A locking and unlocking mechanism for a low-temperature connector

Abstract

The present invention provides a locking and unlocking mechanism for a cryogenic joint. The cryogenic joint includes a socket and a plug. The socket and the plug are locked and unlocked through the locking and unlocking mechanism. The plug includes an insertion portion, and the insertion portion has a non-circular structure. A slot adapted to the insertion portion is provided on the socket. The locking and unlocking mechanism includes a cutter and a power driving mechanism, and the power driving mechanism is drivingly connected to the cutter. A non-circular hole adapted to the insertion portion is provided on the cutter. After the insertion portion passes through the non-circular hole and is inserted into the slot, the power driving mechanism drives the cutter to rotate, and the cutter can abut against the insertion portion to restrict the insertion portion from moving in the pulling-out direction.

Description

Technical Field

[0001] The present invention relates to the field of medical technology, and particularly to a locking and unlocking mechanism for a cryogenic connector. Background Art

[0002] Cryosurgery, also known as cryotherapy, refers to a clinical medicine that uses cryogenic instruments to controllably cool, freeze, and rewarm diseased tissues, causing irreversible damage and necrosis of tumor cells.

[0003] Currently, there are mainly two systems applied to cryotherapy: the liquid nitrogen system and the gas throttling system. The common point of the above two systems is that the cryoprobe in contact with the human diseased tissue must be connected to the system equipment through a connector, and currently, a mechanical threaded interface is mostly used. For the liquid nitrogen system, since the low-temperature liquid nitrogen at -190°C flows through the connection part between the equipment and the cryoprobe, the material requirements for the male and female connectors at the connection part are extremely high, and there are disadvantages such as difficulty in pulling out the connector after freezing; the gas working media generally used in the gas throttling system include argon, helium, nitrogen, mixed working media, etc. These working media have relatively high working pressures, and some are even as high as 40 MPa. Using a traditional mechanical threaded interface has potential risks such as high-pressure jet due to human negligence factors. Summary of the Invention

[0004] To solve the above problems, the present invention provides a locking and unlocking mechanism for a cryogenic connector. The cryogenic connector includes a socket and a plug, and the socket and the plug are locked and unlocked through the locking and unlocking mechanism; the plug includes an insertion part, and the insertion part has a non-circular structure; a slot adapted to the insertion part is provided on the socket.

[0005] The locking and unlocking mechanism includes a cutter and a power driving mechanism, and the power driving mechanism is drivingly connected to the cutter; a non-circular hole adapted to the insertion part is provided on the cutter; after the insertion part passes through the non-circular hole and is inserted into the slot, the power driving mechanism drives the cutter to rotate, and the cutter can abut against the insertion part to restrict the insertion part from moving in the pulling-out direction.

[0006] Preferably, a chamfer is provided at one end of the insertion part facing away from the socket, and a slope adapted to the chamfer is provided at one end of the non-circular hole facing away from the socket. When the insertion part is not inserted in place, the power driving mechanism drives the cutter to rotate, and the cutter pushes the insertion part to be inserted in place through the extrusion and sliding between the chamfer and the slope.

[0007] Preferably, the power driving mechanism includes a power mechanism and a transmission mechanism, and the power mechanism is drivingly connected to the cutter through the transmission mechanism.

[0008] Preferably, the power mechanism includes a motor; the transmission mechanism includes a gear and an arc-shaped rack. The gear is fixedly connected to the output shaft of the motor, the arc-shaped rack is fixed to the outer periphery of the cutter, and the gear meshes with the arc-shaped rack.

[0009] Preferably, for the locking and unlocking mechanism of a low-temperature joint, the mounting seat includes a bottom plate and a panel. The bottom plate is fixedly connected to the socket, and the cutter is rotatably arranged between the bottom plate and the panel.

[0010] Preferably, the cutter is rotatably arranged between the bottom plate and the panel through a bearing;

[0011] On one side of the bottom plate facing the cutter, an annular stepped boss is provided. The annular stepped boss includes a first annular boss and a second annular boss. The first annular boss is located outside the second annular boss; the outer ring of the bearing is sleeved on the second annular boss, the end face of the inner ring of the bearing abuts against the first annular boss, and the end face of the outer ring of the bearing is suspended.

