Automatic unloading and pressure relief device for valve core of pressure vessel

Abstract

The application discloses a kind of pressure vessel valve core automatic unloading and pressure relief device, comprising: butt joint driving mechanism, shell, transmission cylinder, micro motor, operating tube, thrust bearing, inner spring, outer spring, in-place detection assembly, camera positioning assembly and exhaust control assembly.Butt joint driving mechanism driving device whole movement realizes and separates with gas nozzle;Micro motor rotates operating tube by transmission cylinder, and operating tube head is equipped with concave tooth for clamping and rotating out valve core;Inner spring and outer spring are all set on the outside of operating tube and are oppositely arranged with thrust bearing, and in-place detection assembly generates butt joint in-place signal by detecting whether thrust bearing simultaneously contacts inner spring and outer spring;Camera positioning assembly includes movable micro camera set in operating tube, for gas nozzle identification and anti-collision protection.The application realizes the integrated operation of gas nozzle accurate butt joint, valve core automatic rotation, pressure relief and valve core automatic discharge, compact structure, accurate butt joint, reliable sealing.

Description

Technical Field

[0001] This invention relates to the field of industrial safety pressure relief technology, and more specifically, to an automatic valve core unloading and pressure relief device for pressure vessels. Background Technology

[0002] In industrial sectors such as chemical, metallurgical, energy, and manufacturing, the safe depressurization of pressure vessels is a crucial aspect of ensuring production safety. During the filling, use, and maintenance of various pressure vessels, precise control and safe release of internal pressure are essential to ensure the safety of equipment and personnel.

[0003] Traditional pressure vessel depressurization often involves manually turning the valve stem. This method has the following significant drawbacks: firstly, it is labor-intensive and inefficient; secondly, in a high-pressure gas environment, manual operation is highly prone to causing safety accidents, posing a considerable safety hazard.

[0004] Currently, some automated pressure relief devices exist on the market, but they generally suffer from the following problems: complex structure leading to high manufacturing and maintenance costs; low docking accuracy between the device and the air nozzle, easily causing gas leakage; poor sealing effect, making it difficult to form a reliable seal under high pressure; and asynchronous valve core rotation and pressure relief action, affecting the continuity and reliability of operation. These problems make existing devices unable to meet the actual needs of modern industrial automation operations.

[0005] Furthermore, existing automated pressure relief devices generally lack effective collision protection and precise positioning mechanisms. For example, precision components such as cameras used for visual positioning are easily damaged by collisions during the docking of the device with the air nozzle, affecting the device's lifespan. At the same time, once the valve core is unscrewed, it often cannot be automatically discharged, requiring manual intervention or additional discharge mechanisms, which affects the continuity and automation of operations.

[0006] Therefore, there is an urgent need to develop an integrated device that is compact, precisely connected, reliably sealed, safe to operate, and capable of automatically unloading the valve core and efficiently depressurizing the pressure vessel, in order to solve the aforementioned problems in the existing technology. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated device that is compact in structure, precise in connection, reliable in sealing, safe in operation, and can realize automatic unloading of valve core and efficient pressure relief of pressure vessel.

[0008] The present invention provides an automatic unloading and pressure relief device for a pressure vessel valve core, comprising: The docking drive mechanism is used to drive the entire device to move so as to achieve the approach, docking and separation of the device and the air nozzle; The housing is connected to the output end of the docking drive mechanism, and one end of the housing is provided with a docking hole for docking with the air nozzle; The transmission cylinder is rotatably mounted inside the housing; A micro motor is installed inside the housing, and its output end is connected to the transmission cylinder for driving the transmission cylinder to rotate; The operating tube is a hollow tube, one end of which passes through the transmission cylinder and is circumferentially fixed to the transmission cylinder but axially slidable relative to it. Its head extends to the docking hole, and its end face is provided with concave teeth for clamping the valve core. The operating tube is provided with a limiting part. A thrust bearing is sleeved on the operating tube and located above the limiting part; Both the inner spring and the outer spring are sleeved on the outside of the operating tube. One end of each of the inner spring and the outer spring is fixedly connected to the inner wall of the housing, and the other end of each is a free end and is disposed opposite to the thrust bearing. One of the inner spring and the outer spring is in contact with the thrust bearing and is in a pre-compressed state to apply an axial preload to the operating tube, and there is a gap between the other spring and the thrust bearing. The positioning detection component is electrically connected to the inner spring and the outer spring respectively, and is used to detect whether the thrust bearing is simultaneously in contact with the inner spring and the outer spring, and to generate a docking positioning signal when they are in contact; A camera positioning component includes a miniature camera and a driving component. The miniature camera is movably disposed within the operating tube, and the driving component is used to drive the miniature camera to move axially. An exhaust control assembly is used to control the opening and closing of the exhaust passage between the inner cavity of the housing and the outside.

