CN113551581B - Direct-reading type electric power large-caliber pipeline inner diameter measuring device - Google Patents
Direct-reading type electric power large-caliber pipeline inner diameter measuring device Download PDFInfo
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- CN113551581B CN113551581B CN202110804700.6A CN202110804700A CN113551581B CN 113551581 B CN113551581 B CN 113551581B CN 202110804700 A CN202110804700 A CN 202110804700A CN 113551581 B CN113551581 B CN 113551581B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/08—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters
- G01B5/12—Measuring arrangements characterised by the use of mechanical techniques for measuring diameters internal diameters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E30/00—Energy generation of nuclear origin
- Y02E30/30—Nuclear fission reactors
Abstract
The direct-reading type electric large-caliber pipeline inner diameter measuring device comprises a fixed chord member, a semi-diameter direct-reading rod, a telescopic chord member, a circle center positioning rod and a chord arc wheel, wherein the fixed chord member is arranged on the fixed chord member; the middle part of the fixed chord member is provided with a vertical through hole, the radius direct-reading rod passes through the vertical through hole, and the telescopic chord member is rotationally connected with one end of the fixed chord member and the lower end of the radius direct-reading rod; the circle center positioning rod is vertically and fixedly arranged in the middle of the telescopic chord; the three chord arc wheels are respectively arranged at two ends of the fixed chord member and the lower end of the radius direct reading rod; the chord arc wheel is wide bottom; a spiral locking pin is arranged on the fixed chord; the inner diameter of the large-diameter pipeline can be directly obtained by only measuring and reading the scale value on the semi-diameter direct-reading rod, and the telescopic chord members can simultaneously extend and retract towards the two ends so that the circle center positioning rod and the radius direct-reading rod accurately cross the circle center of the large-diameter pipeline; the measurement work can be completed by only one person, and the method is simple and convenient.
Description
Technical Field
The invention relates to the technical field of power equipment measuring devices, in particular to a direct-reading type electric large-caliber pipeline inner diameter measuring device.
Background
The metal supervision is a main measure for ensuring the safety of the power equipment, and the metal supervision work is to perform the whole process technical supervision management on the selection, design, manufacture, installation, debugging, trial production, operation, shutdown, maintenance and technical transformation of the equipment, so that problems are found in time, effective supervision measures are adopted, and the measurement of various pipelines is a basic work of the metal supervision. Besides the common small-caliber wire pipelines, the power equipment is provided with a plurality of large-caliber pipelines with large pipe diameters, in particular a plurality of large-caliber tunnel pipelines, so that the wiring construction of a power system is facilitated.
Because the electric large-caliber pipeline is easy to deform, the inner diameter of the pipeline is usually required to be measured and checked in construction and maintenance, traditional detection personnel usually calculate the pipe diameter in a mode of measuring the circumference of the pipeline, and some detection personnel can visually locate the center of the measured section even by personal feeling, and the measuring tape is adopted for direct reading, so that deviation is easy to be caused, and the accuracy of measurement is seriously influenced especially for the large-caliber electric pipeline.
Patent document CN 111735364B discloses an electric large-caliber pipeline inner diameter measuring device, which comprises a telescopic guide rod with scale marks, wherein one end of the telescopic guide rod is provided with a pipeline clamping assembly, the other end of the telescopic guide rod is provided with a guide sliding block, two sides of the telescopic guide rod are respectively provided with a telescopic side rod, one end of the telescopic side rod is rotationally connected with the center of the guide sliding block, and the other end of the telescopic side rod is connected with a side rod fixing piece; the telescopic side rod is clamped and fixed with the pipeline through the side rod fixing piece, the telescopic side rod is driven to rotate by the central rotating shaft along with the extension of the telescopic guide rod, and when the telescopic side rod and the side rod fixing piece form an included angle of 90 degrees, the telescopic side rod is clamped and fixed through the rotating limiting rod and the right-angle limiting plate arranged on the side rod fixing piece, the center of the guide sliding block is the circle center of the pipeline, and the method can measure the electric power large-diameter pipeline.
