CN1088489A - The coating process of can seam and device thereof - Google Patents

Abstract

The present invention relates to a kind of method and apparatus of can seam coating, it adopts quick-hardening coating, and the space of post-processing step is reduced.In addition, because coating was in the original state that does not add processing before feed preparing device always, just can become then to applying required fluid state, thereby coating machine itself is also greatly simplified.

Description

The present invention relates to a method for coating weld seams of tanks, panels, automobile fuel tanks and other metal sheets or parts, and an apparatus for coating such welds.

A new panel or structure made by welding together single sheets of metal of different alloys and/or thicknesses, the components of which have different material properties. The space structure formed by deep drawing of this new composite plate has different characteristics in all directions due to different material properties. Carriers produced in this way, for example in the automotive industry, can have predetermined properties when these parts are subjected to accidental crashes, where a desired deformation of the crease zone is required.

Example: A car fuel tank is made of two deep-drawn halves that are welded together along their edges. Usually try to take advantage of the space factor of the device so that the weld is not on a plane but a three-dimensional curve.

For reasons well known in the art, different metal parts are often welded together in order to meet new requirements.

What these examples have in common is that after welding, especially after roll seam welding, the weld is protected to some extent by weld slag, but it is very rough and can easily corrode without protection. If there is no proper coating, usually brushing the newly created weld, removing the weld spatter, and oiling it may help.

It is therefore an object of the present invention to provide a method and a device by which a weld seam can be coated at an acceptable cost so that the weld seam is protected.

For the sake of clarity, the coating device of the tank body, that is, the coating method for the weld seam on the tank body is taken as an example below, which is only for the convenience of description, but the present invention is not limited to the application in the coating of the weld seam of the tank body.

Before the metal sheet is ready to be made into a metal container (such as a metal can, a storage drum, etc.), it is first coated or painted on the side that forms the inner wall of the container. These metal sheets are then bent or folded to form the container. Then the edges of the bent and folded metal plates are joined together, for example, with a tank welding device, but the coating is damaged in this way, and the original coating is removed during the melting process, and the weld seam is exposed to the car. up. This makes the weld vulnerable to corrosion, so it must be covered or/and coated with a suitable coating after welding.

Known plants for the continuous coating of tank welds comprise machines mounted on welding arms, operating downstream of the welding device. This coating machine applies wet nitro lacquer or powder coating to the weld seam of the tank body. It is arranged downstream of the welding device in the processing direction and mounted on the same processing arm as the welding head.

The coating machine must be designed to process freshly welded tanks moving at an average speed of 50m/min and a maximum speed of 100m/min. In the not-too-distant future, speeds of up to 130 m/min are possible, and there are already definite indications that even higher speeds are required. This means that for every second of coating the weld seam of the tank, the coating machine needs to pass more than 1-2m.

For example: wet paint method is known, namely the lower part of a roller rotates in the paint pool, and its upper part rests on the welding seam of the tank body being welded. Brush the paint from below onto the weld above with a roller. The cost of solving the problem by this method is high, but the equipment space required by this painting method is relatively small. However, to ensure the drying process, a large space is required, and the newly applied paint must be dried in a heating stage. It takes 15 seconds to ensure that the wet paint dries completely, which means that a post-processing stage of up to 15-30m is required. Moreover, the release of a large amount of solvent will pollute the environment and require a special discharge device.

A similar situation occurs when the powder is used as a coating. The powder is electrostatically charged and then applied to the weld at the coating. Similar to painting, it also requires a considerable expense in equipment. To prevent caking, the powder must be kept cool before coating and during application. The paint must also be electrostatically charged so that the paint is evenly distributed over the weld. Due to the characteristics of the powder, the whole operation process requires a humid environment, and also requires a post-processing stage of at least 20-30m. Because the powder is coated in a cold state, it needs to be heated above the melting point in the post-processing stage to melt the spring. Another disadvantage of powder coating is that the coating is relatively thick, which can be a decisive factor when manufacturing high-volume tanks. For example, a tank production line can process 500 tanks per minute, with two shifts, it can produce more than 500,000 tanks per day.

