Excavator boom welding apparatus and method

Abstract

The application discloses a kind of excavator movable arm welding device and welding method, the welding device includes front fork welding fixture, front section welding fixture, middle section welding fixture, tail section welding fixture;Different welding fixture is used to segmentally weld each section of movable arm first, then each section is assembled by using total group welding fixture Welding. Each welding fixture can be adjusted, according to the size of different movable arm and size adjustment, to meet the welding of various models of movable arm, increase the welding space, reduce the difficulty of clamping positioning, improve the welding precision of movable arm, and then improve product quality;It is simple to operate simultaneously, and each component of movable arm is step-by-step welded without affecting each other, which improves the production efficiency and product quality of movable arm.

Description

Technical Field

[0001] This invention belongs to the field of excavator boom processing technology, specifically relating to an excavator boom welding device and welding method. Background Technology

[0002] Excavator products have a wide tonnage range, and the corresponding boom shapes and dimensions vary, with some products even differing in structure. For a long time, the structural division has used a simple positioning method to assemble and weld the boom, which makes it difficult to control dimensions and results in large differences in the dimensions of individual parts. This is detrimental to the quality stability of the boom components and the application of welding robots.

[0003] Patent application number CN201120240658.1 discloses a welding device for excavator booms, and discloses that the base is equipped with a front support positioning seat, a middle support positioning seat, a rear support positioning seat, and a lower cover plate support positioning seat. Both the front and rear support positioning seats have grooves, and a first mandrel and a second mandrel are respectively positioned in the grooves of the front and rear support positioning seats by tightening screws. Firstly, this welding device is mainly suitable for welding booms of medium-sized and large excavators, limiting its application. When welding small excavator booms or booms of other different shapes and sizes, the positioning seats cannot be flexibly adjusted. Secondly, the connection between adjacent boom components mainly relies on the support and fixation of each support. During boom welding, unstable fixation of the boom components can easily occur, thus affecting the quality of the boom welding. Summary of the Invention

[0004] To address the aforementioned problems, the present invention aims to provide a welding device and welding method for excavator booms.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A welding device for excavator booms includes a fork welding fixture for machining boom forks; the boom fork welding fixture includes a fork main platform.

[0007] The fork support is located on the main platform of the fork and has a U-shaped opening at one end.

[0008] A fork positioning seat is provided on both sides of the fork support seat, and a baffle support is provided between the fork positioning seats. Each fork positioning seat is provided with multiple mounting holes for installing the positioning core and multiple side plate support bolts.

[0009] The fork clamping support is slidably positioned in the direction of the U-shaped opening;

[0010] An angle measuring support is installed on the fork support and at one end where the fork clamping support is located.

[0011] Preferably, the fork positioning seat and the fork clamping support are slidably connected to the fork main platform through the fork guide rail slider mechanism, and are provided with limiting members that cooperate with the fork guide rail slider mechanism.

[0012] Preferably, the positioning core has a wedge for fixing the boom fork.

[0013] Preferably, it also includes a front welding fixture for machining the boom front section and boom fork; the front welding fixture includes a front main platform;

[0014] Two front sliding platforms are provided, arranged parallel to each other along the length of the front main platform; each front sliding platform is provided with a front positioning support and a front clamping support respectively.

[0015] Two U-shaped positioning seats are set on one side of the front sliding platform.

[0016] Preferably, the front positioning support and the front clamping support are slidably connected to the front sliding platform; the front sliding platform is slidably connected to the front main platform.

[0017] Preferably, it further includes a mid-section welding fixture for processing the mid-section of the boom; the mid-section welding fixture includes a mid-section main platform, a mid-section clamping seat disposed on the mid-section main platform, a central shaft positioning seat disposed on the same straight line as the mid-section clamping seat, a first clamping support, a second clamping support and a positioning and height fixing seat disposed around the central shaft positioning seat, and an ear plate positioning seat and a support block disposed on one side of the first clamping support; the second clamping support and the positioning and height fixing seat are slidably connected to the mid-section main platform.

