Robot workstation welding drive axle middle section assembly Y welding seam clamp

Abstract

The utility model discloses a Y welding seam clamp for welding a drive axle middle section assembly in a robot workstation, belongs to the field of clamps, and aims to improve the qualified rate of welding seams, reduce staff and improve efficiency. Comprising a bottom plate, a main positioning mandrel and a secondary positioning mandrel; a middle limiting mechanism is arranged in the positioning area; an adjusting base of the middle limiting mechanism is mounted on the bottom plate; the bottom ends of the guide columns are fixed to the adjusting base, the top ends of the guide columns are movably inserted into through holes of the positioning rotating plate, and the floating springs are located between the positioning rotating plate and the adjusting base. The pressing plate is positioned above the positioning rotating plate; after a product is installed between the main positioning mandrel and the secondary positioning mandrel, the product is limited by the bottom of the product through the positioning rotating plate and is limited by pressing the top of the product through the pressing plate. The middle limiting mechanism is arranged in the positioning area between the main positioning mandrel and the secondary positioning mandrel, so that the phenomenon of weld joint deviation caused by product movement during robot welding or 360-degree arbitrary rotation of a clamp is prevented, the weld joint quality is improved, and the number of workers is reduced.

Description

Technical Field

[0001] The utility model belongs to the field of fixtures, in particular to a Y-weld seam fixture for welding a middle section assembly of a driving axle in a robot workstation. Background Art

[0002] The middle section assembly of the drive axle of a new off-road vehicle project needs to be welded with multiple welds, including the front left straight weld, the front right straight weld, the front 4 triangle plate welds, the back left straight weld, the back right straight weld and the back 4 triangle plate welds. Figure 1 The top side is attached to the Figure 2 bottom surface.

[0003] Initially, the middle section assembly of the drive axle was welded by a traditional double-gun straight welder and the triangular plate welds were welded manually. The fixture of the double-gun straight welder is integrated with the equipment, and the left and right double guns are used. The left and right double guns are guided by linear guides and can only move left and right. Moreover, the fixture of the double-gun straight welder only has a bottom plate and two end positioning mandrels. When the product is fixed by the fixture, it moves left and right. The operator must 100% align the guns during each welding. In addition, the middle section assembly of the drive axle is designed with a height difference. After the special machine performs straight welding, it is easy to have welding deviation and inconsistent welding gun rod extension, resulting in poor welding appearance quality. There is no tooling for the triangular plate weld, and the welding quality depends entirely on the operator's manual skills. The weld fusion pass rate is only 57%. In the road test of new products and the after-sales market, weld cracking and oil leakage quality incidents occurred, resulting in high quality claims and corporate reputation losses.

[0004] With the rapid development of industry and intelligent manufacturing, the application of robot workstation welding technology has become one of the core technologies of modern enterprise manufacturing. The robot has 6 joints and 6 axis movements, which can realize welding of any product at different angles and lengths. If the fixture of the traditional double-gun straight welding machine is used, the above problems will exist. Therefore, the design of the fixture structure suitable for the robot workstation welding drive axle middle section assembly Y weld should be particularly important. Utility Model Content

[0005] The utility model aims to provide a robot workstation to weld a Y-weld seam fixture for a middle section assembly of a drive axle, so as to realize universal platform welding, improve the weld qualification rate, ensure good welding forming, and reduce staff and increase efficiency.

[0006] The technical solution adopted by the utility model is: a Y-weld seam fixture for welding the middle section assembly of a driving bridge of a robot workstation comprises a bottom plate, and in the transverse direction comprises a main positioning mandrel located at the left end and a secondary positioning mandrel located at the right end, wherein the main positioning mandrel and the secondary positioning mandrel are arranged opposite to each other, and a positioning area is formed by the area between the main positioning mandrel and the secondary positioning mandrel; a main driving cylinder for driving the main positioning mandrel to move left and right along its axial direction, and a secondary driving cylinder for driving the secondary positioning mandrel to move left and right along its axial direction are provided;

