Plug structure for trailer

Abstract

The utility model discloses a plug structure for a trailer, and aims to provide a plug structure for a trailer, which is good in sealing effect and avoids short circuit. Comprising a plug outer tube, the plug outer tube is internally connected with a plug inner core connected with a connecting line, the head end of the plug outer tube is connected with a foldable sealing cover, the tail end of the plug outer tube is internally connected with a branching block for fixing the connecting line, the outer side of the tail end of the plug outer tube is connected with a fastening ring, and the branching block is provided with a compression sealing gasket. And the compression sealing gasket is in contact with the inner wall of the plug outer tube. The beneficial effects of the utility model are that the air inflation cavity on the compression sealing gasket arranged on the branching block deforms when the compression sealing gasket is pressed, and is in close contact with the inner walls of the connecting line and the tightening ring, thereby improving the sealing effect.

Description

Technical Field

[0001] The utility model relates to the technical field related to trailer electrical components, in particular to a plug structure for a trailer. Background Art

[0002] A recreational vehicle (RV) combines the functions of a "house" and a "car," a type of vehicle that is both portable and habitable. RVs are equipped with various household appliances, powered by an onboard battery. This requires a plug.

[0003] When driving an RV, there will be sections of water. Since the sealing effect of existing plugs is poor, water will splash into the plug after passing through the flooded section, causing a short circuit during use, causing damage to the vehicle and posing a safety issue. Utility Model Content

[0004] The utility model aims to overcome the shortcomings of the prior art plugs, which have poor sealing effect and are prone to short circuits, and provides a plug structure for trailers, which has good sealing effect and avoids short circuits.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solution: a plug structure for a trailer, comprising a plug outer tube, a plug inner core connected to a connecting line is connected to the interior of the plug outer tube, a foldable sealing cover is connected to the head end of the plug outer tube, a branching block for fixing the connecting line is connected to the interior of the tail end of the plug outer tube, a fastening ring is connected to the outside of the tail end of the plug outer tube, and a compression sealing gasket is provided on the branching block, which contacts the inner wall of the plug outer tube.

[0006] The plug includes an outer tube of the plug, which is a cylindrical tube. A plug inner core is installed in the middle of the outer tube of the plug, and the inner core of the plug is used to connect the connecting wire. A sealing cover is connected to the head end of the outer tube of the plug, and the sealing cover is foldable. When in use, the sealing cover is opened, and when not in use, the sealing cover is closed to achieve a sealing effect, thereby preventing external water and impurities from entering the outer tube of the plug from the head of the outer tube of the plug, and avoiding causing a short circuit of the plug-in piece on the inner core of the plug. At the same time, a branching block is connected to the tail end of the outer tube of the plug, and the branching block is used to separate the connecting wires connected to the inner core of the plug, so that the connecting wires correspond to the plug-in piece on the inner core of the plug, which facilitates the connection and installation of the connecting wires. At the same time, a fastening ring is connected to the tail end of the outer tube of the plug, and the fastening ring can fix the branching block. A compression sealing gasket is provided on the branching block. The compression sealing gasket can be compressed and can contact the inner wall of the outer tube of the plug after compression, thereby sealing the branching block and the outer tube of the plug, thereby preventing external water and impurities from entering the interior of the outer tube of the plug from the tail of the outer tube of the plug, avoiding short circuit of the connector on the inner core of the plug, and thus improving the sealing effect of the plug.

