Liquid-cooled molar device with novel rotary sealing structure

Abstract

The utility model discloses a liquid cooling molar device with a novel rotary sealing structure. The liquid-cooled tooth grinding device comprises a liquid-cooled grinding wheel, a liquid passing rotating shaft and two rotary sealing connectors, a cooling ring groove, a radial liquid inlet hole and a radial liquid outlet hole of the liquid cooling grinding wheel and an axial liquid inlet hole and an axial liquid outlet hole of the liquid passing rotating shaft form a liquid channel, and a threaded port of the liquid channel is connected with rotating connecting pipes of the two rotating sealing connectors. A driven wheel of the driving part is fixedly connected with the outer end of the peripheral wall of the liquid-passing rotating shaft; the outer end of a rotary cavity of a fixed shell of the rotary sealing connector is connected with a rotary connecting pipe through a bearing, the axial spring pressing end of the rotary sealing connector elastically fits the outer wall of the rotary connecting pipe towards a friction sleeve, and the outer end of the fixed cavity is in threaded connection with a liquid inlet pipe and a liquid return pipe of a liquid supply part. According to the utility model, a novel rotary sealing structure is adopted to realize a good internal circulation liquid cooling passage, the temperature can be quickly reduced, the device is suitable for high-temperature grinding scenes, and the product yield is high.

Description

Technical Field

[0001] This utility model relates to the field of machining equipment, and in particular to a liquid-cooled gear grinding device with a novel rotary sealing structure. Background Technology

[0002] Machine cutting tools are an important component of machining equipment. During the production of machine cutting tools (such as taps), the teeth need to be ground using a grinding machine. When the grinding wheel rotates and grinds the workpiece, the hard cutting between metals generates a large amount of heat. External cooling with coolant is typically used, especially in single-sided skip-tooth machining, where the grinding speed is further increased, requiring even more heat to be dissipated quickly. This necessitates a large amount of coolant for heat dissipation. However, this method has several drawbacks: First, a large amount of coolant sprayed onto the friction wheel can also enter the workpiece's grinding surface, making it difficult for the operator to observe the real-time working conditions and adjust the work process in a timely manner, thus affecting machining accuracy. Second, human error can easily damage the grinding wheel, increasing the probability of workpiece defects, reducing yield, and increasing product costs. Third, it requires a high-flow-rate spraying structure and a liquid recovery structure, resulting in a complex structure that increases the equipment size and cost. Utility Model Content

[0003] To address one or more of the aforementioned problems, this invention provides a liquid-cooled dental grinding device with a novel rotary sealing structure.

[0004] According to one aspect of the present invention, the liquid-cooled grinding device with a novel rotary sealing structure includes: a liquid-cooled grinding wheel, a liquid-conducting rotating shaft, a drive unit, and two rotary sealing connectors.

[0005] The transverse shaft hole of the liquid-cooled grinding wheel is fixed with a liquid-passing rotating shaft, and the cooling ring groove of the liquid-cooled grinding wheel is connected to the radial liquid inlet hole and the radial liquid outlet hole;

[0006] The inner ends of the axial inlet and axial outlet of the liquid-conducting shaft are connected to the radial inlet and radial outlet, and the threaded port at the outer end of the liquid-conducting shaft is connected to the rotary coupling of two rotary seal connectors.

[0007] The driven wheel of the drive unit is fixedly connected to the outer end of the peripheral wall of the fluid-conducting shaft;

[0008] The rotary sealing connector includes a fixed housing and a rotary coupling. The fixed housing includes a rotating cavity and a stationary cavity with vertically connected ends. The outer end of the rotating cavity is fixedly connected to the outer ring of a bearing, and a lateral friction sleeve is sleeved through the middle section with an axial spring installed at the end. The rotary coupling is fixedly connected to the inner ring of the bearing. The axial spring presses the lateral friction sleeve to elastically fit against the outer wall of the rotary coupling. The outer end of the stationary cavity is threadedly connected to the inlet pipe and return pipe of the liquid supply section, thereby forming a circulating liquid cooling passage.