[0018] Preferably, it also includes a tail section welding fixture for machining the tail section of the boom; the tail section welding fixture includes a tail section main platform;

[0019] The tail section sliding platform consists of two parallel platforms, which are slidably connected to the tail section main platform. Each tail section sliding platform is equipped with a screw clamping seat and a tail section positioning support.

[0020] The tail section U-shaped positioning seat is located at one end of the tail section sliding platform.

[0021] Preferably, it also includes a welding fixture for processing the boom assembly; the welding fixture includes a main platform for the assembly, and a front positioning component, a middle positioning component and a tail positioning component are sequentially arranged on the main platform for the assembly.

[0022] Preferably, the front positioning component includes a front positioning seat and a front limiting seat that are slidably disposed on the main platform of the assembly;

[0023] The mid-section positioning component includes a mid-section positioning support, a mid-section positioning clamping seat, and a mid-section positioning seat, all mounted on the main platform of the assembly, as well as a mid-section limiting seat that is slidably mounted on the main platform of the assembly.

[0024] The tail section positioning assembly includes a tail end limiting seat, a tail section positioning seat, and a tail section cover plate clamping seat, all located on the main platform of the assembly.

[0025] A method for welding an excavator boom includes the following steps:

[0026] Step 1: Machin the welded parts of the boom fork, boom front section, boom middle section, and boom tail section respectively, and machine positioning surfaces and / or positioning holes on each welded part.

[0027] Step 2: Fix the positioning surfaces and positioning holes on the welding parts of the boom fork, boom mid section and boom tail section onto the corresponding welding fixtures respectively, and weld them to form the corresponding components.

[0028] Step 3: Place the welded boom fork and the welded assembly parts of the boom front section on the same welding fixture for welding;

[0029] Step 4: The components welded in Step 2 and Step 3 are clamped and positioned using the assembly welding fixture and welded together as one unit;

[0030] Step 5: After the boom is assembled and welded, the weld slag is removed and the weld bristles are ground off.

[0031] Compared with the prior art, the present invention has the following advantages:

[0032] This invention discloses a welding device and method for excavator booms, comprising a front fork welding fixture, a front section welding fixture, a middle section welding fixture, and a tail section welding fixture. First, different welding fixtures are used to weld the various sections of the boom separately. Then, a final assembly welding fixture is used to weld the sections together. Each welding fixture is adjustable to accommodate different boom sizes and dimensions, increasing welding space, reducing clamping and positioning difficulty, improving boom welding accuracy, and thus improving product quality. Simultaneously, the operation is simple, with each boom component being welded separately without interference, improving boom production efficiency and product quality. Attached Figure Description

[0033] To more clearly illustrate the technical solutions in the specific embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0034] Figure 1This is a schematic diagram of the front fork welding fixture in this invention;

[0035] Figure 2 This is a schematic diagram of the welding of the boom fork in this invention;

[0036] Figure 3 This is a schematic diagram of the front welding fixture in this invention;

[0037] Figure 4 This is a schematic diagram of the welding of the front section of the boom in this invention;

[0038] Figure 5 This is a schematic diagram of the structure of the mid-section welding fixture in this invention;

[0039] Figure 6 This is a schematic diagram of the welding of the middle section of the boom in this invention;

[0040] Figure 7 This is a schematic diagram of the tail section welding fixture in this invention;

[0041] Figure 8 This is a schematic diagram of the welding of the boom tail section in this invention;

[0042] Figure 9 This is a schematic diagram of the overall welding fixture in this invention;

[0043] Figure 10 This is a schematic diagram of the welding of the boom assembly in this invention;

