CN220717938U

CN220717938U - Saw blade protection mechanism for metal circular sawing machine

Info

Publication number: CN220717938U
Application number: CN202322250903.2U
Authority: CN
Inventors: 吕雄辉; 王敏剑
Original assignee: Zhejiang Zhongyide Intelligent Equipment Co ltd
Current assignee: Zhejiang Zhongyide Intelligent Equipment Co ltd
Priority date: 2023-08-22
Filing date: 2023-08-22
Publication date: 2024-04-05
Anticipated expiration: 2033-08-22

Abstract

The utility model discloses a saw blade protection mechanism for a metal circular sawing machine, which relates to the technical field of circular sawing machine protection and comprises a gearbox, a saw blade mounting unit and a saw blade protection unit; the gearbox is a square box body, and a chamfer is formed at the position of the horizontal edge; the saw blade mounting unit is arranged at the left side of the gearbox; saw bit protection unit connecting rod, last protective housing, inferior valve shell, lock connect hole and mortise lock piece, the left side of gearbox is by the position department fixedly connected with two horizontal connecting rods, the one end fixed connection that the gearbox was kept away from to the connecting rod is on last protective housing's right flank. The utility model can effectively protect the circular sawing machine during use and retraction, and can also draw out a small part of the lower protective shell to cover and protect the front lower side of the saw blade in a rotating state, thereby improving the protection effect on the saw blade, and the saw blade mounting unit can effectively mount and fix the saw blade so as to ensure the mounting stability during cutting of the circular saw blade.

Description

Saw blade protection mechanism for metal circular sawing machine

Technical Field

The utility model relates to the technical field of protection of circular sawing machines, in particular to a saw blade protection mechanism for a metal circular sawing machine.

Background

The circular sawing machine is a tool for production and processing, and can be divided into a metal circular sawing machine and a woodworking circular sawing machine according to processed products; for metal circular sawing machines, the saw blade is usually made of hard steel, and sharp saw teeth are arranged on the circumference side, so that the saw blade has a great danger when rotating, and corresponding protective measures are needed;

the protection of metal circular sawing machine among the prior art to the saw bit is too simple, adopts simple a piece to protect the tile to cover more, only can carry out simple protection to the upper half of the saw bit that rotates, can't shelter from the protection to the front downside of circular rotation saw bit, and can not carry out comprehensive protection to the saw bit when the circular sawing machine receive and releases, leads to the circular sawing machine all to have personnel to touch by mistake the potential safety hazard in a plurality of scenes, in addition, current device's saw bit is not firm enough when the installation, leads to the metal circular sawing machine to have certain risk of coming off when the operation, for this reason, we propose a saw bit protection mechanism for metal circular sawing machine.

Disclosure of Invention

The utility model aims to overcome the prior art, and provides a saw blade protection mechanism for a metal circular sawing machine, which is provided with a reliable saw blade protection unit, can effectively protect the saw blade during use and retraction of the circular sawing machine, can be conveniently switched between two protection states, can also draw out a small part of lower protection shell to cover and protect the front lower side of a rotating saw blade, thereby improving the protection effect of the saw blade, is also provided with a component for separating sawing sparks, and can effectively install and fix the saw blade of the circular sawing machine so as to ensure the installation stability of the circular saw blade during rotating cutting, and can effectively solve the problems in the background art.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a saw blade protection mechanism for a metal circular sawing machine comprises a gearbox, a saw blade mounting unit and a saw blade protection unit;

a gear box: the square box body is provided with a chamfer at the position of the horizontal edge, the motor is fixedly arranged at the rear side of the gearbox, the output end of the motor is connected with a transmission part in the gearbox, and the input end of the motor is electrically connected with the output end of an external power supply through an external control switch group;

saw blade mounting unit: is arranged on the left side of the gearbox;

blade guard unit: connecting rod, last protective housing, lower protective housing, lock catch hole, installation piece and mortise lock piece, the left side of gearbox leans on last position department fixedly connected with two horizontal connecting rods, the one end fixedly connected with of gearbox is kept away from on the right flank of last protective housing to the connecting rod, it is half circle structure and at its inside nestification be provided with lower protective housing to go up the protective housing, lower protective housing sliding connection just can follow the outside pull of the front end of last protective housing in the inside of last protective housing, the equal fixedly connected with T-shaped lock catch piece in the outside of two sections around the last protective housing, the lock catch hole has been seted up upwards to the lower extreme of lock catch piece, the outside fixedly connected with square installation piece of the one end of last protective housing is stretched out to the lower protective housing, an arc mounting groove has been seted up on the front end right side of installation piece, the middle part fixedly connected with installation short piece of arc mounting groove, the inside thread connection of installation short piece has a locking bolt's of a right side of the arc bolt of the side of installing the short protective housing, the right side of the arc bolt of installing the short section and passing the side of the arc bolt.

