Internal support mechanism for large pipe fittings

Abstract

The present invention discloses an internal support mechanism for a large pipe fitting, and relates to the technical field of pipeline support, comprising a mechanism ring, wherein at least three groups of support feet are equidistantly arranged on the side surface of the mechanism ring, and the mechanism ring adjusts the angle of the support feet along the axial direction of the large pipe fitting by hydraulic pressure, so that the support feet form a triangular structure along the axial direction of the large pipe fitting, and a pressure threshold is preset for the support feet. When the pressure value of the large pipe fitting applied to the support feet is greater than the pressure threshold, the support feet automatically release the hydraulic pressure applied to the support feet by the mechanism ring, and the support feet absorb the deformation potential energy of the large pipe fitting, which can weaken the deformation of the large pipe fitting on the one hand, and prevent the mechanism ring and the support feet from applying excessive pressure to other parts of the large pipe fitting on the other hand, thereby ensuring that the deformation of the large pipe fitting is controlled within a set range.

Description

Technical Field

[0001] The invention relates to the technical field of pipeline support, and in particular to an internal support mechanism for a large pipe fitting. Background Art

[0002] The existing large-scale pipe internal support mechanism, for example, the pipe internal support device disclosed in the Chinese patent application with publication number CN110375142A, comprises a support tube; a plurality of support legs, the plurality of support legs are arranged around the axial direction of the support tube, the first end of each support leg can be slidably inserted in the support tube, and the second end is used to support the inner wall of the pipe;

[0003] The in-pipe support device has a significant radial support effect on the pipe, but an insufficient axial support effect on the pipe. When the impact force of the liquid inside the pipe is too large, the in-pipe support device is prone to deformation, thereby weakening the support effect of the in-pipe support device. Summary of the invention

[0004] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide an internal support mechanism for a large pipe fitting to solve the problem in the prior art that the internal support device of the pipeline has insufficient supporting force when responding to the axial pressure impact inside the pipeline, and the internal support device of the pipeline is prone to deformation, resulting in a weakened supporting effect of the internal support device of the pipeline.

[0005] The purpose of the present invention can be achieved through the following technical solutions:

[0006] Specifically, a support mechanism is provided inside a large pipe, including a mechanism ring, and at least three groups of support feet are equidistantly arranged on the side of the mechanism ring. The mechanism ring hydraulically adjusts the angle of the support feet along the axial direction of the large pipe, so that the support feet form a triangular structure along the axial direction of the large pipe, and a pressure threshold is preset for the support feet. When the pressure value of the large pipe applied to the support feet is greater than the pressure threshold, the support feet automatically release the hydraulic pressure applied to the support feet by the mechanism ring.

[0007] As a further solution of the present invention: the mechanism ring includes a ring body, at least three sets of rotating seats are fixedly connected to the side of the ring body, a rotating groove is opened on the inner side of the ring body, and a first rotating circle and a second rotating circle are arranged in the rotating groove.

[0008] As a further solution of the present invention: the supporting foot includes two rotating arms, one end of each rotating arm is fixedly connected with a rotating shaft, the rotating shaft is used to cooperate with the rotating seat, and the other end of each rotating arm is plugged with a telescopic arm.

[0009] As a further solution of the present invention: a roller is installed at one end of the telescopic arm away from the rotating arm through a rotating shaft.

[0010] As a further solution of the present invention: a connecting seat is fixedly connected to the middle position of the side of the two rotating arms, and a hydraulic cylinder is movably connected between the two groups of connecting seats.

[0011] As a further solution of the present invention: thread grooves are provided on the inner sides of the first rotating circle and the second rotating circle, the thread grooves on the inner side of the first rotating circle are engaged with the first driving shaft, and the thread grooves on the inner side of the second rotating circle are engaged with the second driving shaft.

[0012] As a further solution of the present invention: a plurality of sliding arc-shaped gear rods are arranged inside the circular ring body, one end of the arc-shaped gear rod is fixedly connected to a piston, and an oil chamber is opened inside the circular ring body near the piston. The oil chambers are divided into two groups, one group of oil chambers is connected to the inner cavity of the rotating arm through an oil pipe, and the other group of oil chambers is connected to the inner cavity of the hydraulic cylinder through an oil pipe.

