CN105525245A - Ash scraping device for hot-dip galvanizing before dip plating - Google Patents

Abstract

The invention discloses a dust scraping device used before hot-dip galvanizing and belongs to the technical field of mechanized operation for batch hot-dip galvanizing. The device of the present invention comprises an electric trolley, an electric push rod, a geared motor, a rotating shaft, and a bearing support. There are guide rails on both sides of the zinc pot, and the guide rails are respectively equipped with electric trolley Ⅰ and electric trolley Ⅱ, and the electric trolley Ⅰ and electric trolley Ⅱ are respectively connected with the lower ends of electric push rod Ⅰ and electric push rod Ⅱ; the reduction motor is fixed on the electric push rod The upper end of the rod Ⅰ, the output shaft of the deceleration motor is connected with one end of the rotating shaft, the other end of the rotating shaft is fixed on the bearing support, and the bearing support is fixed on the telescopic rod of the electric push rod II; a scraper and infrared detection are arranged under the rotating shaft device. The ash scraping device for hot-dip galvanizing of the present invention is used in pairs during the ash removal operation, and is respectively distributed at both ends of the zinc pot in the length direction. The dust-scraping device for hot-dip galvanizing of the present invention completes the mechanized dusting of the surface of the zinc bath before hot-dip galvanizing and galvanizing in batches, replaces traditional manual dusting, and improves the operating environment.

Description

A dust scraping device for hot-dip galvanizing before dipping

technical field

The invention relates to a dust scraping device used before hot-dip galvanizing and belongs to the technical field of mechanized operation for batch hot-dip galvanizing.

Background technique

During the batch hot-dip galvanizing process, the liquid zinc in the zinc pot reacts with the oxygen in the air to form zinc oxide that floats on the surface of the zinc pot. When the workpiece is dipped, the scum produced by the thermal decomposition of the helper salt film on the surface of the workpiece also floats on the surface of the zinc bath, which is the main source of zinc dust in the hot-dip galvanizing process. Before the hot-dip galvanizing process, the zinc ash on the surface of the zinc bath is manually scraped to the end of the zinc pot with an ash rake, the mirror surface of the zinc liquid is exposed in the zinc pot, the hanger above the zinc pot is lowered, and the workpiece is immersed in the zinc pot until it is submerged ; If the dusting is not thorough, there will be zinc dust floating on the surface of the zinc pot, which will easily cause quality defects such as missed plating, zinc thorns, interlayers, etc., so the dusting operation is an important process of the batch hot-dip galvanizing process. Traditional manual ash removal has the following disadvantages: ①The depth of the zinc rake into the zinc bath cannot be stably controlled, the speed of ash removal is uneven, more zinc particles are wrapped in the zinc ash, the ash production is high, and the zinc waste is large; ②Workers come into close contact Zinc pots, zinc ash and dust affect physical and mental health. In response to these problems, hot-dip galvanizing workers have carried out some technical reforms, but no substantial progress has been made in practice. For example, Chinese patent (patent number: ZL90200624.X) and Chinese patent (notification number: CN102494544A) respectively disclose a scraper slag removal machine, and Chinese patent (patent number: ZL200510042376.X) discloses a ladle scum removal machine. Methods, these patented technologies are all used to remove slag on the surface of molten steel, and the applied liquid surface environment and the operation process of the front and rear processes are far from the batch hot-dip galvanizing process, so there is little significance for mutual reference. Chinese patent (patent number: ZL201020223710.8) discloses a device for cleaning impurities on the galvanized liquid surface, which consists of two sets of heat preservation devices and impurity scrapers. 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 into the impurity receiving tank at the end of the zinc pot. Before dipping, the zinc ash on the surface of the zinc bath in the zinc pot can be cleaned; but this technology does not consider that the zinc liquid level in the zinc pot will drop with the increase of zinc consumption, so if the patent disclosure continues to work, it needs to be cleaned. It is impossible in actual production to ensure that the height of the zinc liquid level in the zinc pot remains unchanged or to readjust the position of the scraper every time the ash is hit. For this reason, researching a mechanized or even automated dusting device to replace the current manual dusting operation, improve the operating environment, and reduce zinc consumption will be an urgent problem to be solved by technicians in the field of batch hot-dip galvanizing.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, to provide a dust scraping device for hot-dip galvanizing before dipping, which is used for the ash removal operation of the batch hot-dip galvanization process, to replace the traditional manual ash removal, and to achieve The mechanization of ash operation improves the operating environment.

