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CN-121977434-A - Detection device and detection method for straightness of metal wire

CN121977434ACN 121977434 ACN121977434 ACN 121977434ACN-121977434-A

Abstract

The invention discloses a detection device for metal wire straightness, which comprises a fixed backboard, wherein an upper wire passing wheel used for guiding a steel wire to pass through is sequentially arranged on the front surface of the fixed backboard from top to bottom, a chuck used for clamping the steel wire, a detection ring used for extracting contact electric signals and a lower wire passing wheel used for guiding the steel wire to pass through are sequentially arranged on the front surface of the fixed backboard, the chuck and the detection ring are respectively connected with power output ends of the upper opening and closing device and the lower opening and closing device.

Inventors

  • ZHANG SHIWEI
  • ZHANG XIANCHENG
  • ZHANG LIANGBING

Assignees

  • 苏州晶切技术有限公司

Dates

Publication Date
20260505
Application Date
20260325

Claims (8)

  1. 1. The detection device for the straightness of the metal wire is characterized by comprising a fixed back plate (1), wherein an upper wire passing wheel (2) for guiding a steel wire (8) to pass through, a clamping head (3) for clamping the steel wire (8), a detection ring (4) for extracting contact electric signals and a lower wire passing wheel (5) for guiding the steel wire (8) to pass through are sequentially arranged on the front surface of the fixed back plate (1) from top to bottom, the clamping head (3) and the detection ring (4) are respectively connected to power output ends of an upper opening and closing device (6) and a lower opening and closing device (7), the upper opening and closing device (6) and the lower opening and closing device (7) respectively drive the clamping head (3) and the detection ring (4) to open or close, the distance L between the upper part and the lower part of the clamping head (3) and the detection ring (4) is adjustable, the steel wire (8) is configured to sequentially pass through the upper wire passing wheel (2), the clamping head (3), the detection ring (4) and the lower wire passing wheel (5), and the steel wire (8) are kept concentric with the detection ring (4) under a tensioning state.
  2. 2. The device for detecting the straightness of a metal wire according to claim 1, wherein an upper bracket (101) and a lower bracket (102) are respectively connected to the upper end and the lower end of the front surface of the fixed back plate (1), and the upper wire passing wheel (2) and the lower wire passing wheel (5) are respectively and rotatably connected to one ends of the upper bracket (101) and the lower bracket (102).
  3. 3. The device for detecting the straightness of a metal wire according to claim 1, wherein the upper opening and closing device (6) and the lower opening and closing device (7) are finger cylinders.
  4. 4. A device for detecting the straightness of a metal wire according to claim 3, wherein the clamping head (3) is two clamping pieces which are symmetrically arranged, and the clamping head (3) is fixedly connected to the inner side of a clamping jaw of the finger cylinder.
  5. 5. The device for detecting the straightness of a metal wire according to claim 3, wherein the detecting ring (4) is two semicircular rings which are symmetrically arranged, and one end of each semicircular ring is fixedly connected to the inner side of a clamping jaw of the finger cylinder.
  6. 6. A device for detecting the straightness of a metal wire according to claim 3 is characterized in that an adjusting groove in the vertical direction is formed in the fixed back plate (1), an adjusting bolt A and an adjusting bolt B penetrate through the adjusting groove and are respectively and fixedly connected to an upper opening and closing device (6) and a lower opening and closing device (7), and after the adjusting bolt A and the adjusting bolt B are loosened, the upper opening and closing device (6) and the lower opening and closing device (7) can slide up and down along the adjusting groove.
  7. 7. A method for detecting the straightness of a wire using the device for detecting the straightness of a wire according to any one of claims 1 to 6, comprising the steps of: S1, during normal production, the chuck (3) and the detection ring (4) are controlled to be in an open state, so that threading and operation of the steel wire (8) are facilitated; S2, stopping the operation of the steel wire (8) after the production of a coil of the steel wire (8) is completed, and controlling the clamping head (3) and the detection ring (4) to be closed so as to clamp the steel wire (8); S3, cutting or fusing the steel wire (8) to enable the steel wire (8) to form a free end in the direction of downwards passing through the wire wheel (5) at the clamping position of the clamping head (3), if the straightness of the steel wire (8) is unqualified and is bent, touching the detection ring (4), otherwise, not touching the detection ring (4), and judging the straightness of the steel wire (8).
  8. 8. The method for detecting the straightness of the metal wire according to claim 7, wherein the distance between the clamping head (3) and the detecting ring (4) is L, the diameter of the detecting ring is D, a fixed point of the clamping head (3) for clamping the steel wire (8) is E, the position where the free end of the steel wire (8) is just contacted with the detecting ring is B point, the circle center of a circle Z where the B point and the E point are positioned is O, the symmetrical point of the B point on the circle Z is A, the vertical point of the OE and the AB is C, the CE and the CB are taken as two sides to form a rectangle, and the other vertex opposite to the C point is F point; When the steel wire (8) is bent and just contacts with the detection ring, fb=ec is the radius of the detection ring, cb=ef is the distance L between the fixed point of the steel wire (8) and the detection ring, therefore, the radius fb=ec=eo-CO of the detection ring, OB is the diameter of the steel wire (8) ring, CB is the distance L between the fixed point of the steel wire (8) and the detection ring, and the right triangle formed by COB can calculate CO according to OB and CB, thereby calculating the relation between the radius of the detection ring, the diameter of the steel wire (8) ring and the distance L, namely l=sqrt (ob×ob- (OB-EC)) x (OB-EC).

