CN105543751B - A kind of batch quantity hot dipping zinc is with scraping apparatus for ash - Google Patents

Abstract

The invention discloses a dust-scraping device for batch hot-dip galvanizing, which belongs to the technical field of hot-dip galvanizing. The device includes an electric trolley, an electric push rod, a reduction motor and a rotating shaft. One end of the electric push rod is fixed on the electric trolley, and the other end is connected with the reduction motor, and the contraction of the electric push rod drives the reduction motor up and down. The output shaft of the geared motor is connected with the rotating shaft, and a scraper and an infrared detector are fixed on the rotating shaft. The board width of the scraper is 5-10 cm larger than half of the zinc pot width. The ash scraping device of the present invention is used in pairs during the ash removal operation, and is respectively distributed on the guide rails on both sides of the zinc pot in the length direction. The invention has the advantage of realizing the mechanized operation of dusting on the surface of the zinc bath in the batch hot-dip galvanizing process, replacing the traditional manual dusting.

Description

A dust scraping device for batch hot-dip galvanizing

technical field

The invention relates to a dust-scraping device for batch hot-dip galvanizing, which belongs to the technical field of hot-dip galvanizing.

Background technique

During hot-dip galvanizing in batches, the zinc pot is an open system, the zinc bath is in direct contact with the atmosphere, the metal zinc reacts with the oxygen in the atmosphere to form zinc oxide and floats on the surface of the zinc solution; when the workpiece is dipped, the zinc chloride on the surface of the workpiece The scum produced by the thermal decomposition of the ammonium-assisted plating salt film also floats on the surface of the zinc bath, which is the main source of zinc dust in the production process of hot-dip galvanizing. During hot-dip galvanizing in batches, the dipping of the workpiece is intermittent. Before dipping, the zinc ash on the surface of the zinc bath is manually scraped to the end of the zinc pot with a dust rake, and the mirror surface of the zinc liquid is exposed in the zinc pot. The hanger is lowered, and the workpiece is immersed in the zinc bath until it is submerged. After the workpiece is dipped in the zinc bath for a certain period of time, the zinc ash on the surface of the zinc bath under the hanger and above the immersed workpiece is picked up to the end of the zinc pot with a dust rake. , the hanger rises, and the workpiece moves out of the zinc bath and enters the next process. The two dusting operations before and after immersion plating have a direct impact on the quality of the coating. If the dusting is not thorough, zinc dust will be attached to the surface of the zinc bath, resulting in quality defects such as missed plating, zinc tumors, zinc thorns, interlayers, and poor adhesion. Therefore, the dusting operation is an important process of the batch hot-dip galvanizing process.

In production practice, traditional manual ash removal has three significant disadvantages: ① It is difficult to stably control the depth of the zinc rake into the zinc bath, the speed of ash removal is uneven, there are many zinc particles in the zinc ash, and the ash production is high. There is a lot of waste of zinc; ② many people are occupied, and the work efficiency is low; ③ workers are in close contact with zinc baths, which affects their physical and mental health. In response to these problems, scientific and technological workers have carried out relevant technical reforms, but no substantial progress has been made in practical applications. Chinese patent (patent number: ZL90200624.X) and Chinese patent (notification number: CN 102494544 A) respectively disclose a scraper slag removal machine, and Chinese patent (patent number: ZL 200510042376.X) discloses a ladle float The slag removal method, the liquid level environment applied by these patented technologies and the operation process of the front and rear processes are far from the batch hot-dip galvanizing process, and there is little significance for mutual reference. Chinese patent (patent number: ZL 201020223710.8) discloses a device for cleaning impurities on the surface of the galvanized liquid surface, which consists of two sets of heat preservation devices and impurity scrapers. The plate is fixed on the heat preservation device and can rotate around a pin shaft to 1 cm below the zinc liquid surface. When the heat preservation device moves along the guide rails on both sides of the zinc pot under the drive of the hoist, the scraper scrapes the zinc ash to the end of the zinc pot In the receiving tank of the lower part; with this patented technology, the zinc ash on the surface of the zinc bath can be cleaned before the workpiece is dipped, but the hanger is still above the zinc pot when the workpiece enters the zinc bath after dipping, so that the hanger The connecting steel wire or steel cable between the workpiece and the workpiece hinders the movement of the scraper; and with the continuous increase of zinc consumption, the zinc bath liquid level in the zinc pot continues to drop, and it is necessary to replenish zinc ingots in the zinc bath or adjust the scraper in time High position, which is impossible to do in actual production.

