Marine high-precision valve airtightness automatic detection equipment

Abstract

The invention relates to the technical field of valve detection, and particularly provides marine high-precision valve airtightness automatic detection equipment. Comprising a bearing table, the bearing table is vertically provided with a channel for introducing a circulating medium in a penetrating mode along a center shaft, the table top end of the bearing table is a lower sealing disc for bearing one end of a valve and sealing the valve, and an upper sealing disc matched with the lower sealing disc and used for pressing and sealing the other end of the valve is arranged; a buffer bracket for supporting the valve in an auxiliary manner is vertically mounted on the lower sealing disc in a penetrating and sliding manner; the equipment further comprises a pressing and clamping mechanism for laterally clamping and positioning the valve and pressing and sealing the valve between the upper sealing disc and the lower sealing disc. The detection equipment provided by the invention is used for carrying out air tightness detection on the marine butterfly valve, so that the problems of detection distortion and performance misjudgment caused by improper sealing fit between a sealing layer and a sealing disc in the butterfly valve in the existing detection operation process are avoided, and normal and smooth detection is ensured; and the misjudgment rate and the misjudgment repair rate of the butterfly valve are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of valve detection, and specifically provides a marine high-precision valve airtightness automatic detection device. Background Art

[0002] In a ship hull, there are various fluid medium pipeline systems, such as a ballast water system, a cooling water system, a fire protection system, a fuel system, etc. In various pipeline systems, various high-precision valves need to be installed to achieve the function control of the pipeline. Among them, a butterfly valve is a common type of valve that can achieve rapid opening and closing functions, and is widely used in the cooling water system, ventilation system, and fire protection system of the ship hull.

[0003] After the butterfly valve is produced and formed, the airtightness detection of the butterfly valve is an important link. Having reliable and effective airtightness can ensure the sealing performance and safety of the butterfly valve when used in the pipeline system. In the prior art, basically, a detection device supporting a specific model is used to detect the airtightness of the butterfly valve. In the detection device, a sealing disk matching the butterfly valve is assembled for port sealing, and a corresponding clamping mechanism is provided for clamping at the port sealing part; in addition, the sealing disk is generally provided with a sealing groove matching the valve sealing layer, and the valve sealing layer is mostly made of elastic rubber. During detection, the sealing layer of the valve needs to be embedded in the sealing groove.

[0004] During the detection process, one side port of the valve needs to be placed on a sealing disk. Considering that marine butterfly valves are generally large in size and heavy, one end of the butterfly valve is directly placed on the sealing disk, and the side clamping and positioning mechanism assembled in the device needs to be used for positioning to prompt the sealing layer to be embedded in the sealing groove. Such an operation has certain drawbacks for airtightness detection, and there is a certain probability of causing the detection result to be distorted and forming a misjudgment. Specifically, it is reflected in that: since the butterfly valve is directly placed on the sealing disk and the side clamping and positioning mechanism is used for positioning and alignment, and the sealing layer is easy to deform and has elasticity. First, when the butterfly valve is placed on the sealing disk, if the sealing layer and the sealing groove are not aligned, the sealing layer constitutes an elastic support contact, and the butterfly valve may be placed in an inclined state; furthermore, during side clamping and positioning, the butterfly valve is mainly pushed to move horizontally, and during the horizontal movement, the sealing layer is forced to be embedded in the sealing groove. When the butterfly valve is in an inclined state, the sealing layer is horizontally displaced and deformed, which may cause the sealing layer to finally not be completely aligned and embedded in the sealing groove, reducing the sealing fit between the sealing disk and the valve sealing layer, and even causing airtightness failure, affecting the normal detection process and the correct judgment of the detection result. Summary of the Invention

[0005] In order to solve the above problems, the present invention provides a marine high-precision valve airtightness automatic detection device for solving the problems mentioned in the above background art.

[0006] To achieve the above object, the present invention adopts the following technical solutions: A marine high-precision valve airtightness automatic detection device, including a supporting platform. The supporting platform is vertically penetrated along the central axis with a channel for introducing a flowing medium. The tabletop end of the supporting platform is a lower sealing plate for supporting and sealing one end of the valve. An upper sealing plate for pressing and sealing the other end of the valve is provided in a matching manner with the lower sealing plate. A buffer bracket for auxiliary supporting the valve is vertically and slidably installed through the lower sealing plate.

