Efficient installation method of energy-saving guide wheel

Abstract

The invention belongs to the technical field of ocean engineering, and particularly relates to an efficient mounting method for an energy-saving guide wheel, which comprises the following steps: S1, a first group of standing sites and a second group of standing sites are separated, and the second group of standing sites are arranged at a tail shaft segmented hull structure; s2, establishing an energy-saving guide wheel and tail shaft casting pre-assembly model, and obtaining interference amount data between a guide vane of the energy-saving guide wheel and the tail shaft casting; the interference amount data comprises a carrying intersecting line generated by connecting interference points of a tail shaft casting and a guide vane on the energy-saving guide wheel and tail shaft casting pre-assembly model, and a boundary line which takes the carrying intersecting line as allowance cutting; s3, zero-allowance cutting is conducted on the guide vane according to the interference amount data; s4, the tail shaft casting is placed on the first set of standing sites, and the tail shaft casting is sealed and fixed; s5, the energy-saving guide wheel cut in the step S3 is pre-assembled to a tail shaft casting, and a first pre-assembled section is obtained; and S6, the first pre-assembly section is assembled on the tail shaft section. According to the method, the aloft work amount is reduced, safety is higher, and the assembly period can be shortened by more than 5 days.

Description

Technical Field

[0001] The present invention relates to the field of marine engineering technology, and more specifically to a method for efficiently installing an energy-saving guide wheel. Background Art

[0002] A fairing (energy-saving guide wheel) is designed and installed on the tail shaft outlet casting at the rear of a certain type of ship. The main function of the fairing is to guide and converge the water flow when the propeller driven by the main engine rotates, thereby providing a water flow bundling effect for the propeller. Under the same power conditions, the ship's sailing speed is improved to a certain extent, achieving the goal of energy conservation and emission reduction.

[0003] The air guide shroud is an energy-saving device installed on the tail shaft casting. It is mainly composed of a guide wheel and a guide vane. The installation position and angle of each guide vane are different. The intersection curves are also different in the area where the guide vane and the casting meet. The design adds a margin of about 50mm at the junction of the air guide shroud guide vane and the casting, which is used for on-site workers to cut, repair and grind when positioning the air guide shroud.

[0004] When positioning the fairing, a crane is used to hoist it close. After the surveyors use the total station to measure and align it, the construction workers cut and grind the guide vanes of the guide wheel. Due to the large amount of grinding and each grinding is based on the actual gap and interference between the guide vanes and the castings at 5 different angles, according to the construction experience, the conventional guide wheel positioning process takes about 10 to 12 hours, and it is easy to have a large gap during the margin cutting and grinding, and the guide wheel positioning accuracy is difficult to guarantee. In addition, the usual construction sequence is: first, the hull structure is formed, other structures are assembled and the outer plate is welded, and the tail casting is assembled after completion. After completion, the fairing is hoisted to the tail shaft segmented hull structure for matching. This method is completed sequentially on a tire frame, resulting in a long completion period for the entire segment; in addition, when the guide wheel is hoisted and matched, the 50mm long margin needs to be gradually cut and trimmed, which takes too long and is difficult to construct; in addition, this method causes the fairing to be high from the ground, and construction safety is difficult to guarantee. Summary of the invention

[0005] In order to solve the problems in the prior art of assembling the energy-saving guide wheel and the tail shaft segments, such as the large amount of cutting and grinding, the large gap that may easily appear during the excess cutting and grinding, the long guide wheel positioning process, the difficulty in ensuring the positioning accuracy of the guide wheel, the existing construction method causing the energy-saving guide wheel to be at a large height from the ground, and the difficulty in ensuring construction safety, the present invention provides a high-efficiency installation method for an energy-saving guide wheel. Through a separate assembly site, the energy-saving guide wheel and the tail shaft segment are pre-assembled and welded to obtain a pre-assembled segment, and then the obtained pre-assembled segment is assembled to the tail shaft segment hull structure, thereby reducing the amount of high-altitude operations, being safer, and shortening the assembly period by more than 5 days.

