JPS592598B2 - Welding rod coating coating equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a welding rod coating coating device, and more specifically, a welding rod coating coating device for efficiently performing the coating coating around a core wire, which is one of the steps for manufacturing coated welding rods. This relates to improvements to coating equipment.

When manufacturing coated welding rods, it is best to apply a wet-kneaded coating material (flux) adjusted to the desired composition around the core wire and then send it to a drying process to dry it to obtain a coated welding rod. Are known.

However, in the coating process, it is required that the flux be applied uniformly around the core wire and with sufficient adhesion strength. An example of a conventional coating material coating device will be explained based on the drawings. In Fig. 1, 1 is a wet mixer for selectively mixing fine powders of various metal oxides, silicic acid compounds, carbonates, etc. and kneading them with water glass; 2 is a wet mixer for selectively mixing fine powders of various metal oxides, silicic acid compounds, carbonates, etc.; A flux chute 3 that can be cut out is a flux forming machine connected to the cutting opening of the chute 2, and as shown in the figure, there is a forming cylinder 4 that can receive the flux from the chute 2, and one end inside the forming cylinder 4. It is composed of a piston 5 that is inserted so as to be movable forward and backward, and a hydraulic cylinder 6 that operates the piston 5.

The flux is extruded by the molding machine 3 to the other end of the molding cylinder 4 as a relatively short cylindrical molded product 7. Reference numeral 8 denotes a coating machine for coating the core wire with the flux molding 1 sent from the molding machine 3 via a conveyor, and the coating machine 8 coats a plurality of the flux moldings T in series. A receiving plate 9 to be placed, a flux cylinder 10 installed at one end of the receiving plate 9, a flux pushing piston 11 installed at the other end of the receiving plate 9, and a hydraulic cylinder 12 for moving the piston 11 forward and backward. A die head containing a die is integrally attached to the tip of the flux cylinder 10.

Reference numeral 13 denotes a core wire supply machine that supplies the core wire to the die head in a direction that intersects the line of the coating machine 8;
4 and a supply roller 15.

16 is a cross conveyor for transporting the coated core wire, and 17 is a conveyor for transporting the core wire in a direction perpendicular to the cross conveyor 16, which continues to the next drying step.

When the coating material is actually applied using the conventional coating device, the flux molded article 7 formed by the flux molding machine 3 is used.
A plurality of pieces are placed on the receiving plate 9 of the coating machine 8 at the same time, and this one
The amount of flux is pushed into the flux cylinder 10 by the piston 11 operated by the hydraulic cylinder 12, and simultaneously pushed out from the die of the die head while pressurized.
The core wires are fed one by one from the core wire feeder 13 to the die head, and extruded from the die head with the core wires coated with a constant thickness of flux.

The supply of the core wire is carried out sequentially and continuously until the pressure extrusion of 10 pieces of flux is completed, but when the extrusion limit is reached, the pressurizing operation and the core wire supply operation are stopped, and the piston 11 returns to the starting position. The flux of the next rod waiting on the side of the receiving plate 9 is received on the receiving plate 9, and the above-mentioned pressure extrusion operation is repeated again.

The core wire supply operation is temporarily interrupted after the extrusion of 10 lots of flux is completed until the extrusion of the next lot of flux is started, but the shorter the interruption time, the higher the equipment operation rate and the higher the productivity. Become.

However, in conventional paint sprayers, in order to restart a new coating operation, the next 20 pieces of flux waiting on the side of the tray are placed on the tray, and then the piston is operated to transfer the flux into the cylinder. Since the paint is pressed and pressurized and supplied into the die head for painting, the interruption time before painting starts is not necessarily short (the idle time in conventional American painting machines was approximately 45 seconds). Furthermore, when manufacturing coated welding rods, the core wire size and/or flux composition may be changed frequently to manufacture a wide variety of welding rods of various brands. In particular, in the case of flux switching, a considerable amount of the previous flux remains in the die head, so unless this is quickly removed, the switching time will inevitably become longer. In conventional equipment, the die head is attached to the flux cylinder, so the flux inside the die head cannot be cleaned quickly, and it takes a long time to restart painting, which also hinders productivity improvement. Ta. The present invention solves the problems seen in the conventional painting equipment described above, and can shorten the temporary interruption time during painting work as much as possible. It is an object of the present invention to provide a highly productive welding rod coating coating device that can shorten changeover time. The details of the present invention will be explained below based on embodiments shown in the drawings.

