CN109747970B - Bulk single-head self-locking nylon cable tie for machine and mold ejection method thereof - Google Patents

Abstract

The invention provides a bulk single-head self-locking nylon cable tie for a machine and a mould ejection method thereof, wherein the bulk single-head self-locking nylon cable tie comprises a cable tie head, a cable tie body and a cable tie tail, the cable tie head is in a rectangular table shape, the upper bottom surface and the lower bottom surface of the cable tie head are designed into parallel surfaces, the center of the cable tie head is provided with 1 through hole vertical to the upper bottom surface and the lower bottom surface, the inner wall of the through hole is provided with a cantilever, the cantilever has certain elasticity, the cantilever is provided with 1-3 lock catch ratchets, and each lock catch ratchet is triangular; the ribbon head sets up the ribbon runner of width more than 2.0mm, guarantees the ribbon runner with the ribbon head has sufficient joint strength, and the thimble setting has avoided the ribbon head the excessive ejection of compact of thimble to appear on the sprue, adopts the automatic excision ribbon runner of cutting die, a face of ribbon area body with the parallel and alignment of great that bottom surface of the ribbon head of rectangular platform shape, the ribbon afterbody are the parallel extension section on the ribbon area body length direction, and the ribbon afterbody is 180 degrees with the contained angle of ribbon area body.

Description

Bulk single-head self-locking nylon cable tie for machine and mold ejection method thereof

Technical Field

The invention relates to the field of nylon cable ties, in particular to a bulk single-head self-locking nylon cable tie for a machine and a mold ejection method thereof.

Background

Traditionally, bulk single-headed self-locking nylon ties have been punched manually, tensioned and cut manually or with a tool, and there are many products such as: the nylon cable ties are used in large quantities by wiring harnesses, household appliances and the like, in many occasions, more than 6000 cable ties need to be bound by a worker manually every day, and considering that the cable ties are bent directionally (according to the statistical data of hectometrics and overseas websites, the annual sales volume of the cable ties in 2018 in the world is about 75-80 million yuan, about 5000 million cable ties are combined, wherein the proportion of bulk single-head self-locking nylon cable ties accounts for more than 50% of the whole nylon cable ties), in order to avoid the bending direction error of the manual cable tie operation of the worker at high frequency, all main cable tie manufacturers in the world make the tail of the nylon cable tie into a certain angle (generally about 20 degrees) for warping, the warping direction of the tail of the cable tie is consistent with the direction needing to be bent, and the warping of the tail of the cable tie can help the worker to more conveniently penetrate the tail of the bulk nylon cable tie into a hole in the head of the cable tie, but the tail convenient to manually operated design is not suitable for an automatic cable tie tool or an automatic cable tie device, and the warping tail easily causes the automatic perforation failure; in addition, the traditional self-locking nylon cable tie adopts an injection molding process, the locking buckle at the head of the self-locking nylon cable tie forms an inverted buckle after injection molding, and therefore an ejector pin needs to be arranged on the bottom end face of the head of the cable tie, the ejector pin works at high frequency and is easy to wear, so that burrs and cloaks are easy to appear on the bottom end face of the head of the bulk single-head self-locking nylon cable tie.

Disclosure of Invention

The invention aims to solve the technical problem that the traditional bulk single-head nylon cable tie cannot meet the requirements of automatic cable tie equipment or automatic cable tie tools, and provides a bulk single-head self-locking nylon cable tie for a machine and a mold ejection method thereof based on the requirements of the automatic cable tie equipment or the automatic cable tie tools and by combining the injection molding process and the mold structure characteristics of the nylon cable tie.

The invention provides a bulk single-head self-locking nylon cable tie for a machine and a mold ejection method thereof.

Furthermore, the head of the ribbon is in a rectangular table shape, which is different from a traditional ribbon, the upper bottom surface and the lower bottom surface of the head of the ribbon are designed to be parallel or not parallel, the head of the ribbon is generally designed with a mold slope, namely, the areas of the upper bottom surface and the lower bottom surface of the head of the ribbon are different, the center of the head of the ribbon is provided with 1 through hole vertical to the upper bottom surface (namely, the large bottom surface of the head of the ribbon), the inner wall of the through hole is provided with a cantilever, the cantilever has certain elasticity, the cantilever is provided with 1 latch ratchet, 2 ratchet or 3 latch ratchets, the number of the latch ratchets arranged on the cantilever is less, the thickness of the head of the ribbon is smaller, the pitch of the latch ratchets is generally 0.7mm-1.2mm, and each latch ratchet is in a triangular shape;

