CN111366059A - A special detection device for flanges - Google Patents

Abstract

The invention relates to a special device for flange detection. The technical scheme is: a special tool for flange detection, which is characterized in that: the tool includes a movable measuring tool and a detection platform matched with the measuring tool; the measuring tool is a horizontally arranged cross bar, and the lower surface of the cross bar is There are four cylinders symmetrical to the center of the cross bar and located on the same circumference, wherein the length of the connecting line between the centers of the two symmetrically arranged cylinders corresponds to the standard value of the diameter of the center circle of the flange bolt hole, and the centers of the two adjacent cylinders in the circumferential direction The circumferential arc spacing corresponds to the standard value of the spacing between several bolt holes adjacent to the flange; the diameter of each cylinder is suitable for the diameter of the flange bolt holes, and the axis of the cylinder is perpendicular to the lower surface of the cross rod, the cross rod A small hole is opened in the central part of the small hole, and a needle bar can be movably inserted into the small hole. The device should be able to overcome the shortcomings of low traditional detection efficiency and high technical level requirements, and realize rapid detection of batch flanges.

Description

A special detection device for flanges

technical field

The invention relates to a special device for flange detection, which is used to check whether the flange processing size is qualified or not, and is specifically used to realize batch and rapid detection of flanges.

Background technique

Steel forged flanges are a kind of pressure pipeline components, and the manufacturing unit should obtain a manufacturing license before production. The manufacturing quality of the flange depends on the raw material quality of the flange forging blank and the flange machining accuracy. Flanges cannot be used alone, but must be combined with other components. The most important thing in the processing size of the flange is the matching size of the flange and the pipe and the flange and the valve. At present, flange manufacturers basically do not carry out the final inspection of the matching size of the flange, because the traditional vernier calipers, micrometers and steel rulers are used, the inspection efficiency is very low, and the technical level and proficiency of the inspectors are relatively high.

The number of bolt holes of the flange is usually 4, 8, 12, 16, 20, 24, usually an integer multiple of 4. Commonly used nominal diameters are DN50, DN100, DN150, DN200, etc., and commonly used nominal pressures are PN10, PN16, PN25, PN40, etc. The geometric dimensions of the flange are a standard series, and the products are shaped and mass-produced.

The matching dimensions of the flange include the diameter of the center circle of the flange bolt hole, the distance between adjacent bolt holes, the diameter of the bolt hole, the coaxiality between the center circle of the bolt hole and the machined sealing surface, the parallelism between the flange sealing surface and the bolt supporting surface, and the Flange outer diameter, flange inner diameter and flange thickness. For these 8 machining dimension inspections, all flanges should be inspected for these items, that is, the inspection of these items is a must. Flange production is generally mass-produced. The number of flanges with the same nominal pressure and nominal diameter is hundreds or even thousands, and the testing standards require that they be carried out one by one. At present, there is no special rapid detection tool, so designing a special rapid detection tool for flanges is an effective means to improve the detection efficiency and prevent the batch of products from being unqualified.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the above-mentioned background technology, and to provide a special detection device for flanges, which should be able to overcome the shortcomings of low traditional detection efficiency and high technical level requirements, and realize rapid detection of batch flanges.

The technical scheme provided by the present invention is:

A special tool for flange detection is characterized in that: the tool includes a movable measuring tool and a detection platform matched with the measuring tool; the measuring tool is a horizontally arranged cross bar, and the lower surface of the cross bar is evenly distributed with symmetrical Four cylinders at the center of the cross rod and located on the same circumference, the length of the connecting line between the centers of the two cylinders arranged symmetrically corresponds to the standard value of the diameter of the center circle of the flange bolt hole, and the circumferential arc of the centers of the two adjacent cylinders in the circumferential direction The shape spacing corresponds to the standard value of the distance between several bolt holes adjacent to the flange; the diameter of each cylinder is suitable for the diameter of the flange bolt holes, and the axis of the cylinder is perpendicular to the lower surface of the cross rod, and the center of the cross rod is opened There is a small hole, a needle bar can be movably inserted into the small hole, and the needle bar is marked with a scale along the length direction;

The detection platform is a circular flat plate, and a reference point is set in the center of the circular flat plate. Taking the reference point as the center and half of the outer diameter of the DN50, DN100, DN150, and DN200 flanges as the radius, four are arranged at intervals of 90° in the circumferential direction. The outer limit hole used to detect the outer diameter of the flange; the cylindrical limit rod can be movably inserted in the limit hole; at the same time, half of the inner diameter of the DN50, DN100, DN150, DN200 flange is the radius, and the circumference is every 180 °Arrange two inner limit holes for detecting the inner diameter of the flange; a cylindrical limit rod can be movably inserted into the inner limit holes.

