Nitrogen replacement device of reaction kettle for producing polyurethane polyol

Abstract

The utility model relates to the technical field of reaction kettles, in particular to a reaction kettle nitrogen replacement device for polyurethane polyol production, which comprises a kettle body, a cover body is fixedly connected to the top surface of the kettle body, an inlet pipe is fixedly connected to the top surface of the cover body, the inside of the inlet pipe is communicated with the inside of the kettle body, and a gas inlet mechanism is arranged in the kettle body. According to the utility model, gas which is newly added into the kettle body is injected through the gas inlet pipe, so that the newly added gas enters the lower part of the piston ring through the plurality of connecting pipes, and the plurality of rubber rings are separated from the adjacent circular through holes by pulling the pull rope, so that the newly added gas below the piston ring extrudes original gas through the circular through holes; the inserting rods are inserted into the inserting holes and abut against the abutting plates so that the rubber rings can be plugged into the adjacent circular through holes, the connecting box is moved through lifting equipment to drive the piston rings to be pushed upwards, original gas is exhausted through the inlet pipe, and therefore the original gas and newly-added gas can be separated through the piston rings, and the original gas is rapidly pushed to be exhausted out of the kettle body.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of reaction kettle, specifically is a kind of polyurethane polyol production is used reaction kettle nitrogen replacement device. BACKGROUND

[0002] When polyurethane polyol production is carried out, raw materials need to be added to the reaction kettle for chemical reaction, but most reactions are relatively sensitive to oxygen or moisture, and in order to meet production needs, the gas in the reaction kettle is generally replaced with inert gas such as nitrogen. Nitrogen has a density close to that of oxygen, and nitrogen itself is one of the main components of air. When nitrogen is directly injected into the reaction kettle, nitrogen is easily mixed with air. When nitrogen is replaced, the air in the reaction kettle is first evacuated, and then nitrogen is introduced for replacement. In the traditional replacement device, the vacuum is not very thorough, resulting in incomplete replacement of nitrogen in the reaction kettle. When nitrogen is introduced, nitrogen is easily mixed with the original residual air, affecting the chemical reaction in the reaction kettle, and resulting in the need to replace multiple times to completely replace the original air in the kettle body, which is inconvenient. SUMMARY

[0003] The utility model aims at providing a kind of polyurethane polyol production is used reaction kettle nitrogen replacement device to solve the problems raised in the above background.

[0004] To achieve the above object, the utility model provides the following technical scheme:

[0005] A kind of polyurethane polyol production is used reaction kettle nitrogen replacement device, including kettle body, and kettle body top is fixedly connected with cover body, the cover body top is fixedly connected with inlet pipe, and inlet pipe inside is communicated with kettle body inside, the kettle body inside is provided with gas inlet mechanism, and gas inlet mechanism is matched with mobile mechanism, the kettle body inside is provided with stirring mechanism;

[0006] The gas inlet mechanism includes piston ring, and piston ring outer side wall is slidably connected with kettle body inner side wall, the stirring mechanism is located in piston ring inside, and multiple connecting pipe openings are formed in the top surface of the piston ring, multiple connecting pipes are fixedly connected in the inside of the connecting pipe openings, and the top ends of the multiple connecting pipes are all penetrated through the top surface of the cover body, a connecting box is arranged above the cover body, and the top ends of the multiple connecting pipes are all fixedly connected with the bottom surface of the connecting box, a gas inlet pipe is fixedly connected on one side of the connecting box, and the inside of the gas inlet pipe, the inside of the connecting box and the inside of the multiple connecting pipes are all communicated.

[0007] Further in, the moving mechanism comprises a plurality of grid plates, a plurality of circular through holes are formed in the top surface of the piston ring, and the plurality of grid plates correspond to the plurality of circular through holes in a one-to-one manner; the outer side walls of the plurality of grid plates are fixedly sleeved at the bottom ends of the inner side walls of the corresponding circular through holes; a vertical column is fixedly connected to the center of the top surface of each of the plurality of grid plates; a rubber ring is slidingly sleeved at the outer side wall of each of the plurality of vertical columns; the plurality of rubber rings are movably connected to the interiors of the adjacent circular through holes; and a rubber block is fixedly connected to the bottom end of each of the plurality of rubber rings.

