Fixture for automatic welding of automobile rear door reinforcing plate

Abstract

The utility model provides a fixture for automatic welding of an automobile rear door reinforcing plate, which comprises a main mounting seat, clamping components and a control component, a plurality of clamping components are fixed on the main mounting seat, and the clamping components comprise a first clamping component, a second clamping component, a third clamping component, a fourth clamping component and a fifth clamping component. Any one of the first clamping assembly, the second clamping assembly, the third clamping assembly, the fourth clamping assembly and the fifth clamping assembly conducts clamping through a clamping air cylinder, the clamping assemblies clamp the rear door reinforcing plate, the control assembly is connected with the main installation base, and a pneumatic control valve base in the control assembly is connected with the multiple clamping air cylinders. An air cylinder FRL in the control assembly is connected with an air source, a FRL protective cover is fixed outside the air cylinder FRL, and a control valve protective cover is fixed outside the pneumatic control valve seat. According to the clamp for automatic welding of the automobile rear door reinforcing plate, accurate and stable clamping can be achieved, the accuracy of the welding position is guaranteed, and the welding quality is improved.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of automobile manufacturing welding technology especially relates to a clamp for the automatic welding of automobile rear door reinforcing plate. BACKGROUND

[0002] The automobile rear door reinforcing plate is an important component of the vehicle body structure, and its welding quality directly affects the strength, sealing property and safety of the door assembly. At present, automatic welding equipment has been widely used in vehicle body welding processes. The positioning accuracy, stability and adaptability of the welding fixture, which is the core tooling of automatic welding, directly determine the welding efficiency and product quality.

[0003] At present, the clamps are mostly fixed structures, which are difficult to ensure that the reinforcing plate does not displace during the entire welding process. Manual operation of the clamp for clamping not only has low efficiency, but also causes differences in clamping effect each time due to different operation habits and forces of different operators, thereby affecting the consistency of welding quality and the overall efficiency of the production line. SUMMARY

[0004] Therefore, the utility model aims at providing a clamp for the automatic welding of automobile rear door reinforcing plate to solve the problem that the clamps are mostly fixed structures, which are difficult to ensure that the reinforcing plate does not displace during the entire welding process, manual operation of the clamp for clamping not only has low efficiency, but also causes differences in clamping effect each time due to different operation habits and forces of different operators, thereby affecting the consistency of welding quality and the overall efficiency of the production line.

[0005] To achieve the above-mentioned purpose, the technical scheme of the utility model is as follows:

[0006] The utility model provides a clamp for the automatic welding of automobile rear door reinforcing plate, which comprises a main mounting seat, a clamping assembly and a control assembly. The main mounting seat is fixed with a plurality of clamping assemblies, including a first clamping assembly, a second clamping assembly, a third clamping assembly, a fourth clamping assembly and a fifth clamping assembly. Any clamping assembly is clamped by a clamping cylinder. The clamping assembly clamps the rear door reinforcing plate. The control assembly is connected to the main mounting seat. The pneumatic control valve seat in the control assembly is connected to a plurality of clamping cylinders. The cylinder three-piece in the control assembly is connected to a gas source. The cylinder three-piece is externally fixed with a three-piece protective cover. The pneumatic control valve seat is externally fixed with a control valve protective cover.

[0007] Further, in the first clamping assembly, the clamping fixed seat is locked on the main mounting seat, the first connecting plate is locked with the clamping fixed seat, the upper surface of the first connecting plate is locked with the first clamping plate, and the first connecting plate is connected with the second connecting plate through the second connecting shaft, the first clamping plate is an L-shaped block, the first connecting plate is fixed with the first clamping cylinder body through the second cylinder connecting piece, the piston rod of the first clamping cylinder is connected with the first cylinder connecting piece, the first cylinder connecting piece is connected with the third connecting plate through the first connecting shaft, the first clamping plate is installed at the opposite position of the end of the third connecting plate, the third connecting plate is locked with the second connecting plate, the bent section of the third connecting plate connected with the first clamping plate is higher than the bent section of the second connecting plate, the first clamping assembly is clamped at the center of the shorter reinforcing plate without a notch in the rear door reinforcing plate, and the first clamping assembly is also clamped at the edge of the longer reinforcing plate with a long notch in the rear door reinforcing plate.

