Large-caliber quartz tube annealing device and annealing method

Abstract

The present invention discloses a large-diameter quartz tube annealing device and an annealing method, which include an annealing furnace, a quartz tube rack, and a conveyor belt. One end of the annealing furnace is provided with a feed inlet, and the other end is provided with a discharge outlet. The conveyor belt includes a feed conveyor belt, an in-furnace conveyor belt, and a blanking conveyor belt arranged in sequence. The quartz tube rack includes a frame body, and a number of placement stations are provided on the frame body. A number of rotating shafts are provided on the placement stations, and a number of support wheels are fixedly connected to the rotating shafts. The feed inlet and the discharge outlet are respectively covered with a box cover, and the upper end of the box cover is hinged to the annealing furnace. The large-diameter quartz tube annealing device and the annealing method of the present invention can anneal multiple large-diameter quartz tubes simultaneously. During the annealing process, the large-diameter quartz tubes can rotate automatically, avoiding uneven annealing temperature of the quartz tubes caused by low temperature at the contact point positions, ensuring the annealing effect, and effectively removing the internal stress of the material. The large-diameter quartz tubes can enter and exit the annealing furnace conveniently, avoiding bumps and knocks.

Description

Technical Field

[0001] The present invention belongs to the technical field of quartz tube annealing, and particularly relates to an annealing device for large-diameter quartz tubes. Background Art

[0002] Quartz tubes are extremely widely used and are materials required for house decoration, heaters, microwave ovens, electric ovens, disinfection cabinets, infrared baking rooms, painting machines, powder coating baking rooms, various drying rooms and drying tunnels. During the processing and manufacturing of quartz tubes, it is often necessary to connect some branch pipes to the tube body. The connection process is to melt the corresponding parts of the tube body and the branch pipes for welding. At the same time, quartz tubes may also need to be machined, such as cutting. Whether it is welding or machining, stress will be left in the quartz tube, and annealing treatment is required to eliminate these stresses. Small quartz tubes can be directly placed in an annealing furnace for annealing according to the set process. However, for large-diameter quartz tubes, due to their large volume and heavy weight, when annealing in the existing annealing furnace, there are problems such as inconvenient loading and unloading and easy bumping, and it is also easy to have uneven temperature distribution, resulting in uneven heating of the large-diameter quartz tube and poor stress elimination effect. Summary of the Invention

[0003] To solve the above technical problems, the technical solution adopted by the present invention is: an annealing device for large-diameter quartz tubes, including an annealing furnace, a quartz tube rack, and a conveyor belt. The annealing furnace includes a furnace chamber, in which a heating device and a temperature sensing device are installed. One end of the annealing furnace is provided with a feed port communicating with the furnace chamber, and the other end is provided with a discharge port communicating with the furnace chamber. The conveyor belt includes a feed conveyor belt, an in-furnace conveyor belt, and a blanking conveyor belt arranged in sequence. The in-furnace conveyor belt is located at the bottom of the furnace chamber and its two ends are respectively close to the feed port and the discharge port. One end of the feed conveyor belt is close to the feed port, and one end of the blanking conveyor belt is close to the discharge port. The quartz tube rack includes a rack body, and a number of placement stations are provided on the rack body. Each placement station is used to place a quartz tube. A number of rotating shafts are provided on the placement station, and a number of support wheels are fixedly connected to the rotating shafts. The rotating shafts are respectively rotatably installed on the rack body. The rotating shafts on each placement station are sequentially arranged around the corresponding quartz tube. The feed port and the discharge port are respectively covered with a box cover, and the upper end of the box cover is hinged to the annealing furnace.

[0004] As a preference of the above technical solution, one of the rotating shafts in each placement station is set as a driving shaft, and a runner for driving all the driving shafts on the same rack body to rotate is installed on the rack body. The runner and the driving shaft are respectively connected by a synchronous belt or a chain. A driving wheel is installed in the furnace chamber, and the driving wheel is driven to rotate by a driving motor. The driving wheel is driven to descend or ascend by a lifting cylinder.

[0005] Preferably, as the above technical solution, the number of rotating shafts in each of the placement stations is 4. Two of the rotating shafts are located at the lower end of the placement station, and the other two rotating shafts are located at the upper end of the placement station. The rotating shafts at the lower end of the placement station are connected to the frame through fixed rods. The upper end of the fixed rod is connected to the corresponding rotating shaft through a bearing, and the lower end of the fixed rod is fixedly connected to the frame. The rotating shafts at the upper end of the placement station are connected to the frame through movable rods. The upper end of the movable rod is rotatably connected to the frame, and the lower end of the movable rod is connected to the corresponding rotating shaft through a bearing.

