CN105639880A - Using method of double-layer closed zipper - Google Patents

Abstract

The use method of the double-layer closed zipper comprises a zipper seat, an upper zipper, a lower zipper and a steel tape, wherein the zipper seat is provided with a left upper zipper groove, a right upper zipper groove, a left lower zipper groove and a right lower zipper groove; the left upper chain is provided with a left upper chain buckle, a left anti-inserting piece and a left upper chain cloth, and the right upper chain is provided with a right upper chain buckle, a right anti-inserting piece and a right upper chain cloth; during the use, seal the zip fastener with the bilayer and set up on the suitcase, the bilayer seals the zip fastener and is equipped with two-layer chain and steel tape, and the chain is equipped with left side and prevents the inserted sheet and prevent the inserted sheet right, utilizes the left side to prevent the inserted sheet and prevent the inserted sheet seal the left side and prevent the clearance between the upper chain knot and the upper chain knot of right side, utilizes the steel tape winding of steel tape to seal two-layer chain, increases the degree of difficulty that lawless persons inserted the zip fastener with the sharp weapon.

Description

How to use the double-layer closure zipper

technical field

The invention relates to a method for using a safety zipper, in particular to a method for using a double-layer closed zipper.

Background technique

At present, the zippers used in suitcases or luggage bags are not strong enough. In the process of use, criminals can use a sharp tool to insert the zipper, and the zipper can be cut open. A double-layer closed zipper that prevents the zipper from being cut. The method of use has become a need to improve the strength of the zipper and prevent theft.

Contents of the invention

The purpose of the present invention is to overcome the deficiencies of the prior art, and provide a method for using a double-layer closed slide fastener, which is used to increase the strength of the slide fastener and improve the anti-theft performance of the slide fastener.

The technical solution adopted in the present invention is: the double-layer closed zipper includes a chain seat, an upper chain, a lower chain and a steel tape, and the chain seat is connected with the upper chain, the lower chain and the steel tape; the chain seat is provided with a left upper chain groove and a right upper chain slot, lower left chain slot and lower right chain slot, the upper chain includes upper left chain, upper right chain, chain head sealer and chain tail sealer, the lower chain includes lower left chain and lower right chain; upper left chain, upper right chain, lower left chain And the lower right chain is connected with the chain head sealing piece and the chain tail sealing piece; the upper left chain is connected with the upper left chain slot, the upper right chain is connected with the upper right chain slot 6, the lower left chain is connected with the lower left chain slot, and the lower right chain is connected with the lower right chain slot The steel tape measure includes a shell and a steel coil, the head end of the steel coil is connected with the chain head seal of the upper chain, the steel coil is connected with the upper left chain and the upper right chain in a moving fit, and the steel coil is located above the chain seat; the upper left The chain is equipped with a left upper chain buckle, a left anti-insertion piece and a left upper chain cloth, and the left upper chain buckle and the left anti-insertion piece are made of an integral material, and the left upper chain buckle is connected with the left upper chain cloth; the right upper chain is provided with a right upper chain buckle, a right anti-insertion and the right upper chain cloth, the right upper chain buckle and the right anti-insertion piece are made of one piece of material, the right upper chain buckle and the right upper chain cloth are connected; the left anti-insertion piece is located between each left upper chain buckle, and the right anti-insertion piece is located Use the left anti-insertion piece and the right anti-insertion piece to seal the gap between the left upper chain buckle and the right upper chain buckle, so as to increase the difficulty for criminals to insert the upper chain; When chaining and lowering the chain, the sharp weapon is blocked by the steel coil belt, making it difficult for criminals to insert the upper chain and the lower chain.

The method of using the double-layer closed zipper is: when in use, connect the left upper chain cloth, right upper chain cloth, right lower chain cloth and left lower chain cloth with the mouth of the suitcase, and make the handle on the steel tape measure outside the suitcase; When using the suitcase, grab the handle to pull the steel tape and the chain seat to move, and the chain seat moves with the handle, so that the upper left chain and the upper right chain are snapped together, and the lower left chain is snapped together with the lower right chain, and the suitcase is locked. At the same time, the steel tape moves with the chain seat, and the steel tape is pulled out with the movement of the steel tape. The pulled steel tape is buckled on the chain seat by the left upper chain buckle of the left upper chain and the right upper chain buckle of the right upper chain. seal the top of the upper left chain and the upper right chain; when the upper left chain and the upper right chain are closed, the left anti-insertion piece moves to the position between one left upper chain buckle and the other left upper chain buckle, and the right anti-insertion move the piece to the position between one upper right chain link and the other upper right chain link, use the left anti-insertion piece to block the gap between one left upper chain link and the other left upper chain The gap between the other upper right chain buckles increases the difficulty for criminals to use sharp tools to insert the zipper; when opening the suitcase mouth, use the hand to pull the chain seat through the handle to move in the opposite direction, and the chain seat moves with the handle to make the closed upper left The chain is separated from the upper right chain, and the lower left chain is separated from the lower right chain; at the same time, the steel coil belt moves in the opposite direction with the chain seat, and the steel coil belt is retracted in the steel tape measure under the elastic force of the torsion spring of the steel tape measure.

