JPH09295268A - Blasting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the recovery efficiency of a polishing material and also prevent the generation of chipping on a machined surface of a work. SOLUTION: A blast gun 5 is provided in a cabinet 91. A hopper 92 and recovery ducts 6, 6' for recovering a polishing material 99 jetted from the blast gun 5 are provided. A buffer device 1 is provided in the downstream of the recovery ducts 6, 6'. The buffer device 1 for carrying out the primary selection of an used polishing material 99 is composed of a stirring room 14 in which the flow of the polishing material 99 is kept in a turbulent state and a straightening room 15 for straightening the flow. A double structure type screen 11 is provided between these stirring room 14 and straightening room 15. Permanent magnets 12, 12' for removing a minute iron powder are provided in the stirring room 14. A classification device 2 for classifying the polishing material 99 primarily selected in these buffer device 1 and consisting of a cyclone 21 is provided. A supply pump 7 for supplying a prescribed polishing material 99 classified by the classification device 2 to the blast gun 5 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a blast processing apparatus for improving the recovery efficiency and classification performance of a used abrasive which is sprayed from a blast gun and used for processing. .

[0002]

2. Description of the Related Art A conventional blasting machine, in particular, a large blasting machine has a large cabinet 910 in which a plurality of blast guns 50 are installed, as shown in FIG. It is what Then, the used abrasives and the like ejected from the plurality of blast guns 50 are recovered through the hopper 920, the recovery duct 930, and the like, and these recovered abrasives are further large-sized (large-capacity). ) Is led to the cyclone 20 and is classified here. Further, these classified abrasives are collected in the recovery tank 30 and supplied from here to the blast gun 50 again by the supply pump 70.

[0003]

By the way, in the above-mentioned conventional device, the amount of the abrasives or grinding debris introduced into the cyclone 20 from the hopper 920 and the recovery duct 930 is also a large value. Therefore, the cyclone 20 for classifying a large amount of these abrasives and the like is required to have a large capacity. As a result, a large-sized cyclone 20 will be installed, and a large-sized dust collector 40 for introducing a negative pressure into the cyclone 20 will be adopted. That is, the negative pressure introduced into the cyclone 20 has a high value. Therefore, in the classification work performed by the cyclone 20, even the abrasive, which has a large specific gravity and should be considered to be reused, is sucked to the dust collector 40 side. as a result,
There is a problem that the efficiency of collecting the abrasives classified by the cyclone decreases. In addition, when the negative pressure introduced from the dust collector 40 is lowered to increase the recovery rate of the abrasives, the large size of secondary particles, which are large due to the abrasives solidifying each other, or large particles, etc. The impurities and the like will be collected in the collection tank 30, and these will clog the supply pump 70, the supply passage 720, the blast gun 50, and the like. In order to solve such a problem, between the hopper and the cyclone, which is a classifying device, a buffer device for performing primary sorting or the like of the above-mentioned used abrasives is provided, thereby improving the recovery efficiency of the abrasives. It is an object (problem) of the present invention to provide an improved blasting apparatus.

[0004]

Means for Solving the Problems To solve the above problems, the present invention takes the following measures. That is, in the invention described in claim 1, the blast gun for injecting the fine powdery abrasive toward the workpiece (work), the cabinet containing the blast gun and the like, and the workpiece are processed. From a recovery duct for recovering the abrasive, a classifier for classifying the abrasive, etc. recovered via the recovery duct, and a supply pump for supplying the abrasive classified by the classifier to the blast gun. Concerning the blasting apparatus, the hopper is provided in the lower part of the cabinet, which is sprayed from the blast gun and collects used abrasives and the like used for processing.
A plurality of recovery ducts that serve to send the used abrasive collected in the hopper to the next buffer device are continuously provided in the hopper, and the used abrasive introduced from the plurality of recovery ducts is primary. A buffer device for sorting and rectifying the flow of the abrasive material is provided, and the buffer device is provided with a classifying device for rectifying the flow and classifying the primary selected abrasive material, and further, the classifying device. It was decided to adopt a configuration in which the abrasives classified and carefully selected in step 1 were supplied to the blast gun through the supply pump and the like.