[0007] Preferably, a hinge seat is provided at the head end of the outer tube of the plug, the hinge seat is connected to a hinge shaft, the sealing cover is provided with a mounting seat, the hinge shaft is connected to the mounting seat, a torsion spring is sleeved and mounted on the hinge shaft, one end of the torsion spring is connected to the hinge seat, and the other end of the torsion spring is connected to the mounting seat. A hinge seat is provided at the head end of the outer tube of the plug, the hinge seat is provided with a hinge hole, the hinge shaft is inserted into the interior of the hinge hole, and a mounting seat is provided on the sealing cover, the mounting seat is sleeved with the hinge shaft, and a torsion spring is mounted on the hinge shaft, with the two ends of the torsion spring respectively connected to the hinge seat and the mounting seat. When the sealing cover is closed, the elastic force of the torsion spring can exert pressure on the sealing cover to ensure that the sealing cover is pressed tightly, thereby improving the sealing effect. At the same time, when the sealing cover is opened, the elastic force provided by the torsion spring can help the sealing cover rebound, which is convenient for the sealing cover to rebound after use and ensure the sealing effect after the sealing cover is closed.

[0008] Preferably, a paddle is connected to the side end of the sealing cover, which facilitates the opening and closing operation of the sealing cover and improves the convenience of operation.

[0009] Preferably, the inner bottom surface of the sealing cover is provided with a mounting groove, the mounting groove is clamped with a sealing ring, the end surface of the sealing ring is tapered, the end of the sealing ring contacts the inner wall of the outer tube of the plug, and the side wall of the end surface of the sealing ring is provided with a plurality of clearance grooves, which are arranged at equal intervals. The mounting clamping sealing ring provided on the inner bottom surface of the sealing groove, wherein the sealing ring is made of rubber material, the end surface of the sealing ring is tapered, and the tapered surface of the end of the sealing ring contacts the inner wall of the outer tube of the plug, thereby improving the sealing effect between the sealing cover and the outer tube of the plug after the sealing cover is closed. At the same time, a plurality of clearance grooves are provided on the outer side wall of the tapered surface of the sealing ring, wherein the clearance grooves can improve the strength of the sealing ring. At the same time, when the sealing cover is closed, the provided clearance grooves can facilitate the contact between the tapered surface of the sealing ring and the inner wall of the outer tube of the plug, thereby conveniently determining the sealing effect between the sealing ring and the inner wall of the outer tube of the plug after the sealing cover is closed.

[0010] Preferably, the inner sidewall of the plug outer tube is provided with a guide groove, and the outer sidewall of the sealing ring is connected to a blocking block, which is engaged with the guide groove. The guide groove provided on the inner sidewall of the plug outer tube serves to guide the external plug during insertion and improves the stability of the external plug after insertion. At the same time, after the sealing cover is closed, the blocking block provided on the outer sidewall of the sealing ring can be inserted into the guide groove to complete the sealing of the guide groove and improve the sealing effect.

[0011] Preferably, the outer tube of the plug is provided with a threaded hole, a screw is installed in the threaded hole, and the outer wall of the inner core of the plug is provided with a locking groove, and the screw is inserted through the threaded hole and locked into the locking groove. The screw is installed in the threaded hole provided on the outer tube of the plug, and the inner core of the plug is placed on the inner wall of the outer tube of the plug. By selecting the screw, the screw can be inserted through the threaded hole into the locking groove provided on the outer wall of the inner core of the plug, thereby fixing the inner core of the plug and ensuring the installation stability of the inner core of the plug.

[0012] Preferably, the end surface of the plug core facing the rear end of the plug outer tube is provided with a plurality of separators, and the terminal blocks mounted on the plug core are positioned between adjacent separators. The plurality of separators provided toward the rear end of the plug core separate the terminal blocks mounted on the plug core, thereby preventing short circuits when connecting the connecting wires to the terminal blocks, thereby avoiding the occurrence of short circuits.

[0013] Preferably, a tightening ring is provided at the tail end of the outer tube of the plug, the end of the tightening ring is provided with a plurality of separation grooves, the outer bottom of the tightening ring is externally threaded, the fastening ring is provided with an internal thread, and the fastening ring is threadedly connected to the tightening ring. A tightening ring is provided at the tail end of the outer tube of the plug, the tightening ring is provided with a plurality of separation grooves, the separation grooves can divide the tightening ring into a grid shape, the outer bottom of the tightening ring is provided with an external thread, and the inner side of the fastening ring is provided with an internal thread. After the fastening ring and the tightening ring are sleeved together, they are rotated to achieve a threaded connection. After the connection is completed, the fastening ring presses the tightening ring to achieve the effect of narrowing the tightening ring, thereby ensuring a sealing effect.

