A welding production line for automobile front axle welded parts

Abstract

A welding production line for automobile front axle weldments includes welding workstations 1 and 2, a transmission belt between the workstations, workstations A, B, C, and D, and corresponding welding robots controlled by a PLC control system. Clamps 1, 2, 3, and 4, each installed at the workstation, are each equipped with a positioning mechanism and a clamping mechanism controlled by the PLC control system. This welding production line features a high degree of automation, high clamp positioning accuracy, stable and reliable clamping, and improved welding quality. This reduces the number of operators, effectively reduces auxiliary clamping time, and significantly improves production efficiency, making it suitable for industrialized mass production. It also reduces worker labor intensity and improves production safety.

Description

Technical Field

[0001] The invention relates to an automated production line for welding automobile parts, in particular to a welding production line for automobile front axle welded parts. Background Art

[0002] The front axle weldment of an automobile is an important component of the automobile. It consists of: a front axle crossbeam, a crossbeam sealing plate weldment, a left bracket weldment and a right bracket weldment. During the production process, the left bracket weldment and the right bracket weldment are respectively fixed to the corresponding parts of the front axle crossbeam, and welded to obtain a semi-finished front axle crossbeam. Then, the crossbeam sealing plate weldment is fixed to the corresponding part of the semi-finished front axle crossbeam, and welded again to complete the resistance welding process of the entire front axle weldment, thereby obtaining a finished front axle weldment.

[0003] Traditional manual suspension resistance welding uses a combination of ordinary manual quick-pressing devices and pneumatic clamping to position and compact the parts and components, and finally welds the positioned and compacted front axle weldment with handheld resistance welding tongs. The problems are:

[0004] 1. The parts clamping time is long, the production efficiency is low, and it is not suitable for industrial mass production;

[0005] 2. High labor costs and high labor intensity for workers;

[0006] 3. Handheld welding has poor consistency, unstable welding quality and high scrap rate. Summary of the Invention

[0007] The purpose of the present invention is to provide a welding production line for automobile front axle welded parts to overcome the above-mentioned shortcomings of the existing technology.

[0008] The technical solution adopted by the present invention is: a welding production line for automobile front axle welded parts, including welding workstation No. 1, welding workstation No. 2, a PLC control system and a transmission belt arranged between the welding workstations, welding workstation No. 1 includes station A and station B, station A is correspondingly provided with fixture No. 1 and welding robot No. 1, station B is correspondingly provided with fixture No. 2 and welding robot No. 2, welding workstation No. 2 includes station C and station D, station C is correspondingly provided with fixture No. 3 and welding robot No. 3, station D is correspondingly provided with fixture No. 4 and welding robot No. 4, the welding robot No. 1, welding robot No. 2, welding robot No. 3 and welding robot No. 4 are electrically connected to the PLC control system, and the fixture No. 1, fixture No. 2, fixture No. 3 and fixture No. 4 are respectively provided with a positioning mechanism and a pressing mechanism connected to the PLC control system;

[0009] The No. 1 welding workstation is used to complete the welding of the front axle crossbeam and the left and right bracket weldments. The transmission belt is used to transfer the welded workpiece completed by the No. 1 welding workstation to the No. 2 welding workstation. The No. 2 welding workstation is used to complete the welding of the welded workpiece completed by the No. 1 welding workstation and the sealing plate weldment, wherein:

[0010] The No. 1 fixture at station A is used to perform the first clamping and positioning of the left and right bracket welded parts and the front axle crossbeam for welding by the No. 1 welding robot; the No. 2 fixture at station B is used to perform the second clamping and positioning of the completed parts after welding at station A, and avoid the clamping position of the No. 1 fixture at station A, so that the No. 2 welding robot can weld the parts of station A that cannot be completed due to the obstruction of the No. 1 fixture, and finally complete the welding of the front axle crossbeam and the left and right bracket welded parts;

[0011] The No. 3 fixture at station C is used to perform the first clamping and positioning of the completed workpiece and the sealing plate welded part at welding station No. 1, so that welding robot No. 3 can weld them. The No. 4 fixture at station D is used to perform the second clamping and positioning of the completed workpiece welded at station C, and avoid the clamping position of the No. 3 fixture at station C, so that welding robot No. 4 can weld the parts of station C that could not be welded due to the interference of the No. 3 fixture, and finally complete all the welding of the front axle welded parts to obtain the front axle crossbeam welded parts.

[0012] The No. 1 fixture includes a front axle crossbeam clamping mechanism, a bracket weldment positioning and clamping mechanism, and a swing arm hole positioning mechanism installed on the fixture base; the front axle crossbeam clamping mechanism includes a left crossbeam clamping mechanism I and a right crossbeam clamping mechanism I; the left crossbeam clamping mechanism I is used to clamp the left part of the front axle crossbeam, and the right crossbeam clamping mechanism I is used to clamp the right part of the front axle crossbeam; the bracket weldment positioning and clamping mechanisms are arranged at the four corners of the fixture base, including a left bracket front positioning and clamping mechanism I, a left bracket rear positioning and clamping mechanism I, a right bracket front positioning and clamping mechanism I, and a right bracket rear positioning and clamping mechanism I; the left bracket front positioning and clamping mechanism I is used to position the left bracket weldment φ15.5mm front hole, and press the front part of the left bracket weldment. The left bracket rear positioning and pressing mechanism I is used to locate the φ13mm rear hole of the left bracket weldment and press the rear part of the left bracket weldment, and cooperate with the left bracket front positioning and pressing mechanism I to achieve the positioning and pressing of the left bracket weldment; the right bracket front positioning and pressing mechanism I is used to locate the 15.8×13mm front elliptical hole of the right bracket weldment and press the front part of the right bracket weldment. The right bracket rear positioning and pressing mechanism I is used to locate the 15.8×15mm rear elliptical hole of the right bracket weldment and press the rear part of the right bracket weldment, and cooperate with the right bracket front positioning mechanism I to achieve the positioning and pressing of the right bracket weldment;

[0013] The No. 2 fixture includes a crossbeam pressing mechanism II, a left bracket rear pressing mechanism II, and a right bracket front pressing mechanism II installed on the fixture base. The crossbeam pressing mechanism II is a single-arm pressing mechanism installed in the middle of the fixture base, and is used to press the middle part of the front axle crossbeam; the left bracket rear pressing mechanism II and the right bracket front pressing mechanism II are arranged in a diagonal pressing manner, the left bracket rear pressing mechanism II is installed at the left rear part of the fixture base, and is used to press the rear part of the left bracket weldment, and the right bracket front pressing mechanism II is installed at the right front part of the fixture base, and is used to press the front part of the right bracket weldment;

[0014] The No. 3 fixture includes a bracket weldment positioning and clamping mechanism, a swing arm hole positioning mechanism, and a sealing plate weldment positioning and clamping mechanism III installed on the fixture base; the bracket weldment positioning and clamping mechanisms are arranged at the four corners of the fixture base, including the left bracket front positioning and clamping mechanism III, the left bracket rear positioning and clamping mechanism III, the right bracket front positioning and clamping mechanism III, and the right bracket rear positioning and clamping mechanism III;

[0015] The No. 4 fixture includes a left bracket front positioning mechanism IV, a right bracket rear positioning mechanism IV, a sealing plate welding part left pressing mechanism IV and a sealing plate welding part right pressing mechanism IV installed on the fixture base;

[0016] The left bracket front positioning mechanism IV and the right bracket rear positioning mechanism IV are arranged in a diagonal pressing manner and are used to diagonally position the welded parts completed at the C station.

[0017] Its further technical solution is: the swing arm hole positioning mechanism of the No. 1 fixture includes a left front swing arm hole positioning mechanism I, a left rear swing arm hole positioning mechanism I, a right front swing arm hole positioning mechanism I and a right rear swing arm hole positioning mechanism I; the left front swing arm hole positioning mechanism I is used for coaxial positioning of the front swing arm hole of the left bracket weldment and the front swing arm hole of the front axle crossbeam, the left rear swing arm hole positioning mechanism I is used for coaxial positioning of the rear swing arm hole of the left bracket weldment and the rear swing arm hole of the front axle crossbeam, and cooperates with the left front swing arm hole positioning mechanism I to fix the relative position between the left bracket weldment and the front axle crossbeam; the right front swing arm hole positioning mechanism I is used for coaxial positioning of the front swing arm hole of the right bracket weldment and the front swing arm hole of the front axle crossbeam, and the right rear swing arm hole positioning mechanism I is used for coaxial positioning of the rear swing arm hole of the right bracket weldment and the rear swing arm hole of the front axle crossbeam, and cooperates with the right front swing arm hole positioning mechanism I to fix the relative position between the right bracket weldment and the front axle crossbeam;