The gearbox is used for carrying out variable speed drive with the output shaft of motor, saw bit installation unit is used for carrying out effectual installation fixedly to the saw blade, so as to ensure good cutting function, the connecting rod is used for the installation of last protective housing, lower protective housing slides and inlays the inside of establishing last protective housing, when the circular sawing machine is at the cutting during operation, can accomodate down the protective housing inside last protective housing completely, in order to keep last protective housing to protect the last half of saw blade, when the circular sawing machine is not used, can pull out the protective housing down, form a complete disc with last protective housing, form the comprehensive protection to the saw blade, the protective housing can both be effectively fixed with last protective housing when pulling out and accomodating, the installation piece is used for pegging graft fixedly with the locking piece of last protective housing front end through the upside down, when pulling out the state, the protective housing is pegged graft fixedly through the locking piece of downside to the locking piece with the locking piece of last protective housing rear end, the arc mounting groove is used for installing the threaded connection of lock bolt, the protective housing can be fixed at the right side of side through screwing down, thereby can take out the circular saw blade under the protection effect when the protection is all can be carried out to the protection to the saw blade under the protection at random, thereby the protection effect has been improved.

Further, the saw blade protection unit further comprises a locking hole and a control button, the upper end of the locking piece is provided with a circular locking hole, and the control button is arranged at the upper end of the locking block. The control button can enable the inner inserted bar to pass through the locking hole by pressing, so that the locking effect on the lower protective shell is formed.

Further, saw bit installation unit contains transmission shaft, inner clamping disk, middle part cartridge, side limit post and saw blade, the left side middle part rotation of gearbox is connected with the transmission shaft, the one end fixedly connected with of transmission shaft keeping away from the gearbox is in the right side centre of a circle position department of inner clamping disk, the left side centre of a circle position department fixedly connected with middle part cartridge of inner clamping disk, the left side eccentric position department circumference array fixedly connected with three side limit post of inner clamping disk, the saw blade is pegged graft through the mounting hole that self was seted up and is installed on middle part cartridge and side limit post. The transmission shaft is used for driving the inner clamping disc to rotate, the middle inserting shaft is used for inserting and installing the circular saw blade, and the side limiting columns penetrate through the circular saw blade from the eccentric position, so that limiting and fixing of the circular saw blade are completed, and the installation stability of the circular saw blade in rotation and cutting is guaranteed.

Further, the saw blade mounting unit further comprises an outer clamping disc and a fixing bolt, the left ends of the side limiting columns are provided with threaded holes inwards, and the outer clamping disc is clamped on the left side of the circular saw blade and is fixedly connected with the side limiting columns through the fixing bolt. The fixing bolt is used for connecting and fixing the outer clamping disc and the side limiting columns, and the outer clamping disc is matched with the inner clamping disc to clamp and fix two sides of the circular saw blade.

Further, saw bit installation unit still contains overlap joint piece and protection cushion, the equal circumference array fixedly connected with of one side that interior joint dish and outer joint dish and middle circular saw blade paste is a plurality of protection cushion, and all fixedly connected with in the centre of a circle and eccentric position department on outer joint dish right side overlap joint piece, and the size and the position level that are located the centre of a circle insert the axle correspond with the middle part, and the overlap joint piece that is located eccentric position department corresponds with the size and the position level of side spacing post, it cup joints the outside at middle part insert axle and side spacing post respectively to contain the overlap joint piece. The socket joint block is used for being inserted with the middle part inserting shaft and the side limiting columns, so that the installation of the outer clamping disc is facilitated, and the protection cushion blocks are used for protecting two sides of the circular saw blade.

