, and the two ventilation pipes are respectively connected to an air extractor for extracting air inside the reaction kettle and a blower for filling inert gas into the reaction kettle;

[0007] It further includes a switch assembly, and the switch assembly is used to switch so that one of the ventilation pipes is communicated with the intermediate pipe.

[0008] Preferably, the switch assembly includes two circular shells respectively arranged on the two ventilation pipes. Cavities are respectively opened inside the two circular shells, and round blocks are rotatably installed inside the two cavities. Ventilation channels are respectively arranged along the diameter direction inside the two round blocks;

[0009] The switch assembly further includes a driving assembly for driving the two round blocks to rotate.

[0010] Preferably, the driving assembly includes two gears, and the two gears are respectively coaxially and fixedly connected to two round blocks. A fixed plate is fixed to the top of the intermediate pipe. First and second racks are respectively vertically and slidably mounted on the outer walls on both sides of the fixed plate. The first and second racks are respectively engaged with the adjacent gears, and the air pipe near the first rack is connected to an air extractor;

[0011] The driving assembly further includes a driving part for driving the first and second racks to move downward. After the driving part drives the second rack to move downward first and makes the air passage in the corresponding round block communicate with the air pipe, the first rack moves downward.

[0012] Preferably, the driving part includes an elastic telescopic rod rotatably mounted on the outer wall of the fixed plate, and the telescopic end of the elastic telescopic rod is rotatably connected to the side wall of the first rack. A tension spring is rotatably connected between the outer wall of the elastic telescopic rod and the outer wall of the second rack;

[0013] The driving part further includes two shaft seats fixed on the upper and lower sides of the fixed plate, and a rotatable screw rod is installed between the two shaft seats. The screw rod penetrates through the second rack and is threadedly connected to the penetration part of the second rack.

[0014] Preferably, the driving assembly includes two servo motors mounted on the outer wall of a circular shell. The output shafts of the two servo motors are respectively coaxially and fixedly connected to two round blocks. A hole for the output shaft of the servo motor to pass through is opened on the outer wall of the circular shell, and the two servo motors are connected to an external control part.

[0015] Preferably, a lifting plate and a sliding plate are successively slidably mounted on the inner wall of the intermediate pipe from top to bottom. A spring is connected between the lifting plate and the sliding plate. A through air hole is opened in the sliding plate, and a one-way valve for allowing air to flow unidirectionally into the reaction kettle is installed in the air hole;

[0016] A telescopic cylinder is further installed on the outer wall of the fixed plate, and the output end of the telescopic cylinder is fixedly connected to the lifting plate. A trigger switch electrically connected to the telescopic cylinder is installed on the outer wall of the shaft seat below the second rack. When the second rack moves to the lower side, it will touch the trigger switch, and the trigger switch controls the output end of the telescopic cylinder to extend downward. In the initial state, the sliding plate is located above the connection between the air pipe and the intermediate pipe.

[0017] Preferably, a limiting slide bar is fixed to the outer wall of the lifting plate, and a through hole for the limiting slide bar to pass through is opened in the sliding plate. A protrusion is provided at one end of the limiting slide bar passing through the through hole, and the diameter of the protrusion is larger than the diameter of the through hole.

[0018] Preferably, the thickness of the sliding plate is greater than the inner diameter of the connection between the air pipe and the intermediate pipe.

[0019] Preferably, the inner diameter of the ventilation duct is greater than or equal to the inner diameter of the ventilation pipe.

[0020] Preferably, a stirring assembly is further installed inside the reaction kettle. The stirring assembly includes a rotating block that is installed at the bottom inside the reaction kettle through a rotating shaft and can rotate. A stirring shaft is rotatably installed on the outer wall of the rotating block. A plurality of stirring fan blades are fixed on the outer wall of the stirring shaft. A fixed bevel gear is fixed at the bottom inside the reaction kettle, and a first bevel gear meshing with the fixed bevel gear is fixed on the outer wall of the stirring shaft.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] By pumping out the air in the reaction kettle and filling it with inert gas, the present invention can minimize the oxygen content in the reaction kettle to the greatest extent. At the same time, the moisture in the air inside it can also be pumped out, further reducing the occurrence of oxidation reactions, and thus ensuring the quality and purity of the product. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is the front view of the present invention;

