CN112109149A

CN112109149A - Handheld electric circular saw

Info

Publication number: CN112109149A
Application number: CN201910534493.XA
Authority: CN
Inventors: 王亮
Original assignee: Ningbo Liangye Electric Appliances Co ltd
Current assignee: Ningbo Liangye Electric Appliances Co ltd
Priority date: 2019-06-20
Filing date: 2019-06-20
Publication date: 2020-12-22

Abstract

The invention discloses a handheld electric circular saw, which comprises a fixed block, wherein a moving hole is formed in the side surface of the fixed block, a cavity is formed in the fixed block, the inner part of the fixed block, which is close to the bottom, the bottom of the inner wall of the cavity is fixedly connected with a first support, the upper surface of the first support is fixedly connected with a double-shaft motor, the left end of an output shaft of the double-shaft motor is fixedly connected with a first shaft, the left end of the first shaft is fixedly connected with a circular disc, the surface of the circular disc is fixedly connected with an arc-shaped block, the surface of the arc-shaped block is movably connected with a lifting plate, the inner wall of the cavity is fixedly connected with a. The invention solves the problems that the traditional handheld electric circular saw needs to continuously move the electric saw to open the wood, consumes manpower, is long in time, causes the opening size to be inconsistent due to the fact that eyes of people are easy to fatigue, influences subsequent use and is difficult to operate in a full-automatic mode through the matching use of the structures.

Description

Handheld electric circular saw

Technical Field

The invention relates to the technical field of processing equipment, in particular to a handheld electric circular saw.

Background

The electric circular saw is a tool which takes a single-phase series motor as power and then drives a circular saw blade to carry out sawing operation through a transmission mechanism, and has the characteristics of safety, reliability, high working efficiency and the like. Electric circular saw adopts and carries climbing formula appearance structure, mainly by the motor, the reducing gear box, the protection casing, adjustment mechanism and base plate, a handle, the switch, can not reconnect the plug, circle saw blade etc. and constitute, people all carry out the opening to wood with the electric saw usually, then need continuous removal electric saw to wood opening, consume the manpower, and time is long, people's eyes are tired easily and are leaded to the opening nonconformity to influence follow-up use, so people just have a rest for a while to wood opening a period, and mark with the marker pen to opening size, so just lead to work efficiency low, the operation is troublesome, we provide a handheld electric circular saw for this reason.

Disclosure of Invention

The invention aims to provide a handheld electric circular saw, which improves the traditional device and solves the problems in the background technology.

In order to achieve the purpose, the invention provides the following technical scheme: the utility model provides a hand-held type electric circular saw, includes the fixed block, the removal hole has been seted up to the side of fixed block, the cavity has been seted up to the inside that is close to the bottom on the fixed block, the bottom fixedly connected with support of cavity inner wall is one, the last fixed surface of support is connected with double-shaft motor.

The left end of an output shaft on the double-shaft motor is fixedly connected with a first shaft, the left end of the first shaft is fixedly connected with a disc, the surface of the disc is fixedly connected with an arc block, the surface of the arc block is movably connected with a lifting plate, the inner wall of the cavity is fixedly connected with a positioning rod, the lifting plate penetrates through the positioning rod and is in sliding connection with the lifting plate, the left side of the lifting plate is limited and slides on the inner wall of the cavity, the surface of the positioning rod is sleeved with a tension spring, the top of the tension spring is fixedly connected with the lower surface of the lifting plate, the bottom of the tension spring is fixedly connected with the bottom of the inner wall of the cavity, the upper surface of the lifting plate is fixedly connected with a second support, the top of the second support is fixedly connected with a cutting motor, the right end of the output shaft on the cutting motor is fixedly connected with a second shaft, the right end of the second, the right-hand member fixedly connected with axle three of output shaft on the biax motor, the right-hand member fixedly connected with transmission of axle three, the last output shaft fixedly connected with propelling movement gear of transmission, the inner wall in removal hole is seted up and is supplied propelling movement gear pivoted to lead to the groove, the inner wall sliding connection in removal hole remains to process wood, the lower surface of waiting to process wood and the surperficial swing joint of propelling movement gear and cutting piece, the last fixed surface of fixed block is connected with the handle.

