JP2024067295A - Sludge recovery equipment - Google Patents

Abstract

[Problem] To provide a sludge recovery device capable of recovering a wide variety of sludge. [Solution] A sludge recovery device 18 includes a filter device 7 connected to a first nozzle system 31 for sucking submerged sludge 5a and a second nozzle system 32 for sucking sludge 5b at or near the liquid surface, and for filtering the sludge liquid, a pump 9 for sucking the sludge liquid filtered by the filter device 7, and a magnetic separator 12 into which the sludge liquid discharged from the pump 9 is introduced and which returns the separated liquid to a tank 1 by gravity flow. The filter device 7, pump 9, and magnetic separator 12 are mounted on the same portable cart 6. It is possible to switch between a system 11 for returning the sludge liquid discharged from the pump 9 to the tank 1 and a system 10 for feeding the sludge liquid into the magnetic separator 12. [Selected Figure] Figure 1

Description

The present invention relates to a sludge recovery device that can recover and separate sludge mixed with machining fluids, coolant fluids, cleaning fluids, etc. in tanks of processing machines, machine tools, etc. from outside the tanks.

Sludge made from cutting scraps from the workpiece accumulates in the machining fluid circulation tanks of processing machines and in the coolant tanks of machine tools, eventually causing problems such as clogging of the machining fluid or coolant. To collect and remove the sludge, a scraping conveyor is usually installed in the tank, and an in-line filter consisting of a filter or cyclone is installed in the liquid circulation system.

However, the above method alone is not sufficient to recover and remove the sludge, and the sludge gradually settles and accumulates in the tank. For this reason, the tank is periodically vacuumed and the liquid is replaced with new. Naturally, this incurs costs in the form of waste disposal costs for the old liquid and the cost of new liquid.

In addition to sludge, oils such as rust-preventive oils on the surface of the workpiece or lubricating oils from the sliding surfaces of the processing machine body also flow into the tank and float on the liquid surface as floating oil. This floating oil not only causes a foul odor, but also leads to deterioration of the liquid. Although the tank is usually equipped with a floating oil recovery device such as a belt skimmer, recovery is often insufficient, and there are many cases where the liquid needs to be replaced with new one.

In recent years, the need for multi-product production has led to a shift away from centralized coolant systems that group multiple machines together, toward individual coolant management, where each individual machine tool uses a different coolant. For example, Patent Document 1 shows a recovery device that can move to each individual machine tool and recover and remove sludge and floating oil.

Patent Document 1 discloses a sludge recovery device in which sludge liquid containing cemented carbide is poured into a treatment device mounted on a portable cart, and the magnetic sludge is adsorbed onto rod-shaped magnetic adsorbents installed inside the treatment device.

JP 2016-169400 A

However, depending on the type of processing machine or machine tool, a wide variety of sludge may be mixed in the liquid in the tank. Conventional sludge recovery devices have the problem of being unable to recover a wide variety of sludge. In particular, it is difficult to recover fine sludge produced during grinding on a grinding machine, and sludge-like sludge produced during casting processing.

The present invention was made in consideration of the above problems, and its first objective is to provide a sludge recovery device that can recover a wide variety of sludge.

On the other hand, not only sludge but also floating oil often floats on the liquid surface of the tanks of processing machines and machine tools, so there is a demand for sludge recovery equipment that can recover and separate both sludge and floating oil.

The second object of the present invention is to provide a sludge recovery device that can recover both sludge and floating oil.

In order to solve the first problem, the first aspect of the present invention is a sludge recovery device that is equipped with a filter device that filters the sludge liquid and is connected to a first nozzle system that sucks up submerged sludge and a second nozzle system that sucks up sludge at or near the liquid surface, a pump that sucks up the sludge liquid filtered by the filter device, and a magnetic separator into which the sludge liquid discharged from the pump is introduced and which returns the separated liquid to a tank by gravity flow, the filter device, the pump, and the magnetic separator being mounted on the same portable cart, and which is switchable between a system that returns the sludge liquid discharged from the pump to the tank and a system that inputs the sludge liquid to the magnetic separator.

