An explosion-proof charging gun

Abstract

The present invention provides an explosion-proof charging gun, which includes a socket and a plug. The socket includes a socket housing, the interior of the socket housing is a wiring cavity, and a socket insulating member is arranged in the wiring cavity; an insertion rod is arranged inside the socket insulating member, and a socket insulating member pressing plate and a pressing plate locking member are sequentially arranged at the rear end. The plug includes a plug housing, a circular lining ring is arranged at the front end of the plug housing, and a locking ring is arranged outside the circular lining ring. A first annular groove with a semicircular cross-section is formed on the inner wall of the locking ring in contact with the circular lining ring, a second annular groove with a semicircular cross-section is formed at the corresponding position on the circular lining ring, and at least one first through hole communicating with the first annular groove and used for placing a ball is formed at the position on the locking ring corresponding to the first annular groove. The front end of the circular lining ring is inserted into the wiring cavity; the inner wall of the locking ring is threadedly connected to the outer wall of the front end of the socket housing. The explosion-proof charging gun of the present invention can achieve rapid and safe connection between the plug and the socket, is convenient for installation and maintenance, and has high safety.

Description

Technical Field

[0001] The present invention belongs to the technical field of explosion-proof electrical equipment, and more specifically, relates to an explosion-proof charging gun. Background Art

[0002] The explosion-proof charging gun is mainly used in the environment of coal mines underground, where there are explosive gas mixtures such as coal dust and methane. It can be used as a connecting device between a control cable and an explosion-proof electrical switch, or as an information communication cable connector underground in coal mines, and can also be used for charging new energy vehicles in coal mines. Generally, the explosion-proof charging gun includes a plug and a socket. When installing the cable on-site, the cable needs to be installed on the plug of the explosion-proof charging gun. When in use, the plug with the cable installed is inserted into the socket.

[0003] In the existing explosion-proof charging gun, the front ends of the plug and the socket have flanges, and the two flanges are fixed by fixing bolts and nuts to fix the plug and the socket. However, the installation and disassembly of a large number of bolts and nuts cause inconvenience in installation and maintenance, and the safety performance is also poor. Therefore, it is necessary to improve the existing explosion-proof charging gun. Summary of the Invention

[0004] The purpose of the present invention is to provide an explosion-proof charging gun to solve the above technical problems in the prior art.

[0005] To achieve the above purpose, the present invention adopts the following technical solutions:

[0006] An explosion-proof charging gun includes a socket and a plug, wherein: the socket includes a socket housing, the interior of the socket housing is a wiring cavity, and a socket insulating member is arranged in the wiring cavity; an insertion rod is arranged inside the socket insulating member, and a socket insulating member pressing plate and a pressing plate locking member are sequentially arranged at the rear end.

[0007] The plug includes a plug housing, a circular lining ring is provided at the front end of the plug housing, a locking ring is arranged outside the circular lining ring, and a plug insulating member is arranged inside; an insertion sleeve is arranged inside the plug insulating member, and a plug insulating member pressing plate and a grounding pressing plate are sequentially arranged at the rear end.

[0008] A first annular groove with a semicircular cross-section is formed on the inner wall of the locking ring in contact with the circular lining ring, a second annular groove with a semicircular cross-section is formed at the corresponding position on the circular lining ring, at least one first through hole communicating with the first annular groove for placing a ball is formed at the position on the locking ring corresponding to the first annular groove, and the first annular groove and the second annular groove together form a track for the ball to roll.

[0009] A second through hole is formed at the front end of the locking ring, and a first limiting groove in the shape of an internal thread is formed on the outer wall of the front end of the socket housing. A pin passes through the second through hole, and the bottom end of the pin can be clamped into the first limiting groove. When the locking ring is rotated, the bottom end of the pin drives the front end of the circular lining ring to insert into the wiring cavity at the front end of the socket housing.

[0010] Further, the number of the first through holes is three. After the balls are installed, the first through holes are sealed with pins.

[0011] According to the present invention, one or more third through holes are formed inside the plug insulator; correspondingly, one or more plug insulating insertion tubes are provided on the plug insulator pressing plate, and the plug insulating insertion tubes are inserted into the third through holes.

