Marine diesel engine high pressure oil pipe assembly elbow clamp assembly and elbow method

Abstract

The application discloses a kind of marine diesel engine high-pressure oil pipe assembly elbow clamp assembly and elbow pipe method, clamp assembly includes first 90 elbow clamp and secondary 170 elbow clamp, first 90 elbow clamp includes first mesa panel assembly welding, high-pressure oil pipe assembly end head limiting assembly, 2 interval setting straight pipe portion vertical clamping assembly, bending roller assembly and 90 bending positioning assembly.Secondary 170 elbow clamp includes second mesa panel assembly welding, 90 bending portion horizontal clamping assembly, straight pipe portion horizontal clamping assembly, bending roller assembly and 170 bending positioning assembly.Elbow pipe method includes 1) first 90 elbow pipe, 2) secondary 170 elbow pipe forming.The application is operated time-saving and labor-saving, ensures that the space size of high-pressure oil pipe group inlet and outlet has higher position precision.Obvious improvement is made to the elbow pipe quality of high-pressure oil pipe assembly, reduces the processing cost of high-pressure oil pipe assembly, and solves the twice bending problem of high-pressure oil pipe assembly.

Description

Technical Field

[0001] This invention relates to a bending fixture for metal pipes, and more particularly to a fixture and method for a high-pressure oil pipe assembly formed by two bending operations with two mutually perpendicular in-plane angles, belonging to the field of metal pipe plastic deformation processing technology. Background Technology

[0002] The high-pressure fuel line assembly is an important component of marine diesel engines. Its quality directly affects the overall performance and service life of the marine diesel engine. Its function is to effectively provide high-pressure fuel with a pressure of over 150 MPa to the cylinder. One end is connected to the high-pressure injection pump through a pipe fitting nut, and the other end is connected to the fuel injector through a pipe fitting nut. It must not leak fuel when it is working properly.

[0003] 300 high-pressure oil pipe assembly for a certain type of marine medium-speed diesel engine Figure 1 and Figure 2 As shown, it is a three-layer assembly with a 90° bending angle in the X0Z plane and a 170° bending angle in the X0Y plane of the three-dimensional coordinate system. The inner layer of the high-pressure oil pipe assembly 300 is a high-pressure oil pipe 10 made of 16Mn low-alloy steel, the middle layer consists of two open liner pipes 20 with opposite opening directions, and the outer layer is a sheath pipe 30. Both the open liner pipes 20 and the sheath pipe 30 are made of high-quality low-carbon steel. Currently, high-pressure oil pipe assemblies are bent using a press with a conventional mold. The oil pipe has high deformation resistance, is difficult to bend, and is prone to collapsing and losing roundness at the bend. It is also impossible to achieve precise bending angles in both planes. It is necessary to develop a special mold and bending method for bending high-pressure oil pipe assemblies twice to overcome this problem. Summary of the Invention

[0004] The purpose of this invention is to provide a bending clamp assembly and bending method for a high-pressure oil pipe assembly for marine diesel engines, which can bend the high-pressure oil pipe assembly at different angles in the vertical and horizontal planes in three-dimensional space, thereby improving the spatial position accuracy of the inlet and outlet of the high-pressure oil pipe assembly.

[0005] This invention is achieved through the following technical solution:

[0006] A high-pressure oil pipe assembly bending clamp assembly for marine diesel engines includes a primary 90° bending clamp and a secondary 170° bending clamp. The primary 90° bending clamp includes a first panel assembly, a high-pressure oil pipe assembly end-limiting assembly, two spaced-apart vertical clamping assemblies for the straight pipe section, a bending roller assembly, and a 90° bending positioning assembly. The secondary 170° bending clamp includes a second panel assembly, a 90° bending section horizontal clamping assembly, a straight pipe section horizontal clamping assembly, a bending roller assembly, and a 170° bending positioning assembly. The high-pressure oil pipe assembly end-limiting assembly is fixed to one end of the first panel assembly, and the vertical clamping assembly for the straight pipe section... The components are fixed at intervals on the middle of the first panel assembly weldment, and the central axis of the high-pressure oil pipe assembly end limiting assembly matches the central axis of the straight pipe section vertical clamping assembly; the bending roller assembly is set on the other end of the first panel assembly weldment, and the 90° bending positioning assembly is obliquely placed on the corner of the other end of the first panel assembly weldment; the 90° bending section horizontal clamping assembly is fixed on one corner of the second panel assembly weldment, the bending roller assembly is set on the middle of one side of the second panel assembly weldment, the straight pipe section horizontal clamping assembly is located between the 90° bending section horizontal clamping assembly and the bending roller assembly, and the 170° bending positioning assembly is obliquely placed on the middle of the other side of the second panel assembly weldment.

[0007] The objectives of this invention can also be further achieved through the following technical measures.

