Abrasive particle dynamic grading device and metal strip descaling assembly

Abstract

The application discloses a kind of abrasive particle size dynamic grading device and metal plate strip descaling assembly, abrasive particle size dynamic grading device includes pre-deposition tank, re-deposition tank, first cyclone separator, second cyclone separator, water pump, first bin, second bin and third bin, the liquid outlet of pre-deposition tank is communicated with in re-deposition tank, the liquid outlet of re-deposition tank and the top outlet of first cyclone separator are all communicated with the water inlet of water pump, the discharge port of pre-deposition tank and re-deposition tank is all communicated with the water outlet of water pump, the discharge port of pre-deposition tank is also communicated with the feed inlet of second cyclone separator, the discharge port of re-deposition tank is also communicated with the feed inlet of first cyclone separator, the bottom outlet of first cyclone separator is communicated with in third bin, the top outlet of second cyclone separator is communicated with in second bin, the bottom outlet of second cyclone separator is communicated with in first bin, so abrasive can be dynamically graded according to particle size and stored separately.

Description

Technical Field

[0001] This invention belongs to the field of abrasive jet technology, and particularly relates to an abrasive particle size dynamic classification device and a metal strip descaling assembly. Background Technology

[0002] During hot rolling or heat treatment, a dense coating of metal oxides forms on the surface of metallic materials. Because it cracks uniformly when bent, resembling fish scales, it is commonly called "scale skin." Abrasive jet descaling technology, as a method for removing scale, works on the principle of accelerating a mixture of water and abrasive to a certain speed and impacting the surface of the metal to be descaled. The scale is removed through the impact and grinding action of the abrasive, while the water acts as an auxiliary cleaning agent. To obtain a descaled surface with a certain roughness, the abrasive particle size needs to be maintained within a certain range. If the abrasive particle size is too large, the impact force is too great, and the surface roughness after descaling will exceed the upper limit; if the abrasive particle size is too small, the impact force will be insufficient, and the scale will be difficult to remove. The ideal abrasive particle size range requires: a small proportion of large-sized abrasive + a large proportion of medium-sized abrasive + as little small-sized abrasive as possible. In actual production, the abrasive is recycled until it gradually breaks down and wears down to a very small size (at which point it no longer has effective descaling ability) and is discharged from the system. Therefore, it is necessary to replenish the abrasive regularly to maintain a stable total amount of abrasive within the abrasive jet descaling system, thereby ensuring continuous production. The general method for replenishing abrasive is based on the abrasive consumption during production (such as statistical hourly consumption or consumption per ton of steel). However, this method presents the following contradictions with the ideal abrasive particle size range: it is difficult to accurately determine the appropriate addition time. If the addition time is too early, a large influx of new abrasive before the existing abrasive in the system is fully utilized not only leads to abrasive waste but also causes a sudden change in descaling quality—a sharp increase in surface roughness. If the addition time is too late, larger abrasive particles are not replenished in time, resulting in a decline in descaling quality, leading to scale residue and insufficient surface roughness. Both of these can result in the production of defective products. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, one of the objectives of the present invention is to provide an abrasive particle size dynamic classification device that can dynamically classify used abrasives according to their particle size.

[0004] To achieve the above objectives, the technical solution of the present invention is as follows: A dynamic particle size classification device for abrasives includes a pre-sedimentation tank, a re-sedimentation tank, a first hydrocyclone separator, a second hydrocyclone separator, a water pump, a first material tank, a second material tank, and a third material tank. The pre-sedimentation tank is used to hold a mixture of abrasives and water. The outlet of the pre-sedimentation tank is connected to the interior of the re-sedimentation tank. The outlet of the re-sedimentation tank and the top outlet of the first hydrocyclone separator are both connected to the inlet of the water pump. The slag discharge ports of the pre-sedimentation tank and the re-sedimentation tank are both connected to the outlet of the water pump. The slag discharge port of the pre-sedimentation tank is also connected to the inlet of the second hydrocyclone separator. The slag discharge port of the re-sedimentation tank is also connected to the inlet of the first hydrocyclone separator. The bottom outlet of the first hydrocyclone separator is connected to the interior of the third material tank. The top outlet of the second hydrocyclone separator is connected to the interior of the second material tank. The bottom outlet of the second hydrocyclone separator is connected to the interior of the first material tank.

