JPH0616988B2 - Blasting device - Google Patents

Description

Detailed Description of the Invention [Industrial applications]

The present invention relates to a blasting device that blows a polishing agent onto a work at a high speed together with an air stream, and has a conveying device that feeds a large number of works with stirring so that the blasting process can be performed continuously. Regarding what you have done.

[Prior art]

The blast treatment does not cause waste liquid pollution unlike the degreasing and pickling treatments, in which an average cleaning effect is obtained at various places on the work. Since it is non-directional grinding, it has various advantages such as avoiding stress concentration on the work, less work grinding amount, and no waste of material, etc. Alternatively, a blasting device that is suitable as a deburring method for plastic molded products and configured to easily perform such processing is expected to have a great demand in the future. Among such blasting devices, those having a blasting nozzle mix the abrasive with the air flow sent from an air supply device such as a compressor or a blower. It is configured to eject at high speed from a blast nozzle. As a method of mixing the abrasive cleaning material into the air ejected from the blast nozzle, connect the abrasive cleaning material supply pipe from the abrasive cleaning material reservoir to the blast nozzle into which high-speed air is sent, and use the negative pressure generated in the nozzle to perform the cleaning operation. A so-called suction method that sucks out the material, and a grinding and cleaning material supply pipe from the grinding and cleaning material tank is connected in the middle of the air supply pipe that sends air to the blast nozzle, and the air supply pipe and the grinding and cleaning material tank are bypass pipes. The static pressures of the air supply pipe and polishing / cleaning material tank were made equal by connecting with each other, and the polishing / cleaning material in the polishing / cleaning material tank was sent to the air supply pipe while falling by gravity through the polishing / cleaning material supply pipe. The so-called direct pressure method is generally used.
Further, the blasting device is a so-called shot blasting device in which the blasting material is jetted by the blast nozzle as described above, and the blasting material is ejected at a relatively high speed by a centrifugal projection device having a rotary impeller. There are also things.

[Problems to be Solved by the Invention]

By the way, when industrially blasting a large number of works, it is necessary to stir the works in the blast chamber because it is necessary to uniformly process all the works. Further, in order to efficiently perform the blast treatment, it is desired that the work is continuously flown into the blast chamber and the continuous blast treatment is performed. In this way, as a conveying device that achieves the two functions of stirring a work and continuously conveying a work, as shown in, for example, Japanese Patent Publication No. 63-17593, a spiral is provided on the inner circumference. A cylindrical drum provided with ridges is arranged sideways, and when this drum rotates, workpieces continuously fed from its inlet are stirred and sent to the outlet by a spiral ridge. Is proposed. The outer periphery of the drum is made of a member such as a wire net through which the polishing / cleaning material can pass, and the polishing / cleaning material is projected from the outside into the drum. However, in the above-mentioned conventional conveying device, since the abrasive material is projected from the outside of the drum, the energy of the abrasive material is attenuated by the wire mesh on the outer periphery of the drum, and the efficiency of the blasting process is lowered. In addition, there is a problem that the arrangement position of the blast nozzle or the centrifugal projection device is restricted by the size of the drum, and these cannot be arranged at an optimum distance based on the work. For example, if the diameter of the drum is increased, the distance from the blast nozzle or the centrifugal projection device to the work in the rotary drum becomes large, so that it is impossible to increase the amount of conveyance of the work beyond a certain level. The present invention was devised under the above circumstances, and the distance from the blast nozzle or the centrifugal projection device to the work can be freely set, and a large amount of work can be effectively stirred. It is an object of the present invention to provide a blasting device equipped with a novel transporting device that can continuously transport the blasting device.

[Means for Solving the Problems]

In order to solve the above problems, the present invention takes the following technical means. That is, in a blasting device configured to be provided with a blast chamber and a transfer device that continuously feeds a work in the blasting chamber, and to perform a blasting process by projecting a cleaning material onto the work on the transfer device, The conveying device wraps a flexible endless belt having a predetermined width in a mesh shape around a plurality of support rollers at both ends in the width direction, so that a part of the endless belt is not supported in its width direction intermediate portion. While forming a work transporting section that travels in a U-shape or J-shape in cross section, a plurality of rigid support rods extending in the width direction of the endless belt are provided on the outer peripheral surface of the endless belt at predetermined intervals in the longitudinal direction of the endless belt. Install each
By attaching a plurality of blades extending substantially in the longitudinal direction of the endless belt and having a predetermined height to each supporting rod so that the positions of the blades of the adjacent supporting rods are displaced in the width direction of the endless belt, It is characterized in that the blades attached to the support rod cooperate with each other to form an inclined ridge inclined on the outer peripheral surface of the endless belt with respect to the longitudinal direction thereof.

[Action]

Since the work transfer section formed by the endless belt has a U-shaped or J-shaped cross section with an open upper side, the polishing and cleaning material is directly projected onto the work introduced into this section. be able to. In addition, since the blades of each supporting rod cooperate to form an inclined ridge on the outer peripheral surface of the endless belt including the work conveying unit, when the supporting roller is rotated to rotate the endless belt, In the work transfer section, the inclined ridges move in the width direction of the endless belt. Therefore,
The work introduced into the work transfer section is agitated by the bottom wall having a U-shaped or J-shaped cross section moving in the longitudinal direction of the endless belt, and the endless belt is moved by the slanting ridges moving as described above. It will be sent in the width direction of the belt.

【The invention's effect】

As a result of the above, it is possible to achieve a conveying device in which the work can be directly sprayed with the polishing and cleaning material while being effectively stirred and continuously fed. Further, by increasing the U-shaped or J-shaped cross-sectional width of the work transfer section, it is possible to dramatically increase the work capacity and significantly increase the efficiency of the blasting process. Further, the endless belt is made of a flexible material such as a wire mesh, and when forming the U-shaped or J-shaped work conveying portion, it is wound around a plurality of supporting rollers at both widthwise end portions. It is necessary to eliminate the support of the intermediate portion in the width direction so that the cleaning material can be transmitted, but since the rigid support rod supporting each blade is fixed in the width direction of this endless belt, As described above, even if only the widthwise both ends of the endless belt are supported, the rigidity of the intermediate portion that can pass through the abrasive material can be conveniently maintained. Further, since each blade is not directly fixed to the mesh-shaped endless belt but is attached to the support rod, the attaching workability can be improved. Further, it is possible to easily increase the width of the endless belt to form a work transfer section having a sufficient length.

[Explanation of Examples]

Hereinafter, embodiments of the blasting device of the present invention will be specifically described with reference to the drawings. FIG. 1 shows the entire structure of an example of a blasting device 1 to which the present invention is applied. Inside the box-shaped blast chamber 2, a carrier device 3 characterized by the present invention is incorporated. Denoted at 4 are blast nozzles for projecting the abrasive material onto the work sent by the carrying device 3. To the blast nozzles 4 ..., a polishing / cleaning material supply hose 6 for guiding the polishing / cleaning material from a separator 5 arranged in the upper part of the blast chamber, and a high-speed air flow from an air generator such as a roots / blower not shown. Air supply hoses 7 for guiding are connected to each other, so that high-speed air appropriately mixed with a cleaning material is jetted from the tip of the nozzle. The blast nozzles 4 ... Are usually supported by a support tool (not shown) so that the position and orientation can be adjusted. The blasting material that has finished the blasting process and has fallen to the hopper-shaped bottom of the blasting chamber 2 is returned to the above-described separator 5 via the air carrying pipe 8, and here, the dust generated from the blasting material by the blasting process is returned. Are to be separated. Then, the polishing / cleaning material accumulated at the bottom of the separator is again supplied from the polishing / cleaning material supply hose 6 to the blast nozzle 4. An exhaust pipe 9, a suction blower 10 and a dust collector 11 are connected to the outlet of the separator 5, and the above dust is collected in the dust collector 11. Note that the basic functional configuration of the blast device described above is merely an example, and as described above, there are other methods for projecting the abrasive cleaning material. The present invention is characterized by the conveying device described below, and this conveying device is applied to all types of blasting devices other than the above-mentioned type of blasting device. Hereinafter, the details of the carrier device 3 will be described. With respect to the two upper rollers 14 and 15, which are arranged in parallel with each other so as to extend across the opposite side walls 12 and 13 of the blast chamber 1 at a predetermined interval in the plane direction, and the upper rollers 14 and 15 described above. And a lower roller 16 parallel to the upper rollers 14 and 15 at a position lowered by a predetermined distance.
Are rotatably supported. Each of these rollers 14, 15 and 16 has a constant length according to the transport length, and in this example, all rollers have the same outer diameter. Then, the rollers 14, 15 on the support shafts 17, 18, 19 of the upper rollers 14, 15 and the lower roller 16,
As shown in FIG. 2, the support wheels 20 each having a predetermined outer diameter are provided at both end portions adjacent to both end portions of 16 respectively.
a, 21a, 22a, 20b, 21b, 22b are attached. However, the wheels 20a, 20b, 21a, 21b attached to the upper roller support shafts 17, 18 have the same outer diameter and are fixed to the support shafts 17, 18, and are attached to the lower roller support shaft 19. 22
a and 22b have a larger diameter than other wheels,
It is rotatably supported by the support shaft 19 via a bearing (not shown). Then, the both side walls 1 are provided at both ends of the transport device 3.
The work carrying-in drum 23 and the work carrying-out drum 24, which penetrate through Nos. 2 and 13 with the same axis, respectively, are the above-mentioned three wheels 20a, 21a, 22a,
Also, the outer circumferences of the rollers 14 and 15 are simultaneously contacted with the rollers 20b, 21b, and 22b, and are supported so as to be rotatable in synchronization with the rollers 14, 15, and 16. The inner ends of the work loading drum 23 and the work unloading drum 24 are the first
As shown in the figure, the upper rollers 14 and 15 are extended to both ends so as to be slightly overlapped in the axial direction. A spiral ridge 25 is formed on the inner circumference of the work carrying-in drum 23 and the work carrying-out drum 24 so as to send the work to and from the work carrying section described later. Also, the upper roller support shafts 17, 1
Reference numeral 8 denotes a sprocket 26 attached to a tip end portion protruding to the outside of the side wall 12 and a motor 36 mounted on the upper surface of the blast chamber.
The chain 27 is hung around the sprocket 37 attached to the output shaft of the above to be rotationally driven. The upper rollers 14 and 15 and the lower roller 16 or the work loading and unloading drums 23 and 24 configured as described above are made of wire mesh or the like having a width corresponding to the lengths of the rollers 14, 15, and 16. The endless belt 28 thus formed is wound around as shown in FIG. That is, the endless belt 28 is wound around the outer sides of the rollers 14, 15 and 16, and both end portions in the belt width direction of the portion extending between the upper rollers 14 and 15 are formed by the work loading drum 23 and the work unloading drum 24. It is wound around the lower half of each inward extending portion, whereby the work conveying portion 29 that travels in a U-shaped or J-shaped cross section without supporting the widthwise intermediate portion is provided on the outer periphery of the endless belt 28. It will be formed in part. Next, as described above, the endless belt 28 wound around the rollers and the drum and having the work conveying section 29 formed thereon.
A support rod 3 having a plurality of blades 30 on the outer circumference of the support rod 3
1 are attached at equal intervals in the longitudinal direction of the endless belt. In this embodiment, the support rod 31 has a long bolt 32 having threads formed at both ends as a core member, and each blade 30 and a resin spacer 33 are alternately inserted into the support rod 31, as shown in FIG. At the same time, the nuts 34 are screwed into the threaded portions at both ends, and each blade 3
It is configured by fixing 0. Each blade 30 can be simply configured by forming a resin plate having a constant plate thickness in a predetermined shape and providing a hole for passing the bolt 32, and its side surface shape is as shown in FIG. In addition, when the support rod 31 is located in the work transfer section 29, it cooperates with the blades 30 of the adjacent support rods to form a continuous convex wall having no clearance. In addition, in this example, the ends of the spacers 33 are cut slightly obliquely so that the blades 30 are slightly inclined with respect to the longitudinal direction of the endless belt 28. Then, the blades 30 of the support rods 31 fixed to the outer circumference of the endless belt 28 at equal intervals as described above are attached to the adjacent support rods 31 as schematically shown in FIG. The attached blades 30 are slightly displaced in the lateral width direction of the endless belt 28. As a result, the blades 30 adjacent to each other in the belt longitudinal direction of the support rods 31 cooperate with the surface of the endless belt 28. Thus, a plurality of inclined ridges 35 that are inclined in one direction with respect to the longitudinal direction of the endless belt 28 are formed. The length of the support rod 31 is the same as that of the work transfer drum 23.
Should be set to be slightly smaller than the distance between both inner ends of the work unloading drum 24, and similarly, each support rod 31 should pass between the inner ends of the work transporting drum 23 and the work unloading drum 24. It should be fixed on the endless belt 28. Further, each support rod 31 can be easily fixed to the outer circumference of the wire mesh-shaped endless belt 28 by a hog ring or by bundling under certain conditions. In the above structure, the upper rollers 14 and 15 are connected by the arrow A.
When it is driven to rotate in the direction, the endless belt 28
Start traveling in the same direction, and the wheels 20a, 2
The work carry-in drum 23 and the work carry-out drum 24, which are contacted and supported by the la, 22a, 20b, 21b, and 22b, also start to rotate. Then, the cross section U of the endless belt 28
In the character-shaped work transfer unit 29, the blades 30 of each support rod 31 are inclined with respect to the traveling direction of the belt and form continuous sloped ridges 35, and the sloped ridges 35 of the work carrier 29 are used. The upper part moves from the work loading drum 23 to the work unloading drum 24, that is, in the direction of arrow B. Here, when a work is loaded into the entrance of the work loading drum 23 from a work loading chute (not shown), the work is rotated by the spiral ridge 2 on the inner circumference of the rotating work loading drum 23.
5, and is sent out onto the work transfer section 29 of the endless belt 28. In the work transfer section 29, since the U-shaped bottom part thereof moves in the belt longitudinal direction, the work is conveniently agitated, and also, the work transfer drum 24 is moved by the inclined projections 35 that move as described above. Will be sent to.
That is, the work can be conveniently stirred while being continuously fed on the work transport path 29, and can be directly and efficiently subjected to the blast treatment from the blast nozzle 4. Then, the work that has finished the blasting process and has reached the end of the work transfer path 29 is processed by the work unloading drum 2
4 and then is sent to the drum outlet by the spiral ridge 25 and finally discharged. Of course, the scope of the present invention is not limited to the above embodiments. The means for loading and unloading the work to and from the work transfer unit formed on the endless belt according to the present invention is not limited to the embodiment. Further, in the embodiment, the cross section of the work conveying portion formed on the endless belt is U-shaped, but it is J-shaped by lowering the position of one upper roller from the position of the other upper roller. You can also Then, as will be repeatedly described, the method of blasting the work on the work transfer section is performed by a blast nozzle as in the embodiment and by a centrifugal projection device as shown in Japanese Patent Publication No. 63-17593. In some cases. In addition, in the embodiment, each blade 3 is attached to each support rod 31.
Although 0 is attached with a slight inclination in the longitudinal direction of the endless belt, even if the blades of adjacent support rods 31 are slightly offset from each other in the width direction of the belt even if the blades are not particularly inclined in this manner. As a whole, an inclined ridge in which the blade row shown in FIG. 6 is inclined is formed. Moreover, of course, the purpose of the blast is not limited. That is, in addition to deburring resin molded products, blasting is performed for various purposes such as deburring metal molded products and forming a base for metal parts.

[Brief description of drawings]

FIG. 1 is a sectional view of the entire structure of an embodiment of the present invention, FIG. 2 is a sectional view taken along the line II-II of FIG. 1, and FIG. 3 is a section of II of FIG.
A sectional view taken along the line I-III, FIG. 4 is a detailed plan view of a structure for attaching each blade to a support rod, FIG. 5 is a detailed side view of a row of blades in a work conveying section of an endless belt, and FIG. 6 is a blade. FIG. 7 is a schematic development view of an endless belt to which a supporting rod having a groove is attached. 1 ... Blasting device, 2 ... Blasting chamber, 3 ... Conveying device, 14, 15, 16 ... Supporting roller, 28 ... Endless belt, 29 ... Work conveying blade, 30 ... Blade, 31 ... Supporting Rod, 35 ... Inclined ridge.

Claims (1)

[Claims] 1. A blasting device comprising a blast chamber and a transfer device for continuously feeding a work in the blasting chamber, and configured to project a blasting material onto the work on the transfer device to perform a blasting process. In the conveying device, the flexible endless belt having a predetermined width is wrapped around several supporting rollers at both ends in the width direction so that a part of the endless belt has an intermediate portion in the width direction. While forming a work transporting section that travels in a U-shape or J-shape in cross section without being supported, a plurality of rigid support rods extending in the width direction of the endless belt are formed on the outer peripheral surface of the endless belt in the longitudinal direction of the endless belt. At a predetermined interval,
By attaching a plurality of blades extending substantially in the longitudinal direction of the endless belt and having a predetermined height to each supporting rod so that the positions of the blades of the adjacent supporting rods are displaced in the width direction of the endless belt, A blasting device, characterized in that blades attached to a support rod cooperate with each other to form an inclined convex line which is inclined with respect to the longitudinal direction on the outer peripheral surface of the endless belt.