A method for installing a water jet propulsion system

Abstract

The application relates to a water jet propeller mounting method, which comprises the following steps: pulling a line, detecting the machining allowance of a flange, detecting the mounting gap between the water jet propeller body and the inner wall of a base, making a boring reference point, mounting a boring row, checking the boring allowance, machining the flange, marking and drilling the base of the water jet propeller, mounting the water jet propeller and mounting a motor, and the like. The mounting precision is high, the mounting is simple, the center line of the water jet propeller is pulled, the step of finding the center of the water jet propeller cylinder is omitted, time and labor are saved.

Description

Technical Field

[0001] The present invention relates to the field of ships, and in particular to a method for installing a water jet propulsion system. Background Art

[0002] A waterjet propulsion system is a type of propulsion system in which the propulsion mechanism's jetting portion is submerged in water, using the reaction force generated by the jetting water to propel the vessel forward. A waterjet consists of a water pump, piping, a suction port, and a nozzle. The nozzle changes the direction of the water jet to maneuver the vessel. While less efficient than a propeller, it offers superior maneuverability, making it particularly adaptable to shallow waterways with muddy bottoms. However, current installation methods for marine waterjets suffer from low precision, cumbersome installation, and time-consuming and labor-intensive installation. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a method for installing a water propeller that is simple to install and has high precision in view of the above-mentioned existing technical status.

[0004] The technical solution adopted by the present invention to solve the above technical problems is: a method for installing a water jet propulsion device, characterized in that it includes the following steps:

[0005] S1. Using a total station, based on the data given in the drawings and with the ship's centerline as the reference, draw a line X1 on the waterjet base that is parallel to the center of the ship and extends to the motor base. Check the center of the motor base to ensure the motor is properly installed. Draw a line Y1 perpendicular to the ship's centerline and at a distance Y from the "0" rib. The intersection of the two lines is the center of the waterjet base.

[0006] S2. Build a wire draw frame on the upper surface of the waterjet base flange and the lower end of the cylinder. Hang a weight using O1, the intersection of parallel lines X1 and Y1 in the upper surface of the waterjet flange, as the reference point. The position of O1 corresponding to the wire draw frame at the lower end of the cylinder is point O2. Secure the ends of the music wire to O1 and O2 and secure them with an adjustment frame. Use a weight to tighten the music wire. Check the flange machining allowance and the installation clearance between the waterjet body and the inner wall of the base.

[0007] S3. Make boring reference points at about 150mm and 1200mm from the flange in the front, back, left and right directions. Measure and record the distances K1f, K1a, K1p, K1s, K2f, K2a, K2p, and K2s from each boring reference point to the piano wire.

[0008] S4. Weld four brackets evenly on the inner wall of the cylinder at a distance of 100 mm from the upper plane of the flange. Install a boring bar on the brackets and a sample rod on the boring bar. Measure the distances K1f", K1a", K1p", K1s", K2f", K2a", K2p", and K2s" from the reference points of each boring hole to the sample rod. When:

[0009] K1f-K1a=K1f"-K1a",

[0010] K1p-K1s=K1p"-K1s",

[0011] K2f-K2a=K2f"-K2a",

[0012] K2p-K2s=K2p"-K2s",

[0013] When , the boring calibration is qualified;

[0014] S5. Check the boring allowance. Rough-machine the upper surface of the flange first. When there is a 3mm allowance, semi-finish the upper surface of the flange. Measure the flatness of the upper surface of the flange. If the flatness is less than 0.5mm, you can proceed to fine machining. Ensure that the flange thickness is not less than 60mm, the height of the flange after machining is H, and the actual height of the upper surface of the flange from the lower end face of the cylinder is within the range of ±7mm of the predetermined height. Mark the pitch circle D1 of the bolt holes on the upper surface of the flange, machine the inner diameter of the flange, and then remove the boring bar and tooling.