[0008] Further in, a moving ring is arranged above the piston ring, a plurality of supporting rods are fixedly connected to the outer side wall of the moving ring, the plurality of supporting rods correspond to the plurality of rubber rings in a one-to-one manner, and one end of each of the plurality of supporting rods is fixedly connected to the top surface of the corresponding rubber ring.

[0009] Further in, two through holes are formed in the top surface of the cover body, two pull ropes are fixedly connected to the top surface of the moving ring, and the top ends of the two pull ropes respectively pass through the two through holes.

[0010] Further in, a sealing ring is fixedly sleeved at the inner side wall of each of the two through holes, and the two pull ropes are located in the interiors of the adjacent sealing rings.

[0011] Further in, two insertion holes are formed in the top surface of the cover body, an insertion rod is movably inserted into the interiors of the two insertion holes, a plurality of abutting plates are fixedly connected to the inner side wall of the moving ring, a rubber plug is arranged in each of the two insertion holes in a matched mode, and the rubber plug is movably inserted into the insertion hole.

[0012] Further in, the stirring mechanism comprises a rod body, a motor box is fixedly connected to the bottom surface of the kettle body, a driving motor is arranged in the motor box, the motor shaft of the driving motor passes through the bottom surface of the kettle body and is fixedly connected to the bottom end of the rod body, the rod body is located in the interiors of the moving ring and the piston ring, a circular hole is formed in the top end of the rod body, a plurality of cutting grooves are formed in the outer side wall of the rod body, a communication groove is formed in the inner wall of each of the plurality of cutting grooves, the interiors of the plurality of communication grooves are in communication with the interior of the circular hole, a screw rod is rotatably connected to the bottom end of the circular hole, the top end of the screw rod passes through the top surface of the cover body, a plurality of internally-threaded rings are screwed on the outer side wall of the screw rod, a plurality of stirring rods are arranged on the outer side wall of each of the plurality of internally-threaded rings, the plurality of stirring rods on the outer side wall of the same internally-threaded ring correspond to the plurality of cutting grooves in a one-to-one manner, the top ends of the plurality of stirring rods on the outer side wall of the same internally-threaded ring are rotatably connected between the two opposite inner side walls of the corresponding cutting groove, a connecting rod is rotatably connected to the middle of one side of each of the plurality of stirring rods on the outer side wall of the same internally-threaded ring, and one end of each of the connecting rods is rotatably connected to the outer side wall of the adjacent internally-threaded ring; a protective sleeve is fixedly connected between the bottom surface of the piston ring and the inner bottom surface of the kettle body, the protective sleeve is in a tubular structure, the rod body is located in the interior of the protective sleeve, and each of the connecting rods is located in the interior of the adjacent communication groove.

[0013] Compared with the prior art, the present application has the following advantages:

[0014] By the new gas into the kettle through the gas injection pipe, the new gas enters the piston ring below through the plurality of connecting pipe, at the same time, by pulling the pull rope, the plurality of rubber ring is separated from the adjacent circular through hole, the new gas below the piston ring extrudes the original gas through the circular through hole, then the plug rod is inserted into the plug hole and presses the pressing plate, the plurality of rubber ring is synchronously inserted into the adjacent circular through hole, so that the piston ring below is all new gas, then the connecting box and the plurality of connecting pipe are moved by the hoisting equipment, the piston ring is pushed up, the piston ring separates the new gas and the original gas, the piston ring pushes the original gas to discharge through the inlet pipe, and the new gas below the piston ring is continuously injected through the connecting pipe, after the original gas is discharged from the kettle, the inlet pipe is closed, then the rubber ring is separated from the adjacent circular through hole by pulling the pull rope, and the piston ring is lowered to the original position, so that the piston ring can separate the original gas and the new gas, and the original gas is quickly pushed out of the kettle, so that the original gas in the reaction kettle can be quickly replaced. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is the whole structure schematic diagram of the utility model;

