positioner

Abstract

This utility model provides a positioner in which a bearing seat on the frame rotates in conjunction with a trunnion on a tilting seat. A chuck on the tilting seat constrains and fixes the workpiece to be processed. A tilting drive mechanism drives the tilting seat to tilt around the trunnion axis, and a rotation drive mechanism drives the chuck to rotate around its own disc core. The tilting drive mechanism is equipped with a self-locking structure to maintain the tilting posture of the tilting seat. This utility model mainly achieves this by incorporating a self-locking structure in the tilting drive mechanism, enabling it to maintain the tilting posture of the tilting seat, facilitating the welding torch to perform welding actions on the workpiece clamped on the chuck, and ensuring the reliability and stability of the positioner's operation.

Description

Technical Field

[0001] This utility model relates to the field of welding technology, specifically to a positioner. Background Technology

[0002] Positioners are widely used in arc welding operations. For workpieces with complex structures, positioners can change the posture of the workpiece by rotating and flipping it, allowing the welding torch to reach all welding areas without obstruction. In circumferential welding, positioners can also be linked with the welding power source to achieve continuous and uninterrupted welding.

[0003] The technical solution disclosed in the patent entitled "A Welding Positioner" (CN107627069A) has a tilting frame 2 connected above the support wall 11. The tilting frame 2 is connected to a turntable 4 above the rotating support 3 and a rotary motor 7 is provided below. The output end of the rotary motor 7 drives the turntable 4 to rotate through gear meshing with a ring rack. A sector gear 8 is fixedly connected to one side of the tilting frame 2. The gear at the output end of the tilting motor 9 meshes with the sector gear 8 to drive the tilting frame 2 to tilt.

[0004] The aforementioned patent only discloses that the flipping frame 2 is driven to flip by the flipping motor 9. However, the motor itself does not have self-locking capability, meaning that the flipping frame 2 in the above solution cannot maintain its flipping posture and cannot meet the welding requirements. It is necessary to optimize and improve it. Utility Model Content

[0005] The purpose of this invention is to provide a positioner that can adjust and maintain the posture of the workpiece to be welded.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a positioner, wherein a bearing seat on the frame and a trunnion horizontally arranged on the tilting seat form a rotational fit, a chuck is arranged on the seat surface of the tilting seat, the core of the chuck is coplanar and perpendicular to the core of the trunnion, the chuck constrains and fixes the workpiece to be processed by the radial displacement of the jaws along the surface of the chuck, a tilting drive mechanism is arranged between the frame and the tilting seat to drive the tilting seat to tilt around the core of the trunnion, a rotation drive mechanism is arranged between the tilting seat and the chuck to drive the chuck to rotate around its own core, a locking mechanism is arranged between the chuck and the jaws to drive the jaws to rotate radially along the core of the chuck, and a self-locking structure is provided in the tilting drive mechanism to maintain the tilting posture of the tilting seat.

[0007] The main feature of this invention is that a horizontally positioned trunnion is set on the tilting seat, and the trunnion is rotatably engaged with the bearing seat on the frame. A self-locking structure is set in the tilting drive mechanism that drives the tilting seat to tilt around the trunnion shaft, so that it can maintain the tilting posture of the tilting seat, which facilitates the welding torch to perform welding action on the workpiece clamped on the chuck, and ensures the reliability and stability of the positioner. Attached Figure Description

[0008] Figure 1 This is an isometric view of the positioner;

[0009] Figure 2 A bottom view of the positioner after part of its base has been removed;

[0010] Figure 3 This is a schematic diagram of the positioner after the chuck and part of the frame have been removed.

[0011] Figure 4 , Figure 5 This is a schematic diagram of the tilting seat of the positioner flipping over to the position of the plumb bob. Detailed Implementation

[0012] See Figures 1-5 The positioner shown has a bearing seat 1d on the frame 1 and a trunnion 12 horizontally arranged on the tilting seat 10 in a rotational fit. A chuck 30 is arranged on the seat surface of the tilting seat 10. The core of the chuck 30 is coplanar and perpendicular to the core of the trunnion 12. The workpiece to be processed is constrained and fixed by the radial displacement of the jaws 31 along the surface of the chuck 30. A tilting drive mechanism is provided between the frame 1 and the tilting seat 10 to drive the tilting seat 10 to tilt around the core of the trunnion 12. A rotation drive mechanism is provided between the tilting seat 10 and the chuck 30 to drive the chuck 30 to rotate around its own core. A locking mechanism is provided between the chuck 30 and the jaws 31 to drive the jaws 31 to move radially along the core of the chuck 30. The tilting drive mechanism is provided with a self-locking structure to maintain the tilting posture of the tilting seat 10.

