An electric tool

Abstract

The invention discloses an electric tool, comprising a base; a workbench is arranged on the base, and a support seat is arranged at the rear end of the workbench; a cutting device comprises a machine head, a guide rail assembly and a cutting assembly, and the machine head is swingably connected to the support seat; a locking mechanism comprises a locking disk, a locking block, a locking pin, a transmission mechanism, a linkage mechanism and a locking switch, one end of the locking disk is fixedly connected to the support seat, a accommodating hole is arranged in the machine head, an elastic member is arranged in the accommodating hole, the locking pin is linked with the transmission mechanism through a linkage mechanism, the locking disk is provided with a plurality of locking holes with specific angles, the locking switch is connected to the locking block through the transmission mechanism, and when the locking switch swings back and forth, the locking and unlocking of the workbench and the cutting device at any angle is realized, and at the same time, the automatic locking and unlocking of the cutting device and the workbench at a specific angle can be realized. Through the above-mentioned arrangement, the functions of the invention are more diverse, the operation is more convenient, and the locking precision is high and the locking effect is good.

Description

Technical Field

[0001] The present invention relates to the technical field of electric tools, and in particular to an electric tool. Background Art

[0002] Miter saws mainly use high-speed rotating saw blades to effectively cut various materials, such as metal, wood, plastic, etc. The inclined design of the saw blade allows the sawdust generated during the cutting process to be discharged smoothly, thus ensuring cutting efficiency and quality.

[0003] The existing miter saw includes a base, a workbench arranged on the base, and a cutting device located above the workbench. A support seat is arranged at the rear end of the workbench. The cutting device includes a head swingably connected to the support seat, a guide rail assembly slidably arranged on the head, a connecting piece connected to the front end of the guide rail assembly, and a cutting assembly pivotally connected to the connecting piece. The head of the cutting device needs to be locked after swinging relative to the support seat. In the prior art, the head locking structure of the cutting device is relatively complex, and the locking method is relatively single, which affects the user experience. In addition, the existing miter saw also has the following disadvantages: 1. When the cutting device swings back upward from the lowered position, the power cord of the cutting device is easily accidentally clamped; 2. After the extension plate slides to the top of the extension table, the gap between the extension table and the extension table is large. When cutting a thin workpiece, the workpiece is easily pushed into the gap between the extension table and the extension plate, thereby causing the workpiece to tilt and affecting the cutting accuracy; 3. The dust collection effect of the existing miter saw is relatively general. Summary of the invention

[0004] The purpose of the present invention is to provide an electric tool, which can adjust the head of the tool to a specific angle and an arbitrary angle by using the same locking switch, and has convenient and quick operation and good locking effect.

[0005] The above technical objectives of the present invention are achieved through the following technical solutions: an electric tool, comprising a base, a workbench arranged on the base, and a cutting device arranged above the workbench, a support seat is arranged at the rear end of the workbench, the cutting device comprises a head rotatably connected to the support seat, a guide rail assembly slidably arranged on the head front and back, and a cutting assembly rotatably connected to the front end of the guide rail assembly, and also comprises a locking mechanism, the locking mechanism comprises a locking disk, a locking block, a locking pin, a transmission mechanism, a linkage mechanism and a locking switch, the locking disk is arranged between the support seat and the head and fixedly connected to the support seat, the locking disk is provided with a plurality of locks arranged at intervals and having specific angles A fixed hole is provided in the machine head with a accommodating hole for the locking pin to extend and retract forward and backward, and an elastic member is provided in the accommodating hole to drive the locking pin to move in the direction of inserting into the locking hole. The rear end of the locking pin is linked with the transmission mechanism through a linkage mechanism, and the locking switch is connected to the locking block through the transmission mechanism. When the locking switch swings back and forth, the locking block is driven by the transmission mechanism to move back and forth between the clamping locking disk position and the release locking disk position, thereby realizing the locking and unlocking of the workbench and the cutting device at any angle. The locking pin cooperates with the linkage mechanism and the elastic member to move back and forth between the insertion locking hole position or the disengagement locking hole position, thereby realizing automatic locking and unlocking of the workbench and the cutting device at a specific angle.

[0006] Furthermore, the locking switch can be switched between a first position, a second position and a third position, the second position being between the first position and the third position, and when the locking switch is continuously pressed to the first position, the workbench and the cutting device are in an unlocked state, and at this time the cutting device can be swung at any angle relative to the workbench; after releasing the locking switch pressed to the first position, when the operator swings the cutting device (30) to a desired specific angle, the locking pin can be automatically inserted into a locking hole of the locking disk opposite to it under the action of the elastic member, and at this time the cutting device and the workbench are automatically locked at a specific angle; when the locking switch is pressed to the third position, the locking block moves to the position of clamping the locking disk, and at this time the cutting device and the workbench are locked as a whole through the locking cooperation of the locking block and the locking disk.

