Catalytic hydrogenation device for preparing 1, 4-cyclohexane dimethylamine

Abstract

The invention discloses a catalytic hydrogenation device for 1, 4-cyclohexane dimethylamine preparation, and relates to the technical field of 1, 4-cyclohexane dimethylamine preparation, the catalytic hydrogenation device comprises a reaction barrel and a feeding assembly; a display and a PLC are installed at the upper end of the reaction barrel, a temperature sensor and a pressure sensor are installed at the upper end of the interior of the reaction barrel, a rotating hole is formed in the middle of the upper end of the reaction barrel, a rotating pipe is rotatably connected to the interior of the rotating hole, two corresponding stirring frames are fixed to the circumferential face of the rotating pipe, and the stirring frames are fixed to the upper end of the reaction barrel. Uniformly distributed discharge ports are formed in the lower end of the circumferential surface of the rotating pipe, two corresponding gear rings are fixed in the reaction barrel, a sealing assembly is mounted at the lower end of the interior of the rotating pipe, a rotating assembly is mounted at the upper end of the reaction barrel, the rotating assembly is connected with the rotating pipe, and a material injection assembly is mounted on the circumferential surface of the rotating pipe. The raw materials can rapidly permeate to any position of the catalyst, and the utilization efficiency of the catalyst is improved.

Description

Technical Field

[0001] The invention relates to the technical field of 1,4-cyclohexanedimethylamine preparation, in particular to a catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine. Background Art

[0002] 1,4-cyclohexanedimethylamine is an organic compound with the chemical formula C6H14N2. It is mainly used in epoxy resin curing agents, polyamide and isocyanate raw materials, polyurethane intermediates and anticorrosion and rust inhibitors. The preparation of 1,4-cyclohexanedimethylamine is mainly achieved through a specific catalytic hydrogenation process. In this case, a catalytic hydrogenation unit is required when using it. The catalytic hydrogenation device in the prior art needs to inject the raw materials from the top into the interior and contact with the catalyst part. However, the injection position of the raw materials will be too concentrated by direct injection or spraying, and the uniform mixing effect cannot be achieved efficiently, thus reducing the reaction efficiency. On the other hand, during the catalytic process, the raw materials injected from the top cannot quickly penetrate into any position of the catalyst, resulting in large differences in the final reaction degree of catalysts at different depths, and the catalyst utilization rate is not high. For this reason, we propose a catalytic hydrogenation device for the preparation of 1,4-cyclohexanedimethylamine. Summary of the invention

[0003] The technical problem to be solved by the present invention is to overcome the existing defects and provide a catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine, which can enable the raw materials to quickly penetrate into any position of the catalyst, improve the utilization efficiency of the catalyst, and effectively solve the problems in the background technology.

[0004] To achieve the above-mentioned object, the present invention provides the following technical solution: A catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine, comprising a reaction barrel and a feeding assembly; Reaction barrel: a display and a PLC controller are installed at the upper end, a temperature sensor and a pressure sensor are installed at the upper end of the reaction barrel, a rotating hole is opened in the middle of the upper end of the reaction barrel, a rotating tube is rotatably connected inside the rotating hole, two corresponding stirring racks are fixed on the circumferential surface of the rotating tube, a uniformly distributed discharge port is opened at the lower end of the circumferential surface of the rotating tube, two corresponding gear rings are fixed inside the reaction barrel, a sealing assembly is installed at the lower end of the rotating tube, a rotating assembly is installed at the upper end of the reaction barrel, the rotating assembly is connected to the rotating tube, an injection assembly is installed on the circumferential surface of the rotating tube, the injection assembly corresponds to the stirring rack, and a feeding assembly is installed at the upper end of the rotating tube; Feeding assembly: comprising a U-shaped flow guide pipe, a first flow guide pipe and a first one-way valve, four corresponding U-shaped flow guide pipes are fixed on the circumferential surface of the rotating pipe, the U-shaped flow guide pipe is communicated with the inner cavity of the rotating pipe, the side of the U-shaped flow guide pipe is provided with evenly distributed first flow guide holes, the first flow guide pipe is fixed inside the first flow guide hole, the first one-way valve is installed on the circumferential surface of the first flow guide pipe, a stirring assembly is installed inside the U-shaped flow guide pipe, and a toggle assembly is installed on the front side of the U-shaped flow guide pipe, and injection is performed by setting the feeding assembly; Wherein: the input end of the PLC controller is electrically connected to the output end of the external power supply, the output end of the PLC controller is electrically connected to the input end of the display, and the PLC controller is bidirectionally electrically connected to the temperature sensor and the pressure sensor respectively.

