Polyurethane production equipment

Abstract

The utility model discloses polyurethane production equipment which is characterized in that a first spiral constant-temperature pipe and a second spiral constant-temperature pipe are arranged in a mixing drum, the first spiral constant-temperature pipe and the second spiral constant-temperature pipe are arranged at intervals along the vertical direction, the lower end parts of the first spiral constant-temperature pipe and the second spiral constant-temperature pipe are communicated, and an outer constant-temperature spiral pipe is wound on the outer wall of a tank body; the two ends of the outer constant-temperature spiral pipe, the upper end of the first spiral constant-temperature pipe and the upper end of the second spiral constant-temperature pipe are connected with the cold and hot water circulation machine. Polyurethane is heated or cooled from the inside of the reaction kettle through the first spiral constant-temperature pipe and the second spiral constant-temperature pipe, meanwhile, polyurethane is heated or cooled from the outside of the reaction kettle through the outer constant-temperature spiral pipe, heating and cooling are conducted inside and outside at the same time, the heating and cooling speed is increased, heating and cooling of polyurethane are more uniform, temperature difference does not exist, and the service life of polyurethane is prolonged. And the product quality of polyurethane is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of polyurethane production equipment, in particular to polyurethane production equipment. Background Art

[0002] Polyurethane is the abbreviation of polyurethane, and its English name is polyurethane. It is a kind of polymer material. Polyurethane is an emerging organic polymer material, known as the "fifth plastic". It is widely used in many fields of the national economy due to its excellent performance. The product application fields involve light industry, chemical industry, electronics, textiles, medical treatment, construction, building materials, automobiles, national defense, aerospace, aviation, etc.

[0003] The production process of polyurethane has strict requirements on environmental conditions, the most critical of which is constant temperature. During the initial reaction of polyurethane, it needs to be stirred by a stirring mechanism, and it also needs to be heated by a heating mechanism to reach the optimal reaction temperature; however, as the polyurethane continues to react, it will also generate heat during the reaction, and at this time the heating mechanism needs to be shut down to cool it down. The traditional cooling method is natural heat dissipation, but due to the slow speed of natural heat dissipation, the polyurethane cannot be maintained at the optimal reaction temperature. A small part of the cooling method is to wrap a water pipe around the periphery of the reaction device, and inject circulating cold water or hot water into the water pipe for cooling and heating, so that the polyurethane can maintain the optimal reaction temperature throughout the process. This external heating and cooling method requires the outer wall of the reaction device as a medium for heat transfer. The heat transfer speed is slow, resulting in slow heating and heat dissipation. The polyurethane cannot be maintained at the optimal reaction temperature in the initial stage of heating and heat dissipation, causing the linear molecular chains of the polyurethane to branch and cross-link, affecting the regularity between the molecules; and because the diameter of the reaction device is large, the speed at which heat diffuses to the middle or the middle heat diffuses to the periphery is slow, resulting in a large temperature difference between the polyurethane located in the middle of the reaction device and the polyurethane close to the inner wall of the reaction device. Not only is the heating and cooling speed slow, but the heating and heat dissipation are also uneven. Therefore, it is necessary to improve it. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a polyurethane production equipment to increase the heating and cooling speeds, make the heating and cooling more uniform, reduce the temperature difference of the polyurethane, and improve the product quality of the polyurethane.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: a polyurethane production equipment, including a reaction device, a hot and cold water circulation machine, a nitrogen generating device and a vacuum pumping device,

[0006] The reaction device includes a reaction kettle and at least one stirring mechanism. The nitrogen generating device and the vacuum pumping device are connected to the inner cavity of the reaction kettle through air pipes.

