Remote grinding material continuous supply quantitative sand feeding system

Abstract

The invention relates to the technical field of abrasive material supply, and discloses a remote abrasive material continuous supply quantitative sand feeding system which comprises a remote abrasive material supply module and a continuous quantitative sand supply module, the remote abrasive material supply module comprises a sand storage box, a connecting hose and a sand supply tank, the connecting hose is provided with a non-return assembly, the sand supply tank is provided with an air blowing valve, and the sand supply tank is provided with a sand outlet; the continuous quantitative sand supply module comprises a sand blasting assembly and a sand supply hopper, the sand supply hopper is provided with a sand inlet, a sand outlet is communicated with the sand inlet through a sand supply pipe, the sand supply tank is provided with a first exhaust valve, the sand supply hopper is provided with a second exhaust valve, the sand blasting assembly comprises a sand supply roller and a driving part, and the sand supply roller is provided with a tooth groove; the non-return assembly is arranged to separate the sand storage box from the sand supply tank, so that the sand storage box is in a normal-pressure state, materials can be fed into the sand storage box at any time, and abrasive fine sand can be continuously conveyed for a long distance under the action of dual driving of gravity and air pressure difference by combining with mutual matching of the non-return assembly and the blowing valve.

Description

Technical Field

[0001] This invention relates to the field of abrasive supply technology, and more specifically to a remote continuous abrasive supply quantitative sand feeding system. Background Technology

[0002] Traditional machining methods are prone to problems such as rapid tool wear, low machining accuracy, and thermal deformation when processing high-hardness materials or complex irregular parts. They are difficult to meet the stringent requirements for workpiece surface quality and machining accuracy in fields such as aerospace, automotive manufacturing, and electronic components. However, abrasive jet processing, with its advantages of non-contact and cold processing, can achieve high-precision cutting, rust removal, polishing, and other operations. It places extremely high demands on the stability of the abrasive supply system and the accuracy of abrasive delivery.

[0003] The sand supply methods for abrasive jet processing include pre-mixing sand supply and post-mixing sand supply. Pre-mixing sand supply usually uses a pressurized method to input the abrasive fine sand in the storage tank into the mixing tank, and then water is added to the mixing tank to form a mixed slurry. Finally, it is output by pressurizing. Post-mixing sand supply usually occurs after the high-pressure water jet is formed. The abrasive fine sand is then pressurized in the storage tank to be transported to the high-pressure water jet for mixing, thereby forming a mixed abrasive water jet.

[0004] However, both of these sand supply methods require the storage tank to be restored to normal pressure before refilling after the abrasive fine sand in the storage tank is used up, making the abrasive jet processing unsustainable. Furthermore, in existing abrasive jet processing systems, the abrasive fine sand migrates radially during long-distance transport due to the difference in density between itself and the frictional resistance of the pipe wall, easily forming layered accumulations in horizontal pipe sections, continuously reducing the effective flow cross-section of the pipe. Fluctuations in the transport velocity trigger periodic oscillations of deposition and resuspension, resulting in low-frequency, large-amplitude fluctuations in the concentration of the jet abrasive, disrupting the consistency of the processing energy density. At the same time, existing abrasive jet processing cannot precisely control the amount of abrasive fine sand mixed each time, leading to uneven concentration of the output abrasive fine sand and inconsistent surface quality. To address these issues, we propose a remote continuous abrasive supply quantitative sand feeding system. Summary of the Invention

