A device for testing the adhesion of a corrosion protection coating on a corrosion protection pipe

Abstract

The application relates to the technical field of pipeline anticorrosive coating testing, in particular to an anticorrosive pipeline anticorrosive coating adhesion testing device, which comprises a base, the top of the base is provided with a placing table, and the top of the placing table is provided with an adjusting and fixing assembly. The anticorrosive pipeline anticorrosive coating adhesion testing device is provided with a pressing testing assembly, the pressing testing assembly can be used for detection during detection, a steel ball with a proper diameter is selected and installed below a pressing plate, then the pressing plate can be moved downward by holding the holding piece and rotating the screw rod, pressure is slowly applied through a loading mechanism, the steel ball is in contact with the surface of the pipeline anticorrosive coating, and the pressure is gradually increased, in the process of applying pressure, the change of the coating surface is observed, the pressure value when the coating starts to crack, peel or show other damage phenomena is recorded, the pressure value is judged by the depth of downward sliding, and the adhesion data of the coating under different pressure conditions is obtained.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline anticorrosive coating testing, in particular to an anticorrosive pipeline anticorrosive coating adhesion testing device. BACKGROUND

[0002] In the energy and industrial fields of petroleum, natural gas, and chemical industry, anticorrosive pipelines have become the key infrastructure for fluid transportation due to their excellent corrosion resistance. As the core means to protect pipelines and extend their service life, the strength of coating adhesion is directly related to the corrosion resistance and operational safety of the pipeline. Once the coating adhesion is insufficient, the coating may easily peel off or crack, exposing the pipeline substrate and accelerating corrosion, and even causing serious accidents such as leakage.

[0003] The prior art discloses a pull-off method coating adhesion testing fixing device with the publication number CN215218501U. In factory production, the pull-off method adhesion testing needs to keep the aluminum alloy test column still during the curing of the adhesive to avoid affecting the accuracy of the test results. Therefore, for pull-off method adhesion field testing, it is necessary to solve the problem of fixing the aluminum alloy test column during the curing of the adhesive, and there is an urgent need for a fixing device for the aluminum alloy test column. The device includes a strip, a magnet, a test column cover, and an aluminum alloy test column. The magnet is fixedly embedded in the strip. The upper part of the aluminum alloy test column is the test column cover, and the strip is symmetrically distributed and fixedly connected to the two ends of the aluminum alloy test column.

[0004] The above-mentioned anticorrosive pipeline anticorrosive coating adhesion testing device uses a relatively convenient method to efficiently solve the problem of fixation and can be used repeatedly, which has high practical value for factory operations. However, the fixing assembly of the above-mentioned anticorrosive pipeline anticorrosive coating adhesion testing device is arranged in a ring shape, which causes obstruction in the upper half, making it impossible to use pressing to achieve adhesion testing, and unable to understand the adhesion characteristics of the coating under different pressure distributions, resulting in poor evaluation effect. It is necessary to design a practical anticorrosive pipeline anticorrosive coating adhesion testing device. SUMMARY

[0005] The purpose of the present application is to provide an anticorrosive pipeline anticorrosive coating adhesion testing device to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solution: an anticorrosive pipeline anticorrosive coating adhesion testing device, comprising a base, the top of the base is provided with a placing table, the top of the placing table is provided with an adjusting fixing assembly, the top back of the placing table is provided with a pressing testing assembly, and the front of the adjusting fixing assembly is provided with an adjustable amplifying assembly.

[0007] The pressing test assembly includes a placing rack, a connecting block, a holding piece, a screw rod, a transparent observation window, a connecting strip, a scale strip, a pressing plate and a steel ball, the placing rack is fixedly connected to the top back of the base, the connecting block is fixedly connected to the front top of the placing rack, a threaded groove is formed in the inside of the connecting block, the screw rod is threadedly connected to the inside of the connecting block, the holding piece is fixedly connected to the top of the screw rod, the transparent observation window is fixedly connected to the front of the connecting block, the connecting strip is fixedly connected to the right side of the connecting block, the scale strip is fixedly connected to the right side of the connecting strip, the pressing plate is rotationally connected to the bottom of the screw rod, and the steel ball is installed at the bottom of the pressing plate.