[0007] Furthermore, the transmission mechanism includes a rotating shaft, a first bevel gear, a second bevel gear, and a screw. The rotating shaft is rotatably arranged in the machine head, the locking switch is fixedly connected to the end of the rotating shaft, the first bevel gear is fixedly connected to the rotating shaft, the screw is arranged along the front and rear directions and passes through the locking plate, the locking plate is provided with an arc-shaped avoidance groove for the screw to swing left and right, the second bevel gear is fixedly connected to the screw and meshes with the first bevel gear for transmission, the front end of the screw is threadedly connected to the locking block, the locking block is matched with the support seat to stop rotation, and when the locking switch swings, it will drive the screw to drive the locking block to move between the clamping locking plate position and the loosening locking plate position, thereby realizing the locking and unlocking of the machine head and the support seat.

[0008] Furthermore, the support seat is provided with a limiting protrusion, and a movable space for the locking block to move forward and backward is formed between the limiting protrusion and the locking plate. The locking block is limited by the limiting protrusion to prevent the locking block from being separated from the screw.

[0009] Furthermore, the linkage mechanism includes a linkage member movably mounted on the rotating shaft, a first linkage pin fixedly connected to the rotating shaft, and a second linkage pin fixedly connected to the rear end of the locking pin. The first end of the linkage member is provided with a toggle portion corresponding to the position of the first linkage pin, and the second end of the linkage member is maintained in a state of conflict with the second linkage pin. The linkage member has a tendency to rotate forward under the conflict of the second linkage pin. When the locking switch is switched to the first position, the locking pin can drive the toggle portion and the linkage member to rotate backward, thereby driving the locking pin to move to a position out of the locking hole.

[0010] Furthermore, when the locking switch is rotated from the second position to the first position, the first linkage pin can drive the toggle part to rotate downward, so that the linkage part drives the second linkage pin to move away from the locking disk until the locking pin is completely disengaged from the locking hole; when the locking switch pressed to the first position is released, the locking pin moves in the direction of the insertion locking hole under the elastic force of the elastic part, so that the second linkage pin drives the linkage part to reset, and at this time the toggle part of the linkage part drives the linkage part to reset, thereby resetting the rotating shaft and the locking switch to the second position.

[0011] Furthermore, the guide rail assembly includes a plurality of guide rods connected to the rear end of the cutting assembly and a limit block connected to the rear end of the plurality of guide rods, the machine head is provided with guide channels corresponding one to one with the guide rods, a power cord mounting seat is provided at the upper end of the limit block or the machine head, the power cord mounting seat is provided with a mounting channel with an upper opening, the power cord of the cutting assembly is installed in the mounting channel, the upper opening width of the power cord mounting seat is smaller than the outer diameter of the power cord under normal conditions, a flange is provided on the power cord, a reset spring is provided on the outer peripheral sleeve of the power cord, one end of the reset spring is abutted against the front end surface of the flange, and the other end of the reset spring is abutted against the rear end surface of the power cord mounting seat.

[0012] Furthermore, an extension platform is provided on at least one of the left and right sides of the base, and the extension platform is connected to the workbench through a guide rod. The upper end surface of the extension platform is flush with the upper end surface of the workbench, and a support seat is fixedly connected to the workbench. The support seat is provided with a support surface for supporting the workpiece, and an extension plate is laterally slidably provided in the support seat, and the extension plate can extend along the support seat to the upper end of the extension platform, and the outer end of the extension plate is provided with a limiting portion extending downward to the upper end surface of the extension platform.

[0013] Furthermore, the cutting assembly includes a cutting unit and a driving unit connected to the cutting unit, the driving unit is connected to a dust hood, the dust hood is provided with an impeller connected to the driving shaft of the driving unit, the dust hood is provided with a dust suction port and a dust outlet, the tail end of the cutting unit is provided with a debris discharge channel, the outlet of the debris discharge channel and the dust suction port can be optionally installed with a connecting pipe, when the outlet of the debris discharge channel is connected to the dust suction port through the connecting pipe, the dust outlet of the dust hood is connected to a dust storage bag; when the connecting pipe is not installed between the outlet of the debris discharge channel and the dust suction port, the outlet of the debris discharge channel is directly connected to the dust storage bag.

[0014] Furthermore, a dial is fixedly connected to the upper end of the support seat, and a pointer used in conjunction with the dial is provided on the machine head.

