JPH0557247A - Trommel - Google Patents

Abstract

PURPOSE:To prevent the screen from being disabled by blinding when raw material includes moisture in the case of screening sand, etc., by a trommel. CONSTITUTION:An oscillating axis 13 is arranged parallel to a cylindrical screen 4 and a striking arm 16 for striking the cylindrical screen 4 is provided on the oscillating axis 13. A roller driven part 12 at the end of an oscillating arm 14 fixed to the oscillating axis 13 is moved forward and backward by a plate cam 11 provided on the cylindrical screen 4. The striking arm 16 is raised by the plate cam 11, oscillated by its own weight together with the oscillating axis 13 and sunk to strike on the cylindrical screen 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary sieve (Trommel) for sieving a raw material by passing the raw material through a cylindrical screen connected to a rotary driving means.

[0002]

2. Description of the Related Art Conventionally, as a device for sieving raw materials such as soil, sand, shellfish, incineration ash from an incinerator, waste materials mixed with earth and sand, and crushed concrete, a sieve is used as a component. There are many. There are a rotary sieve, a vibrating sieve, etc. as an element which uses this screen. Examples of the vibrating sieve include a high-tech screen (trade name of Kikosha Co., Ltd.), a monolayer (trade name of EBARA CORPORATION), and a jumping screen (trade name of Yasukawa Electric Works).

Rotating sieves operate smoothly and are versatile for sieving all objects. The high-tech screen is a urethane mat screen that changes the elongation and relaxation of urethane rubber caused by the resonance mechanism into vertical movement. Monoreia has 4 sieves with many vertical piano wires.
It is used in a graded manner.

[0004]

The rotary sieve is very effective for selecting raw materials having a relatively large particle size such as crushed stone.
However, it has been considered very difficult to sift a raw material containing water and having a small particle size, and it has been considered almost impossible to sift a material having a mesh size of 3 to 5 mm by a dry method. Therefore, wet sieving is performed. Although a wet type reduces the clogging, it clogs depending on the conditions and requires a large amount of water. High-tech screens and jumping screens have the same principle of sieving action, and because they use urethane rubber, they are expensive, have the drawback of being easily broken, and are expensive to maintain. Monolayers are very expensive. None of the above-mentioned devices for selecting raw materials are suitable for the selection of raw materials containing water, and when the water content of the raw materials is likely to be just clogged, or on rainy days, the operation is stopped or the raw materials are removed by a rotary kiln or the like. Dry and sift. Kilns are extremely expensive, and fuel costs are high.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a rotary sieve which is widely used, inexpensive, and easy to manage, by providing a clogging cleaning means to the rotary sieve to prevent clogging.

[0006]

SUMMARY OF THE INVENTION A first aspect of the present invention is a cleaning method in which a raw material is passed through a cylindrical screen connected to a rotary drive device and sieved so as to remove clogging substances from the cylindrical screen. This is a rotary sieve characterized by having means.

A second aspect of the present invention is characterized in that cleaning means for acting on the cylindrical screen is provided from one or both sides of the inner and outer circumferences of the cylindrical screen. It is a sieve.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

[First Embodiment] FIG. 1 is a front view, FIG. 2 is a sectional view taken along the line AA of FIG. 1, and FIG. 3 is a left side view as seen in the axial direction of FIG. A shaft 6 fixed to a net-shaped product discharge frame 5 provided at one end of a cylindrical screen 4 is rotatably supported by a bearing 3 fixed to a bearing stand 2 provided upright on the frame 1, and the other end of the cylindrical screen 4 is supported. The screen receiving roller 8 which is in contact with the outer circumference of an annular screen support cylinder 7 having the same diameter as the screen 4 provided on the base 1 is rotatably supported by a bearing bracket 9 provided on the mount 1. The cylindrical screen 4 is made of wire mesh or punched iron plate.

The hitting means for hitting the cylindrical screen as the cleaning means for cleaning the clogging is as follows.

