JP7595508B2 - Fiber spraying equipment - Google Patents

Description

The present invention relates to a fiber spraying device used for rock wool spraying work using the dry spraying method or semi-dry spraying method.

A fiber layer made of rock wool is commonly applied to the surface of a structure to provide fire resistance, fire prevention, sound absorption and/or heat insulation. A spraying method using a coagulant whose main components are granular fibers (fiber clumps with a diameter of several mm to several cm) and water is often used to form the fiber layer. Known methods for spraying rock wool include the wet method, the dry method and the semi-dry method.

The wet method uses a spray coating material made by mixing the main material (granular rock wool fiber or cement) with secondary materials (surfactants or thickeners), adding water to it, and mixing the mixture in a mixer, which is then sprayed from a nozzle using compressed air.

In the dry method, a dry mixture (dry mixture, hereafter sometimes referred to as "rock wool-cement cotton blend" or "cotton blend") made by dry-mixing granular rock wool fibers with cement is fed into a deflocculating device called a rock wool sprayer (rock wool sprayer) or deflocculating device, where it is deflocculated by a built-in deflocculating section such as a rotating cutter or rotating rod, and then sent out in a fixed amount into a pressure-feeding path by a rotary feeder or other device built into the deflocculating device, where it is pressure-fed through a hose by a blower (air blower), and discharged from a spray nozzle. At the same time, pressurized water is sprayed from multiple water nozzles arranged around the periphery of the spray nozzle and/or from a single water nozzle arranged near the central axis of the spray nozzle, and the two are joined, mixed, and sprayed.

The semi-dry method is a method in which the rock wool granular fibers are not mixed with cement in advance. In the semi-dry method, the rock wool granular fibers are fed into a cotton-pulping device in the same way as the mixed cotton in the dry method, and are pulverized (made into fine granules (fiber masses with a diameter of a few mm to a few cm)) by a built-in cotton-pulping section such as a rotary cutter or a rotating rod. The fibers are then quantitatively sent into a pressure-feeding path by a rotary feeder or the like built into the cotton-pulping device, and are pressure-fed through a hose by a blower (air blower) and supplied to the spray nozzle. The cement is mixed with water in a mixer to form a cement slurry, which is then pumped by a slurry pump through a conveying pipe (a hose for pressure-feeding cement slurry) to a liquid material (cement slurry) spray nozzle located on the granular fiber spray nozzle. The cement slurry is sprayed from a liquid material (cement slurry) spray nozzle located on the periphery of the granular fiber spray nozzle, or from a liquid material (cement slurry) spray nozzle located near the central axis of the granular fiber spray nozzle, and merges and mixes with the rock wool to form a fiber layer made of rock wool and cement hydrate. The semi-dry method produces less suspended dust and can form a coating layer with a bulk density close to that of the dry method. For these reasons, the semi-dry method has become the mainstream of rock wool spraying methods (see, for example, Patent Document 1 (page 2, figure 3), Patent Document 2 (figure 4), and Non-Patent Document 1).

Compared to wet methods, dry and semi-dry methods can pump material over longer distances, so even on large construction sites or those with multiple floors, there is no need to repeatedly move mixing equipment and materials such as mixers to the area where the material is to be sprayed, which saves time and effort. Also, compared to wet methods, dry and semi-dry methods can reduce the bulk density of the coating layer (sprayed rock wool layer) formed by rock wool spraying. For this reason, dry and semi-dry methods are more commonly used than wet methods.

JP 2002-348978 A Japanese Patent Application Publication No. 07-166618

"Fireproofing coating work" [online], First Built Co., Ltd., [Retrieved March 5, 2021], Internet <URL: http://www.firstb.co.jp/fireproofing_01.html>

However, in the dry and semi-dry construction methods, depending on the construction conditions, pulsation occurs when the rock wool granular fibers or mixed cotton (hereinafter referred to as "rock wool" or "fibers" as appropriate) is pumped, and even if the supply of rock wool to the fiber pumping path is stopped, fine rock wool particles remaining in the fiber pumping path continue to spray out from the fiber discharge port, or the rock wool can become clogged in the fiber pumping path.

When pulsation occurs, the quality of the fiber composition that is formed becomes unstable. When fine particles of rock wool are discharged, dust flies around, worsening the working environment. If the fiber pumping path becomes clogged, construction must be immediately halted. These events occur unexpectedly, which places a great psychological burden on the installers during construction.

The present invention is intended to solve the above problems, and aims to provide a technology in a fiber spraying device used in a fiber composition spraying method using a dry method or a semi-dry method, which is less likely to cause pulsation in the fiber pumping path, is less likely to cause fine particles of fibers remaining in the fiber pumping path to continue to be sprayed out of the fiber discharge port even when the supply of fibers such as rock wool to the fiber pumping path is stopped, and is less likely to cause fibers to become clogged in the fiber pumping path.

The present invention is intended to solve the above problems, and aims to provide a technology that can improve workability by suppressing pulsation in the fiber pumping path in a fiber spraying device used in a dry or semi-dry method of spraying a fiber composition, suppressing the continued ejection of fine particles of fibers that remain in the fiber pumping path from the fiber discharge port even when the supply of fibers such as rock wool to the fiber pumping path is stopped, and suppressing clogging of the fiber pumping path.

