JPH0463178A - Movable sifting device and sifting method using the same - Google Patents

Abstract

PURPOSE:To select the optimum sifting rate and efficiency in accordance with the granular materials to be sifted having different grain diameters, densities, etc., by using a vibrating screen with its mesh, slope or vibration frequency capable of being changed, supplying a granular material conforming to the capacity and discharging the product without delay. CONSTITUTION:A receiving hopper 14 loaded on the front of the chassis 10 of a traveling vehicle, a variable-speed feeder 24 provided at the lower outlet of the feeder, and a variable-speed conveyor 22 for sending the granular material discharged from the hopper outlet by the feeder 24 to the rear of the chassis 10 inclined upward toward the rear of the chassis 10 and set in the middle of the chassis, are provided. A vibrating screen 16 with at least its mesh, slope or vibration frequency capable of being changed is loaded at the rear of the chassis 10 to send the granular material dropped from the rear end of the conveyor belt and received at its rear toward its front for sifting the material. Discharge conveyors 30 and 32 are furnished on the chassis 10 in the cross direction of the chassis 10 to receive the materials graded by the screen 16 at the front of the screen 16 and to withdraw the materials in any cross direction of the chassis 10.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a sieving device for granular materials such as industrial raw materials such as coke or agricultural products such as grains, and more specifically, a device that can be used on public roads. The present invention relates to a mobile sifting device that satisfies various vehicle specifications and a screening method thereof.

[Prior Art] Industrial raw materials such as coke, ferroalloys, iron ore, and phosphate ore are handled and transported in various ways from their generation locations to their final destinations. These granular cargoes are so-called bulk cargoes, which are a mixture of various particle sizes, from small grains and fine particles to large lumps, and are damaged during transportation and handling, resulting in an increase in fine particles, etc. Foreign substances such as stones and wood chips may also be mixed in.

In addition, even in granular cargo of agricultural products such as grains such as wheat and rice, broken grains, powder, etc. increase during stationary handling, and foreign substances may be mixed in. Sieving is necessary to remove these. It is true that they had similar problems.

On the other hand, the users who receive these particulate cargoes often request specific particle sizes among the particulate cargoes mixed with various particle sizes. - For example, regarding coke, the optimum particle size for blast furnace coke is about 20 to 50 mm in order to maintain appropriate voids in the blast furnace and function as a heat source and reducing agent, and for foundry coke, it is said that the optimum particle size is about 20 to 50 mm. Compared to coke for blast furnaces, the optimum particle size is larger than coke for blast furnaces, in order to maintain voids in the melting furnace where the air volume per unit cross-sectional area is large and the metal melting rate is high, as well as to function as a heating and carburizing material. Since it is selected to be about l/12, 8 (1 to 80 mm, 8 (1 to 120 mn, 12
Coke for ferroalloys, which is used as a resistance heating reducing material in electric furnaces for producing ferroalloys such as ferrosilicon, ferromanganese, or ferrochrome, requires particle sizes of 10 to 3hm. In addition, coke with a particle size of about 30 mm is used for CO gasification of carbon such as coal, and other coke is used for calcium carbide, limestone firing, cement production, heating, etc. Different furnaces require coke with different particle sizes.

In the past, for example, coke manufactured at a coke factory or ore transported by transport ship were first transported horizontally using regular tamp trucks or railway freight cars, and then weighed using a weighing machine during transportation. Afterwards, they are piled up in a yard and stored. Then, the sorted items are loaded onto dump trucks or railroad wagons from the yard and transported to the factory, where they are unloaded from the trucks or freight cars and accumulated at a storage area within the factory. From there, the sorted materials are transported to a sorting machine in the factory by another truck or power packet, and then lowered into a hopper, fed into a sorting machine by a belt conveyor, etc., and sorted into appropriate particle sizes by sieving. It is collected by belt conveyor etc. according to particle size. The collected coke of each particle size is transported by truck or the like, and after being weighed, it is sorted within the factory and stored in a warehouse for each particle size. From there, the product is either delivered directly to the customer by truck, or transferred to a carrier and shipped around, then transported by truck and delivered to the customer.

