Pipe push bender and pipe bending method

Abstract

The application provides a pipeline push bending machine and a pipeline bending forming method, and relates to the technical field of pipeline manufacturing. The pipeline push bending machine comprises a driving arm, a main hydraulic cylinder, a rotating disc, a base disc, a first locking mechanism, a mandrel, a second locking mechanism and a pipe fitting positioning assembly. The first end of the driving arm is drivingly connected with the main hydraulic cylinder. The second end of the driving arm is used for clamping the pipe fitting and is rotationally connected with the mandrel. The mandrel penetrates the center of the rotating disc and the base disc from top to bottom. The pipe fitting positioning assembly is connected to the rotating disc, and is used for fixing the pipe fitting and conveying the pipe fitting towards the second end of the driving arm. The first locking mechanism is connected to the rotating disc, and is used for locking the rotating disc and the base disc. The second locking mechanism is connected to the driving arm, and is used for locking the driving arm and the rotating disc. The application realizes a step-by-step pipeline bending forming process, realizes pipeline bending in a larger range, improves the push bending capacity, and meets the production requirements of nuclear industry main pipeline products.

Description

Technical Field

[0001] This invention relates to the field of pipe manufacturing technology, and more specifically, to a pipe bending machine and a pipe bending and forming method. Background Technology

[0002] Currently, the more mature bending and forming processes for nuclear power pressure pipelines mainly include hot bending and cold bending, both of which are used. The problem with hot bending is that the grains in the billet become coarse during heating, affecting the mechanical properties of the main pipeline. The technical challenge of cold bending lies in controlling cracks and springback after bending.

[0003] Existing main pipeline bending machines suffer from insufficient bending capacity, failing to meet the requirements for bending and forming pipelines over a wider range. This severely restricts the research and development and production of main pipeline products in the nuclear industry, and has become a technical bottleneck in the processing of pressure pipelines in the nuclear industry. Summary of the Invention

[0004] To at least partially solve the above problems, in a first aspect, the present invention provides a pipe bending machine, comprising a drive arm, a main hydraulic cylinder, a rotating disk, a base disk, a first locking mechanism, a mandrel, a second locking mechanism, and a pipe positioning assembly. A first end of the drive arm is driven and connected to the main hydraulic cylinder. A second end of the drive arm is used to clamp a pipe and is rotatably connected to the mandrel. The mandrel passes through the centers of the rotating disk and the base disk sequentially from top to bottom. The pipe positioning assembly is connected to the rotating disk to fix the pipe and to convey the pipe toward the second end of the drive arm. The first locking mechanism is connected to the rotating disk to lock the rotating disk and the base disk. The second locking mechanism is connected to the drive arm to lock the drive arm and the rotating disk. The main hydraulic cylinder drives the second end of the drive arm to rotate horizontally around the mandrel, so that the second end of the drive arm is used to bend the pipe.

[0005] Optionally, the drive arm includes a drive arm body, a first end of which is connected to the main hydraulic cylinder for drive connection, and a second end of which is connected to a fixture. The fixture includes a movable chuck, a fixed chuck, and a circular fixture. The circular fixture is sleeved on the mandrel, the fixed chuck is connected to the circular fixture, and the movable chuck is connected to the second end of the drive arm body. The movable chuck is used to move toward or away from the fixed chuck.

[0006] Optionally, the pipe positioning assembly includes a chuck feed cylinder, a drive arm movable wedge, a drive arm wedge cylinder, a wedge, and a feed block. The chuck feed cylinder is connected to the drive arm body. The piston rod of the chuck feed cylinder faces the second end of the drive arm body and is hinged to the wedge. The wedge is connected to one end of the feed block, and the other end of the feed block is used to connect to the movable chuck. The drive arm wedge cylinder is connected to the base plate. The piston rod of the drive arm wedge cylinder is hinged to the drive arm movable wedge. The movement direction of the drive arm movable wedge is perpendicular to the movement direction of the movable chuck, so that the drive arm movable wedge and the wedge make sliding contact.

[0007] Optionally, it also includes a feeding mechanism, which includes a slide table, a base, a transverse feeding cylinder, a longitudinal feeding cylinder, and a template. The base is slidably mounted on the rotating disk, the slide table is slidably mounted on the base, the template is used to fix the pipe fitting, the template is used to slide on the slide table, the transverse feeding cylinder is connected to the base, and the piston rod of the transverse feeding cylinder is hinged to the base, the longitudinal feeding cylinder is connected to the base, and the piston rod of the longitudinal feeding cylinder is hinged to the slide table.

[0008] Optionally, a support frame is slidably mounted on the rotating disk, and a support frame feeding cylinder is connected to the rotating disk. The piston rod of the support frame feeding cylinder is hinged to the support frame. The device also includes a tail-top mechanism, which includes a sliding block and a tail-top cylinder. The tail-top cylinder is connected to the support frame, and the piston rod of the tail-top cylinder is hinged to the sliding block. The sliding block is used to connect with the template.

