Water-based fireproof coating anti-cracking test device

Abstract

The invention discloses an anti-cracking test device for a water-based fireproof coating, and particularly relates to the technical field of coating testing, the anti-cracking test device is technically characterized by comprising a base and further comprising a test mechanism, the test mechanism comprises a test tube, an impact hammer is arranged in the test tube, and a punch is arranged below the impact hammer; and the clamping mechanism comprises a rectangular plate located in the test tube, the surface of the rectangular plate is rotatably connected with two rotating rods, and the arc surfaces of the two rotating rods are fixedly connected with connecting rods and gears. A plurality of inserting plates are arranged on a testing pipe at equal intervals to serve as testing points of different heights, through downward movement of a rectangular plate, when a clamping block makes contact with a circular plate on an impact hammer, the impact hammer can be automatically clamped by means of the elastic force effect of a first spring, and after the impact hammer is moved upwards, the testing points of the impact hammer can be automatically tested by pressing the inserting plates of the corresponding heights. And by matching with the fixed block, the effect of automatically releasing the impact hammer is achieved, so that an impact test is performed on a base material below.

Description

Technical Field

[0001] This invention belongs to the field of coating testing technology, specifically relating to a crack resistance testing device for water-based fire-retardant coatings. Background Technology

[0002] Water-based fire-retardant coatings are functional coatings made with water as the dispersion medium and containing flame retardants, film-forming agents, pigments, and additives. Their core function is to form a fire-resistant protective layer on the substrate surface. When exposed to fire, they delay the substrate's combustion through mechanisms such as expansion, heat insulation, and flame retardancy. Crack resistance tests on water-based fire-retardant coatings are conducted to verify their ability to resist cracking during application, curing, and long-term use.

[0003] When conducting crack resistance tests on coatings, staff place the coated substrate on a test bench, move the impact hammer to a designated height, and then drop the impact hammer downwards, causing the lower punch to move and impact the substrate below. This allows staff to observe whether cracks appear on the coating surface of the substrate. To avoid the impact hammer falling with excessive force due to uneven force applied by hand or slight hand shaking when manually releasing the impact hammer, staff need to temporarily clamp the impact hammer using a clamping platform before releasing it. In actual testing, evaluating the crack resistance of the same substrate often requires completing multiple impact tests at different heights. Each time the impact height is adjusted, the staff has to repeat a tedious operating procedure: first, loosen the fixing screws of the clamping table and the impact hammer guide rail, manually push the clamping table along the guide rail to the new height scale line, and then tighten the fixing screws again after alignment. For testing multiple substrates, the staff needs to frequently adjust the position of the clamping table, which is very tedious. Summary of the Invention

[0004] The purpose of this invention is to provide a water-based fire-retardant coating crack resistance testing device to solve the problem of cumbersome operation when adjusting different test heights in existing testing instruments.

[0005] To achieve the above objectives, the present invention provides the following technical solution: A water-based fire-retardant coating crack resistance testing device includes a base and further includes: The testing mechanism includes a test tube, an impact hammer is provided inside the test tube, and a punch is provided below the impact hammer; The clamping mechanism includes a rectangular plate located inside the test tube. Two rotating rods are rotatably connected to the surface of the rectangular plate. A connecting rod and a gear are fixedly connected to the arc surface of each of the two rotating rods. A locking block is fixedly connected to the bottom of each of the two connecting rods. A first spring is provided between the two connecting rods. The auxiliary mechanism includes a long strip plate located on one side of the test tube. The surface of the long strip plate has grooves and multiple rectangular slots. A trapezoidal block is fixedly connected to the inner wall of the rectangular slot. Multiple insertion holes are opened on the arc surface of the test tube. Insert plates are slidably connected inside the insertion holes. A rectangular column is fixedly connected to the side wall of the insert plate. A third spring is provided at the bottom of the insert plate. A second spring is provided at the bottom of the long strip plate. A column is fixedly connected to the top of the impact hammer. A circular plate is fixedly connected to the top of the column.

