Motor shaft and motor

Abstract

The application relates to a motor shaft, which comprises a first shaft section, a second shaft section and a third shaft section, the first shaft section is used for being connected with an output end of a motor, two ends of the second shaft section are respectively connected with the first shaft section and the third shaft section, and the third shaft section is used for being connected with a grinding head; an outlet water channel is arranged on an end face of the third shaft section away from the second shaft section, the outlet water channel extends to the second shaft section, a plurality of inlet water channels are arranged in the second shaft section and are communicated with the outlet water channel, all the inlet water channels are arranged at intervals around the axial direction of the second shaft section, and the inlet end of each inlet water channel penetrates through the circumferential wall of the second shaft section to be communicated with a water injection port; the inlet water channel is spirally arranged, and when the first shaft section rotates, the inlet end of the inlet water channel faces the water flow direction of the water injection port. The motor shaft can improve the flow speed of cooling water. The application also relates to a motor.

Description

Technical Field

[0001] This application relates to the technical field of electric motors, and in particular to an electric motor shaft and an electric motor. Background Technology

[0002] The grinding head in the grinding equipment needs to be driven by a motor to rotate so that the grinding head can grind the surface of the object. During the grinding process, the grinding head will generate heat, so it is necessary to dissipate heat in time. In order to avoid the problem of overheating of the grinding head during the grinding process, water-powered motors have been developed in related technologies.

[0003] The existing water-discharge motor includes a motor, a mounting base, and a motor shaft. The mounting base has a through-hole. One end of the motor shaft is connected to the output end of the motor, and the other end passes through the through-hole and is connected to the grinding head. The side wall of the mounting base has a water inlet connected to the through-hole. The motor shaft has a water outlet channel. One end of the water outlet channel passes through the end of the motor shaft near the grinding head, and the other end is connected to the water inlet. Cooling water is introduced into the water inlet, and the cooling water can flow to the grinding head through the water outlet channel to dissipate heat from the grinding head, thereby reducing the possibility of the grinding head overheating.

[0004] However, during the rotation of the grinding head driven by the motor shaft, the cooling water flows from the inlet to the outlet channel. Because the motor shaft is rotating continuously, the speed at which the cooling water flows from the inlet to the outlet channel is relatively slow, which reduces the effect of the cooling water on the grinding head. Therefore, further improvements are needed. Summary of the Invention

[0005] To increase the flow rate of cooling water, this application provides a motor shaft and a motor.

[0006] Firstly, the motor shaft provided in this application adopts the following technical solution:

[0007] A motor shaft includes a first shaft segment, a second shaft segment, and a third shaft segment. The first shaft segment is used to connect to the output end of a motor. The two ends of the second shaft segment are respectively connected to the first shaft segment and the third shaft segment. The third shaft segment is used to connect to a grinding head. A water outlet channel is formed on the end face of the third shaft segment away from the second shaft segment. The water outlet channel extends to the second shaft segment. The second shaft segment has multiple water inlet channels that communicate with the water outlet channel. All water inlet channels are arranged at intervals around the axial direction of the second shaft segment. The inlet end of each water inlet channel penetrates the peripheral wall of the second shaft segment to connect to a water inlet. The water inlet channels are spirally arranged. When the first shaft segment rotates, the inlet end of the water inlet channel faces the water flow direction of the water inlet.

[0008] By adopting the above technical solution, through the setting of the outlet and inlet channels, the outlet channel is connected to the water inlet through multiple inlet channels. The multiple inlet channels increase the speed at which cooling water enters the outlet channel, allowing the cooling water to act on the grinding head in a timely manner and improving the heat dissipation effect of the cooling water on the grinding head. On the other hand, the inlet channel is spirally arranged, and when the first shaft section rotates, the inlet end of the inlet channel faces the water flow direction of the water inlet, making it easier for the cooling water from the water inlet to enter the inlet channel and then enter the outlet channel. After the cooling water enters the spirally arranged inlet channel, with the continuous rotation of the first shaft section, the cooling water forms a vortex in the inlet channel, thereby pressurizing the cooling water entering the inlet channel and causing the cooling water to flow quickly to the outlet channel, greatly increasing the flow rate of the cooling water and improving the heat dissipation effect of the cooling water on the grinding head.

