CN110670004B

CN110670004B - Continuous heat treatment production line for improving strength of aluminum alloy and working method thereof

Info

Publication number: CN110670004B
Application number: CN201910878550.6A
Authority: CN
Inventors: 陈路
Original assignee: Suzhou Qiaofeng Precision Machinery Co ltd
Current assignee: Suzhou Qiaofeng Precision Machinery Co ltd
Priority date: 2019-09-18
Filing date: 2019-09-18
Publication date: 2020-11-03
Anticipated expiration: 2039-09-18
Also published as: CN110670004A

Abstract

The invention discloses a continuous heat treatment production line for improving the strength of aluminum alloy and a working method, belonging to the technical field of clean production and deep processing of aluminum, copper, magnesium and titanium alloy. According to the continuous heat treatment production line, the reciprocating conveyor belt assembly is arranged, so that aluminum alloy can be subjected to annealing, quenching and aging treatment one by one without manual intervention, the system automatically performs corresponding treatment according to set time, manpower is saved, energy consumption is low, the hardness of the aluminum alloy obtained after treatment is high, the fracture strength of the aluminum alloy is improved, the damage resistance of the material is improved, and the comprehensive mechanical property of the aluminum alloy is improved.

Description

Continuous heat treatment production line for improving strength of aluminum alloy and working method thereof

Technical Field

The invention belongs to the technical field of clean production and deep processing of aluminum, copper, magnesium and titanium alloys, and particularly relates to a continuous heat treatment production line for improving the strength of an aluminum alloy. The invention also relates to a working method of the continuous heat treatment production line for improving the strength of the aluminum alloy.

Background

Aluminum alloys are a generic term for aluminum-based alloys. The main alloying elements are copper, silicon, magnesium, zinc and manganese, and the secondary alloying elements are nickel, iron, titanium, chromium, lithium and the like. Aluminum alloys are the most widely used class of non-ferrous structural materials in industry and have found a number of applications in the aerospace, automotive, mechanical manufacturing, marine and chemical industries. The aluminum alloy has advanced manufacturability and good welding function, the heat treatment can change the properties of metal and alloy, and the general aluminum alloy is required to improve the mechanical property and other properties through the heat treatment. The heat treatment process has very important significance. The application in the process of manufacturing parts can improve the quality of products and reduce the finished products of the products. Meanwhile, the heat treatment process can improve the corrosion resistance, increase the stability and improve the welding processing performance, and the aluminum alloy and the heat treatment process thereof have wide application in industry.

Because the aluminum alloy is sensitive to the change of the heat treatment temperature, the adjustment of the solid solution temperature and the aging temperature can generate larger influence on the mechanical property, the process control is slightly improper for products with strict requirements, the performance deviation can be caused to cause unqualified mechanical property, the products are reworked, the aluminum alloy products have strict requirements on the reworking times, the heat treatment can not be repeated for more than 2 times, and the unqualified products after the heat treatment for many times can only be scrapped, thereby causing great loss.

Disclosure of Invention

The purpose of the invention is as follows: in order to overcome the defects, the invention aims to provide a continuous heat treatment production line for improving the strength of aluminum alloy, and provides a set of working process for continuously carrying out heat treatment on the aluminum alloy. The invention also provides a working method of the continuous heat treatment production line for improving the strength of the aluminum alloy, which has the advantages of simple and feasible working principle, high automation degree of the working process, less manpower requirement, improvement of the production efficiency and suitability for industrial large-scale application.

The technical scheme is as follows: a continuous heat treatment production line for improving the strength of aluminum alloy comprises a platform, an annealing furnace, a quenching furnace, an aging cooling furnace, a reciprocating conveyor belt assembly and an aluminum alloy section conveying platform, wherein the annealing furnace, the quenching furnace and the aging cooling furnace are sequentially arranged according to production procedures, the annealing furnace, the quenching furnace and the aging cooling furnace are all covered outside the reciprocating conveying belt component, one end of the reciprocating conveying belt component extends out of the annealing furnace, the reciprocating conveyor belt assembly is arranged on the platform, the aluminum alloy section conveying platform is arranged on the reciprocating conveyor belt assembly, and the reciprocating conveyer belt component can drive the aluminum alloy section conveying platform to sequentially enter the annealing furnace, the quenching furnace and the aging cooling furnace, the two ends of the annealing furnace, the quenching furnace and the aging cooling furnace are both open structures along the conveying direction of the reciprocating conveying belt component, and automatic lifting doors are arranged at the two open ends of the annealing furnace, the quenching furnace and the aging cooling furnace.

