JPS5850142B2 - Continuous enamel coating equipment for tubes - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an enamel application apparatus, and more particularly to a continuous enamel application apparatus for tubes.

The technique of enameling in kilns, which is constantly being improved with the development of new modern machinery, is practiced today throughout the world.

Moreover, the use of firing kilns, as a device for protecting metal products in various industrial fields, limits the industrial substrates on which glass enamel can be applied, creating a major obstacle in the development of enamel application technology. be.

This is a missed opportunity to monitor and control the process of fusing fired kiln enamel slips, thereby exposing the fine skin slips to extremely high fracture temperatures.

Additionally, the use of firing kilns requires additional self-contained equipment for applying the enamel slip, drying the coating, straightening and cooling the tubes occupying the temporary floor surface.

Modern firing kilns have heavy-duty telescoping hoists and large mechanical, fluid, and electrical equipment to maintain high processing temperatures within the kiln.

This makes operation difficult and makes the device a complex mechanical device.

The enamel applied to the tube must have a high strength 75: and must be of uniform thickness throughout.

However, in the firing kiln, the tube undergoes bending,
This drawback also reduces the quality of the applied metal coat.

To eliminate the bends, straighteners are used and make the enamel application device as a whole a more complex mechanism.

The above-mentioned disadvantages are overcome by an induction heating process for tube enameling, which makes it possible to apply the enamel coating layer continuously to the inner or outer surface of the tube or to both surfaces at once.

Under this method, an enamel slip is applied, dried,
All operations of fusing and cooling can be accomplished sequentially and simultaneously.

The capacity of the induction enamel application method is 5 to 5 times the capacity of the kiln method.
8 times, and moreover, the induction method used is especially effective without peeling off the entire coating layer (local defects can be eliminated).

The disadvantage in the case of the kiln method is the peeling off of the enamel layer from the metal surface 75 = re-enameling of the entire tube surface starting with and finishing with multiple cycles of enamel slip application to dry and fuse the coating layer. By,
Or it can be repaired by applying a platinum or gold filling to the avulsed area.

Apparatus suitable for tube-guided enamel application methods are well known in the art (see, for example, German Patent No. 2,503,232), which apparatus can raise the tubes from a feed conveyor and move them from a horizontal position to a vertical position. an appender equipped with a gripper capable of displacing the tubes; a device for applying an enamel slip on at least one side of each tube remote from said appender; a heating device designed to dry and fuse the enamel slip; be careful not to use the retraction device during all processes.

Two rotors 25 installed perpendicularly one after the other are used as a drawing device, the rotors having grippers to hold the tube in an upright position during the drawing and processing operations, and one roller holding the tube in an upright position. performs loading and unloading functions, and the other rotor moves the tube from one work station to the next.

A transfer device -b= is used to move the tube from one rotor to the other.

A conveyor that moves the tube horizontally runs adjacent to the loading/unloading rotor, and the conveyor has a telescoping appender that holds the tube in a vertical position as it is transferred to the loading/unloading rotor. It is possible to return the tube to a horizontal position when placed and removed from the tube roll.

Each tube has a removable cap attached to one end thereof, which attaches the tube to the loading/unloading o-J and to the carriage of the work rotor moving along a vertical guide.

In the previously known apparatus, two workstations
Vertical position 7' of the tube during the operation of applying the enamel slip to two layers, namely the skin coat and the top coat (during the operation of drying and fusing the enamel slip)
The challenge 75 arises that it is disturbed integrally with 1f-1 and during the process of moving along the vertical guide from one station to the next.

Furthermore, the stoppage of the rotor causes the tube to oscillate, thereby disturbing the alignment in the areas where the enamel slip is applied, dries and coalesces.

This will damage the enamel covering layer, reduce the capacity of the device and further impair safety for personnel.

The presence of two working stations for the application of the enamel slip complicates the construction of the device and extends the course of the enamel application with two continuous paths running through each tube-IJ.

The use of two vertical rotors placed one after the other complicates the construction of the device and requires the tube to be moved from one roller to the other.

