Bearing projection measuring equipment

Abstract

The invention relates to bearing protrusion measuring equipment which is mainly used for measuring the protrusion of a high-precision bearing. The device comprises a rack, a measuring frame, a bearing frame, a loading cylinder, a pressure bearing mechanism, a dense ball shaft system and a rotating structure. A loading air cylinder, a pressure bearing mechanism, a dense ball shaft system and a rotating structure are sequentially arranged in the bearing frame from bottom to top, and the power end of the loading air cylinder drives the pressure bearing mechanism, the dense ball shaft system and the rotating structure to move in the vertical direction. The pressure bearing mechanism comprises a force sensor and a pressure bearing plate, and the force sensor is arranged between the loading air cylinder and the pressure bearing plate and used for monitoring loading force in real time. The rotating structure comprises a driving motor and a rotating shaft system, the driving motor drives the rotating shaft system to rotate, and it is ensured that the bearing is evenly stressed in the measuring process. By optimizing the structural design, the problem of error accumulation caused by rotating friction of a main shaft of traditional equipment is solved, the measuring precision and repeatability are improved, and the device is suitable for measuring the protruding amount of a high-precision bearing.

Description

Technical Field

[0001] The present invention relates to the technical field of bearing measurement, and mainly relates to a bearing protrusion measurement device. Background Art

[0002] In modern industry, most high-precision shaft systems such as those in aerospace, precision machine tool spindles, high-speed motor spindles, and precision instrument shaft systems use angular contact ball bearings in pairs. Such bearings not only require high rotational speeds and high precision, but also require the shaft system to have high stiffness. To meet these requirements, it is necessary to accurately measure the protrusion of a single bearing under a certain preload. The protrusion is an important parameter of angular contact ball bearings, which not only affects the rotational accuracy, stiffness, vibration, and noise of the spindle, but also directly affects the life of the final shaft system.

[0003] Chinese Utility Model Patent with Application No. 201520761542.0 discloses a medium and small-sized angular contact bearing protrusion heavy-load measurement device, which drives a bearing tooling with a bearing to be measured to rise or fall through its piston spindle, and applies an axial preload to the bearing to be measured, and its accuracy meets the measurement requirements. However, it requires the operator to frequently rotate the spindle during the measurement process, and the equipment needs to be adjusted to compensate for the stroke when changing the model. At the same time, the structure of this patent makes there be a certain degree of error in the up and down movement of the spindle.

[0004] In the prior art, with the ultra-high production efficiency in the current bearing industry, when measuring the protrusion of a bearing, if the traditional method of rotating the spindle to eliminate the channel friction is adopted, it will undoubtedly bring great trouble to the operator. In addition, to adapt to different types of bearings, when changing the bearing, the operator also needs to manually adjust according to the equipment operation specifications to compensate for the equipment stroke problem caused by bearings with different widths; these operational troubles will indirectly or directly affect the production rhythm and production efficiency. Summary of the Invention

[0005] To solve the above technical problems, the present invention proposes a bearing protrusion measurement device.

[0006] The technical solution adopted by the present invention is: a bearing protrusion measurement device, including a frame. A measurement frame is provided above the frame. A bearing frame is provided at a position corresponding to the projection center of the measurement frame inside the frame. An air cylinder for loading, a pressure-bearing mechanism, a precision ball bearing system, and a rotating structure are sequentially arranged in the bearing frame from bottom to top. The lower part of the pressure-bearing mechanism is connected to the power end of the air cylinder for loading, and the precision ball bearing system is provided above it. The rotating structure is arranged in the precision ball bearing system. The power end of the air cylinder for loading drives the pressure-bearing mechanism, the precision ball bearing system, and the rotating structure to move in the vertical direction. A micrometer mechanism for measuring the protrusion of the bearing is also provided on the measurement frame, and its measurement end extends into the measurement frame and corresponds to the center of the rotating structure.

[0007] As a preferred solution, the pressure-bearing mechanism includes a force sensor and a pressure-bearing plate. An activity slot for the up-and-down movement of the bearing plate is provided on the bearing frame. The pressure-bearing plate is arranged inside the bearing frame and its two ends extend outside the bearing frame through the activity slot. The force sensor is arranged between the loading cylinder and the pressure-bearing plate. Positioning holes are provided at the two ends of the pressure-bearing plate extending outside the bearing frame. A number of guiding columns for restricting the sway of the pressure-bearing plate are provided outside the bearing frame inside the machine frame. One end of the guiding column is fixed inside the machine frame, and the other end passes through the positioning hole and is connected to the bearing plate. A number of mounting holes are provided around the force sensor, and bolts pass through the mounting holes and pass through the bearing plate to be connected to the bottom of the precision ball bearing system.

