CN111600161A - Rectangular low-voltage connector and mounting method thereof - Google Patents

Abstract

The invention discloses a rectangular low-voltage connector which comprises a plug sheath, a secondary locking piece, a sealing ring, a sealing gasket, a rear cover and a plurality of terminals, wherein the plug sheath consists of a waist-hole-shaped lower end wall, a waist-hole-shaped outer side wall and a waist-hole-shaped upper end wall; the secondary locking piece is provided with a primary reverse lock catch, a limiting stop lug, two secondary lock catches and a plurality of second lock holes; the rear cover is provided with a plurality of through holes, clamping edges and a third lock hook, the sealing gasket is provided with a plurality of convex holes, the terminals sequentially comprise a plug part, a hanging point part and a line pressing part from top to bottom, the rear cover is arranged on the lower end wall of the plug sheath, the secondary lock piece is arranged in the upper end wall of the plug sheath, and the terminals with pressed lines are inserted into the plug sheath.

Description

Rectangular low-voltage connector and mounting method thereof

Technical Field

The invention belongs to the technical field of low-voltage connectors, and particularly relates to a rectangular low-voltage connector and an installation method thereof.

Background

A conventional electrical connector, which is generally a pin connector, generally includes a body, a conductive terminal accommodated in the body, and a housing sleeved outside the body. The body is provided with a containing space for containing the contact part of the conductive terminal and a butting pin butted with the contact part.

In the existing rectangular low-voltage connector, when a terminal is inserted, the depth of a lock hole of a secondary locking piece is too large, and a hanging point of the terminal easily exceeds an elastic hook, so that a wire pressing part of the terminal is clamped by the elastic hook, therefore, the terminal can not retreat any more, and when the secondary locking piece is pressed, the terminal is forced to be pressed downwards, and the elastic hook is damaged; and the couple damages and just needs to dismantle the change terminal again, and frequent dismouting terminal may lead to sealed damage of filling up, leads to waterproof function to reduce, and the degree of depth stroke of the lockhole of secondary latch fitting does not have limiting displacement, still can lead to when inserting the terminal, needs very carefully, can not let the line ball portion card of terminal on location elastic hook, so, will lead to under the whole inefficiency, and the condition of incessantly doing over again exists.

Disclosure of Invention

The invention provides a rectangular low-voltage connector and an installation method thereof, which enable terminals to be easier to install, enable the positions of the installed terminals to be in the optimal state and improve the yield of the rectangular low-voltage connector.

In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a rectangle low pressure connector, includes plug sheath, secondary latch fitting, sealing washer, sealed pad, back lid and a plurality of terminal, its characterized in that:

the plug sheath is composed of a waist-hole-shaped lower end wall, a waist-hole-shaped outer side wall and a waist-hole-shaped upper end wall, a terminal locking plate is arranged inside the plug sheath, a plurality of first locking holes are formed in the terminal locking plate, a plurality of positioning elastic hooks of terminals are arranged at the inserting ends of the first locking holes, the upper end wall is composed of a high side plate, a low side plate and a primary locking hook, the low side plate is located at four corners of the upper end wall, the primary locking hook is located at the center of the left waist and the right waist of the upper end wall, the high side plate is located at the upper side and the lower side of the upper end wall, secondary locking grooves are formed in the inner wall of the low side plate, and a rectangular through;

the secondary locking piece is provided with a plurality of second locking holes corresponding to the first locking holes, semicircular baffle blocks are symmetrically arranged at the inserting end of the upper part of each second locking hole, fan-shaped sheath bosses are arranged at four corners of the secondary locking piece, and a primary reverse lock catch, a limiting baffle lug and two secondary lock catches are symmetrically arranged at the left end and the right end of the secondary locking piece;

the rear cover is provided with a plurality of through holes corresponding to the first lock holes, the upper side and the lower side of the rear cover are provided with clamping edges, the center positions of the waist parts at the left side and the right side of the rear cover are provided with third lock hooks, and the sealing gasket is provided with a plurality of convex holes corresponding to the through holes;

