A precise control mechanism for the bending angle of a hydraulic pipe bending machine

Abstract

This invention discloses a precise bending angle control mechanism for a hydraulic pipe bending machine, solving the problems of low bending efficiency, poor bending angle control accuracy, and poor consistency of bending angles among various pipes in the prior art. It designs a horizontal measuring ruler that can be movably hooked onto the upper pressure plate of the hydraulic pipe bending machine. A movable sleeve is movably sleeved on the horizontal measuring ruler. An arc-shaped plate can be replaced and movably inserted into the lower surface of the movable sleeve. The arc of this arc-shaped plate is the same as the arc of the bending die used for bending galvanized steel pipe sleeves. By controlling the position of the movable sleeve on the horizontal measuring ruler, the arc of the galvanized steel pipe sleeve being bent is accurately controlled. Simultaneously, by matching the arc of the galvanized steel pipe sleeve being bent with the arc of the movable inserted arc-shaped plate on the lower surface of the movable sleeve, precise measurement and control of the arc of the galvanized steel pipe sleeve being bent is achieved.

Description

Technical Field

[0001] This invention relates to a hydraulic pipe bending machine, and more particularly to a mechanism for precisely controlling the bending angle of a hydraulic pipe bending machine. Background Technology

[0002] In the workshops and areas of thermal power plants or chemical plants, a large number of cables need to be laid for electrical connections between control boxes and electrical equipment. When the laid cables need to pass through walls or equipment foundations, galvanized steel conduits need to be pre-embedded in these conduits. The cables pass through these conduits, and some cables need to bend at the wall penetration points. Therefore, the pre-embedded galvanized steel conduits must also adapt to these bends and changes in direction to accommodate the cable's movement. Simultaneously, the pre-embedded galvanized steel conduits protect the cables. Therefore, during on-site cable laying, it is often necessary to first bend the pre-embedded galvanized steel conduits to ensure the bending angle conforms to the cable's routing requirements before pre-embedding or laying. Bending the galvanized steel conduits during on-site construction is... The bending process is carried out by a manual hydraulic pipe bending machine. The operator places a section of galvanized steel pipe on the bending operation table of the manual hydraulic pipe bending machine, selects and installs the bending mold, and manually swings the hydraulic cylinder operating rod to push the bending mold onto a section of steel pipe. Two limit columns are set on the other side of the section of steel pipe. Through the combined action of the two limit columns and the pressing bending mold, the section of steel pipe is bent. In the above-mentioned bending process of galvanized steel pipe sleeve, the bending angle of a section of steel pipe is controlled by the operator's visual observation and repeated measurement. The following problems exist: (1) poor bending angle control accuracy; (2) low bending efficiency, and the bending process needs to be repeated many times to complete; (3) when bending pre-embedded pipe fittings in batches, the consistency of the bent steel sleeve is poor. Summary of the Invention

[0003] This invention provides a precise control mechanism for the bending angle of a hydraulic pipe bending machine, which solves the technical problems of low bending efficiency, poor bending angle control accuracy, and poor consistency of bending angle among various pipes in the prior art.

[0004] The present invention solves the above technical problems through the following technical solutions: The overall concept of this invention is as follows: This invention designs a horizontal measuring ruler that can be movably hooked onto the upper pressure plate of a hydraulic pipe bending machine. A movable sleeve is movably sleeved on the horizontal measuring ruler. An arc-shaped plate can be replaced and movably inserted into the lower surface of the movable sleeve. The curvature of the arc-shaped plate is the same as the curvature of the bending die used to bend the galvanized steel pipe sleeve. By controlling the position of the movable sleeve on the horizontal measuring ruler, the curvature of the galvanized steel pipe sleeve being bent can be accurately controlled. At the same time, by matching the curvature of the galvanized steel pipe sleeve being bent with the curvature of the movable arc-shaped plate on the lower surface of the movable sleeve, the curvature of the galvanized steel pipe sleeve being bent can be accurately measured and controlled.