Further, still include the hand rack and hold the cotton circle, the upside fixedly connected with hand rack of gearbox and motor, and the outside cover of hand rack forward one section has holds the cotton circle. The operator controls the circular sawing machine to press downwards through the hand-pulling frame, so that the metal workpiece is cut, and the hand-holding cotton ring can prevent the hands of the worker from being worn and numb due to vibration of the machine.

Further, still including installation crossbearer, spark blocking frame, collection bits box and bolt fastener, motor housing's left side fixedly connected with installation crossbearer, the one end that the motor was kept away from to the installation crossbearer passes through bolt fastener installation and is fixed with vertical spark blocking frame, spark blocking frame's both sides outwards open and have seted up tiny exhaust hole, spark blocking frame's lower extreme fixedly connected with collection bits box. The installation crossbearer is used for the installation of spark to block the frame, and the metal chip that the spark was blocked the frame and will cut the production to make the piece fall into the collection bits box of downside, in order to prevent that the high-speed high temperature spark that the metal saw cut produced from splashing, thereby improved the guard action to the saw bit, the bolt fastener is used for fixing spark to block frame and installation crossbearer, and makes the spark block frame can dismantle, in order to empty the metal chip in the collection bits box.

Compared with the prior art, the utility model has the beneficial effects that: the saw blade protection mechanism for the metal circular sawing machine has the following advantages:

1. the protection device has the advantages that the protection device is provided with a reliable saw blade protection unit, can effectively protect the circular sawing machine during use and retraction, can be conveniently switched between two protection states, and can also draw out a small part of lower protection shell to cover and protect the front lower side of the circular blade: the lower protective shell is slidably embedded in the upper protective shell, when the circular sawing machine is in cutting work, the lower protective shell can be completely contained in the upper protective shell so as to keep the upper protective shell to protect the upper half part of the circular sawing blade, and when the circular sawing machine is not in use, the lower protective shell can be pulled out to form a complete disc with the upper protective shell, so that the circular sawing blade is comprehensively protected; the locking bolt can be abutted against the right side of the lower protective shell through screwing, so that the lower protective shell can be effectively fixed when being pulled out of any angle, and a small part of the lower protective shell can be pulled out to cover and protect the front lower side of the circular blade when the circular cutting machine works;

2. the reliable saw blade mounting unit is provided, and can be used for effectively mounting and fixing the saw blade of the circular sawing machine so as to ensure the mounting stability of the circular sawing blade during rotary cutting: the transmission shaft is used for driving the inner clamping disc to rotate, the middle inserting shaft is used for inserting and installing the circular saw blade, the side limiting columns penetrate through the circular saw blade from the eccentric position, so that limiting and fixing of the circular saw blade are completed, the installation stability of the circular saw blade during rotation and cutting is ensured, the fixing bolts are used for fixedly connecting the outer clamping disc and the side limiting columns, the outer clamping disc is matched with the inner clamping disc to clamp and fix two sides of the circular saw blade, the sleeving blocks are used for inserting with the middle inserting shaft and the side limiting columns, installation of the outer clamping disc is facilitated, and the protection cushion blocks are used for protecting two sides of the circular saw blade;

3. the utility model has a reliable saw blade protection unit, can effectively protect the saw blade when the circular sawing machine is used and retracted, can be conveniently switched between two protection states, can also draw out a small part of lower protective shell to cover and protect the front lower side of the saw blade in a rotating state, thereby improving the protection effect of the saw blade, and has a component for separating sawing sparks.

Drawings

FIG. 1 is a schematic diagram of the structure of the present utility model;

FIG. 2 is a schematic view of the left lower side structure of the present utility model;

FIG. 3 is an enlarged schematic view of a portion of FIG. 2A in accordance with the present utility model;

FIG. 4 is a schematic view of the left rear side structure of the present utility model;

FIG. 5 is a schematic view of a portion of the present utility model;

FIG. 6 is a schematic view of a partial two-structure of the present utility model;

FIG. 7 is a schematic view of the left side structure of the present utility model

Fig. 8 is an enlarged partial schematic view of the utility model at B in fig. 1.

