A casting device for steel valves used in nuclear power plants

Abstract

The invention discloses a casting device for a steel valve for a nuclear power plant, relates to the technical field of casting equipment, and comprises a workbench, an upper die, a lower die, a moving mechanism, a pouring mechanism, and a cooling mechanism. The workbench is provided with two parallel slide rails, the upper die and the lower die are fixedly connected by bolts, and the slide rails are provided with a moving mechanism for moving the upper die and the lower die; a square shell is provided in the middle of the workbench, and a pouring mechanism for injecting molten steel is provided inside the square shell, the pouring mechanism comprises a pouring bucket, a conduit is coaxially installed on the pouring bucket, the pouring bucket and a pressure bucket are connected by a connecting pipe, a pull rod is coaxially slidably installed on the pressure bucket, a pressure head is fixedly installed at the lower end of the pull rod, and a flap is rotatably installed at the lower end of the pressure head; a cooling mechanism is provided on the square shell, and the invention realizes automatic insertion of the conduit into the pouring port of the lower die through the pouring mechanism, thereby reducing the risk of scalding of personnel, increasing the cooling mechanism, and reducing the risk of casting defects of the steel valve.

Description

Technical Field

[0001] The invention relates to the technical field of casting equipment, in particular to a casting device for a steel valve used in a nuclear power plant. Background Art

[0002] In the equipment of nuclear power plants, although valves are only accessories, their role cannot be ignored, because valves play an extremely important role in the normal, safe and reliable operation of nuclear power plants. Due to the large number of valves used, it can be said that almost every system in the power plant cannot do without valves. At present, the commonly used precision castings in the steel valve industry are solution casting and sand casting. Solution casting has certain limitations, such as: cumbersome process flow, long production cycle and other shortcomings. In the sand casting process, manual casting of the mold is often required. Since the temperature of liquid molten steel is as high as more than one thousand degrees, there is a risk of scalding to the operator during the casting process.

[0003] The Chinese invention patent with publication number CN114799071A discloses a sand casting pouring port tooling structure, which relates to the field of casting technology, and in particular to a sand casting pouring port tooling structure, which solves the disadvantage that impurities are easily blown into the pouring port when the casting is taken out after the existing sand casting. The structure comprises a pouring tray and a pouring bucket mounted in the pouring tray, a mounting plate is fixed to one side of the pouring tray by bolts, a lifting and adjusting motor is fixed to the bottom of the mounting plate by bolts, a stand is arranged on the top of the mounting plate, and the output shaft of the lifting and adjusting motor is connected to a first shaft that penetrates and extends into the stand. A rotating rod, the top outer side of the first rotating rod is sleeved with a first telescopic rod whose end passes through and extends to the outside of the top of the frame. The lifting and lowering adjustment motor is controlled in real time through PLC programming in the control device, thereby driving the first rotating rod connected to its output shaft to rotate, and pushing the first telescopic rod connected to its external thread to adjust the height of the casting bucket so that the casting bucket can be loaded and unloaded from the inside of the casting plate. The device still needs manual casting and cannot solve the above technical problems. Therefore, the present invention provides a casting device for steel valves for nuclear power plants that can effectively solve the above technical problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a casting device for steel valves for nuclear power plants which can be automatically cast.

[0005] In view of the above technical problems, the technical solution adopted by the present invention is as follows: a casting device for a steel valve for a nuclear power plant, comprising a workbench, an upper die, a lower die, a moving mechanism, a pouring mechanism, and a cooling mechanism. The workbench is provided with two parallel slide rails, the upper die and the lower die are fixedly connected by bolts, and the slide rails are provided with a moving mechanism for moving the upper die and the lower die; a square shell is provided in the middle of the workbench, the interior of the square shell is a working area, and a pouring mechanism for injecting molten steel is provided in the interior of the square shell, and the pouring mechanism comprises a pouring bucket vertically slidably installed in the square shell, a conduit is fixedly installed in the middle of the pouring bucket, a liquid inlet hole for molten steel to enter is provided at the lower end of the conduit, the pouring bucket and the pressure barrel are connected by a connecting pipe, a pull rod is coaxially slidably installed on the pressure barrel, a pressure head is fixedly installed at the lower end of the pull rod, an opening is provided on the pressure head, and a flap is rotatably installed at the lower end of the pressure head; a cooling mechanism for cooling the upper die and the lower die according to the pouring rate is provided on the square shell.