The fact that the guide 75 with the carriage is attached to the two working rolls adds to the weight of the rotating parts and causes the passages that are to be covered in the course of the tube section to be elongated.

This impairs the operational reliability of the apparatus as a whole, except for the obvious ability of conveyors and appenders of conventional construction to transport tubes by a certain length and diameter from a horizontal position to a vertical position.

The fork-type grippers on the rotor cannot be cleaned when enameling tubes of various diameters; these grippers function as appenders that move the tube and pull it along the guide of the carriage by the rotor. reliability cannot be ensured, and as a result, safety for people cannot be ensured.

The object of the present invention is to overcome the above-mentioned disadvantages and to provide a device for continuous enameling of tubes which gives reliable performance and exhibits a higher capacity than hitherto.

an appender having a gripper for receiving from the tube supply conveyor and transferring it from a horizontal position to a vertical position;
a mechanism for applying an enamel slip to at least one side of the tube leaving the appender; a heating device for drying and fusing the enamel slip; and a device for drawing the tube through all stages of the process. In the device for continuous enameling of tubes, the avengers 3 are constructed as booms 4 and arranged in parallel planes for transferring the tubes from the appenders 3 to a trolley 18 arranged in the drawing device. The trolley 18 is mounted to move along the guides 10 and 14, which have a movable part 22 and a stationary part 21, which move together with the tube 8 in a vertical plane during the enameling process. It is distantly related by an apparatus for continuous enameling of tubes, characterized in that it is 20.

Two guides are placed on all sides, one guide on each - 73? - having said parts, both guides are arranged with respect to each other in such a way that the horizontal part becomes a common part of the two guides and the vertical part "I)" is parallel to each other;

The mold is formed in the form of a divisible ring with alternating sections, and a guide 75 is arranged within the movement area of the movable part of the mold, along which guide the movable part of the mold is moved. is moved and the guide is attached to the post.

An advantage of the invention is to have a streamlined device that incorporates a mechanism that prevents the tube from swinging in the vertical position.

Another point is centered when painting the tube and moving the enamel slip up and down to the area to dry and fuse.
Therefore, not only is the process of applying the enamel slip substantially simplified, but also it is possible to obtain a good coating layer and maintain optimal conditions for drying, fusing and cooling the enamel. It means that it can be done.

Another effect obtained by the invention is that the retraction device 7'
1; formed into the disclosed appender with a guide that allows the manipulation of the tube to apply enamel on both sides of the tube despite varying lengths and diameters;

Another advantage of the invention is the compact layout of the annular divisible mole, which avoids a stationary part and a movable part that moves along a guide.

This reduces the floor space required for the device, reduces the metal material needed to manufacture the device, and also allows for varying degrees of enamel application and the ability to retain a specific amount of coating layer. can.

In summary, the device is a high capacity, low weight rotating element, a relatively simple device for retracting the further advanced tube at the same time, and a low overall weight.

This reduces the percentage of enamelled tubes that can be picked up and reduces the cost of the tubes.

The basics of the invention will be understood in more detail by the preferred embodiments described with reference to the drawings.

In order to process a given process, the apparatus has a subsequent work station as shown in FIG.

a, Station for transferring the tube from horizontal to vertical position.

b. Station for applying enamel slip to the tube.

C. Station for drying enamel slips.

e1 to e4 Stations for cooling the metal tube with the coating layer.

Work station a of this device includes a roller conveyor 1 (Fig. 1) equipped with telescopic rollers and an appender 3 (
Appender 3
consists of a boule 4 with rollers 5.

On the boom 4 there is a gripper 1 that can be adapted to the tube diameter, i.e. a pivoting (white) type gripper 67 with a fitting jaw 6a and a gripper 7 at the bottom! l: Attached.

Both grippers 6 and 7 are actuated, for example, by pneumatically actuated sills.

The gripper grips the tube with a small gap to avoid damaging the enamel.

Furthermore, the tube 8 has a mounting cap 9.

The boom 4 of the appender 3 can run along curved guides running in vertically parallel planes, one guide in each plane or two guides in each plane.

