CN111705282A

CN111705282A - Production process of high-strength galvanized steel coil

Info

Publication number: CN111705282A
Application number: CN202010592411.XA
Authority: CN
Inventors: 陈超; 周毅
Original assignee: Zhejiang Southeastern New Wood Technology Co ltd
Current assignee: Zhejiang Southeastern New Wood Technology Co ltd
Priority date: 2020-06-24
Filing date: 2020-06-24
Publication date: 2020-09-25
Anticipated expiration: 2040-06-24
Also published as: CN111705282B

Abstract

The invention relates to a production process of a high-strength galvanized steel coil, which comprises the following steps: s1, uncoiling the steel coil, cutting and welding by using a seam welder; s2, degreasing, and drying with hot air to obtain a degreased steel coil; s3, annealing the steel coil in the S2; s4, feeding the galvanized steel coil into a heated zinc pot, and then sequentially carrying out air knife blowing, cooling, hot air drying and steel coil finishing to obtain the galvanized steel coil; s5, passivating the steel coil, namely, using two hollow coating liquid rollers with openings to contain passivation liquid, sleeving cotton cloth sleeves outside the coating liquid rollers, feeding the galvanized steel coil obtained in the step S4 into a hot air drying box for heating and drying, and allowing the passivation liquid to seep out of the coating liquid rollers and be uniformly coated on the steel coil through the cotton cloth sleeves; s6, drying by hot air; s7, standing for 12 hours, and then oiling; s8, cutting, curling, unwinding and packaging. The invention can carry out more effective passivation of the steel coil and reduce the possibility of environmental pollution caused by the passivation solution.

Description

Production process of high-strength galvanized steel coil

Technical Field

The invention relates to the technical field of steel coil processing, in particular to a production process of a high-strength galvanized steel coil.

Background

At present, a cold-rolled hard steel coil is taken as a raw material in the production process of a hot-dip galvanized steel coil, and the cold-rolled hard steel coil is immersed in a molten zinc bath, so that a layer of zinc is adhered to the surface of the cold-rolled hard steel coil. The galvanized steel coil has excellent corrosion resistance, can prolong the service life, and is widely applied to the industries of buildings, light industry, automobiles, agriculture, animal husbandry, fishery, commerce and the like, such as the building industry, which is mainly used for manufacturing corrosion-resistant industrial and civil building roof panels, roof grids and the like.

The prior Chinese patent with publication number CN1974836B discloses a method for manufacturing a hot-dip galvanized fingerprint-resistant plate, which comprises an uncoiling process, a straightening process, a head and tail cutting process, a welding process, a cleaning process, an annealing process, a galvanizing process, a cooling process, an intermediate looping process, a finishing process, a straightening and withdrawal process, a roller coating process, a drying process, a cooling process, an outlet looping process, a trimming process, an oiling process and a coiling process, wherein in the galvanizing process, the weight concentration of Al in a galvanizing solution is as follows: 0.17-0.23%; the weight concentration of Pb is less than or equal to 0.003 percent; the temperature of the zinc liquid is 455-465 ℃.

The above prior art solutions have the following drawbacks: in order to promote its anticorrosive ability after the coil of strip galvanizing, when carrying out the passivation of galvanized steel coil among the prior art, generally can send the galvanized steel coil into the pond that contains the passivation liquid, carry out the drying after sending back through the roller conveying, the coil of strip surface can adhere to more passivation liquid after the passivation, the passivation liquid drop falls behind and can cause the pollution, also need add more passivation liquid in the passivation pond simultaneously, what use also is a fraction of passivation liquid, the passivation liquid of depositing in a large number also leads to the fact the pollution easily, consequently, need provide a survival technology, can carry out more effective coil of strip passivation, reduce the possibility of passivation liquid polluted environment.

Disclosure of Invention

Aiming at the defects in the prior art, the invention aims to provide a production process of a high-strength galvanized steel coil, which has the effects of more effectively passivating the steel coil and reducing the pollution of passivation solution.

The above object of the present invention is achieved by the following means.