The dust scraping device before hot-dip galvanizing and galvanizing according to the present invention includes an electric trolley I1, an electric push rod I2, a reduction motor 3, a rotating shaft 4, a scraper 5, an infrared detector 6, a bearing support 7, an electric trolley II8, There are guide rails 10 on both sides of the electric push rod Ⅱ9 and the zinc pot 11, and the guide rails 10 are respectively equipped with electric trolley Ⅰ1 and electric trolley Ⅱ8, and the lower ends of the electric push rod Ⅰ2 and electric push rod Ⅱ9 are connected to the electric trolley Ⅰ1 and electric trolley Ⅱ8 respectively. Connection; the deceleration motor 3 is fixed on the upper end of the electric push rod Ⅰ2, the output shaft of the deceleration motor 3 is connected with the rotating shaft 4, the other end of the rotating shaft 4 is fixed on the bearing support 7, and the bearing support 7 is fixed on the telescopic extension of the electric push rod II9. On the rod; the bottom of the rotating shaft 4 is provided with a scraper 5 and an infrared detector 6 .

The direction of the probe 61 of the infrared detector 6 in the present invention is consistent with the direction of the plate surface 51 of the scraper 5 .

The width of the plate surface 51 of the scraper 5 of the present invention is smaller than the width of the zinc pot.

The width of the plate surface 51 of the scraper 5 according to the present invention is 5-10 cm smaller than the width of the zinc pot.

During dusting operation, 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 of the infrared detector 6 to the lowermost edge of the scraper 5 plate surface 51 .

The electric trolley I1 and the electric trolley II8 in the present invention move along the guide rails pre-laid on both sides of the zinc pot in the length direction.

The output shaft of the reduction motor 3 of the present invention can drive the rotating shaft 4 to rotate, and drive the scraper 5 and the infrared detector 6 fixed on the rotating shaft 4 to rotate.

The expansion and contraction of the electric push rod of the present invention can drive the reduction motor 3 and the bearing support 7 to lift, and finally drive the rotating shaft 4 and the scraper 5 to lift above the zinc pot.

When using the ash scraping device before hot-dip galvanizing and dipping according to the present invention: during hot-dip galvanizing production, guide rails are laid on both sides of the zinc pot, and the ash scraping device A and B stay at the two ends of the zinc pot and wait position; before immersion plating, the electric trolley Ⅰ and electric trolley Ⅱ start at the same time, and the two dust scraping devices move towards each other along the guide rails at different speeds (as shown in Figure 3, I), and the faster dust scraping device first Through the center line of the length of the zinc pot, as shown in Figure 3, the ash scraping device B in II, the electric trolley I and the electric trolley II of the ash scraping device B stop moving at the same time, the deceleration motor starts, and the rotation of the rotating shaft drives the scraper and detection connected to it. The device rotates at the same time. When the scraper plate surface and the infrared detector probe rotate to be perpendicular to the zinc bath liquid surface, the deceleration motor stops, and the electric push rod Ⅰ and electric push rod Ⅱ shrink at the same time, driving the scraper down the set distance. At this time The lower end of the plate surface of dust-scraping device B is immersed in the zinc bath to a depth of 1-2 mm (Ⅱ→Ⅲ in Figure 3), and then the electric trolley Ⅰ and electric trolley Ⅱ of dust-scraping device B start at the same time and return to one end of the zinc pot along the guide rail; When another dust-scraping device A passes through the center line of the length of the zinc pot (IV in Figure 3), the electric trolley Ⅰ and electric trolley Ⅱ of the dust-scraping device A stop moving at the same time, the deceleration motor starts, and the rotation of the rotating shaft drives the scraper connected to it. The plate and the detector rotate at the same time. When the scraper plate surface and the infrared detector probe rotate to be perpendicular to the zinc bath liquid surface, the deceleration motor stops, and the electric push rod Ⅰ and electric push rod Ⅱ shrink at the same time, driving the scraper down the set distance At this time, the lower end of the plate surface of the ash scraping device A is immersed in the zinc bath to a depth of 1-2mm (Ⅴ in Figure 3), and then the electric trolley I and the electric trolley II of the ash scraping device A start simultaneously and return to one end of the zinc pot along the guide rail . When the two dust scraping devices return to the end of the zinc pot, the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device brake at the same time, and the electric push rod Ⅰ and electric push rod Ⅱ extend at the same time, driving the scraper to rise to the set position. At a fixed distance, the deceleration motor starts. When the surface of the scraper plate is parallel to the surface of the zinc bath, the deceleration motor stops, and the electric trolley Ⅰ and electric trolley Ⅱ start at the same time and continue to walk along the guide rail, driving the ash scraping device to leave the zinc pot to the zinc bath. At the waiting position at the outer end of the pot, the two ash scraping devices are in the state before the ash removal work (Ⅵ→VII→I in Fig. 3); at this point, the ash removal operation is completed, and the workpiece to be plated is moved to the top of the zinc bath, and then descended and immersed in the zinc bath. The bath starts dipping.

