A waterproof grinding head, grinding head assembly and grinding head mechanism

Abstract

The utility model relates to the technical field of polisher, provide a waterproof grinding head, including centre axis, shaft end gland and first end cover, the shaft end gland is sleeved in centre axis periphery and can rotate with the rotation of centre axis, the first end cover is sleeved in shaft end gland, the shaft end gland is equipped with waterproof part, the first end cover is equipped with waterproof cooperation part, the waterproof part and waterproof cooperation part cooperate and form the labyrinth waterproof structure. The waterproof part of shaft end gland and the waterproof cooperation part of first end cover form multistage circuitous passageway, so that water liquid needs to pass through the zigzag complex path to infiltrate inside, can significantly prolong the infiltration path like this, when the shaft end gland follows centre axis rotation, will make the water droplet that adheres produce greater centrifugal force, throw out outward, cannot approach centre axis, like this, utilize the synergies of fluid resistance and centrifugal force, can effectively block the outside liquid invasion grinding head inside. The application also discloses a grinding head assembly and grinding head mechanism.

Description

Technical Field

[0001] This utility model belongs to the field of grinding machine technology, and in particular relates to a waterproof grinding head, grinding head assembly and grinding head mechanism. Background Technology

[0002] Grinding machines, widely used for surface treatment of materials such as metal, wood, and stone, rely on the grinding head assembly for efficient grinding and polishing of workpieces. During grinding operations, to reduce friction temperature, minimize dust pollution, and improve processing accuracy, cooling water is typically sprayed continuously onto the contact area between the grinding head and the workpiece. However, the high-speed rotating grinding head is prone to water mist or droplets splashing under the spray, causing moisture to seep into the interior along the joint between the grinding head and the spindle. Prolonged moisture intrusion can cause spindle bearing corrosion, lubrication failure, and even short circuits in the motor, severely impacting the equipment's lifespan and processing stability.

[0003] To address the aforementioned issues, existing technologies design independent ventilation channels inside the grinding head, injecting high-pressure airflow into these channels via external ventilation equipment to expel infiltrated moisture using airflow pressure. While this approach can prevent moisture intrusion to some extent, it still has significant drawbacks: First, the grinding head requires additional machining of ventilation channels, leading to structural complexity and increasing the difficulty and cost of machining precision components; second, the ventilation equipment needs to operate continuously to maintain airflow pressure, resulting in high long-term energy consumption, which can easily lead to energy waste, especially in large-scale industrial scenarios; furthermore, the layout of the ventilation channels may occupy internal space in the grinding head, affecting its structural strength or heat dissipation performance, and posing a risk of increased grinding head vibration due to airflow disturbance.

[0004] To solve the above-mentioned technical problems, this utility model designs a waterproof grinding head, a grinding head assembly, and a grinding head mechanism. Utility Model Content

[0005] This utility model provides a waterproof grinding head, grinding head assembly, and grinding head mechanism, aiming to solve the problems of relying on active ventilation equipment for waterproofing, high energy consumption, complex structure, and low reliability of waterproofing performance.

[0006] To achieve the above objectives, this utility model provides the following technical solution: a waterproof grinding head, comprising a central shaft, a shaft end cap, and a first end cap. The shaft end cap is sleeved around the central shaft and can rotate with the rotation of the central shaft. The first end cap is sleeved on the shaft end cap. The shaft end cap is provided with a waterproof part. The first end cap is provided with a waterproof mating part. The waterproof part and the waterproof mating part cooperate to form a labyrinth-type waterproof structure.

[0007] Based on the above technical solution, the waterproof part includes a main body and a first protrusion circumferentially disposed on the main body, and the waterproof mating part includes a first groove and a second groove, the second groove being disposed at the bottom of the first groove, the main body being embedded in the first groove, and the first protrusion being embedded in the second groove.

[0008] Furthermore, the first protrusion includes a first segment and a second segment, the first segment being connected to the main body and extending along the axial direction of the central axis, and the second segment being connected to the first segment and extending radially away from the central axis.

