JPS61154796A - Coating material coating device for coated electrode - Google Patents

Abstract

PURPOSE:To coat a coating material onto a welding rod without the fluctuation in the outside diameter, eccentricity, coating crack, etc. by providing means for feeding a preformed flux to a cylinder having an air vent to mold the flux and coating the molded flux contg. no air to a core wire. CONSTITUTION:The flux charged to a preforming cylinder 36-1 is pressed and preformed by a pushing plate 13. A pressurizing piston 5 is advanced to charge the flux into a molding cylinder 36 and is compressed to release the air in the flux from the air vent hole 17..A partition plate 18 is risen and the piston 5 is advanced to transfer the molded flux into a cylinder 1. The cylinder 1 is turned 180 deg. to be alternated with a flux cylinder 1-2 and is stopped in the flux coating position. A pressurizing piston 7 for coating is advanced to pressurize and extrude the flux 44 and to coat the same to the core wire supplied to a die head 24. The coated electrode is thus obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an improvement of an apparatus for coating a core wire with a coating material of a coated arc welding rod.

(Prior Art) When manufacturing a coated arc welding rod (hereinafter referred to as a welding rod), desired components are mixed around the core wire.

It is well known that after coating a wet kneaded coating material (hereinafter referred to as flux), it is sent to a drying process and dried to obtain a welding rod. However, it is required that the steps from the wet cross-crossing step to painting be performed efficiently, and that the flux be coated uniformly around the core wire with sufficient adhesion strength. First, an example of a conventional Fusix coating device will be explained based on the drawings.

Figure 4 shows the entire conventional coating equipment, and Figure 5 shows a plan cross section, omitting the wet mixer. 25.2: a flux chute that can be cut out in predetermined amounts by an extrusion cylinder IO; 3 is a flux receiver connected to the cutting opening position of the chute 9; 8 is a base; 25.2
8 is a core feeder, 28 is a cross conveyor, and 32 is a conveyor 4. ' The above flux forming cylinder 1 and painting cylinder 1
-2 is provided with two rotating disks 22 whose centers are fixed to a rotating shaft 21 supported by a rotating support part 31 on a base 8, and rotated by the rotating disks 22, as shown in the figure. Axis 21
A pair of flux cylinders are placed symmetrically across the
, 12, and a coating pressure cylinder 6 and a molding pressure cylinder 4 are fixedly fixed to the base 8 at intervals on one end side of the flux cylinders 1 and 1-2 (on the opposite side of the die head). It consists of At the other end of the pair of black stripe cylinders 1.1-2, there are installed a two-form presser piston 28 and a die head 24, which fit into the respective cylinders when the flux cylinders 1.1-2 are stopped. Further, when the pair of flux cylinders l and 12 are stopped at a predetermined position, the painting pressurizing cylinder 6
It is provided at a position that coincides with the axis of one of the flux cylinders 1 or 1-2, and the molding pressure cylinder 4 is also provided at a position that coincides with the axis of the flux cylinders 1 and 1-2. Furthermore, a flux receiver 3 integrated with the cutout of the flux chute 9 is disposed between the molding pressure cylinder 4 and the flux cylinder 1 or 1-2.

With this arrangement of the flux molding and coating machine, the piston 7 of the coating cylinder 1-2 is inserted into the flux cylinder 1-2 and supplies flux under pressure to the die head 24, while the piston 5 of the other molding cylinder l is inserted into the flux cylinder l through the flux receiver 3, and there, in combination with the forming presser piston 28, the flux is formed.Moreover, by rotating the rotary disk 22 by 180 degrees, the central axis 21 is rotated once. A pair of flux cylinders 1 and 1-2 arranged symmetrically with each other in between are located at positions corresponding to the flux receiver 3 and the forming presser piston 28 (flux forming position).
and a position corresponding to the die head 24 (flux coating position). Note that hydraulic cylinders are generally used for the cylinder 6 in the painting position and the cylinder 4 in the molding position. Also, the interchangeable operation of the pair of flux cylinders 1 and 1-2 has a structure that allows the flux cylinders to accurately stop at a predetermined position. It has become. The core wire feeder consists of a core wire storage box 25 and a feed roller 2B, and the die head 24
The core wire is fed to the die through the core wire guide at a desired speed. This core wire supply direction and the painting position cylinder! The direction of flux supply from the molding/painting machine 3 of -2 is arranged to be almost perpendicular to each other.

In this way, the two pairs of flux cylinders 1 and 1-2 are configured to be interchangeable by rotating the respective positions, but the tip surfaces of the flux cylinders 1 and 1-2 that come into contact with the die head 24 are Air vent grooves are provided along with opposing die head surfaces.

(Problem to be Solved by the Invention) When applying flux using the above-mentioned conventional coating equipment, the time required from the completion of 10 feet of flux extrusion to the start of flux extrusion of the next loft is reduced by using a pair of flux cylinders. The time has been shortened, the operation rate of coating equipment has improved, and productivity has increased. However, since the molding flux was directly pressure molded in the black strip cylinder and lengthened by joining short cylinders,
It is pressurized and loaded with air mixed in due to gaps, molding flux dripping, etc. Therefore, when the amount of flux supplied is small, the forming flux on the cylinder is short in proportion to the stroke of the cylinder l, and even if it enters the forming process, it is compressed with many cavities. On the other hand, avoid air intrusion.

When increasing the supply amount for efficient molding, the mixed flux is always filled up to the top of the flux supply section 9, and when the piston 5 during molding returns to its original position after compression, the kneaded flux at the top is transferred to the molding piston 5. It falls into the piston rod L and gets caught inside the molded cylinder to return to the bottom.
The seals and piston rods wear out quickly, causing oil leaks and other malfunctions. When the flux cylinder loaded with flux is rotated 1800 times for painting, the air contained in the molding flux is vented in the gap between the grooved surfaces of the flux cylinder and the die head, but the air is removed sufficiently. If this is not done, the following problems may occur during the painting process or the welding rod.

1. The coating becomes eccentric due to the uneven distribution of the amount of air mixed in the flux.

2. The surface of the welding rod partially expands, making that part soft and prone to surface flaws.

3. The degree to which the flux adheres to the core wire, the so-called degree of adhesion, is poor, causing the coating to fall off.

If air remains in the forming flux as described above, it will have an adverse effect on the painting work and the welding rod, so a cylindrical forming flux that does not contain any air and has a high density is required.

In addition, there is a technology to continuously form and paint flux using a screw under vacuum, but it is difficult to supply a fixed amount of flux to the die head and at a constant pressure, making it difficult to efficiently produce uniform, high-quality welding rods. There is a problem.

(Means for Solving the Problems) The present invention has been developed to solve the above-mentioned problems, and the gist thereof is a pre-forming method in which a pre-formed coating material is retained in a predetermined amount at a time. A cylinder is provided, a pushing plate that is moved up and down by a drive device is placed on top of the preformed cylinder, and a forming cylinder with the same diameter as the flux cylinder and provided with a plurality of air vent holes is installed at the flux forming position to contain air. This equipment makes a molding flux that is not coated and uses it to coat the core wire with flux. Specifically, it has a pair of coating cylinders at the coating forming position and a coating die head at the front that releases the coated welding rod. In a coating agent coating device that maintains two coating agent application positions interchangeably, a preforming cylinder is provided at the coating agent forming position to retain and preform a predetermined amount of the coating agent, and the preforming A pushing plate that is moved up and down by a drive device is disposed at the top of the cylinder, a forming cylinder is provided coaxially with the preforming cylinder at a position midway between the preforming cylinder and the coating cylinder, and multiple sides are arranged along the axial direction of the forming cylinder. A covering arc welding method is characterized in that an air vent hole that can be opened and closed is formed, and a forming pressurizing cylinder is provided at the rear position, and a pressurizing cylinder for painting is provided at a position after the coating cylinder of the coating coating device. There is a device for applying coating agent on rods.

(Example) Next, the structure of the coating agent coating apparatus of the present invention will be explained using FIGS. 1 to 3.

FIG. 1 is an overall plan view including a partial cross section of the coating coating apparatus of the present invention, FIGS. 2(a), (b), and (c) are sectional views showing the process of flux forming, and FIG. 0 is a cross-sectional view of an example of an apparatus having a conical constriction part. In FIG. The preforming cylinder 3 is provided perpendicularly to the
B-1 is provided coaxially with the flux forming piston 5 and the flux forming cylinder 36. A pushing cylinder 12 having a flux pushing plate 13 at the tip of the rod is attached to the upper part of the preformed cylinder 36-1. With the pushing plate 13 stretched by the pushing cylinder 12, the pushing plate is pushed in as shown by the broken line, and this is repeated to cover the top surface of the preformed cylinder. At this time, the preformed flux is equal to the inner diameter of the flux forming cylinder 38. It will be the same. A partition plate 18 is attached to the flux forming cylinder 3B so that nine cylindrical shaped fluxes 43 are formed. In addition, 1-2 is the flux cylinder l and the rotating shaft 2.
A flux cylinder in the flux coating position rotates around the cylinder 1-2 via a connecting rod 22, and a die head 24 is coaxially disposed in front and rear of the cylinder 1-2 in the fluff coating position.
and a coating pressure cylinder 6, 25.28 is a core wire feeder, and 28 is a cross conveyor.