Fig. 2 shows the entire coating device according to the present invention, and Fig. 3 shows a plan cross-section, and the wet mixer and coating conveyor are omitted, but they may be the same as or different from those shown in Fig. 1. Those with a known structure are installed in series.

As shown in the figure, 21 is a flux chute that supplies and stores the flux sent from the wet mixer so that it can be cut out in predetermined amounts by an extrusion cylinder 22, and 23 is connected to the cutout position of the chute 21. 24 is a base on which the forming/coating machine 23 is installed, 25 is a core wire feeder, and 26 is a cross conveyor. As shown in the figure, the flux forming machine and coating machine 23 has a rotating shaft 2 supported on a base 24 by a rotating support 27.
8 is provided with two rotating disks 29, 30 whose centers are fixed, and a pair of flux cylinders 31, 3 are arranged symmetrically across the rotating shaft 28 by the rotating disks 29, 30.
2 and the flux cylinder 31
, 32 (on the opposite side of the die head), a painting pressurizing cylinder 33} and a molding pressurizing cylinder 34 are fixedly fixed to the base 24 with a space between them. On the other end side of the pair of flux cylinders 31 and 32, the cylinder 3
A molding presser cylinder 35 and a die head 36 are installed which fit the respective cylinders when the cylinders 1 and 32 are stopped. Further, the coating cylinder 33 is provided at a position that coincides with the axis of one of the flux cylinders 31 or 32 when the pair of flux cylinders 31, 32 is stopped at a predetermined position, and the forming cylinder 34 is also provided with a flux cylinder 34. It is provided at a position that coincides with the axis of the cylinder 31 or 32. Further, a flux receiving tube 37 is disposed between the forming cylinder 34 and the flux cylinder 31 or 32 and is integrated with the cutting opening of the flux chute 21. With such flux forming and the arrangement of the coating machine 23, the piston 3 of the coating cylinder 33
8 is inserted into the flux cylinder 31 or 32 to supply flux under pressure to the die head 36,
The piston 39 of the other molding cylinder 34 passes through the flux receiver 37 and is inserted into the flux cylinder 131 or 32, where it is combined with the piston of the molding presser cylinder 35 to perform the molding operation of the flux molded product. Become.

Moreover, by rotating the rotary disks 29 and 30 by 1800 degrees, the pair of flux cylinders 31 and 32, which are arranged symmetrically across the center line of rotation, can be moved to the flux receiver 37 and the forming presser cylinder 35. The flux forming position is rotated alternately between a position corresponding to the die head 36 (flux forming position) and a position corresponding to the die head 36 (flux coating position). Hydraulic cylinders may be used for the painting cylinder 33} and the forming cylinder 34, but since the painting cylinder 33 requires higher pressure, hydraulic cylinders with optimal capacities may be set for each.

Further, although the rotational drive unit of the discs 29 and 30 that allows the pair of flux cylinders 31 and 32 to operate interchangeably is not shown, for example, the rotating shaft 28 is connected to the output shaft of a motor or the like via a speed reducer or the like. Alternatively, a method may be used in which a gear is carved on the outer periphery of a rotating disk and the gear is directly rotated by a drive gear. Although the disk may be rotated in either forward or reverse direction or in one direction, it is preferable to provide a mechanism that allows the flux cylinder to accurately stop at a predetermined position.
Further, the core wire feeder 25 is the same as the conventional one, and consists of a core wire storage box 40 and a feed roller 41, and supplies the core wire to the die of the die head 36 at a desired speed via a core wire guide. .

