Handheld electric planer

Abstract

A handheld electric planer, comprising a machine housing and a motor and cutter shaft arranged on the machine housing, the motor being in transmission connection with the cutter shaft by means of a belt, and a blade being arranged on the cutter shaft. The machine housing comprises a shaving discharge channel in fluid communication with the cavity in which the cutter shaft is arranged. A fan is arranged on an output shaft of the motor. The machine housing comprises a channel which is in fluid communication with the shaving discharge channel and with the space in which the fan is located, and a heat dissipation hole in fluid communication with said channel, the heat dissipation hole facing the belt. According to the present invention, a motor shaft drives the fan to move and generate wind power, a part of said wind power is used for forming negative pressure in the shaving discharge channel in order to rapidly discharge shavings, and another part of said wind power is provided to the belt for dissipating heat from the belt so as to prolong the service life of the belt, thus increasing the degree of user satisfaction.

Description

A handheld electric planer

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on November 20, 2023, with application number 202323120960.5 and utility model name “A Handheld Electric Planer”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The utility model relates to the technical field of electric tools, in particular to a handheld electric planer. Background Art

[0003] Electric planers are widely used in the woodworking industry, improving work efficiency and reducing operator workload. They typically include a housing, a motor mounted on the housing, and a blade shaft. The motor is typically connected to the blade shaft via a belt, allowing the motor to rotate the blade shaft. A blade is mounted on the blade shaft, allowing the blade to cut wood, as described in the prior art patent CN201023256Y.

[0004] Because the belt is in continuous motion during the operation of the electric planer, the temperature at the belt will rise. In the existing technology, there is no design for cooling the belt. After the belt is damaged, it is directly replaced with a new belt. Although the cost of the belt is not high, when the belt is damaged, the user is temporarily unable to use the electric planer, and repurchasing and replacing it requires time and cost. Therefore, it is necessary to make improvements. Summary of the Invention

[0005] The utility model aims to solve the deficiencies in the prior art and provides a handheld electric planer, which can extend the service life of the belt and improve user satisfaction.

[0006] In order to solve the above technical problems, the present invention is solved by the following technical solutions:

[0007] A handheld electric planer includes a housing and a motor and a cutter shaft configured on the housing, the motor being connected to the cutter shaft via a belt, the cutter shaft being provided with a blade, the housing including a chip removal channel fluidically connected to a cavity in which the cutter shaft is provided, a fan being provided on the output shaft of the motor, the housing including a channel fluidically connecting the chip removal channel with a space where the fan is located, and a heat dissipation hole fluidically connected to the channel, the heat dissipation hole facing the belt.

[0008] In the above solution, preferably, the housing is equipped with a cover, the cover is provided with small heat dissipation holes in fluid communication with the heat dissipation holes, and the aperture of the small heat dissipation holes is smaller than the aperture of the heat dissipation holes.

[0009] In the above solution, preferably, the diameter of the heat dissipation holes ranges from 1 to 3 mm.

[0010] In the above solution, preferably, the cover is made of nylon.

[0011] In the above solution, preferably, the horizontal position of the heat dissipation holes is flush with the horizontal position of the upper section or the lower section of the belt.

[0012] In the above solution, preferably, the housing is provided with a cover plate for covering the belt, and the cover plate includes a heat dissipation port in fluid communication with the heat dissipation hole.

[0013] In the above scheme, preferably, the chip removal channel is a cylindrical channel with openings at both ends, on which a guide plug-in is arranged, the guide plug-in includes an inner cavity, and one end is open and the other end is closed, and the guide plug-in is provided with a first hole for connecting the inner cavity with the fluid of the cavity where the knife shaft is located, and a second hole for connecting the inner cavity with the channel fluid.

[0014] In the above solution, preferably, the closed end of the guide plug is provided with a baffle assembly located in the inner cavity, and the baffle assembly includes:

[0015] a first baffle, the first baffle corresponding to the second hole, a first guide curved surface being provided on a side of the first baffle facing the second hole, the first guide curved surface being used to guide air entering through the second hole to flow toward the open end of the guide plug;

[0016] Two second baffles correspond to the two first holes respectively. The second baffle is provided with a second guide surface on the side facing the corresponding first hole. The second guide surface is used to guide the debris entering from the corresponding first hole to flow toward the opening end of the guide plug.

