JPH06200359A - Hot-dip metal coating system - Google Patents

Abstract

PURPOSE:To provide a hot-dip metal coating system having simple and inexpensive structure, capable of saving manpower and capable of reducing spaces between the devices in the respective stages. CONSTITUTION:One to four manipulators 10 are provided with the carrier 14 connected to the tip of the arm 13 which is turned, lifted up and down and oscillated. A load stage 3 on which a pretreated work is placed, a kettle 4 contg. a molten metal, a centrifugal separator 5 for removing the excess molten metal on the work, a flux tank 6 and a means for cooling the work surface- treated in the tank 6 are arranged below the traveling line A-B of the carrier 14.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to hot metal plating systems.

[0002]

2. Description of the Related Art Hot-dip metal plating is plating formed by immersing iron or steel in a molten metal such as zinc and depositing a thin plating layer on the surface. For example, zinc is more ionizable than iron. Since it is large, the inner iron is protected while the zinc on the surface is consumed by oxidation and the like, and is widely used for the purpose of preventing corrosion of steel products.

The procedure of hot-dip metal plating is usually a degreasing treatment, a pre-treatment such as pickling, a pre-treatment such as flux addition, a dipping of a work in a molten metal, a removal of excess molten metal,
Each step of surface treatment with ammonium chloride and the like, cooling of the work and finishing is sequentially performed.

The work which has completed the previous process is placed at a predetermined position, and is sequentially carried in or loaded into a device for processing each process, and when each process is completed, it is carried out or pulled up from the device and processed for the next process. It is carried in or thrown into the equipment. The work transportation work including the lifting and unloading of the work from the equipment for processing each process and the loading and unloading of the work for the processing equipment relies on human labor.

[0005]

In this manual carrying work, for example, in order to process the above-mentioned steps, one to two persons are required to carry the work until the molten metal kettle is charged, from the ash scraper and the molten metal kettle. 1-2 people for transportation until it is pulled up and carried into a centrifuge for removing excess molten metal, 1-2 people for transportation until it is taken out of the centrifuge and put into a flux tank for surface treatment, flux 1-2 workers are required for transportation from the tank to the cooling tank and a total of 6 to 7 workers are required.

[0006] In particular, in order to continuously process a large number of small items such as bolts and nuts and deformed materials in large quantities, skilled workers are required, and the problem of labor shortage becomes more serious.

In carrying out hot metal plating, the most effective means for solving the shortage of manpower is the work relying on manpower, in particular, lifting or unloading the work from the stage for processing each process and each process. Mechanization of work transportation work including loading and unloading into a processing stage.

The first thing that comes to mind as mechanization of transportation is to use a conveyor such as a mesh conveyor or a belt conveyor that carries a work on top of it, but when the work is immersed in the molten metal, the conveyor is used. Mesh of the
Since the molten metal adheres to a carrier medium such as a belt, it is impossible to use a carrier device before and after the immersion step in the molten metal. In addition, before and after the surface treatment, the carrier medium of the carrier equipment is required to have chemical resistance to a surface treatment liquid such as ammonium chloride, which is expensive, which is not preferable.

The next possibility is to suspend and convey the work on the hanger conveyor, but it is necessary to move the work up and down in each process such as loading into the molten metal pot and pulling up from the molten metal pot. There is.

When the transport path is provided up and down on the hanger conveyor, it is necessary to provide inclined portions before and after the height change, which makes the transport path unnecessarily long and increases the interval between the equipments for processing each process. I have to take it. For this reason, it is necessary to widen the site of the factory, which is not practical.

Therefore, it is conceivable to hang a carrying device that moves up and down or vertically expands and lowers on a hanger conveyor to support the work and carry the work. According to this idea, the work can be moved up and down at the position of the equipment that processes each process, so by shortening the interval between the transport path and the equipment that processes each process, it is not necessary to expand the factory site. .

However, according to this idea, the carrier is required to have heat resistance against heat received while it is standing by on the molten metal kettle, and the carrier having an elevating function or a telescopic function is moved. However, there is a problem that the processing of the wiring is complicated and the equipment cost is considerably high.