[0007] The device further includes a clamping mechanism for laterally clamping and positioning the valve and pressing and sealing the valve between the upper sealing plate and the lower sealing plate. The clamping mechanism includes a lifting platform located below the buffer bracket. A plurality of clamping members are horizontally slidably installed on the lifting platform. A driving assembly for driving the plurality of clamping members to synchronously laterally clamp and position the valve is also assembled on the lifting platform.

[0008] During the detection process, when the lifting platform is at the highest position, the valve is placed on the buffer bracket, and the bottom end of the buffer bracket is supported on the upper end surface of the lifting platform. After the driving assembly drives the plurality of clamping members to laterally clamp and position the valve, the buffer bracket drives the valve to synchronously descend with the lifting platform. When the lifting platform descends to the lowest position, it is in a separated state from the buffer bracket. The buffer bracket is lapped on the lower sealing plate, and the upper end surfaces of the buffer bracket and the lower sealing plate are flush. The valve is pressed and sealed between the upper sealing plate and the lower sealing plate.

[0009] Preferably, a plurality of avoidance grooves are circumferentially distributed on the upper end surface of the lower sealing plate, and a vertically guiding groove is provided in each avoidance groove. The buffer bracket includes a base ring located between the lower sealing plate and the lifting platform. A plurality of sliders are fixedly installed on the upper end surface of the base ring and slidably installed in the plurality of guiding grooves in a one-to-one correspondence. The top end of each slider is horizontally fixed with a supporting block for supporting one end of the valve. The avoidance groove is arranged in cooperation with the supporting block at the corresponding position. When the supporting block is lapped in the avoidance groove, the upper end surface of the supporting block is flush with the upper end surface of the lower sealing plate.

[0010] Preferably, sealing grooves for fitting and embedding with the sealing layer in the valve are provided on the sealing contact end surfaces between both the lower sealing plate and the upper sealing plate and the valve.

[0011] Preferably, the supporting platform further includes a column fixed to the bottom end of the lower sealing plate. The column vertically passes through the base ring and the lifting platform, and the lifting platform is vertically slidably installed on the column.

[0012] Preferably, the clamping member includes a sliding plate horizontally slidably installed on the bottom end surface of the lifting platform. A clamping block seat is fixed on the sliding plate. A side clamping block for laterally clamping the valve is fixed on the clamping block seat. The top end of the side clamping block is fixed with a pressing block for pressing and contacting the upper end surface of the upper sealing plate.

[0013] Preferably, the driving assembly includes a hinge seat that is vertically driven and slidably installed on the column. A plurality of link rods corresponding to the plurality of clamping members one by one are hinged on the hinge seat, and the other ends of the link rods are hinged on the slide plates at corresponding positions.

[0014] Preferably, the side clamping block is cylindrical, and a screw rod that is in threaded fit with the clamping block seat is fixed at the bottom end of the side clamping block.

[0015] Preferably, raised portions that protrude from the opposite end faces and can extend inwards to abut against the inner cavity side wall of the valve port are provided on the end faces of both the lower sealing disc and the upper sealing disc that are in sealing contact with the valve.

[0016] Preferably, a positioning portion that cooperates with the valve for positioning is provided on the end face of the upper sealing disc that is in sealing contact with the valve.