[0008] Preferably, the adjusting fixing assembly includes a connecting plate piece, a threaded rod, a holding rod, a placing seat, a supporting bottom piece, a placing air bag piece, an air pump, a conveying air pipe, an anti-skid elastic pad, a limiting seat, a rack, a gear, a connecting rod, a connecting round piece, an elastic thumb strap, a bearing piece and a fixed bottom plate, the connecting plate piece is fixedly connected to the front of the placing rack, a threaded groove hole is formed in the inside of the threaded rod, the threaded rod is threadedly connected to the inside of the connecting plate piece, the holding rod is fixedly connected to the right side of the threaded rod, the placing seat is internally provided with a through groove, the diameter of the through groove is larger than the rod diameter of the threaded rod, the inside right side of the placing air bag piece is provided with a through hole with the same diameter as the through groove, the supporting bottom piece is fixedly connected to the top of the placing table, the placing seat is fixedly connected to the top of the supporting bottom piece, the placing air bag piece is fixedly connected to the top of the placing seat, the air pump is fixedly connected to the front of the placing seat, the conveying air pipe is fixedly connected to the top of the air pump, one end of the conveying air pipe away from the top of the air pump is fixedly connected to the bottom of the placing air bag piece, the anti-skid elastic pad is fixedly connected to the top of the placing air bag piece, the limiting seat is fixedly connected to the top left side of the placing seat, the fixed bottom plate is fixedly connected to the top of the placing seat, the bearing piece is fixedly connected to the top of the fixed bottom plate, the connecting rod is fixedly connected to the inner ring of the bearing piece, the connecting round piece is fixedly connected to the surface of the connecting rod, the elastic thumb strap is fixedly connected to the surface of the connecting round piece, the gear is fixedly connected to the top of the connecting rod, and the gear is engaged with the rack.

[0009] Preferably, the adjustable magnifying assembly includes a holding frame, a connecting frame, an inner placing rod, a stepping motor, a rotating shaft rod, a limiting strip, a connecting plate body, a placing column piece, a magnifying glass, a bottom end connecting block, a scale ring piece, a connecting piece, a magnetic attraction ring, a pointer and a supporting thin rod, the connecting frame is fixedly connected to the front right side of the placing seat, the inner placing rod is fixedly connected to the inner back surface of the connecting frame, the stepping motor is fixedly connected to the front surface of the inner placing rod, the rotating shaft rod is fixedly connected to the output shaft of the stepping motor, the bottom end connecting block is fixedly connected to the surface of the rotating shaft rod, the holding frame is fixedly connected to the inner part of the bottom end connecting block, the limiting strip is fixedly connected to the front surface of the holding frame, the placing column piece is fixedly connected to the inner part of the connecting plate body, the magnifying glass is fixedly connected to the back surface of the placing column piece, the connecting piece is fixedly connected to the top of the rotating shaft rod, the pointer is fixedly connected to the front surface of the rotating shaft rod, and the scale ring piece is fixedly connected to the front surface of the supporting thin rod.

[0010] Preferably, the inner bottom end of the holding frame is provided with a hydraulic telescopic rod, and the connecting plate body is fixedly connected to the top of the hydraulic telescopic rod.

[0011] Preferably, the magnetic attraction ring is slidingly connected to the inner ring of the scale ring piece, and the magnetic attraction ring is magnetically connected to the scale ring piece.

[0012] Preferably, the diameters of the steel balls increase from left to right in sequence, and the steel balls are distributed at equal intervals on the bottom of the pressing plate.

[0013] Preferably, the rack is slidingly connected to the inner part of the limiting seat, the thickness of the rack is matched with the upper and lower end distance of the inner part of the limiting seat, the rack slides in the limiting seat, is limited, and stable sliding of the rack is ensured to help realize clamping.

[0014] Preferably, the connecting plate body is slidingly connected to the mutually close one end of the limiting strip, the hydraulic telescopic rod and the connecting plate body can adjust the height, drive the connecting plate body to ascend and descend, the sliding of the connecting plate body is limited, and the stability of sliding is ensured.

[0015] Preferably, the magnetic attraction ring is fixedly connected to the end, away from the rotating shaft rod, of the connecting piece, and the diameter of the magnetic attraction ring is matched with the inner diameter of the scale ring piece.

[0016] Preferably, the right back surface of the connecting frame is fixedly connected with a supporting plate body, and the supporting thin rod is fixedly connected to the front surface of the supporting plate body.

