Sand recovery device based on metal surface sand blasting

Abstract

The invention belongs to the technical field of metal surface machining, and discloses a sand material recovery device based on metal surface sand blasting, which comprises a rack, limiting guide rails mounted on the front side and the rear side of the inner side wall of the rack, and a recovery tank mounted at the bottom end of the rack, a primary screening assembly located over the recycling tank is movably connected between the two limiting guide rails in a clamped mode, the bottom end of the recycling tank fixedly communicates with a discharging tank, and the bottom end of the discharging tank fixedly communicates with a discharging opening. The air inlet assembly and the preliminary screening assembly are used in cooperation, flowing high-pressure hot air serves as power, and the power is converted into power for the movable screen to move relative to the fixed screen through conversion of the air inlet assembly, so that when the device is used for screening, the screening efficiency is improved, and the screening efficiency is improved. The relative movement state of the fixed screen and the movable screen can be always kept, sand is promoted to move continuously, the movement speed of the sand is increased, the blockage phenomenon of the sand is reduced, blockage of the sand is avoided from the source, and the overall recovery efficiency is improved.

Description

Technical Field

[0001] This invention belongs to the field of metal surface processing technology, specifically a sand recycling device based on metal surface sandblasting. Background Technology

[0002] Abrasive recovery devices for metal surface sandblasting are designed to improve the efficiency and environmental friendliness of sandblasting operations. This device minimizes abrasive waste by recovering, cleaning, and reusing the abrasive used in the sandblasting process. This recovery system not only improves work efficiency but also effectively controls waste generated during sandblasting, reducing the environmental burden and making it an indispensable component of industrial sandblasting operations.

[0003] Conventional sand recovery devices mainly consist of a screening device and a recovery device. During screening, the sand is mainly screened through a screen at the top. However, the screen is in a relatively fixed position. Due to the high humidity in the environment, the screen will become clogged after a period of use. The machine must be stopped and cleaned before screening can continue, resulting in low overall screening efficiency.

[0004] At the same time, due to limitations in the screening method and air humidity, after a period of use, a certain amount of sand will adhere to the inner wall of the recycling pipe. Over time, the sand will clump on the inner wall, which will significantly affect the overall recycling process and cause a decrease in recycling efficiency. Summary of the Invention

[0005] The purpose of this invention is to provide a sand recycling device based on metal surface sandblasting, so as to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a sand recovery device based on metal surface sandblasting, comprising a frame and limiting guide rails installed on the front and rear sides of the inner sidewall of the frame, and a recovery tank installed at the bottom of the frame. A preliminary screening component located directly above the recovery tank is movably engaged between the two limiting guide rails. A discharge tank is fixedly connected to the bottom of the recovery tank, and a discharge port is fixedly connected to the bottom of the discharge tank. An air intake component is installed in the middle of the recovery tank through the frame. The top of the air intake component is connected to the bottom of the preliminary screening component. An extension shaft is fixedly installed in the middle of the bottom of the air intake component. A centrifugal tank located inside the discharge tank is fixedly installed at the bottom of the extension shaft. The centrifugal tank rotates relative to the discharge tank. A scraper located inside the recovery tank is fixedly sleeved on the outer side of the extension shaft, and the outer side of the scraper contacts the inner side of the recovery tank. The air intake component delivers high-pressure hot air to the inner wall of the recovery tank. The air intake component drives the preliminary screening component to achieve active screening and avoid blockage. The air intake component drives the extension shaft and the centrifuge tank to complete centrifugal screening and drives the scraper to complete the self-cleaning of the inner wall of the recovery tank.

[0007] When the device is recycling sand, the top of the preliminary screening component should be aligned with the sand recycling port, the device should be powered on, and the discharge port should be aligned with the sand collection port to complete the preliminary preparations for sand recycling.

[0008] As a further technical solution of the present invention, the preliminary screening component includes a fixed screen, the bottom end of which is connected to the top end of a limiting guide rail, and a movable screen is provided at the bottom end of the fixed screen. The fixed screen and the movable screen are in contact with each other, and the same screening holes are provided on both the fixed screen and the movable screen.

[0009] As a further technical solution of the present invention, the front and rear ends of the movable screen are movably engaged with two limiting guide rails, the movable screen moves left and right relative to the fixed screen, and baffles are installed on both the left and right sides of the bottom of the movable screen, the baffles being used to block the gaps in the limiting guide rails.

