Coating wear resistance testing device

By designing a coating abrasion resistance testing device, the abrasion resistance of coatings on multiple test plates can be tested using a horizontal adjustment component and a material feeding component. This solves the problem that existing technologies cannot test multiple samples simultaneously and improves testing efficiency.

CN224471476UActive Publication Date: 2026-07-07JURONG GENERATE ELECTRICITY PLANT HUADIAN JIANGSU ENERGY CO LTD +1

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
JURONG GENERATE ELECTRICITY PLANT HUADIAN JIANGSU ENERGY CO LTD
Filing Date
2025-07-24
Publication Date
2026-07-07

AI Technical Summary

Technical Problem

Existing coating sand abrasion resistance testers cannot test multiple samples simultaneously, making operation complex and reducing testing efficiency.

Method used

A coating abrasion resistance testing device was designed, including a horizontal adjustment component, a feeding component, and a mounting component. The feeding tube is moved by the horizontal adjustment component to realize the coating abrasion resistance testing of multiple test plates, simplifying the operation process.

Benefits of technology

It enables the testing of coating abrasion resistance on multiple test plates under the same conditions, improving testing efficiency and simplifying the operation process.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model provides a kind of coating wear resistance detection device, it is related to detection equipment technical field, specifically includes: horizontal adjusting assembly, blanking assembly and mounting, horizontal adjusting assembly includes the locking piece that can move along horizontal direction;Blanking assembly is connected with the locking piece transmission, and blanking assembly includes the blanking tube extending along vertical direction, the top of blanking tube is equipped with feed inlet, and the bottom of blanking tube is equipped with the discharge outlet opposite with the feed inlet along vertical direction;Mounting has multiple and is sequentially arranged below blanking assembly along the moving direction of locking piece, and mounting has the load surface for carrying and connecting test plate, and the opening direction of load surface is towards the discharge outlet, and the utility model can be moved by horizontal adjusting assembly blanking tube to be realized in same situation to the coating wear resistance detection of multiple test plates, and it is easy to operate, improves detection efficiency.
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Description

Technical Field

[0001] This utility model relates to the field of testing equipment technology, and more specifically, to a coating wear resistance testing device. Background Technology

[0002] A boiler is an energy conversion device used to heat water to a desired temperature or convert it into steam. To enhance its performance, extend its service life, and improve its thermal efficiency, one or more protective coatings are typically applied to the internal surfaces of the boiler. These coatings are crucial for resisting the erosion and wear of the walls caused by ash and particulate matter generated during combustion.

[0003] During boiler operation, especially when using fuels containing high levels of ash or particulate matter such as coal or biomass, the inner wall suffers significant wear. Over time, this wear can lead to thinning or damage of the inner wall material, reducing heat transfer efficiency and increasing energy consumption. Therefore, before practical application, the coating to be applied to the boiler inner wall must be tested for wear resistance using a coating abrasion tester to ensure its quality.

[0004] The current operating procedure of the coating sand abrasion tester is as follows: First, the test sand (usually quartz sand) is loaded into the collection hopper. Then, the valve connecting the collection hopper and the discharge pipe is opened, allowing the sand to fall naturally onto the test plate located below the discharge pipe (the test plate is coated with the same coating as the inner wall of the boiler) to evaluate relevant data such as scouring time and intensity.

[0005] However, to ensure the accuracy of test results, it is often necessary to test multiple test boards under the same conditions separately. Existing methods require manually removing one test board after each test and installing a new one to continue testing. This method is cumbersome and significantly reduces testing efficiency. Utility Model Content

[0006] The purpose of this invention is to provide a coating abrasion resistance testing device to alleviate the technical problem that current coating sand abrasion resistance testing instruments cannot test multiple samples simultaneously.

[0007] This utility model provides a coating wear resistance testing device, including: a leveling component, a material feeding component, and a mounting component;

[0008] The horizontal adjustment assembly includes a locking member capable of moving horizontally; the material feeding assembly is kinetically connected to the locking member, the material feeding assembly includes a material feeding tube extending vertically, the top of the material feeding tube has a feeding port, and the bottom of the material feeding tube has a discharging port opposite to the feeding port in the vertical direction; multiple mounting members are arranged sequentially below the material feeding assembly along the moving direction of the locking member, the mounting members have a bearing surface for supporting and connecting the test plate, the bearing surface facing the opening direction of the discharging port.

[0009] Furthermore, the coating abrasion resistance testing device also includes a mounting frame; the mounting frame has a support portion and a mounting portion, the mounting portion extending vertically and disposed on one side of the support portion; the horizontal adjustment component is disposed on the support portion.