In the illustrated example of the present invention, two core wire feeders 25 are arranged side by side, and when the core wire supply is finished or the core wire size is changed,
The core wire supply machine that was on standby is immediately shifted to a predetermined line to restart the self-gland supply. Nah},
In the case of the present invention, the direction in which the core wire is supplied and the direction in which the flux is supplied from the forming/coating machine 23 are arranged to be almost directly opposite to each other. The illustrated example described above is merely an example of the present invention, and it is of course possible to make appropriate changes within the scope of the technical idea of the present invention. For example, the rotating disk that rotatably holds the cylinder portion is not limited to a circular shape, but may be formed into a rectangular or other angular rotating body, and the receiving tube 37 that receives the flux may be integrated with the chute 21. A cylindrical body is formed with a loading port that can communicate with the cutting opening of the chute 21, without having to be configured as a cylindrical body.
It can also be installed integrally with the two cylinders and hydraulic cylinders 33 and 34. Furthermore, in addition to arranging two core wire feeders 25 in parallel as described above, it is also possible to arrange two mixers (including a flux shoot) (not shown) in parallel to replace the flux. Conceivable. Further, as the molding die and the pressure cylinder for painting according to the present invention, it is possible to adopt an appropriate one such as an air cylinder other than a hydraulic cylinder. In the present invention, the pair of flux cylinders are configured to be interchangeable by rotating the flux cylinders to their respective positions. When supplying the flux under pressure to the die head, the connection structure between the flux cylinder and the die head is important.

That is, it is necessary to have a structure that allows a good connection state to be obtained when supplying flux under pressure, allows smooth air removal from the molded product, and does not impede the rotational movement of the flux cylinder when disconnected. FIG. 4 shows an example of a die head and cylinder Q connection structure. The flux cylinder 31 is held slidably in the axial direction on a frame 42 (in the above example, this part corresponds to the rotating disk or is fixed to the disk), and has a gap adjustment ring at its tip. 43 are screwed together.

A groove 44 that guides the flux in a perpendicular direction is formed in one die head 36, and a die 45 is mounted on the outlet side of the groove 44, and a core guide 46 is built-in so as to face the die 47. There is. The connecting surface of the die head 36 with the cylinder 31 consists of a smooth surface 47 facing the tip surface of the adjustment ring 43 and a grooved surface 49 facing the tip surface 48 of the flux cylinder 131. The tip end surface 50 of the flux cylinder 31 is also formed into a grooved surface.
Therefore, if the piston 38 inside the cylinder is moved to the right with a gap between the tip of the cylinder 31 and the die head 36, the cylinder 31 will be pushed to the right due to the friction between the inner surface of the cylinder and the piston seal. The tip thereof is brought into close contact with the die head 36. When the pressure extrusion of the flux is finished and the piston 38 is retreated, the cylinder 31 moves to the left and stops at a position where the rear surface of the ring 13 touches the frame 42. At this position, the die head 36 and the cylinder 31 are connected. A sufficient gap is formed in the cylinder 31.
There is no branch in the rotational movement of. Air from the flux is vented through the grooved surfaces 49 and 48 of the die head 36 and cylinder 31.
This is done through the grooves of the Furthermore, by rotating the ring 43 and moving its position, the gap between the cylinder 31 and the die head 36 can be adjusted as appropriate. Of course, the coating apparatus of the present invention is not limited to the connection structure shown in FIG. 4, and any other arbitrary structure can be adopted. Next, a case will be described in which a coating agent is applied using the apparatus of the present invention.

Referring to FIG. 2 and FIG. 3, the operation from the stage when the first flux cylinder 31 is filled with a predetermined amount of flux will be explained. First, the painting cylinder 33 is operated and the piston 38 is advanced to advance the first flux cylinder 31. When the flux is inserted into the flux cylinder 31, the flux is immediately pressurized and passes through the die head 36 while removing air and is ejected from the tip die.

In this case, the core wire is continuously fed into the die head 36 from the core wire feeder 25 at a predetermined speed, and the flux is uniformly coated around the core wire, and the flux is then passed from the die. It is discharged to the cross conveyor 26, transferred to the coating conveyor, and headed for the next process. In parallel with this coating process, a flux forming process for the next rod is performed using the other second flux cylinder 32} and forming cylinder 34. That is, as shown in Figure 3 and Figure 5,
After the piston 35a of the forming presser cylinder 35 is stopped at the first forming position in the second flux cylinder 32, a predetermined amount (for one flux molded product) of flux is introduced into the receiving tube 37 from the flux shoot 21. When the flux is pressed into the second flux cylinder 32 by operating the cutting and forming pressurizing cylinder 34 to advance its piston 39, the piston 35a and the piston 39
50A of flux moldings are molded (Fig. 5A)
. Next, the piston 35a is moved back to the next molding position, the piston 39 is returned, and after cutting out the next flux from the chute 21, the piston 39 is moved forward again.
A second 7-lux molding 50B is successively molded in the flux cylinder 32 (FIG. 5Q). In this way, as shown in Figure 5C, the third flux molded product 50C is
By molding and repeating the same operation, a predetermined number of flux molded products will be molded and filled into the cylinder 32. By the time the flux in the first flux cylinder 131 is extruded and ten flux coating processes are completed, the flux forming process in the second flux cylinder 1 is completed.

