M-nitrobenzotrifluoride synthesis sealing pipeline connecting pipe fitting and process

Abstract

The invention relates to the field of pipeline connection, in particular to an m-nitrobenzotrifluoride synthesis sealing pipeline connecting pipe fitting and a process, the m-nitrobenzotrifluoride synthesis sealing pipeline connecting pipe fitting comprises two pipelines fixed at the lower end of a working platform, a step pipe is arranged between the opposite ends of the two pipelines, and one end of the step pipe coaxially extends to form a sealing cover; an adapting pipe is coaxially installed in the sealing cover in a sliding mode, a sealing piece is arranged between the adapting pipe and the sealing cover, slot pipes are coaxially embedded in one end of the adapting pipe and the other end of the stepped pipe, the opposite ends of the two pipelines are inserted into the two slot pipes correspondingly, first sealing rings are arranged on the inner surfaces of the slot pipes, and second sealing rings are arranged on the inner surfaces of the first sealing rings. The first sealing ring abuts against the inner surface of the pipeline, and the first sealing ring is arranged in a hollow mode. According to the connecting structure, pipelines without connecting structures can be communicated, the pipelines can be reinforced after being communicated, the use requirements are effectively met, and meanwhile use is convenient.

Description

Technical Field

[0001] The present invention relates to the field of pipeline connection, and particularly to a connecting fitting and process for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride. Background Art

[0002] When synthesizing m-nitrobenzotrifluoride using a reaction kettle, it is generally necessary to use a sealed pipeline to transport materials. At the same time, for the convenience of operating the reaction kettle, most reaction kettles are installed on a working platform, and the sealed pipeline is fixed by being hoisted below the working platform to ensure that the pipeline does not shake during transportation.

[0003] When connecting two pipelines together, connecting fittings are required for connection. However, most of the existing connecting fittings are installed by means of connection methods such as flange plates or threads. When connecting pipelines without a connection structure at some connection ends, the connecting fittings cannot be installed, that is, the phenomenon that the pipelines cannot be connected occurs. At the same time, the existing connecting fittings only have the function of connecting pipelines, with a single function and it is difficult to meet the usage requirements. Summary of the Invention

[0004] The purpose of the present invention is to solve the deficiencies in the background art, and to propose a connecting fitting and process for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride.

[0005] To achieve the above object, the technical solution adopted by the present invention is as follows: A connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride, including two pipelines fixed to the lower end of a working platform. A stepped pipe is arranged between the opposite ends of the two pipelines. One end of the stepped pipe coaxially extends with a cover. An adaptor pipe is coaxially and slidably installed inside the cover. A sealing member is arranged between the adaptor pipe and the cover. One end of the adaptor pipe and the other end of the stepped pipe are both coaxially inlaid with socket pipes. The opposite ends of the two pipelines are respectively inserted into the two socket pipes. A first sealing ring is arranged on the inner surface of the socket pipe. The first sealing ring presses tightly against the inner surface of the pipeline. The first sealing ring is hollowly arranged, and a gas is filled inside the first sealing ring. A boss ring is slidably installed inside the socket pipe. The boss ring presses tightly against the side surface of the first sealing ring. A reinforcing member is arranged on the upper end of the cover. The reinforcing member is respectively connected to the working platform and the boss ring.

[0006] Preferably, the sealing member includes a sealing groove ring coaxially extending on the outer surface of the adaptor pipe. The sealing groove ring is slidably installed inside the cover. A second sealing ring is installed inside the sealing groove ring. The second sealing ring presses tightly against the inner side surface of the cover.

[0007] Preferably, a third sealing ring is provided on the side of the other end of the adaptor tube. The third sealing ring abuts against the side of the cover, and the other end of the adaptor tube is slidably installed inside the stepped tube.

[0008] Preferably, the reinforcing member includes a guiding and fixing frame fixedly installed at the upper end of the cover. A hanging frame is embedded at the end of the guiding and fixing frame. A clamping groove is formed at the end of the hanging frame, and the clamping groove is engaged with the lower part of the channel steel of the working platform. A threaded rod is rotatably installed through the middle of the hanging frame, and a synchronous frame is screwed on the outer surface of the threaded rod. One end of the synchronous frame is connected with a pressing plate, and the pressing plate presses against the inner lower end of the channel steel of the working platform.