[0007] The reactor comprises a tank body and an upper cover, wherein the upper cover is arranged on the upper part of the tank body, a feed pipe is arranged on the upper cover, a discharge pipe is arranged on the bottom of the tank body, a stirring mechanism comprises a stirring driving mechanism, a stirring drum and a plurality of stirring blade assemblies, the upper end of the stirring drum is open and the lower end is sealed, the upper part of the stirring drum is rotatably mounted on the upper cover and the lower part extends into the tank body, the stirring driving mechanism is arranged on the upper cover and is transmission-connected with the stirring drum, and each stirring blade assembly is arranged at intervals on the outer wall of the stirring drum along the vertical direction;

[0008] A first spiral thermostatic tube and a second spiral thermostatic tube are arranged in the mixing drum. The first spiral thermostatic tube and the second spiral thermostatic tube are arranged at intervals in the vertical direction. The lower ends of the first spiral thermostatic tube and the second spiral thermostatic tube are connected. An outer thermostatic spiral tube is wrapped around the outer wall of the tank body. The two ends of the outer thermostatic spiral tube, the upper end of the first spiral thermostatic tube and the upper end of the second spiral thermostatic tube are respectively connected to the hot and cold water circulation machine.

[0009] In a further technical solution, the reaction device is provided with three stirring mechanisms, the stirring drums of the three stirring mechanisms are arranged at intervals along the circumferential direction, each stirring drum is provided with a first spiral thermostatic tube and a second spiral thermostatic tube, and the stirring drive mechanism is respectively connected to the three stirring mechanisms.

[0010] In a further technical solution, the stirring drive mechanism includes a driving motor, a transmission assembly and a driving gear. The driving gear is rotatably installed on the central part of the upper cover. The driving motor is transmission-connected to the transmission assembly, and the transmission assembly is transmission-connected to the driving gear. A transmission gear is provided on the upper part of the stirring drum. The transmission gear is located above the upper cover, and the driving gear is respectively meshed with the transmission gears of each stirring mechanism.

[0011] In a further technical solution, a rotating mounting hole is opened in the upper cover corresponding to the position of each mixing drum, the mixing drum is rotatably mounted in the rotating mounting hole, a rotating bearing is embedded in the rotating mounting hole, a plane bearing is provided on the upper part of the mixing drum, and the plane bearing is located between the transmission gear and the upper cover.

[0012] In a further technical solution, the mixing blade assembly includes a blade fixing ring and a plurality of spiral blades, the blade fixing ring is sleeved on the mixing drum, and the spiral blades are spaced apart on the outer side surface of the blade fixing ring along the circumferential direction;

[0013] The stirring blade assemblies of each stirring mechanism are staggered in the vertical direction.

[0014] In a further technical solution, an insulation cover is provided on the upper end of the mixing drum, and two pipe holes are opened on the upper part of the insulation cover. The upper ends of the first spiral constant temperature tube and the second spiral constant temperature tube respectively pass through the two pipe holes and extend out of the insulation cover, and the insulation cover and the mixing drum rotate relative to each other.

[0015] In a further technical solution, the reaction device is further provided with a heat preservation barrel, the tank body is arranged in the heat preservation barrel, and the external constant temperature spiral tube is located between the heat preservation barrel and the tank body;

[0016] A lower flange connecting ring is arranged on the upper edge of the insulation barrel, an upper flange connecting ring is arranged on the upper edge of the tank body, the upper cover, the upper flange connecting ring and the lower flange connecting ring are fixedly connected by multiple bolts, and multiple supporting feet are arranged on the bottom of the insulation barrel.

[0017] In a further technical solution, a first temperature sensor is arranged near the center of the upper cover, and a second temperature sensor is arranged near the edge of the upper cover, and the first temperature sensor and the second temperature sensor are respectively extended into the tank body;

[0018] An inner thermostatic control valve is arranged between the first spiral thermostatic tube and / or the second spiral thermostatic tube and the hot and cold water circulation machine, and an outer thermostatic control valve is arranged between at least one end of the outer thermostatic spiral tube and the hot and cold water circulation machine.

[0019] In a further technical solution, a nitrogen control valve is provided on the air pipe connecting the nitrogen generator and the reactor, a vacuum control valve and a pressure sensor are provided on the air pipe connecting the vacuum pumping device and the reactor, the pressure sensor is located between the vacuum control valve and the reactor, the feed pipe is provided with a feed control valve, and the discharge pipe is provided with a discharge control valve.

[0020] In a further technical solution, the production equipment is also provided with a control device, which is electrically connected to the first temperature sensor, the second temperature sensor, the nitrogen control valve, the vacuum control valve, the pressure sensor, the feed control valve, the discharge control valve, the internal constant temperature control valve, the external constant temperature control valve, the stirring drive mechanism, the hot and cold water circulation machine, the nitrogen generator and the vacuum pumping device.

