Grounding protection explosion-proof plug

Abstract

The application relates to a grounding protection explosion-proof plug, which comprises a shell assembly with a middle opening, a base assembly arranged in the shell assembly, and a plurality of crimping assemblies arranged in the base assembly; the base assembly further comprises a mounting seat embedded in the shell assembly, and a plurality of the crimping assemblies are fixed on the mounting seat; the crimping assembly comprises a plurality of butt plug pins and a grounding plug pin assembly, the grounding plug pin assembly comprises a grounding plug pin and a grounding spring sheet arranged on the grounding plug pin; and the grounding spring sheet is in contact with the shell assembly. The application provides the grounding protection explosion-proof plug, expands the form of the grounding protection of the connector, and solves the technical problems of the small space of the electric connector assembly, the difficulty in realizing the grounding and the instability of the grounding in the prior art.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrical connectors, in particular to a grounding protection explosion-proof plug capable of working in a combustible gas and dust environment. BACKGROUND

[0002] With the continuous development of electrical connectors, their functions are constantly improved. The functions of oil and chemical electrical connectors are particularly complex. Not only do they require the connectors and assemblies to meet the requirements of air tightness and water tightness, but also require the connectors themselves to have the ability of foolproof, explosion-proof, electromagnetic shielding and grounding protection. These are the problems that need to be solved in the prior art.

[0003] The connector itself generates a certain amount of static electricity during long-term use. In addition, when the connector fails, the shell may be electrified. In order to prevent the shell of the connector from being electrified, the grounding protection design of the explosion-proof connector is particularly important. It can effectively prevent the operator from being electrocuted, ensure the safe use of the product, and ensure the safety of the personnel. SUMMARY

[0004] The present application overcomes the shortcomings of the prior art and provides a grounding protection explosion-proof plug, which expands the form of connector grounding protection and solves the technical problems of small space and unstable grounding of electrical connector assemblies in the prior art.

[0005] To achieve the above purpose, the technical solution adopted by the present application is as follows: a grounding protection explosion-proof plug, comprising a middle-through outer shell assembly, a base assembly is arranged in the outer shell assembly, and a plurality of crimp assemblies are arranged in the base assembly; the base assembly further comprises a mounting seat embedded in the outer shell assembly, and a plurality of crimp assemblies are fixedly arranged on the mounting seat; the crimp assembly comprises a plurality of butt plug pins and a grounding plug pin assembly; the grounding plug pin assembly comprises a grounding plug pin and a grounding spring sheet arranged on the grounding plug pin; and the grounding spring sheet is in contact with the outer shell assembly.

[0006] In a preferred embodiment of the present application, the outer shell assembly comprises an upper shell and a lower shell that can be mutually butted and combined; one end of the base assembly is arranged in the upper shell, and at least part of the mounting seat is limitingly embedded in the upper shell; the other end of the base assembly is arranged in the lower shell, and at least part of the mounting seat is embedded in the lower shell; and one end of the upper shell and the lower shell embedded with the mounting seat can be sleeved and combined.

[0007] In a preferred embodiment of the present application, the plug pin or the grounding plug pin comprises a sealing segment, and elastic contact segments are arranged at both ends of the sealing segment, and a cable crimping segment for butt joint with a cable.

[0008] In a preferred embodiment of the present application, the mounting seat comprises an upper base and a lower base sleeved on the crimping joint, and a rubber base is arranged between the upper base and the lower base; the crimping joint is fixed on the upper base, the rubber base and the lower base in a limiting manner;

[0009] The rubber base is sleeved on the sealing section, an upper base is sleeved on one end of the elastic contact section in abutment with the rubber base, and a lower base is sleeved on one end of the cable crimping section in abutment with the rubber base.

[0010] In a preferred embodiment of the present application, a plurality of petal-shaped grooves are formed on the top of the elastic contact section of the grounding pin, the plurality of petal-shaped grooves separate the elastic contact section into a plurality of elastic pieces, and the elastic pieces are in a fan-shaped structure in a sectional view; and the elastic contact section is in a flared structure.

[0011] In a preferred embodiment of the present application, the grounding spring piece comprises a mounting end, and an outer edge of the mounting end is provided with a grounding piece, and the mounting end and the grounding piece are in an arc-shaped bending structure.

[0012] Specifically, the maximum outer diameter of the top of the elastic contact section, and the plurality of petal-shaped grooves of the grounding pin are in a plurality of petal-shaped groove structures. For example, three petal-shaped grooves or four petal-shaped grooves, but not limited to this, the petal-shaped groove structure of the plurality of petal-shaped grooves can be other numbers. More specifically, the top of the elastic contact section is provided with a slope, and the slope of the elastic contact section and the straight section of the elastic contact section are connected by an R angle, the slope of the rubber sealing section and the elastic contact section are connected by a slope, the slope and the rubber sealing section and the elastic contact section are connected by an R angle, and the middle of the rubber sealing section is provided with a sealing groove for limiting combination with the rubber base. The cable crimping section of the grounding pin is provided with a blind hole machined from the tail of the pin, a rectangular structure penetrates one side of the wall of the crimping hole, the rectangular structure is connected by an arc section to form an overstep area, to avoid perpendicular angles and sharp angles, to form a half playground structure type slot, and the slot width of the crimping groove is slightly larger than the width of the crimping terminal.

[0013] Further, the grounding pin is similar to the pin structure, the grounding pin is provided with a half-ring-shaped welding groove on the sealing groove, the length of the elastic contact section of the grounding pin is longer than the length of the elastic section of the grounding pin, the maximum outer diameter of the elastic contact section of the grounding pin is smaller than the maximum outer diameter of the elastic contact section of the grounding pin, the length of the rubber sealing section of the grounding pin is equal to the length of the sealing section of the grounding pin plus the thickness of the grounding spring piece, the tail of the sealing section of the grounding pin is provided with a half-ring-shaped welding groove, and the width of the welding groove is slightly larger than the thickness of the grounding spring piece.

[0014] Specifically, the grounding spring piece includes a mounting end, an outer edge of the mounting end is provided with a grounding sheet, and the mounting end and the grounding sheet adopt an arc bending structure. A maximum diameter of the grounding spring piece is equal to or slightly greater than a diameter of the upper shell tail grounding ring groove, so as to ensure that the grounding spring piece is in elastic contact with the upper shell tail grounding ring groove. The grounding spring piece is a welding end; the welding end is provided with a semicircular notch, and a diameter of the semicircular notch is the same as that of the semicircular welding groove of the grounding pin. The grounding sheet adopts a groove sheet combined structure. More specifically, the grounding sheet adopts a three-groove four-sheet structure. The three grooves of the grounding sheet are rectangular grooves.