However, due to the complexity of the size and shape of the workpiece to be galvanized, the limited operating space, and the discontinuity of the batch hot-dip galvanizing process, manual dusting has been used for 300 years since the invention of hot-dip galvanizing. For this reason, it will be an urgent problem to be solved by technicians in the field of batch hot-dip galvanizing to study a mechanized or even automatic ash scraping device to replace the current manual ash removal operation method, improve the operating environment, and reduce the amount of ash removal.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies in the prior art, to provide a batch of hot-dip galvanizing dust-scraping device, used for batch hot-dip galvanizing process before dipping and dipping ash operation, improve the coating quality, Improve the operating environment.

The dust scraping device for batch hot-dip galvanizing of the present invention comprises an electric trolley 1, an electric push rod 2, a reduction motor 3, a rotating shaft 4, a scraper 5 and an infrared detector 6, and the lower end of the electric push rod 2 is fixed on the electric trolley 1 Above, the reduction motor 3 is fixed on the upper end of the electric push rod 2; the output shaft of the reduction motor 3 is connected with the rotating shaft 4, and a scraper 5 and an infrared detector 6 are installed under the rotating shaft 4.

Preferably, the probe 61 of the infrared detector 6 of the present invention and the plate surface 51 of the scraper 5 are on the same plane;

The width of the plate surface 51 of the scraper 5 of the present invention is greater than 1/2 of the width of the zinc pot.

Preferably, the width of the board surface 51 of the scraper 5 in the present invention is 5-10 cm larger than half of the width of the zinc pot.

During dusting operation of the dust scraping device of the present invention, the distance from the probe 61 of the infrared detector 6 to the surface of the zinc bath is 1-2 mm smaller than the distance from the probe 61 to the bottom edge of the scraper 5 surface 51 .

The dust-scraping devices of the present invention are used in pairs when working, and are respectively distributed on the guide rails on both sides of the zinc pot in the length direction.

The expansion and contraction of the electric push rod 2 of the present invention drives the reduction motor 3 and the rotating shaft 4 up and down, and finally drives the lifting of the scraper 5 above the zinc pot.

The rotation of the output shaft of the reduction motor 3 in the present invention drives the rotation of the rotation shaft 4, and drives the rotation of the scraper 5 and the infrared detector 6 fixed on the rotation shaft 4.

When the soot scraping device for batch hot-dip galvanizing of the present invention is working, the supporting hot-dip galvanizing hanger required to include at least two parts, the bottom frame and the crossbeam, and two or more steel cables are connected between the crossbeam and the bottom frame. Connected, the plated parts are all hung on the hooks under the bottom frame; the bottom frame of the hanger is immersed in the zinc bath during dipping, the beam of the hanger is hung above the zinc pot, and the connecting steel cable between the beam and the bottom frame is in a straight line Run through the surface of the zinc bath along the length.

