Hydraulic lifting synchronizing system of continuous casting tundish car

Abstract

The utility model discloses a hydraulic lifting synchronizing system of a continuous casting tundish car, which adopts a proportional valve synchronous control technology to solve the problem of asynchronous lifting of the tundish car, and adopts an electromagnetic stop valve to control to solve the problem of automatic descending of the tundish car without pressure maintaining. When power failure occurs or a proportional valve and a sensor fail to work, a standby hydraulic motor is adopted for use, at the moment, a post worker needs to open all high-pressure ball valves and operate a manual reversing valve to control lifting of the middle vehicle, the high-pressure ball valves need to be closed after the proportional valve is recovered to be normally used after the failure, and therefore stable pressure maintaining of a system is guaranteed. And meanwhile, the problem that the oil cylinder cannot independently descend for control is solved, and maintenance hidden dangers are eliminated.

Description

Technical Field

[0001] The utility model relates to the technical field of casting, in particular to a hydraulic lifting synchronization system for a continuous casting tundish. Background Art

[0002] Currently, the intermediate car used in continuous casting production uses a synchronous motor to control the lifting and lowering of the hydraulic cylinder, and a solenoid reversing valve to fine-tune the hydraulic cylinder. However, this control system has the following drawbacks: 1. Synchronization errors often occur during production, which can easily lead to casing breakage and production interruption; 2. The intermediate car cannot maintain pressure during lifting and lowering, causing problems with automatic lowering, which hinders production; 3. The hydraulic cylinder cannot lower individually, making maintenance difficult and posing a safety hazard.

[0003] Therefore, there is an urgent need to provide a hydraulic lifting synchronization system for a continuous casting tundish to solve the above problems. Utility Model Content

[0004] The purpose of the utility model is to provide a hydraulic lifting synchronization system for a continuous casting tundish, which can ensure stable and smooth production and improve the safety and convenience of production and maintenance.

[0005] In order to achieve the above object, the utility model provides a hydraulic lifting synchronization system for a continuous casting tundish, which comprises a hydraulic cylinder and an oil inlet and an oil return line respectively controlled when the hydraulic cylinder rises and falls, wherein:

[0006] It is set that when the hydraulic cylinder rises, port b of the proportional reversing valve is energized and the electromagnetic stop valve is energized in both directions. The oil inlet path formed includes the oil inlet port P, the first high-pressure ball valve, the high-pressure filter, the third high-pressure ball valve, the port A of the proportional reversing valve, the electromagnetic stop valve, the second balancing valve and the rodless chamber of the hydraulic cylinder, which are connected in sequence. The oil return path formed includes the rod chamber of the hydraulic cylinder, the second balancing valve, the electromagnetic stop valve, the port B of the proportional reversing valve, the one-way valve and the oil outlet port T, which are connected in sequence.

[0007] At the same time, it is set that when the hydraulic cylinder descends, the a of the proportional reversing valve is energized and the electromagnetic stop valve is energized in both directions, and the oil inlet circuit formed includes the oil inlet port P, the first high-pressure ball valve, the high-pressure filter, the third high-pressure ball valve, the B port of the proportional reversing valve, the electromagnetic stop valve and the rod chamber of the hydraulic cylinder connected in sequence, and the oil return circuit formed includes the rodless chamber of the hydraulic cylinder, the second balancing valve, the electromagnetic stop valve, the A port of the proportional reversing valve, the one-way valve and the oil outlet T connected in sequence;

[0008] It also includes a spare synchronous motor, which is configured to form an oil inlet path when the motor cylinder rises, including an oil inlet port P, a first high-pressure ball valve, a high-pressure filter, a manual reversing valve port A, a hydraulically controlled one-way valve, a one-way throttle valve, a first balancing valve, a synchronous motor, a second high-pressure ball valve and a rodless chamber of the hydraulic cylinder, and an oil return path including a rod chamber of the hydraulic cylinder, a second high-pressure ball valve, a one-way throttle valve, a hydraulically controlled one-way valve, a manual reversing valve port B, a one-way valve and an oil outlet T, which are connected in sequence;

[0009] At the same time, when the motor cylinder is set to descend, the oil inlet circuit formed includes the oil inlet P, the first high-pressure ball valve, the high-pressure filter, the manual reversing valve B port, the hydraulically controlled one-way valve, the one-way throttle valve, the second high-pressure ball valve and the rod chamber of the hydraulic cylinder connected in sequence, and the oil return circuit formed includes the rodless chamber of the hydraulic cylinder, the second high-pressure ball valve, the one-way throttle valve, the hydraulically controlled one-way valve, the manual reversing valve A port, the one-way valve and the oil outlet T connected in sequence.

