Mechanical comparator for bearing testing

Abstract

This utility model relates to a mechanical comparator suitable for bearing testing, comprising a housing, a first positioning block fixedly mounted on the top of the housing by a first bolt and a second bolt, and a base plate fixedly connected to the bottom of the housing; an adjusting block fixedly mounted inside the housing, the adjusting block being connected to a first guide post, the first guide post being fitted with a first guide sleeve; the adjusting block being connected to a second guide post, the second guide post being fitted with a second guide sleeve; a fixing block being mounted on the upper end of the first and second guide posts; and a second positioning block being connected to the fixing block; the inner diameters of both the first and second positioning blocks are matched to the bearing assembly to be tested; an adjustment device is mounted on the base plate for adjusting the gap between the fixing block and the adjusting block. Thus, the inner holes of the first and second positioning blocks precisely match the outer ring of the bearing to be tested, and with the coaxiality control of the mandrel and measuring ring, the bearing is ensured to be subjected to uniform force, avoiding subjective errors caused by reliance on worker experience in traditional dial indicator testing.

Description

Technical Field

[0001] This utility model relates to a comparator, and more particularly to a mechanical comparator suitable for bearing testing. Background Technology

[0002] In the field of bearing manufacturing and assembly, accurate measurement of the radial deformation of bearing assemblies under preload is a crucial step in ensuring assembly precision. Traditional inspection methods rely on manual operation, which suffers from low efficiency and large errors, making it difficult to meet the consistency requirements of mass production.

[0003] Chinese patent CN114777706B discloses a high-precision measuring device for the rotational accuracy of double-row cylindrical roller bearings. Its technical solution, which applies radial load through a lateral drive mechanism and uses a displacement sensor to detect the radial runout of the bearing's outer ring, achieves automated measurement of bearing rotational accuracy, improving detection efficiency to some extent. However, this device primarily targets rotational accuracy detection under radial load and does not address the measurement of bearing radial expansion under axial preload conditions, thus failing to provide direct quantitative evidence for the interference fit between the bearing and the housing.

[0004] Meanwhile, existing improved multi-functional mechanical roundness measuring instruments propose technical solutions integrating multiple measuring mechanisms. However, the guiding structure of this equipment adopts a simple design of fixed brackets and slide rods, resulting in large tolerances and a lack of precision adjustment components for bearing axial preload, making it difficult to ensure stable transmission of preload. Frequent adjustments to the overall structure are required when measuring different types of bearings, leading to poor adaptability and an inability to meet diverse testing needs.

[0005] In view of the above-mentioned shortcomings, the designer actively researched and innovated in order to create a mechanical comparator suitable for bearing testing, making it more valuable for industrial applications. Utility Model Content

[0006] To solve the above-mentioned technical problems, the purpose of this utility model is to provide a mechanical comparator suitable for bearing testing.

[0007] This utility model discloses a mechanical comparator for bearing testing, comprising a housing, wherein a first positioning block is fixedly mounted on the top of the housing by a first bolt and a second bolt, and a base plate is fixedly connected to the bottom of the housing; an adjusting block is fixedly mounted inside the housing, the adjusting block is connected to a first guide post by a fourth screw, and a first guide sleeve is fitted over the first guide post; the adjusting block is connected to a second guide post by a fifth screw, and a second guide sleeve is fitted over the second guide post; a guide block is connected between the first guide sleeve and the second guide sleeve; a fixing block is fixedly mounted on the upper end of the first guide post and the second guide post by a first screw and a seventh screw, respectively; the fixing block is connected to a second positioning block by an eighth screw and a ninth screw; the inner diameters of the first positioning block and the second positioning block are matched with the bearing assembly to be tested; an adjustment device is mounted on the base plate for adjusting the gap between the fixing block and the adjusting block.

[0008] Furthermore, in the aforementioned mechanical comparator suitable for bearing testing, a limiting area is formed between the first positioning block and the second positioning block, and a mandrel is installed within the limiting area; a measuring ring is sleeved on the mandrel; and a plurality of positioning pins are distributed on the inner wall of the measuring ring.

[0009] Furthermore, in the aforementioned mechanical comparator for bearing testing, the measuring ring is connected to the second positioning block via a locking screw.

[0010] Furthermore, in the aforementioned mechanical comparator suitable for bearing testing, the mandrel is fitted with a rotating shaft.

