Short cylindrical part dynamic balance device supported by air bearing

Abstract

The invention discloses a short cylindrical part dynamic balancing device supported by an air bearing. Relates to the field of dynamic balancing devices of rigid parts. At present, due to the fact that a tool or single-face dynamic balance is used, a short cylindrical part still has a certain residual unbalance amount. The device comprises a base, a left support, a right support, a left air bearing, a right air bearing, a sensor, a pneumatic gear motor assembly and a workpiece driving pneumatic tire assembly. The left support and the right support are connected with the base, the left air bearing and the right air bearing are connected with the left support and the right support through conical surfaces respectively, and a workpiece is located between the concentric left air bearing and the concentric right air bearing. A pneumatic gear motor assembly arranged in the center of the short cylindrical part is fixedly connected with the right support, and after being ventilated, the pneumatic gear motor assembly can drive a workpiece to rotate through a pneumatic tire which expands outwards after being inflated; after the pneumatic tire is deflated and contracted to be separated from the workpiece, the workpiece keeps rotating freely under the support of the air bearing, and the dynamic unbalance amount can be determined through data measured by the sensor and a specific algorithm. The method is applied to the field of dynamic balance of rigid short cylindrical parts.

Description

Technical Field

[0001] The present invention relates to the field of dynamic balancing devices for rigid parts, and particularly to a dynamic balancing device for short cylindrical parts supported by air bearings. Background Art

[0002] For short cylindrical parts, the ratio of the length L to the outer diameter D is approximately L:D = 0.5 - 1.5. Generally, vertical single-plane dynamic balancing is adopted for such parts. Its obvious drawback is that due to single-plane dynamic balancing, there is still a certain residual unbalance in the parts. This residual unbalance may cause vibration of the parts under working conditions such as high-speed rotation. And the vibration will cause a series of problems, such as exacerbating the wear of the parts and reducing the service life of the parts. It may also affect the normal operation of other components cooperating with the part, generate noise, and even may reduce the running accuracy and reliability of the entire device.

[0003] If horizontal double-plane dynamic balancing is adopted, the short cylindrical part needs to be supported on the roller bracket of the dynamic balancing machine by a dynamic balancing tooling. The installation accuracy between the short cylindrical part and the dynamic balancing tooling, the self-dynamic balancing accuracy of the dynamic balancing tooling with a large mass, and the additional force of the coupling driving the dynamic balancing tooling to rotate seriously affect the true dynamic balancing accuracy of the short cylindrical part, which is very disadvantageous for high-speed rotating short cylindrical parts. Summary of the Invention

[0004] In order to reduce the influence of the traditional dynamic balancing method on the dynamic balancing accuracy of short cylindrical parts, the present invention provides a dynamic balancing device for short cylindrical parts supported by air bearings, which can effectively improve the dynamic balancing accuracy of short cylindrical parts.

[0005] The technical solution of the present invention is as follows:

[0006] A dynamic balancing device for short cylindrical parts supported by air bearings, the dynamic balancing device for short cylindrical parts supported by air bearings includes a base, a left support, a right support, a left air bearing, a right air bearing, a sensor, a pneumatic reduction motor assembly, and a workpiece driving air tire assembly;

[0007] The left support is fixedly connected above the base, and the right support is slidably connected above the base, so that the right support can move horizontally along the length direction of the base. The support shafts of the left support and the right support maintain a certain center height with the upper plane of the base. Among them, the central tapered hole on the left air bearing and the tapered surface of the support shaft of the left support form a tapered surface fit to realize the positioning of the left air bearing and the left support, and the central tapered hole of the right air bearing and the tapered surface of the support shaft of the right support form a tapered surface fit to realize the positioning of the right air bearing and the right support;

[0008] The pneumatic reduction motor assembly is fixedly connected to the right support. The rotor on the pneumatic reduction motor assembly is connected to the workpiece driving air tire assembly. After the pneumatic reduction motor assembly is ventilated, it can drive the workpiece driving air tire assembly to rotate.

[0009] The right air floating bearing is provided with multiple groups of circular arc air grooves at the outer diameter. A porous structure is inlaid at the outer diameter of the air grooves. When the air with pressure flows out from the multiple groups of circular arc air grooves through the porous structure, an air buoyancy force is generated at the outer diameter of the right air floating bearing. Among them, each radial circular arc air groove is connected to an external air supply device through an independent radial hole, axial hole, and pipe joint. By changing the air supply pressure of each channel, the radial force generated by each air groove can be adjusted.

[0010] Further, the circular arc air grooves on the outer diameter of the right air floating bearing include a radial A arc air groove, a radial B arc air groove, and a radial C arc air groove.