Furthermore, foretell continuous type heat treatment production line of improvement aluminum alloy strength, the annealing stove includes annealing stove furnace body and a set of high temperature resistance wire, be equipped with a set of high temperature resistance wire on the inner wall of annealing stove furnace body, be equipped with high temperature resistant cellucotton on inside roof of annealing stove furnace body furnace and the lateral wall, be equipped with a set of high temperature resistant thermocouple on the annealing stove furnace body.

Furthermore, foretell continuous type heat treatment production line of improvement aluminum alloy intensity, the quenching furnace includes quenching furnace body, basin, water pipe, water pump, tuber pipe and a set of air outlet, the basin sets up in the space is established to the quenching furnace body cover to the basin is located the one end of the quenching furnace body that the platform is located, the water pump leads to pipe to be connected with the basin, be equipped with a set of water shower nozzle on the water pipe, the tuber pipe sets up on the roof of quenching furnace body, a set of air outlet sets up on the tuber pipe to a set of air outlet is located a set of water shower nozzle top.

Furthermore, according to the continuous heat treatment production line for improving the strength of the aluminum alloy, the aging cooling furnace comprises an aging cooling furnace body and a group of fans, and the group of fans are arranged on the top plate inside the aging cooling furnace body.

Furthermore, foretell continuous type heat treatment production line of improvement aluminum alloy intensity, reciprocating conveyer belt subassembly includes driving motor, reducing gear box, pivot, a set of pivot supporting seat, first chain drive unit and second chain drive unit set up on platform both sides inner wall to first chain drive unit and second chain drive unit symmetry set up, driving motor, reducing gear box and setting are on the platform, the pivot is erect on a set of pivot supporting seat, driving motor is connected with the reducing gear box, the reducing gear box is connected with the pivot, the both ends of pivot are connected with first chain drive unit and second chain drive unit respectively, first chain drive unit and second chain drive unit are connected with rectangular frame both sides wall respectively.

Further, foretell continuous type heat treatment production line of improvement aluminum alloy intensity, first chain drive unit and second chain drive unit include the action wheel, a set of follow driving wheel and drive chain, action wheel and a set of follow driving wheel all set up on the inner wall of platform, action wheel and pivot are connected, the drive chain cover is established at the action wheel and a set of follow driving wheel outside, action wheel and a set of follow driving wheel are located isosceles trapezoid's four bights, the last one side of keeping away from the platform inner wall of drive chain is equipped with the guide block, symmetric position is equipped with the guide block draw-in groove on two lateral walls of rectangular frame, the guide block sets up in the guide block draw-in groove.

Further, foretell continuous type heat treatment production line of improvement aluminum alloy intensity, be equipped with sensor unit on the inner wall of platform along drive chain transmission direction, tip, platform that the platform stretches out the annealing stove all are equipped with sensor unit in annealing stove department, platform are located quenching furnace department, platform are located ageing cooling furnace department, sensor unit is including the inductive sensor that targets in place, sensor and spacing sensor target in place, the last inductive switch that is equipped with of drive chain.

Further, in the continuous heat treatment production line for improving the strength of the aluminum alloy, the aluminum alloy section conveying platform comprises a rectangular frame, a grid plate and a group of rollers, the grid plate is arranged on the inner wall of the rectangular frame, the group of rollers is arranged on the lower end face of the rectangular frame, guide slide rails are arranged on the inner walls of the two sides of the platform, the group of rollers are arranged on the guide slide rails, and the rollers can reciprocate along the guide slide rails.

