Angle grinder with anti-separation flange plate structure

Abstract

The invention relates to the technical field of anti-separation flange plates, in particular to an angle grinder with an anti-separation flange plate structure, which comprises a gear box and two third fastening rings, a main body mechanism is arranged on the side surface of the gear box, a handle is arranged on the end surface of the main body mechanism, and a gear switch is arranged on the side surface of the handle; the lower end of the gearbox is provided with an anti-disengaging connecting mechanism and a first cavity, the lower end of the gearbox is fixedly connected with a fixing plate through screws, the inner side of the fixing plate is rotationally connected with a first bevel gear arranged in the first cavity, the lower end of the first bevel gear is connected with a gear shaft in a clamped mode, and the lower end of the fixing plate is connected with a supporting ring. The gear shaft, the second fixing ring and the third fixing ring are integrated, the torque borne by the third fixing ring is transmitted to the first fixing ring through the limiting column, and therefore it is guaranteed that the rotating torque cannot act on a bolt for fixing the second fixing ring and the third fixing ring, and the bolt is prevented from being damaged or loosened.

Description

Technical Field

[0001] The present invention relates to the technical field of anti-disengagement flange plates, and particularly to a angle grinder with an anti-disengagement flange plate structure. Background Art

[0002] An angle grinder is a common power tool and is widely used in multiple fields such as metal processing, stone processing, and building decoration. The motor of the angle grinder drives the working head to rotate at a high speed through a transmission device. Working accessories such as grinding wheels, cutting discs, or polishing wheels installed on the working head come into contact with the surface of the workpiece, and through friction and grinding effects, operations such as cutting, grinding, and polishing are performed on the workpiece. In the prior art, when fixing components such as grinding wheels on an angle grinder, a double-flange plate extrusion fixation method is generally used, that is, the grinding wheel is clamped between two flange plates, and the two flange plates are fastened by means of threads or the like. This structure can provide more stable support and a more uniform pressure distribution.

[0003] In the existing technology, the two flange plates are locked on the gear shaft through threads to clamp the grinding wheel, and the flange plates are connected to the gear shaft through threads. When the angle grinder is working, the grinding wheel will come into contact with an object during high-speed rotation. At this time, the grinding wheel will apply this relatively large resistance to the two flange plates. The two flange plates are directly fixed to the gear shaft through threads. After long-term use, the threads between the flange plates and the gear shaft are prone to damage, and the safety is relatively low. For an angle grinder with an emergency stop function, when suddenly powered off or stopped working, due to the huge inertia of the grinding wheel disc, the flange plate fixing the grinding wheel will naturally become loose. The grinding wheel is clamped and fixed through the sides of the two flange plates. When the grinding wheel is used for a long time, cracks may appear on its surface, resulting in a gap between the grinding wheel and the flange plate, causing the grinding wheel to become loose. The existing device cannot detect the gap in time, and the reliability is relatively low. Summary of the Invention

[0004] The purpose of the present invention is to solve the disadvantages existing in the background art, and to propose an angle grinder with an anti-disengagement flange plate structure.

[0005] To achieve the above object, the technical solution adopted by the present invention is: an angle grinder with an anti-disengagement flange plate structure, including a gear box and two third fastening rings. A main body mechanism is arranged on the side of the gear box, a handle is arranged on the end face of the main body mechanism, a gear shift switch is arranged on the side of the handle, an anti-disengagement connection mechanism is arranged at the lower end of the gear box, a first cavity is opened at the lower end of the gear box, a fixing plate is fixedly connected to the lower end of the gear box by screws, a first bevel gear arranged in the first cavity is rotatably connected to the inside of the fixing plate, a gear shaft is snap-connected to the lower end of the first bevel gear, a support ring is connected to the lower end of the fixing plate, a connecting ring is fixedly connected to the side of the support ring, and a grinding wheel cover is fixedly connected to the side of the connecting ring.