However, this device still has several drawbacks: 1, three telescopic guide rods are required to be operated simultaneously, so that the structure is complex, and three persons are required to finish the large-diameter pipeline, thereby wasting manpower and material resources; 2 is that the outer clamping plate 51 of the side rod fixing piece is required to be placed on the outer side of the pipeline wall for measurement, which is also the product of a factory for measurement, and cannot be measured for a pipeline buried underground or installed in a tunnel; and 3, particularly, most of the telescopic side rods are cement pipelines, the inner diameter of the telescopic side rods is generally rough, the corners of the inner clamping plates are worn after the telescopic side rods are used for a long time, and the inner clamping plates on the two sides of the telescopic side rods are often uneven in wear, so that the centers of the guide sliding blocks cannot fall on the circle centers of the pipelines even if the telescopic side rods are vertical, and accurate measurement values cannot be obtained.
Disclosure of Invention
The invention aims to solve the technical problem of providing the pipeline inner diameter measuring device with the edge provided with the roller, which only needs to measure the circle center corresponding to the inner cambered surface of the pipeline, so as to avoid abrasion of measuring tools and accurately measure the inner wall of the pipeline by a single person.
In order to solve the technical problems, the technical scheme adopted by the invention is that the direct-reading type electric large-caliber pipeline inner diameter measuring device is characterized by comprising a fixed chord, a semi-diameter direct-reading rod, a telescopic chord, a circle center positioning rod and a chord arc wheel; the middle position of the fixed chord member is provided with a vertical through hole, the radius direct-reading rod passes through the vertical through hole, the radius direct-reading rod can freely slide in the vertical through hole, and the radius direct-reading rod is provided with scale marks; one end of the telescopic chord is movably and rotatably connected with one end of the fixed chord, and the other end of the telescopic chord is movably and rotatably connected with the lower end of the semi-diameter direct reading rod; the center positioning rod is vertically and fixedly arranged in the middle of the telescopic chord member and obliquely upwards passes through a strip hole which is arranged in the middle line position of the fixed chord member in advance, the center positioning rod is not contacted with the fixed chord member when passing through the strip hole, and the center positioning rod is vertically positioned in the middle of the telescopic chord member all the time in the telescopic chord member telescopic process; the chord arc wheel is made of rollers, and three chord arc wheels are arranged and respectively installed at two ends of the fixed chord member and the lower end of the radius direct-reading rod.
The measuring method comprises the following steps: (1) drawing a circle on the inner wall of the large-diameter pipeline to be measured, or drawing a circular arc line at the position to be measured when the condition is insufficient, and ensuring that the circle or the circular arc line is on the same circular plane; (2) placing the three string arc wheels on the same circular plane in the large-diameter pipeline, namely the same circular arc line until the three string arc wheels are contacted with and propped against the inner wall of the large-diameter pipeline; (3) at this time, the circle center positioning rod will cross with the radius direct reading rod, the crossing position is the circle center of the large diameter pipeline at the measured position, the scale number of the radius direct reading rod at the position is read, the radius of the chord arc wheel is added, or the length of the radius is directly counted into the starting point number of the scale mark during manufacturing, and the scale number is directly read during measurement, namely the radius of the large diameter pipeline at the measured position, so the direct reading type electric large diameter pipeline inner diameter measuring device is called.
The telescopic chord comprises a T-shaped tube barrel, a gear shaft, a left toothed bar and a right toothed bar; the T-shaped tube comprises a straight tube and a vertical tube, the vertical tube is vertically and fixedly arranged in the middle of the straight tube, and the vertical tube is used for installing a circle center positioning rod; the straight pipe barrel is a square-hole pipe barrel, gear shaft holes are dug on the side walls of the two opposite sides of the straight pipe barrel, and the gear shaft is fixedly arranged on the straight pipe barrel through the gear shaft holes; the gear is characterized in that racks are arranged on the outer peripheral surface of the gear, a central axis of the gear is dug to form a central shaft hole, bearings are fixedly arranged in the central shaft hole of the gear, two gears and gear shafts are arranged, two pairs of corresponding gear shaft holes are dug, and the two pairs of gear shaft holes are respectively dug to two sides of the middle of the straight pipe barrel and have equal distance from a central point; the left toothed bar consists of a straight bar section, a toothed bar section and a positioning piece which are directly connected, wherein the toothed bar section is fixedly generated on the right side of the straight bar section, and the positioning piece is fixedly generated on the left side of the straight bar section; the rack is arranged on the toothed bar section, the outer side of the toothed bar section is a straight surface and is level with the right side of the straight bar section, the inner side of the toothed bar section is a rack surface, and the rack on the toothed bar section is matched with the rack on the gear; the thickness of the straight rod section is equal to twice the thickness of the toothed rod section, the diameter of the gear and the thickness of the positioning sheet; a blocking tooth bank is arranged at the tail end of the toothed bar section and used for intercepting the gear from falling off; the rear end of the straight rod section is provided with a mounting hole, and a bearing is arranged in the mounting hole; the right toothed bar and the left toothed bar have the same structure.
