An angle grinder and motor thereof

Abstract

The application discloses an angle grinder and a motor thereof, which comprises a shell, a speed reducer, a driving motor and a transmission device, the speed reducer is rotationally arranged in the shell, a polishing piece is assembled on the speed reducer, the driving motor is arranged in the shell, and the driving motor and the speed reducer are connected in power through the transmission device, and the transmission device comprises a locking block. The angle grinder and the motor thereof can automatically trigger the anti-torsion when the polishing piece is clamped and the angle grinding device reacts a large torsion to an operator, so that the speed reducer shell is unlocked, the force transmitted to the speed reducer shell by the driving motor drives the speed reducer shell to rotate, the torsion is avoided from being transmitted to the operator, the anti-torsion effect is achieved, the safety of the angle grinding device is improved, and the core competitiveness of the angle grinding device is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of angle grinders, in particular to an angle grinder and a motor thereof. BACKGROUND

[0002] The angle grinder is also called a grinding machine or a disc grinder, and is mainly used for cutting and grinding. During the cutting or grinding process, the grinding disc may be stuck. At this time, the hand holding the grinder may move along with the tail of the angle grinder, and the operator may be sprained. At the same time, the grinder is always in an open state during the twisting process. Therefore, after the tail of the angle grinder touches an obstacle, the grinding disc may break free from the stuck position, and then the grinding disc may move towards the operator, and a safety accident may occur.

[0003] As disclosed in CN213225581U, a protection cover is provided on the grinder to protect the personal safety of the operator. However, the phenomenon of spraining the operator when the grinder is stuck cannot be solved. SUMMARY

[0004] The present application provides an angle grinder and a motor thereof to solve the problems in the prior art.

[0005] To solve the above technical problems, the present application provides an angle grinder and a motor thereof. The angle grinder comprises a shell, a speed reducer, a driving motor, and a transmission device. The speed reducer is rotationally arranged in the shell, and a grinding disc is assembled on the speed reducer. The driving motor is arranged in the shell. The driving motor and the speed reducer are connected in power through the transmission device. The transmission device comprises a locking block. A groove adapted to the locking block is formed on the outer wall of the speed reducer. The locking block is elastically guided and slidably arranged in the shell. The front end of the locking block elastically abuts against the groove to elastically lock the speed reducer. When the torsion received by the speed reducer is greater than the locking force, the speed reducer rotates, and the locking block elastically retreats.

[0006] The beneficial effect is that when the grinding disc is stuck and the angle grinder device applies a large torsion to the operator, the angle grinder device is automatically triggered to prevent the torsion, the speed reducer shell is unlocked, the force transmitted from the driving motor to the speed reducer drives the speed reducer shell to rotate, and the torsion is prevented from being transmitted to the operator.

[0007] In the above scheme, preferably, a first gear is arranged on the driving motor and guided to slide. The first gear is meshed with or separated from a matching gear on the transmission device by sliding forward and backward. The first gear moves forward and backward along with the locking block.

[0008] The beneficial effect is that the power connection between the driving motor and the speed reducer is disconnected at the first time when the speed reducer shell is unlocked.

[0009] Preferably, the locking block is provided with a ring buckle, the first gear is provided with a ring groove, and the first gear is arranged on the ring buckle through the ring groove, and the ring groove limits the ring buckle forward and backward.

[0010] Preferably, the shell is provided with a guide shaft, the locking block is arranged on the guide shaft in a guided sliding manner, one end of the guide shaft is provided with a fixed plate, one end of the first elastic member abuts against the fixed plate, and the other end abuts against the locking block.

[0011] Preferably, the shell is provided with a holding portion, the holding portion is provided with a holding position sensing device, the other end of the guide shaft is provided with an electromagnet, the locking block is provided with a magnetic attraction member, the electromagnet is electrified to provide a magnetic attraction force for the magnetic attraction member, the locking force of the locking block on the ring groove is increased, and the position sensing device is used to monitor the holding position of the operator, the magnetic attraction force of the electromagnet is adjusted according to the holding position, and the locking force of the locking block on the ring groove is adjusted.

