Horizontal type continuous nitration pipeline reactor and manufacturing method of refrigerant circulation assembly of horizontal type continuous nitration pipeline reactor

Abstract

The invention discloses a horizontal continuous nitration pipeline reactor and a manufacturing method of a refrigerant circulation assembly thereof, and belongs to the technical field of chemical pipeline reactors. The reactor mainly comprises a barrel assembly, a stirring assembly and a refrigerant circulating assembly, and has the advantages of high heat exchange capacity, large unit heat transfer area, high safety and the like. The manufacturing method of the refrigerant circulation assembly is characterized in that a special accessory concentric opposite feeding mechanism is adopted, the mechanism is provided with a bolt chuck and a nut chuck which are coaxial and can move synchronously, and an inner long beam clamping jaw and an outer long beam clamping jaw which can move in the radial direction are arranged on the bolt chuck and the nut chuck respectively. The concentric and opposite accessory feeding mechanism can accurately position components such as angle steel, U-shaped bolts, gaskets and the like and automatically achieve efficient fastening with the spiral coil pipe. According to the method, the technical bottleneck caused by the limited assembly space of the refrigerant circulation assembly is fundamentally solved, efficient and accurate automatic assembly is achieved, and the method has important engineering application value and popularization significance in the technical field of nitrification pipeline reactors.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of chemical pipeline reactors, and in particular, relates to a horizontal continuous nitration pipeline reactor with large unit heat transfer area, strong heat exchange capacity and high safety. Meanwhile, the present application also relates to a method for manufacturing a coolant circulation assembly in the reactor, which can fundamentally solve the technical bottleneck caused by limited assembly space, effectively ensure the assembly precision and speed of the assembly, and thus guarantee the manufacturing quality and long-term operation stability of the entire reactor. BACKGROUND

[0002] The nitration reaction itself is extremely fast and releases a large amount of heat. The reaction is usually carried out in a batch reactor, but there are problems of small unit heat transfer area, concentrated heat release, and high safety risk. To solve this problem, the patent document with patent number CN214765486U discloses a normal temperature and pressure multi-stage pipeline continuous nitration reactor, mainly including a cylinder, a first propulsion section, a primary mixed nitration section, a second propulsion section, a secondary mixed nitration section, a third propulsion section, a rotating shaft, a motor, a jacket, a cooling water return port, a cooling water inlet, a feed inlet, a discharge outlet, a primary acid inlet, a secondary acid inlet, a first temperature measuring point, and a second temperature measuring point. The cylinder is divided into the sections along the axis, and the rotating shaft connected with the motor is arranged in the cylinder. The jacket with the cooling water inlet and outlet is arranged outside the cylinder, and the material inlet, the acid inlet, and the temperature measuring point are arranged on the cylinder.

[0003] However, the traditional pipeline nitration reactor only relies on the jacket outside the cylinder for cooling, and the heat exchange efficiency is low. To improve the heat exchange capacity, the present application adds a coolant circulation assembly inside the main cylinder. The coolant circulation assembly mainly includes a spiral coil and a U-shaped bolt assembly, and its manufacturing mainly faces two difficulties: 1. Limited assembly space, difficult to operate manually: the spiral coil and the main cylinder are both elongated, and are made of a single thick-walled circular tube. Although it is not easy to deform, in order to ensure the heat exchange efficiency, the gap between adjacent coils is extremely narrow (only about the width of a finger), which makes it impossible for a hand to reach in. This makes it more difficult to directly install the U-shaped bolt assembly closer to the middle position than at the two ends.

[0004] 2. High cooperation precision requirement, manufacturing process prone to errors: the angle steel in the assembly needs to be precisely fitted with the inner wall of the main cylinder. If the gap is too large, it will cause shaking, noise and shortening of service life during operation; if the gap is too small, it will cause assembly failure.

[0005] In the sample trial stage, the "stretching method" was used for assembly: that is, by stretching the next coil to temporarily increase the current installation gap, the U-shaped bolt is assembled, and then it is reset and stretched after the subsequent coil, and so on. This method not only consumes time and effort, but also has low efficiency, and more seriously, frequent strong stretching will inevitably lead to plastic deformation of the coil, directly destroying the inherent shape of the spiral coil and the preset matching gap of the angle steel. In order to complete the assembly, a large amount of working hours has to be spent to correct it.

[0006] Therefore, how to realize the rapid and high-precision manufacturing of the refrigerant circulating assembly has become a technical problem that technicians in the field need to solve urgently. SUMMARY

[0007] The purpose of the present application is to provide a horizontal continuous nitrating pipeline reactor with large unit heat transfer area, strong heat exchange capacity and high safety, which solves the problems in the prior art. Meanwhile, the present application also relates to a method for manufacturing the refrigerant circulating assembly in the reactor, which can fundamentally solve the technical bottleneck caused by the limited assembly space, effectively ensure the assembly precision and speed of the assembly, and thus guarantee the manufacturing quality and long-term operation stability of the whole reactor.

[0008] The present application is realized by the following technical solutions: A horizontal continuous nitrating pipeline reactor comprises a cylinder assembly, a stirring assembly and a refrigerant circulating assembly. The stirring assembly comprises a stirring end cover which is tightly and fixedly connected to one end of the cylinder assembly. A driving unit installed on the stirring end cover is in sealed transmission connection with a stirring shaft arranged in a reaction cavity of the cylinder assembly. The end of the stirring shaft is in sealed connection with a refrigerant end cover bearing of the refrigerant circulating assembly. The refrigerant end cover is tightly and fixedly connected to the other end of the cylinder assembly. The refrigerant circulating assembly further comprises a spiral coil. The inlet and outlet pipes of the spiral coil are tightly and fixedly connected to the refrigerant end cover. A plurality of angle steels are uniformly distributed in the circumferential direction of the spiral coil and are in gap cooperation with the inner wall of the reaction cavity of the cylinder assembly. Each coil of the spiral coil is fixedly connected to the angle steel through a U-shaped bolt assembly, and a gasket is arranged at the contact position of the spiral coil and the angle steel.

[0009] Preferably, the driving unit is an electric motor. The sealed transmission between the driving unit and the stirring shaft is realized through a magnetic sealing structure. A pipe mouth connecting flange is further welded on the inlet and outlet pipes of the spiral coil.

[0010] Preferably, the cylinder assembly comprises a main cylinder and an outer jacket sleeved on the periphery of the main cylinder. A spiral guide plate is fixedly connected in the cavity between the main cylinder and the outer jacket. A refrigerated water inlet and outlet pipe is communicated on the outer jacket. A material inlet pipe, a material outlet pipe, a parameter measuring port and a gas phase outlet pipe are communicated on the main cylinder.

