CN211926720U

CN211926720U - Thrust gap adjusting device for mounting paired ball bearings

Info

Publication number: CN211926720U
Application number: CN202020977184.8U
Authority: CN
Inventors: 廖晨曦; 朱如义; 路璐; 刘亚平; 董结青; 袁罡
Original assignee: Ma'anshan Dangtu Power Generation Co ltd
Current assignee: Ma'anshan Dangtu Power Generation Co ltd
Priority date: 2020-06-01
Filing date: 2020-06-01
Publication date: 2020-11-13
Anticipated expiration: 2030-06-01

Abstract

The utility model discloses a thrust clearance adjusting device for ball bearing installation in pairs belongs to the bearing and measures technical field. The utility model comprises an inner ring and an outer ring which are arranged from inside to outside in sequence, wherein the outer ring is sleeved on the periphery of the inner ring, the inner ring comprises a hollow cylinder, the upper end and the lower end of the hollow cylinder in the axial direction are respectively provided with an inner ring pressing plate and an inner ring base, the inner ring pressing plate and the inner ring base are connected through an inner connecting column, and the top of the inner ring pressing plate is also provided with a dial indicator; the outer ring comprises an outer ring pressing ring and an outer ring base, the center of the outer ring pressing ring and the center of the outer ring base are both provided with installation cavities for installing the inner ring, and the outer ring pressing ring and the outer ring base are connected through an outer connecting column. The utility model aims to overcome when current angular contact ball bearing assembly thrust clearance measure with the complicated hard not enough of adjustment process, can try on the assembly alone with the angular contact ball bearing of installing in pairs for the speed of measurement and adjustment.

Description

Thrust gap adjusting device for mounting paired ball bearings

Technical Field

The utility model relates to a bearing measures technical field, more specifically says, relates to a thrust clearance adjusting device for installation of ball bearing in pairs.

Background

In power generation enterprises, a large axial flow fan and a large water pump are main auxiliary machines of a power plant, and a bearing is one of the most main parts of rotating equipment. In all rotating shaft devices, the rotating shaft is typically supported for rotation by bearings, which are mounted in bearing housings. When the bearing of the equipment is damaged or reaches the use limit, the bearing needs to be replaced. Inside each bearing housing, several bearings are usually used, which are mounted on the rotating shaft, wherein the bearings for balancing the axial thrust are mostly angular contact ball bearings mounted in pairs. An inner space ring and an outer space ring are arranged between the two angular contact ball bearings, and the total thrust clearance of the bearing group reaches a qualified range by measuring and adjusting the thicknesses of the inner space ring and the outer space ring during assembly.

The conventional assembly sequence is to hot-load (electrical or oil) the bearings onto the rotating shaft and then hoist them into the bearing housing as required by the process. And (3) testing and assembling all parts of the bearing box, measuring the maximum value of the relative displacement between the end face of the main shaft and the end cover of the bearing box by using a dial indicator, and judging whether the gap is qualified. And calculating the quantity to be adjusted, disassembling the bearing again, taking out the outer space ring, finally, performing finish machining on the outer space ring according to the calculated value, and repeating the steps until the total thrust gap is qualified. Therefore, it is a continuous objective in the industry to design a simple and practical thrust gap adjusting device for the installation of paired ball bearings.

Through retrieval, a large number of patents have been published on bearing measuring devices, such as chinese patent application No.: 2015204573854, the name of invention creation is: the utility model provides a thrust bearing axial spacing adjusting device in pairs, this application discloses a thrust bearing axial spacing adjusting device in pairs, including thrust bearing, thrust bearing is the symmetry setting from top to bottom, and thrust bearing's bottom is equipped with the support ring, and the lower part of support ring is equipped with the bottom plate, and the center of bottom plate is equipped with the bolt, bolt and bottom plate fixed connection, and the other end of bolt is equipped with the nut, is equipped with outer adjusting ring and interior spacer between thrust bearing, and thrust bearing's upper portion is equipped with the side pressure board, and the upper portion of side pressure board is equipped with the main clamp plate.

