Detection device and detection method for low-temperature stop valve

Abstract

The invention relates to the technical field of stop valve detection, and discloses a low-temperature stop valve detection device and method, and the device comprises a detection box, and a to-be-detected valve is disposed in the detection box. According to the detection device and the detection method for the low-temperature stop valve, after the valve to be detected is put into the detection box, the screw rod penetrating through the disc handle is driven to rotate, so that the valve rod is driven to rotate, and the detection purpose of repeatedly opening and closing the valve element is achieved; the rotating angle of opening and closing of the disc handle can be recorded on the rotating disc, the second moving gear can be driven to rotate within a certain angle range by adjusting the angle of the nut on the arc-shaped block, and therefore the disc handle is driven to repeatedly rotate within a certain angle range, and the detection purpose that the valve rod drives the valve element to be repeatedly opened and closed is achieved. According to angle adjustment, the to-be-detected valves with the sizes within a certain range can be normally detected, and the device is high in adaptability and more flexible to use.

Description

Technical Field

[0001] The invention relates to the technical field of stop valve detection, and in particular to a detection device and a detection method for a low-temperature stop valve. Background Art

[0002] Cryogenic stop valve is a special type of valve, mainly used in cryogenic fluid environment and working under low temperature conditions. It is designed to close or regulate the flow of cryogenic fluids (such as liquefied natural gas, liquefied petroleum gas, etc.). Cryogenic stop valves are widely used in various industrial occasions that need to handle cryogenic fluids, such as chemical, petroleum, metallurgy, pharmaceutical and other industries, especially suitable for temperatures ranging from -196℃ to 700℃. They are also commonly used in gas liquefaction equipment, air separation equipment, natural gas liquefaction storage and transportation equipment, and liquid oxygen, nitrogen, argon, hydrogen, carbon dioxide cryogenic storage tanks and tank trucks.

[0003] In the cryogenic fluid processing system, the cryogenic stop valve is a key control component, and its performance stability and reliability are crucial to the safe operation of the entire system. However, since the cryogenic stop valve needs to work in an extremely low temperature environment, its material, structure and sealing performance are facing severe challenges. Therefore, it is particularly important to conduct comprehensive and accurate testing of the cryogenic stop valve.

[0004] The prior art publication number is CN105115672A, which provides a detection device and a detection method for a low-temperature stop valve. The detection device includes a fixed base plate, a first side plate, a second side plate and a guide rod mounted on the fixed base plate, a screw connecting seat with a hollow channel mounted on the first side plate, a screw seat with a hollow channel mounted on the guide rod, and an adjustment mechanism mounted on the second side plate for adjusting the detection space between the screw connecting seat and the screw seat; one end of the screw connecting seat is used to be connected to a connecting hose as a detection source, and the other end is used to be threadedly connected to the pipe end of the stop valve to be detected; one end of the screw seat is an inlet end, which is used to be threadedly connected to the internal threaded end of the stop valve to be detected, and the other end of the screw seat is connected to one end of the adjustment mechanism, and the outlet end of the screw seat is arranged on the side wall of the screw seat for installing a plug, which solves the problem that the low-temperature stop valve is inconvenient to seal due to the external pipe and the connection test delivery pipeline during the detection test.

[0005] Although the above-mentioned prior art makes it convenient to connect the external pipe and the delivery pipe during detection, it is impossible to detect the valve stem. In the existing low-temperature stop valve detection, not only the sealing and low-temperature fluid flow rate are to be detected, but also whether the low-temperature stop valve can be closed and opened normally in a low-temperature environment is one of the items to be tested. Among them, whether the valve body can be opened and closed normally and whether the valve stem can rotate normally are the key. Therefore, the valve stem needs to be rotated repeatedly in a low-temperature environment to detect whether it will be deformed in a low-temperature environment. In the prior art, repeated rotation of the valve stem is generally manual operation. Because the valve body size is different, the rotation amplitude will be different. The detection process is inefficient, and the valve stem is prone to ice and cannot be rotated during the detection process. Therefore, the detection process cannot flexibly detect the valve stem.

[0006] It can be seen that a detection device and a detection method for a low-temperature stop valve are needed to solve the problem mentioned in the above background technology that the valve stem strength cannot be flexibly detected and the problem of how to detect the valve stem freezing in a low-temperature environment cannot be flexibly solved. Summary of the invention

[0007] The object of the present invention is to provide a detection device and a detection method for a low-temperature stop valve, so as to solve the problem in the above background technology that the valve stem strength cannot be flexibly detected and the problem of how to detect the valve stem when it is frozen in a low-temperature environment cannot be flexibly solved.