The attaching method of the telescopic chord comprises the following steps: (1) the tooth bar section on the left tooth bar is clung to the locating piece of the right tooth bar, and the tooth bar section on the right tooth bar is clung to the locating piece of the left tooth bar and then mutually inserted; (2) then inserting the gears into racks between the toothed bar sections on the left toothed bar and the toothed bar sections on the right toothed bar, enabling the contact positions of the two sides of the gears and the toothed bar sections to mutually mesh, inserting the gears into the center point position of the total length of the left toothed bar and the right toothed bar when only one gear exists, and inserting the two gears into the positions which are on the two sides of the center point position of the total length of the left toothed bar and the right toothed bar and have the same distance from the center point when two gears exist; (3) then the straight tube is inserted on the combination body formed by the left toothed bar and the right toothed bar, and the central shaft holes of the two gears are aligned with the gear shaft holes on the side wall of the straight tube; (4) then the gear shaft is inserted into and passes through the gear shaft hole and the central shaft hole, and the bearing in the gear is fixed on the gear shaft; (5) then the gear shaft is fastened and fixed on the straight pipe barrel in a welding or screwing mode, so that the telescopic chord member which can simultaneously stretch towards the two ends at the same distance is manufactured; simultaneously, two gears are installed, and positioning sheets are arranged on the left toothed bar and the right toothed bar, so that the left toothed bar and the right toothed bar can always keep the same straight line when stretching towards two ends by taking the vertical pipe barrel as the center, and the measurement accuracy is finally ensured.
The radius direct-reading rod can be divided into a plurality of sections, and the radius direct-reading rod can be extended and retracted from bottom to top.
The circle center positioning rod can be divided into a plurality of sections and is arranged into a circle center positioning rod which can extend and retract from bottom to top.
The chord arc wheel is a wide-bottom chord arc wheel, namely the wheel bottom of the chord arc wheel is a wide bottom, the width of the chord arc wheel can be 5cm or 50cm, and the width of the wheel bottom is preferably 10cm; the width of the bottom of the chord arc wheel on the middle radius direct-reading rod can be the width of a common roller; the radius of the chord arc wheel can be 0.5cm or 10cm, preferably 1cm; therefore, when in measurement, three string arc wheels can be ensured to be on the same circular plane in the large-diameter pipeline, once deviating from the same plane, the wide wheel bottoms of the string arc wheels can not be simultaneously stuck to the inner wall of the pipeline, and measurement personnel can adjust in time.
The inside of the chord arc wheel is provided with a bearing, both ends of the fixed chord member and the lower end of the radius direct-reading rod are provided with a transverse shaft, and the bearing is arranged on the transverse shaft.
Bearings are mounted at two ends of the telescopic chord, a transverse shaft is mounted at the side end of the fixed chord and the lower end of the radius direct-reading rod, and the bearings are mounted on the transverse shaft.
A spiral locking hole is dug on the fixed chord member at the side edge of the vertical through hole, and a spiral locking pin is arranged on the fixed chord member; when the measurement is determined, the screw locking pin is screwed tightly against the semi-diameter direct-reading rod so as to read the scale.
The upper side of the vertical through hole on the fixed chord member is provided with a vertical positioning pipe, and the radius direct reading rod passes through the vertical positioning pipe so that the radius direct reading rod is always vertical.
Further, the other end of the fixed chord member and the lower end of the radius direct-reading rod are movably and rotatably connected with a telescopic chord member; therefore, when in measurement, the telescopic chords at the two sides of the lower end of the radius direct-reading rod can be telescopic at the same time, so that the semi-diameter direct-reading rod and the fixed chords can be further ensured to be always kept in a vertical state, the three lines of the circle center locating rod and the radius direct-reading rod at the left side and the right side can be intersected at one point to determine whether the circle center measuring point is accurate, and if the three chord arc wheels are positioned on the same circular plane in the large-diameter pipeline, the three lines can be intersected at one point, and if the three chord arc wheels are not positioned on the same circular plane, the three lines cannot necessarily be intersected at one point.
