Cutting machine

Abstract

The invention discloses a cutting machine. The cutting machine comprises: a housing; the motor is provided with a motor shaft; the output shaft is used for mounting and driving the saw blade; the transmission assembly transmits power between the motor shaft and the output shaft; the circuit board assembly comprises a circuit board and a heat dissipation piece, and the circuit board is connected with the heat dissipation piece; the casing has an opening, and at least part of the heat dissipation member is exposed relative to the casing through the opening. According to the scheme, the heat dissipation problem of the circuit board in the cutting machine can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric tools, for example, to a cutting machine. Background Art

[0002] A cutting machine in the related art (also known as a cutting saw, a cutting saw, etc., A handheld saw, used for cutting concrete and other materials, typically uses an air-cooled heat dissipation solution. A motor drives a fan, allowing airflow from the outside of the casing to flow through heat-generating components such as circuit boards and motors, and then out of the casing. Under heavy loads, existing air-cooling solutions cannot meet these heat dissipation requirements.

[0003] This section provides background information related to the present application which is not necessarily prior art. Summary of the Invention

[0004] One object of the present application is to solve or at least alleviate a part or all of the above problems. To this end, the present application provides a cutting machine.

[0005] A cutting machine includes: a casing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; a circuit board assembly including a circuit board and a heat sink, wherein the circuit board is connected to the heat sink; a heat conductor connected to the casing, wherein the heat conductor is at least partially located outside the casing; the casing has an opening, wherein the heat sink is at least partially exposed relative to the casing through the opening and is in thermal contact with the heat conductor.

[0006] In some embodiments, the heat sink is a heat dissipation box, and a side of the heat dissipation box away from the circuit board has a plurality of heat dissipation holes, and the heat dissipation holes penetrate the box body of the heat dissipation box in a direction substantially parallel to the plane where the circuit board is located.

[0007] In some embodiments, the opening is located at the front bottom surface of the housing, the heat conducting element is connected to the housing around the opening and has a heat conducting plane covering the opening, and the heat dissipating element is attached to the heat conducting element through the heat conducting plane.

[0008] In some embodiments, the cutting machine further comprises a liquid cooling system, which sprays cooling liquid onto the saw blade when the saw blade is cutting, and the cooling liquid moves through the heat conducting member after leaving the saw blade.

[0009] In some embodiments, the liquid cooling system includes a transmission pipe for transmitting cooling liquid. A slot for the transmission pipe to pass through is formed in the housing, and an extension path of the transmission pipe passes through the housing around the circuit board assembly.

[0010] In some embodiments, the projections of the transmission tube and the circuit board in the vertical direction at least partially overlap; and / or the projections of the transmission tube and the heat sink in the vertical direction at least partially overlap.

[0011] In some embodiments, the cutting machine further includes a sealing member, which is disposed around the opening and fills gaps between the housing, the heat dissipation member, and the heat conduction member.

[0012] In some embodiments, the cutting machine also includes a fan, which is installed on the motor shaft. The casing has an air inlet and an air outlet. The heat dissipation airflow enters the casing from the air inlet, flows through the circuit board assembly and the motor in sequence, and is blown out from the air outlet.

[0013] In some embodiments, the air inlet is located at the left wall and / or right wall of the middle and rear portion of the housing, and the air outlet is located at the front portion of the housing.

[0014] In some embodiments, the heat conductive member is a wear-resistant metal member.

[0015] A cutting machine includes: a casing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; the cutting machine also includes: a circuit board assembly including a circuit board and a heat sink, wherein the circuit board is connected to the heat sink; the casing has an opening, and the heat sink is at least partially exposed relative to the casing through the opening.

[0016] In some embodiments, the housing includes a main body extending in a front-to-rear direction, the main body having a support surface for supporting the cutting machine when the cutting machine is placed horizontally, the motor shaft extends along the motor axis, and the motor axis obliquely intersects the support surface.

[0017] In some embodiments, the output shaft is located outside the housing, and the output shaft is substantially parallel to the support surface and extends along the left-right direction of the housing.

[0018] In some embodiments, the cutting machine further comprises a second housing connected to the housing and located outside the housing, and the transmission assembly is at least partially located inside the second housing; the central axis of the second housing intersects obliquely with the support surface.

[0019] In some embodiments, the transmission assembly includes a long shaft and a bevel gear set, the long shaft is connected to the motor shaft and is colinear, and the bevel gear set is connected between the long shaft and the output shaft to transmit power.

[0020] In some embodiments, the cutting machine also includes a shaft lock assembly arranged on the second housing, the shaft lock assembly includes an operating member and a shaft lock member connected to each other; a shaft lock groove is circumferentially arranged on the long axis for the shaft lock member to be embedded, and the shaft lock groove extends in a direction basically parallel to the long axis; the operating member is operated by the user to push the operating member and the shaft lock member in a direction basically parallel to the long axis, so that the shaft lock member is embedded in the shaft lock groove to lock the rotation of the output shaft.

[0021] In some embodiments, the cutting machine also includes a heat conductor, and the heat conductor, the heat sink and the second housing are connected; the heat sink, the heat conductor, the second housing and the saw blade are all made of conductive materials, and the static electricity generated during the cutting process is transferred to the saw blade through the heat sink, the heat conductor and the second housing and then released to the ground.

[0022] In some embodiments, the cutting machine also includes a shield and a shield adjustment mechanism. The shield is connected to the second housing through the shield adjustment mechanism. The shield adjustment mechanism includes an adjusting bolt and an adjusting handle. A rotating track is provided on the side of the shield close to the second housing. One end of the adjusting bolt is fixedly connected to the second housing, and the other end is rotatably connected to the shield through the rotating track. The adjusting handle releases or locks the relative rotation of the adjusting bolt and the shield, thereby locking or releasing the relative rotation of the second housing and the shield.

[0023] In some embodiments, the shield adjustment mechanism performs stepless adjustment on the rotation angle of the shield around the output shaft, and the rotatable angle of the shield around the output shaft is between 0° and 45°.

[0024] In some embodiments, the circuit board is located below the motor, and projections of the circuit board and the motor in the vertical direction at least partially overlap.

[0025] A cutting machine includes: a casing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; the cutting machine also includes: a circuit board assembly, including a circuit board and a heat dissipation box, the circuit board being connected to the heat dissipation box; the heat dissipation box having a plurality of heat dissipation holes on a side away from the circuit board, the heat dissipation holes penetrating the box body of the heat dissipation box in a direction substantially parallel to the plane where the circuit board is located; an air guide plate connected to the casing, the air guide plate being located inside the casing; the casing having an air inlet, the casing, the air guide plate and the heat dissipation box forming a first air flow channel between the air inlet and the heat dissipation holes, the heat dissipation airflow entering the casing from the air inlet passes through the first air flow channel and the heat dissipation holes in sequence.

[0026] In some embodiments, the casing has an air outlet, the motor has a motor casing, and the casing and the motor casing form a second air flow channel between the motor and the air outlet. The heat dissipation airflow flows through the motor in the motor casing and is blown out of the air outlet through the second air flow channel.

[0027] In some embodiments, the first air flow channel is substantially sealed between the air inlet and the heat dissipation hole, and / or the second air flow channel is substantially sealed between the motor and the air outlet.

[0028] In some embodiments, the heat dissipation box is located below the motor, and the projections of the heat dissipation box and the motor in the vertical direction at least partially overlap. The heat dissipation airflow passes through the heat dissipation holes and then enters the motor housing through the inner cavity of the housing.

[0029] In some embodiments, the cutting machine also includes a guard and a liquid cooling system, the saw blade is partially accommodated in the guard, and the liquid cooling system sprays coolant to the saw blade when the saw blade is cutting; the liquid cooling system includes a nozzle, which penetrates the guard to output the coolant.

[0030] In some embodiments, the liquid cooling system includes a left nozzle and a right nozzle, the left nozzle is disposed on the left end surface of the shield, and the right nozzle is disposed on the right end surface of the shield.

[0031] In some embodiments, the liquid cooling system further includes a liquid inlet valve and a transmission pipe, the transmission pipe is used to transmit the cooling liquid, and the liquid inlet valve adjusts the flow rate of the cooling liquid in the transmission pipe.

[0032] In some embodiments, the left nozzle and / or the right nozzle includes a first piece and a second piece, the first piece is connected to the shield and has a through hole passing through the shield, and the second piece is detachably connected to the first piece; when the second piece is installed to the first piece, the end of the through hole away from the shield is closed by the second piece; when the second piece is removed from the first piece, the end of the through hole away from the shield is open.

[0033] In some embodiments, the cutting machine also includes a second housing, the second housing is located outside the housing, and the transmission assembly is at least partially accommodated in the second housing; the liquid cooling system also includes a transmission pipe for transmitting coolant, the transmission pipe extends from the front end of the housing between the second housing and the shield, spans above the shield and is connected to the left nozzle and the right nozzle.

[0034] In some embodiments, a shield handle is provided on the upper portion of the shield for the user to operate to rotate the shield, and the transmission tube is limited by the shield handle when it passes over the shield.

[0035] In some embodiments, the cutting machine further includes a support guide having a support portion located between the second housing and the shield, and the transmission tube passes through the support portion and is limited by the support portion.

[0036] A cutting machine includes: a casing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; the cutting machine also includes: a battery pack for supplying power to at least the motor; the casing includes a main body and a battery compartment cover, a battery compartment is formed inside the main body, and the battery compartment cover has a closed state and an open state; in the closed state, the battery compartment cover seals the battery compartment; in the open state, the battery pack is detachably plugged into and out of the battery compartment in the left and right directions.

[0037] In some embodiments, the battery compartment cover is rotatably connected to the main body, and the battery compartment cover can rotate around a flip axis, and the flip axis is perpendicular to the bottom surface of the housing.

[0038] In some embodiments, the battery compartment cover can freely rotate around the flip axis between 0 and 180 degrees compared to the closed state when in the open state.

[0039] In some embodiments, when the battery compartment cover is in the open state, it rotates to a preset angle relative to the closed state about the flip axis and remains at the preset angle, and the preset angle is greater than or equal to 90° and less than or equal to 180°.

[0040] In some embodiments, one of the main body and the battery compartment cover is provided with a second clip, and the other is provided with a second slot, and the second clip cooperates with the second slot to achieve sealing of the battery compartment; the battery compartment cover is rotatably connected to the main body through a connecting shaft, and the connecting shaft extends along the flip axis, and the connecting shaft is connected to the elastic member. When the second clip is disengaged from the second slot, the elastic member causes the battery compartment cover to rotate to a preset angle with the flip axis as the axis in a relatively closed state and maintain it at the preset angle.

[0041] In some embodiments, one of the battery pack and the battery compartment is provided with a first clip, and the other is provided with a first slot, and the first clip cooperates with the first slot to achieve locking of the battery pack and the battery compartment; the cutting machine also includes: a battery pack pop-up mechanism, which is provided on the inner wall of the battery compartment, and when the first clip is disengaged from the first slot, the battery pack pop-up mechanism will eject the battery pack at least partially out of the battery compartment along the plug-in and pull-out direction.

[0042] In some embodiments, circuit wiring and terminal blocks are provided on the inner wall of the battery compartment; the cutting machine also includes: a circuit cover plate, which is provided in the battery compartment, and the circuit cover plate cooperates with the inner wall of the battery compartment to limit the circuit wiring.

