Pipe ring stiffness / flattening test point alignment device

Abstract

The utility model discloses a pipe ring stiffness / flattening test point alignment device, which comprises a shell, laser sighting devices, a position correction pointer and an adsorption surface, the fingertip of the position correction pointer is flush with the adsorption surface, and a certain included angle is formed between the emission directions of emission heads of a plurality of sighting devices in a radial shape. The device adopts a mode of rotating a test piece, so that a marking point coincides with a light ray with a fixed angle to quickly reach a specified position required by a standard, the operation process is simple and efficient, and the device is light, handy, convenient and wide in application range.

Description

Technical Field

[0001] The utility model relates to the technical field of test alignment devices, in particular to a tube ring stiffness / flattening test point alignment device. Background Art

[0002] The national testing standards have clear provisions for the placement of ring stiffness / flattening test specimens.

[0003] Ring stiffness (ring bending stiffness) refers to the ability of polymer or polymer composite pipes (such as PE pipes, steel wire skeleton PE plastic composite pipes, HDPE double-wall corrugated pipes, etc.) to resist external pressure loads. When conducting a ring stiffness test, the specimen must comply with Article 8.2 of GB / T 9647-2015 "Determination of Ring Stiffness of Thermoplastic Pipes". "When placing the first specimen a, its marking line should be in contact with the upper plate. In the load device, the placement positions of the other two specimens b and c should be rotated 120° and 240° respectively relative to the first specimen.

[0004] When conducting the flattening test, place the sample between two parallel plates and use a press or other methods to evenly press it to the flattening distance specified in the relevant technical conditions (expressed in millimeters using the flattening distance of the outer wall or the inner wall of the pipe). Check the bending and deformation of the sample. If there are no cracks, cracks or weld cracks, it is considered qualified. Article 7.7.2 of CJ / T 120-2016 "Plastic-coated Composite Steel Pipe for Water Supply" stipulates that "the weld of the plastic-coated steel pipe is perpendicular to the compression direction when flattened"; Article 8.5.2 of CJ / T 192-2017 "Lined Stainless Steel Composite Steel Pipe" stipulates that "the weld of the specimen should be located at 90° to the direction of force"; Article 5.6.1 of GB / T32958-2016 "Stainless Steel Composite Steel Pipe for Fluid Transportation" stipulates that "the weld is perpendicular to the load direction"; Article 6.3 of GB / T246-2017 "Stainless Steel Pipe Flattening Test Standard": The weld of the welded pipe should be placed in the position specified by the relevant product standards.

[0005] At present, in order to achieve the placement of the test piece in accordance with the standard requirements, there is a lack of professional tools and devices. Due to the different outer diameters of the test pieces and the different angles relative to the initial point, many auxiliary tools are used during the test. Sometimes, because the outer diameter of the test piece is too large or too small, the commonly used rulers, angle rulers, and levels cannot meet the requirements, which brings too much inconvenience to the actual operation, takes up a lot of valuable time of tools and testers, and also reduces the efficiency of the use of testing equipment. This utility model patent proposes a solution to the above problems. Utility Model Content

[0006] The utility model aims to provide a pipe ring stiffness / flattening test point alignment device in view of the above problems, which solves the problems of lack of professional tools and inconvenient operation in the prior art.

[0007] The utility model is realized by the following scheme:

[0008] A pipe ring stiffness / flattening test point alignment device comprises a shell, a plurality of aiming transmitter heads are arranged on the top of the shell, a calibration pointer is arranged at the bottom of the aiming transmitter head, the fingertip is vertically downward, the bottom surface of the shell is an adsorption surface, the tip of the calibration pointer is flush with the adsorption surface, the aiming transmitter head faces the outside of the shell with the tip of the calibration pointer as the center, and the emission directions of the plurality of aiming transmitter heads are radially arranged with a certain angle between them.

[0009] Furthermore, the multiple sight transmitting heads include a first sight transmitting head, a second sight transmitting head, and a third sight transmitting head; the first sight transmitting head is between the second sight transmitting head and the third sight transmitting head, the first sight transmitting head is vertically oriented and coaxial with the calibration pointer, and the second sight transmitting head and the third sight transmitting head are arranged opposite to each other.

[0010] Furthermore, the horizontal angles between the angles of the second sight transmitting head and the third sight transmitting head and the vertical line where the calibration pointer is located are fixed and unchanged.

[0011] Furthermore, the angle between the aiming device launch heads ranges from 30° to 90°.

[0012] Furthermore, the aiming device launch head can adjust the tilt angle forward and backward.

[0013] Furthermore, the inclination angle ranges from 3° to 6°.

[0014] Furthermore, the front and back sides of the shell form unobstructed gaps relative to the position of the calibration pointer.

[0015] Furthermore, the aiming device transmitting head can be adjusted at multiple angles.

[0016] Furthermore, it also includes a sight switch, which is connected to the sight transmitting head.

