A argon protection cover for smelting and pouring of die steel

Abstract

The application relates to an argon protection cover for mold steel smelting and pouring, which comprises a fixed base and an argon ring channel, a lower limiting sleeve is fixedly arranged at the bottom of the fixed base, the fixed base is sleeved with a middle pouring pipe outside through the lower limiting sleeve, an argon ring channel is arranged above the fixed base, a gas filling mechanism is arranged in the argon ring channel, the gas filling mechanism is connected with an external gas supply assembly through a gas inlet pipeline, the gas filling mechanism fills argon in the argon ring channel, a corrugated cover is arranged between the argon ring channel and a top supporting part, and the corrugated cover is completely sleeved with an inner isolation cylinder and an outer isolation cylinder outside; the device is rationally designed in structure, the middle pouring pipe and a ladle nozzle are respectively sleeved with a lower limiting sleeve and an upper limiting sleeve during installation, and are fixed through cooperation of a clamping mechanism, and the operation is simple; a transparent observation window of the argon ring channel is convenient for observing the internal condition and discovering faults in time; the connection between the components is reliable, the disassembly and maintenance are convenient, and the equipment maintenance cost is reduced.

Description

Technical Field

[0001] This invention belongs to the technical field of steel mold smelting equipment, specifically relating to an argon gas protective cover for casting mold steel. Background Technology

[0002] Ingot casting is a common method for pouring molten steel in the iron and steel metallurgical industry. In mold casting, the bottom pouring method is mostly used: molten steel is poured from the bottom of the ladle into the top gate of the middle pouring pipe, then flows from the bottom of the middle pouring pipe into the bottom of the mold, and finally enters the mold cavity from the bottom of the mold until it reaches the riser. During the ingot casting process, there is a space between the bottom of the ladle and the top gate of the middle pouring pipe that is exposed to air. Moisture, oxygen, and other substances in the atmosphere come into contact with the molten steel at this point, easily causing oxidation and air entrapment. This oxidation and air entrapment are then carried into the mold cavity, forming harmful inclusions in the molten steel, affecting the internal and surface quality of the steel mold.

[0003] Chinese invention patent CN112247135A discloses a mold casting protection device with high compensation and visibility functions, including an argon gas protection ring, a visible protective cover and a retractable protective cover. It achieves a complete seal between the ladle outlet and the pouring pipe top inlet during the mold casting process, solving the problem of easy air mixing, which leads to secondary oxidation of molten steel and affects product quality.

[0004] The above-mentioned device has the following problems in use: the argon gas protective ring is directly installed at the ladle's outlet, and the die casting protection device is suspended outside the argon gas protective ring via a suspension component. During the casting process, the continuous outflow of liquid metal from the ladle causes dynamic changes in the ladle's center of gravity. Simultaneously, vibrations are unavoidable during mechanical operation. These factors can cause vibrations or slight shifts in the ladle's outlet, leading to collisions or shifts between the ladle's outlet components and the injection pipe interface, obstructing casting and affecting casting efficiency. This can also lead to safety hazards such as liquid metal leakage. Furthermore, the device connects to external argon gas through the inlet, allowing argon to enter the argon gas protective ring. There is no mention of protective measures for the inlet. During casting, the liquid metal inside the ladle splashes, and these splashed droplets easily adhere to and clog the vents inside the argon gas protective ring, preventing normal argon ejection and rendering the argon gas protective function ineffective. This, in turn, affects the smelting quality of the die steel and increases the product defect rate. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and solve the problems mentioned in the above-mentioned technical background.

