A large-caliber, low-pressure-loss molten lead-bismuth alloy flow regulating valve

Abstract

The present invention discloses a large-caliber, low-pressure-loss molten lead-bismuth alloy flow regulating valve, comprising a valve body and a cover plate, wherein the cover plate is provided with an electrically controlled pump gas component and an elastic compression structure; two rotary arms are rotatably connected to the outer side of the square seat, and a driving member is provided on the square seat; a control member for adjusting the position of a slider is provided in the square seat, and an elastic locking structure is provided on the cover plate and the sliding arm. In the present invention, firstly, by freely switching the valve electrically or manually, the flow regulating valve can be controlled accurately, simply and efficiently, and can be used in an emergency manner through manual control, thereby improving the reliability of the flow regulating valve; secondly, the rotating rotary arm forms a lever compression force on the valve stem, which is beneficial for the user to operate and control the relatively heavy valve plate; finally, the present application can accurately control the valve opening degree while meeting the efficient opening and closing of the valve.

Description

Technical Field

[0001] The present invention relates to the technical field of flow control valves, and in particular to a large-caliber, low-pressure-loss molten lead-bismuth alloy flow control valve. Background Art

[0002] Molten lead-bismuth alloy is an important liquid metal alloy, mainly composed of lead and bismuth. This alloy has a wide range of applications in industry and scientific research due to its unique physical and chemical properties.

[0003] The molten lead-bismuth alloy flow control valve plays a very important role in industrial applications, especially in situations where the flow of molten metal needs to be accurately controlled. The control valve can accurately control the flow of molten lead-bismuth alloy according to process requirements to ensure continuous and uniform material supply, which is crucial to maintaining process stability and improving product quality. Most of the flow control valves in the existing technology use electronically controlled hydraulic or pneumatic as the power output for opening and closing the valve. Although electric control has the advantages of precise control, convenient and intelligent, and timely response, it cannot avoid the hidden danger of failure.

[0004] The existing technology adopts manual control. To ensure the accuracy of manual control, most of them control the opening degree of the valve by screwing the valve stem connected to the valve body. This operation method has the problems of low control efficiency of the flow valve and inconvenient operation. Based on the manual control method of screwing, it is difficult for the existing technology to combine it with the above-mentioned electric control method, so that the existing technology cannot meet the switching of the control mode of the flow control valve.

[0005] Based on the above defects, a large-caliber, low-pressure-loss molten lead-bismuth alloy flow regulating valve is provided. Summary of the invention

[0006] The purpose of the present invention is to solve the above-mentioned problem and to propose a large-caliber, low-pressure-loss molten lead-bismuth alloy flow regulating valve.

[0007] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a large-caliber low-pressure-loss molten lead-bismuth alloy flow regulating valve, comprising a valve body and a cover plate installed on the valve body, a valve plate for controlling the opening and closing of the valve is slidably arranged in the valve body, a valve stem slidingly penetrating the cover plate is fixed on the valve plate, an electrically controlled pump gas component for closing the valve by pressing down the valve stem, and an elastic compression structure for driving the valve stem to reset upward to open the valve is arranged on the cover plate;

[0008] A square seat is fixedly provided on the top of the cover plate, and two rotary arms are rotatably connected to the outer side of the square seat, and two magnetic blocks are slidably connected in the square seat. The rotary arms and the magnetic blocks are rotatably connected via a cross bar that penetrates the square seat, and a driving member that controls the synchronous movement of the two magnetic blocks is provided on the square seat. When the two rotary arms move and open with the magnetic blocks, the sliding of the valve stem is not restricted by the rotary arms, and when the two magnetic blocks are in contact with each other, the rotation of the rotary arms can control the valve stem to slide along the cover plate;

[0009] A slider is slidably embedded in the square seat, and a control component for adjusting the position of the slider is provided in the square seat. A blocking rod for limiting the rotation range of the swing arm is fixed to the side end of the slider, and sliding arms are slidably connected to the opposite sides of the two swing arms. An elastic locking structure for limiting the arbitrary rotation of the swing arm is cooperatedly provided on the cover plate and the sliding arm.

[0010] Preferably, an equipment frame is fixed on the cover plate, an operating rod sliding through the equipment frame is fixed on the valve stem, a baffle is fixed on one end of the operating rod passing upward through the equipment frame, and the elastic compression structure includes a compression spring abutting between the equipment frame and the baffle.

