edger

Abstract

The application provides a trimming machine, comprising: a housing with an air inlet and an air outlet; a motor; an output shaft; a shaft locking mechanism with a locking shaft connected to the output shaft, the housing having a mounting seat accommodating the locking shaft; a fan rotating to generate a cooling airflow, the cooling airflow being drawn in from the air inlet, flowing through the motor, and being discharged from the air outlet; the housing being provided with an air outlet end near the output shaft, the output shaft extending through the air outlet end; the air outlet being provided with a plurality of air outlets distributed in the circumferential direction around the output shaft; the mounting seat being connected to the air outlet end; a guide rib being arranged between two adjacent air outlets, along the circumferential direction away from the mounting seat, the farthest guide rib from the mounting seat being defined as a farthest guide rib; along the circumferential direction from the farthest guide rib towards the mounting seat, the air outlet area of the plurality of air outlets gradually increases; the guide rib being provided with an inclined rib and a straight rib, the straight rib being located downstream of the inclined rib. The trimming machine has good heat dissipation and dust blowing effects.

Description

Technical Field

[0001] This invention relates to an edge trimming machine, and more particularly to an edge trimming machine used in decoration, construction and other applications. Background Technology

[0002] A trimming machine is a power-driven output unit that moves a cutting tool to trim and groove wood and other processed parts. It is widely used in the construction and decoration industries.

[0003] Existing trimming machines generally include a housing, a motor housed within the housing, and a fan mounted at the front of the motor. This fan is usually an axial fan, which, when rotating, draws cooling air into the housing to dissipate heat from the motor. However, there is a first air gap between the motor stator and the inner wall of the housing, and a second air gap between the stator and the rotor. The flow area of ​​the second air gap is smaller than that of the first air gap. Therefore, most of the cooling airflow passes between the motor stator and the inner wall of the housing, while a small portion passes between the stator and the rotor. This results in relatively low airflow on the rotor side, and the heat on the rotor side cannot be effectively dissipated, leading to a higher overall temperature rise of the motor. Furthermore, when heat is transferred to the housing, the user finds it uncomfortable to hold, making it difficult to achieve a good experience and comfort.

[0004] In actual operation, when it's inconvenient to connect an external vacuum cleaner, the wood chips cut by the edge trimmer need to be dispersed by the cooling airflow from the radiator motor so that the markings can be clearly seen. For this reason, the edge trimmer's air outlet is designed with guide ribs, which are basically parallel to the motor's axis to achieve better chip removal. However, the cooling airflow, after the axial fan rotates at high speed, flows out in a vortex direction, meaning it has both axial velocity along the motor's axis and circumferential velocity in the same direction as the motor's rotation. Clearly, while the combination of an axial fan and straight guide ribs can improve the machine's chip removal ability to some extent, its efficiency is relatively low.

[0005] In addition, to facilitate the installation and removal of tools, trimming machines often feature a shaft-locking structure on the housing. The locking shaft of this structure inserts into the locking hole of the output unit, keeping the output unit stationary. However, this shaft-locking structure obstructs the air outlet and air guide ribs, significantly reducing heat dissipation and dust removal efficiency.

[0006] Therefore, it is indeed necessary to provide an improved trimming machine to overcome the shortcomings of the existing technology. Summary of the Invention

[0007] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a trimming machine with good heat dissipation and high dust blowing efficiency.

[0008] The present invention solves the problems of the prior art by adopting the following technical solution: a trimming machine, comprising: a housing having an air inlet and an exhaust outlet communicating with each other; a motor housed in the housing; an output shaft driven by the motor; a shaft locking mechanism having a locking shaft connected to the output shaft, the housing having a mounting base for housing the locking shaft; a fan housed in the housing, the fan rotating to generate cooling airflow, the cooling airflow being drawn in from the air inlet, flowing through the motor, and exiting from the exhaust outlet; an exhaust end is provided on the side of the housing near the output shaft, the output shaft extending through the exhaust end; the exhaust outlet is along the output shaft... The axis of the shaft extends through the exhaust end, and multiple exhaust ports are distributed circumferentially around the output shaft. The mounting base is connected to the exhaust end, and on the projection surface of the exhaust end, the mounting base at least partially obscures the exhaust ports. A guide rib is provided between two adjacent exhaust ports, and along the circumferential direction away from the mounting base, the guide rib farthest from the mounting base is defined as the far-end guide rib. Along the circumferential direction from the far-end guide rib toward the mounting base, the exhaust area of ​​the multiple exhaust ports gradually increases. The guide rib has an inclined rib set at an angle to the axis of the output shaft and a straight rib connected to the inclined rib. In the flow direction of the cooling airflow, the straight rib is located downstream of the inclined rib.

