JPS6031416A - Chute with flow rate controller, for loader - Google Patents

Abstract

PURPOSE:To heighten the effect of dust-proofing, by providing a lowest outer pipe for a chute, movably up and down relative to a lowest short inner pipe for the chute, and coupling control lids to these pipes through rods, movably relative to the pipes, to secure a prescribed sucked air flow speed even if the outgoing quantity of a material in bulk fluctuates. CONSTITUTION:When the piston rods 15A of cylinders 15 are driven in or out, the lowest outer pipe 8C of a chute is moved up or down together with hangers 16, relative to the lowest short pipe 6B of the chute. Swing rods 11 are tilted depending on the length of the movement of the outer pipe 8C to transmit its upward or downward movement to control lids 14 through coupling rods 13. When the distance between the short pipe 6B and the control lids 14 is increased, the distance between the outer pipe 8C and the control lids is also increased to secure a dust-sucking air inflow gap depending on the increase in the outgoing quantity of a material in bulk. When the control lids 14 approach the short pipe 6B, the outer pipe 8C also approaches the control lids to maintain a prescribed sucking air flow speed at the outlet port of the outer pipe 8C to suck dust to prevent it from going away.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a dustproof chute for handling bulk materials, and more particularly to a dustproof chute that can respond freely to changes in the amount of inflow.

As shown in Fig. 1, a conventional dustproof chute for a loader has an inner chute pipe 2 connected to a discharge port 1 of a bulk material conveyor.
An airtight sealed tube 3 is provided to cover the outside of this chute inner tube 23.
A dust collector 4 is connected to the sealed tube 3. Then, a pseudo inner tube 2 is placed in the center of the sealed tube 3 and the lower end opening 3A.
A rectifying plate 5 is fixedly installed opposite the lower end of the rectifying plate 5. The loose objects dropped into the chute inner tube z through the discharge port 1 fall and collide with the accumulated loose objects on the rectifier plate 5, and fall below the lower end opening 3A while braking the falling speed. The chute inner tube 2
When the loose objects collide with the current plate 5 and are braked, the dust present in the loose objects thrown into the lower end opening 3A is generated and floats. This dust is collected by the airflow sucked into the dust collector 4 from the lower end opening 3A.

However, in such a device, since the opening area of the lower end opening 3A is constant, if there is a change in the amount of loose materials to be transported or the physical properties, the thickness of the flux of the bulk materials passing through the lower end opening 3A will change. When the flux becomes thicker, the remaining air gap becomes smaller and sufficient intake airflow cannot be obtained, and when the flux becomes smaller, the remaining air gap becomes larger and the intake airflow becomes smaller. This has the disadvantage that the dust suction ability is reduced due to a decrease in the flux of dust, which causes dust leakage.

SUMMARY OF THE INVENTION In view of the above drawbacks, it is an object of the present invention to provide a dustproof chute in which the flow area of the opening at the bottom of the chute can be freely adjusted.

The configuration of this invention will be explained based on the drawings of the embodiments. Second
The figure shows a sectional view of the lower part of the chute, and the AA sectional view of FIG. 2 is the same as that of FIG. 3 (the BB sectional view is shown in FIG. 4, respectively).

In the figure, the chute inner pipe 6 that communicates with the discharge port (not shown) of the bulk material conveyor has a plurality of upper-opening Taber short pipes 6A arranged so as to overlap in the vertical direction, with the Taber short pipes at the bottom end thereof. Lower chute short pipe 6 that is longer in the vertical direction than 6A
The Taber short pipes 6A and the lower chute short pipes 6B are connected at equal intervals via a four-way rope 7A, and the lower chute short pipes 6B are connected to the discharge port of the conveyor via a hoisting lobe 7B. It is hung below so that it can move up and down. Dust collector 4
(See Fig. 1) The chute outer tube that communicates with the outer chute tube 8A is a bellows tube 8A that telescopically and airtightly covers the outer periphery of the Taber short tube 6A, and a bellows tube 8A that telescopically and airtightly covers the outer periphery of the lower chute short tube 6B. 8B and a rigid lower chute outer tube 8C, which is arranged below and has a reduced diameter outlet, are connected. A plurality of brackets) 9 are provided on the outer surface of the lower chute short pipe 6B.
A guide roller 9B is rotatably supported via A, and this guide roller 9B is inscribed in the lower chute outer tube 8C. A cross-shaped girder 10 that also serves as an inlet cover is provided inside the lower chute short pipe 6B. One end of a swing ring 11 is pivotally supported on this girder 10, and the free end of the swing ring 11 is connected to the lower chute outer pipe 80. It is slidably engaged with the guide pin 12 inside. The upper end of a connecting ring 13 is rotatably supported in the middle of the swing ring 11 via a pin ll'A, and an inverted conical adjustment lid 14 is connected to the lower end of the connecting ring 13. The lower chute short pipe 6B has an inner pipe flange part 6o protruding from its upper end that connects the ropes 7A, '7B and the bellows pipe 8A%8B, and a cylinder 15 is provided on the inner pipe flange part 60. The rod 15A of the cylinder 15 is made to protrude downward from the inner tube flange portion 60 so as to be freely retractable and retractable. And this rod 15
The protruding end of A is fitted onto the hanging shaft 16 protruding from the outer surface of the lower chute outer tube 80.

