Environment-friendly steel surface coating high-adhesion treatment device and method

Abstract

The invention relates to the technical field of steel treatment devices, and discloses an environment-friendly steel surface coating high-adhesion treatment device and method.The environment-friendly steel surface coating high-adhesion treatment device comprises a treatment table, a three-axis movement platform is mounted on a top plate of the treatment table, a mounting plate is fixedly mounted at the movement end of the three-axis movement platform, and a sliding groove is formed in the outer surface of the mounting plate; a sliding block is slidably installed on the inner wall of the sliding groove, and a clamping hoop is fixedly installed on the outer surface of the sliding block. When the sand blasting nozzle is seriously blocked and the whole sand blasting head moves upwards to the touch switch, the sliding block touches the touch switch, the sand blasting operation of the sand blasting head is stopped, meanwhile, the end of the push plate drives the clamping block to be pulled out of the clamping groove formed in the side edge of the movable plate through the supporting rod under the extrusion effect of the inclined face of the trapezoidal groove, the movable plate is unlocked, and the sand blasting head can be conveniently and rapidly moved. And the movable plate is rapidly switched to the position under the sand blasting head under the tension effect of the tension spring rod, replacement operation of the sand blasting nozzle is achieved, and continuous sand blasting operation can be conveniently conducted on steel.

Description

Technical Field

[0001] The present invention relates to the technical field of steel material processing devices, and in particular to an environmentally friendly steel material surface coating high-adhesion processing device and method. Background Art

[0002] The surface of steel is a special steel that can work repeatedly under dynamic load conditions and has repeatable expansion and contraction properties. In order to extend the service life of the steel surface in an exposed environment, a suitable coating material is required to reduce the outer layer of the steel from being affected by the environment during use, causing oxidation, corrosion, roughness, and cracking. Currently, the steel surface before painting is mainly sandblasted to obtain a certain degree of cleanliness and different degrees of roughness on the steel surface, thereby improving the mechanical properties of the steel surface.

[0003] The existing surface rust removal device and method for steel (Announcement No.: CN103341827B) have at least the following disadvantages: the above-mentioned patent uses a high-pressure pump to inject clean water into the sandblasting nozzle through a water injection pipeline; the cylinder descends, driving the sand suction tube to descend and insert into the sand layer of the sand box; when the high-pressure pump flushes water into the sandblasting nozzle, a vacuum is generated, and the air pressure difference is used to suck the sand in the sand box into the sandblasting nozzle through the sand suction tube. After mixing with water, the workpiece entering the inner cavity of the primary sandblasting tube is sandblasted and rust removed; because during the sandblasting operation, the surface of the gravel will adhere to the device brought off the steel surface, these impurities can easily clog the sandblasting nozzle, resulting in the sandblasting nozzle needing to be stopped and manually replaced after being clogged, affecting the treatment efficiency of the steel surface. Summary of the Invention

[0004] The purpose of the present invention is to solve the shortcomings of the prior art and to propose an environmentally friendly steel surface coating high adhesion treatment device and method.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions:

[0006] A device for processing surface coatings of environmentally friendly steel with high adhesion comprises a processing table, the top plate of the processing table being installed with a three-axis motion platform, the moving end of the three-axis motion platform being fixedly installed with a mounting plate, the outer surface of the mounting plate being provided with a slide groove, the inner wall of the slide groove being slidably installed with a slider, the outer surface of the slider being fixedly installed with a clamp, the inner wall of the clamp being fixedly installed with a sandblasting head, the discharge end of the sandblasting head being fixedly installed with a movable frame, the inner wall of the movable frame being slidably installed with a movable plate, the bottom of the movable plate being fixedly installed with two sandblasting nozzles matching the sandblasting head, and the outer surface of the sandblasting head being installed with a blockage detection mechanism.

[0007] In this embodiment, the blockage detection mechanism includes a connecting pipe that passes through and is fixedly installed on the outer surface of the sandblasting head. A movable rod is slidably installed through the end of the connecting pipe away from the sandblasting head. A movable plug is fixedly installed on one end of the movable rod. The movable plug is slidably installed on the inner wall of the connecting pipe. A guide rod is fixedly installed on the other end of the movable rod. An oblique groove is provided through the outer surface of the mounting plate, and the guide rod is slidably installed on the inner wall of the oblique groove.

