阅读说明：本技术 一种镀锌钢管热浸镀锌处理工艺 (Hot-dip galvanizing treatment process for galvanized steel pipe ) 是由 郑文豪 张伟健 于 2019-11-04 设计创作，主要内容包括：本发明涉及一种镀锌钢管热浸镀锌处理工艺,包括镀锌槽、固定装置与沥干装置,所述镀锌槽左右两端安装有固定装置,镀锌槽上端安装有沥干装置,固定装置包括可伸缩支架、支撑板、电机、齿轮一、齿轮二、卡块一与固定架,利用卡块一与固定架对管件左右两侧进行密封固定,以达到单面镀锌的目的,通过沥干装置对管件进行沥干并对管件表面进行处理,节省了后期的处理工序,且避免了将管件进行倾斜放置,从而导致管件表面镀锌不均匀,V形凹槽加快多余的锌液向下流动并聚集,刮刀中部的矩形片将转动中的管件表面的锌瘤、锌刺进行清除,圆弧板对管件表面进行抛光处理,以达到提高管件质量的目的。(The invention relates to a hot-dip galvanizing treatment process for galvanized steel pipes, which comprises a galvanizing bath, a fixing device and a draining device, wherein the left end and the right end of the galvanizing bath are provided with the fixing device, the upper end of the galvanizing bath is provided with the draining device, the fixing device comprises a telescopic bracket, a supporting plate, a motor, a first gear, a second gear, a first clamping block and a fixing frame, the left side and the right side of a pipe fitting are sealed and fixed by the first clamping block and the fixing frame so as to achieve the aim of single-side galvanizing, the pipe fitting is drained by the draining device and the surface of the pipe fitting is treated, the later treatment process is saved, the pipe fitting is prevented from being obliquely placed, so that the surface of the pipe fitting is unevenly galvanized, redundant zinc liquid accelerated by a V-shaped groove flows downwards and gathers, a rectangular sheet in the middle of a scraper removes zinc nodules and zinc burrs on the surface of the rotating pipe fitting, and, so as to achieve the purpose of improving the quality of the pipe fitting.)

1. A hot-dip galvanizing treatment process for galvanized steel pipes is characterized in that: the method mainly comprises the following steps:

s1, heating the plating solution: adjusting the temperature of the galvanizing liquid to 430-460 ℃ to ensure that the working temperature is in a proper temperature range;

s2, steel pipe treatment: after the molten zinc is heated in step S1, the surface of the steel pipe is polished to remove dust and oxides on the surface;

s3, fixing the pipe fitting: after the pipe fitting of the step S2 is processed, the pipe fitting is fixed through a galvanizing treatment device, the left side and the right side of the pipe fitting are sealed, the pipe fitting is quickly immersed into galvanizing liquid through the galvanizing treatment device, and the galvanizing treatment device drives the pipe fitting to rotate, so that the galvanizing time of the pipe fitting is shortened;

s4, post-plating treatment: after the pipe fitting is subjected to dip plating in the step S3, the pipe fitting is taken out and simultaneously is contacted with the pipe fitting through a galvanizing processing device, so that the drying time of the pipe fitting is shortened;

s5, collecting pipe fittings: after the galvanized pipe is processed in step S4, the pipe is collected.

The galvanizing treatment equipment used in the S1-S5 comprises a galvanizing bath (1), fixing devices (2) and a draining device (3), wherein the fixing devices (2) are installed at the left end and the right end of the galvanizing bath (1), and the draining device (3) is installed at the upper end of the galvanizing bath (1); wherein:

the fixing device (2) comprises a telescopic support (21), a support plate (22), a motor (23), a first gear (24), a second gear (25), a first fixture block (26) and a fixing frame (27), rectangular grooves are formed in the left side and the right side of the galvanizing bath (1), the telescopic support (21) is fixedly installed in the left rectangular groove, a hydraulic cylinder is arranged in the telescopic support (21), the support plate (22) is fixedly installed at the upper end of the telescopic support (21), the motor (23) is fixedly installed in the middle of the support plate (22), the front end and the rear end of the support plate (22) are uniformly connected with a rotating rod in a sliding fit manner, a gear is fixedly installed at the right end of the motor (23) through a shaft coupler, the front side and the rear side of the support plate (22) are uniformly connected with the rotating rod in a sliding fit manner, a second gear (25), a first clamping block (26) is fixedly installed at the tail end of the rotating rod, a first clamping block (26) is fixedly installed at the tail end of a coupler of the motor (23), and the front side and the rear side of the supporting plate (22) are uniformly connected with the fixing frame (27) in a sliding fit mode;

the draining device (3) comprises an active frame (31), a driven frame (32) and a contact rod (33), the active frame (31) is fixedly mounted at the upper end of the galvanizing bath (1), the front end of the active frame (31) is connected with the driven frame (32) in a sliding fit mode, and the contact rod (33) is fixedly mounted at the right end of the lower side of the driven frame (32).

