CN213471500U - Electric circular saw - Google Patents

Abstract

The utility model discloses an electric circular saw, include: a saw blade rotatable about a first axis; the motor comprises a motor shaft for driving the saw blade to rotate; a housing formed with an accommodating part for accommodating the motor; the dust collection device comprises a dust outlet arranged on the shell; the housing also forms or has attached thereto: the handle device is hollow and is provided with a dust outlet end and a connecting end, and at least part of the connecting end is communicated with the dust outlet; the dust suction device can discharge the cuttings through the dust outlet end of the handle device. The electric circular saw has compact structure and high chip removal efficiency.

Description

Electric circular saw

Technical Field

The utility model relates to a cutting type instrument, concretely relates to electric circular saw.

Background

Electric circular saws are commonly used for users to cut wood, plastic, etc. In current electric circular saw, because the great powerful output demand of saw bit needs to be satisfied, electric circular saw's motor and transmission structure all set up great, the problem that from this brings is that electric circular saw's complete machine size is great, and the structure is compact inadequately, constitutes certain obstacle to non professional user's operation. In some electric circular saws having an automatic dust suction function, a discharge duct of chips occupies a part of a space of a body of the electric circular saw. For the electric circular saw connected with the external chip removal pipe, the chip removal pipe can influence the convenience of user operation when being wound on the machine body, and how to effectively discharge the chips without influencing the user operation is also a technical problem to be solved urgently at present.

SUMMERY OF THE UTILITY MODEL

For solving the not enough of prior art, the utility model aims to provide a chip removal is convenient and do not influence user operation's electric circular saw.

In order to achieve the above object, the utility model adopts the following technical scheme:

an electric circular saw comprising: a saw blade rotatable about a first axis; the motor comprises a motor shaft for driving the saw blade to rotate; a housing formed with an accommodating part for accommodating the motor; the dust collection device comprises a dust outlet arranged on the shell; the housing also forms or has attached thereto: the handle device is hollow and is provided with a dust outlet end and a connecting end, and at least part of the connecting end is communicated with the dust outlet; the dust suction device can discharge the cuttings through the dust outlet end of the handle device.

Further, the handle device includes: a main handle including a first grip portion for being held by one hand of a user; an auxiliary handle including a second grip portion for being gripped by the other hand of the user; the auxiliary handle is connected to the dust outlet.

Further, the main handle extends along a first direction, and the first direction is perpendicular to the first axis;

the auxiliary handle extends along a second direction, and the second direction is obliquely intersected with the first direction.

Further, the first holding part is arranged symmetrically about a symmetry plane, and the second holding part extends along a direction obliquely intersecting with the symmetry plane;

the extending direction of the second holding part is obliquely intersected with the symmetry plane to form an included angle which is larger than or equal to 50 degrees and smaller than or equal to 70 degrees.

Further, the dust outlet is arranged along the second direction and at least partially coincides with the auxiliary handle.

Further, in a projection plane perpendicular to the first direction, the projections of the main handle and the auxiliary handle in the projection plane along the first direction are at least partially overlapped.

Furthermore, the dust outlet end is also connected with a connecting pipe for discharging the dust.

Further, the connecting channel between the dust outlet end and the connecting end is continuous and smooth.

Further, a conductive piece is connected between the dust outlet end and the connecting end.

Further, the conductive pieces are evenly distributed around the inner side of the auxiliary handle.

The utility model discloses an useful part lies in: through setting up supplementary handle simultaneously to the chip removal pipeline to set up antistatic structure, made the structure of complete machine compacter, space utilization is high, and the chip removal efficiency is higher.

