A welding fixture for turbine shell machining

Abstract

The present application relates to a kind of welding fixtures for turbine shell machining, including base, the base is provided with positioning core and first positioning mechanism, the positioning core is used to place shell and realizes the central positioning of shell, the first positioning mechanism is used to realize the circumferential fixation of turbine shell, the base is provided with second positioning mechanism, third positioning mechanism and fourth positioning mechanism, the second positioning mechanism and third positioning mechanism are all located in the right side of first positioning mechanism, the present application is positioned by spring pin against rotating shaft, realizes the axial positioning of rotating shaft, the clamping of rocker arm is realized by upper taut bar and lower taut bar, the positioning of rocker arm angle is realized, in addition, by extruding seat push valve piece, make valve piece, baffle and bushing in turn abut, realize the positioning between valve piece and rotating shaft along the axial direction of rotating shaft, secondly, by extruding block extruding valve piece and shell, realize the circumferential positioning between valve piece and rotating shaft, to improve the welding precision between valve piece and rotating shaft.

Description

Technical Field

[0001] This invention relates to a welding fixture for turbine housing processing, belonging to the field of turbine housing welding. Background Technology

[0002] The exhaust gas recirculation (EGR) system of turbochargers is used in heavy-duty truck engines, and its biggest challenges during operation are high temperatures and fatigue. Turbochargers typically operate at temperatures between 600 and 650 degrees Celsius, while turbines using AVG (Automated Guided Vehicle) technology can reach temperatures of 1000 degrees Celsius. The high-temperature exhaust gas from each engine stroke is introduced into the turbocharger housing, driving the internal impeller, and then discharged through the exhaust valves and outlet of the turbine housing. Because the engine temperature changes during acceleration, braking, and deceleration, the main failure modes of the turbocharger exhaust valve are high-temperature deformation, plastic deformation caused by alternating temperatures, and thermomechanical fatigue from high-speed opening and closing of the valve. Existing turbocharger exhaust valve assemblies require welding the valve shaft and valve plate together. Current welding processes involve manual TIG welding with manual tooling. However, the manual TIG welding process suffers from unstable welding speed, wire feed rate, and welding trajectory, resulting in inconsistent weld quality.

[0003] Utility model patent application CN202022193042.5 discloses a welding fixture for a turbine housing exhaust valve, comprising a shaft clamping mechanism, a valve plate clamping mechanism, a fixing mechanism, and a positioning mechanism. The shaft clamping mechanism includes a first clamping assembly and a second clamping assembly: the first clamping assembly includes a first fixing member, a first spring pin, and a first pressing member, which presses against a rocker arm to restrict the Steyr vertical shaft from moving axially; the second clamping assembly includes a second fixing member, a second spring pin, and a second pressing member, which presses against a retaining ring to restrict the relative position of the retaining ring on the Steyr vertical shaft. The valve plate clamping mechanism includes a third spring pin, a third pressing member, and a handle assembly, which compresses the third spring, causing the third pressing member to press against the valve plate to restrict the valve plate's movement relative to the Steyr vertical shaft. This utility model provides a turbine housing exhaust valve welding fixture that enables welding at two points: between the valve plate shaft and the valve plate, and between the valve plate shaft and the retaining ring, improving the stability of the welding process and increasing welding efficiency; it also simplifies clamping. However, with the improvement of machining precision, such as Figure 12-15 As shown, there are dimensional requirements for the angle of the rocker arm and the gap between the rocker arm and the bushing, but the positional accuracy of the rocker arm cannot be guaranteed in the existing technology.

[0004] Therefore, a welding fixture for turbine housing machining is needed to improve the positional accuracy of the rocker arm after welding. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a welding fixture for turbine housing processing to overcome the shortcomings of the prior art and improve the positional accuracy of the rocker arm after welding.