[0044] Reference numerals: 1-Front fork welding fixture, 101-Boom front fork, 10-Front fork main platform, 11-Front fork support seat, 12-Front fork positioning seat, 13-Baffle support, 14-Positioning core, 140-Wedge, 15-Mounting hole, 16-Side plate support bolt, 17-Front fork clamping support, 18-Angle measuring support, 19-Front fork guide rail slider mechanism, 190-Limiting component, 2-Front section welding fixture, 201-Boom front section, 20-Front section main platform, 21-Front section sliding platform, 22-Front section positioning support, 23-Front section clamping support, 24-Front section U-shaped positioning seat, 3-Middle section welding fixture, 301-Boom middle section, 30-Middle section main platform, 31-Middle section clamping seat, 32-Central shaft positioning seat, 33-First clamping support, 3 4-Second clamping support, 35-Positioning and height-setting seat, 36-Ear plate positioning seat, 37-Support block, 4-Tail section welding fixture, 401-Boom tail section, 40-Tail section main platform, 41-Tail section sliding platform, 42-Screw clamping seat, 43-Tail section positioning support, 44-Tail section U-shaped positioning seat, 5-Assembly welding fixture, 501-Boom assembly, 50-Assembly main platform, 51-Front section positioning assembly, 510-Front section positioning seat, 511-Front section limiting seat, 52-Middle section positioning assembly, 520-Middle section positioning support seat, 521-Middle section positioning clamping seat, 522-Middle section positioning seat, 523-Middle section limiting seat, 53-Tail section positioning assembly, 530-Tail end limiting seat, 531-Tail section positioning seat, 532-Tail section cover plate clamping seat. Detailed Implementation

[0045] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. However, it should not be construed that the scope of the subject matter of the present invention is limited to the following embodiments. All modifications, substitutions and alterations made based on ordinary technical knowledge and common practices in the art without departing from the above-described technical concept of the present invention are included within the scope of the present invention.

[0046] A welding device for an excavator boom in this invention, referring to... Figures 1 to 10 It includes a fork welding fixture 1 for machining the boom fork 101, a front section welding fixture 2 for machining the boom front section 201 and the boom fork 101, a middle section welding fixture 3 for machining the boom middle section 301, a tail section welding fixture 4 for machining the boom tail section 401, and a final assembly welding fixture 5 for machining the boom assembly 501.

[0047] Each welding fixture is equipped with a guide rail slider mechanism. The positioning element can slide along the guide rail and complete the connection and fixed positioning at different positions through the set positioning holes and positioning pins, so as to realize the position change and adjustment of the positioning element and thus meet the welding of various types of booms.

[0048] Reference Figure 1 and Figure 2The boom fork welding fixture 1 of the present invention is used for welding boom fork 101, including fork main platform 10;

[0049] The fork support 11 is located on the fork main platform 10, and one end of it is provided with a U-shaped opening.

[0050] The fork positioning seat 12 is disposed on both sides of the fork support seat 11, and a baffle support 13 is disposed between the fork positioning seats 12 disposed opposite each other; each fork positioning seat 12 is provided with a plurality of mounting holes 15 for mounting positioning core 14 and a plurality of side plate support bolts 16.

[0051] The fork clamping support 17 is slidably positioned in the direction of the U-shaped opening;

[0052] An angle measuring support 18 is mounted on the fork support 11 and located at one end of the fork clamping support 17.

[0053] The fork positioning seat 12 and the fork clamping support 17 are slidably connected to the fork main platform through the fork guide rail slider mechanism 19, and are provided with a limiting member 190 that cooperates with the fork guide rail slider mechanism 19.

[0054] The positioning core 14 has a wedge 140 for fixing the boom fork 101.

[0055] Specifically, the fork welding fixture 1 includes a fork main platform 10; a fork support 11 is provided at the middle position along the length of the fork main platform 10. The fork support 11 is generally convex, and a U-shaped opening is provided at the longer end of the fork support 11. A fork clamping support 17 is connected upward along the U-shaped opening. The fork clamping support 17 is slidably connected to the fork main platform 10 through a fork guide rail slider mechanism 19 and works in conjunction with a limiting member 19. Here, the fork guide rail slider mechanism 19 and the limiting member 190 include a first guide rail extending outward along the U-shaped opening, a first slider provided on the first guide rail and connected to the fork clamping support 17, a first positioning pin hole correspondingly provided on the fork clamping support 17, the first slider, and the first guide rail, and a first positioning pin that works in conjunction with the first positioning pin hole; and first limiting blocks are provided on both sides along the length of the first guide rail to prevent the fork clamping support 17 from sliding out of the first guide rail.

[0056] An angle measuring support 18 is provided on the top of the side of the fork support 11 that is close to the fork clamping support 17.

