A surface cleaning method and a sandblasting system for a ribbed steel bar

Abstract

The application discloses a ribbed steel bar surface cleaning sand blasting method and a sand blasting system, and belongs to the technical field of ribbed steel bar surface rust cleaning. Different sand blasting materials are selected according to different rust degrees of the ribbed steel bar surface to clean the ribbed steel bar surface. The sand blasting material corresponding to serious rust is 88%-92% corundum refractory brick crushed material and 8%-12% steel slag washed steel beans; the sand blasting material corresponding to general rust is 93%-97% corundum refractory brick crushed material and 2%-7% steel slag washed steel beans; the sand blasting material corresponding to slight rust is more than 99% corundum refractory brick crushed material and less than 1% steel slag washed steel beans, and the particle diameter of the sand blasting material is 1-5 mm. The ribbed steel bar surface is cleaned by using corresponding sand blasting materials according to different rust degrees of the ribbed steel bar surface, so that the ribbed steel bar surface is completely treated, damage to the ribbed steel bar surface caused by excessive impact is avoided, and the use cost of the sand blasting material is reduced.

Description

Technical Field

[0001] This invention relates to the field of rust removal technology for ribbed steel bars, and more specifically, to a sandblasting method and system for cleaning the surface of ribbed steel bars. Background Technology

[0002] Corrosion, especially the corrosion of reinforcing steel in concrete, is one of the dominant and critical factors affecting the overall durability of a structure. This mainly includes uniform corrosion of the steel caused by carbonation. Chloride-induced corrosion is localized, with the worst consequence being that the undissolved corrosion products increase in volume compared to the original steel. These corrosion products accumulate around the steel, generating stress on the surrounding concrete. When this stress exceeds the tensile strength of the concrete, cracks appear. The exposed steel is then exposed to chloride ions, oxygen, and moisture, further accelerating corrosion and ultimately leading to the destruction of the concrete structure's durability.

[0003] Currently, zinc is used to protect the steel bars from corrosion. A zinc or zinc alloy coating is applied to the surface of the ribbed steel bars. When the coating is partially damaged and the ribbed steel bars are exposed, the zinc layer acts as a sacrificial anode to provide cathodic protection for the ribbed steel bars because zinc is a more reactive metal than iron.

[0004] Because ribbed steel bars are rolled at high temperatures, the structure of the high-temperature iron oxide scale varies from the surface to the metal matrix due to differences in temperature and composition. Existing metal surface treatments, such as sandblasting, have a relatively weak impact on the surface treatment of ribbed steel bars. In some cases, the surface treatment of ribbed steel bars is incomplete, resulting in poor quality of the electroplated zinc layer and low corrosion resistance.

[0005] In view of this, the inventors conducted in-depth research to address this need, which led to the present invention. Summary of the Invention

[0006] To overcome the problem that the sandblasting used in the existing metal surface treatment has a weak impact force on the surface treatment of ribbed steel bars, and some ribbed steel bars are not thoroughly treated, resulting in poor quality of electro-galvanized layer and low anti-corrosion performance, the present invention provides a sandblasting method for cleaning the surface of ribbed steel bars, which drives the ribbed steel bars to rotate and move forward, with the length direction of the ribbed steel bars being the same as the transport direction.

[0007] Different sandblasting materials are selected to clean the surface of the ribbed steel bars according to the different degrees of corrosion. The different degrees of corrosion on the ribbed steel bar surface are divided into three corrosion levels: severe corrosion, general corrosion, and slight corrosion. The correspondence between these levels and the sandblasting materials is as follows:

[0008] For severe corrosion, the appropriate sandblasting material is: 88%-92% corundum refractory brick crushed material and 8%-12% steel slag washed steel pellets, with a particle diameter of 1 mm-5 mm.

[0009] For general rust, the appropriate sandblasting material is: 93%-97% corundum refractory brick crushed material and 2%-7% steel slag washed steel pellets, with a particle diameter of 1 mm-5 mm.

[0010] For slight rust, the appropriate blasting material is: over 99% corundum refractory brick pulverized material and less than 1% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm.

[0011] Depending on the degree of corrosion on the surface of the ribbed steel bars, appropriate sandblasting materials are used to clean the surface. This ensures thorough treatment of the ribbed steel bars while avoiding damage to the surface caused by excessive impact force, and also reduces the cost of using sandblasting materials.

[0012] Preferably, the correspondence between different degrees of corrosion on the surface of the ribbed steel bars and the sandblasting material is as follows:

[0013] For severe corrosion, the appropriate sandblasting material is: 90% corundum refractory brick crushed material and 10% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm.

[0014] For general rust, the appropriate sandblasting material is: 95% corundum refractory brick crushed material and 5% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm.

[0015] For minor rust, the appropriate blasting material is 100% corundum refractory brick powder with a particle diameter of 1 mm to 5 mm.

[0016] Here, severe corrosion means that the surface of the ribbed steel bar is severely corroded and the surface iron oxide scale is thick; general corrosion means that the surface of the ribbed steel bar is generally corroded and the surface iron oxide scale is of average thickness; slight corrosion means that the surface of the ribbed steel bar is slightly corroded, and no iron scale has formed on the surface or the iron scale is very thin.

[0017] Preferably, it includes the following steps:

[0018] Step one: Drive the ribbed steel bar to rotate and move forward, whereby...

