Heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip

Abstract

The present invention relates to a heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials, comprising a continuous heating and annealing furnace and a control system. In the continuous heating and annealing furnace, there are a feeding mechanism, a heating system, a cooling system and a discharging mechanism. At the inlet end of the continuous heating and annealing furnace, there is a pay-off mechanism, and at the outlet end, there is a reeling mechanism. It is characterized in that: an internal circulation synchronous transmission structure is provided in the process section of the continuous heating and annealing furnace. The internal circulation synchronous transmission structure is composed of a transmission mechanism and an internal circulation steel strip connected. The transmission mechanism drives the internal circulation transmission steel strip to synchronously pass through the heating system and the cooling system and continuously circulate, so that the internal circulation transmission steel strip supports and synchronously passes through the process section of the continuous heating and annealing furnace with the workpiece, forming a micro-tension type workpiece conveying and supporting structure; the control system controls the synchronous operation of the pay-off mechanism, the reeling mechanism and the internal circulation transmission structure, so that the running speed of the internal circulation transmission steel strip is the same as the advancing speed of the workpiece, forming a synchronous control structure. It has the characteristics and advantages of preventing the workpiece from being bent and broken and preventing the workpiece from sagging, etc.

Description

Technical Field

[0001] The present invention relates to a heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials, which is applicable to continuous bright annealing heat treatment of ultra-thin metal strip materials. It belongs to the technical field of manufacturing machinery for heat treatment. Background Art

[0002] Ultra-thin metal strip materials generally refer to metal strips with a thickness ≤ 0.3 mm. The products can be used in industries such as aerospace insulation layers, electronic precision components, automotive three-way catalysts, and lithium battery electrodes, and have a wide range of market applications.

[0003] Production practice has proved that after stainless steel is cold-rolled into a steel strip, the grains inside the steel strip will change. By continuously heating and annealing the strip through a continuous annealing furnace, the deformed grains can be re-transformed into uniform equiaxed grains, while eliminating work hardening and residual internal stress, and restoring the microstructure and properties of the steel strip to the heat treatment process quality before the cold-rolled deformation state.

[0004] The existing steel strip heat treatment equipment uses a continuous heating annealing furnace including a furnace body, a winding mechanism, and an unwinding mechanism. The winding mechanism is arranged at the workpiece inlet end of the furnace body, and the unwinding mechanism is arranged at the workpiece outlet end. Its working principle is: using the tension formed by the winding mechanism and the unwinding mechanism to drive the steel strip through the process section of the furnace body to achieve continuous heating and annealing, that is, the steel strip forms a steel strip tension through the winding, unwinding mechanisms and the tension mechanism, so that the steel strip passes through the middle of the furnace suspended, and the annealing process is realized. This requires that the steel strip has the strength to withstand a large tension when passing through the process section of the continuous heating annealing furnace. If the thickness of the steel strip is not enough, the steel strip is likely to bend or even be broken when heated under tension. Therefore, the existing heat treatment equipment is only applicable to steel strips with a thickness of more than 1 mm. Although someone has invented a method of using air support to make the steel strip pass through the heat treatment process section suspended, which can solve the problem of roller marks generated by roller transportation, there are still problems such as unstable air support causing the workpiece to sag in the process section of the heat treatment furnace and even touching the furnace bottom.

[0005] For example: The Chinese Patent Publication discloses:

[0006] The utility model patent with the name of "A continuous amorphous and nanocrystalline alloy strip tension annealing furnace" and the application number of "2021223052754" includes a tunnel furnace body, a traction assembly for traction of the strip, which is arranged at the front end of the furnace body; a feeding assembly for feeding the strip into the interior of the furnace body, which is arranged at the tail end of the furnace body; and a tension control assembly, which is arranged between the feeding assembly and the furnace body and is used to automatically adjust the tension of the strip during the annealing process of the strip. The utility model adjusts the speed difference between the traction assembly and the feeding assembly through the tension control assembly, and cooperates with the additional counterweight on the sliding seat to keep the tension of the strip at a constant value and run continuously, improving the stability of the tension during the continuous heat treatment of the strip. This patent needs to configure a special tension control assembly to cooperate with the additional counterweight on the sliding seat to keep the tension of the strip at a constant value. Therefore, it is only applicable to steel strips with a thickness of more than 1 mm and not applicable to metal strips with a thickness ≤ 0.3 mm.

[0007] The invention application with the name of "A method for improving intergranular corrosion of aluminum alloy thin plates" and the application number of "2021116558319" is a method for improving the intergranular corrosion of 5083H116 thin plates, mainly using a pneumatic continuous heat treatment furnace to heat-treat aluminum alloy strips. This invention mainly aims at the problem of unqualified intergranular corrosion during the stabilization treatment process of box furnaces. By using a pneumatic continuous heat treatment furnace to realize the continuous heat treatment of strips, the strips are rapidly heated and cooled in the furnace, and during the entire stabilization heat treatment process, the strips are uniformly heated and cooled. The strips are suspended by pneumatic pressure, and finally qualified products of 5083H116 with good performance are prepared, solving the problems of unstable intergranular corrosion, poor surface quality, low production efficiency, and high comprehensive cost. This invention needs to adjust the speed difference between the traction assembly and the feeding assembly through the tension control assembly. Therefore, it is only applicable to steel strips with a thickness of more than 1 mm and not applicable to metal strips with a thickness ≤ 0.3 mm.