[0009] Preferably, a vertical frame extends from the end of the pressing plate, and the end of the vertical frame is fixed to the synchronous frame. The other end of the synchronous frame is fixedly installed with a synchronous frame, and the synchronous frame is slidably installed on the outer surface of the guiding and fixing frame. Two main guide sleeves are slidably installed on both sides of the guiding and fixing frame, and a top pipe frame is connected between the two main guide sleeves and both sides of the synchronous frame.

[0010] Preferably, top rings are coaxially arranged on the outer sides of the adaptor tube and the stepped tube. The top rings abut against the slot tube, and a plurality of sealing columns are annularly arrayed and embedded through the side of the top ring. The sealing columns slidably penetrate inside the slot tube, and the end of the sealing column is fixed to the convex ring. A guide column is embedded through the lower part of the guiding and fixing frame, and the main guide sleeve is slidably installed on the outer surface of the guide column. A secondary guide sleeve is arranged above the stepped tube, and the secondary guide sleeve is slidably installed on the outer surface of the guide column. Gate-shaped frames are fixedly installed at the lower ends of the secondary guide sleeve and the main guide sleeve above the adaptor tube. Force dividing frames extend from both ends of the gate-shaped frame, and the end of the force dividing frame is fixed to the top ring. A pushing claw extends from the lower end of the main guide sleeve above the stepped tube, and the pushing claw abuts against the secondary guide sleeve.

[0011] Preferably, a first connecting ear extends from the upper end of the main guide sleeve, and the end of the first connecting ear is rotatably connected to one end of the top pipe frame. Second connecting ears extend from both sides of the synchronous frame, and the end of the second connecting ear is rotatably connected to the other end of the top pipe frame. A square rod extends from the side of the guiding and fixing frame near the lower part of the guide column, and the pushing claw is slidably installed on the outer surface of the square rod.

[0012] A connection process for a sealed pipeline for synthesizing m-nitrobenzotrifluoride is also provided, including the following steps:

[0013] S1: Insert the slot tube on the stepped tube into one of the pipelines. At this time, the clamping groove on the hanging frame is engaged with the lower part of the channel steel of the working platform;

[0014] S2: Then rotate the threaded rod to drive the pressing plate to move downward, and at the same time push out the adaptor tube in the cover, so that the slot tube on the adaptor tube is inserted into the other pipeline;

[0015] S3: Then continue to rotate the threaded rod so that the first sealing ring presses tightly against the pipeline to seal between the socket pipe and the pipeline. At this time, the downward-moving pressure plate just presses tightly against the inner lower end of the channel steel of the working platform, thereby connecting the two pipelines and strengthening the pipeline.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] 1. Insert the socket pipe on the stepped pipe into one of the pipelines, and then rotate the threaded rod to drive the synchronous frame to move downward, so that the pipe jacking frame can move, driving the two main sleeves to move in opposite directions synchronously, pushing out the adaptor pipe in the cover, making the socket pipe on the adaptor pipe gradually move towards the other pipeline and inserting it into the other pipeline. After the insertion is completed, the sealing groove ring just slides against the inner wall of the cover to position the protruding adaptor pipe, so that the adaptor pipe will not continue to protrude. At the same time, the push claw just contacts the secondary guide sleeve. Then continue to rotate the threaded rod, making the two main sleeves continue to move in opposite directions to push the top rings on both sides respectively, so that the top rings can press against the socket pipe to prevent retraction. During this process, the boss ring will slide in the socket pipe driven by the top ring to squeeze the first sealing ring, generating a reaction force under the extrusion of the gas in the first sealing ring, making the first sealing ring closely contact the inner wall of the pipeline to seal the gap between the socket pipe and the pipeline. In this way, the pipelines without connection structures can be connected, effectively meeting the usage requirements.

[0018] 2. When the threaded rod rotates, the synchronous frame will also drive the pressure plate to move downward, making the hanger hold tightly the lower part of the channel steel of the working platform to fix the cover, etc., so that after being connected to the pipeline, it can play a role in strengthening the pipeline, further meeting the usage requirements. And only by rotating the threaded rod, the connection and strengthening operations of the pipeline can be completed, with a simple process, effectively facilitating the use. Description of the Drawings

[0019] Figure 1 It is a schematic structural diagram of a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention;

[0020] Figure 2 It is a schematic diagram of the cover part of a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention;

[0021] Figure 3 It is a cross-sectional view of a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention;

[0022] Figure 4 It is a Figure 3 magnified view of A in a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention;

[0023] Figure 5 For a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention Figure 3 Enlarged view of B in;

[0024] Figure 6 Schematic diagram of the boss ring of a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention;

[0025] Figure 7 Usage view of a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention;

[0026] Figure 8 Clamping view of the channel steel of the working platform and the hanging bracket of a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention;

[0027] Figure 9 For a connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to the present invention Figure 7 Enlarged view of C in.

