CN117817767A - Cutting deviation self-reminding type electric circular saw - Google Patents

Abstract

The invention discloses a cutting offset self-reminding type electric circular saw, which relates to the technical field of electric saws and comprises a machine shell, wherein a power pack and a driving assembly are arranged in the machine shell, the output end of the driving assembly is provided with a front flange and a saw blade, the surface of the machine shell is fixedly connected with an aluminum cover, the inner wall of the aluminum cover is in sliding connection with a movable shield, an adjusting part comprises a bottom plate, the bottom plate is fixedly connected with the surface of the machine shell in a rotating way, a limiting self-reminding part comprises a guide rule, a sliding hole for the guide rule to pass through is formed in the surface of the bottom plate and is in sliding connection with the guide rule, the limiting self-reminding part is driven to move through the movement of the electric circular saw, when the cutting offset change amplitude is larger than a set value, the limiting self-reminding part can automatically remind a worker of sending light and sound, the direction adjustment or stopping operation when the offset occurs is achieved, the quality of timber cutting is improved, the phenomenon that the jump saw is overturned caused by the overlarge offset is avoided, and the use safety of the electric circular saw is improved.

Description

Cutting deviation self-reminding type electric circular saw

Technical Field

The invention relates to the technical field of electric saws, in particular to a cutting offset self-reminding type electric circular saw.

Background

The electric saw has the advantages that the time and the labor consumed by cutting materials are greatly saved, the electric saw takes electricity as power, a cutting tool for cutting timber, stones, steel and the like is provided with sharp teeth at the edge, a saw blade is generally made of tool steel and has multiple types such as round, bar-shaped, chain-shaped and the like, and the electric circular saw is a tool for driving the circular saw blade to carry out sawing operation by taking a single-phase series excitation motor as power through a transmission mechanism, and has the characteristics of reasonable structure, high working efficiency and the like.

When the electric circular saw with the automatic reminding function is used, the whole process needs to be held by a person, the electric circular saw can not be controlled by the person to keep linear movement in the pushing process, wood cutting is caused to deviate, wood does not meet the specification, even the wood cutting is sometimes excessively deviated, and the situation of bouncing or reversing is generated, so that the electric circular saw is very dangerous.

Disclosure of Invention

The invention aims to provide a cutting offset self-reminding type electric circular saw, which solves the problems in the background art.

In order to achieve the above purpose, the present invention provides the following technical solutions: a cut offset self-warning electric circular saw, comprising:

the dust collector comprises a shell, wherein a rear cover is fixedly connected to the surface of the shell, a power pack and a driving assembly are arranged in the shell, a front flange and a saw blade are arranged at the output end of the driving assembly, an aluminum cover is fixedly connected to the surface of the shell, a movable shield is slidingly connected to the inner wall of the aluminum cover, and a dust outlet pipe is fixedly communicated with the surface of the aluminum cover;

the adjusting component comprises a bottom plate, and the bottom plate is fixedly connected to the surface of the shell in a rotating way and is used for adjusting the working angle and the working depth of the electric circular saw;

the limiting self-reminding component comprises a guide ruler, a sliding hole used for the guide ruler to penetrate through and be in sliding connection with the guide ruler is formed in the surface of the bottom plate, a positioning hole used for installing a positioning screw is formed in the surface of the bottom plate, the positioning screw is in threaded connection with the positioning hole, a push rod spring is fixedly connected between the positioning screw and the bottom plate, the positioning screw is in butt joint with the guide ruler and used for limiting the offset of the electric circular saw, and reminding is sent out when the offset is overlarge.

Optionally, the adjusting part includes degree of depth regulating plate and angle regulating plate, the degree of depth regulating plate with the equal fixed connection of angle regulating plate is in the casing surface, the degree of depth regulating plate with equal sliding connection in angle regulating plate surface has angle locking handle, two angle locking handle all with the bottom plate articulates.