[0009] Furthermore, the end of the housing opposite to the mating hole is closed, and the mating hole is connected to the inner cavity of the housing through a through hole. The diameter of the through hole is smaller than the diameter of the mating hole to form a stepped portion, and a sealing rubber ring is provided at the stepped portion.

[0010] Furthermore, the positioning detection component includes a first position detection line and a second position detection line. The first position detection line is electrically connected to the inner spring, and the second position detection line is electrically connected to the outer spring. When the limiting part pushes the thrust bearing to move to simultaneously contact the inner spring and the outer spring, the inner spring and the outer spring are electrically connected through the metal surface of the thrust bearing, thereby generating the docking positioning signal.

[0011] Furthermore, the driving component of the camera positioning assembly is a miniature electric cylinder, which is fixedly installed inside the housing. Its output end is connected to the camera cable of the miniature camera through a fixing clamp, and is used to drive the miniature camera to move axially within the operating tube by pulling the camera cable.

[0012] Furthermore, the output end of the micro motor is connected to the transmission cylinder via a gear set. The gear set includes a motor gear fixedly mounted on the output end of the micro motor and a transmission cylinder gear fixedly mounted on the transmission cylinder. The motor gear meshes with the transmission cylinder gear.

[0013] Furthermore, a small through-hole is provided on the wall of the operating tube, located below the limiting part, for guiding the gas entering the operating tube into the inner cavity of the housing.

[0014] Furthermore, it also includes a pressure sensor installed inside the housing for detecting the pressure inside the housing cavity.

[0015] Furthermore, the exhaust control assembly includes a solenoid valve mounted on the exhaust passage.

[0016] Furthermore, a guide groove is provided on the outer side of the docking hole to guide the air nozzle to dock with the docking hole.

[0017] Furthermore, it also includes a controller, which is connected to the docking drive mechanism, the positioning detection component, the camera positioning component, the micro motor, the exhaust control component, and the air pressure sensor, respectively, and is used to control the coordinated action of each component according to the received signal to complete the nozzle docking identification, valve core unscrewing, pressure relief and exhaust, and device reset.

[0018] Compared with the prior art, the technical solution provided by the present invention has the following beneficial effects: 1. Achieve fully automated operation, significantly improving work efficiency and safety: This invention integrates a docking drive mechanism, camera positioning component, positioning detection component, power transmission component, and exhaust control component, which can automatically complete the entire process of valve identification, anti-collision protection, precise docking, valve core unscrewing, pressure relief and exhaust, and device reset. It replaces the traditional method of manually turning the valve core, greatly reducing labor intensity and operational risks, and improving the automation and safety of pressure relief operation.

[0019] 2. Precise docking and reliable sealing to effectively prevent gas leakage: The present invention has docking holes and guide grooves at the end of the shell. The guide grooves guide the gas nozzle to dock precisely with the docking holes. A sealing rubber ring is provided on the stepped part inside the docking hole. After the device is docked, it is further pressed by the docking drive mechanism, which causes the sealing rubber ring to deform elastically and form a strictly sealed space, effectively preventing gas leakage during the depressurization process and ensuring the reliability of the depressurization operation.

[0020] 3. Active anti-collision protection extends the service life of precision components: This invention movably mounts a miniature camera inside the operating tube and drives its extension and retraction via a miniature electric cylinder. During the device's approach to the air nozzle, if a collision risk is detected with the camera, the controller controls the miniature electric cylinder to move the camera backward, achieving active anti-collision protection; the camera is then extended again when identification and positioning are required. This design effectively avoids collision damage to precision components during docking, improving the device's service life and reliability.

