Self-cooling ceramic cylindrical roller, bearing and experimental temperature measuring device

Abstract

The application relates to a self-cooling ceramic cylindrical roller, a bearing and an experimental temperature measuring device, and relates to the technical field of roller bearings, which comprises a cylindrical roller body, a plurality of convection cooling cavities are arranged in the roller body along the axial direction of the roller body, the convection cooling cavities are uniformly and interval distributed along the axial direction of the roller body, and reinforcing ribs are formed between the adjacent convection cooling cavities; a plurality of pumping air holes are arranged in the two end faces of the roller body, each pumping air hole is communicated with a corresponding convection cooling cavity; the pumping air holes are uniformly and interval distributed along the axial direction of the roller body on the end face, each pumping air hole extends in an arc shape from the axis of the roller body to the outer periphery on the end face; pumping blades are formed between the adjacent pumping air holes, the pumping blades disturb air when the roller body rotates, air is pumped into the corresponding convection cooling cavity from one end pumping air hole and is discharged from the other end pumping air hole. The application has the beneficial effects of improving the air flow efficiency and strengthening the heat dissipation effect.

Description

Technical Field

[0001] This invention relates to the field of roller bearing technology, and more particularly to a self-cooling ceramic cylindrical roller, bearing, and experimental temperature measuring device. Background Technology

[0002] Roller bearings are an important type of rolling bearing, using rollers as rolling elements to achieve rotational support. They are characterized by low starting torque and high rotational accuracy. Based on their structural type, they can be divided into self-aligning roller bearings, thrust self-aligning roller bearings, tapered roller bearings, and cylindrical roller bearings. Due to the line contact structure between the rollers and raceways, these bearings have significant load-bearing advantages under heavy load conditions.

[0003] Under ultra-high-speed operating conditions (DN value greater than 4 million), bearings using solid ceramic cylindrical rollers present significant dynamic challenges. The solid structure results in a large overall mass and high moment of inertia of the rollers, generating greater centrifugal force during high-speed rotation. This increased centrifugal force leads to increased contact stress between the rollers and raceways, heavier contact load on the raceways, and consequently, a significant increase in frictional heat. This exacerbates fatigue wear and spalling risks, ultimately limiting the bearing's high-speed operating limits. Therefore, although solid ceramic rollers possess good stiffness characteristics, their disadvantages in mass and inertia are detrimental to the lightweight and low-heat operation requirements under extremely high-speed conditions.

[0004] In existing technologies, to reduce the weight of ceramic rollers, ordinary hollow rollers are used, i.e., reducing structural weight through a central through-hole. However, such hollow rollers lack a reasonable internal support topology, and a single through-hole cannot effectively resist the elliptic deformation of the outer shell under radial loads, resulting in insufficient local cross-sectional stiffness. Under long-term high-speed, heavy-load combined operating conditions, this structure is prone to local instability, which is particularly detrimental to brittle ceramic materials. Once high tensile stress or bending stress concentration occurs in a localized area of ​​the structure, crack propagation is easily induced, seriously affecting the bearing's operational reliability and service life. Summary of the Invention

[0005] (a) Technical problems to be solved

[0006] In view of the above-mentioned shortcomings and deficiencies of the prior art, the present invention provides a self-cooling ceramic cylindrical roller, bearing and experimental temperature measuring device, which solves the technical problem that the ceramic cylindrical roller has a large mass, obvious rolling friction heat generation, which is not conducive to ultra-high speed conditions.

[0007] (II) Technical Solution

[0008] To achieve the above objectives, the main technical solutions adopted by the present invention include:

[0009] In a first aspect, embodiments of the present invention provide a self-cooling ceramic cylindrical roller, comprising a cylindrical roller body, wherein a plurality of convection cooling cavities are formed inside the roller body along its own axis, the plurality of convection cooling cavities are evenly spaced along the circumferential axis of the roller body, and reinforcing ribs are formed between adjacent convection cooling cavities;

[0010] The roller body has multiple pumping air holes on both ends. The pumping air holes on both ends of the roller body are respectively arranged on both sides of the convection cooling cavity, and each pumping air hole is connected to the corresponding convection cooling cavity.

