Noise-reduction handheld pneumatic grinding machine

Abstract

A gas flowing path and a pneumatic rotating head are arranged in the noise reduction handheld pneumatic grinding machine, an air inlet and an air outlet are formed in the outer surface of the noise reduction handheld pneumatic grinding machine, the noise reduction handheld pneumatic grinding machine comprises a handheld body and a noise reduction assembly arranged on the handheld body, and the noise reduction assembly comprises an inner noise reduction part and an outer noise reduction part; the outer noise reduction part comprises a first noise reduction shell and a second noise reduction shell, the first noise reduction shell is arranged at the air inlet and the air outlet, and the second noise reduction shell is arranged on the outer surface of the handheld main body; the first noise reduction shell is arranged at the air inlet and the air outlet to reduce vibration noise caused by airflow turbulence during air inlet and air outlet, the second noise reduction shell is arranged on the outer surface of the handheld body, noise generated when air flows in the handheld body can be reduced through the second noise reduction shell, and the noise reduction effect is achieved; and the inner noise reduction part can further improve the internal gas flow and noise reduction capability, so that the noise is further reduced, and the use experience of workers is optimized.

Description

Technical Field

[0001] The present application relates to the technical field of grinding equipment, and in particular to a noise-reducing 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, a pneumatic grinder generally performs grinding work by transporting gas through a pipeline into the interior of the grinder, driving the pneumatic components to rotate, and then driving the grinding head to rotate. When the gas enters the air inlet, flows out of the air outlet, or flows inside, it often causes the inner wall to vibrate and make noise due to fluctuations in the gas source delivery, inconsistent gas flow direction, and internal collisions with the delivery pipeline and the handheld body.

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

[0006] The present application provides a noise-reducing handheld pneumatic grinder to solve the problems in the prior art that the handheld pneumatic grinder makes a lot of noise when in use, it is difficult to eliminate the vibration noise, and this affects the normal use of the staff and the normal working environment.

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

[0008] The present application provides a noise-reducing handheld pneumatic grinder, which is internally provided with a gas flow path and a pneumatic rotating head, and whose outer surface is provided with an air inlet and an air outlet. The handheld pneumatic grinder comprises a handheld main body and a noise reduction component arranged on the handheld main body, the noise reduction component comprises an inner noise reduction part and an outer noise reduction part, the outer noise reduction part comprises a first noise reduction shell and a second noise reduction shell, the first noise reduction shell is arranged at the air inlet and the air outlet, and the second noise reduction shell is arranged on the outer surface of the handheld main body; the inner noise reduction part comprises a noise reduction inner shell and a noise reduction ring group arranged on the inner surface of the air outlet.

[0009] As a preferred embodiment of the present application, the first noise reduction shell includes a wrapping shell and a sound wave reflecting plate arranged in the wrapping shell, the wrapping shell is arranged on the outer wall surface of the air inlet and the air outlet, one end of the sound wave reflecting plate is connected to the inner wall of the wrapping shell, and the other end is provided with a flexible tube, which can be sleeved on the pipelines of the air inlet and the air outlet.

[0010] As a preferred embodiment of the present application, an installation position is provided between the flexible tube and the wrapping shell, a sound wave reflection plate is provided at the installation position, and the sound wave reflection plate has a certain inclination angle with the length direction of the flexible tube.

[0011] As a preferred embodiment of the present application, the second noise reduction shell is a double-layer noise reduction shell, the second noise reduction shell matches the surface structure of the handheld body, and sound insulation cotton is arranged inside the second noise reduction shell.

[0012] As a preferred embodiment of the present application, the second noise reduction shell is detachably connected to the handheld body.

[0013] As a preferred embodiment of the present application, the noise reduction ring group includes a double-layer tube and a guide portion, a cavity is provided inside the double-layer tube, a bridge hole plate is provided inside the cavity, and the guide portion is inclined inward from the air inlet entrance.

[0014] As a preferred embodiment of the present application, two noise reduction ring groups are provided, which are respectively located at the air inlet and the air outlet, and the first noise reduction shell at the noise reduction ring group is also provided with the guide portion.

[0015] As a preferred embodiment of the present application, the bridge hole plate includes two arc-shaped plates arranged opposite to each other, and the inner concave arc surfaces of the arc-shaped plates are arranged opposite to each other to form a cavity.