[0005] A precise bending angle control mechanism for a hydraulic pipe bending machine includes a pipe bending operating platform. Two support wheels are mounted on the lower surface of the operating platform. A horizontal hydraulic cylinder is fixedly connected to the left end of the operating platform, and a hydraulic cylinder support wheel is fixedly mounted at the lower end of the horizontal hydraulic cylinder. A hydraulic pressure manual lever is mounted on the left port of the horizontal hydraulic cylinder, and a horizontal output shaft extends from the right port of the horizontal hydraulic cylinder. A front bending limit column and a rear bending limit column are respectively mounted on the right end of the top surface of the pipe bending operating platform. A replaceable arc-shaped die is connected to the horizontal output shaft of the hydraulic cylinder, and the central axis of the arc-shaped die is set at the bending... On the center symmetrical line between the front and rear columns of the bending limit position; on the bending operation platform between the left side of the front and rear columns of the bending limit position, a galvanized steel pipe sleeve to be bent is provided, and an arc-shaped mold is attached to the left arc-shaped outer wall of the galvanized steel pipe sleeve; a trapezoidal upper pressure plate is fastened to the arc-shaped mold and the galvanized steel pipe sleeve, and a measuring ruler with an L-shaped hook is provided on the trapezoidal upper pressure plate. A slider is movably sleeved on the measuring ruler, and a replaceable arc-shaped limit plate is suspended on the lower surface of the slider. The arc of the arc-shaped limit plate, the arc of the top pressure surface of the arc-shaped mold, and the pre-bending arc of the galvanized steel pipe sleeve are the same.

[0006] A scale is provided on the top surface of the measuring ruler, and a threaded through hole is provided on the top of the slider. A set screw is screwed into the threaded through hole. The lower end of the set screw is abutted against the top surface of the measuring ruler, and an operating set screw rotation handle is connected to the upper end of the set screw.

[0007] The trapezoidal upper pressure plate is provided with a through hole at the upper end of the front column and a through hole at the upper end of the rear column for bending and limiting. The trapezoidal upper pressure plate is hinged to the top right side of the horizontal hydraulic cylinder.

[0008] An arc-shaped groove is provided on the arc-shaped surface at the front end of the arc-shaped mold. The arc of the arc-shaped groove is the same as the arc of the pre-bending of the galvanized steel pipe sleeve.

[0009] A method for operating a hydraulic pipe bending machine's precise pipe bending angle control mechanism, characterized by the following steps: Step 1: Select an arc-shaped mold and an arc-shaped limiting plate according to the curvature of the galvanized steel pipe sleeve to ensure that the curvature of the top pressing surface of the selected arc-shaped mold and the curvature of the plate surface of the arc-shaped limiting plate are the same as the curvature of the galvanized steel pipe sleeve pre-bending. The second step is to attach the arc-shaped limiting plate selected in the first step to the bottom surface of the slider, and then move the slider onto the measuring ruler. Third step: Connect the arc-shaped mold selected in the first step to the horizontal output shaft of the hydraulic cylinder; then place the galvanized steel pipe sleeve on the bending operation platform between the left side of the front column of the bending limit and the left side of the rear column of the bending limit. Step 4: Flip the trapezoidal upper pressure plate and press it onto the arc-shaped mold and the galvanized steel pipe sleeve. Make the upper end of the bending limit column pass through the through hole on the trapezoidal upper pressure plate, and make the upper end of the bending limit column pass through the through hole on the trapezoidal upper pressure plate, thereby achieving the limitation of the bending galvanized steel pipe sleeve in the vertical and horizontal directions as well as the front and back directions. Step 5: Movably hook the L-shaped hook onto the left straight edge of the trapezoidal upper pressure plate, and place the measuring ruler on the trapezoidal upper pressure plate in the left-right direction. Calculate the distance between the line connecting the pre-bending column and the post-bending column to the tangent on the rightmost arc surface of the galvanized steel pipe sleeve after bending, based on the pre-bending arc of the galvanized steel pipe sleeve. Determine the positioning positions of the arc-shaped limiting plate and the slider based on the calculated distance. After moving the slider to the positioning position, tighten it with the set screw to fix the relative position between the arc-shaped limiting plate and the slider. Step 6: By operating the hydraulic pressure manual swing lever, the horizontal output shaft of the hydraulic cylinder drives the arc mold to push the galvanized steel pipe sleeve to the right. The galvanized steel pipe sleeve is bent under the limit of the front and rear bending columns. The arc part of the galvanized steel pipe sleeve bent out protrudes to the right between the front and rear bending columns. Step 7: When the bent arc portion of the galvanized steel pipe sleeve contacts the arc-shaped limiting plate, adjust the swing frequency of the hydraulic pressure manual swing lever and simultaneously move the measuring ruler horizontally in the front-back direction. After the bent arc portion of the galvanized steel pipe sleeve gradually comes into contact with the arc surface of the arc-shaped limiting plate, stop swinging the hydraulic pressure manual swing lever. Step 8: Open the pressure relief valve on the horizontal hydraulic cylinder, so that the horizontal output shaft of the hydraulic cylinder drives the arc mold to retract to the left. After flipping up the trapezoidal upper pressure plate, remove the bent galvanized steel pipe sleeve from the bending operation table; thus obtaining a galvanized steel pipe sleeve with a precise bending arc angle.

