JPH0585845U - Ash scraping device for galvanizing tank - Google Patents

Abstract

(57) [Summary] [Purpose] Rubbing the ash and dross on the surface of the zinc bath across the length of the steel pipe between the claws of the hanging jig, that is, the entire width of the zinc bath. [Structure] Zinc of a steel pipe to be galvanized by holding both ends of the steel pipe 4 with the claws 6 of the steel pipe hanging jig 3 suspended on an overhead traveling crane and soaking the steel pipe 4 in the molten zinc bath 7 in an inclined state In the plating equipment, a moving element 13 that is movable in the longitudinal direction of the steel tube along the steel tube hanging jig 3 is provided.
3 is provided with a scraping plate 16. [Effect] Ashes can be prevented from adhering to the surface of plated steel pipes, and high-quality plated steel pipes without variations can be manufactured.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a zinc plating ash scraping device capable of preventing ash from adhering when a steel pipe is immersed in a zinc plating bath and pulled up.

[0002]

[Prior Art]

 In plating equipment for steel plates, steel pipes, etc., for removing ash, dross, etc. on the surface of the zinc bath where there is no equipment required for plating, install a device that moves the scraping plate on the surface of the zinc bath on the zinc bath mount. , Ash, dross, etc. are removed. The ash and dross on the surface of the zinc bath can be removed with a scraping plate by immersing the scraping plate 20 to 30 mm below the surface of the zinc bath and scraping the suspended matter to the ash that floats on the zinc bath surface and near the boundary of the bath surface. Impurities such as ash and dross existing in the can be effectively removed, which is an extremely effective means.

A scraping plate type removal device for ash, dross, etc. on the surface of the zinc bath where there is no equipment required for the above plating is attached to a moving body that reciprocates in parallel with the zinc bath surface and extends to the bottom of the bath surface. A scraping device including a suspended scraping plate, a guide roller arm and a bucket frame fixed at a fixed angle to a rotary shaft that is pivotally mounted on a rotary link that reciprocates in an arc shape. A guide roller pivotally mounted on the guide roller arm, an arc-shaped guide frame that abuts on the guide roller and guides the guide roller, and a bucket fall lever fixed to the rotating shaft at a fixed angle with the bucket frame. And a pumping and discharging device including a stopper that engages with the tipping lever and the above-mentioned bucket frame, and stretch a wire mesh or a slit-shaped notched plate. An apparatus including a bucket body (Japanese Patent Laid-Open No. 51-81742) has been proposed.

In addition, it is difficult to remove the ash and dross of the entire zinc bath at once in order to remove the ash and dross on the surface of the zinc bath where the equipment required for plating is present. For this reason, for steel pipe plating in which a steel pipe is lifted by a claw attached to a hanging jig and immersed in a zinc bath, a method of manually scraping the ash between devices to a certain place has been adopted. However, the work is performed under poor environmental conditions and is avoided by workers. As a device for removing the ashes and dross on the surface of the zinc bath where the equipment required for such plating exists, there are a jet nozzle that is installed at one end of the zinc bath and collects the floating dross at the other end, and a jet nozzle. There has been proposed a device (Japanese Patent Laid-Open No. 61-37956) having a dross scraping device for scraping the dross blown onto the surface and a dross scooping device for pumping the dross scraped up.

[0005]

[Problems to be solved by the device]

 The device disclosed in Japanese Patent Application Laid-Open No. 51-81742 is premised on that there is no obstacle on the surface of the zinc bath, and the steel pipe and the nail of the hanging jig are immersed in the zinc bath. In the device, the arm of the nail cannot be scratched to scratch the entire surface of the zinc bath. Also, 3 to 7 pipes for plating are immersed in the zinc bath at the same time depending on the size of the pipe, and the entire zinc bath is used. Therefore, between the nails of the hanging jig, that is, the zinc pipe. It cannot be applied to remove ash and dross on the zinc bath surface over the entire length of the steel pipe over the entire bath width.

Further, in the apparatus disclosed in Japanese Patent Laid-Open No. 61-37956, the floating material on the surface of the zinc bath, zinc oxide, etc. are actually formed into a film in a solidified state, and the film is blown toward each other so as to stick to each other. Is difficult, especially when applied to steel pipe plating equipment that is designed to use the entire zinc bath.

The object of the present invention is to scrape the ash and dross on the surface of the zinc bath across the length of the steel pipe across the claws of the hanging jig immersed in the zinc bath, that is, the entire bath width. An object of the present invention is to provide an ash scraping device for a tank.

[0008]

Means for Solving the Problems The inventors of the present invention have made extensive studies in order to achieve the above object. As a result, instead of the conventional method of installing the scraping plate on the galvanizing bath side, by installing the scraping plate drive system in the hanging jig of the galvanized steel pipe, the gap between the hooks of the hanging jig immersed in the zinc bath That is, the inventors came to the conclusion that the ash and dross on the surface of the zinc bath can be scratched over the entire width of the zinc bath over the length of the steel pipe, and reached the present invention.