[0011] Preferably, the electrically controlled pump air component includes an air chamber fixed on the top of the equipment frame and slidably embedded in cooperation with the baffle plate. An air pump is installed on the side end of the equipment frame. The air pump is electrically controlled, and the output end of the air pump is connected to the air chamber.

[0012] Preferably, the driving member includes a transverse axis rotatably connected to the square seat through a bracket, and a component for controlling the rotation of the transverse axis. The transverse axis slides through two magnetic blocks. A protrusion is formed on the inner wall of the magnetic block. A slide rail that cooperates with the protrusion to slide is formed on the side wall of the transverse axis, and the slide rail has a spiral structure.

[0013] Preferably, the component for controlling the rotation of the horizontal axis includes a knob fixed at both ends of the horizontal axis, a handle for human operation is fixed between the two knobs, a cam is fixed at the side end of the knob, and when the cam rotates with the knob and abuts against the cover plate, the friction force generated by the abutment will limit the random rotation of the knob.

[0014] Preferably, the control member comprises a screw rod rotatably connected in a square seat, and the screw rod is screwed together with a slider, and a handle coaxially fixed with the screw rod is rotatably connected to the outer side of the square seat.

[0015] Preferably, the elastic locking structure includes a tension spring arranged between the swing arm and the sliding arm, the sides of the sliding arm and the swing arm are screwed together with bolts that cooperate with the ends of the tension spring, an abutment frame slides through the two sliding arms, a sliding groove that cooperates with the abutment frame to slide through is formed in the swing arm, and a bending frame that acts as the abutment frame is fixed on the cover plate.

[0016] Preferably, baffles are fixedly provided at both ends of the abutment frame, an inclined surface is formed on the top of the bending frame to cooperate with the abutment frame for squeezing and sliding, a sleeve is provided between the two sliding arms to cooperate with personnel operation, and a side extension rod is fixedly provided between the two sliding arms and is slidably embedded in the inner side of the sleeve.

[0017] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0018] 1. In this application, by adjusting the distance between the swing arms, the valve can be freely switched between electric and manual control. When the electric control pump and gas components are normal, the electric control method is adopted to make the control of the flow control valve more accurate, simple and efficient. When the electric control pump and gas components fail, manual control can be used in an emergency, thereby achieving the purpose of improving the reliability of the flow control valve.

[0019] 2. In the present application, the entire valve opening and closing process is simple to operate, which is conducive to the user to timely control the opening and closing state of the valve, and the rotating swing arm forms a lever pressure force on the valve stem. When facing a large-diameter flow control valve, it is more conducive to the user to operate and control the heavier valve plate.

[0020] 3. In the present application, after the user completes the position adjustment of the square seat, the valve can be quickly opened and closed by rotating the rotary arm. Compared with the traditional manual twisting and slowly opening and closing the valve, the present application can accurately control the valve opening degree while meeting the requirements of efficient opening and closing of the valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the three-dimensional structure of a regulating valve provided according to an embodiment of the present invention is shown;

[0022] Figure 2 A schematic cross-sectional structure diagram of a regulating valve provided according to an embodiment of the present invention is shown;

[0023] Figure 3 A schematic diagram showing the structure of the top of the cover plate provided according to an embodiment of the present invention is shown;

[0024] Figure 4 It shows a schematic cross-sectional view of the structure of a square seat provided according to an embodiment of the present invention;

[0025] Figure 5 A schematic diagram of the matching structure of the rotary handle and the magnetic attraction block provided in an embodiment of the present invention is shown;

[0026] Figure 6 A schematic diagram of the internal structure of an air chamber provided according to an embodiment of the present invention is shown.