[0006] The technical solution adopted by the present invention to solve the above problems is as follows: a welding fixture for turbine housing processing, including a base, a positioning core and a first positioning mechanism are provided on the base, the positioning core is used to place the housing and realize the center positioning of the housing, the first positioning mechanism is used to realize the circumferential fixation of the turbine housing, the base is provided with a second positioning mechanism, a third positioning mechanism and a fourth positioning mechanism, the second positioning mechanism and the third positioning mechanism are both located to the right of the first positioning mechanism, the fourth positioning mechanism is located to the left of the first positioning mechanism, and the second positioning mechanism is used to realize the axial positioning of the rotating shaft;

[0007] The third positioning mechanism includes an upper clamping rod and a lower clamping rod arranged at intervals. Both the upper clamping rod and the lower clamping rod are vertically arranged. A third positioning seat is detachably fixed on the base. The bottom end of the lower clamping rod is inserted into the top of the third positioning seat. The lower clamping rod is threadedly connected to the third positioning seat. A rotating plate is provided on the upper clamping rod. The upper clamping rod passes through the rotating plate. The upper clamping rod is threadedly connected to the rotating plate. The rotating plate is fixedly connected to the base.

[0008] The fourth positioning mechanism includes a fourth positioning seat, which is detachably and fixedly mounted on a base. A rotating plate is mounted on the fourth positioning seat. One end of the rotating plate is rotatably connected to the fourth positioning seat via a pin. A pressing seat is fixedly mounted on the other end of the rotating plate. A pressing block is mounted on the pressing seat. A first magnet is fixedly mounted on the right side of the fourth positioning seat, and the first magnet is located below the rotating plate.

[0009] Preferably, the first positioning mechanism includes a first positioning seat, which is detachably and fixedly mounted on the base. The first positioning seat is provided with a first positioning screw and a first tightening rod is threadedly connected to the first positioning seat.

[0010] Preferably, the top of the base is provided with a sliding groove, which matches the first positioning seat, and the first positioning seat is inserted into the sliding groove.

[0011] Preferably, the second positioning mechanism includes a second positioning seat, which is detachably and fixedly mounted on the base, and a spring pin is provided on the second positioning seat.

[0012] Preferably, the rotating plate is fitted to the top of the second positioning seat, and a fixing screw is vertically inserted on the rotating plate, the fixing screw being threadedly connected to the second positioning seat.

[0013] Preferably, the fourth positioning seat is provided with two adjustment slots, which are arranged symmetrically front to back. A first adjustment screw is inserted in the adjustment slot and is threadedly connected to the extrusion seat.

[0014] Preferably, the rotating plate is provided with a second adjusting screw, which passes through the rotating plate and is threadedly connected to the rotating plate.

[0015] Preferably, the extrusion seat is provided with a cleaning mechanism located on the side of the pin near the extrusion seat. The cleaning mechanism includes an air tube that is fixedly passed through the extrusion seat. A movable disk and a return spring are provided inside the air tube. The movable disk is slidably and sealed to the air tube. The movable disk is connected to the inner wall of the air tube through the return spring. A second magnet is provided between the air tube and the pin. The second magnet is fixedly connected to the air tube through a connecting rod. A gooseneck tube is installed at the end of the air tube away from the pin.

[0016] Preferably, the extrusion seat is provided with an inclined surface.

[0017] A method for welding and positioning a turbine housing includes the following steps:

[0018] S1. Pre-weld the rotating shaft and rocker arm;

[0019] S2. After passing the rotating shaft through the bushing, place the retaining ring and valve plate inside the housing and then fit them onto the rotating shaft in sequence.

[0020] S3. Insert the turbine housing into the positioning core, with the mounting surface of the flange end abutting against the first positioning screw, and then rotate the first tightening rod to abut against the outer wall of the flange end.

[0021] S4. Place a shim between the rocker arm and the bushing, hold the rocker arm in place with a spring pin, and make the rocker arm, shim and bushing fit together in sequence to achieve axial fixation of the shaft and determination of the gap between the bushing and the rocker arm.

[0022] S5. Rotate the upper and lower clamping rods to make them abut against the top and bottom of the rocker arm respectively, thereby fixing the rocker arm circumferentially.

[0023] S6. The rotating plate rotates around the pin shaft, causing the inclined surface on the extrusion seat to push the valve plate, thereby achieving sequential contact between the valve plate, the retaining ring, and the bushing. At the same time, the extrusion block extrudes the valve plate, causing the valve plate to be pressed and fitted against the exhaust port of the housing.

[0024] S7. Perform welding at the welding point to fix the valve plate to the rotating shaft.