[0017] Furthermore, an adsorption switch is also provided on the shell, and the adsorption switch is connected to the adsorption surface to control the adsorption state of the adsorption surface.

[0018] In summary, due to the adoption of the above technical solution, the beneficial effects of the utility model are:

[0019] 1. The device is small in size, light and convenient, low in cost and has a wide range of applications.

[0020] 2. By coinciding the marking point with the fixed angle light, the test piece can be directly rotated to quickly reach the specified position required by the standard. The operation process is simple and efficient, and complies with the standard testing regulations. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the structure of the utility model;

[0022] Figure 2 It is a schematic diagram of the mathematical principle of the ring stiffness test point alignment of the utility model;

[0023] Figure 3 This is a schematic diagram of relative rotation angle point alignment for the ring stiffness test of the utility model;

[0024] Figure 4 This is a schematic diagram of the alignment of the weld points in the flattening test of the utility model;

[0025] Reference numerals:

[0026] 1-housing, 2-calibration pointer, 3-sighting transmitter head, 301-first sighting transmitter head, 302-second sighting transmitter head, 303-third sighting transmitter head, 4-sighting switch, 5-adsorption surface, 6-adsorption switch, 7-test piece, 8-upper pressure plate, 9-lower pressure plate, 10-marking point, 11-welding seam; DETAILED DESCRIPTION

[0027] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0028] Any feature disclosed in this specification (including any additional claims and abstract), unless otherwise stated, may be replaced by other alternative features that are equivalent or have similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0029] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0030] In addition, the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first", "second", etc. may explicitly or implicitly include one or more of the features.

[0031] Embodiment 1:

[0032] like Figure 1 As shown, a pipe ring stiffness / flattening test point alignment device is provided, and the alignment device is preferably in the shape of a box body, including three laser sights and a calibration pointer 2. The calibration pointer 2 is located in the middle of the box body, with the finger tip pointing vertically downward relative to the bottom surface of the shell body. The bottom of the alignment device is an adsorption surface 5, which can be a magnetic surface as an example. The magnetic switch is connected to the magnetic surface and is arranged on the side of the box body. The bottom is hollow in the area relative to the calibration pointer 2, and the front and back of the box body form openings in the area relative to the needle tip of the calibration pointer 2. As an example, they can be fan-shaped openings to facilitate viewing whether the calibration pointer 2 coincides with the test piece 7; the needle tip of the calibration pointer 2 can contact the pressure plate, and the adsorption surface 5 at the bottom of the alignment device is also the contact surface with the pressure plate, so the adsorption surface 5 is flush with the needle tip. The transmitter head of the laser sight is arranged on the top of the alignment device, above the calibration pointer 2, and the switch of the laser sight is connected to the transmitter head and arranged on the front side of the box body. The three switches correspond to the three laser sights for control.

[0033] The three laser sights include a first sight transmitter head 301, a second sight transmitter head 302, and a third sight transmitter head 303; the first sight transmitter head 301 is between the second sight transmitter head 302 and the third sight transmitter head 303, the first sight transmitter head 301 is coaxial with the calibration pointer 2, and the direction is vertically outward relative to the top surface of the shell, and the directions of the second sight transmitter head 302 and the third sight transmitter head 303 are radially outward with the needle tip of the calibration pointer 2 as the center point. As an example, the horizontal angle between the second sight transmitter head 302 and the third sight transmitter head 303 and the vertical line of the first sight transmitter head 301 is fixed at 30°. So if Figure 2 As shown, the angle between the second aimer transmitting head 3 and the third aimer transmitting head 303 forms 60°, so that the marking point 10 and the contact points of the two light rays with the test piece 7 divide the tube annular surface into three equal parts, that is, the internal angle is divided into 120°.

[0034] The alignment device can be adsorbed on the upper pressing plate 8 or the lower pressing plate 9. When the contact point calibration pointer 2 is horizontally overlapped with the marking point 10 of the pipe test piece 7, since the alignment device has a certain thickness, when the test piece 7 is against the alignment device, the light emitted by the transmitter is still at a certain distance from the test piece 7 in the longitudinal direction, that is, the light will not directly intersect with the test piece 7. Therefore, the aiming device transmitting head 3 can be moved forward and backward, that is, the end of the aiming device transmitting head 3 that contacts the shell 1 does not move, ensuring that the horizontal angle does not change in the horizontal direction, and the end away from the shell 1 can be adjusted in the longitudinal front-to-back direction. The tilt angle can be adjusted so that the light can coincide with the marking point 10 of the test piece 7. Preferably, the longitudinal tilt angle is 3° to 6°.

[0035] When in use, align the marking point 10 of the test piece 7 with the calibration pointer 2, turn on the magnetic attraction, adsorb the device on the upper pressure plate 8 of the testing machine, press the laser aimer switch 4 to emit infrared rays, and move the emission head inward so that the light can intersect with the edge of the pipe test piece 7.

