CN116317303A - Power motor for weeding machine - Google Patents

Abstract

The invention relates to the field of motors and discloses a power motor for a weeding machine, which comprises a motor shell and a motor shaft rotatably arranged on the motor shell, wherein the rear end of the motor shell is provided with a plurality of groups of heat dissipation ports communicated with the interior of the motor shell, the heat dissipation ports are arranged in an annular array structure, and the motor also comprises a plugging mechanism and a centrifugal transmission mechanism which are arranged at the rear end of the motor shell; the plugging mechanism comprises a plurality of plugging components, the plugging components are arranged in an annular array structure, each plugging component corresponds to one group of heat dissipation ports, the plugging components are slidably mounted on the rear end face of the motor shell, and the plugging components can plug/open the heat dissipation ports. According to the invention, the plugging mechanism and the centrifugal transmission mechanism are arranged, so that when the motor is started, the heat dissipation opening can be opened by utilizing the rotary motion of the motor shaft, and when the motor is powered off, the heat dissipation opening can be automatically closed, the purpose of heat dissipation of the motor can be achieved, and the influence of external impurities on the motor can be reduced.

Description

Power motor for weeding machine

Technical Field

The invention relates to the technical field of motors, in particular to a power motor for a weeding machine.

Background

The motor is a core power element of the power type weeder. When the weeding machine works, the rotating speed of the motor is very high, and the motor can work continuously for a long time, so that the motor generates heat seriously, and the existing weeding machine has relatively poor motor heat dissipation effect.

In order to solve the problem, the patent application number 202120926082.8 discloses a novel weeder power motor, which comprises a bod, the organism bottom is equipped with the transmission shaft, the organism top is equipped with the top cap, top cap and organism pass through bolted connection together, the organism upper surface is even to be equipped with a plurality of installing ports, the inside ventilative board that installs through the bolt, organism arc surface is even to be equipped with a plurality of connecting pieces, connecting piece and organism pass through bolted connection together.

The heat dissipation opening and the ventilation plate are arranged on the motor, so that the motor can dissipate heat rapidly. But have impurity such as more dust, particulate matter in the operational environment of weeder, if the thermovent communicates motor inside and external world for a long time, the ventilative board of impurity jam easily to tiny impurity also gets into inside the motor through thermovent and ventilative board easily, leads to the motor to damage.

Disclosure of Invention

In view of the above, the present invention aims to provide a power motor for a weeding machine, which solves the problems that in the background art, if a heat dissipation port communicates the interior of the motor with the outside for a long time, impurities easily block a ventilation plate, and fine impurities easily enter the interior of the motor through the heat dissipation port and the ventilation plate, so that the motor is damaged.

The invention solves the technical problems by the following technical means:

the power motor for the weeding machine comprises a motor shell and a motor shaft rotatably arranged on the motor shell, wherein the rear end of the motor shell is provided with a plurality of groups of heat dissipation ports communicated with the interior of the motor shell, the heat dissipation ports are arranged in an annular array structure, and the motor further comprises a plugging mechanism and a centrifugal transmission mechanism which are arranged at the rear end of the motor shell; the plugging mechanism comprises a plurality of plugging components, the plugging components are arranged in an annular array structure, each plugging component corresponds to one group of heat dissipation ports, the plugging components are slidably mounted on the rear end face of the motor shell, and the plugging components can plug/open the heat dissipation ports; the centrifugal transmission mechanism comprises a connecting ring and a plurality of centrifugal motion components, wherein the connecting ring is fixed at the rear end of a motor shaft, the centrifugal motion components are arranged in an annular array structure and are connected to the connecting ring, the centrifugal motion components can drive the plugging components to open a heat dissipation opening when in centrifugal motion under the driving of the motor shaft, and the centrifugal motion components can drive the plugging components to plug the heat dissipation opening under the non-centrifugal motion state.