Furthermore, in the continuous heat treatment production line for improving the strength of the aluminum alloy, the automatic lifting door comprises a hydraulic cylinder and a lifting door body, and the lifting door body is erected on the hydraulic cylinder.

The invention also provides a working method of the continuous heat treatment production line for improving the strength of the aluminum alloy, which comprises the following steps:

1) placing the aluminum alloy section on an aluminum alloy section conveying platform;

2) the driving motor is started to drive the rotating shaft to rotate, so that the driving wheel is driven to rotate, the transmission chain is further driven to rotate, and the guide block moves synchronously along with the transmission chain;

3) the transmission chain drives the aluminum alloy section conveying platform to move along the guide sliding rail;

4) the aluminum alloy section conveying platform firstly enters an annealing furnace, an induction switch reaches an in-place induction sensor of the annealing furnace, a signal is sent to a control system, a driving motor starts to decelerate until the induction switch reaches the in-place sensor, and the aluminum alloy section conveying platform stops;

5) the automatic lifting doors at the two ends of the annealing furnace are closed, a group of high-temperature resistance wires start to heat through a control system to a set temperature and time, and the automatic lifting doors of the annealing furnace are opened;

6) repeating the step 2), and enabling the aluminum alloy section conveying platform to come out of the annealing furnace along with the movement of the reciprocating conveyor belt component and enter the quenching furnace;

7) repeating the step 4), so that the aluminum alloy section conveying platform stops in the quenching furnace, the automatic lifting doors at two ends of the quenching furnace are closed, the group of air outlets and the group of water outlet nozzles are started, the aluminum alloy sections on the aluminum alloy section conveying platform are respectively cooled by air and water from the upper part and the lower part, the set time and temperature are reached, and the automatic lifting doors of the quenching furnace are opened;

8) repeating the step 2), and enabling the aluminum alloy section conveying platform to come out of the quenching furnace along with the movement of the reciprocating conveyor belt component and enter the time-efficient cooling furnace;

9) repeating the step 4), so that the aluminum alloy section conveying platform is stopped in the aging cooling furnace, the automatic lifting doors with openings at two ends of the aging cooling furnace are closed, a group of fans are started to blow air to the aluminum alloy on the aluminum alloy section conveying platform, so that the surface of the aluminum alloy section is dried and reaches the set time and temperature, and the automatic lifting doors of the quenching furnace are opened;

10) the driving motor rotates reversely with the step 2) to drive the rotating shaft to rotate, so that the driving wheel is driven to rotate, the transmission chain is further driven to rotate, the guide block moves synchronously along with the transmission chain, the aluminum alloy section conveying platform returns to the initial position, the induction switch reaches the in-place induction sensor at the end part of the platform and sends a signal to the control system, the driving motor starts to decelerate, and the aluminum alloy section conveying platform stops until the induction switch reaches the in-place sensor, so that primary heat treatment is completed;

11) continuously repeating the steps 1) to 10) to continuously perform the heat treatment process of the aluminum alloy.

The working method of the continuous heat treatment production line for improving the strength of the aluminum alloy, disclosed by the invention, has the advantages of simple and feasible working principle, high automation degree of the working process, less manpower requirement, improvement on the production efficiency and suitability for industrial large-scale application.

The technical scheme shows that the invention has the following beneficial effects: the continuous heat treatment production line for improving the strength of the aluminum alloy has the advantages of simple structure, reasonable design and easy production, can carry out the three processes of annealing, quenching and aging treatment of the aluminum alloy one by one through the arrangement of the reciprocating conveyor belt assembly, does not need manual intervention, automatically carries out corresponding treatment by a system according to set time, saves manpower, has low energy consumption, has high hardness of the aluminum alloy obtained after treatment, improves the fracture strength of the aluminum alloy, improves the damage resistance of materials, and improves the comprehensive mechanical property of the aluminum alloy; the process mainly comprises annealing treatment, quenching treatment and aging treatment, wherein the treatment temperature and time are scientifically designed in each treatment link, so that the extensibility of the treated aluminum alloy is improved, the treatment energy consumption is reduced, and the process is simple.