[0014] Preferably, the end of the fastening ring is tapered, the inner wall of the fastening ring contacts the tightening ring, and a limit block is provided on the inner wall of the fastening ring, which is engaged with the separation groove. The end of the fastening ring is tapered, and when it is installed on the tightening ring, the tightening ring can be closed. At the same time, a limit block is provided on the inner wall of the fastening ring, and the limit block is engaged with the separation groove. At the same time, the limit block is a wedge-shaped block. When the fastening ring and the tightening ring are threaded together, the wedge-shaped block is engaged in the separation groove, which plays a limiting role, thereby ensuring the tightness of the connection between the fastening ring and the tightening ring, preventing the fastening ring from reversing, and thus achieving a sealing effect between the fastening ring and the tightening ring.

[0015] Preferably, the branching block is placed in the tightening ring, the branching block includes a front end block and a rear end block, the compression sealing gasket is placed between the front end block and the rear end block and the two side surfaces of the compression sealing gasket are respectively bonded to the front end block and the rear end block, the front end block, the rear end block and the compression sealing gasket are all provided with a plurality of threading holes, an inflation cavity is provided around the threading holes of the compression sealing gasket, and the side end of the rear end block is a conical surface. The branching block is placed in the tightening ring, wherein the branching block consists of a front end block and a rear end block, wherein a compression sealing block is bonded between the front end block and the rear end block, and the compression sealing gasket is a rubber block, and a number of threading holes are set on the front end block, the rear end block and the compression sealing gasket, and the number of the threading holes corresponds to the number of connected connecting wires, wherein the set threading holes are all in a connected state, and at the same time, an inflation cavity is set around the threading hole of the compression sealing gasket, and when the compression sealing gasket is squeezed, the inflation cavity will deform, so that the inflation cavity set around the threading hole will squeeze the connecting wire due to deformation, thereby ensuring the sealing effect between the threading hole and the connecting wire, and at the same time, the inflation cavity set on the outer peripheral side wall of the compression sealing gasket, when the compression sealing gasket is squeezed, the inflation cavity set on the outer periphery is squeezed and contacts the inner wall of the tightening ring, thereby improving the sealing effect, preventing external water and impurities from entering the outer tube of the plug from the head of the outer tube of the plug, and avoiding causing a short circuit of the connector on the inner core of the plug.

[0016] The beneficial effects of the utility model are as follows: the sealing ring and the blocking block installed on the sealing cover can ensure the sealing effect of the sealing cover when the sealing cover is in a closed state; the inflation cavity on the compression sealing gasket arranged on the branching block deforms when the compression sealing gasket is pressurized, and is in close contact with the inner walls of the connecting wire and the tightening ring respectively, thereby improving the sealing effect; and preventing external water and impurities from entering the outer tube of the plug from the head of the outer tube of the plug, thereby avoiding a short circuit of the connector on the inner core of the plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a three-dimensional view of the utility model;

[0018] Figure 2 It is an exploded view of the present utility model;

[0019] Figure 3 This is an exploded view of the fastening ring in the utility model;

[0020] Figure 4 This is a cross-sectional view of the sealing cover of the utility model;

[0021] Figure 5 It is a cross-sectional view of the compression sealing gasket in the utility model.

