Quality detection device for fiber rods such as cotton slivers

Abstract

The invention discloses a quality detection device for fiber rods such as cotton slivers, which comprises a cotton collection horn mouth and an elastic cotton guide gauge fixed on the cotton collection horn mouth, the cotton collection horn mouth and the elastic cotton guide gauge jointly form a channel for the fiber rods such as the cotton slivers, and the thickness change of the fiber rods such as the cotton slivers causes bending deformation of an elastic body and spacing displacement of an eddy current sensor. The sensor detects deformation and spacing displacement of the elastic body to obtain thickness and mass changes of cotton slivers or fibers. The device has the advantages of being high in online detection precision, high in high-speed online detection response frequency and good in dynamic characteristic in production of fibers such as cotton slivers, the yield of the fibers such as the cotton slivers in production can be greatly increased, and the production efficiency is improved.

Description

Technical Field

[0001] The present invention relates to textile machinery such as drawing frames, carding machines, sliver evenness meters and other textile equipment and chemical fiber drawing equipment, and a high-speed online detection device for the quality of fiber strips such as cotton strips. The device can detect the quality of fiber strips such as cotton strips online when such equipment produces fiber strips such as cotton strips at a high speed, thereby reducing the occurrence of defective products and improving the yield of finished products. Background Art

[0002] At present, with the advancement of science and technology, the operating speed of textile equipment is getting higher and higher. The traditional quality detection method of cotton slivers and other fiber strips cannot meet the online detection needs of high-speed equipment due to its low response frequency. In production practice, the traditional detection method has a high failure rate and poor stability, which can easily cause the quality of the cotton slivers and other fiber strips produced to decline and the defective rate to increase, affecting the production progress. Summary of the invention

[0003] The purpose of the present invention is to provide a device that can adapt to high-speed operating equipment to stably, reliably and efficiently detect the quality of fiber strips such as cotton strips online, in view of the drawbacks and shortcomings of the above-mentioned prior art, so as to reduce the occurrence of defective products in the production of fiber strips such as cotton strips and effectively improve the yield.

[0004] In order to achieve the above-mentioned purpose, the scheme adopted by the present invention is: the cotton collecting bell mouth 1 and the guide strip elastic body 2 of the double-beam structure form a channel for fiber strips such as cotton strips. During production, fiber strips such as cotton strips pass through the channel at high speed. Changes in the thickness and quality of fiber strips such as cotton strips will generate an extrusion force on the guide strip elastic body 2 of the channel component when passing through the channel at high speed, causing the elastic body to bend and deform. The strain gauge 3 installed on the elastic body beam outputs a linear signal related to the thickness and quality of fiber strips such as cotton strips as the bending deformation size of the beam. At the same time, the eddy current sensor 5 installed on the bell mouth detects the displacement signal of the elastic body caused by the extrusion channel of fiber strips such as cotton strips, which is used to detect the thickness and quality of fiber strips such as cotton strips. Both sensor signals are linearly amplified by the preamplifier 4 and can be used to control the equipment or control the equipment alone to make the output of fiber strips such as cotton strips meet the quality requirements.

[0005] Compared with the prior art, the present invention has the following advantages: the present invention adopts a double-beam structure elastomer, which has the characteristics of high response frequency, good stability, high reliability, low maintenance cost and long service life, and can be well adapted to high-speed and ultra-high-speed operating equipment for online detection of the quality of fiber strips such as cotton strips. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] The present invention will be described in detail below with reference to the accompanying drawings Figure 1 This is the working principle diagram of the present invention - plan view Figure 2 It is a schematic diagram of the structure of the present invention - top view Figure 3 The double beam guide bar elastic body structure diagram of the present invention Figure 4 This is a schematic diagram of the signal processing principle of the present invention. DETAILED DESCRIPTION