[0011] The plurality of pumping air holes are evenly spaced along the circumferential axis of the roller body on the end face, and each pumping air hole extends in an arc shape from the axis of the roller body to the outer periphery on the end face.

[0012] Pumping blades are formed between adjacent pumping air holes. When the pumping blades rotate with the roller body, they disturb the air, causing the air to be drawn into the corresponding convection cooling cavity from one pumping air hole and discharged from the other pumping air hole.

[0013] This invention discloses a self-cooling ceramic cylindrical roller. Multiple convection cooling cavities are formed inside the roller body. This reduces the mass of the roller body, decreasing the stress caused by contact with the raceway and thus reducing the heat generated during rolling friction. Furthermore, it allows air to pass through the convection cooling cavities, carrying away some of the heat generated during rolling friction. The convection cooling cavities are arranged circumferentially at uniform intervals, forming reinforcing ribs between adjacent cavities, thereby improving the internal support strength and radial stiffness of the roller body. Additionally, pumping air holes are formed on both ends of the roller body, with pumping blades between adjacent holes. When the roller body rotates, one set of pumping blades draws external air into the pumping air holes and then into the convection cooling cavities, while another set of pumping blades extracts the incoming air and heat, improving airflow efficiency and enhancing heat dissipation.

[0014] Optionally, the cross-section of the convection cooling cavity is hexagonal, and multiple convection cooling cavities form a hexagonal honeycomb structure.

[0015] By setting the convection cooling cavity to a regular hexagonal cross-section, the internal reinforcing ribs of the roller body form a regular hexagonal honeycomb structure, providing uniform support to the outer shell; improving the overall radial stiffness of the roller; reducing the elliptic tendency of simple hollow structures; providing internal flow channels for lubricating oil; optimizing the load transfer path, making the honeycomb ribs mainly bear compressive stress, which is more suitable for the characteristics of ceramic materials, resulting in high support efficiency per unit mass; uniform distribution in the plane; forming continuous and regular flow channels; and being more suitable for integrated additive manufacturing.

[0016] Optionally, the roller body has a convection cooling cavity at the center of the shaft, and the two end faces of the roller body have central holes at the center of the shaft.

[0017] By creating a central hole and a corresponding convection cooling cavity, the weight can be further reduced without compromising the structural strength of the roller body.

[0018] Optionally, the roller body is a one-piece molded structure; the material of the roller body is silicon nitride ceramic.

[0019] The internal honeycomb structure, end face blades, transition faults and other complex structures are difficult to form with conventional machining; the one-piece molding can avoid the introduction of local stress concentration at the splicing interface; it is suitable for manufacturing small size, high complexity and closed internal structure; after molding, the outer circle can be precision machined to meet the accuracy requirements of the roller.

[0020] Optionally, a gap exists between the pumping blade and the end of the reinforcing rib, and an annular structural fault aligned with the gap is formed inside the roller body at the outer periphery of the end of the convection cooling cavity.

[0021] By incorporating gaps and annular structural breaks, the geometric interference between the rounded corners of the end-face guide grooves and the sharp corners of the honeycomb channels is mitigated; the forming integrity of this area is improved during ceramic 3D printing and high-temperature sintering; a local buffer and flow collection zone is formed before the fluid enters the honeycomb channels; the uniformity of lubricant distribution to each honeycomb channel is improved; and the degree of local stress concentration at the interface is reduced. Furthermore, rigid contact between the pump blades and the reinforcing ribs and convection cooling cavities can easily lead to sharp corners at the interface, which is detrimental to printing and forming. During sintering shrinkage, defects can be induced locally, and stress concentration is more pronounced under high-speed loads, making it easy for fluid to deviate when entering the channels. Therefore, gaps and annular structural breaks are a key innovative detail that distinguishes this patent from ordinary internally perforated structures.

