High concentricity gear quick clamping positioning grinding machine

Abstract

The application discloses a high-concentricity gear quick clamping positioning grinding machine, and relates to the technical field of grinding machine, which comprises a machine body, a clamping mechanism is arranged on the machine body, the clamping mechanism comprises a mandrel, an even number of oil cavities are arranged in the mandrel in a circumferential equidistant manner, a motor one is fixedly installed in the machine body, a pressurizing expansion assembly is arranged on the top of the mandrel, a conveying assembly is arranged in the mandrel, the conveying assembly comprises a motor two which is fixedly installed in the machine body, an internal pipe is movably connected to the mandrel, and the internal pipe is movably connected to the mandrel. In the process of rotating and grinding the thin-wall gear, the application drives the spiral blade to rotate and moves axially in a small range, so that the hydraulic oil in each oil cavity in the mandrel forms circulating flow and is fully mixed, the oil temperature of each oil cavity in the mandrel is balanced, the technical problem that the mandrel is asymmetrically expanded due to uneven heating when the gear rotates and grinds and the concentricity of the gear is reduced is fundamentally solved, and the grinding machining precision of the gear is significantly improved.

Description

Technical Field

[0001] This invention relates to the field of grinding machine tool technology, and in particular to a high concentricity gear quick clamping and positioning grinding machine tool. Background Technology

[0002] Grinding machine tools are machine tools that use high-speed rotating grinding wheels or other abrasives to cut the surface of workpieces to obtain high-precision dimensions, good surface roughness, and specific shapes. They are widely used in machinery manufacturing, automotive industry, aerospace and other fields, and play a key role, especially in the final processing of precision parts.

[0003] Gear manufacturing typically relies on grinding machines because gears, as core components in mechanical transmission, have parameters such as tooth profile accuracy, tooth direction accuracy, and cumulative pitch error that directly affect transmission efficiency, operational stability, and service life. Grinding can precisely control the relative movement between the grinding wheel and the workpiece to perform high-precision finishing on key parts of the gear, such as the tooth surface and reference surface, effectively eliminating errors generated in the previous processing and thus meeting the requirements for gear use under high load and high speed conditions.

[0004] In existing gear grinding processes, hydraulic expansion mandrels serve as key positioning fixtures. They are driven by hydraulic pressure to expand radially, enabling rapid clamping and self-centering of the gear's inner bore. However, during thin-walled gear grinding, the localized high heat generated in the grinding area is easily conducted along the gear body to the interface with the mandrel, resulting in uneven hydraulic oil temperature around the mandrel. This causes asymmetrical expansion of the mandrel, disrupting the coaxiality of the clamping system and ultimately reducing the concentricity of the gear, severely affecting the grinding accuracy of thin-walled gears. Summary of the Invention

[0005] The purpose of this invention is to solve the problem that when existing grinding machines process thin-walled gears, the local high heat generated in the grinding area is conducted along the gear body to the contact interface between the gear and the mandrel, resulting in uneven temperature of the hydraulic oil around the mandrel, causing asymmetric expansion of the mandrel and reducing the concentricity of the gear. The invention proposes a high-concentricity gear quick clamping and positioning grinding machine.

[0006] To achieve the above objectives, the present invention employs the following technology for a high concentricity gear quick clamping and positioning grinding machine tool: comprising a machine body, wherein a clamping mechanism is provided on the machine body, the clamping mechanism includes a spindle, wherein an even number of oil chambers are arranged circumferentially at equal intervals inside the spindle, a motor is fixedly installed inside the machine body, and a pressure expansion assembly is provided on the top of the spindle;

[0007] The mandrel is equipped with a conveying assembly, which includes a motor two fixedly installed inside the machine body. The mandrel is movably connected to an internal tube, and the internal tube is equipped with a rotating shaft with helical blades fixed on the rotating shaft.

