Plasma powder removal structure and coffee grinder

Abstract

This disclosure provides a plasma dust removal structure and a coffee grinder. The plasma dust removal structure is installed at the dust outlet of the coffee grinder and includes a plasma emitter and a protective cover. The plasma emitter is mounted and fixed to the bottom of the coffee grinder, with its plasma emitting end facing the grinding blade at the dust outlet. The protective cover is installed and placed on the bottom of the grinding blade, positioned between the plasma emitting end of the plasma emitter and the grinding blade, protecting the grinding blade. This plasma dust removal structure not only improves the service life of the coffee grinder but also reduces its maintenance costs.

Description

Technical Field

[0001] This disclosure relates to the technical field of coffee grinders, and in particular to a plasma powder removal structure and a coffee grinder. Background Technology

[0002] Most coffee grinders on the market rely on grinding dry coffee beans into coffee powder. During high-speed grinding, the dry coffee beans generate static electricity as they break and rub against each other. This results in the coffee powder at the outlet carrying a high static charge, making it easy for the coffee powder to adhere to the grinding blades and even clog the outlet, thus greatly reducing the user experience.

[0003] To address the aforementioned issues, some manufacturers have conducted further research and development. For example, existing technology patent CN217365512U includes a grinder stand, a grinding mechanism, a dust removal plate, and a plasma generator. The grinder stand has a grinding chamber with a dust outlet channel at its bottom connecting the chamber to the outside. The grinding mechanism and dust removal plate are located within the grinding chamber, with the dust removal plate rotatably positioned below the grinding mechanism and corresponding to the dust outlet channel. The plasma generator includes electrodes located within the dust outlet channel. This aforementioned anti-static, anti-dust-spraying grinding device and coffee grinder generates a high-voltage electrostatic field at the dust outlet channel using the plasma generator. This effectively eliminates the static charge carried by the coffee powder exiting the outlet channel after grinding, preventing coffee powder from adhering to the grinding blades or even clogging the outlet channel, thus significantly improving the user experience.

[0004] However, most coffee grinders currently use metal blades. When the plasma generator emits plasma towards the blades, the particles and electrons in the plasma continuously bombard the surface of the blades. This causes a large number of particles and electrons to accumulate on the surface of the blades, greatly increasing the heat load and ion bombardment effect. This not only causes the surface temperature of the blades to rise sharply, easily leading to overheating and charring of the coffee powder, affecting the flavor of the coffee powder and greatly reducing the user experience, but also accelerates the oxidation and wear of the coffee grinder blades due to continuous ion bombardment. This not only significantly shortens the lifespan of the coffee grinder but also greatly increases its maintenance costs. Utility Model Content

[0005] The purpose of this disclosure is to overcome the shortcomings of the prior art and provide a plasma powder removal structure and coffee grinder that not only improves service life but also has lower maintenance costs.

[0006] The purpose of this disclosure is achieved through the following technical solution:

[0007] A plasma powder removal structure is used to be installed at the powder outlet of a coffee grinder. The plasma powder removal structure includes a plasma emitter and a protective cover.

[0008] The plasma emitter is used to be installed and fixed to the bottom of the coffee grinder. The plasma emitting end of the plasma emitter is set towards the grinding blade at the powder outlet. The protective cover is used to cover the bottom of the grinding blade and is located between the plasma emitting end of the plasma emitter and the grinding blade. The protective cover is used to protect the grinding blade.

[0009] In one embodiment, the protective cover is detachably mounted to the grinding blade.

[0010] In one embodiment, the plasma dust removal structure further includes a fastener, and the protective cover plate is also formed with a positioning hole for being disposed opposite to the threaded hole at the bottom of the grinding blade. The fastener passes through the positioning hole and is used for threaded connection with the threaded hole.

[0011] In one embodiment, the outer peripheral wall of the protective cover is further provided with a powder sweeping flange, which is configured to be opposite to the powder outlet.

[0012] In one embodiment, there are multiple powder-sweeping flanges, and the multiple powder-sweeping flanges are evenly spaced along the outer peripheral wall of the protective cover.

[0013] In one embodiment, an annular flange protrudes from the outer periphery of the threaded hole, the annular flange surrounds the threaded hole, and the annular flange protrudes from one side of the protective cover plate adjacent to the plasma emitter, so as to jointly form a receiving and protective groove communicating with the positioning hole, the receiving and protective groove being used to receive and protect the fastener.