[0009] Optionally, the base plate is provided with a plurality of locking pin holes, and the first locking mechanism is used to be inserted into the locking pin holes to lock the rotating disk to the base plate.

[0010] Optionally, the rotating disk is provided with a plurality of rotating disk return pin holes, and the second locking mechanism is used to be inserted into the rotating disk return pin holes to lock the rotating disk and the drive arm.

[0011] Optionally, the first locking mechanism includes a locking pin cylinder and a locking pin. The locking pin cylinder is driven and connected to the rotating disk. The piston rod of the locking pin cylinder is connected to one end of the locking pin so that the other end of the locking pin is inserted into the locking pin hole.

[0012] Optionally, the second locking mechanism includes a first return pin, a connecting rod, and a second return pin. The second end of the drive arm is provided with two return pin holes. The first return pin and the second return pin are connected by the connecting rod and are respectively inserted into the two return pin holes.

[0013] Secondly, embodiments of the present invention also provide a pipe bending and forming method, using the pipe bending machine described above, comprising the following steps:

[0014] S1: The rotating disk is locked to the base disk by the first locking mechanism;

[0015] S2: The main hydraulic cylinder pushes the first end of the drive arm, causing the second end of the drive arm to rotate horizontally clockwise around the spindle by a preset angle, thereby driving the front section of the tube to bend and form.

[0016] S3: The first locking mechanism releases the lock between the rotating disk and the base disk, and the second locking mechanism locks the drive arm to the rotating disk;

[0017] S4: The hydraulic cylinder returns, causing the second end of the drive arm to rotate horizontally counterclockwise around the spindle by a preset angle, which in turn drives the rotating disk to rotate horizontally counterclockwise by a preset angle.

[0018] S5: The second locking mechanism releases the drive arm from the rotating disk, and the first locking mechanism locks the rotating disk back into the base disk. The main hydraulic cylinder continues to push until the pipe reaches the specified angle.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] First, the rotating disk is locked to the base disk by the first locking mechanism. The main hydraulic cylinder pushes the first end of the drive arm, causing the second end of the drive arm to rotate horizontally clockwise around the mandrel by a preset angle. Since the rotating disk is locked to the base disk, the pipe positioning assembly on the rotating disk cannot rotate. The pipe positioning assembly fixes the middle and rear sections of the pipe. Because the front section of the pipe is clamped by the second end of the drive arm, the front section of the pipe is bent and shaped. Then, the first locking mechanism releases the lock between the rotating disk and the base disk. The second locking mechanism locks the drive arm to the rotating disk. The main hydraulic cylinder returns, causing the second end of the drive arm to rotate horizontally counterclockwise around the mandrel by a preset angle, causing the rotating disk to rotate horizontally counterclockwise by a preset angle. The second locking mechanism releases the lock between the drive arm and the rotating disk. The first locking mechanism locks the rotating disk to the base disk again. The main hydraulic cylinder pushes until the pipe reaches the specified angle. In summary, this invention realizes a step-by-step pipe bending forming process, enabling a wider range of pipe bending, improving bending capacity, and meeting the production needs of main pipeline products in the nuclear industry. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the pipe bending machine according to an embodiment of the present invention;

[0022] Figure 2 This is a structural schematic diagram of the pipe bending machine according to another embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the installation of the main hydraulic cylinder in the pipe bending machine according to an embodiment of the present invention;

[0024] Figure 4 This is a partial top view of the main hydraulic cylinder in the pipe bending machine according to an embodiment of the present invention;

[0025] Figure 5 This is a top view of the main hydraulic cylinder in the pipe bending machine according to an embodiment of the present invention;

[0026] Figure 6 This is a schematic diagram of the second locking mechanism in the pipe bending machine according to an embodiment of the present invention;

[0027] Figure 7 This is a schematic diagram of the fixture in the pipe bending machine according to an embodiment of the present invention;

[0028] Figure 8 This is a schematic diagram of the installation of the support frame feed cylinder in the pipe bending machine according to an embodiment of the present invention;

[0029] Figure 9 This is a schematic diagram of the feeding mechanism and tail-end mechanism in the pipe bending machine according to an embodiment of the present invention;

[0030] Figure 10 This is a schematic diagram of the first locking mechanism in the pipe bending machine according to an embodiment of the present invention;

