Concentric marking tool for perforated arc plate

Abstract

The utility model relates to the technical field of petroleum and natural gas pipeline maintenance and first-aid repair operation tools, in particular to a perforated arc plate concentric marking tool which comprises a perforated arc plate, an expansion base, a linear shaft, a sliding block, a scale rod, a marking rod and a slate pencil clamp, the perforated arc plate is arranged on the outer side of the expansion base, and the expansion base is located on the inner side of a center hole of the perforated arc plate. A linear shaft is arranged above the expansion base and perpendicularly fixed to the expansion base, the axis of the linear shaft coincides with the axis of a center hole of the perforated arc plate, the linear shaft is sleeved with the sliding block, the sliding block can slide in the axial direction of the linear shaft and rotate around the linear shaft, a scale rod is arranged on the inner side of the sliding block, and the two ends of the scale rod extend to the outer side of the sliding block. A scribing rod is arranged on one side of the scale rod; according to the utility model, the concentric circle of the overlook projection can be drawn on the curved surface of the arc plate by centering through the tapping of the center drill of the tapper, and the scribing requirements of connecting pipes with different diameters can be met by adjusting the radius of the circle.

Description

Technical Field

[0001] The utility model relates to the technical field of oil and gas pipeline maintenance and repair tools, in particular to a concentric marking tool for an open-hole arc plate. Background Art

[0002] The opening arc plate is the outer wall of the opening pipe removed after the opening operation in the maintenance and repair work of the oil and gas pipeline. Only after the arc plate is removed can other operations such as sealing be carried out; after the pipeline maintenance operation, in order to ensure the integrity of the inner wall of the pipeline and avoid jamming in the ball cleaning operation, the arc plate needs to be returned to the original position of the opening; in order to return the arc plate to the opening position, it is necessary to weld the arc plate to the pipe at the lower end of the tee plug and send the plug and arc plate to the corresponding position together through the lower plugging operation.

[0003] Because the gap between the arc plate and the pipe opening is very small, only the wall thickness of the tube knife, in order to accurately put the arc plate back to its original position, the welding of the arc plate and the tee plugging pipe needs to be accurately positioned; in the absence of a special marking tool, a ruler is usually used to locate the welding position of the arc plate and the pipe; the disadvantage of this method is that the positioning error of the arc surface ruler is large, and repeated measurements at four circumferential positions are required.

[0004] Therefore, in order to facilitate the center positioning and marking of the perforated arc plate, a concentric marking tool for the perforated arc plate is proposed. By relying on the centering of the hole drill of the hole opener, concentric circles of the top view projection can be drawn on the curved surface of the arc plate, and the radius of the circle can be adjusted to meet the marking needs of pipes with different diameters. This equipment can quickly locate, is simple and convenient to operate, is compact, has higher positioning accuracy and high adaptability, and can meet the welding positioning needs of arc plates of all pipe diameters from 219mm to 1016mm. Utility Model Content

[0005] In order to overcome the problem in daily use of traditional pipe opening tools, the gap between the arc plate and the pipe opening is very small, only the wall thickness of the cylinder knife, so that the arc plate can be accurately put back into its original position, and the welding between the arc plate and the tee plugging pipe needs to be accurately positioned; in the absence of a special marking tool, a ruler is usually used to locate the welding position of the arc plate and the pipe; there is a problem that the positioning error of the arc surface ruler is large, and repeated measurements at four circumferential positions are required.

[0006] The technical solution of the present utility model is: a concentric marking tool for a perforated arc plate, comprising a perforated arc plate and an expansion base, the expansion base being located on the inner side of the center hole of the perforated arc plate, a linear shaft being arranged above the expansion base, the linear shaft being vertically fixed on the expansion base, and the axis of the linear shaft coincides with the axis of the center hole of the perforated arc plate, a slider being sleeved on the linear shaft and being able to slide axially along the linear shaft and rotate around the linear shaft, a ruler rod being arranged on the inner side of the slider, both ends of the ruler rod extending to the outer side of the slider, a marking rod being arranged on one side of the ruler rod, a slate pencil card being arranged at one end of the marking rod, a marking slate pencil being arranged on the inner side of the slate pencil card, and the tip of the marking slate pencil being in contact with the curved surface of the perforated arc plate.

