A working environment control chamber for factory inspection of low-temperature valves

Abstract

A working condition environment control chamber for factory inspection of low-temperature valves comprises a chamber body, a base, an impact simulation device, a cam and a switching drive device; the chamber body is fixedly mounted on the base; a sliding frame is slidably mounted on the base; a blocking block is fixedly mounted on the sliding frame, and a clamping rod capable of entering the interior of the chamber body is fixedly mounted on the blocking block; a sleeve is slidably mounted on the clamping rod, a toggle block is fixedly mounted on the sleeve and a snap ring is elastically mounted on it through a spring; the snap ring is slidably mounted on the clamping rod; the driving frame of the impact simulation device is slidably mounted on the sliding frame, the driving frame slides and is elastically mounted with a toggle rod, the limit frame is slidably mounted on the sliding frame and a platform with a slope is fixed thereon, and the toggle rod can move upward to the platform along the slope of the limit frame; the cam is rotatably mounted on the blocking block and can push the snap ring to move; the switching drive device is used to drive the driving frame to move or drive the cam to rotate; the present invention can simulate the working condition of a low-temperature valve being subjected to impact or continuous pressure.

Description

Technical Field

[0001] The present invention relates to the technical field of valve working condition simulation, and in particular to a working condition environment control chamber for factory inspection of low-temperature valves. Background Art

[0002] Cryogenic valves (such as those for LNG, liquid nitrogen, oxygen, and helium) are key components in the energy, chemical, and aerospace industries. Their sealing, material cryogenic resistance, and operational reliability directly impact system safety. Cryogenic valves must maintain performance in extreme operating conditions below -196°C, so they undergo rigorous testing in simulated, low-temperature environments before leaving the factory.

[0003] Currently, the industry generally uses liquid nitrogen immersion to simulate cryogenic environments, testing valves by immersing them in a liquid nitrogen dewar. Existing cryogenic valve operating environment simulators lack impact testing capabilities and can only perform static valve testing. They are unable to replicate the dynamic operating conditions, such as pressure and impact, that can occur during actual cryogenic valve operation, and cannot reflect the low-temperature + impact coupling effect. Simulating dynamic operating conditions such as pressure and impact requires additional testing on a vibration table, which disrupts the temperature environment and affects the final test results.

[0004] Therefore, it is necessary to invent an environmental control chamber for low-temperature valve factory inspection that can simulate dynamic working conditions such as pressure and impact. Summary of the Invention

[0005] In response to the above problems, the present invention proposes a working environment control chamber for factory inspection of cryogenic valves, the technical solution used is:

[0006] A working environment control chamber for factory inspection of cryogenic valves, comprising a chamber body, a base, a clamping rod, a sleeve, an impact simulation device, a cam, a switching drive device and an operating table;

[0007] The bin body is fixedly mounted on the base; a sliding frame located on both sides of the bin body is slidably mounted on the base and is driven to slide by a sliding device; a blocking block is fixedly mounted on the sliding frame, and a clamping rod capable of entering the interior of the bin body is fixedly mounted on the blocking block; a sleeve is slidably mounted on the clamping rod, a toggle block is fixedly mounted on the sleeve, and a snap ring is elastically mounted on the sleeve via a spring; the snap ring is slidably mounted on the clamping rod, and the snap ring intermittently contacts the blocking block;

[0008] The impact simulation device includes a driving frame, a toggle rod, a limiting frame, and an adjusting screw; the driving frame is slidably mounted on the sliding frame, and a toggle rod corresponding to the toggle block is slidably and elastically mounted on the driving frame; the limiting frame is slidably mounted on the sliding frame and is driven to move by the adjusting screw mounted on the sliding frame; a platform with a slope is fixed on the limiting frame, and the toggle rod can move upward along the slope of the limiting frame to the platform;

[0009] The cam is rotatably mounted on the blocking block and is capable of pushing the snap ring to move when rotating;

[0010] The switching drive device is used to drive the drive frame to move or drive the cam to rotate;

[0011] The operating console is used to control the operation of the entire control chamber.