[0028] In the figure: 1, pipeline; 2, adapting pipe; 3, cover; 4, pipe support; 5, guiding and fixing frame; 6, hanging bracket; 7, threaded rod; 8, synchronization frame; 9, pressing plate; 10, stepped pipe; 11, first sealing ring; 12, boss ring; 13, working platform; 14, capping column; 15, top ring; 16, second sealing ring; 17, sealing groove ring; 18, third sealing ring; 19, force dividing frame; 20, portal frame; 21, main guiding sleeve; 22, guiding column; 23, square rod; 24, pushing claw; 25, secondary guiding sleeve; 26, synchronization frame; 27, slot pipe; 28, first connecting ear; 29, second connecting ear; 30, vertical frame; 31, clamping groove. Detailed implementation manners

[0029] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0030] Such as Figures 1 - 9A kind of connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride as shown, including two pipelines 1 fixed to the lower end of the working platform 13. A stepped pipe 10 is arranged between the opposite ends of the two pipelines 1. One end of the stepped pipe 10 extends coaxially with a cover 3. The stepped pipe 10 and the cover 3 play a role in connecting and communicating. An adaptor pipe 2 is coaxially and slidably installed inside the cover 3, which can ensure that the two socket pipes 27 are smoothly inserted onto the two fixed pipelines 1. A seal is arranged between the adaptor pipe 2 and the cover 3. One end of the adaptor pipe 2 and the other end of the stepped pipe 10 are both coaxially inlaid with socket pipes 27. The opposite ends of the two pipelines 1 are respectively inserted into the interiors of the two socket pipes 27. The socket pipes 27 play a role in connecting and communicating with the pipelines 1 by insertion. A first sealing ring 11 is arranged on the inner surface of the socket pipe 27. The first sealing ring 11 abuts against the inner surface of the pipeline 1. The first sealing ring 11 is hollow, and a gas is filled inside the first sealing ring 11. A boss ring 12 is slidably installed inside the socket pipe 27. The boss ring 12 abuts against the side surface of the first sealing ring 11. Driven by the top ring 15, the boss ring 12 slides inside the socket pipe 27 and squeezes the first sealing ring 11, so that the gas inside the first sealing ring 11 generates a reaction force under extrusion, enabling the first sealing ring 11 to be in close contact with the inner wall of the pipeline 1, so as to seal the gap between the socket pipe 27 and the pipeline 1 to prevent leakage. A reinforcing member is arranged at the upper end of the cover 3. The reinforcing member is respectively connected to the working platform 13 and the boss ring 12.

[0031] The seal includes a sealing groove ring 17 coaxially extending on the outer surface of the adaptor pipe 2. The sealing groove ring 17 is slidably installed inside the cover 3. When the adaptor pipe 2 slides, the sealing groove ring 17 will slide synchronously inside the cover 3. After the socket pipe 27 is inserted and completed, the sealing groove ring 17 just slides against the inner wall of the cover 3 to position the protruding adaptor pipe 2, so that the adaptor pipe 2 will not continue to protrude. A second sealing ring 16 is installed inside the sealing groove ring 17. The second sealing ring 16 abuts against the inner side surface of the cover 3. The sealing groove ring 17 can press the second sealing ring 16 onto the cover 3 to seal the adaptor pipe 2 and the cover 3.

[0032] A third sealing ring 18 is arranged on the side surface of the other end of the adaptor pipe 2. The third sealing ring 18 abuts against the side surface of the cover 3. The other end of the adaptor pipe 2 can press the third sealing ring 18 onto the cover 3 to perform secondary sealing on the adaptor pipe 2 and the cover 3 to prevent leakage at the connection between the adaptor pipe 2 and the cover 3. The other end of the adaptor pipe 2 is slidably installed inside the stepped pipe 10.