[0013] As a further solution of the present invention: a driving gear is installed with a rotating shaft near the arc-shaped gear rod inside the circular ring body, and the driving gear is meshed with the arc-shaped gear rod. The driving gear is divided into two groups, and the rotating shaft of one group of driving gears is connected to the first driving shaft through a universal joint, and the rotating shaft of the other group of driving gears is connected to the second driving shaft through a universal joint.

[0014] As a further solution of the present invention: a plurality of guide wheels and two sets of fastening mechanisms are installed inside the rotating groove near a position between the first rotating circle and the second rotating circle, and the two sets of fastening mechanisms are respectively used to limit the rotation of the first rotating circle and the second rotating circle.

[0015] As a further solution of the present invention: the fastening mechanism includes a mechanism housing, one end of the mechanism housing is threadedly connected to a nut, one end of the inner side of the nut is rotatably connected to a push block, and a sliding extrusion block is provided on the side of the push block away from the nut.

[0016] Beneficial effects of the present invention:

[0017] 1. In the present invention, since the triangular structure formed by the supporting feet is along the axial direction of the large pipe fitting, when the large pipe fitting is transporting the solution, the mechanism ring can be stabilized on the inner wall of the large pipe fitting through the supporting feet. At the same time, the mechanism ring also has a high impact resistance, ensuring that the mechanism ring and the supporting feet are more stable and firm as a whole, and will not deform or loosen. A pressure threshold is preset for the supporting feet. When the pressure value of the large pipe fitting applied to the supporting feet is greater than the pressure threshold, the supporting feet automatically release the hydraulic pressure applied by the mechanism ring to the supporting feet, that is, the supporting feet absorb the deformation potential energy of the large pipe fitting. On the one hand, it can weaken the deformation of the large pipe fitting, and on the other hand, it prevents the mechanism ring and the supporting feet from applying excessive pressure to other parts of the large pipe fitting, thereby ensuring that the deformation of the large pipe fitting is controlled within the set range.

[0018] 2. In the present invention, the overall length of the rotating arm and the telescopic arm and the angle between the two rotating arms can be adjusted by rotating the first rotating circle and the second rotating circle, so that the internal support mechanism of the large pipe fitting can fit the large pipe fittings of different diameters, thereby improving the applicability of the internal support mechanism of the large pipe fitting and facilitating the installation and disassembly of the internal support mechanism of the large pipe fitting.

[0019] 3. In the present invention, through the fastening mechanism, when it is necessary to fix the first rotating circle or the second rotating circle, the nut can be rotated, and the rotating nut moves toward the inside of the mechanism housing. During the movement of the nut, the nut will drive the pushing block. The pushing block and the extrusion block are in contact through the inclined surface. Therefore, when the pushing block acts on the extrusion block, the extrusion block will move toward the outside of the mechanism housing, that is, toward the outer side surface of the first rotating circle or the inner side surface of the second rotating circle. When the end surface of the extrusion block contacts the outer side surface of the first rotating circle or the inner side surface of the second rotating circle, the first rotating circle or the second rotating circle will be fixed through the cooperation of the raised teeth and the tooth grooves, ensuring that the first rotating circle or the second rotating circle will not rotate. When it is necessary to rotate the first rotating circle or the second rotating circle, the nut can be rotated in the opposite direction, and the rotating nut moves toward the outside of the mechanism housing. During the movement of the nut, the nut will drive the pushing block. A spring is installed at the inner end of the extrusion block close to the mechanism housing. The elastic force of the spring will act on the extrusion block, causing the extrusion block to automatically retract, thereby releasing the fixation of the first rotating circle or the second rotating circle. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention will be further described below in conjunction with the accompanying drawings.

[0021] Figure 1 It is a structural schematic diagram of the internal support mechanism of a large pipe fitting of the present invention;

[0022] Figure 2 It is a front view of the internal support mechanism of a large pipe of the present invention;

[0023] Figure 3 It is a schematic structural diagram of the circular ring body in the present invention;

[0024] Figure 4 It is a schematic diagram of the structure of the supporting foot in the present invention;

[0025] Figure 5 It is a schematic diagram of the structure of the first rotating circle and the second rotating circle in the present invention;

[0026] Figure 6 It is a schematic diagram of the internal structure of the circular ring body in the present invention;

[0027] Figure 7 It is a partial structural schematic diagram of the first rotating circle and the second rotating circle in the present invention;

[0028] Figure 8 It is a structural schematic diagram of the fastening mechanism in the present invention;

[0029] Fig. 9 It is a partial cross-sectional view of the rotating arm and the telescopic arm in the present invention.

