An installation centering device and adjustment method for an expansion joint

Abstract

The application discloses a kind of installation centering device and adjusting installation method of expansion joint, including measuring body and measuring scale, wherein, measuring scale is provided with size scale, is connected to the installation flange of exhaust manifold and the zero line of size scale is located the center line of the installation flange in vertical direction, measuring body includes perpendicular bottom plate and measuring pointer, is connected to exhaust valve flange, and the measuring pointer is located the center line of exhaust valve flange in vertical direction and is directed to measuring scale, according to the size scale on measuring scale that measuring pointer end is directed to, the actual center offset of the installation flange of exhaust manifold and exhaust valve flange is read, according to the deviation of actual center offset and standard value of process requirement, position adjustment is carried out to exhaust manifold assembly.The application is light and easy to operate, reaches the effect of improving measurement precision, improves the accuracy and job efficiency of centering adjustment, can satisfy the assembly process requirement of expansion joint installation.

Description

Technical Field

[0001] This invention relates to the assembly process of marine diesel engines, specifically to an installation and alignment device and adjustment method for an expansion joint, belonging to the field of marine diesel engine manufacturing technology. Background Technology

[0002] Please see Figure 1 The exhaust system of a marine diesel engine mainly includes multiple exhaust valve assemblies (a), an exhaust manifold assembly (b), and expansion joints connecting the two. The expansion joint is a hollow cylindrical structure with circular flanges at both ends and a corrugated body for expansion and contraction adjustment. During engine operation, the exhaust manifold assembly (b) and the expansion joints are in a hot state. The exhaust manifold assembly (b) will thermally expand towards the front and rear ends of the engine. Theoretically, the offset of the exhaust manifold in the middle position is small, while the offset is larger closer to the front and rear ends of the engine. This causes the installation center line of the exhaust manifold assembly (b) and the expansion joints of each cylinder to shift, resulting in the expansion joints being squeezed and deformed. Therefore, the center offset caused by thermal expansion must be taken into account during the installation of the expansion joints of each cylinder, and the installation should be carried out according to the offset required by the process. Since the expansion joint has a corrugated structure and is elastic, before installing the expansion joint, the center line of the flange of the exhaust valve assembly a is used as a reference to measure the center line of the expansion joint mounting flange of each cylinder on the exhaust manifold assembly b. Based on the measured data of each cylinder, the position of the exhaust manifold is adjusted forward and backward to meet the offset required by the process.

[0003] The method for measuring and adjusting the installation alignment of the existing exhaust manifold expansion joint is as follows:

[0004] 1) Install the exhaust valve assembly a of each cylinder according to the positioning reference line on the cylinder block, and tighten the mounting bolts to fix it on the cylinder block;

[0005] 2) Lift the exhaust manifold assembly b to the installation position and pre-position the support plate at the bottom of the exhaust manifold assembly b;

[0006] 3) Connect and fix the flange of one end of the expansion joint of each cylinder to the flange of the exhaust valve assembly a, and then compare the center line of the flange of the other end of the expansion joint with the center line of the expansion joint mounting flange of each cylinder on the exhaust manifold assembly b, and measure the deviation of the two center lines.

[0007] 4) Compare the actual offset of the center line of each cylinder mounting flange of the exhaust manifold assembly b with the standard offset required by the process, and calculate the direction and value of the front and rear adjustment of the exhaust manifold assembly b based on the comparison results.

[0008] 5) Loosen the fixing bolts of the support plate at the bottom of the exhaust manifold assembly b, adjust the position of the exhaust manifold assembly b to the front and rear ends, and pre-tighten the fixing bolts of the support plate;

[0009] 6) Remeasure the center offset of each cylinder according to the method in step 3). If the standard offset meets the process requirements, tighten the support plate fixing bolts of the exhaust manifold assembly b and install the positioning pin to fix the exhaust manifold assembly b on the main unit.

[0010] 7) Tighten the connecting bolts of the expansion joint flange on the exhaust manifold assembly b.

