JP5495269B2 - Shot blaster jet structure - Google Patents

Description

  The present invention relates to a shot blaster jetting structure in which a blasting material is projected (jetted) to engrave characters and pictures on a blasting body or to remove dirt.

  The cost of engraving letters on the surface of graves and tombstones is cheaper to work onsite than to take them back to the factory. In particular, in the case of grave magazines, most of the cases are carried out locally because letters are added to the stone plates already built in the grave. This engraving work is impossible with a rotating tool or the like, and is based on a shot blaster that ejects a blast material made of gold sand or beads. The reason why shot blasters are used is that they are not too big, and beautiful letters can be engraved quickly.

  Shot blasting here means storing blasting material in a tank, connecting a blasting hose to the bottom of the tank and discharging blasting material, and supplying pressurized air to the tank and blasting hose to mix this blasting material. Pressure air (blast wind) is ejected toward the blasting body. If the blasting material is sprayed directly onto the tomb magazine (blasted body), the object cannot be seen well with dust, and the working environment is also deteriorated. Covering, blasting material is ejected in this work box, and the generated dust is sucked by a blower or the like.

  In this case, it is necessary to adjust the mixing amount of the blasting material related to the blasting force, and to adjust the blasting air volume related to the blasting width such as the character width. FIG. 5 is a front view of the main part of a conventional example showing this structure, and FIG. 4 is a circuit diagram thereof. A discharge pipe 2 for discharging the blast material is provided vertically at the lower part of the tank 1 for storing the blast material. A blast valve 3 for adjusting the discharge amount (mixing amount) of the blast material is attached to the pipe 2. In this case, since the blast valve 3 is made of metal and is immediately worn out by the blast material, a diaphragm valve that causes two convex rubber films to face each other and the blast material to fall like an hourglass between the rubber films is provided. Used. And the fall amount of a blast material is adjusted by adjusting the space | interval of a rubber film.

  Further, the cheese (T-shaped joint) 4 is connected horizontally to the lower part of the discharge pipe 2, pressure air is fed from one side of the cheese 4, and the blast hose 5 is connected to the other side of the cheese 4. The material was put on the pressure air and sent to the blast hose 5. In this case, the air volume of the blast wind was adjusted by the on-off valve 7 provided in the air supply pipe 6 supplied to the cheese 4. However, since the blast valve 3 and the on-off valve 7 are provided beside the tank 1, if they are away from the work place, they must go to the tank 1 every time they are adjusted, reducing work efficiency. It was.

  Furthermore, since the pressurized air generated by the compressor or the like contains moisture, it sticks to the blast material dropped on the cheese 4 and clogs as a lump. Therefore, the present inventors have proposed the following Patent Document 1, in which the blast material once dropped on the main cylinder is transferred to the sub cylinder through a communication pipe inclined downward from the horizontal, and this is compressed air. It squirts on board. And the discharge amount of a blast material is adjusted by changing the angle of this communicating pipe. Therefore, the mixing amount of the blasting material can be finely adjusted, and the blasting material is sequentially changed in position, so that the moisture in the pressure air is difficult to stick to the blasting material and hardly forms a lump.

JP 2010-94745 A

  The present invention solves the above-mentioned problems, prevents the blasting material that has fallen on the cheese from clumping and stops and makes it difficult to clog, and also adjusts the mixing amount of the blasting material and the blasting air volume. The work efficiency is improved by being able to do it by the box.

  Under the above problems, the present invention provides a blasting process from a blast hose connected to a discharge pipe provided at a lower portion of the tank by supplying pressurized air to a tank for storing the blast material according to claim 1. In the shot blaster jet structure that jets toward the body, an L-shaped jet amount adjustment pipe whose outlet side is inclined upward is connected to the discharge pipe, and an elbow, cheese, and a blast hose are vertically connected to the jet quantity adjustment pipe. In addition to providing a jet structure of a shot blaster, characterized in that pressurized air is supplied from a side-facing connection port of cheese, the outlet side of the jet amount adjusting pipe according to claim 2 is vertical. Means are provided with a forward slope of approximately 80 ° relative to the inlet side.

