WO2022262482A1 - Ground protection explosion-proof plug - Google Patents

Abstract

Provided is a ground protection explosion-proof plug, comprising a through housing assembly. A base assembly is provided in the housing assembly, and several pressing assemblies are provided in the base assembly. The base assembly further comprises a mounting base embedded in the housing assembly, the several pressing assemblies are fixed on the mounting base in a penetrating manner, each pressing assembly comprises several butt-joint pins (1) and a ground pin assembly (2), and the ground pin assembly (2) comprises a ground pin (201) and a ground reed (202) provided on the ground pin (201). The ground reed (202) is in contact with and abuts against the housing assembly, thereby expanding the ground protection form of a connector, and solving the technical problems in the prior art that it is not easy to implement grounding and the grounding is not stable due to the small space of an electrical connector assembly.

Description

A grounding protective flameproof plug technical field

The invention relates to the technical field of electric connectors, in particular to an explosion-proof plug with grounding protection that can work in the environment of combustible gas and dust.

Background technique

With the continuous development of electrical connectors, their functions have been continuously improved. The functions of petroleum and chemical electrical connectors are particularly complex. Not only the connectors and components are required to meet the requirements of airtightness and watertightness, but also the connectors themselves are required to be foolproof. Explosion-proof, electromagnetic shielding, and grounding protection capabilities are all problems that need to be solved in the prior art.

The connector itself will generate a certain amount of static electricity during long-term use. At the same time, when the connector fails, the housing may be charged. In order to prevent the connector housing from being charged, the grounding protection design of the flameproof connector is particularly important. It It can effectively avoid the electric shock problem of the operator, ensure the safe use of the product, and ensure the safety of personnel.

Contents of the invention

The present invention overcomes the deficiencies of the prior art, provides a grounding protection flameproof plug, expands the form of connector grounding protection, and solves the problem that the small space of the electrical connector assembly in the prior art is difficult to achieve grounding and the grounding is not stable. question.

In order to achieve the above object, the technical solution adopted by the present invention is: a grounding protection flameproof plug, including a middle-pass shell assembly, a base assembly is arranged in the shell assembly, and a base assembly is arranged in the base assembly. Several crimping parts; the base part also includes a mounting seat embedded in the outer casing part, and several crimping parts are passed through and fixed on the mounting seat, and the crimping parts include A plurality of docking pins and a grounding pin assembly, the grounding pin assembly includes a grounding pin and a grounding reed arranged on the grounding pin; the grounding reed is in contact with the housing assembly.

In a preferred embodiment of the present invention, the outer shell assembly includes an upper shell and a lower shell that can be combined with each other; one end of the base assembly is inserted into the upper shell, and at least part of the mounting seat is limited. Embedded in the upper shell; the other end of the base fitting penetrates into the lower shell, and at least part of the mounting seat is embedded in the lower shell; and, the mounting seat is embedded One end of the upper shell and the lower shell can be socketed and combined.

In a preferred embodiment of the present invention, the pin or the grounding pin includes a sealing section, and the two ends of the sealing section are respectively provided with elastic contact sections and cable crimping sections that are connected to the cables.

In a preferred embodiment of the present invention, the mounting seat includes an upper base and a lower base sleeved on the press fitting, and a rubber base is arranged between the upper base and the lower base; the press The joint limit is 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 connected with the rubber base; the cable crimping section is connected with the rubber base A lower base is sleeved on one end.

In a preferred embodiment of the present invention, the tops of the elastic contact sections of the docking pins and the grounding pins are provided with multi-lobe grooves, and the multi-lobe grooves divide the elastic contact sections into several shrapnels, and the sectional view of the shrapnel has a fan-shaped structure; And the elastic contact section is in the shape of a trumpet mouth.

In a preferred embodiment of the present invention, the grounding reed includes a mounting end, the outer edge of the mounting end is provided with a grounding plate, and the mounting end and the grounding plate adopt an arc-shaped bending structure.

Specifically, the outer diameter of the top of the elastic contact section is the largest, and the multi-lobed grooves of the docking pins and the grounding pins have a multi-lobed groove structure. For example, three-lobed grooves or four-lobed grooves, but not limited thereto, and the configuration of multi-lobed grooves can be other numbers. More specifically, the top of the elastic contact section is provided with a slope, the slope of the elastic contact section and the straight section of the elastic contact section adopt an R angle transition, the rubber sealing section and the elastic contact section adopt a slope transition, and the slope and the rubber sealing section, elastic The contact section adopts an R angle transition, and the middle part of the rubber sealing section is provided with a sealing groove for combination with the rubber base limit. There is a blind hole processed from the tail of the contact pin inside the cable crimping section of the docking pin and the grounding pin. The rectangular structure runs through one side of the crimping hole wall. The rectangular structure sets a transition zone through the arc section to avoid vertical corners, The sharp corners form a semi-playground structural slot, that is, a crimping slot, and the slotting width of the crimping slot is slightly larger than the width of the crimping plate of the crimping terminal.

Further, the structure of the grounding pin is similar to that of the pin, and the sealing groove of the grounding pin is provided with a semi-circular welding groove as the grounding pin. And the length of the elastic contact section of the grounding pin is longer than that of the mating pin, the maximum outer diameter of the elastic contact section is smaller than the maximum outer diameter of the elastic contact section of the mating pin, and the length of the rubber sealing section of the grounding pin is equal to the length of the mating pin seal. The length of the section plus the thickness of the grounding reed, the tail of the sealing section of the grounding pin is provided with a semi-circular welding groove, and the width of the welding groove is slightly larger than the thickness of the grounding reed.

Specifically, the grounding reed includes a mounting end, the outer edge of the mounting end is provided with a grounding piece, and the mounting end and the grounding piece adopt an arc-shaped bending structure. The maximum diameter of the grounding reed is equal to or slightly larger than the diameter of the grounding ring groove at the tail of the upper case, so as to ensure elastic contact between the grounding reed and the grounding ring groove at the tail of the upper case. The ground reed is a welding end; the welding end is provided with a semicircular notch, and the diameter of the semicircular notch is the same as the diameter of the semi-circular welding groove of the grounding pin. The ground sheet adopts a combination structure of slots. More specifically, the ground sheet adopts a structure of three slots and four sheets. The three slots of the ground sheet are rectangular slots.

The combined structure of the grounding pin and the grounding reed is a grounding pin fitting, and the grounding pin fitting is matched by the semicircular notch of the grounding reed and the semicircular welding groove provided on the sealing groove of the grounding pin. The mounting end of the grounding reed is partially embedded in the semi-circular welding groove of the grounding pin, and the upper end surface of the grounding reed is matched with the lower end surface of the rubber sealing section of the grounding pin, and connected by brazing.