Drawings

Fig. 1 is a perspective view of an electric circular saw;

FIG. 2 is a sectional view of the electric circular saw of FIG. 1;

FIG. 3 is a rear view of the electric circular saw of FIG. 1;

FIG. 4 is a top view of the electric circular saw of FIG. 1;

FIG. 5 is an exploded view of the electric circular saw of FIG. 1 after the battery pack is disassembled;

FIG. 6 is an exploded view of the electric circular saw of FIG. 1 from another perspective after the battery pack has been disassembled;

FIG. 7 is an exploded view of the electric circular saw of FIG. 1 after removing a battery pack;

FIG. 8 is an exploded view of the electric circular saw of FIG. 7 after the removal of the handle;

fig. 9 is a perspective view of a motor and a heat radiating plate of the electric circular saw of fig. 7;

FIG. 10 is an exploded view of a heat radiating plate and a circuit board of the electric circular saw of FIG. 6;

FIG. 11 is an exploded view of the heat radiating plate and the circuit board of the electric circular saw of FIG. 10 from another perspective

Fig. 12 is a partially enlarged view of the electric circular saw of fig. 2 at a;

fig. 13 is a perspective view of the deflector cover of the electric circular saw of fig. 6 mounted to the heat radiating plate;

FIG. 14 is a perspective view of a disassembled portion of the housing of the electric circular saw of FIG. 1;

fig. 15 is a perspective view of a motor portion of the electric circular saw in fig. 12;

FIG. 16 is an exploded view of the electric circular saw of FIG. 13 with the motor removed from the air guide

Fig. 17 is a perspective view of a deflector of the electric circular saw of fig. 16;

FIG. 18 is a perspective view of the electric circular saw of FIG. 1 with the auxiliary handle detached;

fig. 19 is a sectional view of an auxiliary handle of the electric circular saw of fig. 18.

Detailed Description

The electric circular saw 100 shown in fig. 1 is used for a user to cut a member to be cut, for example, wood, plastic, stone, etc. may be cut by the user. As shown in fig. 1 to 2, the electric circular saw 100 includes: the electric circular saw comprises a housing 11, a saw blade 12, a motor 13, a power supply device 14 and a bottom plate 10, wherein the power supply device 14 comprises battery packs 141 for providing energy sources for the electric circular saw 100, in the embodiment, the number of the battery packs 141 is 1, and the saw blade 12 is a circular saw blade capable of rotating by taking the first axis 101 as an axis. For the clear explanation of the technical solution of the present invention, the following is also defined as shown in fig. 1: front, rear, upper and lower directions.

As shown in fig. 2 to 4, the housing 11 includes an accommodating portion 111 for accommodating the motor 13, and the accommodating portion 111 is formed with an inner cavity for placing the motor 13. The housing 11 also forms or is connected to a handle means 15 which can be gripped by a user. The handle device 15 specifically includes: a main handle 151 and an auxiliary handle 152. The accommodating portion 111 is located at one side of the saw blade 12, the main handle 151 is used for being held by one hand of a user to operate the electric circular saw 100, an operating switch 151a for controlling the start and stop of the electric circular saw 100 is further disposed on the main handle 151, and the auxiliary handle 152 is used for being held by the other hand of the user. The saw blade 12 cuts a workpiece while rotating about the first axis 101 with respect to the housing 11. The motor 13 includes a motor shaft 131 that is rotatable about a motor axis that is perpendicular to the first axis 101. The battery pack 141 can be detachably coupled to the housing 11 by a user to supply power to the motor 13. The base plate 10 comprises a base plate plane for contacting the workpiece, the base plate plane extending in a first plane 102.

Specifically, the receiving portion 111 extends substantially along a first line 103, the first line 103 being perpendicular to the first axis 101 of rotation of the blade 12. More specifically, the first straight line 103 extends in the front-rear direction. In this way, the electric motor 13 can also be arranged substantially in the direction of the first line 103 in the interior surrounded by the receptacle 111, so that the motor axis and the first line 103 can be substantially parallel to one another or coincide. In order to realize that the motor 13 can drive the saw blade 12 to rotate around the first axis 101, the electric circular saw 100 further comprises a worm and gear assembly 16 for realizing power transmission between the motor 13 and the saw blade 12.

