Dynamic and static pressure grinding wheel spindle mechanism

Abstract

The utility model provides a dynamic and static pressure grinding wheel spindle mechanism, and belongs to the technical field of grinding machine equipment. The device comprises a grinding carriage and a main shaft bracket arranged at the upper end of the grinding carriage, a positioning sleeve is arranged in the main shaft bracket, a dynamic-static pressure main shaft is coaxially and rotatably connected in the positioning sleeve, and the front end and the rear end, extending out of the main shaft bracket, of the dynamic-static pressure main shaft are connected with a grinding wheel assembly and a disc type synchronous driving device respectively. The front end and the rear end, not extending out of the spindle bracket, of the dynamic-static pressure spindle are connected with the positioning sleeve through a front dynamic-static pressure bearing assembly and a rear dynamic-static pressure bearing assembly respectively. The disc type synchronous driving device is compact in structure and high in power density, directly drives the dynamic and static pressure main shaft to rotate through the electromagnetic action, reduces energy transmission loss, improves the energy utilization rate and is high in transmission efficiency. The dynamic and static pressure main shaft is stable in operation, low in noise, higher in rotation precision and good in control performance; the sealing performance between the dynamic and static pressure main shaft and the positioning sleeve is good, and external pollution is effectively prevented from entering and internal lubricating oil is effectively prevented from leaking.

Description

Technical Field

[0001] The utility model belongs to the technical field of grinding machine equipment and relates to a dynamic and static pressure grinding wheel spindle mechanism. Background Art

[0002] Traditional grinding machines use dynamic and static pressure spindles driven by motors through transmissions. These transmissions, such as pulleys, often take up considerable space. These pulleys vibrate and make a lot of noise during transmission, and can also deform elastically. This deformation is particularly pronounced at high speeds and high loads, reducing transmission accuracy and increasing the risk of transmission errors. Furthermore, due to elastic slip and slippage in belt drives, transmission efficiency is relatively low. This means that belt drives may require greater power input to transmit the same power, increasing energy consumption and operating costs. Utility Model Content

[0003] The purpose of this utility model is to provide a dynamic and static pressure grinding wheel spindle mechanism in order to solve the above problems.

[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A dynamic and static pressure grinding wheel spindle mechanism comprises a grinding wheel frame and a spindle bracket arranged at the upper end of the grinding wheel frame, a positioning sleeve is provided in the spindle bracket, a dynamic and static pressure spindle is coaxially connected to the positioning sleeve, the front and rear ends of the dynamic and static pressure spindle extending out of the spindle bracket are respectively connected to a grinding wheel assembly and a disc-type synchronous drive device, and the front and rear ends of the dynamic and static pressure spindle not extending out of the spindle bracket are connected to the positioning sleeve via a front dynamic and static pressure bearing assembly and a rear dynamic and static pressure bearing assembly respectively.

[0006] The disc-type synchronous drive device has a compact structure and high power density. It drives the dynamic and static pressure spindle to rotate directly through electromagnetic action, realizing the electric spindle of the dynamic and static pressure spindle. It has high transmission efficiency, reduces the loss of energy transmission, and improves energy utilization. The dynamic and static pressure spindle runs smoothly, has low noise, and has higher rotation accuracy and good control performance. The front dynamic and static pressure bearing assembly and the rear dynamic and static pressure bearing assembly support the weight of the dynamic and static pressure spindle and bear the load from the dynamic and static pressure spindle, which can reduce the friction and noise during the rotation of the dynamic and static pressure spindle, improve transmission efficiency, and ensure that the grinding wheel assembly achieves high-efficiency and high-precision processing.

[0007] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, the disc-type synchronous drive device includes a mounting flange arranged on the rear end of the spindle bracket, a casing is provided at the outer end of the mounting flange, the rear end of the dynamic and static pressure spindle is passed through the casing and extends into the casing, a permanent magnet stator is provided on the inner wall of the casing, and a permanent magnet rotor is provided on the rear end of the dynamic and static pressure spindle to cooperate with the permanent magnet stator.

[0008] The casing is fixed on the mounting flange. When the external frequency converter is started, the dynamic and static pressure spindle is directly driven to rotate through the electromagnetic action of the permanent magnet stator in the casing and the permanent magnet rotor on the dynamic and static pressure spindle. No other transmission device needs to be connected. Therefore, the transmission efficiency can be effectively improved, the loss of energy transmission is reduced, the energy utilization rate is improved, the rotation accuracy is higher, and the control performance is good. The dynamic and static pressure spindle runs smoothly with low noise.

[0009] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, the permanent magnet rotor is connected to the rear end of the dynamic and static pressure spindle through a coupling.

