Marine diesel engine frame single-piece assembly tool and assembly method

Abstract

The application discloses a rack single-piece assembling tool and method for a marine diesel engine, and the tool comprises an assembling workbench, a main support, a main support moving device, a welding plate supporting device, a longitudinal clamping device and a transverse positioning device hinged with the main support. The main support moving device comprises a main support moving oil cylinder, a main support moving oil cylinder support and a pair of main support moving linear guides, the welding plate supporting device comprises two bulkheads supporting seats, a front supporting seat, four transverse web supporting seats and four guide plate grooves, the longitudinal clamping device comprises two groups of front pressing oil cylinder assemblies, one group of bulkhead pressing oil cylinder assemblies and two groups of transverse web-guide plate rear pressing oil cylinder assemblies, and the transverse positioning device comprises a swing arm, two swing rods and two guide wheels. The method comprises the following steps: 1) hoisting each plate piece; 2) completing transverse positioning of each plate piece; and 3) clamping each plate piece and spot welding to form. The application has good universality, and significantly improves the assembling efficiency and assembling quality of the rack single piece.

Description

Technical Field

[0001] This invention relates to an assembly fixture for metal plates before welding, and more particularly to a single-piece assembly fixture and method for a diesel engine frame, belonging to the field of welding fixture technology. Background Technology

[0002] Marine diesel engines are used in ship propulsion systems and ship power plants, and are often referred to as the "heart" of a ship. The engine frame is a welded box-shaped steel structure that houses the crosshead and connecting rods, and is a crucial component of the marine diesel engine. The engine frame is constructed by welding individual frame pieces and other plate structural components together. Each individual frame piece is a vital welded steel structural component, and its strength and precision directly affect the overall quality of the marine diesel engine. Figure 1 As shown, the frame piece 100 is trapezoidal, and is welded together by two right-angled trapezoidal horizontal web plates 10, a middle partition plate 20, guide plates 30 that are vertically clamped on both sides of the horizontal web plate 10 and between adjacent horizontal web plates 10, and bottom plates 40 that are vertically set at the bottom of the horizontal web plate 10. The frame piece structure is large and heavy, and requires the use of assembly tooling to assemble, position and spot weld each piece.

[0003] Existing assembly tooling has the following problems when assembling and positioning individual frame pieces: The tooling is incompatible with different models of marine diesel engines, resulting in poor versatility and a narrow range of applications. Each model of marine diesel engine requires a specific tooling, leading to a large footprint and increased processing costs. Furthermore, when installing and positioning the frame pieces on the tooling, the adjustment of the distance between the two guide plates on the frame piece is slow and lacks precision, resulting in low assembly accuracy. The use of jacks to adjust the gaps between components is inefficient, lacks a unified positioning benchmark, and results in low assembly accuracy, high labor intensity, and reduced work efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a single-piece assembly tooling and method for marine diesel engine frames that offers precise assembly positioning and high construction efficiency.

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

[0006] A single-piece assembly fixture for a marine diesel engine frame includes an assembly workbench, a main support, a main support moving device, a welding plate support device, a longitudinal clamping device, and a transverse positioning device. The main support is a steel box girder structure, including a crossbeam and two longitudinal beams. The length of the crossbeam is greater than the width of the assembly workbench. One end of each longitudinal beam is perpendicularly fixed to both ends of the crossbeam to form a horizontally oriented main support. The middle part of the transverse positioning device is hinged to the other end of each longitudinal beam.

[0007] The main support moving device includes a main support moving cylinder, a main support moving cylinder support, two pairs of crossbeam supports, and a pair of main support moving linear guides. One end of the horizontally arranged main support moving cylinder is fixed on the main support moving cylinder support. The bottom of the main support moving cylinder support is fixed on the longitudinal center of one end of the assembly workbench and is located on the outside of the crossbeam. One end of the piston rod of the main support moving cylinder is fixed on the center of the outer side of the crossbeam through a connecting plate. The pairs of crossbeam supports are respectively vertically fixed on both ends of the inner and outer sides of the crossbeam. The bottom of the crossbeam supports is supported on both sides of one end of the assembly workbench through the main support moving linear guides parallel to the longitudinal center of the assembly workbench.

