CN219443617U - Safety cutting machine - Google Patents

Abstract

The utility model relates to the technical field of cutting machines, in particular to a safe cutting machine, which comprises a base, wherein a leveling device and a cutting device are movably connected to the base, the cutting device comprises a cutting blade controlled by a motor, a braking device which can enable the cutting blade to stop suddenly when power is cut off is arranged in a protective cover, a human body induction sensor is also fixed on the protective cover, the human body induction sensor is electrically connected with a controllable device, and the controller controls whether the motor and the braking device are powered on or not. Compared with the prior art, this patent sets up levelling device and by human body induction sensor control's arresting gear, has solved the blade that the operator is too close to the cutting machine if carelessly jointly, probably can touch the blade or by the flying chip incised wound that produces when cutting, the technical problem of scald to and the cutting machine inadaptable uneven ground environment, thereby lead to the technical problem of material incision unevenness.

Description

Safety cutting machine

Technical Field

The utility model relates to the technical field of cutting machines, in particular to a safe cutting machine.

Background

The cutting machine is a tool for cutting by driving a blade through a transmission mechanism, and is suitable for cutting stone, steel, pipe and other materials. The operation mode of the existing cutting machine is as follows: the cutting machine is powered on, an operator fixes the material to be cut through a clamping device on the cutting machine, then continuously presses a switch of the cutting machine to enable the cutting machine to be communicated with an external power supply, the blade starts to rotate, and the operator presses down the handle to press the rotating blade against the material to be cut, and performs cutting work; when the cutting operation is completed, the operator releases the switch to de-energize the cutter and lifts the handle to move the blade away from the cut material, and then releases the clamping device to remove the cut material.

Along with the development of modern construction field, the security requirement of cutting machine is constantly promoted, simultaneously, also constantly improves the cutting quality of cutting machine, precision requirement, and traditional cutting machine often has following problem in the use:

1. when the cutter is operated, if an operator carelessly gets too close to the blade of the cutter, the operator is likely to touch the blade or cut and scald flying scraps generated when the cutter is cut;

2. when an operator uses a traditional cutting machine to cut, if the ground of a construction site is uneven, the cutting machine can be placed unevenly, and finally uneven cuts are caused.

In view of the foregoing, it is necessary to design a cutting machine with a safety protection device and capable of leveling the whole machine to solve the above problems.

Disclosure of Invention

The utility model aims to provide a safe cutting machine, which mainly solves the technical problems that in the prior art, an operator is likely to touch a blade or cut and scald flying scraps generated when the operator is cut if the operator is carelessly too close to the blade of the cutting machine; the technical problem that when an operator uses a traditional cutting machine to cut, if the ground of a construction site is uneven, the operator can be exposed to the cutting machine to be placed unevenly, and finally uneven cuts are caused in the prior art is solved.

In order to solve the technical problems, the utility model provides the following technical scheme:

the utility model provides a safe cutting machine, includes the base, swing joint has cutting device on the base, cutting device has open-ended protection casing including the below, is provided with the cutting piece in the protection casing, installs the motor outside the protection casing, the output shaft of motor stretch into in the protection casing with cutting piece center fixed connection, install the arresting gear that can make the cutting piece scram in the protection casing, still be fixed with human body sensor on the protection casing, human body sensor electricity is connected with the controller of steerable motor circular telegram or outage and whether control arresting gear work, and the controller is connected with the arresting gear electricity, and the controller is connected with the motor electricity.

The working principle and the beneficial effects of the utility model are as follows:

1. working principle: when an operator approaches to a preset induction range of the human body induction sensor, the human body induction sensor transmits an electric signal to the controller, the controller controls the brake device to work and simultaneously controls the motor to be powered off, the cutting blade keeps rotating due to inertia after losing power source, and at the moment, the brake device synchronously acts on the cutting blade to enable the cutting blade to stop rotating rapidly.

2. The beneficial effects are that: compared with the traditional cutting machine, this patent the cutting machine has added human body induction sensor and arresting gear, when the operator is close to the protection casing, easily take place the danger of cutting, detect in this patent in real time through human body induction sensor, after human body induction sensor has responded to the operator and is close to the back, make the cutting piece lose the power supply through the controller, make arresting gear brake the cutting piece fast simultaneously, the effect of protection operator has been reached, the operator who has solved prior art existence is if too close to the blade of cutting machine carelessly, probably can touch the blade or by the flying chip cutting that produces when cutting, the technical problem of scald.

