Multi-rotating-head working mechanism and electric tool with same

Abstract

The utility model discloses a working mechanism with multiple rotating heads, which solves the technical problems of low working efficiency and poor effect of an electric tool with a single working head in the prior art. The multi-rotating-head working mechanism comprises a driver, a plurality of rotating heads and a planetary gear assembly, the planetary gear assembly comprises a main shaft, a planet carrier, a plurality of planetary gears, a plurality of rotating shafts and fixedly-arranged meshing units, the rotating shafts are rotatably arranged on the planet carrier, and the meshing units are fixedly arranged on the main shaft. The planetary gears, the rotating shaft and the rotating head rotate synchronously, the rotating head is arranged below the planet carrier, the driver is in transmission connection with the main shaft, the planet carrier is installed on the main shaft and rotates synchronously with the main shaft, and the meshing unit is meshed with the multiple planetary gears. And the planet carrier rotates to drive the plurality of planet gears to revolve around the axis of the main shaft and enable the plurality of planet gears to rotate around the axis of the rotating shaft. The utility model further provides an electric tool which adopts the multi-rotating-head working mechanism in the technical scheme.

Description

Technical Field

[0001] The utility model relates to the field of electric tools, in particular to an electric tool adopting a multi-rotating head working mechanism. Background Art

[0002] Power tools are tools that can convert electrical energy into mechanical energy, usually using motors as the power source. Compared with traditional hand tools, power tools have many advantages such as high efficiency, precision, and labor saving. They can greatly improve the efficiency and quality of production work, thereby liberating productivity. Using power tools can reduce people's physical burden, speed up the work process, and improve productivity.

[0003] Electric tools that clean or grind workpieces or object surfaces through a rotating head working mechanism, such as cleaning brushes and grinders, have been widely used in many industries and have improved people's work efficiency.

[0004] In the prior art, electric tools using a rotating head working mechanism are often only equipped with a single rotating working head, but the working efficiency of the single rotating working head is low, and the working effect is not ideal, and the operator is often required to operate repeatedly, which is very laborious. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and propose a multi-rotating head working mechanism and an electric tool having the same, so as to solve the problems of low working efficiency and unsatisfactory working effect of a single rotating working head in the prior art.

[0006] In order to achieve the above technical objectives, the multi-rotating head working mechanism proposed in the utility model includes a driver, multiple rotating heads and a planetary gear assembly, the planetary gear assembly includes a main shaft, a planetary carrier, multiple planetary gears, multiple rotating shafts and a fixedly arranged meshing unit, the multiple rotating shafts are rotatably arranged on the planetary carrier, the planetary gears, the rotating shafts and the rotating heads rotate together, the rotating head is arranged under the planetary carrier, the driver is connected to the main shaft in a transmission manner, the planetary carrier is installed on the main shaft and rotates together with it, the meshing unit meshes with the multiple planetary gears, and the rotation of the planetary carrier drives the multiple planetary gears to revolve around the axis of the main shaft and makes the multiple planetary gears rotate around the axis of the rotating shaft.

[0007] Preferably, the meshing unit includes a sun gear portion, which is hollow, and the main shaft passes through the hollow portion of the sun gear portion and is fixedly connected to the planet carrier, and the plurality of planetary gears circumferentially surround the outer side of the sun gear portion and mesh with it.

[0008] More preferably, the planetary gear assembly further comprises an inner ring gear, which circumferentially surrounds the outer side of the planetary gear and meshes with the planetary gear, and the inner ring gear is rotatable relative to the planet carrier.

[0009] Preferably, the meshing unit comprises an inner tooth portion, which is annular and has teeth on which protrude inwardly toward the planetary gears. The inner tooth portion circumferentially surrounds the outer sides of the plurality of planetary gears and meshes with the plurality of planetary gears.

[0010] More preferably, the planetary gear assembly further comprises a sun gear, which is rotatably sleeved on the main shaft, and the plurality of planetary gears circumferentially surround the outer side of the sun gear and mesh with it.

[0011] Preferably, the planetary gear assembly further comprises a balancing frame, which is arranged at one end of the planetary gear away from the planetary carrier, and the balancing frame and the planetary carrier respectively act on two ends of the rotation axis of the planetary gear to balance the force on the planetary gear.