As a result of intensive research into solving the above problems, the inventors have found that the above problems can be solved by measuring the pressure in the fiber pumping path with a pressure gauge, transmitting pressure data _Pm in the fiber pumping path at that time to a (K) calculation device, comparing it with allowable pressure upper limit data _Pmax stored in an allowable pressure upper limit memory and allowable pressure lower limit data _Pmin stored in an allowable pressure lower limit memory, and when the allowable pressure is outside the allowable pressure range, suppressing or increasing the supply of fibers from the constant volume supply device of the cotton opener to the fiber pumping pipe by issuing a suppression command or an increase command from the control device, and have completed the present invention. That is, the present invention is a fiber spraying device as shown in the following (1) or (2).
(1) (A) a fiber spray nozzle having a fiber passage having a fiber nozzle at one end and a fiber pressure-feed hose connection port at the other end, one or more liquid additive nozzles, and one or more liquid additive hose connection ports;
(B) a fiber pressure-feeding hose;
(C) a fiber defatting machine having a fiber inlet, a fiber defatting device, a quantitative supply device, a motor, and a fiber pressure feed pipe;
(D) a blower;
(E) a liquid additive hose;
(F) a liquid additive pump having an inlet and an outlet;
The fiber pressure-feed hose (B) is connected to the fiber pressure-feed hose connection port of the fiber spray nozzle (A), and the liquid additive hose (E) is connected to the liquid additive hose connection port of the fiber spray nozzle (A),
The fiber pressure-feeding hose (B) is connected to one end of a fiber pressure-feeding pipe of the fiber opener (C), and the blower (D) is connected to the other end of the fiber pressure-feeding pipe, forming a fiber pressure-feeding path from the fiber pressure-feeding pipe of the fiber opener (C) to a fiber injection port of the fiber spray nozzle (A);
A fiber spraying device in which the liquid additive hose (E) is connected to the discharge port of the liquid additive pump (F), and a liquid additive supply source (G) is connected to the inlet of the liquid additive pump (F),
Furthermore,
(H) a pressure gauge capable of transmitting pressure data;
(I) a memory for storing an upper limit of an allowable pressure;
(J) a memory for storing an allowable pressure lower limit value;
(K) a calculation device;
(L) a control device;
The pressure gauge (H) is disposed in the fiber pumping path, and pressure data P _m in the fiber pumping path measured by the pressure gauge (H) is transmitted to the calculation device (K);
When the allowable pressure upper limit data _Pmax stored in the allowable pressure upper limit memory (I) is transmitted to the calculation device (K) and the following formula (1) is satisfied, the supply of fiber from the constant quantity supply device of the fiber defibrator (C) to the fiber pressure pipe is suppressed by a suppression command from the control device (L),
A fiber spraying apparatus characterized in that, when the allowable pressure lower limit data P _min stored in the allowable pressure lower limit memory (J) is transmitted to the calculation device (K) and the following equation (2) is satisfied, the supply of fiber from the constant volume supply device of the cotton defiberizer (C) to the fiber pressure pipe is increased by an increase command from the control device (L).
P _m > P _max (1)
P _m <P _min (2)
(2) Further, (O) a memory for a target pressure upper limit value and/or (P) a memory for a target pressure lower limit value are provided,
The fiber spraying device of (1) above, characterized in that when the target pressure upper limit data P _Tmax stored in the target pressure upper limit memory (O) and the target pressure lower limit data P _Tmin stored in the target pressure lower limit memory (P) are transmitted to the calculation device (K), and the following equation (3) is satisfied, the fiber blowing device (C) is controlled by a holding command from the control device (L) to hold the amount of fiber supplied per unit time from the constant-volume supply device of the fiber blowing device (C) to the fiber pressure pipe (hereinafter simply referred to as the "supply amount") constant.
P _Tmin ≦P _m ≦P _Tmax ...(3)

The present invention solves the above problems, and provides a fiber spraying device for use in a dry or semi-dry fiber composition spraying method, which is less likely to cause pulsation in the fiber pumping path, is less likely to cause fine particles of fibers remaining in the fiber pumping path to continue to spray from the fiber discharge port even when the supply of fibers such as rock wool to the fiber pumping path is stopped, and is less likely to cause fibers to become clogged in the fiber pumping path.

In addition, according to the present invention, in a fiber spraying device used in a fiber composition spraying method using a dry method or a semi-dry method, pulsation in the fiber pressure feed path is suppressed, fine particles of fibers remaining in the fiber pressure feed path are prevented from continuing to be sprayed from the fiber discharge port even when the supply of fibers such as rock wool to the fiber pressure feed path is stopped, and clogging of the fiber pressure feed path is suppressed, thereby improving workability. By suppressing pulsation, the mixture ratio of fibers and liquid additive is stabilized, and the quality of the formed fiber composition is stabilized. By suppressing the spraying of fine particles, dust generation is suppressed and the work environment is improved. By suppressing clogging in the fiber pressure feed path, work can be completed without interruption.

FIG. 1 is a schematic diagram of a fiber spraying apparatus according to the present invention. FIG. 2 is a diagram showing the relationship between the amount of fiber supplied into the fiber pumping path for each hose length, and the hose pressure and the conveying speed. FIG. 3 is an image diagram of the pressure in the fiber pumping path. FIG. 4 is an image diagram of the pressure in the fiber pumping path.

The fiber spraying device of the present invention comprises:
(A) a fiber spray nozzle having a fiber passage having a fiber nozzle at one end and a fiber pressure-feed hose connection port at the other end, one or more liquid additive nozzles, and one or more liquid additive hose connection ports;
(B) a fiber pressure-feeding hose;
(C) a fiber defatting machine having a fiber inlet, a fiber defatting device, a quantitative supply device, a motor, and a fiber pressure feed pipe;
(D) a blower;
(E) a liquid additive hose;
(F) a liquid additive pump having an inlet and an outlet;
The fiber pressure-feed hose (B) is connected to the fiber pressure-feed hose connection port of the fiber spray nozzle (A), and the liquid additive hose (E) is connected to the liquid additive hose connection port of the fiber spray nozzle (A),
The fiber pressure-feeding hose (B) is connected to one end of a fiber pressure-feeding pipe of the fiber opener (C), and the blower (D) is connected to the other end of the fiber pressure-feeding pipe, forming a fiber pressure-feeding path from the fiber pressure-feeding pipe of the fiber opener (C) to a fiber injection port of the fiber spray nozzle (A);
A fiber spraying device in which the liquid additive hose (E) is connected to the discharge port of the liquid additive pump (F), and a liquid additive supply source (G) is connected to the inlet of the liquid additive pump (F),
Furthermore,
(H) a pressure gauge capable of transmitting pressure data;
(I) a memory for storing an upper limit of an allowable pressure;
(J) a memory for storing an allowable pressure lower limit value;
(K) a calculation device;
(L) a control device;
The pressure gauge (H) is disposed in the fiber pumping path, and pressure data P _m in the fiber pumping path measured by the pressure gauge (H) is transmitted to the calculation device (K);
When the allowable pressure upper limit data _Pmax stored in the allowable pressure upper limit memory (I) is transmitted to the calculation device (K) and the following formula (1) is satisfied, the supply of fiber from the constant quantity supply device of the fiber defibrator (C) to the fiber pressure pipe is suppressed by a suppression command from the control device (L),
The allowable pressure lower limit data P _min stored in the allowable pressure lower limit memory (J) is transmitted to the calculation device (K), and when the following formula (2) is satisfied, the supply of fiber from the constant volume supply device of the cotton defibrator (C) to the fiber pressure pipe is increased by an increase command from the control device (L).
P _m > P _max (1)
P _m <P _min (2)