[0025] Compared with the prior art, the advantages of the present invention are as follows:

[0026] 1. The axial positioning of the rotating shaft is achieved by holding the rotating shaft with a spring pin. The rocker arm is positioned by clamping it with the upper and lower clamping rods. In addition, the valve plate, retaining ring and bushing are pushed by the extrusion seat to achieve the axial positioning of the valve plate and the rotating shaft. Then, the valve plate is pressed into the housing by the extrusion block to achieve the circumferential positioning of the valve plate and the rotating shaft, thereby improving the welding accuracy between the valve plate and the rotating shaft.

[0027] 2. Determine the clearance between the bushing and the rocker arm by placing a shim between the rocker arm and the bushing;

[0028] 3. The air discharged through the air pipe acts on the welding hole to blow away the dust on the welding part and prevent the dust from affecting the welding effect;

[0029] 4. By rotating the extrusion seat through the rotating plate, the valve plate can be positioned axially and circumferentially on the rotating shaft at the same time, which improves the convenience of operation. Attached Figure Description

[0030] Figure 1 This is a perspective view of a welding fixture for machining a turbine housing according to the present invention;

[0031] Figure 2 This is a front view of a welding fixture for machining a turbine housing according to the present invention;

[0032] Figure 3 This is a left view of a welding fixture for machining a turbine housing according to the present invention;

[0033] Figure 4 This is a top view of a welding fixture for machining a turbine housing according to the present invention;

[0034] Figure 5 This is a schematic diagram of the first positioning mechanism;

[0035] Figure 6 This is a schematic diagram of the second positioning mechanism;

[0036] Figure 7 This is a schematic diagram of the third positioning mechanism;

[0037] Figure 8 This is a schematic diagram of the fourth positioning mechanism;

[0038] Figure 9 This is a schematic diagram of the connection structure between the extrusion block and the valve plate;

[0039] Figure 10 A 3D view of the cleaning facility;

[0040] Figure 11 An exploded view of the cleaning facility;

[0041] Figure 12A perspective view of the turbine housing;

[0042] Figure 13 This is a schematic diagram of the valve assembly.

[0043] Figure 14 This is a top view of the turbine casing;

[0044] Figure 15 for Figure 14 The projection diagram along direction A.

[0045] in:

[0046] Base 1, positioning core 2, first positioning mechanism 3, second positioning mechanism 4, third positioning mechanism 5, fourth positioning mechanism 6, cleaning mechanism 7, turbine housing 8;

[0047] First positioning seat 31, first positioning screw 32, first clamping rod 33, slide groove 34;

[0048] Second positioning seat 41, spring pin 42, washer 43;

[0049] Upper clamping rod 51, lower clamping rod 52, third positioning seat 53, rotating plate 54, fixing screw 55;

[0050] Fourth positioning seat 61, rotating plate 62, pin 63, pressing seat 64, pressing block 65, first magnet 66, adjusting groove 67, first adjusting screw 68, second adjusting screw 69;

[0051] Incline 64.1;

[0052] 71. Trachea; 72. Moving disc; 73. Return spring; 74. Second magnet; 75. Connecting rod; 76. Gooseneck tube;

[0053] 81 housing, 82 valve assembly, 83 flange end;

[0054] Bushing 82.1, rotating shaft 82.2, rocker arm 82.3, valve plate 82.4, retaining ring 82.5, welding hole 82.6, welding part 82.7. Detailed Implementation