[0012] On one side surface of the cutter facing the bottom plate, an annular stepped groove is provided. The annular stepped groove includes an inner groove and an outer groove. The outer groove communicates with the outer periphery of the inner groove; the bearing is embedded in the outer groove, and the end face of the outer ring of the bearing abuts against the bottom of the outer groove; the end face of the inner ring of the bearing is suspended through the inner groove.

[0013] The panel is fixedly connected to the bottom plate. The cutter is located between the panel and the bottom plate, and the panel abuts against the cutter; guide holes for guiding the insertion portion to be inserted into the slot are provided on both the bottom plate and the panel, and the guide holes communicate with the non-circular hole and the slot respectively.

[0014] Preferably, a plurality of hemispherical protrusions for axially positioning the cutter are arranged at intervals on one side surface of the panel facing the cutter, and the hemispherical protrusions abut against the cutter.

[0015] Preferably, two limit posts are also arranged at intervals on one side surface of the bottom plate facing the cutter, and the two limit posts correspond to the two ends of the arc-shaped rack respectively;

[0016] When the cutter rotates, when one end of the arc-shaped rack contacts one of the limit posts, or when the other end of the arc-shaped rack contacts the other limit post, the cutter stops rotating.

[0017] Preferably, the locking and unlocking mechanism of the low-temperature connector further comprises a first monitoring device for monitoring whether the insertion part is inserted in place. The first monitoring device includes a first magnet and a first magnetic proximity switch adapted to the first magnet. The first magnet is disposed on the insertion part, and the first magnetic proximity switch is disposed on the bottom plate.

[0018] Preferably, the locking and unlocking mechanism of the low-temperature connector further comprises a second monitoring device for monitoring the state of the cutting knife. The second monitoring device includes a second magnet, a second magnetic proximity switch and a third magnetic proximity switch adapted to the second magnet. The second magnet is disposed on the side surface of the cutting knife facing the bottom plate. The second magnetic proximity switch and the third magnetic proximity switch are spaced apart on the bottom plate. When the cutting knife rotates, when the second magnet reaches directly in front of the second magnetic proximity switch, the cutting knife is locked in place; when the second magnet reaches directly in front of the third magnetic proximity switch, the cutting knife is unlocked in place.

[0019] Preferably, both the mounting seat and the cutting knife are made of low-temperature resistant materials and have low-temperature resistant coatings on their surfaces.

[0020] Preferably, the plug includes a plug body and an insertion part integrally provided at one end of the plug body. An annular groove is provided on the outer periphery of the connection part between the insertion part and the plug body. When locked, the cutting knife contacts the end surface of the insertion part through the annular groove to resist the insertion part.

[0021] Preferably, the insertion part is oval.

[0022] Compared with the prior art, the present invention has the following technical effects:

[0023] 1. The present invention provides a locking and unlocking mechanism for a low-temperature connector. By changing the contact area between the cutting knife and the insertion part of the plug, the movement of the plug in the pulling-out direction is restricted or unrestricted, thereby realizing the quick locking and unlocking of the low-temperature connector, which is safe and reliable, and has a simple structure, a small volume and low noise.

[0024] 2. In the present invention, the insertion part of the plug is oval, which has a small volume and high space utilization rate.

[0025] 3. The present invention adopts a single cutting knife locking method, with fewer parts and a simple and reliable structure.

[0026] 4. The present invention uses a magnetic proximity switch as a position sensor, which has high precision, a small overall volume and high space utilization rate.

[0027] Of course, it is not necessary for any product implementing the present invention to achieve all the above-mentioned advantages simultaneously. Brief Description of the Drawings

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0029] Figure 1 It is a schematic structural diagram of a locking and unlocking mechanism of a low-temperature joint provided by an embodiment of the present invention (the plug is inserted into the socket);

[0030] Figure 2 It is an exploded view of a locking and unlocking mechanism of a low-temperature joint provided by an embodiment of the present invention;

[0031] Figure 3 It is a schematic structural diagram of a cutting knife in the unlocked state provided by an embodiment of the present invention;

[0032] Figure 4 It is a schematic structural diagram of a cutting knife in the locked state provided by an embodiment of the present invention;