[0008] The invention application with the name of "A heat treatment method for alloy steel strip" and the application number of "202211039424X" mainly uses high-temperature hot air to support the ultra-thin alloy steel strip instead of the transmission roller when the ultra-thin alloy steel strip enters the heating furnace for heat treatment. Thus, while the high-temperature hot air supports the ultra-thin alloy steel strip, it heats the ultra-thin alloy steel strip, and there will be no defects such as scratches and roller marks on the surface of the ultra-thin alloy strip. At the same time, inert gas is used as the high-temperature hot air to prevent the ultra-thin alloy steel strip from being oxidized while heating it, solving the problem that the ultra-thin alloy steel strip contacts and is pressed by the transmission roller in the furnace under its own gravity, which will form defects such as scratches and roller marks on the surface of the ultra-thin alloy strip and reduce the quality of the ultra-thin alloy steel strip. This invention needs to support the ultra-thin alloy steel strip by high-temperature hot air, and there are problems such as unstable hot air wind force, unstable support of the steel strip, the workpiece sagging or even touching the furnace bottom in the process section of the heat treatment furnace due to unstable wind force support, high noise and high energy consumption. In addition, because it is supported by wind force, the volume of the air box is limited and can only be used for the case where the process section of heat treatment is relatively short.

[0009] For metal strips (steel strips) with a thickness ≤ 0.3 mm, due to the low strength of the ultra-thin metal strip, it is extremely easy to be broken when heated under the existing technical tension conditions. Therefore, tension cannot be established, and when heated without tension conditions, it will sag at the bottom of the furnace, resulting in unqualified surface wear of the product. Therefore, when using the heat treatment method of a continuous annealing furnace in the prior art to continuously heat and anneal metal strips (steel strips) with a thickness ≤ 0.3 mm, there are the following problems: (1) It is easy to bend or even be broken when heated under the condition of bearing tension. (2) The workpiece will sag at the bottom of the furnace when heated without tension conditions (such as hot air support), resulting in unqualified surface wear of the product.

[0010] Although in existing heat treatment equipment, the use of a conveyor belt can transport an ultra-thin steel strip (workpiece) to overcome the defect that the workpiece will sag at the bottom of the furnace when heated under the condition of no tension (for example: hot air support), during the process of transporting the workpiece, it is necessary to use pressure rollers to press the workpiece against the conveyor belt and then transport it into the heat treatment furnace (box). For example, the Chinese patent announcement discloses: a utility model patent with the name "A Steel Strip Heat Treatment Equipment" and the patent number "2021223545291", which includes a conveyor belt and a heat treatment box. Along the length direction inside the heat treatment box, there is a heating channel, and the conveyor belt passes through the heating channel. At the feeding port of the heat treatment box, there is a pressing assembly, which includes at least one first pressing roller and at least one second pressing roller. The first pressing roller and the second pressing roller are arranged at intervals. The first pressing roller is arranged above the conveyor belt, and the second pressing roller is arranged below the conveyor belt. The lowest point of the first pressing roller is lower than the highest point of the second pressing roller. This utility model patent mainly sets the first pressing roller and the second pressing roller at the feeding port of the heat treatment box to tightly press the steel strip on the conveyor belt. When the conveyor belt rotates, the steel strip is driven into the heat treatment box for heat treatment through friction. The main problems existing in this utility model are: it is easy to produce roller marks and indentations, which affect the product quality. Summary of the Invention

[0011] The purpose of the present invention is to solve the problems existing in the existing hot air support type heat treatment method, such as unstable wind support causing the workpiece to sag or even touch the furnace bottom in the process section of the heat treatment furnace, as well as high noise and high energy consumption, and the problems existing in the roller-pressed conveyor belt transmission, such as easy generation of roller marks and indentations, which affect the product quality. A heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials is provided. It has the characteristics of preventing the workpiece from being bent and broken, preventing the workpiece from sagging at the bottom of the furnace, preventing the surface of the workpiece from being worn, and preventing roller marks and indentations from being generated on the surface of the workpiece.

[0012] The purpose of the present invention can be achieved by adopting the following technical solutions:

[0013] The heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip includes a continuous heating and annealing furnace and a control system. In the continuous heating and annealing furnace, there are a feeding mechanism, a heating system, a cooling system, and a discharging mechanism. At the inlet end of the continuous heating and annealing furnace, there is an unwinding mechanism, and at the outlet end, there is a winding mechanism. Its structural characteristics are as follows: An internal circulation synchronous transmission structure is provided in the process section of the continuous heating and annealing furnace. The internal circulation synchronous transmission structure is composed of a transmission mechanism and an internal circulation transmission steel belt. The transmission mechanism drives the internal circulation transmission steel belt to synchronously pass through the heating system and the cooling system and continuously circulate, so that the internal circulation transmission steel belt supports and passes through the process section of the continuous heating and annealing furnace synchronously with the workpiece, forming a micro-tension workpiece conveying and supporting structure. The output end of the unwinding mechanism is connected to the input end of the internal circulation transmission structure, so that the workpiece passing through the process section of the continuous heating and annealing furnace is carried on the internal circulation transmission steel belt. The input end of the winding mechanism is connected to the output end of the internal circulation transmission structure. The control system has several signal input ends and several signal output ends. The signal output ends of the control system are connected to the control signal input ends of the heating system, the cooling system, the unwinding mechanism, the winding mechanism, and the internal circulation transmission structure. The control system controls the synchronous operation of the unwinding mechanism, the winding mechanism, and the internal circulation transmission structure, so that the running speed of the internal circulation transmission steel belt is the same as the advancing speed of the workpiece, forming a synchronous control structure. The signal input ends of the control system are connected to the signal output ends of the heating system, the cooling system, the unwinding mechanism, the winding mechanism, and the internal circulation transmission structure, forming a signal feedback structure. Thus, a processing production line for continuous heating and annealing of micro-tension ultra-thin strip with a closed-loop synchronous control structure is formed.

[0014] The object of the present invention can also be achieved by adopting the following technical solutions:

[0015] Further, a deviation rectifying device is provided in the winding mechanism. A series structure is formed by the deviation rectifying device, the winding unit, and the winding tension control unit. The deviation rectifying device is in the front, the winding tension control unit is in the middle, and the winding unit is at the back, forming a deviation rectifying winding mechanism.