  Further, according to the present invention, in the jet structure of the shot blaster described above, an opening / closing valve is provided in an air supply pipe for supplying pressurized air to the cheese connection port according to claim 3, A means capable of adjusting the amount of mixing and the amount of blast air, wherein the needle valve for adjusting the flow rate is provided in the air supply pipe upstream of the on-off valve according to claim 4, and the needle valve is provided close to a work box covering the blasting body. The pressure air for pressurizing the tank and the pressure air supplied to the cheese are supplied from the same pressure air generation source, and the air supply pipe is supplied with the pressure air downstream of the needle valve. A means is provided in which a first air supply pipe to be sent to a tank and a second air supply pipe to be sent to cheese are branched, and a short-circuit pipe for short-circuiting both air supply pipes is provided between the first air supply pipe and the second air supply pipe.

  According to the first aspect of the present invention, the outlet side of the ejection amount adjusting pipe is inclined upward from the horizontal, so that the blast material does not drop to the elbow (blast hose) side without limit due to the pressurization in the tank. The amount of fall can be accurately controlled by the volume of pressurized air to be pressurized. In addition, since the blasting material has frictional resistance, when the pressurization in the tank is stopped due to the stoppage of work, etc., the accumulated state is maintained in the ejection amount adjusting pipe, and a special closing valve is required. do not do. Furthermore, since the path from the elbow to the cheese is formed vertically, even if moisture is contained in the pressure air, it quickly falls to the blast hose side and does not accumulate and become a lump (clog).

  According to the means of claim 3, the mixing amount of the blasting material and the air volume of the blast air can be adjusted simultaneously by the opening degree of the on-off valve provided in the air supply pipe. According to the means of claim 4, the air volume of the blast air can be adjusted by the operator. Can finely adjust while looking into the work box (it does not have to go to the side of the tank), and the work need not be interrupted. According to the means of claim 5, it is possible to quickly remove the pressurized air in the tank, which is necessary when the work is stopped.

It is a partial cross section figure which shows the state of the tank lower part which concerns on this invention. It is sectional drawing which shows the structure of a needle valve. It is a circuit diagram of the air flow path which concerns on this invention. It is a circuit diagram of the air flow path of a prior art example. It is a partial front view of the principal part which shows the state of the tank lower part of a prior art example.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. For comparison, a conventional shot brass air circuit will be described with reference to FIG. 4 (the same reference numerals are used for the same members as above). A blast material is stored in the tank 1 (not shown), and a discharge pipe 8 communicating with the atmosphere is provided at an upper portion of the tank 1 through an on-off valve 9. A discharge pipe 2 for discharging the blast material is attached to the lower part of the tank 1 via a blast valve 3, and a blast hose 5 having a nozzle 10 attached to the tip is connected to the discharge pipe 2. Then, the high pressure air pressurized by the compressor or the like is sent through the air feed pipe 6 via the on-off valve 7 and the air filter 11, and the second air going to the first air feed pipe 12 and the blast hose 5 going to the tank 1 side. The gas is branched into the air supply pipe 13 and supplied to each.

  With the above configuration, when pressurized air is supplied from the air supply pipe 6 to the tank 1 and the blast hose 5, the pressure air causes the blast material stored in the tank 1 to be discharged from the discharge pipe 2 to the blast hose 5 and ejected from the nozzle 10. . In this case, as described above, the mixing amount of the blasting material is adjusted by adjusting the blast valve 3 and the blasting air volume is adjusted by the on-off valve 7. According to this, in order to adjust the mixing amount and the air volume, it is necessary to operate both the blast valve 3 and the on-off valve 7, and since this is provided beside the tank 1, it is to be operated. As mentioned above, you have to go so far.

