Pretreatment device of strip steel heat treatment furnace

Abstract

A pretreatment device of a strip steel heat treatment furnace belongs to the technical field of strip steel processing equipment, is located at an inlet of the heat treatment furnace and comprises a bearing frame, a first clamping roller and a second clamping roller are rotatably arranged at the input end and the output end of the bearing frame respectively, and a plurality of conveying rollers are evenly arranged between the first clamping roller and the second clamping roller. A first limiting plate and a second limiting plate are arranged on the two sides of the bearing frame correspondingly, and a conveying channel with a contraction part, a maintaining part and an expansion part is formed between the first limiting plate and the second limiting plate; the width of the shrinking part is gradually shrunk to 90% of the width of the strip steel in the conveying direction of the conveying roller, the width of the maintaining part is equal to the minimum width of the shrinking part, the maintaining part is communicated with the shrinking part, the width of the expanding part is gradually expanded in the conveying direction of the conveying roller, and the maximum width is not smaller than the width of the strip steel; a cleaning device with a spray head is arranged above the contraction part; the pretreatment device improves the surface quality of the strip steel entering the heat treatment furnace.

Description

Technical Field

[0001] This utility model relates to the technical field of strip steel processing equipment, specifically a pretreatment device for a strip steel heat treatment furnace. Background Technology

[0002] Steel strip, also known as steel strip, is a narrow and long steel plate produced by steel rolling mills to meet the needs of various industrial sectors for the industrialized production of various metal or mechanical products. Before heat treatment, cold-rolled steel strip often needs to undergo pickling and alkali washing processes to remove oxide scale and lubricants used during rolling and straightening in the cold rolling process, and then it is sent to a heat treatment furnace for annealing.

[0003] However, in actual production, due to reasons such as incomplete pickling or alkaline washing, incomplete cleaning of pickling solution, and the presence of hydrocarbon impurities in the protective gas used in the heat treatment furnace, residues appear on the surface of the heat-treated strip steel, affecting the surface quality of the strip steel. Utility Model Content

[0004] To address the issue of residues appearing on the surface of strip steel after heat treatment in existing technologies, this invention provides a pretreatment device for a strip steel heat treatment furnace, which improves the surface quality of the strip steel by removing these residues.

[0005] To achieve the above objectives, the specific solution adopted by this utility model is as follows: a pretreatment device for a strip steel heat treatment furnace, located at the entrance of the heat treatment furnace, includes a support frame, a first clamping roller rotatably mounted at the input end of the support frame, and a second clamping roller rotatably mounted at the output end of the support frame. Multiple conveying rollers rotatably connected to the support frame are evenly arranged between the first and second clamping rollers. A first limiting plate and a second limiting plate are respectively provided on both sides of the support frame, forming a conveying channel extending along the strip steel conveying direction. The conveying channel includes a contraction section, a holding section, and an expansion section. The width of the contraction section gradually contracts to 90% of the strip steel width along the conveying direction of the conveying rollers. The width of the holding section is equal to the minimum width of the contraction section, and the holding section is connected to the contraction section. The width of the expansion section gradually expands along the conveying direction of the conveying rollers, and its maximum width is not less than the strip steel width. A cleaning device fixedly connected to the support frame is provided above the contraction section. The cleaning device includes multiple nozzles spraying water towards the strip steel surface. An air jet device fixedly connected to the support frame is provided above the holding section. The air jet device includes multiple air jets for blowing away moisture from the strip steel surface.

[0006] As an optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: the expansion section is arranged in the heating chamber, and the heating chamber is connected to the inlet of the heat treatment furnace.

[0007] As another optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: a sealing plate is provided on the side of the heating chamber away from the heat treatment furnace, and a long through hole for the strip steel to pass through is formed between the bottom end of the sealing plate and the conveying channel.

[0008] As another optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: a heating device is provided in the heating chamber; the heating device is an electric heating wire, an infrared radiation tube or an electromagnetic induction heating component.

[0009] As another optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: the heating chamber is provided with a gas guide pipe connected to it, and a gas pump is provided at the end of the gas guide pipe away from the heating chamber; the air inlet of the gas pump is connected to the gas guide pipe, and the air outlet of the gas pump is connected to multiple jet heads.

[0010] As another optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: multiple nozzles are all connected to water inlet pipes, and multiple nozzles oscillate back and forth along the axial direction of the conveyor roller.

[0011] As another optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: multiple jet heads are evenly distributed in two rows along the axial direction of the conveyor rollers and are in an inverted V shape.

[0012] As another optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: the two sides of the conveying roller are coaxially provided with annular grooves, the bottoms of the first limiting plate and the second limiting plate are both located in the annular grooves, and the bottoms of the first limiting plate and the second limiting plate are not higher than the bottom of the conveying channel.

