Rolling mill bearing inner diameter measuring device

Abstract

The utility model relates to the technical field of bearing measuring tools, in particular to a rolling mill bearing inner diameter measuring device. The utility model provides a rolling mill bearing inner diameter measuring device which comprises a standard verification block and a measuring scale mechanism, and the inner diameter of the standard verification block is the same as the inner diameter of a bearing to be measured corresponding to the standard verification block in a natural state. The measuring scale mechanism comprises a support, a measuring fixed head, a measuring movable head, a dial indicator, a swing measuring mechanism and a movable head vertical scale. The fixed measuring head is installed on the support, the movable measuring head is installed on the support in a sliding mode, and the dial indicator is installed on the fixed measuring head and located between the fixed measuring head and the movable measuring head. The rolling mill bearing inner diameter measuring device is short in time for measuring the inner diameter of the hot-charging bearing, can quickly measure the inner diameter of the hot-charging bearing, and is simple to operate and convenient to use.

Description

Technical Field

[0001] This utility model relates to the field of bearing measuring tools, specifically to a rolling mill bearing inner diameter measuring device. Background Technology

[0002] In the hot-fitting process of rolling mill bearings, accurate measurement of the bearing inner ring size is crucial to ensuring the assembly precision of the bearing and shaft. A proper interference fit guarantees the stability of the bearing during operation. Inaccurate inner ring measurement or an inappropriate interference fit can cause the bearing to loosen during operation, affecting the normal operation of the rolling mill and reducing product quality. For example, during hot rolling, a loose bearing may cause changes in the roll gap, resulting in the rolled steel not meeting thickness requirements. A proper interference fit also ensures the bearing's load-bearing capacity. Insufficient interference may cause the bearing to shift or rotate under load, reducing its service life; while excessive interference can make bearing installation difficult and may cause excessive internal stress, leading to premature fatigue failure. Accurate inner ring measurement helps avoid equipment failures caused by improper assembly. When the fit between the bearing inner ring and the shaft is incorrect, abnormal vibrations and noise may occur under high-speed and heavy-load conditions of the rolling mill. These abnormalities can accelerate the wear of other equipment components and may even lead to serious safety problems such as train accidents. In addition, proper assembly can ensure the heat dissipation performance of the bearing. If the inner ring is assembled too tightly, the grease inside the bearing will be unevenly distributed, affecting heat dissipation, causing the bearing temperature to be too high, which in turn leads to lubrication failure and ultimately damages the bearing.

[0003] Currently, the following two methods are commonly used for measurement during the hot mounting process of rolling mill bearings: First, measurement is performed using calipers or micrometers. However, measuring the inner diameter of a hot-mounted bearing with calipers or micrometers takes a long time, usually about 8 minutes. The inner ring of a hot-mounted bearing cools down quickly (about 1-2°C / minute), and the long measurement time increases the overall measurement and installation time, leading to shrinkage of the bearing inner ring, insufficient interference fit, and subsequent installation difficulties. Moreover, the use of calipers or micrometers requires a high level of experience from the workers.

[0004] Secondly, while advanced measurement methods such as laser scanning and infrared temperature compensation are advanced, they are easily affected by the on-site environment. The cost of purchasing and maintaining these instruments and equipment is high, and they are highly susceptible to environmental influences and measurement errors in the harsh environment of steel mills. Furthermore, these errors require more specialized methods for correction, making maintenance extremely difficult.

[0005] Therefore, designing a bearing inner diameter measuring tool that is easy to operate, has a short measurement time, and is low cost has become an urgent technical problem to be solved. Utility Model Content

[0006] (I) The problem to be solved by this utility model is: how to design a bearing inner diameter measuring tool that is simple to operate, has a short measurement time, and is low cost.

[0007] (II) Technical Solution

[0008] A rolling mill bearing inner diameter measuring device includes a standard calibration block and a measuring ruler mechanism, wherein the inner diameter of the standard calibration block is the same as the inner diameter of the bearing to be measured in its natural state.

[0009] The measuring scale mechanism includes a bracket, a fixed measuring head, a movable measuring head, a dial indicator, an oscillating measuring mechanism, and a vertical scale for the movable head; the fixed measuring head is mounted on the bracket, the movable measuring head is slidably mounted on the bracket, and the dial indicator is mounted on the fixed measuring head and located between the fixed measuring head and the movable measuring head;

[0010] The swing measuring mechanism includes a swing block, a vertical scale mounted on the swing block, and a horizontal scale mounted on the swing block; the swing block is rotatably mounted on the measuring scale via a rotating shaft, and the horizontal scale is located below the dial indicator;

[0011] The center of gravity of the swing measuring mechanism is offset from the axis of the rotation axis. In its natural state, the angle formed between the fixed head vertical scale and the support is an acute angle.

[0012] The moving head vertical scale is vertically mounted on the measuring moving head. Both the moving head vertical scale and the stationary head vertical scale have a contact head on the side that contacts the inner wall of the bearing to be measured. The distance between the measuring end of the dial indicator and the rotating shaft is equal to the distance between the contact head of the stationary head vertical scale and the rotating shaft.

[0013] According to one embodiment of the present invention, two measuring pads are also included, which are used to be placed on the upper surface of the bearing to be measured to support the measuring scale mechanism.

[0014] According to one embodiment of the present invention, the fixed-head vertical scale can move up and down relative to the swing block, and the moving-head vertical scale can move up and down relative to the measuring moving head.

[0015] According to one embodiment of the present invention, the fixed-head vertical scale is slidably mounted on the swing block in the vertical direction, and the fixed-head vertical scale is locked to the swing block by a locking member; the moving-head vertical scale is slidably mounted on the measuring moving head in the vertical direction, and the moving-head vertical scale is locked to the measuring moving head by a locking member.