[0018] The left bracket front positioning and clamping mechanism III of the No. 3 clamp is used to locate the φ15.5mm front hole of the left bracket welded part and press the front part of the left bracket welded part. The left bracket rear positioning and clamping mechanism III is used to locate the φ13mm rear hole of the left bracket welded part and press the rear part of the left bracket welded part. The left bracket front positioning and clamping mechanism III is used to clamp the left bracket welded part to ensure that the left bracket welded part does not move during the welding process and affect the welding quality; the right bracket front positioning and clamping mechanism III is used to locate the 15.8×13mm front elliptical hole of the right bracket welded part and press the front part of the right bracket welded part. The right bracket rear positioning and clamping mechanism III is used to locate the 15.8×15mm rear elliptical hole of the right bracket welded part and press the rear part of the right bracket welded part. The right bracket front positioning and clamping mechanism III is used to locate the 15.8×15mm rear elliptical hole of the right bracket welded part and press the rear part of the right bracket welded part. The right bracket front positioning and clamping mechanism III is used to clamp the right bracket welded part to ensure that the right bracket welded part does not move during the welding process and affect the welding quality;

[0019] The swing arm hole positioning mechanism of the No. 3 fixture includes a left front swing arm hole positioning mechanism III, a left rear swing arm hole positioning mechanism III, a right front swing arm hole positioning mechanism III and a right rear swing arm hole positioning mechanism III; the left front swing arm hole positioning mechanism III is used for positioning the left front swing arm hole of the left bracket weldment to ensure that the welding deformation of the weldment does not affect the coaxial position of the front and rear swing arm holes; the left rear swing arm hole positioning mechanism III is used for positioning the left rear swing arm hole of the left bracket weldment to ensure that the welding deformation of the weldment does not affect the coaxial position of the front and rear swing arm holes; the right front swing arm hole positioning mechanism III is used for positioning the right front swing arm hole of the right bracket weldment to ensure that the welding deformation of the weldment does not affect the coaxial position of the front and rear swing arm holes; the right rear swing arm hole positioning mechanism III is used for positioning the right front swing arm hole of the right bracket weldment to ensure that the welding deformation of the weldment does not affect the coaxial position of the front and rear swing arm holes;

[0020] The sealing plate welded parts positioning and pressing mechanism III of the No. 3 fixture is located on the sealing plate welded parts pressing arm and is used to position and press the sealing plate welded parts to ensure that the clearance and size position between the sealing plate welded parts and the welded parts meet the design requirements;

[0021] The left bracket front positioning mechanism IV of the No. 4 clamp is installed on the left front part of the clamp base, and the right bracket front positioning mechanism IV is installed on the right rear part of the clamp base. The left clamping mechanism IV of the sealing plate weld part and the right clamping mechanism IV of the sealing plate weld part are used to fix the sealing plate weld part to ensure that the sealing plate weld part does not move during the welding process and affect the quality.

[0022] Furthermore: in the clamp No. 1; the left pressing mechanism of the beam I includes the left pressing cylinder of the beam I, the left pressing arm of the beam I and the left pressing base of the beam I; the right pressing mechanism of the beam I has the same structure as the left pressing mechanism of the beam I, including the right pressing cylinder of the beam I, the right pressing arm of the beam I and the right pressing base of the beam I; the left front positioning mechanism of the swing arm hole I includes the left front positioning cylinder of the swing arm hole I, the left front fixing plate of the swing arm hole I and the left front positioning pin of the swing arm hole I; the right front positioning mechanism of the swing arm hole Ⅰ has the same structure as the left front positioning mechanism Ⅰ of the swing arm hole, including the right front positioning cylinder Ⅰ of the swing arm hole, the right front fixing plate Ⅰ of the swing arm hole and the right front positioning pin Ⅰ of the swing arm hole; the left rear positioning mechanism Ⅰ of the swing arm hole includes the left rear positioning cylinder Ⅰ of the swing arm hole, the left rear fixing plate Ⅰ of the swing arm hole and the left rear positioning pin Ⅰ of the swing arm hole; the right rear positioning mechanism Ⅰ of the swing arm hole has the same structure as the left rear positioning mechanism Ⅰ of the swing arm hole, including the right rear positioning cylinder Ⅰ of the swing arm hole, the right rear fixing plate Ⅰ of the swing arm hole and the right rear positioning pin Ⅰ of the swing arm hole;

[0023] The left bracket front positioning and pressing mechanism I includes a left bracket front pressing cylinder I, a left bracket front pressing arm I, a left bracket front pressing fixing plate I and a left bracket front pressing positioning pin I. When in use, the φ15.5mm front hole of the left bracket weldment is positioned by the left bracket front pressing positioning pin I, and the front part of the left bracket weldment is pressed by the left bracket front pressing cylinder I, the left bracket front pressing arm I and the left bracket front pressing fixing plate I.

[0024] The right bracket front clamping mechanism I has the same structure as the left bracket front clamping mechanism I, and includes a right bracket front clamping cylinder I, a right bracket front clamping arm I, a right bracket front clamping fixing plate I, and a right bracket front clamping locating pin I. During use, the 15.8×13mm front elliptical hole of the right bracket weldment is positioned using the right bracket front clamping locating pin I, and the front portion of the right bracket weldment is clamped using the right bracket front clamping cylinder I, the right bracket front clamping arm I, and the right bracket front clamping fixing plate I.

[0025] The left bracket rear pressing mechanism I includes a left bracket rear pressing cylinder I, a left bracket rear pressing arm I, a left bracket rear pressing fixing plate I and a left bracket rear pressing positioning pin I. When in use, the φ13mm rear hole of the left bracket weldment is positioned by the left bracket rear pressing positioning pin I, and the rear of the left bracket weldment is pressed by the left bracket rear pressing cylinder I, the left bracket rear pressing arm I and the left bracket rear pressing fixing plate I.

[0026] The right bracket rear clamping mechanism I has the same structure as the left bracket rear clamping mechanism I, and includes a right bracket rear clamping cylinder I, a right bracket rear clamping arm I, a right bracket rear clamping fixing plate I, and a right bracket rear clamping positioning pin I. When in use, the 15.8×15mm rear elliptical hole of the right bracket weldment is positioned by the right bracket rear clamping positioning pin I 1904, and the rear portion of the right bracket weldment is clamped by the right bracket rear clamping cylinder I, the right bracket rear clamping arm I 1902, and the right bracket rear clamping fixing plate I 1903.

[0027] In the No. 2 clamp: the crossbeam pressing mechanism II includes a crossbeam pressing cylinder II, a crossbeam pressing arm II and a crossbeam pressing positioning base II; the left bracket rear pressing mechanism II includes a left bracket rear pressing cylinder II, a left bracket rear pressing arm II, a left bracket rear pressing positioning base II and a left bracket rear pressing positioning pin II; the right bracket front pressing mechanism II includes a right bracket front pressing cylinder II, a right bracket front pressing arm II, a right bracket front pressing positioning base II and a right bracket front pressing positioning pin II;

[0028] In the No. 3 fixture: the sealing plate welding part positioning and pressing mechanism III includes: a welding part pressing cylinder III, a welding part pressing arm III, a welding part pressing base III and a welding part positioning pin module III;

[0029] The left bracket front positioning and pressing mechanism III includes a left bracket front pressing cylinder III, a left bracket front pressing arm, a left bracket front pressing fixing plate III and a left bracket front pressing positioning pin III. When in use, the φ15.5mm front hole of the left bracket weldment is positioned by the left bracket front pressing positioning pin III, and the front of the left bracket weldment is pressed by the left bracket front pressing cylinder III, the left bracket front pressing arm and the left bracket front pressing fixing plate III.

[0030] The left bracket rear positioning and pressing mechanism III includes a left bracket rear pressing cylinder III, a left bracket rear pressing arm III, a left bracket rear pressing fixing plate III and a left bracket rear pressing positioning pin III. When in use, the φ13mm rear hole of the left bracket weldment is positioned by the left bracket rear pressing positioning pin III, and the rear of the left bracket weldment is pressed by the left bracket rear pressing cylinder III, the left bracket rear pressing arm III and the left bracket rear pressing fixing plate III;

[0031] The right bracket front positioning and pressing mechanism III includes a right bracket front pressing cylinder III, a right bracket front pressing arm III, a right bracket front pressing fixing plate III and a right bracket front pressing positioning pin III. When in use, the 15.8×13mm front elliptical hole of the right bracket weldment is positioned by the right bracket front pressing positioning pin III, and the front part of the right bracket weldment is pressed by the right bracket front pressing cylinder III, the right bracket front pressing arm III and the right bracket front pressing fixing plate III.

[0032] The right bracket rear positioning and pressing mechanism III includes a right bracket rear pressing cylinder III, a right bracket rear pressing arm III, a right bracket rear pressing fixing plate I and a right bracket rear pressing positioning pin III. When in use, the 15.8×15mm rear elliptical hole of the right bracket weldment is positioned by the right bracket rear pressing positioning pin III, and the rear of the right bracket weldment is pressed by the right bracket rear pressing cylinder III, the right bracket rear pressing arm III and the right bracket rear pressing fixing plate I.