the terminal comprises a plug part, a hanging point part and a line pressing part from top to bottom in sequence, the diameter of the hanging point part is smaller than that of the plug part and the line pressing part, and a right-angle section is arranged at the joint of the hanging point part and the line pressing part and can become a new hanging point;

the sealing ring is arranged between the outer side wall and the upper end wall of the plug sheath, the sealing gasket is arranged in the upper end wall, the rear cover is arranged on the lower end wall of the plug sheath, the clamping edge is buckled on the outer side of the lower end wall of the plug sheath, the third latch hook is buckled in the rectangular through hole latch groove from the inner side of the lower end wall to the outside, the secondary latch piece is arranged in the upper end wall of the plug sheath, the fan-shaped sheath boss is buckled at the outer side of the low side plate, the primary lock hook of the plug sheath is buckled with the primary reverse lock catch to complete the first locking step, the secondary lock catch is buckled in the secondary lock groove to complete the second-step locking, the terminal with the pressed wire is arranged in the plug sheath, the plug portion of the terminal with the pressed wire sequentially penetrates through the through hole, the convex hole and the first lock hole to reach the second lock hole, and the hanging point portion of the terminal is clamped at the terminal positioning elastic hook.

Preferably, the lower end wall is injection moulded integrally with an outer side wall and an upper end wall, the outer side wall surrounding the outside of the upper end wall.

Preferably, the aperture of the second lock hole gradually shrinks from bottom to top to form a circular truncated cone shape.

Preferably, the inner side surface of the rear cover is provided with a plurality of convex points, the outer side surface of the sealing gasket is provided with a plurality of concave points, and the convex points are matched with the concave points.

Preferably, the two secondary lock catches are symmetrically arranged on two sides of the primary reverse lock catch, and the limiting stop lug is positioned on the outer side of the right opposite surface of the hook.

A method for mounting a rectangular low-voltage connector is characterized in that: the above-mentioned

The first step is as follows: the sealing gasket is installed into the lower end wall of the plug sheath with the smooth surface facing downwards;

the second step is that: the rear cover is buckled on the lower end wall of the plug sheath, and a third lock hook on the rear cover is buckled in the rectangular through hole lock groove from the inner side of the lower end wall to the outside;

the third step: installing a sealing ring between the outer side wall and the upper end wall of the plug sheath;

the fourth step: arranging a secondary locking piece in the upper end wall of the plug sheath, sleeving the fan-shaped sheath boss on the outer side of the low side plate, and buckling a primary locking hook of the plug sheath with a primary reverse locking buckle to complete the first-step locking, wherein the secondary locking buckle is positioned at the upper end of the low side plate;

the fifth step: the terminal of the pressed wire is arranged in the plug sheath, the plug part of the terminal of the pressed wire sequentially penetrates through the through hole, the convex hole and the first lock hole to reach the second lock hole, and the hanging point part of the terminal is clamped at the terminal positioning elastic hook;

and a sixth step: and the secondary locking piece is pressed downwards, the secondary lock catch is clamped into the secondary locking groove to complete the second-step locking, and the fan-shaped sheath boss is completely clamped on the low side plate to complete the locking and limiting.

The beneficial effect of adopting above technical scheme is:

the hole diameter of the secondary lock hole is gradually contracted from bottom to top to be in a round table shape, the axial lead of the terminal is automatically positioned on the same straight line with the axial lead of the secondary lock hole, and the semicircular ring stop block is matched with the hole depth stroke of the secondary lock hole, so that the terminal can be inserted into the low-voltage connector in a blind manner, no matter how the terminal is inserted, the right-angled section of the joint of the hanging point part and the line pressing part of the terminal cannot be clamped with the positioning elastic hook, the positioning elastic hook can be always positioned at the hanging point part, and the positioning elastic hook is forcibly installed when the secondary lock catch of the secondary lock piece does not enter the secondary lock groove, so that the right-angled section of the terminal crushes the positioning elastic hook;

secondly, when the terminal is inserted and the secondary locking piece is pressed to reach a second-step locking state, the semicircular baffle block can downwards press the plug part of the terminal, so that the hanging point parts of all the terminals can automatically return to the positioning elastic hook, all the terminals can automatically return to the optimal position, the pulling force of the terminal is enhanced, and the terminal is not easy to return in normal use;

and thirdly, the secondary locking piece and the plug sheath are provided with a primary locking hook, a primary reverse locking hook, a locking device of a limiting blocking lug, a secondary locking buckle and a locking device of a secondary locking groove, so that the secondary locking piece and the plug sheath are not easy to separate from each other in the equipment transportation process.

