Spindle bearing structure with integrated sensor

Abstract

The present invention provides a spindle bearing structure with integrated sensors. It includes a spindle, a plurality of bearing groups are sleeved on the spindle, a sleeve is sleeved on the outer sleeve of the spindle, and two ends of the sleeve are respectively connected to two end covers sleeved on the spindle, characterized in that a plurality of displacement sensors are respectively arranged in the two end covers, and at least one end cover is connected to an integrated sensor, and the integrated sensor includes an infrared temperature sensor, a contact temperature sensor, a tachometer and an accelerometer, the infrared temperature sensor corresponds to the inner ring of the bearing in the bearing group, and the contact temperature sensor corresponds to the outer ring of the bearing in the bearing group. The present invention is easy to install, disassemble and replace, and is convenient for testing the performance of the spindle and the bearing.

Description

Technical Field

[0001] The invention belongs to the technical field of bearings and relates to a spindle bearing structure with integrated sensors. Background Art

[0002] The applicant has previously applied for a spindle inclination testing mechanism [application number: 201821259384.9], which includes a spindle and a displacement sensor. There are two displacement sensors and they are arranged along the axial direction of the spindle. The displacement sensor corresponds to the outer wall of the spindle. A bearing assembly is provided on the spindle, and the two displacement sensors are located on both sides of the bearing assembly. The setting of the two displacement sensors can analyze the inclination of the spindle, so as to know the state of the bearing during operation. However, the displacement sensor is located at both ends of the bearing assembly, and several groups of bearing assemblies are usually arranged on the spindle, which results in more positions for the displacement sensors to be set. On the other hand, the displacement sensor is arranged in a cavity formed by the end cover and the spindle. The displacement sensor will change position during operation, resulting in inaccurate detection.

[0003] The applicant has previously applied for a detection mechanism for internal monitoring of the bearing seat [application number: 201821255614.4], which includes a detection plate sleeved outside the main shaft, the end of the main shaft is connected to an end cover, the detection plate is fixedly connected to the end cover, the detection plate is provided with a temperature sensor for detecting the temperature of the inner and outer rings of the bearing, and the detection plate is also provided with a displacement sensor for detecting the displacement of the main shaft. This invention can directly detect the temperature of the bearing in the working state. Compared with the prior art that determines the temperature of the bearing by detecting the temperature of the sleeve, the detection result is more accurate and reliable.

[0004] The applicant discovered in a large number of subsequent tests that the above patent had some shortcomings. A detection plate was used to connect the end cover, and a temperature sensor and other sensors were arranged on the detection plate. As a result, the entire sensor must rely on the detection plate to be installed on the main shaft and detect the bearing operation status. The detection plate was mounted outside the main shaft, which made the entire detection mechanism larger and inconvenient to install in a small space, thereby restricting the application performance of the detection mechanism. Summary of the invention

[0005] The object of the present invention is to provide a spindle bearing structure with integrated sensors in order to solve the above problems.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A spindle bearing structure with integrated sensors comprises a spindle, a plurality of bearing groups are sleeved on the spindle, a shaft sleeve is sleeved outside the spindle, two ends of the shaft sleeve are respectively connected to two end covers sleeved on the spindle, and the structure is characterized in that a plurality of displacement sensors are respectively arranged in the two end covers, at least one end cover is connected to an integrated sensor, the integrated sensor comprises an infrared temperature sensor, a contact temperature sensor, a tachometer and an accelerometer, the infrared temperature sensor corresponds to the inner ring of the bearing in the bearing group, and the contact temperature sensor corresponds to the outer ring of the bearing in the bearing group.

[0008] In the above-mentioned spindle bearing structure integrated with sensors, there are a plurality of displacement sensors in the end cover and they are evenly arranged at equal intervals along the circumference of the end cover.

[0009] In the above-mentioned spindle bearing structure integrated with sensors, the axis of the accelerometer is parallel to the axis of the spindle, the end of the displacement sensor faces the spindle and the axis of the displacement sensor is perpendicular to the axis of the spindle.

[0010] In the above-mentioned spindle bearing structure with integrated sensor, an infrared detection extension part is provided between the end cover connected with the integrated sensor and the bearing group, which is sleeved on the spindle and fixedly connected to the spindle. The end of the infrared detection extension part is connected to the inner ring of the bearing of the bearing group, and the infrared temperature sensor and the tachometer are facing the infrared detection extension part.

