Method and device for relieving stress of thin metal strip in heat treatment process

Abstract

The invention relates to a method and a device for eliminating stress of a metal thin strip in heat treatment, which are characterized in that: 1) a large-tension metal thin strip conveying mechanism is arranged in a heat treatment furnace of the metal thin strip, and the metal thin strip conveying mechanism keeps tension of 3-6 tons in a workpiece conveying process; and (2) the tension borne by the workpiece is kept to be 3-6 tons through a tension control mechanism of the large-tension metal thin strip conveying mechanism, so that the internal stress of the workpiece disappears in the conveying process, namely the tension borne by the workpiece in the conveying process is kept to be constant to be 3-6 tons, and the internal stress of the workpiece is eliminated when the workpiece passes through the process section of the heat treatment furnace. The large-tension metal thin strip conveying mechanism comprises an unwinding mechanism, a winding mechanism and a tension control mechanism, and the tension between the unwinding mechanism and the winding mechanism is controlled to be 3-6 tons constantly through the tension control mechanism, so that a large-tension control structure is formed. The device has the characteristics of simple structure, low cost, good stress eliminating effect and the like, and prevents the copper strip from vibrating and the workpiece from deforming.

Description

Technical Field

[0001] The present invention relates to a method and device for eliminating stress in heat treatment of thin metal strips, and is particularly applicable to eliminating stress in heat treatment of copper thin strips (or eliminating stress and preventing workpiece deformation during etching annealing heat treatment). It belongs to the technical field of heat treatment of ultra-thin metal strips. Background Art

[0002] Products of thin metal strips (such as copper thin strips) 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. Production practice has proved that after metal (such as copper) is processed into copper thin strips, the internal grains of the copper thin strips will change, resulting in internal stress. By continuously heating and annealing the copper thin strips in a continuous annealing furnace, the deformed grains can be re-transformed into uniform equiaxed grains, while eliminating work hardening and residual internal stress, so that the structure and properties of the copper strip can be restored to the heat treatment process quality before the cold rolling deformation state.

[0003] The heat treatment equipment for metal thin strip materials (such as copper thin strip materials, aluminum thin strip materials or stainless steel thin strip materials) in the prior art generally uses an air cushion furnace, and its structure generally includes: a furnace body (or a box body), a quenching area of the furnace body (or the box body), and a strip tension roller group arranged in the air cushion furnace and used for conveying the strip forward, etc. For example, the invention with the Chinese patent announcement public name of "A Copper Strip Heat Treatment Device and Its Use Method" and the application number of "2019106054968" includes a first box body and a second box body. A connecting pipe is connected between the first box body and the second box body. A natural gas heating pipe is connected inside the first box body. A natural gas inlet pipe communicating with the natural gas heating pipe is connected to the outer wall of the first box body. A push plate is slidably connected inside the first box body. The bottom of the push plate is respectively connected with a first rotating shaft and a second rotating shaft. A first sleeve and a second sleeve are respectively connected to the first rotating shaft and the second rotating shaft. The ends of the first rotating shaft and the second rotating shaft far from the push plate are connected with a fixing plate. A coolant tank is connected inside the second box body. For this copper strip heat treatment device, when it is necessary to heat the copper strip, first open the end cover on the first box body, put the first sleeve and the second sleeve on the first rotating shaft and the second rotating shaft respectively, then put a copper strip coil on the first sleeve, and the push plate is composed of two parts connected and fixed by bolts. Therefore, the cylinder, the first rotating shaft and the second rotating shaft are all clamped in the push plate, which is convenient for disassembling and installing the copper strip. Then connect one end of the copper strip coil to the second sleeve, and then put the prepared first rotating shaft and second rotating shaft into the first box body, fix the support plate on the cross plate on the inner wall of the first box body by bolts, and then inject natural gas through the natural gas inlet pipe, so that the natural gas heating pipe heats the copper strip inside the first box body. At the same time, start the stepping motor in the third box body, so that the first gear drives the second gear to rotate, so that the first rotating shaft and the second rotating shaft rotate, and the copper strip coil is wound from the first sleeve to the second sleeve. There are problems such as complex structure and high cost. In order to solve the problems of complex structure and high cost existing in the air cushion furnace, technicians have also adopted some methods. For example, the Chinese patent announcement discloses the application number of "2019210872508" and the name of "An Annealing Device for Eliminating Stress during the Heat Treatment of Copper Strip", which includes a condensation tank, an annealing box and a cooling chamber. A hatch is hinged on the front of the annealing box, and a control panel is installed on the outside of the hatch. The copper strip passes horizontally through the main pipe, and one end of the copper strip passes through a guide wheel, a tension wheel, a positioning wheel and a discharge port in sequence. In this utility model, by setting a temperature sensor and a heating block, the temperature sensor monitors the temperature inside the device in real time to achieve temperature control. Through heating and annealing operations, the stress in the copper strip is eliminated. At the same time, the device is equipped with a vibration mechanism. The bottom end of the vibration mechanism is fixedly connected with a vibration rod, and tension wheels are evenly fixed on the fixed rod. When the vibration mechanism works to generate vibration, it drives the tension wheels to vibrate, so that the copper strip vibrates, generating a vibration effect, which is beneficial to eliminating the stress in the copper strip.Although this utility model can solve the problems of complex structure and high cost existing in the air cushion furnace, it has problems such as copper strip vibration, easy deformation of workpieces, and poor stress elimination effect. Summary of the Invention

