A new type of flange joint for pipe connection

Abstract

The present invention relates to the technical field of flange joints, and in particular to a new type of flange joint for pipe connection, comprising a first mounting tube and a second mounting tube, the first mounting tube comprising a first connecting tube head, a first movable shell and a first locking ring, the first movable shell and the first locking ring are slidably mounted on the first connecting tube head, the first movable shell and the first locking ring are fixedly connected, and the second mounting tube comprises a second connecting tube head, a second movable shell and a second locking ring. The present invention is positioned by setting a limited insertion rod and a limited insertion hole, and at the same time setting an elastic plug and a socket, so that the flange joint can be quickly installed by plugging in during closed installation, and the addition of a safety anti-slip mechanism can effectively prevent the plugged-in flange joint from falling off after being subjected to tension, and the positioning rod in the safety anti-slip mechanism can effectively limit the elastic plug, thereby improving the safety after locking.

Description

Technical Field

[0001] The invention relates to the technical field of flange joints, in particular to a novel flange joint for pipeline connection. Background Art

[0002] Flange joint is a device used for flange sealing. The scope of flange joints is very wide. Flange rubber joints, flange expansion joints, flange force transfer joints, flange hose joints, etc. are collectively referred to as flange joints. The so-called flange joint means that its connection method is connected by flange plates, and there are many materials.

[0003] A high-pressure split flange joint for metal sealing is provided in the patent publication number CN111503392B. The high-pressure split flange joint for metal sealing includes: a flange; a screw hole, which is opened on one side of the flange; a sealing ring, which is arranged on one side of the flange; a fixing ring, which is fixedly connected to one side of the flange surface; a connecting assembly, which is fixedly connected to the other side of the flange surface; a fixing assembly, which is fixedly connected to one side of the fixing ring; a rotating assembly, which is fixedly connected to the top of one side of the fixing ring. The high-pressure split flange joint for metal sealing provided by the present invention is connected twice, thereby preventing the problem of the two flanges being separated when connecting them, and can quickly and firmly fix the pipe to be connected inserted into the interior of the flange.

[0004] In actual operation, most flange joints connected by bolts are more complicated to install, and the mounting holes on the flange need to be aligned, which is inconvenient. In addition, the extrusion seal of the flange depends entirely on the gasket in the middle, and the sealing effect is relatively low. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides a novel flange joint for connecting pipelines.

[0006] To solve the above technical problems, the present invention provides the following technical solutions: a new type of flange joint for pipeline connection, comprising a first mounting tube and a second mounting tube, the first mounting tube comprising a first connecting tube head, a first movable shell and a first locking ring, the first movable shell and the first locking ring are slidably mounted on the first connecting tube head, the first movable shell and the first locking ring are fixedly connected, the second mounting tube comprises a second connecting tube head, a second movable shell and a second locking ring, the second movable shell and the second locking ring are slidably mounted on the second connecting tube head, the second movable shell and the second locking ring are fixedly connected, the first mounting tube and the second mounting tube are closed and a plug-in locking mechanism is provided at the closing portion of the first mounting tube and the second mounting tube, a safety anti-drop mechanism is provided on the plug-in locking mechanism, and safety limit mechanisms for positioning the first movable shell and the second movable shell are sequentially provided on the first connecting tube head and the second connecting tube head;

[0007] The first connecting pipe head and the second connecting pipe head are arranged in a closed manner, and a sealed cavity is provided at the closed part of the first connecting pipe head and the second connecting pipe head. An inner sleeve and an outer sleeve which are plugged and sealed with each other are arranged in the sealed cavity of the first connecting pipe head and the second connecting pipe head in sequence, and a driving mechanism for pushing the inner sleeve and the outer sleeve to be plugged in is arranged on the first connecting pipe head and the second connecting pipe head;

[0008] The driving mechanism includes a movable groove, a movable block, a first movable ring and a second movable ring. The outer walls of the first connecting pipe head and the second connecting pipe head are both provided with movable grooves, the movable grooves are connected to the sealing cavity, and a movable block is slidably installed in the movable groove. The movable block on the first connecting pipe head is fixedly connected to the inner sleeve, and the movable block on the second connecting pipe head is fixedly connected to the outer sleeve. The first connecting pipe head and the second connecting pipe head are slidably installed with the first movable ring and the second movable ring in turn, the outer diameters of the first movable ring and the second movable ring match the inner diameters of the first locking ring and the second locking ring, the first movable ring and the second movable ring are fixedly connected to the first movable shell and the second movable shell in turn, and a reset mechanism is provided on the first movable ring and the second movable ring.

