JPH0735995U - Stud - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a stud bolt which can easily be engaged with a nut. [Structure] A stud bolt (2) having a threaded portion (2a) formed therein, which is a stud bolt (2) planted on the inner surface of a furnace shell via a base end portion for attaching an inorganic fiber block (3) to the furnace shell (1). When the nut 7 is screwed into the threaded portion, the nut is tapered by the taper portion 2c which is continuously provided at the tip end of the Guide by facing the screw part.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a stud bolt that is planted on the inner surface of a furnace shell via a base end portion in order to attach an inorganic fiber block formed by molding inorganic fibers such as ceramic fibers into a furnace shell.

[0002]

[Prior art]

 Conventionally, this type of stud bolt has a threaded part formed on the outer circumference of a round bar of uniform thickness such as heat resistant steel, and has a length of about 1/5 to 1/2 of the thickness of the inorganic fiber block. have. In order to construct the furnace wall of various industrial furnaces by using the stud bolts and the inorganic fiber block, etc., as shown in FIG. 3, a large number (only one in the figure is provided on the inner surface of the furnace shell (iron skin) 31 in advance. The stud bolts 32 (shown) are planted at required intervals by welding through the respective base ends (outside of the furnace), and the inorganic fiber blocks 33 are attached to the stud bolts 32, respectively. Structure in which the inorganic fiber block 33 is mounted on the inner surface of the furnace shell 31 with no gaps by fitting through the bolt holes 34a of the metal fitting 34 and screwing and tightening the nut 35 onto the stud bolt 32 protruding from the mounting metal fitting 34. Has become. In FIG. 3, reference numeral 36 denotes a support pipe made of stainless steel (SUS304) that supports the inorganic fiber block 33.

[0003]

[Problems to be solved by the device]

 However, since the length of the conventional stud bolt is about ⅕ to ½ of the thickness of the inorganic fiber block, the tip end is in the inorganic fiber block, and the screw of the nut on the tip end is screwed. It was difficult to work together. As the thickness of the inorganic fiber block increases, the screwing operation of this nut becomes more difficult because it is performed at a deeper place (near the inner surface of the furnace shell) through the small holes of the inorganic fiber block. It is even more difficult if it is not planted perpendicular to the inner shell surface. Then, this invention aims at provision of the stud bolt which can screw a nut easily.

[0004]

[Means for Solving the Problems]

 In order to solve the above-mentioned problems, the stud bolt of the present invention is a stud bolt that is implanted on the inner surface of a furnace shell via a base end portion for attaching an inorganic fiber block to the furnace shell, and has a threaded portion. A shaft portion and a taper portion that is connected to the tip portion of the shaft portion and that has a taper whose tip side has a gradually smaller diameter of 1 / 1.8 or less. It is preferable that the threaded portion has a threadless threaded portion at least at one circumferential position over the entire length. Further, it is preferable that the stud bolt is provided with a temporary fixing clip that can be fitted to the shaft portion and that can move only in one direction. Here, the taper is the ratio of the diameter of the cone to the length from the bottom surface to the apex (diameter / length).

[0005]

[Action]

 In the stud bolt of the present invention, when the nut is screwed into the threaded portion, the nut is guided by the taper portion so as to face the threaded portion. Due to the threaded portion of the threaded portion, even if foreign matter such as inorganic fibers is entangled in the threaded portion, the foreign matter is naturally removed by the threaded portion during one rotation of the nut. Further, the taper of the tapered portion is preferably 1 / 1.8 or less and 1/10 or more. Further, since the stud bolt is provided with the temporary fixing clip, the inorganic fiber block can be temporarily fixed. On the other hand, it is preferable to provide a hole centered on the shaft center on the end face of the tapered portion, and by inserting a guide rod into this hole, it is possible to easily fit the inorganic fiber block to the stud bolt. . The hole is not limited to the end face of the taper portion, and a small-diameter straight portion may be continuously provided on the taper portion and provided in the end face.

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 are a sectional view and a front view of a main part showing an inorganic fiber block mounting structure using a stud bolt according to an embodiment of the present invention. On the inner surface of the furnace shell 1 made of a metal plate, a stud bolt 2 is vertically planted by welding via its base end portion. The inorganic fiber block 3 is fitted into the stud bolt 2 through the bolt hole 5 of the mounting bracket 4, and is temporarily fixed by the temporary fixing clip 6 fitted in the stud bolt 2, and the stud bolt 2 It is screwed by tightening the nut washer 7 that is screwed on.

