CN112697020A - Method for measuring gap of thrust ball bearing of marine diesel engine - Google Patents
Method for measuring gap of thrust ball bearing of marine diesel engine Download PDFInfo
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- CN112697020A CN112697020A CN202011330788.4A CN202011330788A CN112697020A CN 112697020 A CN112697020 A CN 112697020A CN 202011330788 A CN202011330788 A CN 202011330788A CN 112697020 A CN112697020 A CN 112697020A
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- diesel engine
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- 238000000034 method Methods 0.000 title claims abstract description 32
- 238000005259 measurement Methods 0.000 claims abstract description 12
- 230000008859 change Effects 0.000 claims abstract description 4
- 238000009434 installation Methods 0.000 claims description 14
- 230000008569 process Effects 0.000 abstract description 13
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000691 measurement method Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B5/00—Measuring arrangements characterised by the use of mechanical techniques
- G01B5/14—Measuring arrangements characterised by the use of mechanical techniques for measuring distance or clearance between spaced objects or spaced apertures
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- A Measuring Device Byusing Mechanical Method (AREA)
Abstract
The invention discloses a method for measuring a gap of a thrust ball bearing of a marine diesel engine, which comprises the following steps of: firstly, disassembling two symmetrical crankcase covers close to a flywheel of a diesel engine; secondly, mounting a top support base on one side of the mounting window, which is far away from the flywheel of the diesel engine; fixing the dial indicator on the stern part of the diesel engine by using a magnetic gauge stand; fourthly, mounting the jack at the mounting end of the top support base; fifthly, continuing to lift the jack and observing the reading of the dial indicator; removing the top support base, and mounting the top support base on one side of the mounting window close to the flywheel of the diesel engine; seventhly, mounting a jack at the mounting end of the top support base, jacking the jack, and observing the reading change of the dial indicator; step eight, dismantling the magnetic gauge stand, the dial indicator, the jack and the top support base; and step nine, assembling two symmetrical crankcase covers close to the flywheel of the diesel engine. The method has the advantages of rapid measurement process and high data precision, and avoids measurement errors generated by using a clearance gauge method.
Description
Technical Field
The invention belongs to the technical field of ship construction, and particularly relates to a method for measuring a gap of a thrust ball bearing of a marine diesel engine.
Background
The marine diesel engine drives the propeller blades of the propeller to rotate through the shafting, water is supplied under the action of the circumferential direction and the axial direction, meanwhile, the water generates reaction force on the propeller, and the axial force acting on the propeller acts on the thrust bearing through the stern shaft, the intermediate shaft and the thrust shaft and finally acts on the ship body. For a large-scale low-speed diesel engine, a crankshaft is directly connected with a thrust shaft, a thrust bearing plays roles in transmitting axial thrust and axially positioning, and the large-scale low-speed diesel engine is aligned and installed on a ship by adopting a whole machine hoisting process. Although the technical parameters required by the large-scale low-speed diesel engine complete manufacturer are tested and recorded during the on-site bench test, in the aligning and mounting process of a real ship, in order to avoid the diesel engine from being changed due to external force, some important parameters need to be measured again in the ship building process of a shipyard, so that the building quality of the ship is ensured, and the measurement of the gap of the thrust bearing of the diesel engine is one of the parameters.
