Steel coil end face spraying equipment and magnesium oxide solution spraying method

Abstract

The invention discloses steel coil end face spraying equipment and a magnesium oxide solution spraying method, and belongs to the technical field of steel coil end face spraying. The steel coil end face spraying equipment comprises a working platform, a spraying assembly, an axial movement control assembly, a lifting control assembly and a rotation control assembly; the axial movement control assembly is installed on the upper surface of the working platform, the lifting control assembly is installed at the output end of the axial movement control assembly, the rotation control assembly is installed at the output end of the lifting control assembly, and the spraying assembly is fixedly installed at the output end of the rotation control assembly. The spraying assembly comprises a spraying head used for spraying the end face of the steel coil. The automatic spraying device has the beneficial effects that the axial movement control assembly, the lifting control assembly and the rotation control assembly are used for controlling the spraying head to ascend and descend, get close to or get away from the end face of the steel coil and rotate in the circumferential direction of the end face of the steel coil, automatic spraying operation on the end face of the steel coil is achieved, and the problems that manual brushing labor intensity is large, and brushing quality is inconsistent are solved.

Description

Technical Field

[0001] The invention relates to the technical field of steel coil end surface spraying, and in particular to a steel coil end surface spraying equipment and a magnesium oxide solution spraying method. Background Art

[0002] During the annealing process of silicon steel coils in a ring furnace, in order to suppress the risk of edge cracking caused by coarsening of the edge grains during the annealing process, a layer of magnesium oxide is generally applied before the end surface of the steel coil is annealed. However, magnesium oxide mixed with water is a non-Newtonian fluid, which is easy to solidify quickly, and the viscosity parameters are not controlled, which is easy to clog pipes and nozzles. At present, there is no relevant stable and reliable automatic spraying device. The silicon steel production line mainly relies on manual painting, which is labor-intensive and inconsistent in painting quality, affecting the effect of preventing edge cracking.

[0003] In view of this, the inventor conducted in-depth research on this demand, and thus the present case was produced. Summary of the invention

[0004] Aiming at the problems in the prior art that the end surface spraying of silicon steel coils mainly relies on manual labor, which is labor-intensive, inconsistent in brushing quality, and affects the effect of preventing edge cracking, the present invention provides a steel coil end surface spraying equipment and a magnesium oxide solution spraying method. Through automatic control of spraying, the conveying material is stable and controllable, and it can adapt to different coil diameters for spraying. The coating is uniformly controlled, which solves the problems of labor intensity and inconsistent brushing quality of manual brushing. The specific technical scheme is as follows:

[0005] A steel coil end surface spraying equipment, comprising a working platform, a spraying assembly, an axial movement control assembly for controlling the spraying assembly to move axially along the steel coil, a lifting control assembly for controlling the lifting of the spraying assembly, and a rotation control assembly for controlling the spraying assembly to rotate along the central axis of the steel coil, wherein the steel coil and the spraying assembly are located below the working platform, and the axial movement control assembly is installed on the upper surface of the working platform, the lifting control assembly is installed at the output end of the axial movement control assembly, the rotation control assembly is installed at the output end of the lifting control assembly, and the spraying assembly is fixedly installed at the output end of the rotation control assembly;

[0006] The spraying assembly comprises a spray head for spraying the end surface of the steel coil.

[0007] The axial movement control component, the lifting control component and the rotation control component are used to control the lifting and lowering of the nozzle, the approach to or distance from the end face of the steel coil, and the rotation of the nozzle along the circumference of the end face of the steel coil, thereby realizing automatic spraying operation on the end face of the steel coil, solving the problems of high labor intensity and inconsistent painting quality caused by manual painting.

[0008] In a preferred embodiment, the spray assembly includes a spray frame, a telescopic arm, a telescopic motor, an inner spray arm and an outer spray arm, the spray frame is installed at the output end of the rotation control assembly, the telescopic motor and the telescopic arm are fixedly installed on the spray frame, the inner spray arm and the outer spray arm are installed on the telescopic arm and can perform telescopic movement along the radial direction of the end face of the steel coil under the drive of the telescopic motor; the inner spray arm is equipped with an inner nozzle for spraying the inner radius of the end face of the steel coil, and the outer spray arm is equipped with an outer nozzle for spraying the outer radius of the end face of the steel coil. Here, it is preferred that the caliber of the inner nozzle is smaller than the caliber of the outer nozzle, and the caliber ratio is preferably 2:3.