A plate cam 11 having a cylinder 11b having substantially the same diameter as the screen support cylinder 7 as a base circle is provided adjacent to the screen support cylinder 7, and a roller follower 12 operated by the cam 11 is mounted on a swing shaft 13. The swing arm 1 is attached to the fixed swing arm 14.
4 is fixed so that its position can be adjusted in the longitudinal direction.

The swing shaft 13 is supported by two bearings 15 fixed to a support member (not shown) standing upright from the gantry 1. A striking arm 16 is provided between the two bearings 15 so as to extend substantially in the direction of the cutting line on the outer circumference of the cylindrical screen 4, and a striking head 17 is provided at the tip of the striking arm 16. The hitting head 17 is selected from a heavy elastic body such as a rubber ball. The swing shaft 13 is arranged above the cylindrical screen 4 so that the striking head 17 taps the cylindrical screen 4 from the normal direction by its gravity. Figure 2
At the position where the striking head 17 contacts the cylindrical screen 4, as shown in FIG.
When the plate cam 11 rotates in the direction of the arrow in the figure, a plurality of cam portions 11a that are arranged outwardly from the cylinder 11b project outward in the circumferential direction of the cylinder 11b.
The roller follower 12 is rotated to rotate the shaft 13 in the clockwise direction to rotate the striking arm 16 and lift the striking head 17 in the direction away from the cylinder 11 of the plate cam.

A shaft 6 and a reduction motor 18 provided on the gantry 1.
A chain transfer device 19 is connected between the and. The upper opening of the discharge hopper 21 that receives the net-like products falling to the lower side of the cylindrical screen 4 covers the lower side of the cylindrical screen 4, and the discharge chute 22 is provided below the net-like product discharge frame 5. There is. The lower end of the raw material feeding hopper 23 that supplies the raw material to the cylindrical screen 4 through the screen supporting cylinder 7 is desired by the screen supporting cylinder 7. In the above, the common axis of the cylindrical screen 4, the net product discharge frame 5, the shaft 6, the screen support cylinder 7, and the plate cam 11 is inclined so that the screen support cylinder 7 side becomes higher.

Next, the operation of the above embodiment will be described. Now, it is attempted to obtain dry sand having a particle diameter of 4 m / m or less as raw material sand containing water to be sifted. Therefore, the mesh size of the cylindrical screen 4 is approximately 4 m / m. When the reduction motor 18 is energized, the shaft 6 receives a rotational force via the chain transmission device 19, and the shaft 6, the net product discharge frame 5, the cylindrical screen 4, the plate cam 1
1. The screen support cylinder 7 (hereinafter collectively referred to as a rotary sieving rotor) rotates. The rotary screen rotating body is supported by the screen receiving roller 8 and the bearing 3 and rotates. When the raw material is fed from the raw material feeding hopper 23, the raw material moves in the rotary sieving rotor toward the product discharge frame 5 on the net, and relatively moves in the circumferential direction on the inner circumference of the cylindrical screen 4 to form a cylindrical shape. The sand that has been sieved by the screen 4 and passed through the sieve is discharged from the discharge hopper 21, and the net products that have not passed through the sieve reach the net product discharge frame 5, and the net product 5
The space is discharged to the outside and discharged by the discharge short 22.

