Gas purification handheld pneumatic grinding machine

Abstract

The utility model provides a gas purification handheld pneumatic grinding machine which comprises an internal gas circulation path assembly and a gas inlet part arranged at the rear end of the grinding machine, the handheld pneumatic grinding machine comprises a handheld main body, an internal purification assembly and an external purification assembly, and the gas inlet part and a first exhaust port are arranged at the rear end of the handheld main body; a second exhaust port is formed in the side portion of the handheld body, an internal purification assembly is arranged at the second exhaust port, the internal purification assembly is detachably connected to the second exhaust port and comprises an absorption layer and a filtering layer, the first exhaust port communicates with an external purification assembly, and the external purification assembly is arranged outside the handheld body and comprises multiple stages of filtering layers. In this way, multi-layer purification and treatment are conducted on the interior of the handheld pneumatic grinding machine, the purification assembly in the machine can be replaced, disassembled and assembled conveniently, the service life is prolonged, and the operation experience is optimized.

Description

Technical Field

[0001] The present application relates to the technical field of grinding equipment, and in particular to a gas-purified handheld pneumatic grinder. Background Art

[0002] Abrasives are tools used for grinding, lapping and polishing. They are usually made by fixing abrasives on flexible materials such as paper, cloth, film or composite matrix with adhesives. Common ones are sandpaper and emery cloth. Some small grinders can achieve the grinding effect by equipping the grinding wheel with abrasive belts. They are lightweight, portable and easy to replace.

[0003] Generally, for the convenience of use and the user's holding, many handheld grinders have appeared on the market to facilitate the user's holding and use and optimize the user's operating feel. For pneumatic grinders, it is often necessary to supply gas to drive the internal rotating result to rotate, and then drive the external grinding head to rotate and grind. For example, there are handheld pneumatic grinders with handheld grip structures such as CN210388840U and CN204248612U in the prior art, and there are also handheld pneumatic grinders with pen-like structures such as CN211439400U (here specifically referring to the outer shell holding structure of this type of handheld grinder).

[0004] Taking a handheld pneumatic grinder with a grip structure as an example, when in use, since it is necessary to ensure the smooth rotation of the grinding head, it is necessary to regularly add lubricating oil to the inside of the grinder to lubricate it and ensure smooth and reliable operation. Driven by the incoming gas, the lubricating oil creates an oil and gas environment inside the grinder. However, since the handheld pneumatic grinder often needs to exhaust to the outside when in use, the exhaust often leads to the discharge of internal oil and gas. If the exhaust port is set at the rear of the grinder, the oil and gas will be discharged toward the user, affecting the user. Even if some handheld pneumatic grinders are set on the side or top, they may still be sprayed toward the user again due to the problem of grinding angle during grinding. Moreover, if too much oil and gas are discharged, it is easy to cause pollution to the object being grinded, affecting subsequent work efficiency. In addition, the exhausted gas is often discharged directly into the working environment, which is difficult to effectively treat and utilize.

[0005] Therefore, the prior art needs to be further improved and enhanced. Utility Model Content

[0006] The present application provides a gas-purifying handheld pneumatic grinder to solve the problems in the prior art that the handheld pneumatic grinder is difficult to handle the oil and gas discharge during exhaust, which affects the staff and the working environment and is difficult to effectively utilize the exhaust gas.

[0007] The technical solution adopted in this application is:

[0008] The present application provides a gas-purifying handheld pneumatic grinder, comprising an internal gas circulation path component and an air intake portion arranged at the rear end of the grinder, the handheld pneumatic grinder comprising a handheld main body, an internal purification component and an external purification component, the rear end of the handheld main body is provided with an air intake portion and a first exhaust port, the side of the handheld main body is provided with a second exhaust port, an internal purification component is provided at the second exhaust port, the internal purification component is detachably connected to the second exhaust port, the internal purification component comprises an absorption layer and a filter layer, the first exhaust port is connected to the external purification component, the external purification component is arranged on the outside of the handheld main body and comprises a multi-stage filter layer.

