JPS6135294Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a mandrel expansion/contraction adjustment mechanism for a winding and unwinding machine used in equipment for handling strip steel.

Winding machines before and after the rolling mill in reversible rolling equipment, etc.
Each unwinding machine is not a dedicated machine, but may be a combination that can be used as both a winding machine and an unwinding machine.

The difference between a winder and an unwinder is that when the mandrel is expanded, in a winder the mandrel diameter is the specified coil inner diameter.In an unwinder, the mandrel diameter is larger than the coil inner diameter in order to apply tension to the strip during unwinding. needs to be made larger. As is well known, the mandrel is generally expanded or contracted by moving a wedge shaft in a plurality of segments, so the diameter of the mandrel is changed by adjusting the amount of this movement.

As shown in FIG. 1, the winder or unwinder rotates a hollow shaft 6 by a motor through a coupling 2, a pinion 4 and a gear 5 built into a casing 3, and is attached to the outer periphery of a segment 7. The steel strip is wound by applying rotational force to the coil. The wedge shaft 8 rotates together with the segment 7, and the cylinder 9 that moves the segment 7 in the axial direction also rotates together. High-pressure operating oil is supplied to the cylinder 9 to drive the piston, and the operating oil is supplied via a rotary joint 10.

FIG. 2 shows a combination machine in which the mandrel diameter can be set in two stages. This device includes a small piston 15 connected to a wedge shaft 8 in a cylinder 9, and a t-piston 16 that regulates the stroke of this piston 15.
Rotary joints 10 are connected to cylinders A, B, and C divided by 6 through passages 31, 32, and 33.
It communicates with ports 41, 42, and 43 formed between the rotor 10b and the fixed cylinder 10a. The fixed cylinder 10a of the rotary joint 10 has ports 41, 42,
43 is provided, and switching valves 17 and 18 are inserted into each of the pipes. Switching valve 1
7 and 18 communicate with a pressure oil pipe 25 and a return pipe 26, respectively.

If the hydraulic switching valve 17 is set to side a, the piston 16 will be in the position shown in Fig. 2, and the diameter of the mandrel will be suitable for the winder.If the switching valve 17 is set to side b, the piston 16 will move to the left and the switching will take place. When the valve 18 is set to the b side, the piston 15 makes a full stroke to the left, the stroke of the wedge shaft 8 increases by S, and the mandrel diameter increases, so it can be used as an unwinding machine. Normal expansion and contraction operations are performed by switching the hydraulic switching valve 18 to ports a and b.

In the device shown in Fig. 2, the mandrel diameter, that is, the outer diameter of the segment 7, can be adjusted in two steps, but the stopping position of the large piston 16 cannot be adjusted steplessly, so it is impossible to change the mandrel diameter in multiple steps. It was hot. In particular, since the operating shaft is supplied to the cylinder chambers A, B, and C via the rotary joint 10, the switching valve 18 is returned to the neutral position shown in FIG. Even if an attempt is made to prevent the oil from going in and out, since the rotor 10b rotates within the stator 10b while the winder is in use, the operating oil moves through the sliding gap between the ports 42 and 43, causing the oil to enter and exit the chamber A. B is small and communicates with the mandrel through an orifice, which has the disadvantage that the mandrel diameter changes during use.

Therefore, in the device shown in FIG. 2, while the winder is in use,
High-pressure operating oil is constantly supplied to chambers A and C via the switching valves 17 and 18, so that even if there is a leakage of operating oil at rotary joint 10, chambers A and C are always kept at a predetermined pressure. Operating oil is now supplied. For this reason, the large piston 16 could only take two positions: the state shown in the figure or the state where it was stroked to the left by S.

Furthermore, as seen in Japanese Utility Model Publication No. 41-10668, there is a system in which an auxiliary piston is provided on the piston that drives the wedge shaft, and the auxiliary piston blocks the port of the rotary joint to change the stroke of the piston in stages. In this known device, the piston right chamber and left chamber of the cylinder communicate with each other via the sliding surface of the rotary joint, making it difficult to maintain the piston at a desired position for a long period of time.

An object of the present invention is to provide a winding and unwinding machine that allows the mandrel diameter to be freely adjusted and that can maintain the set mandrel diameter stably over a long period of time.

The present invention is characterized in that by providing a hydraulic shut-off valve that seals one cylinder on the rotating part side, the mandrel diameter can be kept constant even if there is leakage at the sliding part of the rotating joint. do.

Furthermore, the present invention provides a striker on the rod connected to the piston, and a detector operated by the displacement of the striker to open and close the hydraulic pressure opening valve, and by making it possible to adjust the relative positional relationship between the striker and the detector. , the mandrel diameter can be freely adjusted.