[0021] After adopting the above structure, the utility model has the advantages compared with the prior art: the polyurethane is heated or cooled from the inside of the reactor by the first spiral thermostatic tube and the second spiral thermostatic tube, and the polyurethane is heated or cooled from the outside of the reactor by the outer thermostatic spiral tube, and the inside and outside are heated and cooled at the same time, which improves the heating and cooling speed, and the polyurethane is heated and cooled more evenly without temperature difference, thereby improving the product quality of the polyurethane; multiple stirring mechanisms stir at the same time, and multiple first spiral thermostatic tubes and multiple second spiral thermostatic tubes are thermostatic at multiple points, which improves the heating and cooling speed, and can accurately control the reaction process of the polyurethane; the first spiral thermostatic tube and the second spiral thermostatic tube are arranged inside the stirring drum, which reduces the space occupied, prevents the stirring blade assembly from interfering with the first spiral thermostatic tube and the second spiral thermostatic tube, and improves reliability and stability; the polyurethane in the center of the reactor and the polyurethane on the periphery are detected by the first temperature sensor and the second temperature sensor, and the hot and cold water are independently controlled to enter the first spiral thermostatic tube, the second spiral thermostatic tube and the outer thermostatic spiral tube in real time, thereby further improving the uniformity of heating and cooling. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The utility model is further described below in conjunction with the accompanying drawings and embodiments.

[0023] Figure 1 It is a connection schematic diagram of the utility model;

[0024] Figure 2 It is a structural schematic diagram of the reaction device of the utility model;

[0025] Figure 3 It is a schematic diagram of the internal structure of the reaction device of the utility model;

[0026] Figure 4 It is an exploded view of the mixing drum, the first spiral thermostatic tube and the second spiral thermostatic tube of the utility model.

[0027] In the figure:

[0028] 1 reaction kettle, 11 tank body, 111 external thermostatic spiral tube, 112 discharge pipe, 113 discharge control valve, 114 upper flange connection ring, 12 upper cover, 121 feed pipe, 122 feed control valve;

[0029] 2 stirring mechanism, 21 stirring drum, 211 transmission gear, 22 first spiral thermostatic tube, 23 second spiral thermostatic tube, 24 stirring blade assembly, 241 blade fixing ring, 242 spiral blade, 25 heat preservation cover, 251 pipe penetration hole;

[0030] 31 driving motor, 32 transmission assembly, 33 driving gear, 34 rotary bearing, 35 plane bearing;

[0031] 4: insulation barrel, 41: lower flange connection ring, 42: supporting foot;

[0032] 51 a first temperature sensor, 52 a second temperature sensor;

[0033] 61 hot and cold water circulation machine, 611 internal constant temperature control valve, 612 external constant temperature control valve, 62 nitrogen generating device, 621 nitrogen control valve, 63 vacuum pumping device, 631 vacuum control valve, 632 pressure sensor, 64 air pipe. DETAILED DESCRIPTION

[0034] The following are only preferred embodiments of the present invention, and do not limit the protection scope of the present invention.

[0035] A polyurethane production device, such as Figures 1 to 4 As shown, it includes a reaction device, a hot and cold water circulation machine 61, a nitrogen generating device 62 and a vacuum device 63. The reaction device includes a reactor 1 and at least one stirring mechanism 2. The nitrogen generating device 62 and the vacuum device 63 are respectively connected to the inner cavity of the reactor 1 through an air pipe 64. The reactor 1 includes a tank body 11 and an upper cover 12. The upper cover 12 is arranged on the upper part of the tank body 11. The upper cover 12 is provided with a feed pipe 121. The bottom of the tank body 11 is provided with a discharge pipe 112. The stirring mechanism 2 includes a stirring drive mechanism, a stirring drum 21 and a plurality of stirring blade assemblies 24. The upper end of the stirring drum 21 is open and the lower end is sealed. The upper part of the stirring drum 21 is rotatably installed on the upper cover 12 and the lower cover 12. The stirring drum 21 extends into the tank body 11, the stirring drive mechanism is arranged on the upper cover 12 and is transmission-connected with the stirring drum 21, and each stirring blade assembly 24 is arranged at intervals on the outer wall of the stirring drum 21 in the vertical direction; a first spiral thermostatic tube 22 and a second spiral thermostatic tube 23 are arranged in the stirring drum 21, the first spiral thermostatic tube 22 and the second spiral thermostatic tube 23 are arranged at intervals in the vertical direction, and the lower ends of the first spiral thermostatic tube 22 and the second spiral thermostatic tube 23 are connected, and an outer thermostatic spiral tube 111 is wound around the outer wall of the tank body 11, and the two ends of the outer thermostatic spiral tube 111, the upper end of the first spiral thermostatic tube 22 and the upper end of the second spiral thermostatic tube 23 are respectively connected to the cold and hot water circulation machine 61.