The large low-speed diesel engine has high propulsion power and large tonnage, and a crankshaft balance block is also arranged on a crankshaft of the diesel engine so as to improve the crankshaft balance condition and reduce the load of a main bearing and the vibration of the diesel engine. The diesel engine mounting process requires that the rear clearance of a diesel engine thrust bearing close to an output end is not less than 0.1mm in a cold-state mounting state of the diesel engine, and the clearance measurement of the traditional thrust bearing adopts a feeler gauge measurement method, but because the large low-speed diesel engine adopts the whole machine hoisting process, and the thrust bearing is mounted at the position of the output end of the diesel engine close to a diesel engine flywheel, a dynamic balance test is performed during the manufacturing of the diesel engine, if the diesel engine flywheel or a diesel engine body is disassembled for the clearance measurement of the thrust bearing, the process is complex, time and labor are consumed, the balance of the diesel engine and the timing accuracy of the diesel engine flywheel can be damaged seriously, and therefore the clearance measurement of the thrust bearing can not be directly.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for measuring the gap of a thrust ball bearing of a marine diesel engine, which can indirectly measure the gap of the thrust bearing, saves the complex step of disassembling the flywheel of the diesel engine or the seal of the diesel engine body for measuring the gap of the thrust bearing, avoids the damage of the disassembling work on the balance of the diesel engine and the timing accuracy of the flywheel, and has the advantages of time and labor saving, simple process, quick measuring process and high data precision.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a method for measuring a gap of a thrust ball bearing of a marine diesel engine, which comprises the following steps:
firstly, two symmetrical crankcase covers close to a flywheel of a diesel engine are disassembled, an installation window is formed at the disassembled position, and a group of crankshaft balance blocks are exposed out of the position of the installation window;
secondly, mounting a top support base on one side of the mounting window, which is far away from the flywheel of the diesel engine, wherein the mounting end of the top support base is positioned between the two crankshaft balance blocks;
fixing a dial indicator on the stern part of the diesel engine by using a magnetic indicator seat, fixing the magnetic indicator seat on a shell close to a flywheel of the diesel engine, enabling an indicator rod of the dial indicator to be parallel to the central line of the crankshaft, and adjusting an indicator needle to be in contact with the flywheel of the diesel engine;
fourthly, mounting a jack at the mounting end of the top support base, wherein the jack is tightly fixed between the top support base and the crankshaft balance block;
fifthly, continuing to lift the jack and observing the reading of the dial indicator, recording the reading value L1 of the dial indicator when the reading of the dial indicator is not changed any more, and detaching the jack;
removing the top support base, mounting the top support base on one side of the mounting window close to the flywheel of the diesel engine, and positioning the mounting section of the top support base between the two crankshaft balance blocks;
seventhly, mounting the jack at the mounting end of the top support base, jacking the jack, observing the reading change of the dial indicator, recording the reading value L2 of the dial indicator, and stopping jacking the jack when the absolute value of L2-L1 exceeds the theoretical value of the clearance behind the thrust bearing;
step eight, dismantling the magnetic gauge stand, the dial indicator, the jack and the top support base;
and step nine, assembling two symmetrical crankcase covers close to the flywheel of the diesel engine, and finishing measurement.
In the second step, the cross section of the top support base is in a U shape, and the top support base penetrates through a gap between the crankshaft balance weights and is fixed on a corresponding bolt hole on the crankcase through a bolt.
In the third step, after the pointer of the dial indicator is adjusted to contact with the flywheel of the diesel engine, the pointer of the dial indicator is rotated for 1-2 circles, so that the pointer of the dial indicator is in a compressed state, and the reading of the dial indicator is negative.
As a preferable technical scheme, in the fourth step, in the sixth step, a skid is arranged between the jack and the crankshaft balance block.
As a preferable technical scheme, the thickness of the skid is 30 mm.
According to the preferable technical scheme, the thrust bearing comprises a thrust shaft, a thrust collar, a forward thrust block and a reverse thrust block, the thrust collar is fixedly installed on the thrust shaft, the thrust shaft is connected with a crankshaft, the forward thrust block is arranged on one side, away from a flywheel of the diesel engine, of the thrust collar, the reverse thrust block is arranged on one side, close to the flywheel of the diesel engine, of the thrust collar, and a gap between the reverse thrust block and the thrust collar is a rear gap of the thrust bearing.
Preferably, the theoretical value of the back clearance of the thrust bearing is 0.1 mm.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention drives the whole crankshaft to move along the axial direction of the diesel engine through the jacking crankshaft balance block, indirectly measures the gap of the thrust bearing, avoids the damage of the disassembly work on the balance of the diesel engine and the timing accuracy of the flywheel, and has the advantages of time and labor saving, simple process, quick measurement process and high data precision.
