A detection device and detection method for a low-temperature stop valve

Abstract

The present invention relates to the technical field of globe valve detection, and discloses a detection device and a detection method for a cryogenic globe valve, including a detection box, in which a valve to be tested is placed. The detection device and detection method for the cryogenic globe valve achieve the detection purpose of repeatedly opening and closing the valve core by driving the rotation of the lead screw passing through the disc handle after placing the valve to be tested in the detection box, thereby driving the valve stem to rotate. During this process, since the sizes of the valve bodies to be detected are different, the rotation angles of the disc handle for opening and closing are recorded on the rotating disc. By adjusting the angle of the nut on the arc-shaped block, the second moving gear can be driven to rotate within a certain angle range, thereby driving the disc handle to rotate repeatedly within a certain angle range, meeting the detection purpose of driving the valve stem to drive the valve core to open and close repeatedly. According to the angle adjustment, the valves to be tested within a certain size range can be normally detected, and the device has high adaptability and is more flexible to use.

Description

Technical Field

[0001] The present invention relates to the technical field of globe valve detection, and particularly to a detection device and a detection method for a cryogenic globe valve. Background Technique

[0002] A cryogenic globe valve is a special type of valve mainly used in cryogenic fluid environments and operating under cryogenic conditions. It is designed to close or regulate the flow of cryogenic fluids (such as liquefied natural gas, liquefied petroleum gas, etc.). Cryogenic globe valves are widely used in various industrial applications that require handling cryogenic fluids, such as the chemical, petroleum, metallurgy, and pharmaceutical industries, especially suitable for the temperature range from -196°C to 700°C. They are also commonly used in gas liquefaction equipment, air separation equipment, natural gas liquefaction storage and transportation equipment, as well as cryogenic storage tanks and tank trucks for liquid oxygen, nitrogen, argon, hydrogen, and carbon dioxide.

[0003] In a cryogenic fluid processing system, as a key control element, the performance stability and reliability of a cryogenic globe valve are crucial for the safe operation of the entire system. However, since a cryogenic globe valve needs to operate in an extremely low-temperature environment, its materials, structure, and sealing performance all face severe challenges. Therefore, it is particularly important to conduct a comprehensive and accurate detection of cryogenic globe valves.

[0004] The prior art with the publication number CN105115672A provides a detection device and a detection method for a cryogenic globe valve. The detection device includes a fixed bottom plate, a first side plate, a second side plate, and guide rods installed on the fixed bottom plate, a screw connection seat with a hollow channel installed on the first side plate, a nut seat with a hollow channel installed on the guide rods, and an adjustment mechanism installed on the second side plate for adjusting the detection space between the screw connection seat and the nut seat. One end of the screw connection seat is used to connect with a connection hose as a detection source, and the other end is used to be threadedly connected to the connection end of the globe valve to be detected. One end of the nut seat is an inlet end for being threadedly connected to the internal thread end of the globe valve to be detected. The other end of the nut seat is connected to one end of the adjustment mechanism. The outlet end of the nut seat is arranged on the side wall of the nut seat for installing a plug, which solves the problem of inconvenient sealing of the external connection pipe and the connection test pipeline during the detection test of the cryogenic globe valve.

[0005] In the above-mentioned prior art, although it is convenient to connect the external pipe and the conveying pipe during detection, the valve stem cannot be detected. In the existing detection of cryogenic globe valves, not only the sealing performance and the flow rate of cryogenic fluid need to be detected, but also whether the cryogenic globe valve can be normally closed and opened in a cryogenic environment is one of the items to be tested. Among them, whether the valve body can be normally opened and closed and whether the valve stem can rotate normally are the key points. Therefore, the valve stem needs to be rotated repeatedly in a cryogenic environment to detect whether it will deform in the cryogenic environment. In the prior art, rotating the valve stem repeatedly is generally manual operation. Because the sizes of valve bodies are different, there will be differences in the rotation amplitude. The detection process has low efficiency, and the valve stem is prone to icing and cannot rotate during the detection process. Therefore, the valve stem cannot be detected flexibly in this detection process.

[0006] It can be seen that a detection device and a detection method for a cryogenic globe valve are needed to solve the problems mentioned in the above background technology, that is, the valve stem strength cannot be detected flexibly and how to flexibly solve the problem of how the valve stem is detected when it freezes in a cryogenic environment. Summary of the Invention

[0007] The purpose of the present invention is to provide a detection device and a detection method for a cryogenic globe valve to solve the problems mentioned in the above background technology, that is, the valve stem strength cannot be detected flexibly and how to flexibly solve the problem of how the valve stem is detected when it freezes in a cryogenic environment.

