Rolling mill bearing inner diameter measuring device

Abstract

The invention relates to the technical field of bearing measuring tools, in particular to a rolling mill bearing inner diameter measuring device. The rolling mill bearing inner diameter measuring device provided by the invention 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 to-be-measured bearing 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] The invention relates to the technical field of bearing measuring tools, and in particular to a rolling mill bearing inner diameter measuring device. Background Art

[0002] During the shrink-fitting process of rolling mill bearings, accurately measuring the inner ring dimensions is crucial for ensuring accurate assembly between the bearing and the shaft. A proper interference fit ensures bearing stability during operation. Inaccurate inner ring dimensions and an inappropriate interference fit can cause the bearing to loosen during operation, impacting mill operation and reducing product quality. For example, during hot rolling, loose bearings can cause the gap between the rolls to shift, resulting in unsatisfactory thickness of the rolled steel. A proper interference fit also ensures the bearing's load-bearing capacity. Insufficient interference fit can cause the bearing to shift or rotate under load, reducing its service life. Excessive interference fit can complicate bearing installation and potentially cause excessive internal stresses, leading to premature fatigue failure. Accurate inner ring measurement helps prevent equipment failures caused by improper assembly. Incorrect fit between the bearing inner ring and the shaft can generate abnormal vibration and noise under high-speed, heavy-load conditions. These abnormalities can accelerate wear on other equipment components and even lead to serious safety issues such as 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 causes lubrication failure and ultimately damages the bearing.

[0003] At present, the following two methods are often used for measurement during the hot installation of rolling mill bearings: First, measurement is performed using a caliper or micrometer. However, it takes a long time to measure the inner diameter of the hot-installed bearing using a caliper or micrometer, usually about 8 minutes. The inner ring of the hot-installed bearing cools down quickly (about 1-2°C / minute), which takes a long time to measure the inner diameter of the hot-installed bearing. As a result, the entire measurement and installation time becomes longer, resulting in the shrinkage of the bearing inner ring, insufficient interference, and subsequent installation difficulties. In addition, the use of a caliper or micrometer for measurement requires a high level of worker experience.

[0004] Second, laser scanning and infrared temperature compensation measurement methods, while advanced, are susceptible to environmental influences, resulting in high instrument procurement and maintenance costs. In the harsh environment of a steel mill, these effects can easily lead to measurement errors. Furthermore, these errors require specialized correction methods, making them extremely difficult to maintain.

[0005] Therefore, how to design a bearing inner diameter measurement tool that is simple to operate, has a short measurement time and is low-cost has become a technical problem that needs to be solved urgently. Summary of the Invention

[0006] (1) The problem to be solved by the present invention is: how to design a bearing inner diameter measuring tool with simple operation, short measuring time and low cost.

[0007] (2) Technical solution

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

[0009] The measuring scale mechanism includes a bracket, a measuring fixed head, a measuring moving head, a dial indicator, a swinging measuring mechanism and a moving head vertical scale. The measuring fixed head is installed on the bracket, the measuring moving head is slidably installed on the bracket, the dial indicator is installed on the measuring fixed head and is located between the measuring fixed head and the measuring moving head.

[0010] The swinging measuring mechanism includes a swinging block, a fixed head vertical scale vertically installed on the swinging block and a horizontal scale horizontally installed on the swinging block. The swinging block is rotatably installed on the measuring fixed head through a rotating shaft, and the horizontal scale is located below the dial indicator.

[0011] The center of gravity of the swinging measuring mechanism deviates from the axis of the rotating shaft. In the natural state, the angle formed between the fixed head vertical scale and the bracket is an acute angle.

[0012] The moving head vertical scale is vertically installed on the measuring moving head. Contact heads are provided on the sides of the moving head vertical scale and the fixed head vertical scale that are in contact with 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 fixed head vertical scale and the rotating shaft.

[0013] According to an embodiment of the present invention, it further includes two measuring pads, 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 an embodiment of the present invention, the fixed head vertical scale can move up and down relative to the swinging block, and the moving head vertical scale can move up and down relative to the measuring moving head.