[0057] A fork positioning seat 12 is installed at the convex step of the fork support 11. Two fork positioning seats 12 are provided on opposite sides of the fork support 11. They are installed on the fork main platform 10 via a fork guide rail slider mechanism 19 and cooperate with the limiting member 19. The fork guide rail slider mechanism 19 and the limiting member 190 include two second guide rails perpendicular to the fork support 11, a second slider on the second guide rails and connected to the fork positioning seat 12, a second positioning pin hole corresponding to the fork positioning seat 12 and the fork main platform 10, and a second positioning pin that cooperates with the second positioning pin hole. A second limiting block is provided at one end of the length direction of the second guide rail to prevent the fork positioning seat 12 from sliding out of the second guide rail.

[0058] A label for the specific product model is fixed next to the second locating pin hole to ensure that the locating hole of the product to be welded can be quickly located during the welding operation.

[0059] Multiple side plate support bolts 16 are provided on one side of each fork positioning seat 12 close to the fork support seat 11; in this embodiment, the side plate support bolts 16 are arranged on the same straight line and are adjustable in the vertical direction to assist in supporting the components (side plates) of the boom fork.

[0060] A baffle support 13 is provided between the two front fork positioning seats 12, and the baffle support 13 is mounted on one of the front fork positioning seats 12. Multiple mounting holes 15 for mounting positioning cores 14 are respectively opened on the opposite surfaces of the two front fork positioning seats 12. The positioning cores 14 are connected to the mounting holes 15 by threads, and wedges 140 for fixing the boom fork 101 are provided on the side wall of the positioning core 14. The positioning cores 14 used for welding different specifications and models of boom forks 101 are different. The positioning cores 14 and mounting holes 15 are connected by threads, which facilitates the replacement of the positioning cores in advance when changing production models.

[0061] When welding the boom fork 101, refer to Figure 2 This includes the following steps:

[0062] Step 1: Place the U-shaped plate from the boom fork onto the fork support 11, and position it by pressing it against the baffle support 13. Slide the fork pressing support 17 to the appropriate position to press the U-shaped plate onto the fork support 11, and fix it with the first positioning pin.

[0063] Step 2: Install the left and right side plates of the boom fork onto the two oppositely arranged fork positioning seats 12, insert the wedge 140 on the positioning core 14, so that the left and right side plates are tightly attached to the two fork positioning seats 12 respectively, find the angle measuring support 18 corresponding to the product model, measure whether the side plate angle is correct, and adjust the side plate support bolts 16 on the two fork positioning seats 12 so that the edges of the left and right side plates are in contact with the surface of the angle measuring support 18 placed on the main platform.

[0064] Step 3: Push the two fork positioning seats 12 to a specific position, insert the second positioning pin to fix the two fork positioning seats 12 to the fork main platform 10 respectively;

[0065] Step 4: Weld the welds on the boom fork that can be welded on the tooling, remove the tooling, repair the unwelded welds, and complete the boom fork welding.

[0066] Reference Figure 3 and Figure 4 The boom front section welding fixture 2 in this invention is used to weld the boom front section 201 and weld the boom front section 201 and the boom front fork 101 into one piece, including the front main platform 20.

[0067] Two front sliding platforms 21 are provided, which are arranged parallel to each other along the length of the front main platform 20; a front positioning support 22 and a front clamping support 23 are respectively provided on each front sliding platform 21.

[0068] Two U-shaped positioning seats 24 are provided on one side of the front sliding platform 21.

[0069] The front positioning support 22 and the front clamping support 23 are slidably connected to the front sliding platform 21, respectively; the front sliding platform 21 is slidably connected to the front main platform 20.

[0070] Specifically, the front welding fixture 2 includes a front main platform 20; two parallel front sliding platforms 21 are arranged along the length of the front main platform 20. The two front sliding platforms 21 are slidably connected to the front main platform 20 via a third guide rail and a third slider, respectively. When sliding on the third guide rail, the two front sliding platforms 21 move towards each other or away from each other. Multiple third positioning pin holes are correspondingly provided on the front sliding platforms 21 and the front main platform 20, and these holes cooperate with third positioning pins to fix the position of the front sliding platforms 21 relative to the front main platform 20. Third limiting blocks are provided at both ends of the first rail to prevent the front sliding platforms 21 from sliding out of the third guide rail.

