CN215415237U

CN215415237U - Special test block for detecting adhesive state of rubber-lined pipeline

Info

Publication number: CN215415237U
Application number: CN202121979616.XU
Authority: CN
Inventors: 贺锡鹏; 张喜; 王飞; 李旭; 马博伦; 王兆亮
Original assignee: Xian Thermal Power Research Institute Co Ltd
Current assignee: Xian Thermal Power Research Institute Co Ltd
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2022-01-04
Anticipated expiration: 2031-08-20

Abstract

The utility model discloses a special test block for detecting the bonding state of a rubber-lined pipeline, belonging to the field of nondestructive detection. The special test block belongs to a necessary device for the detection technology of the bonding state of the rubber-lined pipeline, is used for debugging instrument and calibrating detection sensitivity, and is designed into series of test blocks with different specifications and sizes, such as RLP-A, RLP-B, RLP-C and the like aiming at different specifications of detection objects.

Description

Special test block for detecting adhesive state of rubber-lined pipeline

Technical Field

The utility model belongs to the technical field of nondestructive testing, and particularly relates to a special test block for detecting the bonding state of a rubber-lined pipeline.

Background

The carbon steel material of partial pipelines of power plants and chemical plants has weaker corrosion resistance, and in order to prevent the medium in the pipelines from corroding the metal pipelines, lining rubber is generally adopted as an anticorrosive material, and once the lining rubber is damaged, the internal medium quickly corrodes the metal to cause pipeline leakage. According to the existing detection means, the rubber-lined pipe is mainly detected by visual inspection and knocking inspection of accessible parts after the pipe is partially disassembled, the detection modes cannot prevent the failure of the rubber-lined pipe in advance, and the detection has great limitation.

SUMMERY OF THE UTILITY MODEL

The utility model aims to provide a special test block for detecting the bonding state of a rubber-lined pipeline, which is used for debugging instrument and calibrating detection sensitivity when the bonding state of the rubber-lined pipeline is detected by adopting an ultrasonic technology, and meets the detection requirement.

The utility model is realized by adopting the following technical scheme:

a special test block for detecting the bonding state of a rubber-lined pipeline comprises a test block body, wherein the top surface of the test block body is in a step shape, and rubber is adhered to the bottom surface of the test block body.

The utility model is further improved in that the material of the rubber is chloroprene.

The utility model is further improved in that the material of the test block body is 20 steel.

The utility model is further improved in that the stepped top surface of the test block body is gradually increased or decreased.

The utility model has the further improvement that the step-shaped top surface of the test block body is provided with a curved surface.

The utility model is further improved in that the bottom surface of the test block body is divided into an area A and an area B with the same size in the width direction, and rubber is adhered to the area A.

The utility model has the further improvement that the stepped top surface of the test block body is gradually reduced from the center to two sides, and the stepped top surface is provided with a curved surface.

The utility model is further improved in that the bottom surface of the test block body is divided into an area A and an area B with the same size in the length direction, and rubber is adhered to the area A.

The utility model has at least the following beneficial technical effects:

the utility model provides a special test block for detecting the bonding state of a rubber-lined pipeline. The test blocks are three series of RLP-A, RLP-B, RLP-C, the structure is a ladder type test block with gradually changed thickness, and each group of test blocks is divided into rubber-lined parts and rubber-unlined parts. The two series of test blocks are test blocks with different curvatures, the three series of test blocks basically cover rubber-lined pipelines involved in daily production, the problem of ultrasonic detection of the rubber-lined test blocks of pipelines made of carbon steel is solved by the aid of the test blocks, and reference is provided for detection results of whether the rubber lining is complete or not. Make up the vacancy in the aspect of ultrasonic detection of the rubber-lined pipeline.

Drawings

FIG. 1 is ｃA schematic diagram of the structure of RLP-A series special test blocks of the present invention.

Fig. 2 is a top view of fig. 1.

Fig. 3 is a side view of fig. 1.

FIG. 4 is a schematic diagram of the structure of the RLP-B series dedicated test block of the present invention.

Fig. 5 is a top view of fig. 4.

Fig. 6 is a side view of fig. 4.

FIG. 7 is a schematic diagram of the structure of the RLP-C series dedicated test block of the present invention.

Fig. 8 is a top view of fig. 7.

Fig. 9 is a side view of fig. 7.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The ultrasonic technology detection principle of the bonding state of the rubber-lined pipeline is as follows: when sound waves are emitted to the steel-rubber combined surface from the steel plate direction, most energy is reflected to the steel plate, and a small part of energy enters the rubber layer; and only there is steel plate, when there is not another kind of medium in the junction, the sound wave will be totally reflected, the energy is very little to be lost, through calculating, after every sound wave is reflected by the faying face, about 10% of the energy enters the rubber layer and is lost, compared with the reflected sound wave without rubber layer, the wave amplitude difference is limited, but through reflecting many times, through the loss more than 5 times, the reflected wave amplitude of the rubber faying face and reflected wave amplitude without rubber will appear very obvious difference, through the observation to the reflected wave amplitude more than 5 times, can judge whether the reflecting bottom surface is laminated with rubber. In order to accurately describe and distinguish the difference of reflected wave amplitudes between good bonding and bonding failure of a rubber bonding surface, a special test block for process calibration is made, and the test block is mainly divided into two areas: the device comprises an area A (good bonding of a rubber bonding surface) and an area B (no bonding of rubber), wherein in the process of process setting, an instrument simulates and records the wave amplitude condition when the bonding state of the rubber-lined pipeline with the actual corresponding specification is good through the detection of the bonding position of the rubber bonding surface of the special test block, and then simulates and records the wave amplitude condition when the actual rubber-lined pipe has the conditions of rubber falling, bonding failure and the like through the detection of the bonding position of the special test block, and the two conditions are used as reference standards to detect and contrastively analyze the actual rubber-lined pipeline, so that whether the bonding state of the rubber-lined pipeline is good or not.

