Angle grinder and motor thereof

Abstract

The angle grinder comprises a shell, a speed reducing part, a driving motor and a transmission device, the speed reducing part is rotationally arranged in the shell, a grinding piece is assembled on the speed reducing part, the driving motor is arranged in the shell, the driving motor is in power connection with the speed reducing part through the transmission device, and the transmission device comprises a locking block. According to the angle grinder and the motor thereof provided by the invention, when a grinding sheet is clamped and the angle grinder counteracts to provide a relatively large torsion to an operator, the angle grinder automatically triggers torsion prevention, so that the speed reducing part shell is unlocked, and then the force transmitted to the speed reducing part by the driving motor drives the speed reducing part shell to rotate, so that the torsion is prevented from being transmitted to the operator, and the safety of the operator is ensured. And therefore, the anti-twisting effect is achieved, the use 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 invention relates to the technical field of angle grinders, in particular to an angle grinder and a motor thereof. Background Art

[0002] Angle grinder, also known as grinding machine or disc grinder, is mainly used for cutting and grinding. During the cutting or grinding process, the grinding disc may get stuck. At this time, the hand holding the grinder will move with the tail of the angle grinder, thereby spraining the operator. At the same time, during the twisting process, the grinder is always in the turned on state. Therefore, after the tail of the angle grinder touches an obstacle, the grinding disc may break free from the stuck position, causing the grinding disc to face the operator, resulting in a safety accident.

[0003] As disclosed in publication number CN213225581U, a protective cover of the grinder is provided to protect the personal safety of the operator. However, the problem of the operator being injured when the grinder is stuck cannot be solved. Summary of the Invention

[0004] The present invention aims to address the deficiencies in the prior art and provides an angle grinder and a motor thereof.

[0005] In order to solve the above technical problems, the present invention is solved through the following technical solutions: an angle grinder and its motor, including a shell, a reduction gear, a drive motor and a transmission device, the reduction gear is rotatably configured in the shell, the grinding plate is assembled on the reduction gear, the drive motor is configured in the shell, and the drive motor and the reduction gear are powered by a transmission device. The transmission device includes a locking block, and a groove adapted to the locking block is provided on the outer wall of the reduction gear. The locking block is elastically guided and slidably configured in the shell, and its front end elastically contacts the groove to elastically lock the reduction gear. When the torque applied to the reduction gear is greater than the locking force, the reduction gear rotates and the locking block elastically retreats.

[0006] Its beneficial effect is that when the grinding disc is stuck and the angle grinding device reacts to give the operator a large torque, the angle grinding device automatically triggers anti-twist, unlocks the reduction gear housing, and then the force transmitted to the reduction gear by the drive motor drives the reduction gear housing to rotate, thereby avoiding transmitting the torque to the operator and playing an anti-twist role.

[0007] In the above solution, preferably, the driving motor is provided with a first gear on the guide slide, the first gear slides back and forth, engages with or disengages from the matching gear on the transmission device, and the first gear moves back and forth along with the locking block.

[0008] The beneficial effect thereof is that the power connection between the drive motor and the reduction member is released at the first moment when the reduction member housing is unlocked.

[0009] In the above solution, preferably, a buckle is provided on the locking block, a ring groove is provided on the first gear, the first gear is rotatably arranged on the buckle through the ring groove, and the ring groove limits the front and rear positions of the buckle.

[0010] In the above solution, preferably, a guide shaft is configured in the shell, and the locking block is slidingly configured on the guide shaft. One end of the guide shaft is in contact with one end of the first elastic member on the fixed plate, and the other end is in contact with the locking block.

[0011] In the above scheme, preferably, a holding portion is configured on the shell, a holding position sensing device is configured on the holding portion, an electromagnet is configured on the other end of the guide shaft, and a magnetic suction part is configured on the locking block. After the electromagnet is energized, it is used to provide a magnetic suction force to the magnetic suction part, thereby increasing the locking force of the locking block on the ring groove. The position sensing device is used to monitor the holding position of the operator, and adjust the suction force of the electromagnet according to the holding position, so as to adjust the locking force of the locking block on the ring groove.

[0012] In the above solution, preferably, the farther the operator's grip is from the speed reducer, the smaller the current flowing into the electromagnet is controlled.

[0013] Its beneficial effect is that it can automatically adjust the pressing force of the locking block on the groove according to the operator's grip position, so that the farther the grip position is from the grinding plate, the smaller the torque of the anti-twist trigger is, thereby protecting the operator.

[0014] In the above scheme, preferably, the position sensing device is a switch component, and the switch components are evenly arranged in sequence on the gripping part of the angle grinding device along the direction from the tail of the angle grinding device to the grinding plate installation position. When holding, the holding position is sensed by the switch component and compared with the stored position point to identify the holding position.