[0012] Preferably, the farther the holding position of the operator is from the decelerating member, the smaller the current supplied to the electromagnet is.

[0013] The beneficial effects are that the locking force of the locking block on the groove can be automatically adjusted according to the holding position of the operator, the torsion of the anti-twist trigger is smaller when the holding position is farther from the grinding disc, and the operator is protected.

[0014] Preferably, the position sensing device is a switch member, the switch member is arranged on the holding portion of the angle grinder device in a direction from the tail portion of the angle grinder device to the grinding disc mounting position, and the holding position is sensed by the switch member and compared with a stored position point to identify the holding position.

[0015] Preferably, the guide shaft is further provided with a pressing switch member at a position below the guide shaft, and the locking block abuts against the pressing switch member when sliding out of the ring groove, so as to control the power-off of the driving motor.

[0016] Preferably, when the pressing switch member is pressed, the control unit of the angle grinder device controls the direction of the current supplied to the electromagnet to be reversed, so that the magnetic pole of the electromagnet is changed, and a magnetic repulsion force of the magnetic attraction member is provided to the first elastic member.

[0017] A motor of an angle grinder, the driving motor comprises an energy-saving motor, the energy-saving motor is a double-shaft motor, a dust cover is arranged on the body of the energy-saving motor, and fan blades are arranged on the double shafts, and the fan blades on one side of the shaft are located outside the dust cover, and the fan blades on the other side of the shaft are located inside the dust cover.

[0018] Its beneficial effect lies in, two-way suction before and after, so that air can flow through the energy-saving motor, and then play the role of rapid heat dissipation, while the two fans are located inside and outside the dust cover, thereby reducing the interference of the dust cover to the air flow, and the dust cover is used for dust prevention of the energy-saving motor.

[0019] The beneficial effect of the present application is that the present application provides an angle grinder and its motor, which can automatically trigger the anti-torque when the grinding piece is clamped and the angle grinding device reacts a larger torque to the operator, so that the reducer housing is unlocked, and then the force transmitted to the reducer housing by the driving motor drives the reducer housing to rotate, thereby avoiding transmitting the torque to the operator, and then playing the anti-torque effect, improving the safety of the angle grinding device, and improving the core competitiveness of the angle grinding device. BRIEF DESCRIPTION OF DRAWINGS

[0020] Figure 1 The present application is a schematic diagram.

[0021] Figure 2 The present application is a schematic diagram.

[0022] Figure 3 The present application is a schematic diagram.

[0023] Figure 4 The present application is a schematic diagram.

[0024] Figure 5 The present application is a schematic diagram.

[0025] Figure 6 The present application is a schematic diagram.

[0026] Figure 7 The present application is a schematic diagram. DETAILED DESCRIPTION

[0027] The present application will be further described in detail below in combination with the drawings and specific embodiments:

[0028] Embodiment 1:

[0029] Referring to Figures 1-6 An angle grinder and its motor, comprising a shell 1, a reducer 2, a driving motor 3, a transmission device 4 and a position sensing device 5, the reducer 2, the driving motor 3 and the transmission device 4 are arranged in the shell 1, the reducer 2 housing is circular design, and is rotatably arranged in the shell 1, and the input end and the output end are arranged thereon, the input end is power connected with the transmission device 4, and the output end is used to install the grinding piece.

[0030] Wherein when the shell of the speed reducer 2 is fixed, the power input from the input end is output from the output end to drive the polishing piece to rotate, and when the shell of the speed reducer 2 is unlocked, the power input from the input end directly drives the speed reducer 2 to rotate as a whole, and the speed reduction assembly inside the speed reducer 2 does not work for power transmission.