[0011] The radial A arc air groove is arranged in the range area of 90° - 150° of the outer diameter of the right air floating bearing. The radial B arc air groove is arranged in the range area of 150° - 180° of the outer diameter of the right air floating bearing. The radial C arc air groove is arranged in the range area of 180° - 210° of the outer diameter of the right air floating bearing.

[0012] A radial A arc porous support is inlaid at the outer diameter of the radial A arc air groove. A radial B arc porous support is inlaid at the outer diameter of the radial B arc air groove. A radial C arc porous support is inlaid at the outer diameter of the radial C arc air groove.

[0013] Corresponding radial arc air grooves are also made at the Y-axis symmetric parts of the radial A arc air groove, radial B arc air groove, and radial C arc air groove, and porous supports are inlaid at the radial arc air grooves.

[0014] The right air floating bearing is provided with exhaust grooves in the axial direction. The air exhaust grooves are distributed in the area of 10° - 330° of the end plane of the right air floating bearing.

[0015] Further, the right air floating bearing also includes sensors such as a 0° radial displacement probe, a 90° radial displacement probe, and a 180° radial displacement probe.

[0016] The 0° radial displacement probe, 90° radial displacement probe, and 180° radial displacement probe are respectively arranged at the 0°, 90°, and 180° outer diameter positions at the outer diameter of the right air floating bearing.

[0017] The 0° radial displacement probe, 90° radial displacement probe, and 180° radial displacement probe are non-contact eddy current induction probes. Through the 0° radial displacement probe, 90° radial displacement probe, and 180° radial displacement probe, the radial distance between the inner hole of the short cylindrical part and the probe can be measured.

[0018] Furthermore, the short cylindrical part includes a 0° phase reflective sticker, a 270° phase reflective sticker, and a 180° phase reflective sticker;

[0019] The 0° phase reflective sticker, 270° phase reflective sticker, and 180° phase reflective sticker are sequentially pasted on the outer circumference of the short cylindrical part at intervals of 90° counterclockwise. According to the coordinates of the right air bearing, a workpiece rotation speed and 0° phase probe are provided on the right side of the 0° phase reflective sticker, a workpiece rotation speed and 180° phase probe are provided on the left side of the 180° phase reflective sticker, and a workpiece rotation speed and 270° phase probe are provided directly below the 270° phase reflective sticker.

[0020] Furthermore, upper end face air grooves, lower end face air grooves, left end face air grooves, and right end face air grooves with an arc-shaped structure are distributed at the 90°, 270°, 180°, and 0° positions of the flange end face of the right air bearing facing the short cylindrical part;

[0021] The upper end face air groove, lower end face air groove, left end face air groove, and right end face air groove of the arc-shaped structure are connected to an external air supply device through independent radial holes, axial holes, and pipe joints. By changing the air supply pressure of each channel, the axial force generated by each end face air groove can be adjusted;

[0022] Furthermore, the pneumatic reduction motor assembly is rigidly connected to the right support, the pneumatic reduction motor assembly is concentric with the right air bearing, and the workpiece driving air tire assembly is rigidly installed on the rotating shaft of the pneumatic reduction motor assembly;

[0023] When the driving air tire assembly is inflated and the pneumatic reduction motor assembly is connected to high-pressure air, after the pneumatic reduction motor assembly is connected to high-pressure air, the driving air tire assembly drives the short cylindrical part to generate a rotational movement concentric with the left air bearing and the right air bearing.

[0024] Furthermore, the workpiece driving air tire assembly includes an air tire hub, an air tire, an air tire left splint, and an air tire right splint;

[0025] The air tire left splint and the air tire right splint clamp the air tire on the outer circumference of the air tire hub. The air tire is rigidly installed on the outer circumference of the air tire hub, and the inside of the air tire is connected to the air charging and discharging device through an air tire charging and discharging pipe, a rotating joint shaft vent hole, and an air tire hub vent hole.

[0026] Furthermore, the air tire includes an air tire outer layer, an air tire inner layer, and an air tire folding side;

[0027] The air tire outer layer is located on the outer circumference of the air tire, and the air tire inner layer is located on the inner circumference of the air tire;

[0028] The air tire folding side is located on both sides of the air tire, connecting the air tire outer layer and the air tire inner layer together.

[0029] Further, an air tire inflation and deflation hole is provided on the inner layer of the air tire;

[0030] When the air tire is inflated, the two folded sides of the air tire expand, causing the outer diameter of the outer layer of the air tire to increase;

[0031] When the air tire is deflated, the two folded sides of the air tire contract, causing the outer diameter of the outer layer of the air tire to decrease.