[0019] A first ribbed steel bar surface inspection device and a sandblasting machine are set up in front and behind the ribbed steel bar transport direction. The sandblasting machine is equipped with a sandblasting gun and three sandblasting boxes. Each sandblasting box is connected to the sandblasting gun through a pipe. A control valve is installed on the pipe connecting each sandblasting box and the sandblasting gun. The three sandblasting boxes are respectively filled with sandblasting materials corresponding to three rust levels: severe rust, general rust, and slight rust.

[0020] Step 2: After receiving the surface image of the ribbed steel bar captured by the first ribbed steel bar surface detection device, compare it with the image in the standard image database to determine the corrosion level of the ribbed steel bar surface.

[0021] Step 3: Based on the determined surface rust level of the ribbed steel bars, control the opening of the control valve connected to the corresponding sandblasting box to sandblast the surface of the ribbed steel bars.

[0022] A standard image database was established, and images of the ribbed steel bar surface were captured using a first ribbed steel bar surface detection device. By comparing these images with those in the standard image database, the corrosion level of the ribbed steel bar surface was determined. Based on the corrosion level, corresponding sandblasting material was used for sandblasting treatment, thereby achieving automated sandblasting cleaning and solving the problem of incomplete rust cleaning of the ribbed steel bar surface.

[0023] Preferably, in step two, the standard image database includes at least a basic image database and an auxiliary image database. The basic image database contains N1 basic reference images for each rust level of the ribbed steel bar surface, and the auxiliary image database contains N2 basic reference images for each rust level of the ribbed steel bar surface, wherein 1≤N1≤5, 3≤N2≤10, and 2N1≤N2≤5N1.

[0024] Set an image recognition threshold and compare the captured images of the ribbed steel bar surface with images in the basic image database and auxiliary image database one by one. If the value is higher than the threshold, it means that they are similar, and if it is lower than the threshold, they are not similar.

[0025] When the similarity rate between the image and the corresponding image in the basic image database and the auxiliary image database exceeds 90%, and the similarity rate between the image and the basic image database exceeds 50%, it is marked as the corresponding corrosion level.

[0026] When the grade marking of the captured ribbed steel bar surface image is not unique or there is no grade marking, the user is prompted to update and adjust the image in the standard image database.

[0027] Before entering the sandblasting machine, take M images of the ribbed steel bar surface at intervals, and compare them one by one with the images in the basic image database and the auxiliary image database. When all the obtained grade marks are the same, it is determined to be the corresponding corrosion grade, where 3≤M≤10.

[0028] When the obtained grade markings are different, and one grade marking accounts for more than 80%, it is determined to be the corrosion grade, and the surface image of the ribbed steel bar that does not have the grade marking is saved to the image database to be analyzed.

[0029] When the obtained grade labels are different, and one grade label accounts for no more than 80%, the user is prompted to update and adjust the images in the standard image database.

[0030] A basic image database and an auxiliary image database are set up. The surface corrosion level of ribbed steel bars is determined by comparing multiple images taken. The auxiliary image database is updated as needed to improve the accuracy of the determination results.

[0031] Preferably, a second ribbed steel bar surface detection device is installed at the rear end of the sandblasting machine to photograph the surface of the ribbed steel bar after sandblasting, to evaluate whether the surface rust removal is thorough and whether the surface of the ribbed steel bar has been damaged due to excessive impact force, and to adjust the sandblasting material ratio and images in the standard image database based on the results, thus playing a feedback role.

[0032] Preferably, in step two, the image database to be analyzed is analyzed. If the image is deleted because of an error in the shooting or because of inconsistent corrosion of the ribbed steel bars, the image is deleted. If the image is deleted because of an error in the comparison mark, the image is saved to the auxiliary image database to replace the image with the lowest comparison accuracy.

[0033] When the similarity rate between the image and the corresponding level image in the basic image database and the auxiliary image database is 100%, the image is saved to the auxiliary image database to replace the image with the lowest comparison accuracy.

[0034] The number of times W1 is found to be dissimilar to the photographed image of the ribbed steel bar surface, but the image grade label is the same as that of the image in the standard image database; the number of times W2 is found to be similar to the photographed image of the ribbed steel bar surface, but the image grade label is different from that of the image in the standard image database; and the total number of comparisons with the photographed image of the ribbed steel bar surface is W. Then the comparison accuracy P of the images in the standard image database is:

[0035] P=(W-W1-W2) / W 100%.

[0036] The present invention also provides a sandblasting system employing the above-described sandblasting method, comprising a roller conveyor and a sandblasting machine; the sandblasting machine includes a sandblasting housing, a sandblasting gun, and a dust collection pipe, wherein the sandblasting housing is fixedly installed on the roller conveyor, and the sandblasting gun and the dust collection pipe are disposed inside the sandblasting housing above the roller conveyor, for sandblasting to remove surface iron oxide scale from ribbed steel bars during rotational transport.

[0037] The bar roller conveyor is equipped with a drive motor for controlling the operation of the bar roller conveyor;

[0038] The sandblasting machine is equipped with a sandblasting gun and three sandblasting chambers. Each sandblasting chamber is connected to the sandblasting gun via a pipe. Each pipe connecting the sandblasting chamber to the sandblasting gun is equipped with a control valve. The three sandblasting chambers contain sandblasting materials corresponding to three rust levels: severe rust, general rust, and slight rust.

