A welding fixture for machining

Abstract

The present invention discloses a welding fixture for mechanical processing, which belongs to the field of metal workpiece welding processing, and comprises two symmetrically arranged brackets, one side of the two brackets is rotatably connected to two turntables, and one side of the two turntables is fixedly connected to two support plates, one side of the two support plates is respectively connected to two clamping parts; the clamping parts comprise a base plate connected to one side of the support plate and a slide seat slidably connected to one side of the base plate; the two clamping parts can clamp and position the two workpieces respectively, and since the two clamping parts are not connected, the right-angled angle of the two workpieces will not be blocked, and the welder can realize fast welding at the angle, and then rotate the workpiece to weld different positions of the right-angle connection, and the welder can complete the entire welding process more easily and efficiently at one time, thereby reducing the complexity of the welding operation and saving the welding time.

Description

Technical Field

[0001] The invention relates to the field of metal workpiece welding processing, and more specifically, to a welding fixture for mechanical processing. Background Art

[0002] A welding fixture is a process equipment that can accurately position and reliably clamp metal workpieces, thereby facilitating assembly and welding and ensuring the structural accuracy of weldments. It is a commonly used equipment in mechanical processing.

[0003] The right-angle welding fixture is one of them, which is mainly used to ensure that the workpiece maintains the correct angle and position during welding, especially the welding of 90-degree right angles. The existing right-angle welding fixtures all adopt an integrated design, by designing two mutually perpendicular clamps and a triangular clamp seat on a plate body to achieve the clamping and positioning of the metal workpiece. For example, the prior art (the Chinese invention patent with the announcement number CN113500343B and the Chinese invention application patent with the publication number CN108080855A) discloses a clampable boom plate welding right-angle fixture and a rotary right-angle welding fixture, both of which adopt this structural design;

[0004] Although sufficient clamping force is provided by the large clamping surface in contact with the workpiece, the triangular clamp seat will block the inner angle of the right-angle joint of the workpiece. This obstruction requires that the right-angle joint be welded on the outside first, and then the workpiece is removed from the fixture and the inner angle of the right-angle joint is welded. This separate welding method will result in the inability to complete the welding of the entire right-angle connection at one time, increasing the complexity and time of the operation. Summary of the invention

[0005] In view of the problems existing in the prior art, the object of the present invention is to provide a welding fixture for mechanical processing.

[0006] To solve the above problems, the present invention adopts the following technical solutions.

[0007] A welding fixture for machining, comprising two symmetrically arranged brackets, one side of the two brackets is rotatably connected to two turntables, one side of the two turntables is fixedly connected to two support plates, and one side of the two support plates is connected to two clamping parts;

[0008] The clamping part includes a base plate connected to one side of the support plate, a slide seat slidably connected to one side of the base plate, a screw rod rotatably connected to the inner side wall of the base plate and screwed inside the slide seat, and a handle rotatably connected to the outer surface of one side of the base plate, and the handle passes through the base plate and is fixedly connected to one end of the screw rod;

[0009] The two rotating disks are connected through a synchronous transmission unit, and the synchronous transmission unit includes a synchronous transmission shaft whose two ends are rotatably connected to the two brackets, two synchronous wheels 1 that are rotatably connected to one side of the two brackets, two synchronous wheels 2 that are rotatably connected to one side of the two brackets, and two synchronous belts that respectively connect the two synchronous wheels 1 with the two synchronous wheels 2. The two synchronous wheels 2 are respectively fixedly connected to the two ends of the synchronous transmission shaft, and the two brackets are rotatably connected with connecting columns inside, and the two ends of the connecting columns are respectively fixedly connected to the rotating disk and the adjacent synchronous wheel 1.

[0010] Furthermore, the two brackets are each connected to a positioning portion, and the positioning portion includes a plurality of positioning flanges integrally formed on the outer surface of the connecting column and evenly distributed in an array on the outer surface of the connecting column, a positioning seat slidably connected to the inside of the bracket, a limiting flange integrally formed on one side of the positioning seat and used to be inserted between the plurality of positioning flanges, and a screw rod 2 screwed to the inside of the bracket, and one end of the screw rod 2 is rotatably connected to the other side of the limiting flange.

[0011] Furthermore, the other end of the second screw rod passes through the upper end of the bracket and extends outward.