[0012] Preferably, a limiting portion is provided on the rotating shaft, and a mounting hole is provided on the planet carrier, and the mounting hole restricts the limiting portion from passing in a direction away from the rotating head.

[0013] Preferably, the driver comprises a driving shaft, and the driving shaft and the main shaft have an included angle transmission, and the included angle is α, 90°≤α≤180°.

[0014] The utility model also proposes an electric tool, comprising a housing, a power supply device, and a multi-rotating head working mechanism as described in any of the above technical solutions, wherein the multi-rotating head working mechanism is installed in the housing, and the power supply device is electrically connected to the multi-rotating head working mechanism.

[0015] Preferably, one of the engagement unit and the shell is provided with an inserting portion, and the other of the two is correspondingly provided with an inserting slot, and the inserting portion is inserted into the inserting slot to fix the engagement unit in the shell.

[0016] After adopting the above technical solution, the utility model has the following beneficial effects.

[0017] 1. The multi-rotating head working mechanism proposed by the utility model has a driver driving the main shaft to rotate, thereby driving the planetary frame to rotate, and the planetary gears are arranged on the planetary frame to drive the rotating head to revolve along with the rotation of the planetary frame, and the planetary gears are meshed with the fixed meshing unit to drive the rotating head to rotate. With such a configuration, the multiple rotating heads on the multi-rotating head working mechanism can revolve around the axis of the main shaft and rotate around the axis of the rotating shaft at the same time, thereby improving the cleaning or grinding ability of the rotating working mechanism.

[0018] 2. The meshing unit includes a sun gear portion, which meshes with the planetary gear. With this arrangement, the meshing unit can be arranged in the central area of ​​the planetary gear assembly, and its radial dimension is smaller, its weight is lighter, and it is easier to obtain sufficient structural strength, thereby reducing the cost of the planetary gear assembly.

[0019] 3. The planetary gear assembly also includes a movable inner ring gear, which circumferentially surrounds the outer side of the planetary gear and meshes with the planetary gear, thereby balancing the force on the rotating shaft when the planetary carrier rotates, thereby ensuring good meshing of the planetary gear and the meshing unit; the force balance of the planetary gear also balances the force on the rotating shaft, avoiding lateral force on the planetary carrier when the rotating shaft is unbalanced and torsional, thereby reducing the thickness of the planetary carrier and saving material for the planetary carrier.

[0020] 4. The meshing unit includes an internal tooth portion, which meshes with the planetary gear. With this arrangement, the meshing unit can be arranged into a hollow structure without making room for an additional design of the main shaft, thereby simplifying the difficulty of design and enabling multiple rotating heads to simultaneously revolve around the axis of the main shaft and rotate around the axis of the rotating shaft.

[0021] 5. The planetary gear assembly also includes a movable sun gear. The planetary gear circumferentially surrounds the outside of the sun gear and meshes with the sun gear, thereby balancing the force on the rotating shaft when the planetary carrier rotates, thereby ensuring good meshing of the planetary gear and the meshing unit; the force balance of the planetary gear also balances the force on the rotating shaft, avoiding lateral force on the planetary carrier when the rotating shaft is unbalanced and torsional, thereby reducing the thickness of the planetary carrier and saving material for the planetary carrier.

[0022] 6. The planetary gear assembly also includes a balance frame, on which the rotating shaft or the planetary gear is rotatably mounted, so as to balance the force on the planetary gear when the planetary frame rotates, thereby ensuring good meshing of the planetary gear and the meshing unit; the force balance of the planetary gear also balances the force on the rotating shaft, avoiding lateral force on the planetary frame when the rotating shaft is unbalanced and torsional, thereby reducing the thickness of the planetary frame and saving material for the planetary frame.

[0023] 7. When the rotating head is working, the operator needs to press down on the power tool. The rotating head moves toward the planetary carrier under the reaction force. The mounting holes on the planetary carrier limit the passage of the rotating shaft, thereby preventing the rotating shaft or planetary gear from going too deep into the planetary gear assembly under the action of the rotating head, thereby protecting the planetary gear assembly and the working mechanism of the multi-rotating head.

[0024] 8. The driver includes a driving shaft, and the driving shaft and the main shaft have an angle transmission, the angle is α, 90°≤α≤180°. Such an arrangement can reduce the longitudinal or lateral dimensions of the multi-rotating head working mechanism.

