Automatic gapless follow-up measuring device for inner diameter of bearing inner ring

Abstract

An automatic gapless follow-up measuring device for the inner diameter of a bearing inner ring comprises a base, a positioning mechanism, a lifting mechanism and a measuring mechanism. The positioning mechanism and the lifting mechanism are arranged on the base, and the measuring mechanism is arranged on the lifting mechanism; the measuring mechanism comprises a measuring rod sliding guide rail, measuring rods and a measuring rod pushing mechanism, the measuring rod sliding guide rail is provided with a gapless follow-up mechanism, the gapless follow-up mechanism is connected with the lifting mechanism, the two measuring rods are installed on the measuring rod sliding guide rail and connected with the measuring rod pushing mechanism, the measuring rod pushing mechanism is installed on the lifting mechanism, and the lifting mechanism is connected with the measuring rod sliding guide rail. And sensors are arranged on the two measuring rods. The positioning mechanism positions the bearing and drives the outer surface of the bearing to enable the bearing to rotate, the measuring rod pushing mechanism pulls the measuring rod to the middle, the lifting mechanism drives the measuring mechanism to descend into an inner hole of the bearing, the measuring rod makes contact with the inner diameter surface of the bearing, and the sensor collects data of one-circle rotation of the bearing. The device measures the inner diameter of the bearing in a gapless follow-up mode, and measured data are more real and accurate.

Description

Technical Field

[0001] This utility model relates to a device for measuring the inner diameter of a bearing inner ring, belonging to the field of bearing inner ring inner diameter measurement technology. Background Technology

[0002] For measuring the inner diameter of a bearing inner ring, the existing technology usually involves inserting a pneumatic plug gauge probe into the hole to be measured and determining the size of the hole diameter by measuring the pressure and flow rate changes of the pneumatic gauge.

[0003] This method of measuring the inner diameter is an average value over a certain area and cannot reflect the true condition of the bearing's inner surface. Furthermore, this type of probe is expensive, and the probe itself needs to be replaced when changing models. Utility Model Content

[0004] This invention addresses the shortcomings of existing bearing inner ring diameter measurement technology by providing an automatic, backlash-free follow-up measuring device for bearing inner ring diameter, enabling efficient and accurate measurement of bearing inner ring diameter.

[0005] The automatic backlash-free follow-up measuring device for the inner diameter of the bearing inner ring of this utility model adopts the following technical solution:

[0006] The device includes a base, a positioning mechanism, a lifting mechanism, and a measuring mechanism. The positioning and lifting mechanisms are both mounted on the base, while the measuring mechanism is mounted on the lifting mechanism. The measuring mechanism includes a probe sliding guide rail, a probe, a probe pushing mechanism, and sensors. A backlash-free follower mechanism is installed on the probe sliding guide rail and is connected to the lifting mechanism. There are two probes, both mounted on the probe sliding guide rail and connected to the probe pushing mechanism, which is mounted on the lifting mechanism. Sensors are installed on both probes.

[0007] The positioning mechanism includes a driving wheel, a driven wheel, and a driving wheel pushing mechanism. Two driven wheels are arranged around the periphery of the measurement position. The two driven wheels are fixedly mounted on the base via a rotating shaft. The driving wheel is mounted on the rotating shaft of a motor, which is mounted on the driving wheel pushing mechanism, which is also mounted on the base. The driving wheel pushing mechanism can be an existing moving mechanism such as a helical movement mechanism or an electric push rod. A soft layer is applied to the driving wheel to increase friction. Driven by the driving wheel pushing mechanism, the driving wheel moves, pushing the measured bearing into contact with the two driven wheels. Simultaneously, the motor drives the driving wheel to rotate, and the driving wheel then applies pressure to rotate the measured bearing.

[0008] The lifting mechanism adopts existing moving mechanisms such as a screw moving mechanism and an electric push rod.

[0009] The backlash-free follow-up mechanism consists of two spring plates arranged in parallel on the sliding guide rail of the measuring rod.

[0010] The probe pushing mechanism uses a probe closing cylinder, which is a double-acting cylinder with piston rods on both sides connected to a probe.

[0011] The sensor is an LVDT sensor.