[0036] Based on the above structure, it is only necessary to mark a point on a single test piece 7, and to horizontally overlap the contact point of the calibration pointer 2 with the mark point 10 of the pipe test piece 7 to perform the first load test; then the test piece 7 is rotated so that the mark point 10 is rotated to overlap the light of the second aimer transmitting head 302. Figure 3 As shown, when the marking point 10 reaches B, the rotation angle reaches 120°, and the second load test is carried out; then the test piece 7 continues to be rotated until the marking point 10 is rotated to coincide with the light of the third aimer transmitter 303, and the marking point 10 reaches C, the rotation angle reaches 240°, and the third load test is carried out. In this way, the test piece 7 is pressed three times to meet the standard requirements of rotating 120° and 240° in sequence, and the standard test is completed.

[0037] Example 2

[0038] It is roughly the same as the above embodiment, except that the alignment device can also be used for load tests of multiple specimens. The pipe specimen 7 is a long tube, and a long line is drawn and marked along the long axis at one time. After cutting, multiple specimens are formed. The first specimen makes the marking point 10 coincide with the calibration pointer 2 for load test, the second specimen rotates the angle to coincide with the marking point 10 and the light of the second sighting device transmitting head 302, and then the load test is carried out, and the third specimen rotates the angle to coincide with the marking point 10 and the light of the third sighting device transmitting head 303, and then the load test is carried out; all of the above reach the specified measurement angle for pressure measurement, completing the standard test.

[0039] Example 3

[0040] It is substantially the same as the above embodiment, except that the alignment device is adsorbed on the lower pressure plate 9, and the horizontal angle between the second sighting head 302 and the third sighting head 303 and the vertical line of the first sighting head 301 is fixed at 45°. Figure 4 As shown, the light is made to coincide with the weld 11, and then a flattening test is carried out. Based on the above structure, the standard requirements such as "the weld of the plastic-coated steel pipe is perpendicular to the compression direction when flattened", "the weld of the specimen should be located at 90° to the direction of force applied", and "the weld is perpendicular to the load direction" can be achieved to complete the standard test.

[0041] Example 4

[0042] It is roughly the same as the above embodiment, except that the box body can be made of transparent material, and there are no openings on the front and back, so that it is possible to directly observe the overlap state of the calibration pointer 2 and the test piece 7; the magnetic switch and the magnetic surface can be replaced by other structures that can play a role of repeated attachment.

[0043] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A pipe ring stiffness / flattening test point alignment device, characterized in that: The invention comprises a shell (1), wherein a plurality of sighting transmitter heads (3) are arranged on the top of the shell (1), a calibration pointer (2) is arranged at the bottom of the sighting transmitter head (3), the tip of which points vertically downward, the bottom surface of the shell (1) is an adsorption surface (5), the tip of the calibration pointer (2) is flush with the adsorption surface (5), the direction of the sighting transmitter head (3) points to the outside of the shell (1) with the tip of the calibration pointer (2) as the center, and the emission directions of the plurality of sighting transmitter heads (3) are radially arranged with a certain angle between them.

2. A pipe ring stiffness / flattening test point alignment device as claimed in claim 1, characterized in that: The plurality of sight transmitting heads (3) include a first sight transmitting head (301), a second sight transmitting head (302), and a third sight transmitting head (303); the first sight transmitting head (301) is between the second sight transmitting head (302) and the third sight transmitting head (303); the first sight transmitting head (301) is vertically oriented and coaxial with the calibration pointer (2); the second sight transmitting head (302) and the third sight transmitting head (303) are arranged opposite to each other.

3. A pipe ring stiffness / flattening test point alignment device as claimed in claim 2, characterized in that: The included angles between the second sighting device transmitting head (302) and the third sighting device transmitting head (303) and the vertical line where the calibration pointer (2) is located are fixed and unchanged.

4. A pipe ring stiffness / flattening test point alignment device as claimed in claim 1, 2 or 3, characterized in that: The angle between the aiming device transmitting heads (3) ranges from 30° to 90°.

5. A pipe ring stiffness / flattening test point alignment device as claimed in claim 3, characterized in that: The aiming device transmitting head (3) can adjust the front and rear tilt angles.

6. A pipe ring stiffness / flattening test point alignment device as claimed in claim 5, characterized in that: The inclination angle ranges from 3° to 6°.

7. A pipe ring stiffness / flattening test point alignment device as claimed in claim 1, characterized in that: The front and back sides of the housing (1) form unobstructed gaps relative to the position of the calibration pointer (2).

8. A pipe ring stiffness / flattening test point alignment device as claimed in claim 1, characterized in that: The aiming device transmitting head (3) can be adjusted at multiple angles.

9. A pipe ring stiffness / flattening test point alignment device as claimed in claim 1, characterized in that: It also comprises a sight switch (4), wherein the sight switch (4) is connected to the sight transmitting head (3).

10. A pipe ring stiffness / flattening test point alignment device as claimed in claim 1, characterized in that: The housing (1) is also provided with an adsorption switch (6), which is connected to the adsorption surface (5) to control the adsorption state of the adsorption surface (5).

Images