[0009] By adopting the above technical scheme, the inner and outer nozzles are used to spray the inner and outer radii of the end face of the steel coil respectively, and the inner and outer spray arms are extended and retracted radially along the end face of the steel coil to achieve the purpose of spraying the entire end face of the steel coil.

[0010] Preferably, a camera is installed on the telescopic arm, and the number of reciprocating extension and retraction times and the extension and retraction amount of the telescopic arm are set according to the spraying quality detected by the camera, so as to improve the spraying uniformity.

[0011] Preferably, the lifting control assembly comprises a supporting truss, a lifting truss, a protective cover and a lifting drive mechanism for driving the lifting truss to lift and lower; the supporting truss is installed at the output end of the axial movement control assembly; the lifting truss is suspended in the supporting truss and can perform lifting and lowering movements relative to the supporting truss; the protective cover is suspended at the end of the steel coil on the lower side of the lifting truss; the rotation control assembly is installed on the lifting truss, and the spraying assembly is located in the protective cover.

[0012] By adopting the above technical solution, the lifting control component is used to control the rotation center of the spraying component to coincide with the central axis of the end surface of the steel coil, so that the spraying effect of the nozzle is more uniform during rotary spraying.

[0013] Preferably, a hot air blower for blowing a hot air flow toward the nozzle is installed above the protective cover. When the end surface temperature of the steel coil is above 65°C, the hot air blower is not turned on during the spraying process. When the temperature is lower than 65°C, the heating blower is turned on during the spraying process to prevent the spray liquid from solidifying rapidly during the spraying process and affecting the spraying effect.

[0014] Preferably, the lifting drive mechanism comprises a lifting motor, a first transmission sprocket, a second transmission sprocket, a third transmission sprocket, a fourth transmission sprocket, a transmission shaft and a lifting block, the lifting motor is fixedly mounted on the upper surface of the supporting truss, the first transmission sprocket is fixedly mounted on the rotating shaft of the lifting motor, the transmission shaft is rotatably mounted on the upper surface of the supporting truss and the second transmission sprocket is fixedly mounted in the middle thereof, and the first transmission sprocket and the second transmission sprocket are driven by a first chain;

[0015] The transmission shaft is provided with a third transmission sprocket at both ends, and a fourth transmission sprocket is provided at the bottom of both sides of the support truss and directly below the third transmission sprocket, and the third transmission sprocket and the fourth transmission sprocket are driven by a second chain;

[0016] The lifting block is slidably mounted on the supporting truss, the lifting block is fixedly mounted on the second chain and can be lifted relative to the supporting truss driven by the second chain, and the lifting truss is fixedly mounted on the lifting block. The lifting motor is engaged with the sprocket through the chain to output power to the transmission shaft. The sprocket drives the sprocket through the chain, and according to the coil diameter of the steel coil, the lifting truss can be driven to lift along the lifting guide rail to ensure that the protective cover suspended on the lifting truss and the center position of the rotating sprocket match the coil diameter center of the steel coil.

[0017] By adopting the above technical solution, the lifting motor can more stably control the lifting of the spraying component, and the stability is better during the rotation of the spraying component without shaking.

[0018] Preferably, the axial movement control assembly includes a travel guide rail, a travel rack and a travel motor, the travel guide rail and the travel rack are fixedly mounted on the upper surface of the working platform and are parallel to the axis of the steel coil, and the support truss is slidably mounted on the travel guide rail, a travel motor is mounted on the support truss near the travel rack, a travel gear is fixedly mounted on the output end of the travel motor, and the travel gear is meshed with the travel rack. The support truss is placed on the travel rail, and under the interaction of the travel motors and the travel racks on both sides, the support truss can be driven to move along the travel guide rail according to the width of the steel coil, and the spraying system can be driven to move along the axial direction of the steel coil synchronously, ensuring that the spraying system maintains a suitable distance from the end face of the steel coil in the axial direction. Generally, a protective cover that can fully enclose the end of the steel coil is considered a suitable position.