[0008] The welding plate support device includes two longitudinally spaced partition plate support seats arranged at the longitudinal center of the assembly workbench, a pair of front support seats arranged on both sides of the partition plate support seats near the crossbeam, four transverse web plate support seats arranged in a rectangular shape in the middle of the assembly workbench, and four guide plate grooves arranged in a rectangular shape symmetrically on both sides of the front and rear partition plate support seats. The four guide plate grooves are arranged longitudinally into two groups. The bottom of the front support seat, the partition plate support seat, and the transverse web plate support seat are fixed to the assembly workbench. The lower part of the guide plate groove is supported on the assembly workbench by a transverse linear guide rail. The two ends of the partition plate are supported on the partition plate support seats, and the two ends of the transverse web plate are supported on the front support seat and the two longitudinally spaced transverse web plate support seats. The lower part of the guide plate, which is vertically arranged between the adjacent sides of the transverse web plate and the partition plate, is embedded in the guide plate groove.

[0009] The longitudinal clamping device includes two sets of front clamping cylinder assemblies, one set of middle partition plate clamping cylinder assemblies, and two sets of transverse web plate-guide plate rear clamping cylinder assemblies. The front clamping cylinder assemblies are symmetrically arranged on the middle of the crossbeam and are adjacent to one end of the transverse web plate and one end of the guide plate on both sides of the frame piece. One set of middle partition plate clamping cylinder assemblies is arranged at the rear of the longitudinal center of the assembly workbench and is adjacent to the end of the middle partition plate of the frame piece away from the crossbeam. The two sets of transverse web plate-guide plate rear clamping cylinder assemblies are respectively arranged on both sides of the rear end of the assembly workbench and are adjacent to the other end of the transverse web plate and the bottom plate on both sides of the frame piece.

[0010] The objectives of this invention can also be further achieved through the following technical measures.

[0011] Furthermore, the lateral positioning device includes a swing arm and two swing rods. The hinge joint extending laterally from the middle of the swing arm extends into the other end of the longitudinal beam and is hinged to the other end of the longitudinal beam. The middle part of the swing rod is hinged to one end of the swing arm, and the end of the swing rod near the adjacent hypotenuse of the transverse web plate is hinged to the guide wheel. When the individual plates of the frame are assembled and positioned, the guide wheels abut against the hypotenuse of the adjacent transverse web plate.

[0012] Furthermore, the middle partition support, the front support, and the transverse web support are all welded steel plate components. The middle partition support is H-shaped, the front support is strip-shaped, and the transverse web support is a rectangular frame. Wear-resistant plates are fixed to the top surfaces of the middle partition support, the front support, and the transverse web support.

[0013] Furthermore, the guide plate groove is inverted Π shape, the upper groove opening of the guide plate groove matches the thickness of the guide plate, and the support plate under the bottom of the guide plate groove is fixedly connected to the slider of the transverse linear guide rail body. The transverse linear guide rail body is fixed in the rectangular recess in the middle of the assembly workbench.

[0014] Furthermore, the front clamping cylinder assemblies are located on both sides of the main support moving cylinder. Each front clamping cylinder assembly includes two front clamping cylinders, a front clamping cylinder mounting plate, a cuboid pressure head, and a cylindrical pressure head. The two front clamping cylinders arranged side by side are horizontally fixed to the middle of the crossbeam through the front clamping cylinder mounting plate. The output end of one front clamping cylinder is connected to one end of the cuboid pressure head, and the other end of the cuboid pressure head is supported in the rectangular guide hole of the front side plate of the crossbeam. The output end of the other front clamping cylinder is connected to one end of the cylindrical pressure head, and the other end of the cylindrical pressure head is supported in the circular guide hole adjacent to the rectangular guide hole of the front side plate of the crossbeam, and the cuboid pressure head is close to the main support moving cylinder. When the frame is assembled and positioned, the other end of the cuboid pressure head presses on the end of the guide plate close to the crossbeam, and the other end of the cylindrical pressure head presses on the end of the transverse web plate close to the crossbeam.

[0015] Furthermore, the partition plate clamping cylinder assembly includes a partition plate clamping cylinder, a partition plate pressure head, and a partition plate pressure head guide frame. One end of the partition plate clamping cylinder is horizontally fixed on one end of the partition plate pressure head guide frame. The output end of the partition plate clamping cylinder is connected to one end of the partition plate pressure head. The middle part of the partition plate pressure head is supported in the guide hole of the partition plate pressure head guide frame. The bottom of the partition plate pressure head guide frame is fixed on the rear center of the assembly workbench. When the frame is assembled and positioned, the other end of the partition plate pressure head presses on the end of the partition plate away from the crossbeam.