In order to solve the second problem, the second aspect of the present invention is a sludge recovery device that includes a filter device that is connected to a first nozzle system that sucks up submerged sludge and a second nozzle system that sucks up floating oil at or near the liquid surface and that filters the sludge liquid, a pump that sucks up the sludge liquid filtered by the filter device, and an oil-water separation tank into which the sludge liquid discharged from the pump is poured and into which the separated liquid is returned to a tank by gravity flow, the filter device, the pump, and the oil-water separation tank being mounted on the same portable cart, and that can be switched between a system that returns the sludge liquid discharged from the pump to the tank and a system that pours the sludge liquid into the oil-water separation tank.

According to the first aspect of the present invention, the filter device in the front stage collects submerged sludge and surface sludge, and the magnetic separator in the rear stage collects fine sludge that cannot be collected by the filter device, so a wide variety of sludge can be collected. In addition, since it is possible to switch between a system that returns the sludge liquid discharged from the pump to the tank and a system that feeds it into the magnetic separator, the sludge collection device can be operated efficiently depending on the presence or absence of fine sludge. Furthermore, since the sludge collection device is portable, it can be used to clean multiple tanks.

According to the second aspect of the present invention, the submerged sludge and surface sludge are collected by the filter device in the front stage, and the floating oil is collected by the oil-water separation tank in the rear stage, so that both sludge and floating oil can be collected. In addition, since it is possible to switch between a system that returns the sludge liquid discharged from the pump to the tank and a system that feeds it into the oil-water separation tank, the sludge collection device can be operated efficiently depending on the presence or absence of floating oil. Furthermore, since the sludge collection device is portable, it can be used to clean multiple tanks.

1 is a schematic diagram of a sludge recovery device according to a first embodiment of the present invention; FIG. 2(a) is a vertical cross-sectional view of the filter device, and FIG. 2(b) is a perspective view of the filter. FIG. 3(a) is a vertical sectional view of a filter device according to another embodiment, and FIG. 3(b) is a perspective view of an inner filter. FIG. 4 is a schematic diagram of a sludge recovery device according to a second embodiment of the present invention.

Hereinafter, a sludge recovery apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings. However, the sludge recovery apparatus according to the present invention can be embodied in various forms and is not limited to the embodiments described in this specification. The present embodiment is provided with the intention of enabling a person skilled in the art to fully understand the invention by fully disclosing the specification.
First Embodiment

Figure 1 shows a schematic diagram of a sludge recovery device 18 according to a first embodiment of the present invention. In Figure 1, 7 is a filter device, 9 is a pump, and 12 is a magnetic separator. The filter device 7, pump 9, and magnetic separator 12 are mounted on the same portable cart 6.

The portable cart 6 includes a frame 6a, a push handle 6c attached to the frame 6a, and a number of casters 6b attached to the lower part of the frame 6a. The filter device 7, the pump 9, and the magnetic separator 12 are attached to the frame 6a of the portable cart 6.

1 is a tank, 4 is a liquid such as a machining liquid or a coolant liquid, 31 is a first nozzle system, 32 is a second nozzle system, 2 is a submerged sludge suction nozzle of the first nozzle system 31, and 3 is a liquid surface or near-liquid surface sludge suction nozzle of the second nozzle system 32 (hereinafter simply referred to as liquid surface sludge).

The submerged sludge suction nozzle 2 uses the negative suction pressure of the pump 9 to suck up submerged sludge 5a, such as settled sludge at the bottom of the liquid in the tank 1 and submerged sludge floating in the liquid. The sucked submerged sludge 5a flows into the filter device 7 via the first nozzle system 31.

The liquid surface sludge suction nozzle 3 sucks the liquid surface sludge 5b floating in the tank 1 by the suction negative pressure of the pump 9. The sucked liquid surface sludge 5b flows into the filter device 7 via the second nozzle system 32. The liquid surface sludge suction nozzle 3 is equipped with multiple floats 3a and a nozzle body 3b that floats near the liquid surface by the floats 3a so that it can suck the liquid surface sludge 5b in the tank 1.

The first nozzle system 31 is provided with a valve 31a. The second nozzle system 32 is provided with a valve 32a. These valves 31a, 32a make it possible to switch between the first nozzle system 31 and the second nozzle system 32. In other words, it is possible to switch between a state in which only the first nozzle system 31 is connected to the filter device 7, a state in which only the second nozzle system 32 is connected to the filter device 7, and a state in which both the first nozzle system 31 and the second nozzle system 32 are connected to the filter device 7.

