Dustproof mechanism of pneumatic grinding machine

Abstract

The invention relates to the technical field of grinding machines, and discloses a pneumatic grinding machine dustproof mechanism which comprises a grinding machine body, an air inlet pipe, a pressing plate, a transmission rod and a grinding wheel, the end, close to the transmission rod, of the grinding machine body is connected with a dismounting assembly, the other end of the dismounting assembly is connected with an air draft assembly, and the output end of the air draft assembly is connected with a filtering assembly; and the other end of the filtering assembly is connected with an air blowing assembly. According to the dustproof mechanism of the pneumatic grinding machine, the dismounting assembly is arranged between the grinding machine body and the grinding wheel, so that when maintenance is needed, parts such as an air draft assembly and the like can be dismounted from the grinding machine body; according to the grinding machine, the air draft assembly is arranged between the grinding machine body and the grinding wheel, and the air draft assembly is connected with the transmission rod, so that a negative pressure area can be formed above a workpiece while the transmission rod drives the grinding wheel to rotate to grind the workpiece, dust generated during grinding of the grinding wheel can be absorbed, and the influence on the environment and workers is reduced.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grinding machines, in particular to a dustproof mechanism of a pneumatic grinding machine. BACKGROUND

[0002] A pneumatic grinding machine is an industrial tool that uses compressed air as a power source. It drives the grinding wheel to rotate through a pneumatic motor, thereby achieving grinding, polishing or cutting of materials.

[0003] The patent with the announcement number CN218254414U discloses a novel pneumatic grinding machine, which comprises a rotating seat, a protective cover is arranged on the outer side of the rotating seat, a protective plate is fixedly connected to the bottom of the protective cover, a cavity is arranged between the rotating seat and the protective cover, a rotating shaft is fixedly connected to the bottom of the rotating seat, a grinding wheel blade is fixedly installed on one end of the rotating shaft, a handle and a knob are fixedly installed on the outer side of the rotating seat, a switch is arranged on the handle, an air inlet is arranged on one end of the handle, and an air adjusting assembly is arranged in the handle. By pulling down the protective cover, the protective cover can cover the grinding wheel blade. By rotating the protective cover, the positioning block on the inner wall of the protective cover moves transversely in the sliding groove, so that the protective cover is fixed. The protective piece is inserted into the clamping groove arranged on the inner wall of the protective plate, and the grinding wheel blade is covered inside the protective cover and the protective piece. The area of the grinding wheel blade exposed to the outside is reduced, thereby reducing the probability of injury to the operator caused by the grinding wheel blade and improving the safety of the grinding machine.

[0004] However, the above-mentioned pneumatic grinding machine still has the following problems in actual use: During use, the pneumatic grinding machine generates a large amount of dust and fine particles. These substances not only pollute the working environment, but also affect the normal operation of the equipment and even threaten the health of the operator. Therefore, effective dustproof measures are necessary.

[0005] At present, the pneumatic grinding machine only increases a dust cover on the outside of the grinding wheel. Although this dust cover can prevent dust from splashing to a certain extent, it cannot collect the dust. As a result, the dust will still overflow from the gap between the dust cover and the grinding wheel to the external environment, which still causes problems such as pollution of the working environment, affecting the operation of the equipment and threatening the health of the operator. SUMMARY

[0006] In view of the deficiencies of the prior art, the present application provides a dustproof mechanism of a pneumatic grinding machine to solve the problem that the existing grinding machine body cannot collect dust when grinding workpieces, which causes the dust to still overflow from the gap between the dust cover and the grinding wheel to the external environment, thereby causing problems such as pollution of the working environment, affecting the operation of the equipment and threatening the health of the operator.

[0007] In order to achieve the above object, the present application provides the following technical scheme: A dustproof mechanism of a pneumatic grinding machine, comprising a grinding machine body, an air inlet pipe installed on one side of the grinding machine body, a pressing plate installed on the air inlet pipe, a transmission rod installed on the lower end of the grinding machine body, and a grinding wheel installed on the transmission rod, one end of the grinding machine body close to the transmission rod is connected with a dismounting assembly, the other end of the dismounting assembly is connected with an air suction assembly, the output end of the air suction assembly is connected with a filtering assembly, the other end of the filtering assembly is connected with a blowing assembly, the input end of the air suction assembly is connected with a dust collection assembly, the blowing assembly is sleeved outside the dust collection assembly, the dismounting assembly, the air suction assembly and the dust collection assembly are all sleeved outside the transmission rod, the grinding wheel is located inside the dust collection assembly, and the lower end of the blowing assembly is flush with the lowest point of the grinding wheel.

[0008] Further, the dismounting assembly comprises an outer threaded ring and an inner threaded ring, the upper end of the outer threaded ring is fixedly connected with one end of the grinding machine body close to the transmission rod, and the lower end of the inner threaded ring is connected with the upper end of the air suction assembly.

[0009] Further, the air suction assembly comprises an air suction pipe, an air outlet pipe, an air suction tube and a rotating assembly, the upper end of the air suction pipe is fixedly connected with the lower end of the inner threaded ring, the lower end of the air suction pipe is fixedly connected with the upper end of the air suction tube, the lower end of the air suction tube is connected with the dust collection assembly, the side wall of the air suction pipe is fixedly connected with one end of the air outlet pipe, the other end of the air outlet pipe is connected with the blowing assembly, and the rotating assembly is located inside the air suction pipe and connected with the transmission rod.