[0015] In summary, the present invention has the following beneficial effects:

[0016] 1. The present invention can realize the automatic locking of the cutting device and the workbench at a specific angle (common working angle) and the locking of the cutting device relative to the workbench at any position by operating the same locking switch, which has more diverse functions, more convenient operation, high locking accuracy and better locking effect;

[0017] 2. The invention realizes the function of automatically resetting the power cord backwards through the cooperation of the power cord mounting seat, the reset spring and the flange of the power cord, thereby solving the problem that the cutting unit is easily accidentally clamped when it swings back upward from the lowered position;

[0018] 3. The present invention provides a stopper at the outer end of the extension portion that is flush with the upper end of the extension platform, thereby solving the problem that when a thin workpiece (the height of the workpiece is less than the height of the gap) is cut due to the gap between the extension plate and the extension platform, the workpiece adjacent to the extension platform is prone to tilt backwards, thereby causing the entire workpiece to tilt and affecting the cutting accuracy;

[0019] 4. The present invention installs an impeller on the motor shaft of the driving unit to generate huge suction, thereby sucking debris and dust such as wood chips and plastic chips generated in the cutting process into the dust bag, greatly improving the dust removal efficiency and achieving a very good dust suction effect; when cutting metal, the connecting pipe between the outlet of the debris discharge channel and the dust suction port can be removed to prevent metal debris from damaging the impeller blades. At this time, the outlet of the debris discharge channel is directly connected to the dust storage bag. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front structural schematic diagram of the present invention.

[0021] Figure 2 The present invention Figure 1 Enlarged view of point A.

[0022] Figure 3 The present invention Figure 1 Enlarged view of point B.

[0023] Figure 4 It is a schematic diagram of the back structure of the present invention.

[0024] Figure 5 It is a schematic diagram of the installation position structure of the locking disk of the present invention.

[0025] Figure 6 It is a structural schematic diagram of the locking disk of the present invention.

[0026] Figure 7 It is a structural schematic diagram of the locking mechanism of the present invention.

[0027] Figure 8 It is a schematic diagram of the transmission mechanism and linkage mechanism of the present invention.

[0028] Fig. 9 It is an exploded schematic diagram of the transmission mechanism and linkage mechanism of the present invention.

[0029] In the figure: 10, base; 20, workbench; 21, support seat; 211, limit protrusion; 212, activity space; 213, dial; 22, abutment seat; 221, extension plate; 222, limit part; 30, cutting device; 31, machine head; 311, elastic member; 312, pointer; 32, guide rail assembly; 321, guide rod; 322, limit block; 33, cutting assembly; 331, cutting unit; 332, drive unit; 333, power cord; 3331, flange; 334, return spring; 335, dust cover; 3351, dust suction port; 3352, dust outlet; 336, connecting pipe; 337, debris discharge channel; 40, locking mechanism; 41, locking plate; 411, locking hole; 412, arc-shaped avoidance groove; 42, locking block; 43, locking pin; 44, transmission mechanism; 441, rotating shaft; 442, first bevel gear; 443, second bevel gear; 444, screw; 45, linkage mechanism; 451, linkage member; 4511, toggle part; 452, first linkage pin; 453, second linkage pin; 46, locking switch; 50, power cord mounting seat; 60, extension table; 61, guide rod. DETAILED DESCRIPTION

[0030] The present invention will be further described below in conjunction with the accompanying drawings.

[0031] In order to facilitate the description of the technical solution of the present invention, the following is also defined: Figure 1 The up, down, front, back, left and right indicated by the arrows in the figure. Figure 1 Take the status of the power tool in as an example.

[0032] like Figure 1-Figure 9 As shown, an electric tool, specifically a miter saw, includes a base 10, a workbench 20 arranged on the base 10, and a cutting device 30 arranged above the workbench 20. The base 10 is used to support the workbench 20. The miter saw of the present invention is stably placed on the ground or an operating plane through the base 10. The workbench 20 is rotatably connected to the base 10, that is, the workbench 20 can rotate relative to the base 10, so as to adjust the angle of the workbench 20. The rotatable arrangement of the workbench 20 and the base 10 is a prior art and will not be described in detail in the present invention.

[0033] A support seat 21 is provided at the rear end of the workbench 20. The cutting device 30 includes a head 31 rotatably connected to the support seat 21, a guide rail assembly 32 slidably provided on the head 31 forward and backward, and a cutting assembly 33 rotatably connected to the front end of the guide rail assembly 32. The head 31 is rotatably connected to the support seat 21 through a connecting shaft, that is, the head 31 can rotate left and right around the connecting shaft. Further, a dial 213 is fixedly connected to the upper end of the support seat 21, and a pointer 312 used in conjunction with the dial 213 is provided on the head 31. The dial 213 can help the operator intuitively observe the angle of the left and right swing of the cutting device 30 relative to the workbench 20. The cutting assembly 33 is connected to the guide rail assembly 32 through a connecting member. Specifically, the cutting assembly 33 is pivotally connected to the connecting member through a pivot, that is, the cutting assembly 33 can rotate up and down around the pivot.