Preferably, the transmission device comprises a disc shell, the right end of the third shaft is fixedly connected with the left side of the disc shell, a lock rod penetrates through and is inserted into the arc profile of the disc shell, a lantern ring is fixedly connected to the surface of the lock rod, which is close to the top of the lock rod, a pressure spring is sleeved on the surface of the lock rod, the top of the pressure spring is fixedly connected with the lower surface of the lantern ring, the bottom of the pressure spring is fixedly connected with the surface of the disc shell, a clamping plate is fixedly connected to the bottom of the lock rod, a gear is movably connected to the surface of the clamping plate, a fourth shaft is fixedly connected to the inner wall of the gear, the surface of the fourth shaft penetrates through the right side of the disc shell and rotates in a limiting manner with the disc shell, a limiting plate is fixedly connected to the inner wall of the cavity and rotates in a limiting manner with the fourth shaft, an extrusion block is, the utility model discloses a four-shaft five-end driving mechanism, including a shaft four, a cavity, a positioning plate four, a shaft five, a positioning plate two, a positioning plate six, a positioning plate two, a positioning plate six, a surface fixed connection of a shaft six, a surface of a shaft six, a propelling gear, a surface of a shaft six, a surface fixed connection of a shaft six, a positioning plate two, a positioning plate.

Preferably, the inner wall of the moving hole is fixedly connected with a fixed seat, and the inner wall of the fixed seat is rotatably connected with a pulley through a pin shaft.

Preferably, the cambered surface on the outer contour of the cambered surface block is coaxial and concentric with the disc, and the edge of the joint of the cambered surface and the disc is in arc transition.

Preferably, the left end of the lifting plate is fixedly connected with a sliding block, and a sliding groove for the sliding block to slide up and down is formed in the left side of the inner wall of the cavity.

Preferably, the right side of the fixed block is fixedly connected with a guide pipe, and the guide pipe is opposite to the moving hole.

Preferably, the upper surface of the extrusion block is an arc-shaped surface.

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

the device integrally provides support protection for the device through the fixing block, and the fixing block is conveniently lifted through the handle and is conveniently operated by hand when being used; during the use will treat that processing wood is followed right and is turned left in removing the hole and insert, and cutting device and pusher are arranged in the cavity.

The output shaft on the double-shaft motor drives the shaft I to rotate, the disc coaxially rotates along with the shaft I, the lifting plate slides up and down on the inner wall of the cavity, the lifting plate moves up and down more stably through the positioning rod, when the cambered surface block synchronously rotates along with the disc and the cambered surface on the cambered surface block is in contact with the upper surface of the lifting plate, the lifting plate is lifted after overcoming the elasticity of the tension spring, the lifting plate is positioned at the highest position for a period of time, then the surface of the disc is in contact with the lifting plate along with the rotation, and the lifting plate descends along with the elasticity of the tension spring; the second support and the cutting motor on the second support lift along with the lifter plate is synchronous, and after the cutting motor rose, the second axle on the second support drove the cutting piece and passes the inner wall that removes the hole and treat that processing wood carries out the opening operation, and after the cutting motor takes second axle and cutting piece to descend, the cutting piece breaks away from the contact with the wood of waiting to process immediately, and the cutting piece is treating processing wood and is carrying out the opening operation time, treats that processing wood keeps motionless.

And thirdly, the output shaft on the double-shaft motor drives the shaft III to rotate, and the pushing gear can intermittently rotate through the transmission of the transmission device, so that the wood to be processed intermittently moves, the interval of the openings on the wood to be processed is limited through the intermittent movement of the wood to be processed, and the precision of the interval of the openings is ensured.

By means of the cooperation of the structures, the problems that the traditional handheld electric circular saw needs to continuously move the electric saw to open the wood, manpower is consumed, long time is needed, the opening is inconsistent in size due to the fact that eyes of people are prone to fatigue, follow-up use is affected, and full-automatic operation is difficult are solved.

Drawings

FIG. 1 is a front cross-sectional view of the structure of the present invention;

FIG. 2 is a front cross-sectional view of the disc housing of the present invention;

FIG. 3 is a left side view of the cambered surface block of the present invention;

FIG. 4 is an enlarged view of the structure of FIG. 1 at A in accordance with the present invention;

fig. 5 is a left side view of the extrusion block of the present invention.