[0071] Each front sliding platform 21 is provided with a front positioning support 22 and a front clamping support 23, which are slidably connected to the front sliding platform 21. Specifically, a fourth guide rail is provided along the length of the top of the front sliding platform 21, and the fourth guide rail is perpendicular to the third guide rail; a fourth slider is provided at the bottom of the front positioning support 22 and the front clamping support 23, and the fourth slider is slidably connected to the fourth guide rail. Fourth limiting blocks are provided on both sides of the fourth guide rail to prevent the front positioning support 22 and the front clamping support 23 from sliding out of the front sliding platform 21. Fourth positioning pin holes are provided at corresponding positions of the front positioning support 22, the front clamping support 23, and the front sliding platform 21, and fourth positioning pins are provided to cooperate with the fourth positioning pin holes to fix the front positioning support 22 and the front clamping support 23 to the front sliding platform 21.

[0072] Two front U-shaped positioning seats 24 are provided on one side of the front sliding platform 21 along the length direction. The two front U-shaped positioning seats 24 are arranged opposite each other and are respectively arranged to correspond to one front sliding platform 21. A shaft for fixing the boom fork 101 is provided between the two front U-shaped positioning seats 24.

[0073] The front positioning support 22 and the front clamping support 23 are slidably connected to the front sliding platform 21 to accommodate different boom front sections with varying lengths. The front sliding platform 21 is slidably connected to the front main platform 20 to ensure that the opening dimensions of different boom front sections are met.

[0074] Reference Figure 4 During the welding of the boom front section 201, each component of the boom front section 201 is fixed between the front section positioning support 22 and the front section clamping support 23, and the boom fork 101 is fixed between the two front section U-shaped positioning seats 24. By adjusting the relative positions of the front section positioning support 22, the front section clamping support 23 and the front section sliding platform 21, the relative positions of each component of the boom front section 201 and the boom fork 101 are adjusted. After the adjustment is completed, the positions of the front section positioning support 22, the front section clamping support 23 and the front section sliding platform 21 are fixed respectively, and the components of the boom front section 201 and the boom fork 101 are welded together as one unit.

[0075] Reference Figure 5 and Figure 6The boom mid-section welding fixture 3 of the present invention is used for welding the boom mid-section 301. It includes a mid-section main platform 30, a mid-section clamping seat 31 disposed on the mid-section main platform 30, a central shaft positioning seat 32 disposed on the same straight line as the mid-section clamping seat 31, a first clamping support 33, a second clamping support 34 and a positioning and height fixing seat 35 disposed around the central shaft positioning seat 32, and an ear plate positioning seat 36 and a support block 37 disposed on one side of the first clamping support 33; the second clamping support 34 and the positioning and height fixing seat 35 are slidably connected to the mid-section main platform 30 respectively.

[0076] Specifically, the mid-section welding fixture 3 includes a mid-section main platform 30, on which components for fixing the various components of the mid-section 301 are distributed according to the shape of the boom mid-section 301.

[0077] A mid-section clamping seat 31 is provided at the middle of the long side of the mid-section main platform 30, and a central axis positioning seat 32 is provided at the middle of the mid-section main platform 30. The central axis positioning seat 32 and the mid-section clamping seat 31 are located on the same straight line.

[0078] In this embodiment, the axial positioning seat 32 and the middle section pressing seat 31 are equipped with a first pressing support 33, a second pressing support 34 and a positioning and height setting seat 35 on both sides; the first pressing support 33 is configured as two, located on both sides of the middle section pressing seat 31, and is used to press the middle section component of the boom.

[0079] Two second clamping supports 34 are provided, and they are connected to the middle main platform 30 via a fifth guide rail and a fifth slider. Fifth limiting blocks are provided at both ends of the fifth guide rail. Fifth positioning pin holes are provided at corresponding positions on the second clamping supports 34 and the middle main platform 30, and fifth positioning pins are provided to cooperate with these holes. The first clamping supports 33 and the second clamping supports 34 are used to clamp different components of the boom middle section 301.

