JPS592597B2 - 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.

It is well known that when manufacturing coated welding rods, a coated welding rod is obtained by applying a wet-kneaded coating material (Franks) adjusted to the desired composition around the core wire and then sending it to a drying process to dry it. It is being

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 receives the flux from the chute 2, and a flux forming machine that moves forward and backward from one end into the forming cylinder 4. It is composed of a piston 5 that can be inserted freely, 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 □. Reference numeral 8 denotes a coating machine for coating the core wire with the flux molding T sent from the molding machine 3 via the conveyor, and the coating machine 8 loads a plurality of the flux moldings 7 in series. a flux cylinder 10 installed on one end of the receiving plate 9, a flux-pushing piston 11 installed on the other end of the receiving plate 9, and a hydraulic cylinder 12 for advancing and retracting the piston 11. 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 crossing the line of the coating machine 8, and a core wire storage box 1.
4 and a supply roller 15.

16 is a cross conveyor for transporting the coated core wire, and IT 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 1 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
The rod portion 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 tie head, and extruded from the die head with a constant thickness of flux coated around the core wires.

The supply of core wires is carried out sequentially and continuously until the pressure extrusion of 1 rod worth 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 by 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 rods of flux is completed until the start of extrusion of the next rod of flux, but the shorter the interruption time, the higher the equipment operating rate and the higher the productivity. Become.

However, in conventional paint sprayers, in order to restart a new painting operation, the flux for the next rod waiting on the side of the tray is placed on the tray, and then the piston is operated to push the flux into the cylinder. Since coating is performed by pressurizing the paint and supplying it into the die head, the interruption time until the start of painting cannot necessarily be said to be short (the idle time in conventional paint machines was approximately 45 seconds). Further, when manufacturing coated welding rods, the size of the core wire and/or the flux composition may be frequently changed 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. . The present invention solves the above-mentioned problems found in the conventional painting equipment, makes it possible to shorten the interruption time during painting work as much as possible, and also makes it possible to switch over when switching to other types or brands. It is an object of the present invention to provide a highly productive welding rod coating coating device that can shorten time. The details of the present invention will be explained below based on embodiments shown in the drawings.

Fig. 2 shows the entire coating apparatus according to the present invention, and the wet mixer and coating conveyor are omitted, but those of the same or other known structure as shown in Fig. 1 are installed in series. has been done.

In the figure, 21 is a flux chute that supplies and stores the flux sent from the wet mixer and can be cut out in predetermined amounts by an extrusion cylinder 22, and 23 is a flux chute connected to the cutting port position of the chute 21. A molding and coating machine, 24 is a base on which the molding and coating machine 23 is installed, 25 is a core feeder, and 26 is a cross conveyor. The flux forming and coating machine 23 is as shown in the figure.
A pair of flux cylinders (referred to as a first flux cylinder 27 and a second flux cylinder 28 for convenience), a pair of hydraulic cylinders (first hydraulic cylinder 29)
and a second hydraulic cylinder 30), a forming presser cylinder 31, and a die head 32.

The mutual positional relationship of these flux cylinders 27, 28 and hydraulic cylinders 29, 30 is such that the axes of the first flux cylinder 27 and the first hydraulic cylinder 29 are aligned, and the axes of the second flux cylinder 28 and 28 are aligned with each other. and the second hydraulic cylinder 30 are also arranged so that their axes coincide and at the same time, these two axes are parallel. Specifically, the first and second flux cylinders 27, 28
are held in symmetrical positions across the center of rotation by two rotating discs 33, 34 at their front and rear ends, and the other first and second hydraulic cylinders 29, 30 are also held by two rotating discs 33, 34. The disks 33, 34, 35, and 36 are held symmetrically across the center by rotating disks 35 and 36, and the disks 33 and 3 on both sides are held so that their centers are aligned in a straight line.
6 is pivotally supported by a rotation support part 37 provided on the base 24. However, as shown in FIG. 3, the flux cylinders 27, 28 and the hydraulic cylinders 29, 30 are not directly connected, but a certain distance is provided between them and the inner discs 34, 35, and this is connected to the flux chute 21. It is used as a receiving part for flux cut out from.