Preferably, spline gears coaxial with the cutting piece are fixed on the front surface and the back surface of the cutting piece, and the spline gears are provided with a plurality of tooth grooves which are distributed at equal intervals; the inner walls of the protective cover, which are close to the front side and the back side of the cutting piece, are respectively provided with a containing groove for containing the braking device, and the opening of the containing groove faces the tooth slot; the braking device comprises an electromagnet, the electromagnet is fixed at the bottom of the accommodating groove opposite to the tooth groove, one side of the electromagnet, which is close to the tooth groove, is provided with a braking block which is made of magnetic materials and can be clamped into the key groove of the spline gear, a spring which enables the braking block to extend out of the accommodating groove when the electromagnet and the braking block are naturally extended is fixedly connected between the electromagnet and the braking block, and the sum of the length of the compressed spring and the length of the braking block is smaller than the distance between the electromagnet and the opening of the accommodating groove; the electromagnet is electrically connected with the controller. After the external power supply is connected with the cutting machine, the electromagnet is connected with electricity to generate magnetic force, the brake block is sucked into the accommodating groove, and the cutting piece can normally run at the moment; when an operator approaches the cutting blade and enters the sensing range of the human body sensing sensor, the human body sensing sensor transmits an electric signal to the controller, the controller controls the electromagnet and the motor to be powered off simultaneously, the magnetic force of the electromagnet disappears, and the brake block partially stretches out of the accommodating groove under the thrust of the spring and stretches into the key groove of the spline gear on the surface of the cutting blade, so that the cutting blade stops rotating.

Preferably, a safety switch which is started by pressing by a human hand and is lifted to be closed is arranged on the base, the safety switch is electrically connected with an external power supply, and the safety switch is electrically connected with the cutting device. When an operator needs to cut material using a cutter, the safety switch must be held down continuously to energize the cutting device.

Preferably, the cutting device further comprises a bracket fixed above the base, a rotating shaft penetrates through and is rotationally connected with the bracket, the axial lead of the rotating shaft is parallel to the axial lead of the cutting piece, one end, close to the protective cover, of the rotating shaft is fixedly connected with a movable arm, one end, far away from the protective cover, of the rotating shaft is fixedly connected with a handle, and a limiting plate for limiting the rotation angle of the movable arm is arranged on the bracket below the movable arm; one end of the movable arm, which is far away from the bracket, is fixedly connected with the motor, and an electric connection end is arranged at the position, close to the bracket, of the movable arm and is electrically connected with the motor; a discharge end and a blank end are arranged at the contact position of the bracket and the rotating track of the power-on end, and the discharge end is electrically connected with the safety switch; the electric connection end is electrically connected with the discharge end when the contact end contacts the discharge end, and the electric connection between the electric connection end and the discharge end is completely disconnected when the upward rotation angle of the movable arm is at the maximum value. In the rotation range of the power-on end, only a discharge end and a blank end are arranged, when an operator needs to cut materials by using a cutting machine, the safety switch is pressed down firstly to enable the discharge end to be electrified, then the handle is pressed down, the handle drives the movable arm to rotate, the power-on end on the movable arm is communicated with the discharge end, and the motor is electrified to work normally, so that the motor drives the cutting blade to start rotating to cut materials; if danger is encountered, an operator can rapidly release the safety switch to cut off the power of the cutting device, so as to protect the operator, and can rapidly lift the movable arm to the highest position to ensure that the power-on end is completely contacted with the blank end and the motor is cut off; the two protection procedures jointly realize the safety protection of operators.

Preferably, threaded through holes are formed in four corners of the base, a screw is connected in the threaded through holes in a threaded mode, the upper end of the screw is fixedly connected with a first knob, and the lower end of the screw is fixedly connected with a base plate. When the safety cutting machine is placed on the uneven ground, the base plate contacts the ground, and the first knob is rotated to adjust the relative position of the screw rod and the base, so that the base is lifted or lowered; through the height position of adjusting four angles of base to make the base upper surface be located the horizontality, solve the operator that prior art exists when using traditional cutting machine to cut, if job site ground is uneven, can shine into the cutting machine and put uneven, finally lead to the uneven technical problem of incision.