(2) The invention avoids disassembling the flywheel of the diesel engine and the complicated step of measuring the gap of the thrust bearing by sealing the diesel engine body, and has the advantages of time saving, labor saving and simple process.
(3) The method has the advantages of quick measurement process, simple method and high data precision, and avoids measurement errors generated by using a clearance gauge method.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic view showing the connection of a crankshaft, a thrust bearing and a flywheel of a diesel engine according to the present invention.
Fig. 2 is a schematic view of the assembly structure of fig. 1 on a diesel engine.
Fig. 3 is a schematic structural view of forward installation of the shoring base.
Fig. 4 is a schematic structural view of the reverse installation of the shoring base.
Wherein the reference numerals are specified as follows: the device comprises a top support base 1, a bolt 2, a crankshaft balance block 3, a jack 4, a skid 5, a magnetic gauge stand 6, a dial indicator 7, a diesel engine flywheel 8 and a thrust bearing 9.
Detailed Description
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.
The embodiment provides a method for measuring a gap of a thrust ball bearing of a marine diesel engine, which comprises the following steps:
firstly, two symmetrical crankcase covers close to a flywheel 8 of the diesel engine are disassembled, an installation window is formed at the disassembled position, and a group of crankshaft balance weights 3 are exposed out of the installation window.
And step two, installing a top support base 1 on one side of the installation window, which is far away from the diesel engine flywheel 8, wherein the installation end of the top support base 1 is positioned between two crankshaft balance blocks 3, the cross section of the top support base 1 is U-shaped, and the top support base 1 penetrates through a gap between the crankshaft balance blocks 3 and is fixed on a corresponding bolt 2 hole on the crankcase through a bolt 2.
And step three, fixing the dial indicator 7 on the stern part of the diesel engine by using the magnetic indicator seat 6, fixing the magnetic indicator seat 6 on a shell close to a flywheel 8 of the diesel engine, enabling an indicator rod of the dial indicator 7 to be parallel to the central line of the crankshaft, and adjusting an indicator needle to be in contact with the flywheel 8 of the diesel engine. After the pointer of the dial indicator 7 is adjusted to be in contact with the flywheel 8 of the diesel engine, the pointer of the dial indicator 7 is rotated for 1-2 circles, so that the pointer of the dial indicator 7 is in a compressed state, and the reading of the dial indicator 7 is negative. Before the dial indicator 7 is installed, the movement condition of the dial indicator 7 needs to be checked, the dial plate moves flexibly and has no clamping stagnation, the magnetic gauge stand 6 is taken out, the magnetic force condition of the magnetic gauge stand 6 needs to be checked well, and the dial indicator 7 is fixed on a shell, close to a flywheel 8 of the diesel engine, of the stern of the diesel engine by using the magnetic gauge stand 6.
Step four, install jack 4 at the installation end of shoring base 1, jack 4 fastens between shoring base 1 and bent axle balancing piece 3, is provided with skid 5 between jack 4 and the bent axle balancing piece 3, and skid 5's thickness is 30mm, and the surface of protection bent axle balancing piece 3 is avoided receiving the friction damage.
And fifthly, continuing to lift the jack 4 and observing the reading of the dial indicator 7, recording the reading value L1 of the dial indicator 7 when the reading of the dial indicator 7 is not changed any more, and detaching the jack 4. The thrust bearing 9 comprises a thrust shaft, a thrust collar, a forward thrust block and a reverse thrust block, the thrust collar is fixedly mounted on the thrust shaft, the thrust shaft is connected with a crankshaft, the forward thrust block is arranged on one side of the thrust collar, which is far away from the diesel engine flywheel 8, the reverse thrust block is arranged on one side of the thrust collar, which is close to the diesel engine flywheel 8, and the gap between the reverse thrust block and the thrust collar is the back gap of the thrust bearing 9. The reading of the dial indicator 7 is not changed any more, which indicates that the thrust ring of the thrust bearing 9 is pressed on the reversing thrust block, and the back clearance of the thrust bearing 9 is zero.