[0009] As a preferred embodiment of the present application, the in-machine purification component also includes an outer shell, one end of the outer shell is provided with a connection position, and one end of the second exhaust port is provided with a matching position, and the two are threadedly connected.

[0010] As a preferred embodiment of the present application, the in-machine purification component also includes a movable exhaust window, and the movable exhaust window is provided with adjustable fan blades.

[0011] As a preferred embodiment of the present application, the movable exhaust window is detachably connected to the outer shell, and an exhaust net parallel to the movable exhaust window is arranged inside the movable exhaust window.

[0012] As a preferred embodiment of the present application, the movable exhaust window also includes an outer frame, an inner frame and movable blades, the movable blades are arranged in the inner frame, the outer frame and the inner frame coincide with each other in the center and are coplanar, the outer frame surrounds the outer side of the inner frame and the inner frame is rotatably connected to the outer frame.

[0013] As a preferred embodiment of the present application, the absorption layer and the filter layer are arranged in parallel to the movable exhaust window, and the two are arranged sequentially along the length direction of the outer shell.

[0014] As a preferred embodiment of the present application, the outer shell includes a first purification section and a second purification section, both of which are respectively provided with an absorption layer and a filtration layer, the two ends of the first purification section are respectively connected to the second exhaust port and the second purification section, the two ends of the second purification section are respectively connected to the first purification section and the movable exhaust window, and the first purification section partially extends into the second exhaust port.

[0015] As a preferred embodiment of the present application, the off-machine purification component includes a box body, a multi-stage filter layer, an air inlet and an air outlet, the air inlet is connected to the first exhaust port and / or the second exhaust port, the air outlet is arranged on the side wall of the box body, and the air inlet is arranged on the top of the box body and an air inlet pipe extends outward.

[0016] As a preferred embodiment of the present application, the multi-stage filtration layer includes a coarse filtration layer, an activated carbon layer and a precision filtration layer, which are arranged in sequence from top to bottom.

[0017] As a preferred embodiment of the present application, the external purification component also includes an air inlet fan and an air outlet fan, which are respectively arranged at the air inlet and the air outlet.

[0018] Due to the adoption of the above technical solution, the technical effects achieved by this application are:

[0019] 1. The present application provides a gas-purifying handheld pneumatic grinder, which performs doubly purification on the gas discharged from the handheld pneumatic grinder by arranging an internal purification component and an external purification component. Furthermore, since the oil gas generated by the lubricating oil is prone to viscosity and accumulation, a detachable connection is provided between the internal purification component and the second exhaust port. The internal purification component can be replaced or cleaned after the equipment has been used for a period of time. The disassembly and assembly is simple, the use is convenient, and the service life of the equipment is greatly improved. The subsequent external purification component can not only collect the discharged gas and reduce the amount of gas discharged in the working environment, but also further process the oil gas through a multi-stage filtration layer to further purify and utilize the gas.

[0020] 2. As a preferred embodiment of the present application, the present application arranges an outer shell and one end of the second exhaust port to be connected by a thread, which is not only convenient for disassembly and assembly, but also can improve the sealing performance and reduce gas leakage; and, by arranging the in-machine purification component also includes a movable exhaust window, so that the exhaust angle can be adjusted by the adjustable fan blades of the movable exhaust window. Furthermore, in order to avoid the limited adjustment angle of the adjustable fan blades, the present application also arranges a movable exhaust window including an inner frame and an outer frame. By rotating the inner frame, the inner frame drives the movable exhaust fan to rotate, thereby increasing the adjustment angle, better adapting to different grinding angles and working conditions, and optimizing the use experience and usage scenarios.

[0021] 3. As a preferred embodiment of the present application, the present application provides an outer shell including a first purification section and a second purification section, so that the outer shell can be disassembled and assembled in sections, which is convenient for disassembly, replacement and cleaning of each section, thereby reducing cost expenditure, and by arranging an absorption layer and a filter layer to absorb oil and gas, the oil and gas content of the exhaust gas is reduced, thereby reducing the impact on the working environment and staff; in addition, by arranging an exhaust net, the effect of shielding oil and gas can be further achieved.