In a preferred embodiment of the present invention, crimping terminals are provided on the docking pins or/and grounding pins of the crimping parts; crimping grooves are provided on the cable crimping section, and the cable crimping section The outer sheath is provided with a crimping terminal, and the crimping terminal includes a sheath, a rivet, and a crimping plate; the sheath is at least partly sleeved in the crimping groove, and the sheath is provided with the The piercing hole corresponding to the crimping groove, the piercing hole is provided with a rivet, and one end of the rivet is pierced to the piercing hole and then connected to the outside of the crimping plate movable embedded in the piercing hole, The inner side of the pressure plate is the pressing side.

Specifically, the tail of the cable crimping section of the docking pin or grounding pin is placed inside the sheath, the crimping plate is placed inside the crimping section of the tail of the pin, and the crimping plate is driven by the rivet to realize the crimping of the crimping plate on the pin. The radial movement of the crimping section at the tail. When crimping the wire, the wire is placed in the crimping hole of the pin, the crimping plate presses the wire, the hexagonal wrench turns the rivet, and the stepped surface of the rivet thread withstands the upper surface of the crimping plate. The rivet thread bears against the sheath, and as the torque increases, the serrated surface of the crimping plate continuously presses the wire, which can effectively ensure the crimping strength of the wire. The crimping terminal cooperates with the internal thread on the sheath through the external thread of the rivet. The crimping plate and the rivet are riveted and connected. The rivet is loaded into the piercing hole of the sheath, and the rivet is screwed out from the internal threaded hole of the piercing hole of the sheath.

In a preferred embodiment of the present invention, the upper casing and the lower casing adopt a tubular structure; the lower end of the upper casing is embedded in the upper end of the upper casing, and The mounting seat is embedded in the connection between the upper shell and the lower shell; the end of the lower shell adjoining the upper shell is sleeved outside the mounting seat; the outer casing assembly also includes The limit sleeve is set on the upper shell and the locking sleeve outside the lower shell; the elastic contact section of the crimping part is embedded in the upper shell, and the cable of the crimping part is crimped The segment is embedded in the lower shell.

In a preferred embodiment of the present invention, one end of the lower case is embedded with the base assembly, and the other end of the lower case is provided with a tail clip, and the tail clip is connected to the lower case A locking tail cover is arranged between them, and a cable connected with the cable crimping section is passed through the tail clip.

In a preferred embodiment of the present invention, a butt joint 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 upper housing The other end is provided with a dustproof cover that can be opened and closed relative to the upper casing and the base assembly; a blind hole that can be set on the upper casing is provided in the dustproof cover, and the dustproof The hole wall of the cover can be plugged and embedded into the butt gap between the upper casing and the locking sleeve; and the outer end of the dust-proof cover is provided with a bolt.

Concretely, the upper casing is a circular tube shell, and the top inner side of the upper part of the upper casing is provided with an inner slope surface, and the upper surface of the casing is provided with a long convex key one, and the long convex key one and the annular boss of the upper casing There is an annular groove 1 between them, which is used to place the sealing outer ring. The inner hole of the upper casing is respectively provided with an inner boss and an annular groove 2, and the tail of the inner hole is provided with two long intervals. The second convex key and the second long convex key are adjacent to the slope ring groove at the tail of the upper casing, and the tail of the outer surface of the upper casing 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°, and the number of effective teeth is ≥7 teeth. The explosion-proof external thread is connected to the annular boss one through the relief groove one. Among them, except for the inner slope surface at the top, the relief groove 1, the explosion-proof external thread, the lower end surface of the annular boss 1, the inner annular groove 2, and the end surface of the tail of the upper casing as the conductive area, the other surfaces Use existing technology to spray or chemically treat the non-conductive area.

Specifically, the lower shell is a circular tube shell, and the top of the inner hole of the lower shell is sequentially provided with a flameproof internal thread, a knife relief groove 2, an annular boss 2, an inner groove 2, a slope surface 2, an inner Torus, Slope One, Slope Two. The outer surface of the lower shell is sequentially provided with step one, step two, and external threads at the tail from the top to the tail. Wherein, the circumference of the second step is processed by knurling and flattening. The inner diameter of the annular boss second is smaller than the inner diameter of the flameproof internal thread. The pitch of the flameproof internal thread is ≥1.25mm, the thread angle is 60°±5°, and the number of effective teeth is ≥7. The second annular boss is used to support the support ring, the support ring pad is placed inside the support ring and the second undercut groove, and the flame-retardant plastic pipe is placed inside the second inner groove. The explosion-proof internal thread, the second undercut, the upper end surface of the second annular boss, and the external thread at the tail are all conductive areas, and the remaining areas are treated with non-conductive surface.

Specifically, the bottom of the blind hole of the dust cover is provided with an annular slope boss along the root of the blind hole, the middle part of the wall of the blind hole is provided with an annular groove three, and an inner groove is provided between the annular groove three and the butt end surface of the dust cover. 3. The angles between the inner groove 3 and the two long convex keys 1 of the upper casing are symmetrical about the axial and radial directions. Among them, the axis is located in the middle of the inner groove 3 of the dust cover, the width and depth of the inner groove 3 of the dust cover are greater than the width and height of the long convex key 1 of the upper shell, and the outside of the dust cover is provided with ACME threads Or rectangular thread, the end face of the dust cover is provided with a bolt for connecting with the cable. The end faces of the bolted piece and the dust cover adopt an arc transition. There is an annular groove four in the middle of the bolt connection, and the top of the bolt connection is designed as a spherical surface; among them, the slope surface of the annular slope boss of the dust cover is a conductive area, and the rest of the surface is sprayed or chemically treated to become a non-conductive area.

A method for preparing a grounding protective flameproof plug, comprising the following steps:

Step 1, the assembly of the base assembly; the grounding pin assembly is composed of a grounding pin and a grounding reed; several butt pins and grounding pin assemblies are respectively equipped with crimping terminals and combined to form a crimping assembly , fixing and combining several press fittings with the mounting base to form a base fitting;

Step 2, assembling the base assembly with the upper shell and the lower shell.

The base assembly is embedded into the upper shell by connecting the cables introduced in the lower shell with the docking pins and grounding pins of the base assembly, and the lower shell and the upper shell are docked and combined;

Step 3, the locking sleeve is sleeved on the upper casing and the lower casing, and the locking sleeve is engaged and fixed outside the junction of the upper casing and the lower casing.