[0008] It also includes an expansion balancing mechanism;

[0009] When the gear is rotating and grinding, the rotation of the helical blades causes the hydraulic oil in all the oil chambers to mix and circulate; when the gear is being ground on one side, the rotation of the helical blades causes the hydraulic oil in the oil chamber near the grinding side and its corresponding oil chamber to mix and circulate.

[0010] As a further description of the above technical solution: a magnetic coupler is provided between the rotating shaft and the second motor, the magnetic coupler including a magnetic rotor one and a magnetic rotor two fixed to the bottom end of the rotating shaft and the top end of the drive shaft of the second motor, respectively.

[0011] As a further description of the above technical solution: the expansion balancing mechanism includes two sealing rings respectively fixed to the top of the inner tube and the outside of the inner tube, a magnetic ring is fixed to the outside of the magnetic rotor, and an electromagnet is fixedly installed inside the body.

[0012] As a further description of the above technical solution: the expansion balancing mechanism also includes an adjustment component, the adjustment component includes a housing fixed to the inner wall of the built-in tube, a friction ring fixed to the outside of the rotating shaft, a shim rotatably connected to the bottom of the housing, and a spring fixed between the shim and the magnetic rotor.

[0013] As a further description of the above technical solution: the radial thickness of the helical blade is reduced.

[0014] As a further description of the above technical solution: the pressurization expansion assembly includes an extension tube fixed to the top of the mandrel, a piston is slidably connected inside the extension tube, and a threaded post is threadedly connected to the top of the extension tube.

[0015] As a further description of the above technical solution: it also includes a cooling mechanism, which includes a cooling pipe rotatably connected to the outside of the connecting pipe, and a pump with a water outlet connected to the cooling pipe is installed inside the machine body.

[0016] As a further description of the above technical solution: the bottom of the spindle is fixed with a connecting pipe that is rotatably connected to the machine body, and a transmission unit is connected between the motor and the connecting pipe.

[0017] In summary, due to the adoption of the above-mentioned technology for high concentricity gear rapid clamping and positioning grinding machine tools, the beneficial effects of this invention are:

[0018] 1. In the rotary grinding process of thin-walled gears, this application drives the spiral blades to rotate and coordinates with a small axial movement, which causes the hydraulic oil in each oil cavity inside the mandrel to form a circulating flow and achieve full mixing. This design can balance the oil temperature in each oil cavity inside the mandrel, fundamentally solving the technical problem that the mandrel causes asymmetric expansion due to uneven heating during gear rotary grinding, resulting in a decrease in gear concentricity, and thus significantly improving the gear grinding accuracy.

[0019] 2. For single-sided grinding of thin-walled gears, this application seals the remaining oil chambers with a sealing ring, leaving only the oil chamber near the grinding side and its corresponding oil chamber connected. Then, the hydraulic oil in the two chambers is driven to circulate and mix thoroughly by a spiral blade. This design can dynamically adapt to real-time processing conditions, making the temperature distribution of the mixed hydraulic oil more uniform. At the same time, by ensuring that the oil temperature of the symmetrical oil chambers inside the mandrel is consistent, the mandrel can be guided to expand symmetrically, effectively ensuring the concentricity of the gear during the processing and significantly improving the processing accuracy of single-sided grinding of thin-walled gears.

[0020] 3. In the rotary grinding and single-sided grinding of thin-walled gears, this application achieves precise control of the hydraulic oil flow direction by adjusting the rotation direction of the helical blades, thereby flexibly switching the order of hydraulic oil mixing and cooling to adapt to the temperature control requirements of different processing scenarios. The core advantage of this design is that it achieves dynamic matching between temperature control logic and processing conditions: in single-sided grinding, it focuses on local rapid temperature control and symmetrical balance; in rotary grinding, it focuses on overall uniform cooling and system stability, thereby effectively reducing the expansion deviation of the mandrel caused by temperature fluctuations and significantly improving the processing qualification rate of thin-walled gears in complex grinding scenarios. Attached Figure Description

[0021] Figure 1 An overall schematic diagram provided according to an embodiment of the present invention is shown;

