Efficient hot-rolled plate rust removal device and process

Abstract

The application discloses a high-efficiency hot-rolled plate rust removal device and process, which comprises uncoiling devices, abrasive water jet devices, pickling devices and coiling devices arranged in sequence; the uncoiling devices are used for straightening the bent plate; the abrasive water jet devices are used for preliminarily removing rust from both sides of the plate, and the abrasive water jet devices comprise abrasive water jet guns and high-pressure water jet guns, and the abrasive water jet guns are arranged close to the uncoiling devices; the pickling devices comprise pickling tanks and water washing tanks, the pickling tanks are used for pickling and rust removal of the plate, and the water washing tanks are used for water washing of the plate after the pickling and rust removal; and the coiling devices are used for coiling the plate after the water washing. The application combines the advantages of the abrasive water jet and the pickling device, compared with the traditional hydrochloric acid pickling and the abrasive water jet rust removal device, the rust removal is more complete and thorough, the plate removed of rust by the environment-friendly acid is not prone to rust returning, the cost of recycling the acid is low, the processing capacity is large, the irritating odor is not easy to be emitted, and the application is environment-friendly.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metallurgical engineering, and particularly relates to a high-efficiency hot-rolled plate rust removal device and process. BACKGROUND

[0002] Steel is exposed to the air, because there is water and oxygen in the air, so the steel will rust, thereby greatly affecting the use and sale of the steel. However, rusting of the steel is inevitable, unless placed in a vacuum area, of course, it is not realistic, so finding a rust removal device with good rust removal performance and low cost and process becomes a problem to be solved.

[0003] The existing rust removal process includes chemical rust removal and physical rust removal, wherein the chemical rust removal generally refers to pickling and the like, but such methods will cause various shortcomings: first, the chemical method itself has certain damage to the iron base, has strict requirements on the rust removal time, and improper time control will cause poor rust removal effect or excessive rust removal damage to the iron base; second, with the gradual increase of environmental protection awareness, the pollution of chemical drugs should be gradually reduced; third, the chemical method such as pickling, the volatile substances in the acid can cause harm to the human body, and the like, so the physical method of rust removal becomes the mainstream rust removal method. The physical rust removal method mainly includes high-pressure water jet, sand blasting, shot blasting and the like.

[0004] At present, the application scene of high-pressure water jet is more and more extensive, mainly including high-pressure pure water jet method and high-pressure abrasive water jet method. The high-pressure water jet mainly uses a pressurizing pump to pressurize the water to a certain pressure value, and directly sprays the water on the material to be rusted by using a spray gun, so as to achieve the purpose of rust removal. However, using only pure water will have the shortcomings of incomplete rust removal and large noise in the rust removal process. The abrasive water jet method uses abrasive and water to mix in a bin, and then pressurizes the mixture by using a pressurizing pump, and uniformly sprays the mixture on the material to be rusted, in this process, the rust on the iron base is stripped, so as to achieve the purpose of rust removal. However, the abrasive water jet has high requirements on the nozzle, because the abrasive will cause certain damage to the nozzle. The abrasive water jet method also has high requirements on the bin for storing the abrasive and the matching conveying pipe, so as to prevent blockage and affect the abrasive spraying.

[0005] At present, the pickling process generally uses hydrochloric acid and the like to perform pickling, such acid has short rust removal time, low price, and has become the preferred pickling raw material in many steel plants. However, such acid can easily emit a pungent odor, has high recovery cost, and can easily erode the iron base for a long pickling time. Therefore, the pickling process should develop in the direction of reducing environmental pollution, low recovery cost and small harm to the human body in the future development. SUMMARY

[0006] The present application aims at the deficiencies of the existing pickling process, and provides a high-efficiency hot-rolled plate rust removal device and process, so as to solve the problems of the existing pickling process.

[0007] To achieve the above object, the application provides a high-efficiency hot-rolled plate rust removal device, which comprises uncoiler, abrasive water jet device, pickling device and coiling device arranged in sequence.