[0007] A middle limiting mechanism is arranged in the positioning area; the middle limiting mechanism comprises an adjusting base, a positioning rotating plate, a guide column and a clamping plate; the adjusting base is mounted on the bottom plate; the bottom end of the guide column is fixed to the adjusting base, and the top end is movably inserted into the through hole of the positioning rotating plate, and a floating spring is sleeved on the guide column, and the floating spring is located between the positioning rotating plate and the adjusting base; and a locking mechanism for locking the relative positions of the positioning rotating plate and the adjusting base is arranged between the positioning rotating plate and the adjusting base; the clamping plate is located above the positioning rotating plate, and a clamping driving mechanism for driving the clamping plate to float up and down is arranged;

[0008] When the product is installed between the main positioning spindle and the secondary positioning spindle, the positioning rotating plate limits the position from the bottom of the product, and the clamping plate limits the position on the top of the product.

[0009] Furthermore, a movable base is provided between the bottom plate and the adjustment base;

[0010] A middle section long strip hole extending transversely is provided in the middle section of the bottom plate, and the movable base is fastened to the bottom plate by a bolt assembly passing through the middle section long strip hole and corresponding bolt holes on the movable base.

[0011] Furthermore, four safety columns are fixed on the mobile base, the tops of the safety columns are bent outwards, and a lifting area is surrounded by the bent parts of the four safety columns.

[0012] Furthermore, the main positioning mandrel includes a positioning section and a limiting section along its axial direction, and a limiting step extending outward from the positioning section is formed between the limiting section and the positioning section;

[0013] A main positioning bracket is fixed at the left end of the bottom plate; the main positioning bracket is provided with a channel which penetrates along the axial direction and is adapted to the positioning section of the main positioning mandrel; the positioning section is movably assembled in the channel along the axial direction, and a limiting step cooperates with the side wall of the main positioning bracket to form an axial limit for the main positioning mandrel;

[0014] The piston sleeve of the secondary driving cylinder is supported on a movable seat, and the movable seat is movably mounted on the bottom plate along the axial direction;

[0015] A robot welding gun is installed on the bottom plate; the arc starting point of the robot welding gun is aligned with the positioning surface; the positioning surface is the end surface of the positioning section opposite to the product when the main positioning mandrel is in a positioning state.

[0016] Furthermore, an end strip hole extending laterally thereof is opened at the end of the bottom plate, and the movable seat is fastened to the bottom plate by a bolt assembly passing through the end strip hole and the corresponding bolt hole on the movable seat.

[0017] Furthermore, the main positioning bracket includes a longitudinally arranged positioning plate, the channel is arranged on the positioning plate, and transversely arranged reinforcing plates are respectively arranged on the front and rear sides of the positioning plate.

[0018] Furthermore, the positioning end of the secondary positioning mandrel is a conical head.

[0019] Furthermore, a weld clearance groove is provided at the top of the secondary positioning mandrel and penetrates along its axial direction; and a limited rotation pin is provided between the secondary positioning mandrel and the piston of the secondary driving cylinder.

[0020] Further, the clamping plate includes a front clamping plate, a rear clamping plate, a middle connecting strip and an upper connecting strip; the front end of the front clamping plate is provided with a front clamping portion protruding downward; the rear end of the rear clamping plate is provided with a rear clamping portion protruding downward; the front clamping plate and the rear clamping plate are arranged at a front-to-back spacing; the middle connecting strip straddles between the front clamping plate and the rear clamping plate, the front section of the middle connecting strip is bolted to the front clamping plate, and the rear section of the middle connecting strip is bolted to the rear clamping plate;

[0021] A connecting block is provided between the middle connecting strip and the upper connecting strip; the connecting block is provided with a first groove which opens downward and passes through in the front and rear direction in the middle part along the horizontal direction; the front end part of the upper connecting strip is provided with a second groove which opens downward and passes through in the horizontal direction; the connecting block is fitted in the middle part of the middle connecting strip from top to bottom, and the connecting block and the middle connecting strip are connected by bolts; the top end of the connecting block is inserted into the second groove of the upper connecting strip, and the connecting block and the upper connecting strip are connected by bolts;

[0022] A driving block is arranged between the upper connecting bar and the rear pressure plate; the driving block includes a connecting rod and a crankshaft located at both ends of the connecting rod, the connecting rod is horizontally installed between the upper connecting bar and the rear pressure plate, the outer end of the crankshaft is fixed to the connecting rod, and the inner end is installed on the frame through a square pin shaft, and the clamping drive mechanism is a clamping cylinder, which is connected to the square pin shaft through a transmission structure to drive the square pin shaft to rotate back and forth.

