Welding auxiliary device and welding method for the plate grid frame of a super flow guide pipe

Abstract

An auxiliary device and welding method for the grid frame welding of a super flow guide pipe, comprising a positioning and installation platform and a central cylinder support assembly. A boss is provided on the positioning and installation platform. The central cylinder support assembly includes a base ring and a central cylinder body welded above the outer peripheral edge of the base ring. A plurality of positioning holes are provided on the central cylinder body, and pins for positioning the axial rib plates are arranged in the positioning holes. It also includes a positioning and supporting device for assisting in positioning the axial rib plates, a circumferential rib plate height maintaining frame for controlling the height of adjacent circumferential rib plates, and a connecting flange pressing assembly for pressing the connecting flange against the positioning and installation platform. It can not only meet the manufacturing accuracy of the grid frame, but also greatly improve the production efficiency, achieve a 100% product yield rate, reduce the requirements for personnel capabilities in the manufacturing process, save costs, and increase economic benefits.

Description

Technical Field

[0001] The present invention belongs to the technical field of shipbuilding, and specifically relates to a plate grid frame welding auxiliary device and a welding method for a super fairwater duct. Background Art

[0002] As a new type of hydrodynamic energy-saving additional device, the super fairwater duct is an improvement over the ordinary fairwater duct. Compared with the ordinary fairwater duct, the super fairwater duct has a better energy-saving and drag-reducing effect. Compared with the shape of the ordinary fairwater duct, there are mainly the following differences: 1. Position: The ordinary fairwater duct is installed immediately in front of the propeller, and there is a certain distance between the super fairwater duct and the propeller. 2. Diameter: The diameter of the ordinary fairwater duct is equivalent to that of the propeller, and the diameter of the super fairwater duct is much smaller than that of the propeller.

[0003] The super fairwater duct is installed in front of the propeller (collectively called the ducted propeller with the propeller) and has a certain distance from the ship's propeller. When the oncoming flow passes through the super fairwater duct from the bow direction, it first passes through the leading edge of the airfoil of the super fairwater duct. Its airfoil can greatly reduce the separation phenomenon of the trailing vortex. At the same time, the lift generated by each airfoil section can be aggregated into the thrust of the ship. These two factors can not only reduce the driving resistance of the ship, but also improve the propeller inflow to make it more uniform.

[0004] According to the different hull tail structures and hull lines, the matching super fairwater ducts are divided into two types: fixed super fairwater ducts and rotating super fairwater ducts. The fixed super fairwater duct is directly welded to the hull structure, and the rotating fairwater duct is driven by a rotating mechanism and can rotate relative to the hull and can also be used as a rudder. Due to the simple structure and energy-saving and drag-reducing characteristics of this new type of super fairwater duct, it has broad application prospects in large and medium-sized ships on the water surface.

[0005] However, the super fairwater duct is welded from complex space curves, and welding deformation is exactly the most influential and difficult-to-control part in the manufacture of the super fairwater duct, especially the welding of curved plates, and its deformation situation is more difficult to control. Since the welding result of curved plates often deviates more from the dimensional accuracy requirements of the design drawing compared with flat plate welding, during the welding process of curved plates, the control level of welding stress and strain greatly affects the quality and production efficiency of the super fairwater duct.

[0006] With the development of ship propellers towards higher power, higher performance and stronger environmental adaptability, the trend of large-scale, lightweight and high-strength of super fairwater ducts is becoming increasingly prominent, and its requirements for high forming accuracy and high fatigue resistance of welding manufacturing are also getting higher and higher. Conducting research on high forming accuracy auxiliary devices and welding processes will lay a technical foundation for the upgrade and development of super fairwater ducts in ship propellers in China.