[0017] The above technical solution has the following advantages or beneficial effects: The present invention provides a marine high-precision valve airtightness automatic detection device for detecting the airtightness of a marine butterfly valve. The cooperation of the upper sealing disc and the lower sealing disc is used to seal the two channel ports of the butterfly valve. A buffer bracket for auxiliary support of the butterfly valve is installed on the lower sealing disc. The buffer bracket can prevent the butterfly valve from being directly placed on the lower sealing disc and can achieve horizontal placement. Through the side clamping and positioning structure in the clamping mechanism, the positioning of the butterfly valve can be completed in advance, so that the sealing part of the sealing lining is aligned with the sealing ring of the lower sealing disc. In addition, through the pressing structure of the clamping mechanism, the butterfly valve can be driven to synchronously descend in a state of always being horizontally placed through the buffer bracket, and the sealing part of the sealing lining can be aligned and inserted into the sealing ring of the lower sealing disc, ensuring the sealing effect of the cooperation between the sealing lining and the lower sealing disc, avoiding the problem of inaccurate sealing between the sealing layer and the sealing disc in the butterfly valve during the existing detection operation, resulting in detection distortion and performance misjudgment, ensuring the normal and smooth progress of the detection, reducing the misjudgment rate and the misjudgment repair rate of the butterfly valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] By reading the detailed description of the non-limiting embodiments with reference to the following drawings, the present invention and its features, shape, and advantages will become more obvious. The same reference numerals indicate the same parts in all the drawings. The drawings are not deliberately drawn to scale, and the focus is on showing the gist of the present invention.

[0019] Figure 1 is a perspective view of a marine high-precision valve airtightness automatic detection device provided by the present invention in the working state.

[0020] Figure 2 is a front view of a marine high-precision valve airtightness automatic detection device provided by the present invention in the working state.

[0021] Figure 3It is a top view of a high-precision marine valve airtightness automatic detection device provided by the present invention in the working state.

[0022] Figure 4 Is Figure 3 The cross-sectional view of A-A in

[0023] Figure 5 It is a three-dimensional structure diagram of a marine butterfly valve.

[0024] Figure 6 It is a three-dimensional state diagram of the slow bracket lapped on the support table.

[0025] Figure 7 It is a three-dimensional structure diagram of the support table.

[0026] Figure 8 It is a three-dimensional structure diagram of the slow bracket.

[0027] Figure 9 It is a three-dimensional structure diagram of the upper sealing plate.

[0028] Figure 10 It is a three-dimensional structure schematic diagram of a high-precision marine valve airtightness automatic detection device provided by the present invention.

[0029] Figure 11 It is a three-dimensional structure diagram of the clamping mechanism.

[0030] In the figure: 1. Support table; 11. Lower sealing plate; 111. Avoidance groove; 112. Guide groove; 12. Column; 13. Chassis; 2. Slow bracket; 21. Base ring; 22. Slide block; 23. Support block; 3. Upper sealing plate; 31. Positioning pin; 4. Clamping mechanism; 41. No. 1 hydraulic cylinder; 42. Lifting table; 421. Sliding sleeve; 422. Slide rail; 43. Clamping part; 431. Slide plate; 432. Clamping block seat; 433. Side clamping block; 4331. Screw; 434. Pressing block; 44. Driving component; 441. No. 2 hydraulic cylinder; 442. Hinge seat; 4421. Connecting plate; 443. Connecting rod; 5. Butterfly valve; 51. Valve seat; 511. Flange; 512. Stuffing box; 52. Sealing lining; 53. Valve plate; 531. Valve stem. Detailed implementation manners

[0031] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts belong to the scope of protection of the present invention.

[0032] To enable those skilled in the art to better understand the solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0033] As Figure 1 shown, a marine high-precision valve airtightness automatic detection device. In the present invention, this detection device is used to detect the airtightness of a marine butterfly valve 5. The structure of this butterfly valve 5 is as Figure 5 shown, and it mainly consists of a valve seat 51, a sealing lining 52, and a valve plate 53. The valve seat 51 is integrally cast and processed. At both ports of the passage of the valve seat 51 are flanges 511 for convenient butt joint installation. A stuffing box 512 is provided on the side wall of the valve seat 51. The valve plate 53 is located in the inner cavity of the passage of the valve seat 51 to control the on-off of the valve. The valve stem 531 passes through the stuffing box 512. The sealing lining 52 is internally attached as a sealing layer to the inner wall of the passage of the valve seat 51, and the sealing lining 52 extends and wraps around the ports of the two flanges 511.