[0009] A further improvement is that the included angle of the plurality of exhaust ports increases sequentially along the circumference from the distal air guide rib toward the mounting base.

[0010] A further improvement is that the included angles of the plurality of exhaust ports increase at equal intervals along the circumference from the distal air guide rib toward the mounting base.

[0011] A further improvement is that, in the direction of the cooling airflow, the air guide rib is located downstream of the fan, and the mounting base is located downstream of the air guide rib.

[0012] A further improvement is that the straight rib extends in a direction parallel to the axis.

[0013] A further improvement is as follows: the air guide rib has a first length B in the axial direction, and the inclined rib has a second length C in the axial direction. The first length B and the second length C satisfy the following relationship: 0.5B≤C≤B.

[0014] A further improvement is as follows: the inclined rib has a second included angle α with the axis, and the second included angle α satisfies the following relationship: 0°≤α≤60°.

[0015] A further improvement is as follows: along the radial direction of the exhaust end, the straight rib of the distal air guide rib has a center line, the center line extends through the axis and is perpendicular to the axis, and the mounting base is arranged symmetrically about the center line.

[0016] A further improvement is that the trimming machine also has an airflow guiding element located between the motor and the fan, the airflow guiding element having a vent, through which the cooling airflow flows.

[0017] A further improvement is as follows: the motor has a stator and a rotor connected to each other, and the rotor has a rotor core; the opening diameter of the vent hole is not less than the outer diameter of the rotor core and not greater than the inner diameter of the exhaust port.

[0018] A further improvement is as follows: the housing has a first housing that houses the motor and a second housing that is sleeved on the outer periphery of the first housing. The lower end of the second housing extends beyond the lower end of the first housing. The airflow guiding element is installed at the lower end of the first housing. The exhaust port is located at the lower end of the second housing. The fan is located between the airflow guiding element and the exhaust port.

[0019] A further improvement is as follows: there is a first air gap between the stator and the rotor, and a second air gap between the stator and the first housing of the machine casing, and the airflow guiding element at least partially blocks the second air gap.

[0020] Compared with existing technologies, the present invention has the following beneficial effects: By optimizing the exhaust area of ​​multiple exhaust ports, specifically by gradually increasing the exhaust area of ​​the exhaust ports near the mounting base, at least part of the exhaust ports and air guide ribs that are blocked by the mounting base are compensated, thereby effectively ensuring the heat dissipation and dust blowing effect of the cooling airflow. In addition, the diagonal ribs in the air guide ribs have a function similar to the stationary guide vanes of conventional axial flow fans, used to rectify the cooling airflow blown from the fan, thereby improving the fan's airflow efficiency and work capacity, and reducing the temperature rise of the motor; the straight ribs in the air guide ribs are used to forcibly convert the flow direction of the rectified cooling airflow to a direction parallel to the axis, ensuring that the cooling airflow can directly blow the sawdust generated during operation and improving the user's operating experience. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the trimming machine of the present invention; Figure 2 for Figure 1 A structural schematic diagram of the trimming machine from another perspective; Figure 3 for Figure 1 The diagram shows a cross-sectional view of the trimming machine. Figure 4 for Figure 3 A cross-sectional schematic diagram of the trimming machine from another perspective; Figure 5 for Figure 1 An exploded view of the first housing and airflow guiding element of the trimming machine shown; Figure 6 for Figure 3 A sectional schematic diagram of a portion of the trimming machine shown; Figure 7 for Figure 5 The diagram shows the structure of the airflow guiding element in the trimming machine. Figure 8 for Figure 7 A schematic diagram of the airflow guiding element from another perspective; Figure 9 for Figure 6 The diagram shows the airflow path inside the trimming machine. Figure 10 for Figure 1 A schematic diagram of the structure of the first housing of the trimming machine shown; Figure 11 for Figure 1 A schematic diagram of the first housing and fan of the trimming machine shown; Figure 12 for Figure 10 A schematic diagram showing the projection of the first housing at the exhaust end; Figure 13 for Figure 1 The diagram shows the structure of the air guide ribs and fan of the trimming machine. Figure 14 for Figure 13 Enlarged view of center circle A; Figure 15 For temperature simulation comparison of the gripping area; Figure 16 This is an airflow path diagram for a trimming machine in the prior art that does not have the airflow guiding element of this application. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments.

