JP2651559B2 - Waste water treatment equipment for water jet processing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste liquid processing apparatus for a water jet processing apparatus, and more particularly to a nozzle for a solid-liquid mixed fluid obtained by dispersing and mixing solid particles (abrasive) as abrasives in a liquid (water) pressurized to a high pressure. The present invention relates to a waste water treatment apparatus of an abrasive water jet processing apparatus that performs processing such as cutting of an object by injecting the object from an object.

[0002]

2. Description of the Related Art Water jet processing techniques for performing processing such as cutting of an object using a water jet jetted at a high pressure from a nozzle include those using only a water jet and those using the water jet mixed with the abrasive. Some are used. The abrasive uses particles of high hardness, such as garnet, alumina, and cast iron.

When processing such as cutting of an object is performed by an abrasive water jet, used abrasives, chips of the object, and waste liquid are generated. Abrasive mixed with waste liquid behaves like desert sand. That is, if the waste liquid is stirred, it flies in the liquid, and except for the waste liquid, it hardens and does not flow. On the other hand, the waste liquid is polluted water (contamination degree 400). The waste liquid contains fine particles of the abrasive and fine chips of the object to be cut. If this waste liquid is left for a certain period of time, relatively heavy particles settle, but fine particles have a very slow settling speed, so that changes in turbidity and the like are slow, greatly exceeding the drainage standard.

When processing such as cutting is performed with an abrasive water jet, abrasive and waste liquid accumulate in a water receiving tank receiving the jet. To remove this, it is necessary for an operator to enter the water receiving tank and scrape the abrasive out of the water receiving tank. In cutting with an abrasive water jet, for example, 25 kg of abrasive is used per hour, and 120 liters of waste liquid is discharged. If used in this state for 8 hours a day, 200 kg of abrasive and 960 liters of waste liquid would have to be treated. Therefore, in order to treat such a large amount of abrasives and waste liquids, a device for transporting the abrasive and filtering the waste liquids is required.

[0005] For the abrasive water jet, for example, an abrasive having a specific gravity of 4 and a hardness of about 10 is used. Regarding the abrasive transfer, for example,
A centrifugal pump, such as a slurry pump or a sand pump, is often used as disclosed in Japanese Patent Publication No. 3 (JP-A) No. However, the abrasive used in the abrasive water jet has a higher specific gravity, a higher hardness, and a higher concentration than sand and gravel as described above, and thus causes problems in terms of pump damage and life. That is, the abrasive having high hardness wears the impeller and the seal portion of the pump rotating at high speed.

[0006] As a waste liquid filtration device for a water jet, there is provided a filtration water tank provided at a position where the waste liquid flows naturally from a water jet receiving tank, and a bucket type primary filter is arranged in the filtration water tank. is there. The waste liquid enters the filtration tank through the primary filter, where coarse particles (30 μm or more) in the waste liquid are removed and remain in the primary filter. When the amount of waste liquid entering the filtration tank reaches a certain level or higher, the sensor is activated, the pump starts,
The waste liquid in the filtration water tank is sucked up by a pump, enters a secondary filter, is filtered by a 0.5 μm filter, and is discharged.

In the above-mentioned water jet waste liquid filtering apparatus, it is necessary to manually pull up and collect the primary filter from the inside of the filtration water tank. In addition, the secondary filter is a disposable consumable, which is disadvantageous in terms of cost and environment (producing secondary waste for waste liquid treatment).

[0008]

In the state of the art described above, there are the following problems to be solved. (1) The abrasive stored in the water jet receiving tank can be easily and manually transferred. (2) When transferring abrasives stored in the water receiving tank,
Able to transfer without interrupting the use of abrasive water jets. (3) Able to collect water by removing (dehydrating) water from the transferred abrasive. (4) The waste liquid is polluted, for example, with a turbidity of 400, so that the water quality can be improved before being discharged. (5) Therefore, the waste liquid can be freely transferred. (6) The transfer means must be resistant to abrasive wear and breakage. (7) Waste liquid treatment can be performed without producing secondary waste.

The present invention has been made in view of the above points, and has as its object to provide a waste liquid processing apparatus for a water jet processing apparatus which can solve the above problems.