Drawings

FIG. 1 is a schematic structural view of a continuous heat treatment line for improving strength of an aluminum alloy according to the present invention;

FIG. 2 is a schematic view showing the structure of an annealing furnace according to the present invention;

FIG. 3 is a schematic structural view of a quenching furnace according to the present invention;

FIG. 4 is a schematic structural diagram of an aging cooling furnace according to the present invention;

FIG. 5 is a schematic structural view of the aluminum alloy profile conveying platform of the present invention;

FIG. 6 is a first schematic view of the construction of the reciprocating conveyor belt assembly of the present invention;

FIG. 7 is a second schematic structural view of the reciprocating belt assembly of the present invention;

FIG. 8 is a front view of the reciprocating belt assembly of the present invention;

FIG. 9 is an enlarged fragmentary view of the reciprocating conveyor belt assembly of the present invention;

fig. 10 is a schematic structural view of the connection between the guide block and the guide block clamping groove.

In the figure: platform 1, guide slide rail 11, chain support plate 12, in-place induction sensor 13, in-place sensor 14, limit sensor 15, quenching furnace body 2, reciprocating conveyer belt assembly 4, driving motor 41, reduction box 42, rotating shaft 43, rotating shaft support seat 44, first chain transmission unit 45, driving wheel 451, driven wheel 452, transmission chain 453, guide block 454, induction switch 455, second chain transmission unit 46, aluminum alloy section bar conveying platform 5 and rectangular frame 51, the device comprises a grid plate 52, a roller 53, a guide block clamping groove 54, a water tank 6, a water pipe 7, a water outlet nozzle 71, a water pump 8, an air pipe 9, an air outlet 10, a quenching furnace 20, an aging cooling furnace 30, an annealing furnace 70, an automatic lifting door 60, an annealing furnace body 101, a high-temperature resistance wire 102, high-temperature resistant fiber cotton 103, a high-temperature resistant thermocouple 104, an aging cooling furnace body 301, a fan 302, a hydraulic cylinder 601 and a lifting door body 602.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, unless otherwise specified, "a plurality" means two or more unless explicitly defined otherwise.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

Examples

The continuous heat treatment production line for improving the strength of the aluminum alloy shown in fig. 1 comprises a platform 1, an annealing furnace 70, a quenching furnace 20, an aging cooling furnace 30, a reciprocating conveyer belt assembly 4 and an aluminum alloy section conveying platform 5, wherein the annealing furnace 70, the quenching furnace 20 and the aging cooling furnace 30 are sequentially arranged according to production procedures, the annealing furnace 70, the quenching furnace 20 and the aging cooling furnace 30 are all covered outside the reciprocating conveyer belt assembly 4, one end of the reciprocating conveyer belt assembly 4 extends out of the annealing furnace 70, the reciprocating conveyer belt assembly 4 is arranged on the platform 1, the aluminum alloy section conveying platform 5 is arranged on the reciprocating conveyer belt assembly 4, the reciprocating conveyer belt assembly 4 can drive the aluminum alloy section conveying platform 5 to sequentially pass through the annealing furnace 70, the quenching furnace 20 and the aging cooling furnace 30, and both ends of the annealing furnace 70, the quenching furnace 20 and the aging cooling furnace 30 are both in an open structure along the conveying direction of, the open two ends of the annealing furnace 70, the quenching furnace 20 and the aging cooling furnace 30 are provided with automatic lifting doors 60. The automatic lifting door 60 includes a hydraulic cylinder 601 and a lifting door body 602, and the lifting door body 602 is erected on the hydraulic cylinder 601.

The annealing furnace 70 shown in fig. 2 comprises an annealing furnace body 101 and a group of high-temperature resistance wires 102, wherein the group of high-temperature resistance wires 102 is arranged on the inner wall of the annealing furnace body 101, high-temperature resistant fiber cotton 103 is arranged on the top plate and the side wall inside the hearth of the annealing furnace body 101, and a group of high-temperature resistant thermocouples 104 is arranged on the annealing furnace body 101.