[0025] 9. The electric tool proposed in the utility model adopts the multi-rotating head working mechanism described in any of the above technical solutions, so the electric tool has all the technical effects of the above multi-rotating head working mechanism.

[0026] 10. One of the meshing unit and the shell is provided with a plug-in portion, and the other is correspondingly provided with a plug-in slot, and the plug-in portion is plugged into the plug-in slot. With this arrangement, the shell can sufficiently fix the meshing unit, and at the same time, the meshing unit is easier to disassemble relative to the shell.

[0027] These features and advantages of the present invention will be disclosed in detail in the following specific implementation manners and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the working mechanism and housing of the multi-rotating head in the first and seventh embodiments of the present utility model;

[0029] Figure 2 It is a right side view of the multi-rotating head working mechanism in the first, fifth and seventh embodiments of the present utility model;

[0030] Figure 3 It is a cross-sectional view of the multi-rotating head working mechanism in the first embodiment of the utility model;

[0031] Figure 4 It is a schematic diagram of the meshing unit in the first embodiment of the utility model;

[0032] Figure 5 This is a schematic diagram of a balancing frame in Embodiment 5 of the present utility model;

[0033] Figure 6 It is a schematic diagram of a meshing unit with a sun gear portion and an inner gear ring in the third embodiment of the present utility model;

[0034] Figure 7 It is a schematic diagram of a meshing unit with an internal tooth portion in the second embodiment of the present utility model;

[0035] Figure 8 It is a schematic diagram of a meshing unit with an internal tooth portion and a sun gear in a fourth embodiment of the present utility model;

[0036] Fig. 9 It is a schematic diagram of a meshing unit with an internal tooth portion and a balancing frame in a fifth embodiment of the present invention;

[0037] Fig.10 It is a schematic diagram of a meshing unit with a sun gear portion, an inner gear ring and a balancing frame in a sixth embodiment of the present utility model;

[0038] Fig.11 It is a schematic diagram of a meshing unit with an internal tooth portion, a sun gear and a balancing frame in a sixth embodiment of the present utility model;

[0039] Reference numerals:

[0040] 100, housing, 110, driver, 111, first bevel gear, 120, rotating head;

[0041] 200, planetary gear assembly, 210, main shaft, 211, second bevel gear, 220, planet carrier, 221, mounting hole, 230, planetary gear, 240, meshing unit, 241, sun gear portion, 242, plug-in portion, 243, internal gear portion, 250, rotating shaft, 251, limiting portion, 260, balancing frame, 261, sun gear, 262, inner ring gear. DETAILED DESCRIPTION

[0042] The multi-rotating head working mechanism proposed in the utility model includes a driver, multiple rotating heads and a planetary gear assembly. The planetary gear assembly includes a main shaft, a planetary frame, multiple planetary gears, multiple rotating shafts and a fixedly arranged meshing unit. The multiple rotating shafts are rotatably arranged on the planetary frame. The planetary gears, the rotating shafts and the rotating heads rotate together. The rotating head is arranged below the planetary frame. The driver is connected to the main shaft in a transmission manner. The planetary frame is installed on the main shaft and rotates together with it. The meshing unit meshes with the multiple planetary gears. The rotation of the planetary frame drives the multiple planetary gears to revolve around the axis of the main shaft and makes the multiple planetary gears rotate around the axis of the rotating shaft. The multiple rotating heads on the multi-rotating head working mechanism of the utility model can simultaneously revolve around the axis of the main shaft and rotate around the axis of the rotating shaft, thereby improving the working capacity of the multiple rotating heads installed on the rotating working mechanism.

[0043] The following is an explanation and description of the technical scheme of the embodiment of the utility model in conjunction with the drawings of the embodiment of the utility model, but the following embodiment is only a preferred embodiment of the utility model, not all. Based on the embodiment in the implementation mode, other embodiments obtained by those skilled in the art without creative work are all within the protection scope of the utility model.

[0044] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "clockwise", "counterclockwise" and the like 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 invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0045] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, unless otherwise specified, "multiple" and "several" mean two or more, unless otherwise clearly defined.

[0046] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0047] 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 creative work are within the scope of protection of this application.