[0016] Further, in the inner loop conveying structure, the driving mechanism is composed of a driving motor, two main drive shafts, and two secondary drive shafts. The two main drive shafts are arranged at both ends of the continuous annealing furnace, and their position heights are equivalent to those of the unwinding mechanism and the winding mechanism, so that the inner loop conveying steel belt can just support the workpiece. The two secondary drive shafts are respectively arranged on the inner sides below one main drive shaft, forming a four-point support structure. The inner loop conveying steel belt is connected to the four-point support structure to form an inner loop structure. The main drive shaft is connected to the output shaft of the driving motor, and the control input end of the driving motor is connected to a signal output end of the control system. A pressure sensor and a speed sensor are provided at the output shaft of the driving motor or on the main drive shaft. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system, forming a closed-loop control structure. The control system controls the rotation speed of the driving motor to synchronize the speed of the inner loop conveying steel belt with the forward speed of the workpiece.

[0017] Further, the unwinding mechanism is composed of an unwinding unit and an unwinding tension control unit connected in series. The unwinding unit is in the front, and the unwinding tension control unit is in the back. The workpiece is conveyed to the inner loop conveying steel belt through the unwinding tension control unit. The winding mechanism includes a winding unit and a winding tension control unit. The winding unit and the winding tension control unit form a series structure. The winding tension control unit is in the front, and the winding unit is in the back. After the workpiece is conveyed from the inner loop conveying steel belt to the input end of the winding tension control unit, the tension and speed are controlled by the winding tension control unit, and finally it enters the winding unit.

[0018] Further, the unwinding unit is composed of an unwinding motor and an unwinding roller. A pressure sensor and a speed sensor are provided at the output shaft of the unwinding roller or the unwinding motor. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the unwinding motor, forming a closed-loop unwinding control structure. The unwinding tension control unit is composed of an unwinding tension motor and three unwinding tension rollers. The three unwinding tension rollers are arranged in a triangle to form a three-stage straightening and adjustment structure. A pressure sensor and a speed sensor are provided at the output shaft of the unwinding tension motor or on one of the unwinding tension rollers. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the unwinding tension motor, forming a closed-loop unwinding tension control structure.

[0019] Further, the coiling unit consists of a coiling motor and a coiling roller. A pressure sensor and a speed sensor are arranged at the output shaft of the coiling roller or the coiling motor. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the coiling motor, forming a closed-loop coiling control structure; the coiling tension control unit consists of a coiling tension motor and four coiling tension rollers. The four coiling tension rollers are arranged in an "S" shape, forming a four-stage straightening and adjusting structure; a pressure sensor and a speed sensor are arranged at the output shaft of the coiling tension motor or at one of the coiling tension rollers. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the coiling tension motor, forming a closed-loop coiling tension control structure; the control system controls the rotation speeds of the coiling tension motor and the coiling motor, so that the linear speeds of the coiling tension rollers and the coiling roller are synchronized with the speed of the inner circulation conveyor steel belt 8 and the forward speed of the workpiece.

[0020] The present invention has the following characteristics:

[0021] 1. Since the inner circulation synchronous conveying structure is provided in the process section of the continuous heating annealing furnace in the present invention, the inner circulation synchronous conveying structure is composed of a transmission mechanism and an inner circulation conveyor steel belt connected together. The transmission mechanism drives the inner circulation conveyor steel belt to synchronously pass through the heating system and the cooling system and continuously circulate, so that the inner circulation conveyor steel belt supports and synchronously passes through the process section of the continuous heating annealing furnace with the workpiece, forming a micro-tension type workpiece conveying and supporting structure; the output end of the uncoiling mechanism is communicated with the input end of the inner circulation conveying structure, so that the workpiece passing through the process section of the continuous heating annealing furnace is carried on the inner circulation conveyor steel belt, and the input end of the coiling mechanism is communicated with the output end of the inner circulation conveying structure; the control system has several signal input ends and several signal output ends. The signal output end of the control system is connected to the control signal input ends of the heating system, the cooling system, the uncoiling mechanism, the coiling mechanism and the inner circulation conveying structure. The control system controls the synchronous operation of the uncoiling mechanism, the coiling mechanism and the inner circulation conveying structure, so that the running speed of the inner circulation conveyor steel belt is the same as the forward speed of the workpiece, forming a synchronous control structure; the signal input end of the control system is connected to the signal output ends of the heating system, the cooling system, the uncoiling mechanism, the coiling mechanism and the inner circulation conveying structure, forming a signal feedback structure; thus, a processing production line for continuous heating annealing of micro-tension ultra-thin strip materials with a closed-loop synchronous control structure is formed. Therefore, it can solve the problems existing in the existing hot air supporting type heat treatment method, such as unstable wind support causing the workpiece to sag or even touch the furnace bottom in the process section of the heat treatment furnace, high noise and high energy consumption, and the problems existing in the roller press type conveyor belt transmission, such as easy generation of roller marks and indentations, which affect the product quality. It has the characteristics of preventing the workpiece from being bent and broken, preventing the workpiece from sagging at the bottom of the furnace, preventing the surface of the workpiece from being worn, and preventing roller marks and indentations from being generated on the surface of the workpiece.

[0022] 2. The main feature that differentiates the present invention from the existing mesh belt conveying structure is that through a synchronous control structure, the unwinding mechanism, winding mechanism, and internal circulation conveying structure are controlled to operate synchronously, so that the running speed of the internal circulation conveying steel belt is the same as the advancing speed of the workpiece, forming a synchronous running internal circulation workpiece conveying and supporting structure. There is no need to set up a roll pressing mechanism at the inlet and outlet ends of the heat treatment furnace, avoiding roll marks and indentations on the workpiece. The main feature that differentiates it from the existing hot air type workpiece supporting and conveying structure is that it avoids problems such as the workpiece sagging or even touching the furnace bottom in the process section of the heat treatment furnace due to unstable wind support and high noise and energy consumption caused by the need for additional air blowing. It has the characteristics of preventing the workpiece from being bent and broken, preventing the workpiece from sagging at the bottom of the furnace, preventing wear on the surface of the workpiece, preventing roll marks and indentations on the surface of the workpiece, being noise-free, and saving energy.

