Plug for trailer

Abstract

The invention discloses a plug for a trailer, and aims to provide a plug 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 cable branching block has the beneficial effects that the inflation cavity in the compression sealing gasket is arranged on the cable branching block, when the compression sealing gasket is pressed, the inflation cavity deforms and makes close contact with the inner wall of the connecting line and the inner wall of the tightening ring, and then the sealing effect is improved.

Description

Technical Field

[0001] The present invention relates to the technical field related to electric components for trailers, and in particular to a plug for trailers. Background Art

[0002] RVs are both "houses" and "cars". They are a type of vehicle that can be moved and lived in. RVs are equipped with various household appliances, which are powered by the onboard battery of the RV. A plug structure is required for power supply.

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

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

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a plug for a trailer, comprising an outer plug tube, the inner part of the outer plug tube is connected to a plug inner core connected to a connecting line, the head end of the outer plug tube is connected to a foldable sealing cover, the inner part of the rear end of the outer plug tube is connected to a branching block for fixing the connecting line, the outer side of the rear end of the outer plug tube is connected to a fastening ring, the branching block is provided with a compression sealing gasket, and the compression sealing gasket is in contact with the inner wall of the outer plug 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 can be folded. 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 preventing the 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 is convenient for 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 arranged 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 being compressed, so as to seal 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 with a hinge shaft, the sealing cover is provided with a mounting seat, the hinge shaft is connected with the mounting seat, a torsion spring is sleeved and installed on the hinge shaft, one end of the torsion spring is connected with the hinge seat, and the other end of the torsion spring is connected with the mounting seat. A hinge seat is provided at the head end of the outer tube of the plug, a hinge hole is provided on the hinge seat, and a hinge shaft is inserted inside the hinge hole. At the same time, a mounting seat is provided on the sealing cover, the mounting seat is sleeved with the hinge shaft, and a torsion spring is installed on the hinge shaft, and the two ends of the torsion spring are respectively connected with 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 the compression of the sealing cover, 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, and the paddle is connected to the side end surface of the sealing cover to facilitate the opening and closing operation of the sealing cover, thereby improving the convenience of operation.

[0009] Preferably, the inner bottom surface of the sealing cover is provided with an installation groove, the installation groove is clamped with a sealing ring, the end surface of the sealing ring is conical, 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 installation clamping sealing ring is 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 conical, and the conical surface of the end of the sealing ring contacts the inner wall of the outer tube of the plug, so as to improve 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 conical surface of the sealing ring, and the clearance grooves can improve the strength of the sealing ring. At the same time, when the sealing cover is closed, the set clearance grooves can facilitate the contact between the conical surface of the sealing ring and the inner wall of the outer tube of the plug, so as to facilitate 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 side wall of the plug outer tube is provided with a guide groove, the outer side wall of the sealing ring is connected to a blocking block, and the blocking block is engaged with the guide groove. The inner side wall of the plug outer tube is provided with a guide groove, which serves as a guide when the external plug is plugged in, and improves the stability of the external plug after plugging in. At the same time, after the sealing cover is closed, the blocking block provided on the outer side wall of the sealing ring can be inserted into the guide groove to complete the blocking and sealing of the guide groove, thereby improving 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 side wall of the inner core of the plug is provided with a locking groove, and the screw passes through the threaded hole and is inserted into the locking groove. The threaded hole provided on the outer tube of the plug is provided with a screw, 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 side wall of the inner core of the plug, so as to fix the inner core of the plug and ensure the installation stability of the inner core of the plug.

[0012] Preferably, the end surface of the plug inner core facing the rear end of the plug outer tube is provided with a plurality of separators, and the terminal installed on the plug inner core is placed between adjacent separators. The plurality of separators provided at the rear end of the plug inner core separate the terminal installed on the plug inner core to prevent short circuit when the connecting wire is connected to the terminal, thereby avoiding the occurrence of short circuit.

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

[0014] Preferably, the end of the fastening ring is tapered, the inner wall of the fastening ring contacts the tightening ring, a limit block is arranged on the inner wall of the fastening ring, and the limit block 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 arranged 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 block. When the fastening ring and the tightening ring are threadedly connected, the wedge block is inserted into the separation groove to play a limiting effect, thereby ensuring the tightness of the connection between the fastening ring and the tightening ring, avoiding the reversal of the fastening ring, and thus achieving the sealing effect of 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 wiring block is placed in the tightening ring, wherein the wiring 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 plurality of threading holes are arranged 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 arranged threading holes are all in a connected state, and at the same time, an inflation cavity is arranged 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 the deformation, thereby ensuring the sealing effect between the threading hole and the connecting wire, and at the same time, the inflation cavity arranged on the outer peripheral side wall of the compression sealing gasket, when the compression sealing gasket is squeezed, the inflation cavity arranged on the outer periphery is squeezed and contacts with 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 present invention are as follows: the sealing ring and the blocking block installed on the sealing cover can ensure the sealing effect 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 preventing a short circuit of the connector on the inner core of the plug. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a stereoscopic view of the present invention; Figure 2 It is an exploded view of the present invention; Figure 3 This is an exploded view of the fastening ring in the present invention; Figure 4 It is a cross-sectional view of the sealing cover in the present invention; Figure 5 It is a cross-sectional view of the compression seal gasket in the present invention.

[0018] In the accompanying drawings, 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. Make way groove, 35. Blocking block, 40. Front end block, 41. Rear end block, 50. Limit block, 60. Inflatable chamber. DETAILED DESCRIPTION

[0019] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0020] 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, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0021] 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 accompanying drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to those of ordinary skill in the relevant art may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be considered as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so that once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0022] 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.