further, keep away from at the ribbon head that is rectangular platform shape the outside of ribbon area body sets up into jiao kou promptly ribbon runner, is different from traditional ribbon, sees from the bottom surface of perpendicular to rectangular platform, the width setting of ribbon runner is more than 1.5-3.5mm (generally getting 2.0mm, and the ribbon runner of traditional single-end nylon ribbon in bulk is generally less than width 0.8mmX0.4mm thickness), and this width is far greater than the ribbon runner width size of traditional ribbon so that guarantee the ribbon runner with there is sufficient joint strength ribbon head, the thimble sets up in the bottom of sprue or subchannel and need not the ribbon head bottom surface sets up the thimble, has avoided the excessive ejection of material of thimble to appear in the ribbon head, adopts the automatic ribbon runner of cutting die to tear the method of separating ribbon and ribbon runner in order to replace traditional manual the excision, has avoided the runner residual material of ribbon head like this effectively.

Further, the band body of the binding band is in a band shape, one surface of the band body of the binding band forms an angle of 180 degrees with the larger bottom surface of the rectangular platform-shaped binding head, the thickness of the band body of the binding band is generally 1.0mm-1.5mm, and the width of the band body of the binding band is smaller than that of the through hole of the binding head, so that the band body of the binding band can pass through the hole of the binding head;

furthermore, triangular belt body ratchets are uniformly arranged on the belt body of the binding belt along the length direction of the belt body of the binding belt, the triangular teeth are uniformly arranged on the belt body of the binding belt along the length direction of the belt body of the binding belt, the belt body ratchets are arranged on the same side of the larger bottom surface of the head of the binding belt, and the binding belt is called as a positive tooth binding belt; or the ratchet of the band body is arranged on the same side of the smaller bottom surface of the head of the rectangular platform-shaped binding band, and the binding band is called a reverse tooth binding band; whether the ribbon is a positive-tooth ribbon or a reverse-tooth ribbon, the tooth tops of the triangular ribbon body ratchets do not exceed the surface of the ribbon body of the ribbon;

furthermore, the edge at the joint of the ribbon body and the ribbon head is rounded, so that stress concentration is avoided;

furthermore, a clearance groove is formed in the joint of the band body and the head of the band (one side provided with the triangular ratchet of the band body), stress concentration at the joint of the band body and the head of the band is avoided, the length of the clearance groove is 1-5mm, and the clearance groove spans the band body and follows the connecting line of the head of the band and extends to the head of the band.

Further, different from a traditional ribbon, the ribbon tail is a parallel extending section at one end far away from the ribbon head along the length direction of the ribbon body, namely, the included angle between the ribbon tail and the ribbon body is 180 degrees, at least one surface of the two larger surfaces of the ribbon tail is coplanar with one surface of the two larger surfaces of the ribbon body, the thickness of the ribbon tail is thinner than that of the ribbon body and is generally 0.5-0.9mm thick, and the ribbon tail does not have the triangular ribbon body ratchet.

Furthermore, in order to increase the friction force for grabbing the tail part of the binding belt by a tightening wheel of automatic binding equipment or an automatic binding tool, convex ribs are uniformly arranged in the length direction of the tail part of the binding belt, the length direction of the convex ribs is vertical to the length direction of the belt body of the binding belt, and the convex ribs are arranged on the same side of the ratchet teeth of the belt body or on the reverse side of the ratchet teeth of the belt body.

Further, the invention also provides a die ejection method of the bulk single-head self-locking nylon cable tie, which comprises the following steps: the size of the ribbon pouring gate is increased, an ejector pin is not arranged on the small bottom surface of the ribbon head, an ejector pin is arranged at the bottom of the main runner or the sub-runner, and when the ejector pin ejects out of the main runner or the sub-runner, the ribbon head is pulled out through the increased ribbon pouring gate.

Drawings

FIG. 1 is an isometric view of an embodiment of the invention;

FIG. 2 is an isometric view of an embodiment of the invention;

FIG. 3 is an isometric view of a conventional single-ended self-locking nylon cable tie;

FIG. 4 is a cross-sectional view of a conventional single-ended self-locking nylon cable tie in a bundled condition;

FIG. 5 is an isometric view of a conventional single-ended self-locking nylon cable tie;

FIG. 6 is a top view of an embodiment of the present invention;

FIG. 7 is a front view of an embodiment of the present invention;

FIG. 8 is a bottom view of an embodiment of the present invention;

FIG. 9 is a cross-sectional view taken along line T-T of FIG. 6, showing 3 locking ratchets on the cantilever;

fig. 10 is an enlarged view of a portion a corresponding to fig. 9;

FIG. 11 is an enlarged view of portion B corresponding to FIG. 9;

FIG. 12 is a cross-sectional view taken at T-T corresponding to FIG. 6, with 2 latch ratchets provided on the cantilever;