Further, the shutoff subassembly includes the shutoff board, offered the through-hole with the thermovent looks adaptation on the shutoff board, the one end of shutoff board is fixed with the sliding plate, offered the spout with the sliding plate looks adaptation on the rear end face of motor housing, the partial structure slidable mounting of sliding plate is in the spout, works as the sliding plate slides to being close to motor shaft one end along the motion track of spout, the shutoff board is with the thermovent shutoff completely, works as the sliding plate slides to keeping away from motor shaft one end along the motion track of spout, the through-hole and the thermovent coincidence of shutoff board will the thermovent is opened completely.

Further, the centrifugal motion assembly comprises a fixed rod, a centrifugal rod and a compression spring; one end of the fixed rod is fixed on the connecting ring; one end of the eccentric rod is provided with a blind hole, and one end of the fixed rod is arranged in the blind hole of the eccentric rod, so that the eccentric rod is arranged on the fixed rod in a sliding manner along the length direction of the eccentric rod; the compression spring is sleeved on the fixing rod, a first baffle is fixed at one end, far away from the connecting ring, of the fixing rod, a second baffle is fixed at the open end of the blind hole of the centrifugal rod, one end of the compression spring is propped against the first baffle, and the other end of the compression spring is propped against the second baffle.

Further, the centrifugal motion assembly further comprises a centrifugal transmission part, and the centrifugal transmission part is fixed on the centrifugal rod; the plugging assembly further comprises an arc-shaped plate, the arc-shaped plate is fixed at one end, far away from the plugging plate, of the sliding plate, arc-shaped grooves are formed in the arc-shaped plate, all the arc-shaped grooves of the arc-shaped plate jointly form a movement track, and part of the structure of the centrifugal transmission part is movably mounted in the movement track.

Further, the centrifugal transmission part comprises a connecting rod, one end of the connecting rod is fixed on the lower side of the centrifugal rod, the other end of the centrifugal rod is fixedly provided with a mounting rod, the lower side of the mounting rod is fixedly provided with a plurality of connecting shafts, the rotating wheel is rotatably mounted on the connecting shafts, the rotating wheel is movably mounted in a moving track, and the outer circumferential wall of the rotating wheel can be abutted against the side wall of the arc-shaped groove.

Further, the width of the arc-shaped groove is larger than the diameter of the rotating wheel, and the width of the inlet end and the outlet end of the arc-shaped groove is larger than the width of the middle part of the arc-shaped groove.

Further, the plugging mechanism further comprises a plurality of plugging transmission assemblies, each plugging transmission assembly is arranged between two adjacent plugging plates, each plugging transmission assembly comprises a first transmission gear and a second transmission gear, the first transmission gears and the second transmission gears are rotatably arranged on the rear end face of the motor shell, and the first transmission gears and the second transmission gears are meshed with each other; the two ends of the plugging plate are respectively fixed with a first transmission rack and a second transmission rack, the first transmission racks are meshed with the first transmission gears of the plugging transmission components on the same side of the first transmission racks, and the second transmission racks are meshed with the second transmission gears of the plugging transmission components on the same side of the second transmission racks.

Further, the centrifugal motion assembly further comprises fan blades, the fan blades are fixed on one end of the centrifugal rod, which is far away from the connecting ring, and the wind direction of the fan blades is from the front end of the motor to the rear end of the motor; the motor is characterized in that a plurality of radiating fins are fixed on the motor shell, a protective cover is sleeved outside the motor shell, the front end of the protective cover is open, and a plurality of ventilation holes are formed in the rear end of the protective cover.

Further, an air inlet dustproof net cover is arranged between the front end of the protective cover and the motor shell.

Further, the motor shell is provided with a heat dissipation dustproof net cover in each heat dissipation opening.

The invention has the beneficial effects that:

through the mutual matching of the plugging mechanism and the centrifugal transmission mechanism, when the motor is started to drive the motor shaft to rotate at a high speed, all centrifugal motion components can be driven by the connecting ring to perform centrifugal motion together, and then all plugging components are driven by centrifugal force generated by all centrifugal motion components to slide, so that all heat dissipation ports are opened, heat generated in the motor can be smoothly dissipated, and the heat dissipation performance of the motor is improved; when the motor shaft stops rotating, the centrifugal motion assembly is in a non-centrifugal motion state, and in the state, all the centrifugal motion assemblies can drive all the plugging assemblies to plug all the heat dissipation ports, so that part of impurities are prevented from entering the motor from the heat dissipation ports, and the risk of damage of the motor is reduced.

