JPH039907Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a positioner that holds a workpiece at a desired angular position during welding work, and allows the workpiece to be quickly rotated to any desired angular position by manual operation. The purpose of the present invention is to provide a positioner that can be held in place.

[Prior Art] When welding mechanical structures, it is common practice to hold the workpiece with a positioner so that downward welding is always performed in order to improve workability and the strength of the welded part.

The positioner has the function of holding the workpiece at a free angular position, and the mounting seat for fixing the workpiece is rotated between the first rotation axis and the second rotation axis, which are substantially orthogonal to each other.
It has a structure in which the workpiece can be rotated freely around an axis and fixed at a desired rotational position, and the workpiece can be swung to align the center of gravity of the workpiece with the axis of the first rotational axis or the second rotational axis. Positioners equipped with moving arms are also known. In the conventional positioner, the mounting seat is rotated about the first rotation axis and the second rotation axis using a brake motor or the like.

[Problems to be solved by the invention] However, with conventional positioners that rotate the mounting seat using a motor, there was a problem in that it took time to rotate and position the workpiece, reducing the efficiency of welding work. Additionally, if the mounting seat is moved to align the center of gravity of the workpiece with the axis of the rotating shaft, the angle of the mounting seat will also change and the angle of the workpiece cannot be kept constant, resulting in poor workability during welding. There was also the problem that it was difficult to balance the workpiece.

This idea makes it easier to balance the attached workpiece, allows the workpiece to be moved to the optimal working height without changing the workpiece angle, and allows the angular position of the workpiece to be quickly set manually. The purpose is to obtain a positioner with a structure that can be used.

[Means for Solving the Problems] In the positioner of this invention, the arm for swinging the mounting seat is constituted by a parallel link, and a pantograph mechanism for raising and lowering the support frame is provided. That is, to explain using the reference numerals of the illustrated embodiments, the positioner of this invention has a first rotation shaft 4 rotatably mounted on the support frame 2 and fixed at a desired rotation position.
The bracket 7 fixed to the bracket 7 and the support block 11 that pivotally supports the mounting seat 8 are pivotally connected by an arm 12 composed of parallel links 81 and 82, and the arm and the bracket 7 are connected by a telescopic support rod 13. By pivotally connecting the arm 12 to swing the arm 12 and holding it fixed at a desired position, and by attaching the support frame 2 to the base 1 via the pandagraph mechanism 3, the support frame 2, that is, the first rotation The shaft 4 can be moved up and down.

[Function] The workpiece 9 to be welded is fixed to the mounting seat 8 via a suitable jig 14, which allows the center of gravity G of the workpiece 9 to be aligned with the second rotation axis 10 that is integral with the mounting seat. so that it is on the axis of the Then, by extending or retracting the support rod 13, the center of gravity G of the workpiece 9 is placed on the axis of the first rotating shaft 4, and the lifting drive device 51 connected to the pantograph mechanism 3 is operated. Move the work 9 to an appropriate working height.

Then, by manually rotating the workpiece 9 around the first rotational axis 4 and the second rotational axis 10, the workpiece is brought into a desired posture, and the brake devices 21 and 27 provided on the rotational axes 4 and 10 are activated. Welding work is performed with the rotation of the shafts 4 and 10 fixed.

In the device of this invention, the support block 11 that pivotally supports the mounting seat 8 and the bracket 7 fixed to the first rotating shaft 4 are connected by a parallel link mechanism, so even if the arm 12 is swung, the mounting can be performed. The angle of the seat 8 does not change, so the center of gravity G of the workpiece 9 is
It is easy to match the axis of the rotating shaft 4, making it easy to balance the workpiece, and the workpiece 9 can be manually rotated easily and quickly to take a desired posture in a perfectly balanced state. In addition, since the position of the workpiece 9 can be adjusted to the optimal working height by raising and lowering the support frame 2, the welding work can be performed in a good posture, improving work efficiency and reducing worker fatigue. be able to.

[Embodiment] Fig. 1 is a diagram showing an embodiment of this invention, in which 1 is a base, 2 is a support frame, 3 is a pandagraph mechanism that supports the support frame 2 on the base 1, and 4 is a support frame. 2 is a first rotating shaft supported by bearings 5 and 6, 7 is a bracket fixed to the first rotating shaft 4, 8 is a mounting seat for a workpiece 9, and 10 is a second shaft integrated with the mounting seat. 11 is a support block that pivotally supports the second rotating shaft 10; 12 is an arm that connects the bracket 7 and the support block 11; and 13 is a support rod that supports the arm 12 at a desired swing position.

31 to 34 are links forming the pandagraph mechanism 3, 35 is a pin that pivotally connects the tips of the links 31 and 33, and 36 is the link 32 and 3.
4, a pin 37 pivotally connects the centers of the links 31 and 32, and 38 a pin that pivotally connects the centers of the links 33 and 34. The base end of the link 31 is pivotally supported on the base 1, and the base end of the link 33 is pivotally supported on the support frame 2 by pins 39 and 40, respectively.Rollers 41 and 42 are pivoted on the base ends of the links 32 and 34, respectively. and is movable along the base 1 and the support frame 2. Guide frames 43 and 44 prevent the rollers 41 and 42 from floating up.