[0055] like Figure 1-11As shown, a welding fixture for turbine housing processing in this embodiment includes a base 1, on which a positioning core 2 and a first positioning mechanism 3 are provided. The turbine housing 8 includes a housing 81 and a valve assembly 82. The housing 81 is provided with a flange end 83. The valve assembly 82 includes a bushing 82.1, a rotating shaft 82.2, a rocker arm 82.3, a valve plate 82.4, and a retaining ring 82.5. Both the bushing 82.1 and the rotating shaft 82.2 are cylindrical. The bushing 82.1 is fixedly inserted into the housing 81, and the rotating shaft 82.2 coaxially passes through the bushing 82.1. One end of the rotating shaft 82.2 is located inside the housing 81, and the other end of the rotating shaft 82.2 is located outside the housing 81. The rocker arm 82.3 is fixedly mounted on the outer end of the rotating shaft 82.2. The valve plate 82.4 is fitted against the exhaust port of the housing 81 and is sleeved on the rotating shaft 82.2. The retaining ring 82.5 is located between the valve plate 82.4 and the bushing 82.1, and the retaining ring 82.5 abuts against both the valve plate 82.4 and the bushing 82.1. The valve plate 82.4 is provided with a welding hole 82.6, and the rotating shaft 82.2 is welded at the welding hole 82.6 as a welded part 82.7. At welding section 82.7, the welding shaft 82.2 and valve plate 82.4 are welded and fixed. The welding hole 82.6 is an elongated oval hole of a certain length, such as a kidney-shaped hole. The valve plate 82.4 is made of stainless steel, and the welding shaft 82.2 is made of Stellite, a hard alloy that is resistant to various types of wear, corrosion, and high-temperature oxidation. The positioning core 2 is used to place the housing 81 and achieve center positioning of the housing 81. That is, when the housing 81 is placed, the positioning core 2 is inserted into the center hole of the housing 81, and the positioning core 2 matches the center hole. The first positioning mechanism 3 acts on the flange end of the housing 81. 83 is used to fix the turbine housing 8 circumferentially. The base 1 is provided with a second positioning mechanism 4, a third positioning mechanism 5 and a fourth positioning mechanism 6. The second positioning mechanism 4 and the third positioning mechanism 5 are both located to the right of the first positioning mechanism 3, and the fourth positioning mechanism 6 is located to the left of the first positioning mechanism 3. The second positioning mechanism 4 is used to realize the axial positioning of the rotating shaft 82.2, that is, to realize the positioning between the rocker arm 82.3 and the bushing 82.1. The third positioning mechanism 5 is used to realize the angular positioning of the rocker arm 82.3. The fourth positioning mechanism 6 is used to realize the positioning of the valve plate 82.4.

[0056] The first positioning mechanism 3 includes a first positioning seat 31, which is detachably and fixedly mounted on the base 1. A first positioning screw 32 is provided on the first positioning seat 31. The first positioning screw 32 abuts against the assembly surface of the flange end 83. A first tightening rod 33 is threadedly connected to the first positioning seat 31. The first tightening rod 33 abuts against the outer wall of the flange end 83. In this way, the circumferential positioning of the housing 81 is achieved.

[0057] The top of the base 1 is provided with a sliding groove 34, which matches the first positioning seat 31. The first positioning seat 31 is inserted into the sliding groove 34, and the first positioning seat 31 can move within the sliding groove 34 to adjust the position of the first positioning seat 31.

[0058] The second positioning mechanism 4 includes a second positioning seat 41, which is detachably and fixedly mounted on the base 1. A spring pin 42 is provided on the second positioning seat 41. The spring pin 42 is an indexing self-locking spring return pin. After the first positioning mechanism 3 has positioned the housing 81, the rotating shaft 82.2 is parallel to the left-right direction, and the spring pin 42 is parallel to the rotating shaft 82.2. Before the turbine housing 8 is placed on the positioning core 2, the top pin of the spring pin 42 is first pulled and rotated, causing the spring... The top pin of pin 42 is in a retracted self-locking state. When it is necessary to axially position the rotating shaft 82.2, first place a shim 43 between the rocker arm 82.3 and the bushing 82.1. The thickness of the shim 43 is the same as the thickness shown in the drawing. Then, rotate the top pin of spring pin 42 in the opposite direction to unlock it and move it in the opposite direction to press against the rocker arm 82.3, so that the shim 43 abuts against the bushing 82.1 and the rocker arm 82.3 respectively. In this way, the axial fixation of the rotating shaft 82.2 and the determination of the gap between the bushing 82.1 and the rocker arm 82.3 are achieved.

