A bending device and bending processing method for a ship's drainage elbow

Abstract

The present application relates to a bending device and a bending processing method for a ship drainage elbow, wherein the main scheme is a bending device for a ship drainage elbow, which includes a frame, the frame is provided with a clamping and conveying mechanism, a bending mechanism and an internal support mechanism; the internal support mechanism includes an air injection assembly, a locking and adjusting assembly, a first sealing assembly and a second sealing assembly; the second sealing assembly is used to install an end portion of a steel pipe away from the clamping and conveying mechanism, and the second sealing assembly is used to seal the end portion of the steel pipe, the air injection assembly includes an air inlet pipe for extending into the steel pipe, the first sealing assembly is used to seal the gap between the air inlet pipe and the steel pipe, the locking and adjusting assembly is detachably installed on an end portion of the steel pipe close to the clamping and conveying mechanism, and the locking and adjusting assembly is used to intermittently fix and release the steel pipe at different lengths. The present application can reduce the phenomenon of internal flattening of the steel pipe after bending.

Description

Technical Field

[0001] The present application relates to the field of bending equipment, and in particular to a bending equipment and a bending processing method for a ship drainage elbow. Background Art

[0002] Ship drainage elbows often have larger diameters and thinner walls, and bending equipment is often used in their manufacture.

[0003] Existing bending equipment includes a frame, a clamping and conveying mechanism, and a bending mechanism. The clamping and conveying mechanism is used to fix the steel pipe and drive the steel pipe forward at the same time. The bending mechanism applies bending force to the steel pipe to bend the steel pipe. After the entire steel pipe is bent in multiple sections, the bending nodes of the steel pipe are cut in sequence to make multiple elbows.

[0004] During the bending process, the outer side of the bending part of the steel pipe is more likely to become severely flattened. If the method of increasing internal support is adopted, that is, filling sand into the steel pipe and adding plugs at both ends of the steel pipe, the inner wall of the steel pipe can be supported by compacted sand, which can reduce the internal flattening of the steel pipe.

[0005] However, the preparation of the elbow requires multiple bending sections, so the steel pipe after bending is twisted in multiple sections, the path of the steel pipe inner cavity is complicated, and it is difficult to pour out the internal support (such as sand, etc.), which affects the bending production of the steel pipe. Summary of the Invention

[0006] In order to reduce the inward flattening phenomenon when bending a steel pipe, the present application provides a bending device and a bending processing method for a ship drainage elbow.

[0007] This application provides a bending device for a ship drainage elbow, which adopts the following technical solution:

[0008] A bending device for a ship drainage elbow head includes a frame, which is provided with a clamping and conveying mechanism, a bending mechanism and an internal support mechanism; the internal support mechanism includes an air injection assembly, a locking and adjusting assembly, a first sealing assembly and a second sealing assembly; the second sealing assembly is used to install an end of a steel pipe away from the clamping and conveying mechanism, and the second sealing assembly is used to seal the end of the steel pipe, the air injection assembly includes an air inlet pipe for extending into the steel pipe, the first sealing assembly is used to seal the gap between the air inlet pipe and the steel pipe, the locking and adjusting assembly is detachably installed on an end of the steel pipe close to the clamping and conveying mechanism, and the locking and adjusting assembly is used to intermittently fix and release the steel pipe at different lengths.

[0009] By adopting the above technical solution, on the one hand, the first sealing component and the second sealing component form a sealed inner cavity in the steel pipe, and by injecting high-pressure gas to form an internal support of high-pressure gas, the bending and flattening phenomenon of the steel pipe is effectively reduced. After the entire steel pipe is bent, the high-pressure gas can be released, which is convenient and quick.

[0010] Secondly, by setting up a locking adjustment component, the steel pipe and the air intake pipe can be fixed. Therefore, when the first sealing component is subjected to the axial reaction force of the high-pressure gas, the axial reaction force will be transmitted to the axial direction of the steel pipe through the air intake pipe, thereby reducing the damage of the gas injection component caused by excessive axial reaction force, and the locking adjustment component can release the fixation and fix the different moving positions of the steel pipe in turn to adapt to the forward movement of the steel pipe and the bending of different nodes.

[0011] Third, the first sealing component penetrates deep into the steel pipe, so that the length of the sealing inner cavity is shorter, and the sealing inner cavity only covers the part of the steel pipe to be bent. The shorter sealing inner cavity can ensure that the volume of the high-pressure gas is smaller, thereby ensuring that the pressure of the high-pressure gas remains stable.

[0012] Optionally, the outer circumferential surface of the intake pipe is provided with a plurality of first limiting ring grooves arranged at equal intervals along the length direction of the intake pipe, and the locking adjustment assembly includes a first convex ring, a driving cylinder, an inner gear ring and a plurality of swing blocks, the first convex ring is used to be fixed to one end of the steel pipe, one end of the swing block is rotatably connected to the first convex ring, and the other end of the swing block can swing into the first limiting ring groove or swing out of the first limiting ring groove, and one end of the swing block is provided with a plurality of convex teeth, the inner gear ring is coaxially rotatably connected to the first convex ring, and the convex teeth are meshed with the inner gear ring; the cylinder body of the driving cylinder is hingedly connected to the first convex ring, and the piston rod of the driving cylinder is hingedly connected to the inner gear ring.

[0013] By adopting the above technical solution, when fixation is required, the driving cylinder is extended to drive the inner ring gear to rotate a certain angle, and the swing block is driven to swing through engagement, so that the swing block extends into the first limiting ring groove. The swing block serves as an intermediary for force transmission between the steel pipe and the intake pipe, which can reduce the axial reaction force of the intake pipe and transmit it to the steel pipe. The steel pipe has a strong axial tensile strength, thereby effectively coping with the axial reaction force.