Conventional sieving equipment for granular materials was fixedly installed in the factory, and as mentioned above, the cargo was unloaded and unloaded many times before it was transported to the factory, which caused damage to the cargo. is large, increasing the loss of fine particles during transportation, causing dust scattering, and
There was also a high possibility that foreign matter might be mixed in. Furthermore, each time the cargo is transshipped, space is required for storage and management, which also requires a lot of labor. In addition, in conventional sieving equipment, the input position of granular materials and the discharge position of the sorted granular materials are fixed in a fixed positional relationship, and even if the sieving equipment is relocated, the raw material collection location and sorting location at the work site are fixed. There has been a problem in that it is not always possible to take the optimal working position with respect to the positional relationship with the goods storage area.

In view of this situation, the present inventor developed a mobile sieve that efficiently sorts agricultural products such as grains or granular materials such as coke and ores at any time in their production, accumulation, or consumption areas without loss of cargo. Separate device or patent application No. 2-950
It is offered as No. 54.

[Problems to be Solved by the Invention] However, in the mobile sieving device, the sieving area of the vibrating sieve machine, which is movable and can be installed in the form of a chassis, is determined. On the other hand, the objects to be processed by the sieve are not fixed, and may vary depending on the size, shape, specific gravity, and viscosity of granular materials (clumps caused by moisture and freezing), and even if the objects are the same, they may differ on-site. It differs depending on the atmosphere (weather, 7 degrees, etc.).

In addition, since the sieve area is determined, in order to increase the sieve efficiency, the residence time on the top surface of the sieve should be lengthened, and conversely, in order to increase the sieve throughput, the residence time on the top surface of the sieve should be shortened. Among these conflicting requirements, the optimal conditions must be selected depending on the object to be treated and the on-site atmosphere.

The present invention was developed as a result of intensive research by the inventor, and the optimum sieving speed for granular materials having different particle sizes, densities, etc.
The present invention provides a mobile sieving device with selectable efficiency and a sieving method thereof.

[Means for Solving the Problems] The mobile sieving device according to the invention according to claim 1 of the present application includes: a receiving hopper mounted on the front part of a vehicle chassis that can run; and a lower outlet of the hopper. a variable speed conveyor installed in the middle of the chassis with an upward slope toward the rear so as to send the granules discharged from the hopper outlet by the variable speed feeder to the rear of the chassis; , mounted on the rear part of the chassis so as to receive the granular material falling from the rear end of the variable speed conveyor at the rear part and sift it while flowing it forward; a vibrating sieve machine which can be changed; and a vibrating sieve machine installed on the chassis in a space below the feed conveyor in the width direction of the chassis so as to receive the granules sieved by the vibrating sieve machine in front of the vibrating sieve machine. and a discharge container disposed so as to be able to be pulled out on either side in the width direction of the chassis.

Further, in a mobile sieving device according to a second aspect of the invention, in the device according to the first aspect, the vibration direction of the vibrating sieve can be reversed.

Further, in the mobile sieving device according to the invention according to claim 3, in the device according to claim 1 or 2, the vibrating sieve machine has a plurality of stages of sieves, and the sieve particulate matter at each node is removed. A plurality of the width direction discharge conveyors which can be reversed for discharge are arranged in parallel.

Furthermore, in the mobile sieving device according to the invention set forth in claim 4, in the device set forth in any one of claims 1 to 3, the vibrating sieve machine includes a receiving plate and a sieve surface for receiving granular materials that are dropped and supplied. A weir plate extending in the width direction is provided protrudingly between and/or on the sieve surface.

Further, in the mobile sieving apparatus according to the invention set forth in claim 5, in the apparatus set forth in claim 4, when the variable speed conveyor vibrates the receiving plate, the granules blocked by the dam plate are removed. A fixing member is provided at an interval above the receiving plate from the end of the variable speed conhair to the receiving plate so as to destroy the variable speed conhair.