[0004] The object of the present invention is to solve the problems in the prior art that the equipment structure for eliminating internal stress in workpieces during the heat treatment of metal thin strip materials is complex, the cost is relatively high, or there are problems such as workpiece vibration, easy deformation of workpieces, and poor stress elimination effect. A method and device for eliminating stress during the heat treatment of metal thin strip materials are provided. It has prominent substantive features and remarkable technical progress such as simple equipment structure, low cost, prevention of workpiece vibration, prevention of workpiece deformation, and good stress elimination effect.

[0005] One of the objects of the present invention can be achieved by adopting the following technical solutions:

[0006] A method for eliminating stress during the heat treatment of metal thin strip materials, characterized in that:

[0007] 1) A large-tension metal thin strip material conveying mechanism is arranged in the heat treatment furnace for metal thin strip materials. During the process of conveying workpieces, the tension of this metal thin strip material conveying mechanism is maintained at 3 - 6 tons;

[0008] 2) Through the tension control mechanism of the large-tension metal thin strip material conveying mechanism, the tension borne by the workpiece is maintained at 3 - 6 tons, so that the internal stress of the workpiece disappears during the conveying process, that is, the tension borne by the workpiece during the conveying process is kept constant at 3 - 6 tons to achieve the elimination of the internal stress of the workpiece when passing through the process section of the heat treatment furnace.

[0009] One of the objects of the present invention can also be achieved by adopting the following technical solutions:

[0010] Furthermore, the large-tension metal thin strip material conveying mechanism includes an unwinding mechanism, a winding mechanism, and a tension control structure. The unwinding mechanism is arranged at the inlet end of the heat treatment furnace, and the winding mechanism is arranged at the outlet end of the heat treatment furnace. The unwinding mechanism and the winding mechanism are roller mechanisms; the control output end of the tension control mechanism is connected to the control input ends of the unwinding mechanism and the winding mechanism. By controlling the tension between the unwinding mechanism and the winding mechanism to be constantly 3 - 6 tons through the tension control mechanism, a large-tension control structure is formed.

[0011] Furthermore, the metal thin strip material is copper thin strip material, aluminum thin strip material, or stainless steel thin strip material.

[0012] Further, an inner circulation synchronous transmission structure is provided between the unwinding mechanism and the winding mechanism or in the process section of the heat treatment furnace. The inner circulation synchronous transmission structure is independent of the metal strip conveying mechanism and is synchronized with the metal strip conveying mechanism. The inner circulation synchronous transmission structure is composed of a transmission mechanism and an inner circulation steel belt. The transmission mechanism drives the inner circulation transmission steel belt to continuously circulate synchronously, so that the inner circulation transmission steel belt supports and drives the workpiece to pass through the process section of the heat treatment furnace synchronously with the transmission system, forming a workpiece conveying and supporting structure.

[0013] The second object of the present invention can be achieved by adopting the following technical solutions:

[0014] A device for eliminating stress in metal strips during heat treatment, including a heat treatment furnace and a control system. Its structural characteristics are as follows: It further includes a large-tension metal strip conveying mechanism, which includes an unwinding mechanism, a winding mechanism, and a tension control structure. The unwinding mechanism is arranged at the inlet end of the heat treatment furnace, and the winding mechanism is arranged at the outlet end of the heat treatment furnace. The unwinding mechanism and the winding mechanism are roller mechanisms. The control output end of the tension control mechanism is connected to the control input ends of the unwinding mechanism and the winding mechanism. By controlling the tension between the unwinding mechanism and the winding mechanism to be 3-6 tons through the tension control mechanism, a large-tension control structure is formed. The signal input end of the tension control mechanism is connected to the signal output ends of the unwinding mechanism and the winding mechanism, forming a signal feedback structure. A closed-loop control system is formed through the signal feedback structure to control the tension of the workpiece during transportation to be constantly 3-6 tons, forming a large-tension transportation structure, so as to eliminate the internal stress of the workpiece when it passes through the process section of the heat treatment furnace.

[0015] The second object of the present invention can also be achieved by adopting the following technical solutions:

[0016] Further, 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 back. The winding mechanism includes a winding unit 11 and a winding tension control unit 12. The winding unit 11 and the winding tension control unit 12 form a series structure. The winding tension control unit 12 is in the front and the winding unit 11 is in the back. After the workpiece is conveyed to the input end of the winding tension control unit 12, the tension and speed are controlled by the winding tension control unit 12, and finally it enters the winding unit 11. The tension control mechanism is composed of the unwinding tension control unit 2 and the winding tension control unit 12. The tension of the workpiece during transportation is controlled to be constantly 3-6 tons through the tension control mechanism.