In the figure: 1-fixed block, 2-moving hole, 3-cavity, 4-support I, 5-double-shaft motor, 6-shaft I, 7-disc, 8-arc block, 9-lifting plate, 10-positioning rod, 11-tension spring, 12-support II, 13-cutting motor, 14-shaft II, 15-cutting sheet, 16-shaft III, 17-transmission device, 171-disc shell, 172-lock rod, 173-lantern ring, 174-pressure spring, 175-clamping plate, 176-gear, 177-shaft IV, 178-limit plate, 179-extrusion block, 1771-bevel gear I, 1772-bevel gear II, 1773-shaft V, 1774-positioning plate I, 1775-bevel gear III, 1776-bevel gear IV, 1777-shaft six, 18-pushing gear, 19-through groove, 20-wood to be processed, 21-handle, 22-fixing seat, 23-pulley, 24-sliding block, 25-sliding groove and 26-guide pipe.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Referring to fig. 1 to 5, the present invention provides a technical solution: a handheld electric circular saw comprises a fixed block 1, wherein the fixed block 1 is used for providing support protection for the whole device, a moving hole 2 is formed in the side face of the fixed block 1, wood 20 to be processed is inserted into the moving hole 2, a fixed seat 22 is fixedly connected to the inner wall of the moving hole 2, a pulley 23 is rotatably connected to the inner wall of the fixed seat 22 through a pin shaft, a roller 23 is used for fixed-shaft rotation on the fixed seat 22, the roller 23 is in contact with the wood to be processed, the contact area is reduced, and the wood to be processed can be pushed more quickly and conveniently; the shape of the movable hole 2 is arranged to avoid the wood to be processed from accidentally rotating when being opened; the right side of the fixed block 1 is fixedly connected with a guide pipe 26, the guide pipe 26 is opposite to the moving hole 2, the guide pipe 26 is a circular truncated cone-shaped sleeve, the end with the relatively smaller caliber faces left, and wood to be processed can be conveniently aligned to and inserted into the moving hole 2 through the arrangement of the guide pipe 26; a cavity 3 is formed in the fixed block 1 close to the bottom, a cutting device and a pushing device are arranged in the cavity 3, a first support 4 is fixedly connected to the bottom of the inner wall of the cavity 3, and a double-shaft motor 5 is fixedly connected to the upper surface of the first support 4;