The beneficial effects of the present invention are: when in use, the double-layer closed zipper is arranged on the suitcase, the double-layer closed zipper is provided with two layers of chains and a steel tape measure, the upper chain is provided with a left anti-insertion piece and a right anti-insertion piece, and the left and right anti-insertion pieces are used. The anti-insertion piece and the right anti-insertion piece seal the gap between the left upper chain buckle and the right upper chain buckle, and use the steel tape of the steel tape to seal the two-layer chain. When criminals use sharp objects to insert into the chain, the sharp objects are blocked by the steel tape , Increase the difficulty of criminals inserting the zipper with a sharp weapon.

Description of drawings

Fig. 1 is the structural representation of double-layer closed slide fastener;

Fig. 2 is a partial schematic view of the left anti-insertion piece and the right anti-insertion piece;

Fig. 3 is the left view of Fig. 1;

FIG. 4 is a top view of FIG. 3 .

detailed description

Below in conjunction with accompanying drawing, the present invention is further described:

The structural schematic diagram of the double-layer closed zipper shown in Fig. 1, the partial schematic diagram of the left anti-insertion piece and the right anti-insertion piece shown in Fig. 2, the left view of Fig. 1 shown in Fig. 3 and the top view of 3 shown in Fig. 4; double-layer The closed zipper includes a chain base 1, an upper chain 2, a lower chain 3 and a steel tape 4, the chain base 1 is connected with the upper chain 2, the lower chain 3 and the steel tape 4; the chain base 1 is provided with a left upper chain slot 5 and a right upper chain slot 6. The lower left chain slot 7 and the lower right chain slot 8, the upper chain 2 includes the upper left chain 9, the upper right chain 10, the chain head sealer 11 and the chain tail sealer 12, the lower chain 3 includes the lower left chain 13 and the lower right chain 14; The upper left chain 9, the upper right chain 10, the lower left chain 13 and the lower right chain 14 are connected with the chain head seal 11 and the chain tail seal 12; the upper left chain 9 is connected with the upper left chain groove 5, and the upper right chain 10 is connected with the upper right chain groove 6 Connect, the lower left chain 13 is connected with the lower left chain groove 7, and the lower right chain 14 is connected with the lower right chain groove 8; The chain head sealing part 11 is connected, and the steel coil belt 16 is connected with the upper left chain 9 and the upper right chain 10. The steel coil belt 16 is positioned at the top of the chain seat 1; The left upper chain cloth 20, the left upper chain buckle 18 and the left anti-insertion piece 19 are made of an integral material, the left upper chain buckle 18 is connected with the left upper chain cloth 20; the right upper chain 10 is provided with the right upper chain buckle 21, the right anti-insertion piece 22 and the right upper chain Cloth 23, upper right chain buckle 21 and right anti-insertion piece 22 are made of integral material, right upper chain buckle 21 is connected with right upper chain cloth 23; The sheet 22 is located between each upper right chain buckle 21, and the left anti-insertion piece 19 and the right anti-insertion piece 22 are used to seal the gap between the left upper chain buckle 18 and the upper right chain buckle 21, so that criminals can insert the upper chain 2 When criminals insert upper chain 2 and lower chain 3 with sharp weapon, sharp weapon is blocked by steel coil belt 16, make criminals be difficult to insert upper chain 2 and lower chain 3.

