JPH06122951A - Continuous galvanizing device for steel tube - Google Patents

Abstract

PURPOSE:To improve plating efficiency by continuously dipping many steel tubes in a molten zinc bath with a first hanger unit and picking up the steel tubes through second and third hanger units. CONSTITUTION:At least the left and right couples of the first, second and third hanger units 1-3 and pickup 4 are provided above a molten zinc bath 5. Comb. shaped suspension supports 8, 20 and 29 are plurally of singly held by the hanger units 1-3 and made rotatable, vertically movable and horizontally movable. Many steel tubes are introduced by a magnet receiver 49 and a delivery mechanism 50, held horizontally by the support 8 of the first hanger unit 1, vertically arranged in regular fashions, lowered and dipped in the bath 5. The steel tubes are delivered between the plural supports 8, 20 in the bath in cooperation with the first and second hanger units 1 and 2, and then transferred to the support 29 of the third hanger unit 3. The galvanized steel tube is pulled up in this way by the pickup 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous hot dip galvanizing apparatus for steel pipes.

[0002]

2. Description of the Related Art A conventional hot-dip galvanizing apparatus for steel pipes, as shown in FIG. 9, has a hot-dip galvanized bath a, a radial holding member b rotatably installed in the bath a, and is vertically movable. It was equipped with a pickup d.

Then, one to three steel pipes c are held in the section e of the holding member b and immersed in the molten zinc f in the bath a, and the plated steel pipe c is lifted by the pickup d. Was there.

[0004]

Therefore, there is a problem that the plating efficiency is very poor and the production quantity is small.

Therefore, according to the present invention, the plating treatment efficiency is high,
It is an object of the present invention to provide a continuous hot-dip galvanizing apparatus capable of increasing the production quantity.

[0006]

In order to achieve the above-mentioned object, the present invention provides a comb-shaped first suspension column which is provided with a molten zinc bath and is capable of holding a large number of steel pipes at predetermined vertical mutual intervals. Each of the steel pipes is provided between a first hanger unit that is arranged in a plurality of rows in the front and rear and is capable of moving the first suspension column vertically and horizontally in the front and rear direction, and the first suspension column that is lowered into the molten zinc bath. A second hanger unit is provided in which a plurality of comb-shaped second suspension columns that can be exchanged with each other are arranged in the front and rear rows, and the second suspension columns can be moved up and down, and the first suspension column at the front end of the first hanger unit is held. A third hanger unit which is provided with a comb-shaped third suspension column capable of receiving one row of the formed steel pipes at predetermined vertical mutual intervals, and is capable of moving the third suspension column forward and backward horizontally, and a third hanger unit of the third hanger unit. For 3 suspended columns A pickup frying pull from within the molten zinc bath at a predetermined mutual distance a lifting steel tube receiving the steel pipe, but having respectively at least a left-right pair.

[0007]

A large number of steel pipes are continuously immersed in the molten zinc bath in the first hanger unit, and the steel pipe to be plated is continuously picked up via the second hanger unit and the third hanger unit. The efficiency of the plating process is improved because it can be lifted up.

Moreover, since a large number of steel pipes can be dipped and lifted at predetermined mutual intervals by the first, second and third suspension columns and pickups, a plated steel pipe of good quality can be obtained.

[0009]

The present invention will be described in detail below with reference to the drawings showing the embodiments.

FIGS. 1, 2 and 3 show an example of a continuous hot-dip galvanizing apparatus for steel pipes according to the present invention. FIG. 1 is a side view thereof, FIG. 2 is a partially omitted plan view, and FIG. The front views of the parts are respectively shown.

This plating apparatus is provided with a first hanger unit 1, a second hanger unit 2, a third hanger unit 3 and a pickup 4, at least one pair each on the left and right. Reference numeral 5 denotes a molten zinc bath, and the steel pipes 7 ... Are plated with the molten zinc 6 in the bath 5.

In the first hanger unit 1, however, a comb-shaped first suspension column 8 capable of holding a large number of steel pipes 7 at predetermined vertical intervals and a plurality of first suspension columns 8 arranged in front and rear rows. The holding beam 9 and a driving machine 10 such as a cylinder for moving the holding beam 9 up and down.

The first suspension column 8 has a long rotating shaft portion 11 arranged on a holding beam 9 at equal intervals in the front-rear direction, and a plurality of short round bar-shaped support members 12 protruding horizontally. It consists of and.

The bearings 12 ... Are arranged at equal intervals in the axial direction of the rotary shaft portion 11, and the steel pipes 7 are hooked on the bearings 12. The lower end of the rotating shaft portion 11 and the tip end of the supporting body 12 are each formed in a conical shape.