As shown in FIG. 2(a), the filter device 7 includes a substantially cylindrical housing 7a with a bottom that is fixed to the frame 6a of the portable dolly 6, a top cover 7b that is detachable from the housing 7a, and a filter 8 that is held in a suspended state within the housing 7a. The filter 8 is held in a suspended state within the housing 7a by resting the ring-shaped outer flange 8a at the upper end of the filter 8 on the ring-shaped inner flange 7a1 of the housing 7a.

A drain outlet 7a2 is provided at the bottom of the housing 7a, opening vertically downward to ensure a smooth liquid flow. The drain outlet 7a2 is connected to the suction side of the pump 9 via a hose or the like. The negative suction pressure of the pump 9 acts on the filter 8, which filters the sludge liquid that has flowed in. As the sludge liquid is filtered, sludge 16 accumulates on the filter 8. 17 is the liquid that accumulates on the top surface of the sludge 16.

As shown in FIG. 2(b), the filter 8 is a substantially cylindrical metal mesh filter with a bottom. The mesh of the upper part 8b2 of the tube part 8b is coarser than the mesh of the lower part 8b1. The tube part 8b may be divided into three stages, upper, middle, and lower, with the mesh becoming coarser toward the top, or the tube part 8b may be divided into four or more stages with the mesh becoming coarser toward the top.

A mesh portion 8c1 through which the sludge liquid can pass is provided in the center of the bottom plate 8c of the filter 8. The entire bottom plate 8c may be made into a mesh portion.

As shown in FIG. 1 again, the pump 9 sucks the sludge liquid filtered by the filter device 7. The pump 9 is an air-driven or electric diaphragm pump, etc.

A system 11 is connected to the discharge side of the pump 9, which returns the sludge liquid discharged from the pump 9 to the tank 1. A system 10 branches off from this system 11, which feeds the sludge liquid into the magnetic separator 12. A valve 11a is provided in the system 11. A valve 10a is provided in the system 10. These valves 11a and 10a allow switching between the system 11, which returns the sludge liquid discharged from the pump 9 to the tank 1, and the system 10, which feeds the sludge liquid into the magnetic separator 12.

The magnetic separator 12 is a rotating drum type magnetic separator that can continuously separate sludge. The magnetic separator 12 supports a rotating drum (magnetic roller) 12b that is driven to rotate by a motor on the tank body 12a, and a rubber roller 12c is supported on top of the rotating drum by pressing it against the magnetic roller 12b so that it can rotate freely. A chute 12d is provided on the outside of the magnetic roller 12b, which slides against the magnetic roller 12b to remove fine sludge 14 that has adhered to the magnetic roller 12b. The fine sludge 14 that falls from the chute 12d is collected in a receiving box 13 attached to the frame 6a.

Inside the tank body 12a, an arc section 12a1 is provided that is spaced at a substantially constant distance from the outer surface of the magnetic roller 12b to match the outer shape of the magnetic roller 12b. The outlet 12a2 on the right side of the arc section 12a1 is separated by a weir 12a3. The clean liquid after separation returns to the tank 1 by gravity flow via the system 15.

Next, the operation of the sludge recovery device 18 will be explained. First, the sludge recovery device 18 is installed next to the tank 1. Then, the submerged sludge suction nozzle 2 and the liquid surface sludge suction nozzle 3 are removed from the sludge recovery device 18, the submerged sludge suction nozzle 2 is inserted into the bottom of the tank 1, and the liquid surface sludge suction nozzle 3 is caused to float to the liquid surface of the tank 1. In addition, the return system 11 from the pump 9 and the return system 15 from the magnetic separator 12 are inserted into the tank 1.

When the pump 9 is started, the negative suction pressure of the pump 9 causes the submerged sludge 5a and the surface sludge 5b to flow into the filter device 7 together with the sludge liquid. The submerged sludge 5a and the surface sludge 5b are filtered by the filter device 7 and accumulate inside the filter 8 as sludge 16.

The sludge liquid filtered by the filter device 7 is poured into the magnetic separator 12 by the pump 9. The sludge liquid poured into the magnetic separator 12 passes between the magnetic roller 12b and the arcuate portion 12a1 of the tank body 12a, passes over the weir 12a3, and reaches the outlet 12a2. Fine sludge 14 mixed in the sludge liquid is adsorbed and collected as it passes under the magnetic roller 12b. Therefore, the liquid that reaches the outlet 12a2 is purified, and this liquid returns to the tank 1 through the system 15 by gravity flow.