Preferably, the cross rod is provided with a plurality of screw holes for fixing the cylinder, so as to meet the detection needs of a plurality of flanges with different diameters.

Preferably, the diameter of the small hole is φ4mm, and the diameter of the needle bar is φ3.8mm.

Preferably, the circular flat plate is a steel flat plate.

Preferably, the diameters of the outer limit holes and the inner limit holes are both φ10mm; the diameters of the cylindrical limiting rods are both φ9.8mm.

Preferably, the cylindrical limiting rod is a steel rod.

Preferably, the measuring tool is provided with a handle.

Preferably, the needle bar is a steel needle.

The working principle of the present invention is:

Because the number of flange bolt holes is an integer multiple of 4, the length of the cross rod is used to determine the diameter deviation of the center circle of the flange bolt hole; if the diameter of the center circle of the flange bolt hole exceeds the standard, the cylinder on the lower surface of the cross rod will not be able to be inserted into the center circle of the flange bolt hole. In the flange bolt hole; use the circumferential arc length of the two adjacent cylinders between the cross rods to locate and detect the distance between the adjacent bolt holes of the flange. If the deviation exceeds the standard, the cylinder on the lower surface of the cross rod will not be able to be inserted. In the flange bolt hole; the diameter of the cylinder on the lower surface of the cross rod can be used to detect whether the diameter of the flange bolt hole exceeds the standard. If the deviation exceeds the standard, the cylinder cannot be inserted into the bolt hole; The needle tip is compared with the reference point of the platform to measure the coaxiality deviation between the center circle of the bolt hole and the machined sealing surface; the distance from the needle tip of the needle bar to the lower surface of the cross bar is used to measure the flange thickness deviation. The contact gap between the lower surface of the cross rod and the flange processing sealing surface is used to measure the parallelism deviation between the flange sealing surface and the bolt supporting surface. The 4 outer limit bars (steel bars) arranged in the upper direction of the inspection platform are used to determine whether the outer diameter of the flange exceeds the standard, and the 2 inner limit bars arranged in the upper direction of the inspection platform are used to determine whether the inner diameter of the flange is large or not. Exceeded.

The beneficial effects of the present invention are:

The special device for flange detection provided by the present invention can detect the detection items of eight kinds of flange machining dimensions at one time, and as long as one item exceeds the standard, it can be found by the detection tool. For batch flange product inspection, it will greatly improve productivity.

Description of drawings

Fig. 1 is the front view structure schematic diagram of the measuring tool in the present invention.

FIG. 2 is a schematic top view of the structure of the measuring tool in the present invention.

FIG. 3 is a schematic diagram of the front view structure of the detection platform in the present invention.

FIG. 4 is a schematic top view of the structure of the detection platform in the present invention.

Fig. 5 is a schematic diagram of the use state of the present invention.

Figure 6 is a schematic front view of the structure of a flange equipped with four bolt holes.

Figure 7 is a schematic bottom view of a flange with four bolt holes.

Fig. 8 is a schematic front view of a flange with eight bolt holes.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings, but the present invention is not limited to the following embodiments.

As shown in Figure 6, Figure 7, and Figure 8, flange 1 has 4 bolt holes and a flange with 8 bolt holes. The flange a surface is the bolt hole support surface, which is used to contact the nut; the b surface is the method The flange sealing surface is used to add a sealing ring when the two flanges are connected.

Figure 1 shows the measuring tool in the special tool for flange detection; the lower surface of the cross rod 6 is on the same plane, the cylinder 5 can be fixed on the lower surface of the cross rod through a threaded fitting structure (preferably a screw hole), and the axis of the cylinder is vertical on the lower surface of the crossbar. The cylinder 5 is used to detect the diameter of the flange bolt holes, so the diameter should be suitable for the size of the flange bolt holes; cylinders of corresponding sizes can be made according to the bolt holes of different flanges to form a series of detection tools. The two cylinders in the length direction of each rod in the cross rod are used to detect the diameter deviation of the center circle of the bolt hole, and the two adjacent cylinders in the circumferential direction are used to detect the deviation of the adjacent spacing of the bolt holes (the circumferential direction of the centers of the two adjacent cylinders in the circumferential direction). The arc spacing corresponds to the standard value of the distance between several bolt holes adjacent to the flange, and the "several" is determined according to the number of bolt holes in the flange; if it is a flange with 8 bolt holes, the number is 3; if it is 12 The number of flanges is 4 bolt holes); the handle 7 is used to facilitate the position adjustment of the special tool for flange detection during detection, and the needle bar 8 (preferably a steel needle) is used to measure the center circle of the bolt hole and the processing sealing surface The deviation of the coaxiality, the distance from the needle tip of the needle bar 8 to the lower surface of the cross bar to determine the flange thickness deviation. The contact gap between the lower surface d of the cross bar 6 and the flange processing sealing surface is used to measure the parallelism deviation between the flange sealing surface and the bolt supporting surface.