[0006] Preferably, the testing mechanism further includes a fixing frame fixedly connected to the end face of the base. The surface of the fixing frame is equipped with a first fixing ring and a second fixing ring. The test tube is installed inside the first fixing ring, and the punch is disposed inside the second fixing ring. A cushion block is fixedly connected to the end face of the base. A first handle is fixedly connected to the arc surface of the impact hammer. A strip hole is opened on the arc surface of the test tube. The end of the first handle away from the impact hammer passes through the test tube through the strip hole.

[0007] Preferably, the inner arc surface of the test tube has two sliding grooves, the inner walls of the two sliding grooves are slidably connected to sliders, the surfaces of the two sliders are fixedly connected to L-shaped plates, the ends of the two L-shaped plates that are close to each other are respectively fixedly connected to the two sides of a rectangular plate, the surface of the rectangular plate is fixedly connected to a block, and the end face of the block is fixedly connected to a pull rod.

[0008] Preferably, each of the two connecting rods is fixedly connected to a fixed post on the side closest to each other, and the two ends of the first spring are fixedly connected to the two fixed posts respectively, and the teeth of the two gears mesh with each other.

[0009] Preferably: a connecting plate is fixedly connected to the side wall of the test tube, a frame is fixedly connected to the end face of the connecting plate, two fixed rails are fixedly connected to the end face of the connecting plate, a sliding plate is slidably connected to the inner wall of each of the two fixed rails, the two sliding plates are respectively fixedly connected to both sides of the long strip, a fixing block is fixedly connected to the bottom of the long strip, and the two ends of the second spring are respectively fixedly connected to the fixing block and the connecting plate.

[0010] Preferably, the arc surface of the test tube is fixedly connected to multiple rectangular frames, and multiple insert plates are slidably inserted into the inner walls of the multiple rectangular frames. The side walls of the rectangular frames are provided with limiting holes that cooperate with the rectangular columns.

[0011] Preferably, a connecting block is fixedly connected to the bottom surface of the insert plate, the two ends of the third spring are fixedly connected to the connecting block and the rectangular frame respectively, and a second handle is fixedly connected to one end of the insert plate.

[0012] Preferably, the cross-sectional shape of the groove is trapezoidal, and a plurality of rectangular grooves and recesses are equidistantly distributed on the surface of the long strip.

[0013] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention uses multiple insert plates equidistantly arranged on the test tube as test points of different heights. By moving the rectangular plate downwards, when the clamping block contacts the circular plate on the impact hammer, the impact hammer can be automatically clamped by the elastic force of the first spring. After moving the impact hammer upwards, pressing the corresponding height insert plate cooperates with the fixing block to achieve the effect of automatically releasing the impact hammer, thereby performing an impact test on the substrate below. That is, when changing test points of different heights, it is only necessary to press the corresponding height insert plate. Compared with the prior art, which requires repeatedly turning screws to change the height of the test points, the operation is more convenient.

[0014] 2. This invention releases the impact hammer by pressing the insert plate at a certain height. When it is necessary to change the test height, simply press the insert plate at another test height. With the help of the rectangular column pressing the trapezoidal block and the elastic force of the second and third springs, the locking state of the previous test height can be automatically released. Furthermore, when pressing the insert plate at the groove, the locking state of all test heights can be released, allowing the entire clamping mechanism to move smoothly inside the test tube.

[0015] 3. After the impact hammer is released by pressing the insert plate at a certain height, the L-shaped plate can be supported by pressing the insert plate below the current test height. This achieves the effect of supporting and stabilizing the entire clamping mechanism, avoiding the situation where the entire clamping mechanism continues to move down and impact the impact hammer again after the impact hammer releases and impacts the substrate below. In other words, the insert plate can cooperate with the connecting rod to automatically release the impact hammer and automatically support and stabilize the clamping mechanism after the test is completed. Attached Figure Description

[0016] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 For the present invention Figure 1 A schematic diagram of the planar structure; Figure 3 This is a partial structural schematic diagram of the test tube of the present invention; Figure 4 This is a partial planar structural schematic diagram of the clamping mechanism and auxiliary mechanism of the present invention; Figure 5 This is a partial structural schematic diagram of the clamping mechanism and impact hammer of the present invention; Figure 6 For the present invention Figure 5 A partial planar structural diagram; Figure 7 This is a partial structural schematic diagram of the auxiliary mechanism of the present invention; Figure 8 For the present invention Figure 7 A partial diagram of the split structure; Figure 9 This is a partial planar structural diagram of the long strip plate of the present invention; Figure 10 This is a partial structural diagram of the rectangular frame and insert plate of the present invention; Figure 11 For the present invention Figure 10 A schematic diagram of the structure viewed from below; Figure 12 This is a schematic diagram of the structure of the insert plate after it has been moved.