[0021] 4. Unique positioning detection mechanism for precise control: This invention employs a positioning detection mechanism using an inner spring, an outer spring, and a thrust bearing. Initially, one spring is pre-compressed and in contact with the thrust bearing, applying axial preload to the operating tube, stabilizing the tube head at the front end. The other spring has a gap with the thrust bearing. When the operating tube head is pushed backward by the air nozzle, the limiting part pushes the thrust bearing upward until it simultaneously contacts both the inner and outer springs, enabling electrical connection and generating a positioning signal. This design utilizes the pre-compressed spring to provide preload to ensure operating tube stability, while the gap ensures the signal is triggered only upon positioning, resulting in a compact structure and reliable response.

[0022] 5. Sliding fit design to decouple torque transmission and axial movement: In this invention, the operating tube is inserted into the transmission cylinder and is circumferentially fixed to the transmission cylinder but axially sliding relative to it. This design ensures that the rotational torque of the micro motor can be effectively transmitted to the operating tube through the transmission cylinder to drive the operating tube to rotate and unscrew the valve core, while not affecting the axial movement of the operating tube under the pressure of the air nozzle or the elastic force of the spring. This achieves decoupling of rotational motion and axial motion, resulting in a compact structure and high transmission efficiency.

[0023] 6. Automatic valve core ejection ensures continuous operation: After the valve core is unscrewed, during the device's retraction process, the unscrewed valve core is automatically ejected forward under the elastic restoring force in a compressed state, disengaging from the docking hole range. This achieves automatic unloading of the valve core without manual intervention or additional discharge mechanisms, ensuring continuous operation and making it particularly suitable for automated production lines.

[0024] 7. Precise pressure relief process control: This invention uses a pressure sensor installed inside the housing to monitor the pressure changes within the housing cavity in real time. The controller controls the opening and closing of the solenoid valve based on the detection signal from the pressure sensor, and automatically controls the device to retract and reset when the pressure drops to a preset value. This achieves closed-loop precise control of the pressure relief process, avoiding over- or under-pressure relief and ensuring high operational accuracy.

[0025] 8. Compact structure, modular design, and wide applicability: This invention organically integrates the docking drive mechanism, housing, transmission cylinder, operating pipe, spring assembly, positioning detection assembly, camera positioning assembly, exhaust control assembly, and controller into a single unit. The overall structure is compact, with modular component design, facilitating installation and maintenance. It can be widely applied to automated pressure relief operations on various pressure vessels in chemical, metallurgical, energy, and manufacturing industries, demonstrating excellent versatility and promotional value. Attached Figure Description

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

[0027] Figure 2 These are schematic diagrams of different working states of the device of the present invention, wherein (a) is the docking state, (b) is the depressurization state, and (c) is the valve core unscrewed state.

[0028] In the diagram: 1. Housing; 101. Docking hole; 102. Guide groove; 2. Transmission cylinder; 201. Transmission cylinder gear; 3. Support bearing; 4. Miniature motor; 401. Motor gear; 5. Operating tube; 501. Limiting part; 502. Small air hole; 6. Thrust bearing; 7. Inner spring; 8. Outer spring; 9. Position detection component; 10. Miniature camera; 11. Camera cable; 12. Miniature electric cylinder; 13. Fixing clamp; 14. Solenoid valve; 15. Air pressure sensor; 16. Sealing rubber ring; 17. Air nozzle; 18. Valve core. Detailed Implementation

[0029] The technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention. Example

[0030] like Figure 1 As shown, this embodiment provides an automatic unloading and pressure relief device for a pressure vessel valve core, including: a docking drive mechanism, a housing 1, a transmission cylinder 2, a micro motor 4, an operating tube 5, a thrust bearing 6, an inner spring 7, an outer spring 8, a positioning detection component 9, a camera positioning component, an exhaust control component, a pressure sensor 15, and a controller.

[0031] The docking drive mechanism is used to drive the overall movement of the device to achieve the approach, docking, and separation of the device from the air nozzle 17. The specific form of the docking drive mechanism can be an electric cylinder, a pneumatic cylinder, a linear motor, a lead screw and nut mechanism, or connected to the robot arm, with its output end fixedly connected to the housing 1.

