JPH045997Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention is capable of suctioning molten metal slag by bringing the suction port of the suction head for removing molten metal slag close to the molten metal slag in a ladle or torpedo car by lowering the suction head. Regarding the removing device, in detail, a fluid pressure cylinder that raises and lowers a suction head for removing molten metal slag, a fluid pressure cylinder that raises and lowers the suction head in case of an emergency,
The present invention relates to a molten metal slag removal device comprising an accumulator that applies accumulated fluid pressure to the emergency lifting fluid pressure cylinder sufficient to raise the suction head against its own weight.

[Conventional technology]

Conventionally, in the above-mentioned molten metal slag removal device, the suction head is constantly urged toward the upward movement side with a force greater than its own weight by constantly applying the accumulated fluid pressure of the accumulator to the emergency upward movement hydraulic cylinder. This prevents the suction head from unexpectedly falling under its own weight due to an abnormality in the fluid pressure cylinder for lifting/lowering operation or the fluid pressure supply structure for it (for example, Japanese Patent Application No. 1983-
(See Publication No. 177573).

[Problem that the invention attempts to solve]

However, in the case of the conventional structure in which the suction head is always upwardly biased by the accumulated fluid pressure from the accumulator, the required descending operation force changes sequentially due to changes in the accumulator accumulated fluid pressure as the suction head descends. There is a problem in that this leads to a decrease in control accuracy in suction head descending speed control, and in particular, since the accuracy of descending speed control greatly affects the accuracy of slag suction amount control, the accuracy of suction head descending speed control decreases. Avoiding this was an important issue.

The purpose of the present invention is to rationally improve the operating configuration for the emergency ascent hydraulic cylinder.
The object of the present invention is to accurately control the descending speed of the suction head while ensuring safety against unexpected descent of the suction head's own weight.

[Means for solving problems]

The characteristic structure of the molten metal slag removal device according to the present invention is a first state in which the cylinder chamber of the emergency lifting fluid pressure cylinder is communicated with the pressure fluid discharge passage, and a fluid pressure that is sufficient to raise the suction head against its own weight is accumulated. The second
a valve mechanism that selectively switches the flow path between the two states, and a sensor that detects an abnormality in the fluid pressure cylinder for lifting and lowering the suction head, and maintains the valve mechanism in the first state when no abnormality is detected. and a control device that switches to the second state at the time of detecting an abnormality, and its functions and effects are as follows.

[Effect]

In other words, when no abnormality is detected, by communicating the cylinder chamber of the emergency ascent fluid pressure cylinder with the pressure fluid discharge path and leaving the emergency ascent fluid pressure cylinder in a free state, the accumulated fluid pressure of the accumulator is reduced. This avoids any influence on the descending operation of the suction head, and by applying the accumulated fluid pressure of the accumulator to the emergency lifting fluid pressure cylinder at the time of detection of an abnormality, the applied accumulated fluid pressure can be used to prevent an emergency. The lifting force of the lifting hydraulic cylinder prevents the suction head from unexpectedly lowering due to its own weight due to an abnormality in the lifting hydraulic cylinder.

[Effect of idea]

As a result, the same level of safety as before when an abnormality occurs in the hydraulic cylinder for lifting/lowering operations can be ensured. Moreover, since the suction head can be lowered with a constant lowering force without any sequential changes in the required lowering force due to changes in the accumulated fluid pressure in the accumulator, the lowering speed of the suction head can be controlled. This has made it possible to control the amount of slag suction, which is important in order to avoid accidents caused by excessive suction of slag and to maintain the efficiency of suction and removal of slag as high as possible. Control accuracy can be improved, and as a whole,
A molten metal slag removal device has been created that is excellent in both safety and slag removal workability.

〔Example〕

Next, embodiments of the present invention will be described.