[0008] To solve the above technical problems, the present invention provides the following technical solutions: A detection device for a cryogenic globe valve includes a detection box. A valve to be tested is placed inside the detection box, and the disc handle at the top of the valve to be tested is penetrated by multiple groups of lead screws vertically downward. A rotating component for driving the disc handle to rotate is installed at the top of the lead screw, and an adjusting component for controlling the rotation amplitude of the disc handle is arranged on one side of the rotating component. A heat melting component that descends and unfolds is arranged on one side of the lead screw, and the steam ejected by the heat melting component contacts the valve stem of the valve to be tested;

[0009] The rotating component includes a rotating disc, and a moving caster is connected to the bottom end of the rotating disc through a connecting rod. A first moving gear is connected to the bottom end of the moving caster, and the outside of the moving caster is clamped inside a clamping wheel through a clamping structure. The moving caster and the first moving gear can move up and down in the clamping wheel. A second moving gear is connected to the outside of the connecting rod through a connecting plate, and the second moving gear and the first moving gear do not simultaneously mesh with an intermediate gear;

[0010] A connecting shaft penetrating the mounting frame is arranged below the second moving gear, and a hinge block is hinged to the outside of the connecting shaft through a rotating block. A threaded rod at the top of the hinge block penetrates an arc-shaped block located on one side of the connecting shaft, and the position of the threaded rod in the arc-shaped block is adjusted by rotating the nut on its outside. A driving motor is installed at the rear of the arc-shaped block.

[0011] Preferably, the rotating disk is located outside the top of the detection box, and a scale is provided on the rotating disk. A triangular mark is provided at the top of the detection box. The connecting rod penetrates through the detection box and extends into its interior, and the connecting rod moves up and down inside the detection box.

[0012] Preferably, a limiting member is connected to the outside of the connecting rod. Positioning balls matching the limiting member are provided inside the valve to be tested. A connecting shaft is provided at the top of the second moving gear, and the connecting shaft rotates under the connecting plate through a bearing. A limiting member is connected to the outside of the connecting shaft, and positioning balls matching it are provided inside the valve to be tested.

[0013] Preferably, a plurality of groups of protrusions are equidistantly arranged on the inner wall of the clamping wheel, and the movable clamping wheel is located inside the plurality of groups of protrusions. A first spring is connected inside the movable clamping wheel, and one end of the first spring is connected with a ball. The number of the balls is a plurality of groups, and the plurality of groups of balls are located between the protrusions.

[0014] Preferably, a sleeve is provided below the second moving 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-shaped block, and a scale is provided on the outside of the arc-shaped block. The threaded rod penetrates through the limiting groove and extends to its outside, and a nut is connected to the outside of the threaded rod through a thread. The nut is located outside the limiting groove.

[0015] Preferably, the mounting frame penetrates through the detection box and extends to its outside. The output shaft of the driving motor penetrates through the mounting frame and extends to its inside, and the driving motor is located outside the detection box.

[0016] Preferably, the heat fusion assembly includes a lifting motor, and a pulley group is connected to the output end of the lifting motor. The pulley group is located at the top of the intermediate gear, and a lead screw is connected to the bottom end of the pulley group. A lifting block is connected to the outside of the lead screw. A fixed upper rod is provided on one side of the lead screw, and a fixed lower rod is connected to the bottom end of the fixed upper rod. A flipping groove is provided in the fixed lower rod.

[0017] Preferably, an outer sleeve rod is sleeved on the outside of the fixed lower rod, and a bearing is provided on the outside 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 penetrates through the outer sleeve rod and extends into the flipping groove. The positioning block moves inside the flipping groove.

[0018] Preferably, a second spring is connected to the bottom end of the positioning block. A mounting block is connected to one side of the bottom end of the fixed lower rod, and one end of the second spring is located on the mounting block. A steam spraying plate is installed below the outer sleeve rod, and a plurality of steam spray nozzles are provided on the steam spraying plate. The plurality of steam spray nozzles are jointly connected to a steam pipe, and a steam generating device is installed at one end of the steam pipe.