[0015] S6. Take the intersection point a of line X1 and the pitch circle D1 at the bow as the reference, and use the compass and ruler method to find the back point b on the pitch circle, and then use the compass and ruler method to find the left point c and the right point d. Points a, c, b, and d are the four equally divided points on the pitch circle; take a, b, c, and d as the reference, and open two holes a1 and a2 at both ends of point a, with a distance L1 from the chord length of point a; open two holes b1 and b2 at both ends of point b, with a distance L1 from the chord length of point b; and open two holes b1 and b2 at both ends of point c, with a distance L1 from the chord length of point c. Open two holes c1 and c2 with a chord distance of L1, open two holes d1 and d2 at both ends of point d with a chord distance of L1, evenly open 8 holes with a chord distance of L2 between a1 and c1, evenly open 8 holes with a chord distance of L2 between a2 and d2, evenly open 8 holes with a chord distance of L2 between b1 and c2, and evenly open 8 holes with a chord distance of L2 between b2 and d1. A total of 40 holes are opened, the center point is punched, the cutting circle and the inspection circle are marked, and the holes are drilled with a magnetic drill;

[0016] S7. Extend the line connecting points a and b to the motor base. Install a magnetic meter base behind point b and in front of the base. Pull on the powder line and use a plumb bob to adjust the powder line until it coincides with the line connecting points a and b, and the vertical distance between the powder line and points c and d is equal.

[0017] S8. Check the thickness of the pad. Take point a as the reference point along the line ab and point e toward the motor base. The distance between points a and e is L3.

[0018] L3=LD / 2,

[0019] Wherein, L is the distance from the center of the waterjet cylinder to the first bolt hole of the motor, and D is the pitch circle diameter of the waterjet bolt hole;

[0020] Take point e as the reference, and take point f on the straight line ab in the direction of the motor. The distance between points e and f is L4, and L4 is the distance from the first bolt hole to the last bolt hole of the motor base. Use the ruler and compass drawing method to draw perpendicular lines Y2 and Y3 from points e and f on the straight line ab. Take points e and f as the reference, and intercept points g, h, i, and j along lines Y2 and Y3, so that the four lengths of the distance between points eg, the distance between points eh, the distance between points fi, and the distance between points fj are equal, and the distance between points gi is equal to the distance between points hj, and the distance between points gj is equal to the distance between points hi. Then g, h, i, and j are the center points of the four corner bolt holes of the motor; mark the cutting circle and the inspection circle, drill the holes, process and drill the welding pads, align and position the holes on the welding pads with the holes on the base, weld them, and match the upper surface of the pads;

[0021] S9. After the water jet propulsion base is processed and painted inside, the installation work is carried out. According to the information and drawings, the left and right directions are clearly distinguished, sealant is applied to the base, and a sealing gasket is installed. Guide pins are installed on the foot bolt holes of the water jet propulsion. The direction is corrected and the positioning pins are inserted into the holes. The positioning pins are removed and the bolts are installed and tightened according to the process requirements.

[0022] S10. Install the motor, fit the motor fixing pads, repaint the base, hoist the motor on the base, install the front, rear, left, right, top and bottom adjustment screws, install the coupling with the input flange of the water jet as the reference, the coupling connects the water jet and the motor, and measure the radial error of the coupling with a feeler gauge and a knife-edge gauge, the axial error of the coupling with an inside micrometer, and the angular error of the coupling with a dial indicator to center and align the coupling; measure the size of the movable pads, process and fit them, drill holes for the movable pads, tighten the base bolts, remeasure the calibration data to meet the requirements, install the elastic connector, and the installation is complete.

[0023] In order to detect the machining allowance of the flange, the method for detecting the machining allowance of the flange in S2 is: measuring the distances La1, La2, La3, La4, La5, La6, La7, and La8 from the piano wire at 8 points evenly distributed in the flange at the upper end of the waterjet propulsion seat. The inner diameter of the flange after machining is d. If the differences between La1, La2, La3, La4, La5, La6, La7, and La8 and d / 2 are greater than or equal to 3 mm, the machining requirements are met.

[0024] Furthermore, the method for detecting the flange machining allowance in S2 is: measuring the distances H1, H2, H3, H4, H5, H6, H7, and H8 from the corresponding points on the upper end surface of the flange to the bottom, where the height of the flange after machining is H, and the absolute value of the difference between H1, H2, H3, H4, H5, H6, H7, and H8 and the height H after machining of the flange is less than or equal to 7 mm.

