JPH05139685A - Gripper for shape steel - Google Patents

Abstract

PURPOSE:To provide a gripper which does not have to depend on the strong pressure of a cylinder for each holding arm when dissimilar shape steels to which unbalanced loads are applied are held by the right and left holding arms. CONSTITUTION:Of first and second holding arms 7, 8 being coupled together by a connecting link 18, the first holding arm 7 has a lever 25 fitted therein at its pivot 16, the lever 25 being inclined in the positive and negative directions by a lever inclination means 26; a pin 30 which abuts on the positively inclined surface of the lever to incline the second holding arm to release the arm and a set bolt 31 which abuts on the negatively inclined lower surface of the lever are mounted to the respective portions of the second holding arm 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gripper device for sandwiching a steel mold from the left and right by a pair of clamping arms.

[0002]

2. Description of the Related Art FIG. 5 shows a transfer device for holding a model steel at a certain position in a factory, lifting it and transferring it to another place. A slender elevating member 3 is attached to a traveling carriage 2 capable of traveling along a beam 1 extending in the lateral direction so that the elongating elevating member 3 can be moved up and down. The gripper device A is attached to the lower end of the elevating member 3. The steel material B to be conveyed is clamped by the pair of clamping arms 7 and 8 of the gripper device A.

When the sectional shape of the steel mold B is symmetrical,
Although both clamping arms 7 and 8 are not subjected to eccentric loads, when the shape steel B is a laterally asymmetrical deformed shape steel as shown in the figure, eccentric loads act and the clamping arms 7 and 8 are caused by the eccentric loads.
There was a risk of expanding the. As a preventive measure, conventionally, it has been solved by increasing the operating pressure of each cylinder that opens and closes the left and right holding arms 7 and 8.

[0004]

As described above, the solution using two cylinders and having a powerful working pressure generator causes increase in equipment cost, and is not a very good solution. I don't like it.

The problem to be solved by the present invention is to provide a gripper device capable of preventing the clamping arm from loosening due to an eccentric load without using a single cylinder and increasing the operating pressure of the cylinder to make it stronger. To do.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a gripper device which is mounted on the lower end of an elevating member and clamps a shaped steel by a pair of clamping arms. The movable member is provided, and the first and second holding arms coupled to the movable member by the connecting link are pivotally attached. Then, spring means for rotating only the first holding arm in the direction of holding is provided, and a lever is rotatably pivotally attached to a pivot of the first holding arm, and a steel plate pressing plate is attached in the middle of the lever. Further, there is provided a lever tilt moving means for tilting the lever to a positive tilt and a negative tilt. On the second clamping arm, a pin for abutting the upper surface of the lever having the positive inclination to incline the second clamping arm to a released state and a mounting bracket screwed with a set bolt for abutting the lower surface of the lever having the negative inclination. Decided to install each.

[0007]

[Operation] When the second gripping arm is tilted to the released state by the positively tilted lever, the spring means is attached to the first gripping arm via the connecting link connecting the first and second gripping arms. The first clamping arm tilts to the released state due to the addition of a tensile force against the force due to.

Then, the pressing plate for the mold steel is lowered until it hits the upper surface of the mold steel, and then the lever tilting means causes the lever to tilt to a negative tilt, which is the reverse of the previous tilt. And the second both clamping arms rotate to clamp the shaped steel. At this time, the head of the set bolt contacts the lower end surface of the lever.

When the clamped mold steel is lifted, even if an attempt is made to expand the first and second clamp arms by the eccentric load of the mold steel, the head of the set bolt contacts the lower surface of the lever, and therefore the lever tilting means. In this case, the lever must be pushed up against each other, and further the spring means and the pressing force of the pressing plate boosted by the principle of leverage must be resisted via the connecting link, which is actually very difficult. There is no slack in the clamped state due to the eccentric load.