[0016] Furthermore, the rear clamping cylinder assembly of the transverse web plate-guide plate includes two rear clamping cylinders, a first guide column, a second guide column, and a double guide frame. One end of each of the horizontally arranged rear clamping cylinders is fixed to the middle of the double guide frame. The output end of each rear clamping cylinder is fixedly connected to one end of the first guide column and one end of the second guide column. The middle parts of the first and second guide columns are respectively supported in the corresponding guide holes of the double guide frame. The bottom of the double guide frame is fixed to the rear sides of the assembly workbench. The diameter of the first guide column is larger than that of the second guide column, and the first guide column is located on the inner side of the assembly workbench of the double guide frame near the clamping cylinder of the middle partition plate. When the frame is assembled and positioned, the other end of the first guide column and the other end of the second guide column press against the bottom plate, and the bottom plate is vertically abutted against the other end of the transverse web plate away from the crossbeam.

[0017] A method for assembling a single piece of frame for a marine diesel engine, comprising the following steps:

[0018] 1) Before assembling each frame piece, move the two sets of longitudinally arranged guide slots outward along the transverse linear guide rails towards the longitudinal edges of the assembly workbench, increasing the center distance between the two rows of guide slots to be greater than the width of the partition plate. Then, hoist the guide plates and insert them vertically into the upper slots of their respective guide slots. Next, hoist the partition plate onto the two spaced partition plate supports at the longitudinal center of the assembly workbench. Then, hoist the transverse web plates onto the corresponding front support and the two transverse web plate supports. Finally, vertically hoist the bottom plate between the bottom of the transverse web plate and the first and second guide columns to complete the hoisting of each frame piece.

[0019] 2) First, start the main support moving cylinder. The piston rod of the main support moving cylinder pushes the two ends of the main support beam to move along a pair of main support moving linear guides towards the middle partition, the two transverse webs and one end of the two guide plates. The swing arms on the inner side of the longitudinal beams at both ends of the main support move towards the corresponding transverse web inclined side. When the guide wheel at the end of the swing arm abuts against the lower side of the corresponding transverse web inclined side, the guide wheel at the end of the swing arm automatically abuts against the upper side of the transverse web inclined side. The main support continues to move. The horizontal and vertical components of the force between the guide wheels at both ends of the swing arm and the transverse web inclined side push the transverse web to move longitudinally and also move laterally towards the guide plates. The piston rod of the main support moving cylinder continues to push the main support to move. The gap between the transverse web and the guide plate, as well as the gap between the guide plate and the two sides of the middle partition, continuously decrease until the guide plates abut against the two sides of the middle partition after lateral movement, completing the lateral positioning of each plate of the frame.

[0020] 3) After the piston rod of the main support moving cylinder stops extending and retracts, two sets of front clamping cylinders, the middle partition clamping cylinder, and two sets of rear clamping cylinders are simultaneously activated. The cuboid pressure head and the cylindrical pressure head move outward respectively. The middle partition pressure head, the first guide post, and the second guide post also move outward to press against the guide plate, the middle partition, the transverse web plate, and the bottom plate, so that the transverse web plate presses against the corresponding bottom plate. The guide plate, the middle partition, and the transverse web plate are kept flush with the end near the crossbeam. At this time, the front clamping cylinder, the middle partition clamping cylinder, and the rear clamping cylinder are all in the pressure holding state, with a pressure holding oil pressure of 8-10 MPa.

[0021] 4) Measure the main dimensions of each frame piece, the relative positions of each plate, and the overall shape of the frame piece according to the design requirements. Then, spot weld each plate together to form a frame piece weldment blank. Finally, retract the piston rods of each cylinder and unload the frame piece weldment blank.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] This invention features a simple structure and is easy to operate. When the main support moves towards the frame piece, the guide wheels at the ends of the swing arms move towards the corresponding inclined sides of the transverse web. After the swing arms on both sides swing, the guide wheels at both ends automatically abut against the upper and lower sides of the corresponding inclined sides of the transverse web, pushing the transverse web downwards while simultaneously moving it laterally. This eliminates the gap between the transverse web and the adjacent guide plates and the partition plate on one side of the guide plates, achieving proper positioning and solving the problem of positioning and clamping transverse webs with inclined sides. The laterally movable guide plate groove of this invention allows for flexible adjustment of the guide plate spacing and is compatible with frame pieces of different specifications, significantly reducing manufacturing costs and the area occupied by tooling. The guide plate groove of the movable parts facilitates the removal of the assembled frame piece weldment blank. The main support moving cylinder, two sets of front clamping cylinders, middle partition clamping cylinder, and two sets of rear clamping cylinders facilitate applying pressure to the transverse web plate, guide plate, and both ends of the middle partition plate of the frame piece, making the ends of each frame piece flush. This also meets the assembly requirements of different models of frame pieces, significantly improving the versatility of the invention and reducing labor intensity; it also significantly improves the assembly efficiency and quality of the frame pieces.