The length of the fixed chord rod can be 50cm or 300cm, preferably 150cm, the width is 3-30cm, preferably 10cm, and the thickness is 0.5-5cm, preferably 3cm; the width of the strip hole arranged on the fixed chord member is 25% -50% of the width of the fixed chord member, the length is 25% -30% of the length of the fixed chord member, and the distance closest to the midpoint is 1% -3% of the length of the fixed chord member.
Compared with the prior art, the invention has the following beneficial effects:
the method has the advantages that the inner diameter of the large-diameter pipeline can be directly obtained only by measuring and reading the scale value on the semi-diameter direct-reading rod, and the method is simple and convenient.
The equipment is simple, convenient to use, only needs one person to accomplish measurement work.
The telescopic chord member is formed by the double gears and the double toothed bars, so that the chord member can simultaneously stretch from the center point to the two ends, and a perpendicular bisector on the telescopic chord member, namely the intersection point of the circle center positioning rod and the semi-diameter direct reading rod, can accurately fall on the circle center of the large-diameter pipeline.
The chord arc wheel is adopted, so that the inner wall of the large-diameter pipeline can roll at will, scale values of a plurality of positions are measured, the measurement is more accurate, and more importantly, the edge of the chord member is not worried about to be worn, and the defect that the chord member is inaccurate due to wear after long-term use is avoided.
The wide-bottom chord arc wheel is adopted, so that the chord member is prevented from deviating from a measured circular plane during measurement, and the inner diameter measurement of the pipeline is more accurate.
The spiral locking pin and the vertical positioning pipe are arranged, so that the semi-diameter direct-reading rod and the fixed chord member can be always kept in a vertical state, and the semi-diameter direct-reading rod is locked when measurement is determined so as to record a measurement result.
Drawings
Fig. 1 is a schematic diagram of the whole structure of the direct-reading type electric large-caliber pipeline inner diameter measuring device.
Fig. 2 is a schematic top view of fig. 1.
Fig. 3 is a schematic diagram showing the overall structure of the direct-reading type electric large-caliber pipeline inner diameter measuring device in the case that only one end of the fixed chord member is provided with the telescopic chord member in embodiment 1.
Fig. 4 is a schematic side perspective view of a telescoping chord employed in the present invention.
Fig. 5 is an exploded view of the telescoping boom of fig. 4.
FIG. 6 is a schematic diagram of the structure of the measuring position in the measuring method of the present invention.
In the figure: 1. fixed chord, 2, radius direct reading bar, 3, telescopic chord, 4, center locating bar, 5, chord arc wheel, 11, vertical through hole, 12, strip hole, 21, scale mark, 31, T-shaped tube, 32, gear, 33, gear shaft, 34, left tooth bar, 35, right tooth bar, 311, straight tube, 312, vertical tube, 313, gear shaft hole, 341, straight bar section, 342, tooth bar section, 343, locating piece, 344, blocking tooth bar, 345, mounting hole, 51, wide bottom chord arc wheel, 13, spiral locking pin, 14.
Detailed Description
The invention is further illustrated by the following examples which are intended to illustrate the invention but not to limit the scope of the invention.
Example 1.
As shown in the figure, a direct-reading type electric large-caliber pipeline inner diameter measuring device is manufactured, and comprises a fixed chord member 1, a radius direct-reading rod 2, a telescopic chord member 3, a circle center positioning rod 4 and a chord arc wheel 5; the fixed chord member 1 is a plate-shaped long straight rod with a certain width, a vertical through hole 11 is arranged in the middle of the fixed chord member 1, the radius direct-reading rod 2 is a long square rod or a long straight round rod, the radius direct-reading rod 2 passes through the vertical through hole 11, the radius direct-reading rod 2 can freely slide in the vertical through hole 11, and scale marks 21 are further arranged on the radius direct-reading rod 11; one end of the telescopic chord member 3 is movably and rotatably connected with one end of the fixed chord member 1, and the other end of the telescopic chord member 3 is movably and rotatably connected with the lower end of the radius direct reading rod 2; the center positioning rod 4 is vertically and fixedly arranged in the middle of the telescopic chord 3, the bottom end of the center positioning rod 4 is fixedly arranged on the telescopic chord 3, the top end of the center positioning rod obliquely upwards passes through a strip hole 12 which is preset on the central line of the fixed chord 1 and deviates from the middle position, the center positioning rod 4 is not contacted with the fixed chord 1 when passing through the strip hole 12, and the center positioning rod 4 is vertically positioned in the middle of the telescopic chord 3 all the time in the telescopic process of the telescopic chord 3; the chord arc wheel 5 is made of rollers, and the chord arc wheel 5 is provided with three chord arc wheels which are respectively arranged at two ends of the fixed chord member 1 and the lower end of the radius direct reading rod 2.
