JPS5924863B2 - Additive injection device for spraying method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for press-injecting additives such as a setting accelerator and water, which is arranged near the nozzle of a conveying hose for mortar, etc., in a mortar spraying method.

As shown in FIG. 1, the conventional addition press-fitting device consists of a water ring 2 having a plurality of discharge holes 1 opening on its inner circumferential surface, and a water ring main body 3 that fits into the outer circumferential surface of this water ring 2. It was something like that.

When using this press-fitting device, this device is placed between the couplings 4 and 4, and the additive is mixed into the main material such as mortar flowing through the conveying hose 5 by force-feeding it through the discharge hole 1. was. However, in this device, the discharge hole is easily clogged with mortar, etc., and once clogged, it takes time to repair the discharge hole because it is narrow. Also, since there was no check valve, it was impossible to stop the supply of additives until the main material had been stopped under pressure. The present invention
This is an improvement over the drawbacks of the conventional device described above.

The addition press-in device of the present invention will be explained with reference to the embodiment shown in FIG. 6, and a tubular liner support T that fits onto the outer peripheral surface of the rubber liner. One end of the rubber liner 6 forms a flange 8, which locks onto the liner support 7. The liner support 7 has threaded portions 9 at both ends thereof to be screwed into the pair of couplings 4, 4, and a groove 10 formed in the circumferential direction on the inner peripheral surface at approximately the center thereof. An additive pressure-feeding pipe insertion port 11 that opens into the groove 10 is formed from the outer peripheral surface of the support. When using this addition press-fitting device, the device is attached to the conveying hose 5 using the couplings 4, 4 so that the flange portion 8 of the rubber liner 6 is located on the upstream side of the conveying hose 5.

After inserting the additive pressure-feeding pipe 12 into the pipe insertion port 11, when a chemical such as a setting accelerator or an additive such as water is pumped, the groove 10 is filled with the additive, and then the rubber liner 6 is inserted inside. Rubber liner 6 and liner support 7 while being bent
The additive is mixed into the mortar flow in the conveying hose through the gap 13 (exaggerated in the drawing) formed by the pressure of the additive. When the additive pumping is stopped, the restoring force of the rubber liner and the mortar flow press the rubber liner 6 toward the liner support, eliminating the gap 13, so that the mortar does not flow back into the additive pumping pipe. As is clear from the above description, since the device of the present invention discharges the additive using the gap, there is no mortar clogging unlike the conventional device which uses narrow discharge holes.

Furthermore, since the rubber liner 6 acts as a check valve, even if the pumping of the additive is stopped, the mainstream will not flow in. Therefore, it has excellent advantages such as being able to freely stop the pumping of the additive without stopping the main stream.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a conventional addition press-fitting device, and FIG. 2 is a longitudinal sectional view of the addition press-fitting device of the present invention. 1...Discharge hole, 2...Water ring, 3.
... Water ring head, 4 ... Coupling, 5 ... Transport hose, 6 ... Liner, 7 ... Liner support, 8 ...Flange, 9...Threaded portion, 10...Groove, 1
1...Additive pressure feeding pipe insertion port, 12...
...Additive pressure feeding pipe, 13...Gap.

Claims (1)

[Claims] 1. An additive press-in device consisting of a tubular liner made of an elastic or flexible material and having a flange formed at one end, and a liner support that is fitted onto the outer peripheral surface of the tubular liner and supports the tubular liner. At both ends of the liner support, threaded portions are formed to engage the pair of couplings, and grooves are formed in the inner circumferential direction at approximately the center, and from the grooves to the outer circumferential surface of the support. 1. An additive press-in device for a spraying method, characterized in that an additive press-in pipe insertion port that opens is formed.