The fibers in the present invention refer to granular or short fibers, or granular or short fibers mixed with a binder such as cement and dry mixed (wherein the bulk of the fibers is greater than the bulk of the binder). Here, the bulk of the binder refers to the value obtained by dividing the mass of the binder contained by the bulk density of the binder, and the bulk of the fibers (granular or short fibers) refers to the value obtained by dividing the mass of the fibers (granular or short fibers) contained by the bulk density of the fibers. When short fibers are used as the fibers in the present invention, it is preferable to use fibers having a fiber length of 60 mm or less, and more preferably to use fibers having a fiber length of 30 mm or less. If the fiber length is long, the cross-sectional areas of the fiber pressure-feeding hose (B), the fiber passage of the fiber spray nozzle (A), and the fiber pressure-feeding pipe of the cotton-dissolving machine (C), that is, the cross-sectional area of the fiber pressure-feeding path, must be large, and the fiber pressure-feeding hose (B) and the fiber spray nozzle (A) become large and heavy, making it difficult to perform the spraying operation.
The granular fibers are fiber agglomerates having a diameter of several mm to several cm, preferably a fiber agglomerate having a diameter of 5 mm to 5 cm. In the case of mineral fibers such as rock wool, the granular cotton is obtained by subjecting raw cotton consisting of fiberized mineral fibers to one or a combination of two or more processes such as crushing, deflocculation, cutting, classification (e.g., sieving), and granulation. The granular cotton of rock wool includes fine and fine granular cotton of rock wool, and commercially available granular cotton, fine and fine granular cotton of rock wool such as "S-Fiber Granular Cotton" (trade name) manufactured by Japan Rock Wool Co., Ltd., "Lokceram Granular Cotton" (trade name) manufactured by JFE Rock Fiber Co., Ltd., and "Pacific Mineral Fiber Granular Cotton" (trade name) manufactured by Pacific Materials Co., Ltd. can be suitably used. When such granular rock wool is used, heat is not easily transmitted to the substrate covering the rock wool, and heat insulation, fire resistance or non-combustibility are obtained, and sound absorption is also obtained.

The fiber material in the present invention includes inorganic fibers, organic fibers, and mixtures of inorganic and organic fibers. Examples of inorganic fibers include metal fibers, carbon fibers, rock wool, glass wool, ceramic wool, etc., and examples of organic fibers include vegetable fibers such as cellulose fibers and jute fibers, animal fibers such as wool and feathers, and synthetic fibers such as polypropylene fibers and polyvinyl alcohol fibers. For example, cotton-like inorganic fibers selected from rock wool, glass wool, ceramic wool, etc. are preferable in terms of durability, sound absorption, and heat insulation, and are more preferable because rock wool or ceramic wool can maintain its shape without melting even when exposed to temperatures of 800°C or higher and is excellent in terms of heat resistance and fire resistance. Here, rock wool is a material (mineral fiber) made by quenching a material mainly composed of rocks or blast furnace slag melted in a melting furnace and fiberizing it. For example, slag wool made from a material mainly composed of blast furnace slag is also included.

Examples of the liquid additive in the present invention include water, an aqueous solution, an inorganic slurry, a resin emulsion, an inorganic-containing resin emulsion (a resin-containing inorganic slurry), and a mixture of two or more of these. More preferred examples include water, an aqueous solution, a hydraulic inorganic powder slurry such as cement or blast furnace slag powder, a slurry containing an inorganic powder such as _cement or blast furnace slag powder containing _Al2O3 , CaO, and/or _SiO2 in its composition, an alkali silicate, and water, a synthetic resin emulsion (polymer), and a cement-containing resin emulsion (a resin-containing cement slurry). Examples of the resin emulsion used in the liquid additive include emulsions of synthetic rubber (e.g., styrene-butadiene copolymer, chloroprene rubber, acrylonitrile-butadiene copolymer, methyl methacrylate-butadiene copolymer, etc.), emulsions of natural rubber, emulsions of synthetic resins (e.g., polyolefins (e.g., polyethylene, polypropylene, etc.), polychloroprene, polyacrylic acid esters, styrene-acrylic copolymers, all-acrylic copolymers, vinyl acetate resins (e.g., polyvinyl acetate, vinyl acetate-acrylic copolymers, vinyl acetate-acrylic acid ester copolymers, modified vinyl acetate, ethylene-vinyl acetate copolymers, ethylene-vinyl acetate-vinyl chloride copolymers, vinyl acetate-vinyl versatate copolymers, acrylic-vinyl acetate-Veova (t-vinyl decanoate product name) copolymers, etc.), unsaturated polyester resins, polyurethane resins, alkyd resins, and epoxy resins), and emulsions of bituminous materials (e.g., asphalt, rubber asphalt, etc.). The liquid additive is expected to act as a flocculant that aggregates fibers together due to its own viscosity. Therefore, hydraulic inorganic powder slurries such as cement slurries, slurries containing inorganic _powders such as cement and blast furnace slag powder that contain _Al2O3 , CaO and/or _SiO2 , alkali silicate and water, synthetic resin emulsions (polymers) and cement-containing resin emulsions (resin-containing cement slurries) are particularly preferred because they bond fibers together more firmly by hardening and/or evaporation of the dispersion medium.

The fiber spray nozzle (A) of the present invention comprises a fiber passage having a fiber nozzle at one end and a fiber pressure-feed hose connection port at the other end, one or more liquid additive nozzles, and one or more liquid additive hose connection ports. The fiber passage in the fiber spray nozzle is preferably formed by a fiber conduit, the internal cavity of the fiber conduit being the fiber passage, one end of the opening of the fiber conduit being the fiber nozzle, and the other end being the fiber pressure-feed hose connection port. The material of the fiber conduit is not particularly limited, and examples of preferred materials include one or a combination of two or more selected from metal, resin such as rubber, ceramics, glass, stone, wood, and bamboo, but from the viewpoint of ease of molding and strength, a combination of one or a combination of two or more selected from metal, resin such as rubber, and ceramics is more preferred.

