Electric grinding head and direct-drive angle grinder

Abstract

The utility model relates to the field of grinding devices, and discloses an electric grinding head and a direct drive type angle grinder. The grinding head comprises a grinding head shell, a main shaft and a grinding wheel ring, a stator and a rotor are arranged in the grinding head shell, the main shaft is inserted in the rotor and synchronously rotates with the rotor, one end of the main shaft protrudes out of the grinding head shell and is connected with the grinding wheel ring, and the grinding wheel ring and the main shaft synchronously rotate; a plurality of water containing grooves are formed in the outer wall of the grinding head shell in the circumferential direction at intervals, every two adjacent water containing grooves communicate with each other, sealing cover plates are detachably installed at notches of the multiple water containing grooves, a water inlet connector and a water outlet connector are arranged on the outer wall of the grinding head shell, and cooling water is introduced into the water inlet connector through a water pipe. The water outlet connector is suitable for discharging cooling water sequentially passing through the multiple water containing grooves. The cooling effect of the electric grinding head is improved through water cooling; the cooling range is enlarged; and the sealing performance of the water cooling part is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to polishing device technical field, more particularly, relates to a kind of electric motor head and direct drive type angle grinder. BACKGROUND

[0002] Electric motor head is mainly installed on direct drive type angle grinder for workpiece polishing.Electric motor head includes grinding wheel, rotating shaft and external motor, rotating shaft is connected with the motor shaft of external motor by coupling, grinding wheel is connected with rotating shaft and synchronous rotation, to drive grinding wheel rotation by external motor.Present external motor to not influence the operation of stator and rotor, usually adopt physical heat dissipation, namely, external wall of external motor is equipped with multiple heat dissipation fins, and heat dissipation fin on the heat carried away by external air flow realizes heat dissipation.But, air temperature is higher in summer, and air current is hot air current, when electric motor head works for a long time, the temperature of external motor will be higher, and external air current is hot air current, leading to poor heat dissipation effect of external motor, thus it needs to close electric motor head for a period of time to cool down external motor. SUMMARY

[0003] To solve at least one aspect of the above problems, the utility model first provides a kind of electric motor head, including motor head shell, main shaft and grinding wheel ring, the inside of motor head shell is equipped with stator and rotor, the main shaft is inserted in the inside of motor head shell and is inserted in the rotor, the main shaft is synchronous with the rotor rotation, the main shaft one end projects from the motor head shell and is connected with the grinding wheel ring, the grinding wheel ring is synchronous with the main shaft rotation;The outer wall of motor head shell is circumferentially spaced apart and is equipped with multiple water holding grooves, two adjacent water holding grooves are communicated, and the slot of multiple water holding grooves is detachably installed with sealing cover plate, the sealing cover plate is suitable for covering and sealing the slot of corresponding water holding groove, the outer wall of motor head shell is equipped with water inlet connector and water outlet connector, the water inlet connector and the water outlet connector are respectively communicated with two water holding grooves at both ends in the arrangement direction of multiple water holding grooves, the water inlet connector is suitable for being connected with water pipe and being connected with cooling water, and the water outlet connector is suitable for being connected with cooling water and being discharged.

[0004] Optionally, the side of the grinding wheel ring close to the motor head shell is equipped with a water baffle, and the outer diameter of the water baffle is greater than the outer diameter of the grinding wheel ring.

[0005] Optionally, the stator and the rotor are located within the length range of the water holding groove, and multiple water holding grooves are arranged at intervals in the circumferential direction of the rotor.

[0006] Optionally, multiple partition plates are arranged at intervals in the water holding groove, the water holding groove is divided into multiple sub-flow grooves by the multiple partition plates, two adjacent sub-flow grooves are communicated, and the cooling water flows in an S shape in the multiple sub-flow grooves.

[0007] Optionally, the partition plate is provided with a notch near a side corresponding to the sealing cover plate, and two adjacent shunt grooves are communicated through the notch.