[0007] The new type of super fairwater, as an important part of the ducted propeller, includes a super fairwater body and an annular plate grid frame welded to the outer periphery of the fairwater body. The manufacturing of the annular plate grid frame ( Figure 1 and Figure 2 as shown in one of the schematic diagrams of its type) is the most core link in the manufacturing of the super fairwater. The annular plate grid frame is composed of axial rib plates 18 welded to the outer periphery of the fairwater body, circumferential rib plates 19, and circumferential connection flanges (hereinafter referred to as connection flanges) 20 connected to one end of the axial rib plates 18. Among them, the axial rib plates 18 are continuous up and down and are evenly spaced. The circumferential rib plates 19 are segmentally connected between adjacent axial rib plates. In the fairwater assembly (i.e., the ducted propeller), the installation of the propeller and the fairwater body is relatively close. The propeller needs to be coaxial with the center line of the fairwater body and is located at the minimum cross-section of the fairwater body. At the same time, the gap between the end of the propeller blade and the inner diameter of the fairwater body at the installation position should be minimized, generally not exceeding 0.5% of the diameter of the fairwater body itself or 1 cm.

[0008] To ensure the matching with the hull, it is required that the annular plate grid frame is light in weight. Usually, a plate welding structure is selected as the annular plate grid frame. To ensure the fitting and installation of the annular plate grid frame with components such as the rear hub and upper and lower supports in the later stage, as well as the uniform stress of the annular plate grid frame structure during the working process and the centering requirement with the axis of the ship propeller in front of the fairwater, the overall manufacturing accuracy requirements for the structure of the annular plate grid frame are relatively high.

[0009] In the prior art, the overall product accuracy is mainly ensured by welding processes and highly skilled welding technicians. However, affected by factors such as the operator's level, temperature, and humidity, the product quality stability is poor, the manufacturing cycle is long, and even the situation of product scrapping occurs, bringing certain losses to the enterprise. Summary of the Invention

[0010] The purpose of the present invention is to provide a welding auxiliary device and a welding method for the plate grid frame of a super fairwater.

[0011] To achieve the above object, the technical solution adopted by the present invention is as follows: A welding auxiliary device for the grid frame of a super flow guide tube, comprising a positioning and installation platform and a central tube support assembly. A boss is provided on the positioning and installation platform. The central tube support assembly includes a base ring that is fitted and installed with the outer circumference of the boss, and a central tube body welded above the outer peripheral edge of the base ring. The outer shape and size of the central tube body are consistent with those of the outer circumference of the flow guide tube body. The outer circumference of the base ring matches the inner circumference of the connecting flange; A plurality of positioning holes are provided on the central tube body, and a pin for positioning the axial rib plate is provided in the positioning holes; It also includes a positioning support device for assisting in positioning the axial rib plate, a circumferential rib plate height maintaining frame for controlling the height of adjacent circumferential rib plates, and a connecting flange pressing assembly for pressing the connecting flange onto the positioning and installation platform.

[0012] Further, a plurality of positioning holes are uniformly arranged along the axial direction in multiple circles, and the center lines of each circle of positioning holes are located in the same plane and intersect with the axis line of the central tube body.

[0013] Further, the pin is cylindrical. The pin is inserted into the positioning hole from the inside of the central tube body, and a clamping groove for clamping the axial rib plate is provided at one end extending outside the central tube body. The depth of the clamping groove is not less than the length of the pin extending outside the central tube body, and the width of the clamping groove is consistent with the width of the axial rib plate.

[0014] Further, the positioning support device includes a lower positioning support assembly. The lower positioning support assembly includes a lower pillar that can be detachably connected to the positioning and installation platform and a pin unit block. One end of the pin unit block is detachably and fixedly connected to the upper end of the lower pillar, and the other end is provided with a clamping groove A for clamping the axial rib plate. A protrusion is provided on the pin unit block, and a threaded hole penetrating both end faces of the protrusion is provided on the protrusion. The center line of the threaded hole falls on the symmetry center plane of the clamping groove A, and an axial rib plate tightening bolt is installed in the threaded hole.

[0015] Further, the positioning support device includes an upper positioning support assembly. The upper positioning support assembly includes an upper pillar and an annular clamping ring. The lower end of the upper pillar can be detachably connected to the positioning and installation platform. The upper end of the upper pillar is threadedly sleeved with a positioning nut and a pressing nut. The inner circumference of the clamping ring is fitted and installed with the outer circumference of the axial rib plates of the entire grid frame. The clamping ring is sleeved between the positioning nut and the pressing nut through a clamping hole provided thereon.