[0006] Furthermore, a heating wire is wound around the outside of the pouring barrel, a heat preservation barrel is coaxially fixedly installed on the pouring barrel, a pressure barrel is fixedly installed on the heat preservation barrel, an air inlet hole for filling nitrogen is provided at the upper end of the pressure barrel, a plurality of guide cylinders are provided at the lower end of the square shell, a plurality of guide rods are provided at the lower end of the heat preservation barrel, the guide cylinders and the guide rods are slidably connected by a strong spring, and are used to pour molten steel into the mold.

[0007] Furthermore, the lower end of the heat preservation barrel is hinged to the second end of the rotating rod, the side of the square shell is rotatably installed at the middle position of the rotating rod through a torsion spring, a slide groove is fixedly installed on the side of the square shell, a slide rod is vertically slidably installed in the slide groove, the lower end of the slide rod is hinged to the first end of the rotating rod, and an inclined block is fixedly installed on the side of the lower mold for automatically triggering the sensing component.

[0008] Furthermore, a vertical plate is fixedly installed on the side of the insulation barrel, a control rod is rotatably installed on the upper end of the vertical plate, the first end of the control rod is fixedly installed on the first end of the linkage rod, a roller is fixedly installed on the second end of the linkage rod, the pull-out rod is T-shaped, a long groove is fixedly installed in the middle position of the pull-out rod, the roller is arranged in the long groove, provides power for the movement of the pull-out rod, and uses pressure to drive the molten steel through the conduit into the cavity of the upper mold and the lower mold.

[0009] Furthermore, a first gear and a second gear are fixedly mounted on the control rod, a cylinder is fixedly mounted on the lower end of the vertical plate, a driving motor is fixedly mounted on the telescopic rod of the cylinder, a large gear and a small gear are coaxially fixedly mounted on the output shaft of the driving motor, a distance between the second gear and the first gear is greater than a thickness of the large gear and the small gear, the number of teeth of the first gear is greater than the number of teeth of the second gear, and the number of teeth of the large gear is greater than the number of teeth of the small gear, when the large gear and the second gear are in contact, the large gear and the second gear are meshed to form a gear transmission, and when the small gear is in contact with the first gear, the small gear is meshed with the first gear to form a gear transmission for adjusting the pouring rate.

[0010] Furthermore, a transmission is fixedly installed on the side of the square shell, the transmission input end is connected to the control rod, a rotating gear is fixedly installed on the output end of the transmission, a fixing frame is fixedly installed on the side of the square shell, a shift rod is vertically slidably installed on the fixing frame, the lower end of the shift rod is in contact with the teeth of the rotating gear, and the circulating water rate is adjusted according to the pouring speed.

[0011] Furthermore, the square shell is fixedly installed with an upper cooling pipe and a lower cooling pipe, the upper cooling pipe is arranged above the upper mold, and the lower cooling pipe is arranged below the lower mold, the upper cooling pipe and the lower cooling pipe are connected by two connecting pipes, and a water pipe bracket is fixedly installed on the side of the square shell, an external water pipe is fixedly installed on the water pipe bracket, and the external water pipe and the connecting pipe are connected through a central gear, which is used to cool the upper mold and the lower mold to avoid casting defects.

[0012] Furthermore, the central gear and the arc gear are meshed with each other, a pendulum rod is rotatably mounted on the fixed frame, a short slot is provided on one side of the pendulum rod, the upper end of the lever is arranged in the short slot, a magnetic block is fixedly mounted on the pendulum rod, and an electromagnet is fixedly mounted on the fixed frame below the magnetic block for resetting the pendulum rod.

[0013] Furthermore, baffle 1 is provided on the connecting pipe near one end of the central gear, and baffle 2 is provided at the center position of the central gear. When baffle 1 and baffle 2 do not overlap at all, circulating water is blocked from entering the connecting pipe. When there is a gap between baffle 1 and baffle 2, circulating water enters the connecting pipe, which is used to control the flow rate of circulating water.