The mobile sieving device according to the invention according to claim 6 is the device according to claim 1, further comprising a delivery amount adjusting plate provided at the outlet of the hopper and adjusting the delivery amount of the variable speed feeder. It is something that

Further, in the sieving method using the mobile sieving device according to the invention according to claim 7, in the sieving method using the mobile sieving device according to claim 1, the sieve of the vibrating sieve machine is By adjusting at least any of the sieve size, inclination angle, frequency, and vibration direction of the sieve surface, the granules are dispersed over the entire sieve surface, and the amount of granules processed per unit time is determined. Adjust the amount of granular material discharged by the variable speed feeder so as not to exceed the throughput.

This method adjusts the transfer speed of the variable speed conhair to send the discharged granules to the downstream vibrating sieve machine without delay, and discharges the granules from the vibrating sieve machine to the discharge conveyor without delay.

[Function] Since all the elements of the mobile sieving device according to the present invention are mounted on a vehicle chassis that can travel, the sieving area of the vibrating sieving machine mounted on the tower is determined.

On the other hand, in the mobile sieving device according to the present invention, the processing target to be sieved is not determined, and the size, shape, and
Not only do they differ depending on their specific gravity and viscosity (clumping caused by moisture and freezing), but they also vary depending on the on-site atmosphere (weather, humidity, etc.) even for the same object. In addition, since the sieve area is determined, the residence time on the top surface of the sieve must be lengthened in order to increase the nodal rate, and conversely, the residence time on the top surface of the sieve must be shortened in order to increase the sieve throughput. Among these conflicting requirements, the optimal conditions must be selected depending on the object to be treated and the atmosphere at the site.

Therefore, in the device according to the present invention, at least one of the sieve size, inclination angle, and vibration frequency is adjusted so that the entire sieve surface of the vibrating sieve machine is used in order to improve both the moderation rate and sieve processing capacity. A changeable vibrating sieve is used, and a variable speed feeder and a variable speed conveyor supply granules that match the throughput of the vibrating sieve and discharge them out of the device without delay. The optimum sieving speed and efficiency can be selected for granules with different particle sizes, densities, etc.

More preferably, the vibration direction of the vibrating sieve machine is reversible, and the vibrating sieve machine has multiple stages of sieves, and a plurality of reversible width direction discharge conveyors are arranged in parallel in order to discharge the particulate matter on the sieves in each city. The vibrating sieve machine is equipped with a weir plate extending in the width direction between the receiving plate and the sieve surface and/or on the sieve surface to protrude in the width direction. Because it is equipped with a mobile sieving device, the entire sieving surface of the vibrating sieving machine can be used effectively, improving the power saving rate and sieving throughput. Efficiency can be easily selected.

Preferably, the variable speed conveyor is spaced above the backing plate from an end of the variable speed conveyor toward the backing plate so that when the backing plate vibrates, it destroys the granules blocked by the backing plate. Since the movable sieving device is equipped with at least one of the openings and the fixing member, it is possible to feed the granular material to the sieve surface while crushing the granular material, for example, Even if the particles become lumps or are large due to moisture or freezing, the fixing member crushes the particles blocked by the weir plate and feeds them to the sieve surface.
Less reduction in moderation rate.

In addition, since the hopper outlet is equipped with a delivery rate adjusting plate for adjusting the delivery rate of the variable speed feeder, it is possible to supply granular material in accordance with the throughput of the vibrating sieve machine.

Furthermore, in the method according to the present invention, in the sieving method using the mobile sieving device; Distributing the particulate matter over the entire surface and determining the amount of particulate matter to be processed per unit time: Adjusting the amount of particulate matter discharged from the variable speed feeder so as not to exceed the determined throughput amount:
The granules to be discharged are sent to the downstream vibrating sieve machine without delay by adjusting the transfer speed of the variable speed conveyor; the granules are discharged from the vibrating sieve machine to the discharge conveyor to the outside of the apparatus without delay; The optimum sieving speed and efficiency can be selected for granules having different particle sizes, densities, etc.

[Example] An example of the present invention will be described below with reference to the drawings.

1 and 2 are a side view and a top view showing an embodiment of the present invention. In this embodiment, a case where the trailer is towed by a towing vehicle 300 as shown in FIG. 3 is used as an example. There is.

