JPH0519168Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to an automatic air-bleeding device for a pneumatic dummy bar used in continuous casting equipment when a slab is pulled out of a mold through a roll unit in the initial stage of casting.

(Prior art) In continuous casting equipment, a pair of upper and lower molds is connected so as to be flexible in the longitudinal direction, and is used as a dummy bar to guide the slab pulled out from the mold in the initial stage of casting. A so-called air type dummy bar is known which has a structure in which a bladder is interposed between a mold and a lower mold, and air is sealed in the bladder to change the thickness.

Conventionally, air is sealed in the bladder of this pneumatic dummy bar when it is installed in the mold, and the air is removed after the slab is pulled out and immediately before being loaded onto the dummy bar charging car. Since air is sealed in the dummy bar, the flexibility of the dummy bar is suppressed and the dummy bar is held in a shape close to a straight line, which causes various problems.

Therefore, in order to solve these problems, the present applicant developed an air-type dummy bar separation and collection mechanism and filed an application (Utility Application No. 1982-2267). In the air-type dummy bar automatic air-bleeding device in the air-type dummy bar separation and recovery mechanism of this earlier application, the pusher rod of the pushing device pushes the push plate of the tail portion of the dummy bar inward, and the self-closing valve is activated via the actuating lever and the actuating pin. The valve opens, and the push rod of the pressing device returns after opening, so in order to maintain this valve open state, a lock lever having a helical spring wound around the pivot, which is the pivot point, is pressed against the operating lever. It is something.

(Problem to be solved by the invention) By the way, in the above-mentioned automatic air bleeder for the pneumatic dummy bar, the push rod of the pushing device pushes the pushing plate, this pushing plate pushes the actuating lever, and this actuating lever pushes the actuating pin. Since the actuating pin is configured to be pushed in, the amount by which the actuating pin is pushed can be adjusted by adjusting the distance between the pushing plate and the pushing device, but this is not a reliable means of adjustment, so it takes time to adjust, and the distance is adjusted to be shorter. If the distance is adjusted to be too long, the self-closing valve will not operate and the air from the dummy bar will not be able to escape. Problems may occur from time to time.

(Means for Solving the Problems) The present invention has been made to improve the above problems, and its gist is to connect a pair of upper molds and lower molds so that they can be bent in the longitudinal direction. In addition, a self-closing valve provided at the end of a conduit communicating with the bladder is provided inside the tail portion of the pneumatic dummy bar having a bladder that can seal air between the upper mold and the lower mold, and this self-closing valve. a valve opening actuation rod which is provided at a position opposite to the valve opening/closing direction and opens the self-closing valve; a swinging arm which moves the valve opening actuation rod back and forth with respect to the self-closing valve; A push rod is provided that has a stepped portion for moving the push rod forward by a predetermined amount and then slides with respect to the swinging arm to advance the predetermined amount. This is an automatic air bleeder for a pneumatic dummy bar, which is equipped with a swingable push plate that moves the push bar forward by pressing the end.

(Embodiments) Hereinafter, embodiments of the present invention will be described based on the drawings.

In FIGS. 1 to 4, reference numeral 1 denotes the lower mold of the dummy bar tail, and inside thereof there is a hole 6 having an opening 4 and an opening 5 in a part of the right side wall 2 and bottom 3, respectively. It is formed by machining. This hole 6 is equipped with an air-type dummy bar automatic air bleed device having the configuration described below. In the following explanation, left and right will be referred to as the left and right as they were in FIG.

7 is a push plate having a size that substantially closes the opening 4 of the right side wall 2. One end of the push plate 7 is rotatably provided on the front wall 8 with a pin 9, and the opposite end has a receiving hole 12 for a spring-loaded lock pin 11 provided on the rear wall 10. Normally, the lock pin 11 is pushed into the receiving hole 12 to control the opening and closing of the push plate 7. Further, a bracket 14 having a long hole 13 formed in the center is welded and fixed to the inner surface of the push plate 7.

Reference numeral 15 designates a push rod having a fork 18 having a small diameter portion 16 on the left side and a pin hole 17 on the right end. A small diameter portion 16 and a large diameter portion 19 of this push rod 15
are the middle stages 20, 2 of the front wall 8 and rear wall 10 of the hole 6.
Holes 23 are formed in the first block 21 and the second block 22, which are fixed on the left and right sides with a predetermined interval between them.
24 via flange bushes 25 and 26 so as to be slidable. On the other hand, the fork 18 at the right end of the push rod 15 can be slid up and down within the elongated hole 13 of the bracket 14 by passing a pin 27 through the pin hole 17 of the fork 18 and the elongated hole 13 of the bracket 14 of the push plate 7. attached. In addition, 28 is
This is a stopper provided at the left end of the push rod 15 to prevent the push rod 15 from coming off.

29 is a conduit 3 communicating with a bladder (not shown)
This is a valve opening operating rod for opening the self-closing valve 31 provided at the end of the valve. In the middle part of this valve opening actuating rod 29, support shafts 32, 32 are provided at the front and rear.
A block 35 having a spring receiver 33 at the left end and a left-right through hole 34 in the center is welded and fixed by passing an operating rod 29 through the through hole 34, and a compression spring 36 on the left side of the spring receiver 33. The flange bushing 37 that serves as the spring holder on the left side
is provided so as to penetrate through the actuating rod 29. Further, the actuating rod 29 has its left and right ends passed through holes 38 and 39 provided directly below the holes 23 and 24 provided in the first block 21 and the second block 22, respectively.