[0016] Further, the circumferential rib plate height maintaining frame includes two vertical plates with parallel plate surfaces and a horizontal plate with parallel plate surfaces connected between the two vertical plates. The heights of the two vertical plates are consistent with the distance between two adjacent upper and lower circumferential rib plates.

[0017] Further, the connecting flange pressing assembly includes a pressing plate. One end of the pressing plate is fixed on the positioning and installation platform through a fixing member. A threaded hole is provided at the free end of the pressing plate, and a flange pressing bolt for pressing the connecting flange is provided in the threaded hole.

[0018] Further, the positioning and installation platform includes a flat plate and an annular reinforcing rib provided on the lower side of the flat plate. The boss is provided in the middle of the positioning and installation platform, and a central circular hole is provided in the middle of the boss.

[0019] Further, the central cylinder body includes a hollow cylinder and an annular reinforcing plate provided on the inner surface of the hollow cylinder.

[0020] A method for welding a plate grid frame by using a plate grid frame welding auxiliary device of a super flow guide pipe, characterized by comprising the following steps:

[0021] 1) Place the connecting flange in the plate grid frame product on the upper plane of the positioning and installation platform;

[0022] 2) Place the central cylinder support assembly on the periphery of the boss of the positioning and installation platform, so that the base ring is fitted and installed with the outer circumference of the boss, and fix the connection between the central cylinder support assembly and the positioning and installation platform;

[0023] 3) Use the pressing plate to press the connecting flange on the positioning and installation platform;

[0024] 4) Insert the pin into the positioning hole of the central cylinder support assembly;

[0025] 5) Vertically place the axial rib plate in the plate grid frame product on the upper plane of the connecting flange. The inner end face of the axial rib plate is inserted into the card slot in the pin and is attached to the outer wall of the central cylinder body in the central cylinder support assembly;

[0026] 6) Connect the lower strut in the lower positioning support assembly to the positioning and installation platform, connect the pin unit block to the upper end of the lower strut, and tighten the corresponding end of the pin unit block with the lower strut; The axial rib plate tightening bolt cooperates with the threaded hole on the protruding part of the pin unit block to tighten the outer end face of the lower part of the axial rib plate;

[0027] 7) Fix the connection between the upper strut in the upper positioning support assembly and the positioning and installation platform, fit and install the positioning nut with the upper strut, then install the snap ring, and use the tightening nut to tighten the snap ring;

[0028] 8) Repeat steps 5)-7) to install each axial rib plate in turn;

[0029] 9) Place a layer of height retainer on the upper end face of the connecting flange, and then place a layer of circumferential rib plate on the upper plane of the height retainer, and so on, to install the remaining circumferential rib plates and height retainers;

[0030] 10) Use the top-down welding method to weld the contact areas between each circumferential rib plate and the axial rib plate, as well as between each axial rib plate and the connecting flange; then turn the entire auxiliary device upside down and use the top-down welding method to weld the other side of the contact areas between each circumferential rib plate and each axial rib plate.

[0031] 11) Finally, disassemble the positioning support device, height retainer, pressure plate, bayonet, center tube support assembly, etc. in sequence for use in welding the next plate grid frame product.

[0032] Beneficial effects:

[0033] 1. The present invention can not only meet the production accuracy of the plate grid frame, but also greatly improve the production efficiency:

[0034] The present invention can accurately position and reliably clamp the axial ribs, circumferential ribs and connecting flanges, thereby effectively reducing the deformation of the plate grid frame during welding to ensure the accuracy requirements of the welding frame (including the spacing requirements between the axial ribs and the circumferential ribs, the requirements for the thickness center line of each axial rib to pass through the axial center line of the annular plate grid frame, the verticality requirements between the axial ribs and the connecting flanges, the flatness and thickness requirements of the connecting flanges, the parallelism requirements between the circumferential rib plane and the connecting flange plane, etc.), and can also facilitate posture adjustments such as flipping during welding (during the welding process, the upper and lower planes between the circumferential ribs and the axial ribs need to be welded. Compared with welding with the head raised or even welding on the ground, the quality of the weld is best when the operator looks down. At the same time, the operator is more comfortable in the top-down welding method. Therefore, when welding the product, Figure 2 For example, after the product is welded with the large mouth facing upwards, it can be turned upside down and welded with the small mouth facing upwards on the other side between the circumferential rib plate and the axial rib plate. In this way, the operator can look down at the welding during the entire welding process, the weld quality is good, and the operator is comfortable).