[0031] The shell 1 is also provided with a guide shaft 11, which is a hexagonal shaft. The transmission device 4 includes a locking block 41 and a transmission gear set 42. The locking block 41 is slidingly arranged on the guide shaft 11, and a first elastic member 12 is sleeved on the guide shaft 11. One end of the first elastic member 12 abuts against the mounting plate at the rear end of the guide shaft 11, and the other end abuts against the locking block 41. A plurality of grooves 21 are uniformly formed in the circumference of the shell of the speed reducer 2. The front end of the locking block 41 is provided with a locking head 413, which is adapted to the grooves 21. Under the action of the first elastic member 12, the locking head 413 elastically abuts against the grooves 21, thereby elastically locking the shell of the speed reducer 2 to enable it to transmit power. The locking head 413 is slidingly arranged left and right, and an inclined chamfer is arranged around the contact surface of the locking head 413 and the grooves 21, thereby enabling the locking head 413 to slide out of the grooves 21.

[0032] The driving motor 3 includes an energy-saving motor, which is a double-shaft energy-saving motor. The energy-saving motor is fixedly arranged in the shell 1, and a dust cover 32 is sleeved on the energy-saving motor. The front and rear shafts of the energy-saving motor are both rotatably arranged on the dust cover 32. A first fan blade 33 is arranged on the rear shaft of the energy-saving motor and located outside the dust cover 32. A second fan blade 34 is arranged on the front shaft of the energy-saving motor and located inside the dust cover 32. When the energy-saving motor rotates, the first fan blade 33 and the second fan blade 34 rotate synchronously. The first fan blade 33 blows air towards the dust cover 32, and the second fan blade 34 blows the air inside the dust cover 32 out of the front end of the dust cover 32, thereby circulating the air inside the dust cover 32. This reduces the obstruction of the dust cover to the air flow, enables the driving motor 3 to quickly dissipate heat and prevent dust from entering the internal energy-saving motor, and enables the driving motor 3 to be normally used in harsh environments.

[0033] A first gear 31 is slidingly arranged on the front shaft of the energy-saving motor and located outside the dust cover 32. An annular groove 311 is formed in the first gear 31. An annular buckle 411 is arranged on the locking block 41 and arranged in the annular groove 311 of the first gear 31. When the locking block 41 moves forward and backward, the first gear 31 moves forward and backward together. Since the annular groove 311 and the annular buckle 411 are circular in design, the rotation of the first gear 31 does not affect the locking block 41.

[0034] Wherein the locking head 413 of the locking block 41 is on the top of the groove 21, the outer shell of the speed reducer 2 is elastically locked, at this time the first gear 31 is engaged with the gear in the transmission gear set 42, the transmission gear set 42 is in power connection with the input end on the speed reducer 2, so the driving motor 3 rotates, and the power transmission of the transmission gear set 42 drives the output end of the speed reducer 2 to rotate, that is, drives the polishing piece to rotate.

[0035] When the polishing piece is stuck during rotation, the operator holds the shell 1 of the polishing device, and then has a limiting force on the shell 1. When the sticking occurs, the polishing piece stops rotating, and the speed reducer 2 as a whole generates a larger torsional force. When the torsional force is greater than the frictional force of the locking block 41 on the outer shell, the outer shell of the speed reducer 2 rotates under the action of the torsional force, the groove 21 on the outer shell moves out of the position where the locking block 41 is located, and then the locking block 41 moves backward, driving the first gear 31 to move backward together, so that the first gear 31 is disengaged from the gear on the transmission gear set 42, and then the power transmission is disconnected, so that the driving force for driving the polishing piece to rotate disappears, thereby achieving the function of preventing the operator from being twisted.

[0036] The shell 1 is provided with a holding portion 14, the position sensing device 5 includes a control unit and an identification unit, the identification unit includes a switch element, the switch element is a photoelectric sensor or a press sensor, a plurality of switch elements are uniformly laid on the holding portion 14 in sequence, and each switch element has an independent position code. When the operator holds the holding portion 14, the photoelectric sensor at the holding position is blocked or the press sensor is pressed, and then the sensor that recognizes the signal transmits the signal to the control unit. The control unit compares the signal position with the original stored signal position to determine which position of the signal recognition area is located in the signal collection area. The other end of the guide shaft 11 is provided with an electromagnet 13, that is, the end close to the speed reducer 2. The locking block 41 is provided with a magnetic attraction element 412. The electromagnet 13 is energized to provide a magnetic attraction force to the magnetic attraction element 412, thereby increasing the pressure of the locking block 41 on the groove 21. The greater the pressure, the greater the friction between the locking block 41 and the groove 21.