[0008] Furthermore, the high-pressure oil pipe assembly end limiting component, the 90° bending positioning component, and the 170° bending positioning component have the same structure, each including a vertically arranged high-pressure oil pipe assembly end limiting fixing block, a 90° bending positioning fixing block, and a 170° bending positioning fixing block, as well as horizontally fixed at the center of the high-pressure oil pipe assembly end limiting fixing block, the center of the 90° bending positioning fixing block, and the center of the 170° bending positioning fixing block, respectively, and fixing nuts screwed onto the horizontally fixed screws and clamping the two sides of the corresponding fixing blocks; the high-pressure oil pipe assembly end limiting fixing block and the 90° bending positioning fixing block are respectively fixed at the corresponding positions of the first panel assembly weldment, and the 170° bending positioning fixing block is fixed at the corresponding position of the second panel assembly weldment.

[0009] Furthermore, the vertical clamping assembly for the straight pipe section includes a straight pipe section support block and a top cover. The bottom of the straight pipe section support block is fixed at intervals on the middle of the first panel assembly weldment. The lower side of the straight pipe section of the high-pressure oil pipe assembly is supported on the upper part of the straight pipe section support block. The top cover presses on the high-pressure oil pipe assembly. Both ends of the top cover are fixedly connected to the straight pipe section support block by vertical fastening screws.

[0010] Furthermore, the bending roller assembly includes a fork-shaped rocker arm, a fork-shaped pressure plate, a bushing, a first vertical shaft, a second vertical shaft, an adjusting screw, and two horizontal bending wheels. The bushing is fixed to the upper side of one end of the fork-shaped rocker arm. The fork-shaped pressure plate is embedded in the open end of the fork-shaped rocker arm. The first vertical shaft passes through the bushing on the upper side of one end of the fork-shaped rocker arm, a horizontal bending wheel, and the lower side of one end of the fork-shaped rocker arm and either the first or second panel assembly weldment, respectively, through nuts. The upper and lower ends of the first vertical shaft are respectively fixed to the first or second panel assembly weldment by nuts. The second vertical shaft passes through the middle of the fork-shaped rocker arm, the fork-shaped pressure plate, and another horizontal bending wheel in the open end of the fork-shaped pressure plate, through the middle of the fork-shaped rocker arm, the fork-shaped pressure plate, and the open end of the fork-shaped pressure plate, through an upper nut. The second vertical shaft and the other horizontal bending wheel are supported in the fork-shaped pressure plate by an upper nut. One end of the adjusting screw is screwed into the closed end of the fork-shaped rocker arm, and the other end of the adjusting screw is screwed into the closed end of the fork-shaped rocker arm and then extends into the closed end of the fork-shaped pressure plate.

[0011] Furthermore, the second vertical shaft passes through the oval holes on the upper and lower sides of the middle part of the fork-shaped rocker arm, and the center distance A of the oval holes is 8 to 12 mm.

[0012] Furthermore, a handle is welded to the lower side of the closed end of the fork-shaped rocker arm. The radial arc groove diameter D of the horizontal curved wheel matches the outer diameter d of the high-pressure oil pipe assembly.

[0013] Furthermore, the 90° bend horizontal clamping assembly includes a 90° bend module and a bend horizontal clamping block. The upper vertical tube of the 90° bend of the high-pressure oil pipe assembly is embedded in the upper part of the 90° bend module. The bottom of the 90° bend module is fixed to the second panel assembly. The bend horizontal clamping block, with both ends fixed to the upper part of the vertical side of the 90° bend module, clamps the upper vertical tube of the 90° bend of the high-pressure oil pipe assembly. The straight pipe horizontal clamping assembly includes a straight pipe module and a horizontal clamping block. The bottom of the straight pipe module is fixed to the second panel assembly. The lower horizontal tube of the 90° bend of the high-pressure oil pipe assembly is embedded in the upper part of the straight pipe module. The horizontal clamping block, with both ends vertically fixed to the upper part of the straight pipe module, clamps the lower horizontal tube of the 90° bend of the high-pressure oil pipe assembly.

[0014] A bending method for a high-pressure oil pipe assembly bending clamp for marine diesel engines includes the following steps:

[0015] 1) First 90° pipe bend

[0016] 1.1) First, fix the assembled first 90° pipe bending fixture on the workbench, then rotate the fork-shaped rocker arm counterclockwise to the initial position where the center line of the fork-shaped rocker arm is perpendicular to the center line of the two straight pipe support blocks, thus completing the preparation before the first 90° pipe bending.

[0017] 1.2) Pass one end of the assembled straight high-pressure oil pipe assembly through the radial arc grooves of the two horizontal bending wheels inside the fork-shaped rocker arm and the upper side of the two straight pipe support blocks in sequence until the end of the straight high-pressure oil pipe assembly abuts against the end of the horizontal positioning screw of the high-pressure oil pipe assembly end limit assembly; then fix the upper cover to the straight pipe support block to clamp the straight high-pressure oil pipe assembly, and then tighten the adjusting screw. One end of the adjusting screw pushes the adjusting fork-shaped pressure plate, the second vertical shaft and the horizontal bending wheel in the middle of the second vertical shaft to move along the oval holes on the upper and lower sides of the middle of the fork-shaped rocker arm toward the adjacent straight pipe vertical clamping assembly until the radial arc grooves of the two horizontal bending wheels clamp the straight high-pressure oil pipe assembly and cannot move, thus completing the preparation for the first 90° bend of the straight high-pressure oil pipe assembly;

[0018] 1.3) The operator holds the handle on the lower side of the closed end of the fork-shaped rocker arm and rotates it clockwise around the axis of the first vertical shaft until one side of the fork-shaped rocker arm abuts against the end of the horizontal positioning screw of the 90° bending positioning component. At this time, one end of the high-pressure oil pipe assembly completes its first bend under the rolling action of the horizontal bending wheel on the second vertical shaft, with a bending angle of 90° + the first springback angle α determined by the trial bend. The first springback angle α of the high-pressure oil pipe assembly's first 90° bend is adjusted by adjusting the extension length of the horizontal positioning screw of the 90° bending positioning component.

