A mixing and conveying device for sponge abrasives

Abstract

This invention relates to the technical field of conveying equipment, and in particular to a mixing and conveying device for sponge abrasive; it can improve the uniformity of sponge abrasive particle distribution in a storage tank, effectively ensuring the sandblasting quality of the workpiece surface; it includes a storage tank, a screw conveyor installed at the bottom of the storage tank, and an air jet pipe, the feed end of the screw conveyor being connected to the bottom of the storage tank, and the discharge end of the screw conveyor being connected to the inside of the air jet pipe; it also includes a lifting and agitating mixing mechanism installed in the storage tank, the lifting and agitating mixing mechanism including a frame fixedly installed in the storage tank, a stirring shaft rotatably installed on the frame, a driver that provides power for the rotation of the stirring shaft, a flexible agitator fixedly installed on the stirring shaft, a retaining ring, and a lifting drive mechanism that drives the retaining ring to move up and down, the flexible agitator including a crossbeam fixedly connected to the upper part of the stirring shaft and multiple flexible agitators, one end of the multiple flexible agitators being connected to a part of the crossbeam away from the stirring shaft.

Description

Technical Field

[0001] This invention relates to the technical field of conveying equipment, and in particular to a mixing and conveying device for sponge abrasives. Background Technology

[0002] The sponge abrasive sandblasting machine is a new type of environmentally friendly surface treatment equipment that uses special sponge abrasive as the blasting medium and compressed air as the power source. It utilizes the combined adsorption and cutting capabilities of sponge abrasive, effectively solving problems such as environmental pollution, health hazards, and low abrasive utilization rate in traditional processes.

[0003] The sponge abrasive is transported to the spray gun through a storage tank and a screw conveyor. An external compressed air source provides kinetic energy to the sponge abrasive in the spray gun. Under the action of the pressurized airflow, the sponge abrasive is sprayed onto the surface of the workpiece to achieve surface treatment of the workpiece.

[0004] However, the particle size of the sponge abrasive varies. Under traditional stirring in the storage tank, small sponge abrasive particles tend to accumulate at the bottom of the tank, while large sponge abrasive particles are located at the top. The uniformity of the distribution of sponge abrasive in the storage and conveying system directly affects the uniformity of the material sprayed at the spray gun. Since the high-pressure air supply pressure of the spray gun is constant, the uneven distribution of sponge abrasive particles causes differences in the grinding of the workpiece surface, which in turn affects the sandblasting quality of the workpiece surface. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a sponge abrasive mixing and conveying device that improves the uniformity of sponge abrasive particle distribution within a storage tank and effectively ensures the sandblasting quality of workpiece surfaces.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a mixing and conveying device for sponge abrasive, comprising a storage tank, a screw conveyor installed at the bottom of the storage tank, and an air jet pipe, wherein the feed end of the screw conveyor is connected to the bottom of the storage tank, and the discharge end of the screw conveyor is connected to the interior of the air jet pipe; further comprising a lifting and agitating mechanism installed inside the storage tank, wherein the lifting and agitating mechanism comprises a frame fixedly installed inside the storage tank, a stirring shaft rotatably installed on the frame, a driver that provides power for the rotation of the stirring shaft, a flexible agitator fixedly installed on the stirring shaft, a retaining ring, and a lifting drive mechanism that drives the retaining ring to move up and down, wherein the flexible agitator comprises a crossbeam fixedly connected to the upper part of the stirring shaft and multiple flexible agitators, one end of each flexible agitator being connected to a part of the crossbeam away from the stirring shaft, and the other end of each flexible agitator being connected to the lower outer wall of the stirring shaft, and all the flexible agitators passing through the retaining ring.

[0007] Furthermore, the input end of the jet pipe is connected to an external air compressor or other pressurized airflow system, and the output end of the jet pipe is equipped with a spray gun; the driver is preferably a pneumatic motor, but other equivalent components that drive the stirring shaft to rotate can also be used; the cross frame is preferably a cross, but other equivalent components such as a star-shaped frame can also be used; multiple flexible stirring elements are evenly distributed around the stirring shaft, and each flexible stirring element has a redundancy; under the centrifugal force during the rotation of the stirring shaft, the middle parts of the multiple flexible stirring elements move away from the center of the stirring shaft and approach the inner wall of the storage tank, and the clamping ring... The ring diameter is 1 / 5 to 1 / 3 of the maximum inner diameter of the storage tank; the lifting drive mechanism can be a telescopic cylinder, etc.; the jet pipe is equipped with necessary valves such as a switch valve, pressure regulating valve, and pressure gauge to adjust the pressure and flow rate of the pressurized airflow in the jet pipe; the centrifugal force borne by the flexible stirring component during the rotation of the stirring shaft driven by the driver should be greater than the weight of the flexible stirring component itself and the resistance of the sponge abrasive to the flexible stirring component. This can be achieved by increasing the horsepower and speed of the driver to keep the flexible stirring component in a relaxed state; during the stirring operation, the speed of the stirring shaft should not be less than 60 rpm.