[0008] In order to solve the above technical problems, the present invention provides the following technical solutions: a detection device for a low-temperature stop valve, comprising a detection box, wherein a valve to be tested is placed inside the detection box, and a disc handle at the top of the valve to be tested is penetrated by multiple groups of screw rods extending vertically downward, a rotating assembly for driving the disc handle to rotate is installed at the top of the screw rod, and an adjusting assembly for controlling the rotation amplitude of the disc handle is arranged on one side of the rotating assembly, a descending and unfolding hot melt assembly is arranged on one side of the screw rod, and the steam sprayed from the hot melt assembly contacts the valve stem of the valve to be tested; The rotating assembly includes a rotating disk, and the bottom end of the rotating disk is connected to a moving card wheel through a connecting rod, the bottom end of the moving card wheel is connected to a first moving gear, and the outer side of the moving card wheel is clamped in the inside of the clamping wheel through a clamping structure, the moving card wheel and the first moving gear can move up and down in the clamping wheel, the outer side of the connecting rod is connected to a second moving gear through a connecting plate, and the second moving gear and the first moving gear do not mesh with an intermediate gear at the same time; A connecting shaft passing through the mounting frame is provided below the intermediate gear, and a hinge block is hinged on the outer side of the connecting shaft through a rotating block. The threaded rod at the top of the hinge block passes through an arc block located on one side of the connecting shaft, and the threaded rod is adjusted in position in the arc block by rotating a nut on its outer side, and a driving motor is installed on the rear side of the arc block.

[0009] Preferably, the rotating disk is located outside the top of the detection box, and a scale is provided on the rotating disk, a triangle mark is provided on the top of the detection box, the connecting rod passes through the detection box and extends into the interior thereof, and the connecting rod moves up and down inside the detection box.

[0010] Preferably, the outer side of the connecting rod is connected to a limiting piece, and a positioning ball matching the limiting piece is arranged inside the valve to be tested. A connecting shaft is arranged at the top of the second movable gear, and the connecting shaft rotates under the connecting plate through a bearing. The outer side of the connecting shaft is connected to a limiting piece, and a positioning ball matching the limiting piece is arranged inside the valve to be tested.

[0011] Preferably, a plurality of groups of protrusions are equidistantly arranged on the inner wall of the snap-in wheel, and the movable snap-in wheel is located on the inner side of the plurality of groups of protrusions. A first spring is connected to the interior of the movable snap-in wheel, and a ball is connected to one end of the first spring. The number of the balls is multiple groups, and the plurality of groups of balls are located between the protrusions.

[0012] Preferably, a sleeve is provided below the second movable gear and above the connecting shaft, and the sleeve is located above the mounting frame, the rotating block is fixedly installed on the outside of the connecting shaft, a limiting groove is provided inside the arc block, and a scale is provided on the outside of the arc block, the threaded rod passes through the limiting groove and extends to the outside thereof, and a nut is threadedly connected to the outside of the threaded rod, and the nut is located on the outside of the limiting groove.

[0013] Preferably, the mounting bracket passes through the detection box and extends to the outside thereof, the output shaft of the drive motor passes through the mounting bracket and extends to the inside thereof, and the drive motor is located outside the detection box.

[0014] Preferably, the hot melt assembly includes a lifting motor, and the output end of the lifting motor is connected to a pulley group, the pulley group is located at the top of the intermediate gear, and the bottom end of the pulley group is connected to a screw rod, the outer side of the screw rod is connected to a lifting block, a fixed upper rod is provided on one side of the screw rod, and the bottom end of the fixed upper rod is connected to a fixed lower rod, and a flip groove is opened in the fixed lower rod.

[0015] Preferably, an outer sleeve rod is sleeved on the outer side of the fixed lower rod, and a bearing is provided on the outer side of the outer sleeve rod, the bearing is connected to the lifting block, a positioning block is connected below the bearing, and the positioning block passes through the outer sleeve rod and extends to the inside of the flip groove, and the positioning block moves inside the flip groove.

[0016] Preferably, the bottom end of the positioning block is connected to a second spring, one side of the bottom end of the fixed lower rod is connected to a mounting block, and one end of the second spring is located on the mounting block, a steam spray plate is installed under the outer casing rod, and a plurality of groups of steam nozzles are arranged on the steam spray plate, the plurality of groups of steam nozzles are connected to a group of steam pipes in common, and a steam generating device is installed at one end of the steam pipe.

