JPH0792426B2 - Pellet crushing strength measuring device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for measuring the crush strength of pellets used in blast furnaces, converters and the like.

[0002]

2. Description of the Related Art For example, in a blast furnace, pellets are used in addition to sinter ore and iron ore as an iron source. These pellets are obtained by adding a binder to the iron-containing powder and granulating it with a granulator.The strength changes depending on the granulation conditions, so during transportation and storage, or in the blast furnace In some cases, it may be destroyed or pulverized, and stable blast furnace operation may not be continued. Therefore, the pellets need to have a strength equal to or higher than a predetermined value, and the strength is measured when the pellets are used in a blast furnace.

As a means for measuring this strength, for example, there is one proposed in Japanese Patent Publication No. 52-46709, which will be described with reference to FIG.

Prior to measuring the crushing strength of the pellet P, the pellet 1 to be measured is supplied to a vibration hopper 20.
The pieces are cut out one by one and supplied onto the two transport rails 21 having a downward slope.

The pellets P supplied onto the transport rail 21 roll to the leading end and stop.

[0006] A cylinder 23 having a piston rod 22 provided so as to be movable back and forth in a direction perpendicular to the front side of the transport rail 21 is operated to move the pellet P at the leading edge on the transport rail 21 to the piston rod. Push 22 to the side.

The extruded pellet P is a funnel 24.
After being dropped and supplied onto the guide frame 25 via the, the crush strength measuring machine 1 is pushed by the pressing body 26 and advances on the guide frame 25.
Supplied to zero.

[0008] The pellet receiver 27 is rotated to stop the tip of the pellet P at a predetermined position of the crushing strength measuring machine 10 so that the pellet P pushed forward by the pushing body 26 can be set in the crushing strength measuring machine 10. Let me wait.

In this way, the pellets P supplied by are received by the pellet receiver 27, and after a predetermined time, the pellet receiver 27 is rotated to its original position and stopped.

In this state, a crushing head (not shown) is lowered to measure the crushing strength of the pellet P.

[0011]

However, since the pellets P are not perfectly spherical and have a distorted shape, and the particle diameters thereof are various, as described above, the pellets P are individually supplied from the hopper 20. The hopper 20 must have a complicated structure in order to supply it onto the transport rail 21, and further, in order to set the pellet P in the crushing strength measuring machine 10 as described above, the pushing frame 26 guides the guide frame. 25 The crushing strength measuring machine 1
At the upper center of 0, the pellet receiver 27 receives it, and after a predetermined time, the pusher 26 and the pellet receiver 27 are retracted, and then the crushing head is lowered and crushed.
Also, when the pellet receiver 27 retracts, there is a problem that the distorted spherical pellet P rolls off from the center and an accurate crush strength value cannot be obtained. Further, since the transportation route up to transportation to the crushing strength measuring machine 10 is complicated, there is a problem that the transportation device becomes complicated.

An object of the present invention is to provide an apparatus having a simple apparatus configuration and capable of reliably setting each pellet one by one in the central portion of the crushing strength measuring machine.

[0013]

Means for Solving the Problems The present invention has been made to solve the above problems, and means (1) cuts out pellets stored in a hopper and conveys them between the crushing heads of a crushing strength measuring machine. After that, crush with the crushing head,
In a device for measuring the crushing strength, a vibrating trough having a V-shaped cross section for transporting pellets cut by a cutting feeder provided at the lower part of the hopper, and one pellet transported by the vibrating trough, respectively. A particle size measuring instrument that can be moved up and down to measure the particle size of the placed pellets, a pellet detector that detects the presence or absence of pellets on the particle size measuring instrument, and a measurement using the particle size measuring instrument After adjusting the position in the vertical direction by the value of the particle size, the central part of the pellet on the particle size measuring device is grasped, and then it is moved forward and conveyed between the crushing heads of the crushing strength measuring device and the crushing head. Has a gripping mechanism that opens and retreats when it comes into contact with the held pellets.

The means (2) is such that at least one side wall of the hopper is provided with a movable wall which can be moved upward.

[0015]

By the means (1), the pellets to be crushed can be reliably set in the middle portion of the crushing head of the crushing strength measuring machine, and the crushing strength can be inexpensively and accurately measured. Further, the means (2) eliminates the suspension of pellets in the hopper, and enables the pellets to be stably conveyed to the crushing strength measuring machine.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT An embodiment of the present invention will be described below with reference to FIGS.
Will be described with reference to.

FIG. 1 is an overall perspective view of an apparatus for measuring the crush strength of pellets, and FIG. 2 is a plan view.