[0032] Further, the base is a flat cuboid frame, and the base is placed horizontally;

[0033] The left air floating bearing and the right support are of disc-shaped structures.

[0034] The present invention has the following effects compared with the prior art:

[0035] The present invention uses air floating bearings to support short cylindrical parts and uses an inflatable and deflatable air tire to drive the short cylindrical parts. After the air tire is deflated, the short cylindrical parts continue to rotate freely under the support of the floating bearings and are no longer affected by the driving additional force of the traditional dynamic balance method.

[0036] The present invention does not use a dynamic balance tooling that rotates synchronously with the short cylindrical parts, eliminates the influence of residual dynamic unbalance and installation errors of the dynamic balance tooling, can effectively improve the dynamic balance accuracy of the short cylindrical parts, and makes the short cylindrical parts after dynamic balance more suitable for high-speed occasions.

[0037] Compressed air with sufficient pressure in the present invention suspends and supports the short cylindrical parts through the left air floating bearing and the right air floating bearing. After the workpiece driving air tire assembly is inflated and contacts the inner wall of the short cylindrical parts, the pneumatic reduction motor assembly drives the workpiece driving air tire assembly and the short cylindrical parts to rotate at a high speed to the dynamic balance speed. Then the workpiece driving air tire assembly is deflated, and the workpiece driving air tire assembly disengages from the inner wall of the short cylindrical parts. Thus, the short cylindrical parts maintain high-speed free rotation on the left air floating bearing and the right air floating bearing with extremely small friction. The radial displacement probe measures the radial displacement of the short cylindrical parts caused by the dynamic unbalance force, and the phase probe measures the phase when the short cylindrical parts have the maximum and minimum radial displacements. The magnitude and phase of the unbalanced mass can be calculated according to a certain calculation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 is a schematic structural diagram of the present invention.

[0039] Figure 2 is a top view of the present invention.

[0040] Figure 3 is a cross-sectional view of the air floating bearing.

[0041] Figure 4 isFigure 2 Partial enlarged view of

[0042] Figure 5 is Figure 3 Partial enlarged view of

[0043] Figure 6 is Figure 2 Partial cross-sectional view of the air floating bearing in the middle

[0044] Figure 7 is the cross-sectional view of the pneumatic tire

[0045] Figure 8 is the partial cross-sectional view of the pneumatic tire in the longitudinal direction

[0046] 10. Short cylindrical part, 100. Base, 200. Left support, 300. Right support, 400. Left air floating bearing, 500. Right air floating bearing;

[0047] 510. Radial A-arc air groove, 512. Radial A-arc porous support, 520. Radial B-arc air groove, 522. Radial B-arc porous support, 530. Radial C-arc air groove, 532. Radial C-arc porous support, 550. Exhaust groove, 560. End face porous support, 562. Upper end face air groove, 564. Lower end face air groove, 570. Radial air groove air supply hole, 574. End face air groove air supply hole, 578. Pneumatic tire inflation and deflation hole, 582. Left end face air groove, 584. Right end face air groove;

[0048] 700. 0° radial displacement probe, 710. 90° radial displacement probe, 720. 180° radial displacement probe, 750. Workpiece rotation speed and 180° phase probe, 755. 180° phase reflective sticker, 760. Workpiece rotation speed and 270° phase probe, 765. 270° phase reflective sticker, 770. Workpiece rotation speed and 0° phase probe, 775. 0° phase reflective sticker;

[0049] 800. Pneumatic deceleration motor assembly;

[0050] 900. Workpiece driving pneumatic tire assembly, 910. Pneumatic tire hub, 920. Pneumatic tire, 922. Outer layer of pneumatic tire, 924. Folded side of pneumatic tire, 926. Inner layer of pneumatic tire, 928. Pneumatic tire inflation and deflation hole, 930. Pneumatic tire hub ventilation hole, 960. Left clamp of pneumatic tire, 962. Right clamp of pneumatic tire, 940. Rotating joint shaft ventilation hole, 950. Pneumatic tire inflation and deflation pipe; Detailed implementation manner

[0051] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments in conjunction with the accompanying drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0052] Specific implementation method 1: In combination with Figure 1 and Figure 2 describe this implementation method. A dynamic balancing device for a short cylindrical part supported by an air bearing consists of a base 100, a left support 200, a right support 300, a left air bearing 400, a right air bearing 500, a pneumatic reduction motor assembly 800, a workpiece driving air tire assembly 900, a 0° radial displacement probe 700, a 90° radial displacement probe 710, a 180° radial displacement probe 720, a workpiece rotation speed and 180° phase probe 750, a 180° phase reflective sticker 755, a workpiece rotation speed and 270° phase probe 760, a 270° phase reflective sticker 765, a workpiece rotation speed and 0° phase probe 770, a 0° phase reflective sticker 775, etc.