In general, existing tank weld seam coating machines have inherent disadvantages such as complex equipment and high cost, especially at the coating station, requiring a long post-processing stage, which is undesirable for the production line. In addition, large amounts of harmful solvents are released, especially in the case of powders, and large amounts of raw materials are consumed.

Therefore, the object of the present invention is to propose a method and a device for the coating of tank weld seams, with which post-treatment processes can be omitted, at least for the most part, or the post-treatment phase of the coating can be compressed to a minimum, Only a few meters long.

For this reason, the present invention provides a method for coating the weld seams of tanks, panels, automobile fuel tanks and other metal plates or metal parts with a coating that is liquid when coating, wherein the coating is composed of one or more Composed of multiple components, it cures in a short time after coating and can be completely hardened without further treatment.

In order to realize the above-mentioned method, the present invention provides a kind of device, and it comprises frame, driving device, control system, weldment (such as panel, automobile oil tank and other metal plates or metal parts, especially tank body) conveying system and paint coating The layer device is characterized in that it has a feeding system for conveying undisturbed paint (especially semi-finished products, and/or solid or non-solid components) and a material preparation device for preparing the paint to a suitable coating state, and the material preparation device is next to station 48 Before the coating is applied to the weld at station 48.

According to the technique described above, a coating is used that cures within a short time after coating of the weld seam, thus eliminating the need for post-treatment equipment. This allows for a considerable advance in the design of the tank welding line, as well as a considerable simplification of the tank coating system itself. After the coating has cured, full hardening (if required) can be done on the way to the next can body processing step.

In one embodiment, if the coating consists of a hot-melt substance or a molten adhesive, this has the advantage that, in addition to the original purpose, the post-processing stage can be completely dispensed with. Such hot-melt materials, also known as hot-melt compounds, or melt adhesives, are known in bonding technology and are commonly used to glue or join two workpieces together. Such hot melt materials are used on a large scale especially in bonding in the automotive, textile and packaging industries.

This hot-melt material is coated on the weld seam of the tank body, and it will cool and harden quickly, because the tank body will take away the heat of the weld zone in a few seconds, without the need for auxiliary cooling, so there is no need for post-processing .

Even if further heating is required, for example, in order to promote the polymerization of the coating or slow down the cooling rate, a heating section with a length of only a few meters is sufficient, which is unmatched by current equipment in the field.

According to another embodiment of the invention, since the coating is delivered to the coating in an insensitive state, the complexity of the equipment at the coating can be greatly simplified, especially the individual components of hot-melt materials or multi-component coatings Components can be delivered, stored and handled in their original state without problems.

In addition to the fulfillment of the original purpose, this has the advantage that no special protective measures are required between the preparation device and the coating location to prevent local hardening or foaming of the paint, or caking of the powder. Also, the use of hot melt materials eliminates the need for heated hoses to transport the paint to the coating location, thus eliminating the risk of hardened areas forming in the supplied paint. Otherwise, due to the several meters distance between the stock preparation unit and the coating location, especially during the maintenance of tank weld coating machines and/or the maintenance of its upstream welding equipment, there is a risk of lumping and hardening of the hose delivery.

The invention will now be described by reference to the Examples which are given by way of illustration.

Many of the examples described below relate to tank weld coatings. The coating unit can be used to coat panels or automotive fuel tank welds without requiring any modifications, if any, to them. The main modification is to arrange conveying devices according to the specific conditions of the workpiece to be coated. These conveying devices are well known in the art and are similar to the treatment required for welding seam cleaning, except that the coating device of the present invention replaces the cleaning. device.

In the picture:

Fig. 1 is a coating machine according to a first embodiment of the present invention, a storage tank for storing fluid coating is arranged in this coating device;

Fig. 2 is the coating machine of the second embodiment, and this coating device just handles the coating that is used for fast coating;

Figure 3a is a coating machine according to a third embodiment, wherein the coating device applies the coating to the weld seam of the tank body, and the fluid coating is obtained at the weld seam;

Figure 3b is a sectional view along the A-A direction in Figure 3a;

Figure 1 shows the welding device (1) and coating (2) joined together.