[0025] In order to detect the installation gap between the waterjet propulsion body and the inner wall of the base, the method for detecting the installation gap between the waterjet propulsion body and the inner wall of the base in S2 is: respectively check the three sections b, c, and d of the upper, middle, and lower inner wall of the cylinder, and the distances Lb1, Lb2, Lb3, Lb4, Lb5, Lb6, Lb7, Lb8, Lc1, Lc2, Lc3, Lc4, Lc5, Lc6, Lc7, Lc8, Ld1, Ld2, Ld3, Ld4, Ld5, Ld6, Ld7, and Ld8 from the piano wire in eight directions: front, left front, right front, rear, left rear, right rear, left, and right. The difference between these distances and the radius of the waterjet propulsion cylinder is greater than or equal to 25 mm.

[0026] In order to check the boring allowance, the method for checking the boring allowance in S5 is as follows: two dial indicators with a range of 50 mm are installed on the boring bar, one is perpendicular to the upper plane of the flange, and the other is perpendicular to the inner diameter of the flange. The boring bar is rotated, and processing can be carried out when the runout of the dial indicator is 7 mm.

[0027] In order to check the thickness of the pad, in S8, the method for checking the thickness of the pad is:

[0028] Δδ=H11-H10-L5≥30mm;

[0029] Δδ=H12-H10-L5≥30mm;

[0030] Among them, Δδ is the sum of the thickness of the fixed pad and the movable pad, H11 is the distance from the powder line to the bow end of the motor base, H12 is the distance from the powder line to the stern end of the motor base, H10 is the vertical distance between the powder line and point c, and L5 is the distance between the flange plane and the bottom surface of the motor base.

[0031] Preferably, the radial error in S10 is ≤0.55 mm, the absolute value of the axial error is ≤0.5 mm, and the angular error is ≤0.09 mm / 100 mmxd.

[0032] Compared with the prior art, the advantages of the present invention are that the installation method of the water jet propulsion system includes the steps of pulling wires, detecting the machining allowance of the flange, detecting the installation gap between the water jet propulsion system body and the inner wall of the base, making a boring reference point, installing a boring row, checking the boring allowance, machining the flange, marking and drilling the water jet propulsion system base, installing the water jet propulsion system and installing the motor. The installation accuracy is high and the installation is simple. The steps of pulling the center line of the water jet propulsion system and finding the center of the water jet propulsion system cylinder are omitted, thus saving time and effort. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 Schematic diagram of the structure of measuring radial error using a feeler gauge and a knife-edge gauge in an embodiment of the present invention;

[0034] Figure 2 Schematic diagram of the structure of measuring axial error using an inside micrometer in an embodiment of the present invention;

[0035] Figure 3 Schematic diagram of the structure of measuring angle error using a dial indicator in an embodiment of the present invention. DETAILED DESCRIPTION

[0036] The present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

[0037] The installation method of the water jet propulsion device in this embodiment includes the following steps:

[0038] S1. Using a total station, based on the data given in the drawings and with the ship's centerline as the reference, draw a line X1 on the waterjet base that is parallel to the center of the ship and extends to the motor base. Check the center of the motor base to ensure the motor is properly installed. Draw a line Y1 perpendicular to the ship's centerline and at a distance Y from the "0" rib. The intersection of the two lines is the center of the waterjet base.

[0039] S2. Build a wire draw frame on the upper surface of the waterjet base flange and the lower end of the cylinder. Hang a weight using O1, the intersection of parallel lines X1 and Y1 in the upper surface of the waterjet flange, as the reference point. The position of O1 corresponding to the wire draw frame at the lower end of the cylinder is point O2. Secure the ends of the music wire to O1 and O2 and secure them with an adjustment frame. Use a weight to tighten the music wire. Check the flange machining allowance and the installation clearance between the waterjet body and the inner wall of the base.

[0040] The purpose of pulling the wire is to check whether the position of the water jet propulsion base is correct, the dimensions of each part meet the processing requirements, ensure that the water jet propulsion can be installed correctly and meet the installation requirements, and the motor seat meets the installation requirements;

[0041] Among them, the method for detecting the flange processing allowance in S2 is: measuring the distances La1, La2, La3, La4, La5, La6, La7, and La8 from the piano wire to 8 points evenly distributed in the flange at the upper end of the water jet propulsion seat. The inner diameter of the flange after processing is d. If the differences between La1, La2, La3, La4, La5, La6, La7, and La8 and d / 2 are greater than or equal to 3 mm, the processing requirements are met.