[0010]

EXAMPLE As shown in FIG. 5, the gripper device according to the present invention is attached to the lower end of the elevating member 3, and the first and second gripper devices are attached.
The model steel B is clamped by the pair of clamping arms 7 and 8. The details thereof will be described below with reference to FIGS. 1 to 4.

Reference numeral 9 denotes a cylindrical body attached to the elevating member 3,
A spring 10 is installed inside the cylindrical body 9. 11 is a cylinder 9
A shaft body 13 having a stopper 12 attached to the upper end and a base plate 14 fixed to the lower end of the shaft body 13 slidably fitted therein.
And a vertical plate 15 attached to the lower surface of the base plate 14 are movable members. On the vertical plate 15, the pivot 16 of the first holding arm 7 and the pivot 17 of the second holding arm 8 are erected, and
And the second holding arms 7 and 8 are connected by a connecting link 18. In the movable member 11, the spring 10 in the tubular body 9 pushes down the shaft body 13 so that the stopper 12 normally contacts the upper end surface of the tubular body 9 (see FIG. 1). By compressing the spring 10, the stopper 12 is separated from the upper end surface of the cylindrical body 9 (see FIG. 2).

In the figure, only the first holding arm 7 is provided with spring means 19 for rotating it in the holding direction which is clockwise. The spring means 19 has a support shaft 20 erected on the first holding arm 7 in order to pivotally connect the above-mentioned connecting link 18, and a spring 21 locked at the tip of the support shaft 20. The base plate 14 for fixing the other end of the spring 21
And a bolt 23 screwed onto the mounting base 22. On the pivot 16 of the first holding arm 7, a lever 25 having a die steel pressing plate 24 mounted in the middle is pivotally mounted (see FIG. 3).

Lever tilting means 26 comprising a piston rod 28 of a cylinder 27 connected to the other end of the lever 25 and a cylinder mount 29 mounted on the base plate 14 for rotatably holding the cylinder 27. Shows the lever 25 in the slanted upper left direction (positive inclination) with the piston rod 28 retracted as shown in FIG. 1, and the slanted lower left direction (negative inclination) with the piston rod 28 extended as shown in FIG. Direct to.

On the second holding arm 8 pivotally attached to the other pivot 17 described above, the lever 2 having the positive inclination is attached.
5, a pin 30 for contacting the upper surface of the second holding arm 8 and tilting the second holding arm 8 in a released state, and a mounting bracket 32 for screwing a set bolt 31 for contacting the lower surface of the lever 25 having the negative inclination are attached. This set bolt 31 is used for the lever 2 in the state shown in FIG.
The lower surface of 5 is set so as to contact the head of the set bolt 31.

In the figure, 33 is a spindle provided on the die steel pressing plate 24, and 34 is two guides (see FIG. 4) provided on the vertical plate 15 for slidably fitting the die steel pressing plate 24. is there.

Next, the operation will be described.

When the lever 25 has a positive inclination, the lever 2
When the pin 30 is pushed on the upper surface of the second pin 5,
It rotates clockwise about 7 to bring the lower end holding portion into the released state as shown in FIG. At this time, the first holding arm 7 coupled to the second holding arm 8 via the connecting link 18 is the spring means 1.
9 is pulled against the force of the spring 21 and is rotated counterclockwise around the pivot 16 to bring the lower end holding portion into the released state as shown in FIG.

The grip device A is lowered while the first and second holding arms 7 and 8 are open, and stopped when the shape steel pressing plate 24 abuts on the upper end surface of the shape steel B. Even if the descent continues for a while until it completely stops due to inertia or the like, there is no problem merely by compressing the spring 10 and pushing up the grip device A. Then, when the cylinder 27 is operated to extend the piston rod 28, the lever 25 is gradually changed from the inclination in the upper left direction to the inclination in the lower left direction, and the pressing plate 24 attached to the lever 25 moves downward accordingly. Since the lower end surface of the pressing plate 24 is already in contact with the upper surface of the shape steel B, the pressing plate 2
Grip device A by compressing spring 10 by the amount equivalent to 4
Raise the whole. On the other hand, the return force of the spring 21 causes the lower end holding portions of the first and second holding arms 7 and 8 to rotate so as to narrow the opening distance, and the holding state as shown in FIG. The end surface comes into contact with the head of the set bolt 31.

