阅读说明：本技术 一种基于建筑切割机失速保护装置 (Stall protection device based on building cutting machine ) 是由 席晓婕 于 2021-08-16 设计创作，主要内容包括：本发明涉及建筑机械设备技术领域,且公开了一种基于建筑切割机失速保护装置,包括主体、转轴、传动机构、限速机构、调节机构、限位机构和复位机构,所述主体的内侧转动连接有所述转轴,所述转轴的顶部活动连接有所述传动机构并用于挤压所述限速机构传动,所述转轴的内部固定连接有与所述传动机构的底部活动连接的所述限速机构并用于实现所述转轴减速。该基于建筑切割机失速保护装置,通过转轴带动调节机构运行,再通过传动机构与限速机构的配合使用,当转轴转速太快,从而达到了使电路电压增大的效果,使转轴的转动面积增大,有效实现阻碍转轴转动的目的,从而避免切割轮转速过快的情况,有效防止切割机内部零件过度磨损,提高切割机使用寿命。(The invention relates to the technical field of construction machinery equipment, and discloses a stall protection device based on a construction cutting machine, which comprises a main body, a rotating shaft, a transmission mechanism, a speed limiting mechanism, an adjusting mechanism, a limiting mechanism and a reset mechanism, wherein the rotating shaft is rotatably connected to the inner side of the main body, the transmission mechanism is movably connected to the top of the rotating shaft and used for extruding the speed limiting mechanism for transmission, and the speed limiting mechanism movably connected to the bottom of the transmission mechanism is fixedly connected to the inner part of the rotating shaft and used for realizing the speed reduction of the rotating shaft. This based on building cutting machine stall protection device drives adjustment mechanism through the pivot and moves, and rethread drive mechanism uses with the cooperation of speed limiting mechanism, and is too fast when the pivot rotational speed to reached the effect that makes the circuit voltage increase, made the increase of the rotation area of pivot, effectively realized hindering pivot pivoted purpose, thereby avoided the too fast condition of cutting wheel rotational speed, effectively prevented the excessive wearing and tearing of cutting machine internals, improvement cutting machine life.)

1. The utility model provides a stall protection device based on building cutting machine which characterized in that: including main part (1), pivot (2), drive mechanism (3), speed limiting mechanism (4), adjustment mechanism (5), stop gear (6) and canceling release mechanical system (7), the inboard of main part (1) is rotated and is connected with pivot (2), the top swing joint of pivot (2) has drive mechanism (3), the inside fixedly connected with of pivot (2) with the bottom swing joint of drive mechanism (3) speed limiting mechanism (4), the bottom fixedly connected with of pivot (2) adjustment mechanism (5), the equal swing joint in both sides of adjustment mechanism (5) has stop gear (6), the bottom of pivot (2) just is close to the equal fixedly connected with in both sides of adjustment mechanism (5) canceling release mechanical system (7).

2. The stall protection device based on a construction cutter as claimed in claim 1, wherein: drive mechanism (3) include first electromagnet (31), spring (32), piston (33) and magnetic block (34), the top regulation of pivot (2) is connected with first electromagnet (31), the top of pivot (2) just is close to the bottom fixedly connected with of first electromagnet (31) spring (32), the top swing joint of pivot (2) have with the bottom fixedly connected with of spring (32) piston (33), the inside fixedly connected with of piston (33) magnetic block (34).

3. The stall protection device based on a construction cutter as claimed in claim 1, wherein: the speed limiting mechanism (4) comprises a fluid groove (41), a filling groove (42), a speed limiting push rod (43), rubber rings (44) and a placing groove (45), the fluid groove (41) is formed in the main body (1) and is close to the outer side of the rotating shaft (2), the filling groove (42) is formed in the rotating shaft (2), the speed limiting push rod (43) is movably connected with the two sides of the filling groove (42) in the inner portion of the rotating shaft (2), the four rubber rings (44) are fixedly connected with the outer side of the fluid groove (41) in four uniform distribution, and the placing groove (45) is formed in the outer side of the rubber rings (44).