[0023] 3. Since a deviation rectifying device is provided in the winding mechanism of the invention, a series structure is formed by the deviation rectifying device, winding tension control unit, and winding unit, with the deviation rectifying device at the front, the winding tension control unit in the middle, and the winding unit at the back, forming a deviation rectifying type winding mechanism. Therefore, it can correct the deviation of the workpiece (thin belt) before entering the winding tension control unit, ensure accurate tension control during winding, and make the workpiece (thin belt) more neatly and firmly wound after winding. It has the characteristics of accurate product winding control, good product winding quality, and high efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a front view structural schematic diagram of Specific Embodiment 1 of the present invention.

[0025] Figure 2 It is a sectional view structural schematic diagram of Specific Embodiment 1 of the present invention.

[0026] Figure 3 It is a top view structural schematic diagram of Specific Embodiment 1 of the present invention.

[0027] Figure 4 It is a three-dimensional structural schematic diagram of Specific Embodiment 1 of the present invention.

[0028] Figure 5 It is a structural schematic diagram of the unwinding mechanism and winding mechanism of Specific Embodiment 1 of the present invention.

[0029] Figure 6 It is a structural schematic diagram of the winding mechanism of Specific Embodiment 1 of the present invention.

[0030] Figure 7 It is a schematic diagram of the heat treatment effect of Specific Embodiment 1 of the present invention.

[0031] Figure 8 It is a schematic diagram of the heat treatment effect of the prior art. DETAILED DESCRIPTION OF THE EMBODIMENTS Specific Embodiment 1:

[0033] Referring to Figures 1 to 4 , the heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip in this embodiment includes a continuous heating and annealing furnace and a control system 13. In the continuous heating and annealing furnace 20, there are a feeding mechanism 3, a heating system 4, a cooling system 5, and a discharging mechanism 6. At the inlet end of the continuous heating and annealing furnace 20, there is an unwinding mechanism, and at the outlet end, there is a winding mechanism; in the process section of the continuous heating and annealing furnace 20, there is an internal circulation synchronous transmission structure, which is composed of a transmission mechanism 7 and an internal circulation transmission steel belt 8 connected. The transmission mechanism 7 drives the internal circulation transmission steel belt 8 to synchronously pass through the heating system 4 and the cooling system 5 and continuously circulate, so that the internal circulation transmission steel belt 8 supports and passes through the process section of the continuous heating and annealing furnace synchronously with the workpiece, forming a micro-tension type workpiece conveying and supporting structure; the output end of the unwinding mechanism is connected to the input end of the internal circulation transmission structure, so that the workpiece passing through the process section of the continuous heating and annealing furnace is carried on the internal circulation transmission steel belt 8, and the input end of the winding mechanism is connected to the output end of the internal circulation transmission structure; the control system 13 has several signal input ends and several signal output ends. The signal output ends of the control system 13 are connected to the control signal input ends of the heating system 4, the cooling system 5, the unwinding mechanism, the winding mechanism, and the internal circulation transmission structure. The control system 13 controls the synchronous operation of the unwinding mechanism, the winding mechanism, and the internal circulation transmission structure, so that the running speed of the internal circulation transmission steel belt 8 is the same as the forward speed of the workpiece, forming a synchronous control structure; the signal input ends of the control system 13 are connected to the signal output ends of the heating system 4, the cooling system 5, the unwinding mechanism, the winding mechanism, and the internal circulation transmission structure, forming a signal feedback structure; thus, a processing production line for continuous heating and annealing of micro-tension ultra-thin strip with a closed-loop synchronous control structure is formed.

[0034] In this embodiment:

[0035] A deviation rectifying device 10 is arranged in the winding mechanism. A series structure is formed by the deviation rectifying device 10, the winding unit 12, and the winding tension control unit 11. The deviation rectifying device 10 is in the front, the winding tension control unit 11 is in the middle, and the winding unit 12 is in the back, forming a deviation rectifying type winding mechanism.

[0036] The deviation rectifying device 10 is composed of two groups of rollers 10-1 arranged at high and low positions. The deviation rectifying device constitutes a deviation rectifying control adjustment system, which is composed of a deviation rectifying adjustment roller and a deviation rectifying guide roller. A strip position detector is installed between the two rollers, and an offset electric cylinder is installed on the deviation rectifying adjustment roller, which can control the angle of the deviation rectifying adjustment roller.

[0037] In the internal circulation conveying structure, the transmission mechanism 7 is composed of a transmission motor, two main transmission shafts 7-1 and two secondary transmission shafts 7-2. The main transmission shafts 7-1 and the secondary transmission shafts 7-2 form a turning roller. The two main transmission shafts 7-1 are arranged at both ends of the continuous annealing furnace, and their position heights are equivalent to those of the unwinding mechanism and the winding mechanism, so that the internal circulation conveying steel belt 8 can just support the workpiece. The two secondary transmission shafts 7-2 are respectively arranged inside and below one of the main transmission shafts 7-1 to form a four-point support structure. The internal circulation conveying steel belt 8 is connected to the four-point support structure to form an internal circulation structure. The main transmission shaft 7-1 is connected to the output shaft of the transmission motor, and the control input end of the transmission motor is connected to a signal output end of the control system 13. A pressure sensor and a speed sensor are arranged at the output shaft of the transmission motor or on the main transmission shaft 7-1. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system 13 to form a closed-loop control structure. The control system 13 controls the rotation speed of the transmission motor so that the speed of the internal circulation conveying steel belt 8 is synchronized with the forward speed of the workpiece.