Before dipping, the electric trolley starts and walks along the guide rail. When the electric trolley walks into one end of the zinc pot, the electric trolley brakes, the deceleration motor starts, and the rotating shaft, the scraper and the infrared detector fixed on the rotating shaft rotate; when the scraper When the plate surface and the infrared detector probe are perpendicular to the surface of the zinc bath, the deceleration motor stops, the electric push rod shrinks, and the scraper is driven down to a set distance. At this time, the lower end of the scraper plate is immersed in the zinc bath to a depth of 1-2 mm (as shown in the figure 3.1→3.2 of 3), the electric trolley starts and walks along the guide rail to the other end of the zinc pot; when the electric trolley reaches the other end of the zinc pot (3.2→3.3 in Figure 3), the scraper will scrape the zinc on the surface of the zinc bath The ash is scraped from one end of the zinc pot to the other; after that, the electric trolley brakes, the electric push rod is extended, and the scraper is driven up to the set distance, and the deceleration motor is started. When the surface of the scraper is parallel to the surface of the zinc bath, The deceleration motor stops, the electric trolley starts, and continues to walk along the guide rail, driving the scraper to leave the top of the zinc pot to the waiting position at the outer end of the zinc pot (3.3→3.4→3.5 in Figure 3); at this time, the surface of the zinc bath in the zinc pot is larger than One-half of the area completes the dusting operation. The soot scraping device of the present invention located on the guide rail on the other side of the zinc pot also starts to work to complete the ash removal operation on the remaining area of the zinc bath surface in the zinc pot (3.5→3.6→3.7→3.8→3.9 in Figure 3). So far, the dusting operation before immersion plating is completed, the zinc ash on the surface of the zinc bath is cleaned to the end of the zinc pot, the surface of the zinc bath is exposed to the mirror surface, and the workpiece to be plated is moved to the top of the zinc bath and lowered to start immersion plating. After the immersion time is up, the hanger moves along the width direction of the zinc pot, leaning towards the side of the zinc pot, and the surface of the zinc bath exposes more than half of the liquid surface area, and the electric trolley enters the zinc pot from the waiting position along the guide rail on one side of the zinc pot and move to the other end of the zinc pot, the scraper completes the dusting operation (4.1 → 4.2 → 4.3 → 4.4 → 4.5 in Figure 4); then, the hanger moves in the opposite direction along the width of the zinc pot, biased to the other side of the zinc pot , the surface of the zinc bath exposes more than half of the liquid surface area again, and the dust scraping device on this side starts to work again, completing the dusting of the remaining area of the zinc bath surface in the zinc pot and moving to the waiting position outside the zinc pot (Fig. 4 4.5 → 4.6 → 4.7 → 4.8 → 4.9); at this time, the ash removal operation in the immersion plating process is completed, the zinc ash on the surface of the zinc bath is cleaned to one end of the zinc pot, the surface of the zinc bath is exposed to the mirror surface, and the hangers and workpieces are removed from the zinc The pot enters the next process, and the ash scraping device returns to the waiting state of not scraping the ash before the immersion plating (3.1 in Figure 3).

Beneficial effects of the present invention

(1) It can realize the mechanized operation of dusting in the whole process of hot-dip galvanizing, replacing the traditional manual dusting.

The ash scraping device of the present invention can realize the cleaning of zinc ash on the surface of the zinc bath in the zinc pot that is larger than half of the area through the movement of the electric trolley, the expansion and contraction of the electric push rod and the rotation of the scraper. Dust-scraping devices are used in pairs when working, and the mechanized cleaning of zinc ash can be realized for the fully open zinc bath surface in the zinc pot before dipping; for the incompletely open zinc bath surface in the zinc pot during dipping, because the present invention The plate width of the dust scraping device is designed to be 5-10 cm larger than 1/2 of the zinc pot width, so with the hanger of appropriate structure, the dust scraping device of the present invention can also realize the zinc dust on the surface of the zinc bath in dipping. clean up. The movement and position control of the whole process of ash removal by the ash scraping device of the present invention are all mechanized, which can completely replace the traditional manual rake ash removal.

(2) The immersion depth of the dust-scraping device in the dusting process can be automatically positioned according to the rise and fall of the zinc bath liquid level in the zinc pot, so as to realize the precision and continuity of the dusting process.

During the production of hot-dip galvanizing, with the continuous increase of the galvanized batches, the zinc consumption in the zinc pot continues to increase, resulting in a gradual decline in the liquid level in the zinc pot. When the zinc bath liquid level drops to a certain level, the zinc pot The heat capacity of the zinc bath is not enough to support the continuation of immersion plating. At this time, zinc ingots need to be added to the zinc pot. Zinc ingots are not replenished in time after each immersion, but replenished in stages when the zinc bath in the zinc pot decreases to a certain level, that is, the zinc bath level in the zinc pot decreases continuously for a period of time. Infrared detectors are installed on the scraping device of the present invention, and the measuring distance from the detector probe to the surface of the zinc bath is 1 to 2 mm larger than the distance from the detector probe to the lowermost edge of the scraper plate surface, so that it can be ensured that the zinc When the bath liquid level fluctuates, the distance between the scraper surface and the zinc bath is always controlled at 1 to 2 mm, which avoids the empty travel of the scraper when it is working and the scraper is immersed in the zinc bath too deeply, which may cause zinc in the zinc pot Agitation of the bath. It is beneficial to realize the precision and continuity of the ashing process.

Description of drawings

Fig. 1 is a schematic structural view of the dust-scraping device of the present invention.

Fig. 2 is a schematic diagram of the symmetrical positions of the dust scraping devices of the present invention when they are used in pairs.

Fig. 3 is a schematic diagram of the action and position of the dust-scraping device of the present invention when it is cleaning dust before immersion-plating.