[0005] Furthermore, the stirring assembly includes a fixed plate, a rotating shaft, a worm gear and stirring bars. Two corresponding fixed plates are fixed inside the U-shaped guide tube. An opening is opened in the middle of the fixed plate. The two openings are rotatably connected to the inside of the rotating shaft. A worm gear is fixed to the front end of the rotating shaft. Evenly distributed stirring bars are fixed on the circumferential surface of the rotating shaft. The hydrogen, raw materials and catalyst are stirred by setting the stirring assembly.

[0006] Furthermore, the toggle assembly includes a fixed block, a connecting shaft, a worm and a first gear. A fixed block is fixed on the side of the U-shaped guide tube. A connecting hole is opened in the middle of the fixed block. A connecting shaft is rotatably connected inside the connecting hole. A worm is fixed to one end of the connecting shaft, and the worm is meshed with its adjacent worm wheel. A first gear is fixed to the other end of the connecting shaft. All the first gears are respectively meshed with two gear rings. The worm wheel is driven to rotate by setting the toggle assembly.

[0007] Furthermore, the injection assembly includes a rotating barrel, a second flow guide tube, a second one-way valve and a second gear. Four corresponding discharge ports are provided on the circumferential surface of the reaction barrel, and the internal part of the discharge port is rotatably connected to the rotating barrel. Two corresponding mounting holes are provided on the side of the stirring frame, and the rotating barrel is rotatably connected to the internal part of the mounting holes adjacent thereto. Evenly distributed second flow guide tubes are fixed on the circumferential surface of the rotating barrel, and all the second flow guide tubes are communicated with the inner cavity of the rotating barrel. A second one-way valve is installed on the circumferential surface of the second flow guide tube, and a second gear is fixed on the end surface of the rotating barrel, and all the second gears are respectively meshed with two gear rings. The raw materials and hydrogen are injected into the interior of the reaction barrel by setting the injection assembly.

[0008] Furthermore, the sealing assembly includes a fixing ring, an electric telescopic rod, a connecting plate and a sealing rod. The lower end of the reaction barrel is fixed with a fixing ring. Two corresponding electric telescopic rods are installed on the lower end of the fixing ring. A connecting plate is fixed on the telescopic arms of the two electric telescopic rods. A sealing rod is fixed on the upper side of the connecting plate. The upper end of the sealing rod is located at the lower end of the rotating tube. The input end of the electric telescopic rod is electrically connected to the output end of the PLC controller. The rotating tube is sealed by setting the sealing assembly.

[0009] Furthermore, the rotating assembly includes a motor, a third gear and a gear ring. The motor is installed at the upper end of the reaction barrel, and the third gear is fixed on the output shaft of the motor. The gear ring is fixed at the upper end of the rotating tube. The third gear is meshed with the gear ring. The input end of the third gear is electrically connected to the output end of the PLC controller, and the rotating tube is driven to rotate by setting the rotating assembly.

[0010] Furthermore, the feed assembly includes a feed pipe and a connecting flange. The upper end of the rotating tube is rotatably connected to the feed pipe. A connecting flange is fixed on the circumferential surface of the feed pipe. The raw material mixed with hydrogen enters the interior of the rotating tube through the feed pipe.