[0019] Preferably, the rotation control assembly includes a rotating motor, a first rotating sprocket and a second rotating sprocket, the rotating motor is fixedly mounted on the lifting truss, the first rotating sprocket is mounted on the rotating shaft of the rotating motor, the second rotating sprocket is rotatably mounted at the center of the protective cover through the spray rotating shaft, the first rotating sprocket and the second rotating sprocket are driven by a rotating chain, and the spray assembly is fixedly mounted on the spray rotating shaft through a spray mounting seat. The rotating sprocket and the rotating chain adopt a double-row sprocket structure, and the two side-by-side sprockets adopt a staggered tooth arrangement to improve the transmission control accuracy.

[0020] In one embodiment, the present invention further provides a method for spraying magnesium oxide solution on the end surface of a steel coil, using the above-mentioned spraying device, comprising the following steps:

[0021] Step S1, placing the steel coil on the saddle, adjusting the position of the supporting truss by using the axial movement control component according to the width of the steel coil, so that the distance between the spraying component and the end surface of the steel coil is maintained within a suitable range; adjusting the height of the spraying component by using the lifting control component, so that the rotation center of the spraying component is located on the central axis of the steel coil;

[0022] Step S2, preparing a magnesium oxide solution, and pressurizing and spraying the magnesium oxide solution through a pump, the working pressure is set to 6.0-8.0 bar, the rotation control component controls the spray component to rotate at 0.5-1.0 r / min, and at the same time, the telescopic motor drives the telescopic arm to first telescope from the outer radius of the steel coil to the inner radius, and then telescope from the inner radius of the steel coil to the outer radius, and reciprocates 2-4 times to ensure that the end surface of the steel coil is evenly sprayed from the outside to the inside;

[0023] Step S3, the telescopic motor drives the telescopic arm to extend and retract from the inner radius of the steel coil to the outer radius, and rotate to the position of the solution recovery pipeline, and send the externally supplied flushing water to the outer nozzle and the inner nozzle, and backwash the outer nozzle and the inner nozzle until there is no residue in the pipeline, and the flushing waste liquid enters the sewage system through the recovery pipeline.

[0024] Preferably, in step S2, the magnesium oxide solution is prepared, including:

[0025] The configuration weight y of magnesium oxide powder is calculated according to the outer diameter x of the steel coil, where the weight y satisfies: y=6+2*(x-1400), where the unit of x is mm and the unit of y is kg;

[0026] Mix and dissolve magnesium oxide powder and dissolving water in a mass ratio of (2 / 3-4 / 5):1, and control the dissolving water temperature within the range of 3-8°C;

[0027] Put magnesium oxide powder into the mixing barrel, quickly add dissolved water and stir quickly. The stirring speed is controlled at 400-600r / min. After the rotation and stirring are completed within 3-5 minutes, the magnesium oxide solution is sent to the spraying system.

[0028] The beneficial effects produced by the technical solution of the present invention are as follows:

[0029] (1) The axial movement control component, the lifting control component and the rotation control component are used to control the lifting and lowering of the nozzle, the approach to or distance from the end surface of the steel coil, and the rotation of the nozzle along the circumference of the end surface of the steel coil, thereby realizing the automatic spraying operation on the end surface of the steel coil, solving the problems of high labor intensity and inconsistent painting quality of manual painting.

[0030] (2) The inner and outer nozzles are used to spray the inner and outer radii of the end face of the steel coil respectively, and the lead screw structure is used to control the telescopic arm to extend and retract radially along the end face of the steel coil, thereby achieving the purpose of spraying the entire end face of the steel coil.

[0031] (3) The support truss is placed on the travel track. Under the interaction of the travel motors and the travel racks on both sides, the support truss can be driven to move along the travel track according to the width of the steel coil, and the spraying system can be driven to move along the axial direction of the steel coil simultaneously to ensure that the spraying system maintains an appropriate distance from the end face of the steel coil in the axial direction. Generally, the protective cover can fully enclose the end of the steel coil for protection.