[0031] Figure 11 This is a schematic diagram of the rotating disc and the base disc in the pipe bending machine according to an embodiment of the present invention.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Drive arm; 2. Main hydraulic cylinder; 3. Rotary disc; 4. Feeding mechanism; 5. Tail-end mechanism; 6. Base plate; 7. First locking mechanism; 8. Mandrel; 9. Fixture; 10. Drive arm body; 11. Chuck feed cylinder; 12. Drive arm movable wedge; 13. Drive arm wedge cylinder; 14. Wedge; 15. Feed block; 16. Movable chuck; 17. Fixed chuck; 18. Pipe fitting; 19. Return pin hole; 20. Wear-resistant block; 21. First return pin; 22. Support frame feed cylinder; 23. Support frame; 24. Rotary disc wedge cylinder; 25. Rotary disc movable wedge 26. Second locking mechanism; 27. Connecting rod; 28. Template; 29. ​​Slide table; 30. Base; 31. Horizontal feeding cylinder; 32. Longitudinal feeding cylinder; 33. Sliding block; 34. Tail top cylinder; 36. Anchor bolt; 37. Base plate body; 38. Upper triangular support frame; 39. Tie rod; 40. Pin shaft; 41. Locking pin hole; 42. Wear-resistant steel sleeve; 43. Arc-shaped copper sliding plate; 44. Locking pin cylinder; 45. Locking pin; 48. Round jig; 49. Key; 52. Rotating disk fixing wedge block; 53. Rotating disk return pin hole; 55. Second return pin. Detailed Implementation

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0036] In the description of this specification, the references to terms such as "embodiment," "one embodiment," "some implementations," "exemplary," and "one implementation," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or implementation is included in at least one embodiment or implementation of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or implementation. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or implementations.

[0037] The terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature.

[0038] In the attached figures, the Z-axis represents the vertical direction, i.e., up and down, with the positive Z-axis indicating up and the negative Z-axis indicating down; the X-axis represents the horizontal direction, designated as left and right, with the positive X-axis indicating the right side and the negative X-axis indicating the left side; the Y-axis represents the front and back direction, with the positive Y-axis indicating the front and the negative Y-axis indicating the back. It should be noted that the aforementioned representations of the Z, Y, and X axes are merely for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the invention.

[0039] like Figure 1 and Figure 2 As shown, this embodiment of the invention provides a pipe bending machine, including a drive arm 1, a main hydraulic cylinder 2, a rotating disk 3, a base disk 6, a first locking mechanism 7, a mandrel 8, a second locking mechanism 26, and a pipe positioning assembly. The first end of the drive arm 1 is driven and connected to the main hydraulic cylinder 2. The second end of the drive arm 1 is used to clamp the pipe 18 and is rotatably connected to the mandrel 8. The mandrel 8 passes through the center of the rotating disk 3 and the base disk 6 from top to bottom. The pipe positioning assembly is connected to the rotating disk 3 to fix the pipe 18 and to convey the pipe 18 toward the second end of the drive arm 1. The first locking mechanism 7 is connected to the rotating disk 3 to lock the rotating disk 3 and the base disk 6. The second locking mechanism 26 is connected to the drive arm 1 to lock the drive arm 1 and the rotating disk 3. The main hydraulic cylinder 2 is used to drive the second end of the drive arm 1 to rotate horizontally around the mandrel 8 so that the second end of the drive arm 1 can bend the pipe 18.

[0040] Specifically, the horizontal rotation of the second end of the drive arm 1 around the mandrel 8 refers to rotation in the XY plane shown in the figure. The mandrel 8 serves as the rotational support shaft for the drive arm 1 and the rotating disk 3, passing through the base disk 6, the rotating disk 3, and the fixture 9, and bearing the support load during the bending process. The mandrel 8 comes in various specifications based on its diameter. Different mandrels can be replaced by installing a support sleeve on the outside of the mandrel 8. A copper sleeve can be installed inside the support sleeve to cooperate with the mandrel 8. The rotating pair between the copper sleeve and the mandrel 8 is intermittently lubricated by an automatic lubrication system. The main hydraulic cylinder 2 is hinged to the support of the base disk 6 via a bearing seat. The main hydraulic cylinder 2 and the base disk 6 are hinged by a cylinder head trunnion, which is installed vertically, allowing the main hydraulic cylinder 2 to swing horizontally. A copper sleeve bearing, lubricated with dry oil, is installed between the trunnion and the bearing seat. A hinge joint is installed at the end of the piston rod of the main hydraulic cylinder 2, which pushes the drive arm 1 to rotate around the mandrel 8, providing thrust for pipe bending. The stroke of the main hydraulic cylinder 2 can meet the needs of workpiece deformation and springback. Anti-rotation plates are installed between the piston rod and the hinge joint of the main hydraulic cylinder 2 to prevent relative rotation between the piston rod and the hinge joint.

