A fluid bearing device for a machine tool spindle

Abstract

The present invention discloses a fluid bearing device for a machine tool spindle, which relates to the field of spindle fluid bearings, and comprises a lower shell and an upper shell, wherein the lower shell is fixedly connected to the upper shell, and a lower inner shell is installed on the inner side of the lower shell. The present invention realizes automatic delivery and oil film formation of lubricating oil through rotational motion, and significantly improves the operating stability and lubrication efficiency of the bearing system. The coordinated control mechanism of the flow limiting groove and the drainage groove accurately controls the fluid flow and flow velocity, optimizes the load distribution, reduces eddy currents, vibrations and high-frequency vibrations, and ensures the optimal state of the oil film thickness, and enhances the load bearing capacity. In addition, the design also effectively manages the internal temperature of the bearing, prevents the negative impact of high temperature on the lubrication performance, and realizes uniform distribution of the lubricating oil, significantly improves the lubrication effect, prolongs the service life of the spindle, reduces wear, and provides a strong guarantee for the long-term stable operation of the bearing system.

Description

Technical Field

[0001] The invention relates to the technical field of spindle fluid bearings, in particular to a fluid bearing device for a machine tool spindle. Background Art

[0002] The machine tool spindle refers to the axis on the machine tool that drives the workpiece or tool to rotate. The spindle components are usually composed of the spindle, bearings and transmission parts (gears or pulleys). In the machine, it is mainly used to support transmission parts such as gears and pulleys, transmit motion and torque, such as the machine tool spindle; some are used to clamp workpieces, such as the spindle. Fluid bearings are a type of efficient bearing that uses fluid (gas or liquid) as a supporting medium to support and balance the load on the bearing through the pressure generated by the fluid.

[0003] For example, the "fluid bearing device" with the publication number CN101600892B comprises: a shaft; a first and a second flange portion as a sealing portion fixed to the shaft portion. A first sealing space and a second sealing space are formed on the outer peripheral sides of the first and the second flange portions, respectively. An oil-proof film is provided on the end surfaces of the first and the second flange portions that are in contact with the external air, separated from the pressure-bearing surfaces that are subjected to the applied pressure during assembly.

[0004] However, in the prior art, as the spindle continues to run, insufficient fluid will appear inside the fluid bearing, which will directly lead to increased friction, thereby weakening the heat dissipation effect, causing the lubricating oil temperature to rise, and ultimately having an adverse effect on the performance and life of the bearing. On the other hand, excess fluid also causes eddy currents and vibrations, posing a threat to the stable operation of the bearing. What is more complicated is that long-term operation and insufficient heat dissipation will also cause changes in the viscosity of the lubricating oil. Whether it is too high or too low, it will directly affect the fluidity of the fluid and cause uneven pressure distribution. This uneven pressure will further aggravate the deformation or wear of the bearing. Summary of the invention

[0005] The purpose of the present invention is to provide a fluid bearing device for a machine tool spindle to solve the problem that insufficient fluid in the fluid bearing leads to increased friction, weakened heat dissipation, increased oil temperature, and damage to bearing performance and life. Excessive fluid leads to eddy vibration, threatening stability, insufficient heat dissipation during long-term operation, changes in lubricating oil viscosity, affected fluidity, and uneven pressure that exacerbates bearing wear.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a fluid bearing device for a machine tool spindle, comprising a lower shell and an upper shell, the lower shell is fixedly connected to the upper shell, a lower inner shell is installed on the inner side of the lower shell, a cavity is provided at the top of the upper shell, an upper inner shell is installed on the inner side of the cavity, an oil storage groove is provided inside the lower shell, a plurality of cooling grooves are provided at the bottom of the oil storage groove, a mounting hole is provided at the bottom end of the lower shell, a limited flow groove is provided at the middle part of the inner side of the lower inner shell, a plurality of drainage grooves are provided on the outer surface of the limited flow groove, sealing grooves are provided on the outer surfaces of both ends of the lower inner shell, a sealing ring is installed inside the sealing groove, a compensation hole is provided at the top of the upper inner shell, a compensation part is installed inside the compensation hole, a locking rod is fixedly connected to the center of the top of the upper shell, and a supplementary part is installed inside the locking rod;

[0007] The compensation part includes an outer tube body, which is fixedly connected to the inside of the compensation hole, the inner tube body is fixedly connected to the inner wall of the outer tube body, a clamping block is fixedly connected to the inner wall of one end of the inner tube body, clamping grooves are provided on both sides of the clamping block, and the inner wall of the inner tube body is slidably connected to a limiting plate.

