Positioning and calibration device and method for segmented engine base of marine diesel engine

Abstract

A positioning and calibration device and method for a segmented engine base of a marine diesel engine, comprising an iron pier, a cushion block of equal height, a positioning assembly and a tightening assembly. The segmented engine base is placed on the iron pier and the cushion block of equal height on a machine tool work surface. The positioning assembly is fixed on one side of the iron pier and quickly positions the segmented engine base. If there is no positioning deviation, the tightening assembly is installed on the other side and tightened; if there is a positioning deviation, one positioning assembly can be removed and replaced with a tightening assembly, and the tightening assembly is installed on the other side and tightened after calibration. The present invention reduces labor intensity, improves the working environment, ensures the processing accuracy of the engine base of a marine diesel engine, improves production efficiency, has the advantages of strong versatility, simple structure, and convenient operation, and can be applied to the positioning, calibration and processing of engine bases of various types of diesel engines.

Description

Technical Field

[0001] The invention relates to the processing of large-scale low-speed marine diesel engine parts, in particular to a positioning and calibration device and method for a segmented engine base of a marine diesel engine, belonging to the technical field of diesel engine manufacturing and processing. Background Art

[0002] The engine base is an important part of large low-speed marine diesel engines and is usually processed by large gantry milling machines. Due to the complex shape, large size, and heavy weight of the engine base of ultra-large low-speed marine diesel engines, in order to ensure accuracy during welding, it is generally welded in two sections. This is the case for 12X92, 12S90, 8G95 and other models; Take 12X92 as an example, please refer to Figure 1 The diesel engine base 5 is formed by connecting the front base 5.1 and the rear base 5.2. The front base 5.1 is 10.23 meters long and weighs 122.83 tons. The rear base 5.2 is 12.27 meters long and weighs 156.8 tons. In order to meet the requirements of the final assembly, the diesel engine base 5 needs to be processed as a whole. Before the processing of the whole, the base bottom plane 5.3 and the base side 5.4 of the diesel engine base 5 have been finely processed, which brings great difficulties to the positioning and calibration of the two bases.

[0003] See also Figure 2 , affected by the shape, the diesel engine base 5 can only be placed on the iron pier 1 and the standard equal height pad 2 (the height is about 1 meter greater than the height of the oil pan) for processing. At present, each time the diesel engine base 5 is processed on the machine, it is necessary to use a crane to lift the half-section of the base to the equal height pad 2 of the iron pier 1 on the machine tool work surface according to the operator's experience, and randomly lay it flat and straight; then use the crane to lift the other half of the base, and the fitter will knock out the guide pins on both sides according to experience, and then replace them with tight matching pins. After the connection is completed, the machine tool will be adjusted as a whole. Since there is no positioning and adjustment device on the machine tool work surface, it brings difficulties to the subsequent adjustment and correction work. To adjust the base weighing hundreds of tons, multiple mechanical jacks 6 are needed, and due to the shape of the diesel engine base 5, the position of placing the mechanical jack 6 can only be near the oil pan, and it is tilted upward when used. Force, which makes the adjustment work more time-consuming and laborious, so a specific positioning and adjustment device must be used. Summary of the invention

[0004] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a positioning and calibration device and method for a segmented engine base of a marine diesel engine, which can correctly position the segmented engine base when processing the diesel engine base on a large gantry milling machine, facilitate the rapid connection and subsequent calibration of the other half of the engine base, thereby achieving the effect of reducing labor intensity, improving the working environment, ensuring processing accuracy and improving production efficiency.

[0005] The technical solution of the present invention is:

[0006] A positioning and calibration device for a segmented engine base of a marine diesel engine, installed on a machine tool work surface, comprises a plurality of iron piers and equal-height pads arranged and supported under the segmented engine base in sequence from bottom to top, the plurality of iron piers are divided into two rows and fixed on both sides of the machine tool work surface, the segmented engine base comprises a front segment engine base and a rear segment engine base connected to form a diesel engine base, and has a finely machined engine base bottom plane and engine base side edges, characterized in that: the positioning and calibration device also comprises:

[0007] A positioning assembly, arranged on an iron pier on one side of the machine tool work surface, for positioning the segmented machine base;

[0008] The tightening assembly is arranged on the iron pier of the other side row of the machine tool working table surface, and is used for adjusting the straightness of the segmented machine base and limiting its displacement.

