CN111600161B - 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 type lower end wall, a waist hole type outer side wall and a waist hole type upper end wall; the secondary locking piece is provided with a primary anti-lock catch, a limiting stop lug, two secondary lock catches and a plurality of second lock holes; the invention discloses a plug with a plurality of through holes, clamping edges and a third lock hook, wherein the sealing gasket is provided with a plurality of convex holes, a terminal is sequentially provided with a plug part, a hanging point part and a line pressing part from top to bottom, the rear cover is arranged at the lower end wall of a plug sheath, a secondary lock part is arranged in the upper end wall of the plug sheath, and the terminal with a pressed line is 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

The conventional electrical connector, generally a pin connector, generally has a body, a conductive terminal accommodated in the body, and a housing sleeved outside the body. The body is provided with an accommodating space for accommodating a contact part of the conductive terminal and a butt joint 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 lock piece is too large, and the hanging point of the lock hole easily exceeds an elastic hook, so that the line pressing part of the terminal is clamped by the elastic hook, and therefore, the terminal can not be retreated any more, and when the secondary lock piece is pressed, the terminal is forced to be pressed downwards, and the elastic hook is damaged; the hook is damaged, the terminal needs to be disassembled and replaced again, the terminal is frequently disassembled and assembled, the sealing gasket is possibly damaged, the waterproof function is reduced, the depth stroke of the lock hole of the secondary lock piece is not limited, the terminal is inserted, the terminal is required to be careful, the line pressing part of the terminal cannot be clamped on the positioning elastic hook, and therefore the whole efficiency is low, and the condition of continuous reworking exists.

Disclosure of Invention

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

In order to achieve the above purpose, the technical scheme adopted by the invention is as follows: the utility model provides a rectangle low voltage 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 consists of a waist hole type lower end wall, a waist hole type outer side wall and a waist hole type upper end wall, a terminal locking plate is arranged in 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-out ends of the first locking holes, the upper end wall consists of a high side plate, a low side plate and primary locking hooks, the low side plate is positioned at four corners of the upper end wall, the primary locking hooks are positioned at the left waist center position and the right waist center position of the upper end wall, the high side plate is positioned at the upper side position and the lower side position of the upper end wall, secondary locking grooves are formed in the inner wall of the low side plate, and rectangular through hole locking grooves are formed in the waist position of the lower end wall;

the secondary locking piece is provided with a plurality of second locking holes corresponding to the first locking holes, semicircular stop blocks are symmetrically arranged at the upper inserting ends of the second locking holes, fan-shaped sheath bosses are arranged at four corners of the secondary locking piece, and primary anti-locking catches, limiting stop lugs and two secondary locking 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, clamping edges are arranged on the upper side and the lower side of the rear cover, third lock hooks are arranged in the center positions of the waist parts of the left side and the right side of the rear cover, 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, wherein 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 be a new hanging point;

The sealing washer sets up between the lateral wall of plug sheath and upper end wall, the sealed pad sets up in the upper end wall, the back lid sets up in the lower end wall department of plug sheath, the card limit buckle is in the lower end wall outside of plug sheath, the inside of third latch hook from the lower end wall outwards buckles in the rectangular through-hole locked groove, secondary latch set up in the upper end wall of plug sheath, fan-shaped sheath boss buckle is in the outside of low curb plate, the primary latch hook buckle of plug sheath once detains, accomplishes first step locking, secondary latch buckle is in the secondary locked groove, accomplishes the second step locking, presses the line the terminal sets up in the plug sheath, presses the line the plug portion of terminal passes through-hole, convex hole and first lockhole in proper order reaches in the second lockhole, the hanging point portion card of terminal is in terminal location elasticity couple department.

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

Preferably, the aperture of the second lock hole gradually contracts 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 protruding points, the outer side surface of the sealing gasket is provided with a plurality of concave points, and the protruding points are matched with the concave points.