[0008] Preferably, a movable rod is fixedly connected to the middle of one side of the limiting plate, a first blocking plate is fixedly connected to one end of the movable rod, and a second blocking plate is fixedly connected to the outer surface of the middle of the movable rod.

[0009] Preferably, a second spring is installed between one side of the limiting plate and the inner wall of the inner tube body, the two clamping grooves are respectively clamped with the first blocking plate and the second blocking plate, and one end of the first blocking plate is clamped with one end of the outer tube body.

[0010] Preferably, the supplementary part includes a fixed sleeve and an installation sleeve, the installation sleeve is slidably connected to the fixed sleeve, and the outer diameter of the bottom end of the installation sleeve is smaller than the inner diameter of the top end of the fixed sleeve, a liquid inlet pipe is slidably connected to the inner side of the installation sleeve, a rotating sleeve is rotatably connected inside the fixed sleeve, and a driving groove is opened on the outer wall of the rotating sleeve.

[0011] Preferably, a slide groove is provided on the inner wall of the fixing sleeve, a driving block is slidably connected inside the slide groove, the driving block is fixedly connected to the bottom end of the mounting sleeve, and the driving block is located inside the driving groove.

[0012] Preferably, a replenishing pipe is fixedly connected to the bottom end of the rotating sleeve, the replenishing pipe is fixedly connected to the bottom end of the liquid inlet pipe, and a replenishing hole is opened at the bottom end of the replenishing pipe.

[0013] Preferably, a bottom sleeve is fixedly connected to the bottom of the fixing sleeve, and a through hole on one side of the bottom sleeve is connected to the supplementary hole.

[0014] Preferably, a first spring is installed on the inner side of the rotating sleeve, the top end of the first spring is located on the inner side of the mounting sleeve, and the first spring is sleeved on the outer surface of the liquid inlet pipe.

[0015] Preferably, a ring body is installed on the inner side of the upper shell, the bottom end of the ring body is located inside the oil storage groove, and the top end of the mounting hole is embedded in the cooling groove.

[0016] Preferably, a heat conducting plate is installed inside the mounting hole, and a cooling pipe is installed inside the heat conducting plate.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. In the present invention, automatic delivery and oil film formation of lubricating oil are realized through rotational motion, which significantly improves the operating stability and lubrication efficiency of the bearing system. The coordinated control mechanism of the flow limiting groove and the drainage groove accurately controls the fluid flow rate and flow velocity, optimizes the load distribution, reduces eddy currents, vibrations and high-frequency vibrations, and ensures the optimal state of oil film thickness, thereby enhancing the load bearing capacity. In addition, the design also effectively manages the internal temperature of the bearing, prevents the negative impact of high temperature on the lubrication performance, and realizes the uniform distribution of lubricating oil, significantly improves the lubrication effect, prolongs the service life of the main shaft, reduces wear, and provides a strong guarantee for the long-term stable operation of the bearing system.

[0019] 2. In the present invention, when high load or high-speed operation occurs, the pressure in the upper inner shell increases, and the lubricating oil is pushed to the compensation hole, driving the first blocking plate to move along the track, driving the movable rod, compressing the second spring to store energy, and at the same time, the first blocking plate unlocks the outer tube body, and the lubricating oil flows in, relieving the internal pressure and dissipating heat. Its card connection design blocks the block and guides the oil to flow to the cavity through the gap, balancing the internal and external pressures, enhancing stability, and reducing deformation and wear. This mechanism promotes the circulation and renewal of the oil, takes away the heat of the main shaft, maintains a suitable working temperature, extends the life of the lubricating oil, and improves the durability of the bearing. Finally, the excess oil flows back to the oil storage tank to form a closed-loop lubrication and cooling system to ensure continuous supply and recycling, enhance heat dissipation, and comprehensively protect the main shaft and bearings.