[0008] Further, in the third clamping assembly, the clamping fixed seat is locked on the main mounting seat, the first connecting plate is locked with the clamping fixed seat, the upper surface of the first connecting plate is locked with the first clamping plate, and the first connecting plate is connected with the second connecting plate through the second connecting shaft, the first clamping plate is an L-shaped block, the first connecting plate is fixed with the third clamping cylinder body through the second cylinder connecting piece, the piston rod of the third clamping cylinder is connected with the first cylinder connecting piece, the first cylinder connecting piece is connected with the third connecting plate through the first connecting shaft, the first clamping plate is installed at the opposite position of the end of the third connecting plate, the third connecting plate is locked with the second connecting plate, the bent section of the third connecting plate connected with the first clamping plate is higher than the bent section of the second connecting plate, the first connecting plate is locked with the first clamping plate, a rectangular groove is arranged at the position of the first clamping plate, first mounting holes are arranged on the sides of the rectangular groove, a first connecting seat is locked at the first mounting holes, a pin fixing seat is connected with the first connecting seat, a fixed pin is slidably connected to the upper part of the pin fixing seat, a first lifting cylinder is fixed to the lower part of the pin fixing seat, and the piston rod of the first lifting cylinder is connected with the fixed pin.

[0009] Further, in the fifth clamping assembly, the clamping fixed seat is locked on the main mounting seat, the first connecting plate is locked with the clamping fixed seat, the upper surface of the first connecting plate is locked with the second clamping plate, and the second connecting plate is connected with the second connecting plate through a second connecting shaft, the first connecting plate is fixed with the fifth clamping cylinder body through a second cylinder connecting piece, the first cylinder connecting piece is connected with the piston rod of the fifth clamping cylinder, the first cylinder connecting piece is connected with the third connecting plate through a first connecting shaft, the end of the third connecting plate is connected with the third clamping plate, the third clamping plate is installed with the second clamping plate in the opposite position, the middle part of the third clamping plate is provided with a groove, the second clamping plate is in the shape of a cuboid, the third connecting plate is locked with the second connecting plate, the bending section of the third connecting plate connected with the third clamping plate is higher than the bending section of the second connecting plate, a plurality of second mounting holes are arranged on the front surface of the first connecting plate, the second mounting holes are locked with the second connecting seat, the second connecting seat is connected with the pin fixed seat, the upper part of the pin fixed seat is slidably connected with the fixed pin, the first lifting cylinder is fixed on the lower part of the pin fixed seat, and the piston rod of the first lifting cylinder is connected with the fixed pin.

[0010] Further, in the fourth clamping assembly, the clamping fixed seat is locked on the main mounting seat, the first connecting plate is locked with the clamping fixed seat, the upper surface of the first connecting plate is locked with the second clamping plate, and the second connecting plate is connected with the second connecting plate through a second connecting shaft, the first connecting plate is fixed with the fourth clamping cylinder body through a second cylinder connecting piece, the first cylinder connecting piece is connected with the piston rod of the fourth clamping cylinder, the first cylinder connecting piece is connected with the third connecting plate through a first connecting shaft, the end of the third connecting plate is connected with the third clamping plate, and the third clamping plate is installed with the second clamping plate in the opposite position, the middle part of the third clamping plate is provided with a groove, the second clamping plate is in the shape of a cuboid, the third connecting plate is locked with the second connecting plate, the bending section of the third connecting plate connected with the third clamping plate is higher than the bending section of the second connecting plate, and the fourth clamping assembly is symmetrically arranged at the middle installation position of the longer reinforcing plate with a slot in the rear door reinforcing plate.

[0011] Further, in the main mounting seat, the first mounting plate is locked with the clamping fixed seat, the first mounting plate is connected with the second mounting plate through a connecting fence, the inside of the connecting fence is supported by horizontally and longitudinally arranged connecting I-shaped steel, the bottom of the second mounting plate is locked with a supporting backing plate, the bottom of the supporting backing plate is connected with a supporting square steel, the supporting square steel is installed with a fixed square plate, the fixed square plate is connected with a square backing plate through a screw rod, the side surface of the fixed square plate is locked with a folded plate connecting block, the folded plate connecting block is locked with the vertical section of a supporting folded plate, and four lifting lugs are symmetrically arranged on the upper surface of the first mounting plate.