[0027] Legend:

[0028] 1. Valve body; 2. Valve plate; 3. Valve stem; 4. Operating lever; 5. Baffle; 6. Cover plate; 7. Square seat; 8. Swivel arm; 801, Slide groove; 9. Magnetic block; 10. Protrusion; 11. Rotary handle; 12. Cam; 13. Horizontal axis; 14. Slide rail; 15. Slider; 16. Baffle rod; 17. Screw; 18. Handle; 19. Slide arm; 20. Sleeve; 21. Abutment frame; 22. Baffle; 23. Bending frame; 24. Tension spring; 25. Bolt; 26. Equipment frame; 27. Air chamber; 28. Air pump; 29. ​​Compression spring. DETAILED DESCRIPTION

[0029] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0030] See also Figure 1-6 The present invention provides a technical solution: a large-caliber, low-pressure-loss molten lead-bismuth alloy flow regulating valve, comprising a valve body 1 and a cover plate 6 installed on the valve body 1, a valve plate 2 for controlling the opening and closing of the valve is slidably arranged in the valve body 1, a valve stem 3 slidingly penetrating the cover plate 6 is fixed on the valve plate 2, an electrically controlled pump gas component for closing the valve by pressing down the valve stem 3, and an elastic compression structure for driving the valve stem 3 to reset upward to open the valve is arranged on the cover plate 6.

[0031] The electronically controlled pump gas component adopts the existing electric control of pump gas pressure regulation to realize the electric control of valve opening and closing. At the same time, it can accurately adjust the amount of fluid passing through the valve to meet the normal use of the flow control valve. When the electronically controlled pump gas component is pumping gas pressurization, the valve plate 2 reduces the opening and closing degree of the valve under the action of the valve stem 3. When the electronically controlled pump gas component is about to reduce the air pressure, the valve plate 2 increases the opening and closing degree of the valve under the action of the elastic compression structure, thereby realizing timely and rapid control of the valve flow.

[0032] A square seat 7 is fixedly arranged on the top of the cover plate 6, and two swing arms 8 are rotatably connected to the outside of the square seat 7, and two magnetic blocks 9 are slidably connected in the square seat 7. The swing arms 8 and the magnetic blocks 9 are rotatably connected through a cross bar penetrating the square seat 7, and a driving member for controlling the synchronous movement of the two magnetic blocks 9 is arranged on the square seat 7. When the two swing arms 8 move and open with the magnetic blocks 9, the sliding of the valve stem 3 is not restricted by the swing arms 8. When the two magnetic blocks 9 are facing each other and fitting, the rotation of the swing arms 8 can control the valve stem 3 to slide along the cover plate 6. The distance between the two magnetic blocks 9 can be adjusted by the driving member, and then the distance between the swing arms 8 can be adjusted.

[0033] When the electronically controlled pump air component is in normal use, the two swing arms 8 are in an open state. At this time, the distance between the two swing arms 8 is greater than the diameter of the valve stem 3. Therefore, the sliding of the valve stem 3 relative to the cover plate 6 will not be affected by the swing arms 8. The electronically controlled pump air component can realize automatic control of the valve.

[0034] The magnetic poles at one end of the two magnetic blocks 9 are opposite. When the two magnetic blocks 9 are attracted to each other with opposite poles, the two swing arms 8 are in a close state. At this time, the distance between the two swing arms 8 is smaller than the diameter of the valve stem 3. When the electronically controlled pump gas component is in a power-off or damaged state, the user rotates the swing arm 8 so that the side wall of the swing arm 8 acts on the top of the valve stem 3, which can drive the valve stem 3 to slide relative to the cover plate 6, and the valve can be controlled by manual operation.

[0035] By adjusting the spacing of the swing arm 8 through the driving member, the user can freely switch between electric and manual control of the valve. When the electric-controlled pump and gas component can operate normally, the electric control method is adopted to make the control of the flow control valve more accurate, simple and efficient. When the electric-controlled pump and gas component is in a fault state, it can be used for emergency use through manual control, so that the pipeline used with the regulating valve can normally transport the molten lead-bismuth alloy, thereby achieving the purpose of improving the reliability of the flow control valve.

[0036] A slider 15 is slidably embedded in the square seat 7, and a control component for adjusting the position of the slider 15 is provided in the square seat 7. A stopper 16 for limiting the rotation range of the swing arm 8 is fixedly provided at the side end of the slider 15. Slide arms 19 are slidably connected to the opposite sides of the two swing arms 8. An elastic locking structure for limiting the arbitrary rotation of the swing arms 8 is cooperatively provided on the cover plate 6 and the slide arm 19.