[0022] 4. As a preferred embodiment of the present application, the present application further purifies and cleans the gas discharged from the first exhaust port by setting up a multi-stage filtration layer in an external purification component, and collects it through a box body, and the setting of the air outlet can discharge the treated and purified gas, so as to effectively treat and utilize the purified gas, further improving the gas utilization rate and treatment effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present application and do not constitute an improper limitation on the present invention. In the drawings:

[0024] Figure 1 A schematic diagram of the overall structure of a gas-purified handheld pneumatic grinder provided in this application;

[0025] Figure 2 A schematic diagram of the top view of a gas-purified handheld pneumatic grinder provided in the present application;

[0026] Figure 3 A schematic diagram of the overall structure of a gas-purified handheld pneumatic grinder according to another embodiment provided by the present application;

[0027] Figure 4 A schematic top view of a gas-purified handheld pneumatic grinder according to another embodiment of the present application;

[0028] Figure 5 A schematic diagram of the structure of a movable exhaust fan of a gas-purifying handheld pneumatic grinder provided in the present application;

[0029] Figure 6 A schematic diagram of the connection structure of a handheld main body and an external purification component of a gas-purifying handheld pneumatic grinder provided in the present application.

[0030] Reference numerals:

[0031] 10 handheld body; 11 first exhaust port; 12 second exhaust port; 13 air inlet;

[0032] 20 internal purification component; 21 absorption layer; 22 filter layer; 23 outer shell; 24 movable exhaust window; 241 adjustable fan blade; 242 inner frame; 243 outer frame; 25 first purification section; 26 second purification section;

[0033] 30 external purification component; 31 box; 32 multi-stage filter layer; 321 coarse filter layer; 322 activated carbon layer; 323 precision filter layer; 33 air inlet; 34 air outlet;

[0034] 40 grinding heads. DETAILED DESCRIPTION

[0035] In order to more clearly illustrate the overall concept of the present application, a detailed description is given below in an illustrative manner in conjunction with the accompanying drawings.

[0036] In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present application is not limited to the specific embodiments disclosed below.

[0037] In addition, in the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "top", "bottom", "inside", "outside", "axial", "radial", "circumferential", etc. are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0038] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0039] In the present application, unless otherwise clearly specified and limited, a first feature "above" or "below" a second feature may be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example" or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in an appropriate manner in any one or more embodiments or examples.

[0040] like Figures 1 to 6As shown, the present application provides a gas-purifying handheld pneumatic grinder, including an internal gas circulation path component and an air intake portion 13 arranged at the rear end of the grinder, the handheld pneumatic grinder includes a handheld main body 10, an internal purification component 20 and an external purification component 30, the air intake portion 13 and a first exhaust port 11 are arranged at the rear end of the handheld main body 10, a second exhaust port 12 is arranged on the side of the handheld main body 10, an internal purification component 20 is arranged at the second exhaust port 12, the internal purification component 20 is detachably connected to the second exhaust port 12, the internal purification component 20 includes an absorption layer 21 and a filter layer 22, the first exhaust port 11 is connected to the external purification component 30, the external purification component 30 is arranged on the outside of the handheld main body 10, and includes a multi-stage filter layer 3222.

[0041] like Figure 1 and Figure 3 As shown, the present application takes the handheld pneumatic grinder shown in the figure as an example, which includes a grinding component and a handheld body 10. The grinding component is the same as the existing grinder and adopts a similar internal structure. Therefore, the present application does not describe it in detail. The handheld body 10 is perpendicular to the grinding head 40 of the grinding component.

[0042] Among them, the handheld body 10 can be provided with friction protrusions to improve the feel and friction when the staff holds it, thereby improving the holding effect. Moreover, for in-machine purification, it can also include an outer shell 23, one end of the outer shell 23 is provided with a connection position, and one end of the second exhaust port 12 is provided with a matching position, and the two are threadedly connected.