[0035] 2. The present invention can ensure production safety and greatly simplify the technical requirements of welding process. It can not only effectively control welding deformation, but also greatly reduce welding costs and bring higher economic benefits to enterprises:

[0036] Welding is a thermal change process with highly concentrated local heat sources. Different welding processes and sequences will not only lead to different temperature changes and deformation results, but also affect the molten pool holes during welding, thus affecting the welding quality. In the prior art, the deformation control of welded structures is mainly considered from two aspects: one is the welding process and sequence, and the other is the welding deformation control auxiliary device.

[0037] The present invention relates to a product with a relatively large overall size. The total tonnage of the finished product reaches 55 tons, and the price of a single product is close to ten million. In the prior art, the overall product accuracy is mainly ensured through welding processes and highly skilled welding technicians. However, affected by factors such as the operator's level, temperature, and humidity, the product quality stability is poor, the manufacturing cycle is long, and even product scrapping occurs, causing certain losses to the enterprise. After adopting the device and method of the present invention, the currently manufactured products have good consistency, relatively stable product quality, are no longer demanding on the operator's level, the manufacturing cycle is shortened to 1 / 2 of the original, and the product qualification rate of the finished product reaches 100%. At present, mass production has been achieved. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 It is a top view of one of the plate grid frameworks.

[0039] Figure 2 is Figure 1 the A-A cross-sectional view of.

[0040] Figure 3 It is a full cross-sectional view of the application state of the auxiliary tooling of the present invention.

[0041] Figure 4 It is a comparison diagram of the half-section and partial side view of the auxiliary tooling of the present invention.

[0042] Reference numerals in the drawings: 1, positioning and installation platform; 101, flat plate; 102, circular reinforcing rib; 103, central circular hole; 2, stud; 3, compression plate fixing nut; 4, compression plate; 5, flange pressing bolt; 6, lower support pillar; 7, end tightening bolt; 8, chuck unit block; 9, axial rib plate tightening bolt; 10, chuck; 11, circumferential rib plate height maintaining frame; 12, positioning nut; 13, snap ring; 14, compression nut; 15, upper support pillar; 16, central cylinder support assembly; 16a, base ring; 16b, central cylinder body; 16b-1, hollow cylinder; 16b-2, annular reinforcing plate; 17, base ring fixing bolt; 18, axial rib plate; 19, circumferential rib plate; 20, connecting flange. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0043] The present invention will be further described in detail below in conjunction with the drawings and embodiments, but it is not used as a basis for any limitation to the invention.

[0044] As shown in the accompanying drawings, a plate grid frame welding auxiliary device for a super flow guide tube includes a positioning and installation platform 1 and a central cylinder support assembly 16. There is a boss on the positioning and installation platform. The central cylinder support assembly includes a base ring 16a that fits and installs with the outer circumference of the boss and a central cylinder body 16b whose lower end is welded above the outer peripheral edge of the base ring. The outer shape and dimensions of the central cylinder body 16b are consistent with those of the outer circumference of the flow guide tube body. The outer circumference of the base ring can match the inner circumference of the connecting flange.

[0045] In this embodiment, the lower part of the outer circumference of the base ring matches the inner circumference of the connecting flange, and the upper part of the outer circumference of the base ring matches the inner curved surface at the lower end of the axial rib plate.

[0046] In this embodiment, the outer shape of the central cylinder body 16b is a conical tube, which is consistent with the outer shape of the conical flow guide tube in the type of flow guide tube. The present invention can not only be used to manufacture a flow guide tube in the shape of a conical tube, but also be used to manufacture a plate grid frame of a flow guide tube in other shapes such as an X shape.

