1. The method for detecting the flatness of the end surface of the taper pipe is characterized in that an end casting is installed at the end part of the taper pipe, and the detection steps are as follows:

(1) arranging the taper pipe on the roller carrier to ensure that the horizontal elevations at the two ends of the taper pipe are consistent;

(2) fixing the tool rack opposite to the end casting;

(3) one end of the ejector pin rod is fixed on the tool frame, and the other end of the ejector pin rod is inserted into the circle center of the end casting;

(4) fixing the dial indicator, and enabling a measuring pin of the dial indicator to be in contact with the edge of the end casting;

(5) rotating the roller frame, and measuring by the reading of a dial indicator to obtain an end face flatness value;

(6) adjusting: and (5) adjusting the angle of the end casting according to the reading of the dial indicator, repeating the step (5), and finally adjusting the reading of the dial indicator to be within the range of 0.2mm so as to reinforce the end casting.

2. The method for detecting the flatness of the end face of the taper pipe according to claim 1, wherein: at least two groups of rollers are arranged on the roller frame, the two groups of rollers are distributed at different heights, and the members are arranged between the rollers.

3. The method for detecting the flatness of the end face of the taper pipe according to claim 2, wherein: the two groups of rollers are on the same semicircle, so that the component is in contact with the two groups of rollers.

4. The method for detecting the flatness of the end face of the taper pipe according to claim 1, wherein: the rotating speed of the roller frame is 5-15 revolutions per minute.

5. The method for detecting the flatness of the end face of the taper pipe according to claim 1, wherein: and the end casting is provided with a connecting plate, and the ejector pin rod is arranged on the end casting through an ejector pin of the connecting plate.

6. The method for detecting the flatness of the end face of the taper pipe according to claim 5, wherein: the connecting plate and the ejector pin rod are mutually perpendicular, and the assembling angle deviation of the end casting can be judged through the dial indicator after the end casting is tightly attached to the connecting plate and rotates.

7. The method for detecting the flatness of the end face of the taper pipe according to claim 1, wherein: the dial indicator is installed at the fixed tool support.

Background

With the rapid development of the steel structure industry, more and more enterprises are added into the steel structure team, and the competition among the steel structure industry is more and more intense. While steel structure products themselves are becoming more and more complex, the quality control requirements of customers are also becoming higher and higher. In particular to international engineering, the method not only has extremely high requirements on quality control of factory manufacture, but also has extremely strict requirements on field installation precision. Take HKPCB project as an example:

the number of the taper pipe inclined struts for connecting the roof and the column top in the HKPCB project is 200, the lengths are 10430-14350 mm, the wall thicknesses are 25mm, 28mm and 32mm, and the end face diameters of the taper pipes are 800 mm.

Referring to fig. 1, each taper pipe diagonal brace is composed of a taper pipe 1a, a taper pipe 2a, a strut end casting 3a and a casting locking head 4a. During manufacturing, the first conical pipe 1a and the second conical pipe 2a are in butt joint, the lower end of the first conical pipe 1a after butt joint is in butt joint with the pillar end casting 3a, and the upper end of the second conical pipe 2a after butt joint is in field welding with the casting lock head 4a. The upper end of the taper pipe inclined strut, namely the end where the casting locking head 4a is located, is connected with a main beam pin shaft, the error of the pin shaft connecting end is +/-3 mm, the lower end, namely the end where the strut end casting 3a is located, is connected with a node casting bolt, and the gap of the bolt connecting end junction surface (the maximum gap between the taper pipe end tip end casting end surface and the node casting end surface) is 0.2 mm.

For a taper pipe inclined strut with a longer specification, if the flatness of the end face deviates by 0.5mm, the upper end of the inclined strut deviates by 17.5 mm. This requires that the precision of the component be strictly controlled when the taper pipe bracing is manufactured, and particularly the flatness of the end face of the taper pipe is within 0.2 mm. And idle people such as the quality acceptance method of the conventional pendant and the guiding rule cannot meet the precision requirement.

Disclosure of Invention

In view of this, the present application provides a method for detecting the flatness of an end surface of a taper pipe, which can effectively ensure the manufacturing accuracy and improve the inspection efficiency.