[0022] Figure 2 A schematic diagram of the connecting pipe installation according to an embodiment of the present invention is shown;

[0023] Figure 3 A schematic cross-sectional view of a mandrel provided according to an embodiment of the present invention is shown;

[0024] Figure 4 The present invention provides an embodiment of the invention. Figure 3 Enlarged view of point A in the middle;

[0025] Figure 5 A schematic cross-sectional view of a connecting pipe provided according to an embodiment of the present invention is shown;

[0026] Figure 6 The present invention provides an embodiment of the invention. Figure 5 Enlarged view at point B in the middle;

[0027] Figure 7 A schematic cross-sectional view of the built-in tube provided according to an embodiment of the present invention is shown;

[0028] Figure 8 A schematic diagram of Mode 1 provided according to an embodiment of the present invention is shown;

[0029] Figure 9 A schematic diagram of Mode 2 provided according to an embodiment of the present invention is shown.

[0030] Legend:

[0031] 10. Organism;

[0032] 20. Clamping mechanism; 21. Mandrel; 22. Connecting pipe; 23. Motor 1; 24. Transmission unit; 25. Pressurization and expansion assembly; 251. Extension pipe; 252. Piston; 253. Threaded column; 26. Conveying assembly; 261. Motor 2; 262. Internal pipe; 263. Rotating shaft; 264. Helical blade; 27. Magnetic coupler; 271. Magnetic rotor 1; 272. Magnetic rotor 2;

[0033] 30. Expansion balancing mechanism; 31. Sealing ring; 32. Magnetic ring; 33. Electromagnet; 34. Adjusting component; 341. Housing; 342. Friction ring; 343. Gasket; 344. Spring;

[0034] 41. Cooling pipe; 42. Pump. Detailed Implementation

[0035] The high concentricity gear rapid clamping and positioning grinding machine tool of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0036] like Figures 1-9 As shown, the high concentricity gear quick clamping and positioning grinding machine tool provided by the present invention includes a machine body 10, and a clamping mechanism 20 for quick clamping and positioning of gears is provided on the machine body 10. The clamping mechanism 20 includes a spindle 21, and an even number of oil chambers arranged circumferentially and equally spaced inside the spindle 21. A main chamber is provided in the middle of the spindle 21, and both ends of each oil chamber are connected to the main chamber. A connecting pipe 22 rotatably connected to the machine body 10 is fixed at the bottom of the spindle 21.

[0037] The top of the mandrel 21 is provided with a pressure expansion assembly 25. The pressure expansion assembly 25 includes an extension tube 251 fixed to the top of the mandrel 21 and communicating with the main chamber. The main chamber, the interior of the connecting tube 22, the interior of the extension tube 251 and each oil chamber are filled with hydraulic oil. A piston 252 is slidably connected inside the extension tube 251, and a threaded post 253 is threadedly connected to the top of the extension tube 251.

[0038] After the thin-walled gear is fitted onto the mandrel 21, the threaded column 253 is rotated to press down the piston 252 to squeeze the hydraulic oil, which increases the oil pressure in each oil chamber inside the mandrel 21. The outer wall of the mandrel 21 expands and deforms, quickly clamping and positioning the inner wall of the gear.

[0039] Reference Figure 2 A motor 23 is fixedly installed inside the body 10. A transmission unit 24 is connected between the drive shaft of the motor 23 and the connecting pipe 22. The transmission unit 24 includes two turntables and a belt. The two turntables are fixed to the drive shaft of the motor 23 and the connecting pipe 22, respectively. After the gear is expanded and clamped by the spindle 21, the motor 23 is started to drive the turntable fixed to its drive shaft to rotate. The turntable drives the other turntable and the connecting pipe 22 to rotate under the transmission of the belt, thereby driving the spindle 21 and the gear to rotate, and grinding the outer wall of the gear.

