JPH025896Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention mixes powdery raw material, which is pressure-fed from a spraying machine, etc., and liquid raw material inside a spray nozzle, and sprays the mixture. This relates to a spraying device for spraying onto surfaces, and in particular, it has been improved to automatically control the blending ratio of raw materials and the feeding pressure of liquid raw materials according to the feeding amount of powdery raw materials. This relates to a spraying device.

[Conventional technology] Conventionally, various construction methods have been used to line blast furnace gutters and hot metal containers, such as construction with refractory bricks, stamp construction, pouring construction, vibration molding, and slinger construction. In order to shorten the time and reduce costs, pour-in construction is the main method.

However, pouring construction is complicated because it involves mixing monolithic refractories using a large mixer at the construction site and framing work, and it also has the disadvantage of long curing and drying times before removing the frames. cannot be said to be sufficient.

On the other hand, spraying is a construction method that solves the problems of these pouring construction methods, but powder-like, monolithic refractory material is force-fed to the spray nozzle of a spraying device, and then mixed with water and sprayed. In the case of the conventional spraying method, the construction moisture content is 15 to 20%, and the packing density of deposits is low, so durability is inferior to pouring construction (4 to 8% construction moisture), and the adhesion rate is low. There are problems such as poor performance, and currently it is only used to repair locally damaged areas.

In order to reduce construction moisture during spraying construction, various studies were conducted on the particle size of the sprayed monolithic refractory material, effective pattern selection, nozzle shape, etc., and as a result, a patent application previously proposed by the applicant in 1982 was made. Using the "refractory composition for spraying construction" described in Specification No. 192572, coarse particles and fine particles consisting of particle size-adjusted fire-resistant aggregate and quick-hardening agent, and the remainder of the fire-resistant aggregate (fine powder) are prepared. part), a slurry-like fine powder part (hereinafter referred to as slurry solution) consisting of a liquid binder, a deflocculant, and a small amount of water.
A spraying method has been developed in which the materials are mixed and sprayed using a spray nozzle, and it has become possible to achieve the same high quality with pouring construction as with pouring construction.

[Problems to be solved by the invention] However, in the same way that the conventional spraying method involved observing the dust generation state with the naked eye during spraying construction and adjusting the amount of water added, This new spraying method involves mixing and spraying the coarse and fine particles of the spraying material that are pumped from the spraying machine with the slurry solution that is pumped from the pressure tank.
The amount of slurry solution added is adjusted by visually observing the state of material being discharged from the tip of the spray nozzle and manually operating a flow rate adjustment valve installed in the middle of the slurry solution supply pipe. Therefore, the quality of the constructed body varies due to individual differences in visual observation.
In addition, when the flow rate adjustment valve is operated, the fluid pressure after the flow rate adjustment valve changes, which changes the slurry solution jetting speed from each slurry solution jetting hole provided in the spray nozzle.If the jetting fluid pressure is insufficient, In this case, the amount of slurry solution ejected becomes uneven depending on the position of the slurry solution injection hole, and the mixing ratio of coarse particles and fine particles fed from the spraying machine changes, which affects the quality of the construction work. There are problems such as causing problems.

[Means for solving the problem] The present invention was made with the aim of solving the above problem, and it is possible to solve the problem by solving the problem. The feed amount of liquid raw materials such as slurry is automatically adjusted according to the feed amount of the slurry. Further, the jetting pressure of the liquid raw material into the nozzle derived from the adjustment of the liquid raw material feeding amount is automatically adjusted, and the liquid raw material is configured to be always jetted into the nozzle at the required pressure. It is something.