[0017] Compared with the prior art, the adjustable magnifying assembly has the following beneficial effects:

[0018] 1. The anticorrosive pipeline anticorrosive coating adhesion testing device, by setting up the pressing test assembly, the pressing test assembly can be used for detection during detection, the steel ball with appropriate diameter is selected and installed below the pressing plate, then the screw rod can be driven by holding the holding piece, the pressing plate moves downward, the pressure is slowly applied through the loading mechanism, the steel ball contacts the pipeline anticorrosive coating surface, and the pressure is gradually increased, in the process of applying pressure, the change of the coating surface is observed, the pressure value when the coating starts to crack, peel or other damage phenomenon is recorded, the pressure value is judged by the depth of downward sliding, the above steps are repeated, different diameter steel balls are used for testing to obtain the adhesion data of the coating under different pressure conditions, the adhesion characteristics of the coating under different pressure distribution can be understood, and the quality and performance of the anticorrosive coating are evaluated.

[0019] 2. The anticorrosive pipeline anticorrosive coating adhesion testing device, by setting the adjusting and fixing assembly, the gas pump can be started to cooperate with the delivery pipe to input gas into the inside of the placed air bag piece, extrusion helps to limit the pipeline at the bottom, and the connecting plate piece and the threaded rod are arranged on the right side, the holding rod can be held and then twisted to drive the threaded rod to move left until it penetrates through the placing seat and the placed air bag piece and contacts the right side of the pipeline, and the pressure is fixed, and the limiting seat and the rack limiting assembly are arranged on the top left side of the placed air bag piece, the fingers can be inserted into the inside of the elastic thumb belt during use, the connecting circle piece is rotated to drive the rack meshed therewith to move horizontally close to the left side of the pipeline until the rear end of the rack contacts the left side of the pipeline to realize clamping, and the pipeline can be fixed by cooperating with the clamping assembly on the right side, and the upper half leaks out during clamping, which does not affect the normal adhesion testing.

[0020] 3. The anticorrosive pipeline anticorrosive coating adhesion testing device, by setting the adjustable magnifying assembly, the stepping motor can be started to drive the rotating shaft rod to rotate, the supporting frame can be driven to rotate, the magnifying glass is close to the crack, the angle is adjusted through the stepping motor, the hydraulic telescopic rod and the connecting plate body are arranged to adjust the height, the connecting plate body is driven to rise and fall, and the above structure is arranged to press, the magnifying glass rises and falls with the pressing point, and the magnifying observation of the test area is always maintained, when the crack length reaches the preset value, it can be judged that the coating adhesion is not up to standard, the intuitive observation and result determination are realized, and the adjustable magnifying assembly is arranged to magnify the crack for accurate judgment. BRIEF DESCRIPTION OF DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creating labor intensity.

[0022] Figure 1 It is the overall structure schematic diagram of the application;

[0023] Figure 2 It is the overall structure schematic diagram of the application; Figure 1 It is the enlarged structure schematic diagram of A in the application;

[0024] Figure 3 It is the overall structure schematic diagram of the application;

[0025] Figure 4 It is the overall structure schematic diagram of the application; Figure 3 It is the enlarged structure schematic diagram of B in the application;

[0026] Figure 5 It is the overall structure schematic diagram of the application;

[0027] Figure 6 It is the overall structure schematic diagram of the application;

[0028] Figure 7 It is the overall structure schematic diagram of the application; Figure 6 It is the enlarged structure schematic diagram of C in the application;

[0029] Figure 8 It is the overall structure schematic diagram of the application.

[0030] In the figure: 1, base; 2, placing table; 3, pressing test assembly; 301, placing rack; 302, connecting block; 303, holding piece; 304, screw rod; 305, transparent observation window; 306, connecting strip; 307, scale bar; 308, pressing plate; 309, steel ball; 4, adjusting and fixing assembly; 401, connecting plate piece; 402, threaded rod; 403, holding rod; 404, placing seat; 405, supporting bottom piece; 406, placing air bag piece; 407, air pump; 408, conveying air pipe; 409, anti-skid elastic pad; 410, limiting seat; 411, rack; 412, gear; 413, connecting rod; 414, connecting round piece; 415, elastic thumb strap; 416, bearing piece; 417, fixed bottom plate; 5, adjustable magnifying assembly; 501, bearing rack; 502, connecting frame; 503, inner placing rod; 504, stepping motor; 505, rotating shaft rod; 506, limiting strip; 507, connecting plate body; 508, placing column piece; 509, magnifying glass; 510, bottom end connecting square block; 511, scale ring piece; 512, connecting piece; 513, magnetic attraction ring; 514, pointer; 515, supporting thin rod. DETAILED DESCRIPTION

[0031] Clearly, the embodiments described are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by a person of ordinary skill in the art without creative work shall fall within the protection scope of the present application.