[0008] Optionally, the sealing ring is provided at the groove of the water tank, and opposite sides of the sealing ring are abutted against the grinding head shell and the sealing cover plate.

[0009] Optionally, the sealing ring is provided at the groove of the water tank, and opposite sides of the sealing ring are abutted against the grinding head shell and the sealing cover plate.

[0010] Optionally, the inner wall and the outer wall of the sealing ring are provided with convex rings, the first sealing groove is provided with a clamping groove on each of two opposite groove walls, and the convex rings are clamped in the corresponding clamping grooves in an interference fit.

[0011] Optionally, the inner wall of the sealing ring is provided with a plurality of ring grooves, and the ring grooves are arranged in a spaced manner along the direction of the grinding head shell close to the sealing cover plate.

[0012] Compared with the prior art, the beneficial technical effects of the utility model are that:

[0013] 1. The stator and the rotor of the motor are installed in the grinding head shell and connected with the main shaft and the rotor, compared with the external motor, the above structure integrates the main components of the motor in the grinding head shell to directly drive the grinding wheel ring to rotate, reduces the connecting piece, and at the same time, cooling water is introduced into the plurality of water tanks, and the heat dissipation fins are replaced by water cooling, the cooling and cooling are not affected by the external airflow temperature, the cooling effect is improved, and the working time of the electric grinding head is improved.

[0014] 2. The water tank can be directly formed on the outer wall of the grinding head shell, the machining difficulty is low, the machining is convenient, the length of the water tank is greater than that of the stator and the rotor, the cooling range is wide, and in addition, the partition plate can make the cooling water flow in an S shape, increase the flow time of the cooling water, and further improve the cooling effect.

[0015] 3. The sealing ring is clamped in the first sealing groove through the convex ring, and is not easy to fall off when the sealing cover plate is disassembled, in addition, the convex ring will also be deformed in the clamping groove to form a second sealing after the sealing ring is extruded by the sealing cover plate, and the plurality of ring grooves on the inner wall of the sealing ring make the sealing ring form a multiple sealing effect after being extruded, thereby improving the sealing performance and preventing the water in the water tank from leaking out.

[0016] 4. Since cooling liquid needs to be poured on the workpiece during grinding, the splash plate can block the splashing cooling liquid, so that the splashing cooling liquid is not easy to enter the grinding head shell to affect the stator and the rotor.

[0017] In addition, the utility model provides a direct drive type angle grinder, including the electric grinding head as above.

[0018] Relative to prior art, the direct drive type angle grinder and the electric grinding head have the same advantages relative to prior art, and the advantages will not be repeated here. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 It is the explosion map of the grinding head shell and the sealing cover plate in the embodiment of the utility model;

[0020] Figure 2 It is the sectional view of the electric grinding head in the embodiment of the utility model;

[0021] Figure 3 It is the structure diagram of the grinding head shell in the embodiment of the utility model;

[0022] Figure 4 It is the explosion map of the grinding head shell, the sealing ring and the sealing cover plate in the embodiment of the utility model;

[0023] Figure 5 It is the local enlarged view of the grinding head shell, the sealing ring and the sealing cover plate in the embodiment of the utility model.

[0024] The reference signs are explained as follows: 1, grinding head shell; 11, water tank; 111, partition; 1111, notch; 112, sealing cover plate; 12, mounting groove; 13, tail cover; 14, front end cover; 15, flange plate; 16, water baffle; 17, water inlet connector; 18, water outlet connector; 19, sealing ring; 191, convex ring; 192, ring groove; 2, main shaft; 3, grinding wheel ring. DETAILED DESCRIPTION

[0025] In order to make the above purpose, features and advantages of the utility model more obvious and easy to understand, the specific embodiments of the utility model are described in detail below with reference to the drawings.

[0026] In the description of the utility model, it is understood that the orientation or position relationship indicated by the terms "upper", "lower" and the like is based on the orientation or position relationship when the product is normally used.