[0009] Optionally, the outer peripheral wall of the second shaft segment is provided with a plurality of pyramidal blocks protruding outwards, and a drainage groove is formed between two adjacent pyramidal blocks. The inlet end of the water inlet channel is connected to the drainage groove.

[0010] By adopting the above technical solution, multiple pyramidal blocks are set to form multiple drainage channels. The drainage channels can guide the cooling water to the inlet end of the water inlet channel, thereby improving the efficiency of cooling water entering the water inlet channel.

[0011] Optionally, the end face of the first shaft segment near the second shaft segment and the end face of the third shaft segment near the second shaft segment are provided with connecting grooves. Both ends of the second shaft segment are provided with connecting parts for insertion into the connecting grooves. The outer peripheral wall of each connecting part is provided with a connecting ring. The connecting ring is threadedly connected to the connecting groove, and the thread tightening direction of the connecting ring is opposite to the rotation direction of the first shaft segment.

[0012] By adopting the above technical solution, and through the setting of the connecting ring, the first shaft segment and the second shaft segment, as well as the third shaft segment and the second shaft segment, are all connected by the connecting ring thread, so that the first shaft segment, the second shaft segment, and the third shaft segment are connected as a whole motor shaft. The screwing direction of the connecting ring is set in the opposite direction to the rotation direction of the first shaft segment, so that when the motor shaft rotates, the first shaft segment and the second shaft segment, as well as the third shaft segment and the second shaft segment, can be screwed tighter and tighter, which greatly improves the stability of the overall structure.

[0013] Optionally, each of the connecting rings has a mating ring on its outer peripheral wall, the mating ring having a plurality of first mating holes, and the end face of the second shaft segment having a plurality of second mating holes corresponding to the first mating holes; a mating rod is inserted into each of the second mating holes, the two ends of the mating rod being respectively inserted into the first mating holes of the two mating rings, a mating nut being provided in the first mating hole, the mating nut being sleeved on the mating rod and threadedly connected to the mating rod.

[0014] By adopting the above technical solution, through the setting of the docking ring and the docking rod, the two ends of the docking rod are connected into a whole by the docking nut. On the one hand, the docking rod connects the two connecting rings into a whole, improving the connection strength between the first shaft segment and the third shaft segment; on the other hand, multiple docking rods are inserted one by one into the second docking hole of the second shaft segment, and the multiple docking rods can serve as the support skeleton of the second shaft segment, greatly improving the structural strength of the second shaft segment, thereby improving the stability of the overall structure.

[0015] Optionally, the second shaft section is provided with a water outlet pipe, the outlet end of which is connected to the water outlet channel of the third shaft section; the inlet end of the water outlet pipe is connected to multiple water inlet pipes, the inlet end of which penetrates the outer peripheral wall of the second shaft section to connect to the water inlet, the outlet end of which is connected to the inlet end of the water outlet pipe, and the water inlet pipes are spirally arranged to form the water inlet channel.

[0016] By adopting the above technical solution, the space inside the water inlet pipe forms a water inlet channel through the setting of the water outlet pipe and the water inlet pipe. By using the pipe wall of the water inlet pipe as the inner wall of the water inlet channel, the impact resistance of the inner wall of the water inlet channel is improved, and the possibility of deformation of the inner wall of the water inlet channel caused by long-term impact of cooling water is reduced. At the same time, in the process of manufacturing the water inlet pipe, the water inlet pipe is made into a spiral shape in advance, thereby forming a spiral water inlet channel, which can reduce the manufacturing difficulty of the second shaft section.

[0017] Optionally, the outlet end of the water outlet pipe extends into the third shaft section and is fixed with a reducing joint. The large end of the reducing joint is connected to the outlet end of the water outlet pipe, and the small end of the reducing joint is connected to the water outlet channel of the third shaft section.

[0018] By adopting the above technical solution, and by setting up the reducing joint, when the cooling water flows from the inlet channel to the outlet channel, the flow area of ​​the reducing joint is reduced after the cooling water passes through the reducing joint, so that the cooling water is further pressurized in the reducing joint, thereby increasing the flow rate of the cooling water again.

[0019] Optionally, the number of connecting rods corresponds to the number of water inlet pipes, and the outer wall of each water inlet pipe abuts against the corresponding connecting rod, with the connecting rod supported on the outside of the spiral arc of the water inlet pipe.

