Anti-deformation tool for boom barrel and processing method of boom barrel

Abstract

This application relates to the field of positioning and clamping technology, and discloses an anti-deformation tooling and a processing method for a boom cylinder. The anti-deformation tooling includes a locking pin hole formed on the boom cylinder; a support base including a longitudinal beam for spanning the locking pin hole; and an anti-deformation unit mounted on the longitudinal beam, including a pull rod assembly for extending from the outside into the locking pin hole. The inner end of the pull rod assembly has a limiting abutment, and the outer end has a pull rod lifting mechanism for pulling the pull rod assembly outward. The method includes the steps of pre-installing a flange assembly on the outer wall of the boom cylinder; installing the aforementioned anti-deformation tooling for the boom cylinder on the outer wall of the boom cylinder, pulling the limiting abutment to suppress inward deformation of the outer wall; and welding the flange assembly to the outer wall. The anti-deformation tooling and processing method for the boom cylinder of this application can prevent the boom cylinder from deforming due to the welding of the flange plate, and eliminates the need for operators to enter the boom cylinder for operation, thus improving safety and convenience.

Description

Technical Field

[0001] This application belongs to the field of positioning and clamping technology, specifically, it relates to an anti-deformation tooling for a boom cylinder and a processing method for the boom cylinder. Background Technology

[0002] The telescopic boom is the main load-bearing component of a crane. The boom consists of a base boom and a telescopic boom, with the jib itself comprising a boom cylinder equipped with locking pin holes. The upper and lower booms are slidably fitted together. After the locking pin of the upper boom is inserted into the locking pin hole of the lower boom, the relative positioning of the upper and lower booms is achieved, thus fixing the telescopic length of the boom. Due to the large mass of the boom and the limited wall thickness and strength of the boom cylinder, flange plates are often welded at the locking pin holes to abut the locking pins, preventing direct contact between the locking pins and the boom cylinder. To further maintain the strength of the boom cylinder, reinforcing plates are also welded to the outer periphery of the flange plates.

[0003] The dimensional accuracy of the boom cylinder has a critical impact on boom assembly. During the welding of flange plates and reinforcing plates to the boom cylinder, the boom cylinder often shrinks and deforms, causing changes in its height and resulting in interference between boom sections. To prevent boom cylinder deformation, operators typically need to enter the cylinder and install vertical supports and jacks inside to perform anti-deformation operations.

[0004] However, the design dimensions of the cylinder are getting smaller and smaller. For example, when the height of the cylinder is less than 600mm and the width is less than 500mm, the operator can only crawl into the cylinder to support the deformed support rod, which makes the operation difficult and increases the risk of operation. Summary of the Invention

[0005] The purpose of this application is to provide an anti-deformation tooling for a boom cylinder and a processing method for the boom cylinder, so as to avoid deformation of the boom cylinder due to the welding of the flange plate, facilitate the smooth connection between booms, and eliminate the need for operators to enter the boom cylinder for operation, thereby improving the safety and convenience of operators.

[0006] To achieve the above objectives, this application provides an anti-deformation tooling for a boom cylinder, the anti-deformation tooling comprising:

[0007] The support base includes a longitudinal beam for spanning the locking pin hole setting;

[0008] The anti-deformation unit is mounted on the longitudinal beam and includes a tie rod assembly for extending into the locking pin hole from the outside in. The inner end of the tie rod assembly is provided with a limiting abutment and the outer end is provided with a tie rod lifting mechanism for pulling the tie rod assembly outward.

[0009] In some implementations, the limiting abutment is hinged to the inner end of the pull rod assembly.

[0010] In some embodiments, the limiting abutment is a U-shaped groove plate with a U-shaped groove, and the inner end of the pull rod assembly extends into the U-shaped groove and is hinged through the hinge shafts connecting the two side walls of the U-shaped groove, with the hinge shafts perpendicular to the pull rod assembly.

[0011] In the first pivotal hinge position of the limiting abutment, the limiting abutment is perpendicular to the pull rod assembly. In the second pivotal hinge position of the limiting abutment, the inner end of the pull rod assembly is accommodated in the U-shaped groove of the limiting abutment.