[0033] In the No. 4 fixture: the left bracket front positioning mechanism IV includes a left front connecting plate positioning pin IV and a left bracket front positioning base IV; the right bracket rear positioning mechanism IV has the same structure as the left bracket front positioning mechanism IV, including: a right rear connecting plate positioning pin IV and a right bracket rear positioning base IV;

[0034] The left pressing mechanism IV of the sealing plate welding part includes a left pressing cylinder IV of the sealing plate welding part, a left pressing arm IV of the sealing plate welding part and a left pressing base IV of the sealing plate welding part; the right pressing mechanism IV of the sealing plate welding part has the same structure as the left pressing mechanism IV of the welding part, and includes: a right pressing cylinder IV of the sealing plate welding part, a right pressing arm IV of the sealing plate welding part and a right pressing base IV of the sealing plate welding part.

[0035] Due to the adoption of the above technical solution, compared with the traditional manual suspension resistance welding fixture, the automobile front axle welded parts welding production line of the present invention has the following beneficial effects:

[0036] 1. The present invention relates to a welding production line for automobile front axle weldments. The structure of fixture No. 2 is similar to that of fixture No. 1, except that the swing arm hole positioning mechanism is simplified and eliminated. The left and right bracket clamping mechanisms are changed from a four-corner clamping method to a diagonal clamping method, thereby eliminating the left bracket front clamping mechanism and the right bracket rear clamping mechanism. The crossbeam clamping mechanism of fixture No. 1 is a left-right symmetrical double-arm clamping mechanism, while the crossbeam clamping mechanism of fixture No. 2 is a single-arm middle clamping mechanism, thereby avoiding the clamping area of ​​fixture No. 1. (Similarly, the above The structure of clamp No. 4 is similar to that of clamp No. 3. The difference is that the swing arm hole positioning mechanism and the front axle cross beam sealing plate weldment positioning and clamping mechanism have been simplified and cancelled. The left and right bracket positioning mechanisms have been changed from a four-corner full positioning method to a diagonal positioning method. As a result, the left bracket front positioning mechanism and the right bracket rear positioning mechanism have been cancelled. The clamping positions of the left and right clamping mechanisms of the weldment of clamp No. 4 and the left and right clamping mechanisms of the cross beam of clamp No. 3 are staggered, so that the second clamping welding is not interfered with, which is conducive to improving efficiency and welding quality.

[0037] 2. This invention relates to a welding production line for automobile front axle weldments. Using a PLC control system, the welding fixture automatically positions and clamps the welded parts, which are then fed into the robot for welding. This simplifies the clamping process, saves time for auxiliary clamping, improves production efficiency, reduces the number of operators, and reduces labor intensity. Furthermore, it features a misplacement (or misplacement) prevention function, significantly improving safety and reducing potential safety costs.

[0038] 3. This invention's automotive front axle welding production line utilizes a workstation-based assembly line layout, rationally allocating welding and clamping cycles to further eliminate waiting time between processes. The automated control fixture and welding robot combination facilitates industrial automated mass production.

[0039] 4. The present invention provides a welding production line for automobile front axle welded parts. The welding quality of the products is more stable and consistent than manual welding, and the scrap rate is extremely low.

[0040] The technical features of the automobile front axle welded parts welding production line of the present invention will be further described below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a schematic diagram of the layout of a welding production line for automobile front axle welded parts according to the present invention;

[0042] Figure 2 This is a schematic diagram of the No. 1 fixture structure (3D effect);

[0043] Figure 3 This is a schematic diagram of the No. 2 fixture structure (3D effect);

[0044] Figure 4 This is a schematic diagram of the No. 3 fixture structure (3D effect);

[0045] Figure 5 This is a schematic diagram of the No. 4 fixture structure (3D effect);

[0046] Figures 6 and 7 This is the structural diagram of the left bracket front clamping mechanism I:

[0047] Figure 6 For top view, Figure 7 It is a three-dimensional effect picture;

[0048] Figures 8 and 9 This is the structural diagram of the left bracket front positioning mechanism I: Figure 8 is a side view, Figure 9 It is a three-dimensional effect picture;

[0049] Figures 10 and 11 This is the structural diagram of the left bracket front clamping mechanism I:

[0050] Figure 10 For top view, Figure 11 It is a three-dimensional effect picture;

[0051] Figures 12 and 13 This is the structural diagram of the left bracket rear positioning mechanism I:

[0052] Figure 12 For the main view, Figure 13 is a side view;

[0053] Figures 14 and 15 This is the structural diagram of the left pressing mechanism I of the beam:

[0054] Figure 14 For the main view, Figure 15 is a side view;

[0055] Figures 16 and 17 This is the structural diagram of the right pressing mechanism I of the crossbeam:

[0056] Figure 16 For the main view, Figure 17 It is a three-dimensional effect picture;

[0057] Figures 18 and 19 This is a structural diagram of the right bracket front positioning mechanism I:

[0058] Figure 18 For the main view, Figure 19 It is a three-dimensional effect picture;

[0059] Figures 20 and 21 This is a structural diagram of the front clamping mechanism I of the right bracket:

[0060] Figure 20 For the three-dimensional effect diagram, Figure 21 It is a top view;

[0061] Figures 22 and 23 This is the structural diagram of the right bracket rear positioning mechanism I:

[0062] Figure 22 For the main view, Figure 23 It is a three-dimensional effect picture;

[0063] Figures 24 and 25 This is a structural diagram of the right bracket rear clamping mechanism I:

[0064] Figure 24 For the main view, Figure 25 It is a top view;

[0065] Figures 26 and 27 This is the structural diagram of the left bracket rear clamping mechanism II:

[0066] Figure 26 For the main view, Figure 27 It is a three-dimensional effect picture;

[0067] Figures 28 and 29 This is the structural diagram of the beam pressing mechanism II:

[0068] Figure 28 For the main view, Figure 29 It is a three-dimensional effect picture;

[0069] Figures 30 and 31 This is a structural diagram of the front clamping mechanism II of the right bracket:

[0070] Figure 30 For the main view, Figure 31 It is a three-dimensional effect picture;

[0071] Figures 32 and 33 This is the structural diagram of the left bracket front clamping mechanism III:

[0072] Figure 32 For the main view, Figure 33 It is a three-dimensional effect picture;

[0073] Figures 34 and 35 This is the structural diagram of the left bracket front positioning mechanism III:

[0074] Figure 34 For the main view, Figure 35 It is a three-dimensional effect picture;

[0075] Figures 36 and 37 This is the structural diagram of the left bracket rear positioning mechanism III:

[0076] Figure 36 For the main view, Figure 37 It is a three-dimensional effect picture;

[0077] Figures 38 and 39 This is the structural diagram of the left bracket rear clamping mechanism III:

[0078] Figure 38 For the three-dimensional effect diagram, Figure 39 It is a top view;

[0079] Figures 40 and 41 Schematic diagram of the sealing plate welding parts positioning and clamping mechanism III:

[0080] Figure 40 For the main view, Figure 41 It is a three-dimensional effect picture;

[0081] Figures 42 and 43 This is the structural diagram of the right bracket front positioning mechanism III:

[0082] Figure 42 For top view, Figure 43 It is a three-dimensional effect picture;

[0083] Figures 44 and 45 This is the structural diagram of the right bracket front clamping mechanism III:

[0084] Figure 44 For the three-dimensional effect diagram, Figure 45 It is a top view;

[0085] Figures 46 and 47 This is the structural diagram of the right bracket rear positioning mechanism III:

[0086] Figure 46 For the main view, Figure 47 It is a three-dimensional effect picture;

[0087] Figures 48 and 49 This is the structural diagram of the right bracket rear clamping mechanism III:

[0088] Figure 48 For the main view, Figure 49 It is a top view;

[0089] Figures 50 and 51 This is a schematic diagram of the structure of the left bracket front positioning mechanism IV:

[0090] Figure 50 For the main view, Figure 51 It is a three-dimensional effect picture;

[0091] Figures 52 and 53 This is a structural diagram of the left clamping mechanism IV of the welded part:

[0092] Figure 52 For the main view, Figure 53 is a side view;

[0093] Figures 54 and 55 This is a schematic diagram of the structure of the right clamping mechanism IV of the welded part:

[0094] Figure 54 For the main view, Figure 55 It is a three-dimensional effect picture;

[0095] Figures 56 and 57 This is a schematic diagram of the structure of the rear positioning mechanism IV of the right bracket:

[0096] Figure 56 For the main view, Figure 57 is a side view;

[0097] Figures 58 to 62 Schematic diagram of the welding workpiece structure:

[0098] Figure 58 For the front axle crossbeam, Figure 59 This is the left bracket welded part. Figure 60 This is the right bracket welding part. Figure 61 It is a welded part for the crossbeam cover plate. Figure 62 This is the completed front axle weldment.