Drawings

FIG. 1 is a schematic structural view of the present invention;

FIG. 2 is an exploded view of the structure of the present invention;

FIG. 3 is a schematic view of the primary lock of the present invention in place;

FIG. 4 is a schematic view of the secondary lock of the present invention in place;

FIG. 5 is a top view of the structure of the present invention;

FIG. 6 is a cross-sectional view taken in the direction A-A of FIG. 5 with the terminal in the optimal position once the lock of the present invention is in place;

FIG. 7 is a cross-sectional view taken in the direction B-B of FIG. 5 with the terminal in the optimal position after the primary lock of the present invention is locked in place;

FIG. 8 is a cross-sectional view taken in the direction B-B of FIG. 5 with the terminal in the worst position after the primary lock of the present invention is locked in place;

FIG. 9 is a cross-sectional view taken in the direction A-A of FIG. 5 after the secondary lock of the present invention is locked in place;

FIG. 10 is a cross-sectional view taken in the direction B-B of FIG. 5 after the secondary lock of the present invention is locked in place;

FIG. 11 is a schematic view of the construction of the plug sheath of the present invention;

FIG. 12 is a cross-sectional view taken along line C-C of FIG. 11;

FIG. 13 is a cross-sectional view taken in the direction D-D of FIG. 11;

FIG. 14 is a schematic view of the construction of the secondary lock of the present invention;

FIG. 15 is a cross-sectional view taken in the direction E-E of FIG. 14;

fig. 16 is a schematic view of the structure of the gasket of the present invention.

Wherein, 1-plug sheath, 2-secondary locking piece, 3-sealing ring, 4-sealing pad, 5-rear cover, 6-terminal, 7-lower end wall, 8-outer side wall, 9-upper end wall, 10-terminal locking plate, 11-first locking hole, 12-positioning elastic hook, 13-high side plate, 14-low side plate, 15-primary locking hook, 16-secondary locking groove, 17-rectangular through hole locking groove, 18-second locking hole, 19-semicircular baffle block, 20-fan-shaped sheath boss, 21-primary reverse locking hook, 22-limiting baffle lug, 23-secondary locking hook, 24-through hole, 25-clamping edge, 26-third locking hook, 27-convex hole, 28-plug part, 29-hanging point part, 30-pressing line part, 31-convex points and 32-concave points.

Detailed Description

The following detailed description of the embodiments of the present invention will be given with reference to the accompanying drawings for a purpose of helping those skilled in the art to more fully, accurately and deeply understand the concept and technical solution of the present invention and to facilitate its implementation.

As shown in fig. 1 to 16, the present invention is a rectangular low-voltage connector, which comprises a plug sheath 1, a secondary locking member 2, a sealing ring 3, a sealing gasket 4, a rear cover 5 and a plurality of terminals 6, and is characterized in that:

the plug sheath 1 comprises a waist-hole-shaped lower end wall 7, a waist-hole-shaped outer side wall 8 and a waist-hole-shaped upper end wall 9, a terminal locking plate 10 is arranged inside the plug sheath 1, a plurality of first locking holes 11 are formed in the terminal locking plate 10, positioning elastic hooks of a plurality of terminals 6 are arranged at the inserting ends of the first locking holes 11, the upper end wall 9 comprises a high side plate 13, a low side plate 14 and a primary locking hook 15, the low side plate 14 is located at the four corners of the upper end wall 9, the primary locking hook 15 is located at the center of the left waist and the right waist of the upper end wall 9, the high side plate 13 is located at the upper side and the lower side of the upper end wall 9, secondary locking grooves 16 are formed in the inner wall of the low side plate 14, and a rectangular through hole locking groove 17 is formed;