Step 4, when the connector is not working, the dust cover and the locking sleeve are locked, and the explosion-proof surface of the dust cover cooperates with the explosion-proof surface of the upper shell to form a self-resting path of explosion energy; or/and, in When the connector is working, the long convex key on the periphery of the upper shell and the circumference of the end face are the explosion-proof surface, and then cooperate with the explosion-proof surface of the corresponding socket through a fixed gap to form a self-resting path for the explosion energy to ensure the connection between the plug and the docking socket. Internal electric sparks, high-temperature ignition and explosion are not transmitted to the outside through the shell assembly.

The mounting ring grooves on both sides of the sealing groove of the docking pin and the grounding pin assembly cooperate with the upper end surface and the lower end surface of the rubber base respectively to clamp the limit, and the upper base is from the top of the docking pin and the grounding pin assembly. Loading, the lower end surface of the upper base is matched with the upper end surface of the rubber base, the lower base is loaded from the tail of the docking pin and grounding pin assembly, the upper end surface of the lower base is matched with the lower end surface of the rubber base A base fitting is formed; the crimping terminal is fixed with the crimping hole at the tail of the pin to form a crimping fitting.

Put the corrugated retaining ring in the second annular groove inside the upper shell, put the base assembly into the upper shell, the corrugated retaining ring matches with the circumferential step end face of the upper base of the base assembly, and the upper base and the upper The long keyway and the convex key are used to cooperate between the shells to prevent the rotation between the two. The grounding reed of the grounding pin fitting is stuck in the slope ring groove at the tail of the upper shell, and the grounding pin fitting is connected to the upper shell. The electrical connection between the bodies; the upper shell and the lower shell are matched through the set flameproof thread, and the flameproof and electrical structure connection between the upper shell and the lower shell is carried out. At the same time, the end face of the flameproof external thread tail of the upper shell compresses the support ring pad to realize the sealing between the upper shell and the lower shell and the flameproof thread. The top of the upper shell is equipped with a conductive bevel and a conductive bevel inside the dust cover. Angle fit, the upper surface of the inner boss of the locking screw sleeve is matched with the lower surface of the outer boss of the upper shell to realize electrical connection; connect the grounding pin assembly, the upper shell, the lower shell, the dust cover, and the locking sleeve between electrical connectors.

The second undercut groove set in the top of the lower casing is equipped with a support ring and a support ring pad, and the support ring pad is located between the support ring and the second undercut groove of the lower casing. The end face of the ring pad compresses the support pad, and the support ring supports the circumferential boss of the lower base, so as to realize the axial position fixation between the base assembly, the upper shell and the lower shell.

Flame-retardant plastic tubes are installed in two inner grooves of the lower housing, electrically isolating the crimping terminals and the lower housing, and the electrical insulation gap between the crimping terminals and the lower housing is increased in the second inner groove of the lower housing , The tail hole of the lower housing is equipped with a tail rubber sleeve, the outer thread of the tail of the lower housing cooperates with the inner thread of the locking tail cover to lock, and the tail clamp is fixed by a locking screw and a locking nut.

The locking sleeve and the dustproof cover are threadedly matched, 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 casing, and the top end surface of the dustproof cover is in contact with the upper casing. The upper end surface of the external boss is sealed through the sealing outer ring, and the stop screw provided on the locking sleeve is in contact with the lower housing to stop.

The present invention solves the defective that exists in the background technology, the beneficial effect of the present invention:

The invention is a flameproof plug for grounding protection, which expands the form of grounding protection for connectors and solves the technical problems in the prior art that it is difficult to realize grounding in a small space of an electrical connector assembly and the grounding is unstable. Moreover, the parts are all detachable structures, and if some parts fail, they can be disassembled and partly replaced, thereby reducing production costs.

1. The grounding pin assembly realizes the electrical connection between the shell and the grounding pin through the contact reed, and pours the electricity carried by the shell into the grounding pin. The plug shell is a fully enclosed metal shell and has a certain shielding function. The combination of the grounding pin and the contact reed forms an electrical connection closed ring elastically extending to the periphery of the grounding pin, which improves the convenience and stability of electrical contact.

2. Slotted pins and grounding pins are respectively used as elastic contacts, and the traditional contacts are sockets as elastic contacts. The advantage of the present invention is that according to the theory of electrical contact, materials with the same hardness can produce positive pressure The larger it is, the larger the effective contact area between the contact pieces is, and the smaller the contact resistance is, and the present invention can effectively reduce the contact resistance generated when the contact pieces are butted.

3. In the present invention, the outer contact surface of the connector adopts electrical insulation treatment to avoid direct contact between the conductor and the contactor, and the conductive treatment is adopted for the contact connection parts of the parts to ensure that the parts of the connector shell are in contact with each other through threads and end faces. achieved electrical connection.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

Fig. 1 is a schematic diagram of the disassembled structure of a grounding protection flameproof plug of a preferred embodiment of the present invention;

Fig. 2 is a schematic cross-sectional view of a plug structure of a grounding protection flameproof plug in a preferred embodiment of the present invention;

Fig. 3 is a schematic cross-sectional view of a butt joint pin structure of a grounding protection flameproof plug according to a preferred embodiment of the present invention;

Fig. 4 is a schematic axial view of the butt joint pin structure of the ground protection flameproof plug of the preferred embodiment of the present invention;

Fig. 5 is a schematic front view of the grounding pin of the grounding protection flameproof plug of the preferred embodiment of the present invention;

Fig. 6 is a schematic diagram of a grounding reed of a grounding protective flameproof plug in a preferred embodiment of the present invention;

Fig. 7 is a schematic diagram of a grounding pin assembly of a grounding protection flameproof plug in a preferred embodiment of the present invention;

Fig. 8 is a schematic cross-sectional view of a crimping terminal of a grounding protection flameproof plug according to a preferred embodiment of the present invention;

Fig. 9 is a schematic cross-sectional view of the dust cover of the ground protection flameproof plug of the preferred embodiment of the present invention;

Fig. 10 is a schematic axial view of the dust cover of the ground protection flameproof plug of the preferred embodiment of the present invention;

Fig. 11 is a schematic cross-sectional view of the upper shell of the ground protection flameproof plug in a preferred embodiment of the present invention;

Fig. 12 is a schematic axial view of the upper shell of the ground protection flameproof plug of the preferred embodiment of the present invention;

Fig. 13 is a schematic cross-sectional view of the lower housing of the ground protection flameproof plug in a preferred embodiment of the present invention;

Fig. 14 is a schematic axial view of the lower shell of the ground protection flameproof plug of the preferred embodiment of the present invention;

Fig. 15 is a schematic axial view of the lower casing, lower casing, and locking sleeve of the ground protection flameproof plug of the preferred embodiment of the present invention;