And step six, detaching the jacking base 1, installing the jacking base 1 on one side of the installation window close to the diesel engine flywheel 8, wherein the installation section of the jacking base 1 is positioned between the two crankshaft balance blocks 3, a skid 5 is arranged between the jack 4 and the crankshaft balance blocks 3, and the thickness of the skid 5 is 30 mm.
Seventhly, installing the jack 4 at the installation end of the jacking base 1, jacking the jack 4, observing the reading change of the dial indicator 7, recording the reading value L2 of the dial indicator 7, and stopping jacking the jack 4 when the absolute value of L2-L1 exceeds the theoretical value of the back clearance of the thrust bearing 9. The theoretical value of the back clearance of the thrust bearing 9 is 0.1 mm.
Step eight, dismantling the magnetic gauge stand 6, the dial indicator 7, the jack 4 and the top bracing base 1;
and ninthly, two symmetrical crankcase covers close to the flywheel 8 of the diesel engine are assembled, and the measurement is finished.
Although the present invention has been described in detail with respect to the above embodiments, it will be understood by those skilled in the art that modifications or improvements based on the disclosure of the present invention may be made without departing from the spirit and scope of the invention, and these modifications and improvements are within the spirit and scope of the invention.
Claims (7)
1. A method for measuring a gap of a thrust ball bearing of a marine diesel engine is characterized by comprising the following steps:
firstly, two symmetrical crankcase covers close to a flywheel of a diesel engine are disassembled, an installation window is formed at the disassembled position, and a group of crankshaft balance blocks are exposed out of the position of the installation window;
secondly, mounting a top support base on one side of the mounting window, which is far away from the flywheel of the diesel engine, wherein the mounting end of the top support base is positioned between the two crankshaft balance blocks;
fixing a dial indicator on the stern part of the diesel engine by using a magnetic indicator seat, fixing the magnetic indicator seat on a shell close to a flywheel of the diesel engine, enabling an indicator rod of the dial indicator to be parallel to the central line of the crankshaft, and adjusting an indicator needle to be in contact with the flywheel of the diesel engine;
fourthly, mounting a jack at the mounting end of the top support base, wherein the jack is tightly fixed between the top support base and the crankshaft balance block;
fifthly, continuing to lift the jack and observing the reading of the dial indicator, recording the reading value L1 of the dial indicator when the reading of the dial indicator is not changed any more, and detaching the jack;
removing the top support base, mounting the top support base on one side of the mounting window close to the flywheel of the diesel engine, and positioning the mounting section of the top support base between the two crankshaft balance blocks;
seventhly, mounting the jack at the mounting end of the top support base, jacking the jack, observing the reading change of the dial indicator, recording the reading value L2 of the dial indicator, and stopping jacking the jack when the absolute value of L2-L1 exceeds the theoretical value of the clearance behind the thrust bearing;
step eight, dismantling the magnetic gauge stand, the dial indicator, the jack and the top support base;
and step nine, assembling two symmetrical crankcase covers close to the flywheel of the diesel engine, and finishing measurement.
2. The method for measuring the clearance between the thrust ball bearings of the marine diesel engine according to claim 1, wherein in the second step, the cross section of the top support base is U-shaped, and the top support base penetrates through a gap between the crankshaft balance blocks and is fixed on the corresponding bolt holes on the crankcase through bolts.
3. The method for measuring the gap between the thrust ball bearing of the marine diesel engine according to claim 1, wherein in the third step, after the pointer of the dial indicator is adjusted to be in contact with the flywheel of the diesel engine, the pointer of the dial indicator is rotated for 1-2 circles, so that the pointer of the dial indicator is in a compressed state, and the reading of the dial indicator is negative.