[0034] As Figure 2 , Figure 3 , Figure 4 , Figure 6 and Figure 7 shown, this detection device includes a support table 1. The support table 1 includes a disk-shaped lower sealing plate 11, a cylindrical column 12 welded to the bottom end of the lower sealing plate 11, and a disk-shaped chassis 13 welded to the bottom end of the column 12. The lower sealing plate 11, the column 12, and the chassis 13 are coaxially installed, and the support table 1 is vertically penetrated along the central axis with a passage for introducing the liquid or gas for detection. In this embodiment, water is used as the medium to detect the airtightness state of the butterfly valve 5. A water pipe can be hermetically and fixedly installed in the passage extending from the chassis 13 end to the support table 1. The water pipe is connected to an external water system. A booster pump system is provided in the water system. The booster pump system is provided with a pressure sensor and a digital pressure gauge. The water pressure in the booster pump system is detected by the pressure sensor and converted into an electrical signal, which is processed and then transmitted to the digital pressure gauge, and finally the pressure value is displayed in digital form.

[0035] As Figure 5 , Figure 7 and Figure 9As shown, in order to achieve the sealing of the two flange 511 ends of the butterfly valve 5 during detection, an upper sealing plate 3 for sealing the other end of the valve is also provided in cooperation with the lower sealing plate 11; the upper sealing plate 3 is an independent structure and can be crimped on the flange 511 end of the butterfly valve 5 or directly removed. Sealing grooves that are fitted and embedded with the sealing lining 52 are provided on the sealing contact end faces between both the lower sealing plate 11 and the upper sealing plate 3 and the valve. The sealing grooves are annular groove structures composed of multiple concentric circular ring grooves. On the end faces of both the lower sealing plate 11 and the upper sealing plate 3 that are in sealing contact with the valve, there are protruding portions that protrude from the opposite end faces and can extend inward to tightly abut against the inner cavity side wall of the valve port. In the present invention, the protruding portions are frustum-shaped and are located within the rings of the sealing grooves, equivalent to the protruding circular ring portions of the pipe flange that is butted against the upper flange 511 end of the butterfly valve 5. After the protruding portions extend into the valve port inner cavity, they directly press against the sealing lining 52. Additionally, it should be noted that the purpose of the airtightness detection is to detect the airtight reliability of the butterfly valve 5 in the actual assembled pipeline system. Therefore, the upper sealing plate 3 and the lower sealing plate 11 can be regarded as the flange interface parts of the two pipes butted against the two flanges 511 of the butterfly valve 5, and the sealing grooves of both the upper sealing plate 3 and the lower sealing plate 11 can be considered to have the same structure as the sealing grooves of the flange interface parts in common butted pipes. The detection device provided by the present invention is specifically for the airtightness detection of a specific model of the butterfly valve 5, that is, both the upper sealing plate 3 and the lower sealing plate 11 are matched with the sealing lining 52. Multiple uniformly distributed bolt holes are provided on the flange 511. On the end face of the upper sealing plate 3 that is in sealing contact with the valve, multiple positioning pins 31 corresponding to the multiple bolt holes on the flange 511 are welded. When the upper sealing plate 3 is placed on the flange 511 end of the butterfly valve 5, the positioning pins 31 can be inserted into the bolt holes of the flange 511 to achieve rapid positioning, and then the wrapping end of the sealing lining 52 located at the flange 511 port position is aligned with the sealing groove of the upper sealing plate 3.

[0036] As Figure 5 , Figure 6 , Figure 7 and Figure 8 shown, a buffer bracket 2 for auxiliary support of one side flange 511 of the valve is vertically and slidably installed through the lower sealing plate 11. Four avoidance grooves 111 are evenly distributed in a circular pattern on the upper end face of the lower sealing plate 11, and a vertically guiding groove 112 is provided in each avoidance groove 111; the buffer bracket 2 includes a base ring 21 located below the lower sealing plate 11, and a column 12 passes through the base ring 21; four sliders 22 that are slidably installed in the four guiding grooves 112 in a one-to-one correspondence are welded to the upper end face of the base ring 21. The top end of each slider 22 is horizontally welded with a support block 23 for supporting the flange 511. The avoidance grooves 111 are arranged in cooperation with the support blocks 23 in the corresponding positions. When the support block 23 is lapped in the avoidance groove 111, the upper end face of the support block 23 is flush with the upper end face of the lower sealing plate 11. From Figure 6It can be seen that the supporting blocks 23 are distributed around the sealing groove of the lower sealing plate 11. Therefore, during the detection process, the wrapped part of the sealing lining 52 at the port of the flange 511 can avoid the four supporting blocks 23, and the flat end of the flange 511 of the butterfly valve 5 can be directly placed on the four supporting blocks 23, which can ensure horizontal support for the butterfly valve 5 and prevent tilting.