[0010]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a water for processing an object by jetting a solid-liquid mixed fluid in which solid particles are dispersed and mixed into a liquid pressurized to a high pressure from a nozzle. FIG. 3 shows a waste liquid treatment apparatus for a jet processing apparatus, which includes a water receiving tank 5 for receiving a solid-liquid mixed fluid from a nozzle 22, and a solid-liquid mixed fluid or a solid material contained in the water receiving tank 5. Aspirating liquid containing water and receiving water 5
A first ejector 8 to be transported to the outside, a separator 12 for containing a liquid transported by the first ejector 8 to lift up and separate solid matter including solid particles deposited at a lower portion, and the separator 12 And a small tank 17 for storing a liquid containing solid particles or solids that are not separated by the above method.

As shown in FIG. 3, a liquid containing solid particles and solids precipitated in a small tank 17 and settled at the bottom is sucked into the waste liquid processing apparatus of the water jet processing apparatus. A second ejector 18 for transferring;
First, a liquid containing a solid that has overflowed in the small tank 17 is stored and a solid containing solid particles is precipitated.
And a centrifugal pump 2 for sucking the supernatant liquid of the first sedimentation tank 1 and sending it to the water receiving tank 5 and the small tank 17, and the liquid sent to the water receiving tank 5 is supplied to the water receiving tank 5. Sprinkling water 23 in the inside 5 to wash out solid particles and solid matter attached to the wall surface and bottom surface, and also to the first ejector 8 to suck the liquid containing solid particles and solid matter and send it to the separator 12, and to the small tank, The sent liquid is characterized in that the second ejector 18 sucks the liquid containing the solid particles and solids settled to the bottom by the second ejector 18 and sends the liquid to the separator 12.

Further, the waste liquid treatment device of the above-mentioned water jet processing device has a second settling liquid containing the supernatant of the first settling tank.
Is provided, and the particles in the waste liquid are precipitated and / or condensed in the second sedimentation tank 20, and the supernatant liquid of the second sedimentation tank 20 is filtered by the filtration apparatus 21. And improve water quality and discharge.

[0013]

According to the above construction, the water receiving tank 5 is provided.
The solid-liquid mixed fluid and the liquid containing solid matter contained in the liquid are sucked by the first ejector 8 and transferred to the separator 12. In the separator 12, abrasives and solids are lifted and separated, and a liquid containing a solid that is not separated by the lift separation flows into the small tank 17. The solid-liquid mixed fluid overflowing in the small tank 17 flows into the first sedimentation tank 1, where solids containing abrasives are precipitated, and solids containing minute and trace amounts of abrasives are contained in the supernatant of the sedimentation tank 1. Only included. The supernatant liquid of the sedimentation tank 1 is sucked up by the centrifugal pump 2 and the water receiving tank 5 and the small tank 1
7

A part of the supernatant liquid sent into the water receiving tank 5 is sprinkled to wash away solids including abrasives attached to the wall surface, and the other part is sent to the first ejector 8 to be subjected to the first ejector 8. Is ejected together with the solid containing abrasive and sent to the separator 12. Further, the supernatant liquid sent into the small tank 17 is sent to a second ejector 18 provided in the small tank 17 and the second ejector 18
Is sucked together with the solid containing abrasive that has settled to the bottom at the bottom, and sent to the separator 12.

FIG. 5 is a diagram showing the distribution of abrasive particle sizes contained in the waste liquid. In the figure, the horizontal axis represents the size (particle size) of the abrasive grains contained in the waste liquid, and the vertical axis represents the weight of the abrasive contained in the waste liquid. In the same figure, a curve A shows the particle size distribution of abrasive contained in the waste liquid, and a curve N1 shows the first ejector 8 and the separator 12
Shows the particle size distribution state of the abrasive collected by a single scraping, and curves N2 to N5 form an abrasive collection cycle by using the first settling tank 1, the centrifugal pump 2 and the second ejector 18, respectively. , Separator 12
3 shows the distribution of the particle size of the abrasive collected by two to five scrapings.