[0011] A method for manufacturing a refrigerant circulation component of a horizontal continuous nitration pipeline reactor includes the following steps: Step 1: Fixing the spiral coil; Step Two: Prepare a concentric feeding mechanism for the accessories; the concentric feeding mechanism includes a bolt chuck and a nut chuck coaxially arranged with their clamping claws facing the same direction; both the bolt chuck and nut chuck share a central axis with the spiral coil and can move synchronously along this central axis; the bolt chuck has multiple circumferentially evenly distributed inner beam claws that can move radially along the bolt chuck, and the inner beam claws have multiple bolt contour grooves for accommodating U-bolts arranged along their length; the nut chuck has multiple circumferentially evenly distributed outer beam claws that can move radially along the nut chuck; the outer beam claws have multiple sets of pre-tightening components along their length, and the multiple sets of pre-tightening components on each outer beam claw are all aligned with the opposite... The U-bolts on the inner long beam claws correspond one-to-one; each pre-tightening assembly includes two magnetic nut heads, the central axes of which are collinear with the central axes of the two screw sections of the corresponding U-bolts; the magnetic nut heads are rotatably mounted in the outer long beam claws and are connected to the nut drive mechanism; the end of the magnetic nut head is provided with a cavity for accommodating and driving the nut, and a guide outer cylinder that can reciprocate axially is provided in the axial cavity of the magnetic nut head; the radial movement trajectories of the inner long beam claws and the outer long beam claws are collinear in projection on a plane perpendicular to the central axis of the spiral coil; the outer long beam claws are also provided with an angle steel receiving groove along their length for accommodating angle steel; Step 3: Install the clamping components on the concentric feeding mechanism of the accessories, including embedding the U-bolt into the bolt profile groove; accommodating the movable nut in the cavity of the magnetic nut head; fixing the angle steel in the angle steel receiving groove; and sleeve the washer on the guide outer cylinder and temporarily fix the washer to the angle steel. Step 4: Move the concentric feeding mechanism of the accessories after step 3 toward the spiral coil, so that the inner long beam claw and the outer long beam claw are respectively located on the inner and outer arc sides of the spiral coil, and align the threaded part of each U-bolt with the gap between two adjacent turns of the spiral coil. Step 5: Drive the inner long beam claw to expand radially outward, and drive the outer long beam claw to contract radially inward, so that the threaded part of the U-bolt passes through the gap of the coil, and then passes through the corresponding holes on the washer and angle steel in sequence, until it contacts the moving nut; Step 6: Drive the nut drive mechanism to rotate the moving nut, so that it engages with the threaded part of the U-bolt to the preset tightness; Step 7: Release the angle steel from the outer long beam claw; drive the inner long beam claw to retract radially inward, and drive the outer long beam claw to expand radially outward; then move the concentric feeding mechanism of the accessories away from the spiral coil along the central axis direction; Step 8: Tighten the initially engaged moving nut with final torque; Step 9: Weld the refrigerant end cap and pipe connection flange to complete the assembly.

[0012] Preferably, the nut drive mechanism includes a drive wheel driven by a nut power unit, and a plurality of multi-groove transmission wheels connected in series via an upper belt and a lower belt; the multi-groove transmission wheels are rotatably mounted on the outer long beam claws, and each of the multi-groove transmission wheels drives two magnetic nut heads belonging to the same set of pre-tightening components via two oblique belts.

[0013] Preferably, in step three, the gasket is temporarily fixed to the angle steel by adhesive.

[0014] Preferably, the pre-tightening assembly further includes a locking mechanism for temporarily fixing the gasket to the angle steel in step three; the locking mechanism includes a guide pin that can move axially within the guide outer cylinder; the guide pin includes a limiting part that abuts against the upper end face of the guide outer cylinder and a needle body that is clearance-fitted with the guide outer cylinder, the tail section of the needle body forming multiple elastic flaps through a cut; the needle body also includes an upper body and a tail body with a diameter smaller than the upper body, the two being transitioned by an arc surface; an annular groove is provided at the bottom of the upper body; multiple ball movement holes for radial movement of the ball are provided on the circumferential sidewall at the end of the guide outer cylinder, the ball is adapted to the annular groove, and when the ball is embedded in the annular groove, the ball part protrudes from the outer surface of the guide outer cylinder; a return spring is provided between the upper end face of the guide outer cylinder and the limiting stop fixed on the outer beam claw.

[0015] Preferably, the bolt contour groove is provided with a spring plunger for pre-fixing the U-bolt; the angle steel is fixed in the angle steel receiving groove by the angle steel clamping assembly; the angle steel clamping assembly includes a ball head handle threadedly connected to the outer beam claw, and a clamping plate fixedly disposed at the end of the ball head handle.

[0016] Preferably, the concentric feeding mechanism for the accessories is a component of a rapid assembly equipment for refrigerant circulation components; the rapid assembly equipment for refrigerant circulation components further includes a continuous coil assembly conveyor rail; the continuous coil assembly conveyor rail includes a base support beam and a plurality of chuck supports spaced apart along its length; the plurality of chuck supports include a double-sided chuck support and an inner concentric chuck support disposed in the middle section of the base support beam, and a lifting chuck support and an outer concentric chuck support respectively disposed at the two ends of the base support beam; wherein, the lifting chuck support and the double-sided chuck support are disposed opposite to each other, and the outer concentric chuck support... The inner centripetal chuck support and the inner centripetal chuck support are arranged opposite to each other; a cap chuck and a rubber rod chuck are fixed on the double-sided chuck support and arranged coaxially and facing away from each other; the rubber rod chuck is provided with multiple rubber clamping rods for clamping the spiral coil; the cap chuck is used to clamp the refrigerant end cap; between the lifting chuck support and the double-sided chuck support, there is a lifting sliding assembly for the spiral coil to slide; between the inner centripetal chuck support and the outer centripetal chuck support, there is an accessory moving assembly for the accessory concentric feeding mechanism to slide and for driving the concentric feeding mechanism to rotate around its own central axis.

[0017] Preferably, the capping chuck includes a plurality of circumferentially distributed capping claws that can move radially along the capping chuck; each capping claw is slidably provided with a capping support claw; the capping support claw is used to support the refrigerant end cap and moves together with the capping claw as it moves radially inward to press the refrigerant end cap; the lifting sliding assembly includes a lifting slide rod fixedly mounted between the lifting chuck bracket and the double-sided chuck bracket, and a lifting slider for lifting the spiral coil is slidably mounted on the lifting slide rod; the accessory moving assembly includes two accessory turntables respectively mounted on the inner radial chuck bracket and the outer radial chuck bracket, and an accessory slide rod is fixedly mounted between the two accessory turntables; the bolt chuck and the nut chuck are both slidably connected to the accessory slide rod.

[0018] Compared with the prior art, the beneficial effects of the present invention are: 1. The nitration pipeline reactor provided by the present invention significantly improves its overall heat exchange capacity through the structural design of internal and external dual refrigerant circulation, resulting in a large unit heat transfer area and high safety.

[0019] 2. This invention achieves integrated pre-assembly, synchronous conveying, and precise alignment of various assembly components (U-bolts, movable nuts, washers, angle steel, etc.) through a concentric feeding mechanism. This mechanism effectively replaces manual probing operations, transforming the originally discrete and time-consuming manual assembly into a continuous and rapid mechanized process. It not only significantly improves assembly efficiency but also fundamentally solves the technical bottleneck caused by the limited assembly space of the refrigerant circulation components, achieving highly efficient automated operation.