[0033] Figure 5 It is a schematic structural diagram of a plug provided by an embodiment of the present invention;

[0034] Figure 6 It is a schematic structural diagram of a cutting knife provided by an embodiment of the present invention;

[0035] Figure 7 It is a schematic structural diagram of a bottom plate provided by an embodiment of the present invention;

[0036] Figure 8 It is a schematic structural diagram of a panel provided by an embodiment of the present invention;

[0037] Figure 9 It is a schematic structural diagram of a limiting post limiting one end of an annular rack provided by an embodiment of the present invention;

[0038] Figure 10 It is a schematic structural diagram of another limiting post limiting the other end of the annular rack provided by an embodiment of the present invention;

[0039] Figure 11 It is a schematic structural diagram of the locking and unlocking mechanism locked in place provided by an embodiment of the present invention;

[0040] Figure 12 It is a schematic structural diagram of the locking and unlocking mechanism unlocked in place provided by an embodiment of the present invention;

[0041] Figure 13It is a schematic structural diagram of a locking and unlocking mechanism provided by an embodiment of the present invention for performing feed compensation on a plug when the plug is inserted in place;

[0042] Figure 14 It is a cross-sectional view of a locking and unlocking mechanism provided by an embodiment of the present invention for performing feed compensation on a plug when the plug is inserted in place. Detailed implementation manners

[0043] 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.

[0044] Next, the technical solutions of the present invention will be described in detail with specific embodiments. These specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments.

[0045] Please refer to Figures 1 to 13 , a locking and unlocking mechanism for a cryogenic joint. The cryogenic joint includes a socket 3 and a plug 1, and the socket 3 and the plug 1 are locked and unlocked through the locking and unlocking mechanism 2. The plug 1 includes an insertion portion 11, and the insertion portion 11 is a non-circular structure, that is, it is not necessary for the insertion portion 11 to be circular, such as an oval, a rectangle, a regular polygon or an irregular image, etc. In this embodiment, the insertion portion 11 is preferably an oval. A slot 31 adapted to the insertion portion 11 is provided on the socket 3. In this embodiment, the shape of the slot 31 is the same as the shape of the insertion portion 11, and the slot 31 is slightly larger than the insertion portion 11. When docking, the insertion portion 11 is inserted into the slot 31.

[0046] The locking and unlocking mechanism 2 includes a cutter 203 and a power driving mechanism, and the power driving mechanism is drivingly connected to the cutter 203. A non-circular hole 2031 adapted to the insertion portion 11 is provided on the cutter 203; during docking, the insertion portion 11 passes through the non-circular hole 2031 and inserts into the slot 31, the power driving mechanism drives the cutter 203 to rotate, and the cutter 203 abuts against the insertion portion 11 to restrict the insertion portion 11 from moving in the pulling-out direction. When the insertion portion 11 is inserted into the slot 31, one end face of the insertion portion 11 is located inside the slot 31 and the other end face is located outside the slot 31. This end face contacts the cutter 203 to achieve the purpose of the cutter 203 abutting against the insertion portion 11. Since neither the insertion portion 11 nor the non-circular hole 2031 on the cutter 203 is a circular structure, when the cutter 203 rotates, the insertion portion 11 will intersect with the non-circular hole 2031 of the cutter 203, that is, the end face of the cutter 203 will contact the end face of the insertion portion 11. The cutter 203 restricts the insertion portion 11 from moving in the pulling-out direction, and the insertion portion 11 cannot disengage from the non-circular hole 2031 of the cutter 203 along the pulling-out direction. Furthermore, the insertion portion 11 cannot disengage from the slot 31 of the socket 3, achieving the purpose of the cutter 203 locking the plug 1. At this time, the locking and unlocking mechanism 2 is in the locked state. Please refer to Figure 4 and Figure 11 . When it is necessary to unlock the plug 1, the power driving mechanism drives the cutter 203 to rotate, and the cutter 203 no longer contacts the insertion portion 11. Then, the cutter 203 no longer restricts the insertion portion 11 from moving in the pulling-out direction, that is, the restriction on the insertion portion 11 moving in the pulling-out direction is released. At this time, the locking and unlocking mechanism 2 is in the unlocked state. Please refer to Figure 3 and Figure 12 , and the plug 1 can be pulled out from the socket 3.