[0017] In the diagram: 1. Base; 101. Fixing frame; 102. First fixing ring; 103. Second fixing ring; 104. Test tube; 105. Punch; 106. Pillow pad; 107. Impact hammer; 108. First handle; 2. Clamping mechanism; 201. Slide groove; 202. Slider; 203. L-shaped plate; 204. Rectangular plate; 205. Block; 206. Pull rod; 207. Rotating rod; 208. Connecting rod; 209. Locking block; 210. Fixed column; 211. First spring; 212. Column; 213. Circular plate; 214. Gear; 3. Auxiliary mechanism; 301. Connecting plate; 302. Frame; 303. Fixed track; 304. Slide plate; 305. Long strip plate; 306. Rectangular groove; 3061. Trapezoidal block; 307. Groove; 308. Fixing block; 309. Second spring; 310. Rectangular frame; 311. Limiting hole; 312. Insert plate; 3121. Insertion hole; 313. Rectangular column; 314. Third spring; 315. Connecting block; 316. Second grip. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0019] Reference Figures 1-12 As shown, the present invention provides a water-based fire-retardant coating crack resistance testing device, including a base 1, and further comprising: The testing mechanism includes a test tube 104, an impact hammer 107 inside the test tube 104, a punch 105 below the impact hammer 107, and a fixing frame 101 fixedly connected to the end face of the base 1. A first fixing ring 102 and a second fixing ring 103 are installed on the surface of the fixing frame 101. The test tube 104 is installed inside the first fixing ring 102, and the punch 105 is located inside the second fixing ring 103. A cushion block 106 is fixedly connected to the end face of the base 1. A first handle 108 is fixedly connected to the arc surface of the impact hammer 107. A strip hole is opened on the arc surface of the test tube 104. The end of the first handle 108 away from the impact hammer 107 passes through the test tube 104 through the strip hole. In this embodiment, the testing mechanism is existing technology. The test tube 104 is provided with scale lines. The punch 105 is elastically installed inside the second fixed ring 103. After being impacted and pressed down by the impact hammer 107, the punch 105 can rebound and return to its initial state after the impact hammer 107 is moved away. This is a technology well known to those skilled in the art, and will not be described in detail here.

[0020] In an optional embodiment: clamping mechanism 2, the clamping mechanism 2 includes a rectangular plate 204 located inside the test tube 104, two rotating rods 207 are rotatably connected to the surface of the rectangular plate 204, the arc surfaces of the two rotating rods 207 are fixedly connected to the connecting rods 208 and gears 214, the bottom of the two connecting rods 208 are fixedly connected to the locking blocks 209, and a first spring 211 is provided between the two connecting rods 208; The inner arc surface of the test tube 104 has two sliding grooves 201. The inner walls of the two sliding grooves 201 are slidably connected to sliders 202. The surfaces of the two sliders 202 are fixedly connected to L-shaped plates 203. The ends of the two L-shaped plates 203 that are close to each other are fixedly connected to the two sides of a rectangular plate 204. The surface of the rectangular plate 204 is fixedly connected to a block 205. The end face of the block 205 is fixedly connected to a pull rod 206.

[0021] In an optional embodiment: two connecting rods 208 are fixedly connected to a fixed post 210 on the side close to each other, the two ends of the first spring 211 are fixedly connected to the two fixed posts 210 respectively, and the teeth of the two gears 214 mesh with each other.

[0022] It should be noted that the bottom of the locking block 209 is arc-shaped. When the two locking blocks 209 are squeezed, they will separate in a direction away from each other. With the help of the elastic force of the first spring 211, when the locking block 209 passes the circular plate 213, the first spring 211 will rebound, and the two locking blocks 209 will be at the bottom of the circular plate 213, which can automatically clamp the impact hammer 107. The two gears 214 play a transmission role so that the two connecting rods 208 can swing synchronously.