[0006] To achieve the above objectives, the present invention provides the following technical solution: an argon gas protective cover for casting in mold steel smelting, comprising a fixed base and an argon gas ring channel. A lower limit sleeve is fixedly installed at the bottom of the fixed base, and the fixed base is sleeved on the outside of the middle injection tube through the lower limit sleeve. An argon gas ring channel is provided above the fixed base, and an inflation mechanism is provided inside the argon gas ring channel. The inflation mechanism is connected to an external gas supply component through an air inlet pipe, and the inflation mechanism fills the argon gas ring channel with argon gas. An outer isolation cylinder is fixedly installed in the middle of the argon gas ring channel, and a top support is provided above the argon gas ring channel. The top support includes an upper support plate, an upper limit sleeve fixedly installed on the upper part of the upper support plate, and the top support is sleeved on the outside of the ladle nozzle through the upper limit sleeve. An inner isolation cylinder is provided in the middle of the upper support plate, and the lower end of the inner isolation cylinder is inserted into the upper end of the outer isolation cylinder. There is a gap between the inner isolation cylinder and the outer isolation cylinder. A corrugated cover is provided between the argon gas ring channel and the top support, and the corrugated cover is completely sleeved on the outside of the inner isolation cylinder and the outer isolation cylinder. A compensation component is provided between the argon gas ring channel and the side of the top support, and the compensation component is used to buffer the height change between the argon gas ring channel and the top support.

[0007] Furthermore, transparent observation windows can be installed around the argon gas loop to facilitate observation of the internal conditions of the argon gas loop, promptly identify problems such as nozzle blockage and abnormal argon gas flow, and ensure timely handling to guarantee the normal operation of the equipment.

[0008] Both the lower and upper limit sleeves are trumpet-shaped, with the end of the lower limit sleeve furthest from the fixed base and the end of the upper limit sleeve furthest from the top support being enlarged ends. This trumpet-shaped limit sleeve design guides the ladle nozzle and the intermediate injection pipe, facilitating connection and fixation, while also improving the stability of the connection and preventing the device from detaching.

[0009] The upper support plate has multiple vent holes with filters inside, and a vent shield is installed above the vent holes. The vent holes are used to discharge excess air and argon gas in the argon gas loop, preventing excessive internal pressure from affecting equipment operation; the filters and vent shield further prevent debris from accumulating in the vent holes, providing double protection to ensure unobstructed venting.

[0010] The compensation assembly includes a vertical rod, the lower end of which is fixedly connected to the upper surface of the argon gas ring, and the upper end of which passes through the upper support plate. A threaded section is provided at the upper end of the vertical rod, and a lock nut is screwed onto the outer side of the threaded section. The compensation assembly can adapt to slight height changes and vibrations of the ladle nozzle. Through the sliding fit between the vertical rod and the upper support plate, it achieves height compensation between the top support and the argon gas ring, buffering vibration impacts. Simultaneously, the height of the top support can be adjusted via the lock nut to accommodate different specifications of ladle nozzles and injection pipes.

[0011] The gas filling mechanism includes a ring pipe and jet nozzles. The ring pipe is fixedly installed inside the argon gas loop, and its shape matches the shape of the argon gas loop. The gas inlet pipe is connected to the ring pipe, and the ring pipe and jet nozzles are connected by a telescopic tube. The ring pipe enables uniform distribution of argon gas, ensuring consistent argon gas output from each jet nozzle and guaranteeing uniform argon gas protection. The telescopic tube allows for adjustment of the jet nozzle angle, preventing damage to the pipes during angle adjustments and facilitating equipment installation and maintenance.

[0012] A deflection mechanism is fixedly installed inside the argon gas ring channel. The deflection mechanism is used to adjust the angle of the jet nozzle. The deflection mechanism includes an outer ring sleeve and an inner gear ring. The outer ring sleeve is fixedly connected to the argon gas ring channel through a connecting rod. Multiple positioning seats are evenly fixed on the outer side of the outer ring sleeve. A rotating sleeve is rotatably sleeved on the outer side of each positioning seat. A jet nozzle is fixed on the outer side of each rotating sleeve. The inner side of each rotating sleeve is provided with oblique teeth. The outer side of the outer ring sleeve is provided with a side seam. The bottom of the outer ring sleeve is provided with a bottom seam. The inner gear ring is rotatably installed inside the outer ring sleeve. An outer gear rack is provided through the inner gear ring at the position corresponding to the side seam. A pin is provided through the inner gear ring at the position corresponding to the bottom seam. The pin cooperates with the oblique teeth on the inner side of the rotating sleeve.