[0053] Among them, the base 100 is a steel frame in the shape of a flat cuboid. The base 100 is placed horizontally. The left support 200 is fixedly connected to the base 100. The right support 300 is slidably connected to the base 100. The right support 300 can move along the length direction of the base 100 and is fixed to the base after adjusting the distance from the left support 200.

[0054] The support shafts of the left support 200 and the right support 300 maintain a certain center height with the upper plane of the base 100. The central tapered hole of the disc-shaped left air bearing 400 and the tapered surface of the support shaft of the left support 200 form a tapered surface fit to achieve precise positioning of the left air bearing 400 and the left support 200. The central tapered hole of the disc-shaped right air bearing 500 and the tapered surface of the support shaft of the right support 300 form a tapered surface fit to achieve precise positioning of the right air bearing 500 and the right support 300.

[0055] By moving the right support 300, the short cylindrical part 10 can be accurately installed between the left air bearing 400 and the right air bearing 500.

[0056] After completing dynamic balancing, by moving the right support 300, the short cylindrical part 10 can be removed.

[0057] The pneumatic reduction motor assembly 800 is fixedly connected to the right support 300. The workpiece driving air tire assembly 900 is connected to the rotor of the pneumatic reduction motor assembly 800. After the pneumatic reduction motor assembly 800 is ventilated, it can drive the workpiece driving air tire assembly 900 to rotate.

[0058] Specific implementation method 2: In combination with Figure 3 — Figure 5To describe this embodiment, a dynamic balancing device for a short cylindrical part supported by an air bearing. The disk-shaped right air bearing 500 has multiple sets of circular arc air grooves at its outer diameter. Porous materials are inlaid at the outer diameter of the air grooves. When air at a certain pressure flows out of the air grooves through the porous materials, an air buoyancy force is generated at the outer diameter of the right air bearing 500.

[0059] Each radial circular arc air groove is connected to an external air supply device through independent radial holes, axial holes, and pipe joints. By changing the air supply pressure of each channel, the radial force generated by each air groove can be adjusted.

[0060] On the outer diameter of the disk-shaped right air bearing 500, the radial A-arc air groove 510 is distributed in the range of 90° - 150°, the radial B-arc air groove 520 is distributed in the range of 150° - 180°, and the radial C-arc air groove 530 is in the range of 180° - 210°.

[0061] The radial A-arc porous support 512 is inlaid at the outer diameter of the radial A-arc air groove 510. The radial B-arc porous support 522 is inlaid at the outer diameter of the radial B-arc air groove 520. The radial C-arc porous support 532 is inlaid at the outer diameter of the radial C-arc air groove 530.

[0062] At the parts of the radial A-arc air groove, radial B-arc air groove, and radial C-arc air groove that are symmetric with the y-axis, corresponding radial arc air grooves are also made and porous supports are also inlaid.

[0063] The exhaust groove 550 is axially opened and distributed in the range of 10° - 330° on the end plane of the disk-shaped right air bearing 500.

[0064] Specific Embodiment 3: Combining Figure 3 — Figure 5 To describe this embodiment, a dynamic balancing device for a short cylindrical part supported by an air bearing. At the positions of 0°, 90°, and 180° on the outer diameter of the disk-shaped right air bearing 500, a 0° radial displacement probe 700, a 90° radial displacement probe 710, and a 180° radial displacement probe 720 are respectively installed. Each radial displacement probe is a non-contact eddy current induction probe, which can measure the radial distance between the inner hole of the short cylindrical part 10 and the probe.

[0065] On the outer circumference of the short cylindrical part 10, 0° phase reflective stickers 775, 270° phase reflective stickers 765, and 180° phase reflective stickers 755 are sequentially pasted counterclockwise at intervals of 90°.

[0066] According to the coordinates of the disk-shaped right air bearing 500, the workpiece rotation speed and the 180° phase probe 750 are arranged on the left side, the workpiece rotation speed and the 0° phase probe 770 are arranged on the right side, and the workpiece rotation speed and the 270° phase probe 760 are arranged directly below.

[0067] Specific Embodiment 4: Combined with Figure 3 — Figure 5 In this embodiment, a dynamic balancing device for a short cylindrical part supported by air bearings is described. The arc-shaped upper-end face air groove 562, lower-end face air groove 564, left-end face air groove 582, and right-end face air groove 584 are distributed at the 90°, 270°, 180°, and 0° positions on the flange end face of the disc-shaped right air bearing 500 facing the short cylindrical part 10.