In the figure: the novel three-dimensional saw blade comprises a gearbox 1, a motor 2, a saw blade mounting unit 3, a transmission shaft 31, an inner clamping disc 32, a middle inserting shaft 33, a side limiting column 34, a circular saw blade 35, an outer clamping disc 36, a fixing bolt 37, a sleeve connecting block 38, a protection cushion block 39, a saw blade protection unit 4, a connecting rod 41, an upper protective shell 42, a lower protective shell 43, a locking block 44, a locking hole 45, a mounting block 46, a locking plate 47, a locking hole 48, a control button 49, an arc-shaped mounting groove 410, a mounting short block 411, a locking bolt 412, a hand-held 5 frame, a hand-held 6 cotton ring, a mounting transverse frame 7, a spark blocking frame 8, a chip collecting box 9 and a bolt fastener 10.

Detailed Description

The following description of the embodiments of the present utility model 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 utility model, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

Referring to fig. 1-8, the present embodiment provides a technical solution: a saw blade protection mechanism for a metal circular sawing machine comprises a gearbox 1, a saw blade mounting unit 3 and a saw blade protection unit 4;

gearbox 1: the square box body is provided with a chamfer at the position of the horizontal edge, the motor 2 is fixedly arranged at the rear side of the gearbox 1, the output end of the motor is connected with the saw blade mounting unit 3 of the gearbox 1, and the input end of the motor 2 is electrically connected with the output end of an external power supply through an external control switch group;

saw blade mounting unit 3: is arranged on the left side of the gearbox 1;

blade guard unit 4: connecting rod 41, go up protective housing 42, lower protective housing 43, 44 lock joint piece 44, lock joint hole 45, installation piece 46 and mortise lock piece 47, the left side of gearbox 1 leans on last position department fixedly connected with two horizontal connecting rods 41, the one end fixed connection of connecting rod 41 keeping away from gearbox 1 is on last protective housing 42's right flank, go up protective housing 42 and be provided with lower protective housing 43 in its inside nest, lower protective housing 43 sliding connection just can follow the outward pull of the front end of last protective housing 42 in the inside of last protective housing 42, the outside of two sections all fixedly connected with one T-shaped lock joint piece 44 in going up protective housing 42, lock joint hole 45 has been seted up to the lower extreme of lock joint piece 44 up, the outside fixedly connected with square installation piece 46 of one end of lower protective housing 43 stretches out last protective housing 42, the upper and lower both ends of installation piece 46 are all fixedly connected with one vertically mortise lock piece 47, an arc mounting groove 410 has been seted up on the front end right side of last protective housing 42, the middle part fixedly connected with installation short piece 411 of arc mounting groove 410, an inside connection short piece 412 has a post-shaped bolt 410 to pass the right side of the screw bolt of the last protective housing 42.

The gear box 1 is used for carrying out variable speed transmission on the output shaft of the motor 2, the saw blade mounting unit 3 is used for carrying out effective mounting and fixing on the circular saw blade 35 so as to ensure good cutting function, the connecting rod 41 is used for mounting the upper protective shell 42, the lower protective shell 43 is slidably embedded in the upper protective shell 42, when the circular saw machine is in cutting work, the lower protective shell 43 can be completely contained in the upper protective shell 42 so as to keep the upper protective shell 42 to protect the upper half part of the circular saw blade 35, when the circular saw machine is not in use, the lower protective shell 43 can be pulled out to form a complete disc with the upper protective shell 42, the circular saw blade 35 is fully protected, the lower protective shell 43 can be effectively fixed with the upper protective shell 42 in pulling out and containing, the mounting block 46 is used for mounting the inserting locking plate 47 in a containing state, the lock piece 47 is pegged graft fixedly to lock piece 44 of lower protective housing 43 and last protective housing 42 front end through the upside, when pulling out the state, lower protective housing 43 is pegged graft fixedly to lock piece 44 of lock piece 47 and last protective housing 42 rear end through the downside, lock hole 45 is used for pegging graft fixedly of lock piece 47, arc mounting groove 410 is used for the installation of installation short piece 411, the installation short piece 411 is used for the threaded connection of lock bolt 412, lock bolt 412 can support the right side at lower protective housing 43 through the screwing, thereby can all effectively fix when lower protective housing 43 takes out arbitrary angle, and then can be at the circular cutting machine during operation, take out the lower protective housing 43 and cover the protection also to circular blade's front downside, thereby improved the protection effect to the saw bit.

The blade guard unit 4 further comprises a locking hole 48 and a control button 49, the upper end of the locking piece 47 is provided with a circular locking hole 48, and the upper end of the locking piece 44 is provided with the control button 48. The control button 49 is pressed to enable the inner plunger to pass through the locking hole 48, thereby forming a locking effect on the lower protective case 43.