the left end of the output shaft of the double-shaft motor 5 is fixedly connected with a first shaft 6, the left end of the first shaft 6 is fixedly connected with a disc 7, the output shaft on the double-shaft motor 5 drives the shaft I6 to rotate, the disc 7 rotates coaxially with the shaft I6, the surface of the disc 7 is fixedly connected with an arc surface block 8, the arc surface on the outer contour of the arc surface block 8 is coaxial and concentric with the disc 7, the edge of the joint of the arc surface and the disc 7 is in arc transition, through the arrangement that the cambered surface on the outer contour of the cambered surface block 8 is coaxial and concentric with the disc 7, the surface of the cambered surface block 8 can be kept for a period of time at the highest position when being in contact with the lower surface of the lifting plate 9 and pushing the lifting plate to the top, in the process, the cutting blade 15 can perform opening operation on wood to be processed, and the lifting plate 9 is not prone to severe shaking when being in contact with the arc-shaped block 8 through arc transition; the surface of the cambered surface block 8 is movably connected with a lifting plate 9, the left end of the lifting plate 9 is fixedly connected with a sliding block 24, the left side of the inner wall of the cavity 3 is provided with a sliding groove 25 for the sliding block 24 to slide up and down, and the sliding block 24 moves up and down in the sliding groove 25, so that the stability of the lifting plate 9 in the lifting process is further ensured; the inner wall of the cavity 3 is fixedly connected with a positioning rod 10, the lifting plate 9 is penetrated through and is in sliding connection with the lifting plate 9 by the positioning rod 10, the lifting plate 9 slides up and down on the inner wall of the cavity 3, the lifting plate 9 can move up and down more stably through the positioning rod 10, the left side of the lifting plate 9 slides in a limiting mode on the inner wall of the cavity 3, a tension spring 11 is sleeved on the surface of the positioning rod 10, when the cambered surface 8 rotates synchronously along with the disc 7 to enable the cambered surface on the cambered surface to be in contact with the upper surface of the lifting plate 9, the lifting plate 9 can be lifted after the elastic force of the tension spring 11 is overcome by the lifting plate 9, the lifting plate 9 is located at the highest position for a period of time, then along with rotation, the surface of the disc 7 is in contact with the lifting plate 9, and; the top of a tension spring 11 is fixedly connected with the lower surface of a lifting plate 9, the bottom of the tension spring 11 is fixedly connected with the bottom of the inner wall of a cavity 3, the upper surface of the lifting plate 9 is fixedly connected with a second support 12, the top of the second support 12 is fixedly connected with a cutting motor 13, the right end of an output shaft on the cutting motor 13 is fixedly connected with a second shaft 14, the right end of the second shaft 14 is fixedly connected with a cutting blade 15, the second support 12 and the cutting motor 13 on the second support are synchronously lifted along with the lifting plate 9, after the cutting motor 13 is lifted, the second shaft 14 on the second support drives the cutting blade 15 to penetrate through the inner wall of a movable hole 2 to be processed to perform opening operation on wood 20, after the cutting motor 13 drives the second shaft 14 and the cutting blade 15 to descend, the cutting blade 15 is separated from contact with the wood 20 to be processed, when the cutting blade 15 performs opening operation on the wood 20 to, the cutting motor 13 is positioned at the highest position and the height is kept unchanged; the surface of the cutting blade 15 penetrates through the inner wall of the moving hole 2 and rotates in a limiting mode on the fixing block 1, the third shaft 16 is fixedly connected to the right end of an output shaft on the double-shaft motor 5, the transmission device 17 is fixedly connected to the right end of the third shaft 16, the third shaft 16 is driven to rotate through the output shaft on the double-shaft motor 5, and the pushing gear 18 can rotate intermittently through transmission of the transmission device 17, so that the wood 20 to be processed can move intermittently, the interval of openings in the wood 20 to be processed can be limited through intermittent movement of the wood 20 to be processed, and the precision of the interval of the openings is guaranteed; the transmission device 17 comprises a disc shell 171, the right end of a shaft III 16 is fixedly connected with the left side of the disc shell 171, a lock rod 172 penetrates through the arc-shaped contour of the disc shell 171, a sleeve ring 173 is fixedly connected to the surface of the lock rod 172 close to the top of the top, a pressure spring 174 is sleeved on the surface of the lock rod 172, the top of the pressure spring 174 is fixedly connected with the lower surface of the sleeve ring 173, the bottom of the pressure spring 174 is fixedly connected with the surface of the disc shell 171, a clamping plate 175 is fixedly connected to the bottom of the lock rod 172, and a gear 176 is movably connected to the surface of the clamping plate 175; at the moment, the cutting blade 15 is opening the wood to be processed; the inner wall of the gear 176 is fixedly connected with a shaft IV 177, the surface of the shaft IV 177 penetrates through the right side of the disc shell 171 and rotates in a limiting mode with the disc shell 171, the inner wall of the cavity 3 is fixedly connected with a limiting plate 178, the limiting plate 178 is penetrated through by the shaft IV 177 and rotates in a limiting mode with the shaft IV 177, the bottom of the inner wall of the cavity 3 is fixedly connected with an extrusion block 179, the upper surface of the extrusion block 179 is an arc-shaped surface, the arc-shaped surface on the extrusion block 179 is matched with the arc-shaped surface on the outer contour of the disc shell 171, and the clamping plate 175 on the locking rod 172 can be tightly clamped with teeth on the gear 176 through the arrangement of the arc-shaped surface on the extrusion; when the end of the lock rod 172 is separated from the arc-shaped surface of the extrusion block 179, the clamping plate 175 is rapidly separated from the teeth of the gear 176 under the action of the elastic force of the pressure spring 174, at this time, the transmission process is interrupted, and the pushing gear 18 does not rotate any more; the surface of the extrusion block 179 can be connected with the end of the lock rod 172 in a sliding manner, the surface of the shaft four 177 near the right end is fixedly connected with a first conical gear 1771, the surface of the first conical gear 1771 is engaged with a second conical gear 1772, the inner wall of the second conical gear 1772 is fixedly connected with a fifth shaft 1773, the inner wall of the cavity 3 is fixedly connected with a first positioning plate 1774, the first positioning plate 1774 is penetrated by the fifth shaft 1773 and rotates in a limited manner with the fifth shaft 1773, the surface of the fifth shaft 1773 near the top is fixedly connected with a third conical gear 1775, the rear side of the third conical gear 1775 is engaged with a fourth conical gear 1776, the inner wall of the fourth conical gear 1776 is fixedly connected with a sixth shaft 1777, the inner wall of the cavity 3 is fixedly connected with a second positioning plate 1778, the second positioning plate 1778 is penetrated by the sixth shaft 1777 and rotates in a limited manner with the sixth shaft 1777, the surface of the sixth shaft 1777 near the rear end is fixedly connected with the inner wall, the clamping plate 175 on the gear plate is clamped with teeth on the gear 176, so that the gear 176 rotates along with the disc shell 171, the first conical gear 1771 on the shaft IV 177 rotates along with the first conical gear 1771, the second conical gear 1772 meshed with the first conical gear 1772 rotates, the third conical gear 1775 synchronously rotates through transmission of the shaft IV 1775, the fourth conical gear 1776 is driven to rotate, the shaft IV 1777 on the fourth conical gear 1776 drives the push gear 18 to rotate, and the wood to be processed is pushed leftwards; output shaft fixedly connected with propelling movement gear 18 on transmission 17, remove the inner wall of hole 2 and offer and supply propelling movement gear 18 pivoted to lead to groove 19, the inner wall sliding connection who removes hole 2 remains to process wood 20, will treat to process wood 20 and insert from turning left in removing hole 2 during the use, the lower surface of treating to process wood 20 and propelling movement gear 18 and cutting piece 15's surperficial swing joint, the last fixed surface of fixed block 1 is connected with handle 21, carry through handle 21 convenience to fixed block 1 and draw and carry out handheld operation when making things convenient for the use.