[0014] Compared with the prior art, the present invention has the following advantages: (1) the pouring mechanism provided in the present invention includes a sensing component, a lifting component and a driving component. The sensing component contacts the sliding rod by means of an inclined block fixedly installed on the lower mold, thereby automatically triggering the lifting component. No manual operation is required during the process, and the present invention has the characteristics of a high degree of automation. (2) the lifting component and the driving component provided in the present invention can automatically adjust the pouring rate, automatically insert the catheter into the pouring port of the lower mold for pouring, thereby avoiding burns to the operator. When the pouring is completed, the catheter is automatically dropped, thereby reducing the number of human operations. (3) the cooling mechanism provided in the present invention can adjust different cooling rates according to different pouring rates, thereby ensuring the molecular changes of the steel valve during the casting process and greatly reducing the risk of casting defects. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0016] Figure 2 It is a schematic diagram of the structure of the mobile mechanism of the present invention.

[0017] Figure 3 It is a schematic diagram of the pouring mechanism structure of the present invention.

[0018] Figure 4 It is a schematic diagram of the structure of the lifting assembly of the present invention (front view).

[0019] Figure 5 This is a schematic diagram of the lifting assembly structure of the present invention (top view).

[0020] Figure 6 for Figure 5 Section view along AA direction.

[0021] Figure 7 It is a schematic diagram of the structure of the driving component of the present invention.

[0022] Figure 8 It is a schematic diagram of the cooling mechanism structure of the present invention (side view).

[0023] Fig. 9 It is a schematic diagram of the cooling mechanism structure of the present invention (front view).

[0024] Fig.10 for Fig. 9 A partial enlarged view of point B in the middle.

[0025] Fig.11 for Fig.10 Sectional view along CC direction.

[0026] Figure numbers: 1- workbench; 2- upper mold; 3- lower mold; 4- moving mechanism; 5- pouring mechanism; 6- cooling mechanism; 401- bracket; 402- moving motor; 403- mounting shaft; 404- sprocket; 405- chain; 406- guide rail; 501- inclined block; 502- slide rod; 503- slide groove; 504- rotating rod; 505- strong spring; 506- insulation barrel; 507- pouring barrel; 508- guide tube; 509- connecting pipe; 510- pressure barrel; 511- pulling rod; 512- pressure head; 513- flap; 514- heating wire; 515- vertical Plate; 516-driving motor; 517-cylinder; 518-large gear; 519-small gear; 520-control rod; 521-first gear; 522-second gear; 523-linking rod; 524-roller; 525-long groove; 601-upper cooling pipe; 602-lower cooling pipe; 603-speed transmission; 604-rotating gear; 605-water pipe bracket; 606-external water pipe; 607-shift lever; 608-rocker; 609-arc gear; 610-magnet; 611-electromagnet; 612-center gear; 613-connecting pipe; 614-fixed frame. DETAILED DESCRIPTION

[0027] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0028] Among them, the drawings are only used for illustrative explanations, and they only represent schematic diagrams rather than actual pictures, and should not be understood as limitations on this patent; in order to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of the actual product; for those skilled in the art, it is understandable that some well-known structures and their descriptions in the drawings may be omitted.

[0029] Example: Figure 1-Figure 11 The casting device of a steel valve for a nuclear power plant shown in the figure comprises a workbench 1, an upper mold 2, a lower mold 3, a moving mechanism 4, a pouring mechanism 5 and a cooling mechanism 6. Two parallel slide rails are provided on the workbench 1, and a moving mechanism 4 for moving the upper mold 2 and the lower mold 3 is provided on the slide rails. The upper mold 2 and the lower mold 3 are fixedly connected by a bolt assembly. A square shell is provided in the middle of the workbench 1, and the interior of the square shell is a working area. A pouring mechanism 5 is provided inside the square shell of the workbench 1, and a pouring port is provided at the lower end of the lower mold 3. The pouring mechanism 5 is used to inject molten steel into the pouring port of the lower mold 3 to cast the steel valve. A cooling mechanism 6 is provided in the square shell of the workbench 1. During the pouring process, the upper mold 2 and the lower mold 3 are cooled in real time according to the pouring rate to reduce casting defects.