[0014] When the fixation needs to be released, the driving cylinder is retracted to move the swing block away from the first limiting ring groove, thereby releasing the fixation between the air intake pipe and the steel pipe.

[0015] Optionally, one end of the swing block away from the first convex ring is bent and tilted in a direction toward the first sealing assembly; and the clamping position of the clamping and conveying mechanism for clamping the steel pipe is located outside the first convex ring.

[0016] By adopting the above technical solution and setting the bending part of the swing block, the axial reaction force exerted on the intake pipe is converted into a radial force radially outward along the steel pipe, while the clamping force applied to the steel pipe by the clamping and conveying mechanism is a radial force radially inward along the steel bar. The two radial forces offset each other, which can effectively reduce the radial deformation of the steel pipe.

[0017] Optionally, the locking adjustment component includes a second convex ring, an oblique rod, a sliding sleeve, a swing rod, a bracket and a connecting rod; the sliding sleeve is arranged on the intake pipe, and the outer peripheral surface of the sliding sleeve is provided with a plurality of second limiting ring grooves arranged at equal intervals along the length direction of the intake pipe, and the outer peripheral surface of the sliding sleeve is fixed with a fourth convex ring, the bracket is fixedly connected to the outer peripheral wall of the intake pipe, and the portion of the swing rod away from the intake pipe is hingedly connected to the bracket; the back of the first sealing component is fixed with a plurality of force transmission strips arranged along the radial direction of the intake pipe, and one end of the connecting rod is fixed with the The force transmission bar is hingedly connected, the other end of the connecting rod is hingedly connected to the end of the swing rod away from the intake pipe, and the other end of the swing rod is in contact with the end face of the fourth convex ring away from the first sealing assembly; the second convex ring is used to be fixed to one end of the steel pipe, one end of the oblique rod is hingedly connected to the second convex ring, and the other end of the oblique rod is tilted in the direction away from the first sealing assembly. A spring is provided on the second convex ring, and the spring is used to force the end of the oblique rod to be tilted in the direction close to the first sealing assembly and inserted into the second limiting ring groove.

[0018] By adopting the above technical solution, when the clamping and conveying mechanism drives the steel pipe forward, the forward force of the steel pipe will force the inclined rod to disengage from the second limiting ring groove, thereby realizing automatic release of the fixation, which is convenient and quick.

[0019] Secondly, the axial reaction force of the intake pipe is transmitted to the sliding sleeve through the force transmission bar, the connecting rod and the swing rod in sequence, that is, the sliding sleeve has a tendency to move along the forward direction of the steel pipe, and this movement tendency acts on the steel pipe through the inclined rod, thereby achieving the effect of transmitting the axial reaction force of the intake pipe to the steel pipe.

[0020] In summary, the automatic release of the locking adjustment component and the stable transmission of the axial reaction force are achieved.

[0021] Optionally, the first sealing assembly includes a disc and a first sealing ring, the disc is coaxially fixed to the end of the intake pipe, the disc is provided with an air hole connected to the intake pipe, and the surface of the disc is recessed and provided with a conical surface; the first sealing ring is fixed to the outer circumferential surface of the disc, the first sealing ring has a first fitting portion, a connecting portion and a second fitting portion, wherein the connecting portion is used to be fixedly connected to the disc, the first fitting portion is located on the front side of the disc, the inner wall of the first fitting portion is inclined away from the disc and the outer wall of the first fitting portion abuts the inner wall of the steel pipe; the second fitting portion is located at the outer diameter of the disc, the second fitting portion is provided with a guide surface, and the guide surface abuts the outer edge of the front side of the disc.

[0022] By adopting the above technical solution, firstly, under the action of the high-pressure gas in the sealed inner cavity, the first fitting portion will be deformed and tightly fitted to the inner wall of the steel pipe, thereby improving the sealing effect.

[0023] Secondly, by setting the conical surface, the outer diameter of the disc is more susceptible to the force of high-pressure gas and has a deformation tendency. This deformation tendency will be transmitted to the second fitting part through the guide surface, so that the second fitting part is deformed and tightly fitted to the inner wall of the steel pipe, thereby improving the sealing effect.

[0024] Optionally, the first sealing assembly also includes an elastic skeleton, which includes a plurality of first spring sheets and a plurality of second spring sheets, and the first spring sheets and the second spring sheets are evenly staggered and arranged along the circumference of the disc, and the ends of the first spring sheets and the ends of the second spring sheets are fixedly connected by a third spring sheet arranged radially; a ring body is coaxially fixed on the front side of the disc, and a first slot is provided on the outer peripheral surface of the ring body, and the second spring sheet is movably inserted into the first slot, and a second slot is provided on the inner peripheral surface of the first fitting part, and the first spring sheet is movably inserted into the second slot, and the elastic force of the elastic skeleton forces the first fitting part to expand and deform radially outward.

[0025] By adopting the above technical solution, when the elastic skeleton recovers its elastic deformation, the spring skeleton will force the first fitting portion to expand and deform radially outward, and the first fitting portion will deform and fit tightly against the inner wall of the steel pipe, thereby improving the sealing effect.

[0026] Optionally, the second sealing assembly includes a third convex ring and a rubber disc, the third convex ring is used to be fixed to one end of the steel pipe, the rubber disc is located inside the one end of the steel pipe, and the outer peripheral surface of the rubber disc is integrally formed with a third fitting portion, the inner wall of the third fitting portion is inclined in a direction away from the third convex ring and the outer wall of the third fitting portion abuts against the inner wall of the steel pipe.

[0027] By adopting the above technical solution, the third convex ring can axially limit the rubber disc to reduce the occurrence of the rubber disc being washed away by high-pressure gas. Under the action of the high-pressure gas in the sealed inner cavity, the third fitting part will deform and fit tightly to the inner wall of the steel pipe, thereby improving the sealing effect.