Drawings

FIG. 1 is a schematic diagram of a motor in an embodiment of the invention;

FIG. 2 is a schematic illustration of a motor with a shield removed in an embodiment of the invention;

FIG. 3 is an exploded view of a portion of the structure of FIG. 2 in accordance with the present invention;

FIG. 4 is a schematic view showing the rear end of the motor housing according to the embodiment of the present invention;

FIG. 5 is a schematic illustration of the structure of a closure assembly according to an embodiment of the present invention;

FIG. 6 is a schematic view of the structure of a centrifugal motion assembly in an embodiment of the invention;

FIG. 7 is a cross-sectional view of a centrifugal motion assembly in an embodiment of the invention;

FIG. 8 is a schematic diagram showing the engagement of the plugging assembly with the centrifugal motion assembly in accordance with an embodiment of the present invention;

fig. 9 is a schematic diagram showing a structure of a heat sink in an open state according to an embodiment of the present invention;

1, a motor shell; 11. a heat radiation port; 12. a heat-dissipation dust-proof net cover; 14. a chute; 15. a heat radiation fin; 2. a motor shaft; 3. a plugging assembly; 31. a plugging plate; 311. a through hole; 312. a first drive rack; 313. a second drive rack; 32. a sliding plate; 33. an arc-shaped plate; 331. an arc-shaped groove; 332. an inlet end; 333. an outlet end; 334. a middle part; 4. a connecting ring; 5. a centrifugal motion assembly; 51. a fixed rod; 511. a first baffle; 52. a centrifugal rod; 521. a blind hole; 522. a second baffle; 53. a compression spring; 54. a centrifugal transmission part; 541. a connecting rod; 542. a mounting rod; 543. a connecting shaft; 544. a rotating wheel; 55. fan blades; 6. plugging the transmission assembly; 61. a first transmission gear; 62. a second transmission gear; 7. a protective cover; 71. a vent hole; 8. an air inlet dustproof net cover.

Description of the embodiments

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

As shown in fig. 1 to 9, the embodiment of the application provides a power motor for a weeding machine, which not only has better heat dissipation performance, but also is difficult to invade the inside of the motor by external impurities, has better comprehensive performance and is suitable for the weeding machine.

As shown in fig. 3 and 4, in particular, the motor includes a motor housing 1 and a motor shaft 2 rotatably mounted on the motor housing 1, and in addition, the motor housing 1 also includes a stator, a rotor, and other components, which are not described in detail in this embodiment of the prior art. The rear end of the motor shell 1 is provided with a plurality of groups of heat dissipation ports 11, and the heat dissipation ports 11 can communicate the inside of the motor shell 1 with the outside, so that the rapid heat dissipation inside the motor is realized. In this embodiment, the number of the heat dissipation ports 11 is specifically five, the five heat dissipation ports 11 are arranged at the rear end of the motor housing 1 in an annular array structure, each heat dissipation port 11 includes two heat dissipation ports 11 in a rectangular structure, and the two heat dissipation ports 11 are arranged in parallel.

As shown in fig. 2 and 3, in this embodiment, the motor further includes a blocking mechanism and a centrifugal transmission mechanism, and the blocking mechanism is mainly used for blocking/opening all the heat dissipation ports 11. The centrifugal transmission mechanism mainly utilizes the high-speed rotation motion of the motor shaft 2 to perform centrifugal motion, and then utilizes the centrifugal force generated by the centrifugal motion to act on the plugging mechanism to control the plugging mechanism to open all the heat dissipation ports 11, and when the motor shaft 2 does not rotate, the centrifugal transmission mechanism does not generate centrifugal force, so that the plugging mechanism can be controlled to plug all the heat dissipation ports 11.