[0006] In order to achieve the above object, the present invention provides an efficient installation method of an energy-saving guide wheel, comprising the following steps:

[0007] S1, separating a first group of stand sites and a second group of stand sites, wherein the second group of stand sites is arranged at the tail shaft segmented hull structure;

[0008] S2. Establish a pre-assembly model of the tail shaft casting and the energy-saving guide wheel to obtain interference data between the guide vanes of the energy-saving guide wheel and the tail shaft casting;

[0009] S3, marking a boundary line for margin cutting on the guide vane according to the interference data, and performing margin-free cutting on the guide vane;

[0010] S4, placing the tail shaft casting on the first group position and sealing the tail shaft casting;

[0011] S5, pre-assembling the energy-saving guide wheel cut in step S3 onto the tail shaft casting, welding, and obtaining a first pre-assembly section;

[0012] S6. Assemble the first pre-assembled segment onto the tail shaft segment.

[0013] In a preferred embodiment, the first group of positions is configured to be adjacent to the second group of positions.

[0014] In the preferred embodiment, in step S2, a pre-assembly model of the energy-saving guide wheel and the tail shaft casting is established, including the following steps:

[0015] Sa1, pre-assemble the tail shaft casting to the tail shaft segmented hull structure;

[0016] Sa2. Establishing a tail shaft casting model: Establishing the tail shaft casting model includes marking a number of first measuring points on the outer contour surface of the tail shaft casting using a total station, collecting data of the first measuring points, and then establishing the tail shaft casting model using CAD;

[0017] Sa3. Generate an energy-saving guide wheel design model: Use a total station to mark a number of second measurement points on the guide wheel and guide vane of the energy-saving guide wheel to generate an energy-saving guide wheel design model;

[0018] Sa4, matching and connecting the tail shaft casting model and the energy-saving guide wheel design model, generating a tail shaft casting and energy-saving guide wheel pre-assembly model, and obtaining interference data;

[0019] The interference data includes a carrying intersection line formed by connecting a number of interference points formed between the guide vane of the energy-saving guide wheel and the tail shaft casting in the tail shaft casting and energy-saving guide wheel pre-assembly model, and the carrying intersection line is used as a boundary line for margin cutting; the interference points are the intersection points of the outer contour of the guide vane and the contour surface of the tail shaft casting;

[0020] Sa5. Draw an actual intersection line on the guide vane according to the interference data, and cut the remaining amount of the guide vane along the actual intersection line.

[0021] In a preferred embodiment, in step S2, a plurality of the first measuring points cover the outer contour surface of the tail shaft casting, a plurality of the first measuring points are equidistant points, and a span value between two adjacent first measuring points is 100 to 200 mm.

[0022] In a preferred embodiment, in step S4, the matching connection includes establishing a plurality of management points at a plurality of the second measurement points, and matching and connecting the management points with the first measurement points by using the analysis function of the precision software ECO OTS.

[0023] Under the preferred scheme, in step S4, before the matching connection, the precision software BLOCK is used to adjust the position of the tail shaft casting model to the theoretical design position of the tail shaft casting on the tail shaft segmented hull structure, and then the position of the energy-saving guide wheel design model is adjusted to the theoretical design position of the energy-saving guide wheel on the tail shaft casting.

[0024] Under the preferred scheme, in step S2, taking the center point on the tail end surface of the tail shaft casting as the intersection point, a total station is used to survey the intersection lines of the tail shaft casting and the cross-section of the tail shaft casting, and the intersection lines of the tail shaft casting and the longitudinal section of the tail shaft casting; in step S3, taking the center of the guide wheel as the reference, a total station is used to survey the main reference lines on the guide wheel of the energy-saving guide wheel, the main reference lines include the intersection lines of the guide wheel and the cross-section of the guide wheel, the intersection lines of the guide wheel and the longitudinal section of the guide wheel, and the intersection lines of the guide wheel and the horizontal mid-section of the guide wheel, the intersection points between the main reference lines serve as the main reference line points, and the second measuring points have the main reference line points; in step S4, the cross-section of the guide wheel and the cross-section of the tail shaft casting are arranged on the same vertical plane.