[0010] Further, the rotating assembly comprises an impeller and a plurality of clamping blocks, the upper surfaces of the impeller and the air suction pipe are both provided with a through hole, the inner walls of the through holes are both provided with a plurality of clamping holes, the plurality of clamping blocks are fixedly connected with the outer wall of the transmission rod, the outer walls of the plurality of clamping blocks are respectively connected with the inner walls of the plurality of clamping holes in a sliding mode, the impeller is connected with the transmission rod through the plurality of clamping holes and clamping blocks, and the impeller is located inside the air suction pipe and connected with the upper surface and the bottom surface of the air suction pipe in a sliding mode.

[0011] Further, the filtering assembly comprises a backflow pipe, a sealing plate, a dust collection net and a clamping plate, one side of the air outlet pipe away from the air suction pipe is provided with a clamping opening, the outer wall of the clamping plate is connected with the inner wall of the clamping opening in a sliding mode, one side of the clamping plate away from the clamping opening is fixedly connected with one end of the dust collection net, the upper end of the backflow pipe is fixedly connected with one end of the air outlet pipe away from the air suction pipe, the lower end of the backflow pipe is connected with the blowing assembly, the upper surface of the backflow pipe is provided with a replacement opening in a penetrating mode, the outer wall of the lower end of the sealing plate is connected with the inner wall of the replacement opening in a sliding mode, the upper end of the sealing plate is fastened with the outer walls of the upper surfaces of the backflow pipe and the air outlet pipe through a plurality of bolts, and the lengths of the replacement opening and the sealing plate are not less than the total length of the dust collection net and the clamping plate.

[0012] Furthermore, the air blowing assembly includes a blower hood, an exhaust pipe, a sealing plug, an air filling pipe, a one-way valve, a partition, a compression assembly, and a connecting assembly. The inner wall of the upper end of the blower hood is fixedly connected to the outer wall of the suction pipe. A backflow port extends through one side of the blower hood. The lower end of the return pipe is fixedly connected to the side wall of the blower hood. An air inlet chamber is formed on the inner wall of the blower hood. The upper end of the connecting assembly is located in the air inlet chamber, and the lower end of the connecting assembly extends through the lower end of the blower hood to the outside and connects to the dust collection assembly. The side wall of the partition is connected to the inner wall of the air inlet chamber. The components are fixedly connected, with the backflush port located below the partition. An air exchange chamber is separated above the partition. The upper end of the compression assembly is located inside the air exchange chamber, and the lower end of the compression assembly passes through the partition and is connected to the end of the connecting assembly located inside the air inlet chamber. The lower ends of the exhaust pipe and the gas filling pipe are fixedly connected to the upper end of the blower hood. The lower end of the sealing plug is threaded to the inner wall of the gas filling pipe. The one-way valve is located inside the exhaust pipe. The return pipe, backflush port, air inlet chamber, and connecting assembly are internally connected. The exhaust pipe, gas filling pipe, and air exchange chamber are internally connected.

[0013] Furthermore, the compression assembly includes a sealing ring and several push rods. The side wall of the sealing ring is slidably connected to the inner wall of the air exchange chamber, and the bottom surface of the sealing ring is fixedly connected to the upper ends of several push rods. The lower ends of several push rods all penetrate the partition and are connected to one end of the connecting assembly located in the air inlet chamber.

[0014] Furthermore, the connecting assembly includes a connecting ring, several nozzles, and several movable rods. The upper ends of the movable rods are fixedly connected to one end of several push rods that penetrate the partition. The lower ends of the movable rods are fixedly connected to the upper ends of several nozzles. The lower ends of the nozzles all penetrate the lower end of the blower hood and the connecting ring. The outer walls of the nozzles are fixedly connected to the inner wall of the connecting ring. The side wall of the connecting ring is connected to the air intake assembly. The lowest point of the nozzles is flush with the bottom surface of the grinding wheel. The side walls of the movable rods are all provided with air inlets. The air inlet chamber, the air inlets, and the nozzles are internally connected.

[0015] Furthermore, the dust collection assembly includes an outer suction hood, an inner suction hood, several support blocks, and a telescopic component. The inner wall of the upper end of the outer suction hood is fixedly connected to the outer wall of the lower end of the suction pipe. The middle part of the bottom surface of the outer suction hood is fixedly connected to the upper end of several support blocks. The lower ends of several support blocks are all fixedly connected to the middle part of the outer wall of the inner suction hood. A suction chamber is separated between the outer suction hood and the inner suction hood by several support blocks. The upper end of the telescopic component is located inside the suction chamber. The lower end of the telescopic component passes through the lower ends of the outer suction hood and the inner suction hood and is connected to the inner side wall of the connecting ring. The transmission rod passes through the middle of the outer suction hood and the inner suction hood. The grinding wheel is located inside the inner suction hood. The suction pipe, the outer suction hood, the inner suction hood, and the telescopic component are internally connected.

[0016] Furthermore, the telescopic assembly includes a lifting cover and two anti-detachment rings. The two anti-detachment rings are fixedly connected to the two side walls of the upper end of the lifting cover, respectively. The outer walls of the lifting cover and the two anti-detachment rings are slidably connected to the inner wall of the suction chamber. The lower end of the lifting cover passes through the lower ends of the outer suction cover and the inner suction cover, and the end of the lifting cover that passes through the suction chamber is fixedly connected to the inner side wall of the connecting ring. Several dust suction holes are opened through the bottom surface and the inner side of the lower end of the lifting cover.

[0017] Compared with the prior art, the present invention has the following beneficial effects: This type of dustproof mechanism for pneumatic grinding machines allows for the removal of components such as the exhaust system from the grinding machine body when maintenance is required, by setting a disassembly assembly between the grinding machine body and the grinding wheel.

[0018] This type of dust prevention mechanism for pneumatic grinding machines uses a ventilation assembly installed between the grinding machine body and the grinding wheel, and connects the ventilation assembly to the transmission rod. While the transmission rod drives the grinding wheel to rotate and grind the workpiece, it can also create a negative pressure zone above the workpiece, thereby absorbing the dust generated during grinding and reducing the impact on the environment and workers.