[0005] The beneficial effects of the above technical solution are as follows: the abrasive discharged from the slag outlet of the pre-sedimentation tank can be classified by the second hydrocyclone separator. The abrasive discharged from the bottom outlet of the second hydrocyclone separator is the largest particle size abrasive, which is collected in the first material box. The abrasive discharged from the top outlet of the second hydrocyclone separator is the medium particle size abrasive, which is collected in the second material box. The re-sedimentation tank settles the abrasive in the water discharged from the liquid outlet of the pre-sedimentation tank and separates it by the first hydrocyclone separator. The abrasive discharged from the bottom outlet of the first hydrocyclone separator is the smallest particle size abrasive, which is collected in the third material box. The water discharged from the top outlet of the first hydrocyclone separator is water. The classification is simple and the classified abrasive can be stored separately. When the abrasive at the slag outlet of the pre-sedimentation tank and the re-sedimentation tank is transported to the corresponding first hydrocyclone separator and second hydrocyclone separator, the water pumped by the water pump is used as the power source. The water source of the water pump comes from the liquid outlet of the re-sedimentation tank and the water discharged from the top outlet of the first hydrocyclone separator.

[0006] The above technical solution also includes a solid-liquid separator, wherein the outlet of the re-sedimentation tank and the top outlet of the first cyclone separator are both connected to the solid-liquid separator, and the inlet of the water pump is connected to the solid-liquid separator.

[0007] The beneficial effect of the above technical solution is that the water at the water pump inlet can be filtered by the solid-liquid separator, and the solid components such as sludge in the water can be removed in a timely manner.

[0008] The above technical solution also includes two first jet mixers. The slag discharge port of the pre-sedimentation tank, the water outlet of the water pump, and the feed inlet of the second cyclone separator are connected through one of the first jet mixers. The slag discharge port of the re-sedimentation tank, the water pump, and the feed inlet of the first cyclone separator are connected through the other first jet mixer.

[0009] The beneficial effect of the above technical solution is that the first jet mixer uses water jets from a water pump at the slag discharge port of the pre-sedimentation tank and the re-sedimentation tank to draw in the abrasive and spray the abrasive into the first cyclone separator and the second cyclone separator.

[0010] In the above technical solutions, the first jet mixer is a Venturi mixer jet.

[0011] The beneficial effects of the above technical solution are: it has a good jetting effect, and its bypass port can form a negative pressure after being connected to the slag discharge port of the corresponding pre-sedimentation tank or re-sedimentation tank so that the abrasive is sucked into the first jet mixer and mixed with the water flow before being ejected.

[0012] The second objective of this invention is to provide a metal strip descaling assembly that can dynamically classify and recycle abrasives according to their particle size in an online manner.

[0013] To achieve the above objectives, the technical solution of the present invention is as follows: A metal strip descaling assembly includes a hopper, a sandblasting head, an abrasive box, and a dynamic abrasive particle size classification device as described above. Slit-shaped openings are horizontally arranged on the hopper walls on both the front and rear sides. The two slit-shaped openings allow the metal strip to enter and exit the hopper in the front-rear direction. The sandblasting head is disposed inside the hopper, with its blasting nozzle facing the metal strip. The abrasive inlet of the sandblasting head is connected to the outlet of the abrasive box. The outlets of the first, second, and third material boxes are all connected to the abrasive box. The sandblasting head is used to spray abrasive onto the corresponding surface of the metal strip to polish the surface scale. A discharge port is provided at the lower end of the hopper, and the discharge port at the lower end of the hopper is connected to the pre-sedimentation tank.

[0014] The beneficial effects of the above technical solution are as follows: Three grades of abrasive materials can be fed into the abrasive tank from the first, second, and third material tanks. The three grades of abrasive materials are mixed within the abrasive tank. The mixed abrasive is then blasted out through the blasting head to impact and grind the surface of the metal sheet / strip to remove scale. The abrasive collected in the hopper is discharged into the pre-sedimentation tank and re-graded by the dynamic abrasive particle size classification device, thus achieving abrasive recycling. However, during the grinding process, the abrasive experiences wear, resulting in a decrease in large-diameter abrasive particles and an increase in small-diameter abrasive particles. Therefore, it is necessary to replenish the first material tank with new abrasive as needed. The small-diameter abrasive particles, due to their small size, are eventually discharged through the outlet of the re-sedimentation tank and mixed in the water for recycling.

