CN115570631B - Miter saw and electric tool - Google Patents

Abstract

The invention discloses a miter saw and an electric tool, comprising: a housing; a cutting assembly coupled to the housing and having a saw blade for performing a cut, the saw blade rotating about a blade axis in a cutting plane; a motor having a motor shaft rotating about a motor axis for driving the saw blade to rotate; further comprises: the dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are connected in sequence, wherein the dust collection assembly is at least partially detachably connected to the miter saw, and the fan is in transmission connection with the motor shaft. The dust collection component provided by the invention is active dust collection, and the dust collection efficiency is high; the dust collection assembly is detachably connected to the miter saw so that a user can choose to fit or mount to other tools when buying the miter saw, and meanwhile, the miter saw is convenient to detach, repair and replace.

Description

Miter saw and electric tool

Technical Field

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

Background

Electric miter saws are often used for cutting wood and other materials, and wood chips and dust generated by cutting are harmful to human health. Most of the miter saws in the prior art are not provided with a dust collecting device, and even if the dust collecting device is provided, the dust collecting efficiency is low. Secondly, the miter saw integrated with the dust collecting device is inconvenient to detach, repair and replace parts, the cost of the whole machine is high, and when a user changes a cutting product, the miter saw with the dust collecting function needs to be purchased again, so that the purchase cost is increased.

Disclosure of Invention

In order to solve the defects of the prior art, the invention aims to provide a miter saw and an 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 scheme:

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

In some embodiments, the dust collection assembly includes a flexible shaft for transmitting rotation of the motor output to the fan, one end of the flexible shaft being connected to the fan, and the other end of the flexible shaft being 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 either side of the cutting plane.

In some embodiments, the dust collection channel comprises a first dust inlet and a first dust outlet, the first dust outlet is connected with the fan, and the first dust inlet is arranged at the rear of the saw blade.

In some embodiments, the fan comprises a housing and a fan body arranged in the housing, wherein a second dust inlet and a second dust outlet are arranged on the housing, the second dust inlet is connected with the dust collecting channel, and the second dust outlet is connected with 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 collection channel comprises a first dust collection channel and a second dust collection channel, the first dust collection channel and the second dust collection channel have the same dust inlet, the first dust collection channel and the second dust collection channel respectively have a first dust collection port and a second dust collection port, and the first dust collection port and the second dust collection port are both arranged at the rear of the saw blade and have different heights in the up-down direction.

In some embodiments, the first dust collection 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 and configured to perform a power tool operation; a motor for driving the tool assembly in motion; further comprises: the dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are connected in sequence, and the dust collection assembly is at least partially detachably connected to the electric tool; the dust collection assembly further comprises a flexible shaft used for transmitting 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 following advantages: the dust collection component provided by the invention is active dust collection, and the dust collection efficiency is high; the dust collection assembly is detachably connected to the miter saw so that a user can choose to fit or mount to other tools when buying the miter saw, and meanwhile, the miter saw is convenient to detach, repair and replace.

Drawings

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

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

Fig. 6 is a schematic view of a part of the mechanism of the second embodiment of the present invention.

Detailed Description

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

Example 1

As shown in fig. 1-2, a miter saw 10 of one embodiment, the miter saw 10 includes a body including a base 13, a robotic arm 12, and a frame 14, a motor 20, and a cutting assembly 11. For clarity of description of the technical solution in this embodiment, the following is defined as shown in the figure: front, back, left, right, up and down.

The base 13 is used to support the entire miter saw 10, and the entire miter saw 100 can be smoothly placed on the ground or an operating 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 assembly 11 and the motor 20. The cutting assembly 11 is used to perform the cutting function of the miter saw 10, and the cutting assembly 11 includes a saw blade having a circular shape. The saw blade has a cutting axis 102 passing through itself, the saw blade rotates about the cutting axis 102, the saw blade rotates in a cutting plane 101, the cutting axis 102 is perpendicular to the cutting plane 101.

