Self-locking low residual liquid connector

Abstract

The application discloses a self-locking low-residual-liquid joint, which comprises a joint body and a male joint, the inside of the joint body is provided with a plunger, the outside of the plunger is provided with a locking sleeve, the surface of the locking sleeve is provided with a guide groove, the side of the plunger is provided with a guide column, and the side of the joint body is provided with a hand wheel. The self-locking low-residual-liquid joint is characterized in that the inside of the joint body is additionally provided with the plunger, the locking sleeve is provided with the guide groove and the guide column, the locking sleeve is pulled backward by hand, the locking sleeve moves backward along the guide groove, the limiting block on the locking sleeve is just moved into the limiting groove of the hand wheel, the joint is aligned with the male joint on the tank car at this time, the locking sleeve is loosened, the locking sleeve is reset under the action of the spring force, the steel ball in the locking sleeve is just clamped on the male joint, the butt joint of the joint and the male joint is completed, the joint satisfies the self-locking anti-dropping function required by the relevant standards, the loading safety is ensured, the operation is simple, the work efficiency is improved, and the medium waste and the environmental pollution are reduced.

Description

Technical Field

[0001] This invention belongs to the field of chemical media loading technology, and particularly relates to a self-locking low residual liquid connector. Background Technology

[0002] Loading of chemical media and petroleum products is done using loading arms. Both the loading arms and the tank trucks are equipped with ordinary quick couplings, which are female and male. The female coupling is installed on the loading arm, and the male coupling is on the tank truck.

[0003] Currently available quick couplings have the following problems when used: Traditional quick couplings lock the handle after the two connectors are joined. Over time, the handle may loosen or even come undone, causing the two connectors to detach, resulting in media leakage, safety hazards, and environmental pollution. In addition, after loading, the ball valves of the loading arm and tanker truck are closed, but there is still a considerable amount of residual media in the quick coupling from the front end of the ball valve. This must be drained, resulting in waste, environmental pollution, and safety risks. Furthermore, the coupling structure is complex and the operation is cumbersome. This coupling adopts a brand-new structure and simple operation, greatly improving work efficiency. Summary of the Invention

[0004] The purpose of this invention is to provide a self-locking low residual liquid connector to solve the technical problems mentioned in the background art.

[0005] To achieve the above objectives, the specific technical solution of the present invention is as follows: A self-locking low residual liquid connector includes a connector body and a male connector. The connector body has a plunger inside, and a locking sleeve is sleeved on the outside of the plunger. A guide groove is formed on the surface of the locking sleeve. A guide post is formed on the side of the plunger. A handwheel is formed on the side of the connector body. A limiting block is fixedly connected to the side of the locking sleeve. A limiting groove is formed on the surface of the handwheel. A positioning pin is formed on the surface of the handwheel. A gear is formed inside the connector body. A steel ball is formed inside the locking sleeve.

[0006] Preferably, a first fixing ring is sleeved on the connector body, and a second fixing ring is sleeved on the outside of the connector body. The first and second fixing rings are provided with connecting plates on their sides. There are two first fixing rings and two second fixing rings. A first square plate is fixedly connected to the side of the first fixing ring, and a second square plate is fixedly connected to the side of the second fixing ring.

[0007] Preferably, a rubber plate is provided on the side of the limiting groove, an adhesive plate is provided on the side of the rubber plate, an installation plate is fixedly connected to the side of the rubber plate, a fixing groove is opened on the surface of the installation plate, a sliding groove is opened at one end of the fixing groove, and a fixing rod is fixedly connected to the side of the handwheel. There are four fixing rods, and the fixing rods are inserted into the fixing groove.

[0008] Preferably, a threaded rod is fixedly connected to the surface of the first square plate, the threaded rod is inserted inside the second square plate, and an internal threaded seat is sleeved on the outside of the threaded rod.

[0009] Preferably, a turntable is fixedly connected to the surface of the internal thread seat, and the number of the turntables is two.

[0010] Preferably, the first fixing ring and the second fixing ring are provided with adhesive rings on their sides, and the adhesive rings are symmetrically distributed.