The telescopic chord member 3 comprises a T-shaped tube 31, a gear 32, a gear shaft 33, a left toothed bar 34 and a right toothed bar 35; the T-shaped tube 31 comprises a straight tube 311 and a vertical tube 312, the vertical tube 312 is vertically and fixedly arranged in the middle of the outer side wall of the straight tube 311, and the vertical tube 312 is used for installing a circle center positioning rod 4 so that the circle center positioning rod 4 can be always positioned in the middle of the telescopic chord 3 in a vertical state; the straight pipe barrel 311 is a square pipe barrel, gear shaft holes 313 are dug on the side walls of the two opposite sides of the straight pipe barrel 311, and the gear shaft 33 is fixedly arranged on the straight pipe barrel 311 through the gear shaft holes 313; the gear 32 is provided with racks on the outer peripheral surface, the central axis of the gear 32 is dug to form a central shaft hole, bearings are fixedly arranged in the central shaft hole of the gear 32, two gears 32 and gear shafts 33 are respectively arranged, two pairs of corresponding gear shaft holes 313 are dug, and the two pairs of gear shaft holes 313 are respectively dug to two sides in the middle of the straight pipe barrel 311 and have equal distances from the central point of the straight pipe barrel 311; the left toothed bar 34 is composed of a straight bar section 341, a toothed bar section 342 and a positioning piece 343 which are directly connected, wherein the toothed bar section 342 is fixedly generated on the right side of the straight bar section 341, and the positioning piece 343 is fixedly generated on the left side of the straight bar section 341; the rack bar section 342 is provided with a rack, the outer side of the rack bar section 342 is a flat surface and is level with the right side of the straight bar section 341, the inner side of the rack bar section 342 is a rack surface, and the rack on the rack bar section 342 is matched with the rack on the gear 32; the thickness of the straight bar segment 341 is equal to twice the thickness of the tooth bar segment 342 plus the diameter of the gear 32 plus the thickness of the positioning plate 343; the tail end of the toothed bar section 342 is provided with a blocking tooth bank 344 for intercepting the gear 32 from falling off; the rear end of the straight rod section 341 is provided with a mounting hole 345, and a bearing is arranged in the mounting hole 345; the right toothed bar 35 has exactly the same structure as the left toothed bar 34.
The attachment method of the telescopic chord member 3 is as follows: (1) the tooth bar section 342 on the left tooth bar 34 is clung to the positioning piece 343 of the right tooth bar 35, and the tooth bar section 342 on the right tooth bar 35 is clung to the positioning piece 343 of the left tooth bar 34 and then mutually inserted, preferably to the position shown in fig. 4; (2) then the gear 32 is inserted into the rack between the tooth bar section 342 on the left tooth bar 34 and the tooth bar section 342 on the right tooth bar 35, and the contact positions of the two sides of the gear 32 and the tooth bar section 342 are mutually meshed, when only one gear 32 is arranged, the gear 32 is inserted into the center point position of the total length after the left tooth bar 34 and the right tooth bar 35 are mutually inserted; when there are two gears 32, the two gears 32 are respectively inserted to both sides of the center point position of the total length after the left and right rack bars 34 and 35 are inserted to each other and to positions at equal distances from the center point; (3) then the flat tube 311 is inserted on the combination body formed by the left toothed bar 34 and the right toothed bar 35, and the central shaft holes of the two gears 32 are aligned with the gear shaft holes 313 on the side wall of the flat tube 311; (4) then, the gear shaft 33 is inserted into and passed through the gear shaft hole 313 and the center shaft hole, and the bearing in the gear 32 is fixed to the gear shaft 33; (5) the gear shaft 33 is then fastened to the flat tube 311 by welding or screwing.
Example 2.
As shown in the drawing, on the basis of the embodiment 1, the length of the fixed chord member 1 is 150cm, the width of the fixed chord member 1 is 15cm, the thickness of the fixed chord member 1 is 3cm, two long holes are respectively formed on two sides of the middle point of the fixed chord member 1, the width of each long hole is 5cm, the length of each long hole is 38cm, and the nearest distance from the middle point of the fixed chord member 1 is 2cm.
