Control system and control method for uniform torsion forming of optical fiber image inverter

Abstract

The invention relates to a control system and method for uniform torsion forming of an optical fiber image inverter, and the system comprises an obtaining unit which is used for obtaining the rotation speed of a driving shaft and the resistance torque of a driven shaft in real time; the storage unit is used for storing the rotation speed and the resistance torque acquired by the torsion forming control unit; the comparison unit is used for comparing the rotation speed stored by the storage unit with the set rotation speed of the driving shaft and comparing the resistance torque stored by the storage unit with the set resistance torque of the driven shaft; and the control unit is used for controlling the torsion forming device of the optical fiber image inverter to perform torsion forming of the optical fiber image inverter by adopting corresponding measures in a uniform torsion forming manner according to a comparison result, so as to ensure that the tensile deformation uniformity of the fiber of the optical fiber image inverter is ensured in a constant stress manner all the time. By adopting the control system and the control method provided by the invention, the imaging definition, the edge transmittance, the edge resolution and other performances of the optical fiber image inverter can be improved.

Description

Technical Field

[0001] The present invention relates to the field of manufacturing fiber optic image inverters, and particularly to a method and control system for uniformly twisting and forming a fiber optic image inverter. Background Art

[0002] The image transmission mechanism of a fiber optic image inverter is realized by using the total reflection principle of optical fibers. The optical fibers that make up the fiber optic image inverter are prepared by hot melt pressing using a rod-tube combination and vacuum drawing process from a low-refractive-index skin glass tube, a high-refractive-index core glass rod, and a light-absorbing glass filament. Since the optical fibers are completely fused together tightly by the skin material glass, the adjacent optical fibers are close to each other, resulting in light crosstalk between adjacent fibers. For example, uneven deformation of the wall thickness of the skin glass tube may be caused by an uneven temperature field or uneven stress during the twisting and forming process, resulting in light penetration during the total reflection process of the input light, causing light leakage. This leaked light entering adjacent fibers will also cause light crosstalk, directly affecting the resolution, contrast, and imaging quality clarity of the fiber optic image inverter.

[0003] Since the optical fibers in the fiber optic image inverter need to rotate 180° around the axis center during the twisting and forming process, for a fiber optic image inverter prepared from three different glass materials, the control of the twisting time during the twisting and forming process is ultimately achieved by controlling the fiber stretching deformation through the twisting temperature. Because glass has viscoelasticity at high temperatures, the viscosity will decrease after a long time at high temperatures, accelerating the twisting and forming speed of the fiber optic image inverter. When the twisting time is short and the twisting and forming speed is too fast, the fiber drawing deformation is fast; conversely, the deformation is slow. During the twisting process, the fiber stretching deformation is always in this continuous adjustment state. For a fiber optic image inverter composed of three different materials, it is difficult to achieve consistency in the stretching deformation speed and the twisting torque received by the internal optical fibers during the twisting and forming process, resulting in difficulty in controlling the uniformity of fiber deformation during twisting and forming, and unable to achieve high-uniform deformation of the internal optical fibers of the fiber optic image inverter.

[0004] During the actual twisting process of an optical fiber image inverter, many factors can affect the twisting and forming process of the optical fiber image inverter. For example, when the rotation speed is too fast, there is inertia during the twisting of the optical fiber image inverter, which will cause "overshoot" in the fiber deformation. Or by adjusting and controlling the stability of the twisting temperature, it will directly affect the stability of the fiber deformation during the twisting and forming process. In the traditional preparation technology of optical fiber image inverters, the twisting and forming rely on mechanical gravity twisting or rotation driven by a motor. In the high-temperature state, the fibers in the central region are preferentially softened and deformed, but inevitably, a stress center will be generated, causing the optical fibers in the intermediate heating region to be stretched and deformed into a double-cone shape, resulting in uneven stretching and deformation of the optical fibers. However, for some optical fiber image inverters with special requirements, such as optical fiber image inverters with ultra-short twisted wire regions, it is required to shorten the twisted deformation region as much as possible. This requires the stretching and deformation of the optical fibers in the twisted deformation region of the optical fiber image inverter to be uniform. Otherwise, a series of problems affecting the quality of the optical fiber image inverter will occur, such as spot defects, reduced edge resolution, and reduced edge transmittance. The existing twisting and forming technology of optical fiber image inverters has high requirements for the operator's level and strong dependence on the operator's technical proficiency. It cannot achieve uniform twisting and forming of optical fiber image inverters, especially optical fiber image inverters with ultra-short twisted wire regions, and the consistency of production quality cannot be guaranteed. Summary of the Invention

