JP2001001041A - Device for adjusting quantity of high-pressure water flowing through main ram for hot extrusion - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate personal error and to stabilize the operation of a press by fixing the tip of the rod of a hydraulic cylinder, controlling vertical motion by oil pressure of the adjusted flow from a hydraulic unit which is proportioned to the motion of a joy stick, attaching an encoder to the cylinder and detecting the position with a position detecting rod arranged in parallel to the cylinder rod. SOLUTION: The joy stick 20 is used and controlled with the pressure compensated flow rate control valve 15 of a valve stand arranging a proportional control valve through a control panel 19 in order to obtain a flow rate proportional to the current value. A sign 21 shown by Fig. is a check valve. In this way, the error in a transmission system is eliminated by using hydraulic control for positioning an upper limit stopper 5 and the control is simplified by using the joy stick 20 and inserting the proportional valve in order to obtain the flow rate proportional to the current value. Moreover, by fixing the encoder 16 to the hydraulic cylinder 9 for detecting the position and digitizing the position, the personal difference is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main ram high-pressure water regulator for hot extrusion in the production of steel pipes by hot extrusion.

[0002]

2. Description of the Related Art Conventionally, the flow rate of high-pressure water to a main ram for hot extrusion in the production of steel pipes by hot extrusion is set by the opening of a valve as shown in FIG. 1
Is determined by the rise of the spindle 2 below the valve block, and the spindle 2 is connected to the tappet 5 attached to the link mechanism 4 by the eject cylinder 3 below the link mechanism.
Is pushed up. The push-up margin is set at the stop position of the upper limit stopper 6 of the link mechanism 4. In the current method, the stop position of the upper limit stopper 6 of the link mechanism 4 is determined by the angle of the control lever 8 connected by the connecting rod 7.

FIG. 3 is an explanatory view of a mechanism relating to a conventional pusher lever. As shown in FIG. 3, when hydraulic pressure is used as the power source, the hydraulic cylinder 9 is operated by the flow rate of oil from the servo line 10, while the hydraulic cylinder is driven by the upper stopper fixing part 11 and the cylinder fixing part 1.
2 and the stroke 13 between them is the connecting rod 7
The angle was determined by the angle of the control bar 8 connected by.

However, there is a large error in the transmission system of the connecting rod due to backlash of the joint portion, elongation or bending of the connecting rod, and the like.
Adjustment margin of the upper limit stopper which is 40mm is about 60-7 at present
It is as short as about 0 mm. Also, since there are many joints and the backlash is large, a large load is applied to the control lever, which makes it difficult to control. In addition, since the lever angle is set in a human sense, the actual situation is that individual differences are generated and driving errors are increased.

[0005]

As described above, conventionally, the position of the stopper is determined by connecting the lever of the press cab and the stopper with the shaft, but the error in the transmission system and the inclination of the lever are determined. However, there is a problem in that the position of the stopper is not constant because there are many human errors due to the inability to quantify the position.

[0006]

Means for Solving the Problems In order to solve the above problems, the present inventors have made intensive developments, and as a result, use a hydraulic pressure as a power source, perform up and down movement with a hydraulic cylinder via a proportional valve, The position detection is to provide a main ram high-pressure water flow adjusting device for hot extrusion in the steel pipe production by the hot extrusion method in which a cylinder, particularly an encoder is attached and a position synchronized with the cylinder is read and individual errors are eliminated. . The gist of the invention is that, in a hot extrusion main ram high-pressure water volume adjusting device for producing a steel pipe by a hot extrusion method, a rod end of a hydraulic cylinder is fixed,
A proportional control valve is provided, and the vertical movement is controlled by the hydraulic pressure adjusted from the hydraulic unit in proportion to the joystick movement. The hot-extrusion main ram high-pressure water amount adjusting device is characterized in that the position is detected from the main ram.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to the drawings. FIG. 1 is an explanatory view of a mechanism relating to a pusher lever according to the present invention. As shown in FIG. 1, the hydraulic pressure is used as a power source, the tip of the rod 14 of the hydraulic cylinder is fixed, and the hydraulic pressure adjusted from the hydraulic unit provided with the valve stand flow control valve 15 provided with the proportional control valve is provided. In addition to controlling the vertical movement of the cylinder rod 14, the encoder 16 is attached to the hydraulic cylinder 9 for position detection, and the position is detected from a position detection rod 17 arranged parallel to the rod 14.

On the other hand, as a control method, a joystick 20 is used, and its current value is controlled by a valve stand flow control valve 15 provided with a proportional control valve via a control panel 19 in order to supply a proportional flow rate. Things. Reference numeral 21 denotes a check valve. This eliminates errors in the transmission system by using hydraulic control to position the upper stopper, and uses a joystick as a control method and inserts a proportional valve to supply a flow rate proportional to the current value. The control was simplified. In addition, the encoder is fixed to the cylinder for position detection, and the position is quantified to eliminate individual differences.

That is, for example, the adjustment allowance of the valve opening is 1
Since it is 40 mm, the adjustment of the stroke 13 of the hydraulic cylinder for raising and lowering the stopper is set at 140 mm. Further, in controlling the cylinder, a hydraulic pressure having a flow rate proportional to the movement of the joystick 20 in the cab is supplied to the cylinder 9 from a proportional valve including the valve stand flow control valve 15, and the stopper is moved up and down. Further, for the detection of the stopper stop position, the encoder 16 is fixed to the side surface of the cylinder, and the position is detected from the position detection rod 17 located in parallel with the cylinder via the vibration interference device 18 on the plate extended from the tip of the cylinder rod. This is done by reading.

[0010]

As described above, by using the hydraulic cylinder according to the present invention, errors in the transmission system can be eliminated, and a proportional valve is provided for simplifying the control to give a flow rate proportional to the current value. In addition, the position detection method has an extremely excellent effect of stabilizing the press operation such that individual errors can be eliminated by fixing the hydraulic cylinder and reading the position.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a mechanism relating to a pusher lever according to the present invention.

FIG. 2 is an explanatory diagram of a main ram high-pressure water amount adjusting device for hot extrusion in the production of a steel pipe by a conventional hot extrusion method.

FIG. 3 is an explanatory view of a mechanism relating to a conventional pusher lever.

[Explanation of symbols]

 1 Valve opening 2 Spindle 3 Eject cylinder 4 Link mechanism 5 Tappet 6 Upper limit stopper 7 Connecting rod 8 Control lever 9 Hydraulic cylinder 10 Servo line 11 Upper limit stopper fixing part 12 Cylinder fixing part 13 Stroke 14 Cylinder rod 15 Valve stand flow control valve 16 Encoder 17 Position detection rod 18 Interference device 19 Control panel 20 Joystick 21 Check valve

Claims (1)

[Claims] 1. A main ram high-pressure water adjusting device for hot extrusion in the production of a steel pipe by hot extrusion, wherein a rod end of a hydraulic cylinder is fixed, a proportional control valve is provided, and a hydraulic pressure proportional to the movement of a joystick is provided. Main body for hot extrusion, characterized in that the vertical movement is controlled by the hydraulic pressure adjusted from the unit and the position is detected by mounting an encoder on the cylinder and detecting the position from a position detection rod arranged parallel to the cylinder rod. Ram high pressure water regulator.