2. The hot-dip galvanizing process for galvanized steel pipes according to claim 1, characterized in that: the left side and the right side of the upper end of the galvanizing tank (1) are respectively provided with a support frame, the support frames are rectangular plates provided with grooves, the rectangular plate at the left end is fixedly provided with an active frame (31), and the rectangular plate at the right end is connected with a contact rod (33) in a sliding fit mode.

3. The hot-dip galvanizing process for galvanized steel pipes according to claim 1, characterized in that: the first clamping block (26) comprises a circular table block (261), a cylindrical block (262), a spring (263) and an arc-shaped plate (264), the circular table block (261) is fixedly mounted at the tail end of a coupler of the motor (23), high-temperature-resistant rubber is arranged on the surface of the circular table block (261), the cylindrical block (262) is fixedly mounted at the right end of the circular table block (261), the spring (263) is uniformly and fixedly mounted along the circumferential direction of the cylindrical block (262), a small support is arranged in the spring (263), and the arc-shaped block is fixedly mounted at the tail end of the spring (263).

4. The hot-dip galvanizing process for galvanized steel pipes according to claim 1, characterized in that: the fixing frame (27) comprises a large rectangular plate (271), a cylindrical rod (272) and a second clamping block (273), the rectangular groove at the right end of the galvanizing bath (1) is connected with the large rectangular plate (271) in a sliding fit mode, the left end of the large rectangular plate (271) is uniformly provided with a circular groove, the cylindrical rod (272) is installed in the circular groove through a bearing, and the left end of the cylindrical rod (272) is fixedly provided with the second clamping block (273).

5. The hot-dip galvanizing process for galvanized steel pipes according to claim 1, characterized in that: the driving frame (31) comprises a rectangular cross rod (311), small balls (312) and a rectangular vertical rod (313), the supporting frame at the upper end of the left side of the galvanizing bath (1) is fixedly provided with the rectangular cross rod (311), the middle of the rectangular cross rod (311) is provided with a square groove, the square groove is uniformly provided with the small balls (312) through a pin shaft, the small balls (312) are connected with the rectangular vertical rod (313) in a sliding fit mode, and the upper end and the lower end of the rectangular vertical rod (313) are provided with square blocks larger than the square groove.

6. The hot-dip galvanizing process for galvanized steel pipes according to claim 1, characterized in that: driven frame (32) are including square slider (321), cradling piece (322) and cylinder pole setting (323), the step-shaped groove has been seted up on rectangle horizontal pole (311), the step-shaped inslot evenly is connected with square slider (321) with sliding fit's mode, square slider (321) upper end of rearmost end is connected with cradling piece (322) one end through the round pin axle, cradling piece (322) other end is connected with rectangle pole setting (313) upper end through the round pin axle, the upper end is connected through the rectangular rod between two adjacent square slider (321), square slider (321) lower extreme fixed mounting has cylinder pole setting (323).

7. The hot-dip galvanizing process for galvanized steel pipes according to claim 1, characterized in that: contact bar (33) are cylindrical, and the V-arrangement recess has evenly been seted up on both ends surface around contact bar (33), and contact bar (33) upper end is provided with the scraper, and the scraper middle part is provided with sharp rectangle piece, and bilateral symmetry is provided with the circular arc board around, and the circular arc board surface is provided with the block rubber.

8. The hot-dip galvanizing process for galvanized steel pipes according to claim 4, characterized in that: the structure of the second clamping block (273) is approximately the same as that of the first clamping block (26), only the left end of the cylindrical block is provided with a cylindrical rod, and the tail end of the cylindrical rod is provided with a magnet.

Technical Field

The invention relates to the technical field of galvanized steel surface treatment, in particular to a hot-dip galvanizing treatment process for a galvanized steel pipe.

