JPS6138668Y2 - - Google Patents

Description

[Detailed explanation of the idea]

(Technical field) The present invention relates to a crusher that crushes coarse lumps contained in sprayed plastic refractories into particles of a certain size or less, and continuously supplies a fixed amount of the particles to a spraying machine. It is. (Prior art) Recently, a spraying method for plastic refractories has been developed as a new construction method for monolithic refractories.
Examples include "Unexamined Japanese Patent Publication No. 57-73388, Construction Method for Plastic Refractories" and "Unexamined Japanese Patent Publication No. 57-73388, Construction Method for Plastic Refractories"
197061, "Plastic Refractory Spraying Machine" is disclosed. In general, plastic refractories are made by mixing several types of refractory raw materials, such as refractory aggregate and fireclay, and kneading the mixture with water and a binder, so it has a very high viscosity. If a conventional wet spraying machine that sprays the cement mixture was used as it is, the material would adhere to the inside of the discharge hose and cause clogging, making spraying impossible. Therefore, in order to make spraying possible, it was necessary to make special improvements to the material and spraying machine. That is, the material is prepared in advance into a granular material having an appropriate viscosity so as to be suitable for spraying at the construction site. On the other hand, spray machines have a relatively long rising straight section on the discharge hose in order to provide the necessary kinetic energy to the material being transferred through the discharge hose along with the compressed air, and a curved section that extends beyond the straight section. The target is to have a large radius of curvature to lower the flow resistance. As described above, continuous spraying of plastic refractories has become possible by preparing the material in the form of granules in advance and using a spraying machine with a discharge hose with special features. However, although the material is prepared in the form of granules in advance as described above, in order to give the material itself appropriate viscosity, during kneading during material preparation,
The material particles adhere to each other and aggregate to form small lumps. Furthermore, when materials are piled up during storage after preparation or during transportation to a construction site, the material particles located at the bottom often stick to each other under the load of the material above, and solidify into large clumps. As is well known, spraying involves transporting materials by suspending them in a stream of compressed air flowing at high speed through a hose.
Since the material is ejected from the spray nozzle together with air to construct walls, etc., it is desirable that the material used for spray construction be in the form of powder, and large lumps cannot be transported within the hose (generally, The maximum particle size during transportation is said to be less than 1/2 of the inner diameter of the hose). Therefore, it is necessary to crush the coarse lumps that are unavoidably generated during material production, storage, and transportation prior to spraying and reduce them to an appropriate particle size before feeding them to the spraying machine. FIG. 1 schematically shows a conventional spraying method for plastic refractories and its equipment. In Fig. 1, 1 is a conveyor hopper, 2 is a vibrating screen, 3 is a vibrator, 4 is a belt conveyor, 5 is a spray machine, 6 is the material input hopper, and 7 is a series of circular movements by a rotating shaft 8. 9 is a drive motor, 13 is an air compressor 10 is a material discharge hose, which has a relatively long rising straight part 10a to give momentum to the material discharged with compressed air, and to reduce flow resistance. The curved portion 10b has a relatively large radius of curvature. 11 is a spray nozzle, and 12 is a fireproof wall constructed by spraying. In such conventional examples, the material is first passed through a vibrating screen 2 with a mesh of an appropriate size in order to make the material suitable for spraying, and any large lumps that do not pass through this are manually crushed and passed through. . Therefore, it was very time consuming and inefficient.
In addition, since particles of plastic refractories during spraying are slightly sticky, if a large amount of material is poured into the hopper 6 of the spraying machine and the material accumulates in the hopper, so-called arching occurs within the hopper 6. bridging phenomenon) occurs and the material stops coming down, and as a result, the material does not bend to the material cut-out device located below the spray machine, that is, the circulation pocket group 7 that sequentially goes below the hopper, making it impossible to feed the material. . In order to prevent this, it is necessary to continuously supply a fixed amount of material to the spray machine in accordance with the material cutting (discharging) capacity of the circulation pocket group. Conventionally, the material passed through the vibrating screen 2 is received onto the belt conveyor 4, and the operator of the spray machine operates and stops the belt conveyor 4 while observing the material cutting situation inside the spray machine, thereby increasing the amount of material supplied. It took a lot of time because I had to adjust it. In addition, due to errors in operation or monitoring, too much material is supplied, causing arching in the