[0011] In the above-mentioned spindle bearing structure with integrated sensor, the infrared detection extension part is annular and coaxially arranged with the spindle, and the inner wall of the infrared detection extension part and the outer wall of the spindle are interference fit to fix the infrared detection extension part on the spindle.

[0012] In the above-mentioned spindle bearing structure with integrated sensor, a magnet is provided on the outer wall of the infrared detection extension part, the position of the magnet corresponds to the position of the tachometer, an outer ring heat-conducting component fixedly connected to the contact temperature sensor is provided in the sleeve, and the outer ring heat-conducting component is fixedly connected to the outer ring of the bearing of the bearing group.

[0013] In the above-mentioned spindle bearing structure with integrated sensors, the infrared temperature sensor, the contact temperature sensor, the tachometer and the accelerometer are fixed in the packaging box body, and the integrated sensor connected to the end cover is fixedly connected to the end cover through the packaging box body.

[0014] In the above-mentioned spindle bearing structure with integrated sensors, a PCB board is also provided inside the packaging box body, the infrared temperature sensor, the contact temperature sensor, the tachometer and the accelerometer are connected to the PCB board, the PCB board is connected to the wiring terminal, and the end of the wiring terminal away from the PCB board extends out of the packaging box body.

[0015] In the above-mentioned spindle bearing structure with integrated sensors, the packaging box body is formed by solidifying epoxy resin, the connection between the infrared temperature sensor, contact temperature sensor, tachometer and accelerometer and the PCB board is located in the packaging box body, and the connection between the terminal and the PCB board is also located in the packaging box body.

[0016] In the above-mentioned spindle bearing structure with integrated sensors, an integrated sensor is respectively provided on both sides of each bearing group.

[0017] Compared with the prior art, the advantages of the present invention are:

[0018] 1. The displacement sensor is set in the end cover. After the end cover is fixedly connected to the shaft sleeve, the position is fixed, so that the position of the displacement sensor is also fixed, and the detection accuracy can be guaranteed during long-term operation. Both end covers are equipped with displacement sensors, and the inclination of the spindle can be obtained by comparison to form an integrated detection body, which is convenient for installation, disassembly and replacement, and convenient for testing the performance of the spindle and bearings. Each sensor forms an integrated detection body, which is convenient for installation, disassembly and replacement, and convenient for testing the performance of the spindle and bearings.

[0019] 2. By adjusting the thickness of the infrared detection extension part, the distance between the inner ring of the bearing and the infrared temperature sensor can be effectively shortened, thereby improving the detection accuracy.

[0020] 3. Use packaging boxes to package each sensor, so that the connection point structure of the sensor is firm, thereby extending the service life and improving the detection accuracy.

[0021] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the present invention.

[0023] Figure 2 yes Figure 1 Schematic diagram of the other direction.

[0024] Figure 3 is Figure 1 AA section view.

[0025] Figure 4 is Figure 1 BB cross-sectional view.

[0026] Figure 5 yes Figure 2 EE cross-sectional view.

[0027] Figure 6 yes Figure 2 CC cross-sectional view.

[0028] Figure 7 is a schematic diagram of the integrated sensor.

[0029] Figure 8 It is a schematic diagram of the electrical connection between the PCB board and the sensor.

[0030] Fig. 9 is a schematic diagram of the connection between the end cap and the integrated sensor.

[0031] In the figure: spindle 1, bearing group 2, sleeve 3, end cover 4, displacement sensor 5, integrated sensor 6, infrared temperature sensor 7, contact temperature sensor 8, tachometer 9, accelerometer 10, infrared detection extension 11, outer ring heat conducting component 12, packaging box 13, PCB board 14, terminal 15, bearing inner ring 100, bearing outer ring 101, cover 102. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] like Figure 1 , Figure 2 , Figure 5 , Figure 6 and Fig. 9 As shown, a spindle bearing structure with integrated sensors includes a spindle 1, on which a plurality of bearing groups 2 are sleeved, the bearing groups 2 are formed by a plurality of bearings connected to each other, the spindle 1 is outerly provided with a sleeve 3, the bearing inner ring 100 is fixedly connected to the spindle 1, the bearing outer ring 101 is fixedly connected to the sleeve 3, the two ends of the sleeve 3 are respectively connected to two end covers 4 sleeved on the spindle 1, and there is a gap between the end cover 4 and the spindle 1 so as to be movably connected to the spindle.

