A method for repairing damage to a main bearing bush of a reciprocating compressor

Abstract

The application discloses a kind of reciprocating compressor main bearing bush damage repair method, comprising the following steps: step 1, the concentricity of all main bearing seat of reciprocating compressor main shaft installation position is measured, if there is main bearing seat eccentricity, then execute step 2, if all main bearings are concentric, then execute step 3;Step 2, main bearing seat is repaired, then execute step 3;Step 3, the concentricity of main bearing bush is measured, if there is main bearing bush eccentricity, then execute step 5, if all main bearings are concentric, then repair is completed;Step 4, the main bearing bush measured in step 3 is repaired, the main bearing seat is measured first in the application, whether main bearing has fault is judged, after overhaul, main bearing bush is measured and modified, so that the fault of main bearing seat and main bearing bush can be found and repaired, and the detection accuracy is increased, and the accuracy of repair is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of reciprocating compressor maintenance technology, specifically a method for repairing damaged main shaft bearings of a reciprocating compressor. Background Technology

[0002] The main shaft of single-stage and multi-stage reciprocating compressors is supported by two or more bearing bushes. During current maintenance procedures, there is no way to determine whether damage to the main shaft bearing bushes is due to deformation or misalignment of the bearing bush seat, or a problem with the manufacturing quality of the bearing bushes. Conventional maintenance methods involve hoisting the main shaft into the bearing bushes, checking the contact of each bearing bush with red lead staining, and performing multiple hoisting and repair procedures.

[0003] This inspection method has the following problems: (1) It cannot determine whether the damage to the bearing bush is due to the deformation and misalignment of the bearing seat or the processing quality of the bearing bush; (2) Color inspection relies on experience, and the accuracy of human judgment is not high; (3) The inspection method has a large workload, and repeated hoisting and repair is time-consuming and labor-intensive. Repairing a bearing bush takes 2-3 days. When encountering multiple bearing bush supports, the inspection difficulty and effect are even worse. Summary of the Invention

[0004] The purpose of this invention is to provide a method for repairing damage to the main bearing of a reciprocating compressor, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A method for repairing damaged main bearings of a reciprocating compressor includes a laser instrument 5 for detection and a detection device. The repair method includes the following steps:

[0007] Step 1: Remove the main shaft and main shaft bearings, and measure the concentricity of all main bearing seats at the installation position of the reciprocating compressor main shaft. If any main bearing seats are not concentric, proceed to Step 2. If all main bearings are concentric, proceed to Step 3.

[0008] Step 2: Repair the misaligned main bearing housings measured in Step 1, and then measure the repaired main bearing housings until they are concentric with the rest of the main bearing housings. Then proceed to Step 3.

[0009] Step 3: Install the main bearing shells onto the main bearing housings and measure the concentricity of the main bearing shells. If any main bearing shells are not concentric, proceed to step 5. If all main bearings are concentric, the repair is complete.

[0010] Step 4: Repair the main bearing shells measured in Step 3, and then measure the repaired main bearing shells until the repaired main bearing shells are concentric with the rest of the main bearing shells, then the repair is complete.

[0011] As a further embodiment of the present invention: the detection device includes a fitting part 1 that mates with the inner wall of the main bearing housing and the inner wall of the main bearing bush, the fitting part 1 is detachably connected to a mounting rod 3, and the mounting rod 3 is provided with a detection plate 4.

[0012] As a further aspect of the present invention: the lower end of the mounting rod 3 is provided with an external thread, and the fitting part 1 is provided with a threaded hole for connecting the mounting rod 3.

[0013] As a further aspect of the present invention: the detection plate 4 is provided with a scale 9, the detection plate 4 is slidably connected to the mounting rod 3, and the detection plate 4 is provided with a fixing and locking device for fixing the mounting rod 3.

[0014] As a further embodiment of the present invention: the mounting rod 3 is provided with a rack arranged parallel to the mounting rod 3, the detection plate 4 is provided with a gear that meshes with the rack, and a handle for rotating the gear is provided on one side of the gear.

