Electric circular saw with dust collection and heat dissipation functions

Abstract

The invention discloses an electric circular saw with dust collection and heat dissipation functions, a dust collection and heat dissipation mechanism of the electric circular saw comprises a bevel gear arranged on an output shaft and a fan assembly arranged on the output shaft, the fan assembly constructs two channels in a shell and is provided with two sets of fans, one set of fans generates suction air for dust collection and heat dissipation, and the other set of fans generates suction air for dust collection and heat dissipation. And the other set of fan is used for assisting heat dissipation. Suction air is generated in the shell by arranging the dust collection and heat dissipation mechanism, then the dust collection box is connected through the pipeline so that waste chips and dust generated by cutting can be sucked into the dust collection box, and the generated suction air is used for heat dissipation of the motor and the circuit board in the first channel and then is discharged from the heat dissipation holes; meanwhile, after locking, the outer blades revolve along with the outer fixing ring to generate air flow in the second channel, the direction of the air flow is related to the deflection angle of the outer blades, heat dissipation can be conducted on the motor and the circuit board no matter how the direction of the air flow is, and double heat dissipation can guarantee that the motor works at the optimal temperature.

Description

Technical Field

[0001] The present invention relates to a handheld electric saw, and more particularly to a circular saw with dust suction and heat dissipation functions. Background Art

[0002] In recent years, the number of users of handheld circular saws has been increasing, and the functions of handheld power circular saws have also been increasing. During use, both the motor and the circuit board generate a large amount of heat. If this heat can be discharged in a timely and effective manner, it will greatly affect the lifespan of the motor and components, and may even damage the motor and components, resulting in the inability of the handheld power tool to work properly.

[0003] Currently, for dust suction of electric saws, an external vacuum cleaner is usually used. For example, the dust suction structure disclosed in the following website https: / / www.bilibili.com / video / BV1fZ421p7Cb / . The electric saw in this video is used in cooperation with an external vacuum cleaner by setting a connecting pipe on the housing and using a hose. However, the advantage of a handheld electric saw is its flexibility and portability. If it does not have a dust collection function itself, it is necessary to carry an additional set of dust suction devices each time it is used, losing its convenient advantage. Summary of the Invention

[0004] Based on the deficiency that electric saws in the prior art need to cooperate with external dust suction devices for dust collection, which makes the handheld electric saw lose its portable advantage, the present invention provides a circular saw with dust suction and heat dissipation functions.

[0005] The technical solution adopted by the present invention to solve the above technical problems is as follows: A circular saw with dust suction and heat dissipation functions, which includes:

[0006] A motor;

[0007] A circuit board, which is connected to the motor and the power supply for controlling the operation of the motor;

[0008] An output shaft, which is driven by the motor;

[0009] A saw blade, which is detachably arranged on the output shaft;

[0010] A housing, on one side of which there is a hollow cylindrical body for installing the motor and the circuit board. The outer end of the cylindrical body is provided with an outer sealing plate with heat dissipation holes, and the inner end of the cylindrical body is provided with a sealed inner sealing plate. The output shaft penetrates through the inner sealing plate and is rotationally and sealingly connected to the inner sealing plate. The inner side wall is provided with an annular mounting table, and the side wall of the housing outside the mounting table is provided with multi-purpose holes;

[0011] A protective cover, which is arranged on the housing. On one side of it, there is a dust collection box with an inner cavity. The inner cavity wall of the dust collection box is provided with a feeding hole extending to the outside of the cutting blade. The inner cavity wall of the dust collection box is also provided with a suction port, and the suction port is connected to the inside of the housing through a pipeline;

[0012] A dust suction and heat dissipation mechanism, which includes a fan assembly arranged inside a housing. The fan assembly includes an inner fixing ring fixedly connected to an output shaft, inner blades arranged on the inner fixing ring, an outer fixing ring fixed to the outer ends of the inner blades and driven by a motor, outer blades rotatably arranged on the outer fixing ring through a rotating shaft, and a planetary gear set arranged inside the outer fixing ring and drivingly connected to the outer fixing ring. A bevel gear is provided on the axle of the sun gear in the planetary gear set, and a bevel gear is provided at the inner end of the rotating shaft. The bevel gear meshes with the bevel gear so that the outer blades rotate around their own axes while revolving around the output shaft. The inner blades and the outer blades are arranged in a staggered manner in the axial direction of the output shaft. The outer fixing ring is rotatably arranged on the mounting table through a sealed bearing, so that a first channel and a second channel are respectively formed inside and outside the outer fixing ring. The first channel is used to generate suction to suck the waste chips generated by cutting and dissipate heat from the motor and the circuit board, and the second channel generates air flow to dissipate heat from the motor and the circuit board.