Further, the flux cylinders 1 and 1-2 are held by cylinder holders 20 and 20-2, and the flux cylinders 1 and 1-2 are held in the cylinder holders 20 and 20-2.
.

Air cylinder 23゜2 which is a driving device for sliding 1-2
3-2 is attached, and the rotating part 22 is rotated 180 degrees by a drive device (not shown) about the rotating shaft 21, and is accurately stopped alternately at the flux forming position and the flux painting position. The flux cylinder 1 at the flux forming position is moved to the rear position (rightward in the drawing) by the air cylinder 23 and joined to the tip 19 of the flux forming cylinder 3B.

A plurality of (five in the figure) air vent holes 17 are bored in the upper part of the molding cylinder 3B along its axial direction, and each of these air vent holes 17 is connected to a corresponding number of cylinders 15 installed above. It can be opened and closed by a stopper 1B that moves up and down. At the rear position of the forming cylinder 38, a preforming cylinder 3-1 is coaxially provided with a pushing cylinder 12 having a flux pushing plate 13 at the tip of the rod at the upper part, and a forming pressurizing piston 5 and a forming pressurizing piston 5 are further disposed behind the forming cylinder 38. A pressure cylinder 4 (hydraulic type) is provided. Furthermore, a coaxial flux-forming presser piston 29 is provided in the front position of the flux cylinder I.

Next, the flux cylinder 12 in the flux coating position
is held by the cylinder holder 20-2 and joined to the die head 24 by the flux cylinder 1-2 and the sliding air cylinder 23-2. A painting pressure piston 7 and a painting pressure cylinder (
Hydraulic pressure) 6 is provided.

Core wire feeder feed roller 26. Guide pipe 27, die head 24. The upper surface of the cross conveyor 28 is installed coaxially and horizontally, and the flux forming position is the guide pipe 2.
This is a structure that is subordinate to 7.

A flux cylinder 1, a forming cylinder 3B, and a forming pressure piston 5 are provided coaxially at the above-mentioned flux forming position. FIGS. 2(a) and 2(b) show how flux is formed using the partition plate 18.

This will be explained in detail using (C).

Flux salt 0 is supplied from the flux tank 35 to the preforming cylinder 38-1 through the preforming chute 37 by the flux cutting plate 11 which is reciprocated by the flux cutting plate movement cylinder 10. Figure 2 (
As shown in a), a forming pressurizing piston 5 is waiting at a rear position of the preforming cylinder 3B-1 to prevent leakage of the flux 41. The supplied flux 41 is pressed by the pusher plate 13 as the pusher cylinder 12 descends, and the air is discharged to preliminarily increase the density. By repeating this operation, when the flux 41 has the same dimensions as the cross section of the 7-lux forming cylinder 36, the preforming is completed.

Next, the partition plate 1B is advanced by the partition plate cylinder 14 to close the front surface of the flux forming cylinder 3B,
When the molding pressure piston 5 is moved forward to pressurize the 7 sixes 42 as shown in FIG. The remaining air in the cylinder and flux is gradually released from the hole 17. If the detection means detects that the flux pressure has reached a predetermined value (a state in which there is almost no air in the flux), the flow rate as shown in Figure 2 (C)
As shown in the figure, each cylinder 15 is operated in sequence and the stopper l1 is
3, the hole 17 is closed and the flux is applied to the forming cylinder 3B.
Prevent it from leaking outside. Therefore, the seven textures 43 in the cylinder 36 become molding flux, the partition plate 1B rises from the molding cylinder 3B, and the molding pressure piston 5 moves forward and is pushed out. The molded flux 43 is stopped by the flux holding piston 28 at a pressure slightly lower than the pressing force of the forming pressure piston 5, and the flux holding piston 29 is sequentially retreated (to the left position in the drawing) to the first The entire flux cylinder 1 is filled with the flux 44 shown in the figure, and the flux forming process is completed.

The deaeration hole 17 provided in the molding cylinder 3B is filled with flux 42.
Depending on the type of flux and its physical properties, the pressure of the flux 42 may increase, and a portion of the flux may enter after degassing and may be closed depending on the flux. In such cases, flux 4
In order to prevent the leakage of the air bubbles 1 and 2, move the stopper 1B forward and open the vent hole 1.
Clean the flux stuck in 7 and prepare for the next molding.

Next, the cylinder 1 is rotated 180 degrees and moved to the flux coating position to become the cylinder 1-2. The cylinder 1-2 slides with respect to the flux cylinder holder 20-2 by the air cylinder 23-2 and is press-connected to the die head 24, and the piston 7 at the rear of the flux cylinder 1-2 moves forward, causing the flux cylinder 1-2 to move forward. The molding flux 44 inside is extruded and painted onto the core wire.

Immediately after the flux molding and coating of the 7-lux cylinders 1, 1-2 are completed, each piston retreats, and the air cylinders 23, 23-2 are used to move the flux cylinders 1, 1-2 and the forming cylinder 36. After disconnecting from the die head 24, remove the flux cylinder l.
, l-2 is a rotating shaft 21 connected to a drive source (not shown).
It rotates 180 degrees around , stops at a predetermined position, and immediately starts molding and painting the next 7 luxes in the same manner as described above. Therefore, the flux cylinders 1 and 1-2 are rotated alternately between the flux forming position and the flux coating position to perform continuous coating.

FIG. 3 is another example of an apparatus for preforming flux, pressure forming, and filling a cylinder with forming flux, and is a sectional view showing the completion of flux forming corresponding to FIG. 2(C) described above. . In this example, the partition plate 18 shown in FIG. 2 is not provided, the preform cylinder 36-1 and the forming cylinder 36 are made larger in diameter than the cylinder 1, and a constricted part 38 is provided in front of the forming cylinder 3B. It is a device. This device preforms the flux 40 into a forming cylinder 3B.
A long molding flux 44-2 is obtained in the cylinder 1 by pressurizing and compressing while removing sufficient air.

The above illustrated example shows an example of the present invention, and may be modified as appropriate within the scope of the technical idea of the present invention.For example, the opening/closing mechanism of the air vent hole 17 may be changed, the air cylinder 2
3 on the base 8 and the flux cylinder L, 1
It is possible to appropriately adopt a structure in which the air cylinder drive shaft and the flux cylinder are connected and slid when the -2 is stopped. In addition, flux tank 35. Although the flux pushing device and air venting device are installed vertically.

In the drawings, the drawings are shown in a two-dimensional manner for convenience.

(Operation) Next, the operation of coating a welding rod core wire with flux using the apparatus of the present invention will be described.

First, the forming pressure piston 5 is at the rearmost position (FIG. 2a), the flux cylinder 1 is joined to the forming cylinder 36 by the air cylinder 23, and the partition plate 18 is lowered to close off the front of the forming cylinder 38. . A predetermined amount of flux 40 is cut out from the flux tank 35 and placed on the cutting plate 11.
is placed into the preformed cylinder 3B-1. The pushing plate 13 is lowered by the flux pushing cylinder 12, and the pushing plate 13 presses the flux supplied into the preforming cylinder 36-1 to preform it and perform preliminary air removal. By repeating this operation, when the cross section of the flux becomes the same size as the forming cylinder 36, the forming pressure piston 5 is moved forward to pressurize and compress the flux into the forming cylinder 36, and the air in the flux is released from the air vent hole 17. to be released. As the flux pressure rises to a predetermined pressure, the hole 17 is closed as shown in FIG. 2(C). The molded flux 43 created by completely deaerating the air in this way is moved up by the partition plate 18 to further move the pressurizing piston 5 forward, thereby moving the densely molded flux into the cylinder l. By repeating this operation, the molded pressure piston 5 shown by the dotted line in FIG.
Flux forming and filling is completed with 0 at the rearmost position.Flux cylinder 1 is then filled with flux.
is slid by the air cylinder 23 (for example, several layers,
(rotatable distance), the connection with the forming cylinder 36 is released, it is rotated 180' by the rotating shaft 21, and is replaced with the flux cylinder 1-2 which was at the flux coating position, and stopped at the flux coating position. , the flux cylinder l-2 rotates to the flux forming position and stops. The flux cylinder 1 (formerly 1-2) moved to this flux forming position is filled with forming flux in the same manner as described above.