[0019] This type of dust prevention mechanism for pneumatic grinding machines filters the dust drawn in by the exhaust assembly by installing a filter component at the output end of the exhaust assembly, preventing the dust from returning to the external environment.

[0020] This type of dustproof mechanism for pneumatic grinding machines uses an air blowing component at the other end of the filter assembly to blow filtered clean air in the opposite direction to the unpolished area of ​​the workpiece surface. This reduces the wear rate of the grinding wheel caused by rust or other solids remaining on the workpiece surface, while simultaneously improving the grinding effect.

[0021] This type of dust prevention mechanism for pneumatic grinding machines uses a dust suction component installed at the input end of the exhaust assembly to suck in the dust generated during grinding, thereby reducing the scattering of dust.

[0022] This type of dustproof mechanism for pneumatic grinding wheels connects the air blowing component and the dust suction component. When the grinding wheel wears down and becomes thinner during grinding, it can always maintain a specific height between the dust suction component and the lowest surface of the grinding wheel, so that the dust suction effect is not affected by the wear of the grinding wheel.

[0023] This type of dustproof mechanism for pneumatic grinding machines uses a compression component at the upper end of the connecting assembly that can control its lifting and lowering. After the connecting assembly begins to rise due to the thinning of the grinding wheel, it restricts the connecting assembly to only rise and not fall. This prevents the connecting assembly from falling due to vibration or other reasons, thus avoiding obstruction of the contact between the grinding wheel and the workpiece, and also ensuring that the subsequent grinding effect is not affected. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the overall appearance of the invention from a first perspective; Figure 2 This is a schematic diagram of the overall appearance of the invention from a second perspective; Figure 3 This is a schematic diagram of the overall appearance of the invention from a third perspective; Figure 4 This is a detailed connection diagram of the grinding wheel body, transmission rod, and grinding wheel of the present invention; Figure 5 This is a detailed connection diagram of the components of the present invention, including the exhaust assembly, the filter assembly, and the air blowing assembly. Figure 6 This is a detailed connection diagram of the exhaust assembly and the filter assembly of the present invention; Figure 7 For the present invention Figure 6 Explosion diagrams of various components; Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle; Figure 9 For the present invention Figure 6 A schematic diagram of the various components from another perspective; Figure 10 This is a detailed connection diagram of the air blowing component and the dust suction component of the present invention; Figure 11 For the present invention Figure 10 Enlarged view of point B in the middle; Figure 12 For the present invention Figure 10 Explosion diagrams of various components; Figure 13 For the present invention Figure 12 Enlarged view of point C in the middle; Figure 14 For the present invention Figure 12 Enlarged view of point D in the middle; Figure 15 This is a detailed connection diagram of the dust collection component and the connecting component of the present invention; Figure 16 For the present invention Figure 15 Explosion diagrams of various components; Figure 17 For the present invention Figure 16 Another perspective diagram of the various components.

[0025] In the diagram: 1. Grinding wheel body; 2. Air inlet pipe; 3. Pressing plate; 4. Exhaust pipe; 5. Air outlet pipe; 6. Return pipe; 7. Sealing plate; 8. Blower hood; 9. Exhaust pipe; 10. Sealing plug; 11. Spray pipe; 12. Connecting ring; 13. Air supply pipe; 14. Grinding wheel; 15. Transmission rod; 16. Clamping block; 17. External threaded ring; 18. Internal threaded ring; 19. Through hole; 20. Clamping point; 21. Dust collection screen; 2. Impeller; 23. Backflush port; 24. Clamping plate; 25. Suction pipe; 26. Replacement port; 27. Clamping port; 28. Sealing ring; 29. ​​Push rod; 30. Partition plate; 31. Movable rod; 32. External suction hood; 33. Air outlet; 34. One-way valve; 35. Air exchange chamber; 36. Air inlet chamber; 37. Support block; 38. Internal suction hood; 39. Suction chamber; 40. Lifting hood; 41. Anti-detachment ring; 42. Dust suction hole. Detailed Implementation

[0026] The technical solutions 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.

[0027] Please see Figures 1-17 A dust prevention mechanism for a pneumatic grinding wheel machine includes a grinding wheel body 1, an air inlet pipe 2 installed on one side of the grinding wheel body 1, a pressing plate 3 installed on the air inlet pipe 2, a transmission rod 15 installed at the lower end of the grinding wheel body 1, and a grinding wheel 14 installed on the transmission rod 15. A disassembly assembly is connected to one end of the grinding wheel body 1 near the transmission rod 15, and an exhaust assembly is connected to the other end of the disassembly assembly. A filter assembly is connected to the output end of the exhaust assembly, and an air blowing assembly is connected to the other end of the filter assembly. A dust suction assembly is connected to the input end of the exhaust assembly. The air blowing assembly is sleeved outside the dust suction assembly. The disassembly assembly, the exhaust assembly, and the dust suction assembly are all sleeved outside the transmission rod 15. The grinding wheel 14 is located inside the dust suction assembly, and the lower end of the air blowing assembly is flush with the lowest point of the grinding wheel 14.

[0028] The dust prevention mechanism for a pneumatic grinding machine in this invention is similar in structure to existing pneumatic grinding machines, such as the Beidi BD-5168 pneumatic grinding machine. Figures 1 to 17 As shown, the dust prevention mechanism for the pneumatic grinding wheel machine in this invention can be used according to the following steps: Connect the output end of the external air source device to the air inlet pipe 2, then place the bottom surface of the grinding wheel 14 on the workpiece to be ground, and then press the pressing plate 3 by hand to start the grinding wheel machine body 1 normally.

