CN215568800U

CN215568800U - Mistake proofing double-locking quick connector

Info

Publication number: CN215568800U
Application number: CN202121520851.0U
Authority: CN
Inventors: 徐�明; 曹树林; 申太明; 李旭阳; 万雄伟; 韩宗俊; 徐梓净; 杨毅
Original assignee: Chongqing Sulian Plastic Co ltd
Current assignee: Chongqing Sulian Plastic Co ltd
Priority date: 2021-07-05
Filing date: 2021-07-05
Publication date: 2022-01-18
Anticipated expiration: 2031-07-05

Abstract

The utility model discloses a mistake-proofing double-locking quick connector which comprises a male plug with a boss and a shell (1), wherein a cavity structure is arranged in the shell (1), a first jack (11), a second jack (12), a first limiting hole (13) and a second limiting hole (14) are arranged on the cavity structure, and a positioning block (15) is also arranged in the cavity structure; a locking device is inserted into the first jack (11), and a positioning card is inserted into the second jack (12). The shell is fixedly connected with the locking device and the positioning card, so that the male plug is protected doubly, the installation state can be observed conveniently, the situation of installation falling is avoided, the structure is simple, and the assembly and disassembly are convenient.

Description

Mistake proofing double-locking quick connector

Technical Field

The utility model relates to the field of automobile manufacturing, in particular to a mistake-proofing double-locking quick connector.

Background

At present, a single locking mechanism is mainly adopted in a quick connecting device widely applied to automobile fuel and new energy pipeline systems. Generally, the risk that a pipeline system leaks due to the fact that a single locking mechanism connecting device is unlocked under the action of external force (vibration, flying stones and the like) in the working process is high, the problem can be well solved by improving the single locking mechanism into a double locking mechanism, and under the condition that any one locking mechanism is unlocked and fails, the other locking mechanism can still lock a male joint assembled and connected with the locking mechanism in the connecting device. Although a plurality of types of double-locking-mechanism connecting devices are applied to an automobile pipeline system at present, the situation that locking is unstable still exists, particularly after a locking mechanism is easy to fall off from the connecting device or lose efficacy in an unlocking process, the male joint has large axial movement displacement, and the defects that whether the male joint is installed in place cannot be verified exist.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem of providing a mistake-proof double-locking quick connector which is convenient to disassemble and assemble and is convenient to check the installation state of a male plug.

The technical scheme of the utility model is as follows:

a mistake-proofing double-locking quick connector comprises a male plug with a boss and a shell, wherein a cavity structure is arranged in the shell, one end of the cavity structure is provided with a first jack, the other end of the cavity structure is provided with a second jack, the middle part of the shell corresponding to the cavity structure is symmetrically provided with a first limiting hole and a second limiting hole in a communicating mode, the upper parts of the hole walls of the same ends of the two limiting holes are provided with first inclined surface walls, and a positioning block is further arranged in the cavity structure; a locking device is inserted into the first jack and comprises a push plate, a limiting block is arranged at the upper end of the push plate, a first clamping strip and a second clamping strip are arranged at the lower end of the push plate, a second inclined section is respectively arranged on each of the two clamping strips, and the corresponding positions of the two clamping strips are pre-clamped with the corresponding positions on the positioning block; a positioning card is inserted into the second jack and comprises a first positioning rod and a second positioning rod, and a first inclined section is arranged on each of the two positioning rods; after the male plug is inserted, the boss moves from top to bottom and sequentially extrudes the first oblique section and the second oblique section, so that the two clamping strips and the two positioning rods are sequentially opened, after the boss moves downwards to the right position, the two positioning rods of the positioning clamp retract and the corresponding positions are attached to the outer side wall of the male plug, the corresponding positions on the two clamping strips slide along the outer side curved surface of the male plug, the two clamping strips move to the corresponding positions of the positioning blocks for positioning and clamping, and meanwhile, the boss is abutted to the corresponding positions of the limiting blocks for limiting; when the male plug is dismounted, the two clamping strips are firstly pulled open, the locking device is pulled out, then the two positioning rods are pulled open, and the male plug can be pulled out by giving way to the lug boss.