[0032] (4) The relevant process parameters of the spraying process are controlled by combining the hydration characteristics of magnesium oxide, and the amount of ingredients can be accurately measured. It has the characteristics of high degree of automation, stable and controllable material transportation, the ability to adapt to different roll diameters for spraying, and uniform and controlled coating. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 This is a schematic diagram of the three-dimensional structure of a preferred steel coil end surface spraying equipment of the present invention;

[0035] Figure 2 This is a schematic diagram of the main structure of a preferred steel coil end surface spraying equipment of the present invention;

[0036] Figure 3 It is a schematic diagram of the side view structure of a preferred steel coil end surface spraying equipment of the present invention;

[0037] Figure 4This is a partial three-dimensional structure diagram of a preferred steel coil end surface spraying equipment of the present invention Figure 1 ;

[0038] Figure 5 This is a partial three-dimensional structure diagram of a preferred steel coil end surface spraying equipment of the present invention Figure 2 ;

[0039] Figure 6 This is a schematic diagram of the preferred three-dimensional structure of the spray assembly of the present invention Figure 1 ;

[0040] Figure 7 This is a schematic diagram of the preferred three-dimensional structure of the spray assembly of the present invention Figure 2 ;

[0041] Figure 8 It is a schematic diagram of the telescopic transmission structure of a preferred spray assembly of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] like Figure 1-8 As shown, the steel coil end surface spraying equipment includes a working platform 1, a spraying component 2, an axial movement control component 3 for controlling the axial movement of the spraying component 2 along the steel coil 100, a lifting control component 4 for controlling the lifting of the spraying component 2, and a rotation control component 5 for controlling the rotation of the spraying component 2 along the central axis of the steel coil 100. The steel coil 100 and the spraying component 2 are located below the working platform 1, and the axial movement control component 3 is installed on the upper surface of the working platform 1, the lifting control component 4 is installed at the output end of the axial movement control component 3, the rotation control component 5 is installed at the output end of the lifting control component 4, and the spraying component 2 is fixedly installed at the output end of the rotation control component 5; the steel coil 100 is placed on the saddle 200.

[0044] The spraying assembly 2 includes a spray head for spraying the end surface of the steel coil 100 .

[0045] It is easy to understand that the spraying assembly is a structure in the spraying device used to perform the spraying operation. In order to achieve a good spraying effect, see Figure 6 and 7 Here, the spray assembly 2 may include a spray frame 21, a telescopic arm 22, a telescopic motor 23, an inner spray arm 24 and an outer spray arm 25, wherein the spray frame 21 is mounted at the output end of the rotation control assembly 5, the telescopic motor 23 and the telescopic arm 22 are fixedly mounted on the spray frame 21, the inner spray arm 24 and the outer spray arm 25 are mounted on the telescopic arm 22 and can perform telescopic movement along the radial direction of the end face of the steel coil 100 under the drive of the telescopic motor 23; the inner spray arm 24 is mounted with an inner nozzle 27 for spraying the inner radius of the end face of the steel coil 100, and the outer spray arm 25 is mounted with an outer nozzle 28 for spraying the outer radius of the end face of the steel coil 100, wherein the caliber of the inner nozzle is preferably smaller than that of the outer nozzle, and the caliber ratio is preferably 2:3.

[0046] As a preferred embodiment, Figure 8 As shown, the telescopic arm 22 is a hollow structure and a screw rod 26 is rotatably installed inside it. One end of the screw rod 26 is installed on the output end of the telescopic motor 23 through a gear transmission structure 260. The two screw rod mounting seats 261 are threadedly connected to the screw rod along the length direction of the screw rod and can slide back and forth along the length direction as the screw rod 26 rotates. One end of the inner spray arm 24 and the outer spray arm 25 are respectively installed on the two screw rod mounting seats 261, and the other end is installed with the inner nozzle 27 or the outer nozzle 28.

[0047] As a preferred embodiment, a camera (not shown in the figure) is installed on the telescopic arm 22. According to the spraying quality detected by the camera, the number of reciprocating extension and retraction times and the extension and retraction amount of the telescopic arm are set to improve the spraying uniformity.

[0048] As a preferred embodiment, see Figure 2-5 The lifting control assembly 4 includes a supporting truss 41, a lifting truss 42, a protective cover 43 and a lifting drive mechanism 44 for driving the lifting truss 42 to lift and lower. The supporting truss 41 is installed at the output end of the axial movement control assembly 3. The lifting truss 42 is suspended in the supporting truss 41 and can be lifted and lowered relative to the supporting truss 41. The protective cover 43 is suspended at the end position of the steel coil 100 on the lower side of the lifting truss 42. The rotation control assembly 5 is installed on the lifting truss 42, and the spraying assembly 2 is located in the protective cover 43.

