An inner cone assembly welding tool

Abstract

The utility model provides a kind of inner cone assembly welding tool, including workbench, the top surface of workbench is equipped with the seamless inner expansion mechanism for tensioning round, the top surface of workbench is also provided with positioning support block, press tightly structure, conical supporting block and reverse three-jaw press device;Positioning support block is equipped with multiple, all positioning support block is around setting in the outer circumference of seamless inner expansion mechanism expansion petal, every positioning support block is spaced apart from expansion petal;Press tightly structure is installed in expansion petal top, every expansion petal is equipped with press tightly structure, the press plate of press tightly structure is lifted under the lifting effect of press tightly structure;Conical supporting block is set above press tightly structure by first lifting piece, its outer side is the taper surface structure matching workpiece inner side;Reverse three-jaw press device is installed on conical supporting block by second lifting piece.The tool can facilitate round operation to workpiece, and also can fix workpiece in assembly, improve its welding effect and efficiency.

Description

Technical Field

[0001] This utility model relates to the field of mechanical processing equipment technology, and in particular to a welding fixture for assembling an inner cone. Background Technology

[0002] For assembling internal conical workpieces, spot welding is required at the joints before circumferential welding. Additionally, rounding the cylindrical thin-walled sections is necessary, as in the case of a mixer in an aero-engine welded from two workpieces. For workpiece one, its lower end needs to be rounded, and for workpiece two, the joint with workpiece one needs to be welded. Existing machining fixtures are functionally limited and cannot simultaneously perform both the rounding operation and the welding-assisted fixing operation, resulting in poor welding quality and low welding efficiency. Utility Model Content

[0003] In view of the above, it is necessary to provide a welding fixture for assembling internal cones. This fixture can facilitate the rounding operation of the workpiece and fix the workpiece during assembly, thereby improving the welding effect and efficiency.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0005] A welding fixture for assembling an inner cone includes a worktable. A seamless inner expansion mechanism for tightening and rounding is mounted on the top surface of the worktable. The top surface of the worktable also includes positioning support blocks, a lower clamping structure, a conical support block, and a reverse three-jaw pressing device. Multiple positioning support blocks are arranged around the outer periphery of the expansion petals of the seamless inner expansion mechanism. Each positioning support block is spaced apart from the expansion petals, and its top has a placement portion for placing the workpiece and a limiting portion for limiting the lower end of the workpiece. The limiting portion is located on the side of the placement portion away from the expansion petal, and its top is higher than the placement portion, and the limiting portion is directly opposite the expansion petal. The lower clamping structure is installed on the top of the expansion petal, and each expansion petal is provided with a lower clamping structure. The lower pressure plate of the lower clamping structure is located between the limiting part and the expansion flap, with its plate surface facing the stacking part. The lower pressure plate rises and falls under the lifting action of the lower clamping structure. The conical support block is set above the lower clamping structure through the first lifting component. Its outer surface is a conical structure that matches the inner surface of the workpiece. The central axis of the conical structure is coaxial with the central axis of the expansion flap of the seamless inner expansion mechanism. The conical structure of the conical support block is divided into an upper conical section and a lower conical section. A weld back support is provided between the upper and lower conical sections. The weld back support is arranged around the conical support block and has air vents spaced apart on it. The reverse three-jaw pressing device is installed on the conical support block through the second lifting component. Its claws are spaced apart around the central axis of the conical support block and face the worktable.

[0006] Preferably, the seamless internal expansion mechanism includes at least three expansion petals and at least three servo electric cylinders. All the expansion petals are arranged around and spaced apart. Each expansion petal is slidably disposed with respect to the worktable surface and is connected to at least one servo electric cylinder. The expansion petals slide radially under the drive of the servo electric cylinders.

[0007] Preferably, each expansion segment is provided with at least two positioning support blocks.

[0008] Preferably, the lower pressing structure is a lifting cylinder structure, and a lower pressure plate is installed at the telescopic end of the lower pressing structure.

[0009] Preferably, the cross-section of the lower pressure plate is an inverted L-shaped structure, wherein the vertical side of the L-shaped structure is installed on the telescopic end of the lower pressing structure, the horizontal side of the L-shaped structure is set towards the overlapping part and is located between the expansion petal and the limiting part, and the plate surface where the horizontal side of the L-shaped structure of the lower pressure plate is located is an arc surface.