[0016] Figure 2 It is the section structure schematic diagram of the utility model in the gas inlet mechanism, moving mechanism and stirring mechanism;

[0017] Figure 3 It is the position relation schematic diagram of the utility model in the gas inlet mechanism, moving mechanism and stirring mechanism;

[0018] Figure 4 It is the cover structure schematic diagram of the utility model;

[0019] Figure 5 It is the moving mechanism structure explosion drawing of the utility model;

[0020] Figure 6 It is the stirring mechanism structure explosion drawing of the utility model.

[0021] In the figure: 100, kettle body; 110, cover body; 111, through hole; 112, jack; 113, sealing ring; 114, rubber plug; 120, inlet pipe; 130, motor box; 200, air inlet mechanism; 210, piston ring; 211, connecting pipe opening; 212, circular through hole; 220, connecting pipe; 230, connecting box; 231, air inlet pipe; 300, moving mechanism; 310, grid plate; 320, stand; 330, rubber ring; 331, rubber block; 340, moving ring; 341, stop plate; 342, support rod; 343, insertion rod; 350, pull rope; 360, protective sleeve; 400, stirring mechanism; 410, rod body; 411, circular hole; 412, cutting groove; 413, communication groove; 420, screw rod; 430, internal thread ring; 440, stirring rod; 441, connecting rod. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0023] Please refer to Figures 1-6 In the embodiments of the present application, a reaction kettle nitrogen displacement device for polyurethane polyol production includes a kettle body 100, and the kettle body 100 is fixedly connected with a cover body 110 on the top surface, the cover body 110 is fixedly connected with an inlet pipe 120 on the top surface, and the inside of the inlet pipe 120 is connected with the inside of the kettle body 100, an air inlet mechanism 200 is arranged in the kettle body 100, the air inlet mechanism 200 is matched with a moving mechanism 300, and a stirring mechanism 400 is arranged in the kettle body 100.

[0024] The air inlet mechanism 200 includes a piston ring 210, the outer side wall of the piston ring 210 is slidably sleeved with the inner side wall of the kettle body 100, the stirring mechanism 400 is located in the inside of the piston ring 210, a plurality of connecting pipe openings 211 are formed in the top surface of the piston ring 210, a plurality of connecting pipes 220 are fixedly sleeved in the inside of the connecting pipe openings 211, the top ends of the plurality of connecting pipes 220 penetrate through the top surface of the cover body 110, a connecting box 230 is arranged above the cover body 110, the top ends of the plurality of connecting pipes 220 are fixedly connected with the bottom surface of the connecting box 230, an air inlet pipe 231 is fixedly connected on one side of the connecting box 230, and the inside of the air inlet pipe 231, the inside of the connecting box 230 and the inside of the plurality of connecting pipes 220 are connected.

[0025] Specifically, the gas to be injected into the kettle body 100 is injected into the connecting box 230 through the gas inlet pipe 231, and then the gas is injected into the space below the piston ring 210 through the plurality of connecting pipes 220, and most of the original gas in the kettle body 100 is isolated above the piston ring 210 by the piston ring 210, so that the newly injected gas is separated from most of the original gas in the kettle body 100, thereby avoiding the mixing of the newly injected gas and the original gas in the kettle body 100. After the newly injected gas fills the space below the piston ring 210, the user can connect the lifting device to the connecting box 230, so that the lifting device drives the connecting box 230 to move upwards, thereby driving the piston ring 210 to move upwards through the connecting box 230, so as to push the original gas in the kettle body 100 out of the inlet pipe 120, and increase the space below the piston ring 210. Then, after the newly injected gas continues to be injected to fill the increased space below the piston ring 210, the gas replacement in the kettle body 100 is completed, the inlet pipe 120 is closed, and the piston ring 210 is lowered by the lifting device to complete the gas replacement in the kettle body 100. The pipe wall of the connecting pipe 220 is covered with a rubber layer to prevent gas from escaping from the gap between the connecting pipe 220 and the cover 110. If the newly added gas is easily mixed with the gas in the kettle body 100, even if the newly added gas is mixed with the original gas, the mixed gas will be squeezed out of the piston ring 210 by the continuously injected newly added gas. Since the space below the piston ring 210 is limited when the piston ring 210 is not moved, the time required for the original gas and the mixed gas to be squeezed out of the piston ring 210 by the newly added gas is also relatively short.