In the figure: 1-butting pin; 101-elastic contact section 1; 102-sealing section 1; 103-cable crimping section 1; 2-ground pin assembly; 201-ground pin; 2011-elastic contact section 2; 2012-Sealing section 2; 2013-Welding groove; 2014-Cable crimping section 2, 202-Grounding spring;

3-upper shell; 301-inner slope surface; 302-long convex key one; 303-annular boss one; 304-annular groove one; 305-inner boss; 306-annular groove two; 307-long convex Key 2; 308-tail slope ring groove; 309-flameproof external thread; 310-retreat groove 1;

4-lower shell; 401-flameproof internal thread; 402-relief groove 2; 403-annular boss 2; 404-inner groove 2; 405-slope surface 1; 406-inner ring surface; 407-slope surface Two; 408-step one; 409-step two; 410-tail external thread;

5-upper base; 6-lower base; 7-rubber base; 8-crimping terminal; 801-sheath; 802-rivet; Taiwan; 902-annular groove three; 903-inner groove three; 904-butt thread; 905-bolt joint; 10-lock sleeve;

11-lock tail cover; 12-tail rubber sleeve; 13-tail clamp; 14-corrugated ring; 15-stop screw; 16-lock screw; 17-lock nut; 18-support ring; 19- Support ring pad; 20-seal outer ring; 21-tail gasket; 22-flame-retardant plastic pipe.

detailed description

The present invention will now be further described in detail in conjunction with the accompanying drawings and embodiments. These drawings are all simplified schematic diagrams, only illustrating the basic structure of the present invention in a schematic manner, so it only shows the composition related to the present invention.

It should be noted that if there is a directional indication (such as up-down-bottom-top, etc.) in the embodiment of the present invention, the directional indication is only used to explain the relative positional relationship between the components in a certain posture- Sports conditions, etc., if the specific posture changes, the directional indication will also change accordingly. The terms "first"-"second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first"-"second" may explicitly or implicitly include one or more of these features. Unless otherwise clearly stipulated and limited, the terms "setting"-"connected"-"connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, It can also be indirectly connected through an intermediary, and it can be the internal communication of two elements. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

Embodiment one

As shown in Figures 1 to 15, the grounding protection flameproof plug includes a middle-pass shell assembly, the shell assembly is provided with a base assembly, and the shell assembly includes an upper shell 3 and a lower shell that can be docked and combined with each other. The shell 4; and one end of the upper shell 3 and the lower shell 4 embedded with the mounting seat can be socketed and combined.

Specifically, as shown in Fig. 1, Fig. 2, Fig. 11 and Fig. 12, the upper shell 3 is a circular tube shell, and the top inner side of the upper part of the upper shell 3 is provided with an inner slope surface 301, and the upper surface of the shell is provided with There is a long convex key one 302, and an annular groove one 304 is arranged between the long convex key one 302 and the annular boss one 303 of the upper casing 3, which is used to place the sealing outer ring 20 and the inner part of the upper casing 3. The hole is respectively provided with an inner boss 305 and an annular groove 2 306, and the tail of the inner hole is provided with two intervals of long convex keys 2 307. Adjacent, the tail of the outer surface of the upper casing 3 is provided with a flameproof external thread 309 . The flameproof external thread 309 of the upper shell 3 has a tooth pitch ≥ 1.25mm, a thread angle of 60°±5°, and the number of effective teeth ≥ 7 teeth. The flameproof external thread 309 passes through the relief groove 1 310 and the annular boss 1 303 connected. Wherein, the upper casing 3 except the inner slope surface 301 at the top, the knife relief groove 1 310, the flameproof external thread 309, the lower end surface of the annular boss 1 303, the inner annular groove 2 306, and the rear part of the upper casing 3 The end surface is a conductive area, and the remaining surfaces are sprayed or chemically treated to form a non-conductive area by the prior art.

Specifically, as shown in Figures 1, 2, and 13 to 15, the lower casing 4 is a circular tube shell, and the top of the inner hole of the lower casing 4 is sequentially provided with a flameproof internal thread 401, a knife retraction Groove two 402, annular boss two 403, inner groove two 404, slope two 407, inner ring surface 406, slope one 405, slope two 407. The outer surface of the lower casing 4 is provided with a step 1 408 , a step 2 409 , and an external thread 410 at the tail in sequence from the top to the tail. Wherein, the circumference of the second step 409 is knurled and flattened. The inner diameter of the second annular boss 403 is smaller than the inner diameter of the flameproof internal thread 401 . The pitch of flameproof internal thread 401 is ≥1.25mm, the thread angle is 60°±5°, and the number of effective teeth is ≥7. The second annular boss 403 is used to support the support ring 18, the support ring pad 19 is placed inside the support ring 18 and the undercut 2 402, the flame-retardant plastic pipe 22 is placed inside the inner groove 2 404, and passes through the tail gasket 21 A resilient abutment seal is achieved. The flameproof internal thread 401, the second undercut 402, the upper end surface of the annular boss 2 403, and the tail external thread 410 are all conductive areas, and the rest areas are treated with non-conductive surface.

Specifically, as shown in Fig. 1, Fig. 2, Fig. 9 and Fig. 10, the bottom of the blind hole of the dust cover 9 is provided with an annular slope boss 901 along the root of the blind hole, and the middle part of the wall of the blind hole is provided with an annular groove 3 902, an inner groove 3 903 is provided on the butt end surface of the annular groove 3 902 to the dust cover 9, and the angle between the inner groove 3 903 and the two long convex keys 302 of the upper casing 3 is symmetrical about the axial direction and the radial direction . Wherein, the axis is located in the middle of the inner groove three 903 of the dust cover 9, and 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 convex key one 302 of the upper housing 3, and the dust cover The outside 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 bolt 905 for connecting with a cable. The end surface of the bolting part 905 and the dustproof cover 9 adopts an arc transition. The middle part of the bolted part 905 is provided with an annular groove 4, and the top of the bolted part 905 is designed as a spherical surface; wherein, the slope surface of the annular slope boss 901 of the dust cover 9 is a conductive area, and the remaining surfaces are sprayed or chemically treated to form a non-conductive area. conductive area.

Specifically, as shown in FIG. 1 and FIG. 2 , the base fitting includes a mounting seat embedded in the housing fitting, and several crimping fittings pierced and fixed on the mounting seat. The mounting seat includes an upper base 5 and a lower base 6 that are sleeved on the press fitting, and a rubber base 7 is arranged between the upper base 5 and the lower base 6; Seat 5, rubber base 7, lower base 6. Moreover, one end of the crimping member penetrates into the upper housing 3, and at least part of the mounting seat is limitedly embedded in the upper housing 3; the other end of the crimping member penetrates into the lower housing 4, and at least part of The mounting seat is embedded in the lower casing 4 .