[0016] As a preferred embodiment of the present application, the noise reduction inner shell is arranged on the inner wall of the handheld body, and the surface of the noise reduction inner shell can be provided with a corrugated surface or a concave-convex surface.

[0017] As a preferred embodiment of the present application, the handheld body includes a power chamber where a pneumatic rotating component is arranged, and the noise reduction component also includes a corrugated shell. The inner wall of the power chamber is a double-layer structure, and the corrugated shell is arranged between the inner wall of the power chamber and the outer wall of the handheld body.

[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 noise-reducing handheld pneumatic grinder, which transforms the interior and exterior of a handheld main body by setting a noise reduction component including an inner noise reduction part and an outer noise reduction part, thereby achieving the effect of noise reduction and vibration reduction, and by setting a first noise reduction shell at the air inlet and the air outlet to reduce the vibration noise caused by air flow turbulence during air intake and outlet, and by setting a second noise reduction shell on the outer surface of the handheld main body, since the gas flows inside the handheld main body, it is inevitable that there will be a collision between the airflow and the inner wall of the handheld main body, and the setting of the second noise reduction shell can reduce the noise generated by the gas flowing inside, thereby achieving the noise reduction effect; in addition, by the inner noise reduction part including a noise reduction inner shell and a noise reduction ring group, the internal gas flow and noise reduction ability can be further improved, thereby further reducing the noise and optimizing the user experience of the staff.

[0020] 2. As a preferred embodiment of the present application, by providing a wrapping shell and a sound wave reflection plate, the structure of the wrapping shell can wrap the outer wall ribs of the air outlet and the air inlet, thereby improving the effect of sealing and surrounding the pipelines of the air inlet and the air outlet, thereby reducing the noise generated by the gas flow vibrating the pipeline, and the flexible deformation effect of the flexible pipe can further play a buffering effect, and the setting of the sound wave reflection plate can make the sound waves propagating outward from the air inlet and the air outlet reflect during the propagation process, reducing the amount of sound waves that directly penetrate the pipe wall. This can further reduce the propagation of noise.

[0021] 3. As a preferred embodiment of the present application, the present application adopts a double-layer noise reduction shell by setting a second noise reduction shell. On the one hand, it can increase the thickness of the handheld body plus the structure of the second noise reduction shell, thereby improving the noise reduction ability to a certain extent. On the other hand, by setting a double-layer noise reduction shell, sound insulation cotton can be set inside it, thereby further achieving the effect of noise reduction and shock reduction, and reducing the vibration generated during use. In addition, by setting a detachable connection between the noise reduction shell and the handheld body, it can not only adapt to different situations to disassemble and assemble the second noise reduction shell, but also facilitate user use.

[0022] 4. As a preferred embodiment of the present application, the present application arranges a noise reduction ring group including a double-layer tube and a guide part, and arranges a bridge hole plate in the cavity of the double-layer tube. On the one hand, it can improve the anti-vibration effect of the noise reduction ring group, reduce the secondary vibration caused by gas flow and noise resonance, and reduce the generation of noise; on the other hand, the hollow structure of the bridge hole plate can make the noise pass through the entity first, then through the air, and finally through the entity, thereby improving the noise reduction effect by allowing the noise to pass through different spaces and materials; in addition, the setting of the guide part can limit and guide the flow path of the gas to a certain extent, reduce the phenomenon of gas randomly colliding in the pipeline and the gas flow path, thereby reducing the collision of the gas with the inner wall and reducing the occurrence of noise. 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 noise-reducing handheld pneumatic grinder provided in this application;

[0025] Figure 2 A schematic structural diagram of a first noise reduction shell of a noise reduction handheld pneumatic grinder provided in the present application;

[0026] Figure 3 This is a schematic structural diagram of a noise reduction ring group at the air inlet of a noise-reducing handheld pneumatic grinder provided in the present application.

[0027] Reference numerals:

[0028] 10. Pneumatic rotating head;

[0029] 20 air inlet;

[0030] 30 air outlet;

[0031] 40 inner noise reduction part; 41 noise reduction inner shell; 42 noise reduction ring group; 421 double-layer pipe; 422 guide part; 423 bridge hole plate;

[0032] 50 external noise reduction part; 51 first noise reduction shell; 511 wrapping shell; 512 sound wave reflection plate; 513 flexible tube; 52 second noise reduction shell; 521 sound insulation cotton. DETAILED DESCRIPTION

[0033] 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.