As shown in fig. 2, 3 and 9, specifically, the plugging mechanism includes a plurality of plugging components 3, the number of the plugging components 3 is specifically set up five, the five plugging components 3 are arranged in a ring array structure, each plugging component 3 corresponds to one group of heat dissipation openings 11, the plugging components 3 are slidably mounted on the rear end face of the motor housing 1, the sliding track of the plugging components 3 coincides with the extension line of the radius of the motor shaft 2, when the plugging components 3 slide to a certain position, the corresponding heat dissipation openings 11 can be plugged/opened, and the five plugging components 3 cooperate with each other, so that all the heat dissipation openings 11 can be plugged/opened together. The centrifugal transmission mechanism comprises a connecting ring 4 and a plurality of centrifugal motion components 5, wherein the connecting ring 4 is fixed at the rear end of the motor shaft 2, the motor shaft 2 drives the connecting ring 4 to rotate, the centrifugal motion components 5 are arranged in an annular array structure and are connected to the connecting ring 4, and the number of the centrifugal motion components 5 is greater than or equal to five. When the motor is started to drive the motor shaft 2 to rotate at a high speed, all the centrifugal motion assemblies 5 can be driven to do centrifugal motion together through the connecting ring 4, and then all the plugging assemblies 3 are driven to slide through the centrifugal force generated by all the centrifugal motion assemblies 5, so that all the heat dissipation ports 11 are opened, heat generated in the motor can be smoothly dissipated, and the heat dissipation performance of the motor is improved; when the motor shaft 2 stops rotating, the centrifugal motion assemblies 5 are in a non-centrifugal motion state, in this state, all the centrifugal motion assemblies 5 can drive all the plugging assemblies 3 to plug all the heat dissipation ports 11, so that part of impurities are prevented from entering the motor from the heat dissipation ports 11, and the risk of damage to the motor is reduced.

As shown in fig. 3 and 4, in the present embodiment, the motor housing 1 is provided with a heat radiation dust screen 12 in each heat radiation port 11. Through setting up like this, when motor work and make thermovent 11 by opening, also can reduce the inside condition of impurity entering motor, reduce the risk of motor damage.

As shown in fig. 4 and 5, in the present embodiment, the plugging assembly 3 includes a plugging plate 31, through holes 311 adapted to the heat dissipation openings 11 are formed in the plugging plate 31, the number of the through holes 311 is two, and the through holes 311 are both rectangular structures, the two rectangular through holes 311 respectively correspond to the two rectangular heat dissipation openings 11 in the group of heat dissipation openings 11, and the area of the through holes 311 may be slightly larger than the area of the heat dissipation openings 11. One end of the plugging plate 31 is fixed with a sliding plate 32, a sliding groove 14 matched with the sliding plate 32 is formed in the rear end face of the motor shell 1, the motion track of the sliding groove 14 coincides with the extension line of the radius of the motor shaft 2, part of the structure of the sliding plate 32 is slidably mounted in the sliding groove 14, and the sliding plate 32 can slide along the motion track of the sliding groove 14 to the end close to the motor shaft 2 or away from the end close to the motor shaft 2 through the position limitation of the sliding groove 14. When the sliding plate 32 slides along the movement track of the sliding groove 14 to a position close to one end of the motor shaft 2, the through hole 311 of the plugging plate 31 and the heat dissipation port 11 do not overlap, the plugging plate 31 can completely plug the heat dissipation port 11, and when the sliding plate 32 slides along the movement track of the sliding groove 14 to a position far away from one end of the motor shaft 2, the through hole 311 of the plugging plate 31 and the heat dissipation port 11 overlap, and the heat dissipation port 11 can be completely opened.