A production process of a high-strength galvanized steel coil comprises the following steps:

s1, uncoiling the steel coil, cutting and welding by using a seam welder;

s2, introducing the steel coil into a degreasing tank filled with a degreasing agent for degreasing, and drying by hot air to obtain a degreased steel coil;

s3, annealing the steel coil in the S2;

s4, feeding the steel coil obtained in the S3 into a heated zinc pot, wherein the infiltration time of the steel coil is 4-5S, and then sequentially carrying out air knife blowing, cooling, hot air drying and steel coil finishing to obtain the galvanized steel coil;

s5, passivating the steel coil, namely, using two hollow coating liquid rollers with openings to contain passivation liquid, sleeving cotton cloth sleeves outside the coating liquid rollers, feeding the galvanized steel coil obtained in the step S4 into a hot air drying box for heating and drying, then introducing the galvanized steel coil into the space between the coating liquid rollers, and enabling the passivation liquid to seep out of the coating liquid rollers and be uniformly coated on the steel coil through the cotton cloth sleeves to achieve passivation;

s6, carrying out hot air drying on the passivated steel coil through a hot air dryer to form a surface film on the surface of the steel coil;

s7, standing the galvanized steel coil obtained in the step S6 for 12 hours, and oiling the galvanized steel coil through an electrostatic oiling machine;

and S8, slitting, curling, coil discharging and packaging the steel coil obtained in the S7.

By adopting the technical scheme, the steel coil is degreased before galvanization, then the steel coil is sent into a high-temperature zinc pot to galvanize the steel coil to form a galvanized steel coil, and then air knife purging is carried out, so that the uniform distribution of a zinc layer is improved, the formed galvanized steel coil has uniform thickness, and the galvanized steel coil is more stably protected by the zinc layer; passivating and oiling to provide a layer of protective film for the steel coil; the hollow liquid coating roller is adopted to coat the passivation liquid on the steel coil, so that the passivation agent can be uniformly coated on the steel coil, and only the passivation agent exists in the accommodating groove, a passivation pool is not needed to store a large amount of passivation agent, meanwhile, the passivation agent attached to the steel coil cannot be excessive, and the possibility of passivation agent pollution is reduced.

The present invention in a preferred example may be further configured to: the liquid coating roller comprises an upper roller and a lower roller, the upper roller and the lower roller are connected through a first connecting piece, a containing cavity is formed between the upper roller and the lower roller, and liquid outlet holes communicated with the outside are formed in the periphery of the containing cavity; scribble liquid roller both ends and be provided with feed liquor pipe and drain pipe respectively, feed liquor pipe and drain pipe all extend to hold in the chamber and with hold the chamber intercommunication, are provided with the support frame on feed liquor pipe and the drain pipe.

Through adopting above-mentioned technical scheme, the structure that uses feed liquor pipe and drain pipe is arranged in carrying out the interpolation of passivation liquid in the holding tank, and the liquid level of passivation liquid is no longer than feed liquor pipe open-ended bottom usually, uses the structure of support frame to be used for carrying out the installation of feed liquor pipe and drain pipe, and passivation liquid through the feed liquor pipe interpolation passes through the drain hole and permeates to the cotton and sheathe in, and the cotton cover is with passivation liquid coating on the coil of strip.

The present invention in a preferred example may be further configured to: arc grooves corresponding in position are arranged at the positions, close to the end parts, of the upper half roller and the lower half roller, the first connecting piece comprises a metal strip arranged in the arc grooves, a connecting sleeve is arranged at one end of the metal strip, and a connecting block is arranged at the other end of the metal strip; a connecting groove matched with the connecting block is arranged in the connecting sleeve, a spring groove is formed in the side face of the connecting block, a spring block is movably mounted in the spring groove, a return spring is arranged in the spring groove, two ends of the return spring are respectively connected with the spring block and the groove bottom of the spring groove, the end part of the spring block extends to the outside of the spring groove, and a clamping groove matched with the spring block is formed in the side wall of the connecting groove; set up the slotted hole that communicates with the spring groove on the connecting block, be provided with the movable piece on the spring block, the movable piece passes slotted hole and extends to the connecting block outside.

