JPS6047013B2 - stretcher leveler - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention includes a pair of gripping devices that are arranged opposite to each other to grip both ends of a metal material, and a biasing device that can bias both gripping devices in a direction to separate them from each other. This invention relates to a stretcher leveler equipped with.

Some stretcher levelers apply tension to metal materials, especially high-strength aluminum alloys, etc. to remove internal stress. Occasionally, metal materials may break.

At the time of this breakage, a large impact load was applied to the stretcher leveler, and there was a risk that various parts of the stretcher leveler would be damaged. In the conventional stretch leveler, the biasing device includes a rod-shaped compression member having one end fixed, and a hydraulic cylinder provided at the other end of the rod-shaped compression member.
One gripping device is connected to this hydraulic cylinder, and another gripping device is connected to the one end of the compression member.In order to absorb the impact load when the metal material breaks, the hydraulic pressure of the hydraulic cylinder is The system was equipped with a relief valve.

However, the response speed of the relief valve is 0.1 to 0.2 [s
ec] was the limit, sufficient impact load absorption performance could not be obtained, and damage to various parts could not be completely prevented. The present invention was devised to solve these conventional problems, and an object of the present invention is to provide a stretcher leveler that is sufficiently protected against impact loads when metal materials break.

The stretch leveler according to the present invention includes fluid pressure cylinders that are pressurized by movement of both ends of the biasing device in the biasing direction, at both ends of the biasing device in the metallic material biasing direction, and Converts the impact load at the time of material breakage into pressure within a fluid pressure cylinder, connects an accumulator to the fluid pressure cylinder, temporarily absorbs the energy of the pressure within the fluid pressure cylinder in the accumulator, and then gradually releases it. It is something.

Next, an embodiment of the stretcher leveler according to the present invention will be described based on the drawings.

In the drawing, the stretcher leveler is equipped with a head stock grip head 1 and a tail stock grip head 2 as a gripping device for gripping metal materials, and these grip heads 1 and 2 are opposed to each other on a rail 3. It is arranged so that it can be moved freely.

A biasing device 4 extending along a rail 3 is provided on both sides of the grip heads 1 and 2, and the tail side end of the biasing device 4 is connected to a platform 5 fixed to the floor via a hydraulic cylinder 6. are connected. The biasing device 4 includes a rod-shaped compression member 7 and this compression member 7.
The grip head 1 is fixed to the hydraulic cylinder 8, and the grip head 1 is fixed to the hydraulic cylinder 8.

The grip head 2 is movable relative to the compression member 7 and has a tail stock lock pin 9 which is raised and lowered by a hydraulic cylinder 31 in order to fix itself to the compression member 7.
A plurality of insertion holes 10 for inserting lock pins 9 are arranged in the longitudinal direction of the compression member 7. grip head 2
A manipulator cylinder 11 is located behind the
The manipulator cylinder 11 is fixed to the compression member 7 by a manipulator lock pin 12. The grip head 2 is moved according to the length of the metal material to which tension is to be applied, and the distance between the grip heads 1 and 2 is such that both ends of the metal material can be appropriately gripped by the grip heads 1 and 2. It is set so that it can be grasped instead. During this movement, the lock pin 9 must be inserted into the insertion hole 1.
0, and the grip head 2 is moved by the manipulator cylinder 11. On the other hand, the hydraulic cylinder 8 is a telescopic cylinder consisting of a manipulator cylinder 13 and a main cylinder 14, and a piston rod 15 is fitted into the manipulator cylinder 13.
hydraulic. A hydraulic cylinder 16 is installed at the head side end of the cylinder 8.
is fixed, and one end of the piston rod 15 is fitted into the hydraulic cylinder 16. When the hydraulic pressure of the manipulator cylinder 13 is controlled, the piston rod 15 moves relative to the manipulator cylinder 13 to push or index the hydraulic cylinder 16, and as a result, the grip head 1 moves together with the main cylinder 14. to change the distance between the grip heads 1 and 2. Therefore, the distance between the grip heads 1 and 2 is the same as that of the manipulator cylinder 1.
1 and 13. When applying tension to the metal material, the hydraulic pressure inside the main cylinder 14 is increased, and the main cylinder 14 is pushed out toward the head side end surface with respect to the manipulator cylinder 13, and the grip head 1
, 2 are applied with a biasing force in the direction of separating them from each other.

Compression member 7 when applying tension to metal materials
Compressive stress is generated in the metal material, and when the metal material breaks, this compressive stress is released all at once, and both ends of the biasing device 4 rapidly move in the direction in which they are separated from each other, that is, in the biasing direction of the biasing device 4. do.

Hydraulic cylinders 6 and 16 are used to absorb the shock of this movement.
An accumulator 22 is connected to each.
Since the relationship between each hydraulic cylinder 6, 16 and the accumulator 22 is the same, only the accumulator 22 for the hydraulic cylinder 6 will be described here.