The motor 20 is used to provide a power source for the cutting assembly 11. The motor 20 includes a motor shaft that drives the saw blade to rotate about the cutting axis 102, which is the motor axis 201. The saw blade cuts a workpiece placed on the table by being driven by the motor 20. Specifically, the motor shaft is connected to the center of rotation of the saw blade via 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 to or at an angle to the motor axis 201. The motor 20 is disposed above the cutting assembly 11, i.e., 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 that the projection of the center of gravity of other mechanisms of the miter saw except the base on the plane of the base falls in the base, and the miter saw is more stable to use.

The cutting assembly 11 and the motor 20 are fixed to the arm 12 by a frame 14. The frame 14 further comprises a handle 15. The handle 15 is used to move the arm 12 to move the cutting assembly 11 relative to the table. The handle 15 is disposed between the upper edge of the blade and the upper edge of the motor 20. Specifically, the motor is arranged at the front part of the motor 20 and is arranged closer to the motor 20, so that the force applied by a user is convenient.

The cutting assembly 11 further includes a shield 111 disposed on the outside of the blade 110, at least partially surrounding the blade 110, and having a small gap with the blade 110. Specifically, the cover 111 should cover at least one half of the circumference of the saw blade 110, at least one third of the area, and the cover area of the front side of the saw blade 110 should be one half or more of the total cover area. Further, a shield 111 is provided above the saw blade 110. The front side is wrapped more so that cutting dust can not be thrown to the direction of a user, and the cutting dust is matched with the dust collecting assembly to prevent dust from flying. In the uncut condition, the shield 111 prevents the saw blade 110 from being exposed to the extent that a user can directly contact. When the user operates the cutting assembly to move gradually closer to the workpiece for cutting, the shield 111 may move about an axis gradually away from the saw blade 110, thereby allowing the saw blade 110 to 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 under the cutting action of the saw blade 110, which affects the cutting operation of the user and also greatly affects the environment, so that the miter saw 10 is further provided with a dust collecting assembly during 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 sequentially connected. The dust collection passage 60 is connected to the frame 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's standing position, 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 collection passage 60 is provided at an end away from the user's standing position. The first dust inlet 62 is provided at the rear of the saw blade, and the height in the up-down direction is equal to or less than the height of the shield 111 at the lower edge of one side of the dust collection assembly.

The first dust outlet 61 is connected to the fan 40, and the fan 40 is rotated about the rotation axis 401 by the motor 20. Further, the rotational axis 401 is not coincident with the motor axis 201, i.e. the fan 40 is not coaxially connected to the motor 20, which is advantageous for achieving a detachable connection of the dust collecting 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 collecting passage 60 extends in a substantially up-down direction. Specifically, the dust collecting channel 60 may have a certain inclination angle or have a bend, 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 assembled or integrally formed. 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 blade edge. 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 63 is a bent structure. The second channel portion 64 includes a channel extending in a second direction and a channel extending in a third direction, the third direction being a direction parallel to the rotation axis 401 or having an included angle with the rotation axis 401 of 30 degrees or less, and the second channel portion 64 is substantially a bent structure oriented differently 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 collection assembly due to the suction airflow generated by the fan under the action of the motor. If the dust collecting channel is parallel to the workbench, the chips moving at high speed directly enter, and the structure of the fan can 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 also provided with a dust collection baffle 65 extending in a fourth direction which is perpendicular to the plane of the table or which is inclined relative to the plane of the table, most preferably in a direction tangential to the edge of the blade. The first channel portion 63 has a diameter-changing structure, that is, a diameter near the first dust inlet 62 is larger than a diameter near the second channel 64. In cooperation therewith, the dust collecting baffle 65 at least partially encloses the first dust inlet 62, in particular the dust collecting baffle 65 has an opening in the upper part of the first dust inlet 62. The end surface of the first dust inlet 62 is a tangential surface cut in a fifth direction, which is inclined to the front side of the miter saw with respect to the plane of the table. The combined structure can collect the cuttings thrown under the cutting centrifugal effect to the greatest 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 collecting passage 60 and the dust collecting chamber 50. The housing 41 has a volute shape, and includes a second dust inlet 43 and a second dust outlet 44. The second dust inlet 43 is coaxially arranged with the rotation axis 401, the second dust outlet 44 is arranged 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, and the fourth direction is tangential to the periphery of the fan 40. Negative pressure is formed at the axial line of the rotating shaft of the fan body, the cuttings sucked into the dust collecting channel are thrown to the periphery, namely, the side close to the inner wall of the shell under the action of centrifugal force after entering the fan, and then discharged from the second dust outlet 44 to the dust collecting cavity 50.