Preferably, a level gauge is horizontally arranged above the base. When an operator levels the base to use the uneven ground, the operator can judge whether the base is adjusted to a horizontal state through the level gauge.

Preferably, the base is further provided with a cutting groove, the cutting groove is located below the cutting piece, one side of the cutting groove, located in the chip flying-out direction when the cutting piece cuts materials, is provided with a chip blocking groove, and an opening of the chip blocking groove faces the chip flying-out direction. During cutting, a large amount of scraps fly out from cutting positions, if the cut materials are metal materials, the flying scraps often have high temperature, scraps can be collided in the scraps blocking grooves by the arrangement of the scraps blocking grooves, a large amount of scraps are prevented from splashing everywhere, the site environment is polluted, and in severe cases, site personnel are scalded or fire is caused.

Preferably, the upper surface of the base is also fixedly connected with a fixing plate, the fixing plate is positioned behind the cutting piece, the fixing plate is perpendicular to the upper surface of the base and perpendicular to the surface of the cutting piece, the upper surface of the base is also provided with a clamping plate, the clamping plate is parallel to the fixing plate, the side surface of the clamping plate, which is far away from the fixing plate, is rotationally connected with a supporting rod, and the supporting rod is horizontally arranged and perpendicular to the side surface of the clamping plate; the base is fixedly connected with a support rod sleeve, a through hole with internal threads is formed in the middle of the support rod sleeve, external threads matched with the internal threads are formed on the outer surface of the support rod, and the support rod penetrates through the through hole and is in threaded connection with the support rod sleeve. Because the supporting rod is in threaded connection with the supporting rod sleeve, when the supporting rod is rotated, the relative position of the supporting rod and the supporting rod sleeve can be adjusted, so that the clamping plate is close to or far from the fixed plate; the material to be cut is placed between the clamping plate and the fixing plate, and the distance between the clamping plate and the fixing plate is adjusted, so that the clamping plate and the fixing plate are matched to clamp and fix the material to be cut.

Preferably, the radius of the sensing range of the human body sensing sensor is 15-20cm.

Drawings

FIG. 1 is a front perspective view of a safety cutter of the present utility model;

FIG. 2 is a rear structural perspective view of the safety cutter of the present utility model;

FIG. 3 is a front view of the safety cutter of the present utility model;

FIG. 4 is a front view of a carriage of the safety cutter of the present utility model;

FIG. 5 is a schematic view of a movable arm power end and a blank end contact of the safety cutter according to the present utility model;

FIG. 6 is a schematic diagram showing the contact between the movable arm power-on end and the discharge end of the safety cutter according to the present utility model;

FIG. 7 is a front view of the guard and cutting blade of the safety cutter of the present utility model;

FIG. 8 is a cross-sectional view A-A of FIG. 7 of the safety cutter of the present utility model;

fig. 9 is a semi-sectional view of the clamping plate and strut structure of the safety cutter of the present utility model.

Reference numerals in the drawings of the specification include: base 1, support 2, limiting plate 21, pivot 22, discharge end 231, blank end 232, movable arm 3, connect electric end 31, handle 4, motor 5, protection casing 6, holding tank 61, electro-magnet 611, spring 612, brake block 613, cutting piece 71, spline gear 711, cutting tank 72, fender bits groove 73, screw 81, first knob 82, backing plate 83, fixed plate 91, clamping plate 92, branch 93, baffle 931, branch cover 94, second knob 95, safety switch 10, level 11.

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.

Based on the above description, the direction of the bracket 2 is "right", the direction of the safety switch 10 is "left", the direction of the shield 6 is "front", and the direction opposite to the shield 6 is "rear", based on the motor 5.

