CN115570631A

CN115570631A - Miter saw and electric tool

Info

Publication number: CN115570631A
Application number: CN202110760650.6A
Authority: CN
Inventors: 付祥青; 陈亮; 潘华平
Original assignee: Nanjing Chervon Industry Co Ltd
Current assignee: Nanjing Chervon Industry Co Ltd
Priority date: 2021-07-06
Filing date: 2021-07-06
Publication date: 2023-01-06
Anticipated expiration: 2041-07-06
Also published as: TWM632354U; CN115570631B

Abstract

The invention discloses a miter saw and an electric tool, comprising: a housing; a cutting assembly connected to the housing and having a blade for cutting, the blade rotating about a blade axis in a cutting plane; the motor is provided with a motor shaft rotating around a motor axis and used for driving the saw blade to rotate; further comprising: the dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are connected in sequence, at least part of the dust collection assembly is detachably connected to the miter saw, and the fan is in transmission connection with the motor shaft. The dust collecting component of the invention is active dust collection, and the dust collection efficiency is high; the dust collection assembly is removably attachable to the miter saw so that the user can select for purchase or install the miter saw on other tools while facilitating removal for maintenance and replacement.

Description

Miter saw and electric tool

Technical Field

The invention relates to an electric tool, in particular to an inclined saw.

Background

Electric miter saws are commonly used for cutting wood and other materials, and wood chips and dust generated by cutting are harmful to human health. Most of the prior art miter saws are not provided with a dust collecting device, and even if the dust collecting device is arranged, the dust collecting efficiency is lower. Secondly, the miter saw of integrated dust collecting device is inconvenient to dismantle maintenance, change the part, and whole quick-witted cost is higher, and the user when changing the cutting product, and need choose the miter saw that has the dust collection function again, has increased the purchase cost.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide the miter saw and the electric tool which have wide applicability and high dust collection efficiency.

In order to achieve the above object, the present invention adopts the following technical solutions:

a miter saw, comprising: a housing; a cutting assembly connected to the housing and having a blade for cutting, the blade rotating about a blade axis in a cutting plane; the motor is provided with a motor shaft rotating around a motor axis and used for driving the saw blade to rotate; further comprising: the dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are connected in sequence, at least part of the dust collection assembly is detachably connected to the miter saw, and the fan is in transmission connection with the motor shaft.

In some embodiments, the dust collecting assembly includes a flexible shaft for transmitting the rotation output by the motor to the fan, wherein one end of the flexible shaft is connected to the fan, and the other end of the flexible shaft is detachably connected to the motor.

In some embodiments, the motor axis is not coincident with the blade axis.

In some embodiments, the motor is located at least partially on both sides of the cutting plane.

In some embodiments, the dust collecting channel includes a first dust inlet and a first dust outlet, the first dust outlet is connected to the fan, and the first dust inlet is disposed behind the saw blade.

In some embodiments, the fan includes a housing and a fan body disposed in the housing, the housing is provided with a second dust inlet and a second dust outlet, the second dust inlet is connected to the dust collecting channel, and the second dust outlet is connected to the dust collecting cavity.

In some embodiments, the second dust inlet is disposed coaxially with the rotation center of the fan, and the second dust outlet is disposed on the outer periphery of the fan.

In some embodiments, the dust collecting passage includes a first dust collecting passage and a second dust collecting passage, the first dust collecting passage and the second dust collecting passage have the same dust inlet, the first dust collecting passage and the second dust collecting passage respectively have a first dust collecting opening and a second dust collecting opening, and the first dust collecting opening and the second dust collecting opening are both disposed behind the saw blade and have different heights in the up-down direction.

In some embodiments, the first dust collecting port is provided with a groove, and the saw blade is arranged in the groove and has a gap with the groove.