[0040] Reference Figure 3 , Figure 4 and Figure 5 To address the issue that during the grinding process of thin-walled gears, the heat generated during grinding is conducted through the gear body to the contact interface with the mandrel 21, causing uneven hydraulic oil temperature in each oil chamber of the mandrel 21 and resulting in uneven expansion of the mandrel 21 and reduced gear concentricity, a conveying assembly 26 is provided inside the mandrel 21. The conveying assembly 26 includes a motor 261 fixedly installed inside the machine body 10. An internal tube 262 is movably connected inside the main chamber of the mandrel 21. A rotating shaft 263 is provided inside the internal tube 262, and a spiral blade 264 is fixed on the rotating shaft 263.

[0041] When the starting motor 261 drives the rotating shaft 263 and the helical blade 264 to rotate, the helical blade 264 can transport the hydraulic oil inside the main chamber of the mandrel 21 upward or downward, so that the hydraulic oil in each oil chamber circulates between the oil chamber and the main chamber. When the hydraulic oil in each oil chamber flows into the main chamber and is transported by the helical blade 264, it will mix with each other, so that it can maintain a consistent temperature after being sent back to the oil chamber, thereby ensuring that the mandrel 21 can expand evenly and improving the concentricity during gear grinding.

[0042] Reference Figure 5A magnetic coupler 27 is provided between the rotating shaft 263 and the second motor 261. The magnetic coupler 27 includes a magnetic rotor 271 and a magnetic rotor 272, which are respectively fixed to the bottom end of the rotating shaft 263 and the top end of the drive shaft of the second motor 261. The rotation of the drive shaft of the second motor 261 drives the magnetic rotor 272 to rotate, which in turn drives the magnetic rotor 271 to rotate through magnetic force. The magnetic rotor 271 then drives the rotating shaft 263 to rotate. Non-contact transmission is achieved through the magnetic coupler 27, which allows the connecting pipe 22 to seal and isolate the inside of the spindle 21, preventing the hydraulic oil from leaking due to increased internal pressure in the spindle 21.

[0043] Reference Figure 4 , Figure 5 and Figure 7 Considering that during the single-sided grinding of thin-walled gears, the overall circulation of hydraulic oil in each oil cavity not only wastes energy but also reduces the mixing and heat exchange effect between hydraulic oils in different oil cavities, an expansion balancing mechanism 30 is provided inside the mandrel 21. The expansion balancing mechanism 30 includes two sealing rings 31 fixed to the top of the inner tube 262 and the outside of the inner tube 262, respectively. The sealing rings 31 have two symmetrical notches. The two sealing rings 31 can seal the oil cavities except for the oil cavity near the grinding side and its corresponding oil cavity. At this time, the rotation of the helical blade 264 can only circulate the hydraulic oil between the above two oil cavities and the main chamber, so that the temperature distribution of the mixed hydraulic oil is more uniform. At the same time, by making the oil temperature of the symmetrical oil cavities inside the mandrel 21 consistent, the mandrel 21 can be guided to produce symmetrical expansion, effectively ensuring the concentricity during the gear processing.

[0044] A magnetic ring 32 is fixed to the outside of the magnetic rotor 271, and an electromagnet 33 is fixedly installed inside the body 10. The expansion balance mechanism 30 also includes an adjustment component 34. The adjustment component 34 includes a housing 341 fixed to the inner wall of the built-in tube 262. A friction ring 342 is fixed to the outside of the rotating shaft 263. The top surface of the friction ring 342 is a friction surface, and the bottom surface is smooth. A shim 343 is rotatably connected to the bottom of the housing 341. A spring 344 is fixed between the shim 343 and the magnetic rotor 271. The spring 344 is always in a compressed state.

[0045] When the electromagnet 33 is activated, it generates a magnetic repulsive force that pushes the magnetic ring 32 upward, causing the magnetic rotor 271, shaft 263, spring 344, outer shell 341, inner tube 262 and sealing ring 31 to move upward. After the sealing ring 31 seals the excess oil cavity of the spindle 21, the sealing ring 31 can no longer move upward.

[0046] The magnetic rotor 271, shaft 263, and friction ring 342 continue to move upward until the top surface of friction ring 342 contacts the top wall of housing 341. Then, the magnetic repulsion of electromagnet 33 is further strengthened, increasing the squeezing pressure between the top surface of friction ring 342 and the top wall of housing 341. At this time, the shaft 263 and friction ring 342 are driven to rotate by starting motor 261. The friction force can drive housing 341, internal tube 262, and sealing ring 31 to rotate, switching the oil chamber sealed by sealing ring 31. This allows the hydraulic oil circulation chamber to be adjusted according to the grinding position of the gear, improving the applicability of the device.

[0047] When the rotating shaft 263 and the spiral blade 264 rotate to transport hydraulic oil, the spiral blade 264 can move up and down reciprocally by periodically changing the magnitude of the magnetic repulsion force of the electromagnet 33, so that the hydraulic oil forms a circulating convection and promotes the full mixing of the hydraulic oil.

[0048] To further improve the mixing effect of the helical blade 264 on hydraulic oil, the radial thickness of the helical blade 264 is reduced, so that the hydraulic oil inside the helical blade 264 flows radially when the helical blade 264 reciprocates up and down. A stirring rod is fixed on the rotating shaft 263 to improve the uniformity of hydraulic oil mixing during rotation.

[0049] Reference Figure 2 and Figure 5 In order to prevent the hydraulic oil from heating up continuously during grinding, a cooling mechanism is also provided. The cooling mechanism includes a cooling pipe 41 rotatably connected to the outside of the connecting pipe 22. A pump 42 with a water outlet connected to the cooling pipe 41 is installed inside the machine body 10. By starting the pump 42, the cooling medium can be delivered through the cooling pipe 41 to cool the hydraulic oil flowing through the connecting pipe 22 and control the temperature of the hydraulic oil.

[0050] Reference Figure 8 and Figure 9 In the rotary grinding and single-sided grinding of thin-walled gears, the direction of hydraulic oil flow is precisely controlled by adjusting the rotation direction of the helical blades 264, thereby flexibly switching the order of hydraulic oil mixing and cooling to adapt to the temperature control requirements of different processing scenarios.

[0051] like Figure 9 As shown, in the partitioned circulation scenario of single-sided gear grinding, the hydraulic oil in the oil chamber flows downward through the connecting pipe 22. The system prioritizes cooling this part of the hydraulic oil through the cooling mechanism, and then drives it to mix with the low-temperature oil in the aligning oil chamber through the spiral blade 264. This process can quickly suppress the local high temperature on the grinding side and ensure that the oil temperature in the symmetrical oil chamber is uniform, fundamentally eliminating the symmetrical expansion deviation caused by temperature difference.

[0052] like Figure 8As shown, for the full-range circulation scenario of gear rotation grinding, the hydraulic oil in the oil chamber flows upward and merges into the main chamber. The system first drives the hydraulic oil in all oil chambers to be fully mixed through the spiral blade 264, and then uses the cooling mechanism for unified cooling. This mode can ensure that the temperature of all oil chambers is completely uniform after cooling, effectively avoiding the problem of asymmetric expansion of the mandrel 21 caused by insufficient local cooling, and ensuring the concentricity accuracy during full-range gear grinding.

[0053] The core advantage of this design lies in achieving dynamic matching between temperature control logic and machining conditions: during single-sided grinding, the focus is on "local rapid temperature control and symmetrical balance", while during full-area grinding, the emphasis is on "overall uniform cooling and system stability". Both modes form a closed loop through the directional adjustment of the spiral blade 264 and the on / off control of the oil chamber. Ultimately, while ensuring the hydraulic oil mixing efficiency, the expansion deviation of the spindle 21 caused by temperature fluctuations is controlled, significantly improving the machining pass rate of thin-walled gears in complex grinding scenarios.