[0017] Furthermore, the unwinding unit 1 consists of an unwinding motor and an unwinding roller 1-1. A pressure sensor and a speed sensor are arranged at the output shaft of the unwinding roller 1-1 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 13. A signal output end of the control system 13 is connected to the control signal input end of the unwinding motor, forming a closed-loop unwinding control structure; the unwinding tension control unit 2 consists 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 arranged at the output shaft of the unwinding tension motor 2-1 or 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, forming a closed-loop unwinding tension control structure; the winding unit 12 consists of a winding motor and a winding roller 12-1. A pressure sensor and a speed sensor are arranged at the output shaft of the winding roller 12-1 or the winding motor. The electrical signal output ends of the pressure sensor and the speed sensor are 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 winding motor, forming a closed-loop winding control structure; the winding tension control unit 11 consists of a winding tension motor 11-1 and four winding tension rollers 11-2. The four winding 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 arranged at the output shaft of the winding tension motor 11-1 or one of the winding tension rollers 11-2. 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 winding tension motor 11-1, forming a closed-loop winding tension control structure; the closed-loop tension control structure is composed of the closed-loop unwinding tension control structure and the closed-loop winding tension control structure. The tension of the workpiece during the conveying process is controlled to be constant at 3-6 tons through the closed-loop tension control mechanism.

[0018] Furthermore, 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 at the back, forming a deviation rectifying winding mechanism; 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 and adjusting system, which is composed of a deviation rectifying adjusting roller and a deviation rectifying guiding roller. A strip position detector is installed between the two rollers, and an offset electric cylinder is installed on the deviation rectifying adjusting roller to control the angle of the deviation rectifying adjusting roller.

[0019] Furthermore, an internal circulation synchronous conveying structure is provided in the process section of the heat treatment furnace. The internal circulation synchronous conveying structure is composed of a transmission mechanism 7 and an internal circulation steel belt 8. 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 also form turning rollers. 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 steel belt 8 just supports the workpiece. The two secondary shafts 7-2 are respectively arranged inside and below one main transmission shaft 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 provided 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 to synchronize the speed of the internal circulation steel belt 8 with the forward speed of the workpiece.

[0020] The present invention has the following outstanding substantial features and remarkable progress:

[0021] 1. The method for eliminating stress in the heat treatment of metal thin strips involved in the present invention, due to the provision of a large-tension metal thin strip conveying mechanism in the heat treatment furnace of the metal thin strip. The large-tension metal thin strip conveying mechanism maintains a tension of 3-6 tons during the conveying of the workpiece. By means of the tension control mechanism of the large-tension metal thin strip conveying mechanism, the tension borne by the workpiece is maintained at 3-6 tons, so that the internal stress of the workpiece disappears during the conveying process, that is, the tension borne by the workpiece during the conveying process is kept constant at 3-6 tons to eliminate the internal stress of the workpiece when passing through the process section of the heat treatment furnace. Therefore, it can solve the problems in the prior art such as complex structure, high cost, copper strip vibration, easy deformation of the workpiece, and poor stress elimination effect in the heat treatment of copper strip etching. It has outstanding substantial features and remarkable technical progress such as simple equipment structure, low cost, prevention of copper strip vibration, prevention of workpiece deformation, and good stress elimination effect.

[0022] 2. The device for eliminating stress of metal strip during heat treatment according to the present invention includes a heat treatment furnace and a control system. Its structural characteristics are as follows: It further includes a large-tension metal strip conveying mechanism, which includes an unwinding mechanism, a winding mechanism and a tension control structure. The unwinding mechanism is arranged at the inlet end of the heat treatment furnace, and the winding mechanism is arranged at the outlet end of the heat treatment furnace. The unwinding mechanism and the winding mechanism are roller mechanisms; the control output end of the tension control mechanism is connected to the control input ends of the unwinding mechanism and the winding mechanism, and the tension between the unwinding mechanism and the winding mechanism is controlled to be 3-6 tons by the tension control mechanism, forming a large-tension control structure; the signal input end of the tension control mechanism is connected to the signal output ends of the unwinding mechanism and the winding mechanism, forming a signal feedback structure; a closed-loop control system is formed through the signal feedback structure to control the tension of the workpiece during the conveying process to be constantly 3-6 tons, forming a large-tension conveying structure, so as to eliminate the internal stress of the workpiece when passing through the process section of the heat treatment furnace. Therefore, it can solve the problems in the prior art such as complex structure, high cost, copper strip vibration, easy deformation of workpieces, and poor stress elimination effect in copper strip etching heat treatment, and has outstanding substantive features and remarkable technical progress such as simple structure, low cost, prevention of copper strip vibration, prevention of workpiece deformation, and good stress elimination effect.

[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, the winding tension control unit and the winding unit, with the deviation rectifying device in the front, the winding tension control unit in the middle, and the winding unit in the back, forming a deviation rectifying type winding mechanism. Therefore, it can correct the deviation of the workpiece (strip) before entering the winding tension control unit, ensure accurate tension control during winding and make the workpiece (strip) more neat and firm after winding, and has the characteristics of accurate product winding control, good product winding quality and high efficiency.