[0068] Each end-face arc-shaped air groove is connected to an external air supply device through independent radial holes, axial holes, and pipe joints. By changing the air supply pressure of each channel, the axial force generated by each end-face air groove can be adjusted.

[0069] Similarly, the disc-shaped left air bearing 400 and the right air bearing 500 have exactly the same radial air grooves, end-face air grooves, radial multi-hole supports, and end-face multi-hole supports.

[0070] Specific Embodiment 5: Combined with Figure 4 — Figure 6 In this embodiment, a dynamic balancing device for a short cylindrical part supported by air bearings is described. The pneumatic reduction motor assembly 800 is rigidly connected to the right support 300 and is concentric with the right air bearing 500. The workpiece driving air tire assembly 900 is rigidly installed on the rotating shaft of the pneumatic reduction motor assembly 800. The air tire 920 is rigidly installed on the outer circumference of the air tire hub 910. The air tire air charging and discharging pipe 950, the rotary joint shaft ventilation hole 940, and the air tire hub ventilation hole 930 connect the inside of the air tire 920 with the air charging and discharging device. When inflated, the outer edge of the air tire 920 contacts the inner hole of the short cylindrical part 10 to generate a positive pressure. When deflated, the outer edge of the air tire 920 disengages from the inner hole of the short cylindrical part 10. When the air tire 920 is inflated and the pneumatic reduction motor assembly 800 is connected to high-pressure air, the driving air tire assembly 900 drives the short cylindrical part 10 to perform a rotational motion concentric with the left air bearing 400 and the right air bearing 500.

[0071] Specific Embodiment 6: Combined with Figure 6 In this embodiment, a dynamic balancing device for a short cylindrical part supported by air bearings is described. The right side of the short cylindrical part 10 is supported on the right air bearing 500, and the radial B-arc multi-hole support 522 and the end-face multi-hole support 560 of the right air bearing 500 provide radial force and axial force.

[0072] The radial B-arc multi-hole support 522 is embedded on the outer circle of the radial B-arc air groove 520. The radial air groove air supply hole 570 supplies air with sufficient pressure to the radial B-arc air groove 520, and the air flows out evenly through the pores of the radial B-arc multi-hole support 522 to generate a radial supporting force.

[0073] Similarly, the air supply hole 574 of the end face air groove supplies air with sufficient pressure to the end face air groove 562, and the air flow uniformly flows out through the pores of the end face porous support 560 to generate an axial support force.

[0074] Similarly, the radial porous support and the end face porous support at other positions on the right air floating bearing 500 also generate radial and axial support forces. Similarly, the left side of the short cylindrical part 10 is supported on the left air floating bearing 400, and the radial support and the end face porous support of the left air floating bearing 400 provide radial force and axial force.

[0075] Specific Embodiment Seven: Combining Figure 7 and Figure 8 to illustrate this embodiment, a dynamic balancing device for a short cylindrical part supported by an air floating bearing according to this embodiment. The workpiece driving air tire assembly 900 is composed of an air tire hub 910, an air tire 920, an air tire left clamping plate 960, and an air tire right clamping plate 962. The air tire left clamping plate 960 and the air tire right clamping plate 962 clamp the air tire 920 on the outer circumference of the air tire hub 910.

[0076] The air tire 920 with a hollow rectangular cross-section includes an air tire outer layer 922 with a larger wall thickness, an air tire inner layer 926, and air tire folding sides 924 with a smaller wall thickness. The air tire outer layer 922 is located on the outer circumference of the air tire 920, and the air tire inner layer 926 is located on the inner circumference of the air tire 920.

[0077] The air tire folding sides 924 are located on two sides of the air tire 920 and connect the air tire outer layer 922 and the air tire inner layer 926 together.

[0078] An air tire inflation and deflation hole 928 is formed on the air tire inner layer 926.

[0079] When the air tire 920 is inflated, the two air tire folding sides 924 expand, causing the outer diameter of the air tire outer layer 922 to become larger.

[0080] When the air tire 920 is deflated, the two air tire folding sides 924 contract, causing the outer diameter of the air tire outer layer 922 to become smaller.

