Tool special for centering two-end supporting type bearing seat and centering method

Abstract

The invention relates to the technical field of nuclear power, in particular to a special centering tool for a two-end-supported bearing seat and a centering method. The centering tool is semicircular, a groove is formed in the middle of the centering tool, and the thickness of the groove is matched with that of the bearing; a small boss is arranged on one side of the groove, and a large boss is arranged on the other side of the groove; the large boss is higher than the small boss, and the small boss is used for constraining the side face position of the bearing outer ring; the large boss is used for constraining the side face position of the bearing inner ring. The centering method comprises the following steps: mounting the bearing seat bracket; the bearing seat is of a center-split structure, and the lower half bearing seat is connected to the bearing seat support in a loose mode. The two bearings are installed at the shaft diameter positioning positions of the rotating shaft respectively and fixed through round nuts and lock washers; according to the technical scheme, the centering tool is used for fixing the inner ring and the outer ring of the bearing; the bearing is installed back into the lower half bearing seat, external force is continuously applied to the bearing seat, and the bearing seat is in the dynamic adjustment process until the bearing completely falls into the lower half bearing seat; a bolt is fastened between the lower half bearing seat and the bearing seat bracket; and the centering tool is removed, and the upper half bearing seat and the lower half bearing seat are connected and fixed. The inner ring and the outer ring of the bearing are ensured to be completely perpendicular to the rotating shaft and are fixed, and the bearings on the two sides can be centered conveniently.

Description

Technical Field

[0001] The invention relates to the field of nuclear power technology, and in particular to a special tool and a centering method for a bearing seat supported at both ends. Background Art

[0002] The bearing seats with two ends supported are commonly used in rotating machinery such as centrifugal fans and water pumps. The two support bearing seats are installed on both sides of the casing, that is, the impeller is placed between the two support bearings. It is a double-support type, and its advantage is that the movement is relatively balanced. At present, the bearing seats with two ends supported have the following problems:

[0003] 1. In actual engineering applications, there is no reliable way to ensure the concentricity of the bearing seat supported at both ends due to the obstruction of the impeller, which causes abnormal force on the rolling bearing installed in the bearing seat and aggravates wear and failure, seriously affecting the reliability of the equipment.

[0004] 2. The bearing seats with support at both ends are generally matched with spherical roller bearings. Because the bearings have their own aligning ability, it increases the difficulty of aligning the bearing seats on both sides. Summary of the invention

[0005] The technical problem to be solved by the present invention is to provide a special tool and method for centering a bearing seat with support at both ends, which ensures that the inner ring and outer ring of the bearing are completely vertical to the rotating shaft and fixed unchanged, so as to facilitate the mutual centering of the bearings on both sides.

[0006] The present invention provides a shaft alignment tool for a bearing seat with two ends supported, the alignment tool is semi-annular, with a groove in the middle, and the groove matches the thickness of the bearing;

[0007] One side of the groove is a small boss and the other side is a large boss;

[0008] The height of the large boss is greater than the height of the small boss,

[0009] The small boss is used to constrain the side position of the bearing outer ring;

[0010] The large boss is used to constrain the side position of the bearing inner ring.

[0011] In a specific embodiment of the present invention, a lifting lug is provided on the side wall of the centering tool.

[0012] In a specific embodiment of the present invention, the bottom of the ear is a screw which is screwed into the side wall.

[0013] The present invention provides a method for centering a shaft system of a bearing seat with two ends supported, comprising the following steps:

[0014] Step 1: Install the bearing support bracket;

[0015] Step 2: The bearing seat adopts a center-split structure, and the lower half of the bearing seat is loosely connected to the bearing seat bracket;

[0016] Step 3: Install the two bearings to the shaft diameter positioning positions respectively, and fix them with round nuts and locking washers;

[0017] Step 4: Use the centering tool described in the above technical solution to fix the inner ring and outer ring of the bearing;

[0018] Step 5: Install the bearing back into the lower bearing seat, and continue to apply external force to the bearing seat. The bearing seat is in a dynamic adjustment process until the bearing is completely inserted into the lower bearing seat.

[0019] Step 6: Tighten the bolts between the lower bearing seat and the bearing seat bracket;

[0020] Step 7: Remove the alignment tool and connect and secure the upper and lower bearing seats.

[0021] In a specific embodiment of the present invention, the bearing is a spherical roller bearing.

[0022] In a specific embodiment of the present invention, in step 3, after heating the bearings, the bearings are respectively installed at the shaft diameter positioning positions of the rotating shaft;

[0023] Install the locking washer and pre-tightening round nut at the same time;

[0024] After the bearing has cooled, tighten the round nut completely and bend the outer stop ear of the stop washer into the round nut groove.