In order to implement the steel tape 16 of the steel tape measure 4 to seal the closing openings of the upper chain 2 and the lower chain 3, and keep the closing and separating functions of the chain 2 and the chain 3, the left upper chain buckle 18 is provided with a left hook 26, and the right upper chain Buckle 21 is provided with right hook 29; Left lower chain 13 is provided with left lower chain buckle 24 and left lower chain cloth 25, and left lower chain buckle 24 is connected with left lower chain cloth 25; Right lower chain 14 is provided with right lower chain buckle 27 and right lower chain Cloth 28, right lower chain button 27 is connected with right lower chain cloth 28; Left lower chain cloth 25 and right lower chain cloth 28 are connected with left upper chain cloth 20 and right upper chain cloth 23, left lower chain cloth 25, right lower chain cloth 28, left The chain cloth 20 and the upper right chain cloth 23 are connected with the chain head sealing part 11 and the chain tail sealing part 12; the steel coil belt 16 is connected with the left upper chain buckle 18 and the right upper chain buckle 21 in moving fit, and the steel coil belt 16 is located at the left hook 26 and the upper right chain buckle 21. Between the right hooks 29, the left hook 26 and the right hook 29 are located above the left upper chain slot 5 and the right upper chain slot 6, and the left hook 26 and the right hook 29 are used to hook the steel coil belt 16; the chain base 1 includes There are upper chain plate 30, upper chain column 31, middle chain plate 32, lower chain column 33 and lower chain plate 34, upper chain plate 30 is connected with upper chain column 31, upper chain column 31 is connected with middle chain plate 32 Connect, the middle chain plate 32 is connected with the lower joint chain post 33, and the lower joint chain post 33 is connected with the lower chain plate 34; or, the upper chain plate 30, the upper joint chain post 31, the middle chain plate 32, the lower joint chain post 33 and The lower chain plate 34 is made of an integral material; the upper chain plate 30 is provided with a guide wheel 43, and the steel coil belt 16 is connected with the chain head sealing member 11 through the guide wheel 43; the shell 15 of the steel tape measure 4 is connected with the upper chain plate 30; The chain slot 5 is composed of the upper chain plate 30, the middle chain plate 32 and the left side of the upper chain column 31. The left upper chain slot 5 is located on the left side of the upper chain column 31; the right upper chain slot 6 is composed of the upper chain plate 30 and the middle chain plate 32. It is formed with the right side of the upper chain column 31, and the right chain groove 6 is located on the right side of the upper chain column 31; the left lower chain groove 7 is formed by the middle chain plate 32, the lower chain plate 34 and the left side of the lower chain column 33, and the left lower chain groove 7 is positioned at the left side of closing chain column 33; Right lower chain groove 8 is formed by the right left side of middle chain plate 32 and lower chain plate 34 and lower closing chain column 33, and right lower chain groove 8 is positioned at the right side of lower closing chain column 33.

In order to make the steel coil belt 16 and the upper chain plate 30 move between the left crotch 26 and the right crotch 29, the distance between the left crotch 26 and the right crotch 29 is greater than the width of the steel coil belt 16, so that the steel coil Belt 16 can move between left crotch 26 and right crotch 29; Move between the right hooks 29; the distance from the left hook tail 35 of the left hook 26 to the right hook tail 36 of the right hook 29 is less than the width of the steel coil band 16; the steel coil band 16 is located between the upper chain plate 30 and the left hook tail 35 and the right hook tail 36; Make steel coil band 16 can not break away from left crotch 26 and right crotch 29.

In order to implement the dynamic fit connection between the left upper chain link 18 and the right upper chain link 21, the left gap 37 between one left upper chain link 18 and another left upper chain link 18 is 0.2 mm to 0.5 mm larger than the width of the left anti-insertion piece 19; The right gap 38 between the right upper chain buckle 21 and another right upper chain buckle 21 is 0.2 mm to 0.5 mm larger than the width of the right anti-insertion sheet 22; the width of the left upper chain buckle 18 is equal to the width of the right upper chain buckle 21; The width of sheet 19 is equated with the width of right anti-insertion sheet 22;

In order to lock the chain base 1 with a lock, it is characterized in that: the steel tape measure 4 is provided with a dynamic lock hole 39, and the chain tail sealing member 12 is provided with a fixed lock hole 41, so that the chain base 1 and the chain tail can be sealed with a lock conveniently. The pieces 12 are locked together.