Fig. 4 is a schematic diagram of the action and position of the dust-scraping device of the present invention when it is working in immersion-plating.

In the figure: 1-electric trolley; 2-electric push rod; 3-reduction motor; 4-rotating shaft; 5-scraper; 6-infrared detector; 7-guide rail.

Detailed ways:

The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited to the content described.

Example 1

The dust scraping device for batch hot-dip galvanizing described in this embodiment includes an electric trolley 1, an electric push rod 2, a reduction motor 3, a rotating shaft 4, a scraper 5 and an infrared detector 6, and the lower end of the electric push rod 2 is fixed on the electric trolley 1, the deceleration motor 3 is fixed on the upper end of the electric push rod 2; the output shaft of the deceleration motor 3 is connected with the rotating shaft 4, and the scraper 5 and the infrared detector 6 are installed under the rotating shaft 4; the probe 61 of the infrared detector 6 and the scraper The board face 51 of plate 5 is on a plane; The board face width of scraper 5 is 5 centimeters larger than half of the zinc pot width. The distance from the probe of the infrared detector 6 to the surface of the zinc bath is 2 mm smaller than the distance from the probe of the infrared detector 6 to the lowermost edge of the scraper 5 during the ashing operation. The ash scrapers of the present embodiment are used in pairs as shown in Figure 2 during work, and are respectively distributed on the guide rails on both sides along the length direction of the zinc pot.

Before dipping, the electric trolley 1 starts and walks along the guide rail. When the electric trolley 1 walks into one end of the zinc pot, the electric trolley 1 brakes, the reduction motor 3 starts, the rotating shaft 4 and the scraper 5 fixed on the rotating shaft 4 and infrared detection The device 6 rotates; when the surface of the scraper 5 and the probe of the infrared detector 6 are perpendicular to the liquid surface of the zinc bath, the reduction motor 3 stops, and the electric push rod 2 shrinks, driving the scraper 5 to drop a set distance, at this time the scraper 5 The lower end of the surface is immersed in the zinc bath to a depth of 2 mm, and the electric trolley 1 starts and walks along the guide rail to the other end of the zinc pot; when the electric trolley 1 reaches the other end of the zinc pot, the scraper 5 will remove the zinc ash from the zinc pot scrape one end to the other. After that, the electric trolley 1 brakes, the electric push rod 2 extends, drives the scraper 5 to rise to the set distance, and the reduction motor 3 starts. When the surface of the scraper 5 is parallel to the surface of the zinc bath, the reduction motor 3 stops, and the motor The trolley 1 starts and continues to walk along the guide rail, driving the scraper 5 to leave the top of the zinc pot to the waiting position at the outer end of the zinc pot; at this time, the area of the zinc bath surface in the zinc pot is greater than 1/2 to complete the dusting operation. The same ash-scraping device of the present invention that is positioned on the zinc pot along the guide rail on the other side starts to work, and finishes the ash-beating operation of the remaining area of the zinc bath surface in the zinc pot. So far, the dusting operation before immersion plating is completed, the zinc ash on the surface of the zinc bath is cleaned to one end of the zinc pot, the surface of the zinc bath is exposed to the mirror surface, and the workpiece to be plated is moved to the top of the zinc bath and lowered to start immersion plating. After the dipping time is up, the hanger moves along the width direction of the zinc pot, and is biased towards the side of the zinc pot. The surface of the zinc bath exposes more than half of the liquid surface area. inside the pot and move to the other end of the zinc pot, and the scraper 5 completes the ash removal operation; then, the hanger moves in the opposite direction along the width of the zinc pot to the other side of the zinc pot, and more than half of the liquid is exposed on the surface of the zinc bath again. surface area, the scraping device on this side starts to work again, completes the dusting of the remaining surface area of the zinc bath in the zinc pot and moves to the waiting position outside the zinc pot; at this time, the dusting operation of the dipping process is completed, and the zinc on the surface of the zinc bath The ash is cleaned to one end of the zinc pot, the surface of the zinc bath is exposed to the mirror surface, the hanger and the workpiece are moved out of the zinc pot, and enter the next process, and the ash scraping device returns to the waiting state before the ash was scraped before the immersion plating.

