JPH01189363A - Material spraying device - Google Patents

Abstract

PURPOSE:To automatically change materials when the different kinds of materials are separately sprayed by controlling the change, selection, and supply of materials and the injection of compressed air according to a specified time schedule with specified intensity. CONSTITUTION:The different kinds of materials are discharged into forced-feed hoses 9a and 9b from two to several material tanks 1a and 1b provided with rotary feeder 2a and 2b at the bottom, transferred to a transport hose 12, and sprayed from a nozzle 13. Forced-feed air blowoff ports 6a and 6b, shutters 7a and 7b, and cleaning air blowoff ports 8a and 8b are provided in the vicinity of the discharge ports 4a and 4b at the bottoms of the respective material tanks. A signal from a nozzle driving device 20 is inputted to an operation control means 21, and the change of the forced-feed hoses at a change-over device 11, the rotation and stoppage of rotary feeders, the opening and closing of forced-feed air, the opening and closing of shutters, and the opening and closing of cleaning air are controlled by the control means 21 according to the time schedule.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention is applicable to a plurality of different materials used when repairing a lining wall by spraying monolithic refractory materials (hereinafter simply referred to as "materials"). Material spraying is concerned with equipment that can automatically carry out appropriate operational controls accordingly.

[Conventional technology]

To repair the refractory linings of various types of furnaces and molten metal containers that have worn out over long periods of use, the method used is to use a spray device equipped with a nozzle at the tip to spray and bond the material.

Recently, for example, as seen with slang lines,
When repairing the lining of a single container, it is necessary to spray different materials, and it is important that the materials can be switched without stopping the nozzle, and that the thickness and condition of the coating at the switching area are accurate and of high quality. It has been demanded.

FIG. 3 is an explanatory diagram showing a conventional material spraying device disclosed in Japanese Utility Model Application Publication No. 62-106657. In the figure, 1 and 2 are powder material supply units (
material tank), and a material feeding device (rotary feeder) 13.23 is installed at the bottom of the tank.
Reference numeral 1.231 is a motor for this rotation, and reference numeral 14.24 is a material discharge port communicating with the bottom of the tank, which is connected to the connector 3 via a material receiving port 32, 33, respectively. A pie break for the material tank is shown at 15.25.

The connector 3 is connected to a pressure gas a (air compressor) 70 on one side and a material pressure feeding pipe 4 on the other side, and a nozzle 5 is attached to the tip thereof.

Note that the remote control device 6 and the nozzle 5 are operated by the operator hand-held. The remote control device 6 is connected to a pressure gas source 70 and pie breaks 15 and 25 so that signals can be sent thereto.

In the conventional spraying apparatus configured as described above, when performing spraying work, if the material is to be discharged from the material tank 1, the operator operates the operating device 6 to control the compressor 70 and the vibrator 15. The material is spouted from the nozzle by operating the nozzle at a predetermined strength and rotating the material feeding device 13 at a predetermined number of rotations using separate wiring.

Incidentally, the discharge amount per certain period of time and the optimum discharge pressure corresponding thereto differ depending on the physical properties of the material used. That is, when changing the material, the rotation speed of the rotary feeder and the pressure of the pumped air must be reset. Therefore, when switching to the material in the material tank 2 in the above device, the rotation speed of the material feeding device 23 can be set in advance;
The pressure of the pressurized air supplied by the pressurized gas source 70 must be readjusted when changing materials.

At this time, the actual change in the air pressure inside the pressure-feeding vibrator is slightly delayed from the time when the regulating valve is operated, although the degree of change varies depending on the distance from the regulating valve to the material receiving section, the pipe diameter, the mechanism of the regulating valve, etc. Therefore, rapid operation will cause the pressure to rise or fall too much, causing nozzle clogging and suffocation.

In order to prevent this, the air pressure must be adjusted slowly over a period of 8 to 15 seconds. During this time, both the material discharge condition and the discharge amount become unstable.
As a result, the state of mixing with water becomes non-uniform, resulting in a significant deterioration of the physical properties of the constructed body, particularly the non-uniform construction thickness, and increased dust generation and rebound.

The material spraying device according to the present invention has been developed to solve these problems.When spraying different types of materials, the material spraying device is capable of automatically switching between the materials in an appropriate state. The purpose is to obtain.

[Means for solving problems]

The material spraying device according to the present invention includes a plurality of material tanks, and a compressed air outlet for feeding the material into the pressure hose and a blowout port for opening and closing the material pressure feed near the discharge port at the bottom of each material tank. A shutter and a compressed air outlet for cleaning the pressure-feeding hoses are respectively provided, and a switching device is provided that merges a plurality of pressure-feeding hoses for each material tank into a single transport hose, and the switching operation of this switching device, It is equipped with an operation control means that controls in conjunction the time schedules of the operation of the rotary feeder of each material tank, the opening and closing of the compressed air for pressure feeding, the opening and closing of the shutter, and the opening and closing of the compressed air for cleaning. The means operates in response to a signal sent from a separately provided nozzle drive device.

