JPH0474544A - Aggregate recovery device - Google Patents

Abstract

PURPOSE:To prevent sludge treating ability and sand recovery rate from being lowered by a method wherein a meter for measuring the amt. of sludge to be introduced into a rotating drum and a transmission of a prime mover for driving the rotating drum is connected together in an operative association and a trommel is provided in a trommel tank coaxially therewith, freely rotatably and somewhat changeably in torsional angle relative to the axis of the trommel. CONSTITUTION:To recover aggregate, a rotating drum 1 is kept rotating at a predetermined speed of revolution and sludge 15 is placed on the bottom part of a mixing and washing tank 4 and mixed and washed by a screw coveyor provided on the inner wall thereof. The aggregate consisting of gravel 17 and sand 18 are thereafter swept up from the bottom to the top of the tank by a scraping blades 19, an opening part 19a is set downwards and the aggregate is dropped onto the upper side 20a of a pyramid-shaped guide cylinder 20 provided at the axial part thereof. The aggregate is transferred by the screw conveyor 24 from its upstream end part 6a to the downstream end part 6b while being washed with a fresh water 23 supplied from a water feed pipe 22, during which time the gravel and the sand are classified by a trommel 9 with the gravel remaining therein. In this way the trommel 9 is prevented from being clogged.

Description

[Detailed Description of the Invention] Industrial Application Field This invention is applicable to the use of a concrete mixer truck after discharging a predetermined amount of fresh concrete during use, the so-called returned fresh concrete remaining therein, and after cleaning the mixer truck. The invention relates to a device for recovering aggregates such as sand and gravel from wastewater (both of which are collectively referred to as sludge).

2. Description of the Related Art A conventional aggregate recovery device of this type has a horizontal rotating drum that is partitioned into a donut-shaped partition plate to sequentially form a hot water washing tank, an overflow transfer tank, and a trommel tank from the upstream side. The drum is rotated at a constant speed, and the sludge is poured into the bottom of the hot water washing tank for mixed washing, then once scraped up from the bottom to the top, and then fed into the trommel in the trommel tank. Here, fresh water is replenished and while cleaning, the gravel and sand are separated and collected, and this decontaminated water is sent to the overflow transfer tank by overflowing the partition plate, and this is sent in a packet to section -E. The sludge is scraped up and returned to the hot water washing tank, where it is used to wash the newly introduced sludge.

Therefore, this recovery device is extremely convenient because once the sludge is input, the gravel and sand can be automatically separated and taken out.

However, as mentioned above, the rotational speed of the rotating drum is constant regardless of the amount of sludge supplied into the rotating drum, so there is a limit to the amount of sludge that can be processed. If the amount of sludge processed cannot be increased and the amount of sludge input is too small, the rotation speed will be too high for that star, and the sand will be stirred too much and cannot be separated, reducing the sand recovery rate. I will do it.

Furthermore, it is not possible to prevent the clogging of the trommel, and when cleaning the trommel, it is necessary to stop collecting one trommel and crawl inside the trommel, which increases the difficulty and effort. This also causes a waste of time.

Problems to be Solved by the Present Invention The purpose of the present invention is to reduce the reduction in sludge processing capacity caused by the rotational speed of the rotating drum of the conventional recovery device always being constant regardless of changes in the amount of sludge input;
and to prevent a decline in the sand recovery rate.

Another purpose is to prevent clogging of the trommel and to enable its cleaning work to be carried out easily and in a short time.

Means for Solving the Problems The present invention provides an aggregate recovery device in which the inside of a horizontal rotating drum is partitioned by donut-shaped partition plates, and a hot water washing tank, an overflow transfer tank, and a trommel tank are formed in sequence from the upstream side. The total weight scale of the rotary drum and the transmission of the rotary drum are interlockably connected, and a trommel is provided concentrically and rotatably in the trommel tank, and upper and lower end edges of the trommel are provided. The trommel tub is formed such that it can be slightly angularly displaced relative to its axis, and the driving claws at both the upper and lower end edges of the trommel tank and the driven claws at both the upstream and downstream end edges of the trommel are removably provided. The width in the rotational direction of at least one of the driving pawl and the driven pawl that engage with each other at both the downstream end edges is made different from each other at both the upstream and downstream end edges, and an inspection window is provided on the rotary driver located outside the trommel. and a door.