[0010] Furthermore, the horizontal adjustment assembly includes: a connector, an adjusting screw, and a limiting member;

[0011] A connector is provided at the mounting part; an adjusting screw is provided at the connector and extends horizontally; a limiting member is provided on one side of the adjusting screw and is arranged parallel to the adjusting screw;

[0012] There are two locking components, one of which is threadedly engaged with the adjusting screw, and the other is slidably engaged with the limiting component to slide along the moving direction of the adjusting screw. The extending direction of the adjusting screw is the moving direction of the locking component.

[0013] Furthermore, the locking element includes: a collar and a locking bolt;

[0014] A collar is fitted over the material discharge tube, and the collar has a threaded locking hole; a locking bolt is inserted into the locking hole and threadedly engages with the locking hole, and the locking bolt abuts against the material discharge tube;

[0015] The two locking members are arranged at intervals along the vertical direction and are both connected to the material dropping assembly.

[0016] Furthermore, there are two connectors;

[0017] The extension direction of the connector is the same as that of the adjusting screw and the limiting member. The two ends of the connector are provided with connecting parts, and the two connectors are respectively provided with the adjusting screw and the limiting member through the connecting parts. The locking member also includes an extension part, which is provided on the outer wall of the collar and extends horizontally. The end of the extension part away from the material feeding assembly is engaged with the connector and can slide along the extension direction of the connector.

[0018] Furthermore, the connector is a connecting rod;

[0019] The two connecting rods are respectively spaced apart from and parallel to the adjusting screw and the limiting member; the end of the extension near the connecting rod is provided with a sleeve, and the inner wall of the sleeve is slidably engaged with the outer wall of the connecting rod.

[0020] Furthermore, the leveling assembly also includes a throttle; the throttle is located at one end of the adjusting screw and is throttle-connected to the adjusting screw.

[0021] Furthermore, the coating abrasion resistance testing device further includes: a recycling component; the recycling component has a recycling tank, the recycling tank is located below the mounting component, and the opening of the recycling tank is arranged opposite to the plurality of mounting components.

[0022] Furthermore, the mounting component is inclined;

[0023] The opening of the recycling tank is opposite to the lowest point of the mounting component.

[0024] Furthermore, the recycling component includes a collection box; there are multiple collection boxes, each corresponding to one of the multiple mounting components, and the recycling slot is located in the collection box.

[0025] Beneficial effects:

[0026] In this invention, the feeding assembly and the horizontal adjustment assembly are connected by a transmission, allowing the feeding tube to move horizontally under the drive of the horizontal adjustment assembly. Multiple mounting components are arranged below the feeding port along the moving direction of the feeding tube. In this structure, the test plate is mounted on the bearing surface of the mounting components, with the top surface of the test plate facing the discharge port. Test sand can be poured into the feeding port of the feeding tube. The sand undergoes free fall within the feeding tube and is discharged from the feeding port to the surface of the test plate, allowing the sand to impact the surface of the test plate corresponding to the feeding port, thereby polishing the surface of the test plate. After polishing, the polished test plate can be disassembled for measurement to test the wear resistance of the test plate. In this invention, the feeding tube can be moved by the horizontal adjustment assembly to achieve wear resistance testing of the coatings of multiple test plates under the same conditions, and the operation is simple, improving the testing efficiency. Attached Figure Description

[0027] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0028] Figure 1 A schematic diagram of the structure of the coating wear resistance testing device provided in this embodiment of the utility model;

[0029] Figure 2 A schematic diagram showing the positional relationship of the mounting grooves in the coating abrasion resistance testing device provided in this embodiment of the utility model;

[0030] Figure 3 A schematic diagram of the locking component in the coating wear resistance testing device provided in this embodiment of the utility model.

[0031] icon:

[0032] 1-Bearing part; 2-Mounting part; 3-Connecting part; 4-Connecting block; 5-Adjusting screw; 6-Turner; 7-Locking part; 8-Locking bolt; 9-Discharge pipe; 10-Collection hopper; 11-Collection box; 12-Handle; 13-Mounting part; 14-Bearing surface; 15-Limiting part; 101-Mounting groove; 201-Slide rail; 701-Sleeve opening. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0035] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0036] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," and "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0037] Furthermore, terms such as "horizontal" and "vertical" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0038] In the description of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0039] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings.

[0040] See Figures 1 to 3 The coating wear resistance testing device provided in this embodiment includes a horizontal adjustment component, a material feeding component, and a mounting component 13.