[0039] Preferably, the system also includes a control center, and a first ribbed steel bar surface detection device is installed on the roller conveyor in front of the sandblasting machine. The output end of the control center is connected to the control valve and the drive motor; the output end of the first ribbed steel bar surface detection device is connected to the input end of the control center.

[0040] Preferably, the first ribbed steel bar surface detection device is a CCD camera, and the control center is equipped with an image recognition module, a standard image database and a valve control module, and the output end of the CCD camera is connected to the input end of the image recognition module;

[0041] The image recognition module is used to compare the received image transmitted from the CCD camera with the image in the standard image database and determine the surface corrosion level of the ribbed steel bar.

[0042] The valve control module is used to open the control valve between the corresponding sandblasting box and the sandblasting gun based on the surface corrosion level of the ribbed steel bar determined by the image recognition module.

[0043] Preferably, the second ribbed steel bar surface detection device is a CCD camera, the output of which is connected to the control center. The standard image database also includes a post-blasting image database. The image recognition module compares the images taken by the second ribbed steel bar surface detection device with the images in the post-blasting image database to determine whether the blasting is qualified. If it is not qualified, it feeds back to the control center to adjust the blasting material and the standard image database.

[0044] Preferably, the bottom of the sandblasting shell is a funnel-shaped sandblasting recovery chamber, and a conveyor belt is provided below the funnel-shaped sandblasting recovery chamber. A magnetic separator and a screening machine are provided on the conveyor belt.

[0045] Preferably, the sandblasting machine is equipped with a sandblasting batching box, and a stirrer is installed inside the sandblasting batching box. A first sandblasting material box and a second sandblasting material box are connected to the inlet of the sandblasting batching box. The first sandblasting material box contains corundum refractory brick crushed material, and the second sandblasting material box contains steel slag washed steel pellets. A first powder metering valve is installed on the pipeline between the sandblasting batching box and the first sandblasting material box, and a second powder metering valve is installed on the pipeline between the sandblasting batching box and the first sandblasting material box.

[0046] The input terminals of the first powder metering valve and the second powder metering valve are connected to the output terminal of the valve control module.

[0047] Preferably, the bar roller conveyor includes several rows of bar rollers arranged along the length direction of the bar roller conveyor, each row of bar rollers includes several bar rollers arranged perpendicular to the length direction of the bar roller conveyor, and the bar rollers are uniformly distributed with spiral convex lines, and the drive motor directly or indirectly drives all the bar rollers to rotate.

[0048] Preferably, each of the rollers is provided with a first gear at one end near the drive mechanism, and the drive mechanism directly or indirectly drives the first gear to rotate;

[0049] When the row of rollers is located at the end away from the drive mechanism, at least one of the rollers in that row has a second gear at the end away from the drive mechanism.

[0050] When a roller is positioned near one end of the drive mechanism, the first gear of that roller is driven by at least one second gear on the preceding roller.

[0051] Preferably, the bar roller conveyor has a plurality of rotating shafts arranged along a direction perpendicular to the length of the bar roller conveyor, and a plurality of bar rollers are evenly distributed along the length of each rotating shaft. A conveyor frame is installed between two adjacent bar rollers on the same rotating shaft, and a row of bar rollers is formed between two adjacent conveyor frames.

[0052] Each of the rotating shafts has a first gear located near the end of the drive mechanism.

[0053] Preferably, the drive mechanism includes a drive motor, a drive wheel, and a gearbox pulley. The center of the drive wheel is fixedly mounted on the rotating shaft of the drive motor. The center of the gearbox pulley is mounted on the gearbox of the transport frame via a main drive shaft. The drive wheel and the gearbox pulley are connected by a V-belt drive. The other end of the main drive shaft is connected to a transmission gear, which directly or indirectly drives the first gear to rotate.

[0054] The drive mechanism drives the rollers to rotate in the same direction, causing the ribbed steel bars located between two adjacent rollers to rotate and move forward. The surface of the ribbed steel bars is also repeatedly exposed to the sandblasting gun during the forward movement, which facilitates the treatment of the iron oxide scale on its surface.

[0055] Preferably, the bottom of the sandblasting shell is a funnel-shaped sandblasting recovery chamber, and a conveyor belt is provided below the funnel-shaped sandblasting recovery chamber, so as to realize efficient and automated surface sandblasting treatment of ribbed steel bars, while being environmentally friendly, recyclable and reusable.

[0056] Preferably, the dust removal pipe is connected to a dust removal device with a suction bag filter for dust removal.

[0057] Preferably, the conveyor belt is equipped with a magnetic separator and a screening machine.

[0058] Preferably, the roller is made of nano-ceramic material, which is hard and impact-resistant.

[0059] Beneficial effects:

[0060] The beneficial effects of adopting the technical solution of this invention are as follows:

[0061] (1) Depending on the degree of corrosion of the ribbed steel bar surface, the corresponding sandblasting material is used to sandblast and clean the surface. This ensures that the surface of the ribbed steel bar is thoroughly treated, while avoiding damage to the surface of the ribbed steel bar caused by excessive impact force, and at the same time reducing the cost of using sandblasting material.

[0062] (2) Set up a basic image database and an auxiliary image database. The surface corrosion level of ribbed steel bars is determined by comparing multiple images. The auxiliary image database is updated as needed to improve the accuracy of the determination results.