As another example, chinese patent application No.: 2015204573854, the name of invention creation is: the utility model provides a bearing axial clearance adjustment frock, this application discloses a bearing axial clearance adjustment frock, wears to be equipped with the transmission shaft in the bearing, is equipped with lock nut on the transmission shaft, and axial clearance adjustment frock includes clamp plate, staple bolt, and the transmission shaft top is located to the clamp plate, and the staple bolt cover is located on the bearing and the backstop is in the shaft shoulder below, is connected with double-end screw between clamp plate, the staple bolt, is equipped with the percentage table on the bearing, and the measuring probe and the transmission shaft of percentage table are connected.

Both of the above solutions are good explorations for bearing measuring devices, but the exploration for bearing measuring devices in the industry has never been stopped.

SUMMERY OF THE UTILITY MODEL

1. Technical problem to be solved by the utility model

The utility model aims to overcome the not enough that thrust clearance measurement and adjustment process are complicated hard when current angular contact ball bearing assembly, provide a thrust clearance adjusting device for installation of ball bearing in pairs, can try on the assembly alone with the angular contact ball bearing of installing in pairs, reduced the technology step for the speed of measurement and adjustment.

2. Technical scheme

In order to achieve the above purpose, the utility model provides a technical scheme does:

the utility model discloses a thrust clearance adjusting device for installation of ball bearing in pairs, include inner circle and outer lane that sets gradually from inside to outside, the outer lane cover is established in the inner circle periphery, wherein the inner circle includes hollow cylinder, and hollow cylinder axial upper and lower both ends are provided with inner circle clamp plate and inner circle base respectively, and the outside edge position of inner circle clamp plate and inner circle base all extends beyond hollow cylinder's periphery, links to each other through the inner connecting post between inner circle clamp plate and the inner circle base, and inner circle clamp plate top still is provided with the percentage table; the outer ring comprises an outer ring pressing ring and an outer ring base which are arranged in parallel from top to bottom, the centers of the outer ring pressing ring and the outer ring base are provided with installation cavities for installing inner rings, and the outer ring pressing ring and the outer ring base are connected through an outer connecting column.

As a further improvement, the bottom of outer joint post is fixed on the outer lane base, and the top of outer joint post is provided with the screw thread section, set up with outer joint post matched with through-hole on the outer lane clamping ring with the corresponding position of outer joint post, and this screw thread section passes the through-hole on the outer lane clamping ring and links together outer lane clamping ring and outer lane base through outer lane lock nut.

As a further improvement, the outer ring base is provided with a plurality of outer connecting columns around the circumferential uniform interval.

As a further improvement, the bottom of inner connecting post is fixed on the inner circle base, and the top of inner connecting post is provided with the screw thread section, and inner circle clamp plate is last to offer with inner connecting post matched with through-hole with the corresponding position of inner connecting post, and this screw thread section passes the through-hole of inner circle clamp plate and links together inner circle clamp plate and inner circle base through inner circle lock nut.

As a further improvement, the dial indicator is fixed at the top of the inner ring pressing plate through the fixing unit, and the position of the measuring head at the bottom of the dial indicator corresponds to the position of the outer ring pressing ring.

As a further improvement, the inner ring pressing plate and the inner ring base are of a circular structure, and the diameters of the inner ring pressing plate and the inner ring base are larger than the diameter of the hollow cylinder.

As a further improvement, the outer ring compression ring and the outer ring base are of an annular structure.

As a further improvement, the fixing unit comprises a fixing base and a fixing rod fixed on the top of the inner ring pressing plate, one end of the fixing rod is connected with the fixing base, and the other end of the fixing rod is connected with the dial indicator.

As a further improvement, the dead lever is including setting up the canned paragraph at the unable adjustment base top, and wherein the canned paragraph top is outwards extended and is provided with the support section, supports section bottom downwardly extending and is provided with the linkage segment, and the bottom of linkage segment links to each other with the percentage table.

3. Advantageous effects

Adopt the technical scheme provided by the utility model, compare with prior art, have following beneficial effect:

(1) the utility model discloses a thrust clearance adjusting device for ball bearing installation in pairs can try on two angular contact ball bearings of installing in pairs alone and assemble, under the prerequisite that reduces the step of traditional handicraft, separates and guarantees the accurate thrust clearance of measuring for the speed of measurement and adjustment.

(2) The utility model discloses a thrust clearance adjusting device for ball bearing installation in pairs has alleviateed the equipment weight of measuring in the adjustment process, greatly reduced the impaired and personnel injured's risk of part, also need not the cooperation of jack-up hoist and mount, reduced the input of machinery.