[0020] 3. In the whole process of the assembly method of the present invention, no external force is applied to pull the coiled pipe, thus avoiding plastic deformation of the spiral coiled pipe and positioning deviation of the angle steel from the source, reliably ensuring the precise clearance fit required by the design between the angle steel and the inner wall of the main cylinder, effectively ensuring the assembly accuracy of the refrigerant circulation component, and further guaranteeing the manufacturing quality and long-term operation stability of the entire reactor.

[0021] 4. The rapid assembly equipment for the refrigerant circulation component supporting the present invention integrates the functions of positioning, fixing, conveying and rotating of various accessories in the manufacturing process of the refrigerant circulation component, realizing the whole-process continuous and integrated production from feeding of accessories to offline of finished products. This makes the whole assembly process efficient, smooth and seamless, providing strong support for the large-scale and standardized production of the refrigerant circulation component.

[0022] 5. The manufacturing method and related equipment of the refrigerant circulation component provided by the present invention have important engineering application value and popularization significance in the technical field of pipeline nitrification reactors. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 is a three-dimensional structure schematic diagram of the horizontal continuous nitrification pipeline reactor of the present invention.

[0024] Figure 2 is a sectional structure schematic diagram of the horizontal continuous nitrification pipeline reactor of the present invention.

[0025] Figure 3 is a schematic diagram of the structure of the refrigerant circulation component of the present invention Figure 1 .

[0026] Figure 4 is the enlarged view of part A in the present invention Figure 3 in the present invention.

[0027] Figure 5 is a schematic diagram of the structure of the refrigerant circulation component of the present invention Figure 2 .

[0028] Figure 6 is the present invention Figure 5 in the enlarged view of part B.

[0029] Figure 7 is a schematic diagram of the structure of the concentric and opposite feeding mechanism of the accessories of the present invention Figure 1 .

[0030] Figure 8 is the present invention Figure 7 in the enlarged view of part C.

[0031] Figure 9 is a schematic diagram of the structure of the concentric and opposite feeding mechanism of the accessories of the present invention Figure 2 .

[0032] Figure 10 This is the present invention. Figure 9 Enlarged view of point D in the middle.

[0033] Figure 11 This is a schematic diagram of the structure of one of the outer long beam claws of the present invention.

[0034] Figure 12 This is the present invention. Figure 11 Enlarged view of the structure at point F.

[0035] Figure 13 This is the present invention. Figure 11 A cross-sectional view.

[0036] Figure 14 This is the present invention. Figure 13 Enlarged view of the structure at point E1.

[0037] Figure 15 This is the present invention. Figure 13 Enlarged view of the structure at point E2.

[0038] Figure 16 This is a schematic diagram of the rapid assembly equipment for the refrigerant circulation component of the present invention. Figure 1 .

[0039] Figure 17 This is a schematic diagram of the rapid assembly equipment for the refrigerant circulation component of the present invention. Figure 2 .

[0040] In the picture: 1. Shell assembly; 11. Main shell; 111. Material inlet pipe; 112. Material outlet pipe; 113. Parameter measurement port; 114. Gas phase outlet pipe; 12. Outer jacket; 121. Chilled water inlet and outlet pipes; 13. Spiral guide plate; 2. Agitator assembly; 21. Drive unit; 22. Agitator end cover; 23. Agitator shaft; 3. Refrigerant circulation assembly; 31. Refrigerant end cover; 32. Spiral coil; 33. Angle steel; 35. U-bolt assembly; 351. Moving nut; 352. U-bolt 36. Bolt; 37. Gasket; 4. Concentric feed mechanism for accessories; 451. Bolt chuck; 4511. Inner beam jaw; 4512. Bolt profile groove; 4513. Spring plunger; 452. Nut chuck; 4521. Outer beam jaw; 4522. Angle steel receiving groove; 4523. Limiting plate; 46. Nut drive mechanism; 462. Multi-groove drive wheel; 463. Inclined belt; 464. Upper belt; 465. Lower belt; 467. Drive wheel; 47. 471. Pre-tightening assembly; 472. Magnetic nut tip; 473. Guide outer cylinder; 474. Ball bearing movable hole; 475. Guide pin; 476. Annular groove; 4777. Limiting part; 4778. Pin body; 479. Upper body; 400. Elastic flap; 400. Tail body; 470. Ball bearing; 471. Return spring; 48. Angle steel clamping assembly; 491. Ball head handle; 5. Continuous assembly conveyor rail for coils; 51. Foundation support beam; 521. Double-sided chuck bracket; 522. Capping chuck; 5221. Capping jaw; 5222. Capping support jaw; 523. Rubber rod chuck; 524. Rubber clamping bar; 53. Inner centripetal chuck bracket; 54. Lifting chuck bracket; 55. Outer centripetal chuck bracket; 56. Lifting sliding assembly; 561. Lifting slide bar; 562. Lifting slider; 57. Accessory moving assembly; 571. Accessory turntable; 572. Accessory slide bar; 61. Quick assembly station; 62. Spiral coil preparation station; 63. Accessory preparation station. Detailed Implementation

[0041] To enable readers to better understand the design intent of this invention, the technical solutions described below are further described in conjunction with the accompanying drawings and embodiments. It should be noted that the directional terms that may appear in the following paragraphs, including but not limited to "up," "down," "left," "right," "front," and "back," are based on the visual orientation shown in the accompanying drawings and should not be considered as limiting the scope of protection or technical solutions of this invention. Their purpose is merely to facilitate a better understanding of the technical solutions described in this invention by those skilled in the art.

[0042] In the description of this specification, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances and in conjunction with common knowledge in the field, design specifications, standard documents, etc.

[0043] Example 1

[0044] like Figures 1 to 6 As shown, a horizontal continuous nitration pipeline reactor includes a cylindrical assembly 1, a stirring assembly 2, and a refrigerant circulation assembly 3. The stirring assembly 2 includes a stirring end cap 22 that is sealed and fixedly connected to one end of the cylindrical assembly 1. A drive unit 21 mounted on the stirring end cap 22 is sealed and driven by a stirring shaft 23 disposed within the reaction chamber of the cylindrical assembly 1. The end of the stirring shaft 23 is sealed and fixedly connected to a bearing of the refrigerant end cap 31 of the refrigerant circulation assembly 3. The refrigerant end cap 31 is sealed and fixedly connected to the other end of the cylindrical assembly 1. The refrigerant circulation assembly 3 also includes a spiral coil 32. The inlet and outlet pipes of the spiral coil 32 are sealed and fixedly connected to the refrigerant end cap 31. The spiral coil 32 is sealed and fixedly connected to the refrigerant end cap 31 by welding. Figure 4 , Figure 6 As shown, the spiral coil 32 has multiple angle steels 33 evenly distributed circumferentially, which are clearance-fitted with the inner wall of the reaction chamber of the cylinder assembly 1. Each turn of the spiral coil 32 is fixed to the angle steel 33 by a U-bolt assembly 35, and a gasket 36 is placed at the contact point between the spiral coil 32 and the angle steel 33. The drive unit 21 is a motor. The sealing transmission between the drive unit 21 and the stirring shaft 23 is achieved through a magnetic sealing structure, providing good sealing performance. Pipe connection flanges 37 are also welded to the inlet and outlet pipes of the spiral coil 32.