[0026] Embodiment one

[0027] As shown in Figure 2 and Figure 5 , in this embodiment, the moving mechanism 300 includes a plurality of grid plates 310, the top surface of the piston ring 210 is provided with a plurality of circular holes 212, and the plurality of grid plates 310 correspond one-to-one with the plurality of circular holes 212. The outer side wall of each of the plurality of grid plates 310 is fixedly sleeved to the inner side wall bottom end of the corresponding circular hole 212, and the top surface center of each of the plurality of grid plates 310 is fixedly connected with a vertical column 320. The outer side wall of each of the plurality of vertical columns 320 is slidably sleeved with a rubber ring 330, and each of the plurality of rubber rings 330 is movably connected with the adjacent circular hole 212. The bottom end of each of the plurality of rubber rings 330 is fixedly connected with a rubber block 331.

[0028] In the embodiment, the top of the plurality of columns 320 has a disc-shaped protrusion, and the disc-shaped protrusion of the top of the column 320 is located above the piston ring 210. When the gas is injected into the inside of the piston ring 210 through the connecting box 230 and the plurality of connecting pipes 220, the plurality of rubber rings 330 can be pulled up to make the rubber ring 330 separate from the inside of the adjacent circular through hole 212. Then, when the new gas is injected below the piston ring 210, the gas originally below the piston ring 210 can be squeezed out from the plurality of grid plates 310, so that the gas originally below the piston ring 210 enters above the piston ring 210 through the holes of the grid plate 310. Then, when the piston ring 210 is pulled up by the connecting pipe 220 to make the space below the piston ring 210 larger, the plurality of rubber rings 330 can be pressed first, so that the plurality of rubber rings 330 are clamped into the adjacent circular through hole 212 to close the adjacent circular through hole 212. Thus, the new gas is separated from the gas originally in the kettle body 100, and the piston ring 210 can push the gas above itself to be discharged from the entering pipe 120. After the gas originally in the kettle body 100 is completely discharged, the entering pipe 120 can be closed, and then the plurality of rubber rings 330 are pulled up to open the adjacent circular through hole 212, so that the piston ring 210 no longer separates the gas above and below itself. Then, the hoisting device is started to make the piston ring 210 move downward. The piston ring 210 can naturally move downward due to gravity. The gas below the piston ring 210 can naturally enter above the piston ring 210 through the grid plate 310 and the circular through hole 212, so that the piston ring 210 is not easily blocked when moving. When the rubber ring 330 is clamped into the adjacent circular through hole 212, the rubber block 331 can be counterweighted for the rubber ring 330 to facilitate the clamping of the rubber ring 330 into the adjacent circular through hole 212.

[0029] As shown in Figures 2-5 In the embodiment, the piston ring 210 is provided with a moving ring 340 above, and the moving ring 340 is fixedly connected with a plurality of supporting rods 342 outside the wall. The plurality of supporting rods 342 correspond to the plurality of rubber rings 330 one by one, and one end of the plurality of supporting rods 342 is fixedly connected with the top surface of the corresponding rubber ring 330. The top surface of the cover body 110 is provided with two through holes 111, and the top end of the two pull ropes 350 is respectively inserted into the two through holes 111. The inside wall of the two through holes 111 is fixedly sleeved with a sealing ring 113, and the two pull ropes 350 are located inside the adjacent sealing ring 113. The top surface of the cover body 110 is provided with two insertion holes 112, and the two insertion holes 112 are movably inserted with an insertion rod 343. The inside wall of the moving ring 340 is fixedly connected with a plurality of abutting plates 341. The two insertion holes 112 are provided with a rubber plug 114 in a matched manner, and the rubber plug 114 is movably inserted into the insertion hole 112.