[0012] In some implementations...

[0013] The support base also includes:

[0014] The end support blocks are arranged laterally on the outer wall of the boom cylinder, and the ends of the longitudinal beams overlap the end support blocks;

[0015] Among them, several anti-deformation units are arranged at intervals along the length of the longitudinal beam.

[0016] In some implementations, the tie rod assembly includes:

[0017] Pull rod, with inner end hinged limiting and abutting component;

[0018] The outer end of the tie rod is connected to the middle of the bottom of the U-shaped frame;

[0019] The lifting frame is connected to the U-shaped frame;

[0020] One end of the tie rod lifting mechanism is supported on the longitudinal beam, and the other end acts on the lifting frame.

[0021] In some implementations...

[0022] The lifting frame is shaped like an inverted U-shape, with the two ends of the U-shape engaged with the two side walls of the lifting frame. The lever lifting mechanism is housed inside the lifting frame.

[0023] This application also protects a method for processing a boom cylinder, the method comprising the following steps:

[0024] Pre-install flange assemblies on the outer wall of the boom cylinder;

[0025] The aforementioned anti-deformation fixture for the boom is installed on the outer wall of the boom body. The limit abutment is pulled outward by the tie rod lifting mechanism to suppress the inward deformation of the outer wall.

[0026] The flange assembly is welded to the outer cylinder wall.

[0027] In some embodiments, the step of installing a flange assembly on the outer wall of the boom cylinder includes:

[0028] Pre-install the flange plate onto the locking pin hole;

[0029] Reinforcing plates are pre-installed around the flange plate to form a flange assembly.

[0030] In some embodiments, the step of welding the flange assembly to the boom body includes:

[0031] The periphery of the flange plate is welded to the outer wall of the boom cylinder;

[0032] The reinforcing plate is welded and fixed to the outer cylinder wall.

[0033] In some implementations, before welding the flange assembly to the boom cylinder, the limiting abutment is pulled outward by the tie rod lifting mechanism, causing the outer cylinder wall to bulge outward and deform to reach a preset bulge deformation amount.

[0034] In the technical solution of this application, the flange assembly is first positioned at the locking pin hole of the boom cylinder, a longitudinal beam is erected at the locking pin hole, and the anti-deformation unit is installed on the longitudinal beam. Then, the pull rod lifting mechanism of the anti-deformation unit pulls the limiting abutment member located inside the boom cylinder from the outside of the boom cylinder to support the boom cylinder, thereby suppressing the indentation deformation of the outer cylinder wall caused by the welding of the flange assembly. This invention can avoid the deformation of the boom cylinder due to the welding of the flange plate, facilitates smooth connection between booms, and eliminates the need for operators to enter the boom cylinder for operation, improving the safety and convenience of operators.

[0035] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0036] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without any inventive effort. In the drawings:

[0037] Figure 1 This is a schematic diagram of the boom structure;

[0038] Figure 2 for Figure 1 A top view of the boom in the middle;

[0039] Figure 3 for Figure 2 A cross-sectional view of position AA in the diagram;

[0040] Figure 4 This is a schematic diagram of the tooling for a boom according to a specific embodiment of this application;

[0041] Figure 5 for Figure 4 A schematic diagram of the assembled tie rod assembly and abutment parts of the tooling used for the boom;

[0042] Figure 6 for Figure 4 A schematic diagram of the lifting frame of the tooling used for the boom;

[0043] Figure 7 for Figure 4 A schematic diagram of the crossbeam of the tooling used for the boom;

[0044] Figure 8 Tooling for a boom according to a specific embodiment of this application and Figure 1 A schematic diagram of the assembled boom in the diagram;

[0045] Figure 9 for Figure 8 The tooling used for the boom and the side view of the boom after assembly;

[0046] Figure 10 for Figure 8 The tooling used for the boom and the top view of the boom after assembly;

[0047] Figure 11 for Figure 8 The diagram shows the tooling used for the boom and the structure of the boom in the front-to-back direction after assembly.