[0005] The present invention aims to provide a remote continuous abrasive feeding and quantitative sand feeding system to solve the problems of traditional sand supply systems that cannot continuously supply sand, have poor stability in long-distance abrasive transportation, and lack sufficient accuracy in quantitative abrasive output.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a remote abrasive continuous supply and quantitative sand feeding system, comprising a remote abrasive supply module and a continuous quantitative sand supply module. The remote abrasive supply module includes a sand storage tank, a connecting hose, and a sand supply tank connected sequentially from top to bottom. A check valve assembly is provided on the outer wall of the connecting hose. The check valve assembly includes a shell, an expansion diaphragm, and a solenoid valve. The shell is located on the outer wall of the connecting hose, and the expansion diaphragm is located on the inner wall of the shell, forming an expansion cavity. The solenoid valve penetrates the shell and is connected to the expansion cavity. When the solenoid valve is energized, high-pressure gas can be introduced into the expansion cavity. When the solenoid valve is de-energized, the gas in the expansion cavity is discharged, and the gas pressure in the expansion cavity is greater than the gas pressure in the sand supply tank. The sand tank has an air blowing valve at one end near the sand storage tank, and a sand outlet at the other end away from the sand storage tank. The continuous quantitative sand supply module includes a sand blasting component and a sand supply hopper connected to the sand blasting component. The sand supply hopper has a sand inlet at the end away from the sand blasting component, and a sand supply pipe is connected between the sand outlet and the sand inlet. The sand supply tank has a first exhaust valve, and the sand supply hopper has a second exhaust valve. The sand blasting component includes a sand supply roller and a drive component. The sand supply roller is connected to the output end of the drive component. The outer wall of the sand supply roller is evenly provided with toothed grooves. The control module is electrically connected to the drive component. The solenoid valve and the air blowing valve open simultaneously, while the air blowing valve and the first exhaust valve open intermittently, and the first exhaust valve and the second exhaust valve open intermittently.

[0007] The beneficial effects of this solution are as follows: The sand storage tank is used to store abrasive fines, and the sand storage tank and the sand supply tank are isolated by a check valve component, allowing the sand storage tank to be kept under normal pressure. Workers can add material to the sand storage tank at any time without requiring additional treatment. The connecting hose connects the sand storage tank and the sand supply tank. The check valve component controls the flow of abrasive fines from the sand storage tank into the sand supply tank through the connecting hose, while preventing the abrasive fines from flowing back into the sand storage tank through the connecting hose when gas is introduced into the sand supply tank via the air purging valve. Specifically, through... When the electric valve is energized, compressed gas is introduced into the expansion chamber, causing the expansion diaphragm to expand until it compresses the outer wall of the connecting hose. This causes the connecting hose to deform and contract, ultimately sealing it and preventing communication between the sand storage tank and the sand supply tank. Simultaneously, because the expansion diaphragm and the connecting hose form a soft-contact seal, it avoids the friction between the ball valve and the abrasive fine sand that can cause traditional valves to malfunction when closed. During the energization of the solenoid valve, the air blowing valve opens, the first exhaust valve closes, and the second exhaust valve opens. The system starts, allowing compressed gas to be introduced into the abrasive supply tank via the air valve. The compressed gas fluidizes the abrasive fines in the tank and drives them through the outlet via a pressure difference. The supply pipe connects the inlet and outlet, and the supply hopper receives and temporarily stores the abrasive fines from the supply pipe. A first exhaust valve maintains pressure balance inside the supply tank during the supply process, and a second exhaust valve maintains pressure balance inside the supply hopper. The blasting assembly outputs the abrasive fines to cut the workpiece. Simultaneously, through… The uniformly spaced grooves on the outer wall of the sand supply roller form independent sand storage units of equal volume. When the drive unit drives the sand supply roller to rotate, the sand supply roller can output a certain amount of abrasive fine sand for each rotation. By controlling the number of rotations of the sand supply roller driven by the drive unit, the output amount of abrasive fine sand can be precisely controlled. Through the dual-chamber design of the sand storage box and the sand supply tank, the sand storage box can be continuously fed. Combined with the cooperation of the anti-reverse component and the air blowing valve, the abrasive fine sand can be transported over long distances without interruption under the dual drive of gravity and air pressure difference.