[0024] 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

[0025] Figure 1 A perspective view of a single frame piece assembled using the present invention;

[0026] Figure 2 This is a perspective view of the present invention;

[0027] Figure 3 This is a perspective view of the guide plate groove and the transverse linear guide rail below it of the present invention. Detailed Implementation

[0028] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0029] In the description of this invention, terms such as “center,” “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.

[0030] like Figures 1-3 As shown, the present invention includes an assembly workbench 1, a main support 2, a main support moving device 3, a welding plate support device 4, a longitudinal clamping device 5, and a transverse positioning device 6. The main support 2 is a steel box girder structure, including a crossbeam 21 and two longitudinal beams 22. The length of the crossbeam 21 is greater than the width of the assembly workbench 1. One end of the longitudinal beam 22 is perpendicularly fixed to both ends of the crossbeam 21 to form a horizontal gate-shaped main support 2.

[0031] The main support moving device 3 includes a main support moving cylinder 31, a main support moving cylinder support 32, two pairs of crossbeam supports 33, and a pair of main support moving linear guides 34. The right end of the horizontally arranged main support moving cylinder 31 is fixed to the main support moving cylinder support 32. The bottom of the main support moving cylinder support 32 is fixed at the longitudinal center of the left end of the assembly workbench 1 and is located outside the left side of the crossbeam 21. One end of the piston rod 311 of the main support moving cylinder is fixed to the center of the outer side of the crossbeam 21 through a connecting plate 35. The pairs of triangular crossbeam supports 33 are vertically fixed at both ends of the inner and outer sides of the crossbeam 21. The bottom of the crossbeam supports 33 is supported on both sides of the left end of the assembly workbench 1 by the main support moving linear guides 34 parallel to the longitudinal center of the assembly workbench 1.

[0032] The welding plate support device 4 includes two longitudinally spaced partition plate support seats 41 arranged at the longitudinal center of the assembly workbench 1, a pair of front support seats 42 arranged on both sides of the partition plate support seats 41 near the crossbeam 21, four transverse web plate support seats 43 located in the middle of the assembly workbench 1 and arranged in a rectangular shape, and four guide plate grooves 44 symmetrically arranged on both sides of the front and rear partition plate support seats 42 and arranged in a rectangular shape. The four guide plate grooves 44 are arranged longitudinally into two groups. The bottom of the front support seat 42, the partition plate support seat 41 and the transverse web plate support seat 43 are respectively fixed on the assembly workbench 1, and the lower part of the guide plate grooves 44 is supported on the assembly workbench 1 by transverse linear guide rails 45. The two ends of the partition plate 20 are respectively supported on the partition plate support seat 41, and the two ends of the transverse web plate 10 are respectively supported on the front support seat 42 and two longitudinally spaced transverse web plate support seats 43. The lower part of the guide plate 40, which is vertically arranged between the adjacent sides of the transverse web plate 10 and the partition plate 20, is embedded in the upper slot 441 of the guide plate groove. Figure 3 As shown, the guide plate groove 44 is inverted Π shape. The upper groove 441 of the guide plate groove matches the thickness of the guide plate 30. The two ends of the support plate 45 under the bottom of the guide plate groove 44 are respectively fixed to the transverse linear guide slider 451 on the transverse linear guide body 452. The transverse linear guide body 452 is fixed in the rectangular sink 11 in the middle of the assembly workbench 1.

[0033] The partition plate support 41, front support 42, and cross web support 43 are all welded steel plate components. The partition plate support 41 is H-shaped, the front support 42 is strip-shaped, and the cross web support 43 is a rectangular frame. Wear-resistant plates 411 are fixed to the top surfaces of the partition plate support 41, front support 42, and cross web support 43, which reduces the contact area between the cross web 10, partition plate 20, and guide plate 30 and the upper side of each support. However, after long-term use, the wear-resistant plates 411 wear down, resulting in inconsistent heights of the supports. This causes the support surfaces of the cross web 10 and partition plate 20 to be out of plane, affecting the assembly quality of the frame piece 100. In this case, it is only necessary to measure the height of the top of each support, calculate the different grinding amounts of each wear-resistant plate 411 based on the lowest height, remove the wear-resistant plates 411 that need to be ground, grind them, and then reinstall them on their corresponding supports to make the heights of each support consistent, thus improving the assembly quality of the frame piece 100. Since there is no need to replace the support base, the assembly cost of a single rack unit is reduced.