Optionally, spacing is from reminding the part and includes the stopper, stopper fixed connection is in guide bar lower surface, stopper fixed surface is connected with the siren, the siren sets up to the siren that can send light and sound to remind, stopper fixed surface is connected with pressure sensor, stopper surface is through spring and telescopic link fixedly connected with limiting plate, a plurality of logical grooves have been seted up on the limiting plate surface, a plurality of it is a plurality of to lead to the equal dead axle rotation in inslot to be connected with the roller.

Optionally, the casing surface is provided with the handle, the handle designs has curve and the anti-skidding line that accords with ergonomic principle, provides comfortable sense of holding and operation feel, the casing top is provided with the auxiliary handle, and the both hands operation of being convenient for has improved the security.

Optionally, the casing surface is provided with trigger, axial lock button and push rod, activity guard shield surface fixedly connected with guard shield handle.

Optionally, the front flange with transmission assembly output passes through hexagon socket head cap screw fixed connection, the casing surface is offered and is used for accomodating hexagon socket head cap screw's hole, be convenient for when changing the saw bit with hexagon socket head cap screw cooperation.

Optionally, the drive assembly includes the motor, the motor sets up inside the back cover, the inside motor output shaft that is provided with of motor, the inside gear box that is provided with of casing, the gear box is connected with output tooth axle and output shaft through deep groove ball bearing dead axle rotation, motor output shaft tip through transfer sleeve and rubber adapter sleeve with output tooth axle fixed connection, output shaft surface passes through half key fixedly connected with gear wheel, output tooth axle surface with gear wheel surface meshes, output shaft tip with hexagon socket head cap screw fixed connection.

Optionally, the movable guard shield is provided with the mating hole, the movable guard shield through the mating hole with the casing dead axle rotates to be connected, the movable guard shield inside with be provided with the guard shield torsional spring between the casing.

Compared with the prior art, the invention has the following beneficial effects:

when the saw blade moves and deflects, the limiting plate is still abutted against the side surface of the material to be processed through the action of the spring and the telescopic rod, the variable pressure is transmitted to the pressure sensor through the spring and the telescopic rod, when the variable amplitude is larger than a set value, the pressure sensor transmits a reminding signal to the alarm, the alarm emits light and sound to automatically remind a worker, the worker stops working, the condition of overlarge deflection is avoided, the qualification rate of timber cutting is improved, the phenomenon of tripping and reversing caused by overlarge deflection is avoided due to automatic reminding of cutting deflection, and the effect of using safety of the electric circular saw is improved.

According to the invention, when the saw blade is required to be replaced, a worker screws the inner hexagon screw by taking the inner hexagon spanner, and screws the inner hexagon screw by using the inner hexagon spanner to remove the limit on the front flange and the saw blade, so that the front flange and the saw blade are disassembled, the effect of replacing the saw blade without additionally searching tools is achieved, in the conventional operation and the saw blade replacement operation, the stroke of the switch trigger is limited by the push rod, so that the safety accidents caused by misoperation are avoided, the safety of the electric circular saw in the conventional operation and the saw blade replacement operation is improved, the push rod is realized in a mechanical mode, and the electric circular saw blade cutting machine is simple and reliable, and is always in a limiting state even if a fault occurs, so that the safety accidents caused by the conventional operation of the operator in an unknowing state are effectively avoided, and the wood cutting quality is improved.

According to the invention, the movable shield always protects the saw blade when the electric circular saw is in a normal state by arranging the shield torsion spring, the saw blade of the electric circular saw is limited to be exposed, and only when the bottom plate moves close to the surface of a material to be processed, the movable shield is pushed by the material to be processed so as to expose the saw blade, and the saw blade is arranged to prevent the wood to be processed from being knocked or damage to an operator in a non-operation state.