Specifically, as shown in FIGS. 1 to 8 , several crimping joints include several butt joint pins 1 and grounding pin joints 2 . The grounding pin assembly 2 includes a grounding pin 201 and a grounding spring 202 disposed on the grounding pin 201 ; the grounding spring 202 is in contact with the housing assembly. Both the docking pin 1 and the grounding pin 201 include a sealing section, and the two ends of the sealing section are respectively provided with an elastic contact section and a cable crimping section connected with the cable.

Specifically, as shown in Figures 1 to 8, the tops of the elastic contact sections of the docking pin 1 and the grounding pin 201 are provided with multi-lobed grooves, and the multi-lobed grooves divide the elastic contact section into several shrapnels. The sectional view of the shrapnel is The fan-shaped structure; and the elastic contact section is a trumpet structure. The grounding spring 202 includes a mounting end, and a grounding plate is arranged on the outer edge of the mounting end, and the mounting end and the grounding plate adopt an arc-shaped bending structure. More specifically, as shown in FIG. 3 and FIG. 4 , the outer diameter of the top of the elastic contact section is the largest, and the multi-lobed grooves for the docking pin 1 and the grounding pin 201 have a multi-lobed groove structure. The top of the multi-lobe groove is processed by flaring. For example, three-lobed grooves or four-lobed grooves, but not limited thereto, and the configuration of multi-lobed grooves can be other numbers. The top of the elastic contact section is provided with a slope, the slope of the elastic contact section and the straight section of the elastic contact section adopt R angle transition, the rubber sealing section and the elastic contact section adopt a slope transition, and the slope and the rubber sealing section and the elastic contact section adopt R The corner is excessive, and the middle part of the rubber sealing section is provided with an annular groove 4 for limiting combination with the rubber base 7. There is a blind hole processed from the tail of the contact pin inside the cable crimping section of the docking pin 1 and the grounding pin 201. The rectangular structure runs through one side of the crimping hole wall. The rectangular structure sets a transition zone through the arc section to avoid vertical The corners and sharp corners form a semi-playground structural groove, that is, a crimping groove. The width of the crimping groove is slightly larger than the width of the crimping plate 803 of the crimping terminal 8 . The maximum outer diameter of the elastic contact section is larger than the aperture of the corresponding docking socket. In order to achieve the bell mouth of the elastic contact section at a certain angle, the maximum outer diameter of the elastic contact section is larger than the aperture of the corresponding docking socket, which is not limited to the processing of the top opening of the pin , It can also be formed by machine-plus-integrated processing.

Specifically, as shown in FIG. 1 , FIG. 2 , and FIG. 4 to FIG. 7 , the ground pin 201 of the ground pin assembly 2 is similar in structure to the pin. A semi-circular welding groove 2013 is provided on the sealing section of the ground pin 201 . And the length of the elastic contact section of the grounding pin 201 is longer than the length of the elastic section of the docking pin 1, the maximum outer diameter of the elastic contact section is smaller than the maximum outer diameter of the elastic contact section of the docking pin 1, and the length of the rubber sealing section of the grounding pin 201 is equal to The length of the sealing section of the docking pin 1 plus the thickness of the grounding reed 202 , the tail of the sealing section of the grounding pin 201 is provided with a semi-circular welding groove 2013 , and the width of the welding groove 2013 is slightly larger than the thickness of the grounding reed 202 . More specifically, as shown in FIG. 5 , the grounding spring 202 of the grounding pin assembly 2 includes a mounting end, and a grounding plate is provided on the outer edge of the mounting end, and the mounting end and the grounding plate adopt an arc-shaped bending structure. The maximum diameter of the grounding reed 202 is equal to or slightly larger than the diameter of the grounding ring groove at the tail of the upper casing 3 to ensure elastic contact between the grounding spring 202 and the grounding ring groove at the tail of the upper casing 3 . The grounding reed 202 is a welding end; the welding end is provided with a semicircular notch, and the diameter of the semicircular notch is the same as that of the semicircular welding groove 2013 on the grounding pin 201 . The ground sheet adopts a combination structure of slots. The ground sheet adopts a three-slot four-piece structure. The three slots of the ground sheet are rectangular slots. Further, as shown in FIG. 6 , the grounding pin assembly 2 is matched by the semicircular gap of the grounding reed 202 and the semi-circular welding groove 2013 provided on the sealing section of the grounding pin 201, and the sealing section is a concave groove of an annular structure. groove. The mounting end of the grounding spring 202 is partially embedded in the semi-circular welding groove 2013 of the grounding pin 201, and the upper end of the grounding spring 202 matches the lower end of the rubber sealing section of the grounding pin 201, and is connected by brazing.

Here, in order to distinguish between the drawings in the specification, the sealing section, the elastic contact section, and the cable crimping section of the connecting pin 1 and the grounding pin 201 will be distinguished and expressed. The docking pin 1 includes a first sealing section 102 , and elastic contact section one 101 and a cable crimping section one 103 connected to the cable are respectively provided at both ends of the first sealing section 102 . The grounding pins 201 each include a second sealing section 2012 , and the two ends of the second sealing section 2012 are respectively provided with a second elastic contact section 2011 and a second cable crimping section 2014 connected to the cable. Further, the rubber base 7 is sleeved on the first sealing section 102 and the second sealing section 2012, and the upper base 5 is sleeved on the ends of the first elastic contact section 101 and the second elastic contact section 2011 respectively connected to the rubber base 7; The end of the first cable crimping section 103 and the second cable crimping section 2014 is connected to the rubber base 7 with a lower base 6 sheathed on it.

Furthermore, crimping terminals 8 are provided on the mating pins 1 and/or grounding pins 201 of the crimping parts; crimping grooves are provided on the cable crimping section, and crimping grooves are provided on the outside of the cable crimping section. The wire terminal 8, and the crimping terminal 8 includes a sheath 801, a rivet 802, and a crimping plate 803; the sheath 801 is at least partly sleeved outside the crimping groove, and the sheath 801 is provided with a perforation hole corresponding to the crimping groove A rivet 802 is arranged in the piercing hole, and one end of the rivet 802 is pierced to the piercing hole and then connected with the outside of the crimping plate 803 movably embedded in the piercing hole, and the inner side of the crimping plate 803 is the pressing side. During installation, the tail of the cable crimping section of the docking pin 1 or the grounding pin 201 is placed inside the sheath 801, and the crimping plate 803 is placed inside the crimping section of the tail of the pin, and the crimping plate 803 is driven by the rivet 802 to realize The crimping plate 803 moves in the radial direction of the crimping section at the tail of the pin. When crimping the wire, the wire is placed in the crimping hole of the pin, the crimping plate 803 presses the wire, and the hexagonal wrench turns the rivet 802. The thread of the rivet 802 The stepped surface bears against the upper surface of the crimping plate 803, and the thread of the rivet 802 bears against the sheath 801. As the torque increases, the serrated surface of the crimping plate 803 continuously compresses the wire, which can effectively ensure the crimping strength of the wire. The crimping terminal 8 cooperates with the internal thread on the sheath 801 through the external thread of the rivet 802, and the crimping plate 803 is connected with the rivet 802 by riveting. After the riveting, the crimping plate 803 and the rivet 802 can rotate freely. After the rivet 802 is riveted, it is loaded into the piercing hole of the sheath 801 , and the rivet 802 is screwed out from the internal threaded hole of the piercing hole of the sheath 801 .