[0014] In one embodiment, the protective cover has a snap-fit ​​flange protruding from one side away from the plasma emitter, the snap-fit ​​flange being configured to be opposite to the snap-fit ​​groove at the bottom of the grinding blade.

[0015] In one embodiment, the protective cover plate is further provided with reinforcing ribs.

[0016] In one embodiment, the protective cover is a polytetrafluoroethylene cover, an alumina ceramic cover, or a perylene cover.

[0017] A coffee grinder includes a grinding blade and a plasma emitter as described in any of the above embodiments. The plasma emitter is fixedly mounted on the bottom of the coffee grinder, with the plasma emitting end of the plasma emitter facing the grinding blade at the powder outlet. A protective cover is mounted on the bottom of the grinding blade and is positioned between the plasma emitting end of the plasma emitter and the grinding blade.

[0018] In one embodiment, a side-mounted transmission assembly is fixed to the side of the coffee grinder, and the power output end of the side-mounted transmission assembly is used for transmission connection with the power input end of the grinding blade.

[0019] In one embodiment, the side-mounted transmission assembly includes a drive motor, a drive gear, and a driven gear. The fixed end of the side-mounted transmission assembly is disposed on the drive motor, which is mounted and fixed to the side of the coffee grinder. The drive gear is sleeved on the power input end of the drive motor, and the driven gear is sleeved on the power input end of the grinding blade. The drive gear and the driven gear are connected in a transmission manner.

[0020] In one embodiment, the side-mounted transmission assembly further includes a transmission gear rotatably connected to the coffee grinder, and the transmission gear meshes with the driving gear and the driven gear respectively.

[0021] In one embodiment, the side-mounted transmission assembly further includes a transmission protection cover, which has a transmission protection groove for accommodating and protecting the power output end of the side-mounted transmission assembly and the power input end of the grinding blade.

[0022] Compared with the prior art, this disclosure includes, but is not limited to, the following advantages:

[0023] 1. The plasma powder removal structure described above, with the plasma emitter installed and fixed at the bottom of the coffee grinder, and the plasma emitting end of the plasma emitter facing the grinding blade at the powder outlet, allows the plasma emitter to generate a high-voltage electrostatic field at the powder outlet of the coffee grinder. This effectively eliminates the static charge carried by the coffee powder adhering to the grinding blade and the coffee powder exiting from the powder outlet after grinding, effectively preventing the coffee powder from adhering to the grinding blade or even clogging the powder outlet. This allows the coffee grinder to dispense powder smoothly, thereby greatly improving the user experience of the coffee grinder.

[0024] 2. The protective cover is installed on the bottom of the grinding blade and positioned between the plasma emission end of the plasma emitter and the grinding blade. The cover protects the grinding blade so that when the plasma emitter emits plasma towards it, the cover effectively reduces the continuous bombardment of particles and electrons from the plasma, preventing a large accumulation of particles and electrons on the blade surface. This significantly reduces the heat load and ion bombardment effect on the grinding blade, preventing overheating and charring of coffee powder due to the increased surface temperature of the grinding blade. It also greatly slows down oxidation and wear of the grinding blade, thus significantly extending the lifespan of the coffee grinder and reducing maintenance costs. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings used in the embodiments will be briefly described below. It should be understood that the following drawings only show some embodiments of this disclosure and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a coffee grinder according to one embodiment;

[0027] Figure 2 for Figure 1 A partial structural diagram of a coffee grinder is shown;

[0028] Figure 3 for Figure 1 Another partial structural diagram of the coffee grinder shown;

[0029] Figure 4 for Figure 3 The diagram shows another perspective.

[0030] Figure 5 for Figure 1 Another partial structural diagram of the coffee grinder shown;

[0031] Figure 6 for Figure 1 Another partial structural diagram of the coffee grinder shown;

[0032] Figure 7 This is a schematic diagram of the structural model of a coffee grinder. Detailed Implementation

[0033] To facilitate understanding of this disclosure, a more complete description will be given below with reference to the accompanying drawings, which illustrate preferred embodiments of the present disclosure. However, this disclosure can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of the disclosure.