[0019] When removing the high-pressure oil pipe assembly that has completed its first 90° bend, first loosen the adjusting screw, then pull the second vertical shaft towards the handle to increase the center distance between the two horizontal bending wheels. The 90° bend of the high-pressure oil pipe assembly will be released from its constraint. After removing the top cover fixed to the straight pipe support block, the high-pressure oil pipe assembly that has completed its first 90° bend can be taken out.

[0020] 2) Secondary 170° pipe bending forming

[0021] 2.1) First, fix the assembled secondary 170° pipe bending fixture on the workbench, then rotate the fork-shaped rocker arm counterclockwise until the center line of the fork-shaped rocker arm is perpendicular to the center line of the horizontal clamping assembly of the straight pipe section, thus completing the preparation before the secondary 170° pipe bending.

[0022] 2.2) The vertical tube at the upper end of the 90° bend of the high-pressure oil pipe assembly, which has already completed its first 90° bend, is embedded in the upper part of the 90° bend module. The horizontal tube at the lower end of the 90° bend of the high-pressure oil pipe assembly is first embedded in the upper part of the straight pipe module, and then passes through the radial arc grooves between the two horizontal bending wheels inside the fork-shaped rocker arm. The horizontal clamping block of the bend is then fixed on one side of the upper part of the 90° bend module, and the horizontal clamping block is fixed on one side of the upper part of the straight pipe module. Next, the adjusting screw is tightened, and the fork-shaped pressure plate, the second vertical shaft, and the horizontal bending wheel in the middle of the second vertical shaft are pushed to move along the oval holes on the upper and lower sides of the middle of the fork-shaped rocker arm toward the adjacent horizontal clamping assembly of the straight pipe section, until the radial arc grooves of the two horizontal bending wheels clamp the horizontal tube at the lower end of the 90° bend of the high-pressure oil pipe assembly and cannot move. This fixes the high-pressure oil pipe assembly, which has already completed its first 90° bend, in the 90° bend module assembly and the straight pipe module assembly, completing the preparation for the second 170° bend of the high-pressure oil pipe assembly.

[0023] 2.3) The operator holds the handle on the lower side of the closed end of the fork-shaped rocker arm and rotates it clockwise around the first vertical axis until one side of the fork-shaped rocker arm abuts against the end of the horizontal positioning screw of the 170° bending positioning component. At this time, the other end of the high-pressure oil pipe assembly completes a secondary bend under the rolling action of the horizontal bending wheel on the second vertical axis. The bending angle is 170° + the second spring angle β determined by the trial bend. The second spring angle β of the secondary 170° bend determined by the trial bend is adjusted by adjusting the extension length of the horizontal positioning screw of the 170° bending positioning component.

[0024] When removing the high-pressure oil pipe assembly that has completed the second 170° bend, first loosen the adjusting screw, then pull the second vertical shaft towards the handle to increase the center distance between the two horizontal bending wheels. This releases the constraint on the 170° bend of the high-pressure oil pipe assembly. After removing the horizontal clamping block fixed to the upper part of the bending module and the horizontal clamping block fixed to the upper part of the straight pipe module, the high-pressure oil pipe assembly that has completed the second 170° bend can be taken out.

[0025] The present invention employs a fork-shaped pressure plate, a fork-shaped rocker arm, and two horizontal bending wheels for both the initial 90° bend and the secondary 170° bend. One horizontal bending wheel serves as the central wheel, and the other as a satellite wheel that both rotates and revolves around the central wheel. Using only manual labor, the lever torque amplified by the fork-shaped rocker arm and handle, along with the rotation and revolution of the satellite bending wheel, causes plastic deformation of the high-pressure oil pipe assembly under the high bending stress at line contact. Through continuous operation of the two sets of bending clamps, the initial 90° bend and the secondary 170° bend of the high-pressure oil pipe assembly can be completed. This operation is time-saving and labor-saving, prevents the high-pressure oil pipe assembly from collapsing and becoming out of round, and ensures high positional accuracy of the spatial dimensions of the high-pressure oil pipe assembly's inlet and outlet. The present invention significantly improves the bending quality of the high-pressure oil pipe assembly, reduces its processing cost, and overcomes the challenge of two-stage bending of the high-pressure oil pipe assembly.