As shown in Figure 8, the crimping terminal 8 is matched by the external thread of the rivet 802 and the internal thread on the sheath 801, the crimping plate 803 and the rivet 802 are riveted and connected. Rotate, after crimping plate 803 and rivet 802 are turned over and riveted, they are loaded through the through hole of sheath 801, and rivet 802 is screwed out from the inner threaded hole of sheath 801; 8, the crimping section at the tail of the pin is placed inside the sheath 801, the crimping plate 803 is placed inside the crimping section at the tail of the pin, and the crimping plate 803 is driven by the rivet 802 to realize the diameter of the crimping plate 803 on the crimping section at the tail of the pin. When crimping the wire, the cable is placed in the perforation hole of the sheath 801, that is, in the crimping groove of the cable crimping section, the crimping plate 803 presses the wire, and the hex wrench turns the rivet 802, the rivet The 802 thread stepped surface bears against the upper end surface of the crimping plate 803, and the rivet 802 thread bears against the sheath 801. As the torque increases, the serrated surface of the crimping plate 803 continuously compresses the wire, which can effectively ensure the crimping strength of the wire .

The upper shell 3 and the lower shell 4 adopt a tubular structure; the lower end of the upper shell 3 is embedded in the upper end of the upper shell 3, and the mounting seat is embedded in the upper shell 3 and the lower shell. 4; the butt end of the lower shell 4 and the upper shell 3 is sleeved outside the mounting seat; the shell assembly also includes a locking sleeve 10 that is set on the outside of the upper shell 3 and the lower shell 4. The elastic contact section of the crimping part in the base fitting is embedded in the upper casing 3 , and the cable crimping section of the crimping part in the base fitting is embedded in the lower casing 4 . One end of the lower housing 4 is embedded with a base assembly, the other end of the lower housing 4 is provided with a tail wire clamp 13, and a locking tail cover 11 is arranged between the tail wire clamp 13 and the lower housing 4, and the tail wire A cable that is connected to the cable crimping section passes through the clip 13 . There is also a docking gap reserved between the upper housing 3 and the locking sleeve 10; one end of the upper housing 3 is embedded with a base fitting, and the other end of the upper housing 3 is provided with a A dust cover 9 that can be opened and closed; the dust cover 9 is provided with a blind hole that can be set on the upper casing 3, and the hole wall of the dust cover 9 can be inserted into the upper casing 3 and the lock. In the butt joint gap between the tight sleeves 10; and the outer end of the dust cover 9 is provided with a bolt 905.

Embodiment two

A method for preparing and assembling a grounding protective flameproof plug, comprising the following steps:

Step one, the assembly of the base assembly.

The grounding pin assembly 2 is formed by welding the grounding pin 201 and the grounding reed 202; several butt joint pins 1 and the grounding pin assembly 2 are respectively equipped with crimping terminals 8 to form a crimping joint. The joint part is fixedly combined with the mounting seat to form a base joint part.

Further, specifically, the mounting ring grooves on both sides of the ring groove 4 of the docking pin 1 and the grounding pin assembly 2 cooperate with the upper end surface and the lower end surface of the rubber base 7 respectively to clamp and limit, and the upper base 5. Load it from the top of the docking pin 1 and the grounding pin assembly 2. The lower end surface of the upper base 5 is matched with the upper end surface of the rubber base 7. The lower base 6 is connected from the docking pin 1 and the grounding pin assembly 2. The tail of the lower base 6 is matched with the lower end surface of the rubber base 7 to form a base assembly; the assembly of the crimp joint is composed of a sheath 801, a crimping plate 803, and a rivet 802 through the crimping terminal 8. Composition, the crimping terminal 8 is fixed to the crimping hole at the tail of the pin by means of 9 points to form a crimping joint.

Step 2, assembling the base assembly with the upper shell 3 and the lower shell 4 .

Embed the base fitting into the upper case 3 by connecting the cable introduced in the lower case 4 with the docking pin 1 and the grounding pin fitting 2 of the base fitting, and connecting the lower case 4 with the upper The shells 3 are butted together.

Further, place the bellows retaining ring 14 in the inner annular groove 2 306 of the upper housing 3, the base assembly is loaded into the upper housing 3, and the ring of the upper base 5 of the bellows retaining ring 14 and the base assembly The end faces of the surrounding steps are matched, and the upper base 5 and the upper housing 3 are prevented from rotating through the cooperation of the long keyway and the long convex key. The grounding reed 202 of the grounding pin assembly 2 is stuck on the upper housing 3 In the slope ring groove 308 at the end of the tail, the electrical connection between the grounding pin assembly 2 and the upper case 3 is connected; Flameproof and electrical structural connections are made between the lower housings 4 . At the same time, the flameproof external thread 309 tail end face of the upper casing 3 compresses the support ring pad 19 to realize the sealing and thread flameproof between the upper casing 3 and the lower casing 4, and the top of the upper casing 3 is provided with a conductive bevel and an anti-corrosion The conductive oblique angle fits inside the dust cover 9, and the upper surface of the inner boss of the locking sleeve 10 cooperates with the lower surface of the outer boss of the upper casing 3 to realize electrical connection; An electrical connector between the casing 4, the dust cover 9 and the locking sleeve 10.

Specifically, the support ring 18 and the support ring pad 19 are equipped with the support ring 18 and the support ring pad 19 at the undercut groove 2 402 provided in the top of the lower casing 4, and the support ring pad 19 is located at the support ring 18 and the undercut groove 2 402 of the lower casing 4 Between, the tail end face of the upper shell 3 and the end face of the support ring pad 19 compress the support pad, and the support ring 18 supports the circumferential boss of the lower base 6 to realize the connection between the base assembly, the upper shell 3, and the lower shell 4. The axial position is fixed.