[0008] Preferably, the lifting drive mechanism includes an air intake vertical pipe fixedly installed in the upper middle part of the storage tank, a connecting pipe, a sleeve slidably installed on the air intake vertical pipe and fitting with the outer wall of the air intake vertical pipe, multiple connecting brackets, and a counterweight cap installed on the top of the air intake vertical pipe. One end of the multiple connecting brackets is connected to the outer wall of the clamping ring, and the other end of the multiple connecting brackets is connected to the air intake vertical pipe. The air intake vertical pipe and the jet pipe are connected through the connecting pipe. A three-way switching valve is installed on the connecting pipe.

[0009] Furthermore, the intake riser and the sleeve are connected by a sliding seal using lubricating oil and packing, with NLGI Grade 2 grease (containing molybdenum disulfide) being preferred to ensure good lubrication and sealing performance of the intake riser and the sleeve in a dusty environment. Multiple connecting brackets are evenly distributed circumferentially around the central axis of the storage tank, and multiple connecting brackets fit into the inner wall of the storage tank. The three-way switching valve is preferably a commercially available T-type three-way switching valve. During the upward movement of the sleeve along the intake riser, the three-way switching valve connects the intake riser and the jet pipe, and the exhaust end of the three-way switching valve is blocked. When the sleeve needs to move downward along the intake riser, the intake riser connects to the exhaust end of the three-way switching valve, and the three-way switching valve blocks the connection between the jet pipe and the intake riser.

[0010] The counterweight cap is preferably made of solid cast iron, but other equivalent parts with a certain counterweight effect can also be used; more specifically, the outer wall of the air intake vertical pipe is provided with multiple slide rails parallel to the axis of the air intake vertical pipe, and the inner wall of the sleeve is provided with a slide groove that fits with the slide rails. The sleeve slides up and down along the axis of the air intake vertical pipe to prevent the sleeve from rotating around the circumference of the air intake vertical pipe.

[0011] Preferably, it also includes an air guide tube, a hollow ring is provided inside the bundle ring, an air jet hole communicating with the hollow ring is provided at the top of the bundle ring, a hollow air intake channel communicating with the hollow ring is provided inside the connecting frame, one end of the air guide tube is communicating with the hollow air intake channel, the other end of the air guide tube passes through the counterweight cap and extends from the top of the counterweight cap into the upper part of the sleeve, and an opening and closing valve is installed on the air guide tube.

[0012] Furthermore, the opening and closing valve is a priority solenoid valve, the top of the counterweight cap is equipped with a conical guide shroud, the solenoid valve is located inside the conical guide shroud, the outer wall of the conical guide shroud is smoothly connected to the outer wall of the counterweight cap, and the conical guide shroud and the outer wall of the counterweight cap form a cone with the tip pointing upwards.

[0013] Preferably, the counterweight cap is in the shape of a cone, the top of the storage tank is provided with a concave hopper, and the concave hopper is provided with a feed inlet that fits with the counterweight cap; it also includes a pressurization pipe communicating with the upper part of the storage tank; a sealing ring is embedded at the bottom of the feed inlet; furthermore, the sealing ring is preferably a plastic rubber ring.

[0014] Preferably, it further includes an open manifold fixedly installed on the sleeve and located below the counterweight cap, an air distribution ring pipe fixedly installed on the outer wall of the open manifold, a plurality of air distribution pipes communicating with the interior of the air distribution ring pipe, and a flexible connecting pipe. The air distribution ring pipe is connected to a pressurized pipeline through the flexible connecting pipe, and an air distribution nozzle is installed on the air distribution pipe facing the space between the counterweight cap and the open manifold.

[0015] The pressurized pipeline is equipped with necessary valves such as switching valves, pressure regulating valves, and pressure gauges; the jet direction of the jet nozzle is perpendicular to the corresponding inclined slope line of the counterweight cap; and the flexible connecting pipe has a redundancy allowance to allow the air distribution ring pipe to move up and down.