[0049] As a preferred embodiment, a hot air blower 431 for blowing a hot air flow toward the nozzle is installed above the protective cover 43. When the end surface temperature of the steel coil is above 65°C, the hot air blower is not turned on during the spraying process. When the temperature is lower than 65°C, the heating blower is turned on during the spraying process to prevent the spray liquid from solidifying rapidly during the spraying process and affecting the spraying effect.

[0050] As a preferred embodiment, see Figure 5 The lifting drive mechanism 44 includes a lifting motor 441, a first transmission sprocket 442, a second transmission sprocket 443, a third transmission sprocket 444, a fourth transmission sprocket 445, a transmission shaft 446 and a lifting block 447. The lifting motor 441 is fixedly mounted on the upper surface of the support truss 41. The first transmission sprocket 442 is fixedly mounted on the rotating shaft of the lifting motor 441. The transmission shaft 446 is rotatably mounted on the upper surface of the support truss 41 and the second transmission sprocket 443 is fixedly mounted in the middle thereof. The first transmission sprocket 442 and the second transmission sprocket 443 are driven by a first chain 448.

[0051] A third transmission sprocket 444 is installed at both ends of the transmission shaft 446, and a fourth transmission sprocket 445 is installed at the bottom of both sides of the support truss 41 and directly below the third transmission sprocket 444. The third transmission sprocket 444 and the fourth transmission sprocket 445 are driven by a second chain 449;

[0052] The lifting block 447 is slidably mounted on the support truss 41, and the lifting block 447 is fixedly mounted on the second chain 449 and can be lifted relative to the support truss 41 driven by the second chain 449, and the lifting truss 42 is fixedly mounted on the lifting block 447. The lifting motor 441 is engaged with the sprocket through the chain to output power to the transmission shaft. The sprocket drives the sprocket through the chain, and according to the coil diameter of the steel coil, the lifting truss can be driven to lift along the lifting guide rail to ensure that the protective cover suspended on the lifting truss and the center position of the rotating sprocket match the coil diameter center of the steel coil.

[0053] As a preferred embodiment, see Figure 1 , 4and 5, the axial movement control assembly 3 includes a walking rail 31, a walking rack 32 and a walking motor 33, the walking rail 31 and the walking rack 32 are fixedly mounted on the upper surface of the working platform 1 and are both axially parallel to the steel coil 100, and the supporting truss 41 is slidably mounted on the walking rail 31, a walking motor 33 is mounted on the supporting truss 41 near the walking rack 32, a walking gear 34 is fixedly mounted on the output end of the walking motor 33, and the walking gear 34 is meshed with the walking rack 32. The supporting truss is placed on the walking rail, and under the interaction of the walking motors and the walking racks on both sides, the supporting truss can be driven to move along the walking rail according to the width of the steel coil, and the spraying system can be driven to move along the axial direction of the steel coil synchronously, ensuring that the spraying system maintains a suitable distance from the end face of the steel coil in the axial direction, and generally, the protective cover can fully enclose the end of the steel coil as a suitable position.

[0054] As a preferred embodiment, see Figure 2 , 4 6, the rotation control assembly 5 includes a rotating motor 51, a first rotating sprocket 52 and a second rotating sprocket 53, the rotating motor 51 is fixedly mounted on the lifting truss 42, the first rotating sprocket 52 is mounted on the rotating shaft of the rotating motor 51, the second rotating sprocket 53 is rotatably mounted at the center of the protective cover 43 through the spraying rotating shaft 54, the first rotating sprocket 52 and the second rotating sprocket 53 are driven by a rotating chain 55, and the spraying assembly 2 is fixedly mounted on the spraying rotating shaft 54 ​​through the spraying mounting seat 29. The rotating sprocket and the rotating chain adopt a double-row sprocket structure, and the two side-by-side sprockets adopt a staggered tooth arrangement to improve the transmission control accuracy.