[0015] The above technical solution also includes a second jet mixer. The outlet of the water pump and the discharge port at the lower end of the hopper are connected to the pre-sedimentation tank through the second jet mixer. The second jet mixer is used to carry the abrasive discharged from the hopper into the pre-sedimentation tank in the form of a jet under the action of the water flow pumped out by the water pump.

[0016] The beneficial effect of the above technical solution is that the mixture of abrasive and water discharged from the discharge port at the lower end of the hopper can be drawn into the second jet mixer and sprayed into the pre-sedimentation tank for pre-sedimentation.

[0017] In the above technical solutions, the second jet mixer is a Venturi mixer jet.

[0018] The advantages of the above technical solution are that it has a simple structure and a good abrasive suction effect.

[0019] The abrasive box described in the above technical solution is also provided with a vent at its lower end, and the vent is connected to the inside of the trough. A valve is provided at the vent.

[0020] The beneficial effect of the above technical solution is that when it is necessary to change the abrasive particle size ratio, the valve can be opened to discharge all the abrasive in the abrasive box into the trough, so as to empty the abrasive box. The abrasive in the trough will eventually enter the abrasive particle size dynamic classification device for reclassification.

[0021] The above technical solution describes a plurality of sandblasting heads, with the sandblasting heads located both above and below the metal strip.

[0022] The beneficial effect of the above technical solution is that multiple sandblasting heads can be used to descale both the upper and lower surfaces of the metal strip. Attached Figure Description

[0023] Figure 1 This is a simplified structural diagram of the dynamic abrasive particle size classification device described in Embodiment 1 of the present invention;

[0024] Figure 2 This is a simplified structural diagram of the metal strip descaling assembly described in Embodiment 2 of the present invention;

[0025] Figure 3 This is a schematic diagram of the assembly of the trough, metal strip, and sandblasting head described in Embodiment 2 of the present invention;

[0026] Figure 4 This is another simplified structural diagram of the metal strip descaling assembly described in Embodiment 2 of the present invention.

[0027] In the figure: 1. Dynamic abrasive particle size classification device, 11a. Pre-sedimentation tank, 11b. Re-sedimentation tank, 12. First cyclone separator, 13. Second cyclone separator, 14. Water pump, 15. First material box, 16. Second material box, 17. Third material box, 18. Solid-liquid separator, 19. First jet mixer, 2. Tank, 21. Slit opening, 3. Sandblasting head, 4. Abrasive box, 41. Valve, 5. Metal plate and strip, 6. Second jet mixer. Detailed Implementation

[0028] The principles and features of the present invention are described below. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0029] Example 1

[0030] like Figure 1 As shown, this embodiment provides a dynamic abrasive particle size classification device, including a pre-sedimentation tank 11a, a re-sedimentation tank 11b, a first hydrocyclone separator 12, a second hydrocyclone separator 13, a water pump 14, a first feed tank 15, a second feed tank 16, and a third feed tank 17. The pre-sedimentation tank 11a is used to hold a mixture of abrasive and water. The outlet of the pre-sedimentation tank 11a is connected to the interior of the re-sedimentation tank 11b. The outlet of the re-sedimentation tank 11b and the top outlet of the first hydrocyclone separator 12 are both connected to the water pump 14. The inlet of the pre-sedimentation tank 11a and the outlet of the re-sedimentation tank 11b are connected to the outlet of the water pump 14. The outlet of the pre-sedimentation tank 11a is also connected to the inlet of the second hydrocyclone 13, and the outlet of the re-sedimentation tank 11b is also connected to the inlet of the first hydrocyclone 12. The bottom outlet of the first hydrocyclone 12 is connected to the inside of the third material box 17, and the top outlet of the second hydrocyclone 13 is connected to the inside of the second material box 16. The bottom outlet of the hydrocyclone separator 13 is connected to the inside of the first material tank 15, allowing the abrasive discharged from the pre-sedimentation tank outlet to be classified by the second hydrocyclone separator. The abrasive discharged from the bottom outlet of the second hydrocyclone separator is the largest particle size abrasive, which is collected in the first material tank. The abrasive discharged from the top outlet of the second hydrocyclone separator is the medium particle size abrasive, which is collected in the second material tank. The re-sedimentation tank then settles the abrasive in the water discharged from the pre-sedimentation tank outlet, and the sediment is then separated by the first hydrocyclone separator. The separation process involves the following: the abrasive discharged from the bottom outlet of the first hydrocyclone separator is the smallest type of abrasive, which is collected in the third material box; while the abrasive discharged from the top outlet of the first hydrocyclone separator is water. The classification is simple, and the classified abrasive can be stored separately. When the abrasive is transported from the slag discharge outlet of the pre-sedimentation tank and the re-sedimentation tank to the corresponding first hydrocyclone separator and second hydrocyclone separator, the water is pumped out by a water pump. The water source for the water pump comes from the liquid outlet of the re-sedimentation tank and the water discharged from the top outlet of the first hydrocyclone separator.

