JPS6027525Y2 - Uncoiler rotating device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an uncoiler rotating device having a hydraulic circuit for applying back tension to the uncoiler.

The conventional uncoiler back tension device uses a mechanical brake such as a disc brake or shoe brake, and has the following drawbacks.

1 is easy to wear and requires maintenance, 2 is difficult to adjust the back tension, 3 is difficult to change the braking force when the leveler is pulling and when stopping, 4 has more parts and increases reliability. It's difficult.

In order to eliminate these drawbacks, the present invention aims to provide an uncoiler rotating device in which a hydraulic motor is used to rotate the uncoiler, and a back tension is applied to the uncoiler by the hydraulic circuit.

To explain the drawings of one embodiment of the present invention, FIG. 1 shows rotation from a hydraulic motor 1 to a main shaft 5 for rotating an uncoiler drum via a rotation transmission device 4 including a coupling 2, a speed reducer 3, a chain sprocket, etc. FIG. 2 is a detailed diagram of the hydraulic circuit connected to the hydraulic motor 1.

FIG. 3 shows a simplified diagram of the coil material supply line to the press.

To explain this hydraulic circuit with reference to FIG. 2, the hydraulic motor L'? is provided for driving the uncoiler main shaft. [Magnetic valve 12, check valve with pilot 13a, 13b, flow adjustment valve 14a, 1
4b, forward/reverse operation switching circuit 15, brake valve 7
- Consists of four parts: a strong/weak brake switching circuit 16 consisting of a solenoid valve 6 and a relief valve 8, and a cavitation prevention circuit 11 consisting of a solenoid valve 9 and a pressure reducing valve 10.

A brake valve is a combination of one relief valve and four check valves, and is mainly used in hydraulic motor circuits to prevent overloads during acceleration and deceleration and to reduce negative pressure in the circuit. This valve prevents the occurrence of leaf pressure, and the leaf pressure can be unloaded by opening the vent port 7a.

Next, the operation of this circuit will be explained.

When the uncoiler is to be driven, C or d of the solenoid valve 12 is energized.

When operating in the C side with full forward rotation, the supplied pressure oil is P and B.

It passes through 13b and 14b and reaches boat F of hydraulic motor 1.
rotates in the normal rotation direction (arrow f).

In this case, the solenoid valve 6 is in the 1-way state and the vent port 7a is closed, so the supplied hydraulic pressure is regulated by the set value of the relief valve 7b.

The oil discharged from the hydraulic motor 1 passes through 14a from port E, passes through check valve 113a opened by pilot pressure from supply side circuit B, and ports A and R, and returns to tank T.

When the solenoid valve 12 is turned off to stop, 1 and 2 become in the state shown in the figure.
3a is also closed.

At this time, if the main shaft overruns due to the inertia of the coils, etc., the oil flows back into the tank from 7c and 7b, so the oil pressure on the E side rises and acts as a brake against overrun, stopping the main shaft smoothly.

When reversing, if the d side of 12 is excited, 1 rotates in the E direction, and the circuit works in exactly the same way.

Next, during operation of the press, the anchor and filler are not driven, and the leveler 19 always supplies material within a certain range so that it is within loop control.

When the leveler 19 pulls out the operating coil material, the main shaft 5 of the uncoiler and, in turn, the hydraulic motor 1 are rotated in the forward rotation direction, and therefore the hydraulic motor 1 acts as a pump and sucks oil from port F. , discharges to port E.

Since the solenoid valve 12 is open and therefore 13a and 13b are closed, the discharged oil flows from 7ct 7b to the tank and is increased to the set oil level of 7b, producing a strong braking action.

If the solenoid valve 6 is turned on, the vent port 7a will open and the port 7b will be unloaded, resulting in a set oil pressure of 8, resulting in a weak braking force.

When the driven rotation speeds up to a certain extent, cavitation occurs on the suction side, so cavitation is prevented by supplying a set low pressure oil with the pressure reducing valve 10.

During immediate press operation, when the leveler is operating, solenoid valves 6 and 9 are turned on by one person to supply low-pressure oil to the suction port, and the discharge oil circuit is used as a weak brake force circuit of relief valve 8 to maintain light pack tension. driving with the
At the same time as the leveler stops, both electromagnetic valves are turned off and the discharge circuit is switched to the relief valve 7b to generate strong braking force.

At this time, the greater the inertial force of the driven portion, the higher the generated hydraulic pressure and therefore the greater the braking force.

According to the present invention, pack tension is applied to the uncoiler using a hydraulic circuit that can switch between stronger and weaker brakes by adding a relief valve, making it easy to adjust the back tension strength of the uncoiler instead of using a conventional mechanical system. In the case of brakes, there are advantages such as there are many parts, there is no problem of parts wear, and there is no need for maintenance.

Also, since it has a preload generating circuit, it can follow even if the uncoiler is pulled at high speed by the leveler through the coil material.

Also, the braking force when the uncoiler stops is automatically adjusted depending on the inertia, which is convenient.

[Brief explanation of drawings]

Figure 1 is a simplified diagram of an uncoiler equipped with an embodiment of the present invention, Figure 2 is a hydraulic circuit diagram used in the present invention, and Figure 3 is a simplified diagram of the supply line to the press for coil material, with arrows e and f. indicates the forward and reverse rotation direction. 1 is a hydraulic motor, 2 is a coupling, 3 is a reducer, 4 is a rotation transmission device using a chain sprocket, 5 is a main shaft, 6
is a solenoid valve, 7 is a brake valve, 8 is an IJ IJ-f valve, 9
10 is a solenoid valve, 10 is a pressure reducing valve, 11 is a preload generation circuit, 12 is a solenoid valve, 13 is a check valve with a pilot, 14 is a flow rate adjustment valve, 15 is a forward/reverse switching circuit, 16 is a strong/weak brake switching circuit, 17 is a 18 is an uncoiler, 19 is a leveler, 20 is a feed roll, and 21 is a press.

Claims (1)

[Scope of utility model registration request] In an uncoiler that uses a hydraulic motor to rotate the main shaft in the forward and reverse directions, the hydraulic pressure on the discharge side due to the pump action generated when the coil on the main shaft is pulled by the leveler and the hydraulic motor rotates as a driven rotation is the set pressure of the brake valve. , a brake strength switching circuit that is connected to the vent port of the brake valve and can switch the back tension of the coil between two levels of strength and weakness by switching between the set pressure of the relief valve set to a lower pressure, and the above-mentioned pump action. An uncoiler rotating device characterized by having a low-pressure oil supply circuit to prevent cavitation that may occur on the suction side.