[0036] Traditional polyurethane production equipment only heats or cools the reactor 1 from the outside. The temperature difference of the polyurethane in the reactor 1 is large, and the heating and cooling speeds are slow, which causes branching and cross-linking of the linear molecular chains of the polyurethane, affecting the regularity between the molecules. The utility model heats or cools the polyurethane from the inside of the reactor 1 through the first spiral thermostatic tube 22 and the second spiral thermostatic tube 23, and at the same time, the outer thermostatic spiral tube 111 heats or cools the polyurethane from the outside of the reactor 1. The inside and outside are heated and cooled at the same time, which improves the heating and cooling speed, and the polyurethane is heated and cooled more evenly without temperature difference, thereby improving the product quality of the polyurethane; the first spiral thermostatic tube 22 and the second spiral thermostatic tube 23 are arranged inside the mixing drum to reduce space occupancy, prevent the mixing blade assembly 24 from interfering with the first spiral thermostatic tube 22 and the second spiral thermostatic tube 23, and improve reliability and stability; the first spiral thermostatic tube 22 and the second spiral thermostatic tube 23 have a large contact area with the internal liquid, which further increases the heating and cooling speed.

[0037] Specifically, the reaction device is provided with three stirring mechanisms 2, and the stirring drums 21 of the three stirring mechanisms 2 are arranged at intervals along the circumferential direction. A first spiral thermostatic tube 22 and a second spiral thermostatic tube 23 are arranged in each stirring drum 21, and the stirring driving mechanism is respectively connected to the three stirring mechanisms 2. The multiple stirring mechanisms 2 stir at the same time, and the multiple first spiral thermostatic tubes 22 and the multiple second spiral thermostatic tubes 23 are kept at multiple points to increase the heating and cooling speeds, and can accurately control the reaction process of the polyurethane.

[0038] Specifically, the stirring drive mechanism includes a driving motor 31, a transmission assembly 32 and a driving gear 33. The driving gear 33 is rotatably mounted on the center of the upper cover 12. The driving motor 31 is in transmission connection with the transmission assembly 32. The transmission assembly 32 is in transmission connection with the driving gear 33. A transmission gear 211 is provided on the upper part of the stirring drum 21. The transmission gear 211 is located above the upper cover 12. The driving gear 33 is respectively engaged with the transmission gear 211 of each stirring mechanism 2. Multiple stirring drums 21 are driven to rotate simultaneously by one driving motor 31, which has a simple structure, low cost and small space occupation.

[0039] Specifically, the upper cover 12 is provided with a rotational mounting hole at a position corresponding to each mixing drum 21, and the mixing drum 21 is rotationally mounted in the rotational mounting hole, and a rotational bearing 34 is embedded in the rotational mounting hole. A plane bearing 35 is sleeved on the upper part of the mixing drum 21, and the plane bearing 35 is located between the transmission gear 211 and the upper cover 12. The friction between the mixing drum 21 and the upper cover 12 is reduced by the rotational bearing 34 and the plane bearing 35, so that the mixing drum 21 rotates more smoothly, and at the same time, the driving pressure of the driving motor 31 is reduced, and the driving can be completed by a single motor, thereby reducing the failure rate.

