JPS60141475A - Bluster machine - Google Patents

Abstract

PURPOSE:To achieve sufficient flying speed of sweeping material by arranging an air transporting tube having large diameter at the outercircumferential side of sweeping material transporting tube while providing a restricted nozzle at the leading edge thereby ejecting air with higher speed than predetermined level through nozzle even for low pressure supply air. CONSTITUTION:The air of relatively low pressure fed from an air feeder 3 through an air transportation tube 2 arranged at the outercircumferential side of sweeping material transporting tube 5 is restricted and accelerated at the restriced section 14 of nozzle 1 at the leading edge of said tube 2 to be ejected through the nozzle 1 with higher speed than predetermined level. Furthermore, restriction/acceleration of air at said section 14 will cause suction at the leading edge of said tube 5 opening to the restricting section 14. Because of the negative pressure, sweeping material is sucked from the leading edge 4 toward the nozzle 1 then ride on the air flow accelerated at the restricting section 14 and ejected to perform blusting.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a plastic machine used for removing scale from metal surfaces, forming a base on metal surfaces, deburring parts, and the like.

As shown in Fig. 1, a conventional plastic machine has an air jet tube (b) whose tip (a) is sharply constricted.
While relatively high-pressure (4 to 6 atmospheres) compressed air is supplied from the compressor to [It is configured so that the cleaning material (B) is carried by the air flow and sprayed from the nozzle (d) toward the object to be polished.

As mentioned above, conventional plastic blasting machines require a compressor that supplies high-pressure compressed air, but this requires a blowing air system with a wind speed of about 150 m/spool or higher from the nozzle (d). and air jet pipe (b)
This was because the tip (,) of the blower was rapidly constricted, and it was believed that the above-mentioned wind speed could not be achieved with a relatively low-pressure air supply device such as a fan or blower.

For this reason, conventional plastic machines require a compressor, which has the drawbacks of high equipment costs and an increased installation area. In addition, in order to cope with high pressure, the structure must be made strong, resulting in high cost and difficulty in making the structure lighter. Furthermore, the drain oil from the compressor is used for cleaning
In addition to this, there was also the drawback that it had a negative effect on the polishing surface of the M object.

The present invention aims to eliminate the various drawbacks of the above-mentioned conventional examples, and as illustrated in the illustrated embodiment, a nozzle (1) is provided at the tip.
The air conveying pipe (2) with high pressure is connected to the relatively low pressure air supply device (3), while the tip (4) is connected to the nozzle (1).
An abrasive material transport pipe (5) that opens into the constriction part (14) is disposed inside the air transport pipe (2), and this abrasive material transport pipe (5) is connected to the abrasive material supply device (6). An air supply section (7) is connected to the
) to configure the plastic machine.

The present invention will be specifically described below based on illustrated embodiments.

Figures 2 and 31 show an embodiment configured to carry out the blasting work in a cleaning cabinet (8);
are work gloves. The tip of an air conveying tube (2) made of a flexible hose is inserted into this cabinet (8). A nozzle (1) is attached to the tip of this air conveying pipe (2). On the other hand, the rear end of the air conveying pipe (2) is connected to a relatively low pressure air supply device (3) such as a Roots blower or a turbo fan.

An abrasive material conveying pipe (5) made of a flexible hose is disposed inside the air conveying pipe (2). Its tip (4) is I
It is aimed at the appropriate place in the constriction part (14) of the nozzle 1 described in II. This abrasive material conveyance pipe (5) has a rear part taken out from the air conveyance pipe (2) from the middle, and the rear end is connected to an abrasive material supply device (6) containing abrasive material such as sand. It is connected. In the illustrated example, the abrasive material supply device (6
).

Further, an air supply section (forced) consisting of a secondary air inlet pipe is provided downstream of the abrasive material supply device (6), and the supply amount of the abrasive material is adjusted by the supply amount adjustment valve (12). The structure is such that air from the atmosphere is mixed into the air.

The helmet (13) is a spacer member for supporting the abrasive material conveying pipe (5) at a predetermined position inside the air conveying pipe (2).

The following was manufactured as a trial plast machine with the above configuration.