a plurality of second lock holes 18 corresponding to the first lock holes 11 are formed in the secondary lock piece 2, semicircular stop blocks 19 are symmetrically arranged at the inserting end of the upper portion of each second lock hole 18, fan-shaped sheath bosses 20 are arranged at four corners of the secondary lock piece 2, and a primary reverse lock 21, a limiting stop lug 22 and two secondary lock 23 are symmetrically arranged at the left end and the right end of the secondary lock piece 2;

the rear cover 5 is provided with a plurality of through holes 24 corresponding to the first lock holes 11, the upper and lower sides of the rear cover 5 are provided with clamping edges 25, the center positions of the waist parts at the left and right sides of the rear cover 5 are provided with third lock hooks 26, and the sealing gasket 4 is provided with a plurality of convex holes 27 corresponding to the through holes 24;

the terminal 6 is provided with a plug part 28, a hanging point part 29 and a line pressing part 30 from top to bottom in sequence, the diameter of the hanging point part 29 is smaller than that of the plug part 28 and the line pressing part 30, the joint of the hanging point part 29 and the plug part 28 is a small-angle chamfered surface, the front end of the hanging point part 29 is cylindrical, the middle part of the hanging point part is in a circular truncated cone shape, the rear end of the hanging point part 29 is cylindrical, the diameters of the front end and the rear end of the hanging point part 29 are equal to the diameters of the upper surface and the lower surface of the circular truncated cone shape, the diameter of the front end of the hanging point part 29 is smaller than that of the rear end, and the joint of the hanging point part 29 and the line pressing part 30 is provided;

the sealing ring 3 is arranged between the outer side wall 8 and the upper end wall 9 of the plug sheath 1, the sealing gasket 4 is arranged in the upper end wall 9, the rear cover 5 is arranged at the lower end wall 7 of the plug sheath 1, the clamping edge 25 is buckled outside the lower end wall 7 of the plug sheath 1, the third locking hook 26 is buckled in the rectangular through hole locking groove 17 from the inner side of the lower end wall 7 to the outside, the secondary locking piece 2 is arranged in the upper end wall 9 of the plug sheath 1, the fan-shaped sheath boss 20 is buckled outside the lower side plate 14, the primary locking hook 15 of the plug sheath 1 is buckled on the primary reverse locking hook 21 to complete the first-step locking, the secondary locking piece 23 is buckled in the secondary locking groove 16 to complete the second-step locking, the pressed terminal 6 is arranged in the plug sheath 1, the plug part 28 of the pressed terminal 6 sequentially passes through the through hole 24, the convex hole 27 and the first locking hole 11 to reach the second locking hole 18, the hanging point part 29 of the terminal 6 is clamped at the position of the elastic hook 12 for positioning the terminal 6.

In this embodiment, the lower end wall 7 is injection molded integrally with an outer side wall 8 and an upper end wall 9, the outer side wall 8 surrounding the outer side of the upper end wall 9.

In this embodiment, the aperture of the second locking hole 18 gradually shrinks from bottom to top to form a circular truncated cone, so that the inserted terminal 6 can automatically return, and the axis of the terminal 6 and the axis of the second locking hole 18 are on the same axis, and the position correction is not required.

In this embodiment, the inner side surface of the rear cover 5 is provided with a plurality of protruding points 31, the outer side surface of the sealing gasket 4 is provided with a plurality of concave points 32, the protruding points 31 are matched with the concave points 32, the sealing gasket 4 installed in the lower end wall 7 is fixed, the sealing gasket 4 is not likely to move, and the axial lines of the through hole 24, the convex hole 27, the first locking hole 11 and the second locking hole 18 are on the same axial line.

In this embodiment, the two secondary locking catches 23 are symmetrically disposed on two sides of the primary reverse locking catch 21, and the limiting stop lug 22 is located on the outer side of the opposite surface of the hook.