[0045] In other words, the refrigerant circulation assembly 3 includes a refrigerant end cap 31, a spiral coil 32, angle steel 33, a U-bolt assembly 35, a gasket 36, and a pipe connection flange 37, etc., wherein the U-bolt assembly 35 includes a movable nut 351 and a U-bolt 352. Its core assembly relationship is as follows: the opening of the U-bolt 352 faces outwards and is fitted onto the current coil from the inside out; its two screw sections pass through the coil gap, then sequentially pass through the matching gasket 36 mounting holes (the arc surface of the gasket 36 fits against the coil) and the corresponding mounting holes on the angle steel 33, and finally, the movable nut 351 is screwed onto the screw end to achieve a tight fit. Each coil is connected in this manner, thereby evenly and firmly fixing the three angle steels 33 to the circumference of the spiral coil 32. After all the angle steels are fixed, the refrigerant end cap 31 and the pipe connection flange 37 are welded and installed onto the inlet and outlet pipes of the spiral coil 32.

[0046] In this embodiment, the cylinder assembly 1 includes a main cylinder 11 and an outer jacket 12 sleeved around it. A spiral guide plate 13 is fixedly connected to the cavity between the main cylinder 11 and the outer jacket 12. A chilled water inlet / outlet pipe 121 is connected to the outer jacket 12. A material inlet pipe 111, a material outlet pipe 112, a parameter measuring port 113, and a gas phase outlet pipe 114 are connected to the main cylinder 11. The number of pipes, such as the parameter measuring port 113 and the material inlet pipe 111, can be flexibly adjusted according to actual process requirements.

[0047] Due to the intense nitration reaction, this embodiment designs the material inlet pipe 111 as a duplex structure, comprising a solid material inlet pipe and a nitric acid liquid inlet pipe arranged concentrically. The nitric acid liquid inlet pipe has a larger diameter, while the solid material inlet pipe has multiple inlet holes evenly distributed circumferentially at its base to ensure uniform material feeding.

[0048] This embodiment employs a dual-circulation design for chilled water to enhance heat exchange: the external circulation is achieved through the outer jacket 12, with chilled water entering and exiting via the chilled water inlet and outlet pipes 121. The internal circulation is achieved through the refrigerant circulation assembly 3, with chilled water entering through the inlet pipe of the spiral coil 32 and exiting through its outlet pipe.

[0049] The working principle of this embodiment is as follows: Liquid nitric acid and solid materials enter the reaction chamber of the main cylinder 11 through the material inlet pipe 111, and are fully mixed and reacted under the drive of the stirring component 2. The heat generated by the reaction is removed in real time by a dual refrigerant circulation: one is through the circulation of chilled water in the outer jacket 12, and the other is through the circulation of chilled water in the refrigerant circulation component 3. The nitration pipeline reactor provided in this embodiment significantly improves its overall heat exchange capacity through the structural design of the dual internal and external refrigerant circulation.

[0050] The manufacturing process of the horizontal continuous nitration pipeline reactor in this embodiment is roughly as follows: First, the cylinder assembly 1 is prepared, and then the stirring assembly 2 and the refrigerant circulation assembly 3 are assembled as independent modules. After assembly, the stirring assembly 2 is installed and sealed from one end of the main cylinder 11; the refrigerant circulation assembly 3 is installed and sealed from the other end. The pipeline reactor has a slender structure. The refrigerant circulation assembly 3 is installed from the side of the main cylinder 11, and the angle steel 33 is clearance-fitted with the inner wall of the main cylinder 11. This places high demands on the processing and dimensional accuracy of the refrigerant circulation assembly 3. During the manufacturing process, if the spiral coil 32 is twisted or deformed, it will cause the angle steel 33 to deform accordingly, which will prevent the entire refrigerant circulation assembly 3 from being smoothly installed into the main cylinder 11. The high-precision and rapid assembly method of the refrigerant circulation assembly 3 will be specifically described in Embodiment 2.

[0051] Example 2

[0052] This embodiment provides a high-precision, rapid manufacturing method for the refrigerant circulation component 3 described in Embodiment 1. For example... Figures 7 to 17 As shown, a method for manufacturing a refrigerant circulation component of a horizontal continuous nitration pipeline reactor includes the following steps: Step 1: Fix the spiral coil 32; Step 2: Prepare a concentric feeding mechanism 4.

[0053] The concentric feeding mechanism 4 specifically includes a bolt chuck 451 and a nut chuck 452, which are coaxially arranged and have the same orientation of the clamping claws. Both the bolt chuck 451 and the nut chuck 452 share a central axis with the spiral coil 32 and can move synchronously along this central axis. The bolt chuck 451 and the nut chuck 452 can be directly connected as a whole by a rigid connecting plate. The bolt chuck 451 is provided with multiple circumferentially evenly distributed inner beam claws 4511 that can move radially along the bolt chuck 451. The inner beam claws 4511 have multiple bolt contour grooves 4512 arranged along their length to accommodate U-bolts 352. The nut chuck 452 is provided with multiple circumferentially evenly distributed outer beam claws 4521 that can move radially along the nut chuck 452; the outer beam claws 4521 are provided with multiple sets of pre-tightening components 47 along their length direction, and the multiple sets of pre-tightening components 47 on each outer beam claw 4521 correspond one-to-one with the U-bolts 352 on the corresponding inner beam claws 4511.

[0054] Each preload assembly 47 includes two magnetic nut heads 471, the central axes of which are collinear with the central axes of the two threaded portions of the corresponding U-bolts 352. The magnetic nut heads 471 are rotatably mounted in the outer beam claws 4521 and are connected to the nut drive mechanism 46. The end of the magnetic nut head 471 is provided with a cavity for accommodating and driving the moving nut 351, and a guide outer cylinder 472 that can reciprocate axially is provided in the axial cavity of the magnetic nut head 471.

[0055] In addition, the radial movement trajectories of the inner long beam claw 4511 and the outer long beam claw 4521 are collinear in projection on a plane perpendicular to the central axis of the spiral coil 32; the outer long beam claw 4521 is also provided with an angle steel receiving groove 4522 for accommodating the angle steel 33 along its length direction.

[0056] Step 3: Mount the various components onto the concentric feeding mechanism 4, including embedding the U-bolt 352 into the bolt contour groove 4512. Besides positioning, the bolt contour groove 4512 also provides a certain degree of pre-fixation for the U-bolt 352. Place the movable nut 351 into the cavity of the magnetic nut head 471. Through magnetic attraction, the movable nut 351 is reliably held within the cavity of the magnetic nut head 471 to prevent it from falling off during inversion or other operations. Fix the angle steel 33 in the angle steel receiving groove 4522 for later use. When placing it, ensure that the mounting hole on the angle steel 33 is aligned with the guide outer cylinder 472, with a clearance fit. Place the washer 36 onto the guide outer cylinder 472 and temporarily fix it to the angle steel 33; "placed onto" here means that the guide outer cylinder 472 passes through the corresponding mounting hole on the washer 36.