[0005] By adopting the above configuration, the present invention has the following functions. That is,
As shown in FIG. 1, after the abrasive material sprayed from the blast gun in the cabinet is processed into a work piece, the abrasive material and the grinding scraps cut out from the work piece fall into the hopper. go. Then, the abrasives and the like collected in the popper pass through the recovery duct, the buffer device,
Furthermore, it is sucked into the classifier. In such a process, in the present invention, the abrasives and the like sent out from the recovery duct are first removed of large impurities (dust) at the buffer device. That is, primary sorting (primary sorting) is performed. The flow of the abrasive or the like that has been subjected to the primary screening at the buffer device is rectified in the rectification chamber provided in the buffer device, and is sent to the next classifying device.

A rectifying duct is provided between the classifying device and the buffer device, and since negative pressure from the classifying device acts in the rectifying duct, the polishing sucked into the rectifying duct is performed. The material and the like are sucked into the next classifying device while being rectified. The abrasives and the like introduced into the classifying device in this way have already been subjected to primary sorting at the buffer device, and large impurities (dust) have been removed. Further, the flow of the abrasive is also rectified. Therefore, the cyclone forming the classifying device does not need to have a large negative pressure. That is, it may be of a small size and have a low negative pressure value. As a result, the recovery efficiency of the abrasive that is classified and collected by the cyclone can be improved.

In this way, the classification device (cyclone)
The abrasive material classified in (1) is sent out to a supply path by a supply pump, and then supplied to each blast gun.
Then, the abrasive supplied to the blast gun is again jetted from each of the blast guns and used for processing the work. In this way, the circulating action of the abrasive is performed.

Next, the invention according to claim 2 will be described. This is also basically the same as the first aspect. In addition to the above configuration, the feature thereof is that the buffer device is connected to the hopper side, and the agitating chamber into which the used abrasive from the hopper side is introduced in a turbulent state, A separation chamber and a screen, which are provided to separate the flow of the abrasive in the turbulent state, and to send the abrasive in the rectified state to the classifying device, and In addition, the permanent magnet is provided at the introduction port connected to the recovery duct connected to the hopper in the stirring chamber.

By adopting such a configuration, according to the present invention, in addition to the first aspect,
Further, the following operation is exhibited. That is, the used abrasive collected in the hopper and further introduced into the present buffer device through the recovery duct contains grinding dust and the like generated by the processing of the work. Therefore, the used abrasive contains a large amount of impurities such as the above-mentioned grinding dust or secondary particles produced by the used abrasives solidifying each other. The used abrasive also contains fine metal powder generated from the blasting machine itself.

By the way, according to the present invention, a stirring chamber is formed at the place where the hopper and the recovery duct are connected, and the used abrasive and the like introduced from the recovery duct are , Is stirred in the stirring chamber. Further, in the stirring chamber, a permanent magnet is provided at the introduction port which is the connection port of the recovery duct. Therefore, of the used abrasives and the like introduced into the stirring chamber, iron-based ones are first adsorbed and removed at the permanent magnet. In addition, large impurities such as the secondary particles are blocked at the screen. As a result, the abrasive introduced into the flow straightening chamber through the screen is sorted into those having a predetermined size or smaller by passing through the screen. Further, the iron-based fine powder is also removed at the permanent magnet. Furthermore, the flow of the abrasive is rectified by passing through the screen, and the flow of the abrasive introduced into the rectification duct from the rectification chamber is laminar. The abrasive material in such a state is sucked into the classifying device composed of a cyclone through the straightening duct. After such primary screening, large impurities and the like are removed, and therefore, the abrasive having a particle size limited to a certain extent is introduced into the cyclone, so that a large negative pressure is required for the cyclone. You don't have to have one. Therefore, it becomes possible to classify the abrasive with a relatively low negative pressure, and it is possible to improve the classification performance, that is, the recovery efficiency of the used abrasive.