[0099] In the picture:

[0100] 1—Fixture No. 1, 2—Fixture No. 2, 3—Fixture No. 3, 4—Fixture No. 4, 5—Control box, 101—Welding robot No. 1, 102—Welding robot No. 2, 103—Welding robot No. 3, 104—Welding robot No. 4, 105—Operation table, 106—Drive belt, 107—Guardrail, 6—Front axle crossbeam, 7—Crossbeam cover plate weldment, 81—Left bracket weldment, 82—Right bracket weldment, 9—Front axle weldment;

[0101] 10—Left bracket front positioning and pressing mechanism I: 1001—Left bracket front pressing cylinder I, 1002—Left bracket front pressing arm I, 1003—Left bracket front pressing fixing plate I, 1004—Left bracket front pressing positioning pin I;

[0102] 11—Swing arm hole left front positioning mechanism I: 1101—Swing arm hole left front positioning cylinder I, 1102—Swing arm hole left front fixing plate I, 1103—Swing arm hole left front positioning pin I;

[0103] 12—Swing arm hole left rear positioning mechanism I: 1201—Swing arm hole left rear positioning cylinder I, 1202—Swing arm hole left rear fixing plate I, 1203—Swing arm hole left rear positioning pin I;

[0104] 13—Left bracket rear positioning and pressing mechanism I: 1301—Left bracket rear pressing cylinder I, 1302—Left bracket rear pressing arm I, 1303—Left bracket rear pressing fixing plate I, 1304—Left bracket rear pressing positioning pin I;

[0105] 14—Beam left pressing mechanism Ⅰ: 1401—Beam left pressing cylinder Ⅰ, 1402—Beam left pressing arm Ⅰ, 1403—Beam left pressing base Ⅰ,

[0106] 15—crossbeam right pressing mechanism I: 1501—crossbeam right pressing cylinder I, 1502—crossbeam right pressing arm I, 1503—crossbeam right pressing base I;

[0107] 16—Swing arm hole right front positioning mechanism I: 1601—Swing arm hole right front positioning cylinder I, 1602—Swing arm hole right front fixing plate I, 1603—Swing arm hole right front positioning pin I;

[0108] 17—Right bracket front positioning and pressing mechanism I: 1701—Right bracket front pressing cylinder I, 1702—Right bracket front pressing arm I, 1703—Right bracket front pressing fixing plate I, 1704—Right bracket front pressing positioning pin I;

[0109] 18—Swing arm hole right rear positioning mechanism I: 1801—Swing arm hole right rear positioning cylinder I, 1802—Swing arm hole right rear fixing plate I, 1803—Swing arm hole right rear positioning pin I;

[0110] 19—Right bracket rear positioning and pressing mechanism I: 1901—Right bracket rear pressing cylinder I, 1902—Right bracket rear pressing arm I, 1903—Right bracket rear pressing fixing plate I, 1904—Right bracket rear pressing positioning pin I;

[0111] 20—Left bracket rear pressing mechanism II: 2001—Left bracket rear pressing cylinder II, 2002—Left bracket rear pressing arm II, 2003—Left bracket rear pressing positioning base II, 2004—Left bracket rear pressing positioning pin II;

[0112] 21—Beam pressing mechanism II: 2101—Beam pressing cylinder II, 2102—Beam pressing arm II, 2103—Beam pressing positioning base II;

[0113] 22—Right bracket front pressing mechanism II: 2201—Right bracket front pressing cylinder II, 2202—Right bracket front pressing arm II, 2203—Right bracket front pressing positioning base II, 2204—Right bracket front pressing positioning pin II;

[0114] 30—Left bracket front positioning and pressing mechanism III (structure is the same as 10): 3001—Left bracket front pressing cylinder III, 3002—Left bracket front pressing fixing plate III, 3003—Left bracket front pressing arm III, 3004—Left bracket front pressing positioning pin III;

[0115] 31 - Left front swing arm hole positioning mechanism III (same structure as 11): 3101 - Left front swing arm hole positioning cylinder III, 3102 - Left front swing arm hole fixing plate III, 3103 - Left front swing arm hole positioning pin III;

[0116] 32 - Swing arm hole left rear positioning mechanism III (structure is the same as 12): 3201 - Swing arm hole left rear positioning cylinder III, 3202 - Swing arm hole left rear fixing plate III, 3203 - Swing arm hole left rear positioning pin III;

[0117] 33 - Left bracket rear positioning and pressing mechanism III (structure is the same as 13): 3301 - Left bracket rear pressing cylinder III, 3302 - Left bracket rear pressing arm III, 3303 - Left bracket rear pressing fixing plate III, 3304 - Left bracket rear pressing positioning pin III;

[0118] 34—Sealing plate welding part positioning and pressing mechanism III: 3401—Welding part pressing cylinder III, 3402—Welding part pressing arm III, 3403—Welding part pressing base III, 3404—Welding part positioning pin module III;

[0119] 35 - Right front positioning mechanism of swing arm hole III (structure is the same as 16): 3501 - Right front positioning cylinder of swing arm hole III, 3502 - Right front fixing plate of swing arm hole III, 3503 - Right front positioning pin of swing arm hole III;

[0120] 36 - Right bracket front positioning and pressing mechanism III (structure is the same as 17): 3601 - Right bracket front pressing cylinder III, 3602 - Right bracket front pressing arm, 3603 - Right bracket front pressing fixing plate III, 3604 - Right bracket front pressing positioning pin III;

[0121] 37 - Right rear positioning mechanism of swing arm hole III (structure is the same as 18): 3701 - Right rear positioning cylinder of swing arm hole III, 3702 - Right rear fixing plate of swing arm hole III, 3703 - Right rear positioning pin of swing arm hole III;

[0122] 38—Right bracket rear positioning and pressing mechanism III: 3801—Right bracket rear pressing cylinder III, 3802—Right bracket rear pressing arm III, 3803—Right bracket rear pressing fixing plate III, 3804—Right bracket rear pressing positioning pin III;

[0123] 40—Left bracket front positioning mechanism IV: 4001—Left front connecting plate positioning pin IV, 4002—Left bracket front positioning base IV;

[0124] 43—Right bracket rear positioning mechanism IV: 4301—Right rear connecting plate positioning pin IV, 4302—Right bracket rear positioning base IV.

[0125] 41—Left pressing mechanism of sealing plate welding part IV: 4101—Left pressing cylinder of sealing plate welding part IV, 4102—Left pressing arm of sealing plate welding part IV, 4103—Left pressing base of sealing plate welding part IV;

[0126] 42—Right pressing mechanism of sealing plate welding part IV: 4201—Right pressing cylinder of sealing plate welding part IV, 4202—Right pressing arm of sealing plate welding part IV, 4203—Right pressing base of sealing plate welding part IV. DETAILED DESCRIPTION

[0127] A welding production line for automobile front axle welded parts includes a No. 1 welding workstation, a No. 2 welding workstation, a PLC control system, and a transmission belt arranged between the welding workstations. The No. 1 welding workstation includes a station A and a station B. The No. 1 fixture and the No. 1 welding robot are correspondingly provided at the A station, and the No. 2 fixture and the No. 2 welding robot are correspondingly provided at the B station. The No. 2 welding workstation includes a station C and a station D. The No. 3 fixture and the No. 3 welding robot are correspondingly provided at the C station, and the No. 4 fixture and the No. 4 welding robot are correspondingly provided. The No. 1 welding robot, the No. 2 welding robot, the No. 3 welding robot, and the No. 4 welding robot are electrically connected to the PLC control system. The No. 1 fixture, the No. 2 fixture, the No. 3 fixture, and the No. 4 fixture are respectively provided with a positioning mechanism and a pressing mechanism connected to the PLC control system.

[0128] The No. 1 welding workstation is used to complete the welding of the front axle crossbeam and the left and right bracket weldments. The transmission belt is used to transfer the welded workpiece completed by the No. 1 welding workstation to the No. 2 welding workstation. The No. 2 welding workstation is used to complete the welding of the welded workpiece completed by the No. 1 welding workstation and the sealing plate weldment, wherein:

[0129] The No. 1 fixture at station A is used to perform the first clamping and positioning of the left and right bracket welded parts and the front axle crossbeam for welding by the No. 1 welding robot; the No. 2 fixture at station B is used to perform the second clamping and positioning of the completed parts after welding at station A, and avoid the clamping position of the No. 1 fixture at station A, so that the No. 2 welding robot can weld the parts of station A that cannot be completed due to the obstruction of the No. 1 fixture, and finally complete the welding of the front axle crossbeam and the left and right bracket welded parts;

[0130] Clamp No. 3 of station C is used to clamp and position the finished parts of welding station No. 1 and the sealing plate welded parts for the first time, so that welding robot No. 3 can weld them. Clamp No. 4 of station D is used to clamp and position the finished parts after welding at station C for the second time, and avoid the clamping position of clamp No. 3 of station C, so that welding robot No. 4 can weld the parts of station C that cannot be welded due to the obstruction and interference of clamp No. 3, and finally complete all the welding of the front axle welded parts to obtain the front axle crossbeam welded parts.