The primary handle 151 includes a first grip portion 151b for being gripped by a user, the first grip portion 151b extending substantially along the first direction 105, the secondary handle 152 includes a second grip portion 152a for being gripped by a user, and the second grip portion 152a extending substantially along the second direction 106. Wherein the main grip 151 is further arranged symmetrically with respect to a symmetry plane 104, which symmetry plane 104 is perpendicular to the first axis 101. When the first plane 102 and the first axis 101 are parallel to each other and the distance between the first plane 102 and the first axis 101 is the closest, the symmetry plane 104 of the main handle 151 is also perpendicular to the first plane 102, the first direction 105 in which the first grip portion 151b extends obliquely intersects the plane of the base plate 10 at an angle of 30 ° or more and 60 ° or less, and then the second direction 106 in which the second grip portion 152a extends is parallel to the first plane 102 or intersects the first plane 102 at an angle of 0 ° or more and 20 ° or less, and the second direction 106 in which the second grip portion 152a extends also obliquely intersects the symmetry plane 104 at an angle of 50 ° or more and 70 ° or less, so that when the user grips the first grip portion 151b and the second grip portion 152a with both hands, respectively, the arm directions of both hands intersect. In fact, in a projection plane perpendicular to the first direction 105, the projections of the main handle 151 and the auxiliary handle 152 in the projection plane along the first direction 105 at least partially coincide, thereby making the arrangement of the main handle 151 and the auxiliary handle 152 more ergonomic.

As shown in fig. 5 to 6, the housing 11 is further formed with a coupling portion 112 for detachably coupling the battery pack 141, the coupling portion 112 is disposed at a lower end of the main handle 151, the main handle 151 connects the coupling portion 112 and the accommodating portion 111, and the coupling portion 112 also connects the main handle 151 and the accommodating portion 111, so that the main handle 151, the accommodating portion 111 and the coupling portion 112 are sequentially connected and surround an opening 117 through which a hand for a user to grip the first grip portion 151b is formed, the opening 117 is also located at a side of the motor 13 away from the worm gear assembly 16, that is, the motor 13 is disposed between the opening 117 and the worm gear assembly 16.

It is understood that the battery pack 141 may emit a large amount of heat while supplying power to the electric circular saw 100 to discharge electric power. In order to avoid the influence of the heat dissipated from the battery pack 141 on the output of the electric power of the battery pack 141, the heat dissipation of the battery pack 141 is also required. Since the battery pack 141 is disposed at the coupling portion 112 between the main handle 151 and the receiving portion 111. As shown in fig. 2, in order to dissipate heat of the motor 13, a fan 132 is further disposed at an end of the output shaft of the motor 13 away from the main handle 151, and when the motor 13 rotates at a high speed, air is blown out by the fan 132 to generate a heat dissipation airflow, so as to blow air to dissipate heat of the electric circular saw 100. As shown in fig. 1, the housing 11 is further formed with an airflow inlet 113 and an airflow outlet 114, wherein the airflow inlet 113 is disposed at one end of the accommodating portion 111 near the opening 117 in the direction of the first straight line 103, the airflow inlet 113 is open toward the rear end of the housing 11, and the airflow inlet 113 is also located between the battery pack 141 and the motor 13. The airflow outlet 114 is disposed on the accommodating portion 111, and the airflow outlet 114 is also located at an end of the motor 13 close to the worm and gear assembly 16, so that the heat dissipation airflow flowing from the airflow inlet 113 to the airflow outlet 114 can flow through the motor 13, thereby efficiently dissipating heat from the motor 13. Meanwhile, when the heat dissipation airflow flows into the inside of the housing 11 from the airflow inlet 113, the heat dissipation airflow can partially flow through the battery pack 141 outside the housing 11, so that a certain heat dissipation effect is also provided to the battery pack 141. In the present embodiment, the battery pack 141 is formed with a heat dissipation outlet 142 through which heat can be dissipated, and the coupling portion 112 is formed with a ventilation hole 112a that is engaged with the heat dissipation outlet 142. The heat in the battery pack 141 flows out of the heat dissipation outlet 142 of the body of the battery pack 141 and enters the inside of the housing 11 through the vent hole 112a of the joint portion 112, so as to flow out of the airflow outlet 114 with the heat dissipation airflow in the housing 11.