[0009] Furthermore, the positioning assembly includes a positioning backer body, a positioning backer positioning key and a contour pad; the positioning backer positioning key is fixed to the bottom of the positioning backer body and is positioned on the top of the iron pier through a T-slot, a fixing groove is provided at the lower part of the positioning backer body, and the positioning backer body is fixed to the iron pier through T-bolts and nuts, and the contour pad is fixedly connected to the front part of the positioning backer body and is tightly attached to one side of the segmented machine base to position it.

[0010] Furthermore, the positioning requirements of segmented machine bases of various machine models can be met by adjusting the thickness of the equal-height pads.

[0011] Furthermore, the tightening assembly includes a tightening backrest body, a tightening bolt, a tightening backrest positioning key and a tightening pad; the tightening backrest positioning key is fixed to the bottom of the tightening backrest body and is positioned at the top of the iron pier through a T-slot, and at the same time, the tightening assembly is fixed to the top of the iron pier through a T-bolt and a nut, and the tightening bolt is horizontally screwed to the upper part of the tightening backrest body, and the tightening pad is connected to the front end of the tightening bolt and is close to the other side of the segmented machine base to protect the side of the machine base from being pulled, and the tightening bolt is rotated and the segmented machine base is pushed through the tightening pad, so as to adjust the straightness of the segmented machine base.

[0012] Furthermore, the iron pier is a square box-type component, with a plurality of T-shaped grooves on the top surface for fixing the positioning assembly and the clamping assembly, and a plurality of positioning grooves and U-shaped grooves on the bottom surface. A positioning key is embedded in the positioning groove, and the positioning key is also embedded in the positioning groove of the machine tool work surface to position the iron pier on the machine tool work surface, and the iron pier is connected and fixed to the machine tool work surface through the U-shaped groove.

[0013] Furthermore, a concave surface is provided on the bottom surface of the iron pier to reduce the contact area and avoid inclusion of dust.

[0014] Furthermore, the sum of the height of the iron pier and the height of the equal-height cushion block is greater than the height of the oil pan of the diesel engine base to avoid interference.

[0015] Another technical solution of the present invention is:

[0016] A positioning and adjustment method for a segmented engine base of a marine diesel engine implemented by using the above positioning and adjustment device comprises:

[0017] 1. Install the positioning and adjustment device:

[0018] Two rows of iron piers are placed on both sides of the machine tool worktable to ensure that the connection between the front section machine base and the rear section machine base is located on the same iron pier after installation, and the iron pier is positioned on the machine tool worktable and fixed by the positioning key; a plurality of equal-height pads of the same height are evenly placed on the top surface of the iron pier according to the width of the bottom plane of the machine base, and the height of the equal-height pads is adjusted by measuring and padding copper sheets to ensure that the upper planes of all equal-height pads are on the same horizontal plane, and then the positioning assembly is installed on the iron piers of one side row, and the support backing body and the support backing positioning key of the tightening assembly are placed and fixed on the iron piers of the other side row;

[0019] 2. Position and install the front section base:

[0020] Lift the front machine base, slowly approach it until it is completely close to the equal height pad of the positioning assembly, then slowly lower the front machine base until it is stably placed on the equal height pad, measure whether the side of the machine base is in a straight line with the axis of the machine tool, if there is no deviation, install the tightening bolts and the tightening pads on the tightening backing body of the tightening assembly, and rotate the tightening bolts to tighten the other side of the front machine base through the tightening pad; if there is a deviation in straightness, replace the positioning assembly on the side that needs to be adjusted with the tightening assembly, and after adjusting the straight lines of the front machine base to have no deviation, tighten and fix the front machine base;

[0021] 3. Position and install the rear section base:

[0022] Lift the rear section machine base and slowly bring it close to the front section machine base, stop when they are 1-2 meters apart, then slowly lower the rear section machine base until it is 10-20mm away from the equal height pad, move the machine tool worktable to make the front section machine base slowly approach the rear section machine base until the connecting surfaces are in contact; then slowly make the side of the rear section machine base close to the equal height pad of the positioning assembly, and after it is completely close, slowly lower the rear section machine base and place it steadily on the equal height pad, check and use the tightening assembly to support and adjust the top until the deviation of the connecting pin hole is eliminated, and then connect the front section machine base with the rear section machine base through the tightening pin and connecting bolts, and then remeasure the straightness of the side of the front section machine base and the rear section machine base, and after confirmation, tighten the tightening assembly on the other side to complete the positioning and adjustment of the segmented machine base.

