A rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods

Abstract

This application relates to the field of glass rod forming and discloses a rotary die-changing extrusion forming device for multi-specification chalcogenide glass rods, including a working platform, a drive component, a rotating disk, multiple forming components, an extrusion forming component, a heat preservation component, and a cleaning component. By setting a floating nozzle mold and a heat preservation gap between the nozzle mold and the fixed shell, this application enables the forming components to perform extrusion forming, heating and heat preservation, and residual material cleaning at different stations, thereby improving the stability and efficiency of continuous production of multi-specification chalcogenide glass rods.

Description

Technical Field

[0001] This application relates to the field of glass rod forming technology, specifically to a rotary die-changing extrusion forming device for multi-specification chalcogenide glass rods. Background Technology

[0002] Chalcogenide glasses have a wide infrared transmission band, high refractive index, and good pyrogenic properties, making them highly valuable in infrared imaging, optical detection, industrial inspection, and national defense. With the increasing demand for chalcogenide glass rods of different diameters and cross-sectional specifications, near-net-shape forming of chalcogenide glass rods using extrusion molding has become an important technical means to reduce material loss and improve production efficiency.

[0003] When existing chalcogenide glass rod extrusion molding equipment switches between multiple specifications, it is usually necessary to change the corresponding nozzle or mold for different specifications. The common method is to disassemble and replace the whole assembly. This method not only has low mold changing efficiency, but also the nozzle temperature is prone to drop during the replacement process. This results in long preheating time and unstable initial output when the new nozzle re-enters the working state, which in turn affects the molding efficiency and rod size consistency.

[0004] In addition, most existing forming nozzles adopt a rigid installation structure. When the nozzle is connected with the upper discharge end, it mainly relies on high installation accuracy to achieve alignment. When the nozzle undergoes thermal expansion under high temperature or when there is a slight positional deviation during multiple switching processes, it can easily affect the stability of the fit between the nozzle and the discharge end, which can lead to poor sealing at the connection, heat loss, or fluctuations in the forming state.

[0005] Furthermore, after chalcogenide glass is extruded, some high-temperature material may remain inside the nozzle and at the discharge end. If the nozzle is not kept warm or cleaned in time after completing one molding cycle, the residual material may adhere, condense, or clog inside the nozzle, thus affecting the molding quality when used again. Therefore, how to enable the same nozzle to achieve extrusion molding, hot insulation, and residual material cleaning at different stations has become a key issue in improving the stability of continuous production of multi-specification chalcogenide glass rods. Summary of the Invention

[0006] The purpose of this application is to provide a rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods, so as to solve the problems of low nozzle switching efficiency, easy heat loss from nozzles, and difficulty in cleaning residual materials inside nozzles during the production switching process of multi-specification chalcogenide glass rods in the prior art.

[0007] To achieve the above objectives, this application provides the following technical solution:

[0008] This application provides a rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods, including a working platform. A drive assembly is fixedly mounted on the working platform, and a rotating disk is connected to the drive assembly. Multiple molding components are fixedly arranged circumferentially on the rotating disk. An extrusion molding component, a heat preservation component, and a cleaning component are sequentially arranged on the outer periphery of the rotating disk. Each molding component includes a fixed housing fixedly mounted on the rotating disk and a nozzle mold movably mounted within the fixed housing. A heat preservation gap is formed between the nozzle mold and the fixed housing. A connecting end is fixedly mounted on the top of the nozzle mold. The connecting end is used to cooperate with the extrusion molding component, the heat preservation component, and the cleaning component, respectively. The connecting end is movably connected to the fixed housing through an elastic floating structure. The elastic floating structure allows the connecting end and the nozzle mold to move vertically relative to the fixed housing. When the molding component is located at the extrusion molding component, extrusion molding is performed. The forming component presses down on the nozzle mold through the connecting end, causing the nozzle mold to move downward relative to the fixed shell and close the insulation gap for extrusion molding. When the forming component is located at the insulation component, the insulation component presses down on the nozzle mold through the connecting end, causing the nozzle mold to move downward relative to the fixed shell and close the insulation gap for heating and insulation. When the forming component is located at the cleaning component, the cleaning component is set at the bottom of the nozzle mold and is used to receive the residual material discharged from the bottom of the nozzle mold. The nozzle mold floats vertically relative to the fixed shell and cooperates with the cleaning gas entering the internal flow channel of the nozzle mold to clean the residual material. By setting up a floating nozzle mold and connecting ends that cooperate with different work stations, multiple forming components can form a continuous rotating working state of extrusion molding, pre-insulation and subsequent cleaning in different work stations, thereby improving the stability and efficiency of continuous switching production of multi-specification bars.

[0009] Furthermore, the drive assembly includes a fixed block fixedly mounted on the work platform, an electric push rod movably mounted on the fixed block, and a drive motor fixedly mounted on one side of the fixed block. The drive motor is connected to the electric push rod via a gear set to drive the rotating disk connected to the upper end of the electric push rod to rotate in an indexing manner. The electric push rod is used to drive the rotating disk to move up and down. By integrating the indexing rotation and lifting action of the rotating disk into the same drive assembly, it is beneficial to simplify the overall structure of the device and improve the coordination of the actions of multiple molding components when switching between different workstations.