[0016] Preferably, it also includes a discharge pipe installed on the storage tank, the input end of which extends into the bottom of the open manifold, and the inner bottom wall of the open manifold is inclined downward toward the discharge pipe; further, a necessary discharge valve is installed on the discharge pipe, and the discharge pipe includes a rigid pipe section fixedly connected to the storage tank and a flexible pipe section connected to the open manifold, the flexible pipe section having a redundancy that allows the open manifold to move up and down.

[0017] Preferably, the flexible stirring component is a stainless steel metal hose; furthermore, the flexible stirring component may also be other flexible components with a certain self-weight, such as metal chains or steel wire ropes.

[0018] Preferably, the bottom of the stirring shaft is provided with a stirring plate that extends into the discharge port at the bottom of the storage tank.

[0019] Preferably, a filter element is installed at the jet hole to prevent sponge abrasive from entering the bundle ring; further, the filter element is preferably a filter screen, the pore size of which is smaller than the minimum particle size of the sponge abrasive, so as to prevent the sponge abrasive from entering the bundle ring.

[0020] Compared with the prior art, the present invention provides a mixing and conveying device for sponge abrasive, which has the following beneficial effects: This mixing and conveying device for sponge abrasive involves placing the sponge abrasive into a storage tank. A driver rotates the stirring shaft and a flexible stirring element. Under centrifugal force, the center of the flexible stirring element moves away from the center of the stirring shaft and gradually enters a state of tension and relaxation. The flexible stirring element agitates the sponge abrasive in the storage tank. Simultaneously, a lifting drive mechanism moves the retaining ring downwards. During the up-and-down movement of the retaining ring, it agitates the sponge abrasive in the storage tank. During the up-and-down movement of the retaining ring, the contact point between the flexible stirring element and the retaining ring gradually moves towards the stirring shaft, while the non-contact point continues to move away from the stirring shaft. This causes the center of the flexible stirring element to repeatedly approach and move away from the stirring shaft, while the sponge abrasive in the storage tank moves back and forth from the inside to the outside and from the outside to the inside. The sponge abrasive is thoroughly mixed, and the sponge abrasive particles are evenly distributed under the mixing of the lifting and agitating mechanism, improving the uniformity of the sponge abrasive particle distribution in the storage tank and effectively ensuring the sandblasting quality of the workpiece surface. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention.

[0022] Figure 2 This is a schematic diagram of the rear view plane structure of the present invention.

[0023] Figure 3 This is a top-view planar structural diagram of the present invention.

[0024] Figure 4 This is the invention Figure 3 Schematic diagram of the cross-sectional structure at point AA.

[0025] Figure 5 This is the invention Figure 4 Schematic diagram of the cross-sectional structure at point BB.

[0026] Figure 6 This is a three-dimensional schematic diagram of the internal structure of the present invention in the form of a tankless storage container.

[0027] Figure 7 This is the invention Figure 4 A magnified schematic diagram of the structure at point C.

[0028] Figure 8 This is the invention Figure 6 A magnified schematic diagram of the structure at point D in the middle.

[0029] Figure 9 This is the invention Figure 6 A magnified schematic diagram of the structure at point E in the middle.

[0030] The following components are labeled in the attached diagram: 1. Storage tank; 2. Screw conveyor; 3. Jet pipe; 4. Frame; 5. Agitator shaft; 6. Driver; 7. Binding ring; 8. Horizontal frame; 9. Flexible agitator; 10. Air inlet vertical pipe; 11. Connecting pipe; 12. Sleeve; 13. Connecting frame; 14. Counterweight cap; 15. Three-way switching valve; 16. Air guide pipe; 17. Hollow ring channel; 18. Jet nozzle; 19. On / off valve; 20. Concave hopper; 21. Feed inlet; 22. Pressurized pipe; 23. Sealing ring; 24. Open header; 25. Air distribution ring pipe; 26. Air distribution pipe; 27. Flexible connecting pipe; 28. Jet nozzle; 29. ​​Discharge pipe; 30. Agitator plate; 31. Filter element. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. 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 should fall within the scope of protection of the present invention.

[0032] It should be noted that, unless otherwise specified, the embodiments and features and technical solutions in the embodiments of the present invention can be combined with each other.

