Planetary gear mechanism, grinding device and grinding equipment

Abstract

The invention discloses a planetary gear mechanism, a grinding device and grinding equipment. The technical problem that in the prior art, a planetary gear mechanism is low in power output stability is solved. The planetary gear mechanism comprises a fixing frame, a sun gear, a planet gear and an inner gear ring, the sun gear, the planet gear and the inner gear ring are sequentially meshed, the sun gear is used for power input, and the fixing frame is provided with an output part used for power output. The planet gear is rotatably mounted in the fixing frame; the planet gear comprises a first-stage gear and a second-stage gear which are arranged in the axial direction, the first-stage gear is meshed with the sun gear, the second-stage gear is meshed with the inner gear ring, and the first-stage gear is closer to the output part than the second-stage gear. The power transmission process of the planetary gear mechanism is not linearly transmitted, but is a process of axially transmitting the power in a reciprocating manner along the planetary gear, and an eccentric error is automatically corrected in the power transmission process, so that the eccentricity of the fixing frame can be remarkably reduced, and the transmission stability of the planetary gear mechanism is improved.

Description

Technical Field

[0001] The present application belongs to the technical field of planetary gear mechanisms, and in particular relates to a planetary gear mechanism, a grinding device and a grinding equipment. Background Art

[0002] The planetary gear mechanism, also known as the planetary gear, is a commonly used reduction mechanism with the advantages of large reduction ratio and small space occupation. The planetary gear mechanism is usually composed of a sun gear, planetary gears, an inner gear ring and a planetary carrier. The planetary gears are installed in the planetary carrier. The planetary gears mesh with the sun gear to realize the rotation of the planetary gears. At the same time, the planetary gears mesh with the inner gear ring to realize the rotation of the planetary gears and the planetary carrier as a whole (the planetary gears revolve around the axis of the sun gear).

[0003] Planetary gear mechanisms are widely used in large equipment such as vehicles and machine tools, and can achieve stable power output. However, for small equipment such as coffee grinders and powder grinders, higher motion accuracy is required to achieve uniformity of ground particles. Due to the compact structure of the planetary gear mechanism, it can meet the limited space inside small equipment, but the power output stability needs to be improved. Summary of the invention

[0004] In order to solve the problem of low power output stability of the current planetary gear mechanism, the present application provides a planetary gear mechanism, a grinding device and a grinding equipment.

[0005] In the first aspect of the present application: a planetary gear mechanism is provided, comprising a sun gear, planetary gears and an inner ring gear meshed in sequence, the sun gear is used for power input; the planetary gear mechanism also includes a fixed frame, the fixed frame has an output part for power output; the planetary gear is rotatably mounted in the fixed frame; the planetary gear includes a primary gear and a secondary gear arranged along the axial direction, the primary gear is meshed with the sun gear, the secondary gear is meshed with the inner ring gear, and the primary gear is closer to the output part than the secondary gear.

[0006] It can be seen from the above technical solution that the planetary gear mechanism provided by the present application adopts a power transmission scheme with sun gear input and fixed frame output, and improves the structure of the planetary gear and the installation method of the planetary gear in the fixed frame. By setting the planetary gear to include a primary gear and a secondary gear, the following power transmission path is formed: power element-sun gear-primary gear-secondary gear-fixed frame-output part. The installation method of the planetary gear in the fixed frame is set as follows: the primary gear is closer to the output part than the secondary gear, so that the power transmission process is not transmitted in a straight line, but has a process of reciprocating transmission along the axial direction of the planetary gear. The eccentricity caused by the structural error of the planetary gear mechanism itself is automatically corrected during the power transmission process, so that the eccentricity of the fixed frame can be significantly reduced, and the transmission stability of the planetary gear mechanism can be improved.

[0007] In some embodiments, the fixing frame includes a main body and the output part, the main body is provided with a gear installation cavity for accommodating the planetary gear; the output part is provided on one side of the main body along the axial direction, and the output part is an outward convex structure.

[0008] In some embodiments, a positioning portion for mounting a bearing is provided on the fixing frame, and the positioning portion and the output portion are located on the same side or opposite side of the main body.

[0009] In some embodiments, the first-stage gear and the second-stage gear are both provided with a through hole extending in the axial direction and being coaxial; the fixing frame is provided with a connecting shaft penetrating through the through hole;

[0010] The connecting shaft is rotationally matched with the through hole, and the connecting shaft is fixedly connected to the fixing frame; or, the connecting shaft is fixedly arranged in the through hole, and the connecting shaft is rotationally connected to the fixing frame.

[0011] In some embodiments, the diameter of the primary gear is greater than the diameter of the secondary gear.

[0012] In some embodiments, one of the primary gear and the secondary gear is a spur gear, and the other is a helical gear.

[0013] In some embodiments, the planetary gear mechanism further includes a bottom shell; the inner ring gear and the bottom shell are an integral structure.

[0014] In the second aspect of the present application, a grinding device is provided, comprising a grinding assembly, a power element and the planetary gear mechanism of the first aspect, wherein the grinding assembly is force-transmittingly connected to the output portion of the planetary gear mechanism, and the power element is force-transmittingly connected to the sun gear of the planetary gear mechanism.

[0015] In some embodiments, along the axial direction of the sun gear, the power element is closer to the secondary gear of the planetary gear mechanism than the sun gear.

[0016] In some embodiments, the grinding assembly includes a first mounting portion, a first grinding portion, and a second grinding portion that cooperates with the first grinding portion to achieve grinding; one of the first grinding portion and the second grinding portion is force-transmittingly connected to the output portion; and the planetary gear mechanism is mounted on the first mounting portion.

[0017] In some embodiments, the first mounting portion is a hollow lower shell, the fixing frame is located in the cavity of the lower shell, and the fixing frame is rotatably connected to the first mounting portion via a bearing.

[0018] In some embodiments, the grinding assembly further includes a powder thrower connected to the output portion for force transmission, the powder thrower is disposed below the first grinding portion and the second grinding portion, and the powder thrower, the first grinding portion and the second grinding portion are all located in the cavity of the lower shell.