[0023] Furthermore, in the step 1, the height of the equal-height pads is adjusted to ensure that the height deviation is within 0.05 mm.

[0024] Compared with the prior art, the present invention has the following advantages:

[0025] 1) The present invention makes full use of the positioning grooves on the machine tool work surface and the positioning function of the positioning assembly on the iron pier, so that the segmented machine base can be quickly positioned. After positioning, the straightness of the machine base is ensured by further fine-tuning the support assembly. At the same time, the positioning assembly and the support assembly also play a certain clamping role, which improves the stability of the segmented machine base clamping and facilitates subsequent processing.

[0026] 2) The tightening assembly replaces the jack to adjust the straightness of the machine base, which greatly reduces the labor intensity.

[0027] 3) The present invention is also applicable to the positioning, adjustment and processing of machine bases of other different machine types on a gantry milling machine.

[0028] 4) The positioning assembly and the supporting assembly are easy to assemble and disassemble, and do not affect subsequent processing procedures.

[0029] In short, the present invention reduces labor intensity, improves product quality, and improves production efficiency, and has the advantages of quick operation, safe use, and strong practicality. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of a diesel engine base.

[0031] Figure 2 This is a schematic diagram of conventional on-board calibration.

[0032] Figure 3 It is a structural schematic diagram of the positioning and adjusting device of the present invention.

[0033] Figure 4It is a schematic diagram of the layout of the positioning and adjustment device.

[0034] Figure 5 It is a schematic diagram of the structure of the side-mounted iron pier.

[0035] Figure 6 It is one of the structural diagrams of the positioning component.

[0036] Figure 7 This is the second structural diagram of the positioning component.

[0037] Figure 8 It is one of the structural schematic diagrams of the tightening assembly.

[0038] Fig. 9 This is the second structural diagram of the tightening component.

[0039] Fig.10 This is one of the schematic diagrams for positioning and adjusting the segmented machine base.

[0040] Fig.11 This is the second schematic diagram of the positioning and adjustment of the segmented machine base.

[0041] In the figure:

[0042] 1—iron pier, 1.1—positioning key, 1.2—positioning slot, 1.3—U-shaped slot, 1.4—concave surface, 1.5—T-shaped slot, 2—equal height pad, 3—tightening assembly, 3.1—tightening backing body, 3.2—tightening bolt, 3.3—tightening backing positioning key, 3.4—tightening pad, 4—positioning assembly, 4.1—positioning backing body, 4.2—positioning backing positioning key, 4.3—fixing slot, 4.4—equal height pad, 5—diesel engine base, 5.1—front section base, 5.2—rear section base, 5.3—base bottom plane, 5.4—base side, 6—mechanical jack. DETAILED DESCRIPTION

[0043] The positioning and adjustment device and method for a sectional engine base of a marine diesel engine according to the present invention will be further described in detail below in conjunction with the accompanying drawings and specific examples.

[0044] The present invention is used for positioning, calibrating and processing the segmented engine base of a marine diesel engine. The segmented engine base comprises a front engine base 5.1 and a rear engine base 5.2, wherein the front engine base 5.1 and the rear engine base 5.2 are connected to form a diesel engine base 5, and have a finely processed engine base bottom plane 5.3 and an engine base side edge 5.4. Figure 1 .

[0045] Please refer to Figure 3 and Figure 4 The positioning and adjusting device includes a plurality of iron piers 1, a plurality of equal-height pads 2, a positioning component 4 and a tightening component 3.

[0046] The iron pier 1 is installed on the machine tool work surface, and the machine tool work surface is provided with a positioning groove for positioning the iron pier 1. A plurality of iron piers 1 are divided into two rows and fixed on both sides of the machine tool work surface, and are used to place equal height pads 2, positioning components 4 and tightening components 3. Figure 5 The iron pier 1 is a square box-shaped component, and a plurality of positioning grooves 1.2 and U-shaped grooves 1.3 are provided on the bottom surface. A positioning key 1.1 is embedded in the positioning groove 1.2, and the positioning key 1.1 is also embedded in the positioning groove of the machine tool work surface, so as to position the iron pier 1 on the machine tool work surface; by installing the positioning key 1.1 into different positioning grooves 1.2, the positioning needs of the engine base 5 of different types of diesel engines can be met. In order to ensure that the iron pier 1 can fit tightly with the machine tool work surface, a 1mm deep concave surface 1.4 is specially processed on the bottom surface of the iron pier 1 to reduce the contact area and reduce the possibility of garbage being mixed between the machine tool work surface and the iron pier 1. The U-shaped groove 1.3 is connected and fixed to the machine tool work surface by T-bolts, so that the iron pier 1 is installed and fixed on the machine tool work surface. A plurality of T-shaped grooves 1.5 are provided on the top surface of the iron pier 1 for fixing the positioning assembly 4, the tightening assembly 3 and the screw pressure plate for fixing the diesel engine base 5.

