JPH0639724A - Abrasive recovery device in abrasive water jet work - Google Patents

Abstract

PURPOSE:To improve utilization efficiency with an abrasive recycled, by collecting a mixture of a used abrasive and water, sorting an abrasive grain having a grain diameter of a given value or more, dewatering the abrasive grain then drying it to house a dried grain in a hopper. CONSTITUTION:Mixed water including a used abrasive is collected in a sump tank 2, and is stirred with a stirring pump 3 to be sent to a distribution tank 7 with a delivery pump 6. After that, the particulate part having a grain diameter less than 100mum is removed with primary and secondary cyclone separators 8 and 9, then is sent to an enriching tank 10 to be enriched for next dewatering in a centrifugal extractor 11. A dewatered cake of this coarse powder part is sent to a rotary drier 14 via a cake conveyer 12 and a cake hopper 13 to be dried. This dried coarse powder is recovered in a hopper 1 with a flow conveyer 15. The filtrate of the centrifugal extractor 11, together with the ash content of a Rotoclone 17 for processing an exhaust gas in the rotary drier 14, is sent to a thickener 18 to be coagulant-processed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an abrasive material collecting device in an abrasive water jet process in which an abrasive material is sprayed onto a material surface by a water jet.

[0002]

2. Description of the Related Art Compared with other processing methods, this abrasive water jet processing is a high energy beam processing that does not use heat, so it does not cause thermal influence or processing distortion on the cut surface, and does not generate dust during cutting. , No toxic gas is generated,
There is an advantage that the force applied to the cut surface is small and the cut end does not collapse even when cutting a thin plate.

[0003]

Although this abrasive water jet processing has enabled high-speed processing, it is possible to grind a large amount of silica sand, garnet, alumina, cast iron grid, non-spherical and asymmetrical grinding such as iron particles. Although the material breaks into powder or has its corners fall due to collision during use, many of them have shapes and grain sizes that can be reused as abrasives for abrasive water jet processing even after use. Efficient recycling of abrasives has become an important issue to solve.

An object of the present invention is to provide a circulation system for recovering reusable abrasives having a particle size of 100 μm or more in the abrasive water jet processing.

[0005]

An abrasive material recovery apparatus for abrasive water jet machining according to the present invention includes a collecting tank for collecting and agitating a mixed water of used abrasive material and jet water from a processing apparatus, and Separation device for eliminating fine particles having a particle size of less than 100 μm in the mixed water in the collecting tank, and particle size 100 μm recovered in the separation device
It has a device for dehydrating the above particles, a drying device for drying the dehydrated particle cake, and a hopper for storing the dried particles obtained by the drying device.

[0006]

According to the present invention, the abrasive which is continuously discharged into the treated water together with the grinding dust by the abrasive water jet machining can be continuously collected by the relatively compact equipment without using a particularly expensive device. Become.

[0007]

EXAMPLE An example in which the present invention is applied to a recovery system of an abrasive for the grinding of steel slabs will be described.

FIG. 1 is a schematic perspective view of an abrasive water jet machining apparatus, and FIG. 2 is an equipment system diagram of an abrasive material recovery system according to the present invention.

In FIG. 1, A indicates an abrasive water jet machining apparatus provided in two lines, and the machining nozzles b of the arms a of each of the three robots are steel pieces S placed on the machining table c. Is scanned to perform grinding. After the grinding process, the abrasive is collected together with the processing water in the collecting tank d, and passes through the drag chain conveyor e and the water collecting tank f equipped with a grinding dust removing device having a size that hinders the operation of the collecting device. , Is processed by the abrasive material collecting system 1 arranged outdoors.

In the abrasive recovery system 1 of FIG. 2, the processed water containing the abrasives from the plurality of water collecting tanks f of the abrasive water jet processing apparatus A is first collected in the collecting tank 2 and stirred. It is agitated by the pump 3. Next, the agitated water is sent from a distribution tank 7 to a primary cyclone 8 constituting a separating device by a delivery pump 6 via a pipe 5 having a valve 4, and fine particles are removed in a secondary cyclone 9 and then a concentration tank. Sent to 10. The coarse particle-containing water concentrated in the concentration tank 10 is
The coarse-grained dehydrated cake that has been dehydrated by the centrifugal dehydrator 11 passes through the cake conveyor 12 and the cake hopper 13 and becomes substantially coarse dehydrated coarse-grained content in the rotary dryer 14. The dehydrated coarse particles are collected in the hopper 16 via the flow conveyor 15.

On the other hand, the filtrate from the centrifugal dehydrator 11 is introduced into the thickener 18 together with the ash content in the rotochron 17 for treating the exhaust gas from the rotary dryer 14, and the coagulant from the coagulant compounding hopper 19 is compounded. , Sludge is sludge bucket 20 and draining pit 2
1 and discarded. The exhaust gas from the rotoclon 17 is discharged from the exhaust stack 23 by the blower 22.

[0012] This equipment can be compactly assembled in a plane area of a relatively small area, and a recovery device for a relatively large volume of abrasive water jet machining, as in the case of grinding of steel billets. However, it is not a large-scale facility.

[0013]

The present invention has the following effects.

(1) It is possible to efficiently collect the abrasive during machining with the abrasive water jet, and reuse this to improve the utilization efficiency of the abrasive during the abrasive water jet machining.

(2) The equipment itself can be compactly assembled in a plane area having a relatively small area, and the equipment scale does not affect the arrangement of the processing equipment.

(3) Since it is supplied from the separation device including the concentration step to the drying device through the dehydrating device, efficient drying can be achieved.

[Brief description of drawings]

FIG. 1 is a schematic perspective view of an abrasive water jet processing apparatus according to an embodiment of the present invention.

FIG. 2 is a system diagram of an abrasive material recovery system according to an embodiment of the present invention.

[Explanation of symbols]

A Abrasive water jet processing device a Robot arm b Processing nozzle c
Processing table d Collection tank e Drag chain conveyor f Water collection tank S Steel slab 1 Abrasives collection system 2 Collection tank 3
Stirring pump 4 Valve 5 Piping 6
Delivery pump 7 Distribution tank 8 Primary cyclone 9
Secondary cyclone 10 Concentration tank 11 Centrifugal dehydrator 1
2 Cake conveyor 13 Cake hopper 14 Rotary dryer 15 Flow conveyor 16 Storage hopper 1
7 Rotocron 18 Thickener 19 Flocculant-containing hopper 20 Sludge bucket 21 Draining pit

Claims (1)

[Claims] 1. A collecting tank for collecting and agitating a mixed water of used abrasive and jet water from an abrasive water jet processing device, and fine particles having a particle size of less than 100 μm in the mixed water in the collecting tank are excluded. Separation device, a device for dehydrating particles having a particle size of 100 μm or more collected in the separation device, a drying device for drying the dehydrated particle cake, and dry particles obtained by the drying device Abrasive material recovery device for abrasive water jet machining, which has a hopper for storing the water.