[0041] In this embodiment, the rotating disk 3 and the base disk 6 are first locked by the first locking mechanism 7. The main hydraulic cylinder 2 pushes the first end of the drive arm 1, causing the second end of the drive arm 1 to rotate horizontally clockwise around the spindle 8 by a preset angle. Since the rotating disk 3 is locked on the base disk 6, the pipe positioning component on the rotating disk 3 cannot rotate. The pipe positioning component fixes the middle and rear sections of the pipe 18. Since the front section of the pipe 18 is clamped by the second end of the drive arm 1, the front section of the pipe 18 is bent and shaped. Then, the locking between the rotating disk 3 and the base disk 6 is released by the first locking mechanism 7. The drive arm 1 and the rotating disk 3 are locked by the second locking mechanism 26. The main hydraulic cylinder 2 returns, causing the second end of the drive arm 1 to rotate horizontally counterclockwise around the spindle 8 by a preset angle. This causes the rotating disk 3 to rotate horizontally counterclockwise by a preset angle. The locking between the drive arm 1 and the rotating disk 3 is released by the second locking mechanism 26. The rotating disk 3 and the base disk 6 are locked again by the first locking mechanism 7. The main hydraulic cylinder 2 pushes until the pipe 18 reaches the specified angle. In summary, this invention realizes a step-by-step pipe bending forming process, enabling a wider range of pipe bending, improving bending capacity, and meeting the production needs of main pipeline products in the nuclear industry.

[0042] like Figure 3 , Figure 4 and Figure 5 As shown, optionally, the drive arm 1 includes a drive arm body 10. The first end of the drive arm body 10 is used for drive connection with the main hydraulic cylinder 2. The second end of the drive arm body 10 is connected to a fixture 9. The fixture 9 includes a movable clamp 16, a fixed clamp 17 and a circular fixture 48. The circular fixture 48 is sleeved on the spindle 8. The fixed clamp 17 is connected to the circular fixture 48. The movable clamp 16 is connected to the second end of the drive arm body 10 and is used to move towards or away from the fixed clamp 17.

[0043] Specifically, the fixture 9 consists of a circular fixture 48, a fixed chuck 17, a movable chuck 16, and a template 28. The circular fixture 48 is installed inside the drive arm 1 and is positioned with the drive arm 1 via keys 49 on its upper and lower end faces. A copper sleeve is located at the center of the circular fixture 48, which cooperates with the mandrel 8, allowing it to rotate around the mandrel 8 together with the drive arm 1 during operation. The fixed chuck 17 is fixed to the circular fixture 48 and positioned by a stop and key 49. The movable chuck 16 is installed inside the drive arm 1 and is moved forward and backward by the chuck feeding cylinder 11, contacting or separating from the pipe fitting 18. The template 28 is used to fix the pipe fitting 18, contacting the pipe fitting 18 during the feeding process and during the bending process, and is fed in together with the pipe fitting 18. It should be noted that a special jig 9 is required for the pipe fitting 18 with a nozzle. Before bending, the round jig 48, the fixed clamp 17, and the movable clamp 16 need to be replaced accordingly.

[0044] like Figure 4 and Figure 5 As shown, optionally, the pipe positioning assembly includes a chuck feeding cylinder 11, a drive arm movable wedge 12, a drive arm wedge cylinder 13, a wedge 14, and a feeding block 15. The chuck feeding cylinder 11 is connected to the drive arm body 10. The piston rod of the chuck feeding cylinder 11 faces the second end of the drive arm body 10 and is hinged to the wedge 14. The wedge 14 is connected to one end of the feeding block 15, and the other end of the feeding block 15 is used to connect to the movable chuck 16. The drive arm wedge cylinder 13 is connected to the base plate 6. The piston rod of the drive arm wedge cylinder 13 is hinged to the drive arm movable wedge 12. The movement direction of the drive arm movable wedge 12 is perpendicular to the movement direction of the movable chuck 16, so that the drive arm movable wedge 12 and the wedge 14 slide in contact.

[0045] Specifically, the drive arm body 10 is an integral structural component. A chuck feed cylinder 11 is horizontally mounted inside the drive arm body 10, with its piston rod hinged to a wedge block 14. The wedge block 14 is embedded in a feed block 15, and a movable chuck 16 is mounted at the front of the feed block 15. Driven by the chuck feed cylinder 11, the wedge block 14, feed block 15, and movable chuck 16 can move forward and backward along a guide rail, opening and closing the movable chuck 16 and the fixed chuck 17, thereby clamping and releasing the pipe fitting 18. A guide rail for the forward and backward movement of the movable chuck 16 is mounted on the drive arm body 10, providing precise guidance for the forward and backward movement of the movable chuck 16.