[0063] (3) A rod with the same length direction as the rod conveyor is used, and a spiral convex line is set on its surface. The ribbed steel bar flips between the two rods and moves forward by friction between the longitudinal and transverse ribs of the ribbed steel bar and the spiral convex line on the surface of the rod, so as to realize the automatic flipping of the hot-rolled ribbed steel bar and its forward movement in the specified direction. Attached Figure Description

[0064] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0065] Figure 1 This is a process flow diagram of the preferred method for cleaning and sandblasting the surface of ribbed steel bars according to the present invention;

[0066] Figure 2 This is a schematic diagram of the preferred structure of the ribbed steel bar surface cleaning and sandblasting system of the present invention;

[0067] Figure 3 This is a preferred connection diagram between the sandblasting box and the sandblasting gun of the present invention;

[0068] Figure 4 This is a preferred connection diagram of the sandblasting material mixing tank and the sandblasting gun of the present invention;

[0069] Figure 5 This is a preferred control structure diagram of the ribbed steel bar surface cleaning and sandblasting system of the present invention;

[0070] Figure 6 This is a top view schematic diagram of a preferred bar roller conveyor of the present invention;

[0071] Figure 7 This is a schematic diagram of the preferred structure of the sandblasting rotating assembly of the present invention;

[0072] Figure 8 This is a schematic diagram of the preferred sandblasting gun structure of the present invention from a bottom view;

[0073] Figure 9 This is a side view of the internal structure of a preferred sandblasting gun according to the present invention. Detailed Implementation

[0074] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, 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 a part of the embodiments of the present invention, not all of them. 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 represent 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.

[0075] This embodiment uses appropriate sandblasting materials to clean the surface of the ribbed steel bars according to the different degrees of surface corrosion. This ensures thorough surface treatment of the ribbed steel bars while avoiding damage caused by excessive impact force, and also reduces the cost of using sandblasting materials. The specific technical solution is as follows:

[0076] A method for cleaning and sandblasting the surface of ribbed steel bars, wherein the ribbed steel bars are driven to rotate and move forward, and the length direction of the ribbed steel bars is the same as the transport direction;

[0077] Different sandblasting materials are selected to clean the surface of the ribbed steel bars according to the different degrees of corrosion. The different degrees of corrosion on the ribbed steel bar surface are divided into three corrosion levels: severe corrosion, general corrosion, and slight corrosion. The correspondence between these levels and the sandblasting materials is as follows:

[0078] For severe corrosion, the appropriate sandblasting material is: 88%-92% corundum refractory brick crushed material and 8%-12% steel slag washed steel pellets, with a particle diameter of 1 mm-5 mm.

[0079] For general rust, the appropriate sandblasting material is: 93%-97% corundum refractory brick crushed material and 2%-7% steel slag washed steel pellets, with a particle diameter of 1 mm-5 mm.

[0080] For slight rust, the appropriate blasting material is: over 99% corundum refractory brick pulverized material and less than 1% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm.

[0081] As a preferred embodiment, the correspondence between different degrees of corrosion on the surface of the ribbed steel bars and the sandblasting material is as follows:

[0082] For severe corrosion, the appropriate sandblasting material is: 90% corundum refractory brick crushed material and 10% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm.

[0083] For general rust, the appropriate sandblasting material is: 95% corundum refractory brick crushed material and 5% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm.

[0084] For minor rust, the appropriate blasting material is 100% corundum refractory brick powder with a particle diameter of 1 mm to 5 mm.

[0085] Here, severe corrosion means that the surface of the ribbed steel bar is severely corroded and the surface iron oxide scale is thick; general corrosion means that the surface of the ribbed steel bar is generally corroded and the surface iron oxide scale is of average thickness; slight corrosion means that the surface of the ribbed steel bar is slightly corroded, and no iron scale has formed on the surface or the iron scale is very thin.

[0086] As a preferred implementation method, such as Figure 1 As shown, the sandblasting method for cleaning the surface of ribbed steel bars in this embodiment includes the following steps:

[0087] Step S101: Drive the ribbed steel bar to rotate and move forward, wherein,

[0088] A first ribbed steel bar surface inspection device and a sandblasting machine are arranged in front and behind each other in the direction of transport of ribbed steel bars. The sandblasting machine is equipped with a sandblasting gun for sandblasting the surface of the ribbed steel bars.

[0089] Step S102: After receiving the surface image of the ribbed steel bar captured by the first ribbed steel bar surface detection device, compare it with the image in the standard image database to determine the corrosion level of the ribbed steel bar surface.

[0090] Step S103: Based on the determined surface rust level of the ribbed steel bar, control the valve to open so that the sandblasting gun sprays out the corresponding sandblasting material to clean the surface of the ribbed steel bar.

[0091] A standard image database is established, and the surface images of the ribbed steel bars are captured by the first ribbed steel bar surface detection device 5. The images are then compared with those in the standard image database 42 to determine the surface corrosion level of the ribbed steel bar 100. Based on the corrosion level, the corresponding sandblasting material is used for sandblasting treatment, thereby achieving automated sandblasting cleaning and solving the problem of incomplete rust cleaning of the ribbed steel bar surface.