FIG. 13 is an enlarged view of portion C corresponding to FIG. 12;

FIG. 14 is a cross-sectional view of a conventional single-ended self-locking nylon cable tie in place within a guide rail of an automatic cable tie apparatus;

fig. 15 is a sectional view of a state in which a conventional single-ended self-locking nylon cable tie is pushed rightward on an automatic cable tie apparatus;

FIGS. 16, 17, and 18 are cross-sectional views of the example of the present invention in a state screened on the oscillating guide rail;

FIG. 19 is an isometric view of an embodiment of the present invention with a strap tail about to enter a pull tab wheel of the automatic strap apparatus;

FIG. 20 is a U-U cross-sectional view of a mold structure of a conventional single-ended self-locking nylon cable tie;

FIG. 21 is a top view of a mold configuration of a conventional single-ended self-locking nylon twist tie with the front mold removed;

FIG. 22 is a V-V cross-sectional view of a mold configuration for a machine use bulk single-start self-locking nylon cable tie and a method of mold ejection thereof in accordance with the present invention;

FIG. 23 is a top view of the mold configuration of a machine used bulk single head self locking nylon cable tie and its mold ejection method of the present invention with the front mold removed;

FIG. 24 is a front elevation view of an embodiment of the inverted tooth design of a machine used bulk single head self locking nylon cable tie and its mold ejection method of the present invention;

FIG. 25 is a bottom view of an embodiment of the inverted tooth design of a machine used bulk single head self locking nylon cable tie and its mold ejection method of the present invention;

FIG. 26 is a cross-sectional view R-R corresponding to FIG. 25;

fig. 27 is an enlarged view of a portion D corresponding to fig. 26;

fig. 28 is an enlarged view of a portion E corresponding to fig. 26;

the T-T section and the R-R section in the drawing are central planes of the bulk single-head self-locking nylon cable tie for the machine and the mould ejection method thereof. For convenience of description, the conventional bulk single-head self-locking nylon cable tie and the 'machine bulk single-head self-locking nylon cable tie and the die ejection method thereof' in the invention are simply referred to as 'cable ties' in the specification without causing confusion.

Reference numerals: 1. a head of the binding tape; 11. the big bottom surface of the head of the binding belt; 12. the small bottom surface of the head of the binding belt; 13. a through hole; 14. a cantilever; 141. a latch ratchet; 2. the ribbon body; 21. a belt body ratchet; 22. an empty avoiding groove; 23. the upper surface of the belt body; 24. the lower surface of the belt body; 3. binding the tail part of the belt; 31. a tail upper surface; 32. the lower surface of the tail part; 33. a rib is protruded; 41. a main flow passage; 42. a shunt; 43. A ribbon gate; 44. residual materials of the pouring gate; 51. a front mold core; 52. a rear mold core; 53. a thimble; 54. printing on a thimble; 55. the thimble overflows the material; 56. discharging by corner overflow; 57. a head mold core; 58. a thimble; 61. a vibration guide rail; 62. a linear guide rail; 63. pressing a plate; 64. a material pushing base; 65. a material pushing rod; 66. a guide member; 67. and (5) tensioning the wheel.

It should be noted that: as shown in fig. 9-11, the upper belt body surface 23 is a desired surface through the maximum profile of the upper portion of the belt body; 26-28, the upper belt body surface 24 is a desired surface through the maximum profile of the lower portion of the belt body; as shown in fig. 11 and 28, N-N is a symmetric center plane between the upper belt body surface 23 and the lower belt body surface 24 (or called a symmetric center plane of the belt body thickness, or called a median plane of the belt body thickness), and M-M is a symmetric center plane between the upper tail surface 31 and the lower tail surface 32 (or called a symmetric center plane of the belt tail thickness, or called a median plane of the belt tail thickness); the expression "the included angle between the band tail 3 and the band body 2 is 180 degrees" means that at least one of the two larger surfaces of the band tail forms an included angle of 180 degrees with one of the two larger surfaces of said band body, or at least that the included angle between the centre plane M-M of the thickness of the band tail and the centre plane N-N of the thickness of the band body forms 180 degrees.