[0028] Optionally, an annular guide groove is provided on the surface of the rubber disc facing the third convex ring, and an annular guide convex ring is protruding from the end face of the third convex ring, and the guide convex ring abuts against the inclined groove wall of the guide groove; the second sealing assembly also includes a rotating ring and an insert block, the outer diameter of the rotating ring is threadedly connected to the inner diameter of the third convex ring, and the rotating ring and the rubber disc are detachably fixedly connected via the insert block.

[0029] By adopting the above technical solution, after installation, the rotating ring is rotated to make the rotating ring move axially away from the steel pipe, and the plug block is used to drive the rubber disc to move axially away from the steel pipe. Through the cooperation of the guide convex ring and the guide bevel groove, the outer diameter of the rubber disc is forced to deform radially outward, so that it abuts more closely against the inner wall of the steel pipe, thereby improving the sealing effect.

[0030] The present application also provides a bending processing method for a bending device of a ship drainage elbow head, which adopts the following technical solution:

[0031] A bending processing method of a bending device for a ship drainage elbow comprises the following steps:

[0032] S1. Positioning the steel pipe and the internal support mechanism: Insert the steel pipe from the end of the intake pipe, ensuring that the first sealing assembly is located inside the steel pipe, install the second sealing assembly on the other end of the steel pipe, clamp the steel pipe with the clamping and conveying mechanism, and secure the steel pipe and the intake pipe with the locking and adjusting assembly;

[0033] S2, the gas injection assembly injects gas into the sealed inner cavity of the steel pipe located between the first sealing assembly and the second sealing assembly;

[0034] S3. Steel pipe bending: The clamping and conveying mechanism conveys the steel pipe to the bending mechanism, which is then activated to bend the steel pipe. After the first section of the steel pipe is bent, the locking and adjusting assembly releases the fixation between the steel pipe and the air inlet pipe. The clamping and conveying mechanism then pushes the steel pipe forward for a certain distance. The gas injection assembly replenishes gas into the sealed inner cavity of the steel pipe between the first sealing assembly and the second sealing assembly. The second section of the steel pipe is then bent using the bending mechanism.

[0035] S4. Repeat step S3 to bend multiple sections of the steel pipe in sequence.

[0036] Optionally, in step S3, while the bending mechanism is bending the steel pipe, the gas injection assembly continues to replenish gas to the sealed inner cavity of the steel pipe, and after the bending is completed, the gas injection assembly stops injecting gas.

[0037] By adopting the above technical solution, the continuous injection of high-pressure gas during the bending process can strengthen the internal support force at the bending moment, thereby promptly responding to the stress mutation at the bending moment and effectively reducing the occurrence of flattening.

[0038] In summary, this application includes at least one of the following beneficial technical effects:

[0039] 1. A sealed inner cavity is formed in the steel pipe by the first sealing component and the second sealing component. High-pressure gas is injected to form an internal support of high-pressure gas, which effectively reduces the bending and flattening phenomenon of the steel pipe. After the entire steel pipe is bent, the high-pressure gas can be released, which is convenient and quick.

[0040] 2. By setting the curved part of the swing block, the axial reaction force on the intake pipe is converted into a radial force directed outward along the radial direction of the steel pipe, while the clamping force applied to the steel pipe by the clamping and conveying mechanism is a radial force directed inward along the radial direction of the steel bar. The two radial forces offset each other, which can effectively reduce the radial deformation of the steel pipe;

[0041] 3. The continuous injection of high-pressure gas during the bending process can strengthen the internal support force at the bending moment, thereby responding to the sudden stress change at the bending moment in time to effectively reduce the occurrence of flattening. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 It is a schematic diagram of the overall structure of Example 1.

[0043] Figure 2 4 is a cross-sectional view of the second sealing assembly of Example 1.

[0044] Figure 3 yes Figure 1 A partial enlarged view of point A in the middle.

[0045] Figure 4 2 is a cross-sectional view of the locking adjustment assembly of Example 1.

[0046] Figure 5 4 is a front view of the locking adjustment assembly of Example 1.

[0047] Figure 6 2 is a cross-sectional view of the locking adjustment assembly of Example 2.

[0048] Figure 7 yes Figure 6 A partial enlarged view of point B in the middle.

[0049] Figure 8 yes Figure 6 A partial enlarged view of point C in the middle.

[0050] Figure 9 It is a partial cross-sectional view of the first sealing assembly of Example 3.

[0051] Figure 10 Schematic diagram of the elastic skeleton of Example 3.

[0052] Explanation of reference numerals: 1. first sealing assembly; 2. second sealing assembly; 3. gas injection assembly; 5. locking adjustment assembly; 10. clamping and conveying mechanism; 100. steel pipe; 11. disc; 111. conical surface; 12. first sealing ring; 121. first fitting portion; 122. second fitting portion; 123. connecting portion; 124. guide surface; 125. second clamping groove; 13. elastic skeleton; 131. first spring piece; 132. second spring piece; 133. third spring piece; 14. ring body; 141. first clamping groove; 20. bending mechanism; 21. rubber disc; 211. third fitting portion Part; 212, guide inclined groove; 22, third convex ring; 23, rotating ring; 24, insert block; 25, guide convex ring; 26, T-slot; 30, auxiliary bar block; 31, air intake pipe; 311, first limiting ring groove; 32, air supply structure; 40, track; 51, first convex ring; 52, swing block; 521, convex teeth; 53, inner ring gear; 54, driving cylinder; 55, sliding sleeve; 551, second limiting ring groove; 561, force transmission strip; 562, connecting rod; 563, swing rod; 564, bracket; 565, fourth convex ring; 57, inclined rod; 58, second convex ring; 59, spring. DETAILED DESCRIPTION

[0053] The following is combined with Figure 1-10 This application is described in further detail.