The welding apparatus has a frame 3 on which a rolling device 4, a welding arm 5 and welding rollers 6,7 are arranged. Can see the vertical displacement regulating device of welding roller 6 above from the figure. Also have the suspension support 8 and Z-shaped rail 9 of welding arm 5 on the figure. The tank body 10 that has just been rolled and also opened is located in the rolling device, and the tank body 11 near the welding device moves on the Z-shaped rail 9 . The tank body 12 is in welding position.

The frame 21 of the can body coating machine 2 is supported on the base 20 , and one end 22 of the frame 21 is fixed on the welding arm 5 . A conveying system 23 for conveying welded tank bodies is arranged on the frame 21 .

The conveying system 23 consists of belt conveyors 24, 25 and 26 for conveying the welded can bodies. The belt conveyors 24, 25 and 26 each consist of a pair of conveyor belts parallel to each other, so that the weld 54 of the tank body 12 (for example, located on the top of the tank) is located between the two sides of each belt conveyor 24, 25 and 26. Between parallel conveyor belts joined transversely. In conveyors 24 and 26 the cans are located above the conveyor belts, and in conveyor 25 the cans are suspended (for example by magnetic force) on two parallel conveyors.

Also on the rack 21 are heaters 28 and 29. The heater 29 is an auxiliary heating device, and the heaters 28 and 29 mainly heat the weld seam 54 on the tank body.

For the sake of clarity, all drives and controls of the can coater have been omitted from the figure. The driving and control device is a traditional structure, and is installed on the frame 21.

The paint 30 as a semi-finished product is wound on a roll 31 in a thread shape. The paint delivery system 35 includes rollers 36 that deliver the strand 30 . In order to advance the paint 30, the conveying system 35 also has a drive wheel 37 mounted in front of the coating device 40 (in the feeding direction). There is a material preparation device 41 inside the paint device 40, and a material storage tank 42 is attached to store the liquid paint.

The coater made of nozzle 43 communicates with the storage tank 42 through a pump, and in order to avoid confusion, the pump structure is omitted among the figures.

The adjustable pressure chamber 39, as a pressure sensor, is located above a part of the wall, is operatively communicated with the coating liquid in the storage tank 42, and is controlled by the device 2 to ensure that the pressure in the storage tank is within the required range. In this part, the control unit cooperates with the nozzle 43 valve.

Figure 2 shows a can coating machine 2 of the same type as in Figure 1, except that the stocking device 41 has been modified.

A material preparation chamber 44 is arranged in the material preparation device 41, and the linear paint 30 inside is directly fed through the driving wheel 37. The chamber is heated by means of a heater 45, either electrically, by microwave radiation or otherwise. The auger 46 in the figure conveys the paint to the nozzle 43 with the necessary pressure.

The screw conveyor here is equivalent to a pump for conveying paint. The mixing process of multi-component materials or the melting process of materials containing thermoplastic components is carried out in the space 44 . Accordingly, when a gradual mixing and melting process or increased pressure is required, this can be achieved by varying the helix diameter and/or the mandrel diameter and its helix slope.

Figure 3a shows a can coating machine 2 of the type shown in Figure 1, but here with a modified stock preparation device 41.

The stocking device 41 has an endless belt 52 which is driven around two stocking rollers 50 , 51 and which constitutes a device 60 for bringing the paint to the coating weld 54 . The material preparation rollers 50 and 53 cooperate together to play the role of driving rollers to bring the linear paint 30 onto the endless belt 52, and the paint can also be preformed by the rollers 50 and 53 simultaneously. The stock roller 51 presses the paint 30 onto the can 55 being conveyed there. The can body itself bears this pressure by supporting rollers 56, so that the lines of paint 30 are formed, see Fig. 3b.

Figure 3b shows a section through the back-up roller 56 and the roller 51 at the common contact point. The weld seam 57, the formed thread 30 and the endless belt 52 of revolution are shown.