Preferably, the two secondary locks are symmetrically arranged at two sides of the primary anti-lock, and the limiting stop lugs are positioned at the outer sides of the right sides of the hooks.

A method of installing a rectangular low voltage connector, comprising: the said

The first step: fitting the gasket smoothly face down into the lower end wall of the plug boot;

and a second step of: 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 outer side;

And a third step of: fitting a seal ring between the outer side wall and the upper end wall of the plug wrap;

Fourth step: the secondary locking piece is arranged in the upper end wall of the plug sheath, the fan-shaped sheath boss is sleeved on the outer side of the low side plate, the primary locking hook of the plug sheath is buckled with the primary anti-locking buckle to complete the first-step locking, and at the moment, the secondary locking buckle is positioned at the upper end of the low side plate;

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 passes 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;

Sixth step: 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 buckled on the low side plate to complete the locking and limiting.

The beneficial effects of adopting above technical scheme are:

① . The aperture of the secondary lock hole gradually contracts from bottom to top to form a circular truncated cone shape, so that the axial lead of the terminal is automatically on the same straight line with the axial lead of the secondary lock hole, and the semicircular baffle block is matched with the deep hole stroke of the secondary lock hole, so that the terminal can be blindly inserted into the low-voltage connector, no matter what the terminal is inserted into the low-voltage connector, the right-angle section of the joint of the hanging point part of the terminal and the line pressing part is not clamped with the positioning elastic hook, the positioning elastic hook can be always arranged at the hanging point part, and when the secondary lock catch of the secondary lock piece enters the secondary lock groove, forced installation is realized, so that the right-angle section of the terminal is crushed by the positioning elastic hook;

② . When the terminal is inserted and the secondary locking piece is pressed to reach the second-step locking state, the semicircular baffle block downwards presses the plug part of the terminal, so that hanging point parts of all the terminals can be automatically reset to the positioning elastic hooks, all the terminals can be automatically reset to the optimal positions, the pulling force of the terminals is enhanced, and the terminals are not easy to retract in normal use;

③ . The locking device of the primary lock hook, the primary reverse lock hook and the limiting stop lug on the secondary lock piece and the plug sheath, and the locking device of the secondary lock catch and the secondary lock groove can ensure that the secondary lock piece and the plug sheath are not easy to separate from each other in the equipment transportation process.

Drawings

FIG. 1 is a schematic diagram of the structure 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 plan view of the structure of the present invention;

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

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

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

FIG. 12 is a cross-sectional view taken along the direction C-C in FIG. 11;

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

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

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

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

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

Detailed Description

The following detailed description of the embodiments of the invention, given by way of example only, is presented in the accompanying drawings to aid in a more complete, accurate and thorough understanding of the concepts and aspects of the invention, and to aid in its practice, by those skilled in the art.

As shown in fig. 1 to 16, the present invention is a rectangular low voltage connector, comprising a plug sheath 1, a secondary lock 2, a seal ring 3, a gasket 4, a rear cover 5 and a plurality of terminals 6, 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 for the terminals 6 are arranged on the inserting ends of the first locking holes 11, the upper end wall 9 consists of a high side plate 13, a low side plate 14 and a primary locking hook 15, the low side plate 14 is positioned at four corners of the upper end wall 9, the primary locking hook 15 is positioned at the left waist center and the right waist center of the upper end wall 9, the high side plate 13 is positioned 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 rectangular through hole locking grooves 17 are formed in the waist position of the lower end wall 7;

the secondary lock 2 is provided with a plurality of second lock holes 18 corresponding to the first lock holes 11, semicircular stop blocks 19 are symmetrically arranged at the upper inserting ends of the second lock holes 18, fan-shaped sheath bosses 20 are arranged at four corners of the secondary lock 2, and primary anti-lock catches 21, limiting stop lugs 22 and two secondary lock catches 23 are symmetrically arranged at the left end and the right end of the secondary lock 2;