[0017] In the above solution, preferably, the guide plug-in is configured at one of the two ends of the chip removal channel.

[0018] In the above solution, preferably, the channel is located between the chip removal channel and the space where the fan is located.

[0019] In the above solution, preferably, a guide plate is provided at the opening of the channel connected to the chip removal channel.

[0020] In the above solution, preferably, the guide plate divides the opening connecting the channel and the chip removal channel into two parts.

[0021] The beneficial effects of the utility model are:

[0022] The utility model uses the motor shaft to drive the fan to generate wind power, a part of which is used to form negative pressure for chip removal to facilitate rapid chip removal, and the other part is used to provide heat to the belt to extend the service life of the belt and improve user satisfaction. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] FIG1 is a schematic diagram of the present utility model.

[0024] FIG2 is a schematic diagram of a guide plug-in unit of the present invention.

[0025] FIG3 is a schematic diagram of the utility model in a disassembled state.

[0026] FIG4 is a schematic diagram of the exploded state of part of the housing and the cover of the present invention.

[0027] FIG5 is a schematic diagram of a portion of the housing of the present invention from another perspective.

[0028] FIG6 is a schematic diagram showing the position layout of the belt and fan of the present invention.

[0029] FIG7 is a schematic diagram of the guide plug-in of the present invention from another angle.

[0030] FIG8 is a schematic diagram showing the distribution of baffle components inside the guide plug-in shown in FIG7 .

[0031] FIG9 is a schematic diagram of the second hole of the guide plug shown in FIG7 from a side perspective.

[0032] FIG10 is a schematic diagram showing the distribution of the first baffle and the two second baffles in the guide plug-in shown in FIG7 in the circumferential direction;

[0033] FIG11 is a schematic diagram of the guide plug-in being inserted into the housing from the left side;

[0034] FIG12 is a schematic diagram showing the guide plug-in being inserted into the housing from the right side. DETAILED DESCRIPTION

[0035] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments:

[0036] Referring to Figures 1 to 6, a handheld electric planer includes a housing 1, a motor is installed in the housing 1, a fan 2 is fixed to the motor output shaft, so that the fan 2 can rotate with the operation of the motor to generate wind, and a pulley is provided at the outer end of the motor shaft. At the same time, a cutter shaft is rotatably installed on the housing 1, and one end of the cutter shaft also has a pulley. A belt 3 is wound around the two pulleys to realize the transmission connection between the motor and the cutter shaft, and a blade is installed on the cutter shaft.

[0037] In this embodiment, the casing 1 has a chip removal channel 11 with openings at both ends. The shape of the chip removal channel 11 can be cylindrical. On the one hand, the chip removal channel 11 is connected to the fluid of the cavity where the knife shaft is located, and on the other hand, it is connected to the fluid of the space where the fan 2 is located through the channel 12. The channel 12 is located between the chip removal channel and the space where the fan 2 is located.

[0038] Correspondingly, a guide plug-in 4 is installed on the chip removal channel 11. The guide plug-in 4 is optionally configured at either end of the chip removal channel 11. That is, the guide plug-in 4 can be assembled at either end of the chip removal channel 11 according to actual chip removal needs. For example, as shown in FIG11 , the guide plug-in 4 can be inserted into the housing 1 from the left, thereby configuring the guide plug-in 4 at the left end of the chip removal channel 11, which is conducive to discharging the generated debris from the left side of the housing 1. As shown in FIG12 , the guide plug-in 4 can be inserted into the housing 1 from the right, thereby configuring the guide plug-in 4 at the right end of the chip removal channel 11, which is conducive to discharging the generated debris from the right side of the housing 1. This arrangement makes it easy to adjust the chip removal direction according to the chip removal needs on site.

[0039] As shown in Figure 2, the guide plug-in 4 includes an inner cavity 41, one end of which is open and connected to the fluid of the inner cavity 41, and the other end is closed. At the same time, the guide plug-in 4 is provided with a first hole 42 for connecting the fluid of the inner cavity 41 with the cavity where the knife shaft is located, and a second hole 43 for connecting the fluid of the inner cavity 41 with the channel 12.