[0009] Preferably, the waterproof part further includes a second protrusion, which is circumferentially disposed on the side of the first protrusion near the central axis, and the groove wall of the second groove near the central axis is embedded between the first protrusion and the second protrusion.

[0010] Specifically, the first protrusion and the sidewall of the second groove together form the first annular gap.

[0011] Based on the above technical solution, the central shaft is provided with a first step limiting part in the circumferential direction. The end of the shaft end cap close to the central shaft abuts against the first step limiting part and abuts against the side wall of the central shaft to form an interference fit, so as to fix the shaft end cap to the central shaft.

[0012] Furthermore, the waterproof grinding head also includes a first oil seal, which is circumferentially sleeved on the central shaft. The first end cap extends with a third protrusion in a direction close to the central shaft, and the first oil seal is disposed between the shaft end cap and the third protrusion.

[0013] Preferably, the waterproof grinding head further includes a first angular contact bearing and a second angular contact bearing, which are arranged back-to-back.

[0014] Furthermore, the waterproof grinding head also includes a bearing housing, which is fitted onto the first angular contact bearing and the second angular contact bearing. The bearing housing is provided with a limiting hole, and the first end cover is provided with a through hole. The limiting hole and the through hole pass through a fixing member to fix the first end cover and the bearing housing.

[0015] Secondly, the present invention provides a grinding head assembly, including a grinding drive assembly, a grinding component, and a waterproof grinding head as described in any of the above embodiments, wherein the waterproof grinding head is disposed on the grinding drive assembly, and the grinding component is disposed on the waterproof grinding head.

[0016] Preferably, there are multiple waterproof grinding heads, including a first grinding head and a second grinding head, which are respectively disposed at both ends of the grinding drive assembly.

[0017] Furthermore, the grinding drive assembly includes a first drive unit, with connecting portions at both ends of the first drive unit, and connecting mating portions at both ends of the first grinding head and the second grinding head. The connecting portions and the connecting mating portions cooperate to connect the first grinding head and the first drive unit, as well as the second grinding head and the first drive unit, respectively.

[0018] Thirdly, the present invention provides a grinding head mechanism, including a grinding head assembly as described in any of the above embodiments and a rotary drive assembly for driving the grinding head assembly to rotate.

[0019] Furthermore, the rotary drive assembly includes a second drive unit, a transmission unit, and a reducer. The second drive unit can drive the transmission unit to rotate. The transmission unit is connected to the reducer. The grinding drive assembly is connected to the reducer.

[0020] Compared with related technologies, the beneficial effects of this utility model are as follows: This invention forms a labyrinthine waterproof structure by combining the waterproof part of the shaft end cap with the waterproof mating part of the first end cap. The waterproof part of the shaft end cap and the waterproof mating part of the first end cap form a multi-level meandering channel, forcing liquids such as water to travel through a tortuous and complex path before penetrating the interior. This significantly extends the penetration path. Simultaneously, when the shaft end cap rotates with the central shaft, if water droplets adhere to the shaft end cap, the high-speed rotation of the shaft end cap will generate a relatively large centrifugal force on the adhered water droplets, throwing them outward and preventing water from approaching the central shaft. In this way, by utilizing the synergistic effect of fluid resistance and centrifugal force, external liquids can be effectively blocked from invading the interior of the grinding head. Compared with existing technologies, this invention avoids the use of external ventilation equipment, reduces working energy consumption, eliminates the need for ventilation channels inside the grinding head, simplifies the structure, and reduces processing difficulty and manufacturing costs to a certain extent. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only one embodiment of this utility model. For those skilled in the art, other embodiments can be derived from the provided drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of a waterproof grinding head provided by this utility model; Figure 2 This utility model provides Figure 1 A schematic diagram of the cross-sectional structure along the AA direction shown in the figure; Figure 3 This utility model provides Figure 2 An enlarged structural diagram of part A shown in the figure; Figure 4 This is a schematic diagram of the structure of a grinding head assembly provided by this utility model; Figure 5 This is a schematic diagram of the structure of a grinding head mechanism provided by this utility model; Figure 6 This is a schematic diagram of the internal structure of a grinding head mechanism provided by this utility model; Figure 7 This is a schematic diagram of another grinding head mechanism provided by this utility model; Figure 8 This utility model provides Figure 6 The diagram shows a cross-sectional structure along the BB direction.

