JPH0324305Y2 - - Google Patents

Description

[Detailed description of the invention] Industrial field of application This invention relates to a positioner that supports a workpiece.

Prior Art When a workpiece is directly processed by a worker himself, for example, in welding work, if the workpiece is heavy and the welding work is difficult if the workpiece is placed on the floor. Usually, the work is carried out by placing the workpiece on a positioner.

There are various types of this positioner, but one example, as shown in Figure 9, is a support frame that is rotatably attached to two left and right posts protruding from the floor, and a turntable is attached to the support frame. ,
The support frame and turntable can be rotated by an electric motor or other means.

In addition, as shown in Figure 10, a sliding body is attached to a post so that it can move up and down, a support frame is attached to this, and the sliding frame is raised and lowered by a jack provided at the top of the post. Sensors are installed on the support frame so that it can move up and down in a horizontal state, and the level is detected to control the operation of the left and right jacks.

In addition to the above-mentioned two methods, there is a structure in which a hydraulic cylinder is used instead of a jack, or a structure in which the support frame is raised and lowered by a winch.

Problems to be solved by the invention In the former positioner, that is, one in which the support frame is pivoted to a shaft fixed to the upper end of the post, the height of the support frame is constant, so the shape of the workpiece or Depending on the work location, the worker may have to climb onto a step stool or crouch down below the workpiece. The worker is on the welding surface,
Work is carried out by holding welding tools such as welding holders, so moving back and forth and left and right on a step stool is not only difficult, but also poses the risk of falling. Even,
Every time the work position changed, the worker had to go up and down the step stool, which resulted in frequent movement, increased fatigue, and decreased work efficiency. When working by bending down below the workpiece, it is difficult to see the work area, and the work is done in an awkward position, which causes a lot of fatigue as mentioned above.
Work efficiency was also poor.

In the latter case, that is, when the support frame can be raised and lowered using a jack or hydraulic cylinder, the perpendicularity, parallelism, etc. between the left and right posts, sliding bodies, and support frame can be maintained accurately.
If various conditions are not met, such as pitch error of the jack and difference in rotational resistance due to the difference in left and right weights, which may cause the synchronized rise to go out of order, it will be difficult for the support frame to move up and down in a horizontal state.If the above conditions are absent, This may lead to bad situations such as the support becoming impossible to move up and down, or the joint between the support and the sliding frame breaking. For this reason, a sensor is installed on the support to check the level, and the level of the support is constantly controlled.However, this sensor also has a complicated sensor structure and is prone to failure, and is susceptible to noise caused by electric welding current. When you get out of sync,
As mentioned above, this causes the joint between the sliding body and the support frame to break.

There is also a method of pulling up the sliding body through a wire rope with a winch instead of a jack, but in this method, the wire rope is wound on a drum, so the welded workpiece does not come into contact with the floor surface by rotating, turning, or descending. If the wire rope becomes loose during winding, it will not fit into the groove of the wire drum the next time it is wound, resulting in random winding. If the winding is irregular, the winding state of the left and right sliding bodies will be unbalanced, causing the wire to be twisted and the joint to be broken as described above. Also,
If the welding arm becomes incomplete, the welding current passes through the strands of the wire, and the generated heat weakens the strength of the wire and may cause it to break. Also,
Welding work was sometimes performed on the underside of the work to be welded, and safety considerations led to larger equipment and higher costs.

The purpose of this invention is to solve the above problems and provide a device that can perform accurate functions in a simple manner.

Means for solving the problem The means of this invention taken to solve the above problem are (i) Two posts on the left and right are provided protruding from the floor surface, a sliding frame is inserted into these posts, and the posts and The gap between the sliding frames can be adjusted, (b) an electric chain block is installed on the top of the post, and the electric chain block allows the sliding frame to be raised and lowered via the chain, and (c) the left and right sliding frames A support frame is connected between the bodies, a shaft is vertically protruded from the center of the support frame, a turntable is rotatably supported on the shaft, and a clamp device attached to the turntable is used to clamp the workpiece. (c) The left and right electric chain blocks are equipped with a switch that allows you to select between simultaneous lifting and lowering and independent lifting.