[0032] The housing 1 is a cylindrical structure closed at one end and open at the other. The housing 1 is connected to the output end of the docking drive mechanism, and the open end of the housing 1 has a docking hole 101 for docking with the air nozzle 17. Specifically, the end of the housing 1 opposite to the docking hole 101 is closed. The docking hole 101 communicates with the inner cavity of the housing 1 through a through hole. The diameter of the through hole is smaller than the diameter of the docking hole 101, thus forming a stepped portion at the connection between the docking hole 101 and the through hole. A sealing rubber ring 16 is provided at this stepped portion to achieve an airtight seal after the device is docked with the air nozzle 17. A guide groove 102 is also provided on the outer side of the docking hole 101 to guide the precise docking of the air nozzle 17 with the docking hole 101.

[0033] The transmission cylinder 2 is rotatably mounted inside the housing 1 via a support bearing 3. The support bearing 3 is preferably a deep groove ball bearing, with its outer ring fixedly connected to the inner wall of the housing 1 and its inner ring fixedly connected to the transmission cylinder 2 to ensure the rotational stability of the transmission cylinder 2.

[0034] A micro motor 4 is installed inside the housing 1, and its output end is connected to the transmission cylinder 2 via a gear set to drive the transmission cylinder 2 to rotate. The gear set includes a motor gear 401 fixedly installed at the output end of the micro motor 4, and a transmission cylinder gear 201 fixedly installed on the transmission cylinder 2. The motor gear 401 meshes with the transmission cylinder gear 201. The micro motor 4 drives the transmission cylinder 2 to rotate after the speed reduction and torque increase are achieved by a reducer.

[0035] The operating tube 5 is a hollow tube, with one end inserted into the transmission cylinder 2. It is circumferentially fixed to the transmission cylinder 2 but axially slidable relative to it. In this embodiment, the operating tube 5 and the transmission cylinder 2 are circumferentially fixed through a keyway fit. That is, the outer wall of the operating tube 5 is provided with a key, and the inner wall of the transmission cylinder 2 is provided with a corresponding keyway, so that the operating tube 5 can rotate synchronously with the transmission cylinder 2 while also sliding relative to it axially. The head of the operating tube 5 extends to the docking hole 101, and the end face is provided with concave teeth for locking the valve core 18. These concave teeth match the groove on the head of the valve core 18. The operating tube 5 is also provided with a limiting part 501, which is located at the end of the operating tube 5 near the through hole. Its outer diameter is larger than the diameter of the through hole, which is used to limit the maximum forward stroke of the operating tube 5 and to push the thrust bearing 6.

[0036] The thrust bearing 6 is sleeved on the operating tube 5 and located above the limiting part 501 (i.e., on the side away from the docking hole 101). The thrust bearing 6 is made of metal and its upper and lower end faces are smooth planes to reduce rotational friction.

[0037] Both the inner spring 7 and the outer spring 8 are sleeved on the outside of the operating tube 5, and are arranged axially on the same side of the thrust bearing 6. One end (upper end) of each of the inner spring 7 and the outer spring 8 is fixedly connected to the inner wall of the housing 1, and the other end (lower end) of each is a free end and is arranged opposite to the thrust bearing 6. In the initial state, one of the inner spring 7 and the outer spring 8 is in contact with the thrust bearing 6 and is in a pre-compressed state to apply an axial preload to the operating tube 5, so that the head of the operating tube 5 is stably in the front end position, and there is a gap between the other and the thrust bearing 6. In this embodiment, the example is that the outer spring 8 is in a pre-compressed state and in contact with the thrust bearing 6, and the inner spring 7 has a gap with the thrust bearing 6. In the initial state, the thrust bearing 6 is in contact with the free end of the outer spring 8, and a certain gap is maintained between the free end of the inner spring 7 and the thrust bearing 6.