[0029] When the grinding wheel 14 is pressed onto the surface of the workpiece to be ground, the lowest point of the air blowing assembly simultaneously presses against the surface of the workpiece.

[0030] After the grinding machine body 1 is started, it drives the transmission rod 15 and the grinding wheel 14 to rotate through the airflow. At the same time as the transmission rod 15 and the grinding wheel 14 rotate, the exhaust assembly connected to the transmission rod 15 will also rotate.

[0031] When the exhaust component rotates, it generates negative pressure inside, which draws air from the vacuum component connected to the input end.

[0032] During the suction process of the dust collection component, the grinding wheel 14 is grinding the surface of the workpiece. While grinding, the waste chips and dust are scattered around the grinding wheel 14. At the same time, they are sucked into the exhaust component by the dust collection component.

[0033] Dust entering the exhaust assembly will enter the filter assembly from the exhaust assembly's output end, where it will be blocked by the filter assembly to remove solid matter. After that, clean air will enter the blowing assembly.

[0034] Clean air entering the air blowing assembly is sprayed out from the output end. Since the lowest point of the air blowing assembly is flush with the bottom surface of the grinding wheel 14, this air will be blown onto the surface of the workpiece that has not yet been ground by the grinding wheel 14. This will blow up rust and some particles on the surface of the workpiece. After being blown up, the air will be sucked into the exhaust assembly by the dust collection assembly. The above steps are then repeated to achieve circulation.

[0035] It is important to note here that: The grinding wheel body 1, air inlet pipe 2, pressing plate 3, transmission rod 15, and grinding wheel 14 are all existing technologies in the aforementioned "pneumatic grinding wheel machine with model number: Beidi BD-5168", therefore, their detailed working principle will not be described in detail.

[0036] Before grinding, the workpiece surface may have residual rust or other large, hard solid objects (such as small stones). If the grinding wheel 14 directly contacts these substances, it will not only affect the grinding effect, but may even press the rust or these solid objects into the workpiece, thereby increasing the scrap rate. Therefore, a pre-blowing process can be performed by the blowing component to reduce the impact of rust and solid objects on the workpiece grinding.

[0037] When it is necessary to inspect and repair the grinding machine body 1, the above-mentioned components can be separated from the grinding machine body 1 by disassembling the components.

[0038] As a preferred embodiment of the present invention, the disassembly assembly includes an external threaded ring 17 and an internal threaded ring 18. The upper end of the external threaded ring 17 is fixedly connected to the end of the grinding wheel body 1 near the transmission rod 15, and the lower end of the internal threaded ring 18 is connected to the upper end of the exhaust assembly. The inner wall of the internal threaded ring 18 is threadedly connected to the outer wall of the external threaded ring 17.

[0039] More specifically, when it is necessary to disassemble and separate the grinding wheel body 1 from the exhaust assembly and other components, simply rotate the exhaust assembly, and the internal threaded ring 18 at the upper end of the exhaust assembly can be unscrewed from the external threaded ring 17 by means of threads, thereby realizing the separation of the grinding wheel body 1 from the exhaust assembly and other components, which is convenient and easy to operate.

[0040] As a preferred embodiment of the present invention, the exhaust assembly includes an exhaust pipe 4, an exhaust pipe 5, an air extraction pipe 25, and a rotating assembly. The upper end of the exhaust pipe 4 is fixedly connected to the lower end of the internal threaded ring 18, the lower end of the exhaust pipe 4 is fixedly connected to the upper end of the air extraction pipe 25, the lower end of the air extraction pipe 25 is connected to the dust collection assembly, the side wall of the exhaust pipe 4 is fixedly connected to one end of the exhaust pipe 5, the other end of the exhaust pipe 5 is connected to the air blowing assembly, and the rotating assembly is located inside the exhaust pipe 4 and connected to the transmission rod 15.

[0041] More specifically, when it is necessary to absorb the dust generated during the grinding of the grinding wheel 14, after the grinding machine body 1 is started, the transmission rod 15 can rotate. When the transmission rod 15 rotates, it will drive the rotating component to rotate inside the exhaust pipe 4. After the rotating component rotates, a negative pressure can be formed inside the exhaust pipe 4, so that air (dust) can be drawn in from the dust collection component through the exhaust pipe 25 and then discharged from the exhaust pipe 5, thereby realizing the subsequent dust collection and back-blowing steps.

[0042] As a preferred embodiment of the present invention, the rotating assembly includes an impeller 22 and a plurality of locking blocks 16. The upper surface of the impeller 22 and the upper surface of the exhaust pipe 4 are both provided with through openings 19. The inner wall of each through opening 19 is provided with a plurality of locking slots 20. The plurality of locking blocks 16 are fixedly connected to the outer wall of the transmission rod 15. The outer walls of the plurality of locking blocks 16 are slidably connected to the inner walls of the plurality of locking slots 20. The impeller 22 is connected to the transmission rod 15 through the plurality of locking slots 20 and locking blocks 16. The impeller 22 is located inside the exhaust pipe 4, and the upper surface and bottom surface of the impeller 22 are slidably connected to the upper surface and bottom surface of the inner wall of the exhaust pipe 4, respectively.

[0043] More specifically, when the transmission rod 15 rotates, the transmission rod 15 can drive the impeller 22 to rotate together through several locking blocks 16 on its surface. After the impeller 22 rotates, a negative pressure is formed inside the exhaust pipe 4, thereby achieving the effect of "one in and one out" of the air inside the exhaust pipe 25 and the exhaust pipe 5.