[0012] One or more fourth through holes are formed inside the socket insulator; correspondingly, one or more socket insulating insertion tubes are provided on the socket insulator pressing plate, and the socket insulating insertion tubes are inserted into the fourth through holes.

[0013] The third through holes and the fourth through holes are used for installing cable wires, and the number thereof is related to the number of the installed cable wires.

[0014] According to the present invention, the socket sleeve is arranged inside the third through hole, and jacks are formed at both ends of the socket sleeve; one end of the socket sleeve is inserted into the plug insulating insertion tube, the cable wire extends into the plug insulating insertion tube, and is inserted into the jack at the rear end of the socket sleeve.

[0015] One end of the plug rod is inserted into the jack at the front end of the socket sleeve, and the other end is arranged inside the third through hole and is connected to an electrical device.

[0016] According to the present invention, a stepped hole for the cable wire to pass through is formed inside the rear end of the plug housing, and a first sealing ring and a pressing ring are sequentially arranged on the outer side of the step of the stepped hole.

[0017] The front end of the pressing ring presses against the first sealing ring, and the rear end of the pressing ring is fixedly connected to the rear end of the plug housing through a fixing member; the first sealing ring, the pressing ring and the rear end of the plug housing together form a cable introducing device.

[0018] According to the present invention, two symmetrical semi-circular ring-shaped wire pressing blocks are arranged on the outer side of the rear end of the pressing ring.

[0019] A second limiting groove is formed on the end face of the wire pressing block in contact with the pressing ring, and the bottom surface of the second limiting groove is wider than the groove opening; correspondingly, a limiting block is arranged on the rear end face of the pressing ring, and the limiting block can be embedded into the second limiting groove.

[0020] The wire pressing block is provided with a fifth through hole penetrating the wire pressing block in the second limiting groove. A third limiting groove is provided on the limiting block, and a pin passes through the fifth through hole and is stuck in the third limiting groove to prevent the wire pressing block from falling off.

[0021] One end of the wire pressing block is provided with a threaded hole penetrating the wire pressing block. A bolt passes through the threaded hole and is fixed by a nut to fix the two wire pressing blocks.

[0022] According to the present invention, the cross-section of the second limiting groove is trapezoidal, and the cross-section of the corresponding limiting block is trapezoidal.

[0023] According to the present invention, a ring of annular first protrusions is provided on the outer side wall of the rear end of the circular lining ring, and a ring of annular second protrusions is provided on the outer side of the front end of the plug housing. The first protrusions and the second protrusions are fixed by fixing members.

[0024] According to the present invention, an annular sealing groove is further provided on the outer side wall of the rear end of the circular lining ring, and a second sealing ring is installed in the sealing groove.

[0025] According to the present invention, a connecting plate is further provided on the outside of the rear end of the socket housing, and the connecting plate is connected to the electrical equipment by fixing members.

[0026] According to the present invention, the pressing plate locking member is a fixed screw buckle, and a hole is opened in the middle of the screw buckle. The outer wall is threadedly connected to the inner wall of the socket housing.

[0027] Compared with the prior art, the present invention has the following beneficial technical effects:

[0028] (1). The explosion-proof charging gun of the present invention adopts a locking ring and realizes the quick and safe connection between the plug and the socket through a threaded connection method, making the installation and maintenance convenient, improving the use safety, and can be widely applied to fields such as underground mining operations and new energy vehicles.

[0029] (2). The wire pressing block and the pressing ring form a cable anti-loosening device, effectively preventing the cable from loosening during use, thereby improving the use safety. Description of the Drawings

[0030] Figure 1 It is a schematic structural diagram of the explosion-proof charging gun of the present invention.

[0031] Figure 2 It is Figure 1 A sectional view in the main viewing direction of

[0032] Figure 3 It is Figure 1 A right view of

[0033] Figure 4This is a schematic structural view of the wire pressing block of the present invention.

[0034] Figure 5 It is Figure 4 a left - view direction cross - sectional view.

[0035] Figure 6 This is a schematic structural view of the pressing ring of the present invention.

[0036] Figure 7 It is Figure 6 a left - view of

[0037] Figure 8 This is a schematic structural view of the wire pressing block with another type of second limiting groove.

