A centering tool and centering method for a two-end supported bearing seat

Abstract

This invention relates to the field of nuclear power technology, and particularly to a special tool and method for centering a two-end supported bearing housing. The centering tool is semi-circular with a groove in the middle, the groove matching the thickness of the bearing. One side of the groove has a small boss, and the other side has a large boss. The height of the large boss is greater than the height of the small boss. The small boss is used to restrain the outer ring side of the bearing, and the large boss is used to restrain the inner ring side of the bearing. The centering method is as follows: Install the bearing housing bracket; the bearing housing adopts a split structure, with the lower half of the bearing housing loosely connected to the bearing housing bracket; install the two bearings respectively at the shaft diameter positioning points and fix them with round nuts and locking washers; use the centering tool described above to fix the inner and outer rings of the bearings; reinstall the bearings into the lower half of the bearing housing, continuously applying external force to the bearing housing, which is in a dynamic adjustment process until the bearings are completely seated in the lower half of the bearing housing; tighten the bolts between the lower half of the bearing housing and the bearing housing bracket; remove the centering tool, and connect and fix the upper half of the bearing housing to the lower half of the bearing housing. This invention ensures that the inner and outer rings of the bearing are completely perpendicular to the shaft and remain fixed, facilitating the alignment of the bearings on both sides.

Description

Technical Field

[0001] This invention relates to the field of nuclear power technology, and in particular to a special tool and method for centering a two-end supported bearing housing. Background Technology

[0002] Two-end supported bearing housings are commonly used in rotating machinery such as centrifugal fans and water pumps. Two support bearing housings are installed on opposite sides of the casing, with the impeller positioned between the two support bearings, forming a double-support type. Its advantage lies in relatively balanced motion. However, two-end supported bearing housings currently have the following problems:

[0003] 1. In practical engineering applications, the concentricity of the two-end supported bearing housing cannot be reliably ensured due to the obstruction of the impeller. This leads to abnormal stress on the rolling bearing installed in the bearing housing and aggravated wear and failure, which seriously affects the reliability of the equipment.

[0004] 2. Two-end supported bearing housings are generally paired with self-aligning roller bearings. Because the bearings have self-aligning capabilities, this actually increases the difficulty of aligning the two bearing housings with each other. 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 housing with two-end support, which ensures that the inner and outer rings of the bearing are completely perpendicular to the shaft and remain fixed, facilitating the centering of the bearings on both sides.

[0006] The present invention provides a centering tool for a bearing housing shaft system with two-end support. The centering tool is semi-circular with a groove in the middle, and the groove matches the thickness of the bearing.

[0007] One side of the groove has a small boss, and the other side has 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 restrain the side of the outer ring of the bearing;

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

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

[0012] In one specific embodiment of the present invention, the bottom of the lifting lug is a screw that is screwed into the side wall.

[0013] This invention provides a method for aligning a shaft system with a two-end supported bearing housing, comprising the following steps:

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

[0015] Step 2: The bearing housing adopts a split structure, with the lower half of the bearing housing loosely connected to the bearing housing bracket;

[0016] Step 3: Install the two bearings to the positioning points on the shaft diameter and secure them with round nuts and locking washers;

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

[0018] Step 5: Reinstall the bearing into the lower bearing housing, continuously apply external force to the bearing housing, and the bearing housing is in a dynamic adjustment process until the bearing is completely in the lower bearing housing;

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

[0020] Step 7: Remove the centering tool and connect and fix the upper bearing housing to the lower bearing housing.

[0021] In one specific embodiment of the present invention, the bearing is a self-aligning 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;

[0023] Simultaneously install the locking washer and the preloaded round nut;

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

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

[0026] After adding grease, tighten the bolts on the split face of the bearing housing to connect and fix the upper and lower bearing housings.

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

[0028] Compared with existing technologies, the present invention provides a special tool and method for centering a two-end supported bearing housing. First, the bearing housing brackets on both sides of the impeller are installed, followed by the installation of the bearing housing on the platform of the bearing housing brackets. The bearing housing is not initially tightened to the bearing housing brackets, ensuring that the bearing housing can move freely under external force. After axial positioning of the bearing is completed, the centering tool is installed on the bearings on both sides respectively. At this time, the outer and inner rings of the bearings cannot shift, thus ensuring that the inner and outer rings of the bearings are completely perpendicular to the shaft and remain fixed. The bearings on both sides are slowly lowered into the bearing housing. During the bearing reinstallation process, external force is continuously applied to the bearing housing, which is in a dynamic adjustment process. When the bearings are fully lowered into the bearing housing, the bearing housings on both sides achieve self-adjustment. The anchor bolts of the bearing housing and bearing housing bracket, as well as the centering bolts of the bearing housing, are tightened. Finally, the centering tool, which restricts the bearing's self-aligning ability, is easily disassembled by lifting the annular lifting lug upwards.

[0029] The bearing temperature of the two-end support bearing housing and bearing reinstalled using this alignment tool is about 10°C lower than that of conventional methods, the condition of the bearing grease is also significantly improved, and the blackening of the grease is significantly reduced. Attached Figure Description

[0030] Figure 1 Three-view diagram of a special tool for centering a two-end supported bearing housing provided by the present invention;

[0031] Figure 2 A perspective view of a special tool for centering a two-end supported bearing housing provided by the present invention;

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

[0033] Figure 4 This is a schematic diagram of a rotating machine that uses a two-end supported bearing housing. Detailed Implementation

[0034] To further understand the present invention, embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the present invention.