[0015] In the above solution, preferably, a push switch is further provided below the guide shaft, and when the locking block slides out of the annular groove, the locking block presses on the push switch to control the driving motor to cut off power.

[0016] In the above solution, preferably, when the push switch is pressed, the control unit of the angle grinding device controls the reversal of the direction of the current flowing into the electromagnet to change the magnetic pole of the electromagnet and give the magnetic attraction member a magnetic repulsion force toward the first elastic member.

[0017] A motor for an angle grinder, wherein the drive motor includes an energy-saving motor, which is a dual-shaft motor. A dust cover is provided on the energy-saving motor body, and fan blades are provided on both shafts, and the fan blades on one shaft are located outside the dust cover, and the fan blades on the other shaft are located inside the dust cover.

[0018] Its beneficial effect is that the front and rear two-way ventilation allows air to flow through the entire energy-saving motor, thereby achieving the effect of rapid heat dissipation. At the same time, the two fans are located inside and outside the dust cover respectively, thereby reducing the obstruction of the dust cover to the air flow. At the same time, the dust cover is used to prevent dust from the energy-saving motor.

[0019] The beneficial effects of the present invention are as follows: the present invention provides an angle grinder and its motor, which can automatically trigger anti-twist when the grinding disc is stuck and the angle grinding device reacts to give the operator a large torque, unlocking the reduction gear housing, and then the force transmitted to the reduction gear by the driving motor drives the reduction gear housing to rotate, thereby avoiding transmitting the torque to the operator, and then playing an anti-twist role, ensuring the safety of the angle grinding device and improving the core competitiveness of the angle grinding device. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the present invention.

[0021] Figure 2 This is a cross-sectional view of the speed reducer of the present invention.

[0022] Figure 3 It is a transverse cross-sectional view of the present invention.

[0023] Figure 4 It is a partial enlarged view of the transmission device of the present invention.

[0024] Figure 5 Schematic diagram of the drive motor of the present invention.

[0025] Figure 6 This is a control diagram of Example 1 of the present invention.

[0026] Figure 7 This is a control diagram of Example 2 of the present invention. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Example 1:

[0028] See also Figures 1-6 An angle grinder and its motor include a housing 1, a reduction member 2, a drive motor 3, a transmission device 4 and a position sensing device 5. The reduction member 2, the drive motor 3 and the transmission device 4 are all arranged in the housing 1. The outer shell of the reduction member 2 is circular in design and is rotatably arranged in the housing 1. An input end and an output end are arranged on it. The input end is connected to the transmission device 4 for power, and the output end is used to install a grinding disc.

[0029] When the outer shell of the speed reducer 2 is fixed, the power input at the input end is output from the output end, thereby driving the grinding disc to rotate. When the outer shell of the speed reducer 2 is in the unlocked state, the power input at the input end directly drives the speed reducer 2 to rotate as a whole, and the speed reduction components inside the speed reducer 2 do not perform power transmission.

[0030] The housing 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 configured 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 touches the mounting plate at the rear end of the guide shaft 11, and the other end touches the locking block 41. A plurality of grooves 21 are evenly arranged on the circumference of the outer shell of the deceleration member 2. The front end of the locking block 41 is provided with a locking head 413, which is adapted to the groove 21. Under the action of the first elastic member 12, the locking head 413 elastically touches the groove 21, thereby elastically locking the outer shell of the deceleration member 2 so that it can transmit power. The locking head 413 is set to slide left and right, and an inclined chamfer is arranged around the contact surface between the locking head 41 and the groove 21, so that the locking head 413 can slide out of the groove 21.

[0031] The drive motor 3 includes an energy-saving motor, which is a dual-axis energy-saving motor. The energy-saving motor is fixedly arranged in the housing 1, and a dust cover 32 is provided on the energy-saving motor. The front and rear dual shafts of the energy-saving motor are both rotatably arranged on the dust cover 32. The rear end shaft of the energy-saving motor is provided with a first fan blade 33, which is located on the outside of the dust cover 32, and the front end shaft is provided with a second fan blade 34, which is located on the inside of 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 toward the dust cover 32, and the second fan blade 34 rotates to blow the air in the dust cover 32 out from the front end of the dust cover 32, thereby circulating the air in the dust cover 32, reducing the obstruction of the dust cover to the air flow, so that the drive motor 3 can quickly dissipate heat and prevent dust from the internal energy-saving motor, so that it can be used normally in harsh environments.