[0012] Furthermore, the sliding device includes a pushing cylinder, a sliding block and a connecting rod. The pushing cylinder body is fixedly installed on the outer wall of the warehouse body, and the telescopic end is fixedly connected to the sliding block; the sliding block is vertically slidably installed on the outer wall of the warehouse body; a connecting rod is provided between each sliding frame and the sliding block, and the two ends of the connecting rod are respectively rotatably installed on the sliding block and the corresponding sliding frame.

[0013] Furthermore, the impact simulation device further comprises a distance sensor, which is mounted on the sliding frame and is used to monitor the position of the limiting frame.

[0014] Furthermore, the switching drive device includes a switching frame, a switching cylinder, a sliding drive assembly, a driving rack, a driving gear 2 and a transmission assembly; the switching frame is slidably mounted on the blocking block; the switching cylinder body is fixedly mounted on the sliding frame, and the telescopic end is fixedly connected to the switching frame; the driving rack is slidably mounted on the switching frame, and a card block is fixedly mounted on the driving rack, and a card slot is provided for the corresponding card block on the driving frame; the sliding drive assembly is used to drive the driving rack to move; the driving gear 2 is rotatably mounted on the blocking block and intermittently engages with the driving rack; the driving gear 2 is synchronously connected to the cam through the transmission assembly.

[0015] Furthermore, the sliding drive assembly includes a drive motor and a drive gear 1; the drive motor is fixedly mounted on the switching frame, and its output end is coaxially fixedly connected to the drive gear; the drive gear 1 is engaged with the drive rack.

[0016] Furthermore, the transmission assembly includes an input gear, an output rack and a driven gear; the input gear is coaxially fixedly mounted on the driving gear 2; the output rack is slidably mounted on the blocking block and meshes with the input gear; the driven gear is coaxially fixedly mounted on the base circle center of the cam and meshes with the output rack.

[0017] Furthermore, a sealing cover is provided on the top of the warehouse body.

[0018] Furthermore, the middle portion of the clamping rod is hollow, and the hollow middle portion can be communicated with the low-temperature valve and connected to an external medium pipeline.

[0019] Furthermore, a through hole is provided on the warehouse body corresponding to the clamping rod, and the clamping rod can move with the sliding frame and pass through the corresponding through hole to squeeze the low-temperature valve in the warehouse body.

[0020] Furthermore, when the spring is in a relaxed state, the inner end of the sleeve presses against the inner end of the clamping rod.

[0021] Since the present invention adopts the above technical solution, compared with the prior art, the present invention has the following advantages:

[0022] 1. The present invention adopts the coordinated design of the clamping rod, the sleeve, the impact simulation device and the switching drive device. The switching drive device can drive the driving frame of the impact simulation device to move, so that the toggle rod of the impact simulation device pushes the sleeve to move. When the toggle block moves to the top of the slope of the limit frame, the sleeve will separate from the toggle rod and impact the clamping rod under the action of the spring rebound. The impact force is transmitted to the fixed low-temperature valve through the clamping rod, thereby simulating the working condition of the low-temperature valve being subjected to axial impact in actual work.

[0023] 2. The impact simulation device of the present invention adjusts the size of the simulated impact force by adjusting the screw to drive the limit frame to move and adjust the position of the limit frame, and monitors the position of the limit frame in real time through the distance sensor to achieve the effect of accurately controlling the size of the impact force.

[0024] 3. The present invention adopts the coordinated design of the clamping rod, sleeve, cam and switching drive device. The switching drive device can drive the cam to rotate. The rotation of the cam pushes the retaining ring on the sleeve to move, so that the spring between the retaining ring and the sleeve is compressed, generating continuous pressure. The continuous pressure is transmitted to the fixed cryogenic valve through the sleeve and the clamping rod, thereby simulating the working condition of the cryogenic valve being subjected to continuous axial pressure in actual work, and the magnitude of the continuous pressure can be adjusted by adjusting the rotation angle of the cam.

[0025] 4. The switching drive device of the present invention can freely switch between the two modes of impact simulation and continuous pressure simulation, thereby simulating various impact and pressure conditions in actual working conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0027] Figure 2 This is a schematic diagram of the structure of the present invention with the bin cover removed.

[0028] Figure 3 This is a structural diagram of the present invention without the warehouse body.

[0029] Figure 4 The figure is a schematic diagram of the assembly structure of the sliding frame, clamping rod, sleeve, impact simulation device, cam and switching drive device of the present invention.