Specifically, the method is realized through the following scheme:

a method for detecting the flatness of the end surface of a taper pipe is characterized in that an end casting is installed at the end part of the taper pipe, and the method comprises the following steps:

(1) arranging the taper pipe on the roller carrier to ensure that the horizontal elevations at the two ends of the taper pipe are consistent;

(2) fixing the tool rack opposite to the end casting;

(3) one end of the ejector pin rod is fixed on the tool frame, and the other end of the ejector pin rod is inserted into the circle center of the end casting;

(4) fixing the dial indicator, and enabling a measuring pin of the dial indicator to be in contact with the edge of the end casting;

(5) rotating the roller frame, and measuring by the reading of a dial indicator to obtain an end face flatness value;

(6) adjusting: and (5) adjusting the angle of the end casting according to the reading of the dial indicator, repeating the step (5), and finally adjusting the reading of the dial indicator to be within the range of 0.2mm so as to reinforce the end casting.

In the detection process of the flatness of the end face of the taper pipe, the precision of the steel structure member is controlled by means of the high precision (0.001 mm) of the dial indicator. A tooling frame is first fabricated and then fixed. On one hand, the tool needs the thimble to the center of a rotating taper pipe, on the other hand, the measuring needle moved by the dial indicator is contacted with the edge of the pillar end casting, and the verticality of the end surface of the taper pipe is accurately read out through scales on the dial indicator. The problem that methods such as a pendant and a running rule cannot solve is solved, and the method is high in accuracy and high in efficiency.

For steel structure products with high precision requirements and more special equipment at present, if the conventional suspension wire and guiding rule inspection method is adopted, a large amount of time and energy can be wasted, and the requirement on the manufacturing precision and quality of the components cannot be ensured due to the limitation of the inspection mode.

The method is simple, clear, easy to operate and high in precision, and can achieve the precision which cannot be achieved by the conventional measuring method; the operation process is simple, real-time measurement can be realized, accumulated errors are avoided, and the component precision is ensured.

Further, as preferable:

the roller frame is provided with at least two groups of rollers, the two groups of rollers are distributed at different heights, and the members are arranged among the rollers, so that the members can accurately roll along with the rollers when the roller frame is rotated. More preferably, the two sets of rollers are on the same semicircle, so that the member is in contact with both sets of rollers, and the position of the center of circle can be conveniently controlled.

The rotation speed of the roller frame is about 10 revolutions per minute (preferably 5-15 revolutions per minute). During measurement, the roller frame is not suitable for rotating too fast, and fast fluctuation is easily caused to dial indicator reading, so that actual numerical values are affected.

And the end casting is provided with a connecting plate, and the ejector pin rod is arranged on the end casting through an ejector pin of the connecting plate. The connecting plate and the ejector pin rod are mutually perpendicular, and the assembling angle deviation of the end casting can be judged through the dial indicator after the end casting and the connecting plate are tightly attached and rotate

The dial indicator is installed at the fixed tool support, and can be effectively pushed to the end casting to ensure that the dial indicator does not displace in the testing process.

The detection method provided by the application is wide in application, can be used for general high-precision measurement in steel structure production, and particularly has special effects on the perpendicularity of the end face of a component and the surface flatness.

(1) Can meet the requirement of high precision.

(2) The cost investment is low, the operation is convenient and fast, and the efficiency is high. In this application testing process, mainly with the help of amesdial, gyro wheel frame and other auxiliary stay, the cost drops into lowly, easy operation, convenient, detection efficiency is high. With the auxiliary equipment ready, it takes only about 2 minutes to test one component.

(3) The production process of the component can be monitored in the whole process. The end casting and the components (the taper pipe I and the taper pipe II) are assembled, welding is carried out, the whole process can be carried out from the measurement after welding, the deviation can be adjusted at once, the accumulation of errors is reduced, and the waste of manpower, financial resources, time and the like caused by the rectification after welding is avoided.

Drawings

FIG. 1 is a schematic structural view of a taper pipe diagonal brace;

FIG. 2 is a schematic view of the detection process of the present application;

FIG. 3 is a schematic view of the structure of the detection part of the present application;

FIG. 4 is a schematic view of the relationship between the thimble and the end casting;

FIG. 5 is a graph of the effect of the gapless installation achieved after operation of the present method;

fig. 6 is a diagram of the installation effect of the taper pipe diagonal brace realized after the detection by the method.

Reference numbers in the figures: 1a, a first taper pipe; 2a, a conical pipe II; a pillar end casting; a casting lock; 1. a member; 2. a roller frame; 21. a lower roller; 22. an upper roller; 3. an end casting; 4. a connecting plate; 5. a thimble rod; 6. a tool rack; 7. and (5) a dial indicator.