4. The stall protection device based on a construction cutter as claimed in claim 1, wherein: the adjusting mechanism (5) comprises a movable groove (51), a second spring (52), a movable part (53), a roller (54) and a resistance wire (55), the movable groove (51) is formed in the top of the rotating shaft (2), the second spring (52) is fixedly connected to the top of the movable groove (51), the movable part (53) is fixedly connected to the bottom of the second spring (52), the roller (54) is rotatably connected to the inner side of the movable part (53), and the resistance wire (55) is fixedly connected to the back of the bottom of the movable groove (51).

5. The stall protection device based on a construction cutter as claimed in claim 4, wherein: stop gear (6) include second electromagnet (61), spring three (62), stopper (63), magnetic block two (64) and spacing groove (65), the equal fixedly connected with in both sides of moving part (53) second electromagnet (61), the both sides of moving part (53) just are close to the equal fixedly connected with in the outside of second electromagnet (61) spring three (62), the equal swing joint in both sides of moving part (53) have with the outside fixed connection of spring three (62) stopper (63), the inside fixedly connected with of stopper (63) magnetic block two (64), the both sides of activity groove (51) all seted up with the outside joint of stopper (63) spacing groove (65).

6. The stall protection device based on a construction cutter as claimed in claim 1, wherein: reset mechanism (7) include ring channel (71) and stationary contact (72), the both sides of pivot (2) bottom have all been seted up ring channel (71), the outside fixedly connected with of ring channel (71) stationary contact (72).

7. The stall protection device for a construction cutter according to claim 6, wherein: the centrifugal switch is characterized by further comprising a fixing piece (73), a spring IV (74), a centrifugal ball (75) and a movable contact (76), wherein the fixing piece (73) is fixedly connected to the top of the annular groove (71), the spring IV (74) is fixedly connected to the bottom of the fixing piece (73), the centrifugal ball (75) is fixedly connected to the bottom of the spring IV (74), and the movable contact (76) is fixedly connected to the outer side of the movable contact (76).

Technical Field

The invention relates to the technical field of construction machinery equipment, in particular to a stall protection device based on a construction cutting machine.

Background

Along with the development of modern machining industry, to the quality of cutting, the required improvement of precision, also promoting to improving production efficiency, reduction in production cost, have the requirement of high intelligent automatic cutout function, the cutting machine is divided into metal material cutting machine and non-metal material cutting machine from the cutting material, current cutting machine often appears the rotational speed too fast when cutting the material, causes cutting equipment wearing and tearing seriously easily.

The cutting machine moves through the fast pivoted cutting wheel of piece and material contact when using to the realization is cut the purpose of material, but the cutting machine is in cutting process, and the too fast condition of rotational speed appears easily, leads to the wearing and tearing increase of cutting wheel and internals, and the condition that the internals generates heat and sends out the boiling hot has appeared, has reduced the life-span of part, thereby has reduced the life of cutting machine.

Therefore, we propose a stall protection device based on a construction cutter to solve the above problems.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a stall protection device based on a building cutting machine, which has the advantages of effectively realizing the detection of the rotating speed of a cutting wheel, avoiding the condition of excessively high rotating speed of the cutting wheel, effectively prolonging the service life of the cutting machine, and solving the problems that the rotating speed is excessively high easily, the internal parts are easily and severely abraded, and the service life of the cutting machine is reduced when the cutting machine is used.