[0030] The moving mechanism 4 includes a bracket 401, a moving motor 402, a mounting shaft 403, a sprocket 404, a chain 405 and a guide rail 406. The bracket 401 is fixedly installed on the side of the slide rail of the workbench 1, and the moving motor 402 is fixedly installed on the bracket 401. The output shaft of the moving motor 402 is coaxially fixedly installed with the mounting shaft 403, and the sprocket 404 is fixedly installed on the mounting shaft 403. The mounting shaft 403 is rotatably installed at both ends of the slide rail of the workbench 1. The sprocket 404 and the chain 405 are meshed to form a chain drive. The two sides of the lower mold 3 A groove is provided, and a guide rail 406 is fixedly installed on the groove of the lower mold 3. When in use, the chain 405 and the guide rail 406 are fixedly connected, and the fixed upper mold 2 and the lower mold 3 are moved to the slide rail of the workbench 1 by a crane, so that the chain 405 and the guide rail 406 are fixed, and the moving motor 402 is started. The output shaft of the moving motor 402 rotates to drive the installation shaft 403 to rotate, and the installation shaft 403 drives the sprocket 404 to rotate. The sprocket 404 drives the chain 405 to rotate through the chain transmission, and the chain 405 drives the guide rail 406 to move from left to right.

[0031] The pouring mechanism 5 includes a sensing component, a lifting component and a driving component. When the lower mold 3 moves to the middle of the square shell of the workbench 1, the sensing component is triggered, and the sensing component drives the lifting component to move. The guide tube 508 is inserted into the pouring port at the lower end of the lower mold 3, and the driving component is started to pour molten steel into the cavities of the upper mold 2 and the lower mold 3 to cast a steel valve.

[0032] The induction component includes an inclined block 501, a slide bar 502, a slide groove 503, a rotating rod 504, and a strong spring 505. The front end of the lower mold 3 is fixedly installed with an inclined block 501, and the lower part of the inclined block 501 is an inclined surface. The inclined block 501 is arranged above the slide bar 502. The slide groove 503 is fixedly installed on the side of the square shell of the workbench 1. The slide bar 502 is vertically slidably installed in the slide groove 503. The lower end of the slide bar 502 is rotatably installed with the first end of the rotating rod 504. The middle position of the rotating rod 504 is rotatably installed on the side of the square shell of the workbench 1 through a torsion spring. Under normal conditions, the first end of the rotating rod 504 is higher than the second end of the rotating rod 504. The second end of the rotating rod 504 is rotatably connected to the lower end of the insulation barrel 506. The lower end of the square shell of the workbench 1 is provided with a plurality of A guide cylinder, a plurality of guide rods are provided at the lower end of the insulation barrel 506, and the guide rods of the insulation barrel 506 and the guide cylinders of the workbench 1 are slidably connected by a strong spring 505. Under normal circumstances, the insulation barrel 506 is affected by gravity, and the strong spring 505 is in a compressed state. During operation, when the lower mold 3 moves to the middle position of the square shell of the workbench 1, the inclined surface of the inclined block 501 and the upper end of the slide bar 502 are in contact. As the lower mold 3 moves, the lower end of the inclined block 501 and the upper end of the slide bar 502 are in contact, and the slide bar 502 moves downward, and the slide bar 502 drives the rotating rod 504 to rotate, and the rotating rod 504 drives the insulation barrel 506 to move upward, and drives the lifting assembly to move upward, so that the guide tube 508 is inserted into the gate of the lower mold 3 for pouring.

[0033] The lifting assembly includes an insulation barrel 506, a pouring barrel 507, a guide tube 508, a connecting pipe 509, a pressure barrel 510, a pulling rod 511, a pressure head 512, a flap 513 and a heating wire 514. The insulation barrel 506 is coaxially fixed with the pouring barrel 507. The upper end of the pouring barrel 507 is higher than the upper end of the insulation barrel 506. The outer side of the pouring barrel 507 is wrapped with a heating wire 514 for heating the molten steel in the pouring barrel 507. The insulation barrel 506 is fixed on both sides. A pressure barrel 510 is fixedly installed, and the lower end of the pressure barrel 510 and the upper end of the pouring barrel 507 are connected through a connecting pipe 509. A pulling rod 511 is axially slidably installed inside the pressure barrel 510. An air inlet is provided at the upper end of the pressure barrel 510 for filling nitrogen. A conduit 508 is coaxially fixedly installed inside the pouring barrel 507. A liquid inlet is provided at the lower end of the conduit 508 for facilitating the entry of molten steel. The pulling rod 511 is T-shaped, and the pulling rod 511 is connected to a driving component. The pulling rod 511 and the conduit 508 are slidably connected. Pressure heads 512 are fixedly installed at both ends of the pulling rod 511, and an opening is provided on the pressure head 512. A flap 513 is rotatably installed at the lower end of the pressure head 512. When working, a certain amount of nitrogen is input into the pressure barrel 510 through a hose, and the conduit 508 is inserted into the pouring port of the lower mold 3. The driving component drives the pulling rod 511 to slide axially along the conduit 508. When the pulling rod 511 moves downward, the pulling rod 511 drives The pressure head 512 and the flap 513 move downward, and the flap 513 presses nitrogen into the pouring bucket 507 through the connecting pipe 509. Under the action of pressure, the molten steel in the pouring bucket 507 enters the cavity of the lower mold 3 and the upper mold 2 through the liquid inlet hole of the conduit 508. When the pulling rod 511 moves upward, the molten steel falls back into the pouring bucket 507. At the same time, nitrogen replenishes the gas in the cavity of the pressure barrel 510 through the hose to ensure that the inside of the pressure barrel 510 is in a constant pressure state.

