Detection equipment for measuring rotation precision of bearing inner ring

Abstract

The invention relates to the technical field of bearing detection, in particular to detection equipment for measuring the rotation precision of a bearing inner ring. Comprising a base frame; the limiting and supporting module is horizontally and fixedly arranged on the base frame, and the limiting and supporting module is provided with a plurality of supporting rods capable of supporting a bearing in the radial direction and a detection unit capable of dynamically detecting the supporting force of the supporting rods; the driving module is horizontally and fixedly arranged on the base frame and is in transmission connection with the limiting and supporting module; according to the invention, not only can the bearing be pre-positioned, but also the precision of the inner ring of the bearing can be pre-detected when the bearing is clamped.

Description

A testing device for measuring the rotational accuracy of the inner ring of a bearing. Technical Field

[0001] This invention relates to the field of bearing testing technology, specifically to a testing device for measuring the rotational accuracy of the inner ring of a bearing. Background Technology

[0002] In the field of bearing testing technology, testing equipment used to measure the rotational accuracy of the bearing inner ring is typically used to detect parameters such as radial runout, axial runout, or rotational deviation of the bearing inner ring during rotation, in order to evaluate the stability and accuracy level of the bearing under actual operating conditions. Existing testing equipment generally uses a support structure to install and position the bearing inner ring, and a drive mechanism to rotate the bearing inner ring relative to a testing reference, and then a measuring device collects the rotational state of the inner ring.

[0003] In existing technologies, the rotational accuracy of the bearing inner ring is a crucial indicator for evaluating bearing operational stability and performance during bearing manufacturing and quality inspection. This typically requires specialized testing equipment to measure parameters such as radial runout, axial runout, and roundness error of the bearing inner ring during rotation. Current testing equipment for measuring the rotational accuracy of bearing inner rings often employs a synchronous clamping structure to position and fix the bearing, ensuring a stable relative position between the bearing inner ring and the testing reference during inspection. However, existing synchronous clamping equipment usually only serves a fixing function during clamping and lacks the ability to detect and correct the clamping state of the bearing inner ring itself. If the bearing inner ring already has coaxiality deviation, tilting, or eccentricity issues during initial clamping, the clamping action itself may further amplify these deviations, introducing additional errors during the rotational inspection. These situations can easily lead to the accumulation of clamping error factors in the rotational accuracy data collected during inspection, thus affecting the accuracy and repeatability of the inspection results and hindering the effective assessment of the true rotational accuracy of the bearing inner ring. Summary of the Invention

[0004] To address the aforementioned problems, a testing device for measuring the rotational accuracy of bearing inner rings is provided. By proposing a device that can not only pre-position the bearing but also detect the offset of the bearing inner ring accuracy during bearing clamping, this solves the technical problem that when the bearing inner ring already has coaxiality deviation, tilt, or eccentricity during initial clamping, direct clamping and testing can easily amplify this deviation, causing additional errors in the rotational testing process of the bearing inner ring.

[0005] To address the problems of existing technologies, this invention provides a testing device for measuring the rotational accuracy of the inner ring of a bearing, comprising: a base frame; a limiting support module, horizontally fixedly mounted on the base frame, the limiting support module having multiple support rods capable of radially supporting the bearing and a testing unit capable of dynamically detecting the supporting force of the multiple support rods; and a drive module, horizontally fixedly mounted on the base frame and drively connected to the limiting support module.

[0006] Preferably, the limiting support module further includes a driven rod capable of driving the support rod to slide radially and a driving rod capable of driving the driven rod to move; the detection unit is hinged between the driven rod and the driving rod; the driving end of the driving rod is connected to the driving module in a transmission manner; when the driving rod axially approaches the driven rod, the driven rod radially expands outward, and when the driving rod axially moves away from the driven rod, the driven rod radially retracts inward.

[0007] Preferably, the limiting support module further includes a first guide cylinder capable of axially guiding the drive rod to reciprocate, a slider capable of radially guiding the support rod to slide, and a guide disk radially guiding the slider to slide; the front end of the driven rod is radially slidably disposed on the guide disk via the slider; the support rod is vertically rotatably disposed on the other side of the slider; and the guide disk is coaxially slidably disposed outside the drive rod.