When the flux coating process inside the first flux cylinder 131 is completed, the piston 38 is returned to its original position, and then the rotating disks 29 and 30 are rotated 1800 times by the drive unit, and the first flux cylinder 131 is finished. 31 to the flux forming position (the position of the second flux cylinder 32) and the second flux cylinder 32 to the flux painting position (the position of the first flux cylinder 31),
The flux coating step for the next rod and the next new flux forming step may be performed using the operations described above. In order to restart the flux coating process for the next rod, it is only necessary to rotate the disk and move the piston 39 forward, so it can be restarted in an extremely short time. For example, when changing the flux using the above-mentioned coating equipment, the rotating disks 29 and 30 should be
The flux cylinders 31 and 32 are stopped at an intermediate position where they do not match with the die head 36 and the molding presser cylinder 35, and the flux inside the flux cylinders 31 and 32 is cleaned (for example, by cleaning with a brush). After replacing the die in the die head 36, the remaining flux in the die head 36 is paid out (for example, using a dedicated payout cylinder), and each cylinder is returned to its designated coating and molding position, and the flux is removed from the die head 36. The new component flux can be supplied from Ute 21.

The subsequent operations are flux forming, rotation of the cylinder, flag 7 painting}, and the start of flux forming. When replacing the flux, the die head 36 and molding presser cylinder 35 can be easily separated from the flux cylinders 31 and 32, making it easy to clean the flux inside the cylinders and immediately return the work to the painting and molding position. This means that the switching time can be significantly shortened. As explained above, according to the coating apparatus of the present invention, the pair of flux cylinders having the same structure are made interchangeable between the coating position and the forming position, thereby reducing the idle time between each flux rod. The coating work can be shortened, efficient, and have a high equipment operating rate.

What's more, we can significantly shorten the changeover time for tasks that conventionally require a large amount of changeover time, such as flux change, and provide coating equipment that is suitable for producing many types and brands of coated welding rods. obtain. EXAMPLE The following are the performance comparison test results when the coating material was applied using the coating apparatus of the present invention (structure shown in Fig. 2 and Fig. 3) and the conventional coating apparatus shown in Fig. 1. It is shown in Table 1 below.

As is clear from the table below, using the coating equipment of the present invention can significantly shorten switching time and idle time compared to conventional equipment, and improve operating efficiency, number of coats coated, and production capacity. It can be seen that there has been a significant improvement.

[Brief explanation of drawings]

FIG. 1 is an overall perspective view showing a conventional coating device, FIG. 2 is an overall perspective view showing an embodiment of the coating device according to the present invention, and FIG.
The figure is a partial sectional plan view of FIG. 2, FIG. 4 is a sectional view showing an example of the connection structure between the flux cylinder 1 and the die head, and FIG.
Figures A, 8 and 8 are work process diagrams for explaining the flux forming process. 21... Flux Shu Ichige, 23...
・Flux forming/painting machine, 25... Core wire feeding machine, 26... Cross conveyor, 29, 30...
... Rotating disk, 31, 32 ... Flux cylinder 1, 33 ... Pressure cylinder for painting,
34... Pressure cylinder for molding, 35...
...Forming presser cylinder, 36... Die head, 37... Flux receiver, 38, 39...
... Piston, 40 ... Core wire feeder, 41.
... Core wire feed roller.

Claims (1)

[Scope of Claims] 1. A method of supplying a core wire from one direction of a core coating die head and simultaneously supplying a coating agent under pressure into the die head from a direction intersecting the core wire supply direction to remove the coating agent from the die head. In a coating device for discharging a coating material around a core wire, a pair of flux cylinders is held interchangeably between two positions, a flux forming position and a flux coating position, and one axial end side of the flux cylinder is A coating device for a welding rod coating agent, characterized in that a pressurizing cylinder for forming and a pressurizing cylinder for coating are respectively fixedly installed at positions corresponding to the two positions mentioned above via a flux receiving part. 2. The coating apparatus according to claim 1, wherein the pair of parallel flux cylinders are held symmetrically with respect to the center of rotation of the rotating body.