[0041] In this embodiment, the horizontal adjustment component includes a locking member 7 that can move horizontally. The material feeding component is connected to the locking member 7 via a transmission connection. The material feeding component includes a material feeding tube 9 extending vertically. The top of the material feeding tube 9 has a feed inlet, and the bottom of the material feeding tube 9 has a discharge outlet that is vertically opposite to the feed inlet. Multiple mounting members 13 are arranged sequentially below the material feeding component along the moving direction of the locking member 7. Each mounting member 13 has a bearing surface 14 for supporting and connecting the test plate, with the bearing surface 14 facing the opening direction of the discharge outlet.

[0042] The material feeding assembly is connected to the horizontal adjustment assembly so that the material feeding pipe 9 can move horizontally under the drive of the horizontal adjustment assembly. Multiple mounting parts 13 are arranged below the material feeding port along the moving direction of the material feeding pipe 9.

[0043] In this structure, the test plate is mounted on the bearing surface 14 of the mounting component 13, with the top surface of the test plate facing the discharge port. Test sand can be poured into the feed port of the discharge pipe 9. The sand falls freely in the discharge pipe 9 and is discharged from the discharge port to the surface of the test plate, so that the sand can hit the surface of the test plate corresponding to the discharge port to achieve the grinding of the surface of the test plate.

[0044] After grinding, the ground test plate can be disassembled for measurement to test the wear resistance of the test plate. In this embodiment, the horizontal adjustment component can drive the material feeding tube 9 to move so as to test the coating wear resistance of multiple test plates under the same conditions. The operation is simple and the testing efficiency is improved.

[0045] Furthermore, in this embodiment, to facilitate the pouring of gravel, the top of the discharge pipe 9 is provided with a collection hopper 10 with a large opening.

[0046] In this embodiment, the coating abrasion resistance testing device further includes a mounting frame. The mounting frame has a support portion 1 and a mounting portion 2, the mounting portion 2 extending vertically and disposed on one side of the support portion 1. A horizontal adjustment assembly is disposed on the support portion 1.

[0047] In this embodiment, the mounting component 13 is connected to the mounting part 2 and is located above the supporting part 1.

[0048] Specifically, in this embodiment, the support part 1 is arranged in the horizontal direction, the mounting part 2 is arranged on one side of the support part 1 and extends in the vertical direction, and the horizontal adjustment component is arranged on the support part 1 so that there is a gap between the pipe opening of the drop pipe 9 arranged on the horizontal adjustment component and the mounting part 13, so that the gravel can fall smoothly onto the test plate.

[0049] In this embodiment, the horizontal adjustment assembly includes a connector 3, an adjusting screw 5, and a limiting member 15. The connector 3 is disposed on the mounting portion 2. The adjusting screw 5 is disposed on the connector 3 and extends horizontally. The limiting member 15 is disposed on one side of the adjusting screw 5 and is arranged parallel to the adjusting screw 5.

[0050] There are two locking parts 7. One locking part 7 is threadedly engaged with the adjusting screw 5, and the other locking part 7 is slidably engaged with the limiting part 15 to slide along the moving direction of the adjusting screw 5. The extending direction of the adjusting screw 5 is the moving direction of the locking part 7.

[0051] Specifically, the adjusting screw 5 and the limiting member 15 are mounted on the mounting part 2 via the connecting member 3. In this embodiment, the adjusting screw 5 and the limiting member 15 are arranged at intervals along the vertical direction on the mounting part 2. Two locking members 7 are respectively arranged on the adjusting screw 5 and the limiting member 15 to realize the two-point connection of the material drop tube 9, thereby fixing the setting direction of the material drop tube 9.

[0052] Furthermore, in this embodiment, the locking member 7 provided on the adjusting screw 5 is threadedly engaged with the adjusting screw 5. When the adjusting screw 5 is rotated, the locking member 7 can be driven to move along the extension direction of the adjusting screw 5, and another locking member 7 slides on the limiting member 15 to follow the movement, thereby realizing the switching of different test plates.

[0053] In this embodiment, the locking component 7 includes a collar and a locking bolt 8. The collar is sleeved on the outside of the feed tube 9, and the collar has a threaded locking hole. The locking bolt 8 is inserted into the locking hole and engages with the threaded locking hole, and the locking bolt 8 abuts against the feed tube 9.

[0054] Among them, the two locking parts 7 are arranged at intervals in the vertical direction and are both connected to the material dropping assembly.