[0131] The No. 1 fixture includes a front axle crossbeam clamping mechanism, a bracket weldment positioning and clamping mechanism, and a swing arm hole positioning mechanism installed on the fixture base; the front axle crossbeam clamping mechanism includes a left crossbeam clamping mechanism I14 and a right crossbeam clamping mechanism I15; the left crossbeam clamping mechanism I14 is used to clamp the left portion of the front axle crossbeam to ensure that the front axle crossbeam and the left bracket weldment are tightly fitted; the right crossbeam clamping mechanism I15 is used to clamp the right portion of the front axle crossbeam to ensure that the front axle crossbeam and the right bracket weldment are tightly fitted;

[0132] The bracket welded parts positioning and clamping mechanism is arranged at the four corners of the fixture base, including the left bracket front positioning and clamping mechanism I10, the left bracket rear positioning and clamping mechanism I13, the right bracket front positioning and clamping mechanism I17 and the right bracket rear positioning and clamping mechanism I19; the left bracket front positioning and clamping mechanism I10 is used to locate the φ15.5mm front hole of the left bracket welded parts and clamp the front of the left bracket welded parts, and the left bracket rear positioning and clamping mechanism I13 is used to locate the φ13mm rear hole of the left bracket welded parts and clamp The rear part of the left bracket weldment cooperates with the left bracket front positioning and pressing mechanism I to achieve positioning and pressing of the left bracket weldment; the right bracket front positioning and pressing mechanism I 17 is used to locate the 15.8×13mm front elliptical hole of the right bracket weldment and press the front part of the right bracket weldment. The right bracket rear positioning and pressing mechanism I 19 is used to locate the 15.8×15mm rear elliptical hole of the right bracket weldment and press the rear part of the right bracket weldment, and cooperates with the right bracket front positioning mechanism I to achieve positioning and pressing of the right bracket weldment;

[0133] The No. 2 fixture includes a crossbeam pressing mechanism II 21, a left bracket rear pressing mechanism II 20, and a right bracket front pressing mechanism II 22 installed on the fixture base. The crossbeam pressing mechanism II is a single-arm pressing mechanism installed in the middle of the fixture base, used to press the middle part of the front axle crossbeam; the left bracket rear pressing mechanism II 20 and the right bracket front pressing mechanism II 22 are arranged in a diagonal pressing manner, the left bracket rear pressing mechanism II is installed at the left rear part of the fixture base, used to press the rear part of the left bracket weldment, and the right bracket front pressing mechanism II is installed at the right front part of the fixture base, used to press the front part of the right bracket weldment;

[0134] The No. 3 fixture includes a bracket welded component positioning and clamping mechanism, a swing arm hole positioning mechanism, and a sealing plate welded component positioning and clamping mechanism III 34 installed on the fixture base. Its structure is basically the same as that of the No. 1 fixture, except that the left crossbeam clamping mechanism 14 and the right crossbeam clamping mechanism 15 are cancelled, and the sealing plate welded component positioning and clamping mechanism III 34 is added;

[0135] The No. 4 fixture includes a left bracket front positioning mechanism IV40, a right bracket rear positioning mechanism IV43, a left pressing mechanism IV41 for the sealing plate welded part, and a right pressing mechanism IV42 for the sealing plate welded part installed on the fixture base; the left bracket front positioning mechanism IV40 and the right bracket rear positioning mechanism IV43 are arranged in a diagonal pressing manner to diagonally position the welded part completed at station C;

[0136] The swing arm hole positioning mechanism of the No. 1 clamp includes a swing arm hole left front positioning mechanism I11, a swing arm hole left rear positioning mechanism I12, a swing arm hole right front positioning mechanism I16 and a swing arm hole right rear positioning mechanism I18;

[0137] The left front positioning mechanism I11 of the swing arm hole is used for coaxial positioning of the front swing arm hole of the left bracket weldment and the front swing arm hole of the front axle crossbeam. The left rear positioning mechanism I12 of the swing arm hole is used for coaxial positioning of the rear swing arm hole of the left bracket weldment and the rear swing arm hole of the front axle crossbeam, and cooperates with the left front positioning mechanism I of the swing arm hole to fix the relative position between the left bracket weldment and the front axle crossbeam. The right front positioning mechanism I16 of the swing arm hole is used for coaxial positioning of the front swing arm hole of the right bracket weldment and the front swing arm hole of the front axle crossbeam. The right rear positioning mechanism I18 of the swing arm hole is used for coaxial positioning of the rear swing arm hole of the right bracket weldment and the rear swing arm hole of the front axle crossbeam, and cooperates with the right front positioning mechanism I of the swing arm hole to fix the relative position between the right bracket weldment and the front axle crossbeam.

[0138] The No. 3 fixture's bracket weldment positioning and clamping mechanisms are located at the four corners of the fixture base and include a left bracket front positioning and clamping mechanism III30, a left bracket rear positioning and clamping mechanism III33, a right bracket front positioning and clamping mechanism III36, and a right bracket rear positioning and clamping mechanism III38. The left bracket front positioning and clamping mechanism III30 is used to locate the φ15.5mm front hole of the left bracket weldment and clamp the front of the left bracket weldment. The left bracket rear positioning and clamping mechanism III33 is used to locate the φ13mm rear hole of the left bracket weldment and clamp the rear of the left bracket weldment. Together with the left bracket front positioning and clamping mechanism III, the left bracket weldment is clamped to ensure that the left bracket weldment does not shift during welding, thereby affecting weld quality.

[0139] The right bracket front positioning and clamping mechanism III 36 is used to locate the 15.8×13mm front elliptical hole of the right bracket weldment and compress the front of the right bracket weldment. The right bracket rear positioning and clamping mechanism III 38 is used to locate the 15.8×15mm rear elliptical hole of the right bracket weldment and compress the rear of the right bracket weldment. Together with the right bracket front positioning and clamping mechanism III 36, the right bracket weldment is compressed to ensure that the right bracket weldment does not move during welding, which would affect the welding quality.

[0140] The swing arm hole positioning mechanisms of fixture No. 3 include a left front swing arm hole positioning mechanism III31, a left rear swing arm hole positioning mechanism III32, a right front swing arm hole positioning mechanism III35, and a right rear swing arm hole positioning mechanism III37. The left front swing arm hole positioning mechanism III31 is used to position the left front swing arm hole of the left bracket weldment, ensuring that welding deformation of the weldment does not affect the coaxial position of the front and rear swing arm holes. The left rear swing arm hole positioning mechanism III32 is used to position the left rear swing arm hole of the left bracket weldment, ensuring that welding deformation of the weldment does not affect the coaxial position of the front and rear swing arm holes. The right front swing arm hole positioning mechanism III35 is used to position the right front swing arm hole of the right bracket weldment, ensuring that welding deformation of the weldment does not affect the coaxial position of the front and rear swing arm holes.

[0141] The right rear swing arm hole positioning mechanism III37 is used to position the right front swing arm hole of the right bracket weldment, ensuring that welding deformation of the weldment does not affect the coaxial position of the front and rear swing arm holes; the sealing plate weldment positioning and pressing mechanism III34 is located on the sealing plate weldment pressure arm, and is used to position and press the sealing plate weldment to ensure that the clamping clearance and dimensional position of the sealing plate weldment meet the design requirements;

[0142] The left bracket front positioning mechanism IV of the No. 4 clamp is installed on the left front part of the clamp base, and the right bracket front positioning mechanism IV is installed on the right rear part of the clamp base. The left clamping mechanism IV41 of the sealing plate weld part and the right clamping mechanism IV42 of the sealing plate weld part are used to fix the sealing plate weld part to ensure that the sealing plate weld part does not move during the welding process and affect the quality.

[0143] In the clamp No. 1; the left crossbeam pressing mechanism Ⅰ14 includes a left crossbeam pressing cylinder Ⅰ1401, a left crossbeam pressing arm Ⅰ1402 and a left crossbeam pressing base Ⅰ1403; the right crossbeam pressing mechanism Ⅰ15 has the same structure as the left crossbeam pressing mechanism Ⅰ14, including a right crossbeam pressing cylinder Ⅰ1501, a right crossbeam pressing arm Ⅰ1502 and a right crossbeam pressing base Ⅰ1503; the left front positioning mechanism Ⅰ11 of the swing arm hole includes a left front positioning cylinder Ⅰ1101 of the swing arm hole, a left front fixing plate Ⅰ1102 of the swing arm hole and a left front positioning pin Ⅰ1103 of the swing arm hole; the right front positioning mechanism Ⅰ16 of the swing arm hole The swing arm hole left front positioning mechanism I11 has the same structure as the swing arm hole right front positioning cylinder I1601, the swing arm hole right front fixing plate I1602 and the swing arm hole right front positioning pin I1603; the swing arm hole left rear positioning mechanism I12 includes the swing arm hole left rear positioning cylinder I1201, the swing arm hole left rear fixing plate I1202 and the swing arm hole left rear positioning pin I1203; the swing arm hole right rear positioning mechanism I18 has the same structure as the swing arm hole left rear positioning mechanism I12, including the swing arm hole right rear positioning cylinder I1801, the swing arm hole right rear fixing plate I1802 and the swing arm hole right rear positioning pin I1803;

[0144] The left bracket front positioning and pressing mechanism I10 includes a left bracket front pressing cylinder I1001, a left bracket front pressing arm I1002, a left bracket front pressing fixing plate I1003 and a left bracket front pressing positioning pin I1004; when in use, the φ15.5mm front hole of the left bracket weldment is positioned by the left bracket front pressing positioning pin I, and the front part of the left bracket weldment is pressed by the left bracket front pressing cylinder I, the left bracket front pressing arm I and the left bracket front pressing fixing plate I;

[0145] The right bracket front pressing mechanism I17 has the same structure as the left bracket front pressing mechanism I10, and includes a right bracket front pressing cylinder I1701, a right bracket front pressing arm I1702, a right bracket front pressing fixing plate I1703, and a right bracket front pressing positioning pin I1704. During use, the 15.8×13mm front elliptical hole of the right bracket weldment is positioned by the right bracket front pressing positioning pin I, and the front portion of the right bracket weldment is pressed by the right bracket front pressing cylinder I, the right bracket front pressing arm I, and the right bracket front pressing fixing plate I.