Drawings

FIG. 1 is a first perspective view of the overall structure of the present invention;

FIG. 2 is a second perspective view of the overall structure of the present invention;

FIG. 3 is a schematic view of the back plate structure of the present invention;

FIG. 4 is an enlarged view of the structure of FIG. 1A according to the present invention;

FIG. 5 is an enlarged view of the structure of FIG. 2B in accordance with the present invention;

FIG. 6 is an enlarged view of the structure of FIG. 2 at C in accordance with the present invention;

FIG. 7 is an enlarged view of the structure of FIG. 1 at D in accordance with the present invention;

FIG. 8 is a third perspective view of the overall structure of the present invention;

FIG. 9 is an overall cross-sectional view of the structure of the present invention

Fig. 10 is an enlarged view of the structure of the rubber connecting sleeve of the present invention.

In the figure: 1. a housing; 2. a trigger; 3. an aluminum cover; 4. a dust outlet pipe; 5. a shield handle; 6. a bottom plate; 7. a saw blade; 8. a movable shield; 9. a guiding ruler; 10. a limiting block; 11. a limiting plate; 12. a set screw; 13. an angle adjusting plate; 14. a rear cover; 15. an inner hexagon screw; 16. a push rod; 17. a pressure sensor; 18. a telescopic rod; 19. a spring; 20. a roller; 21. a shaft lock button; 22. an inner hexagonal wrench; 23. an alarm; 24. a depth adjusting plate; 25. a shield torsion spring; 26. an output shaft; 27. a large gear; 28. deep groove ball bearings; 29. an output gear shaft; 30. a gear box; 31. a rubber connecting sleeve; 32. a motor; 33. a driving sleeve; 34. and an output shaft of the motor.

Description of the embodiments

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

Referring to fig. 1 to 8, in this embodiment, a self-reminding type electric circular saw for cutting offset is provided, which includes:

the dust collector comprises a shell 1, wherein the surface of the shell 1 is fixedly connected with a rear cover 14, a power pack and a driving assembly are arranged in the shell 1, the output end of the driving assembly is provided with a front flange and a saw blade 7, the surface of the shell 1 is fixedly connected with an aluminum cover 3, the inner wall of the aluminum cover 3 is slidably connected with a movable shield 8, and the surface of the aluminum cover 3 is fixedly communicated with a dust outlet pipe 4;

the adjusting part comprises a bottom plate 6, and the bottom plate 6 is fixedly connected to the surface of the shell 1 in a rotating way and is used for adjusting the working angle and the depth of the electric circular saw;

the limiting self-reminding component comprises a guide ruler 9, a sliding hole used for the guide ruler 9 to penetrate through and be connected with the guide ruler in a sliding mode is formed in the surface of the bottom plate 6, a positioning hole used for installing a positioning screw 12 is formed in the surface of the bottom plate 6, the positioning screw 12 is in threaded connection with the positioning hole, a push rod spring is fixedly connected between the positioning screw 12 and the bottom plate 6, the positioning screw 12 is abutted to the guide ruler 9 and used for limiting the deviation of the electric circular saw, and reminding is automatically sent out when the deviation is overlarge.

More specifically, in the present embodiment: after the bottom plate 6 is adjusted to a proper working angle and depth by a worker through the movement of the adjusting part, the positioning screw 12 is rotated by the worker, after the guide ruler 9 is adjusted to a required length by the other hand, the guide ruler 9 is fixed by the positioning screw 12, the saw blade 7 is started to rotate, the worker holds the shell 1 to push the electric circular saw along a working plane, when the saw blade 7 moves and deflects, the limiting self-reminding part moves, when the cutting deflection change amplitude is larger than a set value, the limiting self-reminding part automatically reminds the worker by emitting light and sound, the worker adjusts the direction or stops working, the wood cutting quality is improved, the phenomenon that the jump saw caused by overlarge deflection when the worker uses is avoided, and the use safety of the electric circular saw is improved.