[0016] According to one embodiment of the present invention, the swing block has a first side and a second side that are parallel to each other, and the swing block is provided with a mounting hole for mounting the rotating shaft, and the center of gravity of the swing block is lower than the mounting hole.

[0017] According to one embodiment of the present invention, the horizontal scale is vertically mounted on the first side of the swing block, and the distance between the fixed-head vertical scale and the second side is less than the distance between the fixed-head vertical scale and the rotation axis.

[0018] According to one embodiment of the present invention, the measuring head and the bracket are locked together by a locking member.

[0019] According to one embodiment of the present invention, the contact heads on both the moving head vertical scale and the fixed head vertical scale are hemispherical.

[0020] According to one embodiment of the present invention, a dial indicator mounting base is installed at one end of the measuring stationary head near the measuring moving head, and the dial indicator is mounted on the dial indicator mounting base and can slide relative to the dial indicator mounting base.

[0021] According to one embodiment of the present invention, the standard calibration block has a first inner surface and a second inner surface that are parallel to each other, and the distance between the first inner surface and the second inner surface is the same as the inner diameter of the bearing to be tested in its natural state.

[0022] The beneficial effects of this utility model are:

[0023] Compared with conventional measurement methods, the method of measuring the inner diameter of hot-mounted bearings using this rolling mill bearing inner diameter measuring device has the following advantages:

[0024] First, the actual measurement time for the inner diameter of hot-fitted bearings is very short, allowing for rapid measurement and avoiding bearing installation difficulties caused by bearing inner ring shrinkage and insufficient interference fit due to prolonged measurement time. Second, the operation is simple, easy for workers to learn and use, requiring little experience, and is convenient to use. Third, this rolling mill bearing inner diameter measuring device has high practicality, reliability, and low cost. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1A schematic diagram of the structure of the rolling mill bearing inner diameter measuring device provided in this embodiment of the utility model;

[0027] Figure 2 A front view of the measuring ruler mechanism provided in an embodiment of this utility model;

[0028] Figure 3 A top view of the measuring ruler mechanism provided in an embodiment of this utility model;

[0029] Figure 4 A schematic diagram of a dial indicator, dial indicator base, swing block, horizontal scale, and fixed-head vertical scale provided for embodiments of this utility model;

[0030] Figure 5 A structural diagram of another measuring ruler mechanism provided in an embodiment of this utility model;

[0031] Figure 6 The structural diagram of the measuring head and the vertical scale of the measuring head provided in the embodiment of this utility model.

[0032] Icons: 1. Standard calibration block; 2. Measuring pad; 3. Support; 301. Scale line; 4. Measuring fixed head; 5. Measuring moving head; 501. Connecting block; 502. Rectangular through hole; 6. Fixed head vertical scale; 601. Contact head; 7. Moving head vertical scale; 8. Swing block; 801. First side; 802. Second side; 9. Dial indicator; 10. Handle; 11. Rotating shaft; 12. Base; 121. Slide rod; 13. Slider; 14. First locking element; 15. Horizontal scale; 16. Second locking element. Detailed Implementation

[0033] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0034] like Figures 1-5 As shown, one embodiment of this utility model provides a rolling mill bearing inner diameter measuring device, including a standard calibration block 1 and a measuring ruler mechanism. The inner diameter of the standard calibration block 1 is the same as the inner diameter of the bearing to be measured in its natural state.

[0035] The measuring scale mechanism includes a bracket 3, a measuring fixed head 4, a measuring moving head 5, a dial indicator 9, an oscillating measuring mechanism, and a vertical scale 7 for the moving head; the measuring fixed head 4 is mounted on the bracket 3, the measuring moving head 5 is slidably mounted on the bracket 3, and the dial indicator 9 is mounted on the measuring fixed head 4 and located between the measuring fixed head 4 and the measuring moving head 5.

[0036] The swing measuring mechanism includes a swing block 8, a vertical scale 6 mounted vertically on the swing block 8, and a horizontal scale 15 mounted horizontally on the swing block 8; the swing block 8 is rotatably mounted on the measuring head 4 via a rotating shaft 11, and the horizontal scale 15 is located below the dial indicator 9.

[0037] The center of gravity of the swing measuring mechanism is offset from the axis of the rotation axis 11. In its natural state, the angle formed between the fixed head vertical scale 6 and the support 3 is an acute angle.

[0038] The moving head vertical scale 7 is vertically mounted on the measuring moving head 5. Both the moving head vertical scale 7 and the fixed head vertical scale 6 have a contact head 601 on the side that contacts the inner wall of the bearing to be measured. The distance between the measuring end of the dial indicator 9 and the rotating shaft 11 is equal to the distance between the contact head 601 of the fixed head vertical scale 6 and the rotating shaft 11.

[0039] It should be noted that different sizes of bearings require the fabrication of different sized standard calibration blocks 1. The inner diameter of the standard calibration block 1 is the same as the inner diameter of the bearing to be measured in its natural state. Moreover, the standard calibration block 1 is manufactured by a professional measuring tool manufacturer according to the bearing's inner diameter and is calibrated by a quality inspection agency. The error accuracy between the inner diameter of the standard calibration block 1 and the corresponding bearing inner diameter is ≤ ±4μm.

[0040] In some embodiments, standard check block 1 is as follows: Figure 1 As shown, the standard calibration block 1 has a U-shaped profile and has a first inner surface 101 and a second inner surface 102 that are parallel to each other. The distance between the first inner surface 101 and the second inner surface 102 is the same as the specified inner diameter of the bearing to be measured. That is, the standard calibration block 1 is manufactured according to the bearing inner diameter specified in the bearing's instruction manual, ensuring that the accuracy error between the distance between the first inner surface 101 and the second inner surface 102 and the specified inner diameter of the bearing to be measured is within ±4μm.