[0054] It is worth mentioning that the sequential switching between mixing and cooling does not require an additional power unit, but can be achieved simply by adjusting the direction of the spiral blades 264, which simplifies the system structure and reduces energy consumption, making it suitable for continuous operation requirements in mass production.

[0055] Working principle: The thin-walled gear is sleeved on the mandrel 21. Then, the threaded column 253 is manually turned with the help of tools, which drives the piston 252 to move downward and squeeze the hydraulic oil, which increases the internal pressure of the mandrel 21. The increased pressure in the oil chamber of the mandrel 21 causes the outer wall of the mandrel 21 to expand and deform slightly. After the mandrel 21 expands, it quickly clamps the inner wall of the thin-walled gear.

[0056] When grinding is required around the thin-walled gear, the starting motor 23, driven by the transmission unit 24, rotates the connecting pipe 22 and the spindle 21, thereby rotating the gear for grinding. The starting motor 261 drives the magnetic rotor 272 to rotate, and the magnetic rotor 272 drives the magnetic rotor 271 to rotate through magnetic force, causing the rotating shaft 263 and the spiral blade 264 to rotate relative to the spindle 21, thus conveying the hydraulic oil in the main chamber of the spindle 21 downwards. The hydraulic oil in the main chamber flows downwards into the connecting pipe 22, and then from below the spindle 21 into each oil well. In the cavity, the oil finally returns from the top of the oil cavity to the main cavity, realizing the circulation of hydraulic oil. During this process, the heat generated by the grinding of thin-walled gears will be transferred to the hydraulic oil in each oil cavity through the gear body. While the spiral blade 264 delivers the hydraulic oil, it works with the stirring rod to fully mix the hydraulic oils of different temperatures in each oil cavity. Afterwards, before the hydraulic oil returns to the oil cavity through the connecting pipe 22, the cooling mechanism cools down the hydraulic oil, further improving the uniformity of the hydraulic oil temperature, so that the oil temperature in each oil cavity is consistent, and the sidewall of the mandrel 21 expands evenly to improve the concentricity of the clamping gear.

[0057] When grinding a thin-walled gear on one side, the electromagnet 33 generates magnetic repulsion, pushing the magnetic ring 32 upward. This drives the magnetic rotor 271, shaft 263, spring 344, housing 341, internal tube 262, and sealing ring 31 upward. After the sealing ring 31 seals the excess oil cavity of the spindle 21, it can no longer move upward. The magnetic force of the electromagnet 33 causes the magnetic ring 32, magnetic rotor 271, shaft 263, and friction ring 342 to continue moving upward until the top surface of the friction ring 342 contacts the top wall of the housing 341. The magnetic repulsion of the electromagnet 33 is further strengthened, increasing the pressure between the top surface of the friction ring 342 and the top wall of the housing 341. At this point, the motor 261 drives the shaft 263 and friction ring 342 to rotate. The friction force drives the housing 341, internal tube 262, and sealing ring 31 to rotate, adjusting the angle of the sealing ring 31. The two notches of the sealing ring 31 are aligned with the oil chamber near the gear grinding side and its corresponding oil chamber, respectively. The magnetic repulsion of the control electromagnet 33 is reduced. The elastic force of the spring 344 drives the magnetic rotor 271, the rotating shaft 263 and the friction ring 342 to move downward, so that the friction ring 342 is disengaged from the top wall of the outer shell 341. At this time, the rotation of the rotating shaft 263 no longer drives the outer shell 341 and the inner tube 262 to rotate through the friction ring 342. The rotating shaft 263 drives the spiral blade 264 to rotate, so that the hydraulic oil in the two oil chambers is circulated and mixed. The uniform oil temperature makes the expansion degree of the two sides of the spindle 21 consistent, effectively ensuring the concentricity of the gear during the processing. It is worth mentioning that, compared with the grinding of the gear around the perimeter, the spiral blade 264 rotates in the opposite direction at this time, so that the hydraulic oil in the oil chamber first enters the connecting pipe 22 and then enters the main chamber. The cooling mechanism can cool down the hydraulic oil before mixing, improving the oil temperature balance effect.