[0092] As a preferred implementation method, such as Figure 2 and 3 As shown, the sandblasting machine 2 is equipped with a sandblasting gun 22 and three sandblasting boxes 24. Each sandblasting box 24 is connected to the sandblasting gun 22 through a pipe. Each pipe connecting the sandblasting box 24 and the sandblasting gun 22 is equipped with a control valve 25. The three sandblasting boxes 24 contain sandblasting materials corresponding to three rust levels: severe rust, general rust, and slight rust.

[0093] At this point, in step S103, after determining the rust level of the ribbed steel bar surface, the control valve 25 connected to the corresponding sandblasting box is opened, so that the sandblasting gun sprays out the corresponding sandblasting material to sandblast and clean the surface of the ribbed steel bar.

[0094] As a preferred implementation method, such as Figure 2 and 4 As shown, the sandblasting machine 2 is equipped with a sandblasting material mixing box 26, and a stirrer (not shown in the figure) is installed inside the sandblasting material mixing box 26. A first sandblasting material box 27 and a second sandblasting material box 28 are connected to the inlet of the sandblasting material mixing box 26. The first sandblasting material box 27 is filled with corundum refractory brick crushed material, and the second sandblasting material box 28 is filled with steel slag washed steel pellets. A first powder metering valve 271 is installed on the pipeline between the sandblasting material mixing box 26 and the first sandblasting material box 27, and a second powder metering valve 281 is installed on the pipeline between the sandblasting material mixing box 26 and the second sandblasting material box 28.

[0095] In a preferred embodiment, in step S102, as follows: Figure 5 As shown, the standard image database 42 includes at least a basic image database 421 and an auxiliary image database 422. The basic image database 421 stores N1 basic reference images for each rust level of the ribbed steel bar surface, and the auxiliary image database 422 stores N2 basic reference images for each rust level of the ribbed steel bar surface, where 1 ≤ N1 ≤ 5, 3 ≤ N2 ≤ 10, and 2N1 ≤ N2 ≤ 5N1; for example, N1 is 3 and N2 is 8. An image recognition threshold is set, and the captured images of the ribbed steel bar surface are compared one by one with the images in the basic image database and the auxiliary image database. Images above the threshold are considered similar, while images below the threshold are considered dissimilar.

[0096] When the similarity rate between the image and the corresponding image in the basic image database 421 and the auxiliary image database 422 exceeds 90%, and the similarity rate between the images in the basic image database exceeds 50%, the image is marked as the corresponding corrosion level.

[0097] When the grade marking of the captured ribbed steel bar surface image is not unique or there is no grade marking, the user is prompted to update and adjust the image in the standard image database.

[0098] Before entering the sandblasting machine, take M images of the surface of the ribbed steel bar 100 at intervals, and compare them one by one with the images in the basic image database 421 and the auxiliary image database 422. When all the obtained grade marks are the same, it is determined to be the corresponding corrosion grade, where 3≤M≤10.

[0099] When the obtained grade markings are different, and one grade marking accounts for more than 80%, it is determined to be the corrosion grade, and the surface image of the ribbed steel bar that does not have the grade marking is saved to the image database 424 to be analyzed.

[0100] When the obtained grade markings are inconsistent, and one grade marking accounts for no more than 80% of the total, the user is prompted to update and adjust the images in the standard image database. A basic image database and an auxiliary image database are set up. The surface corrosion grade of the ribbed steel bars is determined by comparing multiple images taken. The auxiliary image database 422 is updated as needed to improve the accuracy of the determination results.

[0101] As a preferred embodiment, a second ribbed steel bar surface detection device 6 is installed at the rear end of the sandblasting machine 2 to take pictures of the surface of the ribbed steel bar 100 after sandblasting, to judge whether the surface rust removal is thorough and whether the surface of the ribbed steel bar has been damaged due to excessive impact force. Based on the results, the proportion of sandblasting material and the pictures in the standard image database are adjusted to provide feedback.

[0102] In a preferred embodiment, in step S102, the image database 424 to be analyzed is analyzed. If the image is deleted because of an error in the shooting process or because of inconsistent corrosion of the ribbed steel bars, the image is deleted. If the image is deleted because of an error in the comparison mark, the image is saved to the auxiliary image database to replace the image with the lowest comparison accuracy.

[0103] When the similarity rate between the image and the corresponding level image in the basic image database 421 and the auxiliary image database 422 is 100%, the image is saved to the auxiliary image database 422 to replace the image with the lowest comparison accuracy.

[0104] The number of times W1 is found to be dissimilar to the photographed image of the ribbed steel bar surface, but the image grade label is the same as that of the image in the standard image database; the number of times W2 is found to be similar to the photographed image of the ribbed steel bar surface, but the image grade label is different from that of the image in the standard image database; and the total number of comparisons with the photographed image of the ribbed steel bar surface is W. Then the comparison accuracy P of the images in the standard image database is:

[0105] P=(W-W1-W2) / W 100%.

[0106] like Figure 3 and 4 As shown, this embodiment also provides a sandblasting system employing the above-described sandblasting method, including a roller conveyor 1 and a sandblasting machine 2; the sandblasting machine 2 includes a sandblasting housing 21, a sandblasting gun 22, and a dust removal pipe 23. The sandblasting housing 21 is fixedly installed on the roller conveyor 1, and the sandblasting gun 22 and the dust removal pipe 23 are located inside the sandblasting housing 21 above the roller conveyor 1, for sandblasting to remove surface iron oxide scale from the ribbed steel bars 100 during rotational transport.