[0024] Figure 2 is the front perspective view of the present invention;

[0025] Figure 3 is the rear perspective view of the present invention;

[0026] Figure 4 is the right view of the present invention;

[0027] Figure 5 is the present invention Figure 4 sectional view along A-A in;

[0028] Figure 6 is the present invention Figure 4 sectional view along B-B in;

[0029] Figure 7 is the present invention Figure 6 sectional perspective view from the perspective of;

[0030] Figure 8 is the overall flow block diagram of the present invention;

[0031] Figure 9 is the structural schematic diagram of the second embodiment of the driving assembly of the present invention.

[0032] In the figure: 1, reaction kettle; 2, feed pipe; 3, discharge pipe; 4, intermediate pipe; 5, ventilation pipe; 6, circular shell; 7, round block; 8, ventilation passage; 9, fixed plate; 10, gear; 11, first rack; 12, second rack; 13, elastic telescopic rod; 14, tension spring; 15, shaft seat; 16, screw; 17, lifting plate; 18, telescopic cylinder; 19, sliding plate; 20, ventilation hole; 21, one-way valve; 22, spring; 23, limiting slide bar; 24, fixed bevel gear; 25, rotating block; 26, stirring shaft; 27, first bevel gear; 28, stirring fan blade; 29, trigger switch; 30, servo motor. Embodiment

[0033] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts shall fall within the protection scope of the present invention.

[0034] Embodiment 1 of the present invention;

[0035] Please refer to Figures 1 to 8 , the present invention provides a technical solution: a continuous preparation device based on a triethyl phosphate flame retardant, including a reaction kettle 1. The reaction kettle 1 includes a feed pipe 2 and a discharge pipe 3 that can be opened or closed, and also includes a heating part arranged inside. It further includes: an intermediate pipe 4 fixed on the top of the reaction kettle 1, and the intermediate pipe 4 is communicated with the inside of the reaction kettle 1. Two ventilation pipes 5 are communicated with the side wall of the intermediate pipe 4, and the two ventilation pipes 5 are respectively connected to an air extractor for extracting the air in the reaction kettle 1 and a blower for filling the reaction kettle 1 with inert gas;

[0036] It further includes a switch assembly, and the switch assembly is used to switch to make one of the ventilation pipes 5 communicate with the intermediate pipe 4.

[0037] When the preparation device is in use, triethyl phosphate, a flame retardant raw material, and a catalyst are put into the reaction kettle 1 through the feed pipe 2, and then the feed pipe 2 is closed. Then, the switch assembly is used to open the ventilation pipe 5 connected to the air extractor, and the other ventilation pipe 5 is closed. The air in the reaction kettle 1 is extracted by the air extractor to make the inside of the reaction kettle 1 in an approximately vacuum state. After the air extraction is completed, the switch assembly switches the two ventilation pipes 5, and the ventilation pipe 5 connected to the blower is communicated, and inert gas is filled into the reaction kettle 1 until the inside of the reaction kettle 1 is at normal pressure or slightly higher than the standard air pressure;

[0038] Then, it is heated through the heating part in the reaction kettle 1 to make the triethyl phosphate and the flame retardant raw material inside react, thereby preparing the triethyl phosphate flame retardant;

[0039] In this way, by extracting the air in the reactor 1 and filling it with inert gas, the oxygen content in the reactor 1 can be minimized to the greatest extent. At the same time, the moisture in the air inside it can also be extracted, further reducing the occurrence of oxidation reaction, thereby ensuring the quality and purity of the product.

[0040] In one of the more preferred embodiments, the switch assembly includes two circular shells 6 respectively provided on two ventilation pipes 5, each of the two circular shells 6 has a cavity formed therein, and a round block 7 is rotatably mounted in each of the two cavities, and each of the two round blocks 7 has a ventilation channel 8 formed therein along the diameter direction.