[0015] The combined structure of the grounding pin and the grounding spring piece is a grounding pin assembly, the grounding pin assembly is matched by the semicircular notch of the grounding spring piece and the semicircular welding groove provided on the sealing groove of the grounding pin. The mounting end of the grounding spring piece is partially embedded in the semicircular welding groove of the grounding pin, and the upper end surface of the grounding spring piece is matched with the lower end surface of the rubber sealing section of the grounding pin, and the two are connected by brazing.

[0016] In a preferred embodiment of the present application, the butt joint pin or / and the grounding pin of the crimping assembly is provided with a crimping terminal; the cable crimping section is provided with a crimping groove, the outer part of the cable crimping section is provided with a wire pressing terminal, and the wire pressing terminal includes a sheath, a rivet and a wire pressing plate; the sheath is at least partially sleeved in the crimping groove, the sheath is provided with a through hole corresponding to the crimping groove, the rivet is arranged in the through hole, one end of the rivet is connected to the outer side of the wire pressing plate movably embedded in the through hole, and the inner side of the wire pressing plate is a pressing side.

[0017] Specifically, the tail of the cable crimping section of the butt joint pin or the grounding pin is arranged in the sheath, the wire pressing plate is arranged in the wire pressing section of the pin tail, the wire pressing plate is moved radially in the wire pressing section of the pin tail by the rivet, when the wire is crimped, the wire is arranged in the pin wire pressing hole, the wire pressing plate presses the wire, the hexagonal wrench drives the rivet, the threaded step surface of the rivet presses the upper end surface of the wire pressing plate, the threaded surface of the rivet presses the sheath, and as the torque increases, the serrated surface of the wire pressing plate is constantly pressed against the wire, so as to effectively ensure the crimping strength of the wire. The wire pressing terminal is matched with the inner thread of the sheath through the outer thread of the rivet, the wire pressing plate is connected with the rivet by riveting, the wire pressing plate and the rivet can rotate freely after riveting, and the wire pressing plate and the rivet are arranged in the through hole of the sheath after riveting, and the rivet is screwed out of the inner threaded hole of the through hole of the sheath.

[0018] In a preferred embodiment of the present application, the upper shell and the lower shell adopt a middle-through pipe structure; the lower end of the upper shell is embedded into the upper end of the upper shell, and the mounting seat is embedded at the joint of the upper shell and the lower shell; the end of the lower shell that is in abutment with the upper shell is sleeved outside the mounting seat; the shell assembly further comprises a locking sleeve that is sleeved outside the upper shell and the lower shell; the elastic contact section of the crimping assembly is embedded in the upper shell, and the cable crimping section of the crimping assembly is embedded in the lower shell.

[0019] In a preferred embodiment of the present application, one end of the lower shell is embedded with the base assembly, the other end of the lower shell is provided with a tail wire clamp, and a locking tail cover is arranged between the tail wire clamp and the lower shell; the tail wire clamp is provided with a cable that is in abutment with the cable crimping section.

[0020] In a preferred embodiment of the present application, an abutment gap is further reserved between the upper shell and the locking sleeve; one end of the upper shell is embedded with the base assembly, the other end of the upper shell is provided with a dustproof cover that can be opened and closed relative to the upper shell and the base assembly; the dustproof cover is provided with a blind hole that can be sleeved on the upper shell, and the hole wall of the dustproof cover can be inserted and embedded into the abutment gap between the upper shell and the locking sleeve; and the outer end of the dustproof cover is provided with a bolted part.

[0021] Specifically, the upper shell is a circular tube shell, the inner side of the top of the upper part of the upper shell is provided with an inner inclined surface, the upper surface of the outer shell is provided with a long key one, the annular groove one between the long key one and the annular boss one of the upper shell is used for placing a sealing outer ring, the inner hole of the upper shell is provided with an inner boss and an annular groove two respectively, the tail part of the inner hole is provided with two sections of long keys two, the long keys two are adjacent to the tail inclined ring groove of the upper shell, and the tail part of the outer surface of the upper shell is provided with an explosion-proof external thread. The pitch of the explosion-proof external thread of the upper shell is ≥1.25mm, the thread angle is 60°±5°, the effective number of teeth is ≥7 teeth, and the explosion-proof external thread is connected with the annular boss one through the relief groove one. Among them, the inner inclined surface of the top end, the relief groove one, the explosion-proof external thread, the lower end surface of the annular boss one, the inner annular groove two, and the end surface of the tail part of the upper shell are conductive areas, and the remaining surfaces adopt existing technology spraying or chemical treatment to form non-conductive areas.

[0022] Specifically, the lower shell is a circular tube shell, and the inner hole top of the middle passage of the lower shell is sequentially provided with an explosion-proof internal thread, a second tool withdrawal groove, a second annular boss, a second inner groove, a second inclined surface, an inner annular surface, a first inclined surface and a second inclined surface. The outer surface of the lower shell is sequentially provided with a first step, a second step and a tail outer thread from the top to the tail. The circumferential direction of the second step is subjected to knurling treatment and milling flattening treatment. The inner diameter of the second annular boss is smaller than the inner diameter of the explosion-proof internal thread. The pitch of the explosion-proof internal thread is greater than or equal to 1.25 mm, the thread angle is 60°±5°, and the effective number of teeth is greater than or equal to 7. The second annular boss is used to support the support ring, the support ring is placed inside the support ring and the second tool withdrawal groove, and the flame-retardant plastic tube is placed inside the second inner groove. The upper end face of the explosion-proof internal thread, the second tool withdrawal groove, the second annular boss, and the tail outer thread are all conductive areas, and the remaining areas are subjected to surface non-conductive treatment.

[0023] Specifically, the blind hole bottom of the dust cover is provided with an annular inclined boss along the blind hole root, the middle part of the blind hole wall is provided with an annular groove three, the annular groove three to the butt end face of the dust cover is provided with an inner groove three, and the angle between the inner groove three and the two long keys one of the upper shell is symmetrical about the axial direction and the radial direction. The axis is located in the middle of the inner groove three of the dust cover, the width and depth of the inner groove three of the dust cover are greater than the width and height of the long key one of the upper shell, the outer part of the dust cover is provided with an ACME thread or a rectangular thread, and the end face of the dust cover is provided with a bolted member for connecting with the cable. The end face of the dust cover and the bolted member adopt arc transition. The middle part of the bolted member is provided with an annular groove four, and the top of the bolted member is designed as a spherical surface. The slope surface of the annular inclined boss of the dust cover is a conductive area, and the remaining surfaces are non-conductive areas after being sprayed or chemically treated.

[0024] The preparation method of the grounding protection explosion-proof plug comprises the following steps:

[0025] Step one, assembly of the base assembly; the grounding pin assembly is composed of a grounding pin and a grounding spring; a plurality of butt pins and grounding pin assemblies are respectively provided with crimped terminals to form crimped assemblies, and a plurality of crimped assemblies and a mounting seat are fixedly combined to form a base assembly;

[0026] Step two, assembly of the base assembly with the upper shell and the lower shell.