[0023] Furthermore, robot interface boards are installed at the left and right ends of the bottom plate respectively.

[0024] The beneficial effects of the utility model are as follows: the utility model sets a middle limit mechanism in the positioning area between the main positioning mandrel and the secondary positioning mandrel, and the clamping plate of the middle limit mechanism presses on the product from above, and the positioning rotating plate holds up the product from below, which is equivalent to clamping the product in the upper and lower directions by the clamping plate and the positioning rotating plate, preventing the weld deviation caused by product movement during robot welding or when the fixture rotates 360° arbitrarily, improving the weld quality, and increasing the weld penetration from 57% to 97%-100%, reducing the number of personnel by 4, increasing production efficiency by 30%, reducing the cost of a single set by 1.76 yuan / piece, and reducing the manufacturing cost by about 590,000 yuan per year. At present, 5 robot workstations have been switched in batches, and 10 pairs of Y welding fixtures have been invested.

[0025] The utility model discloses a Y-weld seam fixture for welding the middle section assembly of a driving axle at a robot workstation, which is provided with a robot interface plate. The robot connection base plate is a robot interface, so as to realize the assembly of the fixture and the robot. Through the cooperation between the fixture and the robot workstation, after the product is clamped to the fixture, both the straight weld and the triangular plate weld can be realized.

[0026] By setting the main positioning bracket, the working position of the main positioning mandrel is determined, thereby determining the product positioning reference and the robot welding origin reference.

[0027] By changing the diameter of the main positioning mandrel and the lateral movement stroke of the secondary positioning mandrel, more than 100 types of drive axle mid-section assemblies can be quickly switched, eliminating the traditional robot fixture dedicated line and dedicated production mode. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the structure of the utility model;

[0029] Figure 2 This is a schematic diagram of the product structure after installation of the utility model;

[0030] Figure 3 It is a schematic diagram of the structure of the middle positioning mechanism;

[0031] Figure 4 It is a schematic diagram of the connection block structure;

[0032] Figure 5 Schematic diagram of the upper connecting strip structure;

[0033] Figure 6 It is a schematic diagram of positioning the rotating plate adjustment;

[0034] Figure 7 This is a schematic diagram of the main positioning mandrel structure;

[0035] Figure 8 for Figure 1 Top view with the main positioning spindle protective cover removed.

[0036] In the figure, bottom plate 1, end strip hole 1010, middle strip hole 1020, main driving cylinder 2, main positioning mandrel 3, positioning section 301, limiting section 302, limiting step 303, positioning surface 304, main positioning bracket 4, positioning plate 401, reinforcing plate 402, channel 403, secondary driving cylinder 5, secondary positioning mandrel 6, weld seam clearance groove 601, rotation limiting pin 602, adjustment base 7, positioning rotation plate 8, guide column 9, pressure Tightening plate 10, front pressure plate 101, rear pressure plate 102, middle connecting strip 103, connecting block 104, groove 105, upper connecting strip 106, groove 2 107, connecting rod 108, crankshaft 109, square pin 110, floating spring 11, locking mechanism 12, movable base 13, safety column 14, clamping drive mechanism 15, frame 16, product 17, movable seat 18, robot welding gun 19, robot interface board 20. DETAILED DESCRIPTION

[0037] The present invention is further described below in conjunction with the accompanying drawings and embodiments:

[0038] In the present invention, the terms "longitudinal", "lateral", "vertical", "up", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom" and the like indicate directions or positional relationships based on the attached Figure 1 The orientation or position relationship shown. Among them, the longitudinal direction refers to the front-to-back direction, and also refers to the width direction of the base plate; the transverse direction refers to the left-right direction, and also refers to the length direction of the base plate, and is also the axial direction of the positioning core shaft; the vertical direction refers to the up-down direction, and also refers to the thickness direction of the base plate. These directions or position relationships are used only to facilitate the description of the utility model, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as a limitation to the utility model.

