CN211651486U - Nut threaded hole verticality measuring device - Google Patents
Nut threaded hole verticality measuring device Download PDFInfo
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- CN211651486U CN211651486U CN202020418515.4U CN202020418515U CN211651486U CN 211651486 U CN211651486 U CN 211651486U CN 202020418515 U CN202020418515 U CN 202020418515U CN 211651486 U CN211651486 U CN 211651486U
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Abstract
The utility model provides a nut screw hole straightness measuring device that hangs down, measuring device includes location axle (2), measures arm (3), big percentage table (4) and little percentage table (7), and location axle (2), big percentage table (4) and little percentage table (7) are installed on measuring arm (3), two percentage tables are located the both sides of location axle (2) respectively. Screw hole straightness measuring device that hangs down has effectually solved the straightness measurement difficult problem that hangs down of screw hole and nut contact surface on the nut, and the straightness measurement that hangs down of screw hole on the plane of doing is used for, and utilizes the utility model provides a straightness measuring device that hangs down can solve the unable direct measurement's of straightness difficult problem of hanging down behind the processing screw thread, has detection efficiency height, easy operation, convenient to use again, is convenient for observe, measurement accuracy is high, can alone independently accomplish advantages such as detection.
Description
Technical Field
The utility model relates to a straightness measuring device that hangs down of screw hole, concretely relates to accurate measuring device of nut screw hole.
Background
The manhole threaded hole is used for nuclear power products, and whether the contact surface of the threaded hole and a manhole nut is perpendicular or not relates to implementation of a product hydrostatic test and heat exchanger product quality. More the perpendicularity of the conventional threaded hole is measured by confirming the perpendicularity of the hole before drilling, and the perpendicularity of the conventional threaded hole is measured by a machine tool after machining threads, so that direct measurement cannot be realized. The utility model discloses a very big improvement inspection efficiency, improved measurement accuracy, solved nut screw hole straightness measuring difficult problem of hanging down.
SUMMERY OF THE UTILITY MODEL
Based on the above technical background, in order to solve the above problems, the present inventors have conducted an intensive study to design a verticality measuring apparatus for a threaded hole of a nut, the measuring apparatus comprising: the measuring arm, location axle, percentage table, location axle and percentage table are installed perpendicularly on the measuring arm. Nut screw hole straightness measuring device that hangs down can aim at the measurand screw hole fast and measure to ensure the straightness and satisfy the demands that hangs down, very big improvement the ageing of inspection, avoided the unqualified emergence of screw hole straightness that hangs down.
Particularly, the utility model provides a nut screw hole straightness measuring device that hangs down, this kind of device still can be used to measure the straightness that hangs down of ordinary screw hole simultaneously, when improving screw hole straightness inspection efficiency that hangs down, effectively avoids the unqualified emergence of screw hole straightness that hangs down. The device comprises a measuring arm 3, a positioning shaft 2, a large dial indicator 4 and a small dial indicator 7, wherein the positioning shaft 2, the large dial indicator 4 and the small dial indicator 7 are all arranged on the measuring arm 3, the large dial indicator 4 and the small dial indicator 7 are respectively arranged on two sides of the positioning shaft 2, and a dial plate of the large dial indicator 4 and a dial plate of the small dial indicator 7 are both vertical to the measuring arm 3;
the dial plate of the large dial indicator 4 is larger than that of the small dial indicator 7, the dial plate of the large dial indicator 4 and the dial plate of the small dial indicator 7 face the same direction, and a connecting line between the lowest points of the dial plates of the two dial indicators is parallel to the measuring arm 3;
the positioning shaft 2 comprises a small-diameter end and a measuring end, the small-diameter end and the measuring end are coaxial, and the measuring end is provided with an external thread;
the external thread of the measuring end of the positioning shaft 2 is the same as the nominal diameter of the threaded hole to be measured, the thread types are the same, the thread pitches are the same, and the screwing directions are the same.
The distance from the axis of the large dial indicator 4 to the axis of the positioning shaft 2 is equal to the distance from the axis of the small dial indicator 7 to the axis of the positioning shaft 2;
the measuring arm 3 is provided with a shaft hole and a rod hole.
The central line of the shaft hole on the measuring arm 3 is parallel to the central line of the rod hole;
the diameter of the small-diameter end of the positioning shaft 2 is smaller than that of the measuring end, an external thread is arranged at the small-diameter end, the small-diameter end penetrates through a shaft hole in the measuring arm 3, the positioning shaft nut 1 is screwed on the measuring arm 3 through the thread on the small-diameter end, and the positioning shaft 2 is vertically installed on the measuring arm 3.