[0019] In some embodiments, the first grinding part is connected to the output part in force transmission; the powder thrower is provided with a positioning cavity, and the output part is an outward convex structure and extends into the positioning cavity;

[0020] The first grinding part is provided with a limiting cavity, and the powder thrower is provided with an outwardly protruding limiting portion, and the limiting portion extends into the limiting cavity.

[0021] In some embodiments, the grinding assembly further comprises a powder blocking cover snap-connected to the lower shell, wherein the powder blocking cover is disposed in the cavity of the lower shell and is located above the powder thrower.

[0022] In some embodiments, the grinding device further includes a manipulation assembly, which includes a second mounting portion and an adjustment portion that are rotatably connected, the other of the first grinding portion and the second grinding portion is mounted on the second mounting portion, and the first mounting portion is threadedly connected to the adjustment portion.

[0023] In some embodiments, the second mounting portion and the first mounting portion are at least partially movably nested; the first mounting portion is provided with a plurality of threaded protrusions spaced apart along the circumferential direction, and the threaded protrusions are threadedly connected to the adjusting portion.

[0024] In some embodiments, the second mounting portion is a hollow upper shell, and the upper shell is movably mounted on the outside of the first mounting portion; the first mounting portion is provided with a powder outlet; the upper shell is provided with a through hole opposite to the position of the powder outlet; the upper shell is provided with a second fastener, and the upper shell is rotatably connected to the adjustment portion via the second fastener.

[0025] In some embodiments, the grinding device also includes a support assembly detachably connected to the grinding assembly; the support assembly includes a hollow support frame, a sleeve and an elastic member sleeved on the sleeve, and the support frame is provided with a mounting hole for mounting the sleeve and the elastic member.

[0026] In some embodiments, the support frame is a hollow structure, and a plurality of spaced anti-rotation blocks are provided on the inner surface of the support frame; the grinding assembly is provided with a first fastener, and the grinding assembly is fastened to the support frame via the first fastener, and the first fastener is located between two adjacent anti-rotation blocks.

[0027] In a third aspect of the present application, a grinding device is provided, comprising the grinding apparatus according to the second aspect.

[0028] In some embodiments, the grinding device is a coffee grinder, a bean grinder, or a powder grinder. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0030] Figure 1 A full cross-sectional view of a planetary gear mechanism in one or more embodiments of the present application is shown.

[0031] Figure 2 An exploded view of a planetary gear mechanism in one or more embodiments of the present application is shown.

[0032] Figure 3 Shows Figure 2 Exploded diagram of the fixed frame and planetary gears in the planetary gear mechanism.

[0033] Figure 4 A schematic diagram of the torque transmission path of a planetary gear mechanism in one or more embodiments of the present application is shown.

[0034] Figure 5 A schematic structural diagram of a grinding device in an embodiment of the present application is shown.

[0035] Figure 6 Shows Figure 5 A full cross-section of the grinding device in FIG.

[0036] Figure 7 Shows Figure 5 Exploded view of the grinding device in Figure 1.

[0037] Figure 8 Shows Figure 5 The grinding device in Figure 6 Cross-sectional view at AA.

[0038] Fig. 9 Shows Figure 5 The grinding device in Figure 6 Cross-sectional view at BB.

[0039] Fig.10 Shows Figure 5 The grinding device in Figure 6 Cross-sectional view at CC.

[0040] Fig.11 Shows Figure 5 The grinding device in Figure 6 Cross-sectional view at DD.

[0041] Description of reference numerals: 100-grinding assembly; 110-first mounting portion; 111-powder outlet; 110a-lower housing; 111a-first buckle; 112a-threaded protrusion; 120-first grinding portion; 121-limiting cavity; 130-second grinding portion; 140-powder thrower; 141-positioning cavity; 142-limiting portion; 150-first screw; 151-gasket; 160-powder blocking cover; 170-sealing ring; 180-fixing frame; 181-handle. 200-support assembly; 210-support frame; 211-stop block; 212-mounting hole; 220-sleeve; 230-elastic member. 300-power output assembly; 310-power element; 310a-motor; 320-planetary gear mechanism; 321-fixed frame, 3211-main body, 3212-gear installation cavity, 3213-pin hole, 3214-positioning part, 3215-output part; 322-sun gear, 3221-transmission part; 323-planetary gear, 3231-first gear, 3232-second gear, 3233-through hole; 324-connecting shaft; 325-inner gear ring; 326-bottom shell; 327-third clip; 330-bearing; 340-washer; 350-second screw. 400-control assembly; 410-second installation part; 410a-upper shell; 411a-second clip; 412a-through hole; 420-adjustment part. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0043] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0044] In the related art, the power transmission path of the planetary gear mechanism is: sun gear input-planet gear-planet carrier output, the sun gear, planet gear, and inner ring gear mesh in sequence, and the power is transmitted linearly between the sun gear, planet gear, and inner ring gear. Therefore, if there are structural deviations or installation deviations in the sun gear, planet gear, and inner ring gear, it will affect the stability of the output power of the planet carrier and cause eccentric torque. For small equipment such as coffee grinders and powder grinders, eccentric torque will cause uneven gaps between the upper and lower cutters of the grinding device, and the upper and lower cutters will rotate unsteadily relative to each other, resulting in high noise and shortened parts service life.

[0045] The embodiments of the present application provide a planetary gear mechanism, a grinding device and a grinding apparatus, which can at least to some extent solve the technical problem of low power output stability of the current planetary gear mechanism. The present application is described below in conjunction with the accompanying drawings and with reference to specific embodiments:

[0046] In a first aspect of an embodiment of the present application, a planetary gear mechanism is provided, such as Figure 1 and Figure 2 , which shows a full cross-sectional view and an exploded view of the planetary gear mechanism. The planetary gear mechanism 320 includes a fixed frame 321, a sun gear 322, a planetary gear 323 and an inner gear ring 325. The planetary gear 323 is rotatably mounted in the fixed frame 321. The sun gear 322 of the planetary gear mechanism 320 is connected to the output shaft of a power source (such as an electric motor, etc.) for power input. Figure 3 and Figure 4 The fixed frame 321 of the planetary gear mechanism 320 is provided with an output part 3215 for power output. The power is input from the sun gear 322, and after being decelerated by the sun gear 322-planetary gear 323-inner gear ring 325 inside the planetary gear mechanism 320, it is output from the output part 3215 of the fixed frame 321.