[0107] The bar roller conveyor 1 is equipped with a drive mechanism 3 for controlling the operation of the bar roller conveyor 1;

[0108] like Figure 2 and 4 As shown, the sandblasting machine 2 is equipped with a sandblasting gun 22 and three sandblasting boxes 24. Each sandblasting box 24 is connected to the sandblasting gun 22 through a pipe. Each pipe connecting the sandblasting box 24 and the sandblasting gun 22 is equipped with a control valve 25. The three sandblasting boxes 24 contain sandblasting materials corresponding to three rust levels: severe rust, general rust, and slight rust.

[0109] As a preferred implementation method, such as Figure 4 As shown, it also includes a control center 4. A first ribbed steel bar surface detection device 5 is also installed on the roller conveyor 1 in front of the sandblasting machine 2. The output end of the control center 4 is connected to the control valve 25 and the drive mechanism 3. The output end of the first ribbed steel bar surface detection device 5 is connected to the input end of the control center 4.

[0110] In a preferred embodiment, the first ribbed steel bar surface detection device 5 is a CCD camera, and the control center 4 is equipped with an image recognition module 41, a standard image database 42 and a valve control module 43. The output end of the CCD camera is connected to the input end of the image recognition module 41.

[0111] The image recognition module 41 is used to compare the image received from the CCD camera with the image in the standard image database 42 and determine the surface corrosion level of the ribbed steel bar 100.

[0112] The valve control module 43 is used to open the control valve 25 between the sandblasting box 24 and the sandblasting gun 22 according to the surface corrosion level of the ribbed steel bar 100 determined by the image recognition module 41.

[0113] For controlling the proportion of sandblasting material, it is also possible to... Figure 3 As shown, the sandblasting machine 2 is equipped with a sandblasting material mixing box 26, and a stirrer (not shown in the figure) is installed inside the sandblasting material mixing box 26. A first sandblasting material box 27 and a second sandblasting material box 28 are connected to the inlet of the sandblasting material mixing box 26. The first sandblasting material box 27 contains corundum refractory brick crushed material, and the second sandblasting material box 28 contains steel slag washed steel pellets. A first powder metering valve 271 is installed on the pipeline between the sandblasting material mixing box 26 and the first sandblasting material box 27, and a second powder metering valve 281 is installed on the pipeline between the sandblasting material mixing box 26 and the first sandblasting material box 28. The control valve 25 is installed between the sandblasting material mixing box 26 and the sandblasting gun 22.

[0114] The input terminals of the first powder metering valve 271 and the second powder metering valve 281 are connected to the output terminal of the valve control module 43.

[0115] As a preferred embodiment, a second ribbed steel bar surface detection device 6 is installed at the rear end of the sandblasting machine 2 to take pictures of the surface of the ribbed steel bar 100 after sandblasting, to judge whether the surface rust removal is thorough and whether the surface of the ribbed steel bar has been damaged due to excessive impact force. Based on the results, the proportion of sandblasting material and the pictures in the standard image database are adjusted to provide feedback.

[0116] In a preferred embodiment, the second ribbed steel bar surface inspection device 6 is a CCD camera, the output of which is connected to the control center. The standard image database 42 also includes a post-blasting image database 423. The image recognition module 41 compares the images captured by the second ribbed steel bar surface inspection device 6 with the images in the post-blasting image database 423 to determine whether the blasting is qualified. If it is not qualified, it feeds back to the control center 4 to adjust the blasting material and the standard image database.

[0117] In a preferred embodiment, the bottom of the sandblasting shell 21 is a funnel-shaped sandblasting recovery chamber 211, and a conveyor belt 212 is provided below the funnel-shaped sandblasting recovery chamber 211. A magnetic separator and a screening machine are provided on the conveyor belt 212, so as to realize efficient and automated surface sandblasting treatment of ribbed steel bars, while being environmentally friendly, recyclable and reusable.

[0118] In a preferred embodiment, the roller conveyor 1 includes several rows of rollers 11 arranged along the length of the roller conveyor 1. Each row of rollers 11 includes several rollers 11 arranged perpendicular to the length of the roller conveyor 1. The rollers 11 are uniformly distributed with helical convex lines 111. The driving mechanism 3 directly or indirectly drives all the rollers 11 to rotate.

[0119] In a preferred embodiment, each of the rollers 11 is provided with a first gear (not shown in the figure) near the end of the drive mechanism 3, and the drive mechanism 3 directly or indirectly drives the first gear to rotate.

[0120] When the row of rollers 11 is located at the end away from the drive mechanism 3, at least one of the rollers 11 in that row is provided with a second gear (not shown in the figure) at the end away from the drive mechanism 3.

[0121] When the roller 11 is located near one end of the drive mechanism 3, the first gear of the roller 11 is driven by at least one second gear on the roller 11 in the preceding row.

[0122] In a preferred embodiment, the roller conveyor 1 has a plurality of rotating shafts 12 arranged along a direction perpendicular to the length of the roller conveyor 1, and a plurality of rollers 11 are evenly distributed along the length of each rotating shaft 12. A conveyor frame 10 is installed between two adjacent rollers 11 on the same rotating shaft 12, and a row of rollers 11 is formed between two adjacent conveyor frames 10.

[0123] Each of the rotating shafts 12 has a first gear at one end near the drive mechanism 3.

