A stop valve assembly system

Abstract

The application discloses a stop valve assembling system, and belongs to the technical field of stop valves. The stop valve comprises a valve body, a valve rod, a valve clack, a valve seat and a valve door. The valve rod is arranged in the valve body along an axial direction. An end of the valve rod, which is deep into the valve body, is fixed with the valve clack. The outer side of the valve rod, which is close to the valve clack, is provided with the valve seat. The valve seat is threadedly connected with the valve door. The exhaust port axis of the valve body is perpendicular to the horizontally arranged valve rod. The assembling system comprises an assembling platform, a clamping piece arranged on the assembling platform and used for clamping the valve body, and a tightening assembly arranged on the assembling platform and corresponding to the side where the valve door is located. The upper side of the assembling platform is provided with a limiting assembly used for limiting the valve seat. The limiting assembly comprises a first limiting frame, a first rotating rod, a second limiting frame and a second rotating rod. The valve seat can be effectively clamped by the valve rod through a small-diameter valve port at the upper end, temporary positioning of the valve seat is realized, and therefore, the stop valve assembling operation is smoothly performed and the consistency of the assembling parameters is ensured.

Description

Technical Field

[0001] This invention belongs to the field of gate valve technology, and specifically relates to a gate valve assembly system. Background Technology

[0002] After the valve stem is assembled or welded, tightening the entire valve onto the stem is a crucial step. At this time, the valve seat on the stem needs to be effectively limited and fixed. Because the valve seat and valve stem are connected by a threaded pair, if the valve seat is not temporarily fixed at a preset angle or axial position during the tightening of the valve stem, the valve seat will rotate due to the friction torque of the threads. This will cause the valve seat to shift relative to the sealing end face of the valve body, thereby changing the compression of the sealing ring or disrupting the alignment between the valve disc and the valve seat. Ultimately, this will prevent the assembled valve from achieving the designed closing sealing pressure. However, in actual working conditions, the valve port on one side where the valve seat is located is blocked by the assembled valve body, making it impossible to insert a tool from that side for reverse clamping. The other valve port located at the upper end of the valve body usually has an inner diameter or through diameter that is much smaller than the opening width of a conventional universal wrench or the outer diameter of the sleeve. This means that even if the operator tries to use the upper valve port as an operating window, they cannot insert a standard wrench into the valve seat to secure it, which seriously restricts assembly efficiency and maintenance quality. Summary of the Invention

[0003] In view of this, the purpose of the present invention is to provide a gate valve assembly system that can extend through the small-diameter valve port at the upper end and effectively hold the valve seat, thereby achieving temporary positioning of the valve seat and ensuring the smooth progress of the gate valve assembly operation and the consistency of the assembly parameters.

[0004] To achieve the above objectives, the present invention provides the following technical solution: This invention discloses a gate valve assembly system. The gate valve includes a valve body, a valve stem, a valve disc, a valve seat, and a valve. The valve stem is axially arranged in the valve body, and a valve disc is fixed to one end of the valve stem that extends into the valve body. A valve seat is installed on the outer side of the valve stem near the valve disc, and the valve seat is threadedly connected to the valve. The axis of the exhaust port of the valve body is perpendicular to the horizontally arranged valve stem. The assembly system includes an assembly platform, a clamping component disposed on the assembly platform for clamping the valve body, a tightening assembly installed on the assembly platform corresponding to the side where the valve is located, and a limiting assembly for the valve seat installed on the upper side of the assembly platform. The limiting assembly includes a first limiting component. The valve body comprises a frame, a first rotating rod, a second limiting frame, and a second rotating rod. The upper ends of the first and second limiting frames are respectively connected to the vertically arranged first and second rotating rods. The first and second rotating rods are connected to a rotation drive device, which is connected to a lifting device. The lifting device drives the rotation drive device to move vertically, and the first and second rotating rods are rotated by the rotation drive device. The first and second limiting frames are symmetrically arranged with respect to the center plane of the valve body. The first and second limiting frames can be combined to form a hexagonal frame structure for limiting the valve seat.