[0008] Preferably, as an improvement, it also includes a control module. A first proximity switch is provided on the inner wall of the sand storage tank, an alarm is provided on the outer wall of the sand storage tank, and an installation block is provided inside the sand supply tank. A second proximity switch is provided at the end of the installation block near the upper wall of the sand supply tank, and a third proximity switch is provided at the end of the installation block near the bottom of the sand supply tank. The first proximity switch is electrically connected to the alarm through the control module, and the second and third proximity switches are electrically connected to the first exhaust valve, the second exhaust valve, the solenoid valve, and the air blowing valve, respectively, through the control module.

[0009] The beneficial effects are as follows: The first proximity switch is used to detect whether there is abrasive fine sand in the sand storage tank. When the first proximity switch does not detect abrasive fine sand, it sends a signal to the control module, causing the control module to activate the alarm to remind the operator to add material, ensuring the continuous operation of the sand feeding system. The second proximity switch is used to detect the upper limit of abrasive fine sand in the sand supply tank. When the second proximity switch detects abrasive fine sand, it sends a signal to the control module, which controls the solenoid valve to be energized, causing the check valve assembly to tighten the connecting hose, preventing material from entering the sand storage tank. At the same time, the control module controls the first exhaust valve to close, the second exhaust valve to open, and the air blowing valve to open. The system activates, thus supplying compressed gas to the sand supply tank via the air-blowing valve. Because the air pressure in the expansion chamber is greater than that in the sand supply tank, the abrasive fine sand in the sand supply tank can only flow into the sand supply hopper through the sand outlet. When the abrasive fine sand in the sand supply tank reaches the third proximity switch, the third proximity switch sends a signal to the control module, thereby closing the air-blowing valve, opening the first exhaust valve, closing the second exhaust valve, and de-energizing the solenoid valve. The de-energization of the solenoid valve causes the expansion chamber to release compressed gas and contract, thereby connecting the sand storage tank and the sand supply tank, and then resuming the supply of material to the sand supply tank. When the abrasive fine sand in the sand supply tank reaches the second proximity switch, the above process is repeated.

[0010] Preferably, as an improvement, the sandblasting assembly further includes a mounting box and a sandblasting box. The sandblasting box is located at the top of the mounting box and has a sand-containing trough inside. The sand-supply roller is rotated within the sand-containing trough. The drive unit is located inside the mounting box, and the output end of the drive unit passes through the mounting box and the sandblasting box and is connected to the sand-supply roller. The sandblasting box has a sandblasting nozzle. The sand-supply hopper is located at the end of the sandblasting box away from the sandblasting nozzle. The end of the sandblasting box away from the sandblasting nozzle has a through hole that communicates with the sandblasting trough. The end of the sand-supply hopper near the through hole has an inlet, which is located inside the through hole.

[0011] Preferably, as an improvement, the sand-collecting tank is set in the shape of a water droplet, and the sand-blasting nozzle is connected to the tip of the sand-collecting tank.

[0012] The beneficial effect is that when the abrasive roller rotates and releases the abrasive in the tooth groove into the sand container, the abrasive can naturally converge towards the tip along the arc-shaped wall under the action of gravity and the thrust of subsequent materials, and the directional flow of the abrasive can be achieved without the need to set up an additional guide plate.

[0013] Preferably, as an improvement, the solenoid valve is configured as a two-position three-way solenoid valve.

[0014] Preferably, as an improvement, the sandblasting box includes an upper shell and a lower shell, a sand-containing groove is opened at one end of the lower shell, and a groove is opened at the end of the lower shell near the upper shell, and a sealing ring is provided in the groove.

[0015] The beneficial effects are as follows: the sealing ring in the groove of the lower housing can form a sealing strip around the sand-containing groove after the upper housing and the lower housing are fastened together, preventing the abrasive dust generated during the sandblasting process from spreading outward, thus protecting the working environment and avoiding jamming failures caused by dust entering the drive components or transmission components.

[0016] Preferably, as an improvement, the driving component is a servo motor.