[0022] Secondly, this application provides a bearing comprising an inner ring and an outer ring arranged coaxially, and a plurality of roller bodies circumferentially spaced and rolled between the inner ring and the outer ring.

[0023] By embedding the roller body between the inner and outer rings, the bearing can effectively and promptly dissipate the heat generated by rolling friction of the roller body under ultra-high-speed conditions with a DN value greater than 4 million, while reducing the heat transferred to the inner and outer rings, thereby improving the bearing's operating conditions and service life.

[0024] Thirdly, this application provides an experimental temperature measuring device, including a fixed drive assembly for fixing and driving the bearing to rotate, an infrared temperature measuring probe for infrared temperature measurement of the inner ring, the outer ring and the roller body, and a wind-driven assembly disposed on both sides of the fixed drive assembly to provide air with different flow rates flowing through the convection cooling cavity.

[0025] A bearing equipped with conventional solid ceramic cylindrical rollers is installed in a fixed drive assembly. The fixed drive assembly drives the bearing to rotate at a specified high speed. After a period of time, the temperature of the inner ring, outer ring, and roller body is detected and recorded by an infrared temperature probe. Subsequently, a bearing equipped with self-cooling ceramic cylindrical rollers is fixed in the fixed drive assembly, allowing the fixed drive assembly to drive the bearing to rotate at the same speed as the conventional bearing. At this time, the wind-driven assembly is not working, and the temperature of the inner ring, outer ring, and roller body of the bearing is recorded. Then, the wind-driven assembly is activated, and the airflow speed is gradually increased, while the temperature of the inner ring, outer ring, and roller body of the bearing is recorded. This experimental temperature measurement device can measure the changes in bearing temperature, performance, and service life caused by the self-cooling ceramic cylindrical rollers under actual working conditions. At the same time, some parameters and designs of the self-cooling ceramic cylindrical rollers can be modified based on the experimental measurement results to obtain more suitable self-cooling ceramic cylindrical rollers.

[0026] Optionally, the fixed drive assembly includes two fixed sleeves arranged coaxially at intervals, two auxiliary wheels rotatably disposed between the two fixed sleeves and abutting against the lower side of the outer circumference of the outer ring, a drive wheel rotatably disposed between the two fixed sleeves and abutting against the outer circumference of the outer ring to drive the outer ring to rotate, and a fixing clamp disposed inside the fixed sleeve to fix the inner ring, wherein a fixed interval is formed between the two fixed sleeves for the bearing to be coaxially inserted.

[0027] Two auxiliary wheels and one drive wheel lock the bearing's displacement along its own axis. The drive wheel drives the bearing's outer ring to rotate, and the fixed frame locks the bearing's displacement along its own axis, thus ensuring that the bearing will not shift under high-speed operation. By arranging two fixed sleeves at intervals, the airflow rate and direction are more controllable.

[0028] Optionally, the two auxiliary wheels are vertically slidably disposed on the lower side of the fixed sleeve, and the drive wheel is vertically slidably disposed on the upper side of the fixed sleeve.

[0029] By vertically sliding two auxiliary wheels to the lower side of the fixed sleeve and vertically sliding the drive wheel to the upper side of the fixed sleeve, it is easier to embed the bearing into the fixed interval. On the other hand, the fixed drive assembly can be used to drive different types of bearings, thereby enabling the experimental temperature measuring device to perform experimental temperature measurement on different types of bearings and rollers.

[0030] Optionally, the wind-driven assembly includes a rotating frame rotatably mounted on two fixed sleeves at opposite ends, and a high-speed fan fixed on the rotating frame. The two high-speed fans rotate synchronously with the rotating frame and are coaxially aligned with the fixed sleeves. The two high-speed fans have the same air outlet direction and form a high-speed airflow inside the fixed sleeves.

