JPH081517A - Air blast apparatus - Google Patents

Abstract

PURPOSE:To provide an air blast apparatus with simple structure and low cost, which can carry out air blast while selecting freely both systems of gravity jet type and pressure jet type in a jet chamber. CONSTITUTION:In an air blast apparaus having a dust collector 45 connected to a jet chamber 8 through a recovering device 24 of a jet material, a hopper 27 for receiving recovered jet material is continuously connected to the recovering device 24 and a jet material ejecting conduit 30 having the ejecting end 32 adjacent to a jet material receiving part 18 of a pressure tank 13 is connected to the bottom of the hopper 27 so that the conduit 30 is provided sequentially with a pipe-like connecting part 33 and a switch device 35 for a jet material flow path. Also, in the jet chamber 8, a pressure jetting air blast nozzle 10 connected through a hose 12 to the pressure tank 13 and a gravity jetting air blast nozzle 1 connected through a hose 4 to the pipe-like connecting part 33 are disposed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is directed to deburring by ejecting a projection material from an air blast nozzle onto various works in a projection chamber.
The present invention relates to an air blast device that removes scale, removes a coating film, and the like.

[0002]

2. Description of the Related Art Generally, gravity blasting and pressure blasting are available as air blasting systems in which a dust collecting device is connected to a projection chamber for carrying out a blasting work with an air blast nozzle through a blasting material collecting device. There is a formula. As shown in FIG. 4, the gravity projection type air blast device has a compressed air supply pipe 3 and a hose 4 for supplying projection material connected to a hollow portion (not shown) formed in the nozzle body 2 of the gravity projection air blast nozzle 1. , One end of the hose 4 is made to face the bottom opening 6 of the hopper 5 for containing the shot material S so that the secondary air can be sucked, and when the valve 7 provided in the compressed air supply pipe 3 is opened, the compressed air is released. The shot material S in the hopper 5 is jetted out into the hollow portion of the nozzle body 2 and the negative pressure generated in the hollow portion is used.
Is sucked into the nozzle main body 2 through the hose 4, accelerated from the tip thereof, and jetted to the work in the projection chamber 8 to carry out polishing. Then, the blast material after blasting and dust such as burrs and blast material particles that have been removed are conveyed from a recovery pipe 9 connected to the bottom of the projection chamber 8 to a recovery device such as a cyclone type, and the blast material S is The dust is separated and collected and sent to the hopper 5, and the dust is introduced into the dust collector and separated and removed.

On the other hand, in the pressure projection type air blasting device, as shown in FIG. 5, one end of a hose 12 for feeding a projection material connected to a nozzle body 11 of a pressure projection air blast nozzle 10 is connected to a pressure tank 13. Is connected to one end of a mixing chamber 14 formed in the lower part of the
Is connected, and the tip of the branch pipe 16 on the way is directed upward, and a mountain-shaped on-off valve 17 is fitted so as to be able to move up and down. When the on-off valve 17 rises, its mountain portion is formed above the pressurizing tank 13. The projection material receiving portion 18 comes into contact with and closes the opening 20 of the partition wall 19 and opens the exhaust port 22 formed above the branch pipe 16. On the other hand, when descending, the opening 20 is opened and the exhaust port 22 is opened. Closure takes place. Then, the projection material receiving portion 18
The hopper 21 of the projection material S is located above the
When the valve 23 of the compressed air pipe 15 is opened, the compressed air is supplied to the branch pipe 16 and the mixing chamber 14, and the compressed air that has entered the branch pipe 16 enters the inside of the on-off valve 17 and raises it to open the opening 20. Then, the exhaust port 22 is opened. As a result, the flow of the shot material S in the hopper 21 into the pressurized tank 13 is stopped, and compressed air is discharged into the pressurized tank 13 through the exhaust port 22. The pressure balance of is maintained.

