Air dynamic pressure bearing with damping function and damping assembly thereof

Abstract

The application relates to the technical field of aerodynamic pressure bearings, in particular to an aerodynamic pressure bearing with a damping function and a damping assembly thereof, which solves the problem that when an aerodynamic pressure shaft starts rotating, the lower end of the surface of the aerodynamic pressure shaft and the lower end of the inner wall of the air bearing directly rub, the friction not only causes wear between the aerodynamic pressure shaft and the inner wall of the air bearing, but also produces generated vibration, which further causes instability in the rotating process and other problems. The application comprises an aerodynamic pressure shaft, air dynamic pressure bearings are movably arranged on the two sides of the aerodynamic pressure shaft, support plates are fixedly arranged at the lower ends of the two air dynamic pressure bearings, and air flow passing assemblies are fixedly connected to the two ends of the aerodynamic pressure shaft. Through the elasticity and bearing capacity of the bearing spring, if the overall rotating shaft part has great vibration, the vibration amount is transmitted to the bearing spring, and the vibration is buffered.

Description

Technical Field

[0001] This invention relates to the field of pneumatic bearing technology, specifically to a pneumatic bearing with damping function and its damping components. Background Technology

[0002] Air bearings, also known as air float bearings, are sliding bearings that use gas as a lubricant. The most common lubricant is air, but other gases such as nitrogen and argon can also be used as needed. Air bearings support the load by means of a pressurized air film formed between the sliding surfaces of the bearing. When they are working, the sliding surfaces are completely separated by the air film. Based on the different mechanisms of pressurized air film formation, air bearings are divided into two categories: air hydrodynamic bearings and air static bearings.

[0003] The pressure film of an air dynamic bearing is a wedge-shaped air film formed by the mutual movement of the sliding pairs, which brings air into the space between the surfaces of the sliding pairs. Since air dynamic bearings do not require an external air source, they are also called self-acting air bearings. The air bearing involved in this technical solution is an air dynamic bearing.

[0004] In existing pneumatic bearings and shafts, the lack of support causes the pneumatic shaft to fall downwards due to gravity, resulting in direct contact between the lower end of the pneumatic shaft surface and the lower end of the inner wall of the air bearing. This direct friction occurs at the start of rotation, causing wear and vibration between the pneumatic shaft and the inner wall of the air bearing, leading to instability during rotation. To address these issues, we propose a pneumatic bearing with vibration damping capabilities and its damping components. Summary of the Invention

[0005] The purpose of this invention is to provide an air dynamic pressure bearing with shock absorption function and its shock absorption component, so as to solve the problems mentioned in the background art, that when the air dynamic pressure shaft just starts to rotate, the lower end of the surface of the air dynamic pressure shaft and the lower end of the inner wall of the air bearing will directly rub against each other. This friction will not only cause wear between the air dynamic pressure shaft and the inner wall of the air bearing, but also generate vibration, which will lead to instability during rotation.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an air dynamic pressure bearing with shock absorption function, comprising an air dynamic pressure shaft, air dynamic pressure bearings movably disposed on both sides of the air dynamic pressure shaft, a support plate fixedly disposed at the lower end of the two air dynamic pressure bearings, and an air circulation component fixedly connected to both ends of the air dynamic pressure shaft;

[0007] The air dynamic pressure bearing includes two outer support parts fixed to the upper ends of both sides of the support plate, and a bearing part fixed in the middle of the two outer support parts. The bearing part has a hollow part in the middle, and multiple air holes are provided in the interior of the outer perimeter of the bearing part. The interior of the air holes is connected to the hollow part. The number of air holes is not less than eighteen.

[0008] The pneumatic pressure shaft includes a rotating shaft that rotates inside two bearing sections. The rotating shaft has a cavity inside and rotating bosses on both sides of the rotating shaft. A gap is formed between the rotating bosses and the hollow section in the middle of the bearing section.

[0009] The air circulation assembly includes two sleeves respectively fitted onto both ends of the rotating shaft. Connecting plates are fixedly connected to the upper and lower ends of one side of each sleeve. A connecting piece is connected to one side of each connecting plate. The connecting piece and the end face of the rotating shaft are fixedly connected by the connecting piece.

[0010] Preferably, multiple fan blades A are fixedly connected to all four sides of the outer surface of one sleeve, and multiple fan blades B are fixedly connected to all four sides of the outer surface of the other sleeve.

[0011] Preferably, the blades of fan blade A and fan blade B face opposite directions.

[0012] Preferably, a flange is fixedly connected to one end of the pneumatic pressure shaft, and a rotating device is provided on one side of the pneumatic pressure shaft. The pneumatic pressure shaft and the rotating shaft on the rotating device are fixedly connected by the flange.

