CN113211572A - Tool type circular saw protective cover and working principle thereof - Google Patents

Abstract

The invention provides a tool type circular saw protective cover and a working principle thereof, the tool type circular saw protective cover comprises a circular saw main body, the middle part of the upper end surface of the circular saw main body is rotationally connected with a saw blade, four corners of the lower end surface of the circular saw main body are fixedly provided with universal wheels, a control panel is embedded in the front end face of the circular saw main body, an adjusting fixing rod is fixedly connected in the middle of the rear end face of the circular saw main body, the adjusting fixing rod comprises a fixing block, a sleeve rod, a limiting hole, an adjusting knob, a height adjusting rod main body, a fixing connecting sheet and a fixing hole, the fixed connecting sheet is fixedly connected with the front end surface of the height adjusting rod main body, the invention takes the improvement of the satisfaction rate of the use of the circular saw protective cover in the construction site as a starting point, the simple and practical tool type circular saw protective cover device aims at effectively solving the potential safety hazard caused by improper protective measures and improving the field safety management level.

Description

Tool type circular saw protective cover and working principle thereof

Technical Field

The invention relates to the technical field of building protection equipment, in particular to a tool type circular saw protective cover and a working principle thereof.

Background

With the rapid development of civil project industrialization, safety management work is more and more important, the circular saw is a key concern item of numerous building enterprises and society, particularly, the circular saw is high in use frequency of a construction site, safety protection measures are insufficient, personnel injury safety accidents caused by the circular saw occur in a plurality of construction sites, and disastrous and painful results which are difficult to recover are brought to a plurality of worker families. The material specification that the job site needs the circular saw cutting is various, adds to establish simple and easy circular saw protection casing and can't satisfy the actual need of job site, and a lot of front-end workers are because use inconvenient and demolish or abandon the circular saw protection casing privately, cause on-the-spot safety control risk increase. Therefore, it is very important to develop a novel circular saw protective cover to ensure that the use accident rate of the woodworking circular saw is zero.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a tool type circular saw protective cover and a working principle thereof, and aims to solve the problems in the background technology.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme: a tool type circular saw protective cover comprises a circular saw main body, wherein a saw blade is rotatably connected to the middle of the upper end face of the circular saw main body, universal wheels are fixedly mounted at four corners of the lower end face of the circular saw main body, a control panel is embedded in the front end face of the circular saw main body, an adjusting and fixing rod is fixedly connected to the middle of the rear end face of the circular saw main body, the adjusting and fixing rod comprises a fixing block, a sleeve rod, a limiting hole, an adjusting knob, a height adjusting rod main body, a fixing connecting sheet and a fixing hole, the fixing connecting sheet is fixedly connected to the front end face of the height adjusting rod main body, the fixing hole is formed in four corners of the front end face of the fixing connecting sheet, the sleeve rod is slidably sleeved in the height adjusting rod main body, the adjusting knob is rotatably connected to one side of the side end face of the height adjusting rod main body, the limiting hole is formed in one side of the side end face of the sleeve rod sleeve adjusting knob, the fixing block is fixedly connected with the upper end face of the sleeve joint rod, the upper part of the side end face of the adjusting fixing rod is fixedly connected with a sliding cross rod, the lower end face of the sliding cross rod is slidably connected with a main keel, the main keel comprises a sliding block, a second pin groove, a stepping motor, an operating rod, an electric push rod, a sliding rod groove, a keel groove, a connecting piece and a fixing bolt, the stepping motor is fixedly installed on two sides of the side end face of the electric push rod, the stepping motor is connected with the electric push rod in a driving mode, the sliding block is fixedly connected with the upper end face of the electric push rod, the second pin groove is formed in the sliding block, the operating rod is fixedly installed on the front end face of the electric push rod, the operating rod is electrically connected with the stepping motor, the connecting piece is fixedly connected with the lower end face of the electric push rod, the fixing bolt is rotatably connected with the edge of the upper end face of the connecting piece, and the keel groove is formed in the connecting piece, the utility model discloses a saw blade of a motor vehicle, including main keel, slide bar groove, first cotter way, control panel and saw bit electrical property link to each other, the slide bar groove is seted up in the inside in keel groove, just first cotter way has been seted up to the side end face of slide horizontal pole, the inside through connection in first cotter way has fixed pin, the lower terminal surface fixedly connected with disc cover of main keel, control panel and saw bit electrical property link to each other.

