JPH0613840Y2 - Abrasive feeder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to an abrasive feeding device in an abrasive jet cutting machine.

[Prior Art] Stable supply of an abrasive material into a water jet in an abrasive jet cutting machine is important for stabilizing the cutting ability.

The applicant of the present application has previously proposed in Japanese Utility Model Application Laid-Open No. 60-36154 a device (self-priming system) for supplying and mixing an abrasive material by utilizing an ejector effect generated at the time of jetting a water jet. This has an effect that a pneumatic pressure source for transfer is not required and no special control is required.

However, when cutting with the above-mentioned abrasive jet device, it was necessary to lengthen the abrasive hose to some extent for reasons such as work safety and the radius of action of the abrasive head. However, if the abrasive hose becomes too long, the suction of the abrasive becomes unstable.Therefore, in order to compensate for this, it is necessary to dispose the abrasive supply hopper in the vicinity of the nozzle and at a place that does not hinder the movement of the nozzle. As such a place, it was inevitable that the abrasive supply hopper was arranged and used above the nozzle.

FIG. 5 is an explanatory view showing the configuration of such a conventional example. In the figure, the abrasive feed hopper 1 has a closing valve 2 at the bottom outlet, and the outlet of the valve 2 is the abrasive material from the feed hopper 1. It is communicated with the upper end of the abrasive hose 4 together with an air amount adjusting valve 3 for adjusting the amount of air mixed in. The lower end of the abrading hose 4 is connected to an abrading head 5, and the abrading material 7 in the abrading hose 4 is sucked by the ejecting action of the high-pressure jet water flow inside the abrading head 5 to produce an abrading nozzle. 6, the abrasive material 7 is jetted together with the high-pressure jet water.

6A and 6B are explanatory views showing the behavior of the abrasive material 7 in the abrasive hose 4.

The same reference numerals in the drawings indicate the same or corresponding parts.

[Problems to be Solved by the Invention] However, as shown in FIG. 6A, in the above method, there is no problem during continuous feeding, but the abrasive material 7 used for cutting is occluded when pressed. When the water jet is stopped (6th
As shown in Fig. B), the abrasive material 7 remaining in the abrasive hose 4 is pressed and wetted in the vicinity of the mixer (not shown) and the abrasive nozzle 6 in the abrasive head 5, and subsequently jets a water jet. Even so, the abrasive material 7 does not flow and becomes clogged.

In this state, it is naturally impossible to cut, so for a while after the closing valve 2 at the lower part of the abrasive feed hopper 1 is closed, the abrasive material 7 remaining in the abrasive hose 4 by idling is completely ejected. Had been discharged. Performing such an idle injection causes loss of abrasive material and time by itself, and at the start of the next cutting, the hose is empty and the water jet is injected before the abrasive is injected from the nozzle. There was a time delay before it was done, and there was a time loss here as well.

Therefore, an object of the present invention is to obtain an abrasive supply device in which the abrasive material remaining in the abrasive hose is not pressed into the abrasive head.

[Means for Solving the Problems] An abrasive supply device according to the present invention is provided with a piping member communicating with an abrasive nozzle in an abrasive head having an ejector effect, and arranged above the abrasive head. In an abrasive feeding device for connecting with an abrasive feeding hopper, an obstruction prevention tank that constitutes an up-and-down bent flow path is provided between the abrasive inlet portion of the abrasive head and the piping member. .

[Operation] The basic principle of the present invention is that if the abrasive supply pipe member has upper and lower bent portions in the vicinity of the abrasive inlet of the abrasive head, when the water jet is stopped, the The remaining abradable material is pressed into the concave portion of the bent portion, and therefore is not pressed into the abrasive head downstream thereof.