A power tool, comprising: a housing; a tool assembly connected to the housing for performing power tool operations; a motor for driving the tool assembly to move; further comprising: the dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are connected in sequence, and at least part of the dust collection assembly is detachably connected to the electric tool; the dust collection assembly further comprises a flexible shaft used for transmitting the rotation output by the motor to the fan, one end of the flexible shaft is connected with the fan, and the other end of the flexible shaft is detachably connected with the motor.

Compared with the prior art, the invention has the advantages that: the dust collecting component of the invention is active dust collection, and the dust collection efficiency is high; the dust collection assembly is removably attachable to the miter saw so that the user can select for purchase or install the miter saw on other tools while facilitating removal for maintenance and replacement.

Drawings

FIG. 1 is a schematic structural diagram of a first embodiment of the present invention;

FIG. 2 is a top view of a first embodiment of the present invention;

FIG. 3 is a schematic view of a dust collecting assembly according to a first embodiment of the present invention;

FIG. 4 is a front view of a second embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a second embodiment of the present invention;

fig. 6 is a partial mechanism schematic diagram of the second embodiment of the invention.

Detailed Description

The invention is described in detail below with reference to the figures and the embodiments.

Example one

As shown in fig. 1-2, an embodiment of a miter saw 10 includes a body, a motor 20, and a cutting assembly 11, the body including a base 13, a robotic arm 12, and a frame 14. To clearly illustrate the technical solution in the present embodiment, the following is defined as shown in the drawings: front, back, left, right, up and down.

The base 13 is used to support the whole miter saw 10, and the whole miter saw 100 can be stably placed on the ground or an operation plane through the base 13. The base also comprises a workbench, and the plane of the workbench is parallel to the placed operation plane.

One end of the mechanical arm 12 is connected with the base 13, and the other end is connected with the cutting component 11 and the motor 20. The cutting assembly 11 is used to perform the cutting function of the miter saw 10. The cutting assembly 11 includes a circular saw blade. The saw blade has a cutting axis 102 through it, and the saw blade rotates about the cutting axis 102, the saw blade rotating in a cutting plane 101, the cutting axis 102 being perpendicular to the cutting plane 101.

The motor 20 is used for providing a power source for the cutting assembly 11, and the motor 20 includes a motor shaft capable of driving the saw blade to rotate around the cutting axis 102, which is the motor axis 201. Under the drive of the motor 20, the saw blade cuts the workpiece placed on the workbench. In particular, the motor shaft is connected to the center of rotation of the saw blade through a transmission. It will be appreciated that the cutting axis 102 is not coaxial with the motor axis 201. Further, the cutting axis 102 is parallel or at an angle to the motor axis 201. The motor 20 is disposed above the cutting assembly 11, that is, the height of the motor 20 in the up-down direction is higher than the height of the cutting assembly 11. Further, the motor 20 is at least partially located on both sides of the cutting plane 101, i.e. the cutting plane 101 passes through the motor 20, and most preferably, the motor is symmetrically arranged with respect to the cutting plane 101, so as to ensure that the projection of the total gravity center of other mechanisms of the miter saw base on the plane of the base falls within the base, and thus, the miter saw is more stable in use.

The cutting assembly 20 and the motor 20 are fixed to the robot arm 12 through a frame 14, and the frame 14 further includes a handle 15, and the handle 15 is used for moving the robot arm 12 to move the cutting assembly 11 relative to the worktable. The handle 15 is disposed between the upper edge of the blade and the upper edge of the motor 20. Specifically, the device is arranged at the front part of the motor 20 and is arranged closer to the motor 20, so that the user can exert force conveniently.

The cutting assembly 11 further includes a shield 111 disposed outside the blade 110, at least partially surrounding the blade 110, and having a slight clearance from the blade 110. Specifically, the shield 111 should cover at least one half of the circumference and at least one third of the area of the saw blade 110, and the area of the front side of the saw blade 110 should occupy one half or more of the total area. Further, a guard 111 is provided above the saw blade 110. The front side is wrapped up in more and is made the cutting dust can not get rid of to user's place direction, with the cooperation of collection dirt subassembly, prevents that the dust from flying upward. In the uncut state, the guard 111 prevents the blade 110 from being exposed to direct contact by the user. When the user operates the cutting assembly to move closer to the workpiece for cutting, the shield 111 can move around an axis and away from the saw blade 110, so that the saw blade 110 can normally contact the workpiece for cutting.