[0010] As a further technical solution of the present invention, a linkage frame is fixedly installed on one side of the bottom end of the movable screen, and the bottom end of the linkage frame is connected to one side of the top end of the air intake assembly.

[0011] After being filtered by the preliminary screening component at the top, the sand enters the recovery tank and is collected by the recovery tank before entering the centrifuge tank below. When the main shaft rotates, it drives the centrifuge tank to rotate. When the sand enters the centrifuge tank, the centrifuge tank rotates centrifugally, further centrifugating and screening the sand inside the centrifuge tank. The screened sand enters the discharge tank and is discharged through the discharge port, completing the final recovery of the sand.

[0012] As a further technical solution of the present invention, the air intake assembly includes an air collection tank, the outer side of the air collection tank is connected to the inner side of the recovery tank through a frame, an air intake valve is fixedly connected to the right end of the air collection tank, and an exhaust valve is fixedly connected to the left end of the air collection tank.

[0013] As a further technical solution of the present invention, a high-pressure hot air blower is installed on the right side of the recovery tank, and the output end of the high-pressure hot air blower is fixedly connected to a gas supply pipe. The end of the gas supply pipe away from the high-pressure hot air blower passes through one side of the recovery tank and is connected to the air inlet valve. A guide plate corresponding to the exhaust valve is fixedly installed on the side of the gas collection tank away from the air inlet valve.

[0014] As a further technical solution of the present invention, the guide plate is composed of two guide plates, and the guide plates form an angle between them to guide the airflow to both sides and the rear end of the gas collecting tank.

[0015] As a further technical solution of the present invention, a main shaft is movably installed in the middle of the gas collecting tank, and an impeller located inside the gas collecting tank is fixedly sleeved on the outer side of the main shaft, with the bottom end of the impeller connected to the top end of the extension shaft.

[0016] As a further technical solution of the present invention, a first rocker arm is fixedly sleeved on the top of the outer side of the main shaft, and a second rocker arm is movably connected to the end of the first rocker arm away from the main shaft through a rotating shaft. A mounting base is movably connected to the end of the second rocker arm away from the first rocker arm through a rotating shaft, and the top of the mounting base is connected to the bottom of the linkage frame.

[0017] During sand recycling, turning on the high-pressure hot air blower outputs high-pressure hot air into the air supply pipe, which then enters the air collection tank through the air supply pipe and the air inlet valve. At the same time, the high-pressure hot air can be discharged through the exhaust valve and, after being guided by the guide plate, diffuses to various parts of the recycling tank. The flowing hot air heats the sand and accelerates its flow, thus assisting in completing the sand recycling process.

[0018] By directly utilizing high-pressure hot air, through the external input of high-pressure hot air and the diffusion effect of the guide plate, the high-pressure hot air can be quickly diffused to all parts when it enters the recovery tank. The flow of the gas directly acts on the sand inside the recovery tank, and the gravity effect accelerates its rapid flow. The heat of the air is used to heat the sand, reduce its adhesion, and improve the sand recovery efficiency.

[0019] When high-pressure hot air enters the gas collecting tank, it drives the impeller to rotate. At this time, the main shaft rotates accordingly, driving the first rocker arm at its top to rotate. The second rocker arm then swings, applying force to the mounting base. The mounting base then applies force to the movable screen at the top, causing the movable screen to reciprocate left and right under the action of the mounting base. This causes the movable screen to shift relative to the fixed screen, changing the overall area of ​​the two overlapping screening holes. Consequently, the sand inside the screening holes moves and loosens, falling out of the screening holes and reducing clogging.

[0020] By utilizing the coordination between the air intake component and the preliminary screening component, and using flowing high-pressure hot air as power, the air intake component converts the power into the movement of the movable screen relative to the fixed screen. This allows the device to maintain the relative movement of the fixed and movable screens during screening, promoting continuous movement of the sand, increasing its speed, reducing clogging, preventing blockage at the source, and improving overall recovery efficiency.

[0021] Simultaneously, when the main shaft rotates, it synchronously drives the extension shaft at the bottom to rotate. At this time, the scraper on the outer side of the extension shaft rotates circumferentially. When the scraper rotates, it can rub against the inner wall of the recycling tank, thus cleaning the inner wall of the recycling tank. Combined with the exhaust airflow, this can prevent sand from adhering to the inner wall of the recycling tank and avoid clumping.