[0023] In the diagram: 01. Waterproof grinding head; 1. Central shaft; 11. First step limiting part; 12. Second step limiting part; 2. Shaft end cap; 21. Waterproof part; 211. Main body; 212. First protrusion; 213. Second protrusion; 3. First end cap; 31. Waterproof mating part; 311. First groove; 312. Second groove; 313. First annular gap; 314. Third protrusion; 41. First oil seal; 42. First angular contact bearing; 4 3. Second angular contact bearing; 431. Outer spacer; 432. Inner spacer; 44. Bearing housing; 45. Second oil seal; 46. Second end cover; 47. Fastener; 5. Rotary drive assembly; 51. Second drive unit; 52. Transmission unit; 53. Reducer; 6. Grinding drive assembly; 61. First drive unit; 611. Connecting part; 62. Fixing part; 7. Grinding part; 81. First grinding head; 82. Second grinding head; 83. Connecting mating part. Detailed Implementation

[0024] The present invention will be further described below with reference to the accompanying drawings and examples: The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] In the description of this utility model, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] Example 1 Combination Figure 1-3 As shown, this embodiment of the present disclosure provides a waterproof grinding head, including a central shaft 1, a shaft end cap 2, and a first end cap 3. The shaft end cap 2 is sleeved around the central shaft 1 and can rotate with the rotation of the central shaft 1. The first end cap 3 is sleeved on the shaft end cap 2. The shaft end cap 2 is provided with a waterproof part 21, and the first end cap 3 is provided with a waterproof mating part 31. The waterproof part 21 and the waterproof mating part 31 cooperate to form a labyrinth-type waterproof structure.

[0028] The waterproof grinding head provided in this embodiment of the present disclosure forms a labyrinthine waterproof structure by having the waterproof part 21 of the shaft end cap 2 cooperate with the waterproof mating part 31 of the first end cap 3. The waterproof part 21 of the shaft end cap 2 and the waterproof mating part 31 of the first end cap 3 form a multi-level tortuous channel, so that liquids such as water must go through a tortuous and complex path to penetrate into the interior. This can significantly extend the penetration path. At the same time, when the shaft end cap 2 rotates with the central shaft 1, if water droplets are attached to the shaft end cap 2, the high-speed rotation of the shaft end cap 2 will cause the attached water droplets to generate a relatively large centrifugal force, which will throw the water droplets outward and prevent water from approaching the central shaft 1. In this way, by utilizing the synergistic effect of fluid resistance and centrifugal force, external liquids can be effectively blocked from invading the interior of the grinding head. Compared with the prior art, it can avoid the use of external ventilation equipment, reduce working energy consumption, avoid setting ventilation channels inside the grinding head, simplify the structure, and reduce processing difficulty and manufacturing costs to a certain extent.

[0029] like Figure 3 As shown, based on the above technical solution, the waterproof part 21 includes a main body 211 and a first protrusion 212 circumferentially disposed on the main body 211. The waterproof mating part 31 includes a first groove 311 and a second groove 312. The second groove 312 is disposed at the bottom of the first groove 311. The main body 211 is embedded in the first groove 311, and the first protrusion 212 is embedded in the second groove 312.

[0030] Specifically, the main body 211 is embedded in the first groove 311 to form a primary barrier, and the first protrusion 212 is further embedded in the second groove 312 to form a secondary barrier, thus constituting a two-stage progressive barrier. Liquids such as water or dust must successively break through the primary and secondary barriers. In this way, the penetration path is significantly extended and the path direction changes multiple times, increasing fluid resistance and improving the waterproof effect. Moreover, when the grinding head rotates at high speed, the cooperation between the first protrusion 212 and the second groove 312 can use centrifugal force to throw the infiltrated water outward, and the turbulence effect in the gap further hinders penetration, achieving a combination of static and dynamic protection.