By adopting the technical scheme, the liquid coating roller is arranged to be of the structure of the upper half roller and the lower half roller, the upper half roller and the lower half roller are respectively placed on the upper side and the lower side of the liquid inlet (outlet) pipe when in use, the metal strip is wound in the arc-shaped groove, the inner side of the metal strip is abutted against the bottom of the arc-shaped groove, the connecting block is sent into the connecting sleeve, the spring block is popped out from the spring groove and enters the clamping groove on the side face of the connecting sleeve, the connection between the two ends of the metal strip is realized, and the splicing between the upper half roller and the lower half roller is realized after the connecting block and the connecting sleeve are connected; the structure of a hole and the movable sheet is increased, the movable sheet is pulled to drive the spring block to move, the spring block is separated from the clamping groove, the separation between the connecting block and the connecting sleeve is realized, and the separation of the upper roller and the lower roller is realized.

The present invention in a preferred example may be further configured to: the cotton cloth sleeve is provided with cotton cloth layers connected at two sides, and the two sides of the cotton cloth layers are connected through a second connecting piece; the inner side of the cotton cloth sleeve is provided with a connecting strip arranged along the length direction of the cotton cloth sleeve, and the upper half roller and the lower half roller are both provided with strip-shaped grooves matched with the connecting strip; the inner side of the cotton cloth sleeve is also provided with a bulge, and the metal strip is provided with a notch corresponding to the position of the bulge.

Through adopting above-mentioned technical scheme, the structure both sides that use the cotton layer link to each other and have formed the cotton cover, and connecting strip and bar groove on the cotton layer cooperate, have realized becoming spacing to the cotton, when the liquid coating roller rotates, are difficult for appearing the relative rotation of cotton layer and liquid coating roller, have increased bellied structure and notch and have cooperated, have injectd the relative position of metal strip and cotton cover for mosaic structure is more stable.

The present invention in a preferred example may be further configured to: the connecting piece B is provided with a clamping hole matched with the clamping hook; magnet strip one and magnet strip two are inlayed respectively to the both sides of cotton layer interconnect.

By adopting the technical scheme, the structure of the connecting piece A and the connecting piece B is used as the connecting piece B, the hook is pulled to pull the tension spring, so that the hook is matched with the clamping hole, and the edges of two sides of the cotton cloth layer are connected through the tension spring; after the end part is fixed, the first magnet strip and the second magnet strip can be mutually attracted under the action of magnetic force, so that the connection is enhanced.

The present invention in a preferred example may be further configured to: the plane slope that two coating roller axis formed sets up, is provided with the layer board on the support frame, and the layer board extends and is located the below of coating roller to the direction that two support frames are close to each other, is provided with the collecting vat on the layer board, and layer board one side is provided with the extension board, and the extension board extends to the direction that is close to the coil of strip, is provided with the recess on the extension board, recess and collecting vat intercommunication and extend to the tip of extension board.

Through adopting above-mentioned technical scheme, increase the structure of layer board, the layer board is used for the bearing to follow some passivation liquid that the liquid roller tip fell when using, and the collecting vat will drip passivation liquid collect, sends into the both sides of coil of strip through the structure of extension board and recess, can utilize the passivation liquid that drips to coat the side of coil of strip.

The present invention in a preferred example may be further configured to: the extension plate is rotatably provided with a cotton cloth roller, and the bottom of the cotton cloth roller is positioned in the groove.

Through adopting above-mentioned technical scheme, increased the structure of link and cotton cloth roller, on the cotton cloth roller was sent into to the masking liquid roller that the recess will be collected, the side of cotton cloth roller and coil of strip offseted, also carries out once coating to the side of coil of strip.

The present invention in a preferred example may be further configured to: all be provided with the rubber circle on feed liquor pipe and the drain pipe, be provided with the screw thread sleeve pipe on the rubber circle, screw thread sleeve pipe and feed liquor pipe and drain pipe screw-thread fit, the rubber circle offsets with scribble liquid roller tip.

Through adopting above-mentioned technical scheme, the structure that has increased the rubber circle is used for carrying out the shutoff of scribbling liquid roller tip, has reduced the seepage of scribbling liquid roller tip liquid.

The present invention in a preferred example may be further configured to: a liquid storage tank is arranged below the liquid coating roller, an inclined plane is arranged at the bottom of the liquid storage tank, and the inclined plane is inclined upwards from the center to two ends.