[0017] Preferably, as an improvement, it also includes a support frame, with the sand storage box located at the upper end of the support frame and the lower end of the sand storage box configured as a square pyramid. Attached Figure Description

[0018] Figure 1 This is a three-dimensional structural diagram of the remote abrasive supply module according to an embodiment of the present invention; Figure 2 This is a three-dimensional structural diagram of the continuous quantitative sand supply module according to an embodiment of the present invention; Figure 3 This is a partial cross-sectional structural schematic diagram of the sand storage box and support frame according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the internal structure of the sand-supplying container according to an embodiment of the present invention; Figure 5 This is a three-dimensional structural schematic diagram of the sand roller according to an embodiment of the present invention; Figure 6 This is a cross-sectional view of the anti-reverse component according to an embodiment of the present invention. Detailed Implementation

[0019] The following detailed description illustrates the specific implementation method: The reference numerals in the accompanying drawings include: 1. Sand storage tank; 2. Support frame; 3. First proximity switch; 4. Connecting hose; 5. Anti-reverse assembly; 6. Sand supply tank; 7. Mounting block; 8. Mounting groove; 9. Second proximity switch; 10. Third proximity switch; 11. Air blowing valve; 12. Sand outlet; 13. Sand supply hopper; 14. Sand inlet; 15. Sand supply pipe; 16. Sandblasting box; 17. Mounting box; 18. Upper housing; 19. Lower housing; 20. Sand holding trough; 21. Sand supply roller; 22. Toothed groove; 23. Sandblasting nozzle; 24. Second exhaust valve; 25. Sealing ring; 26. Outer shell; 27. Expansion membrane; 28. Expansion chamber; 29. ​​Solenoid valve; 30. First exhaust valve.

[0020] Example The basic implementation examples are as follows: Figures 1-6 As shown, Figure 1 and Figure 2The illustrated remote abrasive continuous feeding and quantitative sand feeding system includes a remote abrasive supply module, a continuous quantitative sand feeding module, and a control module. The control module can be an STM32 microcontroller. A first proximity switch 3 is electrically connected to an alarm via the control module. A second proximity switch 9 and a third proximity switch 10 are respectively electrically connected to a first exhaust valve 30, a second exhaust valve 24, a solenoid valve 29, and an air blowing valve 11 via the control module. Figure 1 The remote abrasive supply module shown includes a sand storage box 1, a connecting hose 4, and a sand supply tank 6 connected sequentially from top to bottom. The lower end of the sand storage box 1 is shaped like a four-sided pyramid, and support frames 2 are fixedly installed at the four corners of the lower end of the sand storage box 1. The support frames 2 are used to raise the height of the sand storage box 1 to facilitate the flow of abrasive fine sand inside the sand storage box 1. Figure 3 A first proximity switch 3 is bolted to the lower inner wall of the sand storage tank 1 shown. The first proximity switch 3 detects the presence of abrasive fines in the sand storage tank 1. When the first proximity switch 3 does not detect abrasive fines, it sends a signal to the control module, causing the control module to activate an alarm to remind the operator to add material, ensuring the continuous operation of the sand feeding system. A check valve component 5 is provided on the outer wall of the connecting hose 4. Figure 6 The check valve assembly 5 shown includes a housing 26, an expansion membrane 27, and a solenoid valve 29. The housing 26 is fixedly installed on the outer wall of the connecting hose 4. The expansion membrane 27 is annularly fixedly installed on the inner wall of the housing 26, forming a sealed expansion cavity 28 with the inner wall of the housing 26. The solenoid valve 29 is fixedly installed on the outer wall of the housing 26 and passes through the housing 26 to communicate with the expansion cavity 28. The solenoid valve 29 is configured as a two-position three-way solenoid valve. When the solenoid valve 29 is energized, it can deliver compressed gas into the expansion cavity 28, causing the expansion membrane 27 to expand and thus tighten the connecting hose 4. When the solenoid valve 29 is de-energized, the compressed gas in the expansion cavity 28 is discharged through the solenoid valve 29, causing the expansion membrane 27 to contract and thus restoring the connection of the connecting hose 4. Since the expansion membrane 27 and the connecting hose 4 are in a soft contact seal, it avoids the friction between the ball valve and the abrasive fine sand when the ball valve is closed, which would cause the ball valve and other traditional valves to fail. This extends the service life of the sand feeding system and reduces the probability of failure of the sand feeding system.