[0023] In an optional embodiment: auxiliary mechanism 3, the auxiliary mechanism 3 includes a long strip plate 305 located on one side of the test tube 104, the surface of the long strip plate 305 is provided with a groove 307 and a plurality of rectangular grooves 306, the inner wall of the rectangular grooves 306 is fixedly connected with a trapezoidal block 3061, the arc surface of the test tube 104 is provided with a plurality of insertion holes 3121, the inside of the insertion holes 3121 is slidably connected with an insertion plate 312, the side wall of the insertion plate 312 is fixedly connected with a rectangular column 313, the bottom of the insertion plate 312 is provided with a third spring 314, the bottom of the long strip plate 305 is provided with a second spring 309, the top of the impact hammer 107 is fixedly connected with a column 212, and the top of the column 212 is fixedly connected with a circular plate 213.

[0024] In this embodiment, the cross-sectional shape of the groove 307 is trapezoidal. When the rectangular post 313 corresponding to the groove 307 moves, it can release the locking state of all test heights, so that the entire clamping mechanism 2 can move smoothly inside the test tube 104. That is, no insert plate 312 will extend into the test tube 104. When it is necessary to change the test height, simply press the insert plate 312 of another test height. With the help of the rectangular post 313 pressing the trapezoidal block 3061 and the elastic force of the second spring 309 and the third spring 314, the locking state of the previous test height can be automatically released, so as to facilitate the change of test height. The cross-sectional shape of the end of the insert plate 312 away from the second grip 316 is trapezoidal, so that when the insert plate 312 contacts the connecting rod 208, the connecting rod 208 can swing better.

[0025] A connecting plate 301 is fixedly connected to the side wall of the test tube 104. A frame 302 is fixedly connected to the end face of the connecting plate 301. The frame 302 serves to cover the entire auxiliary mechanism 3. Two fixed rails 303 are fixedly connected to the end face of the connecting plate 301. Slide plates 304 are slidably connected to the inner walls of the two fixed rails 303. The two slide plates 304 are fixedly connected to both sides of the long strip 305. A fixing block 308 is fixedly connected to the bottom of the long strip 305. The two ends of the second spring 309 are fixedly connected to the fixing block 308 and the connecting plate 301, respectively.

[0026] It should be noted that when the long strip 305 moves, the slide plate 304 will slide inside the fixed track 303, which serves to guide the long strip 305. Multiple rectangular slots 306 and grooves 307 are equidistantly distributed on the surface of the long strip 305. Multiple second grips 316 are equally spaced and serve as test point positions at different heights. By pressing the second grip 316 at the corresponding height, the corresponding insert plate 312 is engaged with the fixed block 308, achieving the effect of automatically releasing the impact hammer 107, thereby performing an impact test on the substrate below. That is, when changing test points at different heights, it is only necessary to press the insert plate 312 at the corresponding height.

[0027] In an optional embodiment: the arc surface of the test tube 104 is fixedly connected to a plurality of rectangular frames 310, and a plurality of insert plates 312 are slidably inserted into the inner walls of the plurality of rectangular frames 310 respectively. The side walls of the rectangular frames 310 are provided with limiting holes 311 that cooperate with the rectangular posts 313.

[0028] It should be noted that the limiting hole 311 serves to facilitate the smooth movement of the rectangular column 313.

[0029] In an optional embodiment: a connecting block 315 is fixedly connected to the bottom surface of the insert plate 312, the two ends of the third spring 314 are fixedly connected to the connecting block 315 and the rectangular frame 310 respectively, and a second handle 316 is fixedly connected to one end of the insert plate 312.

[0030] It should be noted that after the second handle 316 is pressed to a certain height to move the insert plate 312 and release the impact hammer 107, pressing the second handle 316 below the current test height will support the L-shaped plate 203 through the insert plate 312, thus achieving the effect of supporting and stabilizing the entire clamping mechanism 2. This avoids the situation where the impact hammer 107 impacts the substrate below after being released, and then the entire clamping mechanism 2 continues to move down and impact the impact hammer 107 again.

[0031] In summary, the insert plate 312 can cooperate with the connecting rod 208 to automatically release the impact hammer 107, and can also automatically support and stabilize the clamping mechanism 2 after the test is completed.