[0030] Figure 5 Schematic diagram of the structure of the sliding frame of the present invention.

[0031] Figure 6 This is a schematic diagram of the assembly structure of the sliding frame, clamping rod and sleeve of the present invention.

[0032] Figure 7 It is a schematic diagram of the exploded structure of the clamping rod and sleeve of the present invention.

[0033] Figure 8 It is a front side schematic diagram of the assembly structure of the sliding frame, clamping rod, sleeve, impact simulation device and switching drive device part of the present invention.

[0034] Figure 9 It is a rear side schematic diagram of the assembly structure of the sliding frame, clamping rod, sleeve, impact simulation device and switching drive device part of the present invention.

[0035] Figure 10 It is a schematic diagram of the assembly structure of the clamping rod, sleeve, impact simulation device and switching drive device of the present invention.

[0036] Figure 11 Schematic diagram of the structure of the impact simulation device of the present invention.

[0037] Figure 12 This is a schematic diagram of the assembly structure of the sliding frame, clamping rod, sleeve, cam and switching drive device of the present invention.

[0038] Figure 13 This is a schematic diagram of the assembly structure of the clamping rod, sleeve, cam and switching drive device of the present invention.

[0039] Figure 14 It is a schematic diagram of the assembly structure of the cam and the switching drive device of the present invention.

[0040] Figure Number:

[0041] 1-warehouse body; 2-base; 201-sliding frame; 2011-blocking block; 202-sliding device; 2021-pushing cylinder; 2022-sliding block; 2023-connecting rod; 3-clamping rod; 4-sleeve; 401-toggle block; 402-spring; 403-retaining ring; 5-impact simulation device; 501-driving frame; 5011-slot; 502-toggle rod; 503-limiting frame; 504-adjusting screw; 505-distance sensor; 6-cam; 7-switching drive device; 701-switching frame; 702-switching cylinder; 703-driving motor; 704-driving gear 1; 705-driving rack; 7051-block; 706-driving gear 2; 707-input gear; 708-output rack; 709-driven gear; 8-operating table. DETAILED DESCRIPTION

[0042] The technical solution of the present invention will be further specifically described below through examples and in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar improvements without violating the scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0043] In the description of the present invention, it should be noted that the terms "up", "down", "in", "out", "front", "back", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the product of the invention is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limiting the present invention.

[0044] Example:

[0045] This embodiment provides a low-temperature valve factory inspection working condition environment control chamber, such as Figure 1-Figure 3 As shown, it includes a warehouse body 1, a base 2, a clamping rod 3, a sleeve 4, an impact simulation device 5, a cam 6, a switching drive device 7 and an operating platform 8.

[0046] The warehouse body 1 is fixedly mounted on the base 2, and sliding racks 201 are horizontally slidably mounted on the base 2 at positions on both sides of the warehouse body 1; the two sliding racks 201 are driven by sliding devices 202 to move toward each other; the sliding device 202 includes a pushing cylinder 2021, a sliding block 2022 and a connecting rod 2023. The pushing cylinder 202 adopts a servo cylinder, and the cylinder body is fixedly mounted on the outer wall of the warehouse body 1. The telescopic end is fixedly connected to the sliding block 2022, and the sliding block 2022 is vertically slidably mounted on the outer wall of the warehouse body 1. A connecting rod 2023 is provided between each sliding rack 201 and the sliding block 2022, and the two ends of the connecting rod 2023 are respectively rotatably mounted on the sliding block 2022 and the corresponding sliding rack 201; a cover is provided on the top of the warehouse body 1. When simulating working conditions, the low-temperature valve is placed in the warehouse body 1.

[0047] like Figure 4-Figure 7 As shown, each sliding frame 201 is fixedly provided with a blocking block 2011, and a clamping rod 3 is fixedly installed on the blocking block 2011. The clamping rods 3 on the two sliding frames 201 are respectively located on both sides of the warehouse body 1. The warehouse body 1 is provided with through holes corresponding to the clamping rods 3. The clamping rods 3 can move with the sliding frame 201 and pass through the corresponding through holes to squeeze the cryogenic valve in the warehouse body 1. The two clamping rods 3 work together to fix the cryogenic valve; the middle part of the clamping rod 3 is hollow. When simulating working conditions, the hollow middle part is connected to the cryogenic valve and is connected to an external medium pipeline to simulate the working state of the cryogenic valve.