[0057] Step 4: Move the concentric feeding mechanism 4 of the accessories, after the operation in Step 3, toward the spiral coil 32. Control the radial displacement of the inner long beam jaw 4511 and the outer long beam jaw 4521 so that the inner long beam jaw 4511 and the outer long beam jaw 4521 are located on the inner and outer arc sides of the spiral coil 32, respectively. The movement of the inner long beam jaw 4511 and the outer long beam jaw 4521 on the central axis is synchronous. Control the movement of the inner long beam jaw 4511 and the outer long beam jaw 4521 along the central axis to reach the designated position, and align the threaded part of each U-bolt 352 with the gap between two adjacent turns of the spiral coil 32.

[0058] Step 5: Drive the inner long beam claw 4511 to expand radially outward and drive the outer long beam claw 4521 to contract radially inward, so that the threaded part of the U-bolt 352 passes through the coil gap and then passes through the corresponding holes (i.e., the corresponding mounting holes) on the washer 36 and the angle steel 33 in sequence until it contacts the moving nut 351. The radial outward expansion of the inner long beam claw 4511 and the radial inward contraction of the outer long beam claw 4521 mean that both move towards the spiral coil 32.

[0059] Step Six: Drive the nut drive mechanism 46 to rotate the movable nut 351, causing it to engage with the threaded portion of the U-bolt 352 to a preset tightness. During this engagement process, the jaw adjustment knob on the bolt chuck 451 needs to be adjusted simultaneously to further expand the inner long beam jaws 4511 radially, ensuring smooth engagement. The engagement to the preset tightness can be understood as the movable nut 351 reaching a locked state where the nut drive mechanism 46 can no longer rotate.

[0060] Step 7: Release the angle steel 33 from the outer long beam claw 4521 and drive the outer long beam claw 4521 to expand radially outward, so that the angle steel 33 is disengaged from the outer long beam claw 4521. Subsequently, to prevent interference during removal, drive the inner long beam claw 4511 to retract radially inward, while keeping the outer long beam claw 4521 in the expanded state. Then, move the concentric feeding mechanism 4 of the accessories away from the spiral coil 32 along the central axis.

[0061] Step 8: Perform final torque tightening on the initially engaged moving nuts 351. This is done on the outside of the spiral coil 32. Use a torque wrench to perform final torque tightening on all moving nuts 351.

[0062] Step 9: Weld the refrigerant end cap 31 and the pipe connection flange 37 to complete the assembly.

[0063] This embodiment achieves integrated pre-assembly, synchronous conveying, and precise alignment of various assembly components (U-bolts, movable nuts, washers, angle steel, etc.) through a concentric feeding mechanism. This mechanism effectively replaces manual probing operations, transforming the originally discrete and time-consuming manual assembly into a continuous and rapid mechanized process. It not only significantly improves assembly efficiency but also fundamentally solves the technical bottleneck caused by the limited assembly space of the refrigerant circulation components, achieving highly efficient automated operation.

[0064] The assembly method in this embodiment does not require any external force to be applied to the coil during the entire process, which fundamentally avoids the plastic deformation of the spiral coil and the positioning misalignment of the angle steel. This reliably ensures the precise clearance fit between the angle steel and the inner wall of the main cylinder required by the design, effectively ensuring the assembly accuracy of the refrigerant circulation components, and thus guaranteeing the manufacturing quality and long-term operational stability of the entire reactor.

[0065] Example 3

[0066] Based on Embodiment 2, this embodiment continues to describe in detail the technical features involved therein and the functions and roles of these technical features in the present invention, so as to help those skilled in the art to fully understand the technical solution of the present invention and reproduce it.

[0067] like Figures 7 to 12 As shown, the nut drive mechanism 46 in this embodiment includes a drive wheel 467 driven by a nut power unit, and multiple multi-groove drive wheels 462 connected in series via an upper belt 464 and a lower belt 465. The multi-groove drive wheels 462 are rotatably mounted on the outer beam claw 4521, and each multi-groove drive wheel 462 drives two magnetic nut heads 471 belonging to the same set of pre-tightening components 47 via two inclined belts 463.

[0068] The nut drive mechanism 46 can drive all moving nuts 351 and make them rotate almost synchronously. Its power transmission path is as follows: the rotational motion output by the drive wheel 467 is distributed to each multi-groove drive wheel 462 through a transmission chain consisting of an upper belt 464 and a lower belt 465. The rotation of each multi-groove drive wheel 462 then drives the two magnetic nut heads 471 belonging to the same set of pre-tightening components 47 to rotate through two sets of inclined belts 463, thereby driving the moving nuts 351 that are fitted into the cavities of the magnetic nut heads 471 to rotate, ultimately achieving automatic engagement between the moving nuts 351 and the corresponding U-bolt 352 screw section. Furthermore, when a moving nut 351 is tightened to a preset tightening torque, its corresponding magnetic nut head 471 will slip against the corresponding inclined belt 463, thereby cutting off the torque transmission and stopping the nut from further tightening. This allows the other moving nuts 351 to reach their preset torques successively. Once all nuts have reached their preset torques, the nut drive mechanism 46 stops operating.

[0069] In this embodiment, the nut drive mechanism adopts a centralized power distribution and synchronous transmission design. A multi-stage belt system drives all moving nuts to rotate almost synchronously, significantly improving assembly efficiency. Simultaneously, the mechanism features torque control: when a single nut reaches a preset torque, its corresponding transmission component automatically slips, stopping tightening at that point and allowing the remaining moving nuts to wait. This design ensures that all moving nuts ultimately reach a consistent torque, achieving automation and high efficiency in the moving nut tightening operation.

[0070] Example 4

[0071] Based on Embodiments 2 and 3, this embodiment continues to describe in detail the technical features involved and the functions and roles of these technical features in the present invention, so as to help those skilled in the art to fully understand the technical solution of the present invention and reproduce it.

[0072] In step three, the temporary fixing of the gasket 36 to the angle steel 33 can be achieved in two ways: one is to use adhesive to temporarily fix the gasket 36 to the angle steel 33, for example, by pre-applying double-sided tape to the gasket 36. The other is to design a locking mechanism on the pre-tightening assembly 47.