The quenching furnace 20 shown in fig. 3 comprises a quenching furnace body 2, a water tank 6, a water pipe 7, a water pump 8, an air pipe 9 and a group of air outlets 10, wherein the water tank 6 is arranged in a space covered by the quenching furnace body 2, the water tank 6 is positioned in one end of the quenching furnace body 2 where the platform 1 is positioned, the water pump 8 is connected with the water tank 6 through the water pipe 7, the water pipe 7 is provided with a group of water outlet nozzles 71, the air pipe 9 is arranged on a top plate of the quenching furnace body 2, the group of air outlets 10 are arranged on the air pipe 9, and the group of air outlets 10 are positioned above the group of water outlet nozzles 71. The quenching furnace with the structure has the advantages that the set of water outlet spray heads and the set of air outlets are respectively arranged above and below the aluminum alloy section conveying platform, air cooling and water cooling are respectively carried out on the aluminum alloy sections, the cooling capacity is stronger and more uniform, the online quenching requirement of large-size products can be met, the production period is shortened, the manpower and material resource investment is saved, the energy loss is lower, the energy-saving and efficiency-increasing effects are obvious, the extrusion quality and the production efficiency of the aluminum alloy sections are improved, the cost is saved for enterprises, and the benefits are increased.

The aging cooling furnace 30 shown in fig. 4 includes an aging cooling furnace body 301 and a set of fans 302, and the set of fans 302 is disposed on a top plate inside the aging cooling furnace body 301.

The reciprocating conveyor belt assembly 4 shown in fig. 6-10 comprises a driving motor 41, a reduction box 42, a rotating shaft 43, a set of rotating shaft supporting seats 44, a first chain transmission unit 45 and a second chain transmission unit 46, the first chain transmission unit 45 and the second chain transmission unit 46 are provided on both side inner walls of the platform 1, and the first chain transmission unit 45 and the second chain transmission unit 46 are symmetrically arranged, the driving motor 41, the reduction gearbox 42 are arranged on the platform 1, the rotating shaft 43 is arranged on a group of rotating shaft supporting seats 44, the driving motor 41 is connected with the reduction gearbox 42, the reduction box 42 is connected with a rotating shaft 43, two ends of the rotating shaft 43 are respectively connected with a first chain transmission unit 45 and a second chain transmission unit 46, the first chain transmission unit 45 and the second chain transmission unit 46 are connected to both side walls of the rectangular frame 51, respectively. The first chain transmission unit 45 and the second chain transmission unit 46 include a driving wheel 451, a set of driven wheels 452 and a transmission chain 453, the driving wheel 451 and the set of driven wheels 452 are both disposed on the inner wall of the platform 1, the driving wheel 451 is connected with the rotating shaft 43, the transmission chain 453 is sleeved outside the driving wheel 451 and the set of driven wheels 452, the driving wheel 451 and the set of driven wheels 452 are located on four corners of an isosceles trapezoid, a guide block 454 is disposed on one side of the transmission chain 453 away from the inner wall of the platform 1, guide block slots 54 are symmetrically disposed on two outer side walls of the rectangular frame 51, and the guide block 454 is disposed in the guide block slot 54. In addition, sensor units are arranged on the inner wall of the platform 1 along the transmission direction of the transmission chain 453, the sensor units are arranged at the end part of the platform 1 extending out of the annealing furnace 70, the platform 1 is positioned at the quenching furnace 20, and the platform 1 is positioned at the aging cooling furnace 30, the sensor units comprise an in-place induction sensor 13, an in-place sensor 14 and a limit sensor 15, and the transmission chain 453 is provided with an induction switch 455.

The aluminum alloy profile conveying platform 5 shown in fig. 5 comprises a rectangular frame 51, a grid plate 52 and a group of rollers 53, wherein the grid plate 52 is arranged on the inner wall of the rectangular frame 51, the group of rollers 53 is arranged on the lower end face of the rectangular frame 51, guide slide rails 11 are arranged on the inner walls of two sides of the platform 1, the group of rollers 53 is arranged on the guide slide rails 11, and the rollers 53 can reciprocate along the guide slide rails 11.