[0033] The reinforcement member includes a guide fixing frame 5 fixedly installed at the upper end of the cover 3. A hanging frame 6 is embedded at the end of the guide fixing frame 5. The guide fixing frame 5 plays a connecting role. A clamping groove 31 is provided at the end of the hanging frame 6. The hanging frame 6 plays a role in fixing the cover 3, etc. The clamping groove 31 is engaged with the lower part of the channel steel of the working platform 13, which can prevent displacement. A threaded rod 7 is rotatably installed through the middle of the hanging frame 6. A synchronous frame 8 is screwed on the outer surface of the threaded rod 7. One end of the synchronous frame 8 is connected with a pressing plate 9. The pressing plate 9 presses against the inner lower end of the channel steel of the working platform 13. By rotating the threaded rod 7, the pressing plate 9 on the synchronous frame 8 can be driven to move downward, so that it can press against the inner lower end of the channel steel of the working platform 13, enabling the hanging frame 6 to tightly hold the lower part of the channel steel of the working platform 13 to fix the cover 3, etc., thereby strengthening the pipeline 1.

[0034] A vertical frame 30 extends from the end of the pressing plate 9. The end of the vertical frame 30 is fixed to the synchronous frame 8. The vertical frame 30 plays a role in fixing the pressing plate 9 and the synchronous frame 8 together. The other end of the synchronous frame 8 is fixedly installed with a synchronous frame 26. The synchronous frame 26 is slidably installed on the outer surface of the guide fixing frame 5. Two main guide sleeves 21 are slidably installed on both sides of the guide fixing frame 5. A pipe jacking frame 4 is connected between the two main guide sleeves 21 and both sides of the synchronous frame 26. The synchronous frame 26 can be driven by the synchronous frame 8 to move downward, so that the pipe jacking frame 4 can move, driving the two main guide sleeves 21 to move synchronously in opposite directions to push out the adaptor pipe 2 in the cover 3, making the slot pipe 27 on the adaptor pipe 2 gradually move towards the pipeline 1 and be inserted into the pipeline 1.

[0035] On the outer sides of both the adaptor tube 2 and the stepped tube 10, there are coaxially arranged top rings 15. The top rings 15 abut against the socket tube 27, which can prevent the socket tube 27 from retracting. The top rings 15 play a role in driving the boss ring 12 to squeeze the first sealing ring 11. On the side surface of the top ring 15, there are multiple sealing columns 14 embedded in a circumferential array. The sealing columns 14 slide through the interior of the socket tube 27, and the ends of the sealing columns 14 are fixed to the boss ring 12. The sealing columns 14 play a role in fixing the boss ring 12 and the top ring 15 together. The lower part of the guide and fixation frame 5 is embedded with a guide post 22. The main guide sleeve 21 is slidably installed on the outer surface of the guide post 22. The guide post 22 plays a role in guiding the main guide sleeve 21. Above the stepped tube 10, there is an auxiliary guide sleeve 25. The auxiliary guide sleeve 25 is slidably installed on the outer surface of the guide post 22. The auxiliary guide sleeve 25 plays a role in driving the top ring 15 at the stepped tube 10 to move. At the lower ends of both the auxiliary guide sleeve 25 and the main guide sleeve 21 above the adaptor tube 2, there are fixedly installed portal frames 20. Both ends of the portal frame 20 extend with force dividing frames 19. The ends of the force dividing frames 19 are fixed to the top ring 15. The cooperation of the portal frame 20 and the force dividing frames 19 can evenly apply the thrust force to the top ring 15. At the lower end of the main guide sleeve 21 above the stepped tube 10, there extends a push claw 24. The push claw 24 abuts against the auxiliary guide sleeve 25. The push claw 24 can push the auxiliary guide sleeve 25. When the two main guide sleeves 21 move synchronously in opposite directions, one of the main guide sleeves 21 will push out the adaptor tube 2 in the cover 3, and the other main guide sleeve 21 will drive the push claw 24 to move towards the auxiliary guide sleeve 25. After the socket tube 27 on the adaptor tube 2 is inserted into the pipeline 1, the push claw 24 just contacts the auxiliary guide sleeve 25. Subsequently, the two main guide sleeves 21 continue to move synchronously in opposite directions, and then the top rings 15 on both sides can be pushed.

[0036] At the upper end of the main guide sleeve 21, there extends a first connecting ear 28. The end of the first connecting ear 28 is rotatably connected to one end of the pipe jacking frame 4. On both sides of the synchronous frame 26, there extend second connecting ears 29. The ends of the second connecting ears 29 are rotatably connected to the other end of the pipe jacking frame 4. Both the first connecting ear 28 and the second connecting ear 29 play a role in facilitating the connection of the pipe jacking frame 4. On the side surface of the guide and fixation frame 5, near the lower part of the guide post 22, there extends a square rod 23. The push claw 24 is slidably installed on the outer surface of the square rod 23. The square rod 23 plays a role in guiding the push claw 24.