(II) technical scheme

In order to effectively realize the detection of the rotating speed of the cutting wheel, avoid the condition of excessively high rotating speed of the cutting wheel and effectively improve the service life of the cutting machine, the invention provides the following technical scheme: a stall protection device based on a building cutting machine comprises a main body, a rotating shaft, a transmission mechanism, a speed limiting mechanism, an adjusting mechanism, a limiting mechanism and a resetting mechanism, the inner side of the main body is rotatably connected with the rotating shaft, the top of the rotating shaft is movably connected with the transmission mechanism and is used for extruding the speed limiting mechanism for transmission, the inside of the rotating shaft is fixedly connected with the speed limiting mechanism movably connected with the bottom of the transmission mechanism and used for realizing the speed reduction of the rotating shaft, the bottom of the rotating shaft is fixedly connected with the adjusting mechanism and is used for controlling the output voltage of the transmission mechanism to realize the moving distance, the two sides of the adjusting mechanism are both movably connected with the limiting mechanism and used for limiting the adjusting mechanism to move upwards, the bottom of the rotating shaft is close to the two sides of the adjusting mechanism, and the two sides of the rotating shaft are fixedly connected with the resetting mechanism and used for controlling the limiting mechanism to be separated from the adjusting mechanism.

Further, the transmission mechanism comprises a first electromagnet, a first spring, a first piston and a first magnetic block, the top of the rotating shaft is connected with the first electromagnet in a specified mode, the magnetism generated at the bottom of the first electromagnet is the same as that at the top of the first magnetic block, the first electromagnet plays a role in magnetic transmission, the top of the rotating shaft is close to the bottom of the first electromagnet, the first spring is fixedly connected with the bottom of the first electromagnet, the first spring is an extension spring, the first spring plays a role in contracting the piston towards the top, the top of the rotating shaft is movably connected with the first piston which is fixedly connected with the bottom of the first spring, the bottom of the piston is movably connected with the top of the filling groove, the piston plays a role in extrusion transmission, and the first magnetic block is fixedly connected with the inner portion of the piston.

Furthermore, the speed limiting mechanism comprises a fluid groove, a filling groove, a speed limiting push rod, a rubber ring and a placing groove, the fluid groove is formed in the main body and is close to the outer side of the rotating shaft, viscous liquid is filled in the fluid groove and plays a role in blocking the movement of the speed limiting push rod, the filling groove is formed in the rotating shaft, transmission oil is filled in the filling groove, the speed limiting push rod is movably connected with the two sides of the filling groove in the rotating shaft, the speed limiting push rod plays a role in blocking the rotation of the rotating shaft, the four rubber rings are fixedly connected to the outer side of the fluid groove and are uniformly distributed, the placing groove is formed in the outer side of the rubber ring, and the placing groove plays a role in facilitating the movement of the rubber ring.

Furthermore, the adjusting mechanism comprises a movable groove, a second spring, a movable part, a roller and a resistance wire, the movable groove is formed in the top of the rotating shaft and plays a role in facilitating the movable of the movable part, the second spring is fixedly connected to the top of the movable groove and plays a role in contracting the movable part towards the top, the movable part is fixedly connected to the bottom of the second spring, the movable part is made of a hard high-strength material and plays a role in fixing and transmission, the roller is rotatably connected to the inner side of the movable part and is smaller than the movable part in size, the back of the roller is in rolling contact with the front of the resistance wire, the roller is in contact with the resistance wire to play a role in communicating a circuit, and the resistance wire is fixedly connected to the back of the bottom of the movable groove, the resistance value at the top of the resistance wire is larger than the resistance value at the bottom of the resistance wire, and the resistance wire plays a role in changing the voltage of a circuit.

Further, the limiting mechanism comprises a second electromagnet, a spring III, a limiting block, a magnetic block II and a limiting groove, the two sides of the moving piece are fixedly connected with the second electromagnets, the magnetism generated at the outer sides of the second electromagnets is opposite to that of the inner sides of the magnetic blocks, the second electromagnet plays a role in magnetic transmission, the two sides of the moving part and the outer side close to the second electromagnet are fixedly connected with a third spring, the third spring is a compression spring and plays a role in moving the limiting block outwards, both sides of the moving part are movably connected with the limiting blocks fixedly connected with the outer sides of the springs III, the outer side of the limiting block is matched with the limiting groove, the limiting block plays a limiting role, the inner portion of the limiting block is fixedly connected with the second magnetic block, and the limiting grooves clamped with the outer sides of the limiting block are formed in the two sides of the movable groove.