[0008] In this embodiment, a compression spring is sleeved on the outer surface of the moving rod, and the compression spring is arranged between the movable plug and the end wall of the communicating pipe.

[0009] In this embodiment, a switching mechanism is installed between the movable frame and the movable plate. The switching mechanism includes a tension spring rod fixedly installed on one end of the movable frame. The telescopic end of the tension spring rod passes through the inner wall of the movable frame and is fixedly installed on the end of the movable plate. A limiting component is installed between the movable frame and the movable plate.

[0010] In this embodiment, the limiting assembly includes a C-shaped plate fixedly mounted on the outer surface of the movable frame, a support rod is slidably mounted through the outer surface of the C-shaped plate, a clamping block is fixedly mounted on one end of the support rod, the clamping block is arranged through the outer surface of the C-shaped plate, a clamping slot matching the clamping block is provided on the side of the movable plate, a reset spring is sleeved on the outer surface of the support rod, the reset spring is arranged between the C-shaped plate and the clamping block, and an unlocking assembly is installed between the support rod and the mounting plate.

[0011] In this embodiment, the unlocking assembly includes a push plate fixedly mounted on the end of the support rod away from the blocking block, and a trapezoidal groove is correspondingly provided on the outer surface of the mounting plate close to the push plate, and the end of the push plate is slidably mounted on the inner wall of the trapezoidal groove.

[0012] In this embodiment, a touch switch is fixedly installed on the top wall of the slide, a displacement sensor is fixedly installed on the outer surface of the mounting plate close to the slide, and a displacement block is fixedly installed on the outer surface of the slider, and the displacement block matches the displacement sensor.

[0013] A method for using an environmentally friendly steel surface coating high adhesion treatment device comprises the following steps:

[0014] S1: When in use, the steel material to be processed is placed on the processing table, and the sandblasting head is connected to the external sandblasting tank, so that the sandblasting head can sandblast the surface of the steel material under the action of the three-axis motion platform;

[0015] S2: When the sandblasting nozzle is partially blocked by gravel in the initial state, the pressure inside the sandblasting head will increase, pushing the movable plug, which can apply thrust to the guide rod through the moving rod. Since the guide rod is slidably installed inside the inclined groove opened on the mounting plate, the guide rod can drive the sandblasting head upward as a whole when it moves, avoiding excessive pressure of gravel sprayed out when the sandblasting nozzle is blocked, which may cause damage to the steel surface;

[0016] S3: When the sandblasting nozzle is seriously clogged and the sandblasting head moves to the touch switch as a whole, the slider touches the touch switch to stop the sandblasting operation of the sandblasting head. At the same time, the end of the push plate will be squeezed by the inclined surface of the trapezoidal groove and the support rod will drive the block to be pulled out from the slot opened on the side of the movable plate, unlocking the movable plate. Under the tension of the tension spring rod, the movable plate is quickly switched to the bottom of the sandblasting head, thereby realizing the replacement operation of the sandblasting nozzle and continuously sandblasting the steel.

[0017] The beneficial effects of the present invention are:

[0018] 1. When the sandblasting nozzle is partially blocked by gravel in the initial state, the pressure inside the sandblasting head will increase, pushing the movable plug, so that the movable plug can apply thrust to the guide rod through the moving rod. Since the guide rod is slidably installed inside the inclined groove opened on the mounting plate, the guide rod can drive the sandblasting head upward as a whole when it moves, avoiding excessive pressure of gravel sprayed out when the sandblasting nozzle is blocked, which may cause damage to the steel surface;

[0019] 2. When the sandblasting nozzle is seriously clogged and the sandblasting head moves to the touch switch as a whole, the slider touches the touch switch to stop the sandblasting operation of the sandblasting head. At the same time, the end of the push plate will be squeezed by the inclined surface of the trapezoidal groove and the support rod will drive the card block to be pulled out from the card slot opened on the side of the movable plate, thereby unlocking the movable plate. Under the tension of the tension spring rod, the movable plate is quickly switched to the bottom of the sandblasting head, thereby realizing the replacement operation of the sandblasting nozzle, so as to continuously sandblast the steel and improve the surface treatment efficiency of the steel. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is a schematic diagram of the overall structure of an environmentally friendly steel surface coating high adhesion treatment device proposed by the present invention;