[0034] The driving assembly includes a vertical plate 515, a driving motor 516, a cylinder 517, a large gear 518, a small gear 519, a control rod 520, a first gear 521, a second gear 522, a linkage rod 523, a roller 524 and a long slot 525. The vertical plate 515 is fixedly installed on the upper surface of the insulation barrel 506, and the cylinder 517 is fixedly installed on the side of the vertical plate 515. The telescopic rod of the cylinder 517 is fixedly connected to the driving motor 516. The large gear 518 and the small gear 519 are coaxially fixedly installed on the output shaft of the driving motor 516. The long slot 525 is fixedly installed in the middle position of the pulling rod 511, and a roller 524 is provided in the long slot 525. The control rod 520 is rotatably installed on the upper end of the vertical plate 515. The first end of the control rod 520 is fixedly installed with the first end of the linkage rod 523, and the second end of the linkage rod 523 is fixedly installed with the roller 524. The second gear 522 and the first gear 521 are fixedly installed on the control rod 520.

[0035] The number of teeth on the first gear 521 is greater than that on the second gear 522, the number of teeth on the large gear 518 is greater than that on the small gear 519, the spacing between the second gear 522 and the first gear 521 is greater than the thickness of the large gear 518 and the small gear 519, when the large gear 518 and the second gear 522 are in contact, the large gear 518 and the second gear 522 are meshed to form a gear transmission, when the small gear 519 and the first gear 521 are in contact, the small gear 519 and the first gear 521 are meshed to form a gear transmission, when working, the driving motor 516 is started, the output shaft of the driving motor 516 rotates to drive the large gear 518 to rotate, and the gear transmission drives the large gear 518 to rotate. The second gear 522 is driven to rotate, the second gear 522 drives the control rod 520 to rotate, the second gear 522 drives the linkage rod 523 to rotate, the linkage rod 523 drives the long slot 525 to move back and forth through the roller 524, the long slot 525 drives the pull-out rod 511 to slide axially along the guide tube 508, when the pouring rate needs to be changed, the cylinder 517 is started, the telescopic rod of the cylinder 517 is contracted, the small gear 519 and the first gear 521 are meshed, the first gear 521 drives the control rod 520 to rotate, and the pull-out rod 511 is driven to slide axially along the guide tube 508 through mechanical transmission, the sliding rate of the pull-out rod 511 is changed, and then the pouring rate is changed.

[0036] The cooling mechanism 6 includes an upper cooling pipe 601, a lower cooling pipe 602, a transmission 603, a rotating gear 604, a water pipe bracket 605, an external water pipe 606, a lever 607, a swing rod 608, an arc gear 609, a magnetic block 610, an electromagnet 611, a central gear 612, a connecting pipe 613 and a fixing frame 614. The upper cooling pipe 601 and the lower cooling pipe 602 are respectively installed on the square shell of the workbench 1. The upper cooling pipe 601 is arranged at the upper end of the upper mold 2, and the lower cooling pipe 602 is arranged at the lower end of the lower mold 3. The upper cooling pipe 601 and the lower cooling pipe 602 are connected by two connecting pipes. 613 are connected, the two connecting pipes 613 are respectively a water inlet and a water outlet, a water pipe bracket 605 is fixedly installed on the side of the square shell of the workbench 1, and an external water pipe 606 is fixedly installed on the water pipe bracket 605, the first ends of the two external water pipes 606 are connected with the circulating water, and the second ends of the external water pipes 606 and the connecting pipes 613 are connected through the central gear 612. When working, the circulating water enters the connecting pipe 613 through the external water pipe 606 and the central gear 612, and enters the upper cooling pipe 601 and the lower cooling pipe 602 through the connecting pipe 613 to cool the upper mold 2 and the lower mold 3.