[0006] Preferably, a first fixing ring with a cylindrical structure is fixedly connected to the lower end of the gear shaft. A first limiting groove is formed at the lower end of the gear shaft and the end of the first fixing ring. A threaded groove communicating with the first limiting groove is formed on the inner side surface of the first fixing ring.

[0007] Preferably, a second fixing ring is slidably arranged on the side surface of the first fixing ring. A first fastening ring is fixedly connected to the side surface of the second fixing ring. Two symmetrically arranged limiting columns are slidably arranged in the first limiting groove of the first fixing ring. A third fixing ring slidably matched with the inner side surface of the second fixing ring is fixedly connected to the lower ends of the two limiting columns. A second fastening ring is fixedly connected to the side surface of the third fixing ring.

[0008] Preferably, a screw rod is arranged inside the second fixing ring and the third fixing ring. The upper end of the screw rod is in threaded cooperation with the threaded groove. A first empty groove is formed at the upper end of the second fixing ring and is slidably matched with the side surface of the gear shaft.

[0009] Preferably, the main body mechanism includes a main body shell. A vertical shell is fixedly connected to the side surface of the gear box. The side surface of the main body shell is fixedly connected to the vertical shell. A second cavity is formed inside the vertical shell. A motor is fixedly connected inside the main body shell. A transmission shaft is fixedly connected to the output shaft end of the motor. A second bevel gear is fixedly connected to the end of the transmission shaft inside the second cavity. The side surface of the second bevel gear is meshed with the first bevel gear.

[0010] Preferably, a plurality of exhaust holes communicating with the inside of the main body shell are formed on the side surface of the vertical shell. An axial flow fan is fixedly connected to the side surface of the transmission shaft. A plurality of air inlet holes are formed on the side surface of the main body shell.

[0011] Preferably, the two third fastening rings are in a ring structure. The inner side surfaces of the two third fastening rings are respectively fixedly connected to the outer side surfaces of the second fixing ring and the third fixing ring.

[0012] Preferably, a plurality of second through holes evenly distributed at equal angles are respectively formed on the side surfaces of the two third fastening rings. Limiting rods are respectively fixedly connected to the two third fastening rings in the second through holes. Cut-off plates are respectively fixedly connected to the ends of the plurality of limiting rods. Pistons are respectively slidably arranged on the side surfaces of the plurality of limiting rods. The side surfaces of the plurality of pistons are in contact with the third fastening rings through sealing rings. A plurality of first through holes are respectively formed on the opposite end faces of the two third fastening rings and are respectively communicated with the second through holes. Pressure sensors are arranged on the inner side surfaces of the plurality of pistons.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] 1. The first fastening ring on the side of the second fixing ring and the second fastening ring on the side of the third fixing ring tightly hold the grinding wheel in place. When the rotating grinding wheel contacts an object or the angle grinder activates its emergency stop function, the grinding wheel will exert a large torque on the second and third fixing rings. At this time, the limiting post at the upper end of the third fixing ring is within the first limiting groove, making the gear shaft, the second fixing ring, and the third fixing ring an integral whole. The torque received by the third fixing ring is transmitted to the first fixing ring through the limiting post, thus ensuring that the rotational torque does not act on the bolts fixing the second and third fixing rings, preventing the bolts from being damaged or loosened and improving the reliability of the device.

[0015] 2. Under the action of centrifugal force, the piston moves towards the outside of the second through-hole. When the piston moves, the pressure in the area where the second through-hole communicates with the first through-hole decreases, providing an additional adsorption force to the rotating grinding wheel, further preventing the grinding wheel from shifting and improving the safety of the device. The pressure sensor and the gear switch on the inner side of the piston are electrically connected to the controller. When cracks appear on the side of the grinding wheel due to impacts or rust, etc., during the process of the device driving the grinding wheel to rotate, the value of the pressure sensor inside the piston will be lower than the safety value. At this time, the pressure sensor will transmit the signal to the gear switch through the controller, and the gear switch will turn off the device after receiving the signal, ensuring that the flatness of the surface of the grinding wheel can be detected at all times during the use of the device and preventing gaps from appearing between the surface of the grinding wheel and the flange. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0017] Figure 2 is a cross-sectional view of the overall structure of the present invention;