[0011] Preferably, the rubber plate is fixedly connected to the side of the insert rod, and the limiting groove has an insertion hole on its side, into which the insert rod is inserted.

[0012] Preferably, one end of the fixing rod is fixedly connected to a baffle, and the number of baffles is four.

[0013] The self-locking low residual liquid connector of the present invention has the following advantages:

[0014] 1. This self-locking low residual liquid connector features a plunger inside the connector body, a locking sleeve fitted around the plunger, a guide groove on the surface of the locking sleeve, a guide post on the side of the plunger, a handwheel on the side of the connector body, a limiting block on the side of the locking sleeve, a limiting groove on the surface of the handwheel, a positioning pin on the surface of the handwheel, a gear inside the connector body, and a steel ball inside the locking sleeve. When using the connector, the locking sleeve has a guide groove and a guide post. Pulling the locking sleeve backward by hand causes it to move backward along the guide groove, and the limiting block on the locking sleeve moves into the limiting groove of the handwheel. At this point, the connector is ready to be connected. Align the quick connector with the male connector on the tank truck, loosen the locking sleeve, and the locking sleeve will reset under the spring force. The steel ball inside the locking sleeve will then lock onto the male connector, thus completing the connection between the quick connector and the male connector. At this point, turn the handwheel counterclockwise to rotate the internal gears of the valve body. The rack will then move the sealing valve disc backward, opening the valve disc and allowing unobstructed flow inside the connector. When the handwheel reaches the positioning pin hole, the positioning pin will automatically fall into the positioning hole, preventing the handwheel from rotating. Since the handwheel has only one limit groove, and the limit block on the locking sleeve can only move backward into the limit groove when the handwheel is in the reset position, the handwheel cannot rotate after the positioning pin falls into the positioning hole. Under the action of the limit block, the locking sleeve cannot be pulled backward, thus achieving the self-locking and anti-detachment function of the entire connector. This ensures safe and reliable operation when using loading arms for loading. After loading is complete, repeat the above steps to unlock the connector. The plunger at the front of the valve body moves forward under the drive of the rack, sealing the valve disc against the connector end, preventing the medium from flowing out. The plunger pushes excess medium back into the tank truck's male inlet, ensuring no excessive residual medium at the pipe joint, avoiding waste and reducing environmental pollution, while also increasing safety. The entire operation is simple and clear, improving work efficiency and ensuring safety. The gear and rack transmission mechanism includes a return spring. From the working state to the reset state, the spring force allows for rapid reset, while the valve disc and end face completely seal, achieving a self-sealing function. This connector meets the self-locking and anti-detachment function requirements of relevant standards, ensuring loading safety, simplifying operation, improving work efficiency, and reducing medium waste and environmental pollution.

[0015] 2. This self-locking low residual liquid connector features a first fixing ring fitted over the connector body, a second fixing ring fitted over the connector body, and connecting plates added to the sides of the first and second fixing rings. A first square plate is installed on the side of the first fixing ring, and a second square plate is installed on the side of the second fixing ring. When the connector body needs to be installed on an loading arm, the first and second fixing rings are fitted over the connector body and the loading arm. The first and second fixing rings are then fixed by the first and second square plates. The connecting plates enhance the connection between the connector body and the loading arm, making the connection more stable.

[0016] 3. This self-locking low residual liquid connector features a rubber plate, an adhesive plate, and an installation plate on the side of the limiting groove. A fixing groove is formed on the surface of the installation plate, and a sliding groove is formed at one end of the fixing groove. A fixing rod is installed on the side of the handwheel. Before using the connector, the adhesive plate and rubber plate are installed on the side of the limiting groove. The fixing rod is then directly engaged with the fixing groove through the sliding groove. The adhesive plate is then fixed to the surface of the limiting groove by the rubber plate. When the limiting block is engaged with the limiting groove, it is directly bonded by the adhesive plate, preventing the limiting block from loosening and coming out of the limiting groove, thus making it more stable. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 This is a schematic diagram of the handwheel structure of the present invention;

[0020] Figure 3 This is a schematic diagram of the internal thread seat structure of the present invention;

[0021] Figure 4 This is a schematic diagram of the adhesive plate structure of the present invention;

[0022] Figure 5 This is a schematic diagram of the limiting groove structure of the present invention;

[0023] Figure 6 For the present invention Figure 3 Enlarged view of section A in the middle.