[0032] The working principle of this invention is as follows: During use, the operator places the coated substrate stably on the pillow block 106, then moves the pull rod 206 downwards, causing the entire clamping mechanism 2 to move downwards. When the locking block 209 contacts the circular plate 213, due to the arc-shaped bottom of the locking block 209, the two locking blocks 209 are squeezed and separate in a direction away from each other, i.e., the rotating rod 207 rotates, and the first spring 211 is compressed until the locking block 209 passes the circular plate 213. At this time, the first spring 211 rebounds, and the two locking blocks 209 will be at the bottom of the circular plate 213. Since the test tube 104 has scale lines, after determining the test height, the second handle 316 corresponding to the test height can be pressed. It should be noted that the leftmost... Using the lower second grip 316 as a reference, the height of the third position of the second grip 316 counting upwards is the minimum test height. The second grip 316 drives the insert plate 312 to move, and the insert plate 312 drives the rectangular column 313 to move. The rectangular column 313 will then squeeze the trapezoidal block 3061. At this time, the third spring 314 is in a compressed state. Since the area where the trapezoidal block 3061 is squeezed is inclined, the entire strip plate 305 will move downwards. At this time, the second spring 309 is in a compressed state until the rectangular column 313 is no longer squeezed on the trapezoidal block 3061. Then the second spring 309 rebounds, and the rectangular column 313 will be in the gap between the trapezoidal block 3061 and the rectangular groove 306. At this time, the position of the insert plate 312 will be stable and inside the test tube 104. Figure 12 As shown, by moving the pull rod 206 upward, the entire impact hammer 107 can be lifted. As the pull rod 206 moves the impact hammer 107 upward, when the left connecting rod 208 contacts the insert plate 312 extending into the test tube 104, the pull rod 206 is moved slowly so that the left connecting rod 208 is pressed against the insert plate 312 extending into the test tube 104. The left connecting rod 208 will drive the left rotating rod 207 to rotate, causing the left gear 214 to rotate. The left gear 214 will then drive the right gear 214. Then the two connecting rods 208 will rotate simultaneously, and the two locking blocks 209 will swing away from each other, disengaging from the clamping of the circular plate 213. The impact hammer 107 falls downward and hits the punch 105. The punch 105 is impacted and moves downward to hit the base material at the bottom. Next, the operator can press the second handle 316 below the current test height. At this time, the second handle 316 drives the insert plate 312 to move, the rectangular column 313 squeezes the trapezoidal block 3061, and the long plate 305 moves down. When the rectangular column 313 is released from squeezing the trapezoidal block 3061, the third spring 314 at the previous test height will rebound, causing the insert plate 312 at the previous test height to move out of the test tube 104 and return to the initial state. At this time, the insert plate 312 will extend into the test tube 104 again. Then, the pull rod 206 is released, and the slider 202 slides down along the inside of the slide groove 201. Finally, the L-shaped plate 203 on the left side of the L-shaped plate 203 will rest on the insert plate 312 that extends into the test tube 104, which plays the role of supporting the entire clamping mechanism 2. This prevents the impact hammer 107 from releasing and impacting the substrate below, and then the entire clamping mechanism 2 continues to move down and impact the impact hammer 107 again. When changing the test height, press the second handle 316 at the determined test height again to move the insert plate 312, so that the insert plate 312 is inserted into the test tube 104. The principle is the same as above, so it will not be described in detail here. When it is necessary to remove the insert plate 312 from the test tube 104, press the second handle 316 at the lowest point. The insert plate 312 squeezes the inclined surface of the groove 307, and the second spring 309 is compressed. Since the groove 307 corresponding to the lowest insert plate 312 is trapezoidal, when the insert plate 312 contacts the bottom wall of the groove 307, the third spring 314 corresponding to the insert plate 312 that was previously inserted into the test tube 104 will rebound. At this time, release the second handle 316, and the second spring 309 will rebound and return to the initial state.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A crack resistance testing device for water-based fire-retardant coatings, comprising a base (1), characterized in that, Also includes: The testing mechanism includes a test tube (104), an impact hammer (107) is provided inside the test tube (104), and a punch (105) is provided below the impact hammer (107). The clamping mechanism (2) includes a rectangular plate (204) located inside the test tube (104). Two rotating rods (207) are rotatably connected to the surface of the rectangular plate (204). A connecting rod (208) and a gear (214) are fixedly connected to the arc surface of the two rotating rods (207). A locking block (209) is fixedly connected to the bottom of the two connecting rods (208). A first spring (211) is provided between the two connecting rods (208). The auxiliary mechanism (3) includes a long strip plate (305) located on one side of the test tube (104). The surface of the long strip plate (305) is provided with a groove (307) and a plurality of rectangular grooves (306). A trapezoidal block (3061) is fixedly connected to the inner wall of the rectangular groove (306). A plurality of insertion holes (3121) are provided on the arc surface of the test tube (104). An insertion plate (312) is slidably connected inside the insertion hole (3121). A rectangular column (313) is fixedly connected to the side wall of the insertion plate (312). A third spring (314) is provided at the bottom of the insertion plate (312). A second spring (309) is provided at the bottom of the long strip plate (305). A column (212) is fixedly connected to the top of the impact hammer (107). A circular plate (213) is fixedly connected to the top of the column (212).