[0030] Reference numerals:

[0031] 1. Mechanism ring; 11. Ring body; 12. Rotating seat; 13. Rotating groove; 131. Guide wheel; 132. Fastening mechanism; 1321. Mechanism housing; 1322. Nut; 1323. Push block; 1324. Extrusion block; 14. First rotating circle; 141. First drive shaft; 15. Second rotating circle; 151. Second drive shaft; 16. Drive gear; 17. Arc gear rod; 18. Piston; 19. Oil chamber; 2. Support foot; 21. Rotating arm; 211. Hydraulic chamber; 22. Telescopic arm; 221. Pressure valve; 222. Pressure relief chamber; 23. Roller; 24. Connecting seat; 25. Hydraulic cylinder. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] Example 1

[0034] like Figure 1 - Fig. 9 As shown, the present invention discloses a large pipe internal support mechanism, including a mechanism ring 1, and at least three groups of support feet 2 are evenly arranged on the side of the mechanism ring 1. Figure 1 and Figure 2 For example, the number of supporting feet 2 is set to three groups, so that the three groups of supporting feet 2 need to be installed at equal distances on the side of the mechanism ring 1. When the large pipe internal support mechanism is used to support the large pipe, the mechanism ring 1 can be stably supported on the inner wall of the large pipe through the three groups of supporting feet 2, thereby achieving the inner wall support effect of the large pipe and improving the deformation resistance of the large pipe. The mechanism ring 1 adjusts the angle of the supporting feet 2 along the axial direction of the large pipe by hydraulic pressure, so that the supporting feet 2 form a triangular structure along the axial direction of the large pipe, such as Figure 1As shown, since the triangular structure formed by the support foot 2 is along the axial direction of the large pipe, when the large pipe is transporting the solution, the mechanism ring 1 can be stabilized on the inner wall of the large pipe through the support foot 2. At the same time, the mechanism ring 1 also has a high impact resistance, ensuring that the mechanism ring 1 and the support foot 2 are more stable and firm as a whole, and will not deform or loosen. A pressure threshold is preset for the support foot 2. When the pressure value of the large pipe on the support foot 2 is greater than the pressure threshold, the support foot 2 automatically releases the hydraulic pressure applied by the mechanism ring 1 to the support foot 2. It should be noted that if the support foot 2 does not have a preset pressure threshold, when the outside of the large pipe is subjected to a very large force, the force will not only cause the large pipe to deform, but also cause the inner wall of the large pipe to The mechanism ring 1 and the support foot 2 of the upper support are deformed, and when the mechanism ring 1 and the support foot 2 are deformed, they will inevitably act on other parts of the large pipe, causing the large pipe to further deform, and greatly weakening the supporting effect of the mechanism ring 1 and the support foot 2. After the pressure threshold is preset on the support foot 2, when the outside of the large pipe is subjected to a very large force, the force will inevitably cause the large pipe to deform, but the support foot 2 can automatically release the hydraulic pressure applied by the mechanism ring 1 to the support foot 2, that is, the support foot 2 will absorb the deformation potential energy of the large pipe. On the one hand, it can weaken the deformation of the large pipe, and on the other hand, it can prevent the mechanism ring 1 and the support foot 2 from applying excessive pressure to other parts of the large pipe, thereby ensuring that the deformation of the large pipe is controlled within the set range.

[0035] The mechanism ring 1 controls the support foot 2 through hydraulic pressure, so that the support foot 2 acts on the inner wall of the large pipe, so that the support foot 2 is firmly fixed and not easy to loosen.