Through adopting above-mentioned technical scheme, increased the structure of liquid reserve tank, unexpected passivation liquid from scribbling the liquid roller and drippage can enter into the liquid reserve tank and collect when using.

In summary, the invention includes at least one of the following beneficial technical effects:

when the galvanized steel coil is passivated, the hollow liquid coating roller is adopted to coat the passivation liquid on the steel coil, so that the passivating agent can be uniformly coated on the steel coil, the passivating agent is only required to be contained in the containing groove, a passivation pool is not required to be used for storing a large amount of passivating agent, meanwhile, the passivating agent attached to the steel coil is not excessive, and the possibility of pollution of the passivating agent is reduced;

the liquid coating roller is of a structure formed by splicing an upper half roller and a lower half roller, the upper half roller and the lower half roller can be installed and spliced through a first connecting piece, and a cotton cloth layer can be fixedly connected to the liquid coating roller through a second connecting piece;

the structure of layer board, collecting vat and cotton cloth roller has been increased, and the structure of passivation liquid in the recess is absorb to the cotton cloth roller for carry out the coating of passivation liquid to the both sides of coil of strip, promoted the coating effect, and utilize the effective use of passivation liquid.

Drawings

FIG. 1 is a schematic view of the passivation structure of a steel coil according to the present invention;

FIG. 2 is a schematic view of the interior of the applicator roll structure of the present invention;

FIG. 3 is a schematic view of a structure of the connector of the present invention;

FIG. 4 is a schematic view of the connection structure of the connection sleeve and the connection block in the present invention;

fig. 5 is an enlarged schematic view of a portion a of fig. 1.

Reference numerals: 1. a liquid coating roller; 10. an upper half roller; 11. a lower half roll; 12. an accommodating chamber; 13. a liquid outlet hole; 14. an arc-shaped slot; 15. a strip-shaped groove; 2. a support frame; 21. a liquid inlet pipe; 22. a liquid outlet pipe; 23. a rubber ring; 24. a threaded bushing; 3. a cotton cloth cover; 31. a cotton cloth layer; 32. a connecting strip; 33. a protrusion; 34. connecting a first sheet; 35. connecting a sheet B; 36. a tension spring; 37. a hook is clamped; 38. a first magnet strip; 39. a second magnet strip; 4. a liquid storage tank; 5. a support plate; 51. collecting tank; 52. an extension plate; 53. a groove; 54. a cotton cloth roller; 6. a first connecting piece; 61. a metal strip; 62. connecting sleeves; 63. connecting blocks; 64. a notch; 65. connecting grooves; 66. a spring slot; 67. a return spring; 68. a spring block; 69. a card slot; 7. a hole; 71. a movable plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

Referring to fig. 1, the production process of a high-strength galvanized steel coil disclosed by the invention comprises the following steps,

s1, uncoiling the steel coil, cutting and welding by using a seam welder;

s3, annealing the steel coil in the S2 to obtain an annealed steel coil;

s5, passivating the steel coil, namely, using two hollow and perforated liquid coating rollers 1 to contain passivation liquid, sleeving a cotton cloth sleeve 3 outside the liquid coating rollers 1, feeding the galvanized steel coil obtained in the step S4 into a hot air drying box to be heated and dried, then introducing the galvanized steel coil into the space between the liquid coating rollers 1, and enabling the passivation liquid to seep out of the liquid coating rollers 1 and be uniformly coated on the steel coil through the cotton cloth sleeve 3 to achieve passivation;

In the passivation process of carrying out scribbling liquid roller 1, used hollow scribble the structure of liquid roller 1, scribble liquid roller 1 and installed on support frame 2, support frame 2 is provided with two, and two equal vertical settings of support frame 2 are provided with liquid storage tank 4 between the 2 bottoms of support frame, and the shaping of liquid storage tank 4 bottom has the inclined plane of slope, and the incline direction on inclined plane is from the center to both ends tilt up.