Further, since the abrasive material recovered in this manner is in a state where iron-based fine powder having a large mass is removed, blasting is performed using these used abrasive materials. In such a case, it becomes possible to prevent the occurrence of chipping on the work surface of the work.

Next, the invention according to claim 3 will be described. This is also basically the same as the first and second aspects. The feature is that, in addition to the one described in claim 1 or 2, the screen provided in the buffer device is of a double structure type. By adopting such a configuration, in the present invention, the accuracy of the primary selection is further improved as compared with the ones described in the first and second aspects. That is, since the screen is composed of a double mesh structure or the like, large impurities and the like are removed more completely at the screen, and the abrasive passing through the screen is The size, that is, the particle size and the like can be made more uniform. Further, since the screen has a double structure, the flow of the abrasive passing through the screen and flowing into the rectifying chamber is further rectified. As a result, the flow of the abrasive material introduced from the rectifying chamber to the classifying device via the rectifying duct is laminarized, and the classifying performance of the classifying device (cyclone) is further enhanced.

Next, the invention according to claim 4 will be described. The basic point of this is also the same as that of claims 1 to 3. The feature is the configuration of the supply path for supplying the classified abrasive from the supply pump to the blast gun. That is, in the supply passage, the so-called fixed portion, which is mainly installed between the supply pump and the movable portion of the blast gun, is a stainless steel tube which is a conductive metal material. At the same time, the movable part formed around the blast gun is based on a hollow hose made of plastic, and a net made of a conductive metal material is provided on the outside thereof. The stainless steel tube and the metal net are connected to the ground. By adopting such a configuration,
In the above-mentioned supply passage through which the fine-powdered abrasive flows at high speed inside, the charge removal effect is enhanced. That is, in the above-mentioned supply passage, the fine-powdered abrasive made of glass beads or the like flows at a high speed,
Friction occurs between the inner surface of the tube or the hose forming the supply path and the abrasive, which causes static electricity. Therefore, in the present invention, in order to eliminate such static electricity, the above-mentioned conductive metal net or the like is provided to eliminate static electricity.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Although it relates to the embodiment of the present invention, the configuration is such that the plurality of blast guns 5 that are housed in the cabinet 91 and inject the abrasive 99 toward the work, and that are provided in the lower portion of the cabinet 91. And a hopper 92 that collects the used abrasive material 99 and the like that has been sprayed from each of the blast guns 5 and that has been used for processing the work, and a plurality of ducts that are continuously provided to the hopper 92. In the present embodiment, 2
The collection ducts 6 and 6 ′ composed of a book duct) and the abrasives 99 and the like collected in the collection ducts 6 and 6 ′ are introduced, and the used abrasives 99 are primarily selected. While collecting the buffer device 1, the classifying device 2 for classifying the abrasive material 99 primarily selected by the buffer device 1 and including a cyclone, and the abrasive material 99 classified by the classifying device 2 , A supply pump 7 for supplying the blast gun 5 for reuse.

With such a basic structure, a plurality of blast guns 5 are installed in the cabinet 91. In the present embodiment, four to eight blast guns 5 are installed. It has become so.
In addition, the hopper 92 that temporarily collects the abrasive 99 sprayed from the large number of blast guns 5 and the grinding scraps carved from the work is formed of a stainless steel plate in consideration of durability and the like. It has been done. The used abrasives 99 and the like collected in the hopper 92 in this manner are sent to the buffer device 1 through the two recovery ducts 6 and 6 '.

The buffer device 1 into which the used abrasive 99 or the like is introduced through the recovery ducts 6, 6'is such that the recovery ducts 6, 6'are connected as shown in FIG. , The stirring chamber 14 for keeping the flow of the abrasive 99 introduced from the recovery ducts 6, 6'in a turbulent state, and the classifying device 2
The rectifying ducts 3 and 3'which are connected to the rectifying duct 3 and 3'are connected to each other, and are basically composed of a rectifying chamber 15 which rectifies the flow of the abrasive 99. In such a basic configuration, a screen 11 is provided between the stirring chamber 14 and the rectifying chamber 15 for filtering large impurities (dust) composed of secondary particles and the like. . The screen 11 has a double mesh structure, and the roughness of the mesh can be changed between the first mesh and the second mesh, or if the mesh structure is completely different. It is also possible to make it possible. Further, depending on the case, the same one can be used in a state where two sheets are stacked.