[0036] Example 2

[0037] like Figure 3 As shown, the mechanism ring 1 includes a ring body 11, and at least three groups of rotating seats 12 are fixedly connected to the side of the ring body 11. A rotating groove 13 is opened on the inner side of the ring body 11, and a first rotating circle 14 and a second rotating circle 15 are arranged in the rotating groove 13. It should be noted that annular grooves matching the first rotating circle 14 and the second rotating circle 15 are opened inside the rotating groove 13 near the first rotating circle 14 and the second rotating circle 15, and the first rotating circle 14 and the second rotating circle 15 can rotate freely in the annular grooves respectively.

[0038] like Figure 3 and Figure 4As shown, the supporting foot 2 includes two rotating arms 21, which are symmetrically arranged. One end of the two rotating arms 21 is fixedly connected with a rotating shaft, and the rotating shaft is used to cooperate with the rotating seat 12. The other end of the two rotating arms 21 is plugged with a telescopic arm 22. It should be noted that the rotating arm 21 is installed on the side of the circular ring body 11 through the cooperation of the rotating shaft and the rotating seat 12, and can rotate freely on the side of the circular ring body 11.

[0039] like Figure 4 As shown, the end of the telescopic arm 22 away from the rotating arm 21 is equipped with a roller 23 through a rotating shaft. It should be noted that when the mechanism ring 1 adjusts the angle of the supporting foot 2 along the axial direction of the large pipe by hydraulic pressure, that is, the angle between the two rotating arms 21, the two rotating arms 21 will drive the telescopic arm 22 to move, and the end of the telescopic arm 22 away from the rotating arm 21 needs to be supported on the inner wall of the large pipe, so the end of the telescopic arm 22 away from the rotating arm 21 will contact the inner wall of the large pipe. After the roller 23 is installed at one end of the rotating arm 21 through the rotating shaft, the roller 23 will reduce the friction between the telescopic arm 22 and the inner wall of the large pipe, making the telescopic arm 22 easy to move. It should also be noted that one of the rollers 23 on the two telescopic arms 22 can be fixed. In this way, when adjusting the angle between the two rotating arms 21, the position of one of the telescopic arms 22 can be ensured to remain unchanged, while the other telescopic arm 22 moves on the inner wall of the large pipe, thereby realizing the adjustment of the angle between the two rotating arms 21.

[0040] The wheel surface of the roller 23 can be set to be arc-shaped and match the inner wall of the large pipe fitting, so that the contact area between the roller 23 and the large pipe fitting can be increased, and the friction between the roller 23 and the inner wall of the large pipe fitting can be improved.

[0041] like Figure 3 and Figure 4 As shown, the middle part of the side of the two rotating arms 21 is fixedly connected with a connecting seat 24, and a hydraulic cylinder 25 is movably connected between the two groups of connecting seats 24. It should be noted that one end of the hydraulic cylinder 25 is movably connected to one of the connecting seats 24, and the other end of the hydraulic cylinder 25 is movably connected to the other connecting seat 24 through a hydraulic rod. When in use, the hydraulic cylinder 25 is turned on, and the output end of the hydraulic cylinder 25 will drive the hydraulic rod to control the distance between the two connecting seats 24 through the hydraulic rod. When the distance between the two connecting seats 24 increases, the angle between the two rotating arms 21 increases, and when the distance between the two connecting seats 24 decreases, the angle between the two rotating arms 21 decreases. Therefore, the angle between the two rotating arms 21 can be controlled by the hydraulic cylinder 25.

[0042] like Figure 5As shown, the inner side surfaces of the first rotating circle 14 and the second rotating circle 15 are provided with a thread groove, and the thread groove on the inner side surface of the first rotating circle 14 is engaged with the first drive shaft 141, and the thread groove on the inner side surface of the second rotating circle 15 is engaged with the second drive shaft 151. Since the thread groove on the inner side surface of the first rotating circle 14 is engaged with the first drive shaft 141, when the first rotating circle 14 rotates, the first rotating circle 14 will drive the first drive shaft 141 to rotate, and when the first rotating circle 14 is stationary, the first drive shaft 141 will also be stationary. Since the thread groove on the inner side surface of the second rotating circle 15 is engaged with the second drive shaft 151, when the second rotating circle 15 rotates, the second rotating circle 15 will drive the second drive shaft 151 to rotate, and when the second rotating circle 15 is stationary, the second drive shaft 151 will also be stationary.