[0010] In the sixth step, by operating the hydraulic pressure manual lever, the horizontal output shaft of the hydraulic cylinder drives the arc-shaped mold to press the galvanized steel pipe sleeve to the right. The arc-shaped mold presses the galvanized steel pipe sleeve through the arc-shaped groove set on the arc-shaped surface at the front end of the arc-shaped mold, and finally embeds the bent galvanized steel pipe sleeve into the arc-shaped groove.

[0011] This invention transforms the control of the bending arc of the pipe into the limiting control of the chord length and height of the bending arc. By combining a manual hydraulic pipe bending machine with a length measuring ruler and a limiting arc-shaped hanging plate, it achieves user-friendly operation control of the bending process. That is, when the manual hydraulic pipe bending die drives the protruding bending part of the pipe to hit the limiting arc-shaped plate, the required bending angle is achieved. This enables precise control of the bending angle of galvanized steel pipe sleeves, greatly speeds up the efficiency of cable pipe bending operations, and improves the consistency of batch bending of pipes. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 is a structural schematic diagram of the manual hydraulic pipe bending machine of the present invention; Figure 3 This is a schematic diagram of the measuring ruler mechanism for controlling the bending angle of the present invention. Figure 4 This is a diagram showing the relationship between the galvanized steel pipe sleeve 21 of the present invention and the manual hydraulic pipe bending machine before bending. Figure 5 This is a schematic diagram of the structure of the galvanized steel pipe sleeve 21 at the beginning of bending according to the present invention; Figure 6 This is a schematic diagram of the structure of the galvanized steel pipe sleeve 21 when it is bent into place according to the present invention; Figure 7 This is a schematic diagram of the structure of the arc-shaped mold 7 of the present invention; Figure 8 This is a schematic diagram of the structure of the galvanized steel pipe sleeve 21 after bending according to the present invention. Detailed Implementation