  Therefore, the present invention has been proposed, and its circuit diagram is shown in FIG. In the present invention, first, the opening / closing valve 14 and the needle valve 15 are inserted in series from the upstream side of the air supply pipe 6 connected to a compressor or the like (not shown), and the first air supply pipe 12 and the second air supply pipe are downstream thereof. 13 and a short-circuit tube 16 for short-circuiting them. On the other hand, a work box 18 is attached to the blasting body 17, and the blast hose 5 and the nozzle 10 are inserted through the insertion port 19, and high-pressure air mixed with blasting material (blasting) from the nozzle 10 while looking through the viewing window 20 thereabove. The air is blown onto the blasting body 17 to perform the character engraving work.

  In the present invention, the air supply pipe 6 is formed of a rigid pipe or the like, and this is led to a position where the operator's hand can reach near the work box 18 (may be attached to the work box 18). The needle valve 15 is provided at the location where it is installed. In this case, as shown in the cross-sectional view of FIG. 2, the needle valve 15 is formed with a related hole 22 in the flow passage 21 formed in the main body, and a needle 23 having a tapered tip is inserted into the related hole 22. The flow rate can be adjusted by the amount of rush, and it can be finely adjusted.

  Further, an ejection amount adjusting pipe (hereinafter referred to as an adjusting pipe) 24 for adjusting the mixing amount of the blasting material and the blasting air volume at the same time is attached to the lower part of the discharge pipe 2 of the tank 1, and an elbow (L-shaped) is attached to the adjusting pipe 24. Joint) 25, cheese 4 and blast hose 5 are connected. FIG. 1 is a cross-sectional view of the main part showing the adjustment pipe 24. The adjustment pipe 24 is an L-shaped one whose outlet side is inclined upwardly about 80 ° from the inlet side. 25 and cheese 4 are connected, and a blast hose 5 is connected to the cheese 4. According to this configuration, the cheese 4 and the blast hose 5 are formed vertically. In addition, the second air supply pipe 13 is connected to the connection port 26 facing the center of the cheese 4 via the on-off valve 26.

  According to the above configuration, the blasting material of the tank 1 is pushed to the outlet side of the adjusting pipe 24 by the pressurized air from the first air supply pipe 12, and when it hits the elbow 25, it falls like sand in the hourglass, Supplied to the blast hose 5. The blasting material that has fallen from the cheese 4 becomes blasted by the pressure air of the tank 1 that flows in from the connection port 26 and is sent to the blast hose 5. The amount of blasting material at this time (the amount of blasting airflow) M) depends on the opening degree of the on-off valve 14 or the needle valve 15 provided in the air supply pipe 6. That is, the amount of mixing increases as the amount of pressurized air increases.

  In actual work, the on-off valve 9 is closed and the on-off valve 27 of the second air supply pipe 13 is opened, and the on-off valve 14 and the needle valve 15 of the air supply pipe 6 are opened to send pressurized air from the air supply pipe 6 to the first air supply pipe 12. And supplied to the second air pipe 13. At this time, if the on-off valve 27 is fully opened, the amount of pressurized air going from the first air supply pipe 12 to the tank 1 is small due to the pressurized load of the blast material, and the blast material is not sufficiently discharged. Therefore, if the on-off valve 27 is gradually throttled to relatively increase the amount of pressure air that goes to the tank 1, the amount of blasting material increases, so the on-off valve 27 is fixed at an opening degree that exhibits the maximum blasting force. Keep it.

  In addition, although pressure air flows in into the cheese 4 from the 2nd air supply pipe | tube 13, since the pressure air from the tank 1 supplied from the 1st air supply pipe | tube 12 also flows into the cheese 4 from the 2nd air supply pipe | tube 13, it is cheese 4. There is a question that the pressure air that has flowed into the tank flows back from the discharge pipe 2 to the tank 1 and the blasting material does not sufficiently fall into the elbow 25. However, since the pressure of the tank 1 is static pressure, the pressure air flowing into the cheese 4 is dynamic pressure accompanied by movement, and since the static pressure is higher than the dynamic pressure, it does not flow backward. However, the pressure air from the second air supply pipe 13 has an effect of increasing the speed of the blast wind flowing through the blast hose 5.