Background

Hot dip galvanizing is a process of immersing a cleaned iron piece into a zinc bath through the wetting action of a plating assistant agent to react the steel with molten zinc to form an alloyed coating, and because the steel is very easy to rust in the use environment, galvanizing is indispensable in production and processing, and hot dip galvanizing is widely used because of the best corrosion prevention effect and economic benefit.

In the hot dip galvanizing process, due to structural limitations of pipe members, there are the following problems in the actual operation:

(1) the traditional hot-dip galvanizing treatment equipment mainly aims at double-sided galvanizing, and along with the requirement of social development, workpieces with single-sided galvanizing are more and more required, and the traditional hot-dip galvanizing treatment equipment cannot meet the current production requirement.

(2) The traditional hot-dip galvanizing treatment equipment generally inclines the galvanized pipe to accelerate the excessive zinc water to flow downwards into the galvanizing bath, but the lower end of the inclined pipe is easy to collect zinc liquid, so that the galvanizing on the surface of the pipe is not uniform.

Disclosure of Invention

In order to make up the defects of the prior art, the invention provides a hot-dip galvanizing treatment process for galvanized steel pipes.

The technical scheme adopted by the invention to solve the technical problem is as follows: a hot-dip galvanizing treatment process for galvanized steel pipes is characterized in that: the method mainly comprises the following steps:

s1, heating the plating solution: adjusting the temperature of the galvanizing liquid to 430-460 ℃ to ensure that the working temperature is in a proper temperature range;

s2, steel pipe treatment: after the molten zinc is heated in step S1, the surface of the steel pipe is polished to remove dust and oxides on the surface;

s3, fixing the pipe fitting: after the pipe fitting of the step S2 is processed, the pipe fitting is fixed through a galvanizing treatment device, the left side and the right side of the pipe fitting are sealed, the pipe fitting is quickly immersed into galvanizing liquid through the galvanizing treatment device, and the galvanizing treatment device drives the pipe fitting to rotate, so that the galvanizing time of the pipe fitting is shortened;

s4, post-plating treatment: after the pipe fitting is subjected to dip plating in the step S3, the pipe fitting is taken out and simultaneously is contacted with the pipe fitting through a galvanizing processing device, so that the drying time of the pipe fitting is shortened;

s5, collecting pipe fittings: after the galvanized pipe is processed in step S4, the pipe is collected.

The galvanizing treatment equipment used in the S1-S5 comprises a galvanizing bath, fixing devices and a draining device, wherein the fixing devices are arranged at the left end and the right end of the galvanizing bath, and the draining device is arranged at the upper end of the galvanizing bath; wherein:

the fixing device comprises a telescopic bracket, a supporting plate, a motor, a first gear, a second gear, a first clamping block and a fixing frame, rectangular grooves are formed in the left side and the right side of the galvanizing bath, the telescopic bracket is fixedly arranged in the rectangular groove on the left side, a hydraulic cylinder is arranged in the telescopic support, a support plate is fixedly arranged at the upper end of the telescopic support, a motor is fixedly arranged in the middle of the support plate, the front end and the rear end of the support plate are uniformly connected with a rotating rod in a sliding fit manner, a gear is fixedly arranged on an output shaft at the right end of the motor through a coupler, the front side and the rear side of the support plate are uniformly connected with the rotating rod in a sliding fit manner, a gear II is fixedly arranged at the right end of the rotating rod and is meshed with the gear I, a fixture block I is fixedly arranged at the tail end of the rotating rod, a fixture block I; the first clamping block is connected with the fixing frame, the telescopic support drives the supporting plate, so that all the pipe fittings are driven to move downwards until the pipe fittings enter the galvanizing liquid, and the motor, the first gear and the second gear drive all the pipe fittings to rotate at a constant speed, so that the aim of accelerating the galvanizing speed of the pipe fittings is fulfilled.

The draining device comprises a driving frame, a driven frame and a contact rod, wherein the driving frame is fixedly arranged at the upper end of the galvanizing bath, the front end of the driving frame is connected with the driven frame in a sliding fit manner, and the contact rod is fixedly arranged at the right end of the lower side of the driven frame; after the pipe fitting galvanization is finished, the telescopic support drives the pipe fitting to move upwards until the supporting plate is contacted with the driving frame, so that the driving frame moves upwards, the driven frame is driven to move backwards, the contact rod is connected with the right lower end of the pipe fitting, redundant zinc liquid is drained and dripped to a galvanizing bath, and the contact rod can clean zinc nodules and zinc burrs on the surface of the rotating pipe fitting.