[0009] As a preferred technical solution of the present invention, a sealing gasket is provided at the closing part of the movable block and the movable groove, and a rubber sealing ring is provided at the plug-in closing part of the inner sleeve and the outer sleeve.

[0010] As a preferred technical solution of the present invention, the plug-in locking mechanism includes an elastic plug and a socket. The first locking ring is located on the side corresponding to the second locking ring and is fixedly installed with an elastic plug. The elastic plug is arranged in a U-shaped structure, and the outer wall of the elastic plug is arranged in a hook-shaped structure. The second locking ring is provided with a socket, the position of the socket corresponds to the elastic plug, and the elastic plug and the socket are plugged into each other.

[0011] As a preferred technical solution of the present invention, the first connecting pipe head and the second connecting pipe head are fixedly installed with docking joints in sequence at the closed parts of the pipe heads, the docking head of the first connecting pipe head is fixedly installed with limiting rods arranged in a circular array, and the docking head of the second connecting pipe head is provided with limiting sockets matching the limiting rods.

[0012] As a preferred technical solution of the present invention, the safety anti-detachment mechanism includes an active cavity, a reset spring and a positioning rod. An active cavity is opened on the second locking ring on the outside of the socket, and a positioning rod is slidably installed in the active cavity. The positioning rod longitudinally penetrates the active cavity and extends into the socket. The positioning rod matches the U-shaped groove of the elastic plug. A baffle is fixedly installed on the outer wall of the positioning rod in the active cavity, and a reset spring is fixedly installed on the baffle. The free end of the reset spring is fixedly connected to the inner wall of the active cavity.

[0013] As a preferred technical solution of the present invention, the safety limit mechanism includes a sliding groove, a rack, teeth, a threaded rod, a toggle plate, a pressure plate, a tension spring, a sliding groove, a slider and a sliding rod. The first movable shell and the second movable shell are both provided with sliding grooves, the number of the sliding grooves is two groups and they are symmetrically arranged, the inner walls on both sides of the sliding groove are fixedly installed with racks, the outer walls of the first connecting pipe head and the second connecting pipe head are located in the sliding groove and have sliding grooves, the inner walls on both sides of the sliding groove are fixedly installed with sliding rods, and the sliding grooves are slidably installed with sliders, the number of the sliders is two groups and they are symmetrical The slider is set on the sliding rod and is slidably connected with the sliding rod. The corresponding side walls of the two groups of sliders are fixedly installed with tension springs. The outer walls of the two groups of sliders are fixedly installed with teeth, and the teeth are meshed with the rack. The front side walls of the two groups of sliders are arranged in an inclined structure. The outer walls of the first connecting pipe head and the second connecting pipe head are located at the interval between the two groups of sliders and are rotatably installed with a threaded rod. A pressure plate is threadedly installed on the threaded rod, and the pressure plate is arranged in a V-shaped structure. The threaded rod extends out of the first movable shell and the second movable shell, and a toggle plate is fixedly installed on the free end of the threaded rod.

[0014] As a preferred technical solution of the present invention, the reset mechanism includes a limit rod and a compression spring. The limit rod is fixedly installed on the outer wall of the joint. The limit rod longitudinally penetrates the first movable ring and the second movable ring. The compression spring is installed on the limit rod. The limit rod extends to the interior of the first movable shell and the second movable shell.