Function: When recovering aggregate using the aggregate recovery device of the present invention, the rotating drum is rotated at a constant speed in advance, and the sludge is introduced into the bottom of the hot water washing tank on the upstream side near the inlet. After moving this to the downstream side while mixing it with a screw conveyor installed on the inner wall of the hot water washing tank, the gravel and sand in it are removed by scraping blades installed on the inner wall.
The water is once scraped up from the bottom to the top and then supplied onto the screw conveyor inside the trommel tank, where fresh water is replenished and while cleaning, the gravel and sand are separated and collected, and the remaining water is removed. Water overflows from the trommel tank and is sent to the overflow transfer tank, where it is scraped up to the top with a bucket installed on the inner wall of the rotating drum and returned to the reheating tank, where it is used to wash the newly introduced sludge. It is something.

During this period, the total weight of the rotating drum and the sludge supplied therein is constantly and continuously measured using a scale, and the output signal is input to the rotating drum's transmission to change the rotational speed of the rotating drum at that time. The speed is automatically controlled to suit the weight of the sludge.

In addition, when the suspension time is long, such as at night, the trommel is rotated intermittently (1 to 2 minutes for every 1 hour suspension) to prevent cement that is not suitable for rotary drums from settling and solidifying. Twist alternately in the axial direction to give a slight angular displacement to deform the 1 to Rommel mesh, and allow the aggregates clogging the mesh to fall out. If the clogging gradually increases after a certain period of operation, workers use the suspension time to remove it from outside the inspection window.

Embodiment An embodiment of the present invention will be described with reference to the accompanying drawings. The inside of a horizontal rotating drum 1 supported by rollers 2 is partitioned by doughnut-shaped partition plates 3, 3, and the sludge 15 is transferred to the input gutter 15.
In an aggregate recovery device that sequentially forms a hot water washing tank 4, an overflow transfer tank 5, and a trommel tank 6 from the two-liquid side when supplying from "a", a charging needle 7 and a sludge charging needle 7 for charging sludge into the rotating drum 1 are used. , the motive force I that drives the rotating tram 1! 8a
and the transmission 8b are mutually coupled via an interlocking means 8C,
Further, in the Rommel tank 6, 1 to Rommel 9 are concentrically and rotatably installed with their support rings 10a and 10b.
'::l' Part 1 - Both upper and lower end edges 9a of Rommel 9,
9b is formed to allow a slight torsional angle change θ with respect to the axis 9C, and drive claws ILa, 11b of both upper and lower end edges 6a, 6b of the trommel tank 6, and both upper and lower end edges 9a of the trommel 9. .
The center angles αa, αb, βa, βb of at least one of the driven claws 1a, llb and the driven claws 12a, +2b are made different from each other at both the upper and lower end edges. For example, in Figures 8 to 10, the central angle αa is made larger than the central angle αb, and the central angle βa
and the central angle βb are approximately equal, or alternatively, the central angles αa and αb are equal and the central angle βa is larger than βb, or the central angles αa and αb and the central angles βa and β are
It is also possible for both b to be different from each other. Furthermore, an inspection window 13 is provided on the rotating tram 1 located outside the trommel 9.
When collecting aggregate using this aggregate recovery device, the rotary drum 1 is rotated at a constant rotational speed in advance, and the door 14 is installed at the bottom of the mixed washing jIII 4. After the sludge 15 is charged and washed with hot water by a screw conveyor 16 provided on the inner wall of the washing tank 4, an aggregate made of gravel 17, sand 18, etc. therein is placed on the inner wall. The scraping blade 19 is used to scrape the water from the bottom to the upper part, and with its opening 19a facing downward, it falls onto the upper side 20a of the pyramidal guide tube 20, which is installed concentrically at the shaft center. The upper surface 20a of the guide tube 20
, and is supplied into the 1 to Rommel 9 along the inner surface of the pyramidal hopper 21 provided at the upstream edge 6a of the 1 to Rommel 9, and fresh water 23 is replenished from the water supply pipe 22 here. While cleaning, the sand utilization screw conveyor 24 formed on the inner wall of Rommel 9 is transferred from the upstream end edge 6a toward the downstream end edge 6b, and during this time,
Gravel and sand are separated from each other in the trommel 9, the gravel is left in the +- rommel 9, and the sand is taken out to the outside of the trommel 9, and the gravel I7 is used to scrape up the gravel formed on the downstream part of the inner surface of the trommel 9. Scrape with feather 25 and use sand shoe 1
It is discharged to the inlet 26a at the upper end of the tank 26 and collected from the outlet 26b. Also 1~Sand 1 placed outside of Rommel 9
8 is transferred to the downstream edge by the Sunagawa screw conveyor 27 disposed on the inner surface of the rotating drum 1, where it is scraped up by the Sunagawa scraping blades 28, and supplied to the inlet 30a of the Sunagawa chute 30, and the outlet thereof. 30b.