The present invention is used for the cleaning of zinc ash on the zinc bath surface before batch hot-dip galvanizing, and its advantage compared with prior art is:

(1) It can realize the mechanized operation of dusting on the surface of the zinc bath before dipping, instead of the traditional manual dusting: the scraper for hot-dip galvanizing can be moved on the surface of the zinc bath through the movement of the electric trolley and the expansion and contraction of the electric push rod. Walk freely at a constant speed, and then scrape the zinc ash to one end of the zinc pot; the two scraping boards for hot-dip galvanizing of the present invention can work independently to complete the ash removal operation, without the assistance of manual ash removal, and can completely replace Manual dusting can completely realize the mechanized operation of dusting before immersion plating.

(2) Uniform dusting speed, high productivity, and small fluctuations on the surface of the zinc bath: the surface of the zinc bath is a completely open system before dipping, when the hot-dip galvanizing of the present invention uses two scraping devices to work simultaneously before dipping, it can The uniform speed control scrapes the zinc ash from the middle of the zinc pot to the two ends of the zinc pot. Compared with the full stroke of a single scraper (along the length of the zinc pot) or manual ash removal, the time required for ash removal is significantly shortened, significantly Improve the efficiency of dusting. The zinc ash scraper of the present invention is easy to realize walking at a constant speed on the guide rail, and the infrared detector on the zinc ash scraper is automatically adjusted according to the change of the distance from the probe to the surface of the zinc bath and controls the dipping depth of the scraper to be constant, which is easy to realize The scraper beats ash at a constant depth on the surface of the zinc bath, which avoids the arbitrariness of the immersion depth of the ash rake during traditional manual ashing, reduces the fluctuation of the zinc bath liquid level, and is beneficial to reduce the concentration of zinc particles in the zinc ash. Inclusion.

Description of drawings

Fig. 1 is the front view of the structure diagram of the present invention.

Fig. 2 is a left side view of a partial (A-A) structural schematic diagram of the present invention.

Fig. 3 is a schematic diagram of action and position when adopting the main content of the present invention for dust removal work.

In the figure: 1-electric trolley Ⅰ; 2-electric push rod Ⅰ; 3-reduction motor; 4-rotating shaft; 5-scraper; 51-scraper surface; 6-infrared detector; 61-infrared detector probe; 7-bearing support; 8-electric trolley Ⅱ; 9-electric push rod Ⅱ, 10-track; 11-zinc pot.

detailed description

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

Example 1

The dust scraping device before hot-dip galvanizing and galvanizing described in this embodiment includes an electric trolley I1, an electric push rod I2, a reduction motor 3, a rotating shaft 4, a scraper 5, an infrared detector 6, a bearing support 7, and an electric trolley II8 , electric push rod Ⅱ9, guide rails 10 are provided on both sides of the zinc pot 11, electric trolley Ⅰ1 and electric trolley Ⅱ8 are respectively arranged on the guide rail 10, electric trolley Ⅰ1 and electric trolley Ⅱ8 are respectively connected with electric push rod Ⅰ2 and electric push rod Ⅱ9 The lower end is connected; the deceleration motor 3 is fixed on the upper end of the electric push rod I2, the output shaft of the deceleration motor 3 is connected with the rotating shaft 4, and the other end of the rotating shaft 4 is fixed on the bearing support 7, and the bearing support 7 is fixed on the electric push rod II9. On the telescopic rod; below the rotating shaft 4, there is a scraper 5 and an infrared detector 6; the direction of the probe 61 of the infrared detector 6 is consistent with the direction of the plate surface 51 of the scraper 5; the width of the plate surface 51 of the scraper 5 is smaller than the width of the zinc pot 5 cm, the distance from the probe 61 of the infrared detector 6 to the surface of the zinc bath is 1mm less than the distance from the probe of the infrared detector 6 to the lowermost edge of the 61 scraper plate surface 51.