[0048] Explanation of reference numerals in the attached figures

[0049] I Locking pin hole 331 Longitudinal span beam

[0050] 100 Flange plate 331a Longitudinal plate

[0051] 200 boom cylinder, 110 reinforcing plate

[0052] 310 Limiting and abutting component 331c End support block

[0053] 320 Pull rod assembly; 332 Pull rod lifting mechanism

[0054] 321 U-shaped frame 340 Lifting frame

[0055] 321a Snap-fit ​​part 341 Boss

[0056] 322 Pull rod 341a Groove Detailed Implementation

[0057] The specific embodiments of this application will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this application.

[0058] The following description, with reference to the accompanying drawings, describes the anti-deformation tooling for a boom cylinder and the machining method for the boom cylinder according to this application.

[0059] This application discloses a novel anti-deformation tooling for a boom cylinder, such as... Figures 4 to 11 As shown, a specific embodiment of the anti-deformation tooling for the boom cylinder includes:

[0060] The support base includes a longitudinal beam 331 for spanning the locking pin hole I;

[0061] The anti-deformation unit is installed on the longitudinal beam 331 and includes a tie rod assembly 320 for extending into the locking pin hole I from the outside to the inside. The inner end of the tie rod assembly 320 is provided with a limiting abutment 310 and the outer end is provided with a tie rod lifting mechanism 332 for pulling the tie rod assembly 320 outward.

[0062] Specifically, see Figure 4 , Figure 8 , Figure 9 and Figure 11 The anti-deformation unit is installed on the longitudinal beam 331 spanning the locking pin hole I. The tie rod lifting mechanism 332 of the anti-deformation unit can pull the limiting abutment 310 located inside the boom cylinder 200 from the outside of the boom cylinder 200 to push the boom cylinder 200 outward, thereby suppressing the dent deformation of the boom cylinder 200 caused by the welding and installation of additional components (such as flange components) on the boom cylinder 200. Compared with the prior art, which requires operators to enter the boom cylinder 200 and install vertical supports and jacks inside the boom cylinder 200 for anti-deformation work, this application can directly set up the anti-deformation tooling for the boom cylinder on the boom cylinder 200, which is convenient for operation and does not require operators to enter the boom cylinder 200. This not only improves the safety of operators but also enhances the convenience of operation.

[0063] In this embodiment, such as Figure 4 , Figure 5 and Figure 8 As shown, the limiting abutment 310 can be hinged to the inner end of the pull rod assembly 320.

[0064] Specifically, see Figure 5Because the area of ​​the boom cylinder 200 that the limiting abutment member 310 needs to abut against is relatively large, the size of the limiting abutment member 310 is also relatively large, while the size of the locking pin hole I is relatively small. In order to facilitate the limiting abutment member 310 to extend from the outside of the boom cylinder 200 into the inside of the boom cylinder 200 through the locking pin hole I, the limiting abutment member 310 can be hinged to the inner end of the tie rod assembly 320. After the limiting abutment member 310 is tilted to be close to the tie rod assembly 320, it can be easily extended into the boom cylinder 200.

[0065] In this embodiment, such as Figure 4 , Figure 5 and Figure 8 As shown, the limiting abutment 310 can be a U-shaped groove plate with a U-shaped groove. The inner end of the pull rod assembly 320 extends into the U-shaped groove and is hinged through the hinge shaft connecting the two sides of the groove wall of the U-shaped groove. The hinge shaft is perpendicular to the pull rod assembly 320.

[0066] In the first pivotal hinge position of the limiting abutment member 310, the limiting abutment member 310 is perpendicular to the pull rod assembly 320. In the second pivotal hinge position of the limiting abutment member 310, the inner end of the pull rod assembly 320 is accommodated in the U-shaped groove of the limiting abutment member 310.