[0025] In a specific embodiment of the present invention, the step 7 further includes: adding grease into the bearing and the bearing seat cavity;

[0026] After adding grease, tighten the fastening bolts on the center face of the bearing seat to connect and fix the upper bearing seat with the lower bearing seat.

[0027] In a specific embodiment of the present invention, in step 4, the small boss position of the centering tool is installed on the round nut side, and the large boss position is installed on the shaft diameter side of the rotating shaft.

[0028] Compared with the prior art, the present invention provides a special tool and method for centering a bearing seat with two ends supported. The bearing seat brackets on both sides of the impeller are first installed, and then the bearing seat is installed on the platform of the bearing seat bracket. The bearing seat and the bearing seat bracket are not fastened first to ensure that the bearing seat can move freely under the action of external force. After the axial positioning of the bearing is completed, the centering tool is installed on the bearings on both sides respectively. At this time, the outer ring and the inner ring of the bearing cannot be offset, thereby ensuring that the inner ring and the outer ring of the bearing are completely vertical to the rotating shaft and fixed unchanged. The bearings on both sides are slowly dropped back into the bearing seat. During the process of reinstalling the bearings, external force is continuously applied to the bearing seat, and the bearing seat is in a dynamic adjustment process. When the bearing falls completely into the bearing seat, the bearing seats on both sides realize the self-adjustment function. Tighten the anchor bolts of the bearing seat and the bearing seat bracket and the fastening bolts of the center face of the bearing seat, and finally, the centering tool that restricts the self-aligning ability of the bearing is conveniently disassembled by lifting the annular lifting ear upward.

[0029] The bearing seats and bearings at both ends that were reinstalled using this alignment tool can reduce the bearing temperature by about 10°C compared to conventional methods. The bearing grease condition is also significantly improved, and the blackening of the grease is significantly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 Three views of a special tool for centering a bearing seat with support at both ends provided by the present invention;

[0031] Figure 2 A three-dimensional diagram of a special tool for centering a bearing seat with two ends supported provided by the present invention;

[0032] Figure 3 A schematic diagram of a two-end supported bearing seat centering tool and a bearing assembly provided by the present invention;

[0033] Figure 4 A schematic diagram of a rotating machine using a bearing seat supported at both ends is provided. DETAILED DESCRIPTION

[0034] In order to further understand the present invention, the embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the present invention.

[0035] The embodiment of the present invention discloses a two-end supported bearing seat shaft alignment tool, such as Figure 1 and Figure 2 As shown, the centering tool is semi-circular with a groove in the middle, and the groove matches the thickness of the bearing;

[0036] One side of the groove is a small boss and the other side is a large boss;

[0037] The height of the large boss is greater than the height of the small boss,

[0038] The small boss is used to constrain the side position of the bearing outer ring;

[0039] The large boss is used to constrain the side position of the bearing inner ring.

[0040] A lifting lug is arranged on the side wall of the centering tool.

[0041] The bottom of the lifting ear is a screw which is screwed into the side wall.

[0042] The centering tool is used when a rotating machine with a bearing seat supported at both ends is debugged or dismantled for overhaul and reinstalled, and when the driving end and non-driving end bearing seats need to be adjusted and aligned.

[0043] The centering tool described in the present invention is particularly suitable for spherical roller bearings.

[0044] An embodiment of the present invention discloses a method for centering a shaft system of a bearing seat with two ends supported, comprising the following steps:

[0045] Step 1: Install the bearing support bracket;

[0046] Depending on the construction, if the bearing support bracket is fixed to the table plate by tightening bolts, you need to install the bearing support bracket first and tighten the bolts in place. If the bearing support bracket is welded to the table plate, the bearing support bracket cannot be adjusted.

[0047] Step 2: The bearing seat adopts a center-split structure, and the lower half of the bearing seat is placed on the bearing seat bracket platform. The lower half of the bearing seat is loosely connected to the bearing seat bracket without being tightened, so that the lower half of the bearing seat can move freely;

[0048] Step 3: Install the two bearings to the shaft diameter positioning positions respectively, and fix them with round nuts and locking washers;

[0049] Specifically, the bearing is heated by a bearing heater,

[0050] After heating the bearings, install the bearings to the shaft diameter positioning positions respectively;

[0051] Install the locking washer and pre-tightening round nut at the same time;

[0052] After the bearing has cooled, tighten the round nut completely and bend the outer stop ear of the stop washer into the round nut groove.