[0055] In one embodiment, the present invention further provides a method for spraying magnesium oxide solution on the end surface of a steel coil, using the above-mentioned spraying device, comprising the following steps:

[0056] Step S1, placing the steel coil on the saddle, adjusting the position of the supporting truss by using the axial movement control component according to the width of the steel coil, so that the distance between the spraying component and the end surface of the steel coil is maintained within a suitable range; adjusting the height of the spraying component by using the lifting control component, so that the rotation center of the spraying component is located on the central axis of the steel coil;

[0057] Step S2, preparing a magnesium oxide solution, and pressurizing and spraying the magnesium oxide solution through a pump, the working pressure is set to 6.0-8.0 bar, the rotation control component controls the spray component to rotate at 0.5-1.0 r / min, and at the same time, the telescopic motor drives the telescopic arm to first telescope from the outer radius of the steel coil to the inner radius, and then telescope from the inner radius of the steel coil to the outer radius, and reciprocates 2-4 times to ensure that the end surface of the steel coil is evenly sprayed from the outside to the inside;

[0058] Step S3, the telescopic motor drives the telescopic arm to extend and retract from the inner radius of the steel coil to the outer radius, and rotate to the position of the solution recovery pipeline, and send the externally supplied flushing water to the outer nozzle and the inner nozzle, and backwash the outer nozzle and the inner nozzle until there is no residue in the pipeline, and the flushing waste liquid enters the sewage system through the recovery pipeline.

[0059] Preferably, in step S2, the magnesium oxide solution is prepared, including:

[0060] The configuration weight y of magnesium oxide powder is calculated according to the outer diameter x of the steel coil, where the weight y satisfies: y=6+2*(x-1400), where the unit of x is mm and the unit of y is kg;

[0061] Mix and dissolve magnesium oxide powder and dissolving water in a mass ratio of (2 / 3-4 / 5):1, and control the dissolving water temperature within the range of 3-8°C;

[0062] Put magnesium oxide powder into the mixing barrel, quickly add dissolved water and stir quickly. The stirring speed is controlled at 400-600r / min. After the rotation and stirring are completed within 3-5 minutes, the magnesium oxide solution is sent to the spraying system.

[0063] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A steel coil end surface spraying equipment, characterized in that: It includes a working platform, a spraying assembly, an axial movement control assembly for controlling the spraying assembly to move axially along the steel coil, a lifting control assembly for controlling the lifting of the spraying assembly, and a rotation control assembly for controlling the spraying assembly to rotate along the central axis of the steel coil, the steel coil and the spraying assembly are located below the working platform, and the axial movement control assembly is installed on the upper surface of the working platform, the lifting control assembly is installed at the output end of the axial movement control assembly, the rotation control assembly is installed at the output end of the lifting control assembly, and the spraying assembly is fixedly installed at the output end of the rotation control assembly; The spraying assembly comprises a spray head for spraying the end surface of the steel coil.

2. The steel coil end surface spraying equipment according to claim 1, characterized in that: The spraying assembly includes a spraying frame, a telescopic arm, a telescopic motor, an inner spray arm and an outer spray arm. The spraying frame is installed at the output end of the rotation control assembly, the telescopic motor and the telescopic arm are fixedly installed on the spraying frame, the inner spray arm and the outer spray arm are installed on the telescopic arm and can perform telescopic movement along the radial direction of the end face of the steel coil under the drive of the telescopic motor; the inner spray arm is equipped with an inner spray head for spraying the inner radius of the end face of the steel coil, and the outer spray arm is equipped with an outer spray head for spraying the outer radius of the end face of the steel coil.

3. The steel coil end surface spraying equipment according to claim 2, characterized in that: A camera is installed on the telescopic arm.

4. The steel coil end surface spraying equipment according to claim 1, characterized in that: The lifting control assembly includes a supporting truss, a lifting truss, a protective cover and a lifting drive mechanism for driving the lifting truss to lift and lower. The supporting truss is installed at the output end of the axial movement control assembly. The lifting truss is suspended in the supporting truss and can perform lifting and lowering movements relative to the supporting truss. The protective cover is suspended at the end of the steel coil on the lower side of the lifting truss. The rotation control assembly is installed on the lifting truss, and the spraying assembly is located in the protective cover.

5. The steel coil end surface spraying equipment according to claim 4, characterized in that: A hot air blower for blowing a hot air flow toward the nozzle is installed above the protective cover.