[0039] The traditional double-gun straight seam special machine fixture is only fixed by the bottom plate and the positioning mandrels at both ends, that is, it includes a bottom plate 1, and includes a main positioning mandrel 3 located at the left end and a secondary positioning mandrel 6 located at the right end in the horizontal direction. The main positioning mandrel 3 and the secondary positioning mandrel 6 are arranged opposite to each other, and the area between the main positioning mandrel 3 and the secondary positioning mandrel 6 constitutes a positioning area; a main driving cylinder 2 is provided to drive the main positioning mandrel 3 to move left and right along its axial direction, and a secondary driving cylinder 5 is provided to drive the secondary positioning mandrel 6 to move left and right along its axial direction. Since the product 17 is positioned only at both ends and there is no limited rotation mechanism, there is a large movement in the left and right direction, a large deviation in the circumferential rotation direction, and the middle section assembly of the drive axle is designed with a height difference. After the special machine performs straight-line welding, it is easy to have a biased weld and inconsistent extension of the welding gun rod, resulting in poor welding appearance quality and insufficient penetration.

[0040] The utility model discloses a robot workstation welding drive axle middle section assembly Y welding fixture, such as Figure 1 , Figure 2 and Figure 8 As shown, it includes a base plate 1, and in the horizontal direction includes a main positioning spindle 3 located at the left end and a secondary positioning spindle 6 located at the right end. The main positioning spindle 3 and the secondary positioning spindle 6 are arranged opposite to each other, and the area between the main positioning spindle 3 and the secondary positioning spindle 6 constitutes a positioning area; a main driving cylinder 2 is provided for driving the main positioning spindle 3 to move left and right along its axial direction, and a secondary driving cylinder 5 is provided for driving the secondary positioning spindle 6 to move left and right along its axial direction; a middle limiting mechanism is provided in the positioning area.

[0041] like Figure 3 and Figure 6 As shown, the middle limit mechanism includes an adjustment base 7, a positioning rotating plate 8, a guide column 9 and a pressing plate 10; the adjustment base 7 is installed on the bottom plate 1; the bottom end of the guide column 9 is fixed to the adjustment base 7, and the top end is movably inserted into the through hole of the positioning rotating plate 8, and a floating spring 11 is mounted on the guide column 9, and the floating spring 11 is axially extended and retracted along the guide column 9, and the retracting path of the floating spring 11 is limited by the guide column 9 to prevent the floating spring 11 from running off. The floating spring 11 is located between the positioning rotating plate 8 and the adjustment base 7. A locking mechanism 12 for locking the relative position of the positioning rotating plate 8 and the adjustment base 7 is provided between the positioning rotating plate 8 and the adjustment base 7. The locking mechanism 12 can be a structure of a screw rod and a nut, that is, the bottom end of the screw rod is fixed to the adjustment base 7, and the top end passes through the corresponding bolt hole on the positioning rotating plate 8 vertically upward, and at least one nut is threadedly connected on the screw rod and on the upper and lower sides of the positioning rotating plate 8, respectively, and the nuts on the upper and lower sides of the positioning rotating plate 8 relatively clamp the positioning rotating plate 8, thereby locking the position of the positioning rotating plate 8. The specific working process is as follows: after the left and right ends of the product 17 are positioned by the main positioning spindle 3 and the secondary positioning spindle 6, when the locking mechanism 12 is released, the positioning rotating plate 8 moves up and down through the guide column 9 and the floating spring 11 to ensure that the positioning rotating plate 8 is in contact with the product; then, the locking mechanism 12 is tightened, and the bottom of the product 17 is limited by the positioning rotating plate 8; then, the clamping plate 10 is located above the positioning rotating plate 8, and under the action of the clamping drive mechanism 15, the clamping plate 10 is driven to float up and down, and the clamping plate 10 is pressed on the top of the product 17 for limiting.