[0012] Compared with the prior art, the clamp for automatic welding of the automobile rear door reinforcing plate has the following advantages:

[0013] The utility model discloses set up multiple clamping assembly (first to fifth clamping assembly), and each clamping assembly clamps through clamping cylinder. Multiple clamping points can fix the rear door reinforcing plate from different positions, and evenly disperse stress, avoid reinforcing plate to move because of uneven stress or external force influence in the welding process, thereby realize accurate and stable clamping, guarantee the accuracy of the welding position, improve the welding quality.

[0014] The utility model discloses control assembly links with main mounting seat, links through pneumatic control valve seat and a plurality of clamping cylinder, realizes the centralized control to clamping cylinder. This makes the whole clamping process can realize automation, need not manual operation clamping device one by one, improved production efficiency. Meanwhile, the consistency of the force and action of each clamping is guaranteed by automatic control, thereby the stability of the welding quality is improved.

[0015] The utility model discloses cylinder triad in control assembly links with gas source, and cylinder triad can filter, pressure regulating and lubrication treatment to the compressed air of entering system, guarantee that the air of entering cylinder is clean, pressure stable and has good lubricity, thereby prolongs the service life of cylinder, reduces the production stagnation because of cylinder breakdown. Meanwhile, triad protective cover is fixed outside cylinder triad, and control valve protective cover is fixed outside pneumatic control valve seat, can prevent the damage of outside dust, sundries etc. to it, further improve the reliability and stability of equipment. BRIEF DESCRIPTION OF DRAWINGS

[0016] The accompanying drawings, which form a part of this description, are included to provide a further understanding of the principles of the application and will be described in detail herein. It is expressly understood that the drawings are included solely for purposes of illustrating the exemplary embodiments of the application and are not intended to be limiting in any way.

[0017] In the drawings:

[0018] Figure 1 The overall axis measurement schematic view of the clamp for the automatic welding of the automobile rear door reinforcing plate is described in the utility model embodiment.

[0019] Figure 2 The main mounting seat axis measurement schematic view in the clamp for the automatic welding of the automobile rear door reinforcing plate is described in the utility model embodiment.

[0020] Figure 3 The installation schematic view of the first clamping assembly in the clamp for the automatic welding of the automobile rear door reinforcing plate is described in the utility model embodiment.

[0021] Figure 4 The first clamping assembly axis measurement schematic view in the clamp for the automatic welding of the automobile rear door reinforcing plate is described in the utility model embodiment.

[0022] Figure 5 The second clamping assembly and the third clamping assembly installation schematic view in the clamp for automatic welding of the automobile rear door reinforcing plate according to the embodiment of the utility model;

[0023] Figure 6 The third clamping assembly shaft measurement schematic view in the clamp for automatic welding of the automobile rear door reinforcing plate according to the embodiment of the utility model;

[0024] Figure 7 The first clamping assembly, the fourth clamping assembly and the fifth clamping assembly installation schematic view in the clamp for automatic welding of the automobile rear door reinforcing plate according to the embodiment of the utility model;

[0025] Figure 8 The fifth clamping assembly shaft measurement schematic view in the clamp for automatic welding of the automobile rear door reinforcing plate according to the embodiment of the utility model;

[0026] Figure 9 The fourth clamping assembly shaft measurement schematic view in the clamp for automatic welding of the automobile rear door reinforcing plate according to the embodiment of the utility model.

[0027] BRIEF DESCRIPTION OF THE DRAWINGS

[0028] 1, square base plate; 2, second mounting plate; 3, first mounting plate; 4, pneumatic control valve seat; 5, control valve protective cover; 6, cylinder three joint; 7, three joint protective cover; 8, support flap; 9, first clamping assembly; 10, rear door reinforcing plate; 11, support square steel; 12, lifting lug; 13, connecting I-beam; 14, connecting coaming; 15, support base plate; 16, flap connecting block; 17, clamping fixed seat; 18, first connecting plate; 19, first clamping cylinder; 20, first cylinder connecting piece; 21, second connecting plate; 22, third connecting plate; 23, first clamping plate; 24, second cylinder connecting piece; 25, second clamping assembly; 26, third clamping assembly; 27, third clamping cylinder; 28, second clamping cylinder; 29, positioning pin; 30, first lifting cylinder; 31, pin fixed seat; 32, first connecting seat; 33, fourth clamping assembly; 34, fifth clamping assembly; 35, fourth clamping cylinder; 36, fifth clamping cylinder; 37, second clamping plate; 38, third clamping plate; 39, second connecting seat. DETAILED DESCRIPTION

[0029] It should be noted that the embodiments in the utility model and the features in the embodiments can be combined with each other without conflict.