[0034] The cutting assembly 33 includes a cutting unit 331 and a driving unit 332 connected to the cutting unit 331. The cutting unit 331 is used to realize the cutting function of the miter saw and has a circular saw blade. The driving unit 332 is used to provide a power source and can drive the cutting unit 331 to rotate within a cutting plane, thereby realizing the cutting piece to cut the workpiece placed on the workbench 20.

[0035] The electric tool of the present invention also includes a locking mechanism 40, which includes a locking disk 41, a locking block 42, a locking pin 43, a transmission mechanism 44, a linkage mechanism 45 and a locking switch 46. The locking disk 41 is also a brake disk, and the brake disk has a connecting portion and a brake portion formed at the upper end of the connecting portion. The connecting portion is fixedly connected to the support seat 21 by a fastener, and the brake portion extends upward from the support seat 21, that is, the brake portion is arranged above the support seat 21, and the locking disk 41 is arranged between the support seat 21 and the machine head 31 and is fixedly connected to the support seat 21. Specifically, the front end of the locking disk 41 is abutted against the support seat 21, and the rear end face of the locking disk 41 is abutted against the machine head 31. The locking block 42 has a locking tooth on the side facing the locking disk 41, and the locking disk 41 can be clamped with the locking disk 41 by the locking tooth to achieve locking.

[0036] A accommodating hole is provided in the machine head 31 for the locking pin 43 to extend and retract forward and backward. The accommodating hole plays a guiding and limiting role to ensure that the locking pin 43 can only extend and retract along the length direction of the accommodating hole. The locking plate 41 is provided with a plurality of locking holes 411 arranged at intervals and having a specific angle (the specific angle is a commonly used cutting angle of a miter saw). The plurality of locking holes 411 are arranged in an arc shape with the connecting axis as the center. Specifically, the positions of the locking holes 411 are all set within the path range of rotation of the locking pin 43. The angle between the connecting line formed by the center of the locking hole 411 and the center of the connecting axis and the vertical line includes but is not limited to -45°, -33.9°, -22.5°0°, 22.5°, 33.9° and 45°. Of course, other specific angles can be designed as needed.

[0037] An elastic member 311 is provided in the accommodating hole to drive the locking pin 43 to move in the direction of inserting into the locking hole 411. Specifically, a step portion is provided in the accommodating cavity, and an abutment ring is provided on the locking pin 43. The elastic member 311 is sleeved on the locking pin 43, and one end of the elastic member 311 abuts against the step portion, and the other end of the elastic member 311 abuts against the abutment ring. Through this arrangement, the locking pin 43 always has a tendency to move in the direction of inserting into the locking hole 411 under the action of the elastic member 311.

[0038] The locking pin 43 is linked with the transmission mechanism 44 through the linkage mechanism 45, and the locking switch 46 is connected to the locking block 42 through the transmission mechanism 44. When the locking switch 46 swings back and forth, the locking block 42 is driven by the transmission mechanism 44 to move back and forth between the clamping locking disk position and the release locking disk position, thereby realizing the locking and unlocking of the workbench 20 and the cutting device 30 at any angle. The locking pin 43 cooperates with the linkage mechanism 45 and the elastic member 311, and can move back and forth between the position of inserting into the locking hole 411 or the position of disengaging from the locking hole 411, thereby realizing the automatic locking and unlocking of the workbench 20 and the cutting device 30 at a specific angle.

[0039] The locking switch 46 can be switched among a first position, a second position and a third position, the second position being between the first position and the third position. In the present invention, the first position is the position where the locking switch 46 swings to the rear end, and the third position is the position where the locking switch 46 swings to the front end. When the locking switch 46 is continuously pressed to the first position, the rotating shaft 441 drives the screw 444 to rotate so that the locking block 42 moves to the releasing locking disk position. At the same time, the first linkage pin 452 on the rotating shaft 441 drives the toggle portion 4511 to rotate downward, so that the linkage member 451 drives the second linkage pin 453 to move away from the locking disk 41 until the locking pin 43 is completely disengaged from the locking hole 411. At this time, the workbench 20 and the cutting device 30 are in an unlocked state, that is, the cutting device 30 can swing at any angle relative to the workbench 20; in the releasing state, the first linkage pin 452 on the rotating shaft 441 drives the toggle portion 4511 to rotate downward, so that the linkage member 451 drives the second linkage pin 453 to move to the side away from the locking disk 41 until the locking pin 43 is completely disengaged from the locking hole 411. After the locking switch 46 is pressed to the first position, when the operator swings the cutting device 30 to the required specific angle, the locking pin 43 can be automatically inserted into the locking hole 411 of the locking disk 41 opposite to it under the action of the elastic member 311. At this time, the cutting device 30 and the workbench 20 are automatically locked at a specific angle. At the same time, the second linkage pin 453 drives the linkage member 451 to reset. At this time, the toggle portion 4511 of the linkage member 451 drives the linkage member 451 to reset, so that the rotating shaft 441 and the locking switch 46 are reset to the second position direction; when the locking switch 46 is pressed to the third position, the rotating shaft 441 drives the screw 444 to rotate, and the screw 444 drives the locking block 42 to move to the clamping locking disk position. At this time, the cutting device 30 and the workbench 20 are locked as a whole through the locking block 42 and the locking disk 41.