[0047] In this embodiment, the plug 1 includes a plug body 13 and an insertion portion 11 integrally provided at one end of the plug body 13. An annular groove 12 is provided on the outer periphery of the connection portion between the insertion portion 11 and the plug body 13. During locking, the cutter 203 contacts the end face of the insertion portion 11 facing the plug body 13 through the annular groove 12 to abut against the insertion portion 11, achieving the purpose of the cutter 203 locking the insertion portion 11. In this embodiment, the plug body 13 and the insertion portion 11 are integrally formed, and the shape and size of the plug body 13 are the same as those of the insertion portion 11.

[0048] The power driving mechanism can adopt a driving mode of directly driving the cutter 203 with power, or can also adopt a driving mode of driving the cutter 203 through transmission. The present invention does not limit this. Taking the latter as an example in this embodiment, as the power driving mechanism includes a power mechanism and a transmission mechanism, the power mechanism is drivingly connected to the cutter 203 through the transmission mechanism. The power mechanism can be a power device such as an electric device, a pneumatic device or an oil cylinder, and the transmission mechanism can be a belt transmission, a gear transmission, a chain transmission, a worm and worm gear transmission or a screw transmission, etc. The present invention does not make specific limitations on this. In this embodiment, the power mechanism includes a motor 208; the transmission mechanism includes a gear 207 and an arc-shaped rack 214, and the gear 207 is fixedly connected to the output shaft of the motor 208. The cutter 203 is of a disc-shaped structure, the arc-shaped rack 214 is fixed on the outer periphery of the cutter 203, and the gear 207 meshes with the arc-shaped rack 214. In this embodiment, the arc-shaped rack 214 and the gear 207 are externally meshed. Therefore, the rotation direction of the gear 207 is the same as the rotation direction of the motor 208, and the rotation direction of the arc-shaped rack 214 is opposite to the rotation direction of the motor 208. Therefore, the rotation direction of the cutter 203 is opposite to the rotation direction of the motor 208.

[0049] In this embodiment, the cutter 203 is of a disc structure, the arc-shaped rack 214 is integrally formed on the outer periphery of the cutter 203, and the arc-shaped rack 214 and the cutter 203 are concentric circles.

[0050] For the convenience of the installation of the cutter 203 and the power driving mechanism, the locking and unlocking mechanism 2 further includes a mounting seat, the mounting seat is fixed on the socket 3, the cutter 203 is rotatably arranged on the mounting seat, and the power mechanism is mounted on the mounting seat.

[0051] In this embodiment, the mounting seat includes a bottom plate 211 and a panel 202, the bottom plate 211 is fixedly connected to the socket 3, and the cutter 203 is rotatably connected to the bottom plate 211 through a bearing 213:

[0052] Please refer to Figure 7 , a ring-shaped stepped boss 2113 is arranged on one side of the bottom plate 211 facing the cutter 203. The ring-shaped stepped boss 2113 includes a first ring boss 21132 and a second ring boss 21131, and the first ring boss 21132 is located outside the second ring boss 21131; the bearing 213 is sleeved on the second ring boss 21131, the inner ring end face of the bearing 213 abuts against the first ring boss 21132, and the outer ring end face of the bearing 213 is suspended. The purpose is to ensure that the outer ring end face of the bearing 213 will not directly contact the bottom plate 211 and cause jamming.

[0053] The bottom plate 211 is provided with a first guide hole 2112 for guiding the insertion portion 11 to be inserted into the slot 31, and the first guide hole 2112 penetrates through the second circular ring boss 21131.

[0054] On one side of the cutting knife 203 facing the bottom plate 211, there is an annular stepped groove 2032. Please refer to Figure 6 , the annular stepped groove 2032 includes an inner groove 20321 and an outer groove 20322, and the outer groove 20322 communicates with the outer periphery of the inner groove 20321. The bearing 213 is embedded in the outer groove 20322, and the outer ring end face of the bearing 213 abuts against the bottom of the outer groove 20322; the inner ring end face of the bearing 213 is suspended through the inner groove 20321, so that when one end of the bearing 213 is inserted into the cutting knife 203, the inner ring of the bearing 213 will not directly contact the cutting knife 203 and cause jamming.