[0022] In the accompanying drawings,

[0023] 1. Plug outer tube, 2. Plug inner core, 3. Sealing cover, 4. Branching block, 5. Fastening ring, 6. Compression sealing gasket, 7. Threading hole, 10. Articulated seat, 11. Articulated shaft, 12. Torsion spring, 13. Guide groove, 14. Threaded hole, 15. Screw, 16. Tightening ring, 17. Separation groove, 20. Locking groove, 21. Separator, 30. Mounting seat, 31. Pick, 32. Mounting groove, 33. Sealing ring, 34. Clearance groove, 35. Blocking block, 40. Front block, 41. Rear block, 50. Limit block, 60. Inflatable chamber. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the embodiments described are only some of the embodiments of this application, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present application, its application, or use. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of this application.

[0025] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, operations, devices, components and / or combinations thereof.

[0026] Unless otherwise specifically stated, the relative arrangement of the parts, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the drawings are not drawn according to actual proportional relationships. The techniques, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, the techniques, methods and equipment should be considered as part of the authorization specification. In all examples shown and discussed here, any specific values ​​should be interpreted as being merely exemplary and not as limitations. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following figures, and therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures.

[0027] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of this application.

[0028] Example 1, as Figure 1-5 As shown, a plug structure for a trailer includes a plug outer tube 1, a plug inner core 2 connected to a connecting line is connected to the inside of the plug outer tube 1, a foldable sealing cover 3 is connected to the head end of the plug outer tube 1, a branching block 4 for fixing the connecting line is connected to the inside of the tail end of the plug outer tube 1, a fastening ring 5 is connected to the outside of the tail end of the plug outer tube 1, and the branching block 4 is provided with a compression sealing gasket 6, which is in contact with the inner wall of the plug outer tube 1.

[0029] A hinged seat 10 is provided at the head end of the plug outer tube 1, and the hinged seat 10 is connected to a hinged shaft 11. The sealing cover 3 is provided with a mounting seat 30, and the hinged shaft 11 is connected to the mounting seat 30. A torsion spring 12 is sleeved and installed on the hinged shaft 11. One end of the torsion spring 12 is connected to the hinged seat 10, and the other end of the torsion spring 12 is connected to the mounting seat 30.

[0030] A paddle 31 is connected to the side end of the sealing cover 3. The inner bottom surface of the sealing cover 3 is provided with a mounting groove 32, which is engaged with a sealing ring 33. The end face of the sealing ring 33 is tapered, and the end of the sealing ring 33 contacts the inner wall of the plug outer tube 1. The side wall of the end face of the sealing ring 33 is provided with a plurality of clearance grooves 34, which are arranged at equal intervals.

[0031] The inner side wall of the plug outer tube 1 is provided with a guide groove 13 , and the outer side wall of the sealing ring 33 is connected to the blocking block 35 , and the blocking block 35 is engaged with the guide groove 13 .

[0032] The outer tube 1 of the plug is provided with a threaded hole 14 , in which a screw 15 is installed. The outer side wall of the inner core 2 of the plug is provided with a locking groove 20 , in which the screw 15 passes through the threaded hole 14 and is inserted into the locking groove 20 .

[0033] A plurality of separators 21 are provided on the end surface of the plug inner core 2 facing the rear end of the plug outer tube 1 , and the terminal posts mounted on the plug inner core 2 are placed between adjacent separators 21 .

[0034] A tightening ring 16 is provided at the tail end of the plug outer tube 1, and a plurality of separation grooves 17 are provided at the end of the tightening ring 16. The outer bottom of the tightening ring 16 is externally threaded, and the fastening ring 5 is provided with an internal thread. The fastening ring 5 is threadedly connected to the tightening ring 16.

[0035] The end of the fastening ring 5 is tapered, and the inner wall of the fastening ring 5 contacts the tightening ring 16 . A limit block 50 is provided on the inner wall of the fastening ring 5 , and the limit block 50 is engaged with the separation groove 17 .

