Automatic positioning, welding and cutting device for metal tubular objects
By using a cam-driven electric switch in conjunction with a measuring disc, the problem of inconsistent lengths in high-speed pipe cutting was solved, enabling precise cutting and rapid welding, and improving the cutting accuracy and yield of the device.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- ZHANGJIAKOU RUITAI MASCH CO LTD
- Filing Date
- 2026-03-11
- Publication Date
- 2026-06-05
AI Technical Summary
Existing technologies make it difficult to achieve precise cutting during high-speed pipe manufacturing, resulting in significant differences in pipe length. Furthermore, the cutting devices are bulky and have high acceleration forces, making it difficult to control the consistency of the cutting length.
A cam-driven electric switch device works in conjunction with a measuring disc to transmit the tube travel distance via gears, precisely controlling the start-up timing of the cutting device. An adjustable switch and adjustment mechanism ensure accurate positioning of the cutting point.
It achieves precise control of pipe cutting length, reduces length differences, increases cutting and welding speed, reduces the risk of damage to pipes by the device, and improves yield.
Smart Images
Figure CN122142407A_ABST
Abstract
Description
Technical Field
[0001] This invention relates to a welding apparatus, and more particularly to an automatic positioning welding and cutting apparatus for metal tubular objects. Background Technology
[0002] In processes such as continuous pipe manufacturing, the pipe cutting operation presents significant challenges because it often needs to be performed while the pipe is traveling at high speeds (e.g., 40 meters per minute or more). For this purpose, a cutting device called a "flying shear" is typically used, which moves parallel to the pipe at a given moment. If the feed rate of the cutting device equals the feed rate of the pipe, a rotating steel blade or similar tool is used to cut the pipe.
[0003] The starting pulse for the cutting device comes from a device that measures the length of the pipe that has advanced relative to the cutting device. Given that flying shears are typically very bulky and require enormous force to accelerate to high speeds, it is difficult to cut pipes into equal lengths; the differences in pipe length are often significant. Summary of the Invention
[0004] The purpose of this invention is to overcome the shortcomings of existing technologies. This device minimizes the length difference between cut parts. It is primarily used in automatic pipe welding machines for cutting pipes and is an automatic positioning and welding cutting device for metal tubular objects.
[0005] To achieve the aforementioned objective, a significant feature of this invention is a device for coupling a flying shear device to the pipe during pipe advance. This coupling is achieved via two cam-driven electrical switches mounted on a measuring disc, which is rotated by the pipe via an intermediate gear. One switch is arranged to actuate the trolley of the cutting device, while the other generates the pulses required to clamp the cutting device relative to the pipe.
[0006] The aforementioned automatic positioning welding and cutting device for metal tubular objects is characterized in that the tube 1 is driven by roller 2 in the forward direction; the trolley 3 of the cutting device is driven by motor 4 and moves on a fixed track parallel to the tube; a measuring disk 5 rotatable about an axis 6 is mounted on the trolley of the cutting device, which is driven to rotate by a friction roller 9 also mounted on the trolley of the cutting device via gear 7 and a detachable coupling device 8, the roller cooperating with the tube 1; therefore, the distance traveled by the tube relative to the cutting device is transmitted to the measuring disk 5.
[0007] The aforementioned automatic positioning welding and cutting device for metal tubular objects is characterized in that the measuring disc 5 is provided with a stop 10 on its circumference. At the start of operation, the stop abuts against an adjustable stop screw 11. The roller 9 measures the distance the tube travels relative to the cutting device and transmits the determined value to the disc 5 via a gear 7, causing the disc 5 to begin rotating clockwise. The measuring disc 55 is also provided with a cam 12 on its circumference. This cam can be adjusted circumferentially to the desired tube length. After the disc rotates a certain angle, the cam drives a switch 13. The closing of the switch activates the trolley of the cutting device, causing it to move at an increasingly faster speed along the tube's direction of travel. As the trolley speed increases, the rotational speed of the disc 5 decreases. When the trolley speed is exactly equal to the tube speed, the disc stops, but the trolley speed continues to increase, becoming slightly higher than the tube speed, thus causing the disc to begin rotating counterclockwise. The cam 12 drives a switch 14, which is equipped with a pawl 15 so that the cam 12 is not activated when it rotates clockwise past the switch.