The other end of the fixed chord member 1 and the lower end of the radius direct-reading rod 2 are also movably and rotatably connected with the telescopic chord member 3.
The radius direct-reading rod 2 is divided into a plurality of sections, such as 5 hollow rod sections in the embodiment, the outer diameter and the inner diameter of each hollow rod section are sequentially reduced, and the upper rod section is inserted into the lower rod section in a stable manner, so that the radius direct-reading rod 2 which can be extended from bottom to top and can also be retracted from top to bottom is arranged.
Also, the center positioning rod 4 is divided into several sections, and the center positioning rod 4 is provided so as to be extendable and retractable from bottom to top.
Setting the arc wheel 5 as a wide-bottom arc wheel 51, namely setting the bottom of the arc wheel 5 as a wide bottom, wherein the width of the bottom of the arc wheel is 10cm; the width of the bottom of the chord arc wheel 5 on the radius direct reading rod 2 positioned in the middle can be the width of a common roller; in this embodiment, the radius of the chord arc wheel 5 is 1cm.
And bearings are arranged in the chord arc wheel 5, transverse shafts are arranged at both ends of the fixed chord member 1 and the lower end of the radius direct reading rod 2, and the bearings are arranged on the transverse shafts.
Bearings are arranged at two ends of the telescopic chord member 3, a transverse shaft is arranged at the side end of the fixed chord member 1 and the lower end of the radius direct reading rod 2, and the bearings are arranged on the transverse shaft.
A screw locking hole is dug on the fixed chord member 1 at the side of the vertical through hole 11, and a screw locking pin 13 is provided.
A vertical positioning pipe 14 is arranged on the upper side of the vertical through hole 11 on the fixed chord member 1, and the radius direct reading rod 2 passes through the vertical positioning pipe 14 so that the radius direct reading rod 2 is always vertical.
Thus, the direct-reading type electric large-caliber pipeline inner diameter measuring device with the telescopic chords 3 arranged at the two ends of the fixed chord member 1 is manufactured.
Example 3.
The direct-reading type electric large-caliber pipeline inner diameter measuring device is adopted for measurement, and the method is carried out according to the following steps.
(1) And drawing a circular arc at the measuring position on the inner wall of the large-diameter pipeline to be measured, and ensuring that the circular arc is on the same circular plane. (2) Placing three string arc wheels 5 on the arc line on the inner wall of the large-diameter pipeline, firstly, enabling the string arc wheels 5 on the left side and the right side of the fixed chord member 1 to contact and prop against the inner wall of the pipeline, enabling the wide bottoms of the string arc wheels to completely contact the inner wall, and then pressing down the string arc wheels 5 at the bottom end of the semi-diameter direct reading rod 2 until the bottoms of the three string arc wheels 5 completely contact and prop against the inner wall of the large-diameter pipeline; (3) at this time, the circle center positioning rod 4 will intersect with the radius direct reading rod 2, and the intersection position is the circle center of the large-diameter pipeline at the measured position, and the scale number of the radius direct reading rod 2 at the measured position is directly read, so as to obtain the radius data of the large-diameter pipeline at the measured position.