[0008] Preferably, the limiting module further includes a limiting unit capable of elastically limiting the bearing; the limiting unit is coaxially fixedly disposed on the surface of the guide plate.

[0009] Preferably, the limiting unit consists of a limiting rod, a guide seat that can axially guide the limiting rod to slide, and a first spring that can elastically support the limiting rod; the first spring is coaxially disposed between the limiting rod and the guide seat, and its two ends abut against the limiting rod and the guide seat respectively.

[0010] Preferably, the detection module includes a second guide tube, a telescopic rod, a second spring, and an infrared rangefinder; the telescopic rod is coaxially slidably disposed within the second guide tube; the second spring is coaxially disposed within the second guide tube and abuts against the driving end of the telescopic rod; the infrared rangefinder is coaxially fixedly disposed within the second guide tube with its detection end facing the telescopic rod.

[0011] Preferably, the end of the telescopic rod is further screwed with an adjusting screw capable of adjusting the elastic pressure of the second spring.

[0012] Preferably, the drive module includes an electric push rod and a connecting frame; the electric push rod is horizontally fixed on the base frame via the connecting frame and its output shaft is fixedly connected to the drive end of the drive rod.

[0013] The advantages of this invention compared to the prior art are: 1. By setting up detection units that correspond one-to-one with each support rod, this invention enables the bearing to simultaneously acquire the force or displacement state of each support point during the clamping and supporting process. This allows for the identification of coaxial deviation or inner diameter deviation of the bearing inner ring in the clamping state before testing, thus avoiding the bearing from directly entering the rotational accuracy testing process when there is an initial deviation.

[0014] 2. By setting a limiting unit, the present invention enables the bearing to maintain a near-preset posture before the inner support, reducing the possibility of the bearing tilting or eccentricity in the early stage of the inner support. In conjunction with the subsequent inner support and testing process, it effectively reduces the interference of the clamping stage on the test results. Attached Figure Description

[0015] Figure 1 is a perspective view of a testing device used to measure the rotational accuracy of the inner ring of a bearing.

[0016] Figure 2 is a side view of a testing device used to measure the rotational accuracy of the inner ring of a bearing.

[0017] Figure 3 is a perspective view of a testing device used to measure the rotational accuracy of the inner ring of a bearing, with the drive module removed.

[0018] Figure 4 is a side view of a testing device used to measure the rotational accuracy of the inner ring of a bearing, with the drive module removed.

[0019] Figure 5 is a cross-sectional view of section AA in Figure 4.

[0020] Figure 6 is a magnified view of section B in Figure 5.

[0021] Figure 7 is a magnified view of section C in Figure 5.

[0022] Figure 8 is an exploded perspective view of a testing device used to measure the rotational accuracy of the inner ring of a bearing, with the drive module removed.

[0023] The following are the labels in the diagram: 1. Base frame; 2. Limiting support module; 21. Support rod; 22. Detection unit; 221. Second guide cylinder; 222. Telescopic rod; 223. Second spring; 224. Infrared rangefinder; 225. Adjusting screw; 23. Driven rod; 24. Drive rod; 25. First guide cylinder; 26. Slider; 27. Guide plate; 28. Limiting unit; 281. Limiting rod; 282. Guide seat; 283. First spring; 3. Drive module; 31. Electric push rod; 32. Connecting frame. Detailed Implementation

[0024] To further understand the features, technical means, and specific objectives and functions achieved by the present invention, the present invention will be described in further detail below with reference to the accompanying drawings and specific embodiments.

[0025] Referring to Figures 1 to 8: A testing device for measuring the rotational accuracy of the inner ring of a bearing includes: a base frame 1; a limiting support module 2, which is horizontally fixed on the base frame 1, the limiting support module 2 having multiple support rods 21 capable of providing radial support to the bearing and a testing unit 22 capable of dynamically detecting the supporting force of the multiple support rods 21; and a drive module 3, which is horizontally fixed on the base frame 1 and is connected to the limiting support module 2 in a transmission manner.