The saw blade mounting unit 3 comprises a transmission shaft 31, an inner clamping disc 32, a middle inserting shaft 33, side limiting columns 34 and a circular saw blade 35, wherein the transmission shaft 31 is rotationally connected to the middle of the left side of the gearbox 1, one end, far away from the gearbox 1, of the transmission shaft 31 is fixedly connected to the right side circle center position of the inner clamping disc 32, the middle inserting shaft 33 is fixedly connected to the left side circle center position of the inner clamping disc 32, the three side limiting columns 34 are fixedly connected to the circumferential array at the left side eccentric position of the inner clamping disc 32, and the circular saw blade 35 is inserted and mounted on the middle inserting shaft 33 and the side limiting columns 34 through mounting holes formed in the circular saw blade. The transmission shaft 31 is used for driving the inner clamping disc 32 to rotate, the middle inserting shaft 33 is used for inserting and installing the circular saw blade 35, and the side limiting columns 34 penetrate through the circular saw blade 35 from the eccentric position, so that limiting and fixing of the circular saw blade 35 is completed, and installation stability of the circular saw blade 35 in rotation cutting is ensured.

The saw blade mounting unit 3 further comprises an outer clamping disc 36 and a fixing bolt 37, the left ends of the side limiting posts 34 are provided with threaded holes inwards, and the outer clamping disc 36 is clamped on the left side of the circular saw blade 35 and is fixedly connected with the side limiting posts 34 through the fixing bolt 37. The fixing bolt 37 is used for connecting and fixing the outer clamping disc 36 and the side limiting columns 34, and the outer clamping disc 36 is matched with the inner clamping disc 32 to clamp and fix two sides of the circular saw blade 35.

The saw blade mounting unit 3 further comprises a sleeving block 38 and a protection cushion block 39, wherein a plurality of protection cushion blocks 39 are fixedly connected to one side, which is attached to the middle circular saw blade 35, of the inner clamping disc 32 and the outer clamping disc 36 in an array mode, the sleeving block 38 is fixedly connected to the center of the right side of the outer clamping disc 36 and the position of the center of the circle, the sleeving block 38 positioned at the center of the circle corresponds to the size and the position level of the middle inserting shaft 33, the sleeving block 38 positioned at the position of the center of the circle corresponds to the size and the position level of the side limiting column 34, and the sleeving block 38 is sleeved on the outer sides of the middle inserting shaft 33 and the side limiting column 34 respectively. The sleeve block 38 is used for being inserted into the middle insertion shaft 33 and the side limiting posts 34, so that the outer clamping disc 36 is convenient to install, and the protection cushion blocks 39 are used for protecting two sides of the circular saw blade 35.

Still include hand frame 5 and hold cotton circle 6, the upside fixedly connected with hand frame 5 of gearbox 1 and motor 2, and hand frame 5 has the cotton circle 6 of holding towards the outside cover of one section forward. The operator controls the circular sawing machine to press downwards through the hand-pulling frame 5, so that the cutting of the metal material piece is completed, and the hand-holding cotton ring 6 can prevent the hand of the worker from being worn and tingled due to the vibration of the machine.

Still including installation crossbearer 7, spark block 8, collection bits box 9 and bolt fastener 10, the left side fixedly connected with installation crossbearer 7 of motor 2 shell, the one end that motor 2 was kept away from to installation crossbearer 7 passes through bolt fastener 10 installation and is fixed with vertical spark block 8, and spark block 8 both sides outwards open and have seted up tiny exhaust hole, and the lower extreme fixedly connected with collection bits box 9 of spark block 8. The installation crossbearer 7 is arranged in the installation of spark blocking frame 8, and the metal piece that the spark blocking frame 8 produced will cut blocks to make the piece fall into in the album bits box 9 of downside, bolt fastener 10 is arranged in fixing spark blocking frame 8 and installation crossbearer 7, and makes spark blocking frame 8 can dismantle, in order to empty the metal piece in album bits box 9, in order to prevent the high-speed high temperature spark that the metal saw cuts and produces splashes, thereby improved the guard action to the saw bit.