[0010] Furthermore, the bottom of the nozzle mold extends to the outside of the fixed housing. The outer wall of the nozzle mold is provided with a stepped portion, and the inner wall of the fixed housing is provided with a stepped surface adapted to the stepped portion. The heat preservation gap is a stepped gap formed between the stepped portion and the stepped surface. A through hole is opened at the top of the connecting end, and a guide slope is provided at the edge of the through hole. A connecting ring is fixedly provided at the bottom of the connecting end. A floating groove is opened at the top of the fixed housing, and the connecting ring is movably disposed in the floating groove. The elastic floating structure includes a floating spring disposed in the floating groove and connected to the connecting ring. The stepped gap formed between the stepped portion and the stepped surface facilitates the introduction of heat preservation gas and forms a heat preservation cavity surrounding the outer periphery of the nozzle mold. At the same time, the nozzle mold can achieve stable floating within the fixed housing through the cooperation of the connecting ring, the floating groove and the floating spring.

[0011] Furthermore, the extrusion molding assembly includes a heating furnace and an extrusion device. The bottom of the heating furnace is provided with a discharge pipe that connects to the top through hole of the connecting end. A flexible heat insulation cover is provided at the bottom of the heating furnace around the discharge pipe to cover the axial floating gap between the connecting end and the top of the fixed housing. When the discharge pipe connects with the connecting end and the connecting end is pressed down, the connecting end drives the nozzle mold to move down and compress the floating spring to close the heat insulation gap and perform extrusion molding. The cooperation between the guide slope and the discharge pipe can improve the introduction stability when the nozzle mold connects with the discharge pipe. The flexible heat insulation cover, in conjunction with the pressing action of the connecting end, closes the top axial floating gap, thereby maintaining a good heat insulation effect for the gas in the heat insulation gap during the molding stage.

[0012] Furthermore, an arc-shaped protrusion is fixedly provided on the inner wall of the through hole at the top of the connecting end, and a groove adapted to the arc-shaped protrusion is provided on the outer wall of the discharge tube, so that after the discharge tube is inserted into the through hole, the arc-shaped protrusion and the groove are engaged to further fix the connecting end and the discharge tube. By setting the limiting fit structure of the arc-shaped protrusion and the groove, it is beneficial to enhance the connection stability between the discharge tube and the connecting end during the molding process and avoid the connection from loosening or shifting under the extrusion state.

[0013] Furthermore, a gas storage tank is fixedly installed on the working platform. The gas storage tank is connected to each molding component through a gas supply pipeline to deliver gas into the insulation gap between the fixed shell and the nozzle mold. After the connecting end moves down, the gas is sealed in the insulation gap to form an insulation gas layer. By setting up a gas storage tank to deliver gas into the insulation gap, a surrounding insulation layer can be formed around the nozzle mold, thereby slowing down the heat loss of the nozzle mold and improving the temperature holding ability during hot state switching.

[0014] Furthermore, the insulation component includes a fixed frame, a lead screw rotatably disposed within the fixed frame, and a movable nut threaded onto the lead screw. An insulation cover that can move up and down is connected to the movable nut. The insulation cover is used to move to the outside of the molding component to be switched under the drive of the lead screw and to cover and insulate the molding component to be switched. The insulation cover is driven to move up and down by the lead screw and the movable nut, which helps to pre-insulate the next molding component to be switched without affecting the indexing and switching of the rotating disk.

[0015] Furthermore, a sealing cover is movably installed on the inner wall of the insulation cover, the inner diameter of which is adapted to the outer diameter of the fixed shell. An extrusion block for pressing down the connecting end is provided on the top of the insulation cover, and a vertical pipe for conveying high-temperature gas into the central through hole of the connecting end is provided at the center of the top of the insulation cover. The sealing cover is used to block the axial floating gap between the connecting end and the top of the fixed shell when the insulation cover moves down. The extrusion block presses down the connecting end to close the insulation gap. The vertical pipe directly heats the nozzle mold in the forming assembly to be switched and, together with the gas in the insulation gap, achieves insulation. Through the cooperation of the sealing cover, the extrusion block and the vertical pipe, the insulation assembly can complete continuous insulation before the forming assembly is switched to the extrusion forming assembly, thereby improving the stability during subsequent direct extrusion forming.

[0016] Furthermore, the cleaning component includes a collection box located below the forming component. The collection box is used to receive residual material discharged from the bottom of the nozzle mold. The gas storage tank is connected to the internal flow channel of the nozzle mold through a gas supply line to deliver cleaning gas to the internal flow channel of the nozzle mold when the forming component is located at the cleaning component. This allows the residual material to be discharged from the bottom of the nozzle mold with the cleaning gas and fall into the collection box. By directly inputting cleaning gas into the nozzle mold that has been extruded and formed using the gas storage tank, the residual material in the nozzle mold can be purged and impacted, thereby improving cleaning efficiency and reducing the frequency of manual disassembly and cleaning.

[0017] Furthermore, the gas storage tank intermittently supplies pulsed cleaning gas to the internal flow channel of the nozzle mold through the gas supply pipeline. Under the impact of the pulsed cleaning gas and the reset action of the floating spring, the nozzle mold and the connecting end float up and down relative to the fixed shell, so as to use the impact inertia to make the residual material detach and fall into the collection box. Through the cooperation of the pulsed cleaning airflow and the reset action of the floating spring, the nozzle mold forms a reciprocating impact floating state within the fixed shell, thereby enhancing the effect of residual material detaching from the inner wall of the nozzle mold and the discharge end.