In the figure, 1 is a hopper for storing pellets P,
Reference numeral 2 denotes a conveyor that constitutes one side wall of the hopper 1, and inside the hopper 1, an inner belt 2a of the conveyor 2 is moving in the arrow Y direction (upward). Reference numeral 3 is an electromagnetic linear feeder having a V-shaped cross section for cutting out the pellets P in the hopper 1, 4 is a trough having a V-shaped cross section installed on the vibrator 4a, and its depth h ₁ is the depth of the electromagnetic linear feeder. It is shallower than h ₂ .

A reference numeral 5 is provided in the vicinity of the downstream end of the gutter 4 so as to be movable up and down, and a particle size measuring lift for measuring the particle size of the pellet P by the amount of the lift, 6 are arranged on both sides above the lift 5, A pellet detector that detects the presence or absence of the pellet P on the lift 5, and includes an optical type, a contact type, a weight measuring type, and the like. A leveling cylinder 7 is located on the vertical line of the particle size measuring lift 5 and can be stopped at the upper and lower limit positions and the intermediate position thereof (the same level position as the lower surface of the crushing head 10a of the crushing strength measuring machine 10). .

Reference numeral 8 designates an elevator 8a which can be moved up and down, a support member 8c which is provided on the traveling path 8b fixed to the elevator 8a so as to be movable in the directions of the arrows X and Z, and a tip of the support member 8c. The gripping mechanism includes an openable / closable hand 8d and a brush 8e fixed to the lower surface of the support member 8c.

Numeral 9 is rotatably provided on the crushing strength measuring machine 10 and covers the front side between the crushing heads 10a and 10b.
When the pellets P are crushed by the crushing heads 10a and 10b, a cover is provided to prevent the fragments of the pellets P from scattering. Reference numeral 11 denotes the crushing heads 10a and 10b for crushing the fragments of the pellets P destroyed by the crushing heads 10a and 10b. It is a suction machine that removes by suction from the rear of the space.

Next, the operation will be described with reference to FIG.

First, the operator operates a switch (not shown).
When the switch is turned on, the electromagnetic linear feeder 3, the vibrator 4a and the conveyor 2 are activated (100 to 102).

As a result, the pellets P stored in the hopper 1 are cut out by the electromagnetic linear feeder 3 and conveyed to the gutter 4 without hanging the shelves. Then, the pellets P having various particle sizes on the gutter 4 are
It has a V-shape, and further, by vibrating vertically in an obliquely upward direction toward the tip, it is sequentially conveyed in the tip direction of the gutter 4 and arranged in a line.

The pellet P conveyed to the tip of the gutter 4 is placed on the particle size measuring lift 5, and the pellet detector 6
Is detected (103).

When the pellet P is detected, the operation of the electromagnetic linear feeder 3 and the vibrator 4a is stopped,
Cutting out and conveying the pellet P is stopped (104). Further, the particle size measuring lift 5 located at the lower limit starts to rise (105).

While the particle size measuring lift 5 is being lifted, the pellets P come into contact with the lower surface of the head 7a of the leveling cylinder 7 waiting at the lower limit position. Further, the head 7a of the cylinder 7 is pushed up as the lift 5 rises.

When the intermediate position, that is, the lower surface level of the head 7a reaches the same height as the lower surface position of the crushing head 10a of the crushing strength measuring machine 10, the leveling cylinder 7 is stopped, and at the same time, the particle size measuring lift is lifted. 5 also stops climbing.

When the particle size measuring lift 5 is stopped,
The particle size of the pellet P is obtained by measuring the amount of rise of the lift 5 (106). When this measurement is completed, the leveling cylinder 7 is raised and retracted to the raised position (10
7).

Thus, it is judged whether or not the measured particle size of the pellet P is within the reference range, and if it is out of the range, the particle size measuring lift 5 is lowered to a predetermined position, stopped and grasped. The elevator 8a of the mechanism 8 is lowered to a predetermined position and stopped. Then, the support member 8c moves forward along the traveling path 8b in the direction of the arrow X, so that the pellet P is removed from the particle size measuring lift 5 by the brush 8e (108).
~ 111).

When the removal is completed, the support member 8c again moves backward along the traveling path 8b in the direction of the arrow Z, stops at the original position, and the particle size measuring lift 5 also descends and stops at the lower limit position (112, 113). ). Then, after that, the electromagnetic linear feeder 3 and the vibrator 4a are operated again, and the pellet P is cut out and conveyed (102).

On the other hand, when the measured particle size of the pellet P is within the reference range, the particle size measuring lift 5 is maintained at the same position, and the elevator 8a of the gripping mechanism 8 moves the measured particle size of the pellet P. It moves up and down based on the particle size value, and the height position of the hand 8d of the gripping mechanism 8 is adjusted to a position where the center of the pellet P on the particle size measuring lift 5 in the height direction can be gripped. As a result, when the pellet P is gripped by the hand 8d, it can be securely gripped without slipping off (114).