Referring to fig. 2, the liquid coating roller 1 comprises an upper half roller 10 and a lower half roller 11, the upper half roller 10 is connected with the lower half roller 11 through a first connecting piece 6, a containing cavity 12 is formed between the upper half roller 10 and the lower half roller 11, and liquid outlet holes 13 communicated with the outside are formed in the periphery of the containing cavity 12. Scribble liquid roller 1 both ends and be connected with feed liquor pipe 21 and drain pipe 22 respectively, feed liquor pipe 21 and drain pipe 22 all extend to hold in the chamber 12 and with hold chamber 12 intercommunication, fixed mounting is on support frame 2 on feed liquor pipe 21 and the drain pipe 22. The liquid inlet pipe 21 and the liquid outlet pipe 22 are rotatably connected with the liquid coating roller 1 through ball bearings, passivation liquid is fed into the accommodating cavity 12 through the structures of the liquid inlet pipe 21 and the liquid outlet pipe 22, and the liquid level of the passivation liquid is usually positioned below the openings of the liquid inlet pipe 21 and the liquid outlet pipe 22. The cotton cloth sleeve 3 sleeved outside the liquid coating roller 1 is used for coating passivation liquid, the passivation liquid seeps out of the liquid outlet hole 13, and the coating on the steel coil is realized through the cotton cloth sleeve 3. All the cover is equipped with screw sleeve 24 on feed liquor pipe 21 and the drain pipe 22, and screw sleeve 24 and feed liquor pipe 21 and the equal screw-thread fit of drain pipe 22, screw sleeve 24 are connected with rubber circle 23, and rubber circle 23 covers and establishes in feed liquor pipe 21 and the outside of drain pipe 22, and rubber circle 23 offsets with scribble liquid roller 1 tip for the liquid in holding chamber 12 is difficult for oozing.

Referring to fig. 1, the plane slope that two scribble liquid roller 1 axes formed sets up, is provided with layer board 5 on the support frame 2, and layer board 5 extends and is located the below of scribbling liquid roller 1 to the direction that two support frames 2 are close to each other, is provided with collecting vat 51 on layer board 5, and layer board 5 one side is provided with extension board 52, and extension board 52 extends to the direction that is close to the coil of strip, and extension board 52 top has seted up recess 53, and recess 53 communicates with collecting vat 51 and extends to the tip of extension board 52. The extension plate 52 is rotatably provided with a cotton cloth roller 54, and the bottom of the cotton cloth roller 54 is positioned in the groove 53. The supporting plate 5 and the collecting groove 51 collect the passivating liquid dripped from the end part of the liquid coating roller 1, the passivating liquid enters the groove 53, and the cotton cloth roller 54 coats the side surface of the steel coil in the conveying process of the steel coil.

Referring to fig. 2, the positions of the upper half roller 10 and the lower half roller 11 near the ends are provided with arc-shaped grooves 14 corresponding to each other, and the arc-shaped grooves 14 of the upper half roller 10 and the lower half roller 11 are matched together to form a ring.

Referring to fig. 3 and 4, the first connecting member 6 includes a metal strip 61 installed in the arc-shaped groove 14, and a connecting sleeve 62 is fixedly connected to one end of the metal strip 61, and a connecting block 63 is fixed to the other end. The connecting sleeve 62 is internally provided with a connecting groove 65 matched with the connecting block 63, the side surface of the connecting block 63 is provided with a spring groove 66, and the length direction of the spring groove 66 is arranged along the width direction of the arc-shaped groove 14. A spring block 68 is movably mounted in the spring groove 66, a return spring 67 is mounted in the spring groove 66, two ends of the return spring 67 are respectively connected with the spring block 68 and the groove bottom of the spring groove 66, the end of the spring block 68 extends to the outside of the spring groove 66, and a clamping groove 69 matched with the spring block 68 is arranged on the side wall of the connecting groove 65. The connecting block 63 is provided with a hole 7 communicated with the spring groove 66, the spring block 68 is provided with a movable sheet 71, and the movable sheet 71 passes through the hole 7 and extends to the outside of the connecting block 63. The connection between the connecting block 63 and the connecting sleeve 62 is achieved by the connecting block 63 being fed into the clamping groove 69, because the inner sides of the metal strip 61 and the connecting groove 65 are in a tight state, which will bring the upper half-roll 10 and the lower half-roll 11 together. When the metal strip needs to be detached, the movable sheet 71 is slid to drive the spring block 68 to slide in the spring groove 66, so that the spring block 68 is separated from the clamping groove 69, the metal strip 61 is conveniently detached, and the upper half roller 10 and the lower half roller 11 are separated.