[0146] The left bracket rear positioning and pressing mechanism I13 includes a left bracket rear pressing cylinder I1301), a left bracket rear pressing arm I1302, a left bracket rear pressing fixing plate I1303, and a left bracket rear pressing positioning pin I1304. When in use, the φ13mm rear hole of the left bracket weldment is positioned by the left bracket rear pressing positioning pin I, and the rear portion of the left bracket weldment is pressed by the left bracket rear pressing cylinder I, the left bracket rear pressing arm I, and the left bracket rear pressing fixing plate I.

[0147] The right bracket rear pressing mechanism I 19 has the same structure as the left bracket rear pressing mechanism I 13, including a right bracket rear pressing cylinder I 1901, a right bracket rear positioning pressing arm I 1902, a right bracket rear pressing fixing plate I 1903, and a right bracket rear pressing positioning pin I 1904. When in use, the 15.8×15mm rear elliptical hole of the right bracket weldment is positioned by the right bracket rear pressing positioning pin I, and the rear portion of the right bracket weldment is pressed by the right bracket rear pressing cylinder I, the right bracket rear pressing arm I, and the right bracket rear pressing fixing plate I.

[0148] In the No. 2 clamp: the crossbeam pressing mechanism II21 includes a crossbeam pressing cylinder II2101, a crossbeam pressing arm II2102 and a crossbeam pressing positioning base II2103; the left bracket rear pressing mechanism II20 includes a left bracket rear pressing cylinder II2001, a left bracket rear pressing arm II2002, a left bracket rear pressing positioning base II2003 and a left bracket rear pressing positioning pin II2004; the right bracket front pressing mechanism II22 includes a right bracket front pressing cylinder II2201, a right bracket front pressing arm II2202, a right bracket front pressing positioning base II2203 and a right bracket front pressing positioning pin II2204;

[0149] In the clamp No. 3, the sealing plate welding part positioning and pressing mechanism III34 includes: a welding part pressing cylinder III3401, a welding part pressing arm III3402, a welding part pressing base III3403 and a welding part positioning pin module III3404;

[0150] The left bracket front positioning and pressing mechanism III30 includes a left bracket front pressing cylinder III3001, a left bracket front pressing arm 3002, a left bracket front pressing fixing plate III3003 and a left bracket front pressing positioning pin III3004. When in use, the left bracket front pressing positioning pin III is used to position the φ15.5mm front hole of the left bracket weldment, and the left bracket front pressing cylinder III, the left bracket front pressing arm and the left bracket front pressing fixing plate III are used to press the front of the left bracket weldment.

[0151] The left bracket rear positioning and pressing mechanism III33 includes a left bracket rear pressing cylinder III3301, a left bracket rear pressing arm III3302, a left bracket rear pressing fixing plate III3303 and a left bracket rear pressing positioning pin III3304. When in use, the φ13mm rear hole of the left bracket weldment is positioned by the left bracket rear pressing positioning pin III, and the rear of the left bracket weldment is pressed by the left bracket rear pressing cylinder III, the left bracket rear pressing arm III and the left bracket rear pressing fixing plate III.

[0152] The right bracket front positioning and pressing mechanism III36 includes a right bracket front pressing cylinder III3601, a right bracket front pressing arm III3602, a right bracket front pressing fixing plate III3603 and a right bracket front pressing positioning pin III3604. When in use, the 15.8×13mm front elliptical hole of the right bracket weldment is positioned by the right bracket front pressing positioning pin III, and the front part of the right bracket weldment is pressed by the right bracket front pressing cylinder III, the right bracket front pressing arm III and the right bracket front pressing fixing plate III3603.

[0153] The right bracket rear positioning and pressing mechanism III38 includes a right bracket rear pressing cylinder III3801, a right bracket rear pressing arm III3802, a right bracket rear pressing fixing plate III3803, and a right bracket rear pressing positioning pin III3804. When in use, the 15.8×15mm rear elliptical hole of the right bracket weldment is positioned by the right bracket rear pressing positioning pin III, and the rear portion of the right bracket weldment is pressed by the right bracket rear pressing cylinder III, the right bracket rear pressing arm III, and the right bracket rear pressing fixing plate I.

[0154] In the No. 4 fixture: the left bracket front positioning mechanism IV40 includes: a left front connecting plate positioning pin IV4001 and a left bracket front positioning base IV4002; the right bracket rear positioning mechanism IV43 has the same structure as the left bracket front positioning mechanism IV40, including: a right rear connecting plate positioning pin IV4301 and a right bracket rear positioning base IV4302;

[0155] The left pressing mechanism IV41 of the sealing plate welding part includes: a left pressing cylinder IV4101 of the sealing plate welding part, a left pressing arm IV4102 of the sealing plate welding part and a left pressing base IV4103 of the sealing plate welding part; the right pressing mechanism IV42 of the sealing plate welding part has the same structure as the left pressing mechanism IV of the welding part, and includes: a right pressing cylinder IV4201 of the sealing plate welding part, a right pressing arm IV4202 of the sealing plate welding part and a right pressing base IV4203 of the sealing plate welding part.

[0156] The process steps of the automobile front axle welded parts welding production line of the present invention are as follows:

[0157] The first step is to put the left bracket welding parts on the left bracket front clamping mechanism Ⅰ10 and the left bracket rear clamping mechanism Ⅰ13 at the No. 1 welding robot workstation A station No. 1 fixture respectively, and put the right bracket welding parts on the right bracket front clamping mechanism Ⅰ17 and the right bracket rear clamping mechanism Ⅰ19, and position the left bracket welding parts and the right bracket welding parts with the front axle crossbeam through the left bracket welding parts positioning clamping mechanism and the swing arm hole positioning mechanism; start the PLC control system, set the PLC to control the left bracket front clamping mechanism Ⅰ10, the left bracket welding parts The positioning and clamping mechanism Ⅰ13 after the assembly, the positioning and clamping mechanism Ⅰ17 before the right bracket welding assembly, the positioning and clamping mechanism Ⅰ19 after the right bracket welding assembly, the right front positioning mechanism Ⅰ16 of the swing arm hole, the right rear positioning mechanism Ⅰ (18) of the swing arm hole, the left front positioning mechanism Ⅰ11 of the swing arm hole, the left rear positioning mechanism Ⅰ12 of the swing arm hole, the left clamping mechanism Ⅰ14 of the crossbeam and the right clamping mechanism Ⅰ15 of the crossbeam start the clamping and positioning work. After the welding is completed, the clamping parts of the fixture are automatically opened and the parts are taken out by the set PLC, and then transferred to the next process.

[0158] Step 2: At the No. 2 fixture of the B station of the No. 1 welding robot workstation, the welded parts completed by the No. 1 fixture are placed on the positioning clamping mechanism of the No. 2 fixture: the rear clamping mechanism II20 of the left bracket welded parts and the front clamping mechanism II22 of the right bracket welded parts. The PLC control system is started and the PLC is set to control the crossbeam clamping mechanism II21, the rear clamping mechanism II20 of the left bracket and the front clamping mechanism II22 of the right bracket to clamp and clamp. After the welding is completed, the PLC is set to control the clamping parts of the fixture to automatically open and remove the parts, completing the welding work of the No. 1 welding robot workstation, and then transferring the parts to the No. 2 welding robot workstation via the conveyor belt.

[0159] Step 3: At the No. 3 fixture of the C station of the No. 2 welding robot workstation, the welded parts completed by the No. 2 fixture are placed on the left bracket welded part rear positioning and clamping mechanism III 30, the left bracket welded part front positioning and clamping mechanism III 33, and the right bracket welded part rear positioning and clamping mechanism III 36, and the right bracket welded part front positioning and clamping mechanism III 38, and the sealing plate welded part and the welded parts are positioned and clamped by the sealing plate welded part positioning and clamping mechanism III 34;

[0160] Start the PLC control system, which controls the left bracket welding part rear positioning and clamping mechanism III30, the left bracket welding part front positioning and clamping mechanism III33, the sealing plate welding part positioning and clamping mechanism III34, the right bracket welding part rear positioning and clamping mechanism III36, the right bracket welding part front positioning and clamping mechanism III38, the swing arm hole right rear positioning mechanism III35, the swing arm hole right front positioning mechanism III37, the swing arm hole left rear positioning mechanism III31, the swing arm hole left front positioning mechanism III32, the swing arm hole left front positioning mechanism I11, the swing arm hole left rear positioning mechanism I12, and starts the clamping and positioning work. After welding is completed, the PLC is set to control the fixture clamping parts to automatically open and remove the parts, and then transfer to fixture No. 4 of station D;

[0161] The fourth step is to place the welded parts completed by the No. 3 fixture on the left bracket front positioning mechanism IV40 and the right bracket rear positioning mechanism IV43 of the No. 4 fixture at the D station of the No. 2 welding robot workstation at the No. 2 welding robot workstation at the No. 3 welding robot respectively; when started externally, the left clamping mechanism IV41 and the right clamping mechanism IV42 of the sealing plate welding part are controlled by the PLC to start the clamping and positioning work. After the welding is completed, the PLC is set to control the clamping parts of the fixture to automatically open and take out the parts to complete the welding task.