[0012] After the bearing under test is pushed to the detection position, the positioning mechanism positions the bearing and drives the outer surface of the bearing to rotate. The measuring rod closing cylinder pulls the measuring rod to the middle, the lifting mechanism drives the measuring mechanism to descend into the inner hole of the bearing, and the measuring rod pushing mechanism opens the measuring rod to contact the inner diameter surface of the bearing. The sensor begins to collect data of one rotation of the bearing.

[0013] This invention employs a backlash-free, follow-up precision measurement method for bearing inner diameter, which differs from the method using pneumatic gauges to measure bearing inner diameter. It has the following advantages:

[0014] 1. The rotary positioning system consists of two passive wheels and one active wheel, which enables the bearing to rotate with a self-centering function. During measurement, the measuring rod always stays at the measurement center, resulting in more accurate and reliable measurement data.

[0015] 2. The measurement adopts a backlash-free follower mechanism, which makes the measuring rod move in the horizontal direction, completely eliminating the measurement error caused by the backlash of the moving pair.

[0016] 3. It adopts a double measuring rod and two-point contact measurement to provide a true, comprehensive and accurate reflection of the condition of the measured section. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the automatic backlash-free follow-up measuring device for the inner diameter of the bearing inner ring of this utility model.

[0018] Figure 2 This is a left view of the automatic backlash-free follow-up measuring device for the inner diameter of the bearing inner ring of this utility model.

[0019] Figure 3 This is a schematic diagram of the measurement process of this utility model. Wherein: (a) is the free state, (b) is the state before measurement, and (c) is the state during measurement.

[0020] The components are: 1. Inner ring of the bearing under test, 2. Driving wheel, 3. Driven wheel, 4. Measuring rod, 5. Sensor, 6. Backlash-free follow-up mechanism, 7. Servo lifting mechanism, 8. Base, 9. Measuring rod sliding guide rail, 10. Measuring rod closing cylinder. Detailed Implementation

[0021] This utility model relates to an automatic, backlash-free follow-up measuring device for the inner diameter of the bearing inner ring, such as... Figure 1 and Figure 2As shown, it includes a base 8, a positioning mechanism, a lifting mechanism 7, and a measuring mechanism. The positioning mechanism and the lifting mechanism 7 are both mounted on the base 8, and the measuring mechanism is mounted on the lifting mechanism 7.

[0022] The positioning mechanism includes a driving wheel 2, a driven wheel 3, and a driving wheel pushing mechanism. Two driven wheels 3 are provided, distributed around the periphery of the measurement position along with one driving wheel 2. The two driven wheels 3 are fixedly mounted on the base 8 via a rotating shaft, rotating only in their original position. The driving wheel 2 is mounted on the rotating shaft of a motor, which is mounted on the driving wheel pushing mechanism, which is located on the base 8. The driving wheel pushing mechanism can employ existing moving mechanisms such as a screw mechanism or an electric push rod. Driven by the driving wheel pushing mechanism, the driving wheel 2 moves, pushing the measured bearing into contact with the two driven wheels 3, positioning it within the driving wheel 2 and the two driven wheels 3. Simultaneously, the motor drives the driving wheel 2 to rotate, and the driving wheel 2 then applies pressure to rotate the measured bearing. A soft material layer can be applied to the driving wheel 2 to increase friction.

[0023] The lifting mechanism 7 is driven by a servo motor and can adopt existing moving mechanisms such as screw moving mechanism or electric push rod.

[0024] The measuring mechanism includes a probe sliding guide rail 9, a probe 4, a probe pushing mechanism, a sensor 5, and a backlash-free follower mechanism 6. The backlash-free follower mechanism 6 is mounted on the probe sliding guide rail 9 and is connected to the lifting mechanism 7. The backlash-free follower mechanism 6 consists of two parallel spring plates mounted on the probe sliding guide rail 9. Backlash-free follower mechanism differs from other mechanisms with backlash; shafts, guide rails, etc., all have backlash, and even small backlashes introduce errors. Backlash-free follower eliminates this error. It utilizes the spring characteristics of two parallel spring plates, allowing them to be simultaneously stressed, achieving parallel oscillation (followering) without backlash error, thus improving measurement accuracy. There are two probes 4, both mounted on the probe sliding guide rail 9 and connected to the probe pushing mechanism. The probe pushing mechanism is mounted on the lifting mechanism 7 and uses a probe closing cylinder 10. The probe closing cylinder 10 is a double-acting cylinder, with piston rods on both sides connected to one probe 4. The probe closing cylinder 10 can also be replaced by other mechanisms with bidirectional output ends, such as a bidirectional spiral movement mechanism. Sensors 5, which are LVDT sensors, are installed on both probes 4. The lifting mechanism 7 drives the backlash-free follow-up mechanism 6 and the probe sliding guide rail 9 to move up and down. Under the drive of the probe pushing mechanism, the two probes 4 move simultaneously in opposite directions on the probe sliding guide rail 9.