Referring to fig. 2 and 3, the cotton cloth cover 3 is a cotton cloth layer 31 connected end to end, and two sides of the cotton cloth layer 31 are connected by a second connecting piece. The inboard of cotton-padded jacket 3 is fixed with connecting strip 32 along its length direction, all takes shape on first roller 10 and the second roller 11 to have with connecting strip 32 complex bar groove 15 for difficult appearance and the relative rotation of scribbling liquid roller 1 after the cotton layer 31 connects. The inner side of the cotton cloth sleeve 3 is also provided with a bulge 33, and the metal strip 61 is provided with a notch 64 corresponding to the bulge 33. The engagement of the projections 33 and notches 64 limits the relative rotation between the sleeve 3 and the strip 61, making the connection more stable.

The second connecting piece comprises a first connecting piece 34 and a second connecting piece 35 which are fixed at the end part of the cotton layer 31, and the first connecting piece 34 and the second connecting piece 35 are respectively positioned at the edges of two sides of the cotton layer 31. A tension spring 36 is fixed on the connecting piece A34, a clamping hook 37 is formed at the end part of the tension spring 36, a clamping hole matched with the clamping hook 37 is formed in the connecting piece B35, and a first magnet strip 38 and a second magnet strip 39 are respectively embedded in two sides of the cotton layer 31 which are connected with each other. The hook 37 is pulled to enable the hook 37 and the snap hole to be matched with each other, and the second connecting piece plays a role in connection under the elastic force of the tension spring 36. After the first magnet strip 38 and the second magnet strip 39 are matched with each other, the connection between the two sides of the cotton layer 31 is further realized.

The implementation principle of the embodiment is as follows: degreasing the steel coil before galvanization, then sending the steel coil into a high-temperature zinc pot for galvanization of the steel coil to form a galvanized steel coil, and then blowing by using an air knife to improve the uniform distribution of a zinc layer so that the formed galvanized steel coil has uniform thickness and the zinc layer can form more stable protection on the galvanized steel coil; passivation treatment and oil coating are carried out, and a layer of protective film can be provided for the steel coil.

When passivation is carried out, the steel coil passes through the space between the two liquid coating rollers 1, and passivation liquid in the liquid coating rollers 1 permeates into the cotton cloth layer 31 and is uniformly coated on the steel coil. And as long as the passivating agent exists in the accommodating tank, a passivating pool is not needed for storing a large amount of passivating agent, and meanwhile, the passivating agent attached to the steel coil is not excessive, so that the possibility of passivating agent pollution is reduced.

The embodiments of the present invention are preferred embodiments of the present invention, and the scope of the present invention is not limited by these embodiments, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.

Claims

1. A production process of a high-strength galvanized steel coil is characterized by comprising the following steps: the method comprises the following steps:

s1, uncoiling the steel coil, cutting and welding by using a seam welder;

s3, annealing the steel coil in the S2;

s5, passivating the steel coil, namely, using two hollow liquid coating rollers (1) with holes to contain passivation liquid, sleeving a cotton cloth sleeve (3) outside the liquid coating rollers (1), feeding the galvanized steel coil obtained in the step S4 into a hot air drying box for heating and drying, then feeding the galvanized steel coil into the space between the liquid coating rollers (1), and enabling the passivation liquid to seep out of the liquid coating rollers (1) and be uniformly coated on the steel coil through the cotton cloth sleeve (3) to achieve passivation;

2. The production process of the high-strength galvanized steel coil as claimed in claim 1, characterized in that: the liquid coating roller (1) comprises an upper half roller (10) and a lower half roller (11), the upper half roller (10) and the lower half roller (11) are connected through a first connecting piece (6), a containing cavity (12) is formed between the upper half roller (10) and the lower half roller (11), and liquid outlet holes (13) communicated with the outside are formed in the periphery of the containing cavity (12); scribble liquid roller (1) both ends and be provided with feed liquor pipe (21) and drain pipe (22) respectively, feed liquor pipe (21) and drain pipe (22) all extend to hold in chamber (12) and with hold chamber (12) intercommunication, are provided with support frame (2) on feed liquor pipe (21) and drain pipe (22).