  Then, when the character width or the like is different and it is necessary to adjust the blast air volume, the needle valve 15 is adjusted. If the opening is opened, the blast flow will increase, and if it is throttled, it will decrease. However, in this case, the mixing amount of the blasting material will not change in principle (the maximum blasting force is still exhibited). Since the needle valve 15 is provided near the work box 18, the blast air volume can be adjusted while working (so-called remote operation is possible), and work efficiency is not lowered.

  When the work is completed, the on-off valve 7 is closed and the on-off valve 9 is opened. At this time, the on-off valve 9 is attached to the tank 1 and may be away from the work place. However, in this example, since the above-described short-circuit tube 15 is provided, when the on-off valve 7 (the same applies to the needle valve 15) is closed, the pressure air in the tank 1 quickly escapes to the blast hose 5 and exists therein. The blasting material to be discharged is discharged (the trouble of closing the on-off valve 9 can be saved).

  When the work is temporarily stopped or completely finished, the blast material accumulated in the adjustment pipe 24 is stopped without breaking the shape of the slope with the bottom surface projecting to the elbow 25 side, and is discharged wastefully. There is nothing. The reason seems to be that the shape is maintained because the upward inclination of the outlet side of the adjusting pipe 24, the friction resistance of the blast material, and the inside of the tank 1 becomes negative pressure when discharged. Therefore, it can be carried as it is without requiring any particular closing valve.

DESCRIPTION OF SYMBOLS 1 Tank 2 Discharge pipe 3 Open / close valve 4 Cheese 5 Blast hose 6 Air supply pipe 7 Open / close valve 8 Release pipe 9 Open / close valve 10 Nozzle 11 Air filter 12 First air supply pipe 13 Second air supply pipe 14 Open / close valve 15 Needle valve 16 Short-circuit pipe 17 Blasting body 18 Work box 18 Insertion port 20 Peeping window 21 Channel 22 Passage hole 23 Needle 24 Ejection amount adjustment pipe 25 Elbow 26 Cheese connection port 27 Open / close valve

Claims (5)

  In a shot blaster jetting structure that supplies pressurized air to a tank for storing blasting material and jets the blasting material from a blast hose connected to a discharge pipe provided at the bottom of the tank toward the blasting body, the outlet to the discharge pipe Connect an L-shaped jet amount adjustment pipe whose side is inclined upward, connect an elbow, cheese, and blast hose vertically to the jet amount adjustment pipe, and supply pressurized air from the connection port facing the side of the cheese. Characteristic shot blaster spray structure.   The jet structure of a shot blaster according to claim 1, wherein the outlet side of the jet amount adjusting pipe has a forwardly rising gradient of about 80 ° with respect to the vertical inlet side.   3. The shot blaster ejection structure according to claim 1 or 2, wherein an opening / closing valve is provided in an air supply pipe for supplying pressurized air to a cheese connection port, and a mixing amount of the blast material and an air volume of the blasting air are adjusted by an opening degree of the opening / closing valve.   4. The shot blaster ejection structure according to claim 3, wherein a needle valve for adjusting a flow rate is provided in an air supply pipe upstream of the on-off valve, and the needle valve is provided in the vicinity of a work box that covers the blasting body.   The pressure air that pressurizes the tank and the pressure air that is supplied to the cheese are supplied from the same pressure air source, and the air supply pipe is sent to the first air supply pipe that sends the pressure air to the tank downstream of the needle valve and to the cheese. The shot blaster according to claim 4, wherein a short-circuit pipe is provided for branching into two air supply pipes and short-circuiting both air supply pipes between the first air supply pipe and the second air supply pipe.