[0030] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or positional relationship shown based on the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model. In addition, the terms "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features limited by "first", "second" and the like can explicitly or implicitly include one or more features. In the description of the utility model, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0031] In the description of the utility model, it should be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood through specific circumstances.

[0032] The utility model will be described in detail below with reference to the drawings and in combination with embodiments.

[0033] Referring to Figures 1-9 As shown in the figure, the embodiment provides a kind of clamp for automobile rear door reinforcing plate automatic welding, comprising, main mounting seat, clamping component, control component, several clamping components are fixed on main mounting seat, including first clamping component 9, second clamping component 25, third clamping component 26, fourth clamping component 33, fifth clamping component 34, first clamping component 9, second clamping component 25, third clamping component 26, fourth clamping component 33, fifth clamping component 34, any clamping component is clamped by clamping cylinder, clamping component clamps rear door reinforcing plate 10, control component is connected with main mounting seat, pneumatic control valve seat 4 in control component is connected with several clamping cylinders, cylinder three joint pieces 6 in control component are connected with gas source, cylinder three joint pieces 6 external fixed three joint pieces protective cover 7, pneumatic control valve seat 4 external fixed control valve protective cover 5.

[0034] Specifically, in the first clamping assembly 9, the clamping fixed seat 17 is locked on the main mounting seat, the first connecting plate 18 is locked with the clamping fixed seat 17, the upper surface of the first connecting plate 18 is locked with the first clamping plate 23, and the first connecting plate 18 is connected with the second connecting plate 21 through the second connecting shaft. The first clamping plate 23 is an L-shaped block, the first connecting plate 18 is fixed with the cylinder body of the first clamping cylinder 19 through the second cylinder connecting piece 24, the piston rod of the first clamping cylinder 19 is connected with the first cylinder connecting piece 20, the first cylinder connecting piece 20 is connected with the third connecting plate 22 through the first connecting shaft, the third connecting plate 22 is installed with the first clamping plate 23 at the opposite position of the end of the first clamping plate 23, the third connecting plate 22 is locked with the second connecting plate 21, the bending section of the third connecting plate 22 connected with the first clamping plate 23 is higher than the bending section locked with the second connecting plate 21, the first clamping assembly 9 is clamped at the center of the shorter reinforcing plate without a notch in the rear door reinforcing plate 10, and the first clamping assembly 9 is also clamped at the edge of the longer reinforcing plate provided with a long notch in the rear door reinforcing plate 10.

[0035] Specifically, in the third clamping assembly 26, the clamping fixed seat 17 is locked on the main mounting seat, the first connecting plate 18 is locked with the clamping fixed seat 17, the upper surface of the first connecting plate 18 is locked with the first clamping plate 23, and the first connecting plate 18 is connected with the second connecting plate 21 through the second connecting shaft. The first clamping plate 23 is an L-shaped block, the first connecting plate 18 is fixed with the cylinder body of the third clamping cylinder 27 through the second cylinder connecting piece 24, the piston rod of the third clamping cylinder 27 is connected with the first cylinder connecting piece 20, the first cylinder connecting piece 20 is connected with the third connecting plate 22 through the first connecting shaft, the third connecting plate 22 is installed with the first clamping plate 23 at the opposite position of the end of the first clamping plate 23, the third connecting plate 22 is locked with the second connecting plate 21, the bending section of the third connecting plate 22 connected with the first clamping plate 23 is higher than the bending section locked with the second connecting plate 21, the first connecting plate 18 is provided with a rectangular groove at the position locked with the first clamping plate 23, the side surface of the rectangular groove is provided with a plurality of first mounting holes, the first mounting holes are locked with the first connecting seat 32, the first connecting seat 32 is connected with the pin fixed seat 31, the upper part of the pin fixed seat 31 is slidingly connected with the fixed pin 29, the first lifting cylinder 30 is fixed at the lower part of the pin fixed seat 31, and the piston rod of the first lifting cylinder 30 is connected with the fixed pin 29.