[0041] In this embodiment, when using this mill bearing inner diameter measuring device to detect the inner diameter of a hot-fitted bearing, the distance between the measuring moving head 5 and the measuring stationary head 4 is first adjusted according to the inner diameter of the standard calibration block 1. This ensures that the distance between the stationary head vertical scale 6 and the moving head vertical scale 7 is slightly smaller than the inner diameter of the standard calibration block 1 (this step can be observed visually by the operator). This ensures that the stationary head vertical scale 6 and the moving head vertical scale 7 can smoothly extend into the standard calibration block 1. Then, the mill bearing inner diameter measuring device is placed on the top surface of the standard calibration block 1, and the stationary head vertical scale 6 and the moving head vertical scale 7 are extended into the standard calibration block 1. Then, the measuring device is positioned towards the side where the measuring moving head 5 is located (i.e.,...). Figure 1(From the left side) Gently push the bracket 3 so that the contact head 601 on the left side of the moving head vertical scale 7 comes into contact with the first inner surface 101 of the standard calibration block 1. At the same time, the swing measuring mechanism rotates counterclockwise by a small angle around the axis of rotation 11 under its own gravity, thereby driving the fixed head vertical scale 6 and the horizontal scale 15 to rotate counterclockwise by a small angle until the contact head 601 of the fixed head vertical scale 6 abuts against the second inner surface 102 of the standard calibration block 1. At this time, the dial indicator 9 displays a reading, and then the operator zeroes the dial indicator 9. This step is performed before the bearing is heated and is a preparatory step.

[0042] The specific operating steps for measuring the inner diameter of a heated bearing are as follows: Place the bearing inner diameter measuring device of this rolling mill on the heated bearing to be measured (hereinafter referred to as the hot-mounted bearing). Due to the thermal expansion of the hot-mounted bearing, its inner diameter is definitely larger than that of the standard calibration block 1. Therefore, the fixed head vertical scale 6 and the moving head vertical scale 7 can definitely be inserted into the interior of the hot-mounted bearing. Then, the measuring personnel gently push the bracket 3 towards the side where the moving head 5 is located so that the contact head 601 on the left side of the moving head vertical scale 7 is in contact with the inner wall of the hot-mounted bearing. Since there is a gap between the contact head 601 of the fixed head vertical scale 6 and the inner wall of the hot-mounted bearing, the swing measuring mechanism rotates counterclockwise by a small angle around the axis of the rotating shaft 11 under its own gravity, thereby driving the fixed head vertical scale 6 and the horizontal scale 15 to rotate counterclockwise by a small angle until the contact head 601 of the fixed head vertical scale 6 touches the second inner surface 102 of the standard calibration block 1. Then, the measuring personnel read the value of the dial gauge 9. Thus, the inner diameter of the heat-fitted bearing is the sum of the absolute values ​​of the inner diameter of standard calibration block 1 and the value of dial indicator 9.

[0043] It should be noted that the difference in inner diameter of the bearing before and after heating is usually within 2mm (the coefficient of expansion of bearing steel is approximately 11×10). -6 / ℃). In this embodiment, as Figure 4As shown, the distance a between the axis of the rotating shaft 11 and the center of the contact head 601 of the vertical scale 6 is required to be equal to the distance b between the axis of the rotating shaft 11 and the bottom measuring end of the dial indicator 9. After placing the mill bearing inner diameter measuring device on the heated bearing to be measured, the measuring personnel gently push the bracket 3 towards the side where the measuring moving head 5 is located, so that the contact head 601 on the left side of the moving head vertical scale 7 is in contact with the inner wall of the hot-mounted bearing. At this time, the gap between the contact head 601 of the fixed head vertical scale 6 and the inner wall of the hot-mounted bearing is ≤2mm. That is, the angle of the entire swing measuring mechanism rotating counterclockwise around the rotating axis 11 is very small. Therefore, the rotational motion of the contact head 601 can be approximately regarded as horizontal motion, and the rotational motion of the horizontal scale 15 can be regarded as lifting motion. Since the distance a between the axis of the rotating axis 11 and the center of the contact head 601 of the fixed head vertical scale 6 is equal to the distance b between the axis of the rotating axis 11 and the bottom measuring end of the dial indicator 9, the horizontal displacement of the contact head 601 of the fixed head vertical scale 6 can be approximately regarded as equal to the vertical displacement of the horizontal scale 15. Experimental calculations show that the error between the horizontal displacement of the contact head 601 of the fixed vertical scale 6 and the vertical displacement of the horizontal scale 15 is less than 0.01 mm.

[0044] It is evident that, compared to previous measurement methods, using this rolling mill bearing inner diameter measuring device to measure the inner diameter of hot-mounted bearings has the following advantages:

[0045] First, the actual measurement time for the inner diameter of hot-fitted bearings is very short, allowing for rapid measurement and avoiding bearing installation difficulties caused by bearing inner ring shrinkage and insufficient interference fit due to prolonged measurement time. Second, the operation is simple, easy for workers to learn and use, requiring little experience, and is convenient to use. Third, this rolling mill bearing inner diameter measuring device has high practicality, reliability, and low cost.

[0046] It should be noted that the dial indicator 9 works by using the meshing of a rack and pinion to convert the linear motion of the measuring rod into the rotational motion of the pointer, thus displaying the measured value on the dial. Normally, when the measuring end (measuring rod) of the dial indicator 9 is subjected to pressure and moves downwards, the gear transmission mechanism drives the pointer to rotate clockwise, displaying a positive value; conversely, when the measuring end retracts (i.e., the measuring rod moves upwards), the pointer rotates counterclockwise, displaying a negative value.

[0047] It should be noted that in the past, when using calipers or micrometers to measure the inner diameter of hot-mounted bearings, the high temperature of the hot-mounted bearings and the direct contact between the calipers or micrometers and the bearings caused thermal deformation of the calipers or micrometers, which in turn led to measurement errors.