[0025] Under the preferred embodiment, the first measuring point includes a first measuring point on the intersection line of the tail shaft casting and the cross-section of the tail shaft casting and a first measuring point on the intersection line of the tail shaft casting and the longitudinal section of the tail shaft casting. The first measuring point on the intersection line of the tail shaft casting and the cross-section of the tail shaft casting and the first measuring point on the intersection line of the tail shaft casting and the longitudinal section of the tail shaft casting are marked on the tail shaft casting model. The theoretical design position of the energy-saving guide wheel pre-assembled on the tail shaft casting is at the same height as the main reference line point. When matched and connected, the main reference line point is matched and connected with the first measuring point on the intersection line of the tail shaft casting and the cross-section of the tail shaft casting and the first measuring point on the intersection line of the tail shaft casting and the longitudinal section of the tail shaft casting.

[0026] In a preferred embodiment, a cutting torch is used to perform excess cutting on the guide vanes.

[0027] In a preferred embodiment, the second measuring point on the guide vane includes the intersection of the internal reinforcement structure of the guide vane and the curved plate of the guide vane.

[0028] Under the preferred embodiment, the main reference line points include the guide wheel side reference point of the intersection line of the guide wheel and the guide wheel cross-section and the intersection line of the guide wheel and the guide wheel horizontal mid-section, and the guide wheel upper center reference point of the intersection line of the tail shaft casting and the tail shaft casting longitudinal section and the intersection line of the guide wheel and the guide wheel horizontal mid-section.

[0029] The beneficial effects of the present invention are:

[0030] 1. The present invention pre-assembles the energy-saving guide wheel and the tail shaft casting, and then assembles the assembled energy-saving guide wheel and the tail shaft casting to the tail shaft casting hull structure. Compared with the original assembly scheme (pre-assembling the tail shaft casting to the tail shaft segmented hull structure first, and then assembling the energy-saving guide wheel to the tail shaft casting), the height of the fairing from the ground is reduced, the amount of high-altitude work on site is reduced, and during the fairing assembly and welding process, the operation is more convenient and the construction is safer.

[0031] 2. The efficient installation method of the energy-saving guide wheel provided by the present invention can shorten the construction period by more than 5 days compared with the original assembly scheme.

[0032] 3. In the present invention, when the tail shaft casting and the fairing are pre-assembled first and then pre-assembled with the tail shaft segmented hull structure, the convenience of tail shaft segmented lifting and adjustment is greatly improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the coordinate collection of the outer contour points of the tail shaft casting and the distribution of the baseline;

[0034] Figure 2 It is a three-dimensional diagram of the distribution of energy-saving guide wheel measurement points and baseline distribution;

[0035] Figure 3 This is a three-dimensional picture of the energy-saving guide wheel after it is pre-assembled to the tail shaft casting;

[0036] Figure 4 It is a stereoscopic view of the energy-saving guide wheel and tail shaft casting pre-assembly after being installed on the tail shaft segment.

[0037] In the figure, 1-tail shaft casting; 2-tail shaft segment; 3-first measuring point; 4-guide wheel; 5-guide vane; 6-transverse reference line on the guide wheel (intersection line of the guide wheel and the horizontal mid-section of the guide wheel); 7-main reference line (including the intersection line of the guide wheel and the horizontal mid-section of the guide wheel, and the center reference line on the guide wheel); 7a-intersection line of the guide wheel and the cross section of the guide wheel (the center reference line on the guide wheel); 7b-intersection line of the guide wheel and the longitudinal section of the guide wheel (the center reference line on the guide wheel); 8-main structural point (guide wheel The measuring point of the blade interface is the intersection of the internal reinforcement structure of the guide vane and the curved plate of the guide vane); 9-tail shaft casting pier; 10-segment horizontal reference line; 11-segment longitudinal reference line; 12-center point of the tail shaft casting port; 13-guide wheel side reference point (1 on each side); 14-center reference point on the guide wheel; 15-line bob; 20-intersection line of the tail shaft casting and the cross section of the tail shaft casting; 21-intersection line of the tail shaft casting and the longitudinal section of the tail shaft casting; 22-main reference line point. DETAILED DESCRIPTION

[0038] The following will provide further explanation in conjunction with embodiments and drawings.