[0047] In the related art, the planetary gear mechanism outputs torque by meshing the planetary gear with the external gear ring, and the planetary gear is mounted on the planetary carrier, and the planetary carrier and the external gear ring are two independent parts. The planetary gear mechanism 320 of the present application is provided with a fixed frame 321, which is used to install the planetary gear 323 on the one hand to realize the function of the planetary carrier, and can directly output the torque on the other hand, that is, the planetary carrier and the torque output component are integrated into the fixed frame 321. The fixed frame 321 is equivalent to the integration of the planetary carrier and the external gear ring in the related art, which saves a component, and the structure of the planetary gear mechanism 320 is simpler, the internal space is more compact, and the volume is reduced.

[0048] The sun gear 322 can be an independent gear, which is connected to the output shaft of the power source by interference fit or key connection. The sun gear 322 can also be an integrally formed gear shaft, and the teeth of the gear shaft form the sun gear 322. Figure 1 and Figure 2 , shows a structural diagram of the sun gear 322 in some embodiments, the sun gear 322 adopts the structural form of a gear shaft, the tooth portion of the gear shaft forms the sun gear 322, the shaft portion of the gear shaft forms a transmission portion 3221 for connecting to the power source, the transmission portion 3221 can be provided with an assembly hole, the transmission portion 3221 is mounted on the output shaft of the power source through the assembly hole, and is transmission-connected to the output shaft of the power source by interference fitting, key connection or by setting a stop plane on the shaft.

[0049] The planetary gear 323 is rotatably mounted in the fixing frame 321, and the fixing frame 321 rotates around the sun gear 322 as the planetary gear 323 revolves. Figure 3 and Figure 4 The planetary gear 323 is rotatably mounted in the fixed frame 321 through the connecting shaft 324. Specifically, the planetary gear 323 is provided with a through hole 3233 extending axially and penetrating the planetary gear 323. The connecting shaft 324 is rotatably inserted into the through hole 3233. The connecting shaft 324 and the through hole 3233 can be clearance-fitted, or a bearing can be provided between the connecting shaft 324 and the through hole 3233 to achieve relative rotation between the planetary gear 323 and the connecting shaft 324. The connecting shaft 324 is fixedly connected to the fixed frame 321. The revolution of the planetary gear 323 drives the connecting shaft 324 and the fixed frame 321 to rotate around the sun gear 322 together, and outputs power through the output portion 3215 of the fixed frame 321.

[0050] In some embodiments, the connecting shaft 324 and the through hole 3233 may be provided with an interference fit, and the connecting shaft 324 and the fixing frame 321 may be rotatably connected, that is, the planetary gear 323 may rotate around the axis of the connecting shaft 324, and the connecting shaft 324 may drive the fixing frame 321 to rotate around the sun gear 322, and the power may be output through the output portion 3215 of the fixing frame 321. The specific assembly structure of the planetary gear 323 and the fixing frame 321 is not limited in this application.

[0051] See also Figure 3 , shows the specific structure of the planetary gear 323 in some embodiments, the planetary gear 323 includes a primary gear 3231 and a secondary gear 3232, the primary gear 3231 and the secondary gear 3232 are arranged in sequence along the axial direction and are coaxial. The primary gear 3231 meshes with the sun gear 322, and the secondary gear 3232 meshes with the inner gear ring 325. The primary gear 3231 is closer to the output part 3215 than the secondary gear 3232, forming Figure 4The power transmission path shown by the arrow in the middle is as follows: power element 310-sun gear 322-primary gear 3231-secondary gear 3232-connecting shaft 324-fixed frame 321-output part 3215-driven part. Since the primary gear 3231 is closer to the output part 3215 than the secondary gear 3232, the torque transmission process is not transmitted in a straight line, but has a reciprocating transmission process along the axial direction of the planetary gear 323. Figure 4 The upward and downward arrows in the figure reflect the process of reciprocating power transmission. The eccentricity caused by the structural error and / or assembly error of the planetary gear mechanism 320 itself is automatically corrected during the process of reciprocating power transmission, which can improve the transmission stability of the planetary gear mechanism 320.

[0052] Figure 4 The structure diagram of the planetary gear mechanism 320 applied to the grinding device is shown. The first grinding part 120 and the powder thrower 140 of the grinding device are fixedly mounted on the output part 3215 through the first screw 150. The output part 3215 transmits power to the first grinding part 120 and the powder thrower 140. The planetary gear mechanism 320 applied to the grinding device can significantly reduce the eccentricity between the upper and lower grinding tools, so that the gap between the upper and lower grinding tools is uniform and stable. Please refer to Figure 3 and Figure 4 In some embodiments, the rotation axis of the planetary gear 323 is parallel to the rotation axis of the output part 3215 , and along the rotation axis direction of the output part 3215 , the output part 3215 , the first-stage gear 3231 , and the second-stage gear 3232 are arranged in sequence.

[0053] The primary gear 3231 and the secondary gear 3232 of the planetary gear 323 can be integrally formed, that is, the primary gear 3231 and the secondary gear 3232 are directly processed on the blank, and the primary gear 3231 and the secondary gear 3232 are both provided with concentric through holes to form the through hole 3233 of the planetary gear 323. The connecting shaft 324 can rotatably extend into the through hole 3233, and both ends of the connecting shaft 324 are fixedly connected to the fixing frame 321, such as Figure 3 and Figure 4 In some embodiments, the primary gear 3231 and the secondary gear 3232 can also be formed independently and then installed on the same central shaft. The primary gear 3231 and the secondary gear 3232 are connected to the central shaft through a key to transmit torque. The central shaft can be rotatably connected to the fixing frame 321, for example, the central shaft can be rotatably extended into the pin hole 3213 of the fixing frame 321. The specific connection method and molding method of the primary gear 3231 and the secondary gear 3232 are not limited in this application.