Based on the structure, the working method of the continuous heat treatment production line for improving the strength of the aluminum alloy comprises the following steps:

1) placing the aluminum alloy section on the aluminum alloy section conveying platform 5;

2) the driving motor 41 is started to drive the rotating shaft 43 to rotate, so as to drive the driving wheel 451 to rotate, further drive the transmission chain 453 to rotate, and the guide block 454 moves synchronously with the transmission chain 453;

3) the transmission chain 453 drives the aluminum alloy section conveying platform 5 to move along the guide slide rail 11;

4) the aluminum alloy section conveying platform 5 firstly enters the annealing furnace 70, the induction switch 455 reaches the in-place induction sensor 13 of the annealing furnace 70, a signal is sent to the control system, the driving motor 41 starts to decelerate until the induction switch 455 reaches the in-place sensor 14, and the aluminum alloy section conveying platform 5 stops;

5) the automatic lifting doors 60 with openings at the two ends of the annealing furnace 70 are closed, a group of high-temperature resistance wires 102 start to be heated through a control system to a set temperature and time, and the automatic lifting doors 60 of the annealing furnace 70 are opened;

6) repeating the step 2), and enabling the aluminum alloy section conveying platform 5 to come out of the annealing furnace 70 along with the movement of the reciprocating conveyer belt assembly 4 and enter the quenching furnace 20;

7) repeating the step 4), so that the aluminum alloy section conveying platform 5 is stopped in the quenching furnace 20, the automatic lifting doors 60 at the two ends of the quenching furnace 20 are closed, the group of air outlets 10 and the group of water outlet nozzles 71 are started, the aluminum alloy sections on the aluminum alloy section conveying platform 5 are respectively cooled by air and water from the upper part and the lower part, the set time and temperature are reached, and the automatic lifting doors 60 of the quenching furnace 20 are opened;

8) repeating the step 2), and enabling the aluminum alloy section conveying platform 5 to come out of the quenching furnace 20 along with the movement of the reciprocating conveyer belt assembly 4 and enter the aging cooling furnace 30;

9) repeating the step 4), so that the aluminum alloy section conveying platform 5 is stopped in the aging cooling furnace 30, the automatic lifting doors 60 with openings at two ends of the aging cooling furnace 30 are closed, the group of fans 302 are started to blow the aluminum alloy on the aluminum alloy section conveying platform 5, so that the surface of the aluminum alloy section is dried and reaches the set time and temperature, and the automatic lifting doors 60 of the quenching furnace 20 are opened;

10) the driving motor 41 rotates reversely with the step 2) to drive the rotating shaft 43 to rotate, so as to drive the driving wheel 451 to rotate and further drive the transmission chain 453 to rotate, the guide block 454 moves synchronously with the transmission chain 453 to return the aluminum alloy section conveying platform 5 to the initial position, the induction switch 455 reaches the in-place induction sensor 13 at the end of the platform and sends a signal to the control system, the driving motor 41 starts to decelerate until the induction switch 455 reaches the in-place sensor 14, the aluminum alloy section conveying platform 5 stops, and one-time heat treatment is completed;

The foregoing is only a preferred embodiment of the present invention, and it should be noted that modifications can be made by those skilled in the art without departing from the principle of the present invention, and these modifications should also be construed as the protection scope of the present invention.

Claims

1. The utility model provides an improve continuous type heat treatment production line of aluminum alloy intensity which characterized in that: comprises a platform (1), an annealing furnace (70), a quenching furnace (20), an aging cooling furnace (30), a reciprocating conveying belt assembly (4) and an aluminum alloy section conveying platform (5), wherein the annealing furnace (70), the quenching furnace (20) and the aging cooling furnace (30) are sequentially arranged according to production procedures, the annealing furnace (70), the quenching furnace (20) and the aging cooling furnace (30) are all covered outside the reciprocating conveying belt assembly (4), one end of the reciprocating conveying belt assembly (4) extends out of the annealing furnace (70), the reciprocating conveying belt assembly (4) is arranged on the platform (1), the aluminum alloy section conveying platform (5) is arranged on the reciprocating conveying belt assembly (4), and the reciprocating conveying belt assembly (4) can drive the aluminum alloy section conveying platform (5) to sequentially pass through the annealing furnace (70), the quenching furnace (20) and the aging cooling furnace (30), two ends of the annealing furnace (70), the quenching furnace (20) and the aging cooling furnace (30) are all in an open structure along the conveying direction of the reciprocating conveyor belt component (4), and two open ends of the annealing furnace (70), the quenching furnace (20) and the aging cooling furnace (30) are provided with automatic lifting doors (60);