That is, the present invention relates to a steel pipe for galvanizing by holding both ends of the steel pipe with the claws of a steel pipe hanging jig suspended in an overhead traveling crane and soaking the steel pipe in a molten zinc bath in an inclined state. In the galvanizing equipment, an assembling device for a galvanizing tank is provided in which a moving element that is movable in the longitudinal direction of the steel tube is provided along a steel tube suspension jig, and a scraping plate is arranged on the moving element.

[0010] Further, zinc-plating of a steel pipe is performed, in which both ends of the steel pipe are grasped by the claws of a steel pipe suspension jig suspended from an overhead traveling crane, and the steel pipe is dipped in a molten zinc bath in an inclined state for galvanization. In the equipment, a mover that can move in the longitudinal direction of the steel pipe along the steel pipe hanging jig is provided, and a scraping plate is arranged on the mover, and the scratching is performed in synchronization with the speed at which the zinc bath surface of the plated steel pipe floats. It is an ash scraping device for a galvanizing tank provided with a scraping plate control device for controlling the plate moving speed.

[0011]

[Action]

 In this invention, a moving element is provided which is movable in the longitudinal direction of the steel pipe along the steel pipe hanging jig, and the scraping plate is arranged on the moving element. The entire width of the zinc bath can be scratched with a scraping plate, and the ash floating on the surface of the zinc bath can be scraped. In addition, a moving element that can move in the longitudinal direction of the steel pipe along the steel pipe hanging jig is provided, and a scraping plate is arranged on the moving element, and the scratching is performed in synchronization with the speed at which the zinc bath surface of the plated steel pipe floats. Since the scraping plate control device for controlling the plate moving speed is provided, the scraping plate can be immersed 20 to 30 mm below the surface of the zinc bath and moved just before the steel pipe floats in synchronization with the floating speed of the steel pipe. It is possible to scrape the floating ash at the floating position immediately before floating, and it is possible to prevent the ash from adhering to the surface of the steel pipe and causing defects.

As a mover that is movable in the longitudinal direction of the steel pipe along the hanging jig in the present invention, a driving wheel and an idle wheel are arranged at both ends of the hanging jig in the longitudinal direction, and a chain or the like is hung to fix the hanging jig. Connect the drive motor and drive wheel installed in the tool via the power transmission mechanism, connect both ends of the chain hung on the drive wheel and idle wheel to the mover, start the drive motor and rotate the drive wheel. The moving element reciprocates in the longitudinal direction of the steel pipe along the rail fixed to the hanging jig, and the scraping plate arranged on the moving element also reciprocates in the same manner.

Usually, a steel pipe hanging jig is lifted and lowered by two hoisting devices provided in an overhead crane or the like, but the hoisting speed is changed, and the steel pipe is immersed in a zinc bath in an inclined state and floats. Is designed for. The inclination angle of this steel pipe changes with the passage of time. For this reason, the speed at which the steel pipe floats above the zinc bath surface changes momentarily after the steel pipe starts to float above the zinc bath surface. The scratching plate control device controls the speed of the ashes scraping plate, which slightly corresponds to the floating speed.

Regarding the moving distance of the scraping plate, the positions of the scraping start point and the scraping end point change depending on the length of the steel pipe to be plated. In order to cope with this change and also the change in the speed of the scraping plate, it is preferable to provide a position detector for detecting the traveling position of the scraping plate. In addition, the zinc bath surface height changes because the amount of zinc decreases at the beginning and near the end of galvanized steel pipe production. For this reason, the floating timing of the steel pipe from the surface of the zinc bath also changes, and the movement of the scraping plate must be started accordingly. Since it is necessary to detect the height of the zinc bath surface in order to keep the start of movement of the scraping plate constant, a grounding limit is provided on the hanging jig, and the start of moving the scraping plate is set by turning the grounding limit ON and OFF. I do.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of this invention will be described below with reference to FIGS. FIG. 1 is a front view of a steel pipe hanging jig provided with an ash scraping device of the present invention, FIG. 2 is an operation explanatory diagram until completion of dipping the steel pipe of the present invention in a galvanizing bath, and FIG. 3 is an ash scraping device of the present invention. FIG. 4 is a graph showing the operation of the shifting device, FIG. 4 is a graph showing the length of the steel pipe, the elapsed time from the start of winding, and the position of the intersection of the steel pipe on the surface of the zinc bath. FIG. FIG. 8 is an explanatory view of the shape of the scraping plate. In FIG. 1, 1 and 2 are arms of two hoisting devices of an overhead traveling crane (not shown), and 3 is a steel pipe suspension jig suspended from the arms 1 and 2, and both ends of the steel pipe 4 to be plated are supported by a support frame 5 It is gripped by the two claws 6, 6 provided on the plate, and is dipped in the molten zinc 8 in the molten zinc bath 7 in an inclined state for galvanizing.