Specifically, the flame-retardant plastic tube 22 is put into the inner groove 2 404 of the lower case 4 to electrically isolate the crimping terminal 8 from the lower case 4, and the design of the inner groove 404 of the lower case 4 increases the crimping. The electrical insulation gap between the terminal 8 and the lower casing 4, the tail hole of the lower casing 4 is equipped with a tail rubber sleeve 12, and the tail external thread 410 of the lower casing 4 is locked with the internal thread of the locking tail cover 11, The tail clamp 13 is fixed by a locking screw 16 and a locking nut 17 .

Step 3, the locking sleeve 10 is sleeved on the upper casing 3 and the lower casing 4, and the locking sleeve 10 is engaged and fixed outside the connection between the upper casing 3 and the lower casing 4;

The locking sleeve 10 and the dustproof cover 9 are threadedly matched, and the upper step surface of the inner hole boss of the locking sleeve 10 is in contact with the lower step surface of the outer boss of the upper housing 3, and the top end surface of the dustproof cover 9 is in contact with The upper end surface of the outer boss mounted on the upper casing 3 is sealed through the sealing outer ring 20, and the stop screw 15 provided on the locking sleeve 10 contacts and stops with the lower casing 4;

Step 4, when the connector is not working, the dust cover 9 and the locking sleeve 10 are locked, and the explosion-proof surface of the dust cover 9 cooperates with the explosion-proof surface of the upper casing 3 to form a self-absorbing passage of explosion energy; or /And, when the connector is working, the long convex key on the periphery of the upper shell 3 is an explosion-proof surface to the circumference of the end face, and then cooperates with the explosion-proof surface of the corresponding socket through a fixed gap to form a self-resting path for explosion energy, ensuring The internal sparks and high-temperature ignition and explosion of the plug and the docking socket are not transmitted to the outside through the shell joint.

working principle:

As shown in Figures 1 to 15, all parts of the present invention are detachable structures, and if a part fails, it can be disassembled and replaced to reduce production costs. At the same time, the invention adopts electrical insulation treatment for the outer contact surface of the connector to avoid direct contact between the conductor and the contactor, and the conductive treatment adopted for the contact connection part of the parts ensures that the parts of the connector shell are in contact with each other through threads and end surfaces. achieved electrical connection. The slotted docking pin 1 and the grounding pin 201 are respectively used as elastic contacts, and the traditional contact is a socket as the elastic contact. According to the electric contact theory, the material with the same hardness, the greater the positive pressure generated by the contact pieces, the larger the effective contact area between the contact pieces, and the smaller the contact resistance. resulting contact resistance. The grounding pin assembly 2 realizes the electrical connection between the housing and the grounding pin 201 through the grounding reed 202 , and pours the electricity carried by the housing into the grounding pin 201 . The upper shell and the lower shell of the shell assembly of the plug are fully enclosed metal shells, and have a certain shielding function at the same time. The combination of the grounding pin 201 and the grounding reed 202 forms an electrical connection closed loop elastically extending to the periphery of the grounding pin 201 , which improves the convenience and stability of electrical contact.

The flameproof plug of the present invention is mainly used in explosive gas environment and explosive dust environment. Between the dustproof cover 9 and the upper casing 3, the sealing outer ring 20 is used for sealing. When not in use, the dust cover 9 is not removed, and the lock sleeve 10 and the dust cover 9 are locked by knurling, and there are two stop screws on the lock sleeve 10, the stop screws are connected with the lower housing Contact stop. When in use, take off the dustproof cover 9 and connect the flameproof plug with the corresponding socket.

The long convex key 302 on the periphery of the upper shell 3 to the end face is called the explosion-proof surface, and then cooperates with the explosion-proof surface of the corresponding socket through a fixed gap to form a path for the self-rest of the explosion energy to ensure the internal spark of the plug and the docking socket 1. The high-temperature ignition explosion is not transmitted to the outside through the shell assembly; in addition, a section of the circumferential surface from the inner circumferential groove of the dust cover 9 to the bottom of the dust cover 9 is an explosion-proof surface. When the connector is not working, the anti- The dust cover 9 is locked with the locking sleeve 10, and the explosion-proof surface of the dust cover 9 cooperates with the explosion-proof surface of the upper casing 3 to form a self-resting path of explosion energy, and then cooperates with the sealed outer ring 20 outside the upper casing 3 to ensure The energy of the explosion is not transmitted to the outside of the shell assembly, causing an external explosion, thereby playing the role of flameproof. The grounding pin 201 and the grounding reed 202 are connected to the upper housing 3, and the upper housing 3 is electrically connected to the locking sleeve 10 and the lower housing 4 through threads and end faces, respectively, so as to conduct static electricity on the housing of the housing assembly. Walk. The plug in the present invention is a three-phase alternating current plus grounding protection, and the aluminum alloy material used as the structural material also plays the role of 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 conduct static electricity away from the shell to protect the safety of operators.

The above is inspired by the ideal embodiment of the present invention. Through the above description, relevant personnel can make various changes and modifications within the scope of not departing from the technical idea of the present invention. The technical scope of the present invention is not limited to the content in the specification, and must be determined according to the scope of the claims.

Claims (10)

1. The grounding protection flameproof plug includes a middle-pass shell assembly, a base assembly is arranged in the shell assembly, and several crimping joints are arranged in the base assembly; it is characterized in that: the base assembly The seat joint also includes a mounting seat embedded in the housing joint, and several crimping joints are pierced and fixed on the mounting seat, and the crimping joints include several docking pins and grounding pins An assembly, the grounding pin assembly includes a grounding pin and a grounding reed disposed on the grounding pin; the grounding reed is in contact with the housing assembly.
2. The ground protection flameproof plug according to claim 1, characterized in that: the shell assembly includes an upper shell and a lower shell that can be combined with each other;