[0027] The base assembly is embedded into the upper shell by connecting the cables introduced into the lower shell with the butt pins and the grounding pin assemblies of the base assembly, and the lower shell and the upper shell are butted and combined;

[0028] Step three, the locking sleeve is sleeved on the upper shell and the lower shell, and the locking sleeve is annularly connected and fixed outside the connection part of the upper shell and the lower shell.

[0029] Step four, when the connector is not working, the dust cover is locked with the locking sleeve, the explosion-proof surface of the dust cover and the explosion-proof surface of the upper shell gap cooperation form the explosion energy self-relaxation passage; or / and, when the connector is working, the upper shell peripheral long key to the end face ring is the explosion-proof surface, and the explosion-proof surface of the corresponding socket is matched through the fixed gap, forming the explosion energy self-relaxation passage, which ensures that the internal spark and high temperature of the plug and the counter socket do not pass through the shell assembly to the outside.

[0030] The installation ring groove on both sides of the sealing groove of the counter pin and the grounding pin assembly is matched and clamped with the upper end face and the lower end face of the rubber base respectively, the upper base is installed from the top of the counter pin and the grounding pin assembly, the lower end face of the upper base is matched with the upper end face of the rubber base, the lower base is installed from the tail of the counter pin and the grounding pin assembly, and the upper end face of the lower base is matched with the lower end face of the rubber base to form the base assembly; the wire pressing terminal is fixed with the tail wire hole of the pin to form the crimping assembly.

[0031] The corrugated check ring is placed in the inner annular groove two of the upper shell, the base assembly is installed in the upper shell, the corrugated check ring is matched with the annular step end face of the upper base of the base assembly, the upper base is matched with the upper shell through the long key groove and the key to prevent rotation between the two, the grounding spring sheet of the grounding pin assembly is clamped in the tail slope ring groove of the upper shell to electrically connect the grounding pin assembly and the upper shell; the upper shell and the lower shell are matched through the set explosion-proof thread to connect the explosion-proof and electrical structure between the upper shell and the lower shell. At the same time, the explosion-proof outer thread tail end face of the upper shell compresses the support ring pad to realize the sealing and thread explosion-proof between the upper shell and the lower shell, the upper shell is provided with a conductive bevel on the top, which is matched with the conductive bevel inside the dust cover, the inner boss upper surface of the locking sleeve is matched with the outer boss lower surface of the upper shell to realize electrical connection; the electrical connector between the grounding pin assembly, the upper shell, the lower shell, the dust cover and the locking sleeve.

[0032] The support ring and the support ring pad are installed in the top inner retreat knife groove two of the lower shell, and the support ring pad is located between the support ring and the retreat knife groove two of the lower shell. The tail end face of the upper shell is compressed with the end face of the support ring pad, the support ring supports the annular boss of the lower base, and the axial position of the base assembly, the upper shell and the lower shell is fixed.

[0033] The flame-retardant plastic pipe is installed in the inner groove two of the lower shell, the electrical isolation crimping terminal is matched with the lower shell, the inner groove two of the lower shell is increased with the electrical insulation gap between the crimping terminal and the lower shell, the tail rubber sleeve is installed in the tail hole of the lower shell, the tail outer thread of the lower shell is matched with the inner thread of the locking tail cover to lock, and the tail wire clamp is fixed through the locking screw and the locking nut.

[0034] The locking sleeve and the dust cover are threadedly connected, the upper step surface of the inner hole boss of the locking sleeve is in contact with the lower step surface of the outer boss of the upper shell, the top end surface of the dust cover is sealed by the sealing outer ring matched with the upper end surface of the outer boss of the upper shell, and the locking screw arranged on the locking sleeve is in contact with the lower shell.

[0035] The present application solves the defects in the background art, and has the following beneficial effects:

[0036] The present application is a grounding protection explosion-proof plug, which expands the form of connector grounding protection, solves the technical problems of difficulty in grounding and instability of grounding in the small space of the existing electric connector assembly. Moreover, all parts are detachable structures, and when local parts fail, they can be disassembled and local parts can be replaced, thereby reducing production cost.

[0037] 1. The grounding pin assembly realizes electrical connection between the shell and the grounding pin through the contact spring, and the electricity carried by the shell is poured into the grounding pin. The plug shell is a fully enclosed metal shell with certain shielding function. The electrical connection closed loop elastically extended to the periphery of the grounding pin is formed by the combination of the grounding pin and the contact spring, which improves the convenience and stability of electrical contact.

[0038] 2. The slotted pin and the grounding pin are respectively used as elastic contact pieces, and the traditional contact piece is a jack used as an elastic contact piece. The advantage of the present application lies in that according to the electrical contact theory, the greater the normal force generated by the contact piece of the same hardness material, the greater the effective contact area between the contact pieces, and the smaller the contact resistance. The present application can effectively reduce the contact resistance generated when the contact pieces are connected.

[0039] 3. The outer contact surface of the connector is subjected to electrical insulation treatment to avoid direct contact between the conductor and the contact person, and the contact connection part of the part is subjected to conductive treatment to ensure that the connector shell parts realize electrical connection through thread and end surface contact mode. BRIEF DESCRIPTION OF DRAWINGS

[0040] The present application will be further described below in combination with the drawings and examples.

[0041] Figure 1 is a split structure schematic diagram of the grounding protection explosion-proof plug of the preferred embodiment of the present application;

[0042] Figure 2 is a cross-sectional view of the plug structure of the grounding protection explosion-proof plug of the preferred embodiment of the present application;

[0043] Figure 3 is a cross-sectional view of the mating pin structure of the grounding protection explosion-proof plug of the preferred embodiment of the present application;

[0044] Figure 4 is the axial view schematic diagram of the mating pin structure of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0045] Figure 5 is the front view schematic diagram of the ground pin of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0046] Figure 6 is the schematic diagram of the ground spring of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0047] Figure 7 is the schematic diagram of the ground pin assembly of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0048] Figure 8 is the sectional view schematic diagram of the wire pressing terminal of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0049] Figure 9 is the sectional view schematic diagram of the dust cover of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0050] Figure 10 is the axial view schematic diagram of the dust cover of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0051] Figure 11 is the sectional view schematic diagram of the upper shell of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0052] Figure 12 is the axial view schematic diagram of the upper shell of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0053] Figure 13 is the sectional view schematic diagram of the lower shell of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0054] Figure 14 is the axial view schematic diagram of the lower shell of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0055] Figure 15 is the axial view schematic diagram of the assembly of the lower shell, the lower shell and the locking sleeve of the ground protection explosion-proof plug of the preferred embodiment of the present application;

[0056] In the figure: 1-mating pin; 101-elastic contact section one; 102-sealing section one; 103-cable pressing section one; 2-ground pin assembly; 201-ground pin; 2011-elastic contact section two; 2012-sealing section two; 2013-welding groove; 2014-cable pressing section two, 202-ground spring;