[0015] As a further aspect of the present invention: the measurement of the main bearing housing in step 1 includes the following steps:

[0016] Step 1.1: Remove the spindle and spindle bearing, and replace the top cover with bolts to restore it to normal condition;

[0017] Step 1.2: Arrange the laser device 5. Place the laser device 5 on one side of the spindle and emit a laser beam. The laser beam is basically coincident with the axis of the spindle bearing housing.

[0018] Step 1.3: Adjust the laser device 5. First, place the detection device in the front main bearing housing 6, then irradiate the front main bearing housing 6 with the laser device 5. Adjust the laser device 5 so that the front main bearing housing 6 and the laser beam of the laser device 5 are concentric. Then, place the detection device in the rear main bearing housing 7, and adjust the rear main bearing housing 7 so that the rear main bearing housing 7 and the laser beam of the laser device 5 are concentric. At this time, the beam coincides with the axis of the front main bearing housing 6 and the rear main bearing housing 7.

[0019] 1.4. Measure the concentricity of the intermediate main bearing housing 8 with the beam. Place the detection device in the intermediate main bearing housing 8, and then irradiate the detection plate 4 with the beam. The detection plate 4 is equipped with a scale 9. If the beam irradiates the center point of the scale 9, then the intermediate main bearing housing 8 is concentric with the front main bearing housing 6 and the rear main bearing housing 7. Otherwise, proceed to step 1.5.

[0020] Step 1.5: The contact part 1 of the rotating detection device allows the detection device to rotate within the inner ring of the main bearing housing, thereby enabling the detection of different positions of the inner ring of the main bearing housing. After detecting at least one position, the detection position is recorded and the offset data of the main bearing housing relative to that position is also recorded. Then, the main bearing housing is repaired based on the detection position and the offset data.

[0021] As a further aspect of the present invention: in step 1.5, the inner ring of the main bearing housing is divided into eight sectors, and the position of the central axis of each sector is measured sequentially to obtain eight offset data. Based on the eight offset data, the position offset data between the current main bearing housing axis and the beam is calculated, and the main bearing housing is repaired based on the offset data.

[0022] As a further aspect of the present invention: the measurement process of the main bearing bush in step 3 is the same as the measurement process of the main bearing seat in step 1.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. This application first measures the main bearing housing to determine if the main bearing is faulty. After repair, the main bearing shell is measured and modified. Therefore, the faults of the main bearing housing and the main bearing shell can be found and repaired in a targeted manner, thereby increasing the detection accuracy and ensuring the accuracy of the repair.

[0025] 2. This application uses a laser instrument in conjunction with a testing device to detect specific shaft offset data, providing accurate data for repair. Moreover, the repair process is simple and the repair cycle is short. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the measurement status in this embodiment;

[0027] Figure 2 This is a schematic diagram of the detection device structure in this embodiment;

[0028] Figure 3 This is a schematic diagram of the detection board structure in this embodiment.