[0042] The method for detecting the flange machining allowance in S2 is: measure the distance H1, H2, H3, H4, H5, H6, H7, H8 from the corresponding point on the upper end surface of the flange to the bottom, the height of the flange after machining is H, and the absolute value of the difference between H1, H2, H3, H4, H5, H6, H7, H8 and the height H after flange machining is less than or equal to 7 mm.

[0043] The processing allowance of the panel is 10mm, and the minimum thickness of the board is 60mm, which can ensure that 1-3 threads are exposed after the bolts are installed. The maximum thickness of the board cannot exceed 65mm.

[0044] The method for testing the installation clearance between the waterjet body and the inner wall of the base in S2 is to respectively check the distances Lb1, Lb2, Lb3, Lb4, Lb5, Lb6, Lb7, Lb8, Lc1, Lc2, Lc3, Lc4, Lc5, Lc6, Lc7, Lc8, Ld1, Ld2, Ld3, Ld4, Ld5, Ld6, Ld7, and Ld8 from the music wire in eight directions: front, left front, right front, rear, left rear, right rear, left, and right. The difference between these distances and the radius of the waterjet body must be greater than or equal to 25 mm. 25 mm is the minimum clearance between the waterjet body and the inner wall of the base after installation.

[0045] S3. Make boring reference points at about 150mm and 1200mm from the flange in the front, back, left and right directions. Measure and record the distances K1f, K1a, K1p, K1s, K2f, K2a, K2p, and K2s from each boring reference point to the piano wire.

[0046] S4. Weld four brackets evenly on the inner wall of the cylinder at a distance of 100 mm from the upper plane of the flange. Install a boring bar on the brackets and a sample rod on the boring bar. Measure the distances K1f", K1a", K1p", K1s", K2f", K2a", K2p", and K2s" from the reference points of each boring hole to the sample rod. When:

[0047] K1f-K1a=K1f"-K1a",

[0048] K1p-K1s=K1p"-K1s",

[0049] K2f-K2a=K2f"-K2a",

[0050] K2p-K2s=K2p"-K2s",

[0051] When , the boring calibration is qualified;

[0052] S5. Check the boring allowance. Rough-machine the upper surface of the flange first. When there is a 3mm allowance, semi-finish the upper surface of the flange. Measure the flatness of the upper surface of the flange. If the flatness is less than 0.5mm, you can proceed to fine machining. Ensure that the flange thickness is not less than 60mm, the height of the flange after machining is H, and the actual height of the upper surface of the flange from the lower end face of the cylinder is within the range of ±7mm of the predetermined height. Mark the pitch circle D1 of the bolt holes on the upper surface of the flange, machine the inner diameter of the flange, and then remove the boring bar and tooling.

[0053] Among them, the method for checking the boring allowance in S5 is: install two dial indicators with a range of 50mm on the boring bar, one perpendicular to the upper plane of the flange, and the other perpendicular to the inner diameter of the flange. Rotate the boring bar, and the processing work can be carried out when the runout of the dial indicator is 7mm.

[0054] Since this base has 40 holes, if the traditional method of calculating the chord length is used to select points one by one, an error of 0.2mm in one hole will result in an error of 8mm in the end, making it impossible to install.

[0055] S6. Take the intersection point a of line X1 and the pitch circle D1 at the bow as the reference, and use the compass and ruler method to find the back point b on the pitch circle, and then use the compass and ruler method to find the left point c and the right point d. Points a, c, b, and d are the four equally divided points on the pitch circle; take a, b, c, and d as the reference, open two holes a1 and a2 at both ends of point a, with the chord length distance L1 from point a, open two holes b1 and b2 at both ends of point b, with the chord length distance L1 from point b, and open two holes c1 and c2 at both ends of point c, with the chord length distance L1 from point c. Open two holes, d1 and d2, with a chord length distance L1 at both ends of point d, evenly open 8 holes with a chord length distance L2 between a1 and c1, evenly open 8 holes with a chord length distance L2 between a2 and d2, evenly open 8 holes with a chord length distance L2 between b1 and c2, evenly open 8 holes with a chord length distance L2 between b2 and d1, a total of 40 holes, punch the center point, mark the cutting circle and inspection circle, and drill the holes with a magnetic drill; this way, the error of each hole can be guaranteed to be within 1mm, ensuring normal installation;