[0043] The connection between the outer shell 23 and the second exhaust port 12 of the handheld body 10 may be configured in different ways. Here, the present application will be described in the following two different embodiments:

[0044] Embodiment 1:

[0045] In this embodiment, if Figure 1 and Figure 2 As shown, the outer shell 23 is perpendicular to the handheld body 10, and the second exhaust port 12 extends into the interior of the outer shell 23 in the horizontal direction and is arranged on the side, so that the outer shell 23 is arranged and connected to the outer edge of the handheld body 10, presenting an L-shaped structure when viewed from a top view.

[0046] Embodiment 2:

[0047] In this embodiment, if Figure 3 and Figure 4As shown, there is an angle between the outer shell 23 and the handheld body 10, and the second exhaust port 12 extends into the interior of the outer shell 23 in an inclined direction and is arranged on the side, finally presenting that the outer shell 23 protrudes toward the handheld body 10 close to the grinding head 40, presenting an acute angle with the direction close to the grinding head 40 and an obtuse angle with the direction away from the grinding head 40, presenting a tree branch-like structure when viewed from a top-down perspective.

[0048] Of course, the above two embodiments are merely two more prominent examples of the present application. For the setting method, other structures may also be adopted. For example, on the basis of the second embodiment, the setting direction of the outer shell 23 is reversed, that is, it is tilted toward the direction close to the first exhaust port 11, which can also be used as an implementation structure. Alternatively, on the basis of the second embodiment, the connection between the outer shell 23 and the second exhaust port 12 is set to a rotatable connection so that the orientation of the outer shell 23 can be changed, which can also achieve the effect of the present application. Finally, in order to facilitate the description of the structure of the present application, the present application will mainly use the first embodiment to explain other structures.

[0049] As a preferred embodiment of the present application, the in-machine purification component 20 further includes a movable exhaust window 24 , and the movable exhaust window 24 is provided with adjustable fan blades 241 .

[0050] Among them, Figure 2 and Figure 5 As shown, the movable exhaust window 24 is detachably connected to the outer shell 23, and an exhaust net parallel to the movable exhaust window 24 is arranged inside. Specifically, the movable exhaust window 24 can be provided with a threaded structure, and one end of the outer shell 23 away from the second exhaust hole is threadedly connected to the outer side of the movable exhaust window 24 to facilitate disassembly and assembly.

[0051] Furthermore, the movable exhaust window 24 also includes an outer frame 243, an inner frame 242 and movable blades, the movable blades are arranged in the inner frame 242, the outer frame 243 coincides with the center of the inner frame 242 and is coplanar, the outer frame 243 surrounds the outer side of the inner frame 242 and the inner frame 242 is rotatably connected to the outer frame 243 to form a detachable structure similar to a hat.

[0052] It can be understood that the exhaust net structure of the movable exhaust window 24 can be set at one end close to the second exhaust port 12, and the exhaust net structure can be fixed on the inner ring body of the outer frame 243, and the threaded structure is set on the outside of the outer ring body to ensure installation and exhaust. The setting of the exhaust net can, on the one hand, play a further shielding effect to block oil, gas and impurities in the air, and on the other hand, it can also achieve a certain noise reduction effect through the structure of the small holes.

[0053] like Figure 5As shown, the outer frame 243 and the inner frame 242 can be set as an annular structure, and the connection is relatively rotated. For the swinging structure of the movable fan blade, a structure similar to a shutter can be used for setting and adjusting to change the exhaust angle.

[0054] In a preferred embodiment, the absorption layer 21 and the filter layer 22 are arranged in parallel to the movable exhaust window 24 , and the two are arranged in sequence along the length direction of the outer shell 23 .

[0055] As for the structure of the absorption layer 21 and the filter layer 22, the absorption layer 21 can be made of silicone material to preliminarily absorb the oil and gas, and the filter layer 22 can be made of a combination of polypropylene (PP) membrane and polytetrafluoroethylene (PTFE) membrane. Since the outer shell 23 can be replaced and cleaned, when selecting the material of the absorption layer 21 and the filter layer 22, low-cost and moderately effective materials can be selected for setting.