[0012] Furthermore, an extension support unit is connected to the inside of the substrate, and the extension support unit includes a slide 2 slidably inserted in the inside of the slide 1, a screw rod 2 screwed inside one end of the slide 2, a slide 3 slidably inserted in the inside of the substrate, a screw rod 3 screwed inside one end of the slide 3, two triangular side support blocks respectively fixed to the other ends of the slide 2 and the slide 3, a back support seat fixed to the other end of the slide 3, and one end of the screw rod 2 is rotatably connected to one side of the slide 1, and the other end of the screw rod 2 is rotatably connected to the inside of an extension end on one side of the slide 1, one end of the screw rod 3 is rotatably connected to one side of the substrate, and the other end of the screw rod 3 is rotatably connected to the inside of an extension end on one side of the substrate.

[0013] Furthermore, one side of the two triangular side support blocks is connected to a forward pressure positioning assembly, and the forward pressure positioning assembly includes two guide grooves and a screw groove opened inside the triangular side support block, a screw rod threaded in the screw groove, two guide rods movably inserted in the two guide grooves, a movable seat rotatably connected to one end of the screw rod, a positioning pin fixed to one side of the movable seat, a pressure block rotatably sleeved on the outside of the positioning pin, a positioning bolt threaded inside the pressure block and the movable seat, and one end of the two guide rods is fixed to one side of the movable seat.

[0014] Furthermore, a connecting threaded hole is provided inside the back support seat.

[0015] Furthermore, a slide groove 1 is provided on the outside of the two support plates, and an anti-flexing support unit is connected to the outside of the two support plates, and the anti-flexing support unit includes a slide seat 4 slidably connected in the slide groove 1, an extension seat fixedly connected to the lower end of the slide seat 4, a slide groove 2 provided in the extension seat, a screw rod 4 rotatably connected to the inside of the slide groove 2, a moving seat slidably connected in the slide groove 2 and screwed to the outside of the screw rod 4, two extension parts fixedly connected to one side of the moving seat, a moving clamping seat slidably connected to one side of the moving seat and located between the two extension parts, a screw rod 5 screwed in one of the extension parts, and one end of the screw rod 5 is rotatably connected to one side of the moving clamping seat, and one end of the screw rod 4 passes through the lower end of the extension seat and extends outward.

[0016] Furthermore, two front pressure limit assemblies are respectively connected to one side of the slide seat 1 and one side of the base plate, one side of the movable clamping seat and one side of one of the extension parts, and the front pressure limit assemblies include two pads, fixing bolts screwed in the two pads for fixing the pads on adjacent workpieces, two groups of side plates fixed to one side of the two pads, a pressure plate rotatably connected between one group of side plates, and an insert block clamped in the other group of side plates and used to limit the pressure plate. The four pads are respectively screwed to one side of the slide seat 1, the base plate, the movable clamping seat and one of the extension parts by fixing bolts.

[0017] Furthermore, the two support plates are internally connected with a welding point alignment adjustment part, and the welding point alignment adjustment part includes two movable grooves respectively opened in the two support plates and parallel to each other, two screw rods six respectively rotatably connected in the two movable grooves and parallel to each other, and two slide seats five respectively slidably connected in the two movable grooves and respectively screwed on the outside of the two screw rods six, and one side of the two slide seats five is respectively fixed to one side of the two substrates.

[0018] Furthermore, one end of the two screw rods 6 respectively passes through the upper ends of the two support plates and extends outwards.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] (1) This solution is provided with two symmetrical and non-connected clamping parts, which are respectively fixed on two turntables. The two turntables are connected by a synchronous transmission unit to realize synchronous rotation. The two clamping parts can clamp and position the two workpieces respectively. Since the two clamping parts are not connected, the right-angled corners of the two workpieces will not be blocked. The welder can quickly weld the angle, and then rotate the workpiece to weld different positions of the right-angle connection, avoiding the situation of multiple welding caused by the inability to weld the inner angle during welding. The welder can complete the entire welding process more easily and efficiently at one time, reducing the complexity of the welding operation and saving welding time.