hopper of the spraying machine and making it impossible to discharge the material.In each case, the arching in the hopper must be manually broken down. Conventional methods and devices require a great deal of effort and effort, such as the need to clean the inside of the spray machine. (Purpose of the invention) The present invention solves the above-mentioned problems of the conventional method.The purpose of this invention is to crush the coarse lumps in the material for spraying plastic refractories to a particle size below a certain size suitable for spraying construction, and to To provide a crusher that continuously supplies the powder to the spray machine in synchronization with the discharge capacity of the spray machine. Hereinafter, embodiments will be described in detail based on the drawings. (Example) Figure 2 shows an example of the present invention.
Figure a is the XX cross section of figure c, figure b is the Y-Y cross section of figure c.
Each cross section is shown. In Figure 2, 2
1 is a hopper into which plastic refractories are placed, 2
2, two rotating shafts are provided in the middle part of the hopper 21, passing through the opposing side walls, and each rotating shaft has a plurality of rod-shaped rods protruding radially at a plurality of locations at a required interval. This is an agitator with an arm that rotates to prevent arching of the material. 23 is Hopper 21
2 parallel to the rotation axis of the agitator 22.
A crushing blade is provided with a book rotation shaft, and a plurality of radially protruding blades are provided at multiple locations on this rotation shaft at regular intervals,
By rotating this, coarse lumps in the material are crushed into particles of a certain size or less, and a fixed amount of the particles is continuously discharged. 24 is a scraper that scrapes off material stuck between the crushing blades, 25 is an agitator 2
2 and a drive motor for rotating the crushing blade 23, 28 a transmission, and 29 a chain serving as a power transmission mechanism connecting the agitator 22 and the crushing blade 23. In such a configuration, the material is initially introduced into the hopper 21 through the coarse screen 26, and is sequentially pushed downward by the rotation of the agitator 22 without forming an arch. Here, the coarse lumps in the material are crushed by the crushing blade 23 into particles of a certain size or less, and a certain amount of material according to the rotational speed of the crushing blade 23 is continuously discharged. The amount of material discharged can be arbitrarily adjusted by changing the rotational speed of the crushing blade 23 using the transmission 28. Furthermore, the hopper 21 can be divided as appropriate by providing a partition plate 27, and when different materials are put into the divided hoppers, each material can be simultaneously discharged at a constant rate. For example, when spraying, some material bounces off the wall, so-called rebound, which occurs to some extent.
This can be mixed into new materials at a certain rate and recycled effectively. The materials simultaneously discharged at a fixed rate are directly put into the spray machine, and are naturally mixed while passing through the discharge hose to become a homogeneous material, which is then sprayed onto the wall. Note that separate drive motors may be provided for the agitator 22 and the crushing blade 23, but if a power transmission mechanism such as a chain or gear is used as in the embodiment, only one drive motor is required. FIG. 3 shows an example in which the crusher of the present invention is applied to a plastic refractory spraying unit. Note that the same reference numerals as in FIGS. 1 and 2 indicate the same components. In the figure, 15 is a crusher according to the present invention, and 16 is an air compressor 13.
A compressed air control device 17 disposed in the middle of an air pipe guiding compressed air from the blowing machine 5 to the crushing machine 1
5. It is a centralized control panel that distributes drive power to the belt conveyor 4, spray machine 5, and compressed fireproof control device 16, respectively, and controls the operation and stopping of these devices. These devices are mounted on one truck 18 and compactly assembled to form a plastic refractory spraying unit. In the crusher 15, the coarse lumps contained in the material are crushed as described above, and a certain amount of the material is continuously discharged. It is put into hopper 6. The amount of the input material is adjusted to be the same as the discharge amount of the sprayer 5, so that the material does not form an arch in the hopper 6, and the pockets 7 that come around in sequence at the bottom of the hopper 6 are is supplied to The pocket supplied with material moves to the discharge section,
The compressed air blown from the air compressor 13 is passed through the discharge hose 10 to the spray nozzle 11.
is injected from. Note that the compressed air control device 1 is arranged in the air pipe 31 that connects the air compressor 13 and the spray machine 5.
Reference numeral 6 includes a control valve 32, a drain separator 33 for collecting and removing moisture and mist contained in compressed air, and the like. A series of spray operations by each of the devices, including start and stop operations, are automatically and centrally controlled by a central control panel 17. The following table compares the number of workers required to spray plastic refractories according to the application example described above with that of the conventional example.