[0036] The branching block 4 is placed in the tightening ring 16, and the branching block 4 includes a front end block 40 and a rear end block 41. The compression sealing gasket 6 is placed between the front end block 40 and the rear end block 41, and the two side surfaces of the compression sealing gasket 6 are respectively bonded to the front end block 40 and the rear end block 41. The front end block 40, the rear end block 41 and the compression sealing gasket 6 are all provided with a plurality of threading holes 7. The outer peripheral side wall of the compression sealing gasket 6 and the inner wall of the threading hole 7 on the compression sealing gasket 6 are both provided with an inflation cavity 60, and the side end of the rear end block 41 is a conical surface.

[0037] The working principle of this utility model is as follows: Figure 1-5 As shown, the plug includes a plug outer tube 1, which is a cylindrical tube. A plug inner core 2 is installed in the middle of the plug outer tube 1, and the plug inner core 2 is used to connect the connecting wire. A sealing cover 3 is connected to the head end of the plug outer tube 1, and the sealing cover 3 is foldable. When in use, the sealing cover 3 is opened, and when not in use, the sealing cover 3 is closed to achieve a sealing effect, thereby preventing external water and impurities from entering the plug outer tube 1 from the head of the plug outer tube 1, and preventing the short circuit of the plug-in piece on the plug inner core 2. At the same time, a branching block 4 is connected to the tail end of the plug outer tube 1, and the branching block 4 is used to separate the connecting wires connected to the plug inner core 2, so that the connecting wires correspond to the plug-in piece on the plug inner core 2, which facilitates the connection and installation of the connecting wires. At the same time, a fastening ring 5 is connected to the tail end of the plug outer tube 1, and the fastening ring 5 can fix the branching block 4. A compression sealing gasket 6 is provided on the branching block 4. The compression sealing gasket 6 can be compressed and can contact the inner wall of the plug outer tube 1 after being compressed, thereby sealing the branching block 4 and the plug outer tube 1, thereby preventing external water and impurities from entering the interior of the plug outer tube 1 from the tail of the plug outer tube 1, avoiding short circuit of the plug-in core 2, and thus improving the sealing effect of the plug.

[0038] Among them, a hinge seat 10 is provided at the head end of the outer tube 1 of the plug, and a hinge hole is provided on the hinge seat 10, and a hinge shaft 11 is inserted into the inside of the hinge hole. At the same time, a mounting seat 30 is provided on the sealing cover 3, and the mounting seat 30 is sleeved with the hinge shaft 11. At the same time, a torsion spring 12 is installed on the hinge shaft 11, and the two ends of the torsion spring 12 are respectively connected to the hinge seat 10 and the mounting seat 30. When the sealing cover 3 is closed, the elastic force of the torsion spring 12 can exert pressure on the sealing cover 3 to ensure that the sealing cover 3 is tightened, thereby improving the sealing effect. At the same time, when the sealing cover 3 is opened, the elastic force provided by the torsion spring 12 can help the sealing cover 3 rebound, which is convenient for the sealing cover 3 to rebound after use, thereby ensuring the sealing effect after the sealing cover 3 is closed.

[0039] The paddle 31 is connected to the side surface of the sealing cover 3 to facilitate the opening and closing operation of the sealing cover 3, thereby improving the operational convenience.

[0040] Among them, a mounting clamping sealing ring 33 is provided on the inner bottom surface of the sealing cover 3, wherein the sealing ring 33 is made of rubber, and the end face of the sealing ring 33 is tapered. The tapered surface at the end of the sealing ring 33 contacts the inner wall of the plug outer tube 1, thereby improving the sealing effect between the sealing cover 3 and the plug outer tube 1 after the sealing cover 3 is closed. At the same time, a plurality of clearance grooves 34 are provided on the outer side wall of the tapered surface of the sealing ring 33, and the clearance grooves 34 can improve the strength of the sealing ring 33. At the same time, when the sealing cover 3 is closed, the provided clearance grooves 34 can facilitate the contact between the tapered surface of the sealing ring 33 and the inner wall of the plug outer tube 1, thereby facilitating the sealing effect between the sealing ring 33 and the inner wall of the plug outer tube 1 after the sealing cover 3 is closed.