[0020] By adopting the above technical solution, during the rotation of the second shaft section, the cooling water forms a vortex in the water inlet pipe (water inlet channel), which creates a certain impact force on the inner wall of the water inlet pipe. By abutting the connecting rod against the outside of the spiral arc of the water inlet pipe, the connecting rod can provide support for the water inlet pipe, thereby improving the stability of the overall structure.

[0021] Optionally, the outer peripheral wall of the water inlet pipe is provided with a reinforcing strip, the two ends of which extend along the spiral trajectory of the water inlet pipe and the reinforcing strip is located outside the spiral arc of the water inlet pipe; the reinforcing strip is provided with a positioning ring for the connecting rod to pass through, and the connecting rod abuts against the water inlet pipe through the positioning ring.

[0022] By adopting the above technical solution and by setting the reinforcing strip, the structural stability of the water inlet pipe is further improved, and the impact force on the water inlet pipe is concentrated in the positioning ring and transmitted to the docking rod through the positioning ring.

[0023] Optionally, annular weld seams are provided between the first shaft segment and the second shaft segment, and between the third shaft segment and the second shaft segment, and welding strips are provided in the weld seams.

[0024] By adopting the above technical solution, and by setting up welding seams and welding rods, the first shaft segment and the second shaft segment, and the third shaft segment and the second shaft segment are connected by connecting ring thread to form an integral whole. Welding rods are then welded to the welding seams between the first shaft segment and the second shaft segment and between the third shaft segment and the second shaft segment, so that the first shaft segment, the second shaft segment and the third shaft segment form an integral whole, thereby further improving the strength of the overall structure.

[0025] Secondly, the motor provided in this application adopts the following technical solution:

[0026] An electric motor includes an electric motor, a mounting base, and the aforementioned electric motor shaft. The mounting base has a through-channel through which the electric motor shaft passes. One end of the electric motor shaft is connected to the output end of the electric motor, and the other end passes through the through-channel and is used to connect a grinding head. The mounting base has a water inlet communicating with the through-channel.

[0027] By adopting the above technical solution, the motor is started to drive the motor shaft to rotate, which in turn drives the grinding head to rotate for grinding operations. During the rotation of the motor shaft, cooling water is introduced into the water inlet. The cooling water can flow through the water inlet to the water outlet channel and then to the grinding head to dissipate heat from the grinding head.

[0028] In summary, this application includes at least one of the following beneficial technical effects:

[0029] 1. By designing an outlet and inlet water channels, the outlet water channel is connected to the water inlet via multiple inlet water channels. These multiple inlet water channels increase the speed at which cooling water enters the outlet water channel, allowing the cooling water to act on the grinding head in a timely manner and improving the cooling effect of the cooling water on the grinding head. On the other hand, the inlet water channel is spirally arranged, and when the first shaft section rotates, the inlet end of the inlet water channel faces the direction of the water flow from the water inlet, making it easier for the cooling water from the water inlet to enter the inlet water channel and then enter the outlet water channel. After the cooling water enters the spirally arranged inlet water channel, as the first shaft section continues to rotate, the cooling water forms a vortex within the inlet water channel, thereby pressurizing the cooling water entering the inlet water channel and causing it to flow rapidly towards the outlet water channel, greatly increasing the flow rate of the cooling water and improving the cooling effect of the cooling water on the grinding head.

[0030] 2. By setting up the docking rings and docking rods, the two ends of the docking rods are connected to the two docking rings into a whole by docking nuts. On the one hand, the docking rods connect the two connecting rings into a whole, improving the connection strength between the first shaft segment and the third shaft segment; on the other hand, multiple docking rods are inserted one by one into the second docking hole of the second shaft segment. The multiple docking rods can serve as the support skeleton of the second shaft segment, greatly improving the structural strength of the second shaft segment, thereby improving the stability of the overall structure.

[0031] 3. By setting up a reducing joint, when the cooling water flows from the inlet channel to the outlet channel, the flow area of ​​the reducing joint is reduced after the cooling water passes through the reducing joint, which further pressurizes the cooling water in the reducing joint, thereby increasing the flow rate of the cooling water again. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the overall structure of Example 1;

[0033] Figure 2 This is a partial cross-sectional view of the water flow channel in Example 1;

[0034] Figure 3 This is a schematic diagram illustrating the structure of the water inlet channel in Example 1;

[0035] Figure 4 This is a partial cross-sectional view of the connecting ring in Embodiment 2;

[0036] Figure 5 This is an exploded view of the connecting ring shown in Example 2;

[0037] Figure 6 This is an exploded view of the docking ring shown in Example 3;

[0038] Figure 7 This is a partial sectional view of the connecting rod in Embodiment 3;

[0039] Figure 8Example 4 is a schematic diagram showing the explosion of the water pipe and the inlet pipe;

[0040] Figure 9 This is a partial sectional view of the connecting rod in Example 4;

[0041] Figure 10 This is a partial sectional view of the connecting rod in Example 5;

[0042] Figure 11 This is a schematic diagram of the overall structure of Example 6.