【table】

[Table] (Effects of the invention) As explained above, the invention has the following effects. 1 As is clear from Table 1, the number of required workers has been reduced, making it possible to achieve significant labor savings. 2. Since the amount of material supplied can be completely synchronized with the discharge capacity of the spraying machine, there will be no trouble during the work, and therefore lost time will be reduced. 3 Coarse lumps and fine particles mixed in the material are crushed to a certain particle size or less while being pressed by the mutually interlocking crushing blades, so the material is kneaded again and slightly Since the viscosity increases and the material has a constant viscosity, it is continuously supplied, resulting in better adhesion to the wall surface. 4. By applying a crusher, it became possible to unitize the plastic refractory spraying equipment, making the entire equipment more compact and enabling sequence control in which each piece of equipment cooperated to perform a series of spraying operations. 5. Variations in the spraying condition (adhesion condition) due to differences in the material condition before use (more or less coarse lumps, length of storage period, amount of moisture, etc.) are reduced, improving the performance of the constructed fireproof wall, and , the amount of material rebound (rebound loss) during spraying has been significantly reduced. The crusher according to the present invention can be widely applied not only to plastic refractory spraying equipment but also to crushing and quantitatively supplying coarse lumps of similar materials.

[Brief explanation of drawings]

Fig. 1 is a block diagram of a conventional plastic refractory spraying device, Fig. 2 is a block diagram of an embodiment of the present invention, and Fig. 3 is a plastic refractory spraying unit to which the crusher of Fig. 2 is applied. FIG. 15...Crushing machine, 21...Hopper, 22...
Agitator, 23... Crushing blade, 24... Scraper, 25... Drive motor, 26... Screen, 27... Partition plate, 28... Transmission, 29
...Chain.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A hopper into which materials such as plastic refractories are fed, and one or more rotating shafts provided in the middle of the hopper each having a plurality of arms and rotating. an agitator that prevents arching of the material; and a crushing blade that is provided at the lower end of the hopper and has a plurality of blades each on a plurality of rotating shafts, and that crushes coarse lumps in the material by rotating. , consists of a scraper that scrapes off the material stuck between the crushing blades, and a drive motor that rotates the agitator and crushing blades, respectively, and scrapes the coarse lumps contained in the material fed into the hopper into constant particles. A crusher characterized by crushing materials into pieces smaller than the diameter and continuously discharging a certain amount of material determined according to the rotational speed of the crushing blade. (2) The agitator and the crushing blade are connected by a power transmission mechanism such as a chain or gear, and are rotated in conjunction with one drive motor. The crusher according to item 1. (3) The scope of the utility model registration claim, characterized in that the crushing blade is connected to a drive motor via a speed change mechanism, and the amount of material discharged is made variable by adjusting the speed change mechanism. The crusher according to item 1 or 2. (4) The hopper is equipped with a partition plate having a length from the upper edge to near the lower crushing blade, and different materials are charged into the divided hopper and each material is divided into a certain amount. The crusher according to claim 1, which is a utility model, and is characterized in that the crusher is discharged at the same time at a certain ratio.