[0013] A deflection motor is fixedly installed on the outer side of the outer ring sleeve. A drive gear is installed at the output end of the deflection motor. The drive gear meshes with the outer rack and drives the inner gear ring to rotate through the outer rack.

[0014] The fixed base is equipped with a clamping mechanism at its bottom, which is used to clamp and position the injection tube. The clamping mechanism includes a frustum and a turntable. The upper part of the frustum is fixedly connected to the fixed base, and the lower part of the turntable is fixedly connected to the lower limit sleeve. The frustum has a channel for the injection tube to pass through. Multiple grooves are evenly arranged at the bottom of the frustum. Multiple connecting rods are evenly arranged inside the turntable, and each connecting rod has an inner hole. Multiple clamping plates are engaged between the frustum and the turntable. The upper part of the clamping plate is engaged with the groove by an upper pin, and the lower part of the clamping plate is engaged with the inner hole by a lower pin. The rotation of the turntable can drive the clamping plates to rotate around the frustum. The sides of the clamping plates are provided with arc-shaped surfaces, and the arc-shaped surfaces of multiple clamping plates are combined to form a complete circle.

[0015] The inner edge of the channel through which the central injection pipe passes is provided with a retaining edge, which is placed on the upper end of the central injection pipe. The retaining edge can limit the fixed base, prevent the fixed base from sliding downward, further improve the installation stability of the device, and ensure the stability of the device position during the pouring process.

[0016] A drive assembly is provided on the outer side of the frustum, which drives the turntable to rotate. The drive assembly can be a gear drive or a worm gear drive, etc.

[0017] This invention provides an argon gas protective cover for casting mold steel, which has the following beneficial effects: Through the trumpet-shaped guide design of the upper and lower limit sleeves, the plug-in cooperation of the outer and inner isolation cylinders, and the buffering effect of the compensation components, the slight vibration and displacement of the ladle nozzle can be compensated and guided, avoiding collision and displacement between the ladle nozzle components and the middle injection pipe interface, ensuring smooth pouring, improving pouring safety, and reducing safety hazards.

[0018] The inner and outer isolation cylinders, together with the corrugated hood, form a closed argon gas protection space, preventing molten steel from directly contacting the outside air. On the other hand, the inner and outer isolation cylinders can also effectively prevent molten steel from splashing into the argon gas ring.

[0019] The deflection mechanism can adjust the nozzle angle to adapt to different pouring scenarios, preventing the nozzle from pointing directly at the pouring area during the pouring process, further reducing the probability of metal droplets adhering to and clogging the nozzle; the telescopic tube facilitates the adjustment of the nozzle angle, ensuring that argon gas is sprayed out normally, guaranteeing the uniformity and stability of argon gas protection, and improving the smelting quality of mold steel.

[0020] The clamping mechanism's retractable / opening design allows for a good fit with the central injection pipe. At the same time, the clamping mechanism can firmly fix the device on the central injection pipe, further preventing device displacement and ensuring alignment accuracy. The compensation component can adjust the height of the top support to adapt to different specifications of ladle nozzles. Attached Figure Description

[0021] Figure 1 This is an overall structural diagram of an argon gas protective cover for casting mold steel according to the present invention.

[0022] Figure 2 This is a diagram showing the internal structure of the argon gas ring in an argon gas protective cover for casting mold steel according to the present invention.

[0023] Figure 3 This is a structural diagram of the exhaust port of an argon gas protective cover for casting mold steel according to the present invention.

[0024] Figure 4 This is a structural diagram of a compensation component for an argon gas protective cover used in the smelting and casting of mold steel according to the present invention.

[0025] Figure 5 This is a structural diagram of the inflation mechanism of an argon gas protective cover for casting mold steel according to the present invention.

[0026] Figure 6 This is a bottom view of the deflection mechanism of an argon gas protective cover for casting mold steel according to the present invention.

[0027] Figure 7This is a structural diagram showing the connection between the deflection motor and the internal gear ring of an argon gas protective cover for mold steel smelting and casting according to the present invention.