[0043] Explanation of reference numerals in the attached drawings: 1. First shaft section; 2. Second shaft section; 21. Water inlet channel; 22. Connecting part; 221. Limiting groove; 23. Connecting ring; 231. Limiting strip; 24. Butt ring; 241. First butt hole; 25. Second butt hole; 26. Butt rod; 27. Butt nut; 28. Clearance groove; 29. ​​Pyramidal block; 291. Drainage groove; 3. Third shaft section; 31. Water outlet channel; 32. Connecting groove; 33. Weld seam; 34. Welding strip; 4. Water outlet pipe; 41. Reducing joint; 5. Water inlet pipe; 51. Reinforcing strip; 52. Positioning ring; 6. Motor; 7. Mounting base; 71. Through-hole; 72. Water inlet; 8. Coupling. Detailed Implementation

[0044] The following is in conjunction with the appendix Figure 1-11 This application will be described in further detail.

[0045] Example 1:

[0046] This application discloses a motor shaft.

[0047] Reference Figure 1 , Figure 2 A motor shaft includes a first shaft segment 1, a second shaft segment 2, and a third shaft segment 3, which are coaxially arranged. The two ends of the second shaft segment 2 are connected to the first shaft segment 1 and the third shaft segment 3, respectively. The end of the first shaft segment 1 away from the second shaft segment 2 is used to connect to the output end of the motor 6, and the end of the third shaft segment 3 away from the second shaft segment 2 is used to connect to the grinding head. The motor 6 drives the first shaft segment 1 to rotate, thereby driving the second shaft segment 2 and the third shaft segment 3 to rotate synchronously, thus driving the grinding head to rotate for grinding operations.

[0048] Reference Figure 1 , Figure 2In this application, a water outlet channel 31 is provided on the end face of the third shaft segment 3 away from the second shaft segment 2. One end of the water outlet channel 31 extends to the second shaft segment 2, and the axial direction of the water outlet channel 31 coincides with the axial direction of the third shaft segment 3. A plurality of water inlet channels 21 are provided in the second shaft segment 2. In this embodiment, the number of water inlet channels 21 is set to three, and the three water inlet channels 21 are arranged at intervals around the axial direction of the second shaft segment 2. The outlet end of each water inlet channel 21 is connected to the water outlet channel 31 in the second shaft segment 2, and the inlet end of each water inlet channel 21 penetrates the peripheral wall of the second shaft segment 2 to connect to the water inlet 72.

[0049] Reference Figure 2 , Figure 3 In this embodiment, each water inlet channel 21 is spirally arranged. The inlet end of the water inlet channel 21 is located on the side away from the outlet end of the water inlet channel 21 from the third shaft segment 3. When the first shaft segment 1 rotates, the inlet end of the water inlet channel 21 faces the water flow direction of the water inlet 72.

[0050] Reference Figure 1 , Figure 2 In this embodiment, the outer diameter of the first shaft segment 1 is adapted to the outer diameter of the third shaft segment 3. The outer diameter of the first shaft segment 1 is larger than the outer diameter of the second shaft segment 2. The outer peripheral wall of the second shaft segment 2 is integrally formed with multiple pyramidal blocks 29. All pyramidal blocks 29 are evenly arranged along the outer peripheral wall of the second shaft segment 2 so that the outer peripheral wall of the second shaft segment 2 forms a lattice structure. The pyramidal blocks 29 are pyramidal in shape, and a drainage groove 291 is formed between two adjacent pyramidal blocks 29. The inlet end of the water inlet channel 21 is connected to the drainage groove 291.