[0013] As another optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: both the first limiting plate and the second limiting plate are fixedly connected to the support frame by a fixing rod.

[0014] As another optimized solution for the pretreatment device of the above-mentioned strip heat treatment furnace: the center of the conveyor roller with a length equal to the width of the strip within the shrinkage section is provided with an annular protrusion; and at least one conveyor roller adjacent to the conveyor roller is also provided with an annular protrusion at its center, and the line connecting the annular protrusions on all the conveyor rollers is in the same direction as the strip conveying.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1) This utility model provides a pretreatment device for a strip steel heat treatment furnace. Before the strip steel enters the heat treatment furnace, the surface of the strip steel is made into an upward-convex arc surface by the constraint of the first limiting plate and the first limiting plate. Then, water is sprayed by the nozzle to wash away the residue on the surface of the strip steel. The water left on the surface of the strip steel is blown away by the air jet nozzle, which improves the surface quality of the strip steel after entering the heat treatment furnace.

[0017] 2) In this utility model, the two sides of the conveying roller are coaxially provided with annular grooves, and the bottoms of the first limiting plate and the second limiting plate are both located in the annular grooves to prevent the strip steel from shifting out of the conveying channel during the conveying process.

[0018] 3) In this utility model, multiple nozzles swing back and forth along the axial direction of the conveyor roller to avoid spraying water at the same position of the strip and increase the width of the strip cleaning. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the pretreatment device for the strip steel heat treatment furnace;

[0020] Figure 2 This is a top view of the transmission channel;

[0021] Figure 3 This is a cross-sectional view of the first side plate within the annular groove;

[0022] Reference numerals: 1. Support frame; 2. First clamping roller; 3. Second clamping roller; 4. Conveying roller; 5. First limiting plate; 6. Second limiting plate; 7. Conveying channel; 701. Contraction section; 702. Holding section; 703. Expansion section; 8. Cleaning device; 801. Nozzle; 802. Water inlet pipe; 9. Heating chamber; 10. Heat treatment furnace; 11. Heating device; 12. Sealing plate; 13. Air jet device; 1301. Air jet head; 1302. Air guide pipe; 14. Fixing rod; 15. Annular groove; 16. Long through hole; 17. Air pump. Detailed Implementation

[0023] The technical solution of this utility model will be further described in detail below with reference to specific embodiments. Parts not described or disclosed in detail in the following embodiments of this utility model should be understood as prior art known or should be known by those skilled in the art.

[0024] Example 1

[0025] like Figure 1 , Figure 2 As shown, a pretreatment device for a strip steel heat treatment furnace is located at the entrance of the furnace 10. It includes a support frame 1. A first clamping roller 2 is rotatably mounted on the input end of the support frame 1 to clamp the input end of the strip steel, ensuring stable entry into the device. A second clamping roller 3 is rotatably mounted on the output end of the support frame 1 to clamp the output end of the strip steel, allowing it to smoothly exit the device and enter the heat treatment furnace 10. Multiple conveying rollers 4, rotatably connected to the support frame 1, are evenly arranged between the first clamping roller 2 and the second clamping roller 3, with a certain gap between adjacent conveying rollers 4. The conveying rollers 4 support and convey the strip steel, allowing it to move smoothly within the device.

[0026] The support frame 1 is provided with a first limiting plate 5 and a second limiting plate 6 on both sides. The first limiting plate 5 and the second limiting plate 6 are fixedly connected to the support frame 1 by a fixing rod 14. In this utility model, there are several fixing rods 14. The fixing rods 14 can prevent the first limiting plate 5 or the second limiting plate 6 from shifting, and ensure the stability of the conveying channel 7.

[0027] The first limiting plate 5 and the second limiting plate 6 form a conveying channel 7 extending along the strip conveying direction. The conveying channel 7 includes a contraction section 701, a holding section 702, and an expansion section 703. The width of the contraction section 701 gradually contracts to 90% of the strip width along the conveying direction of the conveying roller 4. The strip is constrained by the contraction section 701, and the surface of the strip gradually bulges upward or downward to facilitate subsequent processing operations. A ring-shaped protrusion is provided at the center of the conveying roller 4, which is located within the contraction section 701 and has a length equal to the strip width. The ring-shaped protrusion can prevent the surface of the strip from bulging downward. Furthermore, at least one conveying roller 4 adjacent to this conveying roller 4 also has a ring-shaped protrusion at its center, and the line connecting the ring-shaped protrusions on all the conveying rollers 4 is in the same direction as the strip conveying direction. In this utility model, the number of conveying rollers 4 with ring-shaped protrusions is three, and the gap width between two adjacent conveying rollers 4 is not less than twice the thickness of the ring-shaped protrusion.