[0040] Specifically, the stirring blade assembly 24 includes a blade fixing ring 241 and a plurality of spiral blades 242. The blade fixing ring 241 is sleeved on the stirring drum 21, and each spiral blade 242 is arranged at intervals along the circumferential direction on the outer side of the blade fixing ring 241; the stirring blade assemblies 24 of each stirring mechanism 2 are staggered in the vertical direction. Each stirring blade assembly 24 is staggered with each other, so that the length of the spiral blade 242 can be increased, the stirring effect can be improved, and the production efficiency can be improved.

[0041] Specifically, the upper end of the mixing drum 21 is sleeved with a heat preservation cover 25, and two pipe penetration holes 251 are provided on the upper part of the heat preservation cover 25. The upper ends of the first spiral thermostatic tube 22 and the second spiral thermostatic tube 23 respectively pass through the two pipe penetration holes 251 and extend out of the heat preservation cover 25, and the heat preservation cover 25 and the mixing drum 21 are relatively rotated. The heat preservation cover 25 prevents the heat loss in the mixing drum 21, and improves the heating effect of the first spiral thermostatic tube 22 and the second spiral thermostatic tube 23.

[0042] Specifically, the reaction device is further provided with an insulation barrel 4, the tank body 11 is arranged in the insulation barrel 4, and the external thermostatic spiral tube 111 is located between the insulation barrel 4 and the tank body 11; the upper edge of the insulation barrel 4 is provided with a lower flange connection ring 41, the upper edge of the tank body 11 is provided with an upper flange connection ring 114, the upper cover 12, the upper flange connection ring and the lower flange connection ring 41 are fixedly connected by multiple bolts, and the bottom of the insulation barrel 4 is provided with multiple supporting feet 42. The tank body 11 is insulated by the insulation barrel 4, so that a sealed heating chamber is formed between the insulation barrel 4 and the tank body 11, and the external thermostatic spiral tube 111 is located in the heating chamber to prevent the heat loss of the external thermostatic spiral tube 111 and improve the heating effect of the external thermostatic spiral tube 111. At the same time, the upper cover 12, the tank body 11 and the insulation barrel 4 are directly connected by bolts, which has a simple structure, low cost, and is easy to open for maintenance and cleaning.

[0043] Specifically, a first temperature sensor 51 is provided near the center of the upper cover 12, and a second temperature sensor 52 is provided near the edge of the upper cover 12. The first temperature sensor 51 and the second temperature sensor 52 extend into the tank body 11 respectively; an inner thermostatic control valve 611 is provided between the first spiral thermostatic tube 22 and / or the second spiral thermostatic tube 23 and the cold and hot water circulation machine 61, and an outer thermostatic control valve 612 is provided between at least one end of the outer thermostatic spiral tube 111 and the cold and hot water circulation machine 61. The first temperature sensor 51 and the second temperature sensor 52 are used to detect the temperature of the polyurethane in the center of the reactor and the polyurethane in the periphery, and the cold and hot water are independently controlled to enter the first spiral thermostatic tube 22, the second spiral thermostatic tube 23 and the outer thermostatic spiral tube 111 in real time, so as to further improve the uniformity of heating and cooling. Preferably, an inner thermostatic control valve 611 is provided between the first and second spiral thermostatic tubes 22 and 23 and the hot and cold water circulation machine 61, and the corresponding inner thermostatic control valve 611 is opened and closed according to the flow direction of the liquid to control whether the liquid flows into the first and second spiral thermostatic tubes 22 and 23; outer thermostatic control valves 612 are provided between the two ends of the outer thermostatic spiral tube 111 and the hot and cold water circulation machine 61, and the corresponding inner thermostatic control valve 611 is opened and closed according to the flow direction of the liquid to control whether the liquid flows into the outer thermostatic spiral tube 111. One end of the outer thermostatic spiral tube 111 is connected to the first spiral thermostatic tube 22, and the other end of the outer thermostatic spiral tube 111 is connected to the first spiral thermostatic tube 22. The inner thermostatic control valve 611 and the outer thermostatic control valve 612 are both provided between the connection between the first and second spiral thermostatic tubes 22 and 23 and the outer thermostatic spiral tube 111.