As a preferred technical scheme of the invention, the left side and the right side of the upper end of the galvanizing bath are both provided with supporting frames, the supporting frames are rectangular plates provided with grooves, the rectangular plate at the left end is fixedly provided with an active frame, and the rectangular plate at the right end is connected with a contact rod in a sliding fit manner; the zinc liquid of galvanizing bath lower extreme carries out the galvanizing to the pipe fitting, and the support frame is only installed at both ends about the galvanizing bath upper end, is favorable to the air flow to accelerate the drippage of pipe fitting.

As a preferred technical scheme, the fixture block comprises a circular table block, a cylindrical block, a spring and an arc-shaped plate, the circular table block is fixedly installed at the tail end of the motor coupler, high-temperature-resistant rubber is arranged on the surface of the circular table block, the cylindrical block is fixedly installed at the right end of the circular table block, the spring is uniformly and fixedly installed on the cylindrical block along the circumferential direction, a small support is arranged in the spring, and the arc-shaped block is fixedly installed at the tail end of the spring; the round platform piece seals pipe fitting left end inboard to prevent that zinc liquid from getting into the pipe fitting inboard and carry out the galvanizing to the pipe fitting inboard, the spring further compresses tightly the pipe fitting with the cooperation of arc piece, and the high temperature resistant rubber that the round platform piece surface set up utilizes elasticity to seal the pipe fitting left end.

According to a preferred technical scheme, the fixing frame comprises a large rectangular plate, a cylindrical rod and a second clamping block, the rectangular groove at the right end of the galvanizing bath is connected with the large rectangular plate in a sliding fit mode, circular grooves are uniformly formed in the left end of the large rectangular plate, the cylindrical rod is mounted in the circular grooves through bearings, and the second clamping block is fixedly mounted at the left end of the cylindrical rod; the right end of the pipe fitting is sealed by the fixture block II, and the large rectangular plate and the cylindrical rod drive all the pipe fittings to slide smoothly in the galvanizing bath.

As a preferred technical scheme of the invention, the driving frame comprises a rectangular cross rod, small balls and a rectangular vertical rod, the supporting frame at the upper end of the left side of the galvanizing bath is fixedly provided with the rectangular cross rod, the middle part of the rectangular cross rod is provided with a square groove, the small balls are uniformly arranged in the square groove through a pin shaft and are connected with the rectangular vertical rod in a sliding fit manner, and the upper end and the lower end of the rectangular vertical rod are both provided with square blocks larger than the square groove; the telescopic bracket drives the supporting plate to move upwards, the upper end of the supporting plate is in contact with the lower end of the rectangular vertical rod, so that the rectangular vertical rod is driven to move upwards, and the sliding friction between the rectangular vertical rod and the rectangular transverse rod is changed into rolling friction by the small balls arranged in the square grooves, so that the friction force is reduced, and the movement of the rectangular vertical rod is facilitated.

According to a preferred technical scheme, the driven frame comprises square sliding blocks, support rods and cylindrical vertical rods, step-shaped grooves are formed in rectangular cross rods, the step-shaped grooves are uniformly connected with the square sliding blocks in a sliding fit mode, the upper ends of the square sliding blocks at the rearmost ends are connected with one ends of the support rods through pin shafts, the other ends of the support rods are connected with the upper ends of the rectangular vertical rods through pin shafts, the upper ends of every two adjacent square sliding blocks are connected through the rectangular rods, and the cylindrical vertical rods are fixedly mounted at the lower ends of the square sliding blocks; the rectangular vertical rod moves upwards to drive the angle of the support rod to change, and finally the cylindrical vertical rod below the square sliding block is driven to move backwards.