[0054] Example 1 of the present application discloses a bending device for a ship drainage elbow.

[0055] Reference Figure 1 The bending equipment of the ship drainage elbow includes a frame, which is provided with a clamping and conveying mechanism 10, a bending mechanism 20 and an internal support mechanism. The clamping and conveying mechanism 10 clamps the end position of the outer circumference of the steel pipe 100 by means of a clamping claw. The frame is provided with a track 40 for the clamping and conveying mechanism 10 to move axially along the steel pipe 100, so that the clamping and conveying mechanism 10 can drive the steel pipe 100 to advance intermittently to deliver different axial positions of the steel pipe 100 to the bending mechanism 20. The bending mechanism 20 bends different length nodes of the steel pipe 100 in turn, thereby forming a multi-section bent steel pipe 100.

[0056] In addition, an auxiliary bar 30 can be provided on the frame, and the auxiliary bar 30 abuts against the outer peripheral surface of the steel pipe 100 to play a guiding role to improve the bending effect. In other embodiments, a cylinder can be provided on the frame, and the auxiliary bar 30 can move axially along the steel pipe 100 under the drive of the cylinder. A friction plate is provided on the auxiliary bar 30, and the axial friction force applied to the steel pipe 100 by the auxiliary bar 30 is used to assist in pushing the steel pipe 100 to move axially, so as to provide a margin for axial movement of the steel pipe 100 during the bending process of the steel pipe 100.

[0057] like Figure 1 、 Figure 2 As shown, the internal support mechanism is used to provide internal support force to the inner wall of the steel pipe 100, so as to effectively reduce the bending and inward flattening phenomenon of the steel pipe 100. The internal support mechanism includes a gas injection component 3, a first sealing component 1 and a second sealing component 2; wherein the second sealing component 2 is installed at the end of the steel pipe 100 away from the clamping and conveying mechanism 10, and the second sealing component 2 is used to seal the end of the steel pipe 100. The first sealing component 1 penetrates into the inner wall of the steel pipe 100 and seals the middle local position of the steel pipe 100, that is, the first sealing component 1 and the second sealing component 2 form a sealed inner cavity in the steel pipe 100, and the sealed inner cavity covers the part of the steel pipe 100 to be bent, and the gas injection component 3 is used to inject high-pressure gas into the sealed inner cavity, and use the pressure of the high-pressure gas to support the part of the steel pipe 100 to be bent, thereby reducing the bending and inward flattening phenomenon of the steel pipe 100.

[0058] Furthermore, after the entire steel pipe 100 is bent, the seals of the first sealing component 1 and the second sealing component 2 can be released to release the high-pressure gas, which is convenient and quick.

[0059] like Figure 2 As shown, the second sealing assembly 2 includes a third convex ring 22, a rubber disc 21, a rotating ring 23 and an insert 24. The rubber disc 21 is located inside one end of the steel pipe 100. The outer peripheral surface of the rubber disc 21 is integrally formed with an annular third fitting portion 211. The inner wall of the third fitting portion 211 is inclined in a direction away from the pipe mouth of the steel pipe 100 and the outer wall of the third fitting portion 211 abuts against the inner wall of the steel pipe 100. The surface of the rubber disc 21 facing the pipe mouth of the steel pipe 100 is provided with an annular guide bevel 212. The guide bevel 212 has an inclined groove wall, and the inner diameter of the inclined groove wall gradually decreases in a direction away from the pipe mouth of the steel pipe 100.

[0060] The third protruding ring 22 is used to secure one end of the steel pipe 100, located between the rubber disc 21 and the end of the steel pipe 100. This securing method can be welding or bolting. If welding is used, the section must be cut off after bending. If bolting is used, holes must be drilled in the end of the steel pipe 100 to facilitate radial insertion of the bolts.

[0061] An annular guide protrusion 25 is protruding from the end surface of the third protrusion ring 22 . The guide protrusion 25 abuts against the inclined groove wall of the guide inclined groove 212 .

[0062] The outer diameter of the rotating ring 23 is threadedly connected to the inner diameter of the third convex ring 22, and the rotating ring 23 and the rubber disc 21 are detachably fixedly connected via an insert block 24. Specifically, T-slots 26 are provided on the opposite end faces of the rotating ring 23 and the rubber disc 21. The length direction of the T-slot 26 is arranged along the radial direction of the rotating ring 23, and the cross-section of the insert block 24 is I-shaped, that is, the insert block 24 cooperates with two T-slots 26 at the same time to axially connect the rotating ring 23 and the rubber disc 21.

[0063] During installation, the rubber disc 21 is placed inside the end of the steel pipe 100 through the pipe mouth of the steel pipe 100, and then the third convex ring 22 is fixed to the inner wall of the steel pipe 100. The third convex ring 22 can axially limit the rubber disc 21 to reduce the occurrence of the rubber disc 21 being washed away by the high-pressure gas. Then, the rotating ring 23 is screwed in so that the two T-slots 26 are connected. Then the plug block 24 is installed, and then the rotating ring 23 is retracted so that the rotating ring 23 moves axially away from the steel pipe 100. The plug block 24 is used to drive the rubber disc 21 to move axially away from the steel pipe 100. Through the cooperation of the guide convex ring 25 and the guide inclined groove 212, the outer diameter of the rubber disc 21 is forced to deform radially outward, thereby more closely abutting against the inner wall of the steel pipe 100 to improve the sealing effect.

[0064] The gas injection assembly 3 includes an air inlet pipe 31 for extending into the steel pipe 100 and an air supply structure 32 for supplying air into the air inlet pipe 31. The air supply structure 32 can be composed of an air compressor, an air storage tank, etc. The air supply structure 32 is installed on the frame by bolts. The air supply structure 32 injects high-pressure gas into the sealed inner cavity in a quantitative and controllable manner.