[0026] Before testing the inner ring rotation accuracy of a bearing, stable coaxial internal support positioning is required. At the start of the operation, an external power supply is connected to drive the drive module 3 into operation. The drive module 3 synchronously drives multiple support rods 21 to retract radially, pre-adjusting the inner diameter formed by the support rods 21 to a range compatible with the inner diameter of the bearing to be tested. Subsequently, the bearing to be tested is fitted onto the outside of the support rods 21, and the drive module 3 is driven again, causing the support rods 21 to synchronously expand radially. This provides uniform radial support to the bearing's inner ring, achieving coaxial internal support positioning of the bearing before testing.

[0027] During the process of multiple support rods 21 providing internal support to the bearing, detection units 22, which are set up one-to-one with each support rod 21, synchronously detect the force or displacement state of each support point. When there are significant differences or deviations in the detection data collected by the detection units 22 that exceed the preset range, it can be determined that the inner ring of the bearing has a large inner diameter deviation or coaxial deviation in the current clamping state, which does not meet the requirements of internal support consistency for subsequent rotational accuracy testing.

[0028] By introducing the detection unit 22 simultaneously during the bearing internal support process, the clamping and detection are carried out simultaneously. This allows for the identification of deviations introduced by the bearing inner ring itself or the clamping state before detection, thus preventing the bearing from entering the rotational accuracy detection process with deviations.

[0029] Referring to Figure 8: The limiting support module 2 further includes a driven rod 23 capable of driving the support rod 21 to slide radially and a driving rod 24 capable of driving the driven rod 23 to move; the detection unit 22 is hinged between the driven rod 23 and the driving rod 24; the driving end of the driving rod 24 is connected to the driving module 3 in a transmission manner; when the driving rod 24 axially approaches the driven rod 23, the driven rod 23 radially expands outward, and when the driving rod 24 axially moves away from the driven rod 23, the driven rod 23 radially retracts inward.

[0030] When multiple support rods 21 need to be radially extended to provide internal support for the bearing, only an external power supply is needed to drive the drive module 3. The drive module 3 drives the drive rod 24 to move axially toward the driven rod 23. The detection unit 22, which is hinged between the drive rod 24 and the driven rod 23, provides support to the driven rod 23 during the axial movement of the drive rod 24. This causes the driven rod 23 to gradually change its posture under the action of axial thrust, and drives the support rod 21 connected to it to simultaneously slide radially, thereby realizing the synchronous conversion of multiple support rods 21 from a contracted state to an extended state.

[0031] During the aforementioned internal support process, since the detection unit 22 is always involved in supporting the driven rod 23, when the data collected by multiple detection units 22 during the internal support process changes, the difference in the support state of each support rod 21 on the inner ring of the bearing can be reflected in real time, thereby achieving the immediate detection effect of the bearing during the internal support stage, rather than performing compensation judgment after clamping is completed.

[0032] By introducing the detection unit 22 into the drive and deployment mechanism, the support process itself becomes a detectable process, enabling real-time monitoring of the bearing's internal support status and reducing the possibility of secondary errors introduced during clamping.

[0033] Referring to Figures 3 and 8: the limiting support module 2 further includes a first guide cylinder 25 capable of axially guiding the drive rod 24 to reciprocate, a slider 26 capable of radially guiding the support rod 21 to slide, and a guide disk 27 radially guiding the slider 26 to slide; the front end of the driven rod 23 is radially slidably disposed on the guide disk 27 via the slider 26; the support rod 21 is vertically rotatably disposed on the other side of the slider 26; the guide disk 27 is coaxially slidably disposed outside the drive rod 24.

[0034] The first guide cylinder 25 is horizontally fixed on the base frame 1, and the drive rod 24 is coaxially slidably disposed inside the first guide cylinder 25, with its end fixedly connected to the drive end of the drive module 3. The rear end of the detection unit 22 is hinged to the front end of the drive rod 24, and the front end of the detection unit 22 is hinged to the driven rod 23 near the front end; the rear end of the driven rod 23 is hinged to the outer wall of the front end of the first guide cylinder 25.

[0035] When the drive rod 24 gradually approaches the driven rod 23 along the axial direction under the action of the drive module 3, the detection unit 22 moves synchronously with the drive rod 24 and gradually pushes the driven rod 23 during the continuous axial movement of the drive rod 24, causing the driven rod 23 to produce radial opening displacement at different angles under the hinge constraint, and finally driving multiple support rods 21 to expand radially synchronously until they expand to a support diameter that matches the inner diameter of the bearing to be detected and then stop.