As shown in fig. 6 and 7, in the present embodiment, the centrifugal motion assembly 5 includes a fixed lever 51, a centrifugal lever 52, and a compression spring 53. One end of the fixing rod 51 is fixed to the connection ring 4, and the length direction of the fixing rod 51 coincides with an extension line of the radius of the motor shaft 2. One end of the eccentric rod 52 is provided with a blind hole 521, and the end of the fixing rod 51 remote from the connecting ring 4 is mounted in the blind hole 521 of the eccentric rod 52, so that the eccentric rod 52 is slidably mounted on the fixing rod 51 in its own length direction. The compression spring 53 is sleeved on the rod surface of the fixing rod 51 located in the blind hole 521, in order to facilitate installation of the compression spring 53, a first baffle 511 is fixed at one end of the fixing rod 51 away from the connecting ring 4, a second baffle 522 is fixed at the open end of the blind hole 521 of the eccentric rod 52, one end of the compression spring 53 abuts against the first baffle 511, and the other end of the compression spring 53 abuts against the second baffle 522. When the motor shaft 2 drives the connecting ring 4 to rotate at a high speed, all the centrifugal motion assemblies 5 also rotate at a high speed by taking the axis of the motor shaft 2 as a rotation center, and at the moment, under the action of centrifugal force, the centrifugal rod 52 overcomes the elastic force of the compression spring 53 and slides towards one end far away from the motor shaft 2 so as to perform centrifugal motion; when the motor shaft 2 does not drive the connecting ring 4 to rotate, all the centrifugal motion assemblies 5 do not do centrifugal motion, and at the moment, the centrifugal rod 52 moves towards one end close to the motor shaft 2 under the action of the elastic force of the compression spring 53, so that the centrifugal rod 52 is reset.

As shown in fig. 5, 6 and 8, in this embodiment, in order to enable all the centrifugal motion assemblies 5 to drive all the plugging assemblies 3 together, the centrifugal motion assemblies 5 further include a centrifugal transmission portion 54, and the centrifugal transmission portion 54 is fixed on the centrifugal rod 52 and can perform centrifugal motion along with the centrifugal rod 52. The plugging assembly 3 further comprises an arc-shaped plate 33, the arc-shaped plate 33 is fixed at one end of the sliding plate 32 far away from the plugging plate 31, the arc-shaped grooves 331 are formed in the arc-shaped plate 33, the arc-shaped grooves 331 of all the arc-shaped plates 33 jointly form a moving track, the shape of the moving track is close to that of the annular track, and part of the structure of all the centrifugal transmission parts 54 is movably mounted in the moving track. When the motor shaft 2 rotates at a high speed, all the centrifugal rods 52 can drive the centrifugal transmission parts 54 fixed with the centrifugal rods to perform centrifugal motion together, namely, the centrifugal transmission parts 54 can rotate at a high speed around the axis of the motor shaft 2 and can move towards a direction away from the motor shaft 2, then through the mutual matching of all the centrifugal transmission parts 54 and the motion track, all the arc plates 33 are pushed to move towards one end away from the motor shaft 2, so that the blocking plate 31 is driven to move towards one end away from the motor shaft 2, and when the blocking plate 31 moves to the tail end position of the motion track, namely, when the blocking plate 31 completely opens the position of the heat dissipation port 11, the whole blocking assembly 3 is limited by the position to stop moving, and the centrifugal motion assembly 5 can be prevented from continuing to perform centrifugal motion.

It should be noted that, in this embodiment, the number of the centrifugal motion assemblies 5 is greater than or equal to the number of the plugging assemblies 3, so that after all the centrifugal motion assemblies 5 are mutually matched, all the plugging assemblies 3 can be smoothly acted.

In this embodiment, when all the centrifugal motion assemblies 5 are in the non-centrifugal motion state, all the arcuate plates 33 are not moved toward the end far from the motor shaft 2, and in this state, all the arcuate plates 33 may be connected to each other so that the motion track formed by all the arcuate grooves 331 is a continuous and complete track. However, when all the centrifugal motion assemblies 5 are in the centrifugal motion state, all the arc plates 33 are moved toward the end far from the motor shaft 2, and in this state, all the arc plates 33 are separated from each other, so that a gap is formed between the adjacent two arc grooves 331, and thus the entire motion track is a discontinuous track. In this case, when all the centrifugal drive portions 54 move in discontinuous movement tracks, a problem of derailment of one of the centrifugal drive portions 54 may occur.

