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CN-121995042-A - Device and method for testing cracking resistance of fireproof coating

CN121995042ACN 121995042 ACN121995042 ACN 121995042ACN-121995042-A

Abstract

The invention relates to the technical field of coating detection, in particular to a device for testing the cracking resistance of a fireproof coating, which comprises a test box body, wherein mounting plates are arranged on two opposite side walls in the test box body, a test piece is rotatably connected between the two mounting plates, a motor is fixed on the side wall of the test box body, an output shaft of the motor stretches into the test box body and is fixedly connected with one end of the test piece, the test piece comprises a first bending plate and a second bending plate which are fixedly connected, two ends of the first bending plate and the second bending plate are fixedly connected, positioning plates are fixedly connected at the two ends of the first bending plate and the second bending plate, rotating shafts are respectively fixed at one sides, away from each other, of the two positioning plates, and the test piece is rotatably connected between the mounting plates through the rotating shafts. According to the invention, through the test piece arrangement and the test method, the problem that corners cannot be detected in the fireproof coating performance test in the prior art is solved, the function of testing various angles by one test is realized, and the perfection of the fireproof coating cracking resistance detection is improved.

Inventors

  • LI XIAOWEI
  • WANG NING
  • ZHANG MENG
  • Fan Zhishuai
  • DUAN YONGFENG
  • GUO TAO

Assignees

  • 中国石油化工股份有限公司
  • 中石化炼化工程（集团）股份有限公司

Dates

Publication Date
20260508
Application Date
20241107

Claims (10)

  1. 1. The device for testing the anti-cracking performance of the fireproof coating comprises a testing box body (100), and is characterized in that a cover body is arranged on the upper cover of the testing box body (100), mounting plates (200) are mounted on two opposite side walls of the testing box body (100), a test piece (300) is rotatably connected between the two mounting plates (200), a motor (400) is fixed on the side wall of the testing box body (100), an output shaft of the motor (400) stretches into the testing box body (100) and is fixedly connected with one end of the test piece (300), and ventilation openings (110) are formed in the testing box body (100) positioned on two sides of the test piece (300); The test piece (300) comprises a first bending plate (310) and a second bending plate (320), wherein the first bending plate (310) is fixedly connected with the second bending plate (320), positioning plates (330) are fixedly connected to the two ends of the first bending plate (310) and the two ends of the second bending plate (320) after the first bending plate and the second bending plate are fixedly connected, rotating shafts (340) are respectively fixed to one sides, away from each other, of the two positioning plates (330), and the test piece (300) is rotatably connected between the mounting plates (200) through the rotating shafts (340).
  2. 2. The device for testing the cracking resistance of the fireproof coating according to claim 1, wherein the first bending plate (310) comprises a first bottom plate (311), a plurality of first inclined plates (312) formed by bending the first bottom plate (311) in a blocking manner, a plurality of first top plates (313) formed by bending one ends of the first inclined plates (312) far away from the first bottom plate (311), the plurality of first top plates (313) are identical in height, two adjacent first top plates (313) are fixedly connected with each other, the first bottom plate (311) is arranged in parallel with the first top plates (313), the second bending plate (320) comprises a second bottom plate (321), a plurality of second inclined plates (322) formed by bending the second bottom plate (321) in a blocking manner, and a plurality of second top plates (323) formed by bending one ends of the second inclined plates (322) far away from the second bottom plate (321), the plurality of second top plates (323) are identical in height, and the two adjacent second top plates (321) are fixedly connected with each other.
  3. 3. The device for testing the cracking resistance of the fireproof coating according to claim 2, wherein the bending direction of the first inclined plate (312) and the bending direction of the first top plate (313) are opposite, the bending direction of the second inclined plate (322) and the bending direction of the second top plate (323) are opposite, and the height between the first bottom plate (311) and the first top plate (313) and the height between the second bottom plate (321) and the second top plate (323) are equal.
  4. 4. The device for testing the cracking resistance of the fireproof coating according to claim 2, wherein one side of the first top plate (313) away from the first inclined plate (312) is fixedly connected with one side of the second top plate (323) away from the second inclined plate (322).
  5. 5. The device for testing the cracking resistance of the fireproof coating according to claim 2, wherein the included angles between the first bottom plate (311) and the plurality of first inclined plates (312) are alpha, the alpha is 0-180 degrees, the angles of the alpha are different, the included angles between the second bottom plate (321) and the plurality of second inclined plates (322) are beta, the beta is 0-180 degrees, and the angles of the beta are different.
  6. 6. The device for testing the cracking resistance of a fireproof coating according to claim 5, wherein the included angles between the first inclined plates (312) and the first top surface (313) are all gamma, the gamma is 180-360 degrees, the included angles between the second inclined plates (322) and the second top surface (323) are all delta, and the delta is 180-360 degrees.
  7. 7. A device for testing the cracking resistance of a fireproof coating according to claim 5, wherein the angle of each α is different from the angle of each β.
  8. 8. The method for testing the cracking resistance of the fireproof coating comprises the following steps of: S1, performing sand blasting on the surface of a test piece (300) to remove surface impurities; s2, performing primer coating on the test piece (300); S3, after the primer is dried, coating a fireproof coating on the surface of the test piece (300), immediately placing the test piece into the test box body (100) for fixing, covering the test box body, and driving the test piece (300) to rotate by the driving motor (400); And S4, after the test piece is completely dried, ending the test.
  9. 9. The method for testing the cracking resistance of the fireproof coating according to claim 8, wherein in S2, primer coating is carried out on the test piece (300) within 2-5 hours after impurities on the surface of the test piece are removed.
  10. 10. The method for testing the cracking resistance of the fireproof coating according to claim 8, wherein in S3, the initial rotation speed of the test piece (300) is 80-100r/min, the rotation speed is adjusted to 40-50 r/min after the test piece is operated for 30-40 min, and the test piece is operated for 2-4 hours.