[0065] like Figure 1 、 Figure 3 As shown, the first sealing assembly 1 is installed at the end of the intake pipe 31. Specifically, a sealing assembly includes a disc 11 and a first sealing ring 12. The disc 11 is coaxially fixed to the end of the intake pipe 31. The disc 11 is provided with an air hole connected to the intake pipe 31. The surface of the disc 11 is recessed with a conical surface 111. The conical surface 111 is coaxially arranged with the disc 11, so that the inner diameter part of the disc 11 is thinner and the outer diameter part is thicker. Therefore, the disc 11 has a greater tendency to deform and displace under the axial reaction force exerted by the high-pressure gas.

[0066] The first sealing ring 12 is located on the outer circumferential surface of the disc 11. The first sealing ring 12 has an annular first fitting portion 121, an annular connecting portion 123 and an annular second fitting portion 122, wherein the connecting portion 123 is fixed to the disc 11 by means of a clip-on connection. The first fitting portion 121 is located on the front side of the disc 11 (the front side of the disc 11 is the surface facing the forward direction of the steel pipe 100). The inner wall of the first fitting portion 121 is inclined in a direction away from the disc 11 and the outer wall of the first fitting portion 121 abuts against the inner wall of the steel pipe 100.

[0067] The second fitting portion 122 is located at the outer diameter of the disc 11 (between the outer circumferential surface of the disc 11 and the inner wall of the steel pipe 100). The second fitting portion 122 is provided with a guide surface 124, which abuts against the outer edge of the front surface of the disc 11. Therefore, under the action of the high-pressure gas in the sealed inner cavity, the second fitting portion 122 tends to move away from the forward direction of the steel pipe 100. By abutting the outer edge of the front surface of the disc 11 with the guide surface 124, the force will be converted into a component force that forces the second fitting portion 122 to deform and fit tightly against the inner wall of the steel pipe 100, thereby improving the sealing effect.

[0068] When the disc 11 is subjected to the axial reaction force of the high-pressure gas in the sealed inner cavity, if the axial reaction force is too large and is directly transmitted to the air supply structure 32 through the air inlet pipe 31, the air supply structure 32 is easily damaged. In order to solve the above problem, the following settings are also made.

[0069] like Figure 4 、 Figure 5 As shown, the internal support mechanism also includes a locking and adjusting assembly 5, which is used to intermittently fix and release the steel pipe 100 at different lengths. That is, when the locking and adjusting assembly 5 fixes the steel pipe 100 to the air inlet pipe 31, the axial reaction force will be transmitted to the axial direction of the steel pipe 100 through the air inlet pipe 31. The steel pipe 100 has a strong axial tensile strength and can effectively resist this axial reaction force. Before the clamping and conveying mechanism 10 drives the steel pipe 100 forward, the locking and adjusting assembly 5 can release the fixation to allow the steel pipe 100 to move.

[0070] Specifically, the locking adjustment assembly 5 includes a first convex ring 51, a driving cylinder 54, an inner gear ring 53 and a plurality of swing blocks 52. The outer peripheral surface of the intake pipe 31 is provided with a plurality of first limiting ring grooves 311. The first limiting ring grooves 311 are arranged at equal intervals along the length direction of the intake pipe 31. The first convex ring 51 is fixed to the inner wall of one end of the steel pipe 100 by welding or bolting. The clamping position of the clamping and conveying mechanism 10 for clamping the steel pipe 100 is located on the outside of the first convex ring 51.

[0071] Each swing block 52 is evenly arranged along the circumference of the first convex ring 51, one end of the swing block 52 is rotatably connected to the first convex ring 51, and the end of the swing block 52 away from the first convex ring 51 is bent and tilted in the direction toward the disk 11. This end of the swing block 52 can swing into the first limiting ring groove 311 or swing out of the first limiting ring groove 311.

[0072] One end of the swing block 52 is provided with a plurality of convex teeth 521, and the inner ring gear 53 is coaxially rotatably connected with the first convex ring 51. The rotational connection can be a circular rail (not shown in the figure) provided on the first convex ring 51 for the inner ring gear 53 to cooperate with, and the convex teeth 521 are engaged with the inner ring gear 53; the cylinder body of the driving cylinder 54 is hingedly connected to the first convex ring 51, and the piston rod of the driving cylinder 54 is hingedly connected to the inner ring gear 53, and the telescopic axis of the driving cylinder 54 intersects with the outer periphery of the inner ring gear 53.

[0073] When fixation is required, the driving cylinder 54 is extended, driving the inner ring gear 53 to rotate a certain angle, and the swing block 52 is driven to swing through engagement, so that the swing block 52 extends into the first limiting ring groove 311. The swing block 52 serves as an intermediary for force transmission between the steel pipe 100 and the air intake pipe 31, so that the axial reaction force exerted on the air intake pipe 31 is converted into a radial force radially outward along the steel pipe 100 and an axial force along the axial direction of the steel pipe 100. The clamping force applied by the clamping and conveying mechanism 10 to the steel pipe 100 is a radial force radially inward along the steel bar. The two radial forces offset each other, which can effectively reduce the radial deformation of the steel pipe 100, and the axial force is borne by the steel pipe 100.

[0074] The swing block 52 cooperates with the first limiting ring grooves 311 at different positions, so that the steel pipe 100 can be moved to different positions and fixed respectively.

[0075] When the fixation needs to be released, the driving cylinder 54 retracts to move the swing block 52 away from the first limiting ring groove 311, thereby releasing the fixation between the air inlet pipe 31 and the steel pipe 100.

