JPS592579B2 - Multi-head air spray gun device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves coating the inner surface of a cylindrical metal frame such as a metal frame for centrifugal force casting with various coating agents in the form of a slurry.
The present invention relates to the provision of a new air spray gun device that solves various problems that occur in conventional means and allows complete coating to be obtained.

As is well known, when coating the inner surface of a metal frame that is entirely cylindrical, such as a metal frame for centrifugal casting, depending on the scale of the metal frame, slurry is simultaneously applied using multiple spray guns. A multi-head spray gun device is used to spray and apply a mold coating agent onto the inner surface of a preheated and rotated metal frame.

However, in the conventional multi-head spray gun device of this type, a plurality of spray guns are arranged in series parallel to the axial direction of a cylindrical metal frame, and a trough for pouring metal into the metal frame is used to fill the cylinder. The spray gun is moved over the entire length of the metal frame, and the inner surface of the metal frame is sequentially coated as it is preheated and rotated. In order to spray a fixed amount of mold coating agent in a short period of time, which is determined by the scale and casting product, a large number of spray guns are necessary. For this reason, the more spray guns there are, the longer the trough must travel in order to pull out the spray gun device (including the coating material piping, etc. attached in Appendix 5) from the metal frame. , it takes time and effort to operate, and the arrangement spacing of each spray gun,
If the moving speed of the trough and the rotational speed of the metal frame are not controlled correctly, the coating agent sprayed from the spray gun and successively coated on the rotating inner surface of the metal frame as the spray gun device advances will become spiral. Furthermore, if the spray guns are lined up in series parallel to the axis of the metal frame, the spraying surfaces of each will be slightly
5. Wrap it dry, or at least leave it at an appropriate interval so that there are no gaps, so when spraying, the splashes and water vapor will adhere to the adjacent spray gun, and this will turn into water droplets and drip onto the surface of the coated film. , a "cat's footprint"-like adhesion trace is produced, which causes defects and problems such as the formation of unevenness on the surface of the subsequent zero casting product. The present invention solves these drawbacks and problems by arranging a large number of spray guns. It is a device consisting of a plurality of spray guns for coating a mold with a molding agent, etc., and the plurality of spray guns arranged in the circumferential direction inside the metal frame are not visible from the inner surface of the cylindrical metal frame. They are equidistant and are arranged in a positional relationship that starts with the gun at the center in the axial direction and gradually retreats to the guns on both left and right sides in the circumferential direction.