[0010] The permanent magnet rotor is connected to the rear end of the dynamic and static pressure main shaft through a coupling, ensuring the coaxial connection of the permanent magnet rotor and the dynamic and static pressure main shaft, realizing efficient power transmission, improving the stability of the transmission system, and facilitating the disassembly and assembly of the permanent magnet rotor and the dynamic and static pressure main shaft.

[0011] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, the grinding wheel assembly includes a grinding wheel flange arranged on the front end of the dynamic and static pressure spindle, and the grinding wheel flange includes a connecting shaft body and a mounting disk body coaxial with the dynamic and static pressure spindle. The inner surface of the connecting shaft body and the outer surface of the dynamic and static pressure spindle are tightly fitted through a conical surface. An installation step is provided on the outer end of the mounting disk body, and a grinding wheel is provided on the installation step. A fixing structure is also provided between the outer end of the connecting shaft body and the dynamic and static pressure spindle.

[0012] The grinding wheel is set on the mounting step of the mounting disc body. The inner surface of the connecting shaft and the outer surface of the dynamic and static pressure spindle are tightly fitted through the conical surface to achieve high-precision positioning and firm fixation to ensure that the grinding wheel will not have position deviation during rotation. The fixing structure between the outer end of the connecting shaft and the dynamic and static pressure spindle is used to fix the connecting shaft body, ensure that the grinding wheel flange is firmly fixed, and facilitate the disassembly and assembly of the grinding wheel flange.

[0013] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, the fixed structure includes an inner positioning step arranged on the outer end of the connecting shaft, a fixing sleeve is sleeved on the outer end of the dynamic and static pressure spindle, the inner end of the fixing sleeve abuts on the inner positioning step, and a fixing boss is provided at the outer end of the fixing sleeve. The outermost end of the dynamic and static pressure spindle is screwed with a fixing bolt, and the inner end of the fixing bolt abuts against the fixing boss.

[0014] The inner end of the fixing sleeve rests on the inner positioning step at the outer end of the connecting shaft to play a role of limiting and fixing, which can prevent the connecting shaft from shifting to the outer end and falling off, ensuring that the inner surface of the connecting shaft and the outer surface of the dynamic and static pressure spindle are tightly fitted through the conical surface. The fixing bolt is tightened to rest against the fixing boss of the fixing sleeve, ensuring that the fixing sleeve is tightly against the inner positioning step at the outer end of the connecting shaft to ensure that the grinding wheel flange is firmly fixed.

[0015] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, the front dynamic and static pressure bearing assembly includes a first front positioning inner step arranged on the outer wall of the front end of the dynamic and static pressure spindle, and a second front positioning inner step is provided on the inner wall of the front end of the positioning sleeve. A plurality of front dynamic and static pressure bearings are sleeved on the front end of the dynamic and static pressure spindle, and the inner and outer rings of the front dynamic and static pressure bearings are respectively abutted against the step sides of the first front positioning inner step and the second front positioning inner step. A plurality of the front dynamic and static pressure bearings form a front bearing group, and the inner end of the front bearing group abuts against the step bottom surface of the second front positioning inner step to form a single-sided limit, and the outer end of the front bearing group is provided with a front sealing structure.

[0016] The front dynamic and static pressure bearings mounted on the front end of the dynamic and static pressure main shaft support the weight of the dynamic and static pressure main shaft and bear the load from the dynamic and static pressure main shaft, which can reduce the friction during the rotation of the dynamic and static pressure main shaft, reduce noise, and improve transmission efficiency. The front sealing structure at the outer end of the front bearing group cooperates with the second front positioning inner step on the positioning sleeve to position and fix the front bearing group, preventing the front dynamic and static pressure bearings from shifting and falling off, and the front sealing structure plays a sealing role, which can prevent external pollution from entering and internal lubricant from leaking.

[0017] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, the front sealing structure includes a front sealing flange sleeved on the front end of the dynamic and static pressure spindle, the outer end of the positioning sleeve is provided with a positioning table connected to the outer end of the spindle bracket, the inner end of the front sealing flange is connected to the outer end of the positioning table, the inner end of the front sealing flange is provided with a front positioning boss and a front positioning groove, the inner end of the front positioning boss and the front positioning groove are provided with a front seal, and the front seal is abutted against the outer end of the front bearing group.

[0018] The front sealing flange plays a sealing role. The inner end of the front positioning boss and the front seal in the front positioning groove abut against the outer end of the front bearing group, and the inner end of the front bearing group abuts against the bottom surface of the second front positioning inner step, thereby realizing the positioning and fixation of the front bearing group, preventing the front dynamic and static pressure bearings from shifting and falling off, and ensuring the sealing performance.

[0019] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, the rear dynamic and static pressure bearing assembly includes a first rear positioning inner step arranged on the outer wall of the rear end of the dynamic and static pressure spindle, a second rear positioning inner step is provided on the inner wall of the rear end of the positioning sleeve, and a plurality of rear dynamic and static pressure bearings are sleeved on the rear end of the dynamic and static pressure spindle, and the inner and outer rings of the rear dynamic and static pressure bearings respectively abut against the step side surfaces of the first rear positioning inner step and the second rear positioning inner step, and a plurality of the rear dynamic and static pressure bearings form a rear bearing group, and the inner end of the rear bearing group abuts against the step bottom surfaces of the first rear positioning inner step and the second rear positioning inner step to form a unilateral limit, and a rear sealing flange connected to the positioning sleeve is provided on the rear end of the dynamic and static pressure spindle, and the inner end of the rear sealing flange is provided with a rear positioning boss and a rear positioning groove, and a rear seal is provided in the inner end of the rear positioning boss and the rear positioning groove, and the rear seal abuts against the outer end of the rear bearing group.

[0020] The rear dynamic and static pressure bearings mounted on the rear end of the dynamic and static pressure main shaft support the weight of the dynamic and static pressure main shaft and bear the load from the static pressure main shaft. They can reduce the friction during the rotation of the dynamic and static pressure main shaft, reduce noise, and improve transmission efficiency. The rear sealing flange at the outer end of the rear bearing group cooperates with the first rear positioning inner step and the second rear positioning inner step to position and fix the rear bearing group, preventing the rear dynamic and static pressure bearings from shifting and falling off. The rear sealing flange also plays a sealing role, which can prevent external pollution from entering and internal lubricant from leaking.

[0021] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, a front sealing groove is further provided on the inner end of the front sealing flange, a front sealing ring is provided in the front sealing groove and abuts against the outer end of the positioning frustum, and a rear sealing groove is further provided on the inner end of the rear sealing flange, a rear sealing ring is provided in the rear sealing groove and abuts against the outer end of the positioning sleeve.

[0022] The front sealing ring can ensure the sealing between the front sealing flange and the positioning sleeve, and the rear sealing ring can ensure the sealing between the rear sealing flange and the positioning sleeve respectively.

[0023] In the above-mentioned dynamic and static pressure grinding wheel spindle mechanism, a sealed heat dissipation channel is distributed between the outer wall of the permanent magnet stator and the inner wall of the casing, and the casing is provided with a liquid inlet and a liquid outlet connected to the heat dissipation channel.

[0024] The coolant enters the heat dissipation channel from the liquid inlet to achieve liquid cooling of the permanent magnet stator and reduce the temperature inside the casing.

[0025] Compared with existing technologies, the advantages of this utility model are: 1. The disc-type synchronous drive device has a compact structure and high power density. It directly drives the dynamic and static pressure spindles through electromagnetic action, reducing energy transmission losses, improving energy utilization, and achieving high transmission efficiency. 2. The dynamic and static pressure spindles operate smoothly, with low noise, higher rotation accuracy, and excellent control performance. 3. The seal between the dynamic and static pressure spindles and the positioning sleeve is excellent, effectively preventing external contamination and internal lubricating oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure provided by the utility model;

[0027] Figure 2 It is a cross-sectional view provided by the utility model;

[0028] Figure 3 It is a cross-sectional view of the dynamic and static pressure spindle;

[0029] Figure 4 It is a structural diagram of the dynamic and static pressure spindle.

[0030] In the figure, the grinding wheel frame 1, the spindle bracket 2, the positioning sleeve 3, the dynamic and static pressure spindle 4, the grinding wheel assembly 5, the disc synchronous drive device 6, the front dynamic and static pressure bearing assembly 7, the rear dynamic and static pressure bearing assembly 8, the mounting flange 9, the housing 10, the permanent magnet stator 11, the permanent magnet rotor 12, the coupling 13, the grinding wheel flange 14, the connecting shaft 15, the mounting disc 16, the mounting step 17, the grinding wheel 18, the fixing structure 19, the inner positioning step 20, the fixing sleeve 21, the fixing boss 22, the fixing bolt 23, the first front positioning inner step 24, the second front positioning inner step 25, the front dynamic Static pressure bearing 26, front bearing group 27, front sealing structure 28, positioning groove 29, first seal 30, front sealing flange 31, positioning cone 32, front positioning boss 33, front positioning groove 34, front seal 35, first rear positioning inner step 36, second rear positioning inner step 37, rear static and dynamic bearing 38, rear bearing group 39, rear sealing flange 40, rear positioning boss 41, rear seal 42, second seal 43, front sealing groove 44, front sealing ring 45, rear sealing groove 46, rear sealing ring 47, rear positioning groove 48, outer end sealing ring 49. DETAILED DESCRIPTION