[0023] The terminology used in this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. For example, terms such as "upper," "lower," "front," "rear," "left," and "right" that indicate orientation or positional relationship are based solely on the orientation or positional relationship shown in the accompanying drawings and are used only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device / element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention.

[0024] Please refer to Figures 1 to 4As shown, an embodiment of the present invention provides a trimming machine 100, which is mainly used for trimming and grooving workpieces such as wood. The trimming machine 100 includes a housing 1, a motor 2 housed within the housing 1, an output unit 3 driven by the motor 2, and a base 5 movably connected to the housing 1. A cutting tool (not shown) is detachably mounted on the output unit 3, and the workpiece is processed via the cutting tool. Specifically, the output unit 3 includes a chuck and a chuck nut mounted on the lower end of the motor shaft 23 of the motor 2. The chuck is installed in a mounting hole at the lower end of the motor shaft 23, and the chuck nut is threaded into the outer wall of the lower end of the motor shaft 23. The cutting tool is mounted inside the chuck, and the cutting tool can be a woodworking tool such as a milling cutter.

[0025] The aforementioned housing 1 is cylindrical and extends vertically. The upper end of the housing 1 has an air inlet 131, and the lower end has an exhaust outlet 121. The air inlet 131 and exhaust outlet 121 are interconnected, allowing external cooling airflow F to flow smoothly within the housing 1. The specific design of the housing 1 can be customized according to actual conditions. In this embodiment, the housing 1 includes a first housing 11 housing the motor 2, a second housing 12 fitted around the outer periphery of the first housing, and a third housing 13 connecting the first housing 11 and the second housing 12. The second housing 12 is configured for the user's hand to hold, and the third housing 13 is located on the upper side and is configured to house a control component 7. The control component 7 is electrically connected to the motor 2 to control the start and stop of the motor 2.

[0026] In this embodiment, the first housing 11 and the third housing 13 are made of resin material, while the second housing 12 is made of metal material, preferably, the second housing 12 is made of aluminum material.

[0027] Furthermore, the first housing 11 is fitted inside the second housing 12 and the upper end of the first housing 11 is connected to the lower end of the third housing 13. The upper end of the second housing 12 is also connected to the lower end of the third housing 13. The radial outer end of the second housing 12 extends no more than the radial outer end of the third housing 13, making the outer diameter of the second housing 12 smaller and the user more comfortable to hold.

[0028] Please refer to Figure 3 As shown, the air inlet 131 is located at the top of the third housing 13, the exhaust port 121 is located at the bottom of the second housing 12, and the motor 2 is located between the air inlet 131 and the exhaust port 121. The air inlet 131 and the exhaust port 121 are in fluid communication within the internal space of the third housing 13 and the first housing 11.

[0029] Please combine Figure 4As shown, the motor 2 includes a stator 21 and a rotor 22 installed inside and connected to each other in the first housing 11, and a motor shaft 23 connected to the rotor 22. The motor shaft 23 is rotatably disposed inside the first housing 11, the rotor 22 is fitted onto the motor shaft 23, and the stator 21 is fitted between the rotor 22 and the first housing 11. Furthermore, a fan 25 is fixedly disposed on the motor shaft 23. The fan 25 is housed inside the housing 1. The motor shaft 23 drives the fan 25 to rotate and generate a cooling airflow F. Furthermore, the external cooling airflow F is drawn in from the air inlet 131, flows through the control component 7, and is split into the first air gap 24 between the stator 21 and the rotor 22 and the second air gap 28 between the stator 21 and the inner wall of the first housing 11. Then it is discharged from the exhaust port 121 to cool and dissipate heat from the control component 7 and the motor 2.