[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0034] Example 1

[0035] Please refer to Figures 1-6A mixing and conveying device for sponge abrasive includes a storage tank 1, a screw conveyor 2 installed at the bottom of the storage tank 1, and an air jet pipe 3. The feed end of the screw conveyor 2 is connected to the bottom of the storage tank 1, and the discharge end of the screw conveyor 2 is connected to the inside of the air jet pipe 3. It also includes a lifting and agitating mechanism installed in the storage tank 1. The lifting and agitating mechanism includes a frame 4 fixedly installed in the storage tank 1, a stirring shaft 5 rotatably installed on the frame 4, a driver 6 that provides power for the rotation of the stirring shaft 5, a flexible agitator fixedly installed on the stirring shaft 5, a retaining ring 7, and a lifting drive mechanism that drives the retaining ring 7 to move up and down. The flexible agitator includes a crossbeam 8 fixedly connected to the upper part of the stirring shaft 5 and a plurality of flexible agitators 9. One end of the plurality of flexible agitators 9 is connected to a part of the crossbeam 8 away from the stirring shaft 5, and the other end of the plurality of flexible agitators 9 is connected to the lower outer wall of the stirring shaft 5. The plurality of flexible agitators 9 all pass through the retaining ring 7.

[0036] The inlet of the jet pipe 3 is connected to an external air compressor or other pressurized airflow system, and the outlet of the jet pipe 3 is equipped with a spray gun; the driver 6 is preferably a pneumatic motor, but other equivalent components that drive the stirring shaft 5 to rotate can also be used; the cross frame 8 is preferably a cross, but other equivalent components such as a star-shaped frame can also be used; multiple flexible stirring elements 9 are evenly distributed around the stirring shaft 5, and each flexible stirring element 9 has a redundancy; under the centrifugal force during the rotation of the stirring shaft 5, the middle of each flexible stirring element 9 moves away from the center of the stirring shaft 5 and approaches the inner wall of the storage tank 1, and the ring diameter of the clamping ring 7 is the storage... The storage tank 1 has a maximum inner diameter of 1 / 5 to 1 / 3; the lifting drive mechanism can be a telescopic cylinder, etc.; the jet pipe 3 is equipped with necessary valves such as a switch valve, pressure regulating valve, and pressure gauge to adjust the pressure and flow rate of the pressurized airflow in the jet pipe 3; during the rotation of the stirring shaft 5 driven by the driver 6, the centrifugal force borne by the flexible stirring element 9 should be greater than the weight of the flexible stirring element 9 itself and the resistance of the sponge abrasive to the flexible stirring element 9. This can be achieved by increasing the horsepower and speed of the driver 6 to keep the flexible stirring element 9 in a relaxed state; during the stirring operation, the speed of the stirring shaft 5 shall not be less than 60 rpm.

[0037] Specifically, the flexible mixing component 9 is made of stainless steel metal hose; furthermore, the flexible mixing component 9 can also be made of other flexible components with a certain self-weight, such as metal chain or steel wire rope.

[0038] Please refer to Figure 6 as well as Figure 9 The bottom of the stirring shaft 5 is equipped with a stirring plate 30 that extends into the bottom outlet of the storage tank 1.

[0039] The core of a sponge abrasive sandblasting machine is the sponge abrasive itself, which possesses low dust and low ejection properties. Combined with the absorption capacity of polyurethane sponge and the cleaning and grinding capabilities of traditional sandblasting, the sponge abrasive's flexibility causes it to flatten upon impact with the workpiece surface. The rigid abrasive encased within then strikes the workpiece surface for surface treatment, before instantly expanding to three times its actual size and creating a vacuum. This vacuum traps most of the airborne particles and debris that detach from the surface after impact, exposing the substrate without causing environmental pollution. Furthermore, the sponge abrasive, being composed of porous polyurethane sponge with a density of 150 g / m³, is highly effective. 3 -250g / m 3 Compared to traditional metal and abrasive materials, this material has a lower density and less interparticle frictional resistance, thus it will not cause excessive resistance to the flexible mixing element 9. However, this mixing and conveying device is not suitable for other abrasive materials with high density and high interparticle friction. In another embodiment, this mixing and conveying device can also be applied to the mixing and conveying of liquid materials. This case uses the mixing and conveying of sponge abrasive as an example for description, but it should not be understood as a limitation on the scope of application of this case.

[0040] When the screw conveyor 2 needs to feed material into the jet pipe 3, the driver 6 drives the stirring shaft 5 to rotate, and the stirring shaft 5 drives the stirring plate 30 to rotate, so that the sponge abrasive can enter the screw conveyor 2 more smoothly, avoiding the sponge material from accumulating at the feed inlet 21 of the screw conveyor 2 and causing blockage.