[0031] like Figure 3 As shown, the first protrusion 212 further includes a first segment and a second segment. The first segment is connected to the body 211 and extends along the axial direction of the central axis 1. The second segment is connected to the first segment and extends radially away from the central axis 1.

[0032] Optionally, the extension direction of the first segment may be at a certain angle to the axial direction of the central axis 1, and the extension direction of the second segment may be at a certain angle to the radial direction of the central axis 1. Preferably, the first segment extends along the axial direction of the central axis 1 towards the central axis 1, that is, the distance between the end of the first segment connected to the main body 211 and the central axis 1 is greater than the distance between the other end of the first segment and the central axis 1. The second segment extends along the radial direction of the central axis 1 away from the main body 211, that is, the distance between the end of the second segment connected to the first segment and the main body 211 is less than the distance between the other end of the second segment and the main body 211. In this way, when water enters the gap between the first protrusion 212 and the second groove 312, it will be further restricted by the path direction, increasing the difficulty of water entry and further improving the waterproof effect.

[0033] Preferably, such as Figure 3 As shown, the waterproof part 21 also includes a second protrusion 213, which is circumferentially disposed on the side of the first protrusion 212 near the central axis 1, and the groove wall of the second groove 312 near the central axis 1 is embedded between the first protrusion 212 and the second protrusion 213.

[0034] With the cooperation of the main body 211, the first groove 311, the first protrusion 212, and the second groove 312, water needs to go through five turns before it can reach the central shaft 1. Furthermore, by adding a second protrusion 213, the second groove 312 is embedded between the first protrusion 212 and the second protrusion 213 near the central shaft 1, further increasing the complexity of the path. This means water needs to go through at least seven turns before reaching the central shaft 1. However, under the centrifugal force during rotation, water is unlikely to reach seven turns, greatly improving the waterproofing effect. Moreover, when the grinding head rotates at high speed, the internal temperature rises, and some of the lubricating grease evaporates, causing the internal air pressure of the grinding head to increase, which can also prevent water from entering the grinding head to a certain extent.

[0035] like Figure 3 As shown, further, the first protrusion 212 and the sidewall of the second groove 312 together form a first annular gap 313. Specifically, the first and second segments of the first protrusion 212, the main body 211, and the sidewall of the second groove 312 together form the first annular gap 313. The first annular gap 313 can intercept water when it enters along the gap between the main body 211 and the first groove 311, providing a certain buffer space for the water, and then expelling the water under the action of centrifugal force or the action of higher internal air pressure.

[0036] Based on the above technical solutions, combined with Figure 3 As shown, the central shaft 1 is provided with a first step limiting part 11 in the circumferential direction. The end of the shaft end cap 2 close to the central shaft 1 abuts against the first step limiting part 11 and abuts against the side wall of the central shaft 1 to form an interference fit, so as to fix the shaft end cap 2 to the central shaft 1.

[0037] Specifically, the first step limiting part 11 is provided with a first limiting surface, which extends radially along the central axis 1 and abuts against the side wall of the shaft end cover 2, thereby restricting the movement of the shaft end cover 2 in the axial direction of the central axis 1.

[0038] The shaft end cap 2 is fixed to the central shaft 1 by an interference fit. This avoids the need for an additional fixing component 62, preventing it from affecting the operation of the grinding head. For example, with bolt fixing, the bolts may loosen during prolonged operation in the opposite direction of the thread tightening direction of the grinding head. Furthermore, the split structure between the shaft end cap 2 and the central shaft 1 facilitates the machining of the central shaft 1 and reduces machining costs. The outer cylindrical surface and end face of the central shaft 1 are machined in a single setup on an external cylindrical grinding machine, improving machining accuracy and ensuring the end face runout and radial runout of the central shaft 1. Preferably, the end face runout is less than 0.008 mm, and the radial runout is less than 0.01 mm.

[0039] like Figure 3As shown, the waterproof grinding head 01 further includes a first oil seal 41, which is circumferentially sleeved on the central shaft 1. The first end cap 3 extends a third protrusion 314 along the direction close to the central shaft 1, and the first oil seal 41 is located between the shaft end cap 2 and the third protrusion 314. The first oil seal 41 adds another barrier to the labyrinth waterproof structure. Even if a small amount of water enters, the first oil seal 41 can prevent water from contacting the central shaft 1 over a large area and prevent water from further penetrating components such as bearings.