[0021] (2) The present scheme is provided with an extended support unit, which can clamp and position the two sides of the workpiece through two triangular side support blocks, and can clamp and position the other two sides of the workpiece through a back support seat and a front pressure positioning assembly. Since the triangular side support blocks, the back support seat and the front pressure positioning assembly extend to the vicinity of the right-angle welding area of ​​the workpiece, when expansion or stress concentration caused by heat input during the welding process may cause the right-angle area to shift, the extended support unit can disperse these stresses and resist thermal deformation through a clamping effect, thereby keeping the shape and position of the workpiece stable.

[0022] (3) This solution is equipped with an anti-flexure support unit, which can clamp and position the other end or the middle of the workpiece to avoid the situation where the middle part of the long metal workpiece is easily deflected (bending) under the action of its own weight or external force. The anti-flexure support unit can provide additional support to prevent the workpiece from bending due to gravity or welding stress when building a right angle, thereby improving the overall straightness of the metal workpiece and ensuring that the workpiece meets the design size and shape requirements after welding. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0024] Figure 2 It is a schematic diagram of the structure of the clamping portion and the extension support unit of the present invention;

[0025] Figure 3 It is a schematic diagram of the connecting threaded hole structure of the present invention;

[0026] Figure 4 It is a schematic diagram of the structure of the forward pressure positioning assembly of the present invention;

[0027] Figure 5 For the present invention Figure 1 A schematic diagram of the structure enlargement in the middle;

[0028] Figure 6 It is a structural schematic diagram of the welding point alignment adjustment part of the present invention;

[0029] Figure 7 It is a schematic diagram of the positioning part structure of the present invention.

[0030] Description of the numbers in the figure:

[0031] 1. Bracket; 2. Turntable; 3. Support plate; 4. Clamping part; 41. Base plate; 42. Screw rod 1; 43. Slide seat 1; 44. Handle; 5. Extension support unit; 51. Slide seat 2; 52. Screw rod 2; 53. Slide seat 3; 54. Screw rod 3; 55. Back support seat; 551. Connecting threaded hole; 56. Triangular side support block; 57. Front pressure positioning assembly; 571. Guide groove; 572. Screw groove; 573. Screw rod 1; 574. Guide rod; 575. Movable seat; 576. Press block; 577. Positioning pin; 578. Positioning bolt; 6. Anti-bending support unit; 61. Slide groove 1; 62. Slide seat four; 63. extension seat; 64. slide groove two; 65. screw rod four; 66. movable seat; 67. extension part; 68. screw rod five; 69. movable clamping seat; 7. front pressure limit assembly; 71. pad; 72. fixing bolt; 73. pressure plate; 74. side plate; 75. plug-in block; 8. welding point alignment adjustment part; 81. movable groove; 82. screw rod six; 83. slide seat five; 9. synchronous transmission unit; 91. synchronous wheel one; 92. synchronous wheel two; 93. synchronous belt; 94. synchronous transmission shaft; 95. positioning part; 951. positioning flange; 952. positioning seat; 953. screw rod two; 954. connecting column. DETAILED DESCRIPTION

[0032] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments, and all other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making creative work are within the scope of protection of the present invention.

[0033] See also Figures 1 to 7 A welding fixture for machining, comprising two symmetrically arranged brackets 1, one side of the two brackets 1 is rotatably connected to two turntables 2, and one side of the two turntables 2 is fixedly connected to two support plates 3, and one side of the two support plates 3 is connected to two clamping parts 4;

[0034] The clamping part 4 includes a base plate 41 connected to one side of the support plate 3, a slide seat 43 slidably connected to one side of the base plate 41, a screw rod 42 rotatably connected to the inner side wall of the base plate 41 and screwed inside the slide seat 43, and a handle 44 rotatably connected to the outer surface of one side of the base plate 41, and the handle 44 passes through the base plate 41 and is fixedly connected to one end of the screw rod 42;

[0035] The two turntables 2 are connected through a synchronous transmission unit 9, and the synchronous transmission unit 9 includes a synchronous transmission shaft 94 whose two ends are rotatably connected to the two brackets 1, two synchronous wheels 91 rotatably connected to one side of the two brackets 1, two synchronous wheels 92 rotatably connected to one side of the two brackets 1, and two synchronous belts 93 respectively connecting the two synchronous wheels 1 91 with the two synchronous wheels 2 92. The two synchronous wheels 2 92 are respectively fixedly connected to the two ends of the synchronous transmission shaft 94, and the two brackets 1 are rotatably connected with connecting columns 954, and the two ends of the connecting columns 954 are respectively fixedly connected to the turntable 2 and the adjacent synchronous wheel 1 91.