[0010] Preferably, both the first lifting component and the second lifting component are telescopic cylinder structures.

[0011] Preferably, the top surface of the workbench is provided with a supporting vertical rod, the first lifting component is installed on the top surface of the supporting vertical rod, and the expansion petals of the seamless inner expansion mechanism are arranged around the circumference of the supporting vertical rod.

[0012] Preferably, the weld back support is made of chromium zirconium copper material.

[0013] Preferably, the outer side of the weld back support does not protrude from the conical surface structure of the conical support block, and its cross-section is an L-shaped structure with the L-shaped bend facing outward. An air vent is opened on the vertical side of the L-shaped structure. The air vent is a through hole structure. A vent hole is opened on the conical support block. The vent hole and the air vent hole form a gas flow channel.

[0014] Preferably, the conical support block is hollow in the middle, and the second lifting component is disposed in the hollow part of the conical support block.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This utility model utilizes the tensioning of a seamless internal expansion mechanism to achieve the rounding operation of workpiece one. The seamless internal expansion mechanism, together with the limiting effect of the positioning support block, can clamp and fix workpiece one in the horizontal direction. In addition, with the downward pressing effect of the lower pressing structure, workpiece one cannot move in the vertical direction under the action of the downward pressure. Therefore, the interaction of the seamless internal expansion mechanism, the positioning support block and the lower pressing structure can perform the rounding operation of workpiece one while clamping and fixing workpiece one in all directions, avoiding the displacement of workpiece one in the subsequent welding process and affecting the welding effect.

[0017] 2. This utility model supports the upper part of workpiece one and the lower section of workpiece two by setting a conical support block, with the back protection of the weld back support and the downward pressure of the reverse three-claw pressing device on workpiece two. This allows workpiece two to be fixed and tightly attached to the top of workpiece one, which facilitates welding at the connection between workpiece one and workpiece two and greatly improves the welding effect and welding efficiency. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 yes Figure 1 A schematic diagram of the structure of the conical support block when not shown.

[0020] Figure 3 yes Figure 1 The main view.

[0021] Figure 4 yes Figure 3 AA view.

[0022] Figure 5 yes Figure 3 Top view.

[0023] Figure 6 yes Figure 5 BB view.

[0024] Figure 7 This is a schematic diagram of the structure of the present invention when workpiece one and workpiece two are placed inside.

[0025] Explanation of main component symbols

[0026] In the diagram: 1. Workbench, 1.1. Base plate, 2. Seamless internal expansion mechanism, 2.1. Servo electric cylinder, 2.2. Expansion flap, 3. Positioning support block, 3.1. Laying part, 3.2. Lower pressing structure, 4. Lower pressure plate, 4.1. First lifting component, 5. Conical support block, 6. Upper conical section, 6.1. Lower conical section, 6.2. Weld back support, 7. Second lifting component, 8. Reverse three-jaw pressing device, 9. Supporting vertical rod, 10. Mother plate, 11. Zero point quick change system, 12. Workpiece 1, 13. Workpiece 2, 14.

[0027] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model. Detailed Implementation

[0028] Please see Figure 1-7In a preferred embodiment of this utility model, an internal cone assembly welding fixture includes a worktable 1. A seamless internal expansion mechanism 2 for tightening and rounding is installed on the top surface of the worktable 1. The top surface of the worktable 1 also includes positioning support blocks 3, a lower clamping structure 4, a conical support block 6, and a reverse three-jaw pressing device 9. Multiple positioning support blocks 3 are provided, all surrounding the outer periphery of the expansion petals 2.2 of the seamless internal expansion mechanism 2. Each positioning support block 3 is spaced apart from the expansion petals 2.2, and its top has a placement portion 3.1 for placing the workpiece and a limiting portion 3.2 for limiting the lower end of the workpiece. The limiting portion 3.2 is located on the side of the placement portion 3.1 facing away from the expansion petal 2.2, and the top of the limiting portion 3.2 is higher than the placement portion 3.1, and the limiting portion 3.2 is directly opposite the expansion petal 2.2. The lower clamping structure 4 is installed on the top of the expansion petal 2.2. Each part is equipped with a lower pressing structure 4. The lower pressing plate 4.1 of the lower pressing structure 4 is located between the limiting part 3.2 and the expansion petal 2.2, with its plate surface facing the stacking part 3.1. The lower pressing plate 4.1 rises and falls under the lifting action of the lower pressing structure 4. The conical support block 6 is set above the lower pressing structure 4 through the first lifting member 5. Its outer surface is a conical structure that matches the inner surface of the workpiece. The central axis of the conical structure is coaxially set with the central axis of the expansion petal 2.2 of the seamless inner expansion mechanism 2. The conical structure of the conical support block 6 is divided into an upper conical section 6.1 and a lower conical section 6.2. A weld back support 7 is set between the upper conical section 6.1 and the lower conical section 6.2. The weld back support 7 is arranged around the conical support block 6 and has air vents spaced apart on it. The reverse three-jaw pressing device 9 is installed on the conical support block 6 through the second lifting member 8. Its claws are spaced apart around the central axis of the conical support block 6 and are set towards the worktable 1.