(3) The utility model discloses a thrust clearance adjusting device for ball bearing installation in pairs falls bearing box assembly number of times to minimumly, and the possibility significantly reduced of fastener and fitting piece wearing and tearing has reduced extra work load.

(4) The utility model discloses a thrust clearance adjusting device for ball bearing installation in pairs, its simple structure, practicality are high, and the cost of manufacture is low, safe and reliable.

Drawings

Fig. 1 is a schematic view of a thrust gap adjusting device for mounting paired ball bearings according to the present invention;

FIG. 2 is a schematic structural view of section A-A of FIG. 1;

fig. 3 is a schematic structural diagram of a thrust gap adjusting device for paired ball bearing installation according to the present invention.

The reference numerals in the schematic drawings illustrate:

100. an outer ring; 110. an outer ring compression ring; 111. an outer ring locking nut; 112. an outer connecting column; 120. an outer ring base; 130. supporting the boss; 200. an inner ring; 210. an inner ring pressing plate; 211. an inner ring lock nut; 212. an inner connecting post; 220. a hollow cylinder; 230. an inner ring base;

300. angular contact ball bearings; 310. a bearing outer race; 311. an outer space ring; 320. a bearing inner race; 321. an inner spacer ring; 330. a steel ball; 400. a dial indicator; 410. a measuring head; 500. a fixing unit; 510. fixing the rod; 520. and fixing the base.

Detailed Description

For a further understanding of the present invention, reference will be made to the following detailed description taken in conjunction with the accompanying drawings.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

The present invention will be further described with reference to the following examples.

Example 1

As shown in fig. 1 and 2, the angular contact ball bearing 300 includes a bearing inner ring 320 and a bearing outer ring 310 arranged from inside to outside, and the bearing inner ring 320 and the bearing outer ring 310 are connected by a steel ball 330. Most of the bearings for balancing the axial thrust are the angular contact ball bearings 300 installed in pairs, the inner spacer 321 and the outer spacer 311 are installed between the two angular contact ball bearings 300, that is, the inner spacer 321 is installed between the inner bearing rings 320 of the two angular contact ball bearings 300 installed in pairs, the outer spacer 311 is installed between the outer bearing rings 310 of the two angular contact ball bearings 300, and the outer spacer 311 needs to be measured and adjusted during assembly, so that the total thrust clearance of the bearing set reaches a qualified range. The conventional angular contact ball bearing 300 is assembled by first hot-fitting (electrical heating or oil heating) the angular contact ball bearing 300 onto the main shaft and then hanging the angular contact ball bearing into a bearing box according to the process requirements. After all the components in the bearing box are completely assembled through trial assembly, the maximum value of the relative displacement between the end face of the main shaft and the end cover of the bearing box is measured through the dial indicator 400, and whether the gap is qualified or not is judged. And then calculating the quantity to be adjusted, disassembling the angular contact ball bearing 300 and the bearing box again, taking out the outer spacing ring 311 between the two angular contact ball bearings 300, finally, performing finish machining on the thickness of the outer spacing ring 311 according to the calculated value, and repeating the steps until the finally measured total thrust clearance of the angular contact ball bearing 300 meets the requirement. The above process steps may need to be repeated at least 2 to 3 times, or even more, resulting in a huge assembly effort and long assembly time. Meanwhile, the weight of the bearing box of the large axial flow fan and the water pump in the power plant reaches 1 ton to 2 tons, and the specification and the weight of the angular contact ball bearing 300 are also large. In the assembling process, the hoisting and hoisting are matched, the bearing box needs to be rolled for many times, and very high potential safety hazards are brought to equipment and workers. Repeatedly tear open, adorn the operation to the bearing box, not only can cause the damage of the inside accurate fit part of bearing box, greatly reduced the life of equipment, still additionally increased equipment cost of maintenance. The thrust clearance adjusting device for mounting the paired ball bearings of the embodiment can solve the problems, and the thrust clearance adjusting device for mounting the paired ball bearings of the embodiment is used for directly and independently trial-assembling the paired angular contact ball bearings 300, so that the process steps are reduced, and the measuring and adjusting speed is increased.