[0015] According to an embodiment of the present invention, the fixed head vertical scale is slidably installed on the swinging block in the vertical direction and is locked to the swinging block through a locking member; the moving head vertical scale is slidably installed on the measuring moving head in the vertical direction and is locked to the measuring moving head through a locking member.

[0016] According to an embodiment of the present invention, the swinging block has a first side surface and a second side surface that are parallel to each other. An installation hole for installing the rotating shaft is provided on the swinging block, and the center of gravity of the swinging block is lower than the installation hole.

[0017] According to an embodiment of the present invention, the horizontal scale is vertically installed on the first side surface of the swinging block, and the distance between the fixed head vertical scale and the second side surface is less than the distance between the fixed head vertical scale and the rotating shaft.

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

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

[0020] According to an embodiment of the present invention, a dial indicator mounting seat is installed at one end of the measuring fixed head close to the measuring moving head. The dial indicator is installed on the dial indicator mounting seat and can slide relative to the dial indicator mounting seat.

[0021] According to an 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 measured in its natural state.

[0022] Advantages of the present invention:

[0023] Compared with the previous measurement methods, the method of using the inner diameter measuring device for rolling mill bearings to measure the inner diameter of the hot-fitted bearing has the following advantages:

[0024] First, the time actually spent on measuring the inner diameter of the hot-fitted bearing is very short, and the inner diameter of the hot-fitted bearing can be quickly measured, avoiding the problem of difficult bearing installation caused by the shrinkage of the bearing inner ring and insufficient interference due to long measurement time. Second, due to the simple operation, it is easy for workers to learn and master, with low requirements for workers' experience and convenient to use. Third, the inner diameter measuring device for rolling mill bearings of the present invention has high practicability and reliability and low cost. Description of the Drawings

[0025] In order to more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for use in the description of the specific embodiments or the prior art. Obviously, the following drawings are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0026] Figure 1Schematic structural diagram of the mill bearing inner diameter measuring device provided by the embodiment of the present invention;

[0027] Figure 2 Front view of the measuring scale mechanism provided by the embodiment of the present invention;

[0028] Figure 3 Top view of the measuring scale mechanism provided by the embodiment of the present invention;

[0029] Figure 4 Schematic diagram of the dial indicator, dial indicator base, swing block, horizontal scale and fixed head vertical scale provided by the embodiment of the present invention;

[0030] Figure 5 Structural diagram of another measuring scale mechanism provided by the embodiment of the present invention;

[0031] Figure 6 Structural diagram of the measuring moving head and the moving head vertical scale provided by the embodiment of the present invention.

[0032] Icon: 1, standard calibration block; 2, measuring cushion block; 3, bracket; 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, grip; 11, rotating shaft; 12, base; 121, sliding rod; 13, slider; 14, first locking member; 15, horizontal scale; 16, second locking member. Detailed implementation manners

[0033] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0034] As Figures 1 - 5 shown, an embodiment of the present invention provides a mill bearing inner diameter measuring device, including 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 corresponding bearing to be measured in the 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, a swing measuring mechanism and a moving head vertical scale 7; the measuring fixed head 4 is installed on the bracket 3, the measuring moving head 5 is slidably installed on the bracket 3, and the dial indicator 9 is installed on the measuring fixed head 4 and is located between the measuring fixed head 4 and the measuring moving head 5;

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

[0037] The center of gravity of the swing measurement mechanism deviates from the axis of the rotating shaft 11. In the natural state, the angle formed between the fixed head vertical scale 6 and the bracket 3 is an acute angle;

[0038] A moving head vertical scale 7 is vertically installed on the measuring moving head 5. Contact heads 601 are provided on the sides of the moving head vertical scale 7 and the fixed head vertical scale 6 that are in contact with 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 standard calibration blocks 1 of different sizes need to be made corresponding to different sizes of bearings. The inner diameter of the standard calibration block 1 is the same as the inner diameter of the corresponding bearing to be measured in the natural state. Moreover, the standard calibration block 1 is made by a professional measuring tool manufacturer according to the inner diameter of the bearing, and is calibrated by a quality inspection agency. The error precision between the inner diameter of the standard calibration block 1 and the inner diameter of the corresponding bearing is ≤±4μm.