[0013] Preferably, external teeth are provided on the outer fixing ring, and the output end of the motor is directly or indirectly drivingly connected to the external teeth.

[0014] Preferably, an internal gear ring is provided on the outer fixing ring, and the planetary gear set includes a planet gear meshing with the internal gear ring and a sun gear meshing with the planet gear.

[0015] Preferably, a shaft support rod is provided on the planet gear, a circular planetary carrier with ventilation holes is provided on the shaft support rod, an adjusting tooth is provided on the outer side wall of the planetary carrier, and a locking structure for locking the adjusting tooth is provided on the housing.

[0016] Preferably, the locking structure includes a locking gear provided on the housing and an angle sensor provided at the locking gear. The locking gear meshes with the adjusting tooth, and an extending hole is provided on the housing. A part of the locking gear extends out of the extending hole, and a toggle block is slidably arranged on the housing at the extending hole. The inner wall of the toggle block is arc-shaped, and a plurality of locking tooth grooves for the teeth of the locking gear to extend into and lock the locking gear are provided on the inner wall.

[0017] Preferably, there are at least two outer blades, and each outer blade is evenly arranged in an array around the output shaft; there are at least two inner blades, and each inner blade is evenly arranged in an array around the output shaft.

[0018] Preferably, the outer blade is a flat plate-shaped fan blade, the inner blade is an airfoil-shaped fan blade, and the inner blade forms an angle of 30-45° with the radial section of the output shaft.

[0019] Preferably, a dust collection part is provided on the protective cover. A slot with a chip inlet hole is provided at the dust collection part. Through holes are provided on the side wall of the slot. A dust collection box is inserted into the slot, and after the dust collection box is inserted, the suction port on it is opposite to the through hole. A filter cover for blocking dust is provided at the suction port of the integrated box.

[0020] Preferably, the protective cover includes a left cover body and a right cover body that are detachably connected. After the left cover body and the right cover body are connected, they form an inverted U-shaped cross-section structure that covers the upper side of the saw blade within the opening. There are several spaced baffles on the inner wall of the tail side of one of the left cover body and the right cover body. After the dust collection box is installed, it abuts against the tail side of the baffle, and the baffle gap is opposite to the feed hole of the dust collection box.

[0021] Preferably, a holding part is provided on the housing. A control switch is provided at the holding part. Both the control switch and the power supply are connected to the circuit board through a power cord passing through the inner sealing plate, and a wire passing through sealing ring is provided on the inner sealing plate for sealing the wire passing position. A power supply installation groove is provided at the tail side of the holding part, and a battery pack is detachably inserted therein; a support frame with adjustable angles is also provided on the housing. An extension hole is provided on the support frame, and the saw blade extends out from the extension hole; a first seat body is rotatably provided on the housing, and a second seat body is rotatably provided on the first seat body. The first seat body rotates in the XZ plane, the second seat body rotates in the YZ plane, and the support frame is provided on the second seat body.

[0022] Compared with the prior art, the advantages of the present invention are as follows: In this application, a dust suction and heat dissipation mechanism is provided to generate suction in the housing, and then the dust collection box is connected through a pipeline to suck the waste chips and dust generated by cutting into the dust collection box. The generated suction is used to dissipate heat from the motor and the circuit board in the first channel and then discharged from the heat dissipation holes. At the same time, after being locked, the outer blades rotate around the outer fixed ring to generate an air flow in the second channel. The direction of this air flow is related to the deflection angle of the outer blades. No matter what its direction is, it can dissipate heat from the motor and the circuit board. Double heat dissipation can ensure that the motor works at the optimal temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further described in detail below in conjunction with the drawings and preferred embodiments. However, those skilled in the art will understand that these drawings are only drawn for the purpose of explaining the preferred embodiments and should not be used as a limitation to the scope of the present invention. In addition, unless otherwise specified, the drawings only schematically show the composition or structure of the described object and may include exaggerated displays, and the drawings are not necessarily drawn to scale.