[0056] S7. Extend the line connecting points a and b to the motor base. Since the flange upper surface and the motor base are not in the same plane and are blocked by a flat iron barrier, set up a magnetic meter base behind point b and in front of the base. Pull on the powder line and use a plumb bob to adjust the powder line until it coincides with the line connecting points a and b, and the vertical distance between the powder line and points c and d is equal.

[0057] S8. Check the thickness of the pad. Take point a as the reference point along the line ab and point e toward the motor base. The distance between points a and e is L3.

[0058] L3=LD / 2,

[0059] Wherein, L is the distance from the center of the waterjet cylinder to the first bolt hole of the motor, and D is the pitch circle diameter of the waterjet bolt hole;

[0060] By converting and measuring from point a as the reference point, the process of drawing the center line of the water jet propulsion system and finding the center of the water jet propulsion system cylinder is omitted, which saves time and effort.

[0061] Take point e as the reference, and take point f on the straight line ab in the direction of the motor. The distance between points e and f is L4, and L4 is the distance from the first bolt hole to the last bolt hole of the motor base. Use the ruler and compass drawing method to draw perpendicular lines Y2 and Y3 from points e and f on the straight line ab. Take points e and f as the reference, and intercept points g, h, i, and j along lines Y2 and Y3, so that the four lengths of the distance between points eg, the distance between points eh, the distance between points fi, and the distance between points fj are equal, and the distance between points gi is equal to the distance between points hj, and the distance between points gj is equal to the distance between points hi. Then g, h, i, and j are the center points of the four corner bolt holes of the motor; mark the cutting circle and the inspection circle, drill the holes, process and drill the welding pads, align and position the holes on the welding pads with the holes on the base, weld them, and match the upper surface of the pads;

[0062] Among them, in S8, the method for checking the thickness of the pad is:

[0063] Δδ=H11-H10-L5≥30mm;

[0064] Δδ=H12-H10-L5≥30mm;

[0065] Among them, Δδ is the sum of the thickness of the fixed pad and the movable pad, H11 is the distance from the powder line to the bow end of the motor base, H12 is the distance from the powder line to the stern end of the motor base, H10 is the vertical distance between the powder line and point c, and L5 is the distance between the flange plane and the bottom surface of the motor base.

[0066] S9. After the water jet propulsion base is processed and painted inside, the installation work is carried out. According to the information and drawings, the left and right directions are clearly distinguished, sealant is applied to the base, and a sealing gasket is installed. Guide pins are installed on the foot bolt holes of the water jet propulsion. The direction is corrected and the positioning pins are inserted into the holes. The positioning pins are removed and the bolts are installed and tightened according to the process requirements.

[0067] S10, install the motor 1, match the motor 1 fixing pad, repaint the base, hoist the motor 1 on the base, install the front, rear, left, right, up and down adjustment screws, install the coupling with the input flange of the water jet propulsion unit 2 as the reference, the coupling connects the water jet propulsion unit 2 and the motor 1, and use the feeler gauge 3 and the knife edge gauge 4 to measure the radial error of the coupling (such as Figure 1 ), use the inside micrometer 5 to measure the axial error of the coupling (such as Figure 2 ), use dial indicator 6 to measure the angular error of the coupling (such as Figure 3 ) to center and align the coupling; measure the size of the movable pad, process and match it, drill the movable pad, tighten the base bolts, remeasure the centering data to meet the requirements, install the elastic connector, and the installation is complete.

[0068] Among them, the radial error is ≤0.55mm, the absolute value of the axial error is ≤0.5mm, and the angular error is ≤0.09mm / 100mmxd.

