JPH0318951B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a sieving device for sieving granular materials such as aggregate or soil used as an asphalt paving material, and particularly relates to a technique for improving sieving efficiency.

<Prior Art> The following is a conventional example of a sieving device.

That is, a net-like sieve body is arranged substantially horizontally, and granular materials such as aggregates are placed on the upper surface thereof. Then, the sieve body is swung at a predetermined period in a horizontal plane with the center of the sieve body as the oscillation axis, and minute particles are allowed to fall from the sieve body through the mesh.

Then, the particle size of the granules is determined from the amount of the granules that have fallen from the sieve body and the amount of the granules that have been supplied to the sieve body.

<Problems to be Solved by the Invention> However, in such conventional sieving devices, the sieve body is swung in a horizontal plane to allow minute particles to pass through the mesh of the sieve body and fall from the sieve body. However, it takes a long time to sieve, and the sieving is not sufficient, requiring additional manual sieving. In addition, if there is dust attached to the granules, wash the granules with water and dry them before sieving. As a result, it takes a long time to detect the particle size of granules, and the washing and drying operations become complicated.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a sieving device that can improve sieving efficiency.

<Means for Solving the Problems> For this reason, the present invention provides a cylindrical sieve body on which particulate matter is placed and whose upper surface is disposed substantially horizontally, and a bottom wall of the sieve body. a support member that supports the sieve body via a sliding body so as to slide the sieve body in a substantially horizontal direction and supports the sieve body with a predetermined play with at least the upper and lower portions of the outer peripheral wall of the sieve body; a reciprocating device that reciprocates in at least one substantially horizontal direction at a predetermined period; a cleaning device that supplies a cleaning liquid to the granular materials placed on the sieve body to clean the granular materials; a drying device for drying granular materials; a cleaning operating device for operating the cleaning device and the drying device depending on whether or not there is a need to wash the granular materials; A sifting actuating device for actuating the reciprocating device is provided.

<Function> In this way, when cleaning of the granules is necessary, the granules are washed and dried, and when cleaning is not necessary, the sieve body is centered approximately on the vertical axis without washing and drying the granules. The filter is reciprocated in at least one of the horizontal directions while being rotated to improve the sieving efficiency of granular materials.

<Examples> Examples of the present invention will be described below based on the drawings.

1 to 4 show an embodiment of the present invention.

In the figure, an actuator 2 is provided on the side of a hollow bracket 1, and the output shaft of this actuator 2 faces inside the bracket 1. A pair of first head gears 3 are attached to the output shaft of the actuator 2, and second head gears 4 are meshed with the first head gears 3, respectively.

On the other hand, on both sides of the bracket 1 there are struts 5,
6 are erected, and shafts 7 are vertically extended and rotatably attached to these supports 5 and 6, respectively. The second shaft gears 4 are attached to the lower ends of these shafts 7, respectively. Disc-shaped eccentric cams 8 are attached to the upper end and intermediate portion of each shaft 7, respectively.

Further, a plate-shaped first swinging bracket 9 is attached to the bracket 1 so as to be able to swing freely in a horizontal plane around its center.
A pair of fixed shafts 10 and 11 are erected at equal distances from the swing axis of the first swing bracket 9. These pair of fixed shafts 10,1
A plate-shaped second swing bracket 12 is attached to the upper end of the swing bracket 1. Opening grooves are formed on both side edges of the first and second swing brackets 9 and 12, respectively, and the eccentric cams 8 are respectively engaged with these opening grooves.

A cylindrical saucer 13 is attached to the lower part of the fixed shafts 10, 11 so as to span the fixed shafts 10, 11. An annular ball bearing 14 as a sliding body is mounted on the bottom wall of the saucer 13.
is placed almost horizontally. As shown in FIGS. 2 and 3, this ball bearing 14 is constructed by having a plurality of steel balls 14b rotatably attached to a ring-shaped steel support member 14a at predetermined intervals.

Then, the actuator 2 causes the second cap gear 4 to
When the brackets are rotated, the first and second swing brackets 9, 12 swing in a horizontal plane about their central axes.

Further, a plurality of cylindrical sieves 15 are provided, and sieve bodies (not shown) each having a predetermined mesh size are stretched over the bottom walls of these sieves 15. The sieve body is arranged approximately horizontally. These sieves 15 are stacked as shown in FIG. 1 and placed on a ball bearing 14 placed on the tray 13. Here, the mesh size of the sieve body becomes smaller from the upper stage side to the lower stage side.