Since there is an overlapping portion on the weld seam of the tank body, the step 58 needs to be covered by the accumulation of paint 30. Due to physical reasons, the paint has a tendency to spill laterally along the edge 59 of the step 58 during the melting process, thereby revealing it.

When the welding machine 1 works, the metal slab enters the rolling device 4, where the tank body 10 is rolled. The freshly rolled can wraps around the line of paint 30 that is delivered by rollers 36 . The conveying device that pushes the freshly rolled can body 10 to move forward is not shown in the figure, and the edge of the can body (that is, the can body 11 in FIG. 1 ) slides along the Z-shaped rail 9 . The tank body 11 continues to advance on the welding arm 5 after passing through the suspension support 8 of the welding arm 5 until the slit is welded by the welding rollers 6 and 7 at the tank body 12 position. The tank body 12 is still wrapped around the coating 30 and the welding arm 5, but has been welded closed into a cylinder.

After the tank body 12 that has just been welded is sent out from the welding equipment 1 , it is picked up by the belt conveyer 24 of the tank body coating machine 2 . Since the tank body 12 has been closed into a cylinder, all parts acting on the tank wall from the inside (including acting on the weld seam from the inside) are located within the scope of the frame 21 . End 22 is permanently coupled to welding arm 5 . When the tank body 12 passes through the conveying device 24, it is heated by the heater 28, mainly to keep the weld seam at a higher temperature, otherwise it will be gradually cooled after welding. The tank body 12 is then picked up by the conveying device 25, which is transported by the device to pass through the coating device 40, and the coating is prepared in the material preparation device 41. The process is as follows:

The semi-finished paint 30 is unrolled from the roll 31 in its original state and is sent to the stock preparation device 41 , at least partly by means of the conveying system 35 , with the aid of the roller 36 and the driving roller 37 . The feeding process of the raw paint 30 advances in a straight line without adding equipment. During maintenance, the can body coating machine 2 must be separated from the welding arm 5, and it is also more convenient to cut off the linear coating at this time. When the tank body welding coating machine 2 was running again, the two wire ends were connected very easily with tools such as soldering iron. Complicated and expensive pollution treatment equipment and special treatment to the conveying system 35 are unnecessary and can be removed.

The coating material 30 is pushed by the drive wheel 37 towards the material preparation device 41, where it is heated to a fluid state suitable for coating.

In the case of multi-component paints, the components can be mixed to achieve the desired state, for example, via the preparation chamber 44 of the preparation device 41 . If the paint contains at least one hot-melt substance, the hot-melt substance can be heated to a fluid state by the heater 45 . The paint to be coated is then pumped by a pump (omitted for clarity) from the reservoir 42 to the nozzle 43 of the coating unit. As long as the valve 47 of the nozzle 43 is open, the fluid paint for coating that is pumped is applied through the nozzle 43 to the tank body 12 that is being passed by the belt conveyor 36. The driving device of the can body coating machine 2 (for clarity, omitted in the figure) and the control system (also omitted) jointly coordinate the action of the nozzle 43, the delivery of the can body 12, and the action and operation of the pump in the preparation room 44. The action of the discharge system 35 driven by the driving wheel 37.

In this way, the whole process includes making the original paint into the fluid state required for coating in front of the coating point, and then coating it on the weld. The tank weld is heated by the heater 29 so that the freshly applied uneven paint by the nozzle 43 or the solid paint applied by the endless belt 52 on the tank wall flows.

It is also preferable to heat the nozzle 43 so that when the operation is interrupted, the hot melt material will not cool down.

The belt conveyor 26 picks up the freshly coated cans and transports them through an afterheater 29, where the afterheater is not necessary. However, since the metal wall of the tank body will quickly take away the heat from the weld, the newly sprayed hot melt will solidify immediately. Post-heating is done for aesthetic reasons to ensure that the solder coating has a shiny finish at the end.

When the hot-melt material needs to be polymerized, post-heating is also suitable. Usually, the duration of the polymerization process is longer than the natural cooling time of the weld.