[0020] 3. In the present invention, in the lubricating oil replenishing process, the mounting sleeve is driven by external force, and its linear motion is converted into precise sliding of the driving block in the driving groove through the slide groove, which drives the rotating sleeve to rotate, and the replenishing pipe rotates synchronously with the rotating sleeve. The replenishing hole on it is precisely aligned with the through hole of the bottom sleeve when it rotates to a specific position, forming a lubricating oil replenishing channel. This design ensures that the lubricating oil is accurately replenished to the inside of the bearing, while avoiding leakage during non-replenishment. Through the close cooperation between the driving groove and the driving block, the replenishing pipe can be accurately rotated 180 degrees to achieve the alignment of the replenishing hole and the through hole. After loosening the mounting sleeve, the first spring quickly resets each component to the initial state, ready for the next replenishment. This replenishing mechanism not only continuously provides lubricating oil to the bearing, reduces friction, wear and heat accumulation, but also balances the internal pressure of the upper inner shell, prevents structural deformation and unstable operation, and is crucial to improving bearing performance, extending life and ensuring stable operation of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic diagram of the overall structure of a fluid bearing device for a machine tool spindle according to the present invention;

[0022] Figure 2 It is a front view structural schematic diagram of a fluid bearing device for a machine tool spindle of the present invention;

[0023] Figure 3 It is a schematic diagram of the internal structure of a fluid bearing device for a machine tool spindle according to the present invention;

[0024] Figure 4 It is a schematic diagram of the internal structure of an upper housing of a fluid bearing device for a machine tool spindle according to the present invention;

[0025] Figure 5 It is a structural schematic diagram of a lower inner shell of a fluid bearing device for a machine tool spindle according to the present invention;

[0026] Figure 6 It is a structural schematic diagram of an upper inner shell of a fluid bearing device for a machine tool spindle according to the present invention;

[0027] Figure 7 It is a structural schematic diagram of a compensating member of a fluid bearing device for a machine tool spindle according to the present invention;

[0028] Figure 8 It is a cross-sectional structural schematic diagram of a fluid bearing device supplement for a machine tool spindle according to the present invention;

[0029] Fig. 9 The present invention is a schematic diagram of the disassembled structure of a supplementary component of a fluid bearing device for a machine tool spindle.

[0030] In the figure: 1, lower shell; 11, mounting hole; 12, cooling pipe; 13, oil storage tank; 14, cooling tank; 15, heat conduction plate; 2, upper shell; 21, cavity; 3, locking rod; 4, supplementary part; 41, mounting sleeve; 42, liquid inlet pipe; 43, rotating sleeve; 44, first spring; 45, fixed sleeve; 451, slide groove; 46, driving groove; 47, driving block; 48, bottom sleeve; 49, supplementary pipe; 491, supplementary hole; 5, upper inner shell; 51, compensation hole; 6, compensation part; 61, outer tube body; 62, inner tube body; 63, clamping block; 64, movable rod; 65, first blocking plate; 66, second blocking plate; 67, limiting plate; 68, second spring; 69, clamping groove; 7, lower inner shell; 71, flow limiting groove; 72, drainage groove; 73, sealing groove; 74, sealing ring; 8, ring body. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the implementation regulations described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] Example 1: Reference Figure 1 - Fig. 9 As shown: a fluid bearing device for a machine tool spindle comprises a lower shell 1 and an upper shell 2, wherein the lower shell 1 is fixedly connected to the upper shell 2, a lower inner shell 7 is installed on the inner side of the lower shell 1, a cavity 21 is provided at the top of the upper shell 2, an upper inner shell 5 is installed on the inner side of the cavity 21, an oil storage groove 13 is provided inside the lower shell 1, a plurality of cooling grooves 14 are provided at the bottom of the oil storage groove 13, a mounting hole 11 is provided at the bottom end of the lower shell 1, a limited flow groove 71 is provided at the middle part of the inner side of the lower inner shell 7, a plurality of drainage grooves 72 are provided on the outer surface of the limited flow groove 71, sealing grooves 73 are provided on the outer surfaces of both ends of the lower inner shell 7, a sealing ring 74 is installed inside the sealing groove 73, a compensation hole 51 is provided at the top of the upper inner shell 5, a compensation part 6 is installed inside the compensation hole 51, a locking rod 3 is fixedly connected to the center of the top of the upper shell 2, a supplementary part 4 is installed inside the locking rod 3;

[0033] The compensation member 6 includes an outer tube body 61, which is fixedly connected to the inside of the compensation hole 51. The inner wall of the outer tube body 61 is fixedly connected to the inner tube body 62. A clamping block 63 is fixedly connected to the inner wall of one end of the inner tube body 62. Clamping grooves 69 are provided on both sides of the clamping block 63. The inner wall of the inner tube body 62 is slidably connected to a limiting plate 67.