[0017] A detection method using a detection device for a low-temperature stop valve comprises the following steps: Step 1: Place the valve to be tested into the test box so that the screw rod and the fixed upper rod pass through the disc handle. After placement, you can test it inside the test box. Let the cryogenic fluid enter from one end of the valve to be tested and exit from the other end. Observe the input and output pressure and flow data of the cryogenic fluid through the equipment installed at the input and output ports: Step 2: Then the valve stem can be tested. When the low-temperature fluid passes through the valve to be tested, the valve stem may be frozen, which makes it impossible to rotate the valve stem. Therefore, the lifting motor can be started first, so that the lifting motor drives the screw rod to rotate through the pulley group. During the rotation of the screw rod, the lifting block will be driven down. The lifting block drives the outer rod to descend through the bearing, so that the outer rod descends on the outside of the fixed lower rod. During the descent of the outer rod, the positioning block will move along the setting of the flip groove. When the positioning block moves down and approaches the end of the flip groove, it will rotate along the flip part of the flip groove, thereby driving the outer rod to rotate as a whole, causing the steam spray plate to rotate, and unfolding the steam spray plate that was originally in the storage state. The steam nozzle of the unfolded steam spray plate can heat-melt the outside of the valve stem to melt the frozen part of the outside of the valve stem, so that the valve stem can rotate normally. Step 3: When rotating the valve stem, first rotate the rotating disk. The rotating disk drives the first moving gear to rotate through the connecting rod. At this time, the first moving gear is meshed with the intermediate gear, so the intermediate gear will also rotate. The intermediate gear drives the screw rod and the fixed upper rod that penetrate the disc handle below to rotate. The disc handle is driven to rotate by the rod to open the valve to be tested. The rotation angle is known by the scale on the outside of the rotating disk and the triangle mark on the top of the detection box. After the rotating disk is rotated so that the valve stem drives the valve core to be completely opened or closed, the rotating disk is lifted upward. The rotating disk drives the moving clamping wheel and the first moving gear to move upward through the connecting rod, so that the first moving gear enters the inside of the clamping wheel and cannot mesh with the intermediate gear. The limit ball set inside the limit piece and the detection box will position the lifted connecting rod; Step 4: When the connecting rod is lifted, the second moving gear is also lifted up through the connecting plate, so that the second moving gear is located on one side of the intermediate gear and remains in meshing with it. The position of the threaded rod inside the arc block is adjusted according to the rotation angle recorded on the rotating disk. After loosening the nut, the position of the threaded rod is adjusted according to the scale on the arc block, so that it rotates to a certain extent with the hinge point on the rotating block as the origin. After one end of the threaded rod is rotated to the corresponding scale on the arc block, the nut can be tightened in the opposite direction to position it at the corresponding scale position of the arc block, and then the drive motor can be started. After the drive motor is started, it will drive the arc block to rotate, thereby driving the rotating block to rotate through the threaded rod and the hinge block, and the rotating block drives the connecting shaft to reciprocate within a certain range, so that the connecting shaft drives the second moving gear to reciprocate within a certain range, thereby driving the intermediate gear meshing with it to reciprocate, and detecting whether the valve stem can normally and repeatedly drive the valve core to open and close in a low temperature environment.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are: First, the present invention realizes that after the valve to be tested is placed in the test box, the lead screw penetrating the disc handle is driven to rotate, thereby driving the valve stem to rotate, so as to achieve the purpose of repeatedly opening and closing the valve core. In this process, the valve bodies tested are of different sizes, and the rotation angle of the disc handle to open and close will be recorded on the rotating disk. By adjusting the angle of the nut on the arc block, the second moving gear can be driven to rotate within a certain angle range, thereby driving the disc handle to repeatedly rotate within a certain angle range, meeting the purpose of repeatedly opening and closing the valve core driven by the valve stem. According to the angle adjustment, valves to be tested within a certain range of size can be normally tested, and the device has high adaptability and is more flexible to use.

[0019] Second, the present invention realizes that if the valve stem is frozen during the low-temperature fluid experiment by setting up a hot melt component, the frozen part of the valve stem can be melted by the unfolded steam spray plate. The steam spray plate is initially stored and can smoothly enter the inside of the disc handle. It descends and opens with the rotation of the screw rod, thereby expanding the area of ​​the steam spray, so that the valve stem can better melt the ice, so that the valve stem can be tested normally, avoiding the situation where the valve stem cannot rotate due to freezing at low temperature. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention; Figure 2 It is a cross-sectional view of the present invention; Figure 3 It is a schematic diagram of the connection structure of the rotating assembly, the adjusting assembly, the hot melt assembly and the valve to be tested of the present invention; Figure 4 It is a schematic diagram of the connection structure of the rotating assembly, the adjusting assembly and the hot melting assembly of the present invention; Figure 5 This is a schematic diagram of the split structure of the rotating assembly of the present invention; Figure 6 This is a schematic diagram of the split structure of the regulating component of the present invention; Figure 7 This is a schematic diagram of the connection structure of the hot melt assembly of the present invention; Figure 8 This is a schematic diagram of the split structure of the hot melt assembly of the present invention; Fig. 9 It is a schematic diagram of the unfolded structure of the steam spray plate of the present invention.