the reciprocating conveyor belt assembly (4) comprises a driving motor (41), a reduction gearbox (42), a rotating shaft (43), a group of rotating shaft supporting seats (44), a first chain transmission unit (45) and a second chain transmission unit (46), wherein the first chain transmission unit (45) and the second chain transmission unit (46) are arranged on the inner walls of the two sides of the platform (1), the first chain transmission unit (45) and the second chain transmission unit (46) are symmetrically arranged, the driving motor (41), the reduction gearbox (42) and the platform (1) are arranged on the platform, the rotating shaft (43) is erected on the group of rotating shaft supporting seats (44), the driving motor (41) is connected with the reduction gearbox (42), the reduction gearbox (42) is connected with the rotating shaft (43), the two ends of the rotating shaft (43) are respectively connected with the first chain transmission unit (45) and the second chain transmission unit (46), the first chain transmission unit (45) and the second chain transmission unit (46) are respectively connected with two side walls of the rectangular frame (51);

the first chain transmission unit (45) and the second chain transmission unit (46) comprise a driving wheel (451), a group of driven wheels (452) and a transmission chain (453), the driving wheel (451) and the group of driven wheels (452) are arranged on the inner wall of the platform (1), the driving wheel (451) is connected with the rotating shaft (43), the transmission chain (453) is sleeved outside the driving wheel (451) and the group of driven wheels (452), the driving wheel (451) and the group of driven wheels (452) are located on four corners of an isosceles trapezoid, a guide block (454) is arranged on one side, far away from the inner wall of the platform (1), of the transmission chain (453), guide block clamping grooves (54) are symmetrically arranged on two outer side walls of the rectangular frame (51), and the guide block (454) is arranged in the guide block clamping groove (54);

a sensor unit is arranged on the inner wall of the platform (1) along the transmission direction of the transmission chain (453), the end part of the platform (1) extending out of the annealing furnace (70), the platform (1) positioned at the quenching furnace (20) and the platform (1) positioned at the aging cooling furnace (30) are provided with the sensor units, the sensor units comprise an in-place induction sensor (13), an in-place sensor (14) and a limit sensor (15), and the transmission chain (453) is provided with an induction switch (455);

the aluminum alloy profile conveying platform (5) comprises a rectangular frame (51), a grid plate (52) and a group of rollers (53), the grid plate (52) is arranged on the inner wall of the rectangular frame (51), the group of rollers (53) is arranged on the lower end face of the rectangular frame (51), guide sliding rails (11) are arranged on the inner walls of the two sides of the platform (1), the group of rollers (53) are arranged on the guide sliding rails (11), and the rollers (53) can reciprocate along the guide sliding rails (11).

2. The continuous heat treatment production line for improving the strength of the aluminum alloy according to claim 1, characterized in that: the annealing furnace (70) comprises an annealing furnace body (101) and a group of high-temperature resistance wires (102), wherein the group of high-temperature resistance wires (102) are arranged on the inner wall of the annealing furnace body (101), high-temperature resistant cellucotton (103) are arranged on the top plate and the side wall inside a hearth of the annealing furnace body (101), and a group of high-temperature resistant thermocouples (104) are arranged on the annealing furnace body (101).