Detailed Description

The following description of the conventional bulk single-head self-locking nylon cable tie and the present invention will be made by reference to the accompanying drawings and the detailed description thereof:

referring to fig. 3, fig. 4, fig. 5, fig. 20, and fig. 21, in this embodiment, in order to facilitate a worker to predict a bending direction in advance, a ribbon tail 2 of a conventional bulk single-head self-locking nylon ribbon is at a certain angle with a ribbon body 3 (that is, the ribbon tail 3 is warped to a certain extent relative to the ribbon body), as shown in fig. 3 and fig. 4, the warping direction of the ribbon is the same as the bending direction of the ribbon bundling, a mold for forming the ribbon also needs to be manufactured according to a corner of the ribbon tail 3, and the manufacturing accuracy is reduced (unable to perform grinding processing at one time) due to the existence of a corner of the mold, inevitably, a corner portion where the ribbon tail 2 of the conventional bulk single-head self-locking nylon ribbon is connected with the ribbon body 3 generates a corner overflow discharge 56 (100 to 200 ribbons are produced in one mold, the overflow of each corner is different, and the accuracy of the mold is different with the forming pressure and temperature, and the overflow of the corner of each caliper cannot be predicted), and this corner overflow of each caliper cannot be predicted), this corner discharge 56 sometimes cannot be seen by using measurement, but the measurement at the width of the corner is larger than the width of the size of the ribbon body 2; due to the combined effects of the high temperature of at least 120-180 degrees (different surface and core cooling speeds) when the ribbon comes out of the die, the thermal stress after the die stripping, the uncontrollable mechanical stress generated by mutual extrusion and the like, the warping angles of the ribbon tail 3 actually produced by the die relative to the ribbon body 2 of the ribbon are uneven; in addition, as shown in fig. 20, in order to solve the problem of demolding of the ribbon head 1, the thimble 53 is arranged on one side of the small bottom surface 12 of the ribbon head, and because the available solid area of the small bottom surface 12 of the ribbon head is very small, the thimble 53 arranged on one side of the small bottom surface 12 of the ribbon head can only be a round thimble with a diameter of about 1mm or a flat thimble with a width of about 1mm, and the slender thimble 53 has poor rigidity and is easy to skew, so that a gap is quickly ground between the thimble 53 and the rear mold core 52, and the thimble 55 is easy to overflow and discharge on the periphery of the thimble 53, and the thimble 53 has a small contact area with the small bottom surface 12 of the ribbon head and large contact stress, and a very clear concave thimble print 54 is also left on the small bottom surface 12 of the ribbon head; furthermore, 100-200 conventional bulk single-head self-locking nylon cable ties are produced in one die, in order to improve the efficiency of tearing and separating the cable ties from the cable tie gates 43 by hands of workers, the cable tie gates 43 are made to be small in size (the cable tie gates of the conventional bulk single-head nylon cable ties are generally smaller than 0.8mmX0.4mm in width), and as shown in FIG. 5, after the cable ties and the cable tie gates 43 are separated by hands of workers, gate residues 44 with irregular shapes and sizes are inevitably left on the side surfaces of the cable tie head 1;

as shown in FIG. 3, the small bottom surface 12 of the tie head of the conventional bulk single-head self-locking nylon tie is not parallel to the large bottom surface 11 of the tie head, and generally 3 locking ratchets 141 are arranged on the cantilever 14;

further, as shown in fig. 14 and 15, both the automatic band binding equipment and the automatic band binding tool need to position and feed by using the upper and lower bottom surfaces and the side surfaces of the band head 1, however, the shapes and the sizes of the gate residual material 44, the corner overflow material 56 and the thimble overflow material 55 on the band head 1 of the conventional bulk single-head self-locking nylon band are irregular, and interfere with the guide groove and other parts of the linear guide rail 62 of the automatic band binding tool, so that the material is blocked; as shown in fig. 15, when the pushing rod 65 pushes the band on the pushing base 64 toward the guiding element 66 in the direction of the arrow, the uneven warping angle of the band tail 3 will also cause the band tail 3 to bend and jam.

Referring to fig. 1 and 2, in an embodiment of the present invention, a bulk single-head self-locking nylon cable tie for machine use includes a cable tie head 1, a cable tie body 2, and a cable tie tail 3.

Further, referring to fig. 6 to 11, in the embodiment of the present invention, the band head 1 is in a rectangular platform shape, unlike a conventional band, the upper and lower bottom surfaces of the band head (i.e., the rectangular platform) are designed to be parallel surfaces, the larger of the upper and lower bottom surfaces of the band head is called a large bottom surface 11 of the band head, the smaller of the upper and lower bottom surfaces of the band head is called a small bottom surface 12 of the band head, 1 through hole 13 perpendicular to the large bottom surface 11 of the band head is arranged in the center of the band head, a cantilever 14 is arranged on the inner wall of the through hole 13 closest to the band body 2, the cantilever 14 has certain elasticity, 1 latch 141, 2 latch ratchets 141, or 3 latch ratchets 141 are arranged on the cantilever, the smaller the latch ratchets 141 are arranged on the cantilever, the thickness of the band head 1 is smaller, the pitch between the latch ratchets and the latch ratchets is generally 0.7mm to 1.2mm, and each latch ratchet 141 is in a triangular shape;

further, referring to fig. 12 and 13, in the embodiment of the present invention, 2 locking ratchets 141 are disposed on the cantilever 14, and practice proves that, as long as the structure is properly processed, for a small-sized ribbon with a ribbon body width of less than 3mm, 2 locking ratchets 141 are disposed on the cantilever 14, and even 1 locking ratchet 141 is disposed on the cantilever 14, the self-locking requirement can be satisfied.