With reference to fig. 1 to 3, the thrust clearance adjusting device for mounting paired ball bearings of this embodiment includes an inner ring 200 and an outer ring 100, which are sequentially arranged from inside to outside, the outer ring 100 is sleeved on the periphery of the inner ring 200, wherein the inner ring 200 includes a hollow cylinder 220, the upper and lower axial ends of the hollow cylinder 220 are respectively provided with an inner ring pressure plate 210 and an inner ring base 230, the outer edge positions of the inner ring pressure plate 210 and the inner ring base 230 both extend beyond the periphery of the hollow cylinder 220, specifically, as shown in fig. 3, the inner ring pressure plate 210 and the inner ring base 230 in this embodiment are both circular structures, and the diameters of the inner ring pressure plate 210 and the inner ring base 230 are both larger than the diameter of the. The inner ring base 230 and the hollow cylinder 220 are of an integrally formed structure, the diameter of the inner ring base 230 is larger than that of the hollow cylinder 220, a reserved space is convenient to place the bearing inner ring 320, when the inner ring pressing device is used, the inner walls of the bearing inner rings 320 of the two assembled angular contact ball bearings 300 can be attached to the outer side wall of the hollow cylinder 220, the bottom of the bearing inner ring 320 below is placed on the inner ring base 230, and meanwhile, the integral height of the two bearing inner rings 320 and the middle inner spacer 321 is larger than that of the hollow cylinder 220, so that the inner ring pressing plate 210 can compress the integral inner sides of the two assembled angular contact ball bearings 300 from the upper side of the bearing inner rings 320 above. A lifting ring (not shown) is further disposed on the top of the inner ring pressure plate 210, so that a steel wire rope can be used to pass through the lifting ring to lift the inner ring 200 during measurement.

As shown in fig. 2, in the present embodiment, the inner ring pressing plate 210 and the hollow cylinder 220 are detachably connected, so as to conveniently place and press the bearing inner ring 320, specifically, in the present embodiment, the inner ring pressing plate 210 and the inner ring base 230 are connected through the inner connecting columns 212, specifically, in the present embodiment, the bottoms of the inner connecting columns 212 are fixed on the inner ring base 230, the tops of the inner connecting columns 212 are provided with threaded sections, through holes matched with the inner connecting columns 212 are formed in positions on the inner ring pressing plate 210 corresponding to the inner connecting columns 212, the threaded sections penetrate through the through holes on the inner ring pressing plate 210 and connect the inner ring pressing plate 210 and the inner ring base 230 together through the inner ring locking nut 211, and the threaded connection is adopted, so that it is simple and convenient, and when in use, the whole inner sides of the two assembled angular contact ball bearings 300 are sleeved on, thereby integrally fixing the assembled two angular contact ball bearings 300 inside to the inner ring 200.

As shown in fig. 1, in this embodiment, the top of the inner ring pressure plate 210 is further provided with a dial indicator 400 for measuring a total thrust gap between the two angular contact ball bearings 300, so as to conveniently adjust the thickness of the outer cage ring 311 at any time, and finally make the total thrust gap between the two assembled angular contact ball bearings 300 meet the assembly requirement. Specifically, in this embodiment, the dial indicator 400 is fixed on the top of the inner ring pressing plate 210 through the fixing unit 500, and the position of the measuring head 410 at the bottom of the dial indicator 400 corresponds to the position of the outer ring pressing ring 110, when in use, the measuring head 410 at the bottom of the dial indicator 400 is always pressed on the top of the outer ring pressing ring 110, so that the maximum displacement difference between the bearing inner ring 320 and the bearing outer ring 310, that is, the total thrust gap, can be measured.

As shown in fig. 2 and fig. 3, in this embodiment, the outer ring 100 includes an outer ring press ring 110 and an outer ring base 120 that are arranged in parallel from top to bottom, and an installation cavity for installing the inner ring 200 is provided at the center of each of the outer ring press ring 110 and the outer ring base 120, specifically, in this embodiment, each of the outer ring press ring 110 and the outer ring base 120 is of an annular structure, the diameter of the outer ring press ring 110 is greater than that of the inner ring press plate 210, the diameter of the outer ring base 120 is greater than that of the inner ring base 230, when in use, the bottom of the whole outer side of two assembled angular contact ball bearings 300 is placed on the outer ring base 120, and the top of the upper bearing outer ring 310 is pressed by the outer ring press ring 110, so that the two.