The structure of the present invention will be schematically explained with reference to the drawings. As shown in FIG. A feeding device B for powdery raw material to the nozzle; A feeding device C for liquid raw material to the nozzle; A means D for detecting the feeding amount of the powdery raw material fed to the nozzle; Supply to the nozzle A liquid raw material feed amount adjusting means F, which is a liquid raw material flow rate adjusting valve having a valve opening degree adjusting means E, and a liquid raw material flow rate adjusting valve installed downstream of the liquid raw material flow rate adjusting valve than the liquid raw material flow rate adjusting valve. A target feed amount of the liquid raw material is set in accordance with the outputs of the pressure detection means G, the pressure adjustment means H for the liquid raw material supplied to the nozzle, and the feed amount detection means for the powdery raw material, and the feed rate is adjusted accordingly. liquid raw material feed rate adjusting means for calculating the valve opening degree corresponding to the amount and outputting a valve opening degree adjusting signal to the valve opening degree adjusting means; Setting a target liquid pressure of the liquid raw material supplied to the nozzle, comparing this target liquid pressure with the liquid pressure detected by the pressure detection means, and outputting a liquid pressure correction signal corresponding to the comparison result to the pressure adjustment means. and a control device equipped with a hydraulic pressure correction means.

In the present invention, a feeding amount detection means J of the liquid raw material fed by the liquid raw material feeding device C is further provided, and a valve opening degree adjustment for adjusting the liquid raw material feeding amount of the control device I is provided. Means E compares the detected liquid raw material feed amount with a preset target feed amount,
Based on this comparison result, a valve opening adjustment signal may be output to the adjustment means E for adjusting the amount of liquid raw material fed.

Therefore, the spraying device of the present invention is suitable for application to the spraying method for refractories, the spraying method for civil engineering work using cement, etc., as described later, and the spraying device is suitable for use in the spraying method for refractories and civil engineering work using cement, etc. Various combinations are possible, such as: coarse particles and fine particles of the above-mentioned spray material and slurry solution, monolithic refractories and water, cement and sand and water, etc.

In the present invention, as a feeding device for powdery raw material, it is preferable to provide a bridging prevention device in the spraying machine as described in Japanese Patent Application Laid-open No. 58-43386, and also Although it is possible to use a device that detects the material output amount and controls the operation of the delivery device according to the detected material output amount to maintain the material output amount of the spraying machine at a set value, other devices may be used. Structure: For example, a feed wheel type quantitative delivery device is installed at the bottom of the material tank, and the discharge amount of coarse particles and fine particles can be adjusted by adjusting the rotation speed of the feed wheel and the pressure of compressed air. Any commercially available open type or closed type may be used as long as it is mounted on top and the instantaneous discharge amount can be calculated.

As a feeding device for the liquid raw material, an ordinary pump, a slurry pump, a pressure tank equipped with pressurizing means, or the like is used.

Further, a normal computer device may be used as the control device.

For example, READ and WRITE capable RAM stores various information as a volatile memory element, ROM stores processing programs, etc., and data can be imported from the outside (each detection means) through an input device.
A well-known microcomputer equipped with a CPU, etc. that performs arithmetic processing while exchanging data with RAM, and outputs control signals to flow rate and hydraulic pressure adjustment means via an output device as necessary. Can be used.

[Operation] The feed amount of the powdery raw material fed from the powdery raw material feeding device B is detected by the detection means D and inputted to the control device I. The control device I performs arithmetic processing based on this detected value, calculates a target value for the feed rate of liquid raw material corresponding to the feed rate of powdery raw material, and changes the control signal to the valve opening so that this target value is achieved. Output to control means E.

In the present invention, the detection signal from the liquid raw material feed amount detection means J is input to the control device I, and the control device I detects the detected liquid raw material feed amount and
The target feeding amount of liquid raw material set as described above may be compared, and a valve opening adjustment signal may be output to the valve opening adjustment means E based on the comparison result.

Therefore, when the flow rate adjustment valve F of the liquid raw material is operated, the liquid pressure on the downstream side of the liquid flow from the adjustment valve F changes, and the jetting speed of the liquid raw material jetted within the spray nozzle A changes. The blending ratio of the powdery raw material fed from the powdery raw material feeder B changes, which affects the quality of the construction body.