[0021] like Figure 4The sand supply tank 6 shown is fixedly equipped with a first exhaust valve 30 at its upper end. The first exhaust valve 30 is used to maintain the pressure balance inside the sand supply tank 6 during the sand supply process. An installation block 7 is fixedly installed on the upper wall by bolts. The installation block 7 is Z-shaped, with three planes perpendicular to each other. Two parallel planes each have an installation groove 8. A second proximity switch 9 is fixedly installed in the upper installation groove 8 by two nuts, and a third proximity switch 10 is fixedly installed in the lower installation groove 8 by two nuts. Both the second and third proximity switches 9 and 10 have threads on their outer walls that match the nuts. An air blowing valve 11 is fixedly installed at the upper end of the sand supply tank 6. The air blowing valve 11 is used to introduce compressed gas into the sand supply tank 6. After entering the sand supply tank 6, the compressed gas fluidizes the abrasive fine sand. A sand outlet 12 is fixedly installed at the lower end of the sand supply tank 6. Figure 2 The continuous quantitative sand supply module shown includes a sandblasting assembly and a sand supply hopper 13 connected to the sandblasting assembly. A sand inlet 14 is fixedly installed on the upper left side of the sand supply hopper 13, and a second exhaust valve 24 is fixedly installed in the middle of the left side of the sand supply hopper 13. The second exhaust valve 24 is used to maintain the pressure balance inside the sand supply hopper 13 during the sand supply process and prevent air blockage. Figure 1 A sand supply pipe 15 is connected between the sand outlet 12 and the sand inlet 14 shown.

[0022] like Figure 2 The sandblasting assembly shown includes a mounting box 17, a sandblasting chamber 16, and a drive unit. The sandblasting chamber 16 is bolted to the upper end of the mounting box 17. The sandblasting chamber 16 includes an upper housing 18 and a lower housing 19, as shown below. Figure 5 The lower housing 19 shown has a sand-collecting groove 20 at the upper middle part, which is teardrop-shaped. The sand-blasting nozzle 23 is connected to the tip of the sand-collecting groove 20. A sand-feeding roller 21 is rotatably installed inside the sand-collecting groove 20. The outer wall of the sand-feeding roller 21 is evenly provided with toothed grooves 22. The drive component is fixedly installed in the mounting box 17, and the output end of the drive component passes through the mounting box 17 and the lower housing 19 and is fixedly connected to the rotating shaft of the sand-feeding roller 21. The drive component can be a servo motor of model MR-J2S-100A. The front end of the sand-blasting box 16 is fixedly installed with a sand-blasting nozzle 23 that is connected to the sand-collecting groove 20. The sand-feeding hopper 1 3. The lower housing 19 is fixedly installed at the rear end of the sandblasting box 16 by bolts. The rear end of the lower housing 19 has a through hole that communicates with the sandblasting groove. The front end of the sand hopper 13 has an inlet fixedly installed in the through hole. The inlet is located in the through hole. The upper end of the lower housing 19 has a groove that surrounds the outer wall of the sand-containing groove 20. A sealing ring 25 is provided in the groove. The sealing ring 25 in the groove of the lower housing 19 can form a sealing strip around the sand-containing groove 20 after the upper housing 18 and the lower housing 19 are fastened together. This prevents the abrasive dust generated during the sandblasting process from spreading outward, thus protecting the working environment and avoiding the jamming failure caused by dust entering the drive components or transmission components.