In the above-mentioned raw material which is easily clogged,
A part of the raw material is occluded when the cylindrical screen 4 mainly moves in the circumferential direction. During operation, the raw material is almost entirely present in the lower right quadrant of the cylindrical screen 4 in FIG. Therefore, the clogged portion of the cylindrical screen 4 moves to the upper right four-part circle side in FIG. 2, which is performing sieving, and further moves to the upper left four-part circle side. In the portion of the cylindrical screen 4 that has moved to the upper left quadrant, the cam surface gradually moves away from the center of the rotating body of the rotary sieve as it rotates, and the cam portion 11a lifts the roller follower 12. Since the swing arm 14 is swung clockwise around the swing shaft 13 and the swing shaft 13 is rotated, the striking arm 16 swings in the same direction, and the striking head 17 moves away from the cylindrical screen 4. .. And the cam portion 11 with respect to the roller follower 12
When a passes, the cam surface ends in the radial direction of the plate cam 11, so that the striking head 17 that the roller follower 12 has lifted up to the present is counterclockwise about the swing shaft 13 and its own weight. Accelerate to proceed and collide with the cylindrical screen 4 to give a blow. Due to this impact force, the sand clogging the cylindrical screen 4 jumps out from between the eyes, and the clogging is eliminated. The clogging sand falls mainly on the lower left quadrant of FIG. 2 of the cylindrical screen 4, and since this portion is the cylindrical screen 4 portion which has not been clogged effectively, the sieving action is performed, In the lower right quadrant of the shaped screen 4, the raw material moving in accordance with the inclination of the cylindrical sieving rotor is further added to perform the sieving action of the raw material.

In this embodiment, the striking means is urged by the rotation of the cylindrical sieving rotary member, and no other drive source is required. However, the plate cam 11 is not provided, and it is driven separately and the swing shaft 1
It is also possible to fix an arm similar to the swing arm 14 to 3 and drive the arm by an eccentric cam.

[Second Embodiment] FIG. 4 is a front view, and FIG. 5 is a left side view seen from the axial direction of FIG. The rotary sieve has the same configuration except for the striking means for the cylindrical sieve, and the description of the main body configuration will be omitted.

The bearing 2 has a rotary shaft 24 parallel to the cylindrical sieving rotor and axially closer to both ends of the cylindrical sieving rotor.
Supported by 5. A rotary striking wheel 26 is provided on the rotary shaft 24 at intervals. In the rotary striking wheel 26, the base of a leaf spring 28 is fixed to a boss 27 fixed to the rotary shaft 24, and a striking head 29 is detachably fixed to the tip of the leaf spring 28 by a bolt or the like (not shown). .. When the cylindrical screen 4 rotates counterclockwise as shown by the arrow in the drawing, the rotary striking wheel 26 also rotates in the same direction and the striking head 29 causes the outer periphery of the cylindrical screen 4 to rotate. In addition, the leaf spring 28 is bent by the rotation of the rotary striking wheel 26, and the striking head 29 passes through the cylindrical screen 4 while avoiding interference. The bearings 25 are respectively slidably engaged with the vertical guides 32, and the feed screws of the screw feeding device 33 provided in the guides 32 are screwed into the bearings 25 to adjust the radial distance between the bearings 25 and the rotary sieving rotor. It is possible, and the degree of impact of the impact head 29 on the cylindrical screen 4 can be adjusted.

The rotary shaft 24 is connected to a reduction motor (not shown) directly or through a power transmission device, or the rotary shaft 24
A sprocket wheel 31 is fixed to the end, and a chain is hooked between the sprocket wheel 31 and a sprocket wheel (not shown) fixed to the shaft 6 of the cylindrical sieve to rotate.
In this case, the elongation of the chain is adjusted with an idler chain wheel.

In this embodiment, as shown in FIG. 5, the rotary striking wheel 26 rotates in the same direction as the counterclockwise rotation of the cylindrical screen 4, and the striking head 29 strikes the outer circumference of the cylindrical screen 4. Knock out the sand that has clogged the eyes of the cylindrical screen 4. When the drive device is an independent device that rotates only the rotary shaft 24, the rotational speed of the rotary impacting wheel 26 can be adjusted, and the plate cam 11 need not be provided coaxially with the rotary sieving rotor as in the previous embodiment. Since it is good, it can be easily attached to existing equipment.