[0034] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly attached to the other element or there may be an intervening element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this disclosure belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this disclosure. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] To better understand the technical solutions and beneficial effects of this disclosure, the following detailed description is provided in conjunction with specific embodiments:

[0037] like Figures 1 to 7 As shown, in one embodiment, a plasma powder removal structure 100 is installed at the powder outlet 300 of a coffee grinder 10. The plasma powder removal structure 100 includes a plasma emitter 110 and a protective cover 120. The plasma emitter 110 is installed and fixed at the powder outlet 300. The plasma emitting end of the plasma emitter 110 is positioned towards the grinding blade 200 at the powder outlet 300, so that the plasma emitter 110 generates a high-voltage electrostatic field at the powder outlet 300. This effectively eliminates the static charge carried by coffee powder adhering to the grinding blade 200 and by coffee powder exiting from the powder outlet 300 after grinding. This effectively prevents coffee powder from adsorbing on the grinding blade 200 or even clogging the powder outlet 300, allowing the coffee grinder 10 to dispense powder smoothly, thereby greatly improving the user experience of the coffee grinder 10.

[0038] like Figures 1 to 7As shown, the protective cover 120 is further installed on the bottom of the grinding blade 200 and is positioned between the plasma emission end of the plasma emitter 110 and the grinding blade 200. The protective cover 120 protects the grinding blade 200 so that when the emission end of the plasma emitter 110 emits plasma toward the grinding blade 200, the protective cover 120 can effectively reduce the continuous bombardment of the grinding blade 200 by particles and electrons in the plasma, avoiding the phenomenon of a large number of particles and electrons accumulating on the surface of the grinding blade 200. This greatly reduces the heat load and ion bombardment effect of the grinding blade 200, not only preventing the coffee powder from overheating and charring due to the surface temperature rise of the grinding blade 200, but also greatly slowing down the oxidation and wear of the grinding blade 200, thereby greatly improving the service life of the coffee grinder 10 and greatly reducing the maintenance cost of the coffee grinder 10.

[0039] The aforementioned plasma powder removal structure 100, with the plasma emitter 110 installed and fixed to the bottom of the coffee grinder 10, has its plasma emitting end facing the grinding blade 200 at the powder outlet 300. This allows the plasma emitter 110 to generate a high-voltage electrostatic field at the powder outlet 300 of the coffee grinder 10, effectively eliminating the static charge carried by coffee powder adhering to the grinding blade 200 and by coffee powder exiting from the powder outlet 300 after grinding. This effectively prevents coffee powder from adhering to the grinding blade 200 or even clogging the powder outlet 300, allowing the coffee grinder 10 to dispense powder smoothly, thereby greatly improving the user experience of the coffee grinder 10.

[0040] Furthermore, since the protective cover 120 is used to install and cover the bottom of the grinding blade 200, and the protective cover 120 is used to be positioned between the plasma emission end of the plasma emitter 110 and the grinding blade 200, the protective cover 120 is used to protect the grinding blade 200. When the emission end of the plasma emitter 110 emits plasma toward the grinding blade 200, the protective cover 120 can effectively reduce the continuous bombardment of the grinding blade 200 by particles and electrons in the plasma, and avoid the phenomenon of a large number of particles and electrons accumulating on the surface of the grinding blade 200. This greatly reduces the heat load and ion bombardment effect of the grinding blade 200, not only preventing the coffee powder from overheating and charring due to the accumulation and rise of the surface temperature of the grinding blade 200, but also greatly slowing down the oxidation and wear of the grinding blade 200, thereby greatly improving the service life of the coffee grinder 10, and also greatly reducing the maintenance cost of the coffee grinder 10.

[0041] It should be noted that the specific structure and working principle of the plasma emitter 110 are existing technologies, and the technical principle of generating thermal load and ion bombardment effect between metal and plasma is also existing technology, which will not be elaborated here.

[0042] like Figures 1 to 2 As shown, in one embodiment, the protective cover 120 is detachably mounted to the grinding blade 200 to facilitate the installation and removal of the protective cover 120, thereby greatly reducing the maintenance and replacement cost of the protective cover 120.

[0043] like Figures 1 to 3 As shown, in one embodiment, the plasma powder removal structure 100 also includes fasteners (not shown). The protective cover 120 also has a positioning hole 121 for being disposed opposite to the threaded hole 210 at the bottom of the grinding blade 200. The fastener passes through the positioning hole 121 and is used to be threadedly connected to the threaded hole 210, so that the protective cover 120 can be securely fixed to the bottom of the grinding blade 200 by the fastener, avoiding the phenomenon of the grinding blade 200 shaking or even falling off when rotating relative to the coffee grinder 10, thereby greatly improving the stability of the coffee grinder 10 in use, and also greatly reducing the difficulty of installing and disassembling the protective cover 120, thereby greatly reducing the difficulty of maintenance and replacement of the coffee grinder 10.