[0022] By reusing the combination of the air intake assembly, the extension shaft, and the scraper, the air intake assembly enables active screening while also allowing the scraper to rotate circumferentially. Furthermore, the high-temperature, high-pressure air further drives the movement of the sand, reducing its agglomeration and preventing agglomerated sand from affecting the overall recycling process, thus improving the overall recycling efficiency.

[0023] The beneficial effects of this invention are as follows: (1) This invention utilizes the cooperation between the air intake component and the preliminary screening component. The high-pressure hot air is used as the power source. Through the conversion of the air intake component, the power is converted into the power for the movement of the movable screen relative to the fixed screen. This allows the device to maintain the relative movement of the fixed screen and the movable screen during screening, which promotes the continuous movement of the sand, increases the movement speed of the sand, reduces its clogging, avoids clogging from the source, and improves the overall recycling efficiency.

[0024] (2) This invention reuses the cooperation between the air intake component, the extension shaft and the scraper. The air intake component enables active screening, while the scraper can rotate circumferentially. The high temperature and high pressure air further drives the sand to move, reducing its agglomeration and avoiding the impact of agglomerated sand on the overall recycling, thus improving the overall recycling efficiency.

[0025] (3) By directly utilizing high-pressure hot air, the high-pressure hot air input from the outside and the diffusion effect of the guide plate can make the high-pressure hot air quickly diffuse to all places when it is input into the recovery tank, and directly act on the sand inside the recovery tank through the flow of gas, and accelerate its rapid flow with the help of gravity, and use its heat to heat the sand, reduce its adhesion, and improve the sand recovery efficiency. Attached Figure Description

[0026] Figure 1This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a schematic diagram showing the cooperation between the limiting guide rail and the preliminary screening component structure of the present invention; Figure 3 This is an exploded view of the structure of the limiting guide rail and the preliminary screening component of the present invention; Figure 4 This is a separate schematic diagram of the preliminary screening component structure of the present invention; Figure 5 This is a schematic diagram showing the concealed frame and preliminary screening components of the present invention. Figure 6 This is a schematic diagram showing the assembly of the high-pressure hot air blower, the air delivery pipe, and the air intake assembly of the present invention. Figure 7 This is a partial cross-sectional schematic diagram of the air intake assembly structure of the present invention; Figure 8 This is a cross-sectional schematic diagram of the internal structure of the recycling tank of the present invention; Figure 9 This is a cross-sectional schematic diagram of the internal structure of the discharge tank of the present invention.

[0027] In the diagram: 1. Frame; 2. Limiting guide rail; 3. Preliminary screening assembly; 301. Fixed screen; 302. Movable screen; 303. Baffle; 304. Linkage frame; 4. Recovery tank; 5. Discharge tank; 6. Discharge port; 7. Extension shaft; 8. Centrifuge tank; 9. Scraper; 10. High-pressure hot air blower; 11. Air supply pipe; 12. Air inlet assembly; 121. Air collection tank; 122. Air inlet valve; 123. Exhaust valve; 124. Guide plate; 125. Main shaft; 126. Impeller; 127. First rocker arm; 128. Second rocker arm; 129. Mounting base. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] like Figures 1 to 9As shown in the embodiment of the present invention, a sand recovery device based on metal surface sandblasting includes a frame 1 and limiting guide rails 2 installed on the front and rear sides of the inner sidewall of the frame 1, and a recovery tank 4 installed at the bottom of the frame 1. A preliminary screening component 3 located directly above the recovery tank 4 is movably engaged between the two limiting guide rails 2. A discharge tank 5 is fixedly connected to the bottom of the recovery tank 4, and a discharge port 6 is fixedly connected to the bottom of the discharge tank 5. An air intake component 12 is installed in the middle of the recovery tank 4 through the frame. The top of the air intake component 12 is connected to the bottom of the preliminary screening component 3. An extension shaft 7 is fixedly installed in the middle of the bottom of the air intake component 12. A centrifugal tank 8 located inside the discharge tank 5 is fixedly installed at the bottom of the extension shaft 7. The centrifugal tank 8 rotates relative to the discharge tank 5. A scraper 9 located inside the recovery tank 4 is fixedly sleeved on the outer side of the extension shaft 7. The outer side of the scraper 9 contacts the inner side of the recovery tank 4. The air intake assembly 12 delivers high-pressure hot air to the inner wall of the recovery tank 4. The air intake assembly 12 drives the preliminary screening assembly 3 to achieve active screening and avoid blockage. The air intake assembly 12 drives the extension shaft 7 and the centrifuge tank 8 to complete centrifugal screening, and drives the scraper 9 to complete the self-cleaning of the inner wall of the recovery tank 4.