[0046] In this embodiment, the movable wedge 12 of the drive arm can be located on the side of the drive arm body 10, and its movement direction is perpendicular to the movement direction of the movable chuck 16. Driven by the horizontally hinged drive arm wedge cylinder 13, the movable wedge 12 moves forward and backward along the guide rail. After the movable wedge 12 reaches its position, it engages with the wedge 14. The inclined surface of the wedge has a self-locking angle, enabling self-locking. The straight surface of the movable wedge engages with the wear-resistant block 20. Under the thrust of the drive arm wedge cylinder 13, the movable wedge 12 clamps the pipe through the reaction force of the inclined surfaces between the wedges. This process can be achieved by controlling the cylinder movement through an automatic control program. The cylinder stroke is detected by a displacement sensor, and the movement distance can be precisely controlled. A proximity switch is used for detection at the limit positions.

[0047] like Figure 7 , Figure 8 and Figure 9As shown, optionally, the pipe bending machine also includes a feeding mechanism 4. The feeding mechanism 4 includes a slide table 29, a base 30, a transverse feeding cylinder 31, a longitudinal feeding cylinder 32, and a template 28. The base 30 is slidably mounted on the rotating disk 3, the slide table 29 is slidably mounted on the base 30, the template 28 is used to fix the pipe fitting 18, and the template 28 is used to slide on the slide table 29. The transverse feeding cylinder 31 is connected to the base 30, and the piston rod of the transverse feeding cylinder 31 is hinged to the base 30. The longitudinal feeding cylinder 32 is connected to the base 30, and the piston rod of the longitudinal feeding cylinder 32 is hinged to the slide table 29.

[0048] like Figure 7 , Figure 8 and Figure 9 As shown, optionally, a support frame 23 is slidably arranged on the rotating disk 3, and a support frame feeding cylinder 22 is connected to the rotating disk 3. The piston rod of the support frame feeding cylinder 22 is hinged to the support frame 23. The pipe bending machine also includes a tail top mechanism 5, which includes a sliding block 33 and a tail top cylinder 34. The tail top cylinder 34 is connected to the support frame 23, and the piston rod of the tail top cylinder 34 is hinged to the sliding block 33. The sliding block 33 is used to connect with the template 28.

[0049] Specifically, the rotating disk 3 is installed on the upper part of the base disk 6. During the bending and forming process of the pipe 18, the rotating disk 3 is locked together with the base disk 6 and remains stationary, bearing the deformation resistance and friction of the pipe 18. After the bending is completed, the rotating disk return pin holes 53 evenly distributed on the rotating disk 3 and the return pin holes 19 on the drive arm body 10 are locked by the first return pin 21. Then, under the drive of the main hydraulic cylinder 2, it can rotate counterclockwise around the mandrel 8 at a certain angle until the first locking mechanism 7 on the rotating disk 3 is aligned with the next locking hole on the base disk 6. The two are locked together again, and the next bending begins. This can realize the step-by-step bending and forming of the pipe 18.

[0050] In this embodiment, the support frame 23 is fed in and returned by the support frame feeding cylinder 22; the rotating disk wedge block cylinder 24 moves the rotating disk movable wedge block 25 forward and backward. The support frame feeding cylinder 22 drives the support frame 23 forward, so that the sliding block 33 of the tail-top mechanism 5 at the front of the support frame 23 contacts the template 28 and stops. The template 28 and the sliding block 33 are positioned by the stop and transfer the load. The rotating disk wedge block cylinder 24 drives the rotating disk movable wedge block 25 forward, and after contacting the inclined surface of the rotating disk fixed wedge block 52, it continues to move forward a certain distance to clamp the support frame, providing reaction force support for the bending of the pipe fitting 18. The cylinder stroke is detected by a displacement sensor, and the moving distance can be precisely controlled. A first locking mechanism 7 is provided on the rotating disk 3 for automatic locking of the rotating disk 3 during the bending operation. The starting position of the feeding is adjusted for pipe fittings 18 with different bending radii. The transverse and longitudinal movements of the pipe fitting 18 and the template 28 are achieved by the transverse feeding cylinder 31 and the longitudinal feeding cylinder 32. The cylinder stroke is detected by a displacement sensor, and the movement distance can be precisely controlled. The tail-top mechanism 5 is mounted on the support frame 23 of the rotating disk 3 to provide tail-top support force for the sliding block 33 and the template 28, overcoming the frictional resistance between the sliding block 33 and the support frame 23, so that the template 28 and the pipe fitting 18 will not slide relative to each other during operation, realizing the follow-up movement of the template 28 and the pipe fitting 18. The tail-top mechanism 5 on the support frame 23 is fed into place by the support frame feeding cylinder 22, so that the sliding block 33 and the template 28 are combined into one unit, and the load is transmitted through the stop. There are two tail-top cylinders 34, one on the top and one on the bottom, mounted on the support frame 23, and connected to the sliding block 33 by ball joints. The sliding block 33 moves back and forth through the dovetail guide. The pressure of the tail-top cylinder 34 is adjustable to meet the tail-top force requirements of different pipe fittings 18 forming.