[0007] Preferably, the linear shaft is inserted into the expansion base and locked, the screw is screwed into the expansion base, the upper linear shaft is inserted into the interior of the slider, the slider can slide and rotate along the linear axis, the ruler rod and the marking rod are fixedly connected by screws, the ruler rod is inserted into the slider, the marking pencil is inserted into the center of the connection between the slate clip and the marking rod and locked, the expansion base is inserted into the circular hole of the perforated arc plate and the expansion base is locked with the perforated arc plate by tightening the screw, the marking pencil is installed in the slate pencil clip, the ruler is adjusted according to the size of the marking radius and locked, and the marking pencil is held by hand so that the marking pencil is oriented in the direction of the linear axis. The marking pencil can be easily replaced to realize centering of the hole drilled by the hole opener. By centering, concentric circles of the top projection can be drawn on the curved plate surface. The radius of the circle can be adjusted to meet the marking needs of pipes with different diameters.

[0008] Preferably, the expansion base is a split expansion structure, a locking hole is provided inside the expansion base, and a screw is provided inside the locking hole of the expansion base.

[0009] Preferably, the scale rod is a telescopic rod with a scale, and an adjusting bolt is provided at one end of the scale rod close to the slider for fixing the extended length of the scale rod.

[0010] Preferably, the pencil holder is a detachable clamping structure, and a locking screw for fixing the marking pencil is provided inside the pencil holder.

[0011] Preferably, the ruler rod and the marking rod are fixed by another locking screw, and the tip of the marking stone pencil fits the curved surface of the arc plate.

[0012] Preferably, an optical axis fixing ring is provided between the linear shaft and the expansion base, the optical axis fixing ring is fixedly connected above the expansion base, and the linear shaft is inserted into the optical axis fixing ring and locked by a top screw.

[0013] Preferably, the adjustment range of the scale rod is corresponding to the arc plate welding positioning requirements of pipe diameters from 219 mm to 1016 mm, and the scale accuracy of the scale rod is ±1 mm.

[0014] Beneficial effects of the utility model:

[0015] By locking the expansion base with the center hole of the arc plate, instant centering is achieved, manual centering error is avoided, and rapid positioning is achieved. The sliding and rotating linkage of the linear axis and the slider, combined with the scale adjustment of the ruler rod, ensures that the concentric circle radius error is ≤±1mm, achieving high-precision marking. The ruler rod adjustment range covers pipe diameters from 219mm to 1016mm, meeting a variety of pipe welding requirements. The slate pencil card can quickly replace the marking slate pencil. The tool is compact and light as a whole, suitable for field operations; thus, the hole centering is achieved by relying on the center drill of the hole opener. By this centering, concentric circles can be drawn on the curved surface of the arc plate from a top view, and the circle radius can be adjusted to meet the marking requirements of pipes with different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a schematic diagram of the first three-dimensional structure of the concentric marking tool for perforated arc plates of the present invention;

[0017] Figure 2 Shown is a schematic diagram of the second three-dimensional structure of the concentric marking tool for perforated arc plates of the present invention;

[0018] Figure 3 Shown is a schematic diagram of the first plane structure of the concentric marking tool for perforated arc plates of the present invention;

[0019] Figure 4 Shown is a schematic diagram of the second plane structure of the concentric marking tool for perforated arc plates of the present invention;

[0020] Figure 5 Shown is a schematic diagram of the partial three-dimensional structure of the concentric marking tool for perforated arc plates of the present invention.