[0040] Preferably, such as Figure 2 As shown, the waterproof grinding head 01 also includes a first angular contact bearing 42 and a second angular contact bearing 43, which are arranged back to back.

[0041] The first angular contact bearing 42 and the second angular contact bearing 43 are arranged back to back to ensure high precision. The structure can withstand external forces in both the axial and radial directions of the central shaft 1. This ensures the stability of the grinding head when it processes the workpiece in different directions. Moreover, it can self-compensate in the event of wear, further improving stability.

[0042] Specifically, such as Figure 3 As shown, a second step limiting part 12 is provided in the circumferential direction of the central shaft 1. The first angular contact bearing 42 abuts against the second step limiting part 12. The setting of the second step limiting part 12 limits the first angular contact bearing 42 in the axial direction of the central shaft 1.

[0043] An outer spacer 431 and an inner spacer 432 are provided between the first angular contact bearing 42 and the second angular contact bearing 43. The diameter of the outer spacer 431 is larger than the diameter of the inner spacer 432. The inner spacer 432 is located on the side of the first angular contact bearing 42 and the second angular contact bearing 43 closer to the central shaft 1, and the outer spacer 431 is located on the side of the first angular contact bearing 42 and the second angular contact bearing 43 farther away from the central shaft 1.

[0044] Furthermore, such as Figure 2 As shown, the waterproof grinding head 01 also includes a bearing seat 44, which is sleeved on the first angular contact bearing 42 and the second angular contact bearing 43. The bearing seat 44 is provided with a limiting hole, and the first end cover 3 is provided with a through hole. A fixing bolt passes through the limiting hole and the through hole to fix the first end cover 3 and the bearing seat 44.

[0045] like Figure 2As shown, the waterproof grinding head 01 also includes a second oil seal 45, a second end cap 46, and a fastener 47. The second oil seal 45 is sleeved on the central shaft 1, the fastener 47 is sleeved on the second oil seal 45, and the second end cap 46 is sleeved on the fastener 47. The second oil seal 45 and the fastener 47 are pressed onto the second angular contact bearing 43. The second end cap 46 is pressed onto both the second angular contact bearing 43 and the bearing seat 44, cooperating with the first end cap 3 to jointly fix the bearing seat 44, the first angular contact bearing 42, the second angular contact bearing 43, and the central shaft 1. Specifically, the second end cap 46 has a through hole, and the bearing seat 44 has a limiting hole. The fixing bolt passes through the through hole and the limiting hole to fix the second end cap 46 and the bearing seat 44.

[0046] Example 2 Combination Figure 4 As shown, this disclosure provides a grinding head assembly, including a grinding drive assembly 6, a grinding element 7, and a waterproof grinding head 01 as described in any of the above embodiments. The waterproof grinding head 01 is disposed on the grinding drive assembly 6, and the grinding element 7 is disposed on the waterproof grinding head 01.

[0047] The grinding head assembly provided in this embodiment can drive the waterproof grinding head 01 to rotate by setting the grinding drive assembly 6. During the rotation, the waterproof grinding head 01 can be moved quickly and adjusted according to the grinding direction of the workpiece corresponding to the grinding part 7 on the waterproof grinding head 01, thereby improving the grinding efficiency.

[0048] Preferably, such as Figure 4 As shown, there are multiple waterproof grinding heads 01, including a first grinding head 81 and a second grinding head 82, which are respectively disposed at both ends of the grinding drive assembly 6.

[0049] During operation, when the grinding drive assembly 6 drives the waterproof grinding head 01 to rotate, the first grinding head 81 and the second grinding head 82 at both ends of the grinding drive assembly 6 can move or switch positions. Rapid movement or switching during processing can greatly improve processing efficiency. The first grinding head 81 and the second grinding head 82 are respectively equipped with a first grinding element 7 and a second grinding element 7. The first grinding element 7 and the second grinding element 7 can be cylindrical or annular consumables. The cylindrical consumable processes the workpiece through its outer cylindrical surface, while the annular consumable processes the workpiece through its end face, enabling grinding or polishing of the workpiece in different directions and with different roughnesses.