[0029] This invention utilizes a seamless inner expansion mechanism 2, a positioning support block 3, and a lower clamping structure 4 to perform rounding and clamping operations on workpiece 13. Specifically, workpiece 13 is fitted onto the outside of the expansion petal 2.2 of the seamless inner expansion mechanism 2, with its lower end positioned between the limiting part 3.2 of the positioning support block 3 and the expansion petal 2.2. This lower end rests on the overlapping part 3.1 of the positioning support block 3. After the seamless inner expansion mechanism 2 is tightened, it causes the expansion petal 2.2 to abut against the inner wall of workpiece 13, and simultaneously causes the outer wall of workpiece 13 to abut against the limiting part 3.2 of the positioning support block 3. Due to the abutment of the expansion petal 2.2, workpiece 13 achieves rounding and is simultaneously clamped between the expansion petal 2.2 and the limiting part 3. The lower back clamping and fixing is performed by the action of 2. This clamping and fixing is in the horizontal direction. Secondly, the outward expansion of the expansion petal 2.2 will also drive the lower pressing structure 4 to expand outward. The lower pressure plate 4.1 of the lower pressing structure 4 expands outward and then presses down on the top of the inner fold of the workpiece 13 under the lifting action of the lower pressing structure 4. In this way, the workpiece 13 is vertically pressed and limited. The workpiece 13 is fully limited and cannot be moved, which is conducive to the subsequent welding of the top of the workpiece 13 and the bottom of the workpiece 2 14.

[0030] In this utility model, the tensioning principle of the seamless inner expansion mechanism 2 is existing technology, and its structure varies. For this embodiment, it adopts the following structure: The seamless inner expansion mechanism 2 includes at least three expansion petals 2.2 and at least three servo cylinders 2.1, as shown in the attached figure. All the expansion petals 2.2 are arranged around each other and spaced apart. Each expansion petal 2.2 is slidably disposed with the worktable 1 surface. Specifically, the sliding connection can be achieved by the cooperation of a slider and a slide rail on the worktable 1 surface. Each expansion petal 2.2 is connected to at least one servo cylinder 2.1, such as one expansion petal 2.2 connected to one servo cylinder 2.1. The expansion petal 2.2 slides radially under the drive of the servo cylinder 2.1. That is, the servo cylinder 2.1 causes the expansion petal 2.2 to slide radially by extension and retraction, thereby causing the expansion petal 2.2 to expand and tighten or retract and loosen the workpiece. Preferably, in order to facilitate the rounding and clamping of the workpiece 13, each expansion petal 2.2 is provided with at least two positioning support blocks 3. In this embodiment, the lower clamping structure 4 is a lifting cylinder structure, and the telescopic end of the lower clamping structure 4 is equipped with a lower pressure plate 4.1. Preferably, the cross-section of the lower pressure plate 4.1 is an inverted "L"-shaped structure, wherein the vertical side of the L-shaped structure is installed on the telescopic end of the lower clamping structure 4, and the horizontal side of the L-shaped structure is set towards the overlapping part 3.1 and located between the expansion petal 2.2 and the limiting part 3.2. The plate surface where the horizontal side of the L-shaped structure of the lower pressure plate 4.1 is located is an arc surface, which can abut against the lower inner side of the workpiece 13, which can also cooperate with the limiting part 3.2 to clamp and limit the workpiece 13 to a certain extent.