The fine sludge 14 attracted and collected by the magnetic roller 12b is squeezed by the rubber roller 12c, removed from the magnetic roller 12b by the chute 12d, and slides down the chute 12d to be deposited inside the receiving box 13 as fine sludge 14.

When removing the sludge 16 that has accumulated in the filter 8, the pump 9 is stopped once and the top lid 7b is removed from the housing 7a. When the pump 9 is then started again, air is sucked in from the open top surface of the filter 8, and the sludge 16 is dehydrated. Instead of removing the top lid 7b from the housing 7a, an air cock may be provided on the top lid 7b and air may be sucked in from the air cock, or the suction nozzles 2, 3 may be lifted and air may be sucked in from the suction nozzles 2, 3. After dehydration, the sludge 16 is removed together with the filter 8 and discharged into a predetermined sludge collection box.

Next, the effects of the sludge recovery device 18 will be explained. The filter device 7 in the front stage recovers submerged sludge 5a and surface sludge 5b, and the magnetic separator 12 in the rear stage recovers fine sludge 14 that cannot be recovered by the filter device 7, so a wide variety of sludge can be recovered. In addition, it is possible to switch between a system 11 that returns the sludge liquid discharged from the pump 9 to the tank 1, and a system 10 that feeds the sludge liquid into the magnetic separator 12, so the sludge recovery device 18 can be operated efficiently depending on the presence or absence of fine sludge 14. Furthermore, because the sludge recovery device 18 is portable, it can clean a large number of tanks 1.

It is possible to switch between the first nozzle system 31, which sucks up the submerged sludge 5a, and the second nozzle system 32, which sucks up the surface sludge 5b, so the sludge recovery device 18 can be operated efficiently depending on the presence or absence of submerged sludge 5a and surface sludge 5b.

Since the mesh of the upper portion 8b2 of the cylindrical portion 8b of the filter 8 is coarser than that of the lower portion 8b1, the liquid 17 accumulated on the upper surface of the sludge 16 can be more efficiently removed, thereby increasing the dewatering efficiency.
(Another Example of a Filter Device)

Figure 3 (a) shows another example of a filter device 41. The configuration of the housing 7a and the top cover 7b of the filter device 41 is the same as the housing 7a and the top cover 7b of the filter device 7 described above, so they are given the same reference numerals and their description is omitted.

The filter 44 in this example includes an inner filter 42 and an outer filter 8. The configuration of the outer filter 8 is the same as that of the filter 8 of the filter device 7 described above, so it is given the same reference numerals and its description is omitted.

As shown in FIG. 3(b), the inner filter 42 is generally cylindrical. The cylindrical portion 42a has a uniform coarse mesh. The bottom of the inner filter 42 has neither a bottom plate nor a mesh. Instead, the bottom of the inner filter 42 is divided by a bar 42b, such as a cross-shaped bar. A handle 42c is provided on the top of the inner filter 42.

The inner filter 42 can be pulled out from the outer filter 8. To make it easier to pull out, a gap g is provided between the cylindrical portion 8b of the outer filter 8 and the cylindrical portion 42a of the inner filter 42.

The filter device 41 in this example is used to improve the dewatering function of sludge. It is particularly effective for sludge-like sludge that has poor drainage properties, such as casting grinding powder.

When sludge liquid is sucked in with the inner filter 42 set in the outer filter 8, sludge and liquid accumulate inside the inner filter 42. In the case of sludge-like sludge, even if the sludge is dehydrated by sucking in air, the liquid remains. At this time, if the top lid 7b is removed and the inner filter 42 is pulled out, the sludge will be loosened and drainage will be improved. The cross-shaped bar 42b at the bottom is particularly effective in loosening the sludge. After the sludge has been loosened, air can be sucked in in the same way to perform a second dehydration, making it possible to dehydrate even sludge-like sludge.
Second Embodiment

Figure 4 shows a schematic diagram of a sludge recovery device 24 according to a second embodiment of the present invention. In Figure 4, 1 is a tank, 2 is a submerged sludge suction nozzle, 3 is a surface sludge suction nozzle, 6 is a portable cart, 7 is a filter device, and 9 is a pump. These components are the same as those of the sludge recovery device 18 according to the first embodiment, so the same reference numerals are used and the description thereof is omitted.

In the second embodiment of the sludge recovery device 24, an oil-water separation tank 20 is installed instead of the magnetic separator 12 to recover both sludge and floating oil.