[0041] The switch assembly further comprises a driving assembly for driving the two round blocks 7 to rotate.

[0042] Switch components can be found in Figure 5 The two round blocks 7 are driven to rotate by the driving assembly so that the air passage 8 inside them is connected to or staggered with the vent pipe 5, thereby achieving the connection or closure of the vent pipe 5.

[0043] In one of the more preferred embodiments, the drive assembly includes two gears 10, and the two gears 10 are coaxially fixedly connected to the two round blocks 7 respectively. A fixed plate 9 is fixed to the top of the intermediate tube 4. A first rack 11 and a second rack 12 are vertically slidably mounted on the outer walls of both sides of the fixed plate 9. The first rack 11 and the second rack 12 are respectively meshed with adjacent gears 10, and the ventilation pipe 5 near the first rack 11 is connected to the exhaust pump;

[0044] The driving assembly also includes a driving part for driving the first rack 11 and the second rack 12 to move downward, and the driving part drives the second rack 12 to move downward first and connect the air passage 8 in the corresponding round block 7 with the air pipe 5 before the first rack 11 moves downward.

[0045] When using the drive assembly, please refer to Figures 5 - 7 In the initial state, the first rack 11 and the second rack 12 are both in the upper position. At this time, the air duct 8 in the round block 7 on the left is in a vertical state, and the air duct 5 there is connected. The air duct 8 in the round block 7 on the right is in a horizontal state, and the air duct 5 there is blocked and closed. At this time, the vacuum pump is pumping air.

[0046] After the air is exhausted, when it is necessary to switch the two ventilation pipes 5, the first rack 11 and the second rack 12 are driven downward by the driving part, and then the first rack 11 and the second rack 12 will drive the gear 10 meshing therewith to rotate, thereby rotating the two round blocks 7 and changing the state of the ventilation channel 8 inside thereof, closing the ventilation pipe 5 connected to the exhaust fan and connecting the ventilation pipe 5 connected to the inflator, so that the inflator can be filled with inert gas, completing the process of switching between exhaust and inflation.

[0047] In one of the more preferred embodiments, the driving part includes an elastic telescopic rod 13 rotatably mounted on the outer wall of the fixed plate 9, and the telescopic end of the elastic telescopic rod 13 is rotatably connected to the side wall of the first rack 11. A tension spring 14 is rotatably connected between the outer wall of the elastic telescopic rod 13 and the outer wall of the second rack 12;

[0048] The driving part further includes two shaft seats 15 fixed on the upper and lower sides of the fixed plate 9, and a rotatable screw rod 16 is installed between the two shaft seats 15. The screw rod 16 penetrates through the second rack 12 and is threadedly connected to the penetration part of the second rack 12.

[0049] When the driving part is in use, through an external structure such as a motor, the screw rod 16 is driven to rotate. Through the threaded cooperation, the second rack 12 is driven to move downward, thereby driving the round block 7 cooperating with it to rotate, and at the same time connecting the ventilation pipe 5 at this place;

[0050] During the downward movement of the second rack 12, the tension spring 14 will be first pulled to rotate at its connection with the elastic telescopic rod 13 until the tension spring 14 passes over the connection between the elastic telescopic rod 13 and the fixed plate 9. At this time, the tension spring 14 will exert a downward component force on the first rack 11, thereby driving the first rack 11 to move downward, thereby driving the round block 7 cooperating with it to rotate and closing the ventilation pipe 5 at this place;

[0051] In this way, through the arrangement of the elastic telescopic rod 13 and the tension spring 14, the two racks will have a sequential downward movement order, that is, the second rack 12 moves downward first, and then the first rack 11 moves downward later. The purpose is to first connect the ventilation pipe 5 connected to the inflator, and at this time the ventilation pipe 5 connected to the air extractor is not closed yet. There will be a period when the two ventilation pipes 5 are both connected at the same time. In this way, while the air extractor is pumping air, the inflator will fill the inert gas. That is, the air extractor will extract a part of the inert gas. In this way, all the residual oxygen in the two ventilation pipes 5 can be extracted, further reducing the influence of the residual oxygen content in the ventilation pipe 5 on the reaction in the reaction kettle 1 and further ensuring the quality and purity of the product;

[0052] Then, as the first rack 11 moves downward, the corresponding round block 7 rotates to close the ventilation pipe 5, completing the switching process, and then the inflator fills the inert gas into the reaction kettle 1.

