A method of installing a marine diesel generator

Abstract

The present application relates to the technical field of shipbuilding, and discloses a kind of installation method of ship diesel generator, comprising the following steps: installation preparation;Welding pad installation;Adjusting pad arrangement;Flatness measurement adjustment, laser calibration of plane laser emission instrument, plane laser equipment includes plane laser emission instrument and laser receiver, and plane laser emission instrument is Easy-Laser plane laser emission instrument;Four laser measuring points on each welding pad are measured by plane laser equipment;The thickness data of adjusting pad is calculated according to the measurement data of welding pad, and adjusting pad is processed;Adjusting pad installation;Generator is hoisted in place;The present application can adjust the processing data of adjusting pad according to the height difference of the four corners of each welding pad, ensure that the installation surface formed by all adjusting pads meets the design requirements, has high measurement accuracy, improves the installation precision and installation quality of diesel generator, and reduces construction period.

Description

Technical Field

[0001] This invention relates to the field of shipbuilding technology, and in particular to a method for installing a marine diesel generator. Background Technology

[0002] Marine diesel generators are the most important energy conversion equipment in a ship's electrical system, responsible for converting the chemical energy in diesel fuel into electrical energy to provide sufficient power support for the ship. As a primary auxiliary machine in a ship's equipment, the installation quality of the diesel generator will greatly affect the ship's performance and user experience.

[0003] During the conventional installation of diesel generators, a tooling plate is used to measure the height difference of the four corners of the welding pads on the generator base and then generate data to adjust the thickness of the pads. This method is greatly affected by the accuracy of the tooling plate. In addition, since the tooling plate needs to be larger than the generator base, it is difficult to store due to its large size. It is also prone to deformation during storage and use, resulting in poor accuracy. Tooling plates are generally only suitable for a single model of generator, making operation cumbersome and its applicability poor. Summary of the Invention

[0004] The purpose of this invention is to provide an installation method for marine diesel generators, which can adjust the processing data of the adjustment pads according to the height difference of the four corners of each welding pad, ensuring that the installation surface formed by all adjustment pads meets the design requirements, with high measurement accuracy, improving the installation accuracy and quality of diesel generators, and reducing the construction period.

[0005] To achieve the above objectives, the present invention provides a method for installing a marine diesel generator, comprising the following steps:

[0006] Step 1: Installation preparation, welding the generator base onto the hull;

[0007] Step 2: Welding pad installation. Grind and correct the installation position of the welding pad on the generator base, then position and weld the welding pad on the generator base, and mark and drill holes for the welding pad.

[0008] Step 3: Adjust the pads and use the adjusting pads to grind and correct the top surface of the welding pads. Mark each adjusting pad and welding pad, and set four laser measurement points on each welding pad. The four laser measurement points are located at the four corner edges of the adjusting pad.

[0009] Step 4: Adjust the flatness reading.

[0010] Step 4.1, laser calibration of the planar laser emitter: Set the laser measurement point at the very beginning of the first outer edge of the generator base as the first reference point; set the laser measurement point at the very end of the first outer edge of the generator base as the second reference point, with the second reference point and the first reference point arranged horizontally along the generator base; set the laser measurement point at the very end of the second outer edge of the generator base as the third reference point, with the third reference point and the second reference point arranged vertically along the generator base; place the planar laser emitter on the generator base, close to the first reference point; first place the laser receiver at the first reference point, ensuring the laser emitted by the planar laser emitter hits the center of the laser receiver, and then... First, zero the previous value. Then, place the laser receiver at the second reference point and adjust the horizontal laser adjustment knob on the planar laser emitter until the laser receiver reading is zero within ±0.05mm. Next, place the laser receiver at the third reference point and adjust the vertical laser adjustment knob on the planar laser emitter until the laser receiver reading is zero within ±0.05mm. Finally, repeat the above operation until all position data of the first, second, and third reference points are within ±0.05mm. The planar laser device includes a planar laser emitter and a laser receiver. The planar laser emitter is an Easy-Laser planar laser emitter with a laser accuracy of 0.01mm.

[0011] Step 4.2: Measure four laser measurement points on each welding pad using a planar laser device;

[0012] Step 4.3: Calculate the thickness data of the adjusting pad based on the measurement data of the welding pad, and process the adjusting pad;

[0013] Step 4.4, Install the adjusting pads;

[0014] Step 5: Hoist the generator into place and secure it.