Further, canceling release mechanical system includes ring channel and stationary contact, the both sides of pivot bottom have all been seted up the ring channel, the longest distance perpendicular to of ring channel central line the center of pivot, the ring channel plays to be convenient for the effect of centrifugal ball activity, the outside fixedly connected with of ring channel the stationary contact.

Furthermore, the reset mechanism further comprises a fixing piece, a spring IV, a centrifugal ball and a movable contact, wherein the fixing piece is fixedly connected to the top of the annular groove, the spring IV is fixedly connected to the bottom of the fixing piece, the spring IV is an extension spring, the spring IV plays a role in contracting the centrifugal ball towards the top, the centrifugal ball is fixedly connected to the bottom of the spring IV, the movable contact is fixedly connected to the outer side of the movable contact, the movable contact is in contact connection with the stationary contact, and the movable contact and the stationary contact are in contact to play a role in communicating a circuit.

(III) advantageous effects

Compared with the prior art, the invention provides a stall protection device based on a building cutting machine, which has the following beneficial effects:

1. this based on building cutting machine stall protection device, drive adjustment mechanism through the pivot and move, rethread drive mechanism uses with speed limiting mechanism's cooperation, it is too fast when the pivot rotational speed, thereby it is more far away to drive the moving part to the outside throw-out distance, thereby the effect that makes the circuit voltage increase has been reached, the rotation area increase of messenger's pivot, effectively realize hindering pivot pivoted purpose, thereby the condition of having avoided the cutting wheel rotational speed too fast, effectively prevent the excessive wearing and tearing of cutting machine internals, cutting machine life has been improved.

2. This based on building cutting machine stall protection device, drive the canceling release mechanical system operation through the pivot, rethread canceling release mechanical system uses with stop gear's cooperation, when pivot stall, under spring four's effect, thereby drive the centrifugal ball and contract to the top, make movable contact and stationary contact, thereby reached and driven the stopper to the inboard effect of contracting, effectively realize the moving part and break away from fixed purpose, the initial condition at top is got back to the moving part under spring two's effect, do not hinder cutting machine next time work, realize automatic control's effect.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an enlarged view of a portion A of FIG. 1;

FIG. 3 is an enlarged view of a portion B of FIG. 1;

FIG. 4 is a schematic view of the deceleration structure of the rotating shaft according to the present invention.

In the figure: 1. a main body; 2. a rotating shaft; 3. a transmission mechanism; 4. a speed limiting mechanism; 5. an adjustment mechanism; 6. a limiting mechanism; 7. a reset mechanism; 31. a first electromagnet; 32. a first spring; 33. a piston; 34. a first magnetic block; 41. a fluid tank; 42. filling the groove; 43. a speed-limiting push rod; 44. a rubber ring; 45. a placement groove; 51. a movable groove; 52. a second spring; 53. a movable member; 54. a roller; 55. a resistance wire; 61. a second electromagnet; 62. a third spring; 63. a limiting block; 64. a second magnetic block; 65. a limiting groove; 71. an annular groove; 72. a stationary contact; 73. a fixing member; 74. a fourth spring; 75. a centrifugal ball; 76. and a movable contact.

Detailed Description

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

The first embodiment is as follows:

referring to fig. 1, 2 and 4, a stall protection device based on a construction cutter comprises a main body 1, a rotating shaft 2, a transmission mechanism 3 and a speed limiting mechanism 4, the inner side of the main body 1 is rotatably connected with a rotating shaft 2, the top of the rotating shaft 2 is movably connected with a transmission mechanism 3 and used for transmission of an extrusion speed limiting mechanism 4, the transmission mechanism 3 comprises a first electromagnet 31, a first spring 32, a piston 33 and a first magnetic block 34, the top of the rotating shaft 2 is connected with the first electromagnet 31 in a specified mode, magnetism generated at the bottom of the first electromagnet 31 is the same as that at the top of the first magnetic block 34, the first electromagnet 31 plays a role in magnetic transmission, the bottom of the top of the rotating shaft 2, close to the first electromagnet 31, is fixedly connected with the first spring 32, the first spring 32 is an extension spring, and the first spring 32 plays a role in contracting the piston 33 towards the top.