[0031] Two sets of rotating frames drive two high-speed fans to rotate, allowing the high-speed fans to rotate coaxially with the fixed sleeve, thus providing a more accurate and controllable high-speed airflow. At the same time, the rotating frames can also allow the high-speed fans to be detached from the fixed sleeve, enabling temperature measurement when there is no high-speed fan, when there is a single high-speed fan, and when both high-speed fans are working simultaneously, making it more convenient.

[0032] (III) Beneficial Effects

[0033] The beneficial effects of this invention are as follows: The self-cooling ceramic cylindrical roller, bearing, and experimental temperature measuring device of this invention have multiple convection cooling cavities inside the roller body. On the one hand, this reduces the mass of the roller body, decreasing the stress increased by contact with the raceway, thereby reducing the heat generated during rolling friction. On the other hand, it allows air to pass through the convection cooling cavities to carry away some of the heat generated during the rolling friction of the roller body. At the same time, the convection cooling cavities are arranged circumferentially at uniform intervals, forming reinforcing ribs between adjacent convection cooling cavities, thereby improving the internal support strength and radial stiffness of the roller body. In addition, pumping air holes are opened on both ends of the roller body, and pumping blades are formed between adjacent pumping air holes. That is, when the roller body rotates at a high speed, one set of pumping blades can draw external air into the pumping air holes and then into the convection cooling cavity, while another set of pumping blades extracts the incoming air and heat, thereby improving the efficiency of air circulation and enhancing the heat dissipation effect. Attached Figure Description

[0034] Figure 1 This is a three-dimensional schematic diagram of the roller body in Embodiment 1 of the present invention;

[0035] Figure 2 This is a cross-sectional view of the roller body in Embodiment 1 of the invention;

[0036] Figure 3 This is a second-view sectional view of the roller body in Embodiment 1 of the invention;

[0037] Figure 4 This is a schematic diagram of the bearing structure in Embodiment 2 of the invention;

[0038] Figure 5 This is a schematic diagram of the experimental temperature measuring device in Embodiment 3 of the invention;

[0039] Figure 6 This is a cross-sectional view of the experimental temperature measuring device in Embodiment 3 of the invention;

[0040] Figure 7 for Figure 6 Enlarged view of point A.

[0041] [Explanation of Labels in the Attached Image]

[0042] 1. Roller body; 11. Convection cooling cavity; 12. Reinforcing rib; 13. Pumping air hole; 14. Pumping blade; 15. Center hole; 16. Clearance; 17. Annular structural fault; 21. Inner ring; 22. Outer ring; 23. Cage; 31. Experimental support; 32. Fixed drive assembly; 321. Fixed sleeve; 322. Auxiliary wheel; 323. Drive wheel; 324. Fixed clamp; 3241. Clamping ring; 3242. Clamping rod; 3243. Clamping piece; 33. Infrared temperature probe; 34. Wind-driven drive assembly; 341. Rotating frame; 342. High-speed fan. Detailed Implementation

[0043] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0044] The self-cooling ceramic cylindrical roller, bearing, and experimental temperature measuring device proposed in this invention have multiple convection cooling cavities inside the roller body. On the one hand, this reduces the mass of the roller body, decreasing the stress caused by contact with the raceway and thus reducing the heat generated during rolling friction. On the other hand, it allows air to pass through the convection cooling cavities, carrying away some of the heat generated during rolling friction. The convection cooling cavities are arranged circumferentially at uniform intervals, forming reinforcing ribs between adjacent cavities, thereby improving the internal support strength and radial stiffness of the roller body. Furthermore, pumping air holes are opened on both ends of the roller body, and pumping blades are formed between adjacent pumping air holes. When the roller body rotates at high speed, one set of pumping blades draws external air into the pumping air holes and then into the convection cooling cavities, while another set of pumping blades extracts the incoming air and heat, improving airflow efficiency and enhancing heat dissipation.