[0024] Figure 1 is a side view of the present application;

[0025] Figure 2 is a perspective view of the present application;

[0026] Figure 3 is an exploded view of the present application;

[0027] Figure 4 is a cross-sectional view of the present application;

[0028] Figures 5-8 is an exploded view of the fan assembly;

[0029] Figure 9Isometric view of the fan assembly (removing the outer fixing ring);

[0030] Figure 10 Exploded view of the protective cover and the dust collection box;

[0031] In the figure: 10, housing; 101, holding part; 102, protective cover; 1021, dust collection part; 1022, slot; 1023, chip inlet hole; 103, cylindrical body; 1031, outer sealing plate; 10311, heat dissipation hole; 1032, inner sealing plate; 104, mounting table; 201, dust collection box; 2011, feed hole; 202, pipeline; 30, support frame; 40, battery pack; 50, saw blade; 601, motor; 602, fan assembly; 6021, inner fixing ring; 6022, inner blade; 6023, outer fixing ring; 60231, outer teeth; 60232, inner gear ring; 6024, outer blade; 6025, rotating shaft; 6026, bevel gear; 6027, spur gear; 603, output shaft; 70, planetary gear set; 701, sun gear; 7011, axle; 702, planet gear; 7021, shaft support rod; 7022, planet carrier; 70221, adjusting teeth; 70222, ventilation hole; 80, locking structure; 801, locking gear; 802, toggle block. Detailed implementation manners

[0032] The preferred embodiments of the present invention will be described in detail below with reference to the accompanying drawings. Those skilled in the art will appreciate that these descriptions are only descriptive and exemplary, and should not be construed as limiting the scope of protection of the present invention.

[0033] Embodiment

[0034] Main scheme :

[0035] An electric circular saw with dust collection and heat dissipation functions, as Figures 1-10 shown, which includes:

[0036] A motor 601;

[0037] A circuit board, which is connected to the motor 601 and a power supply for controlling the operation of the motor 601;

[0038] An output shaft 603, which is driven by the motor 601;

[0039] A saw blade 50, which is detachably arranged on the output shaft 603;

[0040] The housing 10 has a hollow cylindrical body 103 on one side for installing the motor 601 and the circuit board. The outer end of the cylindrical body 103 is provided with an outer sealing plate 1031 with heat dissipation holes 10311, and the inner end of the cylindrical body 103 is provided with a sealed inner sealing plate 1032. The output shaft 603 penetrates through the inner sealing plate 1032 and is rotationally and sealingly connected to the inner sealing plate 1032. An annular mounting table 104 is provided on its inner side wall, and a multi-purpose hole is provided on the side wall of the housing 10 outside the mounting table 104; The protective cover 102 is arranged on the housing 10, and a dust collection box 201 with an inner cavity is provided on one side. The inner cavity wall of the dust collection box 201 is provided with a feed hole 2011 extending to the outside of the cutting blade, and the inner cavity wall of the dust collection box 201 is also provided with a suction port. The suction port is communicated with the inside of the housing 10 through a pipeline 202;