[0006] Preferably, as the above technical solution, the interior of the furnace cavity is successively divided into a preheating cavity, an annealing cavity, and a cooling cavity by two lifting partitions. Slide rails are respectively installed on both sides of the lifting partitions. Sliders are installed on the slide rails, and the sliders are fixedly connected to the annealing furnace. A rack is fixedly connected to the lifting partition. Two lifting motors are installed at the upper end of the annealing furnace. The driving shafts of the lifting motors are connected with lifting gears, and the lifting gears are respectively engaged with the rack. The number of driving wheels is three, and the three driving wheels are respectively driven to rotate by a driving motor. The three driving wheels are respectively installed in the preheating cavity, the annealing cavity, and the cooling cavity.

[0007] Preferably, as the above technical solution, the conveyor belt inside the furnace is divided into a front conveyor belt, a middle conveyor belt, and a rear conveyor belt. The front conveyor belt is located in the preheating cavity, the middle conveyor belt is located in the annealing cavity, and the rear conveyor belt is located in the cooling cavity.

[0008] The annealing method for large-diameter quartz tubes uses the above annealing device and includes the following steps:

[0009] Step 1: Place the large-diameter quartz tubes on the placement stations in the quartz tube rack in sequence.

[0010] Step 2: Push the quartz tube rack into the preheating cavity to preheat the quartz tubes in the quartz tube rack. During the preheating process, the driving wheels in the preheating cavity are driven to rotate by the driving motor, driving all the quartz tubes in the quartz tube rack to rotate.

[0011] Step 3: After the preheating is completed, push the quartz tube rack into the annealing cavity for annealing according to the set annealing process. During the annealing process, the driving wheels in the annealing cavity are driven to rotate by the driving motor, driving all the quartz tubes in the quartz tube rack to rotate.

[0012] Step 4: After the annealing is completed, pull the quartz tube rack into the cooling cavity for cooling. During the cooling process, the driving wheels in the cooling cavity are driven to rotate by the driving motor, driving all the quartz tubes in the quartz tube rack to rotate.

[0013] As an optimization of the above technical solution, before the annealing starts, the temperature in the preheating chamber is raised to 300 - 350 °C, the temperature in the annealing chamber is raised to 600 - 650 °C, and the temperature in the cooling chamber is raised to 200 - 250 °C; open the box cover, push the quartz tube rack into the preheating chamber, close the box cover, and keep it warm for at least 1 hour; raise the lifting partition between the preheating chamber and the annealing chamber, push the quartz tube rack into the annealing chamber, and then lower the lifting partition; keep the temperature at 600 - 650 °C in the annealing chamber for at least 1 hour, then raise the temperature to 1150 - 1250 °C and keep it warm for 0.5 - 1 hour; raise the lifting partition between the annealing chamber and the cooling chamber, and pull the quartz tube rack in the annealing chamber into the cooling chamber; after keeping it warm for at least 1 hour at a temperature of 200 - 250 °C in the cooling chamber, open the box cover, take out the quartz tube rack in the cooling chamber, and complete the annealing.

[0014] The beneficial effects of the present invention are as follows: The annealing device and method for large-diameter quartz tubes of the present invention can anneal multiple large-diameter quartz tubes simultaneously. During the annealing process, the large-diameter quartz tubes can rotate automatically, avoiding uneven annealing temperature of the quartz tubes caused by low temperature at the contact point positions, ensuring the annealing effect, and effectively removing the internal stress of the material. The large-diameter quartz tubes can enter and exit the annealing furnace conveniently, avoiding bumps. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a schematic structural diagram of the present invention;

[0016] Figure 2 is a partial structural diagram of the quartz tube rack;