[0056] Furthermore, for the detachable structure, the outer shell 23 includes a first purification section 25 and a second purification section 26, both of which are respectively provided with an absorption layer 21 and a filter layer 22, the two ends of the first purification section 25 are respectively connected to the second exhaust port 12 and the second purification section 26, the two ends of the second purification section 26 are respectively connected to the first purification section 25 and the movable exhaust window 24, and the first purification section 25 partially extends into the second exhaust port 12.

[0057] Of course, in order to further improve the filtering effect, a plurality of second purification sections 26 can be provided, but the number should not be too large, so as to avoid making the entire outer shell 23 too long and affecting the normal holding and operation of the handheld pneumatic grinder.

[0058] As a preferred embodiment of the present application, Figure 6 As shown, the external purification component 30 includes a box body 31, a multi-stage filter layer 3222, an air inlet 33 and an air outlet 34, the air inlet 33 can be connected to the first exhaust port 11 and the second exhaust port 12, the air outlet 34 is arranged on the side wall of the box body 31, and the air inlet 33 is arranged on the top of the box body 31 and has an air inlet pipe extending outward.

[0059] It can be understood that since both the second exhaust port 12 and the first exhaust port 11 can perform exhaust work, and the second exhaust port 12 is detachably connected to the in-machine purification component 20, therefore, when performing long-term work or only need to maintain an angle for grinding, the in-machine purification component 20 at the second exhaust port 12 can be removed and connected to the air inlet 33 together with an exhaust port. In other words, the number of air inlets 33 can be multiple. In addition to being able to simultaneously connect to the first exhaust port 11 and the second exhaust port 12 of the same handheld body 10, the multiple air inlets 33 can also be connected to multiple other handheld bodies 10, so that multiple handheld bodies 10 can use one external purification component 30 together, further reducing costs and floor space.

[0060] Furthermore, the multi-stage filter layer 3222 includes a coarse filter layer 32122, an activated carbon layer 322 and a precision filter layer 32322, which are arranged in sequence from top to bottom. Among them, the coarse filter layer 32122 can be a filter made of a metal mesh or fiber material, which is used to remove larger particles of impurities, solid particles and oil and gas condensates, etc. The activated carbon layer is made of activated carbon material as the name suggests, so that the activated carbon can adsorb organic pollutants and odors in the oil and gas to further ensure the cleanliness of the gas. The precision filter layer 32322 can be provided with a multi-stage filter layer composed of multiple layers of materials. The filtering structure, for example, can be arranged in sequence with a fiber filtering structure and a membrane filtering structure. The fiber filtering structure can be made of high-efficiency fiber material, which can remove tiny particles and droplets. The membrane filtering structure can use a polyethersulfone (PES) membrane. The PES membrane has high filtering accuracy and flux, and can achieve a higher filtering effect. Although its cost is relatively high, compared with the internal purification components that need to be replaced frequently, the external purification component 30 can be used longer and needs to discharge clean gas as much as possible. Therefore, the use of a membrane material with a higher filtering effect can better reflect the treatment effect.

[0061] When in use, the user holds the handheld body 10 to perform grinding work, and the external compressor supplies gas into the handheld body 10 through the air supply pipe, and the grinding head 40 is driven to move through the gas flow path, and reaches the first exhaust port 11 and the second exhaust port 12 through the flow path. The in-machine purification component 20 arranged at the second exhaust port 12 can purify the gas discharged from the outside through the handheld body 10, reduce the impact of the exhausted gas on the working environment and the staff, and can be used for cleaning and blowing to clean the surface of the grinded object. The first exhaust port 11 can guide the gas into the external purification component 30, and the external purification component 30 can perform more in-depth cleaning and processing, and finally send the gas out through the air outlet 34.