[0009] In some embodiments, an annular groove is provided on the outer wall of the friction sleeve, and an annular protrusion is provided on the inner end face of the rotating connecting pipe, with the annular protrusion being equal in diameter to the annular groove of the sleeve.

[0010] In some implementations, the inner extension of the rotating coupling is aligned with the friction sleeve at the same diameter insertion end.

[0011] In some embodiments, the sealing ring of the rotary seal connector is fitted to the friction sleeve on one side and a flat gasket on the other side, with an axial spring fitted to the other side of the flat gasket.

[0012] In some embodiments, the endo-friction sleeve is made of rubber, and the endo-friction sleeve, sealing ring, and flat gasket are fitted in the friction section in the middle of the rotating cavity.

[0013] In some embodiments, a rubber cover is integrally injection molded to the middle of the rotating connecting pipe, with the inner end of the rubber cover fitting against the outer wall of the fixed housing.

[0014] In some embodiments, two bearings are installed side by side in the bearing hole at the left end of the rotating cavity, with a spacer between the two bearings. The inner ring of the outer bearing is positioned and fitted against the first shoulder of the rotating connecting pipe, and its outer ring is positioned and fitted against the retaining ring provided in the hole of the rotating cavity. The inner ring of the inner bearing is positioned and fitted against the shaft retaining ring provided in the rotating connecting pipe, and its outer ring is positioned and fitted against the second shoulder of the rotating cavity.

[0015] In some embodiments, the housing is detachably connected to the frame or the mounting plate of the frame via a thread; or the drive unit is a gear transmission system, with the inner end of the drive unit fixedly connected to the fixed frame.

[0016] Alternatively, the liquid supply unit may include a liquid storage tank equipped with a hydraulic pump, wherein the return port of the liquid storage tank is connected to a return pipe and the outlet of the hydraulic pump is connected to an inlet pipe.

[0017] In some embodiments, the liquid-cooled grinding wheel has at least one vertical annular cooling ring groove near the outer circumference of the outer wall. In the vertical section of each cooling ring groove, radial liquid inlet holes and radial liquid outlet holes are symmetrically arranged and located at both ends of the same diameter. The radial liquid inlet holes, radial liquid outlet holes and the semi-circular grooves at the left and right ends of the cooling ring groove form two parallel cooling channels. The inner ends of the axial liquid inlet holes and axial liquid outlet holes are provided with radial transition holes, and the outer ends of the two radial transition holes are respectively fitted and connected to the radial liquid inlet holes and the radial liquid outlet holes.

[0018] In some embodiments, the liquid-cooled grinding wheel includes a cylindrical wheel body with integrally symmetrical flanges at both ends. The outer peripheral wall of the wheel body is provided with a first single-sided grinding tooth and a second single-sided grinding tooth that are connected to each other. The first single-sided grinding tooth and the second single-sided grinding tooth achieve a single-sided grinding structure by reducing the angle between the suspended surface and the vertical surface or by raising the middle diameter. The axial distance between the two is at least twice the tooth pitch of the workpiece to be ground, so that the grinding start point of the left tooth is always earlier than that of the right tooth.

[0019] This liquid-cooled gear grinding device with a novel rotary seal structure forms a circulating liquid cooling path through a liquid-cooled grinding wheel, a liquid-conducting shaft, a rotary seal connector, and a liquid supply unit. This allows for rapid cooling and is suitable for high-temperature dry grinding scenarios. It can also be combined with a small amount of external coolant for further heat dissipation, effectively achieving rapid cooling. Its advantages are: First, the built-in circulating liquid cooling structure prevents large amounts of liquid from entering the processing area, facilitating operator observation and adjustment, achieving good processing accuracy, avoiding human error, protecting the processing equipment, and resulting in a high product yield and reduced overall product costs. Second, the structure is simple, requiring only changes to the grinding wheel and shaft structure without increasing the equipment size, effectively controlling costs. Third, the rotary seal connector is detachably mounted on the liquid-conducting shaft, making installation convenient and maintenance easy. Fourth, the rotary seal connector uses an elastic floating friction wheel pressing against the rotating coupling, achieving a good rotary seal, a long service life, and suitability for applications transitioning from rotary to fixed operation. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a liquid-cooled dental grinding device with a novel rotary sealing structure according to one embodiment of the present invention;

[0021] Figure 2 for Figure 1 A partially enlarged schematic diagram (I) of a liquid-cooled dental grinding device with a novel rotary sealing structure is shown.