[0034] As shown in Figures 3 and 4, a plurality of displacement sensors 5 are respectively provided in the two end covers 4. The displacement sensors 5 are used to detect the displacement of the spindle 1. Since there are two end covers and they are located on both sides of the spindle 1, the inclination of the spindle can also be detected by comparing the data of the displacement sensors 5 on the two end covers.

[0035] Since the end cover is non-contact with the main shaft 1 , the displacement sensor 5 can avoid interference with detection caused by vibration of the end cover during operation.

[0036] In this embodiment, in combination with FIG. 3 and Figure 5As shown, at least one end cover 4 is connected with an integrated sensor 6, the integrated sensor 6 includes an infrared temperature sensor 7, a contact temperature sensor 8, a tachometer 9 and an accelerometer 10, the infrared temperature sensor 7 corresponds to the inner ring of the bearing in the bearing group 2, the contact temperature sensor 8 corresponds to the outer ring of the bearing in the bearing group 2, and the infrared temperature sensor 7 and the contact temperature sensor 8 are used to detect the temperature of the inner ring and the outer ring of the bearing respectively. The tachometer 9 is used to detect the rotation speed of the spindle 1, and the accelerometer is used to detect the acceleration of the spindle.

[0037] It should be noted that, in this embodiment, since the infrared temperature sensor 7, the contact temperature sensor 8, the tachometer 9 and the accelerometer 10 are integrated together to form the integrated sensor 6, the overall volume of the integrated sensor 6 is reduced, which is conducive to installation in the end cover or the shaft sleeve.

[0038] Preferably, an integrated sensor 6 is provided on both sides of each bearing group 2. The infrared temperature sensor 7 and the contact temperature sensor 8 on each integrated sensor 6 respectively detect the temperatures of the inner ring and the outer ring of the bearing on both sides of the bearing group, and compare them to obtain the temperature difference of the bearings on both sides of each bearing group, which can reflect whether the bearings on the bearing group are working normally.

[0039] In this embodiment, there are a plurality of displacement sensors 5 in the end cover 4 and they are evenly spaced along the circumference of the end cover 4. Preferably, four displacement sensors 5 can be provided in each end cover 4, and two adjacent displacement sensors 5 are arranged perpendicular to each other. Specifically, a cavity for accommodating the displacement sensor 5 is provided in the end cover 4, and the displacement sensor 5 is inserted into the cavity and fixed to the end cover 4 with bolts.

[0040] The axis of the accelerometer 10 is parallel to the axis of the spindle 1, so that a wide-band detection range can be obtained. The end of the displacement sensor 5 faces the spindle 1 and the axis of the displacement sensor 5 is perpendicular to the axis of the spindle, so that the displacement sensor 5 obtains accurate displacement detection data.

[0041] An infrared detection extension part 11 is provided between the end cover 4 connected with the integrated sensor 6 and the bearing group 2, and is sleeved on the main shaft 1 and fixedly connected to the main shaft 1. The end of the infrared detection extension part 11 is connected to the inner ring of the bearing of the bearing group 2, and the infrared temperature sensor 7 and the tachometer 9 are facing the infrared detection extension part 11.

[0042] In the patent application number 201821255614.4 previously applied by the applicant, since the inner ring of the bearing is dynamic during operation and the temperature probe is static, the temperature probe usually adopts a commercially available infrared temperature sensor. Since the PCB board is arranged on the end cover and the infrared temperature sensor is arranged on the PCB board, two problems arise during installation. One is the correspondence between the infrared temperature sensor and the inner ring of the bearing. Accurate correspondence is required to reflect the temperature of the inner ring of the bearing. The other is that there is an installation distance between the infrared temperature sensor and the inner ring of the bearing. This installation distance is determined by the inner ring positioning ring that positions and fixes the inner ring of the bearing and cannot be effectively shortened. This distance causes a certain deviation in the detection result.

[0043] In this embodiment, in order to avoid the deviation of the detection result caused by the installation distance, the infrared detection extension part 11 is connected to the inner ring of the bearing. The infrared detection extension part 11 can shorten the distance between the infrared detection extension part 11 and the temperature sensor by increasing the thickness, thereby reducing the error range as much as possible. On the other hand, the infrared detection extension part 11 is directly connected to the inner ring of the bearing, and directly reflects the temperature of the inner ring of the bearing through heat conduction. The infrared detection extension part 11 can be an extension of the inner ring of the bearing 100 along the axial direction of the bearing, that is, the inner ring of the bearing close to the sensor is appropriately changed so that its end extends to the bottom of the infrared temperature sensor and corresponds to the sensor.