[0041] Vacuum dust collection and heat dissipation mechanism, which includes a fan assembly 602 arranged on the output shaft 603. The fan assembly 602 includes an inner fixing ring 6021 fixedly connected to the output shaft 603, inner blades 6022 arranged on the inner fixing ring 6021, an outer fixing ring 6023 fixed to the outer end of the inner blades 6022 and driven by a motor 601, outer blades 6024 rotatably arranged on the outer fixing ring 6023 through a rotating shaft 6025, and a planetary gear set 70 arranged inside the outer fixing ring 6023 and in transmission connection with the outer fixing ring 6023. A bevel gear 6027 is arranged on the axle 7011 of the sun gear 701 in the planetary gear set 70, and a bevel gear 6026 is arranged at the inner end of the rotating shaft 6025. The bevel gear 6026 meshes with the bevel gear 6027 so that the outer blades 6024 rotate around their own axes while revolving. Among them, the inner blades 6022 and the outer blades 6024 are arranged in a staggered manner in the axial direction of the output shaft 603. The outer fixing ring 6023 is rotatably arranged on the mounting table 104 through a sealed bearing, so that a first channel and a second channel are respectively formed inside and outside the outer fixing ring 6023. The first channel is used to generate suction to suck the waste chips generated by cutting and dissipate heat from the motor 601 and the circuit board, and the second channel generates air flow to dissipate heat from the motor 601 and the circuit board. In this solution, by setting the vacuum dust collection and heat dissipation mechanism, suction is generated inside the housing 10, and then the dust collection box 201 is connected through a pipeline 202 to suck the waste chips and dust generated by cutting into the dust collection box 201. The generated suction dissipates heat from the motor 601 and the circuit board in the first channel and then discharges from the heat dissipation hole 10311. At the same time, after being locked, the outer blades 6024 revolve with the outer fixing ring 6023 to generate air flow in the second channel. The direction of this air flow is related to the deflection angle of the outer blades 6024. No matter what its direction is, it can dissipate heat from the motor 601 and the circuit board. Double heat dissipation can ensure that the motor 601 works at the optimal temperature; during operation, it includes the following two states. The first state is that when the sun gear 701 is not locked, the outer blades 6024 will be adjusted to a state perpendicular to the axis of the outer fixing ring 6023. At this time, the outer blades 6024 do not rotate around their own axes or swing slightly. At this time, the motor 601 is in a low-load operation state. When auxiliary heat dissipation is required in the second channel, after adjusting the angle of the planet carrier 7022 and locking it, the outer blades 6024 revolve and rotate around their own axes at this time, and the angle of the outer blades 6024 can be roughly adjusted by adjusting the rotation angle of the planet carrier 7022. Changing the angle of the outer blades 6024 can change the direction and magnitude of the wind force, so as to match different heat dissipation requirements.

[0042] Preferably, the outer fixing ring 6023 is provided with an external tooth 60231, and the output end of the motor 601 is directly or indirectly in transmission connection with the external tooth 60231.

[0043] Preferably, the outer fixing ring 6023 is provided with an internal gear ring 60232. The planetary gear set 70 includes a planetary gear 702 meshing with the internal gear ring 60232 and a sun gear 701 meshing with the planetary gear 702.

[0044] Preferably, a shaft support rod 7021 is provided on the planetary gear 702. A circular planetary carrier 7022 with ventilation holes 70222 is provided on the shaft support rod 7021. An adjustment tooth 70221 is provided on the outer side wall of the planetary carrier 7022. A locking structure 80 for locking the adjustment tooth 70221 is provided at the housing 10.

[0045] Preferably, the locking structure 80 includes a locking gear 801 provided on the housing 10 and an angle sensor provided at the locking gear 801. The locking gear 801 meshes with the adjustment tooth 70221 and an extension hole is provided on the housing 10. A part of the locking gear 801 extends out through the extension hole and a toggle block 802 is slidably provided on the housing 10 at the extension hole. The inner wall of the toggle block 802 is arc-shaped and a number of locking tooth grooves for the teeth of the locking gear 801 to extend into to lock the locking gear 801 are provided on the inner wall. In this solution, the locking gear 801 is locked by setting the locking gear 801 and sliding the sliding toggle block 802 after exposing a part of it. In addition, the locking gear 801 can be accurately toggled by setting the angle sensor. Since when in the unlocked state, the outer fan blade will automatically adjust its angle after being subjected to resistance and will finally be adjusted to a direction parallel to the rotation direction of the outer fixing ring 6023, therefore, each time of adjustment, the approximate angles of the adjustment of the planetary carrier 7022 and the outer blade 6024 are judged by the angle sensor based on this posture.

[0046] Vane part :

[0047] As Figure 8 shown, the outer blade 6024 includes at least two pieces, and the outer blades 6024 are evenly arranged in an array around the output shaft 603; the inner blade 6022 includes at least two pieces, and the inner blades 6022 are evenly arranged in an array around the output shaft 603.

[0048] Preferably, the outer blade 6024 is a flat plate-shaped fan blade, and the inner blade 6022 is an airfoil-shaped fan blade. The flat plate-shaped fan blade can reduce the resistance of its self-rotation, while the airfoil-shaped fan blade can provide stronger air flow. The blade shape can also be replaced according to requirements; the inner blade 6022 forms an angle of 30-45° with the radial section of the output shaft 603.