[0043] In some embodiments, the terminal seat is arranged on the upper inner wall of the battery compartment; the circuit wiring and the circuit cover are arranged on the left inner wall or the right inner wall of the battery compartment away from the battery compartment cover.

[0044] A cutting machine includes: a casing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; a battery pack for supplying power to at least the motor, wherein the outer shell of the battery pack is provided with a prompt member for displaying status information of the battery pack; a battery compartment is formed inside the casing, and the battery pack is detachably plugged into the battery compartment; the casing has a transparent portion, the transparent portion corresponds to the position of the prompt member, and the status information displayed by the prompt member can be observed through the transparent portion.

[0045] In some embodiments, the reminder at least displays the remaining power information of the battery pack.

[0046] In some embodiments, the reminder is a remaining power indicator light of the battery pack.

[0047] In some embodiments, the housing includes a main body, a grip portion, and a battery compartment cover, the grip portion is at least partially located behind the main body, and the battery compartment cover seals the battery compartment; the transparent portion is located on the upper rear side of the main body and in front of the grip portion; and / or the transparent portion is located on the battery compartment cover.

[0048] In some embodiments, a first operating member is provided on the housing, and the first operating member is operated by a user to make the prompt member display status information.

[0049] In some embodiments, the housing of the battery pack further has a second operating member for the user to operate to cause the prompt member to display status information, and the second operating member is connected to the first operating member.

[0050] In some embodiments, a battery reminder is provided on the housing, and the battery reminder is electrically connected to the circuit board to obtain and display status information of the battery pack.

[0051] In some embodiments, the battery reminder includes an operating part, a prompt part and a sub-circuit board. The sub-circuit board is electrically connected to the operating part, the prompt part and the circuit board. The sub-circuit board responds to the signal sent by the user when the operating part is operated, obtains the status information of the battery pack from the circuit board, and triggers the prompt part to display the corresponding information.

[0052] In some embodiments, the operating portion and the prompt portion are embedded in the surface of the housing, and the sub-circuit board is arranged on the back of the operating portion and the prompt portion and is located inside the housing.

[0053] In some embodiments, the sub-circuit board is electrically connected to the circuit board via a flat cable, and the flat cable is attached to the inner wall of the housing.

[0054] In some embodiments, the status information of the battery pack includes remaining power information and / or fault warning information of the battery pack.

[0055] In some embodiments, the prompt portion includes a remaining power indicator light or a display screen.

[0056] A cutting machine includes: a housing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; a battery pack for supplying power to at least the motor; and a battery reminder provided on the housing, the battery reminder being electrically connected to a circuit board to obtain and display status information of the battery pack.

[0057] A cutting machine comprises: a housing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; a second housing located outside the housing and accommodating at least part of the transmission assembly; a through hole for airflow and / or lubricant circulation is provided on the second housing, and the cutting machine further comprises an expansion hood, which covers the through hole and is sealingly connected to the second housing to form a volume-variable sealed space between the expansion hood and the second housing that is open only toward the through hole.

[0058] In some embodiments, the expansion cover is made of a soft adhesive material, which includes rubber or silicone.

[0059] In some embodiments, the second housing includes a second housing body and a first end cover, the first end cover is sealed to the second housing body to form a first accommodating space for at least accommodating the transmission assembly, a through hole is opened on the first end cover, and the expansion cover is installed to the first end cover.

[0060] In some embodiments, the second housing further includes a second end cover, the second end cover is mounted to the first end cover, and the expansion cover is sandwiched between the first end cover and the second end cover.

[0061] In some embodiments, a second accommodating space for accommodating at least the bearing assembly is formed between the second end cover and the first end cover.

[0062] In some embodiments, the first end cover and the second end cover have docking portions facing each other, and the expansion cover is clamped and fixed between the docking portions.

[0063] In some embodiments, the docking portion separates the bearing assembly space in the second accommodating space from the space where the expansion cover is located.

[0064] In some embodiments, an opening connected to the outside is provided on the second end cover, and the expansion cover divides the second accommodation space between the second end cover and the first end cover into at least a sealed space connected to the first accommodation space through the through hole on the first end cover and an open space connected to the outside through the opening on the second end cover.

[0065] In some embodiments, when the temperature and / or pressure in the first accommodation space between the first end cover where the transmission assembly is located and the second housing body increases, the gas and / or lubricant in the first accommodation space enters between the expansion cover and the first end cover through the through hole.

[0066] In some embodiments, one end of the output shaft is connected to the transmission assembly in the first accommodation space, and the other end of the output shaft passes through the first end cover and the second end cover to be installed in the shield and drive the saw blade.

[0067] A cutting machine includes: a casing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; the cutting machine also includes a hook assembly, through which the cutting machine is stably suspended on a fulcrum in a substantially vertical posture.

[0068] In some embodiments, the hook assembly is disposed on the bottom surface of the housing.

[0069] In some embodiments, the hook assembly is disposed on a portion of the bottom surface of the housing that is higher in the vertical direction.

[0070] In some embodiments, the housing includes a main body extending in a front-to-back direction, a battery compartment is formed inside the main body, and the hook assembly is arranged on the bottom surface of the housing below the battery compartment.

[0071] In some embodiments, the housing includes a main handle located at the rear of the cutting machine, and the hook assembly is disposed on the bottom surface or rear end of the main handle.

[0072] In some embodiments, the hook assembly has a storage state and a hanging state. The hook assembly is rotatably connected to the housing, and the hook assembly rotates relative to the housing to switch between the storage state and the hanging state.

[0073] In some embodiments, the hook assembly includes a hook body and a mounting member, the mounting member is fixedly connected to the housing, and the hook body is rotatably connected to the mounting member.

[0074] In some embodiments, the hook body is rotated at least 90° relative to the mounting member in the hanging state compared to the storage state.

[0075] In some embodiments, the bottom surface of the casing of the cutting machine in the suspended state is basically perpendicular to the ground, and the surface where the hook body is located is basically parallel to the bottom surface of the casing, wherein the bottom surface of the casing is basically parallel to the ground when the cutting machine is placed horizontally.

[0076] In some embodiments, in the hanging state, the surface of the hook body is substantially perpendicular to the bottom surface of the housing.

[0077] A cutting machine comprises: a casing; a motor having a motor shaft; an output shaft for mounting and driving a saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; the cutting machine also comprises: a shaft lock assembly having a locked state for locking the rotation of the output shaft and an unlocked state for releasing the rotation of the output shaft, and comprising a shaft lock member, an elastic member and a support limit member; the transmission assembly has a shaft lock groove for the shaft lock member to be embedded in to block the power transmission to the output shaft, the elastic member abuts against the shaft lock member and is configured to always give the shaft lock member a movement tendency to embed into the shaft lock groove by relying on its own elastic deformation; the shaft lock member is configured to rotate up or down relative to the support limit member under the constraint of the support limit member to enable the shaft lock assembly to switch between the locked state and the unlocked state.

[0078] In some embodiments, the shaft lock assembly further includes: an operating member connected to or formed on the shaft lock member, having a locking position and an unlocking position that can be switched in a rotational manner.

[0079] In some embodiments, the rotation axis of the operating member is collinear or parallel to the rotation axis of the shaft locking member.

[0080] In some embodiments, the support limiter has a spiral track arranged along the circumference of the shaft locking member, and the shaft locking member is connected or formed with a matching portion, which moves along the spiral track under the constraint of the track to drive the shaft locking member to rotate up or down.

[0081] In some embodiments, the spiral track supporting the limiting member is at least partially accommodated in the operating member.

[0082] In some embodiments, locking parts are provided at both ends of the spiral track, and when the mating part reaches both ends of the spiral track, it is limited by the locking parts so that the shaft lock assembly remains in a locked state or an unlocked state.

[0083] In some embodiments, during the process of the operating member rotating and switching from one of the locked position and the unlocked position to the other, the mating part overcomes the limitation of the locking part at one end of the spiral track, and is driven by the elastic member or overcomes the drive of the elastic member to rotate up or down along the spiral track until it reaches the locking part at the other end of the spiral track and is limited by it to stop, thereby driving the shaft locking member to disengage from or embed into the shaft locking groove.

[0084] In some embodiments, the cutting machine further includes: a second housing located outside the housing and accommodating at least a portion of the transmission assembly, and the support and limiting member is fixedly mounted on the second housing.

[0085] In some embodiments, the transmission assembly includes a long shaft connected to the motor shaft, and a shaft locking groove is provided along the circumference of the long shaft.

[0086] In some embodiments, a guide surface is provided between adjacent shaft lock grooves. After the shaft lock member rotates up or down to the guide surface, it will slide relative to the shaft lock groove along the guide surface to be embedded in the shaft lock groove.

[0087] The benefit of the present application is at least that the heat sink connected to the circuit board in the cutting machine can achieve contact heat exchange with the space outside the shell through the shell opening, and can also transfer heat to the heat-conducting member outside the shell through thermal contact, thereby having an excellent heat dissipation effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0088] Figure 1 It is a three-dimensional diagram of the cutting machine provided by the present application at one viewing angle;

[0089] Figure 2 is a three-dimensional diagram of the cutting machine provided by the present application from another perspective;

[0090] Figure 3 yes Figure 2 A perspective view of the exploded structure of the heat conducting components and heat dissipating components in the cutting machine shown;

[0091] Figure 4 is an exploded view of the cutting machine provided by this application;

[0092] Figure 5 This is a three-dimensional diagram of the motor, transmission assembly, output shaft, and shaft lock assembly of the cutting machine provided by the present application;

[0093] Figure 6 yes Figure 5 A plan view of the cutting machine center shaft lock assembly shown in an unlocked state;

[0094] Figure 7 yes Figure 5 A plan view of the cutting machine shaft lock assembly shown in a locked state;

[0095] Figure 8 It is a left side view of the cutting machine provided by the present application;

[0096] Figure 9 This is a three-dimensional diagram of the cutting machine provided by the present application after removing part of the casing from one perspective;

[0097] Figure 10 This is a three-dimensional diagram of the cutting machine provided by the present application with part of the casing removed from another perspective;

[0098] Figure 11 This is a schematic diagram of the heat dissipation airflow direction in the cutting machine provided by this application Figure 1 ;

[0099] Figure 12 This is a schematic diagram of the heat dissipation airflow direction in the cutting machine provided by this application Figure 2 ;

[0100] Figure 13 yes Figure 12 A perspective view of the exploded structure of a portion of the casing, air guide plate, and heat sink of the cutting machine shown;

[0101] Figure 14 This is a schematic diagram of the heat dissipation airflow direction in the cutting machine provided by this application Figure 3 ;

[0102] Figure 15 This is a right side view of the cutting machine provided by the present application with part of the casing removed;

[0103] Figure 16 yes Figure 15 A cross-sectional view of the cutting machine shown along the AA direction;

[0104] Figure 17It is a three-dimensional diagram of the motor, the second housing, the shield, and the shield adjustment mechanism of the cutting machine provided by the present application;

[0105] Figure 18 yes Figure 17 An exploded view of the guard and guard adjustment mechanism in the cutting machine shown;

[0106] Figure 19 This is a three-dimensional diagram of the exploded structure of part of the housing, heat sink, seal, and heat conductor of the cutting machine provided by the present application;

[0107] Figure 20 is an exploded view of the left nozzle in the cutting machine provided by this application;

[0108] Figure 21 is a plan view of the shield in the cutting machine provided by the present application in a first position;

[0109] Figure 22 is a plan view of the shield in the second position of the cutting machine provided by the present application;