[0054] In some embodiments, the diameters of the primary gear 3231 and the secondary gear 3232 are different, for example, the diameter of the primary gear 3231 is larger than the diameter of the secondary gear 3232; or the diameter of the primary gear 3231 is smaller than the diameter of the secondary gear 3232. Figure 3 and Figure 4 In some embodiments, the diameter of the first-stage gear 3231 is larger than the diameter of the second-stage gear 3232. On the one hand, the diameter of the sun gear 322 located in the center can be reduced. On the other hand, since the first-stage gear 3231 is closer to the output part 3215, by setting the diameter of the first-stage gear 3231 larger, the output part 3215 has a larger installation area, which is convenient for setting the driven part at the output end of the planetary gear mechanism 320.

[0055] For some working conditions, the planetary gear mechanism 320 is required to withstand a certain axial force. In some embodiments, one of the first gear 3231 and the second gear 3232 can be a helical gear, and the other can be a spur gear. Figure 3 In some embodiments, the diameter of the first gear 3231 is larger than the diameter of the second gear 3232. The first gear 3231 is a helical gear, and its larger diameter enables the planetary gear mechanism 320 to withstand a larger axial force.

[0056] In some embodiments, see Figure 3 , shows the specific structure of the fixing frame 321, the fixing frame 321 includes a main body 3211 and an output part 3215, the output part 3215 can be a protruding structure protruding from the main body 3211, or a spline or spline groove arranged on the main body 3211. The main body 3211 is provided with a plurality of gear installation cavities 3212 and pin holes 3213, the pin holes 3213 are connected to the gear installation cavity 3212, the two ends of the connecting shaft 324 are respectively installed in the corresponding pin holes 3213, the planetary gear 323 is rotatably arranged in the gear installation cavity 3212 through the connecting shaft 324, and the planetary gear 323 is at least partially exposed outside the gear installation cavity 3212 to mesh with the inner gear ring 325. In some embodiments, on the premise of ensuring the structural strength of the fixing frame 321, a plurality of weight reduction holes can also be arranged on the fixing frame 321.

[0057] See also Figure 3 and Figure 4 In some embodiments, the output part 3215 is a protruding structure protruding from the main body 3211, and a threaded hole is provided in the output part 3215, so that the driven part can be installed through the first screw 150, and the fastening force provided by the threaded connection presses the driven part onto the output part 3215. Of course, in other embodiments, the driven part and the output part 3215 may be provided with an interference fit or a key connection.

[0058] In order to improve the transmission stability of the fixing frame 321, in some embodiments, the fixing frame 321 further includes a positioning portion 3214, which is disposed on the main body 3211, and the output portion 3215 is located at one end of the main body 3211 along the axial direction. The positioning portion 3214 can be disposed at the same end or the opposite end of the output portion 3215. In some embodiments, please refer to Figure 3 The positioning portion 3214 is a collar coaxially arranged with the output portion 3215 and located on the same side. The collar surrounds the outer side of the output portion 3215 and is used to cooperate with the inner ring of the bearing.

[0059] In some embodiments, see Figure 1 and Figure 5 The planetary gear mechanism 320 further includes a bottom shell 326, and the inner ring gear 325 is mounted on the bottom shell 326. The bottom shell 326 has a large inner cavity, and the fixing frame 321, the sun gear 322, the planetary gear 323 and the inner ring gear 325 can all be arranged in the inner cavity of the bottom shell 326. Figure 1 By providing the bottom shell 326, the planetary gear mechanism 320 becomes an integral unit and is mounted on the external structure.

[0060] Considering that the inner gear ring 325 in the planetary gear mechanism 320 does not need to rotate, in some embodiments, the inner gear ring 325 of the planetary gear mechanism 320 and the bottom shell 326 are set as an integrated structure, for example, the inner gear ring 325 is directly processed on the inner surface of the bottom shell 326. Of course, the inner gear ring 325 of the planetary gear mechanism 320 and the bottom shell 326 can also be connected and formed by welding, clamping, etc., and the embodiment of the present application is not limited to this.

[0061] In a second aspect of the embodiments of the present application, a grinding device is provided. Compared with the grinding devices in the related art, the grinding device has a smaller volume, which solves the technical problem of the large volume of the current grinding devices to a certain extent. Figure 5 , Figure 6 and Figure 7 As shown, it is an overall structural diagram, a full cross-sectional diagram and an exploded diagram of the grinding device. The grinding device comprises a grinding assembly 100, a power element 310 and a planetary gear mechanism 320 of any embodiment of the first aspect described above, and the power element 310 is connected to the sun gear 322 of the planetary gear mechanism 320 by force transmission to form a power output assembly 300. The grinding assembly 100 is connected to the output part 3215 of the planetary gear mechanism 320 by force transmission, and the power output by the power element 310 is input by the sun gear 322 of the planetary gear mechanism 320, and after being decelerated by the sun gear 322-planetary gear 323-inner gear ring 325 inside the planetary gear mechanism 320, it is output to the grinding assembly 100 by the output part 3215 of the fixed frame 321.

[0062] The planetary gear mechanism 320 has the characteristics of large reduction ratio, small space occupation, stable power output, etc., and can also reduce the noise of the grinding device. Since the primary gear 3231 in the planetary gear mechanism 320 is closer to the output part 3215 than the secondary gear 3232, the following power transmission path is formed: power element 310-sun gear 322-primary gear 3231-secondary gear 3232-fixed frame 321-output part 3215-grinding assembly 100, the torque transmission process is not transmitted along a straight line, but has a process of reciprocating transmission along the axial direction of the planetary gear 323, which can improve the transmission stability of the planetary gear mechanism 320, and significantly reduce the eccentricity of the fixed frame 321 relative to the upper and lower grinding tools in the grinding assembly 100, so that the gap between the upper and lower grinding tools is uniform and stable.

[0063] See also Figure 6 In some embodiments, along the axial direction of the sun gear 322, the power element 310 is closer to the secondary gear 3232 of the planetary gear mechanism 320 than the sun gear 322. The sun gear 322 adopts a gear shaft structure, the teeth of the gear shaft form the sun gear 322, and the shaft of the gear shaft forms a transmission part 3221 for connecting to a power source. The transmission part 3221 may have an assembly hole, and the transmission part 3221 is mounted on the output shaft of the power element 310 through the assembly hole, and is transmission-connected to the output shaft of the power element 310 by interference fit or key connection. Along the axial direction of the sun gear 322, the output shaft of the power element 310 and the secondary gear 3232 are opposite to each other, so that the power transmission direction in the process of power transmission from the power element 310 to the sun gear 322 is exactly opposite to the power transmission direction in the process of power transmission from the primary gear 3231 to the secondary gear 3232, and the length of the transmission path is basically the same, forming the first reciprocating transmission of power; in the transmission process of the primary gear 3231-the secondary gear 3232-the connecting shaft 324, the second reciprocating transmission of power is formed. The eccentricity is further reduced through two reciprocating transmissions.