[0044] It is important to note here that: During installation, since the upper surfaces of both the impeller 22 and the exhaust pipe 4 are provided with through holes 19 and bayonets 20, and since the exhaust pipe 4 is inserted into the grinding machine body 1 from below the transmission rod 15 and then connected through the external threaded ring 17 and the internal threaded ring 18, during installation, it is only necessary to align the through holes 19 of the impeller 22 and the exhaust pipe 4 with the transmission rod 15 and insert them. After moving them to the appropriate position, the bayonets 20 are aligned with the locking block 16. Finally, the exhaust pipe 4 is rotated, and the connection between the exhaust pipe 4 and the grinding machine body 1 is stabilized through the external threaded ring 17 and the internal threaded ring 18. Since the impeller 22 rotates inside the exhaust pipe 4, the impeller 22 and the transmission rod 15 will be in a relatively stationary state during the rotation and tightening of the external threaded ring 17 and the internal threaded ring 18, and will not affect each other.

[0045] The heights of the slot 20 on the impeller 22 and the locking block 16 must match. At least after the exhaust pipe 4 is stably connected to the grinding machine body 1, the highest point of the locking block 16 should not be higher than the highest point of the slot 20 on the impeller 22. This is to avoid the exhaust pipe 4 rotating together with the transmission rod 15 during rotation due to the locking block 16.

[0046] As a preferred embodiment of the present invention, the filter assembly includes a return pipe 6, a sealing plate 7, a dust collection screen 21, and a clamping plate 24. A clamping opening 27 is provided on the side of the outlet pipe 5 away from the exhaust pipe 4. The outer wall of the clamping plate 24 is slidably connected to the inner wall of the clamping opening 27. The side of the clamping plate 24 away from the clamping opening 27 is fixedly connected to one end of the dust collection screen 21. The upper end of the return pipe 6 is fixedly connected to the end of the outlet pipe 5 away from the exhaust pipe 4. The lower end of the return pipe 6 is connected to the air blowing assembly. A replacement port 26 is provided through the upper surface of the return pipe 6. The outer wall of the lower end of the sealing plate 7 is slidably connected to the inner wall of the replacement port 26. The upper end of the sealing plate 7 is fastened to the outer wall of the upper surface of the return pipe 6 and the outlet pipe 5 by several bolts. The lengths of the replacement port 26 and the sealing plate 7 are not less than the total length of the dust collection screen 21 and the clamping plate 24.

[0047] More specifically, when the inhaled dust is discharged from the air outlet pipe 5 under the action of the impeller 22, it will enter the dust collection screen 21. The dust will then be blocked by the dust collection screen 21, while clean air will flow out from the aperture of the dust collection screen 21 and enter the return pipe 6, and then enter the air blowing assembly from the lower end of the return pipe 6.

[0048] After the dust collection screen 21 has been used for a period of time, a certain amount of dust will accumulate inside it. In order to increase the filtration effect and reduce the overall failure rate, the sealing plate 7 can be opened. After the sealing plate 7 is opened, the dust collection screen 21 and the clamping plate 24 can be taken out from the clamp 27 between the return pipe 6 and the air outlet pipe 5. Then, they can be taken out from the replacement port 26 to the outside for cleaning and replacement. It is convenient and easy to operate.

[0049] It should be noted that: Dust collection net 21 only refers to its function of filtering and separating dust. It is not necessary to use dust collection net 21. Filter bags, filter cloths or other items can also be used. There is no specific limitation. Moreover, these filter materials can also have other functions (such as sterilization and disinfection, because some dust may contain some harmful substances, which can be filtered and adsorbed through this). The actual use shall prevail. There is no specific limitation.

[0050] In a preferred embodiment of the present invention, the air blowing assembly includes a blower hood 8, an exhaust pipe 9, a sealing plug 10, an air supply pipe 13, a one-way valve 34, a partition 30, a compression assembly, and a connecting assembly. The inner wall of the upper end of the blower hood 8 is fixedly connected to the outer wall of the suction pipe 25. A backflow port 23 extends through one side of the blower hood 8. The lower end of the return pipe 6 is fixedly connected to the side wall of the blower hood 8. An air inlet chamber 36 is formed in the inner wall of the blower hood 8. The upper end of the connecting assembly is located in the air inlet chamber 36, and the lower end of the connecting assembly extends through the lower end of the blower hood 8 to the outside and is connected to the dust collection assembly. The side wall of the partition 30 is connected to the inner wall of the air inlet chamber 36. The components are fixedly connected, and the backflush port 23 is located below the partition 30. The partition 30 has an air exchange chamber 35 above it. The upper end of the compression assembly is located in the air exchange chamber 35, and the lower end of the compression assembly passes through the partition 30 and is connected to the end of the connecting assembly located in the air inlet chamber 36. The lower ends of the exhaust pipe 9 and the gas filling pipe 13 are fixedly connected to the upper end of the blower hood 8. The lower end of the sealing plug 10 is threadedly connected to the inner wall of the gas filling pipe 13. The one-way valve 34 is located inside the exhaust pipe 9. The return pipe 6, the backflush port 23, the air inlet chamber 36 and the connecting assembly are connected. The exhaust pipe 9, the gas filling pipe 13 and the air exchange chamber 35 are connected.

[0051] More specifically, when clean air enters the back-blowing port 23 from the return pipe 6, it quickly enters the air inlet chamber 36 and the interior of the connecting assembly from the back-blowing port 23. Then, this gas is ejected from the end of the connecting assembly located outside the blower hood 8, thereby achieving back-blowing of the un-polished area of ​​the workpiece. This can blow away some rust or other solids in advance, thereby reducing the wear rate of the grinding wheel 14 and improving the workpiece polishing effect at the same time.