[0030] When the device is recycling sand, the top of the preliminary screening component 3 should be aligned with the sand recycling port, the device should be powered on, and the discharge port 6 should be aligned with the sand collection port to complete the preliminary preparations for sand recycling.

[0031] like Figure 1 and Figure 2 as well as Figure 3 and Figure 4 As shown, the preliminary screening component 3 includes a fixed screen 301, the bottom end of which is connected to the top end of the limiting guide rail 2. A movable screen 302 is provided at the bottom end of the fixed screen 301. The fixed screen 301 and the movable screen 302 are in contact with each other. The fixed screen 301 and the movable screen 302 are provided with the same screening holes. The front and rear ends of the movable screen 302 are movably engaged with the two limiting guide rails 2. The movable screen 302 moves left and right relative to the fixed screen 301. Baffles 303 are installed on both the left and right sides of the bottom end of the movable screen 302. The baffles 303 are used to block the gaps in the limiting guide rails 2. A linkage frame 304 is fixedly installed on one side of the bottom end of the movable screen 302. The bottom end of the linkage frame 304 is connected to one side of the top end of the air intake component 12.

[0032] When the sand enters the recovery tank 4 after being filtered by the preliminary screening component 3 at the top, it can be collected by the recovery tank 4 and then enter the centrifuge tank 8 below. When the main shaft 125 rotates, it can drive the centrifuge tank 8 to rotate. When the sand enters the centrifuge tank 8, the centrifuge tank 8 will rotate centrifugally, further centrifugating and screening the sand inside the centrifuge tank 8. The screened sand enters the discharge tank 5 and is discharged after being collected by the discharge port 6, completing the final recovery of the sand.

[0033] like Figure 5 and Figure 6 as well as Figure 7 and Figure 8 As shown, the air intake assembly 12 includes an air collection tank 121. The outer side of the air collection tank 121 is connected to the inner side of the recovery tank 4 via a frame. An air intake valve 122 is fixedly connected to the right end of the air collection tank 121, and an exhaust valve 123 is fixedly connected to the left end of the air collection tank 121. A high-pressure hot air blower 10 is installed on the right side of the recovery tank 4. An air supply pipe 11 is fixedly connected to the output end of the high-pressure hot air blower 10. The end of the air supply pipe 11 away from the high-pressure hot air blower 10 passes through one side of the recovery tank 4 and is connected to the air intake valve 122. A guide plate 124 corresponding to the exhaust valve 123 is fixedly installed on the side of the air collection tank 121 away from the air intake valve 122. The guide plate 124 consists of two guide plates. Furthermore, the guide plates form an angle to guide the airflow to the two sides and the rear end of the air collection tank 121. A main shaft 125 is movably installed in the middle of the air collection tank 121. An impeller 126 located inside the air collection tank 121 is fixedly sleeved on the outer side of the main shaft 125. The bottom end of the impeller 126 is connected to the top end of the extension shaft 7. A first rocker arm 127 is fixedly sleeved on the top end of the outer side of the main shaft 125. A second rocker arm 128 is movably connected to the end of the first rocker arm 127 away from the main shaft 125 through a rotating shaft. A mounting base 129 is movably connected to the end of the second rocker arm 128 away from the first rocker arm 127 through a rotating shaft. The top end of the mounting base 129 is connected to the bottom end of the linkage frame 304.

[0034] During sand recycling, turning on the high-pressure hot air blower 10 outputs high-pressure hot air into the air supply pipe 11, and the air enters the air collection tank 121 through the air supply pipe 11 and the air inlet valve 122. At the same time, the high-pressure hot air can be discharged through the exhaust valve 123, and after being guided by the guide plate 124, the high-pressure hot air diffuses to various parts of the recycling tank 4. The flowing hot air heats the sand and accelerates its flow, thus assisting in completing the sand recycling process.

[0035] By directly utilizing high-pressure hot air, through the external input of high-pressure hot air and the diffusion effect of the guide plate 124, the high-pressure hot air can quickly diffuse to all places when it enters the recovery tank 4, and directly act on the sand inside the recovery tank 4 through the flow of gas. Combined with the effect of gravity, it accelerates its rapid flow, and uses its heat to heat the sand, reduce its adhesion, and improve the sand recovery efficiency.