[0073] like Figures 13 to 15As shown, the locking mechanism in this embodiment includes a guide pin 473 that can move axially within the guide outer cylinder 472. The guide pin 473 includes a limiting portion 4732 that abuts against the upper end face of the guide outer cylinder 472, and a pin body 4733 that is clearance-fitted with the guide outer cylinder 472. The tail section of the pin body 4733 forms multiple elastic flaps 4735 through a cut. The design of the elastic flaps 4735 is intended to give the tail section of the pin body 4733 radial elasticity, which allows it to contract radially to make way and automatically reset after the external force is removed. In this embodiment, the needle body 4733 also includes an upper body 4734 and a tail body 4736 with a diameter smaller than that of the upper body 4734, with an arc transition between them. An annular groove 4731 is provided at the bottom of the upper body 4734. Multiple ball movement holes 4721 are provided on the circumferential sidewall at the end of the guide outer cylinder 472 for radial movement of the ball bearings 474. The ball bearings 474 are adapted to the annular groove 4731, and when the ball bearings 474 are embedded in the annular groove 4731, a portion of the ball bearings 474 protrudes from the outer surface of the guide outer cylinder 472. A return spring 475 is provided between the upper end face of the guide outer cylinder 472 and the limiting stop 4523 fixed on the outer beam claw 4521. The function of the return spring 475 is to automatically reset the guide outer cylinder 472 after the compressive force is removed. The end of the guide pin 473 and the mounting hole on the limit stop plate 4523 are both designed to be square, forming an anti-rotation structure, thereby preventing the guide pin 473 from rotating during operation.

[0074] The specific operation process of the temporary fixing shim 36 of the locking mechanism in this embodiment is as follows: In the initial state, the guide pin 473 is in the retracted position, and the diameter of the tail body 4736 is smaller than that of the upper body 4734. At this time, the ball 474 has sufficient radial movement space in the guide outer cylinder 472 and can be completely retracted into the cylinder under the action of external force. Therefore, when the corresponding mounting holes of the angle steel 33 and the shim 36 are clearance-fitted with the guide outer cylinder 472, they can be smoothly inserted without interference. After the shim 36 is inserted, the guide pin 473 is pressed down to move it downward. The arc surface of the tail body 4736 gradually squeezes the ball 474, causing it to gradually protrude towards the surface of the guide outer cylinder 472. As the guide pin 473 continues to descend until the annular groove 4731 aligns with the ball 474, the ball will slightly retract into the guide outer cylinder 472, but will still remain partially protruding, thereby forming a lock to prevent the shim 36 from falling off. Conversely, when the U-bolt 352 screw section compresses the elastic flap 4735, the guide pin 473 is pushed upward, and the ball 474 disengages from the annular groove 4731, restoring ample space for movement. As the screw section continues to run, the guide outer cylinder 472 is forced to move upward, and after the ball 474 contacts the gasket 36, it is completely retracted into the cylinder under compression, allowing the guide outer cylinder 472 to continue moving upward without obstruction until the U-bolt 352 and the moving nut 351 are engaged.

[0075] This embodiment integrates a locking mechanism into the pre-tightening assembly, achieving timely fixing and automatic release of the gasket through a purely mechanical structure. The pre-tightening assembly in this embodiment ingeniously combines positioning, gasket locking, and nut tightening into one unit. Its mechanical interlocking mechanism reliably prevents the gasket from falling off during operation and automatically releases the lock simultaneously when the U-bolt is screwed in, requiring no manual intervention and ensuring the continuity and safety of the operation. The entire mechanism has a compact structure, with precise coordination between the release timing and the tightening process, completely avoiding interference and ultimately ensuring the assembly quality and consistency of the connecting pair.

[0076] In this embodiment, a spring plunger 4513 (also known as a ball screw) for pre-fixing the U-bolt 352 is provided in the bolt contour groove 4512. The angle steel 33 is fixed in the angle steel receiving groove 4522 by the angle steel clamping assembly 48. The angle steel clamping assembly 48 includes a ball-head handle 481 threadedly connected to the outer beam claw 4521 and a clamping plate at its end; tightening the handle will temporarily clamp and fix the angle steel 33 by means of the clamping plate. This design is simple and realizes quick clamping and reliable fixation of the angle steel.

[0077] Example 5

[0078] Based on Embodiments 2, 3, and 4, this embodiment continues to describe in detail the technical features involved and the functions and roles of these technical features in the present invention, so as to help those skilled in the art to fully understand the technical solution of the present invention and reproduce it.

[0079] like Figures 16 to 17 As shown, the concentric feeding mechanism 4 of the accessories in this embodiment is a component of the rapid assembly equipment for refrigerant circulation components. The rapid assembly equipment for refrigerant circulation components also includes a continuous coil assembly conveyor rail 5, which includes a base support beam 51 and multiple chuck brackets spaced apart along its length.

[0080] Multiple chuck supports include a double-sided chuck support 521 and an inner radial chuck support 53 located in the middle section of the foundation support beam 51, and a lifting chuck support 54 and an outer radial chuck support 55 located at the two ends of the foundation support beam 51, respectively. The lifting chuck support 54 is positioned opposite to the double-sided chuck support 521, and the outer radial chuck support 55 is positioned opposite to the inner radial chuck support 53. A coaxially arranged, back-to-back cap chuck 522 and a rubber rod chuck 523 are fixed to the double-sided chuck support 521. The rubber rod chuck 523 has multiple rubber clamping rods 524 for clamping the spiral coil 32. Each rubber clamping rod 524 consists of a metal rod covered with a rubber layer. The metal rod provides rigid support, while the rubber layer protects the surface of the spiral coil 32, preventing wear during clamping. The cap chuck 522 is used to clamp the refrigerant end cap 31, facilitating welding operations on the refrigerant end cap 31. Furthermore, the capping chuck 522 includes a plurality of circumferentially distributed capping claws 5221 that can move radially along the capping chuck 522; each capping claw 5221 is slidably provided with a capping support claw 5222; the capping support claw 5222 is used to support the refrigerant end cap 31 and moves together with the capping claw 5221 as it moves radially inward to press the refrigerant end cap 31. The capping support claw 5222 can slide relative to the capping claw 5221 to adapt to the installation position of the refrigerant end cap 31.

[0081] Between the lifting chuck bracket 54 and the double-sided chuck bracket 521, a lifting sliding assembly 56 is provided for the spiral coil 32 to slide. Between the inner radial chuck bracket 53 and the outer radial chuck bracket 55, an accessory moving assembly 57 is provided for the accessory concentric feeding mechanism 4 to slide and for driving the accessory concentric feeding mechanism 4 to rotate around its own central axis.

[0082] Furthermore, the lifting sliding assembly 56 includes a lifting slide rod 561 fixedly mounted between the lifting chuck bracket 54 and the double-sided chuck bracket 521, and a lifting slider 562 for lifting the spiral coil 32 is slidably mounted on the lifting slide rod 561. The accessory moving assembly 57 includes two accessory turntables 571 respectively mounted on the inner radial chuck bracket 53 and the outer radial chuck bracket 55, and an accessory slide rod 572 fixedly mounted between the two accessory turntables 571; the bolt chuck 451 and the nut chuck 452 are slidably connected to the accessory slide rod 572. The rotation of the accessory turntable 571 can drive the accessory slide rod 572, the bolt chuck 451 and the nut chuck 452 to rotate synchronously. This rotation function is mainly used for two purposes: first, to adjust the working angle to facilitate manual placement of parts; second, to avoid interference between the concentric feeding mechanism of the accessories and the surrounding structures such as the rubber clamping bar when moving along the central axis. Furthermore, the bolt chuck 451 and the nut chuck 452 are integrated by a rigid connecting plate and can slide synchronously along the slide rod. The displacement of this integrated unit relative to the slide rod constitutes the linear feed motion of the concentric feeding mechanism 4 of the accessories along its central axis.