the rear cover 5 is provided with a plurality of through holes 24 corresponding to the first lock holes 11, the upper side and the lower side of the rear cover 5 are provided with clamping edges 25, the central positions of the waist parts of the left side and the right side 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 comprises a plug part 28, a hanging point part 29 and a wire 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 wire pressing part 30, the joint of the hanging point part 29 and the plug part 28 is a chamfer surface with a small angle, the front end of the hanging point part 29 is cylindrical, the middle part is in a round table shape, the rear end is cylindrical, the diameter of the front end and the rear end of the hanging point part 29 is equal to that of the upper surface and the lower surface of the middle part of the round table 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 wire pressing part 30 is provided with a right-angle section which can be 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 outside the lower end wall 7 of the plug sheath 1, the third lock hook 26 is buckled in the rectangular through hole locking groove 17 from the inner side of the lower end wall 7 to the outer side, the secondary lock 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 lock hook 15 of the plug sheath 1 is buckled in the primary reverse lock catch 21 to complete the first-step locking, the secondary lock catch 23 is buckled in the secondary locking groove 16 to complete the second-step locking, the terminal 6 with the wire pressed is arranged in the plug sheath 1, the plug head 28 of the terminal 6 with the wire pressed sequentially passes through the through hole 24, the convex hole 27 and the first lock hole 11 to reach the second lock hole 18, and the hanging point part 29 of the terminal 6 is buckled at the terminal 6 positioning elastic hook 12.

In this embodiment, the lower end wall 7 is integrally injection molded with the outer side wall 8 and the upper end wall 9, the outer side wall 8 surrounding the outside 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 shape, so that the inserted terminal 6 can be automatically reset, and the axis of the terminal 6 and the axis of the second locking hole 18 are on the same axis, so that the correction position is not needed.

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 pad 4 is provided with a plurality of concave points 32, and the protruding points 31 are matched with the concave points 32, so that the sealing pad 4 installed in the lower end wall 7 is given, and the axial leads of the through hole 24, the convex hole 27, the first lock hole 11 and the second lock hole 18 can be ensured to be on the same axial lead without the possibility of moving the sealing pad 4.

In this embodiment, the two secondary locks 23 are symmetrically disposed at two sides of the primary anti-lock 21, and the limit stop lugs 22 are located at the outer sides of the opposite sides of the hook.

Based on the above, the rectangular low-voltage connector with the structure has the beneficial effects that:

① . The aperture of the secondary lock hole gradually contracts from bottom to top to form a circular truncated cone shape, the axis of the terminal 6 is automatically on the same straight line with the axis of the secondary lock hole, the semicircular baffle block 19 is matched with the deep hole stroke of the secondary lock hole, the terminal 6 can be blindly inserted into the low-voltage connector, no matter what the terminal is inserted, the right-angle section of the joint of the hanging point part 29 of the terminal 6 and the line pressing part 30 is clamped with the positioning elastic hook 12, the positioning elastic hook 12 can be always clamped at the hanging point part 29, and the forced installation can not happen when the secondary lock catch 23 of the secondary lock 2 enters the secondary lock groove 16, so that the right-angle section of the terminal 6 is crushed by the positioning elastic hook 12;

② . When the terminal 6 is inserted and the secondary lock 2 is pressed to reach the second step locking state, the semicircular baffle block 19 can downwards press the plug part 28 of the terminal 6, so that the hanging point parts 29 of all the terminals 6 can be automatically reset to 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 retract in normal use;

③ . The locking device of the primary lock hook 15 and the primary reverse lock hook and the limit stop lug 22 on the secondary lock 2 and the plug sheath 1, and the locking device of the secondary lock catch 23 and the secondary lock groove 16 can ensure that the secondary lock 2 and the plug sheath 1 are not easy to separate from each other in the equipment transportation process.