By adopting the structure, the locking device is inserted into the shell from the first jack position, the clamping strip is pre-clamped with the corresponding position of the positioning block, at the moment, the positioning card is inserted from the second jack position, the first inclined sections of the two positioning rods on the positioning card and the limiting block surround to form a hole-shaped structure for inserting the male plug, and meanwhile, the two second inclined sections on the locking device surround to form a ring-hole-shaped structure; after the male plug is inserted, the boss moves from top to bottom and sequentially extrudes the first oblique section and the second oblique section, so that the two clamping strips and the two positioning rods are sequentially opened, after the boss moves downwards to the right position, the two positioning rods of the positioning clamp retract and the corresponding positions are attached to the outer side wall of the male plug, the corresponding positions on the two clamping strips slide along the outer side curved surface of the male plug, the two clamping strips move to the corresponding positions of the positioning blocks for positioning and clamping, and meanwhile, the boss is abutted to the corresponding positions of the limiting blocks for limiting; if the male plug is not installed in place, one condition is that the positioning clamp is loosened when the two positioning rods are in an opening state compared with initial positions in the two limiting holes, and the other condition is that the boss of the male plug steps over the positioning rods, but the clamping strip and the positioning block are not moved to the clamping and positioning position from pre-clamping, the two clamping strips of the locking device can be seen to be outwards opened from the outside of the shell, namely the locking device is loosened, and the positions of the two limiting holes are convenient for checking the installation state; when the male plug is dismounted, the two clamping strips are firstly pulled out from the positioning block and the locking device is pulled out, meanwhile, the clamping strips are moved to the position pre-clamped with the positioning block, the locking device can be prevented from sliding off, then the two positioning rods are pulled out, the male plug can be pulled out by giving the boss out of position, the structure is simple and compact, and the whole dismounting process is simple, convenient and quick.

In order to simplify the structure and facilitate production, preferably, the positioning block is symmetrically provided with two first clamping blocks and two second clamping blocks, corresponding positions of the first clamping block, the second clamping block and the positioning block at corresponding ends surround to form a clamping groove, and corresponding positions of the second clamping block and the positioning block surround to form an opening groove.

In order to better limit the male plug, adapt to the appearance of the positioning card and avoid using interference, as an optimization, one side of the limiting block is provided with an arc groove matched with the outer diameter of the male plug, the left side and the right side of the notch of the arc groove are respectively provided with a yielding groove, the outer side of each yielding groove is provided with a horizontally extending convex block, and each convex block is provided with a yielding inclined section; the lower end of the limiting block is provided with a fixed block, the fixed block and the limiting block form a step structure with a wide upper part and a narrow lower part, the fixed block is provided with a limiting groove concentric with the arc groove, and the lower end surface of the fixed block is provided with a lightening hole.

In order to facilitate the adaptation with the corresponding structure of the shell and simplify the structure, preferably, a first clamping strip and a second clamping strip which horizontally extend out are arranged on the limiting block, and extension lines of the extending ends of the two clamping strips are intersected on the horizontal plane; a first contact block and a first positioning block are sequentially arranged on the inner side wall of the first clamping strip along the extending direction, a first anti-falling block is arranged on the outer side wall of the first clamping strip, a first groove is formed in the inner side wall of the first contact block, and a second inclined section is arranged at the upper end of the first contact block; second feeler block and second locating piece are equipped with in proper order along the direction of stretching out on the inside wall of second card strip, are equipped with second anticreep piece on the lateral wall of this second card strip, the inside wall of second feeler block is equipped with the second recess, and the upper end of this second feeler block also is equipped with one section second oblique section, and the locking ware stretches into first jack, and when first card strip and second card strip removed the position department of locating piece, first locating piece and second locating piece all insert the joint in advance in the draw-in groove of corresponding end. .

In order to facilitate production and guarantee the consistency of the dismounting state, the first contact block and the second contact block, the first groove and the second groove, the two second inclined sections and the first anti-falling block and the second anti-falling block are symmetrically arranged.