[0048] The mill bearing inner diameter measuring device in this embodiment also includes two measuring pads 2. The measuring pads 2 are made of low thermal conductivity ceramic material, which serves to isolate heat conduction. The two measuring pads 2 are of the same height, and the height error of the measuring pads 2 is within 0.01 mm, so as to ensure that the two measuring pads 2 are of the same height as much as possible. In addition, the contact head 601 on the moving head vertical scale 7 and the contact head 601 on the fixed head vertical scale 6 are made of materials with low thermal expansion coefficient (such as carbon fiber). The moving head vertical scale 7 and the fixed head vertical scale 6 are made of carbon fiber to reduce their own thermal deformation.

[0049] When using this mill bearing inner diameter measuring device to measure the inner diameter of a hot-mounted bearing, two measuring pads 2 can be placed on the top surface of the hot-mounted bearing along its diameter direction, and then the mill bearing inner diameter measuring device can be placed on the two measuring pads 2. The purpose of the measuring pads 2 is to prevent the support 3 from directly contacting the hot-mounted bearing over a large area, thereby greatly reducing the measurement error caused by the thermal deformation of the measuring tool.

[0050] Furthermore, during the measurement process, only the contact head 601 on the moving head vertical scale 7 and the contact head 601 on the fixed head vertical scale 6 directly contact the inner diameter of the hot-mounted bearing. This results in a very small contact area between the bearing inner diameter measuring device and the hot-mounted bearing. Moreover, the moving head of the moving head vertical scale 7, the contact head 601 on the moving head vertical scale 7, and the contact head 601 on the fixed head vertical scale 6 are all made of materials with a low coefficient of thermal expansion. Ultimately, this greatly reduces the measurement error caused by the thermal deformation of the measuring tool and improves the measurement accuracy.

[0051] In some embodiments, the standard verification block 1 is made of stainless steel, which has excellent hardness, corrosion resistance and physical stability, such as 304 stainless steel.

[0052] To prevent the contact heads 601 on the moving head vertical scale 7 and the stationary head vertical scale 6 from scratching the bearing inner diameter during measurement, in this embodiment, both the contact heads 601 on the moving head vertical scale 7 and the stationary head vertical scale 6 are plated with hard chrome or ceramic coatings (such as ZrO2). 2 Therefore, it can avoid scratching the inner ring of the bearing during measurement (especially for finely ground surfaces with a surface roughness Ra≤0.8μm), and at the same time prevent iron filings from sticking together and affecting the reading.

[0053] In some embodiments, such as Figure 2 and Figure 4As shown, the contact head 601 on the moving head vertical scale 7 and the contact head 601 on the fixed head vertical scale 6 are both hemispherical. In this way, the contact head 601 on the two scales is in point contact with the inner wall of the heat-fitted bearing, and the contact area is very small. Therefore, the contact area between the measuring device and the heat-fitted bearing can be reduced to the greatest extent, and the measurement error caused by the thermal deformation of the measuring tool can be reduced.

[0054] In this embodiment, the fixed-head vertical scale 6 is mounted on the swing block 8 and can move up and down, while the movable-head vertical scale 7 is mounted on the measuring movable head 5 and can move up and down. This arrangement is intended to enable the measuring device to measure the inner diameter of heat-fitted bearings at different depths.

[0055] In some embodiments, such as Figure 4 As shown, a first mounting hole adapted to the fixed head vertical scale 6 is vertically formed on the swing block 8. The fixed head vertical scale 6 is slidably installed in the first mounting hole. A threaded hole communicating with the first mounting hole is formed on the front of the swing block 8. A second locking member 16 is installed in the threaded hole. The fixed head vertical scale 6 can be locked onto the swing block 8 by the second locking member 16. Specifically, the second locking member 16 can be any one of a screw, bolt, or bolt.

[0056] In this embodiment, as Figure 1 and Figure 2 As shown, the upper surfaces of the measuring fixed head 4 and the measuring moving head 5 are located in the same horizontal plane, and the vertical scale 7 of the moving head and the vertical scale 6 of the fixed head are exactly the same.

[0057] In addition, a connecting block 501 is provided on the top surface of the measuring head 5. A second mounting hole adapted to the vertical scale 7 of the measuring head is vertically opened on the connecting block 501 and the measuring head 5. The second mounting hole vertically passes through the connecting block 501 and the measuring head 5. The vertical scale 7 of the measuring head is slidably installed in the second mounting hole. A threaded hole is opened on the front side of the connecting block 501. A first locking member 14 is installed in the threaded hole. The first locking member 14 is used to lock the vertical scale 7 of the measuring head onto the measuring head 5. The first locking member 14 can be any one of a screw, bolt, or bolt.

[0058] like Figure 2 As shown, a rectangular through hole 502 is provided on the front side of the connecting block 501. This rectangular through hole 502 is lower than the threaded hole on the connecting block 501, and the rectangular through hole 502 communicates with the second mounting hole inside the connecting block 501. It should be noted that the inner bottom wall of this rectangular through hole 502 is at the same level as the upper surface of the measuring moving head 5. From Figure 6 As can be seen from the front of the measuring head 5, the vertical scale 7 of the moving head inside the connecting block 501 is visible.

[0059] Since the upper surfaces of the measuring stationary head 4 and the measuring moving head 5 are located on the same horizontal plane, and the vertical scales 7 and 6 of the moving head and the stationary head are identical, when adjusting the height of the vertical scales 7 and 6, the first locking piece 14 on the connecting block 501 can be loosened first, and then the height of the vertical scale 7 can be manually adjusted to a suitable height. Next, the first locking piece 14 should be tightened, and then the specific value A of the upper surface of the measuring moving head 5 falling within the vertical scale 7 can be observed from the front of the bracket 3. Then, the second locking piece 16 on the swing block 8 should be loosened, and the height of the vertical scale 6 can be manually adjusted until the specific value B of the upper surface of the measuring stationary head 4 falling within the vertical scale 6 is the same as A. Finally, the second locking piece 16 should be tightened. This allows the vertical scales 7 and 6 to be adjusted to the same height.