[0038] Refer to Figure 5 , the unwinding mechanism is composed of an unwinding unit 1 and an unwinding tension control unit 2 connected in series. The unwinding unit 1 is in the front and the unwinding tension control unit 2 is in the rear. The workpiece is conveyed to the internal circulation conveying steel belt 8 through the unwinding tension control unit 2. The winding mechanism includes a winding unit 12 and a winding tension control unit 11. The winding unit 12 and the winding tension control unit 11 form a series structure. The winding tension control unit 11 is in the front and the winding unit 12 is in the rear. After the workpiece is conveyed from the internal circulation conveying steel belt 8 to the input end of the winding tension control unit 11, the tension and speed are controlled by the winding tension control unit 11, and finally it enters the winding unit 12.

[0039] The unwinding unit 1 is composed of an unwinding motor and an unwinding roller 1-1. A pressure sensor and a speed sensor are arranged at the unwinding roller 1-1 or the output shaft of the unwinding motor. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system 13. A signal output end of the control system 13 is connected to the control signal input end of the unwinding motor to form a closed-loop unwinding control structure. The unwinding tension control unit 2 is composed of an unwinding tension motor 2-1 and three unwinding tension rollers 2-2. The three unwinding tension rollers 2-2 are arranged in a triangle to form a three-stage straightening and adjustment structure. A pressure sensor and a speed sensor are arranged at the output shaft of the unwinding tension motor 2-1 or at one of the unwinding tension rollers 2-2. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system 13. A signal output end of the control system 13 is connected to the control signal input end of the unwinding tension motor 2-1 to form a closed-loop unwinding tension control structure.

[0040] Refer to Figure 6, the coiling unit 12 consists of a coiling motor and a coiling roller 12-1. A pressure sensor and a speed sensor are arranged at the output shaft of the coiling roller 12-1 or the coiling motor. The electrical signal output terminals of the pressure sensor and the speed sensor are connected to a signal input terminal of the control system 13. A signal output terminal of the control system 13 is connected to the control signal input terminal of the coiling motor, forming a closed-loop coiling control structure; the coiling tension control unit 11 consists of a coiling tension motor 11-1 and four coiling tension rollers 11-2. The four coiling tension rollers 11-2 are arranged in an "S" shape, forming a four-stage straightening and adjusting structure; a pressure sensor and a speed sensor are arranged at the output shaft of the coiling tension motor 11-1 or at one of the coiling tension rollers 11-2. The electrical signal output terminals of the pressure sensor and the speed sensor are respectively connected to a signal input terminal of the control system 13. A signal output terminal of the control system 13 is connected to the control signal input terminal of the coiling tension motor 11-1, forming a closed-loop coiling tension control structure.

[0041] In this embodiment, the control system 13 can adopt a PLC control system of conventional technology and its common connection and control methods. The feeding mechanism 3 and the discharging mechanism 6 can adopt a roller transmission structure of conventional technology. The furnace body heating system 4 and the cooling system 5 can adopt a furnace body heating system 4 and a cooling system 5 for continuous heat treatment furnaces of conventional technology. The pressure sensor can adopt a pressure sensor of conventional technology, and the speed sensor can adopt a speed sensor of conventional technology. The uncoiling motor can adopt a servo motor of conventional technology, and the uncoiling roller 1-1 can adopt a roller of conventional technology; the uncoiling tension motor 2-1 can adopt a servo motor of conventional technology, and the uncoiling tension roller 2-2 can adopt a roller of conventional technology. The coiling motor can adopt a servo motor of conventional technology, and the coiling roller 12-1 can adopt a roller of conventional technology; the coiling tension motor 11-1 can adopt a servo motor of conventional technology, and the coiling tension roller 11-2 can adopt a roller of conventional technology. The driving motor can adopt a servo motor of conventional technology, and the two main transmission shafts 7-1 can adopt rollers of conventional technology. The deviation rectifying device 10 consists of two groups of rollers 10-1 arranged at high and low positions, and the rollers 10-1 can adopt rollers of conventional technology.

[0042] This embodiment has the following characteristics:

[0043] As an improvement of the technical solution, since the deviation rectifying device is arranged in the coiling mechanism in the present invention, a series structure is formed by the deviation rectifying device, the coiling tension control unit and the coiling unit. The deviation rectifying device is in the front, the coiling tension control unit is in the middle, and the coiling unit is in the back, forming a deviation rectifying coiling mechanism. Therefore, it can correct the deviation of the workpiece (thin strip) before entering the coiling tension control unit, ensure accurate coiling tension control and make the workpiece (thin strip) more neat and firm after coiling, with the characteristics of accurate product coiling control, good product coiling quality and high efficiency.

[0044] As an improvement of the technical solution, a pressure sensor and a speed sensor are arranged at the output shaft of the unwinding roller or the unwinding motor of the present invention. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the unwinding motor, forming a closed-loop unwinding control structure; the unwinding tension control unit consists of an unwinding tension motor and three unwinding tension rollers. The three unwinding tension rollers are arranged in a triangle, forming a three-stage straightening and adjustment structure; a pressure sensor and a speed sensor are arranged at the output shaft of the unwinding tension motor or at one of the unwinding tension rollers. The electrical signal output ends of the pressure sensor and the speed sensor are connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the unwinding tension motor, forming a closed-loop unwinding tension control structure. Therefore, it is possible to accurately control the speed and tension of the workpiece (thin strip) to be constant before the workpiece (thin strip) enters the process section of the continuous annealing furnace, ensure that the workpiece (thin strip) smoothly enters the inner-loop conveying steel belt in the process section, and passes through the process section of the continuous annealing furnace without tension or with micro-tension under the inner-loop conveying steel belt. It has the characteristics of accurate unwinding control of the workpiece (thin strip), good unwinding quality of the workpiece, and high efficiency.

