Steel ladle hydraulic lifting device and steel ladle hydraulic lifting system

Abstract

The utility model provides a steel ladle hydraulic lifting device and a steel ladle hydraulic lifting system. The steel ladle hydraulic lifting device comprises a steel ladle lifting appliance, a mounting support and a lifting oil cylinder, the mounting support is fixedly mounted on the device platform; the steel ladle lifting appliance comprises a lifting appliance frame, a plate hook, an automatic hook oil cylinder, a guide wheel and a guide frame; the oil cylinder end of the lifting oil cylinder is rotationally connected with the mounting support, and the piston end of the lifting oil cylinder is rotationally connected with the lifting appliance frame; guide wheels are installed on the periphery of the lifting appliance frame, guide frames are fixedly arranged on the two sides of the lifting appliance frame, and the guide wheels move up and down along the guide frames. The upper end of the plate hook is rotationally connected with the lifting appliance frame, the oil cylinder end of the automatic hook oil cylinder is rotationally connected with the lifting appliance frame, and the piston end of the automatic hook oil cylinder is rotationally connected with the middle of the plate hook. A hydraulic lifting mode can enable the buggy ladle to return to a ladle seat / hoisting position during vacuum treatment, so that the time for waiting for hoisting in and out of the buggy ladle is saved, and the production efficiency is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of metallurgical special machinery, in particular to a ladle hydraulic lifting device and a ladle hydraulic lifting system. Background Art

[0002] When the RH vacuum refining device is refining molten steel, the immersion tube needs to be inserted into the molten steel in the ladle. After the treatment, the immersion tube needs to be separated from the molten steel and the ladle, and there needs to be a certain distance of relative movement between the ladle and the immersion tube. At present, most RH vacuum refining devices use a ladle lifting device to lift and lower the ladle. During the treatment, the ladle car and the ladle are lifted up by the hydraulic lifting device installed under the treatment position for treatment; after the treatment, the hydraulic lifting device descends and lowers the ladle and the ladle car onto the ladle trolley track.

[0003] The existing ladle lifting equipment has the disadvantage that a deep pit must be dug under each processing position to install the ladle lifting equipment; when the RH vacuum refining treatment is carried out, the ladle trolley must stay at the processing position, which restricts the steelmaking process layout and ladle turnover. Since the ladle lifting equipment is installed in a deep pit below the processing position, the equipment may be damaged when a steel leakage accident occurs. The hydraulic lifting device of this ladle has a complex structure, high cost, difficult repair and maintenance, and there are safety hazards. Utility Model Content

[0004] The utility model aims to solve the above technical problems and provides a ladle hydraulic lifting device and a ladle hydraulic lifting system.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A hydraulic lifting device for a ladle comprises a ladle hanger, a mounting support and a lifting cylinder; the mounting support is fixedly installed on a device platform; the ladle hanger comprises a hanger frame, a plate hook, an automatic hooking cylinder, a guide wheel and a guide frame; the cylinder end of the lifting cylinder is rotatably connected to the mounting support, and the piston end of the lifting cylinder is rotatably connected to the hanger frame; the guide wheels are installed on the periphery of the hanger frame, the guide frame is fixedly arranged on both sides of the hanger frame, and the guide wheels move up and down along the guide frame; the upper end of the plate hook is rotatably connected to the middle part of the hanger frame, the cylinder end of the automatic hooking cylinder is rotatably connected to the hanger frame, and the piston end of the automatic hooking cylinder is rotatably connected to the middle part of the plate hook.

[0007] As a preferred technical solution, the ladle hanger is provided with two groups, the two groups of ladle hangers are arranged parallel to each other, the mounting supports and the lifting cylinders are provided with four groups, and the four groups of mounting supports and lifting cylinders are respectively arranged at both ends of the two groups of hanger frames.

[0008] As a preferred technical solution, the angle between each of the four groups of guide frames is 90°, and the axis of each guide wheel is perpendicular to the axis of the lifted ladle.

