CN100493772C - Hydraulic system for casting and rolling and dynamic soft reduction - Google Patents

Abstract

A hydraulic system for casting, rolling and dynamic light pressing is composed of two hydraulic units for casting and rolling before the sectorial segment, two hydraulic units for casting and rolling behind the sectorial segment, and the clamping controller connected with said hydraulic units and consisting of cut-off valve, hydraulically controlled check valve and electromagnetic commutation valve. Said hydraulic unit has the proportional servo valve. Its advantage is automatic regulation.

Description

Hydraulic system for casting and rolling and dynamic soft reduction

technical field

The present invention relates to a hydraulic system equipment, in particular to a hydraulic system equipment in the field of metallurgical slab continuous casting equipment, which enables the secondary cooling sector of the continuous casting machine to have the functions of slab liquid core casting and rolling and dynamic soft reduction, specifically Hydraulic system for casting and rolling and dynamic soft reduction.

Background technique

Casting and rolling refers to the process of reducing the thickness of the billet section through the adjustment of the opening of the sector rollers in the continuous casting machine production process; the dynamic light reduction refers to the During the production process of the continuous casting machine, the casting slab section near the end of internal solidification is lightly pressed through the adjustment of the opening degree of the sector roller to improve the internal quality of the slab. The traditional hydraulic clamping segment is mainly composed of an upper frame, a lower frame, a clamping cylinder, a roller, and an adjustment block. According to the thickness of the continuous casting slab to be produced, choose different thicknesses of the adjustment pads, clamp the upper frame and the lower frame against the adjustment pads by the clamping oil cylinder, so that the opening between the rollers of the upper and lower frames is the required casting size. Blank thickness. Since the opening of this traditional hydraulic clamping segment is determined by the adjusting block, the thickness cannot be adjusted during the production process of the continuous casting machine, and casting and rolling and dynamic light pressing cannot be performed.

Contents of the invention

The object of the present invention is to provide a hydraulic system for casting and dynamic soft reduction, so as to be able to carry out casting and dynamic soft reduction.

The technical solution of the present invention is to design a hydraulic system for casting and rolling and dynamic soft reduction, which includes a casting and rolling hydraulic device, a control device, and a hydraulic clamping device. It is characterized in that: there are two Casting and rolling hydraulic devices, there are two casting and rolling hydraulic devices on both sides of the rear of the sector; the casting and rolling hydraulic devices are connected with the clamping control device.

The casting and rolling hydraulic device includes a clamping hydraulic cylinder, a stop valve 2, a hydraulic control check valve 4, a proportional servo valve 6, a safety valve 7, a check valve 8, a pressure sensor 9, a displacement sensor 10, and the displacement sensor 10 is fixed On the cylinder head of the clamping hydraulic cylinder, the oil pressure end of the clamping hydraulic cylinder is connected to the A terminal of the proportional servo valve 6 through the hydraulic control check valve 4 at the right end; the oil return end of the clamping hydraulic cylinder is connected with the hydraulic control check valve 4 at the left end. The B end of the proportional servo valve 6 is connected; the stop valve 2 and the check valve 8 are connected in series between the oil return end and the oil pressure end of the clamping hydraulic cylinder; the left and right hydraulic control check valves 4 are respectively connected with a pressure sensor 9 and a stop valve 2 The connection point with the one-way valve 8 is connected with the other end of the stop valve 2 with a safety valve 7, and the connection point between the stop valve 2 and the one-way valve 8 is connected with the oil return end of the proportional servo valve 6.

The clamping control device includes a cut-off valve 1, a hydraulic control check valve 3, and an electromagnetic reversing valve 5. The P and T oil circuits of the electromagnetic reversing valve 5 are connected to the cut-off valve 1, and the P The terminal is connected to the external pressure oil terminal at the same time; the T terminal of the electromagnetic reversing valve is connected to the external oil return terminal and the T terminal of the proportional servo valve 6 in the casting and rolling hydraulic device at the same time; the control output terminal of the hydraulic control check valve 3 is connected to the casting and rolling hydraulic device. The P end of the proportional servo valve 6 is connected.