[0032] The first gear 31 is configured with a guide sliding on the front end shaft of the energy-saving motor and is located on the outside of the dust cover 32. A ring groove 311 is provided on the first gear 31, and a ring buckle 411 is provided on the locking block 41. The ring buckle 411 is configured on the ring groove 311 of the first gear 31, so that the locking block 41 drives the first gear 31 to move forward and backward when it moves forward and backward. At the same time, since the ring groove 311 and the ring buckle 411 are circular in design, the rotation of the first gear 31 does not affect the locking block 41.

[0033] When the locking head 413 of the locking block 41 touches 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, and the transmission gear set 42 is connected to the input end power of the speed reducer 2. Therefore, the drive motor 3 rotates, and the power transmission through the transmission gear set 42 drives the output end of the speed reducer 2 to rotate, that is, drives the grinding disc to rotate.

[0034] When the grinding disc encounters a jam during rotation, the operator holds the housing 1 of the grinding device, thereby exerting a restrictive force on the housing 1. When the jam occurs, the grinding disc stops rotating, and the speed reducer 2 as a whole generates a large torque. When the torque is greater than the friction force of the locking block 41 on the housing, the housing of the speed reducer 2 rotates under the action of the torque, and the groove 21 on the housing rotates out of the position of the locking block 41, and the locking block 41 moves backward. In the process of moving backward, it drives the first gear 31 to move backward together, thereby disengaging the first gear 31 from the gear on the transmission gear set 42, and then disconnecting the power transmission, so that the driving force that drives the grinding disc to rotate disappears, thereby achieving the function of preventing the operator from spraining.

[0035] The housing 1 is provided with a gripping portion 14, and the position sensing device 5 includes a control unit and an identification unit. The identification unit includes a switch component, which is a photoelectric sensor or a pressure sensor. A plurality of switch components are evenly arranged on the gripping portion 14 in sequence, and each switch component has an independent position code. When the operator holds the gripping portion 14, the photoelectric sensor at the gripping portion is blocked or the pressure sensor is pressed, and the sensor that recognizes the signal transmits the signal to the control unit. The control unit determines the position of the signal recognition area in the signal acquisition area by comparing it with the original stored signal position. An electromagnet 13 is provided on the other end of the guide shaft 11, that is, the end close to the speed reducer 2. A magnetic component 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 component 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.

[0036] The operator holds the angle grinder as a force point, the center of the grinding disc is the rotation point, and the grinding position on the edge of the grinding disc is the force point, forming a lever. When the grinding disc is stuck, the lever force is reversed, and the position where the operator holds the angle grinder is the force point. Therefore, under the action of the lever, when the grinding disc is stuck, the farther away from the center of the grinding disc, the greater the throwing force of the grinding device on the hand, and the easier it is to get injured. Therefore, it is necessary to adjust the disengagement torque according to the different holding positions of the operator to further protect the operator.

[0037] After the position sensing device 5 identifies the position of the operator's grip, the control unit compares the first signal source of the grip position with the originally stored signal position, and determines the grip position. The current corresponding to each signal position is stored in the control unit, and then the current of the electromagnet 13 is automatically matched according to the position of the operator's grip. The farther away from the speed reducer 2, the greater the corresponding current, and the further away the grip position is from the speed reducer 2, the smaller the friction of the locking block 41 on the groove 21, and the further the operator's grip position is from the speed reducer 2, the smaller the disengagement torque, thereby further protecting the operator.

[0038] Its working principle or usage is as follows: In the initial state, the locking head 413 contacts 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 connected to the input end power of the speed reducer 2. Therefore, the drive motor 3 rotates, and the power transmission through the transmission gear set 42 drives the output end of the speed reducer 2 to rotate, that is, drives the grinding disc to rotate.

[0039] At this time, the equipment is started, that is, the drive motor 3 and the electromagnet 13 are energized, and the operator holds the shell 1 to grind or cut the workpiece. The sensing device 5 identifies the position of the operator's holding, and the control unit automatically matches the current of the electromagnet 13 according to the position of the operator's holding. The farther away from the speed reducer 2, the greater the corresponding current, and the farther the holding position is from the speed reducer 2, the smaller the friction force of the locking block 41 on the groove 21.

[0040] When jamming occurs, the grinding disc stops rotating. At this time, the reducer 2 as a whole generates a large torque. When the torque is greater than the friction force of the locking block 41 on the outer shell, the outer shell of the reducer 2 rotates under the action of the torque. 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 reducer 2 rotates, and the torque generated by the jam disappears as the outer shell of the reducer 2 rotates, thereby protecting the operator and achieving the anti-twist function.

[0041] At the same time, the device automatically adjusts the disengagement torque according to the operator's grip position. The further the operator's grip position is away from the speed reducer 2, the smaller the disengagement torque is, thereby further protecting the operator.