[0045] To better understand the above technical solutions, exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that the present invention can be understood more clearly and thoroughly, and that the scope of the present invention can be fully conveyed to those skilled in the art.

[0046] Example 1

[0047] Reference Figures 1-3 A self-cooling ceramic cylindrical roller includes a cylindrical roller body 1. Multiple convection cooling cavities 11 are formed inside the roller body 1 along its own axis. These cavities are evenly spaced circumferentially along the axis of the roller body 1, and reinforcing ribs 12 are formed between adjacent cavities. Multiple pumping air holes 13 are formed on both ends of the roller body 1. The pumping air holes 13 on both ends of the roller body 1 are correspondingly located on both sides of the convection cooling cavities 11. Each pumping air hole... The air inlet 13 is connected to the corresponding convection cooling cavity 11. Multiple pumping air inlets 13 are evenly spaced along the circumferential axis of the roller body 1 on the end face. Each pumping air inlet 13 extends in an arc shape from the axis of the roller body 1 to the outer periphery on the end face. Pumping blades 14 are formed between adjacent pumping air inlets 13. When the pumping blades 14 rotate with the roller body 1, they disturb the air, so that the air is drawn into the corresponding convection cooling cavity 11 from one pumping air inlet 13 and discharged from the other pumping air inlet 13.

[0048] The pumping blades 14 have 4 to 8 blades at each end, preferably 6.

[0049] Multiple convection cooling cavities 11 are formed inside the roller body 1. On the one hand, this reduces the mass of the roller body 1, decreases the stress caused by contact with the raceway, and thus reduces the heat generated during rolling friction. On the other hand, it allows air to pass through the convection cooling cavities 11 to carry away some of the heat generated during rolling friction. The convection cooling cavities 11 are arranged at uniform intervals in the circumference, forming reinforcing ribs 12 between adjacent convection cooling cavities 11, thereby improving the internal support strength and radial stiffness of the roller body 1. In addition, pumping air holes 13 are formed on both ends of the roller body 1, and pumping blades 14 are formed between adjacent pumping air holes 13. That is, when the roller body 1 rotates at a high speed, one set of pumping blades 14 can draw external air into the pumping air holes 13 and then into the convection cooling cavity, while another set of pumping blades 14 can extract the incoming air and heat, thereby improving the efficiency of air circulation and enhancing the heat dissipation effect.

[0050] The convection cooling cavity 11 has a regular hexagonal cross-section, and the reinforcing ribs 12 inside the roller body 1 have a regular hexagonal honeycomb structure. This provides uniform support to the outer shell, improves the overall radial stiffness of the roller, and reduces the elliptic tendency of simple hollow structures; it provides internal flow channels for lubricating oil, optimizes the load transfer path, and makes the honeycomb ribs mainly bear compressive stress, which is more suitable for the characteristics of ceramic materials and has high support efficiency per unit mass; the uniform distribution in the plane forms a continuous and regular flow channel, which is more suitable for integrated additive manufacturing.

[0051] The roller body 1 has a convection cooling cavity 11 at the shaft center inside, and a central hole 15 is provided at the shaft center at both ends of the roller body 1.

[0052] The roller body 1 is made of silicon nitride ceramic slurry, integrally formed by SLA / VPP photopolymerization 3D printing and high-temperature sintering. Silicon carbide, zirconium oxide, other high-strength, high-wear-resistant structural ceramic materials, and ceramic matrix composites can also be used. Integral molding avoids localized stress concentration at joint interfaces; it is suitable for manufacturing small-sized, highly complex, and enclosed internal structures. After molding, the outer diameter can be precision-machined to meet the roller's accuracy requirements. Other additive manufacturing processes suitable for complex and precise ceramic structures, injection molding combined with removable core molds, and integral molding processes for enclosing complex internal cavities can also be employed.