Claims

1. A method for installing a water jet propulsion system, characterized in that: The following steps are involved: S1. Using a total station, based on the data given in the drawings and with the ship's centerline as the reference, draw a line X1 on the waterjet base, parallel to the center of the ship and extending it to the motor base. Check the center of the motor base to ensure the motor is properly installed. Draw a line Y1 perpendicular to the ship's centerline and at a distance Y from the "0" rib. The intersection of the two lines is the center of the waterjet base. S2. Build a wire draw frame on the upper surface of the waterjet base flange and the lower end of the cylinder. Hang a weight using O1, the intersection of lines X1 and Y1 in the upper surface of the waterjet flange, as the reference point. The position of O1 corresponding to the wire draw frame at the lower end of the cylinder is point O2. Secure the ends of the music wire to O1 and O2 and secure them with an adjustment frame. Use a weight to tighten the music wire. Check the flange machining allowance and the installation clearance between the waterjet body and the inner wall of the base. S3. Make boring reference points at about 150mm and 1200mm from the flange in the front, back, left and right directions. Measure and record the distances K1f, K1a, K1p, K1s, K2f, K2a, K2p, and K2s from each boring reference point to the piano wire. S4. Weld four brackets evenly on the inner wall of the cylinder at a distance of 100 mm from the upper plane of the flange. Install a boring bar on the brackets and a sample rod on the boring bar. Measure the distances K1f", K1a", K1p", K1s", K2f", K2a", K2p", and K2s" from the reference points of each boring hole to the sample rod. When: K1f-K1a=K1f"-K1a", K1p-K1s=K1p"-K1s", K2f-K2a=K2f"-K2a", K2p-K2s=K2p"-K2s", When , the boring calibration is qualified; S5. Check the boring allowance. Rough-machine the upper surface of the flange first. When there is a 3mm allowance, semi-finish the upper surface of the flange. Measure the flatness of the upper surface of the flange. If the flatness is less than 0.5mm, you can proceed to fine machining. Ensure that the flange thickness is not less than 60mm, the height of the flange after machining is H, and the actual height of the upper surface of the flange from the lower end face of the cylinder is within the range of ±7mm of the predetermined height. Mark the pitch circle D1 of the bolt holes on the upper surface of the flange, machine the inner diameter of the flange, and then remove the boring bar and tooling. S6. Take the intersection point a of line X1 and the pitch circle D1 at the bow as the reference, and use the compass and ruler method to find the back point b on the pitch circle, and then use the compass and ruler method to find the left point c and the right point d. Points a, c, b, and d are the four equally divided points on the pitch circle; take a, b, c, and d as the reference, and open two holes a1 and a2 at both ends of point a, with a distance L1 from the chord length of point a; open two holes b1 and b2 at both ends of point b, with a distance L1 from the chord length of point b; and open two holes b1 and b2 at both ends of point c, with a distance L1 from the chord length of point c. Open two holes c1 and c2 with a chord distance of L1, open two holes d1 and d2 at both ends of point d with a chord distance of L1, evenly open 8 holes with a chord distance of L2 between a1 and c1, evenly open 8 holes with a chord distance of L2 between a2 and d2, evenly open 8 holes with a chord distance of L2 between b1 and c2, and evenly open 8 holes with a chord distance of L2 between b2 and d1. A total of 40 holes are opened, the center point is punched, the cutting circle and the inspection circle are marked, and the holes are drilled with a magnetic drill; S7. Extend the line connecting points a and b to the motor base. Install a magnetic meter base behind point b and in front of the base. Pull on the powder line and use a plumb bob to adjust the powder line until it coincides with the line connecting points a and b, and the vertical distance between the powder line and points c and d is equal. S8. Check the thickness of the pad. Take point a as the reference point along the line ab and point e toward the motor base. The distance between points a and e is L3. L3=LD / 2, Wherein, L is the distance from the center of the waterjet cylinder to the first bolt hole of the motor, and D is the pitch circle diameter of the waterjet bolt hole; Take point e as the reference, and take point f on the straight line ab in the direction of the motor. The distance between points e and f is L4, and L4 is the distance from the first bolt hole to the last bolt hole of the motor base. Use the ruler and compass drawing method to draw perpendicular lines Y2 and Y3 from points e and f on the straight line ab. Take points e and f as the reference, and intercept points g, h, i, and j along lines Y2 and Y3, so that the four lengths of the distance between points eg, the distance between points eh, the distance between points fi, and the distance between points fj are equal, and the distance between points gi is equal to the distance between points hj, and the distance between points gj is equal to the distance between points hi. Then g, h, i, and j are the center points of the four corner bolt holes of the motor; mark the cutting circle and the inspection circle, drill the holes, process and drill the welding pads, align and position the holes on the welding pads with the holes on the base, weld them, and match the upper surface of the pads; S9. After the water jet propulsion base is processed and painted inside, the installation work is carried out. According to the information and drawings, the left and right directions are clearly distinguished, sealant is applied to the base, and a sealing gasket is installed. Guide pins are installed on the foot bolt holes of the water jet propulsion. The direction is corrected and the positioning pins are inserted into the holes. The positioning pins are removed and the bolts are installed and tightened according to the process requirements. S10. Install the motor, fit the motor fixing pads, repaint the base, hoist the motor on the base, install the front, rear, left, right, top and bottom adjustment screws, install the coupling with the input flange of the water jet as the reference, the coupling connects the water jet and the motor, and measure the radial error of the coupling with a feeler gauge and a knife-edge gauge, the axial error of the coupling with an inside micrometer, and the angular error of the coupling with a dial indicator to center and align the coupling; measure the size of the movable pads, process and fit them, drill holes for the movable pads, tighten the base bolts, remeasure the calibration data to meet the requirements, install the elastic connector, and the installation is complete.