In order to simplify the structure and facilitate production, the positioning clamp preferably comprises an arc-shaped plate, the positioning clamp comprises the arc-shaped plate, a first positioning rod and a second positioning rod which horizontally extend out are arranged at the upper end of the arc-shaped plate, and extension lines of extension ends of the two positioning rods are intersected on a horizontal plane; the first positioning rod is provided with a first positioning boss, one side of the extending end of the first positioning rod is provided with a first inclined section, the other side of the extending end of the first positioning rod is provided with a first extending section which extends into the first limiting hole in an inclined mode, the first extending section is attached to a first inclined wall in the first limiting hole, and one side of the first inclined section is provided with a first inserting block; the second positioning rod is provided with a second positioning boss, one side of the extending end of the second positioning rod is also provided with a first inclined section, the other side of the extending end of the second positioning rod is provided with a second extending section which extends into the second limiting hole in an inclined mode, the second extending section is attached to a first inclined wall in the second limiting hole, and one side of the first inclined section is provided with a second inserting block.

In order to facilitate production and ensure consistency of the disassembly and assembly states, preferably, the first positioning boss and the second positioning boss are symmetrically arranged, the two first inclined sections are symmetrically arranged, the first extending section and the second extending section are symmetrically arranged, and the first inserting block and the second inserting block are symmetrically arranged.

In order to avoid the assembling and disassembling slippage, a tooth groove is preferably arranged on the outer side surface of the push plate.

In order to facilitate disassembly, preferably, a notch is formed in one side, corresponding to the first insertion hole, of the cavity bottom of the cavity structure, a first disassembly groove (41) is formed between the notch and the push plate in a surrounding mode, and the first disassembly groove is communicated with the lightening hole in the locking device; a second dismounting groove is formed between one side of the cavity bottom of the cavity structure corresponding to the second jack and the arc-shaped plate in a surrounding mode.

In order to enable the two positioning rods of the positioning clamp to be rapidly opened during disassembly, preferably, guide grooves are formed in the positions, corresponding to the first positioning bosses and the second positioning bosses, of the cavity top of the cavity structure, the first positioning bosses and the second positioning bosses are respectively clamped in the guide grooves of the corresponding ends, the groove walls, corresponding to one side of the first insertion hole, of the guide grooves are second inclined wall walls, and the slopes of the second inclined walls are the same as those of the first inclined walls.

Has the advantages that: the shell is fixedly connected with the locking device and the positioning card, so that the male plug is protected doubly, the installation state can be observed conveniently, the situation of installation falling is avoided, the structure is simple, and the assembly and disassembly are convenient.

Drawings

Fig. 1 is an exploded view of the installation of the present invention.

Fig. 2 is a schematic structural view of the cavity structure top of the housing.

Fig. 3 is a schematic structural view of a cavity structure.

Fig. 4 is a schematic structural view of the locker.

Fig. 5 is a top view of fig. 4.

Fig. 6 is a bottom view of fig. 4.

Fig. 7 is a schematic structural diagram of the locator card.

Fig. 8 is a top view of fig. 7.

Fig. 9 is a schematic view of the installation process of the present invention.

Fig. 10 is a schematic view of the mounting structure of the present invention.

Fig. 11 is a bottom view of fig. 10.

Detailed Description

The utility model will be further explained with reference to the drawings.

As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5, fig. 6, fig. 7, fig. 8, fig. 9, fig. 10 and fig. 11, the present invention includes a male plug with a boss and a housing 1, a cavity structure is provided in the housing 1, one end of the cavity structure is provided with a first jack 11, the other end is provided with a second jack 12, a first limit hole 13 and a second limit hole 14 are symmetrically communicated with the middle of the cavity structure on the housing 1, the upper part of the same end hole wall of the two limit holes is provided with a first inclined surface wall 17, and a positioning block 15 is further provided in the cavity structure; two first fixture blocks 151 and two second fixture blocks 152 are symmetrically arranged on the positioning block 15, the corresponding positions of the first fixture block 151, the second fixture block 152 and the positioning block 15 at the corresponding ends surround to form a fixture groove 161, and the corresponding positions of the second fixture block 152 and the positioning block 15 surround to form an opening groove 162.