[0030] In this embodiment, the motor 2 drives the motor shaft 23 to move, and the motor shaft 23 directly drives the output unit 3 to move. Therefore, the motor shaft 23 also constitutes the output shaft of the trimming machine 100. Furthermore, for the installation and removal of the cutting tool, the trimming machine 100 also includes a shaft locking mechanism 6 mounted on the second housing 12. Specifically, the motor shaft 23 has a locking hole 231 recessed radially inward from the outer periphery, and the shaft locking mechanism 6 has a locking shaft 61 inserted into the locking hole 231. Please refer to... Figure 10 As shown, the second housing 12 has a mounting base 125 for housing the locking shaft 61, and the mounting base 125 is located adjacent to the exhaust port 121.

[0031] Please see Figure 3 and Figure 6 As shown, the motor shaft 23 of the aforementioned motor 2 extends vertically. The lower end of the motor shaft 23 is supported within the first bearing chamber 122 of the second housing 12, and the upper end of the motor shaft 23 is supported within the second bearing chamber 123 of the third housing 13. The exhaust port 121 is located on the radial outer periphery of the first bearing chamber 122. The fan 25 is located between the first bearing chamber 122 and the stator 21. The fan 25 includes a hub portion 251 mounted on the motor shaft 23 and several fan blades 252 extending radially outward from the outer periphery of the hub portion 251. The fan blades 252 extend radially beyond the first bearing chamber 122 and extend to the location of the exhaust port 121.

[0032] Furthermore, the first bearing chamber 122 and the second bearing chamber 123 have annular structures, and the exhaust port 121 is an annular space formed on the radial outer side of the first bearing chamber 122. Furthermore, the exhaust port 121 is a plurality of through holes spaced apart, and the plurality of exhaust ports 121 are arranged around the radial outer side of the first bearing chamber 122.

[0033] In this embodiment, the first bearing chamber 122 houses the first bearing 26, and the second bearing chamber 123 houses the second bearing 27. The upper and lower ends of the motor shaft 23 are supported by the second bearing 27 and the first bearing 26, respectively. The stator 21 and the rotor 22 are located between the second bearing 27 and the first bearing 26. Furthermore, the fan 25 is adjacent to the first bearing 26.

[0034] Please see Figure 1 As shown, the base 5 is movably mounted on the outside of the second housing 12. The base 5 has a C-shaped cylindrical structure with an opening 51. An operating mechanism 52 is connected to the opening 51. By operating the operating mechanism 52, the size of the opening 51 can be adjusted so that the base 5 can be adapted to trimming machines 100 of different sizes. In addition, operating the operating mechanism 52 can also change the relative position of the base 5 and the second housing 12 in the vertical direction, thereby adjusting the cutting depth of the tool. This allows the trimming machine 100 to perform trimming operations in different scenarios, meeting the diverse needs of users.

[0035] Please see Figure 6 and Figure 9 As shown, the stator 21 has a stator core 111 that abuts against the first housing 11 and a stator winding 112 connected to the stator core 111. The rotor 22 has a rotor core 221 and an armature winding 222 connected to the rotor core 221. The first air gap 24 is located between the stator winding 112 and the rotor core 221, and the armature winding 222 is located inside the stator winding 112.

[0036] Furthermore, this embodiment provides an airflow guiding element 41, please refer to... Figures 4 to 9 As shown, the airflow guiding element 41 is disposed between the stator 21 and the fan 25 of the motor 2, and is used to rectify the cooling airflow F after it flows through the stator 21 and the rotor 22. Please refer to... Figure 4 As shown, on the one hand, the presence of the airflow guiding element 41 can at least partially block the second air gap 28 between the stator 21 and the inner wall of the first housing 11, forcing the cooling airflow F to flow through the first air gap 24 as much as possible, thereby fully dissipating heat from the rotor 22; on the other hand, when the cooling airflow F flows out from the first air gap 24 and the second air gap 28, it is guided by the airflow guiding element 41 and flows towards the stator winding 112 and the armature winding 222, thereby converging more at the lower end of the stator winding 112 and the armature winding 222, further effectively dissipating heat from the motor 2.