[0044] Specifically, a nitrogen control valve 621 is provided on the air pipe 64 connecting the nitrogen generator 62 and the reactor 1, a vacuum control valve 631 and a pressure sensor 632 are provided on the air pipe 64 connecting the vacuum pump 63 and the reactor 1, the pressure sensor 632 is located between the vacuum control valve 631 and the reactor 1, the feed pipe 121 is provided with a feed control valve 122, and the discharge pipe 112 is provided with a discharge control valve 113. The nitrogen control valve 621 controls the nitrogen generator 62 to inject nitrogen into the reactor 1, the vacuum control valve 631 controls the vacuum degree in the reactor 1, and the pressure sensor 632 is used to detect the vacuum degree inside the reactor 1 and cooperate with the vacuum control valve 631 to adjust the vacuum degree.

[0045] Specifically, the production equipment is also provided with a control device, which is electrically connected to the first temperature sensor 51, the second temperature sensor 52, the nitrogen control valve 621, the vacuum control valve 631, the pressure sensor 632, the feed control valve 122, the discharge control valve 113, the internal constant temperature control valve 611, the external constant temperature control valve 612, the stirring drive mechanism, the hot and cold water circulation machine 61, the nitrogen generator 62 and the vacuum pump 63. Automatic control is achieved through the control device. The control device obtains the temperature of the polyurethane through the first temperature sensor 51 and the second temperature sensor 52. When the temperature difference is too large, the internal constant temperature control valve 611 and the external constant temperature control valve 612 are automatically controlled to open and close to achieve automatic constant temperature. The vacuum degree inside the reactor 1 is detected through the pressure sensor 632, and the vacuum control valve 631 is opened and closed according to demand. The control device also automatically opens and closes the stirring drive mechanism and the nitrogen control valve 621 at the corresponding time point through the preset processing steps to achieve fully automatic production without manual intervention, with a high degree of automation and easy use.

[0046] The above contents are only preferred embodiments of the present invention. For ordinary technicians in this field, according to the concept of the present invention, there will be changes in the specific implementation methods and application scopes. The contents of this specification should not be understood as limiting the present invention.

Claims

1. A polyurethane production equipment, characterized in that: It comprises a reaction device, a hot and cold water circulation machine (61), a nitrogen generating device (62) and a vacuum pumping device (63), The reaction device comprises a reaction kettle (1) and at least one stirring mechanism (2), wherein a nitrogen generating device (62) and a vacuum pumping device (63) are respectively connected to the inner cavity of the reaction kettle (1) via air pipes (64). The reaction kettle (1) comprises a tank body (11) and an upper cover (12), wherein the upper cover (12) is arranged on the upper part of the tank body (11), the upper cover (12) is provided with a feed pipe (121), and the bottom of the tank body (11) is provided with a discharge pipe (112), the stirring mechanism (2) comprises a stirring drive mechanism, a stirring drum (21) and a plurality of stirring blade assemblies (24), the upper end of the stirring drum (21) is open and the lower end is sealed, the upper part of the stirring drum (21) is rotatably mounted on the upper cover (12), and the lower part extends into the tank body (11), the stirring drive mechanism is arranged on the upper cover (12) and is transmission-connected to the stirring drum (21), and the stirring blade assemblies (24) are arranged at intervals on the outer wall of the stirring drum (21) in the vertical direction; A first spiral thermostatic tube (22) and a second spiral thermostatic tube (23) are arranged in the mixing drum (21); the first spiral thermostatic tube (22) and the second spiral thermostatic tube (23) are arranged at intervals in the vertical direction; the lower ends of the first spiral thermostatic tube (22) and the second spiral thermostatic tube (23) are connected; an outer thermostatic spiral tube (111) is wound around the outer wall of the tank body (11); the two ends of the outer thermostatic spiral tube (111), the upper end of the first spiral thermostatic tube (22) and the upper end of the second spiral thermostatic tube (23) are respectively connected to the cold and hot water circulation machine (61).

2. A polyurethane production equipment according to claim 1, characterized in that: The reaction device is provided with three stirring mechanisms (2), the stirring drums (21) of the three stirring mechanisms (2) are arranged at intervals in the circumferential direction, each stirring drum (21) is provided with a first spiral thermostatic tube (22) and a second spiral thermostatic tube (23), and the stirring drive mechanism is respectively connected to the three stirring mechanisms (2) in a transmission manner.