[0037] A connection process for a synthetic sealed pipeline of m-nitrobenzotrifluoride is also provided, including the following steps:

[0038] S1: Insert the socket tube 27 on the stepped tube 10 into one of the pipelines 1. At this time, the card slot 31 on the hanging frame 6 is engaged with the lower part of the channel steel of the working platform 13;

[0039] S2: Subsequently, rotate the threaded rod 7 to drive the pressing plate 9 to move downward, and at the same time push out the adaptation pipe 2 in the cover 3, so that the slot pipe 27 on the adaptation pipe 2 is inserted into another pipe 1;

[0040] S3: Then continue to rotate the threaded rod 7 to make the first sealing ring 11 tightly press against the pipe 1 to seal between the slot pipe 27 and the pipe 1. At this time, the downward-moving pressing plate 9 just presses tightly against the inner lower end of the channel steel of the working platform 13, thereby connecting the two pipes 1 and strengthening the pipe 1.

[0041] When connecting, insert the slot pipe 27 on the stepped pipe 10 into one of the pipes 1. At this time, the clamping groove 31 on the hanger 6 is clamped to the lower part of the channel steel of the working platform 13. Subsequently, rotate the threaded rod 7 to drive the synchronous frame 8 on the synchronous frame 8 and the pressing plate 9 to move downward. At this time, the downward-moving synchronous frame 26 allows the pipe jacking frame 4 to move, so as to drive the two main guide sleeves 21 to move in opposite directions synchronously, so as to push out the adaptation pipe 2 in the cover 3, so that the slot pipe 27 on the adaptation pipe 2 gradually moves toward another pipe 1 and is inserted into another pipe 1. After the insertion is completed, the sealing groove ring 17 just slides against the inner wall of the cover 3 to position the extended adaptation pipe 2 so that the adaptation pipe 2 will not continue to extend. At the same time, the push claw 24 just contacts the auxiliary guide sleeve 25. Then continue to rotate the threaded rod 7 to make the two main guide sleeves 21 continue to move in opposite directions to push the top rings 15 on both sides respectively, so that the top rings 15 can press against the slot pipe 27 to prevent retraction. During this process, the boss ring 12 will slide in the slot pipe 27 driven by the top ring 15 to push the first sealing ring 11 by using the boss ring 12, so that the gas in the first sealing ring 11 generates a reaction force under extrusion, so that the first sealing ring 11 can be in close contact with the inner wall of the pipe 1 to seal the gap between the slot pipe 27 and the pipe 1. At this time, the downward-moving pressing plate 9 just presses tightly against the inner lower end of the channel steel of the working platform 13, so that the hanger 6 can be tightly held against the lower part of the channel steel of the working platform 13 to fix the cover 3, etc. In this way, the two pipes 1 can be connected and the reinforcement operation of the pipe 1 can be completed synchronously.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A sealed pipeline connecting fitting for synthesizing m-nitrobenzotrifluoride, comprising two pipelines (1) fixed to the lower end of a working platform (13), characterized in that: A stepped pipe (10) is provided between the opposite ends of the two pipes (1). One end of the stepped pipe (10) extends coaxially with a cover (3). An adaptor pipe (2) is slidably mounted coaxially inside the cover (3). A seal is provided between the adaptor pipe (2) and the cover (3). One end of the adaptor pipe (2) and the other end of the stepped pipe (10) are both coaxially inlaid with socket pipes (27). The opposite ends of the two pipes (1) are respectively inserted into the interiors of the two socket pipes (27). A first sealing ring (11) is provided on the inner surface of the socket pipe (27). The first sealing ring (11) presses tightly against the inner surface of the pipe (1). The first sealing ring (11) is hollow and filled with gas inside. A boss ring (12) is slidably mounted inside the socket pipe (27). The boss ring (12) presses tightly against the side of the first sealing ring (11). A reinforcement is provided at the upper end of the cover (3). The reinforcement is respectively connected to the working platform (13) and the boss ring (12).

2. A connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to claim 1, characterized in that: The seal includes a sealing groove ring (17) extending coaxially on the outer surface of the adaptor pipe (2). The sealing groove ring (17) is slidably mounted inside the cover (3). A second sealing ring (16) is installed inside the sealing groove ring (17). The second sealing ring (16) presses tightly against the inner side surface of the cover (3).