[0038] Figure 9 It is corresponding to Figure 8 and is a schematic structural view of the pressing ring with another type of limiting block.

[0039] In the figure: 1 - socket, 2 - plug, 11 - socket housing, 12 - wiring cavity, 13 - socket insulator, 14 - plug rod, 15 - socket insulator pressing plate, 16 - pressing plate locking part, 21 - plug housing, 22 - round lining ring, 23 - locking ring, 24 - plug insulator, 25 - socket sleeve, 26 - plug insulator pressing plate, 27 - grounding pressing plate, 28 - stepped hole, 29 - first sealing ring, 210 - pressing ring, 220 - wire pressing block, 230 - second limiting groove, 240 - limiting block, 250 - threaded hole, 260 - fifth through - hole, 270 - third limiting groove, 280 - second sealing ring, 290 - handle, 111 - first limiting groove, 112 - connecting plate, 131 - fourth through - hole, 151 - socket insulating insertion tube, 211 - second protrusion, 221 - second annular groove, 222 - first protrusion, 223 - sealing groove, 231 - first annular groove, 232 - first through - hole, 233 - second through - hole, 241 - third through - hole, 261 - plug insulating insertion tube. Detailed implementation manners

[0040] The following combines the drawings and further elaborates on the technical solutions of the present invention with specific embodiments. It should be understood that the following embodiments are only used to illustrate the present invention and not to limit the scope of the present invention.

[0041] As Figures 1 to 3 shown, the explosion - proof charging gun of the present invention includes a socket 1 and a plug 2, wherein: the socket 1 includes a socket housing 11, the interior of the socket housing 11 is a wiring cavity 12, and a socket insulator 13 is arranged in the wiring cavity 12; an insertion rod 14 is arranged inside the socket insulator 13, and a socket insulator pressing plate 15 and a pressing plate locking part 16 are sequentially arranged at the rear end.

[0042] The plug 2 includes a plug housing 21. A circular lining ring 22 is provided at the front end of the plug housing 21. A locking ring 23 is arranged outside the circular lining ring 22, and a plug insulating member 24 is arranged inside. An insertion sleeve 25 is arranged inside the plug insulating member 24, and a plug insulating member pressing plate 26 and a grounding pressing plate 27 are successively arranged at the rear end.

[0043] On the inner wall of the locking ring 23 in contact with the circular lining ring 22, a first annular groove 231 with a semicircular cross-section is formed. At a corresponding position on the circular lining ring 22, a second annular groove 221 with a semicircular cross-section is formed. At a position on the locking ring 23 corresponding to the first annular groove 231, at least one first through hole 232 communicating with the first annular groove 231 and used for placing a ball is formed.

[0044] The first annular groove 231 and the second annular groove 221 jointly form a track for the ball to roll. When the ball enters the track defined by the first annular groove 231 and the second annular groove 221, it not only limits the position of the locking ring 23, but also enables the locking ring 23 to rotate radially outside the circular lining ring 22. When the front end of the circular lining ring 22 is inserted into the wiring cavity 12 at the front end of the socket 1, the locking ring 23 is rotated to lock the socket 1 and the plug 2.

[0045] A second through hole 233 is formed at the front end of the locking ring 23. An internally threaded first limiting groove 111 is formed on the outer wall at the front end of the socket housing 11. A pin passes through the second through hole 233, and the bottom end can be stuck into the first limiting groove 111. When the locking ring is rotated, the bottom end of the pin drives the front end of the circular lining ring 22 to be inserted into the wiring cavity 12 at the front end of the socket housing 11.

[0046] The explosion-proof charging gun of the present invention adopts a locking ring, and realizes the quick and safe connection between the plug and the socket through threaded connection, making the installation and maintenance convenient, improving the safety, and meeting the standard of GB3836. It can be widely applied to fields such as underground mine operations and new energy vehicles.

[0047] The grounding pressing plate 27 has two functions: (1) Fixing function. After components such as the plug insulating member 24, the insertion sleeve 25, and the plug insulating pressing plate 26 are installed in their corresponding positions, they are fixed by the grounding pressing plate 27. (2) Grounding function. An internal grounding device is arranged inside the grounding pressing plate 27 for grounding.