[0059] The third positioning mechanism 5 includes an upper clamping rod 51 and a lower clamping rod 52 arranged vertically at intervals. Both the upper clamping rod 51 and the lower clamping rod 52 are vertically arranged. A third positioning seat 53 is detachably fixed on the base 1. The bottom end of the lower clamping rod 52 is inserted into the top of the third positioning seat 53, and the lower clamping rod 52 is threadedly connected to the third positioning seat 53. A rotating plate 54 is fitted against the top of the second positioning seat 41. A fixing screw 55 is vertically inserted through the rotating plate 54 and threadedly connected to the second positioning seat 41. The upper clamping rod 51 passes through the rotating plate 54 and is threadedly connected to the rotating plate 54. During the axial positioning of the rotating shaft 82.2, the fixing screw 55 is loosened. The rotating plate 54 drives the upper clamping rod 51 to rotate around the fixing screw 55, which facilitates the expansion of the axial positioning space of the rotating shaft 82.2. After the axial positioning of the rotating shaft 82.2 is completed, the rotating plate 54 drives the upper clamping rod 51 to rotate in the opposite direction to achieve reset, and tightens the fixing screw 55. At this time, the upper clamping rod 51 is located above the rocker arm 82.3. Then, the upper clamping rod 51 is rotated so that the top of the upper clamping rod 51 abuts against the rocker arm 82.3. The angle of the rocker arm 82.3 is fixed by clamping the rocker arm 82.3 by the upper clamping rod 51 and the lower clamping rod 52. The height of the upper clamping rod 51 and the lower clamping rod 52 can be adjusted by rotating the upper clamping rod 51 and the lower clamping rod 52, that is, the positioning angle of the rocker arm 82.3 can be adjusted according to the size requirements.

[0060] The fourth positioning mechanism 6 includes a fourth positioning seat 61, which is detachably and fixedly mounted on the base 1. A rotating plate 62 is mounted on the fourth positioning seat 61. One end of the rotating plate 62 is rotatably connected to the fourth positioning seat 61 via a pin 63. A pressing seat 64 is fixedly mounted on the other end of the rotating plate 62. A pressing block 65 is mounted on the pressing seat 64. A first magnet 66 is fixedly mounted on the right side of the fourth positioning seat 61, located below the rotating plate 62. The rotating plate 62 is made of iron. An inclined surface 64.1 is provided on the pressing seat 64. Before the turbine housing 8 is placed on the positioning core 2, the rotating plate 62 rotates to the left around the pin 63 to provide space for placing the turbine housing 8. After the turbine housing 8 is placed on the positioning core 2 and the angle of the rocker arm 82.3 is fixed, the rotating plate 62 drives the pressing seat 64 to reverse. During the rotation and reverse rotation, the inclined surface 64.1 on the extrusion seat 64 abuts against the left side of the valve plate 82.4. As the extrusion seat 64 continues to rotate in the reverse direction, the valve plate 82.4 is pushed to the right, that is, the valve plate 82.4 moves to the right on the rotating shaft 82.2, and the retaining ring 82.5 abuts against the valve plate 82.4 and the bushing 82.1 respectively. In addition, as the extrusion seat 64 rotates in the reverse direction, the extrusion block 65 abuts against the top of the valve plate 82.4. Through the extrusion block 65 extruding the valve plate 82.4, the valve plate 82.4 is made to fit against the exhaust port of the housing 81. In this way, not only is the positioning of the valve plate 82.4 achieved, but also the vertical positioning of the housing 81 is achieved. At this time, through the mutual attraction between the first magnet 66 and the iron rotating plate 62, the rotating plate 62 is subjected to a downward attraction force, thereby providing the pressure generated by the extrusion block 65 on the valve plate 82.4.

[0061] The fourth positioning seat 61 is provided with two adjustment slots 67, which are arranged symmetrically front and rear. A first adjustment screw 68 is inserted in the adjustment slot 67. The first adjustment screw 68 is threadedly connected to the extrusion seat 64. When the first adjustment screw 68 is loosened, it can move left and right in the adjustment slot 67, which drives the extrusion seat 64 to move left and right. Thus, the position of the extrusion seat 64 can be adjusted according to the size of the turbine housing 8.

[0062] The rotating plate 62 is provided with a second adjusting screw 69, which passes through the rotating plate 62 and is threadedly connected to the rotating plate 62. When the first magnet 66 attracts the rotating plate 62, the end of the second adjusting screw 69 abuts against the top of the first magnet 66. By rotating the second adjusting screw 69, the position of the second adjusting screw 69 on the rotating plate 62 can be adjusted, thereby adjusting the rotation angle of the rotating plate 62, so that the extrusion seat 64 can adjust the rotation angle according to the size of the turbine housing 8.