[0053] Embodiment 2 of the present invention is basically the same as Embodiment 1, except that a second implementation manner of the driving component is provided. For details, please refer to Figure 9 ;

[0054] In one relatively preferred embodiment, the driving assembly includes two servo motors 30 mounted on the outer wall of the circular shell 6. The output shafts of the two servo motors 30 are respectively and coaxially fixedly connected to two round blocks 7. The outer wall of the circular shell 6 is provided with holes for the output shafts of the servo motors 30 to pass through, and the two servo motors 30 are connected to an external control unit.

[0055] The rotation of the two round blocks 7 can be directly controlled by the servo motors 30. They can be rotated simultaneously to switch the connection of the two ventilation pipes 5, or the two round blocks 7 can be rotated by a sequential control order, and the same effect as in the first embodiment above can also be achieved.

[0056] In one relatively preferred embodiment, a lifting plate 17 and a sliding plate 19 are sequentially and slidably mounted on the inner wall of the intermediate pipe 4 from top to bottom. A spring 22 is connected between the lifting plate 17 and the sliding plate 19. A through ventilation hole 20 is provided inside the sliding plate 19, and a one-way valve 21 that allows air to flow unidirectionally into the reaction kettle 1 is installed inside the ventilation hole 20;

[0057] An expansion cylinder 18 is further installed on the outer wall of the fixed plate 9, and the output end of the expansion cylinder 18 is fixedly connected to the lifting plate 17. A trigger switch 29 electrically connected to the expansion cylinder 18 is installed on the outer wall of the shaft seat 15 below the second rack 12. When the second rack 12 moves downward, it will touch the trigger switch 29, and the trigger switch 29 controls the output end of the expansion cylinder 18 to extend downward. In the initial state, the sliding plate 19 is located above the connection between the ventilation pipe 5 and the intermediate pipe 4.

[0058] As can be seen from the above, when the second rack 12 moves downward first, the ventilation pipe 5 connected to the inflator will be connected. At the same time, when the second rack 12 moves downward, it will touch the trigger switch 29, and then the trigger switch 29 controls the output end of the expansion cylinder 18 to extend downward, thereby driving the lifting plate 17 to move downward. And under the connection action of the spring 22, the sliding plate 19 will also move downward accordingly, and the sliding plate 19 will move downward to below the connection between the ventilation pipe 5 and the intermediate pipe 4. Then, when the inflator fills the ventilation pipe 5 with inert gas, the inert gas will be filled into the reaction kettle 1 through the ventilation hole 20 to complete the inflation process;

[0059] Then, as the inert gas is filled into the reaction kettle 1, the internal air pressure will gradually return to the standard atmospheric pressure. Then, as the air pressure increases, the internal air pressure will push the sliding plate 19 upward and compress the spring 22. At this time, as the sliding plate 19 moves upward, the connection between the ventilation pipe 5 and the intermediate pipe 4 will be closed, thereby closing the ventilation pipe 5 and stopping further inflation;

[0060] Then, during the heating process in the reaction kettle 1, the air pressure inside the reaction kettle 1 will increase with heating. Since the air pressure in the reaction kettle 1 will affect the reaction rate, generally speaking, the higher the air pressure, the faster the reaction rate. Because under high pressure, the molecular density of the reactants increases, the collision chance increases, and the reaction rate also increases accordingly. However, considering that if the air pressure in the reaction kettle 1 is too high, it will increase the equipment cost and safety risks. Therefore, the air pressure in the reaction kettle 1 needs to be maintained at a certain pressure. So when the air pressure in the reaction kettle 1 increases, the internal air pressure will push the slide plate 19 upward and overcome the elastic force of the spring 22. As the slide plate 19 moves upward, the space inside the reaction kettle 1 increases accordingly, so the internal air pressure will decrease accordingly. In this way, by sliding the slide plate 19 up and down, the air pressure inside the reaction kettle 1 can be adjusted, so that the air pressure inside the reaction kettle 1 is maintained at an atmospheric pressure or slightly higher than the atmospheric pressure, preferably 0.1 - 0.5 MPa. In this way, both the internal reaction rate can be ensured, and at the same time, the equipment cost and safety risks caused by excessive internal pressure can be avoided.