[0032] In the present application, unless specifically defined and limited otherwise, the terms "mounting", "connecting", "connecting", "fixing" and the like should be broadly understood, for example, can be fixed connection, can also be detachable connection, or integrated; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship of two elements. For a person of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Please refer to Figures 1-8 The present application provides the following technical solutions:

[0034] A kind of anticorrosive pipeline anticorrosive coating adhesion testing device, including base 1, the top of base 1 is provided with placing table 2, adjusting fixed component 4 is provided at the top of placing table 2, pressing test component 3 is provided at the top back of placing table 2, the front of adjusting fixed component 4 is provided with adjustable amplification component 5.

[0035] Pressing test component 3 includes placing rack 301, connecting block 302, gripping piece 303, screw rod 304, transparent observation window 305, connecting strip 306, scale bar 307, pressing plate 308 and steel ball 309, placing rack 301 is fixedly connected to the top back of base 1, connecting block 302 is fixedly connected to the top front of placing rack 301, screw groove is formed in the inside of connecting block 302, screw rod 304 is screwedly connected to the inside of connecting block 302, gripping piece 303 is fixedly connected to the top of screw rod 304, transparent observation window 305 is fixedly connected to the front of connecting block 302, connecting strip 306 is fixedly connected to the right side of connecting block 302, scale bar 307 is fixedly connected to the right side of connecting strip 306, pressing plate 308 is rotatably connected to the bottom of screw rod 304, steel ball 309 is installed at the bottom of pressing plate 308, the diameter of steel ball 309 increases gradually from left to right, and steel ball 309 is distributed at the bottom of pressing plate 308 at intervals.

[0036] The adjusting and fixing component 4 comprises a connecting plate 401, a threaded rod 402, a holding rod 403, a placing seat 404, a supporting bottom 405, a placing air bag 406, an air pump 407, a conveying air pipe 408, an anti-skid elastic pad 409, a limiting seat 410, a rack 411, a gear 412, a connecting rod 413, a connecting round 414, an elastic thumb strap 415, a bearing 416 and a fixing bottom plate 417, the connecting plate 401 is fixedly connected to the front face of the placing rack 301, the threaded rod 402 is internally provided with a threaded groove, the threaded rod 402 is threadedly connected to the inside of the connecting plate 401, the holding rod 403 is fixedly connected to the right side of the threaded rod 402, the placing seat 404 is internally provided with a through groove, the diameter of the through groove is larger than the rod diameter of the threaded rod 402, the inside right side of the placing air bag 406 is provided with a through hole with the same diameter as the through groove, the supporting bottom 405 is fixedly connected to the top of the placing table 2, the placing seat 404 is fixedly connected to the top of the supporting bottom 405, the placing air bag 406 is fixedly connected to the top of the placing seat 404, the air pump 407 is fixedly connected to the front face of the placing seat 404, the conveying air pipe 408 is fixedly connected to the top of the air pump 407, one end of the conveying air pipe 408 away from the top of the air pump 407 is fixedly connected to the bottom of the placing air bag 406, the anti-skid elastic pad 409 is fixedly connected to the top of the placing air bag 406, the limiting seat 410 is fixedly connected to the top left side of the placing seat 404, the fixing bottom plate 417 is fixedly connected to the top of the placing seat 404, the bearing 416 is fixedly connected to the top of the fixing bottom plate 417, the connecting rod 413 is fixedly connected to the inner ring of the bearing 416, the connecting round 414 is fixedly connected to the surface of the connecting rod 413, the elastic thumb strap 415 is fixedly connected to the surface of the connecting round 414, the gear 412 is fixedly connected to the top of the connecting rod 413, the gear 412 is engaged with the rack 411, the rack 411 is slidingly connected to the inside of the limiting seat 410, the thickness of the rack 411 is adapted to the upper and lower end distance of the inside of the limiting seat 410, the rack 411 slides in the limiting seat 410, is limited, ensures that the rack 411 stably slides and helps to realize clamping.