[0031] like Figure 1-Figure 4 As shown, a dynamic and static pressure grinding wheel spindle mechanism includes a grinding wheel frame 1 and a spindle bracket 2 arranged at the upper end of the grinding wheel frame 1, a positioning sleeve 3 is provided in the spindle bracket 2, and a dynamic and static pressure spindle 4 is coaxially connected to the positioning sleeve 3. The front and rear ends of the dynamic and static pressure spindle 4 extending out of the spindle bracket 2 are respectively connected to a grinding wheel assembly 5 and a disc-type synchronous drive device 6, and the front and rear ends of the dynamic and static pressure spindle 4 not extending out of the spindle bracket 2 are connected to the positioning sleeve 3 through a front dynamic and static pressure bearing assembly 7 and a rear dynamic and static pressure bearing assembly 8 respectively.

[0032] In the present invention, the rotation of the dynamic and static pressure spindle 4 is directly driven by the disc-type synchronous driving device 6 at the rear end. The rotation of the dynamic and static pressure spindle 4 drives the grinding wheel assembly 5 at the front end to operate and grind the workpiece.

[0033] The disc-type synchronous drive device 6 has a compact structure and high power density. It drives the dynamic and static pressure spindle 4 to rotate directly through electromagnetic action, realizing the electric spindle of the dynamic and static pressure spindle 4, with high transmission efficiency, reducing the loss of energy transmission, and improving energy utilization. The dynamic and static pressure spindle 4 runs smoothly, with low noise, and has higher rotation accuracy and good control performance. The front dynamic and static pressure bearing assembly 7 and the rear dynamic and static pressure bearing assembly 8 support the weight of the dynamic and static pressure spindle 4 and bear the load from the dynamic and static pressure spindle 4, which can reduce the friction and noise during the rotation of the dynamic and static pressure spindle 4, improve transmission efficiency, and ensure that the grinding wheel assembly 5 achieves high-efficiency and high-precision processing.

[0034] Specifically, combined Figure 1-Figure 4 As shown, the disc-type synchronous drive device 6 includes a mounting flange 9 arranged on the rear end of the spindle bracket 2, a housing 10 is provided at the outer end of the mounting flange 9, the rear end of the dynamic and static pressure spindle 4 is passed through the housing 10 and extends into the housing 10, a permanent magnet stator 11 is provided on the inner wall of the housing 10, and a permanent magnet rotor 12 is provided on the rear end of the dynamic and static pressure spindle 4 to cooperate with the permanent magnet stator 11.

[0035] The casing 10 is fixed on the mounting flange 9. When the external frequency converter is started, the dynamic and static pressure main shaft 4 is directly driven to rotate through the electromagnetic action of the permanent magnet stator 11 in the casing 10 and the permanent magnet rotor 12 on the dynamic and static pressure main shaft 4. There is no need to connect other transmission devices. Therefore, it can effectively improve the transmission efficiency, reduce the loss of energy transmission, improve the energy utilization rate, and has higher rotation accuracy and good control performance. The dynamic and static pressure main shaft 4 runs smoothly and has low noise.

[0036] Specifically, combined Figure 2-Figure 4 As shown, the permanent magnet rotor 12 is connected to the rear end of the dynamic and static pressure main shaft 4 through a coupling 13.

[0037] The permanent magnet rotor 12 is connected to the rear end of the dynamic and static pressure main shaft 4 through a coupling 13, ensuring the coaxial connection between the permanent magnet rotor 12 and the dynamic and static pressure main shaft 4, achieving efficient power transmission, improving the stability of the transmission system, and facilitating the disassembly and assembly of the permanent magnet rotor 12 and the dynamic and static pressure main shaft 4.

[0038] Specifically, combined Figure 1-Figure 4As shown, the grinding wheel assembly 5 includes a grinding wheel flange 14 arranged on the front end of the dynamic and static pressure spindle 4. The grinding wheel flange 14 includes a connecting shaft body 15 and a mounting disc body 16 that are coaxial with the dynamic and static pressure spindle 4. The inner surface of the connecting shaft body 15 and the outer surface of the dynamic and static pressure spindle 4 are tightly fitted through a conical surface. A mounting step 17 is provided on the outer end of the mounting disc body 16, and a grinding wheel 18 is provided on the mounting step 17. A fixing structure 19 is also provided between the outer end of the connecting shaft body 15 and the dynamic and static pressure spindle 4.

[0039] The grinding wheel 18 is arranged on the mounting step 17 of the mounting disc body 16. The inner surface of the connecting shaft body 15 and the outer surface of the dynamic and static pressure spindle 4 are tightly fitted through the conical surface to achieve high-precision positioning and firm fixation to ensure that the grinding wheel 18 will not have position deviation during rotation. The fixing structure 19 between the outer end of the connecting shaft body 15 and the dynamic and static pressure spindle 4 is used to fix the connecting shaft body 15, ensure that the grinding wheel flange 14 is firmly fixed, and facilitate the disassembly and assembly of the grinding wheel flange 14.