[0022] Figure 3 for Figure 2 A schematic diagram of the rotary seal connector shown.

[0023] Figure 4 for Figure 1 Partial enlarged schematic diagram (II) of the liquid-cooled dental grinding device with a novel rotary sealing structure;

[0024] Figure 5 for Figure 4 A cross-sectional schematic diagram of the liquid-cooled grinding wheel shown;

[0025] Figure 6 for Figure 4 A partially enlarged schematic diagram of the liquid-cooled grinding wheel shown;

[0026] Liquid-cooled grinding wheel 1, wheel body 10, transverse shaft hole 101, cooling ring groove 102, radial liquid inlet hole 103, radial liquid outlet hole 104, flange 11, first single-sided grinding tooth 12, right grinding surface 120, left overhang surface 121, second single-sided grinding tooth 13, left grinding surface 130, right overhang surface 131, coarse grinding tooth 14;

[0027] Liquid-passing shaft 2, threaded port 20, axial liquid inlet hole 21, axial liquid outlet hole 22, radial transition hole 23;

[0028] Drive unit 3, driven wheel 31;

[0029] Rotary sealing connector 4, bearing 40, fixed housing 41, rotating cavity 410, fixed stationary cavity 411, friction section 412, bearing hole 413, second shoulder 414, rotary connecting pipe 42, rubber cover plate 420, annular protrusion 421, inner extension tube 422, first shaft shoulder 423, spacer 43, endoscopic friction sleeve 44, annular groove 441, axial spring 45, sealing ring 46, flat gasket 47, hole retaining ring 48, shaft retaining ring 49;

[0030] Liquid supply unit 5, liquid inlet pipe 51, liquid return pipe 52;

[0031] Rack 6;

[0032] Part 01 to be ground. Detailed Implementation

[0033] The present invention will now be described in further detail with reference to the accompanying drawings. It should be noted that the terms "front," "rear," "left," "right," "up," and "down" used in the following description refer to the directions in the accompanying drawings, while the terms "inner" and "outer" refer to the directions toward or away from the geometric center of a specific component, respectively.

[0034] Figures 1 to 6 The figure schematically illustrates a liquid-cooled grinding device with a novel rotary sealing structure according to one embodiment of the present invention. As shown, the liquid-cooled grinding device with the novel rotary sealing structure includes: a liquid-cooled grinding wheel 1, a liquid-conducting rotating shaft 2, a drive unit 3, and two rotary sealing connectors 4;

[0035] The transverse shaft hole 101 of the liquid-cooled grinding wheel 1 is fixed to the liquid-passing rotating shaft 2, and the cooling ring groove 102 of the liquid-cooled grinding wheel 1 is connected to the radial liquid inlet hole 103 and the radial liquid outlet hole 104.

[0036] The inner ends of the axial inlet hole 21 and axial outlet hole 22 of the liquid-conducting shaft 2 are connected to the radial inlet hole 103 and the radial outlet hole 104, and the threaded port 20 at the outer end of the liquid-conducting shaft 2 is connected to the rotary connecting pipe 42 of the two rotary sealing connectors 4.

[0037] The driven wheel 31 of the drive unit 3 is fixedly connected to the outer end of the peripheral wall of the liquid-conducting shaft 2;

[0038] The rotary sealing connector 4 includes a fixed housing 41 and a rotary connecting pipe 42. The fixed housing 41 includes a rotating cavity 410 and a stationary cavity 411 with vertically connected ends. The outer end of the rotating cavity 410 is fixedly connected to the outer ring of the bearing 40, and the middle section is fitted with an end friction sleeve 44 and an axial spring 45 is installed at the end. The rotary connecting pipe 42 is fixedly connected to the inner ring of the bearing 40. The axial spring 45 presses the end friction sleeve 44 to elastically fit the outer wall of the rotary connecting pipe 42. The outer end of the stationary cavity 411 is threadedly connected to the liquid supply section 5's inlet pipe 51 and return pipe 52, thereby forming a circulating liquid cooling passage by the liquid inlet pipe 51, the first spiral sealing connector 4, the axial liquid inlet hole 21, the radial liquid inlet hole 101, the cooling ring groove 102, the radial liquid outlet hole 102, the axial liquid outlet hole 22, the second spiral sealing connector 4, and the return pipe 52.