Then, when a regulating valve (not shown) provided at the connecting portion between the pressure tank 13 and the mixing chamber 14 is opened, the shot material S in the pressure tank 13 flows down into the mixing chamber 14 and the compressed air pipe. Hose 1 is mixed with the compressed air from 15.
2 is pressure-fed to the nozzle main body 11 and sprayed from the tip thereof to the work in the projection chamber 8 to perform blasting, and the blast material S and dust generated after blasting are treated in the same manner as described above. Then, when the blast material S in the pressurizing tank 13 decreases, when the valve 23 is closed to stop the supply of the compressed air, the opening / closing valve 17 descends to open the opening 20, and the blast material S in the hopper 21 is removed. Replenishment is performed by flowing down into the pressurized tank 13 via the projectile receiving portion 18, and when replenishment is completed, the valve 23 is opened and the opening / closing valve 17 closes the opening 20 to continue the scouring work.

As described above, as the air blast system of the air blast device, there are the gravity projection system and the pressure projection system as described above. In the latter pressure projection system, the blast material S is high pressure compressed air and the nozzle body 11 is used. Since they are pumped up to each other and jet together by accelerating from the tip, they are capable of stronger grinding and sweeping than the gravity projection type and have excellent grinding and sweeping power and high polishing efficiency, but the structure is slightly complicated. Since the nozzle wears quickly and becomes expensive, the gravity projection type and the pressure projection type are appropriately selected and used according to the purpose of use and the like.

[0006]

However, the size,
The processing capacity is different when it is necessary to perform the blasting treatment of various kinds of workpieces with different shapes, materials, blasting purposes, etc. Since the gravity blast type and the pressure blast type air blasting devices are installed and treated respectively, the air that is composed of the projection chamber, the collection device, the hopper (pressurization tank) for the projection material, and the dust collecting device as one set Since a plurality of sets of blast devices are installed, there is a problem that a large installation area is required and the equipment cost is increased.

[0007]

In the air blasting device of the present invention which has solved the above-mentioned problems, a dust collecting device is connected to a projection chamber for performing a blasting work by an air blast nozzle via a projection material collecting device. In the air blasting device, the hopper for storing the recovered blast material is connected to the recovery device, and the blast material at the bottom of the hopper has the discharge end facing the blast material receiving portion of the pressure tank installed below the hopper. A pipe for discharge is continued, and a tubular connection part and an opening / closing device for the projection material flow path are sequentially provided in the middle part of the conduit, and the projection chamber is connected to the pressure tank via a hose. An air blast nozzle for pressure projection and an air blast nozzle for gravity projection connected to a branch port of the conduit via a hose are arranged.

[0008]

Embodiments of the present invention will now be described in detail with reference to the drawings. The same parts as those of the conventional example are designated by the same reference numerals and the description thereof will be omitted. In FIG. 1, a collection pipe 9 is arranged in the vertical direction at the side of the projection chamber 8, and the tip of the collection pipe 9 is dust-containing containing the projection material collected to the upper side of the tubular body 25 of the collection device 24. The lower part of the tubular body 25 is conical in shape so that the air flow can be supplied in a tangential direction, and the discharge port 26 at the lower end is connected to the lower part of the recovery device 24 to the upper opening 28 of the hopper 27 for storing the recovered projection material. Therefore, the hopper 27 can accommodate the projection material S sent from the recovery device 24.

The hopper 27 for storing the collected projection material is shown in FIG.
As shown in FIG. 3, the upper conduit 3 has a lower opening 29 and a lower end thereof through an opening / closing device 35 for discharging the projection material.
0a and the lower conduit 30b are attached to each other to form a common blast material passage 31. And
The discharge end 32 of the lower conduit 30b is located at the side of the projection chamber 8 and is a projection material receiving portion 1 above the pressure tank 13 for pressure projection.
8 and a tubular connecting portion 33 is provided on one side of the upper conduit 30a with its tip facing the projection material passage 31, and the other end of the tubular connecting portion 33 has the other end. Nozzle body 2 of gravity blasting air blast nozzle 1 facing inside 8 is connected to the base end of hose 4 connected to the tip. Further, a tip opening of a suction pipe 34 for the secondary air held in the upper conduit 30a is located at the end of the tubular connecting portion 33 facing the projection material flow path 31, and the other end opening is the upper conduit 30a. It is located outside and can be opened and closed by a plug (not shown).