[0067] See Figure 5 By designing the limiting abutment 310 as a U-shaped groove plate, when the limiting abutment 310 is in the second pivot hinge position, the inner end of the pull rod assembly 320 fits against the inner wall of the U-shaped groove, resulting in a smaller overall size. This facilitates the insertion of the limiting abutment 310 into the locking pin hole I and also makes it easier to store. When the limiting abutment 310 is in the first pivot hinge position, it can easily support the inner wall of the boom cylinder 200. Because the limiting abutment 310 is a bent plate, it has good overall strength, is not easily deformed, can withstand greater tensile force, and can achieve a better supporting effect. Furthermore, after the limiting abutment 310 is inserted into the boom cylinder 200, it can switch from the second pivot hinge position to the first pivot hinge position due to gravity.

[0068] In this embodiment, such as Figure 4 As shown, the support base may also include:

[0069] The end support block 331c is arranged laterally on the outer wall of the boom cylinder 200, and the end of the longitudinal beam 331 overlaps on the end support block 331c.

[0070] Among them, several anti-deformation units are arranged at intervals along the length direction of the longitudinal span beam 331.

[0071] Specifically, see Figure 4After the end support block 331c is placed between the end of the boom cylinder 200 and the end of the longitudinal beam 331, the height of the longitudinal beam 331 can be increased so that the longitudinal beam 331 will not interfere with the additional components (such as the flange plate 100 installed in the locking pin hole I). It can also be more flexible in subsequent operations. For example, it can allow the boom cylinder 200 to be supported by the limiting abutment member 310 to deform outward. Furthermore, since the longitudinal beam 331 serves as the mounting part of the tie rod lifting mechanism 332, it will bear the reaction force generated when the tie rod lifting mechanism 332 stretches outward to limit the abutment 310. The placement of end support blocks 331c between the longitudinal beam 331 and the boom cylinder 200 helps to distribute this reaction force evenly on the boom cylinder 200, reducing deformation of the boom cylinder 200. Arranging multiple anti-deformation units also increases the effect of the anti-deformation tooling used on the boom cylinder 200 in suppressing deformation. For example, Figure 7 As shown, the longitudinal span beam 331 includes two longitudinal plates 331a arranged laterally at intervals, and the inner end of the tie rod assembly 320 extends from between the two longitudinal plates 331a into the locking pin hole I. This arrangement ensures that the structural strength of the longitudinal span beam 331 is maintained while ensuring that the tie rod lifting mechanism 332 is directly opposite the locking pin hole I. Multiple stiffening plates can also be provided between the longitudinal plates 331a to further enhance the structural strength of the longitudinal span beam 331.

[0072] In this embodiment, such as Figures 4 to 6 As shown, the pull rod assembly 320 may include:

[0073] Pull rod 322, inner end hinged limiting abutment part 310;

[0074] The outer end of the U-shaped frame 321 and the tie rod 322 are connected to the middle of the bottom end of the U-shaped frame 321;

[0075] The lifting frame 340 is connected to the U-shaped frame 321;

[0076] One end of the lever lifting mechanism 332 is supported on the longitudinal beam 331, and the other end acts on the lifting frame 340.

[0077] Specifically, see Figure 4 The lever lifting mechanism 332 is a jack. When the jack lifts the lifting frame 340 with the longitudinal beam 331 as the fulcrum, the lifting frame 340 can drive the U-shaped frame 321 to move, thereby driving the lever 322, which in turn pulls the lever 322 outward to lift the limiting abutment 310. This arrangement ensures a stable transmission relationship between the lever lifting mechanism 332 and the limiting abutment 310.

[0078] In this embodiment, such as Figure 6As shown, the lifting frame 340 can be in the shape of an inverted U-shaped cover. The two ends of the U-shaped frame 321 are engaged with the two side walls of the lifting frame 340, and the lever lifting mechanism 332 is housed inside the lifting frame 340.

[0079] See Figure 5 and Figure 6 The lifting frame 340 is a frame structure. Both sides of the frame structure extend outwards and form bosses 341. The outer top surface of the bosses 341 is recessed inwards and forms grooves 341a. The two ends of the U-shaped frame 321 extend towards each other and form engaging portions 321a. The engaging portions 321a engage with the grooves 341a. This design improves the stability of the transmission connection between the jack and the limiting abutment 310, and also facilitates the assembly and disassembly of the anti-deformation fixture used on the boom cylinder 200.