[0042] The clamping plate 10 presses on the product 17 from above, and the positioning rotating plate 8 holds up the product 17 from below, which is equivalent to clamping the product 17 in the upper and lower directions through the clamping plate 10 and the positioning rotating plate 8, thereby preventing the weld from deviating due to product movement during robot welding or when the fixture rotates 360° at will, thereby improving the weld quality.

[0043] In order to adjust the position of the middle limit mechanism to adapt to products 17 of different specifications, preferably, a movable base 13 is provided between the bottom plate 1 and the adjustment base 7; a middle section long hole 1020 extending laterally along the bottom plate 1 is provided in the middle section, and the movable base 13 is fastened to the bottom plate 1 by passing a bolt assembly through the middle section long hole 1020 and the corresponding bolt holes on the movable base 13. In this structure, the movable base 13 moves laterally on the bottom plate 1, and the position of the middle limit mechanism on the bottom plate 13 is adjusted left and right.

[0044] In order to improve safety, preferably, four safety columns 14 are fixed on the mobile base 13 , the tops of the safety columns 14 are bent outward, and the bent portions of the four safety columns 14 form a lifting area.

[0045] Since the workers will stand under the product 17 to work during the operations of fixing the positioning rotating plate 8, there is a risk that the product 17 will fall and injure people or property when the product 17 is loaded or unloaded. The four safety columns 14 are installed in the profile support area below the product 17. Once the product 17 falls, the bent parts of the four safety columns 14 will hold up the product 17 to prevent the product 17 from falling and injuring the workers or other mechanical equipment, tools, etc.

[0046] In a conventional special machine fixture, the displacement of the main positioning mandrel 3 and the secondary positioning mandrel 6 is determined by the extension of the piston of the hydraulic cylinder, resulting in large movement of the product 17. This is not enough to ensure that the position of each product 17 is fixed after clamping, so that the operator needs to align the gun completely during each welding. In order to overcome the above problems, the main positioning spindle 3 includes a positioning section 301 and a limiting section 302 along its axial direction, and a limiting step 303 extending outward from the positioning section 301 is formed between the limiting section 302 and the positioning section 301; a main positioning bracket 4 is fixed at the left end of the base plate 1, and the main positioning bracket 4 is provided with a channel 403 which penetrates along the axial direction and is adapted to the positioning section 301 of the main positioning spindle 3, the positioning section 301 is axially movably assembled in the channel 403, and the limiting step 303 cooperates with the side wall of the main positioning bracket 4 to form an axial limit for the main positioning spindle 3; the piston sleeve of the secondary driving cylinder 5 is supported on the movable seat 18, and the movable seat 18 is axially movably installed on the base plate 1. During operation, first, the main positioning mandrel 3 is pushed to the limit position by extending the piston rod of the main driving cylinder 2. The limit position refers to the position of the main positioning mandrel 3 when the limiting step 303 contacts the side wall of the main positioning bracket 4. At this time, due to the mutual cooperation between the limiting step 303 and the main positioning bracket 4, the main positioning mandrel 3 cannot move further to the right, and the product positioning reference and the robot welding origin reference are determined. Then, the left end of the product 17 is positioned by the main positioning mandrel 3, and the piston rod of the secondary driving cylinder 5 is extended to push the secondary positioning mandrel 6 to limit the right end of the product 17. In this way, it can be ensured that after each product 17 is positioned by the main positioning mandrel 3 and the secondary positioning mandrel 6, the position of the main positioning mandrel 3 remains unchanged, that is, the installation position of the left end of the product 17 remains unchanged, which is more conducive to determining the positioning coordinate system of the arc starting point and ensuring that the positioning coordinates used for each arc starting point are consistent. For example, a robot welding gun 19 is installed on the bottom plate 1; the arc starting point of the robot welding gun 19 is aligned with the positioning surface; Figure 7 As shown, the positioning surface 304 is the end surface of the positioning section 301 opposite to the product when the main positioning mandrel 3 is in the positioning state. At the same time, since the main positioning bracket 4 limits the main positioning mandrel 3, it prevents the main positioning mandrel from shaking during welding, thereby ensuring sufficient welding strength and rigidity.