[0018] The technical solution provided in this application has the following advantages compared with the prior art:

[0019] 1. This application sets multiple forming components on a rotating disk, and sequentially sets an extrusion forming component, a heat preservation component, and a cleaning component on the outer periphery of the rotating disk. The current working forming component is extruded at the extrusion forming component, the next forming component to be switched is continuously heat-preserved at the heat preservation component, and the forming component that has completed extrusion forming is cleaned of residual material at the cleaning component. This allows the forming component to be switched to be directly extruded after rotating to the extrusion forming component, thereby improving the stability and continuity of continuous switching production of multi-specification chalcogenide glass rods.

[0020] 2. This application sets an insulation gap between the fixed shell and the nozzle mold, and in conjunction with the connecting end, elastic floating structure and external pressing action, enables the insulation gap to achieve gas introduction, gap sealing and insulation layer formation at different work stations, thereby building a stable insulation gas layer on the outer periphery of the nozzle mold, reducing heat loss of the nozzle mold during the switching process and improving the molding stability after hot switching.

[0021] 3. This application, by setting a floating nozzle mold structure, enables the nozzle mold to not only achieve sealing and molding through downward pressing in the molding station, but also to float up and down relative to the fixed shell under the impact of pulsed airflow in the cleaning station, using the impact inertia to desorb and clean residual materials, thereby reducing nozzle clogging and residual material adhesion problems, and improving the molding reliability when the device is reused. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the overall structure of the device in the embodiments of this application;

[0024] Figure 2 This is a schematic diagram of the molding component in an embodiment of this application;

[0025] Figure 3 This is a schematic diagram of the connection structure between the molding component and the heating furnace in an embodiment of this application;

[0026] Figure 4 This is a schematic diagram of the heating furnace in an embodiment of this application;

[0027] Figure 5 This is an exploded view of the fixed housing and nozzle mold in the embodiments of this application;

[0028] Figure 6This is a cross-sectional view of the molding component in an embodiment of this application;

[0029] Figure 7 for Figure 6 Enlarged view of the structure of section A;

[0030] Figure 8 This is a cross-sectional view of the thermal insulation component in an embodiment of this application.

[0031] Explanation of icon numbers:

[0032] 1. Work platform;

[0033] 2. Drive assembly; 21. Fixing block; 22. Electric actuator; 23. Drive motor; 24. Gear set;

[0034] 3. Rotate the disc;

[0035] 4. Molding component; 41. Fixed housing; 411. Floating groove; 412. Stepped surface; 42. Nozzle mold; 421. Stepped section; 43. Connecting end; 431. Through hole; 432. Guide slope; 433. Arc-shaped protrusion; 44. Connecting ring; 45. Floating spring; 47. Insulation gap;

[0036] 5. Gas storage tanks; 51. Gas supply pipelines;

[0037] 6. Extrusion molding assembly; 61. Heating furnace; 62. Extrusion device; 63. Discharge pipe; 631. Slot; 64. Flexible insulation cover;

[0038] 7. Insulation components; 71. Fixing bracket; 72. Lead screw; 73. Moving nut; 74. Insulation cover; 75. Sealing cover; 76. Extrusion block; 77. Vertical pipe;

[0039] 8. Cleaning components; 82. Collection box;

[0040] 9. Elastic floating structure. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0042] The present application will be further described below with reference to embodiments.

[0043] Example 1:

[0044] Reference Figures 1-8 This first embodiment of the present application provides a rotary extrusion molding device for multi-specification chalcogenide glass rods, including a working platform 1, a drive assembly 2 fixedly mounted on the working platform 1, a rotating disk 3 connected to the drive assembly 2, and multiple molding components 4 fixedly mounted circumferentially on the rotating disk 3. The nozzle molds 42 in the multiple molding components 4 have different lower sizing forming section sizes or different lower sizing forming section cross-sectional shapes. In this embodiment, the lower sizing forming section of the nozzle mold 42 can be set to a circular, rectangular or other irregular cross-section according to the specifications of the chalcogenide glass rods to be processed. After the different molding components 4 rotate with the rotating disk 3, they can be switched sequentially to the extrusion molding components 6, so that the same device can complete the extrusion molding of multi-specification chalcogenide glass rods.

[0045] The outer periphery of the rotating disk 3 is sequentially provided with an extrusion molding component 6, a heat preservation component 7, and a cleaning component 8. The molding component 4 includes a fixed housing 41 fixedly mounted on the rotating disk 3 and a nozzle mold 42 movably mounted inside the fixed housing 41. The bottom of the nozzle mold 42 extends downward to the outside of the fixed housing 41, and a heat preservation gap 47 is formed between the nozzle mold 42 and the fixed housing 41. A connecting end 43 is fixedly mounted on the top of the nozzle mold 42, and the connecting end 43 is movably connected to the fixed housing 41 through an elastic floating structure 9.