[0040] Specifically, combined Figure 1-Figure 3 As shown, the fixing structure 19 includes an inner positioning step 20 arranged on the outer end of the connecting shaft body 15, a fixing sleeve 21 is sleeved on the outer end of the dynamic and static pressure main shaft 4, the inner end of the fixing sleeve 21 abuts against the inner positioning step 20, and a fixing boss 22 is provided at the outer end of the fixing sleeve 21. A fixing bolt 23 is screwed to the outermost end of the dynamic and static pressure main shaft 4, and the inner end of the fixing bolt 23 abuts against the fixing boss 22.

[0041] The inner end of the fixing sleeve 21 abuts against the inner positioning step 20 at the outer end of the connecting shaft body 15 to play a role of limiting and fixing, which can prevent the connecting shaft body 15 from shifting toward the outer end and falling off, ensuring that the inner surface of the connecting shaft body 15 and the outer surface of the dynamic and static pressure spindle 4 are tightly fitted through the conical surface. The fixing bolt 23 is tightened to abut against the fixing boss 22 of the fixing sleeve 21, ensuring that the fixing sleeve 21 is tightly abutted against the inner positioning step 20 at the outer end of the connecting shaft body 15 to ensure that the grinding wheel flange 14 is firmly fixed.

[0042] Specifically, combined Figure 2-Figure 4 As shown, the front dynamic and static pressure bearing assembly 7 includes a first front positioning inner step 24 arranged on the outer wall of the front end of the dynamic and static pressure main shaft 4, a second front positioning inner step 25 is provided on the inner wall of the front end of the positioning sleeve 3, and a plurality of front dynamic and static pressure bearings 26 are sleeved on the front end of the dynamic and static pressure main shaft 4. The inner and outer rings of the front dynamic and static pressure bearings 26 are respectively abutted against the step sides of the first front positioning inner step 24 and the second front positioning inner step 25. The plurality of front dynamic and static pressure bearings 26 form a front bearing group 27. The inner end of the front bearing group 27 abuts against the step bottom surface of the second front positioning inner step 25 to form a single-sided limit, and the outer end of the front bearing group 27 is provided with a front sealing structure 28.

[0043] The front dynamic and static pressure bearing 26 mounted on the front end of the dynamic and static pressure main shaft 4 supports the weight of the dynamic and static pressure main shaft 4 and bears the load from the dynamic and static pressure main shaft 4. It can reduce the friction during the rotation of the dynamic and static pressure main shaft 4, reduce noise, and improve transmission efficiency. The front sealing structure 28 at the outer end of the front bearing group 27 cooperates with the second front positioning inner step 25 on the positioning sleeve 3 to position and fix the front bearing group 27, preventing the front dynamic and static pressure bearing 26 from shifting and falling off, and the front sealing structure 28 plays a sealing role, which can prevent external pollution from entering and internal lubricant from leaking.

[0044] Specifically, combined Figure 2-Figure 4 As shown, the front sealing structure 28 includes a front sealing flange 31 which is sleeved on the front end of the dynamic and static pressure main shaft 4. The outer end of the positioning sleeve 3 is provided with a positioning cone 32 connected to the outer end of the main shaft bracket 2. The inner end of the front sealing flange 31 is connected to the outer end of the positioning cone 32. The inner end of the front sealing flange 31 is provided with a front positioning boss 33 and a front positioning groove 34. The inner end of the front positioning boss 33 and the front positioning groove 34 are provided with a front seal 35. The front seal 35 abuts against the outer end of the front bearing group 27.

[0045] The front sealing flange 31 plays a sealing role, the inner end of the front positioning boss 33 and the front seal 35 in the front positioning groove 34 abut against the outer end of the front bearing group 27, and the inner end of the front bearing group 27 abuts against the bottom surface of the second front positioning inner step 25, thereby realizing the positioning and fixation of the front bearing group 27, preventing the front dynamic and static pressure bearings 26 from shifting and falling off, and ensuring the sealing performance.