As shown in FIG. 1, a suction head 5 for sucking and removing molten metal slag, which is connected to an intake device 4 via a suction transport pipe 1, a slag separation separator 2, and a steam condensate condenser 3, is raised and lowered via a movable arm 6. The suction head 5 is supported in a freely operable manner and is equipped with a cooling spout nozzle for cooling and solidifying the suction slag.The suction head 5 is automatically lowered to allow the suction head suction port 5a to flow onto the molten metal in the ladle or torpedo car 7. floating slag S
The slag S is removed by suction together with the air.
A molten metal slag removal device is configured in which slag solidified into fine particles by jetting cooling water is separated by a separator 2 together with excess cooling water and collected into a water tank 8.

9 in the figure shows the suction head suction port 5a and the slug S during the automatic lowering operation of the suction head 5.
This sensor detects the position of the top surface of the slug S as information for maintaining the distance from the top surface at an appropriate distance.

As shown in FIG. 2, there is a double-acting hydraulic cylinder 10 that raises and lowers the suction head 5 via the movable arm 6, and a pair of double-acting hydraulic cylinders that also raise and lower the suction head 5 via the movable arm 6 in an emergency. Hydraulic cylinders 11 are arranged in parallel, and an operation valve 12 for the lifting operation cylinder 10, and
By automatically operating the pilot pressure operation valve 14 for the pilot check valve 13 installed in the oil passage that becomes the oil drain side when the suction head is lowered, the information from the slag upper surface detection sensor 9 is used during the lowering operation. Based on this, the suction head 5 is automatically lowered at a set speed while maintaining the distance between the suction head inlet 5a and the upper surface of the slag S within an appropriate range, and the suction head 5 is automatically lowered at a set speed to follow the lowering of the upper surface of the slag. Based on the information from the detection sensor, when the distance between the suction head suction port 5a and the molten metal surface is reduced to the set interval (that is, when slag suction removal is completed), or when the suction When various abnormalities are detected by various sensors such as a pressure detection sensor, an ejected cooling water amount detection sensor, and an operation detection sensor of the separator 2, the suction head 5 is automatically retracted and raised.

On the other hand, when the emergency ascent cylinder 11 is in a free state in which both the ascent operation side cylinder chamber 11a and the descent operation side cylinder chamber 11b are communicated with the oil drain path 16, and from that state, only the ascent operation side cylinder chamber 11a is opened. An operation valve 18 that switches the oil path between the emergency lifting cylinder operating state and the pressure oil supply path 1 connected to the pressure oil supply path 17 and the pressure oil supply path 1 on the upstream side thereof.
7 are installed in series, and the control device 15 automatically operates the switching operation valve 18 and the pressure oil supply/intermittent valve 19 for the emergency lifting cylinder 11. The emergency lifting cylinder 11 is maintained in a free state when the suction head is lowered and stopped by the suction head 10, and the emergency lifting cylinder 11 is maintained in a free state when the suction head is raised by the lifting cylinder 10 based on information from various sensors as described above. Both of the cylinders 11 are configured to be operated in a lifting operation.

Then, an accumulator 20 that accumulates enough hydraulic pressure to raise the suction head 5 against its own weight is connected between the switching operation valve 18 and the pressure oil supply/intermittent valve 19 to generate enough pressure oil for the emergency lifting cylinder 11. An optocoder 21 is connected to the supply path 17 and detects the vertical position of the suction head 5, and also detects the descending speed of the suction head 5 from the state of change in the detected vertical position. Automatically operated by the control device 15, the switching operation valve is activated when the suction head 5 starts to descend even though the suction head is stopped, and when the descending speed becomes higher than the set control speed during the suction head lowering operation. 1
8 is switched from the emergency lifting cylinder free state to the operating state, and the emergency lifting cylinder 11 is operated to raise by the accumulated oil pressure of the accumulator 20.

Note that 22 in the figure is a check valve that prevents backflow of the hydraulic pressure accumulated in the accumulator 20.

Further, 23 is a pressure sensor that detects the accumulated oil pressure of the accumulator 20;
When the accumulated oil pressure of the accumulator falls below the set pressure, the control device 15 automatically operates the pressure oil supply intermittent valve 19 to supply the set pressure to the accumulator 20. I am trying to replenish it.