[0039] The present invention discloses a method of using a total station for measurement and analysis and pre-preparing positioning reference lines on a tail shaft casting and an energy-saving guide wheel, and then using the total station to measure the reference lines of the tail shaft casting and the reference lines on the fairing, and through precise measurement and analysis, the energy-saving guide wheel and the tail shaft casting are first pre-assembled into a pre-assembled section, and then the pre-assembled section is pre-assembled with the tail shaft segment to form a complete segment. This construction method has the following advantages: 1. The energy-saving guide wheel is pre-assembled with the tail shaft casting, which reduces the height of the energy-saving guide wheel from the ground compared with the original assembly scheme. During the assembly and welding of the energy-saving guide wheel, the operation is more convenient and the construction is safer; 2. Construction in this construction method can shorten the construction period by 5 days compared with the original assembly method; 3. After the tail shaft casting and the energy-saving guide wheel are pre-installed and then pre-assembled with the hull structure, the convenience of lifting and adjusting the tail shaft casting segments is greatly improved.

[0040] After the energy-saving guide wheel is pre-assembled, the streamlined guide wheel is first welded to the tail shaft casting with the tail shaft segmented structure. The total station is used for three-dimensional measurement. The function of building a model based on the measured points and lines in CAD is used. The precision software BLOCK analysis and 1-point movement, 1-point axis rotation and ECO OTS simulated mounting functions are used to simulate the mounting of the guide wheel model and the tail shaft casting model. The data of the gap and interference between the guide wheel and the casting are obtained through simulated mounting. Based on the actual interference data, the actual intersection line between the guide vane and the casting is drawn on the guide wheel. The construction personnel pre-cut the guide vane end allowance based on the actual intersection line. After precise cutting, the guide wheel and the casting are assembled and welded.

[0041] Example 1

[0042] like Figures 1 to 4As shown, an efficient installation method for energy-saving guide wheel (deflector) without residual pre-assembly mainly includes several process steps:

[0043] In the first group of positions, do the following:

[0044] Sa1. Divide section 1100 (section 1100 is the number of the tail shaft section. In the shipyard, the tail shaft section is usually divided into 1100 sections) into two adjacent assembly positions, one with tail shaft casting 1 as the reference section, and the tail outlet reference surface of tail shaft casting 1 as the tread (the tail end face of the tail shaft casting shaft hole faces upward), adjust it until the tail end face of the tail shaft casting 1 shaft hole is completely horizontal, and the overlap deviation of the upper and lower end faces of the tail shaft casting 1 shaft hole is ≤2mm, and seal the tail shaft casting.

[0045] Sa2, using the cross line on the tail end surface of the tail shaft casting 1 as the reference line, make a cross reference line in the entire construction tire frame range as the energy-saving guide wheel positioning reference line;

[0046] Sa3. Before positioning the energy-saving guide wheel, first mark out measurement points on the surface of the tail shaft casting. These measurement points cover the entire surface of the tail shaft casting, and the distance between adjacent measurement points is set between 100mm and 150mm.

[0047] Sa4. Use a total station to measure the measuring points marked on the contour of the tail shaft casting one by one, import the measured data into the computer, open it with CAD software, connect the three adjacent measured points to form a triangle, the smallest triangle is the smallest unit plane, and a single triangle is a unit plane. Connect all the triangular planes together to form a complete tail shaft casting outer contour surface model, and render the tail shaft casting contour surface model in the CAD software.