[0036] The two brackets 1 are both connected to a positioning portion 95, and the positioning portion 95 includes a plurality of positioning flanges 951 integrally formed on the outer surface of the connecting column 954 and evenly distributed in an array on the outer surface of the connecting column 954, a positioning seat 952 slidably connected to the inside of the bracket 1, a limiting flange integrally formed on one side of the positioning seat 952 and used to be inserted between the plurality of positioning flanges 951, and a screw rod 953 screwed to the inside of the bracket 1, and one end of the screw rod 953 is rotatably connected to the other side of the limiting flange.

[0037] The other end of the second screw rod 953 passes through the upper end of the bracket 1 and extends outward.

[0038] By adopting the above technical solution, the two workpieces are respectively placed in the two clamping parts 4, and the screw rod 42 is rotated by the handle 44. The rotation of the screw rod 42 can drive the slide 43 to move toward the workpiece on the base plate 41, and the workpiece can be clamped and positioned by the slide 43 and the protruding part on the base plate 41. After the two workpieces are right-angled, the workpieces are clamped and positioned by the two slides 43 respectively. Since the two clamping parts 4 are not connected, the angle of the right-angle connection of the two workpieces will not be blocked, and the welder can quickly weld the angle. After the inner angle welding is completed, the screw rod 953 is rotated to drive the positioning seat 952 to rise inside the bracket 1, so that the limiting flange on one side of the positioning seat 952 is separated from the positioning flange 951. The synchronous rotation of the two turntables 2 can drive the two support plates 3, the two clamping parts 4 and the two workpieces to rotate synchronously, so as to facilitate the welding personnel to weld different positions of the right-angle connection, avoid the situation of welding in batches caused by the inability to weld the inner angle during welding, and complete the entire welding process more easily and efficiently at one time, thereby reducing the complexity of the welding operation and saving welding time.

[0039] like Figure 2-Figure 4 As shown, an extension support unit 5 is connected to the inside of the base plate 41, and the extension support unit 5 includes a slide 2 51 slidably inserted in the slide 1 43, a screw 2 52 screwed inside one end of the slide 2 51, a slide 3 53 slidably inserted in the base plate 41, a screw 3 54 screwed inside one end of the slide 3 53, two triangular side support blocks 56 respectively fixed to the other ends of the slide 2 51 and the slide 3 53, a back support seat 55 fixed to the other end of the slide 3 53, and one end of the screw 2 52 is rotatably connected to one side of the slide 1 43, and the other end of the screw 2 52 is rotatably connected to the inside of the extension end on one side of the slide 1 43, and one end of the screw 3 54 is rotatably connected to one side of the base plate 41, and the other end of the screw 3 54 is rotatably connected to the inside of the extension end on one side of the base plate 41.

[0040] One side of the two triangular side support blocks 56 is connected to a forward pressure positioning assembly 57, and the forward pressure positioning assembly 57 includes two guide grooves 571 and a screw groove 572 opened inside the triangular side support block 56, a screw 573 screwed in the screw groove 572, two guide rods 574 movably inserted in the two guide grooves 571, a movable seat 575 rotatably connected to one end of the screw 573, a positioning pin 577 fixed to one side of the movable seat 575, a pressure block 576 rotatably sleeved on the outside of the positioning pin 577, and a positioning bolt 578 screwed on the pressure block 576 and the inside of the movable seat 575, and one end of the two guide rods 574 is fixed to one side of the movable seat 575.

[0041] A connecting threaded hole 551 is defined inside the back support seat 55 .