[0060] In this embodiment, as Figure 1 As shown, a locking element, such as a bolt or screw, is threaded onto the front of the measuring head 5. This locking element can be used to lock the measuring head 5 onto the bracket 3.

[0061] In this embodiment, as Figure 2 As shown, a dial indicator mounting base is installed on the top of the measuring head 4. This mounting base includes a connected base 12 and at least one slide rod 121. The base 12 is fixedly mounted on the top of the measuring head 4 using screws. The slide rod 121 is horizontally fixedly mounted on the base 12 and extends towards the measuring moving head 5. A slider 13 is slidably mounted on the slide rod 121 and locked to the slide rod 121 using a locking device. A dial indicator 9 is mounted on the slider 13, and the measuring end of the dial indicator 9 passes through the slider 13.

[0062] In this embodiment, the swing block 8 has a first side surface 801 and a second side surface 802 that are parallel to each other. A horizontal scale 15 is vertically mounted on the first side surface 801. The center of gravity of the swing block 8 is lower than the first mounting hole, and the distance between the center of gravity of the swing block 8 and the bottom surface of the swing block 8 is less than the distance between the center of gravity of the swing block 8 and the top surface of the swing block 8. That is, the center of gravity of the swing block 8 is close to the lower right side of the swing block 8, so that the swing block 8 can rotate around the axis of the rotation axis 11 under its own gravity.

[0063] It should be noted that the swing block 8 can be made of metals of different densities, as long as it can rotate around the axis of the rotation axis 11 under its own gravity. The shape of the swing block 8 is not specifically limited.

[0064] Furthermore, the horizontal scale 15 is vertically mounted on the first side 801 of the swing block 8, and the distance between the fixed head vertical scale 6 and the second side 802 is less than the distance between the fixed head vertical scale 6 and the rotation axis 11.

[0065] It should be noted that in this embodiment, since the height of the fixed-head vertical scale 6 is adjustable, and the horizontal position of the dial indicator 9 is also adjustable, the distance 'a' between the axis of the rotating shaft 11 and the center of the contact head 601 of the fixed-head vertical scale 6 is adjustable, and the distance 'b' between the axis of the rotating shaft 11 and the measuring end of the dial indicator 9 is adjustable. Furthermore, the vertical distance 'c' between the center of the contact head 601 on the fixed-head vertical scale 6 and the axis of the rotating shaft 11 can be observed using the fixed-head vertical scale 6. The horizontal distance 'd' between the axis of the rotating shaft 11 and the center of the contact head 601 can be measured in advance using a measuring tool. Since the triangle formed by a, d, and c is a right triangle, the distance 'a' between the axis of the rotating shaft 11 and the center of the contact head 601 of the fixed-head vertical scale 6 can be calculated using d and c.

[0066] In this embodiment, the distance e between the axis of the rotating shaft 11 and the upper surface of the horizontal scale 15 and the horizontal distance d between the axis of the rotating shaft 11 and the center of the contact head 601 are equal. Therefore, as long as the horizontal distance between the measuring end of the dial indicator 9 and the axis of the rotating shaft 11 is the same as the vertical distance c between the center of the contact head 601 on the fixed head vertical scale 6 and the axis of the rotating shaft 11, the distance b between the dial indicator 9 and the axis of the rotating shaft 11 can be made equal to the distance a between the axis of the rotating shaft 11 and the center of the contact head 601 on the fixed head vertical scale 6.

[0067] Since the distance between the axis of the rotating shaft 11 and the first side 801 can be measured in advance using a measuring tool, and the distance between the first side 801 and the dial indicator 9 can be read directly using the horizontal scale 15, the horizontal distance between the measuring end of the dial indicator 9 and the axis of the rotating shaft 11 can be quickly adjusted by moving the position of the measuring end of the dial indicator 9 on the horizontal scale 15 until the horizontal distance between the measuring end of the dial indicator 9 and the axis of the rotating shaft 11 is the same as the vertical distance c between the center of the contact head 601 on the vertical scale 6 and the axis of the rotating shaft 11.

[0068] Therefore, when adjusting the height of the fixed head vertical scale 6 to measure the inner diameter of the bearing at different depths, first use the fixed head vertical scale 6 to read the vertical distance c between the center of the contact head 601 on the fixed head vertical scale 6 and the axis of the rotating shaft 11. Then adjust the position of the dial indicator 9 accordingly until the horizontal distance between the measuring end of the dial indicator 9 and the axis of the rotating shaft 11 is the same as the vertical distance c between the center of the contact head 601 on the fixed head vertical scale 6 and the axis of the rotating shaft 11. In this way, the distance b between the dial indicator 9 and the axis of the rotating shaft 11 can be made equal to the distance a between the axis of the rotating shaft 11 and the center of the contact head 601 on the fixed head vertical scale 6.

[0069] In some embodiments, an indicator needle is formed on the front side of the swing block 8, and the indicator needle is at the same height as the center of the rotation shaft 11. That is, by using the indicator needle in conjunction with the vertical scale 6 of the fixed head, the vertical distance c between the center of the contact head 601 on the vertical scale 6 of the fixed head and the axis of the rotation shaft 11 can be read quickly.

[0070] In this embodiment, the measurement accuracy on the fixed head vertical scale 6 and the moving head vertical scale 7 is 0.5 mm.