[0048] Sa5. Use the total station to draw the main reference lines and reference points on the energy-saving guide wheel, and determine the design value parameters of the reference points and reference lines, including: the transverse rib position line of a certain rib position number (FRX) (the intersection line of the guide wheel and the horizontal mid-section of the guide wheel 6), the horizontal line 7 that is consistent with the height of the hull axis, and the center line of the intersection of the longitudinal sections of the hull.

[0049] Sa6. Use a total station to measure the three-dimensional data of the energy-saving guide wheel. The main measuring points include: the intersection of the internal reinforcement plate of the guide vane at the end of the guide vane and the curved plate of the guide vane. In addition, the management point can also be determined according to the size of the casting surface value. The distance between adjacent management points is set to be approximately 200mm. You can also choose the intersection of the internal reinforcement structure of the guide vane and the curved plate of the guide vane. At the same time, it includes: the transverse rib position line 6 of a certain rib position number (FRX), the horizontal line 7 that is consistent with the height of the hull axis, the center point 13 of the intersection of the longitudinal section of the hull, etc.

[0050] Sa7. Open the tail shaft casting model data in the precision software BLOCK, take the center of the tail shaft casting shaft hole as the reference point, and adjust the coordinates of the center point of the tail shaft casting shaft hole to be consistent with the hull design value through one-point movement and one-point shaft rotation. The X-coordinate of the tail end face of the tail shaft casting is 10mm tailward compared with the design value. 10mm is the machining amount, and the tail shaft casting model is consistent with the hull design status.

[0051] Sa8. Read the energy-saving guide wheel design model in the precision software BLOCK (the energy-saving guide wheel is a design model), and establish management points on the design model as needed. The spacing between the management points is determined according to the size of the casting surface value. Generally, the distance between adjacent management points is set to be about 200mm. You can also choose the intersection of the internal reinforcement structure of the guide vane and the guide vane curved plate. In addition, the management point for the positioning reference point needs to be set on the energy-saving guide wheel curved plate surface. The set management point must be the same as the coordinates of the intersection of the horizontal reference line and the longitudinal reference line on the energy-saving guide wheel. Use the analysis function to match and connect the measured data with the model. By moving one point, the reference points 13 (1 on each side) and 14 are made to be consistent with the theoretical values, with a maximum deviation of ≤2mm, and saved as an analysis file.

[0052] In the second group of positions, do the following:

[0053] Sb1. Pre-assemble the tail shaft casting to the tail shaft segmented hull structure, and use a total station to survey the projection center of the segmented tail shaft, the longitudinal section line and the waterline cross-type ground sample line based on the center of the tail shaft fore and aft casting ports;

[0054] Sb2. Use a total station to measure the equidistant points marked on the casting, and use the total station to measure the three-dimensional coordinates of the equidistant points on the contour of the tail shaft casting. Import the measurement data into the computer, open it with CAD software, connect the measured points with three adjacent points to form a triangle, take a single triangle as a unit section, connect all the unit sections together, and use the polygon function of the software to model and render;

[0055] Sb3. Create a model of the coordinate group in the CAD program. After the model is hidden, it is consistent with the shape of the actual tail shaft casting and saved as a DXF file;

[0056] Sb4. Save the coordinate file of the guide wheel measured by the total station as a DXF file.

[0057] Sb5. Read the casting model file in the precision software BLOCK program, perform 1-point movement and 1-point axis rotation under the BLOCK program, make the baseline data actually measured to the tail shaft casting consistent with the design value, use 1-point movement to make the coordinates of the center point of the tail end face of the tail shaft casting shaft hole consistent with its design value, make the tail end face of the tail shaft casting shaft hole face 10mm (machining amount) towards the tail in the fore-to-tail direction, and save it as an analysis file.

[0058] Sb6. Use precision software BLOCK to open the saved DXF file of the guide wheel. In the BLOCK analysis function, move to point 1 and rotate the axis at point 1 to make the coordinates of the reference line on the guide wheel coincide with the established management point. The management point system automatically generates the theoretical value of the management point and saves it as an analyzed file.