[0042] By adopting the above technical solution, the second screw rod 52 is rotated to drive the second slide 51 to move, the third screw rod 54 is rotated to drive the third slide 53 to move, and the movement of the second slide 51 drives one of the triangular side support blocks 56 to move. Figure 2 and Figure 3It can be seen that the slide seat three 53 is composed of an L-shaped seat body screwed to the outside of the screw rod three 54 and two slide plates fixed at one end to one side of the seat body, the other ends of the two slide plates are slidably inserted into the base plate 41, and the other ends of the two slide plates are extended from the base plate 41 and are fixedly connected to the triangular side support blocks 56 and the back support seat 55 respectively. When the screw rod three 54 drives the seat body to move, the L-shaped seat body can drive the two slide plates to move, and the two slide plates can respectively drive another triangular side support block 56 and the back support seat 55 to move, and the two triangular side support blocks 56 and the back support seat 55 can extend from the clamping part 4 toward the right-angle connection of the workpiece, thereby supporting and limiting the three sides of the area near the connection of the workpiece support legs, and rotating the pressing block 576 allows the pressing block 576 to rotate to the workpiece In front of the workpiece, the positioning bolt 578 is then screwed into the pressure block 576 and the movable seat 575 to prevent the pressure block 576 from rotating, and then the screw 573 is rotated to move the movable seat 575 toward the direction of the triangular side support block 56. When one side of the pressure block 576 contacts the side in front of the workpiece, the pressure block 576 can support and limit the workpiece in front of it. In this way, the four sides of the workpiece are limited by the two triangular side support blocks 56, the back support seat 55 and the pressure block 576, thereby further limiting the deformation and warping of the workpiece. When expansion or stress concentration caused by heat input during welding may cause the right-angle area to shift, the extended support unit 5 can disperse these stresses and resist thermal deformation through compression, thereby keeping the shape and position of the workpiece stable.

[0043] like Figure 1 and Figure 5 As shown, a slide groove 61 is provided on the outside of the two support plates 3, and an anti-bending support unit 6 is connected to the outside of the two support plates 3, and the anti-bending support unit 6 includes a slide seat 4 62 slidably connected in the slide groove 1 61, an extension seat 63 fixedly connected to the lower end of the slide seat 4 62, a slide groove 2 64 provided in the extension seat 63, a screw rod 4 65 rotatably connected to the inside of the slide groove 2 64, a moving seat 66 slidably connected in the slide groove 2 64 and screwed to the outside of the screw rod 4 65, two extension parts 67 fixedly connected to one side of the moving seat 66, a moving clamping seat 69 slidably connected to one side of the moving seat 66 and located between the two extension parts 67, a screw rod 5 68 screwed in one of the extension parts 67, and one end of the screw rod 5 68 is rotatably connected to one side of the moving clamping seat 69, and one end of the screw rod 4 65 passes through the lower end of the extension seat 63 and extends outward.

[0044] Two front pressure limit assemblies 7 are respectively connected to one side of the slide 43, one side of the base plate 41, one side of the movable clamping seat 69 and one side of one of the extensions 67, and the front pressure limit assembly 7 includes two pads 71, fixing bolts 72 screwed in the two pads 71 ​​for fixing the pads 71 ​​on adjacent workpieces, two groups of side plates 74 fixedly connected to one side of the two pads 71, a pressure plate 73 rotatably connected between one group of side plates 74, and an insert 75 clamped in the other group of side plates 74 and used for limiting the pressure plate 73. The four pads 71 ​​are respectively screwed to the slide 43, the base plate 41, the movable clamping seat 69 and one side of one of the extensions 67 by fixing bolts 72.

[0045] By adopting the above technical scheme, after the clamping part 4 clamps the end of the workpiece that needs to be welded at a right angle, the slide seat 4 62 is pushed and made to slide in the slide groove 1 61. The movement of the slide seat 4 62 can drive the extension seat 63 and the movable seat 66 to move, so that the movable seat 66 can move to the middle of the workpiece or the other end of the workpiece. The screw rod 4 65 is rotated to drive the movable seat 66 to slide in the slide groove 2 64, so that the workpiece can enter between one of the extension parts 67 and the movable clamping seat 69. The screw rod 5 68 is rotated to push the movable clamping seat 69 toward the workpiece and clamp the workpiece, so that the workpiece is clamped between the movable clamping seat 69 and one of the extension parts 67, thereby clamping and positioning the other end or the middle of the workpiece, avoiding the situation where the middle part of the long metal workpiece is prone to deflection (bending deformation) under the action of its own weight or external force. The anti-bending support unit 6 can provide additional The external support prevents the workpiece from bending due to gravity or welding stress when building a right angle, improves the overall flatness of the metal workpiece, and ensures that the workpiece meets the design size and shape requirements after welding. At the same time, after the two ends of the workpiece are clamped by the clamping part 4 and the anti-bending support unit 6 respectively, the pressure plates 73 installed on the movable clamping seat 69 and the sliding seat 43 are rotated respectively, so that the raised pressure block 576 on one side of the pressure plate 73 can be pressed on the front side of the workpiece. The pressure plate 73 cooperates with the clamping part 4 and the anti-bending support unit 6 to achieve all-round clamping and positioning of the four sides of the workpiece, and then the two plug blocks 75 are respectively inserted into the two side plates 74 installed on the base plate 41 and one of the extension parts 67. The plug blocks 75 are clamped in the two side plates 74 by snapping. The clamping is a commonly used connection method and will not be repeated here. The pressure plate 73 is limited by the plug blocks 75.