   One end of the base fitting is penetrated into the upper casing, and at least part of the mounting seat is limitedly embedded in the upper casing; the other end of the base fitting is pierced into the lower casing , and at least part of the mounting seat is embedded in the lower casing; and, one end of the upper casing and the lower casing embedded with the mounting seat can be socketed and combined.
3. The ground protection flameproof plug according to claim 1, characterized in that: the contact pin or the ground contact pin both include a sealing section, and the two ends of the sealing section are respectively provided with elastic contact sections, and are connected to the cable The butt-connected cable crimping section; the top of the elastic contact section of the docking pin and the grounding pin is provided with a multi-petal groove, and the multi-petal groove separates the elastic contact section into several shrapnel, and the cross-sectional view of the shrapnel is a fan-shaped structure; and The elastic contact section has a trumpet structure.
4. The ground protection flameproof plug according to claim 1, characterized in that: the mounting seat includes an upper base and a lower base sleeved on the crimping joint, and the upper base and the lower base are A rubber base is provided between them; the pressure joint part 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 connected with the rubber base; the cable crimping section is connected with the rubber base A lower base is sleeved on one end.
5. The flameproof plug for grounding protection according to claim 4, wherein the grounding reed includes a mounting end, the outer edge of the mounting end is provided with a grounding plate, and the mounting end and the grounding plate adopt an arc-shaped fold curved structure.
6. The ground protection flameproof plug according to claim 5, characterized in that: crimping terminals are provided on the butt pins or/and grounding pins of the crimping parts; crimping terminals are provided on the cable crimping section. Groove, the outside of the cable crimping section is sleeved with crimping terminals, and the crimping terminals include sheaths, rivets, and crimping plates; the sheath is at least partly sleeved in the crimping groove, and the The sheath is provided with a piercing hole corresponding to the crimping groove, and a rivet is provided in the piercing hole, and one end of the rivet is pierced to the piercing hole and is movable embedded in the piercing hole. The outer side of the inner pressure plate is connected, and the inner side of the pressure plate is the pressure side.
7. The ground protection flameproof plug according to claim 6, characterized in that:

   The upper casing and the lower casing adopt a tubular structure of a middle pass;

   The lower end of the upper case is embedded in the upper end of the upper case, and the mounting seat is embedded in the connection between the upper case and the lower case;

   One end of the lower shell docked with the upper shell is sleeved outside the mounting seat;

   The outer casing assembly also includes a locking sleeve that is set outside the upper casing and the lower casing; the elastic contact section of the press fitting of the base assembly is embedded in the upper casing In the body, the cable crimping section of the crimping part of the base fitting is embedded in the lower shell;

   One end of the lower case is embedded with the base assembly, the other end of the lower case is provided with a tail clip, and a locking tail cover is provided between the tail clip and the lower case, A cable that is connected to the cable crimping section passes through the tail clip.
8. The ground protection flameproof plug according to claim 7, characterized in that: a butt joint gap is reserved between the upper shell and the locking sleeve; one end of the upper shell is embedded with the The base assembly, the other end of the upper casing is provided with a dust cover that can be opened and closed relative to the upper casing and the base assembly; The blind hole on the body, and the hole wall of the dust-proof cover can be plugged and embedded into the butt joint gap between the upper housing and the locking sleeve; and the outer end of the dust-proof cover is provided with Bolts.
9. The preparation method of the grounding protection flameproof plug is characterized in that: the preparation method of the grounding protection flameproof plug described in any one of claims 1 to 8 comprises the following steps:

   Step 1, the assembly of the base assembly;

   The grounding pin assembly is composed of grounding pins and grounding reeds welded; several butt joint pins and grounding pin assemblies are respectively equipped with crimping terminals to form crimping joints, and several crimping joints are connected to the mounting base. The fixed combination forms the base assembly;

   Step 2, the assembly of the base assembly, the upper shell, the lower shell and the locking sleeve;

   The base assembly is embedded into the upper shell by connecting the cables introduced in the lower shell with the docking pins and grounding pins of the base assembly, and the lower shell and the upper shell are docked and combined;

   Step 3, the locking sleeve is sleeved on the upper casing and the lower casing, and the locking sleeve is engaged and fixed on the outside of the connection between the upper casing and the lower casing;

   Step 4, when the connector is not working, the dust cover and the locking sleeve are locked, and the explosion-proof surface of the dust cover cooperates with the explosion-proof surface of the upper shell to form a self-resting path of explosion energy; or/and, in When the connector is working, the long convex key on the periphery of the upper shell and the circumference of the end face are the explosion-proof surface, and then cooperate with the explosion-proof surface of the corresponding socket through a fixed gap to form a self-resting path for the explosion energy to ensure the connection between the plug and the docking socket. Internal electric sparks, high-temperature ignition and explosion are not transmitted to the outside through the shell assembly.
10. The preparation method of the ground protection flameproof plug according to claim 9, characterized in that:

    The mounting ring grooves on both sides of the sealing groove of the docking pin and the grounding pin assembly cooperate with the upper end surface and the lower end surface of the rubber base respectively to clamp the limit, and the upper base is from the top of the docking pin and the grounding pin assembly. Loading, the lower end surface of the upper base is matched with the upper end surface of the rubber base, the lower base is loaded from the tail of the docking pin and grounding pin assembly, the upper end surface of the lower base is matched with the lower end surface of the rubber base The base joint is formed; the crimping terminal is fixed with the crimping hole at the tail of the pin to form a crimping joint;

    Or/and, place the corrugated retaining ring in the inner annular groove 2 of the upper shell, put the base assembly into the upper shell, and fit the corrugated retaining ring with the circumferential step end surface of the upper base of the base The base and the upper shell are matched by long key slots and convex keys to prevent the rotation between the two, and the grounding reed of the grounding pin assembly is stuck in the slope ring groove at the tail of the upper shell, and the grounding pin is closed. The electrical connection between the parts and the upper casing; the upper casing and the lower casing are matched through the set flameproof thread, and the flameproof and electrical structure connection between the upper casing and the lower casing is carried out;

    The flameproof external thread tail end of the upper shell compresses the support ring pad to realize the sealing between the upper shell and the lower shell and the flameproof thread. The top of the upper shell is equipped with a conductive bevel and a conductive bevel inside the dust cover Cooperate, the upper surface of the internal boss of the locking nut is matched with the lower surface of the outer boss of the upper shell to realize electrical connection; connect the grounding pin assembly, the upper shell, the lower shell, the dust cover, and the locking sleeve electrical connectors;

    Or/and, the top of the lower housing is provided with a support ring and a support ring pad at the second undercut groove, and the support ring pad is located between the support ring and the second undercut groove of the lower housing. The end face of the tail end and the end face of the support ring pad compress the support pad, and the support ring supports the circumferential boss of the lower base to realize the axial position fixation between the base assembly, the upper shell and the lower shell;

    Or/and, the flame-retardant plastic tube is installed in the second inner groove of the lower case, electrically isolating the crimping terminal and the lower case, and the second inner groove of the lower case adds a gap between the crimping terminal and the lower case The electrical insulation gap, the tail hole of the lower housing is equipped with a tail rubber sleeve, the outer thread of the tail of the lower housing is locked with the inner thread of the locking tail cover, and the tail clamp is fixed by a locking screw and a locking nut;

    Or/and, the locking sleeve and the dust cover are threadedly matched, 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 housing, and the top end surface of the dust cover is in contact with the mounting surface. The upper end surface of the outer boss of the upper casing is sealed through the sealing outer ring, and the stop screw provided on the locking sleeve contacts and stops with the lower casing.

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