[0052] Additionally, because the grinding wheel 14 wears down during grinding, becoming thinner and thinner, to compensate for the height change between the dust collection component and the grinding wheel 14 during this period, when the grinding wheel 14 becomes thinner, the bottom of the connecting component is flush with the bottom surface of the grinding wheel 14. Therefore, the connecting component will be pushed upward by the workpiece, which can slowly push the connecting component back into the air inlet cavity 36. At the same time as the connecting component returns to the air inlet cavity 36, the connecting component will also push the compression component located in the blower hood 8 upward. As the compression component moves upward, it will gradually compress the space in the air exchange cavity 35. This ensures that the connecting component can move upward without increasing the additional reaction force (such as spring push, which would provide an additional reaction force, thus increasing the manual pressing pressure of the processing personnel and increasing the hand load).

[0053] When a processing cycle is completed, or when the grinding wheel 14 is worn out and can no longer be used, the grinding wheel 14 is disassembled and replaced according to the current normal procedure (this is existing technology and will not be described in detail here). Then, the sealing plug 10 that was previously sealed inside the air supply pipe 13 is unscrewed, and the connecting component is manually pulled down. At this time, the connecting component moves down, which can move the compression component down with it. Then, the outside air enters the air exchange chamber 35 from the air supply pipe 13, and the next cycle can be continued.

[0054] As a preferred embodiment of the present invention, the compression assembly includes a sealing ring 28 and a plurality of push rods 29. The side wall of the sealing ring 28 is slidably connected to the inner wall of the air exchange chamber 35, and the bottom surface of the sealing ring 28 is fixedly connected to the upper ends of the plurality of push rods 29. The lower ends of the plurality of push rods 29 all penetrate the partition 30 and are connected to one end of the connecting assembly located in the air inlet chamber 36.

[0055] More specifically, when the connecting assembly gradually moves upward in contact with the workpiece, it will push the push rod 29 upward as well. After the push rod 29 moves upward, it will push the sealing ring 28 located in the ventilation chamber 35 at the other end of the push rod 29 upward as well. This allows the air in the ventilation chamber 35 to be discharged to the outside through the one-way valve 34 of the exhaust pipe 9. At this time, because the one-way valve 34 cannot allow air to enter in the reverse direction, and the air supply pipe 13 is sealed by the sealing plug 10, the sealing ring 28 can only move upward and cannot descend. Therefore, the connecting assembly will not descend due to vibration or other reasons, thus preventing the grinding wheel 14 from contacting the workpiece and affecting the grinding effect.

[0056] As a preferred embodiment of the present invention, the connecting assembly includes a connecting ring 12, a plurality of nozzles 11 and a plurality of movable rods 31. The upper ends of the plurality of movable rods 31 are respectively fixedly connected to one end of a plurality of push rods 29 that penetrates the partition 30. The lower ends of the plurality of movable rods 31 are respectively fixedly connected to the upper ends of the plurality of nozzles 11. The lower ends of the plurality of nozzles 11 all penetrate the lower end of the blower hood 8 and the connecting ring 12. The outer walls of the plurality of nozzles 11 are all fixedly connected to the inner wall of the connecting ring 12. The side wall of the connecting ring 12 is connected to the air intake assembly. The lowest point of the plurality of nozzles 11 is flush with the bottom surface of the grinding wheel 14. The side walls of the plurality of movable rods 31 are all provided with air inlets 33. The air inlet 36, the plurality of air inlets 33 and the plurality of nozzles 11 are internally connected.

[0057] More specifically, when clean air enters the air inlet chamber 36 through the backflow pipe 6 and the backflow port 23, the air enters the movable rod 31 through several air outlets 33, then enters the nozzle 11 through the movable rod 31, and finally is ejected from the end of the nozzle 11 located outside the air blower 8, thereby blowing air onto the surface of the unpolished workpiece, thus achieving the purpose of "reducing the wear rate of the polishing wheel 14 and improving the polishing effect of the workpiece at the same time".

[0058] Additionally, initially, the bottom of the nozzle 11 contacts the workpiece surface. As the grinding wheel 14 becomes thinner, the nozzle 11 gradually moves upward under the pressure of the workpiece (because the grinding wheel 14 is always pressed against the workpiece surface by the operator). During the upward movement of the nozzle 11, the connecting ring 12 moves upward along with it, and the upward movement of the connecting ring 12 moves the dust collection component upward along with it, thus ensuring that the dust collection component and the grinding wheel 14 are always at a specific height. At the same time, the upward movement of the nozzle 11 pushes the push rod 29 located inside the blower hood 8 upward, so that it can move within the ventilation chamber 35 through the sealing ring 28.

[0059] As a preferred embodiment of the present invention, the dust collection assembly includes an outer suction hood 32, an inner suction hood 38, a plurality of support blocks 37, and a telescopic assembly. The inner wall of the upper end of the outer suction hood 32 is fixedly connected to the outer wall of the lower end of the suction pipe 25. The middle part of the bottom surface of the outer suction hood 32 is fixedly connected to the upper end of the plurality of support blocks 37. The lower ends of the plurality of support blocks 37 are all fixedly connected to the middle part of the outer wall of the inner suction hood 38. A suction chamber 39 is separated between the outer suction hood 32 and the inner suction hood 38 by the plurality of support blocks 37. The upper end of the telescopic assembly is located in the suction chamber 39. The lower end of the telescopic assembly passes through the lower ends of the outer suction hood 32 and the inner suction hood 38 and is connected to the inner side wall of the connecting ring 12. The transmission rod 15 passes through the middle part of the outer suction hood 32 and the inner suction hood 38. The grinding wheel 14 is located inside the inner suction hood 38. The suction pipe 25, the outer suction hood 32, the inner suction hood 38, and the telescopic assembly are internally connected.