[0024] 4. Since an internal circulation synchronous conveying structure is provided in the process section of the heat treatment furnace of the present invention, its main difference from the existing mesh belt conveying structure is that through a synchronous control structure, the unwinding mechanism, the winding mechanism and the 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 forward speed of the workpiece, forming a synchronous running type internal circulation workpiece conveying and supporting structure, without the need to set roller pressing mechanisms at the inlet and outlet ends of the heat treatment furnace, avoiding roller marks and indentations on the workpiece. Its main difference 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 outstanding substantive features and remarkable technical progress such as 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 roller marks and indentations on the surface of the workpiece, no noise and energy saving. Description of the Drawings

[0025] Figure 1 It is a schematic structural diagram of the large-tension mechanism in Specific Embodiment 1 of the present invention.

[0026] Figure 2 It is a schematic structural diagram of the winding mechanism in the large-tension mechanism in Specific Embodiment 1 of the present invention.

[0027] Figure 3 It is a front view structural schematic diagram of the production line in Specific Embodiment 1 of the present invention.

[0028] Figure 4 It is a sectional view structural schematic diagram of the production line in Specific Embodiment 1 of the present invention.

[0029] Figure 5 It is a three-dimensional structural schematic diagram of the production line in Specific Embodiment 1 of the present invention.

[0030] Figure 6 It is a schematic diagram of the heat treatment effect in Specific Embodiment 1 of the present invention. Detailed implementation manners Specific Embodiment 1:

[0032] Refer to Figure 1 to Figure 2 In this embodiment, the device for eliminating stress in the heat treatment of metal thin strip materials includes a heat treatment furnace and a control system, and further includes a large-tension metal thin strip conveying mechanism. The large-tension metal thin strip conveying mechanism includes an unwinding mechanism, a winding mechanism and a tension control structure. The unwinding mechanism is arranged at the inlet end of the heat treatment furnace, and the winding mechanism is arranged at the outlet end of the heat treatment furnace. The unwinding mechanism and the winding mechanism are roller mechanisms. The control output end of the tension control mechanism is connected to the control input ends of the unwinding mechanism and the winding mechanism. By controlling the tension between the unwinding mechanism and the winding mechanism to be 3 - 6 tons through the tension control mechanism, a large-tension control structure is formed. The signal input end of the tension control mechanism is connected to the signal output ends of the unwinding mechanism and the winding mechanism to form a signal feedback structure. A closed-loop control system is formed through the signal feedback structure to control the tension of the workpiece to be constant at 3 - 6 tons during the conveying process, forming a large-tension conveying structure, so as to eliminate the internal stress of the workpiece when passing through the process section of the heat treatment furnace.

[0033] In this embodiment:

[0034] 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 winding mechanism includes a winding unit 11 and a winding tension control unit 12. The winding unit 11 and the winding tension control unit 12 form a series structure. The winding tension control unit 12 is in the front and the winding unit 11 is in the rear. After the workpiece is conveyed to the input end of the winding tension control unit 12, the tension and speed are controlled by the winding tension control unit 12 and finally enter the winding unit 11; the tension control mechanism is composed of the unwinding tension control unit 2 and the winding tension control unit 12; the tension control mechanism is composed of the unwinding tension control unit 2 and the winding tension control unit 12, and the tension of the workpiece during conveying is controlled to be constant at 3 - 6 tons through the tension control mechanism.

[0035] 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 output shaft of the unwinding roller 1-1 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 a control system 13. A signal output end of the control system 13 is connected to the control signal input end 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 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 a 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, forming a closed-loop unwinding tension control structure.

[0036] The winding unit 12 is composed of a winding motor and a winding roller 12-1. A pressure sensor and a speed sensor are arranged at the output shaft of the winding roller 12-1 or the winding motor. The electrical signal output ends of the pressure sensor and the speed sensor are connected to a signal input end of a control system 13. A signal output end of the control system 13 is connected to the control signal input end of the winding motor, forming a closed-loop winding control structure; the winding tension control unit 11 is composed of a winding tension motor 11-1 and four winding tension rollers 11-2. The four winding tension rollers 11-2 are arranged in an "S" shape to form 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 11-1 or at one of the winding tension rollers 11-2. The electrical signal output ends of the pressure sensor and the speed sensor are respectively connected to a signal input end of a control system 13. A signal output end of the control system 13 is connected to the control signal input end of the winding tension motor 11-1, forming a closed-loop winding tension control structure.

[0037] The closed-loop tension control structure is composed of a closed-loop unwinding tension control structure and a closed-loop winding tension control structure. The closed-loop tension control mechanism controls the tension of the workpiece during transportation to be constantly 3 - 6 tons.

[0038] An alignment device 10 is provided in the winding mechanism. The alignment device 10, the winding unit 12, and the winding tension control unit 11 form a series structure. The alignment device 10 is in the front, the winding tension control unit 11 is in the middle, and the winding unit 12 is at the back, forming an alignment winding mechanism. The alignment device 10 consists of two groups of rollers 10 - 1 arranged at high and low positions. The alignment device constitutes an alignment control adjustment system, which consists of an alignment adjustment roller and an alignment guiding roller. A strip position detector is installed between the two rollers, and an offset electric cylinder is installed on the alignment adjustment roller to control the angle of the alignment adjustment roller.