[0049] Protective cover part :

[0050] As Figure 10As shown in the figure, a dust collection part 1021 is provided on the protective cover 102. A slot 1022 with a chip inlet hole 1023 is provided at the dust collection part 1021. Through holes are provided on the side wall of the slot 1022. The dust collection box 201 is inserted into the slot 1022, and after the dust collection box 201 is inserted, the suction port on it is opposite to the through hole. A filter cover for blocking dust is provided at the suction port of the integrated box. A sealing ring is provided between the dust collection box 201 and the slot 1022. After the dust collection box 201 is inserted, its tail end forms a seal with the slot 1022, and only the chip inlet hole 1023 can admit air. Preferably, an upper cavity and a lower cavity separated by a partition are provided on the dust collection box 201. A dust collection liquid is provided in the lower cavity, an air inlet pipe leading into the dust collection liquid is provided in the upper cavity, and an air outlet pipe is provided in the lower cavity. The inner end of the air outlet pipe is located above the liquid level of the dust collection liquid, and the outer end of the air outlet pipe is connected to the suction port, so that large-particle waste chips are collected in the upper cavity, and small-particle dust is sucked into the dust collection liquid for absorption.

[0051] As Figure 10 shown, the protective cover 102 includes a left cover body and a right cover body that are detachably connected. After the left cover body and the right cover body are connected, they form an inverted U-shaped cross-section structure to cover the upper side of the saw blade 50 in the opening. A plurality of spaced baffles are provided on the inner wall of the tail side of one of the left cover body and the right cover body. After the dust collection box 201 is installed, it abuts against the tail side of the baffle, and the baffle gap is opposite to the feed hole of the dust collection box 201.

[0052] In addition, a rotatable and slidable inner cover is further provided in the opening of the protective cover 102. When the inner cover rotates inward to the maximum extent, the chip inlet is not blocked.

[0053] Housing part :

[0054] As Figures 1-3 shown, a holding part 101 is provided on the housing 10. A control switch is provided at the holding part 101. Both the control switch and the power supply are connected to the circuit board through a power cord passing through the inner sealing plate 1032, and a wire passing sealing ring is provided on the inner sealing plate 1032 for sealing the wire passing position. A power supply installation slot is provided at the tail side of the holding part 101, and a battery pack 40 is detachably inserted.

[0055] Bracket part :

[0056] As Figures 1-3 shown, a multi-adjustable angle support frame 30 is further provided on the housing 10. An extension hole is provided on the support frame 30, and the saw blade 50 extends out from the extension hole.

[0057] Preferably, a first seat body is rotatably provided on the housing 10, a second seat body is rotatably provided on the first seat body. The first seat body rotates in the XZ plane, the second seat body rotates in the YZ plane, and the support frame 30 is provided on the second seat body. The first seat body and the second seat body are not shown in the figure.

[0058] The above has introduced the electric circular saw with dust suction and heat dissipation functions provided by the present invention. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the present invention and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. An electric circular saw with dust absorption and heat dissipation function, characterized in that: include: Motor; A circuit board connected to the motor and a power source for controlling the operation of the motor; an output shaft, which is driven by the motor; A saw blade, which is detachably mounted on the output shaft; The housing has a hollow cylindrical body for mounting the motor and the circuit board on one side, an outer sealing plate with heat dissipation holes is provided at the outer end of the cylindrical body, and a sealed inner sealing plate is provided at the inner end of the cylindrical body. The output shaft passes through the inner sealing plate and is rotatably sealed with the inner sealing plate. An annular mounting platform is provided on the inner wall of the housing, and a multi-purpose hole is provided on the side wall of the housing outside the mounting platform; A protective cover is arranged on the shell, and a dust collecting box with an inner cavity is arranged on one side of the protective cover. The inner cavity wall of the dust collecting box is provided with a feeding hole extending to the outside of the cutting blade. The inner cavity wall of the dust collecting box is also provided with an air suction port, which is connected with the inside of the shell through a pipeline. The dust suction and heat dissipation mechanism includes a fan assembly in a shell, the fan assembly includes an inner fixed ring fixedly connected to the output shaft, inner blades arranged on the inner fixed ring, an outer fixed ring fixed to the outer end of the inner blade and driven by a motor, outer blades arranged on the outer fixed ring are rotated by a rotating shaft, and a planetary gear set is arranged in the outer fixed ring and is transmission-connected to the outer fixed ring. A bevel gear is provided on the axle of the sun gear in the planetary gear set, and a bevel gear is provided at the inner end of the rotating shaft. The bevel gear is meshed with the bevel gear so that the outer blades rotate while revolving. The inner blades and the outer blades are staggered in the axial direction of the output shaft. The outer fixed ring is rotatably arranged on the mounting table through a sealed bearing so that a first channel and a second channel are formed inside and outside the outer fixed ring respectively. The first channel is used to generate suction to absorb waste chips generated by cutting and dissipate heat to the motor and the circuit board, and the second channel generates airflow to dissipate heat to the motor and the circuit board.