[0031] The above technical solution also includes a solid-liquid separator 18. The outlet of the re-sedimentation tank 11b and the top outlet of the first cyclone separator 12 are both connected to the solid-liquid separator 18. The inlet of the water pump 14 is connected to the solid-liquid separator 18. In this way, the solid-liquid separator can filter the water at the inlet of the water pump and remove solid components such as sludge from the water in a timely manner. The solid-liquid separator also has a sludge discharge port, which is used to discharge the sludge intercepted by the solid-liquid separator (a collection tank can be set up, and the sludge discharge port of the solid-liquid separator is connected to the collection tank, which is used to collect the sludge discharged by the solid-liquid separator). The solid-liquid separator 18 can be a magnetic filter or an inclined plate sedimentation tank.

[0032] The above technical solution also includes two first jet mixers 19. The slag discharge port of the pre-sedimentation tank 11a, the water outlet of the water pump 14, and the feed inlet of the second cyclone separator 13 are connected through one of the first jet mixers 19. The slag discharge port of the re-sedimentation tank 11b, the water pump 14, and the feed inlet of the first cyclone separator 12 are connected through the other first jet mixer 19. In this way, the first jet mixer uses the water flow ejected by the water pump at the slag discharge port of the pre-sedimentation tank and the re-sedimentation tank to jet the abrasive and spray the abrasive towards the first cyclone separator and the second cyclone separator.

[0033] In the above technical solution, the first jet mixer 19 is a Venturi mixer jetter, which has a good jetting effect. After its bypass port is connected to the slag discharge port of the corresponding pre-sedimentation tank or re-sedimentation tank, a negative pressure can be formed to draw the abrasive into the first jet mixer, and then mix it with the water flow before jetting it out.

[0034] Taking the pre-sedimentation tank as an example, the inlet of its corresponding first jet mixer is connected to the outlet of the water pump, its side suction port is connected to the slag discharge port of the pre-sedimentation tank, and its outlet is connected to the feed port of the second cyclone separator. The connection method between the re-sedimentation tank and its corresponding first jet mixer is similar to that between the pre-sedimentation tank and its corresponding first jet mixer, and will not be described in detail here.

[0035] The bottom outlet of the first cyclone separator, the top outlet and the bottom outlet of the second cyclone separator discharge water while discharging abrasive (at this time, what is discharged is a mixture of water and abrasive, so the first, second and third material boxes store a mixture of abrasive and water).

[0036] Example 2

[0037] like Figure 2 and Figure 3As shown, this embodiment provides a metal strip descaling assembly, including a hopper 2, a blasting head 3, an abrasive box 4, and an abrasive particle size dynamic grading device 1 as described in Embodiment 1. Slit-shaped openings 21 are horizontally arranged on the front and rear walls of the hopper 2. The two slit-shaped openings 21 allow the metal strip 5 to enter and exit the hopper 2 in the front-rear direction. The blasting head 3 is located inside the hopper 2, with its blasting nozzle facing the metal strip 5. The abrasive inlet of the blasting head 3 is connected to the outlet of the abrasive box 4. The outlets of the first material box 15, the second material box 16, and the third material box 17 are all connected to the abrasive box 4. The blasting head 3 is used to spray abrasive onto the corresponding surface of the metal strip 5 to polish the surface scale. A discharge port is provided at the lower end of the hopper 2, and the discharge port at the lower end of the hopper 2 is connected to the pre-sedimentation tank 11a. The first, second, and third feed hoppers can feed three grades of abrasive into the abrasive tank, where the three grades of abrasive are mixed. The mixed abrasive is then blasted through the blasting head to impact and grind the surface of the metal strip to remove scale. The abrasive collected in the hopper is discharged into the pre-sedimentation tank and re-graded by the dynamic abrasive particle size classification device, thus realizing the recycling of abrasive. During the grinding process, the abrasive wears down, so the large-diameter abrasive will become less and less, while the small-diameter abrasive will become more and more. Therefore, it is necessary to add new abrasive to the first feed hopper or directly to the hopper as needed. The small-diameter abrasive will eventually be discharged through the outlet of the re-sedimentation tank and mixed with water for circulation (when it circulates to the solid-liquid separator 18, the solid-liquid separator intercepts the slag and fine abrasive in the water and discharges it as waste).