Air flow f'6 device (3) 2 air volume 2y/min, pressure 3100
Turbofan air conveying pipe (2) of m Aq: Flexible hose nozzle (1
): Maximum inner diameter 25 mm, minimum inner diameter 12 mm, length 65 mm Abrasive material conveying pipe (5): Flexible hose with an inner diameter of 10 m. about 2
When sand adjusted to a speed of 0.00 m/min is supplied to the abrasive material conveying pipe (5) and secondary air is freely supplied from the air supply section (7), the air flow from the nozzle (1) is approximately 200 m/min.
It was confirmed that a jet flow containing sand of m 7 seconds was obtained, and that the same blasting work as the conventional one could be performed.

The present invention can be configured in various embodiments in addition to those shown in the above-mentioned examples. In the above embodiment, the tip (4) of the abrasive material conveying pipe (5) is opened slightly toward the rear of the constricted portion (14) of the nozzle (1), but the functions and effects of the present invention described later are The opening position of the tip (4) can be set at an appropriate location within the diaphragm (14) within the range in which the aperture is exerted.

Furthermore, the configuration of the air supply section (7) is of course not limited to that shown in the above embodiments, and any configuration may be used as long as the functions and effects of the present invention, which will be described later, are exhibited. is not asked. For example, the air supply section (7) may be configured with a pressurized air supply device having a flow rate greater than the amount of air supply, so that the abrasive material can be fed under pressure.

Since the present invention has the above configuration, it can perform the following functions. In other words, the air conveyance pipe (2) is arranged on the outer circumferential side of the abrasive material conveyance pipe (5) and is formed to have a larger diameter than the conventional one (this increases the flow rate of air in the air conveyance pipe (2)). ) and a moderate constriction part (
14), even if the air is supplied from the relatively low-pressure air supply device (3), when it is ejected from the nozzle (1), it has a predetermined value (for example, 1
Since a wind speed of 50 m/sec or more can be obtained and a sufficient flying speed of the abrasive material can be obtained, it is possible to perform the same blasting work as in the conventional method.

Also, 1) 'iI 4σ [Since the tip (4) of the sweeping conveyance pipe (5) opens into the constriction part (14) of the nozzle (1),
The air flowing through the air conveying pipe (2) is throttled and accelerated by the nozzle (1), and is subjected to the suction action of negative pressure. Due to this negative pressure, the abrasive material in the abrasive material conveying pipe (5) is sucked out from its tip (4) toward the nozzle (1), and then accelerated at the constriction part (14) of the nozzle (1). It rides on the airflow and blows out to the outside.

Furthermore, as stated in ``1'', the tip (4) of the abrasive material conveying pipe (5)
The abrasive material is sucked out, but at the same time, the air is also sucked out. If air is not replenished into the abrasive material conveyance pipe (5), there is a risk that negative pressure will develop inside the abrasive material conveyance pipe (5), and the abrasive material will not flow smoothly. Since the invention has an air supply section (7), the flow of the abrasive material can be made smooth.

Since the present invention has the above-described configuration and operation, it can achieve the following effects compared to the conventional example.

■ It is not necessary to use an expensive compressor that occupies a large area, which was essential in the conventional case, but instead, a relatively low-pressure air supply device such as a fan or blower can be used, resulting in a significant cost reduction. Not only can it be downsized, but it can also save installation space.

(2) Since a low-pressure structure is sufficient, the structure can be made simple and simple, and in this respect, costs can be reduced and weight can be reduced.

■ Fans, blowers, etc. can send dry air to the air conveying pipe, which solves the problems of conventional compressor drainage and oil, and improves the surface of the object to be polished. can do.

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a conventional example, FIG. 2 is a schematic diagram of an embodiment of the present invention, and FIG. 3 is a schematic vertical sectional view illustrating its principle. (1) --- Nozzle (2) --- Air conveying pipe (3
) --- Relatively low-pressure air supply device (4) -- One-to-one (5) -- One-to-one return material conveying pipe (6) --- Thin material supply device (7) -- One air supply Section (14)--First Selection Department Attorney Masaru Tsuchishihara Figure 1 Figure 3 Figure 2

Claims (1)

[Claims] (1) An air conveyance tube with a nozzle at its tip is connected to a relatively low-ratio air supply device, and an abrasive conveyance tube whose tip opens into the constriction of the nozzle is arranged inside the air conveyance tube. A plast machine is characterized in that the abrasive material conveyance pipe is connected to an abrasive material supply device, and an air supply section is further provided for replenishing air to the abrasive material conveyance pipe.