40, a pair of arms 45, 46 having through holes 43, 44 at the upper end and the middle part are erected at the front and rear ends of a cylindrical base 42 having a pin hole 41 in the axial center, respectively. This is a swinging arm having a configuration in which a roller 47 is supported by a pin 48 between through holes 43, 43 at the upper ends of 45, 46. The cylindrical base 42 of the swinging arm 40 has a pin hole 41 drilled through the rear wall 10 near the bottom of the front wall 8 and the rear wall 10 up to the front wall 8.
The roller 47 is fixed so as to be swingable by a pin 50 mounted through the push rod 15 so that the upper surface of the roller 47 comes into contact with the small diameter portion 16 side of the boundary between the small diameter portion 16 and the large diameter portion 19 of the push rod 15 . Further, the support shaft 32 of the block 35 of the valve opening actuation rod 29 is inserted into the through holes 44, 44 in the intermediate portions of the pair of arms 45, 46.
32 is loosely fitted, and the compression spring 36 is slightly inserted between the spring receiver 33 of the block 35 and the spring receiver flange bush 37 which is supported in contact with the right end surface of the hole 38 of the first block 21. It is designed to be compressed and supported.

Reference numeral 51 denotes an upper die corresponding to the lower die 1 of the dummy bar tail portion, which functions as a cover for the hole 6.

Reference numeral 52 denotes a position adjustment bolt that comes into contact with the right end surface of the actuating rod 29 and is screwed to the right side wall 2.

53 is a lid of the opening 5 of the bottom 3.

The movement of the automatic air bleed device for the pneumatic dummy bar constructed in this way is such that the push rod (not shown) of the pushing device protrudes from the right side and pushes the pushing plate 7 into the receiving hole 12 of the pushing plate 7. The push rod 15 is rotated and pushed into the opening 4 against the spring force of the lock pin 11 located therein. By this pushing, the push rod 15 is pushed into the fork 18 at the right end of the push rod 15.
The first block 21 is slid upward through the long hole 13 of the bracket 14 of the push plate 7 via the pin 27.
and the second block 22 in the flange bushes 25 and 26 of the holes 23 and 24, respectively. As the push rod 15 slides to the left, a roller 47 provided on the swinging arm 40 is in contact with the lower part of the small diameter portion 16 side of the boundary between the small diameter portion 16 and the large diameter portion 19 of the push rod 15. is pushed down to the left by the diameter difference between the small diameter and the large diameter, and the swing arm 4
0 tilts to the left around pin 50. At the same time, as the swinging arm 40 tilts to the left, the valve opening valve fixed to the block 35 is moved through the support shafts 32, 32 of the block 35 loosely fitted into the through holes 44, 44 of the swinging arm 40. The actuating rod 29 moves a predetermined distance to the left against the spring force of the compression spring 36 to reliably open the self-closing valve 31 located slightly apart from its left end. By opening the valve, air inside the bladder is removed through the conduit 30.

In the above embodiment, the leftward tilting mechanism of the swinging arm 40 includes a push rod 15 having a circular cross section and a small diameter portion 16 and a large diameter portion 19, and a boundary between the small diameter portion 16 and the large diameter portion 19. Although a device configured with a roller 47 provided on a swinging arm 40 that comes into contact with the lower side of the small diameter portion 16 of the push rod 15 is illustrated, the present invention is not limited to this configuration. The shape may be square instead of circular, and the small diameter portion 16 and large diameter portion 19 of the push rod 15 may alternatively have a shape with a step on the lower surface of the push rod 15. The roller 47 provided on the movable arm 40 may be a sliding plate instead.

(Effect of the invention) As described above, according to the invention, the swinging arm is tilted by a predetermined amount by the stepped portion of the push rod, and thereby the actuating rod is moved a predetermined distance. The blockage valve can be opened reliably, and therefore troubles such as air not being able to escape from the dummy bar are eliminated, and the workability of recovering the dummy bar is significantly improved.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway front view of an automatic air bleeder for a pneumatic dummy bar showing an embodiment of the present invention, Fig. 2 is a cross-sectional view taken along line C-C in Fig. 1, and Fig. 3 is A in Fig. 2. -A sectional view, and FIG. 4 is a BB sectional view of FIG. 1... Lower mold of dummy bar tail part, 7... Push plate, 14... Bracket, 15... Push rod, 16
... Small diameter part, 19 ... Large diameter part, 21 ... First block, 22 ... Second block, 28 ... Stopper, 29 ... Valve opening actuation rod, 31 ... Self-closing valve, 30 ... Pipe line communicating with the bladder, 32...Support shaft, 33...Spring receiver, 35...Block, 3
6... Compression spring, 37... Flange bush serving as a spring holder, 40... Swinging arm, 42... Cylindrical base, 45, 46... Arm, 48, 50...
Pin, 51... Upper mold.

Claims (1)

[Scope of utility model registration request] A pair of upper molds and lower molds are connected to each other so as to be flexible in the longitudinal direction, and the inside of the tail portion of the pneumatic dummy bar has a bladder capable of sealing air between the upper mold and the lower mold, and communicates with the bladder. a self-closing valve provided at the end of a pipeline to be opened; a valve-opening actuating rod that is provided at a position opposite to the self-closing valve in the valve opening/closing direction and that opens the self-closing valve; Provided with a swinging arm that moves back and forth with respect to the blockage valve, and a push rod having a stepped portion for moving the swinging arm forward a predetermined amount and then sliding with respect to the swinging arm to advance the predetermined amount, An automatic air bleeder for a pneumatic dummy bar, characterized in that an opening is provided in the peripheral wall of the tail part, and a push plate is swingably provided in the opening to press the rear end of the push rod and move the push rod forward. Device.