Claims

1. A welding production line for automobile front axle welded parts, characterized by: It includes welding workstation No. 1, welding workstation No. 2, a PLC control system and a transmission belt arranged between the welding workstations, welding workstation No. 1 includes station A and station B, station A is correspondingly provided with fixture No. 1 and welding robot No. 1, station B is correspondingly provided with fixture No. 2 and welding robot No. 2, welding workstation No. 2 includes station C and station D, station C is correspondingly provided with fixture No. 3 and welding robot No. 3, station D is correspondingly provided with fixture No. 4 and welding robot No. 4, the welding robot No. 1, welding robot No. 2, welding robot No. 3 and welding robot No. 4 are electrically connected to the PLC control system, and the fixture No. 1, fixture No. 2, fixture No. 3 and fixture No. 4 are respectively provided with a positioning mechanism and a pressing mechanism connected to the PLC control system; The No. 1 welding workstation is used to complete the welding of the front axle crossbeam and the left and right bracket weldments. The transmission belt is used to transfer the welded workpiece completed by the No. 1 welding workstation to the No. 2 welding workstation. The No. 2 welding workstation is used to complete the welding of the welded workpiece completed by the No. 1 welding workstation and the sealing plate weldment, wherein: The No. 1 fixture at station A is used to perform the first clamping and positioning of the left and right bracket welded parts and the front axle crossbeam for welding by the No. 1 welding robot; the No. 2 fixture at station B is used to perform the second clamping and positioning of the completed parts after welding at station A, and avoid the clamping position of the No. 1 fixture at station A, so that the No. 2 welding robot can weld the parts of station A that cannot be completed due to the obstruction of the No. 1 fixture, and finally complete the welding of the front axle crossbeam and the left and right bracket welded parts; The No. 3 fixture at station C is used to perform the first clamping and positioning of the completed workpiece and the sealing plate welded part at welding station No. 1, for welding by welding robot No.

3. The No. 4 fixture at station D is used to perform the second clamping and positioning of the completed workpiece welded at station C, and avoids the clamping position of the No. 3 fixture at station C, allowing welding robot No. 4 to weld the parts of station C that could not be completed due to the interference of the No. 3 fixture, and finally complete the welding of all the front axle welded parts to obtain the front axle crossbeam welded parts. The No. 1 fixture includes a front axle crossbeam clamping mechanism, a bracket weldment positioning clamping mechanism, and a swing arm hole positioning mechanism installed on the fixture base; the front axle crossbeam clamping mechanism includes a left crossbeam clamping mechanism I (14) and a right crossbeam clamping mechanism I (15): the left crossbeam clamping mechanism I (14) is used to clamp the left part of the front axle crossbeam, and the right crossbeam clamping mechanism I (15) is used to clamp the right part of the front axle crossbeam; The bracket welding part positioning and clamping mechanism of the No. 1 clamp is arranged at the four corners of the clamp base, including the left bracket front positioning and clamping mechanism I (10), the left bracket rear positioning and clamping mechanism I (13), the right bracket front positioning and clamping mechanism I (17) and the right bracket rear positioning and clamping mechanism I (19); the left bracket front positioning and clamping mechanism I (10) is used to locate the φ15.5mm front hole of the left bracket welding part and clamp the front part of the left bracket welding part, and the left bracket rear positioning and clamping mechanism I (13) is used to locate the φ13m m rear hole, and press the rear part of the left bracket weldment, cooperate with the left bracket front positioning and pressing mechanism I to achieve the positioning and pressing of the left bracket weldment, the right bracket front positioning and pressing mechanism I (17) is used to locate the 15.8×13mm front elliptical hole of the right bracket weldment, and press the front part of the right bracket weldment, the right bracket rear positioning and pressing mechanism I (19) is used to locate the 15.8×15mm rear elliptical hole of the right bracket weldment, and press the rear part of the right bracket weldment, and cooperate with the right bracket front positioning mechanism I to achieve the positioning and pressing of the right bracket weldment; The No. 2 fixture includes a crossbeam pressing mechanism II (21), a left bracket rear pressing mechanism II (20), and a right bracket front pressing mechanism II (22) installed on the fixture base; the crossbeam pressing mechanism II is a single-arm pressing mechanism installed in the middle of the fixture base for pressing the middle part of the front axle crossbeam, the left bracket rear pressing mechanism II (20) and the right bracket front pressing mechanism II (22) are arranged in a diagonal pressing manner, the left bracket rear pressing mechanism II is installed at the left rear part of the fixture base for pressing the rear part of the left bracket weldment, and the right bracket front pressing mechanism II is installed at the right front part of the fixture base for pressing the front part of the right bracket weldment; The No. 3 fixture includes a bracket welded component positioning and clamping mechanism, a swing arm hole positioning mechanism, and a sealing plate welded component positioning and clamping mechanism III (34) installed on the fixture base; the bracket welded component positioning and clamping mechanism is arranged at the four corners of the fixture base, including a left bracket front positioning and clamping mechanism III (30), a left bracket rear positioning and clamping mechanism III (33), a right bracket front positioning and clamping mechanism III (36), and a right bracket rear positioning and clamping mechanism III (38); The No. 4 fixture comprises a left bracket front positioning mechanism IV (40), a right bracket rear positioning mechanism IV (43), a sealing plate welding part left pressing mechanism IV (41) and a sealing plate welding part right pressing mechanism IV (42) installed on the fixture base; the left bracket front positioning mechanism IV (40) and the right bracket rear positioning mechanism IV (43) are arranged in a diagonal pressing manner to perform diagonal positioning on the welded part completed at the C station.

2. The automobile front axle welded parts welding production line according to claim 1, characterized in that: The swing arm hole positioning mechanism of the No. 1 fixture includes a swing arm hole left front positioning mechanism I (11), a swing arm hole left rear positioning mechanism I (12), a swing arm hole right front positioning mechanism I (16) and a swing arm hole right rear positioning mechanism I (18); the swing arm hole left front positioning mechanism I (11) is used for coaxial positioning of the front swing arm hole of the left bracket welded part and the front swing arm hole of the front axle crossbeam, and the swing arm hole left rear positioning mechanism I (12) is used for coaxial positioning of the rear swing arm hole of the left bracket welded part and the rear swing arm hole of the front axle crossbeam. The arm holes are coaxially positioned, and cooperate with the left front positioning mechanism I of the swing arm hole to fix the relative position between the left bracket weldment and the front axle crossbeam. The right front positioning mechanism I (16) of the swing arm hole is used to coaxially position the front swing arm hole of the right bracket weldment and the front swing arm hole of the front axle crossbeam. The right rear positioning mechanism I (18) of the swing arm hole is used to coaxially position the rear swing arm hole of the right bracket weldment and the rear swing arm hole of the front axle crossbeam, and cooperate with the right front positioning mechanism I of the swing arm hole to fix the relative position between the right bracket weldment and the front axle crossbeam. The left bracket front positioning and pressing mechanism III (30) of the No. 3 clamp is used to position the φ15.5mm front hole of the left bracket welded part and press the front part of the left bracket welded part. The left bracket rear positioning and pressing mechanism III (33) is used to position the φ13mm rear hole of the left bracket welded part and press the rear part of the left bracket welded part. The left bracket welded part is pressed together with the left bracket front positioning and pressing mechanism III to ensure that the left bracket welded part does not move during the welding process and affect the welding quality. The right bracket front positioning and pressing mechanism III (36) is used to position the 15.8×13mm front elliptical hole of the right bracket welded part and press the front part of the right bracket welded part. The right bracket rear positioning and pressing mechanism III (38) is used to position the 15.8×15mm rear elliptical hole of the right bracket welded part and press the rear part of the right bracket welded part. The right bracket front positioning and pressing mechanism III (36) is used to position the 15.8×15mm rear elliptical hole of the right bracket welded part and press the rear part of the right bracket welded part. Press the right bracket weldment tightly to ensure that the right bracket weldment does not move during welding and affect the welding quality; The swing arm hole positioning mechanism of the No. 3 fixture includes a swing arm hole left front positioning mechanism III (31), a swing arm hole left rear positioning mechanism III (32), a swing arm hole right front positioning mechanism III (35) and a swing arm hole right rear positioning mechanism III (37); the swing arm hole left front positioning mechanism III (31) is used for positioning the left front swing arm hole of the left bracket welded part to ensure that welding deformation of the welded part does not affect the coaxial position of the front and rear swing arm holes; the swing arm hole left rear positioning mechanism III (32) is used for positioning the left rear swing arm hole of the left bracket welded part to ensure that welding deformation of the welded part does not affect the coaxial position of the front and rear swing arm holes; the swing arm hole right front positioning mechanism III (35) is used for positioning the right front swing arm hole of the right bracket welded part to ensure that welding deformation of the welded part does not affect the coaxial position of the front and rear swing arm holes; the swing arm hole right rear positioning mechanism III (37) is used for positioning the right front swing arm hole of the right bracket welded part to ensure that welding deformation of the welded part does not affect the coaxial position of the front and rear swing arm holes; The sealing plate welded part positioning and pressing mechanism III (34) of the No. 3 clamp is located on the sealing plate welded part pressing arm and is used to position and press the sealing plate welded part to ensure that the clearance and size position between the sealing plate welded part and the welded part meet the design requirements; The left bracket front positioning mechanism IV (40) of the No. 4 clamp is installed at the left front part of the clamp base, and the right bracket front positioning mechanism IV is installed at the right rear part of the clamp base; the left pressing mechanism IV (41) and the right pressing mechanism IV (42) of the sealing plate welding part are used to fix the sealing plate welding part to ensure that the sealing plate welding part does not move during the welding process and affect the quality.