[0021] Explanation of the accompanying symbols: 1. Perforated arc plate; 2. Expansion base; 3. Slider; 4. Linear axis; 5. Marking rod; 6. Ruler rod; 7. Optical axis fixing ring; 8. Slate pencil clip; 9. Screw; 10. Marking pencil; 11. Locking screw. DETAILED DESCRIPTION

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0023] See also Figure 1 and Figure 2 The utility model provides an embodiment: a concentric marking tool for a perforated arc plate, comprising a perforated arc plate 1 and an expansion base 2, the expansion base 2 being located on the inner side of the center hole of the perforated arc plate 1, a linear shaft 4 being arranged above the expansion base 2, the linear shaft 4 being vertically fixed to the expansion base 2, and the axis of the linear shaft 4 coincides with the axis of the center hole of the perforated arc plate 1, a slider 3 being sleeved on the linear shaft 4 and being able to slide axially along the linear shaft 4 and rotate around the linear shaft 4, a scale rod 6 being arranged on the inner side of the slider 3, both ends of the scale rod 6 extending to the outer side of the slider 3, a marking rod 5 being arranged on one side of the scale rod 6, a slate pencil card 8 being arranged at one end of the marking rod 5, a replaceable marking slate pencil 10 being arranged on the inner side of the slate pencil card 8, and the tip of the marking slate pencil 10 being in contact with the curved surface of the perforated arc plate 1.

[0024] See also Figure 3 、 Figure 4 and Figure 5 In this embodiment, the expansion base 2 is a split expansion structure. A locking hole is provided inside the expansion base 2. A screw 9 is provided inside the locking hole of the expansion base 2. When in use, the expansion base 2 is radially expanded by screwing the screw 9 into the locking hole to achieve a fixed connection with the center hole of the perforated arc plate 1. The scale rod 6 is a retractable rod with a scale. An adjusting bolt is provided at one end of the scale rod 6 close to the slider 3 for fixing the extended length of the scale rod 6. The marking radius is adjusted by adjusting the extended length of the scale rod 6.

[0025] The slate pencil card 8 is a detachable clamping structure. A locking screw 11 is provided inside the slate pencil card 8 for fixing the marking slate pencil 10. The scale rod 6 and the marking rod 5 are fixed by another locking screw 11. The tip of the marking slate pencil 10 fits the curved surface of the arc plate. An optical axis fixing ring 7 is provided between the linear shaft 4 and the expansion base 2. The optical axis fixing ring 7 is fixedly connected to the top of the expansion base 2. The linear shaft 4 is inserted into the optical axis fixing ring 7 and locked by a top screw. The adjustment range of the scale rod 6 corresponds to the arc plate welding positioning requirements with a tube diameter of 219mm to 1016mm, and its scale accuracy is ±1mm.

[0026] When working, first insert the expansion base 2 into the center hole of the perforated arc plate 1, ensuring that the axis of the expansion base 2 is completely aligned with the center hole of the arc plate; tighten the screws 9 on the expansion base 2, and the split structure of the expansion base 2 is expanded outward by the radial compression of the screws 9, forming a tight fixation with the inner wall of the center hole; then, insert the linear shaft 4 into the optical axis fixing ring 7 above the expansion base 2 and lock it with the top screw to ensure that the linear shaft 4 is strictly aligned with the axis of the center hole, providing a reference axis for subsequent marking;

[0027] According to the pipe diameter requirement of the pipe to be welded, pull the ruler rod 6 to slide it outward along the slider 3 to the corresponding scale position, and lock the extended length of the ruler rod 6 by adjusting the bolt; insert the marking pencil 10 into the pencil holder 8, adjust the extended length of the marking pencil 10 so that the tip of the marking pencil 10 contacts the curved surface of the arc plate, and fix it with the locking screw 11 in the pencil holder 8; at this time, the ruler rod 6 and the marking rod 5 are fixedly connected by the locking screw 11, and the two form a rigid structure to ensure the stability of the radius during the marking process;

[0028] Hold the marking rod 5 and rotate it clockwise or counterclockwise at a constant speed with the linear axis 4 as the axis; during this process, the slider 3 slides axially along the linear axis 4, and at the same time fluctuates up and down with the curvature of the curved surface of the perforated arc plate 1, driving the marking stone pencil 10 to always adhere to the surface of the perforated arc plate 1, and draw a complete circular marking line with the center hole as the center of the circle; after completing the marking, loosen the screw 9 of the expansion base 2 in the opposite direction to release the expansion state of the expansion base 2, and then the entire tool can be removed from the perforated arc plate 1; the marking stone pencil 10 can be replaced at any time, and the various parts of the tool are easy to carry and reuse after being disassembled.