It is preferable that one or more liquid additive nozzles provided on the fiber spray nozzle (A) used in the present invention are arranged on the wall forming the fiber passage, inside the fiber passage, and/or on the outer periphery of the fiber nozzle. When one liquid additive nozzle is arranged inside the fiber passage, it is preferable to arrange the aggregate nozzle on the central axis of the fiber passage, and when a liquid additive nozzle is arranged on the wall forming the fiber passage or on the outer periphery of the fiber nozzle, it is preferable to arrange the liquid additive nozzle so that the central axis of the fiber flow in the fiber passage or the fiber flow sprayed from the fiber nozzle intersects with the central axis of the liquid additive flow sprayed from the liquid additive nozzle.

The materials of the fiber pressure-feeding hose (B) and liquid additive hose (E) used in the present invention are not particularly limited, and examples of preferred materials include one or a combination of two or more materials selected from metals and resins such as rubber. However, resin hoses are more preferred for ease of handling, and since both hoses are subject to internal pressure, it is preferable to use resin pressure-resistant hoses.

The cotton-opening machine (C) in the present invention is equipped with a fiber inlet, a cotton-opening device, a quantitative supply device, a motor, and a fiber pressure pipe. Two or more fiber inlets, cotton-opening devices, quantitative supply devices, motors, and fiber pressure pipes may be provided. The fibers input into the fiber inlet are loosened by the cotton-opening device and then sent to the quantitative supply device, and a fixed amount of fibers per unit time is supplied to the fiber pressure pipe. The cotton-opening device has one or more protrusions (e.g., I-shaped, L-shaped, plate-shaped, needle-shaped, etc. protrusions), blades, blades, or chains attached to or formed on the rotating shaft, and the rotating shaft is rotated by the drive of the motor provided in the cotton-opening machine (C).

The fiber inlet of the cotton-loosening machine (C) in the present invention is not limited in shape or material as long as it has a structure that allows fibers to be fed into the cotton-loosening machine (C), but a hopper-shaped or slope-shaped inlet is preferable because it allows fibers to be fed continuously into the cotton-loosening machine (C).

The quantitative supply device of the cotton opener (C) in the present invention may be any device capable of supplying a quantitative amount of fiber, and screw feeders, belt feeders, and rotary feeders are preferred examples. However, for quantitative supply of fiber to the fiber pressure feed pipe of the cotton opener (C), a rotary feeder is preferred because it is easy to supply fiber to the fiber pressure feed pipe in a sealed state. The quantitative supply device of the cotton opener (C) is structured so that the screw, roller, rotor, etc. are rotated by the drive of a motor provided in the cotton opener (C), and the rotation speed per unit time of the screw, roller, rotor, etc. varies depending on the rotation speed per unit time of the motor.

The blower in the present invention is not particularly limited as long as it can supply air by applying pressure to the fiber compression path, but a ring blower and/or a roots blower are preferred. The blower is connected to the fiber compression pipe of the cotton opener (C). Note that the connection referred to in the present invention includes not only direct connection, but also indirect connection, except when the same effect as in the case of direct connection cannot be obtained. The blower in the present invention may be part of the cotton opener (C).

The liquid additive pump (F) used in the present invention has an inlet and an outlet. The inlet of the liquid additive pump (F) is connected to the liquid additive supply source (G), and the outlet of the liquid additive pump (F) is connected to the liquid additive hose (E). The liquid additive pump (F) used in the present invention may be any pump that can pump the liquid additive. Examples of the liquid additive pump (F) include reciprocating pumps (e.g., diaphragm pumps, piston pumps, plunger pumps, etc.), rotary pumps (e.g., screw pumps, gear pumps, etc.), centrifugal pumps (e.g., turbine pumps, volute pumps, etc.), squeeze pumps, etc. As the liquid additive pump (F) used in the present invention, a reciprocating pump, a rotary pump, and a squeeze pump are preferred examples because they are easy to pump a fixed amount of liquid additive.

Preferred examples of the liquid additive supply source (G) in the present invention include a liquid additive storage tank in which the liquid additive is stored and a liquid additive supply valve. When the liquid additive is water, the liquid additive supply valve is, for example, a water tap. The inlet of the liquid additive pump (F) and the liquid additive supply source (G) are often connected via a hose (pipe).

The pressure gauge (H) in the present invention is not particularly limited as long as it can transmit and transmit the measured pressure data _Pm in the fiber pressure-feeding path to the calculation device (K). The pressure gauge is disposed in the fiber pressure-feeding path, but it is preferable to dispose it in the fiber pressure-feeding pipe of the cotton opener (C) or in the fiber pressure-feeding path within 10 m from the fiber pressure-feeding pipe, since the influence of pressure loss can be almost ignored and the influence of a malfunction in the fiber pressure-feeding path is easily expressed as pressure fluctuation. The pressure gauge (H) may be disposed directly in the fiber pressure-feeding pipe or fiber pressure-feeding hose (B) of the cotton opener (C), or may be disposed in the fiber pressure-feeding path by being disposed in a metal pipe such as a steel pipe and then connected to the fiber pressure-feeding pipe and fiber pressure-feeding hose (B) of the cotton opener (C) or to two fiber pressure-feeding hoses (B) so as to sandwich the exchange.

The control device (L) in the present invention may be of any mechanism as long as it can control the supply of fibers from the quantitative supply device of the cotton opener (C) to the fiber pressure pipe. For example, preferred examples include a method of controlling the voltage or frequency of the motor driving the quantitative supply device of the cotton opener (C), and a method of adjusting the gear ratio of a gear device when the quantitative supply device of the cotton opener (C) is driven via a gear device (gear box).

