Internal-charging pipe bending method

Abstract

The invention discloses a method for internally charging and bending a pipe. The method comprises the following steps: 1) firstly, closing one end of a metal pipe to be bent; pressurizing the interior of the metal pipe; the other end of the metal tube is sealed after pressurization; (2) a movable support of the auxiliary tool for internally charging the bent pipe is located at the horizontal position, and the movable support is connected with a handle; (3) one end of the metal pipe penetrates through a circular hole formed by the rolling wheel I and the rolling wheel II from top to bottom, and the lower end of the metal pipe is fixed; (4) the handle is rotated, so that the movable support rotates upwards to bend the metal pipe by a designed angle; (5) after bending is completed, the bent metal pipe is taken down from the internal charging pipe bending auxiliary tool; the two ends of the metal pipe are opened, and oil or water or high-pressure gas or sand in the pipe is discharged. The metal pipe bending device is easy to operate, during operation, firstly, the pressure inside the pipe is higher than the pressure outside the pipe, due to the fact that the arc-shaped grooves are formed in the side faces of the rolling wheel I and the rolling wheel II, the metal pipe is arranged between the rolling wheel I and the rolling wheel II to be bent, and the flattening phenomenon can be effectively prevented in the bending process.

Description

Technical Field

[0001] The invention relates to an internal pressure-filled pipe bending method. Background Art

[0002] In the bending of metal pipe parts, a large part of the work is to replace and repair the broken oil pipes of the equipment and measure the dimensions on site before bending the pipes. It is difficult to carry the special equipment for bending pipes. In actual work, simple tools are used for bending pipes without protective process measures, resulting in uneven pipe diameters or even flat pipes after bending. Figure 1-2 Some even have non-circular cross-sections after bending, such as Figure 3-4 As shown, this causes the flow of liquid in the pipe to be blocked and not smooth, seriously affecting the normal use of the maintenance equipment. Summary of the invention

[0003] In order to solve the above technical problems, the present invention provides an internal pressure pipe bending method which is easy to operate and can prevent the metal pipe from being flattened during bending.

[0004] The technical solution adopted by the present invention is: an internal pressure pipe bending method, which is implemented by an internal pressure pipe bending auxiliary tool, and the internal pressure pipe bending auxiliary tool includes a fixed bracket and a movable bracket; a roller I is installed on the fixed bracket, one end of the movable bracket is hinged to the fixed bracket, and the center of the hinged pair of the movable bracket and the fixed bracket is the center of the circle of the roller I; a roller II is installed on the movable bracket; the roller I and the roller II can pivot, the roller I and the roller II are located in the same plane, and the sides of the roller I and the roller II are respectively provided with grooves with arc-shaped cross-sections; The steps include: 1) First, seal one end of the metal tube to be bent; then connect the other end to an oil pressure pump, water pressure pump or air pressure pump to fill the metal tube with oil, water or high-pressure gas to pressurize it; or fill the metal tube with sand to pressurize it; after pressurization, seal the other end of the metal tube; 2) Make the movable bracket of the internal pressure bending auxiliary tool in a horizontal position and connect the movable bracket to the handle; 3) Pass one end of the metal tube from top to bottom through the circular hole formed by rollers I and II, and fix the lower end of the metal tube; 4) Turn the handle to make the movable bracket rotate upward to the designed bending angle of the metal tube; 5) After bending, remove the bent metal pipe from the internal pressure bending tool; open both ends of the metal pipe and release the oil, water, high-pressure gas or sand in the pipe.

[0005] Furthermore, the radius of the arc-shaped grooves in the cross-sections of rollers I and II is the same as the outer diameter of the metal tube.

[0006] Furthermore, the radius of the roller 1 is equal to the radius of the center line of the metal tube after bending.

[0007] Furthermore, the movable bracket includes a hinged portion and an operating handle connecting portion; the hinged portion is provided with a groove, the front end of the groove is hinged to the fixed bracket, and the fixed bracket and roller I are located in the groove; a roller II is installed in the middle of the hinged portion, and roller II is located in the groove.

[0008] Furthermore, a positioning wheel is provided on the fixed bracket; a groove with an arc-shaped cross-section is provided on the side of the positioning wheel.

[0009] Compared with the prior art, the present invention has the following beneficial effects: The present invention is easy to operate. When operating, firstly, the pressure inside the tube is made higher than the pressure outside the tube. Since arc grooves are arranged on the sides of rollers I and II, the metal tube is placed between rollers I and II for bending, which can effectively prevent flattening during the bending process and ensure product quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a diagram of the structure of a metal tube when the metal tube is bent and flattened.

[0011] Figure 2 yes Figure 1 Middle AA section view.

[0012] Figure 3 This is a diagram of the structure of a metal tube with an elliptical cross section produced when the metal tube is bent.

[0013] Figure 4 yes Figure 3 Middle BB section view.

[0014] Figure 5 It is a structural diagram of the internal pressure-filled pipe bending auxiliary tool used in the present invention.

[0015] Figure 6 It is a cross-sectional view of the internal pressure-filled pipe bending auxiliary tool of the present invention.