[0011] The above method for aligning, inspecting, adjusting, and installing the expansion joint of the marine diesel engine exhaust manifold has the following drawbacks:

[0012] 1. Directly using expansion joints for positioning is inconvenient due to the large weight of the expansion joints, resulting in low work efficiency.

[0013] 2. Directly using the flanges at both ends of the expansion joint for positioning and measurement makes it difficult to identify the flange centerline, resulting in a large measurement error;

[0014] 3. Expansion joints are prone to expansion and contraction, making measurement results inaccurate and affecting the adjustment of the exhaust manifold assembly, which can easily lead to rework and repeated operations.

[0015] 4. Repeated lifting operations are required, which takes up a lot of time in the workshop's lifting equipment and reduces the effective utilization rate of the equipment.

[0016] Therefore, there is an urgent need to improve the above-mentioned methods for installing, aligning, and adjusting expansion joints in order to improve installation accuracy and work efficiency. Summary of the Invention

[0017] The purpose of this invention is to provide an installation centering device and adjustment method for expansion joints, which can accurately measure the center offset of the expansion joint before installation, and then quickly adjust the position of the exhaust manifold assembly to meet the assembly process requirements of expansion joint installation, thereby improving measurement accuracy, centering adjustment accuracy and work efficiency.

[0018] To achieve the above objectives, the technical solution of the present invention is as follows:

[0019] An installation alignment device for an expansion joint, wherein the expansion joint is connected between the exhaust valve flange of each cylinder of a marine diesel engine and the installation flange of the exhaust manifold, characterized in that: the installation alignment measuring device includes a measuring instrument body and a measuring scale; the measuring instrument body includes a base plate and a measuring pointer, the measuring pointer being a long rod-shaped component vertically fixed to the base plate; the measuring scale is a thin plate-shaped component with a dimensional scale on it, the measuring scale being connected to the installation flange of the exhaust manifold by fasteners, and the zero line of the dimensional scale being located on the vertical center line of the installation flange; the base plate of the measuring instrument body is connected to the exhaust valve flange by fasteners; the measuring pointer is located on the vertical center line of the exhaust valve flange and points to the measuring scale; based on the dimensional scale on the measuring scale pointed to by the end of the measuring pointer, the actual center offset between the installation flange of the exhaust manifold and the exhaust valve flange can be read.

[0020] Furthermore, the end of the measuring pointer is provided with a groove for comparing the size scale.

[0021] Furthermore, a reinforcing plate is fixedly connected between the base plate and the root of the measuring pointer.

[0022] Furthermore, the base plate of the measuring instrument body is provided with multiple mounting holes at different intervals.

[0023] Furthermore, the mounting hole is a round hole or an oblong hole.

[0024] Another technical solution of the present invention is:

[0025] An adjustment and installation method for an expansion joint using the above-mentioned installation alignment device includes the following steps:

[0026] 1) Based on the positioning reference line on the marine diesel engine cylinder block, fix each exhaust valve assembly on the corresponding cylinder block, hoist the exhaust manifold assembly to the installation position, and pre-install the support plate at the bottom of the exhaust manifold assembly;

[0027] 2) Select a suitable mounting hole and install the measuring scale onto the mounting flange of the exhaust manifold using fasteners, ensuring that the zero line of the size scale is located on the center line of the mounting flange in the vertical direction. Similarly, install the measuring instrument body onto the exhaust valve flange, ensuring that the measuring pointer is located on the center line of the exhaust valve flange in the vertical direction and points to the measuring scale.

[0028] 3) Compare the end of the measuring pointer with the size scale on the measuring scale, measure the offset value between the end of the measuring pointer and the zero line of the size scale, which is the actual center offset between the mounting flange of the exhaust manifold and the exhaust valve flange, and record it;

[0029] 4) Repeat steps 2) and 3) to measure and record the actual center offset between the mounting flange of the exhaust manifold and the exhaust valve flange on all cylinder blocks;

[0030] 5) Compare the actual center offset of each cylinder obtained from step 4) with the standard value required by the process, and calculate the adjustment direction and adjustment data of the exhaust manifold assembly.