[0040] In some embodiments, the standard calibration block 1 is as Figure 1 shown. Its outer shape is concave. The standard calibration block 1 has parallel first inner surface 101 and second inner surface 102. 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, when manufacturing the standard calibration block 1, it is made according to the inner diameter of the bearing specified in the bearing instruction manual to ensure that 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 have an accuracy error within ±4μm.

[0041] In this embodiment, when using this rolling mill bearing inner diameter measuring device to detect the inner diameter of a hot-fitted bearing, first, adjust the distance between the measuring moving head 5 and the measuring fixed head 4 according to the inner diameter of the standard calibration block 1 to ensure that the distance between the fixed head vertical scale 6 and the moving head vertical scale 7 is slightly smaller than the inner diameter between the standard calibration blocks 1 (this step can be observed by the operator with the naked eye) to ensure that the subsequent fixed head vertical scale 6 and moving head vertical scale 7 can smoothly extend into the standard calibration block 1. Then place this rolling mill bearing inner diameter measuring device on the top surface of the standard calibration block 1 and make the fixed head vertical scale 6 and the moving head vertical scale 7 extend into the standard calibration block 1, and then towards the side where the measuring moving head 5 is located (i.e. Figure 1On the left side in the figure), gently push the support 3 so that the contact head 601 on the left side of the moving head vertical scale 7 fits against the first inner surface 101 of the standard calibration block 1. At the same time, under the action of its own gravity, the swing measuring mechanism rotates counterclockwise by a small angle around the axis of the rotating shaft 11, thereby driving 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. At this time, the dial indicator 9 shows a reading, and then the operator zeroes the dial indicator 9. This step is carried out before heating the bearing and belongs to the preparatory work.

[0042] The specific operation steps for specifically measuring the inner diameter of the heated bearing are as follows: Place the inner diameter measuring device of this rolling mill bearing on the heated bearing to be measured (hereinafter collectively referred to as the hot-fitted bearing). Since the hot-fitted bearing expands due to heat, its inner diameter must be larger than the inner diameter of the standard calibration block 1. Therefore, at this time, the fixed head vertical scale 6 and the moving head vertical scale 7 can surely extend into the interior of the hot-fitted bearing. Then, the measuring personnel gently push the support 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 abuts against the inner wall of the hot-fitted 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-fitted bearing at this time, under the action of its own gravity, the swing measuring mechanism rotates counterclockwise by a small angle around the axis of the rotating shaft 11, thereby driving 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. In this way, the inner diameter of the hot-fitted bearing 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.

[0043] It should be noted that generally, the difference in the inner diameter of the bearing to be measured before and after heating is generally within 2 mm (coefficient of thermal expansion of bearing steel ≈ 11×10 -6 / °C). In this embodiment, for example Figure 4As shown in the figure, it is required that 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 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 this measuring device for the inner diameter of the rolling mill bearing on the bearing to be measured after heating, when 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-fitted 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-fitted bearing is ≤ 2 mm. That is, the angle by which the entire swing measuring mechanism rotates counterclockwise around the rotating shaft 11 is very small. Therefore, the rotational movement of the contact head 601 can be approximately regarded as a horizontal movement, and the rotational movement of the horizontal scale 15 can be regarded as a lifting movement. Also, because 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 equal to the distance b between the axis of the rotating shaft 11 and the bottom measuring end of the dial indicator 9, then 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. Through experimental calculation, the error between the horizontal displacement of the contact head 601 of the fixed head vertical scale 6 and the vertical displacement of the horizontal scale 15 is less than 0.01 mm.