In the present invention, the allowable pressure upper limit memory (I) stores allowable pressure upper limit data P _max . The allowable pressure lower limit memory (J) stores allowable pressure lower limit data P _min . The allowable pressure upper limit data P _max and the allowable pressure lower limit data P _min may be determined from the construction conditions such as the hose length and layout conditions (arrangement conditions) of the fiber pressure-feeding hose (B), the wind speed of the blower when the fiber is not supplied to the fiber pressure-feeding pipe, and the target fiber discharge amount per unit time (amount of fiber supplied to the fiber pressure-feeding pipe), or may be determined from the pressure data P m in the fiber pressure-feeding pipe measured by the pressure gauge (H) after a test supply of fiber to the fiber pressure-feeding pipe and spraying (discharging ₎ from the fiber spray nozzle (A) before the actual construction to confirm that no pulsation or clogging occurs in the fiber pressure-feeding pipe and that no large fluctuations in the pressure in the fiber pressure-feeding pipe occur. In addition, prior to the actual construction, the amount of fiber supplied to the fiber pumping pipe per unit time may be changed and the fibers may be test-supplied to the fiber pumping pipe and sprayed (discharged) from the fiber injection port of the fiber spray nozzle (A) to confirm that no pulsation or clogging occurs in the fiber pumping path and that no large fluctuations in pressure occur in the fiber pumping path. The maximum value of the pressure data _Pm in the fiber pumping path measured by the pressure gauge (H) at that time may be taken as the allowable pressure upper limit data _Pmax , and the minimum value of the pressure data _Pm in the fiber pumping path may be taken as the allowable pressure lower limit data _Pmin .

In the present invention, pressure data _Pm in the fiber pressure-feeding path measured by the pressure gauge (H) is transmitted to the calculation device (K), and allowable pressure upper limit data _Pmax stored in the allowable pressure upper limit memory (I) is transmitted to the calculation device (K), and when the following formula (1) is satisfied, a suppression command is issued from the control device (L). This suppression command suppresses the supply of fiber from the constant-volume supply device of the cotton opener (C) to the fiber pressure-feeding pipe.
P _m > P _max (1)
In other words, when the pressure data _Pm in the fiber pumping path is greater than the allowable pressure upper limit data _Pmax , the amount of fiber supplied to the fiber pumping pipe per unit time is suppressed (reduced) to lower the pressure in the fiber pumping path, and the pressure data _Pm in the fiber pumping path is made equal to or less than the allowable pressure upper limit data _Pmax .

In the present invention, pressure data _Pm in the fiber pumping path measured by the pressure gauge (H) is transmitted to the calculation device (K), and allowable pressure lower limit data _Pmin stored in the allowable pressure lower limit memory (J) is transmitted to the calculation device (K), and when the following formula (2) is satisfied, an increase command is issued from the control device (L). This increase command increases the supply of fiber from the constant volume supply device of the cotton opener (C) to the fiber pumping pipe.
P _m <P _min (2)
In other words, when the pressure data _Pm in the fiber pumping path is smaller than the allowable pressure lower limit data _Pmin , the amount of fiber supplied to the fiber pumping pipe per unit time is increased (increased), thereby increasing the pressure in the fiber pumping path, and the pressure data _Pm in the fiber pumping path is set to be equal to or greater than the allowable pressure lower limit data _Pmin.

The present invention further comprises an (O) target pressure upper limit memory and/or a (P) target pressure lower limit memory, and when the target pressure upper limit data P Tmax stored in the (O) target pressure upper limit memory and the target pressure lower limit data P _Tmin stored in the (P) target pressure lower limit _memory are transmitted to a (K) calculation device and the following equation (3) is satisfied, it is preferable to control the (C) cotton opener in response to a hold command from the (L) control device so as to hold the amount of fiber supplied from the (C) constant volume supply device of the cotton opener to the fiber pressure feed pipe.
P _Tmin ≦P _m ≦P _Tmax ...(3)

In the present invention, the target pressure upper limit memory (O) stores target pressure upper limit data P _Tmax . In addition, the target pressure lower limit memory (P) stores target pressure lower limit data P _Tmin . The target pressure upper limit data P _Tmax and the target pressure lower limit data P _Tmin may be determined from the construction conditions such as the hose _length and layout conditions (arrangement conditions) of the fiber pressure-feeding hose (B), the wind speed of the blower when the fiber is not supplied to the fiber pressure-feeding pipe, and the target fiber discharge amount per unit time ( _the amount of fiber supplied to the fiber pressure-feeding pipe), as in the case of the allowable pressure upper limit data P max and the allowable pressure lower limit data P min. Alternatively, the target pressure upper limit data P Tmax and the target pressure lower limit data P Tmin may be determined from the pressure data P m in the fiber pressure-feeding pipe measured by the pressure gauge (H) by experimentally supplying the fiber to the fiber pressure-feeding pipe and spraying (discharging ₎ it from the fiber spray nozzle (A) before the actual construction to confirm that no pulsation or clogging occurs in the fiber pressure-feeding path and that no large fluctuations in the pressure in the fiber pressure-feeding path occur. Also, before the actual construction, the fiber supply amount to the fiber pumping pipe per unit time is changed, and the fibers are experimentally supplied to the fiber pumping pipe and sprayed (discharged) from the fiber spray nozzle (A) through the fiber spray nozzle (A) to confirm that no pulsation or clogging occurs in the fiber pumping path and that no large fluctuations in the pressure in the fiber pumping path occur, and the maximum value of the pressure data _Pm in the fiber pumping path measured by the pressure gauge (H) at that time may be set as the target pressure upper limit data P _Tmax and the minimum value of the pressure data _Pm in the fiber pumping path as the target pressure lower limit data P _Tmin . The target pressure upper limit data P _Tmax is set within a range satisfying the following formula (4), and the target pressure lower limit data P _Tmin is set within a range satisfying the following formula (5). Preferably, since it is easy to set the pressure in the fiber pumping path within a range from the lower limit value of the allowable pressure to the upper limit value of the allowable pressure, the target pressure upper limit data P _Tmax is set within a range satisfying the following formula (6), and the target pressure lower limit data P _Tmin is set within a range satisfying the following formula (7). The target pressure upper limit data P _Tmax and the target pressure lower limit data P _Tmin may be the same value.
P _min ≦P _Tmax ≦P _max (4)
P _min ≦P _Tmin ≦P _max・・・(5)
P _min <P _Tmax <P _max (6)
P _min <P _Tmin <P _max ...(7)