[0055] Specifically, in this embodiment, two locking members 7 are sleeved on the drop pipe 9 at intervals along the vertical direction, thereby achieving two-point connection with the drop pipe 9 and limiting the setting angle of the drop pipe 9, keeping the drop pipe 9 in a vertical state, and thus ensuring that the sand and gravel entering the drop pipe 9 can undergo free fall motion.

[0056] Furthermore, in this embodiment, the collar is locked to the discharge tube 9 by the locking bolt 8. With this structure, the discharge tube 9 can be loosened within the collar by adjusting the locking bolt 8, and then the discharge tube 9 can be moved vertically to adjust its height. After adjusting the height of the discharge tube 9, the locking bolt 8 is tightened again to re-adjust the height of the discharge tube 9 and the discharge opening.

[0057] In this embodiment, there are two connecting members 3. The extending direction of the connecting member 3 is the same as the extending direction of the adjusting screw 5 and the limiting member 15. Both ends of the connecting member 3 are provided with connecting parts, and the two connecting members 3 are respectively adjusted by the adjusting screw 5 and the limiting member 15 through the connecting parts. The locking member 7 also includes an extension part, which is provided on the outer wall of the collar and extends horizontally. The end of the extension part away from the material feeding assembly is engaged with the connecting member 3 and can slide along the extending direction of the connecting member 3.

[0058] In this embodiment, the connector 3 is provided with connecting blocks 4 at both ends. The connecting blocks 4 are provided with connecting holes. The ends of the adjusting screw 5 and the limiting member 15 are adapted to the connecting holes. During installation, the adjusting screw 5 and the limiting member 15 are respectively connected to the two connectors 3 by insertion.

[0059] The end of the extension of the locking member 7 (i.e. the end away from the collar) engages with the connector 3 and can slide on the connector 3, thereby providing further support for the material dropping assembly and improving the stability of the material dropping tube 9.

[0060] Specifically, in this embodiment, the connecting member 3 is a connecting rod. The two connecting rods are respectively spaced apart from and parallel to the adjusting screw 5 and the limiting member 15. The end of the extension near the connecting rod is provided with a sleeve 701, and the inner wall of the sleeve 701 slides in fit with the outer wall of the connecting rod.

[0061] In this embodiment, the connecting rod is a smooth cylinder, and correspondingly, the sleeve 701 is an arc-shaped sleeve 701. The arc-shaped sleeve 701 fits against the outer wall of the cylindrical connecting rod. While achieving a sliding fit, when the discharge tube 9 is subjected to a horizontal external force, the arc-shaped sleeve 701 and the cylindrical connecting rod can distribute the force.

[0062] Furthermore, in this embodiment, the two connecting rods, the adjusting screw 5, and the limiting member 15 respectively form two slides 201. The end of the extension with the sleeve 701 is inserted into the slide 201 and moves along the slide 201, further improving the overall structural stability.

[0063] In this embodiment, the leveling assembly further includes a throttle 6. The throttle 6 is located at one end of the adjusting screw 5 and is throttle-connected to the adjusting screw 5.

[0064] Specifically, in this embodiment, one end of the handle 6 passes through the connecting block 4, which is connected to the end of the adjusting screw 5, and is connected to the adjusting screw 5, thereby realizing the transmission connection between the handle 12 and the adjusting screw 5. The adjusting screw 5 can be rotated by rotating the handle 12, thereby adjusting the horizontal position of the locking member 7 and the material drop tube 9, and thus realizing the material drop and grinding of different test plates.

[0065] In this embodiment, the coating abrasion resistance testing device also includes a recycling component.

[0066] The recycling component has a recycling tank located below the mounting component 13, and the opening of the recycling tank is positioned opposite to multiple mounting components 13.

[0067] After the opening of the recycling tank is set opposite to multiple mounting parts 13, the test plates on the mounting parts 13 are polished by sand dropping, and the sand can fall into the recycling tank, thereby collecting the test sand. The sand can be reused when testing test plates on other mounting parts 13, so as to realize the reuse of sand.

[0068] Furthermore, in this embodiment, the mounting member 13 is inclined. The opening of the recycling tank is opposite to the lowest point of the mounting member 13.

[0069] In this structure, after impacting the test plate, the gravel can fall along the tilt direction of the inclined surface of the test plate (i.e., the tilt direction of the mounting part 13), and the opening of the recycling tank is positioned relative to the lowest point of the mounting part 13 to achieve accurate recycling of the gravel.

[0070] Furthermore, in this embodiment, the recycling component includes a collection box 11. Multiple collection boxes 11 are provided, each corresponding to one of the multiple mounting components 13, and a recycling slot is located within the collection box 11.

