CN212109945U

CN212109945U - Elbow measuring device

Info

Publication number: CN212109945U
Application number: CN202020573234.6U
Authority: CN
Inventors: 刘联红; 卢健兵; 吴志江; 江海燕; 黄勋
Original assignee: Guangzhou Wenchong Shipyard Co Ltd
Current assignee: Guangzhou Wenchong Shipyard Co Ltd
Priority date: 2020-04-17
Filing date: 2020-04-17
Publication date: 2020-12-08
Anticipated expiration: 2030-04-17

Abstract

The measuring device comprises a measuring platform, a transverse reference plate and a longitudinal reference plate which are vertically arranged on the measuring platform, and an auxiliary block which is abutted against the inner side of the bent pipe. The method comprises the steps of placing a bent pipe to be measured on a measuring platform, wherein the side edges of two auxiliary blocks are aligned with the boundary line of a straight section and a bent section of the bent pipe, the other two auxiliary blocks are abutted against two straight pipe sections of the bent pipe, measuring the distance between the two auxiliary blocks and the tail ends of the two straight pipe sections, simultaneously establishing a rectangular coordinate system and measuring coordinate values of the centers of the four auxiliary blocks, and calculating the bent pipe data required by the lengths of the two straight pipe sections of the bent pipe, the lengths of two pipe points, the bending angle of the bent section, the axial length including the arc length of the bent section and the like according to the data. The bent pipe measuring device is extremely simple in structure, but the required bent pipe data can be conveniently, quickly and accurately obtained through the measuring method, the manufacturing cost is low, the accuracy is high, and the bent pipe measuring device can be effectively popularized.

Description

Elbow measuring device

Technical Field

The utility model relates to a measuring device especially relates to a return bend measuring device that is used for return bend resilience and extension to revise.

Background

The traditional manufacturing mode of shipbuilding pipe processing is bending before welding, and the production efficiency is low. The efficient production mode is that welding is carried out before bending, namely end accessories are welded on a straight pipe, then bending processing is carried out, and final forming is carried out, so that springback and extension are generated in the pipe bending process, and correction compensation of a pipe bending procedure and blanking length must be solved. Since the deformation of the pipe during bending is affected by various factors, the deformation cannot be obtained simply through mathematical model calculation, and only compensation quantities of various specifications, materials and bending angles can be obtained through field bending test, so that a correction parameter database is formed, but a large amount of complicated measurement calculation work is required.

At present, the bent pipe is measured mainly by hand, a simple angle ruler is used, and tools such as a vernier angle ruler are often used for matching measurement, but the measurement precision and the efficiency are low, and data such as pipe point length and axis length of a pipe cannot be directly measured. There are also advanced measurement devices and methods, such as three-dimensional laser scanning/photography, which can fully automate the three-dimensional scanning modeling of tubes, and are generally suitable for use in aerospace, automotive, etc. applications, but these measurement devices are extremely expensive and many times must be specifically tailored to the needs.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a simple structure, easy and simple to handle and return bend measuring device that the precision is high to convenient and fast ground accurate measurement and reachs the return bend parameter.

The utility model discloses a bent pipe measuring device, which comprises a measuring platform for placing a pipe to be measured, wherein a transverse reference plate and a longitudinal reference plate which are mutually perpendicular are arranged on the measuring platform; and the other four auxiliary blocks are placed on the measuring platform and are abutted against the outer side surface of the pipe.

The elbow measuring device of the utility model places the elbow to be measured on the measuring platform, the bending section of the elbow faces to the intersection of the transverse reference plate and the longitudinal reference plate, and one section of the straight pipe section of the elbow is attached to the transverse reference plate or the longitudinal reference plate; then placing the elbow to be measured on the measuring platform, wherein the bending section of the elbow faces to the intersection of the transverse reference plate and the longitudinal reference plate, and one section of the straight pipe section of the elbow is attached to the transverse reference plate or the longitudinal reference plate; then, establishing a rectangular coordinate system by taking the intersection of the transverse reference plate and the longitudinal reference plate as a circle center O and the directions of the transverse reference plate and the longitudinal reference plate as an X axis and a Y axis; then, measuring coordinate values of the centers of the four auxiliary blocks, and measuring the distance between the tail end of the straight pipe section and one side, facing the tail end of the straight pipe section, of the auxiliary block adjacent to the tail end of the straight pipe section; therefore, the required bent pipe data can be calculated through the data, and the required bent pipe data comprises the lengths of the two straight pipe sections of the bent pipe, the lengths of two pipe points, namely the distance from the intersection point of the axes of the two straight pipe sections to the tail ends of the two straight pipe sections, the bending angle of the bent section, the distance between the theoretical bending point and the marked bending point and the like.