[0046] An axial floating gap is formed between the connecting end 43 and the top of the fixed housing 41. The axial floating gap provides clearance for the vertical movement of the connecting end 43 and the nozzle mold 42 relative to the fixed housing 41. When the connecting end 43 is not subjected to external downward pressure, the elastic floating structure 9 keeps the nozzle mold 42 in the floating position. At this time, the insulation gap 47 is in a connected state that allows insulation gas to enter. When the connecting end 43 is pressed down by the extrusion molding component 6 or the insulation component 7, the connecting end 43 drives the nozzle mold 42 to move downward relative to the fixed housing 41, causing the fit position between the outer periphery of the nozzle mold 42 and the inner wall of the fixed housing 41 to change, thereby switching the insulation gap 47 from a connected state to a closed insulation state.

[0047] The drive assembly 2 can be configured with a fixed block 21, an electric push rod 22, a drive motor 23, and a gear set 24 to enable the drive assembly 2 to drive the rotating disk 3 to lift and rotate in an indexing manner. The fixed block 21 is fixedly mounted on the work platform 1, the electric push rod 22 is movably mounted on the fixed block 21, and the drive motor 23 is fixedly mounted on one side of the fixed block 21. The output end of the drive motor 23 is connected to the electric push rod 22 through the gear set 24. The top of the electric push rod 22 is connected to the rotating disk 3, thereby realizing the vertical lifting and circumferential indexing of the rotating disk 3. This part is a conventional configuration in this field, and the specific structure of the drive assembly 2 will not be described in detail here.

[0048] The nozzle mold 42 preferably has a stepped portion 421 on its outer wall, and the fixed housing 41 preferably has a stepped surface 412 that matches the stepped portion 421 on its inner wall. The heat insulation gap 47 is preferably formed between the stepped portion 421 and the stepped surface 412. The top of the connecting end 43 preferably has a through hole 431, and the edge of the through hole 431 preferably has a guide slope 432 to facilitate guiding and docking with the extrusion molding component 6.

[0049] The stepped section 421 is preferably a three-stage stepped section 421, and the stepped surface 412 is preferably a three-stage stepped surface 412 adapted to the three-stage stepped section 421. The nozzle mold 42 preferably has an upper large-diameter inlet section, a middle tapering transition section and a lower sizing forming section, so that the softened chalcogenide glass raw material can stably flow down along the tapering channel after entering the nozzle mold 42 and be extruded into a bar of the target specification by the lower sizing forming section.

[0050] The side wall of the fixed housing 41 is provided with an air inlet that is connected to the air supply line 51. The air inlet is connected to the insulation gap 47. When the connecting end 43 is not pressed down, an air supply channel is maintained between the outer periphery of the nozzle mold 42 and the inner wall of the fixed housing 41. The insulation gas enters the insulation gap 47 through the air inlet. After the connecting end 43 is pressed down, the nozzle mold 42 drives the stepped part 421 to move down along the stepped surface 412. The stepped part 421 and the stepped surface 412 form a close sealing position below the air inlet, so that the gas in the insulation gap 47 is restricted to the outer periphery of the nozzle mold 42, thereby reducing the leakage of insulation gas and improving the insulation continuity of the nozzle mold 42.

[0051] The cross-sectional shape of the lower sizing section inside the nozzle mold 42 can be set according to the specifications of the rod to be processed. Preferably, a circular, rectangular or other irregular cross-sectional structure can be adopted so that the nozzle mold 42 can be adapted to the extrusion molding needs of chalcogenide glass rods with different cross-sectional shapes.

[0052] It should be noted that the elastic floating structure 9 can be configured with a floating groove 411 set on the top of the fixed housing 41, a connecting ring 44 set below the connecting end 43, and a floating spring 45 set in the floating groove 411 and connected to the connecting ring 44, so that the connecting end 43, the connecting ring 44 and the nozzle mold 42 form an integral core structure that can float up and down relative to the fixed housing 41.

[0053] In this embodiment, a gas storage tank 5 can also be set on one side of the working platform 1. The gas storage tank 5 is connected to each molding component 4 through the gas supply pipeline 51 to deliver heat-insulating gas into the heat-insulating gap 47. Preferably, the gas storage tank 5 and the rotating disk 3 can be connected by a rotation gas supply method to ensure that the rotating disk 3 can continue to supply gas to each molding component 4 during the indexing rotation process. This structure allows the same molding component 4 to switch different working states in different work positions and provides a unified core nozzle structure foundation for subsequent molding, heat preservation and cleaning.

[0054] The insulating gas entering the insulating gap 47 is preferably a high-purity inert gas. The high-purity inert gas can be nitrogen or argon with a purity of not less than 99.999%. When supplying the gas, it can first be output from the gas storage tank 5 and transported to each molding component 4 through the gas supply pipeline 51, and then enter the insulating gap 47 along the side wall of the fixed shell 41 to form a gas insulation layer on the outer periphery of the nozzle mold 42 and reduce heat loss.