[0038] The two slit openings are at the same horizontal level and their ends are flush. The length of the slit opening is slightly greater than the width of the metal strip, so that the metal strip can pass smoothly through the two slit openings and be conveyed.

[0039] like Figure 4 As shown, the above technical solution also includes a second jet mixer 6. The outlet of the water pump 14 and the discharge port at the lower end of the hopper 2 are connected to the pre-sedimentation tank 11a through the second jet mixer 6. The second jet mixer 6 is used to carry the abrasive discharged from the hopper 2 into the pre-sedimentation tank 11a in the form of a jet under the action of the water flow pumped out by the water pump 14. In this way, the mixture of abrasive and water discharged from the discharge port at the lower end of the hopper can be sucked into the second jet mixer and sprayed into the pre-sedimentation tank for pre-sedimentation.

[0040] In the above technical solution, the second jet mixer 6 is a Venturi mixing jet, which has a simple structure (the side suction port of the second jet mixer is connected to the discharge port at the lower end of the trough, the liquid inlet of the second jet mixer is connected to the water outlet of the water pump, and the liquid outlet of the second jet mixer is connected to the pre-sedimentation tank), and has a good suction effect on abrasive.

[0041] The abrasive box 4 described in the above technical solution is also provided with an exhaust port at its lower end, and the exhaust port is connected to the trough 2. A valve 41 is provided at the exhaust port. When it is necessary to change the abrasive particle size ratio, the valve 41 can be opened to discharge all the abrasive in the abrasive box into the trough, thereby emptying the abrasive box. The abrasive in the trough will eventually enter the abrasive particle size dynamic classification device for reclassification.

[0042] The above technical solution describes a plurality of sandblasting heads 3, with sandblasting heads 3 located both above and below the metal strip 5, so that multiple sandblasting heads can work together to descale both the upper and lower surfaces of the metal strip.

[0043] Preferably, the abrasive box may also be equipped with a stirring paddle, and the shaft of the stirring paddle may extend outside the abrasive box and be connected to a drive motor. The arrangement of the stirring paddle and the drive motor is prior art in this field, so it will not be described in detail here. The stirring paddle can mix abrasives of different specifications added to the abrasive box. When the first, second, and third material boxes add abrasives to the abrasive box, the mass ratio between the abrasives of different specifications fed into the abrasive box by the three material boxes can be set as needed.

[0044] In this embodiment, the abrasive can be steel shot. For users of conventional truck beams, wheels, etc., that are coated after stamping, the conventional hot-rolled specification is 6mm × Qste650 hot-rolled steel coil. The surface quality indicators before entering the stamping and coating process mainly include:

[0045] Cleanliness index Sa≥2.5;

[0046] The roughness index Ra≈4.0±1um.

[0047] Therefore, when using mixed jet descaling, the abrasive particle size must be proportioned according to the following key parameters:

[0048] The percentage of abrasive particles with a diameter of 600±100um (the particle size specification of the abrasive in the first feed box): Q600=0;

[0049] The percentage of abrasive particles with a diameter of 400±100um (the particle size specification of the abrasive in the second feed box) is: 70% < Q400 < 80%;

[0050] The percentage of abrasive particles with a diameter of 200±100um (the particle size specification of the abrasive in the third feed box) is 20% < Q200 < 30%.

[0051] Thus, the first feed box remains closed before the metal strip enters the hopper; the second and third feed boxes continuously inject abrasive particles with a particle size of 400um±100um and 200um±100um into the abrasive box, respectively, with a mass ratio of 3:1. The two types of abrasive particles are continuously mixed in the abrasive box and continuously output to the blasting head. (When the abrasive particles are discharged into the first, second, and third feed boxes, they will flow in with the water. Therefore, seepage holes communicating with the pre-sedimentation tank can be set at the lower end of the first, second, and third feed boxes. At this time, the water accumulated in the first, second, and third feed boxes can be discharged into the pre-sedimentation tank through the seepage holes. A filter screen can be set at the seepage holes to intercept the abrasive particles.)