[0021] Among them: 1. Test box; 2. Valve to be tested; 201. Disc handle; 3. Rotating assembly; 301. Rotating disc; 302. Connecting rod; 303. Stopper; 304. Snap-on wheel; 3041. Bump; 305. Moving snap-on wheel; 3051. First spring; 3052. Ball; 306. First moving gear; 307. Intermediate gear; 308. Second moving gear; 309. Sleeve; 310. Connecting shaft; 4. Adjusting assembly; 401. Mounting frame; 402 , driving motor; 403, arc block; 4031, limiting groove; 404, threaded rod; 405, nut; 406, hinge block; 407, rotating block; 5, hot melt assembly; 501, lifting motor; 502, pulley set; 503, screw rod; 504, lifting block; 505, fixed upper rod; 506, fixed lower rod; 5061, turning groove; 507, outer sleeve rod; 5071, bearing; 508, positioning block; 5081, second spring; 509, steam spray plate. DETAILED DESCRIPTION

[0022] 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.

[0023] See also Figure 1 , 2 , 3, 4, 5, and Figure 6A detection device and a detection method for a low-temperature stop valve include a detection box 1, a valve 2 to be detected is placed inside the detection box 1, and a disc handle 201 at the top of the valve 2 to be detected is penetrated by multiple groups of screw rods 503 extending vertically downward, a rotating component 3 for driving the disc handle 201 to rotate is installed at the top of the screw rod 503, and an adjusting component 4 for controlling the rotation amplitude of the disc handle 201 is arranged on one side of the rotating component 3, the rotating component 3 includes a rotating disk 301, and the bottom end of the rotating disk 301 is connected to a moving card wheel 305 through a connecting rod 302, the bottom end of the moving card wheel 305 is connected to a first moving gear 306, and the outer side of the moving card wheel 305 is clamped in the inside of the clamping wheel 304 through a clamping structure, and the moving card wheel 301 is connected to the inner side of the clamping wheel 304 through a clamping structure. 05 and the first moving gear 306 can move up and down in the clamping wheel 304, the second moving gear 308 is connected to the outer side of the connecting rod 302 through a connecting plate, and the second moving gear 308 and the first moving gear 306 are not engaged with the intermediate gear 307 at the same time, a connecting shaft 310 is arranged below the intermediate gear 307 and passes through the mounting frame 401, and the outer side of the connecting shaft 310 is hinged with a hinge block 406 through a rotating block 407, the threaded rod 404 at the top of the hinge block 406 passes through the arc block 403 located on one side of the connecting shaft 310, and the threaded rod 404 is adjusted in position in the arc block 403 by rotating the nut 405 on its outer side, and a driving motor 402 is installed on the rear side of the arc block 403.

[0024] In the present embodiment, the valve 2 to be tested is a common low-temperature stop valve with a wheel disc at the top. When the valve core is closed and opened, the wheel disc is rotated, and the wheel disc drives the valve stem to rotate. The valve stem is generally a threaded rod structure. As it rotates, it rises or falls, causing the valve core driven by its bottom to rise or fall. When the valve core contacts the valve seat inside the stop valve, the cavity of the intermediate fluid is completely closed. On the contrary, when the valve core rises and maintains the maximum distance from the valve seat, the cavity is completely opened. In the present embodiment, there is not only the valve 2 to be tested but also the input pipe and output pipe installed on both sides of the valve 2 to be tested. A detection device is also installed at the connection between the input pipe and the output pipe and the valve 2 to be tested, which can be a flow detection device. Observe the sealing performance of the stop valve, and install pressure detection equipment. Pump bodies are installed at the ends of the input pipe and the output pipe to transport the cryogenic fluid. Because the temperature of the cryogenic fluid is very low, an insulation structure can be set inside the detection box 1. In addition, because the temperature of the cryogenic fluid is low, the valve stem is likely to freeze. If the connection between the valve stem and the valve body is frozen, the valve stem cannot be easily rotated for detection. The disc handle 201 is a common wheel structure. The interior of the ring is usually divided into three petals by a partition, and it can also be multiple petals. After the screw rod 503 is extended into the gap, it revolves, and the edge contacts the internal partition of the disc handle 201, thereby pushing the disc handle 201 to rotate. Therefore, this device is suitable for detecting stop valves with a wheel structure.

[0025] Specifically, the rotating disk 301 is located outside the top of the detection box 1, and a scale is set on the rotating disk 301. A triangle mark is set on the top of the detection box 1. The connecting rod 302 penetrates the detection box 1 and extends into the inside thereof, and the connecting rod 302 moves up and down inside the detection box 1.