As shown in fig. 1-3, the safety cutting machine is provided with a base 1, one end of the upper surface of the base 1 is provided with a safety switch 10, the safety switch 10 can be pressed down, and after the safety switch 10 is loosened, the safety switch 10 can be automatically reset; the other end of the upper surface of the base 1 is fixedly provided with a bracket 2, the upper end of the bracket 2 is penetrated with a rotating shaft 22, one end of the rotating shaft 22, which is positioned behind the bracket 2, is welded with a handle 4, one end of the rotating shaft 22, which is positioned on the front side of the bracket 2, is welded with a movable arm 3, a motor 5 is welded on the movable arm 3, a hollow protective cover 6 is arranged in front of the motor 5, the protective cover 6 is provided with a downward opening, the middle part of the protective cover 6 is provided with a through hole matched with the output shaft of the motor 5, the output shaft of the motor 5 is inserted into the protective cover 6 from the through hole, a cutting piece 71 is installed into the protective cover 6 from the opening of the protective cover 6, the lower half part of the cutting piece 71 extends out of the protective cover 6 from the opening, the edge of the cutting piece 71 is provided with saw teeth, spline gears 711 coaxial with the cutting piece 71 are fixed on the front and back sides, the spline gears 711 are similar to a common gear, but the tooth teeth of the spline gears 711 are longer, and a plurality of tooth grooves distributed at equal intervals are arranged on the spline gears 711; the centre hole of the cutting blade 71 is splined to an output shaft of the motor 5 extending into the shield 6, rotation of the output shaft driving the cutting blade 71 to rotate, thereby cutting the material placed under the cutting blade 71.

Threaded through holes are formed in four corners of the base 1, threaded rods 81 are connected with the threaded through holes in a threaded mode, first knobs 82 are welded at the upper ends of the threaded rods 81, base plates 83 are connected with the lower ends of the threaded rods in a threaded mode, and the level 11 is installed above the base 1. When the safety cutter is placed on the uneven ground, the pad 83 contacts the ground, and an operator rotates the first knob 82 while observing the level 11, thereby adjusting the relative position of the screw 81 and the base 1, and further raising or lowering the base 1; the upper surface of the base 1 is positioned in a horizontal state by adjusting the height positions of the four corners of the base 1, so that the base is suitable for uneven ground.

As shown in fig. 4-6, a limiting plate 21 is arranged below the movable arm 3, the limiting plate 21 limits the rotation angle of the movable arm 3 by taking the rotating shaft 22 as the rotation center, the rotation angle from the lowest position to the highest position of the left end of the movable arm 3 is 45 degrees, a strong spring is fixed between the lower surface of the movable arm 3 and the base 1, the strong spring is close to the left side of the bracket 2, and if the movable arm 3 is pressed down without force, the left end of the movable arm 3 is stabilized at the highest position by the elasticity of the strong spring.

The movable arm 3 is provided with an electric connection end 31 close to the bracket 2, the electric connection end 31 is electrically connected with the motor 5, a discharge end 231 and a blank end 232 are arranged at the contact position of the bracket 2 and the rotation track of the electric connection end 31, the discharge end 231 is electrically connected with the safety switch 10, and the safety switch 10 is connected with an external power supply; when the safety switch 10 is pressed down, the discharge end 231 is electrified, and the blank end 232 always has no current passing through; when the movable arm 3 is lifted to the highest position, the power receiving end 31 of the movable arm 3 is completely contacted with the blank end 232, and at this time, even if the safety switch 10 is in the on state and the discharge end 231 is electrified, the blank end 232 has no line end connected with the power supply, so that no current passes through the power receiving end 31 of the movable arm 3, the motor 5 cannot work normally, and the cutting blade 71 cannot be driven to rotate.

Firstly, the safety switch 10 is pressed down to electrify the discharge end 231, when an operator presses down the handle 4, and thus the left end of the movable arm 3 is driven to press downwards, the electricity receiving end 31 rotates anticlockwise and contacts with the discharge end 231, so that the motor 5 is electrified to start working, when the left end of the movable arm 3 is lifted up to the highest position, the electricity receiving end 31 rotates clockwise to be completely contacted with the blank end 232, the electricity receiving end 31 is disconnected from the electricity connection with the discharge end 231, no current passes through the electricity receiving end 31, and the motor 5 is powered off to stop working; in this case, if the operator wants to activate the safety cutter, he must simultaneously press the safety switch 10 and the handle 4. Therefore, in this embodiment, the cutting machine needs to be normally operated in the state that the safety switch 10 is pressed and the handle 4 is pressed, the double switch provides double guarantee, so that the situation that the cutting machine is started by mistake to operate and injury to operators or other personnel is caused is avoided, if the operators want to stop the cutting operation, two stopping modes can be adopted, the first mode is that the hands are directly separated from the safety switch 10 to directly power off the motor 5, the second mode is that the strength of the pressing handle 4 is released, the left end of the movable arm 3 naturally rebounds to the highest position under the action of the strong spring, the power receiving end 31 rotates to the blank end 232, and the power receiving end 31 contacts with the blank end 232, so that the motor 5 is powered off.

