Electric circular saw

Abstract

The present invention discloses a circular saw, comprising: a saw blade for cutting a workpiece; a guard at least partially surrounding the saw blade; a driving part for driving the saw blade to rotate about a first axis direction; a housing forming a receiving space for receiving the driving part; a base plate for mounting the housing and the guard; and further comprising a dust blowing structure, the dust blowing structure including: a blowing assembly disposed on the driving part; a dust blowing part disposed on the base plate and a wind guiding part disposed between the dust blowing part and the blowing assembly; the dust blowing part includes a diversion hole and a diversion groove disposed on the base plate; the diversion hole is a through hole penetrating the base plate, and the diversion groove is a groove disposed on the lower side of the base plate, and the diversion hole is communicated with the diversion groove. The dust blowing structure of this circular saw is simple and has a good dust blowing effect.

Description

Technical Field

[0001] The present invention relates to a power tool, and more particularly to a circular saw. Background Art

[0002] A circular saw generally includes structures such as a saw blade, a base plate, a housing, and a motor. In order to improve the cutting accuracy of the circular saw and facilitate the operator to align with the cutting line during cutting, the circular saw further includes a guiding structure for guiding the operator's cutting. However, when the operator judges the cutting direction through the guiding structure, the debris or dust generated during the cutting of the saw blade will block the operator's line of sight. In the prior art, in order to ensure a relatively clear field of view for the cutting direction of the circular saw, some dust blowing devices are also provided. However, the dust blowing devices in the prior art have complex structures, occupy a large space above the base plate, and block the operator's field of view. At the same time, due to the need to install a relatively complex guiding structure, the heat dissipation of the motor is hindered, affecting the service life of the circular saw and also increasing the use cost. How to provide a dust blowing structure with a simple structure and good dust blowing effect is a technical problem to be solved urgently at present. Summary of the Invention

[0003] To solve the deficiencies of the prior art, the purpose of the present invention is to provide a circular saw with a simple structure and good dust blowing effect.

[0004] To achieve the above object, the present invention adopts the following technical solutions:

[0005] A circular saw, comprising: a saw blade for cutting a workpiece; a guard at least partially surrounding the saw blade; a driving part for driving the saw blade to rotate around a first axis direction; a housing forming an accommodation space for accommodating the driving part; a base plate for mounting the housing and the guard; and further comprising a dust blowing structure, the dust blowing structure comprising: a blowing component provided on the driving part; a dust blowing part provided on the base plate and a wind guiding part provided between the dust blowing part and the blowing component; the dust blowing part comprises a diversion hole and a diversion groove provided on the base plate; the diversion hole is a through hole penetrating the base plate, and the diversion groove is a groove provided on the lower side of the base plate, and the diversion hole is communicated with the diversion groove.

[0006] Further, the driving part comprises a motor and a gearbox for fixing the motor, and the gearbox is formed with an opening through which the blowing component can blow out heat dissipation air.

[0007] Further, the gearbox is further formed with a connecting part for fixing to the base plate, the connecting part is arranged on the side of the dust blowing part away from the guard, and can at least partially divide the upper side space of the base plate.

[0008] Further, the wind guiding part is arranged at the opening and is formed with guiding ribs for guiding the heat dissipation air.

[0009] Further, the bottom plate includes a bottom plate plane extending in a first plane. In a first linear direction parallel to the first plane and perpendicular to the first axis, the air guiding portion and the dust blowing portion are substantially located on both sides of the first straight line.

[0010] Further, the bottom plate includes a bottom plate plane extending in a first plane. The guiding ribs extend substantially along a second linear direction in a plane parallel to the first plane, and the guiding ribs extend substantially along a third linear direction in a plane parallel to the first axis; in a first linear direction parallel to the first plane and perpendicular to the first axis, the first straight line intersects with the second straight line and forms an included angle, the included angle is greater than or equal to 5° and less than or equal to 50°; the first straight line intersects with the third straight line and forms an included angle, the included angle is greater than or equal to 5° and less than or equal to 50°.