The housing 11 is further formed with a gear case 115 for accommodating a worm gear, and the gear case 115 is recessed with respect to the accommodating portion 111 in a radial direction perpendicular to the motor axis, so that the heat dissipating airflow flowing out from the airflow outlet 114 can flow through the outside of the gear case 115, thereby dissipating heat from the worm gear assembly 16 located inside the gear case 115. In the present embodiment, the gear case 115 and the accommodating portion 111 are integrally formed, and the inside of the gear case 115 and the inside of the accommodating portion 111 are communicated with each other, so that a part of the heat dissipating air flow passes through the inside of the gear case 115 and then flows out of the saw blade 12, thereby further dissipating heat from the worm and gear assembly 16.

In the present embodiment, the rated input power of the electric circular saw 100 is 1.3KW or more and 1.7KW or less, further, the rated input power of the electric circular saw 100 is 1.5KW, the diameter of the saw blade 12 is 0.15m or more and 0.21m or less, and further, the diameter of the saw blade 12 is 0.185 m. Therefore, in order to avoid the electric circular saw 100 being too large in size and heavy in weight and simultaneously satisfying the requirement of the capacity of the battery pack 141 in the power supply device, the ratio of the nominal voltage of the battery pack 141 to the weight of the electric circular saw 100 is greater than or equal to 6V/Kg and less than or equal to 12V/Kg. Further, the ratio of the nominal voltage of the battery pack 141 to the weight of the electric circular saw 100 is greater than or equal to 7.5V/Kg and less than or equal to 9V/Kg. In the present embodiment, the single battery pack 141 is composed of a plurality of battery cells, wherein the ratio of the number of battery cell nodes to the speed ratio of the worm gear is greater than or equal to 4 and less than or equal to 10. Preferably, the ratio of the number of the cell sections to the speed ratio of the worm gear is greater than or equal to 3 and less than or equal to 8. On the other hand, the ratio of the motor rotation speed to the reduction ratio of the worm gear is 4500 or more and 7500 or less. Preferably, the ratio of the motor speed to the reduction ratio of the worm gear is greater than or equal to 5000 and less than or equal to 7000. Like this, the nominal voltage of battery package 141 can be set up in a reasonable scope to satisfy the demand of the rated operating mode of complete machine, set up the rated capacity of battery package 141 according to this nominal voltage, can make this rated capacity satisfy under the condition that the discharge time of battery package 141 satisfies user's demand, can reduce the size of the complete machine of electric circular saw 100 and reduce the weight of electric circular saw 100 as far as possible. Therefore, the ratio of the nominal voltage of the battery pack 141 to the weight of the electric circular saw 100 in the present invention is a parameter for comprehensively balancing the load capacity, the working time, the size, the weight, and the like of the electric circular saw 100.

As shown in fig. 7 to 13, in order to control the motor 13 and the battery pack 141, the electric circular saw 100 further includes a circuit board 17, and the circuit board 17 is electrically connected to the motor 13 through a wire. The circuit board 17 is located in the accommodating portion 111, and the circuit board 17 is further disposed between the motor 13 and the airflow inlet 113, so that the heat dissipation airflow can sequentially flow through the circuit board 17 and the motor 13, and the heat dissipation airflow can also dissipate heat of the circuit board 17. In the present embodiment, the circuit board 17 includes a circuit substrate extending in a plane perpendicular to the axis of the motor, and the circuit substrate is substantially circular in order to match the shape of the accommodating portion 111, so that the space occupied by the circuit board 17 in the accommodating portion 111 can be reduced in the direction along the first straight line 103, the structural arrangement inside the accommodating portion 111 can be more compact, the size of the electric circular saw 100 in the direction of the motor shaft 131 can be reduced, the overall size of the electric circular saw 100 can be smaller, and the operation by the user can be more convenient.