[0029] Through the above steps, the linear shaft 4 is inserted into the expansion base 2 and locked, the screw 9 is screwed into the expansion base 2, the upper linear shaft 4 is inserted into the slider 3, the slider 3 can slide and rotate along the straight line, the ruler rod 6 and the marking rod 5 are fixedly connected with the screw 9, the ruler rod 6 is inserted into the slider 3, the slate pencil card 8 and the marking rod 5 are connected to the center and the marking slate pencil 10 is inserted and locked, the expansion base 2 is inserted into the circular hole of the perforated arc plate 1, and the expansion base 2 is expanded and locked with the perforated arc plate 1 by tightening the screw 9, the marking slate pencil 10 is installed in the slate pencil card 8, the ruler is adjusted according to the size of the marking radius and locked, and the marking rod 5 is held by hand to make the marking slate pencil 10 move. The pen 10 rotates with the linear axis 4 as the axis, and the slider 3 can rise and fall with the curvature of the arc plate to ensure that the marking stone pencil 10 fits the surface of the arc plate for marking. After use, the screw 9 can be loosened to remove the marking tool. The marking stone pencil 10 is positioned by centering the hole at the beginning of the center drill of the hole opener. It can slide up and down along the linear axis 4 and mark in the circumferential direction to draw a projected circle on the surface of the arc plate. The ruler rod 6 can adjust the marking radius. The marking stone pencil 10 can be easily replaced, thereby realizing the centering of the hole opening by the center drill of the hole opener. By this centering, concentric circles of the top projection can be drawn on the curved surface of the arc plate, and the radius of the circle can be adjusted to meet the marking needs of pipes with different diameters. Example 1

[0030] Optionally, in this embodiment, the expansion base 2 is inserted into the center hole of the perforated arc plate 1, and the expansion base 2 is radially expanded and fixed by tightening the screw 9; the linear axis 4 is vertically fixed to the expansion base 2 and locked by the optical axis fixing ring 7 to ensure that the axis and the center hole are strictly coincident; when in use, the expansion base 2 is inserted into the center hole of the arc plate, the screw 9 is tightened to achieve rapid centering, the linear axis 4 is installed and locked, and the slider 3 is pushed to slide along the linear axis 4, driving the marking stone pencil 10 to mark the curved surface of the arc plate;

[0031] Compared with the traditional ruler positioning which requires multiple measurements of four circumferential points and results in higher errors, this embodiment improves the centering accuracy by interference fit between the expansion base 2 and the center hole, shortens the operation time, reduces manual centering errors, achieves rapid centering, and adapts to arc plates of any pipe diameter. Example 2

[0032] Optionally, in this embodiment, the expansion base 2 is a split structure with a locking hole provided inside. After screwing in the screw 9, the split piece is forced to expand radially and lock. When disassembling, the screw 9 is loosened in the opposite direction to shrink. When in use, the screw 9 is tightened to expand the expansion base 2, forming an interference fit with the hole wall. After marking is completed, the screw 9 is loosened in the opposite direction to easily remove the tool.