The present invention is characterized in that it is composed of a segment clamping hydraulic cylinder with a displacement sensor, a segment casting and rolling hydraulic device, and a segment clamping control device. The system uses a proportional servo valve to perform closed-loop position control of the clamping hydraulic cylinder, and has a position closed-loop pressure compensation function, and the dynamic position control has high precision. Each of the 4 clamping hydraulic cylinders in the sector section can be independently closed-loop controlled, and the dynamic position control accuracy is high; the sector section equipped with this system can realize the dynamic speed synchronous action of each clamping hydraulic cylinder; according to the given According to the fixed position-time curve, the opening position of the fan-shaped segment can be grouped and flexibly adjusted. This hydraulic system is not only suitable for the group synchronous reduction of large reductions during the liquid core casting and rolling of the slab, but also suitable for the dynamic soft reduction of the slab that dynamically tracks the solidification end of the slab for light reduction. It is very suitable for intelligent continuous casting machines. hydraulic system equipment.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings of the embodiments.

Figure 1 is a schematic diagram of the connection of the embodiment.

In Fig. 1: 1. Globe valve; 2. Globe valve; 3. Hydraulic control check valve; 4. Hydraulic control check valve; 5. Electromagnetic reversing valve; 6. Proportional servo valve; 7. Safety valve; 8. Check valve; 9. Pressure sensor; 10. Displacement sensor; M. Pressure measuring point; C1. Clamping hydraulic cylinder; C2. Clamping hydraulic cylinder; C3. Clamping hydraulic cylinder; C4. Clamping hydraulic cylinder; D. Roller; E1~E4, segment casting and rolling hydraulic device; E5, segment clamping control device; T, oil return port; P, oil pressure port.

Detailed ways

As shown in Figure 1, the present invention mainly includes four hydraulic cylinders for sector clamping with displacement sensors including C1, C2, C3, and C4, four sector casting and rolling hydraulic devices including four units E1~E4, and four sector clamping cylinders. There is 1 control device E5 in total; casting and rolling hydraulic devices E1~E4 are connected with clamping control device E5; casting and rolling hydraulic devices include clamping hydraulic cylinder, stop valve 2, hydraulic control check valve 4, proportional servo valve 6, safety valve 7. One-way valve 8, pressure sensor 9, displacement sensor 10; displacement sensor 10 has four parts 10.1, 10, 2, 10.3, 10.4 respectively fixed on the cylinder heads of clamping hydraulic cylinders C1, C2, C3, C4 . There are two clamping hydraulic cylinders C1 and C2 on both sides of the front of the fan section, and the two clamping hydraulic cylinders C1 and C2 clamp the roller. There is an upper frame above the roller and a lower frame below the roller; also at the rear of the fan section There are two clamping hydraulic cylinders C3 and C4 on both sides; the two clamping hydraulic cylinders C3 and C4 clamp the roller. There is an upper frame on the roller and a lower frame below the roller; The control check valve 4 is connected to the A end of the proportional servo valve 6; the oil return end T of the clamping hydraulic cylinder is connected to the B end of the proportional servo valve 6 through the left hydraulic control check valve 4; the oil return end T of the clamping hydraulic cylinder is connected to The shut-off valve 2 and the one-way valve 8 are connected in series between the oil pressure port P; The connection point of the safety valve 7 , the stop valve 2 and the one-way valve 8 is connected to the oil return port T of the proportional servo valve 6 . The clamping control device includes cut-off valve 1, hydraulic control check valve 3, electromagnetic reversing valve 5, and electromagnetic reversing valve 5; the oil pressure port P and the oil return port T are connected with the stop valve 1 and the electromagnetic reversing valve. The oil pressure port P of the valve 5 is connected to the external pressure oil port at the same time; the oil return port T of the electromagnetic reversing valve is connected to the external oil return port T and the oil return port T of the proportional servo valve 6 in the casting and rolling hydraulic device at the same time; the hydraulic control unit The control output port of the valve 3 and the oil pressure port P of the proportional servo valve 6 in the casting and rolling hydraulic device. Each sector casting and rolling hydraulic device is used for the control of one sector clamping cylinder, and 4 sets of sector casting and rolling hydraulic devices and their clamping cylinders on the sector constitute the casting and rolling and dynamic light pressing of the casting slab by the sector Lower hydraulic controls. The segment clamping control device is used for the input of the segment casting and rolling and dynamic light reduction function or to lock the position of the segment in case of failure.