[0060] More specifically, after the transmission rod 15 rotates, the impeller 22 rotates together. At this time, because a negative pressure is formed inside the exhaust pipe 4, air is drawn in through the exhaust pipe 25 from the middle of the outer suction hood 32 and the inner suction hood 38 (i.e., the gap between several support blocks 37). At the same time as the air is drawn in, air is also drawn in from the external environment (i.e., around the grinding wheel 14) through the telescopic component. Thus, while the air is drawn in, the dust generated during the grinding of the grinding wheel 14 is drawn into the exhaust pipe 4, thereby achieving the above steps.

[0061] In addition, when the connecting ring 12 moves upward under the push of the nozzle 11, it will cause the telescopic component to slide inside the suction chamber 39, so that normal lifting and lowering can be achieved without affecting normal dust collection, thus ensuring that the lower end of the telescopic component can always be at a specific height with the grinding wheel 14.

[0062] As a preferred embodiment of the present invention, the telescopic assembly includes a lifting cover 40 and two anti-detachment rings 41. The two anti-detachment rings 41 are fixedly connected to the two side walls of the upper end of the lifting cover 40, respectively. The outer walls of the lifting cover 40 and the two anti-detachment rings 41 are slidably connected to the inner wall of the suction chamber 39. The lower end of the lifting cover 40 passes through the lower ends of the outer suction cover 32 and the inner suction cover 38, and one end of the lifting cover 40 that passes through the suction chamber 39 is fixedly connected to the inner side wall of the connecting ring 12. A plurality of dust suction holes 42 are provided through the bottom surface and the inner side of the lower end of the lifting cover 40.

[0063] More specifically, during normal vacuuming, the negative pressure generated by the impeller 22 draws in air and dust through the suction chamber 39 and several suction holes 42, thereby preventing the dust from affecting the external environment and operators.

[0064] Additionally, when the connecting ring 12 moves upward, the lifting cover 40 will also move upward along with the connecting ring 12, so that the dust suction holes 42 on the bottom and side walls of the lifting cover 40 can always maintain a specific height with the grinding wheel 14.

[0065] It should be noted that dust suction holes 42 are provided on the bottom surface and the inner side of the lower end of the lifting cover 40, which can simultaneously suction dust from the side of the grinding wheel 14 and the upper surface of the workpiece, resulting in a higher adsorption effect.

[0066] 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 dustproof mechanism for a pneumatic grinder, comprising a grinder body (1), an air inlet pipe (2) installed on one side of the grinder body (1), a pressing plate (3) installed on the air inlet pipe (2), a transmission rod (15) installed on the lower end of the grinder body (1), and a polishing wheel (14) installed on the transmission rod (15), characterized in that: The sanding machine body (1) is connected with a disassembly assembly near one end of the transmission rod (15), the other end of the disassembly assembly is connected with an air extraction assembly, the output end of the air extraction assembly is connected with a filter assembly, the other end of the filter assembly is connected with a blowing assembly, the input end of the air extraction assembly is connected with a dust collection assembly, the blowing assembly is sleeved outside the dust collection assembly, the disassembly assembly, the air extraction assembly and the dust collection assembly are all sleeved outside the transmission rod (15), the grinding wheel (14) is located inside the dust collection assembly, and the lower end of the blowing assembly is flush with the lowest point of the grinding wheel (14).

2. The dust-proof mechanism of a pneumatic grinder according to claim 1, wherein: The disassembly assembly comprises an outer threaded ring (17) and an inner threaded ring (18), the upper end of the outer threaded ring (17) is fixedly connected with the sanding machine body (1) near one end of the transmission rod (15), and the lower end of the inner threaded ring (18) is connected with the upper end of the air extraction assembly.

3. The dust-proof mechanism of a pneumatic grinder according to claim 2, wherein: The air extraction assembly comprises an air extraction pipe (4), an air outlet pipe (5), an air extraction pipe (25) and a rotating assembly, the upper end of the air extraction pipe (4) is fixedly connected with the lower end of the inner threaded ring (18), the lower end of the air extraction pipe (4) is fixedly connected with the upper end of the air extraction pipe (25), the lower end of the air extraction pipe (25) is connected with the dust collection assembly, the side wall of the air extraction pipe (4) is fixedly connected with one end of the air outlet pipe (5), the other end of the air outlet pipe (5) is connected with the blowing assembly, and the rotating assembly is located inside the air extraction pipe (4) and connected with the transmission rod (15).

4. The dust-proof mechanism of a pneumatic grinder according to claim 3, wherein: The rotating assembly comprises an impeller (22) and a plurality of clamping blocks (16), the upper surfaces of the impeller (22) and the air extraction pipe (4) are both provided with through holes (19), the inner walls of the through holes (19) are both provided with a plurality of clamping holes (20), the outer walls of the plurality of clamping blocks (16) are fixedly connected with the outer wall of the transmission rod (15), the outer walls of the plurality of clamping blocks (16) are respectively connected with the inner walls of the plurality of clamping holes (20) in a sliding mode, the impeller (22) is connected with the transmission rod (15) through the plurality of clamping holes (20) and the clamping blocks (16), and the impeller (22) is located inside the air extraction pipe (4) and connected with the upper surface and the bottom surface of the inner wall of the air extraction pipe (4) in a sliding mode.

5. The dust-proof mechanism of a pneumatic grinder according to claim 4, wherein: The filter assembly comprises a backflow pipe (6), a sealing plate (7), a dust collection net (21) and a clamping plate (24), the side, away from the air extraction pipe (4), of the air outlet pipe (5) is provided with a clamping opening (27), the outer wall of the clamping plate (24) is connected with the inner wall of the clamping opening (27) in a sliding mode, one side, away from the clamping opening (27), of the clamping plate (24) is fixedly connected with one end of the dust collection net (21), the upper end of the backflow pipe (6) is fixedly connected with one end, away from the air extraction pipe (4), of the air outlet pipe (5), the lower end of the backflow pipe (6) is connected with the blowing assembly, the upper surface of the backflow pipe (6) is provided with a replacement opening (26), the outer wall of the lower end of the sealing plate (7) is connected with the inner wall of the replacement opening (26) in a sliding mode, the upper end of the sealing plate (7) is fastened with the outer walls of the upper surfaces of the backflow pipe (6) and the air outlet pipe (5) through a plurality of bolts, and the lengths of the replacement opening (26) and the sealing plate (7) are not less than the total length of the dust collection net (21) and the clamping plate (24).