[0041] Example 2

[0042] The mixing and conveying device for sponge abrasive provided in Example 1 has been further optimized. For details, please refer to [link / reference needed]. Figures 3-6 The lifting drive mechanism includes an air intake vertical pipe 10 fixedly installed in the upper middle part of the storage tank 1, a connecting pipe 11, a sleeve 12 that is slidably installed on the air intake vertical pipe 10 and fits the outer wall of the air intake vertical pipe 10, multiple connecting brackets 13, and a counterweight cap 14 installed on the top of the air intake vertical pipe 10. One end of the multiple connecting brackets 13 is connected to the outer wall of the clamping ring 7, and the other end of the multiple connecting brackets 13 is connected to the air intake vertical pipe 10. The air intake vertical pipe 10 and the jet pipe 3 are connected through the connecting pipe 11. A three-way switching valve 15 is installed on the connecting pipe 11.

[0043] The intake riser 10 and the sleeve 12 are connected by a sliding seal using lubricating oil and packing. The lubricating oil is preferably NLGI Grade 2 grease containing molybdenum disulfide to ensure good lubrication and sealing performance of the intake riser 10 and the sleeve 12 in a dusty environment. Multiple connecting brackets 13 are evenly distributed around the central axis of the storage tank 1, and the multiple connecting brackets 13 fit into the inner wall of the storage tank 1. The three-way switching valve 15 is preferably a commercially available T-type three-way switching valve 15. The structure and principle of the three-way switching valve 15 will not be further described here. During the upward movement of the sleeve 12 along the intake riser 10, the three-way switching valve 15 connects the intake riser 10 and the jet pipe 3, and the exhaust end of the three-way switching valve 15 is blocked.

[0044] When the sleeve 12 needs to move down along the intake vertical pipe 10, the intake vertical pipe 10 is connected to the exhaust end of the three-way switching valve 15, and the three-way switching valve 15 blocks the connection between the jet pipe 3 and the intake vertical pipe 10; the counterweight cap 14 is preferably made of solid cast iron, but other equivalent parts with a certain counterweight effect can also be used. The self-weight of the lifting and agitating stirring mechanism should be greater than the resistance of the sponge abrasive to the clamping ring 7 and the connecting frame 13.

[0045] More specifically, the outer wall of the intake riser 10 is provided with multiple slide rails parallel to the axis of the intake riser 10, and the inner wall of the sleeve 12 is provided with a slide groove that fits with the slide rail. The sleeve 12 slides up and down along the axis of the intake riser 10 to prevent the sleeve 12 from rotating around the intake riser 10.

[0046] Please refer to Figures 4-9 It also includes an air guide pipe 16, a hollow ring 17 inside the clamping ring 7, a jet hole 18 at the top of the clamping ring 7 communicating with the hollow ring 17, a hollow air intake channel inside the connecting frame 13 communicating with the hollow ring 17, one end of the air guide pipe 16 communicating with the hollow air intake channel, and the other end of the air guide pipe 16 passing through the counterweight cap 14 and extending from the top of the counterweight cap 14 into the upper part of the sleeve 12. An opening and closing valve 19 is installed on the air guide pipe 16; furthermore, the opening and closing valve 19 is a priority solenoid valve, a conical guide shroud is installed at the top of the counterweight cap 14, the solenoid valve is located inside the conical guide shroud, the outer wall of the conical guide shroud is smoothly connected to the outer wall of the counterweight cap 14, and the conical guide shroud and the outer wall of the counterweight cap 14 form a cone with the tip pointing upwards; a position sensor corresponding to the clamping ring 7 can be installed at the bottom of the storage tank 1 and coupled to the opening and closing valve 19 through an external control system. When the clamping ring 7 contacts the position sensor, the opening and closing valve 19 opens.

[0047] A filter element 31 is installed at the jet hole 18 to prevent sponge abrasive from entering the binding ring 7; further, the filter element 31 is preferably a filter screen with a pore size smaller than the minimum particle size of the sponge abrasive, so as to prevent the sponge abrasive from entering the binding ring 7.

[0048] When the three-way switching valve 15 connects the connecting pipe 11 and the intake vertical pipe 10 and blocks the exhaust end of the three-way switching valve 15, the pressurized airflow in the jet pipe 3 enters the intake vertical pipe 10 through the connecting pipe 11. The air pressure in the intake vertical pipe 10 increases to a level greater than the weight of the lifting and agitating mechanism and the resistance it bears. The sleeve 12 drives the counterweight cap 14 to move upward, and the clamping ring 7 moves upward synchronously after being driven by the connecting frame 13. When the three-way switching valve 15 blocks the connecting pipe 11, so that the connection between the intake vertical pipe 10 and the three-way switching valve 15 is connected, the air pressure in the intake vertical pipe 10 decreases. Under the action of the counterweight cap 14 and the connecting frame 13, the clamping ring 7 moves downward, thus realizing the up and down driving of the clamping ring 7.