[0051] Reference Figure 1 , Figure 2 , Figure 3 It should be noted that the first shaft segment 1, the second shaft segment 2, and the third shaft segment 3 in this application are integrally formed. The first shaft segment 1, the second shaft segment 2, and the third shaft segment 3 are all 3D printed, that is, the metal additive manufacturing process is used to form a lattice structure on the outer surface of the second shaft segment 2 to reduce the weight of the second shaft segment 2 and form the water outlet channel 31 and the spiral water inlet channel 21 of the second shaft segment 2.

[0052] The implementation principle of Embodiment 1 of this application is as follows: The first shaft segment 1, the second shaft segment 2, and the third shaft segment 3 are 3D printed to form a spiral water inlet channel 21; the motor shaft formed by the combination of the first shaft segment 1, the second shaft segment 2, and the third shaft segment 3 passes through the through channel 71 of the mounting base 7, and one end of the motor shaft is connected to the motor 6, and the other end is connected to the grinding head. The motor shaft is driven to rotate by the motor 6 and cool water is injected into the water inlet channel 21 through the water inlet 72 of the mounting base 7. The inlet end of the water inlet channel 21 faces the water flow direction of the water inlet 72, making it easier for the cool water in the water inlet 72 to enter the water inlet channel 21; as the first shaft segment 1 continues to rotate, the cool water forms a vortex in the spiral water inlet channel 21, thereby pressurizing the cool water in the water inlet channel 21, increasing the flow rate of the cool water, and thus improving the heat dissipation effect of the cool water on the grinding head.

[0053] Example 2:

[0054] This application discloses a motor shaft.

[0055] Reference Figure 4 , Figure 5 The difference between the motor shaft disclosed in this application and that in embodiment 1 is that:

[0056] In this embodiment, the end face of the first shaft segment 1 near the second shaft segment 2 and the end face of the third shaft segment 3 near the second shaft segment 2 are both provided with connecting grooves 32, and the cross-sectional shape of the connecting grooves 32 is circular; both ends of the second shaft segment 2 are provided with connecting parts 22 protruding from them, and the second shaft segment 2 and the two connecting parts 22 are integrally formed, and the connecting parts 22 are used to be inserted into the connecting grooves 32; it should be noted that in this embodiment, the outer diameter of the first shaft segment 1 is adapted to the outer diameter of the second shaft segment 2, the second shaft segment 2 is made by 3D printing, that is, it is made by metal additive manufacturing process, and the first shaft segment 1 and the third shaft segment 3 are both made by metal subtractive manufacturing process, that is, the water outlet channel 31 of the third shaft segment 3 is formed by cutting.

[0057] Reference Figure 4 , Figure 5 Each connecting part 22 has a connecting ring 23 fixedly installed on its outer peripheral wall. The connecting ring 23 is sleeved on the outer peripheral wall of the connecting part 22. Multiple limiting strips 231 are fixedly installed on the inner peripheral wall of the connecting ring 23. All limiting strips 231 are arranged at intervals around the axial direction of the second shaft segment 2. Multiple limiting grooves 221 are opened on the outer peripheral wall of the connecting part 22. All limiting grooves 221 are correspondingly set with all limiting strips 231. When the connecting ring 23 is sleeved on the outer peripheral wall of the connecting part 22, the limiting strips 231 are matched and embedded in the corresponding limiting grooves 221. It should be noted that when the connecting ring 23 is sleeved on the outer peripheral wall of the connecting part 22, metal adhesive needs to be applied to the outer peripheral wall of the connecting part 22 so that the connecting ring 23 and the connecting part 22 are connected as a whole.

[0058] Reference Figure 4 , Figure 5 The outer diameter of the connecting ring 23 is adapted to the inner diameter of the connecting groove 32. The connecting ring 23 and the connecting groove 32 are threaded together, and the thread tightening direction of the connecting ring 23 is opposite to the rotation direction of the first shaft segment 1.

[0059] Reference Figure 4 , Figure 5 In this embodiment, the outer peripheral wall at the connection between the first shaft segment 1 and the second shaft segment 2, and the outer peripheral wall at the connection between the third shaft segment 3 and the second shaft segment 2 are both provided with welding seams 33. The welding seams 33 are arranged in a ring around the axial direction of the second shaft segment 2. Welding is performed on the welding seams 33 to form welding strips 34 that fill the welding seams 33. It should be noted that after the welding strips 34 are formed, the surface of the welding strips 34 needs to be ground flat to ensure a smooth transition of the outer peripheral wall of the motor shaft.