As shown in fig. 8 to 11, the electric circular saw 100 further includes a heat radiating plate 18 that can further radiate heat from the circuit board 17. The heat dissipation plate 18 is disposed in the housing portion 111, and the heat dissipation plate 18 is also disposed between the airflow inlet 113 and the motor 13. The heat dissipation plate 18 includes a heat dissipation substrate 181 extending in a second plane 107 perpendicular to the motor axis, and the shape of the heat dissipation substrate 181 may be substantially the same as the shape of the circuit substrate, for example, in the present embodiment, the heat dissipation substrate 181 is also circular. The heat dissipating plate 18 further includes a side wall 182, the side wall 182 being distributed along an edge of the circular heat dissipating substrate 181, the side wall 182 further extending in a cylindrical plane around the axis of the motor, so that the heat dissipating substrate 181 and the side wall 182 surround a receiving space 183 formed for mounting the circuit board 17. A plurality of heat dissipation ribs 182a are formed on the side wall 182 at intervals in sequence, the heat dissipation ribs 182a extend in a direction parallel to the axis of the motor, an airflow channel 182b for guiding heat dissipation airflow to extend in a direction parallel to the axis of the motor is formed between two adjacent heat dissipation ribs 182a, and the airflow channel 182b also extends in a direction parallel to the axis of the motor. The heat dissipating ribs 182a can effectively increase the heat dissipating area of the heat dissipating plate 18, thereby increasing the heat dissipating efficiency. Preferably, the heat dissipation plate 18 is made of metal. On one hand, the metal piece has higher heat conductivity coefficient, and can take out heat on the circuit board 17 quickly; on the other hand, because the structural strength of metalwork is higher, can play certain supporting role in casing 11 is inside, when avoiding electric circular saw 100 to fall down from the eminence, destroy electric circular saw 100's complete machine structure or cause electric circular saw 100 inner structure impaired. In addition, the wires connecting the circuit board 17 and the motor 13 can be disposed in the airflow channel 182b formed between two adjacent heat dissipation ribs 182a, and the wires pass through the airflow channel 182b, so that the wires can be dissipated, fixed, and the structural arrangement inside the accommodating portion 111 can be more compact.

As shown in fig. 12, since the electric circular saw 100 generates a large amount of heat from the components such as the circuit board 17 and the motor 13 in the operating state, the heat generated from the circuit board 17 and the heat generated from the motor 13 affect each other by heat transfer. In the present embodiment, a heat insulation gap 171 is further provided between the circuit board 17 and the motor 13. The existence of this clearance 171 can make circuit board 17 and motor 13 contactless or direct contact not to do not produce the heat transfer or produce less heat exchange, and then can avoid the heat that circuit board 17 produced and the heat that motor 13 produced to influence each other, guarantee electric circular saw 100 long-term, effectual work. Specifically, in the present embodiment, since the circuit board 17 is mounted on the heat dissipation plate 18 and dissipates heat through the heat dissipation plate 18, the gap 171 is actually located between the heat dissipation plate 18 and the motor 13, and the distance is 0.5mm or more and 10mm or less. Therefore, the circuit board 17 is effectively ensured not to be in contact with the motor 13, and a proper gap is ensured between the circuit board 17 and the motor 13, so that excessive heat exchange is avoided.