The pressure data _Pm in the fiber pressure-feeding path measured by the pressure gauge (H) is transmitted to the calculation device (K), and the allowable pressure upper limit data _Pmax stored in the allowable pressure upper limit memory (I) is transmitted to the calculation device (K). When the above formula (1) is satisfied, a suppression command is issued from the control device (L). This suppression command suppresses the supply of fiber from the constant-volume supply device of the cotton opener (C) to the fiber pressure-feeding tube. As a result, the pressure data _Pm in the fiber pressure-feeding path becomes smaller. Thereafter, when the pressure data _Pm in the fiber pressure-feeding path satisfies the above formula (3), that is, when the pressure data _Pm in the fiber pressure-feeding path falls within the range from the target pressure lower limit data P _Tmin to the target pressure upper limit data P _Tmax , the control device (L) controls the cotton opener (C) to keep the amount of fiber supplied per unit time from the constant-volume supply device of the cotton opener (C) to the fiber pressure-feeding tube constant by a holding command. As a result, the pressure data _Pm in the fiber pumping path can be set within the range of the target pressure lower limit data _PTmin to the target pressure upper limit data _PTmax , i.e., within the range of the allowable pressure lower limit data _Pmin to the allowable pressure upper limit data _Pmax. Therefore, pulsation is less likely to occur in the fiber pumping path, and even if the supply of fibers such as rock wool to the fiber pumping path is stopped, fine fibers remaining in the fiber pumping path are less likely to continue to be ejected from the fiber discharge port, and the fibers are less likely to become clogged in the fiber pumping path.

The following description will be given based on an embodiment of the present invention, but the present invention is not limited to the embodiment. Figure 1 shows a schematic diagram of an example of the fiber spraying device of the present invention. The fiber spraying device 10 includes a fiber spraying nozzle 1, a fiber pressure feed hose 9, a cotton loosening machine 20, a blower 14, a steel pipe to which a pressure gauge 2 is attached so that the pressure inside the pipe can be measured, a liquid additive hose 6, a liquid additive pump 7, a conversion device 31, a calculation device 30, an allowable pressure upper limit memory 32, an allowable pressure lower limit memory 33, a target pressure upper limit memory 34, a target pressure lower limit memory 35, and a control device 40.

The fiber spray nozzle 1 comprises a fiber conduit with one end serving as a fiber nozzle and the other end serving as a fiber pressure-feed hose connection port, and a liquid additive nozzle 3 disposed on the central axis of the fiber conduit (fiber passage). The liquid additive nozzle 3 is one end of a metal tube, the other end of which protrudes outside the fiber conduit, and a liquid additive hose 6 is connected thereto as a liquid additive hose connection port. The other end of the liquid additive hose 6 is connected to the outlet of a liquid additive pump 7. A suction hose is connected to the inlet of the liquid additive pump 7, and the other end of the suction hose is inserted into the liquid additive 4 stored in a liquid additive storage tank 8.

A fiber pressure-feed hose 9 is connected to the fiber pressure-feed hose connection port of the fiber spray nozzle 1, and the other end of the fiber pressure-feed hose 9 is connected to the opening of a metal tube in which a pressure gauge 2 is installed so that the internal pressure can be measured. The other end of the metal tube is connected to a fiber pressure-feed pipe 26 of the cotton opener 20. The other end of the fiber pressure-feed pipe 26 is connected to a blower (Roots blower) 14. The blower (Roots blower) 14, the fiber pressure-feed pipe 26 of the cotton opener 20, the metal tube in which the pressure gauge 2 is installed, the fiber pressure-feed hose 9, and the fiber conduit of the fiber spray nozzle 1 are all interconnected, and the fiber pressure-feed pipe 26 of the cotton opener 20 to the fiber conduit (fiber injection port) of the fiber spray nozzle 1 form a fiber pressure-feed path.

The defibrillator 20 is equipped with a fiber pressure feed pipe 26, a fiber inlet consisting of a hopper 23, a first defibrillator section 21 (defibrillator), a second defibrillator section 22 (defibrillator), a screw feeder 24 (quantitative supply device), a rotary feeder 25 (quantitative supply device), and a motor (not shown). The first defibrillator section 21 is equipped with a plurality of L-shaped steel rods on a rotating shaft, and when the rotating shaft is rotated by the drive of the motor, the L-shaped steel rods hit the fibers 11 input into the hopper 23 when they rotate, and the fibers 11 are defibrated and fall onto the screw feeder 24. When the screw feeder 24 is rotated by the drive of the motor, the defibrated fibers are supplied in a fixed amount to the second defibrillator section 22. The second defibrillator section 22 has a structure in which a plurality of steel protrusions (I-shaped steel rods) are attached to the rotating shaft. The fibers sent to the second defibrating section 22 hit an I-shaped steel rod rotating by the drive of a motor and become further defibrated fibers 5. The granular fibers 5 enter a pocket formed by two flat plates welded to the rotating shaft of a rotary feeder 25 located below the second defibrating section 22, and then are supplied in a fixed amount to a fiber pressure pipe 26 located below the rotary feeder 25 as the rotating shaft of the rotary feeder 25 rotates by the drive of a motor. In the case of a dry mixture of granular fibers or short fibers such as cotton blends and a binder such as cement, the dry mixture in which the granular fibers or short fibers are defibrated and finely broken is supplied in a fixed amount to the fiber pressure pipe 26.

The loosened fibers 5 supplied in a fixed amount to the fiber pressure pipe 26 are pressure-fed through the fiber pressure path to the fiber nozzle of the fiber spray nozzle 1 by the air flow from the blower 14, and are sprayed (discharged) from the fiber nozzle. Meanwhile, the liquid additive 4 stored in the liquid additive storage tank 8 is sucked by the liquid additive pressure pump 7, and then sprayed from the liquid additive nozzle 3 of the fiber spray nozzle 1 through the liquid additive hose 6, where it is mixed with the loosened fibers 5 sprayed (discharged) from the fiber nozzle, and sprayed onto the object to be coated 13, forming a fiber layer made of the mixed mixture on the surface of the object to be coated 13.

The pressure inside the fiber pumping path is measured by the pressure gauge 2. The hose length was set to 20 m, 40 m, and 60 m, and a cotton blend (rock wool/cement blend) was used as the fiber. The amount of fiber supplied per unit time to the fiber pumping pipe 26 (fiber pumping path) was changed, and the hose pressure (pressure inside the fiber pumping path) and the fiber discharge time were measured as follows to determine the fiber transport speed. The results are shown in Figure 2.