[0040] The present invention can realize the automatic locking of the cutting device 30 and the workbench 20 at a specific angle (common working angle) and the locking of the cutting device 30 relative to the workbench 20 at any position by operating the same locking switch 46. The functions are more diverse, the operation is more convenient, the locking precision is high, and the locking effect is good. When in use, when the user needs to swing the cutting device 30 to any position (including a position at a specific angle and a non-specific angle), the user only needs to press the locking switch 46 to the first position continuously. At this time, the cutting device 30 is in an unlocked state. The user can swing it to the desired position, and then press the locking switch 46 to the third position. At this time, the locking block 42 clamps the locking disk 41, so that the cutting device 30 and the workbench 20 are locked as a whole. When the user needs to swing the cutting device 30 to a specific position, he only needs to press the locking switch 46 to the first position continuously. At this time, the cutting device 30 is in an unlocked state. Then release the locking switch 46, and the user swings the cutting device 30 to the vicinity of the required specific angle. When the cutting device 30 is slightly swung to a certain angle until it is facing the specific angle, the locking pin 43 will be automatically inserted into the locking hole 411 facing it at this time under the action of the elastic member 311, thereby realizing the automatic locking function at a specific angle. In order to enhance the operating stability of the cutting device 30, the user can turn the locking switch 46 to the third position after the locking pin 43 is automatically locked, and lock it through the cooperation of the locking block 42 and the locking disk 41, which provides a strong guarantee for the stable operation of the machine.

[0041] The transmission mechanism 44 includes a rotating shaft 441, a first bevel gear 442, a second bevel gear 443, and a screw 444. The rotating shaft 441 is rotatably arranged in the machine head 31. In the present invention, the rotating shaft 441 is arranged along the left and right directions, the locking switch 46 is fixedly connected to the end of the rotating shaft 441, the first bevel gear 442 is fixedly connected to the rotating shaft 441, the screw 444 is arranged along the front and rear directions and passes through the locking plate 41, the locking plate 41 is provided with an arc-shaped avoidance groove 412 for the screw 444 to swing left and right, the second bevel gear 443 is fixedly connected to the screw 444 and meshes with the first bevel gear 442 for transmission, the front end of the screw 444 is threadedly connected to the locking block 42, and the locking block 42 is matched with the support seat 21 to stop rotation. When the locking switch 46 swings, it will drive the screw 444 to drive the locking block 42 to move between the clamping locking plate position and the loosening locking plate position, thereby realizing the locking and unlocking of the machine head 31 and the support seat 21. Specifically, when the rotating shaft 441 drives the screw rod 444 to rotate, the screw rod 444 drives the locking block 42 to move forward and backward, and the locking block 42 and the locking plate 41 are clamped together to achieve locking.

[0042] The support seat 21 is provided with a limiting protrusion 211, and a movable space 212 is formed between the limiting protrusion 211 and the locking plate 41 for the locking block 42 to move forward and backward. The locking block 42 is limited by the limiting protrusion 211 to prevent the locking block 42 from being separated from the screw 444. The movable space 212 is provided with a limiting anti-rotation surface, and the lower end of the locking block 42 is against the limiting anti-rotation surface, and the locking block 42 can be limited from rotating through the limiting anti-rotation surface.

[0043] The linkage mechanism 45 includes a linkage member 451 movably sleeved on the rotating shaft 441, a first linkage pin 452 fixedly connected to the rotating shaft 441, and a second linkage pin 453 fixedly connected to the rear end of the locking pin 43. The first end of the linkage member 451 is provided with a toggle portion 4511 corresponding to the position of the first linkage pin 452, and the second end of the linkage member 451 is maintained in a state of abutting against the second linkage pin 453. Specifically, the second linkage pin 453 is arranged horizontally in the left-right direction, and the second linkage pin 453 is abutted against the second linkage pin 453 of the linkage member 451. On the rear side of the end, the linkage member 451 has a tendency to rotate forward under the support of the second linkage pin 453. When the locking switch 46 is switched to the first position, the locking pin 43 can drive the toggle portion 4511 and the linkage member 451 to rotate backward, thereby driving the locking pin 43 to move to a position out of the locking hole. Specifically, the linkage member 451 and the rotating shaft 441 are clearance-matched so that when the rotating shaft 441 rotates, the linkage member 451 will not be driven to rotate synchronously. Only when the rotating shaft 441 drives the first linkage pin 452 to rotate, the linkage member 451 is driven to rotate through the first linkage pin 452.