A locking device is inserted into the first insertion hole 11 and comprises a push plate 21, and a tooth groove is formed in the outer side surface of the push plate 21; a limiting block 22 is arranged at the upper end of the push plate 21, a first clamping strip 23 and a second clamping strip 24 which horizontally extend out are arranged at the lower end of the push plate, an arc groove matched with the outer diameter of the male plug is arranged on one side of the limiting block 22, a yielding groove 221 is respectively arranged on the left side and the right side of the notch of the arc groove, a horizontally extending convex block 26 is arranged on the outer side of each yielding groove 221, and a yielding inclined section 261 is arranged on each convex block 26; the lower end of the limiting block 22 is provided with a fixed block 27, the fixed block 27 and the limiting block 22 form a step structure with a wide upper part and a narrow lower part, the fixed block 27 is provided with a limiting groove 271 concentric with the arc groove, and the lower end surface of the fixed block 27 is provided with a lightening hole 272.

Extension lines of the extending ends of the two clamping strips are intersected on a horizontal plane; a first contact block 231 and a first positioning block 232 are sequentially arranged on the inner side wall of the first clamping strip 23 along the extending direction, a first anti-falling block 233 is arranged on the outer side wall of the first clamping strip 23, a first groove 234 is arranged on the inner side wall of the first contact block 231, and a second inclined section 25 is arranged at the upper end of the first contact block 231; second feeler block 241 and second locating piece 242 are equipped with in proper order along the direction of stretching out on the inside wall of second card strip 24, are equipped with second anticreep piece 243 on the lateral wall of this second card strip 24, the inside wall of second feeler block 241 is equipped with second recess 244, and the upper end of this second feeler block 241 also is equipped with one section second oblique section 25, and the locking ware stretches into first jack 11, and when first card strip 23 and second card strip 24 removed the position department of locating piece 15, first locating piece 232 and second locating piece 242 all insert the draw-in groove 161 of corresponding end in advance the joint.

The first contact block 231 and the second contact block 241, the first groove 234 and the second groove 244, the two second inclined sections 25 and the first anti-falling block 233 and the second anti-falling block 243 are symmetrically arranged.

A positioning clamp is inserted into the second jack 12 and comprises an arc-shaped plate 3, a first positioning rod 31 and a second positioning rod 32 which horizontally extend out are arranged at the upper end of the arc-shaped plate 3, and extension lines of extension ends of the two positioning rods are intersected on a horizontal plane; a first positioning boss 311 is arranged on the first positioning rod 31, a first inclined section 33 is arranged on one side of the extending end of the first positioning rod 31, a first extending section 312 extending into the first limiting hole 13 in an inclined manner is arranged on the other side of the extending end of the first positioning rod 31, the first extending section 312 is attached to the first inclined wall 17 in the first limiting hole 13, and a first inserting block 313 is arranged on one side of the first inclined section 33; the second positioning rod 32 is provided with a second positioning boss 321, one side of the extending end of the second positioning rod 32 is also provided with a first inclined section 33, the other side of the extending end of the second positioning rod 32 is provided with a second extending section 322 extending into the second limiting hole 14 in an inclined manner, the second extending section 322 is attached to the first inclined wall 17 in the second limiting hole 14, and one side of the first inclined section 33 is provided with a second inserting block 323.

The first positioning boss 311 and the second positioning boss 321, the two first inclined sections 33, the first extending section 312 and the second extending section 322, and the first insertion block 313 and the second insertion block 323 are symmetrically arranged. The positioning card comprises a first positioning rod 31 and a second positioning rod 32, and a first inclined section 33 is respectively arranged on each of the two positioning rods.

A notch is arranged at one side of the cavity bottom of the cavity structure corresponding to the first insertion hole 11, a first dismounting groove 41 is formed between the notch and the push plate 21 in a surrounding manner, and the first dismounting groove 41 is communicated with a lightening hole 272 on the locking device; a second disassembly groove 42 is formed between one side of the cavity bottom of the cavity structure corresponding to the second insertion hole 12 and the arc-shaped plate 3 in a surrounding manner.

The cavity top of the cavity structure is provided with guide grooves corresponding to the first positioning boss 311 and the second positioning boss 321, the first positioning boss 311 and the second positioning boss 321 are respectively clamped in the guide grooves of the corresponding ends, the groove wall of one side of the guide grooves corresponding to the first insertion hole 11 is a second inclined wall 18, and the slope of the second inclined wall 18 is the same as that of the first inclined wall 17.