[0010] Preferably, there are multiple third high-pressure ball valves and each third high-pressure ball valve is connected to the hydraulic cylinder through a proportional reversing valve, an electromagnetic stop valve, and a second balancing valve in sequence.

[0011] Preferably, the hydraulic lifting synchronization system of the continuous casting tundish car further includes a pressure measuring head arranged between the second balancing valve and the hydraulic cylinder.

[0012] According to the above technical scheme, the utility model adopts proportional valve synchronous control technology to improve the problem of asynchronous lifting of the intermediate car, and adopts electromagnetic stop valve control to solve the problem of automatic descent of the intermediate car without maintaining pressure. When a power outage occurs or the proportional valve or sensor fails to work, a spare hydraulic motor is used. At this time, the on-duty personnel are required to open all the high-pressure ball valves, and the personnel operate the manual reversing valve to realize the control of the lifting of the intermediate car. After the fault is restored to normal use of the proportional valve, the high-pressure ball valve needs to be closed to ensure the stable pressure maintenance of the system. At the same time, the problem that the oil cylinder cannot be controlled to descend alone is solved, and the maintenance hidden dangers are eliminated.

[0013] Other features and advantages of the present invention will be described in detail in the subsequent detailed description of the embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the following specific embodiments, they are used to explain the present invention but do not constitute a limitation of the present invention. In the accompanying drawings:

[0015] Figure 1 This is a schematic diagram of the principle of using a synchronous motor on a valve station to synchronize the intermediate tank car in the prior art;

[0016] Figure 2 The utility model provides a schematic diagram of the connection of a hydraulic lifting synchronization system for a continuous casting tundish car.

[0017] Description of Reference Numerals

[0018] 1- One-way valve 2- First high-pressure ball valve

[0019] 3- High pressure filter 4- Manual reversing valve

[0020] 5-Hydraulic control one-way valve 6-One-way throttle valve

[0021] 7-First balancing valve 8-Synchronous motor

[0022] 9-Second high-pressure ball valve 10-Third high-pressure ball valve

[0023] 11-Proportional reversing valve 12-Solenoid stop valve

[0024] 13-Second balancing valve 14-Pressure measuring head

[0025] 15-Hydraulic cylinder DETAILED DESCRIPTION

[0026] The following is a detailed description of the specific embodiments of the present invention in conjunction with the accompanying drawings. It should be understood that the specific embodiments described herein are only used to illustrate and explain the present invention and are not intended to limit the present invention.

[0027] In the present invention, unless otherwise stated, the directional words contained in the terms merely represent the directions of the terms in normal usage, or are common names understood by those skilled in the art, and should not be regarded as limitations on the terms.

[0028] like Figure 1 The old valve station shown uses a synchronous motor to achieve synchronization of the intermediate tank car. In the figure, 1 is a high-pressure filter, 2 is an electro-hydraulic reversing valve, 3 is a manual reversing valve, 4 is a throttle valve, 5 is a balance valve, 6 is a hydraulic motor, 7 is a hydraulically controlled one-way valve, 8 is an electromagnetic reversing valve, 9 is a hydraulically controlled one-way valve, 10 is a high-pressure ball valve, and 11 is a hydraulic cylinder; among them,

[0029] Hydraulic cylinder rising principle: DT12 of electro-hydraulic reversing valve 2 is energized, and manual reversing valve 3 is the backup valve.

[0030] Oil inlet line: P→1 high-pressure filter→2 electro-hydraulic reversing valve (P→A)→4 one-way throttle valve→5 balancing valve→6 hydraulic motor→7 hydraulically controlled one-way valve→10 high-pressure ball valve→11 hydraulic cylinder (rodless chamber).

[0031] Oil return line: 11 hydraulic cylinder (rod chamber) → 10 high-pressure ball valve → 4 → 2 (B → T) → return to oil tank.