[0064] The power element 310 of the power output assembly 300 may be a motor 310a, a hydraulic motor, etc., which is not limited in the present application. In some embodiments, the power element 310 of the power output assembly 300 is a motor 310a. Since the motor 310a has a high speed, it is usually necessary to reduce the motor speed and output it to the actuator for use. The planetary gear mechanism 320 plays a role in reducing the speed, and some planetary gear mechanisms 320 can also play an effect of increasing torque.

[0065] In certain embodiments, such as Figure 6 as well as Figure 7As shown, the grinding assembly 100 includes a first mounting portion 110, a first grinding portion 120 (equivalent to a lower grinding tool) and a second grinding portion 130 (equivalent to an upper grinding tool). The first grinding portion 120 and the second grinding portion 130 cooperate to achieve grinding. The first mounting portion 110 is connected to an external structure to achieve the installation and fixation of the entire grinding device. Figure 5 In some embodiments, the grinding device further includes a supporting assembly 200 , which is connected to the first mounting portion 110 , and the entire grinding device is installed and fixed by the supporting assembly 200 .

[0066] The planetary gear mechanism 320 is connected to the support assembly 200 and / or the first mounting portion 110, that is, the planetary gear mechanism 320 can be installed and fixed by the support assembly 200 or the first mounting portion 110, or can be installed and fixed by both the support assembly 200 and the first mounting portion 110, and the embodiment of the present application does not limit this. One of the first grinding portion 120 and the second grinding portion 130 is connected to the fixing frame 321 of the planetary gear mechanism 320 for force transmission, and the other is fixedly installed, so that the power output assembly 300 can drive the first grinding portion 120 and the second grinding portion 130 in the grinding assembly 100 to rotate relative to each other to grind the bean food.

[0067] In order to realize the fixed arrangement of the power output assembly 300 on the grinding device, as Figure 6 , Figure 7 and Fig.11 As shown, the planetary gear mechanism 320 also includes a bottom shell 326, which is fixedly connected to the outer shell of the power element 310, and the bottom shell 326 is connected to the support assembly 200 and / or the first mounting portion 110 to achieve a fixed setting of the power output assembly 300 through the shell.

[0068] In order to achieve a fixed connection between the bottom shell 326 and the outer shell of the power element 310, in some embodiments, such as Figure 7 As shown, the power output assembly 300 also includes a second screw 350, the bottom shell 326 is provided with a through hole, and the outer shell of the power element 310 is provided with a threaded hole. The second screw 350 passes through the through hole of the bottom shell 326 and is connected to the threaded hole of the outer shell of the power element 310, so as to realize the fixed connection between the bottom shell 326 and the outer shell of the power element 310 through the second screw 350.

[0069] In some embodiments, Figure 6 As shown, the bottom shell 326 is connected to the first mounting portion 110 to fix the bottom shell 326 on the first mounting portion 110. Further, the bottom shell 326 is provided with a third fastener 327, and the third fastener 327 of the bottom shell 326 is fastened to the first mounting portion 110 to facilitate the assembly and disassembly between the bottom shell 326 and the first mounting portion 110.

[0070] In some embodiments, Figure 6 As shown, in order to facilitate the arrangement of other components in the grinding assembly 100 and the planetary gear mechanism 320 in the first mounting portion 110, the first mounting portion 110 is set as a hollow lower shell 110a. At the same time, in order to facilitate the arrangement of the first mounting portion 110 in the support assembly 200, the support assembly 200 is set as a hollow structure.

[0071] See also Figure 7 and Fig.11 In some embodiments, in order to achieve a stable connection between the lower shell 110a and the support assembly 200, a first snap-fitting member 111a is provided on the lower shell 110a, and the lower shell 110a is snap-fitted with the support assembly 200 through the first snap-fitting member 111a. Thus, by setting the snap-fitting connection between the lower shell 110a and the support assembly 200, the shell and the support assembly 200 are stably connected, and the disassembly and assembly of the lower shell 110a on the support assembly 200 is also facilitated. Please refer to Figure 7 and Fig.11 In some embodiments, in order to limit the rotation of the lower shell 110a on the support assembly 200, a plurality of spaced stop blocks 211 are provided on the inner surface of the support assembly 200, and the first latch 111a of the lower shell 110a is located between two adjacent stop blocks 211, so as to prevent the lower shell 110a from rotating axially by providing the stop blocks 211.

[0072] In order to enable the ground powder to be discharged better, in some embodiments, as Figure 6 as well as Figure 7 As shown, the grinding assembly 100 also includes a powder thrower 140, which is connected to the fixed frame 321 by force transmission, and is arranged below the first grinding part 120 and the second grinding part 130, and the powder thrower 140, the first grinding part 120 and the second grinding part 130 are all located in the cavity of the lower shell 110a. By arranging the powder thrower 140, the powder ground by the first grinding part 120 and the second grinding part 130 falls on the powder thrower 140, and then the centrifugal force generated by the rotation of the powder thrower 140 is used to throw the powder to the inner cavity wall of the lower shell 110a, so as to facilitate the discharge of the powder. In addition, since the first grinding part 120 or the second grinding part 130, and the powder thrower 140 are all force-transmittingly connected to the fixed frame 321, the first grinding part 120 or the second grinding part 130, the powder thrower 140, and the fixed frame 321 can only rotate around the axial direction but not move along the axial direction, thereby avoiding the axial relative displacement between the planetary gear mechanism 320 and the grinding assembly 100 and reducing the noise of the grinding device during operation.

