JPS59122883A - Regulator for lifting force of sweep in slag discharger - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for adjusting the lifting force of a scraper for removing slag floating in hot metal or a ladle of molten steel.

Conventionally, as shown in FIG. 1, this type of sludge removing machine has an elevating cylinder 5 and a support stand 7 fixed on a cart 8 that can move forward and backward, and this support stand 7 has a scraper plate 1 at its tip. The long arm 2 is rotatably provided via a support pin 6, and the rear end of the long arm 2 is attached to the lifting cylinder 5 via a screw 3't-.
It is known that the slurry 3P of the pot 4 is discharged by the action of the cylinder 5 and the barbs 3. However, in the operation of the above-mentioned sludge removing machine, the spring 3ri is normally extended (by the weight of the scraping plate 1 and the long arm 2), but when sludge is removed, the rctl! , the reed is in a compressed state due to the buoyant force of the slag, etc., and when the scraping plate 1 is moved to the left in Fig. 1 and hits the pot 4, the compressive repulsive force of the spring 3 causes the scraping plate 1 to rise along the pot. do.

Conventionally, (a) In normal slag removal work, the scraping plate 1 does not float due to buoyancy from the slag during slag removal, and on the other hand, when it goes over the edge of the pan 4 during slag removal, the sludge The spring 3 is used with a spring constant of such a size that the already compressed spring 3 can be further compressed by an amount commensurate with the overpass height while minimizing the impact on the machine and the pot 4.

(b) In the case of removing slag and metal attached to steel wires (the moving speed of the scraper is slower than in normal slag removal), the spring constant is A large spring 3 is required. This is because when the above-mentioned normal spring 3 is used for slag removal, the pressing force of the scraping plate 1 is weak and the scraping plate 1 escapes upward, making it impossible to remove the adhered metal etc.

(C) Therefore, when removing the slag in (a) and (b) above, the spring 3 is replaced with a spring 3 that is suitable for each, but the replacement work takes a lot of time, and the slag adhering to the steel wires. There are drawbacks such as the need for a larger pressing force to remove the particles and the need to select a spring.

Therefore, the present invention has been made to eliminate the above-mentioned drawbacks, and is designed so that when the scraping plate 1 hits the pot 4, the scraping plate 1 rises without causing an impact, or the scraping plate is not pressed against the pot. To provide a scraper lifting force adjusting device which is capable of easily and quickly adjusting the force to a desired level.

Accordingly, in the present invention, an elevating cylinder and a support stand are fixed on a cart that moves forward and backward, and a long arm having a scraper plate at the tip is rotatably provided on the support stand via a support pin, and In a working fluid pressure circuit of a lifting cylinder of a slag machine having a long arm attached to the lifting cylinder, a pressure reducing valve with a variable set pressure is provided in the middle of the pump side piping of the fluid pressure circuit via a switching valve. , a device for adjusting the lifting force of a scraper in a slag remover.

Fixing the lifting cylinder and support base on a trolley that moves back and forth.
and the working fluid pressure of the lifting and lowering cylinder of the slag scavenger, in which a long arm containing a scraper at the tip is rotatably provided on the support base via a support bottle, and the long arm is attached to the lifting cylinder. In the circuit, a pressure reducing valve with a variable set pressure is provided in the pump side piping of the fluid pressure circuit via a switching valve, and further,
A relief valve is provided in the middle of the piping on the fluid return side that operates when the scraper is raised.

This is a scraper lifting force adjustment device for a slag remover, which is characterized by the following.

The details of the apparatus of the present invention will be explained below with reference to the drawings.

FIG. 2 is a partial explanatory diagram of the present sludge removal device.

The long arm 12 has a scraping plate 11 at its tip, and the lifting cylinder 1 is fixed to a support bin 13'Yt which is fixed to a support stand 14 which is fixed to a traveling cart 16 which is movable in the sludge removal direction.
5) The scraping plate can be raised and lowered without using a spring. The traveling truck 16 has traveling wheels 17,
Driving on Lake KLS. 19 is a pot.

FIG. 3 is a circuit diagram of an example of a working fluid pressure circuit of an elevating cylinder that is constructed according to the characteristic configuration of the present invention.

20 is a hydraulic pump. The raising and lowering of the scraping plate 11 is switched by the scraping plate elevation switching valve 21. When sol, a f is excited, the scraping plate 11 rises. Further, when sol and bf are excited, the scraper plate ll is lowered. The operating pressure at that time is the pressure set in the pressure reducing valve 22. The pressure reducing valve 22 is of a type such as a proportional electromagnetic relief valve material pressure reducing valve in which the set pressure can be changed by an electric signal from the outside. The ascending speed and descending speed of the scraper plate 11 are respectively set by check valve-equipped throttle valves 24 and 25). 23 is a check valve for preventing the scraper from falling.

26 is a safety valve (relief valve) on the cylinder head side. 27 is a relief valve for setting circuit pressure.

Next, we will briefly discuss the term "nozzle assist" used in the present invention.

In the present invention, the load acting on the scraping plate when the long arm freely rotates around the fulcrum is greater than the buoyancy force that the scraping plate receives from the slab, etc., and when scraping slag, the scraping plate
Lubricate the cylinder (on the top side of the piston) so that it does not rise due to the buoyancy of slag and maintains an almost constant position.
. . . (rod side), but this pressure is used as a force to assist the scraper 11 to escape upward when the push-up blade with a buoyancy greater than the buoyancy acts from below the scraper 11. Therefore, this auxiliary state is called ``noguwa assist.''

■ In the state where the excessive scraping plate 11 mentioned above is lowered, the lifting direction of the scraping plate 11 of /15 (for example, p7 side)
Apply constant pressure to the This pressure is set so as to satisfy the following conditions.