Preferably, the lower end face of the sliding cross rod is provided with a sliding groove matched with the sliding block, and the main keel is connected to the lower end face of the sliding cross rod through the sliding block in a sliding manner.

Preferably, the second pin groove is matched with the fixing pin, and the fixing pin penetrates through the second pin groove and the first pin groove to fix the sliding block.

Preferably, the disc cover includes secondary joist, speed sensor, pulley, bee calling organ and disc cover main part, secondary joist fixed connection is at the up end of disc cover main part, speed sensor inlays the middle part of establishing at disc cover main part side end inner wall, bee calling organ inlays and establishes at disc cover main part side end, the lower terminal surface of connection at disc cover main part is rotated to the pulley.

Preferably, the rotation speed sensor is electrically connected with the control panel, and the buzzer is electrically communicated with the rotation speed sensor and the control panel.

Preferably, the secondary joist includes slide bar, secondary joist main part and screw hole, slide bar fixed connection is at the up end of secondary joist main part, the screw hole is equipped with four groups at least and sets up the up end in the secondary joist main part, just the screw hole is evenly respectively in the both sides of slide bar.

Preferably, the size of secondary joist main part and slide bar is respectively with the big or small looks adaptation in keel groove and slide bar groove, secondary joist sliding connection is in the inside of connecting piece, just fixing bolt and screw hole looks adaptation.

Preferably, adjust knob includes dwang, screw thread, knob main part, anti-skidding line and dust washer, dwang fixed connection is in the side end face one side of knob main part, the screw thread inlays the surface of establishing at the dwang, the surface at the knob main part is seted up to anti-skidding line, the surface at the dwang is established to the dust washer inlays, just the dust washer is located between knob main part and the screw thread, dwang and spacing pore looks adaptation.

Preferably, the one end that the dwang deviates from the knob main part is equipped with the extension piece, the extension piece is frustum shape or hemisphere.

Still include the theory of operation of a instrument formula circular saw protection casing: the circular saw is pushed to move to a proper working position, the adjusting fixing rod is fixed on the rear end face of the circular saw main body through a fixing connecting piece by using a fixing bolt, an adjusting knob is rotated, the rotating rod transversely moves in the height adjusting rod main body under the action of threads, the sleeving rod is drawn out and adjusted to a proper height, the sleeving rod is fixed through the adaptation of the rotating rod and a limiting hole, the sliding cross rod is fixedly connected on the front end face of the fixing block, the lower end face of the sliding cross rod is slidably connected with a main keel through a sliding block, the main keel is limited and fixed through pin connection of a fixing pin and a first pin groove and a second pin groove, so that the position of the main keel can be longitudinally adjusted relative to the circular saw main body, meanwhile, a circular disc cover is fixedly connected on the lower end face of the main keel, the circular disc cover slides and is fixed through adaptation of a secondary keel and a connecting piece, and the sliding rod and the secondary keel main body are slidably connected in the sliding groove and the keel groove, the auxiliary keel is fixed through the matching of the fixing bolt and the threaded hole, the position of the disc cover can be transversely adjusted through the auxiliary keel, the disc cover is positioned above the saw blade through adjusting the main keel and the auxiliary keel, the electric push rod is arranged inside the main keel and is driven by a stepping motor and controlled by an operating lever, so that the height of the disc cover in the vertical direction can be freely adjusted, the disc cover covers the saw blade through adjusting the height of the disc cover, the saw blade is covered to prevent safety accidents during cutting, a certain gap is reserved between the bottom of the disc cover and the upper end face of the disc saw main body for pushing and cutting a cutting plate, meanwhile, a pulley is rotatably connected to the lower end face of the disc cover main body to facilitate pushing of the cutting plate, further, the mounting position of the disc cover is ensured to be true, and the rotating speed sensor and the buzzer are electrically connected with the control panel, when the control panel controls the saw blade to start, the rotating speed sensor can detect the rotating condition of the saw blade in the disc cover main body, when the rotating speed sensor cannot detect the saw blade to rotate, the rotating speed sensor indicates that the disc cover is not installed in place, and then sends a signal to the control panel and triggers the buzzer to give an alarm.