[0005] Furthermore, the lifting device includes a gantry frame, a crossbeam, a lifting platform, a sliding frame, a chain, support wheels, a T-shaped support frame, and a hydraulic cylinder. The crossbeam is fixed on the gantry frame, the sliding frame is slidably installed on the gantry frame along the vertical direction, the two ends of the chain are connected to the crossbeam and the sliding frame respectively, the output end of the hydraulic cylinder is connected to the T-shaped support frame, the two ends of the T-shaped support frame are connected to support wheels, the support wheels cooperate with the chain, the sliding frame is fixedly connected to the lifting platform, and the rotation drive device is installed on the lifting platform.

[0006] Furthermore, a support and a first motor are installed on the lifting platform. Parallel guide rods and screws are rotatably mounted on the support, and the screws are connected to the first motor. The rotation drive device includes a first slide and a second slide that are slidably engaged with the first rotating rod and the second rotating rod, respectively. The first slide and the second slide are threadedly connected to the screw, and the guide rod passes through both the first slide and the second slide. The upper ends of the first rotating rod and the second rotating rod are connected to the first gear and the second gear, respectively, through a first universal coupling and a second universal coupling. The first gear and the second gear simultaneously mesh with a third gear arranged between them, and the third gear is connected to the second motor.

[0007] Furthermore, steps are formed on the inner sides of the first and second limiting frames, and the steps are adapted to the shape of the valve seat.

[0008] Furthermore, the lifting platform has a longitudinal opening slot, and the first rotating rod and the second rotating rod are slidably disposed in the opening slot.

[0009] Furthermore, a base is installed on the assembly platform, and a horizontal sliding groove is provided on the base. The tightening component includes a wrench, which is connected to a third motor. The third motor is connected to a slider, which is slidably disposed in the sliding groove. A reaction plate is fixed on the base at the end away from the valve body, and an elastic support device is installed between the reaction plate and the slider.

[0010] Furthermore, two sets of clamping components clamp the two ends of the valve body respectively. The clamping components include a clamping base and a pressure frame. Both ends of the clamping base and the pressure frame are fixed with connecting plates. A concave lower support surface is formed on the clamping base, and a concave upper pressing surface is formed on the pressure frame. A space for clamping the valve body is formed between the lower support surface and the lower pressing surface. Rubber strips are installed on the inner sides of both the lower support surface and the lower pressing surface.

[0011] The beneficial effects of this invention are as follows: This invention discloses a gate valve assembly system in which the widths of both the first and second limiting frames are designed to be smaller than the diameter of the upper exhaust port. When inserted, the planes of both frames are parallel to the axis of the valve body, allowing for smooth insertion into the valve body and avoiding interference with the valve stem. After inserting both frames into the valve body and rotating them 90°, they combine to form a hexagonal frame structure for limiting the valve seat. This structure effectively engages and limits the valve seat, achieving temporary positioning and improving the assembly efficiency of the gate valve. This ensures smooth assembly operations and consistency of assembly parameters. Attached Figure Description

[0012] To make the objectives, technical solutions, and beneficial effects of this invention clearer, the following figures are provided for illustration: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 This is a schematic diagram of the limit component. Figure 3 This is a schematic diagram of the limiting frame before rotation; Figure 4 This is a schematic diagram of the clamping component. Figure 5 This is a schematic diagram of the internal structure of a gate valve.

[0013] The following components are labeled in the attached diagram: Valve body 1, Valve stem 2, Valve disc 3, Valve seat 4, Valve 5, Exhaust port 6, Air inlet 7, Assembly platform 8, Clamping component 9, Tightening assembly 10, Limiting assembly 11, First limiting frame 12, First rotating rod 13, Second limiting frame 14, Second rotating rod 15, Gantry frame 16, Crossbeam 17, Lifting platform 18, Sliding frame 19, Chain 20, Support wheel 21, T-shaped support frame 22, Hydraulic cylinder 23, Support 24, First electric... 25. Machine, 26. Guide rod, 27. Screw, 28. First slide, 29. Second slide, 30. First universal coupling, 32. Second universal coupling, 33. First gear, 34. Second gear, 35. Third gear, 36. Second motor, 37. Step, 38. Opening slot, 39. Base, 40. Slide, 41. Wrench, 42. Third motor, 43. Slider, 44. Reaction plate, 45. Elastic support device, 46. Clamping base, 47. Pressure frame, 48. Connecting plate, 49. Rubber strip. Detailed Implementation

[0014] like Figures 1-5 As shown, the present invention discloses a gate valve assembly system. The gate valve has an existing structure and includes a valve body 1, a valve stem 2, a valve disc 3, a valve seat 4, and a valve 5. The valve stem 2 is arranged axially in the valve body 1. The valve disc 3 is fixed at one end of the valve stem 2 that extends into the valve body 1. The valve seat 4 is installed on the outside of the valve stem 2 near the valve disc 3. The valve seat 4 is threadedly connected to the valve 5. The valve 5 is installed near the air inlet 7 of the valve body 1. The axis of the exhaust port 6 of the valve body 1 is perpendicular to the horizontally arranged valve stem 2.