During hot-dip galvanizing production, guide rails are laid on both sides of the zinc pot, and the dust scraping device A and dust scraping device B stay at the two ends of the zinc pot in a waiting position; before dipping, the electric trolley Ⅰ and electric trolley Ⅱ start at the same time, The dust-scraping devices run towards each other along the guide rails at different speeds (as shown in Figure 3, Ⅰ), and the faster-speed dust-scraping device first passes through the center line of the length of the zinc pot, as shown in Figure 3, the dust-scraping device B in II , the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device B stop moving at the same time, the deceleration motor starts, the rotation of the rotating shaft drives the scraper and the detector connected to it to rotate at the same time, when the scraper surface and the infrared detector probe rotate to be perpendicular to When the liquid level of the zinc bath is reached, the deceleration motor stops, the electric push rod Ⅰ and the electric push rod Ⅱ shrink at the same time, and the scraper is driven down to a set distance. →Ⅲ), then the dust scraping device B electric trolley Ⅰ and electric trolley Ⅱ start simultaneously and return to one end of the zinc pot along the guide rail; when another dust scraping device A passes the midline of the zinc pot length (Ⅳ ), the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device A stop moving at the same time, the deceleration motor starts, the rotation of the rotating shaft drives the scraper and the detector connected to it to rotate at the same time, when the scraper surface and the infrared detector probe rotate to vertical When the surface of the zinc bath liquid is reached, the deceleration motor stops, and the electric push rod Ⅰ and electric push rod Ⅱ contract simultaneously, driving the scraper down to a set distance. At this time, the lower end of the scraping device A is immersed in the zinc bath to a depth of 1 mm (Fig. 3 Ⅴ) After that, the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device A start at the same time and return to one end of the zinc pot along the guide rail. When the two dust scraping devices return to the end of the zinc pot, the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device brake at the same time, and the electric push rod Ⅰ and electric push rod Ⅱ extend at the same time, driving the scraper to rise to the set position. At a fixed distance, the deceleration motor starts. When the surface of the scraper plate is parallel to the surface of the zinc bath, the deceleration motor stops, and the electric trolley Ⅰ and electric trolley Ⅱ start at the same time and continue to walk along the guide rail, driving the ash scraping device to leave the zinc pot to the zinc bath. At the waiting position at the outer end of the pot, the two ash scraping devices are in the state before the ash removal work (Ⅵ→VII→I in Fig. 3); at this point, the ash removal operation is completed, and the workpiece to be plated is moved to the top of the zinc bath, and then descended and immersed in the zinc bath. The bath starts dipping.

Example 2

The dust scraping device before hot-dip galvanizing and galvanizing described in this embodiment includes an electric trolley I1, an electric push rod I2, a reduction motor 3, a rotating shaft 4, a scraper 5, an infrared detector 6, a bearing support 7, and an electric trolley II8 , electric push rod Ⅱ9, guide rails 10 are provided on both sides of the zinc pot 11, electric trolley Ⅰ1 and electric trolley Ⅱ8 are respectively arranged on the guide rail 10, electric trolley Ⅰ1 and electric trolley Ⅱ8 are respectively connected with electric push rod Ⅰ2 and electric push rod Ⅱ9 The lower end is connected; the deceleration motor 3 is fixed on the upper end of the electric push rod I2, the output shaft of the deceleration motor 3 is connected with the rotating shaft 4, and the other end of the rotating shaft 4 is fixed on the bearing support 7, and the bearing support 7 is fixed on the electric push rod II9. On the telescopic rod; below the rotating shaft 4, there is a scraper 5 and an infrared detector 6; the direction of the probe 61 of the infrared detector 6 is consistent with the direction of the plate surface 51 of the scraper 5; the width of the plate surface 51 of the scraper 5 is smaller than the width of the zinc pot 10 centimeters, the distance from the probe 61 of the infrared detector 6 to the surface of the zinc bath is 2mm less than the distance from the probe of the infrared detector 6 to the lowermost edge of the 61 scraper plate surface 51.