Furthermore, 24 is a pressure reducing valve that regulates the supplementary hydraulic pressure to the accumulator 20 to a set pressure, and 25 is a drain oil passage 1.
6 is in communication with the tank, and 26 is a cylinder 10 for lifting/lowering operation and a cylinder 11 for emergency lifting.
This is a pressure oil supply pump for both.

In summary, during suction head automatic lowering operation, which requires highly accurate lowering speed control due to slag suction amount control, the emergency lifting cylinder 11 is set in a free state and there is no interference from the emergency lifting cylinder 11. The suction head descending speed can be accurately controlled only by the lifting cylinder 10, and the suction head 5 may unexpectedly descend under its own weight due to a failure in the pressure oil supply structure such as the lifting cylinder 10 or the pressure oil supply pump 26. When such a situation occurs, the suction head 5 is immediately evacuated and raised by actuating the emergency lifting cylinder 11 using the accumulated oil pressure of the accumulator 20, and when the suction head is raised in a suction head operation that does not require very high speed control accuracy. By raising the emergency raising cylinder 11 together with the raising/lowering cylinder 10, further safety against the descent of the suction head due to its own weight is ensured.

[Another example]

Next, another example will be listed.

As the fluid pressure for raising and lowering the suction head, various fluid pressures such as air pressure and water pressure can be applied in addition to hydraulic pressure.

As the sensor 21 for detecting an abnormality in the fluid pressure cylinder 10 for lifting/lowering operation and the fluid pressure cylinder 10 for lifting/lowering operation due to a failure in the fluid pressure supply system of the fluid pressure supply pump 26, etc., the optocoder in the above-mentioned embodiment is used. Like suction head 5
In addition to the type of sensor that detects an abnormality in the fluid pressure cylinder 10 for lifting and lowering operations by detecting the lowering position or speed of the It is also possible to apply a type of sensor that detects abnormalities.

Various structural improvements can be made to the specific flow path switching structure for switching the emergency lifting fluid pressure cylinder 11 between a free state (first state) and a rising operating state (second state) using accumulator accumulated pressure. These switching structures are collectively referred to as the valve mechanism 18.

The specific control configuration of the control device 15 that automatically switches the valve mechanism 18 based on the information from the sensor 21 that detects an abnormality in the hydraulic cylinder 10 for lifting/lowering operation can be changed in various configurations. Instead of operating the emergency lifting fluid pressure cylinder 11 together with the lifting operation fluid pressure cylinder 10 when the operating fluid pressure cylinder 10 raises the suction head, the emergency lifting hydraulic cylinder 11 is activated only when an abnormality is detected by the abnormality detection sensor 21. 11
It may be configured to operate the lifting operation.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, with FIG. 1 being an overall structural diagram and FIG. 2 being a hydraulic circuit diagram. 5... Suction head, 10... Fluid pressure cylinder for lifting operation, 11... Fluid pressure cylinder for emergency lifting, 11a... Cylinder chamber, 15... Control device, 16... Pressure fluid discharge path, 18... Valve mechanism ,
20...accumulator, 21...sensor.

Claims (1)

[Scope of utility model registration request] A fluid pressure cylinder 10 that raises and lowers the suction head 5 for removing molten metal slag, and a fluid pressure cylinder 1 that raises and lowers the suction head 5 in an emergency.
1; and an accumulator 20 that applies accumulated fluid pressure to the emergency lifting fluid pressure cylinder 11 sufficient to raise the suction head 5 against its own weight, the molten metal slag removal device comprising:
a valve mechanism 18 that selectively switches the flow path between a first state in which the cylinder chamber 11a of the emergency lift fluid pressure cylinder 11 is communicated with the pressure fluid discharge path 16 and a second state in which the cylinder chamber 11a is communicated with the accumulator 20; , based on information from the sensor 21 that detects an abnormality in the hydraulic cylinder 10 for lifting/lowering operation, maintains the valve mechanism 18 in the first state when no abnormality is detected, and maintains the valve mechanism 18 in the second state when an abnormality is detected. A molten metal slag removal device comprising a control device 15 for switching to.