[0024] The markings in the diagram are as follows: 1. Connector body; 2. Guide post; 3. Locking sleeve; 4. Handwheel; 5. Positioning pin; 6. Limiting block; 7. Guide groove; 8. Male connector; 9. First fixing ring; 10. Second fixing ring; 11. First square plate; 12. Second square plate; 13. Adhesive ring; 14. Connecting plate; 15. Threaded rod; 16. Turntable; 17. Internal thread seat; 18. Mounting plate; 19. Insert rod; 20. Rubber plate; 21. Adhesive plate; 22. Fixing groove; 23. Sliding groove; 24. Gear; 25. Limiting groove; 26. Fixing rod; 27. Insertion hole; 28. Baffle; 29. ​​Steel ball; 30. Plunger. Detailed Implementation

[0025] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the embodiments of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0026] In the description of the embodiments of the present invention, it should be understood that the terms "length", "vertical", "horizontal", "top", "bottom", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention.

[0027] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of the present invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0028] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0029] The following disclosure provides many different implementations or examples for carrying out different structures of the embodiments of the present invention. To simplify the disclosure of the embodiments of the present invention, specific examples of components and arrangements are described below. Of course, these are merely examples and are not intended to limit the embodiments of the present invention. Furthermore, reference numerals and / or reference letters may be repeated in different examples of the embodiments of the present invention; such repetition is for simplification and clarity and does not in itself indicate a relationship between the various implementations and / or arrangements discussed.

[0030] To better understand the purpose, structure, and function of this invention, a self-locking low residual liquid connector of this invention will be described in further detail below with reference to the accompanying drawings.

[0031] like Figure 1-6As shown, a self-locking low residual liquid connector of the present invention includes a connector body 1 and a male connector 8. A plunger 30 is provided inside the connector body 1, and a locking sleeve 3 is sleeved on the outside of the plunger 30. A guide groove 7 is formed on the surface of the locking sleeve 3, and a guide post 2 is provided on the side of the plunger 30. A handwheel 4 is provided on the side of the connector body 1, and a limiting block 6 is fixedly connected to the side of the locking sleeve 3. A limiting groove 25 is formed on the surface of the handwheel 4, and a positioning pin 5 is provided on the surface of the handwheel 4. A gear 24 is provided inside the connector body 1, and a steel ball 29 is provided inside the locking sleeve 3. The invention achieves this by adding a plunger 30 inside the connector body 1, a locking sleeve 3 sleeved on the outside of the plunger 30, a guide groove 7 on the surface of the locking sleeve 3, a guide post 2 on the side of the plunger 30, a handwheel 4 on the side of the connector body 1, a limiting block 6 installed on the side of the locking sleeve 3, a limiting groove 25 on the surface of the handwheel 4, a positioning pin 5 on the surface of the handwheel 4, a gear 24 inside the connector body 1, and a steel ball 29 inside the locking sleeve 3. 9. When using this connector, the locking sleeve 3 has a guide groove 7 and a guide post 2. Pull the locking sleeve 3 backward by hand. The locking sleeve 3 moves backward along the guide groove 7. The limiting block 6 on the locking sleeve 3 moves into the limiting groove 25 of the handwheel 4. At this time, align the connector with the male connector 8 on the tank truck and release the locking sleeve 3. The locking sleeve 3 resets under the action of the spring force. The steel ball 29 inside the locking sleeve 3 is stuck on the male connector 8. This completes the connection between the quick connector and the male connector 8. At this time, turn the handwheel 4 counterclockwise to drive the internal gear 24 of the valve body to rotate. The rack drives the sealing valve disc to move backward. At this time, the valve disc opens and the inside of the connector is unobstructed. When the handwheel 4 is rotated to the position of the positioning pin 5 hole, the positioning pin 5 automatically falls into the positioning hole. At this time, the handwheel 4 cannot be rotated. Since there is only one limiting groove 25 on the handwheel 4, and the limiting block 6 on the locking sleeve 3 can only move backward into the limiting groove 25 of the handwheel 4 when the handwheel 4 is in the reset state. When the handwheel 4 and positioning pin 5 fall into the positioning hole, the handwheel 4 cannot rotate. At this time, under the action of the limit block 6, the locking sleeve 3 cannot be pulled backward, thus realizing the self-locking and anti-dislodgement function of the entire connector. It can work safely and reliably when using loading arms. After the loading work is completed, the above steps are reversed to unlock it. The plunger 30 at the front end of the valve body moves forward under the drive of the rack, the valve disc seals with the end of the connector, and the medium inside cannot flow out. The plunger 30 at the front end pushes the excess medium back into the male interface of the tank truck, thus ensuring that there is no excessive residual medium at the pipeline interface, avoiding waste and reducing environmental pollution, while increasing safety. The whole operation process is simple and clear, improving work efficiency and ensuring safety. The transmission mechanism of the aforementioned gear 24 rack is equipped with a return spring. From the working state to the reset state, it can quickly reset under the action of the return spring force. At the same time, the valve disc and the end face can be completely sealed, realizing the self-sealing function of the joint. This joint meets the self-locking and anti-detachment function required by relevant standards, ensuring loading safety, simple operation, improving work efficiency, and reducing media waste and environmental pollution.