[0013] The present invention will now be described in detail with reference to the accompanying drawings: A precise control mechanism for the bending angle of a hydraulic pipe bending machine includes a pipe bending operating platform 1. Two support wheels 2 are mounted on the lower surface of the operating platform 1. A horizontal hydraulic cylinder 3 is fixedly connected to the left end of the hydraulic pipe bending operating platform 1, and a hydraulic cylinder support wheel 4 is fixedly mounted on the lower end of the horizontal hydraulic cylinder 3. The pipe bending operating platform 1 and the horizontal hydraulic cylinder 3 form an integrated hydraulic pipe bending machine, supported by the two support wheels 2 and the hydraulic cylinder support wheel 4, allowing for overall movement. A hydraulic pressure manual swing lever 5 is mounted on the left end of the horizontal hydraulic cylinder 3, and a hydraulic pressure manual swing lever 5 is mounted on the right end of the horizontal hydraulic cylinder 3. A horizontal output shaft 6 of a hydraulic cylinder extends from the port. The operator can hold a hydraulic pressure manual lever 5 and reciprocate to pressurize the horizontal hydraulic cylinder 3, causing the horizontal output shaft 6 to push outward. A front bending limit column 8 and a rear bending limit column 9 are respectively installed on the right end of the top surface of the bending operation platform 1. A replaceable arc-shaped mold 7 is connected to the horizontal output shaft 6 of the hydraulic cylinder. The arc-shaped mold 7 is connected to the end of the horizontal output shaft 6 of the hydraulic cylinder through a bushing in the middle of the left end. The arc-shaped mold 7 is a series of molds with different curvatures, which can be selected according to the required bending angle. The selected arc-shaped mold 7 is then assembled onto the horizontal output shaft 6 of the hydraulic cylinder. The central axis of the arc-shaped mold 7 is set on the center symmetry line between the front bending limit column 8 and the rear bending limit column 9. A galvanized steel pipe sleeve 21 to be bent is set on the bending operation platform 1 between the left side of the front bending limit column 8 and the left side of the rear bending limit column 9. The arc-shaped mold 7 is abutted against the left arc-shaped outer wall of the galvanized steel pipe sleeve 21. A trapezoidal upper pressure plate 10 is fastened to the arc-shaped mold 7 and the galvanized steel pipe sleeve 21. The trapezoidal upper pressure plate 10 is connected by two hinge pins. On the right end of the horizontal hydraulic cylinder 3, a measuring ruler 13 with an L-shaped hook 14 is installed on the trapezoidal upper pressure plate 10. A slider 16 is movably sleeved on the measuring ruler 13. A replaceable arc-shaped limiting plate 17 is suspended on the lower surface of the slider 16. The measuring ruler 13 and the arc-shaped limiting plate 17 form a T-shaped length measuring and limiting mechanism, which is responsible for limiting the curvature of the galvanized steel pipe sleeve 21 during bending deformation. The curvature of the arc-shaped limiting plate 17, the curvature of the top pressing surface of the arc-shaped mold 7, and the pre-bending curvature of the galvanized steel pipe sleeve 21 are the same.

[0014] A scale 15 is provided on the top surface of the measuring ruler 13 to facilitate monitoring of the position of the slider 16. A threaded through hole 18 is provided on the top of the slider 1, and a set screw 19 is screwed into the threaded through hole 18. The lower end of the set screw 19 abuts against the top surface of the measuring ruler 13. An operating set screw rotation handle 20 is connected to the upper end of the set screw 19. When the slider 16 moves to the positioning position, the lower end of the set screw 19 abuts against the top surface of the measuring ruler 13 by operating the set screw rotation handle 20, so that the slider 16 is positioned and not moved. At the same time, the positioning of the arc-shaped limit plate 17 is also realized, which can accurately control the arc deformation of the galvanized steel pipe sleeve 21.

[0015] The trapezoidal upper pressure plate 10 is provided with a through hole 1 at the upper end of the front column and a through hole 12 at the upper end of the rear column. The trapezoidal upper pressure plate 10 is hinged to the top right side of the horizontal hydraulic cylinder 3.

[0016] An arc-shaped groove 22 is provided on the arc-shaped surface at the front end of the arc-shaped mold 7. The arc of the arc-shaped groove 22 is the same as the arc of the pre-bent galvanized steel pipe sleeve 21. The arc-shaped groove 22 serves to grip the arc surface of the galvanized steel pipe sleeve 21.