[0048] Such as Figure 2As shown, the pressing plate locking member 16 can be a screw thread. There is a hole in the middle of the screw thread, and the outer wall is threadedly connected to the inner wall of the socket housing 11. After components such as the socket insulating member 13, the plug rod 14, and the socket insulating pressing plate 15 are installed in their corresponding positions, use a fixed wrench to screw this screw thread to the corresponding position to play a role in pressing and fixing.

[0049] As Figure 2 shown, according to the present invention, the inside of the plug insulating member 24 has one or more third through holes 241; corresponding to the third through holes 241, one or more plug insulating insertion tubes 261 are provided on the plug insulating pressing plate 26, and the plug insulating insertion tubes 261 are inserted into the third through holes 241.

[0050] The inside of the socket insulating member 13 has one or more fourth through holes 131; corresponding to the fourth through holes 131, one or more socket insulating insertion tubes 151 are provided on the socket insulating pressing plate 15, and the socket insulating insertion tubes 151 are inserted into the fourth through holes 131.

[0051] As Figure 2 shown, according to the present invention, the socket 25 is arranged in the third through hole 241, and jacks are respectively opened at both ends of the socket 25; one end of the socket 25 is inserted into the plug insulating insertion tube 261, and the cable extends into the plug insulating insertion tube 261 and is inserted into the jack at the rear end of the socket 25.

[0052] One end of the plug rod 14 is inserted into the jack at the front end of the socket 25, and the other end is arranged in the fourth through hole 131 and is connected to an electrical device.

[0053] According to the present invention, the inside of the rear end of the plug housing 21 has a stepped hole 28 for the cable to pass through, and a first sealing ring 29 and a pressing ring 210 are sequentially arranged on the outer side of the step of the stepped hole 28.

[0054] The front end of the pressing ring 210 presses against the first sealing ring 29, and the rear end of the pressing ring 210 is fixedly connected to the rear end of the plug housing 21 through a fixing member (such as a bolt and nut assembly); the first sealing ring 29, the pressing ring 210 and the rear end of the plug housing 21 together form a cable introducing device.

[0055] As Figure 2 、 Figure 4 and Figure 5 shown, according to the present invention, two symmetric semi-circular ring-shaped wire pressing blocks 220 are arranged on the outer side of the rear end of the pressing ring 210. A second limiting groove 230 with a trapezoidal cross-section is opened on the end surface of the wire pressing block 220 in contact with the pressing ring 210, so that the bottom surface of the second limiting groove 230 is wider than the groove opening.

[0056] As Figure 2 and Figure 6 、 Figure 7 shown, corresponding to the position of the second limiting groove 230, a limiting block 240 with a trapezoidal cross-section is provided on the rear end face of the pressing ring 210, and the limiting block 240 is embedded in the second limiting groove 230. Thereby, the wire pressing block 220 cannot rotate on the pressing ring 210 and can only slide along the second limiting groove 230.

[0057] As Figure 8 and Figure 9 shown, the opening of the second limiting groove 230 is a long strip groove, and the inside is an arc groove. The maximum inner diameter of the arc groove is greater than the width of the long strip groove, and the limiting block 240 is a structure matching the second limiting groove 230.

[0058] The second limiting groove 230 can also be in other forms. As long as it is ensured that the bottom surface of the second limiting groove 230 is wider than the groove opening, after the corresponding limiting block 240 is installed in the second limiting groove 230, the wire pressing block 220 can only slide along the length direction of the second limiting groove 230 and will not come out.

[0059] As Figure 4 and 7 shown, a threaded hole 250 penetrating through the wire pressing block 220 is provided at one end of the wire pressing block 220. A bolt passes through the threaded hole 250 and is fixed by a nut to fix the two wire pressing blocks 220.

[0060] The wire pressing block 220 opens a fifth through hole 260 in the second limiting groove 230, and a third limiting groove 270 is opened on the limiting block 240. A pin passes through the fifth through hole 260 and is stuck in the third limiting groove 270 to prevent the wire pressing block 220 from falling off.

[0061] The structural cooperation between the wire pressing block 220 and the pressing ring 210 further improves the stability after the cable is installed and improves the use safety of the entire explosion-proof charging gun.