[0045] As an improvement of the technical solution, a pressure sensor and a speed sensor are arranged at the output shaft of the winding roller and the winding motor of the present invention. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the winding motor, forming a closed-loop winding control structure; the winding tension control unit consists of a winding tension motor and four winding tension rollers. The four winding tension rollers are arranged in an "S" shape, forming a four-stage straightening and adjustment structure; a pressure sensor and a speed sensor are arranged at the output shaft of the winding tension motor or at one of the winding tension rollers. The electrical signal output ends of the pressure sensor and the speed sensor are connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the winding tension motor, forming a closed-loop winding tension control structure. Therefore, it is possible to accurately control the speed and tension of the workpiece (thin strip) to be constant before the workpiece (thin strip) enters the winding roller of the winding unit, ensure that the workpiece (thin strip) smoothly enters the winding roller of the winding unit, and has the characteristics of accurate winding control of the product (thin strip), good winding quality of the product workpiece, and high efficiency.

[0046] This embodiment is applicable to metal strips with a thickness ≤ 0.3 mm. The materials applicable to heat treatment include ultra-thin metal strips such as iron, stainless steel, copper, aluminum, and nickel. Specifications: thickness is 0.008 - 0.015 mm, width is 150 - 280 mm.

[0047] Refer to Figure 7, in this embodiment, when the ultra-thin strip passes through the continuous annealing furnace, the driving mechanism 7 drives the inner circulation conveyor steel strip 8 to synchronously pass through the heating system 4 and the cooling system 5 and continuously circulate, so that the inner circulation conveyor steel strip 8 supports and synchronously passes through the process section of the continuous annealing furnace with the workpiece, forming a micro-tension workpiece conveying and supporting structure, enabling the ultra-thin strip 9 to run synchronously on the inner circulation conveyor steel strip 8, solving the problem that the steel strip cannot establish a large tension, and ensuring the annealing quality of the ultra-thin strip. Solve the technical problems of continuous bright annealing heat treatment of ultra-thin metal strips. Refer to Figure 8 , in the unsupported conveying structure of the prior art (such as the hot air supporting structure), there is a problem that the workpiece sags or even touches the furnace bottom in the process section of the heat treatment furnace due to unstable wind support.

[0048] The working principle of this embodiment will be described in detail below with reference to the accompanying drawings:

[0049] Refer to Figures 1 to 6 , the uncoiling mechanism conveys the ultra-thin strip 9 (workpiece) to the feeding mechanism 3 of the continuous annealing furnace 20, and then synchronously conveys it into the continuous annealing furnace 20 through the inner circulation conveyor steel strip 8. After being heated by the heating system 4 and cooled by the cooling system 5 in the process section of the continuous annealing furnace 20, it is then synchronously conveyed to the discharging mechanism 6 by the inner circulation conveyor steel strip 8 to complete the heat treatment process of a section of the ultra-thin strip 9 (workpiece); the heat-treated workpiece section enters the coiling mechanism at the outlet end of the continuous annealing furnace 20, and the coiling mechanism synchronously coils the workpiece into a coil; the inner circulation conveyor steel strip 8 is in continuous operation, so the workpiece is continuously and synchronously conveyed into the process section through the inner circulation conveyor steel strip 8 for heat treatment; thus, the heat treatment process of the ultra-thin strip 9 (workpiece) is completed. During the entire heat treatment process, the control system 13 completes the following control processes:

[0050] 1) Main drive control

[0051] Specify the operating speeds of the annealing furnace unit (including the feeding mechanism 3, the heating system 4, the cooling system 5, and the discharging mechanism 6), the workpiece (strip) coiling unit, and the workpiece (strip) uncoiling unit, and control the operating speeds of the annealing furnace unit, the workpiece (strip) coiling unit, and the workpiece (strip) uncoiling unit to be constant; control the uncoiling tension of the uncoiling unit, the coiling tension of the coiling unit, and the tension of the driving mechanism 7 in the process section to be constant, and make the micro-tension of the inner circulation conveyor steel strip 8 constant by controlling the tension of the driving mechanism 7 in the process section to be constant; measure the coil diameter of the workpiece uncoiling and coiling through the sensors set in the uncoiling mechanism and the coiling mechanism and calculate the coil diameter.

[0052] 2) Production process control

[0053] During the heat treatment process, control the interlocking, jogging and linkage among the annealing furnace unit (including the feeding mechanism 3, heating system 4, cooling system 5 and discharging mechanism 6), rewinding mechanism and unwinding mechanism according to the conventional heat treatment process, and control the running speeds of the annealing furnace unit (including the feeding mechanism 3, heating system 4, cooling system 5 and discharging mechanism 6), rewinding mechanism and unwinding mechanism, as well as the micro-tension of the rewinding mechanism, unwinding mechanism and the inner circulation transmission steel belt 8.

[0054] 3) Auxiliary system process control

[0055] Monitor the entire heat treatment process, with real-time display and automatic interlocking functions for system failures, alarms, etc., to meet the various functions required for the conventional heat treatment process of the annealing furnace unit (including the feeding mechanism 3, heating system 4, cooling system 5 and discharging mechanism 6), rewinding mechanism and unwinding mechanism, as well as the safety requirements of the electrical system and mechanical equipment. To meet the various functions required for the operation of each unit and the safety of the electrical system and mechanical equipment, all auxiliary systems have automatic interlocking functions. There is also real-time display of system failures, alarms, etc.

[0056] 4) Control the inner circulation transmission steel belt 8 to be synchronized and constant with the running speed of the workpiece

[0057] The speed control of the inner circulation transmission steel belt 8 is extremely important in the control of the entire unit, and its stability can directly affect the product quality. The said speed control mainly includes: constant speed control, acceleration and deceleration control, and tension control.

[0058] During the operation of this embodiment, the workpiece (ultra-thin belt) is conveyed from the unwinding to the rewinding direction. The unwinding roll diameter is continuously decreasing, while the rewinding roll diameter is continuously increasing. When the tension (pulling force) of the workpiece (ultra-thin belt) is constant, the torque of the rewinding roll is also continuously changing. During this process, it is necessary to continuously control the output torque of the motor to keep the tension constant.