[0037] Please see Figure 7 and Figure 8As shown, the airflow guiding element 41 includes a base 41b and a guiding portion 41c extending from the base 41b toward the stator 21. In this embodiment, both the base 41b and the guiding portion 41c are thin-walled annular. The base 41b extends radially, and the guiding portion 41c extends axially, meaning the guiding portion 41c extends toward the stator 21 perpendicular to the base 41b. Further, the guiding portion 41c divides the base 41b into a limiting portion 41d located radially outward of the guiding portion 41c and a guide plate 41e located radially inward of the guiding portion 41c. The guide plate 41e is connected to the limiting portion 41d and extends in an arc shape. A vent hole 41a is formed through the inner side of the guide plate 41e. Please refer to... Figure 6 As shown, the vent 41a has the following relationship: the opening diameter d1 of the vent 41a is not less than the outer diameter d2 of the rotor core 221, and the opening diameter d1 of the vent 41a is not greater than the inner diameter d3 of the exhaust port 121.

[0038] Furthermore, the aforementioned airflow guiding element 41 has a mounting portion 411 extending from the guide plate 41e toward the stator 21. The mounting portion 411 is connected to the stator core 111 by fasteners 412 such as screws. After the airflow guiding element 41 is installed and fixed, the lower end of the first housing 11 abuts against the end face of the limiting portion 41d facing the stator 21, and the inner wall of the first housing 11 abuts against the outer peripheral wall of the guiding portion 41c. Moreover, the projection of the hub portion 251 on the rotor core 221 is located radially inside the vent hole 41a, and the fan blade 252 extends radially outward beyond the opening diameter d1 of the vent hole 41a.

[0039] Please refer to Figure 6 and Figure 9 As shown, since the guide portion 41c of the airflow guiding element 41 abuts against the inner wall of the first housing 11 after installation, and the airflow guiding element 41 at least partially blocks the second air gap 28 between the stator 21 of the motor and the inner wall of the first housing 11, the cooling airflow F can be better concentrated in the first air gap 24 after entering the trimming machine 100. At this time, the stator 21 and rotor 22 on the upper side of the motor have been sufficiently cooled. Furthermore, when the cooling airflow F flows out from the first air gap 24 and the second air gap 28, it will be guided along the inner wall of the guide portion 41c to the guide plate 41e, and the guide plate 41e will guide the cooling airflow F to blow down to the stator winding 112 and armature winding 222 on the lower side, so as to effectively cool the stator winding 112 and armature winding 222 on the lower side, and effectively control the temperature rise of the motor 2 as a whole. Subsequently, the cooling airflow F flows out from the vent 41a along the arc surface on the guide plate 41e and flows to the exhaust port 121, and finally exits from the second housing 12 of the housing 1.

[0040] Please refer to Figure 16As shown in the figure, the airflow path of a trimmer without the airflow guiding element of this application in the prior art is illustrated. As can be seen from the figure, when the fan 25' rotates at high speed, the cooling airflow F' flows through the first air gap 24' between the rotor 22' and the stator 21' and the second air gap 28' between the stator 21' and the housing, and then flows directly towards the lower side of the stator 21' and the rotor 22', subsequently exiting directly from the exhaust port 121'. Under this flow pattern, the cooling airflow F' does not sufficiently flow through the lower stator winding 112' and armature winding 222', resulting in ineffective heat dissipation for this portion of the stator winding 112' and armature winding 222'. Therefore, after the trimmer is equipped with the airflow guiding element 41 of this application, the overall temperature rise of the motor 2 is effectively suppressed, making it more comfortable for the user to hold.

[0041] In addition, in this embodiment, the opening diameter d1 of the vent 41a is set to be no less than the outer diameter d2 of the rotor core 221, that is, the outer wall of the rotor core 221 extends no more than the inner diameter of the vent 41a. This prevents the airflow area of ​​the airflow guiding element 41 from being too small due to the vent 41a being too small, and at the same time reduces the airflow resistance, so that the fan 25 can generate sufficient airflow to meet the heat dissipation requirements of the motor 2. At the same time, setting the opening diameter d1 of the vent 41a to be no greater than the inner diameter d3 of the exhaust port 121 allows the cooling airflow F to be more concentrated at the lower stator winding 112 and armature winding 222, further improving the overall heat dissipation effect of the motor 2.