[0026] The advantages and features of the present invention will be illustrated and explained by the following non-limiting description of preferred embodiments, which are given by way of example only with reference to the accompanying drawings. Attached Figure Description

[0027] Figure 1 This is the front view of the finished high-pressure oil pipe assembly;

[0028] Figure 2 yes Figure 1 Top view;

[0029] Figure 3 This is the front view of the 90° pipe bending clamp;

[0030] Figure 4 yes Figure 3 Top view;

[0031] Figure 5 This is the front view of the 170° pipe bending clamp;

[0032] Figure 6 yes Figure 5 Top view. Detailed Implementation

[0033] The present invention will be further described below with reference to the accompanying drawings and embodiments of the high-pressure oil pipe assembly for marine medium-speed diesel engines.

[0034] In the description of this invention, terms such as "upper," "lower," "left," "right," "inner," and "outer" that indicate orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and do not indicate or imply that the device referred to must have a specific orientation.

[0035] like Figures 3-6As shown, this embodiment includes a primary 90° pipe bending clamp 100 and a secondary 170° pipe bending clamp 200. The primary 90° pipe bending clamp 100 includes a first panel assembly weldment 1, a high-pressure oil pipe assembly end limiting component 2, two spaced-apart straight pipe section vertical clamping components 3, a bending roller assembly 4, and a 90° bending positioning component 5. The high-pressure oil pipe assembly end limiting component 2 is fixed to the left end of the first panel assembly weldment 1, and the straight pipe section vertical clamping components 3 are spaced-apart and fixed to the middle of the first panel assembly weldment 1, with the central axis of the high-pressure oil pipe assembly end limiting component 2 matching the central axis of the straight pipe section vertical clamping components 3. The bending roller assembly 4 is located on the right end of the first panel assembly weldment 1, and the 90° bending positioning component 5 is as follows: Figure 4 It is shown as being placed obliquely on the lower right corner of the first panel assembly 1.

[0036] The secondary 170° pipe bending fixture 200 includes a second panel assembly 6, a 90° bend horizontal clamping assembly 7, a straight pipe horizontal clamping assembly 8, a bending roller assembly 4, and a 170° bend positioning assembly 9. The 90° bend horizontal clamping assembly 7 is fixed to, for example, Figure 6 On the upper left corner of the second panel assembly 6 shown, the bending roller assembly 4 is located on the middle of one side of the second panel assembly 6, the straight pipe horizontal clamping assembly 8 is located between the 90° bending section horizontal clamping assembly 7 and the bending roller assembly 4, and the 170° bending positioning assembly 9 is obliquely placed on the middle of the other side of the second panel assembly 6.

[0037] The high-pressure oil pipe assembly end limiting component 2, the 90° bending positioning component 5, and the 170° bending positioning component 9 have the same structure. They each include a vertically arranged high-pressure oil pipe assembly end limiting fixing block 21, a 90° bending positioning fixing block 51, and a 170° bending positioning fixing block 91, and horizontally fixed at the centers of the high-pressure oil pipe assembly end limiting fixing block 21, the 90° bending positioning fixing block 51, and the 170° bending positioning fixing block 91, respectively. They also include fixing nuts 23 screwed onto the horizontal fixing screws 22 and clamping the corresponding fixing blocks on both sides. The high-pressure oil pipe assembly end limiting fixing block 21 and the 90° bending positioning fixing block 51 are fixed at their respective positions on the first panel assembly weldment 1, and the 170° bending positioning fixing block 91 is fixed at its corresponding position on the second panel assembly weldment 6.

[0038] The vertical clamping assembly 3 for the straight pipe section includes a straight pipe section support block 31 and an upper cover 32. The bottom of the straight pipe section support block 31 is fixed at intervals on the middle of the first panel assembly 1. The lower side of the straight pipe section 301 of the high-pressure oil pipe assembly 300 is supported on the upper part of the straight pipe section support block 31. The upper cover 32 is pressed on the high-pressure oil pipe assembly 300. Both ends of the upper cover 32 are fixedly connected to the straight pipe section support block 31 by vertical fastening screws 33.