[0023] Embodiment 1, as Figure 1-5 As shown, a plug for a trailer comprises an outer plug tube 1, the inner part of the outer plug tube 1 is connected with a plug inner core 2 connected with a connecting line, the head end of the outer plug tube 1 is connected with a foldable sealing cover 3, the inner part of the tail end of the outer plug tube 1 is connected with a branching block 4 for fixing the connecting line, the outer side of the tail end of the outer plug tube 1 is connected with 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 outer plug tube 1.

[0024] An articulated seat 10 is provided at the head end of the plug outer tube 1, and the articulated seat 10 is connected to an articulated shaft 11. The sealing cover 3 is provided with a mounting seat 30, and the articulated shaft 11 is connected to the mounting seat 30. A torsion spring 12 is sleeved and installed on the articulated shaft 11, and one end of the torsion spring 12 is connected to the articulated seat 10, and the other end of the torsion spring 12 is connected to the mounting seat 30.

[0025] The side end of the sealing cover 3 is connected with a paddle 31. 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 clearance grooves 34, and the plurality of clearance grooves 34 are arranged at equal intervals.

[0026] 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 a blocking block 35 , and the blocking block 35 is clamped with the guide groove 13 .

[0027] The plug outer tube 1 is provided with a threaded hole 14 , and a screw 15 is installed in the threaded hole 14 . 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 inserted into the locking groove 20 .

[0028] A plurality of separators 21 are arranged on the end surface of the plug inner core 2 facing the rear end of the plug outer tube 1 , and the terminal posts installed on the plug inner core 2 are placed between adjacent separators 21 .

[0029] 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 .

[0030] 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 .

[0031] 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.

[0032] The working principle of the present invention is: 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, so as to prevent external water and impurities from entering the plug outer tube 1 from the head of the plug outer tube 1, and to avoid causing a 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, and it is convenient for 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 arranged 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, so as to seal 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 connector on the plug inner core 2, and thus improving the sealing effect of the plug.

[0033] Among them, a hinge seat 10 is arranged at the head end of the outer tube 1 of the plug, and a hinge hole is arranged on the hinge seat 10, and a hinge shaft 11 is inserted in the hinge hole. At the same time, a mounting seat 30 is arranged 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 the compression of the sealing cover 3, 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, and ensure the sealing effect after the sealing cover 3 is closed.

[0034] The paddle 31 is connected to the side end surface of the sealing cover 3 to facilitate the opening and closing operation of the sealing cover 3, thereby improving the convenience of operation.

[0035] Among them, an installation clamping sealing ring 33 is arranged on the inner bottom surface of the sealing cover 3, wherein the sealing ring 33 is made of rubber material, and the end face of the sealing ring 33 is conical. The conical 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 arranged on the outer side wall of the conical 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 set clearance grooves 34 can facilitate the contact between the conical 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.

[0036] Among them, a guide groove is provided on the inner 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 sealing block 35 provided on the outer wall of the sealing ring 33 can be inserted into the guide groove to complete the sealing of the guide groove and improve the sealing effect.

[0037] Among them, a screw 15 is installed in the threaded hole 14 set 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 pass through the threaded hole 14 and be inserted into the locking groove 20 set 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.

[0038] Among them, a plurality of separation sheets 21 arranged at the rear end of the plug inner core 2 separate the terminals installed on the plug inner core 2 to prevent the connection line from short-circuiting when the connection line is connected to the terminal, thereby avoiding the occurrence of a short circuit.

[0039] Among them, a tightening ring 16 is arranged on the tail end of the outer tube 1 of the plug, and a plurality of separation grooves 17 are arranged on the tightening ring 16, and the separation grooves 17 can divide the tightening ring 16 into a grid shape, and an external thread is arranged on the outer bottom of the tightening ring 16. At the same time, an internal thread is arranged 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 the 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.

[0040] 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 arranged 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 is threadedly connected with the tightening ring 16, the wedge-shaped block is clamped into the separation groove 17 to play 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.

[0041] The branching block 4 is placed in the tightening ring 16, wherein the branching 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 pad 6 is a rubber block, and a plurality of threading holes 7 are arranged on the front end block 40, the rear end block 41 and the compression sealing pad 6, and the number of the threading holes 7 corresponds to the number of connected connection lines, wherein the threading holes 7 are all in a connected state, and at the same time, an inflation cavity 60 is arranged around the threading holes 7 of the compression sealing pad 6, and the compression sealing pad 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 when the compression sealing gasket 6 is squeezed, and contacts with 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.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features thereof may be replaced by equivalents. 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 trailer plug, 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 wire, 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 wire, the outer side of the tail end of the plug outer tube (1) is connected to a fastening ring (5), and the branching block (4) is provided with a compression sealing pad (6), and the compression sealing pad (6) is in contact with the inner wall of the plug outer tube (1).

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

5. A trailer plug 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. A trailer plug 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 inserted into the locking groove (20).

7. A trailer plug according to claim 1, characterized in that: 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).

8. A trailer plug according to claim 1, characterized in that: A tightening ring (16) is provided at the rear end of the plug outer tube (1), a plurality of separation grooves (17) are provided at the end of the tightening ring (16), an outer bottom of the tightening ring (16) is provided with an external thread, 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 according to claim 8, characterized in that: The end of the fastening ring (5) is tapered, the inner wall of the fastening ring (5) is in contact with 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).

10. A trailer plug according to claim 8, characterized in that: The line dividing block (4) is placed in the tightening ring (16), and the line dividing block (4) comprises 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.

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