[0073] In the specific configuration of the first grinding part 120 and the second grinding part 130, in some embodiments, as Figure 6 As shown, the first grinding part 120 is connected to the fixing frame 321 by force transmission, and correspondingly, the outer structure of the second grinding part 130 is fixedly connected, thereby forming a relative rotation setting relationship in which the first grinding part 120 rotates and the second grinding part 130 is fixed. Figure 6 and Fig. 9 In some embodiments, the fixing frame 321 is connected to the first mounting portion 110 via a bearing 330 to achieve a rotational connection between the fixing frame 321 and the first mounting portion 110. Fig. 9 As shown, the power output assembly 300 further includes a washer 340 , which is disposed between the powder thrower 140 and the bearing 330 , so as to ensure the rotation effect of the powder thrower 140 through the washer 340 and avoid interference between the powder thrower 140 and the bearing 330 .

[0074] The powder ejector 140 is provided with a positioning cavity 141, the output portion 3215 of the fixed frame 321 extends into the positioning cavity 141, the first grinding part 120 is provided with a limiting cavity 121, and the powder ejector 140 is provided with a convex limiting portion 142, and the limiting portion 142 extends into the limiting cavity 121. Thus, by providing the positioning cavity 141, the limiting cavity 121, and the limiting portion 142, the output portion 3215 of the fixed frame 321 is inserted into the positioning cavity 141 of the powder ejector 140, and the limiting portion 142 of the powder ejector 140 is inserted into the limiting cavity 121 of the first grinding part 120, so as to realize the positioning assembly between the first grinding part 120, the powder ejector 140 and the fixed frame 321, so that the fixed frame 321 can simultaneously drive the powder ejector 140 and the first grinding part 120 to rotate. In addition, by providing the positioning cavity 141 , the limiting cavity 121 and the limiting portion 142 , the first grinding portion 120 , the powder thrower 140 and the fixing frame 321 are also limited in the axial and circumferential directions.

[0075] In order to achieve a stable connection between the first grinding part 120, the powder thrower 140 and the fixing frame 321, in some embodiments, as Figure 6 as well as Figure 7 As shown, the grinding assembly 100 further includes a first screw 150, the powder thrower 140 is provided with a through hole, the fixing frame 321 is provided with a threaded hole, and the first screw 150 passes through the through hole of the powder thrower 140 and is connected with the threaded hole of the fixing frame 321, so that the first grinding part 120, the powder thrower 140 and the fixing frame 321 are stably connected together through the first screw 150. In addition, in order to better fix the first screw 150 and prevent the first screw 150 from loosening, a gasket 151 is sleeved on the first screw 150, and the gasket 151 is arranged between the head of the first screw 150 and the first grinding part 120.

[0076] In order to make the powder ground by the first grinding part 120 and the second grinding part 130 fall onto the powder thrower 140 better, in some embodiments, such as Figure 6 as well as Figure 7 As shown, the grinding assembly 100 also includes a powder blocking cover 160, which is snap-connected with the threaded protrusion 112a, and the powder blocking cover 160 is arranged in the cavity of the lower shell 110a and is located above the powder thrower 140. Due to the relative rotation of the first grinding part 120 and the second grinding part 130, a part of the ground powder will be thrown on the cavity surface of the lower shell 110a, and cannot fall on the powder thrower 140, and even a part of the powder will be thrown out of the lower shell 110a through the gap between the threaded protrusions 112a of the lower shell 110a. Therefore, by setting the powder blocking cover 160, the powder obtained by grinding is limited to the inside of the powder blocking cover 160, and can fall on the powder thrower 140 as much as possible, and then under the action of the centrifugal force of the powder thrower 140, it is uniformly thrown outward.

[0077] In some embodiments, Figure 6 As shown, the powder blocking cover 160 is sleeved on the outside of the second grinding part 130. In order to ensure the sealing between the powder blocking cover 160 and the second grinding part 130, the grinding assembly 100 also includes a sealing ring 170. The sealing ring 170 is arranged between the powder blocking cover 160 and the second grinding part 130 to prevent powder from leaking out from the powder blocking cover 160 and the second grinding part 130.

[0078] In some embodiments, the grinding device further includes a manipulation assembly 400. Figure 5 In some embodiments, the control assembly 400 is connected to the first mounting portion 110 and is at least partially nested with the first mounting portion 110. Since the first mounting portion 110 serves as the mounting base for other components in the grinding assembly 100 and the control assembly 400, the axial dimension of the grinding device can be reduced by at least partially axially nesting the first mounting portion 110 and the control assembly 400. However, the first mounting portion 110 and the control assembly 400 in the related art adopt a non-axial nesting arrangement, which will cause the axial dimension of the grinding device to be too long, and then cause the volume of the grinding device to be too large. Therefore, the first mounting portion 110 and the control assembly 400 in the embodiment of the present application are at least partially axially nested, which can significantly reduce the axial dimension of the grinding device, thereby reducing the volume of the grinding device, and to a certain extent solves the technical problem of the large volume of the current grinding device.

[0079] In order to enable the first grinding part 120 and the second grinding part 130 to adjust the grinding distance. In some embodiments, as Figure 7As shown, the control assembly 400 includes a second mounting portion 410 and an adjusting portion 420, the second mounting portion 410 and the adjusting portion 420 are connected together, one of the first grinding portion 120 and the second grinding portion 130 is connected to the fixing frame 321 of the planetary gear mechanism 320 for force transmission, and the other is installed on the second mounting portion 410 of the control assembly 400. Figure 6 In some embodiments, considering that the first mounting portion 110 serves as the mounting base for other components in the grinding assembly 100, for the convenience of installation, the first mounting portion 110 is arranged to be closer to the first grinding portion 120 and the second grinding portion 130 than the second mounting portion 410, that is, the second mounting portion 410 is movably mounted on the outside of the first mounting portion 110, and the nesting arrangement of the control assembly 400 and the first mounting portion 110 is realized through the second mounting portion 410. In other embodiments, the first mounting portion 110 may also be movably mounted on the outside of the second mounting portion 410, and a portion of the first mounting portion 110 extends into the inner cavity of the second mounting portion 410 to connect other components in the grinding assembly 100.

[0080] See also Figure 6 and Figure 8 , the first mounting portion 110 is threadedly connected with the adjusting portion 420, the first mounting portion 110 is provided with an external thread, the adjusting portion 420 is provided with an internal thread, and the internal thread of the adjusting portion 420 is connected with the external thread of the first mounting portion 110. Of course, in other embodiments, the first mounting portion 110 may be sleeved on the outside of the second mounting portion 410, and correspondingly, the first mounting portion 110 is provided with an internal thread, the adjusting portion 420 is provided with an external thread, and the external thread of the adjusting portion 420 is connected with the internal thread of the first mounting portion 110, and the embodiment of the present application is not limited to this.