[0062] Further, the inner diameters of the two wire pressing blocks 220 are smaller than the inner diameter of the pressing ring 210. To ensure that the cable is pressed tightly and ensure the use safety of the explosion-proof charging gun.

[0063] As Figure 2 shown, according to the present invention, a ring-shaped first protrusion 222 is provided on the outer side wall of the rear end of the circular lining ring 22, and a ring-shaped second protrusion 211 is provided on the outer side of the front end of the plug housing 21. The first protrusion 222 and the second protrusion 211 are fixed by a fixing member (such as a screw). They can also be fixed by a bolt and nut assembly.

[0064] According to the present invention, an annular sealing groove 223 is further provided on the outer side wall of the rear end of the circular lining ring 22, and a second sealing ring 280 is installed in the sealing groove 223.

[0065] The design of the second sealing ring 280 can prevent sparks from leaking between the outer side wall of the rear end of the circular lining ring 22 and the plug housing 21, effectively ensuring the explosion-proof performance of the explosion-proof charging gun.

[0066] As Figure 2 and Figure 3 shown, according to the present invention, a connecting plate 112 is further provided outside the rear end of the socket housing 11, and the connecting plate 112 is connected to an electrical device through fixing parts (such as bolt and nut assemblies).

[0067] As Figure 1 shown, according to the present invention, a handle 290 is provided on the plug housing 21. The handle 290 facilitates the taking of the plug 1.

[0068] According to the present invention, the pressing plate locking part 16 can also be a component commonly used in the prior art for locking, such as in the form of the pressing ring 210 or a locking nut.

[0069] According to the present invention, the socket insulating part 13 and the plug insulating part 24 can be connected to multiple cable wires, including communication cables, positive and negative power cables, and grounding wires, for applications such as communication and charging.

[0070] As Figure 3 shown, according to a specific embodiment of the present invention, multiple cable wires such as power positive (DC+), power negative (DC-), charging connection confirmation (CC1), charging connection confirmation (CC2), charging communication (S-), charging communication (S+), low-voltage auxiliary power negative (A-), low-voltage auxiliary power positive (A+), grounding wire, etc. can be provided.

[0071] According to the present invention, the material of the insertion rod 14 of the explosion-proof charging gun is polytetrafluoroethylene, and the materials of the plug housing 21 and the socket housing 22 are cast and formed using tin bronze ZQSn-6-6-6 material.

[0072] According to the explosion-proof charging gun of the present invention, each explosion-proof joint surface meets the explosion-proof requirements of GB 3836.3-2010 / HEC60079-7:2006, GB3836.1-2010, and GB3836.2-2010.

[0073] During assembly, the plug 2 and the socket 1 can be inserted and unplugged flexibly without jamming, and the insertion and extraction force between the plug and the socket is 30-80N; the minimum creepage distance is 20mm, and the minimum electrical clearance is 12mm, all meeting the standards of GB3836.

[0074] For the flameproof charging gun of the present invention, during use, the front end of the circular lining ring 22 is inserted into the wiring cavity 12 at the front end of the socket housing 11, so that the front end of the socket housing 11 enters between the inner wall of the locking ring 23 and the outer wall of the circular lining ring 22.

[0075] Then rotate the locking ring 23 to thread-connect the locking ring 23 with the front end of the socket housing 11, thereby realizing the quick and safe connection between the plug 2 and the socket 1.

[0076] The specific embodiments of the present invention have been described in detail above, but they are only examples, and the present invention is not limited to the specific embodiments described above. For those skilled in the art, any equivalent modifications and substitutions made to this utility are also within the scope of the present invention. Therefore, equivalent transformations and modifications made without departing from the spirit and scope of the present invention should all be covered within the scope of the present invention.