[0011] Furthermore, in the aforementioned mechanical comparator for bearing testing, the adjusting device includes an adjusting bolt movably mounted on a base plate; a storage space is provided below the fixed block, within which a disc spring is installed, and a guide rod passes through the disc spring; a secondary guide groove is provided at a corresponding position on the guide block, and the lower end of the guide rod is inserted into the secondary guide groove; top balls are distributed at the top of the adjusting bolt, and the top balls are movably placed within the secondary guide groove; a primary directional groove is provided at a corresponding position on the adjusting block, and the adjusting bolt is connected to the primary directional groove; the primary directional groove and the secondary guide groove are coaxial; when the adjusting bolt rotates, axial preload is applied to the bearing assembly through the guide rod, top balls, and adjusting bolt.

[0012] Furthermore, in the aforementioned mechanical comparator suitable for bearing testing, a handwheel is mounted on the adjusting bolt.

[0013] Furthermore, in the aforementioned mechanical comparator suitable for bearing testing, a dial indicator is mounted on the housing via a mounting base.

[0014] Furthermore, in the aforementioned mechanical comparator for bearing testing, a first handle is fixedly installed on one side of the housing by a third screw and a second screw; a second handle is fixedly installed on the other side of the housing by a sixth screw and a tenth screw.

[0015] By means of the above solution, this utility model has at least the following advantages: 1. The inner holes of the first and second positioning blocks are precisely matched to the outer ring of the bearing under test. Combined with the coaxiality control of the mandrel and measuring ring, this ensures uniform force distribution on the bearing. The dial indicator accurately captures the deformation along the radial direction of the measuring ring, and the stabilizing force output from the disc spring preload device avoids the subjective errors caused by reliance on worker experience in traditional dial indicator testing. Simultaneously, the standardized measurement process allows the testing error of bearings in the same batch to be controlled within 0.003mm, meeting the consistency requirements of mass production.

[0016] 2. Achieving a balance between low cost and high adaptability through a detachable structural design, the first positioning block, second positioning block, and measuring ring can all be quickly replaced according to different bearing models, eliminating the need to purchase dedicated equipment for a single bearing model. Core components are made from conventional engineering materials, resulting in low overall manufacturing costs. Furthermore, the symmetrical handle design facilitates multi-station relocation within the workshop, making it particularly suitable for low-cost applications in small and medium-sized machine tool spindle assembly enterprises.

[0017] 3. The core transmission components are precisely fitted and made of wear-resistant materials to ensure that the equipment operates continuously without jamming or accuracy degradation. The shaft structure simulates the actual rotation of a bearing, making the measurement process closer to the spindle's operating conditions and avoiding deviations between static testing and actual use. Furthermore, the measurement results directly output the required interference fit for the bearing, directly guiding the subsequent assembly of the bearing and spindle housing without additional calculations.

[0018] The above description is only an overview of the technical solution of this utility model. In order to better understand the technical means of this utility model and to implement it in accordance with the contents of the specification, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the half-section structure of a mechanical comparator suitable for bearing testing.

[0020] Figure 2 This is a side view diagram of a mechanical comparator suitable for bearing testing.

[0021] Figure 3 This is a three-dimensional structural diagram of a mechanical comparator suitable for bearing testing.

[0022] The meanings of the labels in the figures are as follows.

[0023] Detailed Implementation The specific embodiments of this utility model will be described in further detail below with reference to the accompanying drawings and examples. The following examples are used to illustrate this utility model, but are not intended to limit its scope.

[0024] like Figures 1 to 3 This mechanical comparator for bearing testing includes a housing 1, which is unique in that, to ensure overall structural rigidity while controlling equipment weight, housing 1 is made of Q235 low-carbon steel with a wall thickness of 8-12mm. The top of housing 1 is detachably fixed to a first positioning block 4 via first bolts 2 and second bolts 3. During implementation, M8×20 socket head cap screws can be used here, with a transition fit between the bolts and the connecting holes of housing 1 and the first positioning block 4 to avoid wear of the threaded holes due to long-term disassembly. This facilitates subsequent replacement of the first positioning block 4 with a suitable one according to the model of the bearing assembly 29 to be tested, improving the equipment's versatility. Furthermore, the bottom of housing 1 is fixedly connected to a base plate 15 by bolts. M6×15 socket head cap screws can be used for convenient tightening. The base plate 15 is made of 45# steel, with a flatness error controlled within 0.02mm, and the surface is ground to ensure the installation accuracy of subsequent adjustment devices.