[0081] Specific Embodiment Eight: Combining Figure 7 and Figure 8 to illustrate this embodiment, a dynamic balancing device for a short cylindrical part supported by an air floating bearing according to this embodiment

[0082] The process of dynamic balancing is as follows: The short cylindrical part 10 is installed between the left air floating bearing 400 and the right air floating bearing 500; the left air floating bearing 400 and the right air floating bearing 500 are connected to compressed air, and the short cylindrical part 10 floats up under the action of air buoyancy to overcome gravity; the air tire 920 is inflated; after the pneumatic reduction motor assembly 800 is connected to compressed air, it drives the short cylindrical part 10 to rotate at an accelerated speed; the air tire 920 is deflated;

[0083] The workpiece continues to rotate freely; the vibration measuring probe measures the vibration displacement of the workpiece; the dynamic balance weight removal position and mass are calculated according to a specific algorithm.

[0084] Specific Embodiment Nine: Combine Figure 1 — Figure 8 To illustrate this embodiment, the process of dynamic balancing of a short cylindrical part 10 supported by air bearings using this invention patent is as follows:

[0085] The central conical hole on the left air bearing 400 and the supporting shaft conical surface of the left support 200 form a conical surface fit to realize the positioning of the left air bearing 400 and the left support 200. The central conical hole of the right air bearing 500 and the supporting shaft conical surface of the right support 300 form a conical surface fit to realize the positioning of the right air bearing 500 and the right support 300. The short cylindrical part 10 is installed between the left air bearing 400 and the right air bearing 500. The left air bearing 400 and the right air bearing 500 are connected to compressed air. Compressed air with sufficient pressure passes through the left air bearing 400 and the right air bearing 500 to suspend and support the short cylindrical part 10, so that the short cylindrical part 10 floats up under the action of air buoyancy to overcome gravity. After the pneumatic reduction motor assembly 800 is connected to high-pressure air, the air tire 920 of the workpiece driving air tire assembly 900 is inflated, and the two folded sides 924 of the air tire are expanded, causing the outer diameter of the air tire outer layer 922 to become larger and contact the inner wall of the short cylindrical part 10.

[0086] The driving air tire assembly 900 drives the short cylindrical part 10 to perform a rotational motion concentric with the left air bearing 400 and the right air bearing 500. After the pneumatic reduction motor assembly 800 drives the workpiece driving air tire assembly 900 and the short cylindrical part 10 to rotate at a high speed to the dynamic balance speed, the air tire 920 of the workpiece driving air tire assembly 900 is deflated, and the two folded sides 924 of the air tire are contracted, causing the outer diameter of the air tire outer layer 922 to become smaller. The outer edge of the air tire 920 is disengaged from the inner hole of the short cylindrical part 10. Thus, the short cylindrical part 10 maintains a high-speed free rotation on the left air bearing 400 and the right air bearing 500 with extremely small friction. The radial displacement probe measures the radial displacement of the workpiece 10 caused by the dynamic unbalance force, and the phase probe measures the phase when the workpiece 10 has the maximum and minimum radial displacements. The magnitude and phase of the unbalanced mass can be calculated according to a certain calculation method.

[0087] Specific Embodiment Ten: Combine Figure 1 — Figure 8 To illustrate this embodiment, a dynamic balancing device for a short cylindrical part supported by air bearings in this embodiment

[0088] The basic principle of measuring the dynamic balance weight removal mass and phase angle using this invention patent is:

[0089] Forces acting on the workpiece: gravitational force G and centrifugal force F generated by the eccentric mass;

[0090] The centrifugal force vector of the eccentric mass is superimposed with the gravitational force vector according to the rotation angle, generating a resultant force. The resultant force interacts with the air buoyancy force, causing the workpiece to have a radial displacement.

[0091] The resultant force in the horizontal direction Fx = Fcos(a);

[0092] The resultant force in the vertical direction Fy = G - Fsin(a);

[0093] When the eccentric mass is at the highest point vertically upward, a = 90°, and the force on the workpiece in the vertical direction is the smallest, K2 = G - F;

[0094] When the eccentric mass is at the lowest point vertically upward, a = 270°, and the force on the workpiece in the vertical direction is the largest, K4 = G + F;

[0095] When the eccentric mass is on the positive X-axis, a = 0°, and the force on the workpiece in the vertical direction K1 = G;

[0096] The force in the horizontal direction U1 = F;

[0097] When the eccentric mass is on the negative X-axis, a = 180°, the force on the workpiece in the vertical direction K1 = G, and the force in the horizontal direction U1 = -F. Therefore, let the stiffness of the air bearing be K;

[0098] When the workpiece does not rotate, the supporting force of the pneumatic bearing is balanced with the gravitational force G of the workpiece. When the workpiece rotates, when the eccentric mass is at the highest point vertically upward, a = 90°, the force on the workpiece in the vertical direction is the smallest, and the workpiece has an upward displacement X1 = F / K;

[0099] When the eccentric mass is at the lowest point vertically upward, a = 270°, the force on the workpiece in the vertical direction is the largest, and the workpiece has a downward displacement X2 = -F / K. Use a displacement probe to measure the moment t1 when the maximum displacement occurs. According to the number of times the reflected light cursor appears per minute, the rotational speed n (r / s) of the workpiece can be measured. Denote the moment of the reflected light cursor before the maximum displacement of the workpiece appears as t0, then the phase angle between the unbalanced mass and the reflected light cursor is b = 360°*(t1 - t0)*n;

[0100] The mass to be removed m = X1*K / r*(npi / 30)^2, that is: m = 900*X1*K / r*(n*pi)^2, where r is the radius of mass removal.