[0048] Embodiment 1:

[0049] like Figure 1 to Figure 2 As shown, the electric tool proposed in the embodiment of the utility model includes a multi-rotating head working mechanism, a housing 100 and a power supply device, wherein the multi-rotating head working mechanism is installed in the housing 100, and the power supply device is electrically connected to the multi-rotating head working mechanism to provide the power required for the multi-rotating head working mechanism to work. The power supply device can be a battery pack or a mains power connector.

[0050] The multi-rotating head working mechanism includes a driver 110, a plurality of rotating heads 120 and a planetary gear assembly 200, and the driver 110 and the planetary gear assembly 200 are installed in the housing 100 of the power tool. The planetary gear assembly 200 includes a main shaft 210, a planetary carrier 220, a plurality of planetary gears 230 and a fixedly arranged meshing unit 240. A plurality of rotating shafts 250 are rotatably arranged on the planetary carrier 220, and the number of the rotating shafts 250, the planetary gears 230 and the rotating heads 120 corresponds. The planetary gears 230, the rotating shafts 250 and the rotating heads 120 rotate together, the rotating heads 120 are arranged below the planetary carrier 220, and the plurality of planetary gears 230 are arranged on the same side of the planetary carrier 220. The meshing unit 240 is fixed in the housing 100 and meshes with the plurality of planetary gears 230. The driver 110 is connected to the main shaft 210 to drive the main shaft 210 to rotate. The planet carrier 220 is installed on the main shaft 210 and rotates with it. The rotation of the planet carrier 220 drives the multiple planetary gears 230 to revolve around the axis of the main shaft 210 and makes the planetary gears 230 rotate around the axis of the rotating shaft 250.

[0051] The rotation of the planetary gear drives the rotating head 120 to rotate, so that the multiple rotating heads 120 rotate and work. Among them, working accessories can be installed on the multiple rotating heads 120.

[0052] Exemplarily, the electric tool is a cleaning brush, and the rotating head 120 can be equipped with working accessories such as a cleaning brush, a sponge brush, a scouring pad, etc.

[0053] Exemplarily, the electric tool is a grinder, and the rotating head 120 can be equipped with working accessories such as a grinding sheet, a polishing sheet, a sponge sheet, a wool felt, etc. for grinding.

[0054] The electric tool may also be other equipment or devices that perform work by rotating a working accessory, such as a polisher, a grinder, etc.

[0055] In this embodiment, if Figures 1 to 3 As shown, a plurality of planetary gears 230 are installed above the planetary frame 220 , a plurality of rotating heads 120 are installed below the planetary frame 220 , and the planetary gears 230 and the rotating heads 120 are installed on both sides of the rotating shaft 250 , respectively.

[0056] In some other embodiments, a plurality of planetary gears 230 are installed under the planetary frame 220, the rotating head 120 is installed under the planetary gears 230, and one end of the rotating shaft 250 passes through the planetary frame 220 in a direction away from the rotating head 120. It is understandable that the rotating head 120 can be installed under the planetary gears 230 through the rotating shaft 250, or can be installed on a downwardly protruding shaft provided on the planetary gears 230 to be installed under the planetary gears 230.

[0057] One end of the rotating shaft 250 away from the rotating head 120 is limited on the planetary gear 230 or the planetary carrier 220 to prevent the rotating shaft 250 from sliding down.

[0058] Exemplarily, a snap-fit ​​groove is provided on the rotating shaft 250 , and the rotating shaft 250 is limited on the planetary gear 230 or the planetary carrier 220 by a snap spring.

[0059] The rotating shaft 250 and the planetary gear 230 or the rotating head 120 can be connected through a keyway structure to achieve simultaneous rotation, and can be fixedly installed by means of screws, riveting, bonding, clamping, etc.

[0060] It is understandable that the rotating shaft 250 may also be integrally formed on one of the planetary gear 230 and the rotating head 120 , and rotate together and be fixedly installed with the other of the two in the above-mentioned manner.

[0061] In this embodiment, if Figures 1 to 3 As shown, the meshing unit 240 includes a sun gear portion 241, the sun gear portion 241 is hollow, the main shaft 210 passes through the hollow part of the sun gear portion 241 and is fixedly connected to the planet carrier 220, and a plurality of planetary gears 230 circumferentially surround the outside of the sun gear portion 241 and mesh with the sun gear portion 241. The planet carrier 220 drives the planetary gears 230 to revolve around the axis of the main shaft 210 in a first direction, and the planetary gears 230 mesh with the sun gear portion 241 and rotate around the axis of the rotating shaft 250 in the first direction.