[0046] like Figure 6As shown, the two support plates 3 are internally connected with a welding point alignment adjustment part 8, and the welding point alignment adjustment part 8 includes two movable grooves 81 respectively opened in the two support plates 3 and parallel to each other, two screw rods 6 82 respectively rotatably connected in the two movable grooves 81 and parallel to each other, and two slide seats 5 83 respectively slidably connected in the two movable grooves 81 and respectively screwed on the outside of the two screw rods 6 82, and one side of the two slide seats 5 83 is respectively fixed to one side of the two base plates 41.

[0047] One end of the two screw rods 6 82 respectively passes through the upper ends of the two support plates 3 and extends outward.

[0048] By adopting the above technical solution, when one end of two workpieces are connected to each other and form a right angle (the end face of one workpiece contacts one side face of another workpiece and forms a right angle), since the two slide seats 5 83 are parallel to each other, only one of the screw rods 6 82 needs to be rotated, and the screw rod 6 82 rotates to drive the slide seat 5 83 to move in the movable groove 81, and the slide seat 5 83 moves to drive one of the clamping parts 4 to move. When one of the clamping parts 4 moves, it can drive the clamped workpiece to move, so that the end face or side face of the workpiece is pressed and fits on the side face or end face of the workpiece clamped by the other clamping part 4, improving the connection quality between the two, helping to reduce the tiny gap between the contact surfaces of the workpieces, preventing incomplete filling of the molten pool, gas infiltration or slag inclusion during welding, ensuring that the connection between the two workpieces is tighter and more stable, and the close contact between the end face and the side face can reduce the microscopic unevenness of the contact surface, thereby improving the surface quality of the contact area before welding. The increase in contact pressure makes the surface of the workpiece smoother and the filling of the molten pool more uniform during welding.