[0013] Preferably, an electromagnetic speed sensor is fixedly installed at the middle of the upper end of the support plate.

[0014] A damping assembly for a pneumatic dynamic bearing with damping function includes a pneumatic dynamic bearing with damping function, which is located above a support plate. Connecting frames are fixedly connected to both sides of the support plate. Electric push columns are fixedly connected to the middle and both ends of the connecting frames. A bottom support block is connected to the output end of the electric push column, and a main damping component is fixedly connected to one end of the bottom support block.

[0015] Preferably, the bottom support block is configured as a trapezoidal platform structure.

[0016] Preferably, the main shock-absorbing component includes an upper support block fixed to one end face of the bottom support block. The upper support block has a movable cavity fixed inside, and a load-bearing spring is connected inside the movable cavity. The upper end of the load-bearing spring is connected to a movable frame. Two bushings are fixed on both sides of the movable frame. A short shaft is rotatably connected between the two bushings on both sides of the movable frame. A hard roller is rotatably fitted on the surface of the short shaft, and a soft roller is fixedly fitted on the surface of the hard roller.

[0017] Preferably, the cross-sectional area inside the movable cavity is larger than the area of ​​the lower end face of the movable frame, and the movable frame moves vertically within the movable cavity.

[0018] Preferably, the flexible roller is made of rubber material and contacts the surface of the rotating shaft.

[0019] Compared with the prior art, the beneficial effects of the present invention are:

[0020] This invention uses an electromagnetic speed sensor on the upper part of the support plate to detect the overall rotational speed of the pneumatic pressure shaft. The electromagnetic speed sensor is also connected to an external controller via wires. The controller contains a circuit board with a signal receiving module, a forward / reverse control module, and a signal transmitting module. When the electromagnetic speed sensor detects that the overall rotational speed of the pneumatic pressure shaft is less than r / min, it transmits this information to the signal receiving module on the circuit board. The signal receiving module converts this speed information into a forward rotation signal and transmits it to the forward / reverse control module. The forward / reverse control module transmits the signal to the servo motor on each electric push column through the signal transmitting module. This causes the servo motor on each electric push column to operate linearly, causing the output to drive the soft roller on the main shock absorber component to move closer to the surface of the rotating shaft. This operation supports the middle of the hollow part inside the bearing part of the overall pneumatic pressure shaft. This design prevents the lower ends of the rotating bosses on both sides of the rotating shaft from directly contacting the inner wall of the lower end of the hollow part at the beginning of rotation, thereby avoiding friction between the electromagnetic speed sensor and the hollow part at the beginning of rotation, and further avoiding vibration caused by friction.

[0021] In this invention, the cross-sectional area inside the movable cavity is set to be larger than the area of ​​the lower end face of the movable frame, so that the movable frame moves vertically within the movable cavity. At the same time, since the bearing spring has elasticity and bearing capacity, if the overall rotating shaft has a large vibration, its vibration will be transmitted to the bearing spring and buffer the vibration. The soft roller is made of rubber material and touches the surface of the rotating shaft. If the rotating shaft has a small vibration, the soft roller on the surface of the hard roller can buffer the small vibration. All of the above settings can improve the vibration damping performance of the damping component for the overall aerodynamic pressure shaft. Attached Figure Description

[0022] Figure 1 This is a three-dimensional structural diagram of the entire invention;

[0023] Figure 2 For the present invention Figure 1 Enlarged view of the 3D structure at point A;

[0024] Figure 3 In this invention Figure 2 Cross-sectional three-dimensional view of the structure;

[0025] Figure 4 This is a three-dimensional structural diagram of the electric push column and the main shock absorber component in this invention;

[0026] Figure 5 For the present invention Figure 4 Enlarged view of the 3D structure at point B;

[0027] Figure 6 This is a side sectional view of the main shock-absorbing component structure in this invention.

[0028] In the diagram: 1. Pneumatic pressure shaft; 101. Rotating shaft; 102. Rotating boss; 103. Cavity; 2. Support plate; 3. Pneumatic pressure bearing; 301. Outer support; 302. Hollow section; 303. Bearing section; 304. Vent; 4. Air circulation assembly; 401. Sleeve; 402. Connecting plate; 403. Connector; 5. Electric push column; 6. Main shock absorber; 601. Upper support block; 602. Flexible roller; 603. Movable cavity; 604. Load-bearing spring; 605. Movable frame; 606. Hard roller; 607. Short shaft; 608. Bushing; 7. Connecting frame; 8. Fan blade A; 9. Fan blade B; 10. Flange; 11. Bottom support block; 12. Electromagnetic speed sensor. Detailed Implementation

[0029] The technical solutions 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.