2. The electric circular saw with dust absorption and heat dissipation function according to claim 1, characterized in that: The outer fixing ring is provided with external teeth, and the output end of the motor is directly or indirectly connected with the external teeth.

3. The electric circular saw with dust absorption and heat dissipation function according to claim 2, characterized in that: An inner gear ring is arranged on the outer fixed ring, and the planetary gear set comprises a planetary gear meshed with the inner gear ring and a sun gear meshed with the planetary gear.

4. The electric circular saw with dust absorption and heat dissipation function according to claim 3, characterized in that: A shaft support rod is arranged on the planet wheel, a circular ring planet frame with ventilation holes is arranged on the shaft support rod, a circle of adjusting teeth is arranged on the outer side wall of the planet frame, and a locking structure for locking the adjusting teeth is arranged at the shell body.

5. The electric circular saw with dust absorption and heat dissipation function according to claim 4, characterized in that: The locking structure includes a locking gear arranged on the shell and an angle sensor arranged at the locking gear. The locking gear is meshed with the adjusting tooth and an extension hole is provided on the shell. The locking gear portion extends out of the extension hole and a toggle block is slidably provided on the shell at the extension hole. The inner wall of the toggle block is arc-shaped and a plurality of locking tooth grooves are provided on its inner wall for the teeth of the locking gear to extend into and lock the locking gear.

6. The electric circular saw with dust absorption and heat dissipation function according to claim 1, characterized in that: The outer blades include at least two, and each outer blade array is evenly distributed on the periphery of the output shaft; the inner blades include at least two, and each inner blade array is evenly distributed on the periphery of the output shaft.

7. The electric circular saw with dust absorption and heat dissipation function according to claim 2, characterized in that: The outer blades are flat plate-shaped blades, the inner blades are airfoil-shaped blades, and the inner blades form an angle of 30-45° with the radial section of the output shaft.

8. The electric circular saw with dust absorption and heat dissipation function according to claim 1, characterized in that: A dust collecting part is provided on the protective cover, a slot with a chip feeding hole is provided at the dust collecting part, a through hole is provided on the side wall of the slot, a dust collecting box is inserted in the slot and after the dust collecting box is inserted, the air suction port on the dust collecting box is opposite to the through hole, and a filter cover for blocking dust is provided at the air suction port of the integrated box.

9. The electric circular saw with dust absorption and heat dissipation function according to claim 1, characterized in that: The protective cover includes a left cover body and a right cover body that are detachably connected. When the left cover body and the right cover body are connected, a structure with an inverted U-shaped cross-section is formed to cover the upper side of the saw blade in the opening. A plurality of spaced baffles are provided on the inner wall on the rear side of one of the left cover body and the right cover body. After the dust box is installed, it rests against the rear side of the baffle and the gap between the baffles is opposite to the feeding hole of the dust box.

10. The electric circular saw with dust absorption and heat dissipation function according to claim 1, characterized in that: A gripping portion is provided on the shell, and a control switch is provided on the gripping portion. The control switch and the power supply are connected to the circuit board through a power cord passing through an inner sealing plate, and a wire passing sealing ring is provided on the inner sealing plate for sealing the threading position. A power supply mounting slot is provided on the rear side of the gripping portion and a battery pack is detachably inserted therein; a support frame with multiple adjustable angles is also provided on the shell, and an extension hole is provided on the support frame, and a saw blade extends from the extension hole; a first seat body is rotatably provided on the shell, and a second seat body is rotatably provided on the first seat body, the first seat body rotates in an XZ plane, and the second seat body rotates in a YZ plane, and the support frame is provided on the second seat body.

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