[0015] Compared with the prior art, the present invention can achieve the following beneficial effects:

[0016] 1. In the present invention, a limiting plug rod and a limiting plug hole are provided for positioning, and an elastic plug and a socket are provided at the same time, so that the flange joint can be quickly installed by plugging in during closed installation, and the addition of a safety anti-slip mechanism can effectively prevent the plugged flange joint from falling off after being subjected to tension, and the positioning rod in the safety anti-slip mechanism can effectively limit the elastic plug, thereby improving the safety after locking.

[0017] 2. In the present invention, by arranging the cooperation between the inner sleeve and the outer sleeve, the inner sleeve and the outer sleeve can be plugged into the corresponding connecting pipes, and the rubber ring that is squeezed after closing is cooperated, which further improves the sealing of the flange joint after connection, greatly improving the applicability of the device. At the same time, a sealing gasket is also provided at the closing position of the movable block and the movable groove, which improves the avoidance of leakage of the sealing cavity.

[0018] 3. In the present invention, by using the safety limit mechanism, the movable shell can stop when reaching the closed position during lateral movement, so that the staff can make adjustments according to the connection conditions when making flange connections, thereby improving the convenience of installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention;

[0020] Figure 2 It is a schematic diagram of the joint position structure of the present invention;

[0021] Figure 3 It is a schematic diagram of the split structure of the present invention;

[0022] Figure 4 It is a front cross-sectional structural schematic diagram of the present invention;

[0023] Figure 5 It is a schematic diagram of the position structure of the sliding groove of the present invention;

[0024] Figure 6 It is a schematic diagram of the elastic plug position structure of the present invention;

[0025] Figure 7 It is a schematic diagram of the enlarged structure of the A part of the present invention;

[0026] Figure 8 It is a schematic diagram of the enlarged structure of part B of the present invention;

[0027] Fig. 9 It is a schematic diagram of the enlarged structure of the C part of the present invention.

[0028] Wherein: 1. first connecting pipe head; 2. first movable shell; 3. first locking ring; 4. second locking ring; 5. second movable shell; 6. second connecting pipe head; 7. docking head; 8. movable block; 9. limiting plug hole; 10. movable groove; 11. limiting plug rod; 12. first movable ring; 13. limiting rod; 14. extrusion spring; 15. second movable ring; 16. inner sleeve; 17. sealing cavity; 18. outer sleeve; 19. sliding groove; 20. slider; 21. sliding groove; 22. tension spring; 23. sliding rod; 24. elastic plug; 27. movable cavity; 28. reset spring; 29. ​​socket; 30. positioning rod; 31. rack; 32. toggle plate; 33. pressure plate; 34. teeth; 35. threaded rod; 36. first mounting tube; 37. second mounting tube. DETAILED DESCRIPTION

[0029] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific embodiments, but the following embodiments are only preferred embodiments of the present invention, not all. Based on the embodiments in the implementation mode, other embodiments obtained by those skilled in the art without creative work all belong to the protection scope of the present invention. The experimental methods in the following embodiments, unless otherwise specified, are conventional methods, and the materials, reagents, etc. used in the following embodiments, unless otherwise specified, can all be obtained from commercial channels.

[0030] Embodiment: Figure 1-Figure 9 As shown, a new type of flange joint for pipeline connection includes a first mounting tube 36 and a second mounting tube 37, the first mounting tube 36 includes a first connecting tube head 1, a first movable shell 2 and a first locking ring 3, the first movable shell 2 and the first locking ring 3 are slidably mounted on the first connecting tube head 1, the first movable shell 2 and the first locking ring 3 are fixedly connected, the second mounting tube 37 includes a second connecting tube head 6, a second movable shell 5 and a second locking ring 4, the second movable shell 5 and the second locking ring 4 are slidably mounted on the second connecting tube head 6, the second movable shell 5 and the second locking ring 4 are fixedly connected, the first mounting tube 36 and the second mounting tube 37 are closed and a plug-in locking mechanism is provided at the closing portion of the first mounting tube 36 and the second mounting tube 37, a safety anti-slip mechanism is provided on the plug-in locking mechanism, and a safety limit mechanism for positioning the first movable shell 2 and the second movable shell 5 is sequentially provided on the first connecting tube head 1 and the second connecting tube head 6;

[0031] In actual use, the first mounting tube 36 and the second mounting tube 37 are preferentially docked, so that the staff pushes the second movable shell 5 and the first movable shell 2. At this time, when the second movable shell 5 and the first movable shell 2 move, the first locking ring 3 and the second locking ring 4 are closed. At this time, the first locking ring 3 and the second locking ring 4 trigger the plug-in locking mechanism. When the plug-in locking mechanism is triggered, the safety anti-slip mechanism starts to reinforce and lock the plug-in locking mechanism.