[0055] The extrusion molding component 6 is used to solve the problem of easy heat loss and poor docking stability of the nozzle mold 42 during the production switching process of multi-specification chalcogenide glass rods. Specifically, the extrusion molding component 6 includes a heating furnace 61 and an extrusion device 62. The heating furnace 61 is fixedly set on the working platform 1 and located directly above one of the molding components 4. The extrusion device 62 is set on the upper part of the heating furnace 61 to push the softened chalcogenide glass raw material in the furnace downward. A discharge pipe 63 is fixedly set at the center of the bottom of the heating furnace 61. A flexible heat insulation cover 64 is fixedly set on the bottom of the heating furnace 61 around the discharge pipe 63. The extruded chalcogenide glass rod can enter the subsequent annealing equipment for conventional annealing treatment. The subsequent annealing equipment is not an essential component of the molding component 4, extrusion molding component 6, heat insulation component 7 and cleaning component 8 of this application.

[0056] The heating furnace 61 preferably adopts a temperature-controlled sealed cavity structure, which is equipped with a heating module, a temperature control sensor and a temperature control unit. The temperature control unit preferably adopts a closed-loop control method to ensure that the temperature control accuracy of the heating furnace 61 reaches ±1℃ and the temperature difference in the same heating area is not greater than 10℃. The extrusion device 62 preferably adopts a servo hydraulic drive structure, and its output extrusion pressure can be continuously adjusted within the range of 0 to 50MPa, thereby meeting the requirements for temperature rise stability and extrusion pressure adjustability when extruding chalcogenide glass rods of different specifications.

[0057] In the initial state, the floating spring 45 is in an extended state, and an axial floating gap is preferably maintained between the connecting end 43 and the top of the fixed housing 41. At this time, the gas storage tank 5 supplies inert insulating gas into the insulation gap 47 through the gas supply pipeline 51. After the electric push rod 22 drives the rotating disk 3 and the corresponding forming component 4 to move upward as a whole, the flexible insulation cover 64 first covers the connecting end 43 and the top area of ​​the fixed housing 41 from the outside to seal the outer periphery of the axial floating gap. Then, the discharge pipe 63 is inserted into the through hole 431 under the action of the guide slope 432, and the connecting end 43 is pressed down under the combined action of the continued upward movement and the downward pressing of the glass raw material by the extrusion device 62.

[0058] The chalcogenide glass raw material preferably uses a large-diameter bar blank with a diameter of 90mm to 130mm. Before entering the heating furnace 61, the two ends of the blank are preferably cut and polished, and then wiped clean with anhydrous ethanol. The inner wall of the nozzle mold 42 and the flow surface in contact with the raw material are preferably pre-coated with boron nitride powder solution and air-dried to form an isolation layer. The mass ratio of boron nitride to water is preferably 1:100 to 1:120 to reduce the risk of adhesion when the raw material comes into contact with the nozzle mold 42 at high temperature.

[0059] After the connecting end 43 is pressed down, it drives the nozzle mold 42 to move downward and compress the elastic floating structure 9. After the nozzle mold 42 moves down, the stepped part 421 on the outer wall of the nozzle mold 42 and the stepped surface 412 on the inner wall of the fixed shell 41 form a close or disconnected connection at the upper position, thereby changing the heat insulation gap 47 from a connected state to a closed state. At this time, the inert heat insulation gas that has entered the heat insulation gap 47 in advance is sealed between the fixed shell 41 and the nozzle mold 42 to form a heat insulation gas layer around the outer periphery of the nozzle mold 42. Then, the softened chalcogenide glass raw material in the heating furnace 61 enters the nozzle mold 42 through the discharge pipe 63 and is extruded from the bottom of the nozzle mold 42.

[0060] The heating furnace 61 can first preheat the chalcogenide glass raw material at a heating rate of 10°C to 20°C per hour and hold it at a temperature close to the glass transition temperature for 1 to 2 hours. Then, it can continue to heat the raw material to 50°C to 80°C above the softening temperature and hold it for 2 to 4 hours. After the raw material temperature is uniform, the extrusion device 62 preferably applies an extrusion pressure of 10 MPa to 30 MPa and its extrusion speed is preferably controlled at 0.5 mm per minute to 2 mm per minute, so that the chalcogenide glass raw material can maintain a stable rheological state in the nozzle mold 42 and be continuously extruded.

[0061] In this embodiment, the inner wall of the through hole 431 at the top of the connecting end 43 can preferably be provided with an arc-shaped protrusion 433, and the outer wall of the discharge tube 63 can preferably be provided with a groove 631 that matches the arc-shaped protrusion 433, so as to form further limiting and fixing after the discharge tube 63 is inserted into the through hole 431, thereby improving the connection stability between the connecting end 43 and the discharge tube 63 during the extrusion molding process and reducing the risk of separation caused by force fluctuations during the molding process.

[0062] In this embodiment, the annealing furnace located below the nozzle mold 42 is a glass rod annealing device in the prior art. The annealing furnace preferably adopts a zoned temperature control structure. After extrusion, the chalcogenide glass rod is output from the bottom of the nozzle mold 42 and directly enters the annealing furnace. The temperature of the annealing furnace inlet zone is preferably 10°C to 20°C higher than the glass transition temperature, and the temperature of the annealing furnace outlet zone is preferably 30°C to 60°C lower than the glass transition temperature. The residence time of the rod in the annealing furnace is preferably 30 minutes to 60 minutes to reduce the surface cooling rate and eliminate the instantaneous thermal stress generated during the forming process. A precision annealing device can also be set up behind the annealing furnace to perform secondary annealing on the rod to further eliminate internal residual stress and improve the mechanical properties and optical uniformity of the rod.