[0018] Figure 3 is a partial exploded view of the present invention Figure 1 ;

[0019] Figure 4 is a partial exploded view of the present invention Figure 2 ;

[0020] Figure 5 is of the present invention Figure 2 magnified view at A;

[0021] Figure 6 is of the present invention Figure 3 magnified view at B;

[0022] Figure 7 is of the present invention Figure 3 magnified view at C;

[0023] Figure 8 is a schematic diagram of the structure of Embodiment 2 of the present invention.

[0024] 1. Gearbox; 2. Anti-disengagement connection mechanism; 3. Main body mechanism; 4. Gear position switch; 5. Handle; 11. Vertical housing; 12. First cavity; 13. Second cavity; 14. First bevel gear; 15. Fixed plate; 22. Grinding wheel cover; 23. Connecting ring; 24. Gear shaft; 25. First fixing ring; 26. First limiting groove; 27. Threaded groove; 28. Second fixing ring; 29. First empty groove; 210. First fastening ring; 211. Limiting post; 212. Third fixing ring; 213. Second fastening ring; 214. Screw; 216. Third fastening ring; 217. First through hole; 218. Second through hole; 219. Limiting rod; 220. Piston; 31. Main body housing; 32. Motor; 33. Transmission shaft; 34. Turbofan; 35. Second bevel gear; 36. Exhaust hole; 37. Intake hole; 39. Stator housing; 40. Labyrinth passage. Detailed implementation manners

[0025] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments in the following description are only examples, and those skilled in the art can think of other obvious variations.

[0026] Embodiment 1: Please refer to Figure 1 - Figure 7 , an angle grinder with an anti-disengagement flange structure, including a gearbox 1 and two third fastening rings 216. A main body mechanism 3 is arranged on the side of the gearbox 1, a handle 5 is arranged on the end face of the main body mechanism 3, a gear position switch 4 is arranged on the side of the handle 5, and an anti-disengagement connection mechanism 2 is arranged at the lower end of the gearbox 1.

[0027] In this embodiment, a first cavity 12 is opened at the lower end of the gearbox 1. The lower end of the gearbox 1 is fixedly connected with a fixed plate 15 by screws. The inner side of the fixed plate 15 is rotatably connected with a first bevel gear 14 arranged in the first cavity 12. The lower end of the first bevel gear 14 is snap-connected with a gear shaft 24. The lower end of the fixed plate 15 is connected with a support ring. The side of the support ring is fixedly connected with a connecting ring 23. The side of the connecting ring 23 is fixedly connected with a grinding wheel cover 22.

[0028] The lower end of the gear shaft 24 is fixedly connected with a first fixing ring 25 in a cylindrical structure. The lower end of the gear shaft 24 and the end of the first fixing ring 25 are provided with a first limiting groove 26. The inner side of the first fixing ring 25 is provided with a threaded groove 27 communicating with the first limiting groove 26.

[0029] A second fixing ring 28 is slidably arranged on the side surface of the first fixing ring 25. A first fastening ring 210 is fixedly connected to the side surface of the second fixing ring 28. Two symmetrically arranged limiting posts 211 are slidably arranged in a first limiting groove 26 of the first fixing ring 25. The lower ends of the two limiting posts 211 are fixedly connected to a third fixing ring 212 that is slidably matched with the inner side surface of the second fixing ring 28. A second fastening ring 213 is fixedly connected to the side surface of the third fixing ring 212.

[0030] A screw rod 214 is arranged inside the second fixing ring 28 and the third fixing ring 212. The upper end of the screw rod 214 is arranged in threaded cooperation with a threaded groove 27. A first empty groove 29 is formed in the upper end of the second fixing ring 28. The first empty groove 29 is slidably matched with the side surface of the gear shaft 24.