The present invention has been made in view of the above circumstances, and has a simple and inexpensive structure, which can achieve labor saving of molten metal plating, and moreover, of an apparatus for processing each step. An object of the present invention is to provide a hot-dip galvanizing system that can shorten the interval.

[0014]

In order to achieve the above object, the present invention, for example, as shown in FIG. 1, includes a load stage 3 on which a pretreated work is placed, and a molten metal pot for containing molten metal. 4, a centrifuge 5 for removing excess molten metal adhering to the work, a flux tank 6, and a cooling means 8 for cooling the surface-treated work in the flux tank 6.
And a manipulator 10 for transporting the work.

The manipulator 10 includes a base 11 installed on the ground, an arm 13 supported by the base 11 so as to be capable of turning and moving up and down, and a carrier 14 supported at the tip of the arm 13.

Further, the load stage 3, the molten metal pot 4, the centrifuge 5, the flux tank 6 and the cooling means 8 are arranged below the movement loci A and B of the carrier 14 of the manipulator 10.

[0017]

The manipulator 10 may have a carrier 14 configured to support or release a work or a container containing the work. The carrier 14 supports the work or the container containing the work to support the arm 13 By moving up and down, the work or the container containing the work can be moved up and down on the spot.

Further, by rotating the arm 13 with the work or the work being lifted, the load stage 3, the molten metal pot 4, the centrifuge 5, the flux tank placed on the moving paths A and B of the carrier 14. 6 and cooling means 8
It is possible to move the work or the container accommodating the work.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The hot metal plating system according to one embodiment of the present invention will be described below with reference to FIGS. 1 to 5.

FIG. 1 is a plan view of an embodiment of the present invention,
In this embodiment, the present invention is applied to a hot dip galvanizing system in which various kinds of small objects such as bolts and nuts are continuously processed to form galvanization.

The pre-processed work is put into a hopper 21 with a dryer or a hopper 22 with a vibrator provided on the loading stage 2, and further, an empty basket placed on the loading stage 2 from these hoppers 21 and 22. The work is put into 1.

The car 1 into which the work is loaded in the loading stage 2 is transported to the load stage 3 by the transportation means 30. The conveying means 30 is composed of a roller conveyor 31 that constitutes the loading stage 2, a table lifter 32 that is provided continuously to the roller conveyor 31, and another roller conveyor 33 that is higher than the loading stage 2 by one stage. .

Load stage 3 on roller conveyor 33
It is not essential to the present invention to make the height higher than the loading stage 2, but here, the height of the car 1 placed on the load stage 3 is released from the carrier 14 of the manipulator 10 described later by the zinc pot 4. In order to make the height of the basket 1 uniform and to minimize the vertical movement when the carrier 14 of the manipulator 10 described later picks up the basket 1, that is, in order to shorten the moving time within the turning radius of the manipulator, the load stage 3 Is higher than the loading stage 2.

It should be noted that the work already placed in the car 1 in the pretreatment process can be directly carried into the load stage 3. The car 1 carried into the load stage 3 is hoisted on the spot by the manipulator 10 and carried in above the zinc pot 4.

As shown in the side view of FIG. 2A and the plan view of FIG. 2B, the manipulator 10 is provided with a base 11 installed on the ground, and is rotatably supported on the base 11. The swivel base 12, the arm 13 supported by the swivel base 12 so as to be able to move up and down, and the carrier 14 supported by the tip of the arm 13.

The arm 13 is composed of a proximal main arm 13a and a distal main arm 13b.
A link 13c, a link 13d, and a link 13e are provided for vertically moving the 3b and the base main arm 13a.

Then, the hydraulic lifting cylinder 15a is expanded and contracted to move the entire arm 13 up and down around the proximal end of the proximal main arm 13a, and the hydraulic expansion and contraction cylinder 15b is expanded and contracted to move the proximal main arm 13a and the distal main arm. Arm 13
The tip main arm 13b is expanded and contracted around the contact point with b to adjust the horizontal distance from the turning center to the carrier 14. Then, the horizontal distance from the turning center to the carry device 14 is kept constant, and the turn drive device 16 turns the turn base 12 and the arm 13 to move the carry device 14 to the position shown in FIG.
As shown in, it is possible to move on an arc-shaped movement locus A.