[0047] The contour pads 2 are fixed on the iron pier 1 to support the diesel engine base 5. A plurality of contour pads 2 are placed on each iron pier 1. The contour pads 2 are standard contour pads with the same height. The sum of the height of the iron pier 1 and the height of the contour pads 2 is greater than the height of the oil pan of the diesel engine base 5 by about 1 meter, so as to ensure that the oil pan of the diesel engine base 5 does not interfere with the work surface of the machine tool after the diesel engine base 5 is clamped.

[0048] The positioning assembly 4 is mounted on the iron pier 1 on one side of the machine tool work surface, and is used to be close to one side of the diesel engine base 5 to position the diesel engine base 5. Figure 6 and Figure 7 The positioning assembly 4 includes a positioning support body 4.1, a positioning support positioning key 4.2, a fixing groove 4.3 and a contour pad 4.4. The positioning support positioning key 4.2 is fixed to the bottom of the positioning support body 4.1 by bolts, and is positioned on the top of the iron pier 1 through the T-slot 1.5. The fixing groove 4.3 is arranged at the lower part of the positioning support body 4.1, and the positioning support body 4.1 is fixed to the iron pier 1 by installing T-bolts and nuts in the fixing groove 4.3. The contour pad 4.4 is fixedly connected to the front part of the positioning support body 4.1, and is tightly attached to one side of the diesel engine base 5 to position it; by adjusting the thickness of the contour pad 4.4, the positioning requirements of various models can be met.

[0049] The support assembly 3 is installed on the iron pier 1 on the other side of the machine tool work surface, and is used to support one side of the diesel engine base 5 to adjust the straightness of the diesel engine base 5 and limit its displacement. Figure 8 and Fig. 9 The support assembly 3 includes a support body 3.1, a support bolt 3.2, a support positioning key 3.3 and a support pad 3.4. The support positioning key 3.3 is fixed to the bottom of the support body 3.1 and is positioned at the top of the iron pier 1 by being embedded in the T-slot 1.5; at the same time, the support assembly 3 is fixed to the top of the iron pier 1 through the T-bolt and nut and the U-slot at the bottom of the support body 3.1. The support bolt 3.2 is horizontally connected to the upper part of the support body 3.1; the support pad 3.4 is connected to the front end of the support bolt 3.2 and is close to the other side of the diesel engine base 5 to protect the base side 5.4 on the diesel engine base 5 from being pulled. The support bolt 3.2 is rotated to push the diesel engine base 5 through the support pad 3.4, so as to adjust the straightness of the diesel engine base 5.

[0050] The positioning and adjustment method for the segmented engine base of a marine diesel engine described in the present invention is as follows. Fig.10 and Fig.11 :

[0051] First, the base bottom plane 5.3 and base side 5.4 of the front base 5.1 and the rear base 5.2 need to be finished. According to the total length and width of the diesel engine base 5, two rows of iron piers 1 are placed on both sides of the machine tool work surface. Figure 4 , ensure that there is no inclusion in the contact surface between the iron pier 1 and the machine tool worktable, and at the same time ensure that the connection between the front section machine base 5.1 and the rear section machine base 5.2 is located on the same iron pier 1 after installation; install the positioning key 1.1 into the positioning groove 1.2 corresponding to the diesel engine base 5, and embed it into the corresponding positioning groove of the machine tool worktable, and then fix the iron pier 1 on the machine tool worktable by T-bolts and nuts; according to the width of the bottom plane 5.3 of the base, evenly place 100mm high pads 2 on the top surface of the iron pier 1, and then measure and adjust the position with a pull table to ensure that the upper planes of all high pads 2 are on the same horizontal plane. If there is a deviation, adjust it by placing copper foil to ensure that the height deviation is within 0.05MM; then install the positioning assembly 4 on the iron pier 1 on one side according to the length and width of the diesel engine base 5, and place and fix the supporting backing body 3.1 and the supporting backing positioning key 3.3 of the tightening assembly 3 on the iron pier 1 on the other side.