After the male plug is inserted, the boss moves from top to bottom and sequentially extrudes the first inclined section 33 and the second inclined section 25, so that the two clamping strips and the two positioning rods are sequentially opened, after the boss moves downwards to the right position, the two positioning rods of the positioning clamp retract and the corresponding positions are attached to the outer side wall of the male plug, the corresponding positions on the two clamping strips slide along the outer side curved surface of the male plug, the two clamping strips move to the corresponding positions of the positioning block 15 for positioning and clamping, and meanwhile, the boss is abutted to the corresponding positions of the limiting block 22 for limiting; when the male plug is dismounted, the two clamping strips are firstly pulled open, the locking device is pulled out, then the two positioning rods are pulled open, and the male plug can be pulled out by giving way to the lug boss.

The using method of the utility model is as follows:

as shown in fig. 1 to 11, in use, when the locking device is inserted into the housing 1 from the first insertion hole 11, and the first locking strip 23 and the second locking strip 24 move to the position of the positioning block 15, the first positioning block 232 and the second positioning block 242 are inserted into the corresponding slots 161 for pre-clamping; at this time, the positioning card is inserted from the second jack 12, the first extension section 312 extends into the first limiting hole 13, the second extension section 322 extends into the second limiting hole 14, the first positioning boss 311 and the second positioning boss 321 are respectively clamped in the guide grooves of the corresponding ends, the first oblique sections 33 of the two positioning rods and the limiting block 22 surround to form a hole-shaped structure for inserting the male plug, and meanwhile, the two second oblique sections 25 on the locking device surround to form a ring-hole-shaped structure.

As shown in a to d of fig. 9, after the male plug is inserted, the boss moves from top to bottom and presses the first inclined section 33, so that the two positioning rods open simultaneously, the first extension section 313 and the second extension section 323 move along the first inclined wall 17 at the corresponding ends, the first positioning boss 311 and the second positioning boss 321 move along the second inclined wall 18 in the guide groove, when the boss moves down to the position of the positioning rod, the two positioning rods move back, because the two positioning rods are symmetrically inclined, the inner side wall at the position of the first inclined section 33 forms an inclined surface relative to the outer side wall of the male plug, when the two first inclined surfaces 33 move back to be attached to the outer side wall of the male plug, the inner side wall of the first inclined section 33 forms a sliding tendency on the outer side wall of the male plug, namely, the positioning card automatically moves into the housing, and is convenient for manual pushing to achieve the purpose of accelerated locking, the inner side walls of the two first inclined sections 33 are attached to the corresponding positions of the outer side wall of the male plug, at this time, a second dismounting groove 42 is enclosed between one side of the cavity bottom of the cavity structure of the housing 1 corresponding to the second insertion hole 12 and the arc plate 3.

Then, the male plug continues to move downwards, the boss extrudes the two second inclined sections 25, and opens the two clamping strips simultaneously, the first positioning block 232 and the second positioning block 242 both move out of the clamping groove 161 at the corresponding end, when the boss moves downwards and leaves the position of the second inclined section 25, the first clamping strip 23 and the second clamping strip 24 move back, because the two clamping strips are symmetrically inclined, the inner side wall of the second inclined section 25 forms an inclined surface relative to the outer side wall of the male plug, when the two second inclined surfaces 25 move back and are attached to the outer side wall of the male plug, the inner side wall of the second inclined section 25 forms a sliding trend on the outer side wall of the male plug, namely, the locking device automatically moves towards the shell, because the two positioning blocks both leave the clamping grooves 161, after the locking device moves towards the shell again, the two positioning blocks move and are clamped and positioned with the open grooves 162 at the corresponding end, at this time, the first insertion block 313 and the second insertion block 323 are respectively inserted and limited with the abdicating groove 221 at the corresponding end, the fixing block 27 and the limiting block 22 form a step structure with a wide top and a narrow bottom, which is just above the boss and also plays a role of anti-falling and limiting, and a notch is arranged at one side of the cavity bottom of the cavity structure of the casing 1 corresponding to the first insertion hole 11, and a first dismounting groove 41 is formed between the notch and the push plate 21 in a surrounding manner (as shown in corresponding positions d in fig. 3, 6, 11 and 9).

If the male plug does not install in place, one condition is, two locating levers are in the open state than initial position in two spacing holes, the locator card is not hard up, another condition is, the boss of male plug steps over the locating lever position, but the card strip does not remove the position to the joint location from the joint in advance with the locating piece, just can see two card strips of locking ware from the casing outside and open outwards, the locking ware is not hard up promptly, two spacing hole positions are convenient for inspect the installation state, can visual inspection from this, convenient quick-witted effect.