Reference numeral 9 is a drive motor provided on the support frame 5, 10 is a drive wheel provided at one end of the support frame 5, 11 is an idle wheel provided on the opposite side, and is provided between the drive wheel 10 and the idle wheel 11. Is chained with a chain 12, and both ends of the chain 12 are connected to a mover 13. Further, a chain 14 for transmitting power is provided between the drive motor 9 and the drive wheel 10. When the drive motor 9 is rotated in the normal and reverse directions, the drive wheel 10 is rotated in the normal and reverse directions via the chain 14, The moving element 13 is configured to reciprocate between the idle wheel 11 and the driving wheel 10 via the guide rail 15 fixed to the support frame 5. Reference numeral 16 is a scraping plate pivotally attached to the lower end of an arm 17 hanging from the moving element 13 by a pivot 18, 19 is a position detector for the moving element 13 provided on the support frame 5, and 20 is a zinc bath 7 provided on the support frame 5. This is the earth limit for detecting the surface height of the molten zinc surface.

With the above construction, when galvanizing the steel pipe, the steel pipe 4 suspended from the claws 6 of the suspension jig 3 provided on the arms 1 and 2 of the overhead crane 21 is a zinc bath. When it reaches the upper position, the scraping plate 16 is positioned near the right claw 6 as shown in FIG. 2 (a) and is in a standby state. Then, the dipping of the steel pipe 4 into the molten zinc 8 in the zinc bath tank 7 is started in the state shown in FIG. 2 (b), and the dipping of the steel pipe 4 to be plated is completed in the state shown in FIG. 2 (c). Then, as shown in FIG. 2 (d), the arms 1 and 2 of the overhead crane 21 are operated to make the steel pipe 4 to be plated horizontal, and then it is temporarily stopped in the state shown in FIG. 3 (a). This stop time varies depending on the galvanizing standard. After stopping for a certain period of time, the arms 1 and 2 of the ceiling crane 21 are operated to start the floating of the steel pipe 4.

Immediately before the steel pipe 4 starts to float, the scraping plate control device (not shown) activates the timer to activate the drive motor 9 by turning off the earth limit 20, the mover 13 starts moving, and the scraping plate 16 is removed. Molten zinc 8 Move to the left while scraping the ash, dross, etc. on the surface and boundary surface. The steel pipe 4 floats up on the surface of the clean molten zinc bath immediately after the ash, the dust, etc. immediately after the scraping plate 16 is moved is removed. The steel pipe 4 is pulled up in an inclined state as shown in FIGS. 3 (b) to 3 (d). The hoisting jig 3 is hoisted by the two hoisting devices 22 and 23 of the overhead crane 21, but since the hoisting device 23 is hoisted at twice the speed of the hoisting device 22, the floating speed of the steel pipe 4 changes. A scraping plate control device (not shown) controls the moving speed of the scraping plate 16, that is, the moving element 13 in synchronization with the change in the floating speed of the steel pipe 4, and scrapes ash dross and the like. At the time when the ash scraping work is completed over the entire length of the steel pipe 4 and the steel pipe 4 is completely pulled up from the molten zinc 8, the scraping plate 16 is located near the left claw 6 as shown in FIG. 3 (d). After stopping and lowering the steel pipe 4 to a predetermined position, the steel pipe 4 is moved to the original standby position. The above-described series of steps is repeated for each cycle of plating of the steel pipe 4.

As shown in FIGS. 3B to 3D, as the steel pipe 4 is pulled up, the inclination angle of the steel pipe 4 increases, so that the speed at which the steel pipe 4 floats on the surface of the molten zinc bath changes. . As shown in FIG. 4, the scraping plate control device calculates the position of the intersection of the steel pipe 4 and the molten zinc bath surface from the rising speed of the hanging jig 3 and the height of the steel pipe 4, and the levitation corresponding to the speed. In order to run the scraping plate 16 immediately before the steel pipe 4 at a depth of 20 to 30 mm below the surface of the molten zinc bath, the position detector 19 detects the position of the scraping plate 16 to control the speed. When the immersion depth of the scraping plate 16 is shallow (for example, 10 mm or less), ash dross in the advancing direction of the scraping plate 16 passes through the lower end of the scraping plate 16 and floats backward. Further, if the speed of the scraping plate 16 becomes too fast when the depth is too deep, the surface of the molten zinc bath before and after the scraping plate 16 becomes more corrugated, and the ashes between the scraping plate 16 and the peripheral wall of the zinc bath 7 are rolled up to the rear of the scraping plate 16. The ash will flow out to.