[0031] After workpiece 13 is rounded and clamped in this invention, workpiece 2 14 is placed on top of workpiece 13, with the top of workpiece 13 overlapping the bottom of workpiece 2 14. The overlapping area is the weld seam. After workpiece 2 14 is placed, the conical support block 6 provides back support for workpiece 2 14, and the reverse three-jaw structure presses down to fix the top of workpiece 2 14, so that the bottom of workpiece 2 14 fits tightly with the top of workpiece 13, facilitating subsequent welding operations. For the conical support block 6 of this utility model, before workpiece 13 is placed, it moves downward under the action of the first lifting member 5. After workpiece 13 is placed and clamped and fixed, it is lifted upward under the action of the first lifting member 5. The lower conical section 6.2 of the conical support block 6 contacts the inner wall of the upper section of workpiece 13, which also provides back support for the upper section of workpiece 13. After workpiece 2 14 is placed, the upper conical section 6.1 of the conical support block 6 contacts the inner wall of workpiece 2 14. The overlapping point of workpiece 2 14 and workpiece 13 is located at the location of the weld back support 7 on the conical support block 6. The vent holes facilitate ventilation during welding of the stacked area, serving as a back protection measure. The weld back support 7 is preferably made of chromium zirconium copper material. Preferably, the outer side of the weld back support 7 does not protrude from the conical structure of the conical support block 6. Its cross-section is an L-shaped structure with the L-shaped bend facing outward. Vent holes are opened on the vertical side of the L-shaped structure. The vent holes are through holes. Vent holes are opened on the conical support block 6. The vent holes and vent holes form a gas flow channel. The hot gas generated during welding is dispersed through the vent holes and vent holes, thereby serving as a back protection measure.

[0032] Before assembly and welding, the top of workpiece 2 14 is pressed down and fixed by the claws of the reverse three-jaw pressing device 9, so that workpiece 2 14 fits tightly against workpiece 1 13. Before workpiece 1 13 is placed in, the claws of the reverse three-jaw pressing device 9 retract towards the central axis and move upward away from the conical support block 6 or downward towards the conical support block 6 under the action of the second lifting member 8, so as to move away from the top of workpiece 2 14. When the claws move upwards away from the conical support block 6, after workpiece 2 14 is placed in, the claws of the reverse three-jaw pressing device 9 expand outwards until they are directly above the top of workpiece 2 14. Then, under the action of the second lifting member 8, it moves downwards until the claws of the reverse three-jaw pressing device 9 abut against the top of workpiece 2 14. When the claws move downwards towards the conical support block 6, the second lifting member 8 first extends the claws of the reverse three-jaw pressing device 9 outwards from the outside of workpiece 2 14 and positions them above the top of workpiece 2 14. Then, in the same manner as "when the claws move upwards away from the conical support block 6," the claws of the reverse three-jaw pressing device 9 abut against the top of workpiece 2 14. In this way, the workpiece 2 14 is clamped and fixed by the cooperation of the second lifting member 8 and the reverse three-jaw pressing device 9, preventing the workpiece 2 14 from shifting and affecting the welding effect. In this embodiment, the first lifting member 5 and the second lifting member 8 are both telescopic cylinder structures. Of course, other lifting structures can also be used. Preferably, a supporting vertical rod 10 is provided on the top surface of the worktable 1, the first lifting member 5 is installed on the top surface of the supporting vertical rod 10, and the expansion petals 2.2 of the seamless inner expansion mechanism 2 are arranged around the circumference of the supporting vertical rod 10; the conical support block 6 is hollow in the middle, and the second lifting member 8 is disposed in the hollow part of the conical support block 6. In addition, the structural principle of the outward expansion and retraction of the claw part of the reverse three-jaw pressing structure is the same as the action principle of the claw part of the three-jaw chuck on the existing machine tool. The only difference is that the claw part of the reverse three-jaw pressing structure of this application does not use the outward expansion and retraction principle to clamp and fix the workpiece, but rather achieves downward clamping and fixing by combining the lifting action of the second lifting member 8 on the basis of outward expansion and retraction. Since the outward expansion and retraction principle of the three-jaw chuck claw part is existing technology, this application has not changed its structural principle. Therefore, this utility model will not be described in detail here.