In such a structure, the stirring chamber 14
The inlet ports 16 and 16 'to which the above-mentioned recovery ducts 6 and 6'are connected are provided in the left and right sides in a symmetrical manner. Therefore, the flows of the used abrasives 99 introduced from the left and right introduction ports 16 and 16 'interfere with each other and wind up. That is,
The flow of the abrasive material 99 in the stirring chamber 14 forms a turbulent flow. Further, as shown in FIG. 1, inside the main stirring chamber 14 having such a structure, at the left and right introduction ports 16 and 16 ′, as shown in FIG.
Permanent magnets 12 and 12 'are provided respectively. In the present embodiment, the permanent magnets 12 and 12 'are provided with a through hole in the vicinity of the central portion thereof, and the introduction ports 16 and 16' are passed therethrough. The abrasive material 99 and the like introduced from the above are smoothly introduced into the main stirring chamber 14. The abrasive 99 or the like introduced into the main stirring chamber 14 in this manner is a turbulent flow from the place where the used abrasive is flowing while it is flowing in the stirring chamber 14. The iron-based fine powder mixed in 99 is adsorbed at the permanent magnets 12 and 12 ', and the next rectifying chamber 1
It does not flow to the 5 side. That is, the iron-based fine powder is removed.

A rectifying chamber 15 provided through the screen 11 with respect to the agitating chamber 14 having such a structure.
Is the abrasive 99 that is turbulent in the stirring chamber 14.
The flow of is rectified (laminarized), and has a certain volume. The screen 11 having a double mesh structure is provided between the screen 11 and the stirring chamber 14. As shown in FIG. 1, in a part of the main rectification chamber 15 having such a configuration, the delivery ports 13 and 13 ′ to which the two rectification ducts 3 and 3 ′ connected to the classifier 2 are attached are symmetrically formed. It is supposed to be provided. In this way, the flow of the abrasive material 99 that has been rectified in the main rectification chamber 15 flows from the left and right delivery ports 13 and 13 ′ to the classification device 2 through the two rectification ducts 3 and 3 ′. Is sent out. In particular, in the present embodiment, the flow straightening ducts 3 and 3'are set so that their flows are equal on the left and right sides, respectively.
Are integrated at the entrance of the cyclone 21 forming the. Therefore, the cyclone 21
The flow of the abrasive material 99 introduced in (1) is further rectified (laminarized).

An abrasive material 99 or the like is introduced from the buffer device 1 having the above-mentioned structure through each of the rectifying ducts 3 and 3 ', and a classifying device for classifying the introduced abrasive material 99 and the like. As shown in FIG. 1, reference numeral 2 denotes a cyclone 21, a dust collecting device 23 connected to an outlet side of the cyclone 21 for collecting grinding dust having a relatively low specific gravity and classified by the cyclone 21, and the cyclone. Abrasive material 9 classified by No. 21 and having a predetermined specific gravity
And a collecting tank 22 for collecting the nine. In such a structure, as the cyclone 21 in the present embodiment, a small one having a high recovery efficiency of the abrasive 99 is adopted. The value of the negative pressure generated by the dust collector 23 is not so high. Therefore, among the abrasives 99 that are classified and collected by the main classifier 2,
Although there is a possibility that impurities having a large specific gravity are also included, in the present embodiment, the permanent magnets 12 and 12 ′ are provided in the stirring chamber 14 of the buffer device 1, and further, Since the screen 11 for performing the primary selection is provided at the boundary with the rectification chamber 15, impurities (dust) having a large specific gravity and a large amount are removed. Therefore, at the cyclone 21, the impurities having large specific gravity are no longer present. As a result, there is no problem even if the abrasive 99 is highly efficiently recovered at a low negative pressure.