[0034] 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.

[0035] 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.

[0036] 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.

[0037] 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.

[0038] like Figures 1 to 3 As shown, the present application provides a noise-reducing handheld pneumatic grinder, which is internally provided with a gas flow path and a pneumatic rotating head 10, and its outer surface is provided with an air inlet 20 and an air outlet 30. The handheld pneumatic grinder includes a handheld body and a noise reduction component arranged on the handheld body, the noise reduction component includes an inner noise reduction part 40 and an outer noise reduction part 50, the outer noise reduction part 50 includes a first noise reduction shell 51 and a second noise reduction shell 52, the first noise reduction shell 51 is arranged at the air inlet 20 and the air outlet 30, and the second noise reduction shell 52 is arranged on the outer surface of the handheld body; the inner noise reduction part 40 includes a noise reduction inner shell 41 and a noise reduction ring group 42 arranged on the inner surface of the air outlet 30.

[0039] Among them, Figure 1 As shown, the handheld pneumatic grinder adopts a similar structure to CN210388840U, and the first noise reduction shell 51 and the second noise reduction shell 52 are respectively arranged on the external structure of the air inlet 20 and the air outlet 30, and wrap the outer edge parts of the air inlet 20 and the air outlet 30.

[0040] Furthermore, the first noise reduction shell 51 includes a wrapping shell 511 and a sound wave reflecting plate 512 arranged in the wrapping shell 511. The wrapping shell 511 is arranged on the outer wall surface of the air inlet 20 and the air outlet 30. One end of the sound wave reflecting plate 512 is connected to the inner wall of the wrapping shell 511, and the other end is provided with a flexible tube 513. The flexible tube 513 can be sleeved on the pipelines of the air inlet 20 and the air outlet 30.

[0041] As for the sound wave reflection plate 512, the sound wave reflection plate 512 is set between the double-layer structure in order to more effectively manage and control the propagation of sound waves, so as to achieve the effect of noise reduction. As for the setting angle of the sound wave reflection plate 512, the setting angle of the sound wave reflection plate 512 mainly depends on the acoustic effect to be achieved. For example, if you want to reflect the sound wave to a specific direction, you can determine the inclination angle of the reflection plate according to the incident angle of the sound wave and the required reflection direction. For example, in the path, the general direction of the gas flow is horizontal movement toward the front. For the horizontally transported airflow, the sound wave reflection plate 512 is preferably set perpendicular to the axis of the pipeline. In this way, it can be ensured that when the sound wave encounters the sound wave reflection plate 512 during the propagation process, it can be reflected back to the inside of the pipeline to the maximum extent, reducing the chance of the sound wave penetrating the double-layer structure.

[0042] That is, the sound wave reflecting plate 512 should be as perpendicular as possible to the main propagation direction of the sound wave to ensure the maximum reflection effect. However, in some cases, it may be necessary to tilt the reflecting plate at a certain angle to guide the sound wave to a specific area or avoid an unwanted area.

[0043] Furthermore, if Figure 2 As shown, the structure of the first noise reduction shell 51 can be set according to the shell structure of the adapted pneumatic hand-held grinder, for example, Figure 1 As shown, the structure of the first noise reduction shell 51 arranged at the air inlet 20 can be a columnar wrapping structure, which wraps the air inlet 20 and can provide a space for accommodating the connected pipes. Of course, the air outlet 30 also has a similar structure.

[0044] In addition, the structure of the flexible tube 513 can be located inside the first noise reduction shell 51, that is, the first noise reduction shell 51 is a structure similar to the double-layer tube 421. The first noise reduction shell 51 wraps the flexible tube 513, and a sound wave reflection plate 512 is arranged between the two to further improve the noise reduction effect. Of course, the setting of the flexible tube 513 needs to ensure that it is as compatible as possible with the movement and folding of the connecting pipes of the air inlet 20 and the air outlet 30, while also ensuring sealing and sufficient thickness to achieve sound insulation effect and reliability of use.