[0057] 3 - upper housing; 301 - inner inclined surface; 302 - long key one; 303 - annular boss one; 304 - annular groove one; 305 - inner boss; 306 - annular groove two; 307 - long key two; 308 - tail inclined surface groove; 309 - explosion-proof external thread; 310 - tool withdrawal groove one;

[0058] 4 - lower housing; 401 - explosion-proof internal thread; 402 - tool withdrawal groove two; 403 - annular boss two; 404 - inner groove two; 405 - inclined surface one; 406 - inner annular surface; 407 - inclined surface two; 408 - step one; 409 - step two; 410 - tail external thread;

[0059] 5 - upper base; 6 - lower base; 7 - rubber base; 8 - crimping terminal; 801 - sheath; 802 - rivet; 803 - crimping plate; 9 - dust cover; 901 - annular inclined boss; 902 - annular groove three; 903 - inner groove three; 904 - mating thread; 905 - bolted member; 10 - locking sleeve;

[0060] 11 - locking tail cover; 12 - tail rubber sleeve; 13 - tail wire clamp; 14 - corrugated retainer; 15 - stop screw; 16 - locking screw; 17 - locking nut; 18 - support ring; 19 - support ring pad; 20 - sealing outer ring; 21 - tail gasket; 22 - flame-retardant plastic tube. DETAILED DESCRIPTION

[0061] The application will be further described below in conjunction with the drawings and embodiments, which are all simplified schematic diagrams and only show the basic structure of the application in a schematic manner, and thus only show the components related to the application.

[0062] It should be noted that if the embodiments of the application involve directional indications (such as up-down-bottom-top, etc.), the directional indications are only used to explain the relative positional relationship between the components, the movement, etc. in a certain posture, and if the certain posture changes, the directional indications also change accordingly. The terms "first" and "second" are only for descriptive purposes and should not be understood as indicating or implying relative importance or implying the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. Unless otherwise specified and limited, the terms "provided", "connected", and "connected" should be broadly understood, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be connected inside two elements. For those skilled in the art, the specific meaning of the above terms in the application can be understood according to the specific circumstances. Embodiment one

[0063] AsFigures 1-15 As shown in the drawings, the grounding protection explosion-proof plug comprises a middle-through outer shell assembly, a base assembly is arranged in the outer shell assembly, the outer shell assembly comprises an upper shell 3 and a lower shell 4 which can be combined with each other, and the upper shell 3 and the lower shell 4 are combined with each other at one end of the upper shell 3 and the lower shell 4.

[0064] Specifically, as shown in the drawings, Figure 1 , Figure 2 , Figure 11 , Figure 12 The upper shell 3 is a circular tube shell, an inner inclined surface 301 is arranged at the top of the upper shell 3, a long key one 302 is arranged at the upper surface of the outer shell, an annular groove one 304 is arranged between the long key one 302 and an annular boss one 303 of the upper shell 3, and the annular groove one 304 is used for placing a sealing outer ring 20, an inner boss 305 and an annular groove two 306 are respectively arranged in the middle-through inner hole of the upper shell 3, two long keys two 307 are arranged at the tail of the inner hole, the long keys two 307 are adjacent to a tail inclined surface ring groove 308 of the upper shell 3, and an explosion-proof outer thread 309 is arranged at the tail of the outer surface of the upper shell 3. The pitch of the explosion-proof outer thread 309 of the upper shell 3 is greater than or equal to 1.25 mm, the thread angle is 60°±5°, the effective thread number is greater than or equal to 7, and the explosion-proof outer thread 309 is connected with the annular boss one 303 through a tool withdrawal groove one 310. Among them, the top end inner inclined surface 301, the tool withdrawal groove one 310, the explosion-proof outer thread 309, the lower end surface of the annular boss one 303, the inner annular groove two 306, and the tail end surface of the upper shell 3 are conductive areas, and the remaining surfaces are non-conductive areas by existing technology spraying or chemical treatment.

[0065] Specifically, as shown in the drawings, Figure 1 , Figure 2 , Figures 13-15 The lower shell 4 is a circular tube shell, an explosion-proof inner thread 401, a tool withdrawal groove two 402, an annular boss two 403, an inner groove two 404, an inclined surface two 407, an inner annular surface 406, an inclined surface one 405, and the inclined surface two 407 are sequentially arranged at the top of the middle-through inner hole of the lower shell 4. A step one 408, a step two 409, and a tail outer thread 410 are sequentially arranged at the outer surface of the lower shell 4 from the top to the tail. Among them, the circumferential surface of the step two 409 is subjected to knurling treatment and flat milling treatment. The inner diameter of the annular boss two 403 is less than the inner diameter of the explosion-proof inner thread 401. The pitch of the explosion-proof inner thread 401 is greater than or equal to 1.25 mm, the thread angle is 60°±5°, and the effective thread number is greater than or equal to 7. The annular boss two 403 is used for supporting a support ring 18, a support ring gasket 19 is arranged in the inner part of the support ring 18 and the tool withdrawal groove two 402, a flame-retardant plastic tube 22 is arranged in the inner groove two 404, and elastic abutting sealing is achieved through a tail gasket 21. The explosion-proof inner thread 401, the tool withdrawal groove two 402, the upper end surface of the annular boss two 403, and the tail outer thread 410 are conductive areas, and the remaining areas are subjected to surface non-conductive treatment.

[0066] Specifically, as shown in Figure 1 , Figure 2 , Figure 9 , Figure 10 , the bottom of the blind hole of the dust cover 9 is provided with an annular inclined slope boss 901 along the root of the blind hole, the middle part of the blind hole wall is provided with an annular groove three 902, the annular groove three 902 to the butt end face of the dust cover 9 is provided with an inner groove three 903, and the angle of the inner groove three 903 and the two long keys one 302 of the upper shell 3 is symmetrical about the axial and radial directions. The axis is located in the middle of the inner groove three 903 of the dust cover 9, the width and depth of the inner groove three 903 of the dust cover 9 are greater than the width and height of the long key one 302 of the upper shell 3, the outer part of the dust cover 9 is provided with ACME thread or rectangular thread, and the end face of the dust cover 9 is provided with a bolted part 905 for connecting with the cable. The bolted part 905 and the end face of the dust cover 9 adopt arc transition. The middle part of the bolted part 905 is provided with an annular groove four, and the top of the bolted part 905 is designed as a spherical surface; wherein the slope surface of the annular inclined slope boss 901 of the dust cover 9 is a conductive area, and the rest of the surface is sprayed or chemically treated into a non-conductive area.

[0067] Specifically, as shown in Figure 1 , Figure 2 , the base assembly includes a mounting seat arranged in the shell assembly, and a plurality of crimping assemblies fixedly penetrating the mounting seat. The mounting seat includes an upper base 5 and a lower base 6 sleeved on the crimping assemblies, and a rubber base 7 is arranged between the upper base 5 and the lower base 6; the crimping assemblies are fixedly penetrated into the upper base 5, the rubber base 7 and the lower base 6. Moreover, one end of the crimping assembly penetrates into the upper shell 3, and at least part of the mounting seat is limitingly arranged in the upper shell 3; the other end of the crimping assembly penetrates into the lower shell 4, and at least part of the mounting seat is limitingly arranged in the lower shell 4.