[0029] In the diagram: 1-fitting part, 2-connecting part, 3-mounting rod, 4-detection plate, 5-laser, 6-front main bearing seat, 7-tail main bearing seat, 8-intermediate main bearing seat, 9-scale. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0031] Please see Figure 1-3 In this embodiment of the invention, a method for repairing damage to the main bearing shell of a reciprocating compressor includes a laser instrument 5 and a detection device. The detection device includes a fitting part 1 that mates with the inner wall of the main bearing housing and the inner wall of the main bearing shell. The fitting part 1 is detachably connected to a mounting rod 3. A detection plate 4 is provided on the mounting rod 3. The lower end of the mounting rod 3 is provided with an external thread. The fitting part 1 is provided with a threaded hole for connecting the mounting rod 3. The detection plate 4 is provided with a scale 9. The detection plate 4 is slidably connected to the mounting rod 3, and a fixing locking device is provided on the detection plate 4 for fixing the mounting rod 3. In this embodiment, the mounting rod 3 is provided with a groove, and the detection plate 4 is provided with a slider. The slider is slidably connected in the groove, thereby achieving vertical movement between the detection plate 4 and the mounting rod 3. The purpose of the sliding connection is to provide a rack on the mounting rod 3 and a gear on the detection plate 4 that meshes with the rack. A handle for rotating the gear is located on one side of the gear. The handle can be arranged concentrically or eccentrically with the gear. The gear can be slowly rotated through the handle, thereby fine-tuning the position of the detection plate. The gear meshes with the rack, and as the gear rotates, it drives the detection plate 4 to move up and down on the mounting rod 3. This allows for the selection of different mating parts 1 according to different sizes of main bearing seats or main bearing bushes. At the same time, the up and down adjustment of the detection plate 4 can accommodate different radii, ensuring that the distance between the zero point of the scale 9 on the detection plate 4 and the bottom of the mating part 1 is the same as the radius of the main bearing seat or main bearing bush to be tested.

[0032] The repair method includes the following steps:

[0033] Step 1: Remove the main shaft and main shaft bearings, and measure the concentricity of all main bearing seats at the installation position of the reciprocating compressor main shaft. If any main bearing seats are not concentric, proceed to Step 2. If all main bearings are concentric, proceed to Step 3.

[0034] The measurement of the main bearing housing includes the following steps:

[0035] Step 1.1: Remove the spindle and spindle bearing, and replace the top cover with bolts to restore it to normal condition;

[0036] Step 1.2: Arrange the laser device 5. Place the laser device 5 on one side of the spindle and emit a laser beam. The laser beam is basically coincident with the axis of the spindle bearing housing.

[0037] Step 1.3: Adjust the laser device 5. First, place the detection device in the front main bearing housing 6, then irradiate the front main bearing housing 6 with the laser device 5. Adjust the laser device 5 so that the front main bearing housing 6 and the laser beam of the laser device 5 are concentric. Then, place the detection device in the rear main bearing housing 7, and adjust the rear main bearing housing 7 so that the rear main bearing housing 7 and the laser beam of the laser device 5 are concentric. At this time, the beam coincides with the axis of the front main bearing housing 6 and the rear main bearing housing 7.

[0038] 1.4. Measure the concentricity of the intermediate main bearing housing 8 with the beam. Place the detection device in the intermediate main bearing housing 8, and then irradiate the detection plate 4 with the beam. The detection plate 4 is equipped with a scale 9. If the beam irradiates the center point of the scale 9, then the intermediate main bearing housing 8 is concentric with the front main bearing housing 6 and the rear main bearing housing 7. Otherwise, proceed to step 1.5.

[0039] Step 1.5: The contact part 1 of the rotating detection device allows the detection device to rotate within the inner ring of the main bearing housing, thereby enabling the detection of different positions of the inner ring of the main bearing housing. After detecting at least one position, the detection position is recorded and the offset data of the main bearing housing relative to that position is recorded. Then, the main bearing housing is repaired based on the detection position and the offset data.

[0040] In this embodiment, in step 1.5, the inner ring of the main bearing housing is divided into eight sectors, and the position of the central axis of each sector is measured sequentially to obtain eight offset data. Based on the eight offset data, the position offset data between the current main bearing housing axis and the beam is calculated, and the main bearing housing is repaired based on the offset data.

[0041] Step 2: Repair the misaligned main bearing housings measured in Step 1, and then measure the repaired main bearing housings until they are concentric with the rest of the main bearing housings. Then proceed to Step 3.

[0042] Step 3: Install the main bearing shells onto the main bearing housings and measure the concentricity of the main bearing shells. The measurement process for the main bearing shells is the same as that for the main bearing housings in Step 1. If any main bearing shells are not concentric, proceed to Step 5. If all main bearings are concentric, the repair is complete.