[0083] like Figure 15 As shown, the working area is divided into three stations by the chuck supports: the quick assembly station 61 is between the double-sided chuck support 521 and the inner radial chuck support 53; the spiral coil preparation station 62 is between the lifting chuck support 54 and the double-sided chuck support 521; and the accessory preparation station 63 is between the inner radial chuck support 53 and the outer radial chuck support 55. The radial movement of the jaws in each station is achieved by rotating the adjustment knob on its respective chuck.

[0084] The overall working process of the refrigerant circulation component rapid assembly equipment is as follows: First, the spiral coil 32 is placed on the lifting slider 562 at the spiral coil preparation station 62 and pushed towards the rapid assembly station 61, causing the spiral coil to slide to the assembly position. Then, the adjusting knob on the rubber rod chuck 523 is adjusted to cause the rubber clamping rod 524 to retract radially inward until the spiral coil 32 is clamped. Next, at the accessory preparation station 63, the U-bolt 352, movable nut 351, angle steel 33, and washer 36 are positioned on the accessory concentric feeding mechanism 4, and then the entire mechanism is pushed and slid towards the rapid assembly station 61. At the rapid assembly station 61, the integrated assembly of the spiral coil, U-bolt, movable nut, washer, and angle steel is completed. Then, the components are removed from the accessory concentric feeding mechanism, and the assembled movable nut is finally tightened. Next, the refrigerant end cap 31 is assembled: the end cap is placed on the cap support claw 5222, and the claw is radially contracted by adjusting the knob of the cap chuck 522 to clamp the refrigerant end cap 31; then the cap support claw 5221 is axially slid to locate the installation position of the refrigerant end cap 31 on the inlet and outlet pipes of the spiral coil 32 and welded; then the pipe connection flange 37 installed at the end of the spiral coil is welded, and the refrigerant circulation assembly 3 is now assembled. Finally, the lifting slider 562 is slid to move the finished product back to the spiral coil preparation position 62 and remove it.

[0085] The rapid assembly equipment for refrigerant circulation components in this embodiment integrates the positioning, fixing, conveying, and rotation functions of various components during the manufacturing process, realizing continuous and integrated production from component loading to finished product output. This makes the entire assembly process efficient, smooth, and seamless, providing strong support for the large-scale and standardized production of refrigerant circulation components. The refrigerant circulation component manufacturing method and related equipment provided in this embodiment have significant engineering application value and promotional significance in the field of pipeline nitration reactor technology.

[0086] In summary, these are merely preferred embodiments of the present invention and are not intended to limit the scope of the invention. All equivalent variations and modifications made in accordance with the shape, structure, features, and spirit of the claims of the present invention should be included within the scope of the claims of the present invention.

Claims

1. A horizontal continuous nitration pipe reactor comprising a barrel assembly (1), characterized in that: It also includes stirring assembly (2) and refrigerant circulation assembly (3); The stirring assembly (2) includes the stirring end cover (22) which is closed and fixed with one end of the cylinder assembly (1); the driving unit (21) installed on the stirring end cover (22) is sealingly connected with the stirring shaft (23) arranged in the reaction cavity of the cylinder assembly (1); the end of the stirring shaft (23) is bearing sealingly connected with the refrigerant end cover (31) of the refrigerant circulation assembly (3), and the refrigerant end cover (31) is closed and fixed with the other end of the cylinder assembly (1); The refrigerant circulation assembly (3) further comprises a spiral coil (32), and the inlet and outlet pipes of the spiral coil (32) are closed and fixed with the refrigerant end cover (31), and a plurality of angle steels (33) are uniformly distributed in the circumferential direction of the spiral coil (32) and are matched with the gap between the inner wall of the reaction cavity of the cylinder assembly (1); each circle of the spiral coil (32) is fixed with the angle steel (33) through a U-shaped bolt assembly (35), and a gasket (36) is lined at the contact position of the spiral coil (32) and the angle steel (33).

2. The horizontal continuous nitration pipe reactor according to claim 1, characterized in that: The driving unit (21) is a motor; the sealing transmission between the driving unit (21) and the stirring shaft (23) is realized by a magnetic sealing structure; a pipe opening connecting flange (37) is welded on the inlet and outlet pipes of the spiral coil (32).

3. The horizontal continuous nitration pipe reactor according to claim 1, characterized in that: The cylinder assembly (1) comprises a main cylinder (11) and an outer jacket (12) sleeved on the periphery of the main cylinder (11), and a spiral guide plate (13) is fixed in the cavity between the main cylinder (11) and the outer jacket (12); the outer jacket (12) is provided with a refrigerated water inlet and outlet pipe (121); the main cylinder (11) is provided with a material inlet pipe (111), a material outlet pipe (112), a parameter measuring port (113) and a gas phase outlet pipe (114).

4. A method of manufacturing a horizontal continuous nitration pipe reactor refrigerant circulation assembly, characterized by, The operation steps include: Step one: fix the spiral coil (32); Step two: prepare a fitting concentric feeding mechanism (4); The fitting concentric feeding mechanism (4) comprises a bolt chuck (451) and a nut chuck (452) coaxially arranged and having the same direction of the clamping jaw; the bolt chuck (451) and the nut chuck (452) are coaxial with the spiral coil (32) and can move synchronously along the central axis; A plurality of inner long beam clamping jaws (4511) are arranged on the bolt chuck (451) and can move radially along the bolt chuck (451); the inner long beam clamping jaws (4511) are arranged with a plurality of bolt profile grooves (4512) along the length direction for accommodating the U-shaped bolts (352); A plurality of outer long beam clamping jaws (4521) are arranged on the nut chuck (452) and can move radially along the nut chuck (452); the outer long beam clamping jaws (4521) are arranged with a plurality of pre-tightening assemblies (47) along the length direction, and the plurality of pre-tightening assemblies (47) on each outer long beam clamping jaw (4521) correspond to the U-shaped bolts (352) on the opposite inner long beam clamping jaw (4511) one by one. Each pre-tightening assembly (47) comprises two magnetic nut heads (471), whose central axes are respectively collinear with the central axes of the two screw rod portions of the corresponding U-shaped bolt (352); the magnetic nut heads (471) are rotatably installed in the outer long beam clamping jaw (4521) and are in transmission connection with the nut driving mechanism (46); The magnetic nut head (471) is provided with a cavity at the end for accommodating and driving the nut (351), and an axially reciprocating guide outer cylinder (472) is arranged in the axial cavity of the magnetic nut head (471); The radial movement trajectories of the inner long beam clamping jaw (4511) and the outer long beam clamping jaw (4521) are collinear in the projection on the plane perpendicular to the central axis of the spiral coil (32); The outer long beam clamping jaw (4521) is further provided with an angle steel accommodating groove (4522) along the length direction for accommodating the angle steel (33); Step three: clamping the parts on the fitting concentric and opposite feeding mechanism (4), including embedding the U-shaped bolt (352) into the bolt profiling groove (4512); accommodating the nut (351) in the cavity of the magnetic nut head (471); fixing the angle steel (33) in the angle steel accommodating groove (4522); sleeving the gasket (36) on the guide outer cylinder (472) and temporarily fixing the gasket (36) and the angle steel (33); Step four: moving the fitting concentric and opposite feeding mechanism (4) after the operation in step three to the spiral coil (32), so that the inner long beam clamping jaw (4511) and the outer long beam clamping jaw (4521) are respectively located on the inner and outer arc sides of the spiral coil (32), and the screw rod portions of each U-shaped bolt (352) are aligned with the gaps between adjacent two turns of the spiral coil (32); Step five: driving the inner long beam clamping jaw (4511) to radially expand outward, and driving the outer long beam clamping jaw (4521) to radially contract inward, so that the screw rod portions of the U-shaped bolt (352) pass through the coil gaps and then pass through the corresponding holes in the gasket (36) and the angle steel (33) in sequence until they contact the nut (351); Step six: driving the nut driving mechanism (46) to rotate the nut (351) so that the screw rod portions of the U-shaped bolt (352) are screwed to a preset tightness; Step seven: releasing the fixation of the angle steel (33) on the outer long beam clamping jaw (4521); driving the inner long beam clamping jaw (4511) to radially contract inward and driving the outer long beam clamping jaw (4521) to radially expand outward; then moving the fitting concentric and opposite feeding mechanism (4) away from the spiral coil (32) along the central axis; Step eight: performing final torque tightening on the preliminarily screwed nut (351); Step nine: welding the refrigerant end cover (31) and the pipe opening connecting flange (37) to complete the assembly.