As shown in fig. 7 to 8 and 13, in order to increase the flow velocity of the heat dissipation airflow in the accommodating portion 111 and to achieve better heat dissipation in cooperation with the heat dissipation plate 18, the electric circular saw 100 is further provided with a deflector cover 19. The diversion cover 19 is arranged between the airflow inlet 113 and the heat dissipation plate 18 and can rapidly guide the heat dissipation airflow from the airflow inlet 113 to the heat dissipation plate 18, so that the heat dissipation airflow is prevented from directly flowing through the circuit board 17 and the heat dissipation plate 18 from the airflow inlet 113, the flow speed of the heat dissipation air is reduced, and the heat dissipation efficiency is further reduced. Specifically, the deflector cover 19 is substantially hemispherical and substantially covers the receiving space 183 of the radiator plate 18 when it is fitted to the radiator plate 18. The deflector cover 19 is further formed or connected with a connection portion 191 for connecting with the heat radiating plate 18. When the deflector cover 19 is coupled to the heat sink 18, the circuit board 17 is positioned in the receiving space 183 formed by the heat sink 18. In addition, in order to meet the ventilation requirement of the heat dissipation plate 18, a through hole 192 is formed on the spherical surface of the deflector cover 19. The through hole 192 can, on the one hand, maintain the ventilation requirement of the circuit board 17 in the cooling air duct and, on the other hand, allow the wires connecting the circuit board 17 and the motor 13 to pass through.

When the electric circular saw 100 is operated, the heat dissipating air enters the accommodating portion 111 from the air inlet 113, first flows to the deflector cover 19, and under the guiding action of the deflector cover 19, most of the heat dissipating air flows directly to the heat dissipating plate 18, and rapidly flows to the motor 13 from the heat dissipating ribs 182a of the heat dissipating plate 18, and rapidly flows out from the air outlet 114 after flowing through the motor 13. When the heat dissipation airflow flows to the airflow guiding cover 19, at least a part of the heat dissipation airflow flows into the circuit board 17 through the through hole 192 of the airflow guiding cover 19, so as to ventilate the circuit board 17, and then flows out from the joint between the circuit board 17 and the heat dissipation plate 18 or the joint between the airflow guiding cover 19 and the heat dissipation plate 18. It will be appreciated that the deflector cover 19 in effect divides the space between the circuit board 17 and the airflow inlet 113 to avoid the flow of the heat dissipating airflow in a relatively open space resulting in a low flow rate. On the other hand, it is also possible to prevent the heat dissipation airflow from directly flowing onto the circuit board 17 and being dissipated from the periphery of the circuit board 17, thereby causing the flow rate of the heat dissipation airflow flowing between the heat dissipation ribs 182a of the heat dissipation plate 18 to be low and the flow rate to be low, further causing the heat dissipation efficiency of the heat dissipation plate 18 to be low, and causing the electric circular saw 100 to fail to normally operate for a long time because the heat of the circuit board 17 cannot be discharged.

As shown in fig. 14 to 17, in order to increase the blowing efficiency of the fan 132, in the present embodiment, the electric circular saw 100 is further provided with a deflector 21 for guiding the air discharged from the fan 132. Around the output shaft direction, the baffle 21 is arranged at least partially within the circumferential extent of the fan 132. In the present embodiment, since the gear case 115 is located at the front side of the fan 132 in the direction of the motor shaft 131, and the gear case 115 is actually integrally formed with the accommodating portion 111, it at least partially occupies the space at the front side of the fan 132 in the direction of the motor shaft 131, so that the air guide 21 is actually a circular arc segment located at the front side of the fan 132 and disposed around the motor shaft 131. The motor 13 is further provided with a windshield 22 around the fan 132. The windshield 22 mainly protects the fan 132. A circle of receiving groove is preset between the windshield 22 and the gear housing 115, and the guide member 21 is disposed in the receiving groove, so as to avoid other fixing members for fixing the guide member 21 to the electric circular saw 100.