[0052] The blasting head described in this embodiment can be similar to the blasting device disclosed in document CN113997204A, "A Spraying Device for Jetting Mixed Abrasives" (in this case, the blasting head needs to be supplied with high-pressure water to drive the abrasive out, and the high-pressure water can be obtained by adding a high-pressure water pump to draw water from the outlet of the solid-liquid separator, thus enabling dual circulation of abrasive and water). This is prior art and will not be described in detail here. The blasting head spraying the abrasive in the abrasive box onto the surface of the metal strip plate is also prior art and will not be described in detail here.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. An apparatus for dynamic classification of abrasive particles, characterized by, The device comprises a pre-deposition tank (11a), a re-deposition tank (11b), a first cyclone separator (12), a second cyclone separator (13), a water pump (14), a first material box (15), a second material box (16) and a third material box (17), the pre-deposition tank (11a) is used to contain the mixture of abrasive and water, the outlet of the pre-deposition tank (11a) is communicated with the re-deposition tank (11b), the outlet of the re-deposition tank (11b) and the top outlet of the first cyclone separator (12) are communicated with the water inlet of the water pump (14), the slag discharge outlets of the pre-deposition tank (11a) and the re-deposition tank (11b) are communicated with the water outlet of the water pump (14), the slag discharge outlet of the pre-deposition tank (11a) is also communicated with the feed inlet of the second cyclone separator (13), the slag discharge outlet of the re-deposition tank (11b) is also communicated with the feed inlet of the first cyclone separator (12), the bottom outlet of the first cyclone separator (12) is communicated with the third material box (17), the top outlet of the second cyclone separator (13) is communicated with the second material box (16), and the bottom outlet of the second cyclone separator (13) is communicated with the first material box (15).

2. The abrasive particle dynamic sizing apparatus of claim 1, wherein, The device further comprises a solid-liquid separator (18), the outlet of the re-deposition tank (11b) and the top outlet of the first cyclone separator (12) are communicated with the solid-liquid separator (18), and the water inlet of the water pump (14) is communicated with the solid-liquid separator (18).

3. The apparatus of claim 1, wherein, The device further comprises two first jet mixers (19), the slag discharge outlet of the pre-deposition tank (11a), the water outlet of the water pump (14) and the feed inlet of the second cyclone separator (13) are communicated through one of the first jet mixers (19), and the slag discharge outlet of the re-deposition tank (11b), the water pump (14) and the feed inlet of the first cyclone separator (12) are communicated through the other first jet mixer (19).

4. The abrasive particle dynamic sizing apparatus of claim 3, wherein, The first jet mixers (19) are Venturi mixers.

5. A metal strip descaling assembly characterized by, The device comprises a trough (2), a sand blasting head (3), an abrasive box (4) and the abrasive particle size dynamic grading device (1) according to any one of claims 1-4, the trough (2) is provided with slit-shaped openings (21) on the trough walls of the front and back sides, the two slit-shaped openings (21) are used for the metal plate belt (5) to enter and exit the trough (2) in the front and back directions, the sand blasting head (3) is arranged in the trough (2) and the sand blasting port of the sand blasting head (3) faces the metal plate belt (5), the abrasive inlet of the sand blasting head (3) is communicated with the discharge outlet of the abrasive box (4), the discharge outlets of the first material box (15), the second material box (16) and the third material box (17) are communicated with the abrasive box (4), and the sand blasting head (3) is used to spray abrasive on the surface of the corresponding side of the metal plate belt (5) to polish the surface scale of the metal plate belt (5), and the lower end of the trough (2) is provided with a discharge outlet, and the discharge outlet of the lower end of the trough (2) is communicated with the pre-deposition tank (11a).

6. The metal strip descaling assembly of claim 5, wherein, The second jet mixer (6) is arranged between the water outlet of the water pump (14) and the discharge port of the lower end of the chute (2) and is in communication with the pre-sedimentation tank (11a), and the second jet mixer (6) is used to bring the abrasive discharged from the chute (2) into the pre-sedimentation tank (11a) in the form of a jet under the action of the water flow pumped by the water pump (14).

7. The metal strip descaling assembly of claim 6, wherein, The second jet mixer (6) is a Venturi mixing injector.

8. The metal strip descaling assembly of claim 5, wherein, The lower end of the abrasive tank (4) is further provided with a discharge port, and the discharge port is in communication with the chute (2), and a valve (41) is arranged at the discharge port.

9. The metal strip descaling assembly of claim 5, wherein, The sand blasting head (3) has a plurality of sand blasting heads (3), and the upper and lower sides of the metal plate belt (5) are provided with the sand blasting heads (3).

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