[0032] The hydraulic cylinder descends: DT11 of the electro-hydraulic directional valve 2 is energized;

[0033] Oil inlet: P→1→2(P→B)→4→10→11(rod chamber);

[0034] Oil return line: 11 (rodless chamber) → 10 → 7 → 6 → 5 → 4 → 2 (A → T) → oil tank;

[0035] The electromagnetic reversing valve 8 controls the single action of the hydraulic cylinder. It has been verified on site that the hydraulic cylinder can realize the rise of a single cylinder, but cannot realize the fall of a single cylinder. When the point falls, the other three cylinders will also fall slowly.

[0036] The oil cylinder rises: DT17 of the electromagnetic reversing valve 8 is energized and the oil cylinder rises slowly.

[0037] Oil inlet: P→1→8(P→B)→9→10→11(rodless chamber);

[0038] Oil return line: 11 (rod chamber) → 10 → 9 → 8 (A → T) → oil tank;

[0039] The oil cylinder descends: DT18 of the electromagnetic reversing valve 8 is energized, and the oil cylinder descends and the piston rod retracts;

[0040] Oil inlet circuit: P→1→8(P→A)→9→10→11(rod chamber) At this time, the oil in the oil circuit flows to 7 and the valve will be reversed;

[0041] Oil return line: 11 (rodless chamber) → 10 → 9 → 8 → oil tank. Since 7 is reversely conducted at this time, the other oil line is 11 (rodless chamber) → 10 → 7 → 6 → 5 → 4 → 2 (the neutral position does not maintain pressure and slowly leaks, causing the other three cylinders to follow and descend) → oil tank. This is a design defect, which cannot realize the descending action of a single cylinder, seriously restricting inspection and maintenance.

[0042] From the above, it can be seen that the existing fine-tuning control system of the electromagnetic reversing valve controlling the oil cylinder has many defects: 1. The problem of lack of synchronization often occurs in production, which can easily lead to the breaking of the casing and thus interruption of production; 2. The intermediate car cannot maintain pressure when it is raised and lowered, and there is a problem of automatic descent, which causes production difficulties; 3. The oil cylinder cannot realize the single-cylinder descending action, which is difficult to maintain and poses a safety hazard.

[0043] See also Figure 2 The utility model provides a hydraulic lifting synchronization system for a continuous casting tundish, which is characterized in that the hydraulic lifting synchronization system for a continuous casting tundish includes a hydraulic cylinder 15 and an oil inlet and an oil return line respectively controlled when the hydraulic cylinder 15 rises and falls, wherein:

[0044] It is set that when the hydraulic cylinder 15 rises, the b port of the proportional reversing valve 11 is energized and the electromagnetic stop valve 12 is energized in both directions. The oil inlet circuit formed includes the oil inlet port P, the first high-pressure ball valve 2, the high-pressure filter 3, the third high-pressure ball valve 10, the A port of the proportional reversing valve 11, the electromagnetic stop valve 12, the second balancing valve 13 and the rodless chamber of the hydraulic cylinder 15 connected in sequence. The oil return circuit formed includes the rod chamber of the hydraulic cylinder 15, the second balancing valve 13, the electromagnetic stop valve 12, the B port of the proportional reversing valve 11, the one-way valve 1 and the oil outlet T connected in sequence.

[0045] At the same time, it is set that when the hydraulic cylinder 15 descends, a of the proportional reversing valve 11 is energized, and the electromagnetic stop valve 12 is energized in both directions. The oil inlet circuit formed includes the oil inlet port P, the first high-pressure ball valve 2, the high-pressure filter 3, the third high-pressure ball valve 10, the B port of the proportional reversing valve 11, the electromagnetic stop valve 12 and the rod chamber of the hydraulic cylinder 15 connected in sequence. The oil return circuit formed includes the rodless chamber of the hydraulic cylinder 15, the second balancing valve 13, the electromagnetic stop valve 12, the A port of the proportional reversing valve 11, the one-way valve 1 and the oil outlet T connected in sequence;

[0046] It also includes a spare synchronous motor 8, which is configured to form an oil inlet path when the motor cylinder rises, including the oil inlet port P, the first high-pressure ball valve 2, the high-pressure filter 3, the manual reversing valve 4A port, the hydraulically controlled one-way valve 5, the one-way throttle valve 6, the first balancing valve 7, the synchronous motor 8, the second high-pressure ball valve 9 and the rodless chamber of the hydraulic cylinder 15, and the oil return path includes the rod chamber of the hydraulic cylinder 15, the second high-pressure ball valve 9, the one-way throttle valve 6, the hydraulically controlled one-way valve 5, the manual reversing valve 4B port, the one-way valve 1 and the oil outlet T, which are connected in sequence;