[0044] It can be seen that compared with the previous measurement methods, the method of using this measuring device for the inner diameter of the rolling mill bearing to measure the inner diameter of the hot-fitted bearing has the following advantages:

[0045] First, the time actually spent on measuring the inner diameter of the hot-fitted bearing is very short, and the inner diameter of the hot-fitted bearing can be quickly measured, avoiding the problem of difficult bearing installation caused by the shrinkage of the bearing inner ring and insufficient interference due to long measurement time. Second, due to the simple operation, it is easy for workers to learn and master, has low requirements for workers' experience, and is convenient to use. Third, this measuring device for the inner diameter of the rolling mill bearing has high practicability and reliability and low cost.

[0046] It should be noted that the working principle of the dial indicator 9 is to use the meshing of the rack and the gear to convert the linear movement of the measuring rod into the rotational movement of the pointer, so as to display the measurement value on the dial. Usually, when the measuring end (measuring rod) of the dial indicator 9 is pressed and moves downward, the gear transmission mechanism will drive the pointer to rotate clockwise, displaying a positive value; while when the measuring end retracts (that is, the measuring rod moves upward), the pointer will rotate counterclockwise, displaying a negative value.

[0047] It should be noted that when using a caliper or a micrometer to measure the inner diameter of a hot-fitted bearing in the past, due to the high temperature of the hot-fitted bearing and the direct contact between the caliper or micrometer and the hot-fitted bearing, it will cause thermal deformation of the caliper or micrometer, and the thermal deformation of the measuring tool will cause measurement errors.

[0048] The mill bearing inner diameter measuring device in this embodiment further includes two measuring pads 2. The measuring pads 2 are made of low-thermal-conductivity ceramic materials to isolate heat conduction. The two measuring pads 2 have the same height, and the height error of the measuring pads 2 is within 0.01 MM to ensure that the heights of the two measuring pads 2 are the same to the greatest extent. In addition, the contact heads 601 on the moving head vertical scale 7 and the contact heads 601 on the fixed head vertical scale 6 are made of materials with low coefficient of thermal expansion (such as carbon fiber), and 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-fitted bearing, the two measuring pads 2 can be placed on the top surface of the hot-fitted bearing along the diameter direction of the hot-fitted bearing, and then this mill bearing inner diameter measuring device is placed on the two measuring pads 2. The function of the measuring pads 2 is to prevent the bracket 3 from directly contacting the hot-fitted bearing over a large area, thereby greatly reducing the measurement error caused by the thermal deformation of the measuring tool.

[0050] Moreover, during the measurement process, only the contact heads 601 on the moving head vertical scale 7 and the contact heads 601 on the fixed head vertical scale 6 directly contact the inner diameter of the hot-fitted bearing, making the contact surface between this mill bearing inner diameter measuring device and the hot-fitted bearing very small. The moving head vertical scale 7, the fixed head vertical scale 6, the moving head of the moving head vertical scale 7, the contact heads 601 on the moving head vertical scale 7, and the contact heads 601 on the fixed head vertical scale 6 are all made of materials with low coefficient of thermal expansion. Ultimately, the measurement error caused by the thermal deformation of the measuring tool can be greatly reduced, improving the measurement accuracy.

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

[0052] To avoid scratching the inner diameter of the bearing by the contact heads 601 on the moving head vertical scale 7 and the contact heads 601 on the fixed head vertical scale 6 when measuring the inner diameter of the hot-fitted bearing, in this embodiment, the contact heads 601 on the moving head vertical scale 7 and the contact heads 601 on the fixed head vertical scale 6 are both plated with hard chromium or ceramic coatings (such as ZrO 2 ), so that scratching of the bearing inner ring during measurement can be avoided (especially for the precision grinding surface with surface roughness Ra ≤ 0.8 μm), and at the same time, the adhesion of iron filings affecting the reading can be prevented.

[0053] In some embodiments, such as Figure 2 and Figure 4As shown, the contact heads 601 on the moving head vertical scale 7 and the contact heads 601 on the fixed head vertical scale 6 are both hemispheres. In this way, the contact between the contact heads 601 on the two scales and the inner wall of the hot-fitted bearing is point contact, and the contact area is very small. Therefore, the contact area between the measuring device and the hot-fitted bearing can be minimized, 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 movably mounted on the swing block 8, and the moving head vertical scale 7 is movably mounted on the measuring moving head 5. The purpose of such a setting is to enable this measuring device to measure the inner diameter dimensions of different depths of the hot-fitted bearing.