[0037] The operator holds the angle grinding device as a force point, the center of the polishing piece as a rotating point, and the polishing position of the edge of the polishing piece as a force point, forming a lever. When the polishing piece is stuck, the lever force is reversed, and the position point of the operator holding the angle grinding device is the force point. Therefore, under the action of the lever, when the polishing piece is stuck, the farther away from the center of the polishing piece, the greater the swing force of the polishing device on the hand, and thus it is easier to be injured. Therefore, the disengagement torque needs to be adjusted according to the different holding positions of the operator, and the operator is further protected.

[0038] Wherein the position sensing device 5 identifies the position of the operator holding, the control unit compares the holding position first signal source with the original stored signal position, and according to the judgment of the holding position, the control unit stores the current size corresponding to each signal position, and then automatically matches the current of the electromagnet 13 according to the position of the operator holding. The farther away from the speed reducer 2, the greater the corresponding current, and the farther away from the speed reducer 2, the smaller the friction of the locking block 41 to the groove 21, and the farther away from the speed reducer 2, the smaller the torque of the operator holding, thereby protecting the operator.

[0039] The working principle or method of use is as follows:

[0040] In the initial state, the locking head 413 is in contact with the groove 21, and the outer shell of the speed reducer 2 is elastically locked. At this time, the first gear 31 is engaged with the gear in the transmission gear set 42, and the transmission gear set 42 is in power connection with the input end of the speed reducer 2. Therefore, the driving motor 3 rotates, and the power transmission of the transmission gear set 42 drives the output end of the speed reducer 2 to rotate, that is, the polishing piece rotates.

[0041] At this time, the device is started, that is, the driving motor 3 and the electromagnet 13 are powered on, and the operator holds the shell 1 to polish or cut the workpiece. The sensing device 5 identifies the position of the operator holding, and the control unit automatically matches the current of the electromagnet 13 according to the position of the operator holding. The farther away from the speed reducer 2, the greater the corresponding current, and the farther away from the speed reducer 2, the smaller the friction of the locking block 41 to the groove 21.

[0042] When the jam occurs, the polishing piece stops rotating, and at this time the speed reducer 2 generates a large torque as a whole. When the torque is greater than the friction of the locking block 41 to the outer shell, the outer shell of the speed reducer 2 rotates under the action of the torque, and the groove 21 on the outer shell rotates out of the position of the locking block 41. At this time, the outer shell of the speed reducer 2 rotates, and the torque generated by the jam disappears with the rotation of the outer shell of the speed reducer 2, thereby protecting the operator and achieving the function of preventing the torque.

[0043] At the same time, the device automatically adjusts the torque of the operator holding, and the farther away from the speed reducer 2, the smaller the torque, thereby further protecting the operator.

[0044] Example 2:

[0045] Compared with example 1, the difference is that the electromagnet 13 and the control unit are the same. See Figures 1-5 and Figure 7The electromagnet 13 can generate different magnetic poles after passing positive and reverse current, and the control unit can control the current direction input to the electromagnet 13. A press switch 15 is arranged below the guide shaft 11. When the locking block 41 slides out of the ring groove 311, the locking block 41 presses the press switch 15 to control the power-off of the driving motor 3, so as to ensure that the driving motor 3 no longer provides power to the speed reducer 2, further improving the safety of the lifting device. When the press switch 13 is pressed, the control unit controls the input of reverse current to the electromagnet 13, so that the electromagnet 13 generates a reverse magnetic pole, and the magnetic attraction of the magnetic attraction piece 412 becomes magnetic repulsion. The current is the maximum, and the magnetic repulsion is sufficient to deform the first elastic member 12 and push the locking block 41 away from the recess 21.