[0071] Specifically, in this embodiment, the support member is provided with multiple mounting slots 101 to accommodate and support the collection box 11. In this embodiment, there are three mounting slots 101, three collection boxes 11, and three mounting plates. The three mounting plates are arranged at intervals on the same horizontal plane on the mounting frame to form three test structures. The three collection boxes 11 and the three mounting slots 101 are arranged correspondingly below the three mounting plates. The side wall of the collection box 11 is provided with a handle 12 to realize the collection of sand and gravel in the three test structures and facilitate the picking and placing of the collection box 11.

[0072] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A coating wear resistance detection device, characterized by, The coating abrasion resistance detection device comprises a horizontal adjustment assembly, a blanking assembly and a mounting rack. The horizontal adjustment assembly comprises a locking piece (7) capable of moving in a horizontal direction. The blanking assembly is in transmission connection with the locking piece (7) and comprises a blanking pipe (9) extending in a vertical direction. The top of the blanking pipe (9) is provided with an inlet, and the bottom of the blanking pipe (9) is provided with an outlet opposite to the inlet in the vertical direction.

2. The coating wear resistance detection apparatus according to claim 1, wherein The mounting rack has a bearing part (1) and a mounting part (2). The mounting part (2) extends in the vertical direction and is arranged on one side of the bearing part (1). The horizontal adjustment assembly is arranged on the bearing part (1).

3. The coating wear resistance detection apparatus of claim 2, wherein The horizontal adjustment assembly comprises a connecting piece (3), an adjustment screw (5) and a limiting piece (15). The connecting piece (3) is arranged on the mounting part (2). The adjustment screw (5) extends in the horizontal direction. The limiting piece (15) is arranged on one side of the adjustment screw (5) and is arranged in parallel with the adjustment screw (5). The locking piece (7) has two locking pieces (7).

4. The coating wear resistance detection apparatus according to claim 3, wherein One locking piece (7) is in threaded connection with the adjustment screw (5), and the other locking piece (7) is in sliding connection with the limiting piece (15) to slide in the moving direction of the adjustment screw (5). The extension direction of the adjustment screw (5) is the moving direction of the locking piece (7). The locking piece (7) comprises a sleeve ring and a locking bolt (8). The sleeve ring is arranged outside the blanking pipe (9).

5. The coating wear detection apparatus of claim 4, wherein, The sleeve ring is provided with a threaded locking hole. The locking bolt (8) is inserted into the locking hole and is in threaded connection with the locking hole. The locking bolt (8) abuts against the blanking pipe (9).

6. The coating wear resistance detection apparatus of claim 5, wherein The two locking pieces (7) are arranged in the vertical direction and are in connection with the blanking assembly. The connecting piece (3) has two connecting pieces (3). The extension direction of the connecting piece (3) is the same as the extension direction of the adjustment screw (5) and the limiting piece (15).

7. The coating wear resistance detection apparatus of claim 3, wherein The two ends of the connecting piece (3) are provided with connecting parts. The adjustment screw (5) and the limiting piece (15) are arranged in one-to-one correspondence through the connecting parts. The locking piece (7) further comprises an extension part. The extension part is arranged on the outer wall of the sleeve ring and extends in the horizontal direction. The end of the extension part away from the blanking assembly is in clamping connection with the connecting piece (3) and can slide in the extension direction of the connecting piece (3). The connecting piece (3) is a connecting rod. The two connecting rods are arranged in parallel and are spaced apart from the adjustment screw (5) and the limiting piece (15). The end of the extension part close to the connecting rod is provided with a sleeve opening (701). The inner wall of the sleeve opening (701) is in sliding connection with the outer wall of the connecting rod. The horizontal adjustment assembly further comprises a handle (6). The handle (6) is arranged on one end of the adjustment screw (5) and is in transmission connection with the adjustment screw (5).

8. The coating wear resistance detection apparatus of claim 3, wherein, The coating abrasion resistance detection device further comprises: The recovery assembly has a recovery groove, which is arranged below the mounting member (13), and the opening of the recovery groove is arranged opposite to the mounting member (13).

9. The coating wear resistance detection apparatus of claim 8, wherein, The mounting member (13) is arranged obliquely. The opening of the recovery groove is opposite to the lowest point of the mounting member (13).

10. The coating wear resistance detection apparatus of claim 8, wherein, The recovery assembly comprises: A plurality of collecting boxes (11) are arranged one by one and correspondingly to the mounting members (13), and the recovery groove is arranged in the collecting box (11).