[0031] 6) Loosen the fixing bolts of the lower support plate of the exhaust manifold assembly, adjust the position of the exhaust manifold assembly according to the position adjustment direction and adjustment data obtained in step 5), and then tighten the fixing bolts of the support plate again.

[0032] 7) Repeat steps 2) and 3) to remeasure the center offset between the mounting flange of the exhaust manifold and the exhaust valve flange of each cylinder. If the standard value required by the process is not met, repeat step 6) to readjust the position of the exhaust manifold assembly. If the standard value required by the process is met, tighten the fixing bolts of the support plate and prepare the installation positioning pin on site to fix the exhaust manifold assembly on the main unit.

[0033] 8) Complete the fixed installation of each cylinder expansion joint between the mounting flange of the exhaust manifold and the exhaust valve flange.

[0034] Compared with the prior art, the beneficial effects of the present invention are:

[0035] 1) The installation and alignment device is lightweight and easy to operate, which improves the efficiency of measurement and adjustment operations;

[0036] 2) Improved measurement accuracy, reduced repeated adjustments to the exhaust manifold assembly, and ensured that the expansion joint could meet the process assembly requirements during installation.

[0037] 3) It reduced the frequency of use of lifting equipment in the workshop and increased the effective utilization time of the equipment. Attached Figure Description

[0038] Figure 1 This is a schematic diagram showing the installation and connection of the exhaust manifold assembly and the exhaust valve assembly.

[0039] Figure 2 This is a diagram showing the usage state of the present invention.

[0040] Figure 3 This is a schematic diagram of the measuring instrument body.

[0041] In the picture,

[0042] 1—Measuring instrument body, 11—Base plate, 12—Measuring pointer, 13—Reinforcing plate, 2—Measuring scale, 3—Fasteners, a—Exhaust valve assembly, a1—Exhaust valve flange, b—Exhaust manifold assembly, b1—Mounting flange. Detailed Implementation

[0043] This invention relates to the alignment measurement and adjustment installation of expansion joints in marine diesel engine exhaust systems. Please refer to [link / reference]. Figure 2 Each cylinder of the marine diesel engine has an expansion joint connected between the exhaust valve flange a1 and the exhaust manifold mounting flange b1. The exhaust manifold assembly b operates under high temperature conditions, so it will undergo thermal expansion along its length towards the front and rear ends of the main engine. To prevent the expansion joints from being squeezed and deformed during operation, it is required that the centers of the front and rear flanges of the expansion joints of each cylinder be kept on the same straight line during the operation of the main engine. However, the expansion joint is installed in a cold state, at which time the exhaust manifold assembly b is in a contracted state. Therefore, there will be a misalignment between the center of the mounting flange b1 of each cylinder and the center of the exhaust valve flange a1 on the exhaust manifold assembly b. In order to ensure that the front and rear flanges of the expansion joint are exactly on the same center line under hot working conditions after installation, so as to avoid deformation due to compression, the center misalignment between the mounting flange b1 of the exhaust manifold and the exhaust valve flange a1 under cold conditions must be taken as the preset standard value of the installation process requirement. Before the expansion joint is assembled, the position of the exhaust manifold assembly b is adjusted according to the standard value of the process requirement, so that the relative position of the mounting flange b1 of each cylinder and the exhaust valve flange a1 achieves the purpose of the expansion joint of each cylinder being exactly in a straight line under hot conditions after installation.

[0044] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments, but this should not be construed as limiting the scope of protection of the present invention.

[0045] Please see Figure 2 The installation and alignment device for the expansion joint includes a measuring instrument body 1 and a measuring scale 2. The measuring instrument body 1 is connected to the exhaust valve flange a1 via fasteners 3, and the measuring scale 2 is connected to the exhaust manifold mounting flange b1 via fasteners 3. The fasteners 3 are cylindrical structures with a limiting function.