[0080] Specifically, when installing the anti-deformation fixture for the boom body, the end support blocks 331c are arranged on both sides of the locking pin hole I, and the longitudinal beam 331 is slung across. The limiting abutment 310 is hinged to the tie rod 322, and the limiting abutment 310 is tilted to the second pivot hinge position. The tie rod assembly 320 is then inserted into the locking pin hole I between the two longitudinal plates 331a. Because the U-shaped frame 321 at the upper end of the tie rod 322 is relatively large, it will engage with the boom body. After installing the jack and the lifting frame 340 on the longitudinal plate 331a, the U-shaped frame 321 can be lifted so that the engaging part 321a engages with the groove 341a of the lifting frame 340, thus completing the installation step. Similarly, those skilled in the art can easily conceive of the disassembly steps of the anti-deformation fixture for the boom body on the boom body 200, which will not be described in detail here.

[0081] This application discloses a novel method for processing a boom cylinder, such as... Figures 1 to 3 and Figures 8 to 11 As shown, a method in one specific embodiment includes the following steps:

[0082] Pre-install flange assemblies on the outer wall of the boom cylinder 200;

[0083] The aforementioned anti-deformation fixture for the boom cylinder is installed on the outer cylinder wall of the boom cylinder 200. The limit abutment 310 is pulled outward by the pull rod lifting mechanism 332 to suppress the inward deformation of the outer cylinder wall.

[0084] Specifically, see Figure 8To prevent the welded portion of the boom cylinder 200 from denting and deforming due to thermal stress when welding the flange assembly to the outer cylinder wall, the flange assembly is first placed on the outer cylinder wall, with the limiting abutment 310 supporting the inner cylinder wall to suppress welding deformation caused by subsequent welding of the flange assembly to the outer cylinder wall. Due to the various technical effects of the aforementioned anti-deformation fixture for the boom cylinder, the anti-deformation fixture for the boom cylinder 200 can be easily and directly arranged on the boom cylinder 200, greatly reducing the difficulty and danger of operation compared to existing technologies that require operators to enter the boom cylinder 200.

[0085] In this embodiment, such as Figures 1 to 3 As shown, the step of installing a flange assembly on the outer wall of the boom cylinder 200 may include:

[0086] Pre-install flange plate 100 on locking pin hole I;

[0087] A reinforcing plate 110 is pre-installed around the flange plate 100 to form a flange assembly.

[0088] Specifically, see Figure 1 The flange plate 100 is fitted into the locking pin hole I. The flange plate 100 has a flange hole for abutting the locking pin. Therefore, during the use of the boom body 200, the locking pin abuts against the flange hole, preventing the boom body 200 from deforming or failing due to direct contact between the locking pin and the boom body 200. In addition, a reinforcing plate 110 is also provided around the flange plate 100 to further enhance the local structural strength of the boom body 200 at that location.

[0089] In this embodiment, the step of welding the flange assembly to the boom cylinder 200 may include:

[0090] The periphery of the flange plate 100 is welded to the outer wall of the boom cylinder 200;

[0091] The reinforcing plate 110 is welded and fixed to the outer cylinder wall.

[0092] Specifically, this design avoids welding deformation on the boom cylinder 200 caused by the welding of the reinforcing plate 110. Such welding deformation could affect the mating and positioning between the locking pin hole I and the flange plate 100, thus preventing the locking pin from being inserted into the flange hole.

[0093] In this embodiment, before welding the flange assembly to the boom cylinder 200, the limit abutment 310 can be pulled outward by the pull rod lifting mechanism 332, so that the outer cylinder wall bulges outward and deforms to reach the preset bulging deformation amount.

[0094] Specifically, this configuration allows for the use of a preset bulge deformation amount to offset part of the welding deformation generated during the welding process, thereby enhancing the anti-deformation fixture's effect on suppressing the deformation of the boom cylinder 200. When welding is completed and the limiting abutment 310 is released from its support on the inner wall of the boom cylinder 200, the boom cylinder 200 will spring back. Specifically, when the height of the boom cylinder 200 is approximately 800mm, the preset bulge deformation amount can be approximately 20mm.