[0076] Example 1 also discloses a bending method for a ship drainage elbow bending device, comprising the following steps:

[0077] S1. Put the steel pipe 100 and the internal support mechanism in place: insert the steel pipe 100 from the end of the intake pipe 31, ensure that the first sealing assembly 1 is located inside the steel pipe 100, and the first sealing ring 12 is in contact with the inner wall of the steel pipe 100, and then install the second sealing assembly 2 on the other end of the steel pipe 100.

[0078] The clamping and conveying mechanism 10 clamps the steel pipe 100 , ensuring that the clamping position is the position on the steel pipe 100 corresponding to the first convex ring 51 , and then the locking and adjusting assembly 5 is used to fix the steel pipe 100 and the air inlet pipe 31 .

[0079] S2, the gas injection component 3 injects gas into the sealed inner cavity of the steel pipe 100 located between the first sealing component 1 and the second sealing component 2 until the high-pressure gas reaches an appropriate pressure and maintains the pressure for 10-30 seconds to detect leakage. If pressure loss occurs, the first sealing component 1 and the second sealing component 2 need to be reinstalled.

[0080] S3. Bending processing of the steel pipe 100: The clamping and conveying mechanism 10 conveys the steel pipe 100 to the bending mechanism 20. Before conveying, the locking and adjusting component 5 releases the fixation of the steel pipe 100 and the air intake pipe 31 until the part of the steel pipe 100 to be bent is located at the bending mechanism 20. Then, the locking and adjusting component 5 is used again to fix the steel pipe 100 and the air intake pipe 31, and the bending mechanism 20 is started to bend the steel pipe 100.

[0081] After the first section of the steel pipe 100 is bent, the locking and adjusting assembly 5 releases the fixation between the steel pipe 100 and the air inlet pipe 31, and the clamping and conveying mechanism 10 pushes the steel pipe 100 forward a certain distance. At this time, the volume of the sealed inner cavity increases, so the gas injection assembly 3 replenishes gas into the sealed inner cavity of the steel pipe 100 located between the first sealing assembly 1 and the second sealing assembly 2, and then uses the bending mechanism 20 to bend the second section of the steel pipe 100.

[0082] In the above steps, in this embodiment, after the gas injection assembly 3 has finished replenishing the gas, the gas injection is stopped, and then the bending action is performed.

[0083] In other embodiments, during the process of bending the steel pipe 100 by the bending mechanism 20, the gas injection component 3 continuously replenishes gas for the sealed inner cavity of the steel pipe 100. After the bending is completed, the gas injection of the gas injection component 3 is stopped. In this way, the continuous injection of high-pressure gas can strengthen the internal supporting force at the moment of bending, thereby responding to the sudden stress change at the moment of bending in time to effectively reduce the occurrence of flattening.

[0084] S4. Repeat step S3 to bend multiple sections of the steel pipe 100 in sequence.

[0085] S5. After bending, remove the second sealing assembly 2. The portion of the steel pipe 100 corresponding to the second sealing assembly 2 can be cut off by cutting, or the insert 24, the rotating ring 23, the third convex ring 22, and the rubber disc 21 can be removed in sequence. The specific removal method can be determined according to the installation method of the third convex ring 22 to release the high-pressure gas, and then remove the bent steel pipe 100 from the rack.

[0086] Example 2

[0087] The difference between Example 2 and Example 1 is that Figure 6 、 Figure 7、 Figure 8 As shown, the locking and adjusting assembly 5 includes a second protruding ring 58, an inclined rod 57, a sliding sleeve 55, a swinging rod 563, a bracket 564, and a connecting rod 562. The sliding sleeve 55 is slidably mounted on the intake pipe 31. The outer circumference of the sliding sleeve 55 is defined by a plurality of second retaining ring grooves 551, which are arranged at equal intervals along the length of the intake pipe 31. A fourth protruding ring 565 is fixed to the end of the outer circumference of the sliding sleeve 55 that is closest to the disk 11.

[0088] Bracket 564 is fixedly connected to the outer peripheral wall of intake pipe 31, and is fixed between the end of sleeve 55 and disk 11. Swinging rod 563 is located within the radial plane of intake pipe 31. The portion of swinging rod 563 away from intake pipe 31 is hingedly connected to bracket 564. The hinged portion of swinging rod 563 with bracket 564 may be located at one-third of its length.

[0089] A plurality of force transmission bars 561 radially arranged along the air intake pipe 31 are fixed to the back of the disc 11. The force transmission bars 561 are evenly arranged along the circumference of the disc 11. The connecting rod 562 is arranged in a one-to-one correspondence with the force transmission bars 561. One end of the connecting rod 562 is hingedly connected to the end of the force transmission bar 561 away from the air intake pipe 31, and the other end of the connecting rod 562 is hingedly connected to the end of the swing rod 563 away from the air intake pipe 31. The other end of the swing rod 563 abuts against the end face of the fourth convex ring 565 away from the disc 11.

[0090] like Figure 8 As shown, the second convex ring 58 is fixed to the inner wall of one end of the steel pipe 100 by welding or bolting, one end of the inclined rod 57 is hingedly connected to the second convex ring 58, and the other end of the inclined rod 57 is tilted in the direction away from the disc 11. A spring 59 is provided on the second convex ring 58, and the spring 59 is used to force the end of the inclined rod 57 to be tilted in the direction close to the disc 11 and inserted into the second limiting ring groove 551.

[0091] When the clamping and conveying mechanism 10 drives the steel pipe 100 forward, the forward force of the steel pipe 100 will force the inclined rod 57 to swing, the spring 59 will be stretched, and the inclined rod 57 will naturally disengage from the second limiting ring groove 551, thereby realizing the automatic release of the fixation between the sliding sleeve 55 and the steel pipe 100. Compared with the method of releasing the fixation of the locking adjustment component 5 in Example 1, the method of Example 2 is more convenient and quick.