[0071] As a specific embodiment, such as Figure 2 and Figure 3 As shown, the support 3 is a slender, loop-shaped frame with a slender rectangular cavity inside. The vertical scale 7 of the measuring head 5 extends into the rectangular cavity of the support 3. The measuring stationary head 4 has a rectangular hole along the vertical direction, which completely penetrates the measuring stationary head 4. The swing block 8 is located inside the rectangular hole of the measuring stationary head 4.

[0072] In some embodiments, a handle 10 is installed at each of the left and right ends of the bracket 3, and a high-temperature resistant silicone sleeve is fitted on the handle 10 to facilitate operation by the measuring personnel.

[0073] Optionally, the measuring head 4 can be slidably mounted on the bracket 3. The front of the measuring head 4 has a threaded hole, and a locking bolt is installed in the threaded hole. The measuring head 4 is locked onto the bracket 3 by the locking bolt, so that the position of the measuring head 4 on the bracket 3 can also be adjusted.

[0074] Optional, such as Figure 5 As shown, a scale line 301 is provided on the front of the bracket 3. The purpose of this scale line 301 is to facilitate the measuring personnel to quickly determine the approximate distance between the moving head vertical scale 7 and the fixed head vertical scale 6. This allows the distance between the moving head vertical scale 7 and the fixed head vertical scale 6 to be quickly adjusted to a suitable range before placing this measuring scale mechanism on the standard calibration block 1. It should be noted that, in order to prevent the locking bolt on the measuring moving head 5 from scratching the scale line 301 on the front of the bracket 3, the locking bolt on the measuring moving head 5 can be installed on the back of the measuring moving head 5.

[0075] This rolling mill bearing inner diameter measuring device can be used to measure the inner diameter of rolling mill bearings in their natural state, as well as after heating.

[0076] For example, when using this mill bearing inner diameter measuring device to measure the inner diameter of a mill bearing in its natural state, it generally involves three steps. The first step is preparation: First, adjust the heights of the fixed head vertical scale 6 and the moving head vertical scale 7 to ensure they are at the same height. Second, adjust the position of the dial indicator 9 accordingly so that the distance b between the dial indicator 9 and the axis of the rotating shaft 11 is equal to the distance a between the axis of the rotating shaft 11 and the center of the contact head 601 of the fixed head vertical scale 6. Then, lock the dial indicator 9. It should be noted that this preparation is performed before measuring the bearing inner diameter and does not take up measurement time.

[0077] The second step is to adjust the distance between the measuring moving head 5 and the measuring stationary head 4 according to the inner diameter of the standard calibration block 1, so as to ensure that the distance between the stationary head vertical scale 6 and the moving head vertical scale 7 is slightly smaller than the inner diameter of the standard calibration block 1 (this step is observed by the operator with the naked eye), so as to ensure that the stationary head vertical scale 6 and the moving head vertical scale 7 can be smoothly inserted into the standard calibration block 1. Next, place the mill bearing inner diameter measuring device on the top surface of the standard calibration block 1, ensuring that the fixed-head vertical scale 6 and the moving-head vertical scale 7 extend into the standard calibration block 1. Then, gently push the bracket 3 towards the side where the measuring moving head 5 is located, causing the contact head 601 on the left side of the moving-head vertical scale 7 to contact the first inner surface 101 of the standard calibration block 1. Simultaneously, the oscillating measuring mechanism rotates counterclockwise by a small angle under its own weight, around the axis of the rotating shaft 11, thereby causing the fixed-head vertical scale 6 and the horizontal scale 15 to rotate counterclockwise by a small angle until the contact head 601 of the fixed-head vertical scale 6 abuts against the second inner surface 102 of the standard calibration block 1. At this point, the dial indicator 9 displays a reading, and the operator then zeroes the dial indicator 9. After zeroing, use the locking device on the measuring moving head 5 to lock the measuring moving head 5 onto the bracket 3, ensuring it is not loose. At this point, only the oscillating block 8 can rotate.

[0078] It should be noted that both the first and second steps are tasks that can be completed in advance and do not take up time during the actual measurement.

[0079] The third step is to place the mill bearing inner diameter measuring device onto the bearing to be tested. Due to manufacturing errors, the actual inner diameter of the bearing may be slightly larger or smaller than the inner diameter of the standard calibration block 1. However, since the swing block 8 is rotatable, the fixed head vertical scale 6 and the moving head vertical scale 7 can be smoothly inserted into the bearing regardless of whether the actual inner diameter of the bearing to be tested is slightly larger or smaller than the inner diameter of the standard calibration block 1.

[0080] Specifically, if the actual inner diameter of the bearing under test is slightly larger than the inner diameter of the standard calibration block 1, then the fixed-head vertical scale 6 and the moving-head vertical scale 7 can definitely extend into the bearing under test. Next, the measuring personnel gently push the bracket 3 towards the side where the moving head 5 is located, causing the contact head 601 on the left side of the moving-head vertical scale 7 to contact the inner wall of the bearing under test. Since there is a gap between the contact head 601 of the fixed-head vertical scale 6 and the inner wall of the bearing under test, the oscillating measuring mechanism rotates counterclockwise by a small angle around the axis of rotation 11 under its own weight. This causes the fixed-head vertical scale 6 and the horizontal scale 15 to rotate counterclockwise by a small angle together until the contact head 601 of the fixed-head vertical scale 6 abuts against the second inner surface 102 of the standard calibration block 1. Then, the measuring personnel read the value of the dial indicator 9. Thus, the inner diameter of the bearing under test is the sum of the absolute values ​​of the inner diameter of the standard calibration block 1 and the value of the dial indicator 9.