In the former case, the guide 10 (FIG. 2) has three parts: a horizontally arranged part 11, a part 12 adjoining said part 11 and extending substantially at an angle to the horizontal; 12 and a substantially vertically extending portion 13.

In the latter case, the guide 10 (FIG. 3) is connected to said portion 11.
12.13, the guide 14 is formed from a portion 15 extending at an angle to the horizontal and a portion 16 extending substantially vertically and arranged adjacent to said portion 15.

The two guides 10 and 14 are arranged with respect to each other in such a way that the horizontal portion 11 is common to both guides and the vertical portions 13 and 16 extend parallel to each other.

A winch 1F is integrated into the appender 3, which allows the tube 8 to be transferred from a horizontal position to a vertical position and vice versa.

A trolley 18 with a pivoting self-locking gripper 19 (FIG. 5) is located at work station b (FIG. 1) of the device.
The gripper 19 holds the tube 8 in a vertical position via the mounting cap 9.

The trolley 18 is an annular splittable mole rail 20 (Fig. 2)
placed in a retraction device consisting of.

The mole rail 20 is composed of a stationary part 21 (FIG. 6) and a movable part 22.

Furthermore, in work station b (FIG. 1), an applicator 23 is utilized which is capable of applying an enamel slip in two containers 24 and 25 containing a skin coat and a top coat, respectively.

A device consisting of a drive motor 26, an operating crank 27 (FIG. 4), an arm 28 and a star wheel 29 linked with said arm 28 is used to pull the trolley 18 carrying the tube 8 around the mole rail 20. do.

The end of arm 28 has a fork 30 (FIG. 8) whose slot is vertically oriented.

The trolley 18 is held in engagement with the fork 30 by a pin 31.

The carriage 32 (FIG. 9) to which the movable part 24 of the mole rail 20 is attached is a work station.

(Fig. 1). The carriage 32 has an automatic safety catcher 33, a model catcher which normally acts in case of rope breakage and a movable part 22 of the mole rail 20.
It has a follower Shio Eve's Ares Shio-34 to serve for mounting the trolley 18.

Carriage 32 (FIG. 2) is vertically positioned by driver 37 (FIG. 2) along guide 35 (FIG. 9) attached to column 36 (FIG. 2).

In order to ensure that the movable part 22 of the mold 20 is aligned with the stationary part 21 and to eliminate shocks, the rope of the driver 37 is connected to a movable pulley block 38, a counterweight 39, and a spring 40.
and a limit switch 41 via a buffer device.

When the tube 8 is moved up and down, the induction heater 4
2 and a special device from the shaft 43 is used for drying the tube 8 coated with water enamel slip.

Work station d is located on the same line as work station C.

Devices 44 for forced cooling of the enamelled tubes 8 are arranged at the work stations e1 to e4.

The disclosed device operates in the following manner.

The tubes 8, previously shot blasted or cleaned, are loaded onto a conveyor 1 with telescopic rollers 2 and then fed from a boom 4 with grippers 6 and 7 to an appender 3. .

When the roller 2 crab is retracted downward, the appender 3
The tube 8 is placed in a vertical position with the help of the winch 17, and the mounting cap 9 is then fitted in a secure manner into the pivoting self-locking gripper 19 of the trolley 18. It is moved along the guide 10.

The winch 17 is stopped with the aid of a matching limit switch so that different lengths of the tube 8 raised into the annular mold 20 can be adapted.

Since a gap exists between the crab tube 8 and the grippers 6 and 7, the boom 4 can be freely lowered to a predetermined height with the grippers closed.

Next, the pivot type gripper 6 is opened following the applied signal φ nigeripper 7.

However, if it is not possible to clamp the gripper 19 cannula tube, the pivoting gripper
6 does not release its hold on the gripper due to the presence of jaws 6a that fit into the bore of tube 8.

The trolley 18 on which the tube 8 is suspended is set in a moving state by engaging the arm 28 with the cannibal fork 30 and the pin 31.

The arm 28 is actuated by a device consisting of a drive motor 26, a crank 27 and a star wheel 29 linked with said crank.

That is, the arms 28 rotate intermittently in accordance with the operations performed on the tubes being processed at the work stations a@be Cm de el to e4 simultaneously and independently of each other.