[0008] The aforementioned automatic positioning welding and cutting device for metal tubular objects is characterized in that, once the switch 14 is closed, the jaws of the cutting device grip the tube, and the speed of the device becomes exactly equal to the speed of the tube, thus the measuring disc 5 stops again. The tube is then cut, as the cutting point is precisely determined relative to the cutting device; at the moment the jaws of the cutting device grip the tube, the roller 9 and gear 7 disengage from the disc via a coupling device 8, which can be driven by compressed air, electricity, or other means; then, the measuring disc 5 is pulled back to its starting position by a spring or similar component, i.e., the stop 10 abuts against the screw 11. Therefore, this return motion occurs while the tube is fixed relative to the cutting device. After the measuring disc reaches its starting position, the roller and gear re-engage, and the tube is locked relative to the cutting device. Thus, once the cutting device returns to its starting position after the cutting operation, the measuring disc is again ready to measure the length of the tube passing through the cutting device. Because the switch 14 is closed and, in turn, applies a pulse to the jaws, it prevents the measuring disc from gripping the tube before it begins to rotate counterclockwise.
[0009] The aforementioned automatic positioning welding and cutting device for metal tubular objects is characterized in that the switch 13 of the cutting device can be arranged to be adjustable relative to the switch 14, so that the cutting device starts earlier relative to the cutting point. An adjustment mechanism 16 with a pointer is provided, which adjusts the starting point of the cutting device so that the device reaches the cutting point immediately after the acceleration period ends.
[0010] This invention has the advantages of fast and stable welding, accurate positioning, and fast cutting speed. Attached Figure Description
[0011] Figure 1 This is a schematic diagram of the structure of the present invention.
[0012] Figure 2 This is a detailed structural diagram of the device of the present invention. Detailed Implementation
[0013] The present invention will be further described below with reference to the accompanying drawings.
[0014] Figures 1-2 In a preferred embodiment of the present invention, an automatic positioning, welding, and segmenting device for metal tubular objects is shown, characterized in that the tube 1 is driven by rollers 2 in the forward direction; the trolley 3 of the cutting device is driven by a motor 4 and moves on a fixed track parallel to the tube; the cutting device itself A is indicated by dashed lines, and the forward direction of the tube is... Figure 2 The arrow in the diagram indicates this. A measuring disc 5, rotatable about axis 6, is mounted on the trolley of the cutting device. This disc is driven to rotate via a friction roller 9, also mounted on the trolley of the cutting device, through a gear 7 and a detachable coupling device 8. This roller cooperates with the tube 1. Therefore, the distance traveled by the tube relative to the cutting device is transmitted to the measuring disc 5.
[0015] The measuring disc 5 has a stop 10 on its circumference, which abuts against an adjustable stop screw 11 (position shown by the dotted line) at the start of operation (according to the direction of tube movement, from left to right in the example shown). The roller 9 measures the distance the tube has traveled relative to the cutting device and transmits this value to the measuring disc 5 via gear 7, causing the disc 5 to begin rotating clockwise. The disc 5 also has a cam 12 on its circumference, which is adjustable circumferentially to the desired tube length. This cam drives a switch 13 after the disc has rotated a certain angle. Closing this switch activates the trolley of the cutting device, causing it to move at increasingly faster speeds along the tube's direction of travel.
[0016] As the trolley speed increases, the rotational speed of disk 5 decreases. When the trolley speed is exactly equal to the tube speed, the disk stops. However, the trolley speed continues to increase, becoming slightly higher than the tube speed, so the disk begins to rotate counterclockwise. As a result, cam 12 drives a switch 14, which is arranged (e.g., equipped with a pawl 15) such that it is not driven when cam 12 rotates clockwise past the switch.
[0017] Once switch 14 is closed, the jaws of the cutting device grip the pipe, and the speed of the device becomes exactly equal to the speed of the pipe, so disc 5 stops again. The pipe is then cut, as the cutting point is precisely determined relative to the cutting device. At the moment the jaws of the cutting device grip the pipe, roller 9 and gear 7 disengage from the disc via coupling device 8, which can be driven by compressed air, electricity, or other means. Disc 5 is then pulled back to its starting position by a spring or similar component, i.e., the position where stop 10 abuts against screw 11. Figure 2 (The position is shown by the dashed line). Therefore, this return motion occurs while the tube is fixed relative to the cutting device. After the measuring disc reaches its starting position, the rollers and gears re-engage, and the tube is locked relative to the cutting device. Thus, once the cutting device returns to its starting position after the cutting operation, the measuring disc is ready again to measure the length of the tube passing through the cutting device. Since switch 14 closes and, in turn, applies a pulse to the jaws, preventing them from gripping the tube before the measuring disc begins to rotate counterclockwise (i.e., before the speed of the cutting device trolley exceeds the speed of the tube), it can be determined that the jaws of the cutting device will never be able to grip the tube before the device reaches the desired speed.