[0031] The main body mechanism 3 includes a main body shell 31. A vertical shell 11 is fixedly connected to the side surface of the gear box 1. The side surface of the main body shell 31 is fixedly connected to the vertical shell 11. A second cavity 13 is formed inside the vertical shell 11. A motor 32 is fixedly connected inside the main body shell 31. A transmission shaft 33 is fixedly connected to the output shaft end of the motor 32. A second bevel gear 35 is fixedly connected to the end of the transmission shaft 33 inside the second cavity 13. The side surface of the second bevel gear 35 is meshed with a first bevel gear 14.

[0032] A plurality of exhaust holes 36 communicating with the inside of the main body shell 31 are formed in the side surface of the vertical shell 11. A scroll fan 34 is fixedly connected to the side surface of the transmission shaft 33. A plurality of air inlet holes 37 are formed in the side surface of the main body shell 31.

[0033] Specifically, the gear shaft 24, the second fixing ring 28 and the third fixing ring 212 are an integral whole. The torque received by the third fixing ring 212 is transmitted to the first fixing ring 25 through the limiting posts 211, so as to ensure that the rotation torque will not act on the bolts fixing the second fixing ring 28 and the third fixing ring 212, prevent the bolts from being damaged or loosened, and improve the reliability of the device.

[0034] Embodiment 2: Please refer to Figure 8 , in this embodiment, the two third fastening rings 216 are of a circular ring structure. The inner side surfaces of the two third fastening rings 216 are respectively fixedly connected to the outer side surfaces of the second fixing ring 28 and the third fixing ring 212.

[0035] On the sides of the two third fastening rings 216, a number of second through holes 218 are respectively provided at equal angles. In the second through holes 218 of the two third fastening rings 216, limiting rods 219 are respectively fixedly connected. At the end parts of the number of limiting rods 219, cutoff plates are respectively fixedly connected. On the sides of the number of limiting rods 219, pistons 220 are respectively slidably arranged. On the sides of the number of pistons 220, they are in contact with the third fastening rings 216 through sealing rings. On the opposite end faces of the two third fastening rings 216, a number of first through holes 217 are respectively provided. The number of first through holes 217 are respectively communicated with the second through holes 218. On the inner sides of the number of pistons 220, pressure sensors are arranged.

[0036] Specifically, when the piston 220 moves, it will cause the pressure in the area where the second through hole 218 communicates with the first through hole 217 to decrease. And the side of the third fastening ring 216 is in close contact with the side of the grinding wheel, so that the first through holes 217 on the side of the third fastening ring 216 suck the grinding wheel, providing an additional adsorption force for the rotating grinding wheel, further preventing the grinding wheel from shifting and improving the safety of the device.

[0037] Before use, when fixing the grinding wheel, first slide the inner side of the second fixing ring 28 on the outer side of the first fixing ring 25. At the same time, the first empty groove 29 at the upper end of the second fixing ring 28 moves to the side of the gear shaft 24. Then, press the side of the grinding wheel tightly against the lower end face of the first fastening ring 210. Then, push the third fixing ring 212 into the inner side of the second fixing ring 28. At the same time, ensure that the limiting column 211 at the upper end of the third fixing ring 212 is matched with the first limiting groove 26 at the lower end of the gear shaft 24. Then, tighten and fix with bolts, so that the first fastening ring 210 on the side of the second fixing ring 28 and the second fastening ring 213 on the side of the third fixing ring 212 tightly hold the grinding wheel. When the rotating grinding wheel contacts an object or the angle grinder starts the emergency stop function, at this time, the grinding wheel will apply a large torque to the second fixing ring 28 and the third fixing ring 212. At this time, the limiting column 211 at the upper end of the third fixing ring 212 is in the first limiting groove 26, so that the gear shaft 24, the second fixing ring 28 and the third fixing ring 212 are an integral body. The torque received by the third fixing ring 212 is transmitted to the first fixing ring 25 through the limiting column 211, thus ensuring that the rotating torque will not act on the bolts fixing the second fixing ring 28 and the third fixing ring 212, preventing the bolts from being damaged or loosened and improving the reliability of the device.