[0036] Through the multi-point hinge and guiding cooperation between the drive rod 24, the detection unit 22 and the driven rod 23, the radial expansion process of the support rod 21 is controlled and stable, ensuring the continuity and repeatability of the support diameter adjustment.

[0037] Referring to Figure 4: The limiting module 2 also includes a limiting unit 28 that can elastically limit the bearing; the limiting unit 28 is coaxially fixedly disposed on the surface of the guide plate 27.

[0038] Before internally supporting the bearing under test, to ensure that the bearing maintains a preset posture throughout the internal support process, when fitting the bearing onto the outside of the multiple support rods 21, simply ensuring that the outer side of the bearing abuts against the limiting unit 28 allows for rapid posture pre-correction of the bearing, ensuring that the bearing is in a relatively stable initial posture during the fitting stage. This pre-correction method avoids the problem of uneven force on the support rods 21 due to posture deviation before internal support is completed, providing a stable prerequisite for subsequent internal support and testing.

[0039] The bearing assembly stage is pre-corrected by the limiting unit 28, which reduces the impact of the initial bearing attitude deviation on the consistency of the inner support.

[0040] Referring to Figure 3: The limiting unit 28 consists of a limiting rod 281, a guide seat 282 that can axially guide the limiting rod 281 to slide, and a first spring 283 that can elastically support the limiting rod 281; the first spring 283 is coaxially disposed between the limiting rod 281 and the guide seat 282 and its two ends abut against the limiting rod 281 and the guide seat 282 respectively.

[0041] During the bearing assembly process, when the axial side of the bearing abuts against the limiting rod 281 beforehand, the limiting rod 281 initially limits the bearing, allowing it to be assembled onto the multiple support rods 21 in a near-vertical state, and wait for the support rods 21 to perform internal support based on a preset horizontal reference. Simultaneously, since the limiting rod 281 and the guide seat 282 are elastically connected by a first spring 283, when the bearing tilts slightly due to changes in support force during internal support, the force exerted by the bearing on the limiting rod 281 can compress the first spring 283, causing the limiting rod 281 to retract autonomously, thereby avoiding rigid interference with the bearing's internal support process.

[0042] Referring to Figure 6: The detection module includes a second guide cylinder 221, a telescopic rod 222, a second spring 223, and an infrared rangefinder 224; the telescopic rod 222 is coaxially slidably disposed within the second guide cylinder 221; the second spring 223 is coaxially disposed within the second guide cylinder 221 and abuts against the driving end of the telescopic rod 222; the infrared rangefinder 224 is coaxially fixedly disposed within the second guide cylinder 221 and its detection end is oriented towards the telescopic rod 222.

[0043] When the drive rod 24 moves axially toward the support rod 21 under the drive of the drive module 3, the detection unit 22, as an intermediate support structure, provides tilt support to the driven rod 23, thereby adjusting the radial attitude of the driven rod 23. During the bearing internal support process, the telescopic rod 222 inside the detection unit 22 retracts under force and, in conjunction with the action of the second spring 223, forms a dynamic support for the driven rod 23.

[0044] Since the detection unit 22 is composed of a retractable second guide cylinder 221 and a telescopic rod 222, its support pressure can be quantitatively controlled by adjusting the screw 225. This allows the detection unit 22 to not only perform mechanical support during the support process, but also to work with the infrared sensor to dynamically detect and compare the support stroke and force at each support point.

[0045] The scalable detection unit 22 integrates the support process with the support force detection, enabling quantifiable monitoring of the support force and improving the reliability of the detection data.

[0046] Referring to Figure 6: The end of the telescopic rod 222 is also screwed with an adjusting screw 225, which can adjust the elastic pressure of the second spring 223.

[0047] When the internal support pressure needs to be adjusted according to different bearing specifications or different testing requirements, it is only necessary to drive the adjusting screw 225 to move. By changing the relative positional relationship between the adjusting screw 225 and the telescopic rod 222, the pre-compression amount of the second spring 223 is changed, thereby realizing the adaptive adjustment of the support elastic pressure of the testing unit 22.