[0028] Figure 8 This is a structural diagram of the inner gear ring of an argon gas protective cover for mold steel smelting and casting according to the present invention.

[0029] Figure 9 This is a bottom view of the clamping mechanism of an argon gas protective cover for casting mold steel according to the present invention.

[0030] Figure 10 This is a schematic diagram of the clamping mechanism of an argon gas protective cover for smelting and casting mold steel according to the present invention.

[0031] Figure 11 This is a diagram of a frustum structure of an argon gas protective cover for casting mold steel according to the present invention.

[0032] Figure 12 This is a diagram of the turntable structure of an argon gas protective cover for casting mold steel according to the present invention.

[0033] Figure 13 This is a diagram of the plate structure of an argon gas protective cover for casting mold steel according to the present invention.

[0034] In the diagram: 1. Fixed base; 101. Lower limit sleeve; 2. Argon gas ring channel; 201. Inflation mechanism; 2011. Inlet pipe; 2012. Ring pipe; 2013. Jet nozzle; 2014. Telescopic pipe; 202. Outer isolation cylinder; 203. Deflection mechanism; 2031. Outer ring sleeve; 2032. Positioning seat; 2033. Rotating sleeve; 20331. Helical tooth pattern; 2034. Side seam; 2035. Bottom seam; 2036. Internal gear ring; 2037. Pin shaft; 2038. External rack; 204. Deflection motor; 2041. Drive gear; 3. Top support; 301. Upper limit sleeve; 302. Upper support plate; 3021. Vent hole; 3022. Hole shield; 303. Inner isolation cylinder; 304. Compensation component; 3041. Vertical rod; 3042. Compensation spring; 3043. Threaded section; 3044. Locking nut; 305. Corrugated cover; 4. Clamping mechanism; 401. Frustum; 4011. Clamping edge; 4012. Groove; 402. Turntable; 4021. Connecting rod; 4022. Inner hole; 403. Clamping plate; 4031. Upper pin; 4032. Lower pin; 4033. Arc-shaped surface; 404. Drive component. Detailed Implementation

[0035] The embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and should not be construed as limiting the scope of the invention.

[0036] Please see Figure 1-4An argon gas protective cover for casting mold steel smelting includes a fixed base 1 and an argon gas ring channel 2. A lower limit sleeve 101 is fixedly installed at the bottom of the fixed base 1, and the fixed base 1 is sleeved on the outside of the middle injection tube through the lower limit sleeve 101. An argon gas ring channel 2 is provided above the fixed base 1. An inflation mechanism 201 is provided inside the argon gas ring channel 2. The inflation mechanism 201 is connected to an external gas supply component through an air inlet pipe 2011. The inflation mechanism 201 fills the argon gas ring channel 2 with argon gas. An outer isolation cylinder 202 is fixedly installed in the middle of the argon gas ring channel 2. A top support 3 is provided above the argon gas ring channel 2. The top support 3 includes an upper support plate 302. 02 An upper limit sleeve 301 is fixedly installed on the upper part. The top support 3 is sleeved on the outside of the ladle nozzle through the upper limit sleeve 301. An inner isolation cylinder 303 is provided in the middle of the upper support plate 302. The lower end of the inner isolation cylinder 303 is inserted into the upper end of the outer isolation cylinder 202. There is a gap between the inner isolation cylinder 303 and the outer isolation cylinder 202. A corrugated cover 305 is provided between the argon gas ring channel 2 and the top support 3. The corrugated cover 305 is completely sleeved on the outside of the inner isolation cylinder 303 and the outer isolation cylinder 202. A compensation component 304 is provided between the sides of the argon gas ring channel 2 and the top support 3. The compensation component 304 is used to buffer the height change between the argon gas ring channel 2 and the top support 3.

[0037] Furthermore, a transparent observation window can be installed around the argon ring channel 2. The transparent observation window can be made of high-temperature resistant transparent quartz glass, which can withstand the high-temperature environment during the pouring process and facilitate operators to observe the working status of the jet nozzle 2013 inside the argon ring channel 2, and promptly detect problems such as blockage and leakage.