The stud bolt 2 is formed of a heat-resistant metal such as heat-resistant steel, is connected to a shaft portion 2b having a threaded portion 2a and a tip portion of the shaft portion 2b, and a taper whose tip side has a gradually smaller diameter. A portion 2c, a small-diameter straight portion 2d continuously provided at the tip of the taper portion 2c, and a threaded portion formed by cutting a part of the screw portion 2a over the entire length and axially extending to the taper portion 2c. The small-diameter straight portion 2d is formed with a threaded portion 2e, and a hole 8 is formed in the end surface of the small-diameter straight portion 2d with its axis as the center. In FIG. 1 of the embodiment, the taper of the taper portion 2c of the stud bolt 2 is drawn as ⅕, but it may be in the range of 1 / 1.8 to 1/10. It is possible to guide the nut washer 7 by directly facing the screw portion 2a. The temporary fixing clip 6 has a bolt hole 9 in the center, and a metal plate having a protrusion protruding toward the center with a radial or H-shaped notch in the peripheral edge of the bolt hole 9. Is. When the stud bolt 2 is fitted in the threaded portion 2a, the tip of the protrusion rises in the direction opposite to the pushing direction and digs into the valley of the threaded portion 2a. Therefore, the temporary fixing clip 6 moves in one direction (pushing direction) but does not move in the opposite direction. Further, the nut washer 7 is a combination of nuts and washers in order to avoid the difficulty of fitting only the washer to the stud bolt 2, and the nut portion 7a and the washer portion 7b are independent from each other. It can rotate. In FIG. 1, reference numeral 10 denotes a support pipe made of stainless steel (SUS304), which cooperates with the fitting 4 to support the inorganic fiber block 3.

In order to construct a furnace wall of various industrial furnaces by the mounting structure of the inorganic fiber block having the above-described structure, first, a large number of stud bolts 2 are previously attached to the inner surface of the furnace shell 1 via respective base end portions. Vertically welded at required intervals by welding. Then, a guide rod (not shown) is inserted into the hole 8 of the small-diameter straight portion 2d of the stud bolt 2, and the inorganic fiber block 3 is fitted into the stud bolt 2 through the bolt hole 5 of the mounting bracket 4 by this guide rod. After that, similarly, a temporary fixing clip 6 is fitted to the threaded portion 2a of the stud bolt 2 with a guide rod, and is pressed against the inner surface of the mounting bracket 4 as shown in FIG. By pressing the temporary fixing clip 6, the inorganic fiber block 3 is temporarily fixed. After the inorganic fiber block 3 is temporarily fixed, the nut washer 7 is screwed by the guide rod to the threaded portion 2a through the small diameter strut portion 2d and the taper portion 2c, and the nut washer 7 is tightened. Complete. When the nut washer 7 is screwed into the screw portion 2a, the nut washer 7 is guided by the taper portion 2c to the screw portion 2a and directly faces the screw portion 2a, so that the nut washer 7 can be easily screwed. It can be done reliably. When tightening the nut washer 7, even if foreign matter such as inorganic fiber is entangled in the screw portion 2a, the foreign matter is naturally removed by the threadless portion 2e during one rotation of the nut washer 7. Can be done easily. Then, when the attachment of the inorganic fiber block 3 to each stud bolt 2 is completed, the furnace wall is completed. Here, the mounting speed of the inorganic fiber block 3 using the stud bolt 2 of the present invention is about double that of the conventional one, and the workability can be doubled. Also, by using the temporary fixing clip 6, the work of two people can be done by one person.

In the above embodiment, the case where the threaded portion 2e is provided at one position in the circumferential direction has been described, but the present invention is not limited to this, and it may be provided at two or more positions in the circumferential direction. . Further, the hole 8 into which the guide rod is inserted is not limited to being provided on the end surface of the small diameter straight portion 2d, but may be provided on the end surface of the taper portion 2c when the small diameter straight portion 2d is not provided.

[0010]

[Effect of device]

 As described above, according to the stud bolt of the present invention, when the nut is screwed into the threaded portion, the nut is guided by the taper portion so as to face the threaded portion. It can be easily screwed into the threaded portion. Further, since the threaded portion has the threaded portion, even if foreign matter such as inorganic fiber is entangled in the threaded portion, the foreign material is naturally removed by the threaded portion during one rotation of the nut. The nut can be easily tightened. Furthermore, since the stud bolt is equipped with a temporary fixing clip, it is possible to temporarily fix the inorganic fiber block, so there is no need to hold the inorganic fiber block until the nut is completely tightened as in the conventional case. Block mounting work can be done quickly and reliably, and work efficiency can be greatly improved.

[Brief description of drawings]

FIG. 1 is a sectional view showing a mounting structure of an inorganic fiber block using a stud bolt according to an embodiment of the present invention.

FIG. 2 is a front view of a main part of the mounting structure for the inorganic fiber block of FIG.

FIG. 3 is an exploded perspective view showing a conventional inorganic fiber block mounting structure using stud bolts.

[Explanation of symbols]

 1 Furnace shell 2 Stud bolt 2a Screw part 2b Shaft part 2c Tapered part 2e Missing thread part 3 Inorganic fiber block 4 Mounting bracket 6 Temporary fixing clip 7 Nut washer

Claims (3)

[Scope of utility model registration request] 1. A stud bolt, which is planted on the inner surface of a furnace shell via a base end portion for attaching an inorganic fiber block to the furnace shell, the shaft portion having a threaded portion, and a tip portion of the shaft portion. Is a continuous taper with a taper that gradually decreases in diameter on the tip side.
A stud bolt having a taper portion of 1.8 or less. 2. The stud bolt according to claim 1, wherein the threaded portion has a threaded portion having no thread over its entire length at least at one position in the circumferential direction. 3. The stud bolt according to claim 1, further comprising a temporary fixing clip that is fitted to the shaft portion and is movable only in one direction.