The rotating shaft portion 11 is vertically attached to the holding beam 9 so as to be rotatable about its axis and immovable vertically.

Of the first suspension columns 8 ..., the rotating shaft portions 11 of the first suspension columns 8d at the front end and the first suspension columns 8a at the rear end.
Reference numeral 11 is longer than the rotating shaft portions 11, 11 of the other first suspension columns 8b, 8c, and the upper ends thereof are respectively support plates.
It is rotatably inserted into 13 and the guide body 14.

The rotating shafts 11, 11 of the first suspension columns 8a, 8d are driven by driving machines 15, 16 such as cylinders fixed to the support plate 13 at a predetermined angle, for example 90.
° ─── Configured to be rotatable.

The rotating shaft portion 11 of the first suspension column 8d is a link.
By means of 17, the first suspension columns 8b, 8c are rotatably connected to the rotary shaft portions 11, 11.

The bearings 12 ... of the first suspension columns 8 are set so that their tips are directed rearward and sideways, and the bearings 12 ... of the first suspension columns 8b, 8c, 8d are Are also set to have substantially the same orientation.

Receiving body 12 of the first suspension column 8b, 8c, 8d
The length of…, when the support body 12… is turned to the rear,
It is set so as to come into contact with or come close to the rear-side rotating shaft portion 11.

Further, the length of the support members 12 of the first suspension column 8a is such that when the support members 12 are turned rearward, they come into contact with or come close to the vertical presser bar 18. Is set.

The presser bar 18 is attached to the rear end portion of the holding beam 9 so as to be swingable around the axis A, and when the holding beam 9 is raised, a driving machine 19 such as a cylinder fixed to the support plate 13 is provided.
When the holding beam 9 is lowered, the holding beam 9 is held vertically while being separated from the driving machine 19.

Alternatively, when the holding beam 9 is raised, the presser bar 18 can be moved up and down while maintaining the vertical shape, and the supporters 12 ... Of the first suspension column 8a can be brought close to or brought into contact with each other. (Not shown).

The holding beam 9 and the support plate 13 are
A driving mechanism (not shown) is configured to be horizontally movable in the front-rear direction.

The second hanger unit 2 is arranged side by side in the vicinity of the inside of the first hanger unit 1, and the first suspension column 8, the holding beam 9 and the drive unit 1 of the first hanger unit 1 are arranged.
0, 16, the link 17, and the support plate 13 have substantially the same configuration (there are one less than the first suspension column 8), the second suspension columns 20 at equal intervals in the front and rear, the holding beams 21, the drivers 23, 22, the links 24, and The support plate 25 is provided.

The rotating shafts 26 of the second suspension columns 20 are rotated by a predetermined angle around the shaft center via the link 24 by the driving of the drive unit 22 to receive and support the second suspension columns 20. Body 27 ...
The tip is set to face backward and sideways.

Of the second suspension columns 20 ..., the second suspension columns 20a
A pressing column 28 for preventing the falling of the steel pipe is erected next to the rear of the second suspension column 20. When the support body 27 of the second suspension column 20 is directed rearward, the support column 27 of the second suspension column 20a is installed. Second on the presser post 28
The support members 27 of the suspension columns 20b and 20c are the rotation shaft portions 26 adjacent to the rear.
26, abutting or approaching, respectively.

The second hanger unit 2 is immovable in the front-rear horizontal direction, and the drive beam 23 drives the holding beam 21, the holding column 28, and the second suspension column 20 to move up and down.

The third hanger unit 3 is arranged near the outer side of the first hanger unit 1 and is substantially the same as the first suspension column 8, the holding beam 9, the drivers 10, 16 and the support plate 13 of the first hanger unit 1. (1) 3rd suspension column with the same structure 2
9, a holding beam 30, a driving machine 32, 31 and a support plate 33, a holding pillar 34 similar to the holding pillar 28 of the second hanger unit 2,
Is equipped with.

The holding beam 30 of the third hanger unit 3,
The third suspension column 29, the support plate 33, and the like are configured to be horizontally movable in the front-rear direction by a drive mechanism (not shown), and the holding beam 30, the pressing column 34, and the third suspension column 29 are vertically moved by the drive of the driving machine 32. .

The rotating shaft portion 35 of the third suspension column 29 is connected to the driving machine 31.
Is rotated about a shaft center by a predetermined angle, and the tip ends of the bearing members 36 of the third suspension column 29 are set so as to face rearward and sideward. When directed, it comes into contact with or comes close to the pressing column 34.