[0019] A detection method for a detection device using a low-temperature stop valve, comprising the following steps:

[0020] Step 1: Place the valve to be tested inside the detection box, so that the lead screw and the fixed upper rod pass through the disc handle part. After placing, detection can be carried out inside the detection box. Let the low-temperature fluid be input from one end of the valve to be tested and output from the other end. Observe the input and output pressure and flow data of the low-temperature fluid through the devices installed at the input and output ports:

[0021] Step 2: Then, the valve stem can be detected. When the low-temperature fluid passes through the valve to be tested, it may cause the valve stem to freeze, making it impossible to rotate the valve stem at this time. Therefore, the lifting motor can be started first, so that the lifting motor drives the lead screw to rotate through the pulley group. During the rotation of the lead screw, the lifting block will be driven to descend. The lifting block drives the outer sleeve rod to descend through the bearing, so that the outer sleeve rod descends outside the fixed lower rod. During the descent of the outer sleeve rod, the positioning block will move along the setting of the flipping groove. When the positioning block moves down close to the end of the flipping groove, it will rotate along the flipping part of the flipping groove, thereby driving the overall rotation of the outer sleeve rod, making the steam spraying plate rotate, and unfolding the steam spraying plate in the original storage state. The steam nozzles on the unfolded steam spraying plate can thermally melt the outside of the valve stem, melting the ice on the outside of the valve stem, so that the valve stem can rotate normally;

[0022] Step 3: Before rotating the valve stem, rotate the rotating disc first. The rotating disc drives the first moving gear to rotate through the connecting rod. At this time, the first moving gear meshes with the intermediate gear, so the intermediate gear will also rotate. The intermediate gear drives the lead screw and the fixed upper rod passing through the disc handle below to rotate, and uses the rod to drive the disc handle to rotate, thereby opening the valve to be tested. The rotation angle can be known through the scale on the outside of the rotating disc and the triangular mark at the top of the detection box. After the valve stem drives the valve core to be completely opened or closed by rotating the rotating disc, lift the rotating disc upward. The rotating disc drives the moving caster and the first moving gear to move upward through the connecting rod, so that the first moving gear enters the inside of the catching wheel and cannot mesh with the intermediate gear. The limiting part and the limiting balls arranged inside the detection box will position the lifted connecting rod;

[0023] Step 4: While the connecting rod is lifted, the second moving gear is driven by the connecting plate to be lifted together, so that the second moving gear is located on one side of the intermediate gear and remains in a meshing state with it. The position of the threaded rod inside the arc-shaped 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-shaped 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 rotates to the corresponding scale on the arc-shaped block, the nut can be tightened in the reverse direction to position it at the corresponding scale position of the arc-shaped block. Then, the drive motor can be started. After the drive motor is started, it will drive the arc-shaped block to rotate, so as to drive the rotating block to rotate through the threaded rod and the hinge block. The rotating block drives the connecting shaft to rotate reciprocally within a certain range, so that the connecting shaft drives the second moving gear to rotate reciprocally within a certain range, thereby driving the meshing intermediate gear to rotate reciprocally, and detecting whether the valve stem can normally drive the valve core to open and close repeatedly in a low-temperature environment.

[0024] Compared with the prior art, the beneficial effects achieved by the present invention are as follows:

[0025] First, through the detection box, the valve to be tested, the rotating assembly, and the adjusting assembly provided in the present invention, after the valve to be tested is placed in the detection box, the valve stem is driven to rotate by driving the screw rod passing through the disk handle, so as to achieve the detection purpose of repeatedly opening and closing the valve core. During this process, since the sizes of the valve bodies to be detected are different, the rotation angles of the disk handle for opening and closing are recorded on the rotating disk. By adjusting the angle of the nut on the arc-shaped block, the second moving gear can be driven to rotate within a certain angle range, thereby driving the disk handle to rotate repeatedly within a certain angle range, meeting the detection purpose of the valve stem driving the valve core to open and close repeatedly. According to the angle adjustment, the valves to be tested within a certain size range can be normally detected, and the adaptability of the device is high, and it is more flexible to use.