[0037] A transmission 603 is fixedly installed on the side of the square shell of the workbench 1, the input end of the transmission 603 is connected to the control rod 520, and a rotating gear 604 is fixedly installed on the output end of the transmission 603. A fixing frame 614 is fixedly installed on the side of the square shell of the workbench 1, and a swing rod 608 is rotatably installed on the upper end of the fixing frame 614. A short groove is provided on one side of the swing rod 608, and a shifting rod 607 is provided in the short groove of the swing rod 608. The shifting rod 607 and the fixing frame 614 are slidably connected, and the lower end of the shifting rod 607 is in contact with the serrations of the rotating gear 604. A resetter is fixedly installed at the center position of the swing rod 608 for resetting the swing rod 608. Arc gears 609 are fixedly installed at both ends of the swing rod 608, and the arc gear 609 is meshed with the center gear 612. The center gear 612 is rotatably installed on the connecting tube 613, and a baffle 1 is provided on the connecting tube 613 near the end of the center gear 612. A baffle plate 2 is provided. When baffle plate 1 and baffle plate 2 do not overlap at all, circulating water is blocked from entering the connecting pipe 613. When there is a gap between baffle plate 1 and baffle plate 2, circulating water enters the connecting pipe 613. During operation, the control rod 520 rotates through the transmission 603 to accelerate the rotation of the rotating gear 604. Since the rotating gear 604 is in contact with the lower end of the shifting rod 607, the rotating gear 604 rotates to drive the shifting rod 607 to move back and forth, and the shifting rod 607 drives the swing rod 608 to swing back and forth, and the swing rod 608 drives the arc gear 609 to swing, and the arc gear 609 drives the central gear 612 to rotate, so that the baffle plate 2 of the central gear 612 and the baffle plate 1 of the connecting pipe 613 overlap intermittently, so that circulating water passes through. When the speed of the control rod 520 changes, the speed of the rotating gear 604 changes, thereby changing the overlap time of the baffle plate 2 of the central gear 612 and the baffle plate 1 of the connecting pipe 613, thereby controlling the cooling rate of the circulating water.

[0038] The resetter includes a magnetic block 610 fixedly mounted on the swing rod 608, and an electromagnet 611 is fixedly mounted on the fixing frame 614 below the magnetic block 610. The electromagnet 611 is magnetic when energized, and the magnetism between the electromagnet 611 and the magnetic block 610 is used to reset the swing rod 608.

[0039] The working principle of a casting device for a steel valve for a nuclear power plant disclosed in the present invention is as follows: an upper die 2 and a lower die 3 are fixed by bolts, the lower die 3 is moved to the slide rail of a workbench 1 by a crane, the guide rail 406 and the chain 405 are fixed, the moving motor 402 is started, the output shaft of the moving motor 402 rotates to drive the installation shaft 403 to rotate, the installation shaft 403 drives the sprocket 404 to rotate, the sprocket 404 drives the chain 405 to rotate, the chain 405 drives the lower die 3 to move forward through the guide rail 406, and when the lower die 3 moves to the center of the square shell of the workbench 1, the moving motor 402 is turned off.

[0040] During the movement of the lower mold 3, the inclined block 501 and the slide bar 502 are in contact. When the lower mold 3 moves to the center of the square shell of the workbench 1, the lower end of the inclined block 501 and the upper end of the slide bar 502 are in contact, and the slide bar 502 slides downward. The slide bar 502 drives the rotating rod 504 to swing, and the rotating rod 504 drives the insulation barrel 506 to move upward. At the same time, molten steel is stored in the pouring barrel 507, and the heating wire 514 is energized to make the molten steel in the pouring barrel 507 in a molten state. The vent hole on the pressure barrel 510 is connected to the hose, and the pressure barrel 510 is filled with nitrogen.

