Device for measuring pitch of braided cable based on Doppler effect

Abstract

The utility model relates to a device for measuring the pitch of a braided cable based on Doppler effect, comprising a box body, the top of the box body is fixedly provided with a box cover, the middle position of the left side of the inner bottom wall of the box body is fixedly provided with a collecting lens, and the left side of the inner bottom wall of the box body is fixedly provided with three reflectors. A beam splitter prism is fixedly mounted on the back of the left side of the inner bottom wall of the box body, a collimating lens is fixedly mounted on the back of the middle position of the inner bottom wall of the box body, a Laser is fixedly mounted on the back of the right side of the inner bottom wall of the box body, and a photoelectric detector is fixedly mounted in the center of the inner bottom wall of the box body. The laser is used as a light source, scattered light is converted into parallel light after passing through the collimating lens, finally, scattered light beams collected by the collecting lens are received by the photoelectric detector, photoelectric signal conversion is completed, amplification calculation is carried out through the internal amplification circuit, and on-line measurement of the knitting density can be achieved according to the Doppler effect.

Description

Technical Field

[0001] The utility model relates to the technical field of braided cables, in particular to a device for measuring the pitch of a braided cable based on the Doppler effect. Background Art

[0002] Braided cable refers to a wire material with braided material added to the outside of the wire. It is usually made by wrapping ropes or wires of different materials around the wire. The braided material can include polyester, fiber, fiberglass, copper wire and stainless steel, etc. They mainly play the role of protecting the wire, increasing the wear resistance and protective performance of the wire, thereby extending the service life of the wire.

[0003] The metal braided shielding layer in the cable structure, the size of the cable braiding density directly affects the shielding effect of the product. The larger the braiding density, the better the shielding effect, and the smaller the braiding density, the poorer the shielding effect. Therefore, the detection of the cable braiding density is to assess whether the cable meets the standard value. The detection methods in the prior art are: paper tape method: use a paper larger than the pitch length and a certain width to tighten on the stranded wire, use a pencil to make a mark along the weak line axis direction, the number of marks should be more than the number of strands in the outermost layer, mark the midpoint of one of the marks as the starting point, and count the number of single wires from the adjacent one through the outermost layer. The midpoint mark of the last mark is used as the end point, and the distance between the two marks on the paper measured with a steel ruler is the pitch. The paper tape method is mainly used to measure the twisted pitch of conductive cores such as aluminum stranded wire, steel core aluminum stranded wire, and copper stranded wire; the wire shifting method: carefully remove one of the outer layers of the wire and cable or the outer layer of the inner core of the stranded wire, and the removed length should not be less than the length of one pitch. Use a steel ruler to directly measure the distance between the removed conductors or cores in one axial circle, which is the pitch. This method is mainly suitable for cores with more outer layers or softer cores, such as large-section conductive cores and multi-core telephone cables. There are also direct methods and average methods.

[0004] The above measurement methods are all performed offline, that is, the measurement is performed after the cable production is completed. When the braiding speed changes or the cable production speed changes, the cable production braiding density will change accordingly. When the braiding density is less than the standard value, the cable has been completed and the produced cable may face scrapping. Utility Model Content

[0005] In view of the deficiencies of the prior art, the utility model provides a device for measuring the pitch of a braided cable based on the Doppler effect, which has the advantages of high qualified rate and good consistency, and solves the problem of high scrap rate of the prior art.

[0006] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a device for measuring the pitch of a braided cable based on the Doppler effect, comprising a box body, a box cover fixed on the top of the box body, a collecting lens fixedly installed in the middle position of the left side of the inner bottom wall of the box body, three reflecting mirrors fixedly installed on the left side of the inner bottom wall of the box body, a dichroic prism fixedly installed on the back of the left side of the inner bottom wall of the box body, a collimating lens fixedly installed on the back of the middle position of the inner bottom wall of the box body, a Laser fixedly installed on the back of the right side of the inner bottom wall of the box body, and a photoelectric detector fixedly installed at the center of the inner bottom wall of the box body.

[0007] Furthermore, three fixing holes are provided at the bottom of the right side of the box body, and the three fixing holes are evenly and equidistantly distributed from front to back.

[0008] Furthermore, DB25 interfaces are provided on the tops of the left and right sides of the box body, and the two DB25 interfaces are symmetrically distributed on the left and right sides.

[0009] Furthermore, an antenna outlet is provided on the top surface of the box cover, and the antenna outlet is rectangular.

[0010] Furthermore, a label is fixed on the right side of the top surface of the box body, and the label is located directly to the right of the antenna outlet.

[0011] Furthermore, the box body is rectangular, and a plurality of bolt holes are provided around the top surface of the box body.

[0012] Compared with the prior art, the technical solution of the present application has the following beneficial effects: the utility model uses Laser as a light source, and after passing through a collimating lens, the scattered light is converted into parallel light. Finally, the scattered light beam collected by the collecting lens is received by the photoelectric detector, the photoelectric signal conversion is completed, and the internal amplification circuit amplifies and calculates. According to the Doppler effect, the online measurement of the weaving density can be realized, the change of the intercept of the braided cable can be detected in real time, the weaving speed can be adjusted in real time, and the qualified rate and consistency of the finished braided cable can be improved and guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 It is a schematic diagram of the structure of the utility model;

[0014] Figure 2 This is a bottom view of the utility model;

[0015] Figure 3 This is a schematic diagram of the explosion structure of the utility model;

[0016] Figure 4 This is a schematic diagram of the explosion structure of the utility model from another perspective;

[0017] Figure 5 This is the principle diagram of the measurement system of the utility model;

[0018] Figure 6 This is a schematic diagram of the cross-sectional structure of the cable of the utility model.

