JPS6141965B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a method and apparatus for welding studs on the inside of a blast furnace shell, which can be effectively used for repairing the furnace wall of a blast furnace, particularly a portion of the furnace wall that is severely damaged.

Prior Art As is well known, the furnace wall of a blast furnace is constructed by constructing a refractory inside the furnace shell to form a lining layer, and embedding a box-shaped cooling disk or a stave cooling disk in the lining layer. It is common to do so. However, the lining layer gradually wears out over time. As the wear progresses, the cooling plate may become exposed from the lining layer and break, or the heat load on the steel shell will increase, causing hot spots. In particular, when the cooling plate is damaged, the thermal load on the lining layer increases at an accelerated rate, and its wear rate increases significantly.As a result, the steel shell often becomes exposed, causing cracks and damage to the steel shell. The situation was such that it caused problems.

When the wear of the lining layer progresses, methods such as spraying monolithic refractories from inside the furnace to repair the lining layer, inserting a cooling plate into the worn part, or sprinkling water on the steel shell can be used. Measures were being taken to strengthen the cooling of the furnace walls.

However, because there is no support mechanism for the refractory on the inner surface of the lining layer or inside the steel shell, the sprayed refractory peels off and falls off in a short period of time, making it impossible to achieve sufficient effects. . For this reason, various stud structures and their mounting methods have been proposed in the past in order to provide a refractory support mechanism inside the steel shell.

However, as is well known, many pipes and equipment are installed in a narrow space near the furnace wall, and workers cannot crawl into the furnace, so conventional methods require a long time to install them. In addition, there were many restrictions on the structure of the stud, making it impossible to provide a reliable support mechanism for the refractory.

Purpose The present invention solves the problems of the prior art, and the first object is to provide a method for quickly and reliably attaching a stud that exhibits an excellent support function for refractories.
A second object is to provide an effective device for attaching said studs.

Configuration/Example The configuration of the present invention will be described based on figures showing examples.

FIG. 1 is a partial sectional view of a blast furnace wall showing an embodiment of the stud welding method according to the present invention.

In the figure, 1 is an iron shell and 2 is a refractory. In this embodiment, an arm insertion hole (hereinafter referred to as the "insertion hole") 3 is drilled in the iron skin 1 at the exposed part of the iron skin after the refractory 2 falls off, and the robot arm 100 is inserted through the insertion hole 3. The robot arm 100 is equipped with a welding mechanism holder (hereinafter referred to as a holder) 101 at its tip, and is configured to be bendable at at least two joints so that the holder 101 can face each other on the inner surface of the iron skin.

FIGS. 2 to 4 are structural diagrams showing one embodiment of the robot arm 100. In the figure, 10
Reference numeral 2 denotes an arm, which is formed hollow so that a push rod 103, which will be described later, can move freely back and forth inside the arm. The arm 102 is attached to the rear of the arm 102.
A handle 104 is fixed for easy rotation. Further, a joint pin 105 is provided at the distal end of the arm 102, and a joint arm 106 is rotatably connected via the joint pin 105. In this embodiment, a protruding arm 102a is formed at the tip of the arm 102, and an insertion hole 107 is provided at the tip of the protruding arm 102a as shown in FIG. Joint pin 1
05 is inserted and fixed. In addition, the articulated arm 106 of this embodiment has a rear plate-like side plate 106.
a and a protrusion member 106c protruding from the tip via an annular member 106, and the side plate 1
By passing the joint pin 105 through the hole 106d provided in the arm 10
2 is rotatably connected. Guide grooves 108 are bored on both sides of the side plate 106a. As shown in FIG. 6 (cross section BB in FIG. 2), a connecting shaft 109 is mounted in the guide groove 108 across both side plates 106a. The connecting shaft 109 pivotally supports the tip of the push rod 103 and the rear end of the connecting rod 110, and freely moves back and forth in the guide groove 108.
In FIG. 6, reference numeral 111 indicates a pin for preventing the connecting shaft 109 from coming off.

Now, the protruding member 1 at the tip of the articulated arm 106
06c has an insertion hole 11 similar to the arm 102.
2 is provided, a second articulation pin 113 is inserted therethrough, and the holder 101 is rotatably connected via the second articulation pin 113. Holder 10
1 is connected to the connecting rod 1 via a connecting pin 114.
Ten tips are connected. One-sided push rod 1
03 is inserted into the arm 102, its tip is pivotally supported by the connecting shaft 109 as described above, and its rear part is configured to protrude from the arm 102 by a predetermined length.