[0011] Furthermore, two corresponding legs are fixed to the lower end of the reaction barrel, and a bottom plate is fixed to the lower side of the two legs, so that the reaction barrel is supported by arranging the legs and the bottom plate.

[0012] Furthermore, an annular groove is provided in the barrel wall of the reaction barrel, and evenly distributed electric heating tubes are installed inside the annular groove. The input end of the electric heating tube is electrically connected to the output end of the PLC controller, and the interior of the reaction barrel is heated by setting the electric heating tube.

[0013] Furthermore, a material injection port is provided at the upper end of the reaction barrel, and a sealing cover is connected to the inner thread of the material injection port, so that the reaction barrel is sealed by providing the sealing cover.

[0014] Compared with the prior art, the beneficial effects of the present invention are: the catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine has the following advantages: 1. The catalyst is stored by setting a reaction barrel. After storage, the raw material and hydrogen are injected into the inside of the transfer tube through the feed pipe. The raw material and hydrogen entering the transfer tube will evenly enter the inside of the reaction barrel through all the first guide pipes and all the second guide pipes. In this case, they can be evenly mixed with the catalyst in the reaction barrel, and in this case, the utilization efficiency of the catalyst can be preliminarily improved; 2. By setting a rotating assembly, the motor can be started to rotate the third gear during the process of injecting raw materials and hydrogen, and the rotation of the third gear drives the gear ring to rotate, and the rotation of the gear ring drives the rotating tube to rotate, and the rotation of the rotating tube drives all the stirring racks to rotate to perform preliminary stirring of the injected raw materials, hydrogen and catalyst, so that the utilization efficiency of the catalyst can be further improved; 3. By setting the injection assembly, the rotating tube will also drive all the rotating barrels to move during the rotation process, and the movement of all the rotating barrels will drive all the second gears to move. During the movement of all the second gears, under the action of the two gear rings, all the rotating barrels can be driven to rotate with the second gears connected to them as the axis. In this case, all the second guide pipes can be driven to rotate with the second gears as the axis. In this case, the raw materials and hydrogen can be evenly injected into the interior of the catalyst, and the utilization efficiency of the catalyst can be further improved. 4. By setting up a toggle assembly, the rotating tube will also drive all the first gears to move during the rotation process. During the movement of all the first gears, they will rotate under the action of the two gear rings. The rotation of all the first gears drives all the connecting shafts to rotate. The rotation of all the connecting shafts drives all the worms to rotate. The rotation of all the worms drives all the worm wheels to rotate. The rotation of all the worm wheels drives all the rotating shafts to rotate. The rotation of all the rotating shafts drives all the stirring bars to rotate to further stir the raw materials, hydrogen and catalysts and make them fully mixed. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the front structure of the present invention; Figure 2 It is a front side sectional view of the present invention; Figure 3 This is an enlarged view of point A of the present invention; Figure 4 This is an enlarged view of point B of the present invention; Figure 5 A schematic diagram of the structure of the injection assembly of the present invention; Figure 6 It is a schematic diagram of the structure of the feeding assembly of the present invention.

[0016] In the figure: 1 reaction barrel, 2 feeding assembly, 21 U-shaped flow guide pipe, 22 first flow guide pipe, 23 first one-way valve, 3 stirring assembly, 31 fixed plate, 32 rotating shaft, 33 worm gear, 34 stirring bar, 4 toggle assembly, 41 fixed block, 42 ​​connecting shaft, 43 worm, 44 first gear, 5 injection assembly, 51 rotating barrel, 52 second flow guide pipe, 53 second one-way valve, 54 second gear, 6 sealing assembly, 61 fixing ring, 62 electric telescopic rod, 63 connecting plate, 64 sealing rod, 7 rotating assembly, 71 motor, 72 third gear, 74 gear ring, 8 feeding assembly, 81 feeding pipe, 82 connecting flange, 9 rotating pipe, 10 stirring frame, 11 discharge port, 12 legs, 13 electric heating pipe, 14 gear ring, 15 temperature sensor, 16 display, 17 PLC controller, 18 sealing cover, 19 pressure sensor. DETAILED DESCRIPTION