As shown in the curve A, the abrasive particle size distribution contained in the waste liquid includes small to large particles. As shown by the curve N1, a certain amount of abrasive can be recovered by the recovery by the first ejector 8 and the separator 12, but the abrasive recovery cycle is performed using the first settling tank 1, the centrifugal pump 2 and the second ejector 18. By forming, by increasing the number of times of scraping by the separator 12 as shown by the curves N2 to N5,
The abrasive having a predetermined particle size M or more can be almost completely recovered. However, abrasives having a particle size equal to or less than the predetermined value M can hardly be recovered.

Therefore, the abrasive having the predetermined particle size M or less is settled in the first settling tank 1, or the supernatant of the first settling tank 1 is stored in the second settling tank 20, and the waste liquid is Is removed from the waste liquid by precipitation and / or condensation, and the supernatant of the second settling tank 20 is filtered by a filtration device 21 to improve and discharge the water quality.

The supernatant of the first sedimentation tank 1 is sucked up by the centrifugal pump 2 and sent to the water receiving tank 5 or the small tank 17, but the supernatant contains only very small solid matter containing a small amount of abrasive. Therefore, damage to the centrifugal pump 2 can be reduced.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a view showing a configuration of a waste liquid processing apparatus of a water jet processing apparatus according to the second and third aspects of the present invention.
Is an external view as viewed from obliquely above.

The waste liquid treatment apparatus includes a water receiving tank 5 for receiving a solid-liquid mixed fluid of abrasive and water from a nozzle 22, a first ejector 8 provided in the water receiving tank 5,
A separator 12 for holding the liquid sucked and transferred by the ejector 8 and agitating and separating solids including abrasives deposited at a lower portion thereof, and a separator 12 for storing liquid containing solid particles and solids not separated by the separator 12. The tank 17 and the small tank 1
7, a first settling tank 1 for containing the liquid overflowing in the small tank 17 to settle solids including abrasives, and a supernatant overflowing in the first settling tank 1. A second sedimentation tank 20 containing a liquid.

The supernatant of the first settling tank 1 is supplied to a centrifugal pump 2
Thereby, the water is sent to the water receiving tank 5 and the small tank 17 through the pipes 3 and 4. The pipe 3 branches into a pipe 6 and a pipe 7 in the water receiving tank 5. A hole for generating water spray 23 is formed at the tip of the pipe 7, and the tip of the pipe 6 is the first
Is connected to the ejector 8. First ejector 8
Is connected to the separator 12. As shown in the figure, the bottom plate 9 of the water receiving tank 5 is inclined at an angle of about 10 degrees so that solids including abrasives can easily flow down.
Is generated, solids such as abrasives on the bottom plate 9 and swarf of an object to be processed and waste liquid are washed away.

A groove 10 is formed below the bottom plate 9, and the ejector 8 is arranged in the groove 10. The abrasives, solids and waste liquids washed away by the water spray 23 at the tip of the pipe 7 and the water of the water spray 23 flow into the groove 10,
It is sucked by the ejector 8 and sent to the separator 12 through the pipe.

The separator 12 is provided inside the container 13 to lift up abrasives and solids deposited on the bottom of the container 13.
4 are accommodated. The lifting mechanism 14 is a conveyor 14
a is provided on the upper surface of the conveyor 14a, and projections 14b are provided on the upper surface of the conveyor 14a at equal intervals in the width direction.
Is rotated to scrape up abrasives and solids that have accumulated inside the container 13, so that the abrasives and solids are thrown into the unloading container 16 disposed directly below the discharge port 15 provided on the lower surface of the container 13. Has become. The waste liquid containing abrasives and solids sucked by the first ejector 8 and flowing into the container 13 of the separator 12 is deposited and deposited on the bottom of the abrasives and solids in the container 13.

The abrasives and solids deposited on the bottom of the container 13 are removed from the projections 14 for lifting up the conveyor 14a.
The water contained in the abrasives and solids is dehydrated with this transfer, and is discharged from the outlet 15 as described above.