The utility model discloses a bent pipe measuring device, the bent pipe to be measured is placed on the measuring platform, the middle part of the bent pipe is bent, and the two ends are straight pipe sections, and the straight and bent transition positions are marked with demarcation points in the processing process; then, the auxiliary blocks are placed to be abutted against each position section of the bent pipe, so that the coordinate values of the auxiliary blocks and the distances between the two auxiliary blocks and the tail ends of the two straight pipe sections can be simply and quickly measured, and then the data of the bent pipe can be calculated through the data; in view of the simple calculation method, the calculation can be performed manually, and in order to improve the accuracy and the calculation speed of the calculation, the required data can be obtained by establishing a calculation formula on software or inputting measured values into a software program by using a specific software program. The bent pipe measuring device is extremely simple in structure, but the required bent pipe data can be conveniently, quickly and accurately obtained through the measuring method, the manufacturing cost is low, the accuracy is high, and the bent pipe measuring device can be effectively popularized.

Drawings

Fig. 1 is a schematic structural view of a bent pipe measuring apparatus.

Fig. 2 is a schematic structural diagram of an auxiliary block.

Fig. 3 is a schematic view of the usage state of the elbow measurement device.

FIG. 4 is a measurement schematic of a bent pipe measurement method.

Fig. 5 is a schematic diagram of the placement positions of the auxiliary blocks in the state of bending pipes with different lengths.

FIG. 6 is a schematic diagram of a position marking and calculation method for a bent pipe measurement method.

Detailed Description

As shown in fig. 1-3, a bent pipe measuring device comprises a measuring platform 1 for placing a pipe to be measured, wherein a transverse reference plate 2 and a longitudinal reference plate 3 which are perpendicular to each other are arranged on the measuring platform; and four auxiliary blocks 4 which are arranged on the measuring platform and are abutted against the outer side surface of the pipe.

According to the elbow measuring device, the height of the transverse reference plate 2, the height of the longitudinal reference plate 3 and the height of the auxiliary block 4 are the same, in addition, the auxiliary block 4 is a square body with a square cross section, and the center of the top surface of the auxiliary block is marked with an auxiliary mark 5. The elbow measuring device with the structure is more convenient to use, and the measurement is also quicker and more accurate.

A bent pipe measuring method comprises the following steps:

A. placing a bent pipe to be measured on a measuring platform, wherein the bent section of the bent pipe faces to the intersection of the transverse reference plate and the longitudinal reference plate, and one straight pipe section of the bent pipe is attached to the transverse reference plate or the longitudinal reference plate;

B. placing four auxiliary blocks on the measuring platform, wherein the four auxiliary blocks are abutted against two straight pipe sections of the elbow in pairs respectively, and one side of the middle two auxiliary blocks back to the end part of the straight pipe section is aligned with the elbow section of the elbow and the boundary point of the straight pipe section;

C. establishing a rectangular coordinate system by taking the intersection of the transverse reference plate and the longitudinal reference plate as a circle center O and the directions of the transverse reference plate and the longitudinal reference plate as an X axis and a Y axis;

D. measuring coordinate values of the centers of the four auxiliary blocks;

E. measuring distances S1 and S2 between the tail end of the straight pipe section and one side of the auxiliary block adjacent to the tail end of the straight pipe section, which faces the tail end of the straight pipe section;

F. the required bent pipe data is calculated through the data, and the required bent pipe data comprises the lengths of two straight pipe sections of the bent pipe, the lengths of two pipe points, namely the distance from the intersection point of the axes of the two straight pipe sections to the tail ends of the two straight pipe sections, the bending angle of the bent section, the distance between a theoretical bending stop point and a marked bending stop point and the like.