3. The continuous heat treatment production line for improving the strength of the aluminum alloy according to claim 1, characterized in that: the quenching furnace (20) comprises a quenching furnace body (2), a water tank (6), a water pipe (7), a water pump (8), an air pipe (9) and a group of air outlets (10), wherein the water tank (6) is arranged in a space covered by the quenching furnace body (2), the water tank (6) is arranged in one end of the quenching furnace body (2) where the platform (1) is located, the water pump (8) is connected with the water tank (6) through the water pipe (7), a group of water outlet spray nozzles (71) are arranged on the water pipe (7), the air pipe (9) is arranged on a top plate of the quenching furnace body (2), the group of air outlets (10) are arranged on the air pipe (9), and the group of air outlets (10) are arranged above the group of water outlet spray nozzles (71).

4. The continuous heat treatment production line for improving the strength of the aluminum alloy according to claim 1, characterized in that: the aging cooling furnace (30) comprises an aging cooling furnace body (301) and a set of fans (302), wherein the set of fans (302) are arranged on a top plate inside the aging cooling furnace body (301).

5. The continuous heat treatment production line for improving the strength of the aluminum alloy according to claim 1, characterized in that: the automatic lifting door (60) comprises a hydraulic cylinder (601) and a lifting door body (602), and the lifting door body (602) is erected on the hydraulic cylinder (601).

6. A working method of a continuous heat treatment production line for improving the strength of aluminum alloy is characterized in that: the method comprises the following steps:

1) placing the aluminum alloy section on the aluminum alloy section conveying platform (5);

2) the driving motor (41) is started to drive the rotating shaft (43) to rotate, so that the driving wheel (451) is driven to rotate, the transmission chain (453) is further driven to rotate, and the guide block (454) moves synchronously along with the transmission chain (453);

3) the transmission chain (453) drives the aluminum alloy section conveying platform (5) to move along the guide sliding rail (11);

4) the aluminum alloy section conveying platform (5) firstly enters the annealing furnace (70), the induction switch (455) reaches the in-place induction sensor (13) of the annealing furnace (70), a signal is sent to the control system, the driving motor (41) starts to decelerate until the induction switch (455) reaches the in-place sensor (14), and the aluminum alloy section conveying platform (5) stops;

5) the automatic lifting door (60) with openings at two ends of the annealing furnace (70) is closed, a group of high-temperature resistance wires (102) starts to be heated through a control system to a set temperature and time, and the automatic lifting door (60) of the annealing furnace (70) is opened;

6) repeating the step 2), and enabling the aluminum alloy section conveying platform (5) to move out of the annealing furnace (70) along with the movement of the reciprocating conveyor belt assembly (4) and enter the quenching furnace (20);

7) repeating the step 4), so that the aluminum alloy section conveying platform (5) stops in the quenching furnace (20), the automatic lifting doors (60) with openings at two ends of the quenching furnace (20) are closed, the group of air outlets (10) and the group of water outlet nozzles (71) are started, the aluminum alloy sections on the aluminum alloy section conveying platform (5) are respectively cooled by air and water from the upper part and the lower part, the set time and temperature are reached, and the automatic lifting doors (60) of the quenching furnace (20) are opened;

8) repeating the step 2), and enabling the aluminum alloy section conveying platform (5) to come out of the quenching furnace (20) along with the movement of the reciprocating conveyor belt assembly (4) and enter the effective cooling furnace (30);

9) repeating the step 4), so that the aluminum alloy section conveying platform (5) stops in the aging cooling furnace (30), the automatic lifting doors (60) with openings at two ends of the aging cooling furnace (30) are closed, the group of fans (302) are started to blow aluminum alloy on the aluminum alloy section conveying platform (5), so that the surface of the aluminum alloy section is dried and reaches the set time and temperature, and the automatic lifting doors (60) of the quenching furnace (20) are opened;

10) the driving motor (41) rotates reversely with the step 2) to drive the rotating shaft (43) to rotate, so that the driving wheel (451) is driven to rotate, the transmission chain (453) is further driven to rotate, the guide block (454) moves synchronously with the transmission chain (453), the aluminum alloy section conveying platform (5) returns to the initial position, the induction switch (455) reaches the in-place induction sensor (13) at the end of the platform and sends a signal to the control system, the driving motor (41) starts to decelerate until the induction switch (455) reaches the in-place sensor (14), the aluminum alloy section conveying platform (5) stops, and primary heat treatment is completed;