The following describes specific modes of operation with specific examples:

Example 1:

The first step: the gasket 4 is fitted smoothly face down into the lower end wall 7 of the plug wrap 1;

And a second step of: the rear cover 5 is buckled on the lower end wall 7 of the plug sheath 1, the clamping edge 25 of the rear cover 5 can be clamped on the lower end wall 7, when the rear cover 5 is pressed downwards to be installed, the limit is ensured when the rear cover 5 is pressed downwards, and the third lock hook 26 on the rear cover 5 is clamped in the rectangular through hole lock groove 17 from the inner side of the lower end wall 7 outwards, so that the rear cover 5 is stably installed;

and a third step of: fitting the sealing ring 3 between the outer side wall 8 and the upper end wall 9 of the plug wrap 1;

Fourth step: as shown in fig. 3 and 6-7, the secondary lock 2 is firstly installed in the upper end wall 9 of the plug sheath 1 along the high side plate 13, the lower part of the fan-shaped sheath boss 20 is sleeved on the outer side of the low side plate 14, at the moment, the primary lock hook 15 of the plug sheath 1 is blocked by the limit stop lug 22 to buckle the primary anti-lock catch 21, the first-step locking is completed, and at the moment, the secondary lock catch 23 is positioned at the upper end of the low side plate 14 and does not enter the secondary lock groove 16;

Fifth step: as shown in fig. 4, 6-10, the terminal 6 with the wire being pressed is inserted into the rectangular low-voltage connector, the plug portion 28 of the terminal 6 with the wire being pressed sequentially passes through the through hole 24, the convex hole 27 and the first lock hole 11 to reach the second lock 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 a distance is left between the upper end surface of the plug portion 28 of the terminal 6 and the semicircular stop 19 of the second lock hole 18;

If the inserted terminal 6 is located at the worst position, the upper end surface of the plug portion 28 of the terminal 6 will be supported by the semicircular stop 19, the hanging point portion 29 of the terminal 6 will exceed the positioning elastic hook 12, and when the terminal 6 is in the first step locking state, the stroke height of the second lock hole 18 of the secondary lock member 2 will ensure that even if the terminal 6 is located at the worst position during insertion, the right-angle section of the terminal 6 will not be blocked by the positioning elastic hook 12, and the damage of the positioning elastic hook 12 caused by forced downward resetting of the right-angle section will not occur, so that the positioning elastic hook 12 can be always located between the hanging point portion 29, the hanging point portion 29 and the right-angle section.

Sixth step: the secondary locking piece 2 is pressed downwards, the secondary lock catch 23 is clamped into the secondary locking groove 16, the second-step locking is completed, the fan-shaped sheath boss 20 is completely seated on the low side plate 14, the installation stability of the secondary locking piece 2 can be guaranteed, meanwhile, the freedom degree of the secondary locking piece 2 in the up-down direction can be controlled, in the process of pressing the secondary locking piece 2 downwards, if the terminal 6 is located at the optimal position, the semicircular baffle block 19 on the second lock hole 18 can be attached to the upper end face of the plug part 28 of the terminal 6 finally, if the terminal 6 is located at the worst state, the semicircular baffle block 19 can be pressed against the terminal 6 to move downwards to the optimal position together, so that the freedom degree of the terminal 6 up-down is completely eradicated, and all the positioning elastic hooks 12 are clamped at the hanging point parts 29 of the terminal 6.

Example 2:

If the terminal 6 is damaged, when maintenance is needed, the secondary lock catch 23 can be pulled out of the secondary lock groove 16 conveniently by force on the fan-shaped sheath boss 20, the secondary lock 2 is pulled out slowly to the first-step locking state, the limit stop lug 22 is gently pried, the primary lock hook 15 can be separated from the primary reverse lock hook, so that the secondary lock 2 is taken out of the upper end wall 9 of the plug sheath 1, the positioning elastic hook 12 of the terminal 6 to be replaced is lifted out by the fine iron rod, then the terminal 6 is taken out slowly from the whole connector by the pull wire, the secondary lock 2 is firstly tested again to be installed in the first-step locking state, if other good terminals 6 can be smoothly inserted into the corresponding second lock holes 18, the other good terminals 6 cannot be smoothly inserted into the corresponding second lock holes 18, all the terminals 6 are required to be removed after repeated attempts, the secondary lock 2 is installed in the first-step locking state, the terminal 6 is reinserted again, and finally the second-step lock 2 is pressed into the second-step locking state, and maintenance is completed.

