Slewing bearing with built-in air drive

Abstract

The utility model relates to a slewing bearing with a built-in air drive, which belongs to the technical field of slewing bearings and comprises a slewing bearing stator and a slewing bearing rotor. The slewing bearing stator is a slewing bearing outer ring, and an air inlet and an air outlet are formed in the slewing bearing outer ring; the slewing bearing rotor comprises a slewing bearing inner ring, an inner ring rotor, blades and an end cover, the slewing bearing inner ring is arranged in the slewing bearing outer ring, a rolling body is arranged between the slewing bearing inner ring and the slewing bearing outer ring, the lower end of the slewing bearing inner ring is connected with the inner ring rotor, a plurality of blades are uniformly distributed on the outer circumference of the inner ring rotor, and the end cover is connected with the inner ring rotor. One end of the inner ring rotor is connected with an end cover, a working cavity is formed among the end cover, the slewing bearing outer ring and the inner ring rotor, the blades are located in the working cavity, and the air inlet and the air outlet are communicated with the working cavity; according to the utility model, an air driving mode is adopted to replace a gear transmission mode or a worm gear transmission mode, and the air compressor has the advantages of compact structure, high transmission power, high air tightness, high reliability and adjustable rotating speed.

Description

Technical Field

[0001] The utility model relates to a slewing support, in particular to a slewing support with built-in air drive, and belongs to the technical field of slewing supports. Background Art

[0002] As an important basic component of engineering machinery and construction machinery, slewing bearings are essential force transmission components for any machine that needs to rotate relative to each other and withstand axial force, radial force, and overturning moment. With the development of the industry, in addition to various engineering machinery, the application scope of slewing bearings has been gradually expanding. Slewing bearings have been widely used in many industries and fields, including sewage treatment, marine development, oil exploration, medicine and health, food industry, chemical industry, light textile industry, filling equipment, electric power, scientific research, national defense and military technology, etc., to replace original bearings. Various working environments have also put forward higher requirements for the load-bearing, transmission performance, and structure of slewing bearings.

[0003] Traditional slewing bearings mostly use gear pairs or worm gear pairs for transmission, which have low transmission efficiency, cannot output high speed, high power and high torque, and cannot freely adjust the speed and torque output. Their safety and reliability are not high enough.

[0004] Therefore, developing a slewing bearing that can overcome the above defects has become a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to overcome the shortcomings of the existing technology and provide a slewing bearing with a built-in air drive, which adopts an air drive mode to replace the gear drive or worm gear drive, and has the advantages of compact structure, high transmission power, high air tightness, high reliability and adjustable speed.

[0006] In order to solve the above technical problems, the utility model provides a slewing bearing with a built-in air drive, comprising a slewing bearing stator and a slewing bearing rotor arranged in the slewing bearing stator;

[0007] The slewing bearing stator is the outer ring of the slewing bearing, and the outer ring of the slewing bearing is provided with an air inlet and an air outlet;

[0008] The slewing bearing rotor includes a slewing bearing inner ring, an inner ring rotor, blades, and an end cover. The slewing bearing inner ring is arranged inside the slewing bearing outer ring. Rolling bodies are provided between the slewing bearing inner ring and the slewing bearing outer ring to achieve mutual rotation. The lower end of the slewing bearing inner ring is connected to the inner ring rotor via bolts. Several radial slots are evenly distributed on the outer circumference of the inner ring rotor. Blades are provided in the radial slots. The end of the inner ring rotor away from the slewing bearing inner ring is connected to the end cover via bolts. A sealed working chamber is formed between the end cover, the slewing bearing outer ring, and the inner ring rotor. The blades are located in the working chamber, and the air inlet and outlet are connected to the working chamber.

[0009] The gas enters the working chamber from the air inlet to increase the air pressure. The air pressure acts on the blades to make them rotate, thereby driving the rotation of the inner ring rotor and the inner ring of the slewing bearing. The gas after work is discharged from the air outlet.

[0010] The technical solution further defined in the present utility model is:

[0011] Furthermore, in the aforementioned slewing bearing with built-in air drive, the slewing bearing outer ring includes an upper slewing bearing outer ring and a lower slewing bearing outer ring, and the upper slewing bearing outer ring is located at the upper end of the lower slewing bearing outer ring to form a step structure;

[0012] The upper slewing bearing outer ring is a circular ring structure. The inner wall of the upper slewing bearing outer ring is provided with a raceway. The corresponding position of the slewing support inner ring is also provided with a raceway. The upper slewing bearing outer ring is assembled with the slewing bearing inner ring through rolling elements and maintained concentrically.