[0044] The infrared detection extension part 11 is annular and is coaxially arranged with the main shaft 1. The inner wall of the infrared detection extension part 11 and the outer wall of the main shaft 1 are interference fit so that the infrared detection extension part 11 is fixed on the main shaft 1. The end of the infrared detection extension part 11 is tightly fitted with the inner ring of the bearing to form heat conduction.

[0045] It should be noted that the inner ring heat-conducting component 5 can also be extended by the inner wall of the cover 102 which is screwed to the main shaft, but the disadvantage of this structure is that the cover 102 and the main shaft are screwed and fixed, and their coaxiality cannot be guaranteed during the screwing process, which will cause systematic errors in the subsequent detection process. The infrared detection extension part 11 is in the shape of a spacer ring, which can be completely consistent with the axis of the main shaft, avoiding the occurrence of systematic errors.

[0046] In this embodiment, the two ends of the infrared detection extension part 11 are respectively positioned by the inner ring of the bearing and a positioning sleeve or other components fixed on the main shaft, so that the infrared detection extension part 11 can be pressed against the inner ring of the bearing and fit with the inner ring of the bearing. The end face of the infrared detection extension part 11 close to the inner ring of the bearing is planar, which is convenient for forming a tight fit.

[0047] A magnet is provided on the outer wall of the infrared detection extension part 11, and the position of the magnet corresponds to the position of the tachometer 9. An outer ring heat-conducting component 12 fixedly connected to the contact temperature sensor 8 is provided in the sleeve 3, and the outer ring heat-conducting component 12 is fixedly connected to the outer ring of the bearing of the bearing group 2.

[0048] The end cover 4 or the sleeve 3 is also provided with an outer ring extension connected to the outer ring of the bearing, and the inner wall of the outer ring heat-conducting component 7 can be coated with heat dissipation paste, and then connected to the iron block and connected to the contact temperature sensor. When the main shaft rotates, the position of the magnet corresponds to the position of the tachometer, thereby realizing the detection of the rotation speed.

[0049] Combination Figure 7 and Figure 8 As shown, the infrared temperature sensor 7, the contact temperature sensor 8, the tachometer 9 and the accelerometer 10 are fixed in the packaging box 13, and the integrated sensor 6 connected to the end cover 4 is fixedly connected to the end cover 4 through the packaging box 13. The function of the packaging box is to integrate the detectors into one body for easy installation, removal and replacement.

[0050] The integrated sensor 6 can be fixed in the end cover or the shaft sleeve through the packaging box.

[0051] A PCB board 14 is also provided in the packaging box 13. The use of the PCB board for connection can make the circuit layout more compact, which is conducive to reducing the volume of the entire integrated sensor. The infrared temperature sensor 7, the contact temperature sensor 8, the tachometer 9 and the accelerometer 10 are connected to the PCB board 14, and the PCB board 14 is connected to the terminal 15. The terminal 15 extends out of the packaging box 13 at one end away from the PCB board 14.

[0052] A passage for passing the wiring terminal 15 is provided on the shaft sleeve or the end cover so that the wiring terminal 15 can be connected to an external device.

[0053] The packaging box body 13 is formed by solidifying epoxy resin. The connection between the infrared temperature sensor 7 , the contact temperature sensor 8 , the tachometer 9 and the accelerometer 10 and the PCB board 14 is located inside the packaging box body 13 . The connection between the terminal 15 and the PCB board 14 is also located inside the packaging box body 13 .

[0054] Specifically, the infrared temperature sensor 7, the contact temperature sensor 8, the tachometer 9 and the accelerometer 10 can be connected to the PCB board 14 first, and the printed circuits on the PCB board 14 are respectively connected to the terminals 15, and epoxy resin is poured onto the PCB board to encapsulate the connection, and the epoxy resin is solidified to form a packaging box. After the epoxy resin is solidified, each connection is fixed, so that the connection is stable, and the connection point will not be loosened during operation, thereby improving the reliability and service life of the detection.