[0009] As a preferred technical solution, a lifting protection sleeve is sleeved on the outer side of the lifting cylinder, a lifting guide sleeve is fixedly installed on the sling frame, and the lifting protection sleeve is sleeved inside the lifting guide sleeve and is slidably connected to the lifting guide sleeve.

[0010] A ladle hydraulic lifting system is based on the above-mentioned ladle hydraulic lifting device. The ladle hydraulic lifting system includes a hydraulic accumulator and a high-frequency proportional valve, a differential circuit, and a constant-pressure variable pump. The hydraulic accumulator is arranged on the control oil circuit of the high-frequency proportional valve. The high-frequency proportional valve is connected to the constant-pressure variable pump. The rodless chamber and the rod chamber of the lifting cylinder are connected through the differential circuit. The differential circuit takes oil from the rodless chamber and returns the oil in the rod chamber to the rodless chamber.

[0011] After adopting the above technical solution, the utility model has the following advantages:

[0012] The ladle hydraulic lifting device of the utility model adopts a hydraulic lifting method. Compared with the traditional hydraulic lifting method, the hydraulic lifting method can make the ladle car return to the seat / ladle lifting position during vacuum treatment, save the time of waiting for the ladle car to enter and exit the converter, and improve production efficiency. Compared with the traditional lifting and lowering device, the flexibility is enhanced, and there is no need to build a deep pit, which can avoid the damage of molten steel to the hydraulic system in the event of a ladle penetration accident.

[0013] The utility model discloses a hydraulic lifting device for a ladle, which adopts an improved hydraulic lifting system. The traditional hydraulic lifting system adopts a synchronous motor to realize the synchronization of multiple hydraulic cylinders, but the motor has serious loss, high failure rate and cumulative error. This hydraulic lifting system adopts a high-frequency proportional valve to adjust the four hydraulic lifting cylinders to achieve a maximum synchronization error of 10mm. It can adjust multiple hydraulic lifting cylinders according to position detection to achieve synchronization, avoid cumulative errors and realize automatic control. A differential circuit is used to realize low-pressure and large flow in a rodless cavity, which reduces the flow requirement for the pump and reduces costs. The pump adopts a constant pressure variable pump with stepless pressure regulation to achieve matching of the pump's output flow and load. The pump pressure can be adjusted under different load conditions, avoiding energy waste and reducing heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural schematic diagram of a ladle hydraulic lifting device;

[0015] Figure 2 A top view of a ladle hydraulic lifting device;

[0016] Figure 3 This is a position relationship diagram of a support for a ladle hydraulic lifting device;

[0017] Figure 4 It is a structural schematic diagram of the ladle hydraulic lifting device of the embodiment;

[0018] Figure 5 A side view of the hydraulic ladle lifting device of the embodiment;

[0019] Figure 6 It is a structural schematic diagram of a ladle hydraulic lifting system;

[0020] Figure 7 for Figure 6 The enlarged view of the part at A in the middle is the differential circuit;

[0021] Figure 8 for Figure 6 A partial enlarged view of point B in the middle;

[0022] Fig. 9 for Figure 6 A partial enlarged view of point C in the middle. DETAILED DESCRIPTION

[0023] 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.

[0024] like Figure 1-3 As shown, a ladle hydraulic lifting device includes: a ladle hanger, a mounting support 31, and a lifting cylinder 25.

[0025] The mounting support 31 is fixedly mounted on the device platform. The device platform is a fixedly arranged building. In other embodiments, the mounting support 31 can also be fixedly mounted on the steel structure of the factory building.

[0026] The ladle hanger comprises a hanger frame 32 , a plate hook 35 , an automatic hooking cylinder 26 , a guide wheel 33 and a guide frame 34 .

[0027] In this embodiment, the ladle hanger is provided in two groups, the two groups of ladle hangers are arranged in parallel with each other, and the two groups of ladle hangers are respectively used to lift the trunnions on both sides of the ladle. The mounting brackets 31 and the lifting cylinders 25 are both provided in four groups, and the four groups of mounting brackets 31 and the lifting cylinders 25 are respectively arranged at the two ends of the two groups of hanger frames 32. That is, each group of ladle hangers is lifted by two groups of lifting cylinders 25, and the two groups of lifting cylinders 25 are respectively arranged at the two ends of the group of ladle hangers, so that the ladle hangers are lifted stably.