[0026] Second, through the heat fusion assembly provided in the present invention, during the low-temperature fluid experiment, if the valve stem freezes, the frozen part of the valve stem can be melted by the unfolded steam spraying plate. The steam spraying plate is in a retracted state initially and can smoothly enter the inside of the disk handle. It descends and opens as the screw rod rotates, thereby expanding the steam spraying area, enabling the valve stem to better melt the ice, so that the valve stem can be normally detected, avoiding the situation where the valve stem cannot rotate due to freezing at low temperature. Description of the Drawings

[0027] Figure 1 is a schematic structural diagram of the present invention;

[0028] Figure 2 is a cross-sectional view of the present invention;

[0029] Figure 3Schematic diagram of the connection structure of the rotation component, adjustment component, heat fusion component and valve to be tested of the present invention;

[0030] Figure 4 Schematic diagram of the connection structure of the rotation component, adjustment component and heat fusion component of the present invention;

[0031] Figure 5 Schematic diagram of the split structure of the rotation component of the present invention;

[0032] Figure 6 Schematic diagram of the split structure of the adjustment component of the present invention;

[0033] Figure 7 Schematic diagram of the connection structure of the heat fusion component of the present invention;

[0034] Figure 8 Schematic diagram of the split structure of the heat fusion component of the present invention;

[0035] Figure 9 Schematic diagram of the unfolded structure of the steam spraying plate of the present invention.

[0036] Wherein: 1, detection box; 2, valve to be tested; 201, disc handle; 3, rotation component; 301, rotating disc; 302, connecting rod; 303, limiting member; 304, clamping wheel; 3041, convex block; 305, moving clamping wheel; 3051, first spring; 3052, ball; 306, first moving gear; 307, intermediate gear; 308, second moving gear; 309, sleeve; 310, connecting shaft; 4, adjustment component; 401, mounting bracket; 402, drive motor; 403, arc-shaped block; 4031, limiting groove; 404, threaded rod; 405, nut; 406, hinge block; 407, rotating block; 5, heat fusion component; 501, lifting motor; 502, pulley set; 503, lead screw; 504, lifting block; 505, fixed upper rod; 506, fixed lower rod; 5061, flipping groove; 507, outer sleeve rod; 5071, bearing; 508, positioning block; 5081, second spring; 509, steam spraying plate. Detailed implementation manners

[0037] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Please refer to Figure 1 、 2 、 3, 4, 5 and Figure 6, a detection device and detection method for a low-temperature globe valve, including a detection box 1. Inside the detection box 1, a valve to be tested 2 is placed. The disc handle 201 at the top of the valve to be tested 2 is penetrated by multiple sets of lead screws 503 vertically downward. At the top of the lead screw 503, a rotating component 3 for driving the disc handle 201 to rotate is installed. And on one side of the rotating component 3, an adjusting component 4 for controlling the rotation amplitude of the disc handle 201 is provided. The rotating component 3 includes a rotating disc 301. The bottom end of the rotating disc 301 is connected to a moving caster 305 through a connecting rod 302. The bottom end of the moving caster 305 is connected to a first moving gear 306. And the outside of the moving caster 305 is clamped inside the clamping wheel 304 through a clamping structure. The moving caster 305 and the first moving gear 306 can move up and down in the clamping wheel 304. The outside of the connecting rod 302 is connected to a second moving gear 308 through a connecting plate. And the second moving gear 308 and the first moving gear 306 do not simultaneously mesh with the intermediate gear 307 in the middle. Below the second moving gear 308, a connecting shaft 310 penetrating the mounting bracket 401 is provided. And on the outside of the connecting shaft 310, an articulated block 406 is hinged through a rotating block 407. The threaded rod 404 at the top of the articulated block 406 penetrates the arc-shaped block 403 on one side of the connecting shaft 310. And the position of the threaded rod 404 in the arc-shaped block 403 is adjusted by rotating the nut 405 on its outside. A driving motor 402 is installed at the rear of the arc-shaped block 403.

[0039] In this embodiment, the valve to be tested 2 is a common low-temperature globe valve with a wheel disc at the top. When closing and opening the valve core, it is through rotating the wheel disc. The wheel disc drives the valve stem to rotate. The valve stem is generally of a threaded rod structure. As it rotates up or down, the valve core driven by its bottom rises or falls. When the valve core contacts the valve seat inside the globe valve, the cavity for the intermediate fluid is completely closed. On the contrary, when the valve core rises and keeps the maximum distance from the valve seat, the cavity is completely opened. In this embodiment, inside the detection box 1, there is not only the valve to be tested 2 but also an input pipe and an output pipe installed on both sides of the valve to be tested 2. Detection equipment is also installed at the connection between the input pipe and the output pipe and the valve to be tested 2. It can be a flow detection device to observe the sealing performance of the globe valve through the input flow and the output flow. Or pressure detection equipment can be installed. Pumps are installed at the ends of the input pipe and the output pipe to be responsible for transporting the low-temperature fluid. Because the low-temperature fluid has a very low temperature, a heat preservation structure can be set inside the detection box 1. In addition, because the temperature of the low-temperature fluid is very low, the valve stem is very likely to freeze. If the connection between the valve stem and the valve body is frozen, it will be impossible to easily rotate the valve stem for detection. The disc handle 201 is a common wheel disc structure. The inside of the ring is usually divided into three petals by partitions, or it can be multiple petals. After the lead screw 503 extends into the gap therein, it makes a revolution, and the edge contacts the partition inside the disc handle 201, thus pushing the disc handle 201 to rotate. Therefore, this device is suitable for detecting globe valves with a wheel disc structure.