[0042] Example 2:

[0043] Compared with embodiment 1, the difference lies in the electromagnet 13 and the control unit, and the rest are the same. Figure 1-Figure 5 and Figure 7The electromagnet 13 can generate different magnetic poles after positive and negative currents are passed through it, and the control unit can control the direction of the current input into the electromagnet 13. A press switch component 15 is also provided at a position below the guide shaft 11. When the locking block 41 slides out of the annular groove 311, the locking block 41 presses on the press switch component 15 to control the power off of the drive motor 3, ensuring that the drive motor 3 no longer provides power to the deceleration component 2, further improving the safety of the device. At the same time, after the press switch 13 is pressed, the control unit controls the input of reverse current to the electromagnet 13, thereby causing the electromagnet 13 to generate reverse magnetic poles, thereby converting the magnetic attraction force of the magnetic attraction component 412 into a magnetic repulsion force, and the current is at its maximum value, so that the magnetic repulsion force is sufficient to deform the first elastic component 12 and push the locking block 41 out of the groove 21.

[0044] After the locking block 41 is engaged, the drive motor 3 is powered off immediately. At the same time, the locking block 41 is separated from the groove 21 by the magnetic force, and the housing of the speed reducer 2 is automatically unlocked, ensuring that after the first separation, it is in a separated state subsequently.

[0045] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An angle grinder, characterized in that: The invention comprises a housing (1), a speed reducer (2), a driving motor (3) and a transmission device (4), wherein the speed reducer (2) is rotatably arranged in the housing (1), the grinding sheet is assembled on the speed reducer (2), the driving motor (3) is arranged in the housing (1), and a power connection is achieved between the driving motor (3) and the speed reducer (2) via 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 deceleration member (2). The locking block (41) is elastically guided and slidably arranged in the housing (1). The front end of the locking block elastically contacts the groove (21) to elastically lock the deceleration member (2). When the torque applied to the deceleration member (2) is greater than the locking force, the deceleration member (2) rotates and the locking block (41) elastically retreats.

2. An angle grinder and a motor thereof according to claim 1, characterized in that: The driving motor (3) is provided with a first gear (31) on the guide slide. The first gear (31) slides forward and backward to engage or disengage with the matching gear on the transmission device (4). The first gear (31) moves forward and backward along with the locking block (41).

3. An angle grinder according to claim 2, 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 rotatably arranged on the ring buckle (411) through the ring groove (311), and the ring groove (311) limits the ring buckle (411) in front and back directions.

4. The angle grinder according to claim 1, characterized in that: A guide shaft (11) is disposed in the housing (1), and a locking block (41) is configured to slide on the guide shaft (11). One end of the guide shaft contacts one end of a first elastic member (12) on a fixed plate, and the other end contacts the locking block (41).

5. An angle grinder according to claim 4, characterized in that: The housing (1) is provided with a gripping portion, and a gripping position sensing device (5) is provided on the gripping portion. The other end of the guide shaft (11) is provided with an electromagnet (13), and the locking block (41) is provided with a magnetic attraction member (412). When the electromagnet (13) is energized, it provides a magnetic attraction force to the magnetic attraction member (412), thereby increasing 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 (412) according to the gripping position, thereby adjusting the locking force of the locking block (41) on the groove (21).

6. An angle grinder according to claim 5, characterized in that: The farther the operator's gripping position is from the speed reducer (2), the smaller the current flowing into the electromagnet (412) is controlled.

7. The angle grinder according to claim 5, characterized in that: The position sensing device (5) is a switch component. On the gripping portion of the angle grinding device, the switch components are evenly arranged in sequence along the direction from the tail of the angle grinding device to the grinding sheet installation position. When gripping, the gripping position is sensed by the switch component and compared with the stored position point to identify the gripping position.

8. The angle grinder according to claim 5, characterized in that: A pressing switch member (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 pressing switch member (15) to control the driving motor (3) to cut off power.

9. The angle grinder according to claim 8, characterized in that: When the push switch member (15) is pressed, the control unit of the angle grinding device controls the reversal of the direction of the current flowing into the electromagnet (13), so as to change the magnetic pole of the electromagnet (13) and give the magnetic attraction member (412) a magnetic repulsive force toward the first elastic member (12).

10. A motor for an angle grinder according to any one of claims 1 to 9, characterized in that: The drive motor (3) comprises an energy-saving motor, which is a double-shaft motor. A dust cover is provided on the upper cover of the energy-saving motor body. Fan blades are provided on both shafts, and the fan blades on one shaft are located outside the dust cover, while the fan blades on the other shaft are located inside the dust cover.

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