[0038] Furthermore, a labyrinth passage 40 is provided on the housing of the angle grinder. The air inlet hole, the labyrinth passage 40, the inside of the main housing 31, and the exhaust hole are communicated in sequence. The shape of the labyrinth passage 40 is circuitously bent, which is used to increase the resistance of the air flow, thereby reducing the risk of external dust entering the inside of the angle grinder through the labyrinth passage 40.

[0039] In addition, the stator housing 38 is located in the main housing 31. The stator housing 38 constructs a cavity which encloses and seals the stator and rotor of the motor 32; the stator housing 39 seals the stator and rotor of the motor, achieving the protection of the stator and rotor.

[0040] When the device is in use, the motor 32 drives the transmission shaft 33 to rotate. The transmission shaft 33 transmits power through the meshing rotation of the second bevel gear 35 and the first bevel gear 14. At the same time, the side of the transmission shaft 33 drives the turbofan 34 to rotate. When the turbofan 34 rotates, it drives air to enter the main housing 31 through the air inlet hole 37, and then the gas is discharged through the air outlet hole 36, which can take away the heat generated when the motor 32 rotates, improving the practicability of the device.

[0041] Replace the first fastening ring 210 and the second fastening ring 213 on the sides of the second fixing ring 28 and the third fixing ring 212 with the third fastening ring 216. When in use, the motor 32 drives the two third fastening rings 216 to rotate. The two third fastening rings 216 drive the grinding wheel to rotate. While rotating, the piston 220 in the third fastening ring 216 moves outward to the outside of the second through hole 218 under the action of centrifugal force. When the piston 220 moves, the pressure in the area where the second through hole 218 communicates with the first through hole 217 decreases. Moreover, the side of the third fastening ring 216 is in close contact with the side of the grinding wheel, so that the first through hole 217 on the side of the third fastening ring 216 sucks the grinding wheel, providing an additional adsorption force for the rotating grinding wheel, further preventing the grinding wheel from shifting and improving the safety of the device. The pressure sensor and the gear shift switch 4 on the inner side of the piston 220 are electrically connected to the controller. When cracks appear on the side of the grinding wheel due to impacts or rusting, etc., during the process of the device driving the grinding wheel to rotate, the value of the pressure sensor inside the piston 220 will be lower than the safety value. At this time, the pressure sensor will transmit the signal to the gear shift switch 4 through the controller. After receiving the signal, the gear shift switch 4 shuts down the device, ensuring that the flatness of the surface of the grinding wheel can be detected at all times during the use of the device, preventing gaps from appearing between the surface of the grinding wheel and the flange.

[0042] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. What is described in the above embodiments and the specification is only the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. An angle grinder with an anti-disengagement flange structure, comprising a gearbox (1) and two third fastening rings (216), characterized in that: A main body mechanism (3) is provided on the side of the gearbox (1). A handle (5) is provided on the end face of the main body mechanism (3). A gear shift switch (4) is provided on the side of the handle (5). An anti-disengagement connection mechanism (2) is provided at the lower end of the gearbox (1). A first cavity (12) is opened at the lower end of the gearbox (1). A fixing plate (15) is fixedly connected to the lower end of the gearbox (1) by screws. A first bevel gear (14) disposed in the first cavity (12) is rotatably connected to the inner side of the fixing plate (15). A gear shaft (24) is snap-fitted to the lower end of the first bevel gear (14). A support ring is connected to the lower end of the fixing plate (15). A connecting ring (23) is fixedly connected to the side of the support ring. A grinding wheel cover (22) is fixedly connected to the side of the connecting ring (23).