[0027] The terms "first", "second" are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one feature.

[0028] The following will be combined with the drawings Figures 1-5 The application is further described in detail.

[0029] In a first aspect, this utility model embodiment provides an electric grinding head, referring to... Figure 1 and Figure 2 The electric grinding head includes a grinding head housing 1, a spindle 2, and a grinding wheel ring 3. The spindle 2 is inserted inside the grinding head housing 1 and rotatably connected to it; one end of the spindle 2 protrudes from the grinding head housing 1 and is connected to the grinding wheel ring 3. The grinding wheel ring 3 rotates synchronously with the spindle 2 to grind the workpiece. Multiple water tanks 11 are spaced apart circumferentially on the outer wall of the grinding head housing 1. Adjacent water tanks 11 are interconnected, and flowing cooling water passes through each water tank 11, forming water cooling to achieve a temperature reduction effect.

[0030] In detail, one end of the grinding head housing 1 has a mounting groove 12, in which a stator and a rotor are installed. The stator is fitted inside the rotor, and the axes of the stator and rotor coincide. When the stator is energized, it generates a magnetic field that drives the rotor to rotate. A tail cap 13 is bolted to the opening of the mounting groove 12 to prevent the stator and rotor from easily detaching from the mounting groove 12. A through hole is formed at the bottom of the mounting groove 12, penetrating the grinding head housing 1. The inner diameter of the through hole is smaller than the groove diameter of the mounting groove 12. The spindle 2 is inserted into the rotor and the through hole from the opening of the mounting groove 12. The spindle 2 is connected to the rotor and rotates synchronously. The end of the spindle 2 away from the tail cap 13 protrudes from the grinding head housing 1 through the through hole.

[0031] Reference Figure 2 and Figure 3 The end of the grinding head housing 1 furthest from the tail cover 13 is bolted to a front cover 14. The end of the spindle 2 furthest from the tail cover 13 passes through the front cover 14 and is exposed externally. Let the end of the spindle 2 passing through the front cover 14 be the front end. A flange 15 is fitted and fixedly mounted on the front end of the spindle 2. The flange 15 is located on the side of the front cover 14 furthest from the grinding head housing 1, and rotates synchronously with the spindle 2. The grinding wheel ring 3 is located on the side of the flange 15 furthest from the front cover 14 and is bolted to the flange 15. Therefore, when the electric grinding head is powered on, the spindle 2 can drive the flange 15 to drive the grinding wheel ring 3 to rotate synchronously.

[0032] A water baffle 16 is fitted and fixedly installed on the front cover 14. The outer diameter of the water baffle 16 is larger than the outer diameter of the grinding wheel ring 3. This prevents the coolant splashed during grinding from easily entering the grinding head housing 1 and affecting the stator and rotor.

[0033] Combination Figure 1 Reference Figure 2 and Figure 4The multiple water containing grooves 11 are arranged at intervals in the circumferential direction of the rotor, and the stator and the rotor are both located within the length range of the water containing groove 11, so that the stator and the rotor are all located within the cooling range of the water containing groove 11, thereby improving the cooling effect. Since the inner diameter of the through hole is smaller than the inner diameter of the mounting groove 12, the thickness at the through hole is greater than the thickness at the mounting groove 12. Correspondingly, the depth of the water containing groove 11 at the through hole is deeper than the depth of the water containing groove 11 at the mounting groove 12, so that the cooling water in the water containing groove 11 at the through hole is closer to the main shaft 2 at this position, and the cooling effect is better.

[0034] In combination Figure 1 With reference to Figure 3 And Figure 4 The outer wall of the grinding head shell 1 is provided with a water inlet joint 17 and a water outlet joint 18. The water inlet joint 17 is adapted to introduce cooling water through a water pipe. The water inlet joint 17 and the water outlet joint 18 are respectively communicated with two water containing grooves 11 at the two ends in the arrangement direction of the multiple water containing grooves 11, so that the cooling water is sequentially discharged from the water outlet joint 18 after passing through the multiple water containing grooves 11. Water through holes are formed in the groove walls of the adjacent two water containing grooves 11, so that the adjacent two water containing grooves 11 are communicated with each other.