In order to solve the derailment problem, as shown in fig. 6, 7 and 8, the centrifugal transmission portion 54 in the present embodiment includes a connecting rod 541, an upper end of the connecting rod 541 is fixed to a lower side of the centrifugal rod 52, a mounting rod 542 is fixed to another lower end of the centrifugal rod 52, the mounting rod 542 has an arc-shaped structure, and an arc track of the mounting rod 542 is identical to an arc track of the arc-shaped slot 331. A plurality of connecting shafts 543 are fixed to the lower side of the mounting lever 542, and the plurality of connecting shafts 543 are disposed equidistantly along the arc track of the mounting lever 542, and in this embodiment, the number of connecting shafts 543 is specifically two. The connecting shaft 543 is rotatably provided with a rotating wheel 544, and a rubber layer is sleeved on the outer circumferential wall of the rotating wheel 544. All the rotating wheels 544 are movably mounted in the movement track, and the outer circumferential wall of the rotating wheel 544 may abut against the side wall of the arc-shaped groove 331, where the side wall may be the side wall of the arc-shaped groove 331 close to the motor shaft 2 or far from the motor shaft 2. Through such design, a plurality of rotating wheels 544 are carried on the same centrifugal transmission part 54, and the distance between the rotating wheels 544 can make up for the gap between two adjacent arc-shaped grooves 331, even if one rotating wheel 544 moves to the gap position between the two arc-shaped grooves 331, the whole centrifugal transmission part 54 can not break away from the moving track as long as the other rotating wheel 544 is still in one arc-shaped groove 331. In addition, through the cooperation of the rotating wheel 544 and the movement track, the abrasion between the centrifugal transmission part 54 and the movement track can be reduced, and the service life of the centrifugal transmission part 54 can be prolonged.

As shown in fig. 5 and 8, in the present embodiment, since all the plugging members 3 are moved in a small range, i.e., slid toward the motor shaft 2 or away from the motor shaft 2, the movement stroke may depend on the width of the heat radiation port 11. The arc 33 moves along with it, so that the track formed by all arc grooves 331 is not a true circular track but only a track close to a circular track. However, the motion trajectories of all the rotating wheels 544 in the centrifugal transmission portion 54 are truly circular, so that a certain trajectory error exists between the motion trajectories of the rotating wheels 544 and the trajectories of the motion trajectories. In order to reduce the influence of the track error, the rotating wheel 544 can smoothly move in the moving track, in this embodiment, the width of the arc-shaped slot 331 is set to be larger than the diameter of the rotating wheel 544, and the width of the inlet end 332 and the outlet end 333 of the arc-shaped slot 331 are also set to be larger than the width of the middle portion 334 of the arc-shaped slot 331, and the width from the middle portion 334 of the arc-shaped slot 331 to the inlet end 332 is gradually widened, and the width from the middle portion 334 of the arc-shaped slot 331 to the outlet end 333 is also gradually widened. By doing so, the effect of trajectory error on the course of motion of wheel 544 is reduced.

As shown in fig. 2, in this embodiment, the plugging mechanism further includes a plurality of plugging transmission assemblies 6, the number of the plugging transmission assemblies 6 is specifically five, each plugging transmission assembly 6 is disposed between two adjacent plugging plates 31, and all the plugging assemblies 3 can move simultaneously and in the same direction through the five plugging transmission assemblies 6, so that the motion synchronism of all the plugging assemblies 3 is ensured, when the motion of all the plugging assemblies 3 is synchronous, the deviation of all the centrifugal transmission portions 54 in the motion track is reduced, and the motion of the whole centrifugal transmission mechanism is smoother.

As shown in fig. 2, in particular, the plugging transmission assembly 6 includes a first transmission gear 61 and a second transmission gear 62, both the first transmission gear 61 and the second transmission gear 62 are rotatably mounted on the rear end face of the motor housing 1 through a rotation shaft, and the first transmission gear 61 and the second transmission gear 62 in the same plugging transmission assembly 6 are engaged with each other. The two ends of the plugging plate 31 are respectively fixed with a first transmission rack 312 and a second transmission rack 313, and the length directions of the first transmission rack 312 and the second transmission rack 313 are parallel to the movement track of the plugging plate 31. The first drive rack 312 is engaged with the first drive gear 61 of the same-side closure drive assembly 6, and the second drive rack 313 is engaged with the second drive gear 62 of the same-side closure drive assembly 6. By means of this design, the movements of all the plugging assemblies 3 are synchronized, so that the movement of the whole centrifugal transmission mechanism is smoother.