Further, the water 23 supplied into the trommel 9 from the water supply pipe 22 and used for washing gravel and sand overflows the inner edge 3a of the donut-shaped partition plate 3 and flows from the trommel tank 6 into the overflow transfer tank 5. As shown in FIGS. 3 and 5, this is pumped up to the upper part by a packet 31 provided on the inner wall of the rotating drum 1, and dropped through a communication pipe 32 at the bottom of the packet 31, and then the pyramid-shaped The water is returned to the mixed washing tank 4 along the inner surface of the guide tube 20 as indicated by the arrow A20, and is reused for washing the newly introduced sludge.

During this period, the input amount of the rotary drum 1 and the sludge 15 input therein is constantly and continuously measured by a input amount meter 7 such as a weighing scale, and the output signal is sent to the interlocking means 8c to change the speed of the rotary drum 1. Input to device 8b and rotate drum 1
The rotation speed of the sludge is automatically controlled to a speed suitable for the input amount of sludge at that time, and when the input amount is large, the rotation speed is increased to improve the processing capacity of this device, and when the input amount is small, the rotation speed is increased. This reduces the speed and makes it easier to recover the sand in the Rommel tank 6.

Also, when the rotating drum 1 rotates, the rotating drum 1
The diene belt 33 and sprocket 1 ~ boiler 34
Since the rotation direction is intermittently repeated in the forward and reverse directions by the prime mover 8a, which can be rotated forward and backward through the A trommel 9 is rotatably provided concentrically with a drive claw 11a having a center angle βa and a drive claw 11b having a center angle βb with respect to the axis 9c, which protrude from the inner surface of the upstream and downstream end edges of 6, respectively. Upstream and downstream end edges 9a
, 9b, the driven pawl 12a having a width center angle αa and the driven pawl 12b having a width f engage with each other to transmit the rotation of the rotary drum 1 to the rotation of the trommel 9.

When the rotation in the direction of arrow A1 begins to rotate in the opposite direction, that is, in the direction of arrow B, the engagement between each drive pawl is disengaged, and the trommel 9 is rotated by the support ring 10a, due to the resistance based on gravity, etc.
When the rotating drum 1 stops rotating while being supported by the rotating drum 10b, the upstream drive claw 11a has a center angle θ-(αa+βb)-(αb+βb) in the direction of arrow B than the downstream drive claw 11b. ), the drive claw 11a on the upstream side in FIG. When it hits the driven claw 12a, as shown in FIG. 10, the downstream driving claw 11b
is also rotated by (360-.theta.) degrees in the same manner as described above, but is located a central angle .theta. in front of the driven claw I2b on the downstream side.

When the driven pawl 12a is rotated in the direction of arrow B by the driving pawl 11c in this state, only the upstream edge 9a of the trommel 9 is rotated and the downstream edge 9b is stopped, so the trommel 9 is rotated in other directions. Eventually, the driving pawl lid of the downstream end edge 9b hits the driven pawl 12b, and the trommel 9 continues to rotate in the direction of arrow E17B with the trommel 9 being twisted by an angle θ. Twist alternately each time you change the rotation direction with respect to the axial direction,
The shape of the plain weave mesh of the trommel 9 is changed, for example, from a rectangle to a diamond shape or vice versa, and the gravel clogging the mesh is removed. At this time, if the trommel cannot be removed and remains, the rotation of the rotating drum is temporarily stopped, the door 14 of the inspection window 13 is opened, and the operator inserts his/her hand from outside and rotates the trommel in the opposite direction. It is something to be removed while doing so.

Effects Although the present invention has been explained with reference to the embodiments shown in the accompanying drawings, the present invention is not limited to these embodiments, and can be implemented with partial changes and additions within the scope of the gist of the present invention. It is. For example, the transmission of the prime mover may use an inverter or a mechanical transmission.

This invention is an aggregate recovery device in which the inside of a horizontal rotating drum is partitioned with donut-shaped partition plates, and a mixed washing tank, an overflow transfer tank, a tron tank, and a mel tank are sequentially formed from the upstream side of the rotating drum. A sludge input amount meter,
Since the transmission of the rotating drum is linked to the transmission of the rotating drum, the amount of sludge fed into the rotating drum can be continuously measured with the input amount meter, and the output signal can be used to change the speed of the rotating drum. The rotational speed of the rotating drum can be automatically controlled by inputting it into the device to the speed most suitable for the amount of sludge being put into the rotating drum at that time, and the rotational speed of the rotating tram of the conventional recovery device can be controlled automatically. , it is possible to prevent a decrease in aggregate recovery processing capacity and a decrease in sand recovery rate that would otherwise occur due to the slurry being kept constant regardless of changes in the amount of slurry input.