[0028] The width of the maintaining part 702 is equal to the minimum width of the shrinking part 701, and the maintaining part 702 and the shrinking part 701 are connected. The maintaining part 702 can make the strip steel be smoothly conveyed in the adjusted state and prevent the strip steel from gradually returning to its original state during the conveying process. The width of the expanding part 703 is kept to gradually expand along the conveying direction of the conveying roller 4 and the maximum width is not less than the width of the strip steel. This allows the strip steel to return to its original state before entering the heat treatment furnace 10.

[0029] A cleaning device 8, fixedly connected to the support frame 1, is provided above the contraction section 701. The cleaning device 8 includes multiple nozzles 801 that spray water toward the surface of the strip steel. The nozzles 801 spray water onto the surface of the strip steel to clean the residue on the surface of the strip steel, ensuring that the surface of the strip steel is clean before entering the heat treatment furnace 10. All nozzles 801 are connected to a water inlet pipe 802, which connects the nozzles 801 to an external water source. Furthermore, the nozzles 801 reciprocate along the axial direction of the conveyor roller 4. In this invention, all nozzles 801 are hinged to the body of the cleaning device 8 and also hinged to a connecting rod. The connecting rod is fixedly connected to an electric push rod. By pushing and pulling the electric push rod, the connecting rod moves left and right, and the nozzles 801 reciprocate. This allows the water sprayed from the nozzles 801 to more comprehensively cover the surface of the strip steel, thereby more effectively cleaning the residue on the surface of the strip steel.

[0030] Above the holding section 702, an air jet device 13 is fixedly connected to the support frame 1. The air jet device 13 includes multiple air jet heads 1301 for blowing away moisture from the strip surface, causing the moisture on the strip surface to evaporate quickly, thereby reducing moisture residue on the strip surface. The multiple air jet heads 1301 are evenly distributed in two rows along the axial direction of the conveyor roller 4 in an inverted V shape; this distribution allows the air jet heads 1301 to blow away moisture from the strip surface more evenly.

[0031] The above are the basic embodiments of this utility model. Further improvements, optimizations, and limitations can be made based on the above to obtain the following embodiments:

[0032] Example 2

[0033] This embodiment is an improvement on embodiment 1. Its main structure is the same as that of embodiment 1, but the improvement lies in:

[0034] like Figure 1 , Figure 2 As shown, the expansion section 703 is disposed within the heating chamber 9, which is connected to the inlet of the heat treatment furnace 10. The heating chamber 9 preheats the strip steel, ensuring it reaches a certain temperature before entering the heat treatment furnace 10, thereby improving the efficiency of the heat treatment. A sealing plate 12 is provided on the side of the heating chamber 9 away from the heat treatment furnace 10 to prevent heat loss from the heating chamber 9. A long through hole 16 for the strip steel to pass through is formed between the bottom end of the sealing plate 12 and the conveying channel 7. A heating device 11 is disposed within the heating chamber 9; the heating device 11 is an electric heating wire, an infrared radiation tube, or an electromagnetic induction heating assembly.

[0035] The heating chamber 9 is provided with an air guide pipe 1302 connected to it. An air pump 17 is provided at the end of the air guide pipe 1302 away from the heating chamber 9. The air inlet of the air pump 17 is connected to the air guide pipe 1302, and the air outlet of the air pump 17 is connected to multiple jet nozzles 1301. The air pump 17 draws out the hot air in the heating chamber 9 and outputs it from the jet nozzles 1301. The hot air can better remove moisture from the surface of the strip steel.

[0036] Example 3

[0037] like Figure 3 As shown, the conveying roller 4 has an annular groove 15 coaxially arranged on both sides. The bottoms of the first limiting plate 5 and the second limiting plate 6 are both located in the annular groove 15, and the bottoms of the first limiting plate 5 and the second limiting plate 6 are not higher than the bottom of the conveying channel 7. This design can prevent the strip from shifting out from the bottom of the first limiting plate 5 or the second limiting plate 6 without being constrained by the conveying channel 7.

[0038] The working process of the pretreatment device of the strip heat treatment furnace 10 is as follows: In actual operation, the strip enters from the input end of the support frame 1, is first clamped by the first clamping roller 2, and then enters the conveying channel 7 under the support and conveying action of the conveying roller 4. In the contraction section 701, the width of the strip is gradually adjusted to an arc-shaped surface with an upward convexity in the middle. At the same time, the cleaning device 8 above the contraction section 701 sprays water onto the surface of the strip through the nozzle 801 to clean the residue on the surface of the strip. The residue flows to both sides of the strip with the water until it leaves the strip. The nozzle 801 swings back and forth along the axis of the conveying roller 4, so that the nozzle 801 can more comprehensively cover the surface of the strip, thereby cleaning the strip more effectively.