[0061] In one relatively preferred embodiment, a limiting slide rod 23 is fixed to the outer wall of the lifting plate 17, and a through hole for the limiting slide rod 23 to pass through is formed inside the slide plate 19. A protrusion is provided at one end of the limiting slide rod 23 passing through the through hole, and the diameter of the protrusion is larger than the diameter of the through hole.

[0062] It can be seen Figure 7 , due to the protrusion on the limiting slide rod 23, relative sliding can occur between the slide plate 19 and the limiting slide rod 23, and at the same time, the slide plate 19 can be limited;

[0063] It should be noted that since negative pressure will be generated inside the reaction kettle 1 during the air extraction process by the air extractor, the limiting of the limiting slide rod 23 can prevent the slide plate 19 from moving downward to block the ventilation pipe 5, thus ensuring that the ventilation pipe 5 remains in a connected state.

[0064] In one relatively preferred embodiment, the thickness of the slide plate 19 is greater than the inner diameter of the connection between the ventilation pipe 5 and the middle pipe 4.

[0065] In one relatively preferred embodiment, the inner diameter of the ventilation passage 8 is greater than or equal to the inner diameter of the ventilation pipe 5.

[0066] In one relatively preferred embodiment, a stirring assembly is further installed inside the reaction kettle 1. The stirring assembly includes a rotating block 25 that is installed at the bottom inside the reaction kettle 1 through a rotating shaft and can rotate. A stirring shaft 26 is rotatably installed on the outer wall of the rotating block 25. A plurality of stirring fan blades 28 are fixed to the outer wall of the stirring shaft 26. A fixed bevel gear 24 is fixed to the bottom inside the reaction kettle 1, and a first bevel gear 27 that meshes with the fixed bevel gear 24 is fixed to the outer wall of the stirring shaft 26.

[0067] By setting up the stirring component, the raw materials inside the reaction kettle 1 can be stirred, so that the heating of the raw materials is more uniform, and then the stability of the product quality is improved;

[0068] During operation, the rotating block 25 is driven to rotate by an external mechanism. Then, when the rotating block 25 rotates, it drives the stirring shaft 26 to rotate. At the same time, the stirring shaft 26 rotates along the first bevel gear 27 through the fixed bevel gear 24. Thus, the stirring shaft 26 rotates while also revolving, and further, the stirring blades 28 revolve while rotating, making the stirring effect better and further making the heating of the raw materials more uniform.

[0069] The standard parts used in this embodiment can be directly purchased from the market. For the non-standard structural components described in the specification and drawings, they can also be directly processed without any doubt according to the existing common technical knowledge. At the same time, the connection methods of each component adopt the mature conventional means in the existing technology, and the machinery, parts and equipment all adopt the conventional models in the existing technology. Therefore, no specific description will be made here.