[0039] The method for eliminating stress in heat treatment in the actual application of this embodiment is characterized in that:

[0040] 1) A large-tension metal strip conveying mechanism is provided in the heat treatment furnace for metal thin strips. This metal thin strip conveying mechanism maintains a tension of 3 - 6 tons during the transportation of the workpiece.

[0041] 2) Through the tension control mechanism of the large-tension metal strip conveying mechanism, the tension borne by the workpiece is maintained at 3 - 6 tons, so that the internal stress of the workpiece disappears during transportation, that is, the tension borne by the workpiece during transportation is kept constant at 3 - 6 tons to eliminate the internal stress of the workpiece when passing through the process section of the heat treatment furnace.

[0042] Furthermore, the large-tension metal strip conveying mechanism includes an unwinding mechanism, a winding mechanism, and a tension control structure. The unwinding mechanism is arranged at the inlet end of the heat treatment furnace, and the winding mechanism is arranged at the outlet end of the heat treatment furnace. The unwinding mechanism and the winding mechanism are roller mechanisms. The control output end of the tension control mechanism is connected to the control input ends of the unwinding mechanism and the winding mechanism. The tension between the unwinding mechanism and the winding mechanism is controlled to be 3 - 6 tons through the tension control mechanism to form a large-tension control structure.

[0043] During the operation of this embodiment, the workpiece (metal thin strip, or copper thin strip, aluminum thin strip, or stainless steel thin strip) is conveyed from the unwinding to the winding direction. The diameter of the unwinding roll is continuously decreasing, while the diameter of the winding roll is continuously increasing. When the tension (tensile force) of the workpiece (metal thin strip, or copper thin strip, aluminum thin strip, or stainless steel thin strip) is constant, the torque of the winding roll is also constantly changing. During this process, it is necessary to continuously control the output torque of the motor to keep the tension constant.

[0044] The following takes the winding mechanism as an example to illustrate the constant tension control of this embodiment:

[0045] The winding roll in the winding unit is connected to a servo motor, and the rotation speed N of the winding roll can be output and fed back in real time through the sensor installed in the output shaft of the servo motor. 收 And the torque M 收 .

[0046] The sensor installed on the winding tension roll 11-2 can measure the rotation speed N of the winding tension roll 11-2 张 And the tension measurement F of the winding tension roll 11-2 张 . Specifically: Measure the rotation speed of the winding tension roll 11-2 as N 张 , and measure the tension of the winding tension roll 11-2 as F 张 .

[0047] The linear velocity V of the winding tension roll 11-2 张 =π*N 张 *D 张 , the linear velocity V of the winding roll 收 =π*N 收 *D 收 ; where: D 收 is the diameter of the winding roll, and D 张 is the diameter of the winding tension roll 11-2.

[0048] The speeds of the workpieces (metal thin strips, or copper thin strips, aluminum thin strips or stainless steel thin strips) passing through the various rollers 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 belt 8 is controlled to be the same as the speed of the ultra-thin steel belt, that is, both are V 带 =V 张 =V 收 *N 张 *D 张 =N 收 *D 收 .

[0049] So the coil diameter, that is, D 收 =N 张 *D 张 / N 收 , can be measured in real time.

[0050] And the winding torque M 收 =F 张 *D 收 / 2 = F 张 *N 张 *D 张 / N 收 / 2.

[0051] Therefore, by setting the value of the tension and the tension control amount, the output tension of the motor can be controlled to be constant (in this embodiment: constant 3 - 6 tons).

[0052] Among them:

[0053] The speed V of the workpiece (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip) and the inner - loop conveyor steel belt 8 带 (m / s), the linear speed 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 The tension F of the winding tension roller and the unwinding tension roller (abbreviation: tension roller) 张 (N), the winding torque M 收 (N·m), the winding speed V 收 (m / s), the rotational speed N of the winding roller 收 (m / s), the diameter (coil diameter) D of the winding 收 (m).

[0054] Through the above - mentioned method, tension control and coil diameter measurement can be achieved to achieve the purpose of constant - tension (for example: constant 3 - 6 tons) control.

[0055] Refer to Figure 3 - Figure 6, in practical applications, the heat treatment production line includes a continuous heating annealing furnace and a control system 13. In the continuous heating annealing furnace 20, there are a feeding mechanism 3, a heating system 4, a cooling system 5, and a discharging end mechanism 6. At the inlet end of the continuous heating 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 annealing furnace 20, there is an internal circulation synchronous transmission structure, which is composed of a transmission mechanism 7 and an internal circulation 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 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 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 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 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 annealing of micro-tension ultra-thin strip materials with a closed-loop synchronous control structure is formed.