Function: The height of the workpiece can be freely adjusted during work, and the worker can work at a height that suits his or her posture, reducing fatigue and improving work efficiency. There is no need to use a step stool, so there is no need to worry about falling, and it is easy to move. Even in places where you want to weld the workpiece at a slight angle to the left or right, you can weld by tilting the height of the electric chain block from side to side. It is easy to operate, and since the electric chain block can use commercially available standard products, the cost is low, the structure is simple, the quality is stable, and it is reliable.

Embodiments Hereinafter, embodiments of this invention will be described in detail based on the drawings.

1 is a pair of left and right posts, the lower part of which is fixed to the floor 2, an electric chain block 3 suspended from the upper part, and a U-shaped sliding frame 4 which can be moved up and down in the middle part. It is inserted into. Of the sliding frame 4,
A bracket 5 is fixed to the right side surface of the left sliding frame 4, and the bracket 5 is attached to the right side, that is,
A shaft 6 is provided to protrude inward in the horizontal direction.
On the other hand, a bearing unit 7 is connected to the left side of the sliding frame 4 on the right side with bolts 30. The bearing unit 7 supports the shaft 10 of the support frame 9, and has a slide ball bearing 19 fitted therein.
The support frame 9 is formed into a shape in which the left and right sides are bent at right angles, and a shaft 8 is provided on the right side protruding toward the right.
is fitted into the bearing unit 7, and the left side is fitted into the shaft 6, thereby rotatably supporting the support frame 9. A shaft 10 is provided vertically projecting from the center of the support frame 9, and a turntable 11 is rotatably supported on the shaft 10. Reference numeral 12 denotes an electric motor for operating the turntable 11, which is installed on the support frame 9, and is configured to operate the turntable 11 via a reduction gear 13, which is also installed on the support frame 9, via gears 14 and 15.
A clamp device 17 for fixing the workpiece 16 is installed on the turntable 11.

Reference numeral 18 denotes an electric motor with a speed reducer, which rotates the support frame 9. It is installed on the upper part of the bracket 5. so that the support frame 9 can be rotated.

Reference numeral 22 denotes a chain wheel support, the lower part of which is fixed to the sliding frame 4, and a chain wheel 23 supported internally by a shaft 24. A chain 25 hanging down from the electric chain block 3 is connected to a bracket 26 projecting from the top of the post 1 through the chain wheel 23. A chain 25 hangs down from the top of the post 1 into its interior.

27 is a switch for operating the electric chain blocks 3, which allows the left and right electric chain blocks 3 to be operated simultaneously or separately. That is,
At the top, there is a lever 28 for operating the left and right sides simultaneously or selectively, and below the lever 28 there is a switch 29 for raising and lowering. If you put the lever 28 in the neutral position and press the lift switch 29, the left and right electric chain blocks 3 will operate simultaneously, and if you move the lever 28 to the right and press the lower switch 29, only the right electric chain block 3 will operate. ing.

The present invention is constructed as described above, and when actually operating, for example, when raising the support frame 9, the lever 28 of the switch 27 is set to the neutral position. After that, when the lower switch 29 is pressed, the left and right electric chain blocks 3 operate simultaneously to wind up the chain 25. The sliding frame 5 and the support frame 9 supported by the shafts 6 and 8 rise.
When changing the direction of the workpiece 16 to a direction that is easier to work with, the electric motor 12 is activated. Reducer 1
3. Turntable 11 via gears 14 and 15
rotates around the shaft 10. In addition, the workpiece 16
When changing the vertical inclination, the electric motor 18 is activated. Since the support frame 9 rotates about the shafts 6 and 8 via the gears 19 and 20, the workpiece 16 can be tilted to a desired angle.

When lowering the support frame 9, use the lever 2.
8 in the neutral position and press the lower switch 29.

In this way, not only can the height of the support frame 9 be freely adjusted by operating the electric chain block 3 to a height that is convenient for the operator to work, but also
Rotate the turntable 11 to remove the workpiece 16
The direction of the support frame 9 can be changed freely.
Since the inclination of the workpiece 16 can be freely changed by rotating the workpiece itself, the operator can work in a comfortable state.