[Embodiment 3] FIG. 7 shows only the striking means,
FIG. 8 is a side view of FIG. 7. A rotary shaft 24 is arranged along the cylindrical screen 4 (not shown in FIG. 7).
Is supported by a bearing 25 that is adjustable in its positional relationship with respect to. Striking heads 29 are provided on the rotary shaft 24 at intervals in the axial direction and at different positions in the circumferential direction. In this embodiment, as shown in FIG. 8, the striking head 29 is provided on the rotary shaft 24 by sequentially changing the position in the axial direction at three equidistant positions. A boss 27 is provided on the rotary shaft 24, and a hitting head 29 is fixed to the boss 27. The hitting head 29 is formed by fixing a heavy object such as a rubber ball to the tip of a connecting member 30 such as a rubber rod or chain whose one end is fixed to the boss 7, but a rubber product is most suitable. The rotary shaft 24 is driven via a chain transmission device 34 by a variable speed reduction motor 35 capable of shifting at a speed of about 50 to 100 rotations / minute.

When the variable speed reduction motor 35 is driven, the rotary shaft 24 rotates in the same direction as the cylindrical screen 4 via the chain transmission device 34, and the striking head 29 swings the cylindrical screen 4 in a swung manner. Knock out the clogging sand.

[Embodiment 4] FIG. 9 is a longitudinal sectional view, and FIG. 10 is a left side view as seen from the axial direction of FIG. In this embodiment, support cylinders 7 are provided at both ends of a cylindrical sieving rotor, and the support cylinders 7 are supported by rollers 8 supported by bearing brackets 9 provided on the pedestal 1, and are substantially the same as the cylindrical screen 4. A cylindrical sieving rotor having a concentric sprocket wheel 36 is connected to the reduction motor 18 via a chain transmission device 19 with the sprocket wheel 36 as the passive side.

A striking means is provided so as to act on the inner peripheral side of the cylindrical screen 4. In the figure, the striking means in the third embodiment is provided by being inserted through the cylindrical screen 4. The rotating shaft 24 is arranged in the upper right of the cylindrical screen 4 in FIG. 10, and the arrangement relationship with the raw material feeding hopper 23 is adjusted. The bearing 25 is a bearing base 38 provided on the base 1.
Of the cylindrical screen 4 is engaged with a guide (not shown) in the same direction as the radial direction of the cylindrical screen 4 so that the position of the bearing 25 can be adjusted, and the position of the bearing 25 is adjusted by a screw feeding device 33 provided on the bearing stand 38. And it is designed to hold.

In the case of the striking means, the rotary shaft 24 is a rotary striking wheel 26 shown in the second embodiment or a striking head 29 of the third embodiment as shown in the figure, which is supported by a rubber rod or a chain. In this case, the rotation direction of the rotary shaft 24 is reverse to the rotation direction of the cylindrical screen 4.

As the cylindrical screen 4 rotates, the striking head 29 rotates and knocks the cylindrical screen 4 from the inside to knock out the clogging sand.

[Fifth Embodiment] FIGS. 11 to 14 show a fifth embodiment.

The support of the cylindrical sieving rotary member is the same as in the previous embodiment, and a rotary brush is used as a means for cleaning the clogging of the cylindrical screen 4. The rotary brush has a rotary shaft 24 disposed in the cylindrical screen 4 as in FIGS. 9 and 10, and a brush 40 having a bristle portion 39 at its tip in the radial direction is fixed to the rotary shaft 24 as shown in FIG. ing. As shown in FIG. 11, in the brush 40, the width of the bristle portion 39 in the axial direction is the same as that of each brush 39, and the bristle portions 39 are arranged so as to overlap each other.
Alternatively, as shown in FIGS. 13 and 14, radial fluffing portions 39 may be provided on the entire circumference of the boss 41 over the entire length of the rotary shaft 24. In either case, the rotation direction of the cylindrical screen 4 and the rotation direction of the rotation shaft 24 can be selected to be the same direction or opposite directions. In addition, the rotation shaft 24 is intermittently rotated and the hair transplant 3
The inner circumference of the cylindrical screen 4 may rub against the top surface of the cylindrical screen 4. The radius of the brush 40 is made slightly longer than the length of the normal line from the rotary shaft 24 to the cylindrical screen 4 so that the flocked portion 39 slides along the inner circumference of the cylindrical screen 4 by sliding.