[0018] For example, if switch 14 is arranged to actuate after the disc 5 has rotated an additional angle clockwise—meaning switch 13 has already activated the trolley—then switch 14 may still actuate even after the trolley has started for some reason, because even if the trolley stops, the disc will continue to rotate clockwise, thus actuating switch 13. For the disc to rotate counterclockwise to actually drive switch 14, not only does the trolley need to reach a certain speed, but that speed must also become slightly higher than the pipe speed. Therefore, this arrangement ensures that the shut-off device will not be damaged if activation does not occur.
[0019] The speed difference between the cutting device and the tube can be very small at the moment the jaws grip the tube. This allows the tolerance regarding the length of the cut tube to be kept within very close limits.
[0020] The fact that the cutting device moves at a speed slightly higher than the pipe before the jaws clamp it eliminates the risk of pipe breakage, especially when cutting relatively thin pipes. In fact, if the jaws gripped the pipe when the trolley speed was lower than the pipe speed, it would be the pipe that would accelerate the trolley to its own speed, which could involve considerable force. After cutting, the pipe is released from the jaws of the cutting device, which is then brought back to the beginning of its stroke. The measuring dial 5 then indicates the length of pipe passing through the cutting device in the manner described above.
[0021] Since the cutting device must accelerate to varying speeds on the pipe, the acceleration distance would become uneven if the acceleration force remained constant. Therefore, switch 13 can be arranged to be adjustable relative to switch 14, allowing the cutting device to start earlier than the cutting point, for example, as the pipe speed increases. For this purpose, an adjustment mechanism 16 with a pointer can be provided, moving relative to a scale as shown in the schematic diagram. Thus, the starting point of the cutting device can be adjusted so that the device reaches the cutting point immediately after the acceleration period ends. In this case, there is no need to make the stroke length of the cutting device unnecessarily long.
[0022] The aforementioned automatic positioning welding and cutting device for metal tubular objects is characterized in that the length of the tube to be cut can be further adjusted using a stop screw 11.
[0023] This invention greatly improves the cutting length and welding speed of pipes, and has the characteristics of high yield.
Claims
1. An automatic positioning welding and cutting device for metal tubular objects, comprising a means for coupling a flying shear device to the tube during tube advance, the coupling being achieved via two cam-driven electrical switches, the cams being mounted on a measuring disk that is driven to rotate by the tube via an intermediate gear. One switch is arranged to actuate a trolley of the cutting device, while the other generates pulses required to clamp the cutting device relative to the tube, characterized in that... The tube (1) is driven by roller (2) in the forward direction; the trolley (3) of the cutting device is driven by motor (4) and moves on a fixed track parallel to the tube; a measuring disk (5) that can rotate about an axis (6) is mounted on the trolley of the cutting device, which is driven to rotate by a friction roller (9) also mounted on the trolley of the cutting device via gear (7) and a detachable coupling device (8), which cooperates with the tube (1); thus, the distance traveled by the tube relative to the cutting device is transmitted to the measuring disk (5).
2. The automatic positioning, welding, and cutting device for metal tubular objects according to claim 1, characterized in that, The measuring disc (5) has a stop (10) on its circumference. At the start of operation, the stop abuts against an adjustable stop screw (11). The roller (9) measures the distance the tube travels relative to the cutting device and transmits the value determined therefrom to the measuring disc (5) via a gear (7), causing the measuring disc (5) to start rotating clockwise. The measuring disc (5) also has a cam (12) on its circumference. The cam can be adjusted in the circumferential direction to the required tube length. After the disc rotates a certain angle, the cam drives a switch (13). The closing of the switch activates the trolley of the cutting device. The cam (12) drives a switch (14) equipped with a pawl (15) so that the cam (12) will not be driven when it rotates clockwise past the switch.
3. The automatic positioning, welding, and cutting device for metal tubular objects according to claim 2, characterized in that, Once the switch (14) is closed, the jaws of the cutting device grip the tube, and the speed of the device becomes exactly equal to the speed of the tube, so the measuring disc (5) stops again; at the moment the jaws of the cutting device grip the tube, the roller (9) and gear (7) disengage from the disc via a coupling device (8), which can be driven by compressed air, electricity or other means; then the measuring disc 5 is pulled back to the starting position by a spring or similar component, i.e., the position where the stop 10 abuts against the screw 11; the switch 14 closes and, in turn, applies a pulse to the jaws so that they do not grip the tube before the measuring disc begins to rotate counterclockwise.
4. The automatic positioning, welding, and cutting device for metal tubular objects according to claim 2, characterized in that, The switch (13) of the cutting device can be arranged to be adjustable relative to the switch (14), so that the cutting device starts earlier relative to the cutting point. An adjustment mechanism (16) with a pointer is provided, which adjusts the starting point of the cutting device so that the device reaches the cutting point immediately after the acceleration period ends.