[0034] In this embodiment, the main shaft is installed between the lower inner shell 7 and the upper inner shell 5. Through its rotational movement, it can drive the ring body 8 to rotate synchronously, and then lead the lubricating oil stored in the oil storage tank 13 to the outer surface of the main shaft to form an oil film. During operation, the function of the flow limiting groove 71 is to regulate the flow of the fluid to optimize the load distribution inside the bearing and avoid eddy currents and vibration problems that may be caused by excessive fluid. At the same time, the drainage groove 72 works in conjunction with the flow limiting groove 71. By regulating the fluid flow rate, it not only improves the stability of the lower inner shell 7 and the upper inner shell 5, reduces the occurrence of high-frequency vibration, but also ensures the precise control of the oil film thickness and maintains it in the optimal state, thereby enhancing the load bearing capacity of the lower inner shell 7 and the upper inner shell 5.

[0035] In addition, the temperature inside the bearing is effectively controlled to prevent the adverse effects on the fluid lubrication performance caused by excessive temperature. The distribution pattern of the lubricating oil is also optimized to ensure that the lubricating oil can evenly cover all contact surfaces of the spindle, significantly improving the lubrication effect, extending the service life of the spindle, and reducing wear caused by friction.

[0036] Embodiment 2: Figure 7 As shown, a movable rod 64 is fixedly connected to the middle of one side of the limit plate 67, a first blocking plate 65 is fixedly connected to one end of the movable rod 64, and a second blocking plate 66 is fixedly connected to the outer surface of the middle of the movable rod 64. A second spring 68 is installed between one side of the limit plate 67 and the inner wall of the inner tube body 62, two clamping grooves 69 are clamped with the first blocking plate 65 and the second blocking plate 66 respectively, and one end of the first blocking plate 65 is clamped with one end of the outer tube body 61.

[0037] In this embodiment, facing the situation of high load or high-speed operation, the pressure inside the upper inner shell 5 may gradually accumulate and increase due to factors such as friction, sealing effect or changes in the external environment. As the internal pressure rises, the lubricating oil, as a medium for pressure transmission, is first pushed to the entrance of the compensation hole 51. The pressure is converted into power to push the first blocking plate 65 to move slowly along the preset track. In this process, the first blocking plate 65 also drives the synchronous movement of the movable rod 64. The displacement of the movable rod 64 further triggers the interaction with the limit plate 67, causing the second spring 68 to be gradually compressed, storing the potential energy generated by the pressure change.

[0038] At the same time, the movement of the first blocking plate 65 also unlocks one end of the outer tube body 61 that was originally blocked by it, opening up a new path for the flow of lubricating oil. The lubricating oil can flow smoothly into the outer tube body 61. This change not only alleviates the pressure accumulation inside the upper inner shell 5, but also realizes the effective transfer and dissipation of heat through the flow of oil. In particular, due to the clamping design between the first blocking plate 65 and the card slot 69, the block 63 is cleverly blocked, ensuring that the lubricating oil can flow to the cavity 21 area along the predetermined path, that is, the gap between the outer tube body 61 and the inner tube body 62. This design not only balances the internal and external pressure differences, but also optimizes the overall stability of the system and reduces the risk of mechanical deformation or wear caused by uneven pressure.

[0039] In addition, the compensation mechanism also promotes the circulation and renewal of lubricating oil within the system. Through the channel effect of the compensation hole 51, the heat generated during the rotation of the main shaft can be carried away by the fluid, which helps to maintain the main shaft and surrounding components within a suitable operating temperature range, thereby extending the service life of the lubricating oil and improving the durability and operating efficiency of the bearing. Even more cleverly, the excess lubricating oil will eventually flow back to the oil storage tank 13, forming a closed-loop lubrication and cooling system. This not only ensures the continuous supply and recycling of lubricating oil, but also further enhances the heat dissipation capacity of the system through the circulation of oil, and realizes comprehensive protection of the main shaft and bearing components.