Next, the pickup 4 is disposed outside the third hanger unit 3 and has a comb-shaped holder 37 and a holder.
A rail member 38 in which 37 is swingably attached around the axis B,
A support member 39 having the upper end of the rail member 38 fixed thereto, and a support member
A driving machine 40 such as a cylinder for vertically moving the holding body 37 via the rail 39 and the rail member 38, a driving machine 41 such as a cylinder swingably attached to the support member 39, the holding body 37 and the driving machine 41.
And a connecting member 42 for connecting.

The rail member 38 is provided with a guide roller 43.
It is held vertically by being movable up and down.

The connecting member 42 is swingably attached to the base end of the holding body 37, and the holding body 37 is driven from the vertical direction around the axis B through the connecting member 42 by the drive of the driving machine 41. It is configured to be swingable in a horizontal range.

The holding body 37 includes a holding plate portion 44 whose base end is bent obliquely, and a plurality of short round bar-shaped support bodies 45 projecting perpendicularly to the longitudinal direction of the holding plate portion 44. It consists of ...

The receiving members 45 are arranged at equal intervals in the longitudinal direction of the holding plate portion 44, and are the holding plate portions 44, which are adjacent to each other.
V-shaped recesses 46 are formed in the portions corresponding to the portions 5 and 45, respectively. (It should be noted that the recess 46 may be removed to make it straight.)

Between the pickup 4 and the first hanger unit 1 and above the molten zinc bath 5, there is an axis C.
A plurality of magnet rolls 47 that rotate around are provided.

The magnet roll 47 has a plurality of V-shaped concave grooves 48 formed on its surface at equal intervals.
Then, the steel pipe 7 can be adsorbed and conveyed.

On the other hand, behind the first hanger unit 1, a magnet receiving table 49 and a delivery mechanism 50 are provided, and the steel pipes 7 ... Ejecting from the drying table 58 can be delivered to the first hanger unit 1. The delivery mechanism 50 is arranged inside the first hanger unit 1.

The magnet pedestal 49 has a steel pipe 7 on its upper surface 51.
The structure is such that ... Can be adsorbed at equal intervals. Further, the magnet pedestal 49 is swingably attached to the pivot portion 52, and is configured to be swingable around the axis D by the drive of a driving machine 53 such as a cylinder.

The delivery mechanism 50 includes a pedestal 54 having a comb-like oscillating portion 59 that can oscillate about the axis E, and a cylinder or the like for oscillating the oscillating portion 59 in a range from vertical to horizontal. Machine 55 and cradle
And a driving machine 56 such as a cylinder for horizontally moving 54.

The oscillating portion 59 has a plurality of short round rod-shaped receiving members 57 ...
Are arranged at equal intervals in the longitudinal direction of the rocking portion 59, and are set to be the same as the suction interval of the steel pipes 7 ...

Further, the receiving members 57 of the delivery mechanism 50, the receiving members 12 of the first hanger unit 1, the second hanger unit 2.
Support body 27 of the third hanger unit 3, support body 36 of the third hanger unit 3 ...
The intervals between the support members 45 of the pickup 4 and the concave grooves 48 of the magnet roll 47 are set to be the same.

Now, the operation procedure of the continuous hot-dip galvanizing apparatus configured as described above will be described.

5 to 7 used for explaining the procedure are simplified diagrams of the first, second and third hanger units 1, 2, 3 and the pickup 4 when viewed from below, and are not shown by solid lines. The state of being immersed in the molten zinc 6 in the molten zinc bath 5 is shown, and the drawing by the phantom line shows the state of being retracted above the molten zinc bath 5. Moreover, it is assumed that the plating apparatus is currently in operation.

First, as shown in FIG. 1, a predetermined number of steel pipes 7 ...
─ One by one, it is moved to the magnet cradle 49.

Then, the steel pipes 7 ... (Hereinafter referred to as 7a ...) Are adsorbed on the upper surface 51 in a state of being separated from each other by a predetermined front-rear distance-hereinafter, this is called a horizontal alignment state.

At this time, the swinging portion 59 of the pedestal 54 is held horizontally and stands by below the magnet pedestal 49.

Next, the magnet pedestal 49 is moved around the shaft center D by 90.
° It falls and becomes horizontal, and the steel pipes 7a move from the upper surface 51 of the magnet pedestal 49 to the gap between the supporting members 57 of the swinging part 59 and are placed in a horizontal alignment state. It

After that, as shown in FIG. 4, the swinging portion 59 swings around the axis E to change from the horizontal shape to the vertical shape.
are held by the support members 57 in a state in which a ... Are separated from each other at a predetermined vertical interval, which is hereinafter referred to as a vertically aligned state.

