Cylindrical roller bearing roller high-speed rotation drive device and driving method

Abstract

A cylindrical roller bearing roller high-speed self-rotation drive device and drive method, wherein the drive device includes an electric spindle, a flange, an elastic collet, an electromagnet, and a conductive slip ring. The electromagnet is fixed to the rotor head of the air-bearing electric spindle via the elastic collet. The conductive slip ring includes a conductive slip ring rotor and a conductive slip ring stator that are rotatably connected to each other. The conductive slip ring stator is coaxially fixed to the lower end of the flange. The conductive slip ring rotor is coaxially mounted on the electromagnet and the two are connected by fastening screws. The upper end of the flange is fixed to the housing of the air-bearing electric spindle. The conductive slip ring stator is connected to the conductive slip ring stator wire. The conductive slip ring rotor is electrically connected to the electromagnet via the electromagnet wire. The electromagnet is used to attract the cylindrical roller. The present invention uses the electromagnet to attract the cylindrical roller to drive the cylindrical roller to rotate, ensuring that the cylindrical roller is firmly attracted to the electromagnet, preventing relative sliding between the end face of the cylindrical roller and the lower end face of the electromagnet, which would cause wear on the cylindrical roller end face.

Description

Technical Field

[0001] The present invention belongs to the technical field of cylindrical roller driving, and in particular relates to a cylindrical roller bearing roller high-speed rotation driving device and a driving method. Background Art

[0002] Cylindrical roller bearings are widely used in automotive, machine tool, energy and power, rail transportation, aerospace, and other fields due to their low friction, long service life, and ease of disassembly and maintenance. As critical components for carrying and transmitting motion, the performance and operating condition of these bearings directly impact the performance, production efficiency, and even operational safety of the equipment. Dimensional, geometric, and other machining errors, material inhomogeneities, and wear during use can all lead to dynamic imbalance in the bearing components, such as roller and cage imbalance. Roller imbalance generates additional dynamic loads during high-speed operation, which can easily cause the rollers to skew or tilt. Roller tilt can affect their proper kinematic characteristics, increasing friction between the rollers and raceways and between the rollers and guide ribs. Furthermore, it can intensify friction and wear between the rollers and the cage, impacting the cage's dynamic stability and, in severe cases, causing the cage to break.

[0003] The diameter of the rollers of cylindrical roller bearings is mostly around tens of millimeters or smaller, so the dynamic imbalance detection is much more difficult than that of conventional rotating bodies (such as automobile wheels, machine tool spindles, etc.). The main reason for the difficulty in detection is that the cylindrical rollers are difficult to drive (it is difficult to make them rotate at high speed) and the surface is easily damaged during driving. The commonly used method for detecting the dynamic imbalance of cylindrical rollers in the industry is to support the cylindrical rollers with V-blocks or the outer cylindrical surface of the drum, and use the friction of the belt to drive the cylindrical rollers to rotate at high speed. Due to the dynamic imbalance of the cylindrical rollers, their high-speed rotation will cause vibration of the supporting pendulum frame. The sensor measures the amplitude of the pendulum frame and then uses a software algorithm to obtain the dynamic imbalance of the cylindrical rollers. The cylindrical rollers are supported by V-blocks or the outer cylindrical surface of the drum, and the belt friction drives their high rotation. This method is a contact drive, which has the problems of low speed and excessive surface damage. Summary of the Invention

[0004] The purpose of the present invention is to propose a high-speed self-rotation drive device and drive method for cylindrical roller bearings, which can drive the cylindrical roller to reach tens of thousands of revolutions without damaging the surface of the cylindrical roller, thereby greatly reducing the difficulty of detecting the dynamic imbalance of the cylindrical roller.