Each lance of the force acting on the scraping plate 11 during scraping is shown in Figure 4 (7
).

W: Load Fa of the raking plate, long arm, etc. auxiliary pressure by the cylinder f: Buoyant force acting on the raking plate Then, the two lances of force are W≧Fa+f, and the cylinder piston is adjusted so that Fa satisfies this formula. Give pressure to.

■ The Δlance when the scraping plate 11 hits the green of the pot 19 is as shown in Fig. 4 (0): F: Assuming that the scraping plate receives the force from the steel wire, then F>f, Therefore, W (Fa + F), the scraping plate rises.

Such a state in which Fa is applied is referred to as a blower assist. The nozzle assist is a condition that occurs during normal slag removal work in the present invention.

Hereinafter, an example of the operation of the working fluid pressure circuit shown in FIG. 3 will be explained.

First, the non-assisted time (normal sludge removal time) will be described.

The scraper plate ii is lowered to set the scraper elevation switching valve 21 to the neutral position mf.
Then, change the set pressure of the electromagnetic pressure reducing valve 22 with a leaf valve. The set pressure is set to a high pressure within the above range of W≧Fa+f so that the scraping plate does not rise during slab scraping. In this state, the raking plate does not rise, but pressure is applied to the rod side of the cylinder 15, causing the raking plate to rise completely.

Next, when scraping the slag, if the scraping plate 11 hits the edge of the pot 19, the scraping plate 11 touches the edge of the pot 19, and the cylinder 1
With the help of the force applied to the rod side of 5, the pot 19
rises with less impact along the edges of the.

Even if the scraping plate 11 once raised is removed from the edge of the pot 19, it is maintained in its position by the check valve 23.

Next, we will discuss power assist locking (adhering slag and metal removal).

Turn on the scraper lifting force switching valve 21 f) sol and b.
and lower the scraping board. The pressure reducing valve 22 is set so that the operating pressure at this time is smaller than when the scraper 11 is raised.

Even if the scraping plate 11Xj- reaches the lower end, sol and b are kept ON. In this state, pressure is applied to the head side (opposite the rod side) of the piston of the cylinder.

When the scraper plate 11 is subjected to a downward external force, the pressure on the head side of the cylinder 15 increases, and when the increased pressure exceeds the set pressure of the relief valve 26, the working fluid escapes and the scraper plate 11 Start rising.

By setting the pressure of the relief valve 26 to a desired pressure, the pressing force of the scraper plate 11 can be made a desired pressing force. That is, when the adhesion of a slab or the like is strong, a large pressing force can be obtained by increasing the set pressure. In addition, as another embodiment, an all port block type switching valve 21' shown in FIG. 5 may be used as the ABT connection type scraper elevation direction switching valve 21.

As is clear from the explanation of the above example, according to the present invention, a. At the time of power assist, 'During scraping, the rod P side of the piston of the cylinder is Pressure can be adjusted and set.

Pressure reducing valve 2 which is the source of pressure adjustment during Nowa' assist
2 can be set as high as possible without causing the scraping plate 11 to float, and since rising pressure is acting on the scraping plate 11, the impact force when the scraping plate 11 hits the pot 19 is reduced compared to conventional devices. This makes it possible to reduce the impact exerted on the bricks of the scraping board 11 and the pot 19.

b. When the power assist lock is activated, when removing metal, slag, etc. that are strongly adhered to the pot, the pressure reducing valve can be adjusted to press the scraping board against the pot with the desired strength. This force can be applied to the cylinder, and this makes it possible to scatter cis slag, etc.

Since the nower assist and power assist locking functions are performed by the fluid pressure circuit, the lifting force of the scraper plate 11 and the pressing force can be easily adjusted in a very short time by simply changing the set pressure.

It has excellent effects such as

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram of a conventional slag removal system. Fig. 2 is a schematic explanatory diagram of the slag discharge system of the present invention, Fig. 3 is a working fluid pressure circuit diagram of the adjustment device in the slag discharge system of the present invention, Fig. 4 is an explanatory diagram of the nogwer assist, and Fig. 5 is a structural diagram of another switching valve. 11--Scraping board, 12--Long arm, 13-Support pin, 1
4...Support stand, 15...Elevating cylinder, 16...
・Dolly, 20-・Pump, 21・-Switching valve, 22-・
·Pressure reducing valve. Agent Patent Attorney Masaaki Akisawa 2nd person Mitsugai Figure 5 Figure 4 Figure (A) Dimension 4 Figure (B)

Claims (1)

[Scope of Claims] (11) An elevating cylinder and a support stand are fixed on a cart that moves back and forth, and a long arm having a scraper plate at the tip is rotatably provided on the support pin via a support pin. In the working fluid pressure circuit of the lifting cylinder of the slag machine in which the long arm is attached to the lifting cylinder, a pressure reducing valve with a variable set pressure is provided in the middle of the pump side piping of the fluid pressure circuit via a switching valve. ,
A scraping board lifting force adjustment device for a slag remover, characterized by: (2) An elevating cylinder and a support stand are fixed on a trolley that moves forward and backward, and a long arm with a scraper plate at the tip is rotatably provided on the support stand via a support beam; In the working fluid pressure circuit of the lifting cylinder of the slag machine in which the arm is attached to the lifting cylinder, a pressure reducing valve with a variable set pressure is provided in the middle of the pump side piping of the fluid pressure circuit via a switching valve, and further, A scraper lifting force adjustment device for a slag remover, characterized in that a relief valve is provided in the middle of a piping on the working fluid return side when the scraper is raised.