In the step B, when the four auxiliary blocks are placed on the measuring platform, the auxiliary blocks are placed on one side of the elbow, which faces away from the transverse reference plate and the longitudinal reference plate, and the side, facing the bending part, of the middle two auxiliary blocks is superposed with the plane of the diameter of the intersection of the bent section and the straight section of the elbow. Through the arrangement of the methods, the related data can be measured more conveniently.

As shown in fig. 3 and 4, a rectangular coordinate system is established by taking the intersection of the transverse reference plate and the longitudinal reference plate as a circle center O, the transverse reference plate as an X axis and the longitudinal reference plate as a Y axis; then the elbow is placed on the measuring platform, the

auxiliary blocks

41 and 42 are abutted against the right side of the left straight pipe section 11, the

auxiliary blocks

43 and 44 are abutted against the upper side of the right straight pipe section 13, and one adjacent side edges of the

auxiliary blocks

42 and 43 are respectively aligned with a straight section dividing line P, Q and a bent section dividing line P, Q of the elbow; then measuring coordinate values (X1, Y1), (X2, Y2), (X3, Y3), (X4, Y4) of the four auxiliary blocks, and distances S1, S2 between the

auxiliary blocks

41, 44 and the ends of the two straight pipe sections; the required elbow data can then be calculated, such as the lengths Z1, Z2 of the two straight tube sections, the two tube point lengths L1, L2, the bend angle α of the curved section, and so on.

As shown in fig. 6, let the side length of the auxiliary block be F, the diameter of the pipe be D, and let the coordinates: the end point of one straight pipe section of the pipe is C1, the starting bending point is C2, the theoretical bending stopping point of the other straight pipe section is C4, the marked bending stopping point is B, the end point is C5, and the intersection point of the axes of the two straight pipe sections is C3; the bending angle is then:

α= atan((Y1-Y2)/(X2-X1))

the coordinate value of the intersection point between the center line of the

auxiliary blocks

41, 42 and the axis of the corresponding straight pipe section is:

A1（AX1= X1-SIN(α)(F/2+D/2)，AY1=Y1-COS(α)(F/2+D/2)）

A2（AX2=X2-SIN(α)(F/2+D/2) ，AY2=Y2-COS(α)(F/2+D/2)）

the coordinate values of C1, C2 and C3 are as follows:

C1（XC1=AX1-COS(α)(F/2+S1)，YC1=YX+SIN(α)(F/2+S1)）

C2（XC2=AX2+COS(α)F/2，YC2=AY2-SIN(α)F/2）

C3（XC3=AX2+(AY2-YC3)/TAN(α)，YC3=Y3-(F/2+D/2)）

the two tube point lengths L1, L2 are:

L1=((XC1-XC3)^2+(YC1-YC3)^2)^0.5

L2=X4-XC3+F/2+S2

the distance between the theoretical bending stop point C4 and the marked bending stop point B is

AB =((XC2-XC3)^2+(YC2-YC3)^2)^0.5-(X3-XC3-F/2)

In the measuring method of the bent pipe, in the step B, if the tail end of the straight pipe section of the bent pipe is located within the range of the measuring platform, the side edge of the auxiliary block at the corresponding position is aligned with the tail end of the straight pipe section, as shown in the auxiliary block 41 in fig. 5; if the end of the straight pipe section of the elbow pipe exceeds the range of the measuring platform, the auxiliary block at the corresponding position is placed at the edge which is as close to the measuring platform as possible, such as the auxiliary block 44 in fig. 5. This can reduce the distance between the auxiliary block 44 and the end of the straight section, obtain a longer measurement baseline, and improve the measurement accuracy.

Claims

1. A bent pipe measuring device is characterized in that: comprises a measuring platform (1) for placing a pipe to be measured, wherein a transverse reference plate (2) and a longitudinal reference plate (3) which are vertical to each other are arranged on the measuring platform; and the other four auxiliary blocks (4) are placed on the measuring platform and are abutted against the outer side surface of the pipe.

2. The elbow measurement device according to claim 1, wherein: the heights of the transverse reference plate (2), the longitudinal reference plate (3) and the auxiliary block (4) are consistent.

3. The elbow measuring apparatus according to claim 1 or 2, characterized in that: the auxiliary block (4) is a square body with a square cross section, and the center of the top surface of the auxiliary block is marked with an auxiliary mark (5).