Thereafter, the hand 8d of the gripping mechanism 8 grips the center portion of the pellet P on the particle size measuring lift 5, and the particle size measuring lift 5 descends to the original lower limit position and stops (115). , 116). Then, the support member 8 of the gripping mechanism 8
c moves forward along the traveling path 8b in the direction of arrow X, conveys between the crushing heads 10a and 10b of the crushing strength measuring machine 10 and to the central portion immediately below the crushing head 10a and stops (11).
7).

In this state, the lower head 10b of the crushing cylinder is raised to sandwich the pellet P between the two heads 10a and 10b (118). At this time, the crush load is measured by a load cell (not shown) provided in the crush head 10a, and the crush load is a predetermined value (5 Kg / cm ₂ ), that is, the pellets P can be held by the crush heads 10a and 10b. When the state becomes the state, the hand 8d of the grasping mechanism 8 is opened to release the grasped state of the pellet P, and the support member 8c is moved backward in the arrow Z direction and stopped at the original position (119, 119).
120).

Next, the cover 9 is rotated in the direction of arrow V to cover the space between the crushing heads 10a and 10b, and the crushing head 10
When the pellet P is crushed by a and 10b, the pellet P
Prevents the scattering of debris (121).

Thus, the crushing head 10b is raised at a predetermined speed (about 20 mm / min) to crush the pellet P.
At this time, the crush load measured by the load cell provided in the crush head 10a is introduced into a calculator (not shown) and processed to calculate and detect the crush strength.

When this crushing is completed, the crushing head 10b descends to the lower limit position and stops, and the cover 9 rotates in the direction of arrow W and stops at the original position (122-12).
4).

By repeating this in sequence, one pellet P,
The crush strength of one piece is measured.

In this embodiment, the crushing head 10b of the crushing strength measuring machine 10 is raised, but the invention is not limited to this, and the crushing head 10a may be lowered, and both heads 10a, You may make it ascend and descend 10b. At this time, the position between the crushing heads 10a and 10b of the pellet P sandwiched by the hands 8d of the gripping mechanism 8 is located directly above the crushing heads 10b in the former case, and in the middle between the crushing heads 10a and 10b in the latter case. Need to be located.

[0040]

As is apparent from the above description, the present invention has a simple structure and enables the pellets to be crushed to be reliably set in the middle portion of the crushing head of the crushing strength measuring machine, which is inexpensive and highly accurate. Crush strength can be measured, and moreover,
By constructing at least one side part of the hopper with a moving wall, there is no suspension of pellets in the hopper, and a great effect is achieved such that the pellets can be stably conveyed to the crush strength measuring machine. It is a thing.

[Brief description of drawings]

FIG. 1 is a simplified overall perspective view showing a crushing strength measuring device according to an embodiment of the present invention.

FIG. 2 is a plan view of FIG.

FIG. 3 is a flowchart showing an operation state of this embodiment.

FIG. 4 is a simplified plan view showing a conventional example.

[Explanation of symbols]

 1 Hopper 2 Conveyor 2a Inner belt 3 Electromagnetic linear feeder 4 Gutter 4a Vibrator 5 Lift 6 Pellet detector 7 Leveling cylinder 7a Head 8 Grasping mechanism 8a Elevator 8b Traveling path 8c Supporting member 8d Hand 8e Brush 9 Cover 10a Crushing strength measuring machine 10b crushing head

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Hiroyoshi Matsuo 1 Nishinosu, Oita City, Oita Prefecture Nippon Steel Co., Ltd. Oita Works (72) Inventor Motozo Moriyama Oita City, Oita Prefecture 1 Nishinozu, Oita, Japan New Nippon Steel Co., Ltd. Oita Steel Works (72) Inventor Yamazaki ▲ Atsushi ▼ 1st Nishinosu, Oita City, Oita Prefecture New Japan Steel Co., Ltd. Oita Steel Works (72) Inventor Kuriyama Oshi Hita City, Oita Prefecture 2515, town 3

Claims (2)

[Claims] 1. A device for measuring the crush strength by cutting out pellets contained in the hopper, conveying the crush strength between crush heads of a crush strength measuring machine, and measuring the crush strength. A vibration gutter having a V-shaped cross section for conveying the pellets cut out by the cutting feeder provided in the above and one pellet conveyed by the vibration gutter are placed, and the particle size of the placed pellets is measured. A vertically movable particle size measuring device, a pellet detector for detecting the presence or absence of pellets on the particle size measuring device, and a position in the vertical direction adjusted by the particle size value measured by the particle size measuring device. After gripping the central portion of the pellet on the particle size measuring device, the pellet has a gripping mechanism that advances and conveys between the crushing heads, and opens and retracts when the crushing head contacts the pellets. Pellet crushing strength measuring device Place 2. The pellet crush strength measuring device according to claim 1, wherein at least one side wall of the hopper is provided with a movable wall which can be moved upward.