Next, the operating mechanism of the robot arm 100 will be explained.

In Figure 2, pull the push rod 103 to the rearmost position,
The robot arm 100 is shown in a linearly extended state (hereinafter referred to as the extended state), and is inserted through the insertion hole 3 of the steel shell 1 in the extended state. Next, when the push rod 103 is pushed forward, the connecting shaft 109 moves forward along the guide groove 108, and along with this, the connecting rod 110 pivotally supported by the connecting shaft 109 moves forward.
also move forward. When the connecting rod 110 moves forward, the third
As shown in the figure, the retainer 101 is attached to the second joint pin 1.
13 as a pivot point. Therefore, for example, a stopper 115 is installed at the bottom of the tip of the articulated arm 106.
If the holder 101 is configured to abut against the stopper 115 in a state substantially orthogonal to the linear axis 116, the holder 101 will be attached to the articulated arm 106.
It can be held fixed in the orthogonal state. (Hereinafter, the state shown in FIG. 3 will be referred to as the orthogonal state.) When the push rod 103 is further pushed out from the orthogonal state, the joint arm 106 is bent with the joint pin 105 as a pivot point, as shown in FIG. Tip surface 1
01a is rotated 180° from the extended state in Figure 2,
Opposed to the inside of the iron skin. (The state shown in FIG. 4 will be referred to as the bent state hereinafter.) In the bent state, the push rod 103 and the arm 1 are held together by the lock nut 117, for example.
If 02 is fixed, that state can be maintained without continuing to apply forward force to the push rod 103. Further, when the handle 104 is rotated in the bent state, the holder 101 rotates around the linear axis 116, and the tip surface 101a can be opposed to any arbitrary position of the steel shell 1.

In this embodiment, the connecting shaft 109 and the connecting pin 11 are rotated using the joint pins 105 and 113 as pivot points.
4 moves in a rotational trajectory, the push rod 103 and connection rod 110 are connected to them.
When moving forward and backward, it also moves up and down. Therefore, the push rod 103 and the connecting rod 11 are prevented from coming into contact with the arm 102 or the annular member 106b of the articulated arm 106 during the vertical movement.
0 was constructed by appropriately bending.

Now, FIG. 7 is a cross-sectional structural diagram showing one embodiment of the welding mechanism 4 held by the holder 101.

The welding mechanism of this embodiment includes a welding gun 41, a chuck 42 that is attached to the tip of the welding gun 41 and holds the stud 5 with a predetermined holding force, and an adsorption coil 4.
It is composed of 3. The welding gun 41 is normally pushed forward by the elastic force of the spring 44, but when the attraction coil 43 is energized, the welding gun 41 is moved back a predetermined amount by the attraction action of the coil. 45 is the adsorption coil 4
3, and 46 is a welding cable for the welding gun 41. Further, in this embodiment, a spacing fitting 47 is attached via an adjustment rod 48 to ensure a precise spacing between the stud 5 and the surface of the steel shell, which will be described later. The spacer 47 is adjusted so that its tip end surface 47a substantially coincides with the tip end position of the stud 5.

Fig. 8 shows the state in which the stud 5 is brought into contact with the inner surface of the steel shell, and the situation inside the furnace is observed by moving the holder 101 forward (in the direction of arrow a) until the spacing retainer 47 touches the shell 1. The stud 5 can be accurately brought into contact with the surface of the steel shell without causing any damage. Next, when the adsorption coil 43 is energized via the energizing cable 45, the stud 5 is moved back by a predetermined amount as shown in FIG. 9, and a gap g is formed between the tip and the surface of the iron skin. In this state, when the welding gun 41 is energized via the welding cable 46, an arc is generated at the tip of the stud, and the stud 5 is welded to the steel shell 1 by the heat of the arc. When the welding is performed, the stud 5 is firmly fixed to the steel shell 1, so when the holder 101 is retreated, the stud 5 is separated from the chuck 42, and the stud welding work is completed.

As described above, in the present invention, first, the robot arm 100 with the stud 5 installed at its tip is inserted through the insertion hole 3 of the steel shell 1, and then the push rod 103 is pushed in to move the robot arm 100 in the furnace as shown in FIG. is in a bent state. Next, handle 10
4 to make the holder distal end surface 101a face a predetermined position inside the steel shell, and at the same time pull back the handle 104, the holder 101 advances toward the inside of the steel shell, and the stud 5 can be welded. can. When the welding of the stud 5 is completed, the push rod 103 is retracted and the robot arm 100 is extended.
Take it out of the furnace. In addition, in FIG. 1, 6 is a power supply device.