The small-diameter end of the positioning shaft 2 is in small clearance fit with the shaft hole in the measuring arm 3, and the diameter of the measuring end of the positioning shaft 2 is larger than that of the shaft hole;
the measuring end of the positioning shaft 2 is in small clearance fit with the threaded hole to be measured.
The diameter of the measuring end thread end of the positioning shaft 2 is M48 multiplied by 4-6 g.
The large dial indicator 4 and the small dial indicator 7 are respectively provided with a measuring rod, the measuring rods penetrate through rod holes in the measuring arm 3, and the large dial indicator 4 and the small dial indicator 7 are vertically arranged on the measuring arm 3 through the matching of the nuts 5 and the bolts 6.
The measuring rod of the large dial indicator 4 is in small clearance fit with the rod hole on the measuring arm 3, and the small dial indicator 7 is also in small clearance fit with the rod hole on the measuring arm 3.
The measuring end of the positioning shaft 2, the measuring rod of the big dial indicator 4 and the measuring rod of the small dial indicator 7 are all positioned on the same side of the measuring arm 3;
the distance between the axes of the large dial indicator 4 and the small dial indicator 7 is equal to the length of the thread part at the measuring end of the positioning shaft 2.
The vertical distance of the measuring end thread part of the positioning shaft 2 is the same as the length of the threaded hole to be measured;
the vertical distances from the top end part of the measuring end of the positioning shaft 2 to the top end parts of the measuring rods of the large dial indicator 4 and the small dial indicator 7 are the same.
The vertical distance from the top end part of the measuring end of the positioning shaft 2 to the top end part of the dial indicator measuring rod is smaller than the length of the threaded hole by 4-5 mm.
The utility model discloses the beneficial effect who has includes:
(1) the device is simple, convenient and fast, convenient to use, capable of being independently completed by one person, short in detection time, high in detection speed, small in measurement implementation difficulty and high in precision;
(2) the device can quickly align the threaded holes to be measured and finish measurement one by one, and only needs to be calibrated by a measuring gauge before measurement, so that the operation is convenient and fast, and the efficiency is high;
(3) the screw hole verticality measuring device of the utility model can not only measure the verticality of the screw hole of the nut, but also measure the common screw hole;
(4) screw hole straightness measuring device that hangs down, solved among the nuclear power product the straightness measurement difficult problem that hangs down of manhole bolt screw hole and manhole nut contact surface, effectively guaranteed product pretension hydrostatic test's implementation and heat exchanger product quality.
Drawings
Fig. 1 is a schematic view of the overall structure of a threaded hole verticality measuring device according to a preferred embodiment of the present invention;
fig. 2 is a calibration diagram of a threaded hole verticality measuring device according to a preferred embodiment of the present invention;
fig. 3 is a schematic diagram of the verticality measuring process of the threaded hole verticality measuring device according to a preferred embodiment of the present invention;
fig. 4 shows a side view of a threaded hole perpendicularity measuring device according to a preferred embodiment of the present invention;
fig. 5 shows a schematic view of the nut to be measured.
The reference numbers illustrate:
1-positioning a shaft nut;
2-positioning the shaft;
3-a measuring arm;
4-big dial indicator;
5-a nut;
6-bolt;
7-a small dial indicator;
8-workpiece.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples. The features and advantages of the present invention will become more apparent from the description.
The word "exemplary" is used exclusively herein to mean "serving as an example, embodiment, or illustration. Any embodiment described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments. While the various aspects of the embodiments are presented in drawings, the drawings are not necessarily drawn to scale unless specifically indicated.
The method is used for the implementation of a product pre-tightening hydraulic test and the quality of a heat exchanger product, and the relation between the perpendicularity of a manhole bolt threaded hole and a manhole nut contact surface of a nuclear power product is related. The manhole is composed of a short cylindrical section and a blind plate, and the inner diameter of the manhole is 400-500 mm. More the perpendicularity of the conventional threaded hole is measured by confirming the perpendicularity of the hole before drilling, and the perpendicularity of the conventional threaded hole is measured by a machine tool after machining threads, so that direct measurement cannot be realized. The utility model discloses a very big improvement inspection efficiency, improved measurement accuracy, solved the straightness's of screw hole straightness's a measurement difficult problem, especially nut screw hole and contact surface vertically difficult problem.
The utility model provides a nut screw hole straightness measuring device that hangs down, this kind of measuring device still can be used to the straightness measurement that hangs down of ordinary screw hole simultaneously, screw hole straightness measuring device that hangs down is including measuring arm 3, location axle 2, big percentage table 4 and little percentage table 7 are all installed on measuring arm 3, and big percentage table 4 and little percentage table 7 are installed respectively in the both sides of location axle 2, and the dial plate of big percentage table 4 and the dial plate of little percentage table 7 all are perpendicular with measuring arm 3, as shown in fig. 1 ~ 4.