As shown in fig. 2, in the present embodiment, the outer ring press ring 110 is connected to the outer ring base 120 through the outer connecting column 112. Specifically, in this embodiment, the bottom of the outer connecting column 112 is fixed on the outer ring base 120, a threaded section is disposed at the top of the outer connecting column 112, a through hole matched with the outer connecting column 112 is formed in a position, corresponding to the outer connecting column 112, on the outer ring press ring 110, and the threaded section penetrates through the through hole on the outer ring press ring 110 and connects the outer ring press ring 110 and the outer ring base 120 together through the outer ring lock nut 111. Specifically, be provided with a plurality of outer joint posts 112 around the even interval of circumference on outer ring base 120 in this embodiment, specifically, as shown in fig. 1, be provided with 3 outer joint posts 112 around the even interval of circumference on outer ring base 120 in this embodiment, conveniently fix the bearing inner race 310 of top diversely, fixed effect is more stable, difficult emergence not hard up phenomenon during the measurement.

When the adjusting and measuring device is used specifically, firstly, the adjusting and measuring device of the embodiment is placed on the ground, and the two angular contact ball bearings 300 installed in pair are assembled into an integral structure and then placed on the adjusting and measuring device of the embodiment, so that the inner sides of the two assembled integral angular contact ball bearings 300 are attached to the inner ring 200, the outer sides of the two assembled integral angular contact ball bearings 300 are placed on the outer ring 100, and the inner and outer sides of the two assembled integral angular contact ball bearings 300 are fixed on the inner ring base 230 and the outer ring base 120 through the inner ring pressing plate 210 and the outer ring pressing ring 110 respectively; then the measuring head 410 of the dial indicator 400 is pressed on the top of the outer ring press ring 110, the initial value of the dial indicator 400 is adjusted and recorded, and a steel wire rope penetrates through a lifting ring at the top of the inner ring pressing plate 210, a jack is used for providing lifting power in the lifting process, the labor is saved, when the inner ring 200 and the two bearing inner rings 320 which are attached to the outer side of the inner ring 200 are lifted upwards and vertically to a certain position, while the two outer bearing rings 310 located at the outer side are still in the static state, the dial indicator 400 generates a change value relative to the initial value, the variation value is the maximum relative displacement difference between the inner ring pressing plate 210 and the outer ring pressing ring 110, and is also the maximum relative displacement difference between the bearing inner ring 320 and the bearing outer ring 310, this maximum relative displacement difference is the total thrust gap between the two angular contact ball bearings 300 that needs to be measured. If the measured total thrust clearance does not meet the use standard, only the inner ring lock nut 211 and the outer ring lock nut 111 on the measuring and adjusting device need to be disassembled, the two assembled angular contact ball bearings 300 can be easily taken out, the outer spacing ring 311 is taken out, and the thickness of the outer spacing ring 311 is processed and adjusted according to the calculated value. The measuring and adjusting device of the embodiment has the advantages of simple structure, high practicability, low manufacturing cost, safety and reliability. By adopting the measuring and adjusting device of the embodiment, the two angular contact ball bearings 300 installed in pairs can be independently subjected to trial assembly, so that the thrust clearance can be accurately measured on the premise of reducing the steps of the traditional process, and the measuring and adjusting speed is increased; the assembly times of the bearing box are reduced to the minimum, the possibility of abrasion of the fastener and the matching piece is greatly reduced, and the additional workload is reduced. Meanwhile, the weight of equipment in the measurement and adjustment process is reduced, the risks of damage of parts and injury of personnel are greatly reduced, the matching of hoisting and hoisting is not needed, and the investment of machinery is reduced.

Example 2

The structure of the thrust gap adjusting device for mounting paired ball bearings according to this embodiment is substantially the same as that of embodiment 1, and further, as shown in fig. 2, in this embodiment, the fixing unit 500 includes a fixing base 520 fixed to the top of the inner ring pressing plate 210 and a fixing rod 510, one end of the fixing rod 510 is connected to the fixing base 520, and the other end of the fixing rod 510 is connected to the dial indicator 400. The fixing rod 510 includes a fixing section disposed at the top of the fixing base 520, wherein a supporting section is disposed on the top of the fixing section in an outward extending manner, a connecting section is disposed on the bottom of the supporting section in a downward extending manner, and the bottom of the connecting section is connected to the dial indicator 400.