[0041] Among them, a guide groove is provided on the inner side wall of the plug outer tube 1, which serves as a guide when the external plug is plugged in, and at the same time improves the stability of the external plug after insertion. At the same time, after the sealing cover 3 is closed, the blocking block 35 provided on the outer side wall of the sealing ring 33 can be inserted into the guide groove to complete the blocking and sealing of the guide groove and improve the sealing effect.

[0042] Among them, a screw 15 is installed in the threaded hole 14 provided on the plug outer tube 1, and the plug core 2 is placed on the inner wall of the plug outer tube 1. By selecting the screw 15, the screw 15 can be inserted through the threaded hole 14 into the locking groove 20 provided on the outer wall of the plug core 2, thereby fixing the plug core 2 and ensuring the installation stability of the plug core 2.

[0043] Among them, a number of separation pieces 21 arranged at the tail end of the plug inner core 2 separate the terminals installed on the plug inner core 2 to prevent the connection wires from short-circuiting when connecting the terminals, thereby avoiding the occurrence of short circuits.

[0044] Among them, a tightening ring 16 is provided on the tail end of the outer tube 1 of the plug, and a plurality of separation grooves 17 are provided on the tightening ring 16. The separation grooves 17 can divide the tightening ring 16 into a grid shape, and an external thread is provided on the outer bottom of the tightening ring 16. At the same time, an internal thread is provided on the inner side of the fastening ring 5. After the fastening ring 5 and the tightening ring 16 are sleeved, they are rotated to realize threaded connection. After the connection is completed, the fastening ring 5 presses the tightening ring 16 to achieve the effect of narrowing the tightening ring 16, thereby ensuring the sealing effect.

[0045] Among them, the end of the fastening ring 5 is conical, and when it is installed on the tightening ring 16, the tightening ring 16 can be closed. At the same time, a limiting block 50 is provided on the inner wall of the fastening ring 5, and the limiting block 50 is in a clamping state with the separation groove 17. At the same time, the limiting block 50 is a wedge-shaped block. When the fastening ring 5 and the tightening ring 16 are threadedly connected, the wedge-shaped block is clamped into the separation groove 17, which plays a limiting effect, thereby ensuring the tightness of the connection between the fastening ring 5 and the tightening ring 16, avoiding the reversal of the fastening ring 5, and achieving the sealing effect of the fastening ring 5 and the tightening ring 16.

[0046] Among them, the branch block 4 is placed in the tightening ring 16, wherein the branch block 4 is composed of a front end block 40 and a rear end block 41, wherein a compression sealing block is bonded between the front end block 40 and the rear end block 41, and the compression sealing gasket 6 is a rubber block. A plurality of threading holes 7 are set on the front end block 40, the rear end block 41 and the compression sealing gasket 6. The number of the threading holes 7 corresponds to the number of connected connecting wires, wherein the threading holes 7 are all in a connected state. At the same time, an inflation cavity 60 is set around the threading holes 7 of the compression sealing gasket 6. When the compression sealing gasket 6 is When squeezed, the inflation cavity 60 will be deformed, so that the inflation cavity 60 set around the threading hole 7 will squeeze the connecting wire due to the deformation, thereby ensuring the sealing effect between the threading hole 7 and the connecting wire. At the same time, the inflation cavity 60 set on the outer peripheral side wall of the compression sealing gasket 6 is squeezed, and the inflation cavity 60 set on the outer periphery is squeezed when the compression sealing gasket 6 is squeezed, and contacts the inner wall of the tightening ring 16, thereby improving the sealing effect, preventing external water and impurities from entering the plug outer tube 1 from the head of the plug outer tube 1, and avoiding causing a short circuit of the connector on the plug inner core 2.