[0008] The uncoiler is used for straightening the bent plate.

[0009] The abrasive water jet device is used for preliminarily removing rust from both sides of the plate, and comprises abrasive water jet spray gun and high-pressure water spray gun, wherein the abrasive water jet spray gun is arranged close to the uncoiler.

[0010] The pickling device comprises pickling tank and water washing tank, wherein the pickling tank is used for pickling and rust removal of the plate, and the water washing tank is used for water washing of the plate after rust removal.

[0011] The coiling device is used for coiling the plate after water washing.

[0012] Preferably, the number of the abrasive water jet spray guns arranged on one side of the plate is not less than 5, and the distance between two adjacent abrasive water jet spray guns is 5-10 mm.

[0013] Preferably, the abrasive water jet spray gun comprises water tank, material bin, pressurizing device and inner cavity of the abrasive water jet spray gun, wherein the water tank is communicated with the inner cavity of the abrasive water jet spray gun through the pressurizing device, and the material bin is communicated with the inner cavity of the abrasive water jet spray gun.

[0014] Preferably, the abrasive water jet spray gun is a front-mixing type spray gun, and the inner cavity of the abrasive water jet spray gun comprises a shell, wherein the inside of the shell is provided with abrasive inlet, high-pressure water inlet, mixing bin and nozzle, the central axis of the abrasive inlet intersects with the central axis of the high-pressure water inlet in the mixing bin, and the central axis of the high-pressure water inlet coincides with the central axis of the inlet end of the nozzle.

[0015] Preferably, the number of the high-pressure water spray guns arranged on one side of the plate is not less than 2, and the included angle between the high-pressure water spray gun and the plate is 45°.

[0016] Preferably, the medium sprayed by the abrasive water jet spray gun comprises water and abrasive, and the abrasive is quartz sand or diamond sand with particle size of 0.5 mm.

[0017] Preferably, the pickling tank comprises several water tanks arranged in sequence, and the water tank is provided with environment-friendly acid, wherein the acidity of the environment-friendly acid is not less than 10, and the composition of the environment-friendly acid comprises: citric acid 80-110 g / L, hydroxyethylidene diphosphonic acid 80-110 g / L, sodium gluconate 30-50 g / L, ethylenediaminetetraacetic acid disodium 15-20 g / L and polyethylene glycol 6-10 g / L.

[0018] Preferably, the length of the water tank is not less than 9m, and the length of the water washing tank is not less than 7m.

[0019] An efficient hot-rolled plate rust removal process uses an efficient hot-rolled plate rust removal device, comprising the following steps:

[0020] The bent plate is straightened by the rollers in the uncoiling device, and the plate feeding speed is controlled at 20m / min.

[0021] The plate is preliminarily rusted by the mixed high-pressure water material mixture sprayed by the abrasive water jet gun, and is washed by the high-pressure water gun.

[0022] The plate is pickled and rusted in the pickling tank, the pickling temperature in the pickling tank is 55℃, and the acidity of the environmentally-friendly acid in the pickling tank is not less than 10.

[0023] The plate after rust removal is washed in the water washing tank to remove the acid and rust remaining on the plate.

[0024] Finally, the plate after rust removal is coiled by the coiling device.

[0025] Preferably, the distance between the abrasive water jet gun and the plate is 5mm-10mm, and the mixed pressure of the mixed high-pressure water material mixture sprayed by the abrasive water jet gun in the mixing bin is 20MPa-40MPa.

[0026] Compared with the prior art, the present application has the following advantages and technical effects:

[0027] The efficient hot-rolled plate rust removal device provided by the present application combines the advantages of the abrasive water jet and the pickling device, can completely remove rust, does not cause great damage to the hot-rolled plate, is friendly to the environment, does not produce a particularly strong irritating odor in actual production, the acid can be recycled, the recycling cost is low, and a new research idea is provided for the environmental protection and saving of hot-rolled plate rust removal. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0029] Fig. 1 It is a structural schematic diagram of the hot-rolled plate rust removal device of the present application.