[0068] Specifically, as shown in Figures 1-8 , the plurality of crimping assemblies include a plurality of butt plug pins 1 and a grounding plug pin assembly 2. The grounding plug pin assembly 2 includes a grounding plug pin 201 and a grounding spring 202 arranged on the grounding plug pin 201; the grounding spring 202 is in contact with the shell assembly. The butt plug pin 1 and the grounding plug pin 201 both include a sealing segment, and the two ends of the sealing segment are respectively provided with an elastic contact segment and a cable crimping segment for butt joint with the cable.

[0069] Specifically, as shown in Figures 1-8 , the top of the elastic contact segment of the butt plug pin 1 and the grounding plug pin 201 is provided with a multi-petal slot, which divides the elastic contact segment into a plurality of elastic pieces, and the cross-sectional view of the elastic piece is a fan-shaped structure; and the elastic contact segment is in a horn mouth structure. The grounding spring 202 includes a mounting end, and the outer edge of the mounting end is provided with a grounding sheet, and the mounting end and the grounding sheet adopt an arc bending structure. More specifically, as shown in Figure 3 andFigure 4 The top outer diameter of the elastic contact section is the largest, and the multi-lobe groove of the butt plug pin 1 and the grounding plug pin 201 is a multi-lobe groove structure. The top of the multi-lobe groove is processed in a flared manner. For example, three-lobe or four-lobe, but not limited to this, the lobe structure of the multi-lobe groove can be other quantities. The top of the elastic contact section is provided with a slope, and the slope of the elastic contact section is connected to the straight section of the elastic contact section by an R angle. The rubber sealing section and the elastic contact section are connected by a slope, and the slope and the rubber sealing section and the elastic contact section are connected by an R angle. The middle of the rubber sealing section is provided with an annular groove four for limiting combination with the rubber base 7. The cable crimping section of the butt plug pin 1 and the grounding plug pin 201 is provided with a blind hole processed from the tail of the plug pin. A rectangular structure penetrates one side of the wall of the crimping hole. The rectangular structure is connected by an arc section to avoid vertical angles and sharp angles, forming a half playground structure slot, i.e. a crimping groove. The width of the crimping groove is slightly larger than the width of the crimping terminal plate 803. The maximum outer diameter of the elastic contact section is greater than the hole diameter of the corresponding butt plug hole. In order to achieve a certain angle of the elastic contact section, the maximum outer diameter of the elastic contact section is greater than the hole diameter of the corresponding butt plug hole, not only limited to the flared processing of the top of the plug pin, but also can be processed by machining and integrated.

[0070] Specifically, as shown in Figure 1 , Figure 2 , Figures 4-7 The grounding plug pin 201 of the grounding plug pin assembly 2 is similar in structure to the plug pin. The sealing section of the grounding plug pin 201 is provided with a semi-annular welding groove 2013. The length of the elastic contact section of the grounding plug pin 201 is longer than the length of the elastic section of the butt plug pin 1, and the maximum outer diameter of the elastic contact section is smaller than the maximum outer diameter of the elastic contact section of the butt plug pin 1. The length of the rubber sealing section of the grounding plug pin 201 is equal to the length of the sealing section of the butt plug pin 1 plus the thickness of the grounding spring sheet 202. The sealing section of the grounding plug pin 201 is provided with a semi-annular welding groove 2013, and the width of the welding groove 2013 is slightly larger than the thickness of the grounding spring sheet 202. More specifically, as shown in Figure 5 The grounding spring sheet 202 of the grounding plug pin assembly 2 includes a mounting end, and the outer edge of the mounting end is provided with a grounding sheet. The mounting end and the grounding sheet adopt an arc bending structure. The maximum diameter of the grounding spring sheet 202 is equal to or slightly larger than the diameter of the tail grounding ring groove of the upper shell 3, so as to ensure the elastic contact between the grounding spring sheet 202 and the tail grounding ring groove of the upper shell 3. The welding end of the grounding spring sheet 202 is provided with a semicircular notch, and the diameter of the semicircular notch is the same as the diameter of the semi-annular welding groove 2013 on the grounding plug pin 201. The grounding sheet adopts a groove sheet combination structure. The grounding sheet adopts a three-groove four-sheet structure. The three grooves of the grounding sheet are rectangular grooves. Further, as shown in Figure 6As shown, the ground pin assembly 2 is matched by the semicircular notch of the ground spring 202 and the semicircular welding groove 2013 provided on the sealing segment of the ground pin 201. The sealing segment is a groove with annular structure. The mounting end of the ground spring 202 is embedded in the semicircular welding groove 2013 of the ground pin 201, and the upper end surface of the ground spring 202 is matched with the lower end surface of the rubber sealing segment of the ground pin 201, which are connected by brazing.

[0071] Here, in order to distinguish on the drawings of the specification, the sealing segment, the elastic contact segment and the cable crimping segment of the ground pin 201 of the mating plug pin 1 will be distinguished. The mating plug pin 1 includes a sealing segment one 102, and the two ends of the sealing segment one 102 are respectively provided with an elastic contact segment one 101 and a cable crimping segment one 103 for mating with the cable. The ground pin 201 includes a sealing segment two 2012, and the two ends of the sealing segment two 2012 are respectively provided with an elastic contact segment two 2011 and a cable crimping segment two 2014 for mating with the cable. Further, the rubber base 7 is sleeved on the sealing segment one 102 and the sealing segment two 2012, and the elastic contact segment one 101 and the elastic contact segment two 2011 are respectively sleeved with the upper base 5 on the one end of the rubber base 7; the cable crimping segment one 103 and the cable crimping segment two 2014 are sleeved with the lower base 6 on the one end of the rubber base 7.

