JPH0721251U - Fireproof plate fixing structure for sliding gate device - Google Patents

Abstract

(57) [Summary] [Purpose] To improve the cotter type fixing structure so that the cotter does not become loose. [Structure] The fire-resistant plate 1 is arranged in the frame of the metal frame 3, and a holding metal fitting 4 is applied to an outer edge portion of a predetermined portion of the fire-resistant plate 1, so that the action portion 6 provided on the holding metal fitting 4 and the metal frame 3 are attached. The cotter 8 is press-fitted in the space between the fulcrum 7 and the fulcrum 7, so that the outer edge of the fireproof plate 1 is pressed by the holding metal fitting 4 to firmly fix the fireproof plate 1 in the metal frame 3. Elastic biasing means 11 is added between the pressing metal fitting 4 and the metal frame body 3 so as to constantly bias the pressing metal fitting 4 in a direction opposite to the displacement direction of the pressing metal fitting 4 due to press fitting of the cotter 8. did.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to improvement of a fireproof plate fixing structure for fixing a fireproof plate, which is a main component of a sliding gate device for opening and closing a molten steel outlet, to a metal frame.

[0002]

[Prior art]

 As is well known, a sliding gate device is provided at the outlet of a molten steel container and is driven by an actuator such as a hydraulic cylinder to open and close the molten steel outlet. Its main components are two plates of refractory bricks. One of the refractory plates is a fixed plate fixed to the molten steel container side, and the other refractory plate is a movable plate attached to a slide member driven by the actuator. Both of them are combined so that the movable plate overlaps the outer surface of the fixed plate, and the movable plate is slid along the fixed plate. A hole that serves as a passage for molten steel is formed in the center of both plates, and the state where the positions of the holes in both plates are completely different is the closed state, and the movable plate is placed so that both holes match. When it is displaced, it opens.

More specifically, a refractory brick cylinder (inner nozzle) communicating with a molten steel container is bonded and bonded with refractory mortar on the inner surface side of the hole position of the fixed plate. A cylindrical refractory brick (collector nozzle), which opens to the outside, is adhesively bonded to the outer surface of the position with refractory mortar.

Further, the fixing plate is firmly fixed to a metal frame body surrounding the outer edge portion thereof, and is fixed to the molten steel container via the metal frame body. A similar metal frame is also provided on the slide member side, and the movable plate is firmly fixed in the frame. By firmly fixing the refractory plate from the outer peripheral side with a metal frame that serves as a mounting pedestal in this way, it is possible to prevent damage to the joint between the refractory plate and the refractory brick cylinder and to prevent the heat when molten steel passes through. It is possible to prevent the expansion of cracks generated around the hole due to the impact. If the joint is damaged or the crack spreads, the molten steel leaks to the outside, so such a situation must be reliably prevented for safe operation.

FIG. 1 shows two typical conventional examples of a structure in which a refractory plate is fixed to a metal frame. In this example, the refractory plate 1 has an oval outer shape, and a small circular hole 2 is formed in the substantially central portion. The metal frame 3 has a rectangular frame larger than the fireproof plate 1, and one of the short sides of the frame is an inner surface of an arc corresponding to the outer arc of the fireproof plate 1. A metal fitting 4 is attached to the inside of the other short side of the metal frame 3. The holding metal fitting 4 is guided by the two long sides of the frame 3 and is displaceable in the long side direction, and one side surface thereof has an arc surface corresponding to the outer shape arc of the fireproof plate 1. As shown in the figure, the arcuate surface on the left side of the fireproof plate 1 is applied to the arcuate surface on the inner side of the left short side of the metal frame body 3, and the arcuate surface on the right side faces the arcuate surface of the holding metal fitting 4.

FIG. 1A shows a bolt type fixing structure. A screw hole is formed in the central portion of the short side of the metal frame body 3 near the holding metal fitting 4, and a bolt 5 is screwed into the hole. As the bolt 5 is screwed in, the tip of the bolt abuts the side surface of the retainer fitting 4 and pushes it to the left. As a result, the fireproof plate 1 is strongly tightened by the left short side of the metal frame 3 and the holding metal fitting 4, and is firmly fixed to the metal frame 3.