[0059] The following takes the rewinding mechanism as an example to illustrate the roll diameter measurement and tension control:

[0060] The rewinding roll in the rewinding unit is connected with a servo motor, and the rotation speed N of the rewinding roll can be output and feedback in real time through the sensor installed in the output shaft of the servo motor 收 and the torque M 收 .

[0061] The sensor installed on the rewinding tension roll 11-2 can measure the rotation speed N of the rewinding tension roll 11-2 张 and the tension measurement F of this rewinding tension roll 11-2 张 . Specifically: measure the rotation speed of the rewinding tension roll 11-2 as N 张 , and measure the tension of the rewinding tension roll 11-2 as F 张 .

[0062] The linear velocity V of the winding tension roller 11-2 张 = π * N 张 * D 张 , the linear velocity V of the winding roller 收 = π * N 收 * D 收 ; where: D 收 is the diameter of the winding roller, D 张 is the diameter of the winding tension roller 11-2.

[0063] The speeds of the ultra-thin steel strip (workpiece) passing through each roller involved in the process section are the same, that is, V 带 = V 张 = V 收 * N 张 * D 张 = N 收 * D 收 , therefore, the speed of the inner loop conveyor steel strip 8 is controlled to be the same as that of the ultra-thin steel strip, that is, also V 带 = V 张 = V 收 * N 张 * D 张 = N 收 * D 收 .

[0064] So the coil diameter, that is, D 收 = N 张 * D 张 / N 收 , can be measured in real time.

[0065] And the winding torque M 收 = F 张 * D 收 / 2 = F 张 * N 张 * D 张 / N 收 / 2.

[0066] Therefore, by setting the value of the tension and the tension control amount, the motor output tension can be controlled to be constant.

[0067] Where:

[0068] The speed V of the ultra-thin metal strip (workpiece) and the inner loop conveyor steel strip 8 带 (m / s), the linear velocity V of the winding tension roller and the unwinding tension roller (abbreviation: tension roller) 张 (m / s), the rotational speed N of the winding tension roller and the unwinding tension roller (abbreviation: tension roller) 张 (r / s), the diameter D of the winding tension roller and the unwinding tension roller (abbreviation: tension roller) 张(M), the tension F of the rewinding tension roller and the unwinding tension roller (abbreviation: tension roller) 张 (N), the rewinding torque M 收 (NM), the rewinding speed V 收 (M / S), the rotational speed N of the rewinding roller 收 (M / S), the diameter (coil diameter) D of the rewinding 收 (M).

[0069] Through the above method, tension control and coil diameter measurement can be achieved to achieve the purpose of constant tension control.

[0070] Synchronous control:

[0071] The synchronization of the speed of the ultra-thin strip (workpiece) in the continuous heating annealing furnace and the speed of the inner circulating conveyor steel strip 8 is controlled by a servo motor. The speed V of the inner circulating conveyor steel strip in the furnace 内 According to V 张 The measured speed is driven by a servo motor to achieve the speed V of the inner circulating conveyor steel strip 内 and the speed V of the tension roller 张 To keep consistent.

[0072] By the same token, referring to the relevant data measurement in the rewinding mechanism, the control principle of the unwinding unit and the measurement of the unwinding speed and tension are the same.

[0073] To sum up, this embodiment can make the ultra-thin strip run synchronously on the inner circulating conveyor steel strip 8 when passing through the process section of the continuous heating annealing furnace, solve the problem that the steel strip cannot establish tension, and ensure the annealing quality of the ultra-thin strip; thus solving the technical problem of continuous bright annealing heat treatment of ultra-thin metal strips.

[0074] The key technical points of the present invention

[0075] 1. The inner circulating conveyor steel strip and the ultra-thin strip run synchronously. 2. Micro-tension steel strip control. 3. Intelligent control system.

Claims

1. A heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials, comprising a continuous heating and annealing furnace and a control system (13). In the continuous heating and annealing furnace (20), there are a feeding mechanism (3), a heating system (4), a cooling system (5) and a discharging mechanism (6). At the inlet end of the continuous heating and annealing furnace (20), there is an unwinding mechanism, and at the outlet end, there is a winding mechanism. It is characterized in that: In the process section of the continuous heating annealing furnace (20), an internal circulation synchronous conveying structure is provided. The internal circulation synchronous conveying structure is composed of a driving mechanism (7) and an internal circulation conveying steel belt (8) connected. The driving mechanism (7) drives the internal circulation conveying steel belt (8) to synchronously pass through the heating system (4) and the cooling system (5) and continuously circulate, so that the internal circulation conveying steel belt (8) supports and passes through the process section of the continuous heating annealing furnace synchronously with the workpiece, forming a micro-tension workpiece conveying and supporting structure; the output end of the unwinding mechanism is connected to the input end of the internal circulation conveying structure, so that the workpiece passing through the process section of the continuous heating annealing furnace is carried on the internal circulation conveying steel belt (8), and the input end of the winding mechanism is connected to the output end of the internal circulation conveying structure; the control system (13) has a number of signal input ends and a number of signal output ends. The signal output ends of the control system (13) are connected to the control signal input ends of the heating system (4), the cooling system (5), the unwinding mechanism, the winding mechanism and the internal circulation conveying structure. The control system (13) controls the synchronous operation of the unwinding mechanism, the winding mechanism and the internal circulation conveying structure, so that the running speed of the internal circulation conveying steel belt (8) is the same as the forward speed of the workpiece, forming a synchronous control structure; the signal input ends of the control system (13) are connected to the signal output ends of the heating system (4), the cooling system (5), the unwinding mechanism, the winding mechanism and the internal circulation conveying structure, forming a signal feedback structure; thus, a processing production line for continuous heating annealing of micro-tension ultra-thin strip materials with a closed-loop synchronous control structure is formed. In the internal circulation conveying structure, the driving mechanism (7) is composed of a driving motor, two main drive shafts (7-1) and two secondary drive shafts (7-2). The two main drive shafts (7-1) are arranged at both ends of the continuous annealing furnace, and their position heights are equivalent to those of the unwinding mechanism and the winding mechanism, so that the internal circulation conveying steel belt (8) just supports the workpiece; the two secondary drive shafts (7-2) are respectively arranged inside and below one main drive shaft (7-1), forming a four-point support structure; the internal circulation conveying steel belt (8) is connected to the four-point support structure to form an internal circulation structure; the main drive shaft (7-1) is connected to the output shaft of the driving motor, and the control input end of the driving motor is connected to a signal output end of the control system (13). A pressure sensor and a speed sensor are provided at the output shaft of the driving motor or on the main drive shaft (7-1). The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system (13), forming a closed-loop control structure. A pressure sensor and a speed sensor are provided at the unwinding roller of the unwinding mechanism or at the output shaft of the unwinding motor. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of the control system. A signal output end of the control system is connected to the control signal input end of the unwinding motor, constituting a closed-loop unwinding control structure. A pressure sensor and a speed sensor are provided at the winding roller of the winding mechanism and the output shaft of the winding motor. The electrical signal output terminals of the pressure sensor and the speed sensor are respectively connected to a signal input terminal of the control system. A signal output terminal of the control system is connected to the control signal input terminal of the winding motor, forming a closed-loop winding control structure.