3. The production process of the high-strength galvanized steel coil as claimed in claim 2, characterized in that: arc-shaped grooves (14) corresponding to the positions of the upper half roller (10) and the lower half roller (11) close to the end parts are formed in the positions, the first connecting piece (6) comprises a metal strip (61) arranged in the arc-shaped grooves (14), one end of the metal strip (61) is provided with a connecting sleeve (62), and the other end of the metal strip is provided with a connecting block (63); a connecting groove (65) matched with the connecting block (63) is arranged in the connecting sleeve (62), a spring groove (66) is arranged on the side face of the connecting block (63), a spring block (68) is movably arranged in the spring groove (66), a return spring (67) is arranged in the spring groove (66), two ends of the return spring (67) are respectively connected with the spring block (68) and the groove bottom of the spring groove (66), the end part of the spring block (68) extends to the outside of the spring groove (66), and a clamping groove (69) matched with the spring block (68) is arranged on the side wall of the connecting groove (65); a hole (7) communicated with the spring groove (66) is formed in the connecting block (63), a movable sheet (71) is arranged on the spring block (68), and the movable sheet (71) penetrates through the hole (7) and extends to the outside of the connecting block (63).

4. The production process of the high-strength galvanized steel coil as claimed in claim 3, characterized in that: the cotton cloth sleeve (3) is provided with a cotton cloth layer (31) with two sides connected, and the two sides of the cotton cloth layer (31) are connected through a second connecting piece; the inner side of the cotton cloth sleeve (3) is provided with a connecting strip (32) arranged along the length direction of the cotton cloth sleeve, and the upper half roller (10) and the lower half roller (11) are both provided with strip-shaped grooves (15) matched with the connecting strip (32); the inner side of the cotton cloth sleeve (3) is also provided with a bulge (33), and the metal strip (61) is provided with a notch (64) corresponding to the bulge (33).

5. The production process of the high-strength galvanized steel coil as claimed in claim 4, characterized in that: the connecting piece II comprises a connecting piece A (34) and a connecting piece B (35) which are respectively arranged on the edge of the end part of the cotton cloth layer (31), a tension spring (36) is fixed on the connecting piece A (34), a clamping hook (37) is arranged on the end part of the tension spring (36), and a clamping hole matched with the clamping hook (37) is arranged on the connecting piece B (35); the two sides of the cotton layer (31) which are connected with each other are respectively embedded with a first magnet strip (38) and a second magnet strip (39).

6. The production process of the high-strength galvanized steel coil as claimed in claim 2, characterized in that: plane slope that two coating liquid roller (1) axes formed sets up, be provided with layer board (5) on support frame (2), layer board (5) extend and are located the below of coating liquid roller (1) to the direction that two support frames (2) are close to each other, be provided with collecting vat (51) on layer board (5), layer board (5) one side is provided with extension board (52), extension board (52) extend to the direction that is close to the coil of strip, be provided with recess (53) on extension board (52), recess (53) communicate with collecting vat (51) and extend to the tip of extension board (52).

7. The production process of the high-strength galvanized steel coil as claimed in claim 6, characterized in that: the extension plate (52) is rotatably provided with a cotton cloth roller (54), and the bottom of the cotton cloth roller (54) is positioned in the groove (53).

8. The production process of the high-strength galvanized steel coil as claimed in claim 2, characterized in that: all be provided with rubber circle (23) on feed liquor pipe (21) and drain pipe (22) and be connected with screw sleeve pipe (24), screw sleeve pipe (24) and feed liquor pipe (21) and drain pipe (22) screw-thread fit, rubber circle (23) and scribble liquid roller (1) tip and offset.

9. The production process of the high-strength galvanized steel coil as claimed in claim 1, characterized in that: a liquid storage tank (4) is arranged below the liquid coating roller (1), an inclined plane is arranged at the bottom of the liquid storage tank (4), and the inclined plane is inclined upwards from the center to two ends.