[0048] A sleeve 4 is slidably mounted on the clamping rod 3, and a toggle block 401 is fixedly mounted on the sleeve 4 (two toggle blocks 401 are provided in this embodiment), and a snap ring 403 is elastically mounted on the outer end of the sleeve 4 through a spring 402, and the spring 403 is a compression spring; the snap ring 403 is slidably mounted on the clamping rod 3, and the snap ring 403 intermittently contacts the blocking block 2011; when the spring 402 is relaxed, the inner end of the sleeve 4 presses against the inner end of the clamping rod 3.

[0049] like Figures 8-11 As shown, the impact simulation device 5 includes a driving frame 501, a toggle rod 502, a limiting frame 503, an adjusting screw 504 and a distance sensor 505; the driving frame 501 is horizontally slidably mounted on the sliding frame 201, and its sliding direction is parallel to the sliding direction of the sleeve 4; the driving frame 501 slides vertically and is elastically mounted with a toggle rod 502 corresponding to the toggle block 401 through a compression spring; the limiting frame 503 is horizontally slidably mounted on the sliding frame 201, and its sliding direction is parallel to the sliding direction of the sleeve 4, and is driven to move by the adjusting screw 504; the adjusting screw 504 adopts a servo screw and is mounted on the sliding frame 201, and its screw is connected to the corresponding limiting frame 503; the distance sensor 505 is mounted on the sliding frame 201 for monitoring the position of the limiting frame 503;

[0050] A platform with a slope is fixed on the limit frame 503, and the toggle rod 502 can move upward along the slope of the limit frame 503 to the platform; when the spring 402 is relaxed, when the toggle rod 502 is at the bottom of the slope, the toggle rod 502 is located at the inner end of the toggle block 401 and can push the toggle block 401 to move; when the toggle rod 502 moves upward along the slope to the platform, the toggle rod 502 disengages from the inner end of the toggle block 401 and no longer pushes the toggle block 401 to move.

[0051] like Figure 12-13 As shown, the cam 6 is rotatably mounted on the blocking block 2011 of the sliding frame 201. When the cam 6 rotates, it can push the retaining ring 403 to move, and the spring 402 compresses and squeezes the sleeve 4, which transmits continuous pressure to the clamping rod 3, thereby applying continuous pressure to the low-temperature valve fixed by the clamping rod 3; in this embodiment, two cams 6 are provided.

[0052] like Figures 8-14As shown, the switching drive device 7 includes a switching frame 701, a switching cylinder 702, a driving motor 703, a driving gear 1 704, a driving rack 705, a driving gear 2 706, an input gear 707, an output rack 708 and a driven gear 709; the switching frame 701 is slidably mounted on the blocking block 2011 of the sliding frame 201, and its sliding direction is perpendicular to the sliding direction of the sleeve 4; the switching cylinder 702 is a servo cylinder, the cylinder body of which is fixedly mounted on the sliding frame 201, and the telescopic end is fixedly connected to the switching frame 701; each cam 6 corresponds to a set of driving gear 1 704, driving rack 705, driving gear 2 706, input gear 707, output rack 708 and driven gear 709;

[0053] The drive motor 703 is a servo motor, fixedly mounted on the switching frame 701, with its output end coaxially fixedly connected to the drive gear 1 704; the drive rack 705 is horizontally slidably mounted on the switching frame 701 and meshes with the drive gear 1 704 of the same group. The sliding direction of the drive rack 705 is parallel to the sliding direction of the drive frame 501; a clamping block 7051 is fixedly mounted on the drive rack 705, and a clamping slot 5011 is provided on the drive frame 501 corresponding to the clamping block 7051. When the clamping block 7051 is inserted into the clamping slot 5011, the drive frame 501 and the drive rack 705 are relatively fixed, and the drive rack 705 can drive the drive frame 501 to move;