The carrier 14 is attached to the lower ends of the brackets 14a at the tips of the tip main arm 13b and the link 13e, and a pair of clamps 14b that open and close in the horizontal direction.
And a rotary drive device 14c for rotating the motor in both the forward and reverse directions with respect to the horizontal axis direction.

The clamp 14b is opened and closed by a hydraulic opening / closing mechanism portion 14d supported by the base portion 14a, and the clamp 1
4b is provided with a slide metal fitting 14e connected to one end, a clamp head 14f attached to the tip of the slide metal fitting 14e, and an ash scraping tool 17 supported by one clamp 14b.

As shown in the side view of FIG. 3 (b) and the front view of FIG. 3 (c), each clamp head 14f has a chuck claw 14g protruding outward, and both clamp portions 14b.
When the is opened, the chuck claws 14 are
The car 1 is supported by piercing g.

The ash scraping tool 17 is shown in the plan view of FIG.
As shown in the side view of (b) and the front view of FIG.
The top of the work in the car 1 is cleaned by being supported by one slide fitting 14e so that its tip is located farther than the center of rotation of the clamp 14b than the tip of the clamp head 14f, and the clamp 14b is rotated. I can do it.

All the operations of the manipulator 10 are performed by one operator on the operation platform 18. After the car 1 and the work carried into the zinc pot 4 have passed a predetermined time or more, the car 1 is removed by the ash scraper 17.
A so-called ash scraping is performed to clean the upper surface of the work inside, and after this, the basket 1 containing the work is pulled up from the zinc kettle and carried into the centrifuge 5.

The manipulator 10 is a centrifuge 5.
After the car 1 is loaded, the clamp 14b is closed to release the car 1 and then the carrier 14 is moved to the load stage 3
It will be returned to its original position located in.

The cage 1 carried into the centrifuge 5 is rotated at high speed in the centrifuge 5 to remove excess zinc attached to the work and the cage 1. Then, after this, the car 1 is carried out from the centrifuge 5 by another manipulator 10,
The surface of the work is beautifully finished by carrying it into the flux tank 6 and immersing the work in the flux.

The other manipulator 10 is constructed in the same manner as the first manipulator 10, and the movement locus B of the carrier 14 is intersected with the movement locus A of the carrier 14 above the centrifuge 5. Further, all the operations of the other manipulator 10 are configured such that one operator performs the operation on another operation platform 19.

The car 1 is immersed in the flux for a certain time while being supported by the carrier 14 of the manipulator 10,
The flux is unloaded from the flux tank 6, loaded into the reversing machine 7, and released from the carrier 14 of the manipulator 10 on the reversing machine 7.

After that, the car 1 is turned over by the reversing machine 7, and only the work inside is put into the cooling means 8. The reversing machine 7 is shown in a plan view of FIG. 4A, a front view of FIG.
As shown in the side view of (c), a base 71, a support shaft 72 reversibly supported by the base 71, and both ends fixed to the base 71 so that the support shaft 72 can be inverted. The reversing table 73 is provided, and a driving device 74 for reversing the reversing table 73 between a horizontal position and a vertical position.

A pair of engaging members 75 for engaging the upper edge of the car 1 are erected at the rear of the reversing table 73, and the reversing table 7 is also provided.
A weir plate 76 is provided at the front edge of 3 to prevent the car 1 from slipping down. After the car 1 is carried in by the manipulator 10, the car 1 is inverted by reversing the reversing table 73, and the work in the car 1 is inverted. Are dropped on the cooling means 8.

Water is contained in the cooling means 8 as a cooling liquid, and the work is cooled by this cooling liquid. Further, as shown in FIG. 1, the cooling means 8 has a hopper 81 for receiving a work falling from the reversing machine 7, and a discharge conveyor 8 for carrying out the work dropped in the hopper 81 to the outside of the cooling means 8.
2 are provided. As shown in the side view of FIG. 5, the discharge conveyor 82 includes an idler 82b rotatably supported at one end of a frame 82a, a drive roller 82c rotatably supported at the other end of the frame 82a, and an idler 82b.
And a mesh belt 82d made of stainless steel wound around the drive roller 82c, and a drive device 82e for driving the mesh belt 82d via the drive roller 82c.