[0072] Further, the butt plug 1 or / and the grounding plug 201 of the crimping connector is provided with a crimping terminal; the cable crimping section is provided with a crimping groove, and the cable crimping section is externally sleeved with a wire pressing terminal 8, and the wire pressing terminal 8 comprises a sheath 801, a rivet 802 and a wire pressing plate 803; the sheath 801 is at least partially sleeved outside the crimping groove, the sheath 801 is provided with a through hole corresponding to the crimping groove, the rivet 802 is arranged in the through hole, one end of the rivet 802 is arranged outside the wire pressing plate 803 movably arranged in the through hole, and the inner side of the wire pressing plate 803 is a pressing side. During installation, the tail of the cable crimping section of the butt plug 1 or the grounding plug 201 is arranged inside the sheath 801, the wire pressing plate 803 is arranged inside the plug tail wire pressing section, the wire pressing plate 803 is driven by the rivet 802 to realize radial movement of the wire pressing plate 803 in the plug tail wire pressing section, during crimping of the wire, the wire is arranged in the plug wire pressing hole, the wire pressing plate 803 presses the wire, the hexagonal wrench drives the rivet 802, the threaded step surface of the rivet 802 abuts against the upper end surface of the wire pressing plate 803, the threaded surface of the rivet 802 abuts against the sheath 801, and as the torque increases, the serrated surface of the wire pressing plate 803 is continuously pressed against the wire, so that the crimping strength of the wire can be effectively ensured. The wire pressing terminal 8 is matched with the internal thread of the sheath 801 through the external thread of the rivet 802, the wire pressing plate 803 is connected to the rivet 802 through riveting, the wire pressing plate 803 and the rivet 802 can freely rotate after riveting, and the wire pressing plate 803 and the rivet 802 are arranged in the through hole of the sheath 801 after riveting, and the rivet 802 is screwed out of the internal thread hole of the through hole of the sheath 801.

[0073] As shown in Figure 8 , the wire pressing terminal 8 is matched with the internal thread of the sheath 801 through the external thread of the rivet 802, the wire pressing plate 803 is connected to the rivet 802 through riveting, the wire pressing plate 803 and the rivet 802 can freely rotate after riveting, the wire pressing plate 803 and the rivet 802 are arranged in the through hole of the sheath 801 after riveting, and the rivet 802 is screwed out of the internal thread hole of the through hole of the sheath 801; the crimping connector is composed of the plug or the grounding plug 201 and the crimping terminal, the plug tail wire pressing section is arranged inside the sheath 801, the wire pressing plate 803 is arranged inside the plug tail wire pressing section, the wire pressing plate 803 is driven by the rivet 802 to realize radial movement of the wire pressing plate 803 in the plug tail wire pressing section, during crimping of the wire, the cable is arranged in the through hole of the sheath 801, that is, in the crimping groove of the cable wire pressing section, the wire pressing plate 803 presses the wire, the hexagonal wrench drives the rivet 802, the threaded step surface of the rivet 802 abuts against the upper end surface of the wire pressing plate 803, the threaded surface of the rivet 802 abuts against the sheath 801, and as the torque increases, the serrated surface of the wire pressing plate 803 is continuously pressed against the wire, so that the crimping strength of the wire can be effectively ensured.

[0074] The upper shell 3 and the lower shell 4 adopt a middle-through pipe body structure; the lower end of the upper shell 3 is embedded into the upper end of the upper shell 3, and the mounting seat is embedded at the joint of the upper shell 3 and the lower shell 4; the end of the lower shell 4 abutting the upper shell 3 is sleeved outside the mounting seat; the shell assembly further comprises a locking sleeve 10 sleeved outside the upper shell 3 and the lower shell 4. The elastic contact section of the crimping assembly in the base assembly is embedded in the upper shell 3, and the cable crimping section of the crimping assembly in the base assembly is embedded in the lower shell 4. One end of the lower shell 4 is embedded with the base assembly, and the other end of the lower shell 4 is provided with a tail wire clamp 13, and the tail wire clamp 13 and the lower shell 4 are provided with a locking tail cover 11, and the tail wire clamp 13 is provided with a cable abutting the cable crimping section. The abutting gap is reserved between the upper shell 3 and the locking sleeve 10; one end of the upper shell 3 is embedded with the base assembly, and the other end of the upper shell 3 is provided with a dust cover 9 which can be opened and closed relative to the upper shell 3 and the base assembly; the dust cover 9 is provided with a blind hole which can be sleeved on the upper shell 3, and the hole wall of the dust cover 9 can be inserted and embedded into the abutting gap between the upper shell 3 and the locking sleeve 10; and the outer end of the dust cover 9 is provided with a bolted part 905. Example two

[0075] A preparation and assembly method of a grounding protection explosion-proof plug, comprising the following steps:

[0076] Step one, assembly of the base assembly.

[0077] The grounding pin assembly 2 is composed of a grounding pin 201 and a grounding spring 202 by welding; a plurality of abutting pins 1 and the grounding pin assembly 2 are respectively provided with crimping terminals to form crimping assemblies, and the crimping assemblies and the mounting seat are fixedly combined to form the base assembly.

[0078] Further, specifically, the mounting ring grooves on both sides of the annular groove four of the abutting pin 1 and the grounding pin assembly 2 are respectively matched and clamped with the upper end face and the lower end face of the rubber base 7, the upper base 5 is loaded from the top of the abutting pin 1 and the grounding pin assembly 2, the lower end face of the upper base 5 is matched with the upper end face of the rubber base 7, the lower base 6 is loaded from the tail of the abutting pin 1 and the grounding pin assembly 2, and the upper end face of the lower base 6 is matched with the lower end face of the rubber base 7 to form the base assembly; the assembly of the crimping assembly is composed of a sheath 801, a crimping plate 803 and a rivet 802 by the crimping terminal 8, and the crimping terminal 8 is fixed with the tail crimping hole of the pin by the mortise point to form the crimping assembly.

[0079] Step two, assembly of the base assembly with the upper shell 3 and the lower shell 4.

[0080] The base assembly is embedded into the upper shell 3 by connecting the abutting pin 1 and the grounding pin assembly 2 of the base assembly with the cable introduced into the lower shell 4, and the lower shell 4 is combined with the upper shell 3.

[0081] Further, the corrugated check ring 14 is placed in the annular groove two 306 inside the upper shell 3, the base assembly is installed in the upper shell 3, the corrugated check ring 14 cooperates with the annular step end face of the upper base 5 of the base assembly, the upper base 5 and the upper shell 3 are prevented from rotating by the long key groove and the long key one cooperation, the grounding spring 202 of the grounding pin assembly 2 is clamped in the tail slope ring groove 308 of the upper shell 3, and the electrical connection between the grounding pin assembly 2 and the upper shell 3 is achieved; the upper shell 3 and the lower shell 4 are connected by the explosion-proof threads arranged therebetween, and the explosion-proof and electrical connection between the upper shell 3 and the lower shell 4 is achieved. At the same time, the explosion-proof outer thread 309 of the upper shell 3 compresses the support ring pad 19 at the tail end face, realizing the sealing and explosion-proof thread between the upper shell 3 and the lower shell 4. The upper shell 3 is provided with a conductive bevel at the top, which cooperates with the conductive bevel inside the dust cover 9. The upper surface of the inner boss of the locking sleeve 10 cooperates with the lower surface of the outer boss of the upper shell 3, realizing the electrical connection; the electrical connectors between the grounding pin assembly 2, the upper shell 3, the lower shell 4, the dust cover 9 and the locking sleeve 10 are connected.