Trolley 1875' Once stopped at work station b, the trolley 18 is placed on the movable part 22 of the mold 20.

The enamel slip is applied to tube 8 by spraying using device 23 or by dipping into containers 24 and 25.

When performing an immersion operation, the tube 8 is moved to the carriage 32
A guide 35 integral with the movable part 22 linked to
It is moved in the vertical direction by a trolley 18 fixed to the movable part 22 of the mortar 20 by a driver 37 and a trailing type arrester 34 which lowers the carriage 32 along the movable part 22 of the mold 20.

If the rope is damaged, the safety catcher 33 is operated to prevent the gutter 8 attached to the carriage 32 from falling to the bottom.

The tube 8 is moved up and down at the speed required for a predetermined process.

The fork 30 is mounted on a trolley 18 mounted on a carriage 32.
The carriage 32 is specially designed to be integral with the tube 8 and move the carriage 32 vertically.

When the tube 8 is returned to the initial position, the molle 20
The movable part of is set at the same level as the stationary part 21, and the pin 31 of the trolley 18 engages the fork 30.

Accurate alignment and damping of the movable part 22 with the stationary part 21 is achieved by the counterweight 39 rising and acting on the limit switch 41 to shut off the driver 37.

The operation for applying the enamel slip is at work station B.
However, drying and dissolution are carried out at work stations C and d, respectively, and are accomplished using conventionally known techniques of moving the tube 8 vertically through the heater 42 in the same manner as work station b. be done.

This is achieved as a continuous enamel application process! I can do 52.

To cool the tubes 8 in the working stations e1-e4, forced draft cooling devices 44 are used or natural cooling takes place.

The cooled tube 8 is removed from the device by the appender 3, the removal effect being carried out in the opposite manner to that described above.

Additionally, the enamel application cycle is repeated if multiple coats are applied.

When removing the tube 8 from the trolley 18, the pivoted gripper 19 is forced apart by some actuating device.

[Brief explanation of drawings]

Figure 1 is an exploded view showing the flowchart of the tube drawing process and enamel application process, and Figure 2 is the topmost position of the appender's boom when feeding the tube into the device and removing the tube from the device. 3 is a schematic diagram showing the appender with two guides arranged in each vertical plane; FIG. 5 shows a plan view of the annular molar rail with carriages and their drive and is taken along the line IV--IV of FIG. 2; FIG. 5 is a closed partial sectional view of the auxiliary assembly A of FIG. 2;
6 is a partial schematic view of the auxiliary assembly C shown in FIG. 4, FIG. FIG. 9 is a closed partial cross-sectional view of the auxiliary assembly of FIG. 2; 3...Appenda, 10.14...Guide, 4...Hoom, 18...Lolly
8...tube, 20...mole rail, 21...immovable part, 22...movable part, 35...guide, 36... ...Strut.

Claims (1)

[Scope of Claims] 1. An appender having a gripper for receiving a tube from a supply conveyor and transferring it from a horizontal position to a vertical position, and a mechanism for applying an enamel slip on at least one side of the tube leaving the appender. An apparatus for continuously enameling tubes, including a mechanism, a heating device for drying and fusing the enamel slip, and a device for drawing the tube through all stages of the process.
The appender 3 is constructed as a boom 4 and equipped with a trolley 18 arranged in a device for pulling the tube from the appender 3.
guides 10 arranged in parallel planes for transfer to
and 14, and the trolley 18 is a mold 20 having a movable part 22 and a stationary part 21 which move together with the tube 8 in a vertical plane during the enameling process. A device for continuously enameling tubes, characterized by: 2. Device according to claim 1, characterized in that the guides 10 and 14 are oriented relative to each other so as to have a common horizontal section. 3. The mold rail 20 is shaped as a bearing ring, the stationary part 21 and the movable part 22 of which are made alternately, and the guide 35- is made in the area of displacement of the movable part 22 of the mold rail 20
75; the device according to claim 1, characterized in that the movable part 20 of the mold 20 is provided and moves along the guide, the guide 35 being fitted onto the canopy post 36; .