[0023] The specific implementation process is as follows: During the sand feeding process, when the first proximity switch 3 fails to detect abrasive fines, it sends a signal to the control module, causing the control module to activate an alarm to remind the operator to add more material, ensuring the continuous operation of the sand feeding system. When the third proximity switch 10 in the sand supply tank 6 fails to detect abrasive fines, it sends a signal to the control module, causing the control module to de-energize the solenoid valve 29 and close the air blowing valve 11, while simultaneously opening the first exhaust valve 30 and closing the second exhaust valve 24. Opening the first exhaust valve 30 restores normal pressure to the sand supply tank 6, thus allowing the check valve assembly 5 to release. When the connecting hose 4 is connected, the sand storage tank 1 is connected to the sand supply tank 6. The abrasive fine sand flows into the sand supply tank 6 by gravity. When the abrasive fine sand reaches the second proximity switch 9, the second proximity switch 9 transmits a signal to the control module. The control module energizes the solenoid valve 29, thereby inputting compressed gas into the expansion chamber 28, causing the expansion membrane 27 to expand until the expansion membrane 27 squeezes the outer wall of the connecting hose 4, causing the connecting hose 4 to deform and contract, ultimately sealing the connecting hose 4 and preventing the sand storage tank 1 and the sand supply tank 6 from connecting. At the same time, the control module closes the first exhaust valve 30 and opens the blowing valve 11 and the second exhaust valve 28. Second exhaust valve 24. At this time, the air blowing valve 11 introduces compressed gas into the sand supply tank 6. When the compressed gas enters the sand supply tank 6, it fluidizes the abrasive fine sand and drives it through the sand outlet 12 and the sand supply pipe 15 to flow into the sand supply hopper 13 via the air pressure difference. This continues until the third proximity switch 10 can no longer detect the abrasive fine sand in the sand supply tank 6. The third proximity switch 10 then sends a signal to the control module, which controls the air blowing valve 11 to close, preventing empty air from entering the sand supply tank 6 and completely eliminating the risk of pipe blockage. At the same time, the control module de-energizes the solenoid valve 29, opens the first exhaust valve 30, and closes the second exhaust valve 24. The second exhaust valve 24 repeats the above process to replenish abrasive fine sand to the sand supply tank 6. During the feeding process of the sand supply hopper 13, when the level of abrasive fine sand in the sand supply hopper 13 overflows the sand inlet 14, it forms a seal by the accumulation of abrasive fine sand itself, thereby automatically blocking the sand supply tank 6 from supplying sand to the sand supply hopper 13. The toothed grooves 22 evenly opened on the outer wall of the sand supply roller 21 form independent sand storage units of equal volume, so that the amount of abrasive fine sand discharged by the sand supply roller 21 in one rotation is consistent. By setting the number of rotations of the sand supply roller 21 in the sand storage tank 20 driven by the drive component in the control module, the output amount of abrasive fine sand can be precisely controlled.

[0024] The sand storage box 1 is used to store abrasive fine sand. The sand storage box 1 is isolated from the sand supply tank 6 by the check valve component 5, so that the sand storage box 1 can be kept under normal pressure. The staff can add material to the sand storage box 1 at any time without the need for additional treatment of the sand storage box 1. With the cooperation of the check valve component 5 and the air blowing valve 11, the abrasive fine sand can be transported over a long distance without interruption under the dual drive of gravity and air pressure difference. Finally, the control module controls the number of rotations of the drive component to drive the sand supply roller 21, and precisely controls the output of abrasive fine sand, thereby realizing the continuous sand supply, long-distance transportation and precise output of a quantitative amount of abrasive fine sand of the sand feeding system.

[0025] The above descriptions are merely embodiments of the present invention, and common knowledge such as specific technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solutions of the present invention, and these should also be considered within the scope of protection of the present invention. These modifications and improvements will not affect the effectiveness of the implementation of the present invention or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.