[0044] In one embodiment, the fastener is a screw or bolt.

[0045] like Figures 1 to 4 As shown, in one embodiment, the outer peripheral wall of the protective cover 120 is also provided with a dust-sweeping flange 122. The dust-sweeping flange 122 is arranged opposite to the dust outlet 300 so that the dust-sweeping flange 122 can sweep the coffee powder accumulated at the dust outlet 300, effectively preventing the dust outlet 300 of the coffee grinder 10 from becoming clogged due to excessive coffee powder accumulation, so that the dust outlet 300 of the coffee grinder 10 can smoothly dispense coffee powder, thereby greatly improving the user experience.

[0046] like Figures 1 to 4 As shown, in one embodiment, there are multiple powder-sweeping flanges 122, and the multiple powder-sweeping flanges 122 are evenly spaced along the outer peripheral wall of the protective cover plate 120 to further improve the powder-sweeping effect of the powder-sweeping flanges 122 and avoid the phenomenon of blockage in the powder outlet 300 of the coffee grinder 10 due to excessive accumulation of coffee powder.

[0047] Understandably, most fasteners on the market are made of metal screws or metal bolts. When a plasma generator emits plasma toward a fastener, the particles and electrons in the plasma continuously bombard the surface of the fastener, causing a large number of particles and electrons to accumulate on the surface of the fastener. This leads to a significant increase in the thermal load and ion bombardment effect of the fastener, which not only causes the surface temperature of the fastener to rise sharply, but also accelerates the oxidation and wear of the fastener, thereby greatly reducing the service life of the fastener and significantly increasing the maintenance cost of the fastener.

[0048] like Figure 3 As shown, in one embodiment, an annular flange 123 protrudes from the outer periphery of the threaded hole 210. The annular flange 123 surrounds the threaded hole 210 and protrudes from one side of the protective cover plate 120 adjacent to the plasma emitter 110, so as to jointly form a receiving protective groove 124 communicating with the positioning hole 121. The receiving protective groove 124 is used to receive the protective fastener, so that when the emitting end of the plasma emitter 110 emits plasma toward the fastener, the annular flange 123 can effectively reduce the continuous bombardment of particles and electrons in the plasma on the fastener, avoid the phenomenon of a large number of particles and electrons accumulating on the surface of the fastener, and greatly reduce the thermal load and ion bombardment effect of the fastener, thereby greatly slowing down the oxidation and wear of the fastener, improving the service life and locking stability of the fastener, so that the fastener can securely fix the protective cover plate 120 to the grinding knife 200.

[0049] like Figure 2 and Figure 4 As shown, in one embodiment, the protective cover 120 has a snap-fit ​​flange 125 protruding on one side away from the plasma emitter 110. The snap-fit ​​flange 125 is arranged opposite to the snap-fit ​​groove 220 at the bottom of the grinder 200, so that the grinder 200 can more stably drive the protective cover 120 to rotate relative to the coffee grinder 10. This allows the dust-sweeping flange 122 to better sweep away the coffee powder accumulated at the coffee grinder 10's outlet 300, effectively preventing the coffee grinder 10's outlet 300 from becoming clogged due to excessive coffee powder accumulation. This ensures that the coffee grinder 10's outlet 300 can smoothly dispense coffee powder, thereby greatly improving the user experience.

[0050] like Figure 4 As shown, in one embodiment, the protective cover 120 is further provided with reinforcing ribs 126 to improve the structural strength of the protective cover 120 and thereby improve the service life of the protective cover 120.

[0051] like Figure 4As shown, in one embodiment, the protective cover 120 is a polytetrafluoroethylene cover, an alumina ceramic cover, or a terephthalic acid cover, so that the protective cover 120 has high structural strength and good plasma absorption effect. This allows the protective cover 120 to absorb the plasma emitted by the plasma emitter 110, effectively reducing the continuous bombardment of the grinding blade 200 by the plasma, and avoiding the phenomenon of a large number of particles and electrons accumulating on the surface of the grinding blade 200. This greatly reduces the heat load and ion bombardment effect of the grinding blade 200, not only preventing the coffee powder from overheating and charring due to the surface temperature rise of the grinding blade 200, but also greatly slowing down the oxidation and wear of the grinding blade 200, thereby greatly improving the service life of the grinding blade 200 and greatly reducing the maintenance cost of the grinding blade 200.