6. The dust-proof mechanism of a pneumatic grinder according to claim 5, wherein: The blowing assembly comprises a blowing cover (8), an exhaust pipe (9), a sealing plug (10), a gas feeding pipe (13), a one-way valve (34), a partition plate (30), a compression assembly and a connecting assembly, the inner side wall of the upper end of the blowing cover (8) is fixedly connected with the outer wall of the exhaust pipe (25), the blowing cover (8) is penetrated by a back blowing port (23) on one side, the lower end of the backflow pipe (6) is fixedly connected with the side wall of the blowing cover (8), the inner wall of the blowing cover (8) is provided with an air inlet cavity (36), the upper end of the connecting assembly is located in the air inlet cavity (36), the lower end of the connecting assembly penetrates the lower end of the blowing cover (8) to the outside and is connected with the dust suction assembly, the side wall of the partition plate (30) is fixedly connected with the inner wall of the air inlet cavity (36), and the back blowing port (23) is located below the partition plate (30), the upper part of the partition plate (30) is separated from the air exchange cavity (35), the upper end of the compression assembly is located in the air exchange cavity (35), the lower end of the compression assembly penetrates the partition plate (30) and is connected with one end of the connecting assembly located in the air inlet cavity (36), the lower ends of the exhaust pipe (9) and the gas feeding pipe (13) are fixedly connected with the upper end of the blowing cover (8), the lower end of the sealing plug (10) is threadedly connected with the inner wall of the gas feeding pipe (13), the one-way valve (34) is located in the exhaust pipe (9), the backflow pipe (6), the back blowing port (23), the air inlet cavity (36) and the connecting assembly are in communication, and the exhaust pipe (9), the gas feeding pipe (13) and the air exchange cavity (35) are in communication.

7. The dust-proof mechanism of a pneumatic grinder according to claim 6, wherein: The compression assembly comprises a sealing ring (28) and a plurality of push rods (29), the side wall of the sealing ring (28) is slidably connected with the inner wall of the air exchange cavity (35), the bottom surface of the sealing ring (28) is fixedly connected with the upper ends of the plurality of push rods (29), and the lower ends of the plurality of push rods (29) penetrate the partition plate (30) and are connected with one end of the connecting assembly located in the air inlet cavity (36).

8. The dust-proof mechanism of a pneumatic grinder according to claim 7, wherein: The connecting assembly comprises a connecting ring (12), a plurality of spray pipes (11) and a plurality of movable rods (31), the upper ends of the plurality of movable rods (31) are fixedly connected with one end of the plurality of push rods (29) penetrating the partition plate (30) respectively, the lower ends of the plurality of movable rods (31) are fixedly connected with the upper ends of the plurality of spray pipes (11) respectively, the lower ends of the plurality of spray pipes (11) penetrate the lower end of the blowing cover (8) and the connecting ring (12), and the outer walls of the plurality of spray pipes (11) are fixedly connected with the inner wall of the connecting ring (12), the side wall of the connecting ring (12) is connected with the air suction assembly, the lowest points of the plurality of spray pipes (11) are flush with the bottom surface of the polishing wheel (14), and the side walls of the plurality of movable rods (31) are penetrated by blowing ports (33), the air inlet cavity (36), the plurality of blowing ports (33) and the plurality of spray pipes (11) are in communication.

9. The dust-proof mechanism of a pneumatic grinder according to claim 8, wherein: The dust suction assembly comprises an outer suction cover (32), an inner suction cover (38), a plurality of supporting blocks (37) and a telescopic assembly, the inner wall of the upper end of the outer suction cover (32) is fixedly connected with the outer wall of the lower end of the air suction pipe (25), the middle part of the bottom surface of the outer suction cover (32) is fixedly connected with the upper ends of the plurality of supporting blocks (37), the lower ends of the plurality of supporting blocks (37) are fixedly connected with the middle part of the outer wall of the inner suction cover (38), the outer suction cover (32) and the inner suction cover (38) are separated by the plurality of supporting blocks (37) to form a suction cavity (39), the upper end of the telescopic assembly is located in the suction cavity (39), the lower end of the telescopic assembly penetrates the lower ends of the outer suction cover (32) and the inner suction cover (38) and is connected with the inner side wall of the connecting ring (12), the transmission rod (15) penetrates the middle parts of the outer suction cover (32) and the inner suction cover (38), the polishing wheel (14) is located in the inner suction cover (38), the air suction pipe (25), the outer suction cover (32), the inner suction cover (38) and the telescopic assembly are in communication.

10. The dust-proof mechanism of a pneumatic grinder according to claim 9, wherein: The telescopic assembly comprises a lifting cover (40) and two anti-dropping rings (41), the two anti-dropping rings (41) are fixedly connected with the two side walls of the upper end of the lifting cover (40), the outer walls of the lifting cover (40) and the two anti-dropping rings (41) are slidably connected with the inner wall of the suction cavity (39), the lower end of the lifting cover (40) penetrates the lower ends of the outer suction cover (32) and the inner suction cover (38), and one end of the lifting cover (40) penetrating the suction cavity (39) is fixedly connected with the inner side wall of the connecting ring (12), the bottom surface and the inner side of the lower end of the lifting cover (40) are provided with a plurality of dust suction holes (42).

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