[0049] When the clamping ring 7 is at the bottom of the storage tank 1, the on / off valve 19 opens, and the pressurized airflow in the intake vertical pipe 10 enters the hollow ring channel 17 in the clamping ring 7 through the air guide pipe 16 and the hollow air intake channel, and is ejected upward through the jet hole 18. The ejected airflow provides an upward thrust to the sponge abrasive in the storage tank 1, causing the sponge abrasive at the bottom of the storage tank 1 to move upward into the storage tank 1. Under the "buoyancy" of the airflow, the sponge abrasive in the storage tank 1 is in a "floating" state, and the friction between the sponge abrasive is further reduced. This reduces the friction between the flexible stirring element 9 and the sponge abrasive, allowing the sponge abrasive to be stirred and mixed more smoothly, and effectively reduces the aggregation of small sponge abrasive particles to the bottom of the storage tank 1, further ensuring the uniformity of the sponge abrasive particle distribution. Alternatively, by increasing the air pressure entering the intake vertical pipe 10, the air pressure inside the intake vertical pipe 10 can ensure that while the sleeve 12 moves upward, some pressurized airflow enters the binding ring 7 and is ejected through the jet hole 18. That is, during the upward movement of the binding ring 7, airflow is always ejected from the jet hole 18, so as to ensure that the sponge abrasive is in a "suspended" state for a longer time.

[0050] In another embodiment, an air jet mechanism can be installed at the bottom of the storage tank 1 to provide upward force to the sponge abrasive in the storage tank 1. The sponge abrasive is always in a "floating" state when it is being stirred and mixed, so that the lifting and agitating stirring mechanism can mix the sponge abrasive more thoroughly and evenly.

[0051] Example 3

[0052] The mixing and conveying device for sponge abrasive provided in Example 2 has been further optimized. For details, please refer to [link / reference needed]. Figures 4-5 as well as Figure 7 The counterweight cap 14 is in the shape of a cone, and the top of the storage tank 1 is provided with a concave hopper 20, and the concave hopper 20 is provided with a feed inlet 21 that fits with the counterweight cap 14; it also includes a pressurized pipe 22 that communicates with the upper part of the storage tank 1; a sealing ring 23 is embedded in the bottom of the feed inlet 21; furthermore, the sealing ring 23 is preferably a plastic rubber ring.

[0053] The sponge abrasive can be placed into the concave hopper 20, and the sponge filler can be fed into the storage tank 1 through the feed inlet 21. When the sponge abrasive is stirred and needs to be fed into the jet pipe 3 through the screw conveyor 2, the sponge abrasive is difficult to enter the jet pipe 3 smoothly due to the high air pressure in the jet pipe 3. At this time, the three-way switching valve 15 connects the air intake vertical pipe 10 and the jet pipe 3, increasing the air pressure in the air intake vertical pipe 10. The sleeve 12 drives the counterweight cap 14 to move upward, and the counterweight cap 14 makes tight contact with the sealing ring 23 at the feed inlet 21 and seals the storage tank 1. The pressurization pipe 22 is connected to an external air compressor or a pressurized air source, or the jet pipe 3 can be connected to the inside of the storage tank 1 through the pipeline, so that the air pressure in the storage tank 1 increases and the air pressure in the jet pipe 3 is balanced. Under the action of the screw conveyor 2, the sponge abrasive in the storage tank 1 can smoothly enter the jet pipe 3.

[0054] Example 4

[0055] The sponge abrasive mixing and conveying device provided in Example 3 has been further optimized. For details, please refer to [link / reference needed]. Figures 4-8 It also includes an open manifold 24 fixedly installed on the sleeve 12 and located below the counterweight cap 14, an air distribution ring pipe 25 fixedly installed on the outer wall of the open manifold 24, multiple air distribution pipes 26 communicating with the interior of the air distribution ring pipe 25, and a flexible connecting pipe 27. The air distribution ring pipe 25 is connected to the pressurization pipeline 22 through the flexible connecting pipe 27. Air nozzles 28 are installed on the air distribution pipes 26 facing between the counterweight cap 14 and the open manifold 24. Furthermore, necessary valves such as switching valves, pressure regulating valves, and pressure gauges are installed on the pressurization pipeline 22; the air jet direction of the air nozzles 28 is perpendicular to the corresponding inclined slope line of the counterweight cap 14; and the flexible connecting pipe 27 has a redundancy allowance to allow the air distribution ring pipe 25 to move up and down.