During hot-dip galvanizing production, guide rails are laid on both sides of the zinc pot, and the dust scraping device A and dust scraping device B stay at the two ends of the zinc pot in a waiting position; before dipping, the electric trolley Ⅰ and electric trolley Ⅱ start at the same time, The dust-scraping devices move towards each other along the guide rails at different speeds (as shown in Figure 3, Ⅰ), and the faster-speed dust-scraping device first passes through the center line of the zinc pot length, as shown in Figure 3. The dust-scraping device B in II , the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device B stop moving at the same time, the deceleration motor starts, the rotation of the rotating shaft drives the scraper and the detector connected to it to rotate at the same time, when the scraper surface and the infrared detector probe rotate to be perpendicular to When the liquid level of the zinc bath is reached, the deceleration motor stops, the electric push rod Ⅰ and the electric push rod Ⅱ shrink at the same time, and the scraper is driven down to a set distance. →Ⅲ), then the dust scraping device B electric trolley Ⅰ and electric trolley Ⅱ start simultaneously and return to one end of the zinc pot along the guide rail; when another dust scraping device A passes the midline of the zinc pot length (Ⅳ ), the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device A stop moving at the same time, the deceleration motor starts, the rotation of the rotating shaft drives the scraper and the detector connected to it to rotate at the same time, when the scraper surface and the infrared detector probe rotate to vertical When the surface of the zinc bath liquid is reached, the deceleration motor stops, and the electric push rod Ⅰ and electric push rod Ⅱ contract simultaneously, driving the scraper down to a set distance. At this time, the lower end of the scraper A is immersed in the zinc bath to a depth of 2 mm (Fig. 3 Ⅴ) After that, the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device A start at the same time and return to one end of the zinc pot along the guide rail. When the two dust scraping devices return to the end of the zinc pot, the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device brake at the same time, and the electric push rod Ⅰ and electric push rod Ⅱ extend at the same time, driving the scraper to rise to the set position. At a fixed distance, the deceleration motor starts. When the surface of the scraper plate is parallel to the surface of the zinc bath, the deceleration motor stops, and the electric trolley Ⅰ and electric trolley Ⅱ start at the same time and continue to walk along the guide rail, driving the ash scraping device to leave the zinc pot to the zinc bath. At the waiting position at the outer end of the pot, the two ash scraping devices are in the state before the ash removal work (Ⅵ→VII→I in Fig. 3); at this point, the ash removal operation is completed, and the workpiece to be plated is moved to the top of the zinc bath, and then descended and immersed in the zinc bath. The bath starts dipping.

Example 3:

The dust scraping device before hot-dip galvanizing and galvanizing described in this embodiment includes an electric trolley I1, an electric push rod I2, a reduction motor 3, a rotating shaft 4, a scraper 5, an infrared detector 6, a bearing support 7, and an electric trolley II8 , electric push rod Ⅱ9, guide rails 10 are provided on both sides of the zinc pot 11, electric trolley Ⅰ1 and electric trolley Ⅱ8 are respectively arranged on the guide rail 10, electric trolley Ⅰ1 and electric trolley Ⅱ8 are respectively connected with electric push rod Ⅰ2 and electric push rod Ⅱ9 The lower end is connected; the deceleration motor 3 is fixed on the upper end of the electric push rod I2, the output shaft of the deceleration motor 3 is connected with the rotating shaft 4, and the other end of the rotating shaft 4 is fixed on the bearing support 7, and the bearing support 7 is fixed on the electric push rod II9. On the telescopic rod; below the rotating shaft 4, there is a scraper 5 and an infrared detector 6; the direction of the probe 61 of the infrared detector 6 is consistent with the direction of the plate surface 51 of the scraper 5; the width of the plate surface 51 of the scraper 5 is smaller than the width of the zinc pot 8 cm, the distance from the probe 61 of the infrared detector 6 to the surface of the zinc bath is 1.5mm less than the distance from the probe of the infrared detector 6 to the lowermost edge of the 61 scraper plate surface 51.