[0005] The objectives and technical problems solved by the present invention are achieved by adopting the following technical solutions. A cylindrical roller bearing high-speed self-rotation drive device according to the present invention comprises: an electric spindle, a flange, an elastic collet, an electromagnet, and a conductive slip ring. The electromagnet is fixed to the rotor head of the air-bearing electric spindle via the elastic collet. The conductive slip ring comprises a conductive slip ring rotor and a conductive slip ring stator that are rotatably connected to each other. The conductive slip ring stator is coaxially fixed to the lower end of the flange. The conductive slip ring rotor is coaxially mounted on the electromagnet and the two are connected by fastening screws. The upper end of the flange is fixed to the housing of the air-bearing electric spindle. The conductive slip ring stator is connected to the conductive slip ring stator wire. The conductive slip ring rotor is electrically connected to the electromagnet via the electromagnet wire. When energized, the electromagnet is used to attract the cylindrical roller.

[0006] Furthermore, the elastic collet is fixed to the head of the rotor via a locking nut.

[0007] Furthermore, the elastic collet includes an upper end and a lower end, the outer circumferential surface of the upper end is a first conical surface that cooperates with the inner hole inclined surface of the rotor, and the outer circumferential surface of the lower end is a second conical surface that cooperates with the locking nut; a clamping hole that passes through the upper and lower parts is provided in the center of the elastic collet, and the elastic collet is provided with a first groove and a second groove that are spaced apart along the circumferential direction, and the first groove and the second groove are both radially connected to the clamping hole, the axial opening of the first groove is located at the upper end surface of the elastic collet, and the axial opening of the second groove is located at the lower end surface of the elastic collet.

[0008] Furthermore, the main body of the electromagnet is a cylindrical structure, and the tail of the electromagnet extends upward to form a long columnar structure, and the clamping hole can stably clamp the long columnar structure when it contracts.

[0009] Furthermore, the long columnar structure and the inner wall of the conductive slip ring rotor form an annular space for accommodating the electromagnet wire.

[0010] Furthermore, the conductive slip ring stator conductor is connected to the power supply circuit and demagnetization circuit of the electromagnet.

[0011] Furthermore, the electric spindle adopts an air-floating electric spindle.

[0012] Furthermore, the lower end of the conductive slip ring rotor protrudes from the lower end of the conductive slip ring stator in the axial direction, so that the lower end of the conductive slip ring rotor forms a flange protruding from the conductive slip ring stator, and the flange of the conductive slip ring rotor is fixedly connected to the electromagnet by fastening screws.

[0013] The present invention also provides a driving method using the cylindrical roller bearing roller high-speed rotation driving device, comprising the following steps:

[0014] Step 1: Clean compressed air is introduced into the air inlet of the air flotation sleeve. After the compressed air enters the air flotation sleeve, an air film with a certain pressure distribution is formed on the inner surface of the air flotation sleeve. The cylindrical roller is loaded into the air flotation sleeve. It should be ensured that the cylindrical roller is suspended in the air flotation sleeve without contact under the bearing force of the air film.

[0015] Step 2: Control the electric spindle to move slowly downward. When the lower end face of the electromagnet approaches the end face of the cylindrical roller, the power supply circuit of the electromagnet supplies power to the conductive slip ring stator wire, which in turn energizes the electromagnet and generates electromagnetic attraction to attract the cylindrical roller. The electric spindle starts, and the strong attraction of the electromagnet to the cylindrical roller drives the cylindrical roller to rotate synchronously at high speed.

[0016] Step 3: When the electric spindle reaches the predetermined speed, the power supply circuit of the electromagnet is converted to a demagnetization circuit, so that the magnetic force between the electromagnet and the cylindrical roller disappears quickly. The cylindrical roller falls into the air bearing sleeve under the action of gravity and rotates freely without contact. After the rotation stabilizes, the dynamic unbalance detection of the cylindrical roller can be carried out.

[0017] Step 4: After the dynamic unbalance detection of the cylindrical roller is completed, the electromagnet is energized again to remove the cylindrical roller from the air bearing sleeve and demagnetize it.

[0018] The present invention drives the cylindrical roller to rotate by using an electromagnet to adsorb the cylindrical roller. Since the electromagnetic attraction force of the electromagnet is usually above several hundred Newtons, the cylindrical roller can be firmly adsorbed on the electromagnet, thereby preventing the end face of the cylindrical roller from sliding relative to the lower end face of the electromagnet, thereby preventing the end face of the cylindrical roller from being worn.