[0080] The positioning and height-fixing seats 35 are configured in three parts, respectively located on one of the second clamping supports 34 and one of the first clamping supports 33, one of the first clamping supports 33 and the middle section clamping seat 31, and one of the middle section clamping seats 31 and another first clamping support 33. Each positioning and height-fixing seat 35 is connected to the middle section main platform 30 through a sixth guide rail and a sixth slider, and is correspondingly provided with a sixth limit block, a sixth positioning pin hole and a sixth positioning pin.

[0081] The ear plate positioning seat 36 and the support block 37 are arranged close to another first pressing support 33.

[0082] The components of the boom mid-section 301 are fixed and welded together through the cooperation of the mid-section clamping seat 31, the central shaft positioning seat 32, the first clamping support 33, the second clamping support 34, the positioning and height setting seat 35, the ear plate positioning seat 36 and the support block 37.

[0083] Reference Figure 7 and Figure 8 The boom tail section welding fixture 4 in this invention is used for welding the boom tail section 401, including the tail section main platform 40.

[0084] There are two parallel tail section sliding platforms 41, which are slidably connected to the tail section main platform 40 respectively. Each tail section sliding platform 41 is provided with a screw clamping seat 42 and a tail section positioning support 43.

[0085] The tail section U-shaped positioning seat 44 is located at one end of the tail section sliding platform 41.

[0086] Specifically, the tail section welding fixture 4 includes a tail section main platform 40, with two tail section sliding platforms 41 arranged parallel to each other along the length of the tail section main platform 40 and slidably connected to it. The two tail section sliding platforms 41 slide towards each other or relative to each other, that is, the tail section sliding platforms 41 slide along the width direction of the tail section main platform 40. Each tail section sliding platform 41 is slidably connected to the tail section main platform 40 via a seventh guide rail and a seventh slider, and is correspondingly provided with a seventh limiting block, a seventh positioning pin hole, and a seventh positioning pin.

[0087] Each tail section sliding platform 41 is provided with a screw clamping seat 42 and a tail section positioning support 43. The tail section positioning support 43 is slidably connected to the tail section sliding platform 41 through a guide rail slider mechanism and slides along the length of the tail section sliding platform 41. The guide rail slider mechanism is the same as the sliding connection method described above, and will not be repeated below. The screw clamping seat 42 is located at one end of the tail section sliding platform 41.

[0088] Two tail section U-shaped positioning seats 44 are also provided on the tail section main platform 40, and the tail section U-shaped positioning seats 44 are located at one end of the screw clamping seat 42. Through the cooperation of the tail section sliding platform 41, the screw clamping seat 42 and the tail section positioning support 43, the components of the boom tail section 401 are fixed and welded.

[0089] Reference Figure 9 and Figure 10 The boom assembly welding fixture 5 of this invention is used to weld the boom assembly 501, that is, to weld the boom sections that have been welded above into one piece. The assembly welding fixture 5 includes a main assembly platform 50, and a front section positioning component 51, a middle section positioning component 52 and a tail section positioning component 53 are sequentially arranged on the main assembly platform 50.

[0090] The front positioning component 51 includes a front positioning seat 510 and a front limiting seat 511 that are slidably disposed on the main platform 50 of the main assembly;

[0091] The mid-section positioning component 52 includes a mid-section positioning support 520, a mid-section positioning clamping seat 521, a mid-section positioning seat 522, and a mid-section limiting seat 523 slidably disposed on the main platform 50 of the main assembly.

[0092] The tail section positioning assembly 53 includes a tail end limiting seat 530, a tail section positioning seat 531, and a tail section cover plate clamping seat 532, which are slidably disposed on the main platform 50 of the assembly.

[0093] Specifically, the welding fixture 5 includes a main platform 50, and a front positioning component 51, a middle positioning component 52 and a tail positioning component 53 are sequentially arranged on the main platform 50; the arrangement of the front positioning component 51, the middle positioning component 52 and the tail positioning component 53 corresponds to the overall structure of the boom.