2. The method for installing a water jet according to claim 1, wherein: The method for detecting the flange machining allowance in S2 is: measuring the distances La1, La2, La3, La4, La5, La6, La7, and La8 from the piano wire to 8 points evenly distributed in the flange at the upper end of the water jet propulsion seat. The inner diameter of the flange after machining is d. If the differences between La1, La2, La3, La4, La5, La6, La7, and La8 and d / 2 are greater than or equal to 3 mm, the machining requirements are met.

3. The method for installing a water jet according to claim 2, wherein: The method for detecting the flange machining allowance in S2 is: measuring the distances H1, H2, H3, H4, H5, H6, H7, H8 from the corresponding points on the upper end surface of the flange to the bottom, where the height of the flange after machining is H, and the absolute value of the difference between H1, H2, H3, H4, H5, H6, H7, H8 and the height H after machining of the flange is less than or equal to 7 mm.

4. The method for installing a water jet according to claim 1, wherein: The method for detecting the installation gap between the water jet propulsion body and the inner wall of the base in the said S2 is: respectively check the three sections b, c, and d of the upper, middle, and lower inner wall of the cylinder, and the distances Lb1, Lb2, Lb3, Lb4, Lb5, Lb6, Lb7, Lb8, Lc1, Lc2, Lc3, Lc4, Lc5, Lc6, Lc7, Lc8, Ld1, Ld2, Ld3, Ld4, Ld5, Ld6, Ld7, and Ld8 from the piano wire in eight directions: front, left front, right front, rear, left rear, right rear, left, and right. The difference between these distances and the radius of the water jet propulsion cylinder is greater than or equal to 25 mm.

5. The method for installing a water jet according to claim 1, wherein: The method for checking the boring allowance in S5 is as follows: two dial indicators with a range of 50 mm are installed on the boring bar, one is perpendicular to the upper plane of the flange, and the other is perpendicular to the inner diameter of the flange. The boring bar is rotated, and processing can be carried out when the runout of the dial indicator is 7 mm.

6. The method for installing a water jet according to claim 1, wherein: In S8, the method for checking the thickness of the pad is: Δδ=H11-H10-L5≥30mm; Δδ=H12-H10-L5≥30mm; Among them, Δδ is the sum of the thickness of the fixed pad and the movable pad, H11 is the distance from the powder line to the bow end of the motor base, H12 is the distance from the powder line to the stern end of the motor base, H10 is the vertical distance between the powder line and point c, and L5 is the distance between the flange plane and the bottom surface of the motor base.

7. The method for installing a water jet according to claim 1, wherein: The radial error in S10 is ≤0.55 mm, the absolute value of the axial error is ≤0.5 mm, and the angular error is ≤0.09 mm / 100 mmxd.

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