[0047] At the same time, when the motor cylinder is set to descend, the oil inlet circuit formed includes the oil inlet P, the first high-pressure ball valve 2, the high-pressure filter 3, the manual reversing valve 4B port, the hydraulically controlled one-way valve 5, the one-way throttle valve 6, the second high-pressure ball valve 9 and the rod chamber of the hydraulic cylinder 15 connected in sequence, and the oil return circuit formed includes the rodless chamber of the hydraulic cylinder 15, the second high-pressure ball valve 9, the one-way throttle valve 6, the hydraulically controlled one-way valve 5, the manual reversing valve 4A port, the one-way valve 1 and the oil outlet T connected in sequence.

[0048] In this embodiment, in order to further optimize the hydraulic lifting synchronization system of the continuous casting tundish, a plurality of third high-pressure ball valves 10 are provided and each third high-pressure ball valve 10 is connected to the hydraulic cylinder 15 in sequence through the proportional reversing valve 11, the electromagnetic stop valve 12, and the second balancing valve 13.

[0049] In addition, in order to facilitate pressure measurement and control, the hydraulic lifting synchronization system of the continuous casting tundish preferably further includes a pressure measuring head 14 disposed between the second balancing valve 13 and the hydraulic cylinder 15 .

[0050] Through the above technical solution, the normal use part of the system is mainly controlled by the proportional reversing valve 11, and the proportional valve and the oil cylinder displacement sensor are used to control the synchronous lifting through the synchronous controller; the standby part is mainly controlled by the synchronous motor 8. Its working principle is: in normal production, it mainly relies on the proportional valve working oil circuit through the third high-pressure ball valve 10 → proportional reversing valve 11 → electromagnetic stop valve 12 → second balance valve 13 → hydraulic cylinder 15 to work, the second high-pressure ball valve 9 is in the normally closed state, and the second balance valve 13 works when the hydraulic cylinder descends; when there is a power outage or the proportional valve or sensor fails to work, the standby hydraulic motor is used. At this time, the on-site personnel need to open all the second high-pressure ball valves 9, and the personnel operate the manual reversing valve 4 to realize the control of the lifting of the intermediate car. After the fault is restored and the proportional valve is used normally, the second high-pressure ball valve 9 needs to be closed to ensure the pressure stability of the system. The specific oil circuit formation and control in this process are as follows:

[0051] The oil cylinder rises: b of the proportional reversing valve 11 is energized, and the electromagnetic stop valve 12 is energized in both directions;

[0052] Oil inlet: oil inlet P → first high-pressure ball valve 2 → high-pressure filter 3 → third high-pressure ball valve 10 → proportional reversing valve 11 (P→A) → solenoid stop valve 12 → second balancing valve 13 → hydraulic cylinder 15 (rodless chamber);

[0053] Oil return line: hydraulic cylinder 15 (rod chamber) → second balancing valve 13 → electromagnetic stop valve 12 → proportional reversing valve 11 (B→T) → one-way valve 1 → oil return port T.

[0054] The oil cylinder descends: a of the proportional reversing valve 11 is energized, and the electromagnetic stop valve 12 is energized in both directions;

[0055] Oil inlet: oil inlet P → first high-pressure ball valve 2 → high-pressure filter 3 → third high-pressure ball valve 10 → proportional reversing valve 11 (P→B) → solenoid stop valve 12 → hydraulic cylinder 15 (rod chamber);

[0056] Oil return line: hydraulic cylinder 15 (rodless chamber) → second balancing valve 13 → electromagnetic stop valve 12 → proportional reversing valve 11 (A→T) → one-way valve 1 → oil return port T.

[0057] By controlling a single proportional valve, the raising and lowering actions of a single cylinder can be achieved.

[0058] Principle of standby synchronous motor: the oil cylinder rises the manual reversing valve 4 (P→A), and the second high-pressure ball valve 9 needs to be opened manually;

[0059] Oil inlet: oil inlet P → first high-pressure ball valve 2 → high-pressure filter 3 → manual reversing valve 4 (P→A) → hydraulically controlled one-way valve 5 → one-way throttle valve 6 → first balancing valve 7 → synchronous motor 8 → second high-pressure ball valve 9 → hydraulic cylinder 15 (rodless chamber)

[0060] Oil return line: hydraulic cylinder 15 (rod chamber) → second high-pressure ball valve 9 → one-way throttle valve 6 → hydraulically controlled one-way valve 5 → manual reversing valve 4 (B→T) → one-way valve 1 → oil tank.