FIG. 1B shows a cotter type fixed structure. A rod-shaped convex portion 6 is integrally formed in the central portion of the right side surface of the holding metal fitting 4, and the tip side of the convex portion 6 penetrates through a hole formed in the short side portion of the metal frame body 3 to the outside. It is protruding. A cotter receiving portion 7 is integrally attached to the metal frame 3 so as to face the right side of the tip of the convex portion 6. The cotter 8 is press-fitted (inserted and driven) into the gap between the cotter receiving portion 7 and the tip of the convex portion 6. Then, the holding metal fitting 4 is strongly pushed to the left side according to the taper of the cotter 8, and as a result, the fireproof plate 1 is strongly tightened by the left short side of the metal frame body 3 and the holding metal fitting 4 to be firmly fixed to the metal frame body 3. Fixed.

[0008]

[Problems to be solved by the device]

 Although the sliding gate device is used in an environment with high temperature and a lot of dust, the bolt type fixing structure of Fig. 1 (A) has a problem that the bolt 5 is easily fixed due to the influence of high temperature and dust. The worker requires a great amount of force to rotate the bolt 5 and is heavy labor, and even if the bolt 5 is intended to be tightened, it is not sufficiently tightened and the fire-resistant plate 1 is not fixed sufficiently. If the fixed bolt 5 is turned over, the thread will be worn, and in extreme cases, the thread strength may be insufficient and the bolt 5 may come off.

In the cotter type fixing structure of FIG. 1B, the cotter 8 does not stick to the cotter 8 and the workability is good. However, there is a problem that the cotter 8 is likely to come loose due to the difference in thermal expansion between the refractory brick and the metal. The loosened cotter 8 may fall off, and if it does fall off, the fixing force of the fireproof plate 1 will be lost, so it is more dangerous than the bolt type.

Japanese Patent Laid-Open No. 61-159258 discloses a structure in which the cotter is displaced by a screw feeding mechanism to fix the refractory plate to the metal frame. This is an extremely complicated structure, and it is difficult to achieve the expected operation due to the screw feed mechanism sticking in a high temperature and bad dust environment.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to provide a fireproof plate fixing structure in which the cotter is prevented from being loosened by improving the cotter type fixing structure described above. Especially.

[0012]

[Means for Solving the Problems]

 Therefore, in this invention, the fireproof plate is arranged in the frame of the metal frame body, and the holding metal fitting is applied to the outer edge portion of the predetermined portion of the fireproof metal plate, and the action portion provided on the holding metal fitting and the metal frame body are provided. A cotter-type fixing structure that presses a cotter into the space between the fulcrum part and the outer edge of the refractory plate with the pressing fitting to firmly fix the refractory plate in the metal frame. An elastic biasing means is added between the pressing metal member and the metal frame body so that the pressing metal member is always biased in a direction opposite to the displacement direction of the pressing metal member when the cotter is press-fitted.

[0013]

[Action]

 Since the elastic biasing means constantly applies an urging force to the pressing metal fitting in a direction opposite to the displacement direction of the pressing metal fitting due to the press-fitting of the cotter, a difference in thermal expansion between the fireproof plate and the metal fittings is caused. Even if the cotter becomes loose, the elastic biasing force exerts a certain amount of pressure on the tapered surface of the cotter, so that the cotter does not loosen or fall off.

[0014]

【Example】

 FIG. 2 shows a fireproof plate fixing structure according to an embodiment of the present invention. The basic structure thereof is the same as the cotter type fixing structure of FIG. 1B described in detail above. In this example, the refractory plate 1 has an oval outer shape, and a small circular hole 2 is formed in the substantially central portion. The metal frame 3 has a rectangular frame larger than the fireproof plate 1, and one of the short sides of the frame is an inner surface of an arc corresponding to the outer arc of the fireproof plate 1. A holding metal fitting 4 is assembled inside the other short side of the metal frame body 3. The holding metal fitting 4 is guided by the two long sides of the frame 3 and is displaceable in the long side direction, and one side surface thereof has an arc surface corresponding to the outer shape arc of the fireproof plate 1. As shown in the figure, the arc surface on the left side of the fireproof plate 1 is applied to the arc surface on the inner side of the left short side of the metal frame body 3, and the arc surface on the right side faces the arc surface of the holding metal fitting 4.