[0060] The implementation principle of Embodiment 2 of this application is as follows: When the first shaft segment 1, the second shaft segment 2 and the third shaft segment 3 are connected to each other, the connecting parts 22 at both ends of the second shaft segment 2 are correspondingly inserted into the connecting groove 32 of the first shaft segment 1 or the connecting groove 32 of the third shaft segment 3, so that the connecting ring 23 of the connecting part 22 is threadedly connected to the connecting groove 32. The thread tightening direction of the connecting ring 23 is set in the opposite direction to the rotation direction of the first shaft segment 1, so that when the motor shaft rotates and drives the grinding head to perform grinding operation, the first shaft segment 1, the second shaft segment 2 and the third shaft segment 3 can be tightened more and more, thereby improving the connection stability of the overall structure.

[0061] Example 3:

[0062] This application discloses a motor shaft.

[0063] Reference Figure 6 The difference between the motor shaft disclosed in this application embodiment and that in embodiment 2 is that:

[0064] In this embodiment, the end face of the second shaft segment 2 near the first shaft segment 1 and the end face of the second shaft segment 2 near the third shaft segment 3 are provided with relief grooves 28. The end of each connecting ring 23 near the second shaft segment 2 extends into the corresponding relief groove 28 and is fixedly connected with a docking ring 24. The docking ring 24 is coaxially arranged with the second shaft segment 2, and the docking ring 24 is embedded in the relief groove 28 and the end face of the docking ring 24 is flush with the end face of the second shaft segment 2.

[0065] Reference Figure 6 , Figure 7The docking ring 24 has multiple first docking holes 241, and all the first docking holes 241 are arranged at intervals around the axial direction of the second shaft segment 2. In this embodiment, the first docking holes 241 are countersunk holes. The end face of the second shaft segment 2 has multiple second docking holes 25, and all the second docking holes 25 are arranged at intervals around the axial direction of the second shaft segment 2. Each second docking hole 25 is a through hole that penetrates both ends of the second shaft segment 2. All the first docking holes 241 are correspondingly set with all the second docking holes 25.

[0066] Reference Figure 6 Each first mating hole 241 is equipped with a mating nut 27, and each second mating hole 25 is equipped with a mating rod 26. The two ends of the mating rod 26 are respectively inserted into the first mating holes 241 of the two mating rings 24, and are threadedly connected to the mating nuts 27 in the two first mating holes 241.

[0067] The implementation principle of Embodiment 3 of this application is as follows: On the one hand, multiple connecting rods 26 are inserted into the second shaft segment 2, and the multiple connecting rods 26 serve as the supporting skeleton of the second shaft segment 2 to improve the structural strength of the second shaft segment 2; on the other hand, the two ends of the connecting rods 26 are connected to the two connecting rings 24 into a whole by connecting nuts 27, thereby connecting the two connecting rings 23 into a whole, improving the connection stability between the connecting rings 23 and the second shaft segment 2, and thus improving the structural stability between the first shaft segment 1, the second shaft segment 2 and the third shaft segment 3.

[0068] Example 4:

[0069] This application discloses a motor shaft.

[0070] Reference Figure 8 , Figure 9 The difference between the motor shaft disclosed in this application embodiment and embodiment 3 is that:

[0071] In this embodiment, a water outlet pipe 4 is installed inside the second shaft segment 2. The outlet end of the water outlet pipe 4 is connected to the water outlet channel 31 of the third shaft segment 3, and the water outlet pipe 4 forms the water outlet channel 31 of the second shaft segment 2. Multiple water inlet pipes 5 are fixedly installed at the inlet end of the water outlet pipe 4. All water inlet pipes 5 are arranged at intervals around the axial direction of the second shaft segment 2. The outlet end of the water inlet pipe 5 is connected to the inlet end of the water outlet pipe 4. The inlet end of the water inlet pipe 5 penetrates the outer peripheral wall of the second shaft segment 2 to connect to the water inlet 72. In this embodiment, the water inlet pipes 5 are arranged in a spiral to form the water inlet channel 21 of the second shaft segment 2.

[0072] It should be noted that the water outlet pipe 4 and the water inlet pipe 5 are prefabricated parts. After the water outlet pipe 4 and the water inlet pipe 5 are prepared, the second shaft segment 2 is made on the outside of the water outlet pipe 4 and the water inlet pipe 5 by 3D printing, thereby forming the water outlet channel 31 and the water inlet channel 21 of the second shaft segment 2. The number of connecting rods 26 corresponds to the number of water inlet pipes 5. When the connecting rod 26 passes through the second connecting hole 25, the outer wall of the water inlet pipe 5 abuts against the outer peripheral wall of the corresponding connecting rod 26, and the connecting rod 26 is supported on the outside of the spiral arc of the water inlet pipe 5.