(III) advantageous effects

The invention provides a tool type circular saw protective cover and a working principle thereof, and the tool type circular saw protective cover has the following beneficial effects: the disc cover is arranged on the saw blade, so that the problem that the saw blade of the disc saw is exposed is solved, the disc cover prevents a worker from closely contacting the saw blade when operating, and meanwhile, the height of the protective cover can be adjusted according to the specification of a material to be cut on site. The position of the disc cover can be adjusted up, down, left and right, the device is convenient to operate, is suitable for cross cutting operation of various materials in a construction site, can also be suitable for main body devices of different types of disc saws, and has strong adaptability, can be independently disassembled to be used as a protective tool, has wide market prospect, has no state monitoring function in the prior disc protective cover, can not confirm whether a worker really installs the disc protective cover, furthermore, the proposal is provided with a rotating speed sensor, the rotating speed sensor and the buzzer are both electrically connected with the control panel, when the control panel controls the saw blade to start, the rotating speed sensor can detect the rotating condition of the saw blade in the main body of the disc cover, when the rotation speed sensor does not detect the rotation of the saw blade, the installation of the disc cover is not in place, then a signal is sent to the control panel and the buzzer is triggered to give an alarm, so that the safe use of the circular saw main body is ensured to the maximum extent.

Drawings

FIG. 1 is a schematic structural diagram of an apparatus body according to the present invention;

FIG. 2 is a schematic view of an adjusting rod according to the present invention;

FIG. 3 is a schematic view of the structure of the disc cover of the present invention;

figure 4 is a schematic view of the main keel structure of the invention;

FIG. 5 is a schematic view of an adjusting knob according to the present invention;

figure 6 is a schematic view of the structure of the secondary keel of the invention.

In the figure: the device comprises a sliding cross rod 1, a first pin groove 2, an adjusting and fixing rod 3, a circular saw body 4, a saw blade 5, a universal wheel 6, a control panel 7, a circular disc cover 8, a main keel 9, a fixing pin 10, a fixing block 11, a sleeving rod 12, a fixing hole 13, an adjusting knob 14, a height adjusting rod body 15, a fixing connecting sheet 16, a fixing hole 17, a secondary keel 18, a rotation speed sensor 19, a pulley 20, a buzzer 21, a circular disc cover body 22, a sliding block 23, a second pin groove 24, a stepping motor 25, a control lever 26, an electric push rod 27, a sliding rod groove 28, a keel groove 29, a connecting piece 30, a fixing bolt 31, a rotating rod 32, a thread 33, a knob body 34, an antiskid thread 35, a dustproof gasket 36, an extending block 37, a sliding rod 38, a secondary keel body 39 and a threaded hole 40.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention. Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be mechanically connected, may be electrically connected or may be in communication with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

The following disclosure provides many different embodiments or examples for implementing different features of the invention. To simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. Furthermore, the present invention may repeat reference numerals and/or letters in the various examples, such repetition is for the purpose of simplicity and clarity and does not in itself dictate a relationship between the various embodiments and/or configurations discussed. In addition, the present invention provides examples of various specific processes and materials, but one of ordinary skill in the art may recognize applications of other processes and/or uses of other materials.