When the gripping device A is lifted in this sandwiched state, the head of the set bolt 31 is in contact with the lower surface of the lever 25, so that the lever inclining means 26 must be moved to open the sandwiching arms 7 and 8. It must be carried out against each other, and the spring means 19 and the lever 25 are attached to the middle of the lever 25 through the connecting link 18 to counteract the pressing force of the die steel pressing plate 24 boosted by the lever principle. It has to be done, which is very difficult in practice. Therefore, the eccentric load can prevent the clamped state from being loosened.

[0020]

As described above, according to the present invention, the two holding arms connected by the connecting link are opened and closed by the tilting movement of the lever. Therefore, only one cylinder is used as the lever tilting movement means. Good. Even if a spring means for rotating the holding arm in the holding direction is provided, it is sufficient to provide it on either one of the holding arms. Moreover, with a simple structure in which one of the clamping arms is provided with a mounting bracket screwed with a set bolt that abuts against the negatively inclined lever lower surface, the force of the lever inclining means can be used for preventing the clamping state from loosening. Further, since the shape steel pressing plate is attached in the middle of the lever, the pressing force of the shape steel pressing plate boosted by the lever principle can be applied to the upper surface of the shape steel. By combining the above effects, it is possible to surely prevent the clamping arm from loosening due to the eccentric load without increasing the operating pressure of the lever inclining means to make it stronger.

[Brief description of drawings]

FIG. 1 is a side view showing a released state of a model steel gripper device according to the present invention.

FIG. 2 is a side view showing a sandwiched state of the model steel gripper device of FIG.

FIG. 3 is a right side view of FIG. 1 with a partial cross section.

FIG. 4 is a cross-sectional view showing a mutual relationship in a cross section taken along a substantial center of FIG.

FIG. 5 is a side view showing an example of a transfer device using the shape steel gripper device according to the present invention.

[Explanation of symbols]

 A ... Gripper device B ... Shape steel 3 ... Elevating member 3 7 ... 1st clamping arm 8 ... 2nd clamping arm 9 ... Cylindrical body 10 ... Spring 11 ... Movable member 16 ... 1st clamping arm pivot 18 ... Connection link 19 ... Spring means 24 ... Press plate for type steel 25 ... Lever 26 ... Lever tilt moving means 30 ... Pin 31 ... Set bolt 32 ... Mounting bracket

Claims (1)

[Claims] 1. A first and a second mounted to the lower end of the lifting member 3.
In the gripper device A for sandwiching the shaped steel B by the sandwiching arms 7 and 8, a movable member 11 which is elastically pressed downward by a spring 10 provided in a tubular body 9 provided at the lower end of the elevating member 3 is provided.
The first and second holding arms 7 and 8 connected to the movable member 11 by a connecting link 18 are rotatably and pivotally attached, and
The holding arm 7 is provided with spring means 19 for rotating the first holding arm 7 in a direction to hold the first holding arm 7, and the pivot 16 of the first holding arm 7 is provided with a steel plate pressing plate 24 in the middle thereof. 25
Is rotatably pivoted, and lever tilting means 26 for tilting the lever 25 to a positive tilt and a negative tilt is provided, and the second holding arm 8 is in contact with the upper surface of the lever 25 having the positive tilt. A gripper for a steel mold, characterized in that a pin 30 for contacting and tilting the second holding arm 8 to an open state and a mounting bracket 32 screwed with a set bolt 31 for abutting the lower surface of the lever 25 having the negative tilt are attached. apparatus.