[0021] Figure 2 This is a schematic diagram of the mounting plate structure of an environmentally friendly steel surface coating high adhesion treatment device proposed by the present invention;

[0022] Figure 3 This is a schematic diagram of the sandblasting head structure of an environmentally friendly steel surface coating high adhesion treatment device proposed by the present invention;

[0023] Figure 4This is a schematic diagram of the bottom structure of a movable frame of an environmentally friendly steel surface coating high adhesion treatment device proposed by the present invention;

[0024] Figure 5 This is a schematic diagram of the push plate structure of an environmentally friendly steel surface coating high adhesion treatment device proposed by the present invention;

[0025] Figure 6 This is a schematic diagram of the movable plate structure of an environmentally friendly steel surface coating high adhesion treatment device proposed by the present invention;

[0026] Figure 7 for Figure 3 A magnified view of the structure at center A.

[0027] In the figure: 1. Processing table; 2. Three-axis motion platform; 3. Mounting plate; 4. Slide; 5. Slider; 6. Clamp; 7. Sandblasting head; 8. Movable frame; 9. Movable plate; 10. Sandblasting nozzle; 11. Connecting pipe; 12. Movable rod; 13. Movable plug; 14. Compression spring; 15. Guide rod; 16. Inclined groove; 17. Touch switch; 18. Displacement sensor; 19. Displacement block; 20. Tension spring rod; 21. C-type plate; 22. Support rod; 23. Card block; 24. Reset spring; 25. Push plate; 26. Trapezoidal groove; 27. Card slot. DETAILED DESCRIPTION

[0028] 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 only part of the embodiments of the present invention, rather than all the embodiments.

[0029] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0030] Refer to the attached Figure 1 -Attached Figure 7 , an environmentally friendly steel surface coating high adhesion processing device, comprising a processing table 1, the processing table 1 is equipped with a protective cover with an openable door on all sides, and a recovery groove for recovering sand and gravel into the sandblasting tank is reserved at the edge of the processing table 1; a three-axis motion platform 2 is installed on the top plate of the processing table 1, and a mounting plate 3 is fixedly installed on the moving end of the three-axis motion platform 2, and a slide groove 4 is provided on the outer surface of the mounting plate 3, and a slider 5 is slidably installed on the inner wall of the slide groove 4, and a clamp 6 is fixedly installed on the outer surface of the slider 5, and a sandblasting head 7 is fixedly installed on the inner wall of the clamp 6, and a movable frame 8 is fixedly installed on the discharge end of the sandblasting head 7, and a movable plate 9 is slidably installed on the inner wall of the movable frame 8, and two sandblasting nozzles 10 matching the sandblasting head 7 are fixedly installed on the bottom of the movable plate 9, and a blockage detection mechanism is installed on the outer surface of the sandblasting head 7.

[0031] During use, the steel to be processed is placed on the processing table 1, and the sandblasting head 7 is connected to the external sandblasting tank, so that the sandblasting head 7 can sandblast the surface of the steel under the action of the three-axis motion platform 2, so as to remove the oxide layer on the surface of the steel and increase the roughness of the steel surface, thereby improving the adhesion effect of the subsequent environmentally friendly steel surface coating.

[0032] In this embodiment, the blockage detection mechanism includes a connecting pipe 11 that passes through and is fixedly installed on the outer surface of the sandblasting head 7. A moving rod 12 is slidably installed through the end portion of the connecting pipe 11 away from the sandblasting head 7. A movable plug 13 is fixedly installed on one end portion of the movable rod 12. The movable plug 13 is slidably installed on the inner wall of the connecting pipe 11. A guide rod 15 is fixedly installed on the other end portion of the movable rod 12. An inclined groove 16 is penetrated through the outer surface of the mounting plate 3. The guide rod 15 is slidably installed on the inner wall of the inclined groove 16. A compression spring 14 is sleeved on the outer surface of the movable rod 12. The compression spring 14 is arranged between the movable plug 13 and the end wall of the connecting pipe 11.