6. The steel coil end surface spraying equipment according to claim 4, characterized in that: The lifting drive mechanism comprises a lifting motor, a first transmission sprocket, a second transmission sprocket, a third transmission sprocket, a fourth transmission sprocket, a transmission shaft and a lifting block, wherein the lifting motor is fixedly mounted on the upper surface of the supporting truss, the first transmission sprocket is fixedly mounted on the rotating shaft of the lifting motor, the transmission shaft is rotatably mounted on the upper surface of the supporting truss and the second transmission sprocket is fixedly mounted in the middle thereof, and the first transmission sprocket and the second transmission sprocket are driven by a first chain; The transmission shaft is provided with a third transmission sprocket at both ends, and a fourth transmission sprocket is provided at the bottom of both sides of the support truss and directly below the third transmission sprocket, and the third transmission sprocket and the fourth transmission sprocket are driven by a second chain; The lifting block is slidably mounted on the supporting truss, the lifting block is fixedly mounted on the second chain and can be lifted relative to the supporting truss driven by the second chain, and the lifting truss is fixedly mounted on the lifting block.

7. The steel coil end surface spraying equipment according to claim 4, characterized in that: The axial movement control component includes a walking guide rail, a walking rack and a walking motor. The walking guide rail and the walking rack are fixedly mounted on the upper surface of the working platform and are both parallel to the axis of the steel coil. The supporting truss is slidably mounted on the walking guide rail. A walking motor is installed on the supporting truss near the walking rack. A walking gear is fixedly mounted on the output end of the walking motor, and the walking gear is meshed with the walking rack.

8. The steel coil end surface spraying equipment according to claim 4, characterized in that: The rotation control assembly includes a rotating motor, a first rotating sprocket and a second rotating sprocket. The rotating motor is fixedly mounted on the lifting truss, the first rotating sprocket is mounted on the rotating shaft of the rotating motor, the second rotating sprocket is rotatably mounted at the center of the protective cover via the spray rotating shaft, the first rotating sprocket and the second rotating sprocket are driven by a rotating chain, and the spray assembly is fixedly mounted on the spray rotating shaft via a spray mounting seat.

9. A method for spraying magnesium oxide solution on the end surface of a steel coil, using the spraying device as claimed in claim 2, characterized in that: The steps include: Step S1, placing the steel coil on the saddle, adjusting the position of the supporting truss by using the axial movement control component according to the width of the steel coil, so that the distance between the spraying component and the end surface of the steel coil is maintained within a suitable range; adjusting the height of the spraying component by using the lifting control component, so that the rotation center of the spraying component is located on the central axis of the steel coil; Step S2, preparing a magnesium oxide solution, and pressurizing and spraying the magnesium oxide solution through a pump, the working pressure is set to 6.0-8.0 bar, the rotation control component controls the spray component to rotate at 0.5-1.0 r / min, and at the same time, the telescopic motor drives the telescopic arm to first telescope from the outer radius of the steel coil to the inner radius, and then telescope from the inner radius of the steel coil to the outer radius, and reciprocates 2-4 times to ensure that the end surface of the steel coil is evenly sprayed from the outside to the inside; Step S3, the telescopic motor drives the telescopic arm to extend and retract from the inner radius of the steel coil to the outer radius, and rotate to the position of the solution recovery pipeline, and send the externally supplied flushing water to the outer nozzle and the inner nozzle, and backwash the outer nozzle and the inner nozzle until there is no residue in the pipeline, and the flushing waste liquid enters the sewage system through the recovery pipeline.

10. The method for spraying magnesium oxide solution on the end surface of a steel coil according to claim 9, characterized in that: In step S2, the magnesium oxide solution is prepared, including: The configuration weight y of magnesium oxide powder is calculated according to the outer diameter x of the steel coil, where the weight y satisfies: y=6+2*(x-1400), where the unit of x is mm and the unit of y is kg; Mix and dissolve magnesium oxide powder and dissolving water in a mass ratio of (2 / 3-4 / 5):1, and control the dissolving water temperature within the range of 3-8°C; Put magnesium oxide powder into the mixing barrel, quickly add dissolved water and stir quickly. The stirring speed is controlled at 400-600r / min. After the rotation and stirring are completed within 3-5 minutes, the magnesium oxide solution is sent to the spraying system.

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