[0015] As a preferred embodiment of the present invention, in step 4.4, before installing the adjusting pads, step 4.1 is repeated, and each adjusting pad is placed on the corresponding welding pad. The height of the laser receiver is adjusted so that when the laser receiver is placed on the welding pad, the laser from the planar laser emitter can hit the center of the laser receiver. Then, the data at the four corners of each adjusting pad is measured using a planar laser device. When the deviation between the actual engine mounting surface formed by all adjusting pads and the designed engine mounting surface is ≤0.5mm, the adjusting pads are installed. When the deviation between the actual engine mounting surface formed by all adjusting pads and the designed engine mounting surface is >0.5mm, the adjusting pads that exceed the error range are subjected to secondary processing.

[0016] As a preferred embodiment of the present invention, in step 4.2, when measuring each welding pad, the horizontal laser adjustment knob is first adjusted so that the horizontal value reading of the laser receiver is within ±0.2mm before the data in the vertical direction is recorded.

[0017] As a preferred embodiment of the present invention, in step 4.2, the sum of the absolute values ​​of the elevation differences between two laser measurement points in two diagonal directions on the same welding pad must be ≤0.2m.

[0018] As a preferred embodiment of the present invention, in step 4.2, after completing the laser measurement of all welding pads, the laser receiver is placed at the second reference point, and the deviation between the measurement data and the measurement data of the laser measurement points on the welding pads located at the second reference point is checked. When the deviation value is <0.05mm, the accuracy of the measurement data meets the requirements.

[0019] As a preferred embodiment of the present invention, an EXCEL formula table is used to record the laser measurement point data of the welding pad and to calculate and adjust the thickness data of the pad.

[0020] As a preferred embodiment of the present invention, the bottom of the laser receiver is provided with a measuring base, the measuring base including a magnetic base, a first connecting rod, a base plate and a second connecting rod, the first connecting rod is installed on the magnetic base, the base plate is fixed on the first connecting rod by fixing bolts, the second connecting rod is installed on the base plate, and the bottom of the laser receiver is connected to the second connecting rod.

[0021] As a preferred embodiment of the present invention, in step 5, before the generator is hoisted, the limiting screws of the generator isolator are tightened to the top dead center position, and the pre-compression bolts of the generator isolator are removed; when the generator is hoisted and placed in place, the diagonal position of the generator is positioned by two bolts.

[0022] As a preferred embodiment of the present invention, in step 5, after the generator is hoisted and placed, the generator elastic seat anchor bolts are tightened according to the generator installation design drawing, the height of the limit screw is adjusted so that the height of the limit screw is half of the total clearance value, and the anti-loosening nut is tightened.

[0023] As a preferred embodiment of the present invention, in step 2, a grinding wheel is used to grind and correct the installation position of the welding pad on the generator base, the contact gap between the welding pad and the generator base is ≤0.1mm, and the insertion depth of a 0.1mm feeler gauge is allowed to be no more than 10mm.

[0024] The installation method for a marine diesel generator according to an embodiment of the present invention has the following advantages compared with the prior art:

[0025] This invention uses an Easy-Laser planar laser emitter to measure the flatness of the installed welding pads, achieving high measurement accuracy. Then, based on the height difference of the four corners of each welding pad, the processing data of the adjustment pads is adjusted to ensure that the installation surface formed by all adjustment pads meets the design requirements, thereby improving the installation accuracy and quality of the diesel generator and reducing the construction period. Attached Figure Description

[0026] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings of the embodiments will be briefly described below.

[0027] Figure 1 This is a schematic diagram of the planar laser emitter provided by the present invention during calibration on a generator base;

[0028] Figure 2 A diagram showing the positional relationship between the first reference point, the second reference point, and the third reference point provided for this invention;

[0029] Figure 3 The arrangement diagram of the welding pad and the adjusting pad provided by the present invention;

[0030] Figure 4 This is a schematic diagram of the structure of the measuring base provided by the present invention;

[0031] In the figure, generator base 1; welding pad 2; laser measurement point 21; first reference point 22; second reference point 23; third reference point 24; adjustment pad 3; planar laser emitter 4; horizontal laser adjustment knob 41; vertical laser adjustment knob 42; laser receiver 5; measurement base 6; magnetic base 61; first connecting rod 62; base plate 63; second connecting rod 64; fixing bolt 65. Detailed Implementation

[0032] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0033] In the description of this invention, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0034] like Figures 1 to 4 As shown, a preferred embodiment of the present invention provides a method for installing a marine diesel generator, comprising the following steps:

[0035] Step 1: Installation preparation. Weld the generator base 1 onto the hull. Complete the painting inspection of the generator base 1 and ensure that the large-scale fire work around the generator is completed.