[0032] When the second movable shell 5 and the first movable shell 2 are moving, if the user needs to make adjustments, the safety limit mechanism is driven at this time to complete the limitation of the movement positions of the second movable shell 5 and the first movable shell 2.

[0033] The first connecting pipe head 1 and the second connecting pipe head 6 are arranged in a closed state, and a sealing cavity 17 is provided at the closing part of the first connecting pipe head 1 and the second connecting pipe head 6. The sealing cavities 17 of the first connecting pipe head 1 and the second connecting pipe head 6 are provided with an inner sleeve 16 and an outer sleeve 18 which are plugged and sealed with each other in sequence, and the first connecting pipe head 1 and the second connecting pipe head 6 are provided with a driving mechanism for pushing the inner sleeve 16 and the outer sleeve 18 to be plugged;

[0034] When the second movable shell 5 and the first movable shell 2 move, the driving mechanism is driven to move, causing the inner sleeve 16 and the outer sleeve 18 to move, so that the outer sleeve 18 is inserted into the first connecting pipe head 1, and the inner sleeve 16 is inserted into the second connecting pipe head 6, completing the sealing operation.

[0035] The driving mechanism includes a movable groove 10, a movable block 8, a first movable ring 12 and a second movable ring 15. The outer walls of the first connecting pipe head 1 and the second connecting pipe head 6 are both provided with movable grooves 10, and the movable groove 10 is connected to the sealing chamber 17. The movable block 8 is slidably installed in the movable groove 10. The movable block 8 on the first connecting pipe head 1 is fixedly connected to the inner sleeve 16, and the movable block 8 on the second connecting pipe head 6 is fixedly connected to the outer sleeve 18. The first movable ring 12 and the second movable ring 15 are slidably installed on the first connecting pipe head 1 and the second connecting pipe head 6 in turn. The outer diameters of the first movable ring 12 and the second movable ring 15 match the inner diameters of the first locking ring 3 and the second locking ring 4. The first movable ring 12 and the second movable ring 15 are fixedly connected to the first movable shell 2 and the second movable shell 5 in turn, and a reset mechanism is provided on the first movable ring 12 and the second movable ring 15.

[0036] When the first movable ring 12 and the second movable ring 15 are pushed by the first movable shell 2 and the second movable shell 5, the first movable ring 12 and the second movable ring 15 squeeze the movable block 8, causing the movable block 8 to move longitudinally in the movable groove 10, thereby driving the inner sleeve 16 and the outer sleeve 18 to be plugged into each other.

[0037] like Figure 3 and Figure 4 As shown, a sealing gasket is provided at the closing portion between the movable block 8 and the movable groove 10, and a rubber sealing ring is provided at the plug-in closing portion between the inner sleeve 16 and the outer sleeve 18.

[0038] The use of the sealing ring and the sealing gasket enables the inner sleeve 16 and the outer sleeve 18 to be effectively squeezed after closing, thereby completing the encryption of the gap and avoiding leakage.

[0039] like Figure 6 As shown, the plug-in locking mechanism includes an elastic plug 24 and a socket 29. The first locking ring 3 is fixedly installed with an elastic plug 24 on the side corresponding to the second locking ring 4. The elastic plug 24 is arranged in a U-shaped structure, and the outer wall of the elastic plug 24 is arranged in a hook-shaped structure. The second locking ring 4 is provided with a socket 29. The position of the socket 29 corresponds to the elastic plug 24, and the elastic plug 24 and the socket 29 are plugged together.