[0056] For details, please refer to Figures 5-6 It also includes a discharge pipe 29 installed on the storage tank 1. The input end of the discharge pipe 29 extends into the bottom of the open manifold 24. The inner bottom wall of the open manifold 24 is inclined downward toward the discharge pipe 29. Furthermore, the discharge pipe 29 is equipped with a necessary discharge valve. The discharge pipe 29 includes a rigid pipe section fixedly connected to the storage tank 1 and a flexible pipe section connected to the open manifold 24. The flexible pipe section has a redundancy that allows the open manifold 24 to move up and down.

[0057] When the sponge abrasive is fed into the storage tank 1, an annular gap (0.5-2cm wide) is formed between the counterweight cap 14 and the feed inlet 21. The sponge abrasive in the concave hopper 20 enters through the annular gap and slides down along the outer wall of the counterweight cap 14. During this process, external pressurized airflow enters the jet nozzle 28 through the pressurized pipe 22, flexible connecting pipe 27, air distribution ring pipe 25 and air distribution pipe 26 and is ejected from the jet nozzle 28. The airflow ejected from the jet nozzle 28 blows small particles of lightweight sponge abrasive and some dust particles into the open collection cylinder 24, while large particles of heavy sponge abrasive fall into the storage tank 1. In this way, unqualified small particles of lightweight sponge abrasive and impurities can be removed from the sponge abrasive, effectively improving the purity of the sponge abrasive in the storage tank 1, thereby ensuring the uniformity of the sponge abrasive particles.

[0058] The substandard sponge abrasive and impurities collected in the open collection cylinder 24 can be discharged by opening the discharge valve.

[0059] In addition, the pneumatic components and pressurized airflow in this case are controlled by an external pneumatic control system (such as SMC pneumatic components integrated in a sealed control box); while the electric components in this case, such as electric control valves, are automatically programmed and controlled by an external electric control system (PLC control system or computer control system). The automatic control principles of the pneumatic system and the electric control system will not be further elaborated or limited in this case.

[0060] The process of using the sponge abrasive mixing and conveying device provided by the present invention is as follows: A portion of pressurized airflow is blown into the air inlet vertical pipe 10 through the jet pipe 3 and the connecting pipe 11, causing the sleeve 12 to move the counterweight cap 14 upwards. An annular gap is formed between the counterweight cap 14 and the feed inlet 21. The sponge abrasive is placed into the concave hopper 20. The sponge abrasive enters through the annular gap and slides down along the outer wall of the counterweight cap 14. The airflow ejected from the jet nozzle 28 acts on the dispersed and sliding sponge abrasive, and small, lightweight sponge abrasive particles that do not meet the requirements are blown away. The material is fed into the open collection cylinder 24, while qualified sponge abrasive falls into the storage tank 1. A portion of the pressurized airflow is ejected upwards through the jet holes 18 on the clamping ring 7, causing the sponge filler in the storage tank 1 to be blown upwards. Then, the driver 6 is activated, driving the stirring shaft 5 and the flexible stirring element 9 to rotate. Under centrifugal force, the center of the flexible stirring element 9 moves away from the center of the stirring shaft 5 and gradually enters a state of tension and relaxation. The flexible stirring element 9 agitates the sponge abrasive in the storage tank 1. Simultaneously, the lifting drive mechanism... The clamping ring 7 moves downwards, and during this up-and-down movement, it agitates the sponge abrasive inside the storage tank 1. As the clamping ring 7 moves, the contact area between the flexible stirring element 9 and the clamping ring 7 gradually moves towards the stirring shaft 5, while the non-contact areas of the flexible stirring element 9 continue to move away from the stirring shaft 5. This causes the center of the flexible stirring element 9 to repeatedly approach and move away from the stirring shaft 5, while the sponge abrasive inside the storage tank 1 moves back and forth between the inside and outside, resulting in a uniform mixture. After mixing, pressurize the air intake vertical pipe 10, move the counterweight cap 14 upward and seal the feed inlet 21, and blow pressurized air into the storage tank 1 through the pressurized pipe 22, flexible connecting pipe 27, air distribution ring pipe 25, air distribution pipe 26 and jet nozzle 28, so that the air pressure in the storage tank 1 is balanced with the air pressure in the jet pipe 3. The screw conveyor 2 transports the sponge abrasive at the bottom of the storage tank 1 to the jet pipe 3, and the pressurized air in the jet pipe 3 transports the sponge abrasive to the spray gun, realizing the mixing and transportation of the sponge abrasive.