[0110] Figure 23 It is a three-dimensional diagram of the battery compartment, battery compartment cover, and battery pack in the cutting machine provided by the present application;

[0111] Figure 24 yes Figure 23 A perspective view of the exploded structure of the battery compartment and battery compartment cover in the cutting machine shown;

[0112] Figure 25 yes Figure 23 An exploded view of part of the structure inside the battery compartment of the cutting machine shown;

[0113] Figure 26 is a three-dimensional diagram of the cutting machine provided by the present application from another viewing angle;

[0114] Figure 27 yes Figure 26 A three-dimensional view of the battery indicator and circuit board assembly after the cutting machine has removed part of the housing;

[0115] Figure 28 yes Figure 27 A perspective view of the exploded structure of the battery reminder;

[0116] Figure 29 yes Figure 26 A three-dimensional diagram of the transmission tube and the elastic support member in the cutting machine shown;

[0117] Figure 30 yes Figure 26 A perspective view of the exploded structure of the left nozzle, the shield, and the right nozzle in the cutting machine;

[0118] Figure 31 yes Figure 26A perspective view of the exploded structure of the second housing body, the first end cover, the expansion cover, the second end cover, and the protective cover in the cutting machine shown;

[0119] Figure 32 yes Figure 26 A cross-sectional view of the shield, output shaft, bearing assembly, and second housing of the cutting machine shown;

[0120] Figure 33 yes Figure 26 A plan view of the hook assembly in the cutter shown in the stowed state;

[0121] Figure 34 yes Figure 26 A plan view of the hook assembly in the cutting machine shown in a suspended state;

[0122] Figure 35 yes Figure 26 A perspective view of the cutting machine with a portion of the housing removed and the shaft lock assembly in a locked state;

[0123] Figure 36 yes Figure 26 A perspective view of the cutting machine with a portion of the housing removed and the shaft lock assembly in an unlocked state;

[0124] Figure 37 yes Figure 35 An exploded view of the shaft lock assembly is shown;

[0125] Figure 38 yes Figure 35 A cross-sectional view of the shaft lock assembly is shown.

[0126] Figure legend:

[0127] 100. Cutting machine;

[0128] 110. Casing; 111. Main body; 1111. Battery compartment; 1112. Second buckle; 112. Main handle; 113. Front handle; 114. Air inlet; 115. Air outlet; 116. Battery compartment cover; 1161. Second slot; 117. Connecting shaft; 118. Elastic member; 119. Transparent portion; 1191. Battery indicator; 1192. Operation unit; 1193. Sub-circuit board; 1194. Indicator unit;

[0129] 120, motor; 121, motor shaft; 122, motor axis; 123, motor housing; 130, output shaft; 131, output axis; 140, transmission assembly; 141, long shaft; 1411, shaft lock groove; 1412, guide surface; 142, bevel gear set; 1421, first bevel gear; 1422, second bevel gear; 143, bearing assembly;

[0130] 150. Saw blade; 160. Second housing; 161. Second housing body; 162. First end cap; 163. Second end cap; 164. Expansion cover; 165. Through hole; 166. Docking portion; 167. Opening; 170. Shaft lock assembly; 171. Operating member; 172. Shaft lock member; 1721. Mating portion; 173. Support and stop member; 1731. Spiral track; 1732. Locking portion; 174. Elastic member;

[0131] 180, circuit board assembly; 181, circuit board; 182, heat sink; 1821, heat dissipation through hole; 183, sealing member; 190, thermal conductor;

[0132] 210, liquid cooling system; 211, transmission pipe; 2112, elastic support member; 212, left nozzle; 2121, first member; 2122, second member; 213, right nozzle; 214, liquid inlet valve;

[0133] 220, guard; 221, rotating track; 230, guard handle; 240, support guide; 241, support portion; 242, guide portion; 250, water shield; 260, fan; 270, wind deflector; 280, guard adjustment mechanism; 281, adjustment bolt; 282, adjustment handle; 283, elastic gasket;

[0134] 290. Battery pack; 291. First clip; 292. Prompt member; 293. Second operating member; 294. Third operating member; 310. Battery pack ejection mechanism; 320. Terminal block; 330. Circuit cover; 340. First operating member; 410. Hook assembly; 411. Hook body; 412. Mounting member. DETAILED DESCRIPTION

[0135] Before any embodiments of the present application are explained in detail, it is to be understood that the application is not limited in its application to the details of construction and the arrangement of components set forth in the following description or illustrated in the foregoing drawings.

[0136] In this application, the terms "comprises," "includes," "has," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or apparatus that includes a list of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or apparatus. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not preclude the presence of additional identical elements in the process, method, article, or apparatus that includes the element.

[0137] In this application, the term "and / or" describes a relationship between related objects, indicating that three possible relationships exist. For example, "A and / or B" can represent: A exists alone, A and B exist simultaneously, or B exists alone. Additionally, the character " / " in this application generally indicates that the related objects are in an "and / or" relationship.

[0138] In this application, the terms "connect," "combine," "couple," and "install" may refer to direct connection, combination, coupling, or installation, or indirect connection, combination, coupling, or installation. For example, a direct connection refers to two parts or components being connected together without an intermediary, and an indirect connection refers to two parts or components being connected to at least one intermediary, with the two parts or components being connected via the intermediary. Furthermore, "connect" and "couple" are not limited to physical or mechanical connections or couplings and may include electrical connections or couplings.

[0139] In this application, it will be understood by those skilled in the art that relative terms (e.g., "about," "approximately," "substantially," etc.) used in conjunction with quantities or conditions include the values ​​and have the meaning indicated by the context. For example, the relative terms include at least the degree of error associated with the measurement of a specific value, the tolerance caused by manufacturing, assembly, use, etc. associated with a specific value. Such terms should also be considered to disclose a range defined by the absolute values ​​of the two endpoints. Relative terms may refer to plus or minus a certain percentage (e.g., 1%, 5%, 10% or more) of the indicated value. Numerical values ​​that do not use relative terms should also be disclosed as specific values ​​with tolerances. In addition, "substantially" may refer to plus or minus a certain degree (e.g., 1 degree, 5 degrees, 10 degrees or more) on the basis of the indicated angle when expressing a relative angular position relationship (e.g., substantially parallel, substantially perpendicular).

[0140] In this application, it will be understood by those skilled in the art that the function performed by an assembly can be performed by one assembly, multiple assemblies, one part, or multiple parts. Similarly, the function performed by a part can also be performed by one part, one assembly, or a combination of multiple parts.

[0141] In the present application, the terms "upper", "lower", "left", "right", "front", "back" and other directional words are described based on the orientation and positional relationship shown in the accompanying drawings, and should not be understood as limiting the embodiments of the present application. In addition, in the context, it is also necessary to understand that when it is mentioned that an element is connected to another element "upper" or "lower", it can not only be directly connected to the other element "upper" or "lower", but also be indirectly connected to the other element "upper" or "lower" through an intermediate element. It should also be understood that directional words such as upper side, lower side, left side, right side, front side, back side, etc. not only represent the positive orientation, but can also be understood as the lateral orientation. For example, below can include directly below, lower left, lower right, lower front and lower back, etc.

[0142] In this application, the terms "controller," "processor," "central processing unit," "CPU," and "MCU" are used interchangeably. Where a unit "controller," "processor," "central processing unit," "CPU," or "MCU" is used to perform a particular function, unless otherwise specified, the function may be performed by a single unit or multiple units.

[0143] In this application, the terms "device", "module" or "unit" can be implemented in the form of hardware or software to achieve specific functions.

[0144] In this application, the terms "calculate", "judge", "control", "determine", "identify", etc. refer to the operations and processes of a computer system or similar electronic computing device (e.g., controller, processor, etc.).

[0145] See also Figures 1 to 10 The present application provides a sawing machine 100, which includes a housing 110, a motor 120, an output shaft 130, and a transmission assembly 140. The housing 110 includes a main body 111 extending in a front-to-rear direction. The motor 120 is disposed within the main body 111. The motor 120 has a motor shaft 121. The output shaft 130 is used to mount and drive a saw blade 150. The transmission assembly 140 transmits power between the motor shaft 121 and the output shaft 130.

[0146] The housing 110 also includes a grip portion, which is at least partially located behind the main body 111. The grip portion includes a main handle 112, which is located behind the main body 111 for easy gripping. In some embodiments, the main handle 112 forms a through-hole through which a hand can pass for gripping. The grip portion also includes a front handle 113, which is disposed on and above the main body 111. During use, the cutting machine 100 can be operated by holding the front handle 113 with one hand and the main handle 112 with the other hand.

[0147] In some embodiments, the housing 110 includes a left housing and a right housing, which are fastened together to form a main body 111 and a handle. In some embodiments, the main body 111 and the handle are detachably connected. The main body 111 includes the left housing and the right housing. Of course, the various components of the housing 110 can also be integrally formed.

[0148] The main body 111 provides a support surface for the cutting machine 100 when placed horizontally, providing greater stability. The motor shaft 121 extends along a motor axis 122, which intersects the support surface at an angle. This axis 122 is compatible with output mechanisms such as the transmission assembly 140 described later, effectively reducing the overall length of the machine. In some embodiments, the angle between the motor axis 122 and the support surface is between 15° and 60°.

[0149] The output shaft 130 is located outside the housing 110, parallel to the support surface and extending in the left-right direction of the housing 110. The output shaft 130 extends along an output axis 131, which is parallel to the support surface. The output axis 131 may intersect with the motor axis 122. In some embodiments, the motor shaft 121 and the output shaft 130 are substantially perpendicular, that is, the motor axis 122 is perpendicular to the output axis 131. In some embodiments, the motor axis 122 and the output axis 131 are arranged at an angle.

[0150] Transmission assembly 140 includes a long shaft 141 and a bevel gear set 142. Long shaft 141 is connected and colinear with motor shaft 121. Bevel gear set 142 connects between long shaft 141 and output shaft 130 to transmit power. Motor 120 drives long shaft 141 to rotate, which in turn transmits power to output shaft 130 via bevel gear set 142.

[0151] The bevel gear set 142 includes a first bevel gear 1421 and a second bevel gear 1422. The first bevel gear 1421 is disposed on the long shaft 141, and the second bevel gear 1422 is disposed on the output shaft 130. The first bevel gear 1421 meshes with the second bevel gear 1422. In some embodiments, the first bevel gear 1421 and the long shaft 141 are integrally formed.

[0152] The cutting machine 100 also includes a second housing 160, which is connected to the housing 110 and is at least partially located outside the housing 110. The second housing 160 can be located between the housing 110, the output shaft 130, and the saw blade 150. The transmission assembly 140 is at least partially located within the second housing 160. In some embodiments, the second housing 160 that accommodates the transmission assembly 140 constitutes a gearbox and a bearing chamber. The provision of the second housing 160 facilitates assembly, replacement, and maintenance. The central axis of the second housing 160 intersects the support surface at an angle. The second housing 160 extends along a central axis, which is parallel to the axis of the long axis 141. In some embodiments, the central axis coincides with the axis of the long axis 141.