[0062] In this way, the meshing unit 240 is disposed at the central area of ​​the planetary gear assembly 200 , and has a smaller radial dimension, lighter weight, and is easier to obtain sufficient structural strength, thereby reducing the cost of the planetary gear assembly 200 .

[0063] In one embodiment, Figure 1 , Figure 2 , Figure 4 As shown, the meshing unit 240 also includes a plug-in portion 242, and a plug-in slot is correspondingly provided on the shell 100. The shape of the plug-in portion 242 is adapted to the plug-in slot. The plug-in portion 242 is plugged into the plug-in slot to fix the meshing unit 240 in the shell 100, so that the meshing unit 240 cannot rotate relative to the shell 100.

[0064] In some other embodiments, the housing 100 may be provided with an inserting portion 242 , and the engaging unit 240 may be provided with an inserting groove.

[0065] With such a configuration, the housing 100 can sufficiently fix the engaging unit 240 , and at the same time, the engaging unit 240 can be more easily disassembled relative to the housing 100 .

[0066] In some other embodiments, the engagement unit 240 and the housing 100 may also be fixedly connected by means of screws, clamping, bonding, riveting, etc.

[0067] The planet carrier 220 is provided with mounting holes 221 corresponding to the plurality of rotating shafts 250 . Bearings or sleeves are provided in the mounting holes. The rotating shafts 250 are mounted in the mounting holes so as to be rotatable relative to the planet carrier 220 .

[0068] like Figure 3 As shown, in one embodiment, a limiting portion 251 is provided on the rotating shaft 250, and the mounting hole 221 limits the limiting portion 251 from passing in a direction away from the rotating head 120. Specifically, the limiting portion 251 can be a limiting boss provided on the rotating shaft 250, or a bearing or a sleeve tightly mounted on the rotating shaft 250, and the diameter of the mounting hole 221 is smaller than the cross-sectional size of the limiting portion 251.

[0069] When the rotating head 120 is working, the operator needs to press down and apply force on the power tool. The rotating head 120 moves toward the planetary carrier 220 under the action of the reaction force. The mounting hole 221 on the planetary carrier 220 limits the passage of the rotating shaft 250, thereby preventing the rotating shaft 250 or the planetary gear 230 from being too deep into the planetary gear assembly 200 under the action of the rotating head 120, thereby protecting the planetary gear assembly 200 and the multi-rotating head working mechanism.

[0070] Embodiment 2:

[0071] Different from the first embodiment, Figure 7 As shown, in this embodiment, the meshing unit 240 includes an inner tooth portion 243. The inner tooth portion 243 is annular and the teeth thereon protrude inwardly toward the direction of the planetary gears 230. The inner tooth portion 243 circumferentially surrounds the outer sides of the plurality of planetary gears 230 and meshes with the plurality of planetary gears 230. The planet carrier 220 drives the planetary gears 230 to revolve around the axis of the main shaft 210 in the first direction, and the planetary gears 230 mesh with the inner tooth portion 243 and rotate around the axis of the rotating shaft 250 in the first direction.

[0072] In this way, the meshing unit 240 can be configured as a hollow structure without making room for the main shaft 210, simplifying the design difficulty and enabling multiple rotating heads 120 to simultaneously revolve around the axis of the main shaft 210 and rotate around the axis of the rotating shaft 250.

[0073] For other contents not described in this embodiment, please refer to Embodiment 1.

[0074] Embodiment three:

[0075] Based on the first embodiment, Figure 6As shown, in the present embodiment, the planetary gear assembly 200 further includes an auxiliary balancing unit, which and the planet carrier 220 act on the two ends of the rotation axis of the planetary gear 230 respectively to balance the force on the planetary gear 230, thereby ensuring good meshing between the planetary gear 230 and the meshing unit 240; the force balance of the planetary gear 230 also balances the force on the rotating shaft 250, thereby avoiding lateral force on the planet carrier 220 when the rotating shaft 250 is unbalanced and torsional, thereby reducing the thickness of the planet carrier 220, thereby saving the material of the planet carrier 220.