[0026] In this embodiment, the first time the disc handle 201 is driven to rotate, the rotating disk 301 is rotated manually, because it is necessary to know how many turns or degrees the disc handle 201 must be rotated to completely open or completely close the valve core. The first rotation is driven manually, and the degree of rotation is known through the scale and triangle mark on the rotating disk 301, thereby facilitating the adjustment of the angle of the threaded rod 404 on the arc block 403 according to a certain ratio.

[0027] Specifically, the outer side of the connecting rod 302 is connected to the limit piece 303, and the interior of the valve to be tested 2 is provided with a positioning ball matching the limit piece 303. A connecting shaft is provided at the top of the second movable gear 308, and the connecting shaft rotates under the connecting plate through a bearing. The outer side of the connecting shaft is connected to the limit piece 303, and the interior of the valve to be tested 2 is provided with a positioning ball matching it.

[0028] In this embodiment, after the first rotation to know the degree of rotation, the rotating disk 301 can be lifted up, together with the connecting rod 302, the limit member 303, the moving card wheel 305 and the first moving gear 306. After the staff lets go, the positioning ball on the outside of the limit member 303 will limit it so that it remains in the lifted state. The specific structure of the limit member 303 can be that multiple groups of balls are arranged on the outside of the metal ring, and the balls are made of rubber. When it is lifted up, two adjacent groups of rubber balls are locked with the positioning balls arranged inside the detection box 1, so as to position it. Because the positioning structure is a ball, it does not affect the rotation of the second moving gear 308.

[0029] Specifically, a plurality of groups of protrusions 3041 are equidistantly arranged on the inner wall of the snap-in wheel 304, and the movable snap-in wheel 305 is located on the inner side of the plurality of groups of protrusions 3041. The interior of the movable snap-in wheel 305 is connected to a first spring 3051, and one end of the first spring 3051 is connected to a ball 3052. There are multiple groups of balls 3052, and the multiple groups of balls 3052 are located between the protrusions 3041.

[0030] In this embodiment, two sets of baffles can be provided inside the detection box 1 above the moving card wheel 305. The function of the baffle is to block the lifted ball 3052 to prevent the ball 3052 from expanding a long distance under the action of the first spring 3051, and from being inconvenient when being pressed down to enter the inside of the card wheel 304. The baffle can make the ball 3052 smoothly enter the protrusion 3041 during the lifting and pressing process. When the rotating disk 301 is not lifted, the first moving gear 306 is meshed with the middle gear 307. After the first moving gear 306 is lifted, the first moving gear 306 is not meshed with the middle gear 307, and the middle gear 307 is meshed with the second moving gear 308. Therefore, at this time, it is not the rotating disk 301 that drives the middle gear 307 to rotate, but the drive motor 402.

[0031] Specifically, a sleeve 309 is arranged below the second movable gear 308 and above the connecting shaft 310, and the sleeve 309 is located above the mounting frame 401, the rotating block 407 is fixedly installed on the outside of the connecting shaft 310, a limiting groove 4031 is arranged inside the arc block 403, and a scale is arranged on the outside of the arc block 403, the threaded rod 404 passes through the limiting groove 4031 and extends to the outside thereof, and the outer side of the threaded rod 404 is connected to the nut 405 through a thread, and the nut 405 is located on the outside of the limiting groove 4031.

[0032] In this embodiment, when the rotating disk 301 is lifted, the second movable gear 308 is also lifted together. The second movable gear 308 is positioned after lifting by means of a connecting shaft provided at the top and a limiting member 303 on its outer side. The sleeve 309 includes an upper sleeve and a lower sleeve. When lifted, the upper sleeve in the sleeve 309 is lifted out of the lower sleeve. This process does not affect the transmission of the rotation process.

[0033] Specifically, the mounting frame 401 passes through the detection box 1 and extends to the outside thereof, the output shaft of the driving motor 402 passes through the mounting frame 401 and extends to the inside thereof, and the driving motor 402 is located outside the detection box 1 .

[0034] In this embodiment, the arc block 403 located on the outside of the detection box 1 is convenient for adjustment operation. When the arc block 403 is driven by the driving motor 402 to rotate, the hinge block 406 will rotate with the hinge point of the rotating block 407 as the center point, thereby driving the connecting shaft 310 to reciprocate a certain amplitude. The rotation of the connecting shaft 310 drives the rotation of the second moving gear 308, thereby driving the intermediate gear 307 meshing therewith to rotate back and forth. The rotation amplitude of the connecting shaft 310 is related to the position of the threaded rod 404 on the arc block 403. The closer the threaded rod 404 is to the output end of the driving motor 402, the smaller the rotation amplitude of the connecting shaft 310 is, and the farther the threaded rod 404 is from the output end of the driving motor 402, the larger the rotation amplitude of the connecting shaft 310 is. The arc size of the arc block 403, the second moving gear 308, and the gear size of the intermediate gear 307 are all determined according to the needs of use. The gear size and the arc size of the arc block 403 in the attached figure do not limit the actual proportion.