[0046] Please see Figure 3The measuring instrument body 1 includes a base plate 11 and a measuring pointer 12. The measuring pointer 12 is a long trapezoidal rod, vertically welded to the base plate 11. A reinforcing plate 13 is welded between the base plate 11 and the root of the measuring pointer 12 to improve the rigidity and strength of the measuring instrument body 1. The end of the measuring pointer 12 is provided with a groove. The base plate 11 has a rectangular structure with multiple mounting holes for fasteners 3 to pass through. These mounting holes are round holes or oblong holes, and the spacing between them can be different to adjust the relative position of the measuring instrument body 1 and the flange hole on the exhaust valve flange a1.

[0047] The measuring scale 2 is a thin plate-shaped component with size scales and multiple mounting holes for fasteners 3 to pass through. Similarly, the mounting holes are round holes or oblong holes, and the spacing between them can be different, so as to adjust the relative position of the measuring scale 2 and the flange hole on the mounting flange b1.

[0048] Please see Figure 2 After the measuring instrument body 1 and the measuring scale 2 are installed and their positions adjusted, the zero line of the measuring scale 2 is located on the vertical center line of the mounting flange b1, and the measuring pointer 12 is located on the vertical center line of the exhaust valve flange a1. The groove at the end of the measuring pointer 12 points to the measuring scale 2 for comparison with the dimensional scale. Based on the dimensional scale on the measuring scale 2 pointed to by the end of the measuring pointer 12, the center offset between the mounting flange b1 of the exhaust manifold and the exhaust valve flange a1 can be read.

[0049] The adjustment and installation method of the expansion joint described in this invention includes the following steps:

[0050] 1) Based on the positioning reference line on the marine diesel engine cylinder block, fix each exhaust valve assembly a on the corresponding cylinder block and tighten the mounting bolts. Hoist the exhaust manifold assembly b to the installation position and pre-position the support plate at the bottom of the exhaust manifold assembly b.

[0051] 2) Select a suitable mounting hole on the measuring scale 2, and install the measuring scale 2 on the flange hole on the upper part of the mounting flange b1 of the exhaust manifold using fasteners 3, so that the zero line of the scale on the measuring scale 2 is located on the center line of the mounting flange b1 in the vertical direction; similarly, select a suitable mounting hole on the base plate 11, and install the measuring instrument body 1 on the flange hole on the upper part of the exhaust valve flange a1 using fasteners 3, so that the measuring pointer 12 is located on the center line of the exhaust valve flange a1 in the vertical direction, and the groove at the end of the measuring pointer 12 points to the measuring scale 2.

[0052] 3) Compare the groove at the end of the measuring pointer 12 with the size scale on the measuring scale 2, measure the offset value between the end of the measuring pointer 12 and the zero line of the size scale, which is the actual center offset between the mounting flange b1 of the exhaust manifold and the exhaust valve flange a1, and record it.

[0053] 4) Remove the measuring instrument body 1 and measuring scale 2 that have been measured. Repeat steps 2) and 3) on other cylinders to complete the measurement of the actual center offset between the mounting flange b1 of the exhaust manifold and the exhaust valve flange a1 on all cylinders, and record it.

[0054] 5) Compare the actual center offset of each cylinder obtained from step 4) with the standard value required by the process, and calculate the adjustment direction and adjustment data to achieve the position of the exhaust manifold assembly b.

[0055] 6) Loosen the fixing bolts of the lower support plate of the exhaust manifold assembly b, adjust the position of the exhaust manifold assembly b according to the position adjustment direction and adjustment data obtained in step 5), and then tighten the fixing bolts of the support plate again.

[0056] 7) Repeat steps 2) and 3) to remeasure the center offset between the mounting flange b1 of the exhaust manifold of each cylinder and the exhaust valve flange a1. If the standard value required by the process is not met, repeat step 6) to readjust the position of the exhaust manifold assembly b. If the standard value required by the process is met, tighten the fixing bolts of the support plate and prepare the installation positioning pin on site to fix the exhaust manifold assembly b on the main unit.