[0037] The adjustable amplification assembly 5 comprises a bearing rack 501, a connecting frame 502, an inner placing rod 503, a stepping motor 504, a rotating shaft rod 505, a limiting strip 506, a connecting plate body 507, a placing column 508, a magnifying glass 509, a bottom end connecting block 510, a scale ring 511, a connecting piece 512, a magnetic attraction ring 513, a pointer 514 and a supporting thin rod 515. The connecting frame 502 is fixedly connected to the front right side of the placing seat 404. The inner placing rod 503 is fixedly connected to the inner back surface of the connecting frame 502. The stepping motor 504 is fixedly connected to the front surface of the inner placing rod 503. The rotating shaft rod 505 is fixedly connected to the output shaft of the stepping motor 504. The bottom end connecting block 510 is fixedly connected to the surface of the rotating shaft rod 505. The bearing rack 501 is fixedly connected to the inner portion of the bottom end connecting block 510. The limiting strip 506 is fixedly connected to the front surface of the bearing rack 501. The placing column 508 is fixedly connected to the inner portion of the connecting plate body 507. The magnifying glass 509 is fixedly connected to the back surface of the placing column 508. The connecting piece 512 is fixedly connected to the top of the rotating shaft rod 505. The pointer 514 is fixedly connected to the front surface of the rotating shaft rod 505. The scale ring 511 is fixedly connected to the front surface of the supporting thin rod 515. The right back surface of the connecting frame 502 is fixedly connected with a supporting plate body. The supporting thin rod 515 is fixedly connected to the front surface of the supporting plate body. The inner bottom end of the bearing rack 501 is provided with a hydraulic telescopic rod. The connecting plate body 507 is fixedly connected to the top of the hydraulic telescopic rod. The magnetic attraction ring 513 is slidingly connected to the inner ring of the scale ring 511. The magnetic attraction ring 513 is magnetically attracted to the scale ring 511. The connecting plate body 507 is slidingly connected to the mutually close ends of the limiting strip 506. The hydraulic telescopic rod and the connecting plate body 507 are arranged to adjust the height, drive the connecting plate body 507 to ascend and descend, limit the sliding of the connecting plate body 507, ensure the stability of the sliding, the magnetic attraction ring 513 is fixedly connected to the end of the connecting piece 512 away from the rotating shaft rod 505, and the diameter of the magnetic attraction ring 513 is adapted to the inner diameter of the scale ring 511.

[0038] In use, the pipeline that needs to be tested for adhesion is placed inside the placement air bag member 406 and in contact with the anti-skid elastic pad 409 on the top of the placement air bag member 406, then the inside of the placement air bag member 406 can be adjusted according to the diameter of the pipeline, the air pump 407 can be started to input gas into the inside of the placement air bag member 406 in cooperation with the delivery air pipe 408 to perform extrusion and help position the pipeline at the bottom end, while the connecting plate member 401 and the threaded rod 402 are provided on the right side, the holding rod 403 can be held and twisted to drive the threaded rod 402 to move left until it penetrates through the placement seat 404 and the placement air bag member 406 and contacts the right side of the pipeline to press and fix, while the limiting assembly such as the limiting seat 410 and the rack 411 is also provided on the top left side of the placement air bag member 406, in use, the fingers can be inserted into the inside of the elastic thumb strap 415 to drive the connecting circle 414 to rotate, which can drive the rack 411 engaged therewith to move horizontally close to the left side of the pipeline until the rear end of the rack 411 contacts the left side of the pipeline to achieve clamping, in cooperation with the clamping assembly on the right side, the pipeline can be fixed to avoid slipping during detection to affect the detection result, during detection, the pressing test assembly 3 can be used for detection, the steel ball 309 with a suitable diameter is selected and installed below the pressing plate 308, then the holding member 303 can be held to drive the screw rod 304 to twist, so that the pressing plate 308 moves downward, the pressure is slowly applied through the loading mechanism, the steel ball 309 contacts the surface of the pipeline corrosion-resistant coating, and the pressure is gradually increased, during the application of pressure, the change of the coating surface is observed, and the pressure value when the coating starts to crack, peel or other damage is recorded. The pressure value is judged by the depth of downward sliding, the above steps are repeated, different diameter steel balls are used for testing to obtain the adhesion data of the coating under different pressure conditions, the adhesion characteristics of the coating under different pressure distribution can be understood, the quality and performance of the corrosion-resistant coating can be evaluated, the use effect is good, and the adjustable magnifying assembly 5 can be used during observation, in use, the stepping motor 504 can be started to drive the rotating shaft rod 505 to rotate, which can drive the supporting frame 501 to follow the rotation, so that the magnifying glass 509 approaches the crack, the angle is adjusted through the stepping motor 504, the height is adjusted through the hydraulic telescopic rod and the connecting plate body 507, the connecting plate body 507 is driven to ascend and descend, and the above structure is arranged to press, the magnifying glass 509 ascends and descends following the pressing point, and the magnifying observation of the test area is always maintained. When the crack length reaches the preset value, it can be determined that the adhesion of the coating is not up to standard, the intuitive observation and result determination are realized, and the adjustable magnifying assembly 5 is arranged to magnify the crack for accurate judgment.