[0037] As Figure 2 , Figure 4 , Figure 10 and Figure 11 shown, the detection device further includes a clamping mechanism 4 for laterally clamping and positioning the valve and pressing and sealing the upper and lower ends of the valve between the upper sealing plate 3 and the lower sealing plate 11; the clamping mechanism 4 includes a first hydraulic cylinder 41 vertically fixed on the chassis 13 and a lifting platform 42 horizontally fixed on the output end of the first hydraulic cylinder 41. The lifting platform 42 is located below the base ring 21. A spline is provided on the column 12. The lifting platform 42 is disc-shaped. A sliding sleeve 421 is coaxially welded to the bottom end surface of the lifting platform 42. The lifting platform 42 is slidably mounted on the column 12 through the sliding sleeve 421; four slide rails 422 evenly distributed around the center in a circumferential manner are welded to the bottom end surface of the lifting platform 42. The guiding direction of the slide rails 422 is along the radial direction of the lifting platform 42. A clamping member 43 is correspondingly mounted on each slide rail 422. The clamping member 43 includes a sliding plate 431 slidably mounted in the slide rail 422. A clamping block seat 432 is welded to the end of the sliding plate 431 away from the center of the lifting platform 42. A side clamping block 433 for laterally clamping the valve is assembled at the top of the clamping block seat 432. The side clamping block 433 is cylindrical. A screw rod 4331 threadedly engaged with the clamping block seat 432 is welded to the bottom end of the side clamping block 433. A pressing block 434 in pressing contact with the upper end surface of the upper sealing plate 3 is fixed to the top end of the side clamping block 433 by bolts; when assembling the clamping member 43, first screw the side clamping block 433 onto the clamping block seat 432 by rotating the screw rod 4331, and then fix the pressing block 434 on the side clamping block 433. On the one hand, it enables the pressing block 434 to be located above the upper sealing plate 3 after being locked. On the other hand, the height of the pressing block 434 can be adjusted when the screw rod 4331 is tightened, so that when the pressing block 434 finally presses down on the top of the upper sealing plate 3, the butterfly valve 5 can be pressed between the upper sealing plate 3 and the lower sealing plate 11. During adjustment, pay attention to ensuring that the four pressing blocks 434 are at the same height.

[0038] As Figure 2 , Figure 4 and Figure 11As shown, a driving assembly 44 for driving four clamping members 43 to synchronously clamp and position the valve is further assembled on the lifting table 42; the driving assembly 44 includes a hinge seat 442 vertically and slidably fitted on the column 12, a second hydraulic cylinder 441 is vertically fixed on the lifting table 42 by bolts, a connecting plate 4421 is horizontally welded on the hinge seat 442, and the connecting plate 4421 is fixed to the output end of the second hydraulic cylinder 441 by bolts; four connecting rods 443 corresponding to the four clamping members 43 are hinged on the hinge seat 442, and the other ends of the connecting rods 443 are hinged on the sliding plates 431 at corresponding positions.

[0039] As Figure 1 and Figure 2 As shown, during the detection process, when the lifting table 42 is at the highest position, the valve is placed on the buffer bracket 2, and the bottom end of the buffer bracket 2 is supported on the upper end surface of the lifting table 42; after the driving assembly 44 drives the four clamping members 43 to clamp and position the valve laterally, the lifting table 42 descends from the highest position, and the buffer bracket 2 drives the valve to descend synchronously with the lifting table 42; when the lifting table 42 descends to the lowest position, the lifting table 42 is separated from the buffer bracket 2, the buffer bracket 2 is lapped on the lower sealing plate 11, and the upper end surface of the buffer bracket 2 is flush with the upper end surface of the lower sealing plate 11, and the upper and lower ends of the valve are tightly sealed between the upper sealing plate 3 and the lower sealing plate 11.