Further, in the present embodiment: the adjusting part comprises a depth adjusting plate 24 and an angle adjusting plate 13, wherein the depth adjusting plate 24 and the angle adjusting plate 13 are fixedly connected to the surface of the shell 1, the surfaces of the depth adjusting plate 24 and the angle adjusting plate 13 are slidably connected with angle locking handles, and the two angle locking handles are hinged to the bottom plate 6.

More specifically, in the present embodiment: the staff is through twisting angle locking handle, consults degree of depth regulating plate 24 and angle regulating plate 13, adjusts the degree of depth and the angle of bottom plate 6 respectively, can carry out accurate location to the processing surface on waiting to process the material, improves the processingquality of timber, and good measurement and the location of work angle and the work degree of depth of cutting help avoiding cutting the emergence of skew, have improved cutting quality, can reduce the jump saw or move back potential safety hazards such as saw that the skew brings of cutting.

Further, in the present embodiment: the limiting self-reminding component comprises a limiting block 10, wherein the limiting block 10 is fixedly connected to the lower surface of a guide ruler 9, an alarm 23 is fixedly connected to the surface of the limiting block 10, the alarm 23 is arranged to be an alarm capable of giving out lamplight and sound reminding, a pressure sensor 17 is fixedly connected to the surface of the limiting block 10, a limiting plate 11 is fixedly connected to the surface of the limiting block 10 through a spring 19 and a telescopic rod 18, a plurality of through grooves are formed in the surface of the limiting plate 11, and rollers 20 are fixedly connected to the inner parts of the through grooves in a rotating mode through fixed shafts.

More specifically, in the present embodiment: limiting plate 11 butt is in the side of waiting to process the material, limiting plate 11 receives the pressure of waiting to process the side butt of material, transmit pressure to pressure sensor 17 through spring 19 and telescopic link 18, paste bottom plate 6 in waiting to process the plane, the staff holds casing 1 and drives limiting plate 11 and remove along waiting to process the side of material through the roller 20 that the surface set up, when the saw bit 7 motion in-process takes place the skew, make limiting plate 11 still butt in waiting to process the side of material through the effect of spring 19 and telescopic link 18, but pressure sensor 17 receives the pressure change, pressure sensor 17 transmits the warning signal to alarm 23 when the range of variation is greater than the settlement numerical value, alarm 23 sends light and sound and reminds the staff voluntarily, make staff adjustment direction or stop the operation, the condition of skew is avoided, the qualification rate of timber cutting has been improved, the automatic warning of cutting skew has avoided the phenomenon emergence that the jump saw that the skew is too big leads to is backed up, the security of electric circular saw use has been improved.

Further, in the present embodiment: the surface of the machine shell 1 is provided with a handle which is designed with curves and anti-skid patterns conforming to the human engineering principle, comfortable holding feel and operation hand feeling are provided, and the top of the machine shell 1 is provided with an auxiliary handle.

More specifically, in the present embodiment: the design of curve and anti-skidding line that accords with ergonomic principle provides comfortable sense of gripping and operation feel for the staff, the security when having improved electric circular saw and used, the design of vice handle, be convenient for both hands operation, the staff of being convenient for controls electric circular saw, the security has been improved, handle and vice handle through staff's hand casing 1, promote electric circular saw along waiting work plane, in the direction of perpendicular to saw bit 7 place plane, the focus of electric circular saw is minimum to the distance at the center of handle and vice handle, make electric circular saw have less overall dimension, and better equilibrium, help the staff to control the direction of movement of mastering electric circular saw, and then the probability of taking place too big skew when having avoided cutting is too high, the direction of movement of control electric circular saw that can be better helps avoiding the skew, improve cutting quality, and then the qualification rate of timber cutting has been improved.

Further, in the present embodiment: the surface of the casing 1 is provided with a trigger 2, a shaft lock button 21 and a push rod 16, and the surface of the movable shield 8 is fixedly connected with a shield handle 5.