[0039] The bending roller assembly 4 includes a fork-shaped rocker arm 41, a fork-shaped pressure plate 42, a bushing 43, a first vertical shaft 44, a second vertical shaft 45, an adjusting screw 46, and two horizontal bending wheels 47. The bushing 43 is fixed to the upper left side of the fork-shaped rocker arm 41. The fork-shaped pressure plate 42 is embedded in the open end of the fork-shaped rocker arm 41. The first vertical shaft 44 passes through the bushing 43 on the upper side of one end of the fork-shaped rocker arm 41, the horizontal bending wheel 47 on the left side of the fork-shaped rocker arm 41, the lower left side of the fork-shaped rocker arm 41, and the first panel assembly weldment 1 or the second panel assembly weldment 6. The upper and lower ends of the first vertical shaft are respectively fixed to the first panel assembly weldment 1 or the second panel assembly weldment 6 by nuts 48. The second vertical shaft 45 passes horizontally from bottom to top through the middle of the fork-shaped rocker arm 41, the fork-shaped pressure plate 42, and another horizontal bending wheel 47 in the open end of the fork-shaped pressure plate 42. The second vertical shaft 45 and the other horizontal bending wheel 47 are supported in the fork-shaped pressure plate 42 by the upper nut 49. The left end of the adjusting screw 46 is screwed into the closed end of the fork-shaped rocker arm 41, and then extends into the closed end of the fork-shaped pressure plate 42. The second vertical shaft 45 passes horizontally through the oblong holes 411 on the upper and lower sides of the middle of the fork-shaped rocker arm 41. In this embodiment, the center distance A of the oblong holes 411 is 10mm. The second vertical shaft 45 can move left and right in the oblong holes 411, facilitating the horizontal bending wheel 47 on the second vertical shaft 45 to approach the horizontal bending wheel 47 on the first vertical shaft 44, thereby clamping the high-pressure oil pipe assembly 300 for bending. Alternatively, the high-pressure oil pipe assembly 300 can be moved away from the horizontal bending wheels 47 on both sides, making it easier to remove the bent high-pressure oil pipe assembly 300. A handle 410 for easy operation is welded to the lower side of the closed end of the fork-shaped rocker arm 41. The radial arc groove diameter D of the horizontal bending wheel 47 matches the outer diameter d of the high-pressure oil pipe assembly 300, ensuring that the surface of the bent high-pressure oil pipe assembly 300 is free of indentations, thus improving the surface quality of the high-pressure oil pipe assembly 300.

[0040] The 90° bend horizontal clamping assembly 7 includes a 90° bend module 71 and a bend horizontal clamping block 72. The upper vertical tube 301 of the 90° bend of the high-pressure oil pipe assembly is embedded in the upper part of the 90° bend module 71. The bottom of the 90° bend module 71 is fixed to the second panel assembly weldment 6. The bend horizontal clamping blocks 72, which are fixed at both ends to the upper part of the 90° bend module 71, clamp the upper vertical tube 301 of the 90° bend of the high-pressure oil pipe assembly.

[0041] The straight pipe section horizontal clamping assembly 8 includes a straight pipe section module 81 and a horizontal clamping block 82. The bottom of the straight pipe section module 81 is fixed on the second panel assembly weldment 6. The lower horizontal pipe 302 of the 90° bend of the high-pressure oil pipe assembly is embedded in the upper part of the straight pipe section module 81. The horizontal clamping blocks 82, which are vertically fixed at both ends to the upper part of the straight pipe section module 81, clamp the lower horizontal pipe 302 of the 90° bend of the high-pressure oil pipe assembly.

[0042] A bending method for a high-pressure oil pipe assembly bending clamp for marine diesel engines includes the following steps:

[0043] 1) First 90° pipe bend

[0044] 1.1) First, fix the assembled initial 90° pipe bending fixture 100 on the worktable, then rotate the fork-shaped rocker arm 41 counterclockwise to... Figure 4 The center line BB of the fork-shaped rocker arm shown is perpendicular to the initial orientation of the center line CC of the two straight pipe support blocks, which facilitates the straight high-pressure oil pipe assembly 300 to pass through the radial arc grooves of the two horizontal bending wheels 47, thus completing the preparation before the first 90° pipe bend.

[0045] 1.2) Pass one end of the assembled straight high-pressure oil pipe assembly 300 through the radial arc grooves of the two horizontal bending wheels 47 inside the fork-shaped rocker arm 41 and the upper side of the two straight pipe support blocks 31 in sequence until the left end of the straight high-pressure oil pipe assembly 300 abuts against the end of the horizontal positioning screw 22 of the high-pressure oil pipe assembly end limit assembly 2. Next, the top cover 32 is fixed on the straight pipe support block 31 to clamp the straight high-pressure oil pipe assembly 300. Then, the adjusting screw 46 is tightened. The left end of the adjusting screw 46 pushes the adjusting fork-shaped pressure plate 42, the second vertical shaft 45 and the horizontal bending wheel 47 in the middle of the second vertical shaft 45 to move to the left along the oval hole 411 on the upper and lower sides of the middle of the fork-shaped rocker arm 41, so as to clamp the assembly 3 vertically in the adjacent straight pipe section. This continues until the radial arc grooves of the two horizontal bending wheels 47 clamp the straight high-pressure oil pipe assembly 300 and prevent it from moving. This completes the preparation for the first 90° bend of the straight high-pressure oil pipe assembly 300.

[0046] 1.3) The operator holds the handle 410 on the lower side of the closed end of the fork-shaped rocker arm 41 and rotates it clockwise around the axis of the first vertical shaft 44 until the left side of the fork-shaped rocker arm 41 abuts against the end of the horizontal positioning screw 22 of the 90° bending positioning component 5. At this time, the right end of the high-pressure oil pipe assembly 300 completes the first bending under the rolling action of the horizontal bending wheel 47 on the second vertical shaft 45. The bending angle is 90° + the first springback angle α determined by the trial bending. By adjusting the extension length of the horizontal positioning screw 22 of the 90° bending positioning component 5, the first springback angle α of the first 90° bending of the high-pressure oil pipe assembly 300 is adjusted, thus completing the first 90° bending of the high-pressure oil pipe assembly 300.