The left and right electric chain blocks 3 operate simultaneously and at the same speed when the lever 28 of the switch 27 is placed in the neutral position and the switch 29 is operated.
However, due to long-term use, a difference in synchronization speed may occur between the left and right electric chain blocks 3, or a difference may occur between the left and right due to the contact state between the post 1 and the sliding frame 4, and the support frame 9 may be in a horizontal state. There may be cases where this is not the case. In such a case, if there is no room for angle adjustment at the joints of the sliding frame 4, support frame 9, etc., the sliding frame 4 may not be able to move up and down, or cracks may occur in the joints. However, in order to prevent this from happening, in this invention,
The sliding frame 4 has a U-shaped cross section and is fitted into the post 1 with the outside open, so that it can be tilted inward. Furthermore, a slide ball bearing 19 is used for the bearing at the fitting portion between the shaft 8 and the bearing unit 7 on the right side, so that there is no problem even if the shaft 8 is slightly inclined with respect to the bearing unit 7. If the support frame 9 is tilted in this way, move the lever 28 of the switch 27 to the right or left, press the lower switch 29, and slightly operate the electric chain block 3 on one side. Sliding frame 4
are at the same height, allowing the support frame 9 to be horizontal.

FIG. 8 shows another embodiment of the present invention, in which only one post 1 is provided on one side. A bracket 32 is fixed to the sliding frame 31, and an L-shaped support frame 34 is attached to the front surface of the bracket 32 via a swing rail 33.
Furthermore, a turntable 36 is rotatably supported at the front of the support frame 34 via a vertical shaft 35. Since the support frame 34 is in a cantilever state, the rear part of the sliding frame 31, that is,
A guide roller 37 is provided on the side opposite to the support frame 34 side.
must be attached to prevent the sliding frame 31 from rotating forward.

Effects of the invention As described above, the present invention has a sliding frame connected to a support frame that is moved up and down by an electric chain block, and a workpiece is gripped by a clamping device of a turntable that is rotatably attached to the support frame. I decided to do so. As a result, the horizontal lifting height, rotational position, and left/right tilt of the workpiece can be freely adjusted, and the worker can work at a height that suits his or her posture, reducing fatigue and improving work efficiency. In addition, since the height can be adjusted freely, there is no need to use a step stool, and there is no need to climb up and down while holding welding tools such as the welding surface or welding holder, so you can work stably without worrying about falling. In addition, it is easy to move laterally, causing less fatigue as described above, and improving work efficiency. In addition, since electric chain blocks can use commercially available standard products, they are reliable and durable, do not cost much, are simple in structure, can be made compact as a whole, and are advantageous because they require less installation space. It is. In addition, if the support frame is lowered too far, with the conventional jack type, the force of the jack may force it onto the floor and cause the screws to bend, but with this invention, there is no risk of damage to the parts simply due to the chain loosening. do not have. Further, the present invention is not only used as a welding positioner, but also can be used for assembly work and other work for supporting equipment, so it is versatile and useful.

[Brief explanation of the drawing]

Fig. 1 is a front view of the embodiment of the present invention, Fig. 2 is a sectional view taken along line A-A in Fig. 1, Fig. 3 is an enlarged view of section B in Fig. 1, and Fig. 4 is a front view of the support frame. , FIG. 5 is a sectional view of the bearing unit, FIG. 6 is a front view of the switch, FIG. 7 is an explanatory diagram showing how the chain is attached, FIG. 8 is a front view of another embodiment of the present invention, and FIG. Both FIG. 1 and FIG. 10 are front views of conventional devices. 1... Post, 2... Floor, 3... Electric chain block, 4... Sliding frame, 9... Support frame.

Claims (1)

[Scope of utility model registration request] Two posts on the left and right are installed protruding from the floor surface, a sliding frame is inserted into these posts, and the gap between the posts and the sliding frame can be adjusted.A motorized chain block is installed on top of the posts. The electric chain block allows the sliding frame to be raised and lowered through the chain, and a support frame is connected between the left and right sliding frames, and a shaft is provided vertically protruding from the center of the support frame. A turntable is rotatably supported on the shaft, and the workpiece is gripped by a clamp device attached to the turntable, and the left and right electric chain blocks are equipped with a switch that allows you to select between simultaneous lifting and lowering. A positioner with many things to do.