[0015] Specifically, the assembly system disclosed in this invention includes an assembly platform 8 and a clamping member 9 disposed on the assembly platform 8 for clamping the valve body 1. The clamping member 9 is used to clamp the valve body 1 to facilitate subsequent assembly. A tightening assembly 10 is installed on the assembly platform 8 corresponding to the side where the valve 5 is located. The tightening assembly 10 can drive the valve 5 to rotate so that the valve 5 can cooperate with the valve assembly to achieve fixation.

[0016] The assembly platform 8 is equipped with a limiting component 11 for the valve seat 4. The limiting component 11 is used to prevent the valve seat 4 from rotating or moving axially when the valve 5 is engaged with the valve seat 4. The limiting component 11 includes a first limiting frame 12, a first rotating rod 13, a second limiting frame 14, and a second rotating rod 15. The upper ends of the first limiting frame 12 and the second limiting frame 14 are respectively connected to the vertically arranged first rotating rod 13 and second rotating rod 15. The first rotating rod 13 and the second rotating rod 15 are connected to a rotation drive device. The rotation drive device is connected to a lifting device. The lifting device drives the rotation drive device to move vertically. The first rotating rod 13 and the second rotating rod 15 are driven to rotate by the rotation drive device. The first limiting frame 12 and the second limiting frame 14 are symmetrically arranged with respect to the center plane of the valve body 1. Both the first limiting frame 12 and the second limiting frame 14 are concave frame structures. After rotation, the grooves of the two are opposite each other. The first limiting frame 12 and the second limiting frame 14 can be combined to form a hexagonal frame structure for limiting the valve seat 4.

[0017] Since the valve stem 2 is axially arranged inside the valve body 1, and the valve seat 4 is installed close to the valve disc 3 and threadedly connected to the valve 5, the valve seat 4 is prone to rotation or axial movement due to thread friction torque during the tightening of the valve 5. Traditional manual assembly methods cannot guarantee the concentricity of the valve seat 4 and the valve stem 2, or the fitting accuracy of the sealing surface of the valve disc 3. In this invention, the symmetrically arranged first limiting frame 12 and second limiting frame 14 can extend into the valve body 1 under the action of the lifting device, and rotate and combine to form a hexagonal frame structure under the action of the rotation drive device. This structure forms a multi-faceted fitting limit with the outer contour of the valve seat 4, thereby effectively resisting the torsional torque and axial impact force transmitted to the valve seat 4 during the operation of the tightening assembly 10. This limiting method not only avoids the positional displacement of the valve seat 4 during the assembly process, but also fixes the relative assembly dimensions between the valve stem 2, the valve disc 3, and the valve seat 4, thereby ensuring the consistency of the opening and closing stroke of the valve disc 3 in each assembly operation, and significantly reducing the risk of internal leakage of the shut-off valve caused by loosening or eccentricity of the valve seat 4. Meanwhile, since the movement of the limit component 11 is automatically controlled by the lifting device and the rotation drive device, the entire positioning process does not require manual intervention by reaching into the valve body 1 for auxiliary alignment, which greatly improves operational safety.

[0018] In this embodiment, the lifting device includes a gantry frame 16, a crossbeam 17, a lifting platform 18, a sliding frame 19, a chain 20, support wheels 21, a T-shaped support frame 22, and a hydraulic cylinder 23. The crossbeam 17 is fixed on the gantry frame 16, and the sliding frame 19 is slidably mounted on the gantry frame 16 along the vertical direction. The two ends of the chain 20 are connected to the crossbeam 17 and the sliding frame 19, respectively. The output end of the hydraulic cylinder 23 is connected to the T-shaped support frame 22, and the two ends of the T-shaped support frame 22 are connected to support wheels 21, which cooperate with the chain 20. The sliding frame 19 is fixedly connected to the lifting platform 18, and a rotation drive device is mounted on the lifting platform 18. By using the chain 20 for transmission, the flexibility of the chain 20 can absorb some of the vertical impact vibration, ensuring that the lifting platform 18 has self-locking stability when stopped at any height. This prevents the limit frame from accidentally disengaging from the valve seat 4 due to gravity-induced sliding, providing a durable counterforce support foundation for the subsequent tightening process.