[0032] The connector body 1 is fitted with a first fixing ring 9, and a second fixing ring 10 is fitted onto the outside of the connector body 1. Connecting plates 14 are provided on the sides of the first fixing ring 9 and the second fixing ring 10. There are two first fixing rings 9 and two second fixing rings 10. A first square plate 11 is fixedly connected to the side of the first fixing ring 9, and a second square plate 12 is fixedly connected to the side of the second fixing ring 10. By fitting the first fixing ring 9 onto the outside of the connector body 1, fitting the second fixing ring 10 onto the outside of the connector body 1, and adding connecting plates 14 to the sides of the first fixing ring 9 and the second fixing ring 10, the connector body 1 can be installed on the loading arm. When it is necessary to install the connector body 1 on the loading arm, the first fixing ring 9 and the second fixing ring 10 are fitted onto the outside of the connector body 1 and the loading arm. At this time, the first fixing ring 9 and the second fixing ring 10 are fixed by the first square plate 11 and the second square plate 12. The connecting plates 14 enhance the connection between the connector body 1 and the loading arm, making the connection more stable.

[0033] A rubber plate 20 is provided on the side of the limiting groove 25, and an adhesive plate 21 is provided on the side of the rubber plate 20. An installation plate 18 is fixedly connected to the side of the rubber plate 20. A fixing groove 22 is opened on the surface of the installation plate 18, and a sliding groove 23 is opened at one end of the fixing groove 22. A fixing rod 26 is fixedly connected to the side of the handwheel 4. There are four fixing rods 26, which are inserted into the fixing groove 22. By adding a rubber plate 20 and an adhesive plate 21 to the side of the limiting groove 25, and an installation plate 18 to the side of the rubber plate 20, the fixing groove is provided on the surface of the installation plate 18. 22. A sliding groove 23 is opened at one end of the fixed groove 22. A fixing rod 26 is installed on the side of the handwheel 4. Before using the connector, the adhesive plate 21 and the rubber plate 20 are installed on the side of the limiting groove 25. The fixing rod 26 is directly snapped into the inside of the fixed groove 22 through the sliding groove 23. At this time, the adhesive plate 21 can be fixed to the surface of the limiting groove 25 through the rubber plate 20. When the limiting block 6 is snapped into the inside of the limiting groove 25, it is directly glued by the adhesive plate 21. At this time, it can prevent the limiting block 6 from loosening and coming out of the inside of the limiting groove 25, making it more stable.