With reference to fig. 6 to 11, in the embodiment of the present invention, the band body 2 extends in a band shape along the large bottom surface 11 of the band head, the upper surface 23 of the band body 2 and the lower surface 24 of the band body are two larger surfaces of the band body 2, the upper surface 23 of the band body forms an angle of 180 degrees with the large bottom surface 11 of the band head, the thickness of the band body is generally 1.0mm to 1.5mm, and the width of the band body 2 is smaller than the width of the through hole 13 of the band head 1, so that the band body 2 can pass through the through hole 13 of the band head 1; triangular body ratchets 21 are uniformly arranged on the band body 2 along the length direction, the pitch of the triangular body ratchets 21 is the same as that of the locking ratchets 141 in the band head 1, and after the band body 2 penetrates through the through hole 13 of the band head 1, the body ratchets 21 and the locking ratchets 141 are matched to realize unidirectional self-locking, namely, the band body 2 can only be pulled in the direction of tightening a trapped object (from the large bottom surface 11 of the band head to the small bottom surface 12 of the band head) and cannot be retracted, the triangular body ratchets 21 are arranged on the same side of the large bottom surface 11 of the band head, and the band is called as a positive tooth band; or the triangular belt body ratchet 21 is arranged on the same side of the small bottom surface 12 of the head of the binding belt, and the binding belt is called a reverse tooth binding belt; whether the ribbon is a positive tooth ribbon or a negative tooth ribbon, the tooth tops of the triangular ribbon body ratchets 21 do not exceed the ribbon body upper surface 23 or the ribbon body lower surface 24;

referring to fig. 7, 9, 11 and 28, in the embodiment of the present invention, the band tail 3 is a parallel extension of the end away from the band head 1 along the length direction of the band body 2, that is, the included angle between the thickness of the band tail 3 and the band body 2 is 180 degrees, the upper tail surface 31 and the lower tail surface 32 are two larger surfaces of the band tail 3, and the lower tail surface 32 and the lower band surface 24 are on the same plane, so that when the thickness of the band tail 3 and the band body 2 are allowed to be connected with a step, the lower tail surface 32 and the lower band surface 24 are at least parallel (that is, the included angle between the lower tail surface 32 and the lower band surface 24 is 180 degrees), if the thickness of the band body 2 is not the same (for example, the band body 2 is tapered in the length direction) or the thickness of the band tail 3 is not the same (the thickness of the band tail 3 is tapered in the length direction), then at least the thickness symmetric center plane N-N of the band body 2 and the thickness symmetric center plane M-M of the band tail 3 are 180 degrees; the thickness of the tail part 3 of the ribbon is thinner than that of the ribbon body 2 of the ribbon, the thickness of the tail part 3 of the ribbon is generally 0.5-0.9mm, the tail part 3 of the ribbon does not have the triangular body ratchet 21, the friction force for grabbing the tail part 3 of the ribbon by the tensioning wheel of the automatic bundling device or the automatic ribbon tool is convenient, a plurality of convex ribs 33 vertical to the length direction of the ribbon body 2 are arranged in the length direction of the tail part 3 of the ribbon at equal intervals, the convex ribs 33 are arranged on the same side or the reverse side of the triangular body ratchet 21 of the ribbon body, and as shown in fig. 19, the convex ribs 33 mainly grab the tail part 3 of the ribbon by the tensioning wheel 67 of the automatic ribbon tool for increasing the friction force.