[0039] This liquid-cooled gear grinding device with a novel rotary seal structure forms a circulating liquid cooling path through a liquid-cooled grinding wheel 1, a liquid-conducting rotating shaft 2, a rotary seal connector 4, and a liquid supply unit 5. This allows for rapid cooling and is suitable for high-temperature dry grinding scenarios. It can also be combined with a small amount of external coolant for heat dissipation, effectively achieving rapid cooling. Its advantages are: First, the built-in circulating liquid cooling structure prevents large amounts of liquid from entering the processing area, facilitating operator observation and adjustment, achieving good processing accuracy, avoiding human error, protecting the processing equipment, and resulting in a high product yield and reduced overall product costs. Second, the structure is simple; only the grinding wheel and rotating shaft structures need to be modified, without increasing the equipment size, effectively controlling costs. Third, the rotary seal connector 4 is detachably mounted on the liquid-conducting rotating shaft 2, making installation convenient and maintenance easy. Fourth, the rotary seal connector 4 uses an elastic floating friction wheel pressing against the rotary connecting pipe 42, achieving a good rotary seal, long service life, and suitability for applications transitioning from rotary to fixed operation.

[0040] Furthermore, an annular groove 441 is provided on the outer wall of the end friction sleeve 44, and an annular protrusion 421 is provided on the inner end face of the rotating connecting pipe 42. The annular protrusion 421 is fitted into the annular groove 441 with the same diameter. Preferably, a plurality of annular grooves 441 are concentrically arranged on the outer wall of the end friction sleeve 44, and a plurality of annular protrusions 421 are concentrically arranged on the inner end face of the rotating connecting pipe 42. The beneficial effect is that the cooperation between the annular groove 441 and the annular protrusion 421 further improves the end face sealing performance and positioning performance.

[0041] Preferably, the rotary coupling 42 is further provided with an inner extension tube 422, which is inserted into the end friction sleeve 44 with the same diameter. The beneficial effect is that the inner extension tube 422 can prevent liquid from overflowing.

[0042] Furthermore, the sealing ring 46 of the rotary sealing connector 4 is fitted with the endo-friction sleeve 44 on one side and a flat gasket 47 on the other side, with an axial spring 45 fitted on the other side of the flat gasket 47. Preferably, the endo-friction sleeve 44 is made of rubber, and a friction section 412 is provided in the middle of the rotating cavity 410. The endo-friction sleeve 44, the sealing ring 46, and the flat gasket 47 are fitted onto the friction section 412. The beneficial effects are: the sealing ring 46 further improves radial sealing, while the flat gasket effectively protects the sealing ring 46 and improves its service life.

[0043] Furthermore, a rubber cover plate 420 is integrally injection molded into the middle of the rotating connecting pipe 42, with the inner end of the rubber cover plate 420 fitting against the outer wall of the fixed housing 41. Its beneficial effect is that the rubber cover plate 420 has good elastic sealing performance, preventing liquid spillage and the entry of other impurities.

[0044] Furthermore, two bearings 40 are installed side-by-side in the bearing hole 413 at the left end of the rotating cavity 410, with a spacer 43 between them. The inner ring of the outer bearing 40 is positioned against the first shoulder 423 of the rotating connecting pipe 42, and its outer ring is positioned against the retaining ring 48. The retaining ring 48 is located in the outer groove of the rotating cavity 410. The inner ring of the inner bearing 40 is positioned against the shaft retaining ring 49, and its outer ring is positioned against the second shoulder 414 of the rotating cavity 410. The shaft retaining ring 49 is located in the inner groove of the rotating connecting pipe 42. The beneficial effect is that this arrangement has good rotational performance and achieves a better rotary sealing function.