[0076] The meshing unit 240 includes a sun gear 241, and the auxiliary balancing unit is an inner gear ring 262. The inner gear ring 262 surrounds the outer side of the planetary gear 230 in a circumferential direction and meshes with the planetary gear 230, and the inner gear ring 262 can rotate relative to the planetary carrier 220. When the planetary carrier 220 rotates, the planetary gear 230 rotates with the planetary carrier 220, and both sides of the planetary gear 230 mesh with the sun gear 241 and the inner gear ring 262 at the same time, so as to balance the forces on each planetary gear 230, and the planetary gear 230 is more stable during the rotation process and is not easy to tilt during operation, thereby ensuring good meshing between the planetary gear 230 and the meshing unit 240.

[0077] For other contents not described in this embodiment, reference may be made to the above embodiments.

[0078] Embodiment 4:

[0079] Based on the second embodiment, Figure 8 As shown, in the present embodiment, the planetary gear assembly 200 further includes an auxiliary balancing unit, which and the planet carrier 220 act on the two ends of the rotation axis of the planetary gear 230 respectively to balance the force on the planetary gear 230, thereby ensuring good meshing between the planetary gear 230 and the meshing unit 240; the force balance of the planetary gear 230 also balances the force on the rotating shaft 250, thereby avoiding lateral force on the planet carrier 220 when the rotating shaft 250 is unbalanced and torsional, thereby reducing the thickness of the planet carrier 220, thereby saving the material of the planet carrier 220.

[0080] The meshing unit 240 includes an inner tooth portion 243, and the auxiliary balancing unit is a sun gear 261, which is rotatably sleeved on the main shaft 210, and the plurality of planetary gears 230 circumferentially surround the outer side of the sun gear 261 and mesh with it. When the planet carrier 220 rotates, the planetary gears 230 rotate with the planet carrier 220, and both sides of the planetary gears 230 mesh with the inner tooth portion 243 and the sun gear 261 at the same time, so as to balance the forces on each planetary gear 230, and the planetary gears 230 are more stable during the rotation process, and are not easy to tilt during operation, thereby ensuring good meshing between the planetary gears 230 and the meshing unit 240.

[0081] A bearing or a sleeve may be provided between the sun gear 261 and the main shaft 210 to reduce the sliding friction between the two. The sun gear 261 may also be suspended relative to the main shaft 210, and the plurality of planetary gears 230 mesh with the sun gear 261 to balance the circumferential force of the sun gear 261, so that the sun gear 261 is suspended and sleeved on the main shaft 210.

[0082] For other contents not described in this embodiment, reference may be made to the above embodiments.

[0083] Embodiment five:

[0084] Based on the first and second embodiments, in the present embodiment, the planetary gear assembly 200 further includes an auxiliary balancing unit, which and the planetary carrier 220 act on the two ends of the rotation axis of the planetary gear 230 respectively to balance the force on the planetary gear 230, thereby ensuring good meshing between the planetary gear 230 and the meshing unit 240; the force balance of the planetary gear 230 also balances the force on the rotating shaft 250, thereby avoiding lateral force on the planetary carrier 220 when the rotating shaft 250 is unbalanced and torsional, thereby reducing the thickness of the planetary carrier 220 and saving the material of the planetary carrier 220.

[0085] In this embodiment, if Figure 2 , Figure 5 , Fig. 9 As shown, the auxiliary balancing unit is a balancing frame 261 , and the balancing frame 261 is disposed at one end of the planetary gear 230 away from the planetary frame 220 .

[0086] In one embodiment, one end of the rotating shaft 250 away from the rotating head 120 passes through the planetary gear 230 and is rotatably mounted on the balance frame 261. The balance frame 261 is provided with a plurality of through holes corresponding to the rotating shaft 250. The rotating shaft 250 passes through one end of the planetary gear 230 and is rotatably mounted in the through hole of the balance frame 261 and extends out of the through hole. The extended portion is limited by a retaining spring. When the planetary frame 220 rotates, the rotating shaft 250 drives the balance frame 261 to rotate together with the planetary frame 220. One end of each rotating shaft 250 is rotationally limited on the planetary frame 220, and the other end is rotationally limited on the balance frame 261, so as to balance the forces on each planetary gear 230. The planetary gear 230 is more stable during the rotation process and is not prone to tilting, thereby ensuring good meshing between the planetary gear 230 and the meshing unit 240.