[0030] In practice, by pulling or pushing the moving ring 340, the moving ring 340 can drive the plurality of rubber rings 330 to move synchronously through the plurality of supporting rods 342, so that the plurality of rubber rings 330 can be synchronously clamped into or moved out of the adjacent circular through hole 212. When it is needed to move the plurality of rubber rings 330 out of the adjacent circular through hole 212, the two pull ropes 350 can be pulled to drive the moving ring 340 and the plurality of rubber rings 330 to move upwards. After the kettle body 100 is originally emptied of gas and is filled with new gas, the plurality of circular through holes 212 can always keep unobstructed when the piston ring 210 is controlled to move downwards by the pull rope 350, so that the sealing ring 113 can avoid the gas from escaping from the gap between the pull rope 350 and the through hole 111. When it is needed to move the moving ring 340 to make the plurality of rubber rings 330 clamped into the adjacent circular through hole 212, the inserting rod 343 can be used to push the resisting plate 341 to drive the moving ring 340 and the plurality of rubber rings 330 to move downwards, so that the plurality of rubber rings 330 can be clamped into the adjacent circular through hole 212. After the inserting rod 343 is used, it can be pulled out of the adjacent inserting hole 112, and then the rubber plug 114 can be used to block the inserting hole 112, so that the kettle body 100 can avoid gas leakage.

[0031] Example Two

[0032] On the basis of Example One, the stirring mechanism 400 can be arranged to stir the materials in the kettle body 100.

[0033] As Figure 2 and Figure 6As shown, in the embodiment, the stirring mechanism 400 comprises a rod body 410, the kettle body 100 bottom surface is fixedly connected with the motor box 130, and the motor box 130 is internally provided with a driving motor, the motor shaft of the driving motor penetrates through the kettle body 100 bottom surface and is fixedly connected with the rod body 410 bottom end, the rod body 410 is located inside the moving ring 340 and the piston ring 210, and the rod body 410 top end is provided with a circular hole 411, a plurality of cutting grooves 412 are formed on the outer side wall of the rod body 410, a plurality of communication grooves 413 are formed on the inner wall of the plurality of cutting grooves 412, and the plurality of communication grooves 413 are in communication with the inside of the circular hole 411, the screw rod 420 is rotatably connected with the bottom end of the circular hole 411, and the top end of the screw rod 420 penetrates through the cover body 110 top surface, a plurality of internal thread rings 430 are screwed on the outer side wall of the screw rod 420, a plurality of stirring rods 440 are arranged on the outer side wall of each internal thread ring 430, the plurality of stirring rods 440 on the outer side wall of the same internal thread ring 430 correspond to the plurality of cutting grooves 412, the top end of the plurality of stirring rods 440 on the outer side wall of the same internal thread ring 430 is rotatably connected between the two opposite inner side walls of the corresponding cutting groove 412, the middle part of one side of the plurality of stirring rods 440 on the outer side wall of the same internal thread ring 430 is rotatably connected with the connecting rod 441, and one end of any connecting rod 441 is rotatably connected with the outer side wall of the adjacent internal thread ring 430, the protective sleeve 360 is fixedly connected between the piston ring 210 bottom surface and the kettle body 100 inner bottom surface, the protective sleeve 360 is a tubular structure, the rod body 410 is located inside the protective sleeve 360, and any connecting rod 441 is located inside the adjacent communication groove 413.