[0049] Method of use: put two workpieces into the two clamping parts 4 respectively, rotate the screw rod 1 42 through the handle 44, the rotation of the screw rod 1 42 can drive the slide 1 43 to move on the base plate 41 toward the workpiece, the workpiece can be clamped and positioned through the slide 1 43 and the protruding part on the base plate 41, rotate the screw rod 2 52 to drive the slide 2 51 to move, rotate the screw rod 3 54 to drive the slide 3 53 to move, the movement of the slide 2 51 drives one of the triangular side support blocks 56 to move, the movement of the slide 3 53 can respectively drive the other triangular side support block 56 and the back support seat 55 to move, the two triangular side support blocks 56 and the back support seat 55 can extend from the clamping part 4 toward the right-angle connection of the workpiece, rotate the pressing block 576 so that the pressing block 576 can be rotated to The workpiece is directly in front of the workpiece, and then the positioning bolt 578 is screwed into the pressure block 576 and the movable seat 575 to prevent the pressure block 576 from rotating. The screw rod 573 is then rotated to move the movable seat 575 toward the direction of the triangular side support block 56. When one side of the pressure block 576 contacts the side directly in front of the workpiece, the pressure block 576 can support and limit the workpiece directly in front. In this way, the four sides of the workpiece are limited by the two triangular side support blocks 56, the back support seat 55 and the pressure block 576. After the clamping part 4 clamps the end of the workpiece that needs to be welded at a right angle, the slide seat four 62 is pushed and made to slide in the slide groove 61. The movement of the slide seat four 62 can drive the extension seat 63 and the movable seat 66 to move, so that the movable seat 66 can move to the middle or At the other end of the workpiece, the screw rod four 65 is rotated to drive the movable seat 66 to slide in the slide groove two 64, so that the workpiece can enter between one of the extensions 67 and the movable clamping seat 69, and the screw rod five 68 is rotated to push the movable clamping seat 69 to move toward the workpiece and clamp the workpiece, so that the workpiece is clamped between the movable clamping seat 69 and one of the extensions 67, so as to achieve the clamping and positioning of the other end or the middle of the workpiece, and one of the screw rods six 82 is rotated, and the screw rod six 82 rotates to drive the slide seat five 83 to move in the movable groove 81, and the slide seat five 83 moves to drive one of the clamping parts 4 to move. When one of the clamping parts 4 moves, it can drive the clamped workpiece to move, so that the end face or side face of the workpiece is pressed and fits against the side face of the workpiece clamped by the other clamping part 4. The workpiece is clamped and positioned on the surface or end surface. Since the two clamping parts 4 are not connected, the angle at the right-angle connection of the two workpieces will not be blocked, and the welding personnel can quickly weld the angle. After the inner angle welding is completed, the screw rod 2 953 is rotated to drive the positioning seat 952 to rise inside the bracket 1, so that the limiting flange on one side of the positioning seat 952 is separated from the positioning flange 951. At this time, one of the turntables 2 is rotated, and the rotation of the turntable 2 drives the synchronous wheel 1 91 to rotate through the connecting column 954. The synchronous wheel 1 91 drives the synchronous wheel 2 92 to rotate through the synchronous belt 93. The synchronous wheel 2 92 drives the other synchronous wheel 2 92, the synchronous wheel 1 91 and the turntable 2 to rotate through the synchronous transmission shaft 94, thereby realizing the synchronous rotation of the two turntables 2.The synchronous rotation of the two turntables 2 can drive the two support plates 3, the two clamping parts 4 and the two workpieces to rotate synchronously, thereby facilitating the welding personnel to weld at different positions of the right-angle connection.

[0050] The above is only a preferred specific implementation of the present invention; however, the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical solution and its improved conception within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A welding fixture for machining, comprising two symmetrically arranged brackets (1), characterized in that: One side of the two brackets (1) is rotatably connected to two rotating disks (2), and one side of the two rotating disks (2) is fixedly connected to two supporting plates (3), and one side of the two supporting plates (3) is connected to two clamping parts (4); The clamping portion (4) comprises a base plate (41) connected to one side of the support plate (3), a slide seat (43) slidably connected to one side of the base plate (41), a screw rod (42) rotatably connected to the inner side wall of the base plate (41) and screwed inside the slide seat (43), and a handle (44) rotatably connected to the outer surface of one side of the base plate (41), wherein the handle (44) passes through the base plate (41) and is fixedly connected to one end of the screw rod (42); The two rotating disks (2) are connected via a synchronous transmission unit (9), and the synchronous transmission unit (9) comprises a synchronous transmission shaft (94) whose two ends are respectively rotatably connected to the two brackets (1), two synchronous wheels (91) respectively rotatably connected to one side of the two brackets (1), two synchronous wheels (92) respectively rotatably connected to one side of the two brackets (1), and two synchronous belts (93) respectively connecting the two synchronous wheels (91) and the two synchronous wheels (92), the two synchronous wheels (92) are respectively fixedly connected to the two ends of the synchronous transmission shaft (94), and the two brackets (1) are both rotatably connected with a connecting column (954), and the two ends of the connecting column (954) are respectively fixedly connected to the rotating disk (2) and the adjacent synchronous wheel (91); The base plate (41) is internally connected to an extension support unit (5), and the extension support unit (5) comprises a second slide seat (51) slidably inserted into the inside of the first slide seat (43), a second screw rod (52) screwed into the inside of one end of the second slide seat (51), a third slide seat (53) slidably inserted into the inside of the base plate (41), a third screw rod (54) screwed into the inside of one end of the third slide seat (53), and two screw rods (55) respectively fixed to the other ends of the second slide seat (51) and the third slide seat (53). A triangular side support block (56), a back support seat (55) fixedly connected to the other end of the slide seat three (53), and one end of the screw rod two (52) is rotatably connected to one side of the slide seat one (43), and the other end of the screw rod two (52) is rotatably connected to the inside of the extension end on one side of the slide seat one (43), and one end of the screw rod three (54) is rotatably connected to one side of the base plate (41), and the other end of the screw rod three (54) is rotatably connected to the inside of the extension end on one side of the base plate (41); One side of the two triangular side support blocks (56) is connected to a forward pressure positioning assembly (57), and the forward pressure positioning assembly (57) includes two guide grooves (571) and a screw groove (572) provided inside the triangular side support block (56), a screw rod (573) screwed into the screw groove (572), two guide rods (574) movably inserted into the two guide grooves (571), a movable seat (575) rotatably connected to one end of the screw rod (573), a positioning pin (577) fixedly connected to one side of the movable seat (575), a pressure block (576) rotatably sleeved on the outside of the positioning pin (577), and a positioning bolt (578) screwed into the pressure block (576) and the movable seat (575), and one end of the two guide rods (574) is fixedly connected to one side of the movable seat (575); A connecting threaded hole (551) is provided inside the back support seat (55).