That is, the cylindrical flux receiving plate 38 formed integrally with the cutting opening of the chute 21 is connected to one flux cylinder 2.
7 or 28 and the hydraulic cylinder 29 or 30 so as to coincide with their axes. In addition, this flux receiving plate 3
On the other end side of the flux cylinder 28, which coincides with the cylinder 8, there is a forming presser cylinder 3 whose axis line coincides with that of the cylinder 28.
1 is placed. One flux cylinder 28
When the hydraulic cylinder 30 is in a position that matches the receiving plate 38 and the presser cylinder 31, the die head 32 is fixed in a position that matches one end of the other flux cylinder 27 in the flux extrusion direction. In addition, 39 is a shaft connecting the centers of the disks 34 and 35, 40 and 41 are respective pistons of the first and second hydraulic cylinders 29, 30, and these are the first and second flux cylinders 27, It reciprocates within 28. Therefore, if the rotating disks 33 and 36 are rotated by 180 da,
A pair of first flux cylinder 27 and first hydraulic cylinder 29 and a pair of second flux cylinder 28 and second hydraulic cylinder 30, which are arranged symmetrically across a line, are connected to a flux receiving plate 38 and a presser foot. The position corresponding to the cylinder 31 (flux forming position) and the die head 32
(flux coating position).

The rotation of the disk is achieved by cutting a gear on the outer periphery of at least one arbitrary disk and meshing the gear with a gear rotated by an electric motor, or by directly rotating a rotating shaft, or by other suitable methods. However, it is necessary to select a method that allows the disc to accurately stop at a predetermined position. In addition, the core wire feeder 25
is the same as the conventional one, and consists of a core wire storage box 42 and a feed roller 43, and supplies the b-wire to the die of the die head 32 at a desired speed. 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 coating machine 23 are arranged to be substantially perpendicular 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 disk, and the receiving plate 38 that receives the flux may be integrated with the chute 21. Shoot 21 without configuring
a housing formed with a charging port that can communicate with the cutting port of the
It can also be mounted integrally with the flux cylinders 27, 28 and/or the hydraulic cylinders 29, 30. Furthermore, in order to speedily perform the work when changing the size of the core wire, it is convenient to prepare two core wire feeders so that they can be shifted to predetermined positions with respect to each other. Further, in the present invention, the hydraulic cylinder used for forming and painting the flux may be replaced with another pressurizing device such as an air cylinder. In the present invention, a flux forming/painting machine consisting of a pair of flux cylinders and a hydraulic cylinder having the same structure is prepared in this way, and the machines are configured to be interchangeable by rotating the respective positions. When a flux molded product in a flux cylinder connected to the die head 32 is supplied under pressure to the die head 32 side, the connection structure between the flux cylinder and the die head is important.

That is, it is necessary to have a structure that provides a good connection state when supplying flux under pressure and allows smooth air removal, and that does not impede the rotational movement of the flux cylinder when disconnected. FIG. 4 shows an example of a connection structure between a die head and a flux cylinder. The flux cylinder 27 is held slidably in the axial direction on a frame 44 (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. 4
5 are screwed together.

A groove 46 that guides the flux in a right angle direction is formed in one of the die heads 3 and 2, and a die 47 is formed on the exit side of the groove 46.
is attached, and the core wire guide 48 is attached to the die 47.
Built-in oriented. The connecting surface of the die head 32 with the cylinder 27 consists of a smooth surface 49 facing the tip surface of the adjustment ring 45 and a grooved surface 51 facing the tip surface 50 of the flux cylinder 27. The tip end surface 50 of the flux cylinder 27 is also formed into a grooved surface. Therefore, the tip of the cylinder 27 and the die head 32
The piston 40 in the cylinder with a gap between
When the cylinder 27 is moved to the right, the cylinder 27 is pushed to the right due to the friction between the inner surface of the cylinder and the piston packing, and the tip of the cylinder 27 is brought into close contact with the die head 32. When the pressure extrusion of the flux is completed and the piston 40 is retreated, the cylinder 27 moves to the left and stops at a position where the rear surface of the ring 45 touches the pedestal 44, but at this position the die head 32 and the cylinder 27 are fully connected. A gap is formed, and cylinder 2
There is no problem with the rotational movement of 7. Air from the flux is vented through the die head 32 and the grooved surfaces 51, 5 of the cylinder 27.
This is done by a groove of 0. Furthermore, by rotating the ring 45 and moving its position, the cylinder 27
The gap between the die head 32 and the die head 32 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.

To explain the operation from the stage where the first flux cylinder 27 is filled with a predetermined amount of flux in FIGS. 2 and 3, first, the first hydraulic cylinder 29 is operated to move the piston 40 forward. When inserted into the first flux cylinder 27, the flux is immediately pressurized, air is removed, passes through the die head 32, and is ejected from the tip die.