Reference numeral 51 denotes a jack installed between the pin 36 and the base 1. By operating the plunger 53 of the pump 52, the jack 51 is expanded and the support frame 2 is extended.
It increases the Pump plunger 5
3, as shown in FIG. 4, a foot pedal 58 is operated via two seesaw levers 56 and 57 that swing around fulcrum pins 54 and 55 set on a stationary member.
The structure is such that the support frame 2 can be raised by the operator stepping on the foot pedal 58. Here seesaw levers 56 and 57
are engaged with each other by an engagement pair consisting of an engagement rod 59 and a fork 60.

21 is a block brake that fixes the rotation of the first rotating shaft 4, and 22 is a handle that tightens the brake piece of the brake. 23 is a toothed disc fixed to the first rotating shaft 4; 24 is an engagement lever pivotally supported on the support frame 2 by a pin 25; Depending on the case, the first rotation axis 4
It has a structure that allows it to be locked. Shown with imaginary line 2
6 is a cover covering these devices.

The workpiece 9 is fixed to the mounting seat 8 via a mounting jig 14 with bolts or the like. 27 is the second rotation axis 1
28 is a handle that tightens the brake pieces 27a and 27b. The support block 11 consists of a main body 71 and a tilting plate 72, and as shown in FIGS. 2 and 3, by tilting the main body 71 with respect to the tilting plate 72, the work 9 can be supported in an inclined state as desired. It has a structure. Here, 73 is a tilting plate 72
74 is a circular hole formed in the main body 71, 75 is a bolt that passes through the circular hole 73 and is screwed into the main body 71. By tightening the bolt 75, the tilting position of the main body 71 is fixed. It is a structure.

The arm 12 has two parallel links 81 and 82.
The base ends of the links 81 and 82 are connected to the pin 8.
3 and 84, and the tips of the links 81 and 82 are pivotally connected to the tilting plate 72 through pins 85 and 86. Note that the pin 86 passes through the arcuate hole 74 described above.

The support rod 13 has a turnbuckle 87 in the center.
The base end is pivotally connected to the tip of the bracket 7 by a pin 88, and the tip is pivotally connected to the bracket 90 fixed to the link 82 by a pin 89. Therefore, by rotating the turnbuckle 87, the arm 12 can be swung around the pins 83, 84, and the center of gravity G of the workpiece 9 can be aligned with the axis of the first rotation shaft 4. On the other hand, the jig 14 is manufactured to match the workpiece so that the center of gravity G of the workpiece 9 is aligned with the axis of the second rotation shaft 10.
By mounting the workpiece 9 on the mounting seat 8 via the workpiece 9 , the center of gravity of the workpiece 9 automatically aligns with the axis of the second rotating shaft 10 .

By aligning the center of gravity G of the workpiece 9 with the axes of the first and second rotation axes 4 and 10 in this way, the workpiece 9 can be moved around the axes of the first and second rotation axes 4 and 10. Can be held in any position, weight is 500
If the workpiece weighs up to about 1 kg, the operator can manually rotate the workpiece 9 to point it in any direction. Then, the handles 22 and 28 are tightened to fix the direction of the workpiece 9, the foot pedal 58 is operated to raise the workpiece 9 to an appropriate working height, and the workpiece 9 is welded.

[Effects of the invention] According to the positioner of this invention, it is possible to easily attach a workpiece in a well-balanced manner, and it is also possible to quickly rotate the workpiece manually to a desired angular position, improving the efficiency of welding work. will improve. Furthermore, since the height of the workpiece can be easily set to a desired working height, welding work can be performed in an optimal working posture, reducing worker fatigue and improving the working environment. Furthermore, since a motor or other drive source for rotating and positioning the workpiece is not required, the device is inexpensive, and there is no need for power supply equipment or wiring, making it extremely economical.

[Brief explanation of the drawing]

The figure shows an embodiment of this invention. Figure 1 is a side view of the entire device, Figures 2 and 3 are side views showing the structure and operation of the workpiece mounting seat, and Figure 4 is a panda. FIG. 2 is a perspective view showing a lifting device of a graph mechanism. In the figure, 1...base, 2...support frame, 3...panda graph mechanism, 4...first rotation axis, 7...bracket, 8...
Mounting seat, 9...workpiece, 10...second rotation axis, 11...
Support block, 12... Arm, 13... Support rod, 14... Mounting jig, 21, 27... Block brake, 51... Jack, 81, 82... Link, 8
7... Turnbuckle, G... Center of gravity of the workpiece.

Claims (1)

[Scope of utility model registration request] An arm is swingably attached to a first rotation shaft which is attached to a support frame so as to be rotatable and fixable at a desired rotation position, and a mounting seat for fixing a workpiece to the tip of the arm is attached to the first rotation shaft. The arm is rotatably mounted around a second rotation axis substantially orthogonal to the moving axis and fixed at a desired rotation position, and the arm is composed of two parallel links, with both ends of each link It is pivotally connected to a bracket fixed to the first rotation shaft and a support block that pivotally supports the second rotation shaft, and includes a telescoping support rod whose both ends are pivotally connected to the arm and the bracket, A positioner for welding work, in which the support frame is attached to a base via a pantograph mechanism and can be raised and lowered freely, and is equipped with an elevating device that raises and lowers the support frame and maintains the stopped position.