[0050] Specifically, when the grinding part 7 is connected to the waterproof grinding head 01, the cylindrical consumable is provided with a circular groove. The end of the central shaft 1 of the waterproof grinding head 01 is inserted into the circular groove. The circular groove is concentric with respect to the central shaft 1, ensuring that the cylindrical consumable rotates concentrically with the central shaft 1, thereby improving the machining accuracy. On this basis, it is fixedly connected by bolts. The annular consumable is connected to the end of the central shaft 1 through a connecting plate. The annular consumable is attached to the connecting plate, which is provided with fixing holes. Bolts are inserted through the connecting plate and the central shaft 1 for fixed connection, ensuring a low end face runout when the annular consumable processes the workpiece, thereby improving the machining accuracy.

[0051] like Figure 4 and Figure 8 As shown, the grinding drive assembly 6 further includes a first drive part 61, with connecting parts 611 at both ends of the first drive part 61, and connecting mating parts 83 for both the first grinding head 81 and the second grinding head 82. The connecting parts 611 and the connecting mating parts 83 cooperate to connect the first grinding head 81 and the first drive part 61, and the second grinding head 82 and the first drive part 61, respectively.

[0052] Specifically, the first drive unit 61 can be a dual-shaft motor or a dual-output-shaft motor. One end of the motor is connected to the first grinding head 81, and the other end is connected to the second grinding head 82. The connection part 611 and the connection mating part 83 are keyed, which can be in the form of a flexible coupling, such as a combination of a lamellar coupling and a lamellar key, or it can be in the form of a rigid coupling. The connection part 611 and the connection mating part 83 are tightly connected to achieve stable rotation of the first grinding head 81 and / or the second grinding head 82 driven by the first drive unit 61. To further fix the first drive unit 61 and the waterproof grinding head 01, the grinding drive assembly 6 also includes a fixing member 62. One end of the fixing member 62 is connected to the bearing seat 44 of the waterproof grinding head 01, and the other end is connected to the first drive unit 61.

[0053] Example 3 Combination Figure 5-8 As shown, this disclosure provides a grinding head mechanism, including a grinding head assembly as described in any of the above embodiments and a rotary drive assembly 5 for driving the grinding head assembly to rotate.

[0054] During operation, the rotary drive assembly 5 can drive the grinding drive assembly 6 in the grinding head assembly to rotate, enabling the first grinding head 81 and the second grinding head 82 at both ends of the grinding drive assembly 6 to move or switch positions, thereby improving processing efficiency.

[0055] like Figure 6As shown, the rotary drive assembly 5 further includes a second drive unit 51, a transmission unit 52, and a reducer 53. The second drive unit 51 can drive the transmission unit 52 to rotate. The transmission unit 52 is connected to the reducer 53. The grinding drive assembly 6 is connected to the reducer 53.

[0056] Specifically, the second drive unit 51 drives the transmission unit 52 to rotate, the transmission unit 52 drives the reducer 53 to rotate, the reducer 53 is provided with a mounting base plate, the grinding drive assembly 6 is mounted on the mounting base plate, and the reducer 53 drives the grinding drive assembly 6 mounted on the mounting base plate to rotate, thereby realizing the switching between the first grinding head 81 and the second grinding head 82.

[0057] Specifically, the second drive unit 51 can be a servo motor or a stepper motor, the transmission unit 52 can be a combination of a drive wheel, a belt and a driven wheel, or a combination of gears and chains, and the reducer 53 can be a harmonic reducer 53, a planetary reducer 53 or an RV reducer 53.

[0058] The setting of the reducer 53 will significantly reduce the high-speed input speed of the drive wheel and the output speed to the grinding drive assembly 6. While reducing the speed, the reducer 53 will amplify the input torque through its internal gear meshing structure, providing greater driving force to the grinding drive assembly 6. Moreover, by reducing speed and increasing torque, the reducer 53 reduces the load on the second drive unit 51 and extends its service life.