[0059] Sb7. Open the casting analysis file in the precision software ECO OTS, and then open the analysis file of the energy-saving guide wheel. Automatically connect the corresponding measurement points in the software ECO OTS program. After each measurement point is automatically connected, a certain amount of interference information is generated in the X / Y / Z direction (the coordinates of the bow and stern are the X axis, the width of the ship, that is, the left and right of the hull center is the Y axis, and the upper and lower parts of the hull are the Z axis). The on-site construction personnel draw the interference boundary line on the guide vane according to the interference data. The boundary line is the actual margin cutting line of the guide vane;

[0060] The excess cutting line forms an actual intersection curve. The construction workers can make precise cutting according to this intersection curve and remove the excess for the guide wheel in advance. This method can accurately mark the excess line of the docking port and use a cutting torch to cut the excess so that the energy-saving guide wheel guide vane reaches a state of no excess, and then pre-assemble it with the tail ball casting and weld it to form a pre-assembled section.

[0061] At the first assembly site, 1100 sections are assembled in sections to form 1100 sections of the hull structure. The tail shaft casting and the pre-assembled structure of the energy-saving guide wheel are hoisted and assembled with the 1100 sections of the hull structure to finally form 1100 sections. This solution can achieve the pre-assembly of the energy-saving guide wheel without any margin, and the energy-saving guide wheel and the tail ball structure can be hoisted and positioned at one time, which improves the positioning accuracy, improves the construction efficiency, and reduces the construction difficulty.

[0062] The present invention innovatively realizes high-precision segmented positioning of the energy-saving guide wheel, pre-assembles the energy-saving guide wheel and the tail ball casting, and assembles and builds the tail shaft segment at another segmentation site, thereby improving construction efficiency, improving on-site operation convenience, saving crane resources, reducing high-altitude operations, improving construction safety, and achieving the goal of reducing shipbuilding costs while ensuring positioning accuracy. This process has been implemented on the C16K-7\9# ship, with good results, and will be expanded and promoted on subsequent ships under construction.

[0063] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. An efficient installation method for an energy-saving guide wheel, characterized in that: The steps include: S1, separating a first group of stand sites and a second group of stand sites, wherein the second group of stand sites is arranged at the hull structure of the tail shaft section (2); S2, establishing a pre-assembly model of the tail shaft casting and the energy-saving guide wheel, and obtaining interference data between the guide vane (5) of the energy-saving guide wheel and the tail shaft casting (1); S3, marking a boundary line for margin cutting on the guide vane (5) according to the interference data, and performing margin-free cutting on the guide vane; S4, placing the tail shaft casting (1) on the first assembly position, and sealing the tail shaft casting (1); S5, pre-assembling the energy-saving guide wheel cut in step S3 onto the tail shaft casting (1), welding, and obtaining a first pre-assembly section; S6. Assemble the first pre-assembled segment onto the tail shaft segment (2).

2. The efficient installation method of the energy-saving guide wheel according to claim 1 is characterized in that: The first set of stand locations is configured to be adjacent to the second set of stand locations.

3. The efficient installation method of the energy-saving guide wheel according to claim 1 is characterized in that: In step S2, a pre-assembly model of the energy-saving guide wheel and tail shaft casting is established, including the following steps: Sa1, pre-assembling the tail shaft casting to the tail shaft section (2) hull structure; Sa2. Establishing a tail shaft casting model: Establishing the tail shaft casting model includes marking a plurality of first measuring points (3) on the outer contour surface of the tail shaft casting (1) using a total station, collecting data of the first measuring points (3), and then establishing the tail shaft casting model using CAD; Sa3, generating an energy-saving guide wheel design model: using a total station to mark a number of second measurement points on the guide wheel (4) and the guide vane (5) of the energy-saving guide wheel to generate an energy-saving guide wheel design model; Sa4, matching and connecting the tail shaft casting model and the energy-saving guide wheel design model, generating a tail shaft casting and energy-saving guide wheel pre-assembly model, and obtaining interference data; The interference data includes a mounting intersection line formed by connecting a plurality of interference points formed between the guide vane (5) of the energy-saving guide wheel and the tail shaft casting in the tail shaft casting and energy-saving guide wheel pre-assembly model, and the mounting intersection line is used as a boundary line for the margin cutting; the plurality of interference points are intersection points of the outer contour of the guide vane (5) and the contour surface of the tail shaft casting; Sa5. According to the interference data, an actual intersection line is drawn on the guide vane (5), and the excess of the guide vane is cut along the actual intersection line.