At the boundary between the upper conduit 30a and the lower conduit 30b on the lower side of the tubular connecting portion 33, the opening / closing device for opening / closing the blast material flow path 3 to switch outflow / stop of the blast material S. 35 is provided. This has an upper guide plate 36 horizontally fitted and fixed to the lower end of the conduit 30a, and a predetermined gap is provided below the upper guide plate 36 so that the lower guide plate 37 is fixed and held in parallel by bolts or the like. The lower guide plate 37 has a lower conduit 30b held concentrically with the upper conduit 30a with its upper end inserted and fixed.
0 is formed. An opening / closing plate 38 having a hole 39 having a size corresponding to the inner diameter of the conduit 30 is slidably inserted into the gap formed between the upper guide plate 36 and the lower guide plate 37. . Sealing members 40, 40 made of elastic members or the like are provided on the surfaces of the upper guide plate 36 and the lower guide plate 37 facing the opening / closing plate 38, respectively.
In the figure, 41 is a handle of the opening / closing plate 38, 42, 42
Is a positioning stopper attached to a predetermined position on the lower surface of the lower guide plate 37.

On the other hand, an outlet pipe 43 is erected on the top wall of the above-mentioned collecting device 24, and the outlet pipe 43 is connected to the dust airflow inlet portion 46 of the dust collecting device 45 via the duct 44. . In the drawing, 47 is an exhaust fan, 48 is a work placement turntable installed in the projection chamber 8, 49 is a support leg of the hopper 27, and 50 is a main pipe of compressed air connected to a compressed air source.

[0012]

Next, the operation of this embodiment will be described. First, in the case of blasting with a gravity projection type air blast device, the opening / closing plate 38 of the opening / closing device 35 is slid to the left side from the position of FIG. 2 by the handle 41, and the hole 39 is set as the chain line position of FIG. The flow path 31 is closed to stop the flow of the shot material S to the pressure tank 13 side, and the outer end of the suction pipe 34 is opened. Next, the work is placed on the turntable 48 to operate the dust collecting device 45 and the valve 7
When is opened, compressed air is supplied to the nozzle body 2 of the gravity blast air blast nozzle 1 through the main pipe 50 and the compressed air pipe 3. As a result, similarly to the above, the projection material S in the hopper 27 is
Is sucked from the tubular connecting portion 33 together with the suction airflow from the suction pipe 34, enters the nozzle body 2 of the air blast nozzle 1 for gravity projection through the hose 4, and is accelerated and jetted from the tip to clean the workpiece. Is done.

The dust particles generated from the blast material S and burrs after the blasting are introduced into the upper part of the collecting device 24 from the collecting pipe 9 as a dust-containing air stream by the suction action of the dust collecting device 45, and then inside the cylindrical body 25. Turn down. During this time, the shot material S separates from the dust-containing air stream and falls, passes through the discharge port 26, the upper opening 28 and the lower opening 29 of the hopper 27, passes through the shot material flow path 31, and falls and accumulates on the opening / closing plate 38. These are again tubular connections 3
3 is sucked and returned to the nozzle body 2 of the gravity blasting air blast nozzle 1, and the scouring work is continuously performed. On the other hand, the dust-containing airflow from which the blast material S has been separated is sucked out from the outlet pipe 43, introduced into the dust collector 45 through the duct 44 and the inlet portion 46, and dust is removed. After finishing the cleaning in this way,
The valve 7 is closed, the work is taken out, and the dust collector 45 is stopped.

Next, when using as a pressure projection type air blast device, the outer end of the suction tube 34 is closed by a plug, the opening / closing plate 38 is set to the position shown in FIG.
Thus, the upper and lower blast material passages 31 are communicated with each other to bring the blast material S into an outflow state. Next, after the dust collector 45 is operated and the valve 23 is opened, the compressed air flows from the main pipe 50, the compressed air pipe 15 to the branch pipe 16 of the pressurized tank 13 and the mixing chamber 1.
Inflow to 4. As a result, similarly to the above, the shot material S is pressure-fed by the compressed air through the hose 12, jetted from the nozzle body 11 of the pressure projection type blast nozzle 10, and the work is ground and cleaned. The blast material S and the generated dust are processed in the same manner as described above, and the blast material S collected is collected by the hopper 27.
From the lower opening 29 through the hole 39 into the blast material passage 31, is discharged from the discharge end 32 of the conduit 30b to the blast material receiving portion 18 of the pressure tank 13, and is recovered by operating the valve 23 as described above. The blasted material S thus prepared is replenished into the pressure tank 13 and reused.