[0043] like Figure 1 - Figure 6 As shown, a plurality of sliding arc-shaped gear rods 17 are arranged inside the circular ring body 11, one end of the arc-shaped gear rod 17 is fixedly connected to a piston 18, and an oil chamber 19 is provided inside the circular ring body 11 near the piston 18. It should be noted that the curvature of the arc-shaped gear rod 17 and the piston 18 is consistent with that of the circular ring body 11, so that the arc-shaped gear rod 17 can move freely inside the circular ring body 11. When the arc-shaped gear rod 17 moves, the arc-shaped gear rod 17 drives the piston 18 to move, and the moving piston 18 will move inside the oil chamber 19 to squeeze the hydraulic oil inside the oil chamber 19. The oil chamber 19 is divided into two groups, one of which is connected to the inner cavity of the rotating arm 21 through an oil pipe, and the other is connected to the inner cavity of the hydraulic cylinder 25 through an oil pipe. It should be noted that the functions of the two groups of oil chambers 19 are different. The oil chamber 19 connected to the inner cavity of the rotating arm 21 is used to control the position of the telescopic arm 22. When the oil chamber 19 injects hydraulic oil into the inner cavity of the rotating arm 21 through the oil pipe, The hydraulic oil will squeeze the telescopic arm 22, causing the telescopic arm 22 to move toward the outer end of the rotating arm 21, thereby increasing the overall length of the rotating arm 21 and the telescopic arm 22. When the oil chamber 19 sucks hydraulic oil into the inner cavity of the rotating arm 21 through the oil pipe, the hydraulic oil in the inner cavity of the rotating arm 21 will be reduced, causing the telescopic arm 22 to move toward the inner end of the rotating arm 21, thereby reducing the overall length of the rotating arm 21 and the telescopic arm 22. By controlling the overall length of the rotating arm 21 and the telescopic arm 22, the internal support mechanism of the large pipe fitting can be adapted to large pipe fittings of different diameters, thereby improving the applicability of the internal support mechanism of the large pipe fitting. It should also be noted that the group of oil chambers 19 can simultaneously inject or draw hydraulic oil into the inner cavities of multiple rotating arms 21 to ensure that the oil pressure of the hydraulic oil in the inner cavities of multiple rotating arms 21 is the same, so that the overall length of the rotating arm 21 and the telescopic arm 22 on the side of the annular body 11 is the same, so that the annular body 11 can be located at the center of the inner cavity of the large pipe fitting.

[0044] like Figure 5 and Figure 6 As shown, a driving gear 16 is installed at a position near the arc-shaped gear rod 17 inside the circular body 11 through a rotating shaft. The driving gear 16 meshes with the arc-shaped gear rod 17. The driving gear 16 is divided into two groups, wherein the rotating shaft of one group of driving gears 16 is connected to the first driving shaft 141 through a universal joint, and the other group of driving gears 16 is connected to the second driving shaft 151 through a universal joint. It should be noted that when the first rotating circle 14 rotates, the rotating first rotating circle 14 will drive the first driving shaft 141 to rotate, and the rotating first driving shaft 141 can be driven by the universal joint. One of the drive gears 16 is driven to rotate, and the size and type of the universal joint are adaptively selected by technical personnel in this field according to the internal space of the circular ring body 11. The rotating drive gear 16 will drive the arc-shaped gear rod 17 to move the arc-shaped gear rod 17, and the arc-shaped gear rod 17 will drive the piston 18 to move. The moving piston 18 will move inside the oil chamber 19 to squeeze the hydraulic oil inside the oil chamber 19. It should be noted that the oil chamber 19 corresponding to the first rotating circle 14 is connected to the inside of the rotating arm 21, so the first rotating circle 14 can control the position of the telescopic arm 22.

[0045] When the second rotating circle 15 rotates, the rotating second rotating circle 15 will drive the second driving shaft 151 to rotate, and the rotating second driving shaft 151 can drive another set of driving gears 16 to rotate through the universal joint, and the rotating driving gear 16 will drive the arc-shaped gear rod 17 to move the arc-shaped gear rod 17, and the arc-shaped gear rod 17 will drive the piston 18 to move, and the moving piston 18 will move inside the oil chamber 19 to squeeze the hydraulic oil inside the oil chamber 19. It should be noted that the oil chamber 19 corresponding to the second rotating circle 15 is connected to the hydraulic cylinder 25, so the second rotating circle 15 can control the angle between the two rotating arms 21.