[0034] A threaded rod 15 is fixedly connected to the surface of the first square plate 11. The threaded rod 15 is inserted inside the second square plate 12. An internal threaded seat 17 is sleeved on the outside of the threaded rod 15. By fixing the threaded rod 15 to the surface of the first square plate 11 and sleeved the internal threaded seat 17 on the outside of the threaded rod 15, inserting the threaded rod 15 into the second square plate 12, and rotating the internal threaded seat 17 to tighten the threaded rod 15, the first fixing ring 9 and the second fixing ring 10 can be fixed to the outside of the connector body 1.

[0035] The internal thread seat 17 is fixedly connected to a turntable 16. There are two turntables 16. By mounting the turntables 16 on the surface of the internal thread seat 17, the internal thread seat 17 can be easily rotated by holding the turntables 16.

[0036] The first fixing ring 9 and the second fixing ring 10 are provided with adhesive rings 13 on their sides. The adhesive rings 13 are symmetrically distributed. By installing adhesive rings 13 on the sides of the first fixing ring 9 and the second fixing ring 10, the first fixing ring 9 and the second fixing ring 10 can be easily initially fixed to the connector body 1.

[0037] A rod 19 is fixedly connected to the side of the rubber plate 20. An insertion hole 27 is opened on the side of the limiting groove 25. The rod 19 is inserted into the insertion hole 27. By installing the rod 19 on the side of the rubber plate 20 and opening the insertion hole 27 on the side of the limiting groove 25, the rubber plate 20 can be limited by inserting the rod 19 into the insertion hole 27.

[0038] One end of the fixing rod 26 is fixedly connected to the baffle 28. There are four baffles 28. By installing the baffles 28 at one end of the fixing rod 26, the fixing rod 26 can be prevented from slipping off the mounting plate 18.

[0039] The working principle of this self-locking low residual liquid connector is as follows: When using this connector, first install it on the loading arm. The first fixing ring 9 and the second fixing ring 10 are then fitted onto the connector body 1 and the outside of the loading arm. The first fixing ring 9 and the second fixing ring 10 are easily initially fixed using the adhesive ring 13. Then, the first fixing ring 9 and the second fixing ring 10 are fixed using the first square plate 11 and the second square plate 12. The threaded rod 15 is inserted into the second square plate 12, and the internal thread seat 17 is rotated while holding the turntable 16 to tighten the threaded rod 15. At this point, the connector is fully tightened. The first fixing ring 9 and the second fixing ring 10 are fixed to the outside of the connector body 1. The connection between the connector body 1 and the loading arm can be enhanced by the connecting plate 14, making the connection more stable. Before using the connector, the adhesive plate 21 and the rubber plate 20 are installed on the side of the limiting groove 25. The insertion rod 19 is inserted into the insertion hole 27 to limit the rubber plate 20. The fixing rod 26 is directly snapped into the fixing groove 22 through the sliding groove 23. At this time, the adhesive plate 21 can be fixed to the surface of the limiting groove 25 by the rubber plate 20. When the limiting is achieved... When block 6 is engaged inside the limiting groove 25, it is directly bonded by the adhesive plate 21. This prevents the limiting block 6 from loosening and coming out of the limiting groove 25, making it more stable. The connector can then be used. The locking sleeve 3 has a guide groove 7 and a guide post 2. Pulling the locking sleeve 3 backward by hand causes it to move backward along the guide groove 7, and the limiting block 6 on the locking sleeve 3 moves into the limiting groove 25 of the handwheel 4. Align the connector with the male connector 8 on the tank truck, release the locking sleeve 3, and it will return to its original position under the spring force. The steel ball 29 inside fits perfectly onto the male connector 8, thus completing the connection between the quick connector and the male connector 8. At this point, turning the handwheel 4 counterclockwise rotates the internal gear 24 of the valve body, causing the rack to move the sealing valve disc backward. The valve disc opens, allowing unobstructed flow inside the connector. When the handwheel 4 rotates to the position of the positioning pin 5, the positioning pin 5 automatically falls into the positioning hole, preventing the handwheel 4 from rotating. Since the handwheel 4 has only one limiting groove 25, and the limiting block 6 on the locking sleeve 3 can only move backward into the limiting groove 25 of the handwheel 4 when the handwheel 4 is in the reset state, the handwheel 4 cannot rotate after the positioning pin 5 falls into the positioning hole. Under the action of the limiting block 6, the locking sleeve 3 cannot be pulled backward, thus achieving the self-locking and anti-dislodgement function of the entire connector. This ensures safe and reliable operation when using loading arms for loading. After loading is complete, repeat the above steps in reverse order to unlock the valve. During this process, the plunger 30 at the front of the valve body moves forward under the action of the rack, sealing the valve disc against the connector end, preventing the medium from flowing out. The plunger 30 pushes excess medium back into the male port of the tanker truck, ensuring that there is no excessive residual medium at the pipeline interface, avoiding waste and reducing environmental pollution, while also increasing safety. The entire operation is simple and clear, improving work efficiency and ensuring safety.The transmission mechanism of the aforementioned gear 24 rack is equipped with a return spring. From the working state to the reset state, it can quickly reset under the action of the return spring force. At the same time, the valve disc and the end face can be completely sealed, realizing the self-sealing function of the joint. This joint meets the self-locking and anti-detachment function required by relevant standards, ensuring loading safety, simple operation, improving work efficiency, and reducing media waste and environmental pollution.