[0047] When removing the high-pressure oil pipe assembly 300 after the first 90° bend, first loosen the adjusting screw 46, then pull the second vertical shaft 45 to the right in the direction of the handle 410 to increase the center distance between the two horizontal bending wheels 47. The 90° bend of the high-pressure oil pipe assembly is released from constraint. After removing the upper cover 32 fixed on the straight pipe support block 31, the high-pressure oil pipe assembly 300 after the first 90° bend can be taken out.

[0048] 2) Secondary 170° pipe bending forming

[0049] 2.1) First, fix the assembled secondary 170° pipe bending fixture 200 on the worktable, then rotate the fork-shaped rocker arm 41 counterclockwise to... Figure 6 The center line DD of the fork-shaped rocker arm shown is perpendicular to the center line EE of the horizontal clamping assembly of the straight pipe section, which facilitates the lower horizontal pipe 302 of the high-pressure oil pipe assembly that has completed the first 90° bend to pass through the radial arc grooves of the two horizontal bending wheels 47, thus completing the preparation before the second 170° bend.

[0050] 2.2) The vertical tube 301 at the upper end of the 90° bend of the high-pressure oil pipe assembly, which has completed its first 90° bend, is embedded in the upper part of the 90° bend module 71. The horizontal tube 302 at the lower end of the 90° bend of the high-pressure oil pipe assembly is first embedded in the upper part of the straight pipe module 81, and then passes through the radial arc groove between the two horizontal bending wheels in the fork-shaped rocker arm 41. The horizontal clamping block 72 of the bend is then fixed to one side of the upper part of the 90° bend module 71, and the horizontal clamping block 82 is fixed to one side of the upper part of the straight pipe module 81. Next, tighten the adjusting screw 46, push the adjusting fork-shaped pressure plate 42, the second vertical shaft 44 and the horizontal bending wheel 47 in the middle of the second vertical shaft 44 along the oval hole 411 on the upper and lower sides of the middle of the fork-shaped rocker arm 41 towards the adjacent straight pipe horizontal clamping assembly 8, that is, move to the left, until the radial arc grooves of the two horizontal bending wheels 47 clamp the lower horizontal pipe 302 of the 90° bend of the high-pressure oil pipe assembly and cannot move, thereby fixing the high-pressure oil pipe assembly 300, which has completed the first 90° bend, in the 90° bend module assembly 7 and the straight pipe module assembly 8, completing the preparation for the second 170° bend of the high-pressure oil pipe assembly 300.

[0051] 2.3) The operator holds the handle 410 on the lower side of the closed end of the fork-shaped rocker arm 41 and rotates it clockwise around the axis of the first vertical shaft 44 until the left side of the fork-shaped rocker arm 41 abuts against the end of the horizontal positioning screw 22 of the 170° bending positioning component 9. At this time, the right end of the high-pressure oil pipe assembly 300 completes a secondary bending under the rolling action of the horizontal bending wheel 47 on the second vertical shaft 45. The bending angle is 170° + the second spring angle β determined by the trial bending. The second spring angle β of the secondary 170° bending determined by the trial bending is adjusted by adjusting the extension length of the horizontal positioning screw 22 of the 170° bending positioning component 9.

[0052] When removing the high-pressure oil pipe assembly 300 after completing the second 170° bend, first loosen the adjusting screw 46, then pull the second vertical shaft 45 to the right towards the handle 410, which increases the center distance between the two horizontal bending wheels 47, thus releasing the constraint on the 170° bend of the high-pressure oil pipe assembly 300. After removing the horizontal clamping block 72 fixed on the upper part of the bending module 71 and the horizontal clamping block 82 fixed on the upper part of the straight pipe module 81, the high-pressure oil pipe assembly 300 after completing the second 170° bend can be taken out. The operation is labor-saving and convenient.

[0053] In addition to the above embodiments, the present invention may have other implementation methods. All technical solutions formed by equivalent substitution or equivalent transformation fall within the protection scope claimed by the present invention.