[0044] When the locking switch 46 is rotated from the second position to the first position, the first linkage pin 452 can drive the toggle portion 4511 to rotate downward, so that the linkage member 451 drives the second linkage pin 453 to move away from the locking disk 41 until the locking pin 43 is completely disengaged from the locking hole 411; when the locking switch 46 pressed to the first position is released, the locking pin 43 moves toward the insertion direction of the locking hole 411 under the elastic force of the elastic member 311, so that the second linkage pin 453 drives the linkage member 451 to reset. At this time, the toggle portion 4511 of the linkage member 451 drives the linkage member 451 to reset, thereby resetting the rotating shaft 441 and the locking switch 46 to the second position. That is to say, no matter which position the locking switch 46 is in, the second linkage pin 453 is against the linkage member 451. When the locking switch 46 is in the third position, the first linkage pin 452 is not in contact with the toggle portion 4511. When the locking switch 46 is in the second position, the first linkage pin 452 is not in contact with the toggle portion 4511 or is just in contact with the toggle portion 4511. At this time, the locking pin 43 is in a state of being inserted into the locking hole 411. When the locking switch 46 is switched from the second position to the third position, the first linkage pin 452 will drive the toggle rod to rotate downward, so that the linkage member 451 and the second linkage pin 453 cooperate to overcome the elastic force of the elastic member 311 to completely pull the locking pin 43 out of the locking hole 411. Since the locking pin 43 is disengaged from the locking hole 411, the cutting device 30 is in an unlocked state.

[0045] The guide rail assembly 32 includes a plurality of guide rods 321 connected to the rear end of the cutting assembly 33 and a limit block 322 connected to the rear end of the plurality of guide rods 321. The machine head 31 is provided with a guide channel corresponding to the guide rods 321. The limit block 322 or the upper end of the machine head 31 is provided with a power cord mounting seat 50. The power cord mounting seat 50 is provided with a mounting channel with an upper end opening. The power cord 333 of the cutting assembly 33 is installed in the mounting channel. Under normal conditions, the upper end opening width of the power cord mounting seat 50 is smaller than the outer diameter of the power cord 333. The outer diameter of the mounting channel is larger than the outer diameter of the power cord 333. The power cord 333 is provided with a flange 3331. The outer periphery of the power cord 333 is provided with a return spring 334. One end of the return spring 334 is abutted against the front end surface of the flange 3331, and the other end of the return spring 334 is abutted against the rear end surface of the power cord mounting seat 50. The return spring 334 is inserted from the side where the power cord 333 is connected to the cutting unit 331, that is, the return spring 334 is first installed in the power cord 333 and then the power cord 333 is connected to the cutting unit 331.

[0046] The present invention realizes the function of automatic backward reset of the power cord 333 by cooperating with the power cord mounting seat 50, the reset spring 334 and the flange 3331 of the power cord 333, thereby solving the problem that the cutting unit 331 is easily accidentally clamped when swinging back upward from the lowered position.

[0047] An extension platform 60 is provided on at least one side of the base 10, and the extension platform 60 is connected to the workbench 20 by a guide rod 61. The design of the guide rod 61 allows a gap to be left between the base 10 and the extension platform 60, which is convenient for the user to grip the workpiece, and the gap between the base 10 and the extension platform 60 is far away from the saw blade, so safety accidents are not prone to occur. When processing long workpieces, due to the large length of the workpiece, the design of the extension platform 60 enables the long workpiece to be better supported during the processing. The upper end surface of the extension platform 60 is flush with the upper end surface of the workbench 20, and a support seat 22 is fixedly connected to the workbench 20. The support seat 22 is provided with a support surface for supporting the workpiece, and an extension plate 221 is laterally slidably provided in the support seat 22, and the extension plate 221 can extend along the support seat 22. Extending to the upper end of the extension platform 60, the outer end of the extension plate 221 is provided with a limiting portion 222 extending downward to the upper end surface of the extension platform 60. Specifically, the extension platform 60 is telescopically arranged on both sides of the base 10 through the guide rod 61, and the user can adjust the distance between the extension platform 60 and the base 10 as needed. The base 10 is provided with a first locking device, and the guide rod 61 is locked by the first locking device to lock the distance between the base 10 and the extension platform 60. The abutment seat 22 is provided with a second locking device, and the extension plate 221 is locked by the second locking device to lock the distance that the extension plate 221 extends out of the abutment seat 22. The first locking device and the second locking device can adopt locking pins with threaded columns. The first locking device is threadedly connected to the base 10, and the second locking device is threadedly connected to the abutment seat 22.

[0048] The present invention provides a limiting portion 222 at the outer end of the extension portion that is flush with the upper end of the extension platform 60, thereby solving the problem that when cutting a thin workpiece (the height of the workpiece is lower than the height of the gap) due to the gap between the extension plate 221 and the extension platform 60, the workpiece on the side adjacent to the extension platform 60 is prone to tilt backwards, thereby causing the entire workpiece to tilt and affecting the cutting accuracy.