[0040] It is understood that the present invention has been described through some embodiments, and those skilled in the art will recognize that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. Furthermore, under the teachings of the present invention, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the protection scope of the present invention.

Claims

1. A self-locking low residual liquid connector, comprising a connector body (1) and a male connector (8), characterized in that: The connector body (1) is provided with a plunger (30) inside, and a locking sleeve (3) is sleeved on the outside of the plunger (30). A guide groove (7) is opened on the surface of the locking sleeve (3). A guide post (2) is provided on the side of the plunger (30). A handwheel (4) is provided on the side of the connector body (1). A limiting block (6) is fixedly connected to the side of the locking sleeve (3). A limiting groove (25) is opened on the surface of the handwheel (4). A positioning pin (5) is provided on the surface of the handwheel (4). A gear (24) is provided inside the connector body (1). A steel ball (29) is provided inside the locking sleeve (3).

2. The self-locking low residual liquid connector according to claim 1, characterized in that: The connector body (1) is fitted with a first fixing ring (9), and the connector body (1) is fitted with a second fixing ring (10). The first fixing ring (9) and the second fixing ring (10) are provided with connecting plates (14) on their sides. There are two first fixing rings (9) and two second fixing rings (10). The first fixing ring (9) is fixedly connected to a first square plate (11) on its side, and the second fixing ring (10) is fixedly connected to a second square plate (12) on its side.

3. The self-locking low residual liquid connector according to claim 1, characterized in that: The limiting groove (25) is provided with a rubber plate (20) on the side, and an adhesive plate (21) is provided on the side of the rubber plate (20). The mounting plate (18) is fixedly connected to the side of the rubber plate (20). A fixing groove (22) is opened on the surface of the mounting plate (18). A sliding groove (23) is opened at one end of the fixing groove (22). A fixing rod (26) is fixedly connected to the side of the handwheel (4). There are four fixing rods (26). The fixing rods (26) are inserted into the fixing groove (22).

4. The self-locking low residual liquid connector according to claim 2, characterized in that: A threaded rod (15) is fixedly connected to the surface of the first square plate (11). The threaded rod (15) is inserted inside the second square plate (12). An internal threaded seat (17) is sleeved on the outside of the threaded rod (15).

5. The self-locking low residual liquid connector according to claim 4, characterized in that: The internal thread seat (17) is fixedly connected to a turntable (16), and there are two turntables (16).

6. The self-locking low residual liquid connector according to claim 2, characterized in that: The first fixing ring (9) and the second fixing ring (10) are provided with adhesive rings (13) on their sides, and the adhesive rings (13) are symmetrically distributed.

7. The self-locking low residual liquid connector according to claim 3, characterized in that: The rubber plate (20) is fixedly connected to the insert rod (19) on the side, and the limiting groove (25) has an insertion hole (27) on the side, and the insert rod (19) is inserted into the insertion hole (27).

8. The self-locking low residual liquid connector according to claim 3, characterized in that: One end of the fixing rod (26) is fixedly connected to a baffle (28), and there are four baffles (28).

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