Claims

1. A bending clamp assembly for a high-pressure oil pipe assembly of a marine diesel engine, wherein the high-pressure oil pipe assembly of the marine diesel engine has a bending angle of 90° in the X0Z plane of a three-dimensional coordinate system and a bending angle of 170° in the X0Y plane; characterized in that, The fixture includes a primary 90° pipe bending clamp and a secondary 170° pipe bending clamp. The primary 90° pipe bending clamp includes a first panel assembly, a high-pressure oil pipe assembly end-limiting assembly, two spaced-apart vertical clamping assemblies for the straight pipe section, a bending roller assembly, and a 90° bending positioning assembly I. The secondary 170° pipe bending clamp includes a second panel assembly, a 90° bending section horizontal clamping assembly, a straight pipe section horizontal clamping assembly, a bending roller assembly, and a 170° bending positioning assembly II. The high-pressure oil pipe assembly end-limiting assembly is fixed to one end of the first panel assembly, and the vertical clamping assemblies for the straight pipe section are spaced-apart and fixed to the first panel. The high-pressure oil pipe assembly end limiting assembly is located on the middle of the plate assembly weldment, and the central axis of the high-pressure oil pipe assembly end limiting assembly matches the central axis of the straight pipe section vertical clamping assembly; the bending roller assembly is located on the other end of the first panel assembly weldment, and the 90° bending positioning assembly I is obliquely placed on the corner of the other end of the first panel assembly weldment; the 90° bending section horizontal clamping assembly is fixed on one corner of the second panel assembly weldment, the bending roller assembly is located on the middle of one side of the second panel assembly weldment, the straight pipe section horizontal clamping assembly is located between the 90° bending section horizontal clamping assembly and the bending roller assembly, and the 170° bending positioning assembly II is obliquely placed on the middle of the other side of the second panel assembly weldment; The bending roller assembly includes a fork-shaped rocker arm, a fork-shaped pressure plate, a bushing, a first vertical shaft, a second vertical shaft, an adjusting screw, and two horizontal bending wheels. The bushing is fixed to the upper side of one end of the fork-shaped rocker arm. The fork-shaped pressure plate is embedded in the open end of the fork-shaped rocker arm. The first vertical shaft passes through the bushing on the upper side of one end of the fork-shaped rocker arm, a horizontal bending wheel, the lower side of one end of the fork-shaped rocker arm, and either the first or second panel assembly weldment. The upper and lower ends of the first vertical shaft are respectively fixed to the first or second panel assembly weldment by nuts. The second vertical shaft passes through the middle of the fork-shaped rocker arm, the fork-shaped pressure plate, and another horizontal bending wheel in the open end of the fork-shaped pressure plate, and is supported in the fork-shaped pressure plate by an upper nut. One end of the adjusting screw is screwed into the closed end of the fork-shaped rocker arm, and the other end of the adjusting screw is screwed into the closed end of the fork-shaped rocker arm and then extends into the closed end of the fork-shaped pressure plate.

2. The marine diesel engine high-pressure oil pipe assembly bending clamp as described in claim 1, characterized in that, The high-pressure oil pipe assembly end limiting component, the 90° bending positioning component I, and the 170° bending positioning component II have the same structure. They respectively include a vertically arranged high-pressure oil pipe assembly end limiting fixing block, a 90° bending positioning fixing block, and a 170° bending positioning fixing block, as well as horizontally fixed at the center of the high-pressure oil pipe assembly end limiting fixing block, the center of the 90° bending positioning fixing block, and the center of the 170° bending positioning fixing block, respectively. There are also fixing nuts screwed onto the horizontal positioning screws and clamping the two sides of the corresponding fixing blocks. The high-pressure oil pipe assembly end limiting fixing block and the 90° bending positioning fixing block are respectively fixed at the corresponding positions of the first panel assembly weldment, and the 170° bending positioning fixing block is fixed at the corresponding position of the second panel assembly weldment.

3. The marine diesel engine high-pressure oil pipe assembly bending clamp assembly as described in claim 1, characterized in that, The vertical clamping assembly for the straight pipe section includes a straight pipe section support block and a top cover. The bottom of the straight pipe section support block is fixed at intervals on the middle of the first panel assembly weldment. The lower side of the straight pipe section of the high-pressure oil pipe assembly is supported on the upper part of the straight pipe section support block. The top cover presses on the high-pressure oil pipe assembly. Both ends of the top cover are fixedly connected to the straight pipe section support block by vertical fastening screws.

4. The marine diesel engine high-pressure oil pipe assembly bending clamp assembly as described in claim 1, characterized in that, The second vertical shaft passes through the oval holes on the upper and lower sides of the middle part of the fork-shaped rocker arm, and the center distance A of the oval holes is 8 to 12 mm.

5. The marine diesel engine high-pressure oil pipe assembly bending clamp as described in claim 1, characterized in that, A handle is welded to the lower side of the closed end of the fork-shaped rocker arm.

6. The marine diesel engine high-pressure oil pipe assembly bending clamp assembly as described in claim 1, characterized in that, The radial arc groove diameter D of the horizontal bending wheel matches the outer diameter d of the high-pressure oil pipe assembly.

7. The marine diesel engine high-pressure oil pipe assembly bending clamp assembly as described in claim 1, characterized in that, The 90° bend horizontal clamping assembly includes a 90° bend module and a bend horizontal clamping block. The upper vertical tube of the 90° bend of the high-pressure oil pipe assembly is embedded in the upper part of the 90° bend module. The bottom of the 90° bend module is fixed to the second panel assembly. The bend horizontal clamping block, with both ends fixed to the upper part of the 90° bend module, clamps the upper vertical tube of the 90° bend of the high-pressure oil pipe assembly. The straight pipe horizontal clamping assembly includes a straight pipe module and a horizontal clamping block. The bottom of the straight pipe module is fixed to the second panel assembly. The lower horizontal tube of the 90° bend of the high-pressure oil pipe assembly is embedded in the upper part of the straight pipe module. The horizontal clamping block, with both ends vertically fixed to the upper part of the straight pipe module, clamps the lower horizontal tube of the 90° bend of the high-pressure oil pipe assembly.