The coating process begins when the coating is applied to the tank weld and ends when the coating is fully distributed on the weld. The paint hardens during conveyance by the belt conveyor 26 . Full hardening or secondary hardening can be done on the way to the next machining station without any post-treatment.

One advantage of the above can coating machine is that the length of the equipment itself is only 1/3 or 1/4 of the length of ordinary equipment, which is a great advantage in the overall layout of the production line. Moreover, since the paint 30 can be stored and handled in its original state (such as a semi-finished product) before coating, the design of the coating machine itself can be greatly simplified. Complicated, costly devices for coatings such as powders and paints that have partial hardening and caking problems (e.g. conveying hot-melt material from rollers 31 through heated hoses, from rolling device 4 via welding arms 5 to the equipment for stock preparation device 41) can be saved.

In particular, the above-mentioned equipment can process cans with smaller diameters.

These advantages are also given by the embodiment according to Figures 3a and 3b.

The linear paint 30 (also can be strip-shaped or other cross-sectional shapes) is drawn to the material preparation device 41 by the rollers 50 and 53, and is extruded and formed between the paint roller 51 and the tank body 55 when conveyed on the endless belt. Due to the effect of the heater 28, the tank remains heated, so that the coating 30 containing the hot-melt substance starts to melt immediately. The auxiliary heater 61 can help the paint to melt and stick to the tank body 55 quickly without any problems. It is also possible to melt the paint from the inside out, for which purpose a corresponding device can be provided behind the roller 51 .

A further advantage of this shaping is that an optimal distribution of the coating 30 over the weld can be achieved without a high degree of technical complexity and costs. It can be seen from Fig. 3b that there is a step 58 at the welding seam where the plates are overlapped, and the paint forms accumulations on the edges and corners 59, so that when the paint melts, the edges and corners 59 can be completely covered.

Another advantage of this embodiment is that no heaters and pumps are required to keep the fluid paint in the applied state and, of course, the nozzle 43 is not required.

This embodiment can provide a strong coating, and the composition of the can body coating machine 2 is relatively simple.

In addition to positioning and supporting the can body 55, the support roller 56 also has an additional function, that is, the can body can be conveyed by the belt conveyors 24, 25, 26 at constant minimum intervals by simple control. However, this means that during continuous coating, if no workpieces pass between the application roller 51 and the backup roller 56 , the backup roller 56 itself will be coated and this excess coating can be scraped off by the doctor blade 57 .

Of course, the backup roller 56 function can also be completed in the foregoing embodiments.

There is a situation not shown in the figure, that is, the paint of more than one composition can be used to be prepared in the stock preparation device 41, which allows the use of paint composed of various ingredients.

If the paint 30 is not loaded on the roll 31 as a semi-finished product with an optimal cross-sectional shape, a forming device, such as rollers 50 and 53, can be used to complete the forming operation.

The endless belt 52 may also be further passed through guides to guide the paint ahead of the paint station 48 for conditioning the paint. Conditioning may include softening of the upper surface by heating, or adding new paint components by dispensing means, or include a means for adding a softener.

Except the arrangement order of each device (drive device 35, preparation device 41, coating device 40) shown in the figure, also can rearrange, make shower head 43 be close at the back of welding roller 6,7, like this, heater 28 just can save. The paint can first pass through the aforementioned devices, pass the guide rollers arranged at the rear (based on the conveying direction of the tank), and then be conveyed back to the paint device in the direction opposite to the conveying direction of the tank.

Although the typical embodiment of the present coating apparatus is the coating of can body welds, the invention is not limited to the coating of can body welds.

The method of the present invention can also be used for the coating of metal panels (such as: deep-drawn panels), and its purpose and solution are basically the same.

Claims (29)

1, a kind of method of utilizing the coating that is in a liquid state when applying the weld seam of tank body, panel, automotive oil tank and other metallic plate or metalwork to be carried out coating, it is characterized in that: this coating is grouped into by one or more one-tenth, solidify in short time after the coating, do not need further processing to harden fully.