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

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

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

[0058] As Figure 2 shown, a rectangular through hole 502 is opened on the front surface of the connecting block 501. The 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 in the connecting block 501. It should be noted that the inner bottom wall of the rectangular through hole 502 is in the same horizontal plane as the upper surface of the measuring moving head 5. From Figure 6 it can be seen that the moving head vertical scale 7 inside the connecting block 501 can be seen from the front of the measuring moving head 5.

[0059] Since the upper surfaces of the measuring fixed head 4 and the measuring moving head 5 are located in the same horizontal plane, and the moving head vertical scale 7 and the fixed head vertical scale 6 are exactly the same, when adjusting the heights of the moving head vertical scale 7 and the fixed head vertical scale 6, the first locking member 14 on the connecting block 501 can be loosened first, and then the height of the moving head vertical scale 7 can be manually adjusted to an appropriate height. Then, the first locking member 14 is tightened, and then the specific value A of the upper surface of the measuring moving head 5 falling into the moving head vertical scale 7 is observed from the front of the bracket 3. Then, the second locking member 16 on the swinging block 8 is loosened, and then the height of the fixed head vertical scale 6 is manually adjusted until the specific value B of the upper surface of the measuring fixed head 4 falling into the fixed head vertical scale 6 is the same as A. Finally, the second locking member 16 is tightened again. In this way, the moving head vertical scale 7 and the fixed head vertical scale 6 can be adjusted to the same height.

[0060] In this embodiment, as Figure 1 shown, a locking member, such as a bolt or a screw rod, etc., is threadedly installed on the front surface of the measuring moving head 5. The measuring moving head 5 can be locked to the bracket 3 by using this locking member.

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

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

[0063] It should be noted that the swinging block 8 can be made of metals with different densities, as long as it is ensured that the swinging block 8 can rotate around the axis of the rotating shaft 11 under its own gravity. As for the shape of the swinging block 8, no specific restrictions are made.

[0064] Furthermore, the horizontal scale 15 is vertically installed on the first side surface 801 of the swinging block 8. The distance between the fixed head vertical scale 6 and the second side surface 802 is less than the distance between the fixed head vertical scale 6 and the rotating shaft 11.

[0065] It should be noted that in this embodiment, since the height of the fixed-head vertical scale 6 can be adjusted, and the horizontal position of the dial indicator 9 can also be adjusted. That is to say, the length of 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. In addition, 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 by using the fixed-head vertical scale 6. And 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 by 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 by 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 is equal to the horizontal distance d between the axis of the rotating shaft 11 and the center of the contact head 601. 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 made 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 head of 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 of the fixed-head vertical scale 6.

[0067] Since the distance between the axis of the rotating shaft 11 and the first side surface 801 can be measured in advance by using a measuring tool, and the distance between the first side surface 801 and the head of the dial indicator 9 can be directly read by using the horizontal scale 15, therefore, by moving the position of the measuring end of the dial indicator 9 on 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 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.

[0068] Therefore, when the height of the fixed-head vertical scale 6 is lowered or raised each time 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, and 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 head of 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 of the fixed-head vertical scale 6.

[0069] In some embodiments, an indicating needle is engraved on the front surface of the swing block 8, and the height of the indicating needle is the same as the center of the rotation axis 11. That is, by using the cooperation between the indicating needle and the fixed head vertical scale 6, the vertical distance c between the center of the contact head 601 on the fixed head vertical scale 6 and the axis of the rotation axis 11 can be quickly read out.

[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, as Figure 2 and Figure 3 shown, the bracket 3 is in the shape of a slender U-shaped frame, and a slender rectangular cavity is formed inside the bracket 3. The moving head vertical scale 7 on the moving head 5 extends into the rectangular cavity of the bracket 3. A rectangular hole is provided vertically on the measuring fixed head 4, and the rectangular hole completely penetrates the measuring fixed head 4, and the swing block 8 is located in the rectangular hole of the measuring fixed head 4.