[0052] Secondly, lift the front machine base 5.1 by the crane and slowly move it close to the equal height pad 2. When it is about 20mm away from the equal height pad 2, stop lowering and slowly move the side edge 5.4 of the machine base close to the equal height pad 4.4 of the positioning assembly 4. When it is completely close, slowly lower the front machine base 5.1 and place it stably on the equal height pad 2. Fig.10 ; Remove all wire ropes and shackles, use a dial indicator to pull the measuring machine base side 5.4, re-measure the machine tool straight line. If it is correct, install the support bolts 3.2 and support pads 3.4 on the support backing body 3.1 of the support assembly 3, see Fig.11 , and rotate the tightening bolts 3.2 to tighten the front machine base 5.1; if there is a deviation in straightness, replace the positioning component 4 on one side of the front machine base 5.1 that needs to be adjusted with the tightening component 3, and adjust the straight direction of the front machine base 5.1 by rotating the tightening bolts 3.2. After completion, use the two tightening components 3 on the other side to tighten the front machine base 5.1.

[0053] Finally, the crane lifts the rear machine base 5.2 and slowly moves it close to the front machine base 5.1. When the distance is about 1-2 meters (about 1.5 meters), stop approaching, and slowly lower the rear machine base 5.2 until it is about 10-20mm away from the equal height pad 2; shake the machine tool worktable to make the front machine base 5.1 slowly approach the rear machine base 5.2 until the connection surfaces are in contact; then move the crane to make the machine base side 5.4 of the rear machine base 5.2 slowly approach the equal height pad 4.4 of the positioning assembly 4, and then slowly lower the rear machine base 5.2 after it is completely close to it, so that it can be stably placed on the equal height pad 2; the fitter checks whether the inner hole of the connecting pin hole is If there is a deviation, use the support assembly 3 to support and adjust the corresponding side until the deviation is eliminated; if there is no deviation, directly connect the front base 5.1 and the rear base 5.2 by cross-knocking the tightening pins and pump tightening bolts; after connecting the front base 5.1 and the rear base 5.2, use a dial indicator to re-measure the straightness of the base side 5.4 of the front base 5.1 and the rear base 5.2, and after confirming that there is no error, tighten the support assembly 3 on the other side to complete the positioning and adjustment of the segmented base; finally, fix the front base 5.1 and the rear base 5.2 by the bolt pressure plate, and then start the overall processing of the diesel engine base 5.

[0054] After adopting the present invention, on the one hand, the labor intensity of the operator is obviously greatly reduced, and on the other hand, the production efficiency of the segmented machine base is improved, making the operation safer, eliminating potential safety hazards, and solving the problem of rapid positioning and adjustment of the segmented machine base on the gantry milling machine, achieving the effect of reducing labor intensity, improving the working environment, and improving production efficiency. The present invention can be widely used in the rapid positioning and adjustment of machine bases of different machine models on the gantry milling machine.

[0055] The protection scope required by the present invention is not limited to the above-mentioned embodiments, but should also include other obvious changes and alternatives to the present invention. All equivalent changes and modifications made according to the contents of the present invention belong to the scope of the present invention.

Claims

1. A method for positioning and calibrating a segmented engine base for a marine diesel engine, wherein the segmented engine base comprises a front engine base and a rear engine base connected to form a diesel engine base, and has a finely machined engine base bottom plane and engine base side edges, characterized in that: The positioning calibration method is completed by a positioning calibration device, which includes a positioning assembly, a tightening assembly, and a plurality of iron piers and equal-height pads arranged and supported in sequence from bottom to top under the segmented machine base; the plurality of iron piers are divided into two rows and fixed on both sides of the machine tool worktable, and the positioning assembly is arranged on the iron piers of one side row of the machine tool worktable, and is used to position the segmented machine base, including a positioning backing body, a positioning backing positioning key, and equal-height pads; the tightening assembly is arranged on the iron piers of the other side row of the machine tool worktable, and is used to adjust the straightness of the segmented machine base and limit its displacement, including a tightening backing body, a tightening bolt, a tightening backing positioning key, and a tightening pad; The positioning calibration method comprises:

1. Install the positioning and adjustment device—— Two rows of iron piers are placed on both sides of the machine tool worktable to ensure that the connection between the front section machine base and the rear section machine base is located on the same iron pier after installation, and the iron pier is positioned on the machine tool worktable and fixed by the positioning key; a plurality of equal-height pads of the same height are evenly placed on the top surface of the iron pier according to the width of the bottom plane of the machine base, and the height of the equal-height pads is adjusted by measuring and padding copper sheets to ensure that the upper planes of all equal-height pads are on the same horizontal plane, and then the positioning assembly is installed on the iron piers of one side row, and the support backing body and the support backing positioning key of the tightening assembly are placed and fixed on the iron piers of the other side row; 2. Position and install the front section base: Lift the front machine base, slowly approach it until it is completely close to the equal height pad of the positioning assembly, then slowly lower the front machine base until it is stably placed on the equal height pad, measure whether the side of the machine base is in a straight line with the axis of the machine tool, if there is no deviation, install the tightening bolts and the tightening pads on the tightening backing body of the tightening assembly, and rotate the tightening bolts to tighten the other side of the front machine base through the tightening pad; if there is a deviation in straightness, replace the positioning assembly on the side that needs to be adjusted with the tightening assembly, and after adjusting the straight lines of the front machine base to have no deviation, tighten and fix the front machine base; 3. Position and install the rear section base: Lift the rear section machine base and slowly bring it close to the front section machine base, stop when they are 1-2 meters apart, then slowly lower the rear section machine base until it is 10-20mm away from the equal height pad, move the machine tool worktable to make the front section machine base slowly approach the rear section machine base until the connecting surfaces are in contact; then slowly make the side of the rear section machine base close to the equal height pad of the positioning assembly, and after it is completely close, slowly lower the rear section machine base and place it steadily on the equal height pad, check and use the tightening assembly to support and adjust the top until the deviation of the connecting pin hole is eliminated, and then connect the front section machine base with the rear section machine base through the tightening pin and connecting bolts, and then remeasure the straightness of the side of the front section machine base and the rear section machine base, and after confirmation, tighten the tightening assembly on the other side to complete the positioning and adjustment of the segmented machine base.

2. The method for positioning and adjusting a segmented engine stand for a marine diesel engine according to claim 1 is characterized in that: The positioning key of the positioning backer is fixed to the bottom of the positioning backer body and is positioned on the top of the iron pier through a T-slot. A fixing slot is provided at the lower part of the positioning backer body, and the positioning backer body is fixed to the iron pier through a T-bolt and a nut. The equal height pad is fixedly connected to the front part of the positioning backer body and is tightly attached to one side of the segmented machine base to position it.

3. The method for positioning and adjusting a segmented engine stand for a marine diesel engine according to claim 2 is characterized in that: The positioning requirements of segmented machine bases of various machine models can be met by adjusting the thickness of the equal-height pads.

4. The method for positioning and adjusting a sectional engine stand for a marine diesel engine according to claim 1 or 2, characterized in that: The support backing positioning key is fixed to the bottom of the support backing body and is positioned at the top of the iron pier through a T-slot. At the same time, the support assembly is fixed to the top of the iron pier through a T-bolt and a nut. The support bolt is horizontally screwed to the upper part of the support backing body. The support pad is connected to the front end of the support bolt and is close to the other side of the segmented machine base to protect the side of the machine base from being pulled. The support bolt is rotated and the segmented machine base is pushed through the support pad to adjust the straightness of the segmented machine base.

5. The method for positioning and adjusting a sectional engine stand for a marine diesel engine according to claim 1 is characterized in that: The iron pier is a square box-shaped component with a plurality of T-shaped grooves on the top surface for fixing the positioning assembly and the tightening assembly, and a plurality of positioning grooves and U-shaped grooves on the bottom surface. A positioning key is embedded in the positioning groove, and the positioning key is also embedded in the positioning groove of the machine tool work surface to position the iron pier on the machine tool work surface. The iron pier is connected and fixed to the machine tool work surface through the U-shaped groove.

6. The method for positioning and adjusting the segmented engine base of a marine diesel engine according to claim 5 is characterized in that: The bottom surface of the iron pier is provided with a concave surface to reduce the contact area and avoid inclusion of dust.

7. The method for positioning and adjusting a segmented engine stand for a marine diesel engine according to claim 1 is characterized in that: The sum of the height of the iron pier and the height of the equal-height cushion block is greater than the height of the oil pan of the diesel engine base to avoid interference.

8. The method for positioning and adjusting a sectional engine stand for a marine diesel engine according to claim 1 is characterized in that: In the step 1, the height of the equal height pad is adjusted to ensure that the height deviation is within 0.05 mm.

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