[0033] When the sandblasting nozzle 10 is partially clogged with sand in the initial state, the pressure inside the sandblasting head 7 will increase, so that the movable plug 13 will be pushed, and the movable plug 13 can apply a thrust to the guide rod 15 through the moving rod 12. Since the guide rod 15 is slidably installed inside the inclined groove 16 opened on the mounting plate 3, the guide rod 15 can drive the sandblasting head 7 to lift upward as a whole when moving, thereby preventing the sandblasting head 7 from being sprayed out with excessive pressure when the sandblasting nozzle 10 is partially clogged, thereby preventing the steel surface from being damaged.

[0034] In this embodiment, a switching mechanism is installed between the movable frame 8 and the movable plate 9, and the switching mechanism includes a tension spring rod 20 fixedly mounted on one end of the movable frame 8. The telescopic end of the tension spring rod 20 passes through the inner wall of the movable frame 8 and is fixedly mounted with the end of the movable plate 9. A limiting assembly is installed between the movable frame 8 and the movable plate 9. The limiting assembly includes a C-shaped plate 21 fixedly mounted on the outer surface of the movable frame 8. A support rod 22 is slidably mounted on the outer surface of the C-shaped plate 21. A clamping block 23 is fixedly mounted on one end of the support rod 22. The clamping block 23 passes through the inner wall of the movable frame 8 and is fixedly mounted with the end of the movable plate 9. The outer surface of the C-shaped plate 21 is arranged, and a card slot 27 matching the card block 23 is opened on the side of the movable plate 9. The outer surface of the support rod 22 is sleeved with a return spring 24, and the return spring 24 is arranged between the C-shaped plate 21 and the card block 23. An unlocking assembly is installed between the support rod 22 and the mounting plate 3. The unlocking assembly includes a push plate 25 fixedly mounted on the end of the support rod 22 away from the card block 23. The outer surface of the mounting plate 3 close to the push plate 25 is correspondingly provided with a trapezoidal groove 26, and the end of the push plate 25 is slidably installed with the inner wall of the trapezoidal groove 26.

[0035] When the sandblasting nozzle 10 is seriously clogged and the sandblasting head 7 is moved to the touch switch 17 as a whole, the slider 5 touches the touch switch 17 to stop the sandblasting operation of the sandblasting head 7. At the same time, the end of the push plate 25 will be driven by the support rod 22 under the inclined extrusion action of the trapezoidal groove 26 to drive the card block 23 to be pulled out from the card slot 27 opened on the side of the movable plate 9, thereby unlocking the movable plate 9. Under the tension of the tension spring rod 20, the movable plate 9 is quickly switched to the bottom of the sandblasting head 7, thereby realizing the replacement operation of the sandblasting nozzle 10 and continuously sandblasting the steel.

[0036] In this embodiment, a touch switch 17 is fixedly installed on the top wall of the slide 4, a displacement sensor 18 is fixedly installed on the outer surface of the mounting plate 3 close to the slide 4, and a displacement block 19 is fixedly installed on the outer surface of the slider 5, and the displacement block 19 matches the displacement sensor 18.

[0037] When the sandblasting head 7 moves upward as a whole, the displacement sensor 18 will detect the movement of the displacement block 19 installed on the slider 5, causing the displacement sensor 18 to slow down the overall movement speed of the mounting plate 3 driven by the three-axis motion platform 2 through the external controller, thereby avoiding the sandblasting range of the sandblasting head 7 becoming smaller when blocked while the movement speed remains unchanged, resulting in uneven sandblasting on the steel surface.

[0038] A method for using an environmentally friendly steel surface coating high adhesion treatment device comprises the following steps:

[0039] S1: When in use, the steel material to be processed is placed on the processing table 1, and the connection between the sandblasting head 7 and the external sandblasting tank is connected, so that the sandblasting head 7 can sandblast the surface of the steel material under the action of the three-axis motion platform 2;

[0040] S2: When the sandblasting nozzle 10 is partially clogged with sand in the initial state, the pressure inside the sandblasting head 7 will increase, pushing the movable plug 13, so that the movable plug 13 can apply a thrust to the guide rod 15 through the moving rod 12. Since the guide rod 15 is slidably installed inside the inclined groove 16 provided on the mounting plate 3, the guide rod 15 can drive the sandblasting head 7 to lift upward as a whole when moving, thereby preventing the sandblasting nozzle 10 from being sprayed out with excessive pressure when the sandblasting nozzle 10 is partially clogged, thereby preventing the steel surface from being damaged.