[0046] Specifically, combined Figure 2-Figure 4 As shown, the rear dynamic and static pressure bearing assembly 8 includes a first rear positioning inner step 36 arranged on the outer wall of the rear end of the dynamic and static pressure main shaft 4, a second rear positioning inner step 37 is provided on the inner wall of the rear end of the positioning sleeve 3, and a plurality of rear dynamic and static pressure bearings 38 are sleeved on the rear end of the dynamic and static pressure main shaft 4. The inner and outer rings of the rear dynamic and static pressure bearings 38 respectively abut against the step side surfaces of the first rear positioning inner step 36 and the second rear positioning inner step 37. A plurality of rear dynamic and static pressure bearings 38 form a rear bearing group 39. The inner end of the rear bearing group 39 abuts against the step bottom surfaces of the first rear positioning inner step 36 and the second rear positioning inner step 37 to form a unilateral limit. A rear sealing flange 40 connected to the positioning sleeve 3 is provided on the rear end of the dynamic and static pressure main shaft 4, and the inner end of the rear sealing flange 40 is provided with a rear positioning boss 41 and a rear positioning groove 48. A rear seal 42 is provided in the inner end of the rear positioning boss 41 and the rear positioning groove 48, and the rear seal 42 abuts against the outer end of the rear bearing group 39.

[0047] The rear dynamic and static pressure bearing 38 mounted on the rear end of the dynamic and static pressure main shaft 4 supports the weight of the dynamic and static pressure main shaft 4 and bears the load from the static pressure main shaft 4. It can reduce the friction during the rotation of the dynamic and static pressure main shaft 4, reduce noise, and improve transmission efficiency. The rear sealing flange 40 at the outer end of the rear bearing group 39 cooperates with the first rear positioning inner step 36 and the second rear positioning inner step 37 to position and fix the rear bearing group 39, preventing the rear dynamic and static pressure bearing 38 from shifting and falling off, and the rear sealing flange 40 plays a sealing role, which can prevent external pollution from entering and internal lubricant from leaking.

[0048] The rear sealing flange 40 plays a sealing role, and the inner end of the rear positioning boss 41 and the rear seal 42 in the rear positioning groove 48 abut against the outer end of the rear bearing group 39, which plays a role in positioning and fixing the rear bearing group 39, preventing the rear dynamic and static pressure bearings 38 from shifting and falling off, and ensuring the sealing performance.

[0049] Preferably, combined Figure 2-Figure 4 As shown, the inner end of the second front positioning inner step 25 is located on the inner wall of the positioning sleeve 3 and a positioning groove 29 is provided. A first sealing member 30 is provided between the positioning groove 29 and the first front positioning inner step 24 .

[0050] A second sealing member 43 is provided between the inner end of the rear bearing assembly 39 and the first rear positioning inner step 36 and the second rear positioning inner step 37 .

[0051] The first sealing member 30 and the second sealing member 43 seal the oil chamber between the dynamic and static pressure main shaft 4 and the positioning sleeve 3 .

[0052] Preferably, combined Figure 2 and Figure 3 As shown, a front sealing groove 44 is provided on the inner end of the front sealing flange 31, and a front sealing ring 45 is provided in the front sealing groove 44 to abut against the outer end of the positioning cone 32. A rear sealing groove 46 is also provided on the inner end of the rear sealing flange 40, and a rear sealing ring 47 is provided in the rear sealing groove 46 to abut against the outer end of the positioning sleeve 3.

[0053] The front sealing ring 45 can ensure the sealing between the front sealing flange 31 and the positioning sleeve 3 , and the rear sealing ring 47 can ensure the sealing between the rear sealing flange 40 and the positioning sleeve 3 .

[0054] Preferably, combined Figure 2 and Figure 3 As shown, an outer end sealing ring 49 is provided at the outer end of the front sealing flange 31 .

[0055] The outer end sealing ring 49 plays a role in strengthening the seal.

[0056] Specifically, a sealed heat dissipation channel is distributed between the outer wall of the permanent magnet stator 11 and the inner wall of the housing 10 , and the housing 10 is provided with a liquid inlet and a liquid outlet connected to the heat dissipation channel.

[0057] The coolant enters the heat dissipation channel from the liquid inlet, thereby achieving liquid cooling of the permanent magnet stator 11 and reducing the temperature inside the housing 10 .

[0058] The working principle of the present invention is as follows: starting an external frequency converter directly drives the dynamic and static pressure spindle 4 to rotate through the electromagnetic action of the permanent magnet stator 11 in the housing 10 and the permanent magnet rotor 12 on the dynamic and static pressure spindle 4, without connecting to other transmission devices. The rotation of the dynamic and static pressure spindle 4 drives the front end grinding wheel 18 to rotate and grind the workpiece;

[0059] The grinding wheel 18 is set on the mounting step 17 of the mounting plate 16, and the tightening fixing bolt 23 is used to abut the fixing boss 22 of the fixing sleeve 21, ensuring that the fixing sleeve 21 is tightly against the inner positioning step 20 at the outer end of the connecting shaft body 15, playing a role of limiting and fixing, which can prevent the connecting shaft body 15 from shifting and falling off toward the outer end, ensuring that the inner surface of the connecting shaft body 15 and the outer surface of the dynamic and static pressure spindle 4 are tightly fitted through the conical surface, ensuring that the grinding wheel flange 14 is firmly fixed;