[0030] Please see Figures 1 to 6 An embodiment of the present invention provides: an air dynamic pressure bearing with shock absorption function, including an air dynamic pressure shaft 1, air dynamic pressure bearings 3 movably arranged on both sides of the air dynamic pressure shaft 1, a support plate 2 fixedly arranged at the lower end of the two air dynamic pressure bearings 3, and an air circulation component 4 fixedly connected to both ends of the air dynamic pressure shaft 1.

[0031] The air dynamic bearing 3 includes two outer support parts 301 fixed to the upper ends of both sides of the support plate 2. A bearing part 303 is fixedly provided in the middle of the two outer support parts 301. A hollow part 302 is provided in the middle of the bearing part 303. Multiple ventilation holes 304 are provided inside the outer periphery of the bearing part 303. The interior of the ventilation holes 304 is connected to the hollow part 302. The number of ventilation holes 304 is not less than eighteen. This arrangement ensures that at least four ventilation holes 304 are located at the lower end of the hollow part 302. Air can flow directly to the bottom of the hollow part 302 through these four ventilation holes 304, thus supporting the rotating boss part 102.

[0032] The pneumatic pressure shaft 1 includes a rotating shaft 101 that rotates inside two bearing portions 303. The rotating shaft 101 has a cavity 103 inside, which greatly reduces the weight of the overall pneumatic pressure shaft 1. Rotating bosses 102 are provided around both sides of the rotating shaft 101. A gap is formed between the rotating bosses 102 and the hollow portion 302 in the middle of the bearing portion 303. This gap allows air to circulate on both sides of the bearing portion 303. When the overall pneumatic pressure shaft 1 rotates at high speed, the air in the gap supports the rotating bosses 102, thereby supporting the overall rotating shaft 101.

[0033] The air circulation component 4 includes two sleeves 401 respectively fitted onto both ends of the rotating shaft 101. A connecting plate 402 is fixedly connected to the upper and lower ends of one side of each sleeve 401. A connecting piece 403 is connected to one side of the connecting plate 402. The connecting piece 403 and the end face of the rotating shaft 101 are fixedly connected through the connecting piece 403. This connection method allows the entire air circulation component 4 to be fixed on the end face of the pneumatic pressure shaft 1, and the entire air circulation component 4 can also be disassembled from the end face of the pneumatic pressure shaft 1.

[0034] A flange 10 is fixedly connected to one end of the pneumatic pressure shaft 1. A rotating device is provided on one side of the pneumatic pressure shaft 1. The pneumatic pressure shaft 1 and the rotating shaft on the rotating device are fixedly connected through the flange 10. An electromagnetic speed sensor 12 is fixedly provided at the middle of the upper end of the support plate 2. The electromagnetic speed sensor 12 can detect the rotation speed of the entire pneumatic pressure shaft 1.

[0035] When the overall air dynamic pressure bearing is used, one end of the rotating shaft 101 is first connected to the output shaft of the rotating device through the flange 10, so that the overall air dynamic pressure shaft 1 rotates. Alternatively, a rotor can be directly installed on the surface of the middle section of the rotating shaft 101, and a stator is installed around the rotor to form the main structure of the motor. The stator is energized to generate a magnetic field, which drives the rotor to rotate, thereby driving the overall air dynamic pressure shaft 1 to rotate.

[0036] The rotation of the overall rotating shaft 101 also drives the rotating bosses 102 on both sides to rotate. The rotating bosses 102 rotate in the hollow part 302 inside the bearing part 303, causing air to enter the gap between the bearing part 303 and the hollow part 302, thus forming a thin air film in the gap. As the rotating bosses 102 rotate in the thin air film, their outer wall is constantly subjected to the dynamic pressure generated by the relative movement of the air. Thus, the thin air film forms equal pressure on the outer wall of the rotating bosses 102 everywhere. The higher the rotation speed of the rotating bosses 102, the stronger the supporting effect of the thin air film.

[0037] This supporting air film is also called a pressure air film. The outer surface of the rotating boss 102 is subjected to a supporting force perpendicular to its wall surface, which eventually forms a resultant force. If this resultant force is less than the gravity, the shaft will fall in the direction of gravity, the lower end of the pressure air film will become thinner, the rigidity of the gas will increase, the pressure will increase, and the resultant force on the inner shaft will eventually be equal to the gravity. Therefore, as long as the inner shaft rotates at a certain speed, it can automatically maintain its height and be stably suspended under the support of the pressure air film in the pneumatic bearing, thus realizing the pneumatic bearing with air as a lubricant.