Therefore, in the present invention, the detection means G further detects the liquid pressure of the liquid raw material sprayed into the spray nozzle A.
and inputs this detection data to the control device I. The control device I processes this detection data,
The pressure regulating means H is controlled so that the liquid raw material is sprayed into the spray nozzle A at a predetermined pressure.

[Embodiment] FIG. 2 is a diagram schematically showing an embodiment of the present invention.

In FIG. 2, reference numeral 1 denotes a spraying machine, and a discharge port 2 of the spraying machine 1 is connected to a spraying nozzle 4 via a tube 3 for supplying coarse particles and fine particles. Reference numeral 5 denotes a measuring instrument, on which the spraying machine 1 is mounted. Measuring instrument 5
For example, it is equipped with a digital weight indicator 5a, and the amount of coarse particles and fine particles delivered from the spray machine 1 to the spray nozzle 4 can be measured by this weight indicator 5a.

In the middle of the slurry solution supply pipe 7 that connects the pressure tank 6 containing the slurry solution and the spray nozzle 4, there is a flow meter 8 that measures the flow rate of the slurry solution that is force-fed from the pressure tank 6 to the spray nozzle 4. Flow rate adjustment valve 9 that adjusts the flow rate of slurry solution
A variable speed motor 10 is provided as a means for adjusting the opening degree of the flow rate regulating valve 9. By driving this variable speed motor 10, the flow rate adjustment valve 9 can be operated and the opening degree can be controlled.
This ensures a stable supply of slurry solution to the spray nozzle 4.

FIG. 3 shows an example of the spray nozzle 4 employed in the present invention in a longitudinal sectional side view. In the illustrated example, the spray nozzle 4 has a rotating body 13 that surrounds a nozzle body 11 and forms a liquid chamber 12, and is watertightly and slidably attached thereto. 14 is an O-ring;
15 is a bearing. A large number of slurry solution outflow holes 1 are provided on the inner peripheral surface of the liquid chamber 12 of this rotating body 13.
6 are perforated in a centripetal manner. Further, a slurry solution supply pipe 7 is connected to the liquid chamber 12, and a pressure gauge 17 is attached thereto. A large number of slurry solution ejection holes 18 are perforated in a centripetal manner in the nozzle body 11, and arranged and assembled so that the center line of the example of the slurry solution outflow holes 16 and the center line of the row of slurry solution ejection holes 18 coincide with each other. It is being

Further, a variable speed motor 19 is fixedly installed in the nozzle body 11 as a means for adjusting the pressure of the slurry solution.
The rotating body 13 is slidably rotated with respect to the nozzle body 11 by a belt or a chain suspended on a pulley 9. By driving the variable speed motor 19 to slide and rotate the rotating body 13 and adjusting the degree of overlap between the slurry solution outflow hole 16 and the slurry solution injection hole 18, the amount of slurry ejected from the slurry solution injection hole 18 can be adjusted. is adjusted.

That is, when the rotational speed of the variable speed motor 19 is increased and the time period during which the outflow hole 16 and the ejection hole 18 overlap each other is shortened, the hydraulic pressure increases. (If the time for each overlap between the outflow hole 16 and the ejection hole 18 is long, the liquid pressure released during that time will increase,
This is because the drop in hydraulic pressure accompanying the jetting of the slurry solution becomes large. ) Therefore, it is possible to change the fluid pressure by adjusting the rotational speed of the variable speed motor 19, which keeps the fluid pressure after the flow rate control valve 9 constant and allows the slurry solution to be ejected at a predetermined jetting speed. It will be ejected into the nozzle body 11.

It goes without saying that other known means may be used for the transmission mechanism between the variable speed motor 19 and the rotating body 13.

FIG. 4 shows a block diagram of the control system in this embodiment. In FIG. 4, parts corresponding to those in the apparatus of FIGS. 2 and 3 are designated by the same reference numerals. Block 21 is a computer device that constitutes a control circuit device that is the essential part of the present invention.