[0011] Further, the bottom plate includes a bottom plate plane extending in a first plane. The guiding ribs extend substantially along a second linear direction in a plane parallel to the first plane, and the guiding ribs extend substantially along a third linear direction in a plane parallel to the first axis; in a first linear direction parallel to the first plane and perpendicular to the first axis, the first straight line intersects with the second straight line and forms an included angle, the included angle is greater than or equal to 15° and less than or equal to 25°; the first straight line intersects with the third straight line and forms an included angle, the included angle is greater than or equal to 15° and less than or equal to 25°.

[0012] Further, it further includes a guiding portion for guiding the cutting direction, and the dust blowing portion is arranged at the rear side of the guiding portion.

[0013] Further, the width of the diversion hole in the left - right direction has the same dimension as the width of the diversion groove in the left - right direction.

[0014] Further, the depth of the diversion groove in the up - down direction is greater than or equal to 0.5 mm and less than or equal to 5 mm.

[0015] The beneficial effect of the present invention is that: by arranging through holes and grooves on the bottom plate, a dust blowing portion with a simple structure and good dust blowing effect is formed. Meanwhile, under the action of the blowing component, the heat dissipation air can be effectively guided to the dust blowing portion, thereby better realizing the function of dust blowing for the electric circular saw. Description of the Drawings

[0016] Figure 1 is a perspective view of the electric circular saw;

[0017] Figure 2 is Figure 1 the perspective view of the electric circular saw in

[0018] Figure 3 is Figure 1 the top view of the electric circular saw in

[0019] Figure 4 is Figure 1 a sectional view of a circular saw in

[0020] Figure 5 is Figure 1 a sectional view of the circular saw at another position in

[0021] Figure 6 is Figure 1 a three-dimensional view of the circular saw in

[0022] Figure 7 is Figure 1 a sectional view of the circular saw in

[0023] Figure 8 is Figure 7 a partially enlarged view at position A of the circular saw in

[0024] Figure 9 is Figure 1 a bottom view of the circular saw in

[0025] Figure 10 is Figure 9 a partially enlarged view at position B of the circular saw in

[0026] Figure 11 is a three-dimensional view of the circular saw in the second embodiment after removing all guards, i.e., the saw blade. Detailed implementation manner

[0027] Figure 1 Illustrates a circular saw 100 for cutting workpieces. It includes a saw blade 11, a guard 12, a drive unit 13, a housing 14, and a base plate 15. Among them, the housing 14 forms a receiving space for accommodating the drive unit 13 and also forms a handle portion 141 that can be held. As an implementation manner, a coupling portion 142 for connecting a battery pack is further formed on the housing 14. The battery pack is used to supply power to the drive unit 13 to drive the saw blade 11 to rotate so as to cut the workpiece. Optionally, a terminal for connecting an AC power supply may also be provided on the housing 14, which will not be elaborated here. As long as it can supply energy to the drive unit 13 and enable the drive unit 13 to drive the saw blade 11 to rotate. Such as Figure 1 and Figure 4As shown, the driving part 13 includes a motor 131 for outputting driving force. The saw blade 11 can be driven by the motor 131 and rotate about the first axis 101, thereby realizing the cutting function. The guard 12 at least partially surrounds the saw blade 11 to prevent the saw blade 11 from being exposed to the outside in the non-cutting state. The bottom plate 15 is formed with a bottom plate plane 151 that contacts the workpiece, and the plane where the bottom plate plane 151 is located is parallel to the first axis 101. As an implementation manner, when the user needs to adjust the angle between the bottom plate 15 and the saw blade 11 and cut the workpiece at a preset angle, the plane where the bottom plate plane 151 is located can also intersect with the first axis 101.