[0041] When the heat preservation barrel 506 moves upward, it drives the guide tube 508 to move upward. The guide tube 508 is inserted into the pouring port of the lower mold 3, and the driving motor 516 is started. The output shaft of the driving motor 516 rotates to drive the large gear 518 and the small gear 519 to rotate. In the initial state, the large gear 518 is meshed with the second gear 522, and the second gear 522 drives the control rod 520 to rotate. The control rod 520 drives the linkage rod 523 to rotate, and the long groove 525 is driven to reciprocate through the roller 524, driving the pull rod 511 along the axial direction of the guide tube 508. When the pull rod 511 moves downward, the pull rod 511 drives the pressure head 512 and the flap 513 to move downward, and the flap 513 presses the nitrogen into the pouring bucket 507 through the connecting pipe 509. Under the action of pressure, the molten steel in the pouring bucket 507 enters the cavity of the lower mold 3 and the upper mold 2 through the liquid inlet hole of the conduit 508. When the pull rod 511 moves upward, the molten steel falls back into the pouring bucket 507. At the same time, nitrogen replenishes the gas in the cavity of the pressure barrel 510 through the hose to ensure that the inside of the pressure barrel 510 is in a constant pressure state.

[0042] When the pouring rate needs to be switched, the cylinder 517 is started, the telescopic rod of the cylinder 517 is contracted, the pinion 519 is meshed with the first gear 521, the first gear 521 drives the control rod 520 to rotate, and the rotation speed of the control rod 520 is changed, thereby changing the moving speed of the pulling rod 511 and reducing the pouring rate.

[0043] The external water pipe 606 is connected to circulating water. When the control lever 520 rotates, the power is input into the transmission 603. The output end of the transmission 603 accelerates and drives the rotating gear 604 to rotate. The rotating gear 604 rotates and drives the lever 607 to slide back and forth axially. The lever 607 drives the swing rod 608 to swing back and forth. The swing rod 608 drives the arc gear 609 to rotate. The arc gear 609 drives the central gear 612 to move back and forth through gear meshing. The circulating water passes through the connecting pipe 613 and enters the upper cooling pipe. 601 and the lower cooling tube 602, the baffle 2 of the central gear 612 and the baffle 1 of the connecting tube 613 are intermittently overlapped to allow circulating water to pass through. When the speed of the control rod 520 changes, the speed of the rotating gear 604 changes, thereby changing the overlap time of the baffle 2 of the central gear 612 and the baffle 1 of the connecting tube 613, thereby controlling the cooling rate of the circulating water. At the same time, the fixing frame 614 is energized, and the magnetism is used to drive the magnetic block 610 to reset, thereby driving the rocker arm 608 to reset, so that the rocker arm 608 swings back and forth.

[0044] After the casting is completed, the mobile motor 402 is restarted, the output shaft of the mobile motor 402 rotates to drive the installation shaft 403 to rotate, the installation shaft 403 drives the sprocket 404 to rotate, the sprocket 404 drives the chain 405 to rotate, and the chain 405 drives the lower mold 3 to move forward through the guide rail 406. When the lower mold 3 moves to the side of the workbench 1, the lower mold 3 is moved out of the workbench 1 by a crane.

[0045] The present invention is not limited to the above-mentioned specific implementation modes. Various changes made by technicians in the relevant technical field based on the above-mentioned conception without creative work all fall within the protection scope of the present invention.