A collecting tank 22 for collecting the abrasive material 99 classified by the cyclone 21 is provided on the downstream side of the cyclone 21 having such a structure. The abrasive material 99 collected in the collecting tank 22 is sent to the supply path 72 by the supply pump 7 driven by the motor 71, and the cabinet 91
It is designed to be supplied to each blast gun 5 installed therein. It should be noted that the main supply path 72 having such a configuration is provided from the supply pump 7 to the cabinet 91.
And a movable part 722 that is provided around the cabinet 91 and that moves with the operation of the blast gun 5. The fixed portion 721 is formed of a stainless steel tube, and the movable portion 722 includes a plastic hollow hose and a conductive metal material that covers the outside of the plastic hollow hose. It is designed to be formed with a net consisting of. Each of these parts 721 and 722 is adapted to be connected to the ground.

Next, the operation mode and the like of the present embodiment having such a configuration will be described.
That is, as shown in FIG. 1, the abrasive material 99 sprayed from the blast gun 5 in the cabinet 91 becomes a hopper together with the grinding dust and the like cut out from the work after the work is processed. It falls to 92. Then, the abrasives 99 and the like collected in the popper 92 are sucked into the buffer device 1 and further into the classifying device 2 via the recovery ducts 6 and 6 '. In such a process, the abrasive material 9 sent out from the recovery ducts 6 and 6 '
9 and the like, large impurities (dust) and the like are first removed at the screen 11 of the buffer device 1. Further, the iron-based fine powder discharged from the present blasting apparatus is adsorbed and removed at the permanent magnets 12 and 12 'installed in the stirring chamber 14. That is, the primary selection is performed. The flow of the abrasive 99 or the like that has been subjected to the primary selection at the buffer device 1 is rectified in the rectification chamber 15 provided in the buffer device 1 to the cyclone 21 of the next classification device 2. Sent out.

Two rectifying ducts 3, 3 ′ are provided between the cyclone 21 and the buffer device 1, and negative pressure from the classifying device 2 acts in these rectifying ducts 3, 3 ′. Therefore, the abrasive material 99 and the like sucked into the rectifying ducts 3 and 3 ′ are rectified (laminarized),
It is sucked into the cyclone 21 of the classification device 2.
The abrasives 99 and the like introduced into the cyclone 21 in this way have already been subjected to primary sorting at the buffer device 1, and large impurities (dust) have been removed. Further, the flow of the abrasive material 99 is also rectified. Therefore, the cyclone 21 forming the classification device 2 does not need to have a large negative pressure. That is, it may be a small-sized one having a small negative pressure value and a small capacity. As a result, the cyclone 21
The recovery efficiency of the abrasives that are classified and recovered in step 1 will be improved.

The abrasive material 99 classified by the classifying device 2 in this manner is sent out to the supply path 72 by the supply pump 7, and is supplied to each blast gun 5 from here.
The abrasive 99 supplied to the blast gun 5
Are again jetted from each of the blast guns 5 and used for processing the work. In this way, the circulating action of the abrasive 99 is performed. Note that, in such a circulating action, since the supply path 72 is subjected to static electricity removal processing, corona discharge or the like does not occur in the supply path 72, and accordingly, corona discharge or the like in the supply path 72. The wall separation and the like due to As a result, wear in the supply path 72 due to wall surface separation or the like is prevented.

[0024]

According to the present invention, there is provided a blast gun for spraying a fine powdered abrasive toward a workpiece (work),
A cabinet containing the blast gun and the like, a collection duct for collecting the abrasive used for processing the work,
Regarding a blast processing device including a classifying device that classifies abrasives and the like collected through the recovery duct and the like, and a supply pump and the like that supplies the abrasives classified by the classifying device to the blast gun, A hopper for collecting the used abrasives sprayed from the blast gun and used for processing the work is provided in the lower part, and has a role of sending the used abrasives collected by the hopper to the next buffer device. Provide a plurality of recovery ducts to perform, primary selection of the used abrasives introduced from the plurality of recovery ducts, and a buffer device for rectifying the flow of the abrasives, the flow in the buffer device Is equipped with a classifying device that classifies the abrasives that have been rectified and that is primarily selected, and the abrasives that are classified and carefully selected by the classifying device are Since the configuration is such that it is supplied to the blast gun via a pump or the like, large impurities such as secondary particles are removed at the buffer device, and primary screening is performed at the buffer device as described above. Since the flow of the abrasives that have been subjected to the rectification is rectified, the classifying device for classifying such abrasives may have a small negative pressure value. That is, by using a classifying device having a low negative pressure, it has become possible to improve the recovery efficiency of the used abrasive.