2. The water-based fire-retardant coating crack resistance testing device according to claim 1, characterized in that: The testing mechanism also includes a fixing frame (101) fixedly connected to the end face of the base (1). The surface of the fixing frame (101) is equipped with a first fixing ring (102) and a second fixing ring (103). The test tube (104) is installed inside the first fixing ring (102). The punch (105) is set inside the second fixing ring (103). The end face of the base (1) is fixedly connected with a cushion block (106). The arc surface of the impact hammer (107) is fixedly connected with a first handle (108). The arc surface of the test tube (104) is provided with a strip hole. The end of the first handle (108) away from the impact hammer (107) passes through the test tube (104) through the strip hole.

3. The water-based fire-retardant coating crack resistance testing device according to claim 1, characterized in that: The inner arc surface of the test tube (104) has two grooves (201). The inner walls of the two grooves (201) are slidably connected to sliders (202). The surfaces of the two sliders (202) are fixedly connected to L-shaped plates (203). The ends of the two L-shaped plates (203) that are close to each other are fixedly connected to the two sides of a rectangular plate (204). The surface of the rectangular plate (204) is fixedly connected to a block (205). The end face of the block (205) is fixedly connected to a pull rod (206).

4. The water-based fire-retardant coating crack resistance testing device according to claim 1, characterized in that: The two connecting rods (208) are fixedly connected to a fixed post (210) on the side close to each other. The two ends of the first spring (211) are fixedly connected to the two fixed posts (210) respectively. The teeth of the two gears (214) mesh with each other.

5. The water-based fire-retardant coating crack resistance testing device according to claim 1, characterized in that: A connecting plate (301) is fixedly connected to the side wall of the test tube (104). A frame (302) is fixedly connected to the end face of the connecting plate (301). Two fixed rails (303) are fixedly connected to the end face of the connecting plate (301). Slide plates (304) are slidably connected to the inner walls of the two fixed rails (303). The two slide plates (304) are fixedly connected to both sides of the long strip (305). A fixing block (308) is fixedly connected to the bottom of the long strip (305). The two ends of the second spring (309) are fixedly connected to the fixing block (308) and the connecting plate (301) respectively.

6. The water-based fire-retardant coating crack resistance testing device according to claim 1, characterized in that: The arc surface of the test tube (104) is fixedly connected to multiple rectangular frames (310), and multiple insert plates (312) are slidably inserted into the inner walls of the multiple rectangular frames (310). The side walls of the rectangular frames (310) are provided with limiting holes (311) that cooperate with the rectangular columns (313).

7. The water-based fire-retardant coating crack resistance testing device according to claim 1, characterized in that: The bottom surface of the insert plate (312) is fixedly connected to a connecting block (315), the two ends of the third spring (314) are fixedly connected to the connecting block (315) and the rectangular frame (310) respectively, and one end of the insert plate (312) is fixedly connected to a second handle (316).

8. The water-based fire-retardant coating crack resistance testing device according to claim 1, characterized in that: The groove (307) has a trapezoidal cross-sectional shape, and multiple rectangular grooves (306) and grooves (307) are equidistantly distributed on the surface of the strip plate (305).

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