2, method according to claim 1 is characterized in that: described coating comprises a kind of thermoplastic material at least, preferably a kind of hotmelt substance or thermographic compound or melt adhesive.

3, method according to claim 1 and 2 is characterized in that: coating transforms from original state and is fit to the required fluid state of coating before applying moment or when smearing, and has a kind of thermoplastic composition fusing in the above in the described material at least.

4, according to each described method among the claim 1-3, it is characterized in that: described coating is fed in the coating machine (2) and applies with butt welded seam, described coating (30) is constant substantially before the upstream extremity of coating machine (2) plater (40) with its original state, be transported to feed preparing device (41) back coating and be converted into the suitable required fluid state of coating, comprise the thermoplastic composition fusing and/or with the mixing of other composition, here fluid-coating is stored in the material-stored pool (42) with fluid state, be coated onto on the weld seam by plater (40) when needing, can in time replenish by control device material-stored pool, replace the coating of ejection, make the coating content that is stored in the material-stored pool (42) minimum.

5, method according to claim 3, it is characterized in that: described coating is fed into coating machine (2) to carry out in the coating procedure with butt welded seam, the coating of reset condition is constant substantially before the upstream extremity that is transported to the plater of coating machine (40), coating is converted into the fluid state that is fit to coating then, comprise the thermoplastic composition fusing and/or with the mixing of other composition, the fusing here, the small part that is pumped to of mixing and fluid foods overlaps in same work step, as long as coating also is being coated onto tank body or panel, on automotive oil tank or other metallic plate or the metalwork, perhaps be coated onto on two workpiece of overlap joint element (52) at interval, above-mentioned work step is continuing always.

6, method according to claim 1 and 2, it is characterized in that: coating (30) best preprocessing before arriving the upstream that applies the position becomes the cross sectional shape of intermediateness, and be transported to the coating position with original shape, deform in the coating position and become the cross sectional shape that conforms to the weldment profile on one side, especially conform to the profile of tank body, the thickness of coating distributes consistent with weld seam 58,59 desired coating substantially in welded joints.

7, method according to claim 6 is characterized in that: coating position coating veers away tank body, panel, automotive oil tank or other metallic plate or metalwork with column, wire or strip on, make its fluidify state by heating then.

8, method according to claim 7 is characterized in that: heat effect to small part is the heating for weldment, especially tank body.

9, according to claim 7 or 8 described methods, it is characterized in that: adhere to weldment better especially on the tank body in order to make coating, (especially the coating that contacts of tank skin is preferably by heating and/or add another kind of composition and make its upstream at spraying position softening with the weldment surface at least.

10, according to each described method in the claim 4 to 9, it is characterized in that: weldment especially tank body remains on hot state at spraying position and upstream thereof always.

11, according to each described method in the claim 3 to 10, it is characterized in that: having a kind of composition in the coating (30) at least is with semi-finished product mode (wire especially, it more easily draws) be sent in the feed preparing device (41) of coating machine, it is effect by means of the pay-off (35) of above-mentioned feed preparing device upstream that semi-finished product are drawn to process to small part in the above-mentioned feed preparing device.

12, according to claim 2 or 3 described methods, it is characterized in that: the hot melt powder that is coated with is column, lenticular wire shape or strip, and/or the hot melt powder mainly is the thermoplastic polymer, and/or be a kind of polyester or copolyesters, and/or polyvinyl chloride, polyethylene, polyamide and copolyamide, and/or used thermoplastic polymer is that part is crosslinkable at least, and/or contain a kind of additive (as using adhesive) at least and improve bonding with the metal surface, and/or improve the flowability of hot-melt coating on weld seam (especially can seam) with a kind of flow enhancing agent.

13, realize the device of each described method in the claim 1 to 12.