The working principle is as follows: when the hand-held electric circular saw is used, wood 20 to be processed is inserted into the moving hole 2 from right to left; the output shaft on the double-shaft motor 5 drives the first shaft 6 to rotate, the disc 7 rotates coaxially with the first shaft 6, the lifting plate 9 slides up and down on the inner wall of the cavity 3, the lifting plate 9 moves up and down more stably through the positioning rod 10, when the cambered surface 8 rotates synchronously with the disc 7 and the cambered surface on the cambered surface contacts with the upper surface of the lifting plate 9, the lifting plate 9 lifts the lifting plate 9 after overcoming the elasticity of the tension spring 11, the lifting plate 9 is positioned at the highest position for a period of time, then the surface of the disc 7 contacts with the lifting plate 9 along with the rotation, and the lifting plate 9 descends along with the elasticity of the tension spring 11; the second support 12 and the cutting motor 13 on the second support synchronously lift with the lifting plate 9, when the cutting motor 13 rises, the second shaft 14 on the second support drives the cutting blade 15 to pass through the inner wall of the moving hole 2 to open the wood 20 to be processed, and when the cutting motor 13 drives the second shaft 14 and the cutting blade 15 to fall, the cutting blade 15 is separated from the wood 20 to be processed, and when the cutting blade 15 opens the wood 20 to be processed, the wood 20 to be processed is kept still; the output shaft on the double-shaft motor 5 drives the shaft III 16 to rotate, and the pushing gear 18 can intermittently rotate through the transmission of the transmission device 17, so that the wood 20 to be processed can intermittently move, and the interval of the openings on the wood 20 to be processed can be limited through the intermittent movement of the wood 20 to be processed, so that the precision of the interval of the openings is ensured; through the cooperation use between the above-mentioned structure, solved traditional handheld type electric circular saw and needed continuous removal electric saw to wood opening, consumeed the manpower to time a long time, people's eyes are tired easily and are leaded to the opening nonconformity of size to influence follow-up use, and are difficult to the problem of full-automatic operation.

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

Claims

1. A hand-held electric circular saw, characterized in that: the motor comprises a fixed block (1), wherein a moving hole (2) is formed in the side surface of the fixed block (1), a cavity (3) is formed in the fixed block (1) close to the bottom, a first support (4) is fixedly connected to the bottom of the inner wall of the cavity (3), and a double-shaft motor (5) is fixedly connected to the upper surface of the first support (4);