[0094] Specifically, the front positioning assembly 51, used to fix the welded boom fork 101 and boom front section 201, includes a front positioning seat 510 slidably arranged along the length of the main platform 50. The front positioning seat 510 is slidably connected to the main platform 50 via a guide rail slider mechanism, which is the same as described above and will not be repeated. A front limiting seat 511 is provided at the end of the guide rail slider mechanism. The front limiting seat 511 is slidably (guide rail slider mechanism) on the main platform 50, and the sliding direction is different from that of the front positioning seat 510.

[0095] The mid-section positioning component 52, which is arranged adjacent to the front-section positioning component 51, is used to fix the welded mid-section of the boom 301. It includes two mid-section positioning support seats 520, three mid-section positioning clamping seats 521, and a mid-section positioning seat 522, which are arranged on the main platform 50 of the main assembly, and a mid-section limiting seat 523 that is slidably arranged on the main platform 50 of the main assembly. The mid-section positioning clamping seats 521 and the mid-section positioning seats 522 are arranged between the mid-section positioning support seats 520 and the mid-section limiting seat 523.

[0096] The tail section positioning assembly 53 is used to fix the welded boom tail section 401. It includes a tail end limiting seat 530 slidably disposed on the main platform 50 of the assembly, a tail section positioning seat 531 slidably disposed on the main platform 50 of the assembly, and a tail section cover plate clamping seat 532 disposed at the end of the tail section positioning seat 531.

[0097] The front boom fork 101, the front boom section 201, the middle boom section 301, and the tail boom section 401 are sequentially fixed and welded together using the front positioning component 51, the middle positioning component 52, and the tail positioning component 53 to form the boom assembly 501.

[0098] Each component of the boom is welded separately using different welding fixtures, and then assembled using the main welding fixture 5. Each welding fixture is adjustable and can be adjusted according to different boom sizes to meet the welding needs of various boom models. This increases the welding space, reduces the difficulty of clamping and positioning, improves the welding accuracy of the boom, and thus improves product quality. At the same time, the operation is simple, and the welding of each component of the boom is done in stages without affecting each other, which improves the production efficiency and product quality of the boom.

[0099] A welding method for an excavator boom according to the present invention includes the following steps:

[0100] Step 1: Machin the welded parts of boom fork 101, boom front section 201, boom middle section 301, and boom tail section 401 respectively, and machine positioning surfaces and / or positioning holes on each welded part.

[0101] Step 2: Fix the positioning surfaces and positioning holes on the welding parts of the boom fork 101, boom mid-section 301, and boom tail section 401 onto the corresponding welding fixtures, and weld them to form the corresponding components. The welding fixtures include a front fork welding fixture 1 for welding the boom fork 101, a mid-section welding fixture 3 for welding the boom mid-section 301, and a tail section welding fixture 4 for welding the boom tail section 401.

[0102] Step 3: Place the welded boom fork 101 and boom front section 201 from Step 2 onto the same welding fixture (i.e., front section welding fixture 2) for welding.

[0103] Step 4: The components welded in Step 2 and Step 3 are clamped and positioned using the assembly welding fixture 5 and welded together as one unit;

[0104] Step 5: After the boom is assembled and welded, the weld slag is removed and the weld bristles are ground off.

[0105] After steps two and three are completed, some process components are welded on to prevent deformation. Disassembly is then carried out after step four is completed. After step five is completed, the holes corresponding to the welded boom are precision machined and adjusted.

[0106] The above provides a detailed description of the welding device and method for an excavator boom provided by the present invention. Specific examples have been used to illustrate the structure and working principle of the invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A welding device for an excavator boom, characterized in that: Includes a fork welding fixture (1) for machining the boom fork (101); the fork welding fixture (1) includes a fork main platform (10); The fork support (11) is located on the fork main platform (10) and has a U-shaped opening at one end; A fork positioning seat (12) is disposed on both sides of the fork support seat (11), and a baffle support (13) is disposed between the fork positioning seats (12) disposed opposite to each other; each fork positioning seat (12) is provided with a plurality of mounting holes (15) for mounting positioning core (14) and a plurality of side plate support bolts (16). The fork clamping support (17) is slidably positioned in the direction of the U-shaped opening; An angle measuring support (18) is provided on the fork support (11) and at one end where the fork clamping support (17) is located; The fork positioning seat (12) and the fork clamping support (17) are slidably connected to the fork main platform (10) through the fork guide rail slider mechanism (19), and are provided with a limiting member (190) that works in conjunction with the fork guide rail slider mechanism (19). The positioning core (14) has a wedge (140) for fixing the boom fork (101).