[0013] In the above scheme, the chuck 31, driven by the locking mechanism, can clamp the workpiece to be welded along the radial displacement of the chuck 30's core; the rotation drive mechanism can drive the chuck 30 to rotate around its own core, thereby causing the workpiece to rotate around the core of the chuck 30; the tilting drive mechanism drives the tilting seat 10 to rotate around the trunnion 12's axis, thereby adjusting the angle between the chuck 30's core and the horizontal plane. The positioner can change the posture of the workpiece to be welded through the combination of these three drive mechanisms, allowing the welding torch to reach all welding positions without obstruction. In the event of power failure or control system malfunction, the additional self-locking structure in the tilting drive mechanism can maintain the stable posture of the tilting seat 10, thereby protecting the workpiece and equipment from accidental damage and ensuring the reliability and stability of the positioner's operation.

[0014] More specifically, the tilting drive mechanism includes a tilting motor 21, and the power output shaft of the reducer 22 connected to the tilting motor 21 is a worm 23. The worm wheel 24 meshing with the worm 23 has the same core as the trunnion 12, and the worm wheel 24 is fixedly connected to the tilting seat 10. The lead angle of the worm 23 is smaller than the equivalent friction angle of its meshing pair. In the above scheme, using a worm gear mechanism for transmission can provide a large reduction ratio, making the selection range of the reducer 22 very wide, which is beneficial for selecting a smaller reducer 22 and saving its space. More importantly, since the lead angle of the worm 23 is smaller than the equivalent friction angle of its meshing pair, the worm gear mechanism in this scheme has a self-locking function, does not rely on electricity, has reliable self-locking performance, and does not require an additional self-locking structure.

[0015] Preferably, the worm gear 24 is located on the inner end side of the trunnion 12, and the central angle corresponding to the circumference of the worm gear 24 is greater than 90°. The worm 23 is arranged obliquely, and the tilting motor 21 and the reducer 22 are located at the upper end of the worm 23. The motor shaft of the tilting motor 21 is arranged parallel to the trunnion 12. In the above scheme, in order to avoid interference between the worm gear 24 and the tilting seat 10, a sector gear is selected for the worm gear 24. The central angle corresponding to the circumference of the tooth surface is greater than 90°, which can satisfy the requirement that the disc core direction of the chuck 30 on the tilting seat 10 is at any angle between the horizontal and vertical directions, thus realizing the displacement function of the positioner. In the embodiment shown in the accompanying drawings of this scheme, the central angle corresponding to the circumference of the worm gear 24 is 180°, which makes the meshing space of the worm gear and worm pair more spacious and facilitates the adjustment of the orientation of the worm gear 24 or the worm 23.

[0016] Based on the above, the oblique arrangement of the worm 23 can save the horizontal space occupied by the tilting drive mechanism, and the tilting motor 21 and reducer 22 are mounted at the upper end of the worm 23, which is conducive to heat dissipation. In addition, the oblique arrangement of the worm 23 can also make the effective meshing tooth surface range between the worm 23 and the worm wheel 24 close to the middle of the tooth surface range of the entire circumference of the worm wheel 24, thus avoiding accidental disengagement of the worm wheel and worm meshing pair.

[0017] In order to keep the overall center of gravity of the positioner on the central axis of the tilting seat 10, the tilting seat 10 is provided with a counterweight 14 arranged opposite to the worm gear 24. The worm gear 24 and the counterweight 14 are symmetrically arranged with respect to the center of the tilting seat 10 to avoid the positioner from shaking during operation and affecting the machining accuracy.

[0018] A more preferred embodiment is that the bottom of the tilting base 10 is provided with connecting plates 11 arranged symmetrically to the center of the tilting base 10. The surface of the connecting plates 11 is perpendicular to the tilting base 10. The inner end of the trunnion 12 is connected to the connecting plates 11. A worm gear 24 is connected to the outer surface of the connecting plates 11. A reinforcing plate 13 with its surface perpendicular to the connecting plates 11 is provided between the two connecting plates 11. The center of the reinforcing plate 13 and the center of the tilting base 10 are located in the same vertical plane. The combination of the connecting plates 11 and the reinforcing plate 13 can improve the connection strength between the tilting base 10 and its trunnion 12, and enhance the load-bearing capacity of the tilting base 10, enabling it to bear several tons or even heavier workpieces to be welded.

[0019] To facilitate installation and maintenance, a strip-shaped clearance hole 1a' is provided on the side plate 1a of the frame 1 adjacent to the tilting motor 21 and the reducer 22. The strip-shaped clearance hole 1a' is directly opposite the mounting position of the tilting motor 21 or the reducer 22. Operators can tighten or loosen the mounting nuts on the tilting motor 21 and the reducer 22 through the strip-shaped clearance hole 1a'.

