Hydraulic system of hydraulic tipping device

Abstract

The utility model belongs to the field of smelting equipment, and particularly relates to a hydraulic system of a hydraulic tipping device, which comprises a tipping hydraulic cylinder used for rotating a hot-metal ladle to dump and a locking hydraulic cylinder used for locking the position of the hot-metal ladle, the tipping hydraulic cylinder and the locking hydraulic cylinder are respectively connected with the hydraulic system through oil ways, and the hydraulic system comprises an oil tank. The oil tank is connected with the hydraulic pump through an oil path, the hydraulic pump is connected with the control valve group through an oil path, the control valve group is respectively connected with the tipping hydraulic cylinder and the locking hydraulic cylinder through oil paths, and the control valve group comprises a first control valve group for controlling the tipping hydraulic cylinder and a second control valve group for controlling the locking hydraulic cylinder. The first control valve set comprises a proportional valve, a standby valve is arranged on the proportional valve in parallel, and an opening mechanism enabling an oil way of the hydraulic pump to be communicated with the standby valve is further arranged, so that when the proportional valve set breaks down, the proportional valve set can be rapidly switched into a common valve set, normal casting work is not affected, and the reliability of the hydraulic system is improved.

Description

Technical Field

[0001] The utility model belongs to the field of smelting equipment, and in particular relates to a hydraulic system of a hydraulic tilting device. Background Art

[0002] At present, iron and steel mills in the metallurgical industry all need to be equipped with tilting equipment for ladles, steel ladles, and slag ladles. For example, when used in conjunction with cast iron machines and continuous casting machines, the molten iron can be poured by tilting the ladles.

[0003] Commonly used tipping methods include: crane tipping, mechanical winch tipping, hydraulic tipping, etc. Crane tipping is expensive and has a high crane occupancy rate, which affects other production efficiencies. In addition, tipping is unstable and prone to accidents. Mechanical winch tipping occupies a large area and has high maintenance costs in the later stage. It also requires supporting tracks, tank cars, tipping pillars, etc. The process layout is cumbersome and it is easy to cross-cut with other processes to affect efficiency. The existing hydraulic tipping has low tipping efficiency, lacks safety protection functions, is inconvenient to maintain and operate, and the tipping stability is greatly affected by the operator's level. Due to the heavy weight of the molten iron tank and the high temperature of the iron (steel) water, an accident is a serious accident, so the hydraulic system needs to be designed to prevent serious consequences from failures. Utility Model Content

[0004] In order to solve the above problems, the utility model provides a hydraulic system of a hydraulic tilting device.

[0005] The purpose of the utility model is achieved in the following way: a hydraulic system of a hydraulic tilting device, including a tilting hydraulic cylinder 7 for rotating a molten iron ladle to tilt, and a locking hydraulic cylinder 10 for locking the position of the molten iron ladle, the tilting hydraulic cylinder 7 and the locking hydraulic cylinder 10 are respectively connected to the hydraulic system through oil circuits, the hydraulic system includes an oil tank 16, the oil tank 16 is connected to a hydraulic pump 14 through an oil circuit, the hydraulic pump 14 is connected to a control valve group through an oil circuit, and the control valve group is respectively connected to the tilting hydraulic cylinder 7 and the locking hydraulic cylinder 10 through an oil circuit,

[0006] The control valve group includes a first control valve group 31 for controlling the tilting hydraulic cylinder 7, and a second control valve group 32 for controlling the locking hydraulic cylinder 10. The first control valve group 31 includes a proportional valve 311, and the proportional valve 311 is provided with a spare valve 312 in parallel, and an opening mechanism for connecting the oil circuit of the hydraulic pump 14 to the spare valve 312 is also provided.

[0007] Furthermore, the opening mechanism includes a reversing valve 313 and a hydraulically controlled one-way valve 314. The reversing valve 313 includes four ports A, B, P, and T. When power is off, port P is connected to port A, and port B is connected to port T. When power is on, port P is connected to port B, and port A is connected to port T. The output end of the hydraulic pump 14 is respectively connected to the proportional valve 311, the P port of the reversing valve 313, and the oil outlet of the hydraulically controlled one-way valve 314 through an oil circuit. The B port of the reversing valve 313 is connected to the control oil circuit of the hydraulically controlled one-way valve 314, and the oil inlet of the hydraulically controlled one-way valve 314 is connected to the standby valve 312.

[0008] Compared with the prior art, the utility model provides a spare valve group for the proportional valve group of the tilting hydraulic cylinder for tilting the ladle, so that when the proportional valve group fails, it can be quickly switched to the ordinary valve group so as not to affect the normal casting work and improve the reliability of the hydraulic system. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 is a schematic diagram of the tipping mechanism structure;

[0010] Figure 2 It is the oil circuit connection diagram of the hydraulic system;

[0011] Figure 3 yes Figure 2 An enlarged view of the first control valve group.