[0052] This disclosure also provides a coffee grinder 10, including a grinding blade 200 and a plasma emitter 110 as described in any of the above embodiments. The plasma emitter 110 is installed and fixed at the powder outlet 300, with the plasma emitting end of the plasma emitter 110 facing the grinding blade 200 at the powder outlet 300. A protective cover 120 is installed and covers the bottom of the grinding blade 200, and the protective cover 120 is disposed between the plasma emitting end of the plasma emitter 110 and the grinding blade 200.

[0053] like Figure 5 As shown, in one embodiment, a side-mounted transmission assembly 400 is fixed to the side of the coffee grinder 10. The power output end of the side-mounted transmission assembly 400 is used to drive the power input end of the grinding blade 200 so that the side-mounted transmission assembly 400 can drive the grinding blade 200 to rotate relative to the coffee grinder 10, so that the grinding blade 200 can grind the coffee beans in the coffee grinder 10. At the same time, the side-mounted transmission assembly 400 can also reduce the overall height of the coffee grinder 10 by being set on the side of the coffee grinder 10, so that the coffee grinder 10 can be used in more scenarios, thereby greatly improving the applicability of the coffee grinder 10.

[0054] like Figure 5As shown, in one embodiment, the side-mounted transmission assembly 400 includes a drive motor 410, a drive gear 420, and a driven gear 230. The fixed end of the side-mounted transmission assembly 400 is disposed on the drive motor 410, which is mounted and fixed to the side of the coffee grinder 10. The drive gear 420 is sleeved on the power input end of the drive motor 410, and the driven gear 230 is sleeved on the power input end of the grinding blade 200. The drive gear 420 and the driven gear 230 are connected in a transmission connection so that when the drive motor 410 drives the drive gear 420 to rotate relative to the coffee grinder 10, the drive gear 420 can drive the driven gear 230 to rotate, thereby driving the grinding blade 200 to rotate relative to the coffee grinder 10, and thus grinding the coffee beans in the coffee grinder 10.

[0055] like Figure 5 As shown, in one embodiment, the side-mounted transmission assembly 400 further includes a transmission gear 430, which is rotatably connected to the coffee grinder 10. The transmission gear 430 is meshed with the drive gear 420 and the driven gear 230 respectively, so that the drive gear 420 can drive the driven gear 230 to rotate relative to the coffee grinder 10 through the transmission gear 430, so that the driven gear 230 can drive the grinding blade 200 to rotate relative to the coffee grinder 10, thereby grinding the coffee beans in the coffee grinder 10.

[0056] like Figure 5 As shown, in one embodiment, the transmission gear 430 can also be a reduction gear, which reduces the rotational speed of the grinding blade 200 and increases the output torque to match the grinding resistance requirements of coffee beans, thereby improving the grinding uniformity and grinding efficiency of the coffee grinder 10.

[0057] like Figure 6 As shown, in one embodiment, the side-mounted transmission assembly 400 further includes a transmission protection cover 500, which is installed and fixed to the coffee grinder 10. The transmission protection cover 500 forms a transmission protection groove 510, which is used to accommodate and protect the power output end of the side-mounted transmission assembly 400 and the power input end of the grinding blade 200, so as to prevent the coffee grinder 10 from jamming or even getting stuck due to the intrusion of foreign objects into the power output end of the side-mounted transmission assembly 400 and the power input end of the grinding blade 200, thus ensuring that the coffee grinder can operate stably and normally, thereby greatly improving the stability of the coffee grinder 10.

[0058] Compared with the prior art, this disclosure includes, but is not limited to, the following advantages:

[0059] 1. In the coffee grinder 10 described above, the plasma emitter 110 is installed and fixed at the bottom of the coffee grinder 10. The plasma emitting end of the plasma emitter 110 is set to face the grinding blade 200 at the powder outlet 300, so that the plasma emitter 110 can generate a high voltage electrostatic field at the powder outlet 300 of the coffee grinder 10. This can effectively eliminate the static charge carried by the coffee powder attached to the grinding blade 200 and the coffee powder coming out of the powder outlet 300 after grinding. This effectively avoids the phenomenon of coffee powder adsorbing on the grinding blade 200 or even clogging the powder outlet 300, so that the coffee grinder 10 can dispense powder smoothly, thereby greatly improving the user experience of the coffee grinder 10.