[0081] If the actual inner diameter of the bearing under test is slightly smaller than the inner diameter of the standard calibration block 1, then due to the limitation of the internal space of the bearing under test, the side wall of the bearing under test abuts against the contact head 601 of the fixed head vertical scale 6. This causes the oscillating measuring mechanism to rotate clockwise by a small angle around the axis of the rotating shaft 11 under the push of the inner wall of the bearing under test, thereby causing the fixed head vertical scale 6 and the horizontal scale 15 to rotate clockwise by a small angle together. At this time, the contact head 601 of the moving head vertical scale 7 is in contact with the inner wall of the bearing under test. Then the measuring personnel read the value of the dial indicator 9. The inner diameter of the bearing under test is the difference between the absolute value of the inner diameter of the standard calibration block 1 and the value of the dial indicator 9.

[0082] It should be noted that if the absolute value of the dial indicator 9 exceeds the set threshold, it means that the actual inner diameter of the bearing under test exceeds the theoretical inner diameter threshold of the bearing, that is, the quality of the bearing is unqualified.

[0083] As can be seen, by using this rolling mill bearing inner diameter measuring device to measure the bearing inner diameter, it is possible to quickly determine whether the actual inner diameter of the bearing to be measured falls within the theoretical inner diameter threshold of the bearing, so as to help the staff quickly determine whether the rolling mill bearing is qualified.

[0084] Unlike traditional methods of measuring bearing inner diameter using micrometers or calipers, using this rolling mill bearing inner diameter measuring device offers the following advantages: First, the actual measurement time is very short, allowing for rapid measurement of the bearing inner diameter; it is simple and easy to use. Second, due to its simplicity, it is easy for workers to learn and master, requiring minimal experience and is convenient to use.

[0085] Furthermore, it is important to note that previously, when measuring the inner diameter of the same batch of bearings, micrometers or calipers were typically used to measure each bearing individually, requiring repeated measurement steps and consuming a significant amount of time. However, using this rolling mill bearing inner diameter measuring device, only the standard calibration block 1 for the batch of bearings needs to be prepared in advance. Then, the measuring scale mechanism is zeroed using the standard calibration block 1. The measuring scale mechanism can then be used directly to measure the inner diameter of the entire batch of bearings. Therefore, the inner diameter of the batch of bearings can be measured very quickly, significantly reducing measurement time and greatly improving measurement efficiency.

[0086] When using this mill bearing inner diameter measuring device to measure the hot-mounted bearing of the mill, there are four main steps. The first step is to perform the above-mentioned preparatory work, that is, to adjust the height of the fixed head vertical scale 6 and the moving head vertical scale 7 in advance, and to adjust the position of the dial indicator 9 so that the distance b between the dial indicator 9 and the axis of the rotating shaft 11 is equal to the distance a between the axis of the rotating shaft 11 and the center of the contact head 601 of the fixed head vertical scale 6. Then, lock the dial indicator 9.

[0087] The second step is to zero the dial indicator 9 using the standard calibration block 1. After zeroing, use the locking device on the measuring head 5 to lock the measuring head 5 in place, ensuring it is not loose. At this point, only the oscillating block 8 can rotate.

[0088] The third step is to measure the inner diameter of the bearing before heating, and then compare the measured inner diameter of the bearing with the theoretical inner diameter of the bearing. If the measured inner diameter of the bearing falls within the theoretical inner diameter threshold, the bearing will be heated. If the measured inner diameter of the bearing exceeds the theoretical inner diameter threshold, it indicates that the quality problem of the mill bearing is serious and there is no need to heat the mill bearing.

[0089] It should be noted that the purpose of the third step is to check whether the inner diameter of the rolling mill bearing is out of tolerance, that is, whether the difference between the theoretical value and the actual value of the inner diameter of the rolling mill bearing is within a reasonable range. If the inner diameter of the rolling mill bearing deviates too much from the theoretical inner diameter, it means that the quality of the rolling mill bearing is seriously unqualified, and there is no need to carry out the subsequent steps.

[0090] The fourth step is to heat the bearing.

[0091] Fifth step: Place two measuring pads 2 along the diameter direction of the hot-mounted bearing on the top surface of the hot-mounted bearing, and then place the bearing inner diameter measuring device of this mill on the two measuring pads 2. Since the hot-mounted bearing expands due to heat, its inner diameter is definitely larger than the inner diameter of the standard calibration block 1. Therefore, the fixed head vertical scale 6 and the moving head vertical scale 7 can definitely extend into the interior of the hot-mounted bearing. Then, the measuring personnel gently push the bracket 3 towards the side where the measuring moving head 5 is located so that the contact head 601 on the left side of the moving head vertical scale 7 is in contact with the inner wall of the hot-mounted bearing. Since there is a gap between the contact head 601 of the fixed head vertical scale 6 and the inner wall of the hot-mounted bearing, the swing measuring mechanism rotates counterclockwise by a small angle around the axis of the rotating shaft 11 under its own gravity, thereby driving the fixed head vertical scale 6 and the horizontal scale 15 to rotate counterclockwise by a small angle until the contact head 601 of the fixed head vertical scale 6 abuts against the second inner surface 102 of the standard calibration block 1. Then the measuring personnel read the value of the dial gauge 9. Thus, the inner diameter of the heat-fitted bearing is the sum of the absolute values ​​of the inner diameter of standard calibration block 1 and the value of dial indicator 9.

[0092] It should be noted that steps one, two, and three are performed before the bearing to be tested is heated. Only step four is the actual operation step for measuring the inner diameter of the hot-mounted bearing, and the time spent on step four is usually less than 1 minute, thus achieving the effect of quickly measuring the inner diameter of the hot-mounted bearing.

[0093] Compared with previous measurement methods, the method of measuring the inner diameter of hot-mounted bearings using this rolling mill bearing inner diameter measuring device has the following advantages:

[0094] First, it is highly integrated: it combines applicability, practicality, reliability and low cost. Only one set of measuring tools is needed to complete the hot fitting operation, which significantly improves work efficiency.

[0095] Secondly, the tools are low-cost, require no complex equipment, reduce manpower input (can be operated by a single person), and have significant overall benefits.