[0038] Both the lower limit sleeve 101 and the upper limit sleeve 301 are trumpet-shaped. The end of the lower limit sleeve 101 away from the fixed base 1 and the end of the upper limit sleeve 301 away from the top support 3 are enlarged ends. The inner wall of the enlarged end is provided with a wear-resistant layer, which also plays a better guiding role, so that the ladle nozzle and the middle injection pipe can automatically correct their positions through the guidance of the enlarged end, which is convenient for installation.

[0039] The upper support plate 302 has multiple vent holes 3021 with filters inside. The vent holes 3021 are evenly distributed on the upper support plate 302. The filters are made of high-temperature resistant metal filters, which can withstand high temperatures and prevent debris from entering. A baffle plate 3022 is provided above the vent holes 3021. The baffle plate 3022 can be fixedly connected to the upper support plate 302 with bolts to further prevent debris from falling onto the filters. It can be disassembled and cleaned regularly.

[0040] The compensation component 304 includes a vertical rod 3041. The lower end of the vertical rod 3041 is welded and fixed to the upper surface of the argon gas ring channel 2. The upper end of the vertical rod 3041 passes through the upper support plate 302. The vertical rod 3041 and the upper support plate 302 are in sliding fit. The upper end of the vertical rod 3041 is provided with a threaded section 3043. A locking nut 3044 is screwed onto the outside of the threaded section 3043. A compensation spring 3042 is fitted on the outside of the vertical rod 3041. The compensation spring 3042 is located between the argon gas ring channel 2 and the upper support plate 302, which can further enhance the buffering effect and absorb the vibration of the ladle nozzle. At the same time, by rotating the locking nut 3044, the height of the upper support plate 302 can be adjusted to adapt to ladle nozzles of different heights.

[0041] In this embodiment, the fixed base 1 is fitted onto the outside of the middle injection pipe via the lower limit sleeve 101. The locking nut 3044 of the compensation component 304 is adjusted to make the height of the device match the distance between the ladle nozzle and the middle injection pipe, thus completing the overall installation of the device. Before pouring, argon gas is first filled into the argon ring channel 2 through the air inlet pipe 2011 and the gas filling mechanism 201. Excess gas can be discharged through the exhaust port 3021, forming a sealed argon space inside the argon ring channel 2 and the corrugated cover 305, preventing direct contact between the molten steel and air during pouring. The inner isolation cylinder 303 and the outer isolation cylinder 202 form a protective space to prevent molten steel from splashing into the argon ring channel 2 and to prevent the gas filling mechanism from becoming blocked.

[0042] During the pouring process, the ladle nozzle is inserted into the upper limit sleeve 301. When the ladle nozzle experiences slight vibration or displacement, the compensation spring 3042 of the compensation component 304 absorbs the vibration impact. A gap exists between the inner isolation cylinder 303 and the outer isolation cylinder 202, which can alleviate the vibration or displacement of the ladle nozzle, preventing pouring obstruction, reducing the impact on pouring efficiency, and avoiding liquid metal leakage. The height of the top support of the compensation component can be adjusted by tightening the locking nut to accommodate ladle nozzles and intermediate pouring pipes of different specifications.

[0043] like Figure 5-8 In another embodiment, the inflation mechanism 201 includes a ring pipe 2012 and an air nozzle 2013. The ring pipe 2012 is fixedly installed inside the argon gas ring channel 2 by a bracket. The shape of the ring pipe 2012 matches the shape of the argon gas ring channel 2, both being annular structures. The air inlet pipe 2011 is connected to the ring pipe 2012. A valve is provided on the air inlet pipe 2011 to control the on / off state and flow rate of argon gas. The ring pipe 2012 and the air nozzle 2013 are connected by a telescopic pipe 2014. The telescopic pipe 2014 can be a high-temperature resistant corrugated telescopic pipe, which can flexibly extend, retract, and bend to adapt to the angle adjustment of the air nozzle 2013.