[0036] Specifically, in the fifth clamping assembly 34, the clamping fixed seat 17 is locked on the main mounting seat, the first connecting plate 18 is locked with the clamping fixed seat 17, the upper surface of the first connecting plate 18 is locked with the second clamping plate 37, and the first connecting plate 18 is fixed with the cylinder body of the fifth clamping cylinder 36 through the second cylinder connecting piece 24. The piston rod of the fifth clamping cylinder 36 is connected with the first cylinder connecting piece 20, the first cylinder connecting piece 20 is connected with the third connecting plate 22 through the first connecting shaft, the end of the third connecting plate 22 is connected with the third clamping plate 38, the third clamping plate 38 is installed opposite to the second clamping plate 37, the third clamping plate 38 has a groove in the middle, the second clamping plate 37 is in the shape of a cuboid, the third connecting plate 22 is locked with the second connecting plate 21, the bending section of the third connecting plate 22 connected with the third clamping plate 38 is higher than the bending section locked with the second connecting plate 21, a plurality of second mounting holes are arranged on the front surface of the first connecting plate 18, the second mounting holes are locked with the second connecting seat 39, the second connecting seat 39 is connected with the pin fixed seat 31, the upper part of the pin fixed seat 31 is slidingly connected with the fixed pin 29, the first lifting cylinder 30 is fixed on the lower part of the pin fixed seat 31, and the piston rod of the first lifting cylinder 30 is connected with the fixed pin 29. The fifth clamping assembly 34 is symmetrically arranged at the position where the positioning pin hole is arranged on the longer reinforcing plate with a longer notch in the rear door reinforcing plate 10, and the fixed pin 29 is fixed in the positioning pin hole beside the middle notch of the longer reinforcing plate.

[0037] Specifically, in the fourth clamping assembly 33, the clamping fixed seat 17 is locked on the main mounting seat, the first connecting plate 18 is locked with the clamping fixed seat 17, the upper surface of the first connecting plate 18 is locked with the second clamping plate 37, and the first connecting plate 18 is fixed with the cylinder body of the fourth clamping cylinder 35 through the second cylinder connecting piece 24. The piston rod of the fourth clamping cylinder 35 is connected with the first cylinder connecting piece 20, the first cylinder connecting piece 20 is connected with the third connecting plate 22 through the first connecting shaft, the end of the third connecting plate 22 is connected with the third clamping plate 38, and the third clamping plate 38 is installed opposite to the second clamping plate 37. The third clamping plate 38 has a groove in the middle, the second clamping plate 37 is in the shape of a cuboid, the third connecting plate 22 is locked with the second connecting plate 21, the bending section of the third connecting plate 22 connected with the third clamping plate 38 is higher than the bending section locked with the second connecting plate 21, the fourth clamping assembly 33 is symmetrically arranged at the middle mounting position of the longer reinforcing plate with a notch in the rear door reinforcing plate 10.

[0038] Specifically, in this embodiment, the first mounting plate 3 is locked and clamped in the main mounting seat 17, the first mounting plate 3 is connected with the second mounting plate 2 through the connecting coaming 14, the inside of the connecting coaming 14 is supported by the transverse and longitudinal connecting I-beams 13, the bottom of the second mounting plate 2 is locked and supported by the supporting pad plate 15, the bottom of the supporting pad plate 15 is connected with the supporting square steel 11, the supporting square steel is installed and fixed with the square plate, the square plate is connected with the square pad plate 1 through the screw rod, the fixed square plate is locked with the folded plate connecting block 16 on the side, the folded plate connecting block 16 is locked with the vertical section of the supporting folded plate 8, and four lifting lugs 12 are symmetrically arranged on the upper surface of the first mounting plate 3.

[0039] The fixture for automatic welding of the automobile rear door reinforcing plate is provided with a plurality of clamping assemblies (first to fifth clamping assemblies), and each clamping assembly is clamped by a clamping cylinder. A plurality of clamping points can fix the rear door reinforcing plate from different positions, uniformly disperse the stress, avoid the movement of the reinforcing plate in the welding process due to uneven stress or external force, so as to realize accurate and stable clamping, ensure the accuracy of the welding position, and improve the welding quality. The control assembly is connected with the main mounting seat, and is connected with a plurality of clamping cylinders through a pneumatic control valve seat, so as to realize centralized control of the clamping cylinders. This makes the entire clamping process automatic, without manual operation of the clamping device one by one, thereby improving the production efficiency. At the same time, automatic control ensures the consistency of the force and action of each clamping, thereby improving the stability of the welding quality.