[0017] Figure 3 is a structural diagram of the rotating shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0018] The technical solution of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0019] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0020] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "installed", "connected", and "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0021] As Figures 1-3 shown, a large-diameter quartz tube annealing device includes an annealing furnace 1, a quartz tube rack 2, and a conveyor belt. The annealing furnace 1 includes a furnace cavity, in which a heating device and a temperature sensing device are installed. One end of the annealing furnace 1 is provided with a feed inlet 3 communicating with the furnace cavity, and the other end is provided with a discharge outlet 4 communicating with the furnace cavity. The conveyor belt includes a feed conveyor belt 5, an in-furnace conveyor belt, and a blanking conveyor belt 7 arranged in sequence. The in-furnace conveyor belt is located at the bottom of the furnace cavity and its two ends are respectively close to the feed inlet 3 and the discharge outlet 4. One end of the feed conveyor belt 5 is close to the feed inlet 3, and one end of the blanking conveyor belt 7 is close to the discharge outlet 4. The quartz tube rack 2 includes a rack body, on which a plurality of placement stations 6 are provided. Each placement station 6 is used to place a quartz tube 8. A plurality of rotating shafts 9 are provided on the placement station 6, and a plurality of support wheels 10 are fixedly connected to the rotating shafts 9. The rotating shafts 9 are respectively rotatably installed on the rack body. The rotating shafts 9 on each placement station 6 are sequentially arranged around the corresponding quartz tube 8. The feed inlet 3 and the discharge outlet 4 are respectively covered with a box cover 11, and the upper end of the box cover 11 is hinged to the annealing furnace 1.

[0022] Furthermore, one of the rotating shafts 9 in each placement station 6 is set as a driving shaft 12. A runner 13 for driving all the driving shafts 12 on the same rack body to rotate is installed on the rack body. The runner 13 and the driving shafts 12 are respectively connected by a synchronous belt or a chain. A driving wheel 14 is installed in the furnace cavity, and the driving wheel 14 is driven to rotate by a driving motor. The driving wheel 14 is driven to descend or ascend by a lifting cylinder.

[0023] Further, the number of rotating shafts 9 in each placement station 6 is 4. Two of the rotating shafts 9 are located at the lower end of the placement station 6, and the other two rotating shafts 9 are located at the upper end of the placement station 6. The rotating shafts 9 at the lower end of the placement station 6 are connected to the frame through fixing rods 15. The upper end of the fixing rod 15 is connected to the corresponding rotating shaft 9 through a bearing, and the lower end of the fixing rod 15 is fixedly connected to the frame. The rotating shafts 9 at the upper end of the placement station 6 are connected to the frame through movable rods 16. The upper end of the movable rod 16 is rotatably connected to the frame, and the lower end of the movable rod 16 is connected to the corresponding rotating shaft 9 through a bearing. The rotating shafts 9 connected to the frame through the fixing rods 15 play a supporting role and bear the weight of the quartz tube. The rotating shafts 9 connected to the movable rods 16 play a protective role on the side of the quartz tube, can adjust the position according to the size of the quartz tube, and at the same time facilitate the insertion and removal of the quartz tube.

[0024] Further, the interior of the furnace cavity is sequentially divided into a preheating cavity 18, an annealing cavity 19, and a cooling cavity 20 by two lifting partition plates 17. Slide rails are installed on both sides of the lifting partition plates 17, and sliders are installed on the slide rails. The sliders are fixedly connected to the annealing furnace 1. A rack is fixedly connected to the lifting partition plate 17. Two lifting motors 21 are installed at the upper end of the annealing furnace 1. The drive shafts of the lifting motors 21 are connected to lifting gears 22. The lifting gears 22 are respectively engaged with the rack. The number of driving wheels 14 is three. The three driving wheels 14 are respectively driven to rotate by a driving motor. The three driving wheels 14 are respectively installed in the preheating cavity 18, the annealing cavity 19, and the cooling cavity 20. The quartz tube is preheated to a certain temperature in the preheating cavity 18. The heat overflowing when the lifting partition plate 17 is switched in the annealing cavity 19 can enter the preheating cavity 18 or the cooling cavity 20, making full use of energy. At the same time, the existence of the preheating cavity 18 and the cooling cavity 20 enables the temperature in the annealing cavity 19 to be stabilized within a certain range when the lifting partition plate 17 is switched, without large temperature difference changes, which is suitable for continuous annealing operations. After the quartz tube rack 2 reaches the preheating cavity 18, the annealing cavity 19, and the cooling cavity 20, the corresponding driving wheels 14 rise and engage with the rotating wheels 13, driving the rotating wheels 13 to rotate. The rotating wheels 13 then drive all the driving shafts 12 to rotate, causing the quartz tube to rotate in the placement station 6 and be evenly heated. In order to ensure that the driving wheels 14 can be well engaged with the rotating wheels 13 after rising, a limiting baffle can be provided above the quartz tube rack 2 to block the quartz tube rack 2 when the quartz tube rack 2 is jacked up, so that the driving wheels 14 and the rotating wheels 13 can be tightly engaged.