[0041] S3: When the sandblasting nozzle 10 is seriously clogged and the sandblasting head 7 moves to the touch switch 17 as a whole, the slider 5 touches the touch switch 17 to stop the sandblasting operation of the sandblasting head 7. At the same time, the end of the push plate 25 will be squeezed by the inclined surface of the trapezoidal groove 26 and the support rod 22 to drive the block 23 to be pulled out from the slot 27 opened on the side of the movable plate 9, thereby unlocking the movable plate 9. Under the tension of the tension spring rod 20, the movable plate 9 is quickly switched to the bottom of the sandblasting head 7, thereby realizing the replacement operation of the sandblasting nozzle 10 and continuously sandblasting the steel.

[0042] From the above description, it can be seen that the above-mentioned embodiment of the present invention achieves the following technical effects: when in use, the steel material to be processed is placed on the processing table 1, and the communication between the sandblasting head 7 and the external sandblasting tank is connected, so that the sandblasting head 7 can perform sandblasting on the surface of the steel material under the action of the three-axis motion platform 2, so as to remove the oxide layer on the surface of the steel material and increase the roughness of the steel material surface, thereby improving the adhesion effect of the subsequent environmentally friendly steel surface coating;

[0043] When the sandblasting nozzle 10 is partially clogged with sand in the initial state, the pressure inside the sandblasting head 7 will increase, pushing the movable plug 13, so that the movable plug 13 can apply a thrust to the guide rod 15 through the moving rod 12. Since the guide rod 15 is slidably mounted inside the inclined groove 16 provided on the mounting plate 3, the guide rod 15 can drive the sandblasting head 7 to lift upward as a whole when moving, thereby preventing the sandblasting nozzle 10 from being sprayed out with excessive pressure when the sandblasting nozzle 10 is partially clogged, thereby preventing the steel surface from being damaged.

[0044] When the sandblasting nozzle 10 is seriously clogged and the sandblasting head 7 is moved to the touch switch 17 as a whole, the slider 5 touches the touch switch 17 to stop the sandblasting operation of the sandblasting head 7. At the same time, the end of the push plate 25 will be driven by the support rod 22 under the inclined extrusion action of the trapezoidal groove 26 to drive the card block 23 to be pulled out from the card slot 27 opened on the side of the movable plate 9, thereby unlocking the movable plate 9. Under the tension of the tension spring rod 20, the movable plate 9 is quickly switched to the bottom of the sandblasting head 7, thereby realizing the replacement operation of the sandblasting nozzle 10 and continuously sandblasting the steel.

[0045] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. An environmentally friendly steel surface coating high adhesion treatment device, comprising a treatment table (1), a top plate of the treatment table (1) is mounted with a three-axis motion platform (2), a moving end of the three-axis motion platform (2) is fixedly mounted with a mounting plate (3), characterized in that: The outer surface of the mounting plate (3) is provided with a slide groove (4), the inner wall of the slide groove (4) is slidably mounted with a slider (5), the outer surface of the slider (5) is fixedly mounted with a clamp (6), the inner wall of the clamp (6) is fixedly mounted with a sandblasting head (7), the discharge end of the sandblasting head (7) is fixedly mounted with a movable frame (8), the inner wall of the movable frame (8) is slidably mounted with a movable plate (9), the bottom of the movable plate (9) is fixedly mounted with two sandblasting nozzles (10) matching the sandblasting head (7), and the outer surface of the sandblasting head (7) is mounted with a blockage detection mechanism.

2. The environmentally friendly steel surface coating high adhesion treatment device according to claim 1, characterized in that: The blockage detection mechanism comprises a connecting pipe (11) which is fixedly mounted on the outer surface of the sandblasting head (7); a movable rod (12) is slidably mounted on one end of the connecting pipe (11) away from the sandblasting head (7); a movable plug (13) is fixedly mounted on one end of the movable rod (12); the movable plug (13) is slidably mounted on the inner wall of the connecting pipe (11); a guide rod (15) is fixedly mounted on the other end of the movable rod (12); an oblique groove (16) is formed on the outer surface of the mounting plate (3); and the guide rod (15) is slidably mounted on the inner wall of the oblique groove (16).