the left end of an output shaft on the double-shaft motor (5) is fixedly connected with a first shaft (6), the left end of the first shaft (6) is fixedly connected with a disc (7), the surface of the disc (7) is fixedly connected with an arc block (8), the surface of the arc block (8) is movably connected with a lifting plate (9), the inner wall of the cavity (3) is fixedly connected with a positioning rod (10), the lifting plate (9) is penetrated through and is in sliding connection with the lifting plate (9) by the positioning rod (10), the left side of the lifting plate (9) slides on the inner wall of the cavity (3) in a limiting manner, the surface of the positioning rod (10) is sleeved with a tension spring (11), the top of the tension spring (11) is fixedly connected with the lower surface of the lifting plate (9), the bottom of the tension spring (11) is fixedly connected with the bottom of the inner wall of the cavity (3), the upper surface of the lifting plate (9), the top fixedly connected with cutting motor (13) of two (12) of support, the right-hand member fixedly connected with axle two (14) of output shaft on cutting motor (13), the right-hand member fixedly connected with cutting piece (15) of axle two (14), the inner wall of removal hole (2) is run through on the surface of cutting piece (15) and spacing rotation on fixed block (1), the right-hand member fixedly connected with axle three (16) of output shaft on biax motor (5), the right-hand member fixedly connected with transmission (17) of axle three (16), output shaft fixedly connected with propelling movement gear (18) on transmission (17), confession propelling movement gear (18) pivoted logical groove (19) have been seted up to the inner wall of removal hole (2), the inner wall sliding connection of removal hole (2) remains to process wood (20), the lower surface and the surface swing joint of propelling movement gear (18) and cutting piece (15) of waiting to process wood (20), the upper surface of the fixing block (1) is fixedly connected with a handle (21).

2. The hand-held electric circular saw of claim 1, wherein: the transmission device (17) comprises a disc shell (171), the right end of the shaft III (16) is fixedly connected with the left side of the disc shell (171), a lock rod (172) penetrates through the arc profile of the disc shell (171), a sleeve ring (173) is fixedly connected to the surface of the lock rod (172) close to the top of the top, a pressure spring (174) is sleeved on the surface of the lock rod (172), the top of the pressure spring (174) is fixedly connected with the lower surface of the sleeve ring (173), the bottom of the pressure spring (174) is fixedly connected with the surface of the disc shell (171), a clamping plate (175) is fixedly connected to the bottom of the lock rod (172), a gear (176) is movably connected to the surface of the clamping plate (175), a shaft IV (177) is fixedly connected to the inner wall of the gear (176), the surface of the shaft IV (177) penetrates through the right side of the disc shell (171) and rotates in a limiting mode with the disc shell (, the inner wall fixedly connected with limiting plate (178) of cavity (3), limiting plate (178) is run through by axle four (177) and with the spacing rotation of axle four (177), the bottom fixedly connected with of cavity (3) inner wall extrudes piece (179), the surface of extruding piece (179) can with the tip sliding connection of locking lever (172), the fixed surface that is close to the right-hand member on axle four (177) is connected with bevel gear one (1771), the surface meshing of bevel gear one (1771) has bevel gear two (1772), the inner wall fixedly connected with axle five (1773) of bevel gear two (1772), the inner wall fixedly connected with locating plate one (1774) of cavity (3), locating plate one (1774) is run through by axle five (1773) and with axle five (1773) spacing rotation, the fixed surface that is close to the top on axle five (1773) is connected with bevel gear three (1775), the rear side of the third conical gear (1775) is engaged with a fourth conical gear (1776), the inner wall of the fourth conical gear (1776) is fixedly connected with a sixth shaft (1777), the inner wall of the cavity (3) is fixedly connected with a second positioning plate (1778), the second positioning plate (1778) is penetrated by the sixth shaft (1777) and rotates in a limiting manner with the sixth shaft (1777), and the surface, close to the rear end, of the sixth shaft (1777) is fixedly connected with the inner wall of the pushing gear (18).

3. The hand-held electric circular saw of claim 1, wherein: the inner wall fixedly connected with fixing base (22) that removes hole (2), the inner wall of fixing base (22) is connected with pulley (23) through the round pin axle rotation.

4. The hand-held electric circular saw of claim 1, wherein: the cambered surface on the outer contour of the cambered surface block (8) is coaxial and concentric with the disc (7), and the edge of the joint of the cambered surface and the disc (7) is in circular arc transition.

5. The hand-held electric circular saw of claim 1, wherein: the left end fixedly connected with slider (24) of lifter plate (9), gliding spout (25) about supplying slider (24) are seted up on the left side of cavity (3) inner wall.

6. The hand-held electric circular saw of claim 1, wherein: the right side fixedly connected with stand pipe (26) of fixed block (1), stand pipe (26) just to removing hole (2).

7. The hand-held electric circular saw of claim 1, wherein: the upper surface of the extrusion block (179) is an arc-shaped surface.