When a user performs a cutting operation, a large amount of chips are generated on the surface of the workpiece by the cutting action of the saw blade 110, which greatly affects the environment while affecting the cutting operation of the user, so that the miter saw 10 is further provided with a dust collection assembly during the operation.

As shown in fig. 1 to 3, the dust collection assembly includes a dust collection passage 60, a fan 40, and a dust collection chamber 50, which are connected in series. The dust collecting passage 60 is connected to the housing 14 and is provided with a first dust inlet 62 and a first dust outlet 61, and a continuous passage is formed between the first dust inlet 62 and the first dust outlet 61. The first dust inlet 62 is provided at the rear of the saw blade, which is generally configured to rotate in a direction away from the user standing, i.e., when the user stands in front of the saw blade 110, the saw blade 110 rotates in a clockwise direction, and the dust collecting passage 60 is provided at an end away from the user standing. The first dust inlet 62 is disposed behind the saw blade, and the height in the vertical direction is less than or equal to the height of the lower edge of the shield 111 on the dust collecting assembly side.

The first dust outlet 61 is connected to the fan 40, and the fan 40 is driven by the motor 20 to rotate around the rotation axis 401. Further, the non-coincidence of the axis of rotation 401 with the motor axis 201, i.e., the non-coaxial coupling of the fan 40 with the motor 20, facilitates the detachable coupling of the dirt collection assembly. The rotation axis 401 is higher than the cutting axis 102, i.e., the fan 40 is disposed above the cutting axis 102 such that the dust collection passage 60 extends substantially in the up-down direction. Specifically, the dust collecting channel 60 may have a certain inclination angle or a certain bending angle, as shown in fig. 3, the dust collecting channel 60 includes a first channel portion 63 and a second channel portion 64, the first channel portion 63 has a first dust inlet 62, the second channel portion 64 has a first dust outlet 61, and the first channel portion 63 and the second channel portion 64 are formed by assembling or integrally molding. The first channel portion 63 includes a channel extending in the first direction and a channel extending in the second direction. The first direction is parallel to the plane of the table or at an angle of less than 60 degrees to the plane of the table, and most preferably the first direction is tangential to the edge of the blade. The included angle between the second direction and the plane of the working table is greater than or equal to 60 degrees and less than or equal to 90 degrees, and the first channel part 63 is substantially a bent structure. The second channel portion 64 includes a channel extending in the second direction and a channel extending in a third direction, the third direction is a direction parallel to the rotation axis 401 or an angle between the third direction and the rotation axis 401 is less than or equal to 30 degrees, and the second channel portion 64 is substantially in a bending structure with a different orientation from the first channel portion. Under the action of high-speed rotation of the saw blade, the cuttings tend to have a larger speed, and in addition, the cuttings can quickly enter the dust collecting assembly due to the suction airflow generated by the fan under the action of the motor. If the dust collecting passage is arranged parallel to the table, the chips moving at high speed directly enter, and the structure of the fan may be damaged. Therefore, the longitudinally extending dust collecting channel or deformation structure can reduce the momentum of the chips by the impact of the chips on the inner wall of the channel, thereby decelerating the chips.

The first dust inlet 62 is further provided with a dust collecting baffle 65 extending in a fourth direction perpendicular to the plane of the table or inclined with respect to the plane of the table, most preferably tangential to the edge of the saw blade. The first passage portion 62 has a diameter-variable structure, i.e., the diameter of the first passage portion is larger than that of the second passage portion 64. In cooperation therewith, the dust collection baffle 65 at least partially surrounds the first dust inlet 62, and specifically, the dust collection baffle 65 has an opening at an upper portion of the first dust inlet 62. The end face of the first dust inlet 62 is a tangent plane cut along a fifth direction, and the fifth direction is inclined to the front side of the miter saw relative to the plane of the workbench. The combined structure can collect the chips thrown out under the action of cutting centrifugation to the maximum extent.