[0060] The inner and outer ends of the front bearing group 27 at the front end of the dynamic and static pressure main shaft 4 are respectively pressed against the step bottom surface of the second front positioning inner step 25 and the front seal 35 to achieve positioning, and the inner and outer ends of the rear bearing group 39 at the rear end of the dynamic and static pressure main shaft 4 are respectively pressed against the step bottom surface of the first rear positioning inner step 36, the second rear positioning inner step 37 and the rear seal 42 to achieve positioning, supporting the weight of the dynamic and static pressure main shaft 4 and bearing the load from the static pressure main shaft 4, which can reduce the friction and noise during the rotation of the dynamic and static pressure main shaft 4 and improve the transmission efficiency. The front bearing group 27 and the rear bearing group 39 play a role in supporting the weight of the dynamic and static pressure main shaft 4 and bearing the load from the static pressure main shaft 4, which can reduce the friction and noise during the rotation of the dynamic and static pressure main shaft 4 and improve the transmission efficiency; the front sealing flange 31 and the rear sealing flange 40 play a sealing role, which can prevent external pollution from entering and internal lubricant from leaking.

[0061] The specific embodiments described herein are merely illustrative of the spirit of the present invention. Persons skilled in the art may make various modifications, additions, or substitutions to the described specific embodiments without departing from the spirit of the present invention or exceeding the scope defined by the appended claims.

[0062] Although this article uses more grinding wheel frame 1, spindle bracket 2, positioning sleeve 3, dynamic and static pressure spindle 4, grinding wheel assembly 5, disc synchronous drive device 6, front dynamic and static pressure bearing assembly 7, rear dynamic and static pressure bearing assembly 8, mounting flange 9, housing 10, permanent magnet stator 11, permanent magnet rotor 12, coupling 13, grinding wheel flange 14, connecting shaft 15, mounting disc body 16, mounting step 17, grinding wheel 18, fixing structure 19, inner positioning step 20, fixing sleeve 21, fixing boss 22, fixing bolt 23, first front positioning inner step 24, second front positioning inner step 25, front dynamic and static pressure bearing 26, front bearing group 27, front sealing structure 28, positioning groove 2 9. The first seal 30, front sealing flange 31, positioning cone 32, front positioning boss 33, front positioning groove 34, front seal 35, first rear positioning inner step 36, second rear positioning inner step 37, rear dynamic and static pressure bearing 38, rear bearing group 39, rear sealing flange 40, rear positioning boss 41, rear seal 42, second seal 43, front sealing groove 44, front sealing ring 45, rear sealing groove 46, rear sealing ring 47, rear positioning groove 48, outer end sealing ring 49, etc. These terms are used only to more conveniently describe and explain the essence of the present invention; interpreting them as any additional restrictions is contrary to the spirit of the present invention.

Claims

1. A dynamic and static pressure grinding wheel spindle mechanism, comprising a grinding wheel frame (1) and a spindle bracket (2) arranged at the upper end of the grinding wheel frame (1), wherein a positioning sleeve (3) is arranged in the spindle bracket (2), and a dynamic and static pressure spindle (4) is coaxially rotatably connected in the positioning sleeve (3), characterized in that: The front and rear ends of the dynamic and static pressure spindle (4) extending out of the spindle bracket (2) are respectively connected to a grinding wheel assembly (5) and a disc-type synchronous drive device (6); the front and rear ends of the dynamic and static pressure spindle (4) not extending out of the spindle bracket (2) are respectively connected to the positioning sleeve (3) through a front dynamic and static pressure bearing assembly (7) and a rear dynamic and static pressure bearing assembly (8); the disc-type synchronous drive device (6) comprises a mounting flange (9) arranged on the rear end of the spindle bracket (2); a casing (10) is arranged at the outer end of the mounting flange (9); the rear end of the dynamic and static pressure spindle (4) is penetrated by the casing (10) and extends into the casing (10); a permanent magnet stator (11) is arranged on the inner wall of the casing (10); and a permanent magnet rotor (12) matching the permanent magnet stator (11) is sleeved on the rear end of the dynamic and static pressure spindle (4).

2. The dynamic and static pressure grinding wheel spindle mechanism according to claim 1, characterized in that: The permanent magnet rotor (12) is connected to the rear end of the dynamic and static pressure main shaft (4) through a coupling (13).