[0019] In this embodiment, a support 24 and a first motor 25 are installed on the lifting platform 18. A parallel guide rod 26 and a screw 27 are rotatably installed on the support 24, and the screw 27 is connected to the first motor 25. The rotation drive device includes a first slide block 28 and a second slide block 29 that are slidably engaged with the first rotating rod 13 and the second rotating rod 15, respectively. The first slide block 28 and the second slide block 29 are threadedly connected to the screw 27, respectively. The guide rod 26 passes through both the first slide block 28 and the second slide block 29. The upper ends of the first rotating rod 13 and the second rotating rod 15 are connected to the first gear 33 and the second gear 34 through the first universal coupling 30 and the second universal coupling 32, respectively. The first gear 33 and the second gear 34 simultaneously mesh with the third gear 35 arranged between them, and the third gear 35 is connected to the second motor 36.

[0020] When the first motor 25 drives the screw 27 to rotate, the guide rod 26 passes through the first slide 28 and the second slide 29 to play an anti-rotation guiding role. The first slide 28 and the second slide 29 will move towards or away from each other along the axial direction of the screw 27. Thus, according to the internal space size of the valve body 1 and the actual axial position of the valve seat 4, the distance between the first rotating rod 13 and the second rotating rod 15 is adjusted in real time, so that the first limiting frame 12 and the second limiting frame 14 can be accurately aligned with the limiting surfaces on both sides of the valve seat 4. After rotation, the two can fit tightly together to form a hexagonal limiting structure. At the same time, the second motor 36 meshes with the first gear 33 and the second gear 34 through the third gear 35, and transmits the rotational power to the two rotating rods through the first universal coupling 30 and the second universal coupling 32, ensuring that the two limiting frames are completely synchronized in rotation angle.

[0021] In this embodiment, a step 37 is formed on the inner side of the first limiting frame 12 and the second limiting frame 14, and the step 37 is adapted to the shape of the valve seat 4. The corresponding shoulder on the valve seat 4 will engage at the right angle corner of the step 37, so that when the valve 5 is tightened, even if it is subjected to an axial component force pointing into the valve body 1, the valve seat 4 cannot undergo axial backward displacement. This fundamentally ensures that the preset contact pressure between the valve disc 3 and the sealing surface of the valve seat 4 will not change due to the movement of the valve seat 4.

[0022] In this embodiment, the lifting platform 18 is provided with a longitudinal opening slot 38, and the first rotating rod 13 and the second rotating rod 15 are slidably disposed in the opening slot 38, which not only plays an auxiliary guiding role, but also prevents the rotating rod from swaying radially due to its own weight or rotational centrifugal force.

[0023] In this embodiment, a base 39 is installed on the assembly platform 8. A transverse sliding groove 40 is provided on the base 39. The tightening component 10 includes a wrench 41, which has an external hexagonal structure. The wrench 41 is connected to a third motor 42, which is connected to a slider 43. The slider 43 is slidably disposed in the sliding groove 40. A reaction plate 44 is fixed on the base 39 at the end away from the valve body 1. An elastic support device 45 is installed between the reaction plate 44 and the slider 43. When the third motor 42 drives the wrench 41 to rotate to tighten the valve 5, the threaded joint of the valve 5 will generate an axial feed force. This force will react through the wrench 41 to the slider 43, causing the slider 43 to tend to move away from the valve body 1. At this time, the elastic support device 45 is compressed, and its stored elastic potential energy is converted into a positive thrust on the slider 43, which just balances the axial reaction force generated by the thread feed. This ensures that the wrench 41 always maintains a stable axial contact with the head of the valve 5 throughout the tightening process, and avoids the wrench 41 from disengaging or slipping due to the accumulation of thread clearance.