[0028] To facilitate the description of the technical solution of the present invention, the front side, rear side, upper car passing, lower side, left side, and right side as shown in Figure 2 are also defined. Among them, the driving part 13 is arranged on the upper side of the bottom plate 15. A channel through which the saw blade 11 can pass is formed on the bottom plate 15. A cutting angle adjusting mechanism 152 is also arranged on the bottom plate 15, and the adjusting mechanism 152 is used to change the cutting angle of the saw blade 11. Specifically, as shown in Figures 2 to 3 the adjusting structure is arranged on the front side of the bottom plate 15 and extends in a first plane 102 perpendicular to the bottom plate plane 151, where the first plane 102 extends in the left-right direction as shown in the figure. A guiding part 153 and a scale disk 154 cooperating with the adjusting structure are also arranged on the bottom plate 15. Among them, the guiding part 153 extends in the front-rear direction and is fixedly connected or integrally formed with the bottom plate 15. The guiding part 153 is substantially parallel to the saw blade 11 and is arranged at the front end of the saw blade 11. In some preferred embodiments, the guiding part 153 coincides with the saw blade 11 on a straight line extending in the front-rear direction. Through such a setting, the user can cut the workpiece within a specified range or on a preset marking line by guiding through the guiding part 153 without observing the saw blade 11. When the user cuts the workpiece, due to the cutting action of the saw blade 11, more debris or dust will be generated at the front end of the guiding part 153. The accumulation of debris or dust on the marking line or at the front end of the guiding part 153 will block the user's line of sight and affect the cutting accuracy of the user. For this reason, in this embodiment, a dust blowing structure 16 is also provided. The dust blowing structure 16 can blow away the debris or dust at the front end of the guiding part 153, so that the part to be cut at the front end of the saw blade 11 is always kept clean, increasing the visibility for cutting and optimizing the cutting accuracy.

[0029] Specifically, as shown in Figures 2 to 6As shown. The dust blowing structure 16 includes a blowing component 161, a wind guiding part 162, and a dust blowing part 163. Among them, the blowing component 161 rotates under the drive of the motor 131 to form cooling air, and the wind guiding part 162 can guide the cooling air from the motor 131 to the dust blowing part 163, and further guide the cooling air to the front end of the guiding part 153 under the action of the dust blowing part 163, so as to blow away the debris or dust at the front end of the guiding part 153. As an implementation manner, the blowing component 161 includes a fan 161a, and the fan 161a is arranged on the output shaft 131a of the motor 131. When the motor 131 rotates, it will drive the fan 161a to rotate synchronously, thereby forming cooling air. The wind guiding part 162 is arranged on the right side of the blowing component 161. As an implementation manner, the wind guiding part 162 is arranged on the gearbox 132. The gearbox 132 is used to install and fix the motor 131 and related accessories. Specifically, the gearbox 132 further includes a connecting part 132a connected to the bottom plate 15. An opening 132b is also arranged on the gearbox 132, and the wind guiding part 162 is specifically arranged at the opening 132b. The opening 132b can allow the cooling air blown out by the blowing component 161 to flow out and be guided to the dust blowing part 163. Specifically, the wind guiding part 162 includes a guiding rib 162a for directly guiding the cooling air to the dust blowing part 163. The wind guiding part 162 is arranged on the left side of the dust blowing part 163. In the left-right direction shown in the figure, there is a certain distance between the wind guiding part 162 and the dust blowing part 163. Or rather, in a direction of a first straight line 103 parallel to the first plane 102 and perpendicular to the first axis 101, the wind guiding part 162 and the dust blowing part 163 are basically located on both sides of the first straight line 103. In order to enable the opening 132b to directly guide the cooling air to the dust blowing part 163, the guiding rib 162a extends basically along the direction of a second straight line 104 in a plane parallel to the first plane 102. The first straight line 103 intersects with the second straight line 104 to form an included angle α; the guiding rib 162a also extends basically along the direction of a third straight line 105 in a plane perpendicular to the first axis 101. The first straight line 103 intersects with the third straight line 105 to form an included angle β. When the included angle α is greater than or equal to 5° and less than or equal to 50° and the included angle β is greater than or equal to 5° and less than or equal to 50°, the guiding rib 162a can preferably guide the cooling air in the wind guiding cover to the dust blowing part 163. Further, when the included angle α is greater than or equal to 15° and less than or equal to 25° and the included angle β is greater than or equal to 15° and less than or equal to 25°, the guiding effect of the guiding rib 162a is better.