As shown in fig. 7-8, two accommodating grooves 61 are formed in the inner wall of the protective cover 6 near the front and back surfaces of the cutting blade 71, the accommodating grooves 61 on the same side are bilaterally symmetrical with the output shaft of the motor 5 as a symmetry axis, the openings of the accommodating grooves 61 face tooth grooves of spline gears 711 on the cutting blade 71, the depth of the accommodating grooves 61 is larger than the thickness of the protective cover 6, and meanwhile, the bottoms of the accommodating grooves 61 opposite to the openings protrude out of the surface of the protective cover 6, so that under the condition that the thickness of the protective cover 6 is moderate, the accommodating grooves 61 can have larger accommodating cavities; the bottom of the accommodating groove 61 is welded with an electromagnet 611, the electromagnet 611 is welded with a spring 612, one end of the spring 612, which is far away from the electromagnet 611, is welded with a brake block 613 made of a magnetic material, under the condition that the electromagnet 611 is electrified and has magnetism, the brake block 613 can be completely retracted into the accommodating groove 61 under the action of the magnetic material, the electromagnet 611 and the spring, and when the spring 612 naturally stretches, 1/2 part of the brake block 613 extends out of the accommodating groove 61 and is just clamped into a tooth slot of the spline gear 711; the electromagnet 611 and the motor 5 are electrically connected with a controller, the controller can control whether the electromagnet 611 and the motor 5 are electrified, the controller is also electrically connected with a human body induction sensor, and the human body induction sensor is arranged on the shell of the protective cover 6 (the human body induction sensor and the controller are not shown in the drawing); the radius of the sensing range of the human body sensing sensor is 15cm, the distance between the human body sensing sensor and the hand holding position of the handle 4 and the distance between the human body sensing sensor and the safety switch 10 are both greater than 15cm, and the human body sensing sensor senses the normal operation of an operator when the cutting machine is prevented from being used normally, so that the cutting machine cannot be used normally.

When an operator does not enter the sensing range of the human body sensing sensor, the controller controls the electromagnet 611 and the motor 5 to work normally, the electromagnet 611 generates magnetic force after being electrified, the brake block 613 overcomes the elasticity of the spring 612 and is sucked into the accommodating groove 61 by the electromagnet 611, and at the moment, the cutting blade 71 can rotate freely under the action of the motor 5; when an operator enters the sensing range of the human body sensing sensor, the human body sensing sensor transmits an electric signal to the controller, the controller receives the signal and then controls the electromagnet 611 to be powered off from the motor 5, the cutting blade 71 is kept rotating due to inertia after losing power source, meanwhile, the electromagnet 611 loses magnetism due to power off, the brake block 613 is clamped in the tooth slot of the spline gear 711 after being ejected by the spring 612, the cutting blade 71 is rapidly stopped rotating, and the effect of preventing the operator from being excessively close to the cutting blade 71 to cause injury to a close person is achieved.

The cavities of the brake block 613 and the accommodating groove 61 are both cylinders, and of course, any polygonal prism can be used, and the specific shape is based on the practical situation of the production and processing.

The base 1 is further provided with a cutting groove 72 below the cutting blade 71, when a material is cut, a position to be cut of the material is required to be placed above the cutting groove 72, when the cutting blade 71 is pressed down to cut the material, a large amount of scraps fly out along the rotation tangential direction of the cutting blade 71, the side of the cutting groove 72 and the position in the scraps fly-out direction are provided with scraps blocking grooves 73, the openings of the scraps blocking grooves 73 face the scraps fly-out direction, and scraps are collected in the scraps blocking grooves 73.