3. The automobile front axle welded parts welding production line according to claim 2, characterized in that: In the clamp No. 1, the left crossbeam pressing mechanism I (14) includes a left crossbeam pressing cylinder I (1401), a left crossbeam pressing arm I (1402) and a left crossbeam pressing base I (1403); the right crossbeam pressing mechanism I (15) has the same structure as the left crossbeam pressing mechanism I (14), including a right crossbeam pressing cylinder I (1501), a right crossbeam pressing arm I (1502) and a right crossbeam pressing base I (1503); the left front positioning mechanism I (11) of the swing arm hole includes a left front positioning cylinder I (1101), a left front fixing plate I (1102) of the swing arm hole and a left front positioning pin I (1103) of the swing arm hole; the right front positioning mechanism I (16) of the swing arm hole The swing arm hole left front positioning mechanism I (11) has the same structure as the swing arm hole left front positioning cylinder I (1601), the swing arm hole right front fixing plate I (1602) and the swing arm hole right front positioning pin I (1603); the swing arm hole left rear positioning mechanism I (12) includes the swing arm hole left rear positioning cylinder I (1201), the swing arm hole left rear fixing plate I (1202) and the swing arm hole left rear positioning pin I (1203); the swing arm hole right rear positioning mechanism I (18) has the same structure as the swing arm hole left rear positioning mechanism I (12), including the swing arm hole right rear positioning cylinder I (1801), the swing arm hole right rear fixing plate I (1802) and the swing arm hole right rear positioning pin I (1803); The left bracket front positioning and pressing mechanism I (10) comprises a left bracket front pressing cylinder I (1001), a left bracket front pressing arm I (1002), a left bracket front pressing fixing plate I (1003) and a left bracket front pressing positioning pin I (1004); when in use, the φ15.5 mm front hole of the left bracket welded part is positioned by the left bracket front pressing positioning pin I, and the front part of the left bracket welded part is pressed by the left bracket front pressing cylinder I, the left bracket front pressing arm I and the left bracket front pressing fixing plate I; The right bracket front positioning and pressing mechanism I (17) has the same structure as the left bracket front positioning and pressing mechanism I (10), including a right bracket front pressing cylinder I (1701), a right bracket front pressing arm I (1702), a right bracket front pressing fixing plate I (1703) and a right bracket front pressing positioning pin I (1704); when in use, the 15.8×13mm front elliptical hole of the right bracket weldment is positioned by the right bracket front pressing positioning pin I, and the front part of the right bracket weldment is pressed by the right bracket front pressing cylinder I, the right bracket front pressing arm I and the right bracket front pressing fixing plate I; The left bracket rear positioning and pressing mechanism I (13) comprises a left bracket rear pressing cylinder I (1301), a left bracket rear pressing arm I (1302), a left bracket rear pressing fixing plate I (1303) and a left bracket rear pressing positioning pin I (1304); when in use, the φ13mm rear hole of the left bracket welded part is positioned by the left bracket rear pressing positioning pin I, and the rear part of the left bracket welded part is pressed by the left bracket rear pressing cylinder I, the left bracket rear pressing arm I and the left bracket rear pressing fixing plate I; The right bracket rear positioning and clamping mechanism I (19) has the same structure as the left bracket rear positioning and clamping mechanism I (13), including a right bracket rear clamping cylinder I (1901), a right bracket rear clamping arm I (1902), a right bracket rear clamping fixing plate I (1903) and a right bracket rear clamping positioning pin I (1904); when in use, the 15.8×15mm rear elliptical hole of the right bracket weldment is positioned by the right bracket rear clamping positioning pin I (1904), and the rear part of the right bracket weldment is clamped by the right bracket rear clamping cylinder I (1901), the right bracket rear clamping arm I (1902) and the right bracket rear clamping fixing plate I (1903); In the No. 2 clamp: the crossbeam pressing mechanism II (21) includes a crossbeam pressing cylinder II (2101), a crossbeam pressing arm II (2102) and a crossbeam pressing positioning base II (2103); the left bracket rear pressing mechanism II (20) includes a left bracket rear pressing cylinder II (2001), a left bracket rear pressing arm II (2002), a left bracket rear pressing positioning base II (2003) and a left bracket rear pressing positioning pin II (2004); the right bracket front pressing mechanism II (22) includes a right bracket front pressing cylinder II (2201), a right bracket front pressing arm II (2202), a right bracket front pressing positioning base II (2203) and a right bracket front pressing positioning pin II (2204); In the clamp No. 3: the sealing plate welding part positioning and pressing mechanism III (34) includes: a welding part pressing cylinder III (3401), a welding part pressing arm III (3402), a welding part pressing base III (3403) and a welding part positioning pin module III (3404); The left bracket front positioning and pressing mechanism III (30) comprises a left bracket front pressing cylinder III (3001), a left bracket front pressing arm (3002), a left bracket front pressing fixing plate III (3003) and a left bracket front pressing positioning pin III (3004). When in use, the φ15.5 mm front hole of the left bracket welded part is positioned by the left bracket front pressing positioning pin III, and the front part of the left bracket welded part is pressed by the left bracket front pressing cylinder III, the left bracket front pressing arm and the left bracket front pressing fixing plate III. The left bracket rear positioning and pressing mechanism III (33) comprises a left bracket rear pressing cylinder III (3301), a left bracket rear pressing arm III (3302), a left bracket rear pressing fixing plate III (3303) and a left bracket rear pressing positioning pin III (3304). When in use, the φ13mm rear hole of the left bracket weldment is positioned by the left bracket rear pressing positioning pin III, and the rear portion of the left bracket weldment is pressed by the left bracket rear pressing cylinder III, the left bracket rear pressing arm III and the left bracket rear pressing fixing plate III. The right bracket front positioning and pressing mechanism III (36) comprises a right bracket front pressing cylinder III (3601), a right bracket front pressing arm III (3602), a right bracket front pressing fixing plate III (3603) and a right bracket front pressing positioning pin III (3604). When in use, the 15.8×13mm front elliptical hole of the right bracket weldment is positioned by the right bracket front pressing positioning pin III, and the front part of the right bracket weldment is pressed by the right bracket front pressing cylinder III, the right bracket front pressing arm III and the right bracket front pressing fixing plate III (3603); The right bracket rear positioning and pressing mechanism III (38) comprises a right bracket rear pressing cylinder III (3801), a right bracket rear pressing arm III (3802), a right bracket rear pressing fixing plate III (3803) and a right bracket rear pressing positioning pin III (3804). When in use, the 15.8×15mm rear elliptical hole of the right bracket weldment is positioned by the right bracket rear pressing positioning pin III, and the rear part of the right bracket weldment is pressed by the right bracket rear pressing cylinder III (3801), the right bracket rear pressing arm III (3802) and the right bracket rear pressing fixing plate III (3803); In the No. 4 fixture: the left bracket front positioning mechanism IV (40) includes: a left front connecting plate positioning pin IV (4001) and a left bracket front positioning base IV (4002); the right bracket rear positioning mechanism IV (43) has the same structure as the left bracket front positioning mechanism IV (40), and includes: a right rear connecting plate positioning pin IV (4301) and a right bracket rear positioning base IV (4302); The left pressing mechanism IV (41) of the sealing plate welding part comprises: a left pressing cylinder IV (4101) of the sealing plate welding part, a left pressing arm IV (4102) of the sealing plate welding part and a left pressing base IV (4103) of the sealing plate welding part; the right pressing mechanism IV (42) of the sealing plate welding part has the same structure as the left pressing mechanism IV of the welding part and comprises: a right pressing cylinder IV (4201) of the sealing plate welding part, a right pressing arm IV (4202) of the sealing plate welding part and a right pressing base IV (4203) of the sealing plate welding part.

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