[0082] Specifically, the support ring 18 and the support ring pad 19 are arranged at the top of the lower shell 4 and the retreat groove two 402, and the support ring pad 19 is located between the support ring 18 and the retreat groove two 402 of the lower shell 4. The tail end face of the upper shell 3 compresses the end face of the support ring pad 19, and the support ring 18 supports the annular boss of the lower base 6, realizing the axial position fixation between the base assembly, the upper shell 3 and the lower shell 4.

[0083] Specifically, the flame-retardant plastic tube 22 is installed in the inner groove two 404 of the lower shell 4, and the electrically isolated crimping terminal is connected with the lower shell 4. The design of the inner groove two 404 of the lower shell 4 increases the electrical insulation gap between the crimping terminal and the lower shell 4. The tail rubber sleeve 12 is arranged in the tail hole of the lower shell 4. The tail outer thread 410 of the lower shell 4 cooperates with the inner thread of the locking tail cover 11 to realize locking. The tail wire clamp 13 is fixed by the locking screw 16 and the locking nut 17.

[0084] Step three, the locking sleeve 10 is sleeved on the upper shell 3 and the lower shell 4, and the locking sleeve 10 is fixed at the joint of the upper shell 3 and the lower shell 4 outside.

[0085] The locking sleeve 10 cooperates with the dust cover 9 through threads, the upper step surface of the inner hole boss of the locking sleeve 10 cooperates with the lower step surface of the outer boss of the upper shell 3, the top end face of the dust cover 9 cooperates with the upper end face of the outer boss arranged on the upper shell 3 through the sealing ring 20 to realize sealing, and the locking screw 15 arranged on the locking sleeve 10 cooperates with the lower shell 4 to realize locking.

[0086] Step four, when the connector is not working, the dust cover 9 is locked with the locking sleeve 10, the explosion-proof surface of the dust cover 9 and the explosion-proof surface of the upper shell 3 gap fit to form an explosion energy self-relaxation passage; or / and, when the connector is working, the outer long key of the upper shell 3 to the end face ring is the explosion-proof surface, and then the explosion-proof surface of the corresponding socket is gap fit through the fixing, forming an explosion energy self-relaxation passage, ensuring that the internal spark and high temperature of the plug and the corresponding socket do not pass through the shell assembly to the outside.

[0087] Working principle:

[0088] As shown in Figures 1-15 All parts of the present application are detachable structure, when a part fails, it can be disassembled and replaced, reducing production cost. At the same time, the outer contact surface of the connector is treated by electrical insulation to avoid direct contact between the conductor and the contact person, and the contact connection part of the part is treated by electrical conduction to ensure that the connector shell parts realize electrical connection through thread and end surface contact. The slotted butt plug 1 and the grounding plug 201 are respectively used as elastic contact pieces, and the traditional contact piece is used as a plug as an elastic contact piece. According to the electrical contact theory, the greater the normal force generated by the contact piece of the same hardness material, the greater the effective contact area between the contact pieces, and the smaller the contact resistance. The present application can effectively reduce the contact resistance generated when the contact pieces are connected. The upper shell and the lower shell of the shell assembly of the plug are metal shell full enclosed type, and have certain shielding function. The grounding spring piece 202 is combined with the grounding plug 201 to form an electrically connected closed loop which is elastically extended to the periphery of the grounding plug 201, improving the convenience and stability of electrical contact.

[0089] The explosion-proof plug of the present application is mainly applied in explosive gas environment and explosive dust environment. The dust cover 9 and the upper shell 3 are sealed by the sealing ring 20. When not in use, the dust cover 9 is not removed, the locking sleeve 10 is locked with the dust cover 9, and there are two stop screws on the locking sleeve 10, which contact and stop with the lower shell. When in use, the dust cover 9 is removed to connect the explosion-proof plug with the corresponding socket.

[0090] The outer periphery long protruding key 302 of the upper shell 3 is called an explosion-proof surface, and is matched with the explosion-proof surface of the corresponding socket through a fixed gap to form a path for explosion energy dissipation, so that the internal electric spark and high temperature of the plug and the socket do not ignite explosion and are not transmitted to the outside through the shell assembly. In addition, the inner periphery groove of the dust cover 9 to the outer periphery surface of the dust cover 9 is an explosion-proof surface. When the connector is not working, the dust cover 9 is locked with the locking sleeve 10, and the explosion-proof surface of the dust cover 9 is matched with the explosion-proof surface of the upper shell 3 to form a path for explosion energy dissipation. In addition, the sealing ring 20 on the outside of the upper shell 3 ensures that the explosion energy is not transmitted to the outside of the shell assembly, causing external explosion, thereby playing a role in explosion-proof. The grounding pin 201 and the grounding spring 202 are connected to the upper shell 3, and the upper shell 3 is electrically connected to the locking sleeve 10 and the lower shell 4 through threads and end faces, respectively, to lead the static electricity on the shell assembly to the outside. The plug in the application is a three-phase alternating current grounding protection, and the structure material is an aluminum alloy material which also plays a role in electromagnetic shielding. The all-metal structure can shield internal and external electromagnetic interference, the grounding pin 201 is connected to the upper shell 3 to lead the static electricity on the shell to the outside, protecting the safety of the operator, and the remaining several mating pins 1 are communication signals or power.

[0091] The above is based on the ideal embodiment of the application, and through the above description, relevant personnel can make various changes and modifications without deviating from the technical idea of the application. The technical scope of the application is not limited to the content of the specification, and must be determined according to the scope of the claims.

Claims

1. A grounding protection explosion-proof plug, comprising a central housing assembly, wherein a base assembly is disposed within the housing assembly, and a plurality of crimping members are disposed within the base assembly; characterized in that: The base assembly also includes a mounting base embedded in the outer shell assembly. A plurality of the press-fit components are passed through and fixed on the mounting base. Each press-fit component includes a plurality of mating pins and grounding pin assemblies. Each grounding pin assembly includes a grounding pin and a grounding spring plate disposed on the grounding pin. The grounding spring plate contacts and abuts against the outer shell assembly. Both the pin and the grounding pin include a sealing section, and each end of the sealing section is provided with an elastic contact section and a cable crimping section for connecting with the cable; the top of the elastic contact section of the connecting pin and the grounding pin is provided with a multi-lobed groove, which divides the elastic contact section into several spring pieces, and the spring pieces have a fan-shaped cross-sectional view; and the elastic contact section has a flared structure. The mounting base includes an upper base and a lower base sleeved on the press-fit member, and a rubber base is provided between the upper base and the lower base; the press-fit member is limited and fixed on the upper base, the rubber base, and the lower base; The rubber base is sleeved on the sealing section, and an upper base is sleeved on the end of the elastic contact section that connects with the rubber base; a lower base is sleeved on the end of the cable crimping section that connects with the rubber base. The grounding spring includes a mounting end, and a grounding piece is provided on the outer edge of the mounting end. The mounting end and the grounding piece adopt an arc-shaped bending structure.