[0005] The main object of the present invention is to provide a method for uniformly twisting and forming an optical fiber image inverter that can improve the imaging clarity, edge transmittance, and edge resolution of the optical fiber image inverter.

[0006] To achieve the above object, the technical solution adopted by the present invention is as follows:

[0007] A control system for uniformly twisting and forming an optical fiber image inverter, comprising:

[0008] An acquisition unit for real-time acquiring the rotation speed of the driving shaft and the resistance torque of the driven shaft;

[0009] A storage unit for storing the rotation speed of the driving shaft and the resistance torque of the driven shaft acquired by the acquisition unit;

[0010] A comparison unit for comparing the rotation speed stored in the storage unit with the set rotation speed of the driving shaft, and comparing the resistance torque stored in the storage unit with the set resistance torque of the driven shaft;

[0011] A control unit, according to the comparison result, controls the twisting and forming device of the optical fiber image inverter to adopt corresponding measures to twist and form the optical fiber image inverter in a uniform twisting and forming manner, so as to ensure that the fibers of the optical fiber image inverter are always in a constant stress mode to ensure the uniformity of fiber stretching and deformation.

[0012] The control unit includes a drive motor, which drives the torsion bar of the driving shaft to rotate through a belt or a chain, and the rotation speed of the driving shaft is transmitted to the optical fiber image inverter blank workpiece through the torsion bar;

[0013] The resistance torque is transmitted from the arrester to the optical fiber image inverter blank workpiece through the torsion bar of the driven shaft, and is used to control the driving shaft and the driven shaft to achieve inconsistent rotation speeds;

[0014] The set rotation speed of the driving shaft refers to the rotation speed when the motor reduction ratio is the first preset value during the torsion forming of the optical fiber image inverter blank workpiece;

[0015] The set resistance torque of the driven shaft refers to the resistance torque in the state where the second preset value is the torsion forming time when the optical fiber image inverter blank workpiece is twisted to an angle of 180°;

[0016] The first preset value is (25-40):1.

[0017] The second preset value is 8-10 minutes.

[0018] The present invention also provides a control method for uniform torsion forming of an optical fiber image inverter, including the following steps:

[0019] (1) Real-time obtain the rotation speed of the driving shaft and the resistance torque of the driven shaft of the optical fiber image inverter torsion forming device;

[0020] (2) Store the obtained rotation speed of the driving shaft and the resistance torque of the driven shaft;

[0021] (3) Compare the stored rotation speed of the driving shaft with the set rotation speed of the driving shaft, and compare the stored resistance torque with the set resistance torque of the driven shaft;

[0022] (4) Control the corresponding rotation mode during the torsion forming of the optical fiber image inverter to rotate in a constant force manner according to the comparison result.

[0023] The comparison results include:

[0024] When the rotation speed of the driving shaft obtained and stored in real time is greater than the set rotation speed of the driving shaft, the drive motor reduces the operating speed, so that the torsion bar of the driving shaft reduces the torsion speed, and keeps the rotation speed of the driving shaft equal to the set rotation speed of the driving shaft;

[0025] When the rotation speed of the driving shaft obtained and stored in real time is less than the set rotation speed of the driving shaft, the drive motor accelerates the operation, so that the torsion bar of the driving shaft increases the torsion speed, and keeps the rotation speed of the driving shaft equal to the set rotation speed of the driving shaft;

[0026] When the resistance torque obtained and stored in real time is greater than the resistance torque of the set passive shaft, reduce the resistance torque of the resistor so that the obtained resistance torque is equal to the resistance torque of the set passive shaft;

[0027] When the resistance torque obtained and stored in real time is less than the resistance torque of the set passive shaft, increase the resistance torque of the resistor so that the obtained resistance torque is equal to the resistance torque of the set passive shaft.

