JP2009233598A - Dust splash prevention device in powder scattering apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a dust splash prevention device in a powder scattering apparatus which controls the amount of water as much as possible and which is capable of effectively controlling the dust splash by spraying water to form a mist curtain with no gap, which is not fanned by normal wind. <P>SOLUTION: The dust splash prevention device in the powder scattering apparatus has a structure that a ring type nozzle tube is fitted to the upper part of surrounding of a scattering mouth of a hopper to scatter a powdery solidifying material such as cement and the like from the scattering mouth at the under part and that a number of spray nozzles are fitted and arranged to the ring type nozzle tube towards the approximately lower part, and a cylindrical mist curtain is formed by spraying water without a gap on the surrounding of the scattering mouth from the spray nozzles so that the splash of dust dropping from the scattering mouth is prevented. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a dust scattering preventing device in a powder spraying device for spraying a powdery solidified material such as cement onto the surface of an improved ground.

As a dust scattering prevention device in a conventional powder spraying device, a spraying and stirring mixing machine that freely moves on the ground surface is provided with an injection nozzle, and the surface spraying and stirring mixing site is sprayed radially from the spray nozzle. In some cases, the dome-shaped water curtain is covered in a substantially hermetically sealed manner, while powder such as a solidified material is sprayed on the ground surface and the ground surface is stirred and mixed. (For example, see Patent Document 1)
Conventionally, there has been a dust dispensing device in which a ring nozzle having a large number of water injection holes for forming a water curtain is installed on the outer periphery of the lower end of a dust discharge chute for dropping dust. (For example, see Patent Document 2)

However, the conventional water curtain using the above-described injection nozzle and injection hole has a problem that not only the amount of water used is large but also the scattering of dust cannot be effectively prevented.
JP-A-7-150547 Japanese Utility Model Publication No. 62-43688

  The problem to be solved by the present invention is to form a mist curtain in which the amount of water is suppressed as much as possible by effectively arranging the spray nozzles, and to form a mist curtain without gaps without being damaged by normal wind. Thus, an object of the present invention is to provide a dust scattering preventing device in a powder spraying device capable of effectively suppressing dust scattering.

  The dust scattering preventing device in the powder spraying device of the present invention is provided with a ring-shaped nozzle tube above the spraying port of a hopper for spraying a powdered solidified material such as cement from a spraying port below, and the ring-shaped nozzle tube A large number of spray nozzles are mounted in a substantially downward direction, and a cylindrical mist curtain is spray-formed from the spray nozzles around the spray port without any gaps, so that dust falling from the spray port is scattered. It is characterized by being configured to prevent. The spray nozzle is mainly composed of a nozzle body, a compressed air supply port, a high-pressure water supply port, a mixing stem, and a nozzle orifice, and mixes high-pressure water with compressed air supplied at high pressure to inject mist. It is comprised so that it may do. Further, the plurality of spray nozzles are composed of fan-shaped spray nozzles that eject fan-shaped sprays and cone-shaped spray nozzles that eject conical spray, and these fan-shaped spray nozzles and conical spray nozzles are alternately arranged. A cylindrical mist curtain is spray-formed.

  The dust scattering prevention device in the powder spraying apparatus of the present invention suppresses the amount of water as much as possible by effectively arranging the spray nozzle, and there is no risk of being blown by a normal wind, so that a sealed mist curtain without gaps is spray formed. Thus, dust scattering can be effectively suppressed.

  FIG. 1 is a front view showing an embodiment of the apparatus of the present invention, and FIG. 2 is a bottom view thereof. 1 and 2, reference numeral 1 denotes a main body frame, and reference numeral 2 denotes a hopper having a conical lower portion 2a below and a spout 2b at the lower end of the conical lower portion 2a. Configure body spraying equipment.

  The main body frame 1 is suspended from an arm portion of a traveling device such as a backhoe (not shown) so that the powder spraying device can move on a spraying surface such as an improved roadbed.

  In the hopper 2, powder such as a solidified material such as cement is pumped together with high-pressure air for pumping, and the powder is separated from the high-pressure air for pumping, and drops from the spraying port 2 b onto the spraying surface. It has become. 2c is a supply pipe for supplying powder to the upper part of the hopper 2, and is oriented in the circumferential direction so that the powder sent by the high pressure air for pressure feeding becomes a cyclone flow in the hopper 2. Yes.

  Reference numeral 3 denotes a ring-shaped nozzle tube, which is configured to mount and arrange a large number of spray nozzles 4 substantially downward and to supply water to be supplied to the spray nozzles 4.

  FIG. 3 is an enlarged cross-sectional view of the spray nozzle 4, which mainly comprises a nozzle body 4a, a compressed air supply port 4b, a high-pressure water supply port 4c, a mixing stem 4d, and a nozzle orifice 4e, and is supplied at a high pressure. The compressed air is mixed with high-pressure water to inject mist.

  A compressed air supply pipe 5 is connected to a compressor (not shown) and supplies compressed air to the spray nozzle 4.

  In the present embodiment, twelve spray nozzles 4 are arranged in the ring-shaped nozzle tube 3 and, as is apparent from FIG. 4, fan-shaped spray nozzles 4 ′ for ejecting fan-shaped mist X and conical mist Y are ejected. Conical spray nozzles 4 ″ are alternately arranged, and a V-shaped gap formed between two fan-shaped mists X, X ejected by fan-shaped spray nozzles 4 ′ on both sides is formed into the conical spray nozzle 4 ″. Is compensated by a conical mist Y ejected, and the periphery of the spout 2b of the hopper 2 is surrounded by a cylindrical mist curtain without a gap.

  The fan-shaped spray nozzle 4 ′ can eject the fan-shaped mist X by, for example, configuring the nozzle tip in a slit shape. In particular, since the fan-shaped mist X is ejected with a narrow width, the amount of water consumption can be saved.

It is a front view which shows one Example of this invention apparatus. It is a bottom view of FIG. It is sectional drawing of a spray nozzle. It is explanatory drawing which shows the spraying state by two types of spray nozzles.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Main body frame 2 Hopper 2a Conical lower part 2b Spraying port 2c Supply pipe 3 Ring-shaped nozzle pipe 4 Spray nozzle 4 'Fan-shaped spray nozzle 4 "Conical spray nozzle 4a Nozzle body 4b Compressed air supply port 4c High-pressure water supply port 4d Mixing stem 4e Nozzle orifice 5 Compressed air supply pipe X Fan mist Y Conical mist

Claims (3)

  A ring-shaped nozzle tube is provided above the periphery of the spraying port of the hopper for spraying a powdered solidified material such as cement from the lower spraying port, and a large number of spray nozzles are attached to the ring-shaped nozzle tube so as to be directed substantially downward. And spraying a cylindrical mist curtain from these spray nozzles around the spraying port without any gaps to prevent scattering of dust falling from the spraying port. Dust scattering prevention device in equipment.   The spray nozzle is mainly composed of a nozzle body, a compressed air supply port, a high pressure water supply port, a mixing stem, and a nozzle orifice, so that high pressure water is mixed with the compressed air supplied at high pressure so as to inject mist. The dust scattering prevention device in the powder spraying device according to claim 1, wherein the dust scattering prevention device is configured as follows.   The plurality of spray nozzles are composed of fan-shaped spray nozzles that eject fan-shaped sprays and cone-shaped spray nozzles that eject conical spray, and these fan-shaped spray nozzles and conical spray nozzles are alternately arranged to form a cylinder. The dust scattering prevention device in the powder spraying device according to claim 1, wherein the mist curtain is spray-formed.