The top of the rotating shaft 2 is movably connected with a piston 33 fixedly connected with the bottom of a spring I32, the piston 33 is made of hard rubber materials, the bottom of the piston 33 is movably connected with the top of a filling groove 42, the piston 33 plays a role in extrusion transmission, a first magnetic block 34 is fixedly connected inside the piston 33, a speed limiting mechanism 4 movably connected with the bottom of the transmission mechanism 3 is fixedly connected inside the rotating shaft 2 and used for realizing speed reduction of the rotating shaft 2, the speed limiting mechanism 4 comprises a fluid groove 41, a filling groove 42, a speed limiting push rod 43, a rubber ring 44 and a placing groove 45, the fluid groove 41 is formed in the main body 1 and close to the outer side of the rotating shaft 2, the fluid groove 41 is annular, the size of the fluid groove 41 is larger than that of the rotating shaft 2, viscous liquid is filled in the fluid groove 41 and plays a role in blocking the movement of the speed limiting push rod 43, the filling groove 42 is formed in the rotating shaft 2, the inside of the filling groove 42 is filled with transmission oil, the inside of the rotating shaft 2 is movably connected with a speed-limiting push rod 43 which is movably connected with both sides of the filling groove 42, the outer side of the speed-limiting push rod 43 is fixedly connected with a blocking ball, the material of the speed-limiting push rod 43 is hard high-strength material, and the speed-limiting push rod 43 plays a role in blocking the rotating of the rotating shaft 2.

The outer side of the fluid groove 41 is fixedly connected with four rubber rings 44 which are uniformly distributed, the rubber rings 44 are made of high-elasticity polymer materials, the rubber rings 44 are made of arc-shaped materials, the outer side of the rubber rings 44 is provided with a placing groove 45, the placing groove 45 is arc-shaped, the placing groove 45 plays a role in facilitating movement of the rubber rings 44, the bottom of the rotating shaft 2 is fixedly connected with an adjusting mechanism 5 and used for controlling the output voltage of the transmission mechanism 3 to achieve the size of the moving distance, the adjusting mechanism 5 comprises a movable groove 51, a second spring 52, a movable piece 53, a roller 54 and a resistance wire 55, the top of the rotating shaft 2 is provided with a movable groove 51, the movable groove 51 is rectangular, the movable groove 51 plays a role in facilitating movement of the movable piece 53, the second spring 52 is fixedly connected to the top of the movable groove 51, the number of the second springs 52 is two, the second spring 52 is an extension spring, and the second spring 52 plays a role in contracting the movable piece 53 towards the top, the bottom fixedly connected with moving part 53 of spring two 52, the material of moving part 53 is stereoplasm high strength material, moving part 53 plays fixed and driven effect, the inboard rotation of moving part 53 is connected with gyro wheel 54, the shape of gyro wheel 54 is the ring form and the size of gyro wheel 54 is less than the size of moving part 53, the back of gyro wheel 54 and the front rolling contact of resistance wire 55, gyro wheel 54 and the effect of resistance wire 55 contact intercommunication circuit play, the back fixedly connected with resistance wire 55 of activity groove 51 bottom, the resistance at resistance wire 55 top is greater than the resistance of resistance wire 55 bottom, resistance wire 55 and first electromagnet 31 electric connection, resistance wire 55 plays the effect of changing the circuit voltage.