[0039] It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting; it is not intended to exclude myriad other embodiments of the present application that other inventors can develop based on the same general inventive concepts embodied by the described embodiments. That is, although the present application is described in terms of particular embodiments and illustrative figures, it should be apparent that the scope of the present application is not limited to these specific embodiments.

[0040] While the embodiments of the application have been shown and described herein, it will be understood by those skilled in the art that many changes, modifications, substitutions and alterations to these embodiments can be made without departing from the spirit and scope of the present application, which is defined by the appended claims and their equivalents.

Claims

1. A device for testing the adhesion of a corrosion protection coating of a corrosion protection pipe, comprising a base (1), characterized in that: The top of the base (1) is provided with a placing table (2), the top of the placing table (2) is provided with an adjusting and fixing assembly (4), the top back of the placing table (2) is provided with a pressing test assembly (3), the front of the adjusting and fixing assembly (4) is provided with an adjustable amplifying assembly (5); The pressing test assembly (3) comprises a placing rack (301), a connecting block (302), a holding piece (303), a screw rod (304), a transparent observation window (305), a connecting strip (306), a scale strip (307), a pressing plate (308) and a steel ball (309), the placing rack (301) is fixedly connected to the top back of the base (1), the connecting block (302) is fixedly connected to the top front of the placing rack (301), the inside of the connecting block (302) is provided with a threaded groove, the screw rod (304) is screwedly connected to the inside of the connecting block (302), the holding piece (303) is fixedly connected to the top of the screw rod (304), the transparent observation window (305) is fixedly connected to the front of the connecting block (302), the connecting strip (306) is fixedly connected to the right side of the connecting block (302), the scale strip (307) is fixedly connected to the right side of the connecting strip (306), the pressing plate (308) is rotationally connected to the bottom of the screw rod (304), and the steel ball (309) is installed at the bottom of the pressing plate (308). Said adjusting and fixing component (4) comprises a connecting plate piece (401), a threaded rod (402), a holding rod (403), a placing seat (404), a supporting bottom piece (405), a placing air bag piece (406), an air pump (407), a conveying air pipe (408), an antiskid elastic pad (409), a limiting seat (410), a rack (411), a gear (412), a connecting rod (413), a connecting round piece (414), an elastic thumb strap (415), a bearing piece (416) and a fixing bottom plate (417), the connecting plate piece (401) is fixedly connected to the front face of the placing rack (301), the inside of the threaded rod (402) is provided with a threaded groove hole, the threaded rod (402) is threadedly connected to the inside of the connecting plate piece (401), the holding rod (403) is fixedly connected to the right side of the threaded rod (402), the inside of the placing seat (404) is provided with a through groove, the diameter of the through groove is greater than the rod diameter of the threaded rod (402), the inside right side of the placing air bag piece (406) is provided with a through hole which is equal to the diameter of the through groove, the supporting bottom piece (405) is fixedly connected to the top of the placing table (2), the placing seat (404) is fixedly connected to the top of the supporting bottom piece (405), the placing air bag piece (406) is fixedly connected to the top of the placing seat (404), the air pump (407) is fixedly connected to the front face of the placing seat (404), the conveying air pipe (408) is fixedly connected to the top of the air pump (407), one end of the conveying air pipe (408) which is far away from the top of the air pump (407) is fixedly connected to the bottom of the placing air bag piece (406), the antiskid elastic pad (409) is fixedly connected to the top of the placing air bag piece (406), the limiting seat (410) is fixedly connected to the top left side of the placing seat (404), the fixing bottom plate (417) is fixedly connected to the top of the placing seat (404), the bearing piece (416) is fixedly connected to the top of the fixing bottom plate (417), the connecting rod (413) is fixedly connected to the inner ring of the bearing piece (416), the connecting round piece (414) is fixedly connected to the surface of the connecting rod (413), the elastic thumb strap (415) is fixedly connected to the surface of the connecting round piece (414), the gear (412) is fixedly connected to the top of the connecting rod (413), and the gear (412) is engaged with the rack (411).