[0035] It is worth noting that the width direction of the water containing groove 11 is the extending direction of the water containing groove 11 along the circumferential direction of the rotor. The structures at different positions of the grinding head shell 1 result in different widths of the multiple grinding head shells 1. The water containing groove 11 with a larger width is integrally formed with multiple partition plates 111. The multiple partition plates 111 are arranged at intervals in the width direction of the water containing groove 11. The water containing groove 11 is divided into multiple sub-flow grooves by the multiple partition plates 111. The partition plate 111 is provided with a notch 1111 near the corresponding sealing cover plate 112. The adjacent two sub-flow grooves are communicated through the notch 1111. Among them, one notch 1111 on the adjacent two partition plates 111 is near the front end of the main shaft 2, and the other notch 1111 is near the rear end of the main shaft 2. In this way, the cooling water flows in an S shape in the multiple sub-flow grooves, increasing the flow time of the cooling water and improving the cooling effect.

[0036] In combination Figure 1 With reference to Figure 3 And Figure 4 The sealing cover plate 112 is mounted on the opening of the multiple water containing grooves 11 through bolts. The sealing cover plate 112 is adapted to shield and seal the opening of the corresponding water containing groove 11. The side of the partition plate 111 close to the sealing cover plate 112 abuts against the sealing cover plate 112, so that the water in the adjacent two sub-flow grooves is not easy to flow through the contact part of the partition plate 111 and the sealing cover plate 112.

[0037] With reference to Figure 4 And Figure 5In order to further increase the sealing effect of the sealing cover plate 112 on the water tank 11 after installation, the sealing ring 19 is arranged at the opening of the water tank 11, and the opposite sides of the sealing ring 19 are abutted against the grinding head shell 1 and the sealing cover plate 112. The opening of the water tank 11 is provided with a first sealing groove, and the side of the sealing cover plate 112 close to the grinding head shell 1 is provided with a second sealing groove, and the opposite sides of the sealing ring 19 are inserted into the first sealing groove and the second sealing groove in an interference fit. After installation, the sealing cover plate 112 will extrude the sealing ring 19 with the grinding head shell 1 to achieve a sealing effect.

[0038] The inner wall and the outer wall of the sealing ring 19 are integrally formed with a protruding ring 191, and the opposite two groove walls of the first sealing groove are provided with clamping grooves, and the protruding ring 191 is clamped in the corresponding clamping groove in an interference fit, so that the sealing ring 19 is not easy to fall off when the sealing cover plate 112 is disassembled.

[0039] Referring to Figure 4 And Figure 5 The inner wall of the sealing ring 19 is provided with a plurality of ring grooves 192, and the plurality of ring grooves 192 are arranged in a spaced manner along the direction of the grinding head shell 1 close to the sealing cover plate 112. On the one hand, the plurality of ring grooves 192 are arranged to make the sealing ring 19 more easily deformed after being extruded; on the other hand, a layer structure is formed between the adjacent two ring grooves 192, and the plurality of ring grooves 192 are arranged to form a plurality of layers in a spaced manner, so that the sealing ring 19 is extruded to form a multiple sealing effect, thereby improving the sealing performance.

[0040] The implementation principle of the electric grinding head in the embodiment of the present application is that the stator and the rotor of the motor are installed in the grinding head shell 1 and the main shaft 2 is connected with the rotor. Compared with the external motor, the main components of the motor can be integrated in the grinding head shell 1 to directly drive the grinding wheel ring 3 to rotate, thereby reducing the connecting parts and improving the stability of the grinding wheel disc during grinding. The length of the water tank 11 is greater than that of the stator and the rotor, and the cooling range is wide. In addition, the arrangement of the partition plate 111 can make the cooling water flow in an S shape, thereby increasing the flow time of the cooling water. The water cooling replaces the heat dissipation fins, and the cooling and cooling are not affected by the external air temperature.