[0013] The inner diameter of the lower slewing bearing outer ring is eccentrically arranged with the outer diameters of the inner ring rotor and the lower slewing bearing outer ring. The inner diameter of the lower slewing bearing outer ring is the outer cavity wall of the working cavity. The outer cavity wall of the working cavity is concentrically arranged with the inner diameter of the end cover. The inner diameter and outer diameter of the end cover are eccentrically arranged.

[0014] Technical effect: The outer ring of the slewing bearing of the utility model is composed of two parts, the upper part is for assembling the concentrically arranged slewing bearing inner ring, and the lower part is for placing the inner ring rotor, blades and forming a working chamber. At the same time, the inner diameter of the lower slewing bearing outer ring is eccentrically arranged from the outer diameter of the inner ring rotor and the lower slewing bearing outer ring, so as to form eccentric pneumatics. The external air supply source inputs controllable compressed air, a small part of which enters the bottom of the blade, pushes the blade out, and makes the blade close to the outer wall of the cavity. Most of the compressed air enters the corresponding sealed space and acts on the blade. Due to the different extended lengths of the two blades, the pressure acting on the blade is unbalanced, which generates a torque difference, causing the blade and the rotor to rotate counterclockwise, and the gas after work is discharged; the outer cavity wall of the working chamber is concentrically arranged with the inner diameter of the end cover, and the inner diameter and outer diameter of the end cover are eccentrically arranged to meet the structure of the inner ring rotor, improve adaptability, and facilitate sealing.

[0015] In the aforementioned slewing bearing with built-in air drive, the lengths of the blades extending from the outer circumference of the inner rotor are different, and the blades abut against the outer wall of the working chamber.

[0016] The technical effect is that the blades have the same structure, but the lengths extending from the outer circumferential surface of the inner ring rotor are different. When the gas is input, a small part enters the bottom of the blade, pushing the blade out so that the blade is tightly attached to the outer wall of the cavity. Most of the compressed air enters the corresponding sealed space and acts on the blade. Due to the different lengths of the blades, the pressure acting on the blades is unbalanced, which produces a torque difference, causing the blades and the rotor to rotate counterclockwise, thereby better achieving drive.

[0017] In the aforementioned slewing bearing with built-in air drive, a sealing strip is provided between the upper end of the slewing bearing inner ring and the slewing bearing outer ring, and an O-ring and an O-ring retaining ring are provided between the lower end of the slewing bearing inner ring and the slewing bearing outer ring for sealing.

[0018] Technical effect: The air-driven slewing bearing of the utility model is driven by gas. After the gas is input, the air pressure in the working chamber is increased. The pressure of the compressed gas in the working chamber acts on the blades, causing them to rotate, thereby driving the entire rotor to rotate. In order to ensure working efficiency and prevent gas leakage, sufficient air tightness must be ensured in the working chamber of the slewing bearing. O-rings and O-ring retaining rings are used for sealing between the outer ring and the inner ring of the slewing bearing. The O-ring is placed in the groove of the inner ring. In order to keep the O-ring in a good sealing effect, it is fixed with cut-type O-ring retaining rings at the top and bottom to further enhance the sealing.

[0019] In the aforementioned slewing bearing with built-in air drive, the end cover and the outer ring of the slewing bearing are sealed by an O-ring and an O-ring retaining ring, and an O-ring is provided between the end cover and the inner ring rotor for sealing.

[0020] Technical effect: O-rings are provided between the end cover and the inner ring rotor, and between the end cover and the outer ring of the slewing bearing for sealing, which strengthens the sealing of the working chamber and ensures work efficiency.

[0021] In the aforementioned slewing bearing with built-in air drive, the rolling elements are spherical or cylindrical.

[0022] In the aforementioned slewing bearing with built-in air drive, one side of the outer ring of the slewing bearing on which the air inlet and the air outlet are provided extends outward to form an extension block, and the extension block is provided with an air inlet hole and an air outlet hole. The inner diameters of the air inlet hole and the air outlet hole are larger than the inner diameters of the air inlet and the air outlet hole. The air inlet hole and the air outlet hole penetrate the extension block and are connected to the corresponding air inlet and the air outlet hole for connecting to an external air source.

[0023] Technical effect: The utility model does not directly connect the air inlet and air outlet on the outer ring of the slewing bearing to the external source, but forms an extension block by extending the outer ring of the slewing bearing, and arranges corresponding air inlet and air outlet on the extension block, so as to increase the length and inner diameter of the air inlet and air outlet, thereby increasing the power.