Incidentally, on the inner surface of the iron shell 1, charges and molten materials often adhere, and the refractory material 2 often remains scattered or in a thin layer. When welding the studs 5, it is necessary to remove the various deposits and keep the surface of the iron shell clean. Therefore, in the present invention, the welding area is cleaned before stud welding. This cleaning can be efficiently carried out, for example, by attaching a cleaning tool, which will be described later, to the holder 101 of the robot arm 100. 10 shows a state in which a well-known air hammer 7 is attached to a holder 101, and FIG. 11 shows a state in which a scraping tool 8 with a protruding scraping claw 8a is attached to the holder 101. Cleaning can be accomplished by dropping the deposits or by rotating the robot arm 100 and scraping off the deposits with the scraper 8. Cleaning can also be carried out by attaching the injection nozzle 9 to the holder 101 and spraying compressed gas as shown in FIG. 12, or by mixing sand or metal pieces into the compressed gas and blasting. It is.

Effects By implementing the present invention, the studs 5 can be firmly welded to the steel shell 1, and the time required for stud welding can be extremely shortened and can be easily performed.
For this reason, the lining layer repaired by spraying or press-fitting the monolithic refractory into the stud welds can now exhibit a stable protective function for a long period of time due to the support mechanism of the studs 5.

[Brief explanation of the drawing]

Each figure shows an embodiment based on the present invention.
The figure is a cross-sectional structural diagram showing the state of stud welding. Figures 2 to 4 are structural diagrams of the robot arm. Figure 2 is the extended state, Figure 3 is the orthogonal state, Figure 4 is the bent state, and Figure 5 is the structural diagram of the robot arm. is a cross-sectional view taken along line A-A in Figure 2, Figure 6 is a cross-sectional view taken along line B-B in Figure 2, Figure 7 is a structural diagram of the welding mechanism held in the holder, and Figures 8 and 9 are cross-sectional views of the stud. Partially enlarged view showing the contact situation with the steel shell, No. 10
11 and 12 are structural diagrams showing different embodiments of the cleaning tool. 1... Iron skin, 2... Refractory, 3... Insertion hole, 4
... Welding mechanism, 41 ... Welding gun, 42 ... Chack, 43 ... Adsorption coil, 44 ... Spring, 45 ... Current-carrying cable, 46 ... Welding cable, 47 ... Spacing connection fitting, 48 ... ... Adjustment rod, 5 ... Stud, 6 ... Power supply device, 7 ... Air hammer, 8 ... Scraping tool, 9 ... Injection nozzle, 100 ... Robot arm, 101 ... Holder, 102 ... Arm , 103...Insert rod,
104...Handle, 105...Joint pin, 10
6... Joint arm, 107... Insertion hole, 108...
... Guide groove, 109 ... Connection shaft, 110 ... Connection rod, 111 ... Stopper pin, 112 ... Insertion hole, 113 ... Second joint pin, 114 ... Connection pin, 115 ... Stopper, 116...Linear shaft core, 117...Lock nut.

Claims (1)

[Scope of Claims] 1. At least 2 arm insertion holes provided in the blast furnace shell, and a welding mechanism holder provided at the tip of the insertion hole.
Insert a robot arm with more than one joint,
Next, the robot arm is bent until the distal end surface of the welding mechanism holder faces the inner surface of the steel shell, and then the stud held by the welding mechanism holder is welded to the inside of the steel shell. A stud welding method for the inside of a blast furnace shell. 2. The method for welding studs on the inside of a blast furnace shell according to claim 1, characterized in that the welding area is cleaned in advance before welding the studs. 3. A hollow arm having a joint pin at the tip and a rotating handle at the rear; having guide grooves on both sides and having a second joint pin at the tip; a joint arm rotatably connected to the arm; a welding mechanism holder rotatably connected to the joint arm via the second joint pin; a connecting shaft supported in the guide groove; a connecting rod whose tip is connected to the holder via a connecting pin and whose rear end is pivotally supported by the connecting shaft; and a push rod which is inserted into the arm and whose tip is pivotally supported by the connecting shaft. A robot arm device characterized in that it is configured to be bendable using the two joint pins as pivot points.