In this case, the core wire is continuously fed into the die head 32 from the core wire feeder 25 at a predetermined speed, and the flux is uniformly coated around the core wire before passing from the die to the next core wire. 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 28 and second hydraulic cylinder 30. That is, as shown in FIGS. 3 and 5, the piston 31a of the forming presser cylinder 31 is
After stopping the flux cylinder 28 at the first forming position, cut out a predetermined amount (for one flux molded product) of flux from the flux shoot 21 into the receiving plate 38.
The second hydraulic cylinder 30 is operated and its piston 41 is
When the flux is pushed forward into the second flux cylinder 28, one flux molded product 52A is formed by the piston 31a and the piston 41 (the fifth
Figure A). Next, the piston 31a is moved back to the next molding position, the piston 41 is returned, and after cutting out the next flux from the chute 21, the piston 41 is moved forward again. Flux molded products 52B are continuously molded (Figure 5, opening). In this way, a third flux molded product 52C is molded as shown in FIG. By the time the flux in the first flux cylinder 27 is extruded and the flux coating process for 10 coats is completed, the flux in the second flux cylinder 28 is
The flux forming process inside has been completed. When the flux coating process in the first flux cylinder 27 is completed, the piston 40 is returned to its original position, and the rotating disks 33 to 36 are rotated 1800 times by the drive unit to complete the first flux coating process.
Flux cylinder 27 and first hydraulic cylinder 2
9 to the flux forming position (second cylinder 28 and 3
0 position), and the second flux cylinder 28 and second hydraulic cylinder 30 to the flux coating position (first
The positions of the cylinders 27 and 29) may be interchanged, and the flux coating process and the subsequent flux forming process for the next rod may be performed in the same manner as 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 41 forward, so that the process can be restarted in an extremely short time. For example, when changing the flux in the above coating apparatus, the rotating disks 33 to 36 are rotated by about 90 degrees, and the flux cylinders 27 and 28 are stopped at an intermediate position that does not match with the die head 32 and the forming presser cylinder 31. and flux cylinder 1 27, 2
After cleaning the flux in the die head 32 (for example, using a cleaning cylinder with a brush) and discharging the residual flux in the die head 32 (for example, using a dedicated dispensing cylinder), and replacing the die in the die head 32,
Each cylinder is returned to its predetermined coating and molding position, and the flux of the new component is supplied from the flux shoot 21.

The subsequent operations include flux forming, rotation of the cylinder, flux painting, and the start of flux forming. When changing the flux, the die head 32 and molding presser cylinder 31 can be easily separated from the flux cylinders 27, 28, making it easy to clean the flux in the cylinder and remove residual flux in the die head, and to immediately start painting and molding. This means that the work can be resumed after returning to its original position, significantly reducing changeover time. As explained above, according to the coating apparatus of the present invention, the pair of flux cylinders and pressurizing cylinders having the same structure are made interchangeable between the coating position and the molding position.
The idle time between each rod of flux can be shortened, and painting work can be performed efficiently and with 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 results of various performance comparison experiments when coating materials were applied using the coating device of the present invention (structure shown in FIGS. 2 and 3) and the conventional coating device shown in FIG. 1 are shown below. It is shown in Table 1.

Test conditions As is clear from the above table, the switching time and idle time can be significantly shortened by using the coating equipment of the present invention compared to the conventional equipment, and the operating rate, number of coats coated, and production capacity are improved. 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.
Fig. 1 is a work process diagram for explaining the Hapa flux forming process. 21...Flux shoot, 23...
・Flux forming/painting machine, 25... Core wire feeding machine, 26... Cross conveyor, 27, 28...
...Flux cylinder 1, 29, 30...
Hydraulic cylinder, 31... Forming presser cylinder, 32... Die head, 33-36...
・Rotating disk, 37...Rotating support part, 38...
... Flux receiving plate, 40, 41... Viston, 42... Core wire storage box, 43... 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 the core wire, a pair of flux cylinders and a pair of molding and coating machines are provided such that their axes coincide with each other with a necessary spacing between the flux cylinders and the flux receiver. A pressurizing cylinder for welding rods is held interchangeably between two positions: a flux forming position and a flux coating position. 2. The coating apparatus according to claim 1, wherein the pair of flux cylinders and pressure cylinders are held symmetrically with respect to the center of rotation by a plurality of rotating bodies that rotate simultaneously.