The embodiment of the invention provides a tool type circular saw protective cover, which comprises a circular saw main body 4, wherein the middle part of the upper end surface of the circular saw main body 4 is rotatably connected with a saw blade 5, four corners of the lower end surface of the circular saw main body 4 are fixedly provided with universal wheels 6, a control panel 7 is embedded in the front end surface of the circular saw main body 4, the middle part of the rear end surface of the circular saw main body 4 is fixedly connected with an adjusting and fixing rod 3, the adjusting and fixing rod 3 comprises a fixing block 11, a sleeve rod 12, a limiting hole 13, an adjusting knob 14, a height adjusting rod main body 15, a close-up connecting piece 16 and a fixing hole 17, the fixing connecting piece 16 is fixedly connected with the front end surface of the height adjusting rod main body 15, the fixing hole 17 is arranged at four corners of the front end surface of the fixing connecting piece 16, the sleeve rod 12 is slidably sleeved in the height adjusting rod main body 15, the adjusting knob 14 is rotatably connected with one side end surface of the height adjusting rod main body 15, the limiting hole 13 is sleeved on one side end surface of the adjusting knob 14 of the height adjusting rod 12, the fixing block 11 is fixedly connected to the upper end face of the sleeve rod 12, the upper part of the side end face of the adjusting fixing rod 3 is fixedly connected with the sliding cross rod 1, the lower end face of the sliding cross rod 1 is slidably connected with the main keel 9, the main keel 9 comprises a sliding block 23, a second pin groove 24, a stepping motor 25, an operating rod 26, an electric push rod 27, a sliding rod groove 28, a keel groove 29, a connecting piece 30 and a fixing bolt 31, the stepping motor 25 is fixedly installed on two sides of the side end face of the electric push rod 27, the stepping motor 25 is connected with the electric push rod 27 in a driving manner, the sliding block 23 is fixedly connected to the upper end face of the electric push rod 27, the second pin groove 24 is arranged inside the sliding block 23, the operating rod 26 is fixedly installed on the front end face of the electric push rod 27, the operating rod 26 is electrically connected with the stepping motor 25, the connecting piece 30 is fixedly connected to the lower end face of the electric push rod 27, the fixing bolt 31 is rotatably connected to the edge of the upper end face of the connecting piece 30, the keel groove 29 is formed in the connecting piece 30, the slide bar groove 28 is formed in the keel groove 29, the side end face of the sliding cross rod 1 is provided with the first pin groove 2, the fixing pin 10 penetrates through the first pin groove 2, the lower end face of the main keel 9 is fixedly connected with the disc cover 8, and the control panel 7 is electrically connected with the saw blade 5.

The lower end face of the sliding cross rod 1 is provided with a sliding groove matched with the sliding block 23, the main keel 9 is connected to the lower end face of the sliding cross rod 1 in a sliding mode through the sliding block 23, the second pin groove 24 is matched with the fixing pin 10, the fixing pin 10 penetrates through the second pin groove 24 and the first pin groove 2 to fix the sliding block 23, the disc cover 8 comprises a secondary keel 18, a rotating speed sensor 19, a pulley 20, a buzzer 21 and a disc cover main body 22, the secondary keel 18 is fixedly connected to the upper end face of the disc cover main body 22, the rotating speed sensor 19 is embedded in the middle of the inner wall of the side end face of the disc cover main body 22, the buzzer 21 is embedded in the side end face of the disc cover main body 22, the pulley 20 is rotatably connected to the lower end face of the disc cover main body 22, the rotating speed sensor 19 is electrically connected with the control panel 7, the buzzer 21 is electrically connected with the rotating speed sensor 19 and the control panel 7, the secondary keel 18 comprises a sliding rod 38, The adjusting knob 14 comprises a rotating rod 32, a thread 33, a knob body 34, an anti-skid thread 35 and a dustproof gasket 36, the rotating rod 32 is fixedly connected to one side of the side end face of the knob body 34, the thread 33 is embedded in the surface of the rotating rod 32, the anti-skid thread 35 is arranged on the surface of the knob body 34, the dustproof gasket 36 is arranged between the knob body 34 and the thread 33, the rotating rod 32 is matched with the limiting hole 13, the end of the rotating rod 32 departing from the knob body 34 is provided with an extending block 37, and the extending block 37 is in a frustum shape or a hemisphere shape.