[0081] Specifically, on the one hand, by arranging the first mounting part 110 and the second mounting part 410 to be movably nested and connected through the adjusting part 420, since the first mounting part 110, the support assembly 200 and the planetary gear mechanism 320 are connected and no displacement will occur in the axial direction, when the adjusting part 420 is rotated, the adjusting part 420 will drive the second mounting part 410 to move axially together, so that the first grinding part 120 and the second grinding part 130 respectively connected to the planetary gear mechanism 320 and the second mounting part 410 produce axial relative movement, and the axial gap between the first grinding part 120 and the second grinding part 130 can be adjusted to change the particle size of the ground powder. On the other hand, since the first mounting part 110 and the second mounting part 410 are connected via the adjusting part 420, and the connection method is a threaded connection, the first mounting part 110 and the second mounting part 410 can only be axially controlled displaced, and there will be no active axial movement and no active radial displacement during operation, thereby ensuring the required grinding gap between the first grinding part 120 and the second grinding part 130, avoiding collision and heat generation between the first grinding part 120 and the second grinding part 130, and solving the problems of high noise of the grinding device and burning of grinding powder.

[0082] See also Figure 7 and Fig.11 In some embodiments, since the first mounting portion 110 is threadedly connected to the adjusting portion 420, a plurality of spaced stop blocks 211 are provided on the inner surface of the supporting assembly 200, and the first latch 111a of the lower shell 110a is located between two adjacent stop blocks 211, so as to prevent the lower shell 110a from rotating axially by setting the stop blocks 211, thereby providing a reaction force for the lower shell 110a when the adjusting portion 420 is rotated, so that the second mounting portion 410 can move better axially on the first mounting portion 110.

[0083] During the operation of the grinding device, the grinding device will generate heat due to the internal grinding. When the lower shell 110a is heated, it will deform to a certain extent, thereby affecting the threaded connection between the lower shell 110a and the adjustment part 420. In some embodiments, Figure 7As shown, the lower shell 110a is provided with a plurality of threaded protrusions 112a arranged at intervals along the circumferential direction, and the threaded protrusions 112a are threadedly connected with the adjusting portion 420. Therefore, by setting the thread of the lower shell 110a as a threaded segment arranged at intervals along the circumferential direction, the threaded connection between the lower shell 110a and the adjusting portion 420 is not affected, and because the threaded protrusions 112a are arranged at intervals, the lower shell 110a can still be effectively connected with the adjusting portion 420 when it is heated and deformed to a certain extent. At this time, the circumferential spacing of the threaded protrusions 112a will become smaller to ensure that the lower shell 110a is threadedly connected with the adjusting portion 420. In the embodiment of the present application, the lower shell 110a is provided with 3 threaded protrusions 112a. Of course, the lower shell 110a can also be provided with 2, 4, 5, 6, etc. threaded protrusions 112a, and the embodiment of the present application is not limited to this.

[0084] When the operation components are specifically configured, in some implementations, such as Figure 7 As shown, the second mounting portion 410 is a hollow upper shell 410a, so that the upper shell 410a can be movably sleeved on the outer side of the lower shell 110a. Further, the upper shell 410a is provided with a second snap member 411a, and the upper shell 410a is rotatably connected with the adjustment portion 420 through the second snap member 411a, so that the upper shell 410a can be driven to move axially only by rotating the adjustment portion 420. Further, by arranging the upper shell 410a and the lower shell 110a to be nested in the axial direction, the upper shell 410a can only move axially on the lower shell 110a, and cannot rotate around the axial direction, thereby ensuring the connection stability of the upper shell 410a and the lower shell 110a. Therefore, by setting the upper shell 410a to be rotatably connected with the adjustment portion 420, when the adjustment portion 420 is rotated, the upper shell 410a only moves axially with the adjustment portion 420, and does not rotate.

[0085] In order to achieve the connection between the second grinding part 130 and the upper housing 410a, in some embodiments, as Figure 7 As shown, the grinding assembly 100 further includes a fixing frame 180, and the second grinding part 130 is clamped on the fixing frame 180, and the fixing frame 180 is clamped on the upper shell 410a, so that the second grinding part 130 is fixed to the upper shell 410a through the fixing frame 180, and it is convenient for disassembly and assembly. In addition, the grinding assembly 100 further includes a handle 181, and the handle 181 is arranged on the fixing frame 180, so that after using the grinding device, the second grinding part 130 can be taken out of the grinding device through the handle 181 to clean the inside of the grinding device.

[0086] In order to discharge the ground powder in the grinding device, in some embodiments, the upper shell 410a is provided with a through hole 412a, and the first mounting portion 110 is provided with a powder outlet 111, and the through hole 412a of the upper shell 410a is arranged corresponding to the powder outlet 111 of the first mounting portion 110. The second mounting portion 410 is movably mounted on the outside of the first mounting portion 110, that is, the upper shell 410a is movably mounted on the outside of the lower shell 110a, and the powder ground by the first grinding portion 120 and the second grinding portion 130 falls on the powder thrower 140, and then the powder is thrown out of the grinding device through the through hole 412a of the upper shell 410a and the powder outlet 111 of the first mounting portion 110 in sequence by the centrifugal force of the powder thrower 140, thereby achieving the discharge of powder from the grinding device.

[0087] In some embodiments, the entire grinding device is mounted on the grinding equipment through the support assembly 200. When the grinding device is working, the first grinding part 120 and the second grinding part 130 rotate relative to each other to grind the bean food material between the first grinding part 120 and the second grinding part 130. This process generates vibration and noise, which becomes a major factor affecting user experience. Figure 7 and Fig.11 In some embodiments, the support assembly 200 includes a support frame 210, a sleeve 220 and an elastic member 230. The support frame 210 is hollow so that the lower housing 110a and the planetary gear mechanism 320 are both arranged in the support frame 210, so that the first buckle 111a of the lower housing 110a is engaged with the support frame 210, and the anti-rotation block 211 is arranged on the inner circumference of the support frame 210. The support frame 210 is provided with a mounting hole 212 for mounting the sleeve 220 and the elastic member 230. The elastic member 230 is sleeved on the sleeve 220 and mounted in the mounting hole 212 of the support frame 210. By arranging the elastic member 230 between the support frame 210 and the sleeve 220, when the grinding device is installed on the main machine of the grinding equipment, the vibration transmission at the installation place can be reduced, and the working noise of the equipment can be reduced.