[0040] Embodiment 3: According to Figure 2 , Figure 3 , Figure 8 and Fig. 9As shown, the supplementary member 4 includes a fixed sleeve 45 and a mounting sleeve 41. The mounting sleeve 41 is slidably connected to the fixed sleeve 45, and the outer diameter of the bottom end of the mounting sleeve 41 is smaller than the inner diameter of the top end of the fixed sleeve 45. The inner side of the mounting sleeve 41 is slidably connected to the liquid inlet pipe 42, and the fixed sleeve 45 is rotatably connected to the rotating sleeve 43. The outer wall of the rotating sleeve 43 is provided with a driving groove 46. The inner wall of the fixed sleeve 45 is provided with a sliding groove 451, and the sliding groove 451 is slidably connected to the driving block 47. The driving block 47 is fixedly connected to the bottom end of the mounting sleeve 41, and the driving block 47 is located inside the driving groove 46. The bottom end of the rotating sleeve 43 is fixedly connected to a supplementary pipe 49, and the supplementary pipe 49 is fixedly connected to the bottom end of the liquid inlet pipe 42. The bottom end of the supplementary pipe 49 is provided with a supplementary hole 491. The bottom of the fixed sleeve 45 is fixedly connected to a bottom sleeve 48, and a through hole on one side of the bottom sleeve 48 is connected to the supplementary hole 491. A first spring 44 is installed inside the rotating sleeve 43, the top end of the first spring 44 is located inside the mounting sleeve 41, and the first spring 44 is sleeved on the outer surface of the liquid inlet pipe 42. A ring body 8 is installed inside the upper shell 2, the bottom end of the ring body 8 is located inside the oil storage groove 13, and the top end of the mounting hole 11 is engaged with the cooling groove 14. A heat conducting plate 15 is installed inside the mounting hole 11, and a cooling pipe 12 is installed inside the heat conducting plate 15.

[0041] In this embodiment, during the process of replenishing lubricating oil, when the mounting sleeve 41 is pressed by external force, the linear motion of the mounting sleeve 41 is converted into the smooth sliding of the driving block 47 in the slide groove 451. This action not only ensures the stability of the movement, but also further promotes the precise displacement of the driving block 47 in the driving groove 46.

[0042] The interaction force between the driving groove 46 and the driving block 47 is cleverly transmitted to the rotating sleeve 43, causing it to rotate. As the rotating sleeve 43 rotates, the replenishing pipe 49, as the end execution component of this system, also rotates synchronously. The clever design of the replenishing pipe 49 lies in the replenishing hole 491 thereon. When this hole is rotated to a specific position, it will be precisely aligned with the through holes on both sides of the bottom sleeve 48, thereby establishing an unobstructed lubricating oil supply channel from the liquid inlet pipe 42 to the inside of the bearing. This not only ensures that the lubricating oil can be delivered to the destination accurately, but also avoids the problem of lubricating oil leakage in the non-replenishing state.

[0043] During the pressing process, the replenishing tube 49 can be accurately rotated 180 degrees through the delicate cooperation of the driving groove 46 and the driving block 47, ensuring that the replenishing hole 491 is completely aligned with the through hole. When the mounting sleeve 41 is released, the first spring 44, with its good elasticity, quickly resets the mounting sleeve 41 and its related components to the initial state, preparing for the next lubricating oil replenishing operation.

[0044] The realization of this supplementary function not only provides a continuous supply of lubricating oil support for the fluid bearing, ensuring the good lubrication state of the main shaft during long-term, high-load operation, and effectively reducing the wear and heat accumulation caused by friction; at the same time, it also helps to balance the pressure distribution inside the upper inner shell 5, preventing problems such as structural deformation or unstable operation caused by uneven pressure. This is of great significance for improving the overall performance of the fluid bearing, extending its service life, and ensuring the stable operation of the equipment.