[0044] A deflection mechanism 203 is fixedly installed inside the argon gas annular channel 2. The deflection mechanism 203 is used to adjust the angle of the jet nozzle 2013. The deflection mechanism 203 includes an outer ring sleeve 2031 and an inner gear ring 2036. The outer ring sleeve 2031 is welded and fixed to the inner wall of the argon gas annular channel 2 via a connecting rod. Multiple positioning seats 2032 are evenly fixed on the outer side of the outer ring sleeve 2031. The positioning seats 2032 are evenly distributed along the circumference of the outer ring sleeve 2031. Each positioning seat 2032 is rotatably sleeved with a rotating sleeve 2033 via a bearing. A jet nozzle 2013 is welded and fixed to the outside of each rotating sleeve 2033. The inside of each rotating sleeve 2033 is provided with oblique teeth 20331. The outside of the outer ring sleeve 2031 is provided with... The outer ring 2031 has a bottom seam 2035 at the bottom of the edge seam 2034. The inner gear ring 2036 is rotatably disposed inside the outer ring 2031. The inner gear ring 2036 has an outer gear rack 2038 through it at the position corresponding to the edge seam 2034. The outer gear rack 2038 and the inner gear ring 2036 are integrally formed. The inner gear ring 2036 has a pin 2037 through it at the position corresponding to the bottom seam 2035. The pin 2037 can be welded and fixed to the inner gear ring 2036. The pin 2037 meshes with the oblique teeth 20331 on the inner side of the rotating sleeve 2033. When the inner gear ring 2036 rotates, the pin 2037 drives the rotating sleeve 2033 to rotate around the positioning seat 2032, thereby adjusting the angle of the jet nozzle 2013.

[0045] A deflection motor 204 is fixedly mounted on the outer side of the outer ring 2031 via a bracket. The deflection motor 204 is a high-temperature resistant servo motor, which can adapt to the high-temperature environment around the argon ring 2. The output end of the deflection motor 204 is equipped with a drive gear 2041 via a coupling. The drive gear 2041 meshes with the outer rack 2038. The drive gear 2041 drives the inner gear ring 2036 to rotate through the outer rack 2038, thereby adjusting the angle of the jet nozzle 2013. The deflection motor 204 can be controlled by a controller to achieve precise angle adjustment.

[0046] In this embodiment, an external gas supply assembly is connected via the air inlet pipe 2011. Opening the valve allows argon gas to be ejected from the nozzle 2013 through the ring pipe 2012 and telescopic pipe 2014, creating an argon protective atmosphere. When the nozzle angle needs adjustment, the deflection motor 204 is activated. The deflection motor 204 drives the outer rack 2038 via the drive gear 2041, which in turn rotates the inner gear ring 2036. The inner gear ring 2036, through the engagement of the pin 2037 and the helical teeth 20331 of the rotating sleeve 2033, drives the rotating sleeve 2033 to rotate, adjusting the angle of the nozzle 2013 and enabling precise adjustment of the argon gas injection direction. During argon filling, the nozzle can be adjusted to a horizontal position for faster filling of the space; during pouring, the nozzle can be adjusted to a vertically downward position to prevent molten steel from splashing onto the nozzle and causing blockage.

[0047] like Figure 9-13 In another embodiment, a clamping mechanism 4 is provided at the bottom of the fixed base 1. The clamping mechanism 4 is used to further clamp and position the injection tube. The clamping mechanism 4 includes a frustum 401 and a turntable 402. The upper part of the frustum 401 is welded and fixed to the fixed base 1, and the lower part of the turntable 402 is welded and fixed to the lower limit sleeve 101. The frustum 401 has a channel for the injection tube to pass through. A plurality of grooves 4012 are evenly provided at the bottom of the frustum 401. The grooves 4012 are evenly distributed along the circumference of the frustum 401. A plurality of connecting rods 4021 are evenly provided inside the turntable 402. The connecting rods 4021 are integrally formed with the turntable 402. Each connecting rod 4021 has an inner... Multiple clamping plates 403 are provided between the hole 4022, the frustum 401, and the turntable 402. The number of clamping plates 403 is the same as the number of grooves 4012 and connecting rods 4021. The upper side of the clamping plate 403 is clamped to the groove 4012 by the upper pin 4031, and the lower side of the clamping plate 403 is clamped to the inner hole 4022 by the lower pin 4032. The rotation of the turntable 402 can drive the clamping plate 403 to rotate around the frustum 401. The side of the clamping plate 403 is provided with an arc-shaped surface 4033. The arc-shaped surfaces 4033 of multiple clamping plates 403 are combined to form a complete circle. The arc-shaped surface 4033 is provided with anti-slip texture to enhance the friction between it and the injection tube and improve the clamping firmness.