The present invention will be described in detail below with reference to the illustrated embodiments. Fig. 1 is a front view of a multi-head spray gun device of the present invention, and Fig. 2 is a side view of the same. In both figures, 1 is a cylindrical body for centrifugal casting, for example. 1a shows the inner surface of the metal frame 1, that is, the inner surface of the metal frame to be coated with a molding agent, etc., 3 is the spray gun device of the present invention, and 4a to 4
4e is a spray gun (the example in the figure shows five spray guns, but it goes without saying that this number can be increased or decreased as appropriate depending on the size of the metal frame, etc.), and in the present invention, Multiple spray guns 4a, 4b, 4c, 4d
, 4e are first arranged in parallel in the circumferential direction of the mold inner surface 1a, and at this time, the respective spray guns 4a to 4e are arranged radially so that they are all approximately equidistant from the mold inner surface 1a. At this time, the spray guns 4a to 4e are not perpendicular to the inner surface 1a, but are tilted slightly forward as shown in the figure, for example, at an angle of incidence of about 60 to 70 degrees. It is held in position. What is more important is that the spray guns 4a to 4e are not parallel to each other on the same line in the circumferential direction, but as is clear in FIG.
4e is shifted in the front-back direction. That is, in FIG. 1, the spray gun 4c at the center position is the furthest forward in the axial direction, and as it reaches both left and right sides in the circumferential direction,
Spray guns 4b, 4a1 and spray guns 4d, 4e
Therefore, there is a difference of j in the axial direction between the spray gun 4c at the front end and the spray guns 4a, 4e at the rear end, as shown in the second figure. Therefore, as shown in FIG. Even when viewed from a perspective view, due to the longitudinal shift in the axial direction, the arrangement appearance appears as if they are lined up on different arcuate wire openings. FIG. 4 shows a case where there are six spray guns, and in this case, the guns at the central position in the present invention refer to 4c and 4c' in the same figure. Each of these spray guns 4a
4e, the target slurry-like coating is applied from the coating material supply source pipe 5 and the air supply source pipe 6 through the slurry copper pipe 7 and the air copper pipe 8, respectively, as in the conventional spray gun device. A molding agent and pressurized air are supplied, and as these are well known, they will be omitted, and the positional relationship of the spray guns 4a to 4e will be maintained by the lengths of the copper pipes 7, 8, etc. . Further, although not shown in the drawings, in the present invention, the spray guns 4a to 4e1 and the main pipes 5, 6, copper pipes 7, 8, etc., are made of metal materials, such as rubber or plastic. By covering the entire surface with a sheet material that has good waterproof, water-resistant, and heat-insulating properties, water vapor and repellent coating agents will adhere to each outer surface of the metal part, and the water will turn into water droplets and cause metal damage. It is also possible to prevent the liquid from dripping onto the inner surface 1a of the frame. Further, the axial movement of the spray gun device 3 within the metal frame 1 is carried out using a trough or the like as in the prior art. According to the spray gun device 3 of the present invention, the metal frame 1
is preheated and rotated, and the required slurry coating agent is injected from each spray gun group 4a to 4e together with pressurized air to coat the mold inner surface 1a. At the same time, the entire surface of the inner surface 1a is coated with the rotation of the mold 1. At this time, in the present invention, each of the spray guns 4a to 4e extends in the circumferential direction of the inner surface 1a of the metal frame, and in each case, the spray guns 4a to 4e cover the inner surface 1a and the inner surface 1a. Since the spray guns 4a to 4e are arranged radially at equal distances, the trough movement distance for extracting the device 3 out of the metal frame 1 is short, and each spray gun 4a to 4e is arranged radially at equal distances. Since the spray guns 4a to 4e are arranged in parallel with shifted positions, as shown by L and υ in FIG.
When the spray guns 4a are arranged in parallel on the same line in the circumferential direction (no front and rear entrances and exits in the axial direction), the spraying surface of the coating agent from each gun stays within range L in the figure. However, in the present invention, the spray gun 4a ~ 4e, there is a dimensional difference of 2 between the gun 4c at the front end and the guns 4a, 4e at the rear end, so when each gun 4a ~ 4e sprays coating at the same time, the spray spread is L + υ. The width in the axial direction is expanded, and at the same time, the injection surfaces of each gun also overlap each other, so that the coating surfaces can be sprayed repeatedly without fear of becoming spiral-shaped as the metal frame 1 rotates and the device 3 advances. This process is carried out without interruption, making it easy to obtain an extremely smooth coating surface with no irregularities, and the enlarged spray surface makes it more efficient and faster than when the coating is lined up in a single horizontal row. The successive progression of the circumferentially and axially extending overlapping spray surfaces allows the coating operation to be completed evenly without precise adaptation control of the spray gun spacing, trough movement speed and frame rotation speed. Smooth coating can be completed efficiently, and at the same time, there is no need for an unnecessarily large number of spray guns, and the piping structure and the entire device can be made compact, and it is also suitable for large metal frames. The coating operation can be carried out quickly, and it is an excellent device for coating the inner surface of various cylindrical metal frames, including metal frames for centrifugal casting.

[Brief explanation of drawings]

FIG. 1 is a front view of an embodiment of the apparatus of the present invention, FIG. 2 is a side view of the same, and FIGS. 3 and 4 are explanatory views of the arrangement of the spray guns on a circular arc. 1...Gold frame, 1a...Inner surface of the metal frame, 3.
...Spray gun device, 4a, 4b, 4c, 4d
, 4e... Spray gun, 5... Coating agent supply pipe, 6... Air supply pipe, 7...
...Slurry copper pipe, 8...Air copper pipe.

Claims (1)

[Claims] 1 A device consisting of a plurality of spray guns for coating the inner surface of a cylindrical metal frame such as a metal frame for centrifugal casting with a paint, etc., in which the plurality of spray guns are arranged in the circumferential direction within the metal frame. However, they are all approximately equidistant from the inner surface of the cylindrical metal frame, and in the axial direction, they are arranged in a positional relationship that starts with the gun at the center and gradually retreats to the guns on both left and right sides in the circumferential direction. A multi-head air spray gun device characterized by: