Pipe rib rolling machine

Abstract

The utility model provides a pipe rib rolling machine which comprises a machine frame and further comprises a main shaft, steel balls, an inner shaft, a pushing device and a driving device, the main shaft is rotationally installed on the machine frame, a center hole is formed in the main shaft, a sleeve hole is formed in the main shaft, and one or more ball hole sets are arranged on the side wall of the main shaft. The ball hole group comprises a plurality of steel ball holes which are communicated with the sleeve hole and are uniformly distributed in the circumferential direction; the steel balls are arranged in the steel ball holes and can radially move inwards or outwards; the inner shaft is arranged in the sleeve hole in a sleeved mode and can move in the axial direction, and a guide face is arranged on the side wall of the inner shaft. The pushing device is connected with the inner shaft and used for driving the inner shaft to move axially; the driving device is connected with the main shaft and used for driving the main shaft to rotate in the radial direction. The pipe rib rolling machine is compact in structure, small in size, low in manufacturing cost, stable in operation, good in rib rolling effect and wide in application range.

Description

Technical Field

[0001] This utility model relates to a pipe processing equipment, and more particularly to a pipe rolling machine. Background Technology

[0002] Pipe rolling machines are key equipment in the pipe processing industry. Their main function is to process continuous annular, spiral, or specific-shaped reinforcing ribs (rolling ribs) on the surface of pipes through mechanical rolling processes, thereby improving the mechanical properties, functionality, and applicability of the pipes. The currently used pipe rib forming method is as follows: A rotating wheel and a mandrel are selected according to the required dimensions. The mandrel is annular and can be embedded in a groove on the rotating wheel. The rotating wheel is positioned next to the mandrel, which is mounted on the machine tool's spindle. The steel pipe is fitted onto the mandrel. The rotating wheel is moved horizontally until it clamps the steel pipe. The machine tool is then started, the mandrel rotates at a uniform speed, and the rotating wheel feeds evenly, completing the rib forming at the pipe end.

[0003] Existing pipe forming machines are complex in structure, large in size, and expensive. Summary of the Invention

[0004] The technical problem to be solved by this utility model is to provide a pipe rolling machine that is compact in structure, small in size and has good performance.

[0005] This utility model provides a pipe rolling machine, which includes:

[0006] Frame 1 serves as the mounting platform;

[0007] The spindle 2 is rotatably mounted on the frame 1 for mounting the tube 10 to be processed. The spindle 2 has a central hole and a sleeve hole formed inside. The side wall of the spindle 2 is provided with one or more sets of ball hole groups. The ball hole group includes multiple steel ball holes 210 that communicate with the sleeve hole and are evenly distributed circumferentially.

[0008] The steel ball 23 is disposed within the steel ball hole 210 and can move radially inward or outward;

[0009] The inner shaft 5 is sleeved in the sleeve hole and can move axially. The side wall of the inner shaft 5 is provided with a guide surface for contacting the steel ball 23 and pushing the steel ball 23 outward so that it protrudes from the surface of the main shaft 2.

[0010] The pushing device 9 is connected to the inner shaft 5 and is used to drive the inner shaft 5 to move axially.

[0011] The drive device 4 is connected to the main shaft 2 and is used to drive the main shaft 2 to rotate radially.

[0012] Furthermore, there are 3-6 steel ball holes 210 located on the same radial plane.

[0013] Furthermore, the steel ball hole 210 is a tapered hole with a larger inner diameter and a smaller outer diameter.

[0014] Furthermore, the outer inner wall of the steel ball hole 210 is provided with a retaining ring for limiting the movement stroke of the steel ball 23.

[0015] Furthermore, the inner shaft 5 has a protruding guide portion 51 on its side wall, the guide portion having an inclined first guide surface 51a and a second guide surface parallel to the axis of the inner shaft.

[0016] Furthermore, the inner wall of the sleeve hole is provided with a strip groove 211 along the length direction. There are multiple strip grooves and they are evenly distributed around the circumference. The side wall of the inner shaft 5 is provided with a strip protrusion 52 corresponding to the strip groove 211. The guide surface is provided on the strip protrusion 52.

[0017] Furthermore, it also includes a bushing 3, which is rotatably mounted on the frame 1. The side wall of the bushing 3 is provided with a gear ring 31. The output end of the drive device 4 is provided with a gear or rack 41 that meshes with the gear ring 31 to drive the bushing 3 to rotate. The main shaft 2 is coaxially fixed to the end of the bushing 3. A pull rod coaxial with the inner shaft 5 is fitted inside the bushing 3. The head of the pull rod is rotatably connected to the inner shaft 5 and can rotate relative to it. The output end of the push device 9 is connected to the tail of the pull rod and is used to drive the pull rod to move axially.