[0037] When the elastic locking structure releases the rotation restriction on the swing arm 8, the valve stem 3 drives the valve plate 2 to move upward under the action of the elastic compression structure. At this time, the swing arm 8 is pushed by the end of the valve stem 3 and rotates and lifts upward along the square seat 7. Since the upward rotation angle of the swing arm 8 is limited by the blocking rod 16, the position of the slider 15 relative to the square seat 7 is adjusted by the control member. When the slider 15 is close to the axis of the cover plate 6, the rotation angle of the swing arm 8 is small, so that the height of the valve stem 3 sliding upward relative to the cover plate 6 is limited, resulting in a small opening and closing angle of the valve plate 2. When the slider 15 is far away from the axis of the cover plate 6, the rotation range of the swing arm 8 is large, and the opening and closing angle of the valve plate 2 is also large.

[0038] The position of the slider 15 relative to the square seat 7 is adjusted by the driving member, so as to adjust the opening and closing angle of the valve plate 2 under manual control. And through the arrangement of the above structure, after the user completes the position adjustment of the square seat 7, the user can quickly open and close the valve by rotating the swing arm 8. Compared with the traditional manual twisting and slowly opening and closing valve control method, the present application can accurately control the valve opening degree while meeting the requirements of efficient opening and closing of the valve.

[0039] Specifically, Figure 1-6 As shown, an equipment frame 26 is fixed on the cover plate 6, an operating rod 4 that slides through the equipment frame 26 is fixed on the valve stem 3, a baffle 5 is fixed on one end of the operating rod 4 that passes upward through the equipment frame 26, and the elastic compression structure includes a compression spring 29 that abuts between the equipment frame 26 and the baffle 5.

[0040] When the upward movement of the baffle plate 5 and the valve stem 3 is not restricted, the baffle plate 5 will lift the operating rod 4 upward under the elastic pressure of the compression spring 29, so as to drive the valve stem 3 fixed to the operating rod 4 to drive the valve plate 2 to lift upward. The equipment frame 26 is an N-shaped structure, and the height of the equipment frame 26 meets the rising height of the valve stem 3 when the valve plate 2 fully opens the valve.

[0041] Specifically, Figure 1-3 and Figure 6 As shown, the electrically controlled pump air component includes an air chamber 27 fixed on the top of the equipment frame 26 and slidably embedded in the baffle 5. An air pump 28 is installed on the side end of the equipment frame 26. The air pump 28 is electrically controlled, and the output end of the air pump 28 is connected to the air chamber 27.

[0042] The air pump 28 is a prior art, and is used to draw air into the air chamber 27, so that the baffle 5 moves downward under the pressure of the gas, overcoming the elastic force of the compression spring 29. The air pump 28 is connected to the air chamber 27 through a pipeline.

[0043] Specifically, Figure 5 As shown, the driving member includes a transverse axis 13 rotatably connected to the square seat 7 through a bracket, and a component for controlling the rotation of the transverse axis 13. The transverse axis 13 slides through two magnetic blocks 9. A protrusion 10 is formed on the inner wall of the magnetic block 9. A slide rail 14 that cooperates with the protrusion 10 to slide is formed on the side wall of the transverse axis 13, and the slide rail 14 has a spiral structure.

[0044] When the horizontal shaft 13 rotates, the inner wall of the spiral slide 14 will press the protrusion 10, driving the protrusion 10 to slide along the slide 14, and then driving the magnetic block 9 fixed to the protrusion 10 to slide along the square seat 7. The protrusion 10 is a hemispherical part, which is conducive to the inner wall of the slide 14 to compress and transmit it.

[0045] The components for controlling the rotation of the horizontal axis 13 include a knob 11 fixed at both ends of the horizontal axis 13, a handle for human operation is fixed between the two knobs 11, a cam 12 is fixed at the side end of the knob 11, and when the cam 12 rotates with the knob 11 and abuts against the cover plate 6, the friction force generated by the abutment will limit the random rotation of the knob 11.

[0046] The user rotates the handle 11 by operating the grip. When the cam 12 fixed on the handle 11 and the cover plate 6 are in a separated rotation state, the two magnetic blocks 9 remain in an attracted state under the action of magnetic force, ensuring that the two swing arms 8 are in a stable close state, which is conducive to the user controlling the sliding and lifting of the valve stem 3 by rotating the swing arms 8. In order to facilitate the swing arms 8 to compress the valve stem 3, the two swing arms 8 will not open in the opposite direction under the pressure of the arc side wall of the valve stem 3. Preferably, the valve stem 3 is designed to be a square structure.