3. A connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to claim 2, characterized in that: A third sealing ring (18) is provided on the side of the other end of the adaptor pipe (2). The third sealing ring (18) presses tightly against the side of the cover (3). The other end of the adaptor pipe (2) is slidably mounted inside the stepped pipe (10).

4. A sealed pipeline connection fitting for synthesizing m-nitrobenzotrifluoride according to claim 3, characterized in that: The reinforcement includes a guiding and fixing frame (5) fixedly installed at the upper end of the cover (3). A hanging frame (6) is inlaid at the end of the guiding and fixing frame (5). A clamping groove (31) is provided at the end of the hanging frame (6). The clamping groove (31) is clamped to the lower part of the channel steel of the working platform (13). A threaded rod (7) is rotatably installed through the middle of the hanging frame (6). A synchronous frame (8) is screwed onto the outer surface of the threaded rod (7). One end of the synchronous frame (8) is connected to a pressing plate (9). The pressing plate (9) presses tightly against the inner lower end of the channel steel of the working platform (13).

5. A sealed pipeline connecting fitting for synthesizing m-nitrobenzotrifluoride according to claim 4, characterized in that: A vertical frame (30) extends from the end of the pressing plate (9). The end of the vertical frame (30) is fixed to the synchronous frame (8). The other end of the synchronous frame (8) is fixedly installed with a synchronous frame (26). The synchronous frame (26) is slidably mounted on the outer surface of the guiding and fixing frame (5). A main guiding sleeve (21) is slidably mounted on both sides of the guiding and fixing frame (5). A pipe jacking frame (4) is connected between the two main guiding sleeves (21) and both sides of the synchronous frame (26).

6. A connecting fitting for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride according to claim 5, characterized in that: On the outer sides of both the adaptation pipe (2) and the stepped pipe (10), a top ring (15) is coaxially arranged. The top ring (15) abuts against the socket pipe (27). A plurality of sealing columns (14) are embedded through the side surface of the top ring (15) in a circular array. The sealing columns (14) slide through the interior of the socket pipe (27). The end of the sealing column (14) is fixed to the boss ring (12). A guide column (22) is embedded through the lower part of the guide fixing frame (5). The main guide sleeve (21) is slidably mounted on the outer surface of the guide column (22). Above the stepped pipe (10), a secondary guide sleeve (25) is provided. The secondary guide sleeve (25) is slidably mounted on the outer surface of the guide column (22). At the lower ends of both the secondary guide sleeve (25) and the main guide sleeve (21) above the adaptation pipe (2), a portal frame (20) is fixedly installed. At both ends of the portal frame (20), a force dividing frame (19) extends. The end of the force dividing frame (19) is fixed to the top ring (15). At the lower end of the main guide sleeve (21) above the stepped pipe (10), a push claw (24) extends. The push claw (24) abuts against the secondary guide sleeve (25).

7. A connecting fitting for a sealed pipeline for synthesizing m-nitrobenzotrifluoride according to claim 6, characterized in that: At the upper end of the main guide sleeve (21), a first connecting ear (28) extends. The end of the first connecting ear (28) is rotatably connected to one end of the pipe jacking frame (4). At both sides of the synchronous frame (26), a second connecting ear (29) extends. The end of the second connecting ear (29) is rotatably connected to the other end of the pipe jacking frame (4). At the side of the guide fixing frame (5) near the lower part of the guide column (22), a square rod (23) extends. The push claw (24) is slidably mounted on the outer surface of the square rod (23).

8. A connection process for a sealed pipeline in the synthesis of m-nitrobenzotrifluoride, which is applied to the connecting pipe fittings of the sealed pipeline in the synthesis of m-nitrobenzotrifluoride described in claim 7, is characterized in that, Including the following steps: S1: Insert the socket pipe (27) on the stepped pipe (10) into one of the pipes (1). At this time, the card slot (31) on the hanging frame (6) is engaged with the lower part of the channel steel of the working platform (13). S2: Then rotate the threaded rod (7) to drive the pressing plate (9) to move downward, and at the same time push out the adaptation pipe (2) in the cover (3), so that the socket pipe (27) on the adaptation pipe (2) is inserted into the other pipe (1). S3: Then continue to rotate the threaded rod (7) to make the first sealing ring (11) tightly press against the pipe (1) to seal between the socket pipe (27) and the pipe (1). At this time, the downward-moving pressing plate (9) just tightly presses against the inner lower end of the channel steel of the working platform (13), thereby connecting the two pipes (1) and strengthening the pipe (1).

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