[0040] The present invention provides a marine high-precision valve airtightness automatic detection device. In this embodiment, water is used as the circulating medium to detect the airtightness of the butterfly valve 5. During actual detection, it is necessary to detect the airtightness at multiple positions between the two flange 511 ends, between the valve plate 53 and the sealing lining 52, and between the valve stem 531 and the stuffing box 512; since the valve stem 531 on the valve plate 53 passes through the stuffing box 512, and in addition, the valve plate 53 controls the on-off of the two flange 511 ports, therefore, during actual detection, it is necessary to first perform the first-round detection of the airtightness between the two flange 511 ends and between the valve stem 531 and the stuffing box 512. When the first-round detection confirms that the airtightness is effective, the second-round detection can be carried out to detect the airtightness between the valve plate 53 and the sealing lining 52. The specific detection process is as described below:

[0041] The first round of air tightness test is carried out to test the air tightness between the two flanges 511 of the butterfly valve 5 and the valve stem 531 and the stuffing box 512. Specifically, the flange 511 of one end of the butterfly valve 5 is placed flat on the four support blocks 23, and then the positioning pin 31 of the upper sealing disk 3 is aligned and inserted into the bolt hole of the upper flange 511, so that the upper sealing disk 3 is buckled and placed on the upper flange 511. At this time, due to the support of the sealing liner 52, the lower end surface of the upper sealing disk 3 is not completely pressed and contacted with the upper flange 511. On the end surface, then, start the No. 2 hydraulic cylinder 441 to drive the articulated seat 442 to slide down along the column 12, thereby pulling the slide plate 431 along the slide rail 422 to slide toward the center of the lifting platform 42 through the connecting rod 443, and then with the cooperation of the four side clamping blocks 433, the clamping butterfly valve 5 is automatically pushed to complete the side clamp positioning, and the central axis of the flange 511 is automatically aligned with the central axis of the lower sealing disk 11, so that the sealing groove of the lower sealing disk 11 is aligned with the sealing part of the sealing liner 52 located at the lower flange 511.

[0042] Next, the No. 1 hydraulic cylinder 41 is started, driving the lifting platform 42 to descend. When the lifting platform 42 is in a supporting state for the base ring 21, the slow bracket 2 is synchronously lowered with the descent of the lifting platform 42. At the same time, the butterfly valve 5 is synchronously lowered with the descent of the slow bracket 2 while maintaining the side clamp positioning. When the slow bracket 2 is lowered until the support block 23 falls into the avoidance groove 111 and overlaps with the end surface of the avoidance groove 111, the slow bracket 2 cannot continue to descend, and the flange 511 below the butterfly valve 5 falls on the upper end surface of the lower sealing disk 11 and the end surface jointly formed by the four support blocks 23, and the lifting platform 42 is lowered. It continues to descend and separates from the base ring 21, and the pressure block 434 begins to press on the top surface of the upper sealing disk 3. As it continues to descend until the output rod of the No. 1 hydraulic cylinder 41 is fully retracted, the upper and lower flanges 511 of the butterfly valve 5 are pressed between the upper sealing disk 3 and the lower sealing disk 11, and the two ends of the sealing liner 52 are correspondingly pressed and embedded in the sealing grooves of the upper sealing disk 3 and the lower sealing disk 11. Subsequently, the valve plate 53 is opened to put the butterfly valve 5 in a fully open state. At this time, the sealing of the two flanges 511 ends of the butterfly valve 5 by the upper sealing disk 3 and the lower sealing disk 11 constitutes a fully sealed state by default.

[0043] Subsequently, water is injected into the inner cavity of the closed butterfly valve 5 through the pipeline system at the chassis 13 until it is completely filled, and the water is pressurized to the set pressure value by the booster pump system in the pipeline system. The magnitude of the pressure value is detected by the pressure sensor in the booster pump system and displayed on the digital pressure gauge. After reaching the set pressure value, pressure holding is carried out, and then the outside of the butterfly valve 5 can be blown by an air gun to clean the water mist and water droplets that may exist on the outside of the butterfly valve 5 to avoid false judgment. Then, continuous pressure holding is carried out. When the set pressure holding time is reached, observe whether the pressure on the digital pressure gauge drops significantly, and observe whether there is water overflow at the detection position outside the butterfly valve 5. When the pressure on the digital pressure gauge decreases significantly and water overflow can be observed, it can be seen that there is a problem with the airtightness at the water overflow position and it does not meet the standard. When the change in the pressure value of the digital pressure gauge is small and within the allowable range of the design, and no water overflow is observed, it indicates that the airtightness at the positions of the two flange 511 ends of the butterfly valve 5 and between the valve stem 531 and the stuffing box 512 meets the standard.