[0012] Among them, 1. tilting bracket, 2. mechanical limit, 3. shaft, 4 column, 5. base, 6. support, 7. tilting hydraulic cylinder, 8. buffer device, 9. on-machine piping, 10. locking hydraulic cylinder, 11. spare hanging shaft, 12. ladle;

[0013] 31. First control valve group, 311. Proportional valve, 312. Backup valve, 313. Reversing valve, 314. Hydraulic one-way valve, 32. Second control valve group. DETAILED DESCRIPTION

[0014] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0015] In the present utility model, unless otherwise expressly specified and limited, the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model.

[0016] As attached Figure 1 As shown, the tipping mechanism includes a base 5 and a column 4, which are fastened by bolts to provide support for the entire tipping mechanism and are conducive to lifting and shipping; the base 5 is fastened to the foundation by anchor bolts, and a support 6 is installed on the base 5 for installing and supporting the tipping hydraulic cylinder 7. A buffer device 8 is also installed to buffer and reduce shock for the tipping bracket 1 when the seat tank is in place and when it falls back, so as to achieve the effect of protecting the tipping hydraulic cylinder 7. A mechanical limit 2 is provided on the column 4, and the mechanical limit 2 is set at the maximum flipping angle of the tipping bracket 1 to avoid accidents caused by excessive tipping. The above makes the overall structure safe and stable.

[0017] The tilting bracket 1 is used to clamp the molten iron ladle 12, provide support for the molten iron ladle, and fix the molten iron ladle to the tilting bracket 1 through the locking hydraulic cylinder 10. The tilting bracket 1 is connected to the column 4 through the axis 3, and the tilting bracket 1 can rotate around the axis 3. The tilting bracket 1 is provided with three guide surfaces. The guide surface 1 and the guide surface 2 are used for guiding and positioning the molten iron ladle in the front and rear directions when the molten iron ladle is placed. The guide surface 3 is used for guiding and positioning the molten iron ladle in the left and right directions. The above positioning facilitates the falling of the molten iron ladle and improves efficiency. It also positions the molten iron ladle and locks it. In addition, a spare hanging shaft 11 is provided at the tail of the tilting bracket. Its size is consistent with that of the molten iron ladle hanging shaft. When the hydraulic system fails, the spare hanging shaft of the crane can be used to realize the mechanical tipping of the tilting mechanism.

[0018] The locking hydraulic cylinder comprises a locking hydraulic cylinder and a locking rod. Under the action of the hydraulic system, the locking hydraulic cylinder drives the locking rod to extend and retract. When extending, the locking rod is inserted into the locking hole of the trunnion box of the molten iron ladle to achieve locking. When retracting, the locking rod is retracted to achieve unlocking.

[0019] The tilting hydraulic cylinder 7 is of the middle ear shaft type, the ear shaft is fixed on the base 5 through the support 6, and the ear shaft is rotatable. The upper ear ring of the hydraulic cylinder 7 is connected to the tilting bracket 1 through the hinge shaft. Under the action of the hydraulic system, the hydraulic cylinder piston rod is extended or retracted. When extended, it drives the tilting bracket to rotate around the axis 3 to realize the tilting action of the tilting mechanism, thereby realizing the dumping of the molten iron in the molten iron ladle; when retracted, the tilting mechanism is realized. The tilting hydraulic cylinder 7 is provided with a cylinder side valve block, and the valve block contains a hydraulic lock and a safety valve. The hydraulic lock can automatically lock the hydraulic cylinder at any position to avoid accidents caused by the rapid fall of the molten iron ladle due to a fault (such as a pipeline rupture). The safety valve is used for overload protection in the event of equipment failure, providing protection for the entire hydraulic system. In addition, a displacement sensor is provided on the tilting hydraulic cylinder, which can feedback the operating position in real time, and cooperate with the proportional valve and PLC system to achieve equal flow casting.

[0020] The tilting hydraulic cylinder 7 and the locking hydraulic cylinder 10 are connected to the hydraulic system oil port through the on-machine piping 9, so that the hydraulic system power and control oil enter the hydraulic cylinder to realize the action of the hydraulic cylinder. The on-machine piping is fixed on the base 5, the column 4, and the tilting bracket 1. The on-machine piping contains stainless steel pipes and high-pressure hoses. The high-pressure hoses are used for the rotating or swinging parts of the tilting structure so as not to affect the action of the tilting mechanism.

[0021] like Figure 2-3 As shown, the tilting hydraulic cylinder 7 and the locking hydraulic cylinder 10 are respectively connected to the hydraulic system through oil circuits, and the hydraulic system includes an oil tank 16, the oil tank 16 is connected to the hydraulic pump 14 through the oil circuit, the hydraulic pump 14 is connected to the control valve group through the oil circuit, and the control valve group is respectively connected to the tilting hydraulic cylinder 7 and the locking hydraulic cylinder 10 through the oil circuit. The control valve group includes a first control valve group 31 for controlling the tilting hydraulic cylinder 7, and a second control valve group 32 for controlling the locking hydraulic cylinder 10. The first control valve group 31 includes a proportional valve 311, and the proportional valve 311 is provided with a spare valve 312 in parallel, and an opening mechanism is also provided to connect the oil circuit of the hydraulic pump 14 to the spare valve 312.