During hot-dip galvanizing production, guide rails are laid on both sides of the zinc pot, and the dust scraping device A and dust scraping device B stay at the two ends of the zinc pot in a waiting position; before dipping, the electric trolley Ⅰ and electric trolley Ⅱ start at the same time, The dust-scraping devices move towards each other along the guide rails at different speeds (as shown in Figure 3, Ⅰ), and the faster-speed dust-scraping device first passes through the center line of the zinc pot length, as shown in Figure 3. The dust-scraping device B in II , the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device B stop moving at the same time, the deceleration motor starts, the rotation of the rotating shaft drives the scraper and the detector connected to it to rotate at the same time, when the scraper surface and the infrared detector probe rotate to be perpendicular to When the liquid level of the zinc bath is reached, the deceleration motor stops, and the electric push rod Ⅰ and the electric push rod Ⅱ contract simultaneously, driving the scraper down to a set distance. At this time, the lower end of the plate surface of the dust scraping device B is immersed in the zinc bath to a depth of 1.5mm (Fig. 3 Ⅱ→Ⅲ), then the dust scraping device B electric trolley Ⅰ and electric trolley Ⅱ start simultaneously and return to one end of the zinc pot along the guide rail; when another dust scraping device A passes the midline of the zinc pot length (as shown in Figure Ⅳ), the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device A stop moving at the same time, the deceleration motor starts, and the rotation of the rotating shaft drives the scraper and the detector connected to it to rotate at the same time. When the scraper surface and the infrared detector probe rotate to When it is perpendicular to the liquid surface of the zinc bath, the deceleration motor stops, and the electric push rod Ⅰ and the electric push rod Ⅱ shrink at the same time, driving the scraper down to a set distance. At this time, the lower end of the scraping device A is immersed in the zinc bath to a depth of 1.5mm (Fig. Ⅴ in 3), then the dust scraping device A electric trolley Ⅰ and electric trolley Ⅱ start at the same time and return to one end of the zinc pot along the guide rail. When the two dust scraping devices return to the end of the zinc pot, the electric trolley Ⅰ and electric trolley Ⅱ of the dust scraping device brake at the same time, and the electric push rod Ⅰ and electric push rod Ⅱ extend at the same time, driving the scraper to rise to the set position. At a fixed distance, the deceleration motor starts. When the surface of the scraper plate is parallel to the surface of the zinc bath, the deceleration motor stops, and the electric trolley Ⅰ and electric trolley Ⅱ start at the same time and continue to walk along the guide rail, driving the ash scraping device to leave the zinc pot to the zinc bath. At the waiting position at the outer end of the pot, the two ash scraping devices are in the state before the ash removal work (Ⅵ→VII→I in Fig. 3); at this point, the ash removal operation is completed, and the workpiece to be plated is moved to the top of the zinc bath, and then descended and immersed in the zinc bath. The bath starts dipping.

Claims (6)

1. A dust scraping device for hot-dip galvanizing before dipping, characterized in that it includes electric trolley I (1), electric push rod I (2), geared motor (3), rotating shaft (4), scraper ( 5), infrared detector (6), bearing support (7), electric trolley II (8), electric push rod II (9), guide rails (10) on both sides of the zinc pot (11), and guide rails (10) There are electric trolley Ⅰ (1) and electric trolley Ⅱ (8) respectively, and electric trolley Ⅰ (1) and electric trolley Ⅱ (8) are respectively connected with electric push rod Ⅰ (2) and electric push rod Ⅱ (9). The lower end is connected; the deceleration motor (3) is fixed on the upper end of the electric push rod I (2), the output shaft of the deceleration motor (3) is connected with the rotating shaft (4), and the other end of the rotating shaft (4) is fixed on the bearing support (7) , the bearing support (7) is fixed on the telescopic rod of the electric push rod II (9); a scraper (5) and an infrared detector (6) are provided below the rotating shaft (4). 2. The soot scraping device for hot-dip galvanizing before dipping according to claim 1, characterized in that: the direction of the probe (61) of the infrared detector (6) and the board surface (51) of the scraper (5) The same direction. 3. The soot scraping device for hot-dip galvanizing before dipping according to claim 1 or 2, characterized in that: the width of the scraper (5) on the surface (51) is smaller than the width of the zinc pot. 4. The ash scraping device for hot-dip galvanizing before dipping according to claim 3, characterized in that: the width of the scraper (5) on the surface (51) is 5-10 cm smaller than the width of the zinc pot. 5. The soot scraping device for hot-dip galvanizing before dipping according to claim 1, characterized in that: during ash removal operation, the distance from the probe (61) of the infrared detector (6) to the surface of the zinc bath is shorter than that of the infrared detector The distance from the probe (61) of (6) to the lowermost edge of the scraper (5) board surface (51) is 1-2mm smaller. 6. The soot scraping device for hot-dip galvanizing before dipping according to claim 1, characterized in that: the electric trolley I (1) and electric trolley II (8) are pre-laid on both sides of the zinc pot along the length direction rail moves.