[0063] Example 2:

[0064] Reference Figures 6-8 This is the second embodiment of the present application, which provides a heat preservation and cleaning structure in conjunction with Embodiment 1. It is used to solve the problems of insufficient temperature of the next molding component 4 to be switched during the production switching process of multi-specification chalcogenide glass rods, which affects the subsequent extrusion stability, and the problem that residual material inside the molding component 4 that has been extruded is not easy to detach. The heat preservation component 7 includes a fixed frame 71 fixedly set on the working platform 1. A lead screw 72 is vertically rotatably set in the fixed frame 71. A movable nut 73 is threadedly connected to the lead screw 72. A heat preservation cover 74 is laterally connected to the movable nut 73. The heat preservation cover 74 can move up and down relative to the fixed frame 71 under the action of the rotation of the lead screw 72.

[0065] In this embodiment, a sealing cover 75 is movably provided on the inner wall of the heat insulation cover 74. The inner diameter of the sealing cover 75 is adapted to the outer diameter of the fixed housing 41, and the lower port forms an annular sealing edge. A pressing block 76 for pressing down the connecting end 43 is provided on the top of the heat insulation cover 74. A vertical pipe 77 for conveying high-temperature gas into the central through hole 431 of the connecting end 43 is provided at the center of the top of the heat insulation cover 74. The upper end of the vertical pipe 77 is connected to the high-temperature inert gas supply source, and the lower end passes through the pressing block 76 and extends into the top through hole 431 of the connecting end 43.

[0066] The sealing cover 75 is slidably connected to the insulation cover 74 via a vertical guide rod. A sealing spring is sleeved on the outer periphery of the vertical guide rod. The sealing spring is used to ensure that the sealing cover 75 contacts the outer periphery of the fixed housing 41 before the extrusion block 76 when the insulation cover 74 moves down, and to maintain the sealing of the outer side of the axial floating gap during the process of the extrusion block 76 pressing down on the connecting end 43, thereby reducing the leakage of insulation gas from the connecting end 43 to the top of the fixed housing 41.

[0067] The high-temperature inert gas supply source connected to the vertical pipe 77 is preferably composed of an inert gas branch branch from the gas storage tank 5 and a gas heating device installed on the branch. The inert gas output from the gas storage tank 5 first enters the gas heating device through the branch and is heated to a temperature that matches the insulation requirements of the nozzle mold 42 before entering the vertical pipe 77. After entering the top through hole 431 of the connecting end 43, the high-temperature inert gas flows downward along the internal flow channel of the nozzle mold 42, thereby directly heating the inner side of the nozzle mold 42. Meanwhile, the inert gas entering the insulation gap 47 surrounds and insulates the outer periphery of the nozzle mold 42, forming a synergistic insulation method.

[0068] When one of the molding components 4 is located at the extrusion molding component 6 and is undergoing extrusion molding, the next molding component 4 to be switched rotates to the insulation component 7 and remains in a hot standby state. The lead screw 72 rotates, driving the moving nut 73 to move downward, thereby causing the insulation cover 74 to move down to the outside of the molding component 4 to be switched. The sealing cover 75 inside the insulation cover 74 first covers the fixed housing 41 from the outside and seals the axial floating gap between the connecting end 43 and the fixed housing 41. At this time, the gas storage tank 5 continues to supply insulation gas into the insulation gap 47. Subsequently, the electric push rod 22 drives the rotating disk 3 and the molding component 4 to be switched to continue to move upward, so that the connecting end 43 contacts the extrusion block 76 and is pressed downward. The end 43 contacts the extrusion block 76 and is pressed downward, causing the nozzle mold 42 to move downward relative to the fixed housing 41 again and the insulation gap 47 to enter a closed state. At the same time, the vertical pipe 77 continuously supplies high-temperature gas into the through hole 431. The high-temperature gas flows along the internal flow channel of the nozzle mold 42 and directly heats the nozzle mold 42, thereby forming a composite insulation state in which the central high-temperature gas heating and the outer peripheral insulation gas layer insulation occur simultaneously. This allows the molding component 4 to be switched to the extrusion molding component 6 to be directly extruded and molded, reducing the risk of initial molding instability. The molding component 4 that was originally extruded and molded is rotated to the cleaning component 8 after the rotating disk 3 continues to rotate in increments for residual material cleaning.

[0069] The temperature of the high-temperature inert gas transported in the vertical pipe 77 is preferably higher than the standby temperature of the nozzle mold 42 and lower than the softening temperature of the chalcogenide glass raw material, so that the nozzle mold 42 is kept in a hot standby state at the heat insulation component 7 and the residual material does not flow excessively inside the nozzle mold 42. At the same time, the heat insulation cover 74 and the sealing cover 75 form a relatively closed covering space on the outer periphery of the fixed shell 41, which is beneficial to reduce heat loss during the heat insulation stage.