[0045] The use method and working principle of this device: The main shaft is installed between the lower inner shell 7 and the upper inner shell 5. Through its rotation, it can synchronously drive the ring body 8 to rotate. In this process, the ring body 8 effectively transports the lubricating oil stored in the oil storage groove 13 to the outer surface of the main shaft to form a protective oil film. During the operation of the bearing, the flow limiting groove 71 accurately controls the flow of the fluid, thereby optimizing the load distribution in the bearing and effectively preventing eddy currents and vibrations caused by excessive fluid. At the same time, in synergy with the drainage groove 72, the flow limiting groove 71 not only limits the fluid flow rate, improves the stability of the bearing, reduces high-frequency vibrations, but also ensures the optimal control of the oil film thickness and improves the load-bearing capacity. In addition, this design also helps to manage the temperature inside the bearing, prevent the negative impact of high temperature on the lubrication performance of the fluid, and optimizes the distribution of the lubricating oil, ensuring uniform lubrication of the contact surfaces of the bearing, further reducing wear.

[0046] In the pressure compensation link, when the internal pressure of the upper inner shell 5 increases, the lubricating oil will naturally flow into the compensation hole 51, pushing the first blocking plate 65 and its attached movable rod 64 to move. In this process, the limit plate 67 is squeezed, so that the second spring 68 is compressed, and then the first blocking plate 65 is released from the blockage of one end of the outer tube body 61, allowing the lubricating oil to flow into the outer tube body 61. Due to the clamping design of the first blocking plate 65 and the card slot 69, the block 63 is effectively blocked, causing the excess lubricating oil to flow to the cavity 21 through the gap between the outer tube body 61 and the inner tube body 62, achieving a balance between the pressure difference between the inside and outside of the upper inner shell 5, reducing the risk of deformation or wear caused by uneven pressure, and maintaining the stable working state of the bearing. At the same time, this circulation mechanism also helps to maintain the fluidity and freshness of the lubricating oil, prevent poor lubrication caused by retention, and effectively remove the heat generated by the operation of the spindle through the compensation hole 51, reduce the operating temperature of the spindle, extend the service life of the lubricating oil, and improve the overall stability of the bearing.

[0047] As for the lubricating oil replenishment process, it can be achieved by pressing the installation sleeve 41. The movement of the installation sleeve 41 will drive the driving block 47 to slide in the slide groove 451 and the driving groove 46, and then exert a force on the rotating sleeve 43 to rotate it. During this rotation process, the installation sleeve 41 slides relative to the liquid inlet pipe 42 and compresses the first spring 44. As the rotating sleeve 43 rotates, the replenishing pipe 49 also rotates until the replenishing hole 491 on it is aligned with the through holes on both sides of the bottom sleeve 48, thereby opening the lubricating oil replenishment channel. New lubricating oil can be injected into the system through the liquid inlet pipe 42. During the pressing process, the precise matching of the driving groove 46 and the driving block 47 ensures that the replenishing pipe 49 can rotate 180 degrees. After releasing the installation sleeve 41, under the elastic force of the first spring 44, each component automatically resets to prepare for the next pressing replenishment operation. This replenishment mechanism ensures that the fluid bearing can continuously obtain sufficient lubricating oil supply during operation, reducing wear, and also helps to balance the internal pressure of the upper inner shell 5 and maintain the stable operation of the bearing.

[0048] When the lubricating oil flows into the oil storage tank 13, it will contact the heat conduction plate 15 inside the mounting hole 11. In addition, the use of multiple cooling tanks 14 can increase the contact area, thereby improving the cooling effect. Moreover, the use of cooling pipes 12 can further improve the cooling effect, which can help effectively dissipate the heat generated by mechanical parts during operation, reduce their operating temperature, and prevent overheating. By lowering the temperature, the cooling tank 14 can maintain the appropriate viscosity of the lubricating oil, improve the lubrication effect, thereby reducing wear and friction, and can also prevent thermal deformation during operation. The cooling tank 14 can help lower the temperature, reduce the risk of material deformation, and maintain the accuracy of the equipment.