2. A device for testing the adhesion of a corrosion protective coating on a corrosion protective pipe according to claim 1, characterized in that The adjustable amplification assembly (5) comprises a containing frame (501), a connecting frame (502), an inner placing rod (503), a stepping motor (504), a rotating shaft rod (505), a limiting strip (506), a connecting plate body (507), a placing column piece (508), a magnifying glass (509), a bottom end connecting block (510), a scale ring piece (511), a connecting piece (512), a magnetic attraction ring (513), a pointer (514) and a supporting thin rod (515), the connecting frame (502) is fixedly connected to the front right side of the placing seat (404), the inner placing rod (503) is fixedly connected to the inner back surface of the connecting frame (502), the stepping motor (504) is fixedly connected to the front surface of the inner placing rod (503), the rotating shaft rod (505) is fixedly connected to the output shaft of the stepping motor (504), the bottom end connecting block (510) is fixedly connected to the surface of the rotating shaft rod (505), the containing frame (501) is fixedly connected to the inner portion of the bottom end connecting block (510), the limiting strip (506) is fixedly connected to the front surface of the containing frame (501), the placing column piece (508) is fixedly connected to the inner portion of the connecting plate body (507), the magnifying glass (509) is fixedly connected to the back surface of the placing column piece (508), the connecting piece (512) is fixedly connected to the top of the rotating shaft rod (505), the pointer (514) is fixedly connected to the front surface of the rotating shaft rod (505), and the scale ring piece (511) is fixedly connected to the front surface of the supporting thin rod (515).

3. A device for testing the adhesion of a corrosion protective coating on a corrosion protective pipe according to claim 2, characterized in that The inner bottom end of the containing frame (501) is provided with a hydraulic telescopic rod, and the connecting plate body (507) is fixedly connected to the top of the hydraulic telescopic rod.

4. A device for testing the adhesion of a corrosion protective coating on a corrosion protective pipe according to claim 3, characterized in that The magnetic attraction ring (513) is slidingly connected to the inner ring of the scale ring piece (511), and the magnetic attraction ring (513) is magnetically connected to the scale ring piece (511).

5. A device for testing the adhesion of a corrosion protective coating on a corrosion protective pipe according to claim 4, characterized in that The diameters of the steel balls (309) gradually increase from left to right, and the steel balls (309) are distributed at equal intervals at the bottom of the pressing plate (308).

6. A device for testing the adhesion of a corrosion protective coating on a corrosion protective pipe according to claim 5, characterized in that The rack (411) is slidingly connected to the inner portion of the limiting seat (410), and the thickness of the rack (411) is matched with the upper and lower end distance of the inner portion of the limiting seat (410).

7. A device for testing the adhesion of a corrosion protective coating on a corrosion protective pipe according to claim 6, characterized in that The connecting plate body (507) is slidingly connected to the mutually close one end of the limiting strip (506).

8. A device for testing the adhesion of a corrosion protective coating on a corrosion protective pipe according to claim 7, characterized in that The magnetic attraction ring (513) is fixedly connected to the end, away from the rotating shaft rod (505), of the connecting piece (512), and the diameter of the magnetic attraction ring (513) is matched with the inner diameter of the scale ring piece (511).

9. A device for testing the adhesion of a corrosion protective coating on a corrosion protective pipe according to claim 8, characterized in that The right back surface of the connecting frame (502) is fixedly connected with a supporting plate body, and the supporting thin rod (515) is fixedly connected to the front surface of the supporting plate body.

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