[0040] The cylinder triad in the control assembly is connected with the air source, the cylinder triad can filter, regulate pressure and lubricate the compressed air entering the system, so as to ensure that the air entering the cylinder is clean, the pressure is stable and has good lubricity, thereby prolonging the service life of the cylinder and reducing the production stagnation caused by cylinder failure. At the same time, the triad protective cover is fixed outside the cylinder triad, and the control valve protective cover is fixed outside the pneumatic control valve seat, which can prevent dust, sundries and the like from the outside from causing damage, thereby further improving the reliability and stability of the equipment.

[0041] The above only describes the preferred embodiment of the utility model, and does not limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the utility model shall be included in the protection scope of the utility model.

Claims

1. A fixture for automatic welding of a reinforcement plate of an automobile rear door, characterized in that, Including, main mounting seat, clamping assembly, control assembly, the main mounting seat is fixed with several clamping assemblies, including first clamping assembly (9), second clamping assembly (25), third clamping assembly (26), fourth clamping assembly (33), fifth clamping assembly (34), first clamping assembly (9), second clamping assembly (25), third clamping assembly (26), fourth clamping assembly (33), fifth clamping assembly (34), any clamping assembly is clamped by clamping cylinder, the clamping assembly is clamped after door reinforcement plate (10), the control assembly is connected with the main mounting seat, the pneumatic control valve seat (4) in the control assembly is connected with several clamping cylinders, the cylinder three connecting pieces (6) in control assembly are connected with gas source, the cylinder three connecting pieces (6) are externally fixed three connecting pieces protective cover (7), the pneumatic control valve seat (4) is externally fixed control valve protective cover (5).

2. The fixture for automatic welding of reinforcement plate of automobile rear door according to claim 1, characterized in that, In first clamping assembly (9), clamping fixed base (17) is locked on main mounting seat, first connecting plate (18) is locked with clamping fixed base (17), first clamping plate (23) is locked on the upper surface of first connecting plate (18), and is connected with second connecting plate (21) through second connecting shaft, first clamping plate (23) is L-shaped block, first connecting plate (18) is fixed with first clamping cylinder (19) cylinder body through second cylinder connecting piece (24), the piston rod of first clamping cylinder (19) is connected with first cylinder connecting piece (20), first cylinder connecting piece (20) is connected with third connecting plate (22) through first connecting shaft, third connecting plate (22) end is installed first clamping plate (23) in the opposite position of first clamping plate (23), third connecting plate (22) is locked with second connecting plate (21), the bending section of third connecting plate (22) connected with first clamping plate (23) is higher relative to the bending section of locked second connecting plate (21), first clamping assembly (9) is clamped in the center of the shorter reinforcement plate without notch in rear door reinforcement plate (10), first clamping assembly (9) is also clamped in the edge of the longer reinforcement plate provided with long notch in rear door reinforcement plate (10).

3. The fixture for automatic welding of reinforcement plates of automobile rear doors according to claim 2, characterized in that, In the third clamping assembly (26), the clamping fixed base (17) is locked on the main mounting base, the first connecting plate (18) is locked with the clamping fixed base (17), the upper surface of the first connecting plate (18) is locked with the first clamping plate (23), and the first connecting plate (18) is connected with the second connecting plate (21) through the second connecting shaft. The first clamping plate (23) is an L-shaped block, the first connecting plate (18) is fixed with the cylinder body of the third clamping cylinder (27) through the second cylinder connecting piece (24), the piston rod of the third clamping cylinder (27) is connected with the first cylinder connecting piece (20), the first cylinder connecting piece (20) is connected with the third connecting plate (22) through the first connecting shaft, the third connecting plate (22) is installed with the first clamping plate (23) in the position opposite to the first clamping plate (23), the third connecting plate (22) is locked with the second connecting plate (21), the bending section of the third connecting plate (22) connected with the first clamping plate (23) is higher than the bending section of the third connecting plate (22) locked with the second connecting plate (21), the first connecting plate (18) is provided with a rectangular groove at the position locked with the first clamping plate (23), the side surface of the rectangular groove is provided with a plurality of first mounting holes, the first mounting holes are locked with the first connecting seat (32), the first connecting seat (32) is connected with the pin fixing seat (31), the upper part of the pin fixing seat (31) is slidably connected with the fixing pin (29), the first lifting cylinder (30) is fixed on the lower part of the pin fixing seat (31), and the piston rod of the first lifting cylinder (30) is connected with the fixing pin (29). The second clamping assembly (25) and the third clamping assembly (26) are the same structure, wherein the third clamping cylinder (27) is replaced by the second clamping cylinder (28), the second clamping assembly (25) and the third clamping assembly (26) are symmetrically arranged at the two ends of the shorter reinforcing plate without a notch in the rear door reinforcing plate (10), and the fixing pin (29) is fixed in the positioning pin hole of the shorter reinforcing plate.