The fan 42 comprises a rotation center through which the rotation axis 401 passes, a connecting groove for connecting a transmission device is arranged at the rotation center, and a corresponding avoiding hole is arranged on the shell. In the present embodiment, the transmission device is a flexible shaft 30, which is a transmission shaft capable of undergoing flexible deformation. Specifically, the housing of the flexible shaft 30 is made of soft material, or hard material with special shape to make it have deformability, such as corrugated tube made of hard material, etc., without limitation. The center of the flexible shaft 30 is provided with a transmission shaft, and the transmission shaft 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 to be more favorable for realizing the transmission between the motor and the fan and also be more favorable for the disassembly and connection of the dust collection assembly. The flexible shaft 30 includes a first end 31 and a second end 32, the first end 31 is connected with the connecting slot, 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 with the connecting slot. The motor 20 drives the fan 40 to work, and the power of the motor is utilized, so that no additional power equipment is needed, and meanwhile, the active dust collection effect can be realized, and the dust collection efficiency can be improved to more than 90% compared with passive dust collection.

The fan 40, the dust collection channel 60 and the miter saw 10 are detachably connected, or the dust collection channel is fixed on the miter saw 10, and the fan 40 and the dust collection channel 60 are detachably connected. Generally, the dust collection assembly is at least partially removably attachable to the miter saw 10 such that the dust collection assembly is easily removable for maintenance, replacement, and adaptation to 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, in a detachable connection or a fixed connection. Further, the dust collection chamber 50 may be made of a rigid material or may be made of a flexible material, such as rubber or fabric.

The fan body 42 is located in a plane of rotation 402 and the motor 20 is located 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 parts as those of the first embodiment are given the same reference numerals, and only the differences from the first embodiment are described in the present embodiment for convenience of description.

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

The second dust collecting port 81 is provided below the first dust collecting port 71 at a position in the up-down direction, and both the first dust collecting port 71 and the second dust collecting 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 shroud 111. The second dust collection port 81 is formed by end surfaces 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 collecting passage 70 is larger than the average diameter of the second dust collecting passage 80. In the actual working process of the miter saw, under the centrifugal effect of high-speed rotation of the saw blade, the chips with different qualities are often brought to different heights to be separated from the saw blade, if only one dust collecting channel is arranged, the diameter of a dust inlet needs to be enlarged to improve the dust collecting efficiency, but the suction flow rate of a fan can be reduced due to the overlarge diameter, only one weighing value can be selected in practice, and the two dust collecting channels are arranged in the embodiment, so that the dust collecting efficiency can be improved, and more chips are often arranged at the position of the first dust collecting channel, so that the designed diameter of the first dust collecting channel is larger.