[0028] The cylinder end of the lifting cylinder 25 is rotatably connected to the mounting support 31 via a pin, and the piston end of the lifting cylinder 25 is rotatably connected to the hanger frame 32 .

[0029] The guide wheels 33 are installed on the periphery of the hanger frame 32 , and the guide frames 34 are fixedly arranged on both sides of the hanger frame 32 . The guide wheels 33 move up and down along the guide frames 34 .

[0030] In particular, in this embodiment, the angle between the four groups of guide frames 34 is 90°, and the axis of each guide wheel 33 is perpendicular to the axis of the lifted ladle. This arrangement allows the guide wheel 33 to be radially stressed, reducing the shaking of the ladle when it is lifted.

[0031] The upper end of the plate hook 35 is rotatably connected to the middle of the hanger frame 32, the cylinder end of the automatic hook cylinder 26 is rotatably connected to the hanger frame 32, and the piston end of the automatic hook cylinder 26 is rotatably connected to the middle of the plate hook 35. The plate hook 35 is rotated relative to the hanger frame 32 by the extension and retraction of the automatic hook cylinder 26, so as to realize the connection and disconnection of the plate hook 35 with the ladle trunnion.

[0032] A lifting protection sleeve 36 is sleeved on the outer side of the lifting cylinder 26, and a lifting guide sleeve 37 is fixedly installed on the sling frame 32. The lifting protection sleeve 36 is sleeved inside the lifting guide sleeve 37 and is slidably connected to the lifting guide sleeve 37. The hot molten steel in the ladle bakes the lifting cylinder and easily causes damage to the lifting cylinder 26. In this embodiment, the lifting protection sleeve 36 is provided to play a role of heat insulation protection. After the lifting guide sleeve 37 is lifted upward to the platform of the resistance device, the lifting guide sleeve 37 plays a role of limiting, preventing the sling frame 32 from being further lifted upward.

[0033] The working process of the ladle hydraulic lifting device is as follows:

[0034] 1. The ladle car transports the ladle to the processing position;

[0035] 2. The hydraulic lifting system drives the lifting cylinder 26 to drive the ladle hanger to descend to the lower limit position, and the automatic hook cylinder 25 works to put the plate hook 35 in a vertical position;

[0036] 3. When the hook of the plate hook 35 contacts the trunnion of the ladle, the ladle hoist starts to lift the ladle to the specified position of the process for vacuum treatment;

[0037] 4. After the processing is completed, the ladle hanger falls down, the ladle is placed on the ladle car, the automatic hook cylinder 25 works, the unhooking is completed, the ladle car leaves, and a working cycle is completed.

[0038] like Figure 4-5 As shown, a specific embodiment of the above-mentioned ladle hydraulic lifting device is shown. In this embodiment, two sets of the above-mentioned ladle hydraulic lifting devices are included.

[0039] like Figure 6-9 As shown, this embodiment adopts a ladle hydraulic lifting system, which is used to control the actions of the eight lifting cylinders and four automatic hooking cylinders of the above two groups of ladle hydraulic lifting devices.

[0040] The ladle hydraulic lifting system includes: hydraulic accumulator 1, constant pressure variable pump 40, first ball valve 2, second ball valve 3, first check valve 4, first reversing valve 5, second check valve 6, third check valve 7, high frequency proportional valve 8, third ball valve 9, travel switch 10, first pressure measuring and exhaust joint 11, measuring hose 12, pressure sensor 13, first high pressure hose 14, second high pressure hose 15, explosion-proof valve 16, overflow valve 17, pressure reducing valve 18, second reversing valve 19, fourth check valve 20, throttle valve 21, second pressure measuring and exhaust joint 22, fourth ball valve 23, third high pressure hose 24, lifting cylinder 25, automatic hook cylinder 26, fifth check valve 27. The specific connection method of the above components is shown in Figure 6-9 .