[0053] A gap 16 exists between the ends of the pumping blade 14 and the reinforcing rib 12. Inside the roller body 1, an annular structural layer 17 aligned with the gap 16 is formed on the outer periphery of the end of the convection cooling cavity 11. The thickness of the gap 16 and the annular structural layer 17 is 0.05mm to 0.15mm. This design aims to alleviate geometric interference between the rounded corners of the end face guide groove and the sharp corners of the honeycomb channels; improve the forming integrity of this area during ceramic 3D printing and high-temperature sintering; form a local buffer and flow collection area before the fluid enters the honeycomb channels; improve the uniformity of lubricant distribution to each honeycomb channel; and reduce the degree of local stress concentration at the interface. Furthermore, if the pumping blade 14 is in rigid contact with the reinforcing rib 12 and the convection cooling cavity 11, sharp corners are easily formed at the interface, which is detrimental to printing and forming. During sintering shrinkage, defects are easily induced locally, and stress concentration is more pronounced under high-speed loads, making it easy for fluid to deviate when entering each channel. Therefore, the gap 16 and the annular structural layer 17 are important innovative details that distinguish this patent from ordinary internal opening structures.

[0054] This patent is preferably applicable to rollers with an outer diameter D of 10mm~20mm and a roller length L of 0.8D~1.5D. The preferred values ​​are: D=14mm, L=14mm; shell wall thickness 1.2mm; honeycomb rib thickness 0.3mm; width-to-thickness ratio 12; hollowness 65%; 6 arc-shaped blades on each end face; and a microstructural fracture dimension of 0.1mm. For rollers of different sizes, the design can be scaled proportionally according to the outer diameter D. When the hollowness is below 60%, the weight reduction effect is not significant; when the hollowness is above 70%, the overall stiffness and local stability decrease; when the rib thickness is less than 0.015D, it is not conducive to ceramic forming and strength retention after sintering; when the rib thickness is greater than 0.03D, it will encroach on the internal flow channel space and increase the mass.

[0055] Example 2

[0056] See Figure 4A bearing includes an inner ring 21 and an outer ring 22 arranged coaxially, a plurality of roller bodies 1 circumferentially spaced and rolled between the inner ring 21 and the outer ring 22, and a cage 23 embedded between the inner ring 21 and the outer ring 22 and filling the spaces between adjacent roller bodies 1. The rolling placement of the roller bodies 1 between the inner ring 21 and the outer ring 22 allows the bearing to effectively and promptly dissipate the heat generated by rolling friction in ultra-high-speed operating conditions with a DN value greater than 4 million, while simultaneously reducing the heat transferred to the inner ring 21 and the outer ring 22, thereby improving the bearing's operating conditions and service life.

[0057] Example 3

[0058] See Figures 5-7 An experimental temperature measuring device includes an experimental support 31, a fixed drive assembly 32 for fixing and driving the bearing to rotate, an infrared temperature measuring probe 33 for infrared temperature measurement of the inner ring 21, the outer ring 22 and the roller body 1, and a wind drive assembly 34 disposed on both sides of the fixed drive assembly 32 to provide air with different flow rates through the convection cooling cavity 11.

[0059] The bearing is driven to rotate to a specified high speed by a fixed drive assembly 32. After a period of time, the temperature of the inner ring 21, outer ring 22, and roller body 1 is detected and recorded by an infrared temperature probe 33. Then, the bearing equipped with self-cooling ceramic cylindrical rollers is fixed in the fixed drive assembly 32, so that the fixed drive assembly 32 can drive the bearing to rotate at the same speed as a conventional bearing. At this time, the wind drive assembly 34 does not work and records the temperature of the inner ring 21, outer ring 22, and roller body 1 of the bearing. Then, the wind drive assembly 34 is started again, the air flow rate is gradually increased, and the temperature of the inner ring 21, outer ring 22, and roller body 1 of the bearing is recorded. This experimental temperature measuring device can measure the changes in bearing temperature, performance, and service life caused by the self-cooling ceramic cylindrical rollers under actual working conditions. At the same time, some parameters and designs of the self-cooling ceramic cylindrical rollers can be modified based on the experimental measurement results to obtain more suitable self-cooling ceramic cylindrical rollers.