[0018] Furthermore, a lever 91 is hinged to the frame 1, the output end of the pushing device 9 is connected to the head of the lever 91, and the tail of the lever 91 is hinged to the tail of the pull rod via a connecting rod 82.

[0019] Furthermore, an adapter 6 is provided between the pull rod and the inner shaft. The adapter 6 is rotatably mounted on the head of the pull rod, and the end of the inner shaft is threadedly connected to the adapter.

[0020] Furthermore, the driving device is a rack and pinion hydraulic cylinder, and the pushing device is a pneumatic cylinder or a hydraulic cylinder.

[0021] This utility model of a pipe rolling machine features an inner shaft with guide surfaces to radially push steel balls. It boasts a compact structure, ease of manufacturing, and stable and reliable operation. The design incorporates strip-shaped grooves and protrusions to ensure axial movement accuracy of the inner shaft while preventing relative rotation between the inner and main shafts, thus avoiding steel ball misalignment and improving the rolling effect. The double guide surface structure enhances the driving force during the outward movement of the steel balls. Furthermore, during rolling, the force transmitted from the steel balls to the guides is perpendicular to the axis of the inner shaft, preventing axial force from forming on the guides and causing them to deviate. The offset design ensures the positional accuracy of the steel balls during operation, improving the reliability and stability of processing. The optimized structural design facilitates the loading and unloading of the main shaft and inner shaft, allowing for easy replacement of the main shaft and inner shaft according to different pipe materials. This convenient and labor-saving design makes it widely applicable. The lever structure allows for changing the installation position of the pushing device, reducing the overall size and space required. Simultaneously, it improves transmission power and creates deceleration, achieving stable control of the inner shaft and ensuring the proper rolling of the pipe. This utility model pipe rolling machine features a compact structure, small size, low manufacturing cost, stable operation, good rolling effect, and wide applicability. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the pipe rolling machine of this utility model;

[0023] Figure 2 This is a partial enlarged view of the pipe rolling machine of this utility model;

[0024] Figure 3 for Figure 2 Enlarged view of section A in the middle;

[0025] Figure 4 for Figure 2 Enlarged view of section B;

[0026] Figure 5 This is a longitudinal sectional view of the main shaft of the pipe rolling machine of this utility model. Detailed Implementation

[0027] The embodiments of this utility model will now be described in detail with reference to the accompanying drawings.

[0028] See Figures 1-5 This utility model provides a pipe rolling machine for rolling pipes, including a frame 1, on which a main shaft 2, an inner shaft 5, a pushing device 9 and a driving device 4 are provided.

[0029] Among them, frame 1 serves as the mounting carrier for mounting other components.

[0030] The spindle 2 is rotatably mounted on the frame 1. In this embodiment, the spindle 2 is horizontally positioned and is used to mount the tube 10 to be processed. A central hole is formed inside the spindle 2, which forms a sleeve hole. One or more sets of ball hole groups are provided on the side wall of the spindle 2. When there are multiple sets, they are arranged sequentially along the axis of the spindle 2. Each set of ball hole groups includes a steel ball hole 210 communicating with the sleeve hole. There are multiple steel ball holes 210 and they are evenly distributed circumferentially. In this embodiment, each set of ball hole groups has 3-6 steel ball holes 210. The number of steel ball holes 210, which are circumferentially distributed and located on the same radial plane, is 3-6. The axis of the steel ball holes 210 is perpendicular to the axis of the main shaft 2. A steel ball 23 is provided in each steel ball hole 210. The steel ball 23 can move radially inward or outward. When moving outward, the steel ball 23 can protrude from the side wall of the main shaft 2 to achieve the rolling of the pipe. In this application, the diameter of the steel ball 23 is 6mm-8mm, and its maximum outward protrusion distance is 2mm-3mm.

[0031] During the rolling process, the rotation angle of the main shaft 2 is (360° / n) + (5° - 10°), where n is the number of steel balls on the same radial plane. For example, when n is 3, the rotation angle of the main shaft 2 is 360° / 3 + (5° - 10°) = 125° - 130°; or when n is 6, the rotation angle of the main shaft 2 is 360° / 6 + (5° - 10°) = 65° - 70°.

[0032] To prevent the steel ball 23 from accidentally falling out of the steel ball hole 210, in this application, the outer end of the steel ball hole 210 is narrowed, so that the diameter of the end of the steel ball hole 210 is smaller than the diameter of the steel ball, thereby preventing the steel ball 23 from sliding out of the steel ball hole 210; the steel ball hole 210 can be a tapered hole with a larger inner diameter (closer to the axis) and a smaller outer diameter (away from the axis); or it can be a cylindrical hole. At the same time, a retaining ring is provided on the inner wall of the outer side of the steel ball hole 210 to limit the movement stroke of the steel ball 23; thereby achieving the goal of preventing the steel ball 23 from falling out.

[0033] The inner shaft 5 is fitted inside the sleeve hole and can move axially. The side wall of the inner shaft 5 is provided with a guide surface corresponding to the steel ball 23. The guide surface is used to contact the steel ball 23 and push the steel ball 23 to move outward, thereby making the steel ball 23 protrude from the surface of the main shaft 2 to achieve rolling.

[0034] The pushing device 9 is connected to the inner shaft 5 and is used to drive the inner shaft 5 to move axially. In this application, the pushing device is a cylinder or a hydraulic cylinder. The driving device 4 is connected to the main shaft 2 and is used to drive the main shaft 2 to rotate radially. In this application, the driving device is a rack and pinion hydraulic cylinder.

[0035] A protruding guide portion 51 is provided on the side wall of the inner shaft 5. The guide portion has an inclined first guide surface 51a and a second guide surface parallel to the axis of the inner shaft. When the roller is rolled, the steel ball 23 contacts the second guide surface. At this time, the force transmitted by the steel ball to the guide portion 51 is perpendicular to the axis of the inner shaft 5, which prevents the axial force from being generated on the guide portion during the rolling process and causes it to deviate. This ensures the positional accuracy of the steel ball during the working process and improves the reliability and stability of the machining.

[0036] To facilitate processing and assembly, and to ensure the positional accuracy and reliability of the steel balls, this application provides a strip groove 211 on the inner wall of the sleeve hole. The strip groove 211 is straight, and its length direction is parallel to the axis of the main shaft 2. There are multiple strip grooves, which are evenly distributed circumferentially. Specifically, the number of strip grooves is the same as the number of steel ball holes on the same radial plane, and the steel ball holes 210 are connected to the strip groove 211. Correspondingly, a strip protrusion 52 corresponding to the strip groove 211 is provided on the side wall of the inner shaft 5. The strip protrusion 52 is fitted inside the strip groove 211 and can move axially. At the same time, it serves as a radial limit, that is, it ensures that the inner shaft can only move along the axis and does not rotate radially. A guide surface is provided on the strip protrusion 52, that is, a guide surface corresponding to the steel ball on the axial plane is provided on the side wall of each strip protrusion 52.

[0037] To facilitate processing and assembly, and to allow for easy replacement and adaptation to different specifications or types of pipes, this application also includes a bushing 3. The bushing 3 is cylindrical with central holes at both ends. It is rotatably mounted on the frame 1 via bearings. Specifically, bearings are provided at both ends of the bushing 3, serving as fulcrums for rotation and rotatably connected to the frame 1. A gear ring 31 is provided on the side wall of the bushing 3, located between the two bearings. A gear is provided at the output end of the drive device 4. Alternatively, a gear or rack 41 meshes with a gear ring 31 to drive the bushing 3 to rotate; simultaneously, the main shaft 2 is coaxially fixed to the end of the bushing 3. In this embodiment, the main shaft 2 is detachably installed at the end of the bushing 3 by bolts; specifically, the main shaft 2 includes a main shaft body 21, a sleeve hole is provided on the main shaft body 21, and the end of the main shaft body 21 extends radially outward to form a circular connecting part 22. A mounting hole is provided on the connecting part 22 to form a flange structure, and the main shaft is fixed to the end of the bushing 3 through the flange structure.

[0038] When the main spindle 2 is replaced, the inner spindle 5 also needs to be replaced accordingly. In order to facilitate the replacement of the inner spindle 5, in this application, an adapter 6 is provided between the pull rod and the inner spindle. The adapter 6 is cylindrical and coaxial with the inner spindle 5. One end of the adapter 6 is rotatably installed on the head of the pull rod, and the other end of the adapter 6 is connected to the end of the inner spindle through a thread.

[0039] A pull rod is fitted inside the bushing 3. The pull rod is coaxial with the inner shaft 5. The head of the pull rod is rotatably connected to the inner shaft 5. Therefore, the pull rod and the inner shaft 5 can rotate relative to each other. The output end of the pushing device 9 is connected to the tail of the pull rod to drive the pull rod to move axially, thereby realizing the axial drive of the inner shaft 5.

[0040] Specifically, the pull rod includes a first pull rod 71 and a second pull rod 72 that are connected to each other. The first pull rod 71 and the second pull rod 72 are connected by threads and are coaxially arranged. The first pull rod 71 is sleeved inside the bushing 3, and its head is connected to the inner shaft. The second pull rod 72 is located at the tail of the first pull rod 71 and is located outside the bushing 3 for connection with the pushing device.