Therefore, the works dropped on the cooling means 8 are collected on one end of the conveyor 82 by the hopper 81, transported to the outside of the cooling means 8 by the conveyor 82, and sent to the next finishing process.

On the other hand, after the work is dropped onto the cooling means 8 on the reversing machine 7, the reversing table 73 of the reversing machine 7 is returned to the horizontal position, and the empty car 1 is unloaded by the another manipulator 10 to a predetermined unloading condition. It is transported to the stage 9. The empty car 1 carried to the unload stage 9 is carried to the loading stage 2 by another carrying means 40 as needed.

As shown in FIG. 1, the load stage 3, the zinc pot 4 and the centrifuge 5 are arranged equidistant from the center of rotation of the first manipulator 10. Therefore, one operator operates the manipulator 10 to lower the arm 13 on the load stage 3 and hold the car 1 while keeping the distance from the center of rotation to the carrier 14 constant, and then the zinc pot 4 To the centrifuge 5 from the zinc kettle 4 can be carried out.

The centrifuge 5, the flux tank 6, the reversing device 7 and the unload stage 9 are arranged equidistant from the center of rotation of the other manipulator 10. Therefore, by operating the manipulator 10 by one operator, the cage 1 is grabbed by the centrifuge 5 and the flux tank 6 and the reversing machine 7 are sequentially conveyed while keeping the distance from the turning center to the carrier 14 constant. Moreover, the empty car 1 can be conveyed from the reversing machine 7 to the unload stage 9.

As for the other necessary workers, only one worker needs to put the work into the hopper 21 with a dryer or the hopper 22 with a vibrator. Since each process of hot dip galvanizing which has been processed by hanging can be processed, it is possible to significantly save labor.

In the manipulator 10, since the carrying device 14 is connected to the tip of the arm 13 which can be raised and lowered, the carrying device 14 supports the work or the container in which the work is placed and supports the arm 1.
By raising and lowering 3, the work or the container containing the work can be raised and lowered on the spot. Therefore, the interval between the load stage 3, the zinc pot 4, and the centrifuge 5 or the centrifuge 5, the flux tank 6 and the reversing device 7 can be shortened, and the factory site can be narrowed.

Further, in this embodiment, two manipulators 10 are used, and the movement loci A.
Since B is crossed over the centrifuge 5, the dipping process in molten zinc and the dipping process in flux can be processed in parallel, and the idle time of the equipment that processes each process can be reduced. By reducing the amount, the production efficiency can be improved.

In the above embodiment, two manipulators 10 are used, but the number of manipulators 10 may be 1 or more and 4 or less. If more than five manipulators 10 are used, the equipment cost will be high, and a large number of personnel will be required to operate each manipulator 10, so that the purpose of labor saving cannot be achieved.

Further, in the above description, the hot-dip galvanizing system used for hot-dip galvanizing of small items such as bolts and nuts has been explained, but the metal formed as the plating layer is not particularly limited to zinc, and aluminum or the like is used. Any metal can be applied to the molten metal plating, and the present invention can be applied to, for example, a molten metal plating system for irregularly shaped products.

[0049]

As described above, according to the present invention, one or four manipulators are provided in addition to the equipment for processing each step of hot-dip metal plating, and a work or a container containing the work is provided. It can be held in a carrier and transported.

Here, each of the one to four manipulators has a structure in which a carrier is connected to the tip of an arm that swings and moves up and down, as compared with the case where a hanger conveyor and a carrier having a lifting or retracting function are combined. In addition to the simple structure of the carrier, wiring to the carrier is not required, and the structure is simple and the cost is low.

Further, it is possible for one to four workers to carry the work or the container containing the work between the steps of the molten metal plating, which conventionally required six to seven workers. Great labor savings can be achieved.

Moreover, since each of the one to four manipulators has a carrier connected to the tip of an arm that swings and moves up and down, it can be moved up and down at a place where a work or a container containing the work is grasped or released. Therefore, an inclined section for raising and lowering like a hanger conveyor becomes unnecessary, the interval between the equipments for processing each step of the molten metal plating can be shortened, and the narrow factory site can be effectively used.