Claims

1. An explosion-proof charging gun, characterized in that, it includes a socket and a plug, wherein: the socket includes a socket housing, the interior of the socket housing is a wiring cavity, and a socket insulating member is arranged in the wiring cavity; an insertion rod is arranged inside the socket insulating member, and a socket insulating member pressing plate and a pressing plate locking member are sequentially arranged at the rear end; the plug includes a plug housing, a circular lining ring is arranged at the front end of the plug housing, a locking ring is arranged outside the circular lining ring, and a plug insulating member is arranged inside; an insertion sleeve is arranged inside the plug insulating member, and a plug insulating member pressing plate and a grounding pressing plate are sequentially arranged at the rear end; a first annular groove with a semicircular cross-section is formed on the inner wall of the locking ring in contact with the circular lining ring, a second annular groove with a semicircular cross-section is formed at the corresponding position on the circular lining ring, and at least one first through hole for placing a ball and communicating with the first annular groove is formed at the position on the locking ring corresponding to the first annular groove, and the first annular groove and the second annular groove together form a track for the ball to roll; a second through hole is formed at the front end of the locking ring, and an internally threaded first limiting groove is formed on the outer wall of the front end of the socket housing. A pin passes through the second through hole, and the bottom end can be clamped into the first limiting groove; when the locking ring is rotated, the bottom end of the pin drives the front end of the circular lining ring to insert into the wiring cavity at the front end of the socket housing; a stepped hole for the cable to pass through is formed inside the rear end of the plug housing, and a first sealing ring and a pressing ring are sequentially arranged on the stepped outside of the stepped hole; the front end of the pressing ring presses against the first sealing ring, and the rear end of the pressing ring is fixedly connected to the rear end of the plug housing through a fixing member; the first sealing ring, the pressing ring and the rear end of the plug housing together form a cable inlet device; two symmetric semi-circular ring-shaped wire pressing blocks are arranged on the outer side of the rear end of the pressing ring; a second limiting groove is formed on the end face of the wire pressing block in contact with the pressing ring, and the bottom surface of the second limiting groove is wider than the groove opening; corresponding to the position of the second limiting groove, a limiting block is arranged on the rear end face of the pressing ring, and the limiting block can be embedded into the second limiting groove; a fifth through hole penetrating the wire pressing block is formed in the second limiting groove of the wire pressing block, and a third limiting groove is formed on the limiting block. A pin passes through the fifth through hole and is clamped into the third limiting groove to prevent the wire pressing block from falling off; the inner diameters of the two wire pressing blocks are smaller than the inner diameter of the pressing ring; one or more third through holes are formed inside the plug insulating member; corresponding to the third through holes, one or more plug insulating insertion tubes are arranged on the plug insulating member pressing plate, and the plug insulating insertion tubes are inserted into the third through holes; one or more fourth through holes are formed inside the socket insulating member; corresponding to the fourth through holes, one or more socket insulating insertion tubes are arranged on the socket insulating member pressing plate, and the socket insulating insertion tubes are inserted into the fourth through holes.

2. The explosion-proof charging gun according to claim 1, characterized in that, The socket sleeve is arranged in the third through hole, and jacks are respectively formed at both ends of the socket sleeve; one end of the socket sleeve is inserted into the plug insulating tube, the cable extends into the plug insulating tube and is inserted into the jack at the rear end of the socket sleeve. One end of the plug rod is inserted into the jack at the front end of the socket sleeve, and the other end is arranged in the third through hole and is connected to the electrical equipment.

3. The flameproof charging gun according to claim 1, characterized in that A threaded hole penetrating through the wire pressing block is formed at one end of the wire pressing block, a bolt passes through the threaded hole and is fixed by a nut to fix the two wire pressing blocks.

4. The flameproof charging gun according to claim 3, characterized in that The cross section of the second limiting groove is trapezoidal, and the cross section of the corresponding limiting block is trapezoidal.

5. The flameproof charging gun according to any one of claims 1-4, characterized in that A circular first protrusion is provided on the outer side wall at the rear end of the circular lining ring, and a circular second protrusion is provided on the outer side at the front end of the plug housing. The first protrusion and the second protrusion are fixed by a fixing member.

6. The flameproof charging gun according to claim 5, characterized in that An annular sealing groove is further provided on the outer side wall at the rear end of the circular lining ring, and a second sealing ring is installed in the sealing groove.

7. The flameproof charging gun according to claim 5, characterized in that A connecting plate is further provided on the outside of the rear end of the socket housing, and the connecting plate is connected to the electrical equipment by a fixing member.

8. The flameproof charging gun according to claim 7, characterized in that The pressing plate locking member is a fixed screw, a hole is formed in the middle of the screw, and the outer wall is threadedly connected to the inner wall of the socket housing.

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