[0041] To improve the overall structural compactness and reduce the space volume, especially the length dimension, this application includes a lever 91 hinged to the frame 1. This lever is located at the rear end of the pull rod, and its rotation axis is perpendicular to the axis of the inner shaft. The output end of the pushing device 9 is connected to the head of the lever 91, and the tail of the lever 91 is hinged to the tail of the pull rod via a connecting rod 82. In this application, the distance from the hinge point of the lever to the output end of the pushing device is greater than the distance between the hinge point of the lever and the connecting rod. Therefore, after the pushing device 9 passes through the lever, the force increases, ensuring that the inner shaft has sufficient axial force, thereby generating a sufficient force to push the steel ball outward, achieving reliable rolling of the roller frame. At the same time, through this lever, a transmission ratio is formed, effectively controlling the movement stroke of the drive shaft and ensuring stable processing of the pipe.

[0042] This utility model of a pipe rolling machine features an inner shaft with guide surfaces to radially push steel balls. It boasts a compact structure, ease of manufacturing, and stable and reliable operation. The design incorporates strip-shaped grooves and protrusions to ensure axial movement accuracy of the inner shaft while preventing relative rotation between the inner and main shafts, thus avoiding steel ball misalignment and improving the rolling effect. The double guide surface structure enhances the driving force during the outward movement of the steel balls. Furthermore, during rolling, the force transmitted from the steel balls to the guides is perpendicular to the axis of the inner shaft, preventing axial force from forming on the guides and causing them to deviate. The offset design ensures the positional accuracy of the steel balls during operation, improving the reliability and stability of processing. The optimized structural design facilitates the loading and unloading of the main shaft and inner shaft, allowing for easy replacement of the main shaft and inner shaft according to different pipe materials. This convenient and labor-saving design makes it widely applicable. The lever structure allows for changing the installation position of the pushing device, reducing the overall size and space required. Simultaneously, it improves transmission power and creates deceleration, achieving stable control of the inner shaft and ensuring the proper rolling of the pipe. This utility model pipe rolling machine features a compact structure, small size, low manufacturing cost, stable operation, good rolling effect, and wide applicability.

[0043] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A pipe rolling machine, characterized in that, include: The rack serves as the mounting platform; A spindle is rotatably mounted on the frame for mounting the tube to be processed. The spindle has a central hole and a sleeve hole formed inside. The side wall of the spindle is provided with one or more sets of ball hole groups. The ball hole group includes multiple steel ball holes that communicate with the sleeve hole and are evenly distributed circumferentially. A steel ball is disposed within the steel ball hole and can move radially inward or outward; An inner shaft is fitted inside the sleeve hole and can move axially. The side wall of the inner shaft is provided with a guide surface for contacting the steel ball and pushing the steel ball outward so that it protrudes from the surface of the main shaft. A pushing device, connected to the inner shaft, is used to drive the inner shaft to move axially; A drive unit is connected to the spindle and is used to drive the spindle to rotate radially.

2. The pipe rolling machine as described in claim 1, characterized in that: The number of steel ball holes located on the same radial plane is 3-6.

3. The pipe rolling machine as described in claim 1, characterized in that: The steel ball hole is a tapered hole with a larger inner diameter and a smaller outer diameter.

4. The pipe rolling machine as described in claim 1, characterized in that: The inner wall of the outer side of the steel ball hole is provided with a retaining ring to limit the movement of the steel ball.

5. The pipe rolling machine as described in claim 1, characterized in that: The inner shaft has a raised guide portion on its side wall, the guide portion having an inclined first guide surface and a second guide surface parallel to the axis of the inner shaft.

6. The pipe rolling machine as described in claim 1, characterized in that: The inner wall of the sleeve hole is provided with a strip groove along the length direction. There are multiple strip grooves and they are evenly distributed around the circumference. The side wall of the inner shaft is provided with a strip protrusion corresponding to the strip groove. The guide surface is disposed on the strip protrusion.

7. The pipe rolling machine as described in claim 1, characterized in that: It also includes a bushing, which is rotatably mounted on the frame. The bushing has a gear ring on its side wall. The output end of the drive device has a gear or rack that meshes with the gear ring to drive the bushing to rotate. The main shaft is coaxially fixed to the end of the bushing. A tie rod coaxial with the inner shaft is fitted inside the bushing. The head of the tie rod is rotatably connected to the inner shaft and can rotate relative to it. The output end of the push device is connected to the tail of the tie rod and is used to drive the tie rod to move axially.

8. The pipe rolling machine as described in claim 7, characterized in that: A lever is hinged to the frame, the output end of the pushing device is connected to the head of the lever, and the tail of the lever is hinged to the tail of the pull rod via a connecting rod.

9. The pipe rolling machine as described in claim 7, characterized in that: An adapter is provided between the pull rod and the inner shaft. The adapter is rotatably mounted on the head of the pull rod, and the end of the inner shaft is threadedly connected to the adapter.

10. The pipe rolling machine as described in claim 1, characterized in that: The driving device is a rack and pinion hydraulic cylinder, and the pushing device is a pneumatic cylinder or a hydraulic cylinder.

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