5. The method of claim 4, wherein the horizontal continuous nitration pipe reactor refrigerant circulation assembly is manufactured by the steps of: The nut driving mechanism (46) comprises a driving wheel (467) driven by a nut power unit, and a plurality of multi-groove transmission wheels (462) connected in series through an upper belt (464) and a lower belt (465); the multi-groove transmission wheels (462) are rotatably mounted on an outer long beam claw (4521), and each multi-groove transmission wheel (462) drives two magnetic nut heads (471) belonging to a pre-tightening assembly (47) through two inclined belts (463). ​ 6. The method of claim 4, wherein the horizontal continuous nitration pipe reactor refrigerant circulation assembly is manufactured by the steps of: In the third step, the gasket (36) is temporarily fixed on the angle steel (33) by an adhesive method. ​ 7. The method of claim 4, wherein the horizontal continuous nitration pipe reactor refrigerant circulation assembly is manufactured by the steps of: The pre-tightening assembly (47) further comprises a clamping mechanism for temporarily fixing the gasket (36) on the angle steel (33) in the third step; ​ The clamping mechanism comprises a guide needle (473) axially movable in the guide outer cylinder (472); The guide needle (473) comprises a limiting portion (4732) abutting against the upper end surface of the guide outer cylinder (472), and a needle body (4733) in clearance fit with the guide outer cylinder (472), and the tail section of the needle body (4733) forms a plurality of elastic petals (4735) through a cutout; The needle body (4733) further comprises an upper body (4734) and a tail body (4736) with a smaller diameter than the upper body (4734), and the two are connected by an arc surface; and the bottom of the upper body (4734) is provided with an annular groove (4731); A plurality of ball movable holes (4721) for radial movement of balls (474) are formed in the circumferential sidewall of the end of the guide outer cylinder (472), the balls (474) are matched with the annular groove (4731), and when the balls (474) are embedded in the annular groove (4731), the balls (474) partially protrude from the outer surface of the guide outer cylinder (472); A return spring (475) is arranged between the upper end surface of the guide outer cylinder (472) and the limiting baffle (4523) fixed on the outer long beam claw (4521).

8. The method of claim 4, wherein the horizontal continuous nitration pipe reactor refrigerant circulation assembly is manufactured by the steps of: A spring plunger (4513) for pre-fixing the U-shaped bolt (352) is arranged in the bolt profiling groove (4512); ​ The angle steel (33) is fixed in the angle steel receiving groove (4522) by an angle steel pressing assembly (48); the angle steel pressing assembly (48) comprises a ball head handle (481) threadedly connected with the outer long beam claw (4521), and a pressing piece fixedly arranged at the end of the ball head handle (481).

9. The method of claim 4, wherein the horizontal continuous nitration pipe reactor refrigerant circulation assembly is manufactured by the steps of: The accessory concentric feeding mechanism (4) is a component of the refrigerant circulating assembly rapid assembly equipment; the refrigerant circulating assembly rapid assembly equipment further comprises a coil continuous assembly conveying rack track (5); ​ The coil continuous assembly conveying rack track (5) comprises a basic support beam (51), and a plurality of chuck supports arranged at intervals along the length direction thereof; The plurality of chuck supports include a double-sided chuck support (521) and an inward chuck support (53) arranged at the middle section of the base support beam (51), and a lifting chuck support (54) and an outward chuck support (55) arranged at the two end positions of the base support beam (51) respectively; wherein the lifting chuck support (54) is arranged opposite to the double-sided chuck support (521), and the outward chuck support (55) is arranged opposite to the inward chuck support (53); The double-sided chuck support (521) is fixed with a coaxial back cover chuck (522) and a rubber rod chuck (523) arranged in opposite directions; the rubber rod chuck (523) is provided with a plurality of rubber clamping rods (524) for clamping the spiral pipe (32); the back cover chuck (522) is used for clamping the refrigerant end cover (31); Between the lifting chuck support (54) and the double-sided chuck support (521), a lifting sliding assembly (56) is arranged for the spiral pipe (32) to slide; Between the inward chuck support (53) and the outward chuck support (55), an accessory moving assembly (57) is arranged for the accessory concentrically feeding mechanism (4) to slide, and for driving the concentrically feeding mechanism (4) to rotate around its own center axis.

10. The method of claim 9, wherein the horizontal continuous nitration pipe reactor refrigerant circulation assembly is manufactured by the steps of: The back cover chuck (522) includes a plurality of back cover clamping jaws (5221) uniformly distributed in the circumferential direction and movable radially along the back cover chuck (522); each back cover clamping jaw (5221) is slidably provided with a back cover supporting jaw (5222); the back cover supporting jaw (5222) is used for supporting the refrigerant end cover (31) and moving together with the back cover clamping jaw (5221) radially inward to compress the refrigerant end cover (31); ​ The lifting sliding assembly (56) includes a lifting sliding rod (561) fixedly arranged between the lifting chuck support (54) and the double-sided chuck support (521), and the lifting sliding rod (561) is slidably provided with a lifting sliding block (562) for lifting the spiral pipe (32); The accessory moving assembly (57) includes two accessory rotating discs (571) respectively mounted on the inward chuck support (53) and the outward chuck support (55), and an accessory sliding rod (572) fixedly arranged between the two accessory rotating discs (571); the bolt chuck (451) and the nut chuck (452) are slidably connected with the accessory sliding rod (572).

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