Claims

1. A remote continuous abrasive feeding and metering system, characterized in that: The system includes a remote abrasive supply module and a continuous quantitative sand supply module. The remote abrasive supply module comprises, from top to bottom, a sand storage tank, a connecting hose, and a sand supply tank. The connecting hose has a check valve assembly on its outer wall, which includes a housing, an expansion diaphragm, and a solenoid valve. The housing is located on the outer wall of the connecting hose, and the expansion diaphragm is located on the inner wall of the housing, forming an expansion chamber. The solenoid valve passes through the housing and is connected to the expansion chamber. When the solenoid valve is energized, high-pressure gas is introduced into the expansion chamber; when the solenoid valve is de-energized, the gas in the expansion chamber is discharged, and the gas pressure in the expansion chamber is greater than the gas pressure in the sand supply tank. The sand supply tank has a blow-off valve at the end near the sand storage tank. The end of the tank away from the sand storage box is provided with a sand outlet. The continuous quantitative sand supply module includes a sand blasting component and a sand supply hopper connected to the sand blasting component. The end of the sand supply hopper away from the sand blasting component is provided with a sand inlet. A sand supply pipe is connected between the sand outlet and the sand inlet. The sand supply tank is provided with a first exhaust valve, and the sand supply hopper is provided with a second exhaust valve. The sand blasting component includes a sand supply roller and a drive component. The sand supply roller is connected to the output end of the drive component. The outer wall of the sand supply roller is uniformly provided with toothed grooves. The control module is electrically connected to the drive component. The solenoid valve and the air blowing valve are opened simultaneously. The air blowing valve and the first exhaust valve are opened intermittently. The first exhaust valve and the second exhaust valve are opened intermittently.

2. The remote continuous abrasive feeding and quantitative sand feeding system according to claim 1, characterized in that: It also includes a control module, a first proximity switch on the inner wall of the sand storage tank, an alarm on the outer wall of the sand storage tank, an installation block inside the sand supply tank, a second proximity switch on the end of the installation block near the upper wall of the sand supply tank, and a third proximity switch on the end of the installation block near the bottom of the sand supply tank. The first proximity switch is electrically connected to the alarm through the control module, and the second and third proximity switches are electrically connected to the first exhaust valve, the second exhaust valve, the solenoid valve, and the air blowing valve through the control module, respectively.

3. The remote continuous abrasive feeding and quantitative sand feeding system according to claim 2, characterized in that: The sandblasting assembly also includes a mounting box and a sandblasting box. The sandblasting box is located at the top of the mounting box and has a sand-containing trough inside. The sand-supply roller rotates within the sand-containing trough. The drive unit is located inside the mounting box, and its output end passes through the mounting box and the sandblasting box and is connected to the sand-supply roller. The sandblasting box has a sandblasting nozzle. The sand-supply hopper is located at the end of the sandblasting box away from the sandblasting nozzle. The end of the sandblasting box away from the sandblasting nozzle has a through hole that communicates with the sandblasting trough. The end of the sand-supply hopper near the through hole has an inlet, which is located inside the through hole.

4. The remote continuous abrasive feeding and quantitative sand feeding system according to claim 3, characterized in that: The sand-collecting tank is designed in the shape of a water droplet, and the sand-blasting nozzle is connected to the tip of the sand-collecting tank.

5. A remote abrasive continuous feeding and quantitative sand feeding system according to claim 4, characterized in that: The solenoid valve is configured as a two-position three-way solenoid valve.

6. The remote continuous abrasive feeding and quantitative sand feeding system according to claim 5, characterized in that: The sandblasting box includes an upper shell and a lower shell. A sand-containing trough is opened at one end of the lower shell, and a groove is opened at the end of the lower shell near the upper shell. A sealing ring is installed in the groove.

7. A remote continuous abrasive feeding and metering system according to claim 6, characterized in that: The driving component is set as a servo motor.

8. A remote continuous abrasive feeding and quantitative sand feeding system according to claim 1, characterized in that: It also includes a support frame, with the sand storage box located at the upper end of the support frame and the lower end of the sand storage box set as a four-sided pyramid.

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