[0061] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

Claims

1. A mixing and conveying device for sponge abrasive, comprising a storage tank (1), a screw conveyor (2) installed at the bottom of the storage tank (1), and an air jet pipe (3), wherein the feed end of the screw conveyor (2) is connected to the bottom of the storage tank (1), and the discharge end of the screw conveyor (2) is connected to the interior of the air jet pipe (3); characterized in that, It also includes a lifting polymerization agitator installed in the storage tank (1). The lifting polymerization agitator includes a frame (4) fixedly installed in the storage tank (1), a stirring shaft (5) rotatably installed on the frame (4), a driver (6) that provides power for the rotation of the stirring shaft (5), a flexible stirrer fixedly installed on the stirring shaft (5), a retaining ring (7), and a lifting drive mechanism that drives the retaining ring (7) to move up and down. The flexible stirrer includes a cross frame (8) fixedly connected to the upper part of the stirring shaft (5) and multiple flexible stirring elements (9). One end of the multiple flexible stirring elements (9) is connected to the cross frame (8) away from the stirring shaft (5), and the other end of the multiple flexible stirring elements (9) is connected to the lower outer wall of the stirring shaft (5). The multiple flexible stirring elements (9) all pass through the retaining ring (7). The lifting drive mechanism includes an air intake vertical pipe (10) fixedly installed in the upper middle part of the storage tank (1), a connecting pipe (11), a sleeve (12) slidably installed on the air intake vertical pipe (10) and fitted with the outer wall of the air intake vertical pipe (10), multiple connecting brackets (13) and a counterweight cap (14) installed on the top of the air intake vertical pipe (10). One end of the multiple connecting brackets (13) is connected to the outer wall of the clamping ring (7), and the other end of the multiple connecting brackets (13) is connected to the air intake vertical pipe (10). The air intake vertical pipe (10) and the jet pipe (3) are connected through the connecting pipe (11). A three-way switching valve (15) is installed on the connecting pipe (11).

2. The mixing and conveying device for sponge abrasives according to claim 1, characterized in that, It also includes an air guide tube (16), a hollow ring channel (17) is provided inside the bundle ring (7), an air jet hole (18) communicating with the hollow ring channel (17) is provided at the top of the bundle ring (7), a hollow air intake channel communicating with the hollow ring channel (17) is provided inside the connecting frame (13), one end of the air guide tube (16) is connected to the hollow air intake channel, the other end of the air guide tube (16) passes through the counterweight cap (14) and extends from the top of the counterweight cap (14) into the upper part of the sleeve (12), and an opening and closing valve (19) is installed on the air guide tube (16).

3. The mixing and conveying device for sponge abrasives according to claim 1 or 2, characterized in that, The counterweight cap (14) is in the shape of a cone, and the top of the storage tank (1) is provided with a concave hopper (20), and the concave hopper (20) is provided with a feed inlet (21) that fits with the counterweight cap (14); it also includes a pressurized pipe (22) that communicates with the upper part of the storage tank (1); a sealing ring (23) is embedded at the bottom of the feed inlet (21).

4. The mixing and conveying device for sponge abrasives according to claim 3, characterized in that, It also includes an open manifold (24) fixedly installed on the sleeve (12) and located below the counterweight cap (14), an air distribution ring pipe (25) fixedly installed on the outer wall of the open manifold (24), a plurality of air distribution pipes (26) communicating with the interior of the air distribution ring pipe (25) and a flexible connecting pipe (27). The air distribution ring pipe (25) is connected to the pressurization pipe (22) through the flexible connecting pipe (27). The air distribution pipe (26) is equipped with a jet nozzle (28) facing between the counterweight cap (14) and the open manifold (24).

5. The mixing and conveying device for sponge abrasives according to claim 1, characterized in that, It also includes a discharge pipe (29) installed on the storage tank (1), the input end of which extends into the bottom of the open collection cylinder (24), and the inner bottom wall of the open collection cylinder (24) is inclined downward toward the discharge pipe (29).

6. The mixing and conveying device for sponge abrasives according to claim 1, characterized in that, The flexible agitator (9) is made of stainless steel metal hose.

7. The mixing and conveying device for sponge abrasives according to claim 1, characterized in that, The bottom of the stirring shaft (5) is provided with a stirring plate (30) that extends into the bottom outlet of the storage tank (1).

8. The mixing and conveying device for sponge abrasives according to claim 2, characterized in that, A filter element (31) is installed at the jet hole (18) to prevent sponge abrasive from entering the bundle ring (7).

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