The utility model also comprises a working principle of the tool type circular saw shield, which can push the circular saw main body 4 to move to a proper working position, the adjusting fixing rod 3 is fixed on the rear end face of the circular saw main body 4 by the fixing bolt 31 through the fixing connecting sheet 16, the adjusting knob 14 is rotated, the rotating rod 32 moves transversely in the height adjusting rod main body 15 under the action of the thread 33, the sleeve rod 12 is drawn out to be adjusted to a proper height, the sleeve rod 12 is fixed through the adaptation of the rotating rod 32 and the limiting hole 13, the sliding cross rod 1 is fixedly connected on the front end face of the fixing block 11, the lower end face of the sliding cross rod 1 is connected with the main keel 9 through the sliding block 23, the main keel 9 is limited and fixed on the main keel 9 through the pin joint of the fixing pin 10 and the first pin groove 2 and the second pin groove 24, so that the position of the main keel 9 can be adjusted longitudinally relative to the circular saw main body 4, meanwhile, the lower end face of the main keel 9 is fixedly connected with a disc cover 8, the disc cover 8 slides and is fixed through the matching of the secondary keel 18 and the connecting piece 30, the slide rod 38 and the secondary keel main body 39 are connected inside the slide rod groove 28 and the keel groove 29 in a sliding manner, the secondary keel 18 is fixed through the matching of the fixing bolt 31 and the threaded hole 40, the position of the disc cover 8 can be transversely adjusted through the secondary keel 18, the disc cover 8 is positioned above the saw blade 5 through adjusting the main keel 9 and the secondary keel 18, the electric push rod 27 is arranged inside the main keel 9, the electric push rod 27 is driven by the stepping motor 25 and controlled by the operating rod 26, the vertical height of the disc cover 8 can be freely adjusted, the disc cover 8 covers the saw blade 5 through adjusting the height of the disc cover 8, the saw blade 5 is covered to prevent safety accidents during cutting, and a certain gap is left between the bottom of the disc cover 8 and the upper end face of the disc saw main body 4, a push and cutting for cutting panel, it is convenient for cut pushing of panel to rotate to be connected with pulley 20 simultaneously at the lower terminal surface of disc cover main part 22, further for ensuring that the mounted position of disc cover 8 is true, speed sensor 19 and bee calling organ 21 all link to each other with control panel 7 electrical property, speed sensor 19 can detect the rotation condition of the inside saw bit 5 of disc cover main part 22 when control panel 7 control saw bit 5 starts, then indicate when speed sensor 19 does not detect saw bit 5 and rotate that the installation of disc cover 8 does not target in place, then send signal to control panel 7, and trigger bee calling organ 21 and send out the police dispatch newspaper.

In conclusion, the disc cover 8 is arranged on the saw blade 5, so that the problem that the saw blade of the disc saw is exposed is solved, the disc cover 8 prevents a worker from closely contacting the saw blade when operating, and meanwhile, the height of the protective cover can be adjusted according to the specification of materials to be cut on site. The position of the disc cover 8 can be adjusted up and down and left and right, the device is convenient to operate, the device is suitable for cross cutting operation of various materials in a construction site, the device is also suitable for various disc saw main bodies 4, the device has strong adaptability, can be independently disassembled to be used as a protective tool, has wide market prospect, the existing disc protective cover does not have a state monitoring function, whether a worker really installs the disc cover 8 cannot be confirmed, and further a rotating speed sensor 19 is arranged in the scheme, the rotating speed sensor 19 and a buzzer 21 are electrically connected with a control panel 7, when the control panel 7 controls the saw blade 5 to start, the rotating speed sensor 19 can detect the rotating condition of the saw blade 5 in the disc cover main body 22, when the rotating speed sensor 19 cannot detect the saw blade 5, the rotating condition indicates that the disc cover 8 is not installed in place, a signal is sent to the control panel 7, and the buzzer 21 is triggered to give an alarm, the safe use of the circular saw body 4 is ensured to the maximum extent.