[0056] 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 of conventional technology for continuous heat treatment furnaces. The pressure sensor can adopt a pressure sensor of conventional technology, and the speed sensor can adopt a speed sensor of conventional technology. The unwinding motor can adopt a servo motor of conventional technology, and the unwinding roller 1-1 can adopt a roller of conventional technology; the unwinding tension motor 2-1 can adopt a servo motor of conventional technology, and the unwinding tension roller 2-2 can adopt a roller of conventional technology. The winding motor can adopt a servo motor of conventional technology, and the winding roller 12-1 can adopt a roller of conventional technology; the winding tension motor 11-1 can adopt a servo motor of conventional technology, and the winding tension roller 11-2 can adopt a roller of conventional technology. The drive motor can adopt a servo motor of conventional technology, and the two main drive shafts 7-1 can adopt rollers of conventional technology. The deviation rectifying device 10 is composed of two groups of rollers 10-1 arranged at high and low positions, and the rollers 10-1 can adopt rollers of conventional technology. Specific Embodiment 2:

[0058] The features of this specific embodiment 2 are as follows: An internal circulation synchronous transmission structure is provided in the process section of the heat treatment furnace. The internal circulation synchronous transmission structure is composed of a transmission mechanism 7 and an internal circulation steel belt 8. 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 also constitute turning rollers. 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 steel belt 8 just supports the workpiece. The two secondary shafts 7-2 are respectively arranged inside and below one main transmission shaft 7-1 to form a four-point support structure. The internal circulation transmission 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 provided 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 to synchronize the speed of the internal circulation steel belt 8 with the forward speed of the workpiece.

[0059] In this embodiment, when the thin strip passes through the continuous heating annealing furnace, 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 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, and enabling the thin strip 9 to run synchronously on the internal circulation transmission steel belt 8.

[0060] Refer to Figure 1 to Figure 6 , the unwinding mechanism conveys the workpiece 9 (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip) to the feeding port 3 of the continuous heating annealing furnace 20, and then synchronously conveys it into the continuous heating annealing furnace 20 through the internal circulation transmission steel belt 8. After being heated by the heating system 4 and cooled by the cooling system 5 in the process section of the continuous heating annealing furnace 20, it is then synchronously conveyed to the discharging port 6 by the internal circulation transmission steel belt 8 to complete the heat treatment process of a section of the workpiece 9 (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip). The heat-treated workpiece section enters the winding mechanism at the outlet end of the continuous heating annealing furnace 20, and the winding mechanism synchronously winds the workpiece into a coil. The internal circulation transmission steel belt 8 is in continuous operation, so the workpiece is continuously and synchronously conveyed into the process section through the internal circulation transmission steel belt 8 for heat treatment; thus, the heat treatment process of the workpiece 9 (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip) is completed. During the entire heat treatment process, the control system 13 completes the following control process:

[0061] 1) Main drive control

[0062] Specify the operating speeds of the annealing furnace unit (including the feeding mechanism 3, heating system 4, cooling system 5, and discharging mechanism 6), the winding unit for the workpiece 9 (metal thin strip, or copper thin strip, aluminum thin strip, or stainless steel thin strip), and the unwinding unit for the workpiece 9 (metal thin strip, or copper thin strip, aluminum thin strip, or stainless steel thin strip), and control the operating speeds of the annealing furnace unit, the winding unit for the workpiece 9 (metal thin strip, or copper thin strip, aluminum thin strip, or stainless steel thin strip), and the unwinding unit for the workpiece 9 (metal thin strip, or copper thin strip, aluminum thin strip, or stainless steel thin strip) to be constant; control the unwinding tension of the unwinding unit, the coiling tension of the winding unit, and the tension of the drive 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 drive mechanism 7 in the process section to be constant; measure the coil diameter of the workpiece during unwinding and winding through the sensors installed in the unwinding mechanism and winding mechanism, and perform coil diameter calculation.

[0063] 2) Production process control

[0064] 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), the winding mechanism, and the unwinding mechanism according to the conventional heat treatment process, and control the operating speeds of the annealing furnace unit (including the feeding mechanism 3, heating system 4, cooling system 5, and discharging mechanism 6), the winding mechanism, and the unwinding mechanism, as well as the micro-tension of the winding mechanism, the unwinding mechanism, and the inner circulation conveyor steel strip 8.

[0065] 3) Auxiliary system process control

[0066] 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), the winding mechanism, and the 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. It also has real-time display of system failures, alarms, etc.

[0067] 4) Control the synchronization and constancy of the running speed of the inner circulation conveyor steel strip 8 and the workpiece

[0068] The speed control of the inner circulation conveyor steel strip 8 is extremely important in the overall unit control, and its stability can directly affect the product quality. The speed control mainly includes: constant speed control, acceleration and deceleration control, and tension control.

[0069] Synchronization control:

[0070] The synchronization of the speed of the ultra-thin strip (workpiece) in the continuous heating annealing furnace and the speed of the inner-loop conveyor steel belt 8 is controlled by a servo motor. The speed of the inner-loop conveyor steel belt in the furnace is V 内 According to V 张 The measured speed is driven by a servo motor to achieve the speed V of the inner-loop conveyor steel belt 内 and the speed V of the tension roller 张 to be kept consistent.

[0071] By the same token, it can be measured with reference to the relevant data in the rewinding mechanism. The control principle of the unwinding unit and the measurement of the unwinding speed and tension are the same.

[0072] The rest is the same as in the specific embodiment 1.