[0073] Reference Figure 8 When the first shaft segment 1 is connected to the third shaft segment 3, the outlet end of the water outlet pipe 4 extends into the water outlet channel 31 of the third shaft segment 3. A reducing connector 41 is fixedly installed at the outlet end of the water outlet pipe 4. In this embodiment, the large end of the reducing connector 41 is connected to the outlet end of the water outlet pipe 4, and the small end of the reducing connector 41 is connected to the water outlet channel 31 of the third shaft segment 3.

[0074] The implementation principle of Embodiment 4 of this application is as follows: As the motor shaft continues to rotate, the cooling water forms a vortex in the inlet pipe 5, thereby pressurizing the cooling water and causing it to flow rapidly to the outlet channel 31 of the third shaft section 3. When the cooling water passes through the reducing joint 41, the passing area of ​​the reducing joint 41 is reduced, thereby further pressurizing the cooling water and greatly increasing the flow rate of the cooling water, thereby improving the effect of the cooling water on the grinding head. When the cooling water generates a vortex in the spiral inlet pipe 5, the pressurized cooling water has an impact force on the inner wall of the inlet pipe 5. The connecting rod 26 can support the inlet pipe 5 to improve the stability of the overall structure.

[0075] Example 5:

[0076] This application discloses a motor shaft.

[0077] Reference Figure 10 The difference between the motor shaft disclosed in this application embodiment and embodiment 4 is that:

[0078] In this embodiment, a reinforcing strip 51 is fixedly installed on the outer peripheral wall of the water inlet pipe 5. The two ends of the reinforcing strip 51 extend along the spiral trajectory of the water inlet pipe 5, and the reinforcing strip 51 is located outside the spiral arc of the water inlet pipe 5. A positioning ring 52 is fixedly installed on the side wall of the reinforcing strip 51. The positioning ring 52 is located inside the second docking hole 25. The positioning ring 52 is used for the docking rod 26 to pass through. When the docking rod 26 passes through the positioning ring 52, the outer peripheral wall of the docking rod 26 abuts against the inner peripheral wall of the positioning ring 52. The docking rod 26 is supported on the water inlet pipe 5 by the positioning ring 52.

[0079] The implementation principle of Embodiment 5 of this application is as follows: the reinforcing strip 51 can concentrate the impact force received by the water inlet pipe 5 on the positioning ring 52, thereby transmitting it to the docking rod 26 through the positioning ring 52, and improving the support effect of the docking rod 26.

[0080] Example 6:

[0081] This application discloses an electric motor.

[0082] Reference Figure 11 An electric motor includes an electric motor 6, a mounting base 7, and a motor shaft as described in Embodiment 1. The electric motor 6 is fixedly mounted on one side of the mounting base 7. The mounting base 7 has a through-passage 71 for the electric motor shaft to pass through. A coupling 8 is installed between the motor shaft and the electric motor 6. One end of the motor shaft is connected to the output end of the electric motor 6 through the coupling 8, and the other end of the motor shaft passes through the through-passage 71 and is used to connect to a grinding head. The top wall of the mounting base 7 has a water inlet 72, which is connected to the through-passage 71 and the water inlet is connected to the water inlet channel 21 of the motor shaft.

[0083] The implementation principle of Embodiment 6 of this application is as follows: the motor 6 drives the motor shaft to rotate, so that the motor shaft can drive the grinding head to rotate for grinding operations; a large amount of heat is generated during the grinding process of the grinding head, and cooling water is injected into the motor shaft through the water inlet 72. The cooling water can flow to the grinding head through the water outlet 31 to dissipate heat from the grinding head and reduce the possibility of the grinding head overheating.