In this embodiment, when the rotating directions of the cylindrical screen 4 and the brush 40 are the same, the brush 40 acts on the cylindrical screen 4 for a long time, and when the brush 40 is stopped, the surface of the cylindrical screen 4 is changed. The brush 40 is continuously rubbed. When the brushes 40 of the cylindrical screen 4 are rotated in opposite directions to each other, the brushes 40 rub against the inner periphery of the cylindrical screen 4 at a high speed, so that the force for removing the clogging is large and the brush 40 does not move in the circumferential direction as shown in FIG. When the flocked part 39 is continuously present, the flocked part 39 also has a function of tapping the cylindrical screen 4 at the beginning of the action, so that both the effects of cleaning by hitting and rubbing are provided.

In the embodiment, both the striking means and the rubbing means clean the cleaning means continuously while the cylindrical sieving rotor is in operation. However, the reduction motor for driving the rotary shaft 24 with the time limit means is intermittently operated. The durability of the cleaning means can be increased by operating in accordance with the degree of clogging.

In the embodiment, the cleaning means is provided on either the inner or outer peripheral side of the cylindrical sieving rotor, but the cleaning means may be provided on the inner or outer peripheral side, for example, as the striking means on the outer peripheral side. If any one of No. 3 and the brush of Example 5 is provided on the inner peripheral side as the cleaning means, the cleaning means for clogging becomes extremely effective.

[0032]

Since the present invention is provided with the cleaning means for the cylindrical screen of the cylindrical sieve, the cylindrical sieve, for example, having 3 to 3 eyes.
Even if it is a cylindrical screen made of 4 mm wire mesh or punched iron plate, it does not cause clogging,
Water-containing raw materials can be screened.

If a cleaning means for the cylindrical screen is provided on the outer peripheral side of the cylindrical screen, the installation is easy, and it is easy to attach it to the existing equipment. Further, if a cleaning means for the cylindrical screen is provided on the inner peripheral side of the cylindrical screen, the scattering of sand is small and it is good for the environment.

If cleaning means are provided on the inner and outer peripheral sides of the cylindrical screen, the effect of removing clogging is remarkable.

As a result of the above, the proportion of the under-net products to be sorted by passing through the cylindrical screen is increased, the particle size dispersion value of the sand under the under-net products is also reduced, and so-called good quality sand with uniform grains is obtained. can get.

[Brief description of drawings]

FIG. 1 is a front view of a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a left side view of FIG.

FIG. 4 is a front view of the second embodiment.

FIG. 5 is a left side view of FIG.

6 is a sectional view taken along line BB of FIG.

FIG. 7 is a front view showing a hitting means according to a third embodiment.

FIG. 8 is a left side view of FIG.

FIG. 9 is a front view of the fourth embodiment.

FIG. 10 is a left side view of FIG.

FIG. 11 is a front view of the fifth embodiment.

FIG. 12 is a side view of FIG. 11.

FIG. 13 is a vertical sectional view of a modification of the fifth embodiment.

FIG. 14 is a side view of FIG.

[Explanation of symbols]

 4 Cylindrical Screen 11 Plate Cam 12 Roller Follower 13 Swing Shaft 16 Striking Arm 26 Rotating Striking Vehicle 28 Leaf Spring 29 Striking Head 39 Flocking Part 40 Brush

Claims (2)

[Claims] 1. A rotary sieve for passing a raw material through a cylindrical screen connected to a rotary drive device and sieving the raw material, wherein cleaning means for removing clogging substances of the cylindrical screen is provided. 2. The rotary sieve according to claim 1, further comprising cleaning means for acting on the cylindrical screen from any one or both sides of the inner and outer circumferences of the cylindrical screen.