The fan 40 includes a housing 41 and a fan body 42 disposed in the housing 41, and the housing 41 connects the dust collection passage 60 and the dust collection chamber 50. The housing 41 is in the shape of a volute and includes a second dust inlet 43 and a second dust outlet 44. The second dust inlet 43 is coaxial with the rotation axis 401, and the second dust outlet 44 is disposed on the periphery of the fan, specifically, the second dust outlet 44 extends along a fourth direction, the fourth direction is perpendicular to the rotation axis 401 or has a certain included angle with the rotation axis 401, and the fourth direction is tangential to the periphery of the fan 40. The axial line of the rotary shaft of the fan body forms negative pressure to suck the cutting chips in the dust collecting channel, and the cutting chips are thrown to the periphery, namely close to the inner wall side of the shell body, under the action of centrifugal force after entering the fan, and then are discharged to the dust collecting cavity 50 from the second dust outlet 44.

The sector 42 comprises a rotation center through which the rotation axis 401 passes, the rotation center is provided with a connection groove for connecting a transmission device, and the shell is provided with a corresponding avoidance hole. In this embodiment, the transmission device is a flexible shaft 30, and the flexible shaft is a transmission shaft capable of being flexibly deformed. Specifically, the outer shell of the flexible shaft 30 is made of a soft material, or a hard material with a special shape to make it have a deformability, such as a corrugated tube made of a hard material, which is not limited herein. The center of the flexible shaft 30 is provided with a transmission shaft which deforms and rotates in the shell. When the motor and the fan are not coaxial, namely the motor 20 and the fan 40 have a certain distance, the flexible shaft is arranged, so that the transmission between the motor and the fan is more favorably realized, and the disassembly and connection of the dust collection assembly are more favorably realized. The flexible shaft 30 comprises a first end 31 and a second end 32, the first end 31 is connected with the connecting groove, and the second end 32 is detachably connected with the motor shaft. The fan 40 further includes a fastener 45, the fastener 45 fixedly connecting and sealing the first end 31 to the connecting slot. The motor 20 drives the fan 40 to work, power of the motor is utilized, power equipment does not need to be additionally arranged, active dust collection can be achieved, and dust collection efficiency can be improved to be more than 90% compared with passive dust collection.

The fan 40, the dust collecting passage 60 and the miter saw 10 are detachably connected, or the dust collecting passage is fixed on the miter saw 10 and the fan 40 is detachably connected with the dust collecting passage 60. In general, the dust collection assembly is at least partially removably coupled to the miter saw 10 such that the dust collection assembly is easily removed for maintenance, replacement, and for accommodating a variety of tools.

The dust collecting chamber 50 comprises a third dust inlet 51, and the third dust inlet 51 is connected to the second dust outlet 44, specifically, detachably or fixedly connected. Further, the dust chamber 50 may be made of a hard material or a flexible material, such as rubber or fabric.

The fan body 42 of the fan lies in a plane of rotation 402 and the motor 20 lies at least partially on either side of the plane of rotation. Further, the rotation plane 402 is not coincident with the cutting plane 101, i.e. the cutting plane 101 is located near the right end of the motor and the rotation plane 402 is located near the left end of the motor 20.

Example two

As shown in fig. 4 to 6, the same or similar components in the present embodiment are numbered the same as those in the first embodiment, and for convenience of description, only the differences from the first embodiment will be described in the present embodiment.