2. A welding fixture for machining according to claim 1, characterized in that: The two brackets (1) are both internally connected with a positioning portion (95), and the positioning portion (95) comprises a plurality of positioning flanges (951) integrally formed on the outer surface of the connecting column (954) and evenly distributed in an array on the outer surface of the connecting column (954), a positioning seat (952) slidably connected to the inside of the bracket (1), a limiting flange integrally formed on one side of the positioning seat (952) and used to be inserted between the plurality of positioning flanges (951), and a second screw rod (953) screwed to the inside of the bracket (1), and one end of the second screw rod (953) is rotatably connected to the other side of the limiting flange.

3. A welding fixture for machining according to claim 2, characterized in that: The other end of the second screw rod (953) passes through the upper end of the bracket (1) and extends outward.

4. A welding fixture for machining according to claim 3, characterized in that: The two support plates (3) are provided with a first slide groove (61) on the outside, and the two support plates (3) are connected to the outside of an anti-flexion support unit (6), and the anti-flexion support unit (6) includes a fourth slide seat (62) slidably connected to the first slide groove (61), an extension seat (63) fixed to the lower end of the fourth slide seat (62), a second slide groove (64) provided inside the extension seat (63), a fourth screw rod (65) rotatably connected to the inside of the second slide groove (64), and a fourth screw rod (65) slidably connected to the inside of the second slide groove (64). A movable seat (66) connected to the outside of the screw rod four (65), two extensions (67) fixedly connected to one side of the movable seat (66), a movable clamping seat (69) slidably connected to one side of the movable seat (66) and located between the two extensions (67), a screw rod five (68) screwed into one of the extensions (67), and one end of the screw rod five (68) is rotatably connected to one side of the movable clamping seat (69), and one end of the screw rod four (65) passes through the lower end of the extension seat (63) and extends outward.

5. A welding fixture for machining according to claim 4, characterized in that: Two front pressure limit assemblies (7) are respectively connected to one side of the slide seat (43), one side of the base plate (41), one side of the movable clamping seat (69) and one side of one of the extensions (67), and the front pressure limit assembly (7) comprises two pads (71), fixing bolts (72) screwed into the two pads (71) for fixing the pads (71) on adjacent workpieces, two groups of side plates (74) fixedly connected to one side of the two pads (71), a pressure plate (73) rotatably connected between one group of side plates (74), and an insert (75) clamped inside the other group of side plates (74) and used for limiting the pressure plate (73). The four pads (71) are respectively screwed to one side of the slide seat (43), the base plate (41), the movable clamping seat (69) and one side of one of the extensions (67) by fixing bolts (72).

6. A welding fixture for machining according to claim 5, characterized in that: The two support plates (3) are both internally connected with a welding point alignment adjustment part (8), and the welding point alignment adjustment part (8) comprises two movable grooves (81) respectively opened in the two support plates (3) and parallel to each other, two screw rods (82) respectively rotatably connected in the two movable grooves (81) and parallel to each other, and two slide seats (83) respectively slidably connected in the two movable grooves (81) and respectively screwed on the outside of the two screw rods (82), and one side of the two slide seats (83) is respectively fixed to one side of the two base plates (41).

7. A welding fixture for machining according to claim 6, characterized in that: One end of each of the two screw rods (82) passes through the upper ends of the two support plates (3) and extends outwards.

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