[0025] Further, the conveyor belt inside the furnace is divided into a front conveyor belt 23, a middle conveyor belt 24, and a rear conveyor belt 25. The front conveyor belt 23 is located in the preheating chamber 18, the middle conveyor belt 24 is located in the annealing chamber 19, and the rear conveyor belt 25 is located in the cooling chamber 20. Each conveyor belt is a power conveyor belt, that is, the front conveyor belt 23, the middle conveyor belt 24, and the rear conveyor belt 25 can be independently controlled to operate. Through the cooperation of the front conveyor belt 23, the middle conveyor belt 24, and the rear conveyor belt 25, the quartz tube rack 2 can be automatically conveyed inside the furnace. In order to improve the degree of automation of the conveying process, several sensors for sensing the position of the quartz tube rack 2 can be arranged inside the furnace, and the position information of the quartz tube rack 2 is obtained through the sensors to control the start and stop of each conveyor belt.

[0026] The annealing method for large-diameter quartz tubes includes the following steps:

[0027] Step 1, sequentially place the large-diameter quartz tubes 8 on the placement stations 6 in the quartz tube rack 2;

[0028] Step 2, push the quartz tube rack 2 into the preheating chamber 18 to preheat the quartz tubes 8 in the quartz tube rack 2. During the preheating process, the driving wheel 14 in the preheating chamber 18 is driven by a driving motor to rotate, driving all the quartz tubes 8 in the quartz tube rack 2 to rotate;

[0029] Step 3, after the preheating is completed, push the quartz tube rack 2 into the annealing chamber 19 for annealing according to the set annealing process. During the annealing process, the driving wheel 14 in the annealing chamber 19 is driven by a driving motor to rotate, driving all the quartz tubes 8 in the quartz tube rack 2 to rotate;

[0030] Step 4, after the annealing is completed, pull the quartz tube rack 2 into the cooling chamber 20 for cooling. During the cooling process, the driving wheel 14 in the cooling chamber 20 is driven by a driving motor to rotate, driving all the quartz tubes 8 in the quartz tube rack 2 to rotate.

[0031] As an optimization of the above technical solution, before the annealing starts, the temperature in the preheating chamber 18 is raised to 300 - 350 °C, the temperature in the annealing chamber 19 is raised to 600 - 650 °C, and the temperature in the cooling chamber 20 is raised to 200 - 250 °C; open the box cover 11, push the quartz tube rack 2 into the preheating chamber 18, close the box cover 11, and keep it warm for at least 1 hour; raise the lifting partition 17 between the preheating chamber 18 and the annealing chamber 19, push the quartz tube rack 2 into the annealing chamber 19, and then lower the lifting partition 17; keep the temperature in the annealing chamber 19 at 600 - 650 °C for at least 1 hour, and then raise the temperature to 1150 - 1250 °C and keep it warm for 0.5 - 1 hour; raise the lifting partition 17 between the annealing chamber 19 and the cooling chamber 20, and pull the quartz tube rack 2 in the annealing chamber 19 into the cooling chamber 20; after keeping it warm for at least 1 hour under the temperature condition of 200 - 250 °C in the cooling chamber 20, open the box cover 11, and take out the quartz tube rack 2 in the cooling chamber 20 to complete the annealing.

[0032] It is worth mentioning that the technical features such as the heating device, temperature sensing device, motor, and cylinder involved in this invention patent application should be regarded as prior art. For the specific structures, working principles, as well as the possible control methods and spatial arrangement methods of these technical features, conventional selections in this field can be adopted, and they should not be regarded as the inventive points of this invention patent. This invention patent will not be further specifically elaborated.

[0033] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations based on the concept of the present invention without creative efforts. Therefore, all technical solutions that can be obtained by those skilled in the art in this technical field through logical analysis, reasoning, or limited experiments based on the concept of the present invention on the basis of the prior art should fall within the protection scope determined by the claims.