[0051] like Figure 5 As shown, optionally, the base plate 6 is provided with a plurality of locking pin holes 41, and the first locking mechanism 7 is inserted into the locking pin holes 41 to lock the rotating plate 3 to the base plate 6.

[0052] Specifically, the base plate 6 is installed on the factory foundation, serving as the overall mounting bracket for the equipment, and is connected to the concrete foundation via anchor bolts 36. Together with the mandrel 8 and jig 9, it forms a closed load-bearing frame to withstand the working load. The base plate 6 mainly consists of two parts: the base plate body 37 and the upper triangular support frame 38. The base plate body 37 is a modular structure, with the parts positioned using stop joints and pre-tightened into a whole by tie rods 39. The upper triangular support frame 38 provides stable support and balances the force on the mandrel 8, and is connected to the base plate 6 and mandrel 8 via a 40-pin.

[0053] In this embodiment, a plurality of locking pin holes 41 are arranged at 10-degree intervals, and there are a total of 19 holes. Wear-resistant steel sleeves 42 can be installed in the locking pin holes 41 to withstand the locking force during the bending process.

[0054] In another embodiment, an arc-shaped copper sliding plate 43 can be provided in the central area and arc-shaped section area of ​​the base plate 6, and lubricated with grease to improve the wear resistance of the contact areas between the rotating disk 3 and the drive arm 1 and the base plate 6 during movement. The arc-shaped copper sliding plate 43 is segmented, making it easy to replace after wear.

[0055] like Figure 5 As shown, optionally, the rotating disk 3 is provided with a plurality of rotating disk return pin holes 53, and the second locking mechanism 26 is used to be inserted into the rotating disk return pin holes 53 to lock the rotating disk 3 and the drive arm 1.

[0056] like Figure 10 As shown, optionally, the first locking mechanism 7 includes a locking pin cylinder 44 and a locking pin 45. The locking pin cylinder drive 44 is connected to the rotating disk 3. The piston rod of the locking pin cylinder 44 is connected to one end of the locking pin 45 so that the other end of the locking pin 45 is inserted into the locking pin hole 41.

[0057] Specifically, the first locking mechanism 7 is mounted on the rotating disk 3. The locking pin 45 is lowered and raised by the locking pin cylinder 44, thereby locking and unlocking the rotating disk 3 and the base disk 6. During the bending process, the locking pin 45 is at the lower position, and the rotating disk 3 and the base disk 6 are in a locked state. During the rotation of the rotating disk, the locking pin 45 is at the upper position, in an open state. The upper and lower limit positions of the locking pin cylinder 44 are detected by a proximity switch.

[0058] like Figure 6 and Figure 11 As shown, optionally, the second locking mechanism 26 includes a first return pin 21, a connecting rod 27 and a second return pin 55. The second end of the drive arm 1 is provided with two return pin holes 19. The first return pin 21 and the second return pin 55 are connected by the connecting rod 27 and are respectively inserted into the two return pin holes 19.

[0059] Specifically, the rotating disk is equipped with multiple return pin holes 53, arranged at 10-degree intervals, for a total of 20 holes. After the locking pin 45 is raised to the top dead center, the first return pin 21 and the second return pin 55 are manually placed at the corresponding positions of the return pin holes 19 and 53, respectively. The two return pins are connected by the connecting rod 27. The length of the connecting rod 27 is adjusted to ensure a tight connection between the rotating disk 3 and the drive arm 1. The main hydraulic cylinder 2 returns, and the drive arm 1 drives the rotating disk 3 to rotate counterclockwise. Before the locking pin 45 is inserted after the main hydraulic cylinder 2 has finished its return stroke, the first return pin 21 must be manually removed.

[0060] This invention also provides a pipe bending and forming method, using the pipe bending machine described above, including the following steps:

[0061] Step 1: Tighten the locking pin at 45 degrees.

[0062] The first locking mechanism 7 on the rotating disk 3 is activated, and the locking pin 45 is inserted into the pin hole on the base disk 6 through the locking pin cylinder 44, thereby realizing the locking and fixing of the rotating disk 3 and the base disk 6.

[0063] Step 2: Automatic feeding

[0064] The pipe fitting 18 is fixed together with the template 28 in the set position using a special pipe clamp. Then, the pipe fitting 18 and the template 28 are hoisted to the slide table 29 of the feeding mechanism 4 by an overhead crane. The feeding mechanism 4 is positioned by a stop plate and can move forward in the plane in the X and Y axes according to the set distances. It stops after reaching the clamping position of the pipe fitting 18.