The accumulator 22 has an opening 23 communicating with the hydraulic cylinder 6, and this opening 23 is closed by a valve 24 inside the accumulator 22.

The valve 24 is biased toward the opening 23 by a spring 25, and the valve 24 is also connected to the opening 23 and the accumulator 2.
A small hole 26 communicating with the inside of 2 is bored. When both ends of the biasing device 4 are moved, the pressure in the hydraulic cylinder 6 increases rapidly, and this pressure pushes the valve 24 away, so that the pressure in the hydraulic cylinder 6 is introduced into the accumulator 22 very quickly. be done.

The accumulator 22 is filled with oil 27 and an inert gas 28, and the inert gas 28 is compressed by the hydraulic pressure introduced into the accumulator 22, so that energy can be absorbed. After such energy is absorbed, the pressure inside the hydraulic cylinder 6 drops, and the pressure of the inert gas 28 inside the accumulator 22 causes the oil 27 to drop.
passes through the small hole 26 and gradually flows into the hydraulic cylinder 6, so that the biasing device 4 returns to its original state. Inside the accumulator 22, the pressure energy of the oil 27 is partially converted into thermal energy, so the temperature of the oil 27 and the inert gas 28 increases, but there is no risk that the inert gas 28 will explode or combine with the oil 27. Therefore, sufficient safety is ensured. Furthermore, the inert gas 28 also functions to prevent deterioration of the oil 28, allowing the oil 28 to be used for a long period of time. A rupture disk 29 and a silencer 30 are connected in series to the accumulator 22, and when the pressure inside the accumulator 22 increases abnormally, the inert gas 28 is discharged from the silencer 30 while destroying the rupture disk 29. Ru.

At this time, the pressure within the hydraulic cylinder 6 is also released, so the accumulator 22 acts as a damper against abnormal pressure increases, and its safety is also ensured. Under normal conditions, the accumulator 22 is pressurized to an appropriate pressure and can generate sufficient reaction force against the driving force for moving the grip heads 1 and 2. Problems such as a decrease in accuracy do not occur.

As mentioned above, the stretcher leveler according to the present invention has the following features:
Fluid pressure cylinders are provided at both ends of the biasing device in the direction in which the metal material is biased, and are pressurized by the movement of both ends of the biasing device in the biasing direction. By connecting an accumulator to the fluid pressure cylinder, the pressure energy in the fluid pressure cylinder is stored in the accumulator and gradually released, so it can withstand impact loads when metal materials break. It has the excellent effect of providing sufficient protection.

It should be noted that the present invention is not limited to the above-mentioned embodiment, and the following modifications are possible.

i. A configuration in which another structure, such as a ball valve, that opens when the pressure within the fluid pressure cylinder increases to a predetermined value or more is adopted as the valve 24.

11 without providing the small hole 26 in the valve 24, the opening 23
or a completely separate bypass route.

■ A configuration in which the manipulator cylinder 13 is provided not only at one end of the compression member 7 but also at both ends.

Iv A configuration in which a fluid other than oil is used as the working fluid of the cylinder in the embodiment.

[Brief explanation of drawings]

The drawing is a conceptual diagram showing an enlarged main part of an embodiment of the stretcher leveler according to the present invention. 1...Headstock grip head, 2...
・Tail stock grip head, 3...rule, 4...biasing device, 5...platform, 6...hydraulic cylinder, 7... Compression member, 8... Hydraulic cylinder,
9...Tail stock lock pin, 10...
...Insertion hole, 11...Manipulator cylinder, 12...Manipulator lock pin, 13...
... Manipulator cylinder, 14 ... Main cylinder, 15 ... Piston rod, 16.
...Hydraulic cylinder, 17...Recess, 18
... Grip jaw, 19 ... Grip cylinder, 20 ... Ring spring, 21 ... Bumper, 22 ... Accumulator, 23 ...
Opening, 24... Valve, 25... Spring,
26...small hole, 27...oil, 28...
... Inert gas, 29 ... Rapture disk, 30 ... Silencer, 31 ... Hydraulic cylinder.

Claims (1)

[Claims] 1. A stretcher leveler equipped with a pair of gripping devices disposed opposite to each other to grip both ends of a metal material, and a biasing device capable of biasing both gripping devices in a direction to move them apart. Fluid pressure cylinders that are pressurized by movement of both ends of the biasing device in the biasing direction are provided at both ends of the biasing device in the biasing direction, and an accumulator is connected to each fluid pressure cylinder. , the opening communicating with the fluid pressure cylinder of the accumulator is closed by a valve that opens when the pressure within the fluid pressure cylinder increases to a predetermined value or more, and the accumulator and the fluid pressure cylinder are further communicated through a small hole. A stretch leveler characterized by: