JPH0236699Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention is an automatic blasting system that automatically cleans and polishes the surface of an object by spraying a large number of small-diameter particles together with compressed air onto the surface of the object. It is related to the device.

[Prior Art] Generally, in the manufacture of various parts, after various processes such as machining and welding are completed, and before final finishing processes such as painting are applied to the surface, the surfaces of the parts are cleaned and polished. Appropriate blasting treatments such as sandblasting and bead blasting are applied for this purpose.

FIG. 8 shows a support grid for a nuclear reactor fuel assembly, which is one of the parts (objects) to be blasted by this type of blasting device.

This support lattice 1 has a plurality of belt-shaped inner straps 2 arranged in a lattice shape at predetermined intervals, and sleeves 3 for fixing the guide tubes are inserted and fixed into predetermined lattice spaces of the inner straps 2. 2... are surrounded by a rectangular band-shaped outer strap 4..., and are fixed to a guide tube inserted into the sleeve 3..., so that the inner and outer straps 2..., 4... This supports a large number of fuel rods (not shown) that are inserted into the lattice space formed in this manner.

By the way, in manufacturing such a support grid 1, the above-mentioned inner and outer straps 2 are bonded by brazing.
4 are joined together and subjected to precision finishing and aging treatment on the outer surface, etc., and then bead blasted in a blasting machine to remove dust and oil adhering to the surface, and finished with final polishing. It is considered a quality item.

FIG. 9 shows a conventional blasting device used when performing the above-mentioned bead blasting on the support grid 1.

In FIG. 9, reference numeral 5 designates a chamber that accommodates the support grid 1 therein, and a side portion of the chamber 5 has the support grid 1 inside.
A door 6 for carrying in the chamber 5, rubber gloves 7, 7 for the worker located on the side of the chamber 5 to insert both hands into the chamber 5, and a door 6 located above the gloves 7, 7. A window 8 is provided for the operator to monitor the inside of the chamber 5. Also, inside this chamber 5,
In order to place the support grid 1, a large number of bars 9 are stretched horizontally at intervals, and a large number of beads (small diameter particles) are directed towards the support grid 1 within this chamber 5 together with compressed air. ) is provided. Further, at the bottom of this chamber 5, there is a blower ( (not shown) is provided. The dust separator 12 provided at the upper part of the chamber 5 has an exhaust pipe 14 and a dust collector for exhausting the dust inside the chamber 5 separated by the dust separator 12 to the outside. An exhaust mechanism (not shown) is provided.

In the above-mentioned conventional blasting apparatus, first, the material is carried into the support grid 1 and the chamber 5 through the door 6, and after the door 6 is closed, the blower is operated to create a negative pressure in the chamber 5. In this state, the worker puts both hands into the gloves 7, 7, holds the support grid 1 with one hand through the gloves 7, 7, and holds the manual nozzle 10 with the other hand. the support grid 1 by operating the manual nozzle 10 while monitoring the internal state through the window 8.
The support grid 1 is blasted by spraying beads onto the support grid 1.

[Problems to be Solved by the Invention] However, the conventional blasting device described above relies solely on manual work in which the worker sprays beads onto the support grid 1 while operating the manual nozzle 10 with one hand. Therefore, there was a problem that the work itself required a long time and was inefficient. In addition, the work itself is difficult and requires skill, making it difficult to achieve uniform blasting, and there are also problems in that quality varies from product to product depending on the worker.

[Purpose of the invention] This invention was made in view of the above circumstances.
Even if the object has a relatively complex shape, such as a support grid, and there are welding points on the inside and the surface needs to be smoothed, it can be made uniformly on the inside and outside surfaces without the need for manual labor. The object of the present invention is to provide an automatic blasting device that can reliably perform blasting in a short period of time.

[Means for Solving the Problems] The automatic blasting device of this invention includes a chamber that airtightly accommodates the support grid, and a chamber in which the support grid can be rotated horizontally and freely within the horizontal plane. A holding mechanism that holds the upper and lower surfaces and side surfaces in an open state, and a holding mechanism that is arranged above and below the support grid held by this holding mechanism at a predetermined angle with respect to the horizontal plane and is swingable within the horizontal plane. A side nozzle is held on the side of a support grid held by a holding mechanism so as to be able to swing vertically, and compressed air and an air supply mechanism that injects the small-diameter granular material; an exhaust mechanism that exhausts air in the chamber to the outside; and a control mechanism that controls injection and rocking of the nozzle and rotation of the holding mechanism from outside the chamber. It is configured with the following.

[Example] Figures 1 to 7 show an example of an automatic blasting device of this invention, and parts common to those shown in Figures 8 and 9 are given the same reference numerals.
The explanation will be omitted.

1 to 3, in the automatic blasting apparatus of this example, a holding mechanism 20 for the support grid 1 is provided in the chamber 5 in place of the bars 9 shown in FIG. This holding mechanism 20 includes a rotating shaft 21 vertically and rotatably supported at the center of the chamber 5, and an output shaft attached to the rotating shaft 21.
A motor 2 connected to the motor through a pulley and a belt.
2, and a turntable 23 that is attached to the rotating shaft 21 and rotatably holds the support grid 1.
It consists of. Here, the turntable 23 is a plate-like member having a substantially cross shape in a plan view, and support rods 24 projecting upward are integrally provided on the upper surface of each side of the turntable 23. There is. The support grid 1 to be subjected to blasting is rotatably held on the turntable 23 with the support rods 24 inserted into the sleeves 3.

Further, above and below and on one side of the support grid 1 on the holding mechanism 20, as shown in FIGS.
5, 25, 26, 26, 27, 28, 28, 29
is installed. Of these, the nozzles 25 and 25 located above the support grid 1 are arranged to extend from a position approximately 90 mm above the top surface of the support grid 1 to the top surface of the support grid 1 at right angles to each other and approximately approximately 90 mm above the top surface of the support grid 1. These nozzles 25, 25 are arranged so as to spray beads from a direction inclined at 45 degrees, and these nozzles 25, 25 are connected to a pair of rotating shafts 30, which are rotatably provided on the sides of the holding mechanism 20, respectively. 30 via arms 31, 31.
On the other hand, below the rotation shafts 30, 30, the nozzles 26, 26, 27 located below the support grid 1 are connected to the arms 32, 32 in the same way.
It is attached via. Here, the nozzles 26, 26 are arranged from a position approximately 70 mm below the lower surface of the support grid 1 to the lower surface of the support grid 1 in opposite directions facing each other and inclined at approximately 60 degrees with respect to the upper surface. It is arranged so that beads are sprayed from all directions. In addition, the nozzle 27
is arranged so as to spray beads from a position approximately 110 mm below the lower surface of the support grid 1 mainly onto the inner wall surface of the outer strap 4 of the support grid 1 from a direction inclined at an angle of about 45°. The rotating shafts 30, 30 to which these nozzles 25, 25, 26, 26, 27 are attached are attached to the chamber 5.
Within an angle range of 90° to 120°, the drive motor 33 and drive rod 34 provided on the top of the
It is designed to be rotated back and forth. As a result, the nozzles 25, 25, 26, 26, and 27 are caused to reciprocate while drawing circular arcs of a predetermined length, as shown by the arrows in FIG.
25, 26, and 26, as shown in FIG.
As for No. 7, as shown in FIG. 7, beads are sprayed mainly in the direction of the sides of the lower surface of the support grid 1. Further, the nozzles 28, 28 are disposed so as to spray beads in a direction approximately perpendicular to the side surface of the support grid 1 from a position approximately 30 mm away from the side surface in the horizontal direction. These nozzles 28, 28 are attached via arms 36, 36 to a rotation shaft 35 provided horizontally on the side of the support grid 1 so as to be freely rotatable, and the rotation shaft 35 One end is connected via a drive link 38 to a drive motor 37 that is provided on the side of the chamber 5 and rotates the rotation shaft 35 back and forth. These rotating shafts 30, 30, 35, drive motors 33, 37, drive rod 34, and drive link 3
8 constitutes a nozzle drive mechanism. Note that the nozzle 29 is a manual nozzle that is attached to the inner wall of the chamber 5 and is operated by the worker from inside the glove 7 when particularly required.

In this automatic blasting device as well, the air in the chamber 5 is sucked and the dust contained therein is separated, and then the nozzles 25, 25, 26, 26, 27, 28, 2
8 and 29, and exhausts the dust separated by the dust separator 12 to the outside of the chamber 5. An exhaust mechanism consisting of an exhaust pipe 14 and a dust collector 39 is provided.

The holding mechanism 20 and the nozzles 25, 25, 2 are provided on the side and upper part of the chamber 5.
6, 26, 27, 28, 28, and a control panel (control mechanism) 40 that controls the air supply mechanism and the exhaust mechanism. In FIG. 1, reference numeral 41 indicates a flashing lamp to indicate that the nozzle is in operation, and reference numeral 42 indicates an operating switch for operating the manual nozzle 29. be.

Next, the operation of this automatic blasting device having the above configuration will be explained.

First, after placing the support grid 1 on the turntable 23 of the holding mechanism 20 in the chamber 5, the door 6
Close. Next, after operating the control panel 40 to activate the blowers and fans of the air supply mechanism and exhaust mechanism, the automatic switch on the control panel 40 is pressed.
Then, the motor 22 of the holding mechanism 20 and the drive motors 33, 37 of the nozzle drive mechanism are activated, the support grid 1 is rotated, and the nozzles 25, 25, 26, 26, 27, 28, 28 are rotated.
starts a reciprocating motion that draws a predetermined arc shape. At the same time, the upper nozzles 25, 25 and the side nozzles 28, 28 of the support grid 1 are activated for a predetermined set time by a timer.
Beads are sprayed towards. When the spraying is finished, the side nozzles 28, 28 and the lower nozzle 2 of the support grid 1 are then
6, 26, and 27, beads are sprayed toward the support grid 1 rotated by the holding mechanism 20 for a predetermined set time by a timer. In this way, after the beads are sprayed onto the upper and lower surfaces and side surfaces of the support grid 1, the nozzle 2
Compressed air is sent to air nozzles (not shown) provided at each of 5, 25, 26, 26, 27, 28, and 28, and blowing air is blown from the air nozzles toward the support grid 1. It will be done.
When the blowing air stops after a predetermined period of time has elapsed, the drive motors 33, 3
7 and the motor 22 of the holding mechanism 20 stop operating,
The end buzzer sounds and the series of blasting processes for the support grid 1 are completed.

According to such an automatic blasting device, the support grid (object) 1 is held by the holding mechanism 20 in the chamber 5, and the nozzles 25, 26, 2 are installed above, below, and on the sides of the support grid 1.
These nozzles 25, 29 are arranged by a control panel 40 provided outside the chamber 5.
26, 27, 28, and 29, the blasting process can be automatically performed on the support grid 1 without any manual effort. Therefore, the time required for blasting the support grid 1 can be greatly reduced.
Further, the nozzle drive mechanism allows the nozzles 25, 2 to
6, 27, 28 are reciprocated so that these nozzles 25, 26, 27, 28 as a whole spray beads over the entire area of the upper and lower surfaces and side surfaces of the support grid 1, and further parallel to this, the nozzles 25, 26, 27, 28 are Since the support grid 1 is rotated by the holding mechanism 20, the entire surface of the support grid 1 can be uniformly blasted. Therefore, the blasting effect on a large number of support grids 1 is made uniform, and product quality can therefore be improved.

[Effects of the invention] As explained above, the automatic blasting device of this invention includes a chamber that airtightly houses the support grid;
A holding mechanism that holds the support grid horizontally and freely rotatable within the horizontal plane and with the upper and lower surfaces and side surfaces of the support grid open within this chamber; The upper and lower nozzles are arranged at a predetermined angle with respect to the horizontal plane and are swingable within the horizontal plane, and the side nozzles are held swingably up and down on the sides of a support grid held by a holding mechanism. a nozzle; an air supply mechanism that injects compressed air and the small diameter particles into the chamber through the upper and lower nozzles and the side nozzles; an exhaust mechanism that exhausts the air in the chamber to the outside; Since it is equipped with a control mechanism that controls the injection, rocking, and rotation of the holding mechanism from outside the chamber, it can be used for objects with relatively complex shapes such as support grids, and even inside the chamber. Even if there is a welded area and the surface needs to be smoothed, uniform blasting can be done quickly and reliably on the inside and outside surfaces, making it possible to manufacture support grids of high quality at low cost. It is something.

[Brief explanation of the drawing]

Figures 1 to 7 show an embodiment of the automatic blasting device of this invention, in which Figure 1 is an overall perspective view with the main parts cut away, Figure 2 is a side view of the main parts of the holding mechanism, FIG. 3 is a - line view of FIG. 2, and FIGS. 4 and 5 are perspective views showing the arrangement of nozzles, respectively.
Figures 6 and 7 are perspective views showing the spraying range of beads (small-diameter particles) from the nozzle, respectively, and Figure 8 is a nuclear reactor fuel assembly subjected to blasting by the automatic blasting device of this embodiment. FIG. 9 is an overall perspective view showing a conventional blasting device with main parts cut away. 1...Support grid (object), 5...Chamber,
6...door, 7...gloves, 8...window, 11...transfer pipe, 12...particle separator, 14...exhaust pipe, 20
... Holding mechanism, 21 ... Rotating shaft, 22 ... Motor, 23 ... Turntable, 24 ... Support rod,
25, 26, 27, 28, 29... Nozzle, 3
0, 35... Rotating shaft, 31, 32, 36... Arm, 33, 37... Drive motor, 34... Drive rod, 38... Drive link, 39... Dust collector, 4
0...Control panel, 41...Lamp, 42...Operation switch.

Claims (1)

[Claims for Utility Model Registration] Cleaning and polishing of the support grid by spraying a large number of small-diameter particles together with compressed air onto the inner and outer surfaces of the support grid of a fuel assembly constructed by combining straps made of metal bands in a grid pattern. an automatic blasting device for carrying out the blasting process, comprising: a chamber for airtightly housing the support grid;
a holding mechanism that holds the support grid horizontally and rotatably in a horizontal plane within the chamber with the upper and lower surfaces and side surfaces of the support grid open; and the upper and lower sides of the support grid held by the holding mechanism The upper and lower nozzles are arranged at a predetermined angle with respect to the horizontal plane and are swingable in the horizontal plane, and the side nozzles are held on the side of the support grid held by the holding mechanism so as to be swingable up and down. a nozzle; an air supply mechanism that injects compressed air and the small diameter particles into the chamber through the upper and lower nozzles and the side nozzles; an exhaust mechanism that exhausts the air in the chamber to the outside; An automatic blasting device comprising: a control mechanism that controls injection, rocking, and rotation of the holding mechanism from outside the chamber.