Based on the above, the rectangular low-voltage connector of the invention has the beneficial effects that:

firstly, the aperture of the secondary lock hole is gradually contracted from bottom to top to be in a circular truncated cone shape, the axial lead of the terminal 6 is automatically positioned on the same straight line with the axial lead of the secondary lock hole, and the semicircular ring stop block 19 is matched with the hole depth stroke of the secondary lock hole, so that the terminal 6 can be inserted into the low-voltage connector in a blind manner, no matter how the terminal is inserted, the right-angled section of the joint of the hanging point part 29 and the line pressing part 30 of the terminal 6 cannot be clamped with the positioning elastic hook 12, the positioning elastic hook 12 can be always positioned at the hanging point part 29, and the secondary lock catch 23 of the secondary lock piece 2 cannot be forcibly installed when entering the secondary lock groove 16, so that the right-angled section of the terminal 6 crushes the positioning elastic hook 12;

secondly, when the terminal 6 is inserted and the secondary locking piece 2 is pressed to reach the second-step locking state, the semicircular baffle 19 can press the plug part 28 of the terminal 6 downwards, so that the hanging point parts 29 of all the terminals 6 can be automatically reset on the positioning elastic hooks 12, all the terminals 6 can be automatically reset to the optimal positions, the pulling force of the terminal 6 is enhanced, and the terminal 6 is not easy to retreat in normal use;

and thirdly, the secondary locking piece 2 and the locking device of the primary locking hook 15 and the primary locking hook on the plug sheath 1, the locking device of the primary locking hook 22, the secondary locking hook 23 and the locking device of the secondary locking groove 16 can ensure that the secondary locking piece 2 and the plug sheath 1 are not easy to separate from each other in the equipment transportation process.

The following specific working modes are illustrated by specific examples:

example 1:

the first step is as follows: the sealing gasket 4 is installed into the lower end wall 7 of the plug sheath 1 in a way that the smooth surface faces downwards;

the second step is that: the rear cover 5 is buckled on the lower end wall 7 of the plug sheath 1, a clamping edge 25 of the rear cover 5 can be clamped on the lower end wall 7, when the rear cover 5 is installed in a downward pressing mode, the rear cover 5 is guaranteed to have a limit position when being pressed downward, a third locking hook 26 on the rear cover 5 is buckled in the rectangular through hole locking groove 17 from the inner side of the lower end wall 7 to the outside, and the rear cover 5 is guaranteed to be installed stably;

the third step: the sealing ring 3 is arranged between the outer side wall 8 and the upper end wall 9 of the plug sheath 1;

the fourth step: as shown in fig. 3 and 6-7, the secondary locking element 2 is first installed into the upper end wall 9 of the plug sheath 1 along the high side plate 13, the lower portion of the fan-shaped sheath boss 20 is sleeved outside the low side plate 14, at this time, the primary locking hook 15 of the plug sheath 1 is clamped to pass over the limit stop lug 22 to buckle the primary counter locking hook 21, and the primary locking is completed, at this time, the secondary locking hook 23 is located at the upper end of the low side plate 14 and does not enter the secondary locking groove 16;

the fifth step: as shown in fig. 4 and 6-10, the terminal 6 with pressed wire is inserted into the rectangular low-voltage connector, the plug portion 28 of the terminal 6 with pressed wire passes through the through hole 24, the convex hole 27 and the first locking hole 11 in sequence to reach the second locking hole 18, if the inserted terminal 6 is located at the optimal position, the hanging point portion 29 of the terminal 6 is clamped at the positioning elastic hook 12, and the upper end surface of the plug portion 28 of the terminal 6 is at a distance from the semicircular ring stop 19 of the second locking hole 18;

if the inserted terminal 6 is located at the worst position, the upper end surface of the plug part 28 of the terminal 6 is pushed by the semicircular ring stopper 19, the hanging point part 29 of the terminal 6 exceeds the position of the positioning elastic hook 12, and when the terminal is in the first-step locking state, the stroke height of the second locking hole 18 of the secondary locking piece 2 can ensure that the right-angle section of the terminal 6 cannot be blocked by the positioning elastic hook 12 even if the terminal 6 is located at the worst position when being inserted, the right-angle section can not be forcibly reset downwards to cause the damage of the positioning elastic hook 12, and the positioning elastic hook 12 can be always located between the hanging point part 29, the hanging point part 29 and the right-angle section.