[0030] In addition, one end of the connecting portion 132a is connected to the main body of the gearbox 132, and the other end is disposed near the adjusting mechanism 152. The connecting portion 132a is disposed on the left side of the dust blowing portion 163, which can effectively separate the space on the left side of the shield 12, and form a relatively small space between the shield 12 and the connecting portion 132a, so that the cooling air blown out from the opening 132b is more concentrated, avoiding the cooling air from flowing around in an open space, thereby effectively increasing the dust blowing efficiency.

[0031] As Figure 2 , Figures 7 to 10 shown, the dust blowing portion 163 is disposed at the rear side of the guiding portion 153 and is substantially parallel to the guiding portion 153. In this embodiment, the dust blowing portion 163 specifically includes a diversion hole 163a and a diversion groove 163b. Among them, the diversion hole 163a is a through hole penetrating the bottom plate 15, and the diversion groove 163b is a section of groove disposed on the lower side of the bottom plate 15 and extending from the diversion hole 163a to the front end of the bottom plate 15. The diversion groove 163b is smooth and continuous and communicates with the diversion hole 163a. It can be understood that by providing the diversion hole 163a and the diversion groove 163b on the bottom plate 15, the complexity of the dust blowing structure 16 can be effectively reduced. As an implementation manner, the diversion hole 163a and the diversion groove 163b are through holes and grooves provided on the existing bottom plate 15, rather than providing a separate guiding structure or guiding structure, which not only simplifies the blowing structure, but also avoids setting a complex guiding structure or guiding structure, affecting the visibility during the operation of the operator, avoiding other structures mounted on the gearbox 132 from affecting the heat dissipation efficiency of the motor 131, and at the same time effectively reducing the manufacturing cost and saving materials.

[0032] As an implementation manner, the guiding portion 153 is disposed within the space range where the diversion groove 163b is located. In a linear direction perpendicular to the bottom plate plane 151, the diversion groove 163b has a projection within the bottom plate plane 151, and the guiding portion 153 is disposed within this projection range, so as to facilitate blowing off the debris and dust at the front end of the guiding portion 153. As an implementation manner, the diversion groove 163b has a length in the front-rear direction, a width in the left-right direction, and a depth in the up-down direction. Among them, the width of the diversion hole 163a in the left-right direction has the same dimension as the width of the diversion groove 163b in the left-right direction, so as to facilitate the cooling air flowing into the diversion hole 163a to converge more concentratedly into the diversion groove 163b. The depth of the diversion groove 163b in the up-down direction has a preset value, so as to facilitate the effective blowing of the cooling air, and at the same time avoid the cooling air being too quickly dispersed due to too deep a depth, affecting the blowing efficiency. Specifically, the depth H of the diversion groove 163b in the up-down direction is greater than or equal to 1 mm and less than or equal to 5 mm.

[0033] When the operator operates the circular saw 100 to cut a workpiece, the cutting line can be aligned through the guiding portion 153, and the cutting operation can be performed at a specified position. Before the saw blade 11 contacts the workpiece, the cooling air generated by the air blowing assembly 161 and the air generated when the saw blade 11 rotates will be synchronously blown to the front side of the saw blade 11; when the saw blade 11 starts to contact the workpiece, the cooling air generated by the air blowing assembly 161 and the air generated by the rotation of the saw blade 11 can still be synchronously blown to the front side of the guiding portion 153, so that the cutting line is clearly exposed; when the saw blade 11 cuts into the workpiece, at this time the saw blade 11 is stuck in the workpiece, and the air generated by the rotation of the saw blade 11 cannot be transmitted to the front side of the workpiece, or rather, a relatively closed space is formed between the saw blade 11 and the workpiece, making the air flow unable to pass through the workpiece to blow to the front side of the guiding portion 153; at this time, the cooling air generated by the air blowing assembly 161 passes through the guiding rib 162a and flows into the diversion groove 163b through the diversion hole 163a, thereby generating an air flow between the bottom plate 15 and the workpiece, and quickly blowing away the debris and dust on the front side of the guiding portion 153.