4. The method for measuring the clearance between the thrust ball bearing of the marine diesel engine according to claim 1, wherein in the fourth step, a skid is arranged between the jack and the crankshaft balance block in the sixth step.
5. The method for measuring the gap between the thrust ball bearing of the marine diesel engine according to claim 4, wherein the thickness of the skid is 30 mm.
6. The method for measuring the gap between the thrust ball bearing of the marine diesel engine according to claim 1, wherein the thrust bearing comprises a thrust shaft, a thrust collar, a forward thrust block and a reverse thrust block, the thrust collar is fixedly mounted on the thrust shaft, the thrust shaft is connected with a crankshaft, the forward thrust block is arranged on one side of the thrust collar, which is far away from a flywheel of the diesel engine, the reverse thrust block is arranged on one side of the thrust collar, which is close to the flywheel of the diesel engine, and the gap between the reverse thrust block and the thrust collar is a rear gap of the thrust bearing.
7. The method for measuring the clearance of the thrust ball bearing of the marine diesel engine according to claim 6, wherein the theoretical value of the back clearance of the thrust bearing is 0.1 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011330788.4A CN112697020A (en) | 2020-11-24 | 2020-11-24 | Method for measuring gap of thrust ball bearing of marine diesel engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011330788.4A CN112697020A (en) | 2020-11-24 | 2020-11-24 | Method for measuring gap of thrust ball bearing of marine diesel engine |
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| CN112697020A true CN112697020A (en) | 2021-04-23 |
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| CN202011330788.4A Pending CN112697020A (en) | 2020-11-24 | 2020-11-24 | Method for measuring gap of thrust ball bearing of marine diesel engine |
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Citations (6)
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|---|---|---|---|---|
| JPS5918207A (en) * | 1982-07-21 | 1984-01-30 | Toshiba Corp | Clearance adjusting device of steam turbine |
| CN102506662A (en) * | 2011-10-19 | 2012-06-20 | 常熟理工学院 | Axial gap detecting device of crankshaft |
| CN204985330U (en) * | 2015-07-29 | 2016-01-20 | 中国舰船研究设计中心 | Mechanical type damping thrust bearing |
| CN206509840U (en) * | 2016-12-14 | 2017-09-22 | 内蒙古包钢钢联股份有限公司 | Rotary flying shears roller bearings gap measuring apparatus |
| CN206785872U (en) * | 2016-12-28 | 2017-12-22 | 中船动力研究院有限公司 | A kind of oil supply structure of marine low speed diesel engine thrust bearing lubrication |
| CN110186354A (en) * | 2019-04-19 | 2019-08-30 | 沪东中华造船(集团)有限公司 | A kind of measurement method in shipping rudder system gap |
-
2020
- 2020-11-24 CN CN202011330788.4A patent/CN112697020A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5918207A (en) * | 1982-07-21 | 1984-01-30 | Toshiba Corp | Clearance adjusting device of steam turbine |
| CN102506662A (en) * | 2011-10-19 | 2012-06-20 | 常熟理工学院 | Axial gap detecting device of crankshaft |
| CN204985330U (en) * | 2015-07-29 | 2016-01-20 | 中国舰船研究设计中心 | Mechanical type damping thrust bearing |
| CN206509840U (en) * | 2016-12-14 | 2017-09-22 | 内蒙古包钢钢联股份有限公司 | Rotary flying shears roller bearings gap measuring apparatus |
| CN206785872U (en) * | 2016-12-28 | 2017-12-22 | 中船动力研究院有限公司 | A kind of oil supply structure of marine low speed diesel engine thrust bearing lubrication |
| CN110186354A (en) * | 2019-04-19 | 2019-08-30 | 沪东中华造船(集团)有限公司 | A kind of measurement method in shipping rudder system gap |
Non-Patent Citations (1)
| Title |
|---|
| 张永涛等: "某350MW汽轮机推力间隙测量问题及分析", 《仪器仪表用户》 * |
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Application publication date: 20210423 |
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