In the figure, a receiving hopper 14 whose upper side wall can be folded by a hinge 12 is mounted on the vehicle body chassis 10 at the front part, and a two-stage sieving machine 16 is mounted at the rear part.
A heald conveyor 22 for feeding, which communicates between the hopper outlet 18 facing toward the rear of the vehicle and the input material receiving section 20 at the rear upper part of the vibrating sieve machine 16, is mounted inside the chassis and facing toward the rear. It is set up on an upward slope.

The hopper 14 is equipped with a variable speed plate feeder 24 on the bottom surface that reciprocates in the longitudinal direction of the vehicle. Adjust. The opening of the hopper discharge port 18 at the tip of the feeder 24 is opened and closed by a hydraulic operating device 17. The conveying belt conveyor 22 can be adjusted by changing the conveyance of the belt, and can be bent upside down using the front part as a fulcrum. During work, it is raised to a predetermined height as shown in Figure 2, and when driving on public roads, it is held with the top lowered as shown in Figure 3. The rear lower part of the belt conveyor 22 is a space for installing a sieving machine 16, and the sieving machine 16 is an electric motor-driven inclined vibrating sieve that can be rotated in forward and reverse directions. and a relatively fine lower sieve, and the sieve material discharge port 26 of the upper sieve and the sieve material discharge port 28 of the lower sieve face the front of the chassis. This vibrating sieve 1'6 is also rainbow-shaped so that the inclination can be changed around the vibrating rotation axis, and the sorting characteristics can be selected by setting the inclination according to the properties of the granular material. As you can see from the comparison, the overall height can be changed between when working and when driving. At the lower part of the belt conveyor 22 and in front of the vibrating sieve machine 16, two discharge belt conveyors 30.32 are provided facing in the vehicle width direction to receive the particulate matter from each of the discharge ports 26.28. These discharge belt conveyors 30, 32 are slidable so as to be pulled out to either the left or right side on the chassis, as shown by broken lines in FIG. The unscreened products of the lower sieve of the vibrating sieve machine 16 can be taken out from the bottom of the vibrating sieve machine 16 to the rear of the chassis by another discharge belt conveyor 34.

The feeder 24 and each belt conveyor 22°30.32
The vibrating sieve 16 is driven by power supplied from a generator 36 mounted on the chassis 10, and these speed adjustment operations can be performed near the generator 36 or from the driver's seat.

In Fig. 2, 38 and 40 are provided at the four corners of the front and rear of the chassis, each of which can be extended to maintain the horizontal stability of the vehicle body during work.

Now, granules are loaded from the pile into the hopper 14 at the front of the chassis using a power shovel or another converter. This is convenient because it eliminates the need to raise the lifting height of excavators and the like so much. Further, steel rods 13 placed at equal intervals near the hinge 12 of the hopper 14 are used to remove large particles that cannot be discharged from the opening of the hopper outlet 18.

When granules are fed into the hopper 14 with the feeder 24, the belt conveyors 22, 30° 32, and the vibrating sieve 16 started at predetermined set speeds, the granules fed in fixed quantities from the hopper outlet by the feeder 24 are transferred to the belt conveyor. 22 reaches the upper part of the rear part of the vibrating sieve machine 16 on an upward slope, and falls from there to the input material receiving part 20 in the vibrating sieve machine 16.
will be put into the

In the vibrating sieve machine 16, depending on the rotational direction of the vibrating motor, the sieve rotates vertically to provide feed in the direction of flow of the granular material, or vertically oscillates to provide braking, and the sorting characteristics can also be selected based on this. The upper sieve amount sorted by the upper sieve of the vibrating sieve machine 16 is discharged from one discharge port 26 onto the discharge belt conveyor 30, and the unsieved amount is sorted by the lower sieve and the sieve upper amount is discharged from the other discharge port. 28 and is discharged onto another discharge belt conveyor 32. The sorted products received by these belt conveyors 30 and 32 are sent out to the side of the chassis, and transferred to a predetermined collection location or directly to a transport vehicle by a transfer conveyor (not shown) or the like. The sifted amount of the lower sieve of the vibrating sieve machine 16 is taken out from the bottom of the vibrating sieve machine 16 to the rear by another discharge belt conveyor 34.

FIG. 4 is a side view of a main part of the present invention, FIG. 5 is a top view thereof, and FIG. 6 is a side view of another main part.