[0047] The main positioning bracket 4 includes a longitudinally arranged positioning plate 401 , the channel 403 is arranged on the positioning plate 401 , and transversely arranged reinforcing plates 402 are respectively arranged on the front and rear sides of the positioning plate 401 . The reinforcing plates 402 play a reinforcing role on the positioning plate 401 .

[0048] In order to adapt to products of different specifications, preferably, an end strip hole 1010 extending in the transverse direction is opened at the end of the bottom plate 1, and the moving seat 18 is fastened to the bottom plate 1 by passing a bolt assembly through the end strip hole 1010 and the corresponding bolt hole on the moving seat 18. After loosening the bolt assembly, the position of the moving seat 18 can be adjusted along the end strip hole 1010, thereby adjusting the position of the secondary positioning mandrel 6, so as to achieve the purpose of adjusting the length of the positioning area to adapt to products of different lengths.

[0049] Preferably, the positioning end of the secondary positioning mandrel 6 is a conical head. Through the setting of the conical head, the positioning end can adapt to a variety of products with different cross-sections and can meet the positioning of more than 100 products.

[0050] To prevent welding on the fixture, a weld clearance groove 601 is provided on the top of the secondary positioning mandrel 6 and runs through the axial direction thereof. In order to limit the secondary positioning mandrel 6 and prevent the positioning mandrel 6 from rotating, a limited rotation pin 602 is provided between the secondary positioning mandrel 6 and the piston of the secondary driving cylinder 5.

[0051] Preferably, Figure 3 , Figure 4 and Figure 5 As shown, the clamping plate 10 includes a front clamping plate 101, a rear clamping plate 102, a middle connecting strip 103 and an upper connecting strip 106; the front clamping plate 101 and the rear clamping plate 102 can adopt an integral structure. Since the middle part of the product is a hollow annular structure, and since the middle part is hollowed out, in order to better press the annular part and avoid material waste. The front clamping plate 101 and the rear clamping plate 102 adopt a split structure, and the front and rear clamping plates 101 and 102 are arranged at a front and rear spacing. The front end of the front clamping plate 101 is provided with a front clamping portion protruding downward; the rear end of the rear clamping plate 102 is provided with a rear clamping portion protruding downward. The middle connecting strip 103 straddles the front pressure plate 101 and the rear pressure plate 102, the front section of the middle connecting strip 103 is bolted to the front pressure plate 101, and the rear section of the middle connecting strip 103 is bolted to the rear pressure plate 102. When worn, it can be replaced as needed without replacing the front pressure plate 101 and the rear pressure plate 102 at the same time.

[0052] A connecting block 104 is provided between the middle connecting strip 103 and the upper connecting strip 106; the connecting block 104 is provided with a groove 105 which is open downward and passes through in the front and back direction in the middle of the horizontal direction; the front end of the upper connecting strip 106 is provided with a groove 107 which is open downward and passes through in the horizontal direction; the connecting block 104 is fitted in the middle of the middle connecting strip 103 from top to bottom, and the connecting block 104 and the middle connecting strip 103 are connected by bolts; the top end of the connecting block 104 is inserted into the groove 107 of the upper connecting strip 106, and the connecting block 104 and the middle connecting strip 103 are connected by bolts. The upper connecting bars 106 are connected by bolts; a driving block is arranged between the upper connecting bar 106 and the rear pressure plate 102; the driving block includes a connecting rod 108 and a crankshaft 109 located at both ends of the connecting rod 108, the connecting rod 108 is horizontally installed between the upper connecting bar 106 and the rear pressure plate 102, the outer end of the crankshaft 109 is fixed to the connecting rod 108, and the inner end is installed on the frame 16 through a square pin 110, the clamping drive mechanism 15 is a clamping cylinder, the clamping cylinder is connected to the square pin 110 through a transmission structure, and drives the square pin 110 to rotate back and forth.