[0073] Other specific embodiments:

[0074] As an improvement of the technical solution, in the present invention, a deviation rectifying device is provided in the rewinding mechanism. A series structure is formed by the deviation rectifying device, the rewinding tension control unit, and the rewinding unit. The deviation rectifying device is in the front, the rewinding tension control unit is in the middle, and the rewinding unit is in the back, forming a deviation rectifying rewinding mechanism. Therefore, it can correct the deviation of the workpiece (metal thin strip, or copper thin strip, aluminum thin strip, or stainless steel thin strip) before entering the rewinding tension control unit, ensure accurate tension control during rewinding, and make the workpiece (metal thin strip, or copper thin strip, aluminum thin strip, or stainless steel thin strip) more neat and firm after rewinding, with the characteristics of accurate product rewinding control, good product rewinding quality, and high efficiency.

[0075] As an improvement to the technical solution, the present invention provides pressure sensors and speed sensors at the unwind roller or the output shaft of the unwind motor. The electrical signal output terminals of the pressure sensors and speed sensors 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 unwind motor, forming a closed-loop unwind control structure; the unwind tension control unit consists of an unwind tension motor and three unwind tension rollers. The three unwind tension rollers are arranged in a triangle, forming a three-stage straightening and adjustment structure; pressure sensors and speed sensors are provided at the output shaft of the unwind tension motor or at one of the unwind tension rollers. The electrical signal output terminals of the pressure sensors and speed sensors are 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 unwind tension motor, forming a closed-loop unwind tension control structure. Therefore, it is possible to accurately control the speed and tension of the workpiece (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip) to be constant before it enters the process section of the continuous annealing furnace, ensuring that the workpiece (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip) smoothly enters the inner loop conveyor 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 conveyor belt, featuring accurate unwind control of the workpiece (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip), good unwind quality of the workpiece and high efficiency.

[0076] As an improvement to the technical solution, the present invention provides pressure sensors and speed sensors at the wind-up roller and the output shaft of the wind-up motor. The electrical signal output terminals of the pressure sensors and speed sensors 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 wind-up motor, forming a closed-loop wind-up control structure; the wind-up tension control unit consists of a wind-up tension motor and four wind-up tension rollers. The four wind-up tension rollers are arranged in an "S" shape, forming a four-stage straightening and adjustment structure; pressure sensors and speed sensors are provided at the output shaft of the wind-up tension motor or at one of the wind-up tension rollers. The electrical signal output terminals of the pressure sensors and speed sensors are 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 wind-up tension motor, forming a closed-loop wind-up tension control structure. Therefore, it is possible to accurately control the speed and tension of the workpiece (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip) to be constant before it enters the wind-up roller of the wind-up unit, ensuring that the workpiece (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip) smoothly enters the wind-up roller of the wind-up unit, featuring accurate wind-up control of the product (metal thin strip, or copper thin strip, aluminum thin strip or stainless steel thin strip), good wind-up quality of the product workpiece and high efficiency.

[0077] In summary, the present invention mainly automatically eliminates the internal stress in the workpiece by applying a large tension (for example, a constant 3 - 6 tons) to the workpiece during the conveying process in the heat treatment of copper thin strip, aluminum thin strip or stainless steel thin strip. Since the present invention utilizes the large tension of the workpiece during the conveying process to eliminate the internal stress, only by setting a suitable roller type transmission structure and the tension control structure of this transmission structure, the purpose of eliminating the internal stress of the workpiece can be achieved, and there will be no vibration during the workpiece transmission process. Therefore, it can solve the problems in the prior art of metal thin strip heat treatment, such as complex equipment structure, high cost, or problems such as workpiece vibration, easy deformation of the workpiece, and poor stress elimination effect. It has prominent substantive features and remarkable technical progress, such as simple equipment structure, low cost, prevention of workpiece vibration, prevention of workpiece deformation, and good stress elimination effect. It is particularly suitable for the heat treatment of copper strip etching.

[0078] In addition, the materials applicable to the heat treatment of the present invention also include metal thin strips such as iron, stainless steel, aluminum, nickel, etc. Specification: thickness is 0.008 - 0.15 mm, width is 150 - 280 mm.

Claims

1. A method for eliminating stress in a thin metal strip during heat treatment, characterized in that : 1) A large-tension metal strip conveying mechanism is arranged in the heat treatment furnace for metal strips. During the process of conveying the workpiece, the tension maintained by this mechanism is 3 - 6 tons. 2) By controlling the tension of the large-tension metal strip conveying mechanism, the large tension borne by the workpiece is maintained at 3 - 6 tons. Utilize the large tension borne by the workpiece during the conveying process to eliminate the internal stress, that is, keep the tension borne by the workpiece constant at 3 - 6 tons during the conveying process to eliminate the internal stress of the workpiece when passing through the process section of the heat treatment furnace.