[0036] Example: When high-pressure hot air enters the gas collecting tank 121, it drives the impeller 126 to rotate. At this time, the main shaft 125 rotates accordingly, driving the first rocker arm 127 at its top to rotate. The second rocker arm 128 swings accordingly, applying force to the mounting base 129. The mounting base 129 then applies force to the movable screen 302 at its top. The movable screen 302 then moves back and forth under the action of the mounting base 129. At this time, the movable screen 302 is displaced relative to the fixed screen 301. The overall area of ​​the two overlapping screening holes changes accordingly, and the sand inside the screening holes moves and loosens, falling out of the screening holes, reducing clogging.

[0037] By utilizing the cooperation between the air intake component 12 and the preliminary screening component 3, and using the flowing high-pressure hot air as power, the air intake component 12 converts the power into the power for the movement of the movable screen 302 relative to the fixed screen 301. This allows the device to maintain the relative movement of the fixed screen 301 and the movable screen 302 during screening, promoting continuous movement of the sand, increasing the movement speed of the sand, reducing clogging, preventing clogging from the source, and improving the overall recycling efficiency.

[0038] Example: When the main shaft 125 rotates, the extension shaft 7 at the bottom is driven to rotate synchronously. At this time, the scraper 9 on the outer side of the extension shaft 7 rotates circumferentially. When the scraper 9 rotates, it can rub against the inner wall of the recycling tank 4. At this time, the inner wall of the recycling tank 4 can be cleaned by friction. With the exhaust airflow, the sand can be prevented from adhering to the inner wall of the recycling tank 4 and from clumping.

[0039] By reusing the cooperation between the air intake assembly 12, the extension shaft 7, and the scraper 9, the air intake assembly 12 can achieve active screening while the scraper 9 can rotate circumferentially. Furthermore, the high-temperature and high-pressure air can further drive the sand to move, reduce its agglomeration, avoid the impact of agglomerated sand on the overall recycling, and improve the overall recycling efficiency.

[0040] Working principle and usage process: When the device is recycling sand, the top of the preliminary screening component 3 should be aligned with the sand recycling port, the device should be powered on, and the discharge port 6 should be aligned with the sand collection port to complete the preliminary preparations for sand recycling. During sand recycling, the high-pressure hot air blower 10 is turned on to output high-pressure hot air into the air supply pipe 11, and enters the air collection tank 121 through the air supply pipe 11 and the air inlet valve 122. At the same time, the high-pressure hot air can be discharged through the exhaust valve 123, and after being guided by the guide plate 124, the high-pressure hot air diffuses to various parts of the recycling tank 4. The flowing hot air heats the sand and accelerates its flow, thus assisting in completing the sand recycling process. When high-pressure hot air enters the gas collecting tank 121, it drives the impeller 126 to rotate. At this time, the main shaft 125 rotates accordingly, driving the first rocker arm 127 at its top to rotate. The second rocker arm 128 swings accordingly, and at the same time, it applies a force to the mounting base 129. The mounting base 129 then applies a force to the movable screen 302 at its top. The movable screen 302 then moves back and forth under the action of the mounting base 129. At this time, the movable screen 302 is displaced relative to the fixed screen 301. The overall area of ​​the two overlapping screening holes changes accordingly, and the sand inside the screening holes moves and loosens, falling out of the screening holes and reducing clogging. At the same time, when the main shaft 125 rotates, it synchronously drives the extension shaft 7 at the bottom to rotate. At this time, the scraper 9 on the outer side of the extension shaft 7 rotates circumferentially. When the scraper 9 rotates, it can rub against the inner wall of the recycling tank 4. At this time, the inner wall of the recycling tank 4 can be cleaned by friction. With the exhaust airflow, it can prevent sand from adhering to the inner wall of the recycling tank 4 and avoid clumping. When the sand enters the recovery tank 4 after being filtered by the preliminary screening component 3 at the top, it can be collected by the recovery tank 4 and then enter the centrifuge tank 8 below. When the main shaft 125 rotates, it can drive the centrifuge tank 8 to rotate. When the sand enters the centrifuge tank 8, the centrifuge tank 8 will rotate centrifugally, further centrifugating and screening the sand inside the centrifuge tank 8. The screened sand enters the discharge tank 5 and is discharged after being collected by the discharge port 6, completing the final recovery of the sand.