As shown in fig. 6, the first dust collecting passage 70 includes a first passage portion 700 and a second passage portion 710 which are connected. The second channel portion 710 is disposed at the end of the first dust collecting opening 71, and the second channel portion 710 extends along a third direction in the cutting plane, wherein the third direction is inclined towards the rear of the saw blade relative to the up-down direction, and an included angle between the third direction and the up-down direction is 0-30 degrees. In the present embodiment, the rotation plane of the fan is parallel to the cutting plane of the saw blade, so the first passage portion 700 sequentially includes a section perpendicular to the rotation plane, one end perpendicular to the plane of the second passage portion 710, and a curved section connecting the two sections. One end of the first channel 700 is the main dust outlet 72, 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 variable diameter structure in which the diameter is reduced from the first dust collection port 71 to the outlet section 711. Specifically, the width of the inlet section 712 in the front-rear direction and the width in the left-right direction become gradually larger.

The second channel portion 710 is at least partially disposed in the shroud 111, and one end of the first channel portion 700 extends into the shroud 111 to connect with the second channel portion 710. In particular, the outlet section 711 is at least mostly provided within the shroud 111, and thus its diameter should be adapted to 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 saw blade 110. Specifically, the orthographic projection of the inlet section 712 in the cutting plane is at least partially coincident with the saw blade 110, the inlet section 712 is provided with a groove for accommodating a portion of the saw blade 110, and the left and right walls of the groove cover a portion of the saw blade 110, i.e., the end face of the first dust collecting port 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 direction of the inclined cutting edge which is inclined left and right outwards, and the two parts of the groove which are protruded left and right can collect the cuttings, 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 by a drive shaft 30', the motor axis being parallel to the rotation axis. In this embodiment, due to the layout factor of the whole machine structure, the motor axis 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, where the motor axis does not coincide with the rotation axis, the projection of the fan on the plane of the table coincides with the projection of the motor on the plane, or the projection of the fan on the plane perpendicular to the front-rear direction coincides with the projection of the motor on the plane, the transmission shaft 30' may be a flexible shaft 30.

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 has shown and described the basic principles, principal features and advantages of the invention. It will be appreciated by persons skilled in the art that the above embodiments are not intended to limit the invention in any way, and that all technical solutions obtained by means of equivalent substitutions or equivalent transformations fall within the scope of the invention.

Claims (10)

1. A miter saw, comprising:

A housing;

a cutting assembly coupled to the housing and having a saw blade for performing a cut, the saw blade rotating about a blade axis in a cutting plane;

a motor having a motor shaft rotating about a motor axis for driving the saw blade to rotate;

Characterized by further comprising:

The dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are sequentially connected, wherein the fan is detachably connected to the miter saw, and the fan is connected with the motor shaft through flexible shaft transmission.

2. The miter saw of claim 1, wherein one end of said flexible shaft is connected to said fan and the other end of said flexible shaft is detachably connected to said motor.

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

4. A miter saw according to claim 1, wherein said motor is at least partially located on either side of said cutting plane.

5. The miter saw of claim 1, wherein said dust collection channel includes a first dust inlet and a first dust outlet, said first dust outlet being connected to said fan, said first dust inlet being located rearward of said saw blade.

6. The miter saw of claim 1, wherein the fan includes a housing and a fan body disposed within the housing, a second dust inlet and a second dust outlet are disposed on the housing, the second dust inlet is connected to the dust collection channel, and the second dust outlet is connected to the dust collection chamber.

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

8. The miter saw of claim 1, wherein the dust collection channel includes a first dust collection channel and a second dust collection channel, the first dust collection channel and the second dust collection channel having a same dust inlet, the first dust collection channel and the second dust collection channel having a first dust collection port and a second dust collection port, respectively, the first dust collection port and the second dust collection port being disposed rearward of the saw blade and having different heights in an up-down direction.

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

10. A power tool, comprising:

A housing;

a tool assembly connected to the housing and configured to perform a power tool operation;

a motor for driving the tool assembly in motion;

Characterized by further comprising:

The dust collection assembly comprises a dust collection channel, a fan and a dust collection cavity which are sequentially connected, and the fan is detachably connected to the electric tool; the dust collection assembly further comprises a flexible shaft used for transmitting 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.