[0038] During the rotation of the pneumatic pressure shaft 1, multiple fan blades A8 are fixedly connected to all four sides of the outer surface of one sleeve 401, and multiple fan blades B9 are fixedly connected to all four sides of the outer surface of the other sleeve 401. This arrangement causes the pneumatic pressure shaft 1 to drive the fan blades A8 and B9 to rotate synchronously. Since the blades of fan blades A8 and B9 face opposite directions, the airflow generated by the rotation of fan blades A8 and B9 is directed towards the inward pneumatic pressure bearing 3. This causes air to enter the hollow part 30 through the vent 304 in the bearing part 303. Within 2, this allows air to enter the gap between the bearing part 303 and the rotating boss part 102 through the vent 304 and the hollow part 302. It also increases the air flow speed and further increases the pressure of the air film. This ensures that the air film formed in the bearing part 303 has enough force to lift the entire rotating shaft part 101 and prevent it from falling. At the same time, this setting utilizes the self-rotation power of the entire air dynamic pressure shaft 1 to drive the fan blades A8 and B9 to rotate. There is no need to install other external power devices for air flow, thereby saving some power energy and reducing energy consumption.

[0039] A damping assembly for a pneumatic bearing with damping function includes a pneumatic bearing with damping function, which is located above a support plate 2. Connecting frames 7 are fixedly connected to both sides of the support plate 2. Electric push columns 5 are fixedly connected to the middle and front and rear ends of the connecting frames 7. The setting of the two connecting frames 7 improves the support and fixation of the six electric push columns 5. A bottom support block 11 is connected to the output end of the electric push column 5. A main damping component 6 is fixedly connected to one end of the bottom support block 11. By setting the overall bottom support block 11 as a trapezoidal platform structure, this structure provides better fixation for the overall main damping component 6.

[0040] The electromagnetic speed sensor 12 on the upper end of the support plate 2 can detect the overall rotational speed of the pneumatic pressure shaft 1. The electromagnetic speed sensor 12 is also connected to an external controller via wires. The controller has a circuit board with a signal receiving module, a forward / reverse control module, and a signal transmitting module. When the electromagnetic speed sensor 12 detects that the overall rotational speed of the pneumatic pressure shaft 1 is less than 1500 r / min, the electromagnetic speed sensor 12 transmits this information to the signal receiving module on the circuit board. The signal receiving module converts this speed information into a forward rotation signal and transmits it to the forward / reverse control module. The forward / reverse control module then transmits the signal to each electric push column 5 through the signal transmitting module. The servo motors enable the output terminals of each electric push column 5 to operate linearly, causing the output terminals to drive the 660 on the main shock absorber 6 and the soft roller 602 to move closer to the surface of the rotating shaft 101. This operation supports the entire pneumatic pressure shaft 1 towards the middle of the hollow part 302 inside the bearing part 303. This arrangement prevents the lower ends of the rotating bosses 102 on both sides of the rotating shaft 101 from directly contacting the inner wall of the lower end of the hollow part 302 at the beginning of rotation, thereby avoiding friction between the electromagnetic speed sensor 12 and the hollow part 302 at the beginning of rotation, and further avoiding vibration caused by friction.

[0041] The main shock absorber 6 includes an upper support block 601 fixed to one end face of the bottom support block 11. The upper support block 601 has a movable cavity 603 fixed inside. A bearing spring 604 is connected inside the movable cavity 603. A movable frame 605 is connected to the upper end of the bearing spring 604. Two bushings 608 are fixed on both sides of the movable frame 605. A short shaft 607 is rotatably connected between the two bushings 608 located on both sides of the movable frame 605. A hard roller 606 is rotatably fitted on the surface of the short shaft 607. A soft roller 602 is fixedly fitted on the surface of the hard roller 606.

[0042] By setting the cross-sectional area inside the movable cavity 603 to be larger than the area of ​​the lower end face of the movable frame 605, the movable frame 605 can move vertically within the movable cavity 603. At the same time, since the bearing spring 604 has elasticity and bearing capacity, if the overall rotating shaft 101 has a large vibration, its vibration will be transmitted to the bearing spring 604 and the vibration will be buffered. The soft roller 602 is made of rubber material and touches the surface of the rotating shaft 101. If the rotating shaft 101 has a small vibration, the soft roller 602 on the surface of the hard roller 606 can buffer the small vibration. All of the above settings can improve the vibration damping performance of the damping components for the overall aerodynamic pressure shaft 1.