[0072] In some embodiments, a grip 10 is respectively installed at the left and right ends of the bracket 3, and a high-temperature resistant silica gel sleeve is sleeved on the grip 10, which is convenient for the measurement personnel to operate.

[0073] Optionally, the measuring fixed head 4 is slidably installed on the bracket 3. A threaded hole is provided on the front surface of the measuring fixed head 4, and a locking bolt is threadedly installed in the threaded hole. The measuring fixed head 4 is locked to the bracket 3 by using the locking bolt, so that the position of the measuring fixed head 4 on the bracket 3 can also be adjusted.

[0074] Optionally, as Figure 5 shown, scale lines 301 are provided on the front surface of the bracket 3. The purpose of setting the scale lines 301 is to facilitate the measurement personnel to quickly judge the approximate distance between the moving head vertical scale 7 and the fixed head vertical scale 6. So that before the measuring scale mechanism is placed on the standard calibration block 1, the distance between the moving head vertical scale 7 and the fixed head vertical scale 6 can be quickly adjusted to a suitable range. It should be noted that in order to prevent the locking bolt on the moving head 5 from scratching the scale lines 301 on the front surface of the bracket 3, the locking bolt on the moving head 5 can be installed on the back surface of the moving head 5.

[0075] This measuring device for the inner diameter of a rolling mill bearing can be used to measure the inner diameter of a rolling mill bearing in its natural state, and can also be used to measure the inner diameter of a rolling mill bearing after heating.

[0076] For example, when measuring the inner diameter of a rolling mill bearing in its natural state using the inner diameter measuring device of the rolling mill, it is roughly divided into three steps. The first step is to make preparations: First, adjust the heights of the fixed head vertical scale 6 and the moving head vertical scale 7 to ensure that their heights are the same. Second, adjust the position of the dial indicator 9 accordingly so that the distance b between the tip of 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 preparatory work is carried out before measuring the inner diameter of the bearing and does not take up the measuring time.

[0077] In the second step, adjust the distance between the measuring moving head 5 and the measuring fixed head 4 according to the inner diameter of the standard calibration block 1 to ensure that the distance between the fixed head vertical scale 6 and the moving head vertical scale 7 is slightly less than the inner diameter of the standard calibration block 1 (this step is observed by the operator with the naked eye) to ensure that the fixed head vertical scale 6 and the moving head vertical scale 7 can smoothly extend into the standard calibration block 1 later. Then place the inner diameter measuring device of the rolling mill bearing on the top surface of the standard calibration block 1 and make 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 so that the contact head 601 on the left side of the moving head vertical scale 7 fits against the first inner surface 101 of the standard calibration block 1. At the same time, the swinging measuring mechanism rotates counterclockwise by a small angle around the axis of the rotating shaft 11 under the action of its own gravity, thereby driving 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. At this time, the dial indicator 9 shows a reading, and then the operator zeros the dial indicator 9. After zeroing, lock the measuring moving head 5 to the bracket 3 using the locking member on the measuring moving head 5 and ensure that it does not loosen. At this time, only the swinging block 8 can rotate.

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

[0079] In the third step, place the inner diameter measuring device of the rolling mill bearing on the bearing to be measured. Due to manufacturing errors in the bearing to be measured, its actual inner diameter may be slightly larger or smaller than the inner diameter of the standard calibration block 1. However, since the swinging block 8 is rotatable, therefore, regardless of whether the actual inner diameter of the bearing to be measured is slightly larger or smaller than the inner diameter of the standard calibration block 1, the fixed head vertical scale 6 and the moving head vertical scale 7 can both smoothly insert into the bearing to be measured.