Further, as the cradle 54 moves forward, the first hanger unit 1 retracts, and both stop at the steel pipe transfer position on the molten zinc bath 5 to receive the support 57 of the cradle 54.
Then, the supporting members 12 ... Of the first suspension columns 8a of the first hanger unit 1 are adjacent to each other.

At this time, the supporting members 12 of the first suspension columns 8a ...
Is directed rearward, the first suspension columns 8 are located above the molten zinc bath 5, and the receiving members 12 ...
... correspond one-on-one at the same height, and the presser bar 18 is in a horizontally escaped state. Therefore, both receivers 12 ..., 57 ...
Further, the steel pipes 7a ... Are simultaneously held.

Next, after the presser bar 18 swings and becomes vertical (see FIG. 1), the pedestal 54 retracts to its original position, and the swinging portion is moved.
59 swings from vertical to horizontal.

As a result, the supporting body 12 of the first suspension column 8a is
The steel pipes 7a are held in the vertical alignment state only on the
When the 54 is retracted, the presser bar 18 prevents the steel pipes 7a ...

After that, as shown in FIGS. 5- (A) and 5- (B), the presser bar 18 and the first suspension columns 8a, 8b, 8c, 8d.
Drops and is immersed in the molten zinc 6 in the molten zinc bath 5 (see FIG. 1).

At this time, as shown in FIG. 5- (A), the holding column 28 of the second hanger unit 2 and the second suspension columns 20a, 20
b, 20c are in the molten zinc bath 5, and steel pipes 7b ..., 7c ..., 7d ... are held in vertical alignment on the support members 27.

Further, as shown in FIG. 5- (B), the supporting members 12 ... Of the first suspension columns 8b, 8c, 8d face laterally and do not interfere with the steel pipes 7b ..., 7c ..., 7d. Are running away.

The first suspension columns 8b and 8c pass through the steel pipes 7b ..., 7c ..., 7d ...
a, 8b, 8c and 8d are located right next to the presser column 28 and the second suspension column 20a, 20b and 20c, respectively. Also, the receiver 12
The support and the support 27 correspond to each other at the same height.

Next, as shown in FIG. 5- (C), the supporters 12 ... of the first suspension columns 8b, 8c, 8d swing rearward so that the steel pipes 7b ..., 7c ..., 7d. , Held in vertical alignment.

Thereafter, the supporting members 27 ... Of the second suspension columns 20a, 20b, 20c swing sideways, and the steel pipes 7b ..., 7c.
It comes off from d ... and escapes so as not to interfere with the steel pipes 7b ..., 7c ..., 7d.

Next, the holding column of the second hanger unit 2
When the 28 and the second suspension columns 20a, 20b, 20c are lifted and retracted, and the state shown in FIG. 6- (A) is reached, as shown in FIG. 6- (B), the holding bar 18 of the first hanger unit 1 is pressed. After the first suspension columns 8a, 8b, 8c, 8d have moved forward by the distance between the front and rear (for one row), the holding column 28 and the second suspension column 28 of the second hanger unit 2 as shown in FIG. 6- (C). Prop 20a, 20b, 20
c, the pressing column 34 and the third suspension column 29 of the third hanger unit 3 descend.

At this time, the pressing column 34 and the third suspension column 29 are
Located right next to the first suspension columns 8c and 8d, the second suspension columns
20a, 20b, 20c are located right next to the first suspension column 8a, 8b, 8c.

Further, the supporting bodies 12 of the first suspension columns 8a, 8b, 8c and the supporting bodies 27 of the second suspension columns 20a, 20b, 20c.
... correspond one-to-one at the same height, and the support members 12 of the first suspension column 8d and the support members 27 of the third suspension column 29 correspond to each other at the same height.

Next, as shown in FIG. 7- (A), the supporting members 27 ... Of the second suspension columns 20a, 20b, 20c swing rearward so that the steel pipes 7a ..., 7b ..., 7c. , Are respectively held in the vertical alignment state, the support members 36 of the third suspension column 29 swing backward, and the steel pipes 7d are held in the vertical alignment state.

After that, the first suspension columns 8a, 8b, 8c,
8d oscillates to the side, and the steel pipes 7a ..., 7b ..., 7c ...,
It escapes from 7d ...

Next, the holding bar of the first hanger unit 1
18 and the first suspension columns 8a, 8b, 8c, 8d rise,
As shown in FIG. 7- (B), the holding column 34 and the third suspension column 29 of the third hanger unit 3 are advanced to hold the pickup 4 holding body.
Stop right next to 37. At this time, the support 45 of the holder 37 ...
And the receiving members 36 ... Of the third suspension column 29 correspond to each other at the same height.