And a sixth step: press down secondary latch fitting 2, block secondary hasp 23 into secondary locked groove 16, accomplish the locking of second step, fan-shaped sheath boss 20 is located on low curb plate 14 completely this moment, when can guaranteeing secondary latch fitting 2 installation stability, can also control the degree of freedom of secondary latch fitting 2 up-and-down direction, the in-process that secondary latch fitting 2 pressed down, if terminal 6 is located the optimum position, terminal 6 plug part 28's up end can be being laminated to semicircle ring dog 19 on the final second lockhole 18, if terminal 6 is located the worst state, semicircle ring dog 19 can be pressed terminal 6 and move down to the optimum position together, thereby stop the degree of freedom about terminal 6, let all location elastic hook 12 all block in hanging some portion 29 of terminal 6.

Example 2:

if the terminal 6 is damaged and needs to be maintained, the force can be applied on the fan-shaped sheath boss 20, so that the secondary lock catch 23 can be conveniently pulled out from the secondary lock groove 16, the secondary lock part 2 is slowly pulled out to the first-step locking state, then the limiting stop lug 22 is slightly pried, the primary lock hook 15 can be separated from the primary anti-lock hook, the secondary lock part 2 is taken out from the upper end wall 9 of the plug sheath 1, the positioning elastic hook 12 of the terminal 6 to be replaced is then opened by a thin iron stick, the terminal 6 is then slowly taken out from the whole connector by pulling, the secondary lock part 2 is firstly tried to be mounted to the first-step locking state again, if other good terminals 6 can smoothly enter the corresponding second lock holes 18, the good terminal 6 to be replaced is then inserted into the corresponding hole positions, if other good terminals 6 can not smoothly enter the corresponding second lock holes 18, the terminal cannot be operated after repeated attempts, it is necessary to remove all the terminals 6, install the secondary locking member 2 in the first-step locking state, then reinsert the terminals 6, and finally press the secondary locking member 2 into the second-step locking state to complete the repair and replacement.

The present invention has been described in connection with the accompanying drawings, and it is to be understood that the invention is not limited to the specific embodiments described above, but is intended to cover various insubstantial modifications of the invention based on the principles and technical solutions of the invention; the present invention is not limited to the above embodiments, and can be modified in various ways.

Claims (6)

1. The utility model provides a rectangle low pressure connector, includes plug sheath (1), secondary latch fitting (2), sealing washer (3), sealed pad (4), back lid (5) and a plurality of terminal (6), its characterized in that:

the plug sheath (1) consists of a waist-hole type lower end wall (7), a waist-hole type outer side wall (8) and a waist-hole type upper end wall (9), a terminal locking plate (10) is arranged in the plug sheath (1), a plurality of first locking holes (11) are arranged on the terminal locking plate (10), a plurality of positioning elastic hooks of the terminals (6) are arranged at the inserting end of the first locking holes (11), the upper end wall (9) is composed of a high side plate (13), a low side plate (14) and a primary latch hook (15), the low side plates (14) are positioned at four corners of the upper end wall (9), the primary locking hooks (15) are positioned at the center positions of the left waist and the right waist of the upper end wall (9), the high side plates (13) are positioned at the upper and lower sides of the upper end wall (9), the inner walls of the low side plates (14) are provided with secondary locking grooves (16), a rectangular through hole locking groove (17) is formed in the waist position of the lower end wall (7);

a plurality of second lock holes (18) corresponding to the first lock holes (11) are formed in the secondary lock piece (2), semicircular ring stop blocks (19) are symmetrically arranged at the inserting end of the upper portion of each second lock hole (18), fan-shaped sheath bosses (20) are arranged at four corners of the secondary lock piece (2), and primary reverse lock catches (21), limiting stop lugs (22) and two secondary lock catches (23) are symmetrically arranged at waist positions of the left end and the right end of the secondary lock piece (2);

a plurality of through holes (24) corresponding to the first lock holes (11) are formed in the rear cover (5), clamping edges (25) are arranged on the upper side and the lower side of the rear cover (5), third lock hooks (26) are arranged at the center positions of the waist parts on the left side and the right side of the rear cover (5), and a plurality of convex holes (27) corresponding to the through holes (24) are formed in the sealing gasket (4);

