JPS6313481Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a sampling device for a belt conveyor for transporting bulk materials.

Due to the need to accurately grasp the properties of bulk raw materials, etc. and to manage subsequent processes with reasonable precision, it can be easily installed on existing bulk conveyor conveyors, and it is possible to uniformly control the entire cross-section of transported goods. There is a need for a sampling device that can perform sampling and is easy to handle.

For example, blast furnace operation in modern steel plants requires high precision, and control of the permeability of the charge inside the furnace is extremely important. In particular, the powder of 5 mm or less contained in the sintered ore, which accounts for 80% of the charged ore, is the main factor controlling the ventilation resistance of the blast furnace shaft, and is also the main cause of Ansatutsu formation. However, the particle size distribution of finished sintered ore and the contamination rate of particles smaller than 5 mm are controlled at the exit from the sintering factory.
The particle size distribution of sintered ore changes due to the transportation process from the sintering factory to the blast furnace, pulverization and particle size segregation in the ore storage tank, and variations in the sieving efficiency of the screen under the tank, so blast furnace operation and There was a problem of not being able to take adequate measures. In addition, in order to increase the sieving efficiency of the screen under the tank and reduce the contamination rate of particles of 5 mm or less in the finished sintered ore, the sieve screen should be managed.
It is necessary to control the layer thickness on the sieve, and for this purpose it is important to perform appropriate sampling and evaluate whether the powder is controlled below the target. A portion of the flow width of the size was sampled by input, which caused problems in terms of representativeness of the sample and work safety.

In order to solve these problems, there is a need for an apparatus that can simply, reliably, and accurately sample various types of ore discharged from an ore storage tank immediately before charging it into a blast furnace.

Figure 1 shows the flow of ore charging into a blast furnace. Sintered ore is transported by conveyor from a sintering factory (not shown) and is once stored in ore storage tank 1, and then transferred to a sieve machine below the tank. After removing powder of 5 mm or less in step 2, a certain amount of oversized powder is stored in the food hopper 3,
The ore is cut according to the blast furnace charging schedule and charged into the surge hopper 5 by the ore conveyor 4.
It is discharged onto a charging conveyor 7 via a feeder 6 and charged into a blast furnace 8.

In this flow, a sampling device 9 is installed at the head of the conveyor 4, which is located as close as possible to the blast furnace and can sample the ore etc. discharged from each ore storage tank, and from the viewpoint of easy handling of the samples. However, it is appropriate to transport the sample via truck 10 to analysis room 11.

When installing a sampling device on an existing conveyor, it is often difficult to secure a large space. In addition, because particle size segregation is inevitable in bulk materials,
It is necessary to sample the entire cross section perpendicular to the direction of transport flow.

Conventionally, as sampling devices disposed at the head of a belt conveyor, for example, a spoon sampler shown in FIG. 2, a cart type box sampler shown in FIG. 3, a cutter sampler shown in FIG. 4, etc. are known.

The spoon sampler shown in FIG. 2 moves a cart 13 forward and backward using a cylinder 12, etc., and samples using a spoon-shaped sample collection box 14 fixed to the cart 13. It is difficult to sample uniformly.

The trolley-type box sampler shown in Figure 3 is a moving device 1.
This is a large-scale device that performs sampling by attaching a sample collection box 16 to a trolley that travels across the bottom of the chute by means of 5.It requires raising the height of the conveyor head pulley, etc., and is extremely difficult to install on an existing conveyor. be.

The cutter sampler shown in FIG. 4 collects samples by moving a cutter 18 using a moving device 17, and inputs the material into a sampling chute 19.
The mounting position of the chute 19 is limited, and separate handling means such as secondary movement of the sample is required depending on the conditions of the installation location.

Further, all of these sampling devices require a large space in terms of plane, and it is often difficult to install them on an existing conveyor.

The object of the present invention is to provide a sampling device that eliminates the drawbacks of these conventional sampling devices.

Figures 5, 6, and 7 show embodiments of the present invention, with Figure 5 being a front view, Figure 6 being a sectional view taken along line A-A in Figure 5, and Figure 7 being a perspective view of the main parts. be.

In the figure, 21 is a traveling rail, and 23 is its support. The traveling rail 21 is constructed above the chute 22 at right angles to the longitudinal direction of the conveyor 4, and further extends to an arbitrary position. The extending traveling rail may be linear or curved, and the extending distance is not limited and is arbitrary. 24 is a sampler,
It is suspended from the running rail 21 via wheels 25, a self-propelled device 26, and a lifting device 27. Sampler 2
4 is equipped with a box-shaped sample collection box 28, and on the top surface of this box 28, two flat bar-shaped cutters 29 are placed facing each other in a V-shape with the blades facing diagonally upward. It is attached to form a slit-like sampling opening 30. The bottom plate 3 of the box 28 is configured to be openable and closable, and an operating handle 32 for opening and closing the bottom plate is attached.