[0063] A cleaning mechanism 7 is provided on the extrusion seat 64, and the cleaning mechanism 7 is located on the side of the pin 63 near the extrusion seat 64.

[0064] The cleaning mechanism 7 includes an air tube 71, which is fixedly passed through the compression seat 64. A movable disk 72 and a return spring 73 are provided inside the air tube 71. The movable disk 72 is slidably and sealed to the air tube 71. The movable disk 72 is connected to the inner wall of the air tube 71 through the return spring 73. A second magnet 74 is provided between the air tube 71 and the pin 63. The second magnet 74 is fixedly connected to the air tube 71 through a connecting rod 75. A gooseneck tube 76 is installed at the end of the air tube 71 away from the pin 63.

[0065] During the rotation of the rotating plate 62 to the right, causing the pressing block 65 to abut against the top of the valve plate 82.4, calculations reduce the distance between the second magnet 74 and the first magnet 66. In effect, a repulsive force is generated between the second magnet 74 and the first magnet 66. When this force exceeds the elastic force of the return spring 73, the second magnet, via the connecting rod 75, drives the moving disc 72 to move away from the pin 63 within the air pipe 71, causing the return spring 73 to deform. Thus, air within the air pipe 71 passes through... The air is squeezed, expelled, and transported to the gooseneck tube 76. The air in the gooseneck tube 76 is discharged and acts on the welding hole 82.6, blowing away the dust on the welding part 82.7 and preventing the dust from affecting the welding effect. When the rotating plate 62 rotates in the reverse direction, the distance between the second magnet 74 and the first magnet 66 increases. When the mutual repulsion force between the second magnet 74 and the first magnet 66 is less than the elastic force of the return spring 73, the elastic force of the return spring 73 causes the moving plate 72 to move in the reverse direction in the air tube 71 until it is reset.

[0066] In summary, during the fixing of the turbine housing 8, the axial positioning of the rotating shaft 82.2 is achieved by the spring pin 42 pressing against it. The angle positioning of the rocker arm 82.3 is achieved by the clamping of the upper clamping rod 51 and the lower clamping rod 52. In addition, the valve plate 82.4 is pushed by the pressing seat 64 so that the valve plate 82.4, the retaining ring 82.5 and the bushing 82.1 abut against each other in sequence, thereby achieving the positioning of the valve plate 82.4 and the rotating shaft 82.2 in the axial direction of the rotating shaft 82.2. Furthermore, the valve plate 82.4 is pressed into the housing 81 by the pressing block 65, thereby achieving the positioning of the valve plate 82.4. The circumferential positioning between valve plate 82.4 and rotating shaft 82.2 improves the welding accuracy between valve plate 82.4 and rotating shaft 82.2. By setting shim 43 between rocker arm 82.3 and bushing 82.1, the gap between bushing 82.1 and rocker arm 82.3 is determined. In addition, the air discharged through air pipe 71 acts on the welding hole 82.6 to blow away the dust on the welding part 82.7, avoiding the dust from affecting the welding effect. By rotating plate 62 to drive the extrusion seat 64 to rotate, valve plate 82.4 can be positioned axially and circumferentially on rotating shaft 82.2 at the same time, which improves the convenience of operation.

[0067] A method for welding and positioning a turbine housing includes the following steps:

[0068] S1. Pre-welded rotating shaft 82.2 and rocker arm 82.3;

[0069] S2. After passing the rotating shaft 82.2 through the bushing 82.1, place the retaining ring 82.5 and the valve plate 82.4 inside the housing 81 and then fit them onto the rotating shaft 82.2 in sequence.

[0070] S3. Insert the turbine housing 8 into the positioning core 2, with the mounting surface of the flange end 83 abutting against the first positioning screw 32, and then rotate the first tightening rod 33 to abut against the outer wall of the flange end 83.

[0071] S4. Place a shim 43 between the rocker arm 82.3 and the bushing 82.1, and hold the rocker arm 82.3 in place with the spring pin 42. Make the rocker arm 82.3, the shim 43 and the bushing 82.1 fit together in sequence to achieve axial fixation of the rotating shaft 82.2 and determine the gap between the bushing 82.1 and the rocker arm 82.3.