[0042] Please see Figure 3 , Figure 10 and Figure 11 As shown, the second housing 12 of the aforementioned housing 1 has an exhaust end 120 on the lower side near the output shaft 23. The output shaft 23 extends through the channel 1201 of the exhaust end 120, and the exhaust port 121 passes through the exhaust end 120 along the axis X of the output shaft 23. Multiple exhaust ports 121 are distributed around the output shaft 23 in the circumferential direction. A guide rib 124 is provided between two adjacent exhaust ports 121. The guide rib 124 guides the cooling airflow F, so that the cooling airflow F has better heat dissipation and dust blowing effect.

[0043] Furthermore, the aforementioned first bearing chamber 122 is located radially between the channel 1201 and the exhaust port 121.

[0044] In this embodiment, the lower end of the second housing 12 extends beyond the lower end of the first housing 11, such that the lower end of the second housing 12 and the lower end of the first housing 11 are spaced apart, and the fan 25 is located between the lower end of the second housing 12 and the lower end of the first housing 11. Furthermore, the airflow guiding element 41 is mounted on the lower end of the first housing 11, while the exhaust port 121 is located on the lower end of the second housing 12, and the fan 25 is located between the airflow guiding element 41 and the exhaust port 121.

[0045] In this embodiment, the fan 25 is configured as an axial flow fan.

[0046] Please see Figure 10 As shown, the mounting base 125 is connected to the lower side of the exhaust end 120 and protrudes downward from the exhaust end 120. In the flow direction of the cooling airflow F, the exhaust port 121 and the air guide rib 124 are located downstream of the fan 25, and the mounting base 125 is located downstream of the air guide rib 124.

[0047] Please combine Figure 11 and Figure 12 As shown, on the projection surface of the exhaust end 120, the mounting base 125 will at least partially block the exhaust port 121 and the air guide rib 124, thereby reducing the heat dissipation and dust blowing effect.

[0048] In this embodiment, along the circumferential direction away from the mounting base 125, the air guide rib 124 furthest from the mounting base 125 is defined as the farthest air guide rib 1248. Along the circumferential direction from the farthest air guide rib 1248 toward the mounting base 125, the exhaust areas of the plurality of exhaust ports 121 are set to be unevenly distributed. Furthermore, along the circumferential direction from the farthest air guide rib 1248 toward the mounting base 125, the exhaust areas of the plurality of exhaust ports 121 are set to gradually increase. This invention optimizes the exhaust areas of the plurality of exhaust ports 121; specifically, by gradually increasing the exhaust area of ​​the exhaust ports 121 closer to the mounting base 125, it compensates for at least a portion of the exhaust ports 121 and air guide ribs 124 that are blocked by the mounting base 125, thereby effectively ensuring the heat dissipation and dust blowing effect of the cooling airflow F.

[0049] Please see Figure 12As shown, along the circumference from the distal air guide rib 1248 towards the mounting base 125, the included angles of multiple exhaust ports 121 increase sequentially. On the projection plane of the exhaust end 120, with the axis X of the output shaft 23 as the center point, the line connecting the circumferential edge of each exhaust port 121 to the center point forms a fan shape. This included angle refers to the angle occupied by each fan shape. Since this included angle is positively correlated with the air outlet area of ​​the exhaust port 121, setting the included angle to gradually increase also makes the air outlet area of ​​the exhaust port 121 gradually increase. At the same time, compared with the uniformly distributed exhaust ports in the existing trimming machine, this application can achieve the effect of gradually increasing air outlet area of ​​the exhaust port 121 by simply changing the included angle relationship between the exhaust port 121 and the axis X of the output shaft 23, and the structure is simpler.

[0050] Furthermore, along the circumference from the distal air guide rib 1248 toward the mounting base 125, the included angles of the multiple exhaust ports 121 increase arithmetically. Specifically, see... Figure 12 As shown, counting counterclockwise or clockwise from the far-end air guide rib 1248, the first included angle is 30°, the second included angle is 32°, the third included angle is 34°, and the fourth included angle is 36°. That is to say, the adjacent included angles are all 2° apart. Therefore, while ensuring the heat dissipation and dust blowing effect of the cooling airflow F, it also makes the flow of the cooling airflow F more uniform and stable.