[0047] Specifically, Figure 1-4 As shown, the control member includes a screw rod 17 rotatably connected in the square seat 7, and the screw rod 17 is screwed together with the slider 15, and a handle 18 coaxially fixed with the screw rod 17 is rotatably connected to the outer side of the square seat 7.

[0048] The handle 18 is composed of a rotary wheel and a grip installed perpendicularly to the rotary wheel. The rotary wheel is rotated by the grip to rotate the screw 17 fixed to the handle 18, and the slider 15 slides along the square seat 7 under the action of the screw force provided by the screw 17. Preferably, a marking scale corresponding to the valve opening degree is set on the square seat 7, and the user can adjust the position of the square seat 7 according to the marking scale, so that the valve opening can be accurately adjusted under manual control.

[0049] Specifically, Figure 1-4 As shown, the elastic locking structure includes a tension spring 24 arranged between the swing arm 8 and the sliding arm 19, and the sides of the sliding arm 19 and the swing arm 8 are screwed together with bolts 25 that are hung on the ends of the tension spring 24. An abutment frame 21 slides through the two sliding arms 19, and a sliding groove 801 is formed in the swing arm 8 to cooperate with the abutment frame 21 to slide through, and a bending frame 23 that acts on the abutment frame 21 is fixed on the cover plate 6.

[0050] When the user pulls the slide arm 19 downward, the swing arm 8 slidably connected to the slide arm 19 turns to the cover plate 6. As the abutment frame 21 slides and contacts with the top of the bending frame 23, the abutment frame 21 will be pressed to drive the slide arm 19 to extend outward along the swing arm 8. During this process, the abutment frame 21 will slide along the slide groove 801 until the swing arm 8 rotates and fits against the top of the cover plate 6. The abutment frame 21 passes over the bending frame 23, and the slide arm 19 will slide and retract along the slide arm 19 under the action of the tension spring 24, so that the abutment frame 21 is stuck in the bending groove formed by the bending frame 23. The bending frame 23 limits the swing arm 8 from rotating at will without human manipulation, thereby ensuring that the valve remains in a stable closed state.

[0051] When the valve needs to be opened, it is only necessary to pull the sliding arm 19 outwards so that the abutting frame 21 moves with the sliding arm 19 to avoid the bending frame 23. The entire valve opening and closing process is simple to operate, which is conducive to the user to timely control the opening and closing state of the valve. In addition, the rotating swing arm 8 forms a lever pressure force on the valve stem 3, which is more conducive to the user to operate and control the relatively heavy valve plate 2 when facing a large-diameter flow control valve.

[0052] Blocking plates 22 are fixedly provided at both ends of the abutment frame 21, and an inclined surface is formed on the top of the bending frame 23 to cooperate with the abutment frame 21 to squeeze and slide over. A sleeve 20 for personnel operation is arranged between the two sliding arms 19, and a side extension rod slidably embedded in the inner side of the sleeve 20 is fixedly provided between the two sliding arms 19.

[0053] The abutment frame 21 is a round rod structure. When it is in contact with the top of the abutment frame 21, the smooth outer wall of the abutment frame 21 can easily pass over the inclined top surface of the abutment frame 21. The setting of the baffle 22 is used to prevent the abutment frame 21 from sliding away from the sliding arm 19 and the swing arm 8. The setting of the sleeve 20 facilitates the user to synchronously control the two sliding arms 19 with one hand, and the sliding setting of the side extension rod and the sleeve 20 satisfies that the sliding arm 19 can move with the swing arm 8.

[0054] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A large-caliber, low-pressure-loss molten lead-bismuth alloy flow regulating valve, comprising a valve body (1) and a cover plate (6) mounted on the valve body (1), characterized in that: A valve plate (2) for controlling the opening and closing of the valve is slidably arranged in the valve body (1); a valve stem (3) is fixedly arranged on the valve plate (2) and slidably penetrates through a cover plate (6); an electrically controlled pumping component for closing the valve by pressing down the valve stem (3) and an elastic pressing structure for driving the valve stem (3) to return upward to open the valve is arranged on the cover plate (6); A square seat (7) is fixedly provided on the top of the cover plate (6), and two swing arms (8) are rotatably connected to the outer side of the square seat (7), and two magnetic blocks (9) are slidably connected in the square seat (7). The swing arms (8) and the magnetic blocks (9) are rotatably connected via a cross bar that passes through the square seat (7), and a driving member for controlling the synchronous movement of the two magnetic blocks (9) is provided on the square seat (7). When the two swing arms (8) move and open with the magnetic blocks (9), the sliding of the valve stem (3) is not restricted by the swing arms (8), and when the two magnetic blocks (9) are in contact with each other, the rotation of the swing arms (8) can control the valve stem (3) to slide along the cover plate (6); A slider (15) is slidably embedded in the square seat (7), a control member for adjusting the position of the slider (15) is provided in the square seat (7), a stopper (16) for limiting the rotation range of the swing arm (8) is fixedly provided at the side end of the slider (15), a sliding arm (19) is slidably connected to the opposite side of the two swing arms (8), and an elastic locking structure for limiting the arbitrary rotation of the swing arm (8) is cooperatively provided on the cover plate (6) and the sliding arm (19).