As shown in fig. 1, 2 and 6, in this embodiment, the centrifugal motion assembly 5 further includes fan blades 55, the fan blades 55 are fixed on one end of the centrifugal rod 52 away from the connecting ring 4, when the motor shaft 2 rotates at a high speed to drive all the fan blades 55 to rotate, the wind direction of the fan blades 55 is from the front end of the motor to the rear end of the motor, so that the wind direction is prevented from facing the heat dissipation opening 11, impurities are blown into the heat dissipation opening 11, and meanwhile, heat emitted from the heat dissipation opening 11 can be taken away rapidly, so that the heat dissipation performance of the motor is improved. In addition, be fixed with a plurality of radiating fins 15 on the motor housing 1, the outside cover of motor housing 1 is equipped with protection casing 7, and the front end of protection casing 7 is uncovered, and protection casing 7 can be with radiating fins 15, shutoff mechanism and centrifugal drive mechanism all protection. The rear end of protection casing 7 has seted up a plurality of ventilation holes 71, and the wind that the flabellum piece 55 produced can come in from the gap between protection casing 7 front end and the motor housing 1, goes out from the ventilation hole 71 of protection casing 7 rear end again to drive the heat on the radiating fin 15 and the heat that gives off from thermovent 11, with this heat dispersion that further promotes the motor.

As shown in fig. 1 and 2, in the present embodiment, an air intake dust guard 8 is installed between the front end of the shield 7 and the motor housing 1. Through such design, when fan blade 55 rotates and produces wind-force, air intake dust screen panel 8 can block most impurity, reduces the circumstances that impurity pollutes motor housing 1 lateral wall, fin 15, protection casing 7 inside wall, shutoff mechanism and centrifugal drive mechanism.

The above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered by the scope of the claims of the present invention. The technology, shape, and construction parts of the present invention, which are not described in detail, are known in the art.

Claims (10)

1. The power motor for the weeding machine comprises a motor shell (1) and a motor shaft (2) rotatably arranged on the motor shell (1), wherein a plurality of groups of heat dissipation ports (11) communicated with the interior of the motor shell (1) are formed in the rear end of the motor shell (1), and the heat dissipation ports (11) are arranged in an annular array structure; the plugging mechanism comprises a plurality of plugging components (3), wherein the plugging components (3) are arranged in an annular array structure, each plugging component (3) corresponds to one group of heat dissipation ports (11), the plugging components (3) are slidably mounted on the rear end face of the motor shell (1), and the plugging components (3) can plug/open the heat dissipation ports (11); the centrifugal transmission mechanism comprises a connecting ring (4) and a plurality of centrifugal motion components (5), wherein the connecting ring (4) is fixed at the rear end of a motor shaft (2), the centrifugal motion components (5) are arranged in an annular array structure and are connected to the connecting ring (4), the centrifugal motion components (5) can drive the plugging components (3) to open a heat dissipation opening (11) when in centrifugal motion under the driving of the motor shaft (2), and the centrifugal motion components (5) can drive the plugging components (3) to plug the heat dissipation opening (11) under the non-centrifugal motion state.

2. The motor according to claim 1, wherein the blocking assembly (3) comprises a blocking plate (31), a through hole (311) matched with the heat dissipation port (11) is formed in the blocking plate (31), a sliding plate (32) is fixed at one end of the blocking plate (31), a sliding groove (14) matched with the sliding plate (32) is formed in the rear end face of the motor housing (1), a part of the sliding plate (32) is slidably mounted in the sliding groove (14), when the sliding plate (32) slides to the end close to the motor shaft (2) along the movement track of the sliding groove (14), the heat dissipation port (11) is completely blocked by the blocking plate (31), and when the sliding plate (32) slides to the end far away from the motor shaft (2) along the movement track of the sliding groove (14), the through hole (311) of the blocking plate (31) coincides with the heat dissipation port (11) to completely open the heat dissipation port (11).