[0055] The specific embodiments described herein are merely examples of the spirit of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in similar ways, but they will not deviate from the spirit of the present invention or exceed the scope defined by the appended claims.

[0056] Although the present invention uses more terms such as spindle 1, bearing assembly 2, sleeve 3, end cover 4, displacement sensor 5, integrated sensor 6, infrared temperature sensor 7, contact temperature sensor 8, tachometer 9, accelerometer 10, infrared detection extension 11, outer ring heat conducting component 12, packaging box 13, PCB board 14, terminal 15, bearing inner ring 100, bearing outer ring 101, cover 102, etc., it does not exclude the possibility of using other terms. These terms are used only to more conveniently describe and explain the essence of the present invention. It is contrary to the spirit of the present invention to interpret them as any additional restrictions.

Claims

1. A spindle bearing structure with integrated sensors, comprising a spindle (1), a plurality of bearing groups (2) being sleeved on the spindle (1), a shaft sleeve (3) being sleeved on the spindle (1), two ends of the shaft sleeve (3) being respectively connected to two end covers (4) sleeved on the spindle (1), characterized in that: A plurality of displacement sensors (5) are respectively arranged in the two end covers (4), and at least one end cover (4) is connected to an integrated sensor (6), wherein the integrated sensor (6) comprises an infrared temperature sensor (7), a contact temperature sensor (8), a tachometer (9) and an accelerometer (10), wherein the infrared temperature sensor (7) corresponds to the inner ring of the bearing in the bearing group (2), and the contact temperature sensor (8) corresponds to the outer ring of the bearing in the bearing group (2). There are a plurality of displacement sensors (5) in the end cover (4) and they are evenly spaced along the circumference of the end cover (4). An infrared detection extension part (11) is provided between the end cover (4) connected with the integrated sensor (6) and the bearing group (2), and is sleeved on the main shaft (1) and fixedly connected to the main shaft (1). The end of the infrared detection extension part (11) is connected to the inner ring of the bearing of the bearing group (2). The infrared temperature sensor (7) and the tachometer (9) face the infrared detection extension part (11). The axis center line of the accelerometer (10) is parallel to the axis center line of the main shaft (1), the end of the displacement sensor (5) faces the main shaft (1) and the axis center line of the displacement sensor (5) is perpendicular to the axis center line of the main shaft.

2. The sensor-integrated spindle bearing structure according to claim 1, characterized in that: The infrared detection extension part (11) is annular and is coaxially arranged with the main shaft (1). The inner wall of the infrared detection extension part (11) and the outer wall of the main shaft (1) are interference fit so that the infrared detection extension part (11) is fixed on the main shaft (1).

3. The sensor-integrated spindle bearing structure according to claim 2, characterized in that: A magnet is provided on the outer wall of the infrared detection extension part (11), and the position of the magnet corresponds to the position of the tachometer (9). An outer ring heat-conducting component (12) fixedly connected to the contact temperature sensor (8) is provided in the shaft sleeve (3), and the outer ring heat-conducting component (12) is fixedly connected to the outer ring of the bearing of the bearing group (2).

4. The spindle bearing structure with integrated sensor according to claim 1, characterized in that: The infrared temperature sensor (7), the contact temperature sensor (8), the tachometer (9) and the accelerometer (10) are fixed in the packaging box body (13), and the integrated sensor (6) connected to the end cover (4) is fixedly connected to the end cover (4) through the packaging box body (13).

5. The sensor-integrated spindle bearing structure according to claim 4, characterized in that: A PCB board (14) is also provided in the packaging box body (13); the infrared temperature sensor (7), the contact temperature sensor (8), the tachometer (9) and the accelerometer (10) are connected to the PCB board (14); the PCB board (14) is connected to a wiring terminal (15); and one end of the wiring terminal (15) away from the PCB board (14) extends out of the packaging box body (13).

6. The sensor-integrated spindle bearing structure according to claim 5, characterized in that: The packaging box body (13) is formed by solidifying epoxy resin, and the connection points between the infrared temperature sensor (7), the contact temperature sensor (8), the tachometer (9) and the accelerometer (10) and the PCB board (14) are located inside the packaging box body (13), and the connection point between the wiring terminal (15) and the PCB board (14) is also located inside the packaging box body (13).

7. The sensor-integrated spindle bearing structure according to claim 1, characterized in that: An integrated sensor (6) is respectively provided on both sides of each bearing group (2).

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