Description

Device and method for testing cracking resistance of fireproof coating Technical Field The invention relates to the technical field of coating detection, in particular to a device and a method for testing cracking resistance of a fireproof coating. Background The production process of the refining enterprise device involves a large amount of inflammable, explosive and corrosive substances, and has complex process and high risk. Once a fire happens, the fire spreads rapidly, the difficulty of putting out the fire is great, and serious accidents are easily caused. Therefore, the fire protection work of chemical plants must be performed to prevent the fire, and ensure good fire resistance of production equipment, pipelines and structures. The fireproof paint is one kind of special paint for preventing flame spread and prolonging the fireproof time of base material. The fireproof coating applied to the steel structure can effectively improve the fireproof limit, delay the fire spreading speed and fight for valuable time for fire extinguishment and personnel evacuation. In the field practical application process, the fireproof coating of the steel structure often has local cracking, so that water enters, and the problems of peeling of the fireproof coating, corrosion under a fireproof layer and the like are caused when the water enters seriously. For this reason, it is particularly necessary to evaluate the cracking resistance of the fireproof coating. At present, the national standard GB/T14007-2018 'fireproof paint for steel structures' puts forward a requirement on the initial drying crack resistance of the fireproof paint, wherein the content of the aspects such as a specific test piece, a test method and result evaluation is specified, the test piece adopted in the method is a 300 mm-150 mm-6 mm flat-plate test piece, and only the crack resistance of the fireproof paint under the plane condition is examined. However, steel structural fire-resistant coatings exist at a large number of corners during field service, and the cracking resistance requirements for the fire-resistant coatings at the corners are not addressed. The field investigation finds that the fireproof coating is cracked at corners such as internal corners and external corners at first, so that the evaluation of the cracking resistance of the fireproof coating at the corners is particularly necessary, and no relevant standard test method can be referred at present. The device for detecting the fireproof paint is mainly used for evaluating the fireproof performance of the fireproof paint in the specification of CN202121554007.X, and a device for testing the adhesive strength of the fireproof paint is mainly used for evaluating the adhesive performance of the fireproof paint in the specification of CN202220510236. X. However, the above-mentioned patent is not related to the cracking resistance of the fireproof coating, so it is needed to form a test method for evaluating the cracking resistance of the corner portion of the fireproof coating. Disclosure of Invention Aiming at the defects of the prior art, the invention aims to provide a device and a method for testing the cracking resistance of a fireproof coating, which solve the problem that corners cannot be detected in the performance test of the fireproof coating in the prior art by arranging test pieces and testing the test methods, realize the function of testing various angles by one-time test and improve the detection perfection of the cracking resistance of the fireproof coating. In order to achieve the above object, the present invention provides the following technical solutions: The invention claims protection of a fireproof coating cracking resistance testing device, which comprises a testing box body, wherein a cover body is arranged on the upper cover of the testing box body, mounting plates are arranged on two opposite side walls in the testing box body, a test piece is rotationally connected between the two mounting plates, a motor is fixed on the side wall of the testing box body, an output shaft of the motor stretches into the testing box body to be fixedly connected with one end of the test piece, and ventilation openings are arranged on the testing box bodies positioned on two sides of the test piece; The test piece comprises a first bending plate and a second bending plate, wherein the first bending plate is fixedly connected with the second bending plate, positioning plates are fixedly connected to the two ends of the first bending plate and the second bending plate after the first bending plate is fixedly connected with the second bending plate, rotating shafts are fixed to one sides, away from each other, of the two positioning plates, and the test piece is rotatably connected between the mounting plates through the rotating shafts. Preferably, the first bending plate comprises a first bottom plate, a plurality of first inclined plates formed by bending the first bottom