[0024] In the aforementioned slewing bearing with built-in air drive, the air inlet and outlet holes in the extension block on the outer ring of the slewing bearing are both threaded holes.

[0025] Technical effect: The air inlet and outlet holes used in the utility model are threaded holes, which are convenient for connection to an external air supply source. The threaded connection is easy to install and disassemble, and the connection is tighter to ensure internal air tightness.

[0026] In the aforementioned slewing bearing with built-in air drive, the external air source is an adjustable air source.

[0027] Technical effect: The external air source of the utility model is adjustable, and the rotation speed of the slewing bearing can be quickly adjusted by adjusting the airflow. The speed and power can be selected in a wide range and the applicability is strong.

[0028] In the aforementioned slewing bearing with built-in air drive, the working chamber is filled with oil mist for lubrication.

[0029] Technical effect: The air-driven slewing bearing has a high speed. When working, the inside of the cavity needs to be injected with oil mist for lubrication to improve the lubrication effect, which is beneficial to the operation of the rotor and reduces energy consumption.

[0030] The beneficial effects of the utility model are:

[0031] The utility model has a built-in air-driven slewing bearing that converts gas pressure into rotational force. During operation, air is introduced through the air inlet, driving the internal rotor composed of the inner ring of the slewing bearing, the inner ring rotor, the blades and the end cover to move and rotate. Finally, the gas is discharged through the exhaust hole. The air intake can be replaced to achieve reversal. There is no energy conversion other than mechanical energy inside the utility model. Therefore, it has high working safety and is not easily affected by external factors during operation. Therefore, it is suitable for occasions with explosions, high temperatures and dust.

[0032] Soft characteristics refer to the fact that when the load increases, the speed drops significantly, and the relationship between torque and speed is more curved, showing a lower load capacity. The air-driven slewing bearing has soft characteristics, that is, it can adapt to a variety of working conditions and working states, and has different working performance under different load conditions. The soft characteristics of the built-in air-driven slewing bearing of the utility model enable it to work at full load for a long time with a small temperature rise, and it has overload protection performance and a long service life.

[0033] The built-in air-driven slewing bearing of the utility model can realize rapid adjustment of the slewing bearing speed by adjusting the airflow. The speed and power can be selected in a wide range. In working situations where low-speed rotation is required, there is no need to increase the radial size of the slewing bearing or an additional reduction mechanism to increase the transmission ratio, so that the slewing bearing structure is compact, saving installation space and maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is a schematic structural diagram of a slewing bearing with built-in air drive according to an embodiment of the utility model;

[0035] Figure 2 for Figure 1 Schematic diagram of the structure of the outer ring of the slewing bearing;

[0036] Figure 3 for Figure 1 Bottom view of

[0037] Figure 4 for Figure 1 Exploded diagram;

[0038] In the figure: 1-slewing bearing outer ring, 101-upper slewing bearing outer ring, 102-lower slewing bearing outer ring, 2-blades, 3-end cover, 4-rolling element, 5-sealing strip, 6-O-ring, 7-O-ring retaining ring, 8-slewing bearing inner ring, 9-inner ring rotor, 10-inlet hole, 11-outlet hole, 12-extension block. DETAILED DESCRIPTION

[0039] 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 embodiments described are only part of the embodiments of the present invention, not all of the embodiments; the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention. Example 1

[0040] This embodiment provides a slewing bearing with built-in air drive, see Figure 1 and 4 , comprising a slewing bearing stator and a slewing bearing rotor disposed in the slewing bearing stator, the slewing bearing rotor rotating in the slewing bearing stator;

[0041] See Figure 1 and 4The slewing bearing inner ring 8, the inner ring rotor 9, the blades 2 and the end cover 3 together constitute an air-driven slewing bearing rotor, which rotates during the operation of the slewing bearing. The slewing bearing inner ring 8 is arranged in the slewing bearing outer ring 1. A rolling body 4 is arranged between the slewing bearing inner ring 8 and the slewing bearing outer ring 1, and the two realize mutual rotation through the rolling body. The lower end of the slewing bearing inner ring 8 is fixed with the inner ring rotor 9 by bolts. Several radial slots are evenly distributed on the outer circumference of the inner ring rotor 9, and blades 2 are arranged in the radial slots. The end of the inner ring rotor 9 away from the slewing bearing inner ring 8 is fixed with the end cover 3 by bolts. A sealed working chamber is formed between the inner wall (inner diameter) of the lower slewing bearing outer ring in the slewing bearing outer ring 1, the outer wall (outer diameter) of the inner ring rotor 9 and the end cover. The blade 2 is located in the working chamber. The length of the blade 2 extending out of the outer circumference of the inner ring rotor 9 is different, and the blade 2 is against the outer wall of the working chamber.