[0040] Specifically, 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 triangular mark is provided at the top of the detection box 1. The connecting rod 302 passes through the detection box 1 and extends into its interior, and the connecting rod 302 moves up and down inside the detection box 1.

[0041] In this embodiment, when the disk handle 201 is rotated for the first time, the rotating disk 301 is rotated manually because it is necessary to know how many circles or degrees the disk handle 201 needs to be rotated to completely open or close the valve core for the first time. The first rotation is manually driven, and the rotation angle is known through the scale and triangular mark on the rotating disk 301, so as to conveniently adjust the angle of the threaded rod 404 on the arc block 403 according to a certain ratio.

[0042] Specifically, a limiting member 303 is connected to the outside of the connecting rod 302. Positioning balls matching the limiting member 303 are provided inside the valve to be tested 2. A connecting shaft is provided at the top of the second moving gear 308, and the connecting shaft rotates under the connecting plate through a bearing. A limiting member 303 is connected to the outside of the connecting shaft, and positioning balls matching it are provided inside the valve to be tested 2.

[0043] In this embodiment, after knowing the rotation angle during the first rotation, the rotating disk 301 can be lifted, together with the connecting rod 302, the limiting member 303, the moving camming wheel 305, and the first moving gear 306. After the staff releases their hand, the positioning balls outside the limiting member 303 will limit it to keep it in the lifted state. The specific structure of the limiting member 303 can be that multiple groups of balls are provided on the outside of a metal ring, and the balls are made of rubber. When lifting upward, the adjacent two groups of rubber balls are clamped with the positioning balls provided 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.

[0044] Specifically, multiple groups of protrusions 3041 are equidistantly arranged on the inner wall of the camming wheel 304, and the moving camming wheel 305 is located inside the multiple groups of protrusions 3041. A first spring 3051 is connected to the inside of the moving camming wheel 305, and one end of the first spring 3051 is connected to a ball 3052. The number of balls 3052 is multiple groups, and the multiple groups of balls 3052 are located between the protrusions 3041.

[0045] In this embodiment, two sets of baffles can be arranged inside the detection box 1 above the moving clamping wheel 305. The function of the baffles is to block the lifted balls 3052 to prevent the balls 3052 from expanding a long distance under the action of the first spring 3051, which may cause inconvenience when pressing them into the clamping wheel 304. The baffles will enable the balls 3052 to smoothly enter the bumps 3041 during the lifting and pressing processes. When the rotating disk 301 is not lifted, the first moving gear 306 meshes with the intermediate gear 307. After the first moving gear 306 is lifted, the first moving gear 306 no longer meshes with the intermediate gear 307, and the intermediate gear 307 meshes with the second moving gear 308. Therefore, at this time, the intermediate gear 307 is not driven by the rotating disk 301, but by the drive motor 402.

[0046] Specifically, a sleeve 309 is arranged below the second moving gear 308 and above the connecting shaft 310, and the sleeve 309 is located above the mounting bracket 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-shaped block 403, and a scale is arranged on the outside of the arc-shaped block 403. The threaded rod 404 passes through the limiting groove 4031 and extends to its outside, and a nut 405 is connected to the outside of the threaded rod 404 by a thread. The nut 405 is located outside the limiting groove 4031.

[0047] In this embodiment, when the rotating disk 301 is lifted, the second moving gear 308 also rises. The second moving gear 308 is positioned after being lifted through the connecting shaft arranged at the top and the limiting member 303 on its outside. The sleeve 309 includes an upper sleeve and a lower sleeve. When lifting, the upper sleeve in the sleeve 309 is pulled out of the lower sleeve, and this process does not affect the transmission during the rotation process.