The weir plate 19 erected between the receiving plate 21 on the bottom surface of the input material receiving part 20 and the sieving surface 15 of the vibrating sieve machine 16 is connected to the belt container 2.
The particulate matter 11 falling from 2 is dammed. The dammed granules 11 are vibrated to the notches 23 at both ends of the dam plate I9.
Since the particles are fed to the sieve surface 15 at the same time, they are arranged in a mountain shape on the surface of the receiving plate 21. Further, the granules supplied from the belt conveyor 22 are arranged on the receiving plate 21.
1, and the impact of the fall is absorbed by the aligned granules 11, and the amount is not directly transmitted to the plate 21. The granules 11 that are not lined up on the receiving plate 21 either go over the weir plate 19 and are supplied to the sieve surface 15, or pass through the notches 23 arranged at both ends of the weir plate 19 and are supplied to the sieve surface 15. . This notch 23 allows the granules 11 to be supplied to the sides of the sieve surface 15, allowing the sieve surface 15 to be used effectively.

Further, a sieve surface weir plate 29 is provided over the entire width of the sieve surface 15. This sieve surface weir plate 29 has three arcuate cuts on its upper edge to provide directionality in the flow of the transferred granules to the sieve surface, thereby forming areas where it is easy to climb over this sieve surface weir plate 29. There is. By selecting such a sieve surface weir plate, the entire sieve surface can be used, and the sieve efficiency can be improved. Incidentally, the above amount may be determined by cutting off the upper edge of the weir plate 19 installed between the plate 21 and the sieve surface 15, if necessary. You may provide more than one.

In addition, due to the displacement of the receiving plate 21 due to vibration, the weir plate 19
A fixing member is installed at intervals above the receiving plate 21 from the end of the belt conveyor 22 toward the receiving plate 21 so as to crush the granules 11 that are dammed in a chevron shape on the surface of the receiving plate 21. 25 is provided 6. For example, even if the large granules 11 have become lumps due to moisture or freezing, the fixing member 25 crushes the granules 11 that are dammed in a chevron shape by the dam plate 19 and feeds the granules 11 to the sieve surface 15. As a result, the sieving efficiency is less likely to be lowered. Note that the fixed member 25 has a bent portion 27.
By folding it up, it is constructed so that it does not get in the way even when it is not needed.

In the mobile sieving device having the above configuration, all elements are mounted on a vehicle chassis that can travel, so the sieving surface performance of the mounted vibrating sieving device is determined. On the other hand, the objects to be processed by the sieve are not fixed, and the size and
Not only do they differ due to shape, specific gravity, and viscosity (clumping phenomenon caused by moisture and freezing), but even for the same object, they differ depending on the surrounding atmosphere at the site (weather, humidity, etc.). In addition, since the sieve surface ratio is determined, in order to increase the sieve efficiency, the residence time on the top surface of the sieve must be lengthened, and conversely, in order to increase the sieve throughput, the residence time on the top surface of the sieve must be shortened. Among these contradictory requirements, the optimal conditions must be selected depending on the object to be treated and the on-site atmosphere.Therefore, in the 8-motion sieving device of the present invention, the best sieving efficiency of the vibrating sieving machine and the best sieving In order to obtain throughput, the entire sieve surface of the vibrating sieve machine is effectively used. This is achieved by changing the sieve size, inclination angle, and vibration frequency of the vibrating sieve machine as necessary, and reversing the vibration direction forward and backward. By protruding a weir plate extending in the width direction between and/or on the sieve surface,
The best activity rate and best sieving capacity of the vibrating sieve machine will be determined. The amount of granules to be processed per unit time according to the determined conditions is calculated, the amount of granules to be discharged from the hopper 14 is adjusted so as not to exceed the calculated amount of throughput, and the amount of granules to be discharged is The transfer speed of the variable speed conveyor is adjusted to send the material to the downstream vibrating sieve without delay, and from the vibrating sieve to the discharge conveyor, the material is discharged from the apparatus without delay.