[0042] See Figure 1 and 2 The slewing bearing outer ring 1 constitutes an air-driven slewing bearing stator, which is fixed and does not rotate during the operation of the slewing bearing. The slewing bearing outer ring 1 includes an upper slewing bearing outer ring 101 and a lower slewing bearing outer ring 102. The upper slewing bearing outer ring 101 is located at the upper end of the lower slewing bearing outer ring 102 to form a step structure. The upper slewing bearing outer ring 101 is a circular ring structure. The inner wall of the upper slewing bearing outer ring 101 is provided with a raceway, and the corresponding position of the slewing support inner ring 8 is also provided with a raceway. The upper slewing bearing outer ring 101 is assembled with the slewing bearing inner ring 8 through the rolling body 4 and maintained concentrically arranged; the inner diameter of the lower slewing bearing outer ring 102 is eccentrically arranged with the outer diameters of the inner ring rotor 9 and the lower slewing bearing outer ring 102 respectively. The inner diameter of the lower slewing bearing outer ring 102 is the outer cavity wall of the working chamber, and the outer diameter of the inner ring rotor 9 is the inner cavity wall of the working chamber. The outer cavity wall of the working chamber is concentrically arranged with the inner diameter of the end cover 3, and the inner diameter of the end cover 3 is eccentrically arranged with the outer diameter.

[0043] See Figure 3 An air inlet and an air outlet are provided on the outer ring 1 of the slewing bearing, and the air inlet and the air outlet are connected with the working chamber. One side of the slewing bearing outer ring 1 provided with the air inlet and the air outlet extends outward to form an extension block 12. The extension block 12 is provided with an air inlet 10 and an air outlet 11, which are both threaded holes. The inner diameters of the air inlet 10 and the air outlet 11 are larger than the inner diameters of the air inlet and the air outlet. The air inlet 10 and the air outlet 11 penetrate the extension block 12 and are connected with the corresponding air inlet and the air outlet, which are used to connect to an external adjustable air source, improve efficiency, facilitate connection with an external air supply source and ensure internal air tightness.

[0044] In this embodiment, in order to further ensure the sealing of the working chamber, refer to Figure 1A sealing strip 5 is provided between the upper end of the slewing bearing inner ring 8 and the slewing bearing outer ring 1, and an O-ring 6 and an O-ring retaining ring 7 are provided between the lower end of the slewing bearing inner ring 8 and the slewing bearing outer ring 1 for sealing. The O-ring is placed in the groove of the slewing bearing inner ring. In order to maintain a good sealing effect of the O-ring, it is fixed at the top and bottom with a cut-type O-ring retaining ring;

[0045] The end cover 3 and the outer ring 1 of the slewing support are sealed by an O-ring 6 and an O-ring retaining ring 7, and an O-ring 6 is provided between the end cover 3 and the inner ring rotor 9 for sealing.

[0046] In this embodiment, the rolling element 4 is spherical or cylindrical.

[0047] During specific implementation, the external air supply source inputs controllable compressed air from the air inlet and the air inlet hole 10. A small portion of the compressed air enters the bottom of the blade 2, pushing the blade 2 out so that the blade 2 is tightly attached to the outer wall of the working chamber. Most of the compressed air enters the corresponding sealed space of the working chamber and acts on the blade 2. Due to the different extended lengths of the blade 2, the pressure acting on the blade 2 is uneven, which produces a torque difference, causing the blade 2 and the rotor to rotate counterclockwise (reversal can be achieved by replacing the air intake). The gas after work is discharged from the air outlet and the air outlet 11. The speed can be adjusted in real time by controlling and adjusting the power of the external air supply source.

[0048] The torque of the air-driven slewing bearing is proportional to the area of ​​the exposed blades, the pressure, and the moment arm of the moment. The air-driven slewing bearing has a high speed, and the cavity needs to be injected with oil mist for lubrication during operation.

[0049] In addition to the above embodiments, the present invention may also have other implementations. Any technical solution formed by equivalent replacement or equivalent transformation falls within the scope of protection required by the present invention.