[0036] Step 2: Install welding pad 2. Grind and correct the installation position of welding pad 2 on generator base 1, then position and weld welding pad 2 on generator base 1, and mark and drill holes for welding pad 2.

[0037] Step 3: Adjusting the shims 3 and smoothing the top surface of the welding shims 2 using the adjusting shims 3. Mark each adjusting shim 3 and welding shim 2 for corresponding construction during subsequent processing. Set four laser measuring points 21 on each welding shim 2, with the four laser measuring points 21 located at the four corner edges of the adjusting shim 3 to ensure a high degree of fit between the adjusting shims 3 and the welding shims 2.

[0038] Step 4: Adjust the flatness reading. The measurement should be carried out on a cloudy day or at night, and ensure that all major welding work around the generator base 1 is completed. During the measurement process, avoid strong light shining on the laser, and do not arrange large vibration construction work around the generator base 1 to prevent affecting the measurement accuracy.

[0039] Step 4.1, laser calibration of the planar laser emitter 4: The laser measurement point 21 at the very beginning of the first outer edge of the generator base 1 is set as the first reference point 22; the laser measurement point 21 at the very end of the first outer edge of the generator base 1 is set as the second reference point 23, with the second reference point 23 and the first reference point 22 arranged horizontally along the generator base 1; the laser measurement point 21 at the very end of the second outer edge of the generator base 1 is set as the third reference point 24, with the third reference point 24 and the second reference point 23 arranged vertically along the generator base 1; the planar laser emitter 4 is placed on the generator base 1, close to the first reference point 22; the laser receiver 5 (i.e., the laser receiving target) is first placed at the first reference point 22, so that the laser emitted by the planar laser emitter 4 hits the center of the laser receiver 5, and the current value is zeroed; then the laser receiver 5 is placed at the first reference point 22... At the second reference point 23, adjust the horizontal laser adjustment knob 41 on the planar laser emitter 4 until the laser receiver 5 reading is zero within ±0.05mm. Then, place the laser receiver 5 at the third reference point 24 and adjust the vertical laser adjustment knob 42 on the planar laser emitter 4 until the laser receiver 5 reading is zero within ±0.05mm. Finally, repeat the above operation until all position data of the first reference point 22, the second reference point 23, and the third reference point 24 are within ±0.05mm. The planar laser device includes a planar laser emitter 4 and a laser receiver 5. The planar laser emitter 4 is an Easy-Laser planar laser emitter 4, and its laser accuracy is 0.01mm. This ensures the accuracy and repeatability of the measurement. During measurement, it is advisable to adjust the angle of the laser receiver 5 so that its screen is perpendicular to the laser beam; this can be checked by observing the position of the reflected light spot.

[0040] Step 4.2: Measure the four laser measurement points 21 on each welding pad 2 using a planar laser device, and use the real-time value measurement function to measure the height difference of the four corners of each welding pad 2; this can accurately measure the height difference of the four corners of the welding pad 2.

[0041] Step 4.3: Calculate the thickness data of the adjusting pad 3 based on the measurement data of the welding pad 2, process the adjusting pad 3, and after the processing is completed, mark and drill holes for the adjusting pad 3 according to the drawing.

[0042] Step 4.4, install adjusting pad 3;

[0043] Step 5: Hoist the generator into place and secure it.

[0044] This invention uses an Easy-Laser planar laser emitter 4 to measure the flatness of the installed welding pad 2 with high accuracy. Then, based on the height difference of the four corners of each welding pad 2, the processing data of the adjustment pad 3 is adjusted to ensure that the installation surface formed by all adjustment pads 3 meets the design requirements, thereby improving the installation accuracy and quality of the diesel generator and reducing the construction period.

[0045] For example, in step 4.4, before installing the adjusting pad 3, step 4.1 is repeated, and then each adjusting pad 3 is placed on the corresponding welding pad 2. The height of the laser receiver 5 is adjusted so that when the laser receiver 5 is placed on the welding pad 2, the laser from the planar laser emitter 4 can hit the center of the laser receiver 5. Then, the data at the four corners of each adjusting pad 3 are measured by the planar laser device. When the deviation between the actual mounting surface of the engine formed by all adjusting pads 3 and the designed mounting surface of the engine is ≤0.5mm, the adjusting pad 3 is installed. When the deviation between the actual mounting surface of the engine formed by all adjusting pads 3 and the designed mounting surface of the engine is >0.5mm, the adjusting pads 3 that exceed the error range are processed again to further improve the measurement accuracy.

[0046] Specifically, in step 4.2, when measuring each welding pad 2, the horizontal laser adjustment knob 41 is first adjusted so that the horizontal value reading of the laser receiver 5 is within ±0.2mm before the vertical data is recorded to ensure high measurement accuracy.