2. A large-caliber, low-pressure-loss molten lead-bismuth alloy flow control valve according to claim 1, characterized in that: The cover plate (6) is fixedly provided with an equipment frame (26), the valve stem (3) is fixedly provided with an operating rod (4) which slides through the equipment frame (26), and one end of the operating rod (4) which upwardly penetrates the equipment frame (26) is fixedly provided with a baffle (5), and the elastic compression structure comprises a compression spring (29) which abuts against the equipment frame (26) and the baffle (5).

3. A large-caliber, low-pressure-loss molten lead-bismuth alloy flow regulating valve according to claim 1, characterized in that: The electrically controlled pump air component comprises an air chamber (27) fixedly mounted on the top of the equipment frame (26) and slidably embedded in cooperation with the baffle plate (5); an air pump (28) is mounted on the side end of the equipment frame (26); the air pump (28) is electrically controlled, and an output end of the air pump (28) is connected to the air chamber (27).

4. A large-caliber, low-pressure-loss molten lead-bismuth alloy flow control valve according to claim 1, characterized in that: The driving member comprises a transverse shaft (13) rotatably connected to the square seat (7) via a bracket, and a component for controlling the rotation of the transverse shaft (13); the transverse shaft (13) slides through two magnetic blocks (9); a protrusion (10) is formed on the inner wall of the magnetic block (9); a slide rail (14) is formed on the side wall of the transverse shaft (13) and is adapted to slide with the protrusion (10); the slide rail (14) is in a spiral structure.

5. A large-caliber, low-pressure-loss molten lead-bismuth alloy flow control valve according to claim 4, characterized in that: The component for controlling the rotation of the horizontal axis (13) comprises a handle (11) fixed at both ends of the horizontal axis (13), a grip for human operation being fixedly arranged between the two handles (11), and a cam (12) being fixedly arranged at the side end of the handle (11). When the cam (12) rotates with the handle (11) and abuts against the cover plate (6), the friction force generated by the abutment will limit the random rotation of the handle (11).

6. A large-caliber, low-pressure-loss molten lead-bismuth alloy flow control valve according to claim 1, characterized in that: The control member comprises a screw rod (17) rotatably connected to the square seat (7), and the screw rod (17) is screwed together with the slider (15), and a handle (18) coaxially fixed with the screw rod (17) is rotatably connected to the outer side of the square seat (7).

7. A large-caliber, low-pressure-loss molten lead-bismuth alloy flow control valve according to claim 1, characterized in that: The elastic locking structure comprises a tension spring (24) arranged between the swing arm (8) and the sliding arm (19); the sides of the sliding arm (19) and the swing arm (8) are both screwed together with bolts (25) that are hung on the ends of the tension spring (24); an abutment frame (21) is slidably penetrated between the two sliding arms (19); a sliding groove (801) that is slidably penetrated by the abutment frame (21) is formed in the swing arm (8); and a bending frame (23) that acts on the abutment frame (21) is fixedly provided on the cover plate (6).

8. A large-caliber, low-pressure-loss molten lead-bismuth alloy flow control valve according to claim 7, characterized in that: Blocking plates (22) are fixedly provided at both ends of the abutment frame (21), an inclined surface is formed on the top of the bending frame (23) for cooperating with the abutment frame (21) to squeeze and slide over, a sleeve (20) for cooperating with personnel to operate is provided between the two sliding arms (19), and a side extension rod is fixedly provided between the two sliding arms (19) and is slidably embedded in the inner side of the sleeve (20).

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