the terminal (6) comprises a plug part (28), a hanging point part (29) and a line pressing part (30) from top to bottom in sequence, the diameter of the hanging point part (29) is smaller than that of the plug part (28) and the line pressing part (30), and a right-angle section is arranged at the joint of the hanging point part (29) and the line pressing part (30), and can become a new hanging point;

the sealing ring (3) is arranged between the outer side wall (8) and the upper end wall (9) of the plug sheath (1), the sealing gasket (4) is arranged in the upper end wall (9), the rear cover (5) is arranged at the lower end wall (7) of the plug sheath (1), the clamping edge (25) is buckled at the outer side of the lower end wall (7) of the plug sheath (1), the third locking hook (26) is buckled in the rectangular through hole locking groove (17) from the inner side of the lower end wall (7) to the outside, the secondary locking piece (2) is arranged in the upper end wall (9) of the plug sheath (1), the fan-shaped sheath boss (20) is buckled at the outer side of the lower side plate (14), the primary locking hook (15) of the plug sheath (1) is buckled in the primary reverse locking buckle (21) to complete the first-step locking, the secondary locking buckle (23) is buckled in the secondary locking groove (16) to complete the second-step locking, the pressed terminal (6) is arranged in the plug sheath (1), a plug portion (28) of the pressed terminal (6) sequentially penetrates through the through hole (24), the convex hole (27) and the first lock hole (11) to reach the second lock hole (18), and a hanging point portion (29) of the terminal (6) is clamped at the position of the terminal (6) positioning elastic hook (12).

2. A rectangular low-voltage connector as claimed in claim 1, wherein: the lower end wall (7) is integrally injection-molded with an outer side wall (8) and an upper end wall (9), and the outer side wall (8) surrounds the outer side of the upper end wall (9).

3. A rectangular low-voltage connector as claimed in claim 1, wherein: the aperture of the second lock hole (18) is gradually contracted from bottom to top to form a circular truncated cone.

4. A rectangular low-voltage connector as claimed in claim 1, wherein: the inner side surface of the rear cover (5) is provided with a plurality of salient points (31), the outer side surface of the sealing gasket (4) is provided with a plurality of concave points (32), and the salient points (31) are matched with the concave points (32).

5. A rectangular low-voltage connector as claimed in claim 1, wherein: the two secondary lock catches (23) are symmetrically arranged on two sides of the primary reverse lock catch (21), and the limiting stop lugs (22) are located on the outer side of the right opposite side of the hook.

6. A method for mounting a rectangular low-voltage connector is characterized in that: the above-mentioned

The first step is as follows: the sealing gasket (4) is installed into the lower end wall (7) of the plug sheath (1) in a way that the smooth surface faces downwards;

the second step is that: the rear cover (5) is buckled on the lower end wall (7) of the plug sheath (1), and a third locking hook (26) on the rear cover (5) is buckled in the rectangular through hole locking groove (17) from the inner side of the lower end wall (7) to the outside;

the third step: the sealing ring (3) is arranged between the outer side wall (8) and the upper end wall (9) of the plug sheath (1);

the fourth step: arranging a secondary locking piece (2) in an upper end wall (9) of a plug sheath (1), sleeving a fan-shaped sheath boss (20) on the outer side of a low side plate (14), clamping a primary locking hook (15) of the plug sheath (1) with a primary reverse locking buckle (21) to complete primary locking, and then positioning a secondary locking buckle (23) at the upper end of the low side plate (14);

the fifth step: the terminal (6) with the pressed wire is arranged in the plug sheath (1), a plug part (28) of the terminal (6) with the pressed wire sequentially penetrates through the through hole (24), the convex hole (27) and the first lock hole (11) to reach the second lock hole (18), and a hanging point part (29) of the terminal (6) is clamped at the position of the terminal (6) positioning elastic hook (12);

and a sixth step: and the secondary locking piece (2) is pressed downwards, the secondary lock catch (23) is clamped into the secondary locking groove (16) to complete the second-step locking, and the fan-shaped sheath boss (20) is completely clamped on the low side plate (14) to complete the locking and limiting.

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