CN202221293U

CN202221293U - Measuring scale of non-roundness of steel pipe

Info

Publication number: CN202221293U
Application number: CN2011203368801U
Authority: CN
Inventors: 朱瑞华
Original assignee: MCC LIAONING DRAGON PIPE INDUSTRIES Co Ltd
Current assignee: MCC LIAONING DRAGON PIPE INDUSTRIES Co Ltd
Priority date: 2011-09-08
Filing date: 2011-09-08
Publication date: 2012-05-16
Anticipated expiration: 2021-09-08

Abstract

The utility model relates to a field of non-roundness measurement of steel pipes, and especially to a measuring scale of non-roundness of a steel pipe. It is characterized in that the measuring scale includes a pedestal, a threaded sheath, a guide post, a spring, a scale rod and a probe. The pedestal is in a T-shaped structure. Rollers are arranged on two sides of the pedestal symmetrically. The pedestal and the scale rod are connected together through the threaded sheath. The probe is arranged on the front end of the scale rod. The guide post is arranged in the center part of the scale rod. The spring is disposed between the guide post and the tail of the probe. A scale window is arranged on the scale rod. The compression range of the spring is in changing range of the wall thickness of the steel pipe and the non-roundness. A lengthening rod is also arranged in the threaded sheath. The front end of the probe is perfectly round. Compared with the prior art, the measuring scale of the non-roundness of the steel pipe in the utility model and has advantages of meeting actual requirements in the steel pipe non-roundness measurement currently, reducing measurement working load, simplifying the operation, facilitating the measurement, improving the measurement accuracy and satisfying requirements in measuring the non-roundness of pipes having different pipe diameters.

Description

A kind of steel pipe non-roundness measurement chi

Technical field

The utility model relates to steel pipe out-of-roundness detection range, relates in particular to a kind of steel pipe non-roundness measurement chi.

Background technology

Be that spiral welded pipe or ERW all exist certain out-of-roundness error in the process of making, for guaranteeing that steel pipe is qualified, the out-of-roundness that must detect these steel pipes is in the scope of quality standard regulation.Conventional measuring method is to measure the external diameter of the pipe end of steel pipe with slide calliper rule, through repeatedly measuring, finds out the maximum gauge and the minimum diameter of steel pipe, and the difference that deducts minimum diameter with maximum gauge then is the out-of-roundness of steel pipe.Owing in the process of measuring, need repeatedly more just can find maximum gauge and minimum diameter, also need do difference after writing down numerical value, waste time and energy in the process of measurement, be easy to generate error.Slide calliper rule are at 2 with outer diameter of steel pipes and contact in addition, when two measurement point lines of slide calliper rule are vertical with the steel pipe axle center, can not bring measuring error.

The utility model content

The purpose of the utility model provides a kind of steel pipe non-roundness measurement chi, overcomes the deficiency of prior art, reduces the surveying work amount, improves the accuracy of measuring, and convenient measurement satisfies the requirement of present steel pipe non-roundness measurement.

For solving the problems of the technologies described above, the technical scheme of the utility model is:

A kind of steel pipe non-roundness measurement chi comprises base, swivel nut, guide pillar, spring, scale bar and probe, and base is a T shape structure; Symmetria bilateralis is provided with roller, is connected through swivel nut between base and the scale bar, and the scale bar front end is provided with probe; Scale bar heart portion is provided with guide pillar; Be provided with spring between guide pillar and the probe tail end, scale bar is provided with dial window, and the compression zone of spring is in thickness of steel pipe and out-of-roundness variation range.

Also be provided with extension rod in the middle of the said swivel nut.

Said probe front end is perfectly round.

Compared with prior art; The beneficial effect of the utility model is: satisfies the actual requirement of present steel pipe non-roundness measurement, reduces the surveying work amount, and simple to operate; Convenient measurement; Improve the accuracy of measuring, measuring speed is fast, can satisfy the measurement of different tube diameters out-of-roundness through adjustment swivel nut and extension rod.

Description of drawings

Fig. 1 is the utility model dip stick embodiment one structural representation;

Fig. 2 is the utility model dip stick embodiment two structural representations.

Among the figure: 1-base 2-swivel nut 3-guide pillar 4-spring 5-scale bar 6-probe 7-roller 8-jump ring 9-dial window 10-steel pipe 11-extension rod

Embodiment

Be described further below in conjunction with the embodiment of accompanying drawing the utility model:

Seeing Fig. 1, is a kind of dip stick embodiment one structural representation of the utility model, comprises base 1, swivel nut 2, guide pillar 3, spring 4, scale bar 5 and pops one's head in 6; Base 1 is a T shape structure, and both sides are arranged with roller 7 through jump ring 8, is connected through swivel nut 2 between base 1 and the scale bar 5; Scale bar 5 front ends are provided with probe 6, and scale bar 5 heart portions are provided with guide pillar 3, are provided with spring 4 between guide pillar 3 and probe 6 tail ends; Scale bar 5 is provided with dial window 9, and through calculating, the compression zone of spring 4 is in thickness of steel pipe and out-of-roundness variation range; 6 front ends of popping one's head in are perfectly round, and two rollers 7 form supported at three point with probe 6 and steel pipe 10 inwalls, according to 3 principles of confirming a circle; Guarantee that dip stick is in plumbness all the time at steel pipe 10 inwalls, the measuring error that cause in out of plumb steel pipe axle center when overcoming dip stick and contacting with 2 of steel pipe inwalls.

When measuring φ 219mm steel pipe, dip stick can move freely at steel pipe 10 inwalls, even there is the inside weld reinforcement also can not influence the rotation of roller 7.Swivel nut 2 outside surfaces are done annular knurl and are handled, and conveniently hold, and there is internal thread at inner two ends.Guide pillar 3 guarantees that spring 4 is in correct position; Spring 4 is a compression spring, through the compression and the resilience of spring, probe 6 is contacted all the time with steel pipe 10 inwalls.When spring 4 did not compress, roller 7 was adjusted by outer diameter of steel pipes with the distance of probe 6, and after length of spring compressed, the probe afterbody should be wanted the scale centre position, and when preventing that out-of-roundness is excessive, the no to scale scope causes and measures failure.

Seeing Fig. 2, is a kind of dip stick embodiment two structural representations of the utility model, when measuring the big caliber steel pipe of φ 630mm, also can establish extension rod 11 in the middle of the swivel nut 2, and other structure is with embodiment one.

A kind of steel pipe non-roundness measurement of the utility model method; The difference that only needs to measure pipe end one all interior maximum inner diameters and minimum diameter is the steel pipe out-of-roundness; And needn't accurately measure the concrete inner diameter values in everywhere, dip stick is provided with supported at three point on the steel pipe inwall, guarantee that dip stick vertically passes through the steel pipe axle center; Reduce measuring error, its concrete operations step is following:

1) dip stick is stretched into the pipe end inner radius, base and probe and steel pipe inwall form supported at three point, guarantee that dip stick is in vertical steel inside pipe wall state;

2) read the probe tail end place scale of scale bar high scale window, the probe tail end is as far as possible in the scale middle position, conveniently to read scale;

3) holding swivel nut rotates a circle dip stick along the steel pipe inwall; Note observing the variation of probe tail end place scale in the dial window in the rotary course; The reading of probe tail end when reading corresponding maximum inner diameter and minimum diameter simultaneously, full-scale reading and least count difference are the out-of-roundness of steel pipe.

Claims

1. a dip stick is characterized in that, comprises base, swivel nut, guide pillar, spring, scale bar and probe; Base is a T shape structure, and symmetria bilateralis is provided with roller, is connected through swivel nut between base and the scale bar; The scale bar front end is provided with probe, and scale bar heart portion is provided with guide pillar, is provided with spring between guide pillar and the probe tail end; Scale bar is provided with dial window, and the compression zone of spring is in thickness of steel pipe and out-of-roundness variation range.

2. a kind of dip stick according to claim 1 is characterized in that, also is provided with extension rod in the middle of the said swivel nut.

3. a kind of dip stick according to claim 1 and 2 is characterized in that, said probe front end is perfectly round.