Further, the buffer device is divided into a stirring chamber and a rectifying chamber, and a permanent magnet is installed in the stirring chamber so that the iron-based fine powder discharged from the blasting device is discharged to the permanent magnet at the permanent magnet. Since it was removed, even if the value of the negative pressure of the classifying device is lowered, it is possible to prevent the heavy iron-based fine powder from being mixed into the abrasive collected by the classifying device. Became. As a result, it has become possible to prevent the occurrence of chipping on the work surface.

Further, by making the screen provided in the buffer device of a double structure type, large impurities such as secondary particles can be prevented.
It can be removed more completely. Also,
At the same time, it is possible to further straighten the flow of the abrasive, which flows through the screen to the straightening chamber. As a result, it becomes possible to further straighten (laminarize) the flow of the abrasive material introduced from the rectifying chamber to the classifying device through the rectifying duct, and in the classifying device (cyclone). It has become possible to further improve the classification performance. As a result, the efficiency of collecting the abrasive can be further improved.

[Brief description of drawings]

FIG. 1 is a skeleton diagram showing the overall configuration of the present invention.

FIG. 2 is a skeleton diagram showing an overall configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Buffer device 11 Screen 12 Permanent magnet 12 'Permanent magnet 13 Delivery port 13' Delivery port 14 Stirring chamber 15 Rectification chamber 16 Introduction port 16 'Introduction port 2 Classifier 21 Cyclone 22 Collecting tank 23 Dust collector 3 Rectification duct 3' Rectification Duct 5 Blast gun 6 Recovery duct 6'Recovery duct 7 Supply pump 71 Motor 72 Supply path 721 Fixed part 722 Movable part 91 Cabinet 92 Hopper 99 Abrasive material

Claims (4)

[Claims] 1. A blast gun for injecting a fine powdery abrasive material toward a workpiece (work), a cabinet containing the blast gun and the like, and a recovery for recovering the abrasive material used for processing the workpiece. In a blast processing device comprising a duct, a classifying device for classifying the abrasive recovered through the recovery duct, etc., and a supply pump or the like for supplying the abrasive classified by the classifying device to the blast gun, In the lower part of the cabinet, a hopper for collecting the used abrasives sprayed from the blast gun and used for processing is provided, and has a role of sending the used abrasives collected by the hopper to the next buffer device. A plurality of recovery ducts to be achieved are continuously provided in the hopper, and the used abrasives introduced from the plurality of recovery ducts are primarily sorted and the polishing is performed. A buffer device for rectifying the flow of the material is provided, the flow is rectified by the buffer device, and a classifying device for classifying the above-mentioned primary-selected abrasive material is provided. A blast processing apparatus, characterized in that it is configured to supply the blasted abrasive material to the blast gun via the supply pump or the like. 2. The blast processing apparatus according to claim 1, wherein the buffer device is connected to the hopper side and holds the flow of the used abrasive from the hopper side in a turbulent state. A rectifying chamber for separating the stirring chamber and the screen, and rectifying the flow of the abrasive in the turbulent state and sending the abrasive in the rectified state to the classifying device, And a permanent magnet provided in the stirring chamber. 3. The blasting machine according to claim 1 or 2, wherein the screen provided in the buffer device is of a double structure type. 4. The blasting apparatus according to claim 1, wherein a fixed portion of a supply path for supplying the classified abrasive to the blast gun through the supply pump is made of stainless steel. And the movable part that moves with the operation of the blast gun is formed of a plastic hollow hose and the outside of the plastic hose, and is formed of a conductive metal net. Blast processing equipment characterized by