Referring to fig. 16, fig. 17 and fig. 18, in this embodiment, the vibration of the vibration guide rail 61 feeds the single-head self-locking nylon cable tie for bulk use according to the present invention to the visual direction of the reader, the cable tie can fall on the vibration guide rail in different directions, the center of gravity of the cable tie shown in fig. 18 is located at the highest position due to different heights of the center of gravity of the cable tie, the side surface of the cable tie body contacts with the inclined surface of the vibration guide rail 61, the center of gravity of the cable tie is located at the highest position, and the contact surface between the side surface of the cable tie body and the guide rail 61 is the smallest, which is an unstable state, so that the state shown in fig. 18 can only exist instantly, and the state shown in fig. 18 is changed to the state shown in fig. 16 or fig. 17, but in the state shown in fig. 17, although the larger upper surface 23 of the cable tie body contacts with the vibration guide rail 61, under the gravity and the vibration force of the cable tie, the cable tie can slide down along the inclined surface of the vibration guide rail 61 (as shown in the arrow direction in fig. 17), as shown in figure 16, the step of the band head 1 is used for hooking the upper edge of the vibration guide rail 61, and a larger surface of the band body 2, namely the lower surface 24 of the band body, is contacted with the guide rail 61, so that the band shown in figure 16 has the most stable state on the vibration guide rail 61, namely the band can be screened off on the vibration guide rail 61 in other directions, only the band shown in figure 16 can be stably fed forward by the vibration guide rail 61, the bands after being screened and fed by the vibration of the vibration guide rail 61 are arranged in the consistent direction shown in figure 16, the invention automatically orients the band by the vibration of the vibration guide rail and the self-gravity of the band without pre-judging the bending direction of the band by human eyes, therefore, the tail 2 of the bulk single-head self-locking nylon band for machine provided by the invention is 180 degrees with the band body 3, at least one of the larger surfaces of the tail 2 is coplanar with the larger surface of the body 3.

Referring to fig. 20, 21, 22 and 23, in this embodiment, fig. 20 and 21 show a mold structure for molding a conventional bulk single-head self-locking nylon cable tie, a cable tie tail of the conventional bulk single-head self-locking nylon cable tie is not 180 degrees from a cable tie body, that is, the cable tie tail and the cable tie body are not coplanar, so that the mold parting surfaces of a front mold core 51 and a rear mold core 52 of the conventional bulk single-head self-locking nylon cable tie are correspondingly made to be non-coplanar, which increases the difficulty of mold processing, and particularly, it is difficult to ensure the dimensional accuracy and the surface finish of the mold at the joint part of the cable tie tail 3 and the cable tie body 2, so that the cable tie is easily subjected to corner overflow 56 like a cobra shown in fig. 5; fig. 22 and 23 show a structural diagram of a die for forming a bulk single-head self-locking nylon cable tie for machine of the present invention, because the tail 3 of the cable tie is 180 degrees from the body 2 of the cable tie, the die parting surface of the die is a plane, and can be ground and processed at one time, the die has much higher dimensional accuracy and surface smoothness, and the processing difficulty is much lower, so that the bulk single-head self-locking nylon cable tie for machine of the present invention can obtain a die with high accuracy and long service life with low die manufacturing cost, and then produce a high-quality cable tie.

With reference to fig. 5, 14, 20 and 22, as shown in fig. 20, due to the existence of the cantilever 14 and the locking ratchet 141 in the tie head 1, the die is required to be provided with the head mold core 57, in order to release the tie head 1 from the die, the conventional die for bulk single-head self-locking nylon tie needs to be provided with the thimble 53 below the small bottom surface 12 of the tie head 1 of each tie head 1, and since the usable solid area of the small bottom surface 12 of the tie head is very small, the thimble 53 provided on one side of the small bottom surface 12 of the tie head can only be a circular thimble with a diameter of about 1mm or a flat thimble with a width of about 1mm, the slender thimble 53 has poor rigidity and is easy to tilt, so that the thimble 53 and the rear mold core 52 quickly wear out a gap, and an overflow material 55 as shown in fig. 5 and 14 is easy to be generated around the thimble 53, and the thimble 53 has a small contact area with the small bottom surface 12 of the small bottom surface of the tie head, and a large contact stress, and a clear concave thimble 54 is also left on the small bottom surface 12 of the tie head; in addition, a thimble 58 is also provided on the strap body.

With continuing reference to fig. 20, 21, 22 and 23, as shown in fig. 22 and 23, in the mold structure for forming the single-head self-locking bulk nylon cable tie of the present invention, there is no thimble 53 under the small bottom 12 of the cable tie head, but the thimble 53 is disposed under the main runner 41, the thimble 53 pushes the main runner 41, and the main runner 41 pushes the cable tie head 1 out of the mold through the branch runner 42 and the cable tie gate 43, the thimble 53 disposed under the main runner 41 has enough space to make it thicker, so as to ensure the rigidity and strength of the thimble 53, compared with fig. 23 and 21, the cable tie gate 43 of the single-head self-locking bulk nylon cable tie of fig. 23 used in the present invention is thicker than the cable tie gate 43 of fig. 21, and the mold of the conventional single-head self-locking bulk nylon cable tie of fig. 21 is designed to facilitate the worker to tear the cable tie away from the gate 43 by hand, so as to make the size of the cable tie gate as smaller as possible; however, the ribbon gate 43 applied to the invention in fig. 23 is made as large as possible to ensure that the connecting strength of the ribbon gate 43 and the ribbon head 1 can reliably pull the ribbon out of the mold, and then the ribbon gate 43 and the ribbon head 1 are automatically cut off and separated by a cutting die; the thimble 58 is also arranged on the band body of the band, or the thimble 58 is arranged at the position 1-3mm away from the head of the band.