[0040] After the guide plug 4 is installed on the housing 1, the wind force generated by the rotation of the fan 2 passes through the channel 12 and the second hole 43, generating negative pressure in the inner cavity 41 of the guide plug 4, so that the debris generated during the operation of the electric planer can be drawn into the inner cavity 41 of the guide plug 4 from the cavity where the blade shaft is located, and discharged from the open end 44 of the guide plug 4.

[0041] Referring to Figures 7-10, to facilitate chip removal, a baffle assembly 45 is provided at the closed end of the guide insert 4, located within the inner cavity 41. The baffle assembly 45 includes a first baffle 451 and two second baffles 452. The first baffle 451 corresponds to the second hole 43 and has a first curved guide surface 4511 on the side of the first baffle 451 facing the second hole 43. The first curved guide surface 4511 is used to guide air entering through the second hole 43 toward the open end of the guide insert 4. The two second baffles 452 correspond to the two first holes 42, respectively. The second baffles 452 have second curved guide surfaces 4521 on the side of the second baffle 452 facing the corresponding first hole 42. The second curved guide surfaces 4521 are used to guide debris entering through the corresponding first hole 42 toward the open end of the guide insert 4.

[0042] Specifically, the baffle assembly 45 is circumferentially disposed on the inner wall of the closed end of the guide insert 4. The height a of the baffle assembly 45 is set within a range of 5-18 mm. A first baffle 451 is positioned toward the second hole 43. A first guide curved surface 4511 smoothly transitions from the bottom to the top of the first baffle 451. This allows wind entering through the second hole 43 to be redirected by the first guide curved surface 4511, flowing directly toward the open end 44 of the guide insert 4. A second baffle 452 is positioned toward the corresponding first hole 42. A second guide curved surface 4521 smoothly transitions from the bottom to the top of the second baffle 452. This allows debris entering through the corresponding first hole 42 to be redirected by the corresponding second guide curved surface 4521, flowing directly toward the open end 44 of the guide insert 4. In this manner, wood chips produced by the electric planer are driven by the wind and discharged directly from the open end 44 of the guide insert 4. Of course, both the first guide curved surface 4511 and the second guide curved surface 4521 can be concave surfaces.

[0043] It should be emphasized that, considering that the closed end of the existing dust removal duct is a vertical plane, the wind direction flow is not well guided, and a lot of losses occur during the flow of the air duct, resulting in the wood chips driven by the wind easily accumulating in the dust removal duct, causing the duct to be blocked and the chip removal function to fail. At the same time, the baffle of the existing dust removal duct with a vertical plane closed end is too high, and the wind direction flow causes the wood chips on the blade hub to not be completely blown away, causing the chip removal function to fail. To this end, the present application sets three smoothly transitioned curved surfaces on the inner side of the closed end of the guide plug 4, which can effectively control the air duct in the inner cavity 41 and adjust the output channel of the wood chips in the inner cavity 41. In this way, the wind generated by the fan 2 will enter the inner cavity 41 through the second hole 43 and be guided by the first guide curved surface 4511, so that the loss of wind in the inner cavity 41 is greatly reduced, and the air outlet efficiency is improved. At the same time, the height of the baffle assembly 45 is reduced so that the wind can completely blow away the wood chips on the blade hub, solving the problem that wood chips are easily accumulated in the dust removal duct, causing the duct to be blocked and the chip removal function to fail.

[0044] In this embodiment, a heat dissipation hole 13 is further provided on the casing 1 and is in fluid communication with the channel 12. The heat dissipation hole 13 faces the belt 3. In order to improve the dust-proof effect of the space where the belt 3 is located and to make the wind force blowing toward the belt 3 more concentrated, a cover 5 covering the heat dissipation hole 13 is installed at the heat dissipation hole 13. At the same time, a heat dissipation hole 51 is provided on the cover 5 and is in fluid communication with the heat dissipation hole 13 and has a smaller aperture than the heat dissipation hole 13. The horizontal position of the heat dissipation hole 51 is flush with the horizontal position of the upper section or the lower section of the belt 3, so that a part of the wind force generated by the rotation of the fan 2 can be directly blown on the belt 3. Taking Figure 3 as a reference figure, the upper section of the belt refers to the portion of the belt located above between the two pulleys, and the lower section of the belt refers to the portion of the belt located below between the two pulleys.