[0045] Furthermore, the fixed housing 41 is detachably connected to the frame 6 or the connecting plate of the frame 6 by thread. Its advantages are: the structure is simple and the stability is good.

[0046] Furthermore, the drive unit 3 is a gear transmission system, and the inner end of the drive unit 3 is fixedly connected to the fixed frame 6; its beneficial effect is that this setting can achieve high-precision rotational power.

[0047] Furthermore, the liquid supply unit 5 includes a liquid storage tank equipped with a hydraulic pump. The return port of the liquid storage tank is connected to the return pipe 52, and the outlet of the hydraulic pump is connected to the inlet pipe 51. Its advantage is that this arrangement enables excellent liquid circulation cooling.

[0048] Furthermore, the liquid-cooled grinding wheel 1 has at least one vertical annular cooling ring groove 102 near its outer circumference. Within the vertical section of each cooling ring groove 102, the liquid-cooled grinding wheel 1 is symmetrically provided with radial inlet holes 103 and radial outlet holes 104, with the radial inlet holes 103 and radial outlet holes 104 located on the same diameter. The radial inlet holes 103, radial outlet holes 104, and the semi-circular grooves at the left and right ends of the cooling ring groove 102 form two parallel cooling channels. Radial transition holes 23 are provided at the inner ends of both the axial inlet holes 21 and axial outlet holes 22, and the outer ends of the two radial transition holes 23 are respectively fitted and connected to the radial inlet holes 103 and radial outlet holes 104. Preferably, a sealing element is also provided between the radial transition holes 23 and the radial inlet holes 103 and radial outlet holes 104 for end-to-end sealing. The beneficial effect is that this arrangement can uniformly dissipate heat from the liquid-cooled grinding wheel 1, resulting in a more uniform overall temperature and higher machining accuracy.

[0049] Furthermore, the liquid-cooled grinding wheel 1 includes a cylindrical wheel body 10. The wheel body 10 has integrally symmetrical flanges 11 at both ends. The two flanges 11 preferably have cooling ring grooves 102. The outer peripheral wall of the wheel body 10 has a first single-sided grinding tooth 12 and a second single-sided grinding tooth 13 that are connected to each other. The first single-sided grinding tooth 12 and the second single-sided grinding tooth 13 achieve a single-sided grinding structure by reducing the angle between the suspended surface and the vertical surface or by raising the middle diameter. The axial distance between the two is at least twice the tooth pitch of the workpiece 01 to be ground, so that the grinding start point of the left tooth is always earlier than that of the right tooth.

[0050] Preferred, such as Figure 6 As shown, the left overhanging surface 121 of the first single-sided grinding tooth 12 and the right overhanging surface 131 of the second single-sided grinding tooth 13 do not contact the workpiece 01 to be ground. The right grinding surface 120 of the first single-sided grinding tooth 12 and the left grinding surface 130 of the second single-sided grinding tooth 13 are integrally connected. The axial distance between the two is at least twice the tooth pitch of the workpiece 01 to be ground. The right grinding surface 120 processes the left tooth ridge of the front tooth of the workpiece 01 to be ground, and the left grinding surface 130 skips at least one tooth to process the right tooth ridge of the back tooth of the workpiece 01 to be ground, so that the grinding start point of the left tooth ridge is always earlier than that of the right tooth ridge. Its beneficial effects are as follows: First, the first single-sided grinding teeth 12 and the second single-sided grinding teeth 13 are independent of each other and have no fixed pitch, which can grind workpieces 01 with various pitches, making it highly versatile. Moreover, the two grinding teeth can be processed simultaneously, resulting in high grinding efficiency. Second, the skip-tooth processing function of the first single-sided grinding teeth 12 and the second single-sided grinding teeth 13 ensures that the grinding start point of the left tooth is always earlier than that of the right tooth. Within a certain width, it can process the left tooth of the workpiece 01 to have a cylindrical cutting edge, while the right tooth does not. The workpiece 01 can withstand higher cutting loads, greatly improving its service life. It is not only suitable for ordinary processing but also for special tool processing, thus expanding its application range.