[0035] See also Figure 7 , 8 and Fig. 9 A detection device and a detection method for a low-temperature stop valve, a downwardly deployed hot melt component 5 is provided on one side of a screw rod 503, and the steam ejected from the hot melt component 5 contacts the valve stem of the valve 2 to be tested.

[0036] In this embodiment, the lifting motor 501 is installed above the intermediate gear 307 and rotates with the rotation of the intermediate gear 307, so a mobile power supply can be installed on the intermediate gear 307 to provide power for the lifting motor 501. The pulley group 502 includes a pulley and a belt. The number of pulleys can be multiple groups. The screw rod 503 is driven to rotate by the pulley, so the number of screw rods 503 can also be multiple groups, and the corresponding number of steam spray plates 509 can also be multiple groups. When multiple groups of steam spray plates 509 are deployed at the same time, the valve stem will be surrounded more comprehensively and the ice melting effect will be better.

[0037] Specifically, the hot melt component 5 includes a lifting motor 501, and the output end of the lifting motor 501 is connected to a pulley group 502, the pulley group 502 is located at the top of the intermediate gear 307, and the bottom end of the pulley group 502 is connected to a screw rod 503, the outer side of the screw rod 503 is connected to a lifting block 504, a fixed upper rod 505 is provided on one side of the screw rod 503, and the bottom end of the fixed upper rod 505 is connected to a fixed lower rod 506, and a flip groove 5061 is opened in the fixed lower rod 506.

[0038] In this embodiment, the fixed upper rod 505 is installed below the intermediate gear 307, corresponding to the number of the screw rods 503. The fixed upper rod 505 and the fixed lower rod 506 are an integrated structure, but a flip groove 5061 is provided in the fixed lower rod 506. The setting trajectory of the flip groove 5061 roughly includes a vertical portion and a flip portion. The positioning block 508 initially moves in the vertical portion and then moves along the flip portion. The flip angle of the flip portion can be ninety degrees, so that the steam spray plate 509 is flipped ninety degrees. The steam spray plate 509 is initially set vertically, which does not affect entering the interior of the disc handle 201. After flipping ninety degrees, it is in the unfolded state. Because it has entered the interior of the disc handle 201 at this time, it does not matter even if it is unfolded. The unfolded steam spray plate 509 can increase the contact area between the steam sprayed from the steam nozzle and the valve stem. The relative arrangement of multiple groups of steam spray plates 509 can speed up the ice melting speed.

[0039] Specifically, the outer side of the fixed lower rod 506 is sleeved with an outer rod 507, and a bearing 5071 is provided on the outer side of the outer rod 507. The bearing 5071 is connected to the lifting block 504. A positioning block 508 is connected below the bearing 5071. The positioning block 508 passes through the outer rod 507 and extends to the inside of the flip groove 5061. The positioning block 508 moves inside the flip groove 5061.

[0040] In this embodiment, the lifting block 504 drives the outer rod 507 to descend through the bearing 5071. During this process, due to the existence of the bearing 5071, the outer rod 507 is able to move downward and rotate, and the second spring 5081 gradually retracts during the descent.

[0041] Specifically, the bottom end of the positioning block 508 is connected to a second spring 5081, one side of the bottom end of the fixed lower rod 506 is connected to a mounting block, and one end of the second spring 5081 is located on the mounting block, a steam spray plate 509 is installed below the outer sleeve rod 507, and a plurality of steam nozzles are arranged on the steam spray plate 509, and the plurality of steam nozzles are connected to a group of steam pipes, and a steam generating device is installed at one end of the steam pipe.

[0042] In this embodiment, the lower half of the outer sleeve rod 507 is not a complete hollow cylindrical sleeve structure. Since a mounting block is installed at the bottom end of the fixed lower rod 506, a groove is provided in the lower half of the outer sleeve rod 507 to meet the downward rotation action. After the steam generating device generates steam, the steam is sprayed out through the steam pipe and the steam nozzle and sprayed between the valve stem and the valve body, thereby achieving the effect of rapid ice melting and avoiding the situation where the valve stem cannot rotate. Since the steam pipe will rotate and swivel to a certain extent, a thicker pipe diameter can be used to prevent torsional occlusion.