3. A polyurethane production equipment according to claim 2, characterized in that: The stirring drive mechanism comprises a driving motor (31), a transmission assembly (32) and a driving gear (33); the driving gear (33) is rotatably mounted on the central portion of the upper cover (12); the driving motor (31) is drivingly connected to the transmission assembly (32); the transmission assembly (32) is drivingly connected to the driving gear (33); a driving gear (211) is arranged on the upper portion of the stirring drum (21); the driving gear (211) is located above the upper cover (12); and the driving gear (33) is respectively meshed with the driving gear (211) of each stirring mechanism (2).

4. A polyurethane production equipment according to claim 3, characterized in that: The upper cover (12) is provided with a rotational mounting hole at a position corresponding to each of the mixing drums (21); the mixing drum (21) is rotationally mounted in the rotational mounting hole; a rotational bearing (34) is embedded in the rotational mounting hole; a plane bearing (35) is sleeved on the upper part of the mixing drum (21); the plane bearing (35) is located between the transmission gear (211) and the upper cover (12).

5. The polyurethane production equipment according to claim 2, characterized in that: The stirring blade assembly (24) comprises a blade fixing ring (241) and a plurality of spiral blades (242); the blade fixing ring (241) is sleeved on the stirring drum (21); and the spiral blades (242) are arranged at intervals on the outer side surface of the blade fixing ring (241) along the circumferential direction; The stirring blade assemblies (24) of each stirring mechanism (2) are arranged in a staggered manner along the vertical direction.

6. The polyurethane production equipment according to claim 1, characterized in that: The upper end of the mixing drum (21) is sleeved with a heat-insulating cover (25), and the upper portion of the heat-insulating cover (25) is provided with two pipe-through holes (251). The upper ends of the first spiral thermostatic tube (22) and the second spiral thermostatic tube (23) respectively pass through the two pipe-through holes (251) and extend out of the heat-insulating cover (25). The heat-insulating cover (25) and the mixing drum (21) are relatively rotatable.

7. The polyurethane production equipment according to claim 1, characterized in that: The reaction device is further provided with a heat preservation barrel (4), the tank body (11) is arranged in the heat preservation barrel (4), and the external constant temperature spiral tube (111) is located between the heat preservation barrel (4) and the tank body (11); A lower flange connection ring (41) is provided on the upper edge of the heat preservation barrel (4), and an upper flange connection ring (114) is provided on the upper edge of the tank body (11); the upper cover (12), the upper flange connection ring (114) and the lower flange connection ring (41) are fixedly connected by a plurality of bolts; and a plurality of supporting feet (42) are provided on the bottom of the heat preservation barrel (4).

8. The polyurethane production equipment according to claim 1, characterized in that: A first temperature sensor (51) is disposed near the center of the upper cover (12), and a second temperature sensor (52) is disposed near the edge of the upper cover (12); the first temperature sensor (51) and the second temperature sensor (52) respectively extend into the tank body (11); An internal thermostatic control valve (611) is provided between the first spiral thermostatic tube (22) and / or the second spiral thermostatic tube (23) and the cold and hot water circulation machine (61), and an external thermostatic control valve (612) is provided between at least one end of the external thermostatic spiral tube (111) and the cold and hot water circulation machine (61).

9. A polyurethane production equipment according to claim 8, characterized in that: The air pipe (64) connecting the nitrogen generating device (62) and the reactor (1) is provided with a nitrogen control valve (621); the air pipe (64) connecting the vacuum pumping device (63) and the reactor (1) is provided with a vacuum control valve (631) and a pressure sensor (632); the pressure sensor (632) is located between the vacuum control valve (631) and the reactor (1); the feed pipe (121) is provided with a feed control valve (122); and the discharge pipe (112) is provided with a discharge control valve (113).

10. The polyurethane production equipment according to claim 9, characterized in that: The production equipment is also provided with a control device, which is electrically connected to the first temperature sensor (51), the second temperature sensor (52), the nitrogen control valve (621), the vacuum control valve (631), the pressure sensor (632), the feed control valve (122), the discharge control valve (113), the internal constant temperature control valve (611), the external constant temperature control valve (612), the stirring drive mechanism, the hot and cold water circulation machine (61), the nitrogen generating device (62) and the vacuum pumping device (63).

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