As shown in fig. 2, the upper surface of the base 1 is fixedly connected with a fixing plate 91, the fixing plate 91 is positioned behind the cutting groove 72, the fixing plate 91 is perpendicular to the upper surface of the base 1 and perpendicular to the surface of the cutting piece 71, the upper surface of the base 1 is further provided with a clamping plate 92, the clamping plate 92 is parallel to the fixing plate 91, a supporting rod 93 is rotatably connected to the clamping plate 92, and a second knob 95 is welded at one end of the supporting rod 93 away from the clamping plate 92; as shown in fig. 8, the connection structure between the clamping plate 92 and the supporting rod 93 is that the supporting rod 93 penetrates through the middle part of the clamping plate 92, the supporting rod 93 and the clamping plate 92 are in clearance fit, disc-shaped baffles 931 are arranged on two sides of the supporting rod 93 positioned on the clamping plate 92, the clamping plate 92 is clamped by the front-back fit of the two baffles 931, the clamping plate 92 is close to or far from the fixed plate 91 along with the movement of the supporting rod 93, and meanwhile, the baffles 931 can rotate along with the supporting rod 93; a groove for accommodating the baffle on the same side is formed in one side of the clamping plate 92 close to the fixed plate 91, so that one side of the clamping plate 92 close to the fixed plate 91 is kept flat, and the cutting material is convenient to clamp; still fixedly connected with branch cover 94 on the base 1, the internal thread has been seted up to branch cover 94 cavity and internal surface, and the external screw thread has been seted up to branch 93 surface, and branch 93 runs through branch cover 94 through-hole and with branch 93 cover threaded connection, when rotating branch 93, make branch 93 be close to fixed plate 91, can promote clamping plate 92 to be close to fixed plate 91 on the branch 93 to cooperate the material that presss from both sides tightly the cutting with fixed plate 91 jointly.

From the above, the specific implementation manner of this embodiment is as follows:

when the safety cutter is needed to be used, the safety cutter base 1 is adjusted to be in a horizontal state by adjusting the four screws 81 on the base 1 and observing the level meter 11 on the base, then the material to be cut is placed between the fixing plate 91 and the clamping plate 92, the position to be cut is placed on the cutting groove 72 and is positioned under the cutting piece 71, the second knob 95 on the supporting rod 93 is rotated, the supporting rod 93 pushes the clamping plate 92 to be close to the fixing plate 91, the material to be cut is clamped, and then the plug of the safety cutter is inserted into the power socket, so that the whole device is in an electrified standby state.

The operator presses the safety switch 10 with one hand and holds the holding position of the handle 4 with the other hand, so as to press the handle 4 downwards, thereby driving the movable arm 3 to move downwards against the elastic force of the strong spring 612, and further driving the cutting blade 71 to move downwards, meanwhile, the power receiving end 31 on the movable arm 3 is communicated with the discharging end 231 on the bracket 2, so that the motor 5 is electrified, and the cutting blade 71 is driven to start rotating, and the materials below are cut.

When a danger occurs in the cutting process or the cutting work is finished, an operator can directly release the safety switch 10 from the hand or release the handle 4 to enable the movable arm 3 to automatically rebound to the highest position under the thrust of the strong spring, and the motor 5 can be powered off to stop the rotation of the cutting blade 71.

If the operator carelessly gets close to the cutting blade 71 during operation, the operator will enter the sensing range of the human body sensor, the human body sensor transmits an electrical signal to the controller, the controller controls the motor 5 and the electromagnet 611 to be powered off, so that the cutting blade 71 loses power, and simultaneously the brake block 613 ejects the accommodating groove 61 and is clamped into the key slot of the spline gear 711 on the cutting blade 71, so that the cutting blade 71 is stopped rotating rapidly, and the operator is prevented from touching the cutting blade 71 or being cut and scalded by flying scraps generated during cutting.

The foregoing is merely exemplary embodiments of the present utility model, and specific structures and features that are well known in the art are not described in detail herein. It should be noted that modifications and improvements can be made by those skilled in the art without departing from the structure of the present utility model, and these should also be considered as the scope of the present utility model, which does not affect the effect of the implementation of the present utility model and the utility of the patent. The protection scope of the present application shall be subject to the content of the claims, and the description of the specific embodiments and the like in the specification can be used for explaining the content of the claims.