[0034] In implementation, the position of any connecting pipe port 211 can be arranged as required, that of any connecting pipe 220 can be arranged as required, and the positions of the two through holes 111 and the two pull ropes 350 can also be arranged as required. When the piston ring 210 moves, the plurality of internally threaded rings 430 can be moved by rotating the screw rod 420, the adjacent connecting rods 441 can be moved by the internally threaded rings 430, the plurality of stirring rods 440 can be retracted into the adjacent cutting grooves 412, so as not to affect the movement of the piston ring 210. The tubular protective sleeve 360 can prevent gas below the piston ring 210 from entering above the piston ring 210. The outer wall of the tubular protective sleeve 360 has a fold. When the piston ring 210 moves upward, the piston ring 210 can pull the protective sleeve 360 to elongate. When the piston ring 210 moves downward, the protective sleeve 360 can naturally contract due to the fold. When the material in the kettle body 100 needs to be stirred, the plurality of internally threaded rings 430 can be moved by rotating the screw rod 420, the plurality of stirring rods 440 can be rotated and extended out of the adjacent cutting grooves 412 by the plurality of internally threaded rings 430 through the adjacent connecting rods 441, and then the driving motor is started to drive the rod body 410 and the plurality of stirring rods 440 to rotate, so that the plurality of stirring rods 440 stir the material in the kettle body 100. The rotation angle of the stirring rod 440 can be adjusted by adjusting the position of the internally threaded ring 430 through the rotation of the screw rod 420. By adjusting the rotation angle of the stirring rod 440 and arranging the positions of the connecting pipe 220 and the pull rope 350 as required, the stirring rod 440 can not contact any pull rope 350 or connecting pipe 220 when rotating.

[0035] It is apparent for those skilled in the art that the present application is not limited to the details of the foregoing exemplary embodiments, and the present application can be implemented in other concrete forms without departing from the spirit or essential characteristics of the present application. Therefore, the embodiments should be considered in all aspects as illustrative and not restrictive, and the scope of the present application is defined by the appended claims rather than the foregoing description, and it is intended to encompass all changes falling within the meaning and range of equivalents of the elements of the claims. Any reference signs in the claims should not be deemed to limit the claims involved.

[0036] In addition, it should be understood that, although the present specification is described in terms of embodiments, not every embodiment contains only one independent technical solution, and the description of the specification is only for the sake of clarity, and those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can be appropriately combined to form other embodiments that those skilled in the art can understand.

Claims

1. A kind of polyurethane polyol production reaction kettle nitrogen replacement device, including kettle body (100), and kettle body (100) top surface is fixedly connected with cover (110), the top surface of cover (110) is fixedly connected with inlet pipe (120), and inlet pipe (120) inside is connected with the inside of kettle body (100), it is characterized in that, The kettle body (100) is internally provided with an air inlet mechanism (200), and the air inlet mechanism (200) is matched with a moving mechanism (300); the kettle body (100) is internally provided with a stirring mechanism (400); The air inlet mechanism (200) comprises a piston ring (210), and the outer side wall of the piston ring (210) is slidably sleeved with the inner side wall of the kettle body (100); the stirring mechanism (400) is located inside the piston ring (210); a plurality of connecting pipe openings (211) are formed in the top surface of the piston ring (210); a plurality of connecting pipes (220) are fixedly sleeved inside the connecting pipe openings (211); the top ends of the connecting pipes (220) penetrate through the top surface of the cover body (110); a connecting box (230) is arranged above the cover body (110); the top ends of the connecting pipes (220) are fixedly connected with the bottom surface of the connecting box (230); an air inlet pipe (231) is fixedly connected to one side of the connecting box (230); the inside of the air inlet pipe (231), the inside of the connecting box (230) and the insides of the connecting pipes (220) are in communication.