[0060] The fixed drive assembly 32 includes two fixed sleeves 321 that are suspended and fixed to the experimental support 31 by bolts and are arranged coaxially at intervals; two auxiliary wheels 322 that are rotatably disposed between the two fixed sleeves 321 and abut against the lower side of the outer circumference of the outer ring 22; a drive wheel 323 that is rotatably disposed between the two fixed sleeves 321 and abut against the outer circumference of the outer ring 22 to drive the outer ring 22 to rotate; and fixed clamps 324 that are respectively disposed inside the two fixed sleeves 321 to fix the inner ring 21. A fixed interval is formed between the two fixed sleeves 321 for the coaxial insertion of bearings.

[0061] Two fixed sleeves 321 are coaxially and horizontally slidably connected to the upper end of the experimental support 31 and driven by a hydraulic cylinder.

[0062] A drive cylinder, which drives two auxiliary wheels 322 and a drive wheel 323 to move vertically, is fixed to the experimental support 31 by bolts. The drive wheel 323 is driven to rotate by a motor. This makes it easier to embed the bearings into the fixed interval, and also allows the fixed drive assembly 32 to drive different types of bearings, thereby enabling the experimental temperature measuring device to perform experimental temperature measurements on different types of bearings and rollers.

[0063] The infrared temperature probe 33 is inclined and embedded in the inner wall of the fixed sleeve 321 to align with the inner ring 21, the outer ring 22 and the roller body 1.

[0064] The fixing clamp 324 includes a clamping ring 3241 that slides along the axis of the fixing sleeve 321 and is connected inside the fixing sleeve 321, multiple clamping rods 3242 that are circumferentially evenly spaced and integrally connected to one end of the clamping ring 3241, and a clamping piece 3243 integrally disposed at the end of the clamping rods 3242 and bonded to the inner ring 21. The fixing sleeve 321 is provided with bolts that penetrate into the interior of the fixing sleeve 321 and abut against the clamping ring 3241.

[0065] The wind-driven assembly 34 includes a rotating frame 341 that is rotatably connected to two fixed sleeves 321 at opposite ends via rotating shafts, and a high-speed fan 342 fixed on the rotating frame 341. The two high-speed fans 342 rotate synchronously with the rotating frame 341 and are coaxially aligned with the fixed sleeves 321. The two high-speed fans 342 have the same air outlet direction and form a high-speed airflow inside the fixed sleeves 321.

[0066] The two high-speed fans 342 can be rotated to be coaxial with the fixed sleeve 321, thereby providing a more accurate and controllable high-speed airflow. At the same time, the high-speed fans 342 can be detached from the fixed sleeve 321 by rotating the frame 341, which means that temperature measurement can be performed when there are no high-speed fans 342, when there is a single high-speed fan 342, and when both high-speed fans 342 are working at the same time, which is more convenient.

[0067] In the description of this invention, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0068] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0069] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first and second features are in direct contact, or that they are in indirect contact through an intermediate medium. Furthermore, "above," "over," or "on top" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "beneath" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0070] In the description of this specification, the terms "one embodiment," "some embodiments," "embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0071] Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make modifications, alterations, substitutions and variations to the above embodiments within the scope of the present invention.