[0017] A method for operating a hydraulic pipe bending machine's precise pipe bending angle control mechanism, characterized by the following steps: The first step is to select an arc-shaped mold 7 and an arc-shaped limiting plate 17 based on the pre-bending curvature of the galvanized steel pipe sleeve 21, ensuring that the curvature of the top pressing surface of the selected arc-shaped mold 7 and the curvature of the plate surface of the arc-shaped limiting plate 17 are the same as the pre-bending curvature of the galvanized steel pipe sleeve 21. Accurately calculating the pre-bending curvature of the galvanized steel pipe sleeve 21 and selecting the arc-shaped mold 7 and the arc-shaped limiting plate 17 accordingly is the primary condition for precisely controlling the bending curvature. The second step is to attach the arc-shaped limiting plate 17 selected in the first step to the bottom surface of the slider 16, and to movably connect the slider 16 to the measuring ruler 13 to form a T-shaped limiting mechanism frame. Third step: Connect the arc-shaped mold selected in the first step to the horizontal output shaft 6 of the hydraulic cylinder; then place the galvanized steel pipe sleeve 21 on the bending operation platform 1 between the left side of the bending limit column 8 and the left side of the bending limit column 9. Step 4: Flip the trapezoidal upper pressure plate 10 and press it onto the arc mold 7 and the galvanized steel pipe sleeve 21. Make the upper end of the bending limit column 8 pass through the through hole 11 on the trapezoidal upper pressure plate 10, and make the upper end of the bending limit column 9 pass through the through hole 12 on the trapezoidal upper pressure plate 10. This will limit the vertical and horizontal and front-back directions of the galvanized steel pipe sleeve 21 being bent, and complete the preparation for bending the galvanized steel pipe sleeve 21. Step 5: Movably hook the L-shaped hook 14 onto the left straight edge of the trapezoidal upper pressure plate 10, and place the measuring ruler 13 on the trapezoidal upper pressure plate 10 in the left-right direction. Calculate the distance between the line connecting the pre-bent column 8 and the post-bent column 9 of the galvanized steel pipe sleeve 21 and the tangent on the rightmost arc surface of the galvanized steel pipe sleeve 21 after bending, based on the calculated distance. Determine the positioning positions of the arc-shaped limiting plate 17 and the slider 16 based on this calculated distance. After moving the slider 16 to the positioning position, tighten it with the set screw 19 to fix the relative position between the arc-shaped limiting plate 17 and the slider 16. This step converts the pre-bent arc of the galvanized steel pipe sleeve 21 into the height of the chord corresponding to the bending arc, and determines the position of the arc-shaped limiting plate 17 based on this height. Step 6: By operating the hydraulic pressure manual swing lever 5, the horizontal output shaft 6 of the hydraulic cylinder drives the arc mold 7 to push the galvanized steel pipe sleeve 21 to the right. The galvanized steel pipe sleeve 21 is bent under the limit of the bending limit column 8 and the bending limit column 9. The arc part of the galvanized steel pipe sleeve 21 that is bent out protrudes to the right from between the bending limit column 8 and the bending limit column 9. Step 7: When the bent arc portion of the galvanized steel pipe sleeve 21 contacts the arc-shaped limiting plate 17, adjust the swing frequency of the hydraulic pressure manual swing lever 5, and simultaneously move the measuring ruler 13 horizontally in the front-back direction. After the bent arc portion of the galvanized steel pipe sleeve 21 gradually comes into contact with the arc surface of the arc-shaped limiting plate 17, stop swinging the hydraulic pressure manual swing lever 5. Since the bending deformation of the galvanized steel pipe sleeve 21 is a dynamic process, and simultaneously, the measuring ruler 13 is movably hooked onto the ladder... The horizontal position of the upper pressure plate 10 cannot remain stationary. The measuring ruler 13 can be moved back and forth to find the matching position between the arc surface of the trapezoidal upper pressure plate 10 and the bent arc surface of the galvanized steel pipe sleeve 21, so as to achieve the purpose of the measuring mechanism following the measured arc surface. When the bending is completed, the arc groove 22 set on the arc surface of the front end of the arc mold 7, the bent galvanized steel pipe sleeve 21 and the arc surface of the arc limiting plate 17 are tightly fitted together. Step 8: Open the pressure relief valve on the horizontal hydraulic cylinder 3, so that the horizontal output shaft 6 of the hydraulic cylinder drives the arc mold 7 to retract to the left. After flipping up the trapezoidal upper pressure plate 10, take the bent galvanized steel pipe sleeve 21 out from the bending operation table 1; thus obtaining a galvanized steel pipe sleeve with a precise bending arc angle.