[0153] The second housing 160 or the gear box containing the transmission assembly 140 is filled with semi-solid grease for lubrication, etc., and is usually a closed space. However, due to the influence of working conditions, such as high-power operation or high ambient temperature, the temperature and pressure in the cavity will increase, and the lubricant is prone to leak at weak seals. To improve the above problem, in some embodiments, the second housing 160 is provided with a through hole 165 for air flow and / or lubricant to flow, and the second housing 160 is also equipped with an expansion cover 164 that can cover the through hole 165. The expansion cover 164 and the second housing are connected. 160 is sealed and connected, and the expansion cover 164 can be elastically deformed to form a volume-variable, airtight, and oil-tight closed space outside the above-mentioned through hole 165 of the second housing 160. Therefore, when the temperature and / or air pressure increases, the gas and / or lubricant in the second housing 160 or the gearbox can enter the above-mentioned volume-variable closed space formed by the expansion cover 164 and the second housing 160 through the above-mentioned through hole 165. The air pressure in the cavity is balanced with the external atmospheric pressure, and the lubricant will not leak, thereby ensuring that the cutting machine 100 always operates smoothly. In some embodiments, the above-mentioned expansion cover 164 can be made of a soft rubber material such as rubber or silicone, or can also be made of other soft and elastic materials that are airtight and oil-tight.

[0154] In some embodiments, reference Figure 31 、 Figure 32The second housing 160 includes a second housing body 161, a first end cover 162, and a second end cover 163. The first end cover 162 can be mounted to the second housing body 161 and sealed, forming a first accommodation space therebetween, that is, forming a gearbox inner cavity for accommodating the transmission assembly 140, in which the long shaft 141 and the bevel gear set 142 can be disposed. The through hole 165 can be formed on the first end cover 162, and the expansion cover 164 can cover the through hole 165 and be sealed to the first end cover 162. The second end cover 163 can be mounted to the first end cover 162 and form a second accommodation space therebetween. In some embodiments, the second accommodation space can accommodate at least the bearing assembly used to support the output shaft 130, that is, forming a bearing chamber inner cavity for accommodating the bearing assembly of the output shaft 130.

[0155] The first and second end covers 162 and 163 are located between the second housing body 161 and the guard 220, and the second end cover 163 is closer to the guard 220. The first and second end covers 162 and 163 are provided with through holes for the output shaft 130 to pass through. It can be understood that they are different from the through holes 165 for the circulation of air flow and / or lubricant in the previous text. The output shaft 130 can be connected to the second bevel gear 1422 in the gear box cavity, and pass through the gear box cavity and the bearing chamber cavity in turn through the through holes on the first and second end covers 162 and 163, and then pass through the guard 220 to install and drive the saw blade 150.

[0156] The expansion cover 164 may be disposed within the second accommodation space formed between the first end cover 162 and the second end cover 163. In some embodiments, such as Figure 32 As shown, the first and second end covers 162 and 163 have docking portions 166 facing each other for clamping and fixing the expansion cover 164. When the second end cover 163 is installed to the first end cover 162, the docking portions 166 of the two clamp the expansion cover 164 therebetween. Furthermore, the docking portion 166 also divides the second accommodating space formed between the first and second end covers 162 and 163 into a space for accommodating the above-mentioned bearing assembly without communicating with the outside world or the gear box, and a space for accommodating the expansion cover 164 that can communicate with the outside world and the gear box. The latter, that is, the space where the expansion cover 164 is located is separated by the expansion cover 164. One side forms a closed space with the first end cover 162 that is open only to the through hole 165 on the first end cover 162 through which air / oil circulates and is connected to the gear box, and the other side forms an open space with the second end cover 163 and the opening 167 thereon that is connected to the outside world.

[0157] See also Figures 4 to 7The cutting machine 100 also includes a shaft lock assembly 170 arranged on the second housing 160, and the shaft lock assembly 170 includes an operating member 171 and a shaft lock member 172 connected to each other; a shaft lock groove 1411 is circumferentially provided on the long shaft 141 for the shaft lock member 172 to be embedded, and the shaft lock groove 1411 extends in a direction parallel to the long axis 141. In some embodiments, the shaft lock groove 1411 is provided on a component that is sleeved on the long shaft 141; the operating member 171 is operated by the user to push the operating member 171 and the shaft lock member 172 in a direction parallel to the long axis 141, so that the shaft lock member 172 is embedded in the shaft lock groove 1411, thereby locking the rotation of the output shaft 130.

[0158] The shaft lock assembly 170 has an unlocked state and a locked state. In the locked state, the output shaft 130 can be locked by the shaft lock assembly 170, preventing the transmission assembly 140 from rotating with the saw blade, thereby facilitating the installation and removal of the saw blade. It also prevents the saw blade 150 from being accidentally struck and rotated when not in use, thus ensuring safety. The operating member 171 is a push-type, which allows the shaft lock member 172 to engage the shaft lock groove 1411, locking the rotation of the long shaft 141, and thus locking the rotation of the output shaft 130. The pushing direction of the operating member 171 is parallel to the long shaft 141. When using the cutting machine 100, the shaft lock assembly 170 can be switched to the unlocked state by pushing the operating member 171, which is convenient for operation.

[0159] At least a portion of operating member 171 protrudes from second housing 160, facilitating user operation of shaft lock assembly 170. A clearance opening is provided on second housing 160 for operating member 171 to extend through. Operating member 171 is elastically connected to second housing 160 and is capable of sliding in a direction parallel to longitudinal axis 141. The clearance opening extends along longitudinal axis 141. Operating member 171 is provided with a protrusion that protrudes from housing 110 through the clearance opening, facilitating user movement of operating member 171.

[0160] refer to Figures 35 to 38 , provides another optional implementation of the shaft lock assembly 170. Figure 35As shown, similar to the above, the shaft lock assembly 170 includes a shaft lock member 172 that can be embedded in the shaft lock groove 1411 to lock the rotation of the output shaft 130. The shaft lock groove 1411 can be connected to or formed on the transmission assembly 140, such as the long shaft 141. Specifically, a shaft lock disk containing the shaft lock groove 1411 can be sleeved on the long shaft 141. Of course, in other embodiments, the shaft lock groove 1411 may also be directly provided on the motor shaft 121 or the output shaft 130. The shaft lock assembly 170 also includes a support limit member 173 and an elastic member 174. The elastic member 174 abuts against the shaft lock member 172 and relies on its own elastic deformation to always give the shaft lock member 172 a movement tendency to embed in the shaft lock groove 1411. For example, the elastic member 174 can be a spring that is always in a compressed state or a stretched state, and one end of the elastic member 174 is fixed. The shaft lock member 172 will rotate upward or downward under the constraint of the support limit member 173 and the drive of the elastic member 174 to disengage from or embed into the above-mentioned shaft lock groove 1411, thereby achieving the switching of the shaft lock assembly 170 between the unlocked state and the locked state.

[0161] In this embodiment, the operating member 171 may be rotatable and may be connected to or formed on the above-mentioned shaft lock member 172. The operating member 171 rotates to switch between the unlocked position and the locked position, and the shaft lock assembly 170 may convert the rotation of the operating member 171 into the rotational rise or rotational fall of the shaft lock member 172. When the operating member 171 is rotated to the unlocked position, the shaft lock assembly 170 is in an unlocked state, and the shaft lock member 172 is disengaged from the shaft lock groove 1411; when the operating member 171 is rotated to the locked position, the shaft lock assembly 170 is in a locked state, and the shaft lock member 172 is embedded in the shaft lock groove 1411. In some embodiments, the operating member 171 may be disposed on the second housing 160. In some embodiments, the rotation axis of the operating member 171 is colinear with, or parallel to, the rotation axis of the shaft lock member 172.

[0162] There are many possible connections between the operating member 171, the shaft lock member 172, and the support and limit member 173. In some embodiments, the support and limit member 173 is fixedly connected to the second housing 172, and the operating member 171 is fixedly connected to the shaft lock member 172. The operating member 171 and the shaft lock member 172 are movably connected to the support and limit member 173 and the second housing 160 and can rotate and translate relative to each other. The following mainly describes this embodiment. In other embodiments, the operating member 171 can also be non-fixedly connected to the shaft lock member 172, and there may be an intermediate member between the two, as long as the rotation of the operating member 171 can be converted into the rotation and rise or rotation and fall of the shaft lock member 172. In still other embodiments, the operating member 171 can also be fixedly connected to the support and limit member 173, and both are movably connected to the shaft lock member 172 and the second housing 160, and can rotate and translate relative to the shaft lock member 172, and can rotate relative to the second housing 160.

[0163] In some embodiments, the support and stop member 173 includes a spiral track 1731 disposed circumferentially along the axis locking member 172. The axis locking member 172 is connected to or formed with a mating portion 1721 that is constrained by and moves along the spiral track 1731. The movement of the mating portion 1721 drives the axis locking member 172 to rotate upward or downward. In some embodiments, the axis locking member 172 includes a radially protruding mating portion 1721. For example, a mating pin can be inserted radially along the axis locking member 172 to serve as the mating portion 1721. The support and stop member 173 can be sleeved outside the axis locking member 172 and have a circumferentially inclined slope that abuts the mating pin. It is understood that the spiral track is not strictly required to be disposed along a spiral line circumferentially along the support and stop member 173; it is sufficient that it can roughly meet the corresponding circumferential and axial movement of the axis locking member 172 during rotation and translation. In some embodiments, the support limit member 173 is at least partially accommodated in the operating member 171. Specifically, the operating member 171 is provided with an accommodating groove facing the shaft locking member 172 and the support limit member 173. One end of the operating member 171 and / or the shaft locking member 172 can be partially extended into the accommodating groove, and the spiral track 1731 can be at least partially accommodated in the accommodating groove.

[0164] In some embodiments, locking portions 1732 are provided at both ends of the spiral track 1731 supporting the stopper 173. When the engaging portion 1721 moves to either end of the spiral track 1731, it is restrained by the locking portions 1732 and remains in that position, thereby maintaining the shaft lock assembly 170 in a locked or unlocked state. In some embodiments, the locking portions 1732 include locking grooves provided at either end of the spiral track 1731, into which the engaging portion 1721 falls to achieve self-locking. The locking portions 1732 may also include a blocking wall provided at the end of the spiral track 1731 that the engaging portion 1721 reaches under the drive of the elastic member 174.

[0165] like Figure 37 、 Figure 38As shown, the support limit member 173 is fixedly installed on the second housing 160, and the shaft lock member 172 is in the shape of a rod that passes through the support limit member 173 and extends into the second housing 160 to act on the shaft lock groove 1411. The operating member 171 is in the shape of a cap and is sleeved on the end of the support limit member 173 away from the shaft lock groove 1411 and is fixedly connected to the shaft lock member 172. The elastic member 174 sleeved on the shaft lock member 172 is always in a compressed state, with one end away from the shaft lock groove 1411 fixed and the other end abutting against the shaft lock member 172. The shaft lock member 172 driven by the elastic member 174 rotates up or down because its radially extending pin-shaped mating portion 1721 is constrained in the circumferential direction by the spiral track 1731. When the operating member 171 rotates from the unlocked position to the locked position, the external force of the rotation of the operating member 171 causes the mating portion 1721 of the shaft lock member 172 fixed to it, which originally fell into the locking groove 1732 at one end of the spiral track 1731 and was in a self-locking state, to be driven out of the locking groove 1732 and disengage from the self-locking state. The shaft lock member 172 then rotates and descends under the drive of the elastic member 174 and the constraint of the spiral track 1731 on the mating portion 1721 and is embedded in the lower shaft lock groove 1411 until the mating portion 1721 reaches the other end of the spiral track 1731 and is limited by the blocking wall 1732, and cannot move further. The shaft lock assembly 170 remains in a locked state.