[0053] In order to facilitate connection with the welding robot, preferably, robot interface plates 20 are respectively installed on the left and right ends of the base plate 1.

[0054] Among them, the product in this embodiment is the middle section of the drive axle. Figure 8 The red line shows the Y weld in the middle section of the drive axle.

[0055] The middle section assembly of the drive axle of a new off-road vehicle project has been changed from the traditional double-gun straight welding machine straight welding and manual welding of the triangle plate welds to the robot workstation welding drive axle middle section assembly Y welding fixture disclosed in the utility model in cooperation with the robot workstation. After welding by the robot workstation, the weld penetration is increased from 57% to 97%-100%, the number of personnel is reduced by 4, the production efficiency is increased by 30%, the cost of a single set is reduced by 1.76 yuan / piece, and the annual manufacturing cost is reduced by about 590,000 yuan. At present, 5 robot workstations have been switched in batches, 10 pairs of Y welding fixtures have been invested, and all integral platform products are capable of production.

Claims

1. A robot workstation welding drive axle middle section assembly Y welding seam fixture, comprising a base plate (1), a main positioning mandrel (3) located at the left end and a secondary positioning mandrel (6) located at the right end in the transverse direction, wherein the main positioning mandrel (3) and the secondary positioning mandrel (6) are arranged opposite to each other, and the area between the main positioning mandrel (3) and the secondary positioning mandrel (6) constitutes a positioning area; a main driving cylinder (2) for driving the main positioning mandrel (3) to move left and right along its axial direction, and a secondary driving cylinder (5) for driving the secondary positioning mandrel (6) to move left and right along its axial direction are provided; the characteristics are: A middle limiting mechanism is arranged in the positioning area; the middle limiting mechanism comprises an adjusting base (7), a positioning rotating plate (8), a guide column (9) and a clamping plate (10); the adjusting base (7) is mounted on the bottom plate (1); the bottom end of the guide column (9) is fixed to the adjusting base (7), and the top end is movably inserted into the through hole of the positioning rotating plate (8), and a floating spring (11) is mounted on the guide column (9), and the floating spring (11) is located between the positioning rotating plate (8) and the adjusting base (7); and a locking mechanism (12) for locking the relative position of the positioning rotating plate (8) and the adjusting base (7) is arranged between the positioning rotating plate (8) and the adjusting base (7); the clamping plate (10) is located above the positioning rotating plate (8), and a clamping driving mechanism (15) for driving the clamping plate (10) to float up and down is arranged; When the product (17) is installed between the main positioning spindle (3) and the secondary positioning spindle (6), the positioning rotating plate (8) limits the position of the bottom of the product (17), and the pressing plate (10) presses on the top of the product (17) to limit the position.

2. The Y-weld seam fixture for welding the middle section assembly of a drive axle in a robot workstation as claimed in claim 1, characterized in that: A movable base (13) is provided between the base plate (1) and the adjustment base (7); A middle section long hole (1020) extending laterally is provided in the middle section of the bottom plate (1), and a bolt assembly passes through the middle section long hole (1020) and corresponding bolt holes on the movable base (13) to tighten the movable base (13) to the bottom plate (1).

3. The Y-weld seam fixture for welding the middle section assembly of a drive axle at a robot workstation as claimed in claim 2, characterized in that: Four safety columns (14) are fixed on the mobile base (13), the tops of the safety columns (14) are bent outwards, and a lifting area is surrounded by the bent parts of the four safety columns (14).

4. The Y-weld fixture for welding the middle section assembly of the drive axle of the robot workstation according to any one of claims 1 to 3, characterized in that: The main positioning mandrel (3) comprises a positioning section (301) and a limiting section (302) along its axial direction, and a limiting step (303) extending outward from the positioning section (301) is formed between the limiting section (302) and the positioning section (301); A main positioning bracket (4) is fixed at the left end of the base plate (1); the main positioning bracket (4) is provided with a channel (403) which penetrates along the axial direction and is adapted to the positioning section (301) of the main positioning mandrel (3); the positioning section (301) is movably assembled in the channel (403) along the axial direction, and a limiting step (303) cooperates with the side wall of the main positioning bracket (4) to form an axial limit for the main positioning mandrel (3); The piston sleeve of the secondary driving cylinder (5) is supported on a movable seat (18), and the movable seat (18) is movably mounted on the bottom plate (1) along the axial direction; A robot welding gun (19) is mounted on the bottom plate (1); the arc starting point of the robot welding gun (19) is aligned with the positioning surface; the positioning surface (304) is the end surface of the positioning section (301) opposite to the product when the main positioning core shaft (3) is in a positioning state.