The utility model provides a saw blade protection mechanism for a metal circular sawing machine, which has the following working principle: this protection machanism of circular sawing machine saw bit has reliable saw bit protection unit 4, can all carry out effective protection when circular sawing machine uses and receive and releases, and can conveniently switch in two kinds of protection state: the connecting rod 41 is used for the installation of last protective housing 42, and lower protective housing 43 slides and inlays the inside of establishing at last protective housing 42, when the circular sawing machine at the cutting during operation, can accomodate lower protective housing 43 completely inside last protective housing 42 to keep last protective housing 42 to the upper half of saw blade 35 protects, when the circular sawing machine does not use, can pull out lower protective housing 43 to constitute a complete disc with last protective housing 42, forms the comprehensive protection to saw blade 35, and lower protective housing 43 can both effectively fix with last protective housing 42 when pulling out and accomodating: in the storage state, the lower protective case 43 is inserted and fixed with the lock piece 47 and the lock piece 44 at the front end of the upper protective case 42 through the upper side; in the pulled-out state, the lower protective shell 43 is fixedly inserted with the locking block 44 at the rear end of the upper protective shell 42 through the lower side of the locking piece 47, the locking hole 45 at the lower side of the locking block 44 is used for inserting and fixing the locking piece 47, and the control button 48 can enable the inner inserted rod to pass through the locking hole 48 through pressing, so that a locking effect on the lower protective shell 43 is formed; the locking bolt 412 can be abutted against the right side of the lower protective housing 43 through screwing, so that the lower protective housing 43 can be effectively fixed when being pulled out by any angle, and then the front lower side of the circular blade can be covered and protected by pulling out a small part of the lower protective housing 43 when the circular cutting machine works, and the protection effect on the saw blade is improved. The saw blade protection mechanism is also provided with a reliable saw blade mounting unit 3, and can be used for effectively mounting and fixing the saw blade of the circular sawing machine so as to ensure the mounting stability of the circular saw blade 35 during rotary cutting: the transmission shaft 31 is used for driving the inner clamping disc 32 to rotate, the middle inserting shaft 33 is used for inserting and installing the circular saw blade 35, the side limiting columns 34 penetrate through the circular saw blade 35 from the eccentric position, limiting and fixing of the circular saw blade 35 are achieved, installation stability of the circular saw blade 35 in rotation cutting is guaranteed, the fixing bolts 37 are used for fixing connection between the outer clamping disc 36 and the side limiting columns 34, the outer clamping disc 36 is matched with the inner clamping disc 32 to clamp and fix two sides of the circular saw blade 35, the sleeve joint blocks 38 are used for inserting and installing the middle inserting shaft 33 and the side limiting columns 34, accordingly installation of the outer clamping disc 36 is facilitated, and the protection cushion blocks 39 are used for protecting two sides of the circular saw blade 35. In addition, operating personnel can control the circular sawing machine through the hand-operated shelf 5 and push down to accomplish the cutting to the metal work piece, hold cotton ring 6 and can prevent that workman's hand from wearing and tearing tingling because of the vibrations of machine, install the cross frame 7 and be used for spark to block the installation of frame 8, spark to block the frame 8 and block the metal piece that the cutting produced, and make the piece fall into the album bits box 9 of downside, bolt fastener 10 is used for fixing spark to block frame 8 and installation cross frame 7, and make spark to block frame 8 can dismantle, with the metal piece of empting in album bits box 9, in order to prevent the high-speed high temperature spark that the metal saw cuts the production and splash, thereby improved the guard action to the saw bit.

It is noted that the control switch set disclosed in the above embodiment controls the operation of the motor 2 by a method commonly used in the art.

The foregoing description is only illustrative of the present utility model and is not intended to limit the scope of the utility model, and all equivalent structures or equivalent processes or direct or indirect application in other related technical fields are included in the scope of the present utility model.