[0017] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0018] See also Figure 1-6 , This embodiment provides a technical solution: a catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine, comprising a reaction barrel 1 and a feeding assembly 2; Reaction barrel 1: A display 16 and a PLC controller 17 are installed at the upper end, a temperature sensor 15 and a pressure sensor 19 are installed at the upper end of the reaction barrel 1, a rotating hole is opened in the middle of the upper end of the reaction barrel 1, a rotating tube 9 is rotatably connected inside the rotating hole, two corresponding stirring racks 10 are fixed on the circumferential surface of the rotating tube 9, and a uniformly distributed discharge port 11 is opened at the lower end of the circumferential surface of the rotating tube 9, two corresponding gear rings 14 are fixed inside the reaction barrel 1, a sealing component 6 is installed at the lower end of the rotating tube 9, a rotating component 7 is installed at the upper end of the reaction barrel 1, the rotating component 7 is connected to the rotating tube 9, an injection component 5 is installed on the circumferential surface of the rotating tube 9, and the injection component 5 and the stirring rack 10 are mutually connected. Correspondingly, a feed assembly 8 is installed at the upper end of the rotating tube 9, and the injection assembly 5 includes a rotating barrel 51, a second guide tube 52, a second one-way valve 53 and a second gear 54. Four corresponding discharge ports are provided on the circumferential surface of the reaction barrel 1, and the inside of the discharge port is rotatably connected with the rotating barrel 51. Two corresponding mounting holes are provided on the side of the stirring frame 10, and the rotating barrel 51 is rotatably connected to the inside of the mounting holes adjacent to it. The circumferential surface of the rotating barrel 51 is fixed with uniformly distributed second guide tubes 52, and all the second guide tubes 52 are communicated with the inner cavity of the rotating barrel 61. The circumferential surface of the second guide tube 52 is installed with a second one-way valve 53, and the end surface of the rotating barrel 51 is fixed with a second gear 54. All the second gears 54 are respectively meshed with the two gear rings 14, the sealing assembly 6 comprises a fixing ring 61, an electric telescopic rod 62, a connecting plate 63 and a sealing rod 64, the lower end of the reaction barrel 1 is fixed with a fixing ring 61, the lower end of the fixing ring 61 is installed with two corresponding electric telescopic rods 62, the telescopic arms of the two electric telescopic rods 62 are fixed with connecting plates 63, the upper side of the connecting plate 63 is fixed with a sealing rod 64, the upper end of the sealing rod 64 is located at the lower end of the rotating tube 9, the input end of the electric telescopic rod 62 is electrically connected to the output end of the PLC controller 17, the rotating assembly 7 comprises a motor 71, a third gear 72 and a gear ring 74, the upper end of the reaction barrel 1 is installed with a motor 71, an electric A third gear 72 is fixed on the output shaft of the