[0025] An adjusting block 13 is installed in the internal cavity of the housing 1. The adjusting block 13 is made of alloy and has moderate wear resistance and deformation resistance. Two threaded holes with a coaxiality error ≤0.01mm are machined on the upper end face of the adjusting block 13, which are used to mate with the fourth screw 14 and the fifth screw 21, respectively. The fourth screw 14 (model M5×10) passes through the threaded hole of the adjusting block 13 and is fastened to the lower end face of the first guide post 12. This ensures that the first guide post 12 moves axially along the first guide sleeve 11 without jamming or shaking. Similarly, the fifth screw 21 (model M5×10) passes through the other threaded hole of the adjusting block 13 and is fastened to the lower end face of the second guide post 22. The second guide post 22 and the second guide sleeve 23 also use a clearance fit, and the parallelism error of the axes of the first guide post 12 and the second guide post 22 is controlled within 0.005mm, ensuring the horizontal movement accuracy of the subsequent fixing block 10 and avoiding uneven preload transmission due to guide post axis misalignment.

[0026] In this invention, the outer circumferential surfaces of the first guide sleeve 11 and the second guide sleeve 23 are fixedly connected to the guide block. The guide block can be made of 6061 aluminum alloy, which reduces the overall weight of the equipment while ensuring structural strength. Its length is adapted to the center distance between the first guide sleeve 11 and the second guide sleeve 23. At the same time, the guide block can limit the relative position of the first guide sleeve 11 and the second guide sleeve 23, preventing circumferential displacement during axial movement and ensuring the stability of the fit between the guide post and the guide sleeve.

[0027] According to a preferred embodiment of this utility model, the upper end face of the first guide post 12 can be machined with a countersunk hole with a depth of 3mm. The first screw 8 passes through the through hole of the fixing block 10 and is screwed into the countersunk hole of the first guide post 12 to fix the fixing block 10 and the first guide post 12. Correspondingly, the upper end face of the second guide post 22 is also machined with a countersunk hole with a depth of 3mm. The seventh screw 26 passes through another through hole of the fixing block 10 and is screwed into the countersunk hole of the second guide post 22 to fix the fixing block 10 and the second guide post 22 simultaneously. At the same time, the fixing block 10 can be made of steel to improve its wear resistance and impact resistance, and avoid the decrease in positioning accuracy due to wear after long-term use. In addition, the upper end face of the fixing block 10 is machined with a positioning groove with a width adapted to the second positioning block 35 and a groove depth of 5mm to realize the quick positioning and installation of the second positioning block 35.

[0028] During implementation, the upper surface of the fixing block 10 is secured to the second positioning block 35 via the eighth screw 27 and the ninth screw 7, both M6×15 socket head cap screws, symmetrically distributed on both sides below the second positioning block 35. It should be noted that the inner hole dimensions of both the first positioning block 4 and the second positioning block 35 are adapted to the outer ring size of the bearing assembly 29 to be tested, and the inner hole surface roughness is low, ensuring a good fit between the outer ring of the bearing assembly 29 and the inner hole of the positioning block, avoiding excessive gaps that could affect measurement accuracy. Simultaneously, the edges of the inner holes are rounded to prevent scratching the outer ring surface during bearing assembly 29 installation.

[0029] To facilitate easy adjustment, an adjustment device is installed on the base plate 15 to adjust the gap between the fixing block 10 and the adjusting block 13. This adjustment device is the core structure for achieving axial preload of the bearing assembly 29, and is specifically as follows: A threaded hole is machined at the center of the base plate 15, through which the adjusting bolt 17 passes and is movably mounted on the base plate 15. Simultaneously, the top of the adjusting bolt 17 has a top ball 18 for limiting the maximum storage diameter. This top ball 18 is made of bearing steel and its surface is polished to reduce the coefficient of friction with the guide rod 19 and prevent wear after long-term use. Furthermore, a cylindrical storage space is provided below the fixing block 10, in which a disc spring 20 is installed. Its spring force parameter is set according to the preload requirement of the bearing assembly 29 to be tested, typically 50-200N, to ensure a stable preload. Furthermore, a guide rod 19 is inserted into the center hole of the disc spring 20. The material of the guide rod 19 is the same as that of the fixing block 10, and its lower end extends to the corresponding position of the guide block. The length of the guide rod 19 is adapted to the depth of the storage space and the thickness of the guide block. A secondary guide groove adapted to the guide rod 19 is opened on the guide block. The lower end of the guide rod 19 is inserted into the secondary guide groove, and the guide rod 19 and the secondary guide groove are clearance-fitted to ensure the smooth axial movement of the guide rod 19 along the secondary guide groove. Correspondingly, a main guide groove coaxial with the adjusting bolt 17 is opened on the adjusting block 13. The upper end of the adjusting bolt 17 is connected to the main guide groove. The coaxiality error between the main guide groove and the secondary guide groove is ≤0.008mm, ensuring that the force transmission direction is accurate when the adjusting bolt 17 rotates, and avoiding the guide rod 19 from getting stuck due to coaxiality error.