[0048] The inner edge of the channel through which the central injection tube passes is provided with a retaining edge 4011. The retaining edge 4011 is integrally formed with the truncated cone 401 and is placed at the upper end of the central injection tube.

[0049] A drive assembly 404 is provided on the outer side of the frustum 401. In this embodiment, the drive assembly 404 adopts a gear drive method, including a drive motor, a drive gear, and a driven gear. The driven gear is fixedly mounted on the outer side of the turntable 402. The drive motor is fixedly connected to the frustum 401 through a bracket. The drive gear is provided at the output end of the drive motor. The drive gear and the driven gear mesh with each other. When the drive motor is working, the driven gear is driven to rotate through the drive gear, which in turn drives the turntable 402 to rotate, thereby realizing the contraction or opening of the clamping plate 403. In other embodiments, the drive assembly 404 can also be selected as a worm gear drive method. The worm gear is fixedly mounted on the outer side of the turntable 402, and the worm is connected to the output end of the drive motor. The worm gear and the worm mesh with each other and have a self-locking function, which can prevent the turntable 402 from rotating accidentally and improve the clamping stability.

[0050] In this embodiment, the fixed base 1 is fitted onto the outside of the middle injection pipe through the lower limit sleeve 101, so that the clamping edge 4011 is placed on the upper end of the middle injection pipe. The drive assembly 404 is started, driving the turntable 402 to rotate. The turntable 402 drives the clamping plate 403 to rotate around the frustum 401 through the connecting rod 4021, so that the arc surfaces 4033 of the multiple clamping plates 403 are tightly attached to the outer wall of the middle injection pipe, thus completing the clamping and fixing of the fixed base 1. The locking nut 3044 of the compensation assembly 304 is adjusted so that the height of the upper limit sleeve 301 is adapted to the ladle nozzle. The upper limit sleeve 301 is fitted onto the outside of the ladle nozzle, thus completing the overall installation of the device.

[0051] After the pouring is completed, close the external gas supply components and valves to stop the argon gas supply; start the drive component 404 to drive the turntable 402 to rotate in the reverse direction, causing the clamping plate 403 to open, releasing the clamp on the central injection pipe, and removing the entire device from the central injection pipe and ladle nozzle for cleaning and maintenance, so that it can be used next time.

Claims

1. An argon gas protective cover for casting in mold steel smelting, comprising a fixed base and an argon gas annular channel, characterized in that: A lower limit sleeve is fixedly installed at the bottom of the fixed base, and the fixed base is sleeved on the outside of the injection tube through the lower limit sleeve. An argon gas ring channel is provided above the fixed base. An inflation mechanism is provided inside the argon gas ring channel. The inflation mechanism is connected to an external gas supply component through an air inlet pipe. The inflation mechanism fills the inside of the argon gas ring channel with argon gas. An outer isolation cylinder is fixedly installed in the middle of the argon gas ring channel. A top support part is provided above the argon gas ring channel. The top support part includes an upper support plate. An upper limit sleeve is fixedly installed on the upper part of the upper support plate. The top support part is sleeved on the outside of the ladle nozzle through the upper limit sleeve. An inner isolation cylinder is provided in the middle of the upper support plate. The lower end of the inner isolation cylinder is inserted into the upper end of the outer isolation cylinder. There is a gap between the inner isolation cylinder and the outer isolation cylinder. A corrugated cover is provided between the argon gas ring channel and the top support part. The corrugated cover is completely sleeved on the outside of the inner isolation cylinder and the outer isolation cylinder. A compensation component is provided between the argon gas ring channel and the side of the top support part. The compensation component is used to buffer the height change between the argon gas ring channel and the top support part.