[0034] The longitudinal clamping device 5 includes two sets of front clamping cylinder assemblies 51, one set of middle partition plate clamping cylinder assemblies 52, and two sets of transverse web plate-guide plate rear clamping cylinder assemblies 53. The front clamping cylinder assemblies 51 are symmetrically arranged on the middle of the crossbeam 21 and are adjacent to the left ends of the transverse web plates 10 and guide plates 30 on both sides of the frame piece 100. The middle partition plate clamping cylinder assembly 52 is located at the rear of the longitudinal center of the assembly workbench 1 and is adjacent to the right end of the middle partition plate 20 of the frame piece 100 away from the crossbeam 21. The two sets of transverse web plate-guide plate rear clamping cylinder assemblies 53 are respectively located on both sides of the rear end of the assembly workbench 1 and are adjacent to the right ends of the transverse web plates 10 on both sides of the frame piece 100.

[0035] The front clamping cylinder assemblies 51 are located on both sides of the main support moving cylinder 31. Each front clamping cylinder assembly 51 includes two front clamping cylinders 511, a front clamping cylinder mounting plate 512, a cuboid pressure head 513, and a cylindrical pressure head 514. The right ends of the two front clamping cylinders 511 arranged side by side are horizontally fixed to the middle of the crossbeam 21 through the front clamping cylinder mounting plate 512. The output end of one front clamping cylinder 511 is connected to the left end of the cuboid pressure head 513, and the right end of the cuboid pressure head 513 is supported in the rectangular guide hole 212 of the front side plate 211 of the crossbeam. The output end of the other front clamping cylinder 511 is connected to the left end of the cylindrical pressure head 514, and the right end of the cylindrical pressure head 514 is supported in the circular guide hole 213 adjacent to the rectangular guide hole 212 in the front side plate 211 of the crossbeam, and the cuboid pressure head 513 is close to the main support moving cylinder 31. When the frame is assembled and positioned, the right end of the cuboid pressure head 513 presses on the left end of the guide plate 30 near the crossbeam 21, and the right end of the cylindrical pressure head 514 presses on the right end of the transverse web plate 10 near the crossbeam 21.

[0036] The partition plate clamping cylinder assembly 52 includes a partition plate clamping cylinder 521, a partition plate pressing head 522, and a partition plate pressing head guide frame 523. The left end of the partition plate clamping cylinder 52 is horizontally fixed on the right end of the partition plate pressing head guide frame 523. The output end of the partition plate clamping cylinder 521 is connected to the right end of the partition plate pressing head 522. The middle part of the partition plate pressing head 522 is supported in the guide hole 524 of the partition plate pressing head guide frame 523. The bottom of the partition plate pressing head guide frame 523 is fixed on the rear center of the assembly workbench 1. When the frame single piece 100 is assembled and positioned, the right end of the partition plate pressing head 522 presses on the right end of the partition plate 20 away from the crossbeam 21.

[0037] The transverse web-guide plate rear clamping cylinder assembly 53 includes two rear clamping cylinders 531, a first guide post 532, a second guide post 533, and a double guide frame 534. The left ends of the horizontally arranged rear clamping cylinders 531 are fixed to the middle of the double guide frame 534. The output ends of the rear clamping cylinders 531 are fixedly connected to the left ends of the first guide post 532 and the second guide post 533, respectively. The middle parts of the first guide post 532 and the second guide post 533 are supported in the corresponding guide holes of the double guide frame 534. The bottom of the double guide frame 534 is fixed to the rear sides of the assembly workbench 1. The diameter of the first guide post 532 is larger than the diameter of the second guide post 533, and the first guide post 532 is located on the inner side of the assembly workbench 1 of the double guide frame 534 near the middle partition clamping cylinder 521. When the frame piece 100 is assembled and positioned, the left end of the first guide post 532 and the left end of the second guide post 533 press on the base plate 40 respectively, and the base plate 40 is perpendicularly abutted against the right end of the transverse web plate 10 away from the transverse beam 21.

[0038] The transverse positioning device 6 is located on the inner side of the longitudinal beams 22 at both ends of the main support 2, and includes a swing arm 61 and two swing rods 62. The hinge joint 611 extending transversely from the middle of the swing arm 61 extends into the right end of the longitudinal beam 22 and is hinged to the right end of the longitudinal beam 22. The middle part of the swing rods 62 is hinged to one end of the swing arm 61, and the end of the swing rod 62 near the adjacent transverse web inclined edge 101 is hinged to the guide wheel 63. When the various plates of the frame piece 100 are assembled and positioned, the guide wheels 63 abut against the upper and lower sides of the adjacent transverse web inclined edge 101, which facilitates the pushing of the transverse webs 10 on both sides of the frame piece, so that the two sides of the frame piece 100 are clamped and positioned.