[0030] During use, when the adjusting bolt 17 is rotated, it moves axially along the threaded hole of the base plate 15. The thread helix angle is 3° for easy and labor-saving operation. This causes the top ball 18 to push the guide rod 19. Guided by the secondary guide groove and the main guide groove, the guide rod 19 moves upward, compressing the disc spring 20. The disc spring 20 then undergoes elastic deformation and applies an upward force to the fixing block 10. This force is then transmitted sequentially through the fixing block 10 and the second positioning block 35 to the outer ring of the bearing assembly 29, ultimately applying axial preload to the bearing assembly 29. After preload is applied, rotating the adjusting bolt 17 in the opposite direction causes the disc spring 20 to recover its deformation under its own elastic force. This resets the guide rod 19, the top ball 18, and the adjusting bolt 17, releasing the preload on the bearing assembly 29.

[0031] Furthermore, to facilitate the operator's rotation of the adjusting bolt 17, its lower end is fixedly connected to the handwheel 16 via a flat key. The handwheel 16 can be made of ABS engineering plastic with a non-slip textured surface. A rubber non-slip sleeve can also be fitted to its outer circumference to improve operator comfort and prevent slippage due to sweaty hands. During implementation, the diameter of the handwheel 16 can be set to 180mm. Based on the lever principle, the force required for the operator to rotate the adjusting bolt 17 can be reduced to 5-10N, achieving labor-saving operation. Additionally, graduations can be engraved on the handwheel 16. This allows the operator to record the rotation angle of the adjusting bolt 17, enabling repeatable adjustments to the preload of different bearing components 29. Specifically, the graduation accuracy is 0.5°, with one revolution corresponding to an axial movement of 1.5mm for the adjusting bolt 17.

[0032] In practical implementation, an annular limiting area is formed between the first positioning block 4 and the second positioning block 35, the width of which matches the thickness of the outer ring of the bearing assembly 29. A mandrel 37 is installed within this limiting area. The mandrel 37 is made of alloy structural steel, heat-treated, and then chrome-plated with a chrome layer thickness of 0.01-0.02 mm to improve its corrosion resistance and surface hardness, preventing wear caused by long-term friction with the inner ring of the bearing. Simultaneously, the axis of the mandrel 37 coincides with the inner hole axes of the first positioning block 4 and the second positioning block 35, ensuring the coaxiality of the inner and outer rings of the bearing assembly 29 and preventing measurement errors due to mandrel misalignment. In use, a measuring ring 33 is fitted onto the mandrel 37 to hold the bearing rollers to be tested. Its inner diameter matches the outer diameter of the mandrel 37, and its outer diameter matches the inner diameter of the inner ring of the bearing assembly 29. Three cylindrical locating pins 36 are evenly distributed on the inner wall of the measuring ring 33. The three locating pins 36 are evenly distributed circumferentially at 120°. Their function is to circumferentially position the bearing rollers placed on the measuring ring 33, prevent the bearing rollers from shifting circumferentially during the measurement process, and ensure that the bearing rollers are subjected to uniform force during the measurement. At the same time, the top of the locating pins 36 is rounded to prevent scratching the surface of the bearing rollers.

[0033] Furthermore, the measuring ring 33 and the second positioning block 35 are detachably fixedly connected. Specifically, the upper end face of the measuring ring 33 is machined with three evenly distributed through holes, and the lower end face of the second positioning block 35 is machined with corresponding M5 threaded holes. The locking screw 34 passes through the through holes of the measuring ring 33 and is screwed into the threaded holes of the second positioning block 35, thus fixing the measuring ring 33 and the second positioning block 35. This connection method facilitates the replacement of the measuring ring 33 according to the size of the bearing rollers to be tested, improving the versatility of the equipment.