A rod-shaped convex portion 6 is integrally formed at the center of the right side surface of the holding metal fitting 4, and the tip side of the convex portion 6 penetrates a hole formed in the short side portion of the metal frame body 3. It sticks out. A cotter receiving portion 7 is integrally attached to the metal frame body 3 so as to face the right side of the tip of the convex portion 6. The cotter 8 is press-fitted (inserted and driven) into the gap between the cotter receiving portion 7 (fulcrum portion) and the tip of the convex portion 6 (working portion). Then, the pressing metal fitting 4 is strongly pushed to the left side according to the taper of the cotter 8, and as a result, the fireproof plate 1 is strongly tightened by the left short side of the metal frame 3 and the pressing metal fitting 4 to be firmly fixed to the metal frame body 3. To be done.

In this embodiment, the elastic biasing means is attached with the following structure. In the right short side portion of the metal frame body 3, two small holes 9 are formed on both sides of the hole through which the convex portion 6 penetrates, and the spring support rod 10 penetrates through this hole 9. One end of the rod 10 is screwed and fixed in the screw hole of the press fitting 4. A flange 10a is integrally attached to the other end of the rod 10, and a spring 11 set around the right protruding portion of the rod 10 is compressed between the outer surface of the metal frame 4 and the flange 10a. There is.

Therefore, the elastic force of the spring 11 always acts in the direction of pulling the rod 10 to the right. That is, when the cotter 8 is press-fitted, the holding metal fitting 4 is displaced leftward, but the elastic force of the spring 11 always acts in the direction of displacing the holding metal fitting 4 right. Therefore, even if the reaction force does not act from the fireproof plate 1 to the holding metal fitting 4, the elastic force of the spring 11 does not lose the force for pinching the cotter 8 between the convex portion 6 and the cotter receiving portion 7. .

[0018]

[Effect of device]

 As described above in detail, in the fireproof plate fixing structure of the present invention, the elastic biasing means constantly applies an urging force in the direction opposite to the displacement direction of the presser fitting due to the press fit of the cotter. Even if the cotter is loosened due to the difference in thermal expansion between the refractory plate and the metal fittings, a certain amount of pressure acts on the tapered surface of the cotter due to the elastic biasing force, and therefore the cotter is loosened. , There is no dropout.

[Brief description of drawings]

FIG. 1 Conventional bolt type (A) and cotter type (B)
FIG. 3 is a schematic configuration diagram of the refractory plate fixing structure of FIG.

FIG. 2 is a schematic configuration diagram of a fireproof plate fixing structure according to an embodiment of the present invention.

[Explanation of symbols]

 1 Fireproof Plate 3 Metal Frame 4 Holding Metal Fitting 5 Bolt 6 Convex Part (Operating Part) 7 Cotter Receiving Part (fulcrum) 8 Cotter 10 Spring Support Rod 11 Spring

Claims (1)

[Scope of utility model registration request] 1. A fireproof plate is arranged in a frame of a metal frame body, and a holding metal fitting is applied to an outer edge portion of a predetermined portion of the metal plate, and an operating portion provided on the holding metal fitting and the metal frame body are provided. By pressing the outer edge of the fireproof plate by pressing the cotter into the space between the fulcrum and the press fitting, the fireproof plate is firmly fixed in the metal frame body, the cotter A sliding gate device characterized in that an elastic urging means is added between the pressing metal member and the metal frame body so that the pressing metal member is constantly urged in a direction opposite to the displacement direction of the pressing metal member by press fitting. Fireproof plate fixing structure.