Automatic Steel Pipe Cutting Machine

Abstract

An automatic steel pipe cutting machine, comprising a machine frame, a motor with an adjustable front and rear position is arranged at the rear of the machine frame, a driving wheel is installed on the output shaft of the motor, driven wheels are respectively installed on the left and right sides of the driving wheel at the front of the machine frame. During cutting, the driving wheel and the driven wheels run along an annular track arranged on the steel pipe. A lifting frame capable of moving up and down is installed at the front of the machine frame, a universal fixture is installed at the front of the lifting frame, a supporting wheel is installed below the universal fixture, and a locking mechanism for always supporting the supporting wheel on the pipe wall of the steel pipe is installed between the lifting frame and the machine frame. Its cutting operation is stable, the cut ends of the steel pipes can be made flush, indirectly improving the subsequent welding quality of the steel pipes and avoiding water leakage at the welded joints.

Description

Technical Field

[0001] The present invention relates to steel pipe cutting equipment, and particularly to an automatic steel pipe cutting machine. Background Art

[0002] In pipeline construction, when there are bend points or crossings in steel pipes, cutting is required at the bend points or crossings of the steel pipes. The traditional steel pipe cutting method is as follows: First, draw a reference line around the bend point or crossing of the steel pipe, and then manually cut the steel pipe at the corresponding reference line using a flame cutting gun. Limited by the proficiency of the cutting worker, the flame cutting gun is prone to shaking, resulting in an uneven pipe orifice of the cut steel pipe, poor subsequent welding quality of the steel pipe, and leakage at the welded joint. Summary of the Invention

[0003] The present invention is to solve the above technical problems, and provides an automatic steel pipe cutting machine, whose cutting operation is stable, can make the pipe orifice of the cut steel pipe flat, indirectly improve the subsequent welding quality of the steel pipe, and avoid water leakage at the welded joint.

[0004] The technical solution of the present invention is as follows:

[0005] An automatic steel pipe cutting machine includes a frame. The special feature is that: a motor with adjustable front and rear position is arranged at the rear of the frame, a driving wheel is installed on the output shaft of the motor, driven wheels are respectively installed on the left and right sides of the driving wheel at the front of the frame. During cutting, the driving wheel and the driven wheels run along an annular track arranged on the steel pipe. A lifting frame that can move up and down is installed at the front of the frame, a universal fixture is installed at the front of the lifting frame, a supporting wheel is installed under the universal fixture, and a locking mechanism that makes the supporting wheel always support on the steel pipe wall is installed between the lifting frame and the frame.

[0006] Further, a swing arm that can rotate back and forth is hinged at the rear of the frame, a spring pull rod is connected between the free end of the swing arm and the frame, and the motor is arranged on the swing arm. The spring pull rod makes the driving wheel and the driven wheels automatically clamp and fix the annular track.

[0007] Further, a lever that can rotate back and forth is hinged at the free end of the swing arm. There is a side opening at the hinged end of the lever. The rear end of the spring pull rod is inserted into the side opening and hinged with the lever. When the lever rotates to the rear end face of the swing arm, the spring pull rod pulls the motor on the swing arm towards the frame side, and the driving wheel and the driven wheels will clamp the annular track. When the lever rotates to one side of the swing arm, the spring pull rod is in a relaxed state, and the driving wheel and the driven wheels are loosened from the annular track.

[0008] Further, the driven wheel is rotatably connected to the frame through a support leg, and a locking mechanism for fixing the support leg is installed between the support leg and the frame to enable the driven wheel to run smoothly along the annular track.

[0009] Further, the locking mechanism is composed of an arc-shaped guiding hole provided on the frame with the rotation center of the support leg as the center of the circle, and a screw rod that passes through the arc-shaped guiding hole from back to front and is installed on the support leg through threads.

[0010] Further, the locking mechanism is a tension spring connected between the lifting frame and the bottom of the frame.

[0011] Further, a support rod extending forward is installed on the lifting frame, and the universal fixture is installed on the support rod.

[0012] Further, annular clamping grooves are provided on the outer circumferential surfaces of the driving wheel and the driven wheel, so that the driving wheel and the driven wheel are clamped on the track.

[0013] The beneficial effects of the present invention are as follows:

[0014] During the cutting operation, an annular track is sleeved on the steel pipe, the driving wheel and the driven wheel are clamped on the front and rear end faces of the annular track, the driving wheel is driven by the motor to drive the frame to travel along the annular track and the circumferential direction of the steel pipe. Under the action of the locking mechanism installed between the lifting frame and the frame, the supporting wheel installed under the universal fixture always abuts against the pipe wall of the steel pipe, so that the height of the flame cutting nozzle installed on the universal fixture is kept constant with the pipe wall of the steel pipe, and the height and inclination angle of the flame cutting nozzle are adjusted through the universal fixture. The cutting operation is stable, the cut pipe orifice is flat, indirectly improving the subsequent welding quality of the steel pipe and avoiding leakage at the welding joint. Description of the Drawings

[0015] Figure 1 is the structural schematic diagram I of the present invention;

[0016] Figure 2 is the structural schematic diagram II of the present invention;

[0017] Figure 3 is the usage state diagram of the present invention.