[0040] When the first locking ring 3 and the second locking ring 4 are closed, the elastic plug 24 is inserted into the socket 29 , so that the protrusion on the outside of the elastic plug 24 is located outside the bottom of the second locking ring 4 , thereby causing the elastic plug 24 to complete the locking with the second locking ring 4 .

[0041] like Figure 3 As shown, the first connecting pipe head 1 and the second connecting pipe head 6 are fixedly installed at the closed parts of the pipe heads in sequence, and the butt joints 7 of the first connecting pipe head 1 are fixedly installed with limiting plug rods 11 arranged in a circular array, and the butt joint 7 of the second connecting pipe head 6 is provided with limiting sockets 9 matching the limiting plug rods 11.

[0042] When the first connecting pipe head 1 and the second connecting pipe head 6 are connected, the user inserts the limiting plug rod 11 into the limiting plug hole 9 to complete the initial connection between the first connecting pipe head 1 and the second connecting pipe head 6 .

[0043] like Figure 6 and 9 As shown, the safety anti-slip mechanism includes an active cavity 27, a reset spring 28 and a positioning rod 30. An active cavity 27 is opened on the second locking ring 4 on the outside of the socket 29. A positioning rod 30 is slidably installed in the active cavity 27. The positioning rod 30 longitudinally penetrates the active cavity 27 and extends into the socket 29. The positioning rod 30 matches the U-shaped groove of the elastic plug 24. A baffle is fixedly installed on the outer wall of the positioning rod 30 in the active cavity 27, and a reset spring 28 is fixedly installed on the baffle. The free end of the reset spring 28 is fixedly connected to the inner wall of the active cavity 27.

[0044] The elastic plug 24 is inserted into the socket 29 , and the positioning rod 30 is inserted into the groove of the elastic plug 24 , so that the elastic plug 24 can be prevented from falling off due to pressure.

[0045] like Figure 5 , Figure 7 and Figure 8 As shown, the safety limit mechanism includes a sliding groove 19, a rack 31, teeth 34, a threaded rod 35, a toggle plate 32, a pressure plate 33, a tension spring 22, a sliding groove 21, a slider 20 and a sliding rod 23. The first movable shell 2 and the second movable shell 5 are both provided with sliding grooves 19. The number of the sliding grooves 19 is two groups and they are symmetrically arranged. The inner walls on both sides of the sliding grooves 19 are fixedly installed with racks 31. The outer side walls of the first connecting pipe head 1 and the second connecting pipe head 6 are located in the sliding groove 19 and are provided with sliding grooves 21. The inner walls on both sides of the sliding grooves 21 are fixedly installed with sliding rods 23. The sliding rods 20 are slidably installed in the sliding rods 23. The number of the sliding rods 20 is two groups and they are symmetrically arranged. The block 20 is sleeved on the slide rod 23 and is slidably connected with the slide rod 23. The corresponding side walls of the two groups of sliders 20 are fixedly installed with tension springs 22. The outer side walls of the two groups of sliders 20 are fixedly installed with teeth 34. The teeth 34 are meshed with the rack 31. The front side walls of the two groups of sliders 20 are arranged in an inclined structure. The outer side walls of the first connecting pipe head 1 and the second connecting pipe head 6 are rotatably installed at the interval between the two groups of sliders 20. A pressure plate 33 is threadedly installed on the threaded rod 35. The pressure plate 33 is arranged in a V-shaped structure. The threaded rod 35 extends out of the first movable shell 2 and the second movable shell 5. The free end of the threaded rod 35 is fixedly installed with a toggle disk 32.

[0046] When the second movable shell 5 and the first movable shell 2 move, the first locking ring 3 and the second locking ring 4 are closed with the docking joint 7. At this time, the user rotates the dial 32 to rotate the threaded rod 35. At this time, the pressure plate 33 moves longitudinally to squeeze the slider 20, so that the slider 20 drives the teeth 34 to engage with the rack 31.

[0047] like Figure 4 As shown, the reset mechanism includes a limit rod 13 and a compression spring 14. The limit rod 13 is fixedly installed on the outer wall of the joint 7. The limit rod 13 longitudinally penetrates the first movable ring 12 and the second movable ring 15. The compression spring 14 is mounted on the limit rod 13. The limit rod 13 extends to the interior of the first movable shell 2 and the second movable shell 5.