Therefore, the steel pipes 7d held by the bearings 36 of the third suspension column 29 are also held in the vertically aligned state by the bearings 45 of the pickup 4.

Then, as shown in FIG. 7- (C), after the supporting members 36 of the third suspension column 29 swing sideward and escape, the pressing column 34 of the third hanger unit 3 and the 3 Suspended column 29 rises and retracts to the position shown in Fig. 5- (A).

The steel pipes 7a ... 7d are plated while being immersed in the molten zinc 6 as described above and sequentially fed forward.

Next, as shown in FIG. 8, the holder 37 swings about the axis B to change from vertical to horizontal. As a result, the steel pipes 7d held by the receiving members 45 are placed in the recesses 46 in a horizontally aligned state.

After that, the holder 37 moves up, the plated steel pipes 7d ... Are lifted up from the molten zinc 6 in the molten zinc bath 5, and the magnet roll 47 rotating above the bath 5.
The steel pipes 7d are adsorbed on the ... And sent obliquely upward. When there are two pickups 4 as shown in FIG. 2, the one near the magnet roll 47 may be raised and the other may be lowered to tilt the steel pipes 7d.

Further, the holding body 37 descends to the original position, swings in the opposite direction to the above and shifts from the horizontal state to the vertical state and stands by.

On the other hand, as shown in FIG. 4, the first hanger unit 1 in the state shown in FIG. 7- (B) retracts from the pedestal 54 to receive the next steel pipe 7.

By repeating the above operation procedure, it is possible to continuously plate a large number of steel pipes 7.

The present invention is not limited to the above-mentioned embodiment, and the design can be freely changed without departing from the gist of the present invention, and the first, second and third hanger units 1, 2, 3 and the pickup 4 can be changed. It is also free to provide one or more pairs. Also,
Number of first and second suspension stanchions 8, 20, each pedestal 12, 27, 3
The number of 6,57 can be increased or decreased freely.

[0076]

Since the invention is constructed as described above,
The following significant effects are achieved.

A large number of steel pipes 7 ... Are placed in the molten zinc bath 5.
Since it can be continuously dipped and pulled up, the plating process is efficient and the production quantity is greatly increased.

Since the steel pipes 7 ... Are pulled up from the molten zinc in a state of being separated from each other by a predetermined mutual interval, each steel pipe 7 can be easily subjected to inner and outer surface finishing such as wiping and blowing after plating. A plated steel pipe in good condition can be obtained.

It is possible to easily obtain a plated steel pipe having a large zinc deposition amount without changing the production quantity. Further, the present invention is particularly small in diameter (about 20 mm to 42 mm) and long (4 to 8 m).
It is suitable for the steel pipe 7 ...

[Brief description of drawings]

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

FIG. 2 is a plan view.

FIG. 3 is a front view of a main part.

FIG. 4 is an explanatory diagram of an operating procedure.

FIG. 5 is an explanatory diagram of an operating procedure.

FIG. 6 is an explanatory diagram of an operating procedure.

FIG. 7 is an explanatory diagram of an operating procedure.

FIG. 8 is an explanatory diagram of an operating procedure.

FIG. 9 is a simplified diagram showing a conventional example.

[Explanation of symbols]

 1 1st hanger unit 2 2nd hanger unit 3 3rd hanger unit 4 Pickup 5 Molten zinc bath 7 Steel pipe 8 1st suspension strut 20 2nd suspension strut 29 3rd suspension strut

Claims (1)

[Claims] 1. A comb-shaped first device comprising a molten zinc bath 5 and capable of holding a large number of steel pipes 7 at predetermined vertical intervals.
A first hanger unit 1 in which a plurality of suspension columns 8 are arranged in the front and rear and the first suspension columns 8 can be moved vertically and horizontally in the front and rear direction, and the first suspension columns lowered into a molten zinc bath 5. The second hanger unit 2 in which a plurality of second comb-like suspension columns 20 capable of mutually exchanging the steel pipes 7 with each other are arranged in front and rear rows and the second suspension columns 20 are vertically movable. And a steel pipe 7 held by the first suspension column 8 at the front end of the first hanger unit 1 ... A third comb-shaped suspension column 29 capable of receiving one row at a predetermined vertical mutual interval and the third suspension column 3rd which can move 29 forward and backward horizontally
A hanger unit 3 and a pickup 4 for receiving the steel pipes 7 held by the third suspension columns 29 of the third hanger unit 3 and lifting the steel pipes 7 at a predetermined mutual interval from the molten zinc bath 5. A continuous hot-dip galvanizing apparatus for steel pipes, which is provided with at least one pair on each side.