[0047] There are multiple rows of positioning holes arranged circumferentially on the central cylinder body 16b. The number of rows of positioning holes is the same as the number of axial rib plates of the plate grid frame. There are pins 10 for positioning the axial rib plates in the positioning holes; it also includes a positioning support device for assisting in positioning the axial rib plates, a circumferential rib plate height maintaining frame for controlling the height of adjacent circumferential rib plates, and a connecting flange pressing assembly for pressing the connecting flange onto the positioning and installation platform.

[0048] Specifically, in this embodiment, the positioning and installation platform 1 includes a flat plate 101 and an annular reinforcing rib 102 provided on the lower side of the flat plate.

[0049] The boss is provided in the middle of the positioning and installation platform 1, and there is a central circular hole 103 in the middle of the boss.

[0050] The base ring 16a is fixedly connected to the positioning and installation platform 1 through base ring fixing bolts 17.

[0051] To ensure sufficient supporting force, the central cylinder body 16b includes a hollow cylinder 16b-1 and an annular reinforcing plate 16b-2 provided on the inner surface of the hollow cylinder.

[0052] Multiple positioning holes are uniformly arranged axially in multiple circles (also called multiple rows). The center lines of each circle of positioning holes are in the same plane and all intersect with the axis line of the central cylinder body.

[0053] In this embodiment, the latch pin 10 is cylindrical, and there is a small clearance fit between the latch pin 10 and the positioning hole, enabling one end of the latch pin 10 to be clamped inside the positioning hole. The latch pin 10 is inserted into the positioning hole from inside the central cylinder body 16b, and a card slot for clamping the axial rib plate 18 is provided at one end extending outside the central cylinder body 16b. The depth of the card slot is not less than the length of the latch pin 10 extending outside the central cylinder body, and the width of the card slot is the same as the width of the axial rib plate 18.

[0054] In this embodiment, the axial rib plate is positioned by three rows of latch pins, that is, there are 3 latch pins in one column corresponding to each axial rib plate 18. Since the depth of the card slot is not less than the length of the latch pin 10 extending outside the central cylinder body, after the axial rib plate 18 is clamped in the 3 latch pins, the inner curved surface of the axial rib plate can be attached to the outer circumferential surface of the central cylinder support assembly 16 where it is located.

[0055] The positioning and supporting device is used to press on the outer end face of the axial rib plate 18, so that the inner curved surface of the axial rib plate 18 is completely attached to the outer circumferential surface of the central cylinder body of the central cylinder support assembly 16; to prevent the axial rib plate 18 from deforming or shaking during welding.

[0056] The positioning and supporting device can adopt the technical solution of the lower positioning and supporting component or the upper positioning and supporting component or a combination of both. The upper and lower parts are for the convenience of description and do not limit the structure of the technical solution itself.

[0057] The lower positioning and supporting component includes a lower pillar 6 that can be detachably connected to the positioning and installation platform and a latch pin unit block 8. One end of the latch pin unit block is detachably and fixedly connected to the upper end of the lower pillar, and the other end is provided with a card slot A for clamping the axial rib plate. A protrusion is provided on the latch pin unit block 8, and a threaded hole penetrating both end faces of the protrusion is provided on the protrusion. The center line of the threaded hole falls on the symmetric center plane of the card slot A, and an axial rib plate tightening bolt 9 is installed in the threaded hole.

[0058] Specifically, the lower pillar 6 can adopt a structure with a threaded bolt end at one end and a stepped shaft at the other end. It is fixedly connected to the positioning and installation platform 1 through the bolt end, and the other end is installed in the shaft hole of the latch pin unit block 8 through the stepped shaft. The latch pin unit block 8 is fixed to the lower pillar 6 through an end tightening bolt 7. The width of the card slot A in the latch pin unit block 8 is the same as the plate thickness of the axial rib plate 18.

[0059] The center line of the threaded hole on the protrusion preferably falls on the symmetric center plane of the card slot A and is perpendicular to the center line of the shaft hole of the latch pin unit block 8, so that the axial rib plate tightening bolt 9 can ensure that the direction of the tightening force does not deviate during the process of tightening the axial rib plate.