[0028] The set rotational speed of the active shaft is 200 - 300 revolutions / min;

[0029] The set resistance torque of the passive shaft is 1.5 - 2.0 N·m.

[0030] By means of the above technical solutions, the present invention has at least the following advantages:

[0031] In order to solve the problems existing in the prior art such as uneven stretching deformation during the torsional forming of optical fibers inside an optical fiber image inverter, and to improve the performance such as imaging clarity, edge transmittance, and edge resolution of the optical fiber image inverter, the present invention provides a control method and control system for uniform torsional forming of an optical fiber image inverter. When encountering a slower or faster torsional speed, it can accurately control the torsional forming speed of the optical fiber image inverter in a timely manner, thereby accurately controlling the uniform stretching of the stretching deformation of the fibers of the optical fiber image inverter, and realizing uniform stretching of the fiber stretching deformation of the optical fiber image inverter during the torsional forming process under any working conditions.

[0032] During the torsional forming process of the optical fiber image inverter of the present invention, according to the comparison result of the obtained rotational torsional speed of the active shaft and the resistance torque of the passive shaft with the pre-determined rotational speed of the active shaft and the set resistance torque of the passive shaft, corresponding measures can be taken to control the torsional forming process of the optical fiber image inverter in a uniform torsional forming manner, so as to ensure the uniformity and consistency of the stretching deformation of the optical fibers during the torsional forming process of the optical fiber image inverter, thereby improving the performance such as image transmission clarity, edge transmittance, and edge resolution of the optical fiber image inverter.

[0033] The above description is only an overview of the technical solution of the present invention. In order to be able to more clearly understand the technical means of the present invention and implement it in accordance with the content of the specification, the following provides a detailed description of the preferred embodiments of the present invention as follows. Detailed implementation manners

[0034] To further elaborate on the technical means and effects adopted by the present invention to achieve the intended invention purpose, the following, in conjunction with preferred embodiments, details the specific implementation manner, structure, features, and effects of the present invention as follows. In the following description, different "one embodiment" or "embodiments" do not necessarily refer to the same embodiment. In addition, the specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0035] A control system for uniform torsion forming of an optical fiber image inverter, comprising:

[0036] An acquisition unit for real-time acquisition of the rotational speed of the driving shaft and the resistance torque of the driven shaft;

[0037] A storage unit for storing the rotational speed of the driving shaft and the resistance torque of the driven shaft acquired by the acquisition unit;

[0038] A comparison unit for comparing the rotational speed stored in the storage unit with the set rotational speed of the driving shaft, and comparing the resistance torque stored in the storage unit with the set resistance torque of the driven shaft;

[0039] A control unit, according to the comparison result, controls the torsion forming device of the optical fiber image inverter to adopt corresponding measures to perform the torsion forming of the optical fiber image inverter in a uniform torsion forming manner, so as to ensure that the fibers of the optical fiber image inverter are always under a constant stress manner to ensure the uniformity of fiber tensile deformation.

[0040] Further, the control unit includes a driving motor, and the driving motor drives the torsion rod of the driving shaft to rotate through a belt or a chain, and the rotational speed of the driving shaft is transmitted to the workpiece of the optical fiber image inverter blank through the torsion rod;

[0041] The resistance torque is transmitted from the resistance device to the workpiece of the optical fiber image inverter blank through the torsion rod of the driven shaft, and is used to control the inconsistent rotational speeds of the driving shaft and the driven shaft;

[0042] The set rotational speed of the driving shaft refers to the rotational speed when the motor reduction ratio is the first preset value during the torsion forming of the workpiece of the optical fiber image inverter blank;

[0043] The set resistance torque of the driven shaft refers to the resistance torque in the state where the time for torsion forming is the second preset value when the workpiece of the optical fiber image inverter blank is twisted by 180°.