The cutter 28 forms a thin slit, that is, a sampling opening 30, through which the falling objects from the conveyor 4 are collected, and the amount of sample collected per increment is regulated so that it does not exceed the storage capacity of the box 28. It is. The width of the sampling opening 30 (width of the slit) is set to be about three times the maximum particle size of the bulk material to be sampled, and the vertical length (length of the slit) is set to be sufficiently larger than the thickness t of the bulk material discharged from the conveyor 4. is,
To enable sampling from the entire cross section of the flow of bulk materials.

The sampler 24 is suspended by a wire rope 33 via a lifting device 27.
The box is provided with a vibration stopper to prevent the sampler from vibrating during the process of traversing the inside of the box to perform sampling. Two types of vibration stopper are provided. One supports the reaction force against the flow of the bulk material to be sampled and consists of a guide roller 34 attached to the back of the sampling box and a guide rail 35 fixed inside the chute 22, and the guide roller 34 is guided between the two guide rails 35. The other vibration stopper prevents the head of the sampler 24 from vibrating horizontally, and a vibration stopper metal fitting 37 for the sampler head is inserted and held in a guide tube 36 provided on the self-propelled device 26.

The self-propelled device 26 moves the sampler 24 across the chute 22 at a constant speed, traverses the bulk material being discharged from the conveyor 4 into the chute 22, and uniformly samples the entire cross section of the bulk material.
The speed at which the sampler travels inside chute 22 is 40~
Approximately 50m/min is appropriate. After collecting the sample, the self-propelled device 26 travels on the extended running rail 21 and transports the sample to an arbitrary predetermined sample discharge position. A power supply cable for supplying power to the self-propelled device 26 and a lifting device 27 to be described later, and an operation cable for controlling these devices are installed by an appropriate method.

In the present invention, the sample discharge position can be provided at any position, and it can be easily arranged to be most convenient for handling without being restricted by existing facilities. Further, it is also possible to change the discharge position or to set a plurality of discharge positions.

The lifting device 27 suspends the sampler 24 with a winch via a wire rope 33 so that the sampler 24 can be raised or lowered to an arbitrary height, and the collected sample is transferred to a receiver or track 38 installed at an arbitrary height. There is no need for separate sample lifting equipment or transfer containers, and there is no powdering due to transfer, especially when handling bulk materials that easily powderize, and the discharge head can be minimized. Optimal.

In the sampling device of the present invention, when collecting two increment samples, the sampler 24 can be moved back and forth within the chute 22, and when collecting one increment sample, the sampler 24 can be returned to the standby position when the sample is exhausted. Just let it happen.

Since the sampling device of the present invention is configured as described above, (1) it can be easily installed on an existing conveyor, there are few space constraints, and the optimum sample discharge position can be selected regardless of the existing equipment; equipment costs are low.

(2) Uniform sampling of the entire cross section of transported bulk materials is possible, resulting in high sample reliability.

(3) The collected sample can be quietly discharged as it is into a receiver placed at any height without having to be transferred, making it possible to obtain highly accurate samples even for powdered loose materials.

(4) Sampling can be performed mechanically, which is labor-saving, easy to handle, and has high work safety.

(5) Information useful for subsequent plant management, such as blast furnace operation, can be obtained, and the accuracy of raw material quality control can be improved, greatly contributing to operational stability.

[Brief explanation of the drawing]

Figure 1 illustrates the process to which the present invention is applied.
The figures are explanatory diagrams of conventional bulk material sampling devices, in which Fig. 2 is a side view of a spoon sampler, Fig. 3 is a front view and side view of a trolley type box sampler,
FIG. 4 is a front view and a side view of the cutter sampler. 5 and 6 show embodiments of the present invention;
The figure is a front view, and FIG. 6 is a view taken along the line A--A in FIG. 5. FIG. 7 is a perspective view of essential parts of the embodiment. 4...Belt conveyor, 9...Sampling device, 11...Analysis room, 12...Cylinder, 13...
...Truck, 14,16...Sample collection box,
15, 17...Movement device, 18...Katsuta, 21
... Traveling rail, 22 ... Chute, 24 ... Sampler, 25 ... Wheels, 26 ... Self-propelled device, 27
... Lifting device, 28 ... Sample collection box,
29...Katsuta, 30...Sampling opening, 3
1... Bottom plate, 32... Bottom plate opening/closing operation handle,
33... Wire rope, 34... Guide roller for steady rest, 35... Guide rail for steady rest, 3
6... Guide tube, 37... Steady rest hardware, 38...
...Truck, A...Standby position, B...Sample discharge device.

Claims (1)

[Scope of Claim for Utility Model Registration] A traveling rail constructed above the head chute of a belt conveyor at right angles to the longitudinal direction of the conveyor, a self-propelled device that runs along the traveling rail, and a lifting device from the self-propelled device. The sampler consists of a top steady metal fitting that loosely fits into a downward guide cylinder fixed to the self-propelled device, and two samplers installed parallel to the traveling rail. It is equipped with a steady rest guide roller guided by a guide rail on the side, two flat bar-shaped cutters that face each other in a V-shape and form a thin slit-shaped opening on the upper surface, and a bottom plate that can be opened and closed. The self-propelled device allows the sampler to travel across the chute at a constant speed and to move freely to any position, and the elevating device allows the sampler to move up and down to any desired height. A sampling device for loose materials.