4. The efficient installation method of the energy-saving guide wheel according to claim 3 is characterized in that: In step S2, a plurality of the first measuring points (3) cover the outer contour surface of the tail shaft casting (1), the plurality of the first measuring points (3) are equidistant points, and the extension value of two adjacent first measuring points (3) is 100 to 200 mm.

5. The efficient installation method of the energy-saving guide wheel according to claim 3 is characterized in that: In step S4, the matching connection includes establishing a plurality of management points at a plurality of the second measuring points, and matching and connecting the management points with the first measuring points (3) by using the analysis function of the precision software ECO OTS.

6. The efficient installation method of the energy-saving guide wheel according to claim 3 is characterized in that: In step S4, before the matching connection, the precision software BLOCK is used to adjust the position of the tail shaft casting model to the theoretical design position of the tail shaft casting on the tail shaft segmented hull structure, and then the position of the energy-saving guide wheel design model is adjusted to the theoretical design position of the energy-saving guide wheel on the tail shaft casting.

7. The efficient installation method of the energy-saving guide wheel according to claim 5 is characterized in that: In step S2, the center point (12) on the tail end surface of the tail shaft casting is used as the intersection point, and the total station (16) is used to survey the intersection line (20) of the tail shaft casting and the cross section of the tail shaft casting, and the intersection line (21) of the tail shaft casting and the longitudinal section of the tail shaft casting; in step S3, the center of the guide wheel is used as the reference, and the total station (16) is used to survey the main reference line (7) on the guide wheel (4) of the energy-saving guide wheel. The main reference line (7) includes the intersection line (7a) of the guide wheel and the guide wheel cross section on the guide wheel (4), the intersection line (7b) of the guide wheel and the guide wheel longitudinal section on the guide wheel, and the intersection line (6) of the guide wheel and the guide wheel horizontal mid section on the guide wheel. The intersection point between the main reference lines (7) is used as the main reference line point (22), and the second measuring point has the main reference line point (22); in step S4, the cross section of the guide wheel and the cross section of the tail shaft casting are arranged on the same vertical plane.

8. The efficient installation method of the energy-saving guide wheel according to claim 6 is characterized in that: The first measuring point (3) includes a first measuring point on the intersection line (20) of the tail shaft casting and the cross section of the tail shaft casting and a first measuring point on the intersection line (21) of the tail shaft casting and the longitudinal section of the tail shaft casting. The first measuring point on the intersection line (20) of the tail shaft casting and the cross section of the tail shaft casting and the first measuring point on the intersection line (21) of the tail shaft casting and the longitudinal section of the tail shaft casting are marked on the tail shaft casting model. The theoretical design position of the energy-saving guide wheel pre-assembled on the tail shaft casting is at the same height as the main reference line point (22). When matched and connected, the main reference line point (22) is matched and connected with the first measuring point on the intersection line (20) of the tail shaft casting and the cross section of the tail shaft casting and the first measuring point on the intersection line (21) of the tail shaft casting and the longitudinal section of the tail shaft casting.

9. The efficient installation method of the energy-saving guide wheel according to claim 3 is characterized in that: The guide vane (5) is cut to the required size using a cutting torch.

10. The efficient installation method of energy-saving guide wheel according to claim 3 is characterized in that: The second measuring point on the guide vane (5) includes an intersection point (8) between the guide vane internal reinforcement structure and the guide vane curved plate.

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