Claims

1. A saw blade protection mechanism for a metal circular sawing machine is characterized in that: comprises a gearbox (1), a motor (2), a saw blade mounting unit (3) and a saw blade protection unit (4);

gearbox (1): the motor (2) is fixedly arranged at the rear side of the gearbox (1) and the output end of the motor is connected with a transmission part in the gearbox (1), and the input end of the motor (2) is electrically connected with the output end of an external power supply through an external control switch group;

saw blade mounting unit (3): is arranged on the left side of the gearbox (1);

blade guard unit (4): connecting rod (41), last protective housing (42), lower protective housing (43), lock joint piece (44), lock joint hole (45), installation piece (46), mortise lock piece (47), arc mounting groove (410), installation short piece (411) and locking bolt (412), the left side of gearbox (1) is by upper position department fixedly connected with two horizontal connecting rods (41), the one end fixed connection of gearbox (1) is kept away from to connecting rod (41) is on the right flank of last protective housing (42), last protective housing (42) are half circle structure and at its inside nested lower protective housing (43) that are provided with, lower protective housing (43) sliding connection is in the inside of last protective housing (42) and can outwards pull from the front end of last protective housing (42), the outside of two sections all fixedly connected with one T-shaped lock joint piece (44) around last protective housing (42), lock joint hole (45) are seted up to the lower extreme of lock joint piece (44), the outside fixedly connected with of one end of last protective housing (42) is stretched out to lower protective housing (43), one side (46) is seted up square (46) and is connected with one side of installing piece (46) and is fixed with one side (410), the middle part fixedly connected with installation short piece (411) of arc mounting groove (410), the inside threaded connection of installation short piece (411) has a locking bolt (412), the head of locking bolt (412) column section passes arc mounting groove (410) and supports in the right side of lower protective housing (43).

2. The blade guard mechanism for a metal circular saw machine according to claim 1, wherein: the saw blade protection unit (4) further comprises a locking hole (48) and a control button (49), the upper end of the mortise lock piece (47) is provided with a circular locking hole (48), and the upper end of the locking block (44) is provided with the control button (49).

3. The blade guard mechanism for a metal circular saw machine according to claim 1, wherein: saw bit installation unit (3) contain transmission shaft (31), interior joint dish (32), middle part cartridge (33), side limit post (34) and saw blade (35), the left side middle part rotation of gearbox (1) is connected with transmission shaft (31), the one end fixed connection that gearbox (1) was kept away from to transmission shaft (31) is in the right side centre of a circle position department of interior joint dish (32), the left side centre of a circle position department fixedly connected with middle part cartridge (33) of interior joint dish (32), the left side eccentric position department circumference array fixedly connected with three side limit post (34) of interior joint dish (32), saw blade (35) are pegged graft through the mounting hole that self was seted up and are installed on middle part cartridge (33) and side limit post (34).

4. The blade guard mechanism for a metal circular saw machine according to claim 3, wherein: the saw blade mounting unit (3) further comprises an outer clamping disc (36) and a fixing bolt (37), threaded holes are formed in the left end of the side limiting column (34) inwards, and the outer clamping disc (36) is clamped on the left side of the circular saw blade (35) and fixedly connected with the side limiting column (34) through the fixing bolt (37).

5. The blade guard mechanism for a metal circular saw machine according to claim 4, wherein: the saw blade mounting unit (3) further comprises a sleeving block (38) and a protection cushion block (39), one side, which is attached to the middle circular saw blade (35), of the inner clamping disc (32) and the outer clamping disc (36) is fixedly connected with a plurality of protection cushion blocks (39) in an array mode, the sleeving block (38) is fixedly connected to the circle center and the eccentric position of the right side of the outer clamping disc (36), the sleeving block (38) located at the circle center corresponds to the size and the position level of the middle inserting shaft (33), the sleeving block (38) located at the eccentric position corresponds to the size and the position level of the side limiting column (34), and the sleeving block (38) is sleeved on the outer sides of the middle inserting shaft (33) and the side limiting column (34) respectively.

6. The blade guard mechanism for a metal circular saw machine according to claim 1, wherein: still include hand frame (5) and hold cotton circle (6), the upside fixedly connected with hand frame (5) of gearbox (1) and motor (2), and hand frame (5) have to hold cotton circle (6) towards the outside cover of first section.

7. The blade guard mechanism for a metal circular saw machine according to claim 1, wherein: still including installation crossbearer (7), spark block frame (8), collection bits box (9) and bolt fastener (10), the left side fixedly connected with of motor (2) shell installs crossbearer (7), the one end that motor (2) was kept away from to installation crossbearer (7) is fixed with vertical spark block frame (8) through bolt fastener (10) installation, the both sides of spark block frame (8) outwards open and have seted up tiny exhaust hole, the lower extreme fixedly connected with collection bits box (9) of spark block frame (8).