[0041] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A metal surface sand blasting based sand recycling device, comprising a frame (1) and a limiting guide rail (2) installed on the front and back sides of the inner side wall of the frame (1), and a recycling tank (4) installed at the bottom end of the frame (1), characterized in that: Two said limit guide rail (2) between the activity card joint located in the recycling tank (4) above the preliminary screening assembly (3), the recycling tank (4) bottom fixed communication has discharge tank (5), the discharge tank (5) bottom fixed communication has discharge port (6), the recycling tank (4) middle part is installed by rack air inlet assembly (12), the air inlet assembly (12) top and preliminary screening assembly (3) bottom end is connected, the air inlet assembly (12) bottom end middle part fixedly installed has extension shaft (7), the extension shaft (7) bottom fixedly installed has located in the discharge tank (5) inside centrifugal tank (8), the centrifugal tank (8) relative to discharge tank (5) rotation, the extension shaft (7) outside fixed sleeve has located in the recycling tank (4) inside scraper (9), the scraper (9) outside and recycling tank (4) inside surface contact; The air inlet assembly (12) exports high pressure hot air to act on the inner wall of the recycling tank (4), the air inlet assembly (12) drives the preliminary screening assembly (3) to realize active screening to avoid blockage, the air inlet assembly (12) drives the extension shaft (7) and the centrifugal tank (8) to complete the centrifugal screening, and drives the scraper (9) to complete the self cleaning of the inner wall of the recycling tank (4).

2. A grit recovery device based on sandblasting of metal surfaces according to claim 1, characterized in that: The preliminary screening assembly (3) comprises a fixed screen (301), the bottom end of the fixed screen (301) is connected with the top end of the limiting guide rail (2), the bottom end of the fixed screen (301) is provided with a movable screen (302), the fixed screen (301) and the movable screen (302) are in contact, and the same screening holes are formed in the fixed screen (301) and the movable screen (302).

3. A grit recovery device based on sandblasting of metal surfaces according to claim 2, characterized in that: The front and rear ends of the movable screen (302) are movably connected between the two limiting guide rails (2), the movable screen (302) is displaced left and right relative to the fixed screen (301), and the left and right sides of the bottom end of the movable screen (302) are provided with baffles (303), which are used for blocking the gaps of the limiting guide rails (2).

4. A grit recovery device based on sandblasting of metal surfaces according to claim 3, characterized in that: One side of the bottom end of the movable screen (302) is fixedly provided with a linkage frame (304), and the bottom end of the linkage frame (304) is connected with one side of the top end of the air inlet assembly (12).

5. A grit recovery device based on sandblasting of metal surfaces according to claim 4, characterized in that: The air inlet assembly (12) comprises a gas collecting tank (121), the outer side of the gas collecting tank (121) is connected with the inner side of the recycling tank (4) through a rack, the right end of the gas collecting tank (121) is fixedly communicated with an air inlet valve (122), and the left end of the gas collecting tank (121) is fixedly communicated with an air outlet valve (123).

6. A grit recovery device based on sandblasting of metal surfaces according to claim 5, characterized in that: A high pressure hot air machine (10) is installed on the right side of the recycling tank (4), the output end of the high pressure hot air machine (10) is fixedly communicated with a gas conveying pipe (11), one end of the gas conveying pipe (11) away from the high pressure hot air machine (10) penetrates through one side of the recycling tank (4) and is in communication with the air inlet valve (122), and the side of the gas collecting tank (121) away from the air inlet valve (122) is fixedly provided with a guide plate (124) corresponding to the air outlet valve (123).

7. A grit recovery device based on sandblasting of metal surfaces according to claim 6, characterized in that: The guide plate (124) is composed of two guide plates, and the guide plates form an included angle for guiding the airflow to both sides and the rear end position of the gas collecting tank (121).

8. A grit recovery device based on sandblasting of metal surfaces according to claim 7, characterized in that: The middle part of the gas collecting tank (121) is movably provided with a main shaft (125), and the outer side of the main shaft (125) is fixedly sleeved with an impeller (126) located in the gas collecting tank (121), and the bottom end of the impeller (126) is connected with the top end of the extension shaft (7).

9. A grit recovery device based on sandblasting of metal surfaces according to claim 8, characterized in that: The top end of the outer side of the main shaft (125) is fixedly sleeved with a first rocker arm (127), one end of the first rocker arm (127) away from the main shaft (125) is movably connected with a second rocker arm (128) through a rotating shaft, one end of the second rocker arm (128) away from the first rocker arm (127) is movably connected with a mounting seat (129) through a rotating shaft, and the top end of the mounting seat (129) is connected with the bottom end of the linkage frame (304).

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