[Effect]

In this invention, when the start button of the device is first pressed, the pressure feed hose of the first material tank is opened and cleaned by the switching device according to a time schedule preset in the operation control means based on a signal from the nozzle drive device. Following the opening of the air supply, the rotation of the rotary feeder, the opening of the shutter at the discharge port, and the opening of the material pressure air are activated to perform spraying for a certain period of time. After a certain period of time, the rotary feeder for this material tank is rotated, the discharge port shutter is opened, and the air for pressurizing the material is opened. The material is pumped at a preset discharge amount and pressure for each material, and is ejected from a nozzle via a conveyance hose.

〔Example〕

FIG. 1 and FIG. 2 show an embodiment of this invention.
Figure 1 is a schematic explanatory diagram showing the entire device, Figure 2 shows the operating time schedule of each device, la and lb are material tanks that store different materials, and 2a and 2b are provided at the bottom. Rotary feeder for material cutting, 3a
, 3b is a motor that rotates the rotary feeder, 4
a, 4b are material discharge ports of the material tank; 5a, 5b are air pipes for pressurizing the material; 6a, 6b are material discharge ports 4a, 4b.
Air outlet for pressurizing material opened nearby, 7a
, 7b is a shutter for opening and closing the material supply provided near the material discharge port, and is opened and closed by an electric signal. 8a,
8b is a cleaning air outlet provided at the inlet of the pressure feeding hoses 9a, 9b, and 10a, 10b are air piping thereof.

If, the pressure feed hoses 9a and 9b are combined to form the transfer hose 1.
2 is a changeover device connected to the transfer hose, and 13 is a nozzle for spraying material connected to the tip of the conveyance hose.

14 is a compressor 7, 15a, 1, which sends combined air to the air piping for pressure feeding and cleaning the materials.
5b is an automatic pressure feeding valve provided in the air piping for pressurizing the material; 16a and 16b are air pressure regulating valves; 17a;
17b is an automatic cleaning valve installed in the cleaning air piping;
Similarly, 18a and 18b are air pressure regulating valves. 19a
is an automatic opening/closing valve for switching provided on the pressure feed hose 9a, 1
9b is an automatic switching valve provided on the pressure feed hose 9b. 20 is a nozzle drive device equipped with the nozzle 13;
Spraying is performed automatically or by the operator.

Next, on the operation control panel, start ports 5022a, 22b, stop S ports 23a, 23b, and variable timer for starting cleaning are set at 248.
．． 24b5 Variable timer for stopping cleaning 25a, 25b (
Hereinafter simply referred to as [timer 24a1 timer 25b, etc.]
A material changeover selection switch 26, a timer 27 for the automatic switching valve 1'9a% 19b, and a timer 29 for delaying and stopping the automatic pressure feeding valve 15a or 15b are arranged. Below, 1a-18a is referred to as a lineage, 1
The operation of the embodiment will be described with b-18b being collectively referred to as the b system.

In the material spraying device configured as described above, first, before starting, the air pressure for pumping, the air pressure for cleaning, and the rotary feeder are adjusted according to the characteristics of each material used in the a system and b system. Adjust and set the rotation speed and time schedule of each timer, then press Compressor 1.
Start 4.

In the a system, by pressing the start button 22a, the automatic valves 17a and 19a are first opened, and the cleaning air outlet 8a is opened.
The remaining material in the pressure pipe 9a is transferred by the air blown from the 6a, and after a set time by the timer 248, the automatic valve 15a is opened to blow out the pressure air from the 6a, the shutter 7a is opened, and the automatic valve 17a is closed ( The automatic valve 19a of the switching device 11 is closed after a delay of the time set by the reclaimer 2 due to the stoppage of the operation of the A system.

When a material tank switching signal is issued from the nozzle drive device 20 after a predetermined time or when the spray reaches a predetermined location, the operation of the a system is stopped after the set time of the timer 29, and at the same time the b system is started. . At the same time, timer 2
Based on the time set in step 58, the automatic valve 17a for cleaning the pressure pipe of system a is opened. The operation of the b system is similar to that of the a system according to a preset time schedule, and after the spraying is finished, the timer 25b and the timer 28 are activated.
The pressure feed pipe 9b of system b is cleaned for the time set in . Furthermore, timers 29 and 24b, timers 25a and 27,
The timers 25b and 28 have the same set time.

Next, the material changeover selection switch 26 is used to select whether or not to switch between the a and b systems. When "Yes" is selected, the switch is automatically switched by a changeover signal from the nozzle drive device. That is, if system A starts first, the system automatically switches to system B, and if system B starts first, it automatically switches to system A.