[0034] As Figure 11 shown, in the second embodiment of the present invention, the guard 21 and the gearbox can also be fixed to the bottom plate 22 by providing a connecting portion 211 on the guard 21. Here, the connecting portion 211 is fixedly connected to or integrally formed with the guard 21.

[0035] The foregoing shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the above embodiments do not limit the present invention in any form. Any technical solutions obtained by means of equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims

1. An electric circular saw, comprising: a saw blade for cutting a workpiece; a guard at least partially surrounding the saw blade; a driving part for driving the saw blade to rotate about a first axis direction; a housing forming a receiving space for receiving the driving part; a base plate for mounting the housing and the guard; characterized in that it further comprises a dust blowing structure, and the dust blowing structure includes: a blowing component disposed on the driving part; a dust blowing part disposed on the base plate and a wind guiding part disposed between the dust blowing part and the blowing component; the dust blowing part includes a diversion hole and a diversion groove disposed on the base plate; the diversion hole is a through hole penetrating the base plate, and the diversion groove is a groove disposed on the lower side of the base plate, and the diversion hole communicates with the diversion groove.

2. The electric circular saw according to claim 1, characterized in that the driving part includes a motor and a gearbox for fixing the motor, and the gearbox is formed with an opening through which the blowing component can blow out heat dissipation air.

3. The electric circular saw according to claim 2, characterized in that the gearbox is further formed with a connecting part for fixing to the base plate, the connecting part is disposed on a side of the dust blowing part away from the guard, and can at least partially divide the upper side space of the base plate.

4. The electric circular saw according to claim 2, characterized in that the wind guiding part is disposed at the opening and is formed with guiding ribs for guiding heat dissipation air.

5. The electric circular saw according to claim 1, characterized in that the base plate includes a base plate plane extending in a first plane, and in a first linear direction parallel to the first plane and perpendicular to the first axis, the wind guiding part and the dust blowing part are substantially located on both sides of the first straight line.

6. The electric circular saw according to claim 4, characterized in that the base plate includes a base plate plane extending in a first plane, the guiding ribs substantially extend in a second linear direction in a plane parallel to the first plane, and the guiding ribs substantially extend in a third linear direction in a plane parallel to the first axis; in a first linear direction parallel to the first plane and perpendicular to the first axis, the first straight line intersects with the second straight line to form an angle, the angle is greater than or equal to 5° and less than or equal to 50°; the first straight line intersects with the third straight line to form an angle, the angle is greater than or equal to 5° and less than or equal to 50°.

7. The electric circular saw according to claim 4, characterized in that the base plate includes a base plate plane extending in a first plane, the guiding ribs substantially extend in a second linear direction in a plane parallel to the first plane, and the guiding ribs substantially extend in a third linear direction in a plane parallel to the first axis; in a first linear direction parallel to the first plane and perpendicular to the first axis, the first straight line intersects with the second straight line to form an angle, the angle is greater than or equal to 15° and less than or equal to 25°; the first straight line intersects with the third straight line to form an angle, the angle is greater than or equal to 15° and less than or equal to 25°.

8. The electric circular saw according to claim 1, wherein, it further includes a guiding portion for guiding the cutting direction, and the dust blowing portion is arranged at the rear side of the guiding portion.

9. The electric circular saw according to claim 1, wherein, the width of the diversion hole in the left - right direction has the same dimension as the width of the diversion groove in the left - right direction.

10. The electric circular saw according to claim 1, wherein, the depth of the diversion groove in the up - down direction is greater than or equal to 0.5 mm and less than or equal to 5 mm.

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