A system 19 for feeding the sludge liquid into the oil-water separation tank 20 branches off from system 11, which returns the sludge liquid discharged from pump 9 to tank 1. System 19 is provided with a valve 19a. Valves 11a and 19a make it possible to switch between system 11, which returns the sludge liquid discharged from pump 9 to tank 1, and system 19, which feeds the sludge liquid into the oil-water separation tank 20.

The oil-water separation tank 20 separates oil and water into upper and lower parts by utilizing the difference in specific gravity between the oil and water. The sludge liquid discharged from the pump 9 is poured into the liquid storage section 20a of the oil-water separation tank 20. In the liquid storage section 20a, the difference in specific gravity causes the oil to separate over time, with the oil on top and the clean liquid on the bottom. The oil that floats up to the liquid storage section 20a passes over the weir 20b and is collected in the oil recovery section 20c, where it accumulates in the oil receiving basin 21 attached to the frame 6a of the portable cart 6. The clean liquid from which the oil has been separated flows from the liquid storage section 20a to the water recovery section 20d, and returns to the tank 1 by gravity flow via the system 23.

The effect of the sludge recovery device 24 will be explained. Submerged sludge 5a and surface sludge 5b are recovered by the filter device 7 in the front stage, and floating oil 5c is recovered by the oil-water separation tank 20 in the rear stage, so both sludge and floating oil can be recovered. In addition, it is possible to switch between a system 11 that returns the sludge liquid discharged from the pump 9 to the tank 1 and a system 19 that feeds the sludge liquid into the oil-water separation tank 20, so the sludge recovery device 24 can be operated efficiently depending on whether floating oil is present. Furthermore, since the sludge recovery device 24 is portable, multiple tanks 1 can be cleaned.

It is possible to switch between the first nozzle system 31, which sucks up the submerged sludge 5a, and the second nozzle system 32, which sucks up the surface sludge 5b and floating oil 5c, so the sludge recovery device 24 can be operated efficiently depending on the presence or absence of submerged sludge 5a, surface sludge 5b, and floating oil 5c.

1...Tank 2...Submerged sludge suction nozzle 3...Liquid surface sludge suction nozzle 6...Portable cart 7...Filter device 8...Filter, outer filter 8b...Cylinder section of filter 8b1...Lower section 8b2...Upper section 9...Pump 10...System for feeding sludge liquid into magnetic separator 11...System for returning sludge liquid to tank 12...Magnetic separator 18...Sludge recovery device 19...System for feeding sludge liquid into oil-water separation tank 20...Oil-water separation tank 24...Sludge recovery device 31...First nozzle system 32...Second nozzle system 41...Filter device 42...Inner filter 42a...Cylinder section 44...Filter

Claims (5)

a filter device connected to a first nozzle system for sucking sludge in the liquid and a second nozzle system for sucking sludge at or near the liquid surface, the filter device filtering the sludge liquid;
a pump for sucking the sludge liquid filtered by the filter device;
a magnetic separator into which the sludge liquid discharged from the pump is introduced and which returns the separated liquid to the tank by gravity flow;
The filter device, the pump, and the magnetic separator are mounted on a single portable cart;
The sludge recovery device is switchable between a system for returning the sludge liquid discharged from the pump to a tank and a system for introducing the sludge liquid into the magnetic separator. a filter device connected to a first nozzle system for sucking sludge in the liquid and a second nozzle system for sucking floating oil on or near the liquid surface, the filter device filtering the sludge liquid;
a pump for sucking the sludge liquid filtered by the filter device;
an oil-water separation tank into which the sludge liquid discharged from the pump is introduced and into which the separated liquid is returned to a tank by gravity flow;
The filter device, the pump, and the oil-water separation tank are mounted on the same portable cart,
A sludge recovery device that can switch between a system that returns the sludge liquid discharged from the pump to a tank and a system that feeds the sludge liquid into the oil-water separation tank. The sludge recovery device according to claim 1 or 2, characterized in that the first nozzle system and the second nozzle system can be switched. The filter device includes a filter having a cylindrical portion,
3. A sludge recovery apparatus according to claim 1, wherein the mesh of the upper part of the cylindrical portion is coarser than the mesh of the lower part of the cylindrical portion. The filter device includes an inner filter and an outer filter.
A gap is provided between the cylindrical portion of the inner filter and the cylindrical portion of the outer filter,
3. The sludge recovery device according to claim 1, wherein the inner filter is removable from the outer filter.

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