In the "in" state of the segment casting and rolling and dynamic soft pressing functions controlled by the segment clamping control device, under the control of the electromagnetic reversing valve 5, the hydraulic control check valve 3 and the hydraulic control check valve 4 are both controlled. Open. In this state, according to the opening degree of the front (or rear) of the fan section required by the process, the dynamic position closed-loop control of the two front clamping cylinders (or the two rear clamping cylinders) is carried out respectively, that is, the given front The position-time curves required by the first two clamping cylinders (or the two rear clamping cylinders), the feedback signal of the displacement sensor 10 on each of the front (or rear) clamping cylinders to detect their respective actual positions and Compared with the given position-time curves, the proportional servo valve 6 on the corresponding casting and rolling hydraulic device is controlled to make the position of the clamping cylinder meet the requirements of its given position signal. A pressure sensor 9 is installed in the piston rod cavity and piston cavity oil circuit of each clamping cylinder to detect the pressure of the corresponding oil circuit respectively. The pressure detection signal can be used as the internal feedback signal for the closed-loop control of the dynamic position of the corresponding clamping cylinder. to improve its dynamic quality. Through the above control, the two clamping cylinders at the front and the rear of the segment are respectively operated synchronously according to their respective given position-time curves, so as to realize the functions of liquid core casting and rolling and dynamic soft reduction of the segment on the slab.

In the "locked" state of the segment position controlled by the segment clamping control device, under the control of the electromagnetic reversing valve 5, both the hydraulic control check valve 3 and the hydraulic control check valve 4 are closed, and the 4 segments are clamped. The hydraulic cylinder is locked, ie the position of the segments is locked.

In Fig. 1, M is the pressure measuring point, which can easily measure the pressure of the corresponding oil circuit point; the stop valve 1 and 2 are used for oil circuit flushing during installation and maintenance; the overflow valve 7 overflows when hydraulic shock occurs during the production process, At the same time, the one-way valve 8 supplies oil to the piston chamber of the oil cylinder when the overflow valve overflows, and they play a role in safety protection for the equipment.

Claims (1)

1. Hydraulic system equipment for casting and rolling and dynamic soft reduction, which includes casting and rolling hydraulic devices, control devices, and hydraulic clamping devices. There are two casting and rolling hydraulic devices on both sides of the rear part of the section; the casting and rolling hydraulic devices are connected with the clamping control device; the casting and rolling hydraulic devices include clamping hydraulic cylinders, stop valves (2), hydraulic control check valves (4 ), proportional servo valve (6), safety valve (7), check valve (8), pressure sensor (9), displacement sensor (10), displacement sensor (10) is fixed on the cylinder head of the clamping hydraulic cylinder, clamping The oil pressure end of the clamping hydraulic cylinder is connected to the A terminal of the proportional servo valve (6) through the hydraulic control check valve (4) at the right end; the oil return end of the clamping hydraulic cylinder is connected to the proportional servo valve (6) through the hydraulic control check valve (4) at the left end 6) B-end connection: the shut-off valve (2) and check valve (8) are connected in series between the oil return end and the oil pressure end of the clamping hydraulic cylinder; the left and right hydraulic control check valves (4) are respectively connected with pressure sensors ( 9), the connection point of the stop valve (2) and the one-way valve (8) is connected with the other end of the stop valve (2) with a safety valve (7), and the connection point of the stop valve (2) and the one-way valve (8) is connected with the The oil return end of the proportional servo valve (6) is connected; the clamping control device includes a stop valve (1), a hydraulic control check valve (3), an electromagnetic reversing valve (5), and an electromagnetic reversing valve (5) The stop valve (1) is connected between the P and T oil circuits of the solenoid valve (5), and the P end of the electromagnetic reversing valve (5) is connected to the external pressure oil end at the same time; the T end of the electromagnetic reversing valve is connected to the external oil return end and the casting and rolling hydraulic device The T end of the proportional servo valve (6); the control output end of the hydraulic control check valve (3) is connected with the P end of the proportional servo valve (6) in the casting and rolling hydraulic device.

Images