Detailed Description

Taking a taper pipe inclined strut as an example, 200 taper pipe inclined struts which are connected with a roof and a column top in the HKPCB project have different lengths of 10430-14350 mm, different wall thicknesses of 25mm, 28mm and 32mm and 800mm of diameter of the end face of a taper pipe. Referring to fig. 1, each taper pipe diagonal brace is composed of 2 taper pipes (a taper pipe 1a, a taper pipe 2 a), 1 prop end casting (a pillar end casting 3 a), and 1 casting locking head 4a.

With reference to fig. 2, the assembly process includes the following steps:

in a first step, the roller frame 2 is fixed and the component 1 is placed on the roller frame 2.

And secondly, fixing the tool frame 6, fixing one end of the thimble rod 5 on the tool frame 6, and ejecting the thimble at the other end to the center of the end casting 3.

And thirdly, fixing the dial indicator 7, and contacting a measuring pin of the dial indicator 7 (with the precision of 0.001 mm) with the edge of the end casting 3.

Fourthly, the roller frame 2 is rotated, and the numerical value of the planeness of the end face of the taper pipe (namely, the face of the end casting 3 facing the tool frame 6 in the figure 4) is read through the reading of the dial indicator 7, so that the verticality of the end face of the taper pipe is ensured to be within 0.2 mm.

In the process, on one hand, the tool frame 6 needs the thimble to the center of the end casting 3/vertebral canal in rotation, on the other hand, the measuring needle moved by the dial indicator 7 is contacted with the edge of the end casting 3, and the verticality of the end surface of the vertebral canal is accurately read through the scales on the dial indicator 7.

The following points are to be noted during operation:

(1) the tool frame 6 is firm, so that the ejector pin 5 is prevented from displacing in the measuring process;

(2) the thimble rods 5 must be pushed to the center of the end casting 3;

(3) the dial indicator 7 can not displace during measurement;

(4) the roller carrier 2 is not suitable for rotating too fast during measurement;

(5) the dimension inspection is carried out in real time in the manufacturing process, and particularly, the welding deformation is monitored and timely adjusted at any time in the welding process.

As an alternative: at least two groups of rollers are arranged on the roller frame 2, namely a group of lower rollers 21 and a group of upper rollers 22, the group of lower rollers 21 are symmetrically distributed on two sides of the component, the group of upper rollers 22 are symmetrically distributed on two sides of the component, and the lower rollers 21 and the upper rollers 22 are positioned at different heights, so that when the component 1 is arranged between the rollers, the component 1 can be contacted with the two groups of rollers, and the component 1 can accurately roll along with the rollers when the roller frame 2 is rotated.

Preferably, the lower roller 21 and the upper roller 22 are on the same semi-circle, so that the member 1 contacts with both sets of rollers, thereby facilitating the control of the position of the center of circle.

As an alternative: the roller frame 2 is driven by a motor to rotate, the rotating speed of the roller frame 2 can be controlled, the rotating speed is about 10 revolutions per minute, the roller frame 2 cannot rotate too fast during measurement, and fast fluctuation is easily caused to dial gauge reading to influence an actual numerical value.

As an alternative: the end casting 3 is provided with a connecting plate 4, and the thimble rod 5 is arranged on the end casting 3 through a thimble of the connecting plate 4. The connecting plate and the ejector pin rod are mutually perpendicular, and the assembling angle deviation of the end casting can be judged through the dial indicator after the end casting and the connecting plate are tightly attached and rotate

As an alternative: the amesdial is installed in fixed frock support department, satisfies on the amesdial can effectual top end foundry goods to ensure that in the test process, amesdial 7 does not take place the displacement.

Benefit analysis

On the one hand, the main equipment of the application is a dial indicator, a roller frame and other auxiliary supports. Low cost investment, simple and convenient operation. The detection efficiency is high, and only 2 minutes are needed for detecting one component under the condition that the auxiliary equipment is ready. Saving time, financial resources and manpower.

On the other hand, the method has been successful in the HKPCB project, and the gapless installation of the taper pipe inclined strut is realized by combining the graph shown in the figure 5 and the figure 6, so that the approval of owners and general packages is obtained. The recognition degree of the owners and the general packages to our fine works is improved, so that the subsequent project work can be carried out more smoothly. Meanwhile, the successful case of the HKCPCB project improves the influence of the fine work in the steel structure ring, so that the development prospect of the fine work is more bright.

The successful application of the method not only improves the economic benefit of a factory, but also more importantly improves the intangible social benefit of the precision work.