In addition, the present invention provides a trommel that is concentrically and rotatably provided in the trommel tank, the trommel is formed so as to be able to change the torsional angle slightly with respect to the axis, and drive claws at both upstream and downstream end edges of the trommel tank, The driven pawls at both the upper and lower end edges of the trommel are removably provided, and the center angle with respect to the axis of at least one of the driving pawl and the driven pawl located at both the upstream and downstream ends is set at both the upstream and downstream end edges. They are made to be different from each other, and the rotating drum is intermittently rotated in reverse, so each time the rotation direction changes, the + and - rommels are slightly twisted with respect to the axis, and the mesh is deformed and clogged. Gravel can fall out from there and prevent clogging of the trommel.

Furthermore, since an inspection window and a door are installed on the rotating drum located outside the trommel, gravel or other foreign matter that does not fall off even when the trommel is rotated intermittently in the opposite direction can be removed from the rotating drum. An operator can insert his arm into it from the outside and easily remove it.

[Brief explanation of drawings]

The accompanying drawings show an embodiment of the present invention; FIG. 1 is a front view thereof, FIG. 2 is a side view thereof, FIG. 3 is an enlarged sectional view of a portion of FIG. 5 is a sectional view of the line V-V in FIG. 3, FIG. 6 is a sectional view of the vr-VI line in FIG. 8 is an enlarged view of a portion of FIG. 3, FIG. 9 is a sectional view of the section taken along line IX-IX in FIG. 8, and FIG. 10 is a sectional view taken along line XX in FIG. It is a sectional view of a line part. 1... Rotating drum 3... Partition plate 4... Mixed wash tank 5... Overflow transfer tank 6... Trommel tank 6a... Upstream end edge of trommel tank 6b... Trommel tank Downstream edge 7...Input meter 8a...Motor 8b...High speed machine 9...Trommel 9c...Axis θ...Torsional angular displacement 9a...I-Upstream edge of rommel Part 9b...Downstream end edge 11a of the trommel...Drive claw 11b...Drive claw 12a...Driven claw 12b...Driven claw αa...Center angle αb of the driven claw at the upstream end edge・・・
・Central angle βa of the driven pawl at the downstream edge...Central angle βb of the drive pawl at the upstream edge...Central angle 13 of the drive pawl at the downstream edge...Inspection window 14・・・・・・・Inspection window door

Claims (1)

[Claims] 1. In an aggregate recovery device in which the inside of a horizontal rotating drum is partitioned by donut-shaped partition plates, and a mixed washing tank, an overflow transfer tank, and a trommel tank are sequentially formed from the upstream side, the rotating A meter for the amount of sludge fed into the drum and a transmission for the driving motor of the rotating drum are linked together,
Further, a trommel is provided concentrically and rotatably within the trommel tank, and the trommel is formed so as to be able to rotate slightly with respect to the axis. The driven pawls at both the upstream and downstream edges are removably provided, and the central angles of the driving pawl and the driven pawl located at both the upstream and downstream edges with respect to the axis of at least one are made to differ from each other at both the upstream and downstream edges. An aggregate recovery device further comprising an inspection window and a door provided on the rotating drum located outside the trommel. 2. The aggregate recovery device according to claim 1, wherein the transmission of the driving motor is an inverter. 3. The aggregate recovery apparatus according to claim 1, wherein the input amount meter is a total weight meter of the rotating drum and the weight of the sludge charged into the drum. 4. The aggregate recovery device according to claim 1, wherein the input amount meter is a sludge concentration meter provided in the sludge input gutter. 5. The central angles of the drive claws formed at both the upper and lower end edges of the trommel tank with respect to the axis are equal to each other, and the center angles of the driven claws formed at both the upper and lower end edges of the trommel with respect to the axis are equal to each other. Claim 1 characterized by making a difference
Aggregate recovery equipment as described. 6. The center angles of the widths of the drive claws formed at both the upper and lower end edges of the trommel tub with respect to the axis are different from each other, and the center angles of the driven claws formed at both the upper and lower end edges of the trommel with respect to the axis 2. The aggregate recovery device according to claim 1, wherein: are made equal to each other.