[0045] In addition, an installation position is set between the flexible tube 513 and the wrapping shell 511, and the sound wave reflecting plate 512 is set at the installation position. The sound wave reflecting plate 512 and the length direction of the flexible tube 513 have a certain inclination angle, and this inclination angle can be adjusted according to actual conditions.

[0046] Of course, the structure of the first noise reduction shell 51 can adopt a similar structure when it is at the air inlet 20 and the air outlet 30, and can be adjusted and processed in real time according to different handheld pneumatic grinders and the structures of the air inlet 20 and the air outlet 30.

[0047] As a preferred implementation of the present application, Figure 1 As shown, the second noise reduction shell 52 is a double-layer noise reduction shell. The second noise reduction shell 52 matches the surface structure of the handheld body. Sound insulation cotton 521 is arranged inside the second noise reduction shell 52.

[0048] It is understandable that since the second noise reduction shell 52 needs to be attached to the outer shell of the handheld pneumatic grinder, the shape and structure of the second noise reduction shell 52 are not specifically limited, and its outer shell structure needs to be compatible with the outer shell of the second noise reduction shell 52.

[0049] For the double-layer structure, since the handheld pneumatic grinder needs to be held by the staff, its structure can be set to have a certain noise reduction effect at the part that needs to be held, while also ensuring a certain appropriate thickness to facilitate the user's holding. For the part that the user does not need to hold, it can be set to a thicker wall shell. Since the part that does not need to be held is generally the part where the pneumatic shaft is set, the noise and vibration here are relatively large, so setting it thicker can also provide better noise reduction effect.

[0050] Furthermore, the second noise reduction shell 52 is detachably connected to the handheld body. It can be understood that the detachable structure can be connected by threaded connection. For example, a protruding threaded hole is provided on the outer edge of the second noise reduction shell 52, and the side wall of the handheld body is provided with the same threaded hole, which is fixed by a threaded connection of a screw. Alternatively, a slide is provided on the side wall of the handheld body, and a slider is provided on the inner wall of the second noise reduction shell 52. The slider and the slide are slidably assembled to facilitate assembly and disassembly.

[0051] In another preferred embodiment, the noise reduction ring assembly 42 includes a double-layer tube 421 and a guide portion 422 . A cavity is provided inside the double-layer tube 421 . A bridge hole plate 423 is provided inside the cavity. The guide portion 422 is inclined inward from the entrance of the air inlet 20 .

[0052] Among them, Figure 3 As shown, the structure of the double-layer tube 421 serves as the external main structure, which can adopt a cylindrical tubular structure, and its outer wall can be assembled on the inner wall of the air inlet 20 or the air outlet 30. That is to say, the thickness of the double-layer tube 421 should be set to a thinner structure to facilitate internal assembly.

[0053] As a preferred embodiment of the present application, two noise reduction ring sets 42 are provided, which are respectively located at the air inlet 20 and the air outlet 30 , and the first noise reduction shell 51 at the air outlet 30 is also provided with the guide portion 422 .

[0054] That is to say, similar to the first noise reduction shell 51, the noise reduction ring group 42 arranged at the air inlet 20 and the air outlet 30 should also be adaptively changed to adapt to the structures of the air inlet 20 and the air outlet 30. For the guide portion 422, it can be on the inner wall of the double-layer tube 421, and at the air inlet 20 it can present a structure that is inclined toward the inner center, with a larger outside and a smaller inside, and at the air outlet 30 it can present a structure that is inclined toward the inner side wall, with a smaller outside and a larger inside, so that the flow path of the gas can move concentratedly along the inclined direction.

[0055] Furthermore, with regard to the structure of the bridge hole plate 423 , the bridge hole plate 423 includes two arc-shaped plates that are arranged opposite to each other, and the inner concave arc surfaces of the arc-shaped plates are arranged opposite to each other to form a cavity.

[0056] It can be understood that by arranging a bridge hole plate 423 in the cavity of the double-layer tube 421, on the one hand, the anti-vibration effect of the noise reduction ring group 42 can be improved, the secondary vibration caused by gas flow and noise resonance can be reduced, and the generation of noise can be reduced; on the other hand, the hollow structure of the bridge hole plate 423 can allow the noise to pass through the entity first, then through the air, and finally through the entity, thereby improving the noise reduction effect by allowing the noise to pass through different spaces and materials.