[0048] Specifically, the mounting bracket 401 penetrates through the detection box 1 and extends to its outside. The output shaft of the drive motor 402 penetrates through the mounting bracket 401 and extends to its inside, and the drive motor 402 is located outside the detection box 1.

[0049] In this embodiment, the arc-shaped block 403 located outside the detection box 1 facilitates the adjustment operation. When the arc-shaped block 403 is driven by the driving motor 402 to rotate, the hinge block 406 will rotate around the hinge point of the rotating block 407, thereby driving the connecting shaft 310 to perform a reciprocating rotation within a certain range. The rotation of the connecting shaft 310 drives the rotation of the second moving gear 308, thereby driving the intermediate gear 307 engaged with it 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-shaped 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; 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. Among them, the radian size of the arc-shaped block 403, the sizes of the second moving gear 308 and the intermediate gear 307 are all determined according to the usage requirements. The gear sizes and the radian size of the arc-shaped block 403 in the attached drawings do not limit the actual ratio.

[0050] Please refer to Figure 7 , 8 and Figure 9 , a detection device and a detection method for a low-temperature cut-off valve. A heat fusion assembly 5 that descends and unfolds is arranged on one side of the lead screw 503, and the steam ejected by the heat fusion assembly 5 contacts the valve stem of the valve to be tested 2.

[0051] In this embodiment, the lifting motor 501 is installed above the intermediate gear 307 and rotates following the rotation of the intermediate gear 307. Therefore, a mobile power source can be installed on the intermediate gear 307 to provide electrical energy for the lifting motor 501. The pulley group 502 includes pulleys and belts. The number of pulleys can be multiple groups. The lead screw 503 is driven to rotate by the pulley group, so the number of lead screws 503 can also be multiple groups, and the number of corresponding steam spraying plates 509 can also be multiple groups. When multiple groups of steam spraying plates 509 are unfolded simultaneously, the valve stem will be surrounded more comprehensively, and the ice melting effect will be better.

[0052] Specifically, the heat fusion assembly 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 lead screw 503. The outside of the lead screw 503 is connected to a lifting block 504. A fixed upper rod 505 is arranged on one side of the lead screw 503, and the bottom end of the fixed upper rod 505 is connected to a fixed lower rod 506. A flipping groove 5061 is formed in the fixed lower rod 506.

[0053] In this embodiment, the fixed upper rod 505 is installed below the intermediate gear 307 and corresponds to the number of lead screws 503. The fixed upper rod 505 and the fixed lower rod 506 are of an integral structure. However, a flipping groove 5061 is provided in the fixed lower rod 506. The setting trajectory of the flipping groove 5061 generally includes a vertical portion and a flipping portion. The positioning block 508 initially moves in the vertical portion and then moves along the flipping portion. The flipping angle of the flipping portion can be 90 degrees, so that the steam spraying plate 509 flips 90 degrees. The steam spraying plate 509 is vertically arranged in the initial state and does not affect entering the inside of the disc handle 201. After flipping 90 degrees, it is in the unfolded state. Since it has already entered the inside of the disc handle 201 at this time, it doesn't matter even if it unfolds. The unfolded steam spraying plate 509 can increase the contact area between the steam sprayed by the steam nozzle and the valve rod. Multiple groups of steam spraying plates 509 are arranged oppositely to accelerate the ice melting speed.

[0054] Specifically, an outer sleeve rod 507 is sleeved outside the fixed lower rod 506, and a bearing 5071 is provided on the outside 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, and the positioning block 508 penetrates through the outer sleeve rod 507 and extends into the flipping groove 5061, and the positioning block 508 moves inside the flipping groove 5061.

[0055] In this embodiment, the lifting block 504 drives the outer sleeve rod 507 to descend through the bearing 5071. During this process, due to the presence of the bearing 5071, the actions of the outer sleeve rod 507 descending and rotating are satisfied, and the second spring 5081 gradually retracts during the descending process.

[0056] Specifically, a second spring 5081 is connected to the bottom end of the positioning block 508. One side of the bottom end of the fixed lower rod 506 is connected with a mounting block, and one end of the second spring 5081 is located on the mounting block. A steam spraying plate 509 is installed below the outer sleeve rod 507, and multiple groups of steam nozzles are provided on the steam spraying plate 509. Multiple groups of steam nozzles are commonly connected to a steam pipe, and a steam generating device is installed at one end of the steam pipe.