More specifically, in the present embodiment: the push rod 16 internally comprises a return spring, a worker releases the physical limit of the trigger 2 by adjusting the push rod 16, then starts a motor through the trigger 2 to drive the saw blade 7 to rotate, the worker can control the saw blade 7 to start and stop through the shaft lock button 21, the trigger 2 can select Dongke series products, the saw blade 7 is a Weida series product, when the saw blade 7 needs to be replaced, the worker starts the movable shield 8 through the shield handle 5, the movable shield 8 slides along the aluminum cover 3, in the normal operation and the operation of replacing the saw blade 7, the stroke of the switch trigger 2 is limited through the push rod 16, thereby avoiding safety accidents caused by misoperation, improving the safety of the electric circular saw in the normal operation and the operation of replacing the saw blade 7, and the push rod 16 is realized in a mechanical mode, is simple and reliable, and is always in a limiting state even if faults occur, thereby effectively avoiding the safety accidents caused by the normal operation of the operator under an unknowing state.

Further, in the present embodiment: the front flange is fixedly connected with the output end of the transmission assembly through an inner hexagon screw 15, a hole for accommodating an inner hexagon wrench 22 is formed in the surface of the machine shell 1, and the front flange is matched with the inner hexagon screw 15 when the saw blade 7 is replaced conveniently.

More specifically, in the present embodiment: when needing to change saw bit 7, the staff only need through taking allen wrench 22, twists allen screw 15 with allen wrench 22 and removes the spacing to flange and saw bit 7 before and then dismantles flange and saw bit 7, convenient and fast carries along with electric circular saw, can not lose the instrument of changing the saw bit easily, does not need additionally to look for the instrument, helps improving work efficiency.

Further, in the present embodiment: the driving assembly comprises a motor 32, the motor 32 is arranged inside the rear cover 14, a motor output shaft 34 is arranged inside the motor 32, a gear box 30 is arranged inside the machine shell 1, the gear box 30 is fixedly connected with an output gear shaft 29 and an output shaft 26 through a deep groove ball bearing 28 in a rotating mode, the end portion of the motor output shaft 34 is fixedly connected with the output gear shaft 29 through a transmission shaft sleeve 33 and a rubber connecting sleeve 31, the surface of the output shaft 26 is fixedly connected with a large gear 27 through a semicircular key, the surface of the output gear shaft 29 is meshed with the surface of the large gear 27, and the end portion of the output shaft 26 is fixedly connected with an inner hexagon screw 15.

More specifically, in the present embodiment: the motor 32 can be a macro sun 855 motor (18V circular shaft), the output gear shaft 29 is driven to rotate through the motor output shaft 34, the large gear 27 is driven to rotate through the output gear shaft 29, the output shaft 26 is driven to rotate through the large gear 27, torsional vibration and impact load between the motor output shaft 34 and the output gear shaft 29 are alleviated through the rubber connecting sleeve 31, resonance is prevented, relative offset of two axes can be compensated, the stability of the electric circular saw is improved, the vibration impact is absorbed through the arrangement of the rubber connecting sleeve 31, noise can be reduced, the axial direction is short, the design size of the electric circular saw is small, the electric circular saw is flexible and portable, and the electric circular saw is convenient to carry and operate and control, and is beneficial to preventing the occurrence of excessive offset.

Further, in the present embodiment: the movable shield 8 is provided with a matching hole, the movable shield 8 is connected with the casing 1 in a fixed shaft rotation way through the matching hole, and a shield torsion spring 25 is arranged between the inside of the movable shield 8 and the casing 1.

More specifically, in the present embodiment: through setting up guard torsion spring 25 so that electric circular saw is in the normal time, the saw bit 7 is protected all the time to movable guard 8, only when bottom plate 6 hugs closely the material surface that waits to process and removes, movable guard 8 just can with wait to process material surface looks butt, and then is promoted and expose saw bit 7, and electric circular saw's saw bit 7 is restricted to expose to avoid saw bit 7 to collide with the work piece or bring the injury for the operator under non-operational state.