3. The environmentally friendly steel surface coating high adhesion treatment device according to claim 2, characterized in that: The outer surface of the moving rod (12) is sleeved with a compression spring (14), and the compression spring (14) is arranged between the movable plug (13) and the end wall of the connecting pipe (11).

4. The environmentally friendly steel surface coating high adhesion treatment device according to claim 1, characterized in that: A switching mechanism is installed between the movable frame (8) and the movable plate (9), and the switching mechanism includes a tension spring rod (20) fixedly installed at one end of the movable frame (8), the telescopic end of the tension spring rod (20) passes through the inner wall of the movable frame (8) and is fixedly installed with the end of the movable plate (9), and a limiting component is installed between the movable frame (8) and the movable plate (9).

5. The environmentally friendly steel surface coating high adhesion treatment device according to claim 4, characterized in that: The limiting assembly comprises a C-shaped plate (21) fixedly mounted on the outer surface of the movable frame (8); a support rod (22) is slidably mounted on the outer surface of the C-shaped plate (21); a clamping block (23) is fixedly mounted on one end of the support rod (22); the clamping block (23) is arranged to penetrate the outer surface of the C-shaped plate (21); a clamping groove (27) matching the clamping block (23) is provided on the side of the movable plate (9); a reset spring (24) is sleeved on the outer surface of the support rod (22); the reset spring (24) is arranged between the C-shaped plate (21) and the clamping block (23); and an unlocking assembly is installed between the support rod (22) and the mounting plate (3).

6. The environmentally friendly steel surface coating high adhesion treatment device according to claim 5, characterized in that: The unlocking assembly includes a push plate (25) fixedly mounted on an end of the support rod (22) away from the clamping block (23); a trapezoidal groove (26) is correspondingly provided on the outer surface of the mounting plate (3) on the side close to the push plate (25); and the end of the push plate (25) is slidably mounted on the inner wall of the trapezoidal groove (26).

7. The environmentally friendly steel surface coating high adhesion treatment device according to claim 1, characterized in that: A touch switch (17) is fixedly mounted on the top wall of the chute (4), a displacement sensor (18) is fixedly mounted on the outer surface of the mounting plate (3) close to the chute (4), and a displacement block (19) is fixedly mounted on the outer surface of the slider (5), and the displacement block (19) matches the displacement sensor (18).

8. A method for using an environmentally friendly steel surface coating high adhesion treatment device, characterized in that: The environmentally friendly steel surface coating high adhesion treatment device according to any one of claims 1 to 7 comprises the following steps: S1: When in use, the steel material to be processed is placed on the processing table (1), and the sandblasting head (7) is connected to the external sandblasting tank, so that the sandblasting head (7) can sandblast the surface of the steel material under the action of the three-axis motion platform (2); S2: When the sandblasting nozzle (10) is partially blocked by gravel in the initial state, the pressure inside the sandblasting head (7) increases, so that the movable plug (13) is pushed, and the movable plug (13) can apply a thrust to the guide rod (15) through the moving rod (12). Since the guide rod (15) is slidably mounted inside the inclined groove (16) provided on the mounting plate (3), the guide rod (15) can drive the sandblasting head (7) to lift upward as a whole when moving, thereby preventing the sandblasting nozzle (10) from being sprayed out with excessive pressure when the sandblasting nozzle (10) is blocked, thereby preventing the steel surface from being damaged. S3: When the sandblasting nozzle (10) is seriously clogged and the sandblasting head (7) as a whole moves to the touch switch (17), the slider (5) touches the touch switch (17) to stop the sandblasting operation of the sandblasting head (7). At the same time, the end of the push plate (25) will be driven by the support rod (22) under the inclined extrusion of the trapezoidal groove (26) to pull the card block (23) out of the card slot (27) opened on the side of the movable plate (9), unlocking the movable plate (9). Under the tension of the tension spring rod (20), the movable plate (9) is quickly switched to the position directly below the sandblasting head (7), thereby realizing the replacement operation of the sandblasting nozzle (10) so as to continuously perform sandblasting operation on the steel.

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