[0070] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principle and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Continuous preparation equipment based on triethyl phosphate flame retardant, including a reaction kettle (1), the reaction kettle (1) includes a feed pipe (2) and a discharge pipe (3) that can be opened or closed, and also includes a heating part arranged inside, characterized in that, It further includes: An intermediate pipe (4) fixed to the top of the reaction kettle (1), and the intermediate pipe (4) is communicated with the inside of the reaction kettle (1). Two air pipes (5) are communicated with the side wall of the intermediate pipe (4), and the two air pipes (5) are respectively connected to an air extractor for extracting air in the reaction kettle (1) and a blower for filling inert gas into the reaction kettle (1); It further includes a switch assembly, and the switch assembly is used to switch to make one of the air pipes (5) communicate with the intermediate pipe (4); The switch assembly includes two circular shells (6) respectively arranged on the two air pipes (5). Cavities are respectively opened inside the two circular shells (6), and round blocks (7) are rotatably installed in the two cavities. Air channels (8) are respectively opened in the two round blocks (7) along the diameter direction; The switch assembly further includes a driving assembly for driving the two round blocks (7) to rotate; The inner diameter of the air channel (8) is greater than or equal to the inner diameter of the air pipe (5); The driving assembly includes two gears (10), and the two gears (10) are respectively coaxially and fixedly connected to the two round blocks (7). A fixing plate (9) is fixed to the top of the intermediate pipe (4). A first rack (11) and a second rack (12) are respectively vertically slidably installed on the outer walls on both sides of the fixing plate (9). The first rack (11) and the second rack (12) are respectively engaged with the adjacent gears (10), and the air pipe (5) close to the first rack (11) is connected to the air extractor; The driving assembly further includes a driving part for driving the first rack (11) and the second rack (12) to move downward. After the driving part drives the second rack (12) to move downward first and makes the air channel (8) in the corresponding round block (7) communicate with the air pipe (5), the first rack (11) then moves downward; The driving part includes an elastic telescopic rod (13) rotatably installed on the outer wall of the fixing plate (9), and the telescopic end of the elastic telescopic rod (13) is rotatably connected to the side wall of the first rack (11). A tension spring (14) is rotatably connected between the outer wall of the elastic telescopic rod (13) and the outer wall of the second rack (12); The driving part further includes two shaft seats (15) fixed on the upper and lower sides of the fixing plate (9), and a rotatable screw rod (16) is installed between the two shaft seats (15). The screw rod (16) penetrates through the second rack (12) and is threadedly connected to the penetration part of the second rack (12); 2. The continuous preparation device based on triethyl phosphate flame retardant according to claim 1, characterized in that: A lifting plate (17) and a sliding plate (19) are sequentially slidably installed on the inner wall of the intermediate pipe (4) from top to bottom. A spring (22) is connected between the lifting plate (17) and the sliding plate (19). A through air hole (20) is opened inside the sliding plate (19), and a one-way valve (21) that can make air flow unidirectionally into the reaction kettle (1) is installed inside the air hole (20); An expansion cylinder (18) is also installed on the outer wall of the fixed plate (9), and the output end of the expansion cylinder (18) is fixedly connected to the lifting plate (17). A trigger switch (29) electrically connected to the expansion cylinder (18) is installed on the outer wall of the shaft seat (15) located below the second rack (12). When the second rack (12) moves downward, it will touch the trigger switch (29), and the trigger switch (29) controls the output end of the expansion cylinder (18) to extend downward. In the initial state, the sliding plate (19) is located above the connection between the ventilation pipe (5) and the intermediate pipe (4).

3. The continuous preparation equipment based on triethyl phosphate flame retardant according to claim 2, characterized in that: A limiting slide bar (23) is fixed on the outer wall of the lifting plate (17), and a through hole for the limiting slide bar (23) to pass through is formed in the sliding plate (19). A protrusion is provided at one end of the limiting slide bar (23) passing through the through hole, and the diameter of the protrusion is larger than the diameter of the through hole.

4. The continuous preparation device based on triethyl phosphate flame retardant according to claim 2, characterized in that: The thickness of the sliding plate (19) is greater than the inner diameter of the connection between the ventilation pipe (5) and the intermediate pipe (4).

5. The continuous preparation equipment based on triethyl phosphate flame retardant according to claim 1, characterized in that: A stirring assembly is also installed inside the reaction kettle (1). The stirring assembly includes a rotating block (25) rotatably installed on the inner bottom of the reaction kettle (1) through a rotating shaft. A stirring shaft (26) is rotatably installed on the outer wall of the rotating block (25). A plurality of stirring fan blades (28) are fixed on the outer wall of the stirring shaft (26). A fixed bevel gear (24) is fixed on the inner bottom of the reaction kettle (1), and a first bevel gear (27) meshing with the fixed bevel gear (24) is fixed on the outer wall of the stirring shaft (26).

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