[0039] A method for assembling a single piece of frame for a marine diesel engine, comprising the following steps:

[0040] 1) Before assembling the frame piece 100, first move the two sets of longitudinally arranged guide plate grooves 44 outward along the transverse linear guide rail 452 towards the longitudinal edges of the assembly workbench 1, so that the center distance between the two rows of guide plate grooves 44 is increased to be greater than the width of the partition plate 20. Then hoist the guide plate 30 and insert the guide plate 30 vertically into the upper slot 441 of the corresponding guide plate groove. Next, hoist the partition plate 20 onto the two spaced partition plate support seats 41 at the longitudinal center of the assembly workbench 1. Then, hoist the transverse web plate 10 onto the front support seat 42 and the two transverse web plate support seats 43 at the corresponding positions. Finally, hoist the bottom plate 40 vertically between the bottom of the transverse web plate 10 and the first guide column 532 and the second guide column 533 to complete the hoisting of each plate of the frame piece 100.

[0041] 2) First, activate the main support moving cylinder 21. The piston rod 311 of the main support moving cylinder pushes both ends of the crossbeam 21 of the main support 2 along a pair of main support moving linear guide rails 34 towards the left end of the middle partition, the two transverse webs, and the two guide plates. The swing arms 61 on the inner side of the longitudinal beams 22 at both ends of the main support 2 move towards the corresponding transverse web inclined side 101. When the guide wheel 63 at the end of the right swing rod 62 of the swing arm 61 abuts against the lower side of the corresponding transverse web inclined side 101, the guide wheel 63 at the end of the left swing rod 62 of the swing arm 61 automatically abuts against the upper side of the transverse web inclined side 101. The main support 2 continues to move to the right. The horizontal and vertical components of the force between the guide wheels 63 at both ends of the swing arm 61 and the transverse web inclined side 101 push the transverse web 10 to move longitudinally and simultaneously move laterally towards the guide plate 30. The piston rod 311 of the main support moving cylinder continues to push the main support 2 to the right, and the gap between the transverse web plate 10 and the guide plate 30, as well as the gap between the guide plate 30 and the two sides of the middle partition plate 20, continuously decrease until the guide plate 30 abuts against the two sides of the middle partition plate 20 after the transverse movement, thus completing the transverse positioning of each plate of the frame single piece 100.

[0042] 3) After the piston rod 311 of the main support moving cylinder stops extending and retracts, two sets of front clamping cylinders 511, the middle partition clamping cylinder 521, and two sets of rear clamping cylinders 531 are simultaneously activated. The cuboid pressure head 513 and the cylindrical pressure head 514 move outward respectively. The middle partition pressure head 522, the first guide column 532, and the second guide column 533 also move outward to press against the guide plate 30, the middle partition 20, the transverse web plate 10, and the bottom plate 40, so that the transverse web plate 10 presses against the corresponding bottom plate 40. The guide plate 30, the middle partition 20, and the transverse web plate 10 remain flush with the left end of the crossbeam 21. At this time, the front clamping cylinder 511, the middle partition clamping cylinder 521, and the rear clamping cylinder 531 are all in a pressure-holding state, with a pressure holding oil pressure of 8-10 MPa.

[0043] 4) Measure the main dimensions of frame piece 100, the relative positions of each plate, and the overall shape of frame piece 100 according to the design requirements. Then spot weld each plate together to form a frame piece welded blank. Finally, retract the piston rods of each cylinder and unload the frame piece welded blank.