5. The Y-weld seam fixture for welding the middle section assembly of a drive axle at a robot workstation as claimed in claim 4, characterized in that: An end strip hole (1010) extending laterally is provided at the end of the bottom plate (1), and a bolt assembly passes through the end strip hole (1010) and corresponding bolt holes on the movable seat (18) to tighten the movable seat (18) to the bottom plate (1).

6. The Y-weld seam fixture for welding the middle section assembly of a drive axle at a robot workstation as claimed in claim 4, characterized in that: The main positioning bracket (4) comprises a longitudinally arranged positioning plate (401), the channel (403) is arranged on the positioning plate (401), and transversely arranged reinforcing plates (402) are respectively arranged on the front and rear sides of the positioning plate (401).

7. The Y-weld seam fixture for welding the middle section assembly of a drive axle at a robot workstation as claimed in claim 1, characterized in that: The positioning end of the secondary positioning mandrel (6) is a conical head.

8. The Y-weld seam fixture for welding the middle section assembly of a drive axle at a robot workstation as claimed in claim 1, characterized in that: The top of the secondary positioning mandrel (6) is provided with a weld clearance groove (601) penetrating along its axial direction; and a limited rotation pin (602) is provided between the secondary positioning mandrel (6) and the piston of the secondary driving cylinder (5).

9. The Y-weld fixture for welding the middle section assembly of a driving axle of a robot workstation according to any one of claims 1 to 3, characterized in that: The clamping plate (10) comprises a front clamping plate (101), a rear clamping plate (102), a middle connecting strip (103) and an upper connecting strip (106); the front end of the front clamping plate (101) is provided with a front clamping portion protruding downward; the rear end of the rear clamping plate (102) is provided with a rear clamping portion protruding downward; the front clamping plate (101) and the rear clamping plate (102) are arranged with a front-to-back spacing; the middle connecting strip (103) straddles between the front clamping plate (101) and the rear clamping plate (102), the front section of the middle connecting strip (103) is bolted to the front clamping plate (101), and the rear section of the middle connecting strip (103) is bolted to the rear clamping plate (102); A connection block (104) is provided between the middle connection bar (103) and the upper connection bar (106); the connection block (104) is provided with a first groove (105) which is open downward and passes through in the front and rear direction in the middle of the horizontal direction; the front end of the upper connection bar (106) is provided with a second groove (107) which is open downward and passes through in the horizontal direction; the connection block (104) is fitted into the middle of the middle connection bar (103) from top to bottom, and the connection block (104) and the middle connection bar (103) are connected by bolts; the top end of the connection block (104) is inserted into the second groove (107) of the upper connection bar (106), and the connection block (104) and the upper connection bar (106) are connected by bolts; A driving block is arranged between the upper connecting bar (106) and the rear pressure plate (102); the driving block comprises a connecting rod (108) and a crankshaft (109) located at both ends of the connecting rod (108); the connecting rod (108) is transversely installed between the upper connecting bar (106) and the rear pressure plate (102); the outer end of the crankshaft (109) is fixed to the connecting rod (108), and the inner end is installed on the frame (16) through a square pin shaft (110); the clamping drive mechanism (15) is a clamping cylinder, which is connected to the square pin shaft (110) through a transmission structure to drive the square pin shaft (110) to rotate back and forth.

10. The Y-weld seam fixture for welding the middle section assembly of a driving axle of a robot workstation according to any one of claims 1 to 3, characterized in that: Robot interface plates (20) are respectively installed on the left and right ends of the bottom plate (1).

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