2. The method for eliminating stress of the thin metal strip during heat treatment according to claim 1, characterized in that The large-tension metal strip conveying mechanism includes an unwinding mechanism, a winding mechanism, and a tension control structure. The unwinding mechanism is arranged at the inlet end of the heat treatment furnace, and the winding mechanism is arranged at the outlet end of the heat treatment furnace. The unwinding mechanism and the winding mechanism are roller mechanisms. The control output end of the tension control mechanism is connected to the control input ends of the unwinding mechanism and the winding mechanism. By the tension control mechanism, the tension between the unwinding mechanism and the winding mechanism is kept constant at 3 - 6 tons to form a large-tension control structure.

3. The method for eliminating stress of the thin metal strip during heat treatment according to claim 1 or 2, characterized in that The metal strip is a copper strip, an aluminum strip, or a stainless steel strip.

4. The method for eliminating stress in a thin metal strip during heat treatment according to claim 1 or 2, characterized in that An internal circulation synchronous conveying structure is provided between the unwinding mechanism and the winding mechanism or in the process section of the heat treatment furnace. The internal circulation synchronous conveying structure is independent of the metal strip conveying mechanism and is synchronized with the metal strip conveying mechanism. The internal circulation synchronous conveying structure is composed of a transmission mechanism and an internal circulation steel belt connected. The transmission mechanism drives the internal circulation conveyor belt to continuously rotate synchronously, so that the internal circulation conveyor belt supports and drives the workpiece to pass through the process section of the heat treatment furnace synchronously with the transmission system, forming a workpiece conveying and supporting structure.

5. The stress relieving device for the method of relieving stress of the thin metal strip during heat treatment, comprising a heat treatment furnace and a control system, is characterized in that: It also includes a large-tension metal strip conveying mechanism, which includes an unwinding mechanism, a winding mechanism, and a tension control structure. The unwinding mechanism is arranged at the inlet end of the heat treatment furnace, and the winding mechanism is arranged at the outlet end of the heat treatment furnace. The unwinding mechanism and the winding mechanism are roller mechanisms. The control output end of the tension control mechanism is connected to the control input ends of the unwinding mechanism and the winding mechanism. By the tension control mechanism, the tension between the unwinding mechanism and the winding mechanism is 3 - 6 tons, forming a large-tension control structure. The signal input end of the tension control mechanism is connected to the signal output ends of the unwinding mechanism and the winding mechanism, forming a signal feedback structure. Through the signal feedback structure, a closed-loop control system is formed to control the tension of the workpiece during the conveying process to be constant at 3 - 6 tons, forming a large-tension conveying structure, so that the internal stress of the workpiece is eliminated when passing through the process section of the heat treatment furnace.

6. The device for eliminating stress in the heat treatment of the thin metal strip according to claim 5, comprising a heat treatment furnace and a control system, characterized in that: The unwinding mechanism consists of an unwinding unit (1) and an unwinding tension control unit (2) connected in series, with the unwinding unit (1) in the front and the unwinding tension control unit (2) in the rear; the winding mechanism includes a winding unit (11) and a winding tension control unit (12), and the winding unit (11) and the winding tension control unit (12) form a series structure, with the winding tension control unit (12) in the front and the winding unit (11) in the rear. After the workpiece is conveyed to the input end of the winding tension control unit (12), the tension and speed are controlled by the winding tension control unit (12), and finally it enters the winding unit (11); the tension control mechanism is composed of the unwinding tension control unit (2) and the winding tension control unit (12), and the tension of the workpiece during the conveying process is controlled by the tension control mechanism to be constantly 3 - 6 tons.

7. The device for eliminating stress in the heat treatment of the thin metal strip according to claim 5, characterized in that: The unwinding unit (1) consists of an unwinding motor and an unwinding roller (1-1). A pressure sensor and a speed sensor are arranged at the output shaft of the unwinding roller (1-1) or 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 a 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) consists 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 adjusting structure; a pressure sensor and a speed sensor are arranged 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; the winding unit (2) consists of a winding motor and a winding roller (12-1). A pressure sensor and a speed sensor are arranged at the output shaft of the winding roller (12-1) or the winding 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 winding motor, forming a closed-loop winding control structure; the winding tension control unit (11) consists of a winding tension motor (11-1) and four winding tension rollers (11-2). The four winding 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 winding tension motor (11-1) or one of the winding 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 winding tension motor (11-1), forming a closed-loop winding tension control structure; the closed-loop tension control structure is composed of the closed-loop unwinding tension control structure and the closed-loop winding tension control structure. The tension of the workpiece during the conveying process is controlled to be constant at 3-6 tons through the closed-loop tension control mechanism.

8. The device for eliminating stress in the heat treatment of the thin metal strip according to claim 5, characterized in that: 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; 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 guiding 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.

9. The device for eliminating stress in the heat treatment of the thin metal strip according to claim 5, characterized in that: An internal circulation synchronous transmission structure is provided in the process section of the heat treatment furnace. The internal circulation synchronous transmission structure is composed of a transmission mechanism (7) and an internal circulation steel belt (8). 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) also form turning rollers. 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 steel belt (8) just supports the workpiece. The two secondary shafts (7-2) are respectively arranged inside and below one main transmission shaft (7-1) to form a four-point support structure. The internal circulation transmission 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 provided 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) makes the speed of the internal circulation steel belt (8) synchronous with the forward speed of the workpiece by controlling the rotation speed of the transmission motor.

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