[0030] Fig. 2This is a schematic diagram of the structure of the abrasive waterjet spray gun of the present invention;

[0031] Fig. 3 This is a schematic diagram of the internal cavity of the abrasive waterjet spray gun of the present invention;

[0032] In the diagram: 1. Uncoiling device; 2. Roll; 3. Abrasive waterjet device; 4. Abrasive waterjet spray gun; 5. High-pressure water spray gun; 6. Pickling device; 7. Pickling tank; 8. Washing tank; 9. Winding device; 10. Roll; 11. Water tank; 12. Hopper; 13. Pressurizing device; 14. Inner cavity of abrasive waterjet spray gun; 15. Abrasive inlet; 16. High-pressure water inlet; 17. Mixing hopper; 18. Nozzle. Detailed Implementation

[0033] It should be noted that, unless otherwise specified, the embodiments and features described in this invention can be combined with each other. The described embodiments are merely some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention. The invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0034] like Figs. 1 to 3 As shown, the present invention provides a high-efficiency hot-rolled plate rust removal device, comprising an uncoiling device 1, an abrasive water jet device 3, an acid pickling device 6, and a coiling device 9 arranged in sequence.

[0035] The uncoiling device 1 is used to straighten bent sheet metal.

[0036] The abrasive water jet device 3 is used to perform preliminary rust removal on both sides of the plate. The abrasive water jet device 3 includes an abrasive water jet spray gun 4 and a high-pressure water spray gun 5. The abrasive water jet spray gun 4 is set close to the uncoiling device 1.

[0037] The pickling device 6 includes a pickling tank 7 and a washing tank 8. The pickling tank 7 is used to pickle and remove rust from the plate, and the washing tank 8 is used to wash the plate after pickling and rust removal.

[0038] The winding device 9 is used to wind up the washed sheet material.

[0039] To further optimize the design, the number of abrasive waterjet spray guns 4 set on one side of the board shall not be less than 5, and the distance between two adjacent abrasive waterjet spray guns 4 shall be 5mm to 10mm.

[0040] The design is further optimized. The abrasive waterjet spray gun 4 includes a water tank 11, a material bin 12, a pressurizing device 13, and an abrasive waterjet spray gun inner cavity 14. The water tank 11 is connected to the abrasive waterjet spray gun inner cavity 14 through the pressurizing device 13, and the material bin 12 is connected to the abrasive waterjet spray gun inner cavity 14.

[0041] Further optimization scheme, the abrasive water jet spray gun 4 is a front mixing type spray gun, the abrasive water jet spray gun inner cavity 14 includes a shell, the inside of the shell is provided with abrasive inlet 15, high pressure water inlet 16, mixing bin 17 and nozzle 18, the central axis of abrasive inlet 15 and the central axis of high pressure water inlet 16 intersect in mixing bin 17, and the central axis of high pressure water inlet 16 coincides with the central axis of the inlet end of nozzle 18.

[0042] The abrasive water jet spray gun 4 adopted in the present application can not only make the abrasive better mixed into the high-pressure water, avoiding the accumulation of the abrasive in the mixing bin 13, but also ensure the water depth of the high-pressure water mixed with the abrasive, thereby ensuring the cleaning effect on the rust on the plate.

[0043] Further optimization scheme, the number of high-pressure water spray guns 5 arranged on one side of the plate is not less than 2, and the included angle between the high-pressure water spray gun 5 and the plate is 45°.

[0044] Further optimization scheme, the medium sprayed by the abrasive water jet spray gun 4 includes water and abrasive, and the abrasive is quartz sand or emery with a particle size of 0.5 mm.