[0060] The positioning and supporting device described above includes an upper positioning and supporting assembly. The upper positioning and supporting assembly includes an upper pillar 15 and an annular retaining ring 13. The lower end of the upper pillar 15 can be detachably connected to the positioning and installation platform. The upper end of the upper pillar 15 is sleeved with a positioning nut 12 and a compression nut 14 through threads. The inner circumference of the retaining ring 13 is fitted and installed with the outer circumference of the axial rib plate of the entire plate grid frame. The retaining ring 13 is sleeved on the upper pillar 15 through the card holes provided thereon and is located between the positioning nut 12 and the compression nut 14.

[0061] In this embodiment, due to the technical solution of combining the lower positioning and supporting assembly and the upper positioning and supporting assembly, the upper pillar 15 is longer than the lower pillar 6, so that it can support the upper part of the axial rib plate.

[0062] In this embodiment, both ends of the upper pillar 15 are threaded ends. One end is fixedly connected to the positioning and installation platform through threads, and the other end is installed with a positioning nut 12, a compression nut 14 and a retaining ring 13.

[0063] The circumferential rib plate height holder 11 described above includes two vertical plates with parallel plate surfaces and a horizontal plate with parallel plate surfaces connected between the two vertical plates. The heights of the two vertical plates are consistent with the predetermined distance between two adjacent circumferential rib plates.

[0064] The circumferential rib plate height holders 11 can be independent of each other and placed between two adjacent layers of circumferential rib plates one by one in sequence, or a plurality of adjacent circumferential rib plate height holders can be connected into a whole and placed at their respective required positions at one time.

[0065] In this embodiment, the connecting flange compression assembly includes a pressing plate 4. One end of the pressing plate 4 is fixed to the positioning and installation platform 1 through a fixing member, a double-headed bolt 2. One end of the double-headed stud 2 is threadedly connected to the positioning and installation platform 1, and the other end is fitted and installed with a pressing plate fixing nut 3.

[0066] The free end of the pressing plate 4 is provided with a threaded hole, and a flange pressing bolt 5 for pressing the connecting flange 20 is provided in the threaded hole.

[0067] Refer to Figure 4 , the process of welding the plate grid frame of the super flow guide tube using this embodiment is as follows:

[0068] 1), Place the connecting flange 20 in the product composition of the plate grid frame on the upper plane of the positioning and installation platform 1.

[0069] Because in this embodiment, the overall shape of the super flow guide cylinder is a conical tube. During welding, the small end of the plate grid frame faces downwards, and the connecting flange 20 is at the small end. Therefore, it is necessary to place the connecting flange 20 first so as to place the central cylinder support assembly 16 subsequently.

[0070] 2), Place the central cylinder support assembly 16 (without inserting the pin 10 yet) around the periphery of the boss on the positioning and installation platform 1, such that the base ring 16a is fitted with the outer circumference of the boss (simultaneously, the inner circumference of the connecting flange 20 is in close fit with the outer circumference of the base ring), and use the base ring fixing bolts 17 to fixedly connect the central cylinder support assembly 16 and the positioning and installation platform 1.

[0071] 3), Use the pressing plate 4 to press the connecting flange against the positioning and installation platform 1.

[0072] 4), Insert the pin 10 into the positioning hole of the central cylinder support assembly 16.

[0073] 5), Vertically place the axial rib plate 18 in the product composition of the plate grid frame on the upper plane of the connecting flange 20. Insert the inner end face of the axial rib plate 18 into the pin 10 and closely fit it with the outer wall of the central cylinder body 16b in the central cylinder support assembly 16.

[0074] 6), Thread-connect the lower pillar 6 in the lower positioning support assembly with the positioning and installation platform 1, connect the pin unit block 8 with the stepped shaft at the upper end of the lower pillar 6, and use the end tightening bolt 7 to tightly press the pin unit block 8 and the corresponding end of the lower pillar 6; The axial rib plate tightening bolt 9 is fitted with the threaded hole on the protruding part of the pin unit block 8 to tightly press the lower outer end face of the axial rib plate 18.