[0041] In a second aspect, the utility model provides another embodiment of a direct drive type angle grinder, which is installed with the electric grinding head in the first aspect.

[0042] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the utility model.

Claims

1. An electrically powered abrasive head, characterized by: The grinding head shell (1) is internally provided with a stator and a rotor, the main shaft (2) is inserted into the inside of the grinding head shell (1) and the rotor, the main shaft (2) rotates synchronously with the rotor, one end of the main shaft (2) protrudes from the grinding head shell (1) and is connected with the grinding wheel ring (3), and the grinding wheel ring (3) rotates synchronously with the main shaft (2).

2. The motorized abrasive head of claim 1, wherein: The outer wall of the grinding head shell (1) is circumferentially spaced apart and provided with a plurality of water containing grooves (11), adjacent two water containing grooves (11) are communicated with each other, a plurality of water containing grooves (11) are detachably provided with sealing cover plates (112) at the groove openings, the sealing cover plates (112) are suitable for shielding and sealing the groove openings of the corresponding water containing grooves (11), the outer wall of the grinding head shell (1) is provided with a water inlet connector (17) and a water outlet connector (18), the water inlet connector (17) and the water outlet connector (18) are respectively communicated with two water containing grooves (11) at the two ends in the arrangement direction of the plurality of water containing grooves (11), the water inlet connector (17) is suitable for introducing cooling water through a water pipe, and the water outlet connector (18) is suitable for discharging the cooling water sequentially passing through the plurality of water containing grooves (11).

3. The motorized abrasive head of claim 1, wherein: The grinding wheel ring (3) is provided with a water baffle (16) on the side close to the grinding head shell (1), and the outer diameter of the water baffle (16) is greater than the outer diameter of the grinding wheel ring (3).

4. The motorized abrasive head of any one of claims 1-3, wherein: The stator and the rotor are located within the length range of the water containing groove (11), and a plurality of water containing grooves (11) are arranged in the circumferential direction of the rotor.

5. The motorized abrasive head of claim 4, wherein: A plurality of partition plates (111) are arranged in the water containing groove (11), and the water containing groove (11) is divided into a plurality of sub-flow grooves by the plurality of partition plates (111), adjacent two sub-flow grooves are communicated with each other, and the cooling water flows in an S shape in the plurality of sub-flow grooves.

6. The motorized abrasive head of claim 4, wherein: The partition plate (111) is provided with a notch (1111) on the side close to the corresponding sealing cover plate (112), and adjacent two sub-flow grooves are communicated through the notch (1111).

7. The motorized abrasive head of claim 6, wherein: The groove opening of the water containing groove (11) is provided with a sealing ring (19), and the opposite sides of the sealing ring (19) are abutted against the grinding head shell (1) and the sealing cover plate (112) respectively.

8. The motorized abrasive head of claim 7, wherein: The groove opening of the water containing groove (11) is provided with a first sealing groove, the side of the sealing cover plate (112) close to the grinding head shell (1) is provided with a second sealing groove, and the opposite sides of the sealing ring (19) are inserted into the first sealing groove and the second sealing groove in an interference fit.

9. The motorized abrasive head of claim 6, wherein: The inner wall and the outer wall of the sealing ring (19) are provided with convex rings (191), the opposite two groove walls of the first sealing groove are provided with clamping grooves, and the convex rings (191) are clamped in the corresponding clamping grooves in an interference fit.

10. A direct drive angle grinder, characterized by The inner wall of the sealing ring (19) is provided with a plurality of ring grooves (192), and the plurality of ring grooves (192) are arranged in the direction of the grinding head shell (1) close to the sealing cover plate (112). The electric grinding head comprises the electric grinding head as claimed in any one of claims 1-9.

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