[0049] A dust cover 335 is connected to the driving unit 332, and an impeller connected to the driving shaft of the driving unit 332 is arranged in the dust cover 335. The dust cover 335 is provided with a dust suction port 3351 and a dust outlet 3352. A debris discharge channel 337 is arranged at the tail end of the cutting unit 331. The outlet of the debris discharge channel 337 and the dust suction port 3351 can be optionally installed with a connecting pipe 336. When the outlet of the debris discharge channel 337 is connected to the dust suction port 3351 through the connecting pipe 336, the dust outlet 3352 of the dust cover 335 is connected to a dust storage bag; when the connecting pipe 336 is not installed between the outlet of the debris discharge channel 337 and the dust suction port 3351, the outlet of the debris discharge channel 337 is directly connected to the dust storage bag. The present invention installs an impeller on the motor shaft of the drive unit 332 to generate a huge suction force, thereby sucking debris and dust such as wood chips and plastic chips generated during the cutting process into the dust bag, greatly improving the dust removal efficiency and achieving a very good dust suction effect; when cutting metal, the connecting pipe 336 between the outlet of the debris discharge channel 337 and the dust suction port 3351 can be disassembled to prevent metal debris from damaging the impeller blades.

[0050] The above description is only a preferred embodiment of the present invention, so all equivalent changes or modifications made according to the structure, characteristics and principles described in the scope of the patent application of the present invention are included in the scope of the patent application of the present invention.

Claims

1. An electric tool, comprising a base (10), a workbench (20) arranged on the base (10), and a cutting device (30) arranged above the workbench (20), wherein a support seat (21) is arranged at the rear end of the workbench (20), and the cutting device (30) comprises a head (31) rotatably connected to the support seat (21), a guide rail assembly (32) slidably arranged on the head (31) frontward and rearward, and a cutting assembly (33) rotatably connected to the front end of the guide rail assembly (32), characterized in that: The invention also comprises a locking mechanism (40), the locking mechanism (40) comprising a locking plate (41), a locking block (42), a locking pin (43), a transmission mechanism (44), a linkage mechanism (45) and a locking switch (46), wherein the locking plate (41) is arranged between the support seat (21) and the machine head (31) and is fixedly connected to the support seat (21), the locking plate (41) is provided with a plurality of locking holes (411) arranged at intervals and having a specific angle, the machine head (31) is provided with a receiving hole for the locking pin (43) to extend forward and backward, the receiving hole is provided with an elastic member (311) for driving the locking pin (43) to move in a direction of inserting into the locking hole (411), and the rear end of the locking pin (43) is connected by a linkage mechanism. The mechanism (45) is linked with the transmission mechanism (44), and the locking switch (46) is connected to the locking block (42) through the transmission mechanism (44). When the locking switch (46) swings back and forth, the locking block (42) is driven by the transmission mechanism (44) to move back and forth between the clamping locking disk position and the loosening locking disk position, thereby realizing the locking and unlocking of the workbench (20) and the cutting device (30) at any angle. The locking pin (43) cooperates with the linkage mechanism (45) and the elastic member (311) to move back and forth between the insertion position of the locking hole and the separation position of the locking hole, thereby realizing the automatic locking and unlocking of the workbench (20) and the cutting device (30) at a specific angle. The transmission mechanism (44) comprises a rotating shaft (441), a first bevel gear (442), a second bevel gear (443), and a screw (444); the rotating shaft (441) is rotatably arranged in the machine head (31); a locking switch (46) is fixedly connected to the end of the rotating shaft (441); the first bevel gear (442) is fixedly connected to the rotating shaft (441); the screw (444) is arranged in the front-rear direction and passes through the locking plate (41); the locking plate (41) is provided with an arc for the screw (444) to swing left and right The second bevel gear (443) is fixedly connected to the screw rod (444) and meshes with the first bevel gear (442) for transmission. The front end of the screw rod (444) is threadedly connected to the locking block (42). The locking block (42) and the support seat (21) are anti-rotationally matched. When the locking switch (46) swings, it drives the screw rod (444) to drive the locking block (42) to move between a clamping locking disk position and a loosening locking disk position, thereby realizing locking and unlocking of the machine head (31) and the support seat (21); The linkage mechanism (45) comprises a linkage member (451) movably sleeved on the rotating shaft (441), a first linkage pin (452) fixedly connected to the rotating shaft (441), and a second linkage pin (453) fixedly connected to the rear end of the locking pin (43); a first end of the linkage member (451) is provided with a toggle portion (4511) corresponding to the position of the first linkage pin (452); the second end of the linkage member (451) is kept in a state of abutting against the second linkage pin (453); the linkage member (451) has a tendency to rotate forward under the abutment of the second linkage pin (453); when the locking switch (46) is switched to the first position, the locking pin (43) can drive the toggle portion (4511) and the linkage member (451) to rotate backward, thereby driving the locking pin (43) to move to a position of disengaging from the locking hole.