[0045] Further optimization scheme, the pickling tank 7 includes a plurality of water tanks arranged in series, and the water tank is provided with an environmentally friendly acid with an acidity of not less than 10, and the composition of the environmentally friendly acid includes: citric acid 80-110 g / L, hydroxyethylidene diphosphonic acid 80-110 g / L, sodium gluconate 30-50 g / L, ethylenediaminetetraacetic acid disodium 15-20 g / L, and polyethylene glycol 6-10 g / L.

[0046] Further optimization scheme, the length of the water tank is not less than 9 m, and the length of the water washing tank 8 is not less than 7 m.

[0047] An efficient hot-rolled plate rust removal process uses an efficient hot-rolled plate rust removal device, including the following steps:

[0048] The bent plate is straightened by the roller 2 in the uncoiling device 1, and the plate feeding speed is controlled at 20 m / min;

[0049] The mixed high-pressure water mixture sprayed by the abrasive water jet spray gun 4 is used to preliminarily remove rust from the plate, and the high-pressure water spray gun 5 is used to flush the plate; in this process, the particle size of the abrasive is controlled to be 0.5 mm, and the abrasive sprayed by the abrasive water jet spray gun 4 can cause the plate to vibrate slightly when it hits the plate, which helps the rust to fall off; if the particle size of the abrasive is too large, it can easily cause damage to the plate under high pressure, and if the particle size of the abrasive is too small, it can achieve a certain rust removal effect, but it cannot make the plate vibrate to a certain amplitude, which is not conducive to the rust falling off from the plate.

[0050] The plate is subjected to pickling rust removal by using the pickling tank 7, the pickling temperature in the pickling tank is 55 DEG C, and the acidity of the environment-friendly acid in the pickling tank 7 is controlled to be not less than 10;

[0051] The plate subjected to pickling rust removal is subjected to water washing by using the water washing tank 8, and the acid and rust remaining on the plate are removed, the water needs to be replaced after the iron ions in the water washing tank are accumulated to a certain degree;

[0052] Finally, the plate subjected to rust removal is coiled by the coiling device 9.

[0053] Further optimization scheme, the distance between the abrasive water jet gun 4 and the plate is 5mm-10mm, the mixing pressure of the mixed high-pressure water material mixture sprayed by the abrasive water jet gun 4 in the mixing bin 17 is 20MPa-40MPa.

[0054] Example 1

[0055] A Q235 hot-rolled plate is taken;

[0056] The hot-rolled plate is opened by using the opening device 1, and the roller 2 in the opening device 1 is used to straighten the plate;

[0057] The feeding speed of the plate is set to 20m / min, the plate is subjected to preliminary rust removal treatment by the upper and lower symmetrical abrasive water jet guns 4, and the pressure in the gun is 40MPa; then the abrasive and rust remaining on the plate are sprayed off by the high-pressure water gun with the same pressure;

[0058] Then, the plate enters the pickling part which is composed of four pickling tanks and one water washing tank, the acid in the pickling tank is environment-friendly acid, the plate enters the pickling tank and the water washing tank at a speed of 20m / min, and the water washing tank can wash off the rust and residual acid on the plate;

[0059] After the plate is subjected to water washing, the plate enters the coiling stage, the hot-rolled plate subjected to rust removal is coiled by the coiling machine through the roller 10 in the coiling machine, and the hot-rolled plate subjected to rust removal is obtained.

[0060] The present application combines the advantages of the abrasive water jet and the pickling device 6, can completely remove rust, does not cause great damage to the hot-rolled plate, is friendly to the environment, does not produce special irritating smell in actual production, and the acid can be recycled, and the recycling cost is low.

[0061] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this, any change or replacement easily thought of by those skilled in the art within the technical range disclosed by the present application should be covered in the protection scope of the present application.