Further, while a predetermined play l ₁ is formed between the outer circumferential wall of the lowermost sieve 15 and the inner circumferential wall of the saucer 13,
The outer peripheral wall of the top sieve 15 and the second swing bracket 1
A predetermined play l ₂ is formed between the inner circumferential wall of No. 2 and the inner circumferential wall of No. 2. Here, the play l ₁ on the bottom side is the play on the top side.
l is larger than ₂ .

A discharge port of a water supply pipe 16 is located above the sieve 15, and a first on-off valve 17 is interposed in the water supply pipe 16. The water supply pipe 16 and the first on-off valve 17 constitute a cleaning device.

Further, a hot air generator 18 as a drying device is provided. One end of a hot air supply pipe 19 is connected to the discharge port of this hot air generator 18, and the pipe 1
The other end of each sieve 9 is attached to the bottom wall of the saucer 13 so that hot air is blown upward and passes through each sieve 15.

Further, a drainage pipe 20 is connected to an intermediate portion of the hot air supply pipe 19, and a second on-off valve 21 is interposed in the drainage pipe 20.

The actuator 2 and the first and second on-off valves 1
7 and 21 and the hot air generator 18 are operated by control signals from a control device 22. The control device 22 operates according to the flowchart shown in FIG. 4 when a switch for starting work is turned on. Further, the control device 22 is provided with a time adjustment knob so that the operating time of each device including the actuator 2, the first and second on-off valves 17 and 21, and the hot air generator 18 can be arbitrarily set. The control device 22 thus constitutes a washing actuator and a sieving actuator. In addition, the control device 2
2 is provided with a water washing instruction switch.

Next, the operation will be explained according to the flowchart of FIG. 4 and the time chart of FIG. 5.

First, aggregate in the form of granules is supplied to the uppermost sieve 15. Then, when the work start switch of the control device 22 is turned on, the control device 22 operates according to the flowchart shown in FIG.

In S1, it is determined whether or not the aggregate needs to be washed with water. If YES, proceed to S2, and if NO, proceed to S2.
Proceed to step 3. This water washing judgment is made when it is determined that water washing is necessary when the water washing switch is turned on.
It is determined that washing with water is not necessary when it is turned off.

In S2 and S3, the actuator 2 is actuated.

In S4, the first on-off valve 17 is opened with a delay of a predetermined time T _W1 (see FIG. 5) from the start of operation of the actuator 2. As a result, water is supplied to the sieve 15 from the water supply pipe 16, the water flows downward through the sieve 15, and washing of the aggregates is started.

In S5, the second on-off valve 21 is opened with a delay of a predetermined time T _E1 from the start of operation of the actuator 2 . As a result, water flowing down through the sieve 15 flows from the saucer 13 into the drain pipe 20 via the hot air supply pipe 19, and then is discharged outward from the drain pipe 20.

In S6, it is determined whether or not the set washing time T _W has elapsed. If YES, the process proceeds to S7, and if NO, the process returns to S4 to continue water supply.

In S7, the first on-off valve 17 is closed to stop washing with water, and then the process proceeds to S8.

In S8, it is determined whether or not the draining time T _W has elapsed. If YES, the process proceeds to S9, and if NO, the process returns to S5 to continue draining.

In S9, the second on-off valve 21 is closed to stop drainage, and then the process proceeds to S10.

In S10, the operation of the hot air generator 18 is started almost simultaneously with the stoppage of drainage, and the process proceeds to S11.

In S11, it is determined whether or not the drying time T _D has elapsed. If YES, the process proceeds to S12; if NO, the process returns to S10 and the operation of the hot air generator 18 is continued.

In S12, the operation of the hot air generator 18 is stopped, and then the process proceeds to S13.

In S13, it is determined whether or not the sieving time T _F has elapsed. If YES, the process proceeds to S14; if NO, the process proceeds to S3, and the operation of the actuator 2 is continued.

In S14, the operation of the actuator 2 is stopped.