2. The electric tool according to claim 1, characterized in that: The locking switch (46) can be switched among a first position, a second position and a third position, wherein the second position is between the first position and the third position. When the locking switch (46) is continuously pressed to the first position, the workbench (20) and the cutting device (30) are in an unlocked state, and the cutting device (30) can swing at any angle relative to the workbench (20). After releasing the locking switch (46) pressed to the first position, when the operator swings the cutting device (30) to a desired specific angle, the locking pin (43) can be automatically inserted into the locking hole (411) of the locking disk (41) directly opposite to it under the action of the elastic member (311), and the cutting device (30) and the workbench (20) are automatically locked at a specific angle. When the locking switch (46) is pressed to the third position, the locking block (42) moves to the position of clamping the locking disk, and the cutting device (30) and the workbench (20) are locked as a whole through the locking block (42) and the locking disk (41) locking cooperation.

3. The electric tool according to claim 2, characterized in that: The support seat (21) is provided with a limiting protrusion (211), and a movable space (212) for the locking block (42) to move forward and backward is formed between the limiting protrusion (211) and the locking plate (41). The locking block (42) is limited by the limiting protrusion (211) to prevent the locking block (42) from being separated from the screw rod (444).

4. The electric tool according to claim 1, characterized in that: When the locking switch (46) is rotated from the second position to the first position, the first linkage pin (452) can drive the toggle portion (4511) to rotate downward, so that the linkage member (451) drives the second linkage pin (453) to move away from the locking disk (41) until the locking pin (43) is completely separated from the locking hole (411); when the locking switch (46) pressed to the first position is released, the locking pin (43) moves in the direction of inserting into the locking hole (411) under the elastic force of the elastic member (311), so that the second linkage pin (453) drives the linkage member (451) to reset, and at this time, the toggle portion (4511) of the linkage member (451) drives the linkage member (451) to reset, so that the rotating shaft (441) and the locking switch (46) are reset to the second position.

5. The electric tool according to claim 1, characterized in that: The guide rail assembly (32) comprises a plurality of guide rods (321) connected to the rear end of the cutting assembly (33) and a limit block (322) connected to the rear end of the plurality of guide rods (321); the machine head (31) is provided with guide channels corresponding to the guide rods (321) one by one; a power cord mounting seat (50) is provided at the upper end of the limit block (322) or the machine head (31); the power cord mounting seat (50) is provided with a mounting channel with an upper end opening; a power cord (333) of the cutting assembly (33) is mounted in the mounting channel; a flange (3331) is provided on the power cord (333); a return spring (334) is sleeved on the outer periphery of the power cord (333); one end of the return spring (334) is abutted against the front end surface of the flange (3331); and the other end of the return spring (334) is abutted against the rear end surface of the power cord mounting seat (50).

6. The electric tool according to claim 1, characterized in that: An extension platform (60) is provided on at least one of the left and right sides of the base (10); the extension platform (60) is connected to the workbench (20) via a guide rod (61); the upper end surface of the extension platform (60) is flush with the upper end surface of the workbench (20); a support seat (22) is fixedly connected to the workbench (20); the support seat (22) is provided with a support surface for supporting a workpiece; an extension plate (221) is slidably arranged in the support seat (22) transversely; the extension plate (221) can extend along the support seat (22) to the upper end of the extension platform (60); and a limiting portion (222) is provided at the outer end of the extension plate (221) and extends downward to the upper end surface of the extension platform (60).

7. The electric tool according to claim 1, characterized in that: The cutting assembly (33) comprises a cutting unit (331) and a driving unit (332) connected to the cutting unit (331); the driving unit (332) is connected to a dust cover (335); an impeller connected to a driving shaft of the driving unit (332) is arranged in the dust cover (335); the dust cover (335) is provided with a dust suction port (3351) and a dust outlet (3352); a debris discharge channel (337) is arranged at the rear end of the cutting unit (331); The outlet of the debris discharge channel (337) and the dust suction port (3351) can be optionally installed with a connecting pipe (336). When the outlet of the debris discharge channel (337) and the dust suction port (3351) are connected through the connecting pipe (336), the dust outlet (3352) of the dust removal cover (335) is connected to the dust storage bag; when the connecting pipe (336) is not installed between the outlet of the debris discharge channel (337) and the dust suction port (3351), the outlet of the debris discharge channel (337) is directly connected to the dust storage bag.

8. An electric tool according to any one of claims 1 to 7, characterized in that: The upper end of the support seat (21) is fixedly connected with a dial (213), and the machine head (31) is provided with a pointer (312) used in conjunction with the dial (213).

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