[0070] The cleaning component 8 includes a collection box 82 located below the nozzle mold 42. The collection box 82 is used to receive residual material discharged from the bottom of the nozzle mold 42. When the molding component 4 rotates to the cleaning component 8, the gas tank 5 supplies cleaning gas to the internal flow channel of the nozzle mold 42 through the gas supply line 51. The cleaning gas flows downward along the internal flow channel of the nozzle mold 42 and carries the residual material attached to the inner wall and the lower outlet of the nozzle mold 42 downward to be discharged. The residual material falls into the collection box 82 after being detached from the bottom of the nozzle mold 42. Preferably, the gas tank 5 can intermittently output pulsed cleaning airflow. Under the impact of the pulsed cleaning airflow and the reset action of the floating spring 45, the nozzle mold 42 and the connecting end 43 form a reciprocating floating state relative to the fixed housing 41. The residual material attached to the inside of the nozzle mold 42 and the lower outlet is detached by the airflow and the reciprocating impact inertia and falls into the collection box 82. This structure allows the molding component 4 to complete the hot standby heat preservation and automatic cleaning of residual material in sequence without disassembly.

[0071] As can be seen from Embodiments 1 and 2, this application arranges multiple forming components 4 circumferentially on the rotating disk 3, and makes the multiple forming components 4 correspond to the extrusion forming component 6, the heat preservation component 7 and the cleaning component 8 respectively during the indexing rotation of the rotating disk 3. The current working forming component 4 is extruded at the extrusion forming component 6, the next forming component 4 to be switched is continuously heat preserved at the heat preservation component 7, and the forming component 4 that has completed extrusion forming is cleaned of residual material at the cleaning component 8. Thus, each forming component 4 forms a continuous rotation working state of extrusion forming, pre-heat preservation and subsequent cleaning during the switching process.

[0072] The advantages of this application are:

[0073] The rotating disk 3 sequentially switches multiple forming components 4 to the extrusion forming component 6, the heat preservation component 7, and the cleaning component 8, enabling different specifications of nozzle dies 42 to be indexed and switched within the same equipment. Through the cooperation of the connecting end 43, the heat preservation gap 47, and the elastic floating structure 9, the nozzle die 42 can close the heat preservation gap 47 and stabilize the forming in the extrusion forming state, reduce heat loss in the standby heat preservation state, and remove internal residual materials with the help of cleaning gas and vertical floating in the cleaning state. By dividing the work of the heat preservation gas supply branch and the cleaning gas supply branch, the heat preservation gas and the cleaning gas work for different workstations, thereby reducing the mold change waiting time and the impact of residual materials on the forming quality of the next specification of bar stock.

[0074] The working principle of this application is as follows:

[0075] The drive component 2 drives the rotating disk 3 to rotate and lift in stages, so that multiple forming components 4 can work in turn between different workstations. The forming component 4 at the extrusion forming component 6 completes the guiding docking, the sealing of the heat preservation gap 47 and the extrusion forming. The forming component 4 at the heat preservation component 7 completes the outer sealing, center heating and outer circumferential heat preservation before switching, so that it can directly perform extrusion forming after rotating to the extrusion forming component 6. The forming component 4 at the cleaning component 8 completes the airflow flushing and impact cleaning, thereby realizing the continuous switching and stable production between multiple forming components 4.

[0076] In summary, this application enables the rotation of multiple specifications of chalcogenide glass rod forming components 4, pre-heating before switching, and subsequent automatic cleaning in one set of equipment, so that the next forming component 4 to be switched has a higher temperature before entering the extrusion forming component 6, thereby improving the stability and efficiency of continuous switching production of multiple specifications of chalcogenide glass rods.

[0077] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of this application.

Claims

1. A rotary extrusion molding device for multi-specification chalcogenide glass rods, comprising a working platform (1), a driving assembly (2) fixedly mounted on the working platform (1), and a rotating disk (3) connected to the driving assembly (2), characterized in that: Multiple forming components (4) are fixedly arranged circumferentially on the rotating disk (3). An extrusion forming component (6), a heat preservation component (7), and a cleaning component (8) are arranged sequentially on the outer periphery of the rotating disk (3). Each forming component (4) includes a fixed housing (41) fixedly arranged on the rotating disk (3) and a nozzle mold (42) movably arranged inside the fixed housing (41). The nozzle mold (42) and the fixed housing (41) form a heat preservation gap (47). A connecting end (43) is fixedly arranged on the top of the nozzle mold (42). The connecting end (43) is used to cooperate with the extrusion forming component (6), the heat preservation component (7), and the cleaning component (8) respectively. The connecting end (43) and the fixed housing (41) are movably connected by an elastic floating structure (9). The elastic floating structure (9) is used to make the connecting end (43) and the nozzle mold (42) move vertically relative to the fixed housing (41). When the forming component (4) is located at the extrusion forming component (6), the extrusion forming component (6) presses down the nozzle mold (42) through the connecting end (43) so that the nozzle mold (42) moves down relative to the fixed shell (41) and closes the heat insulation gap (47) for extrusion forming. When the forming component (4) is located at the heat insulation component (7), the heat insulation component (7) presses down the nozzle mold (42) through the connecting end (43) so that the nozzle mold (42) moves down relative to the fixed shell (41) and closes the heat insulation gap (47) for heating and heat insulation. When the forming component (4) is located at the cleaning component (8), the cleaning component (8) is set at the bottom of the nozzle mold (42) and is used to receive the residual material discharged from the bottom of the nozzle mold (42). The nozzle mold (42) floats vertically relative to the fixed shell (41) and cooperates with the cleaning gas entering the internal flow channel of the nozzle mold (42) to clean the residual material.

2. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 1, characterized in that: The drive assembly (2) includes a fixed block (21) fixedly mounted on the work platform (1), an electric push rod (22) movably mounted on the fixed block (21), and a drive motor (23) fixedly mounted on one side of the fixed block (21). The drive motor (23) is connected to the electric push rod (22) via a gear set (24) to drive the rotating disk (3) connected to the upper end of the electric push rod (22) to rotate in increments. The electric push rod (22) is used to drive the rotating disk (3) to move up and down.

3. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 2, characterized in that: The nozzle mold (42) extends to the outside of the fixed housing (41) at the bottom. The outer wall of the nozzle mold (42) is provided with a stepped portion (421). The inner wall of the fixed housing (41) is provided with a stepped surface (412) that is adapted to the stepped portion (421). The heat insulation gap (47) is a stepped gap formed between the stepped portion (421) and the stepped surface (412). The top of the connecting end (43) is provided with a through hole (431). The edge of the through hole (431) is provided with a guide slope (432). The bottom of the connecting end (43) is fixedly provided with a connecting ring (44). The top of the fixed housing (41) is provided with a floating groove (411). The connecting ring (44) is movably disposed in the floating groove (411). The elastic floating structure (9) includes a floating spring (45) disposed in the floating groove (411) and connected to the connecting ring (44).

4. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 3, characterized in that: The extrusion molding assembly (6) includes a heating furnace (61) and an extrusion device (62). The bottom of the heating furnace (61) is provided with a discharge pipe (63) that is connected to the top through hole (431) of the connecting end (43). The bottom of the heating furnace (61) is provided with a flexible heat insulation cover (64) on the outer periphery of the discharge pipe (63) to cover the axial floating gap between the connecting end (43) and the top of the fixed housing (41). When the discharge pipe (63) is connected to the connecting end (43) and the connecting end (43) is pressed down, the connecting end (43) drives the nozzle mold (42) to move down and compress the floating spring (45) to close the heat insulation gap (47) and perform extrusion molding.

5. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 4, characterized in that: The inner wall of the through hole (431) at the top of the connecting end (43) is fixedly provided with an arc-shaped protrusion (433), and the outer wall of the discharge pipe (63) is provided with a slot (631) that matches the arc-shaped protrusion (433), so that after the discharge pipe (63) is inserted into the through hole (431), the arc-shaped protrusion (433) and the slot (631) are engaged to further fix the connecting end (43) and the discharge pipe (63).

6. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 3, characterized in that: A gas storage tank (5) is fixedly installed on the working platform (1). The gas storage tank (5) is connected to each molding component (4) through a gas supply pipeline (51) to supply gas into the heat insulation gap (47) between the fixed shell (41) and the nozzle mold (42). After the connecting end (43) moves down, the gas is sealed in the heat insulation gap (47) to form a heat insulation gas layer.

7. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 1, characterized in that: The heat insulation component (7) includes a fixed frame (71), a lead screw (72) rotatably disposed in the fixed frame (71), and a movable nut (73) threaded onto the lead screw (72). A heat insulation cover (74) that can move up and down is connected to the movable nut (73). The heat insulation cover (74) is used to move to the outside of the molding component (4) to be switched under the drive of the lead screw (72) and cover the molding component (4) to be switched for heat insulation.

8. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 3, characterized in that: The inner wall of the heat insulation cover (74) is movably provided with a sealing cover (75). The inner diameter of the sealing cover (75) is adapted to the outer diameter of the fixed shell (41). The top of the heat insulation cover (74) is provided with a pressing block (76) for pressing down the connecting end (43). The center of the top of the heat insulation cover (74) is provided with a vertical pipe (77) for conveying high-temperature gas into the central through hole (431) of the connecting end (43). The sealing cover (75) is used to block the axial floating gap between the connecting end (43) and the top of the fixed shell (41) when the heat insulation cover (74) moves down. The pressing block (76) is used to press down the connecting end (43) to close the heat insulation gap (47). The vertical pipe (77) directly heats the nozzle mold (42) in the forming assembly to be switched (4) and cooperates with the gas in the heat insulation gap (47) to achieve heat preservation.

9. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 6, characterized in that: The cleaning component (8) includes a collection box (82) disposed below the molding component (4). The collection box (82) is used to receive residual material discharged from the bottom of the nozzle mold (42). The gas storage tank (5) is connected to the internal flow channel of the nozzle mold (42) through a gas supply line (51) to deliver cleaning gas to the internal flow channel of the nozzle mold (42) when the molding component (4) is located at the cleaning component (8), so that the residual material is discharged from the bottom of the nozzle mold (42) along with the cleaning gas and falls into the collection box (82).

10. The rotary die-changing extrusion molding device for multi-specification chalcogenide glass rods according to claim 9, characterized in that: The gas storage tank (5) intermittently supplies pulsed cleaning gas to the internal flow channel of the nozzle mold (42) through the gas supply pipeline (51). The nozzle mold (42) and the connecting end (43) float up and down relative to the fixed shell (41) under the impact of the pulsed cleaning gas and the reset action of the floating spring (45), so as to use the impact inertia to make the residual material detach and fall into the collection box (82).

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