[0101] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to obtain equivalent embodiments with equivalent changes within the scope of the technical solution of the present invention. However, as long as it does not depart from the content of the technical solution of the present invention and is based on the technical essence of the present invention, any simple modification, equivalent replacement, and improvement made to the above embodiments still fall within the protection scope of the technical solution of the present invention.

Claims

1. A dynamic balancing device for a short cylindrical part supported by an air bearing, characterized in that, The dynamic balancing device for a short cylindrical part supported by an air bearing includes a base (100), a left support (200), a right support (300), a left air bearing (400), a right air bearing (500), a pneumatic reduction motor assembly (800), and a workpiece driving air tire assembly (900). The left support (200) is fixedly connected above the base (100), and the right support (300) is slidably connected above the base (100), enabling the right support (300) to move horizontally along the length direction of the base (100). The support shafts of the left support (200) and the right support (300) maintain a certain center height with respect to the upper plane of the base (100). Among them, the center conical hole on the left air bearing (400) and the conical surface of the support shaft of the left support (200) form a conical surface fit to achieve the positioning of the left air bearing (400) and the left support (200). The center conical hole of the right air bearing (500) and the conical surface of the support shaft of the right support (300) form a conical surface fit to achieve the positioning of the right air bearing (500) and the right support (300). The pneumatic reduction motor assembly (800) is fixedly connected to the right support (300). The rotor on the pneumatic reduction motor assembly (800) is connected to the workpiece driving air tire assembly (900). After the pneumatic reduction motor assembly (800) is ventilated, it can drive the workpiece driving air tire assembly (900) to rotate. The right air bearing (500) is provided with multiple groups of circular arc-shaped air grooves at the outer diameter. A porous structure is inlaid at the outer diameter of the air grooves. When air with pressure flows out from the multiple groups of circular arc-shaped air grooves through the porous structure, an air buoyancy force is generated at the outer diameter of the right air bearing (500). Among them, each radial circular arc-shaped air groove is connected to an external air supply device through an independent radial hole, axial hole, and pipe joint. By changing the air supply pressure of each channel, the radial force generated by each air groove can be adjusted.

2. The dynamic balancing device for a short cylindrical part supported by an air bearing according to claim 1, wherein, The circular arc-shaped air grooves on the outer diameter of the right air bearing (500) include a radial A-arc air groove (510), a radial B-arc air groove (520), and a radial C-arc air groove (530). The radial A-arc air groove (510) is arranged in the range of 90° - 150° of the outer diameter of the right air bearing (500), the radial B-arc air groove (520) is arranged in the range of 150° - 180° of the outer diameter of the right air bearing (500), and the radial C-arc air groove (530) is arranged in the range of 180° - 210° of the outer diameter of the right air bearing (500). A radial A-arc porous support (512) is inlaid at the outer diameter of the radial A-arc air groove (510), a radial B-arc porous support (522) is inlaid at the outer diameter of the radial B-arc air groove (520), and a radial C-arc porous support (532) is inlaid at the outer diameter of the radial C-arc air groove (530). Corresponding radial arc-shaped air grooves are also made at the Y-axis symmetric parts of the radial A-arc air groove (510), the radial B-arc air groove (520), and the radial C-arc air groove (530), and porous supports are inlaid at the radial arc-shaped air grooves. The right air-bearing (500) is axially provided with an exhaust groove (550), and the air exhaust groove (550) is distributed in the area of 10° - 330° of the end plane of the right air-bearing (500).

3. The dynamic balancing device for a short cylindrical part supported by an air floating bearing according to claim 2, characterized in that, The right air-bearing (500) further includes a 0° radial displacement probe (700), a 90° radial displacement probe (710) and a 180° radial displacement probe (720); The 0° radial displacement probe (700), 90° radial displacement probe (710) and 180° radial displacement probe (720) are respectively arranged at the 0°, 90° and 180° outer diameter positions of the outer diameter of the right air-bearing (500); The 0° radial displacement probe (700), 90° radial displacement probe (710) and 180° radial displacement probe (720) are non-contact eddy current induction probes, and the radial distance between the inner hole of the short cylindrical part (10) and the probe can be measured through the 0° radial displacement probe (700), 90° radial displacement probe (710) and 180° radial displacement probe (720).