3. The dynamic and static pressure grinding wheel spindle mechanism according to claim 1, characterized in that: The grinding wheel assembly (5) comprises a grinding wheel flange (14) arranged on the front end of the dynamic and static pressure spindle (4), and the grinding wheel flange (14) comprises a connecting shaft (15) and a mounting plate (16) coaxial with the dynamic and static pressure spindle (4). The inner surface of the connecting shaft (15) and the outer surface of the dynamic and static pressure spindle (4) are tightly fitted through a conical surface. A mounting step (17) is provided on the outer end of the mounting plate (16), and a grinding wheel (18) is provided on the mounting step (17). A fixing structure (19) is also provided between the outer end of the connecting shaft (15) and the dynamic and static pressure spindle (4).

4. The dynamic and static pressure grinding wheel spindle mechanism according to claim 3, characterized in that: The fixing structure (19) comprises an inner positioning step (20) arranged on the outer end of the connecting shaft (15); a fixing sleeve (21) is sleeved on the outer end of the dynamic and static pressure main shaft (4); the inner end of the fixing sleeve (21) abuts against the inner positioning step (20); a fixing boss (22) is provided at the outer end of the fixing sleeve (21); a fixing bolt (23) is screwed on the outermost end of the dynamic and static pressure main shaft (4); the inner end of the fixing bolt (23) abuts against the fixing boss (22).

5. The dynamic and static pressure grinding wheel spindle mechanism according to claim 1, characterized in that: The front dynamic and static pressure bearing assembly (7) comprises a first front positioning inner step (24) arranged on the front end outer wall of the dynamic and static pressure main shaft (4), a second front positioning inner step (25) is arranged on the front end inner wall of the positioning sleeve (3), a plurality of front dynamic and static pressure bearings (26) are sleeved on the front end of the dynamic and static pressure main shaft (4), the inner and outer rings of the front dynamic and static pressure bearings (26) respectively abut against the step sides of the first front positioning inner step (24) and the second front positioning inner step (25), a plurality of the front dynamic and static pressure bearings (26) form a front bearing group (27), the inner end of the front bearing group (27) abuts against the step bottom surface of the second front positioning inner step (25) to form a single-side limit, and the outer end of the front bearing group (27) is provided with a front sealing structure (28).

6. The dynamic and static pressure grinding wheel spindle mechanism according to claim 5, characterized in that: The front sealing structure (28) comprises a front sealing flange (31) sleeved on the front end of the dynamic and static pressure main shaft (4); the outer end of the positioning sleeve (3) is provided with a positioning table (32) connected to the outer end of the main shaft bracket (2); the inner end of the front sealing flange (31) is connected to the outer end of the positioning table (32); the inner end of the front sealing flange (31) is provided with a front positioning boss (33) and a front positioning groove (34); the inner end of the front positioning boss (33) and the front positioning groove (34) are provided with a front seal (35); the front seal (35) is abutted against the outer end of the front bearing group (27).

7. The dynamic and static pressure grinding wheel spindle mechanism according to claim 6, characterized in that: The rear dynamic and static pressure bearing assembly (8) comprises a first rear positioning inner step (36) arranged on the rear end outer wall of the dynamic and static pressure main shaft (4), a second rear positioning inner step (37) is arranged on the rear end inner wall of the positioning sleeve (3), a plurality of rear dynamic and static pressure bearings (38) are sleeved on the rear end of the dynamic and static pressure main shaft (4), the inner and outer rings of the rear dynamic and static pressure bearings (38) are respectively abutted against the step sides of the first rear positioning inner step (36) and the second rear positioning inner step (37), and the plurality of rear dynamic and static pressure bearings (38) form a rear bearing group (39), wherein The inner end of the rear bearing group (39) abuts against the bottom surfaces of the first rear positioning inner step (36) and the second rear positioning inner step (37) to form a single-side limit, and the rear end of the dynamic and static pressure main shaft (4) is provided with a rear sealing flange (40) connected to the positioning sleeve (3), and the inner end of the rear sealing flange (40) is provided with a rear positioning boss (41) and a rear positioning groove (48), and the inner end of the rear positioning boss (41) and the rear positioning groove (48) are provided with a rear sealing member (42), and the rear sealing member (42) abuts against the outer end of the rear bearing group (39).

8. The dynamic and static pressure grinding wheel spindle mechanism according to claim 7, characterized in that: The front sealing flange (31) is provided with a front sealing groove (44) on the inner end thereof, and a front sealing ring (45) is provided in the front sealing groove (44) and abuts against the outer end of the positioning truncated table (32). The rear sealing flange (40) is provided with a rear sealing groove (46) on the inner end thereof, and a rear sealing ring (47) is provided in the rear sealing groove (46) and abuts against the outer end of the positioning sleeve (3).

9. The dynamic and static pressure grinding wheel spindle mechanism according to claim 1, characterized in that: A sealed heat dissipation channel is distributed between the outer wall of the permanent magnet stator (11) and the inner wall of the casing (10), and the casing (10) is provided with a liquid inlet and a liquid outlet connected to the heat dissipation channel.

Images