[0033] Finally, it should be noted that the tooling of this utility model assists in the welding operation of the assembled workpiece through spot welding, which is a preliminary welding operation. After the spot welding connection is fixed, the assembled workpiece needs to be rotated 360 degrees to weld the circumferential seam. To avoid repetitive clamping and fixing operations on the workpiece and to facilitate subsequent welding, this embodiment also detachably mounts the worktable 1 onto a mother plate 11 via a zero-point quick-change system 12. After spot welding is completed, the zero-point quick-change system 12 is unlocked, causing the bottom plate 1.1 of the worktable 1 to disengage from the mother plate 11. The worktable 1 can then be moved to the welding area for welding under the action of the four-axis positioner. During welding, the positioner changes to the welding posture of the workpiece, and the workpiece can then be rotated 360 degrees to weld the circumferential seam. In addition, it should be noted that the zero-point quick-change system 12 and the four-axis positioner are existing technologies, and their working principles and specific structures will not be described here.

[0034] The above description is a detailed description of the preferred embodiments of the present utility model. However, the embodiments are not intended to limit the scope of the patent application of the present utility model. All equivalent changes or modifications made under the technical spirit of the present utility model should fall within the patent scope covered by the present utility model.

Claims

1. A welding fixture for assembling an inner cone, comprising a worktable, wherein a seamless inner expansion mechanism for tensioning and rounding is mounted on the top surface of the worktable, characterized in that: The top surface of the workbench is also equipped with positioning support blocks, a lower clamping structure, a conical support block, and a reverse three-jaw pressing device. Multiple positioning support blocks are provided, all surrounding the outer periphery of the expansion petals of the seamless inner expansion mechanism. Each positioning support block is spaced apart from the expansion petal, and its top has a placement portion for placing the workpiece and a limiting portion for limiting the lower end of the workpiece. The limiting portion is located on the side of the placement portion away from the expansion petal, and its top is higher than the placement portion, and it is directly opposite the expansion petal. The lower clamping structure is installed on the top of the expansion petal, and each expansion petal is equipped with a lower clamping structure. The lower pressure plate of the lower clamping structure is located between the limiting portion and the expansion petal. Its plate faces the stacking part, and the lower pressure plate rises and falls under the lifting action of the lower clamping structure; the conical support block is set above the lower clamping structure through the first lifting component, and its outer side is a conical structure that matches the inner side of the workpiece. The central axis of the conical structure is coaxially set with the central axis of the expansion flap of the seamless inner expansion mechanism. The conical structure of the conical support block is divided into an upper conical section and a lower conical section. A weld back support is set between the upper conical section and the lower conical section. The weld back support is arranged around the conical support block and has air vents spaced apart on it; the reverse three-jaw pressing device is installed on the conical support block through the second lifting component. Its claws are spaced apart around the central axis of the conical support block and are set towards the worktable.

2. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: The seamless internal expansion mechanism includes at least three expansion petals and at least three servo electric cylinders. All expansion petals are arranged around and spaced apart. Each expansion petal is slidably disposed with respect to the worktable surface and is connected to at least one servo electric cylinder. The expansion petals slide radially under the drive of the servo electric cylinders.

3. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: Each expansion segment is equipped with at least two positioning support blocks.

4. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: The lower clamping structure is a lifting cylinder structure, and a lower pressure plate is installed at the telescopic end of the lower clamping structure.

5. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: The cross-section of the lower pressure plate is an inverted "L"-shaped structure. The vertical side of the L-shaped structure is installed on the telescopic end of the lower pressing structure, and the horizontal side of the L-shaped structure is set towards the overlapping part and located between the expansion flap and the limiting part. The plate surface where the horizontal side of the L-shaped structure of the lower pressure plate is located is an arc surface.

6. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: Both the first and second lifting components are telescopic cylinder structures.

7. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: The top surface of the workbench is provided with a supporting vertical rod, the first lifting component is installed on the top surface of the supporting vertical rod, and the expansion petals of the seamless inner expansion mechanism are arranged around the circumference of the supporting vertical rod.

8. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: The weld seam back support is made of chromium zirconium copper material.

9. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: The outer side of the weld back support does not protrude from the conical surface structure of the conical support block. Its cross-section is an L-shaped structure with the L-shaped bend facing outward. An air vent is opened on the vertical side of the L-shaped structure. The air vent is a through hole structure. A vent hole is opened on the conical support block. The vent hole and the air vent hole form a gas flow channel.

10. The welding fixture for assembling an inner cone as described in claim 1, characterized in that: The conical support block is hollow in the middle, and the second lifting component is disposed in the hollow part of the conical support block.

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