[0057] Furthermore, the noise reduction inner shell 41 is arranged on the inner wall of the handheld body, and the surface of the noise reduction inner shell 41 can be provided with a corrugated surface or a concave-convex surface. The effects of the concave-convex surface and the corrugations are similar to those of the sound wave reflecting plate 512. These structures can change the propagation direction of the sound waves, causing the sound waves to be reflected, diffused or interfered inside the pipeline, thereby reducing the amount of sound waves directly propagating to the outside.

[0058] In a preferred embodiment, the handheld body includes a power chamber where a pneumatic rotating component is disposed, and the noise reduction component also includes a corrugated shell. The inner wall of the power chamber is a double-layer structure, and the corrugated shell is disposed between the inner wall of the power chamber and the outer wall of the handheld body.

[0059] It can be understood that the corrugated shell structure referred to here should be a semi-shell structure, that is, it does not fully surround the structure of the power chamber, so as to reduce the impact on the gas flow. The structural effect of the corrugated shell is similar to that of the reflector, which reflects noise and reduces noise.

[0060] 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.

[0061] 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 noise-reducing handheld pneumatic grinder, which has a gas flow path and a pneumatic rotating head arranged inside, and an air inlet and an air outlet arranged on its outer surface, characterized in that: The handheld pneumatic grinder includes a handheld body and a noise reduction component arranged on the handheld body, the noise reduction component includes an inner noise reduction part and an outer noise reduction part, the outer noise reduction part includes a first noise reduction shell and a second noise reduction shell, the first noise reduction shell is arranged at the air inlet and the air outlet, and the second noise reduction shell is arranged on the outer surface of the handheld body; the inner noise reduction part includes a noise reduction inner shell and a noise reduction ring group arranged on the inner surface of the air outlet.

2. A noise-reducing handheld pneumatic grinder as claimed in claim 1, characterized in that: The first noise reduction shell includes a wrapping shell and a sound wave reflecting plate arranged in the wrapping shell, the wrapping shell is arranged on the outer wall surface of the air inlet and the air outlet, one end of the sound wave reflecting plate is connected to the inner wall of the wrapping shell, and the other end is provided with a flexible tube, and the flexible tube can be sleeved on the pipelines of the air inlet and the air outlet.

3. A noise-reducing handheld pneumatic grinder as claimed in claim 2, characterized in that: An installation position is arranged between the flexible tube and the wrapping shell, the sound wave reflection plate is arranged at the installation position, and the sound wave reflection plate has a certain inclination angle with the length direction of the flexible tube.

4. A noise-reducing handheld pneumatic grinder as claimed in claim 3, characterized in that: The second noise reduction shell is a double-layer noise reduction shell, the second noise reduction shell matches the surface structure of the handheld body, and sound insulation cotton is arranged inside the second noise reduction shell.

5. A noise-reducing handheld pneumatic grinder as claimed in claim 4, characterized in that: The second noise reduction shell is detachably connected to the handheld body.

6. A noise-reducing handheld pneumatic grinder as claimed in claim 1, characterized in that: The noise reduction ring assembly comprises a double-layer tube and a guide portion, a cavity is provided inside the double-layer tube, a bridge hole plate is provided inside the cavity, and the guide portion is inclined inwardly from the air inlet entrance.

7. A noise-reducing handheld pneumatic grinder as claimed in claim 6, characterized in that: The noise reduction ring groups are provided with two, which are respectively located at the air inlet and the air outlet, and the noise reduction ring groups at the air outlet are also provided with the guide part.

8. A noise-reducing handheld pneumatic grinder as claimed in claim 7, characterized in that: The bridge hole plate comprises two arc-shaped plates arranged opposite to each other, and the inner concave arc surfaces of the arc-shaped plates are arranged opposite to each other to form a cavity.

9. The noise-reducing handheld pneumatic grinder according to claim 6, characterized in that: The noise reduction inner shell is arranged on the inner wall of the handheld body, and the surface of the noise reduction inner shell may be provided with a corrugated surface or a concave-convex surface.

10. The noise-reducing handheld pneumatic grinder according to claim 1, characterized in that: The handheld body includes a power chamber where a pneumatic rotating component is arranged, and the noise reduction component also includes a corrugated shell. The inner wall of the power chamber is a double-layer structure, and the corrugated shell is arranged between the inner wall of the power chamber and the outer wall of the handheld body.

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