Example 2

The dust scraping device for batch hot-dip galvanizing described in this embodiment includes an electric trolley 1, an electric push rod 2, a reduction motor 3, a rotating shaft 4, a scraper 5 and an infrared detector 6, and the lower end of the electric push rod 2 is fixed on the electric trolley 1, the deceleration motor 3 is fixed on the upper end of the electric push rod 2; the output shaft of the deceleration motor 3 is connected with the rotating shaft 4, and the scraper 5 and the infrared detector 6 are installed under the rotating shaft 4; the probe 61 of the infrared detector 6 and the scraper The plate surface 51 of the plate 5 is on a plane; the plate surface width of the scraper 5 is 10 centimeters larger than half of the zinc pot width. The distance from the probe of the infrared detector 6 to the surface of the zinc bath is 1 mm smaller than the distance from the probe of the infrared detector 6 to the bottom edge of the scraper 5 during the dusting operation. The ash scrapers of the present embodiment are used in pairs as shown in Figure 2 during work, and are respectively distributed on the guide rails on both sides along the length direction of the zinc pot.

Before dipping, the electric trolley 1 starts and walks along the guide rail. When the electric trolley 1 walks into one end of the zinc pot, the electric trolley 1 brakes, the reduction motor 3 starts, the rotating shaft 4 and the scraper 5 fixed on the rotating shaft 4 and infrared detection The device 6 rotates; when the surface of the scraper 5 and the probe of the infrared detector 6 are perpendicular to the liquid surface of the zinc bath, the reduction motor 3 stops, and the electric push rod 2 shrinks, driving the scraper 5 to drop a set distance, at this time the scraper 5 The lower end of the surface is immersed in the zinc bath to a depth of 1mm, and the electric trolley 1 starts and walks along the guide rail to the other end of the zinc pot; when the electric trolley 1 reaches the other end of the zinc pot, the scraper 5 will remove the zinc ash from the zinc pot scrape one end to the other. After that, the electric trolley 1 brakes, the electric push rod 2 extends, drives the scraper 5 to rise to the set distance, and the reduction motor 3 starts. When the surface of the scraper 5 is parallel to the surface of the zinc bath, the reduction motor 3 stops, and the motor The trolley 1 starts and continues to walk along the guide rail, driving the scraper 5 to leave the top of the zinc pot to the waiting position at the outer end of the zinc pot; at this time, the area of the zinc bath surface in the zinc pot is greater than 1/2 to complete the dusting operation. The same ash-scraping device of the present invention that is positioned on the zinc pot along the guide rail on the other side starts to work, and finishes the ash-beating operation of the remaining area of the zinc bath surface in the zinc pot. So far, the dusting operation before immersion plating is completed, the zinc ash on the surface of the zinc bath is cleaned to one end of the zinc pot, the surface of the zinc bath is exposed to the mirror surface, and the workpiece to be plated is moved to the top of the zinc bath and lowered to start immersion plating. After the dipping time is up, the hanger moves along the width direction of the zinc pot, and is biased towards the side of the zinc pot. The surface of the zinc bath exposes more than half of the liquid surface area. inside the pot and move to the other end of the zinc pot, and the scraper 5 completes the ash removal operation; then, the hanger moves in the opposite direction along the width of the zinc pot to the other side of the zinc pot, and more than half of the liquid is exposed on the surface of the zinc bath again. surface area, the scraping device on this side starts to work again, completes the dusting of the remaining surface area of the zinc bath in the zinc pot and moves to the waiting position outside the zinc pot; at this time, the dusting operation of the dipping process is completed, and the zinc on the surface of the zinc bath The ashes are cleaned to one end of the zinc pot, the surface of the zinc bath is exposed to the mirror surface, and the hangers and workpieces are moved out of the zinc pot to enter the next process. The dust scraping device returns to the start waiting state of not scraping dust before the immersion plating.

Example 3

The dust scraping device for batch hot-dip galvanizing described in this embodiment includes an electric trolley 1, an electric push rod 2, a reduction motor 3, a rotating shaft 4, a scraper 5 and an infrared detector 6, and the lower end of the electric push rod 2 is fixed on the electric trolley 1, the deceleration motor 3 is fixed on the upper end of the electric push rod 2; the output shaft of the deceleration motor 3 is connected with the rotating shaft 4, and the scraper 5 and the infrared detector 6 are installed under the rotating shaft 4; the probe 61 of the infrared detector 6 and the scraper The board face 51 of plate 5 is on a plane; The board face width of scraper 5 is 8 centimeters larger than half of the zinc pot width. The distance from the probe of the infrared detector 6 to the surface of the zinc bath is 1.5 mm smaller than the distance from the probe of the infrared detector 6 to the bottom edge of the scraper 5 during the dusting operation; The shown ones are used in pairs, respectively distributed on the guide rails on both sides along the length direction of the zinc pot.