[0057] In this embodiment, the lower half of the outer sleeve rod 507 is not a complete hollow cylindrical sleeve structure. Since an installation 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 actions of descending and rotating. After the steam generating device generates steam, it is sprayed out through the steam pipe and the steam nozzle, and is sprayed between the valve stem and the valve body, achieving the effect of rapid ice melting and avoiding the situation where the valve stem cannot rotate. Since the steam pipe will rotate and turn to a certain extent, a relatively thick pipe diameter can be used, and the situation of torsion and blockage will not occur. Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can 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 low-temperature stop valve, comprising a detection box (1), characterized in that: Inside the detection box (1), the valve to be tested (2) is placed, and the disc handle (201) at the top of the valve to be tested (2) is penetrated by multiple vertical lead screws (503). At the top of the lead screw (503), a rotating assembly (3) for driving the disc handle (201) to rotate is installed. On one side of the rotating assembly (3), an adjusting assembly (4) for controlling the rotation amplitude of the disc handle (201) is provided. On one side of the lead screw (503), a heat fusion assembly (5) that unfolds downward is provided, and the steam ejected by the heat fusion assembly (5) contacts the valve stem of the valve to be tested (2). The rotating assembly (3) includes a rotating disc (301). At the bottom end of the rotating disc (301), a moving caster (305) is connected through a connecting rod (302). At the bottom end of the moving caster (305), a first moving gear (306) is connected. The outside of the moving caster (305) is clamped inside the clamping wheel (304) through a clamping structure. The moving caster (305) and the first moving gear (306) can move up and down in the clamping wheel (304). On the outside of the connecting rod (302), a second moving gear (308) is connected through a connecting plate, and the second moving gear (308) and the first moving gear (306) do not simultaneously mesh with the intermediate gear (307). Below the second moving gear (308), a connecting shaft (310) passing through the mounting bracket (401) is provided. On the outside of the connecting shaft (310), a hinge block (406) is hinged through a rotating block (407). A threaded rod (404) at the top of the hinge block (406) penetrates an arc-shaped block (403) on one side of the connecting shaft (310), and the position of the threaded rod (404) in the arc-shaped block (403) is adjusted by rotating the nut (405) on its outside. A driving motor (402) is installed at the rear of the arc-shaped block (403).

2. The detection device of a low-temperature cut-off valve according to claim 1, wherein: The rotating disc (301) is located outside the top of the detection box (1), and a scale is provided on the rotating disc (301). A triangular mark is provided at the top of the detection box (1). The connecting rod (302) penetrates the detection box (1) and extends into its interior, and the connecting rod (302) moves up and down inside the detection box (1).

3. The detection device for a low-temperature stop valve according to claim 2, characterized in that: A limiting member (303) is connected to the outside of the connecting rod (302). Positioning balls matching the limiting member (303) are provided inside the valve to be tested (2). At the top of the second moving gear (308), a connecting shaft is provided, and the connecting shaft rotates under the connecting plate through a bearing. A limiting member (303) is connected to the outside of the connecting shaft. Positioning balls matching it are provided inside the valve to be tested (2).

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

5. The detection device of a low-temperature cut-off valve according to claim 4, characterized in that: 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 bracket (401). The rotating block (407) is fixedly installed on the outer side of the connecting shaft (310). A limiting groove (4031) is arranged inside the arc-shaped block (403), and a scale is arranged on the outer side of the arc-shaped block (403). The threaded rod (404) penetrates through the limiting groove (4031) and extends to the outside thereof, and a nut (405) is connected to the outer side of the threaded rod (404) through threads. The nut (405) is located outside the limiting groove (4031).

6. The detection device for a low-temperature stop valve according to claim 5, characterized in that: The mounting bracket (401) penetrates through the detection box (1) and extends to the outside thereof. The output shaft of the driving motor (402) penetrates through the mounting bracket (401) and extends to the inside thereof, and the driving motor (402) is located outside the detection box (1).

7. The detection device for a low-temperature stop valve according to claim 6, characterized in that: The heat fusion assembly (5) includes a lifting motor (501), and a pulley group (502) is connected to the output end of the lifting motor (501). The pulley group (502) is located at the top of the intermediate gear (307), and a lead screw (503) is connected to the bottom end of the pulley group (502). A lifting block (504) is connected to the outer side of the lead screw (503). A fixed upper rod (505) is arranged on one side of the lead screw (503), and a fixed lower rod (506) is connected to the bottom end of the fixed upper rod (505). A flipping groove (5061) is formed in the fixed lower rod (506).