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 (10)

1. A tool-type circular saw guard includes a circular saw body (4), characterized in that: the middle part of the upper end face of the circular saw main body (4) is rotatably connected with a saw blade (5), four corners of the lower end face of the circular saw main body (4) are fixedly provided with universal wheels (6), a control panel (7) is embedded in the front end face of the circular saw main body (4), the middle part of the rear end face of the circular saw main body (4) is fixedly connected with an adjusting and fixing rod (3), the adjusting and fixing rod (3) comprises a fixing block (11), a sleeve joint rod (12), a limiting hole (13), an adjusting knob (14), a height adjusting rod main body (15), a fixed connecting sheet (16) and a fixing hole (17), the fixed connecting sheet (16) is fixedly connected with the front end face of the height adjusting rod main body (15), the fixing hole (17) is arranged on the front four corners of the fixed connecting sheet (16), the sleeve joint rod (12) is slidably sleeved inside the height adjusting rod main body (15), adjusting knob (14) rotates and connects in side end face one side of altitude mixture control pole main part (15), spacing hole (13) are seted up and are being pressed close to adjusting knob's (14) side end face one side at cup joint pole (12), fixed block (11) fixed connection is in the up end of cup joint pole (12), the side end face upper portion fixedly connected with slip horizontal pole (1) of adjusting dead lever (3), the lower terminal surface sliding connection of slip horizontal pole (1) has main joist (9), main joist (9) include slider (23), second pin groove (24), step motor (25), control rod (26), electric putter (27), slide bar groove (28), keel groove (29), connecting piece (30) and fixing bolt (31), step motor (25) fixed mounting is in the side end face both sides of electric putter (27), just step motor (25) link to each other with electric putter (27) drive, the utility model discloses a novel keel structure, including slider (23), second cotter way (24), connecting piece (30), fixing bolt (31), keel way (29), connecting piece (29), first cotter way (2) has been seted up to the side end face of slider (23), the inside at slider (23) is seted up to second cotter way (24), operating rod (26) fixed mounting is at the preceding terminal surface of electric putter (27), operating rod (26) and step motor (25) electrical property link to each other, the lower terminal surface of connecting piece (30) fixed connection, fixing bolt (31) rotate the upper end face edge of connecting piece (30), keel way (29) are seted up in the inside of connecting piece (30), the inside in keel way (28) is seted up in keel way (29), just first cotter way (2) has been seted up to the side end face of slip horizontal pole (1), the inside through connection in first cotter way (2) has fixed pin (10), the lower terminal surface fixedly connected with disc cover (8) of main joist (9), the control panel (7) is electrically connected with the saw blade (5).

2. A protective cover for a circular saw of the tool type as claimed in claim 1, wherein: the lower end face of the sliding cross rod (1) is provided with a sliding groove matched with the sliding block (23), and the main keel (9) is connected to the lower end face of the sliding cross rod (1) in a sliding mode through the sliding block (23).

3. A protective cover for a circular saw of the tool type as claimed in claim 2, wherein: the second pin groove (24) is matched with the fixed pin (10), and the fixed pin (10) penetrates through the second pin groove (24) and the first pin groove (2) to fix the sliding block (23).

4. A protective cover for a circular saw of the tool type as claimed in claim 1, wherein: disc cover (8) include () secondary joist (18), tachometer (19), pulley (20), bee calling organ (21) and disc cover main part (22), secondary joist (18) fixed connection is at the up end of disc cover main part (22), tachometer (19) inlay the middle part of establishing at disc cover main part (22) side end inner wall, bee calling organ (21) inlay and establish at disc cover main part (22) side end face, pulley (20) rotate to be connected at the lower terminal surface of disc cover main part (22).

5. A tool-style circular saw guard according to claim 4, wherein: the rotating speed sensor (19) is electrically connected with the control panel (7), and the buzzer (21) is electrically communicated with the rotating speed sensor (19) and the control panel (7).

6. A tool-style circular saw guard according to claim 4, wherein: the secondary joist (18) comprises a sliding rod (38), a secondary joist main body (39) and a threaded hole (40), the sliding rod (38) is fixedly connected to the upper end face of the secondary joist main body (39), the threaded hole (40) is at least provided with four groups of upper end faces arranged on the secondary joist main body (39), and the threaded hole (40) is evenly arranged on two sides of the sliding rod (38) respectively.