[Effects of the Invention] As described above, the device according to the present invention has a
In order to improve both sieve processing performance, we use a vibrating sieve machine that can change at least any of the sieve size, inclination angle, and vibration frequency so that the entire sieve surface of the vibrating sieve machine is used. The variable speed feeder and variable speed conveyor supply granular material commensurate with the throughput of the sieving machine and discharge it outside the device without delay, making it ideal for sieving granular materials with different particle sizes, densities, etc. The speed and efficiency of sieving can be selected.

Further, in the method according to the present invention, in the sieving method using the mobile sieving device: at least one of the sieve mesh, inclination n: 1 angle, vibration frequency, and vibration direction of the sieve surface of the vibrating sieve is adjusted. Then, the particulate matter is dispersed over the entire sieve surface, and the throughput of the particulate matter per unit time is determined; Adjust: Adjust the transfer speed of the variable speed conveyor to send the discharged granules to the downstream vibrating sieve machine without delay: Discharge the granules from the vibrating sieve machine to the discharging conveyor without delay. Therefore, there is an advantage that the optimum sieving speed and efficiency can be selected for granular materials having different particle sizes, densities, etc. to be sieved.

[Brief explanation of the drawing]

FIG. 1 is a side view showing one embodiment of the present invention, FIG. 2 is a top view, FIG. 3 is a side view showing the running state, FIG. 4 is a side view of a part of the present invention, and FIG. The figure is a top view, and FIG. 6 is a side view of another main part. (Explanation of symbols of main parts) 10 rainbow, 14: receiving hopper, 16: vibrating sieve 1!
, 22: Feeding belt conveyor, 24: Feeder, 30
, 32: Discharge belt conveyor, 34: Another discharge belt conveyor. Figure 5 Agent: Patent Attorney Tadashi Sato Figure 6

Claims (7)

[Claims] (1) A receiving hopper mounted on the front part of a vehicle chassis capable of driving; a variable speed feeder provided at a lower outlet of the hopper; and a granular material discharged from the hopper outlet by the variable speed feeder. a variable speed conveyor installed in the middle of the chassis with an upward slope toward the rear so as to send the granules to the rear of the chassis; a vibrating sieve machine which is capable of changing at least one of the sieve size, inclination angle, and vibration frequency and is mounted on the rear part of the chassis so as to sieve the granules while flowing down; and a discharge conveyor provided on the chassis in a space below the feed conveyor in the width direction of the chassis so as to receive the waste in front of the sieving machine, and disposed so as to be able to be pulled out on either side in the width direction of the chassis. A mobile sieving device characterized by: (2) The mobile sieving device according to claim 1, wherein the vibration direction of the vibrating sieve is reversible. (3) Claim characterized in that the vibrating sieve machine has a plurality of sieves, and a plurality of the widthwise discharge conveyors that can be reversed to discharge the sieve particles of each sieve are arranged in parallel. 3. The mobile sieving device according to 1 or 2. (4) A claim characterized in that the vibrating sieve machine is provided with a weir plate extending in the width direction protruding between and/or on the sieve surface and a receiving plate for receiving falling granular material. Items 1 to 3
The mobile sieving device according to any one of the above. (5) so that the variable speed conveyor destroys the granular material dammed by the dam plate when the receiving plate vibrates;
5. The mobile sieving device according to claim 4, further comprising a fixing member provided at an interval above the receiving plate from an end of the variable speed conveyor toward the receiving plate. (6) The mobile sieving device according to claim 1, further comprising a delivery amount adjusting plate provided at the outlet of the hopper to adjust the delivery amount of the variable speed feeder. (7) In the sifting method using the mobile sifting device according to claim 1, the sieving surface of the vibrating sifter is adjusted at least in any one of the sieving size, inclination angle, frequency, and vibration direction. , dispersing the particulate matter over the entire sieve surface, determining the throughput of the particulate matter per unit time, and adjusting the discharge amount of the particulate matter of the variable speed feeder so as not to exceed the determined throughput amount; The mobile type is characterized in that the granules to be discharged are sent to a downstream vibrating sieve machine without delay by adjusting the transfer speed of the variable speed conveyor, and are discharged from the vibrating sieve machine to the discharge conveyor without delay. A sieving method using a sieving device.