[0051] Preferably, the first single-sided grinding tooth 12 and the second single-sided grinding tooth 13 achieve a single-sided grinding structure by reducing the angle between the suspended surface and the vertical surface or by raising the middle diameter.

[0052] The method for reducing the angle between the suspended surface and the vertical surface is as follows: the angle between the right grinding surface 120 and the vertical surface of the first single-sided grinding tooth 12 is equal to the half angle of the tooth profile of the workpiece 01 to be ground, and the angle between the left suspended surface 121 and the vertical surface is less than the half angle of the tooth profile of the workpiece 01 to be ground, thus forming a single-sided grinding tooth with right tooth surface grinding and left tooth surface suspended; the angle between the left grinding surface 130 and the vertical surface of the second single-sided grinding tooth 13 is equal to the half angle of the tooth profile of the workpiece 01 to be ground, and the angle between the right suspended surface 131 and the vertical surface is less than the half angle of the tooth profile of the workpiece 01 to be ground, thus forming a single-sided grinding tooth with left tooth surface grinding and right tooth surface suspended.

[0053] The raised middle diameter mode is as follows: the middle diameter of the first single-sided grinding tooth 12 and the second single-sided grinding tooth 13 is higher than the tooth profile middle diameter of the workpiece 01 to be ground, thus forming a single-sided grinding tooth with one side in contact and the other side suspended.

[0054] Preferably, the left end of the first single-sided grinding tooth 12 is also provided with several coarse grinding teeth 14. The beneficial effect is that by setting coarse grinding teeth 14, a larger grinding depth can be used to quickly remove most of the excess material on the surface of the part. Fine grinding uses a very small grinding depth to ensure the micro-processing and high smoothness of the surface of the part. The grinding wheel can complete the dressing work of the workpiece 01 to be ground in one go, ensuring both processing speed and grinding accuracy.

[0055] Preferably, the grinding wheel 1 is a grinding roller or a grinding wheel; the workpiece to be ground 01 is a spiral tap. Its advantages are: this selection provides excellent grinding function and a wide range of applications.

[0056] The above descriptions are merely some embodiments of this utility model. For those skilled in the art, various modifications and improvements can be made without departing from the inventive concept of this utility model, and all such modifications and improvements fall within the protection scope of this utility model.

Claims

1. A liquid-cooled dental grinding device with a novel rotary sealing structure, characterized in that, include: Liquid-cooled grinding wheel (1), liquid-cooled rotating shaft (2), drive unit (3), and two rotary sealing connectors (4); The transverse shaft hole (101) of the liquid-cooled grinding wheel (1) is fixed to the liquid-passing rotating shaft (2), and the cooling ring groove (102) of the liquid-cooled grinding wheel (1) is connected to the radial liquid inlet hole (103) and the radial liquid outlet hole (104). The inner ends of the axial inlet hole (21) and axial outlet hole (22) of the liquid-conducting shaft (2) are connected to the radial inlet hole (103) and radial outlet hole (104), and the threaded port (20) at the outer end of the liquid-conducting shaft (2) is connected to the rotary connecting pipe (42) of two rotary sealing connectors (4). The passive wheel (31) of the drive unit (3) is fixedly connected to the outer end of the peripheral wall of the liquid-conducting shaft (2); The rotary sealing connector (4) includes a fixed housing (41) and a rotary connecting pipe (42). The fixed housing (41) includes a rotating cavity (410) and a stationary cavity (411) with the ends vertically connected. The outer end of the rotating cavity (410) is fixedly connected to the outer ring of the bearing (40), the middle section is fitted with an end friction sleeve (44), and an axial spring (45) is installed at the end. The rotary connecting pipe (42) is fixedly connected to the inner ring of the bearing (40). The axial spring (45) presses the end friction sleeve (44) to elastically fit the outer wall of the rotary connecting pipe (42). The outer end of the stationary cavity (411) is threadedly connected to the inlet pipe (51) and return pipe (52) of the liquid supply section (5), thereby forming a circulating liquid cooling passage.

2. The liquid-cooled dental grinding device with a novel rotary sealing structure according to claim 1, characterized in that, The outer wall of the end friction sleeve (44) is provided with an annular groove (441), and the inner end face of the rotating connecting pipe (42) is provided with an annular protrusion (421). The annular protrusion (421) is equal in diameter to the annular groove (441) of the sleeve.