[0059] The present invention has been described above by way of example, but the present invention is not limited to the specific embodiments described above. Any modifications or variations made based on the present invention shall fall within the scope of protection claimed by the present invention.

Claims

1. A waterproof grinding head, characterized in that, It includes a central shaft, a shaft end cap, and a first end cap. The shaft end cap is sleeved around the central shaft and can rotate with the rotation of the central shaft. The first end cap is sleeved on the shaft end cap. The shaft end cap is provided with a waterproof part. The first end cap is provided with a waterproof mating part. The waterproof part and the waterproof mating part cooperate to form a labyrinth waterproof structure.

2. The waterproof grinding head according to claim 1, characterized in that, The waterproof part includes a main body and a first protrusion circumferentially disposed on the main body. The waterproof mating part includes a first groove and a second groove. The second groove is disposed at the bottom of the first groove. The main body is embedded in the first groove, and the first protrusion is embedded in the second groove.

3. The waterproof grinding head according to claim 2, characterized in that, The first protrusion includes a first segment and a second segment. The first segment is connected to the main body and extends along the axial direction of the central axis, and the second segment is connected to the first segment and extends radially away from the central axis.

4. The waterproof grinding head according to claim 2, characterized in that, The waterproof part also includes a second protrusion, which is circumferentially disposed on the side of the first protrusion near the central axis, and the groove wall of the second groove near the central axis is embedded between the first protrusion and the second protrusion.

5. The waterproof grinding head according to claim 2, characterized in that, The first protrusion and the sidewall of the second groove together form the first annular gap.

6. The waterproof grinding head according to any one of claims 1 to 5, characterized in that, The central shaft is provided with a first step limiting part in the circumferential direction. The end of the shaft end cap close to the central shaft abuts against the first step limiting part and abuts against the side wall of the central shaft to form an interference fit, so as to fix the shaft end cap to the central shaft.

7. The waterproof grinding head according to any one of claims 1 to 5, characterized in that, It also includes a first oil seal, which is circumferentially sleeved on the central shaft. The first end cap extends with a third protrusion in a direction close to the central shaft, and the first oil seal is disposed between the shaft end cap and the third protrusion.

8. The waterproof grinding head according to any one of claims 1 to 5, characterized in that, It also includes a first angular contact bearing and a second angular contact bearing, which are arranged back to back.

9. The waterproof grinding head according to any one of claims 1 to 5, characterized in that, It also includes a bearing housing, which is fitted onto the first angular contact bearing and the second angular contact bearing. The bearing housing is provided with a limiting hole, and the first end cover is provided with a through hole. The limiting hole and the through hole pass through a fixing member to fix the first end cover and the bearing housing.

10. A grinding head assembly, characterized in that, It includes a grinding drive assembly, a grinding element, and a waterproof grinding head as described in any one of claims 1 to 9, wherein the waterproof grinding head is disposed on the grinding drive assembly, and the grinding element is disposed on the waterproof grinding head.

11. The grinding head assembly according to claim 10, characterized in that, The number of waterproof grinding heads is multiple, including a first grinding head and a second grinding head, which are respectively disposed at both ends of the grinding drive assembly.

12. The grinding head assembly according to claim 11, characterized in that, The grinding drive assembly includes a first drive unit, with connecting parts at both ends of the first drive unit. The first grinding head and the second grinding head are each provided with a connecting mating part. The connecting parts and the connecting mating parts cooperate to connect the first grinding head and the first drive unit, as well as the second grinding head and the first drive unit, respectively.

13. A grinding head mechanism, characterized in that, It includes a grinding head assembly as described in any one of claims 10 to 12 and a rotary drive assembly for driving the grinding head assembly to rotate.

14. The grinding head mechanism according to claim 13, characterized in that, The rotary drive assembly includes a second drive unit, a transmission unit, and a reducer. The second drive unit can drive the transmission unit to rotate. The transmission unit is connected to the reducer. The grinding drive assembly is connected to the reducer.

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