[0041] The first ball valve is a high-pressure ball valve DN20 (DN indicates the pipe diameter, in millimeters), and the second ball valve is a ball valve DN50. The first check valve is a check valve DN10, the second check valve is a hydraulically controlled check valve DN20, and the third check valve is a check valve DN20. The third ball valve is a ball valve DN32. The measuring hose is a measuring hose DN2. The first high-pressure hose is a high-pressure hose P-32MPa, DN32; the second high-pressure hose is a high-pressure hose P-16MPa, DN15. The explosion-proof valve is set to Q=170L / min. The pressure reducing valve is DN10. The fourth check valve is a double hydraulically controlled check valve DN10. The throttle valve is a one-way throttle valve DN10. The fourth ball valve is a high-pressure ball valve DN20. The third high-pressure hose is a high-pressure hose P-32MPa, DN20. The piston cylinder model of the lifting cylinder is Φ320 / 160×4000, and the piston cylinder model of the automatic hook cylinder is Φ100 / 70×1200. The fifth one-way valve is a one-way valve DN6.

[0042] The high-frequency proportional valve 8 is connected to the constant pressure variable pump 40. The high-frequency proportional valve 8 is used to adjust the four hydraulic lifting cylinders 25 of a group of ladle hydraulic lifting devices to achieve a maximum synchronization error of 10 mm. Multiple hydraulic lifting cylinders 25 can be adjusted according to position detection to achieve synchronization, avoid cumulative errors, and achieve automatic control.

[0043] like Figure 7 As shown, the rodless chamber and the rod chamber of the lifting cylinder 25 are connected through the differential circuit, and the differential circuit takes oil from the rodless chamber to return the oil in the rod chamber to the rodless chamber.

[0044] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be regarded as exemplary and non-restrictive from any point of view, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention. Any reference numeral in a claim should not be regarded as limiting the claim to which it relates.

[0045] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A ladle hydraulic lifting device, characterized in that: It includes a ladle hanger, a mounting support and a lifting cylinder; the mounting support is fixedly installed on the device platform; the ladle hanger includes a hanger frame, a plate hook, an automatic hooking cylinder, a guide wheel and a guide frame; the cylinder end of the lifting cylinder is rotatably connected to the mounting support, and the piston end of the lifting cylinder is rotatably connected to the hanger frame; the guide wheels are installed on the periphery of the hanger frame, the guide frame is fixedly arranged on both sides of the hanger frame, and the guide wheels move up and down along the guide frame; the upper end of the plate hook is rotatably connected to the middle part of the hanger frame, the cylinder end of the automatic hooking cylinder is rotatably connected to the hanger frame, and the piston end of the automatic hooking cylinder is rotatably connected to the middle part of the plate hook.

2. A ladle hydraulic lifting device according to claim 1, characterized in that: The ladle hangers are provided with two groups, which are arranged parallel to each other. The mounting supports and the lifting cylinders are provided with four groups, which are respectively arranged at both ends of the two hanger frames.

3. A ladle hydraulic lifting device according to claim 2, characterized in that: The included angle between two of the four groups of guide frames is 90°, and the axis of each guide wheel is perpendicular to the axis of the lifted ladle.

4. The ladle hydraulic lifting device according to claim 1, characterized in that: A lifting protection sleeve is sleeved on the outer side of the lifting cylinder, a lifting guide sleeve is fixedly installed on the sling frame, and the lifting protection sleeve is sleeved inside the lifting guide sleeve and is slidably connected with the lifting guide sleeve.

5. A ladle hydraulic lifting system, characterized in that: A ladle hydraulic lifting device based on any one of claims 1 to 4, the ladle hydraulic lifting system includes a hydraulic accumulator and a high-frequency proportional valve, a differential circuit, and a constant-pressure variable pump, the hydraulic accumulator is arranged on the control oil circuit of the high-frequency proportional valve, the high-frequency proportional valve is connected to the constant-pressure variable pump, the rodless chamber and the rod chamber of the lifting cylinder are connected through the differential circuit, the differential circuit takes oil from the rodless chamber, and the oil in the rod chamber returns to the rodless chamber.

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