Claims

1. A slewing bearing with built-in air drive, characterized by: It includes a slewing bearing stator and a slewing bearing rotor arranged in the slewing bearing stator; The slewing bearing stator is a slewing bearing outer ring (1), and the slewing bearing outer ring (1) is provided with an air inlet and an air outlet; The slewing bearing rotor comprises blades (2), an end cover (3), a slewing bearing inner ring (8) and an inner ring rotor (9), wherein the slewing bearing inner ring (8) is arranged in the slewing bearing outer ring (1), and a rolling body (4) is provided between the slewing bearing inner ring (8) and the slewing bearing outer ring (1) to realize mutual rotation, the lower end of the slewing bearing inner ring (8) is connected to the inner ring rotor (9) by bolts, a plurality of radial slots are uniformly distributed on the outer circumference of the inner ring rotor (9), and the blades (2) are provided in the radial slots, and the end of the inner ring rotor (9) away from the slewing bearing inner ring (8) is connected to the end cover (3) by bolts, and a sealed working chamber is formed between the end cover (3), the slewing bearing outer ring (1) and the inner ring rotor (9), the blades (2) are located in the working chamber, and the air inlet and the air outlet are connected to the working chamber; The gas enters the working chamber from the air inlet to increase the air pressure, and the air pressure acts on the blade (2) to rotate it, thereby driving the rotation of the inner ring rotor (9) and the inner ring of the slewing support (8), and the gas after work is discharged from the air outlet.

2. The slewing bearing with built-in air drive according to claim 1, characterized in that: The slewing bearing outer ring (1) comprises an upper slewing bearing outer ring (101) and a lower slewing bearing outer ring (102), wherein the upper slewing bearing outer ring (101) is located at the upper end of the lower slewing bearing outer ring (102) to form a step structure; The upper slewing bearing outer ring (101) is a circular ring structure, the inner wall of the upper slewing bearing outer ring (101) is provided with a raceway, and the corresponding position of the slewing bearing inner ring (8) is also provided with a raceway, and the upper slewing bearing outer ring (101) is assembled with the slewing bearing inner ring (8) through the rolling body (4) and maintained in a concentric arrangement; The inner diameter of the lower slewing bearing outer ring (102) is eccentrically arranged with the outer diameters of the inner ring rotor (9) and the lower slewing bearing outer ring (102), the inner diameter of the lower slewing bearing outer ring (102) is the outer cavity wall of the working cavity, the outer cavity wall of the working cavity is concentrically arranged with the inner diameter of the end cover (3), and the inner diameter and outer diameter of the end cover (3) are eccentrically arranged.

3. The slewing bearing with built-in air drive according to claim 1, characterized in that: The lengths of the blades (2) extending out of the outer circumference of the inner ring rotor (9) are different, and the blades (2) abut against the outer cavity wall of the working cavity.

4. The slewing bearing with built-in air drive according to claim 1, characterized in that: A sealing strip (5) is provided between the upper end of the slewing bearing inner ring (8) and the slewing bearing outer ring (1), and an O-ring (6) and an O-ring retaining ring (7) are provided between the lower end of the slewing bearing inner ring (8) and the slewing bearing outer ring (1) for sealing.

5. The slewing bearing with built-in air drive according to claim 1, characterized in that: The end cover (3) and the slewing bearing outer ring (1) are sealed by an O-ring (6) and an O-ring retaining ring (7), and an O-ring (6) is provided between the end cover (3) and the inner ring rotor (9) for sealing.

6. The slewing bearing with built-in air drive according to claim 1, characterized in that: The rolling body (4) is spherical or cylindrical.

7. The slewing bearing with built-in air drive according to claim 1, characterized in that: The slewing bearing outer ring (1) is provided with an air inlet and an air outlet on one side thereof, which extends outward to form an extension block (12). The extension block (12) is provided with an air inlet hole (10) and an air outlet hole (11). The inner diameters of the air inlet hole (10) and the air outlet hole (11) are larger than the inner diameters of the air inlet and the air outlet. The air inlet hole (10) and the air outlet hole (11) penetrate the extension block (12) and are connected to the corresponding air inlet and the air outlet for connecting to an external air source.

8. The slewing bearing with built-in air drive according to claim 7, characterized in that: The air inlet hole (10) and the air outlet hole (11) in the upper extension block (12) of the slewing bearing outer ring (1) are both threaded holes.

9. The slewing bearing with built-in air drive according to claim 7, characterized in that: The external gas source is an adjustable gas source.

10. The slewing bearing with built-in air drive according to claim 1, characterized in that: The working chamber is filled with oil mist for lubrication.

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