The two sides of the adjusting mechanism 5 are movably connected with a limiting mechanism 6 and used for limiting the adjusting mechanism 5 to move upwards, the limiting mechanism 6 comprises a second electromagnet 61, a spring III 62, a limiting block 63, a magnetic block II 64 and a limiting groove 65, the two sides of the moving member 53 are fixedly connected with the second electromagnet 61, the magnetism generated on the outer side of the second electromagnet 61 is opposite to the magnetism generated on the inner side of the magnetic block II 64, the second electromagnet 61 plays a role in magnetic transmission, the spring III 62 is fixedly connected on the outer sides of the two sides of the moving member 53 and close to the second electromagnet 61, the spring III 62 is a compression spring, the spring III 62 plays a role in moving the limiting block 63 towards the outer side, the two sides of the moving member 53 are movably connected with the limiting block 63 fixedly connected with the outer side of the spring III 62, the material of the limiting block 63 is hard high-strength material, the outer side of the limiting block 63 is matched with the limiting groove 65, and the limiting block 63 plays a limiting role, the inside fixedly connected with magnet two 64 of stopper 63, the spacing groove 65 with the outside joint of stopper 63 is all seted up to the both sides of activity groove 51, and the bottom of pivot 2 and the equal fixedly connected with canceling release mechanical system 7 in both sides that are close to adjustment mechanism 5 are used for controlling stop mechanism 6 and break away from the fixed of adjusting mechanism 5.

Example two:

referring to fig. 1-4, a stall protection device based on a building cutting machine comprises a main body 1, a rotating shaft 2, a transmission mechanism 3, a speed limiting mechanism 4, an adjusting mechanism 5, a limiting mechanism 6 and a reset mechanism 7, wherein the rotating shaft 2 is rotatably connected to the inner side of the main body 1, the transmission mechanism 3 is movably connected to the top of the rotating shaft 2 and used for extruding the speed limiting mechanism 4 for transmission, the transmission mechanism 3 comprises a first electromagnet 31, a first spring 32, a piston 33 and a first magnet 34, the top of the rotating shaft 2 is connected with the first electromagnet 31 in a prescribed manner, the magnetism generated at the bottom of the first electromagnet 31 is the same as that at the top of the first magnet 34, the first electromagnet 31 plays a role of magnetic transmission, the first spring 32 is fixedly connected to the top of the rotating shaft 2 and the bottom of the first electromagnet 31, the first spring 32 is an extension spring, the first spring 32 plays a role of contracting the piston 33 to the top, the top of the rotating shaft 2 is movably connected with the piston 33 fixedly connected to the bottom of the first spring 32, the piston 33 is made of hard rubber material, the bottom of the piston 33 is movably connected with the top of the filling groove 42, and the piston 33 plays a role in extrusion transmission.

The inside of the piston 33 is fixedly connected with a first magnetic block 34, the inside of the rotating shaft 2 is fixedly connected with a speed-limiting mechanism 4 movably connected with the bottom of the transmission mechanism 3 and used for realizing the speed reduction of the rotating shaft 2, the speed-limiting mechanism 4 comprises a fluid groove 41, a filling groove 42, a speed-limiting push rod 43, a rubber ring 44 and a placing groove 45, the fluid groove 41 is arranged inside the main body 1 and close to the outer side of the rotating shaft 2, the fluid groove 41 is annular, the size of the fluid groove 41 is larger than that of the rotating shaft 2, viscous liquid is filled inside the fluid groove 41 and plays a role of obstructing the movement of the speed-limiting push rod 43, the filling groove 42 is arranged inside the rotating shaft 2, transmission oil is filled inside the filling groove 42, the speed-limiting push rod 43 movably connected with the two sides of the filling groove 42 is movably connected inside the rotating shaft 2, an obstructing ball is fixedly connected with the outer side of the speed-limiting push rod 43 and is made of a hard high-strength material, the speed-limiting push rod 43 plays a role in blocking the rotation of the rotating shaft 2, the four rubber rings 44 which are uniformly distributed are fixedly connected to the outer side of the fluid groove 41, the rubber rings 44 are made of high-elasticity polymer materials, the rubber rings 44 are made of arc-shaped materials, the outer side of each rubber ring 44 is provided with a placing groove 45, the placing groove 45 is arc-shaped, and the placing groove 45 plays a role in facilitating the movement of the rubber rings 44.