[0038] The positioning detection component 9 includes a first position detection line and a second position detection line. The first position detection line is electrically connected to the inner spring 7, and the second position detection line is electrically connected to the outer spring 8. The positioning detection component 9 is used to detect whether the thrust bearing 6 is simultaneously in contact with the inner spring 7 and the outer spring 8, and generates a positioning signal when they are in contact. Specifically, the inner spring 7, the outer spring 8, and the thrust bearing 6 are all made of metal and have good electrical conductivity. In the initial state, since the outer spring 8 is in contact with the thrust bearing 6 while the inner spring 7 is not in contact, no electrical circuit is formed between the inner and outer springs 8. When the thrust bearing 6 is pushed upward to contact the free ends of both the inner spring 7 and the outer spring 8 simultaneously, the inner spring 7 and the outer spring 8 are electrically connected through the thrust bearing 6, and a closed loop is formed between the first position detection line and the second position detection line, thereby generating a positioning signal.

[0039] The camera positioning assembly includes a miniature camera 10, a camera cable 11, a fixing clip 13, and a driving component. In this embodiment, the driving component is a miniature electric cylinder 12. The miniature camera 10 is axially movable inside the operating tube 5. One end of the camera cable 11 is connected to the miniature camera 10, and the other end passes through the operating tube 5, the transmission cylinder 2, and the housing 1 in sequence before connecting to an external device (such as a controller). A sealed connection structure is provided between the camera cable 11 and the housing 1 to prevent gas leakage. The miniature electric cylinder 12 is fixedly installed inside the housing 1, and its output end is connected to the camera cable 11 through the fixing clip 13. It is used to drive the miniature camera 10 to move axially within the operating tube 5 by pulling the camera cable 11. When the device approaches the air nozzle 17, if a collision risk is detected with the miniature camera 10, the controller controls the miniature electric cylinder 12 to pull the camera cable 11 to move the miniature camera 10 backward, achieving anti-collision protection. When it is necessary to identify and position the air nozzle 17, the controller controls the miniature electric cylinder 12 to release the camera cable 11, allowing the miniature camera 10 to move forward to the working position under the action of gravity or spring force.

[0040] The exhaust control assembly controls the opening and closing of the exhaust passage between the inner cavity of the housing 1 and the outside. One end of the exhaust passage is connected to the cylindrical wall of the housing 1, and the other end is connected to the outside. The exhaust control assembly includes a solenoid valve 14 installed on the exhaust passage, and the opening and closing of the solenoid valve 14 is controlled by a controller. A small through-hole 502 is provided on the wall of the operating pipe 5, below the limiting part 501, to guide the gas entering the operating pipe 5 into the inner cavity of the housing 1, and then discharge it through the exhaust passage.

[0041] The air pressure sensor 15 is installed inside the housing 1 to detect the air pressure inside the housing 1 and transmit the air pressure signal to the controller in real time.

[0042] The controller is connected to the docking drive mechanism, the positioning detection component 9, the camera positioning component, the micro motor 4, the exhaust control component (solenoid valve 14), and the air pressure sensor 15 respectively. It is used to control the coordinated action of each component according to the received signal to complete the docking identification of the air nozzle 17, the valve core unscrewing, the pressure relief and exhaust, and the device reset.

[0043] See Figure 2 The working process of the device in this embodiment will be described in detail below.

[0044] (1) Air valve 17 identification and anti-collision protection stage In the initial state of the device (e.g.) Figure 1 As shown, the miniature camera 10 extends to the working position at the head of the operating tube 5. The controller controls the docking drive mechanism to move the entire device towards the air nozzle 17. The miniature camera 10 identifies and positions the air nozzle 17, transmitting the image signal to the controller. During the movement, if the controller determines that the miniature camera 10 is at risk of colliding with the air nozzle 17 based on the image recognition result, the controller controls the miniature electric cylinder 12 to actuate. The miniature electric cylinder 12 pulls the camera cable 11 to move the miniature camera 10 backward, retracting it into the operating tube 5, thus achieving anti-collision protection. Afterward, the docking drive mechanism continues to drive the device closer to the air nozzle 17.