Now, as a case where the die casting die is reprocessed by the device of the present invention having both the functions of the gravity projection type air blast system and the pressure projection type air blast system, first, the valve 23 is opened to apply. Impurities adhering to the die surface are swiftly and efficiently removed by the pressure projection type air blast nozzle 10, and then the valve 23 is closed and the opening / closing device 35 closes the projection material passage 31 to pressurize the tank 1.
When the flow of the shot material S to the No. 3 was stopped and the valve 7 was opened to switch to the blasting by the gravity blast type air blast nozzle 1, the surface was swept by the pressure blast type air blast nozzle 10. Air blasting can be performed on the surface of the mold with the gravity projection type air blast nozzle 1 to reduce the projection strength and avoid unnecessary polishing of the surface of the mold to prevent wear, which is extremely effective and economical. After the treatment, an excellent regenerated surface of the mold could be easily obtained.

In the above embodiment, the pressure tank 13 is used.
It is assumed that only one unit is provided, but if a double-chamber type pressure tank in which pressure tanks of the same structure are connected vertically is used, the projection material can be replenished while continuing the scouring work. In addition, it is more preferable for safety to provide an interlock between the opening and closing operations of both valves of the compressed air pipe 15 so as to prevent a mistaken operation between the gravity projection operation and the pressure projection operation.

[0017]

As is apparent from the above description, the present invention can switch the air blast system between the gravity projection system and the pressure projection system, which differ in the degree of blasting, by performing a simple operation. When it is necessary to increase or decrease the projection intensity or change the processing level due to the change of the type or the trial production, it is very convenient to deal with this, and moreover, the projection chamber for performing both types of air blasting work. And recovery equipment,
Since the dust collector is shared and only one set is required, the installation area is small, and the switching mechanism is simple and inexpensive to manufacture, providing high quality,
There are many advantages such as being suitable for multipurpose cleaning work.
Therefore, the present invention contributes to the industry as a solution to the problems of the conventional air blasting apparatus, and is extremely large.

[Brief description of drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a partially cutaway front view of the opening / closing device for the projection material flow path according to the embodiment of the present invention.

FIG. 3 is a cross-sectional plan view of an opening / closing device for a projection material flow path according to an embodiment of the present invention.

FIG. 4 is a partially cutaway front view of a conventional gravity projection type air blasting device.

FIG. 5 is a partially cutaway front view of a conventional pressure projection type air blasting device.

[Explanation of symbols]

 1 Air Blast Nozzle Nozzle for Gravity Projection 4 Hose 8 Projection Chamber 10 Air Blast Nozzle for Pressurizing Projection 12 Hose 13 Pressurized Tank 18 Projection Material Receiver 24 Recovery Device 27 Hopper for Collecting Recovery Projection Material 30 Conduit 32 Discharge End 33 Tubular Connection part 35 Opening / closing device for projection material flow path 45 Dust collector

Claims (1)

[Claims] 1. An air blasting device in which a dust collection device (45) is connected to a projection chamber (8) through a projection material recovery device (24), and the recovery device (24) is used for storing recovered projection materials. Hopper (27)
The hopper (27) is continuously connected to the bottom of the hopper (27), and the projection material receiving portion (18) of the pressurizing tank (13) installed below the hopper (27) has a discharge end (32) facing the discharge material (32). ) Are continuously provided with a tubular connection part (33) and an opening / closing device (35) for the projection material flow path in the middle part of the conduit (30), and the pressure tank is provided in the projection chamber (8). An air blast nozzle (10) for pressure projection connected to (13) via a hose (12), and a hose to the tubular connection part (33) of the conduit (30).
(4) Air blast nozzle for gravity projection connected via
(1) An air blasting device characterized in that and are arranged.