A small tank 17 is provided adjacent to the container 13 of the separator 12.
Abrasives and solids not spilled up by the gap of 4a from the opening 14a are removed from the small tank 1 together with the waste liquid through the opening 14c.
7 and the abrasives and solids settle. The tip of the pipe 4 is connected to a second ejector 18 provided in the small tank 17. The abrasives and solids flowing into the small tank 17 are sucked by the second ejector 18 and returned to the container 13 of the separator 12. Abrasives and solids settled and deposited on the bottom of the container 13 are scraped again by the conveyor 14a of the scraping mechanism 14 and discharged.
Thereby, the separation efficiency of the separator 12 is improved.
Therefore, waste liquid overflowing from the small tank 17 does not contain large solids.

The waste liquid overflowing in the small tank 17 passes through a pipe 1a through an opening provided in the upper wall of the first settling tank 1.
The waste liquid overflowing in the first settling tank 1 flows into the second settling tank 20 through an opening provided in the upper wall surface of the second settling tank 20 through a pipe 20a. The waste liquid overflowing in the second sedimentation tank 20 flows into the filtration device 21 through the pipe 24,
The water is filtered by the filtration device 21 and discharged.

The waste liquid overflowed in the small tank 17 as described above flows into the sedimentation tank 1, where solids containing abrasives precipitate, and solids containing minute and trace amounts of abrasives are contained in the supernatant of the sedimentation tank 1. Only included.
The supernatant of the sedimentation tank 1 is sucked up by the centrifugal pump 2,
The centrifugal pump 2 is sent to the water receiving tank 5 and the small tank 17, but the supernatant liquid contains only minute solids containing minute and minute abrasives as described above. Further, the first ejector 8 and the second ejector 1
8 also has little wear.

The first settling tank 1 and the second settling tank 20 are provided with drain valves 25 and 26, respectively. By opening the drain discharge valves 25 and 26, minute solids settled in the first settling tank 1 and the second settling tank 20 can be periodically drained. Although not shown, a neutralizing agent may be added to adjust the water quality in the second settling tank 20, or a coagulant may be added to settle the suspended particles at an early stage.

In the above embodiment, a first settling tank 1 and a centrifugal pump 2 are provided, and the supernatant liquid of the first settling tank 1 is sent to the water receiving tank 5 and the small tank 17 by the centrifugal pump 2 to execute an abrasive recovery cycle. Although the example which forms and further provides the 2nd sedimentation tank 20 and the filtration apparatus 21 was demonstrated, this 1st sedimentation tank 1,
The centrifugal pump 2, the second sedimentation tank 20, and the filtration device 21 are not always necessary, and may be omitted in some cases.

FIG. 3 is a view showing the structure of the waste liquid treatment apparatus of the water jet processing apparatus according to the first embodiment of the present invention.
Is an external view as viewed from obliquely above. This waste liquid treatment apparatus omits the first sedimentation tank 1, the centrifugal pump 2, the second sedimentation tank 20, the second ejector 18, and the filtration device 21 of the waste liquid treatment apparatus shown in FIGS. Water is supplied into the water receiving tank 5 through the pipe 3, and the water is supplied to the first ejector 8 through the pipe 6 and sprinkled through the pipe 7.
It becomes 3.

The abrasives, solids and waste liquid washed out by the water spray 23 are sucked by the first ejector 8 and sent to the separator 12 through the pipe 11. Among the abrasives, solids and waste liquid flowing into the container 13 of the separator 12, the abrasives and solids are deposited on the bottom of the container 13,
It is scraped off by the scraping projection 14 b of the scraping mechanism 14, transported upward, and discharged from the discharge port 15. Abrasives and solids that have spilled out of the gap of the conveyor 14a of the scraping mechanism 14 and have not been scraped up flow into the small tank 17 together with the waste liquid from the opening 14c, and settle. The supernatant is then drained.

This waste liquid treatment apparatus is similar to the waste liquid treatment apparatus shown in FIGS. 1 and 2 except that the first sedimentation tank 1, the centrifugal pump 2, the second sedimentation tank 20, the second ejector 18, and the filtration device 21 are omitted. Therefore, the abrasives and solids are inferior to the waste liquid treatment apparatus shown in FIGS. 1 and 2, but if the abrasives and solids are substances that do not cause environmental pollution, they are further discharged from the small tank 17. When the waste liquid is processed by another processing apparatus, a waste liquid processing apparatus having such a simple configuration may be used.