According to a preferred technical scheme, the contact rod is cylindrical, V-shaped grooves are uniformly formed in the surfaces of the front end and the rear end of the contact rod, a scraper is arranged at the upper end of the contact rod, a sharp rectangular sheet is arranged in the middle of the scraper, arc plates are symmetrically arranged on the front side and the rear side of the scraper, and rubber blocks are arranged on the surfaces of the arc plates; thereby the cylinder pole setting moves backward and drives the contact lever and contact with the pipe fitting lower extreme, the arc board strikes off unnecessary zinc liquid to V-arrangement recess with the pipe fitting contact, the speed that unnecessary zinc liquid flows downwards is accelerated to V-arrangement recess, final unnecessary zinc liquid gathering drips to the galvanizing bath in, the pipe fitting surface's that the rectangle piece will rotate zinc tumour, the zinc thorn is clear away, the block rubber on the arc board has great elasticity, neither can be because of the zinc tumour on pipe fitting surface, the zinc thorn produces the hindrance to pipe fitting rotation, can carry out polishing treatment to advancing the pipe fitting surface after clearing away, in order to reach the purpose that improves the pipe fitting quality.

As a preferred technical scheme of the invention, the structure of the second clamping block is substantially the same as that of the first clamping block, only the left end of the cylindrical block is provided with the cylindrical rod, and the tail end of the cylindrical rod is provided with the magnet; when the right ends of the two pairs of pipe fittings of the clamping blocks are sealed and fixed, the magnets on the cylindrical rods are in contact with the cylindrical blocks of the first clamping blocks, and the sealing degree of the left end and the right end of the pipe fittings is further improved.

Compared with the prior art, the invention has the following advantages:

1. according to the hot-dip galvanizing treatment equipment for the galvanized steel pipe, the left side and the right side of the pipe fitting are sealed and fixed through the first clamping block and the fixing frame, so that the purpose of single-side galvanizing is achieved, the pipe fitting is drained through the draining device, the surface of the pipe fitting is treated, the later treatment process is saved, and the phenomenon that the surface of the pipe fitting is not uniformly galvanized due to the fact that the pipe fitting is obliquely placed is avoided.

2. According to the invention, all the pipe fittings are driven to rotate at a constant speed through the arranged fixing device and the motor, the first gear and the second gear, so that the aim of accelerating the galvanizing speed of the pipe fittings is achieved, the inner sides of the left ends of the pipe fittings are sealed by the circular truncated cone blocks, so that zinc liquid is prevented from entering the inner sides of the pipe fittings to galvanize the inner sides of the pipe fittings, the pipe fittings are further pressed by the cooperation of the springs and the arc blocks, and the left ends of the pipe fittings are further sealed by high-temperature-resistant rubber arranged on the surfaces of the circular truncated.

3. According to the invention, through the arranged draining device, the telescopic support drives the pipe fitting to move upwards, and finally the support plate is in contact with the driving frame, so that the driving frame moves upwards, the driven frame is driven to move backwards, the contact rod is connected with the right lower end of the pipe fitting, and the redundant zinc liquid is drained and dripped to the galvanizing bath, and the draining process is carried out by utilizing the upward pipe fitting, so that the pipe fitting is in contact with the contact rod, and the draining speed is further accelerated.

4. According to the invention, through the arranged draining device, the V-shaped groove accelerates the downward flow and accumulation of redundant zinc liquid, the rectangular sheet in the middle of the scraper removes zinc nodules and zinc burrs on the surface of the rotating pipe fitting, and the arc plate polishes the surface of the pipe fitting so as to achieve the purpose of improving the quality of the pipe fitting.

Drawings

The invention is further illustrated with reference to the following figures and examples.

FIG. 1 is a schematic plan view of the present invention;

FIG. 2 is a schematic view of the present invention in a cross-sectional plan configuration;

FIG. 3 is a schematic top plan view of the present invention;

FIG. 4 is a schematic plan view of a first latch of the present invention;

fig. 5 is a schematic plan view of the contact bar of the present invention.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further explained with reference to fig. 1 to 5.

A hot-dip galvanizing treatment process for galvanized steel pipes is characterized in that: the method mainly comprises the following steps:

s1, heating the plating solution: adjusting the temperature of the galvanizing liquid to 430-460 ℃ to ensure that the working temperature is in a proper temperature range;

s2, steel pipe treatment: after the molten zinc is heated in step S1, the surface of the steel pipe is polished to remove dust and oxides on the surface;

s3, fixing the pipe fitting: after the pipe fitting of the step S2 is processed, the pipe fitting is fixed through a galvanizing treatment device, the left side and the right side of the pipe fitting are sealed, the pipe fitting is quickly immersed into galvanizing liquid through the galvanizing treatment device, and the galvanizing treatment device drives the pipe fitting to rotate, so that the galvanizing time of the pipe fitting is shortened;

s4, post-plating treatment: after the pipe fitting is subjected to dip plating in the step S3, the pipe fitting is taken out and simultaneously is contacted with the pipe fitting through a galvanizing processing device, so that the drying time of the pipe fitting is shortened;

s5, collecting pipe fittings: after the galvanized pipe is processed in step S4, the pipe is collected.