The using method of the double-layer closed zipper is: when in use, the left upper chain cloth 20, the right upper chain cloth 23, the right lower chain cloth 28 and the left lower chain cloth 25 are connected with the mouth of the suitcase, and the handle 40 on the steel tape measure 4 Located outside the suitcase; when the suitcase is closed, grab the handle 40 to pull the steel tape measure 4 and the chain seat 1 to move, and the chain seat 1 moves with the handle 40, so that the left upper chain 9 and the right upper chain 10 are snapped together, and the left lower chain 13 and the lower right chain 14 snap together to close the mouth of the suitcase; at the same time, the steel tape 4 moves along with the chain seat 1, and the steel coil belt 16 is pulled out along with the steel tape 4 moving, and the pulled steel coil The belt 16 is buckled on the top of the chain seat 1 by the upper left chain buckle 18 of the upper left chain 9 and the upper right chain buckle 21 of the upper right chain 10, and seals the closing opening of the upper left chain 9 and the upper right chain 10; the upper left chain 9 and the upper right chain 10 When closing, the left anti-insertion piece 19 moves to a position between one left upper chain link 18 and another left upper chain link 18, and the right anti-insertion piece 22 moves to a position between one right upper chain link 21 and another right upper chain link 21. Use the left anti-insertion piece 19 to block the gap between one left upper chain link 18 and the other left upper chain link 18, and use the right anti-insertion piece 22 to block the gap between one right upper chain link 21 and the other right upper chain link 21 , to increase the difficulty for lawbreakers to use sharp tools to insert the zipper; when opening the mouth of the suitcase, pull the chain seat 1 through the handle 40 to move in the opposite direction, and the chain seat 1 moves with the handle 40, so that the closed upper left chain 9 and the upper right chain 10 separates, and makes left lower chain 13 separate with right lower chain 14; Simultaneously, steel coil band 16 moves in the opposite direction with chain seat 1, and steel coil band 16 is retracted in the steel tape measure 4 under the elastic force of steel tape measure 4 torsion springs.

When the anti-insertion zipper is used to close the suitcase, the handle 40 pulls the shell 15 and the chain seat 1 to move, the left upper chain buckle 18 and the left anti-insertion piece 19 are introduced from the left upper chain groove 5, and the right upper chain buckle 21 and the right anti-insertion piece 22 is introduced from the upper right chain groove 6, the lower left chain link 24 is introduced from the lower left chain groove 7, and the lower right chain link 27 is introduced from the lower right chain groove 8. The upper left chain link 5 and the upper right chain groove 6 of the chain base 1 are used to make the upper left chain 18 is engaged with the upper right chain link 21, and the lower left chain link 24 is engaged with the lower right link link 27 by using the lower left chain slot 7 and the lower right chain slot 8; at the same time, the left anti-insertion piece 19 moves to an upper left side following the upper left chain link 18. The position of the left gap 37 between the chain buckle 18 and the other upper left chain buckle 18; position; at the same time, the steel tape 4 moves with the chain base 1, and the steel tape 16 is pulled out along with the steel tape 4 moving, and the pulled steel tape 16 is pulled out by the left hook tail 35 of the left hook 26 and the right hook 29 The right hook tail 36 is fastened in the left crotch 26 and the right crotch 29, and the steel coil belt 16 pulled out is located between the upper chain plate 30, the left hook tail 35 and the right hook tail 36.

When the left upper chain buckle 18 and the right upper chain buckle 21 are snapped together, the distance between the left hook tail 35 of the left hook 26 and the right hook tail 36 of the right hook 29 is less than the width of the steel coil strip 16, so that the steel coil The belt 16 is buckled in the left hook 26 and the right hook 29 to prevent the steel coil belt 16 from breaking away from the left hook 26 and the right hook 29 .

When the upper left chain 9 and the upper right chain 10 are snapped together, the steel tape measure 4 moves with the chain seat 1, the upper chain plate 30 moves between the left hook 26 and the right hook 29 with the handle 40, and the steel tape 16 The length drawn out is proportional to or equal to the closed length of the upper left chain 9 and the upper right chain 10; when the upper left chain 9 and the upper right chain 10 are separated, the steel tape measure 4 follows the chain base 1 and moves in the opposite direction, and the upper chain plate 30 follows the handle 40 Moving between the left crotch 26 and the right crotch 29, the length of the steel tape 16 recovered in the steel tape measure 4 is directly proportional to or equal to the length of the upper left chain 9 separated from the upper right chain 10.

When the upper left chain 9 and the upper right chain 10 are closed, the length of the steel tape 16 that the steel tape 4 is pulled out is greater than the length of the steel tape 16 that the steel tape 4 is pulled out when the upper left chain 9 and the upper right chain 10 are separated; When the upper chain 2 and the lower chain 3 are closed, the chain base 1 moves towards the chain tail sealing member 12, and the upper chain 2 and the lower chain 3 are continuously closed with the movement of the chain base 1; when the upper chain 2 and the lower chain 3 are separated , the chain seat 1 moves towards the chain head sealing member 11, and the upper chain 2 and the lower chain 3 are continuously separated with the movement of the chain seat 1; Each right anti-insertion piece 22 is connected with the adjacent right upper chain buckle 21 with a dynamic fit.