[0055] The panel 202 is fixedly connected to the bottom plate 211, such as by screw studs 205 and other threaded fasteners, or by other fasteners. The cutting knife 203 is located between the panel 202 and the bottom plate 211, and the panel 202 abuts against the cutting knife 203.

[0056] Please refer to Figure 8 , the panel 202 is provided with second guide holes 2021 for guiding the insertion portion 11 to be inserted into the slot 31. The slot 31 on the socket 3, the first guide hole 2112 on the bottom plate 211, the non-circular hole 2031 on the cutting knife 203, and the second guide hole 2021 on the panel 202 are all elliptical holes with the same shape and equal size adapted to the insertion portion 11. The slot 31 on the socket 3, the first guide hole 2112 on the bottom plate 211, the non-circular hole 2031 on the cutting knife 203, and the second guide hole 2021 on the panel 202 are sequentially communicated to form a channel for the insertion portion 11 to move.

[0057] On one side of the panel 202 facing the cutting knife 203, a plurality of hemispherical protrusions 2022 for axially positioning the cutting knife 203 are arranged at intervals. The circular bottom surface of the hemispherical protrusion 2022 is fixedly connected to the panel 202, and the spherical surface of the hemispherical protrusion 2022 abuts against the cutting knife 203. In this embodiment, a plurality of hemispherical protrusions 2022 are arranged at intervals around the outer periphery of the second guide hole 2021, and the contact area between the hemispherical protrusion 2022 and the cutting knife 203 is small, and the friction is small.

[0058] In order to prevent the motor 208 from rotating excessively, therefore, two limit posts are also arranged at intervals on one side of the bottom plate 211 facing the cutting knife 203, and the two limit posts respectively correspond to both ends of the arc-shaped rack 214. When the cutting knife 203 rotates, please refer to Figure 9, when one end of the arc-shaped rack 214 contacts one of the limit posts 212, or when the other end of the arc-shaped rack 214 contacts the other limit post 212', please refer to Figure 10 , the cutting tool 203 stops rotating. That is, these two limit posts limit the bidirectional rotation limit positions of the cutting tool 203 by contacting both ends of the arc-shaped rack 214 on the cutting tool 203.

[0059] In this embodiment, the bottom plate 211, the panel 202, and the cutting tool 203 are all made of low-temperature resistant materials and have a low-temperature resistant coating on their surfaces, aiming to prevent adhesion, waterproof, prevent condensation, or prevent icing during cold leakage or heat conduction.

[0060] In this embodiment, in order to monitor whether the insertion part 11 is inserted in place (that is, whether the insertion part 11 is inserted into the slot 31 of the socket 3 at a specified position), the locking and unlocking mechanism 2 further includes a first monitoring device for monitoring whether the insertion part 11 is inserted in place. The first monitoring device includes a first magnet 201 and a first magnetic proximity switch 209 adapted to the first magnet 201. The first magnet 201 is arranged on the insertion part 11, and the first magnetic proximity switch 209 is arranged on the bottom plate 211. When the first magnet 201 reaches directly in front of the first magnetic proximity switch 209, the insertion part 11 is inserted in place; otherwise, the insertion part 11 is not inserted in place.

[0061] The locking and unlocking mechanism 2 further includes a second monitoring device for monitoring the state of the cutting tool 203. The second monitoring device includes a second magnet 204, a second magnetic proximity switch 206, and a third magnetic proximity switch 210 adapted to the second magnet 204. The second magnet 204 is arranged on the side surface of the cutting tool 203 facing the bottom plate 211. Further, the second magnet 204 is located on the side surface of the arc-shaped rack 214. The second magnetic proximity switch 206 and the third magnetic proximity switch 210 are arranged on the bottom plate 211 at intervals. When the cutting tool 203 rotates, when the second magnet 204 reaches directly in front of the second magnetic proximity switch 206, the cutting tool 203 is locked in place, please refer to Figure 11 ; when the second magnet 204 reaches directly in front of the third magnetic proximity switch 210, the cutting tool 203 is unlocked in place, please refer to Figure 12 .