Amount of mixed cotton supplied per unit time The spray nozzle was removed from the fiber pressure-feed hose, a gunny bag was attached to the end of the fiber pressure-feed hose, and only the mixed cotton was sprayed for 30 seconds. The mass W of the material that entered the gunny bag at that time was measured, and the amount of mixed cotton supplied per unit time S was calculated using the following formula (8). The amount of supply can be set by controlling the number of rotations per unit time of the motor of the cotton opener 20 based on a command (instruction) from the control device 40.
S=W/0.5 (8)

Discharge time of mixed cotton The time from when the rotation of the rotary feeder 25 of the cotton opener was stopped, i.e., when the supply of the mixed cotton to the fiber pressure-feeding pipe 26 was stopped, to when the rock wool granular fibers contained in the mixed cotton were completely discharged from the fiber pressure-feeding path was measured, and this was taken as the discharge time t of the mixed cotton. Furthermore, the length L of the fiber pressure-feeding hose (hose length) divided by the discharge time t was taken as the conveying speed V, which was calculated using the following formula (9).
V=L/t...(9)

From FIG. 2, it can be seen that as the amount of fiber (cotton blend) supplied to the fiber pressure pipe 26 (fiber pressure path) per unit time increases, the hose pressure (pressure in the fiber pressure path) increases and the conveying speed tends to decrease. If the conveying speed decreases too much, there is a risk of the fiber clogging in the fiber pressure path. In addition, the amount of fiber (cotton blend) supplied to the fiber pressure pipe 26 (fiber pressure path) per unit time can also be estimated from the hose pressure (pressure in the fiber pressure path). If the hose pressure (pressure in the fiber pressure path) is too high, the fiber is likely to clog in the fiber pressure path, pulsation is likely to occur, and fine fiber particles are likely to continue to be ejected from the fiber discharge port. In addition, if the hose pressure (pressure in the fiber pressure path) is too low, the amount of fiber (cotton blend) supplied to the fiber pressure pipe 26 (fiber pressure path) per unit time is too small, resulting in a long construction time.

In the fiber spraying device 10 shown in Figure 1, pressure data _Pm within the fiber pressure path measured by the pressure gauge 2 can be sent via a conversion device 31 to a calculation device 30, a memory 32 for an allowable pressure upper limit value, a memory 33 for an allowable pressure lower limit value, a memory 34 for a target pressure upper limit value, and a memory 35 for a target pressure lower limit value. Prior to this construction, the amount of fiber supplied to the fiber pumping pipe 26 per unit time is changed and fiber is test-supplied into the fiber pumping pipe 26 and sprayed (discharged) from the fiber injection port of the fiber spray nozzle 1 to confirm that no pulsation or clogging is occurring in the fiber pumping path and that no large fluctuations in pressure are occurring in the fiber pumping path. Four points of pressure data _Pm in the fiber pumping path are measured by the pressure gauge 2 at that time and converted by the conversion device 31 and sent to the allowable pressure lower limit memory 33, the target pressure lower limit memory 35, the target pressure upper limit memory 34 and the allowable pressure upper limit memory 32 in ascending order of pressure, and can be set as the allowable pressure lower limit data _Pmin , the target pressure lower limit data _PTmin , the target pressure upper limit data _PTmax and the allowable pressure upper limit data _Pmax , respectively. The allowable pressure lower limit data P _min , the target pressure lower limit data P _Tmin , the target pressure upper limit data P _Tmax , and the allowable pressure upper limit data P _max may be input as numerical values, or data recorded on a recording medium such as a read-only memory (ROM) or random access memory (RAM) provided in the fiber spraying apparatus 10 or on a recording medium of an external device (e.g., a server) may be read and used.

During the actual fiber spraying, pressure data _Pm in the fiber pumping path measured by the pressure gauge 2 is sent to the calculation device 30 via the conversion device 31. In addition, allowable pressure upper limit data _Pmax stored in the allowable pressure upper limit memory 32 and allowable pressure lower limit data _Pmin stored in the allowable pressure lower limit memory 33 are transmitted to the calculation device 30. It is confirmed in the calculation device 30 whether the following formula (1) or the following formula (2) is satisfied.
P _m > P _max (1)
P _m <P _min (2)

When the above formula (1) is satisfied, the pressure in the fiber pressure path is too high, that is, the amount of fiber supplied to the fiber pressure pipe 26 per unit time is too large, so the calculation device 30 sends a signal to the control device 40 indicating that the above formula (1) is satisfied. The control device 40, which receives the signal, sends a suppression command to the cotton defibrator 20. The cotton defibrator 20, which receives the suppression command, suppresses the number of rotations per unit time of the motor, thereby suppressing the number of rotations per unit time of each of the rotating shafts of the screw feeder 24, the second cotton defibrator section 22, and the rotary feeder 25, and reducing the amount of fiber supplied to the fiber pressure pipe 26 per unit time. The motor provided in the cotton defibrator 20 may directly receive the suppression command from the control device 40, suppress the number of rotations per unit time of the motor, suppress the number of rotations per unit time of each of the rotating shafts of the screw feeder 24, the second cotton defibrator section 22, and the rotary feeder 25, and reduce the amount of fiber supplied to the fiber pressure pipe 26 per unit time.

When the above formula (2) is satisfied, the pressure in the fiber pressure path is too low, that is, the amount of fiber supplied to the fiber pressure pipe 26 per unit time is too small, so the calculation device 30 sends a signal to the control device 40 indicating that the above formula (2) is satisfied. The control device 40, which receives the signal, sends an increase command to the cotton defibrator 20. The cotton defibrator 20, which receives the suppression command, increases the number of rotations per unit time of the motor, thereby increasing the number of rotations per unit time of each of the rotating shafts of the screw feeder 24, the second cotton defibrator section 22, and the rotary feeder 25, and increasing the amount of fiber supplied to the fiber pressure pipe 26 per unit time. The increase command from the control device 40 may be directly received by the motor provided in the cotton defibrator 20, and the number of rotations per unit time of the motor may be increased, and the number of rotations per unit time of each of the rotating shafts of the screw feeder 24, the second cotton defibrator section 22, and the rotary feeder 25 may be increased, thereby increasing the amount of fiber supplied to the fiber pressure pipe 26 per unit time.