[0096] Third, the measurement accuracy can reach 0.01 mm, avoiding human error and solving the error problem caused by the difference in the operator's skill level of traditional tools (micrometer / caliper).

[0097] Fourth, it is suitable for measuring the inner diameter of large bearings (500mm-1500mm). Traditional tools require multiple people to work together, but this device is easy to operate and use, and can be completed by a single person without the need for multiple people to work together.

[0098] Fifth, the key components of the measuring scale mechanism are isolated from the high-temperature environment to avoid the risk of thermal deformation and adapt to the high-temperature environment of 100℃-150℃ at the steel rolling site.

[0099] Sixth, the measurement time is short, avoiding shrinkage, insufficient interference fit, and installation difficulties caused by excessively rapid cooling of the bearing inner ring (1-2℃ / minute). It is highly efficient, meeting the needs of rapid measurement and assembly in hot-fitting operations.

[0100] Seventh, it avoids the operational risks of traditional tools in high-temperature environments. Workers using this measuring equipment do not need to come into contact with high-temperature bearings, ensuring high safety. It also eliminates the need for large measuring tools, simplifying the operation process.

[0101] Eighth, this measuring equipment is resistant to harsh environments, has low requirements for on-site cleanliness such as oil and dust, and is adapted to general industrial environmental standards. It can still operate stably in high-temperature and high-pollution environments.

[0102] In summary, this measuring equipment has advantages such as high measurement accuracy, fast response, simple operation and excellent environmental adaptability. It solves the pain points of traditional measuring tools, such as reliance on personnel experience, low efficiency and high risk. At the same time, it promotes the standardization of hot charging operations and comprehensively improves production safety and economy.

[0103] In the description of this utility model, it should be noted that the terms "upper" and "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0104] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "connection" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0105] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A device for measuring the inner diameter of a rolling mill bearing, characterized in that, The system includes a standard calibration block (1) and a measuring scale mechanism. The inner diameter of the standard calibration block (1) is the same as the inner diameter of the bearing to be measured in its natural state. The measuring scale mechanism includes a bracket (3), a measuring fixed head (4), a measuring moving head (5), a dial indicator (9), a swing measuring mechanism, and a vertical scale (7) for the moving head. The measuring fixed head (4) is mounted on the bracket (3), the measuring moving head (5) is slidably mounted on the bracket (3), and the dial indicator (9) is mounted on the measuring fixed head (4) and located between the measuring fixed head (4) and the measuring moving head (5). The swing measuring mechanism includes a swing block (8), a vertical scale (6) mounted vertically on the swing block (8), and a horizontal scale (15) mounted horizontally on the swing block (8); the swing block (8) is rotatably mounted on the measuring head (4) via a rotating shaft (11), and the horizontal scale (15) is located below the dial indicator (9); The center of gravity of the swing measuring mechanism is offset from the axis of the rotation axis (11). In its natural state, the angle formed between the fixed head vertical scale (6) and the bracket (3) is an acute angle. The moving head vertical scale (7) is vertically mounted on the measuring moving head (5). Both the moving head vertical scale (7) and the fixed head vertical scale (6) have a contact head (601) on the side that contacts the inner wall of the bearing to be measured. The distance between the measuring end of the dial indicator (9) and the rotating shaft (11) is equal to the distance between the contact head (601) of the fixed head vertical scale (6) and the rotating shaft (11).

2. The rolling mill bearing inner diameter measuring device according to claim 1, characterized in that, It also includes two measuring pads (2) for placing on the upper surface of the bearing to be measured to support the measuring scale mechanism.

3. The rolling mill bearing inner diameter measuring device according to claim 1, characterized in that, The fixed-head vertical scale (6) can move up and down relative to the swing block (8), and the moving-head vertical scale (7) can move up and down relative to the measuring moving head (5).

4. The rolling mill bearing inner diameter measuring device according to claim 3, characterized in that, The fixed head vertical scale (6) is slidably mounted on the swing block (8) in the vertical direction, and the fixed head vertical scale (6) is locked on the swing block (8) by a locking member; the moving head vertical scale (7) is slidably mounted on the measuring moving head (5) in the vertical direction, and the moving head vertical scale (7) is locked on the measuring moving head (5) by a locking member.

5. The rolling mill bearing inner diameter measuring device according to claim 1, characterized in that, The swing block (8) has a first side (801) and a second side (802) that are parallel to each other. The swing block (8) is provided with a mounting hole for mounting the rotating shaft (11). The center of gravity of the swing block (8) is lower than the mounting hole.

6. The rolling mill bearing inner diameter measuring device according to claim 5, characterized in that, The horizontal scale (15) is vertically mounted on the first side (801) of the swing block (8), and the distance between the fixed head vertical scale (6) and the second side (802) is less than the distance between the fixed head vertical scale (6) and the rotation axis (11).

7. The rolling mill bearing inner diameter measuring device according to claim 1, characterized in that, The measuring head (5) and the bracket (3) are locked together by a locking device.

8. The rolling mill bearing inner diameter measuring device according to claim 7, characterized in that, The contact heads (601) on both the moving head vertical scale (7) and the fixed head vertical scale (6) are hemispherical.

9. A rolling mill bearing inner diameter measuring device according to claim 1, characterized in that, The measuring stationary head (4) is equipped with a dial indicator mounting base at one end near the measuring moving head (5). The dial indicator (9) is mounted on the dial indicator mounting base and can slide relative to the dial indicator mounting base.

10. A rolling mill bearing inner diameter measuring device according to claim 2, characterized in that, The standard calibration block (1) has a first inner surface (101) and a second inner surface (102) that are parallel to each other. The distance between the first inner surface (101) and the second inner surface (102) is the same as the inner diameter of the bearing under test in its natural state.

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