[0088] In a third aspect of the embodiment of the present application, a grinding device is provided, the grinding device comprising the grinding device of the second aspect. The grinding device is a functional device arranged in the grinding device, and because the first mounting portion 110 and the control assembly 400 in the grinding device are at least partially axially nested, the axial dimension of the grinding device can be significantly reduced, thereby reducing the volume of the grinding device, and correspondingly reducing the volume of the grinding device, which to a certain extent solves the technical problem that the current grinding device has a large volume, resulting in a large volume of the grinding device.

[0089] In some embodiments, the grinding device is a grinding coffee machine, and coffee beans fall into between the first grinding part 120 and the second grinding part 130 through the bean hopper, and are ground into coffee powder through the relative rotation between the first grinding part 120 and the second grinding part 130, and are discharged to the powder outlet 111 of the first mounting part 110 through the powder thrower 140. A powder outlet pipe is installed on the powder outlet 111 of the first mounting part 110 to transport the coffee powder to the brewing component.

[0090] In some embodiments, the grinding device is a grinder, and dried pepper, dried peanuts and other bean ingredients are placed between the first grinding part 120 and the second grinding part 130, and powdered ingredients such as pepper powder and peanut powder can be obtained from the powder outlet 111 of the first mounting part 110. In other embodiments, the grinding device can also be a bean grinder, a soymilk machine, etc., which is not limited in the present embodiment.

[0091] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0092] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships 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 referred device or element 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.

[0093] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0094] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; 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, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0095] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0096] 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 representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification.

[0097] In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the fact that they can be implemented by ordinary technicians in this field. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0098] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A planetary gear mechanism, comprising a sun gear, planetary gears and an inner gear ring meshing in sequence, wherein the sun gear is used for power input, and characterized in that: It also includes a fixed frame, which has an output part for power output; the planetary gear is rotatably installed in the fixed frame; the planetary gear includes a primary gear and a secondary gear arranged along the axial direction, the primary gear is meshed with the sun gear, the secondary gear is meshed with the inner ring gear, and the primary gear is closer to the output part than the secondary gear.

2. The planetary gear mechanism according to claim 1, wherein: The fixing frame includes a main body and the output part. The main body is provided with a gear installation cavity for accommodating the planetary gear. The output part is arranged on one side of the main body along the axial direction, and the output part is an outward convex structure.

3. The planetary gear mechanism according to claim 2, wherein: The fixing frame is provided with a positioning portion for mounting the bearing, and the positioning portion and the output portion are located on the same side or opposite side of the main body.

4. The planetary gear mechanism according to claim 1, wherein: The first-stage gear and the second-stage gear are both provided with a through hole extending in the axial direction and being coaxial; the fixing frame is provided with a connecting shaft penetrating through the through hole; The connecting shaft is rotationally matched with the through hole, and the connecting shaft is fixedly connected to the fixing frame; or, the connecting shaft is fixedly arranged in the through hole, and the connecting shaft is rotationally connected to the fixing frame.

5. The planetary gear mechanism according to any one of claims 1 to 4, characterized in that: The diameter of the primary gear is greater than the diameter of the secondary gear.

6. The planetary gear mechanism according to any one of claims 1 to 4, characterized in that: One of the primary gear and the secondary gear is a spur gear, and the other is a helical gear.

7. The planetary gear mechanism according to any one of claims 1 to 4, characterized in that: The planetary gear mechanism further comprises a bottom shell; the inner gear ring and the bottom shell are an integrated structure.

8. A grinding device, characterized in that: It comprises a grinding assembly, a power element and a planetary gear mechanism according to any one of claims 1 to 5, wherein the grinding assembly is force-transmittingly connected to the output portion of the planetary gear mechanism, and the power element is force-transmittingly connected to the sun gear of the planetary gear mechanism.

9. The grinding device according to claim 8, characterized in that: Along the axial direction of the sun gear, the power element is closer to the secondary gear of the planetary gear mechanism than the sun gear.

10. The grinding device according to claim 8 or 9, characterized in that: The grinding assembly includes a first mounting portion, a first grinding portion and a second grinding portion that cooperates with the first grinding portion to achieve grinding; one of the first grinding portion and the second grinding portion is force-transmittingly connected to the output portion; and the planetary gear mechanism is mounted on the first mounting portion.

11. The grinding device according to claim 10, characterized in that: The first mounting portion is a hollow lower shell, the fixing frame is located in the cavity of the lower shell, and the fixing frame is rotatably connected to the first mounting portion via a bearing.

12. The grinding device according to claim 11, characterized in that: The grinding assembly further comprises a powder thrower connected to the output part for force transmission, the powder thrower is arranged below the first grinding part and the second grinding part, and the powder thrower, the first grinding part and the second grinding part are all located in the cavity of the lower shell; The grinding assembly also includes a powder blocking cover snap-connected to the lower shell, and the powder blocking cover is arranged in the cavity of the lower shell and located above the powder thrower.

13. The grinding device according to claim 10, characterized in that: The grinding device further includes a manipulation assembly, which includes a second mounting portion and an adjusting portion that are rotatably connected, the other of the first grinding portion and the second grinding portion is mounted on the second mounting portion, and the first mounting portion is threadedly connected to the adjusting portion.

14. The grinding device according to claim 8 or 9, characterized in that: The grinding device also includes a support assembly detachably connected to the grinding assembly; the support assembly includes a hollow support frame, a sleeve and an elastic member sleeved on the sleeve, and the support frame is provided with a mounting hole for mounting the sleeve and the elastic member.

15. A grinding device, characterized in that: A grinding device comprising the grinding device described in any one of claims 8 to 14.

16. The grinding device according to claim 15, characterized in that: The grinding device is a coffee grinder, a bean grinder or a powder grinder.

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