[0025] The process of measuring the inner diameter of the bearing inner ring using the above-mentioned device is as follows.

[0026] 1. Positioning and Rotation

[0027] The free states of the two measuring rods 4 are as follows Figure 3As shown in (a). After the inner ring 1 of the bearing under test is pushed to the test position, the driving wheel 2 moves forward into position under the drive of the driving wheel pushing mechanism and presses on the outer surface of the inner ring 1 of the bearing under test. The inner ring 1 of the bearing under test is positioned by two fixed driven wheels 3 and one driving wheel 2 that can move forward and backward. The three wheels are in close contact with the outer circular surface of the inner ring 1 of the bearing under test.

[0028] 2. Inspecting the inner diameter of the bearing inner ring.

[0029] After positioning is completed, the probe closing cylinder 10 is engaged. (See below) Figure 3 (b) This allows the two measuring rods 4 to extend into the inner hole of the inner ring 1 of the bearing being measured. The lifting mechanism 7 lowers the measuring mechanism to the measuring section, allowing the two measuring rods 4 to extend into the inner hole of the inner ring 1 of the bearing being measured. The measuring rod closing cylinder 10 opens, see [link to relevant documentation]. Figure 3 (C) Make the measuring points on the two measuring rods 4 contact the inner surface of the inner ring 1 of the bearing under test. Then, rotate the inner ring 1 of the bearing under test through the drive wheel 2. The sensor 5 starts to collect data. After the bearing rotates one revolution, the inner diameter, roundness and taper are calculated based on the data.

[0030] Inner diameter: X: Inner diameter; n: Number of data points collected; starting from the first data point, the values ​​are summed up up to the nth data point. Essentially, the average of the inner diameter data is calculated as the inner diameter of the measured part.

[0031] Roundness: Ro = (Xmax - Xmin) / 2; Xmax and Xmin are the maximum and minimum values ​​collected by sensor 5, respectively.

[0032] Taper: C = (X1 - X2) / L, which is the difference in the inner diameter of the two sections divided by the distance between the two sections.

Claims

1. An automatic gapless follow-up measuring device for the inner diameter of a bearing inner ring, characterized in that The utility model relates to a kind of measuring device, including base, positioning mechanism, lifting mechanism and measuring mechanism.Positioning mechanism and lifting mechanism are both arranged on base, and measuring mechanism is arranged on lifting mechanism;The measuring mechanism includes measuring rod sliding guide, measuring rod, measuring rod push mechanism and sensor, gapless follow-up mechanism is provided on measuring rod sliding guide, gapless follow-up mechanism is connected with lifting mechanism, measuring rod has two, and is all pivotally connected on measuring rod sliding guide and is connected with measuring rod push mechanism, measuring rod push mechanism is installed on lifting mechanism, and sensor is arranged on two measuring rods.

2. The apparatus of claim 1 wherein, The positioning mechanism includes driving wheel, passive wheel and driving wheel push mechanism, passive wheel is provided with two, two passive wheels and a driving wheel are distributed in the periphery of measuring position, two passive wheels are fixedly installed on base by pivot, driving wheel is installed on the pivot of motor, motor is installed on driving wheel push mechanism, and driving wheel push mechanism is arranged on base.

3. The apparatus of claim 2 wherein, The driving wheel push mechanism adopts screw moving mechanism and electric push rod.

4. The apparatus of claim 2 wherein, The driving wheel is laid with soft layer.

5. The apparatus of claim 1 wherein, The lifting mechanism adopts screw moving mechanism and electric push rod.

6. The apparatus of claim 1 wherein, The gapless follow-up mechanism is two spring leaves arranged in parallel on measuring rod sliding guide.

7. The apparatus of claim 1 wherein, The measuring rod push mechanism adopts measuring rod closed cylinder, and the piston rod of measuring rod closed cylinder is connected with one measuring rod.

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