As shown in fig. 4, the dust collecting passage of the dust collecting assembly includes a first dust collecting passage 70 and a second dust collecting passage 80, one end of the first dust collecting passage 70 is connected to one end of the second dust collecting passage 80, and the first dust collecting passage 70 and the second dust collecting passage 80 have the same dust outlet, and the other end of the first dust collecting passage is connected to a first dust collecting port 71 and a second dust collecting port 81, respectively, that is, the dust collecting passage is connected to the fan 40 in a bifurcated manner. Specifically, the primary dust outlet 72 formed in the primary dust collecting passage is connected to the secondary dust inlet 43 of the fan, and the secondary dust outlet 82 at one end of the secondary dust collecting passage 80 is directly connected to a duct near the primary dust inlet 72. In other embodiments, the primary dust outlet 72 and the secondary dust outlet 82 may be connected in parallel to the second dust inlet 43, or the secondary dust outlet 82 is connected to a middle section of the first dust collecting passage 70, which is not limited herein.

The second dust collection port 81 is provided below the first dust collection port 71 at a position in the vertical direction, and both the first dust collection port 71 and the second dust collection port 81 are provided at the rear end of the saw blade 110. Specifically, the second dust collection port 81 is provided on the table, and the first dust collection port 71 is provided below the hood 111. The second dust collection port 81 is formed of an end surface extending in two directions, the first direction being a direction substantially tangential to the saw blade, and the second direction being a direction substantially perpendicular to the plane of the table. Further, in the present embodiment, the average diameter of the first dust collection passage 70 is larger than the average diameter of the second dust collection passage 80. In the mitre saw actual work in-process, under the centrifugal action of saw bit high-speed rotation, the smear metal of different quality is often taken to different height and breaks away from the saw bit, if only set up a collection dirt passageway, want to improve collection dust efficiency, need enlarge the diameter of income dirt mouth, but too big diameter also can subdue the suction flow rate of fan, can only select the numerical value of a trade-off in the reality, and this embodiment sets up two collection dirt passageways, can improve collection dust efficiency, and first collection dirt passageway position often has more smear metal, so first collection dirt passageway is bigger by the diameter of design.

As shown in fig. 6, the first dust collection passage 70 includes a first passage portion 700 and a second passage portion 710 which are provided in connection. The second passage part 710 is provided at an end of the first dust collection port 71, and the second passage part 710 extends in a third direction in the cutting plane, the third direction being inclined toward the rear of the saw blade with respect to the up-down direction at an angle of 0 to 30 ° with respect to the up-down direction. In this embodiment, the rotation plane of the fan is parallel to the cutting plane of the saw blade, so the first channel portion 700 sequentially includes a segment perpendicular to the rotation plane, an end perpendicular to the plane of the second channel portion 710, and a curved segment connecting the two segments. One end of the first channel 700 is the main dust outlet 82, and the other end is connected to the second channel 710. The second passage portion 710 includes an outlet section 711 connected to the first passage portion 700 and an inlet section 712 provided near the first dust collection port 71. The diameter of the inlet section 712 is larger than that of the outlet section 711, and the inlet section 712 is generally a diameter-variable structure that is reduced from the first dust collection port 71 to the outlet section 711. Specifically, the inlet section 712 has a gradually increasing width in both the front-rear direction and the left-right direction.

The second channel portion 710 is at least partially disposed in the shield 111, and one end of the first channel portion 700 extends into the shield 111 to connect with the second channel portion 710. In particular, the outlet section 711 is at least largely disposed within the shroud 111 and therefore has a diameter that accommodates the width within the shroud 111.

As shown in fig. 5, the orthographic projection of the second channel portion 710 in the cutting plane at least partially coincides with the blade 110. Specifically, the orthographic projection of the inlet section 712 in the cutting plane at least partially coincides with the saw blade 110, a groove for accommodating a part of the saw blade 111 is arranged on the inlet section 712, and the left and right wall surfaces of the groove coat the part of the saw blade 111, that is, the end surface of the first dust collecting opening 71 is concave. Because the saw blade has a certain thickness, and the cutting edge of the saw blade is inclined, the cuttings can be thrown out along the inclined cutting edge towards the left and right outer inclined directions, and the cuttings can be collected by the left and right protruding parts of the groove, so that the dust collection efficiency is further improved, and the space is saved.