[0092] When the pressure of the high-pressure gas in the sealed inner cavity is applied to the disc 11, the disc 11 has a displacement tendency of being compressed and deformed. Therefore, the disc 11 can transmit the pressure of the high-pressure gas to the connecting rod 562 through the force transmission bar 561, and then the swing rod 563 transmits it to the sliding sleeve 55 through abutment, so that the sliding sleeve 55 has a movement tendency along the forward direction of the steel pipe 100, and this movement tendency acts on the steel pipe 100 through the inclined rod 57. The direction of this movement tendency is close to the inclination direction of the inclined rod 57, so that the inclined rod 57 will not detach from the second limiting ring groove 551, but will only transmit the force of the sliding sleeve 55 to the steel pipe 100, thereby offsetting the force.

[0093] Example 3

[0094] The difference between Example 3 and Example 1 or Example 2 is that Figure 9 、 Figure 10 As shown, the first sealing assembly 1 also includes an elastic skeleton 13, which includes a plurality of first elastic fragments 131 and a plurality of second elastic fragments 132. The first elastic fragments 131 and the second elastic fragments 132 are evenly staggered and arranged along the circumference of the disc 11. The end of the first elastic fragment 131 and the end of the second elastic fragment 132 are fixedly connected by a third elastic fragment 133 arranged radially, wherein the first elastic fragment 131 is located at the outer diameter position of the elastic skeleton 13, and the second elastic fragment 132 is located at the inner diameter position of the elastic skeleton 13.

[0095] In a normal state, that is, when the elastic frame 13 is not subjected to external force, the elastic frame 13 is vertical in its own longitudinal section.

[0096] A ring body 14 is coaxially fixed to the front of the disc 11, and a first slot 141 is provided on the outer circumference of the ring body 14, and a second slot 125 is provided on the inner circumference of the first fitting portion 121. The second elastic piece 132 is movably inserted into the first slot 141, and the first elastic piece 131 is movably inserted into the second slot 125. At this time, the elastic skeleton 13 is inclined in its own longitudinal section, and the elastic force of the elastic skeleton 13 forces itself to recover from the inclined state to the vertical state. During the deformation recovery process, the elastic force of the elastic skeleton 13 will be applied to the first fitting portion 121, so that the first fitting portion 121 is tightly fitted to the inner wall of the steel pipe 100, and in this process, the outer diameter of the elastic skeleton 13 will increase, thereby forcing the first fitting portion 121 to expand and deform radially outward, and the first fitting portion 121 is further tightly fitted to the inner wall of the steel pipe 100, further improving the sealing effect.

[0097] The above are all preferred embodiments of the present application, and are not intended to limit the scope of protection of the present application. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the scope of protection of the present application.

Claims

1. A bending device for a ship drainage elbow, characterized by: The invention comprises a frame, wherein the frame is provided with a clamping and conveying mechanism (10), a bending mechanism (20) and an inner supporting mechanism; the inner supporting mechanism comprises an air injection assembly (3), a locking and adjusting assembly (5), a first sealing assembly (1) and a second sealing assembly (2); the second sealing assembly (2) is used for installing an end of a steel pipe (100) away from the clamping and conveying mechanism (10), and the second sealing assembly (2) is used for sealing the end of the steel pipe (100); the air injection assembly (3) comprises an air inlet pipe (31) for extending into the steel pipe (100), and the first sealing assembly (1) is used for sealing the air inlet pipe (31) and the steel pipe (100). ) is sealed, the locking adjustment component (5) is detachably mounted on one end of the steel pipe (100) near the clamping and conveying mechanism (10), and the locking adjustment component (5) is used to intermittently fix and release the steel pipe (100) at different lengths; the locking adjustment component (5) comprises a second convex ring (58), an inclined rod (57), a sliding sleeve (55), a swing rod (563), a bracket (564) and a connecting rod (562); the sliding sleeve (55) is slidingly mounted on the air inlet pipe (31), and the outer peripheral surface of the sliding sleeve (55) is provided with a plurality of equidistant longitudinally spaced ... The second limiting ring groove (551) is arranged, the outer peripheral surface of the sliding sleeve (55) is fixed with a fourth convex ring (565), the bracket (564) is fixedly connected to the outer peripheral wall of the intake pipe (31), and the portion of the swing rod (563) away from the intake pipe (31) is hingedly connected to the bracket (564); the back side of the first sealing component (1) is fixed with a plurality of force transmission strips (561) arranged along the radial direction of the intake pipe (31), one end of the connecting rod (562) is hingedly connected to the force transmission strip (561), and the other end of the connecting rod (562) is hingedly connected to the portion of the swing rod (563) away from the intake pipe (31). One end is hingedly connected, and the other end of the swing rod (563) abuts against the end face of the fourth convex ring (565) away from the first sealing component (1); the second convex ring (58) is used to be fixed to one end of the steel pipe (100), one end of the inclined rod (57) is hingedly connected to the second convex ring (58), and the other end of the inclined rod (57) is tilted in a direction away from the first sealing component (1). The second convex ring (58) is provided with a spring (59), and the spring (59) is used to force the end of the inclined rod (57) to be tilted in a direction close to the first sealing component (1) and inserted into the second limiting ring groove (551).

2. The bending device for a ship drainage elbow according to claim 1, characterized in that: The outer peripheral surface of the air intake pipe (31) is provided with a plurality of first limiting ring grooves (311) arranged at equal intervals along the length direction of the air intake pipe (31). The locking adjustment assembly (5) comprises a first convex ring (51), a driving cylinder (54), an inner gear ring (53) and a plurality of swing blocks (52). The first convex ring (51) is used to be fixed to one end of the steel pipe (100). One end of the swing block (52) is rotatably connected to the first convex ring (51). The other end of the swing block (52) is rotatably connected to the first convex ring (51). The end of the swing block (52) can swing into the first limiting ring groove (311) or swing out of the first limiting ring groove (311), one end of the swing block (52) is provided with a plurality of convex teeth (521), the inner gear ring (53) is coaxially rotatably connected to the first convex ring (51), and the convex teeth (521) are meshed with the inner gear ring (53); the cylinder body of the driving cylinder (54) is hingedly connected to the first convex ring (51), and the piston rod of the driving cylinder (54) is hingedly connected to the inner gear ring (53).