[0044] After passing the first-round airtightness test, if the airtightness test is qualified, the second-round test can be directly carried out. If the airtightness test is unqualified, the parts that can be repaired are repaired, and the parts that cannot be repaired are directly scrapped. After the repaired parts pass the test verification, the second-round test can be continued.

[0045] The second-round airtightness test is carried out to detect the airtightness between the valve plate 53 and the sealing lining 52. The operation process of the second-round test is basically the same as that of the first-round test and will not be elaborated here. The difference is that during the second-round test, the upper sealing plate 3 mainly plays a role of pressing down and clamping the butterfly valve 5, and the sealing performance of the upper flange 511 end is not considered. After the butterfly valve 5 is positioned and clamped from the side and pressed down tightly, the valve plate 53 needs to be closed, so that the inner cavity space below the valve plate 53 of the butterfly valve 5 is default to form a closed state. During the test, water is injected into this inner cavity. After the pressure holding is completed, observe the pressure value on the digital pressure gauge. If the pressure value drops significantly, it indicates that the airtightness between the valve plate 53 and the sealing lining 52 is invalid. When the pressure value remains basically unchanged or the decrease value is within the allowable range of the design, it indicates that the airtightness is reliable and effective.

[0046] The present invention provides a marine high-precision valve airtightness automatic detection device for detecting the airtightness of a marine butterfly valve 5. The cooperation of an upper sealing plate 3 and a lower sealing plate 11 is adopted to seal the two channel ports of the butterfly valve 5. A buffer bracket 2 for auxiliary support of the butterfly valve 5 is installed on the lower sealing plate 11. Through the buffer bracket 2, the butterfly valve 5 can be prevented from being directly placed on the lower sealing plate 11 and can be placed horizontally. Through the side clamping and positioning structure in the clamping mechanism 4, the positioning of the butterfly valve 5 can be completed in advance, so that the sealing part of the sealing lining 52 is aligned with the sealing ring of the lower sealing plate 11. In addition, through the pressing structure of the clamping mechanism 4, the butterfly valve 5 can be driven by the buffer bracket 2 to synchronously descend in a horizontally placed state all the time, and the sealing part of the sealing lining 52 can be aligned and inserted into the sealing ring of the lower sealing plate 11, ensuring the sealing effect of the cooperation between the sealing lining 52 and the lower sealing plate 11, avoiding the problems of detection distortion and performance misjudgment caused by the unsealed fit between the sealing layer and the sealing plate in the butterfly valve 5 in the existing detection operation process, ensuring the normal and smooth progress of the detection, reducing the misjudgment rate and the misjudgment repair rate of the butterfly valve 5.

[0047] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0048] In the description of the present invention, it should also be noted that unless otherwise clearly specified and limited, the terms "set", "connected", "installed", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood through specific situations.

[0049] The preferred embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications without departing from the technical solution of the present invention, or modify it into an equivalent embodiment with equivalent changes, which does not affect the essence of the present invention. Therefore, any simple modification, equivalent change and modification made to the above embodiments based on the technical essence of the present invention without departing from the technical solution of the present invention still fall within the scope of protection of the technical solution of the present invention.