Because the diameter of the nut contact surface is limited, as shown in fig. 5, therefore, in the utility model, two dial indicators are respectively installed on two sides of the positioning shaft. In order to facilitate the observation of the difference value between the numerical values displayed by the large dial indicator 4 and the small dial indicator 7, the dial plate of the large dial indicator 4 is larger than that of the small dial indicator 7, the dial plates face the same direction, and the connecting line between the lowest points of the dial plates of the two dial indicators is parallel to the measuring arm 3, so that the difference value between the two dial indicators can be observed conveniently, as shown in fig. 1 and 4.
The external thread size of the measuring end of the positioning shaft 2 and the matched requirement of the measured threaded hole are as follows: the nominal diameter is the same, the thread types are the same, the thread pitches are the same, and the rotation directions are the same. The measuring end of the positioning shaft 2 can be screwed into the measured threaded hole.
According to the utility model discloses a preferred embodiment, the axis of big percentage table 4 equals with the axis distance of the axis of little percentage table 7 to location axle 2 to the distance of the axis of location axle 2.
The measuring arm 3 is in a straight plate shape, and a shaft hole and a rod hole are formed in the measuring arm 3. The shaft hole is used for installing the positioning shaft 2, and the rod hole is used for installing the large dial indicator 4 and the small dial indicator 7.
According to the utility model relates to a preferred embodiment, measure the shaft hole central line on the arm 3 and be parallel to each other with pole hole central line to the axis that has effectively guaranteed location axle 2, big percentage table 4 and little percentage table 7 is parallel to each other, is convenient for follow-up with this device carry out the measurement of straightness that hangs down.
The utility model discloses in, the path end is used for fixed position axle 2, makes location axle 2 can fasten on measuring arm 3, the external screw thread is located measuring arm 3's lower part, and the measuring end screw in awaits measuring the screw hole of work piece, as shown in fig. 3 for whole device location, the diameter of this path end is less than the diameter of measuring end. The small-diameter end is provided with threads, the small-diameter end penetrates through a shaft hole in the measuring arm 3, the positioning shaft nut 1 is screwed on the measuring arm 3 through the threads in the small-diameter end, and the positioning shaft 2 is vertically arranged on the measuring arm 3.
According to the utility model relates to a preferred embodiment, the aperture end of location axle 2 is little clearance fit with the shaft hole on measuring arm 3, and the size in aperture is greater than the size of axle promptly in the little clearance, but the size in aperture is less with the size difference of axle.
Preferably, the diameter of the measuring end of the positioning shaft 2 is larger than that of the shaft hole, so that the positioning shaft 2 can be fastened to the measuring arm 3 without relative movement.
According to the utility model discloses further preferred embodiment, for can aim at the measuring screw hole of volume of awaiting measuring fast and accomplish one by one and measure, the measurement end size of location axle 2 is the threaded connection cooperation with being surveyed the screw hole, just location axle 2 measurement end is close clearance fit with the screw hole that awaits measuring, and location axle 2 is coaxial with being surveyed screw hole central line when guaranteeing to measure, and is preferred, the diameter size of location axle 2 measurement end screw thread end is M48 x 4-6 g. Simultaneously, in order to ensure that location axle 2 and under the coaxial condition of quilt survey screw hole central line, can also guarantee that location axle 2 measuring end can be rotated into quilt survey screw hole to guarantee this application the biggest department of inclination that straightness measuring device can measure quilt survey screw hole guarantees measuring precision and degree of accuracy, more preferably, location axle 2 should have better straightness accuracy and cylindricity.
The utility model discloses in, big percentage table 4 and little percentage table 7 all have the measuring stick, and the measuring stick passes the pole hole on measuring arm 3, through nut 5 and bolt 6's cooperation, makes big percentage table 4 and little percentage table 7 install on measuring arm 3, and is preferred, percentage table 4 is installed perpendicularly on measuring arm 3.
According to the utility model relates to a preferred embodiment, the measuring stick of big percentage table 4 is little clearance fit with the pole hole on measuring arm 3, and the pole hole on little percentage table 7 and the measuring arm 3 also is little clearance fit. After the dial indicator 4 is fixed on the measuring rod through the small clearance fit, relative shaking cannot occur, and the accuracy and the precision of the measuring device in the measuring process are ensured.