As shown in fig. 16 to 17, specifically, the air guiding element 21 includes an air guiding blade 211 and an installation portion 212, and the installation portion 212 is fixedly disposed in the receiving groove and does not generate relative displacement. In fact, the mounting portion 212 is further formed with a catching groove for catching the deflector 21 in the receiving groove more stably. The wind guide blade 211 is connected to the mounting portion 212 and integrally formed with the mounting portion 212, but the wind guide blade 211 may be connected to the mounting portion 212 in a separately formed state. The flow guide member 21 comprises a fan blade air inlet end and a fan blade air outlet end, airflow flows from the fan blade air inlet end to the fan blade air outlet end, the fan blade air inlet end and the fan blade air outlet end are respectively positioned on two sides of the flow guide member 21 along the axial direction, and the air outlet end of the fan blade is close to the air outlet of the casing. The airflow passing through the fan 132 and the flow guide 21 flows out from the air outlet end of the fan blade, and the ratio of the average flow speed of the airflow at the air outlet end of the fan blade to the rated power of the cutting tool is greater than or equal to 13 m/s & lt kw, and less than or equal to 18 m/s & lt kw. More specifically, the maximum radius of the fan 132 is not less than 35mm and not more than 45mm within a circumferential range around the axis of the motor shaft 131; the maximum radius of the flow guide member 21 is 40mm or more and 50mm or less. Specifically, the maximum radius of the fan 132 is smaller than the maximum radius of the guide 21, and the ratio of the maximum radius of the fan 132 to the maximum radius of the guide 21 is 0.7 or more and 1.125 or less. In the case of the fan 132, the maximum radius is defined as the length of the center axis from the outermost edge of the fan 132. In fact, it can be understood that the size of the motor 13, and thus the size of the fan 132 and the size of the deflector 21, are different for different sizes of the electric circular saw 100, and are not limited to the above values. However, the maximum radius of the baffle 21 is always greater than the maximum radius of the fan 132. Based on the structural design of the fan blades and the air guide vanes 211, the air flow flows out from the air outlet end of the fan 132 and then flows to the worm wheel and the worm along the extending direction of the air guide vanes 211 of the air guide piece 21, so that the effects of guiding the air flow, changing the direction of the air flow, increasing the air volume and the air speed flowing through the worm wheel and the worm are achieved, and the heat dissipation of the worm wheel and the worm is better achieved.

In order to prevent dust generated by the cutting chips generated during the cutting process, the electric circular saw 100 of the present embodiment is further provided with a dust suction device, and the specific structure thereof is well known in the art and will not be described herein. As shown in fig. 3 to 4 and 18 to 19, the dust outlet 116 of the dust suction device in the present embodiment is provided on the upper side of the electric circular saw 100. The dust outlet 116 is disposed in a direction substantially coincident with a connection end 152b of the auxiliary handle 152 to the electric circular saw 100. In fact, in some preferred embodiments, the direction of the dust outlet 116 coincides with the second direction 106, and the auxiliary handle 152 is connected to the housing 11 of the electric circular saw 100 through the dust outlet 116. The auxiliary handle 152 is a hollow cylinder, one end of which is connected to the dust outlet 116, and the other end of which is formed with a dust outlet 152c, and the connecting end 152b is communicated with the dust outlet 152c and forms a continuous connecting channel, which is continuous and smooth. When the electric circular saw 100 is operated, a connection pipe (not shown) may be further connected to the dust outlet end 152c of the auxiliary handle 152, thereby discharging the debris to a predetermined place. The above-mentioned setting mode can be as one section connecting pipe with supplementary handle 152 itself and discharge the piece, and on the other hand avoids setting up other dust outlet 116 and causes electric circular saw 100 structure complicacy to the connecting pipe causes the influence to user operation electric circular saw 100 when the installation connecting pipe. The dust outlet 116 and the connection portion 191 connecting the auxiliary handle 152 to the electric circular saw 100 are disposed at the same position, and in fact, the space inside the auxiliary handle 152 is reused, so that the space utilization rate of the housing 11 is increased, and the structural complexity of the housing 11 is reduced.