[0019] In the figure: 1 box body, 2 box cover, 3 antenna outlet, 4 fixing hole, 5 DB25 interface, 6 collecting lens, 7 reflecting mirror, 8 splitting prism, 9 collimating lens, 10 Laser, 11 photodetector. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] See also Figure 1-6 In this embodiment, a device for measuring the pitch of a braided cable based on the Doppler effect includes a box body 1, a box cover 2 is fixed on the top of the box body 1, a collecting lens 6 is fixedly installed at the middle position of the left side of the inner bottom wall of the box body 1, three reflecting mirrors 7 are fixedly installed on the left side of the inner bottom wall of the box body 1, a splitter prism 8 is fixedly installed on the back of the left side of the inner bottom wall of the box body 1, a collimating lens 9 is fixedly installed on the back of the middle position of the inner bottom wall of the box body 1, a Laser 10 is fixedly installed on the back of the right side of the inner bottom wall of the box body 1, and a photoelectric detector 11 is fixedly installed at the center of the inner bottom wall of the box body 1.

[0022] Among them, three fixing holes 4 are opened at the bottom of the right side of the box body 1, and the three fixing holes 4 are evenly and equidistantly distributed from front to back. The front fixing hole 4 is a grounding hole, and the two fixing holes 4 on the back are water-cooling heat dissipation holes.

[0023] At the same time, DB25 interfaces 5 are provided at the tops of the left and right sides of the box body 1. The two DB25 interfaces 5 are symmetrically distributed on the left and right sides and can be connected via a data cable for data output.

[0024] In addition, an antenna outlet 3 is provided on the top surface of the box cover 2. The antenna outlet 3 is rectangular and can be used to connect the WI FI onboard antenna.

[0025] It should be noted that a label is fixed on the right side of the top surface of the box body 1 , and the label is located directly to the right of the antenna outlet 3 , and can be used to identify the parameters of the device.

[0026] It can be understood that the box body 1 is rectangular, and multiple bolt holes are opened around the top surface of the box body 1. The box body 1 and the box cover 2 are fixed together by bolts. The bottom surface of the box body 1 has multiple installation holes that can be used to install the device.

[0027] The working principle of the above embodiment is:

[0028] First, Laser 10 is used as a light source. After passing through a collimating lens 9, the scattered light is converted into parallel light. After passing through a 1:1 beam splitter prism 8, the parallel light forms two coherent light beams. The two coherent light beams pass through respective reflectors 7 and intersect at a position A on the surface of the braided cable. The coherent light beams interfere on the surface A and are scattered by scattering particles. The scattered light beams are received by a collecting lens 6. The photoelectric detector 11 receives the scattered light beams collected by the collecting lens 6, completes the photoelectric signal conversion, and amplifies and calculates through an internal amplifier circuit. It can be seen from the Doppler effect that the size of the Doppler frequency has nothing to do with the selected scattered light direction, but is only related to the angle θ between the two incident light beams. The scattered light frequency f occurring at A is measured by the frequency of the photoelectric detector 11. D , then the speed v of the cable movement can be obtained: When the braided cable moves and the measuring point of the measurement system overlaps with the braided cable at B, the overlapped braid at B will cause most of the scattered light that should be scattered in the directions of a1' and a2' to scatter in the directions of a1", a2". At this time, the amplitude of the light signal received by the photodetector 11 will be significantly reduced, and will show a corresponding regular change due to the braiding law. The frequency of this regular change is extracted separately and recorded as: f a , then we can get the intercept h: To ensure the effectiveness of the intercept, the intercept is averaged within a certain distance, so that the online measurement of the braiding density can be realized, the change of the intercept of the braided cable can be detected in real time, the braiding speed can be adjusted in real time, and the qualification rate and consistency of the finished braided cable can be improved and guaranteed.

[0029] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0030] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A device for measuring the pitch of a braided cable based on the Doppler effect, comprising a box body (1), characterized in that: A box cover (2) is fixed on the top of the box body (1); a collecting lens (6) is fixedly installed at the middle position of the left side of the inner bottom wall of the box body (1); three reflecting mirrors (7) are fixedly installed on the left side of the inner bottom wall of the box body (1); a beam splitter prism (8) is fixedly installed on the back of the left side of the inner bottom wall of the box body (1); a collimating lens (9) is fixedly installed on the back of the middle position of the inner bottom wall of the box body (1); a laser (10) is fixedly installed on the back of the right side of the inner bottom wall of the box body (1); and a photoelectric detector (11) is fixedly installed at the center of the inner bottom wall of the box body (1).

2. The device for measuring the pitch of a braided cable based on the Doppler effect according to claim 1, characterized in that: Three fixing holes (4) are provided at the bottom of the right side of the box body (1), and the three fixing holes (4) are evenly and equidistantly distributed from front to back.

3. The device for measuring the pitch of a braided cable based on the Doppler effect according to claim 1, characterized in that: The tops of the left and right sides of the box body (1) are both provided with DB25 interfaces (5), and the two DB25 interfaces (5) are symmetrically distributed on the left and right sides.

4. The device for measuring the pitch of a braided cable based on the Doppler effect according to claim 1, characterized in that: An antenna outlet (3) is provided on the top surface of the box cover (2), and the antenna outlet (3) is rectangular.

5. The device for measuring the pitch of a braided cable based on the Doppler effect according to claim 4, characterized in that: A label is fixed on the right side of the top surface of the box body (1), and the label is located directly to the right of the antenna outlet (3).

6. The device for measuring the pitch of a braided cable based on the Doppler effect according to claim 1, characterized in that: The box body (1) is rectangular, and a plurality of bolt holes are provided around the top surface of the box body (1).

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