Working principle: when the electric circular saw with the cutting offset self-reminding function is used, a worker can lock the handle by screwing the angle, the depth and the angle of the bottom plate 6 are adjusted by referring to the depth adjusting plate 24 and the angle adjusting plate 13, after the bottom plate 6 is adjusted to a proper working angle and depth, the positioning screw 12 is rotated by the worker, the guide ruler 9 is fixed by the positioning screw 12 after the guide ruler 9 is adjusted to a required length by the other hand, the limiting plate 11 is abutted to the side face of a material to be processed, the limiting plate 11 is subjected to pressure of the side face abutment of the material to be processed, the pressure is transmitted to the pressure sensor 17 through the spring 19 and the telescopic rod 18, the bottom plate 6 is attached to a plane to be processed, good measurement and control of the working angle and the working depth of the cutting offset are facilitated to avoid the occurrence of the cutting offset, the cutting quality is improved, and potential safety hazards such as jumping or retracting the cutting offset can be reduced.

The motor is started through the push rod 16 and the trigger 2 to drive the saw blade 7 to rotate, and in the operation of normal operation and replacement of the saw blade 7, the stroke of the switch trigger 2 is limited through the push rod 16, so that safety accidents caused by misoperation are avoided, safety of the electric circular saw in the operation of normal operation and replacement of the saw blade 7 is improved, the push rod 16 is realized in a mechanical mode, and the electric circular saw is simple and reliable, and is always in a limiting state even if faults occur, so that safety accidents caused by normal operation of an operator in an unknowing state are effectively avoided.

The staff holds the handle and the auxiliary handle of casing 1, promotes electric circular saw bottom plate 6 along waiting work plane, in the planar direction of perpendicular to saw bit 7 place, the focus of electric circular saw is minimum to the distance in the center of handle and auxiliary handle for electric circular saw has less overall dimension, and better equilibrium, helps the staff to control and masters the direction of motion of electric circular saw, and then has avoided cutting offset probability too high, and the direction of motion of control electric circular saw that can be better helps avoiding the emergence of skew improves cutting quality.

When the electric circular saw is in a normal state, the movable shield 8 always protects the saw blade 7, the saw blade 7 of the electric circular saw is limited to be exposed, the movable shield 8 is abutted to the material to be processed only when the bottom plate 6 is tightly attached to the surface of the material to be processed to move, then the movable part is pushed by the material to be processed to expose the saw blade 7, and the movable shield 8 is arranged to prevent the saw blade 7 from suddenly rotating in a non-working state, so that the saw blade 7 collides with a workpiece or hurts workers.

Through the staff holding electric circular saw handle and remove, drive limiting plate 11 through the roller 20 that the surface set up along the side of waiting to process the material and remove, when saw bit 7 motion in-process takes place the skew, make limiting plate 11 still butt in waiting to process the side of material through the effect of spring 19 and telescopic link 18, but pressure sensor 17 receives pressure change, pressure sensor 17 gives alarm 23 with the warning signal transmission when the range of variation is greater than the settlement numerical value, alarm 23 sends light and sound and carries out automatic warning to the staff, make staff adjustment direction or stop the operation, the quality of timber cutting has been improved, and then the qualification rate of timber cutting is promoted, the automatic warning of cutting skew has avoided the phenomenon emergence that the jump saw that the skew was too big to lead to was in the back, the security of electric circular saw use has been improved.

Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. A cutting offset self-warning electric circular saw, comprising:

the dust removing device comprises a shell (1), wherein a rear cover (14) is fixedly connected to the surface of the shell (1), a power pack and a driving assembly are arranged in the shell (1), a front flange and a saw blade (7) are arranged at the output end of the driving assembly, an aluminum cover (3) is fixedly connected to the surface of the shell (1), a movable shield (8) is slidably connected to the inner wall of the aluminum cover (3), and a dust outlet pipe (4) is fixedly communicated with the surface of the aluminum cover (3);

the adjusting component comprises a bottom plate (6), and the bottom plate (6) is fixedly connected to the surface of the shell (1) in a rotating way and is used for adjusting the working angle and the working depth of the electric circular saw;

spacing is from reminding the part, spacing is from reminding the part including guiding ruler (9), be used for guiding ruler (9) pass and sliding connection's slide hole with it is offered to bottom plate (6) surface, the locating hole that is used for installing set screw (12) is offered on bottom plate (6) surface, set screw (12) with locating hole threaded connection, set screw (12) with fixedly connected with push rod spring between bottom plate (6), set screw (12) with guiding ruler (9) butt for restrict the skew of electric circular saw, and send automatically when the skew is too big and remind.

2. The cut offset self-warning electric circular saw of claim 1, wherein: the adjusting part comprises a depth adjusting plate (24) and an angle adjusting plate (13), wherein the depth adjusting plate (24) and the angle adjusting plate (13) are fixedly connected to the surface of the casing (1), the depth adjusting plate (24) and the surface of the angle adjusting plate (13) are slidably connected with angle locking handles, and the two angle locking handles are hinged to the bottom plate (6).

3. The cut offset self-warning electric circular saw of claim 2, wherein: the limiting self-reminding component comprises a limiting block (10), the limiting block (10) is fixedly connected with the lower surface of the guide ruler (9), an alarm (23) is fixedly connected with the surface of the limiting block (10), the alarm (23) is arranged to be an alarm capable of giving out lamplight and sound reminding, a pressure sensor (17) is fixedly connected with the surface of the limiting block (10), a limiting plate (11) is fixedly connected with the surface of the limiting block (10) through a spring (19) and a telescopic rod (18), a plurality of through grooves are formed in the surface of the limiting plate (11), and a plurality of rollers (20) are rotatably connected to the inner fixed shafts of the through grooves.

4. The cut offset self-warning electric circular saw of claim 3, wherein: the novel hand-held electric bicycle is characterized in that the grip is arranged on the surface of the casing (1), curves and anti-skidding patterns which accord with the principle of ergonomics are designed on the grip, comfortable holding feeling and operation hand feeling are provided, and the auxiliary grip is arranged at the top of the casing (1), so that the double-hand operation is facilitated, and the safety is improved.

5. The self-warning electric circular saw of claim 4, wherein: the surface of the shell (1) is provided with a trigger (2), a shaft lock button (21) and a push rod (16), and the surface of the movable shield (8) is fixedly connected with a shield handle (5).

6. The cut offset self-warning electric circular saw of claim 5, wherein: the front flange is fixedly connected with the output end of the driving assembly through an inner hexagon screw (15), a hole for accommodating an inner hexagon wrench (22) is formed in the surface of the machine shell (1), and the inner hexagon screw (15) is matched with the machine shell when the saw blade (7) is replaced conveniently.

7. The cut offset self-warning electric circular saw of claim 6, wherein: the driving assembly comprises a motor (32), the motor (32) is arranged inside the rear cover (14), a motor output shaft (34) is arranged inside the motor (32), a gear box (30) is arranged inside the machine shell (1), the gear box (30) is fixedly connected with an output gear shaft (29) and an output shaft (26) through a deep groove ball bearing (28) in a rotating mode, the end portion of the motor output shaft (34) is fixedly connected with the output gear shaft (29) through a driving shaft sleeve (33) and a rubber connecting sleeve (31), a large gear (27) is fixedly connected to the surface of the output shaft (26) through a semicircular key, the surface of the output gear shaft (29) is meshed with the surface of the large gear (27), and the end portion of the output shaft (26) is fixedly connected with an inner hexagon screw (15).

8. The cut offset self-warning electric circular saw of claim 6, wherein: the movable shield (8) is provided with a matching hole, the movable shield (8) is connected with the shell (1) through the matching hole in a fixed shaft rotating way, and a shield torsion spring (25) is arranged between the inside of the movable shield (8) and the shell (1).