Further, a plurality of screw holes for fixing the cylinder can be opened on the cross rod to meet the detection needs of multiple flanges with different diameters (such as DN50, DN100, DN150, DN200 flanges).

Figures 3 and 4 show the detection platform 3; the platform is provided with an outer limit hole 4, and the cylindrical limit rod 2 (preferably a steel rod) can be inserted into the outer limit hole; the flange of the same nominal diameter, the outer The four limit steel rods are used to limit the position of the flange, and at the same time to detect whether the outer diameter of the flange exceeds the standard; there are also two inner limits inserted into the cylindrical limit rods (preferably steel rods) on the platform. Hole 10 is used to detect whether the inner diameter of the flange exceeds the standard. According to the flanges of different nominal diameters, the cylindrical limit rods are placed in different limit holes, and the detection can be carried out. The limit holes are symmetrically arranged in the center of the detection platform. The radial direction next to the limit holes is marked with numbers such as DN50 and DN200, so that it is easy to find the position where the cylindrical limit rod should be inserted.

Figure 5 shows the use state diagram of the special device for flange detection. On the flange detection platform 3, if the flange 1 can be placed between the cylindrical limit rods 2, the outer diameter and inner diameter of the flange are indicated. Meet the requirements; then place the measuring tool on the flange, the cylinder 5 can be completely placed in the 4 bolt holes and the gap with the bolt holes does not exceed the standard, it means that the diameter of the bolt holes meets the requirements, the diameter of the center circle of the bolt holes meets the requirements, and the bolt holes meet the requirements. The hole spacing also meets the requirements; if there is no gap between the lower surface of the cross bar 6 and the flange sealing surface, it means that the parallelism between the flange sealing surface and the bolt supporting surface meets the requirements. If the needle tip of the steel needle 8 is basically consistent with the platform reference point c, it means that the coaxiality between the center circle of the bolt hole and the machined sealing surface meets the requirements. If the scale value on the steel needle 8 matches the design of the flange thickness value, it means that the flange thickness meets the requirements.

For the mold size of the special device for flange detection provided by the present invention, the allowable deviation range of the manufacturing standard should be considered, and the mold size should be set according to the required range of the manufacturing standard deviation.

Claims (8)

1. A special tool for flange detection is characterized in that: the tool comprises a movable measuring tool and a detection platform matched with the measuring tool; the measuring tool is a horizontally arranged cross bar (6), and the lower surface of the cross bar There are four cylinders (5) that are symmetrical to the center of the cross bar and located on the same circumference, wherein the length of the connecting line between the centers of the two cylinders symmetrically arranged corresponds to the standard value of the diameter of the center circle of the flange bolt hole, and the two adjacent circumferential The circumferential arc spacing of the centers of each cylinder corresponds to the standard value of the distance between several bolt holes adjacent to the flange; the diameter of each cylinder is suitable for the diameter of the flange bolt holes, and the axis of the cylinder is perpendicular to the lower part of the cross rod. Surface; a small hole is opened in the center of the cross bar, a needle bar (8) can be movably inserted into the small hole, and the needle bar is marked with a scale along the length direction; The detection platform is a circular flat plate, and a reference point (c) is set in the center of the circular flat plate. Taking the reference point as the center, half of the outer diameter of the DN50, DN100, DN150, and DN200 flanges is the radius, and the circumference is every 90°. Four outer limit holes (4) are arranged for detecting the outer diameter of the flange; cylindrical limit rods (2) can be movably inserted into the limit holes; Half is the radius, and two inner limit holes (10) for detecting the inner diameter of the flange are arranged at intervals of 180° in the circumferential direction; cylindrical limit rods are movably inserted into the inner limit holes. 2 . The special tool for flange detection according to claim 1 , wherein a plurality of screw holes for fixing the cylinder are opened on the cross rod, so as to meet the detection needs of a plurality of flanges with different diameters. 3 . 3 . The special tool for flange detection according to claim 2 , wherein the diameter of the small hole is φ4mm, and the diameter of the needle bar is φ3.8mm. 4 . 4 . The special tool for flange detection according to claim 3 , wherein the circular flat plate is a steel flat plate. 5 . 5 . The special tool for flange detection according to claim 4 , wherein the diameters of the outer limit holes and the inner limit holes are both φ10mm; the diameters of the cylindrical limit rods are both φ9.8mm. 6 . 6 . The special tool for flange detection according to claim 5 , wherein the cylindrical limiting rod is a steel rod. 7 . 7 . The special tool for flange detection according to claim 6 , wherein a handle is provided on the measuring tool. 8 . 8 . The special tool for flange detection according to claim 7 , wherein the needle bar is a steel needle. 9 .

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