Claims (5)
1. The direct-reading type electric large-caliber pipeline inner diameter measuring device is characterized by comprising a fixed chord member, a semi-diameter direct-reading rod, a telescopic chord member, a circle center positioning rod and a chord arc wheel; the middle position of the fixed chord member is provided with a vertical through hole, the radius direct-reading rod passes through the vertical through hole, the radius direct-reading rod can freely slide in the vertical through hole, and the radius direct-reading rod is provided with scale marks; the two telescopic chords are arranged, one end of one telescopic chord is movably and rotatably connected with one end of the fixed chord, the other end of the telescopic chord is movably and rotatably connected with the lower end of the semi-diameter direct reading rod, one end of the other telescopic chord is movably and rotatably connected with the other end of the fixed chord, and the other end of the telescopic chord is also movably and rotatably connected with the lower end of the semi-diameter direct reading rod; the two circle center positioning rods are vertically and fixedly arranged in the middle of the two telescopic chords respectively, and are vertically positioned in the middle of the telescopic chords all the time in the telescopic process of the telescopic chords; the chord arc wheels are made of rollers and are respectively arranged at two ends of the fixed chord member and the lower end of the radius direct-reading rod;
the measuring method comprises the following steps: placing the three string arc wheels on the same circular plane in the large-caliber pipeline until the three string arc wheels are contacted with and propped against the inner wall of the large-caliber pipeline, wherein at the moment, the two circle center positioning rods are intersected with the radius direct-reading rod, the intersection position is the circle center of the large-caliber pipeline at the measured position, and the scale number of the radius direct-reading rod at the intersection position is directly read, namely the radius of the large-caliber pipeline at the measured position;
the telescopic chord comprises a T-shaped tube barrel, a gear shaft, a left toothed bar and a right toothed bar; the T-shaped tube comprises a straight tube and a vertical tube, and the vertical tube is vertically and fixedly arranged in the middle of the straight tube; the straight pipe barrel is a square-hole pipe barrel, gear shaft holes are dug on the side walls of the two opposite sides of the straight pipe barrel, and the gear shaft is fixedly arranged on the straight pipe barrel through the gear shaft holes; the central axis of the gear is dug to be a central shaft hole, bearings are fixedly arranged in the central shaft hole of the gear, two gears and gear shafts are arranged, two pairs of corresponding gear shaft holes are dug, and the two pairs of gear shaft holes are respectively dug to two sides of the middle of the straight pipe barrel and have equal distances from the central point; the left toothed bar consists of a straight bar section, a toothed bar section and a positioning piece which are directly connected, wherein the toothed bar section is fixedly generated on the right side of the straight bar section, and the positioning piece is fixedly generated on the left side of the straight bar section; the outer side of the toothed bar section is a straight surface and is level with the right side of the straight bar section, the inner side of the toothed bar section is a rack surface, and racks on the toothed bar section are matched with racks on the gear; the thickness of the straight rod section is equal to twice the thickness of the toothed rod section, the diameter of the gear and the thickness of the positioning sheet; a blocking tooth bank is arranged at the tail end of the toothed bar section; the rear end of the straight rod section is provided with a mounting hole; the right toothed bar and the left toothed bar have the same structure;
the attaching method of the telescopic chord comprises the following steps: (1) the tooth bar section on the left tooth bar is clung to the locating piece of the right tooth bar, and the tooth bar section on the right tooth bar is clung to the locating piece of the left tooth bar and then mutually inserted; (2) inserting gears into racks between the toothed bar sections on the left toothed bar and the toothed bar sections on the right toothed bar, enabling contact positions between two sides of the gears and the toothed bar sections to mutually mesh, and respectively inserting the two gears into positions which are two sides of the center point position of the total length of the left toothed bar and the right toothed bar and have equal distances from the center point; (3) the straight pipe barrel is inserted on a combination body formed by a left toothed bar and a right toothed bar, and the central shaft holes of the two gears are aligned with the gear shaft holes on the side wall of the straight pipe barrel; (4) then the gear shaft is inserted into and passes through the gear shaft hole and the central shaft hole, and the bearing in the gear is fixed on the gear shaft; (5) fastening and fixing the gear shaft on the straight pipe barrel;
the vertical pipe barrel is used for installing a circle center positioning rod so that the circle center positioning rod can be positioned in the middle of the telescopic chord member in a vertical state all the time;
the inside of the chord arc wheel is provided with a bearing, the mounting holes at the two ends of the telescopic chord member are provided with bearings, the two ends of the fixed chord member and the lower end of the radius direct reading rod are provided with transverse shafts, and the bearings are arranged on the transverse shafts.
2. The direct-reading type electric large-caliber pipeline inner diameter measuring device according to claim 1, wherein the semi-diameter direct-reading rod and the circle center positioning rod are divided into a plurality of sections and are arranged into a radius direct-reading rod or a circle center positioning rod which extends and retracts from bottom to top.
3. The direct-reading type electric large-caliber pipeline inner diameter measuring device according to claim 2, wherein the string arc wheel is a wide-bottom string arc wheel, namely the wheel bottom of the string arc wheel is a wide bottom.
4. The direct-reading type electric large-caliber pipeline inner diameter measuring device according to claim 3, wherein a spiral locking hole is dug on a fixed chord member at the side edge of the vertical through hole, and is provided with a spiral locking pin.
5. The direct-reading type electric large-caliber pipeline inner diameter measuring device according to claim 4, wherein a vertical positioning pipe is arranged on the upper side of the vertical through hole on the fixed chord member, and the radius direct-reading rod passes through the vertical positioning pipe.
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