Claims (9)

1. The utility model provides a safe cutting machine, includes the base, swing joint has cutting device on the base, cutting device has open-ended protection casing including the below, is provided with the cutting piece in the protection casing, installs the motor outside the protection casing, and the output shaft of motor stretches into in the protection casing and cutting piece center fixed connection, its characterized in that: the protective cover is internally provided with a braking device capable of stopping the cutting blade suddenly, the protective cover is also fixedly provided with a human body induction sensor, the human body induction sensor is electrically connected with a controller capable of controlling the power-on or power-off of the motor and controlling whether the braking device works or not, the controller is electrically connected with the braking device, and the controller is electrically connected with the motor.

2. The safety cutter of claim 1, wherein: spline gears coaxial with the cutting piece are fixed on the front surface and the back surface of the cutting piece, and each spline gear is provided with a plurality of tooth grooves which are distributed at equal intervals; the inner walls of the protective cover, which are close to the front side and the back side of the cutting piece, are respectively provided with a containing groove for containing the braking device, and the opening of the containing groove faces the tooth slot; the braking device comprises an electromagnet, the electromagnet is fixed at the bottom of the accommodating groove opposite to the tooth groove, one side of the electromagnet, which is close to the tooth groove, is provided with a braking block which is made of magnetic materials and can be clamped into the key groove of the spline gear, a spring which enables the braking block to extend out of the accommodating groove when the electromagnet and the braking block are naturally extended is fixedly connected between the electromagnet and the braking block, and the sum of the length of the compressed spring and the length of the braking block is smaller than the distance between the electromagnet and the opening of the accommodating groove; the electromagnet is electrically connected with the controller.

3. The safety cutter of claim 1, wherein: the base is provided with a safety switch which is started by manual pressing and is lifted to be closed, the safety switch is electrically connected with an external power supply, and the safety switch is electrically connected with the cutting device.

4. A safety cutter according to claim 3, wherein: the cutting device further comprises a support fixed above the base, a rotating shaft penetrates through and is rotationally connected with the support, the axis of the rotating shaft is parallel to the axis of the cutting piece, one end, close to the protective cover, of the rotating shaft is fixedly connected with a movable arm, one end, far away from the protective cover, of the rotating shaft is fixedly connected with a handle, and a limiting plate for limiting the rotation angle of the movable arm is arranged on the support below the movable arm; one end of the movable arm, which is far away from the bracket, is fixedly connected with the motor, and an electric connection end is arranged at the position, close to the bracket, of the movable arm and is electrically connected with the motor; a discharge end and a blank end are arranged at the contact position of the bracket and the rotating track of the power-on end, and the discharge end is electrically connected with the safety switch; the electric connection end is electrically connected with the discharge end when the contact end contacts the discharge end, and the electric connection between the electric connection end and the discharge end is completely disconnected when the upward rotation angle of the movable arm is at the maximum value.

5. The safety cutter of claim 1, wherein: threaded through holes are formed in four corners of the base, a screw is connected with the threaded through holes in a threaded mode, a first knob is fixedly connected to the upper end of the screw, and a base plate is fixedly connected to the lower end of the screw.

6. The safety cutter of claim 5, wherein: and a level gauge is horizontally arranged above the base.

7. The safety cutter of claim 1, wherein: the base is also provided with a cutting groove, the cutting groove is positioned below the cutting piece, one side of the cutting groove, which is positioned in the chip flying-out direction when the cutting piece cuts materials, is provided with a chip blocking groove, and an opening of the chip blocking groove faces the chip flying-out direction.

8. The safety cutter of claim 1, wherein: the upper surface of the base is also fixedly connected with a fixing plate, the fixing plate is positioned behind the cutting sheet, the fixing plate is perpendicular to the upper surface of the base and perpendicular to the surface of the cutting sheet, the upper surface of the base is also provided with a clamping plate, the clamping plate is parallel to the fixing plate, the side surface of the clamping plate, which is far away from the fixing plate, is rotationally connected with a supporting rod, and the supporting rod is horizontally arranged and perpendicular to the side surface of the clamping plate; the base is fixedly connected with a support rod sleeve, a through hole with internal threads is formed in the middle of the support rod sleeve, external threads matched with the internal threads are formed on the outer surface of the support rod, and the support rod penetrates through the through hole and is in threaded connection with the support rod sleeve.

9. The safety cutter of claim 1, wherein: the radius of the sensing range of the human body sensing sensor is 15-20cm.