14, realize the device of each described method in the claim 1 to 12 or 13, comprise frame (21), drive unit, control system, weldment is (as panel, automotive oil tank and other metallic plate or metalwork, especially induction system (24 tank body), 25,26) and paint coatings device (40), it is characterized in that it has one to carry original state coating (30) (semi-finished product especially, and/or solid or non-solid composition) feed system (35) and coating is modulated to the feed preparing device (41) that is fit to coating state, feed preparing device (41) is right after in the front of station (48), and coating is painted on the weld seam (54) at station (48).

15, for realizing in the claim 1 to 4 device of each or claim 12 or 13 described methods, comprise frame (21), drive unit, control system, weldment is (as panel, automotive oil tank and other metallic plate or metalwork, especially induction system (24 tank body), 25,26), coating induction system (35) and paint coatings device (40), it is characterized in that: it has the material-stored pool (42) of a store fluid coating and puts upstream at plater, and a heater that is used for the melting heat moulding material (45) that matches with material-stored pool (42), and/or is used for the mixing arrangement of coating different components mixing.

16, device according to claim 15 is characterized in that; Material-stored pool (42) is an enclosed construction, and its liquid level is by sensor, preferably pressure sensor (38) detects.

17, device according to claim 16 is characterized in that; Sensor (38) is to constitute with the form of chamber (39), and its volume preferably can change according to pressure, cooperates jointly with coating storage in the material-stored pool, and the pressure in the material-stored pool is measured by the volume of described transducer room (39).

18, realize the device of each described method among the claim 1-12, comprise frame (21), control system, drive unit, weldment is (as panel, automotive oil tank and other metallic plate or metalwork, especially induction system (24 tank body), 25,26), coating induction system (35) and paint coatings device (40), it is characterized in that it has the feed preparing device (41) of a modulation fluidised form coating to be arranged in the upstream of plater (40), feed preparing device (41) has a heater (45) and a preferably heated pumping installations (46), and it acts on the above-mentioned same chamber of feed preparing device (41).

19, device according to claim 16 is characterized in that pumping installations is made of a single head or multi-head spiral conveying device, and its diameter and/or pitch increase along the pumping direction, and pumping installations itself is heated.

20, realize the device of each described method among the claim 1-12, comprise frame (21), drive unit, control system, weldment is (as panel, automotive oil tank and other metallic plate or metalwork, especially conveying device (24 tank body), 25,26), coating induction system (35) and paint coatings device (40), it is characterized in that: plater (40) comprises paint feeding device (60), and coating is transported to position while welding (54) on the tank body (12) with original state, and described feedway preferably is provided with and allowed it remain on the device of position while welding before coating becomes fluidised form.

21, device according to claim 20 is characterized in that it has a heater (61) in the upstream of paint coatings station (48) (being as the criterion with the weldment throughput direction) at least, is used for heating can seam coating (30) is melted on the weld seam.

22, according to claim 20 or 21 described devices, it is characterized in that: plater has a heater, be used on the heated wall coating and/or in coating place upstream facing to the coating of weldment one side.

23, according to each described device among the claim 13-21, it is characterized in that: the most handy device (50,53) coating is shaped, plater has at position while welding (54) makes coating form the device (52) of predetermined cross section (62).

24, device according to claim 23 is characterized in that: the device of described formation predetermined cross-sectional (62) comprises a shaping roller, with the workpiece acting in conjunction of single welding, the coating that be coated onto on the workpiece is shaped.

25, device according to claim 24, it is characterized in that: the device that forms predetermined cross-sectional (62) comprises a shaping endless belt (52), transmission is carried out around roller in the endless belt, the coating that cooperates with workpiece that each welded and will be coated onto on the workpiece is shaped, and forming belt (52) is positioned near being used for preliminary treatment and is placed on the zone of the device that band coats.

26, a kind of coating that is used in according to the described method of claim 1 to 12.

27, a kind of coating that is used in according to the described device of claim 13 to 25.

28, according to claim 26 or 27 described coating, it is characterized in that: it is shaped as a kind of coiling that is, and is preferably the semi-finished product of wire.

29, according to the described coating of claim 26 to 28, it is characterized in that: described coating is made up of more than one component, and having a kind of component at least is that the basic shape form that is raw material is separated with other component.

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