[0016] Figure 7 It is a structural diagram of the movable bracket of the internal pressure-filled pipe bending auxiliary tool of the present invention.

[0017] Figure 8 This is a structural diagram when a metal pipe is pressurized by an oil pressure pump, a water pressure pump or an air pressure pump.

[0018] Fig. 9 This is the structural diagram after the metal pipe is filled with sand and pressurized. DETAILED DESCRIPTION

[0019] The present invention will be further described below in conjunction with the accompanying drawings.

[0020] like Figure 5-7As shown, the internal pressure bending aid used in the present invention includes a fixed bracket 1 and a movable bracket 2. A roller I4 is installed on the fixed bracket 1 through a pin I3, and the roller I4 can pivot around the pin I3. One end of the movable bracket 2 is hinged to the fixed bracket 1 through the pin I3 (the center of the hinged pair of the movable bracket 2 and the fixed bracket 1 is the center of the circle of the roller I). A roller II6 is installed on the movable bracket 2 through a pin II5; the roller II6 can pivot around the pin II5, and the roller I4 and the roller II6 are located in the same plane, and the sides of the rollers I4 and II6 are respectively provided with grooves with arc sections. The radius of the arc grooves of the cross sections of the rollers I4 and II6 are the same as the outer diameter of the metal tube 7. The radius of the roller I4 is equal to the radius of the center line of the metal tube after bending. A positioning wheel 7 is provided on the fixed bracket 1; the side of the positioning wheel 7 is provided with a groove with an arc section.

[0021] like Figure 7 As shown, the movable bracket 2 includes a hinged portion 21 and an operating handle connecting portion 22; the hinged portion 21 is provided with a groove 23, the front end of the groove 23 is hinged to the fixed bracket 1, and the fixed bracket 1 and the roller I4 are located in the groove 23. A roller II6 is installed in the middle of the hinged portion 21, and the roller II6 is located in the groove.

[0022] The present invention comprises the following steps: 1) First, seal one end of the metal tube 7 to be bent; then connect the other end to an oil pressure pump, a water pressure pump or an air pressure pump to fill the metal tube with oil, water or high-pressure gas to pressurize it; or fill the metal tube with sand to pressurize it; after pressurization, seal the other end of the metal tube; Figure 8-9 shown.

[0023] 2) Make the movable bracket of the internal pressure bending auxiliary tool in a horizontal position and connect the movable bracket to the handle; 3) Pass one end of the metal tube from top to bottom through the circular hole formed by rollers I4 and II6, and fix the lower end of the metal tube 7; 4) Turn the handle to make the movable bracket 2 rotate upward to bend the metal tube 7 to the designed angle; 5) After the bending is completed, the bent metal tube 7 is removed from the internal pressure bending auxiliary device; both ends of the metal tube are opened to release the oil, water, high-pressure gas or sand in the tube.

Claims

1. An internal pressure pipe bending method, which is implemented by an internal pressure pipe bending auxiliary tool, the internal pressure pipe bending auxiliary tool comprising a fixed bracket and a movable bracket; a roller I is installed on the fixed bracket, one end of the movable bracket is hinged to the fixed bracket, and the center of the hinged pair of the movable bracket and the fixed bracket is the center of the circle of the roller I; a roller II is installed on the movable bracket; the rollers I and II can pivot, the rollers I and II are located in the same plane, and the sides of the rollers I and II are respectively provided with grooves with arc-shaped cross-sections; The steps include: 1) First, seal one end of the metal tube to be bent; then connect the other end to an oil pressure pump, water pressure pump or air pressure pump to fill the metal tube with oil, water or high-pressure gas to pressurize it; or fill the metal tube with sand to pressurize it; after pressurization, seal the other end of the metal tube; 2) Make the movable bracket of the internal pressure bending auxiliary tool in a horizontal position and connect the movable bracket to the handle; 3) Pass one end of the metal tube from top to bottom through the circular hole formed by rollers I and II, and fix the lower end of the metal tube; 4) Turn the handle to make the movable bracket rotate upward to the designed bending angle of the metal tube; 5) After bending, remove the bent metal pipe from the internal pressure bending tool; open both ends of the metal pipe and release the oil, water, high-pressure gas or sand in the pipe.

2. The internal pressure pipe bending method according to claim 1 is characterized in that: The radius of the arc-shaped grooves in the cross sections of rollers I and II is the same as the outer diameter of the metal tube.

3. The internal pressure pipe bending method according to claim 1, characterized in that: The radius of the roller 1 is equal to the radius of the center line of the metal tube after bending.

4. The internal pressure pipe bending method according to claim 1, characterized in that: The movable bracket includes a hinged portion and an operating handle connecting portion; the hinged portion is provided with a groove, the front end of the groove is hinged to the fixed bracket, and the fixed bracket and roller I are located in the groove; a roller II is installed in the middle of the hinged portion, and roller II is located in the groove.

5. The internal pressure pipe bending method according to claim 1, characterized in that: A positioning wheel is arranged on the fixed bracket; a groove with an arc-shaped cross section is arranged on the side surface of the positioning wheel.

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