[0018] In the figure: 1-frame, 2-swing arm, 3-lever, 4-side opening, 5-spring pull rod, 6-motor, 7-driving wheel, 8-support leg, 9-driven wheel, 10-arc-shaped guiding hole, 11-screw rod, 12-annular clamping groove, 13-lifting frame, 14-tension spring, 15-support rod, 16-universal fixture, 17-supporting wheel. Detailed Embodiments

[0019] As shown in the figure, an automatic steel pipe cutting machine includes a frame 1. A swing arm 2 that rotates back and forth is hinged to the rear of the frame 1. A lever 3 that rotates back and forth is hinged to the free end of the swing arm 2. A side opening 4 is provided at the hinged end of the lever 3. A spring pull rod 5 is connected between the lever 3 and the frame 1 within the side opening 4. A motor 6 with an output shaft vertically downward is installed on the swing arm 2. A driving wheel 7 is installed on the output shaft of the motor 6. Legs 8 that rotate up and down are respectively hinged to the left and right sides of the driving wheel 7 at the front of the frame 1. A driven wheel 9 is installed on the legs 8. A locking mechanism is installed between the legs 8 and the frame 1. The locking mechanism is composed of an arc-shaped guiding hole 10 provided on the frame 1 with the hinge point of the legs 8 as the center of the circle, and a screw rod 11 that passes through the arc-shaped guiding hole 10 from the rear to the front and is installed on the legs 8 through threads. An annular clamping groove 12 is provided on the outer circumferential surfaces of the driving wheel 7 and the driven wheel 9. A lifting frame 13 that slides up and down is installed at the front of the frame 1. A tension spring 14 is connected between the lifting frame 13 and the lower part of the frame 1. A support rod 15 that extends forward is installed on the lifting frame 13. A universal fixture 16 is installed on the support rod 15. A support wheel 17 is installed below the universal fixture 16.

[0020] During the cutting operation, first, an annular track coaxial with the steel pipe is sleeved on the steel pipe. Then, the driving wheel 7 and the driven wheel 9 are clamped at the front and rear ends of the annular track through the annular clamping groove 12. At this time, under the pulling force of the tension spring 14, the support wheel 17 abuts against the pipe wall of the steel pipe. Then, a flame cutting nozzle connected to a combustible gas source through a pipeline is installed on the universal fixture 16. The height and inclination angle of the flame cutting nozzle are adjusted through the universal fixture 16, and the combustible gas ejected from the flame cutting nozzle is ignited to generate a flame. Finally, the motor 6 is started to make the frame 1 travel circumferentially on the annular track, so that the flame ejected from the flame cutting nozzle cuts the steel pipe circumferentially.

[0021] The above are only specific embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An automatic steel pipe cutting machine, comprising a frame, characterized in that: A swing arm that rotates back and forth is hinged at the rear of the frame. A lever that rotates back and forth is hinged at the free end of the swing arm. A side opening is provided at the hinged end of the lever. A spring pull rod is connected between the lever located within the side opening and the frame. The rear end of the spring pull rod is inserted into the side opening and hinged to the lever. A motor is installed on the swing arm, and a driving wheel is installed on the output shaft of the motor. Driven wheels are respectively installed on the left and right sides of the driving wheel at the front of the frame. During cutting, the driving wheel and the driven wheels travel along an annular track provided on the steel pipe. A lifting frame that can move up and down is installed at the front of the frame. A universal fixture is installed at the front of the lifting frame. Support wheels are installed below the universal fixture. A locking mechanism that enables the support wheels to always support on the pipe wall of the steel pipe is installed between the lifting frame and the frame. The locking mechanism is a tension spring connected between the lifting frame and the bottom of the frame.

2. The automatic steel pipe cutting machine according to claim 1, wherein: The driven wheel is rotatably connected to the frame through a support leg, and a locking mechanism for fixing the support leg is installed between the support leg and the frame.

3. The automatic steel pipe cutting machine according to claim 2, characterized in that: The locking mechanism is composed of an arc-shaped guide hole provided on the frame with the rotation center of the support leg as the center of the circle, and a screw rod that passes through the arc-shaped guide hole from the rear to the front and is installed on the support leg through threads.

4. The automatic steel pipe cutting machine according to claim 1, wherein: A support rod that extends forward is installed on the lifting frame, and the universal fixture is installed on the support rod.

5. The automatic steel pipe cutting machine according to claim 1, characterized in that: Annular grooves are provided on the outer circumferential surfaces of the driving wheel and the driven wheels.

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