In order to reduce the frictional force of steel coil belt 16 movement, described guide wheel 43 is provided with hinge shaft 42, and upper chain plate 30 is provided with hinged hole 44, and the hinge shaft 42 of guide wheel 43 is hinged with the hinged hole 44 of upper chain plate 30 When the steel coil band 16 was pulled out by the steel tape measure 4, the steel coil band 16 pushed down the guide wheel 43, and the steel coil band 16 drove the guide wheel 43 to rotate, reducing the frictional force between the steel coil band 16 and the guide wheel 43; When 16 was withdrawn by steel tape measure 4, steel coil band 16 pushed down guide wheel 43, and steel coil band 16 drives guide wheel 43 to rotate, reduces the frictional force of steel coil band 16 and guide wheel 43.

Claims (9)

1. How to use the double-layer closed zipper. The double-layer closed zipper includes a chain base (1), an upper chain (2), a lower chain (3) and a steel tape measure (4). The chain base (1) has an upper left chain slot (5), right upper chain slot (6), left lower chain slot (7) and right lower chain slot (8), upper chain (2) includes left upper chain (9), right upper chain (10), chain head sealing piece ( 11) and the chain tail sealing piece (12), the lower chain (3) includes the lower left chain (13) and the lower right chain (14); the steel tape measure (4) includes the shell (15) and the steel coil belt (16), The left upper chain (9) is provided with the left upper chain buckle (18), the left anti-insertion piece (19) and the left upper chain cloth (20), and the right upper chain (10) is provided with the right upper chain buckle (21), the right anti-insertion piece (22) And upper right chain cloth (23), upper left chain buckle (18) is provided with left crotch (26), and upper right chain buckle (21) is provided with right crotch (29); Left lower chain (13) is provided with left lower crotch (24) ) and the lower left chain cloth (25), the lower right chain (14) is provided with the lower right chain buckle (27) and the lower right chain cloth (28), and the upper chain plate (30) is provided with a guide wheel (43); it is characterized in that : The using method of the double-layer closed zipper is: during use, connect the upper left chain cloth (20), the upper right chain cloth (23), the lower right chain cloth (28) and the lower left chain cloth (25) with the box of the suitcase and the handle (40) on the steel tape (4) is located outside the trunk; when the trunk is closed, the handle (40) pulls the steel tape (4) and the chain seat (1) to move, and the chain seat (1 ) moves with the handle (40), so that the left upper chain (9) and the right upper chain (10) snap together, and the left lower chain (13) and the right lower chain (14) snap together, and the trunk The box mouth is closed; at the same time, the steel tape (4) moves with the chain base (1), and the steel coil (16) is pulled out along with the steel tape (4), and the pulled steel tape (16) is pulled out by the upper left chain ( 9) the upper left chain buckle (18) and the upper right chain buckle (21) of the upper right chain (10) are buckled on the top of the chain seat (1), and the upper left chain (9) and the upper right chain (10) are sealed above the closing mouth ;When the left upper chain (9) and the right upper chain (10) are closed, the left anti-insertion piece (19) moves to the position between one left upper chain link (18) and the other left upper chain link (18), and the right anti-insertion The piece (22) moves to the position between one upper right chain link (21) and the other upper right chain link (21), and the left anti-insertion piece (19) is used to block one left upper chain link (18) and the other left upper chain link ( 18), use the right anti-insertion piece (22) to block the gap between one upper right chain buckle (21) and the other upper right chain buckle (21), so as to increase the difficulty for criminals to use sharp tools to open the zipper; open luggage When opening the box, use the handle (40) to pull the chain seat (1) to move in the opposite direction, and the chain seat (1) moves with the handle (40), so that the closed upper left chain (9) is separated from the upper right chain (10) , and make the lower left chain (13) and the lower right chain (14) separate Open; Simultaneously, the steel coil band (16) moves in the opposite direction with the chain seat (1), and the steel coil band (16) retracts in the steel tape measure (4) under the elastic force of the steel tape measure (4) torsion spring. 