Claims

1. Annealing device for large-diameter quartz tube, characterized in that, It includes an annealing furnace, a quartz tube rack, and a conveyor belt. The annealing furnace includes a furnace chamber, in which a heating device and a temperature sensing device are installed. One end of the annealing furnace is provided with a feed inlet communicating with the furnace chamber, and the other end is provided with a discharge outlet communicating with the furnace chamber. The conveyor belt includes a feed conveyor belt, an in-furnace conveyor belt, and a blanking conveyor belt arranged in sequence. The in-furnace conveyor belt is located at the bottom of the furnace chamber and its two ends are respectively close to the feed inlet and the discharge outlet. One end of the feed conveyor belt is close to the feed inlet, and one end of the blanking conveyor belt is close to the discharge outlet. The quartz tube rack includes a rack body, and a number of placement stations are provided on the rack body. Each placement station is used to place a quartz tube. A number of rotating shafts are provided on the placement station, and a number of support wheels are fixedly connected to the rotating shafts. The rotating shafts are respectively rotatably installed on the rack body. The rotating shafts on each placement station are sequentially arranged around the corresponding quartz tube. The feed inlet and the discharge outlet are respectively covered with a box cover, and the upper end of the box cover is hinged to the annealing furnace. One of the rotating shafts in each of the placement stations is set as a driving shaft. A rotating wheel for driving all the driving shafts on the same rack body to rotate is installed on the rack body. The rotating wheel and the driving shaft are respectively connected by a synchronous belt or a chain. A driving wheel is installed in the furnace chamber. The driving wheel is driven to rotate by a driving motor, and the driving wheel is driven to descend or ascend by a lifting cylinder. The number of rotating shafts in each placement station is 4. Two of the rotating shafts are located at the lower end of the placement station, and the other two rotating shafts are located at the upper end of the placement station. The rotating shafts located at the lower end of the placement station are connected to the rack body by a fixing rod. The upper end of the fixing rod is connected to the corresponding rotating shaft through a bearing, and the lower end of the fixing rod is fixedly connected to the rack body. The rotating shafts located at the upper end of the placement station are connected to the rack body by a movable rod. The upper end of the movable rod is rotatably connected to the rack body, and the lower end of the movable rod is connected to the corresponding rotating shaft through a bearing. The interior of the furnace chamber is sequentially partitioned into a preheating chamber, an annealing chamber, and a cooling chamber by two lifting partition plates. Slide rails are respectively installed on both sides of the lifting partition plates, and sliders are installed on the slide rails. The sliders are fixedly connected to the annealing furnace. A rack is fixedly connected to the lifting partition plate. Two lifting motors are installed at the upper end of the annealing furnace. The driving shafts of the lifting motors are connected with lifting gears, and the lifting gears are respectively meshed with the rack. The number of driving wheels is three. The three driving wheels are respectively driven to rotate by driving motors, and the three driving wheels are respectively installed in the preheating chamber, the annealing chamber, and the cooling chamber. A limiting baffle is provided above the quartz tube rack.

2. The large-diameter quartz tube annealing device according to claim 1, characterized in that The in-furnace conveyor belt is divided into a front section conveyor belt, a middle section conveyor belt, and a rear section conveyor belt. The front section conveyor belt is located in the preheating chamber, the middle section conveyor belt is located in the annealing chamber, and the rear section conveyor belt is located in the cooling chamber.

3. Annealing method for large-diameter quartz tubes, characterized in that, Using the annealing device as claimed in claim 2, it includes the following steps: Step 1, sequentially place the large-diameter quartz tubes on the placement stations in the quartz tube rack; Step 2, push the quartz tube rack into the preheating chamber to preheat the quartz tubes in the quartz tube rack. During the preheating process, the driving wheels in the preheating chamber are driven to rotate by the driving motors, driving all the quartz tubes in the quartz tube rack to rotate; Step 3: After preheating is completed, push the quartz tube rack into the annealing chamber and perform annealing according to the set annealing process. During the annealing process, the driving wheel in the annealing chamber is driven by a driving motor to rotate, driving all the quartz tubes in the quartz tube rack to rotate; Step 4: After annealing is completed, pull the quartz tube rack into the cooling chamber for cooling. During the cooling process, the driving wheel in the cooling chamber is driven by a driving motor to rotate, driving all the quartz tubes in the quartz tube rack to rotate.

4. The annealing method for a large-diameter quartz tube according to claim 3, characterized in that Before annealing starts, heat up the preheating chamber to 300 - 350 °C, the annealing chamber to 600 - 650 °C, and the cooling chamber to 200 - 250 °C; open the box cover, push the quartz tube rack into the preheating chamber, close the box cover, and keep it warm for at least 1 hour; raise the lifting partition between the preheating chamber and the annealing chamber, push the quartz tube rack into the annealing chamber, and then lower the lifting partition; maintain the temperature at 600 - 650 °C in the annealing chamber for at least 1 hour, then raise the temperature to 1150 - 1250 °C and keep it warm for 0.5 - 1 hour; raise the lifting partition between the annealing chamber and the cooling chamber, and pull the quartz tube rack in the annealing chamber into the cooling chamber; after keeping it warm for at least 1 hour at a temperature of 200 - 250 °C in the cooling chamber, open the box cover and take out the quartz tube rack in the cooling chamber to complete annealing.

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