The outer diameter of the adjustment lid 14 is larger than the outlet diameter of the lower chute short pipe 6B and the outlet diameter of the lower chute outer pipe 80, and a level meter 17A is installed near the outlet of the lower chute short pipe 6B.
, 17B are preferably arranged above and below.

The operation of the above configuration will be explained next.

The Taber short pipe 6A and the lower chute short pipe 6B guide the loose materials to be dropped. The bellows pipes 8A, 8B and the lower chute drop pipe 80 guide the dust suction airflow flowing into the dust collector 4 around the outer peripheries of the short pipes 6A, 6B.

When the cylinder 15's rod 15A goes in and out, the hanging shaft 16
At the same time, the lower chute outer tube 80 moves up and down with respect to the lower chute furnace tube 6B. When the lower chute outer tube 80 is vertically interlocked with respect to the lower chute short pipe 6B, the swing ring 11 is tilted according to the interlocking distance, and the vertical interlocking is transmitted to the lid 14 via the connecting ring 13. The adjustment lid 14 is located between the lower edge of the lower chute short pipe 6B and the outlet of the lower chute outer pipe 80, and is adjusted according to the increase or decrease in the distance between the lower edge of the lower chute short pipe 6B and the outlet of the lower chute outer pipe 80. The distance from the outlet of the lower chute outer tube 8C to the adjustment lid 14t is made to be a constant ratio. When the distance from the lower chute short pipe 6B to the adjustment lid 14 increases, the distance from the adjustment lid 14 to the lower chute outer tube 80 also increases. When the upper interval of the adjusting lid 14 is expanded and the amount of outflow of shellfish increases, the lower interval of the adjusting lid 14 is also expanded to ensure an inflow gap for dust-collecting air.

When the adjustment lid 14 approaches the lower chute short pipe 6B, the lower chute outer pipe 8C also approaches the adjustment lid 14, maintaining the intake air flow at the outlet of the lower chute outer pipe 8C at a predetermined speed and sucking powder to prevent dust. do. When the level of loose materials remaining in the outlet of the lower chute short pipe 6B reaches the upper limit, the level meter 17
Since A is detected, the rod 15A of the cylinder 15 is pushed out and the lower chute outer tube 80 and the adjustment lid 14 are lowered to increase the outflow amount. Furthermore, when the loose materials remaining in the outlet of the lower chute short pipe 6B reach the lower limit, the level meter 17B detects this, so the rod 15A of the cylinder 15 is retracted, the lower chute outer pipe 80 and the adjustment lid 14 are raised, and the flow gap is increased. It narrows down the

As explained above, the present invention provides a lower chute outer tube that is movable up and down in the lower chute short tube of a double tube chute,
By providing the adjustment lid so as to move relative to both of them via the rod, the gaps between the lower chute short pipe and the adjustment lid and between the adjustment lid and the lower chute outer pipe increase and decrease together at a predetermined ratio. A chute with a large dust-proofing effect that can maintain a predetermined intake flow rate even when the amount of loose materials flowing out varies is obtained.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing an example of a conventional dustproof chute for a double pipe loader, Fig. 2 is a sectional view of the lower part of the chute showing an embodiment of the present invention, and Fig. 3 is a line A-A in Fig. The sectional view, FIG. 4, is a sectional view taken along line BB in FIG. 6; Shoot inner tube, 6B; Lower shoe F short tube, 8A, 8
B: Bellows tube, 80: Lower chute outer tube, 11.13: Rod, 14: Adjustment lid l Figure 2 Figure 3 Figure 4 r Figure 4 r

Claims (1)

[Claims] In a dust-proof chute for a loader, in which the outside of an inner chute pipe communicating with a bulk material discharge port is covered with an outer chute pipe communicating with a dust collector, a lower chute short pipe that occupies the lower part of the chute inner pipe is provided with a vertically movable member on the outer periphery of the lower chute short pipe. A lower chute outer pipe is provided, and an adjustment lid is suspended between the lower chute short pipe and the lower chute outer pipe via a rod suspended between the lower chute short pipe and the lower chute outer pipe. A leader chute with a characteristic flow rate adjustment device.