[0008] As a preferred solution, a positioning ring for positioning the bearing to be measured is further provided at the top end inside the measuring frame.

[0009] As a preferred solution, a pneumatic unit for controlling the loading cylinder is further provided inside the machine frame.

[0010] As a preferred solution, a display for displaying measurement data is further provided on the outer surface of the machine frame.

[0011] As a preferred solution, the rotating structure includes a driving motor and a rotating shaft system. The pressure-bearing mechanism and the precision ball bearing system together form a cavity for placing the rotating structure. The driving motor is arranged inside the cavity and is connected to the bearing mechanism. The rotating shaft system is arranged at the top of the cavity and extends into the measuring frame, and is connected to the power end of the driving motor through a rolling bearing.

[0012] As a preferred solution, mounting holes are further provided on the upper end surface of the rotating shaft system, and the mandrel for bearing the bearing to be measured is arranged on the upper end surface of the rotating shaft system through the mounting holes.

[0013] The beneficial effects of the present invention are as follows: Based on the deficiencies existing in the prior art, the present invention provides a bearing protrusion measurement device. Through optimized structural design, the present invention has the following technical effects: Firstly, through the synergistic effect of the force sensor and the guiding column in the pressure-bearing mechanism of the present invention, combined with the design of the driving motor and the rotating shaft system of the rotating structure, the problem of error accumulation caused by the rotation friction of the main shaft in the traditional measurement device is solved, the influence of raceway friction on the measurement accuracy is eliminated, and the accuracy and repeatability of the protrusion data are ensured.

[0014] Secondly, in the present invention, the rotating structure is composed of a driving motor and a rotating shaft system, is placed inside the precision ball bearing system and is connected to the pressure-bearing mechanism. Through the rigid constraint structure of the precision ball bearing system and the linear guiding column, the problem of sway caused by uneven force during the rotation of the shaft system is solved, the stability and rigidity of the shaft system during the measurement process are ensured, and the reliability of the measurement result and the service life of the device are further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0016] Figure 1 is a schematic structural diagram of the present invention; Figure 2 is a schematic structural diagram of the bearing frame part in the present invention; In the figure: 1, frame; 2, precision ball bearing system; 3, rotating shaft system; 4, driving motor; 5, measuring frame; 6, micrometer mechanism; 7, pneumatic unit; 8, loading cylinder; 9, force sensor; 10, positioning ring; 11, display; 12, mandrel; 13, bearing frame; 14, guide post. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] Hereinafter, the present invention will be specifically described by way of exemplary embodiments. However, it should be understood that, without further elaboration, the elements, structures, and features in one embodiment can also be beneficially combined with those in other embodiments.

[0018] It should be noted that: Unless otherwise defined, the technical terms or scientific terms used herein shall have the ordinary meanings understood by those of ordinary skill in the art to which the present invention pertains. The words such as "a", "an", or "the" used in the specification and claims of this patent application for the present invention do not express a limitation of quantity, but rather mean that there is at least one; the words such as "comprising" or "including" indicate that the elements or items appearing before "comprising" or "including" cover the elements or items listed after "comprising" or "including" and their equivalents, but do not exclude other elements or items having the same functions.

[0019] In order to more clearly describe the specific structural composition of the bearing protrusion measurement device, in combination with the attached Figure 1 - attached Figure 2 describe this embodiment: This embodiment provides a bearing protrusion measurement device, which includes a frame 1. Above the frame 1, there is a measurement frame 5. Inside the frame 1, there is a bearing frame 13. Inside the bearing frame 13, a loading cylinder 8, a pressure-bearing mechanism, a precision ball shafting 2 and a rotating structure are arranged in sequence from bottom to top. The lower part of the pressure-bearing mechanism is connected to the power end of the loading cylinder 8, and the precision ball shafting 2 is arranged above it. The rotating structure is arranged inside the precision ball shafting 2. The power end of the loading cylinder 8 drives the pressure-bearing mechanism, the precision ball shafting 2 and the rotating structure to move in the vertical direction, and uses the high rigidity of the precision ball shafting 2 to provide high-precision guidance for the ascending and descending actions.

[0020] In this embodiment, the pressure-bearing mechanism includes a force sensor 9 and a bearing plate. On the bearing frame 13, there is an activity slot for the up and down movement of the bearing plate. The bearing plate is arranged inside the bearing frame 13 and both ends extend outside the bearing frame 13 through the activity slot. The force sensor 9 is arranged between the loading cylinder 8 and the bearing plate. At both ends of the bearing plate extending outside the bearing frame 13, there are positioning holes. Inside the frame 1 and outside the bearing frame 13, there are several guide posts 14 for restricting the sway of the bearing plate. One end of the guide post 14 is fixed inside the frame 1, and the other end passes through the positioning hole and is connected to the bearing plate. There are several mounting holes around the force sensor 9, and bolts pass through the mounting holes and pass through the bearing plate to be connected to the bottom of the precision ball shafting 2.