Claims

1. A casting device for a steel valve for a nuclear power plant, comprising a workbench (1), an upper die (2), and a lower die (3), wherein the workbench (1) is provided with two parallel slide rails, and the upper die (2) and the lower die (3) are fixedly connected by bolts, characterized in that: The machine also comprises a moving mechanism (4), a pouring mechanism (5), and a cooling mechanism (6); the moving mechanism (4) for moving the upper mold (2) and the lower mold (3) is provided on the slide rail; a square shell is provided in the middle of the workbench (1); the interior of the square shell is a working area; a pouring mechanism (5) for injecting molten steel is provided in the interior of the square shell; the pouring mechanism (5) comprises a pouring bucket (507) vertically slidably installed in the square shell; a guide tube (508) is fixedly installed in the middle of the pouring bucket (507); the guide tube (508) 508) is provided with a liquid inlet hole for molten steel to enter at the lower end, the pouring bucket (507) and the pressure bucket (510) are connected through a connecting pipe (509), the pressure bucket (510) is coaxially slidably mounted with a pull rod (511), a pressure head (512) is fixedly mounted at the lower end of the pull rod (511), an opening is provided on the pressure head (512), and a flap (513) is rotatably mounted at the lower end of the pressure head (512); the square shell is provided with a cooling mechanism (6) for cooling the upper mold (2) and the lower mold (3) according to the pouring rate; A heating wire (514) is wound around the outside of the pouring barrel (507), a heat preservation barrel (506) is coaxially fixedly installed on the pouring barrel (507), a pressure barrel (510) is fixedly installed on the heat preservation barrel (506), an air inlet hole for filling nitrogen is provided at the upper end of the pressure barrel (510), a plurality of guide cylinders are provided at the lower end of the square shell, a plurality of guide rods are provided at the lower end of the heat preservation barrel (506), and the guide cylinders and the guide rods are slidably connected via a strong spring (505); The lower end of the heat preservation barrel (506) is hinged to the second end of the rotating rod (504), the side of the square shell is rotatably installed at the middle position of the rotating rod (504) through a torsion spring, a slide groove (503) is fixedly installed on the side of the square shell, a slide rod (502) is vertically slidably installed in the slide groove (503), the lower end of the slide rod (502) is hinged to the first end of the rotating rod (504), and an inclined block (501) is fixedly installed on the side of the lower mold (3); A vertical plate (515) is fixedly installed on the side of the heat preservation barrel (506); a control rod (520) is rotatably installed on the upper end of the vertical plate (515); a first end of a linkage rod (523) is fixedly installed on the first end of the control rod (520); a roller (524) is fixedly installed on the second end of the linkage rod (523); the pull rod (511) is T-shaped; a long groove (525) is fixedly installed in the middle of the pull rod (511); and the roller (524) is arranged in the long groove (525); The control rod (520) is fixedly mounted with a first gear (521) and a second gear (522); the lower end of the vertical plate (515) is fixedly mounted with a cylinder (517); a drive motor (516) is fixedly mounted on the telescopic rod of the cylinder (517); a large gear (518) and a small gear (519) are coaxially fixedly mounted on the output shaft of the drive motor (516); the distance between the second gear (522) and the first gear (521) is greater than the distance between the large gear (518) and the small gear (519); The thickness of the wheel (519), the number of teeth of the first gear (521) is greater than the number of teeth of the second gear (522), the number of teeth of the large gear (518) is greater than the number of teeth of the small gear (519), when the large gear (518) and the second gear (522) are in contact, the large gear (518) and the second gear (522) are meshed to form a gear transmission, and when the small gear (519) and the first gear (521) are in contact, the small gear (519) and the first gear (521) are meshed to form a gear transmission; A transmission (603) is fixedly mounted on the side of the square housing, the input end of the transmission (603) is connected to the control rod (520), a rotating gear (604) is fixedly mounted on the output end of the transmission (603), a fixing frame (614) is fixedly mounted on the side of the square housing, a shifting rod (607) is vertically slidably mounted on the fixing frame (614), and the lower end of the shifting rod (607) is in contact with the saw teeth of the rotating gear (604); The square shell is fixedly installed with an upper cooling pipe (601) and a lower cooling pipe (602), the upper cooling pipe (601) is arranged above the upper mold (2), and the lower cooling pipe (602) is arranged below the lower mold (3), the upper cooling pipe (601) and the lower cooling pipe (602) are connected via two connecting pipes (613), a water pipe bracket (605) is fixedly installed on the side of the square shell, an external water pipe (606) is fixedly installed on the water pipe bracket (605), and the external water pipe (606) and the connecting pipe (613) are connected via a central gear (612).

2. A casting device for a steel valve for a nuclear power plant according to claim 1, characterized in that: The central gear (612) is meshed with the arc gear (609); a swing rod (608) is rotatably mounted on the fixed frame (614); a short slot is provided on one side of the swing rod (608); the upper end of the lever (607) is arranged in the short slot; a magnetic block (610) is fixedly mounted on the swing rod (608); and an electromagnet (611) is fixedly mounted on the fixed frame (614) below the magnetic block (610).

3. A casting device for a steel valve for a nuclear power plant according to claim 2, characterized in that: A baffle plate 1 is provided on one end of the connecting pipe (613) near the central gear (612), and a baffle plate 2 is provided at the center of the central gear (612). When the baffle plate 1 and the baffle plate 2 do not overlap at all, circulating water is blocked from entering the connecting pipe (613). When there is a gap between the baffle plate 1 and the baffle plate 2, circulating water enters the connecting pipe (613).

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