When the male plug is dismounted, the two clamping strips are firstly pulled open by an auxiliary tool from the position of the second dismounting groove 42 and the locking device is pulled out, the locking device is moved to the position pre-clamped with the positioning block, the locking device can be prevented from sliding off (as shown in a diagram from d to a in fig. 9), then the two positioning rods are pulled open at the position of the two limiting holes at the same time, the two positioning rods are opened, the positioning clamp moves inwards for one section, the two extending sections and the two positioning lugs on the two positioning rods respectively slide along the first inclined wall 17 and the second inclined wall 18, the male plug can be extracted by giving the boss abdication, the structure is simple and compact, and the whole dismounting process is simple, convenient and quick.

In order to ensure the use strength and the elastic requirements of disassembly and assembly, the locking device and the positioning card are integrally formed by injection molding of a nylon 66 material, the material is the prior art, and the description is omitted.

It should be noted that, in the present embodiment, the slopes of the second sloped wall 18 and the first sloped wall 17 are the same and not unique, and the slope setting of the corresponding position should be convenient for disassembly and assembly according to the use requirement and the structural setting.

The undescribed parts of the present invention are consistent with the prior art and will not be described in detail herein.

The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all equivalent structures made by using the contents of the present specification and the drawings can be directly or indirectly applied to other related technical fields, and are within the scope of the present invention.

Claims

1. The utility model provides a mistake proofing double-locking quick connector, is including male plug and casing (1) that are equipped with the boss, its characterized in that: a cavity structure is arranged in the shell (1), one end of the cavity structure is provided with a first jack (11), the other end of the cavity structure is provided with a second jack (12), a first limiting hole (13) and a second limiting hole (14) are symmetrically communicated with the middle position of the cavity structure on the shell (1), the upper part of the hole wall of the same end of the two limiting holes is provided with a first inclined surface wall (17), and a positioning block (15) is also arranged in the cavity structure; a locking device is inserted into the first jack (11) and comprises a push plate (21), a limiting block (22) is arranged at the upper end of the push plate (21), a first clamping strip (23) and a second clamping strip (24) are arranged at the lower end of the push plate (21), a second inclined section (25) is respectively arranged on each of the two clamping strips, and the corresponding positions of the two clamping strips are pre-clamped with the corresponding positions on the positioning block (15); a positioning card is inserted into the second jack (12), the positioning card comprises a first positioning rod (31) and a second positioning rod (32), and a first inclined section (33) is arranged on each of the two positioning rods; after the male plug is inserted, the boss moves from top to bottom and sequentially extrudes the first inclined section (33) and the second inclined section (25), so that the two clamping strips and the two positioning rods are sequentially opened, after the boss moves down to the right position, the two positioning rods of the positioning clamp retract and the corresponding positions are attached to the outer side wall of the male plug, the corresponding positions on the two clamping strips slide along the outer side curved surface of the male plug, the two clamping strips move to the corresponding positions of the positioning block (15) for positioning and clamping, and meanwhile, the boss is abutted against and limited to the corresponding positions of the limiting block (22); when the male plug is dismounted, the two clamping strips are firstly pulled open, the locking device is pulled out, then the two positioning rods are pulled open, and the male plug can be pulled out by giving way to the lug boss.

2. A fail-safe double lock quick connector, according to claim 1, wherein: the positioning block (15) is symmetrically provided with two first fixture blocks (151) and two second fixture blocks (152), the corresponding positions of the first fixture blocks (151), the second fixture blocks (152) and the positioning block (15) at the corresponding ends surround to form a fixture groove (161), and the corresponding positions of the second fixture blocks (152) and the positioning block (15) surround to form an opening groove (162).

3. A fail-safe double lock quick connector, according to claim 1, wherein: an arc groove matched with the outer diameter of the male plug is formed in one side of the limiting block (22), a yielding groove (221) is formed in each of the left side and the right side of the opening of the arc groove, a horizontally extending convex block (26) is arranged on the outer side of each yielding groove (221), and a yielding inclined section (261) is arranged on each convex block (26); the lower end of the limiting block (22) is provided with a fixing block (27), the fixing block (27) and the limiting block (22) form a step structure with a wide upper part and a narrow lower part, a limiting groove (271) concentric with the arc groove is formed in the fixing block (27), and the lower end face of the fixing block (27) is provided with a lightening hole (272).