[0072] S5. Rotate the upper clamping rod 51 and the lower clamping rod 52 so that the upper clamping rod 51 and the lower clamping rod 52 abut against the top and bottom of the rocker arm 82.3 respectively, thereby fixing the rocker arm 82.3 circumferentially.

[0073] S6. Rotating plate 62 rotates around pin 63, causing inclined surface 64.1 on extrusion seat 64 to push valve plate 82.4, so that valve plate 82.4, retaining ring 82.5 and bushing 82.1 are pressed together in sequence, while extrusion block 65 extrudes valve plate 82.4, so that valve plate 82.4 is pressed and pressed together with exhaust port of housing 81.

[0074] S7. Welding is performed at the welding part 82.7 to fix the valve plate 82.4 and the rotating shaft 82.2.

[0075] In addition to the above embodiments, the present invention also includes other embodiments. All technical solutions formed by equivalent transformation or equivalent substitution should fall within the protection scope of the claims of the present invention.

Claims

1. A welding fixture for machining a turbine housing, the turbine housing comprising a housing (81) and a valve assembly (82), wherein the housing (81) is provided with a flange end (83), and the valve assembly (82) comprises a bushing (82.1), a rotating shaft (82.2), a rocker arm (82.3), a valve plate (82.4), and a retaining ring (82.5), wherein the bushing (82.1) and the rotating shaft (82.2) are both cylindrical, the bushing (82.1) is fixedly inserted into the housing (81), the rotating shaft (82.2) coaxially passes through the bushing (82.1), one end of the rotating shaft (82.2) is located inside the housing (81), and the rotating shaft (82.2) is further disposed within the housing (81). .2) The other end is located outside the housing (81). The rocker arm (82.3) is fixedly installed on the outer end of the rotating shaft (82.2). The valve plate (82.4) is attached to the exhaust port of the housing (81). The valve plate (82.4) is sleeved on the rotating shaft (82.2). The retaining ring (82.5) is located between the valve plate (82.4) and the bushing (82.1). The retaining ring (82.5) abuts against the valve plate (82.4) and the bushing (82.1) respectively. The valve plate (82.4) is provided with a welding hole (82.6). The rotating shaft (82.2) is located at the welding hole (82.6) as a welded part (82.7). The welding fixture includes a base (1), on which a positioning core (2) and a first positioning mechanism (3) are provided. The positioning core (2) is used to place the housing (81) and achieve center positioning of the housing (81). The first positioning mechanism (3) is used to achieve circumferential fixation of the turbine housing (8). The fixture is characterized by: The base (1) is provided with a second positioning mechanism (4), a third positioning mechanism (5) and a fourth positioning mechanism (6). The second positioning mechanism (4) and the third positioning mechanism (5) are both located to the right of the first positioning mechanism (3), and the fourth positioning mechanism (6) is located to the left of the first positioning mechanism (3). The second positioning mechanism (4) is used to realize the axial positioning of the rotating shaft (82.2). The third positioning mechanism (5) includes an upper clamping rod (51) and a lower clamping rod (52) arranged at intervals. Both the upper clamping rod (51) and the lower clamping rod (52) are vertically arranged. A third positioning seat (53) is detachably fixed on the base (1). The bottom end of the lower clamping rod (52) is inserted into the top of the third positioning seat (53). The lower clamping rod (52) is threadedly connected to the third positioning seat (53). A rotating plate (54) is provided on the upper clamping rod (51). The upper clamping rod (51) passes through the rotating plate (54). The upper clamping rod (51) is threadedly connected to the rotating plate (54). The rotating plate (54) is fixedly connected to the base (1). The fourth positioning mechanism (6) includes a fourth positioning seat (61), which is detachably and fixedly mounted on the base (1). A rotating plate (62) is mounted on the fourth positioning seat (61). One end of the rotating plate (62) is rotatably connected to the fourth positioning seat (61) via a pin (63). A pressing seat (64) is fixedly mounted on the other end of the rotating plate (62). A pressing block (65) is mounted on the pressing seat (64). A first magnet (66) is fixedly mounted on the right side of the fourth positioning seat (61). The first magnet (66) is located below the rotating plate (62). A cleaning mechanism (7) is provided on the extrusion seat (64). The cleaning mechanism (7) is located on the side of the pin (63) near the extrusion seat (64). The cleaning mechanism (7) includes an air pipe (71). The air pipe (71) is fixedly passed through the extrusion seat (64). A movable disk (72) and a return spring (73) are provided inside the air pipe (71). The movable disk (72) is slidably and sealed to the air pipe (71). The movable disk (72) is connected to the inner wall of the air pipe (71) through the return spring (73). A second magnet (74) is provided between the air pipe (71) and the pin (63). The second magnet (74) is fixedly connected to the air pipe (71) through a connecting rod (75). A gooseneck tube (76) is installed at the end of the air pipe (71) away from the pin (63).