To explain the operation of the device shown in Fig. 4,
The instantaneous discharge amount of the coarse particles and fine particles discharged from the spraying machine 1 by the quantitative delivery device is calculated by the weight display 5a of the measuring device 5, and the weighing data is input into the computer device 21. On the other hand, the discharge amount of the slurry solution discharged from the pressure tank 6 is measured by the flow meter 8, and the measurement data is input into the computer device 21. The computer device 21 processes this measurement data to determine whether the amount of slurry solution discharged from the pressure tank 6 is a predetermined mixing ratio that matches the amount of coarse particles and fine particles discharged from the spraying machine 1. If the discharge amount of the slurry solution does not match the predetermined mixing ratio that matches the discharge amount of coarse particles and fine particles, the computer device 21 sends a control signal to the variable speed motor 10 that operates the flow rate regulating valve 9. The variable speed motor 10 operates the flow rate adjustment valve 9 to control the opening degree of the flow rate adjustment valve 9 to compensate for fluctuations in the flow rate of the slurry solution.

At this time, when the flow rate adjustment valve 9 is operated, the liquid pressure after the flow rate adjustment valve 9 changes, and the speed at which the liquid reaches the rotating body 13 having the liquid chamber 12 changes. As the spraying speed of the solution changes, the blending ratio of the coarse particles and fine particles fed from the spraying machine 1 changes, which affects the quality of the construction body.

Therefore, the liquid pressure in the liquid chamber 12 is detected by the pressure gauge 17, and the detected data is input to the computer device 21. The computer device 21 processes this detection data and determines whether the fluid pressure in the fluid chamber 12 is within the permissible range. If the fluid pressure fluctuates beyond the permissible range, the computer device 21 controls the rotating body 13 A control signal is sent to the variable speed motor 19 that slides and rotates, and the variable speed motor 19 slides and rotates the rotating body 13 to adjust the opening degree of the slurry solution jet hole 18 so that the fluid pressure is constant. Coarse particles, which are force-fed from the spraying machine 1, are controlled by following the opening degree of the
A slurry solution is added to the fine grain member at a constant rate set according to its quality.

Next, an example of control in the apparatus of the above embodiment will be described in more detail with reference to a flowchart.

In FIG. 5, in step 51, a signal from the measuring device 5 is inputted to read the feeding amounts of coarse particles and fine particles (powder-like raw material). Then, in step 52, a target feeding amount of the slurry solution (liquid raw material) is calculated and set, and a target hydraulic pressure in the liquid chamber 12 is calculated and set. Next, the output signal of the flow meter 8 is input, and the feed rate of the slurry solution is read (step 53). Next, the target feed rate of the slurry solution set in step 52 and step 53
The actual feed amount read in is compared with the actual feed amount read in (step 54). If the actual slurry solution feed rate is within the target value or target range, step 56
Move to. If the actual feed rate of the slurry solution deviates from the target range, the process moves to step 55, where the target opening degree of the flow rate adjustment valve 9 is calculated, and based on this calculation result, the rotation speed change signal is changed to a variable speed. The output is output to the motor 10 to adjust the feed rate of the slurry solution.
From step 55, the process returns to step 53, and it is confirmed whether the adjusted slurry solution feed rate is within the target range (step 54).

In step 56, the output signal of the pressure gauge 17 is input, and the hydraulic pressure of the slurry solution is read. Then, the target hydraulic pressure set in step 52 and the actual hydraulic pressure read in step 56 are compared (step 57), and if the actual hydraulic pressure deviates from the target hydraulic pressure by more than a predetermined value, In step 58, a rotation speed change signal for adjusting the hydraulic pressure is output to the variable speed motor 19. And step 5
Return to step 6 and read the adjusted hydraulic pressure, then proceed to step 5.
In step 7, it is confirmed whether the hydraulic pressure has reached the target hydraulic pressure. If the hydraulic pressure reaches the target hydraulic pressure, proceed to step 5.
Return to 1.