[0166] When the operating member 171 is rotated from the locked position to the unlocked position, the external force of the rotation of the operating member 171 will cause the shaft lock member 172 fixed to it to overcome the drive of the elastic member 174. The blocking wall 1732 of the original limiting fitting part 1721 no longer works due to the reverse movement of the fitting part 1721. The shaft lock member 172 rotates and rises under the constraint of the spiral track 1731 on the fitting part 1721, and disengages from the shaft lock groove 1411 until the fitting part 1721 falls into the locking groove 1732 at the other end of the spiral track 1731 and cannot move further. The shaft lock assembly 170 remains in the unlocked state.

[0167] In some embodiments, a guide surface 1412 is provided between adjacent shaft locking grooves 1411. When the shaft locking member 172 rotates and translates and the shaft locking groove 1411 is not exactly located above or below the shaft locking member 172, the shaft locking member 172 rotates and translates to the guide surface 1412 and can slide relative to the shaft locking groove 1411 along the guide surface 1412 to finally fit into the shaft locking groove 1411. Specifically, the guide surface 1412 can be an arcuate surface or an inclined surface between adjacent shaft locking grooves 1411, and the edge of the guide surface 1412 can be flush with the opening of the shaft locking groove 1411. Taking the shaft locking disk as an example, multiple shaft locking grooves 1411 can be radially opened toward the center of the circle, and adjacent shaft locking grooves 1411 can be spaced at equal distances or angles. The outer peripheral surface of the shaft locking disk between the shaft locking grooves 1411 can serve as the guide surface 1412.

[0168] In addition to being used in the above-mentioned cutting machine 100, the shaft lock assembly 170, which includes an operating part 171, a shaft lock part 172, a support limit part 173 and an elastic part 174, can also be derived and applied to other types of power tools. A shaft lock groove is set on the motor shaft, output shaft or transmission assembly, and the shaft lock assembly 170 realizes locking and releasing of the output shaft in the manner described above.

[0169] A bearing is provided between the long shaft 141 and the second housing 160 to support the long shaft 141. The second housing 160 is provided with a bearing chamber for mounting the bearing. The second housing 160 can be a split structure to facilitate mounting the transmission assembly 140 and the output shaft 130. A bearing is provided between the output shaft 130 and the second housing 160 to support the output shaft 130.

[0170] See also Figures 1 to 5 、 Figures 8 to 20 The cutting machine 100 also includes a circuit board assembly 180, which includes a circuit board 181 and a heat sink 182. The circuit board 181 is connected to the heat sink 182. During use, the circuit board 181 generates heat, and the heat is transferred to the heat sink 182. The heat sink 182 is used to physically dissipate heat from the circuit board 181. The housing 110 has an opening, and the heat sink 182 is at least partially exposed relative to the housing 110 through the opening. The heat sink 182 can be exposed to the outside of the housing 110 or opposite to the opening of the housing 110, enabling contact and heat exchange with the external space, achieving natural heat dissipation and improving the heat dissipation effect.

[0171] Circuit board 181 is positioned on one side of heat sink 182, with surface-to-surface contact between circuit board 181 and heat sink 182. This increases the contact area and improves heat dissipation. In some embodiments, heat sink 182 is a heat sink. In some embodiments, heat sink 182 is a heat sink. In some embodiments, heat sink 182 is made of aluminum.

[0172] When heat sink 182 is a heat sink, the side of the heat sink facing away from circuit board 181 has multiple heat dissipation holes 1821. These holes extend through the heat sink parallel to the plane of circuit board 181, increasing the heat dissipation area and improving heat dissipation efficiency. In some embodiments, circuit board 181 is positioned at the top of the heat sink, and heat dissipation holes 1821 are positioned at the bottom of the heat sink. The bottom of the heat sink is exposed to the exterior of housing 110 or faces an opening of housing 110. The top of the heat sink is provided with a cavity for accommodating circuit board 181.

[0173] The circuit board 181 is located below the motor 120 , and the projections of the circuit board 181 and the motor 120 in the vertical direction at least partially overlap, thereby fully utilizing the space and making a reasonable layout.

[0174] The cutting machine 100 also includes a heat conductor 190 connected to the housing 110. The heat conductor 190 is at least partially located outside the housing 110. The heat sink 182 is at least partially exposed relative to the housing 110 through an opening and in thermal contact with the heat conductor 190. Heat from the heat sink 182 can be transferred to the heat conductor 190, which then contacts the external space for heat exchange, achieving natural heat dissipation and further improving the heat dissipation effect.

[0175] In some embodiments, the opening is located on the front bottom surface of the housing 110. The heat conducting member 190 is connected to the housing 110 around the opening and has a heat conducting surface covering the opening. The heat sink 182 is in contact with the heat conducting surface. This surface-to-surface contact increases the contact area between the heat sink 182 and the heat conducting member 190, increasing the heat conducting area efficiency and improving the heat dissipation effect.

[0176] The heat conductor 190 is a wear-resistant metal part that improves the heat dissipation effect. In some embodiments, the heat conductor 190 is bent into a U-shape or a V-shape to fit the housing 110. The edge of the heat conductor 190 is bent to cover the periphery of the opening of the housing 110. In some embodiments, the heat conductor 190 is covered at the intersection of the bottom and the front of the main body 111. The heat conductor 190 and the housing 110 can be connected by screws. In some embodiments, the heat conductor 190 is made of nickel-iron alloy.

[0177] Thermal conductor 190 not only conducts heat but also provides support. The bottom surface of thermal conductor 190 forms or supports the support surface, which supports cutting machine 100 when it is placed horizontally. By configuring thermal conductor 190 as a wear-resistant metal component, wear is reduced, ensuring heat dissipation and support.

[0178] The cutting machine 100 further includes a sealing member 183, which is disposed around the opening and fills the gaps between the housing 110, the heat sink 182, and the heat conductor 190. The sealing member 183 is used to prevent water from entering the housing 110. The sealing member may be a sealing ring, a sealing strip, or other sealing structures. Figure 19 As shown, the seal 183 is a sealing ring made of rubber material, which is mounted on the bottom of the heat dissipation box and completely fills the gap between the heat dissipation box and the bottom opening of the casing 110. It also has a positioning and protective edge extending a certain length toward the periphery along the heat conduction plane.

[0179] In some embodiments, the thermal conductor 190, the heat sink 182, and the second housing 160 are connected; the heat sink 182, the thermal conductor 190, the second housing 160, and the saw blade 150 are all made of conductive materials. Static electricity generated during the cutting process is transferred to the saw blade 150 through the heat sink 182, the thermal conductor 190, and the second housing 160 and then released to the ground. In some embodiments, the thermal conductor 190 is fixedly connected to the housing 110, and the connection between the thermal conductor 190 and the second housing 160 can be abutting or overlapping to facilitate the transfer of static electricity. In some embodiments, any two of the heat sink 182, the thermal conductor 190, the second housing 160, and the saw blade 150 can be connected using screws or bolts made of conductive materials.

[0180] The cutting machine 100 provided in the present application not only dissipates heat by contacting the heat dissipating member 182 with the heat conducting member 190 , but also dissipates heat by spraying coolant onto the saw blade 150 , thereby combining natural heat dissipation and water cooling to improve the heat dissipation effect.

[0181] The cutting machine 100 also includes a liquid cooling system 210. The liquid cooling system 210 sprays coolant onto the saw blade 150 while the saw blade 150 is cutting. After the coolant leaves the saw blade 150, it travels through the heat conductor 190. By spraying coolant onto the heat conductor 190, the heat conductor 190 is cooled, combining natural heat dissipation with water cooling to further enhance the heat dissipation effect of the heat conductor 190 on the circuit board 181 and the like. Normally, the saw blade 150 rotates counterclockwise. As the saw blade 150 rotates, the coolant sprayed by the liquid cooling system 210 is driven by the rotating saw blade 150 and is essentially ejected from the bottom of the saw blade 150 along a tangential direction of the saw blade 150. The water jet is ejected toward the heat conductor 190 by inertia. Figure 8 The direction of the arrow in the middle shows the spray direction of part of the coolant.

[0182] The liquid cooling system 210 includes a transmission tube 211 for transmitting coolant. In some embodiments, a slot is formed in the bottom of the housing 110 for the transmission tube 211 to pass through. The extension path of the transmission tube 211 is in contact with the housing 110 around the circuit board assembly 180. The flow of coolant in the transmission tube 211 removes some of the heat emitted by the circuit board 181, further improving the water-cooling heat dissipation effect. Some transmission tubes 211 can be squeezed into the slots in the housing 110, while others can be restrained by buckles or clamps to ensure a stable position of the transmission tube 211.

[0183] The projections of the transmission tube 211 and the circuit board 181 in the vertical direction at least partially overlap; and / or the projections of the transmission tube 211 and the heat sink 182 in the vertical direction at least partially overlap. This effectively dissipates heat while fully utilizing space, resulting in a compact structure and a reasonable layout. In some embodiments, the transmission tube 211 is positioned above the circuit board 181. In other embodiments, the transmission tube 211 may not overlap with the circuit board assembly 180 in the vertical direction to prevent moisture introduced by the transmission tube 211 from affecting the safety of the circuit board assembly 180.

[0184] One of the benefits of the present application is that the casing has an opening, and the heat sink is at least partially exposed relative to the casing through the opening and is in thermal contact with the heat conductor. The heat sink connected to the circuit board in the cutting machine can achieve contact and heat exchange with the space outside the casing through the casing opening, and can also transfer heat to the heat conductor outside the casing through thermal contact with the heat conductor, thereby having an excellent heat dissipation effect.

[0185] The cutting machine 100 also includes a guard 220, within which the saw blade 150 is partially housed. The liquid cooling system 210 includes a left nozzle 212 and a right nozzle 213. The left nozzle 212 is disposed on the left end surface of the guard 220, while the right nozzle 213 is disposed on the right end surface of the guard 220. The left nozzle 212 and the right nozzle 213 extend through the guard 220 to deliver coolant. Of course, the liquid cooling system 210 of the cutting machine 100 may also utilize only a single nozzle to cool the saw blade 150. The nozzle-related embodiments described below are also applicable to single nozzles.

[0186] In some embodiments, as Figures 17 to 20 as well as Figure 30 As shown, the left nozzle 212 may include a first member 2121 and a second member 2122. The first member 2121 is connected to the shield 220, for example, by being snap-fitted to the left and right end surfaces of the shield 220 via slots. The first member 2121 also includes a through-hole extending through the shield 220. The transmission tube 211 may be connected to the first member 2121 to connect with the through-hole and thereby deliver coolant. For example, the first member 2121 may include a protrusion for the transmission tube 211 to fit over, which extends through the interior and connects to the through-hole. In some embodiments, the first member 2121 and the shield 220 may also feature a fool-proof design to ensure correct installation. The second piece 2122 is detachably connected to the first piece 2121. When the second piece 2122 is mounted on the first piece 2121, the end of the through hole away from the saw blade 150 is blocked and closed by the second piece 2122. When the second piece 2122 is removed from the first piece 2121, the end of the through hole away from the saw blade 150 is opened outward. Figure 20As shown, the first member 2121 has a through-hole colinear with the output shaft 130. This through-hole has a circumferentially connected branch for the transmission tube 211 to connect. The second member 2122 is a nut threadedly engaged with the outer circumferential surface of the first member 2121. When tightened, the nut blocks and seals the through-hole at the end away from the saw blade 150, allowing coolant from the transmission tube 211 to be sprayed unidirectionally to the saw blade 150. When removed, the through-hole is open at both ends, allowing the user to conveniently and effectively clean dust and debris clogged in the through-hole using a needle-shaped or rod-shaped member. In some embodiments, the second member 2122 can be the same model as the nut used to attach the saw blade 150 to the output shaft 130, making the related accessories more versatile and less complicated. In some embodiments, a waterproof ring is further provided within the second member 2122 or the nut. The contact surface between the second member 2122 and the first member 2121 and / or the contact surface between the second member 2122 and the shield 220 is sealed and waterproofed by the waterproof ring. Equivalently, in some embodiments, the right nozzle 213 may also include a first piece and a second piece. In some embodiments, the left and right nozzles 212 and 213 are aluminum pieces that are wear-resistant and easy to process.