[0045] (2) Precise docking and on-site testing stage like Figure 2As shown in (a), the device continues to advance, and the guide groove 102 guides the air nozzle 17 into the docking hole 101. As the device further tightens, the end face of the air nozzle 17 contacts the head of the operating tube 5 and pushes the operating tube 5 backward relative to the housing 1. When the operating tube 5 retracts, the limiting part 501 on it pushes the thrust bearing 6 upward. In the initial state, since the outer spring 8 is in a pre-compressed state and in contact with the thrust bearing 6, while there is a gap between the inner spring 7 and the thrust bearing 6, only the outer spring 8 is in contact with the thrust bearing 6, and no electrical circuit is formed between the inner and outer springs 8. As the thrust bearing 6 moves upward, it gradually approaches and finally contacts the free end of the inner spring 7. At this time, the inner spring 7 and the outer spring 8 are electrically connected through the metal thrust bearing 6, and a closed circuit is formed between the first position detection line and the second position detection line electrically connected to both, generating a docking signal. After receiving this signal, the controller controls the docking drive mechanism to stop axial feeding.

[0046] (3) Sealing and tightening stage When the docking signal is generated, the head of the valve core 18 is exactly in contact with the sealing rubber ring 16, forming an initial sealed space. To ensure the sealing effect, the controller can control the docking drive mechanism to move forward another 1-2 mm to further press the sealing rubber ring 16, causing it to elastically deform and form a strictly sealed space to prevent gas leakage during depressurization.

[0047] (4) Valve core unscrewing stage like Figure 2 As shown in (b), after sealing is completed, the controller starts the micro motor 4. The rotational power of the micro motor 4 is reduced and increased in torque by the reducer, and then drives the transmission cylinder 2 to rotate through the meshing of the motor gear 401 and the transmission cylinder gear 201. Since the operating tube 5 is circumferentially fixed to the transmission cylinder 2 (keyway fit), the transmission cylinder 2 drives the operating tube 5 to rotate synchronously. The concave teeth on the end face of the operating tube 5 match the groove on the head of the valve core 18. If the concave teeth are not aligned with the valve core 18 in the initial stage of rotation, the head of the operating tube 5 is continuously pressed against the valve core 18 under the preload of the outer spring 8. When the operating tube 5 rotates until the concave teeth are aligned with the valve core 18, the concave teeth automatically spring into the valve core 18 and lock in place. The operating tube 5 continues to rotate, driving the valve core 18 to rotate synchronously, loosening the valve core 18 from the valve nozzle 17 and completely unscrewing it.

[0048] (5) Depressurization and venting stage After the valve core 18 is fully unscrewed, the controller opens the solenoid valve 14, thus opening the exhaust passage. High-pressure gas inside the pressure vessel enters the operating pipe 5 through the gap created by the unscrewed valve core 18, then enters the inner cavity of the housing 1 through the small air holes 502 on the wall of the operating pipe 5, and finally exits through the exhaust passage. The airflow is as follows... Figure 2(b) is indicated by the red arrow. Throughout the depressurization process, the pressure sensor 15 monitors the pressure changes inside the housing 1 in real time and transmits the pressure signal to the controller in real time.

[0049] (6) Pressure relief completion and valve core discharge stage like Figure 2 As shown in (c), when the pressure sensor 15 detects that the pressure inside the housing 1 has dropped to a preset value by the controller, the depressurization is deemed complete. The controller controls the solenoid valve 14 to close and simultaneously controls the docking drive mechanism to move in the reverse direction, driving the entire device to retract and reset. During the retraction process, the valve core 18, which has been rotated out, is ejected forward by the elastic restoring force of the outer spring 8, disengaging from the docking hole 101, thus achieving automatic discharge of the valve core 18. The device returns to its initial state, completing one complete unloading of the valve core and depressurization of the pressure vessel, and is ready for the next cycle.

[0050] The above description is merely an example and illustration of the structure of the present invention. Those skilled in the art can make various modifications or additions to the specific embodiments described, or use similar methods to replace them, as long as they do not deviate from the inventive concept of the present invention, and all such modifications or additions should fall within the protection scope of the present invention.