[0075] 7), Thread-connect the upper pillar 15 in the upper positioning support assembly with the positioning and installation platform 1, fit and install the positioning nut 12 with the upper pillar 15, then install the retaining ring 13. The installation of the retaining ring 13 is in contact with the upper surface of the positioning nut 12, and use the pressing nut 14 to press the upper plane of the retaining ring 13.

[0076] By adjusting the heights of the positioning nut 12 and the pressing nut 14 on the upper pillar 15, ensure that the retaining ring 13 tightly presses the upper outer end face of the axial rib plate 18.

[0077] 8), Repeat steps 5)-7) to sequentially install each axial rib plate.

[0078] 9), Place a layer of height retainer 11 on the upper end face of the connecting flange, then place a layer of circumferential rib plate on the upper plane of the height retainer, and so on, to install the remaining circumferential rib plates and height retainers of each layer;

[0079] 10), Use the flat welding method to weld between the contacts of each circumferential rib plate and the axial rib plate and between each axial rib plate and the connecting flange; then turn the entire auxiliary device upside down and use the flat welding method to weld the other side between the contacts of each circumferential rib plate and each axial rib plate.

[0080] 11), Finally, disassemble the positioning support device, height retainer 11, pressure plate 4, pin 10, central cylinder support assembly 16, etc. in sequence for the welding of the next panel frame product.

[0081] Although the present invention is designed for the welding of the panel structure of the super flow guide tube, it can also be applied to the manufacturing and welding of ordinary flow guide tubes as needed.

[0082] The above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit them. Those of ordinary skill in the art should understand that the specific implementation manners of the present invention can be modified or equivalently replaced by referring to the above embodiments. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention is within the scope of protection of the claims pending for approval.

Claims

1. An auxiliary device for welding the plate grid frame of a super diversion pipe, characterized in that: It includes a positioning and installation platform (1) and a central cylinder support assembly (16). There is a boss on the positioning and installation platform. The central cylinder support assembly includes a base ring (16a) that is installed in cooperation with the outer circumference of the boss and a central cylinder body (16b) welded above the outer peripheral edge of the base ring. The outer shape and size of the central cylinder body are consistent with those of the outer circumference of the draft tube body. The outer circumference of the base ring matches the inner circumference of the connecting flange; there are multiple positioning holes on the central cylinder body, and a pin (10) for positioning the axial stiffener is provided in the positioning holes; it also includes a positioning and supporting device for assisting in positioning the axial stiffener, a circumferential stiffener height maintaining frame for controlling the height of adjacent circumferential stiffeners, and a connecting flange pressing assembly for pressing the connecting flange onto the positioning and installation platform; The positioning and supporting device includes a lower positioning and supporting assembly and an upper positioning and supporting assembly. The lower positioning and supporting assembly includes a lower support column (6) that can be detachably connected to the positioning and installation platform and a pin unit block (8). One end of the pin unit block is detachably and fixedly connected to the upper end of the lower support column, and the other end is provided with a slot A for clamping the axial stiffener. There is a protrusion on the pin unit block (8), and a threaded hole penetrating both end faces of the protrusion is opened on the protrusion. The center line of the threaded hole falls on the symmetry center plane of the slot A, and an axial stiffener tightening bolt (9) is installed in the threaded hole; the upper positioning and supporting assembly includes an upper support column (15) and an annular clamping ring (13). The lower end of the upper support column can be detachably connected to the positioning and installation platform. The upper end of the upper support column is threadedly sleeved with a positioning nut (12) and a pressing nut (14). The inner circumference of the clamping ring is installed in cooperation with the outer circumference of the axial stiffeners of the entire plate grid frame. The clamping ring is sleeved between the positioning nut and the pressing nut through the clamping holes provided on it.

2. The welding auxiliary device for the plate grid frame of a super flow guide pipe according to claim 1, characterized in that: The multiple positioning holes are evenly arranged axially in multiple circles, and the center lines of each circle of positioning holes are located in the same plane and all intersect with the axis of the central cylinder body.