[0048] The compression spring 14 compresses the first movable ring 12 and the second movable ring 15, so that the inner sleeve 16 and the outer sleeve 18 can be retracted into the first connecting pipe head 1 and the second connecting pipe head 6 after being reset when not being installed.

[0049] Working principle:

[0050] When in use, when the user needs to dock the first mounting tube 36 and the second mounting tube 37, the two sets of docking joints 7 are docked first, so that the limiting plug rod 11 is inserted into the limiting plug hole 9. At this time, the user pushes the first movable shell 2 and the second movable shell 5 until the first movable ring 12 and the second movable ring 15 are closed with the corresponding docking joints 7. At this time, the first locking ring 3 and the second locking ring 4 are also closed, thereby completing the insertion of the elastic plug 24 into the socket 29 and completing the fixation. When the first movable shell 2 and the second movable shell 5 move, the first movable ring 12 and the second movable ring 15 drive the movable block 8 to move longitudinally, so that the inner sleeve 16 and the outer sleeve 18 are plugged into each other, and the sealing operation is completed at the same time. After the complete docking is completed, the user turns the dial 32, so that the teeth 34 engage with the rack 31, and further fixes and limits the first movable shell 2 and the second movable shell 5.

[0051] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited thereto, and various changes can be made within the knowledge scope of technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A flange joint for connecting pipes, comprising a first mounting pipe (36) and a second mounting pipe (37), characterized in that: The first mounting tube (36) comprises a first connecting tube head (1), a first movable shell (2) and a first locking ring (3), the first movable shell (2) and the first locking ring (3) are slidably mounted on the first connecting tube head (1), the first movable shell (2) and the first locking ring (3) are fixedly connected, the second mounting tube (37) comprises a second connecting tube head (6), a second movable shell (5) and a second locking ring (4), the second movable shell (5) and the second locking ring (4) are slidably mounted on the second connecting tube head (6), the second movable shell (5) and the second locking ring (4) are fixedly connected, the first mounting tube (36) and the second mounting tube (37) are closed, and a plug-in locking mechanism is provided at the closed position of the first mounting tube (36) and the second mounting tube (37), the plug-in locking mechanism is provided with a safety anti-dropping mechanism, and safety limit mechanisms for positioning the first movable shell (2) and the second movable shell (5) are provided on the first connecting tube head (1) and the second connecting tube head (6) in sequence; The first connecting pipe head (1) and the second connecting pipe head (6) are arranged in a closed manner, and a sealed cavity (17) is provided at the closed portion of the first connecting pipe head (1) and the second connecting pipe head (6). An inner sleeve (16) and an outer sleeve (18) which are plugged and sealed with each other are arranged in sequence in the sealed cavities (17) of the first connecting pipe head (1) and the second connecting pipe head (6). A driving mechanism for pushing the inner sleeve (16) and the outer sleeve (18) to be plugged together is arranged on the first connecting pipe head (1) and the second connecting pipe head (6); The driving mechanism comprises a movable groove (10), a movable block (8), a first movable ring (12) and a second movable ring (15); the outer walls of the first connecting pipe head (1) and the second connecting pipe head (6) are both provided with a movable groove (10); the movable groove (10) is communicated with the sealing cavity (17); a movable block (8) is slidably mounted in the movable groove (10); the movable block (8) on the first connecting pipe head (1) is fixedly connected to the inner sleeve (16); the movable block (8) on the second connecting pipe head (6) is fixedly connected to the outer sleeve (18); The first connecting pipe head (1) and the second connecting pipe head (6) are slidably mounted with a first movable ring (12) and a second movable ring (15) in sequence, the outer diameters of the first movable ring (12) and the second movable ring (15) match the inner diameters of the first locking ring (3) and the second locking ring (4), the first movable ring (12) and the second movable ring (15) are fixedly connected to the first movable shell (2) and the second movable shell (5) in sequence, and a reset mechanism is arranged on the first movable ring (12) and the second movable ring (15).