Therefore, in the present invention, the speed of the scraping plate 16 is controlled, and the scraping plate 16 is rotatably suspended by the pivot 18 on the arm 17 as shown in FIG. 5 (a). And mount it so that it has an inclination in the direction opposite to the traveling direction. The inclination of the scraping plate 16 is as shown in FIG. 5 (b) at low speed and as shown in FIG. 5 (c) at high speed. If it is configured so as not to tilt, it is possible to cope with a slight change in the speed of the scraping plate 16, and the scraping state becomes the best state.

In the above embodiment, the moving element 13 was driven by the combination of the drive motor and the chain. However, as long as the moving element 13 can reciprocate, ball screws, cylinders, etc. It is also possible to apply a class, winch or rack and pinion system. The number and structure of the scraping plates are not limited, and the number and structure may be changed as necessary. Further, as the material of the scraping plate, stainless steel type, pure iron type, ceramics, wood, etc. are conceivable. Utilizing the characteristics of each, it is possible to use it according to the application. Further, the moving speed of the scraping plate can be set to a speed pattern in which the ash is drawn up at a constant speed by adjusting the zinc bath immersion depth of the scraping plate by the scraping plate lifting device. Furthermore, if necessary, a pattern for scratching the floating start side of the plated steel pipe of about 500 mm twice may be added. As for the shape and size of the scraping plate, various shapes are possible as shown in FIGS. In the steel pipe hanging jig, the ash removal effect can be further improved on both the front end side and the rear end side of the steel pipe by changing the claw shape and the like or widening the distance between the claws of the hanging jig. If there is no obstacle on the deck side of the molten zinc bath when the steel pipe suspension jig is raised, it is effective to install an ash remover for the entire molten zinc bath and use it together.

[0022]

[Effect of the device]

 As described above, according to the present invention, the ash-free clean bath surface can be provided immediately before the galvanized steel pipe floats from the molten zinc bath surface, so that the ash can be prevented from adhering to the galvanized steel pipe surface. It is possible to manufacture high quality and consistent plated steel pipes.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a suspension jig dedicated to a steel pipe provided with an ash scraping device of the present invention.

FIG. 2 is an explanatory view of a situation until completion of dipping of a steel pipe in a galvanized steel pipe manufacturing process, in which (a) is a state before dipping in a molten zinc bath,
(B) is a state in the middle of dipping in a molten zinc bath, (c) is a state in which dipping is completed in a molten zinc bath, and (d) is a state in which a plated steel pipe is horizontal.

FIG. 3 is a diagram for explaining the operation of the ash scraping device of the present invention, where (a) is the state before the start of movement, (b) is the state at the start of floating the coated steel pipe, and (c) is the state during the floating of the coated steel pipe. And (d) shows the situation when the lifting of the plated steel pipe is completed.

FIG. 4 is a graph showing the length of a steel pipe, the elapsed time from the start of winding, and the position of the intersection of the steel pipe on the surface of the zinc bath.

FIG. 5 is an explanatory view of a mounting state and an operating state of the scraping plate,
Figure (a) shows the mounted state, (b) shows the state at low speed,
Figure (c) shows the state at high speed.

6A to 6E are side surface shape explanatory views of a scraping plate.

7A to 7E are side surface shape explanatory views of the float type scraping plate.

FIG. 8A to FIG. 8F are explanatory views of the planar shape of the scraping plate.

[Explanation of symbols]

 1,2,17 arm 3 suspension jig 4 steel pipe 5 support frame 6 claw 7 galvanizing bath 8 molten zinc 9 drive motor 10 drive wheel 11 idle wheel 12,14 chain 13 mover 16 scraping plate 18 pivot 19 position detector 20 Earth limit 21 Overhead crane 22,23 Hoisting device

Claims (2)

[Scope of utility model registration request] 1. A galvanizing facility for galvanizing a steel pipe, in which both ends of the steel pipe are gripped by the nails of a jig for suspending a steel pipe suspended on an overhead traveling crane or the like, and the steel pipe is dipped in a molten zinc bath in an inclined state for galvanization. In the ash scraping device for a galvanizing tank, a moving element that is movable in the longitudinal direction of the steel tube is provided along the steel tube hanging jig, and a scraping plate is arranged on the moving element. 2. A galvanizing facility for galvanizing a steel pipe, wherein both ends of the steel pipe are gripped by the claws of a steel pipe hanging jig suspended in an overhead traveling crane or the like, and the steel pipe is dipped in a molten zinc bath in an inclined state for galvanization. In the above, a moving element that is movable in the longitudinal direction of the steel pipe along the steel pipe hanging jig is provided, and a scraping plate is arranged on the moving part, and the scraping plate moves in synchronization with the speed at which the zinc bath surface of the plated steel pipe floats. An ash scraping device for a galvanizing tank provided with a scraping plate control device for controlling the speed.