[0044] 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 single-piece assembly fixture for a marine diesel engine frame, characterized in that, The system includes an assembly workbench, a main support, a main support moving device, a welding plate support device, a longitudinal clamping device, and a transverse positioning device. The main support is a steel box girder structure, including a crossbeam and two longitudinal beams. The length of the crossbeam is greater than the width of the assembly workbench. One end of each longitudinal beam is perpendicularly fixed to both ends of the crossbeam to form a horizontally oriented main support. The middle part of the transverse positioning device is hinged to the other end of each longitudinal beam. The main support moving device includes a main support moving cylinder, a main support moving cylinder support, two pairs of crossbeam supports, and a pair of main support moving linear guides. One end of the horizontally arranged main support moving cylinder is fixed on the main support moving cylinder support. The bottom of the main support moving cylinder support is fixed on the longitudinal center of one end of the assembly workbench and is located on the outside of the crossbeam. One end of the piston rod of the main support moving cylinder is fixed on the center of the outer side of the crossbeam through a connecting plate. The pairs of crossbeam supports are respectively vertically fixed on both ends of the inner and outer sides of the crossbeam. The bottom of the crossbeam supports is supported on both sides of one end of the assembly workbench through the main support moving linear guides parallel to the longitudinal center of the assembly workbench. The welding plate support device includes two longitudinally spaced partition plate support seats arranged at the longitudinal center of the assembly workbench, a pair of front support seats arranged on both sides of the partition plate support seats near the crossbeam, four transverse web plate support seats arranged in a rectangular shape in the middle of the assembly workbench, and four guide plate grooves arranged in a rectangular shape symmetrically on both sides of the front and rear partition plate support seats. The four guide plate grooves are arranged longitudinally into two groups. The bottom of the front support seat, the partition plate support seat, and the transverse web plate support seat are fixed to the assembly workbench. The lower part of the guide plate groove is supported on the assembly workbench by a transverse linear guide rail. The two ends of the partition plate are supported on the partition plate support seats, and the two ends of the transverse web plate are supported on the front support seat and the two longitudinally spaced transverse web plate support seats. The lower part of the guide plate, which is vertically arranged between the adjacent sides of the transverse web plate and the partition plate, is embedded in the guide plate groove. The longitudinal clamping device includes two sets of front clamping cylinder assemblies, one set of middle partition plate clamping cylinder assemblies, and two sets of transverse web plate-guide plate rear clamping cylinder assemblies. The front clamping cylinder assemblies are symmetrically arranged on the middle of the crossbeam and are adjacent to one end of the transverse web plate and one end of the guide plate on both sides of the frame piece. One set of middle partition plate clamping cylinder assemblies is arranged at the rear of the longitudinal center of the assembly workbench and is adjacent to the end of the middle partition plate of the frame piece away from the crossbeam. The two sets of transverse web plate-guide plate rear clamping cylinder assemblies are respectively arranged on both sides of the rear end of the assembly workbench and are adjacent to the other end of the transverse web plate and the bottom plate on both sides of the frame piece. The lateral positioning device includes a swing arm and two swing rods. The hinge joint extending laterally from the middle of the swing arm extends into the other end of the longitudinal beam and is hinged to the other end of the longitudinal beam. The middle part of the swing rod is hinged to one end of the swing arm, and the end of the swing rod near the adjacent hypotenuse of the transverse web plate is hinged to the guide wheel. When the individual plates of the frame are assembled and positioned, the guide wheels abut against the hypotenuse of the adjacent transverse web plate.

2. The single-piece assembly fixture for the marine diesel engine frame as described in claim 1, characterized in that, The diaphragm support, front support, and transverse web support are all welded steel plate components. The diaphragm support is H-shaped, the front support is strip-shaped, and the transverse web support is a rectangular frame. Wear-resistant plates are fixed to the top surfaces of the diaphragm support, front support, and transverse web support.

3. The single-piece assembly tooling for the marine diesel engine frame as described in claim 1, characterized in that, The guide plate groove is inverted Π shape. The upper groove opening matches the thickness of the guide plate. The two ends of the support plate at the bottom of the guide plate groove are respectively fixed to the slider of the transverse linear guide rail on the transverse linear guide rail body. The transverse linear guide rail body is respectively fixed in the rectangular sink in the middle of the assembly workbench.

4. The single-piece assembly fixture for the marine diesel engine frame as described in claim 1, characterized in that, The front clamping cylinder assemblies are located on both sides of the main support moving cylinder. Each front clamping cylinder assembly includes two front clamping cylinders, a front clamping cylinder mounting plate, a cuboid pressure head, and a cylindrical pressure head. The two front clamping cylinders arranged side by side are horizontally fixed to the middle of the crossbeam by the front clamping cylinder mounting plate. The output end of one front clamping cylinder is connected to one end of the cuboid pressure head, and the other end of the cuboid pressure head is supported in the rectangular guide hole of the front side plate of the crossbeam. The output end of the other front clamping cylinder is connected to one end of the cylindrical pressure head, and the other end of the cylindrical pressure head is supported in the circular guide hole adjacent to the rectangular guide hole of the front side plate of the crossbeam, and the cuboid pressure head is close to the main support moving cylinder. When the frame is assembled and positioned, the other end of the cuboid pressure head presses on the end of the guide plate close to the crossbeam, and the other end of the cylindrical pressure head presses on the end of the cross web plate close to the crossbeam.