8. A pipe bending method using the pipe bending clamp assembly for marine diesel engine high-pressure oil pipes as described in any one of claims 1 to 7, characterized in that, Includes the following steps: First 90° pipe bend 1.1) First, fix the assembled first 90° pipe bending fixture on the workbench, then rotate the fork-shaped rocker arm counterclockwise to the initial position where the center line of the fork-shaped rocker arm is perpendicular to the center line of the two straight pipe support blocks, thus completing the preparation before the first 90° pipe bending. 1.2) Pass one end of the assembled straight high-pressure oil pipe assembly through the radial arc grooves of the two horizontal bending wheels inside the fork-shaped rocker arm and the upper side of the two straight pipe support blocks in sequence until the end of the straight high-pressure oil pipe assembly abuts against the end of the horizontal positioning screw of the high-pressure oil pipe assembly end limit assembly; then fix the top cover to the straight pipe support block to clamp the straight high-pressure oil pipe assembly, and then tighten the adjusting screw. One end of the adjusting screw pushes the adjusting fork-shaped pressure plate, the second vertical shaft and the horizontal bending wheel in the middle of the second vertical shaft to move along the oval holes on the upper and lower sides of the middle of the fork-shaped rocker arm toward the adjacent straight pipe vertical clamping assembly until the radial arc grooves of the two horizontal bending wheels clamp the straight high-pressure oil pipe assembly and cannot move, thus completing the preparation for the first 90° bend of the straight high-pressure oil pipe assembly; 1.3) The operator holds the handle on the lower side of the closed end of the fork-shaped rocker arm and rotates it clockwise around the first vertical axis until one side of the fork-shaped rocker arm abuts against the end of the horizontal positioning screw of the 90° bending positioning component I. At this time, one end of the high-pressure oil pipe assembly completes its first bend under the rolling action of the horizontal bending wheel on the second vertical axis, with a bending angle of 90° + the first springback angle α determined by the trial bend. The first springback angle α of the high-pressure oil pipe assembly's first 90° bend is adjusted by adjusting the extension length of the horizontal positioning screw of the 90° bending positioning component I. When removing the high-pressure oil pipe assembly after its first 90° bend, first loosen the adjusting screw, then pull the second vertical shaft towards the handle to increase the center distance between the two horizontal bending wheels. This releases the constraint on the 90° bend of the high-pressure oil pipe assembly. After removing the top cover fixed to the straight pipe support block, the high-pressure oil pipe assembly after its first 90° bend can be taken out. 2) Secondary 170° pipe bending forming 2.1) First, fix the assembled secondary 170° pipe bending fixture on the workbench, then rotate the fork-shaped rocker arm counterclockwise until the center line of the fork-shaped rocker arm is perpendicular to the center line of the horizontal clamping assembly of the straight pipe section, thus completing the preparation before the secondary 170° pipe bending. 2.2) The vertical tube at the upper end of the 90° bend of the high-pressure oil pipe assembly, which has already completed its first 90° bend, is embedded in the upper part of the 90° bend module. The horizontal tube at the lower end of the 90° bend of the high-pressure oil pipe assembly is first embedded in the upper part of the straight pipe module, and then passes through the radial arc grooves between the two horizontal bending wheels inside the fork-shaped rocker arm. The horizontal clamping block of the bend is then fixed on one side of the upper part of the 90° bend module, and the horizontal clamping block is fixed on one side of the upper part of the straight pipe module. Next, the adjusting screw is tightened, and the fork-shaped pressure plate, the second vertical shaft, and the horizontal bending wheel in the middle of the second vertical shaft are pushed to move along the oval holes on the upper and lower sides of the middle of the fork-shaped rocker arm toward the adjacent horizontal clamping assembly of the straight pipe section, until the radial arc grooves of the two horizontal bending wheels clamp the horizontal tube at the lower end of the 90° bend of the high-pressure oil pipe assembly and cannot move. This fixes the high-pressure oil pipe assembly, which has already completed its first 90° bend, in the 90° bend module assembly and the straight pipe module assembly, completing the preparation for the second 170° bend of the high-pressure oil pipe assembly. 2.3) The operator holds the handle on the lower side of the closed end of the fork-shaped rocker arm and rotates it clockwise around the first vertical axis until one side of the fork-shaped rocker arm abuts against the end of the horizontal positioning screw of the 170° bending positioning component II. At this time, the other end of the high-pressure oil pipe assembly completes a secondary bend under the rolling action of the horizontal bending wheel on the second vertical axis. The bending angle is 170° + the second spring angle β determined by the trial bend. The second spring angle β of the secondary 170° bend determined by the trial bend is adjusted by adjusting the extension length of the horizontal positioning screw of the 170° bending positioning component II. When removing the high-pressure oil pipe assembly that has completed the second 170° bend, first loosen the adjusting screw, then pull the second vertical shaft towards the handle to increase the center distance between the two horizontal bending wheels. This releases the constraint on the 170° bend of the high-pressure oil pipe assembly. After removing the horizontal clamping block fixed to the upper part of the bending module and the horizontal clamping block fixed to the upper part of the straight pipe module, the high-pressure oil pipe assembly that has completed the second 170° bend can be taken out.

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