[0057] 8) Complete the fixed installation of each cylinder expansion joint between the mounting flange b1 of the exhaust manifold and the exhaust valve flange a1, ensuring that the installation of all expansion joints meets the process assembly requirements.

[0058] The scope of protection claimed by this invention is not limited to the above embodiments, but should also include other variations and alternatives that are obvious to this invention.

Claims

1. An installation and alignment device for an expansion joint, wherein the expansion joint is connected between the exhaust valve flange of each cylinder of a marine diesel engine and the installation flange of the exhaust manifold, characterized in that: The installation alignment measuring device includes a measuring instrument body and a measuring scale. The measuring instrument body includes a base plate and a measuring pointer. The measuring pointer is a long rod-shaped component, vertically fixed to the base plate. The measuring scale is a thin plate-shaped component with dimensional graduations. The measuring scale is connected to the mounting flange of the exhaust manifold by fasteners, and the zero line of the dimensional graduations is located on the vertical center line of the mounting flange. The base plate of the measuring instrument body is connected to the exhaust valve flange by fasteners. The measuring pointer is located on the vertical center line of the exhaust valve flange and points to the measuring scale. Based on the dimensional graduations on the measuring scale pointed to by the end of the measuring pointer, the actual center offset between the mounting flange of the exhaust manifold and the exhaust valve flange can be read.

2. The installation and alignment device for the expansion joint according to claim 1, characterized in that: The end of the measuring pointer is provided with a groove for comparing the size scale.

3. The installation and alignment device for the expansion joint according to claim 1, characterized in that: A reinforcing plate is fixedly connected between the base plate and the root of the measuring pointer.

4. The installation and alignment device for the expansion joint according to claim 1, characterized in that: The base plate of the measuring instrument body is provided with multiple mounting holes with different spacing.

5. The installation and alignment device for the expansion joint according to claim 4, characterized in that: The mounting hole is either a round hole or an oblong hole.

6. A method for adjusting and installing an expansion joint using the installation alignment device described in claim 1, characterized in that: The adjustment and installation method includes the following steps: 1) Based on the positioning reference line on the marine diesel engine cylinder block, fix each exhaust valve assembly on the corresponding cylinder block, hoist the exhaust manifold assembly to the installation position, and pre-install the support plate at the bottom of the exhaust manifold assembly; 2) Select a suitable mounting hole and install the measuring scale onto the mounting flange of the exhaust manifold using fasteners, ensuring that the zero line of the size scale is located on the center line of the mounting flange in the vertical direction. Similarly, install the measuring instrument body onto the exhaust valve flange, ensuring that the measuring pointer is located on the center line of the exhaust valve flange in the vertical direction and points to the measuring scale. 3) Compare the end of the measuring pointer with the size scale on the measuring scale, measure the offset value between the end of the measuring pointer and the zero line of the size scale, which is the actual center offset between the mounting flange of the exhaust manifold and the exhaust valve flange, and record it; 4) Repeat steps 2) and 3) to measure and record the actual center offset between the mounting flange of the exhaust manifold and the exhaust valve flange on all cylinder blocks; 5) Compare the actual center offset of each cylinder obtained from step 4) with the standard value required by the process, and calculate the adjustment direction and adjustment data of the exhaust manifold assembly. 6) Loosen the fixing bolts of the lower support plate of the exhaust manifold assembly, adjust the position of the exhaust manifold assembly according to the position adjustment direction and adjustment data obtained in step 5), and then tighten the fixing bolts of the support plate again. 7) Repeat steps 2) and 3) to remeasure the center offset between the mounting flange of the exhaust manifold and the exhaust valve flange of each cylinder. If the standard value required by the process is not met, repeat step 6) to readjust the position of the exhaust manifold assembly. If the standard value required by the process is met, tighten the fixing bolts of the support plate and prepare the installation positioning pin on site to fix the exhaust manifold assembly on the main unit. 8) Complete the fixed installation of each cylinder expansion joint between the mounting flange of the exhaust manifold and the exhaust valve flange.

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