[0022] In detail, the proportional valve 311 is used in normal operation for precise control of the flow rate, and cooperates with the electronic control system to achieve equal flow casting when the tilting mechanism tilts the ladle; the spare valve 312 is an ordinary reversing valve that can achieve oil inlet and oil return, and is used as a backup for the proportional valve 311 group. When the proportional valve 311 group fails, it can be switched to the ordinary valve group, so that the most basic normal casting work can be completed, thereby improving the reliability of the hydraulic system.

[0023] Compared with the prior art, the utility model provides a backup valve group 312 for the proportional valve group 311 of the tilting hydraulic cylinder 7 for tilting the ladle 12, so that when the proportional valve group 311 fails, it can be quickly switched to the ordinary valve group 312 so as not to affect the normal casting work and improve the reliability of the hydraulic system.

[0024] Furthermore, the opening mechanism includes a reversing valve 313 and a hydraulically controlled one-way valve 314. The reversing valve 313 includes four ports A, B, P, and T. When power is off, port P is connected to port A, and port B is connected to port T. When power is on, port P is connected to port B, and port A is connected to port T. The output end of the hydraulic pump 14 is respectively connected to the proportional valve 311, the P port of the reversing valve 313, and the oil outlet of the hydraulically controlled one-way valve 314 through an oil circuit. The B port of the reversing valve 313 is connected to the control oil circuit of the hydraulically controlled one-way valve 314, and the oil inlet of the hydraulically controlled one-way valve 314 is connected to the standby valve 312.

[0025] The hydraulically controlled one-way valve 314 is a prior art. The difference between the hydraulically controlled one-way valve 314 and the ordinary one-way valve is that there is an additional control oil circuit. When the control oil circuit is not connected to the pressure oil, the hydraulically controlled one-way valve works like an ordinary one-way valve, and the pressure oil only flows from the oil inlet to the oil outlet and cannot flow in the opposite direction. When the control oil circuit has a control pressure input, the piston push rod moves to the right under the action of the pressure oil, and the push rod is used to push open the one-way valve, so that the oil inlet and outlet are connected. If the oil outlet is larger than the oil inlet, the oil can flow in the opposite direction. In the utility model, the oil passes through the P port of the reversing valve 313 to the B port, and then to the control oil circuit of the hydraulically controlled one-way valve 314, so that the oil outlet flows into the oil inlet, even if the output oil circuit of the hydraulic pump 14 can enter the standby valve 312.

[0026] The above is only a preferred embodiment of the present invention. It should be pointed out that those skilled in the art can make several changes and improvements without departing from the overall concept of the present invention, and these should also be regarded as the protection scope of the present invention.

Claims

1. A hydraulic system for a hydraulic tilting device, comprising a tilting hydraulic cylinder (7) for rotating a molten iron ladle to tilt, and a locking hydraulic cylinder (10) for locking the position of the molten iron ladle, the tilting hydraulic cylinder (7) and the locking hydraulic cylinder (10) being connected to the hydraulic system via oil circuits, respectively. The hydraulic system comprises an oil tank (16), the oil tank (16) being connected to a hydraulic pump (14) via oil circuits, the hydraulic pump (14) being connected to a control valve group via oil circuits, the control valve group being connected to the tilting hydraulic cylinder (7) and the locking hydraulic cylinder (10) via oil circuits, respectively. The invention is characterized in that: The control valve group comprises a first control valve group (31) for controlling a tilting hydraulic cylinder (7), and a second control valve group (32) for controlling a locking hydraulic cylinder (10); the first control valve group (31) comprises a proportional valve (311); a spare valve (312) is arranged in parallel with the proportional valve (311); and an opening mechanism is also provided for connecting an oil circuit of a hydraulic pump (14) to the spare valve (312).

2. A hydraulic system for a hydraulic tilting device according to claim 1, characterized in that: The opening mechanism comprises a reversing valve (313) and a hydraulically controlled non-return valve (314); the reversing valve (313) comprises four ports A, B, P, and T; when power is off, the P port is connected to the A port, and the B port is connected to the T port; when power is on, the P port is connected to the B port, and the A port is connected to the T port; the output end of the hydraulic pump (14) is respectively connected to the proportional valve (311) and the P port of the reversing valve (313) and the oil outlet of the hydraulically controlled non-return valve (314) through an oil circuit; the B port of the reversing valve (313) is connected to the control oil circuit of the hydraulically controlled non-return valve (314); and the oil inlet of the hydraulically controlled non-return valve (314) is connected to the standby valve (312).

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