Claims

1. A self-cooling ceramic cylindrical roller characterized by: It includes a cylindrical roller body (1), and a plurality of convection cooling cavities (11) are formed inside the roller body (1) along its own axis. The plurality of convection cooling cavities (11) are evenly spaced along the circumferential axis of the roller body (1), and reinforcing ribs (12) are formed between adjacent convection cooling cavities (11). The roller body (1) has multiple pumping air holes (13) on both ends. The pumping air holes (13) on both ends of the roller body (1) are respectively arranged on both sides of the convection cooling cavity (11). Each pumping air hole (13) is connected to the corresponding convection cooling cavity (11). Multiple pumping air holes (13) are evenly spaced along the axis of the roller body (1) on the end face, and each pumping air hole (13) extends in an arc shape from the axis of the roller body (1) to the outer periphery on the end face. Pumping blades (14) are formed between adjacent pumping air holes (13). When the pumping blades (14) rotate with the roller body (1), they disturb the air, so that the air is drawn into the corresponding convection cooling cavity (11) from one end of the pumping air hole (13) and discharged from the other end of the pumping air hole (13).

2. The self-cooling ceramic cylindrical roller of claim 1, wherein: The cross-section of the convection cooling cavity (11) is regular hexagonal, and multiple convection cooling cavities (11) form a regular hexagonal honeycomb structure.

3. The self-cooling ceramic cylindrical roller of claim 1, wherein: The roller body (1) has a convection cooling cavity (11) at the center of the shaft, and a center hole (15) is provided at the center of the shaft on both ends of the roller body (1).

4. The self-cooling ceramic cylindrical roller of claim 1, wherein: The roller body (1) is a one-piece molded structure; The roller body (1) is made of silicon nitride ceramic.

5. The self-cooling ceramic cylindrical roller of claim 1, wherein: There is a gap (16) between the pumping blade (14) and the end of the reinforcing rib (12), and an annular structural fault (17) aligned with the gap (16) is formed inside the roller body (1) at the outer periphery of the end of the convection cooling cavity (11).

6. A bearing employing the self-cooled ceramic cylindrical roller of any one of claims 1-5, wherein: It includes an inner ring (21) and an outer ring (22) arranged coaxially, and a plurality of roller bodies (1) that are circumferentially spaced and rolled between the inner ring (21) and the outer ring (22).

7. An experimental temperature measuring device, characterized by: Used for experimental temperature measurement of the bearing described in claim 6; The experimental temperature measuring device includes a fixed drive assembly (32) for fixing and driving the bearing to rotate, an infrared temperature measuring probe (33) for measuring the infrared temperature of the inner ring (21), the outer ring (22) and the roller body (1), and a wind drive assembly (34) provided with air flowing through the convection cooling cavity (11) at different speeds and located on both sides of the fixed drive assembly (32).

8. The experimental temperature measuring device of claim 7, wherein: The fixed drive assembly (32) includes two fixed sleeves (321) arranged coaxially at intervals, two auxiliary wheels (322) rotatably disposed between the two fixed sleeves (321) and abutting against the lower side of the outer ring (22), a drive wheel (323) rotatably disposed between the two fixed sleeves (321) and abutting against the outer ring (22) to drive the outer ring (22) to rotate, and a fixing clamp (324) disposed inside the fixed sleeves (321) to fix the inner ring (21). A fixed interval is formed between the two fixed sleeves (321) for the bearing to be coaxially inserted.

9. The experimental temperature measuring device of claim 8, wherein: The two auxiliary wheels (322) are vertically slidably disposed on the lower side of the fixed sleeve (321), and the drive wheel (323) is vertically slidably disposed on the upper side of the fixed sleeve (321).

10. The experimental temperature measuring device as described in claim 7, characterized in that: The wind-driven assembly (34) includes a rotating frame (341) rotatably mounted on two sections of the fixed sleeve (321) at opposite ends, and a high-speed fan (342) fixed on the rotating frame (341). The two high-speed fans (342) rotate synchronously with the rotating frame (341) and are coaxially mounted on the fixed sleeve (321). The two high-speed fans (342) have the same air outlet direction and form a high-speed airflow inside the fixed sleeve (321).

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