Referring to fig. 24, fig. 25, fig. 26, fig. 27 and fig. 28, in this embodiment, the technology of the present invention is applied to the design of the inverted tooth ribbon, as shown in fig. 26 and fig. 27, the inner wall of the through hole 13 of the cantilever 14 is far away from one side of the ribbon body 2, and 1 locking ratchet 141, 2 locking ratchets 141, or 3 locking ratchets 141 are arranged on the cantilever 14; triangular body ratchets 21 are uniformly arranged on the band body 2 along the length direction, for a reverse-tooth band, the triangular body ratchets 21 are arranged on the same side of the small bottom surface 12 of the head of the band, the pitch of the triangular body ratchets 21 is the same as that of the latch ratchets 141 in the band head 1, and after the band body 2 penetrates through the through hole 13 of the band head 1, the body ratchets 21 and the latch ratchets 141 are matched to realize unidirectional self-locking, namely the band body 2 can only be pulled in the direction of tightening a trapped object (from the large bottom surface 11 of the head to the small bottom surface 12 of the head of the band) and cannot be retracted, the tail 2 of the band and the band body 3 form an angle of 180 degrees, the upper surface 31 of the tail and the upper surface 23 of the band body are on the same plane, namely the upper surface 31 of the tail and the upper surface 23 of the band body are coplanar, therefore, for the reverse-tooth band, at least one larger surface in the tail 2 of the band is parallel to the larger surface in the band body 3; or at least the included angle between the thickness symmetrical center plane N-N of the band body 2 and the thickness symmetrical center plane M-M of the band tail 3 is 180 degrees (namely the thickness symmetrical center plane N-N of the band body 2 is parallel to the thickness symmetrical center plane M-M of the band tail 3).

In the embodiment of the invention, as shown in fig. 10 and 13, the edge of the joint between the band body 2 and the band head 1 is rounded to avoid stress concentration.

With continuing reference to fig. 10 and fig. 13, in the embodiment of the present invention, for a bulk single-head self-locking nylon cable tie for machine with orthodontic design, or a clearance groove 22 is provided at the joint (the side provided with triangular teeth) of the cable tie body 2 and the cable tie head 1, so as to avoid stress concentration at the joint of the cable tie body 2 and the cable tie head 1 when the cable tie is bent, the length of the clearance groove 22 is 1-5mm, and the clearance groove 22 spans the connecting line between the cable tie body 2 and the cable tie head 1 and extends to the cable tie head 1; as shown in fig. 24 to 27, for a bulk single-head self-locking nylon cable tie for machine of the inverted tooth design, or the cable tie body 2 is thinned at the joint of the cable tie body 2 and the cable tie head 1, the clearance groove 22 does not extend to the cable tie head 1; it should be noted that: the clearance groove 22 is not a necessary structure, and the clearance groove 22 can be omitted for a bulk single-head self-locking nylon cable tie for a machine with a positive tooth design or a negative tooth design.

With continued reference to fig. 22 and 23, the present invention further provides a method for ejecting a bulk single-head self-locking nylon cable tie from a mold, comprising: the size of the ribbon head pouring gate 43 is increased without arranging an ejector pin on the small bottom surface 12 of the ribbon head, the ejector pin 53 is arranged at the bottom of the main runner 41 or the sub-runner 42, and when the ejector pin 53 ejects out of the main runner 41 or the sub-runner 42, the ribbon head 1 is pulled out through the enlarged ribbon pouring gate 43.

Appropriate changes and modifications to the embodiments described above will become apparent to those skilled in the art from the disclosure and teachings of the foregoing description. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and variations of the present invention should fall within the scope of the claims of the present invention. Furthermore, although specific terms are employed herein, they are used in a generic and descriptive sense only and not for purposes of limitation.

Industrial applicability

According to the bulk single-head self-locking nylon cable tie for the machine and the mold ejection method thereof, automatic binding of the cable tie is conveniently realized, the defects of high labor intensity and low binding efficiency of manual binding operation are overcome, and the manufacturing cost of the mold is reduced and the service life of the mold is prolonged by adopting a straight tail design; the large ribbon gate is adopted, so that the requirements on temperature and pressure during injection molding are lower, and energy is saved; the adoption of a larger ribbon gate can also ensure the compact texture of the ribbon and improve the tensile strength of the ribbon; the cutting die is adopted to cut off the pouring gate of the ribbon, so that the labor intensity of workers is greatly reduced, and the pouring gate residual material at the head of the ribbon is avoided; not only is the mould structure simplified but also the ejector pin seal and the ejector pin overflow discharge at the head of the ribbon are avoided by arranging the ejector pin at the head of the ribbon, and great benefits are provided for the appearance of a product and the automatic feeding of the ribbon.