Description

Detection device and detection method for straightness of metal wire Technical Field The invention relates to the technical field of metal wire straightness detection, in particular to a device and a method for detecting metal wire straightness. Background The metal wire is used as a basic raw material for industrial production, is widely applied to various fields such as cables, springs, cable braiding, prestress structures and the like, and the geometric dimensional accuracy and physical properties of the metal wire directly determine the quality and the safety of a final product, wherein the straightness is one of core indexes for measuring the quality of the metal wire, and particularly plays a decisive role in the quality of the straightness when the steel wire, the aluminum wire and the copper wire are applied to the high-end manufacturing field. Specifically, the metal wires made of different materials have common but unique severe requirements on straightness because of the difference of physical characteristics: when the steel wire is used as a reinforcing core or a prestress steel strand of a cable, if the straightness is not up to standard, tiny bending or uneven residual stress distribution exists, internal mechanical balance can be destroyed after the steel wire is embedded into a product, potential torsion is accumulated, the phenomenon of twisting (starting a lantern and twisting) is extremely easy to induce in the subsequent paying-off and twisting processes, the product is scrapped if the steel wire is light, and production safety accidents are caused if the steel wire is heavy. The aluminum wire and the copper wire are widely applied to the wire and cable industry as conductive cores or shielding materials, and because aluminum and copper materials are relatively soft and have good ductility, plastic deformation and bending are easier to generate in the production process, if the straightness is poor, the uniformity of the coating thickness of an insulating layer can be influenced (core deflection is caused), and internal stress concentration can be generated during multi-strand twisting, so that the problems of snakelike bending, stress cracking and the like of a finished cable are caused in the laying or using process, and the conductive performance and the mechanical strength are seriously influenced. Therefore, the strict detection of the straightness of the metal wire is an indispensable link in the wire production process. However, in the existing wire production technology system, the detection means for the straightness of the metal wire is still relatively lagged, and the problems of low detection efficiency, poor precision, incapability of real-time feedback and the like generally exist, and the main current detection modes mainly comprise an off-line sampling detection method and an artificial visual method: In the off-line sampling detection method, an operator needs to pause a production line, intercept a metal wire sample (steel wire, aluminum wire or copper wire) with a certain length, place the metal wire sample on a special detection platform or a flat plate, measure the gap between the wire and the flat plate through a feeler gauge, or scan a static sample by using a laser measuring instrument, and the mode is relatively accurate in data, but belongs to 'post detection', and has serious time lag, particularly for soft metal wires such as copper wire, aluminum wire and the like, the natural state of the metal wire is changed by stress release after intercepting the sample, so that the measurement result cannot truly reflect the actual tension state on the production line, and once the problem is found, a large number of unqualified products are often produced, and great waste of precious metal raw materials is caused. The manual visual method is characterized in that on a continuous production line, operators with abundant experience often rely on naked eyes to observe the shaking condition of the head of a metal wire, or the shaking amplitude of the metal wire is sensed by hand touch in the running process of the wire, so that the method has obvious defects that firstly, the metal wire is greatly influenced by human factors and lacks quantitative data support, fatigue and experience difference of the workers are extremely easy to cause omission and misjudgment, secondly, the high-speed shaking risk of hard wires such as steel wires is observed at a short distance, potential safety hazards exist in manual short distance observation, and secondly, the tiny bending deformation is difficult to identify by naked eyes under specific illumination for materials with deeper colors or stronger light reflection properties such as copper wires and aluminum wires. In summary, the prior art has the remarkable defects that whether a sample is intercepted or stopped for inspection, the production continuity is broken, the rhythm of a modern high-speed wire production line is difficult to