[0024] In this embodiment, two sets of clamping members 9 clamp the two ends of the valve body 1 respectively. The clamping member 9 includes a clamping base 46 and a pressure frame 47. Both ends of the clamping base 46 and the pressure frame 47 are fixed with connecting plates 48. A concave lower support surface is formed on the clamping base 46, and a concave upper pressing surface is formed on the pressure frame 47. A space for clamping the valve body 1 is formed between the lower support surface and the lower pressing surface. Rubber strips 49 are installed on the inner sides of both the lower support surface and the lower pressing surface. The high coefficient of friction of the rubber strips 49 significantly increases the clamping friction, so that the valve body 1 can remain stationary under a large tightening torque, and the anti-rotation requirement can be met without excessively increasing the clamping force. The design of fixing connecting plates 48 at both ends of the clamping base 39 and the pressure frame 47 facilitates the use of bolts or quick clamps for clamping operations, and ensures the consistency of the clamping position each time while achieving quick loading and unloading.

Claims

1. A gate valve assembly system, the gate valve comprising a valve body, a valve stem, a valve disc, a valve seat, and a valve, wherein the valve stem is axially arranged in the valve body, a valve disc is fixed at one end of the valve stem extending into the valve body, a valve seat is installed on the outer side of the valve stem near the valve disc, the valve seat is threadedly connected to the valve, and the axis of the exhaust port of the valve body is perpendicular to the horizontally arranged valve stem, characterized in that: The assembly system includes an assembly platform, clamping components mounted on the assembly platform for holding the valve body, a tightening assembly mounted on the assembly platform corresponding to the side where the valve is located, and a limiting assembly for the valve seat mounted on the upper side of the assembly platform. The limiting assembly includes a first limiting frame, a first rotating rod, a second limiting frame, and a second rotating rod. The upper ends of the first and second limiting frames are respectively connected to the vertically arranged first and second rotating rods. The first and second rotating rods are connected to a rotation drive device, which is connected to a lifting device. The lifting device drives the rotation drive device to move vertically, and the first and second rotating rods are rotated by the rotation drive device. The first and second limiting frames are symmetrically arranged with respect to the center plane of the valve body. The second limiting frame can be assembled to form a hexagonal frame structure for limiting the valve seat; a base is installed on the assembly platform, and a transverse sliding groove is opened on the base. The tightening component includes a wrench, which is connected to a third motor. The third motor is connected to a slider, which is slidably disposed in the sliding groove. A reaction plate is fixed on the base away from the valve body, and an elastic support device is installed between the reaction plate and the slider; two sets of clamping components clamp the two ends of the valve body respectively. The clamping components include a clamping base and a pressure frame. Both ends of the clamping base and the pressure frame are fixed with connecting plates. A concave lower support surface is formed on the clamping base, and a concave upper pressing surface is formed on the pressure frame. A space for clamping the valve body is formed between the lower support surface and the upper pressing surface. Rubber strips are installed on the inner sides of the lower support surface and the upper pressing surface.

2. The shut-off valve assembly system according to claim 1, characterized in that: The lifting device includes a gantry frame, a crossbeam, a lifting platform, a sliding frame, a chain, support wheels, a T-shaped support frame, and a hydraulic cylinder. The crossbeam is fixed on the gantry frame, the sliding frame is slidably installed on the gantry frame along the vertical direction, the two ends of the chain are connected to the crossbeam and the sliding frame respectively, the output end of the hydraulic cylinder is connected to the T-shaped support frame, the two ends of the T-shaped support frame are connected to support wheels, the support wheels cooperate with the chain, the sliding frame is fixedly connected to the lifting platform, and the rotation drive device is installed on the lifting platform.

3. The shut-off valve assembly system according to claim 2, characterized in that: The lifting platform is equipped with a support and a first motor. Parallel guide rods and screws are rotatably mounted on the support, and the screws are connected to the first motor. The rotation drive device includes a first slide and a second slide that are slidably engaged with the first rotating rod and the second rotating rod, respectively. The first slide and the second slide are threadedly connected to the screw, and the guide rod passes through both the first slide and the second slide. The upper ends of the first rotating rod and the second rotating rod are connected to the first gear and the second gear, respectively, through the first universal coupling and the second universal coupling. The first gear and the second gear simultaneously mesh with a third gear arranged between them, and the third gear is connected to the second motor.

4. A shut-off valve assembly system according to claim 3, characterized in that: The inner sides of the first and second limiting frames are formed with steps that are adapted to the shape of the valve seat.

5. A shut-off valve assembly system according to claim 4, characterized in that: The lifting platform has a longitudinal opening slot, and the first rotating rod and the second rotating rod are slidably disposed in the opening slot.

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