[0043] Step 4: Repair the main bearing shells measured in Step 3, and then measure the repaired main bearing shells until the repaired main bearing shells are concentric with the rest of the main bearing shells, then the repair is complete.

[0044] Example 1

[0045] This embodiment was applied during the overhaul of a 6M32-26.6 / 54.7-67-BX reciprocating compressor unit. This compressor is a 6-cylinder, 3-stage reciprocating compressor with 6 sets of main bearings, numbered 1-6 from the drive end. During each compressor overhaul, it was found that the Babbitt alloy on the main bearings was detaching. This embodiment uses a laser instrument, along with a testing device, to measure concentricity, accurately determining the cause of the bearing damage. The measurement data provides support for bearing repair. The specific operation is as follows:

[0046] Measure the concentricity of the main bearing housing, clean the main bearing housing, reset the top cover, tighten the bolts to the working torque, set up the transmitter at one end of the bearing housing hole to emit a laser beam, then adjust bearing housings 1 and 6 so that bearing housings 1 and 6 are coaxial and the laser beam passes through the axis of bearing housings 1 and 6. Then place the detection device in bearing housing 1 and adjust the position of the detection plate 4 on the mounting rod 3 until the laser beam basically irradiates the center of the dial 9.

[0047] Place the testing device inside bearing housing No. 2 and turn on the laser. The laser emits a laser beam that shines onto the dial. Then, read and record the horizontal and vertical readings of the points on the dial.

[0048] Measure the remaining bearing housings (No. 3, No. 4, and No. 5) in sequence and record the data. The specific data is shown in the table below.

[0049] Table 1

[0050] No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 V / mm 0 0.052 0.058 0.054 0.050 0 H / mm 0 0.053 0.060 0.056 0.060 0

[0051] After the bearing housing inspection is completed, the bearing bush is reinstalled on the bearing housing, and the above steps are repeated. The inspection data of the bearing bush is recorded. The specific data is shown in the table below:

[0052] Table 2

[0053] No. 1 No. 2 No. 3 No. 4 No. 5 No. 6 V / mm 0 0.052 0.122 0.087 0.044 0 H / mm 0 0.053 0.060 0.159 0.068 0

[0054] First, the test data of the bearing housings were analyzed. Table 1 shows that the horizontal and vertical offsets of the bearing housings are consistent. This indicates that during the measurement process, the testing plate 4 was not perfectly concentric with the bearing housings. However, the horizontal and vertical offsets of all bearing housings were the same, and the offset data were all within the error range. Therefore, it can be determined that the bearing housings are not faulty.

[0055] Then, the data of the bearing bushes are analyzed. The height reading of the bearing bush of bearing seat No. 3 is 0.122mm. After deducting the error of detection plate 4, the height deviation is about 0.06mm. It can be seen that there is a deviation in the upper bearing bush of bearing seat No. 3. At the same time, the horizontal reading of the bearing bush of bearing seat No. 4 is 0.159mm. Similarly, after deducting the error caused by the position deviation of detection plate 4, the horizontal deviation of bearing bush No. 4 is about 0.07mm. Therefore, it can be determined that bearing bushes No. 3 and No. 4 are faulty and need to be replaced or repaired. In this embodiment, bearing bushes No. 3 and No. 4 are ground to obtain an eccentric bearing bush that can eliminate the deviation. Then, the repaired bearing bush is installed and assembled with the reciprocating compressor to complete the detection and repair of the reciprocating compressor.

[0056] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the present invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0057] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A method for repairing damaged main bearings of a reciprocating compressor, comprising a laser instrument (5) for detection and a detection device, characterized in that, The repair method includes the following steps: Step 1: Remove the main shaft and main shaft bearings, and measure the concentricity of all main bearing seats at the installation position of the reciprocating compressor main shaft. If any main bearing seats are not concentric, proceed to Step 2. If all main bearings are concentric, proceed to Step 3. Step 2: Repair the misaligned main bearing housings measured in Step 1, and then measure the repaired main bearing housings until they are concentric with the rest of the main bearing housings. Then proceed to Step 3. Step 3: Install the main bearing shells onto the main bearing housings and measure the concentricity of the main bearing shells. If any main bearing shells are not concentric, proceed to step 5. If all main bearings are concentric, the repair is complete. Step 4: Repair the main bearing shells measured in Step 3, and then measure the repaired main bearing shells until the repaired main bearing shells are concentric with the rest of the main bearing shells, then the repair is complete.