[0062] The working principle of the locking and unlocking mechanism 2 of the low-temperature connector provided in this embodiment:

[0063] After the plug 1 is inserted into the socket 3 (that is, the insertion part 11 is inserted into the slot 31 of the socket 3), the first magnet 201 is located directly in front of the first magnetic proximity switch 209. At this time, the state of being inserted in place is recognized according to the acquired magnetic signal.

[0064] After being inserted in place, the motor 208 performs the locking action as Figure 11 shown, that is, the motor 208 rotates forward as shown in the figure, the gear 207 drives the arc rack 214 on the cutter 203 to rotate in reverse. After the second magnet 204 approaches and reaches directly in front of the second magnetic proximity switch 206, the locking-in-place state is identified according to the magnetic signal obtained at this time. At this time, the position of the cutter 203 is as Figure 4 shown.

[0065] After the unlocking instruction is issued by the upper computer inside the refrigeration system, the motor 208 performs the unlocking action as Figure 12 shown, that is, the motor 208 rotates in reverse, the gear 207 drives the arc rack 214 on the cutter 203 to rotate forward. After the second magnet 204 approaches and reaches directly in front of the third magnetic proximity switch 210, the unlocking-in-place state is identified according to the magnetic signal obtained at this time. At this time, the position of the cutter 203 is as Figure 3 shown.

[0066] In the prior art, the locking operation can be completed only when the plug is inserted in place. Also, because this operation is uncontrollable by humans, it is impossible to ensure that it is inserted in place every time. Therefore, when the plug is not inserted in place, the following embodiments can be used to compensate for the feed and assist it to be in place.

[0067] Please refer to Figure 13 . In this embodiment, a chamfer 111 is provided on one end face of the insertion part 11 facing away from the socket 3. The chamfer 111 is formed by cutting the edge of the end of the insertion part 11 into a certain inclined plane. A slope 20311 adapted to the chamfer 111 is provided at one end of the non-circular hole 2031 of the cutter 203 facing away from the socket 3, that is, the inclination angles of the chamfer 111 and the slope 20311 are the same. When the insertion part 11 is not inserted in place but the first magnetic proximity switch 209 is still triggered, the locking action is still performed, and the power driving mechanism drives the cutter 203 to rotate. At this time, because it is not inserted in place, the chamfer 111 on the insertion part 11 contacts the slope 20311 on the cutter 203. After contact, due to the rotation of the cutter 203 and the non-circular hole 2031 of the cutter 203 being an elliptical shape with a variable diameter, the distance A between the contact points of the non-circular hole 2031 of the cutter 203 and the insertion part 11 will become smaller as the cutter 203 rotates during the locking process. Please refer to Figure 14 . Thus, through the extrusion and sliding between the chamfer 111 and the slope 20311, the insertion part 11 is driven to be inserted in place.

[0068] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A locking and unlocking mechanism for a cryogenic joint, the cryogenic joint comprising a socket and a plug, and the socket and the plug being locked and unlocked through the locking and unlocking mechanism; Characterized in that, the plug includes an insertion portion, and the insertion portion is a non-circular structure; a slot adapted to the insertion portion is provided on the socket; the locking and unlocking mechanism includes a cutter and a power driving mechanism, and the power driving mechanism is drivingly connected to the cutter; a non-circular hole adapted to the insertion portion is provided on the cutter; after the insertion portion passes through the non-circular hole and is inserted into the slot, the power driving mechanism drives the cutter to rotate, and the cutter can abut against the insertion portion to restrict the insertion portion from moving in the pulling-out direction; a chamfer is provided at one end of the insertion portion facing away from the socket, and a slope adapted to the chamfer is provided at one end of the non-circular hole facing away from the socket. When the insertion portion is not inserted in place, the power driving mechanism drives the cutter to rotate, and the cutter pushes the insertion portion to be inserted in place through the extrusion and sliding between the chamfer and the slope.

2. A locking and unlocking mechanism for a cryogenic joint according to claim 1, Characterized in that, the power driving mechanism includes a power mechanism and a transmission mechanism, and the power mechanism is drivingly connected to the cutter through the transmission mechanism.