[0053] Step 4: Use the centering tool described in the above technical solution to fix the inner ring and outer ring of the bearing;

[0054] The screw of the lifting lug does not protrude from the groove of the centering tool. Hold the lifting lug and clamp the centering tool on the upper part of the spherical roller bearing. The small boss position of the centering tool is installed on the round nut side, and the large boss position is installed on the shaft diameter side. Both spherical roller bearings on the shaft need to be installed with special tools according to the above method.

[0055] Step 5: Install the bearing back into the lower bearing seat. The outer and inner rings of the spherical roller bearing cannot be offset, thus ensuring that the inner and outer rings of the spherical roller bearing are completely perpendicular to the shaft and fixed.

[0056] The external force is continuously applied to the bearing seat, and the bearing seat is in the process of dynamic adjustment. When the bearing is completely dropped into the bearing seat, the bearing seats on both sides realize the self-adjustment function.

[0057] Step 6: Tighten the bolts between the lower bearing seat and the bearing seat bracket, and ensure that the tightening bolt torque value meets the requirements;

[0058] Step 7: Remove the centering tool easily by lifting the lifting lug upwards.

[0059] Add grease to the bearing and bearing seat cavities;

[0060] After adding grease, tighten the fastening bolts on the center surface of the bearing seat to connect and fix the upper bearing seat with the lower bearing seat, and ensure that the fastening bolt torque value meets the requirements.

[0061] The above method realizes the self-positioning function of the bearing seat center on both sides of the impeller. Figure 4 As shown, the bearing is installed in the centered bearing seat, the bearing operates in a good condition, and the bearing has a long service life. Therefore, the two-end support bearing seat centering tool and method of the present invention can significantly improve the operating reliability of the rotating machinery.

[0062] The above embodiments are only used to help understand the method and core idea of ​​the present invention. It should be noted that, for those skilled in the art, several improvements and modifications can be made to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

[0063] The above description of the disclosed embodiments enables one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A two-end supported bearing seat shaft alignment tool, characterized in that: The centering tool is semi-circular with a groove in the middle, and the groove matches the thickness of the bearing; One side of the groove is a small boss and the other side is a large boss; The height of the large boss is greater than the height of the small boss, The small boss is used to constrain the side position of the bearing outer ring; The large boss is used to constrain the side position of the bearing inner ring.

2. The shaft alignment tool for a bearing seat with two ends supported according to claim 1, characterized in that: A lifting lug is arranged on the side wall of the centering tool.

3. The shaft alignment tool for a bearing seat with two ends supported according to claim 1, characterized in that: The bottom of the lifting ear is a screw which is screwed into the side wall.

4. A method for centering a shaft system of a bearing seat with two ends supported, characterized in that: The following steps are involved: Step 1: Install the bearing support bracket; Step 2: The bearing seat adopts a center-split structure, and the lower half of the bearing seat is loosely connected to the bearing seat bracket; Step 3: Install the two bearings to the shaft diameter positioning positions respectively, and fix them with round nuts and locking washers; Step 4: Fix the inner ring and outer ring of the bearing using the centering tool described in any one of claims 1 to 3; Step 5: Install the bearing back into the lower bearing seat, and continue to apply external force to the bearing seat. The bearing seat is in a dynamic adjustment process until the bearing is completely inserted into the lower bearing seat. Step 6: Tighten the bolts between the lower bearing seat and the bearing seat bracket; Step 7: Remove the alignment tool and connect and secure the upper and lower bearing seats.

5. The method for centering the shaft system of a bearing seat with two ends supported according to claim 4 is characterized in that: The bearing is a spherical roller bearing.

6. The method for centering the shaft system of a bearing seat with two ends supported according to claim 4 is characterized in that: In step 3, after heating the bearings, the bearings are respectively installed at the shaft diameter positioning positions of the rotating shaft; Install the locking washer and pre-tightening round nut at the same time; After the bearing has cooled, tighten the round nut completely and bend the outer stop ear of the stop washer into the round nut groove.

7. The method for centering a shaft system of a bearing seat with two ends supported according to claim 4, characterized in that: The step 7 further includes: adding grease into the bearing and the bearing seat cavity; After adding grease, tighten the fastening bolts on the center face of the bearing seat to connect and fix the upper bearing seat with the lower bearing seat.

8. The method for centering a shaft system of a bearing seat with two ends supported according to claim 4, characterized in that: In step 4, the small boss position of the centering tool is installed on the round nut side, and the large boss position is installed on the shaft diameter side of the rotating shaft.

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