The galvanizing treatment equipment used in the S1-S5 comprises a galvanizing bath 1, fixing devices 2 and a draining device 3, wherein the fixing devices 2 are arranged at the left end and the right end of the galvanizing bath 1, and the draining device 3 is arranged at the upper end of the galvanizing bath 1; wherein:

the fixing device 2 comprises a telescopic bracket 21, a support plate 22, a motor 23, a first gear 24, a second gear 25, a first fixture block 26 and a fixing frame 27, rectangular grooves are formed in the left side and the right side of the galvanizing bath 1, the telescopic bracket 21 is fixedly installed in the left rectangular groove, a hydraulic cylinder is arranged in the telescopic bracket 21, the support plate 22 is fixedly installed at the upper end of the telescopic bracket 21, the motor 23 is fixedly installed in the middle of the support plate 22, the front end and the rear end of the support plate 22 are uniformly connected with a rotating rod in a sliding fit manner, a gear is fixedly installed on an output shaft at the right end of the motor 23 through a coupler, the front side and the rear side of the support plate 22 are uniformly connected with the rotating rod in a sliding fit manner, the second gear 25 is fixedly installed at the right end of the rotating rod, the front and rear sides of the supporting plate 22 are evenly connected with the fixing frame 27 in a sliding fit manner;

the first fixture block 26 comprises a circular table block 261, a cylindrical block 262, a spring 263 and an arc-shaped plate 264, the circular table block 261 is fixedly installed at the tail end of the coupling of the motor 23, high-temperature-resistant rubber is arranged on the surface of the circular table block 261, the cylindrical block 262 is fixedly installed at the right end of the circular table block 261, the spring 263 is uniformly and fixedly installed on the cylindrical block 262 along the circumferential direction, a small support is arranged in the spring 263, and the arc-shaped block is fixedly installed at the tail end of the;

the fixing frame 27 comprises a large rectangular plate 271, a cylindrical rod 272 and a second clamping block 273, the rectangular groove at the right end of the galvanizing bath 1 is connected with the large rectangular plate 271 in a sliding fit mode, circular grooves are uniformly formed in the left end of the large rectangular plate 271, the cylindrical rod 272 is installed in the circular grooves through bearings, and the second clamping block 273 is fixedly installed at the left end of the cylindrical rod 272;

the telescopic bracket 21 drives the supporting plate 22 to drive all the pipe fittings to move downwards through the connection of the first clamping block 26 and the fixed frame 27 until the pipe fittings enter the galvanizing liquid, and the motor 23, the first gear 24 and the second gear 25 drive all the pipe fittings to rotate at a constant speed so as to achieve the purpose of accelerating the galvanizing speed of the pipe fittings;

the round table block 261 seals the inner side of the left end of the pipe fitting to prevent zinc liquid from entering the inner side of the pipe fitting to galvanize the inner side of the pipe fitting, the spring 263 is matched with the arc-shaped block to further compress the pipe fitting, and high-temperature-resistant rubber arranged on the surface of the round table block 261 seals the left end of the pipe fitting by elasticity;

the second fixture block 273 seals the right end of the pipe fitting, and the large rectangular plate 271 and the cylindrical rod 272 drive all the pipe fittings to slide smoothly in the galvanizing bath 1.