Claims (10)

1. A bulk single-head self-locking nylon cable tie for a machine comprises a cable tie head, a cable tie body and a cable tie tail, wherein the cable tie head is in a rectangular table shape, the center of the cable tie head is provided with 1 through hole vertical to the large bottom surface of the cable tie head, the inner wall of each through hole is provided with 1 cantilever, each cantilever has elasticity, the cantilever is provided with 1-3 lock catch ratchets, and each lock catch ratchet is triangular; at least one of the two larger surfaces of the band body of the band forms an included angle of 180 degrees with the large bottom surface of the head of the band; evenly set up triangular belt body ratchet along length direction on the tie belt body, its characterized in that: the tail part of the ribbon is a parallel extension section in the length direction of the ribbon body, and the included angle between the tail part of the ribbon and the ribbon body is 180 degrees; in the process of ejecting the ribbon from the forming mold, an ejector pin is not arranged below the small bottom surface of the head of the ribbon in the mold structure, the ejector pin is arranged below the main runner, the main runner is pushed by the ejector pin, and the head of the ribbon is ejected out of the mold through the main runner, the sub-runner and the ribbon pouring gate.

2. The bulk single-head self-locking nylon cable tie for the machine according to claim 1, characterized in that: the ribbon head sets up the ribbon runner of width more than 2mm, guarantee the ribbon runner with the ribbon head has sufficient joint strength.

3. The bulk single-head self-locking nylon cable tie for the machine of claim 1, wherein: the head of the ribbon is not provided with the thimble print.

4. The bulk single-head self-locking nylon cable tie for the machine according to claim 1, characterized in that: for a bulk single-head self-locking nylon cable tie for a machine with a positive tooth design, the cantilever is arranged on the inner wall of a through hole of the cable tie head part close to one side of the cable tie body; to the single-end auto-lock nylon ribbon in bulk that the machine of anti-tooth design was used, the cantilever setting is keeping away from on the inner wall of the ribbon head's of ribbon area one side through-hole.

5. The bulk single-head self-locking nylon cable tie for the machine of claim 1, wherein: the pitch of the belt body ratchet is the same as that of the lock catch ratchet in the head of the binding belt, and the belt body ratchet is matched with the lock catch ratchet in the head of the binding belt to realize unidirectional self-locking, namely, the belt body of the binding belt can only be pulled from the large bottom surface of the head of the binding belt to the small bottom surface of the head of the binding belt and cannot be retracted.

6. The bulk single-head self-locking nylon cable tie for the machine according to claim 1 or 5, wherein: for a bulk single-head self-locking nylon cable tie for a machine with a positive tooth design, the ratchet of the strap body is arranged on the same side of the large bottom surface of the head of the cable tie; for the bulk single-head self-locking nylon cable tie for the machine with the inverted tooth design, the ratchet of the strap body is arranged on the same side of the small bottom surface of the head of the cable tie.

7. The bulk single-head self-locking nylon cable tie for the machine of claim 1, wherein: the length direction of ribbon afterbody evenly sets up protruding muscle, the length direction of protruding muscle is perpendicular with the length direction of ribbon body, protruding muscle arrange with the homonymy of ribbon body ratchet or arrange with the reverse side of ribbon body ratchet.

8. The bulk single-head self-locking nylon cable tie for the machine according to claim 1 or 4, wherein: the ribbon is provided with on the area body and sets up the dead slot of keeping away, it sets up to keep away the dead slot the ribbon head with the junction of ribbon area body.

9. The bulk single-head self-locking nylon cable tie for the machine according to claim 1, characterized in that: for a bulk single-head self-locking nylon cable tie for a machine with a positive tooth design or a negative tooth design, at least one of the two larger surfaces of the tail part of the cable tie is coplanar with one of the two larger surfaces of the strap body of the cable tie; or at least the thickness symmetrical center plane of the band tail and the thickness symmetrical center plane of the band body form an included angle of 180 degrees.

10. A die ejection method for a bulk single-headed self-locking nylon cable tie for a machine according to any one of claims 1 to 4, characterized in that: in the die structure, an ejector pin is not arranged below the small bottom surface of the head of the ribbon, but is arranged below the main runner, the ejector pin pushes the main runner, and the head of the ribbon is ejected out of the die through the main runner, the sub-runner and the ribbon pouring gate.

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