Claims

1. An automatic unloading and pressure relief device for a pressure vessel valve core, characterized in that, include: The docking drive mechanism is used to drive the entire device to move so as to achieve the approach, docking and separation of the device and the air nozzle; The housing (1) is connected to the output end of the docking drive mechanism, and one end of the housing (1) is provided with a docking hole (101) for docking with the air nozzle. The transmission cylinder (2) is rotatably installed inside the housing (1); A micro motor (4) is installed inside the housing (1), and its output end is connected to the transmission cylinder (2) for driving the transmission cylinder (2) to rotate. The operating tube (5) is a hollow tube. One end of it is inserted into the transmission cylinder (2) and is circumferentially fixed to the transmission cylinder (2) and axially slidable relative to it. Its head extends to the docking hole (101) and its end face is provided with concave teeth for clamping the valve core. The operating tube (5) is provided with a limiting part (501). The thrust bearing (6) is sleeved on the operating tube (5) and located above the limiting part (501); The inner spring (7) and the outer spring (8) are both sleeved on the outside of the operating tube (5). One end of each of the inner spring (7) and the outer spring (8) is fixedly connected to the inner wall of the housing (1), and the other end of each is a free end and is arranged opposite to the thrust bearing (6). One of the inner spring (7) and the outer spring (8) is in contact with the thrust bearing (6) and is in a pre-compressed state to apply axial preload to the operating tube (5), and there is a gap between the other and the thrust bearing (6). The positioning detection component (9) is electrically connected to the inner spring (7) and the outer spring (8) respectively, and is used to detect whether the thrust bearing (6) is simultaneously in contact with the inner spring (7) and the outer spring (8), and to generate a docking positioning signal when in contact; The camera positioning component includes a miniature camera (10) and a driving component. The miniature camera (10) is movably disposed within the operating tube (5), and the driving component is used to drive the miniature camera (10) to move axially. An exhaust control assembly is used to control the opening and closing of the exhaust passage between the inner cavity of the housing (1) and the outside.

2. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 1, characterized in that, The end of the housing (1) opposite to the docking hole (101) is closed. The docking hole (101) is connected to the inner cavity of the housing (1) through a through hole. The diameter of the through hole is smaller than the diameter of the docking hole (101) to form a stepped portion. A sealing rubber ring (16) is provided at the stepped portion.

3. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 1, characterized in that, The positioning detection component (9) includes a first position detection line and a second position detection line. The first position detection line is electrically connected to the inner spring (7), and the second position detection line is electrically connected to the outer spring (8). When the limiting part (501) pushes the thrust bearing (6) to move to simultaneously contact the inner spring (7) and the outer spring (8), the inner spring (7) and the outer spring (8) are electrically connected through the metal surface of the thrust bearing (6), thereby generating the docking positioning signal.

4. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 1, characterized in that, The driving component of the camera positioning assembly is a miniature electric cylinder (12). The miniature electric cylinder (12) is fixedly installed in the housing (1). Its output end is connected to the camera line (11) of the miniature camera (10) through a fixing clip (13). It is used to drive the miniature camera (10) to move axially in the operating tube (5) by pulling the camera line (11).

5. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 1, characterized in that, The output end of the micro motor (4) is connected to the transmission cylinder (2) via a gear set. The gear set includes a motor gear (401) fixedly installed at the output end of the micro motor (4) and a transmission cylinder gear (201) fixedly installed on the transmission cylinder (2). The motor gear (401) meshes with the transmission cylinder gear (201).

6. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 1, characterized in that, On the wall of the operating tube (5), below the limiting part (501), there is a through small air hole (502) for guiding the gas entering the operating tube (5) into the inner cavity of the housing (1).

7. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 1, characterized in that, It also includes a pressure sensor (15) installed inside the housing (1) for detecting the pressure inside the housing (1).

8. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 1, characterized in that, The exhaust control assembly includes a solenoid valve (14) installed on the exhaust passage.

9. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 1, characterized in that, The outer side of the docking hole (101) is provided with a guide groove (102) for guiding the air nozzle to dock with the docking hole (101).

10. The automatic unloading and pressure relief device for pressure vessel valve core according to claim 7, characterized in that, It also includes a controller, which is connected to the docking drive mechanism, the positioning detection component (9), the camera positioning component, the micro motor (4), the exhaust control component and the air pressure sensor (15) respectively, and is used to control the coordinated action of each component according to the received signal to complete the nozzle docking identification, valve core unscrewing, pressure relief and exhaust and device reset.

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