[0018] In the sixth step, by operating the hydraulic pressure manual lever 5, the horizontal output shaft 6 of the hydraulic cylinder drives the arc mold 7 to press the galvanized steel pipe sleeve 21 to the right. The arc mold 7 presses the galvanized steel pipe sleeve 21 through the arc groove 22 set on the arc surface at the front end of the arc mold 7, and finally embeds the bent galvanized steel pipe sleeve 21 into the arc groove 22.

Claims

1. A precise control mechanism for the bending angle of a hydraulic pipe bending machine, comprising a pipe bending operating platform (1), two support wheels (2) of the operating platform are provided on the lower bottom surface of the pipe bending operating platform (1), a horizontal hydraulic cylinder (3) is fixedly connected to the left end of the hydraulic pipe bending operating platform (1), and a hydraulic cylinder support wheel (4) is fixedly provided at the lower end of the horizontal hydraulic cylinder (3); a hydraulic pressure manual swing arm (5) is provided on the left port of the horizontal hydraulic cylinder (3), and a horizontal output shaft (6) of the hydraulic cylinder extends from the right port of the horizontal hydraulic cylinder (3); a bending limit front column (8) and a bending limit rear column (9) are respectively provided on the right end of the top surface of the pipe bending operating platform (1), and a replaceable arc mold (7) is connected to the horizontal output shaft (6) of the hydraulic cylinder, the central axis of the arc mold (7) is set on the central symmetrical line between the bending limit front column (8) and the bending limit rear column (9); characterized in that, On the bending operation platform (1) between the left side of the pre-bending column (8) and the left side of the post-bending column (9), a galvanized steel pipe sleeve (21) to be bent is provided. An arc mold (7) is abutted on the left arc-shaped outer wall of the pre-bending galvanized steel pipe sleeve (21). A trapezoidal upper pressure plate (10) is fastened on the arc mold (7) and the galvanized steel pipe sleeve (21). A measuring ruler (13) with an L-shaped hook (14) is provided on the trapezoidal upper pressure plate (10). A slider (16) is movably sleeved on the measuring ruler (13). A replaceable arc-shaped limiting plate (17) is suspended on the lower bottom surface of the slider (16). The arc of the arc-shaped limiting plate (17), the arc of the top pressing surface of the arc mold (7), and the pre-bending arc of the galvanized steel pipe sleeve (21) are the same.

2. The precise control mechanism for the bending angle of a hydraulic pipe bending machine according to claim 1, characterized in that, A scale (15) is provided on the top surface of the measuring ruler (13), and a threaded through hole (18) is provided on the top of the slider (16). A set screw (19) is screwed into the threaded through hole (18), and the lower end of the set screw (19) is abutted on the top surface of the measuring ruler (13). An operating set screw rotating handle (20) is connected to the upper end of the set screw (19).

3. The precise control mechanism for the bending angle of a hydraulic pipe bending machine according to claim 2, characterized in that, The trapezoidal upper pressure plate (10) is provided with a through hole (11) at the upper end of the front column and a through hole (12) at the upper end of the rear column. The trapezoidal upper pressure plate (10) is hinged to the top right side of the horizontal hydraulic cylinder (3).

4. A precise control mechanism for the bending angle of a hydraulic pipe bending machine according to claim 1, 2, or 3, characterized in that, An arc-shaped groove (22) is provided on the arc-shaped surface at the front end of the arc mold (7). The arc of the arc groove (22) is the same as the arc of the pre-bent galvanized steel pipe sleeve (21).

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