2. The method for repairing damaged main shaft bearings of a reciprocating compressor according to claim 1, characterized in that, The detection device includes a fitting part (1) that mates with the inner wall of the main bearing housing and the inner wall of the main bearing bush. The fitting part (1) is detachably connected to a mounting rod (3), and a detection plate (4) is provided on the mounting rod (3).

3. The method for repairing damaged main shaft bearings of a reciprocating compressor according to claim 2, characterized in that, The lower end of the mounting rod (3) is provided with an external thread, and the fitting part (1) is provided with a threaded hole for connecting the mounting rod (3).

4. The method for repairing damaged main shaft bearings of a reciprocating compressor according to claim 2, characterized in that, The detection plate (4) is provided with a scale (9), the detection plate (4) is slidably connected to the mounting rod (3) and the detection plate (4) is provided with a fixing and locking device for fixing the mounting rod (3).

5. A method for repairing damaged main shaft bearings of a reciprocating compressor according to claim 4, characterized in that, The mounting rod (3) is provided with a rack arranged parallel to the mounting rod (3), and the detection plate (4) is provided with a gear that meshes with the rack. A handle for rotating the gear is fixedly connected to one side of the gear.

6. The method for repairing damaged main shaft bearings of a reciprocating compressor according to claim 1, characterized in that, The measurement of the main bearing housing in step 1 includes the following steps: Step 1.1: Remove the spindle and spindle bearing, and replace the top cover with bolts to restore it to normal condition; Step 1.2: Arrange the laser device (5), place the laser device (5) on one side of the spindle and emit a laser beam, the laser beam basically coincides with the axis of the spindle bearing seat; Step 1.3: Adjust the laser (5), then irradiate the front main bearing housing (6) with the laser (5), adjust the laser (5) so that the front main bearing housing (6) and the laser beam (5) are concentric, then place the detection device in the tail main bearing housing (7), adjust the tail main bearing housing (7) so that the tail main bearing housing (7) and the laser beam (5) are concentric, at this time the beam coincides with the axis of the front main bearing housing (6) and the rear main bearing housing (7); Arrangement 1.4: Measure the concentricity of the intermediate main bearing housing (8) with the beam. Place the detection device in the intermediate main bearing housing (8) and then irradiate the detection plate (4). The detection plate (4) is equipped with a scale (9). If the beam irradiates the center point of the scale (9), then the intermediate main bearing housing (8) is concentric with the front main bearing housing (6) and the rear main bearing housing (7). Otherwise, proceed to step 1.

5. Step 1.5: The fitting part (1) of the rotating detection device allows the detection device to rotate within the inner ring of the main bearing housing, thereby enabling the detection of different positions of the inner ring of the main bearing housing. After detecting at least one position, the detection position is recorded and the offset data of the main bearing housing relative to that position is recorded. Then, the main bearing housing is repaired based on the detection position and the offset data.

7. A method for repairing damaged main shaft bearings of a reciprocating compressor according to claim 6, characterized in that, In step 1.5, the inner ring of the main bearing housing is divided into eight sectors. The position of the central axis of each sector is measured sequentially to obtain eight offset data. Based on the eight offset data, the position offset data between the current main bearing housing axis and the beam is calculated, and the main bearing housing is repaired based on the offset data.

8. A method for repairing damaged main shaft bearings of a reciprocating compressor according to claim 1, characterized in that, The measurement process of the main bearing bush in step 3 is the same as the measurement process of the main bearing seat in step 1.

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