[0043] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present application. The scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A detection device for a cryogenic stop valve, comprising a detection box (1), characterized in that: The valve to be tested (2) is placed inside the detection box (1), and the disc handle (201) at the top of the valve to be tested (2) is penetrated by a plurality of groups of screw rods (503) extending vertically downwards, a rotating component (3) for driving the disc handle (201) to rotate is installed at the top of the screw rod (503), and an adjusting component (4) for controlling the rotation amplitude of the disc handle (201) is arranged on one side of the rotating component (3), and a descending and unfolding hot melt component (5) is arranged on one side of the screw rod (503), and the steam ejected by the hot melt component (5) contacts the valve stem of the valve to be tested (2); The rotating assembly (3) comprises a rotating disk (301), and the bottom end of the rotating disk (301) is connected to a moving card wheel (305) via a connecting rod (302), the bottom end of the moving card wheel (305) is connected to a first moving gear (306), and the outer side of the moving card wheel (305) is clamped inside a clamping wheel (304) via a clamping structure, the moving card wheel (305) and the first moving gear (306) can move up and down in the clamping wheel (304), the outer side of the connecting rod (302) is connected to a second moving gear (308) via a connecting plate, and the second moving gear (308) and the first moving gear (306) are not meshed with an intermediate gear (307) at the same time; A connecting shaft (310) penetrating the mounting frame (401) is arranged below the intermediate gear (307), and a hinge block (406) is hingedly connected to the outer side of the connecting shaft (310) via a rotating block (407), a threaded rod (404) at the top end of the hinge block (406) penetrates an arc block (403) located on one side of the connecting shaft (310), and the threaded rod (404) is adjusted in position in the arc block (403) by rotating a nut (405) on the outer side thereof, and a driving motor (402) is installed on the rear side of the arc block (403).

2. A detection device for a cryogenic stop valve according to claim 1, characterized in that: The rotating disk (301) is located outside the top of the detection box (1), and a scale is provided on the rotating disk (301). A triangle mark is provided at the top of the detection box (1). The connecting rod (302) penetrates the detection box (1) and extends into the interior thereof, and the connecting rod (302) moves up and down inside the detection box (1).

3. A detection device for a cryogenic stop valve according to claim 2, characterized in that: The outer side of the connecting rod (302) is connected to a limiting member (303), and a positioning ball matching the limiting member (303) is arranged inside the valve to be tested (2). A connecting shaft is arranged at the top end of the second movable gear (308), and the connecting shaft rotates under the connecting plate through a bearing, and the outer side of the connecting shaft is connected to the limiting member (303), and a positioning ball matching the limiting member (303) is arranged inside the valve to be tested (2).

4. A detection device for a cryogenic stop valve according to claim 3, characterized in that: The inner wall of the clamping wheel (304) is equidistantly provided with a plurality of groups of protrusions (3041), and the movable clamping wheel (305) is located inside the plurality of groups of protrusions (3041). The interior of the movable clamping wheel (305) is connected to a first spring (3051), and one end of the first spring (3051) is connected to a ball (3052). The number of the ball (3052) is a plurality of groups, and the plurality of groups of the ball (3052) are located between the protrusions (3041).

5. A detection device for a cryogenic stop valve according to claim 4, characterized in that: A sleeve (309) is provided below the second moving gear (308) and above the connecting shaft (310), and the sleeve (309) is located above the mounting frame (401); the rotating block (407) is fixedly mounted on the outside of the connecting shaft (310); a limiting groove (4031) is provided inside the arc block (403), and a scale is provided on the outside of the arc block (403); the threaded rod (404) passes through the limiting groove (4031) and extends to the outside thereof; the outside of the threaded rod (404) is threadedly connected to a nut (405), and the nut (405) is located on the outside of the limiting groove (4031).

6. A detection device for a cryogenic stop valve according to claim 5, characterized in that: The mounting frame (401) passes through the detection box (1) and extends to the outside thereof, the output shaft of the drive motor (402) passes through the mounting frame (401) and extends to the inside thereof, and the drive motor (402) is located outside the detection box (1).

7. A detection device for a cryogenic stop valve according to claim 6, characterized in that: The hot melt component (5) comprises a lifting motor (501), and the output end of the lifting motor (501) is connected to a pulley group (502), the pulley group (502) is located at the top of the intermediate gear (307), and the bottom end of the pulley group (502) is connected to a screw rod (503), the outer side of the screw rod (503) is connected to a lifting block (504), a fixed upper rod (505) is provided on one side of the screw rod (503), and the bottom end of the fixed upper rod (505) is connected to a fixed lower rod (506), and a flip groove (5061) is provided in the fixed lower rod (506).