Claims

1. A high efficient hot-rolled plate derusting device, characterized in that, It comprises uncoiling device (1), abrasive water jet device (3), pickling device (6) and coiling device (9) arranged in sequence. The uncoiling device (1) is used for straightening the bent plate; The abrasive water jet device (3) is used for preliminary rust removal on both sides of the plate, and the abrasive water jet device (3) comprises abrasive water jet spray gun (4) and high pressure water spray gun (5), the abrasive water jet spray gun (4) is arranged close to the uncoiling device (1); The pickling device (6) comprises pickling tank (7) and water washing tank (8), the pickling tank (7) is used for pickling and rust removal of the plate, and the water washing tank (8) is used for water washing of the plate after pickling and rust removal; The coiling device (9) is used for coiling the plate after water washing; The abrasive water jet spray gun (4) comprises water tank (11), stock bin (12), pressurizing device (13) and abrasive water jet spray gun inner cavity (14), the water tank (11) is communicated with the abrasive water jet spray gun inner cavity (14) through the pressurizing device (13), and the stock bin (12) is communicated with the abrasive water jet spray gun inner cavity (14); The abrasive water jet spray gun (4) is a front mixing type spray gun, the abrasive water jet spray gun inner cavity (14) comprises a shell, an abrasive inlet (15), a high pressure water inlet (16), a mixing stock bin (17) and a nozzle (18) are arranged in the shell, the center axis of the abrasive inlet (15) intersects with the center axis of the high pressure water inlet (16) in the mixing stock bin (17), and the center axis of the high pressure water inlet (16) coincides with the center axis of the inlet end of the nozzle (18); The pickling tank (7) comprises a plurality of water tanks arranged in sequence, the water tank is provided with environment-friendly acid, the acidity of the environment-friendly acid is not less than 10, and the composition of the environment-friendly acid comprises: citric acid 80-110g / L, hydroxyethylidene diphosphonic acid 80-110g / L, sodium gluconate 30-50g / L, ethylenediaminetetraacetic acid disodium 15-20g / L and polyethylene glycol 6-10g / L.

2. The efficient hot-rolled plate rust removal device according to claim 1, characterized by, The number of the abrasive water jet spray gun (4) arranged on one side of the plate is not less than 5, and the distance between adjacent two abrasive water jet spray guns (4) is 5-10mm.

3. The efficient hot-rolled plate rust removal device according to claim 1, characterized by, The number of the high pressure water spray gun (5) arranged on one side of the plate is not less than 2, and the included angle between the high pressure water spray gun (5) and the plate is 45°.

4. The efficient hot-rolled plate rust removal device according to claim 1, characterized by, The medium sprayed by the abrasive water jet spray gun (4) comprises water and abrasive, and the abrasive is quartz sand or corundum with a particle size of 0.5mm.

5. The efficient hot-rolled plate rust removal device according to claim 1, characterized by, The length of the water tank is not less than 9m, and the length of the water washing tank (8) is not less than 7m.

6. A high efficiency hot rolled plate derusting process characterized by, The high-efficiency hot-rolled plate rust removal device is used for the following steps: The bent plate is straightened by the roller (2) in the uncoiling device (1), and the feeding speed of the plate is controlled at 20m / min; The mixed high pressure water mixture sprayed by the abrasive water jet spray gun (4) is used for preliminary rust removal of the plate, and the high pressure water spray gun (5) is used for flushing the plate; The plate is pickled and rusted by using the pickling tank (7), the pickling temperature in the pickling tank is 55℃, and the acidity of the environmental protection acid in the pickling tank (7) is not less than 10; The plate after pickling and rust removal is washed by using the water washing tank (8), and the acid and rust remaining on the plate are removed; Finally, the plate after rust removal is coiled by the coiling device (9).

7. The efficient hot-rolled plate derusting process of claim 6, wherein, The distance between the abrasive water jet spray gun (4) and the plate is 5mm-10mm, and the mixing pressure of the mixed high-pressure water material mixture sprayed by the abrasive water jet spray gun (4) in the mixing bin (17) is 20MPa-40MPa.

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