[0034] During use, the outer circumferential surface of the mandrel 37 mates with the inner hole of the rotating shaft 32. During measurement, the rotating shaft 32 can be driven to rotate around the mandrel 37 by external force (such as manual rotation by the operator), thereby causing the bearing rollers to rotate. This ensures that the bearing rollers receive uniform axial preload at different circumferential positions, avoiding measurement errors caused by uneven local force on the rollers. This is particularly suitable for batch testing, as continuous rotation of the rotating shaft 32 enables rapid measurement of multiple bearings, improving testing efficiency.

[0035] For ease of subsequent data acquisition, a mounting base 31 is fixed to the side wall of housing 1 using hexagonal socket screws. The mounting base 31 has clamping holes for fixing the dial indicator 30. Simultaneously, an M3 set screw is provided on the wall of the clamping hole to lock the dial indicator 30 within the clamping hole, preventing displacement due to vibration or external force during measurement. Furthermore, the dial indicator 30 is a model with an accuracy of 0.001 mm. Its probe contacts the outer circumferential surface of the measuring ring 33 via an elastic contact, and the probe's direction is consistent with the radial direction of the measuring ring 33, ensuring accurate capture of the radial deformation of the measuring ring 33. When the bearing assembly 29 expands radially under axial preload, it causes the measuring ring 33 to deform radially synchronously. The probe of the dial indicator 30 displaces with the deformation of the measuring ring 33, and the specific radial expansion amount is read from the dial of the dial indicator 30. This value can be used to subsequently calculate the required interference fit of the bearing assembly 29.

[0036] To facilitate handling or moving of equipment, a first handle 6 and a second handle 25 are respectively installed on the two side walls of the housing 1. Specifically, two M6 threaded holes are machined on one side wall of the housing 1. The third screw 5 and the second screw 9 are both M6×12 socket head cap screws, which pass through the two mounting holes of the first handle 6 and are screwed into the threaded holes of the housing 1 to fix the first handle 6 to the housing 1. Similarly, two M6 threaded holes are machined at the corresponding positions on the other side wall of the housing 1. The sixth screw 24 and the tenth screw 28 are both M6×12 socket head cap screws, which pass through the two mounting holes of the second handle 25 and are screwed into the threaded holes of the housing 1 to fix the second handle 25. At the same time, both the first handle 6 and the second handle 25 are made of ABS material, and their shape is designed with an arc structure, the curvature of which is adapted to the curvature of the human hand. Furthermore, the two handles are symmetrically arranged to ensure balanced force on the equipment during handling, avoiding tilting that could damage internal components, and are especially suitable for transferring equipment between different workstations in the workshop.

[0037] The measurement process of this embodiment is roughly as follows: Based on the model of the bearing assembly 29 to be tested, select a first positioning block 4 and a second positioning block 35 with matching inner hole dimensions. Fix the first positioning block 4 to the top of the housing 1 using the first bolt 2 and the second bolt 3, and fix the second positioning block 35 to the fixing block 10 using the eighth screw 27 and the ninth screw 7. Simultaneously, select a suitable measuring ring 33, fix it to the lower end of the second positioning block 35 using screws 34, and check that the positioning pins 36 on the inner wall of the measuring ring 33 are undamaged, undeformed, and free of oil or impurities on their surface.

[0038] During workpiece installation, the inner ring of the tapered cylindrical roller bearing to be tested (i.e., bearing assembly 29) is fitted onto the mandrel 37. The rollers of the bearing assembly 29 are then placed one by one into the measuring ring 33, ensuring that each roller is in contact with the locating pin 36 on the inner wall of the measuring ring 33. Subsequently, the mandrel 37, together with the bearing assembly 29, is placed into the limiting area between the first locating block 4 and the second locating block 35, ensuring that the outer ring of the bearing assembly 29 is tightly fitted with the inner holes of the first locating block 4 and the second locating block 35. During this process, the outer ring can be slightly rotated to confirm that there is no jamming.

[0039] To debug the equipment, rotate the dial of the dial indicator 30 until its pointer returns to zero. Check all components of the adjustment device, rotate the handwheel 16, and observe whether the adjusting bolt 17 and guide rod 19 move freely (without jamming or abnormal noise). Check whether the disc spring 20 can deform and reset normally. After confirming that all components are in normal condition, return the handwheel 16 to its initial position.