2. The argon gas protective cover for mold steel smelting and casting as described in claim 1, characterized in that: Both the lower limit sleeve and the upper limit sleeve are trumpet-shaped, with the end of the lower limit sleeve away from the fixed base and the end of the upper limit sleeve away from the top support being enlarged ends.

3. The argon gas protective cover for mold steel smelting and casting as described in claim 2, characterized in that: The upper support plate has multiple exhaust holes with filters inside, and a venting plate is provided above the exhaust holes.

4. The argon gas protective cover for mold steel smelting and casting as described in claim 3, characterized in that: The compensation component includes a vertical rod, the lower end of which is fixedly connected to the upper surface of the argon gas loop, the upper end of which passes through the upper support plate, and a threaded section is provided at the upper end of the vertical rod, with a locking nut screwed onto the outer side of the threaded section.

5. An argon gas protective cover for casting mold steel as described in claim 1, characterized in that: The inflation mechanism includes a ring tube and an air jet. The ring tube is fixedly installed inside the argon gas ring channel, and the shape of the ring tube matches the shape of the argon gas ring channel. The air inlet pipe is connected to the ring tube, and the ring tube and the air jet are connected by a telescopic tube.

6. An argon gas protective cover for mold steel smelting and casting as described in claim 5, characterized in that: A deflection mechanism is fixedly installed inside the argon gas ring channel. The deflection mechanism is used to adjust the angle of the jet nozzle. The deflection mechanism includes an outer ring sleeve and an inner gear ring. The outer ring sleeve is fixedly connected to the argon gas ring channel through a connecting rod. Multiple positioning seats are evenly fixed on the outer side of the outer ring sleeve. A rotating sleeve is rotatably sleeved on the outer side of each positioning seat. A jet nozzle is fixed on the outer side of each rotating sleeve. The inner side of each rotating sleeve is provided with oblique teeth. The outer side of the outer ring sleeve is provided with a side seam. The bottom of the outer ring sleeve is provided with a bottom seam. The inner gear ring is rotatably installed inside the outer ring sleeve. An outer gear rack is provided through the inner gear ring at the position corresponding to the side seam. A pin is provided through the inner gear ring at the position corresponding to the bottom seam. The pin cooperates with the oblique teeth on the inner side of the rotating sleeve.

7. An argon gas protective cover for mold steel smelting and casting as described in claim 6, characterized in that: A deflection motor is fixedly installed on the outer side of the outer ring sleeve. A drive gear is installed at the output end of the deflection motor. The drive gear meshes with the outer rack and drives the inner gear ring to rotate through the outer rack.

8. An argon gas protective cover for mold steel smelting and casting as described in claim 1, characterized in that: The fixed base is equipped with a clamping mechanism at its bottom, which is used to clamp and position the injection tube. The clamping mechanism includes a frustum and a turntable. The upper part of the frustum is fixedly connected to the fixed base, and the lower part of the turntable is fixedly connected to the lower limit sleeve. The frustum has a channel for the injection tube to pass through. Multiple grooves are evenly arranged at the bottom of the frustum. Multiple connecting rods are evenly arranged inside the turntable, and each connecting rod has an inner hole. Multiple clamping plates are engaged between the frustum and the turntable. The upper part of the clamping plate is engaged with the groove by an upper pin, and the lower part of the clamping plate is engaged with the inner hole by a lower pin. The rotation of the turntable can drive the clamping plates to rotate around the frustum. The sides of the clamping plates are provided with arc-shaped surfaces, and the arc-shaped surfaces of multiple clamping plates are combined to form a complete circle.

9. An argon gas protective cover for casting mold steel as described in claim 8, characterized in that: The inner edge of the channel through which the central injection tube passes is provided with a retaining edge, which is placed at the upper end of the central injection tube.

10. An argon gas protective cover for casting mold steel as described in claim 9, characterized in that: A drive assembly is provided on the outer side of the truncated cone, and the drive assembly is used to drive the turntable to rotate.

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