[0019] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present invention more obvious and easy to understand, the following preferred embodiments are specifically cited and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a front view schematic diagram of the roller high-speed rotation driving device of the present invention.

[0021] Figure 2 yes Figure 1 Schematic diagram of the AA cross-section structure in.

[0022] Figure 3 It is a three-dimensional diagram of the elastic collet in the present invention.

[0023] Figure 4 It is a three-dimensional diagram of the electromagnet in the present invention.

[0024] Figure 5 It is a schematic diagram of the cooperation between the elastic collet and the locking nut in the present invention.

[0025] Description of reference numerals:

[0026] 1-air-floating electric spindle, 2-flange, 3-elastic chuck, 4-rotor, 5-locking nut, 6-electromagnet, 7-conductive slip ring rotor, 8-conductive slip ring stator, 9-cylindrical roller, 10-air-floating sleeve, 11-conductive slip ring stator wire, 12-electromagnet wire, 13-fastening screw, 30-clamping hole, 31-upper end, 32-lower end, 33-first groove, 34-second groove, 311-first conical surface, 321-second conical surface, 41-inner hole inclined surface, 60-annular space, 61-long columnar structure, 101-air inlet. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and preferred embodiments.

[0028] like Figures 1 to 5 A high-speed self-rotation drive device for a cylindrical roller bearing comprises an air-bearing electric spindle 1, a flange 2, an elastic collet 3, an electromagnet 6, and a conductive slip ring. The electromagnet 6 is detachably fixed to the head of the rotor 4 of the air-bearing electric spindle via the elastic collet 3. The rotor 4 of the air-bearing electric spindle rotates at high speed to provide rotational power for the cylindrical roller 9. The upper end of the flange 2 is fixed to the head of the housing of the air-bearing electric spindle. The conductive slip ring comprises a conductive slip ring rotor 7 and a conductive slip ring stator 8 that are rotatably connected to each other. The conductive slip ring stator 8 is coaxially fixed to the lower end of the flange 2. The conductive slip ring rotor 7 is coaxially mounted on the electromagnet 6, and the two are connected by a fastening screw 13 to ensure synchronous rotation. Preferably, the fastening screws are evenly distributed in the circumferential direction of the outer peripheral surface of the electromagnet to ensure dynamic balance during high-speed rotation. The slip-ring stator 8 is connected to one end of a conductive slip-ring stator conductor 11, the other end of which is connected to the power supply circuit of the electromagnet. The slip-ring rotor 7 and the electromagnet 6 are stably electrically connected via the electromagnet conductor 12. During operation, the slip-ring stator 8 transmits the current supplied by the conductive slip-ring stator conductor to the slip-ring rotor 7, which then transmits the current to the electromagnet 6 via the electromagnet conductor 12, providing a stable power source for the electromagnet. When energized, the electromagnet is used to attract the cylindrical roller 9.

[0029] Combine Figure 3 and Figure 4In this embodiment, the elastic collet 3 is fixed to the head of the rotor 4 by a locking nut 5. Specifically, the elastic collet 3 includes an upper end 31 and a lower end 32. The outer peripheral surface of the upper end 31 is a first conical surface 311 that cooperates with the inner hole inclined surface 41 of the rotor, and the outer peripheral surface of the lower end 32 is a second conical surface 321 that cooperates with the locking nut 5. A clamping hole 30 that passes through the elastic collet from top to bottom (axially through) is provided in the center of the elastic collet. The elastic collet is provided with a first groove 33 and a second groove 34 that are spaced apart along the circumference. The first groove and the second groove do not penetrate the elastic collet in the axial direction. The first groove and the second groove pass through the clamping hole in the radial direction. The axial opening of the first groove is located at the upper end surface of the elastic collet, and the axial opening of the second groove is located at the lower end surface of the elastic collet.