2. The heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials according to claim 1, wherein: A deviation rectifying device (10) is provided in the winding mechanism. A series structure is formed by the deviation rectifying device (10), the winding unit (12) and the winding tension control unit (11). The deviation rectifying device (10) is in the front, the winding tension control unit (11) is in the middle, and the winding unit (12) is in the rear, forming a deviation rectifying type winding mechanism.

3. The heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials according to claim 1, wherein: The control system (13) controls the rotation speed of the driving motor so that the speed of the inner loop conveyor steel belt (8) is synchronized with the forward speed of the workpiece.

4. The heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials according to claim 3, characterized in that: The unwinding mechanism is composed of an unwinding unit (1) and an unwinding tension control unit (2) in series. The unwinding unit (1) is in the front and the unwinding tension control unit (2) is in the rear. The workpiece is conveyed to the inner loop conveyor steel belt (8) through the unwinding tension control unit (2). The winding mechanism includes a winding unit (12) and a winding tension control unit (11). The winding unit (12) and the winding tension control unit (11) form a series structure. The winding tension control unit (11) is in the front and the winding unit (12) is in the rear. After the workpiece is conveyed from the inner loop conveyor steel belt (8) to the input end of the winding tension control unit (11), the tension and speed are controlled by the winding tension control unit (11), and finally it enters the winding unit (12).

5. The heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials according to claim 4, wherein: The unwinding unit (1) is composed of an unwinding motor and an unwinding roller (1-1). A pressure sensor and a speed sensor are provided at the unwinding roller (1-1) or the output shaft of the unwinding motor. The electrical signal output terminals of the pressure sensor and the speed sensor are respectively connected to a signal input terminal of the control system (13). A signal output terminal of the control system (13) is connected to the control signal input terminal of the unwinding motor, forming a closed-loop unwinding control structure. The unwinding tension control unit (2) is composed of an unwinding tension motor (2-1) and three unwinding tension rollers (2-2). The three unwinding tension rollers (2-2) are arranged in a triangle, forming a three-stage straightening and adjustment structure. A pressure sensor and a speed sensor are provided at the output shaft of the unwinding tension motor (2-1) or one of the unwinding tension rollers (2-2). The electrical signal output terminals of the pressure sensor and the speed sensor are respectively connected to a signal input terminal of the control system (13). A signal output terminal of the control system (13) is connected to the control signal input terminal of the unwinding tension motor (2-1), forming a closed-loop unwinding tension control structure.

6. The heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials according to claim 4, characterized in that: The coiling unit (12) consists of a coiling motor and a coiling roller (12-1). A pressure sensor and a speed sensor are provided at the output shaft of the coiling roller (12-1) and the coiling motor. The electrical signal output terminals of the pressure sensor and the speed sensor are respectively connected to a signal input terminal of the control system (13). A signal output terminal of the control system (13) is connected to the control signal input terminal of the coiling motor, forming a closed-loop coiling control structure; The coiling tension control unit (11) consists of a coiling tension motor (11-1) and four coiling tension rollers (11-2). The four coiling tension rollers (11-2) are arranged in an "S" shape, forming a four-stage straightening and adjustment structure; A pressure sensor and a speed sensor are provided at the output shaft of the coiling tension motor (11-1) and one of the coiling tension rollers (11-2). The electrical signal output terminals of the pressure sensor and the speed sensor are connected to a signal input terminal of the control system (13). A signal output terminal of the control system (13) is connected to the control signal input terminal of the coiling tension motor (11-1), forming a closed-loop coiling tension control structure; The control system (13) controls the rotational speeds of the coiling tension motor (11-1) and the coiling motor, so that the linear speeds of the coiling tension rollers (11-2) and the coiling roller (12-1) are synchronized with the speed of the inner circulation conveyor steel belt (8) and the forward speed of the workpiece.

7. The heat treatment production line for continuous heating and annealing of micro-tension ultra-thin strip materials according to claim 2, wherein: The deviation rectifying device (10) consists of two groups of rollers (10-1) arranged at high and low positions; The deviation rectifying device constitutes a deviation rectifying control adjustment system, which consists of a deviation rectifying adjustment roller and a deviation rectifying guide roller. A strip position detector is installed between the two rollers, and an offset electric cylinder is installed on the deviation rectifying adjustment roller to control the angle of the deviation rectifying adjustment roller.

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