[0051] Please see Figure 12 As shown, it should be noted that the shape of the mounting base 125 may change adaptively according to actual design requirements, resulting in different shielding effects of the mounting base 125 on the nearby exhaust ports 121 and air guide ribs 124. Therefore, this application does not require a specific air outlet area for the near-end exhaust ports adjacent to the mounting base 125, while the air outlet areas of the remaining exhaust ports 121 not affected by the mounting base 125 are set to gradually increase. In this embodiment, there are three near-end exhaust ports 1211: a first near-end exhaust port 1211 located circumferentially on both sides of the mounting base 125, and a second near-end exhaust port 1212 located radially on the outer side of the mounting base 125.

[0052] Please see Figure 13 and Figure 14As shown, the aforementioned air guide rib 124 is provided with an inclined rib 1241 set at an angle to the axis X of the output shaft 23 and a straight rib 1242 connected to the inclined rib 1241. The straight rib 1242 extends in a direction parallel to the axis X, and in the flow direction of the cooling airflow F, the straight rib 1242 is located downstream of the inclined rib 1241. That is to say, the cooling airflow F flows through the inclined rib 1241 first, and then flows through the straight rib 1242. The inclined rib 1241 has a function similar to the stationary guide vane of a conventional axial fan, used to rectify the cooling airflow F blown from the fan 25, thereby improving the airflow efficiency and work capacity of the fan 25 and reducing the temperature rise of the motor 2. The straight rib 1242 is set parallel to the direction of the axis X, used to forcibly convert the flow direction of the rectified cooling airflow F to a direction parallel to the axis X, to ensure that the cooling airflow F can directly blow the sawdust generated during the operation of the trimming machine 100, and improve the user's operating experience.

[0053] Please see Figure 15 As shown, a simulation comparison of the temperature at the gripping point of the trimming machine 100 under three different configurations: "straight ribs + no air guide," "slanted ribs + no air guide," and "slanted straight ribs + air guide." It can be seen that the temperature at the gripping point is 35.35℃ under the "straight ribs + no air guide" combination, 31.85℃ under the "slanted ribs + no air guide" combination, and a decrease to 29.67℃ under the "slanted straight ribs + air guide" combination. The gripping point temperature under the "slanted straight ribs + air guide" combination is approximately 16.1% lower than that under the "straight ribs + no air guide" combination; the temperature under the "slanted straight ribs + air guide" combination is approximately 6.8% lower than that under the "slanted ribs + no air guide" combination. Therefore, it is clear that the combination of "slanted straight ribs + air guide" not only effectively reduces the temperature of the motor 2 but also ensures that the cooling airflow F has a good chip removal effect.

[0054] In this embodiment, the aforementioned air guide rib 124 has a first length B in the X-axis direction, and the inclined rib 1241 has a second length C in the X-axis direction. The first length B and the second length C satisfy the following relationship: 0.5B≤C≤B, that is, ensuring that the length of the inclined rib 1241 is not less than half of the total length of the air guide rib 124. In addition, the inclined rib 1241 has a second included angle α with the X-axis, and the second included angle α satisfies the following relationship: 0°≤α≤60°. This ensures that the air guide rib 124 always efficiently rectifies the cooling airflow F and minimizes the temperature rise of the motor 2, while ensuring that the rectified cooling airflow F can efficiently disperse the wood chips on the workbench to improve the user's operating experience.

[0055] Furthermore, the first length B of the aforementioned air guide rib 124 in the X direction of the axis is not limited.

[0056] Please combine Figure 12As shown, along the radial direction of the exhaust end 120, the straight ribs of the distal air guide rib 1248 have a center line Y, which extends through the axis X and is perpendicular to the axis X. Furthermore, the center line Y extends through the mounting base 125, and the mounting base 125 is symmetrically arranged about the center line Y. By defining the positional relationship between the straight ribs 1242 of the air guide rib 1248 and the mounting base 125, multiple exhaust ports 121 can be arranged more rationally in the circumferential direction to further ensure the heat dissipation and dust blowing effect of the trimming machine 100. The reason is that, on the one hand, in the direction of axis X, the straight rib 1242 is located between the inclined rib 1241 and the mounting base 125, that is, the straight rib 1242 is closer to the mounting base 125 than the inclined rib 1241, and the position of the straight rib 1242 is determined, making the positional relationship between the straight rib 1242 and the mounting base 125 clearer; on the other hand, the inclined rib 1241 is arranged at a second included angle α relative to axis X, and this second included angle α is selected between 0° and 60°. The second included angle α is a variable. If the positional relationship between the inclined rib 1241 and the mounting base 125 is limited, then the positional relationship between the two is unclear, which will undoubtedly increase the design difficulty.