[0021] In this embodiment, the measurement frame 5 is composed of a U-shaped measurement base and a planar measurement top plate; and a micrometer mechanism 6 is placed on the measurement top plate. The displacement sensor is placed inside the micrometer locking fixture. The micrometer handwheel drives the lead screw, and the displacement sensor can be adjusted at different positions in the waist slot of the measurement top plate to adapt to bearings in different ranges.

[0022] In this embodiment, a micrometer mechanism 6 for measuring the bearing protrusion is also arranged on the measurement frame 5. It is fixed to the top plate of the measurement frame 5 by bolts. The measurement end of the micrometer mechanism 6 extends into the measurement frame 5 and corresponds to the center of the rotating mechanism. At the top end inside the measurement frame 5, there is also a positioning ring 10 for positioning the bearing to be measured. The micrometer mechanism 6 is connected to the top plate of the measurement frame 5 by bolts. The position of the displacement sensor in the Z-axis direction can be roughly positioned through the locking bolt in the micrometer mechanism 6, and the fine adjustment screw in the micrometer mechanism 6 can also be adjusted for fine adjustment.

[0023] In this embodiment, a pneumatic unit 7 for controlling the loading cylinder 8 is also arranged inside the frame 1. The loading cylinder 8 is connected to the force sensor 9 by bolts; at this time, the solenoid valve of the pneumatic unit 7 can switch the direction to make the loading cylinder 8 perform ascending, loading and descending actions according to the preset control; the loading force is preset by the precision pressure regulating valve of the pneumatic unit 7.

[0024] Furthermore, a display 11 for showing measurement data is also provided on the outer surface of the frame 1. The values of the displacement sensor and the force sensor 9 in the micrometer mechanism 6 are displayed on the display 11 in real time by the data acquisition system and the host computer software. The rising-loading-rotating-measuring and outputting the measured protrusion value results of the measuring device are controlled by software presetting.

[0025] In this embodiment, the rotating structure includes a driving motor 4 and a rotating shaft system 3. The bearing mechanism and the precision ball shaft system 2 together form a cavity for placing the rotating structure. The driving motor 4 is arranged in the cavity and connected to the bearing mechanism. The rotating shaft system 3 is arranged at the top of the cavity and extends into the measuring frame 5, and is connected to the power end of the driving motor 4 by a rolling bearing with high precision and high axial stiffness. The mandrel 12 is connected to the rotating shaft system 3 through an installation hole with tolerance dimension requirements. The installation hole is located at the end face of the rotating shaft system 3. The bearing to be measured is placed on the upper end face of the mandrel 12, and the bearing to be measured is rotated through the mandrel 12.

[0026] In this implementation, the precision ball shaft system 2, the rotating shaft system 3 and the driving motor 4 together form a mechanism that can move up and down and rotate at the same time, and is placed in the U-shaped measuring seat. The force sensor 9 is connected to the precision ball shaft system 2. The precision ball shaft system 2 can only move up and down but cannot rotate through two fixed guide columns 14. The driving motor 4 is connected to the rotating shaft system 3. The mandrel 12 is placed on the end face of the rotating shaft system 3, and the bearing is placed on the mandrel 12. When the driving motor 4 works, the mandrel 12 drives the bearing to be measured to rotate under the drive of the driving motor 4.

[0027] In this embodiment, there is also a reference ring for calibrating the "zero position" of the sensor. The reference ring is placed on the mandrel 12 before the instrument is started, and the reference ring is removed after the instrument is calibrated, and the bearing to be measured is replaced for measurement.

[0028] During actual use, the bearing to be measured is placed on the upper end face of the rotating shaft system 3 and fixed through the mandrel 12. The pneumatic unit 7 is started, and the power end of the loading cylinder 8 is controlled to drive the bearing mechanism, the precision ball shaft system 2 and the rotating structure to move in the vertical direction to apply a preload to the bearing. During the loading process, the force sensor 9 monitors and feeds back the magnitude of the force in real time to ensure the accurate application of the preload. At the same time, the driving motor 4 drives the rotating shaft system 3 to rotate, so that the bearing can be evenly stressed during the measurement process, avoiding measurement errors caused by uneven local stress.

[0029] The measuring end of the micrometer mechanism 6 corresponds to the center of the rotating mechanism, and can accurately measure the protrusion of the bearing under the action of the preload. The positioning ring 10 is used to position the bearing to ensure the accuracy of the measurement. The display 11 displays the measurement data in real time, which is convenient for the operator to read and record.