On the other hand, the flux cylinder 1-2 (old 1) moved to the flux coating position slides forward within the cylinder holder 20-2 by the drive of the air cylinder 23-2, and is joined to the die head 24. At the same time as detecting the connection, the coating pressurizing piston 7 moves forward, and the flux cylinder l-2
By applying pressure to the flux 44, the flux is forced through the die head 24 and out of the tip die. On the other hand.

The core wire is continuously and concentrically fed from the core wire feeder 25, 28 at a predetermined speed to the tip die of the die head 24,
The flux is uniformly coated around the core wire and extruded from the die to form a coated welding rod, which passes through the cross conveyor 28, collides with a contact plate (not shown), is placed on a conveyor, and is sent to the next process.

Flux cylinder in the flux painting position! At the same time that all of the flux of -2 is pushed out under pressure, the painting pressurizing piston 7 moves back and is no longer inserted into the flux cylinder 1-2, and the connection between the flux cylinder 1-2 and the screw head 24 is also released. It will be in a state where it can be rotated and moved. Flux cylinder! During the time that -2 is in the flux coating position, the flux cylinder l in the flux forming position has also completed the entire process of flux forming and filling and is in a state where it can be rotated.
It is rotated 80 degrees to be interchanged, and the above operation is immediately repeated.

The present invention uses the structure and operation detailed above to coat the core wire with flux, and in addition to degassing during preforming, the forming cylinder is naturally coated with a large number of deaeration holes provided in the axial direction of the forming cylinder during flux forming. Since it has a structure that deaerates the product, the air remaining from the preforming can be easily released as pressure is applied, and the pressure molding is completed after complete degassing.
It is possible to fill a flux cylinder with a high density molding flux that does not contain air.

In other words, the wet-mixed flux in a loose state is formed by sequentially combining degassing preforming and degassing pressure forming, so the flux is highly dense and uniform, and does not contain air. Therefore, the coated welding rod As a result, it is possible to coat high-quality welding rods with a uniform coating outer diameter without eccentricity and a low shedding rate.

(Effects of the Invention) As detailed above, the coating coating apparatus of the present invention preforms flux and pressurizes it under degassing to form the formed flux and immediately uses it for coating. This technology solves the various problems associated with molding flux and allows for extremely high efficiency and very good painting. That is,
Fluctuations in the outer diameter of the welding rod that occur with conventional forming flux coating.

Eccentricity, coating cracking, etc. are completely eliminated, the appearance of the welding rod becomes beautiful, high-quality welding rods can be painted, and yields are greatly improved.

[Brief explanation of drawings]

FIG. 1 is an overall plan view showing a specific example of the coating apparatus of the present invention;
FIGS. 2(a), (b), and (c) are cross-sectional views explaining the operation of the device of the present invention, and FIG. 3 is a cross-sectional view showing another example of the present invention.
FIG. 4 is an overall perspective view showing a specific example of a conventional coating device, and FIG. 5 is a plan view of FIG. 4. 1.1-2... Flux cylinder, 4... Pressure cylinder for forming, 5... Flux forming piston, 6...
...painting pressure cylinder, 7...piston, 12...
Pushing cylinder, 13... Pushing plate, 1G... Stopper, 17... Deaeration hole, 18... Partition plate, 21
...Central axis, 35...Flux tank, 3B...
- Flux forming cylinder, 36-1... Preforming cylinder, 40, 41, 42, 43.44... Flux.

Claims (1)

[Scope of Claims] A coating material in which a pair of coating material cylinders are held interchangeably between two positions: a coating forming position and a coating coating position having a coating die head for discharging a coated welding rod at the front. In the coating equipment, a preforming cylinder is provided at the coating agent forming position to retain and preform a predetermined amount of the coating agent, and a pushing plate that moves up and down by a drive device is placed above the preforming cylinder. A molding cylinder is provided coaxially with the preforming cylinder in the middle of the preforming cylinder, and a plurality of air vent holes that can be opened and closed are formed in the molding cylinder along the axial direction. A coating coating device for a coated arc welding rod, characterized in that a piston is provided, and a pressure piston for coating is provided at a rear position of the coating cylinder at the coating coating position.