3. A locking and unlocking mechanism for a cryogenic joint according to claim 2, Characterized in that, the power mechanism includes a motor; the transmission mechanism includes a gear and an arc-shaped rack, the gear is fixedly connected to the output shaft of the motor, the arc-shaped rack is fixed on the outer periphery of the cutter, and the gear meshes with the arc-shaped rack.

4. A locking and unlocking mechanism for a cryogenic joint according to claim 3, Characterized in that, it further includes a mounting seat, the mounting seat includes a bottom plate and a panel, the bottom plate is fixedly connected to the socket, and the cutter is rotatably arranged between the bottom plate and the panel.

5. A locking and unlocking mechanism for a cryogenic joint according to claim 4, Characterized in that, the cutter is rotatably arranged between the bottom plate and the panel through a bearing; a ring-shaped stepped boss is provided on one side of the bottom plate facing the cutter, the ring-shaped stepped boss includes a first ring boss and a second ring boss, and the first ring boss is located outside the second ring boss; the bearing is sleeved on the second ring boss, the inner ring end face of the bearing abuts against the first ring boss, and the outer ring end face of the bearing is suspended; a ring-shaped stepped groove is provided on one side of the cutter facing the bottom plate, the ring-shaped stepped groove includes an inner groove and an outer groove, and the outer groove communicates with the outer periphery of the inner groove; the bearing is embedded in the outer groove, and the outer ring end face of the bearing abuts against the bottom of the outer groove; the inner ring end face of the bearing is suspended through the inner groove; the panel is fixedly connected to the bottom plate, the cutter is located between the panel and the bottom plate, and the panel abuts against the cutter; guide holes for guiding the insertion portion to be inserted into the slot are provided on both the bottom plate and the panel, and the guide holes communicate with the non-circular hole and the slot respectively.

6. The locking and unlocking mechanism of a low-temperature joint according to claim 5, characterized in that, a plurality of hemispherical protrusions for axially positioning the cutter are arranged at intervals on the side surface of the panel facing the cutter, and the hemispherical protrusions abut against the cutter.

7. The locking and unlocking mechanism of a low-temperature joint according to claim 4, characterized in that, two limit posts are further arranged at intervals on the side surface of the bottom plate facing the cutter, and the two limit posts respectively correspond to the two ends of the arc-shaped rack; when the cutter rotates, when one end of the arc-shaped rack contacts one of the limit posts, or when the other end of the arc-shaped rack contacts the other limit post, the cutter stops rotating.

8. The locking and unlocking mechanism of a low-temperature joint according to claim 4, characterized in that, it further includes a first monitoring device for monitoring whether the insertion part is inserted in place. The first monitoring device includes a first magnet and a first magnetic proximity switch adapted to the first magnet. The first magnet is arranged on the insertion part, and the first magnetic proximity switch is arranged on the bottom plate.

9. The locking and unlocking mechanism of a low-temperature joint according to claim 4, characterized in that, it further includes a second monitoring device for monitoring the state of the cutter. The second monitoring device includes a second magnet, a second magnetic proximity switch and a third magnetic proximity switch adapted to the second magnet. The second magnet is arranged on the side surface of the cutter facing the bottom plate, the second magnetic proximity switch and the third magnetic proximity switch are arranged at intervals on the bottom plate. When the cutter rotates, when the second magnet reaches directly in front of the second magnetic proximity switch, the cutter is locked in place; when the second magnet reaches directly in front of the third magnetic proximity switch, the cutter is unlocked in place.

10. The locking and unlocking mechanism of a low-temperature joint according to claim 4, characterized in that, both the mounting seat and the cutter are made of low-temperature resistant materials and have low-temperature resistant coatings on their surfaces.

11. The locking and unlocking mechanism of a low-temperature joint according to claim 1, characterized in that, the plug includes a plug body and an insertion part integrally arranged at one end of the plug body. An annular groove is provided on the outer periphery of the connection part of the insertion part and the plug body. When locked, the cutter contacts the end face of the insertion part through the annular groove to abut against the insertion part.

12. The locking and unlocking mechanism of a low-temperature joint according to claim 1, characterized in that, the insertion part is oval.

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