[0030] Furthermore, the main body of the electromagnet 6 is a cylindrical structure, and the tail of the electromagnet extends upward to form a long columnar structure 61, which can stably clamp the long columnar structure 61 when the clamping hole contracts. The opening directions of the first groove and the second groove are opposite, which is conducive to the radial contraction of the upper and lower ends of the elastic clamp, thereby more evenly and stably clamping the long columnar structure at the tail of the electromagnet. The outer diameter of the long columnar structure 61 should be significantly smaller than the outer diameter of the main body of the electromagnet, and the long columnar structure and the inner wall of the conductive slip ring rotor form an annular space 60 to accommodate the electromagnet wire, so that the electromagnet wire can be stored in the rear end space of the electromagnet without being exposed; secondly, the annular space also provides operating space for locking the locking nut.

[0031] The drive device may further include an air bearing sleeve 10. The drive device and air bearing sleeve 10 cooperate to detect the dynamic imbalance of the cylindrical roller. The air bearing sleeve 10 is mounted on the cylindrical roller dynamic imbalance measuring device. The specific structure and principle of the cylindrical roller dynamic imbalance measuring device are described in the Chinese patent application "A Dynamic Unbalance Measuring Device for Low-Mass Cylindrical Rollers in High-Speed ​​Bearings" (authorization publication number CN216791504U). The air bearing sleeve 10 in this embodiment is generally made of aluminum or copper, while the cylindrical roller is made of steel. The air bearing sleeve is serialized and used in conjunction with the cylindrical roller. When compressed air is introduced into the air bearing sleeve, the air film generated by the air bearing sleeve acts as a load-bearing device for the cylindrical roller. The dimensions of the air bearing sleeve and the pressure of the compressed air can be adjusted according to the dimensions of the cylindrical roller to meet the dynamic imbalance detection requirements of cylindrical rollers of different sizes.

[0032] The working process of the present invention for driving the cylindrical roller to rotate at high speed is as follows: (1) Clean compressed air is introduced into the air inlet 101 of the air flotation sleeve. After the compressed air enters the air flotation sleeve, an air film with a certain pressure distribution is formed on the inner surface of the air flotation sleeve. The cylindrical roller is loaded into the air flotation sleeve, and it should be ensured that the cylindrical roller is suspended in the air flotation sleeve without contact under the bearing capacity of the air film. (2) The air flotation electric spindle is controlled to move slowly downward. When the lower end face 62 of the electromagnet approaches the end face of the cylindrical roller, the power supply circuit of the electromagnet supplies power to the conductive slip ring stator wire, thereby energizing the electromagnet and generating electromagnetic attraction to attract the cylindrical roller; the air flotation electric spindle is started, and the strong attraction of the electromagnet to the cylindrical roller is used to drive the cylindrical roller to rotate synchronously at high speed. (3) When the air-bearing electric spindle reaches a predetermined speed, the power supply circuit of the electromagnet is converted to a demagnetization circuit, causing the magnetic force between the electromagnet and the cylindrical roller to quickly disappear. The cylindrical roller falls into the air-bearing sleeve under the action of gravity and rotates freely without contact. After the rotation stabilizes, the dynamic imbalance of the cylindrical roller can be detected. (4) After the dynamic imbalance of the cylindrical roller is detected, the electromagnet is powered on again to remove the cylindrical roller from the air-bearing sleeve and demagnetize it. It is worth noting that the power supply circuit and demagnetization circuit of the electromagnet are existing technologies and will not be described in detail here.

[0033] In this embodiment, the lower end of the slip-ring rotor should axially protrude beyond the lower end of the slip-ring stator, forming a flange protruding from the stator. The flange is connected to the electromagnet via a setscrew. In another embodiment, the slip rings can be replaced by bearings. The inner ring of the bearing acts as the slip-ring rotor, and the outer ring of the bearing acts as the stator. The inner ring of the bearing is used to securely connect to the electromagnet. The bearing can be modified to ensure that the inner ring protrudes downward from the outer ring. The rolling element between the inner and outer rings of the bearing should be a metallic conductor, and the outer ring of the bearing should be fixed to the flange.

[0034] In this embodiment, an air-floating electric spindle is used, and no non-standard modification is required. Under the premise of ensuring the rotation accuracy, an ordinary electric spindle can also be used in other embodiments to reduce costs.