As shown in fig. 6, the motor 20 is connected to the fan 40 through a drive shaft 31, with the motor axis parallel to the axis of rotation. In this embodiment, due to the structural layout factor of the whole machine, the axis of the motor is overlapped with the rotation axis, that is, the transmission shaft is overlapped with the two axes, and a transmission device is arranged between the fan and the motor and is in transmission connection with the motor and the saw blade. In other embodiments, the axis of the motor is not coincident with the rotation axis, the projection of the fan on the plane of the worktable is coincident with the projection of the motor on the plane, or the projection of the fan on the plane perpendicular to the front-back direction is coincident with the projection of the motor on the plane, and then the transmission shaft 31 may be a flexible shaft.

In this embodiment, the fan 40 and the dust collecting channel are detachably connected with other structures of the miter saw 10, so that the dust collecting assembly has high adaptability and is convenient to detach, replace and maintain. The second dust outlet 44 of the fan is connected to a dust collecting chamber 50 (not shown), which is detachably connected to the fan.

The foregoing shows and describes the general principles, principal features and advantages of the 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 using equivalent alternatives or equivalent variations fall within the scope of the present invention.

Claims

1. A miter saw, comprising:

a housing;

a cutting assembly connected to the housing and having a blade for cutting, the blade rotating about a blade axis in a cutting plane;

the motor is provided with a motor shaft rotating around a motor axis and used for driving the saw blade to rotate;

it is characterized by also comprising:

the dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are connected in sequence, at least part of the dust collection assembly is detachably connected to the miter saw, and the fan is in transmission connection with the motor shaft.

2. The miter saw of claim 1, wherein said dust collection assembly includes a flexible shaft for transmitting rotation output from a motor to a fan, one end of said flexible shaft being connected to said fan, the other end of said flexible shaft being detachably connected to said motor.

3. The miter saw of claim 1, wherein said motor axis is not coincident with said blade axis.

4. The miter saw of claim 1, wherein said motor is located at least partially on both sides of said cutting plane.

5. The miter saw of claim 1, wherein said dust channel includes a first dust inlet and a first dust outlet, said first dust outlet is connected to said fan, said first dust inlet is disposed behind said saw blade.

6. The miter saw of claim 1, wherein the fan includes a housing and a fan body disposed in the housing, the housing has a second dust inlet and a second dust outlet, the second dust inlet is connected to the dust collecting channel, and the second dust outlet is connected to the dust collecting chamber.

7. The miter saw of claim 6, wherein the second dust inlet is disposed coaxially with the rotation center of the fan, and the second dust outlet is disposed on an outer periphery of the fan.

8. The miter saw of claim 1, wherein the dust collecting channel comprises a first dust collecting channel and a second dust collecting channel, the first dust collecting channel and the second dust collecting channel have the same dust inlet, the first dust collecting channel and the second dust collecting channel respectively have a first dust collecting opening and a second dust collecting opening, and the first dust collecting opening and the second dust collecting opening are both arranged behind the saw blade and have different heights in the vertical direction.

9. The miter saw of claim 8, wherein said first dust collection port includes a recess, and said saw blade is disposed in said recess with a gap therebetween.

10. A power tool, comprising:

a housing;

a tool assembly connected to the housing for performing power tool operations;

a motor for driving the tool assembly to move;

it is characterized by also comprising:

the dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are connected in sequence, and at least part of the dust collection assembly is detachably connected to the electric tool; the dust collection assembly further comprises a flexible shaft used for transmitting the rotation output by the motor to the fan, one end of the flexible shaft is connected with the fan, and the other end of the flexible shaft is detachably connected with the motor.