[0048] The above method allows for matching of internal support pressure to bearings with different inner diameters or different testing accuracy requirements without changing structural components. It enables adjustable and parameterized control of the internal support pressure, improving the adaptability of the testing equipment to different bearing specifications.

[0049] Referring to Figure 2: The drive module 3 includes an electric push rod 31 and a connecting frame 32; the electric push rod 31 is horizontally fixed on the base frame 1 through the connecting frame 32 and its output shaft is fixedly connected to the drive end of the drive rod 24.

[0050] When it is necessary to adjust the radial contraction or expansion spacing between multiple support rods 21 as a whole, it is only necessary to connect an external power source to drive the electric push rod 31 to move. The output shaft of the electric push rod 31 extends or contracts, thereby driving the drive rod 24 to generate corresponding axial displacement, which in turn drives the driven rod 23 and multiple support rods 21 to move synchronously, so as to realize the radial spacing between multiple support rods 21 can be adjusted as needed.

[0051] This invention not only enables pre-positioning of bearings but also allows for pre-detection of the bearing's inner ring accuracy during the bearing clamping process.

[0052] The above embodiments only illustrate one or more implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of the present invention should be determined by the appended claims.

Claims

1. A testing device for measuring the rotational accuracy of a bearing inner ring, characterized in that, include: Base frame; A limiting support module is horizontally fixed on the base frame. The limiting support module is provided with multiple support rods that can provide radial support for the bearing and a detection unit that can dynamically detect the supporting force of the multiple support rods. A drive module is horizontally fixed on the base frame and is connected to the limiting support module for transmission.

2. The testing device for measuring the rotational accuracy of a bearing inner ring according to claim 1, characterized in that, The limiting support module also includes a driven rod capable of driving the support rod to slide radially and a driving rod capable of driving the driven rod to move; the detection unit is hinged between the driven rod and the driving rod; the driving end of the driving rod is connected to the driving module in a transmission manner; when the driving rod axially approaches the driven rod, the driven rod radially expands outward, and when the driving rod axially moves away from the driven rod, the driven rod radially retracts inward.

3. The testing device for measuring the rotational accuracy of a bearing inner ring according to claim 2, characterized in that, The limiting support module further includes a first guide cylinder capable of axially guiding the drive rod to reciprocate, a slider capable of radially guiding the support rod to slide, and a guide disk radially guiding the slider to slide; the front end of the driven rod is radially slidably disposed on the guide disk via the slider; the support rod is vertically rotatably disposed on the other side of the slider; the guide disk is coaxially slidably disposed outside the drive rod.

4. The testing device for measuring the rotational accuracy of a bearing inner ring according to claim 3, characterized in that, The limiting module also includes a limiting unit that can elastically limit the bearing; the limiting unit is coaxially fixedly disposed on the surface of the guide plate.

5. The testing device for measuring the rotational accuracy of a bearing inner ring according to claim 4, characterized in that, The limiting unit consists of a limiting rod, a guide seat that can axially guide the limiting rod to slide, and a first spring that can elastically support the limiting rod; the first spring is coaxially disposed between the limiting rod and the guide seat, and its two ends abut against the limiting rod and the guide seat respectively.

6. The testing device for measuring the rotational accuracy of a bearing inner ring according to claim 1, characterized in that, The detection module includes a second guide tube, a telescopic rod, a second spring, and an infrared rangefinder; the telescopic rod is coaxially slidably disposed within the second guide tube; the second spring is coaxially disposed within the second guide tube and abuts against the driving end of the telescopic rod; the infrared rangefinder is coaxially fixedly disposed within the second guide tube with its detection end facing the telescopic rod.

7. The testing device for measuring the rotational accuracy of a bearing inner ring according to claim 6, characterized in that, The end of the telescopic rod is also screwed with an adjusting screw that can adjust the elastic pressure of the second spring.

8. A testing device for measuring the rotational accuracy of a bearing inner ring according to claim 2, characterized in that, The drive module includes an electric push rod and a connecting frame; the electric push rod is horizontally fixed on the base frame via the connecting frame and its output shaft is fixedly connected to the drive end of the drive rod.

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