Therefore, instead of the bent portion, an inlet portion communicated with the abrasive hose in an upper portion of the sealed container, an outlet portion communicated with the abrasive inlet of the abrasive head, and the sealed container Even when a blockage prevention tank equipped with a vertical bending path leading from the inlet to the outlet is installed inside, when the water jet is stopped, the abrasive material remaining in the abrasive hose is compressed into the blockage prevention tank. And therefore does not press into the abrasive head downstream. That is, the up-down bent portion and the tank serve as a small hopper arranged immediately in front of the nozzle head, and at the same time, they serve to separate the abrasive material from the nozzle when stopped. Therefore, since the abrasive does not remain in the abrading head, the head is not clogged due to its wetting, and when the cutting is resumed, suction of the abrasive material to the head is immediately resumed to prevent the ejection delay.

[Embodiment] FIG. 1 is an explanatory view showing the basic concept of the present invention, and FIGS. 2A and 2B are explanatory views showing the behavior of the abrasive material 7 in the abrasive hose 4 in FIG. Is.
In the figure, 8 is a bent portion.

FIG. 2A shows the behavior of the abrasive material 7 in the abrasive hose 4 during continuous feeding, and FIG. 2B shows the behavior of the abrasive hose 4 when the water jet is stopped.
The behavior of the abrasive material 7 remaining inside is shown. As shown in the figure, the abrasive material 7 in the abrasive hose 4 has a bent portion 8
It is pressed into the concave portion of the above, and is not pressed into the abrasive head 5. That is, the concave portion of the bent portion has the same function as the abrasive material supply hopper arranged immediately before the nozzle, and has the same function as the distance between the nozzle and the abrasive material supply hopper is shortened.

The present invention is provided with an upward bending portion 8 to the extent that the abrasive material 7 remaining in the abrasive hose 4 is compressed, and the ejecting effect of the abrasive head 5 causes the compression to be released. As long as it can be obtained, as an example, the anti-closure tank 9 made of wear-resistant metal is shown in FIG.
FIG. In the figure, the blockage prevention tank 9 has an inlet portion 10 communicating with the abrasive hose 4 at one of the upper portions,
Similarly, the other upper portion is provided with an outlet portion 11 communicating with the abrasive inlet of the abrasive head 5. In the tank 9, a vertical bent portion path 12 is formed between an inlet portion 10 and an outlet portion 11.

[Advantages of the Invention] As described above, the present invention has the blockage prevention tank with the upper and lower bent portions or the route of the upper and lower bent portions in the abrasive supply pipe in the vicinity of the abrasive inlet of the abrasive head. Since the abrasive material remaining in the abrasive hose is pressed immediately before the abrasive head, it does not accumulate in the head, and in order to completely discharge the abrasive material remaining in the abrasive hose when the machine is stopped. There is no need to perform idle injection for a while after closing the closing valve at the bottom of the abrasive supply hopper. Also, at the start of cutting, the abrasive material waits until immediately before the head, so the time delay from the start of high-pressure water injection to the injection by suction of the abrasive material can be minimized, resulting in a machining cycle time. There is an effect that can also contribute to the shortening of

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the basic concept of the present invention, FIGS. 2A and 2B are explanatory diagrams showing the behavior of the abrasive material in the hose in FIG. 1, and FIG. 3 is a basic diagram of the present invention. FIG. 4 is an explanatory view showing the structure of the concept, FIG. 4 is an explanatory view showing the structure of an embodiment of the present invention, FIG. 5 is an explanatory view showing the structure of a conventional feeder, and FIGS. 6A and 6B are inside a conventional hose. It is explanatory drawing which shows the behavior of the abrasive material of FIG. In the figure, 1 is a supply hopper, 2 is a closing valve, 3 is an air amount adjusting valve, 4 is an abrasive hose, 5 is an abrasive head, 6 is an abrasive nozzle, 7 is an abrasive material, and 8 is a bent portion. Is. The same reference numerals in the drawings indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] 1. An abrasive supply device in which a pipe member communicating with an abrasive nozzle in an abrasive head having an ejector effect is connected to an abrasive supply hopper, wherein an abrasive inlet portion of the abrasive head and the pipe. An abrasive supply device comprising a blocking prevention tank that forms an up-and-down bending flow path between the member and the member.