[0044] The first preset value is (25 - 40):1.

[0045] The second preset value is 8 - 10 minutes.

[0046] By adopting the control system of the present invention, the uniformity of the tensile deformation of the optical fiber during the torsional forming process of the fiber optic image inverter can be ensured. Moreover, by rotating and twisting in a constant force manner, the consistency of the fiber deformation during the torsional forming process can be guaranteed, ultimately improving the performance such as the imaging clarity, edge transmittance, and edge resolution of the fiber optic image inverter.

[0047] The present invention will be further described below through specific control methods: Embodiment 1

[0048] A control method for uniform torsional forming of a fiber optic image inverter includes the following steps:

[0049] (1) Obtain the rotation speed of the driving shaft and the resistance torque of the driven shaft of the torsional forming device of the fiber optic image inverter in real time;

[0050] (2) Store the obtained rotation speed of the driving shaft and the resistance torque of the driven shaft;

[0051] (3) Compare the stored rotation speed of the driving shaft with the set rotation speed of the driving shaft, and compare the stored resistance torque with the set resistance torque of the driven shaft;

[0052] (4) According to the comparison results, control the rotation mode adopted during the torsional forming of the fiber optic image inverter in real time to rotate in a constant force manner. The specific comparison results and control methods are as follows:

[0053] When the set rotation speed of the driving shaft is at a motor reduction ratio of 25:1, the rotation speed of the driving shaft is 250 revolutions per minute;

[0054] The set resistance torque of the driven shaft is 1.8 N·m, which is the resistance torque under the condition that the torsional forming time is 8 minutes.

[0055] When the rotation speed of the driving shaft obtained and stored in real time is greater than 250 revolutions per minute, drive the motor to reduce the operating speed, so that the torsion rod of the driving shaft reduces the torsion speed and keeps the rotation speed of the driving shaft equal to 250 revolutions per minute;

[0056] When the rotation speed of the driving shaft obtained and stored in real time is less than 250 revolutions per minute, drive the motor to accelerate the operation, so that the torsion rod of the driving shaft increases the torsion speed and keeps the rotation speed of the driving shaft equal to 250 revolutions per minute;

[0057] When the resistance torque obtained and stored in real time is greater than 1.8 N·m, reduce the resistance torque of the resistor so that the obtained resistance torque is equal to 1.8 N·m;

[0058] When the resistance torque obtained and stored in real time is less than 1.8 N·m, increase the resistance torque of the resistor so that the obtained resistance torque is equal to 1.8 N·m.

[0059] Example 2

[0060] A control method for uniform torsion forming of an optical fiber image inverter, comprising the following steps:

[0061] (1) Obtain the rotation speed of the driving shaft and the resistance torque of the driven shaft of the torsion forming device of the optical fiber image inverter in real time;

[0062] (2) Store the obtained rotation speed of the driving shaft and the resistance torque of the driven shaft;

[0063] (3) Compare the stored rotation speed of the driving shaft with the set rotation speed of the driving shaft, and compare the stored resistance torque with the set resistance torque of the driven shaft;

[0064] (4) According to the comparison results, control the rotation mode adopted during the torsion forming of the optical fiber image inverter in real time to rotate in a constant force manner. The specific comparison results and control methods are as follows:

[0065] When the set rotation speed of the driving shaft is at a motor reduction ratio of 25:1, the rotation speed of the driving shaft is 200 revolutions per minute;

[0066] The set resistance torque of the driven shaft is 1.5 N·m, which is the resistance torque under the condition that the torsion forming time is 9 minutes.