When the measuring device is used for measuring the verticality of the threaded hole, the top end part of the measuring head of the dial indicator is always in contact with the surface of a workpiece, and the effect of the fulcrum of the whole device is achieved. Consequently, the top portion of big percentage table 4 and little percentage table 7 measuring stick is the hemisphere, and the texture is smooth, can effectively reduce the frictional force between percentage table measuring stick top portion and the measuring arm 3 like this, avoids causing the damage to the measuring workpiece, has also prolonged straightness measuring device's life hangs down.
Among the verticality measuring device, the measuring stick of the measuring end of the positioning shaft 2, the big dial indicator 4 and the small dial indicator 7 are all located at the same side of the measuring arm 3.
According to the utility model relates to a preferred embodiment, distance between big percentage table 4 and the 7 axes of little percentage table equals the length that location axle 2 measured end screw thread part, and the design is for the calculation of convenient straightness that hangs down like this, then uses measuring device measuring straightness that hangs down directly equals big two percentage tables 4 and the absolute value of the numerical difference that shows of little percentage table 7.
According to the utility model relates to a preferred embodiment, the vertical distance that location axle 2 measured end screw thread portion is the same with the length of the screw hole that awaits measuring.
The utility model discloses the top portion of 2 measuring ends of well location axle is the same to the vertical distance in big percentage table 4 and the 7 measuring stick top portions of little percentage table, all is less than 4 ~ 5mm of screw hole length. And the top end part of the measuring rod of the small dial indicator 7 is always in contact with the upper surface of the threaded hole workpiece to be measured in the verticality measuring process.
The utility model discloses a measuring method of screw hole straightness measuring device that hangs down, including following step:
use the utility model relates to an when preferred embodiment carries out the measurement of screw hole straightness that hangs down, it is firstly right to need hang down straightness measuring device calibrates, and the concrete process of calibration is:
perpendicularity measuring device screw in calibrates the rule in, calibrates measuring device, measures the vertical distance of 3 below measuring arms to the calibration rule of 2 both sides of location axle respectively with the micrometer, is h1 and h2 respectively, makes it equal, and leaves the 4 ~ 5mm of compressive capacity of an at least time pitch, then returns zero big percentage table 4 and little percentage table 7, as shown in fig. 2, the cost is accomplished this moment the utility model measuring device's calibration.
the measuring end of the positioning shaft 2 of the threaded hole verticality measuring device to be calibrated is screwed into the threaded hole to be measured, the threaded part of the measuring end needs to be completely screwed into the bottom parallel and level of the threaded hole, as shown in fig. 3, at the moment, the top ends of the measuring rods of the large dial indicator 4 and the small dial indicator 7 are propped against the surface of the workpiece 8, and in the measuring process, the top end of the measuring rod of the small dial indicator 7 needs to be always kept in contact with the upper surface of the workpiece 8.
And 3, screwing out the measuring end of the positioning shaft 2 for 360 degrees in a circle.
Will measuring device location axle 2's measuring end is followed screw hole bottom and is unscrewed 360, and the in-process of unscrewing needs to make the top portion of two percentage table measuring sticks push up all the time at work piece 8 on the surface, and the in-process of the rotatory 360 scope of record location axle 2, the absolute value of the maximum difference value that two percentage tables same positions show is marked as X1. The length of the threaded hole is marked L2When in measurement, the vertical distance between the axes of the measuring rods of the two dial indicators 4 is L1As shown in fig. 3, according to the similar triangle principle:
the verticality is X2＝X1/L1×L2。
If the distance between the axes of the large dial indicator 4 and the small dial indicator 7 is equal to the length of the thread part at the measuring end of the positioning shaft 2, the verticality measured by the device is directly equal to the absolute value of the difference value of the numerical values displayed by the two dial indicators.
In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front", "rear", and the like indicate the position or positional relationship based on the operating state of the present invention, and are only for convenience of description and simplification of the description, but do not indicate or imply that the device or element indicated must have a specific position, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.
The present invention has been described above in connection with preferred embodiments, which are merely exemplary and illustrative. On this basis, can be right the utility model discloses carry out multiple replacement and improvement, these all fall into the utility model discloses a protection scope.