In addition, 29 is the a from the nozzle drive device 20 as described above.
This is to set the time from inputting the switching signal from system B to system B until stopping the operating system A, but it operates in the same way when switching from system B to system A.

As is clear from Fig. 2, even if system b is started by the switching signal from the nozzle drive device, the rotary feeder 2b starts cutting out the material after the time set by the timer 24b, and the time lag is about 8 seconds. . Further, the automatic valve 19b of the switch opens at the same time as the switching signal, but the automatic valve 19a closes with a delay from the switching signal by the sum of the timer 29 and timer 253. This time lag is 2 seconds in this example.

According to the operation according to the time schedule described above, there is no need to adjust the air pressure during operation when changing the material tank, and the only difference from the ideal steady state is that a
When starting from the system, the automatic cleaning valve 17b is open for 1 second after the switching signal is input, and the automatic cleaning valve 17a is open for 1 second, for a total of only 2 seconds.

Note that these 2 seconds are the time for discharging the material from the starting point of the pressure pipe in system a to the switching on-off valve 19a, and for discharging the remaining material, if any, from the same valve 19b in system b. 2 in an abnormal state like
This occurs in about seconds, but there is almost no actual damage to the construction process, and the material can be changed smoothly.

By the way, in the above explanation, the case where the present invention is applied to a monolithic refractory material has been described, but it goes without saying that it can be applied to the spraying of other powder or granular materials.

Further, the present invention can be applied not only to the case of two material tanks but also to the case of three or more.

〔Effect of the invention〕

As explained above, this invention controls material switching selection, material cutting, and blowing of each compressed air at predetermined strengths and weaknesses according to a predetermined time schedule, even when the discharge amount and discharge pressure differ for each material. Materials can be changed smoothly, appropriately, and in a stable manner, and the discharge condition will not become unstable, preventing the occurrence of suffocation due to nozzle clogging.
This has the effect of enabling high-quality construction even in areas where materials are changed.

[Brief explanation of the drawing]

1 and 2 are general explanatory diagrams and operating time schedules for each device showing an embodiment of the present invention, and FIG. 3 is a general explanatory diagram of a conventional material spraying device. Figures 1 and 2
In the figure, 1a, 1b ---Material tank, 2a, 2b ---Rotary feeder, 3a, 3b ---Motor, 4a, 4b ---Material discharge port, 5a, 5 b----1 material pressure feeding air piping, 6a,
6b ---1.--Air outlet for pressure feeding, 7a,
7 b----1・Shutter, 8a, 8b---・---
-Air outlets for cleaning, 9a, 9b---
--- 1 pressure feed hose, tOa, 10 b - Cleaning air piping, 11 ・-・−・・・−・～・−・・−−
−−−All changers, 12 ・・・−・・・・・−・−・−
・−・−Transport hose, 13 ・−−−−−−−−−−
−−−・−・−・・−Nozzle, 14 ・・−・・−・−
...-----1-----Compressor, 15a
, 15b --- One pressure feed automatic valve, 16a, 16b
---- Single pressure feeding air pressure control valve, 17a, 17b
---- Automatic valve for cleaning, 18a, 18b -
---Air pressure control valve for cleaning, 19a, 19b ---
Automatic valve for complete replacement, 20 ・・〜・−・−・−−１−
-----・---- Nozzle drive device, 21---
1...---1---Operation control panel, 22a
, 22b ---111 start button, 23a, 23b ---1 stop button, 24a, 24b ---1 cleaning air open variable timer, 2
5a, 25 b ------1 Cleaning air close variable timer, 26...-----1--------------
・-Material selection switch, 27.28--11--
---Variable timer for switch, 29-・・−・−・−・
−・−−−−1−−Timer for delay stop. Agent Patent Attorney Kubo 1) Akira Hou

Claims (3)

[Claims] (1) Different types of materials are individually discharged from two to several material tanks each equipped with a rotary feeder at the bottom into a pressure feed hose, transferred to a conveyance hose connected to the pressure hose, and then transferred from a nozzle at the tip of this conveyance hose. In a material spraying device for spraying materials, each material tank is provided with a pressure-feeding air outlet, a shutter, and a cleaning air outlet near the outlet at the bottom of each material tank, and the tip of each of the pressure-feeding hoses is connected to a single conveyance hose. It is equipped with a switching device that merges the two, and inputs signals from the nozzle drive device to switch the pressure hose in the switching device, rotate and stop the rotary feeder, open and close the pressure air, open and close the shutter, and open and close the cleaning air. Material spraying equipment equipped with operation control means that interlocks and controls time schedules. (2) The material spraying apparatus according to claim (1), wherein the operation control means is realized by a variable timer and an automatic opening/closing valve. (3) Claim (1), wherein the operation control means adjusts and sets the rotational speed of the rotary feeder, the air pressure for pumping, and the air pressure for cleaning in advance for each material stored in each material tank. and the material spraying device according to item (2).