[0087] In another embodiment, the planetary gear 230 is rotatably mounted on the balance frame 261. A convex shaft is convexly provided on the side of the planetary gear 230 away from the planetary frame 220, and a plurality of through holes corresponding to the convex shaft are provided on the balance frame 261. The convex shaft is rotatably mounted in the through hole of the balance frame 261 and extends out of the through hole, and the extended part is limited by a retaining spring. One end of the rotating shaft 250 is rotationally limited on the planetary frame 220, and the other end is mounted on the planetary gear 230. The rotation axis of the convex shaft and the rotating shaft 250 are on the same axis. When the planetary frame 220 rotates, the planetary gear 230 drives the balance frame 261 to rotate with the planetary frame 220, and the convex shaft and the rotating shaft 250 rotate on the same axis, thereby balancing the forces on each planetary gear 230, and the planetary gear 230 is more stable during the movement and is not easy to tilt, thereby ensuring good meshing between the planetary gear 230 and the meshing unit 240.

[0088] By providing a balance frame 261 in the planetary gear assembly 200, and the planetary frame 220 and the balance frame 261 respectively act on the two ends of the rotation axis of the planetary gear 230 to balance the force of the planetary gear 230, so that the rotation of the planetary gear 230 is more stable when the multi-rotating head working mechanism is working; the force balance of the planetary gear 230 also balances the force of the rotating shaft 250, avoiding the lateral force on the planetary frame 220 when the rotating shaft 250 is unbalanced and torsional, thereby reducing the thickness of the planetary frame 220, thereby saving the material of the planetary frame 220.

[0089] For other contents not described in this embodiment, reference may be made to the above embodiments.

[0090] Embodiment six:

[0091] Based on the third and fourth embodiments, Fig.10 , 11 As shown, in this embodiment, the auxiliary balancing unit also includes a balancing frame 261, and the balancing frame 261 and the planetary frame 220 act on both ends of the rotation axis of the planetary gear 230 to balance the force of the planetary gear 230 and ensure better meshing between the planetary gear 230 and the meshing unit 240.

[0092] For other contents not described in this embodiment, reference may be made to the above embodiments.

[0093] Embodiment seven:

[0094] Based on the above embodiments, Figure 1 to Figure 2 As shown, in this embodiment, the driver 110 includes a driving shaft, and the driving shaft and the main shaft 210 have an angle transmission, the angle is α, 90°≤α≤180°. Such an arrangement can reduce the longitudinal or lateral dimensions of the multi-rotating head working mechanism.

[0095] In some embodiments, the driver 110 includes a motor, and the rotating shaft of the motor is a driving shaft.

[0096] In some other embodiments, the driver 110 includes a motor and a transmission assembly, the rotating shaft of the transmission assembly is a driving shaft, and the motor drives the transmission assembly to rotate so that the driving shaft rotates with a reduction ratio. The transmission assembly can be a gear set, and preferably, the transmission assembly is a planetary gear assembly.

[0097] In one embodiment, Figure 1 , Figure 2 As shown, a first bevel gear 111 is provided on the driving shaft, a second bevel gear 211 is provided on the main shaft 210, and the first bevel gear 111 meshes with the second bevel gear 211 to achieve transmission with an included angle. The transmission with an included angle achieved by bevel gears has the advantages of high transmission accuracy, good transmission efficiency, stable transmission, and strong load-bearing capacity.

[0098] In this embodiment, the tooth profiles of the first bevel gear 111 and the second bevel gear 211 are helical teeth or arc teeth, which can reduce the noise generated when the tooth surfaces are meshed, improve the transmission stability, transmission load-bearing capacity and the service life of the gears.

[0099] Preferably, in this embodiment, the axis angle between the first bevel gear 111 and the second bevel gear 211 is 90°, and the drive shaft and the main shaft 210 are driven at right angles.

[0100] In another embodiment, the drive shaft and the main shaft 210 are driven by a universal joint, thereby achieving a transmission with an angle between the two.

[0101] In another embodiment, the drive shaft and the main shaft 210 are driven by a coupling, thereby achieving a transmission with an angle of 180° between the two.