[0046] After the locking block 41, the driving motor 3 is powered off for the first time, and the locking block 41 is separated from the recess 21 under the action of the magnetic force, so as to automatically unlock the shell of the speed reducer 2, and ensure that the subsequent state is in the unlocked state after the first separation.

[0047] The above embodiments are only used to illustrate the technical solutions of the present application, but not to limit it; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that the technical solutions recorded in the foregoing embodiments can be modified, or some technical features can be replaced by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An angle grinder, characterized in that: It includes a housing (1), a reducer (2), a drive motor (3) and a transmission device (4). The reducer (2) is rotatably disposed inside the housing (1), and the grinding disc is mounted on the reducer (2). The drive motor (3) is disposed inside the housing (1), and the drive motor (3) and the reducer (2) are connected by the transmission device (4). The transmission device (4) includes a locking block (41). A groove (21) adapted to the locking block (41) is provided on the outer wall of the speed reducer (2). The locking block (41) is elastically guided and slidably disposed in the housing (1). Its front end elastically contacts the groove (21) to elastically lock the speed reducer (2). When the torque on the speed reducer (2) is greater than the locking force, the speed reducer (2) rotates and the locking block (41) elastically retracts. The drive motor (3) is guided and slidably equipped with a first gear (31). The first gear (31) slides back and forth and engages or disengages with the cooperating gear on the transmission device (4). The first gear (31) moves back and forth together with the locking block (41). The housing (1) is provided with a guide shaft (11), and the locking block (41) is slidably arranged on the guide shaft (11). One end of the guide shaft is in contact with one end of the first elastic element (12) on the fixing plate at one end, and the other end is in contact with the locking block (41). The housing (1) is provided with a gripping part, and a gripping position sensing device (5) is provided on the gripping part. An electromagnet (13) is provided on the other end of the guide shaft (11). A magnetic suction element (412) is provided on the locking block (41). When the electromagnet (13) is energized, it is used to provide a magnetic attraction force to the magnetic suction element (412) to increase the locking force of the locking block (41) on the annular groove (311). The position sensing device (5) is used to monitor the gripping position of the operator and adjust the attraction force of the electromagnet (13) according to the gripping position to adjust the locking force of the locking block (41) on the groove (21).

2. The angle grinder according to claim 1, characterized in that: The locking block (41) is provided with a ring buckle (411), and the first gear (31) is provided with a ring groove (311). The first gear (31) is rotated and positioned on the ring buckle (411) through the ring groove (311), and the ring groove (311) limits the ring buckle (411) to the front and back.

3. An angle grinder according to claim 1, characterized in that: The farther the operator holds the device from the speed reducer (2), the smaller the current is controlled to flow into the electromagnet (13).

4. An angle grinder according to claim 1, characterized in that: The position sensing device (5) is a switch. On the gripping part of the angle grinder, the switch is arranged evenly in sequence along the direction from the tail of the angle grinder to the grinding disc mounting position. When gripping, the gripping position is sensed by the switch and compared with the stored position point to identify the gripping position.

5. An angle grinder according to claim 1, characterized in that: A push-button switch (15) is also provided below the guide shaft (11). When the locking block (41) slides out of the annular groove (311), the locking block (41) presses against the push-button switch (15) to control the power off of the drive motor (3).

6. An angle grinder according to claim 5, characterized in that: When the push-button switch (15) is pressed, the control unit of the angle grinder controls the reversal of the current direction supplied to the electromagnet (13) to change the magnetic poles of the electromagnet (13) and give the magnetic attractor (412) a magnetic repulsive force toward the first elastic member (12).

7. A motor for an angle grinder as described in any one of claims 1-6, characterized in that: The drive motor (3) includes an energy-saving motor, which is a dual-shaft motor. The energy-saving motor body is covered with a dust cover, and fan blades are provided on both shafts. The fan blades on one side of the shaft are located outside the dust cover, while the fan blades on the other side of the shaft are located inside the dust cover.

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