[0062] Among them, a fan blade structure can be provided at the air outlet 34 to play the role of a hair dryer. When this method is adopted, the entire external purification component 30 can be set under the workbench, and the blowing direction can be staggered away from the workstations of the staff, so as to reduce direct blowing on the staff, while lowering the working environment temperature, the indoor air can be made more circulated, and the gas can be reused while optimizing the working environment.

[0063] Alternatively, a filter structure may be provided at the outer edge of the air outlet 34 to reduce the amount of foreign matter blown out.

[0064] Of course, the air outlet 34 can also be connected to other pipelines to send the air therein to the subsequent deep processing structure to further perform deep processing on the already relatively clean gas, and then it can be discharged to the outside or used in other processes.

[0065] Optionally, the external purification component 30 further includes an air inlet fan and an air outlet fan, which are respectively arranged at the air inlet 33 and the air outlet 34 to assist in the air induction action and improve efficiency.

[0066] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0067] The above is only an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A gas-purifying handheld pneumatic grinder, comprising an internal gas circulation path component and an air intake portion arranged at the rear end of the grinder, characterized in that: The handheld pneumatic grinder includes a handheld body, an in-machine purification component and an out-machine purification component. The air inlet and the first exhaust port are arranged at the rear end of the handheld body, and the second exhaust port is arranged on the side of the handheld body. The in-machine purification component is arranged at the second exhaust port. The in-machine purification component is detachably connected to the second exhaust port. The in-machine purification component includes an absorption layer and a filter layer. The first exhaust port is connected to the out-machine purification component. The out-machine purification component is arranged on the outside of the handheld body and includes multiple filter layers.

2. A gas-purified handheld pneumatic grinder as claimed in claim 1, characterized in that: The in-machine purification component also includes an outer shell, one end of the outer shell is provided with a connection position, and one end of the second exhaust port is provided with a matching position, and the two are threadedly connected.

3. A gas-purified handheld pneumatic grinder as claimed in claim 2, characterized in that: The in-machine purification component also includes a movable exhaust window, and the movable exhaust window is provided with adjustable fan blades.

4. A gas-purified handheld pneumatic grinder as claimed in claim 3, characterized in that: The movable exhaust window is detachably connected to the outer shell, and an exhaust net parallel to the movable exhaust window is arranged inside the movable exhaust window.

5. A gas-purified handheld pneumatic grinder as claimed in claim 4, characterized in that: The movable exhaust window also includes an outer frame, an inner frame and movable blades, the movable blades are arranged on the inner frame, the outer frame coincides with the inner frame center and is coplanar, the outer frame surrounds the outer side of the inner frame and the inner frame is rotatably connected to the outer frame.

6. A gas-purified handheld pneumatic grinder as claimed in claim 5, characterized in that: The absorption layer and the filter layer are arranged in parallel to the movable exhaust window, and the two are arranged in sequence along the length direction of the outer shell.

7. A gas-purified handheld pneumatic grinder as claimed in claim 6, characterized in that: The outer shell includes a first purification section and a second purification section, both of which are respectively provided with an absorption layer and a filtration layer, the two ends of the first purification section are respectively connected to the second exhaust port and the second purification section, the two ends of the second purification section are respectively connected to the first purification section and a movable exhaust window, and the first purification section partially extends into the second exhaust port.

8. A gas-purified handheld pneumatic grinder as claimed in claim 7, characterized in that: The external purification component includes a box body, the multi-stage filter layer, an air inlet and an air outlet, the air inlet is connected to the first exhaust port and / or the second exhaust port, the air outlet is arranged on the side wall of the box body, and the air inlet is arranged on the top of the box body and an air inlet pipe extends outward.

9. A gas-purified handheld pneumatic grinder as claimed in claim 8, characterized in that: The multi-stage filter layer comprises a coarse filter layer, an activated carbon layer and a precision filter layer, which are arranged in sequence from top to bottom.

10. A gas-purified handheld pneumatic grinder as claimed in claim 9, characterized in that: The external purification component also includes an air inlet fan and an air outlet fan, which are respectively arranged at the air inlet and the air outlet.

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