[0060] 2. Since the protective cover 120 is used to install and cover the bottom of the grinding blade 200, and the protective cover 120 is used to be positioned between the plasma emission end of the plasma emitter 110 and the grinding blade 200, the protective cover 120 is used to protect the grinding blade 200. When the emission end of the plasma emitter 110 emits plasma towards the grinding blade 200, the protective cover 120 can effectively reduce the continuous bombardment of the grinding blade 200 by particles and electrons in the plasma, and avoid the phenomenon of a large number of particles and electrons accumulating on the surface of the grinding blade 200. This greatly reduces the heat load and ion bombardment effect of the grinding blade 200, not only preventing the coffee powder from overheating and charring due to the surface temperature of the grinding blade 200, but also greatly slowing down the oxidation and wear of the grinding blade 200, thereby greatly improving the service life of the coffee grinder 10, and also greatly reducing the maintenance cost of the coffee grinder 10.

[0061] The embodiments described above are merely illustrative of several implementations of this disclosure, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of the disclosed patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this disclosure, and these all fall within the protection scope of this disclosure. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A plasma de-dusting structure for being disposed at a powder outlet of a coffee grinder, characterized in that, The plasma dust removal structure includes a plasma emitter and a protective cover plate. The plasma emitter is used to be installed and fixed to the bottom of the coffee grinder. The plasma emitting end of the plasma emitter is set towards the grinding blade at the powder outlet. The protective cover is used to cover the bottom of the grinding blade and is located between the plasma emitting end of the plasma emitter and the grinding blade. The protective cover is used to protect the grinding blade.

2. The plasma deflash structure of claim 1, wherein, The protective cover is designed for detachable installation with the grinding blade.

3. The plasma deflash structure of claim 2, wherein, The plasma powder removal structure also includes fasteners, and the protective cover plate is also formed with a positioning hole that is opposite to the threaded hole at the bottom of the grinding blade. The fastener passes through the positioning hole and is used to be threadedly connected to the threaded hole.

4. The plasma deflash structure of claim 1, wherein, The outer peripheral wall of the protective cover is also provided with a powder sweeping flange, which is used to be positioned opposite to the powder outlet.

5. The plasma deflash structure of claim 4, wherein, The number of powder-sweeping flanges is multiple, and the multiple powder-sweeping flanges are evenly spaced along the outer peripheral wall of the protective cover plate.

6. The plasma deflash structure of claim 3, wherein, An annular flange protrudes from the outer periphery of the threaded hole, surrounding the threaded hole and protruding from one side of the protective cover plate adjacent to the plasma emitter, together forming a receiving and protective groove communicating with the positioning hole. The receiving and protective groove is used to receive and protect the fastener; and / or The protective cover plate has a protruding snap-fit ​​flange on its side opposite to the plasma emitter, the snap-fit ​​flange being configured to be opposite to the snap-fit ​​groove at the bottom of the grinding blade; and / or, The protective cover plate is also provided with reinforcing ribs; and / or The protective cover is a polytetrafluoroethylene cover, an alumina ceramic cover, or a perylene cover.

7. A coffee grinder characterized in that, The invention includes a grinding blade and a plasma emitter as described in any one of claims 1 to 6. The plasma emitter is mounted and fixed to the bottom of the coffee grinder. The plasma emitting end of the plasma emitter is positioned facing the grinding blade at the powder outlet. A protective cover is mounted and placed on the bottom of the grinding blade, and the protective cover is positioned between the plasma emitting end of the plasma emitter and the grinding blade.

8. The coffee grinder of claim 7, wherein, A side-mounted transmission assembly is fixed to the side of the coffee grinder, and the power output end of the side-mounted transmission assembly is used to drive the connection with the power input end of the grinding blade.

9. The coffee grinder of claim 8, wherein, The side-mounted transmission assembly includes a drive motor, a drive gear, and a driven gear. The fixed end of the side-mounted transmission assembly is located on the drive motor, which is mounted and fixed to the side of the coffee grinder. The drive gear is sleeved on the power input end of the drive motor, and the driven gear is sleeved on the power input end of the grinding blade. The drive gear and the driven gear are connected in a transmission manner.

10. The coffee grinder of claim 9, wherein, The side-mounted transmission assembly further includes a transmission gear, which is rotatably connected to the coffee grinder and meshes with both the driving gear and the driven gear; and / or The side-mounted transmission assembly also includes a transmission protection cover, which has a transmission protection groove for accommodating and protecting the driving gear and the driven gear.

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