Before dipping, the electric trolley 1 starts and walks along the guide rail. When the electric trolley 1 walks into one end of the zinc pot, the electric trolley 1 brakes, the reduction motor 3 starts, the rotating shaft 4 and the scraper 5 fixed on the rotating shaft 4 and infrared detection The device 6 rotates; when the surface of the scraper 5 and the probe of the infrared detector 6 are perpendicular to the liquid surface of the zinc bath, the reduction motor 3 stops, and the electric push rod 2 shrinks, driving the scraper 5 to drop a set distance, at this time the scraper 5 The lower end of the surface is immersed in the zinc bath to a depth of 1.5 mm, and the electric trolley 1 starts and walks along the guide rail to the other end of the zinc pot; when the electric trolley 1 reaches the other end of the zinc pot, the scraper 5 will remove the zinc ash from the zinc Scrape one end of the pan to the other. After that, the electric trolley 1 brakes, the electric push rod 2 extends, drives the scraper 5 to rise to the set distance, and the deceleration motor 3 rotates. When the surface of the scraper 5 is parallel to the surface of the zinc bath, the deceleration motor 3 stops rotating. The electric trolley 1 starts and continues to walk along the guide rail, driving the scraper 5 to leave the zinc pot to the outer end waiting position; at this time, the area of the zinc bath surface in the zinc pot is greater than 1/2 to complete the dusting operation. The same ash-scraping device of the present invention that is positioned on the zinc pot along the guide rail on the other side starts to work, and finishes the ash-beating operation of the remaining area of the zinc bath surface in the zinc pot. So far, the dusting operation before immersion plating is completed, the zinc ash on the surface of the zinc bath is cleaned to one end of the zinc pot, the surface of the zinc bath is exposed to the mirror surface, and the workpiece to be plated is moved to the top of the zinc bath and lowered to start immersion plating. After the dipping time is up, the hanger moves along the width direction of the zinc pot, and is biased towards the side of the zinc pot. The surface of the zinc bath exposes more than half of the liquid surface area. inside the pot and move to the other end of the zinc pot, and the scraper 5 completes the ash removal operation; then, the hanger moves in the opposite direction along the width of the zinc pot to the other side of the zinc pot, and more than half of the liquid is exposed on the surface of the zinc bath again. surface area, the scraping device on this side starts to work again, completes the dusting of the remaining surface area of the zinc bath in the zinc pot and moves to the waiting position outside the zinc pot; at this time, the dusting operation of the dipping process is completed, and the zinc on the surface of the zinc bath The ashes are cleaned to one end of the zinc pot, the surface of the zinc bath is exposed to the mirror surface, and the hangers and workpieces are moved out of the zinc pot to enter the next process. The dust scraping device returns to the start waiting state of not scraping dust before the immersion plating.

Claims (3)

1. A dust-scraping device for batch hot-dip galvanizing, characterized in that it includes an electric trolley (1), an electric push rod (2), a geared motor (3), a rotating shaft (4), a scraper (5) and an infrared The detector (6), the lower end of the electric push rod (2) is fixed on the electric trolley (1), the deceleration motor (3) is fixed on the upper end of the electric push rod (2); the output shaft of the deceleration motor (3) and the rotating shaft ( 4) Connection, the scraper (5) and the infrared detector (6) are installed under the rotating shaft (4); the probe (61) of the infrared detector (6) and the board surface (51) of the scraper (5) On a plane; the width of the plate surface (51) of the scraper (5) is greater than half of the width of the zinc pot. 2. The dust-scraping device for batch hot-dip galvanizing according to claim 1, characterized in that: the width of the plate surface (51) of the scraper (5) is larger than half of the width of the zinc pot by 5 ~10cm. 3. The dust-scraping device for batch hot-dip galvanizing according to claim 1, characterized in that, during the dusting operation, the distance from the probe (61) of the infrared detector (6) to the surface of the zinc bath is less than that of the probe (61) The distance to the lowermost edge of the scraper (5) plate surface (51) is 1-2 mm smaller.