2. The method of using the double-layer closed zipper according to claim 1, characterized in that: when the anti-insertion zipper closes the suitcase, the handle (40) pulls the shell (15) and the chain seat (1) to move , the left upper chain link (18) and the left anti-slip (19) are introduced from the left upper chain slot (5), the right upper chain link (21) and the right anti-slip (22) are introduced from the right upper chain slot (6), and the left lower chain (24) is introduced from the lower left chain slot (7), and the lower right chain link (27) is introduced from the lower right chain slot (8). The upper left chain link (18) is engaged with the upper right chain link (21), and the lower left chain link (24) is engaged with the lower right chain link (27) by using the lower left chain slot (7) and the lower right chain slot (8); at the same time , the left anti-insertion piece (19) follows the left upper chain link (18) and moves to the position of the left gap (37) between one left upper chain link (18) and the other left upper chain link (18); the right anti-insertion plate (22 ) follows the upper right chain link (21) to the position of the right gap (38) between one upper right chain link (21) and the other upper right chain link (21); at the same time, the steel tape measure (4) follows the chain seat (1) Move, the steel coil band (16) is pulled out along with the steel tape measure (4) moves, and the steel coil band (16) of pulling out is by the left hook tail (35) of the left hook (26) and the right hook (29) The right hook tail (36) is buckled in the left hook (26) and the right hook (29), and the steel coil belt (16) is pulled out and is located on the upper chain plate (30) and the left hook tail (35) and the right hook Between the tail (36). 3. The method of using the double-layer closed zipper according to claim 2, characterized in that: when the left upper link (18) and the right upper link (21) are snapped together, the left hook (26) The distance between the left hook tail (35) and the right hook tail (36) of the right hook (29) is less than the width of the steel coil band (16), so that the steel coil band (16) is buckled between the left hook (26) and the right hook In the crotch (29), to avoid the steel coil band (16) from the left crotch (26) and the right crotch (29). 4. The method of using the double-layer closed zipper according to claim 1, characterized in that: when the upper left chain (9) and the upper right chain (10) are snapped together, the steel tape measure (4) follows the chain seat (1) Move, the upper chain plate (30) follows the handle (40) and moves between the left hook (26) and the right hook (29), and the drawn length of the steel coil belt (16) is the same as that of the left upper chain (9 ) is proportional to or equal to the closed length of the upper right chain (10); when the upper left chain (9) is separated from the upper right chain (10), the steel tape measure (4) moves in the opposite direction with the chain seat (1), and the upper chain plate (30) Follow the handle (40) to move between the left hook (26) and the right hook (29). ) are proportional to or equal to the length of separation. 5. The method of using the double-layer closed zipper according to claim 1, characterized in that: the steel tape (4) is pulled out when the left upper chain (9) and the right upper chain (10) are closed ( 16) length is greater than the steel tape (16) length that steel tape measure (4) is pulled out when left upper chain (9) and right upper chain (10) separate. 6. The method of using the double-layer closed zipper according to claim 1, characterized in that: when the upper chain (2) and the lower chain (3) are closed, the chain seat (1) faces the chain tail seal (12) ) direction, the upper chain (2) and the lower chain (3) are continuously closed with the movement of the chain base (1); when the upper chain (2) and the lower chain (3) are separated, the chain base (1) moves toward the chain The head seal (11) moves in the direction, and the upper chain (2) and the lower chain (3) are continuously separated along with the movement of the chain seat (1). 7. The method of using double-layer closed zipper according to claim 1, characterized in that: each of the left anti-insertion pieces (19) is connected with the adjacent left upper chain buckle (18) in a moving fit, and each right The anti-insertion piece (22) is dynamically fitted with the adjacent upper right chain buckle (21). 8. The method of using double-layer closed zipper according to claim 1, characterized in that: the guide wheel (43) is provided with a hinge shaft (42), and the upper chain plate (30) is provided with a hinge hole (44) , the hinge shaft (42) of the guide wheel (43) is hinged with the hinge hole (44) of the upper chain plate (30). 9. The method of using the double-layer closed zipper according to claim 8, characterized in that: when the steel coil (16) is pulled out by the steel tape (4), the steel coil (16) presses the guide Wheel (43), steel coil belt (16) drives guide wheel (43) to rotate, reduces the frictional force of steel coil belt (16) and guide wheel (43); When steel coil belt (16) is withdrawn by steel tape measure (4) , steel coil band (16) pushes down guide wheel (43), and steel coil band (16) drives guide wheel (43) to rotate, reduces the frictional force of steel coil band (16) and guide wheel (43).