The special test block for detecting the bonding state of the rubber-lined pipeline is suitable for a detection method of the bonding state of the rubber-lined pipeline based on an ultrasonic technology, and the step test block and the rubber bonding surface in the test block are manufactured according to an actual rubber vulcanization lining process. Each type of test block is divided into A, B areas, wherein A corresponds to a good rubber bonding surface bonding area and a B area has no rubber bonding area; the test block structure comprises a step test block (20 steel), a step test block and rubber bonding surface and rubber (chloroprene), wherein the thickness of each step of the step test block is designed according to the actual rubber lining pipe wall thickness, and the bonding surface and the rubber confirm the manufacturing process according to the actual rubber lining process and material.

The special test blocks for detecting the bonding state of the rubber-lined pipelines are divided into three types of RLP-A, RLP-B, RLP-C.

As shown in fig. 1 to 3, RLP- ｃA block: the thickness of the 20 steel step test block is respectively 10mm, 12mm, 16mm and 20mm, the length and width of each step of the test block is 50mm multiplied by 80mm, and the length and width of the rubber adhered to the bottom of the test block is 200mm multiplied by 40 mm; the rubber lining pipe with the outer diameter larger than or equal to 500mm and the rubber lining plate with the thickness of 10 mm-20 mm are suitable for detection.

As shown in fig. 4 to 6, RLP-B series test block: three standard test blocks are designed, the thickness of each 20-steel curved surface step test block is 8mm, 10mm, 12mm and 16mm, the curvature of the curved surface is shown in table 1, the length and width of each step of the test block are 50mm multiplied by 80mm, and the length and width of rubber adhered to the bottom of the test block are 200mm multiplied by 40 mm; the method is suitable for detecting the rubber-lined pipeline with the outer diameter of more than 159mm and less than 500 mm.

TABLE 1 RLP-B series of test blocks

As shown in fig. 7 to 8, RLP-C series test block: two groups of six standard test blocks are designed.

The thickness of the I group of 20 steel curved surface ladder test blocks is respectively 3mm, 5mm and 8mm, the curvature of the curved surface is shown in the table 2, the length and the width of each ladder of the test blocks are 30mm multiplied by 25mm, and the length and the width of the rubber adhered to the bottom of the test block are 90mm multiplied by 25 mm; the rubber lining pipeline with the outer diameter larger than or equal to 50mm and smaller than or equal to 90mm is suitable for detection.

TABLE 2 RLP-C SERIES I-GROUP TEST BLOCKS

The thickness of 20 steel curved surface ladder test blocks in group II is respectively 5mm, 8mm and 10mm, the curvature of the curved surface is shown in table 2, the length and width of each ladder of the test blocks is 30mm multiplied by 25mm, and the length and width of rubber adhered to the bottoms of the test blocks is 90mm multiplied by 25 mm; the method is suitable for detecting the rubber-lined pipeline with the outer diameter larger than 90mm and smaller than or equal to 159 mm.

TABLE 3 RLP-C series II test blocks

It will be apparent to those skilled in the art that various modifications and variations can be made in the embodiments of the present invention without departing from the spirit or scope of the embodiments of the utility model. Thus, if such modifications and variations of the embodiments of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to encompass such modifications and variations.

Claims

1. A special test block for detecting the bonding state of a rubber-lined pipeline is characterized by comprising a test block body, wherein the top surface of the test block body is in a step shape, and rubber is adhered to the bottom surface of the test block body.

2. The special test block for detecting the bonding state of the rubber-lined pipeline according to claim 1, wherein the rubber is chloroprene rubber.

3. The special test block for detecting the bonding state of the rubber-lined pipeline according to claim 1, wherein the material of the test block body is 20 steel.

4. The special test block for detecting the bonding state of the rubber-lined pipeline according to claim 1, wherein the stepped top surface of the test block body is gradually increased or decreased.

5. The special test block for detecting the bonding state of the rubber-lined pipeline as claimed in claim 4, wherein the stepped top surface of the test block body is provided with a curved surface.

6. The special test block for detecting the bonding state of the rubber-lined pipeline according to claim 4 or 5, wherein the bottom surface of the test block body is divided into an area A and an area B with the same size in the width direction, and rubber is adhered to the area A.

7. The special test block for detecting the bonding state of the rubber-lined pipeline according to claim 1, wherein the stepped top surface of the test block body is gradually decreased from the center to two sides, and the stepped top surface is provided with a curved surface.

8. The special test block for detecting the bonding state of the rubber-lined pipeline as claimed in claim 7, wherein the bottom surface of the test block body is divided into an area A and an area B with the same size in the length direction, and rubber is adhered to the area A.