3. The liquid-cooled dental grinding device with a novel rotary sealing structure according to claim 2, characterized in that, The inner extension tube (422) of the rotating connector (42) is inserted into the friction sleeve (44) at the same diameter end.

4. The liquid-cooled dental grinding device with a novel rotary sealing structure according to claim 1, characterized in that, The sealing ring (46) of the rotary sealing connector (4) is attached to the end friction sleeve (44) on one side and to a flat gasket (47) on the other side, and to an axial spring (45) on the other side of the flat gasket (47).

5. The liquid-cooled dental grinding device with a novel rotary sealing structure according to claim 4, characterized in that, The end friction sleeve (44) is made of rubber. The end friction sleeve (44), the sealing ring (46) and the flat gasket (47) are sleeved on the friction section (412) in the middle of the rotating cavity (410).

6. The liquid-cooled dental grinding device with a novel rotary sealing structure according to any one of claims 1 to 5, characterized in that, The rotating connecting pipe (42) is also integrally injection molded with a rubber cover plate (420), the inner end of which is attached to the outer wall of the fixed shell (41).

7. The liquid-cooled dental grinding device with a novel rotary sealing structure according to any one of claims 1 to 5, characterized in that, Two bearings (40) are installed side by side in the bearing hole (413) at the left end of the rotating cavity (410). There is a spacer (43) between the two bearings (40). The inner ring of the outer bearing (40) is positioned and fitted with the first shoulder (423) of the rotating connecting pipe (42), and its outer ring is positioned and fitted with the retaining ring (48) provided in the hole of the rotating cavity (410). The inner ring of the inner bearing (40) is positioned and fitted with the shaft retaining ring (49) provided in the rotating connecting pipe (42), and its outer ring is positioned and fitted with the second shoulder (414) of the rotating cavity (410).

8. The liquid-cooled dental grinding device with a novel rotary sealing structure according to any one of claims 1 to 5, characterized in that, The fixed housing (41) is detachably connected to the frame (6) or the connecting plate of the frame (6) by a thread; or the drive unit (3) is a gear transmission system, and the inner end of the drive unit (3) is fixedly connected to the fixed frame (6); The liquid supply unit (5) includes a liquid storage tank equipped with a hydraulic pump, the return port of the liquid storage tank is connected to the return pipe (52) and the outlet of the hydraulic pump is connected to the inlet pipe (51).

9. The liquid-cooled dental grinding device with a novel rotary sealing structure according to any one of claims 1 to 5, characterized in that, The liquid-cooled grinding wheel (1) has at least one vertical annular cooling ring groove (102) near the outer wall of the circumference. In the vertical section of each cooling ring groove (102), radial liquid inlet holes (103) and radial liquid outlet holes (104) are symmetrically arranged and located at both ends of the same diameter. The radial liquid inlet holes (103), radial liquid outlet holes (104) and the semi-circular grooves at the left and right ends of the cooling ring groove (102) form two parallel cooling channels. The inner ends of the axial liquid inlet holes (21) and axial liquid outlet holes (22) are provided with radial transition holes (23). The outer ends of the two radial transition holes (23) are respectively attached to and connected to the radial liquid inlet holes (103) and radial liquid outlet holes (104).

10. The liquid-cooled dental grinding device with a novel rotary sealing structure according to claim 9, characterized in that, The liquid-cooled grinding wheel (1) includes a cylindrical wheel body (10). The wheel body (10) has flanges (11) integrally and symmetrically provided at both ends. The outer peripheral wall of the wheel body (10) is provided with a first single-sided grinding tooth (12) and a second single-sided grinding tooth (13) that are connected to each other. The first single-sided grinding tooth (12) and the second single-sided grinding tooth (13) achieve a single-sided grinding structure by reducing the angle between the suspended surface and the vertical surface or by raising the middle diameter. The axial distance between the two is at least twice the tooth pitch of the workpiece (01) to be ground, so that the grinding start point of the left tooth is always earlier than that of the right tooth.

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