machine 71, a gear ring 74 is fixed on the upper end of the rotating tube 9, the third gear 72 is meshed with the gear ring 74, the input end of the third gear 72 is electrically connected to the output end of the PLC controller 17, the feed assembly 8 comprises a feed pipe 81 and a connecting flange 82, the upper end of the rotating tube 9 is rotatably connected with the feed pipe 81, a connecting flange 82 is fixed on the circumferential surface of the feed pipe 81, the raw material mixed with hydrogen enters the inside of the rotating tube 9 through the feed pipe 81, the rotating tube 9 is driven to rotate by setting the rotating assembly 7, the rotating tube 9 is sealed by setting the sealing assembly 6, and the raw material and hydrogen are injected into the inside of the reaction barrel 1 by setting the injection assembly 5; Feeding assembly 2: includes a U-shaped flow guide tube 21, a first flow guide tube 22 and a first one-way valve 23. Four corresponding U-shaped flow guide tubes 21 are fixed on the circumferential surface of the rotating tube 9. The U-shaped flow guide tube 21 is communicated with the inner cavity of the rotating tube 9. The side of the U-shaped flow guide tube 21 is provided with uniformly distributed first flow guide holes. The first flow guide tube 22 is fixed inside the first flow guide hole. The first one-way valve 23 is installed on the circumferential surface of the first flow guide tube 22. A stirring assembly 3 is installed inside the U-shaped flow guide tube 21. A toggle assembly 4 is installed on the front side of the U-shaped flow guide tube 21. The stirring assembly 3 includes a fixed plate 31, a rotating shaft 32, a worm gear 33 and a stirring bar 34. Two corresponding fixed plates 31 are fixed inside the U-shaped flow guide tube 21. An opening is opened in the middle of the fixed plate 31. The two openings are internally connected for rotation. A rotating shaft 32 is provided, a worm gear 33 is fixed to the front end of the rotating shaft 32, stirring bars 34 are evenly distributed on the circumferential surface of the rotating shaft 32, a toggle assembly 4 comprises a fixed block 41, a connecting shaft 42, a worm 43 and a first gear 44, a fixed block 41 is fixed to the side of the U-shaped flow guide tube 21, a connecting hole is provided in the middle of the fixed block 41, a connecting shaft 42 is rotatably connected inside the connecting hole, a worm 43 is fixed to one end of the connecting shaft 42, the worm 43 is meshed with its adjacent worm gear 33, a first gear 44 is fixed to the other end of the connecting shaft 42, all the first gears 44 are respectively meshed with two gear rings 14, the worm gear 33 is driven to rotate by the toggle assembly 4, the hydrogen, raw materials and catalyst are stirred by the stirring assembly 3, and the material is injected by the feeding assembly 2; Among them: the input end of the PLC controller 17 is electrically connected to the output end of the external power supply, the output end of the PLC controller 17 is electrically connected to the input end of the display 16, and the PLC controller 17 is bidirectionally electrically connected to the temperature sensor 15 and the pressure sensor 19 respectively.