[0124] In a preferred embodiment, the drive mechanism 3 includes a drive motor 31, a drive wheel 32, and a gearbox pulley 33. The drive wheel 32 is centrally fixed on the rotating shaft of the drive motor 31. The gearbox pulley 33 is centrally mounted on the gearbox 35 of the transport frame 10 via a main drive shaft 34. The drive wheel 32 and the gearbox pulley 33 are connected by a V-belt 36. The other end of the main drive shaft 34 is connected to a transmission gear (not shown in the figure), which directly or indirectly drives the first gear to rotate.

[0125] The drive mechanism drives the rollers to rotate in the same direction, causing the ribbed steel bars located between two adjacent rollers to rotate and move forward. The surface of the ribbed steel bars is also repeatedly exposed to the sandblasting gun during the forward movement, which facilitates the treatment of the iron oxide scale on its surface.

[0126] In a preferred embodiment, the dust removal duct 23 is connected to a dust removal device with a suction bag filter for dust removal.

[0127] In a preferred embodiment, the roller 11 is made of nano-ceramic material, which is hard and impact-resistant.

[0128] As a preferred embodiment, since the ribbed steel bar has raised ribs on its surface, cleaning the iron oxide scale on its surface requires sandblasting the surface of the ribbed steel bar from different angles, and the rotation of the sandblasting gun can be controlled here. For example... Figure 7 As shown, it also includes a sandblasting rotation assembly 7 for controlling the rotation of the sandblasting guns. The sandblasting rotation assembly 7 includes a rotary motor 71 and a sandblasting rotation shaft 72. The rotary motor 71 is fixedly mounted on the sandblasting housing 21. A plurality of sandblasting guns 22 are evenly distributed along the length of the sandblasting rotation shaft 72. The sandblasting rotation shaft 72 is rotatably mounted on the sandblasting housing 21 through bearings. The rotary motor can control the sandblasting guns 22 to rotate periodically along the sandblasting rotation shaft 72 at a certain angle, thereby improving the surface cleaning effect.

[0129] The sandblasting gun is designed so that while it swings back and forth driven by the sandblasting rotation shaft 72, it also performs a regular left-right swing, such as... Figure 8 and 9 As shown, the sandblasting gun 22 includes a sandblasting gun housing 221 and a sandblasting gun body 222. The sandblasting gun housing 221 is fitted over the sandblasting gun body 222, and a buffer layer 223 is filled between the outer wall of the sandblasting gun body and the inner wall of the sandblasting gun housing 221. Several buffer springs 224 are distributed in the buffer layer 223 along the circumferential direction.

[0130] In order to generate a left-right swinging force during the back-and-forth swinging of the sandblasting gun body 222, a tower-shaped spring 225 is provided around the outer circumference of the sandblasting gun body 222. The two ends of the tower-shaped spring are fixed to the inner wall of the sandblasting gun housing 221. During the back-and-forth swinging of the sandblasting gun body 222, both the buffer spring 224 and the tower-shaped spring 225 are deformed. While providing a restoring force for the back-and-forth swinging of the sandblasting gun body 222, they also provide a certain restoring force in the left-right direction, so that it swings left and right in a regular manner.

[0131] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the invention by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the invention should be included within the scope of protection of the invention.

Claims

1. A method for sandblasting to clean the surface of ribbed steel bars, characterized in that, The ribbed steel bar is driven to rotate forward, with the length direction of the ribbed steel bar being the same as the transport direction. Different sandblasting materials are selected to clean the surface of the ribbed steel bars according to the different degrees of corrosion. The different degrees of corrosion on the ribbed steel bar surface are divided into three corrosion levels: severe corrosion, general corrosion, and slight corrosion. The correspondence between these levels and the sandblasting materials is as follows: For severe corrosion, the appropriate sandblasting material is: 88%-92% corundum refractory brick crushed material and 8%-12% steel slag washed steel pellets, with a particle diameter of 1 mm-5 mm. For general rust, the appropriate sandblasting material is: 93%-97% corundum refractory brick crushed material and 2%-7% steel slag washed steel pellets, with a particle diameter of 1 mm-5 mm. For minor rust, the appropriate blasting material is: over 99% corundum refractory brick crushed material and less than 1% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm. It also includes the following steps, Step one: Drive the ribbed steel bar to rotate and move forward, whereby... A first ribbed steel bar surface inspection device and a sandblasting machine are set up in front and behind the ribbed steel bar transport direction. The sandblasting machine is equipped with a sandblasting gun and three sandblasting boxes. Each sandblasting box is connected to the sandblasting gun through a pipe. A control valve is installed on the pipe connecting each sandblasting box and the sandblasting gun. The three sandblasting boxes are respectively filled with sandblasting materials corresponding to three rust levels: severe rust, general rust, and slight rust. Step 2: After receiving the surface image of the ribbed steel bar captured by the first ribbed steel bar surface detection device, compare it with the image in the standard image database to determine the corrosion level of the ribbed steel bar surface. Step 3: Based on the determined surface rust level of the ribbed steel bars, control the opening of the control valve connected to the corresponding sandblasting box to sandblast the surface of the ribbed steel bars. In step two, the standard image database includes at least a basic image database and an auxiliary image database. The basic image database contains N1 basic reference images for each rust level of the ribbed steel bar surface, and the auxiliary image database contains N2 basic reference images for each rust level of the ribbed steel bar surface, wherein 1≤N1≤5, 3≤N2≤10, and 2N1≤N2≤5N1. Set an image recognition threshold and compare the captured images of the ribbed steel bar surface with images in the basic image database and auxiliary image database one by one. If the value is higher than the threshold, it means that they are similar, and if it is lower than the threshold, they are not similar. When the similarity rate between the image and the corresponding image in the basic image database and the auxiliary image database exceeds 90%, and the similarity rate between the image and the basic image database exceeds 50%, it is marked as the corresponding corrosion level. When the grade marking of the captured ribbed steel bar surface image is not unique or there is no grade marking, the user is prompted to update and adjust the image in the standard image database. Before entering the sandblasting machine, take M images of the ribbed steel bar surface at intervals, and compare them one by one with the images in the basic image database and the auxiliary image database. When all the obtained grade marks are the same, it is determined to be the corresponding corrosion grade, where 3≤M≤10. When the obtained grade markings are different, and one grade marking accounts for more than 80%, it is determined to be the corrosion grade, and the surface image of the ribbed steel bar that does not have the grade marking is saved to the image database to be analyzed. When the obtained grade labels are different, and one grade label accounts for no more than 80%, the user is prompted to update and adjust the images in the standard image database.