[0040] Next, preload and measurement are performed. Slowly rotate handwheel 16 clockwise (rotation speed ≤ 1 revolution / second), causing adjusting bolt 17 to move upwards. Top ball 18 pushes guide rod 19, guide rod 19 compresses disc spring 20, and disc spring 20 applies axial preload to fixed block 10. When handwheel 16 reaches the preset scale, stop rotating and maintain the preload state for 3-5 seconds. At this time, under the action of axial preload, the rollers of bearing assembly 29 drive the inner ring to move along the conical surface of spindle 37, causing the outer ring of bearing assembly 29 to expand radially, thereby causing the measuring ring 33 to deform radially synchronously. Afterwards, read the value on the dial of dial indicator 30, record the value, repeat the measurement 3 times, and take the average value as the final radial expansion amount.

[0041] For interference calculation, the required interference of bearing assembly 29 can be calculated by combining the previously read average radial expansion value with the design clearance value of the outer ring of bearing assembly 29 in the spindle housing to be assembled, using the formula "interference = radial expansion - design clearance compensation value".

[0042] Furthermore, the directions or positional relationships described in this utility model are based on the directions or positional relationships shown in the accompanying drawings. They are only for the purpose of facilitating the description of this utility model and simplifying the description, and are not intended to indicate or imply that the device or structure referred to must have a specific orientation, or to operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the technical principles of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A mechanical comparator suitable for bearing testing, comprising a housing (1), characterized in that: The top of the box (1) is fixedly installed with a first positioning block (4) by a first bolt (2) and a second bolt (3), and the bottom of the box (1) is fixedly connected with a bottom plate (15). An adjusting block (13) is fixedly installed inside the housing (1). The adjusting block (13) is connected to a first guide post (12) by a fourth screw (14). A first guide sleeve (11) is provided on the outer sleeve of the first guide post (12). The adjusting block (13) is connected to the second guide post (22) by the fifth screw (21), and the second guide post (22) is covered with a second guide sleeve (23). A guide block is connected between the first guide sleeve (11) and the second guide sleeve (23); a fixing block (10) is fixedly installed on the upper end of the first guide post (12) and the second guide post (22) respectively by the first screw (8) and the seventh screw (26); the fixing block (10) is connected to the second positioning block (35) by the eighth screw (27) and the ninth screw (7). The inner diameters of the first positioning block (4) and the second positioning block (35) are matched with the bearing assembly (29) to be tested. An adjustment device is installed on the base plate (15) to adjust the gap between the fixing block (10) and the adjustment block (13).

2. The mechanical comparator for bearing testing according to claim 1, characterized in that: The first positioning block (4) and the second positioning block (35) form a limiting area, and a mandrel (37) is installed in the limiting area; a measuring ring (33) is sleeved on the mandrel (37); and a number of positioning pins (36) are distributed on the inner wall of the measuring ring (33).

3. The mechanical comparator for bearing testing according to claim 2, characterized in that: The measuring ring (33) is connected to the second positioning block (35) by a locking screw (34).

4. The mechanical comparator for bearing testing according to claim 1, characterized in that: The spindle (37) is fitted with a rotating shaft (32).

5. The mechanical comparator for bearing testing according to claim 1, characterized in that: The adjustment device includes an adjustment bolt (17) that is movably inserted on the base plate (15). A storage space is provided below the fixed block (10), and a disc spring (20) is installed in the storage space. A guide rod (19) is inserted through the disc spring (20). A secondary guide groove is provided at the corresponding position of the guide block, and the lower end of the guide rod (19) is inserted into the secondary guide groove. A top ball (18) is distributed at the top of the adjustment bolt (17), and the top ball (18) is movably placed in the secondary guide groove. A main guide groove is provided at the corresponding position of the adjustment block (13), and the adjustment bolt (17) is connected to the main guide groove. The main guide groove and the secondary guide groove are coaxial. When the adjustment bolt (17) rotates, axial preload is applied to the bearing assembly (29) through the guide rod (19), the top ball (18), and the adjustment bolt (17).

6. The mechanical comparator for bearing testing according to claim 5, characterized in that: A handwheel (16) is mounted on the adjusting bolt (17).

7. The mechanical comparator for bearing testing according to claim 1, characterized in that: The housing (1) is equipped with a dial indicator (30) via a mounting base (31).

8. The mechanical comparator for bearing testing according to claim 1, characterized in that: A first handle (6) is fixedly installed on one side of the box (1) by a third screw (5) and a second screw (9); a second handle (25) is fixedly installed on the other side of the box (1) by a sixth screw (24) and a tenth screw (28).

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