[0065] Step 3: Automatic clamping of pipe fitting 18

[0066] The chuck feeding cylinder 11 drives the movable chuck 16 forward, and stops after contacting the pipe fitting 18. The drive arm wedge block cylinder 13 drives the drive arm movable wedge block 12 forward, and continues to move forward a distance after contacting the inclined surface of the wedge block 14 to clamp the pipe fitting 18.

[0067] Step 4: Support frame 23 automatically locks.

[0068] The support frame feeding cylinder 22 drives the support frame 23 forward, so that the sliding block 33 at the front of the support frame 23 contacts the template 28 and stops; the rotating disk wedge block cylinder 24 drives the rotating disk movable wedge block 25 forward, and after contacting the inclined surface of the rotating disk fixed wedge block 52, it continues to move forward a distance to clamp the support frame 23, providing reaction force support for the bending of the pipe fitting 18.

[0069] Step 5: Main hydraulic cylinder 2 advances and maintains pressure.

[0070] The main hydraulic cylinder 2 can be pushed in two modes:

[0071] Intermittent mode: Within the stroke range of the main hydraulic cylinder 2, the cylinder moves forward, stops, holds pressure, moves forward, stops, holds pressure, etc., according to a pre-set program. This process is repeated until the main hydraulic cylinder 2 reaches the stroke limit and stops, thus realizing the bending operation of the pipe fitting 18 under automatic program control.

[0072] Continuous mode: Within the stroke range of the main hydraulic cylinder 2, it works continuously according to the set program until the main hydraulic cylinder 2 reaches the stroke limit and stops, realizing the bending operation of the pipe fitting 18 under automatic program control.

[0073] Step Six: Depressurize main hydraulic cylinder 2, and pipe fitting 18 springs back.

[0074] After the main hydraulic cylinder 2 finishes holding pressure, it releases pressure and at the same time the pipe fitting 18 begins to spring back. After the pipe fitting 18 finishes springing back, the main hydraulic cylinder 2 stops returning.

[0075] Step 7: Open the second locking mechanism 26 and place the first return pin 21 and the second return pin 55.

[0076] Locking pin cylinder 44 drives locking pin 45 to lift, causing rotating disk 3 to disengage from base disk 6. First return pin 21, second return pin 55 and connecting rod 27 are placed at corresponding positions of return pin hole 53 and return pin hole 19 of rotating disk. The length of connecting rod 27 is adjustable. Rotating disk 3 and drive arm 1 are connected together through first return pin 21, second return pin 55 and connecting rod 27.

[0077] Step 8: The main hydraulic cylinder returns to its second stroke, driving the rotating disc to rotate.

[0078] When the main hydraulic cylinder 2 returns, it drives the drive arm 1 to rotate the rotating disk 3 counterclockwise by a certain angle, so that the first locking mechanism 7 on the rotating disk 3 is aligned with the next adjacent locking pin hole 41 on the base disk 6. Then the first locking mechanism 7 is activated, and the locking pin cylinder 44 inserts the locking pin 45 into the locking pin hole 41 on the base disk 6 to lock the rotating disk 3 and the base disk 6. After that, the second locking mechanism 26 connecting the drive arm 1 and the rotating disk 3 is opened.

[0079] Step 9: Main hydraulic cylinder 2 advances, starting the next propulsion cycle.

[0080] The main hydraulic cylinder 2 moves forward, pushing the drive arm 1 to advance according to the set program until the pipe 18 reaches the specified angle.

[0081] While the present invention has been disclosed above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention, and all such changes and modifications will fall within the scope of protection of the present invention.

Claims

1. A pipe bending machine, characterized in that, The system includes a drive arm (1), a main hydraulic cylinder (2), a rotating disk (3), a base disk (6), a first locking mechanism (7), a mandrel (8), a second locking mechanism (26), and a pipe positioning assembly. The first end of the drive arm (1) is driven and connected to the main hydraulic cylinder (2). The second end of the drive arm (1) is used to clamp the pipe (18) and is rotatably connected to the mandrel (8). The mandrel (8) passes through the center of the rotating disk (3) and the base disk (6) from top to bottom. The pipe positioning assembly is connected to the rotating disk (3) to fix the pipe. The first locking mechanism (7) is connected to the rotating disk (3) to lock the rotating disk (3) and the base disk (6), and the second locking mechanism (26) is connected to the driving arm (1) to lock the driving arm (1) and the rotating disk (3). The main hydraulic cylinder (2) is used to drive the second end of the driving arm (1) to rotate horizontally around the spindle (8) so that the second end of the driving arm (1) can be used to drive the pipe (18) to bend. The drive arm (1) includes a drive arm body (10), the first end of which is used to drive the connection with the main hydraulic cylinder (2), and the second end of which is connected to a fixture (9). The fixture (9) includes a movable clamp (16), a fixed clamp (17), and a round fixture (48). The round fixture (48) is sleeved on the mandrel (8), the fixed clamp (17) is connected to the round fixture (48), and the movable clamp (16) is connected to the second end of the drive arm body (10). The movable clamp (16) is used to move toward or away from the fixed clamp (17). The pipe positioning assembly includes a chuck feeding cylinder (11), a drive arm movable wedge (12), a drive arm wedge cylinder (13), a wedge (14), and a feeding block (15). The chuck feeding cylinder (11) is connected to the drive arm body (10). The piston rod of the chuck feeding cylinder (11) faces the second end of the drive arm body (10) and is hinged to the wedge (14). The wedge (14) is connected to one end of the feeding block (15), and the other end of the feeding block (15) is used to connect to the movable chuck (16). The drive arm wedge cylinder (13) is connected to the base plate (6). The piston rod of the drive arm wedge cylinder (13) is hinged to the drive arm movable wedge (12). The movement direction of the drive arm movable wedge (12) is perpendicular to the movement direction of the movable chuck (16) so that the drive arm movable wedge (12) and the wedge (14) slide in contact.