4. The fixture for automatic welding of reinforcement plates of automobile rear doors according to claim 3, characterized in that, In the fifth clamping assembly (34), the clamping fixed seat (17) is locked on the main mounting seat, the first connecting plate (18) is locked with the clamping fixed seat (17), the upper surface of the first connecting plate (18) is locked with the second clamping plate (37), and the first connecting plate (18) is connected with the second connecting plate (21) through the second connecting shaft. The first connecting plate (18) is fixed with the cylinder body of the fifth clamping cylinder (36) through the second cylinder connecting piece (24), the piston rod of the fifth clamping cylinder (36) is connected with the first cylinder connecting piece (20), the first cylinder connecting piece (20) is connected with the third connecting plate (22) through the first connecting shaft, the end of the third connecting plate (22) is connected with the third clamping plate (38), and the third clamping plate (38) is installed opposite to the second clamping plate (37), the middle part of the third clamping plate (38) is provided with a groove, the second clamping plate (37) is in the shape of a cuboid, the third connecting plate (22) is locked with the second connecting plate (21), the bending section of the third connecting plate (22) connected with the third clamping plate (38) is higher than the bending section of the second connecting plate (21), a plurality of second mounting holes are arranged on the front surface of the first connecting plate (18), the second mounting holes are locked with the second connecting seat (39), the second connecting seat (39) is connected with the pin fixing seat (31), the upper part of the pin fixing seat (31) is slidably connected with the fixing pin (29), the first lifting cylinder (30) is fixed on the lower part of the pin fixing seat (31), and the piston rod of the first lifting cylinder (30) is connected with the fixing pin (29); the fifth clamping assembly (34) is symmetrically arranged at the position where the positioning pin hole is arranged on the longer reinforcing plate with a longer notch in the rear door reinforcing plate (10), and the fixing pin (29) is fixed in the positioning pin hole beside the middle notch of the longer reinforcing plate.

5. The fixture for automatic welding of reinforcement plates of automobile rear doors according to claim 4, characterized in that, In the fourth clamping assembly (33), the clamping fixed seat (17) is locked on the main mounting seat, the first connecting plate (18) is locked with the clamping fixed seat (17), the upper surface of the first connecting plate (18) is locked with the second clamping plate (37), and the first connecting plate (18) is connected with the second connecting plate (21) through the second connecting shaft. The first connecting plate (18) is fixed with the cylinder body of the fourth clamping cylinder (35) through the second cylinder connecting piece (24), the piston rod of the fourth clamping cylinder (35) is connected with the first cylinder connecting piece (20), the first cylinder connecting piece (20) is connected with the third connecting plate (22) through the first connecting shaft, the end of the third connecting plate (22) is connected with the third clamping plate (38), and the third clamping plate (38) is installed opposite to the second clamping plate (37), the middle part of the third clamping plate (38) is provided with a groove, the second clamping plate (37) is in the shape of a cuboid, the third connecting plate (22) is locked with the second connecting plate (21), the bending section of the third connecting plate (22) connected with the third clamping plate (38) is higher than the bending section of the second connecting plate (21), the fourth clamping assembly (33) is symmetrically arranged at the middle mounting position of the longer reinforcing plate with a longer notch in the rear door reinforcing plate (10).

6. The fixture for automatic welding of reinforcement plates of automobile rear doors according to claim 5, characterized in that, In the main mounting seat, the first mounting plate (3) is locked and clamped by the fixed seat (17), the first mounting plate (3) is connected with the second mounting plate (2) through the connecting coaming (14), the inside of the connecting coaming (14) is supported by the transverse and longitudinal connecting I-beam (13), the bottom of the second mounting plate (2) is locked and supported by the supporting base plate (15), the bottom of the supporting base plate (15) is connected with the supporting square steel (11), the supporting square steel is installed and fixed with the square plate, the square plate is connected with the square base plate (1) through the screw rod, the side of the fixed square plate is locked and clamped by the folded plate connecting block (16), the vertical section of the folded plate connecting block (16) is locked and supported by the vertical section of the folded plate (8), and the upper surface of the first mounting plate (3) is symmetrically provided with four lifting lugs (12).

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