The draining device 3 comprises a driving frame 31, a driven frame 32 and a contact rod 33, wherein the driving frame 31 is fixedly arranged at the upper end of the galvanizing bath 1, the front end of the driving frame 31 is connected with the driven frame 32 in a sliding fit manner, and the contact rod 33 is fixedly arranged at the right end of the lower side of the driven frame 32;

the driving frame 31 comprises a rectangular cross rod 311, small balls 312 and a rectangular upright rod 313, the rectangular cross rod 311 is fixedly mounted on a supporting frame at the upper end of the left side of the galvanizing bath 1, a square groove is formed in the middle of the rectangular cross rod 311, the small balls 312 are uniformly mounted in the square groove through a pin shaft, the small balls 312 are connected with the rectangular upright rod 313 in a sliding fit manner, and square blocks larger than the square groove are arranged at the upper end and the lower end of the rectangular upright rod 313;

the driven frame 32 comprises square sliding blocks 321, support rods 322 and cylindrical upright rods 323, stepped grooves are formed in the rectangular cross rods 311, the stepped grooves are uniformly connected with the square sliding blocks 321 in a sliding fit mode, the upper ends of the square sliding blocks 321 at the rearmost ends are connected with one ends of the support rods 322 through hinge pins, the other ends of the support rods 322 are connected with the upper ends of the rectangular upright rods 313 through hinge pins, the upper ends of every two adjacent square sliding blocks 321 are connected through the rectangular rods, and the cylindrical upright rods 323 are fixedly mounted at the lower ends of the square sliding blocks 321;

the contact rod 33 is cylindrical, V-shaped grooves are uniformly formed in the surfaces of the front end and the rear end of the contact rod 33, a scraper is arranged at the upper end of the contact rod 33, a sharp rectangular sheet is arranged in the middle of the scraper, arc plates are symmetrically arranged on the front side and the rear side of the scraper, and rubber blocks are arranged on the surfaces of the arc plates;

after the pipe fitting is galvanized, the telescopic bracket 21 drives the pipe fitting to move upwards until the support plate 22 is contacted with the driving frame 31, so that the driving frame 31 moves upwards, the driven frame 32 is driven to move backwards, the contact rod 33 is connected with the right lower end of the pipe fitting, and redundant zinc liquid is drained and dripped to the galvanizing bath 1, and the contact rod 33 can clean zinc nodules and zinc burrs on the surface of the rotating pipe fitting;

the telescopic bracket 21 drives the supporting plate 22 to move upwards, the upper end of the supporting plate 22 is contacted with the lower end of the rectangular vertical rod 313 so as to drive the rectangular vertical rod 313 to move upwards, and the sliding friction between the rectangular vertical rod 313 and the rectangular cross rod 311 is changed into rolling friction by the small ball 312 arranged in the square groove, so that the friction force is reduced, and the movement of the rectangular vertical rod 313 is facilitated;

the rectangular upright 313 moves upwards, so that the angle of the support rod 322 is changed, and finally the cylindrical upright 323 below the square sliding block 321 is driven to move backwards;

thereby cylinder pole setting 323 moves backward and drives contact bar 33 and pipe fitting lower extreme and contact, the arc board strikes off unnecessary zinc liquid to the V-arrangement recess with pipe fitting contact, the speed that unnecessary zinc liquid flows downwards is accelerated to the V-arrangement recess, final unnecessary zinc liquid gathering drips to the galvanizing bath in, the rectangle piece is with the pipe fitting surface's in the rotation zinc tumour, the zinc thorn is clear away, the block rubber on the arc board has great elasticity, neither can be because of the pipe fitting surface zinc tumour, the zinc thorn produces the hindrance to pipe fitting rotation, can carry out polishing treatment to the pipe fitting surface after advancing to clear away, in order to reach the purpose that improves the pipe fitting quality.

The left side and the right side of the upper end of the galvanizing bath 1 are both provided with support frames, the support frames are rectangular plates provided with grooves, the rectangular plate at the left end is fixedly provided with a driving frame 31, and the rectangular plate at the right end is connected with a contact rod 33 in a sliding fit manner; the zinc liquid of 1 lower extreme of galvanizing bath carries out the galvanizing to the pipe fitting, and the support frame is only installed at both ends about 1 upper end of galvanizing bath, is favorable to the air to flow to accelerate the drippage of pipe fitting.

The structure of the second clamping block 273 is approximately the same as that of the first clamping block 26, a cylindrical rod is arranged at the left end of the cylindrical block, and a magnet is arranged at the tail end of the cylindrical rod; when the second clamping block 273 is used for sealing and fixing the right end of the pipe fitting, the magnet on the cylindrical rod is in contact with the cylindrical block 262 of the first clamping block 26, and the sealing degree of the left end and the right end of the pipe fitting is further improved.

The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are given by way of illustration of the principles of the present invention, and that various changes and modifications may be made without departing from the spirit and scope of the invention as defined by the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.