[0045] As one option, the cover 5 is fixed to the housing 1 by fasteners. The cover 5 is made of nylon, and the diameter of the heat dissipation holes 51 ranges from 1 to 3 mm.

[0046] In order to increase the air volume leading to the belt 3 and enhance the negative pressure effect of the air used for chip removal, in this embodiment, a guide plate 6 is provided at the opening of the channel 12 connected to the chip removal channel 11. As shown in FIG5 , the guide plate 6 separates the opening connecting the channel 12 and the chip removal channel 11 into two parts.

[0047] In this embodiment, as shown in FIG. 3 , the housing 1 is provided with a cover plate 7 for covering the belt 3 . The cover plate 7 includes a heat dissipation port 71 in fluid communication with the heat dissipation hole 13 .

[0048] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A handheld electric planer, comprising a housing, a motor and a cutter shaft arranged on the housing, wherein the motor is connected to the cutter shaft through a belt, the cutter shaft is provided with a blade, and the housing comprises a chip removal channel in fluid communication with a cavity in which the cutter shaft is provided, characterized in that: A fan is arranged on the output shaft of the motor, and the housing includes a channel for fluidly connecting the chip removal channel and the space where the fan is located, and a heat dissipation hole for fluidly connecting the channel, and the heat dissipation hole faces the belt.

2. A handheld electric planer according to claim 1, characterized in that: The housing is equipped with a cover, and the cover is provided with a heat dissipation hole in fluid communication with the heat dissipation hole, and the aperture of the heat dissipation hole is smaller than the aperture of the heat dissipation hole.

3. A handheld electric planer according to claim 2, characterized in that: The diameter of the heat dissipation holes ranges from 1 to 3 mm.

4. A handheld electric planer according to claim 2 or 3, characterized in that: The material of the sealing cover is nylon.

5. The handheld electric planer according to claim 2, characterized in that: The horizontal position of the heat dissipation holes is flush with the horizontal position of the upper section or the lower section of the belt.

6. The handheld electric planer according to claim 1, characterized in that: The housing is provided with a cover plate for covering the belt, and the cover plate includes a heat dissipation port which is in fluid communication with the heat dissipation hole.

7. The handheld electric planer according to claim 1, characterized in that: The chip removal channel is a cylindrical channel opened at both ends, on which a guide plug-in is arranged. The guide plug-in includes an inner cavity, and one end is open and the other end is closed. The guide plug-in is provided with a first hole for connecting the inner cavity with the fluid of the cavity where the knife shaft is located, and a second hole for connecting the inner cavity with the fluid of the channel.

8. The handheld electric planer according to claim 7, characterized in that: The closed end of the guide plug is provided with a baffle assembly located in the inner cavity, and the baffle assembly includes: A first baffle, the first baffle corresponding to the second hole, a first guide curved surface is provided on a side of the first baffle facing the second hole, the first guide curved surface is used to guide the wind entering from the second hole to flow toward the opening end of the guide plug; Two second baffles correspond to the two first holes respectively. The second baffle is provided with a second guide curved surface on one side facing the corresponding first hole. The second guide curved surface is used to guide the debris entering from the corresponding first hole to flow toward the opening end of the guide plug-in.

9. The handheld electric planer according to claim 7, characterized in that: The guide plug-in is configured at one of the two ends of the chip removal channel.

10. The handheld electric planer according to claim 7, characterized in that: The channel is located between the chip removal channel and the space where the fan is located.

11. The handheld electric planer according to claim 1, characterized in that: The channel is provided with a guide plate at an opening thereof which is connected to the chip removal channel.

12. The handheld electric planer according to claim 11, characterized in that: The guide plate divides the opening communicating between the channel and the chip removal channel into two parts.

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