[0067] When the rotation speed of the driving shaft obtained and stored in real time is greater than 200 revolutions per minute, drive the motor to reduce the operating speed, so that the torsion rod of the driving shaft reduces the torsion speed and keeps the rotation speed of the driving shaft equal to 200 revolutions per minute;

[0068] When the rotation speed of the driving shaft obtained and stored in real time is less than 200 revolutions per minute, drive the motor to accelerate, so that the torsion rod of the driving shaft increases the torsion speed and keeps the rotation speed of the driving shaft equal to 200 revolutions per minute;

[0069] When the resistance torque obtained and stored in real time is greater than 1.5 N·m, reduce the resistance torque of the resistor to make the obtained resistance torque equal to 1.5 N·m;

[0070] When the resistance torque obtained and stored in real time is less than 1.5 N·m, increase the resistance torque of the resistor to make the obtained resistance torque equal to 1.5 N·m.

[0071] Example 3

[0072] A control method for uniform torsion forming of an optical fiber image inverter, comprising the following steps:

[0073] (1) Obtain the rotation speed of the driving shaft and the resistance torque of the driven shaft of the torsion forming device of the optical fiber image inverter in real time;

[0074] (2) Store the rotational speed of the driving shaft and the resistance torque of the driven shaft obtained.

[0075] (3) Compare the stored rotational speed of the driving shaft with the set rotational speed of the driving shaft, and compare the stored resistance torque with the set resistance torque of the driven shaft.

[0076] (3) According to the comparison results, control the corresponding rotation mode in real time when the fiber optic image inverter is twisted and formed to rotate in a constant force manner. The specific comparison results and control methods are as follows:

[0077] When the set rotational speed of the driving shaft is at a motor reduction ratio of 40:1, the rotational speed of the driving shaft is 300 revolutions per minute.

[0078] The set resistance torque of the driven shaft is 2.0 N·m, which is the resistance torque in the state where the twisting and forming time is 10 minutes.

[0079] When the rotation speed of the driving shaft obtained and stored in real time is greater than 300 revolutions per minute, drive the motor to reduce the operating speed, so that the torsion bar of the driving shaft reduces the torsion speed and keeps the rotation speed of the driving shaft equal to 300 revolutions per minute.

[0080] When the rotation speed of the driving shaft obtained and stored in real time is less than 300 revolutions per minute, drive the motor to accelerate, so that the torsion bar of the driving shaft increases the torsion speed and keeps the rotation speed of the driving shaft equal to 300 revolutions per minute.

[0081] When the resistance torque obtained and stored in real time is greater than 2.0 N·m, reduce the resistance torque of the resistor to make the obtained resistance torque equal to 2.0 N·m.

[0082] When the resistance torque obtained and stored in real time is less than 2.0 N·m, increase the resistance torque of the resistor to make the obtained resistance torque equal to 2.0 N·m.

[0083] The following table shows the comparison results of the performance of the fiber optic image inverters prepared in each embodiment and the fiber optic image inverters prepared in the comparative example without using the control method of the present invention:

[0084]

[0085]

[0086] By adopting the control method of the present invention, the uniformity of fiber deformation of the fiber image inverter and the uniform torsion forming of the torsion wire area can be ensured, thereby improving the image transmission clarity, edge transmittance, edge resolution and other performances of the fiber image inverter. Among them, the motor rotation mode is the mode of generating torsion through the rotation of the motor; the resistor can act on the torsion forming device, and the rotation speed is adjusted by generating resistance through the indirect friction force between the torsion rod and the resistor.

[0087] A control method and control system for uniform torsion forming of a fiber image inverter provided by the present invention can effectively improve the imaging contrast and clarity of the fiber image inverter by optimizing the preparation technology and applying it in the preparation process of the fiber image inverter. Especially for the preparation of a fiber image inverter with an ultra-short torsion wire area, the prepared fiber image inverter has the advantages of high resolution, high contrast, high transmittance and high uniformity, further improving the product performance.