In the present invention, in particular, the loading stage for loading the work into the empty car, the transporting means for transporting the car loaded with the work from the loading stage to the load stage, and the car being tumbled before the cooling means. A reversing machine for dropping the work to the cooling means, an unload stage on which an empty car is placed, and a transfer means for transferring an empty car from the unload stage to the loading stage are provided, and the reversing machine and the unload stage are manipulators. It can be arranged below the movement locus of the carrier.

In this case, further, only by adding one worker for loading the work at the loading stage, each process from the loading of the work into the cage to the molten metal plating and the work is discharged by the reversing machine. Since the car can be returned to the loading stage, the labor can be saved in a wider range.

Further, when a hopper for accommodating the preprocessed work in the loading stage and dropping it into an empty car is provided, the work of loading the work into the car is simplified,
This is advantageous because the work load can be reduced.

In the present invention, in particular, two manipulators are provided, and the moving locus of the carrier of one manipulator is constituted so as to intersect with the moving locus of the carrier of another one manipulator in the centrifuge. You can

In this case, a dipping step in molten metal,
Since the process after the surplus metal shaking-off process can be performed in parallel, it is possible to shorten the idle period of the equipment that processes each process and improve the production efficiency.

[Brief description of drawings]

FIG. 1 is a plan view of an embodiment of the present invention.

FIG. 2 is a side view and a plan view of a manipulator used in the present invention.

FIG. 3 is a side view, a front view, and a plan view of a clamp of the present invention.

FIG. 4 is a front view and a side view of the reversing machine according to the present invention.

FIG. 5 is a side view of the conveyor of the cooling means of the present invention.

[Explanation of symbols]

 1 Basket 2 Loading Stage 3 Load Stage 4 Molten Metal (Zinc) Kettle 5 Centrifuge 6 Flux Tank 7 Inverter 8 Cooling Means 9 Unload Stage 10 Manipulator 11 Base 13 Arm 14 Carryer 21 Dryer Hopper 22 With Vibration Machine Hopper 30 Conveying means 40 Conveying means A Movement locus B Movement locus

Claims (5)

[Claims] 1. A load stage (3) on which a pretreated workpiece is placed, a molten metal pot (4) for containing molten metal,
Centrifuge to remove excess molten metal attached to work
(5), a flux tank (6), a cooling means (8) for cooling the surface-treated work in the flux tank (6), and a manipulator (10) for transferring the work, the manipulator (10) Is a base installed on the ground (11)
And an arm (1
3) and a carrier (14) supported at the tip of the arm (13), the load stage (3), molten metal pot (4), and centrifuge.
(5), the flux tank (6) and the cooling means (8) are arranged below the movement loci (A) and (B) of the carrier (14) of the manipulator (10), respectively. . 2. A loading stage (2) for loading a work into an empty car (1), and a loading stage from the loading stage (2).
Conveying means for conveying the car (1) with the work loaded in (3)
(30), the inverting stage (7) that inverts the car (1) in front of the cooling means (8) and drops the work into the cooling means (8), and the unload stage where the empty car (1) is placed. (9) and a transport means (40) for transporting the empty car (1) from the unload stage (9) to the loading stage (2), and the reversing machine (7) and the unload stage (9) Is a manipulator (10) carrier (14)
The hot-dip galvanizing system according to claim 1, wherein the hot-dip galvanizing system is arranged below the movement locus (B) of the. 3. A hopper (21) / (22) for accommodating a pre-processed work in a loading stage (2) and dropping it into an empty basket (1).
The hot dip metal plating system according to claim 2, wherein the hot metal plating system is provided. 4. Two manipulators (10) are provided,
The moving locus (A) of the carrier (14) of one manipulator (10) is the centrifuge (5) and the carrier of the other manipulator (10).
The hot dip metal plating system according to claim 1, 2 or 3, which is configured to intersect with the movement locus (B) of (14). 5. The molten metal plating system according to claim 1, wherein the carrier (14) has an ash scraper (17) supported thereon.