3. The welding auxiliary device for the plate grid frame of a super flow guide tube according to claim 2, characterized in that: The pin (10) is cylindrical. The pin is inserted into the positioning hole from the inside of the central cylinder body, and a slot for clamping the axial stiffener (18) is opened at one end extending outside the central cylinder body. The depth of the slot is not less than the length of the pin (10) extending outside the central cylinder body, and the width of the slot is consistent with the width of the axial stiffener (18).

4. An auxiliary device for welding the grid frame of a super flow guide pipe according to any one of claims 1-3, characterized in that: The circumferential stiffener height maintaining frame includes two vertical plates with parallel plate surfaces and a horizontal plate with parallel plate surfaces connected between the two vertical plates. The heights of the two vertical plates are consistent with the distance between two adjacent circumferential stiffeners above and below.

5. An auxiliary device for welding the grid frame of a super flow guide pipe according to any one of claims 1 to 3, characterized in that: The connecting flange pressing assembly includes a pressing plate (4). One end of the pressing plate is fixed to the positioning and installation platform (1) through a fixing member. A threaded hole is provided at the free end of the pressing plate, and a flange pressing bolt (5) for pressing the connecting flange is provided in the threaded hole.

6. The welding auxiliary device for the plate grid frame of a super flow guide tube according to claim 1, characterized in that: The positioning and installation platform includes a flat plate and a circular ring-shaped reinforcing rib provided on the lower side of the flat plate; the boss is provided in the middle of the positioning and installation platform, and a central circular hole is provided in the middle of the boss.

7. An auxiliary device for welding the grid frame of a super diversion pipe according to claim 1, characterized in that: The central cylinder body includes a hollow cylinder and an annular reinforcing plate provided on the inner surface of the hollow cylinder.

8. A method for welding a plate grid frame using the plate grid frame welding auxiliary device of a super draft tube, applying the plate grid frame welding auxiliary device of the super draft tube according to any one of claims 1-7, characterized in that, It includes the following steps: 1), Place the connecting flange (20) in the product composition of the plate grid frame on the upper plane of the positioning and installation platform (1); 2), Place the central cylinder support assembly around the boss of the positioning and installation platform, so that the base ring (16a) is fitted and installed with the outer circumference of the boss, and fix the central cylinder support assembly to the positioning and installation platform; 3), Use the pressure plate (4) to press the connecting flange tightly on the positioning and installation platform; 4), Insert the pin (10) into the positioning hole of the central cylinder support assembly; 5), Vertically place the axial rib plate (18) in the product composition of the plate grid frame on the upper plane of the connecting flange, insert the inner end face of the axial rib plate into the card slot in the pin (10), and make it fit with the outer wall of the central cylinder body (16b) in the central cylinder support assembly; 6), Connect the lower pillar (6) in the lower positioning support assembly to the positioning and installation platform, connect the pin unit block (8) to the upper end of the lower pillar, and press the pin unit block (8) against the corresponding end of the lower pillar; The axial rib plate tightening bolt (9) cooperates with the threaded hole on the protruding part of the pin unit block (8) to press the outer end face of the lower part of the axial rib plate tightly; 7), Fix the upper pillar (15) in the upper positioning support assembly to the positioning and installation platform, fit the positioning nut (12) with the upper pillar, then install the retaining ring (13), and use the tightening nut (14) to press the retaining ring tightly; 8), Repeat steps 5)-7), and install each axial rib plate in turn; 9), Place a layer of height retainer (11) on the upper end face of the connecting flange, then place a layer of circumferential rib plate on the upper plane of the height retainer, and so on, install the circumferential rib plates and height retainers of the remaining layers; 10), Use the horizontal welding method to weld between the circumferential rib plates and the axial rib plates in contact with each other and between each axial rib plate and the connecting flange; Then turn the entire auxiliary device upside down, and use the horizontal welding method to weld the other side between the circumferential rib plates and the axial rib plates in contact with each other; 11), Finally, disassemble the positioning support device, height retainer, pressure plate, pin, and central cylinder support assembly in turn for the welding of the next plate grid frame product.

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