[0033]

As described above, according to the present invention, the following excellent effects can be obtained. (1) The abrasive accumulated in the water jet receiving tank can be easily transferred without manual operation and without interrupting the use of the abrasive water jet.

(2) Water can be easily removed (dewatered) from the waste liquid by the separator, and the abrasive can be recovered. In addition, since the solids in the waste liquid discharged from the separator are repeatedly charged into the separator, the recovery rate increases.

(3) Since the waste liquid is used as a water source for sprinkling the supernatant liquid and ejector, no new waste liquid is generated.

(4) The pump, which is a means for transferring waste liquid, is configured to suck up the supernatant liquid of the sedimentation tank, and solid particles such as abrasives contained in the supernatant liquid are minute and minute. Wear and breakage of the ejector and the ejector can be reduced.

(5) Waste liquid treatment can be performed without producing secondary waste.

[Brief description of the drawings]

FIG. 1 is a diagram illustrating a configuration example of a waste liquid processing apparatus of a water jet processing apparatus according to the present invention.

FIG. 2 is an external view of the waste liquid processing apparatus of the water jet processing apparatus shown in FIG. 1 as viewed obliquely from above.

FIG. 3 is a diagram showing a configuration example of a waste liquid processing device of the water jet processing device of the present invention.

FIG. 4 is an external view of the waste liquid processing apparatus of the water jet processing apparatus shown in FIG. 3 as viewed obliquely from above.

FIG. 5 is a view showing a distribution state of the particle size of abrasive contained in the waste liquid.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Sedimentation tank 2 Centrifugal pump 3 Pipe 4 Pipe 5 Water receiving tank 6 Pipe 7 Pipe 8 Ejector 9 Bottom plate 10 Groove 11 Pipe 12 Separator 13 Container 14 Scooping mechanism 15 Discharge port 16 Unloading container 17 Small tank 18 Ejector 19 Pipe 20 Settling tank 21 Filtration device 22 Nozzle 23 Watering 24 Pipe 25 Valve 26 Valve

Claims (3)

(57) [Claims] 1. A waste liquid processing apparatus of a water jet processing apparatus for processing a target object by jetting a solid-liquid mixed fluid in which solid particles are dispersed and mixed in a liquid pressurized to a high pressure from a nozzle, wherein: A water receiving tank for receiving the solid-liquid mixed fluid, a first ejector for sucking the solid-liquid mixed fluid or the liquid containing solid matter contained in the water receiving tank and transferring the liquid out of the water receiving tank; A separator that lifts and separates a solid material containing the solid particles deposited on the lower portion and separates the liquid transferred by the ejector, and stores a liquid containing the solid particles and the solid material that are not separated by the separator. A waste liquid treatment device for a water jet processing device, comprising: a small tank. 2. The waste liquid treatment device for a water jet processing device according to claim 1, wherein the liquid containing the solid particles and solids contained in the small tank and settled at the bottom is suctioned and separated. A second ejector to be transferred to an apparatus, a first sedimentation tank for containing a liquid containing the solid matter overflowed in the small tank and sedimenting a solid matter containing the solid particles, A pump that sucks up the supernatant liquid and sends it to the water receiving tank and the small tank, and the liquid sent to the water receiving tank is sprinkled in the water receiving tank,
The solid particles and solids attached to the wall surface and the bottom surface are washed out, and the liquid containing the solid particles and the solids is sent to the first ejector and sucked and sent to the separator, and the liquid sent to the small tank is A waste liquid treatment apparatus for a water jet processing apparatus, wherein the second ejector sucks the liquid containing the solid particles and solids settled at the bottom and sends the liquid to the separator. 3. The waste liquid treatment device for a water jet processing device according to claim 2, further comprising: a second settling tank containing a supernatant of the first settling tank; and a filtering device. Water jet processing wherein the particles in the waste liquid are precipitated and / or condensed in the settling tank of No. 2 and the supernatant of the second settling tank is filtered by the filtration device to improve and discharge the water quality. Equipment waste liquid treatment equipment.