2. The welding fixture for turbine housing machining according to claim 1, characterized in that: The first positioning mechanism (3) includes a first positioning seat (31), which is detachably fixed on the base (1). A first positioning screw (32) is provided on the first positioning seat (31), and a first tightening rod (33) is threadedly connected to the first positioning seat (31).

3. The welding fixture for turbine housing machining according to claim 2, characterized in that: The base (1) is provided with a sliding groove (34) at its top. The sliding groove (34) matches the first positioning seat (31), and the first positioning seat (31) is inserted into the sliding groove (34).

4. A welding fixture for machining a turbine housing according to claim 3, characterized in that: The second positioning mechanism (4) includes a second positioning seat (41), which is detachably fixed on the base (1), and a spring pin (42) is provided on the second positioning seat (41).

5. A welding fixture for turbine housing machining according to claim 4, characterized in that: The rotating plate (54) is attached to the top of the second positioning seat (41), and a fixing screw (55) is vertically inserted on the rotating plate (54). The fixing screw (55) is threadedly connected to the second positioning seat (41).

6. A welding fixture for turbine housing machining according to claim 5, characterized in that: The fourth positioning seat (61) is provided with two adjustment slots (67), which are arranged symmetrically in front and behind. A first adjustment screw (68) is inserted in the adjustment slot (67), and the first adjustment screw (68) is threadedly connected to the pressing seat (64).

7. A welding fixture for turbine housing machining according to claim 6, characterized in that: The rotating plate (62) is provided with a second adjusting screw (69), which passes through the rotating plate (62) and is threadedly connected to the rotating plate (62).

8. A welding fixture for machining a turbine housing according to claim 7, characterized in that: The extrusion seat (64) is provided with an inclined surface (64.1).

9. A method for welding and positioning a turbine housing, characterized in that: The method of using the welding fixture for turbine housing machining as described in claim 8 includes the following steps: S1. Pre-welded pivot (82.2) and rocker arm (82.3); S2. After passing the rotating shaft (82.2) through the bushing (82.1), place the retaining ring (82.5) and valve plate (82.4) inside the housing (81) and then fit them onto the rotating shaft (82.2) in sequence. S3. Insert the turbine housing (8) into the positioning core (2), with the mounting surface of the flange end (83) abutting against the first positioning screw (32), and then rotate the first tightening rod (33) to abut against the outer wall of the flange end (83); S4. Place a shim (43) between the rocker arm (82.3) and the bushing (82.1), and hold the rocker arm (82.3) in place by the spring pin (42). Make the rocker arm (82.3), the shim (43) and the bushing (82.1) fit together in sequence to achieve axial fixation of the shaft (82.2) and determination of the gap between the bushing (82.1) and the rocker arm (82.3). S5. Rotate the upper clamping rod (51) and the lower clamping rod (52) so that the upper clamping rod (51) and the lower clamping rod (52) abut against the top and bottom of the rocker arm (82.3) respectively, thereby fixing the rocker arm (82.3) circumferentially. S6. The rotating plate (62) rotates around the pin (63), causing the inclined surface (64.1) on the extrusion seat (64) to push the valve plate (82.4), thereby achieving the sequential close contact of the valve plate (82.4), the retaining ring (82.5), and the bushing (82.1). At the same time, the extrusion block (65) extrudes the valve plate (82.4), causing the valve plate (82.4) to be pressed and adhered to the exhaust port of the housing (81). S7. Welding is performed at the welding part (82.7) to fix the valve plate (82.4) and the rotating shaft (82.2).

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