8. A detection device for a cryogenic shut-off valve according to claim 7, characterized in that: An outer sleeve rod (507) is sleeved on the outer side of the fixed lower rod (506), and a bearing (5071) is arranged on the outer side of the outer sleeve rod (507). The bearing (5071) is connected to the lifting block (504). A positioning block (508) is connected below the bearing (5071). The positioning block (508) passes through the outer sleeve rod (507) and extends to the inside of the flip groove (5061). The positioning block (508) moves inside the flip groove (5061).

9. A detection device for a cryogenic stop valve according to claim 8, characterized in that: The bottom end of the positioning block (508) is connected to a second spring (5081), one side of the bottom end of the fixed lower rod (506) is connected to a mounting block, and one end of the second spring (5081) is located on the mounting block, a steam spray plate (509) is installed below the outer sleeve rod (507), and a plurality of groups of steam nozzles are arranged on the steam spray plate (509), the plurality of groups of steam nozzles are connected to a group of steam pipes, and a steam generating device is installed at one end of the steam pipes.

10. A detection method using the detection device for a cryogenic shut-off valve according to claim 9, characterized in that: The following steps are involved: Step 1: Place the valve to be tested (2) into the testing box (1) so that the screw rod (503) and the fixed upper rod (505) pass through the disc handle (201). After placement, the testing can be carried out inside the testing box (1). Let the cryogenic fluid enter from one end of the valve to be tested (2) and exit from the other end. The input and output pressure and flow data of the cryogenic fluid are observed through the equipment installed at the input and output ports: Step 2: Then the valve stem can be tested. When the low-temperature fluid passes through the valve to be tested (2), the valve stem may freeze, which makes it impossible to rotate the valve stem. Therefore, the lifting motor (501) can be started first, so that the lifting motor (501) drives the screw rod (503) to rotate through the pulley group (502). During the rotation of the screw rod (503), the lifting block (504) is driven to descend. The lifting block (504) drives the outer sleeve rod (507) to descend through the bearing (5071), so that the outer sleeve rod (507) descends on the outside of the fixed lower rod (506). During the process of the sleeve rod (507) descending, the positioning block (508) moves along the setting of the flip groove (5061). When the positioning block (508) moves down and approaches the end of the flip groove (5061), it rotates along the flip part of the flip groove (5061), thereby driving the outer sleeve rod (507) to rotate as a whole, causing the steam spray plate (509) to rotate, and unfolding the steam spray plate (509) that was originally in a stored state. The steam spray head in the unfolded steam spray plate (509) can heat-melt the outer side of the valve stem, melt the frozen part of the outer side of the valve stem, and allow the valve stem to rotate normally. Step 3: When rotating the valve stem, the rotating disk (301) is first rotated. The rotating disk (301) drives the first moving gear (306) to rotate through the connecting rod (302). At this time, the first moving gear (306) is meshed with the intermediate gear (307), so the intermediate gear (307) also rotates. The intermediate gear (307) drives the screw rod (503) and the fixed upper rod (505) that penetrate the disc handle (201) below to rotate. The disc handle (201) is driven to rotate by the rod, thereby opening the valve (2) to be tested. The outer scale of the rotating disk (301) and the The angle of rotation is known from the triangle mark at the top of the detection box (1). After the rotating disk (301) is rotated so that the valve stem drives the valve core to be completely opened or closed, the rotating disk (301) is lifted upwards. The rotating disk (301) drives the movable clamping wheel (305) and the first movable gear (306) to move upwards through the connecting rod (302), so that the first movable gear (306) enters the interior of the clamping wheel (304) and cannot mesh with the intermediate gear (307). The limiting member (303) and the limiting ball disposed inside the detection box (1) will position the lifted connecting rod (302); Step 4: When the connecting rod (302) is lifted, the second moving gear (308) is lifted together through the connecting plate, so that the second moving gear (308) is located on one side of the intermediate gear (307) and remains in meshing with it. The position of the threaded rod (404) inside the arc block (403) is adjusted according to the rotation angle recorded on the rotating disk (301). After loosening the nut (405), the position of the threaded rod (404) is adjusted according to the scale on the arc block (403) so that it rotates to a certain extent with the hinge point on the rotating block (407) as the origin. After one end of the threaded rod (404) is rotated to the corresponding scale on the arc block (403), the threaded rod (404) can be reversed. The nut (405) is tightened to position the arc block (403) at the corresponding scale position, and then the drive motor (402) can be started. After the drive motor (402) is started, the arc block (403) is driven to rotate, thereby driving the rotating block (407) to rotate through the threaded rod (404) and the hinge block (406). The rotating block (407) drives the connecting shaft (310) to reciprocate within a certain range, so that the connecting shaft (310) drives the second moving gear (308) to reciprocate within a certain range, thereby driving the intermediate gear (307) meshing therewith to reciprocate, and detecting whether the valve stem can normally and repeatedly drive the valve core to open and close in a low temperature environment.

Images