[0047] Furthermore, in step 4.2, on the same welding pad 2, the sum of the absolute values ​​of the elevation differences between the two laser measurement points 21 in the two diagonal directions must be ≤0.2m. The calculation is as follows: the absolute value of the elevation difference between the upper left laser measurement point 21 and the lower right laser measurement point 21, the absolute value of the elevation difference between the upper right laser measurement point 21 and the lower left laser measurement point 21, and the sum of the two results; if the deviation exceeds the limit, the data of the welding pad 2 should be remeasured.

[0048] For example, in step 4.2, after completing the laser measurement of all welding pads 2 at the laser measurement points 21, the laser receiver 5 is placed at the second reference point 23 to check the deviation between the measurement data and the measurement data of the laser measurement points 21 on the welding pads 2 located at the second reference point 23. When the deviation value is <0.05mm, the measurement data accuracy meets the requirements, ensuring high measurement accuracy.

[0049] Specifically, an Excel spreadsheet is used to record the laser measurement data of welding pad 2 at point 21 and to calculate the thickness data of adjustment pad 3. An example is shown below:

[0050] The table below shows the height difference measurement data for welding pad 2, labeled NO.6, in an Excel formula table.

[0051]

[0052] The table below shows the initial data for adjustment pad 3 (number 6) in the Excel formula table, which was not averaged.

[0053]

[0054] Where A42 = T3 - A4; C42 = T3 - C4; A44 = T3 - A6; C44 = T3 - C6; A45 = A44 + C42; C45 = A42 + C44; it should be noted that A42 is the value in cell 42 of column A, and the others are similar.

[0055] The value of T3 is the reference height of adjustment pad 3 in the EXCEL table. In this embodiment, the actual value of T3 is 28.

[0056] The table below shows the average data for adjustment pad 3, labeled NO.6, in an Excel formula table.

[0057]

[0058]

[0059] Where, A90=A42-(C45-A45) / 4; C90=C42+(C45-A45) / 4; A92=A44+(C45-A45) / 4; C92=C44-(C45-A45) / 4; A90, C90, A92, and C92 are the thickness data of the four corners of the adjusting pad 3 of block (NO.6). The other adjusting pads 3 are calculated according to the same method, and the reference height of the adjusting pad 3 remains unchanged.

[0060] For example, the bottom of the laser receiver 5 is provided with a measuring base 6. The measuring base 6 includes a magnetic base 61, a first connecting rod 62, a base plate 63, and a second connecting rod 64. The first connecting rod 62 is mounted on the magnetic base 61, and the base plate 63 is fixed to the first connecting rod 62 by fixing bolts 65. The second connecting rod 64 is mounted on the base plate 63. The bottom of the laser receiver 5 is connected to the second connecting rod 64 and is firmly fixed to the laser measuring point 21 by the magnetic base 61 to avoid positional displacement and ensure measurement accuracy.

[0061] For example, in step 5, before hoisting the generator, the limiting screws of the generator isolator are tightened to the top dead center position, and the pre-compression bolts of the generator isolator are removed; when the generator is almost in place, the diagonal positions of the generator are positioned using two bolts. The hoisting process should be smooth. After the generator is hoisted and placed, the generator elastic seat anchor bolts are tightened according to the generator installation design drawing, and then the height of the limiting screws is adjusted so that the height of the limiting screws is half of the total clearance value, and the anti-loosening nuts are tightened.

[0062] Specifically, in step 2, a grinding wheel is used to grind and correct the installation position of the welding pad 2 on the generator base 1. The contact gap between the welding pad 2 and the generator base 1 is ≤0.1mm, and the insertion depth of a 0.1mm feeler gauge is allowed to be no more than 10mm.

[0063] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0064] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and substitutions can be made without departing from the technical principles of the present invention, and these improvements and substitutions should also be considered within the scope of protection of the present invention.