5. The single-piece assembly fixture for the marine diesel engine frame as described in claim 1, characterized in that, The partition plate clamping cylinder assembly includes a partition plate clamping cylinder, a partition plate pressure head, and a partition plate pressure head guide frame. One end of the partition plate clamping cylinder is horizontally fixed on one end of the partition plate pressure head guide frame. The output end of the partition plate clamping cylinder is connected to one end of the partition plate pressure head. The middle part of the partition plate pressure head is supported in the guide hole of the partition plate pressure head guide frame. The bottom of the partition plate pressure head guide frame is fixed on the center of the rear of the assembly workbench. When the frame is assembled and positioned, the other end of the partition plate pressure head presses on the end of the partition plate away from the crossbeam.

6. The single-piece assembly fixture for the marine diesel engine frame as described in claim 1, characterized in that, The rear clamping cylinder assembly of the transverse web plate-guide plate includes two rear clamping cylinders, a first guide column, a second guide column, and a double guide frame. One end of each of the horizontally arranged rear clamping cylinders is fixed to the middle of the double guide frame. The output end of each rear clamping cylinder is fixedly connected to one end of the first guide column and one end of the second guide column. The middle parts of the first and second guide columns are supported in the corresponding guide holes of the double guide frame. The bottom of the double guide frame is fixed to the rear sides of the assembly workbench. The diameter of the first guide column is larger than that of the second guide column, and the first guide column is located on the inner side of the assembly workbench of the double guide frame near the clamping cylinder of the middle partition plate. When the frame is assembled and positioned, the other end of the first guide column and the other end of the second guide column press against the base plate. The base plate is vertically abutted against the other end of the transverse web plate away from the crossbeam.

7. A method of using the single-piece assembly tooling for the marine diesel engine frame as described in claim 1, characterized in that, Includes the following steps: 1) Before assembling the frame pieces, move the two sets of longitudinally arranged guide plate slots outward along the transverse linear guide rails towards the longitudinal edges of the assembly workbench, so that the center distance between the two rows of guide plate slots is increased to be greater than the width of the partition plate; then hoist the guide plates and insert them vertically into the upper slots of the corresponding guide plate slots; then hoist the partition plate onto the two spaced partition plate support seats at the longitudinal center of the assembly workbench; then hoist the transverse web plates onto the corresponding front support seats and the two transverse web plate support seats; finally, hoist the bottom plate vertically between the bottom of the transverse web plate and the first guide column and the second guide column to complete the hoisting of each piece of the frame piece. 2) First, start the main support moving cylinder. The piston rod of the main support moving cylinder pushes the two ends of the main support beam to move along a pair of main support moving linear guide rails towards the middle partition, the two transverse webs and one end of the two guide plates. The swing arms on the inner side of the longitudinal beams at both ends of the main support move towards the corresponding transverse web inclined side. When the guide wheel at the end of the swing arm abuts against the lower side of the corresponding transverse web inclined side, the guide wheel at the end of the swing arm automatically abuts against the upper side of the transverse web inclined side. The main support continues to move. The horizontal and vertical components of the force between the guide wheels at both ends of the swing arm and the transverse web inclined side push the transverse web to move longitudinally and also move laterally towards the guide plate. The piston rod of the main support moving cylinder continues to push the main support to move. The gap between the transverse web and the guide plate, as well as the gap between the guide plate and the two sides of the middle partition, continuously decrease until the guide plate abuts against the two sides of the middle partition after lateral movement, completing the lateral positioning of each plate of the frame. 3) After the piston rod of the main support moving cylinder stops extending and retracts, two sets of front clamping cylinders, the middle partition clamping cylinder, and two sets of rear clamping cylinders are simultaneously activated. The cuboid pressure head and the cylindrical pressure head move outwards respectively. The middle partition pressure head, the first guide post, and the second guide post also move outwards to press against the guide plate, the middle partition, the transverse web plate, and the bottom plate, so that the transverse web plate presses against the corresponding bottom plate. The guide plate, the middle partition, and the transverse web plate remain flush with the end near the crossbeam. At this time, the front clamping cylinder, the middle partition clamping cylinder, and the rear clamping cylinder are all in a pressure-holding state, with a pressure holding oil pressure of 8-10 MPa. 4) Measure the main dimensions of each frame piece, the relative positions of each plate, and the overall shape of the frame piece according to the design requirements. Then, spot weld each plate together to form a frame piece weldment blank. Finally, retract the piston rods of each cylinder and unload the frame piece weldment blank.

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