[0019] Wherein: two corresponding legs 12 are fixed at the lower end of the reaction barrel 1, and a bottom plate is fixed at the lower side of the two legs 12, and the reaction barrel 1 is supported by arranging the legs 12 and the bottom plate.

[0020] Wherein: an annular groove is opened in the barrel wall of the reaction barrel 1, and evenly distributed electric heating pipes 13 are installed inside the annular groove. The input end of the electric heating pipe 13 is electrically connected to the output end of the PLC controller 17, and the interior of the reaction barrel 1 is heated by setting the electric heating pipe 13.

[0021] The upper end of the reaction barrel 1 is provided with a material injection port, and the inner thread of the material injection port is connected with a sealing cover 18 , and the reaction barrel 1 is sealed by setting the sealing cover 18 .

[0022] The working principle of the catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine provided by the present invention is as follows: when in use, the sealing cover 18 can be removed, and then the catalyst is injected into the interior of the reaction barrel 1 for storage. After storage, the raw material and hydrogen are injected into the interior of the rotating tube 9 through the feed pipe 81. During the injection process, the electric heating tube 13 is started according to demand to heat the interior of the reaction barrel 1. During this process, the raw material and hydrogen entering the interior of the rotating tube 9 will pass through all the first guide tubes 22 and all the second guide tubes 52 and enter the interior of the reaction barrel 1 uniformly. In this case, they can be uniformly mixed with the catalyst inside the reaction barrel 1. In this case, the utilization efficiency of the catalyst can be preliminarily improved. During the process of injecting raw materials and hydrogen, the motor 71 can be started to rotate the third gear 72. The rotation of the third gear 72 drives the gear ring 74 to rotate. The rotation of the gear ring 74 drives the rotating tube 9 to rotate. The rotation of the rotating tube 9 drives all the stirring racks 10 to rotate to perform preliminary stirring on the injected raw materials and hydrogen and the catalyst. In this case, the utilization efficiency of the catalyst can be further improved. During the rotation of the rotating tube 9, it will also drive All the rotating barrels 51 move, and the movement of all the rotating barrels 51 drives all the second gears 54 to move. During the movement of all the second gears 54, under the action of the two gear rings 14, all the rotating barrels 51 can be driven to rotate with the second gears 54 connected thereto as the axis. In this case, all the second guide pipes 52 can be driven to rotate with the second gears 54 as the axis. In this case, the raw materials and hydrogen can be evenly injected into the interior of the catalyst. In this case, the utilization efficiency of the catalyst can be further improved. During the rotation of the rotating tube 9, all the first gears 44 will also be driven to move. During the movement of all the first gears 44, they rotate under the action of the two gear rings 14. The rotation of all the first gears 44 drives all the connecting shafts 42 to rotate. The rotation of all the connecting shafts 42 drives all the worms 43 to rotate. The rotation of all the worms 43 drives all the worm wheels 33 to rotate. The rotation of all the worm wheels 33 drives all the rotating shafts 32 to rotate. The rotation of all the rotating shafts 32 drives all the stirring bars 34 to rotate to further stir the raw materials, hydrogen and catalyst to make them fully mixed.

[0023] It is worth noting that the PLC controller 17 disclosed in the above embodiment is specifically a Siemens S7-200 model, the electric telescopic rod 62 can use a TGC-A high-thrust electric telescopic rod, the motor 71 can use a 1LE0003 three-phase asynchronous motor, the electric heating tube 13, the temperature sensor 15 and the pressure sensor 17 can be freely configured according to the actual application scenario, and the control switch group controls the operation of the electric telescopic rod 62, the motor 71 and the electric heating tube 13 using methods commonly used in the prior art.

[0024] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. 1,4-cyclohexanedimethylamine preparation catalytic hydrogenation device, characterized by: It comprises a reaction barrel (1) and a feeding assembly (2); A reaction barrel (1): a display (16) and a PLC controller (17) are installed at the upper end; a temperature sensor (15) and a pressure sensor (19) are installed at the upper end of the reaction barrel (1); a rotating hole is opened in the middle of the upper end of the reaction barrel (1); a rotating tube (9) is rotatably connected inside the rotating hole; two corresponding stirring racks (10) are fixed on the circumferential surface of the rotating tube (9); a uniformly distributed discharge port (11) is opened at the lower end of the circumferential surface of the rotating tube (9); two corresponding gear rings (14) are fixed inside the reaction barrel (1); a sealing component (6) is installed at the lower end of the rotating tube (9); a rotating component (7) is installed at the upper end of the reaction barrel (1); the rotating component (7) is connected to the rotating tube (9); an injection component (5) is installed on the circumferential surface of the rotating tube (9); the injection component (5) and the stirring rack (10) correspond to each other; a feeding component (8) is installed at the upper end of the rotating tube (9); A feeding assembly (2): comprising a U-shaped flow guide tube (21), a first flow guide tube (22) and a first one-way valve (23); four corresponding U-shaped flow guide tubes (21) are fixed on the circumferential surface of the rotating tube (9); the U-shaped flow guide tubes (21) are in communication with the inner cavity of the rotating tube (9); evenly distributed first flow guide holes are opened on the side surface of the U-shaped flow guide tube (21); the first flow guide tube (22) is fixed inside the first flow guide hole; the first one-way valve (23) is installed on the circumferential surface of the first flow guide tube (22); a stirring assembly (3) is installed inside the U-shaped flow guide tube (21); and a toggle assembly (4) is installed on the front side of the U-shaped flow guide tube (21); The input end of the PLC controller (17) is electrically connected to the output end of an external power supply, the output end of the PLC controller (17) is electrically connected to the input end of a display (16), and the PLC controller (17) is bidirectionally electrically connected to a temperature sensor (15) and a pressure sensor (19).

2. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 1, characterized in that: The stirring assembly (3) comprises a fixed plate (31), a rotating shaft (32), a worm gear (33) and stirring bars (34); two corresponding fixed plates (31) are fixed inside the U-shaped flow guide tube (21); an opening is provided in the middle of the fixed plate (31); the rotating shaft (32) is rotatably connected inside the two openings; a worm gear (33) is fixed at the front end of the rotating shaft (32); and stirring bars (34) are evenly distributed and fixed on the circumferential surface of the rotating shaft (32).

3. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 2, characterized in that: The toggle assembly (4) comprises a fixed block (41), a connecting shaft (42), a worm (43) and a first gear (44); the fixed block (41) is fixed on the side of the U-shaped guide tube (21); a connecting hole is provided in the middle of the fixed block (41); a connecting shaft (42) is rotatably connected inside the connecting hole; a worm (43) is fixed to one end of the connecting shaft (42); the worm (43) is meshed with an adjacent worm wheel (33); a first gear (44) is fixed to the other end of the connecting shaft (42); and all the first gears (44) are respectively meshed with two gear rings (14).

4. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 1, characterized in that: The injection assembly (5) comprises a rotating barrel (51), a second flow guide tube (52), a second one-way valve (53) and a second gear (54). Four corresponding discharge ports are provided on the circumferential surface of the reaction barrel (1), and the inside of the discharge port is rotatably connected to the rotating barrel (51). Two corresponding mounting holes are provided on the side of the stirring frame (10), and the rotating barrel (51) is rotatably connected to the inside of the mounting holes adjacent thereto. The circumferential surface of the rotating barrel (51) is fixed with uniformly distributed second flow guide tubes (52), and all the second flow guide tubes (52) are in communication with the inner cavity of the rotating barrel (61). The circumferential surface of the second flow guide tube (52) is installed with a second one-way valve (53). The end surface of the rotating barrel (51) is fixed with a second gear (54), and all the second gears (54) are respectively meshed with two gear rings (14).

5. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 1, characterized in that: The sealing assembly (6) comprises a fixing ring (61), an electric telescopic rod (62), a connecting plate (63) and a sealing rod (64); the fixing ring (61) is fixed to the lower end of the reaction barrel (1); two corresponding electric telescopic rods (62) are mounted on the lower end of the fixing ring (61); the connecting plate (63) is fixed to the telescopic arms of the two electric telescopic rods (62); the sealing rod (64) is fixed to the upper side of the connecting plate (63); the upper end of the sealing rod (64) is located at the lower end of the rotating tube (9); the input end of the electric telescopic rod (62) is electrically connected to the output end of the PLC controller (17).

6. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 1, characterized in that: The rotating assembly (7) comprises a motor (71), a third gear (72) and a gear ring (74); the motor (71) is mounted on the upper end of the reaction barrel (1); the third gear (72) is fixed on the output shaft of the motor (71); the gear ring (74) is fixed on the upper end of the rotating tube (9); the third gear (72) is meshed with the gear ring (74); and the input end of the third gear (72) is electrically connected to the output end of the PLC controller (17).

7. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 1, characterized in that: The feed assembly (8) comprises a feed pipe (81) and a connecting flange (82); the upper end of the interior of the rotating tube (9) is rotatably connected to the feed pipe (81); and a connecting flange (82) is fixed to the circumferential surface of the feed pipe (81).

8. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 1, characterized in that: Two corresponding legs (12) are fixed to the lower end of the reaction barrel (1), and a bottom plate is fixed to the lower sides of the two legs (12).

9. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 1, characterized in that: An annular groove is provided in the barrel wall of the reaction barrel (1), and evenly distributed electric heating pipes (13) are installed inside the annular groove. The input end of the electric heating pipe (13) is electrically connected to the output end of the PLC controller (17).

10. The catalytic hydrogenation device for preparing 1,4-cyclohexanedimethylamine according to claim 1, characterized in that: The upper end of the reaction barrel (1) is provided with an injection port, and the inner thread of the injection port is connected to a sealing cover (18).

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