[0084] The above are preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made to the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A motor shaft, characterized in that: It includes a first shaft segment (1), a second shaft segment (2), and a third shaft segment (3). The first shaft segment (1) is used to connect to the output end of the motor (6). The two ends of the second shaft segment (2) are respectively connected to the first shaft segment (1) and the third shaft segment (3). The third shaft segment (3) is used to connect to the grinding head. A water outlet channel (31) is opened on the end face of the third shaft segment (3) away from the second shaft segment (2). The water outlet channel (31) extends to the second shaft segment (2). 2) It is provided with multiple inlet channels (21) connected to the outlet channel (31). All inlet channels (21) are arranged at intervals around the axial direction of the second shaft section (2). The inlet end of each inlet channel (21) penetrates the peripheral wall of the second shaft section (2) to connect to the water inlet (72). The inlet channels (21) are spirally arranged. When the first shaft section (1) rotates, the inlet end of the inlet channel (21) faces the water flow direction of the water inlet (72). The outer periphery of the second shaft section (2) The wall protrudes with multiple pyramidal blocks (29), and a drainage channel (291) is formed between two adjacent pyramidal blocks (29). The inlet end of the water inlet channel (21) is connected to the drainage channel (291). The second shaft section (2) is provided with a water outlet pipe (4), and the outlet end of the water outlet pipe (4) is connected to the water outlet channel (31) of the third shaft section (3). The inlet end of the water outlet pipe (4) is connected to multiple water inlet pipes (5), and the inlet end of the water inlet pipes (5) penetrates the outer wall of the second shaft section (2). The peripheral wall is used to connect the water inlet (72). The outlet end of the water inlet pipe (5) is connected to the inlet end of the water outlet pipe (4). The water inlet pipe (5) is spirally arranged to form the water inlet channel (21). The outlet end of the water outlet pipe (4) extends into the third shaft section (3) and is fixed with a reducing joint (41). The large end of the reducing joint (41) is connected to the outlet end of the water outlet pipe (4), and the small end of the reducing joint (41) is connected to the water outlet channel (31) of the third shaft section (3).

2. A motor shaft according to claim 1, characterized in that: The end face of the first shaft segment (1) near the second shaft segment (2) and the end face of the third shaft segment (3) near the second shaft segment (2) are provided with connecting grooves (32). Both ends of the second shaft segment (2) are provided with connecting parts (22) for insertion into the connecting grooves (32). Each connecting part (22) has a connecting ring (23) on its outer peripheral wall. The connecting ring (23) is threadedly connected to the connecting groove (32), and the thread tightening direction of the connecting ring (23) is opposite to the rotation direction of the first shaft segment (1).

3. A motor shaft according to claim 2, characterized in that: Each of the connecting rings (23) has a docking ring (24) on its outer peripheral wall. The docking ring (24) has a plurality of first docking holes (241). The end face of the second shaft segment (2) has a plurality of second docking holes (25) corresponding to the first docking holes (241). Each of the second docking holes (25) has a docking rod (26) passing through it. The two ends of the docking rod (26) pass through the first docking holes (241) of the two docking rings (24). The first docking hole (241) has a docking nut (27). The docking nut (27) is sleeved on the docking rod (26) and threadedly connected to the docking rod (26).

4. A motor shaft according to claim 3, characterized in that: The number of connecting rods (26) corresponds to the number of water inlet pipes (5). The outer wall of each water inlet pipe (5) abuts against the corresponding connecting rod (26), and the connecting rod (26) is supported on the outside of the spiral arc of the water inlet pipe (5).

5. A motor shaft according to claim 4, characterized in that: The outer peripheral wall of the water inlet pipe (5) is provided with a reinforcing strip (51). The two ends of the reinforcing strip (51) extend along the spiral trajectory of the water inlet pipe (5), and the reinforcing strip (51) is located outside the spiral arc of the water inlet pipe (5). The reinforcing strip (51) is provided with a positioning ring (52) for the connecting rod (26) to pass through. The connecting rod (26) abuts against the water inlet pipe (5) through the positioning ring (52).

6. A motor shaft according to claim 2, characterized in that: An annular weld seam (33) is provided between the first shaft segment (1) and the second shaft segment (2), and between the third shaft segment (3) and the second shaft segment (2). The weld seam (33) contains a welding strip (34).

7. An electric motor, characterized in that: Includes an electric motor (6), a mounting base (7), and a motor shaft as described in any one of claims 1-6. The mounting base (7) is provided with a through-channel (71) through which the motor shaft passes. One end of the motor shaft is connected to the output end of the electric motor (6), and the other end passes through the through-channel (71) and is used to connect to a grinding head. The mounting base (7) has a water inlet (72) communicating with the through-channel (71).

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