JPS5914326B2 - A method of lining the inner walls of large storage tank hoppers, chutes, etc. with synthetic resin thin plates. - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for lining the inner wall surface of a large storage tank hopper, chute, etc. installed in the hold of a bulk carrier, for example, with a synthetic resin thin plate.

In the above-mentioned steel plate hoppers for storage tanks, etc., bridging phenomena, adhesion phenomena, or corrosion phenomena of the inner wall surface of the granular raw materials occur, which impairs the smooth flow of the granular raw materials. For this purpose, for example, ultra-high molecular weight polyethylene, high-low density polyethylene, etc.
The above-mentioned problem is solved by lining with a thin plate made of an inert and smooth synthetic resin such as polypropylene so that the granular material comes into contact with the surface of the thin synthetic resin plate. Conventionally, for lining the inner walls of such large storage tank hoppers, chutes, etc. with synthetic resin plates, a method using screws has been adopted, which allows the synthetic resin plates to be firmly fixed. However, the steel plate that makes up the storage tank hopper is relatively thin, and since the thin steel plate is overlaid with a synthetic resin thin plate and fixed, the method using screws is not suitable for the steel plate and the synthetic resin thin plate that make up the hopper. Drill appropriate through holes and insert the through bolts through the through holes on both plates [,
The method of fixing with screws is used, which is tightened with nuts. However, with this method, it is necessary to drill through holes in the steel plate that makes up the hopper, and since the hopper is large, work must be carried out on both the inside and outside of the hopper. The workability was extremely poor and uneconomical. This invention aims to solve the above-mentioned problems.

This invention uses a special threaded stud, which is erected and fixed to the surface of the hopper steel plate by stud electric arc welding, and fixed by fitting it into a hole drilled in a thin synthetic resin plate and tightening it with a nut. This method uses screws.

Conventionally used threaded studs do not have extremely short dimensions due to their intended use, and 90 stud electric arc welding equipment has a special chuck device that allows a certain portion of the total length of the stud to be Since the stud is supported by the chuck and the stud is energized, its dimensions are subject to certain limitations.

Therefore, when fixing such a conventional threaded stud upright on the inner wall of the hopper, inserting it into a hole drilled in a thin synthetic resin plate, and tightening it with a nut, it is difficult to drill the hole into the steel plate surface of the hopper. Although this eliminates the need for installation work, it has been impossible to fix the studs with screws using conventional threaded studs because the ends of the studs protrude onto the surface of the thin synthetic resin plate, impairing its smoothness. This invention uses a special threaded stud to fix the inner wall of a large storage tank hopper, chute, etc. using a synthetic resin screw method that does not impair smoothness as described above. This is a method of lining a thin plate. In other words, in this invention, a synthetic resin thin plate B is erected and fixed to the inner wall surface A of a large storage tank hot spring, chute, etc. by stud electric arc welding. The rear chuck of a threaded stud 1 has a tip part as a threaded part 1a, a rear part as a chuck part 1b, and the rear chuck part 1b is integrally connected to the tip part threaded part 1a in a detachable manner. The tip screw part 1a from which the piece 1b has been broken off is fitted with the blank hole 2 drilled in the synthetic resin thin plate B, and a dish-shaped plate formed by cutting at the blank hole position on the surface of the synthetic resin thin plate is inserted. Hollow 3
This relates to a method of lining the inner wall surface of a large storage tank hopper, chute, etc., which is screwed with a dish-shaped nut 4 that fits into the tank, with a thin synthetic resin plate.

In this method, the threaded portion 1a of the threaded stud 1 is formed to a length corresponding to the thickness of the synthetic resin thin plate B used as the lining, and the chuck portion 1b is formed to have a length corresponding to the thickness of the thin synthetic resin plate B used as the backing.
The chuck piece 1b is formed so as to be chuckable with a chuck device, and the chuck piece 1b is detachably connected to the threaded piece 1a through a deep cut 5 formed on the circumferential surface of the chuck piece 1b. In such a method, the threaded studs 1 are erected and fixed on the inner wall surface A of the hot spring etc. at appropriate intervals, and holes are made in accordance with the positions of the threaded studs. In addition to overlapping appropriately sized synthetic resin thin plates B with holes 2 drilled in them, the holes 2 drilled in the synthetic resin thin plates B can be used to insert an arc shield used in stud electric arc welding. The synthetic resin thin plate B is overlaid on the inner wall surface A of the hopper, the threaded stud 1 is pushed into the hole 2, and the screw is attached to the inner wall surface A of the hopper by stud electric arc welding. With stud 1
There is an advantage that positioning of the threaded stud 1 with respect to the inner wall surface A of the hopper is not necessary if it is fixed upright.

As described above, in the method of this invention, a special threaded stud is used, and a very short threaded piece corresponding to the thickness of the synthetic resin thin plate is erected and fixed on the inner wall surface of the hopper, etc. Since the thin plate is screwed with a countersunk nut, the thin synthetic resin plate can be firmly fixed to the inner wall surface of a hopper etc. without impairing the smoothness of the surface of the thin synthetic resin plate. Since this is a method of fixing with screws using threaded studs, there is no need for drilling work on the inner wall surface of the hopper, etc., and the work can be done only on the inside of the hopper, that is, on one side. It is a method that has good workability and is very economical.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing a state lined by the method of this invention;
Fig. 2 is a front view of the threaded stud used in the method of the present invention, and Fig. 3 shows the threaded stud being erected and fixed on the inner wall surface of a hot spring etc. by stud electric arc welding, and then the chuck portion of the stud is folded. It is a figure which shows the state which removed. 1...Threaded stud, 1a...Threaded piece, 1b...Chuck piece, 2...
Stupid hole, 3... dish-shaped depression, 4... dish-shaped nut, 5... deep cut, A...
Inner wall surface of hopper etc., B...Synthetic resin thin plate.

Claims (1)

[Claims] 1 A synthetic resin thin plate B is fixed to the inner wall surface A of a large storage tank hopper, chute, etc. by stud electric arc welding, the tip part is a threaded piece 1a, and the rear part is a chuck part. piece 1b and no, and rear chuck piece 1
The rear chuck part 1b of the threaded stud 1, which is integrally and removably connected to the tip threaded piece 1a, is attached to the broken tip threaded piece 1a, and is drilled into the synthetic resin thin plate B. A hopper for a large storage tank, which is screwed by fitting a hole 2 provided therein and using a plate-shaped nut 4 that fits into a plate-shaped recess 3 cut and formed at the position of the hole on the surface of a thin synthetic resin plate. , a method of lining the inner walls of chutes, etc. with thin synthetic resin plates.