[0080] Specifically, if the actual inner diameter of the bearing to be measured 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 surely extend into the interior of the bearing to be measured at this time. 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 bearing to be measured. Since there is a gap between the contact head 601 of the fixed-head vertical scale 6 and the inner wall of the bearing to be measured at this time, therefore, under the action of its own gravity, the swing measuring mechanism rotates counterclockwise by a small angle around the axis of the rotating shaft 11, thereby driving 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. In this way, the inner diameter of the bearing to be measured is the sum of the absolute value 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 to be measured 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 to be measured, the side wall of the bearing to be measured abuts against the contact head 601 of the fixed-head vertical scale 6, so that the swing measuring mechanism rotates clockwise by a small angle around the axis of the rotating shaft 11 under the push of the inner wall of the bearing to be measured, thereby driving 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 to be measured. Then, the measuring personnel read the value of the dial indicator 9, and the inner diameter of the bearing to be measured is the difference between the inner diameter of the standard calibration block 1 and the absolute value of the value of the dial indicator 9.

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

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

[0084] Different from the traditional method of using a micrometer or a caliper to measure the inner diameter of a bearing, using this measuring device for the inner diameter of the rolling mill bearing to measure the inner diameter of the bearing has the following advantages: First, the time spent on actually measuring the inner diameter of the bearing is very short, and the inner diameter of the bearing to be measured can be quickly measured, which is simple to use and convenient to operate. Second, due to the simple operation, it is easy for workers to learn and master, and the requirement for workers' experience is low, and it is convenient to use.

[0085] In addition, it should be specifically noted that in the past, when measuring the inner diameters of the same batch of bearings to be tested, micrometers or calipers were usually used to measure one by one, and the measurement steps needed to be repeated each time, which took a long time. When using this rolling mill bearing inner diameter measuring device for measurement, only the standard calibration block 1 for the bearings to be tested in this batch needs to be prepared in advance, and then the measuring scale mechanism is zeroed using the standard calibration block 1. Then, this measuring scale mechanism can be used to directly measure the bearings to be tested in this batch. Therefore, the inner diameters of the bearings in this batch can be measured very quickly, greatly shortening the measurement time and significantly improving the measurement efficiency.

[0086] When using this rolling mill bearing inner diameter measuring device to measure the hot-fitted bearings of the rolling mill, it is mainly divided into four steps. The first step is to perform the above-mentioned preparatory work, that is, to adjust the heights of the fixed head vertical scale 6 and the moving head vertical scale 7 in advance and adjust the position of the dial indicator 9, and make the distance b between the head of the dial indicator 9 and the axis of the rotating shaft 11 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, and 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, lock the measuring moving head 5 using the locking member on the measuring moving head 5, and it must not be loosened. At this time, only the swing 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 to be tested with the theoretical inner diameter of this bearing. If the measured inner diameter of the bearing to be tested falls within the theoretical inner diameter threshold, heat the bearing to be tested. If the measured inner diameter of the bearing to be tested exceeds the theoretical inner diameter threshold, it indicates that the quality problem of this rolling mill bearing is serious, and there is no need to heat this rolling mill bearing.

[0089] It should be noted that the purpose of the third step is to detect whether the inner diameter of the rolling mill bearing exceeds the 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 detected inner diameter of the rolling mill bearing deviates too much from the theoretical inner diameter, it indicates that the quality of this rolling mill bearing is seriously unqualified, and there is no need to perform the subsequent steps.

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

[0091] Step 5: Place the two measuring pads 2 on the top surface of the hot-fitted bearing along the diameter direction of the hot-fitted bearing, and then place the inner diameter measuring device of this rolling mill bearing on the two measuring pads 2. Since the hot-fitted bearing expands due to heat, its inner diameter must be larger than the inner diameter of the standard calibration block 1. Therefore, at this time, the fixed-head vertical scale 6 and the moving-head vertical scale 7 can surely extend into the interior of the hot-fitted bearing. Then, the measuring personnel gently push the bracket 3 towards the side where the measuring 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-fitted 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-fitted bearing at this time, the swing measuring mechanism rotates counterclockwise by a small angle around the axis of the rotating shaft 11 under the action of its own gravity, thereby driving 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. In this way, the inner diameter of the hot-fitted bearing is the sum of the absolute value of the inner diameter of the standard calibration block 1 and the value of the dial indicator 9.