2. The excavator boom welding device according to claim 1, characterized in that: It also includes a front welding fixture (2) for machining the boom front section (201) and the boom fork (101); the front welding fixture (2) includes a front main platform (20); Two front sliding platforms (21) are set up and are arranged parallel to each other along the length of the front main platform (20); a front positioning support (22) and a front clamping support (23) are respectively set on each front sliding platform (21). Two U-shaped positioning seats (24) are provided on one side of the front sliding platform (21).

3. The excavator boom welding device according to claim 2, characterized in that: The front positioning support (22) and the front pressing support (23) are slidably connected to the front sliding platform (21); the front sliding platform (21) is slidably connected to the front main platform (20).

4. The excavator boom welding device according to claim 1, characterized in that: It also includes a mid-section welding fixture (3) for processing the mid-section of the boom (301); the mid-section welding fixture (3) includes a mid-section main platform (30), a mid-section clamping seat (31) provided on the mid-section main platform (30), a central shaft positioning seat (32) provided on the same straight line as the mid-section clamping seat (31), a first clamping support (33), a second clamping support (34) and a positioning and height setting seat (35) provided around the central shaft positioning seat (32), and an ear plate positioning seat (36) and a support block (37) provided on one side of the first clamping support (33); the second clamping support (34) and the positioning and height setting seat (35) are slidably connected to the mid-section main platform (30).

5. The excavator boom welding device according to claim 1, characterized in that: It also includes a tail section welding fixture (4) for machining the tail section (401) of the boom; the tail section welding fixture (4) includes a tail section main platform (40). The tail section sliding platform (41) consists of two parallel platforms, which are slidably connected to the tail section main platform (40) respectively. Each tail section sliding platform (41) is provided with a screw clamping seat (42) and a tail section positioning support (43). The tail section U-shaped positioning seat (44) is located at one end of the tail section sliding platform (41).

6. The excavator boom welding device according to claim 1, characterized in that: It also includes a welding fixture (5) for machining the boom assembly (501); the welding fixture (5) includes a main platform (50) of the assembly, and a front positioning component (51), a middle positioning component (52) and a tail positioning component (53) are sequentially arranged on the main platform (50).

7. The excavator boom welding device according to claim 6, characterized in that: The front positioning component (51) includes a front positioning seat (510) and a front limiting seat (511) that are slidably disposed on the main platform (50) of the main assembly. The mid-section positioning component (52) includes a mid-section positioning support (520), a mid-section positioning clamping seat (521), a mid-section positioning seat (522) disposed on the main platform (50) of the main assembly, and a mid-section limiting seat (523) slidably disposed on the main platform (50) of the main assembly. The tail section positioning component (53) includes a tail end limiting seat (530), a tail section positioning seat (531), and a tail section cover plate clamping seat (532) located on the main platform (50) of the main assembly.

8. A method for welding an excavator boom, using the welding apparatus described in any one of claims 1-7, characterized in that: Includes the following steps: Step 1: Machin the welded parts of the boom fork (101), boom front section (201), boom middle section (301), and boom tail section (401) respectively, and machine positioning surfaces and / or positioning holes on each welded part respectively; Step 2: Fix the positioning surfaces and positioning holes on the welding parts of the boom fork (101), boom mid section (301), and boom tail section (401) onto the corresponding welding fixtures respectively, and weld them to form the corresponding components. Step 3: Place the welded boom fork (101) and the boom front section (201) assembled in Step 2 on the same welding fixture for welding; Step 4: The components welded in Step 2 and Step 3 are clamped and positioned using the assembly welding fixture (5) and welded together. Step 5: After the boom is assembled and welded, the weld slag is removed and the weld bristles are ground off.

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