2. The pipe bending machine as described in claim 1, characterized in that, It also includes a feeding mechanism (4), which includes a slide (29), a base (30), a transverse feeding cylinder (31), a longitudinal feeding cylinder (32), and a template (28). The base (30) is slidably disposed on the rotating disk (3), the slide (29) is slidably disposed on the base (30), the template (28) is used to fix the pipe fitting (18), the template (28) is used to slide on the slide (29), the transverse feeding cylinder (31) is connected to the base (30), the piston rod of the transverse feeding cylinder (31) is hinged to the base (30), the longitudinal feeding cylinder (32) is connected to the base (30), and the piston rod of the longitudinal feeding cylinder (32) is hinged to the slide (29).

3. The pipe bending machine as described in claim 2, characterized in that, A support frame (23) is slidably mounted on the rotating disk (3). A support frame feeding cylinder (22) is connected to the rotating disk (3). The piston rod of the support frame feeding cylinder (22) is hinged to the support frame (23). The rotating disk (3) also includes a tail top mechanism (5). The tail top mechanism (5) includes a sliding block (33) and a tail top cylinder (34). The tail top cylinder (34) is connected to the support frame (23). The piston rod of the tail top cylinder (34) is hinged to the sliding block (33). The sliding block (33) is used to connect with the template (28).

4. The pipe bending machine as described in claim 1, characterized in that, The base plate (6) is provided with a plurality of locking pin holes (41), and the first locking mechanism (7) is inserted into the locking pin holes (41) to lock the rotating plate (3) and the base plate (6).

5. The pipe bending machine as described in claim 1, characterized in that, The rotating disk (3) is provided with a plurality of rotating disk return pin holes (53), and the second locking mechanism (26) is used to be inserted into the rotating disk return pin holes (53) to lock the rotating disk (3) and the drive arm (1).

6. The pipe bending machine as described in claim 4, characterized in that, The first locking mechanism (7) includes a locking pin cylinder (44) and a locking pin (45). The locking pin cylinder (44) is driven and connected to the rotating disk (3). The piston rod of the locking pin cylinder (44) is connected to one end of the locking pin (45) so that the other end of the locking pin (45) is inserted into the locking pin hole (41).

7. The pipe bending machine as described in claim 5, characterized in that, The second locking mechanism (26) includes a first return pin (21), a connecting rod (27) and a second return pin (55). The second end of the drive arm (1) is provided with two return pin holes (19). The first return pin (21) and the second return pin (55) are connected by the connecting rod (27) and respectively inserted into the two return pin holes (19).

8. A method for bending and forming a pipe, characterized in that, Using the pipe bending machine as described in any one of claims 1-7, the steps include: S1: The rotating disk (3) is locked to the base disk (6) by the first locking mechanism (7); S2: The main hydraulic cylinder (2) pushes the first end of the drive arm (1) so that the second end of the drive arm (1) rotates horizontally clockwise around the spindle (8) by a preset angle, thereby driving the front section of the pipe (18) to bend and form. S3: The locking between the rotating disk (3) and the base disk (6) is released by the first locking mechanism (7), and the driving arm (1) is locked to the rotating disk (3) by the second locking mechanism (26). S4: The main hydraulic cylinder (2) returns, causing the second end of the drive arm (1) to rotate horizontally counterclockwise around the spindle (8) by a preset angle, which drives the rotating disk (3) to rotate horizontally counterclockwise by a preset angle in sync. S5: The locking of the drive arm (1) and the rotating disk (3) is released by the second locking mechanism (26), and the rotating disk (3) and the base disk (6) are locked again by the first locking mechanism (7). The main hydraulic cylinder (2) continues to push until the pipe (18) reaches the specified angle.

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