[0102] In another embodiment, the drive shaft and the main shaft 210 are driven by a worm gear, thereby achieving a transmission with an included angle between the two.

[0103] In some other embodiments, the drive shaft and the main shaft 210 may also be transmitted through gear meshing, belt pulleys, gear meshing chains, etc.

[0104] It should be noted that a bearing or a sleeve is disposed between the rotating shaft 250 and the planetary carrier 220 . Such a configuration can reduce the friction between the rotating shaft 250 and the planetary carrier 220 , thereby increasing the service life of the rotating shaft 250 .

[0105] It should be noted that a bearing or a sleeve is also provided between the main shaft 210 and the meshing unit 240 . Such a configuration can reduce the friction when the main shaft 210 rotates relative to the meshing unit 240 , thereby increasing the service life of the main shaft 210 .

[0106] The above is only a specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Those skilled in the art should understand that the utility model includes but is not limited to the contents described in the drawings and the above specific implementation. Any modification that does not deviate from the functional and structural principles of the utility model will be included in the scope of the claims.

Claims

1. Multi-rotating head working mechanism, characterized in that: It includes a driver, multiple rotating heads and a planetary gear assembly, wherein the planetary gear assembly includes a main shaft, a planetary carrier, multiple planetary gears, multiple rotating shafts and a fixedly arranged meshing unit, wherein the multiple rotating shafts are rotatably arranged on the planetary carrier, and the planetary gears, the rotating shafts and the rotating heads rotate together, and the rotating head is arranged below the planetary carrier. The driver is connected to the main shaft in a transmission manner, and the planetary carrier is installed on the main shaft and rotates together with it, and the meshing unit meshes with the multiple planetary gears. The rotation of the planetary carrier drives the multiple planetary gears to revolve around the axis of the main shaft and causes the multiple planetary gears to rotate around the axis of the rotating shaft.

2. The multi-rotating head working mechanism according to claim 1, characterized in that: The meshing unit comprises a sun gear portion, which is hollow. The main shaft passes through the hollow portion of the sun gear portion and is fixedly connected to the planet carrier. The plurality of planetary gears circumferentially surround the outer side of the sun gear portion and mesh with the sun gear portion.

3. The multi-rotating head working mechanism according to claim 2, characterized in that: The planetary gear assembly further includes an inner gear ring, which circumferentially surrounds the outer side of the planetary gear and meshes with the planetary gear. The inner gear ring is rotatable relative to the planet carrier.

4. The multi-rotating head working mechanism according to claim 1, characterized in that: The meshing unit comprises an inner tooth portion, which is annular and has teeth on which protrude inwardly toward the planetary gears. The inner tooth portion circumferentially surrounds the outer sides of a plurality of planetary gears and meshes with the plurality of planetary gears.

5. The multi-rotating head working mechanism according to claim 4, characterized in that: The planetary gear assembly also includes a sun gear, which is rotatably sleeved on the main shaft, and a plurality of planetary gears circumferentially surround the outer side of the sun gear and mesh with it.

6. The multi-rotating head working mechanism according to claim 1, characterized in that: The planetary gear assembly further includes a balancing frame, which is arranged at one end of the planetary gear away from the planetary frame. The balancing frame and the planetary frame act on two ends of the rotation axis of the planetary gear respectively to balance the force on the planetary gear.

7. The multi-rotating head working mechanism according to claim 1, characterized in that: The rotating shaft is provided with a limiting portion, and the planet carrier is provided with a mounting hole, and the mounting hole restricts the limiting portion from passing in a direction away from the rotating head.

8. The multi-rotating head working mechanism according to claim 1, characterized in that: The driver comprises a driving shaft, and the driving shaft and the main shaft have an included angle transmission, and the included angle is α, 90°≤α≤180°.

9. An electric tool, comprising a housing and a power supply device, characterized in that: It also includes a multi-rotation head working mechanism as claimed in any one of claims 1 to 8, wherein the multi-rotation head working mechanism is installed in the housing, and the power supply device is electrically connected to the multi-rotation head working mechanism.

10. The electric tool according to claim 9, characterized in that: One of the meshing unit and the shell is provided with an inserting portion, and the other of the two is correspondingly provided with an inserting slot, and the inserting portion is inserted into the inserting slot to fix the meshing unit in the shell.

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