[0030] The entire measurement process is as follows: Click the start button on the frame 1, and the loading cylinder 8 pushes the precision ball bearing shafting 2 to rise. Through software delay, this delay time should be set according to the action of the loading cylinder 8. For example, it is set to 2 seconds. After the loading cylinder 8 rises stably, it automatically switches to the loading state. The magnitude of the loading force is adjusted and controlled by the precision pressure regulating valve in the pneumatic unit 7. After the loading action is completed, a slight delay is performed according to the preset steps of the software. This delay time is set to 1 second, for example. After the delay, the drive motor 4 is started. The drive motor 4 drives the rotating shafting 3 to rotate the bearing under test through the mandrel 12 at a preset speed. After rotating 1 circle, the rotation stop and descent actions are automatically executed. While descending, the data acquisition system and the host computer software collect, display, and calculate the protrusion amount value of the current bearing under test under the current preload condition.

[0031] It should be noted that although the present invention has been described through the above embodiments, the present invention can also have many other embodiments. Without departing from the spirit and scope of the present invention, those skilled in the art can obviously make various corresponding changes and deformations to the present invention, but these changes and deformations should all fall within the scope protected by the appended claims of the present invention and their equivalents.

Claims

1. A bearing protrusion measurement device, comprising a frame (1), and a measurement frame (5) is provided above the frame (1), characterized in that, A bearing frame (13) is provided at a position corresponding to the projection center of the measurement frame (5) inside the frame (1). An air cylinder for loading (8), a pressure-bearing mechanism, a precision ball bearing system (2) and a rotating structure are successively arranged in the bearing frame (13) from bottom to top. The lower part of the pressure-bearing mechanism is connected to the power end of the air cylinder for loading (8), the precision ball bearing system (2) is arranged above it, and the rotating structure is arranged inside the precision ball bearing system (2). The power end of the air cylinder for loading (8) drives the pressure-bearing mechanism, the precision ball bearing system (2) and the rotating structure to move in the vertical direction. A micrometer mechanism (6) for measuring the protrusion of the bearing is further provided on the measurement frame (5), and its measurement end extends into the measurement frame (5) and corresponds to the center of the rotating structure.

2. The bearing protrusion measurement device according to claim 1, wherein The pressure-bearing mechanism includes a force sensor (9) and a pressure-bearing plate. An activity slot for the up and down movement of the bearing plate is provided on the bearing frame (13). The pressure-bearing plate is arranged inside the bearing frame (13), and both ends extend out of the bearing frame (13) through the activity slot. The force sensor (9) is arranged between the air cylinder for loading (8) and the pressure-bearing plate.

3. The bearing protrusion measurement device according to claim 2, characterized in that, Positioning holes are provided at both ends of the pressure-bearing plate extending out of the bearing frame (13). A number of guide posts (14) for restricting the sway of the pressure-bearing plate are provided outside the bearing frame (13) inside the frame (1). One end of the guide post (14) is fixed inside the frame (1), and the other end passes through the positioning hole and is connected to the bearing plate.

4. The bearing protrusion measurement device according to claim 3, wherein A number of mounting holes are provided around the force sensor (9). Bolts pass through the mounting holes and pass through the bearing plate and are connected to the bottom of the precision ball bearing system (2).

5. The bearing protrusion measurement device according to claim 1, characterized in that, The rotating structure includes a driving motor (4) and a rotating shaft system (3). The pressure-bearing mechanism and the precision ball bearing system (2) together form a cavity for placing the rotating structure. The driving motor (4) is arranged inside the cavity and is connected to the bearing mechanism. The rotating shaft system (3) is arranged at the top of the cavity and extends into the measurement frame (5), and is connected to the power end of the driving motor (4) through a rolling bearing.

6. The bearing protrusion measurement device according to claim 5, wherein, Mounting holes are further provided on the upper end surface of the rotating shaft system (3). The mandrel (12) for carrying the bearing to be measured is arranged on the upper end surface of the rotating shaft system (3) through the mounting holes.

7. A bearing protrusion measurement device according to claim 1, characterized in that, A micrometer mechanism (6) for measuring the protrusion of the bearing is further provided on the measurement frame (5). It is fixed on the top plate of the measurement frame (5) by bolts. The measurement end of the micrometer mechanism (6) extends into the measurement frame (5) and corresponds to the center of the rotating structure.

8. The bearing protrusion measurement device according to claim 1, wherein, A positioning ring (10) for positioning the bearing to be measured is further provided at the top end inside the measurement frame (5).

9. The bearing protrusion measurement device according to claim 1, characterized in that, A pneumatic unit (7) for controlling the air cylinder for loading (8) is further provided inside the frame (1).

10. The bearing protrusion measurement device according to claim 1, wherein, A display (11) for displaying measurement data is further provided on the outer surface of the frame (1).

Images