[0187] In some embodiments, the transmission tube 211 extends from the front end of the housing 110 between the second housing 160 and the shield 220, passes over the shield 220, and connects to the left nozzle 212 and the right nozzle 213. The transmission tube 211 is fixedly connected to the second housing 160, for example, by screws.

[0188] The shield 220 is provided with a shield handle 230 for the user to operate to rotate the shield 220. The transmission tube 211 is restrained by the shield handle 230 when it passes over the shield 220. The shield handle 230 and the shield 220 can be locked together using screws. In some embodiments, the transmission tube 211 is sandwiched between the shield 220 and the shield handle 230. In some embodiments, the transmission tube 211 is inserted through the shield handle 230.

[0189] The cutting machine 100 also includes a support guide 240 having a support portion 241 positioned between the second housing 160 and the shield 220. The transmission tube 211 is disposed through and restrained by the support portion 241. In some embodiments, the support portion 241 is provided with a groove for the transmission tube 211 to pass through. In some embodiments, the support portion 241 is provided with a conduit for the transmission tube 211 to pass through. The support guide 240 and the shield 220 can be fastened together using screws.

[0190] The support guide 240 also has a guide groove located behind the shield 220. A portion of the shield 220 is inserted into the guide groove, which supports and guides the shield 220 without affecting the rotation of the shield 220. In some embodiments, the support guide 240 has a split structure to facilitate installation and disassembly. The support guide 240 includes a support portion 241 and a guide portion 242. The support portion 241 and the guide portion 242 are distributed on the left and right sides of the shield 220. The support portion 241 and the guide portion 242 interlock with each other to form a guide groove. The support portion 241 and the guide portion 242 can be threadedly connected to the shield 220.

[0191] A water shield 250 is provided below the guard 220. The liquid cooling system 210 sprays coolant onto the saw blade 150 during cutting. The water shield 250 reduces water splashing and prevents water from entering the housing 110. The water shield 250 can be screwed to the guard 220. The water shield 250 and the guide portion 242 can be integrally formed for ease of processing and production.

[0192] The second housing 160 is located at the front of the housing 110, and the shield 220 is located at the front of the housing 110. The second housing 160 and the shield 220 are arranged in the left-right direction, and the support guide 240 is clamped between the second housing 160 and the shield 220. The second housing 160, the support guide 240 and the shield 220 are connected to increase structural strength.

[0193] In some embodiments, the liquid cooling system 210 further includes a liquid inlet valve 214. The transmission pipe 211 is used to transmit the coolant, and the liquid inlet valve 214 is provided on the transmission pipe 211. The liquid inlet valve 214 is located outside the housing 110, so that it can be easily operated by the user. In some embodiments, the liquid inlet valve 214 is provided on the rear side of the grip portion, and the user can operate the liquid inlet valve 214 when gripping the grip portion. Continuing from the foregoing, the grip portion includes a main handle 112 located behind the main body 111. In some embodiments, the liquid inlet valve 214 can be provided on the lower right side of the main handle 112 and can be directly connected to the water inlet.

[0194] In some embodiments, the flow rate of the coolant in the transmission pipe 211 is constant, and the inlet valve 214 acts as a switch. In some embodiments, the inlet valve 214 adjusts the flow rate of the coolant in the transmission pipe 211. The inlet valve 214 can be screwed to the housing 110. In some embodiments, the inlet valve 214 is a rotary ball valve, and the valve opening of the inlet valve 214 is adjustable, thereby regulating the flow rate of the coolant in the transmission pipe 211.

[0195] The cutting machine 100 provided herein also utilizes air cooling for heat dissipation. The cutting machine 100 further includes a fan 260 mounted on the motor shaft 121. The housing 110 has an air inlet 114 and an air outlet 115. The cooling airflow enters the housing 110 through the air inlet 114, flows sequentially through the circuit board assembly 180 and the motor 120, and is blown out through the air outlet 115, simultaneously dissipating heat from the circuit board assembly 180 and the motor 120.

[0196] As the heat dissipation airflow passes through the circuit board assembly 180, it passes through the heat sink 182, removing heat from the heat sink 182. In some embodiments, the heat sink 182 is a heat sink box. The side of the heat sink box facing away from the circuit board 181 has multiple heat dissipation holes 1821. The heat dissipation holes 1821 extend through the heat sink box in a direction parallel to the plane of the circuit board 181. By providing the heat dissipation holes 1821 in the heat sink box, the heat dissipation area is increased, the air flow rate on the heat dissipation surface is increased, and the heat dissipation effect is improved.

[0197] In some embodiments, the heat dissipation holes 1821 extend along the left-right direction of the housing 110. In some embodiments, the heat dissipation holes 1821 extend along a straight line. In some embodiments, the heat dissipation holes 1821 extend along a curve to extend the heat dissipation path. In some embodiments, multiple heat dissipation holes 1821 are distributed in multiple rows along the front-to-back or top-to-bottom direction.

[0198] In some embodiments, the cutting machine 100 further includes an air deflector 270 connected to the housing 110 and located within the housing 110. The housing 110, air deflector 270, and heat sink form a first airflow channel between the air inlet 114 and the heat dissipation holes 1821. After entering the housing 110 from the air inlet 114, the heat dissipation airflow sequentially passes through the first airflow channel and the heat dissipation holes 1821. The first airflow channel is substantially sealed between the air inlet 114 and the heat dissipation holes 1821. The air deflector 270 guides the heat dissipation airflow. The provision of the sealed first airflow channel facilitates the formation of a negative pressure within the first airflow channel, thereby promoting the smooth flow of external air into the housing 110.

[0199] The shape of the air guide plate 270 can be set according to actual needs to guide the air flow to the heat sink 182. In some embodiments, the air guide plate 270 is stepped. The air guide plate 270 can be screwed to the housing 110.

[0200] The housing 110 has an air outlet 115, and the motor 120 has a motor housing 123. The housing 110 and the motor housing 123 form a second airflow channel between the motor 120 and the air outlet 115. The heat dissipating airflow flows through the motor 120 within the motor housing 123 and is then blown out of the air outlet 115 through the second airflow channel. This second airflow channel is substantially sealed between the motor 120 or the motor housing 123 and the air outlet 115. The provision of this sealed second airflow channel facilitates the formation of a negative pressure within the second airflow channel, promoting the smooth flow of external air into the motor housing 123.

[0201] When the motor 120 rotates, it drives the fan 260 to rotate, so that negative pressure is formed in the first air flow channel and the second air flow channel. The external air flow enters the casing 110 from the air inlet 114, passes through the first air flow channel and the heat dissipation hole 1821 in turn, enters the motor casing 123, flows through the motor 120 in the motor casing 123, and is blown out from the air outlet 115 through the second air flow channel. Figure 11 、 Figure 12 、 Figure 14 and Figure 16 The dashed arrows in FIG. 1 show the direction of air flow.

[0202] In some embodiments, the heat dissipation box is located below the motor 120, and the projections of the heat dissipation box and the motor 120 in the vertical direction at least partially overlap, so that the heat dissipation airflow passes through the heat dissipation holes 1821 and then enters the motor housing 123 through the inner cavity of the housing 110.

[0203] In some embodiments, the air inlet 114 is located at the rear of the housing 110, and the air outlet 115 is located at the front of the housing 110, guiding the airflow from the back to the front, extending the flow path of the heat dissipation airflow, and the heat dissipation airflow flows through components such as the circuit board 181, the heat dissipation box, and the motor 120, achieving comprehensive heat dissipation. In some embodiments, the air inlet 114 is located on the left and / or right wall of the middle and rear portion of the housing 110, and the air outlet 115 is located at the front of the housing 110. In some embodiments, the air outlet 115 is located on the left and / or right wall of the front of the housing 110. In some embodiments, the air outlet 115 is located on the left and / or right wall of the front of the housing 110. In some embodiments, the air outlet 115 is located on the left and right walls of the front of the housing 110, and the air outlet 115 is open to both sides to improve the heat dissipation effect.

[0204] In some embodiments, the air inlet 114 includes multiple air inlet holes, which are spaced apart on the housing 110 to fully utilize the air inlet space on the housing 110 and increase the air inlet area. The air inlet holes are circular, oval, or elongated. In some embodiments, the air outlet 115 includes multiple air outlet holes, which are spaced apart on the housing 110 to fully utilize the air outlet space on the housing 110 and increase the air outlet area. The air outlet holes are circular, oval, or elongated.

[0205] The air-cooling heat dissipation path is isolated from the water-cooling heat dissipation path, so that the water-cooling coolant will not spray into the interior of the housing 110 .

[0206] See also Figures 17 to 22 The cutting machine 100 also includes a shield adjustment mechanism 280, through which the shield 220 is connected to the second housing 160, and the shield adjustment mechanism 280 includes an adjusting bolt 281 and an adjusting handle 282; a rotating track 221 is provided on the side of the shield 220 close to the second housing 160, one end of the adjusting bolt 281 is fixedly connected to the second housing 160, and the other end is rotatably connected to the shield 220 through the rotating track 221, and the adjusting handle 282 releases or locks the relative rotation of the adjusting bolt 281 and the shield 220, thereby locking or releasing the relative rotation of the second housing 160 and the shield 220.

[0207] In some embodiments, the rotational centerline of the shield 220 coincides with the output axis 131 of the output shaft 130, and the rotating track 221 is arranged in an arc shape around the rotational centerline to facilitate smooth rotation. An adjusting bolt 281 is threadedly connected to the second housing 160. An adjusting handle 282 is provided at one end of the adjusting bolt 281, and the other end of the adjusting bolt 281 is capable of abutting against an elastic washer 283, allowing at least a portion of the elastic washer 283 to be inserted into the rotating track 221. The friction between the elastic washer 283 and the shield 220 locks the shield 220.

[0208] The shield adjustment mechanism 280 performs stepless adjustment on the rotation angle of the shield 220 around the output shaft 130 . The shield 220 can rotate around the output shaft 130 within a range of 0° to 45°. Figure 21 The shield 220 is shown in the first position. Figure 22 The figure shows the state when the shield 220 is in the second position. The shield 220 rotates from the first position to the second position, and the rotation angle is 45°.

[0209] Continuing from the above, the transmission pipe 211 can pass between the second housing 160 and the shield 220 and then cross over the shield 220 and be connected to the left and right nozzles 212 and 213. The shield 220 is adjusted by the shield adjustment mechanism 280 and can rotate around the output shaft 130 within a certain angle range. The transmission pipe 211 connected to one or more of the second housing 160, the shield 220, and the left and right nozzles 212 and 213 may bend during the rotation of the shield 220, resulting in poor water discharge. In some embodiments, such as Figure 29As shown, at least part of the transmission pipe 211 may be provided with an elastic support member 2112 to support the water channel space in the pipe when the protective cover 220 rotates and prevent the transmission pipe 211 from bending and blocking water. Specifically, a spring is filled in at least part of the transmission pipe 211 located between the second housing 160 and the protective cover 220 or the left nozzle 212 or the right nozzle 213.