By repeating these steps, the pressure in the fiber pumping path is kept within an acceptable range, i.e., the amount of fiber supplied to the fiber pumping pipe 26 per unit time is kept within an acceptable range, pulsation is unlikely to occur in the fiber pumping path, fine particles of fibers remaining in the fiber pumping path are unlikely to continue to be ejected from the fiber discharge port even if the supply of fibers such as rock wool to the fiber pumping path is stopped, and fibers are unlikely to become clogged in the fiber pumping path. An image diagram of the pressure in the fiber pumping path is shown in Figure 3.

Furthermore, the above formula (1) is established, and a signal indicating that the above formula (1) is established is transmitted from the calculation device 30 to the control device 40, and the control device 40 which receives the signal transmits a suppression command to the cotton opener 20, and the cotton opener 20 which receives the suppression command suppresses the rotations per unit time of the motor, thereby suppressing the rotations per unit time of the rotating shaft of the rotary feeder 25, and after reducing the amount of fiber supplied to the fiber pressure feed pipe 26 per unit time, transmits the target pressure upper limit data P _Tmax stored in the target pressure upper limit memory 34 and the target pressure lower limit data P _Tmin stored in the allowable target pressure lower limit memory 35 to the calculation device 30. It is confirmed in the calculation device 30 whether the following formula (3) is established: P _Tmin ≦P _m ≦P _Tmax (3)

When the above formula (3) is satisfied, the calculation device 30 transmits a signal indicating that the above formula (3) is satisfied to the control device 40, and the control device 40 that receives the signal transmits a hold command to the cotton opener 20, and the cotton opener 20 that receives the hold command holds the rotations per unit time of the motor, thereby holding the rotations per unit time of the rotary shaft of the rotary feeder 25, and holding the amount of fiber supplied to the fiber pressure pipe 26 per unit time. Therefore, the pressure in the fiber pressure pipe is within the target range, that is, the amount of fiber supplied to the fiber pressure pipe 26 per unit time is within the target range, and further, pulsation is unlikely to occur in the fiber pressure pipe, and even if the supply of fibers such as rock wool to the fiber pressure pipe is stopped, fine particles of fibers remaining in the fiber pressure pipe are unlikely to continue to be ejected from the fiber discharge port, and fibers are unlikely to be clogged in the fiber pressure pipe. An image diagram of the pressure in the fiber pressure pipe is shown in Figure 4.

The present invention can be suitably used, for example, in construction work in which fibers such as rock wool or fiber compositions are sprayed to form a fiber composition layer, which is used to impart fire resistance, fire prevention, sound absorption, and/or heat insulation properties to structural components.

REFERENCE SIGNS LIST 1 Fiber spray nozzle 2 Pressure gauge 3 Jet nozzle for liquid additive 4 Liquid additive 5 Granular fiber 6 Liquid additive pressure-feed hose 7 Liquid additive pressure-feed pump 8 Liquid additive storage tank 9 Fiber pressure-feed hose 10 Fiber spray device 11 Fiber or fiber dry composition 12 Fiber layer made of confluent mixture 13 Object to be coated 14 Blower (air blower)
20: deflocculating machine 21: first deflocculating section 22: second deflocculating section 23: hopper 24: screw feeder 25: rotary feeder (quantitative supply device)
26 Fiber pressure pipe 30 Calculation device 31 Conversion device 32 Allowable pressure upper limit value memory 33 Allowable pressure lower limit value memory 34 Target pressure upper limit value memory 35 Target pressure lower limit value memory 40 Control device

Claims (2)

(A) a fiber spray nozzle having a fiber passage having a fiber nozzle at one end and a fiber pressure-feed hose connection port at the other end, one or more liquid additive nozzles, and one or more liquid additive hose connection ports;
(B) a fiber pressure-feeding hose;
(C) a fiber defatting machine having a fiber inlet, a fiber defatting device, a quantitative supply device, a motor, and a fiber pressure feed pipe;
(D) a blower;
(E) a liquid additive hose;
(F) a liquid additive pump having an inlet and an outlet;
The fiber pressure-feed hose is connected to the fiber pressure-feed hose connection port of the fiber spray nozzle, and the liquid additive hose is connected to the liquid additive hose connection port of the fiber spray nozzle,
the fiber pressure-feeding hose is connected to one end of the fiber pressure-feeding pipe of the fiber opener, and the blower is connected to the other end of the fiber pressure-feeding pipe, forming a fiber pressure-feeding path from the fiber pressure-feeding pipe of the fiber opener to the fiber injection port of the fiber spray nozzle;
A fiber spraying device, the liquid additive hose being connected to the discharge port of the liquid additive pump, and the liquid additive supply source being connected to the inlet of the liquid additive pump,
Furthermore,
(H) a pressure gauge capable of transmitting pressure data;
(I) a memory for storing an upper limit of an allowable pressure;
(J) a memory for storing an allowable pressure lower limit value;
(K) a calculation device;
(L) a control device;
The pressure gauge is disposed in the fiber pumping path, and pressure data P _m in the fiber pumping path measured by the pressure gauge is transmitted to the calculation device;
When the allowable pressure upper limit data _Pmax stored in the allowable pressure upper limit memory is transmitted to the calculation device and the following formula (1) is satisfied, the supply of fibers from the constant quantity supply device of the fiber defibrator to the fiber pressure pipe is suppressed by a suppression command from the control device,
A fiber spraying device characterized in that, after transmitting the allowable pressure lower limit data P _min stored in the allowable pressure lower limit memory to the calculation device, when the following equation (2) is satisfied, the supply of fiber from the fixed quantity supply device of the cotton defibering machine to the fiber pressure pipe is increased by an increase command from the control device.
P _m > P _max (1)
P _m <P _min (2) Furthermore,
(O) a memory for a target pressure upper limit value and/or (P) a memory for a target pressure lower limit value are provided;
The fiber spraying device according to claim 1, characterized in that, after transmitting the target pressure upper limit data P _Tmax stored in the target pressure upper limit memory and the target pressure lower limit data P _Tmin stored in the target pressure lower limit memory to the calculation device, when the following equation (3) is satisfied, the fiber blowing device is controlled by a holding command from the control device so as to hold the amount of fiber supplied per unit time from the quantitative supply device of the fiber blowing device to the fiber pressure transport pipe constant.
P _Tmin ≦P _m ≦P _Tmax ...(3)

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