[0095] Preferably, the maximum diameter of the boom cylinder 200 does not exceed 800 mm. In other words, the appropriate anti-deformation tooling can be selected according to the size of the boom cylinder 200. When the maximum diameter of the boom cylinder 200 is less than 800 mm, it is difficult for operators to enter the boom cylinder 200 and set up the anti-deformation tooling. Therefore, the anti-deformation tooling for the boom cylinder in this application is preferably applicable to anti-deformation operations of various small-sized boom cylinders 200.

[0096] In the description of this application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0097] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between components; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0098] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

Claims

1. A tooling for counter-deformation of a boom cylinder, wherein a locking pin hole (I) is formed on the boom cylinder (200), characterized in that, The anti-deformation tooling includes: The support base includes a longitudinal beam (331) for extending across the locking pin hole (I); The anti-deformation unit is installed on the longitudinal beam (331) and includes a pull rod assembly (320) for extending into the locking pin hole (I) from the outside to the inside. The inner end of the pull rod assembly (320) is provided with a limiting abutment (310) and the outer end is provided with a pull rod lifting mechanism (332) for pulling the pull rod assembly (320) outward. The limiting abutment (310) is a U-shaped groove plate with a U-shaped groove. The inner end of the pull rod assembly (320) extends into the U-shaped groove and is hinged through a hinge shaft connecting the two side walls of the U-shaped groove. In the first pivot hinge position of the limiting abutment (310), the limiting abutment (310) is perpendicular to the pull rod assembly (320). In the second pivot hinge position of the limiting abutment (310), the inner end of the pull rod assembly (320) is accommodated in the U-shaped groove of the limiting abutment (310). The pull rod assembly (320) includes a pull rod (322), a U-shaped frame (321), and a lifting frame (…). 340), the inner end of the pull rod (322) is hinged to the limiting abutment (310), the outer end of the pull rod (322) is connected to the middle of the bottom end of the U-shaped frame (321), the lifting frame (340) is connected to the U-shaped frame (321), one end of the pull rod lifting mechanism (332) is supported on the longitudinal beam (331), and the other end acts on the lifting frame (340). The lifting frame (340) is in the shape of an inverted U-shaped cover. The two U-shaped ends of the U-shaped frame (321) are engaged with the two side walls of the lifting frame (340), and the pull rod lifting mechanism (332) is accommodated in the lifting frame (340).

2. The anti-deformation tooling for a boom cylinder according to claim 1, characterized in that, The support base also includes: An end support block (331c) is arranged laterally on the outer wall of the boom cylinder (200), and the end of the longitudinal beam (331) overlaps the end support block (331c); Among them, several of the anti-deformation units are arranged at intervals along the length direction of the longitudinal beam (331).

3. A method for processing the boom cylinder, characterized in that, The method includes the following steps: A flange assembly is pre-installed on the outer wall of the boom cylinder (200); An anti-deformation tooling for the boom cylinder (200) according to claim 1 or 2 is installed on the outer cylinder wall of the boom cylinder (200). The limiting abutment (310) is pulled outward by the pull rod lifting mechanism (332) to suppress the inward deformation of the outer cylinder wall. The flange assembly is welded to the outer cylinder wall.

4. The method for processing the boom cylinder according to claim 3, characterized in that, The step of installing a flange assembly on the outer wall of the boom cylinder (200) includes: The flange plate (100) is pre-installed on the locking pin hole (I); A reinforcing plate (110) is pre-installed on the periphery of the flange plate (100) to form a flange assembly.

5. The method for processing the boom cylinder according to claim 4, characterized in that, The step of welding the flange assembly to the boom body (200) includes: The periphery of the flange plate (100) is welded to the outer wall of the boom cylinder (200); The reinforcing plate (110) is welded and fixed to the outer cylinder wall.

6. The method for processing the boom cylinder according to claim 3, characterized in that, Before welding the flange assembly to the boom cylinder (200), the limiting abutment (310) is pulled outward by the pull rod lifting mechanism (332), so that the outer cylinder wall bulges outward and deforms to a preset bulge deformation amount.

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