[0061] The principle of synchronous motor cylinder lowering will not be described in detail.

[0062] The preferred embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the scope of protection of the present invention.

[0063] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, the present invention will not further describe various possible combinations.

[0064] In addition, the various embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the present invention, they should also be regarded as the contents disclosed by the present invention.

Claims

1. A hydraulic lifting synchronization system for a continuous casting tundish, characterized in that: The hydraulic lifting synchronization system of the continuous casting tundish comprises a hydraulic cylinder (15) and an oil inlet and an oil return path respectively controlled when the hydraulic cylinder (15) rises and falls, wherein: It is arranged that when the hydraulic cylinder (15) rises, port b of the proportional reversing valve (11) is energized and the electromagnetic stop valve (12) is bidirectionally energized, and the formed oil inlet circuit includes an oil inlet port P, a first high-pressure ball valve (2), a high-pressure filter (3), a third high-pressure ball valve (10), a port A of the proportional reversing valve (11), an electromagnetic stop valve (12), a second balancing valve (13) and a rodless chamber of the hydraulic cylinder (15) which are connected in sequence, and the formed oil return circuit includes a rod chamber of the hydraulic cylinder (15), a second balancing valve (13), an electromagnetic stop valve (12), a port B of the proportional reversing valve (11), a check valve (1) and an oil outlet T which are connected in sequence; At the same time, it is configured that when the hydraulic cylinder (15) descends, a of the proportional reversing valve (11) is energized, and the electromagnetic stop valve (12) is bidirectionally energized, and the formed oil inlet circuit includes the oil inlet port P, the first high-pressure ball valve (2), the high-pressure filter (3), the third high-pressure ball valve (10), the B port of the proportional reversing valve (11), the electromagnetic stop valve (12) and the rod chamber of the hydraulic cylinder (15) which are connected in sequence, and the formed oil return circuit includes the rodless chamber of the hydraulic cylinder (15), the second balancing valve (13), the electromagnetic stop valve (12), the A port of the proportional reversing valve (11), the check valve (1) and the oil outlet T which are connected in sequence; It also includes a spare synchronous motor (8), which is configured such that when the motor oil cylinder rises, the oil inlet path formed includes an oil inlet port P, a first high-pressure ball valve (2), a high-pressure filter (3), a manual reversing valve (4) port A, a hydraulically controlled one-way valve (5), a one-way throttle valve (6), a first balancing valve (7), a synchronous motor (8), a second high-pressure ball valve (9) and a rodless chamber of a hydraulic cylinder (15) which are connected in sequence, and the oil return path formed includes a rod chamber of a hydraulic cylinder (15), a second high-pressure ball valve (9), a one-way throttle valve (6), a hydraulically controlled one-way valve (5), a manual reversing valve (4) port B, a one-way valve (1) and an oil outlet T which are connected in sequence; At the same time, when the motor oil cylinder descends, the oil inlet circuit formed includes the oil inlet port P, the first high-pressure ball valve (2), the high-pressure filter (3), the B port of the manual reversing valve (4), the hydraulically controlled one-way valve (5), the one-way throttle valve (6), the second high-pressure ball valve (9) and the rod chamber of the hydraulic cylinder (15) connected in sequence, and the oil return circuit formed includes the rodless chamber of the hydraulic cylinder (15), the second high-pressure ball valve (9), the one-way throttle valve (6), the hydraulically controlled one-way valve (5), the A port of the manual reversing valve (4), the one-way valve (1) and the oil outlet T connected in sequence.

2. The hydraulic lifting synchronization system for continuous casting tundish according to claim 1 is characterized in that: There are multiple third high-pressure ball valves (10), and each third high-pressure ball valve (10) is connected to the hydraulic cylinder (15) in sequence through a proportional reversing valve (11), an electromagnetic stop valve (12), and a second balancing valve (13).

3. The hydraulic lifting synchronization system for continuous casting tundish according to claim 2 is characterized in that: The continuous casting tundish hydraulic lifting synchronization system further comprises a pressure measuring head (14) arranged between the second balancing valve (13) and the hydraulic cylinder (15).

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