While the invention has been described above by way of example with reference to the accompanying drawings, it is to be understood that the invention is not limited to the particular embodiments described, but is capable of numerous insubstantial modifications of the inventive concept and solution; or the invention is not improved, and the conception and the technical scheme are directly applied to other occasions and are all within the protection scope of the invention.

Claims (4)

1. The utility model provides a rectangle low voltage connector, includes plug sheath (1), secondary latch (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 lock plate (10) is arranged inside the plug sheath (1), a plurality of first lock holes (11) are formed in the terminal lock plate (10), a plurality of positioning elastic hooks of terminals (6) are arranged at the inserting-out ends of the first lock holes (11), the upper end wall (9) consists of a high side plate (13), a low side plate (14) and a primary lock hook (15), the low side plate (14) is positioned at four corners of the upper end wall (9), the primary lock hook (15) is positioned at the center position of the left waist and the right waist of the upper end wall (9), gao Ceban (13) are positioned at the upper side position and the lower side of the upper end wall (9), secondary lock grooves (16) are formed in the inner wall of the low side plate (14), and rectangular through hole lock grooves (17) are 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 stop blocks (19) are symmetrically arranged at the upper inserting ends of the second lock holes (18), fan-shaped sheath bosses (20) are arranged at four corners of the secondary lock piece (2), and primary anti-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);

the rear cover (5) is provided with a plurality of through holes (24) corresponding to the first lock holes (11), clamping edges (25) are arranged on the upper side and the lower side of the rear cover (5), the center positions of the waist parts of the left side and the right side 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) comprises a plug part (28), a hanging point part (29) and a wire 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 wire pressing part (30), and a right-angle section is arranged at the joint of the hanging point part (29) and the wire pressing part (30) and can be 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) outwards, 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 with the primary anti-lock catch (21) to complete the first step of locking, the secondary locking catch (23) is buckled in the secondary locking groove (16) to complete the second step of locking, the terminal (6) with the pressed wire is arranged in the plug sheath (1), the terminal (6) with the pressed wire penetrates through the second through hole (24) and the convex hole (18) of the plug (18) in sequence, the hanging point part (29) of the terminal (6) is clamped at the positioning elastic hook (12) of the terminal (6); 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); the aperture of the second lock hole (18) gradually contracts from bottom to top to form a round table shape.

2. A rectangular low voltage connector according to claim 1, wherein: 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), and the protruding points (31) are matched with the concave points (32).

3. A rectangular low voltage connector according to claim 1, wherein: the two secondary locks (23) are symmetrically arranged on two sides of the primary anti-lock catch (21), and the limiting stop lugs (22) are positioned on the outer sides of the right opposite sides of the hooks.

4. A method of installing a rectangular low voltage connector according to claim 1, wherein:

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

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

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

Fourth step: the secondary lock (2) is arranged in the upper end wall (9) of the plug sheath (1), the fan-shaped sheath boss (20) is sleeved on the outer side of the low side plate (14), the primary lock hook (15) of the plug sheath (1) is buckled with the primary anti-lock catch (21), the first-step locking is completed, and at the moment, the secondary lock catch (23) is positioned at the upper end of the low side plate (14);

Fifth step: the terminal (6) with the wire pressed is arranged in the plug sheath (1), a plug part (28) of the terminal (6) with the wire pressed sequentially passes 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 positioning elastic hook (12) of the terminal (6);

Sixth step: 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 buckled on the low side plate (14) to complete the locking and limiting.