[0046] like Figure 7 As shown, a plurality of guide wheels 131 and two sets of fastening mechanisms 132 are installed inside the rotating groove 13 near the position between the first rotating circle 14 and the second rotating circle 15. The two sets of fastening mechanisms 132 are respectively used to limit the rotation of the first rotating circle 14 and the second rotating circle 15. It should be noted that since a plurality of guide wheels 131 are installed between the first rotating circle 14 and the second rotating circle 15, the first rotating circle 14 and the second rotating circle 15 can rotate freely inside the rotating groove 13. It should also be noted that the plurality of guide wheels 131 are equidistantly arranged.

[0047] like Figure 1 - Fig. 9As shown, a hydraulic chamber 211 matching the telescopic arm 22 is provided inside the rotating arm 21, and the oil chamber 19 is connected to the hydraulic chamber 211 through an oil pipe. A pressure relief chamber 222 is provided at one end of the telescopic arm 22 close to the hydraulic chamber 211, and a pressure valve 221 is installed at the port of the pressure relief chamber 222. The rated pressure of the pressure valve 221 is the preset pressure threshold of the supporting foot 2. When the pressure value applied to the pressure valve 221 is greater than the pressure threshold, the pressure valve 221 will open, so that the hydraulic oil in the hydraulic chamber 211 can enter the pressure relief chamber 222 through the pressure valve 221, so that the telescopic arm 22 can shrink a certain distance toward the inside of the rotating arm 21. When the pressure value applied to the pressure valve 221 is less than or equal to the pressure threshold, the pressure valve 221 will automatically close to ensure that the hydraulic pressure in the hydraulic chamber 211 will not change, so that the overall support of the mechanism ring 1 and the supporting foot 2 will not loosen. It should be noted that the size of the pressure threshold is adaptively selected by technical personnel in this field according to the specifications and materials of large pipe fittings.

[0048] Example 3

[0049] like Figure 8 As shown, the fastening mechanism 132 includes a mechanism housing 1321, one end of the mechanism housing 1321 is threadedly connected to a nut 1322, and the inner end of the nut 1322 is rotatably connected to a pushing block 1323, and a sliding extrusion block 1324 is provided on the side of the pushing block 1323 away from the nut 1322. It should be noted that a hexagonal groove is provided at the outer end of the nut 1322, and the moving direction of the extrusion block 1324 corresponds to the first rotating circle 14 and the second rotating circle 15 one by one, that is, one of the extrusion blocks 1324 moves toward the outer side surface of the first rotating circle 14, and the end face of the extrusion block 1324 fits with the outer side surface of the first rotating circle 14, and the other extrusion block 1324 moves toward the inner side surface of the second rotating circle 15, and the end face of the extrusion block 1324 fits with the inner side surface of the second rotating circle 15, and the end faces of the two extrusion blocks 1324 are both provided with protruding teeth, and the outer side surface of the first rotating circle 14 and the inner side surface of the second rotating circle 15 are both provided with tooth grooves matching the protruding teeth.

[0050] Taking the fastening mechanism 132 matched with the second rotating circle 15 as an example, when the second rotating circle 15 needs to be fixed, the nut 1322 can be rotated, and the rotating nut 1322 moves toward the inside of the mechanism housing 1321. During the movement of the nut 1322, the nut 1322 drives the pushing block 1323, such as Figure 8As shown, the pushing block 1323 and the squeezing block 1324 are in contact with each other through the inclined surface, so when the pushing block 1323 acts on the squeezing block 1324, the squeezing block 1324 will move toward the outside of the mechanism housing 1321, that is, toward the inner side of the second rotating circle 15. When the end face of the squeezing block 1324 contacts the inner side of the second rotating circle 15, the second rotating circle 15 will be fixed by the cooperation of the raised teeth and the tooth grooves to ensure that the second rotating circle 15 will not rotate. When it is necessary to rotate the second rotating circle 15, the nut 1322 can be rotated in the opposite direction, and the rotating nut 1322 will move toward the outside of the mechanism housing 1321. During the movement of the nut 1322, the nut 1322 will drive the pushing block 1323. Figure 8 As shown, a spring is installed at one end of the inner side of the extrusion block 1324 close to the mechanism housing 1321. The elastic force of the spring acts on the extrusion block 1324, causing the extrusion block 1324 to automatically retract, thereby releasing the fixation of the second rotating circle 15.