The present invention and its embodiments have been described above schematically, and the description is not limited thereto, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching of the present invention, without departing from the inventive spirit of the present invention, the person skilled in the art should also design the similar structural modes and embodiments without creativity to the technical solution, and all shall fall within the protection scope of the present invention.

Claims

1. A thrust clearance adjustment device for paired ball bearing installation characterized by: the inner ring pressing plate comprises an inner ring (200) and an outer ring (100) which are sequentially arranged from inside to outside, wherein the outer ring (100) is sleeved on the periphery of the inner ring (200), the inner ring (200) comprises a hollow cylinder (220), the upper end and the lower end of the hollow cylinder (220) in the axial direction are respectively provided with an inner ring pressing plate (210) and an inner ring base (230), the outer edge positions of the inner ring pressing plate (210) and the inner ring base (230) both extend beyond the periphery of the hollow cylinder (220), the inner ring pressing plate (210) and the inner ring base (230) are connected through an inner connecting column (212), and the top of the inner ring pressing plate (210) is also provided; outer lane (100) are including outer lane clamping ring (110) and outer lane base (120) of parallel arrangement from top to bottom, and the installation cavity that is used for installing inner circle (200) is all offered at the center of outer lane clamping ring (110) and outer lane base (120), and links to each other through outer joint pole (112) between outer lane clamping ring (110) and the outer lane base (120).

2. A thrust gap adjusting apparatus for paired ball bearing mounting according to claim 1, wherein: the bottom of the outer connecting column (112) is fixed on the outer ring base (120), the top of the outer connecting column (112) is provided with a threaded section, a through hole matched with the outer connecting column (112) is formed in the position, corresponding to the outer connecting column (112), of the outer ring pressing ring (110), and the threaded section penetrates through the through hole in the outer ring pressing ring (110) and connects the outer ring pressing ring (110) with the outer ring base (120) through the outer ring locking nut (111).

3. A thrust gap adjusting apparatus for paired ball bearing mounting according to claim 2, wherein: a plurality of outer connecting columns (112) are uniformly arranged on the outer ring base (120) at intervals around the circumferential direction.

4. A thrust gap adjusting apparatus for paired ball bearing mounting according to claim 1, wherein: the bottom of the inner connecting column (212) is fixed on the inner ring base (230), the top of the inner connecting column (212) is provided with a threaded section, a through hole matched with the inner connecting column (212) is formed in the position, corresponding to the inner connecting column (212), of the inner ring pressing plate (210), and the threaded section penetrates through the through hole in the inner ring pressing plate (210) and connects the inner ring pressing plate (210) and the inner ring base (230) together through the inner ring locking nut (211).

5. A thrust gap adjusting apparatus for paired ball bearing mounting according to claim 1, wherein: the dial indicator (400) is fixed on the top of the inner ring pressing plate (210) through the fixing unit (500), and the position of the measuring head (410) at the bottom of the dial indicator (400) corresponds to the position of the outer ring pressing ring (110).

6. A thrust gap adjusting apparatus for paired ball bearing mounting according to any one of claims 1 to 5, wherein: the inner ring pressing plate (210) and the inner ring base (230) are both of a circular structure, and the diameters of the inner ring pressing plate (210) and the inner ring base (230) are larger than the diameter of the hollow cylinder (220).

7. A thrust gap adjusting apparatus for paired ball bearing installation according to claim 6, wherein: the outer ring press ring (110) and the outer ring base (120) are both of annular structures.

8. A thrust gap adjusting apparatus for paired ball bearing installation according to claim 6, wherein: the fixing unit (500) comprises a fixing base (520) and a fixing rod (510), wherein the fixing base (520) and the fixing rod (510) are fixed to the top of the inner ring pressing plate (210), one end of the fixing rod (510) is connected with the fixing base (520), and the other end of the fixing rod (510) is connected with the dial indicator (400).

9. A thrust gap adjusting apparatus for paired ball bearing mounting according to claim 8, wherein: the fixing rod (510) comprises a fixing section arranged at the top of the fixing base (520), wherein the top of the fixing section extends outwards to form a supporting section, the bottom of the supporting section extends downwards to form a connecting section, and the bottom of the connecting section is connected with the dial indicator (400).