[0054] The driving gear 2 706 is rotatably mounted on the blocking block 2011 and intermittently meshes with the driving rack 705 of the same group; the input gear 707 is coaxially fixedly mounted on the driving gear 2 706 of the same group; the output rack 708 is horizontally slidably mounted on the blocking block 2011, and the output rack 708 is a double-sided rack, one side of which meshes with the input gear 707 of the same group; the driven gear 709 is coaxially fixedly mounted on the base circle center of the cam 6 and meshes with the other side of the output rack 708 of the same group; when the blocking block 7051 is embedded in the slot 5011, the driving gear 2 706 is disengaged from the driving rack 705, and after the switching cylinder 702 drives the switching frame 701 to move, the blocking block 7051 is disengaged from the slot 5011, and the driving gear 2 706 is meshed with the driving rack 705.

[0055] In this embodiment, the operating console 8 is electrically connected to various electrical components and is used to control the operation of the entire control chamber.

[0056] The working principle of this embodiment is as follows:

[0057] Preparation:

[0058] The cryogenic valve to be tested is placed in the warehouse body 1, with the cryogenic valve located between the two clamping rods 3; the push cylinder 2021 is started, the sliding block 2022 slides, and the connecting rod 2023 drives the two sliding frames to approach each other, and the two clamping rods 3 fix the cryogenic valve; the hollow middle part of the clamping rod 3 is connected to the cryogenic valve and connected to the external medium pipeline, ready to input the medium into the cryogenic valve when simulating working conditions; liquid nitrogen is injected into the warehouse body 1 to achieve a low-temperature environment inside the warehouse body 1.

[0059] In the initial state, the toggle rod 502 is located on the platform at the top of the slope of the limiting frame 503, the clamping block 7051 is embedded in the clamping groove 5011, the spring 402 is relaxed, and the inner end of the sleeve 4 presses against the inner end of the clamping rod 3.

[0060] Simulated impact conditions:

[0061] The adjusting screw 504 is started to drive the limit frame 503 to move, and the impact force of the sleeve 4 is adjusted by adjusting the position of the limit frame 503 (the distance sensor 505 monitors in real time); after the position of the limit frame 503 is adjusted, the driving motor 703 is started to drive the gear 704 to rotate, driving the driving rack 705 to move, and the driving rack 705 drives the driving frame 501 to move, so that the toggle rod 502 moves downward along the slope of the limit frame 503 to the bottom of the slope, and the toggle rod 502 moves to the inner end of the toggle block 401; then the rack 705 is driven The driving frame 501 is driven to move in the opposite direction, the toggle rod 502 pushes the toggle block 401 to move, the sleeve 4 moves outward, and the spring 402 is compressed. When the toggle rod 502 moves upward along the slope of the limit frame 503 to the platform at the top of the slope, the toggle rod 502 is separated from the toggle block 401, and the sleeve 4 impacts the clamping rod 3 under the rebound action of the spring 402. The impact force is transmitted from the clamping rod 3 to the fixed low-temperature valve; driven by the driving rack 705, the toggle rod 502 moves back and forth along the slope of the limit frame 503, and multiple impacts can be achieved.

[0062] Simulating continuous pressure conditions:

[0063] Start the switching cylinder 702, driving the switching frame 701 to move, and the driving rack 705 moves accordingly, the blocking block 7051 disengages the blocking slot 5011, and at the same time drives the rack 705 to engage with the driving gear 2 706; start the driving motor 703, the driving gear 1 704 rotates to drive the driving rack 705 to move, the driving rack 705 moves and drives the driving gear 2 706 to rotate, the input gear 707 rotates with the driving gear 2 706 and drives the output rack 708 to move, the output rack 708 moves and drives the driven gear 709 to rotate, the driven gear 709 rotates and drives the cam 6 to rotate; the rotation of the cam 6 will push the retaining ring 403, causing the spring 402 to compress, and the continuous pressure generated is transmitted to the fixed low-temperature valve through the sleeve 4 and the clamping rod 3. The moving distance of the retaining ring 403 is adjusted by adjusting the rotation angle of the cam 6, thereby adjusting the magnitude of the continuous pressure generated.