[0051] The fixing and contact fixing methods of the first rotating circle 14 are exactly the same as those of the second rotating circle 15 , and will not be described in detail herein.

[0052] The above is a detailed description of an embodiment of the present invention, but the content is only a preferred embodiment of the present invention and cannot be considered to limit the scope of implementation of the present invention. All equivalent changes and improvements made within the scope of the present invention should still fall within the scope of the patent coverage of the present invention.

Claims

1. A large pipe internal support mechanism, characterized in that: include: Mechanism ring (1); Support legs (2), the number of which is at least three groups, and the support legs (2) are arranged at equal distances on the side of the mechanism ring (1); The mechanism ring (1) adjusts the angle of the support foot (2) along the axis direction of the large pipe by hydraulic pressure, so that the support foot (2) forms a triangular structure along the axis direction of the large pipe; A pressure threshold is preset for the support foot (2), and when the pressure value of the large pipe on the support foot (2) is greater than the pressure threshold, the support foot (2) automatically releases the hydraulic pressure applied by the mechanism ring (1) to the support foot (2); The mechanism ring (1) comprises a ring body (11), at least three sets of rotating seats (12) are fixedly connected to the side of the ring body (11), a rotating groove (13) is provided on the inner side of the ring body (11), and a first rotating circle (14) and a second rotating circle (15) are arranged in the rotating groove (13); The support foot (2) comprises two rotating arms (21), one end of each of the two rotating arms (21) is fixedly connected to a rotating shaft, the rotating shaft is used to cooperate with the rotating seat (12), and the other end of each of the two rotating arms (21) is plugged with a telescopic arm (22); One end of the telescopic arm (22) away from the rotating arm (21) is provided with a roller (23) via a rotating shaft; The middle parts of the sides of the two rotating arms (21) are fixedly connected to connecting seats (24), and a hydraulic cylinder (25) is movably connected between the two sets of connecting seats (24); The inner side surfaces of the first rotating circle (14) and the second rotating circle (15) are provided with thread grooves, the thread groove on the inner side surface of the first rotating circle (14) is meshed with a first drive shaft (141), and the thread groove on the inner side surface of the second rotating circle (15) is meshed with a second drive shaft (151); A sliding arc-shaped gear rod (17) is arranged inside the annular body (11), one end of the arc-shaped gear rod (17) is fixedly connected to a piston (18), an oil chamber (19) is provided inside the annular body (11) near the piston (18), and the oil chamber (19) is divided into two groups, one group of oil chambers (19) is connected to the inner cavity of the rotating arm (21) through an oil pipe, and the other group of oil chambers (19) is connected to the inner cavity of the hydraulic cylinder (25) through an oil pipe; A driving gear (16) is installed inside the annular body (11) at a position close to the arc-shaped gear rod (17) via a rotating shaft. The driving gear (16) is meshed with the arc-shaped gear rod (17). The driving gear (16) is divided into two groups, wherein the rotating shaft of one group of driving gears (16) is connected to the first driving shaft (141) via a universal joint, and the rotating shaft of the other group of driving gears (16) is connected to the second driving shaft (151) via a universal joint.

2. A large pipe internal support mechanism according to claim 1, characterized in that: A guide wheel (131) and two sets of fastening mechanisms (132) are installed inside the rotating groove (13) at a position close to the first rotating circle (14) and the second rotating circle (15). The two sets of fastening mechanisms (132) are used to limit the rotation of the first rotating circle (14) and the second rotating circle (15), respectively.

3. A large pipe internal support mechanism according to claim 2, characterized in that: The fastening mechanism (132) comprises a mechanism housing (1321), one end of the mechanism housing (1321) being threadedly connected to a nut (1322), one inner end of the nut (1322) being rotatably connected to a push block (1323), and a sliding extrusion block (1324) being provided on a side of the push block (1323) away from the nut (1322).

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