It can be understood that when the electric circular saw 100 is in an operating state, the chips discharged through the auxiliary handle 152 may collide continuously to generate static electricity during a stroke from the connection end 152b to the dust discharge end 152c of the auxiliary handle 152, and a large charge difference may be formed between the connection end 152b of the auxiliary handle 152 and the dust discharge end 152c of the auxiliary handle 152 when particles carrying a large amount of charged particles move to the inner cavity of the auxiliary handle 152 due to the large amount of conductive material in the electric circular saw 100, so as to generate large static electricity. Due to the conductive property of the human body, the static electricity is directly transmitted through the hand of the user holding the auxiliary handle 152, so as to generate an electric shock to the user, and in a serious case, the large static electricity may cause damage to the internal components of the electric circular saw 100 and affect the operation of the user.

In view of the above, the present embodiment provides an auxiliary handle 152, in which antistatic particles are added to the handle material, thereby preventing static electricity from being generated when cutting collides with the inner wall of the auxiliary handle 152, and also eliminating static electricity generated when chips collide with each other. In order to further reduce the static electricity generated inside the auxiliary handle 152, a conductive member 152d is further disposed between the connection end 152b and the dust outlet end 152c of the auxiliary handle 152 and the dust outlet 116, and the conductive member 152d is uniformly distributed around the inner side of the auxiliary handle 152. The conductive member 152d can guide the charged particles at the high charge end between the connection end 152b and the dust outlet end 152c of the auxiliary handle 152 to move to the low charge end, and finally eliminate the potential difference between the connection end 152b and the dust outlet end 152c to reach the equipotential, thereby eliminating the static electricity.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It should be understood by those skilled in the art that the above embodiments do not limit the present invention in any way, and all technical solutions obtained by adopting equivalent replacement or equivalent transformation fall within the protection scope of the present invention.

Claims (10)

1. An electric circular saw comprising:

a saw blade rotatable about a first axis;

the motor comprises a motor shaft for driving the saw blade to rotate;

a housing formed with an accommodating part for accommodating the motor;

the dust collection device comprises a dust outlet arranged on the shell;

the method is characterized in that:

the housing further forms or is connected to:

the handle device is hollow and is provided with a dust outlet end and a connecting end, and at least part of the connecting end is communicated with the dust outlet; the dust suction device can discharge the cuttings through the dust outlet end of the handle device.

2. The electric circular saw of claim 1,

the handle device includes:

a main handle including a first grip portion for being held by one hand of a user;

an auxiliary handle including a second grip portion for being gripped by the other hand of the user;

the auxiliary handle is connected to the dust outlet.

3. The electric circular saw of claim 2,

the main handle extends in a first direction, the first direction being perpendicular to the first axis;

the auxiliary handle extends in a second direction that obliquely intersects the first direction.

4. The electric circular saw of claim 2,

the first holding part is symmetrically arranged about a symmetry plane, and the second holding part extends along a direction obliquely intersected with the symmetry plane;

the extending direction of the second holding part is obliquely intersected with the symmetry plane to form an included angle which is larger than or equal to 50 degrees and smaller than or equal to 70 degrees.

5. The electric circular saw of claim 3,

the dust outlet is arranged along the second direction and at least partially coincided with the auxiliary handle.

6. The electric circular saw of claim 2,

in a projection plane perpendicular to the first direction, the projection of the main handle and the auxiliary handle in the projection plane along the first direction at least partially coincide.

7. The electric circular saw of claim 1,

the dust outlet end is also connected with a connecting pipe for discharging chips.

8. The electric circular saw of claim 2,

the connecting channel between the dust outlet end and the connecting end is continuous and smooth.

9. The electric circular saw of claim 2,

and a conductive piece is connected between the dust outlet end and the connecting end.

10. The electric circular saw of claim 9,

the conductive pieces are uniformly distributed around the inner side of the auxiliary handle.

Images