[0039] After cleaning, the strip enters the holding section 702. An air jet device 13 above the holding section 702 blows air onto the strip surface through an air jet head 1301, dispersing the moisture and allowing it to evaporate quickly, thus reducing residual moisture. The air jet head 1301 is connected to an air pump 17 via an air guide pipe 1302. The air pump 17 provides a stable air source to the air jet head 1301, ensuring that it can effectively disperse the moisture on the strip surface.

[0040] The strip steel enters the expansion section 703 through the elongated through-hole 16. The expansion section 703 is located inside the heating chamber 9. The heating device 11 inside the heating chamber 9 preheats the strip steel, ensuring it reaches a certain temperature before entering the heat treatment furnace 10, thereby improving the effect and efficiency of the heat treatment. The air pump 17 extracts gas from the heating chamber 9 through the air guide pipe 1302 to provide an air source for the jet nozzle 1301. The strip steel then enters the heat treatment furnace 10 from the heating chamber 9 for subsequent heat treatment operations.

[0041] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A pretreatment device of a strip steel heat treatment furnace, located at the inlet of the heat treatment furnace (10), comprising a carrier frame (1), a first clamping roller (2) is rotatably arranged at the input end of the carrier frame (1), a second clamping roller (3) is rotatably arranged at the output end of the carrier frame (1), a plurality of conveying rollers (4) are uniformly arranged between the first clamping roller (2) and the second clamping roller (3) and are rotatably connected with the carrier frame (1), characterized in that: The both sides of the bearing frame (1) are respectively provided with a first limiting plate (5) and a second limiting plate (6), the first limiting plate (5) and the second limiting plate (6) form a conveying channel (7) extending along the conveying direction of the strip steel between them, the conveying channel (7) comprises a contraction part (701), a maintaining part (702) and an expansion part (703); the width of the contraction part (701) gradually shrinks to 90% of the width of the strip steel along the conveying direction of the conveying roller (4), the width of the maintaining part (702) is equal to the minimum width of the contraction part (701), and the maintaining part (702) is communicated with the contraction part (701), the width of the expansion part (703) gradually expands along the conveying direction of the conveying roller (4) and the maximum width is not less than the width of the strip steel; a cleaning device (8) fixedly connected with the bearing frame (1) is arranged above the contraction part (701), the cleaning device (8) comprises a plurality of nozzles (801) for spraying water towards the surface of the strip steel; an air jet device (13) fixedly connected with the bearing frame (1) is arranged above the maintaining part (702), the air jet device (13) comprises a plurality of air jet heads (1301) for blowing away the moisture on the surface of the strip steel.

2. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 1, characterized in that: The expansion part (703) is arranged in a heating chamber (9), and the heating chamber (9) is communicated with the inlet of a heat treatment furnace (10).

3. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 2, characterized in that: A blocking plate (12) is arranged on the side of the heating chamber (9) away from the heat treatment furnace (10), and a long strip through hole (16) for the strip steel to pass through is formed between the bottom end of the blocking plate (12) and the conveying channel (7).

4. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 3, characterized in that: A heating device (11) is arranged in the heating chamber (9); the heating device (11) is an electric heating wire, an infrared radiation tube or an electromagnetic induction heating assembly.

5. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 4, characterized in that: An air guide pipe (1302) is arranged on the heating chamber (9) and communicated with the heating chamber (9), and an air pump (17) is arranged at the end of the air guide pipe (1302) away from the heating chamber (9); the air inlet hole of the air pump (17) is communicated with the air guide pipe (1302), and the air outlet hole of the air pump (17) is communicated with the plurality of air jet heads (1301).

6. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 1, characterized in that: The plurality of nozzles (801) are all communicated with a water inlet pipe (802), and the plurality of nozzles (801) swing reciprocatingly along the axial direction of the conveying roller (4).

7. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 1, characterized in that: The plurality of air jet heads (1301) are evenly distributed along the axial direction of the conveying roller (4) and form an inverted V shape.

8. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 1, characterized in that: Annular grooves (15) are coaxially arranged on the both sides of the conveying roller (4), the bottom of the first limiting plate (5) and the bottom of the second limiting plate (6) are both located in the annular grooves (15), and the bottom of the first limiting plate (5) and the bottom of the second limiting plate (6) are both not higher than the bottom of the conveying channel (7).

9. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 1, characterized in that: The first limiting plate (5) and the second limiting plate (6) are both fixedly connected with the bearing frame (1) through a fixing rod (14).

10. A pre-treatment device for a strip steel heat treatment furnace as claimed in claim 1, characterized in that: The center of the conveying roller (4) with a length equal to the width of the strip steel in the contraction part (701) is provided with an annular protrusion, and the center of at least one conveying roller (4) adjacent to the conveying roller (4) is also provided with an annular protrusion, and the connecting lines of the annular protrusions on all the conveying rollers (4) are the same as the conveying direction of the strip steel.

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