[0058] When the rotating shaft 263 and the spiral blade 264 rotate to transport hydraulic oil, the spiral blade 264 can move up and down slightly by periodically changing the magnitude of the magnetic repulsion force of the electromagnet 33. This causes the hydraulic oil inside the spiral blade 264 to flow radially and form a circulating convection, which promotes the full mixing of the hydraulic oil.

[0059] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the high concentricity gear rapid clamping and positioning grinding machine tool and its inventive concept, should be covered within the scope of protection of the present invention.

Claims

1. A high concentricity gear quick clamping and positioning grinding machine tool, comprising a machine body (10), wherein a clamping mechanism (20) is provided on the machine body (10), characterized in that, The clamping mechanism (20) includes a spindle (21), the spindle (21) has an even number of oil chambers arranged equidistantly in a circle inside, a motor (23) is fixedly installed inside the body (10), and a pressure expansion assembly (25) is provided on the top of the spindle (21). The spindle (21) is provided with a conveying assembly (26), which includes a motor (261) fixedly installed inside the machine body (10). The spindle (21) is movably connected with an internal tube (262), and the internal tube (262) is provided with a rotating shaft (263), on which a spiral blade (264) is fixed. It also includes an expansion balancing mechanism (30); When the gear is rotating and grinding, the helical blade (264) rotates to make the hydraulic oil in all the oil chambers mix and circulate; when the gear is ground on one side, the helical blade (264) rotates to make the hydraulic oil in the oil chamber near the grinding side and its corresponding oil chamber mix and circulate.

2. The high concentricity gear quick clamping and positioning grinding machine tool according to claim 1, characterized in that, A magnetic coupler (27) is provided between the rotating shaft (263) and the second motor (261). The magnetic coupler (27) includes a magnetic rotor (271) and a magnetic rotor (272) that are respectively fixed to the bottom end of the rotating shaft (263) and the top end of the drive shaft of the second motor (261).

3. The high concentricity gear quick clamping and positioning grinding machine tool according to claim 2, characterized in that, The expansion balancing mechanism (30) includes two sealing rings (31) fixed to the top of the inner tube (262) and the outside of the inner tube (262) respectively. A magnetic ring (32) is fixed to the outside of the magnetic rotor (271), and an electromagnet (33) is fixedly installed inside the body (10).

4. The high concentricity gear quick clamping and positioning grinding machine tool according to claim 2, characterized in that, The expansion balancing mechanism (30) further includes an adjustment component (34), which includes a housing (341) fixed to the inner wall of the built-in tube (262), a friction ring (342) fixed to the outside of the rotating shaft (263), a shim (343) rotatably connected to the bottom of the housing (341), and a spring (344) fixed between the shim (343) and the magnetic rotor (271).

5. The high concentricity gear quick clamping and positioning grinding machine tool according to claim 1, characterized in that, The radial thickness of the helical blade (264) is reduced.

6. The high concentricity gear quick clamping and positioning grinding machine tool according to claim 1, characterized in that, The pressurized expansion assembly (25) includes an extension tube (251) fixed to the top of the mandrel (21), a piston (252) is slidably connected inside the extension tube (251), and a threaded post (253) is threadedly connected to the top of the extension tube (251).

7. The high concentricity gear quick clamping and positioning grinding machine tool according to claim 1, characterized in that, It also includes a cooling mechanism, which includes a cooling pipe (41) rotatably connected to the outside of the connecting pipe (22), and a pump (42) with a water outlet connected to the cooling pipe (41) is installed inside the body (10).

8. The high concentricity gear quick clamping and positioning grinding machine tool according to claim 1, characterized in that, The bottom of the spindle (21) is fixed with a connecting pipe (22) that is rotatably connected to the machine body (10), and a transmission unit (24) is connected between the motor (23) and the connecting pipe (22).

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