2. The reaction kettle nitrogen replacement device for polyurethane polyol production according to claim 1, characterized in that, The moving mechanism (300) comprises a plurality of grating plates (310); a plurality of circular through holes (212) are formed in the top surface of the piston ring (210); the plurality of grating plates (310) correspond to the plurality of circular through holes (212) one by one; the outer side walls of the plurality of grating plates (310) are fixedly sleeved with the inner side wall bottoms of the corresponding circular through holes (212); a vertical column (320) is fixedly connected with the top surface center of each grating plate (310); a rubber ring (330) is slidably sleeved with the outer side wall of each vertical column (320); the rubber ring (330) is movably connected with the inside of the adjacent circular through hole (212); a rubber block (331) is fixedly connected with the bottom end of each rubber ring (330).

3. The reaction kettle nitrogen replacement device for polyurethane polyol production according to claim 2, characterized in that, A moving ring (340) is arranged above the piston ring (210); a plurality of supporting rods (342) are fixedly connected with the outer side wall of the moving ring (340); the plurality of supporting rods (342) correspond to the plurality of rubber rings (330) one by one; one end of each supporting rod (342) is fixedly connected with the top surface of the corresponding rubber ring (330).

4. The reaction kettle nitrogen replacement device for polyurethane polyol production according to claim 3, characterized in that, Two through holes (111) are formed in the top surface of the cover body (110); two pull ropes (350) are fixedly connected with the top surface of the moving ring (340); the top ends of the two pull ropes (350) penetrate through the two through holes (111) respectively.

5. The reaction kettle nitrogen replacement device for polyurethane polyol production according to claim 4, characterized in that, A sealing ring (113) is fixedly sleeved with the inner side wall of each through hole (111); the two pull ropes (350) are located inside the adjacent sealing rings (113).

6. The reaction kettle nitrogen replacement device for polyurethane polyol production according to claim 5, characterized in that, Two insertion holes (112) are formed in the top surface of the cover body (110); an insertion rod (343) is movably inserted into each insertion hole (112); a plurality of abutting plates (341) are fixedly connected with the inner side wall of the moving ring (340); a rubber plug (114) is matched with each insertion hole (112); the rubber plug (114) is movably inserted into the insertion hole (112).

7. The reaction kettle nitrogen replacement device for polyurethane polyol production according to claim 6, characterized in that, The stirring mechanism (400) includes a rod body (410), the kettle body (100) bottom surface fixedly connected with motor box (130), and motor box (130) inside is provided with driving motor, the motor shaft of driving motor penetrates kettle body (100) bottom surface and is fixedly connected with the bottom end of rod body (410), the rod body (410) is located in moving ring (340) and piston ring (210) inside, and the top end of rod body (410) is provided with circular hole (411), a plurality of cutting grooves (412) are set up on the outer wall of rod body (410), a plurality of cutting grooves (412) one inner wall are provided with the communicating groove (413), and a plurality of communicating grooves (413) are connected with the inside of circular hole (411) in the inside, the bottom end of circular hole (411) is rotatably connected with screw rod (420), and the top end of screw rod (420) penetrates the top surface of cover body (110), a plurality of internal threads rings (430) are screwed on the outer side wall of screw rod (420), and a plurality of stirring rods (440) are arranged on the outer side wall of a plurality of internal threads rings (430), the plurality of stirring rods (440) of the same internal threads ring (430) outer side wall are one-to-one corresponding with a plurality of cutting grooves (412), and the plurality of stirring rods (440) of the same internal threads ring (430) outer side wall are rotatably connected between the two opposite inner side walls of the corresponding cutting groove (412) in the top end, the plurality of stirring rods (440) of the same internal threads ring (430) outer side wall are rotatably connected with the connecting rod (441) in the middle of one side, either connecting rod (441) one end is rotatably connected with the outer side wall of adjacent internal threads ring (430), the bottom surface of piston ring (210) and kettle body (100) inner bottom surface are fixedly connected with the protective sleeve (360), and the protective sleeve (360) is tubular structure, the rod body (410) is located in the protective sleeve (360), and any connecting rod (441) is located in the adjacent communicating groove (413) inside.

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