[0210] See also Figure 1 、 Figure 10 、 Figures 23 to 25 , the cutting machine 100 also includes a battery pack 290, which at least powers the motor 120. A battery compartment 1111 is formed inside the main body 111 of the casing 110, and the battery compartment 1111 is used to install the battery pack 290. In order to maintain the balance of the entire machine, the motor 120 is located on the front side of the main body 111, and the battery pack 290 is located on the rear side of the main body 111. In the present application, the casing 110 of the cutting machine 100 includes a main body 111 and a battery compartment cover 116. By closing the battery compartment cover 116, a battery compartment 1111 that is sealed and extends in the left and right directions can be formed in the main body 111. The battery pack 290 can be combined with the battery compartment 1111 along the left and right directions of the casing 110 to adapt to the layout of the entire machine. In some embodiments, the main body 111 has a partition separating the front portion where the motor 120 is located and the battery compartment 1111 where the battery pack 290 is located, so that the front portion of the main body 111 that adopts air cooling does not affect the sealing of the battery compartment 1111.

[0211] The battery pack 290 and battery compartment 1111 are detachably connected to facilitate replacement of the battery pack 290. Specifically, this connection can be a snap-on, threaded, or magnetic connection. In some embodiments, one of the battery pack 290 and battery compartment 1111 is provided with a first latch 291, and the other is provided with a first latch slot. The first latch 291 cooperates with the first latch slot to lock the battery pack 290 with the battery compartment 1111. In some embodiments, the first latch 291 is provided on the outer shell of the battery pack 290, and the first latch slot is provided on the inner wall of the battery compartment 1111.

[0212] The cutting machine 100 also includes a battery pack ejection mechanism 310, which is arranged on the inner wall of the battery compartment 1111. When the first clip 291 is disengaged from the first slot, the battery pack ejection mechanism 310 ejects the battery pack 290 at least partially out of the battery compartment 1111 along the insertion and removal direction.

[0213] The battery pack ejection mechanism 310 includes an ejection member, which is elastic. When the battery pack 290 is installed in the battery compartment 1111, the ejection member is compressed and deformed. When the first clip 291 is disengaged from the first slot, the ejection member recovers its deformation under the action of the elastic force and applies an external force to the battery pack 290 to separate from the battery compartment 1111, so that the battery pack 290 at least partially pops out of the battery compartment 1111, making it easier to disassemble the battery pack 290.

[0214] The battery pack 290 includes a third operating member 294, which can be pressed to disengage the first latch 291 from the first slot. When removing the battery pack 290, the third operating member 294 can be pressed to disengage the first latch 291 from the first slot. The ejector member recovers its deformation under the action of elastic force, applying an external force to the battery pack 290 to disengage it from the battery compartment 1111. When the battery pack 290 is locked with the battery compartment 1111, the third operating member 294 is located in a position that is convenient for user operation. In some embodiments, the first latch 219 is located at the top of the battery pack 290, and the third operating member 294 is located at the upper left or upper right portion of the battery pack 290 near the battery compartment cover 116.

[0215] The third operating member 294 is linked to the first clip 291, and the first clip 291 is elastically connected to the shell of the battery pack 290. By pressing or releasing the third operating member 294, the first clip 291 is moved so that the first clip 291 can be disengaged from the first slot.

[0216] The battery compartment cover 116 has a closed state and an open state; in the closed state, the battery compartment cover 116 seals the battery compartment 1111; in the open state, the battery compartment 1111 is opened, and the battery pack 290 can be detachably inserted and removed from the battery compartment 1111 along the left and right directions.

[0217] The battery compartment cover 116 and the main body 111 can be connected by snapping, threading, or magnetic attraction. In some embodiments, one end of the battery compartment cover 116 is rotatably connected to the main body 111, and the other end of the battery compartment cover 116 is snap-connected to the main body 111. In some embodiments, one of the battery compartment cover 116 and the main body 111 is provided with a second snap 1112, and the second snap 1112 cooperates with the second slot 1161 to achieve sealing of the battery compartment 1111. In some embodiments, the battery compartment cover 116 is provided with a second slot 1161, and the main body 111 is provided with a second snap 1112. In some embodiments, the battery compartment cover 116 is snap-connected to the main body 111, and multiple snaps are arranged at intervals along the circumference of the battery compartment cover 116.

[0218] The battery compartment cover 116 is pivotally connected to the main body 111 and can rotate about a rotation axis perpendicular to the bottom surface of the housing 110. The bottom of the housing 110 has a support surface that supports the cutting machine 100 when it is placed horizontally, and the rotation axis is perpendicular to the support surface. When installing or removing the battery pack 290, the cutting machine 100 can be placed horizontally, with the support surface supporting the cutting machine 100, facilitating assembly and disassembly operations.

[0219] In some embodiments, the flip axis extends along the vertical direction of the housing 110, and the battery compartment cover 116 can be flipped forward and backward. The battery compartment cover can be located on the left or right side of the housing 110. In some embodiments, the flip axis extends along the vertical direction and is located away from the main handle 112. During the opening process, the battery compartment cover 116 flips from back to front to avoid interfering with the user's hand holding the main handle 112. Compared with other arrangements such as those in which the flip axis extends in the front-to-back direction, the battery compartment cover 116 does not need to overcome gravity when opening.

[0220] In some embodiments, the battery compartment cover 116, when in the open state, can freely rotate about the flip axis between 0 and 180 degrees relative to the closed state. In some embodiments, the battery compartment cover 116, when in the open state, can rotate about the flip axis to a predetermined angle relative to the closed state and remain at the predetermined angle, wherein the predetermined angle is greater than or equal to 90 degrees and less than or equal to 180 degrees.

[0221] In some embodiments, the battery compartment cover 116 is rotatably connected to the main body 111 via a connecting shaft 117. The connecting shaft 117 extends along the rotation axis and is connected to an elastic member 118. When the second latch 1112 disengages the second latch slot 1161, the elastic member 118 causes the battery compartment cover 116 to rotate relative to the closed position about the rotation axis to a predetermined angle and maintain the predetermined angle. The elastic member 118 may be a torsion spring that provides an ejection force to facilitate smooth opening of the battery compartment cover 116 to the predetermined angle. In some embodiments, the battery compartment cover 116 may be limited by a stopper protrusion to maintain the battery compartment cover 116 at the predetermined angle.

[0222] The inner wall of the battery compartment 1111 is provided with circuit wiring and a terminal block 320. The circuit wiring is connected to the terminal block 320, which is used to plug the terminals of the battery pack 290. When the battery pack 290 is inserted into the battery compartment 1111, the terminals of the battery pack 290 plug into the terminal block 320. The cutting machine 100 also includes a circuit cover 330, which is installed in the battery compartment 1111. The circuit cover 330 cooperates with the inner wall of the battery compartment 1111 to limit the circuit wiring and prevent it from warping.

[0223] In some embodiments, the terminal block 320 is disposed on the upper inner wall of the battery compartment 1111; the circuit wiring and circuit cover 330 is disposed on the left inner wall or the right inner wall of the battery compartment 1111, away from the battery compartment cover 116. In some embodiments, the terminal block 320 is disposed on the lower inner wall, the left inner wall, or the right inner wall of the battery compartment 1111.

[0224] In some embodiments, the bus current of the cutting machine 100 is greater than or equal to 70A, that is, the power supply current of the battery pack 290 is greater than or equal to 70A, and the cable size of the bus used by the battery pack 290 in the cutting machine 100 to supply power to the motor 120 and the circuit board assembly 180 and other components through the terminal block 320 is greater than or equal to 12AWG (American Wire Gauge). It can be understood that under the above-mentioned American Wire Gauge standard, the larger the number, the smaller the wire diameter. The bus cable size greater than or equal to 12AWG described above includes cable sizes of 10AWG, 8AWG, etc. Equivalently, the cable diameter of the bus used by the battery pack 290 in the cutting machine 100 to supply power to the motor 120 and the circuit board assembly 180 and other components (single, solid, round wire diameter) is greater than or equal to 2.053mm or greater than or equal to 0.0808inch. In some embodiments, the bus current of the cutting machine 100 is greater than or equal to 80A, and the bus cable size in the cutting machine 100 is greater than or equal to 10AWG, that is, the bus cable diameter is greater than or equal to 2.588mm or 0.1019inch; thereby adapting to the high-power working conditions of the cutting machine 100 and providing better current conduction capability and heat dissipation effect.

[0225] In some embodiments, the cutting machine 100 weighs between 6.0 kg and 7.5 kg when including the battery pack 290 , and weighs between 4.5 kg and 5.5 kg when not including the battery pack 290 .

[0226] In some embodiments, the weight of the battery pack 290 is 1.0 kg to 2.0 kg. When the output voltage of the battery pack 290 is 18 V, the output current is 60 A to 155 A; when the output voltage of the battery pack 290 is 24 V, the output current is 55 A to 130 A.

[0227] In some embodiments, the dimensions of the battery compartment 1111 are: 90 mm to 130 mm in the vertical direction of the housing 110, 90 mm to 130 mm in the front-to-back direction of the housing 110, and 140 mm to 170 mm in the left-to-right direction of the housing 110. The dimensions of the battery compartment 1111 are its inner dimensions.

[0228] In some embodiments, the output power of the motor 120 is 1.2 kW to 2.4 kW. In some embodiments, the output power of the motor 120 is 1.4 kW to 2.0 kW.

[0229] The cutting machine 100 also includes a liquid cooling system 210, which sprays coolant onto the saw blade 150 when the saw blade 150 is cutting; the liquid cooling system 210 includes a transmission pipe 211 for transmitting coolant. In some embodiments, the transmission pipe 211 and the projection of the battery compartment cover 116 in the left and right directions do not overlap, so as to avoid the arrangement of the transmission pipe 211 affecting the opening or closing of the battery compartment cover 116.

[0230] In some embodiments, the water inlet of the transmission tube 211 is set on the rear side of the grip portion, and the transmission tube 211 extends from the back to the front at the lower part of the housing 110 and avoids the battery compartment cover 116 to prevent interference with the opening or closing of the battery compartment cover 116.

[0231] The battery pack 290 is provided with a display element 292 for displaying status information of the battery pack 290. The housing 110 has a transparent portion 119, which corresponds to the position of the display element 292. The status information displayed by the display element 292 can be observed through the transparent portion 119. The operator can intuitively observe the status information.

[0232] In some embodiments, a window is defined in the housing 110, and a transparent cover is provided over the window to form the transparent portion 119. In some embodiments, the transparent portion 119 is detachably connected to the housing 110 for easy replacement and cleaning. The transparent portion 119 and the housing 110 may be connected by snaps, screws, or magnets.

[0233] In some embodiments, the indicator 292 displays at least the remaining charge of the battery pack 290. In some embodiments, the indicator 292 is an indicator light indicating the remaining charge of the battery pack 290. In some embodiments, the indicator 292 is a display screen. The indicator 292 can display numbers to accurately indicate the percentage of charge remaining in the battery pack 290. The indicator 292 can also display a range of charge remaining by changing color. In some embodiments, green indicates sufficient charge, orange indicates insufficient charge, and red indicates a very low charge.