[0088] The above are only the preferred embodiments of the present invention and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the equivalent embodiments by using the above-disclosed technical content without departing from the technical solution of the present invention. However, as long as it does not depart from the technical solution of the present invention, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A control system for uniform twisting of an optical fiber image invertor, characterized in that: include: An acquisition unit, used for acquiring the rotation speed of the active shaft and the resistance torque of the passive shaft in real time; A storage unit, used for storing the rotation speed of the driving shaft and the resistance torque of the passive shaft acquired by the acquisition unit; A comparison unit, used to compare the rotation speed stored in the storage unit with the set rotation speed of the driving shaft, and to compare the resistance torque stored in the storage unit with the set resistance torque of the passive shaft; The control unit controls the optical fiber image inverter torsion molding device to adopt corresponding measures to perform torsion molding of the optical fiber image inverter in a uniform torsion molding manner according to the comparison result, so as to ensure that the fiber of the optical fiber image inverter is always subjected to a constant force to ensure the uniformity of the fiber tensile deformation.

2. The control system according to claim 1, characterized in that: The control unit includes a driving motor, which drives the torsion rod of the driving shaft to rotate through a belt or a chain, and the rotation speed of the driving shaft is transmitted to the fiber optic image invertor blank workpiece through the torsion rod; The resistance torque is transmitted to the fiber image invertor blank workpiece by the resistance device through the torsion rod of the passive shaft, and is used to control the active shaft and the passive shaft to achieve the inconsistency of the rotation speed; The set rotation speed of the driving shaft refers to the rotation speed when the motor reduction ratio is the first preset value when the fiber image invertor blank workpiece is twisted and formed; The set resistance torque of the passive axis refers to the resistance torque when the fiber image invertor blank workpiece is twisted to an angle of 180° and the twisting forming time is in a state of a second preset value.

3. The control system according to claim 1 or 2, characterized in that: The first preset value is (25-40):

1.

4. The control system according to claim 3, characterized in that: The second preset value is 8-10 minutes.

5. A control method for uniform twisting of an optical fiber image invertor, characterized in that: The following steps are involved: (1) Real-time acquisition of the rotation speed of the active shaft and the resistance torque of the passive shaft of the optical fiber image invertor torsion shaping device; (2) storing the obtained rotation speed of the driving shaft and the resistance torque of the passive shaft; (3) comparing the stored rotation speed of the driving shaft with the set rotation speed of the driving shaft, and comparing the stored resistance torque with the set resistance torque of the passive shaft; (4) According to the comparison result, the fiber optic image inverter is controlled to rotate in a corresponding manner under a constant force when twisting and forming.

6. The control method according to claim 5, characterized in that: The comparison results include: When the rotation speed of the driving shaft acquired and stored in real time is greater than the set rotation speed of the driving shaft, the driving motor is driven to reduce the running speed, so that the torsion rod of the driving shaft reduces the torsion speed, and the rotation speed of the driving shaft is kept equal to the set rotation speed of the driving shaft; When the rotation speed of the driving shaft acquired and stored in real time is less than the set rotation speed of the driving shaft, the driving motor is accelerated to increase the torsion speed of the torsion rod of the driving shaft, so as to keep the rotation speed of the driving shaft equal to the set rotation speed of the driving shaft; When the resistance torque acquired and stored in real time is greater than the set resistance torque of the passive shaft, the resistance torque of the resistor is reduced so that the acquired resistance torque is equal to the set resistance torque of the passive shaft; When the resistance torque acquired and stored in real time is less than the set resistance torque of the passive shaft, the resistance torque of the resistor is increased so that the acquired resistance torque is equal to the set resistance torque of the passive shaft.

7. The control method according to claim 6, characterized in that: The set driving shaft rotation speed is 200-300 rpm.

8. The control method according to claim 6 or 7, characterized in that: The set resistance torque of the passive shaft is 1.5-2.0Nm.

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