[0057] In this embodiment, multiple exhaust ports 121 are symmetrically arranged about the center line Y. Specifically, there is a first set of exhaust ports in the counterclockwise direction and a second set of exhaust ports in the clockwise direction between the far-end air guide rib 1248 and the mounting base 125. Along the circumference from the far-end air guide rib 1248 toward the mounting base 125, the included angle of each set of exhaust ports 121 increases sequentially.

[0058] Those skilled in the art will readily understand that many other alternatives to the trimming machine of this invention exist without departing from the principles and scope of the invention. The scope of protection of this invention is defined by the claims.

Claims

1. A trimming machine, comprising: A housing having an air inlet and an exhaust outlet that are in communication with each other; The motor is housed within the housing; An output shaft, which is driven by the motor; A shaft locking mechanism having a locking shaft connected to the output shaft, and the housing having a mounting base for receiving the locking shaft; A fan, housed in the housing, rotates to generate cooling airflow, which is drawn in from the air inlet, flows through the motor, and is discharged from the exhaust port; Its features are: The housing has an exhaust end on the side near the output shaft, and the output shaft extends through the exhaust end; the exhaust port passes through the exhaust end along the axial direction of the output shaft, and multiple exhaust ports are distributed around the output shaft in a circumferential direction; The mounting base is connected to the exhaust end, and on the projection surface of the exhaust end, the mounting base at least partially obscures the exhaust port; a guide rib is provided between two adjacent exhaust ports, and along the circumference away from the mounting base, the guide rib farthest from the mounting base is defined as the far-end guide rib; along the circumference from the far-end guide rib toward the mounting base, the exhaust area of ​​the plurality of exhaust ports gradually increases; the guide rib is provided with an inclined rib set at an angle to the axis of the output shaft and a straight rib connected to the inclined rib, and in the flow direction of the cooling airflow, the straight rib is located downstream of the inclined rib.

2. The trimming machine according to claim 1, characterized in that: Along the circumference from the distal air guide rib toward the mounting base, the included angles of the plurality of exhaust ports increase sequentially.

3. The trimming machine according to claim 2, characterized in that: Along the circumference from the distal air guide rib toward the mounting base, the included angles of the plurality of exhaust ports increase arithmetically.

4. The trimming machine according to claim 1, characterized in that: In the direction of the cooling airflow, the air guide rib is located downstream of the fan, and the mounting base is located downstream of the air guide rib.

5. The trimming machine according to claim 4, characterized in that: The straight ribs extend in a direction parallel to the axis.

6. The trimming machine according to claim 5, characterized in that: The air guide rib has a first length B in the axial direction, and the inclined rib has a second length C in the axial direction. The first length B and the second length C satisfy the following relationship: 0.5B≤C≤B.

7. The trimming machine according to claim 5, characterized in that: The inclined rib has a second included angle α with the axis, and the second included angle α satisfies the following relationship: 0°≤α≤60°.

8. The trimming machine according to claim 5, characterized in that: Along the radial direction of the exhaust end, the straight rib of the distal air guide rib has a center line that extends through the axis and is perpendicular to the axis, and the mounting base is arranged symmetrically about the center line.

9. The trimming machine according to claim 1, characterized in that: The trimming machine also has an airflow guiding element located between the motor and the fan, the airflow guiding element having a vent, through which the cooling airflow flows.

10. The trimming machine according to claim 9, characterized in that: The motor has a stator and a rotor connected to each other, and the rotor has a rotor core; the opening diameter of the vent hole is not less than the outer diameter of the rotor core and not greater than the inner diameter of the exhaust port.

11. The trimming machine according to claim 9, characterized in that: The housing has a first housing that houses the motor and a second housing that is sleeved on the outer periphery of the first housing. The lower end of the second housing extends beyond the lower end of the first housing. The airflow guiding element is installed at the lower end of the first housing. The exhaust port is located at the lower end of the second housing. The fan is located between the airflow guiding element and the exhaust port.

12. The trimming machine according to claim 10, characterized in that: There is a first air gap between the stator and the rotor, and a second air gap between the stator and the first housing of the machine casing, and the airflow guiding element at least partially blocks the second air gap.

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