Claims

1. A working environment control chamber for factory inspection of cryogenic valves, characterized by: It includes a bin body, a base, a clamping rod, a sleeve, an impact simulation device, a cam, a switching drive device and an operating table; The bin body is fixedly mounted on the base; a sliding frame located on both sides of the bin body is slidably mounted on the base and is driven to slide by a sliding device; a blocking block is fixedly mounted on the sliding frame, and a clamping rod capable of entering the interior of the bin body is fixedly mounted on the blocking block; a sleeve is slidably mounted on the clamping rod, a toggle block is fixedly mounted on the sleeve, and a snap ring is elastically mounted on the sleeve via a spring; the snap ring is slidably mounted on the clamping rod, and the snap ring intermittently contacts the blocking block; The impact simulation device includes a driving frame, a toggle rod, a limiting frame, and an adjusting screw; the driving frame is slidably mounted on the sliding frame, and a toggle rod corresponding to the toggle block is slidably and elastically mounted on the driving frame; the limiting frame is slidably mounted on the sliding frame and is driven to move by the adjusting screw mounted on the sliding frame; a platform with a slope is fixed on the limiting frame, and the toggle rod can move upward along the slope of the limiting frame to the platform; The cam is rotatably mounted on the blocking block and is capable of pushing the snap ring to move when rotating; The switching drive device is used to drive the drive frame to move or drive the cam to rotate; The operating console is used to control the operation of the entire control chamber.

2. The working environment control chamber for factory inspection of cryogenic valves according to claim 1, characterized in that: The sliding device includes a pushing cylinder, a sliding block and a connecting rod. The pushing cylinder body is fixedly installed on the outer wall of the warehouse body, and the telescopic end is fixedly connected to the sliding block; the sliding block is vertically slidably installed on the outer wall of the warehouse body; a connecting rod is provided between each sliding frame and the sliding block, and the two ends of the connecting rod are respectively rotatably installed on the sliding block and the corresponding sliding frame.

3. The working condition environment control chamber for factory inspection of cryogenic valves according to claim 1, characterized in that: The impact simulation device further comprises a distance sensor, which is mounted on the sliding frame and is used to monitor the position of the limiting frame.

4. The working environment control chamber for factory inspection of cryogenic valves according to claim 1, characterized in that: The switching drive device includes a switching frame, a switching cylinder, a sliding drive assembly, a driving rack, a second driving gear and a transmission assembly; the switching frame is slidably mounted on the blocking block; the switching cylinder body is fixedly mounted on the sliding frame, and the telescopic end is fixedly connected to the switching frame; the driving rack is slidably mounted on the switching frame, and a card block is fixedly mounted on the driving rack, and a card slot is provided on the corresponding card block on the driving frame; the sliding drive assembly is used to drive the driving rack to move; the driving gear second is rotatably mounted on the blocking block and intermittently meshes with the driving rack; the driving gear second is synchronously connected to the cam through the transmission assembly.

5. The working environment control chamber for factory inspection of cryogenic valves according to claim 4, characterized in that: The sliding drive assembly includes a drive motor and a drive gear 1; the drive motor is fixedly installed on the switching frame, and its output end is coaxially fixedly connected to the drive gear; the drive gear 1 is engaged with the drive rack.

6. The working environment control chamber for factory inspection of cryogenic valves according to claim 4, characterized in that: The transmission assembly includes an input gear, an output rack and a driven gear; the input gear is coaxially fixedly mounted on the driving gear 2; the output rack is slidably mounted on the blocking block and meshes with the input gear; the driven gear is coaxially fixedly mounted on the base circle center of the cam and meshes with the output rack.

7. The working environment control chamber for factory inspection of cryogenic valves according to claim 1, characterized in that: A sealing cover is provided on the top of the warehouse body.

8. The working condition environment control chamber for factory inspection of cryogenic valves according to claim 1, characterized in that: The middle part of the clamping rod is hollow, and the hollow middle part can be communicated with the low-temperature valve and connected to the external medium pipeline.

9. The working environment control chamber for factory inspection of cryogenic valves according to claim 1, characterized in that: The warehouse body is provided with a through hole corresponding to the clamping rod, and the clamping rod can move with the sliding frame and pass through the corresponding through hole to squeeze the low-temperature valve in the warehouse body.

10. The working environment control chamber for factory inspection of cryogenic valves according to claim 1, characterized in that: When the spring is in a relaxed state, the inner end of the sleeve abuts against the inner end of the clamping rod.

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