[0047] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A plug structure for a trailer, characterized in that: The invention comprises a plug outer tube (1), wherein the plug outer tube (1) is internally connected to a plug inner core (2) connected to a connecting line, the head end of the plug outer tube (1) is connected to a foldable sealing cover (3), the tail end of the plug outer tube (1) is internally connected to a branching block (4) for fixing the connecting line, the outer side of the tail end of the plug outer tube (1) is connected to a fastening ring (5), the branching block (4) is provided with a compression sealing gasket (6), and the compression sealing gasket (6) is in contact with the inner wall of the plug outer tube (1).

2. A trailer plug structure according to claim 1, characterized in that: A hinge seat (10) is provided at the head end of the plug outer tube (1), the hinge seat (10) is connected to a hinge shaft (11), the sealing cover (3) is provided with a mounting seat (30), the hinge shaft (11) is connected to the mounting seat (30), a torsion spring (12) is sleeved and mounted on the hinge shaft (11), one end of the torsion spring (12) is connected to the hinge seat (10), and the other end of the torsion spring (12) is connected to the mounting seat (30).

3. A trailer plug structure according to claim 1, characterized in that: A paddle (31) is connected to the side end of the sealing cover (3).

4. A trailer plug structure according to claim 1, characterized in that: The inner bottom surface of the sealing cover (3) is provided with a mounting groove (32), and a sealing ring (33) is clamped in the mounting groove (32). The end surface of the sealing ring (33) is conical, and the end of the sealing ring (33) contacts the inner wall of the plug outer tube (1). The side wall of the end surface of the sealing ring (33) is provided with a plurality of relief grooves (34), and the plurality of relief grooves (34) are arranged at equal intervals.

5. A trailer plug structure according to claim 4, characterized in that: The inner side wall of the plug outer tube (1) is provided with a guide groove (13), the outer side wall of the sealing ring (33) is connected to a blocking block (35), and the blocking block (35) is clamped with the guide groove (13).

6. The trailer plug structure according to claim 1, characterized in that: The plug outer tube (1) is provided with a threaded hole (14), a screw (15) is installed in the threaded hole (14), and the outer side wall of the plug inner core (2) is provided with a locking groove (20), and the screw (15) passes through the threaded hole (14) and is locked in the locking groove (20).

7. The trailer plug structure according to claim 1, wherein: The end surface of the plug inner core (2) facing the rear end of the plug outer tube (1) is provided with a plurality of separation plates (21), and the terminal posts mounted on the plug inner core (2) are placed between adjacent separation plates (21).

8. The trailer plug structure according to claim 1, wherein: The tail end of the plug outer tube (1) is provided with a tightening ring (16), the end of the tightening ring (16) is provided with a plurality of separation grooves (17), the outer bottom of the tightening ring (16) is externally threaded, the fastening ring (5) is provided with an internal thread, and the fastening ring (5) is threadedly connected to the tightening ring (16).

9. A trailer plug structure according to claim 8, characterized in that: The end of the fastening ring (5) is tapered, the inner wall of the fastening ring (5) contacts the tightening ring (16), a limiting block (50) is provided on the inner wall of the fastening ring (5), and the limiting block (50) is engaged with the separation groove (17).

10. The trailer plug structure according to claim 8, wherein: The line dividing block (4) is placed in the tightening ring (16), and the line dividing block (4) includes a front end block (40) and a rear end block (41). The compression sealing gasket (6) is placed between the front end block (40) and the rear end block (41), and the two side surfaces of the compression sealing gasket (6) are respectively bonded to the front end block (40) and the rear end block (41). The front end block (40), the rear end block (41) and the compression sealing gasket (6) are all provided with a plurality of threading holes (7). The outer peripheral side wall of the compression sealing gasket (6) and the inner wall of the threading hole (7) on the compression sealing gasket (6) are both provided with an inflation cavity (60), and the side end of the rear end block (41) is a tapered surface.

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