[0043] Finally, when the electromagnetic speed sensor 12 detects that the rotational speed of the overall pneumatic shaft 1 is greater than 1500 r / min, the electromagnetic speed sensor 12 transmits this information to the signal receiving module on the circuit board. The signal receiving module converts this speed information into a reverse signal and transmits it to the forward and reverse control module. The forward and reverse control module sends a signal to the servo motor on each electric push column 5 through the signal sending module. This causes the servo motor on each electric push column 5 to drive the output end to move in the opposite direction, and drive the main damping component 6 at one end to gradually move away from the pneumatic shaft 1. As a result, the hard roller 606 and soft roller 602 on the movable frame 605 in the main damping component 6 do not need to support the overall pneumatic shaft 1. The two ends of the pneumatic shaft 1 are only supported by the air inside the bearing part 303.

[0044] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A damping assembly for an air dynamic pressure bearing with damping function, comprising an air dynamic pressure bearing with damping function, the air dynamic pressure bearing comprising an air dynamic pressure shaft (1), characterized in that: Air dynamic bearings (3) are movably arranged on both sides of the air dynamic pressure shaft (1), and a support plate (2) is fixedly arranged at the lower end of the two air dynamic pressure bearings (3). An air circulation component (4) is fixedly connected to both ends of the air dynamic pressure shaft (1). The air dynamic pressure bearing (3) includes two outer support parts (301) fixed to the upper ends of both sides of the support plate (2). A bearing part (303) is fixedly provided in the middle of the two outer support parts (301). A hollow part (302) is provided in the middle of the bearing part (303). Multiple ventilation holes (304) are provided in the interior of the outer periphery of the bearing part (303). The interior of the ventilation holes (304) is connected to the hollow part (302). The number of ventilation holes (304) is not less than eighteen. The pneumatic pressure shaft (1) includes a rotating shaft (101) that rotates inside two bearing portions (303). The rotating shaft (101) has a cavity (103) inside. Rotating boss portions (102) are provided around both sides of the rotating shaft (101). A gap is formed between the rotating boss portion (102) and the hollow portion (302) in the middle of the bearing portion (303). The air circulation assembly (4) includes two sleeves (401) respectively fitted at both ends of the rotating shaft (101). Connecting plates (402) are fixedly connected to the upper and lower ends of one side of the sleeve (401). A connecting piece (403) is connected to one side of the connecting plate (402). The connecting piece (403) and the end face of the rotating shaft (101) are fixedly connected by the connecting piece (403). An air dynamic pressure bearing with shock absorption function is located above the support plate (2). A connecting frame (7) is fixedly connected to both sides of the support plate (2). An electric push column (5) is fixedly connected to the middle and the front and rear ends of the connecting frame (7). A bottom support block (11) is connected to the output end of the electric push column (5). A main shock absorption component (6) is fixedly connected to one end of the bottom support block (11). The main shock absorber (6) includes an upper support block (601) fixed to one end face of the bottom support block (11). The upper support block (601) has a movable cavity (603) fixed inside. A bearing spring (604) is connected inside the movable cavity (603). A movable frame (605) is connected to the upper end of the bearing spring (604). Two bushings (608) are fixed on both sides of the movable frame (605). A short shaft (607) is rotatably connected between the two bushings (608) on both sides of the movable frame (605). A hard roller (606) is rotatably fitted on the surface of the short shaft (607). A soft roller (602) is fixedly fitted on the surface of the hard roller (606).

2. The damping assembly of an air dynamic pressure bearing with damping function according to claim 1, characterized in that: Multiple fan blades A (8) are fixedly connected to the outer surface of one of the sleeves (401), and multiple fan blades B (9) are fixedly connected to the outer surface of the other sleeve (401).

3. The damping assembly of an air dynamic pressure bearing with damping function according to claim 2, characterized in that: The blades of fan blade A (8) and fan blade B (9) face opposite directions.

4. The damping assembly of an air dynamic pressure bearing with damping function according to claim 3, characterized in that: One end of the pneumatic pressure shaft (1) is fixedly connected to a flange (10), and a rotating device is provided on one side of the pneumatic pressure shaft (1). The pneumatic pressure shaft (1) and the rotating shaft on the rotating device are fixedly connected by the flange (10).

5. The damping assembly of an air dynamic pressure bearing with damping function according to claim 4, characterized in that: An electromagnetic speed sensor (12) is fixedly installed at the middle of the upper end of the support plate (2).

6. The damping assembly of an air dynamic pressure bearing with damping function according to claim 5, characterized in that: The bottom support block (11) is configured as a trapezoidal platform structure.

7. The damping assembly of an air dynamic pressure bearing with damping function according to claim 6, characterized in that: The flexible roller (602) is made of rubber material and touches the surface of the rotating shaft (101).

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