8. The detection device for a low-temperature cut-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), and the positioning block (508) penetrates through the outer sleeve rod (507) and extends into the flipping groove (5061) internally. The positioning block (508) moves inside the flipping groove (5061).

9. The detection device for a low-temperature stop valve according to claim 8, wherein: A second spring (5081) is connected to the bottom end of the positioning block (508). One side of the bottom end of the fixed lower rod (506) is connected with a mounting block, and one end of the second spring (5081) is located on the mounting block. A steam spraying plate (509) is installed below the outer sleeve rod (507), and multiple groups of steam nozzles are arranged on the steam spraying plate (509). The multiple groups of steam nozzles are jointly connected to a steam pipe, and one end of the steam pipe is installed with a steam generating device.

10. A detection method using the detection device of the low-temperature cut-off valve according to claim 9, characterized in that: Including the following steps: Step 1: Place the valve to be tested (2) inside the detection box (1) so that the lead screw (503) and the fixed upper rod (505) pass through the disc handle (201). After placement, detection can be carried out inside the detection box (1). Let the cryogenic fluid enter from one end of the valve to be tested (2) and output from the other end. Observe the input and output pressure and flow data of the cryogenic fluid through the devices installed at the input and output ports: Step 2: Then, the valve stem can be tested. When the cryogenic fluid passes through the valve to be tested (2), it may cause the valve stem to freeze, making it impossible to rotate the valve stem at this time. Therefore, first start the lifting motor (501) so that the lifting motor (501) drives the lead screw (503) to rotate through the pulley group (502). During the rotation of the lead screw (503), the lifting block (504) will be driven to descend. The lifting block (504) drives the outer sleeve rod (507) to descend through the bearing (5071), causing the outer sleeve rod (507) to descend outside the fixed lower rod (506). During the descent of the outer sleeve rod (507), the positioning block (508) will move along the setting of the flipping groove (5061). When the positioning block (508) moves down close to the end of the flipping groove (5061), it will rotate along the flipping part of the flipping groove (5061), thereby driving the entire outer sleeve rod (507) to rotate and causing the steam spraying plate (509) to rotate, unfolding the originally stored steam spraying plate (509). The steam nozzles on the unfolded steam spraying plate (509) melt the ice on the outside of the valve stem, melting the frozen part on the outside of the valve stem and enabling the valve stem to rotate normally; Step 3: Before rotating the valve stem, first rotate the rotating disc (301). The rotating disc (301) drives the first moving gear (306) to rotate through the connecting rod (302). At this time, the first moving gear (306) meshes with the intermediate gear (307), so the intermediate gear (307) will also rotate. The intermediate gear (307) drives the lead screw (503) and the fixed upper rod (505) passing through the disc handle (201) below to rotate, and uses the rod to drive the disc handle (201) to rotate, thereby opening the valve to be tested (2). The rotation angle can be known through the scale on the outside of the rotating disc (301) and the triangular mark at the top of the detection box (1). After rotating the rotating disc (301) to drive the valve stem to completely open or close the valve core, lift the rotating disc (301) upward. The rotating disc (301) drives the moving caster (305) and the first moving gear (306) to move upward through the connecting rod (302), causing the first moving gear (306) to enter the inside of the engaging wheel (304) and unable to mesh with the intermediate gear (307). The limiting member (303) and the limiting balls arranged inside the detection box (1) will position the lifted connecting rod (302); Step 4: While the connecting rod (302) is lifted, the second moving gear (308) is lifted together by the connecting plate, so that the second moving gear (308) is located on one side of the intermediate gear (307) and remains in a meshing state with it, to adjust the position of the angle-adjusting threaded rod (404) recorded on the rotating disc (301) inside the arc-shaped block (403). After loosening the nut (405), adjust the position of the threaded rod (404) according to the scale on the arc-shaped 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) rotates to the corresponding scale on the arc-shaped block (403), the nut (405) can be tightened in the reverse direction to position it at the corresponding scale position of the arc-shaped block (403). Then, the drive motor (402) can be started. After the drive motor (402) is started, it will drive the arc-shaped block (403) 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 rotate reciprocally within a certain range, so that the connecting shaft (310) drives the second moving gear (308) to rotate reciprocally within a certain range, thereby driving the meshing intermediate gear (307) to rotate reciprocally, and detecting whether the valve stem can drive the valve core to open and close normally repeatedly in a low-temperature environment.

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