[0020] To reduce wear on the tilting drive mechanism, the frame 1 is equipped with a support plate 1b that avoids the tilting path of the tilting seat 10. A support leg 15 is fixedly connected to the bottom surface of the tilting seat 10. When the tilting seat 10 is tilted to the point where the seat surface is vertical under the drive of the tilting mechanism, the support leg 15 abuts against the corresponding notch 1b' on the support plate 1b. When the tilting seat 10 is tilted to the point where the seat surface is horizontal under the drive of the tilting mechanism, the bottom surface of the tilting seat 10 abuts against the support platform 1c fixed to the frame 1. The support platform 1c and the support plate 1b are positioned on opposite sides of the vertical surface passing through the trunnion 12 shaft. The support plate 1b and the support platform 1c support the tilting seat 10 when the seat surface is at the vertical surface and horizontal surface, respectively. These two postures are located at both ends of the tilting path of the tilting seat 10 and are also the most commonly used postures of the tilting seat 10. The support plates 1b and 1c provide support for the tilting seat 10, ensuring its accuracy and stability in the two postures mentioned above. They also help reduce wear on the tilting drive mechanism and extend its service life.

Claims

1. A positioner, wherein a bearing seat (1d) provided on a frame (1) and a trunnion (12) horizontally provided on a tilting seat (10) form a rotational fit, a chuck (30) is provided on the seat surface of the tilting seat (10), the disk core of the chuck (30) is coplanar and perpendicular to the shaft core of the trunnion (12), and the workpiece to be processed is constrained and fixed by the radial displacement of the disk surface of the chuck (30) by the jaws (31), characterized in that: A tilting drive mechanism is provided between the frame (1) and the tilting seat (10) to drive the tilting seat (10) to tilt around the trunnion (12) shaft core. A rotation drive mechanism is provided between the tilting seat (10) and the chuck (30) to drive the chuck (30) to rotate around its own disk core. A locking mechanism is provided between the chuck (30) and the chuck (31) to drive the chuck (31) to move radially along the disk core of the chuck (30). The tilting drive mechanism is provided with a self-locking structure to maintain the tilting posture of the tilting seat (10).

2. The positioner according to claim 1, characterized in that: The tilting drive mechanism includes a tilting motor (21), and the power output shaft of the reducer (22) connected to the tilting motor (21) is a worm (23). The worm wheel (24) meshing with the worm (23) has the same core as the trunnion (12), and the worm wheel (24) is fixedly connected to the tilting seat (10).

3. The positioner according to claim 2, characterized in that: The worm gear (24) is located on the inner side of the trunnion (12) and the central angle corresponding to the circumference of the worm gear (24) is greater than 90°. The worm (23) is arranged obliquely and the tilting motor (21) and reducer (22) are located at the upper end of the worm (23). The motor shaft of the tilting motor (21) is arranged parallel to the trunnion (12).

4. The positioner according to claim 2, characterized in that: The lead angle of the worm (23) is smaller than the equivalent friction angle of its meshing pair.

5. The positioner according to claim 2, characterized in that: The tilting seat (10) is provided with a counterweight (14) arranged opposite to the worm gear (24), and the worm gear (24) and the counterweight (14) are symmetrically arranged relative to the center of the tilting seat (10).

6. The positioner according to claim 2, characterized in that: The bottom of the tilting seat (10) is provided with a connecting plate (11) symmetrically arranged relative to the center of the tilting seat (10). The plate surface of the connecting plate (11) is perpendicular to the tilting seat (10). The inner end of the trunnion (12) is connected to the connecting plate (11). A worm gear (24) is connected to the outer plate surface of the connecting plate (11). A reinforcing plate (13) with a plate surface perpendicular to the connecting plate (11) is provided between the two connecting plates (11). The center of the reinforcing plate (13) and the center of the tilting seat (10) are located in the same vertical plane.

7. The positioner according to claim 1, characterized in that: A strip-shaped clearance hole (1a') is provided on the side plate (1a) of the frame (1) adjacent to the tilting motor (21) and the reducer (22), and the strip-shaped clearance hole (1a') is directly opposite the mounting position of the tilting motor (21) or the reducer (22).

8. The positioner according to claim 1, characterized in that: The frame (1) is provided with a support plate (1b) that avoids the tilting path of the tilting seat (10). The bottom surface of the tilting seat (10) is fixedly connected with a support leg (15). When the tilting seat (10) is tilted to the bottom of the seat surface by the driving mechanism, the support leg (15) abuts against the bottom of the corresponding notch (1b') on the support plate (1b). When the tilting seat (10) is tilted to the bottom of the seat surface by the driving mechanism, the bottom surface of the tilting seat (10) abuts against the support platform (1c) fixed on the frame (1). The support platform (1c) and the support plate (1b) are respectively placed on both sides of the bottom of the bottom surface of the trunnion (12) shaft.

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