Claims

1. A marine high-precision valve air tightness automatic detection device, characterized by: The support platform (1) comprises a support platform (1), the support platform (1) is provided with a passage for passing a circulating medium vertically extending along a central axis, a lower sealing plate (11) is provided at a table top end for supporting and sealing one end of a valve, and an upper sealing plate (3) is provided in conjunction with the lower sealing plate (11) for pressing and sealing the other end of the valve; a buffer bracket (2) is vertically and slidably installed on the lower sealing plate (11) for auxiliary support of the valve; The device also includes a clamping mechanism (4) for laterally clamping and positioning the valve and for pressing and sealing the valve between the upper sealing plate (3) and the lower sealing plate (11); the clamping mechanism (4) includes a lifting platform (42) located below the slow bracket (2); a plurality of clamping members (43) are horizontally slidably mounted on the lifting platform (42); and a driving component (44) for driving the plurality of clamping members (43) to synchronously clamp and position the valve on the side is also mounted on the lifting platform (42); During the inspection, when the lifting platform (42) is at the highest position, the valve is placed on the slow support (2), and the bottom end of the slow support (2) is supported on the upper end surface of the lifting platform (42); After the driving assembly (44) drives the plurality of clamping members (43) to perform side clamping and positioning on the valve, the slow bracket (2) drives the valve to descend synchronously with the lifting platform (42); When the lifting platform (42) is lowered to the lowest position, it is separated from the slow bracket (2), the slow bracket (2) is overlapped on the lower sealing plate (11), and the upper end surfaces of the slow bracket (2) and the lower sealing plate (11) are flush, and the valve is compressed and sealed between the upper sealing plate (3) and the lower sealing plate (11).

2. The high-precision marine valve air tightness automatic detection device according to claim 1 is characterized by: The upper end surface of the lower sealing plate (11) is provided with a plurality of avoidance grooves (111) distributed around the circumference, and each avoidance groove (111) is provided with a vertical guide groove (112); the slow bracket (2) comprises a base ring (21) located between the lower sealing plate (11) and the lifting platform (42); the upper end surface of the base ring (21) is fixed with a plurality of sliders (22) slidably mounted in the plurality of guide grooves (112) in a one-to-one correspondence; a support block (23) for supporting one end of the valve is horizontally fixed to the top of each slider (22); the avoidance groove (111) is arranged in cooperation with the support block (23) in a relative position; when the support block (23) is overlapped in the avoidance groove (111), the upper end surface of the support block (23) is flush with the upper end surface of the lower sealing plate (11).

3. The high-precision marine valve air tightness automatic detection device according to claim 1 is characterized by: The sealing contact end surfaces between the lower sealing disc (11) and the upper sealing disc (3) and the valve are both provided with sealing grooves which are matched and embedded with the sealing layer in the valve.

4. The high-precision marine valve air tightness automatic detection device according to claim 2 is characterized by: The support platform (1) further comprises a column (12) fixed to the bottom end of the lower sealing plate (11); the column (12) vertically passes through the base ring (21) and the lifting platform (42), and the lifting platform (42) is vertically slidably mounted on the column (12).

5. A marine high-precision valve air tightness automatic detection device according to claim 1 or 4, characterized in that: The clamping member (43) comprises a slide plate (431) mounted horizontally and slidably on the bottom end surface of the lifting platform (42); a clamping block seat (432) is fixed on the slide plate (431); a side clamping block (433) for laterally clamping the valve is fixed on the clamping block seat (432); a pressing block (434) for downwardly pressing and contacting the upper end surface of the upper sealing plate (3) is fixed on the top end of the side clamping block (433).

6. The high-precision automatic air tightness detection device for marine valves according to claim 5 is characterized by: The driving assembly (44) comprises an articulated seat (442) which is driven to lift and slideably mounted on the column (12); a plurality of connecting rods (443) corresponding one to a plurality of clamping members (43) are articulated on the articulated seat (442); the other end of the connecting rod (443) is articulated on a slide plate (431) at a corresponding position.

7. The high-precision automatic air tightness detection device for marine valves according to claim 5 is characterized by: The side clamping block (433) is cylindrical, and a screw rod (4331) threadedly connected to the clamping block seat (432) is fixed to the bottom end of the side clamping block (433).

8. The high-precision automatic air tightness detection device for marine valves according to claim 1 is characterized by: The end surfaces of the lower sealing disc (11) and the upper sealing disc (3) that are in sealing contact with the valve are both provided with a protrusion that protrudes relative to the end surface and can extend inwardly to press against the side wall of the inner cavity of the valve port.

9. The high-precision automatic air tightness detection device for marine valves according to claim 1 is characterized by: The end surface of the upper sealing disc (3) that is in sealing contact with the valve is provided with a positioning portion that cooperates with the valve for positioning.

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