4. The dynamic balancing device for a short cylindrical part supported by an air bearing according to claim 3, characterized in that, The short cylindrical part (10) includes a 0° phase reflective sticker (775), a 270° phase reflective sticker (765) and a 180° phase reflective sticker (755); The 0° phase reflective sticker (775), 270° phase reflective sticker (765) and 180° phase reflective sticker (755) are sequentially pasted on the outer circumference of the short cylindrical part (10) at intervals of 90° counterclockwise. According to the coordinates of the right air-bearing (500), a workpiece rotation speed and 0° phase probe (770) is arranged on the right side of the 0° phase reflective sticker (775), a workpiece rotation speed and 180° phase probe (750) is arranged on the left side of the 180° phase reflective sticker (755), and a workpiece rotation speed and 270° phase probe (760) is arranged directly below the 270° phase reflective sticker (765).

5. The dynamic balancing device for a short cylindrical part supported by an air bearing according to claim 3, wherein, At the 90°, 270°, 180° and 0° positions of the flange end face of the right air-bearing (500) facing the short cylindrical part (10), there are an upper end face air groove (562), a lower end face air groove (564), a left end face air groove (582) and a right end face air groove (584) with an arc-shaped structure; The upper end face air groove (562), lower end face air groove (564), left end face air groove (582) and right end face air groove (584) with an arc-shaped structure are connected to an external air supply device through independent radial holes, axial holes and pipe joints. By changing the air supply pressure of each channel, the axial force generated by each end face air groove can be adjusted.

6. The dynamic balancing device for a short cylindrical part supported by an air bearing according to claim 1, characterized in that, The pneumatic reduction motor assembly (800) is rigidly connected to the right support (300), and the pneumatic reduction motor assembly (800) is concentric with the right air-bearing (500). The workpiece driving air tire assembly (900) is rigidly installed on the rotating shaft of the pneumatic reduction motor assembly (800); When the driving pneumatic tire assembly (900) is inflated, after the pneumatic reduction motor assembly (800) is connected to high-pressure air, the driving pneumatic tire assembly (900) drives the short cylindrical part (10) to generate a rotational motion concentric with the left air bearing (400) and the right air bearing (500).

7. The dynamic balancing device for a short cylindrical part supported by an air bearing according to claim 6, characterized in that, The workpiece driving pneumatic tire assembly (900) includes a pneumatic tire hub (910), a pneumatic tire (920), a pneumatic tire left clamping plate (960) and a pneumatic tire right clamping plate (962); The pneumatic tire left clamping plate (960) and the pneumatic tire right clamping plate (962) clamp the pneumatic tire (920) on the outer circumference of the pneumatic tire hub (910). The pneumatic tire (920) is rigidly installed on the outer circumference of the pneumatic tire hub (910), and the inside of the pneumatic tire (920) is communicated with the air charging and discharging device through the pneumatic tire air charging and discharging pipe (950), the rotary joint shaft vent hole (940) and the pneumatic tire hub vent hole (930).

8. The dynamic balancing device for a short cylindrical part supported by an air bearing according to claim 7, characterized in that, The pneumatic tire (920) includes a pneumatic tire outer layer (922), a pneumatic tire inner layer (926) and a pneumatic tire folding side (924); The pneumatic tire outer layer (922) is located on the outer circumference of the pneumatic tire (920), and the pneumatic tire inner layer (926) is located on the inner circumference of the pneumatic tire (920); The pneumatic tire folding side (924) is located on both sides of the pneumatic tire (920) and connects the pneumatic tire outer layer (922) and the pneumatic tire inner layer (926).

9. The dynamic balancing device for a short cylindrical part supported by an air floating bearing according to claim 8, characterized in that, The pneumatic tire inner layer (926) is provided with a pneumatic tire air charging and discharging hole (928); When the pneumatic tire (920) is inflated, the two pneumatic tire folding sides (924) expand, causing the outer diameter of the pneumatic tire outer layer (922) to increase; When the pneumatic tire (920) is deflated, the two pneumatic tire folding sides (924) contract, causing the outer diameter of the pneumatic tire outer layer (922) to decrease.

10. The dynamic balancing device for a short cylindrical part supported by an air bearing according to claim 1, characterized in that, The base (100) is a flat cuboid frame and is placed horizontally; The left air bearing (400) and the right support (300) are disc-shaped structures.

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