4. A fail-safe double lock quick connector, according to claim 1, wherein: a first clamping strip (23) and a second clamping strip (24) which horizontally extend out are arranged on the limiting block (22), and extension lines of extension ends of the two clamping strips on a horizontal plane are intersected; a first contact block (231) and a first positioning block (232) are sequentially arranged on the inner side wall of the first clamping strip (23) along the extending direction, a first anti-falling block (233) is arranged on the outer side wall of the first clamping strip (23), a first groove (234) is arranged on the inner side wall of the first contact block (231), and a section of second inclined section (25) is arranged at the upper end of the first contact block (231); be equipped with second feeler block (241) and second locating piece (242) along the direction of stretching out in proper order on the inside wall of second card strip (24), be equipped with second anticreep piece (243) on the lateral wall of this second card strip (24), the inside wall of second feeler block (241) is equipped with second recess (244), and the upper end of this second feeler block (241) also is equipped with one section second oblique section (25), and the locking ware stretches into first jack (11), and when first card strip (23) and second card strip (24) removed the position department of locating piece (15), first locating piece (232) and second locating piece (242) all insert the draw-in groove (161) interior joint in advance of corresponding end.

5. A fail-safe double lock quick connector, according to claim 4, wherein: the first contact block (231) and the second contact block (241), the first groove (234) and the second groove (244), the two second inclined sections (25) and the first anti-falling block (233) and the second anti-falling block (243) are symmetrically arranged.

6. A fail-safe double lock quick connector, according to claim 1, wherein: the positioning clamp comprises an arc-shaped plate (3), a first positioning rod (31) and a second positioning rod (32) which horizontally extend out are arranged at the upper end of the arc-shaped plate (3), and extension lines of extension ends of the two positioning rods are intersected on the horizontal plane; a first positioning boss (311) is arranged on the first positioning rod (31), one side of the extending end of the first positioning rod (31) is provided with a first inclined section (33), the other side of the extending end of the first positioning rod is provided with a first extending section (312) extending into the first limiting hole (13) in an inclined manner, the first extending section (312) is attached to the first inclined surface wall (17) in the first limiting hole (13), and one side of the first inclined section (33) is provided with a first inserting block (313); the second positioning rod (32) is provided with a second positioning boss (321), one side of the extending end of the second positioning rod (32) is also provided with a first inclined section (33), the other side of the extending end of the second positioning rod is provided with a second extending section (322) extending into the second limiting hole (14) in an inclined mode, the second extending section (322) is attached to a first inclined wall (17) in the second limiting hole (14), and one side of the first inclined section (33) is provided with a second inserting block (323).

7. A fail-safe double lock quick connector, according to claim 6, wherein: the positioning structure is characterized in that the first positioning boss (311) and the second positioning boss (321), the two first inclined sections (33), the first extending section (312) and the second extending section (322) and the first inserting block (313) and the second inserting block (323) are symmetrically arranged.

8. A fail-safe double lock quick connector, according to claim 1, wherein: tooth grooves are formed in the outer side surface of the push plate (21).

9. A fail-safe double lock quick connector, according to claim 6, wherein: a notch is formed in one side, corresponding to the first insertion hole (11), of the cavity bottom of the cavity structure, a first dismounting groove (41) is formed between the notch and the push plate (21) in a surrounding mode, and the first dismounting groove (41) is communicated with a lightening hole (272) in the locking device; a second disassembly groove (42) is formed between one side of the cavity bottom of the cavity structure corresponding to the second insertion hole (12) and the arc-shaped plate (3) in a surrounding manner.

10. A fail-safe double lock quick connector, according to claim 6, wherein: the cavity top of cavity structure corresponds the position department of first location boss (311) and second location boss (321) and all is equipped with the guide way, first location boss (311) and second location boss (321) joint respectively in the guide way that corresponds the end, two the cell wall that the guide way corresponds first jack (11) direction one side is second bevel wall (18), the slope of second bevel wall (18) and first bevel wall (17) is the same.