3. The bending device for a ship drainage elbow according to claim 2, characterized in that: One end of the swing block (52) away from the first convex ring (51) is bent and tilted in a direction toward the first sealing assembly (1); and a clamping position of the clamping and conveying mechanism (10) for clamping the steel pipe (100) is located outside the first convex ring (51).

4. The bending device for a ship drainage elbow according to any one of claims 1 to 3, characterized in that: The first sealing assembly (1) comprises a disc (11) and a first sealing ring (12), wherein the disc (11) is coaxially fixed to the end of the intake pipe (31), the disc (11) is provided with an air hole communicating with the intake pipe (31), and the surface of the disc (11) is recessed and provided with a conical surface (111); the first sealing ring (12) is fixed to the outer peripheral surface of the disc (11), and the first sealing ring (12) has a first fitting portion (121), a connecting portion (123) and a second fitting portion (122), wherein The middle connecting portion (123) is used for being fixedly connected to the disc (11); the first fitting portion (121) is located on the front side of the disc (11); the inner wall of the first fitting portion (121) is inclined in a direction away from the disc (11); and the outer wall of the first fitting portion (121) abuts against the inner wall of the steel pipe (100); the second fitting portion (122) is located at the outer diameter of the disc (11); the second fitting portion (122) is provided with a guide surface (124); and the guide surface (124) abuts against the outer edge of the front side of the disc (11).

5. The bending device for a ship drainage elbow according to claim 4, characterized in that: The first sealing assembly (1) further comprises an elastic skeleton (13), the elastic skeleton (13) comprising a plurality of first elastic pieces (131) and a plurality of second elastic pieces (132), the first elastic pieces (131) and the second elastic pieces (132) being evenly staggered and arranged along the circumference of the disk (11), the end of the first elastic piece (131) and the end of the second elastic piece (132) being fixedly connected via a third elastic piece (133) arranged in a radial direction; a ring body (14) is coaxially fixed to the front of the disk (11), the outer peripheral surface of the ring body (14) is provided with a first clamping groove (141), the second elastic piece (132) is movably inserted into the first clamping groove (141), the inner peripheral surface of the first fitting portion (121) is provided with a second clamping groove (125), the first elastic piece (131) is movably inserted into the second clamping groove (125), and the elastic force of the elastic skeleton (13) forces the first fitting portion (121) to deform radially outward.

6. The bending device for a ship drainage elbow according to claim 1, characterized in that: The second sealing assembly (2) comprises a third convex ring (22) and a rubber disc (21), wherein the third convex ring (22) is used to be fixed to one end of the steel pipe (100), and the rubber disc (21) is located inside the one end of the steel pipe (100), and a third fitting portion (211) is integrally formed on the outer peripheral surface of the rubber disc (21), and the inner wall of the third fitting portion (211) is inclined in a direction away from the third convex ring (22), and the outer wall of the third fitting portion (211) abuts against the inner wall of the steel pipe (100).

7. The bending device for a ship drainage elbow according to claim 6, characterized in that: The surface of the rubber disc (21) facing the third convex ring (22) is provided with an annular guide bevel groove (212), and the end surface of the third convex ring (22) is protrudingly constructed with an annular guide convex ring (25), and the guide convex ring (25) abuts against the inclined groove wall of the guide bevel groove (212); the second sealing assembly (2) further includes a rotating ring (23) and an insert (24), the outer diameter of the rotating ring (23) is threadedly connected to the inner diameter of the third convex ring (22), and the rotating ring (23) and the rubber disc (21) are detachably fixedly connected via the insert (24).

8. A bending method for a ship drainage elbow according to claim 1, characterized in that: The following steps are involved: S1. Putting the steel pipe (100) in place and the inner supporting mechanism in place: inserting the steel pipe (100) from the end of the air inlet pipe (31), ensuring that the first sealing component (1) is located inside the steel pipe (100), installing the second sealing component (2) on the other end of the steel pipe (100), clamping the steel pipe (100) with the clamping and conveying mechanism (10), and fixing the steel pipe (100) and the air inlet pipe (31) with the locking and adjusting component (5); S2, the gas injection component (3) injects gas into the sealed inner cavity of the steel pipe (100) located between the first sealing component (1) and the second sealing component (2); S3, steel pipe (100) bending processing: the clamping and conveying mechanism (10) conveys the steel pipe (100) to the bending mechanism (20), and the bending mechanism (20) is started to bend the steel pipe (100); after the first section of the steel pipe (100) is bent, the locking and adjusting component (5) releases the fixation between the steel pipe (100) and the air inlet pipe (31), and the clamping and conveying mechanism (10) pushes the steel pipe (100) forward for a distance, and the gas injection component (3) replenishes gas into the sealed inner cavity of the steel pipe (100) located between the first sealing component (1) and the second sealing component (2), and then the bending mechanism (20) is used to bend the second section of the steel pipe (100); S4. Repeat step S3 to bend multiple sections of the steel pipe (100) in sequence.

9. The bending method of the bending equipment for the ship drainage elbow according to claim 8, characterized in that: In step S3, while the bending mechanism (20) is bending the steel pipe (100), the gas injection assembly (3) continues to replenish gas into the sealed inner cavity of the steel pipe (100). After the bending is completed, the gas injection assembly (3) stops injecting gas.

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