Claims

1. A method for installing a marine diesel generator, characterized in that, Includes the following steps: Step 1: Installation preparation, welding the generator base onto the hull; Step 2: Welding pad installation. Grind and correct the installation position of the welding pad on the generator base, then position and weld the welding pad on the generator base, and mark and drill holes for the welding pad. Step 3: Adjust the pads and use the adjusting pads to grind and correct the top surface of the welding pads. Mark each adjusting pad and welding pad, and set four laser measurement points on each welding pad. The four laser measurement points are located at the four corner edges of the adjusting pad. Step 4: Adjust the flatness reading. Step 4.1, laser calibration of the planar laser emitter, includes steps 4.11 and 4.12: Step 4.11: Set the laser measurement point at the very beginning of the first outer edge of the generator base as the first reference point, set the laser measurement point at the very end of the first outer edge of the generator base as the second reference point, and arrange the second reference point and the first reference point along the horizontal direction of the generator base; set the laser measurement point at the very end of the second outer edge of the generator base as the third reference point, and arrange the third reference point and the second reference point along the vertical direction of the generator base. Step 4.12: Place the planar laser emitter on the generator base, close to the first reference point. First, place the laser receiver at the first reference point, ensuring the laser emitted by the planar laser emitter hits the center of the laser receiver, and zero the current value. Then, place the laser receiver at the second reference point and adjust the horizontal laser adjustment knob on the planar laser emitter until the laser receiver reading is zero within ±0.05mm. Next, place the laser receiver at the third reference point and adjust the vertical laser adjustment knob on the planar laser emitter until the laser receiver reading is zero within ±0.05mm. Finally, repeat step 4.12 until all position data of the first, second, and third reference points are within ±0.05mm. The planar laser device includes a planar laser transmitter and a laser receiver. The planar laser transmitter is an Easy-Laser planar laser transmitter, and the laser accuracy of the planar laser transmitter is 0.01mm. Step 4.2: Measure four laser measurement points on each welding pad using a planar laser device; Step 4.3: Calculate the thickness data of the adjusting pad based on the measurement data of the welding pad, and process the adjusting pad; Step 4.4, Adjustment shim installation; Before installing the adjustment shims, repeat step 4.1, then place each adjustment shim on the corresponding welding shim, and adjust the height of the laser receiver so that when the laser receiver is placed on the welding shim, the laser from the planar laser emitter can hit the center of the laser receiver; then measure the data at the four corners of each adjustment shim using a planar laser device. If the deviation between the actual engine mounting surface and the designed engine mounting surface formed by all adjustment shims is ≤0.5mm, then the adjustment shims are installed; if the deviation between the actual engine mounting surface and the designed engine mounting surface formed by all adjustment shims is >0.5mm, the adjustment shims that exceed the error range are subjected to secondary processing; Step 5: Hoist the generator into place and secure it.

2. The installation method of the marine diesel generator as described in claim 1, characterized in that, In step 4.2, when measuring each welding pad, first adjust the horizontal laser adjustment knob so that the horizontal value reading of the laser receiver is within ±0.2mm, and then record the data in the vertical direction.

3. The installation method of the marine diesel generator as described in claim 2, characterized in that, In step 4.2, the sum of the absolute values ​​of the elevation differences between two laser measurement points in two diagonal directions on the same welding pad must be ≤0.2m.

4. The installation method of the marine diesel generator as described in claim 1, characterized in that, In step 4.2, after completing the laser measurement of all welding pads, the laser receiver is placed at the second reference point, and the deviation between the measurement data and the measurement data of the laser measurement points on the welding pads located at the second reference point is checked. When the deviation value is <0.05mm, the accuracy of the measurement data meets the requirements.

5. The installation method of the marine diesel generator as described in claim 1, characterized in that, The laser measurement point data of the welding pad and the thickness data of the pad were recorded using an EXCEL formula table.

6. The installation method of the marine diesel generator as described in claim 1, characterized in that, The laser receiver has a measuring base at its bottom, which includes a magnetic base, a first connecting rod, a base plate, and a second connecting rod. The first connecting rod is mounted on the magnetic base, the base plate is fixed to the first connecting rod by fixing bolts, the second connecting rod is mounted on the base plate, and the bottom of the laser receiver is connected to the second connecting rod.

7. The installation method of the marine diesel generator as described in claim 1, characterized in that, In step 5, before the generator is hoisted, the limiting screws of the generator isolator are tightened to the top dead center position, and the pre-compression bolts of the generator isolator are removed; when the generator is hoisted and almost in place, the diagonal position of the generator is positioned by two bolts.

8. The installation method of the marine diesel generator as described in claim 1, characterized in that, In step 5, after the generator is hoisted and positioned, the generator elastic seat anchor bolts are tightened according to the generator installation design drawing. Then, the height of the limit screw is adjusted so that the height of the limit screw is half of the total clearance value, and the anti-loosening nut is tightened.

9. The installation method of the marine diesel generator as described in claim 1, characterized in that, In step 2, a grinding wheel is used to grind and correct the installation position of the welding pad on the generator base. The contact gap between the welding pad and the generator base is ≤0.1mm, and the insertion depth of a 0.1mm feeler gauge is allowed to be no more than 10mm.

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