2. The angle grinder with an anti-disengagement flange structure according to claim 1, characterized in that: A first fixing ring (25) in the shape of a cylinder is fixedly connected to the lower end of the gear shaft (24). A first limiting groove (26) is opened at the lower end of the gear shaft (24) and the end of the first fixing ring (25). A thread groove (27) communicating with the first limiting groove (26) is opened on the inner side face of the first fixing ring (25).

3. The angle grinder with an anti-separation flange structure according to claim 2, characterized in that: A second fixing ring (28) is slidably disposed on the side face of the first fixing ring (25). A first fastening ring (210) is fixedly connected to the side face of the second fixing ring (28). Two symmetrically disposed limiting posts (211) are slidably disposed in the first limiting groove (26) of the first fixing ring (25). A third fixing ring (212) slidably mating with the inner side face of the second fixing ring (28) is fixedly connected to the lower ends of the two limiting posts (211). A second fastening ring (213) is fixedly connected to the side face of the third fixing ring (212).

4. A angle grinder with a flange structure for preventing disengagement according to claim 3, characterized in that: A screw rod (214) is disposed inside the second fixing ring (28) and the third fixing ring (212). The upper end of the screw rod (214) is threadedly engaged with the thread groove (27). A first empty groove (29) is opened at the upper end of the second fixing ring (28). The first empty groove (29) is slidably mated with the side face of the gear shaft (24).

5. A angle grinder with a flange structure for preventing detachment according to claim 1, characterized in that: The main body mechanism (3) includes a main body shell (31). A vertical shell (11) is fixedly connected to the side of the gearbox (1). The side face of the main body shell (31) is fixedly connected to the vertical shell (11). A second cavity (13) is opened inside the vertical shell (11). A motor (32) is fixedly connected inside the main body shell (31). A transmission shaft (33) is fixedly connected to the output shaft end of the motor (32). A second bevel gear (35) is fixedly connected to the end of the transmission shaft (33) inside the second cavity (13). The side face of the second bevel gear (35) is meshed with the first bevel gear (14).

6. The angle grinder with an anti-disengagement flange structure according to claim 5, wherein: A plurality of exhaust holes (36) communicating with the inside of the main body shell (31) are opened on the side face of the vertical shell (11). A scroll fan (34) is fixedly connected to the side face of the transmission shaft (33). A plurality of air inlet holes (37) are opened on the side face of the main body shell (31).

7. The angle grinder with a flange structure for preventing detachment according to claim 1, wherein: The two third fastening rings (216) are in a circular ring structure, and the inner sides of the two third fastening rings (216) are respectively fixedly connected to the outer sides of the second fixing ring (28) and the third fixing ring (212).

8. A angle grinder with a flange structure for preventing detachment according to claim 7, characterized in that: A number of second through holes (218) evenly distributed at equal angles are respectively formed in the sides of the two third fastening rings (216). A limiting rod (219) is fixedly connected in each of the second through holes (218) of the two third fastening rings (216). A cutoff plate is fixedly connected to the end of each of the number of limiting rods (219). A piston (220) is slidably arranged on the side of each of the number of limiting rods (219). The sides of the number of pistons (220) are in contact with the third fastening ring (216) through a sealing ring. A number of first through holes (217) are respectively formed in the opposite end faces of the two third fastening rings (216). The number of first through holes (217) are respectively communicated with the second through holes (218). A pressure sensor is arranged on the inner side of each of the number of pistons (220).

9. The angle grinder with an anti-disengagement flange structure according to claim 8, wherein A labyrinth passage is formed in the housing of the angle grinder. The air inlet hole, the labyrinth passage, the interior of the main housing, and the exhaust hole are communicated in sequence. The shape of the labyrinth passage is tortuous and bent, which is used to increase the resistance of the air flow, thereby reducing the risk of external dust entering the interior of the angle grinder through the labyrinth passage.

10. The angle grinder with an anti-disengagement flange structure according to claim 8, wherein The stator housing is located in the main housing. The stator housing constructs a cavity, and the cavity encloses and seals the stator and rotor of the motor.

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