[0007] Reference Figure 1 The present invention includes a cotton collecting bell mouth 1 and a cotton sliver guiding elastic body 2 with a double beam structure, which together form a cotton sliver channel. When the cotton sliver enters the channel, an extrusion force is generated on the cotton sliver guiding elastic body 2 with a double beam structure. The extrusion force causes the elastic body to bend and deform. A strain gauge 3 installed on the elastic body outputs a voltage signal proportional to the thickness of the cotton sliver and is introduced into a preamplifier. The displacement change of the elastic body caused by the extrusion of the thickness of the cotton sliver is detected by an eddy current sensor 5 and a voltage signal proportional to the displacement is output and introduced into the preamplifier. The two analog sensor signals are introduced into the preamplifier 4 and linearly amplified after AD conversion, and can be used to control equipment or control equipment alone to make the output of cotton slivers and other fiber strips meet quality requirements.

[0008] Reference Figure 2 There are two measurement methods for the non-contact measurement of the eddy current sensor 5. One is the eddy current end area detection method 5-1. The specific method is that the end face of the eddy current sensor is close to the steel sheet 6 connected to the elastomer. When the edge of the steel sheet 6 blocks half of the end face area of ​​the eddy current sensor, the output value is taken as the intermediate value of the thickness of the cotton strip. The change in the thickness of the cotton strip will squeeze the elastomer 2 to displace the steel sheet 6 that blocks the end area of ​​the sensor, and the sensor output signal increases or decreases with the displacement of the steel sheet 6; the other is the eddy current sensor detection method 5-2 of the change in the distance between the elastomer 2 and the eddy current sensor 5. The change in the thickness of the cotton strip causes the deformation of the elastomer 2, that is, the distance between the elastomer 2 and the eddy current sensor 5 changes. The thicker the cotton strip, the greater the bending of the beam, that is, the distance between the elastomer 2 and the eddy current sensor 5 decreases. The thinner the cotton strip, the smaller the bending of the beam, that is, the distance between the elastomer 2 and the eddy current sensor 5 increases. The voltage signal output by the eddy current sensor increases or decreases with the thickness of the cotton strip.

[0009] Reference Figure 3 When the cotton strip passes through the channel, it squeezes the elastic body 2, causing the elastic body 2 to bend and deform. The strain gauge 3 installed on the beam deforms and outputs a voltage signal. The installed eddy current sensor 5 detects the change in the distance between the elastic body 2 and the eddy current sensor 5 and outputs a proportional voltage signal.

[0010] Reference Figure 4 The strain signal and displacement signal generated by the sliver squeezing the elastic body are introduced into the preamplifier and then converted by AD. The ECU processes and outputs them to the subsequent control unit for use.

Claims

1. Sliver quality detection device, features include: A sliver collecting bell (1) A double beam structure sliver guide elastic body (2) Strain gauges installed on the elastic beam of the double beam structure (3) A preamplifier (4) to amplify the signal A non-contact displacement detection sensor, an eddy current sensor (5), is used to detect displacement changes of an elastic body caused by changes in the mass of a sliver.

2. The sliver quality detection device according to claim 1, characterized in that: The cotton collecting bell mouth (1) and the cotton guiding elastic body (2) with a double beam structure together form a passage for cotton strips and other fiber strips (8) to pass through, and the cotton guiding elastic body (2) with a double beam structure comprises a guide strip gauge (7) and a steel sheet (6).

3. The sliver quality detection device according to claim 1 and claim 2, characterized in that: The strain gauges (3) installed on the beams of the double-beam structure elastic body (2) form a Wheatstone bridge to detect the bending deformation of the elastic body squeezed by the cotton strip (8).

4. The sliver quality detection device according to claim 1 and claim 2, characterized in that: There are two ways to detect the displacement of the double-beam structure cotton-guiding elastic body (2) squeezed by the cotton strip (8) using the non-contact displacement detection eddy current sensor (5). One is the eddy current sensor end face area measurement method (5-1); the other is the eddy current sensor detection of the distance change between the elastic body (2) and the eddy current sensor (5) (5-2).

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