2. A flange joint for pipe connection according to claim 1, characterized in that: A sealing gasket is provided at the closing position between the movable block (8) and the movable groove (10), and a rubber sealing ring is provided at the plug-in closing position between the inner sleeve (16) and the outer sleeve (18).

3. The flange joint for pipe connection according to claim 1, characterized in that: The plug-in locking mechanism comprises an elastic plug (24) and a socket (29); the first locking ring (3) is fixedly mounted with the elastic plug (24) on the side corresponding to the second locking ring (4); the elastic plug (24) is arranged in a U-shaped structure; the second locking ring (4) is provided with a socket (29); the position of the socket (29) corresponds to the elastic plug (24), and the elastic plug (24) and the socket (29) are plugged together.

4. The flange joint for pipe connection according to claim 1, characterized in that: The first connecting pipe head (1) and the second connecting pipe head (6) are fixedly mounted with butt joints (7) at the closed positions of the pipe heads, the butt joint (7) of the first connecting pipe head (1) is fixedly mounted with limiting plug rods (11) arranged in a circular array, and the butt joint (7) of the second connecting pipe head (6) is provided with limiting plug holes (9) matching the limiting plug rods (11).

5. The flange joint for pipe connection according to claim 1, characterized in that: The safety anti-drop mechanism comprises an active cavity (27), a reset spring (28) and a positioning rod (30). The second locking ring (4) is provided with an active cavity (27) on the outer side of the socket (29). A positioning rod (30) is slidably mounted in the active cavity (27). The positioning rod (30) longitudinally penetrates the active cavity (27) and extends into the socket (29). The positioning rod (30) matches the U-shaped groove of the elastic plug (24). A baffle is fixedly mounted on the outer side wall of the positioning rod (30) in the active cavity (27). A reset spring (28) is fixedly mounted on the baffle. The free end of the reset spring (28) is fixedly connected to the inner side wall of the active cavity (27).

6. The flange joint for pipe connection according to claim 1, characterized in that: The safety limit mechanism comprises a sliding groove (19), a rack (31), teeth (34), a threaded rod (35), a toggle plate (32), a pressure plate (33), a tension spring (22), a sliding groove (21), a slider (20) and a slider (23). The first movable shell (2) and the second movable shell (5) are both provided with sliding grooves (19). The number of the sliding grooves (19) is two groups and they are symmetrically arranged. The inner walls on both sides of the sliding grooves (19) are fixedly mounted with racks (31). The outer walls of the first connecting pipe head (1) and the second connecting pipe head (6) are located in the sliding grooves (19) and are provided with sliding grooves (21). The inner walls on both sides of the sliding grooves (21) are fixedly mounted with sliders (23). The sliding grooves (21) are slidably mounted with sliders (20). The number of the sliders (20) is two groups and they are symmetrically arranged. The slider (20) is sleeved on the slider (23) and is slidably connected to the slider (23). Tension springs (22) are fixedly installed on the corresponding side walls of the two groups of sliders (20). Teeth (34) are fixedly installed on the outer side walls of the two groups of sliders (20). The teeth (34) are meshed with the rack (31). The front side walls of the two groups of sliders (20) are arranged in an inclined structure. The outer side walls of the first connecting pipe head (1) and the second connecting pipe head (6) are rotatably installed with a threaded rod (35) at the interval between the two groups of sliders (20). A pressure plate (33) is threadedly installed on the threaded rod (35). The pressure plate (33) is arranged in a V-shaped structure. The threaded rod (35) extends outside the first movable shell (2) and the second movable shell (5). A toggle plate (32) is fixedly installed on the free end of the threaded rod (35).

7. A flange joint for pipe connection according to any one of claims 1 or 4, characterized in that: The reset mechanism comprises a limit rod (13) and a compression spring (14); the limit rod (13) is fixedly mounted on the outer wall of the joint (7); the limit rod (13) longitudinally penetrates the first movable ring (12) and the second movable ring (15); the compression spring (14) is sleeved and mounted on the limit rod (13); the limit rod (13) extends to the inside of the first movable shell (2) and the second movable shell (5).

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