In this way, when the actuator 2 is operated for the screening time T _F , the driving force is transmitted to the second cap gear 4 via the first cap gear 3 and the shaft 7
is driven to rotate. An eccentric cam 8 attached to the shaft 7 causes the first and second swing brackets 9 and 12 to swing at a predetermined period (corresponding to the number of rotations of the actuator 2) in a horizontal plane with their central portions as the swing axis. move.

Accompanied by this rocking, the saucer 13 attached to the fixed shafts 10 and 11 swings about its cylindrical shaft as a rocking axis, and this rocking force is transmitted to the sieve 15 via the ball bearing 14.

Since the sieve 15 is swung about the center axis of the sieve 15, the sieve body also tends to oscillate at a predetermined period in a substantially horizontal plane.

At this time, the outer peripheral wall of the lowermost sieve 15 and the saucer 13
The play l ₁ with the inner peripheral wall is larger than the play l ₂ between the outer peripheral wall of the uppermost sieve 15 and the inner peripheral wall of the second swing bracket 12, and the sieve 15 is placed on the ball bearing 14. Therefore, the sieve 15 swings in a horizontal plane and swings at a predetermined period in a substantially vertical plane centered on the second swing bracket 12 side.

Therefore, the sieve body also oscillates in a substantially horizontal plane at a predetermined period with the central part of the sieve body as the oscillating axis, and also oscillates (reciprocatingly) in an approximately vertical plane centering on the second oscillating bracket 12 side. verb) to do. Therefore, the actuator 2, the first and second swing brackets 9, 1
2 constitutes a reciprocating device. In addition, the fixed shafts 10 and 11, the second swing bracket 12, and the saucer 13
constitutes a support member. In addition, the saucer 13 is passed through a sieve 15.
A saucer 13 may be integrally attached to the lower part of the main body, and this saucer 13 may be supported via a ball bearing 14.

As a result, the aggregate placed on the sieve body moves while swinging in a substantially horizontal plane on the sieve body,
The lower aggregate is shaken up and moved to the upper part of the aggregate. By such movement of the aggregate, the sieving of the aggregate can be carried out sufficiently in a short time, the sieving efficiency can be improved, and the particle size test can be carried out in a short time.

Experimental data on such sieving efficiency are shown in FIG. In other words, the sieving efficiency of the device of this embodiment (shown by the solid line in FIG. 6) is higher than that of the conventional device in which the sieve body is oscillated only in a substantially horizontal plane (shown by the chain line in FIG. 6). Improving dramatically.

In addition, when dust is attached to the aggregate,
Since the sieve 15 is washed with water and then dried while being oscillated, the efficiency of washing and drying operations is greatly improved and these operations can be carried out in a short time.

Note that examples of the granular material include soil used in asphalt paving materials.

<Effects of the Invention> As explained above, in the present invention, after washing and drying the granular material as necessary,
Since the sieve body is rotated about a substantially vertical axis and reciprocated in at least one horizontal direction at a predetermined period, the sieving work for granular materials can be done in a short time, and the sieving efficiency can be easily improved. In addition to improving the structure, even if dust is attached to granules, washing and drying can be performed efficiently and sieving efficiency can be improved.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of the present invention, and FIG.
The figure shows the main parts of the same as above, Fig. 3 is a plan view of Fig. 2, Fig. 4 is a flow chart of the same as above, Fig. 5 is a time chart of same as above, and Fig. 6 is a diagram showing sieving efficiency. be. 2... Actuator, 9... First swing bracket, 12... Second swing bracket, 15...
Sieve, 16...Water supply pipe, 17...First on-off valve, 18...Hot air generator, 22...Control device.

Claims (1)

[Claims] 1. A cylindrical sieve body on which particulate matter is placed and whose upper surface is disposed substantially horizontally, and a bottom wall of the sieve body via a sliding body to slide the sieve body in a substantially horizontal direction. a support member that supports the sieve body with a predetermined play with at least the upper and lower portions of the outer peripheral wall of the sieve body; and a reciprocating device that reciprocates the support member in at least one substantially horizontal direction at a predetermined period. a washing device that supplies a washing liquid to the granular material placed on the sieve body to wash the granular material; a drying device that dries the washed granular material; and a drying device that dries the washed granular material; A cleaning actuating device that operates depending on whether or not there is a need to wash items, and a sifting actuating device that operates the reciprocating device to sieve granular materials after drying or not yet washed. Characteristic sieving device.