2. The method for sandblasting and cleaning the surface of ribbed steel bars according to claim 1, characterized in that, The relationship between different degrees of corrosion on the surface of ribbed steel bars and sandblasting materials is as follows: For severe corrosion, the appropriate sandblasting material is: 90% corundum refractory brick crushed material and 10% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm. For general rust, the appropriate sandblasting material is: 95% corundum refractory brick crushed material and 5% steel slag washed steel pellets, with a particle diameter of 1 mm to 5 mm. For minor rust, the appropriate blasting material is 100% corundum refractory brick powder with a particle diameter of 1 mm to 5 mm.

3. The method for sandblasting and cleaning the surface of ribbed steel bars according to claim 1, characterized in that, In step two, the image database to be analyzed is analyzed. If the image is deleted because of an error in the shooting process or because of inconsistent corrosion of the ribbed steel bars, the image is deleted. If the error is due to an error in the comparison mark, the image is saved to the auxiliary image database to replace the image with the lowest comparison accuracy. When the similarity rate between the image and the corresponding level image in the basic image database and the auxiliary image database is 100%, the image is saved to the auxiliary image database to replace the image with the lowest comparison accuracy. The number of times W1 is found to be dissimilar to the photographed image of the ribbed steel bar surface, but the image grade label is the same as that of the image in the standard image database; the number of times W2 is found to be similar to the photographed image of the ribbed steel bar surface, but the image grade label is different from that of the image in the standard image database; and the total number of comparisons with the photographed image of the ribbed steel bar surface is W. Then the comparison accuracy P of the images in the standard image database is: P=(W-W1-W2) / W 100%。 4. A sandblasting system employing the sandblasting method as described in any one of claims 1-3, characterized in that, The system includes a roller conveyor and a sandblasting machine. The sandblasting machine includes a sandblasting housing, a sandblasting gun, and a dust removal pipe. The sandblasting housing is fixedly installed on the roller conveyor. The sandblasting gun and the dust removal pipe are located inside the sandblasting housing above the roller conveyor. The roller conveyor is equipped with a drive motor for controlling the operation of the roller conveyor. The sandblasting machine is equipped with a sandblasting gun and three sandblasting chambers. Each sandblasting chamber is connected to the sandblasting gun via a pipe. Each pipe connecting the sandblasting chamber to the sandblasting gun is equipped with a control valve. The three sandblasting chambers contain sandblasting materials corresponding to three rust levels: severe rust, general rust, and slight rust.

5. The blasting system for cleaning the surface of ribbed steel bars according to claim 4, characterized in that, It also includes a control center, and a first ribbed steel bar surface detection device is installed on the roller conveyor in front of the sandblasting machine. The output end of the control center is connected to the control valve and the drive motor; the output end of the first ribbed steel bar surface detection device is connected to the input end of the control center.

6. The blasting system for cleaning the surface of ribbed steel bars according to claim 5, characterized in that, The first ribbed steel bar surface detection device is a CCD camera. The control center is equipped with an image recognition module, a standard image database and a valve control module. The output end of the CCD camera is connected to the input end of the image recognition module. The image recognition module is used to compare the received image transmitted from the CCD camera with the image in the standard image database and determine the surface corrosion level of the ribbed steel bar. The valve control module is used to open the control valve between the corresponding sandblasting box and the sandblasting gun based on the surface corrosion level of the ribbed steel bar determined by the image recognition module.

7. The blasting system for cleaning the surface of ribbed steel bars according to claim 4, characterized in that, The bottom of the sandblasting shell is a funnel-shaped sandblasting recovery chamber, and a conveyor belt is installed below the funnel-shaped sandblasting recovery chamber. A magnetic separator and a screening machine are installed on the conveyor belt.

8. The blasting system for cleaning the surface of ribbed steel bars according to claim 4, characterized in that, The bar and roller conveyor includes several rows of bar and rollers arranged along the length of the bar and roller conveyor. Each row of bar and rollers includes several bar and rollers arranged perpendicular to the length of the bar and roller conveyor. The bar and rollers are evenly distributed with spiral convex lines. The drive motor directly or indirectly drives all the bar and rollers to rotate.

Images