Claims (10)
1. A verticality measuring device for a threaded hole of a nut is characterized in that,
the verticality measuring device comprises a measuring arm (3), a positioning shaft (2), a large dial indicator (4) and a small dial indicator (7), wherein the positioning shaft (2), the large dial indicator (4) and the small dial indicator (7) are all arranged on the measuring arm (3), the large dial indicator (4) and the small dial indicator (7) are respectively arranged on two sides of the positioning shaft (2), and a dial plate of the large dial indicator (4) and a dial plate of the small dial indicator (7) are both vertical to the measuring arm (3);
the dial plate of the large dial indicator (4) is larger than that of the small dial indicator (7), the dial plate of the large dial indicator (4) and the dial plate of the small dial indicator (7) face the same direction, and a connecting line between the lowest points of the dial plates of the two dial indicators is parallel to the measuring arm (3);
the positioning shaft (2) comprises a small-diameter end and a measuring end, the small-diameter end and the measuring end are coaxial, and the measuring end is provided with an external thread;
the external thread of the measuring end of the positioning shaft (2) is the same as the nominal diameter of the threaded hole to be measured, the thread types are the same, the thread pitches are the same, and the screwing directions are the same.
2. Perpendicularity measuring apparatus according to claim 1,
the distance from the axis of the large dial indicator (4) to the axis of the positioning shaft (2) is equal to the distance from the axis of the small dial indicator (7) to the axis of the positioning shaft (2);
the measuring arm (3) is provided with a shaft hole and a rod hole.
3. Perpendicularity measuring apparatus according to claim 2,
the central line of the shaft hole on the measuring arm (3) is parallel to the central line of the rod hole;
the diameter of the small-diameter end of the positioning shaft (2) is smaller than that of the measuring end, an external thread is arranged at the small-diameter end, the small-diameter end penetrates through a shaft hole in the measuring arm (3), the positioning shaft nut (1) is screwed on the measuring arm (3) through the thread on the small-diameter end, and the positioning shaft (2) is vertically installed on the measuring arm (3).
4. Perpendicularity measuring apparatus according to claim 3,
the small-diameter end of the positioning shaft (2) is in small clearance fit with the shaft hole in the measuring arm (3), and the diameter of the measuring end of the positioning shaft (2) is larger than that of the shaft hole;
the measuring end of the positioning shaft (2) is in small clearance fit with the threaded hole to be measured.
5. Perpendicularity measuring apparatus according to claim 4,
the diameter of the measuring end thread end of the positioning shaft (2) is M48 multiplied by 4-6 g.
6. Perpendicularity measuring apparatus according to claim 2,
the large dial indicator (4) and the small dial indicator (7) are respectively provided with a measuring rod, the measuring rods penetrate through rod holes in the measuring arm (3), and the large dial indicator (4) and the small dial indicator (7) are vertically arranged on the measuring arm (3) through the matching of nuts (5) and bolts (6).
7. Perpendicularity measuring apparatus according to claim 6,
the measuring rod of the large dial indicator (4) is in small clearance fit with the rod hole in the measuring arm (3), and the small dial indicator (7) is in small clearance fit with the rod hole in the measuring arm (3).
8. Perpendicularity measuring apparatus according to claim 6,
the measuring end of the positioning shaft (2), the measuring rod of the big dial indicator (4) and the measuring rod of the small dial indicator (7) are all positioned on the same side of the measuring arm (3);
the distance between the axes of the large dial indicator (4) and the small dial indicator (7) is equal to the length of the thread part at the measuring end of the positioning shaft (2).
9. Perpendicularity measuring apparatus according to claim 8,
the vertical distance of the measuring end thread part of the positioning shaft (2) is the same as the length of the threaded hole to be measured;
the vertical distances from the top end part of the measuring end of the positioning shaft (2) to the top end parts of the measuring rods of the large dial indicator (4) and the small dial indicator (7) are the same.
10. Perpendicularity measuring apparatus according to claim 9,
the vertical distance from the top end part of the measuring end of the positioning shaft (2) to the top end part of the dial indicator measuring rod is less than 4-5 mm of the length of the threaded hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020418515.4U CN211651486U (en) | 2020-03-27 | 2020-03-27 | Nut threaded hole verticality measuring device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020418515.4U CN211651486U (en) | 2020-03-27 | 2020-03-27 | Nut threaded hole verticality measuring device |
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| Publication Number | Publication Date |
|---|---|
| CN211651486U true CN211651486U (en) | 2020-10-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020418515.4U Active CN211651486U (en) | 2020-03-27 | 2020-03-27 | Nut threaded hole verticality measuring device |
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| Country | Link |
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| CN (1) | CN211651486U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659485A (en) * | 2022-05-19 | 2022-06-24 | 成都飞机工业（集团）有限责任公司 | Compact high-precision hole perpendicularity measuring device and using method |
-
2020
- 2020-03-27 CN CN202020418515.4U patent/CN211651486U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114659485A (en) * | 2022-05-19 | 2022-06-24 | 成都飞机工业（集团）有限责任公司 | Compact high-precision hole perpendicularity measuring device and using method |
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