[0035] The above description is only a preferred embodiment of the present invention, and any parts not described in detail are all prior art; any simple modifications, equivalent changes and modifications made to the above embodiments by any technician familiar with the profession based on the technical essence of the present invention without departing from the scope of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A cylindrical roller bearing roller high-speed rotation drive device, characterized in that include: An electric spindle, a flange, an elastic collet, an electromagnet, and a conductive slip ring. The electromagnet is fixed to the rotor head of the air-bearing electric spindle via the elastic collet. The conductive slip ring includes a conductive slip ring rotor and a conductive slip ring stator that are rotatably connected to each other. The conductive slip ring stator is coaxially fixed to the lower end of the flange. The conductive slip ring rotor is coaxially sleeved on the electromagnet and the two are connected by fastening screws. The upper end of the flange is fixed to the housing of the air-bearing electric spindle. The conductive slip ring stator is connected to the conductive slip ring stator wire. The conductive slip ring rotor is electrically connected to the electromagnet via the electromagnet wire. When energized, the electromagnet is used to attract the cylindrical roller. The elastic collet is fixed to the head of the rotor by a locking nut; the elastic collet includes an upper end portion and a lower end portion, the outer circumferential surface of the upper end portion is a first conical surface that cooperates with the inclined surface of the inner hole of the rotor, and the outer circumferential surface of the lower end portion is a second conical surface that cooperates with the locking nut; a clamping hole is provided in the center of the elastic collet that passes through the upper and lower parts, and the elastic collet is provided with a first groove and a second groove distributed at intervals along the circumferential direction, and the first groove and the second groove are both radially connected to the clamping hole, the axial opening of the first groove is located at the upper end surface of the elastic collet, and the axial opening of the second groove is located at the lower end surface of the elastic collet; The main body of the electromagnet is a cylindrical structure, and the tail of the electromagnet extends upward to form a long columnar structure. When the clamping hole contracts, it can stably clamp the long columnar structure. The long columnar structure and the inner wall of the conductive slip ring rotor form an annular space for accommodating the electromagnet wire.

2. The cylindrical roller bearing roller high-speed rotation drive device according to claim 1, characterized in that: The conductive slip ring stator conductor is connected to the power supply circuit and the demagnetization circuit of the electromagnet.

3. The cylindrical roller bearing roller high-speed rotation drive device according to claim 1, characterized in that: The electric spindle adopts air-floating electric spindle.

4. The cylindrical roller bearing roller high-speed rotation drive device according to claim 1, characterized in that: The lower end of the conductive slip ring rotor protrudes from the lower end of the conductive slip ring stator in the axial direction, so that the lower end of the conductive slip ring rotor forms a flange protruding from the conductive slip ring stator, and the flange of the conductive slip ring rotor is fixedly connected to the electromagnet by fastening screws.

5. A driving method using the cylindrical roller bearing roller high-speed rotation driving device according to any one of claims 1 to 4, comprising the following steps: Step 1: Clean compressed air is introduced into the air inlet of the air flotation sleeve. After the compressed air enters the air flotation sleeve, a layer of air film with pressure distribution is formed on the inner surface of the air flotation sleeve. The cylindrical roller is loaded into the air flotation sleeve. It should be ensured that the cylindrical roller is suspended in the air flotation sleeve without contact under the bearing force of the air film. Step 2: Control the electric spindle to move slowly downward. When the lower end face of the electromagnet approaches the end face of the cylindrical roller, the power supply circuit of the electromagnet supplies power to the conductive slip ring stator wire, which in turn energizes the electromagnet and generates electromagnetic attraction to attract the cylindrical roller. The electric spindle starts, and the strong attraction of the electromagnet to the cylindrical roller drives the cylindrical roller to rotate synchronously at high speed. Step 3: When the electric spindle reaches the predetermined speed, the power supply circuit of the electromagnet is converted to a demagnetization circuit, so that the magnetic force between the electromagnet and the cylindrical roller disappears quickly. The cylindrical roller falls into the air bearing sleeve under the action of gravity and rotates freely without contact. After the rotation stabilizes, the dynamic unbalance detection of the cylindrical roller can be carried out. Step 4: After the dynamic unbalance detection of the cylindrical roller is completed, the electromagnet is energized again to remove the cylindrical roller from the air bearing sleeve and demagnetize it.

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