[0234] The housing 110 includes a main body 111, a grip, and a battery compartment cover 116. The grip is at least partially located behind the main body 111, and the battery compartment cover 116 seals the battery compartment 1111. A transparent portion 119 is located on the main body 111, and / or the transparent portion 119 is located on the battery compartment cover 116. In some embodiments, the transparent portion 119 is located on the upper rear side of the main body 111 and in front of the grip. Even if a user grips the grip, the transparent portion 119 is not obscured, thus facilitating user observation.

[0235] The housing 110 is provided with a first operating member 340, which is operated by the user to cause the prompt member 292 to display status information. When the first operating member 340 is activated, the prompt member 292 displays the status information. When the first operating member 340 is not activated, the prompt member 292 does not display the status information to conserve power. The first operating member 340 is operable by the user and can be pressed, moved, or rotated by the user.

[0236] In some embodiments, when the first operating element 340 is triggered, the prompt element 292 displays status information. After the status information is displayed for a first set time period, the prompt element 292 stops displaying the status information. When the prompt element 292 is a remaining battery indicator, when the first operating element 340 is triggered, the remaining battery indicator lights up. After the remaining battery indicator lights up for the first set time period, the remaining battery indicator turns off.

[0237] The outer shell of the battery pack 290 also includes a second operating member 293 that the user can operate to cause the prompt member 292 to display status information. The second operating member 293 is connected to the first operating member 340. When the user operates the first operating member 340 from the outside, the first operating member 340 acts on the second operating member 293, causing the prompt member 292 to display status information, thereby partially utilizing the original information display function of the battery pack 290.

[0238] In some embodiments, the first operating member 340 is disposed on the battery compartment cover 116. When the battery compartment cover 116 is closed, the first operating member 340 is connected to the second operating member 293 via a rod-shaped member, so that when a user presses the first operating member 340, the second operating member 293 is pressed to display the battery level. In some embodiments, the first operating member 340 is elastically connected to the housing 110 to facilitate pressing the first operating member 340.

[0239] In some embodiments, reference Figures 26 to 28 Alternatively, a battery reminder 1191 may be directly provided on the housing 110 to display the status information of the battery pack 290 without the need to observe the battery pack 290 through a transparent window. The battery reminder 1191 may at least display the remaining power information of the battery pack 290, and further, may also display various fault warning information of the battery pack 290. The battery reminder 1191 may use components including but not limited to a remaining power indicator light and a display screen to realize information display. In some embodiments, the battery reminder 1191 also has an operating portion 1192 such as a button, a key, or a touch screen. In response to the user pressing or clicking on the operating portion 1192, the battery reminder 1191 can display status information such as the remaining power. In some embodiments, the above-mentioned battery reminder 1191 may be provided at the rear end of the main body 111 of the housing 110 and the front side of the grip portion to facilitate user observation; of course, it may also be provided at other locations.

[0240] like Figure 28 As shown, the battery reminder 1191 includes an operating part 1192 and a prompt part 1194 arranged on the housing 110, and also includes a sub-circuit board 1193 arranged in the housing 110. The sub-circuit board 1193 can be electrically connected to the above-mentioned operating part 1192, prompt part 1194 of the battery reminder 1191 and the main circuit board 181 of the cutting machine 100 described above. When the operating part 1192 is operated by the user, the activation signal will be transmitted to the sub-circuit board 1193. In response to the signal, the sub-circuit board 1193 obtains status information of the battery pack 290 such as the remaining power information from the circuit board 181 and correspondingly triggers the prompt part 1194 to display corresponding information. For example, depending on the remaining power, a corresponding number of reminder lights will be lit or the corresponding power value will be displayed, and a red light will be turned on or flashed to warn of overtemperature, undercurrent, low power, etc. The operating part 1192 and the prompt part 1194 can be embedded in the upper rear end of the main body 111 of the casing 110 and the front side of the main handle 112. The sub-circuit board 1193 can be set on the back side of the location of the operating part 1192 and the prompt part 1194. The sub-circuit board 1193 and the circuit board 181 can be electrically connected by a flat cable, and the flat cable can be attached to and fixed on the inner wall of the casing 110.

[0241] See also Figure 33 、 Figure 34 In order to facilitate user storage or work break and to hang for draining, the cutting machine 100 also includes a hook assembly 410, through which the cutting machine 100 can be stably hung in a substantially vertical posture on one or more supporting points, including but not limited to hanging on a wall, box, or cabinet. In some embodiments, such as Figure 33 As shown, the hook assembly 410 can be disposed on the bottom surface or side surface of the main body 111 of the housing 110 of the cutting machine 100, for example, on the bottom surface of the battery compartment 1111. In other embodiments, the hook assembly 410 can also be disposed near the main handle 112 of the housing 110, including at the rear end of the main handle 112 or on the bottom surface of the main handle 112. Of course, the possibility of locating the hook assembly 410 at other locations on the housing 110 of the cutting machine 100 is not ruled out. In some embodiments, the hook assembly 410 is disposed at a higher portion of the bottom surface of the housing 110 in the vertical direction. In other embodiments, the housing 110 where the hook assembly 410 is mounted can also have an inwardly facing receiving slot, with the hook body 411 and mounting member 412 disposed within the slot, thereby preventing the hook assembly 410 from affecting the horizontal stability of the cutting machine 100.

[0242] In some embodiments, the hook assembly 410 can have a storage state and a hanging state. The hook assembly 410 can include a hook body 411 and a mounting member 412. The hook body 411 can be installed on the casing 110 of the cutting machine 100 through the mounting member 412. The mounting member 412 can be fixedly connected to the casing 110, and the hook body 411 can be rotatably connected to the mounting member 412. In the storage state and the hanging state, the above-mentioned hook body 411 can be connected to the mounting member 412 at different angles so that the cutting machine 100 can be in different postures relative to the hook body 411.

[0243] In some embodiments, the hook body 411 can be turned at least 90 degrees in the hanging state compared to the storage state. Figure 33 、 Figure 34 For example, the hook body 411 and the mounting part 412 are attached to the bottom surface of the battery compartment 1111 which is higher than the bottom surface of other housings 100. The rotation axis of the hook body 411 rotating around the mounting part 412 is basically parallel to the bottom surface of the battery compartment 1111, for example, extending in the front-to-back direction or the left-to-right direction. The plane where the hook body 411 is located and the suspended body can be extended is basically parallel to the bottom surface of the battery compartment 1111 when stored, and can be flipped about 90° when hung, and the surface is basically perpendicular to the bottom surface of the battery compartment 1111. When stored, the surface where the hook body 411 is located and the bottom surface of the housing 110 are basically parallel to the ground. When hung, the surface where the hook body 411 is located can be basically parallel to the ground or basically perpendicular to the ground due to the different extension directions of the rotation axis. Alternatively, the hook assembly 410 can be disposed at the rear end or lower bottom of the main handle 112, and the hook body 411 can be rotated approximately 90° or 180° when hung. When rotated 180°, the surface of the hook body 411 can be substantially parallel to the bottom surface of the housing 110 of the cutting machine 100 when stored or hung. In some embodiments, similar to the battery compartment cover 116 described above, the hook assembly 410 can also include a torsion spring or other components to ensure that the hook body 411 can maintain a predetermined angle after being rotated.

[0244] It can be understood that the technical solutions described in the above embodiments can be freely combined without contradiction.

[0245] The above shows and describes the basic principles, main features and advantages of this application. Those skilled in the art should understand that the above embodiments do not limit this application in any form, and any technical solutions obtained by equivalent replacement or equivalent transformation fall within the scope of protection of this application.

Claims

1. A cutting machine comprising: chassis; a motor having a motor shaft; Output shaft, used to mount and drive the saw blade; a transmission assembly for transmitting power between the motor shaft and the output shaft; Characterized in that the cutting machine also includes: A circuit board assembly, comprising a circuit board and a heat sink, wherein the circuit board is connected to the heat sink; The housing has an opening, and the heat sink is at least partially exposed relative to the housing through the opening.

2. The cutting machine according to claim 1, characterized in that The cutting machine further includes a heat conducting member connected to the housing. The heat conducting member is at least partially located outside the housing. The heat dissipating member is at least partially in thermal contact with the heat conducting member through the opening.

3. The cutting machine according to claim 2, characterized in that The opening is located on the front bottom surface of the housing. The heat conducting member is connected to the housing around the opening and has a heat conducting plane covering the opening. The heat dissipating member is attached to the heat conducting member through the heat conducting plane.

4. The cutting machine according to claim 2, characterized in that The cutting machine further comprises a liquid cooling system, which sprays cooling liquid onto the saw blade when the cutting machine is cutting. The cooling liquid moves through the heat conducting member after leaving the saw blade.

5. The cutting machine according to claim 2, characterized in that The cutting machine further comprises a sealing member, which is arranged around the opening and fills the gaps between the housing, the heat dissipating member and the heat conducting member.

6. The cutting machine according to claim 2, characterized in that The heat conducting member is a wear-resistant metal member.

7. The cutting machine according to claim 1, characterized in that The heat sink is a heat dissipation box. A side of the heat dissipation box away from the circuit board has a plurality of heat dissipation through holes. The heat dissipation through holes penetrate the box body of the heat dissipation box in a direction substantially parallel to the plane where the circuit board is located.

8. The cutting machine according to claim 7, characterized in that The cutting machine also includes a fan, which is installed on the motor shaft. The housing has an air inlet and an air outlet. The heat dissipation airflow enters the housing from the air inlet and flows through the circuit board assembly and the motor in sequence, and is blown out from the air outlet.

9. The cutting machine according to claim 8, characterized in that The cutting machine also includes an air guide plate, which is connected to the casing and located inside the casing. The casing, air guide plate and heat dissipation box form a first air flow channel between the air inlet and the heat dissipation through-hole. After the heat dissipation airflow enters the casing from the air inlet, it passes through the first air flow channel and the heat dissipation through-hole in sequence.

10. The cutting machine according to claim 8, characterized in that The motor has a motor housing, and the machine housing and the motor housing form a second airflow channel between the motor and the air outlet. The heat dissipation airflow flows through the motor in the motor housing and then is blown out from the air outlet through the second airflow channel.

11. The cutting machine according to claim 9 or 10, characterized in that: The first air flow channel is substantially sealed between the air inlet and the heat dissipation through hole, and / or the second air flow channel is substantially sealed between the motor and the air outlet.

12. The cutting machine according to claim 7, characterized in that The heat dissipation box is located below the motor, and the projections of the heat dissipation box and the motor in the vertical direction at least partially overlap. The heat dissipation airflow passes through the heat dissipation through-holes and then enters the motor housing through the inner cavity of the housing.

13. The cutting machine according to claim 1, characterized in that The cutting machine further includes a battery pack, which supplies power to at least the motor; the housing includes a main body and a battery compartment cover, a battery compartment is formed inside the main body, and the battery compartment cover has a closed state and an open state; In the closed state, the battery compartment cover seals the battery compartment; in the open state, the battery pack can be detachably inserted into and removed from the battery compartment in the left and right directions.

14. The cutting machine according to claim 2, characterized in that The cutting machine also includes a second housing, which is connected to the housing and located outside the housing, and the transmission assembly is at least partially located inside the second housing; the central axis of the second housing is obliquely intersected with the support surface that supports the cutting machine when the cutting machine is placed horizontally.

15. The cutting machine according to claim 14, characterized in that The heat sink, the heat conductor, the second housing and the saw blade are all made of conductive materials. Static electricity generated during the cutting process is transferred to the saw blade through the heat sink, the heat conductor and the second housing and then released to the ground.

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