[0033] Compared with traditional fixing clamps, this embodiment is easy to damage the hole wall and difficult to disassemble; the split design of this embodiment does not cause damage when locking, improves disassembly efficiency, thereby taking into account high locking force and convenient disassembly, and extending the service life of tools and arc plates. Example 3

[0034] Optionally, in this embodiment, the ruler rod 6 is a retractable rod with a scale, the scale range is 219-1016mm, the accuracy is ±1mm, and the length is fixed by an adjustment bolt; the slate pencil holder 8 has a built-in locking screw 11 to clamp the replaceable marking slate pencil 10; when in use, the ruler rod 6 is pulled to the corresponding scale according to the required pipe diameter and locked, which improves the replacement of marking slate pencils 10 of different lengths and adjusts the contact pressure between the pen tip and the curved surface;

[0035] Compared with the traditional radius marking method, which requires manual calculation of the radius and marking one by one, which is time-consuming and error-prone, this embodiment directly positions through a scale ruler, improves marking efficiency and accuracy, realizes rapid radius adjustment, and is suitable for pipe diameters of various specifications. Example 4

[0036] Optionally, in this embodiment, the slider 3 is sleeved on the linear shaft 4 and can slide along the axial direction and rotate around the axis. The marking rod 5 is rigidly connected to the ruler rod 6, driving the marking stylus 10 to fluctuate along the curvature of the arc plate. When in use, the handheld marking rod 5 is rotated around the linear shaft 4 once, and the slider 3 automatically slides along the curved surface of the arc plate, keeping the marking stylus 10 in contact with the curved surface.

[0037] Compared with manual marking, this embodiment requires manual adjustment of the height of the marking pencil 10, which is prone to line breakage or uneven pressure. This embodiment ensures continuous and uniform marking through the adaptive sliding of the slider 3, solves the problem of breakpoints in curved line marking, and improves the reliability of welding positioning.

[0038] The embodiments of the present invention are described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the purpose of the present invention.

Claims

1. A concentric marking tool for a perforated arc plate, comprising a perforated arc plate (1) and an expansion base (2), characterized in that: The expansion base (2) is located inside the center hole of the perforated arc plate (1). A linear shaft (4) is provided above the expansion base (2). The linear shaft (4) is vertically fixed to the expansion base (2), and the axis of the linear shaft (4) coincides with the axis of the center hole of the perforated arc plate (1). The slider (3) is sleeved on the linear shaft (4) and can slide along the axial direction of the linear shaft (4) and rotate around the linear shaft (4). A scale rod (6) is provided inside the slider (3), and both ends of the scale rod (6) extend to the outside of the slider (3). A marking rod (5) is provided on one side of the scale rod (6), and a slate pencil clip (8) is provided at one end of the marking rod (5). A marking slate pencil (10) is provided inside the slate pencil clip (8), and the tip of the marking slate pencil (10) contacts the curved surface of the perforated arc plate (1).

2. The concentric marking tool for perforated arc plates according to claim 1, characterized in that: The expansion base (2) is a split expansion structure, a locking hole is provided inside the expansion base (2), and a screw (9) is provided inside the locking hole of the expansion base (2).

3. The concentric marking tool for perforated arc plates according to claim 1, characterized in that: The scale rod (6) is a telescopic rod with a scale. An end of the scale rod (6) close to the slider (3) is provided with an adjusting bolt for fixing the extended length of the scale rod (6).

4. The concentric marking tool for perforated arc plates according to claim 1, characterized in that: The slate pencil holder (8) is a detachable clamping structure, and a locking screw (11) for fixing the marking slate pencil (10) is provided inside the slate pencil holder (8).

5. The concentric marking tool for perforated arc plates according to claim 4, characterized in that: The ruler rod (6) and the marking rod (5) are fixed via another locking screw (11), and the tip of the marking stone pencil (10) fits the curved surface of the arc plate.

6. The concentric marking tool for perforated arc plates according to claim 1, characterized in that: An optical axis fixing ring (7) is provided between the linear shaft (4) and the expansion base (2), the optical axis fixing ring (7) is fixedly connected above the expansion base (2), and the linear shaft (4) is inserted into the optical axis fixing ring (7) and locked by a top screw.

7. The concentric marking tool for perforated arc plates according to claim 1, characterized in that: The adjustment range of the scale rod (6) corresponds to the arc plate welding positioning requirements of pipe diameters from 219 mm to 1016 mm, and the scale accuracy of the scale rod (6) is ±1 mm.

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