3. The motor according to claim 2, characterized in that the centrifugal motion assembly (5) comprises a fixed rod (51), a centrifugal rod (52) and a compression spring (53); one end of the fixed rod (51) is fixed on the connecting ring (4); one end of the eccentric rod (52) is provided with a blind hole (521), and one end of the fixed rod (51) is arranged in the blind hole (521) of the eccentric rod (52) so that the eccentric rod (52) is arranged on the fixed rod (51) in a sliding manner along the length direction of the eccentric rod; the compression spring (53) is sleeved on the fixed rod (51), a first baffle (511) is fixed at one end, far away from the connecting ring (4), of the fixed rod (51), a second baffle (522) is fixed at the open end of the blind hole (521) of the centrifugal rod (52), one end of the compression spring (53) abuts against the first baffle (511), and the other end of the compression spring (53) abuts against the second baffle (522).

4. A motor according to claim 3, characterized in that the centrifugal movement assembly (5) further comprises a centrifugal transmission (54), the centrifugal transmission (54) being fixed to the centrifugal rod (52); the plugging assembly (3) further comprises an arc-shaped plate (33), the arc-shaped plate (33) is fixed at one end, far away from the plugging plate (31), of the sliding plate (32), an arc-shaped groove (331) is formed in the arc-shaped plate (33), all the arc-shaped grooves (331) of the arc-shaped plate (33) jointly form a movement track, and part of the structure of the centrifugal transmission part (54) is movably mounted in the movement track.

5. The motor according to claim 4, wherein the centrifugal transmission portion (54) comprises a connecting rod (541), one end of the connecting rod (541) is fixed at the lower side of the centrifugal rod (52), the other end of the centrifugal rod (52) is fixed with a mounting rod (542), the lower side of the mounting rod (542) is fixed with a plurality of connecting shafts (543), a rotating wheel (544) is rotatably mounted on the connecting shafts (543), the rotating wheel (544) is movably mounted in the moving track, and the outer circumferential wall of the rotating wheel (544) can abut against the side wall of the arc-shaped groove (331).

6. The electric machine of claim 5, wherein the arcuate slot (331) has a width greater than a diameter of the wheel (544), and wherein the arcuate slot (331) has an inlet end (332) and an outlet end (333) each having a width greater than a width of a central portion (334) of the arcuate slot (331).

7. The motor according to claim 6, characterized in that the plugging mechanism further comprises a plurality of plugging transmission assemblies (6), each plugging transmission assembly (6) is arranged between two adjacent plugging plates (31), the plugging transmission assemblies (6) comprise a first transmission gear (61) and a second transmission gear (62), the first transmission gear (61) and the second transmission gear (62) are rotatably mounted on the rear end face of the motor housing (1), and the first transmission gear (61) and the second transmission gear (62) are meshed with each other; the two ends of the plugging plate (31) are respectively fixed with a first transmission rack (312) and a second transmission rack (313), the first transmission rack (312) is meshed with a first transmission gear (61) of the same-side plugging transmission assembly (6), and the second transmission rack (313) is meshed with a second transmission gear (62) of the same-side plugging transmission assembly (6).

8. The motor according to claim 7, characterized in that the centrifugal motion assembly (5) further comprises fan blades (55), the fan blades (55) being fixed on the end of the centrifugal rod (52) remote from the connecting ring (4), the direction of the wind of the fan blades (55) being from the front end of the motor to the rear end of the motor; the motor is characterized in that a plurality of radiating fins (15) are fixed on the motor shell (1), a protective cover (7) is sleeved outside the motor shell (1), the front end of the protective cover (7) is open, and a plurality of ventilation holes (71) are formed in the rear end of the protective cover (7).

9. The motor according to claim 8, characterized in that an air inlet dust screen (8) is installed between the front end of the protective cover (7) and the motor housing (1).

10. The electric machine according to claim 1, characterized in that the electric machine housing (1) is fitted with a heat-dissipating dust screen (12) in each heat-dissipating opening (11).

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