FIG. 3 is a sectional view of essential parts of a winding and unwinding machine embodying the present invention. The piston 15 has a rod 20
The rod 20 passes through the center of the rotor 10b of the rotary joint 10, extends to the outside, and supports a striker 21 on the outside. A seal 45 is provided at the portion of the rod 20 that penetrates the rotor 10b to keep this portion airtight. A detector 22 consisting of a limit switch is provided opposite the striker 21. The piston left chamber D of the cylinder is communicated with the hydraulic on-off valve 23 via a passage 29, and further communicated with the switching valve 18 via a passage 30 and a port 53. The hydraulic on-off valve 23 is provided integrally with the rotor 10b, and as shown in a detailed cross section in FIG. Spring 2
8, and when operating oil is supplied to the passage 25, the valve body 27
a pilot piston 26 that displaces the
It is composed of.

The passage 25 communicates with the switching valve 17 via the port 51, and the switching valve 17 normally maintains the state shown in FIG. 3, and when the striker 21 activates the detector 22, switches to the b side. Drain the operating oil into the passage 25.

When displacing the piston 15 leftward from the state shown in FIG. 3 to enlarge the mandrel diameter, the switching valve 17 is kept in the state shown and the switching valve 18 is switched to the side a. Then, since operating oil is supplied to the passage 25 of the hydraulic on-off valve 23, the valve body 17 is pushed upward, and the passages 29 and 30 communicate with each other.
Operating oil is supplied from the switching valve 18 to the piston right chamber E of the cylinder via the port 52 and the passage 46, while the operating oil in the left chamber D is supplied to the piston via the passage 29 and the hydraulic on-off valve 2.
3. The piston 15 moves to the left because it is discharged through the passage 30, the port 52, and the switching valve 18.

As the piston 15 moves, the striker 21 also moves to the left, finally activating the detector 22.

In response to the signal from the detector 22, the switching valve 17 is switched to the b side, and the operating oil in the passage 25 is discharged, so the hydraulic opening/closing valve 23 is closed, and the passage for discharging the operating oil in the left ventricle D is lost. Piston 15 stops moving and is held in that position.

That is, the piston 15 stops at the position where the striker 21 activates the detector 22. Therefore, if the mounting position of the striker 21 on the rod 20 is made adjustable, the piston 15 can be stopped at any position.

During use of the winding and unwinding machine, the rotor 10b rotates together with the cylinder 9, but the hydraulic switch 23 also rotates, and there is a sliding passage in the passage between the hydraulic switch 23 and the left ventricle D. Since there are no parts, leakage of operating oil is extremely reduced, and the position of the piston 15, that is, the diameter of the mandrel, is stable over a long period of time.

When moving the piston 15 to the right, the switching valve 17 is switched to the a side and the switching valve 18 is switched to the b side to supply operating oil to the left chamber D and drain operating oil from the right chamber E. It is something to do.

As explained above, according to the present invention, by changing the relative positional relationship between the striker and the detector,
The stopping position of the piston can be changed freely, and the mandrel diameter can be changed to the desired diameter.

Furthermore, since the operating oil in one cylinder chamber is sealed off at the rotating part by a hydraulic on-off valve, there is no displacement of the cylinder due to leakage, and the mandrel diameter can be kept stable for a long period of time.

[Brief explanation of the drawing]

Fig. 1 is a general configuration diagram of a winding/unwinding machine, Fig. 2 is a sectional view of main parts of a winding/unwinding machine with a known two-stage expansion/contraction function, and Fig. 3 is a main part diagram of the winding/unwinding machine. FIG. 4 is a vertical cross-sectional view of the main parts of the winding and unwinding machine in which the invention was implemented, and is a detailed cross-sectional view of the hydraulic on-off valve. 8... Wedge shaft, 9... Cylinder, 10... Rotating joint, 10a... Rotor, 10b... Stator, 15
...Piston, 17...Second switching valve, 18...
First switching valve, 20... Rod, 21... Striker, 22... Detector, 23... Hydraulic switch, D
...Left ventricle, E...Right ventricle.

Claims (1)

[Scope of utility model registration request] In the winding and unwinding machine that winds and unwinds the steel strip,
A piston connected to a wedge shaft that expands and contracts the segments, a cylinder in which the piston is fitted, a rotary joint that communicates with the right and left chambers of the piston of the cylinder through passages, and a pipe connected to a port of the rotary joint. a first switching valve communicating through a passage;
a hydraulic on-off valve provided in the rotor of the rotary joint and in a passage communicating between one chamber of the cylinder and the switching valve; an operating oil pipe for opening and closing the hydraulic on-off valve; A second switching valve inserted into the operating oil pipe, a rod connected to the piston and extending through the end face of the cylinder in an airtight manner, a striker provided on the rod, and the position of the striker are detected. The second switching valve is provided with a detector that provides a switching signal for switching the second switching valve in a direction to close the hydraulic on-off valve, and at least one of the detector and the striker is configured to detect when the axial position of the rod is A winding and unwinding machine characterized by being adjustable.