The bottom of the rotating shaft 2 is fixedly connected with an adjusting mechanism 5 and used for controlling the output voltage of the transmission mechanism 3 to realize the size of the moving distance, the adjusting mechanism 5 comprises a movable groove 51, a second spring 52, a movable part 53, a roller 54 and a resistance wire 55, the top of the rotating shaft 2 is provided with the movable groove 51, the movable groove 51 is rectangular, the movable groove 51 plays a role in facilitating the movement of the movable part 53, the top of the movable groove 51 is fixedly connected with the second spring 52, the two springs 52 are two in number and the second spring 52 is an extension spring, the second spring 52 plays a role in contracting the movable part 53 to the top, the bottom of the second spring 52 is fixedly connected with the movable part 53, the material of the movable part 53 is a hard high-strength material, the movable part 53 plays a role in fixing and transmission, the inner side of the movable part 53 is rotatably connected with the roller 54, the roller 54 is annular and the size of the roller 54 is smaller than that of the movable part 53, the back of gyro wheel 54 and the front rolling contact of resistance wire 55, gyro wheel 54 and the effect of resistance wire 55 contact and play the intercommunication circuit, the back fixedly connected with resistance wire 55 of activity groove 51 bottom, the resistance at resistance wire 55 top is greater than the resistance at resistance wire 55 bottom, resistance wire 55 and first electromagnet 31 electric connection, and resistance wire 55 plays the effect of changing circuit voltage.

Both sides of the adjusting mechanism 5 are movably connected with a limiting mechanism 6 for limiting the adjusting mechanism 5 to move upwards, the limiting mechanism 6 comprises a second electromagnet 61 and a third spring 62, the stopper 63, two magnet blocks 64 and limiting groove 65, the equal fixedly connected with second electromagnet 61 in both sides of moving part 53, the magnetism that produces in the second electromagnet 61 outside is opposite with the inboard magnetism of two magnet blocks 64, second electromagnet 61 plays the driven effect of magnetism, the equal fixedly connected with spring three 62 in both sides of moving part 53 and the outside that is close to second electromagnet 61, spring three 62 is compression spring, spring three 62 plays the effect of moving stopper 63 to the outside, the equal swing joint in both sides of moving part 53 has stopper 63 with spring three 62's outside fixed connection, the material of stopper 63 is stereoplasm high strength material and stopper 63's the outside and limiting groove 65 looks adaptation, stopper 63 plays spacing effect.

The inside of the limiting block 63 is fixedly connected with a second magnetic block 64, both sides of the movable groove 51 are respectively provided with a limiting groove 65 clamped with the outside of the limiting block 63, both sides of the bottom of the rotating shaft 2 and close to the adjusting mechanism 5 are respectively and fixedly connected with a reset mechanism 7 and used for controlling the limiting mechanism 6 to be separated from fixing the adjusting mechanism 5, the reset mechanism 7 comprises an annular groove 71, a fixed contact 72, a fixing member 73, a fourth spring 74, a centrifugal ball 75 and a movable contact 76, both sides of the bottom of the rotating shaft 2 are respectively provided with the annular groove 71, the outer ring of the annular groove 71 is arc-shaped, the inner ring of the annular groove 71 is irregular, the longest distance of the central line of the annular groove 71 is vertical to the center of the rotating shaft 2, the annular groove 71 plays a role in facilitating the movement of the centrifugal ball 75, the outside of the annular groove 71 is fixedly connected with the fixed contact 72, the top of the annular groove 71 is fixedly connected with the fixing member 73, and the bottom of the fixing member 73 is fixedly connected with the fourth spring 74, the spring IV 74 is an extension spring, the spring IV 74 plays a role in contracting the centrifugal ball 75 towards the top, the centrifugal ball 75 is fixedly connected to the bottom of the spring IV 74, a movable contact 76 is fixedly connected to the outer side of the movable contact 76, the movable contact 76 is in contact connection with the fixed contact 72, the movable contact 76 is electrically connected with the second electromagnet 61, and the movable contact 76 is in contact with the fixed contact 72 to play a role in communicating a circuit.

The working principle is as follows: before the operation, the rotating shaft 2 does not rotate, under the action of the second spring 52, the moving member 53 is pulled to be located at the innermost side of the rotating shaft 2 and to be located at the top of the movable groove 51, during normal operation, the rotating shaft 2 rotates and under the action of centrifugal force, the moving member 53 is driven to pull the second spring 52 to move towards the outer side of the rotating shaft 2, at this time, the moving member 53 is located at the middle position of the movable groove 51, and under the action of the third spring 62 ejecting the limiting block 63, the limiting block 63 is in matched and clamped connection with the limiting groove 65, the moving member 53 is effectively prevented from returning to the top, when the rotating speed of the rotating shaft 2 is too fast, the centrifugal force of the rotating shaft 2 is increased, so that the outward throwing distance of the moving member 53 is increased, at this time, the roller 54 is in rolling contact with the resistance wire 55, the first electromagnet 31 is in circuit communication, the farther the rolling distance of the roller 54 towards the bottom of the movable groove 51 is, the resistance wire 55 is smaller, the circuit voltage of the first electromagnet 31 is larger, because the magnetism generated at the bottom of the first electromagnet 31 is the same as that at the top of the first magnetic block 34, the principle that the same magnetism repels each other is utilized, so that the effect of repelling the first magnetic block 34 and driving the piston 33 to move towards the bottom is achieved, the purpose of extruding the transmission oil in the filling groove 42 is effectively achieved, the pressure in the filling groove 42 is increased, the speed-limiting push rod 43 is pushed to extend towards two sides, the rotating area of the rotating shaft 2 is increased, the contact area of the speed-limiting push rod and the viscous liquid in the fluid groove 41 is increased, the effect of hindering the rotating shaft 2 from rotating is achieved, the purpose of reducing the rotating speed of the rotating shaft 2 is achieved, the purpose of reducing the rotating speed of the cutting wheel is effectively achieved, the excessive abrasion of internal parts of the cutting machine caused by the excessively high rotating speed of the cutting wheel is avoided, and the service life of the cutting machine is prolonged;

when the rotating shaft 2 rotates, under the action of centrifugal force, the four extension springs 74 of the centrifugal balls 75 are simultaneously driven to throw out towards the outer side of the rotating shaft 2, so that the centrifugal balls 75 slide around the inner side groove of the annular groove 71, and the centrifugal balls 75 are positioned at the bottommost part of the annular groove 71. When the rotating shaft 2 stops rotating, under the action of the spring IV 74, the centrifugal ball 75 is pulled to contract towards the top of the annular groove 71, at this time, the centrifugal ball 75 slides through the outer side of the annular groove 71, the movable contact 76 is contacted with the fixed contact 72, the second electromagnet 61 is energized and magnetized, because the magnetism generated at the outer side of the second electromagnet 61 is opposite to the magnetism at the inner side of the magnetic block II 64, the effect of adsorbing the magnetic block II 64 and driving the limiting block 63 to move towards the inner side compression spring III 62 is achieved by utilizing the principle of opposite magnetic attraction, the purpose of separating the movable piece 53 from the fixed state is effectively achieved, at this time, under the action of the spring II 52, the movable piece 53 is pulled back to the top, the movable piece 53 returns to the initial state, and under the action of the spring IV 74, the centrifugal ball 75 returns to the initial state at the top, the movable contact 76 is disconnected with the fixed contact 72, the second electromagnet 61 is de-energized and de-energized, so as to achieve a working process, the next work of the cutting machine is not hindered, and the effect of automatic control is achieved.

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.