[0049] Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A fluid bearing device for a machine tool spindle, comprising a lower housing (1) and an upper housing (2), wherein the lower housing (1) is fixedly connected to the upper housing (2), a lower inner housing (7) is installed inside the lower housing (1), a cavity (21) is formed at the top end of the upper housing (2), and an upper inner housing (5) is installed inside the cavity (21), characterized in that: An oil storage groove (13) is provided inside the lower shell (1), and a plurality of cooling grooves (14) are provided at the bottom of the oil storage groove (13). A mounting hole (11) is provided at the bottom end of the lower shell (1). A limiting flow groove (71) is provided at the middle of the inner side of the lower inner shell (7), and a plurality of drainage grooves (72) are provided on the outer surface of the limiting flow groove (71). Sealing grooves (73) are provided on the outer surfaces of both ends of the lower inner shell (7), and a sealing ring (74) is installed inside the sealing groove (73). A compensation hole (51) is provided at the top end of the upper inner shell (5), and a compensation component (6) is installed inside the compensation hole (51). A locking rod (3) is fixedly connected to the center of the top of the upper shell (2), and a supplementary component (4) is installed inside the locking rod (3); The compensating member (6) comprises an outer tube body (61), the outer tube body (61) is fixedly connected to the inside of the compensating hole (51), the inner wall of the outer tube body (61) is fixedly connected to the inner tube body (62), a clamping block (63) is fixedly connected to the inner wall of one end of the inner tube body (62), clamping grooves (69) are provided on both sides of the clamping block (63), and the inner wall of the inner tube body (62) is slidably connected to a limiting plate (67).

2. A fluid bearing device for a machine tool spindle according to claim 1, characterized in that: A movable rod (64) is fixedly connected to the middle of one side of the limiting plate (67), a first blocking plate (65) is fixedly connected to one end of the movable rod (64), and a second blocking plate (66) is fixedly connected to the outer surface of the middle of the movable rod (64).

3. A fluid bearing device for a machine tool spindle according to claim 2, characterized in that: A second spring (68) is installed between one side of the limiting plate (67) and the inner wall of the inner tube body (62); the two clamping grooves (69) are respectively clamped with the first blocking plate (65) and the second blocking plate (66); and one end of the first blocking plate (65) is clamped with one end of the outer tube body (61).

4. A fluid bearing device for a machine tool spindle according to claim 3, characterized in that: The supplementary member (4) comprises a fixed sleeve (45) and a mounting sleeve (41), wherein the mounting sleeve (41) is slidably connected to the fixed sleeve (45), and the outer diameter of the bottom end of the mounting sleeve (41) is smaller than the inner diameter of the top end of the fixed sleeve (45). A liquid inlet pipe (42) is slidably connected to the inner side of the mounting sleeve (41), and a rotating sleeve (43) is rotatably connected to the inside of the fixed sleeve (45), and a driving groove (46) is provided on the outer wall of the rotating sleeve (43).

5. A fluid bearing device for a machine tool spindle according to claim 4, characterized in that: The inner wall of the fixing sleeve (45) is provided with a sliding groove (451), and a driving block (47) is slidably connected inside the sliding groove (451). The driving block (47) is fixedly connected to the bottom end of the mounting sleeve (41), and the driving block (47) is located inside the driving groove (46).

6. A fluid bearing device for a machine tool spindle according to claim 5, characterized in that: The bottom end of the rotating sleeve (43) is fixedly connected to a supplementary pipe (49), the supplementary pipe (49) is fixedly connected to the bottom end of the liquid inlet pipe (42), and a supplementary hole (491) is opened at the bottom end of the supplementary pipe (49).

7. A fluid bearing device for a machine tool spindle according to claim 6, characterized in that: The bottom of the fixed sleeve (45) is fixedly connected to a bottom sleeve (48), and a through hole on one side of the bottom sleeve (48) is in communication with the supplementary hole (491).

8. A fluid bearing device for a machine tool spindle according to claim 7, characterized in that: A first spring (44) is installed inside the rotating sleeve (43), the top end of the first spring (44) is located inside the mounting sleeve (41), and the first spring (44) is sleeved on the outer surface of the liquid inlet pipe (42).

9. A fluid bearing device for a machine tool spindle according to claim 8, characterized in that: A ring body (8) is installed on the inner side of the upper shell (2), the bottom end of the ring body (8) is located inside the oil storage groove (13), and the top end of the installation hole (11) is embedded in the cooling groove (14).

10. A fluid bearing device for a machine tool spindle according to claim 8, characterized in that: A heat conducting plate (15) is installed inside the installation hole (11), and a cooling pipe (12) is installed inside the heat conducting plate (15).

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