[0035] An embodiment of the present invention discloses a shaft alignment tool for a two-end supported bearing housing, 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 has a small boss, and the other side has 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 restrain the side of the outer ring of the bearing;

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

[0040] The centering tool is provided with lifting lugs on its side wall.

[0041] The bottom of the lifting lug is a screw that screws into the side wall.

[0042] The alignment tool is used when adjusting and aligning the bearing housings at the drive end and the non-drive end of a rotating machine that has a two-end supported bearing housing during the debugging or disassembly and overhaul of the bearing.

[0043] The centering tool described in this invention is particularly suitable for self-aligning roller bearings.

[0044] An embodiment of the present invention discloses a method for aligning a shaft system with a two-end supported bearing housing, comprising the following steps:

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

[0046] Depending on the structural configuration, if the bearing housing bracket is fixed to the base plate with fastening bolts, the bearing housing bracket must be installed first and the bolts tightened in place. If the bearing housing bracket is welded to the base plate, the bearing housing bracket cannot be adjusted.

[0047] Step 2: The bearing housing adopts a split structure. The lower half of the bearing housing is placed on the bearing housing support platform. The lower half of the bearing housing is loosely connected to the bearing housing support and does not need to be tightened, so that the lower half of the bearing housing can move freely.

[0048] Step 3: Install the two bearings to the positioning points on the shaft diameter and secure them with round nuts and locking washers;

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

[0050] After heating the bearings, install them onto the shaft diameter positioning points.

[0051] Simultaneously install the locking washer and the preloaded round nut;

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

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

[0054] The lifting lug does not protrude from the groove of the centering tool. Hold the lifting lug and secure the centering tool to the upper part of the self-aligning roller bearing. The small boss of the centering tool is installed on the round nut side, and the large boss is installed on the shaft diameter side. Both self-aligning roller bearings on the shaft require the installation of a special tool using the method described above.

[0055] Step 5: Reinstall the bearing into the lower bearing housing. The outer and inner rings of the self-aligning roller bearing cannot shift, thus ensuring that the inner and outer rings of the self-aligning roller bearing are completely perpendicular to the shaft and remain fixed.

[0056] When an external force is continuously applied to the bearing housing, the bearing housing is in a dynamic adjustment process. When the bearing is fully seated in the bearing housing, the bearing housings on both sides have achieved self-adjustment.

[0057] Step 6: Tighten the bolts between the lower bearing housing and the bearing housing bracket, ensuring that the tightening torque value of the bolts meets the requirements;

[0058] Step 7: Easily disassemble the centering tool by lifting the lifting lug upwards.

[0059] Add grease to the cavity between the bearing and the bearing housing;

[0060] After adding grease, tighten the bolts on the split face of the bearing housing to connect and fix the upper and lower bearing housings, ensuring that the torque value of the bolts meets the requirements.

[0061] The above method achieves the self-positioning function of the bearing housing centers on both sides of the impeller. For example... Figure 4 As shown, the bearing is installed in the aligned bearing housing, resulting in good bearing operation and a long service life. Therefore, the two-end supported bearing housing alignment tool and method of the present invention can significantly improve the operational reliability of rotating machinery.

[0062] The above description of the embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

[0063] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those 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 invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method for aligning a shaft system with a two-end supported bearing housing, characterized in that, Includes the following steps: Step 1: Install the bearing housing bracket; Step 2: The bearing housing adopts a split structure, with the lower half of the bearing housing loosely connected to the bearing housing bracket; Step 3: Install the two bearings onto the shaft diameter positioning positions respectively, and secure them with round nuts and locking washers; the bearings are self-aligning roller bearings; after heating the bearings, install them onto the shaft diameter positioning positions respectively; Simultaneously install the locking washer and the preloaded round nut; After the bearing has cooled down, tighten the round nut completely and bend the outer locking lug of the locking washer into the groove of the round nut. Step 4: Use a two-end supported bearing housing shaft alignment tool to fix the inner and outer rings of the bearing; the two-end supported bearing housing shaft alignment tool is semi-circular with a groove in the middle, and the groove matches the thickness of the bearing; One side of the groove has a small boss, and the other side has a large boss; The height of the large boss is greater than the height of the small boss. The small boss is used to restrain the side of the outer ring of the bearing; The large boss is used to restrain the side of the inner ring of the bearing. Step 5: Reinstall the bearing into the lower bearing housing, continuously apply external force to the bearing housing, and the bearing housing is in a dynamic adjustment process until the bearing is completely in the lower bearing housing; Step 6: Tighten the bolts between the lower bearing housing and the bearing housing bracket; Step 7: Remove the centering tool and connect and fix the upper bearing housing to the lower bearing housing.

2. The method for aligning a shaft system with a two-end supported bearing housing according to claim 1, characterized in that, Step 7 further includes: adding grease into the cavity between the bearing and the bearing housing; After adding grease, tighten the bolts on the split face of the bearing housing to connect and fix the upper and lower bearing housings.

3. The method for aligning a shaft system with a two-end supported bearing housing according to claim 1, characterized in that, In step 4, the small boss of the centering tool for the two-end supported bearing housing is installed on the round nut side, and the large boss is installed on the shaft diameter side.

4. The method for aligning a shaft system with a two-end supported bearing housing according to claim 1, characterized in that, The centering tool for the two-end supported bearing housing shaft system is provided with lifting lugs on its side wall.

5. The method for aligning a shaft system with a two-end supported bearing housing according to claim 4, characterized in that, The bottom of the lifting lug is a screw that screws into the side wall.

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