Although not shown in the drawings, in the present invention, the discharge amount of coarse particles and fine particles can be arbitrarily set in advance using the computer device 21, and the injection pressure and injection time of the spraying material can be set in advance. It is also possible to enable automatic selection. In addition, the amount of slurry solution added is automatically controlled at a predetermined mixing ratio according to the amount of coarse particles and fine particles discharged from the spraying machine 1. Without using the flow meter 8, the computer device 21 stores the relationship between the flow rate of the slurry solution for each quality, the flow rate adjustment valve 9, and the opening degree,
Based on this, it is also possible to automatically control the amount of slurry solution added to a predetermined blending ratio.

[Effects] As detailed above, the present invention is configured to automatically adjust the amount of liquid raw material fed and its liquid pressure with respect to the amount of powdery raw material fed to the spray nozzle. This is what I did. Therefore, according to the present invention, the blending ratio of the powdery raw material and the liquid raw material is stabilized, and it is possible to perform spray lining with stable and homogeneous quality.

In addition, this invention automatically adjusts the feed rate and pressure of raw materials, so there is no need for specialized knowledge or skills for spraying work, and anyone can easily carry out spraying work. Construction work that conventionally required three workers can now be performed by two or fewer workers, resulting in significant labor savings.

In addition, by installing a control device, it is also possible to automatically record and save construction data, which has great practical effects such as making it possible to adequately manage quality.

[Brief explanation of drawings]

Figure 1 is a block diagram showing the overall configuration of the present invention.
FIG. 2 is a system diagram showing an embodiment of the present invention, FIG. 3 is a partial sectional view showing the configuration of the spray nozzle 4, FIG. 4 is a block diagram explaining the control system in the embodiment, and FIG. FIG. 5 is a flowchart illustrating a control method in the same embodiment. 1... Spraying machine, 2... Discharge port, 3... Coarse particles,
Fine grain member supply pipe, 4... Spraying nozzle, 5...
Measuring device, 5a... Weight indicator, 6... Pressure tank, 7... Slurry solution supply pipe, 8... Flow meter,
9...Flow rate adjustment valve, 10...Variable speed motor, 11
... Nozzle body, 12 ... Liquid chamber, 13 ... Rotating body, 14 ... O ring, 15 ... Bearing, 1
6... Slurry solution outflow hole, 17... Pressure gauge, 1
8... Slurry solution ejection hole, 19... Variable speed motor, 20... Pulley, 21... Control device (computer device).

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A spray nozzle that mixes and sprays supplied powdery raw materials and liquid raw materials inside the spray nozzle, a device for feeding the powdery raw materials to the nozzle, and the nozzle. a feeding device for liquid raw material to the nozzle; a means for detecting the feeding amount of the powdery raw material fed to the nozzle; a liquid raw material flow rate regulating valve having a regulating means; a liquid raw material pressure detecting means installed downstream of the liquid raw material flow rate regulating valve in the liquid raw material distribution; a liquid raw material pressure regulating valve supplied to the nozzle; A target feeding amount of the liquid raw material is set in accordance with the output of the feed amount detection means for the powdery raw material, a valve opening corresponding to the feeding amount is calculated, and a valve opening adjustment signal is used to adjust the valve opening. A target hydraulic pressure of the liquid raw material to be supplied to the nozzle is set in accordance with the output of the liquid raw material feed rate adjusting means and the powder/granular raw material feed rate detecting means, and this target liquid pressure and the above and a control device equipped with a hydraulic pressure correction means for comparing the hydraulic pressure detected by the pressure detection means and outputting a hydraulic pressure correction signal corresponding to the comparison result to the pressure adjustment means. Spraying equipment. (2) It has a feeding amount detection means of the liquid raw material fed from the liquid raw material feeding device, and the liquid raw material feeding amount adjusting means of the control device is configured to match the set target feeding amount. A comparison calculation is made with the detected feed amount, and the opening adjustment signal is output to the valve opening adjustment means based on the calculation result.
Spraying equipment as described in section.