2. The explosion-proof plug for grounding protection according to claim 1, characterized in that: The outer shell assembly includes an upper shell and a lower shell that can be docked and assembled with each other; One end of the base assembly is inserted into the upper housing, and at least part of the mounting seat is limited and embedded in the upper housing; The other end of the base assembly passes through the lower housing, and at least part of the mounting seat is embedded in the lower housing; Furthermore, one end of the upper housing and the lower housing, which are fitted with the mounting base, can be sleeved together.

3. The grounding protection explosion-proof plug according to claim 2, characterized in that: The mating pins and / or grounding pins of the crimping connector are provided with crimp terminals; the cable crimping section is provided with a crimp groove, and the cable crimping section is externally fitted with a wire crimp terminal, and the wire crimp terminal includes a sheath, a rivet, and a wire crimping plate; the sheath is at least partially fitted inside the crimp groove, and the sheath is provided with a through hole corresponding to the crimp groove, and a rivet is provided in the through hole, one end of the rivet passing through the through hole and connecting to the outside of the wire crimping plate movably embedded in the through hole, the inside of the wire crimping plate being the pressing side.

4. The explosion-proof grounding protection plug according to claim 3, characterized in that: The upper shell and the lower shell adopt a through-tube structure; The lower end of the upper housing is embedded in the upper end of the upper housing, and the mounting base is embedded at the junction of the upper housing and the lower housing; One end of the lower housing that connects with the upper housing is sleeved outside the mounting base; The outer shell assembly also includes a locking sleeve that is limited and sleeved outside the upper shell and the lower shell; the elastic contact section of the crimping member of the base assembly is embedded in the upper shell, and the cable crimping section of the crimping member of the base assembly is embedded in the lower shell. One end of the lower housing is fitted with the base assembly, and the other end of the lower housing is provided with a tail clamp, and a locking tail cover is provided between the tail clamp and the lower housing. A cable that is connected to the cable crimping section is passed through the tail clamp.

5. The explosion-proof grounding protection plug according to claim 4, characterized in that: A mating gap is reserved between the upper housing and the locking sleeve; one end of the upper housing is embedded with the base assembly, and the other end of the upper housing is provided with a dust cover that can be opened and closed relative to the upper housing and the base assembly; the dust cover is provided with a blind hole that can be fitted onto the upper housing, and the hole wall of the dust cover can be inserted into the mating gap between the upper housing and the locking sleeve; and the outer end of the dust cover is provided with a bolt.

6. A method for preparing a grounding protection explosion-proof plug, characterized in that: The method for preparing the grounding protection explosion-proof plug according to any one of claims 1 to 5 includes the following steps: Step 1: Assembly of the base assembly; The grounding pin assembly is made of grounding pins and grounding springs welded together; several mating pins and grounding pin assemblies are respectively equipped with crimp terminals and are combined to form crimped joints, and several crimped joints are fixedly combined with the mounting base to form a base assembly; Step two: Assembly of the base assembly with the upper and lower housings and the locking sleeve; The base assembly is embedded in the upper housing by connecting the cable introduced into the lower housing to the mating pin and grounding pin assembly of the base assembly, and then assembling the lower housing and the upper housing together. Step 3: The locking sleeve is fitted onto the upper and lower housings, and the locking sleeve is ring-fitted and fixed to the outside of the joint between the upper and lower housings; Step four: When the connector is not in operation, the dust cover and locking sleeve are locked together. The explosion-proof surface of the dust cover and the explosion-proof surface of the upper shell are fitted together with a gap to form a self-extinguishing path for the explosion energy; or / and, when the connector is in operation, the long protruding key on the outer periphery of the upper shell is an explosion-proof surface around its end face, and is fitted together with the explosion-proof surface of the corresponding socket with a fixed gap to form a self-extinguishing path for the explosion energy, ensuring that the internal electrical sparks and high-temperature ignition explosions of the plug and the mating socket are not transmitted to the outside through the outer shell assembly.

7. The method for preparing the grounding protection explosion-proof plug according to claim 6, characterized in that: The mounting ring grooves on both sides of the sealing groove of the mating pin and grounding pin assembly respectively engage and limit the upper and lower end faces of the rubber base. The upper base is inserted from the top of the mating pin and grounding pin assembly, and the lower end face of the upper base engages with the upper end face of the rubber base. The lower base is inserted from the tail of the mating pin and grounding pin assembly, and the upper end face of the lower base engages with the lower end face of the rubber base to form the base assembly. The crimp terminal is fixed to the crimp hole at the tail of the pin to form a crimped joint.

8. The method for preparing the grounding protection explosion-proof plug according to claim 6, characterized in that: The corrugated retaining ring is placed in the second annular groove inside the upper housing. The base assembly is installed into the upper housing. The corrugated retaining ring mates with the circumferential stepped end face of the upper base of the base assembly. The upper base and the upper housing are prevented from rotating by a long keyway and a convex key. The grounding spring of the grounding pin assembly is stuck in the sloping annular groove at the tail of the upper housing, connecting the grounding pin assembly to the upper housing. The upper housing and the lower housing are connected by explosion-proof threads for explosion-proof and electrical structural connection. The explosion-proof external thread end face of the upper housing is compressed with a support ring gasket to achieve sealing and thread explosion-proof between the upper and lower housings. The top of the upper housing is provided with a conductive bevel that matches the conductive bevel inside the dust cover. The upper surface of the inner boss of the locking screw sleeve matches the lower surface of the outer boss of the upper housing to achieve electrical connection. The electrical connector between the grounding pin assembly, the upper housing, the lower housing, the dust cover, and the locking sleeve is connected.

9. The method for preparing the grounding protection explosion-proof plug according to claim 6, characterized in that: The top of the lower housing has two relief grooves with support rings and support ring pads installed. The support ring pads are located between the support rings and the relief grooves of the lower housing. The tail end face of the upper housing and the end face of the support ring pads compress the support pads. The support rings support the circumferential boss of the lower base, thereby fixing the axial position of the base assembly, the upper housing, and the lower housing.

10. The method for preparing the grounding protection explosion-proof plug according to claim 6, characterized in that: Flame-retardant plastic tubes are inserted into two recesses in the lower housing. Electrically isolated crimp terminals are connected to the lower housing. An electrical insulation gap is added between the crimp terminals and the lower housing in the second recess of the lower housing. A tail rubber sleeve is installed in the tail hole of the lower housing. The external thread of the tail of the lower housing is locked in place with the internal thread of the locking tail cover. The tail clamp is fixed by a locking screw and a locking nut.

11. The method for preparing the grounding protection explosion-proof plug according to claim 6, characterized in that: The locking sleeve and the dust cover are threaded together. The upper stepped surface of the inner hole boss of the locking sleeve is in contact with the lower stepped surface of the outer boss of the upper housing. The top end face of the dust cover is sealed with the upper end face of the outer boss mounted on the upper housing through a sealing outer ring. The stop screw on the locking sleeve is in contact with the lower housing to stop the movement.

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