[0092] It should be particularly noted that the first step, the second step, and the third step are all carried out before heating the bearing to be measured. Only the fourth step is the actual operation step for measuring the inner diameter of the hot-fitted bearing, and the time spent in the fourth step is usually within 1 minute. Therefore, the effect of quickly measuring the inner diameter of the hot-fitted bearing is achieved.

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

[0094] First, strong integration: It has the characteristics of applicability, practicability, reliability, and low cost. Only one set of measuring tools is required to complete the hot-fitting operation, significantly improving work efficiency.

[0095] Second, low tool cost, no need for complex equipment, reducing labor input (single-person operation is possible), and the comprehensive benefits are significant.

[0096] Third, the measurement accuracy can reach 0.01 mm, avoiding human errors and solving the error problems caused by the technical level differences of operators with traditional tools (micrometers / calipers).

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

[0098] Fifth, the key components of the measuring scale mechanism are isolated from the high-temperature environment, avoiding the risk of thermal deformation and adapting to the high-temperature environment of 100°C - 150°C at the rolling mill site.

[0099] Sixth, the measurement time is short, avoiding the shrinkage of the inner ring of the bearing caused by excessive cooling (1-2 °C per minute), insufficient interference fit, and difficult installation. It has strong timeliness and meets the requirements of rapid measurement and assembly for hot installation operations.

[0100] Seventh, it avoids the operation risks of traditional tools in high-temperature environments. When using this measuring device, the workers do not need to contact the high-temperature bearing, which has high safety. It does not require large measuring tools and simplifies the operation process.

[0101] Eighth, this measuring device is resistant to harsh environments, has low requirements for on-site cleanliness such as oil stains and dust, and meets the general industrial environment standards. It can still operate stably in high-temperature and highly polluted environments.

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

[0103] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by terms such as "upper" and "lower" is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0104] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installation", "connection", and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the connection inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations. In addition, in the description of the present invention, unless otherwise stated, the meaning of "a plurality" is two or more.

[0105] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included within the protection scope of the present invention.

Claims

1. A measuring device for the inner diameter of a rolling mill bearing, characterized in that, It 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 fixed measuring head (4), a movable measuring head (5), a dial indicator (9), a swing measuring mechanism, and a movable head vertical scale (7); the fixed measuring head (4) is installed on the bracket (3), the movable measuring head (5) is slidably installed on the bracket (3), the dial indicator (9) is installed on the fixed measuring head (4) and is located between the fixed measuring head (4) and the movable measuring head (5); The swing measuring mechanism includes a swing block (8), a fixed head vertical scale (6) vertically installed on the swing block (8), and a horizontal scale (15) horizontally installed on the swing block (8); the swing block (8) is rotatably installed on the fixed measuring head (4) through 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 deviates from the axis of the rotating shaft (11). In the natural state, the angle formed between the fixed head vertical scale (6) and the bracket (3) is an acute angle; The movable head vertical scale (7) is vertically installed on the movable measuring head (5). Contact heads (601) are provided on the sides of the movable head vertical scale (7) and the fixed head vertical scale (6) that are in contact with 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 inner diameter measuring device for a rolling mill bearing according to claim 1, characterized in that It also includes two measuring pads (2), and the measuring pads (2) are used to be placed on the upper surface of the bearing to be measured to support the measuring scale mechanism.

3. The inner diameter measuring device for a rolling mill bearing 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 movable head vertical scale (7) can move up and down relative to the movable measuring head (5).

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

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

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

7. The inner diameter measuring device for a rolling mill bearing according to claim 1, characterized in that, The movable measuring head (5) is locked to the bracket (3) through a locking member.

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

9. The inner diameter measuring device for a rolling mill bearing according to claim 1, characterized in that One end of the measuring fixed head (4) close to the measuring moving head (5) is provided with a dial indicator mounting seat, and the dial indicator (9) is mounted on the dial indicator mounting seat and can slide relative to the dial indicator mounting seat.

10. The inner diameter measuring device for a rolling mill bearing 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, and the distance between the first inner surface (101) and the second inner surface (102) is the same as the inner diameter of the bearing to be measured in the natural state.

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