7. A protective cover for a circular saw of the tool type as defined in claim 6, wherein: the size of secondary joist main part (39) and slide bar (38) is respectively with keel groove (29) and the size looks adaptation of slide bar groove (28), secondary joist (18) sliding connection is in the inside of connecting piece (30), just fixing bolt (31) and screw hole (40) looks adaptation.

8. A protective cover for a circular saw of the tool type as claimed in claim 1, wherein: adjust knob (14) are including dwang (32), screw thread (33), knob main part (34), anti-skidding line (35) and dust washer (36), dwang (32) fixed connection is in the side end face one side of knob main part (34), screw thread (33) are inlayed and are established on the surface of dwang (32), the surface in knob main part (34) is seted up in anti-skidding line (35), dust washer (36) are inlayed and are established on the surface of dwang (32), just dust washer (36) are located between knob main part (34) and screw thread (33), dwang (32) and spacing hole (13) looks adaptation.

9. A protective cover for a circular saw of the tool type as defined in claim 8, wherein: the one end that dwang (32) deviates from knob main part (34) is equipped with extension piece (37), extension piece (37) are frustum shape or hemisphere.

10. The working principle of the tool type circular saw guard according to any one of claims 1 to 9, wherein: promote circular saw main part (4) to remove to suitable operating position, use fixing bolt (31) to fix regulation dead lever (3) at the rear end face of circular saw main part (4) through fixed connection piece (16), rotate adjust knob (14), under the effect of screw thread (33), dwang (32) is at the inside lateral shifting of altitude mixture control pole main part (15), take out cup joint pole (12) and adjust to suitable height, fix cup joint pole (12) through the adaptation of dwang (32) and spacing hole (13), slip horizontal pole (1) fixed connection is at the preceding terminal surface of fixed block (11), the lower terminal surface of slip horizontal pole (1) has main joist (9) through slider (23) sliding connection, main joist (9) carry out spacing fixed to main joist (9) through the pin joint of fixed pin (10) with first cotter groove (2) and second cotter groove (24), so that the position of the main keel (9) can be longitudinally adjusted relative to the circular saw main body (4), meanwhile, the lower end surface of the main keel (9) is fixedly connected with a circular disc cover (8), the circular disc cover (8) slides and is fixed through the adaptation of the secondary keel (18) and the connecting piece (30), the sliding rod (38) and the secondary keel main body (39) are connected in the sliding rod groove (28) and the keel groove (29) in a sliding way, the secondary keel (18) is fixed through the adaptation of the fixing bolt (31) and the threaded hole (40), the position of the circular disc cover (8) can be transversely adjusted through the secondary keel (18), the circular disc cover (8) is positioned above the saw blade (5) through adjusting the main keel (9) and the secondary keel (18), the electric push rod (27) is arranged in the main keel (9), the electric push rod (27) is driven by the stepping motor (25) and is controlled by the operating rod (26), the height of the disc cover (8) in the vertical direction can be freely adjusted, the disc cover (8) is adjusted to cover the saw blade (5) to prevent safety accidents during cutting, a certain gap is reserved between the bottom of the disc cover (8) and the upper end face of the disc saw main body (4) and used for pushing and cutting a cutting plate, meanwhile, a pulley (20) is rotatably connected to the lower end face of the disc cover main body (22) to facilitate pushing of the cutting plate, further, in order to ensure that the mounting position of the disc cover (8) is true, the rotating speed sensor (19) and the buzzer (21) are electrically connected with the control panel (7), when the control panel (7) controls the saw blade (5) to start, the rotating speed sensor (19) can detect the rotating condition of the saw blade (5) inside the disc cover main body (22), and when the rotating speed sensor (19) cannot detect the saw blade (5), the mounting of the disc cover (8) is not in place, a signal is sent to the control panel (7) and triggers the buzzer (21) to sound an alarm.

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