A calibration device, a calibration method thereof and an optical fiber preform device having the same

Abstract

The present invention discloses a calibration device, a calibration method thereof and an optical fiber preform rod equipment having the same. The calibration device includes a lead screw, a calibration platform, a laser emitter, a confirmation plate and a camera. The calibration platform is slidably arranged on the lead screw, and the lower surface of the calibration platform is perpendicular to the lead screw; the laser emitter emits a laser perpendicular to the horizontal plane; the confirmation plate is arranged on the lower surface of the calibration platform facing the laser emitter, and the light spot of the laser emitter is irradiated to the confirmation plate; the camera is arranged on the lower surface to shoot the light spot image of the confirmation plate; wherein the camera shoots the light spot images of the confirmation plate at two positions respectively, compares the two light spot images to obtain the offset distance of the light spot centers of the two, and judges the inclination direction of the lead screw to adjust the lead screw perpendicular to the horizontal plane. The calibration device of the present invention can reduce the complexity of the operation under the premise of meeting the high precision requirements during the vertical lead screw adjustment process.

Description

Technical Field

[0001] The present invention relates to a calibration device, a calibration method thereof and an optical fiber preform equipment having the same, and in particular to a high-precision, low-error calibration device, a calibration method thereof and an optical fiber preform equipment having the same. Background Art

[0002] For optical fiber preform manufacturing equipment, equipment for preparing optical fiber by axial vapor deposition (VAD method), optical fiber core rod stretching equipment, optical fiber preform sintering equipment, optical fiber preform degassing annealing equipment, etc. all need to perform vertical feeding or lifting operations. Since the vertical feeding direction of optical fiber preform equipment will be affected by gravity, if there is a large deviation between the vertical feeding or lifting direction and the gravity direction, it is very easy to cause product quality problems, and it is difficult to find and confirm the problem.

[0003] The most common method for vertical screw calibration is the plumb line method, which involves dropping a plumb line with a heavy weight at the bottom on the platform, selecting a reference surface on the device and measuring the positions of the two points above and below the plumb line to confirm whether the device is parallel to the plumb line, thereby confirming the verticality of the device. Alternatively, a reference point not associated with the device is used, and the upper and lower positions of the platform during the screw movement are selected, and the distance from the plumb line to the reference point is measured after the plumb line is hung to determine the verticality of the device.

[0004] However, 1) both methods require the placement of a vertical line. The first method requires measurement at two positions, upper and lower. If the equipment is high, the measurement is difficult. The second method requires laying out the line twice, which introduces a large operating error for optical fiber preform equipment with high precision requirements, and is not suitable as a calibration method.

[0005] 2) Both of the above methods require personnel to go to the reference point to measure the position, which will introduce large measurement errors and is not ideal for optical fiber preform equipment.

[0006] Therefore, it is necessary to propose a calibration device with high precision, low error and convenient precise adjustment. Summary of the invention

[0007] The purpose of the present invention is to improve the problem of large verticality calibration error.

[0008] To achieve one of the above-mentioned purposes of the invention, an embodiment of the present invention provides a calibration device for vertical calibration of an optical fiber preform device.

[0009] The calibration device includes: a screw having a first position and a second position; a calibration platform slidably disposed on the screw, the lower surface of the calibration platform being perpendicular to the screw; a laser emitter disposed below the calibration platform, the laser emitter emitting laser light perpendicular to a horizontal plane; a confirmation plate disposed on the lower surface and facing the laser emitter, the light spot of the laser emitter irradiating the confirmation plate; and a camera disposed on the lower surface to capture a light spot image of the confirmation plate; wherein the camera captures the light spot images of the calibration platform at the first position and the second position respectively, and judges the inclination direction of the screw according to the light spot offset of the two light spot images and adjusts the screw to be perpendicular to the horizontal plane.

[0010] Preferably, the laser transmitter has a level bubble and a support foot, the support foot is adjusted horizontally according to the level bubble, and the laser emitted by the laser transmitter is perpendicular to the horizontal plane indicated by the level bubble.

[0011] Preferably, the sensing accuracy of the horizontal bubble is higher than the debugging verticality requirement of the vertical screw.

[0012] Preferably, the lead screw and the calibration platform are integrated into the optical fiber preform equipment.

[0013] Furthermore, when the calibration platform is located at the first position, the position of the laser emitter and the horizontality of the laser emitter are adjusted until the laser spot emitted by the laser emitter is irradiated on the center of the confirmation plate and at the same time the horizontality of the laser emitter is within the accuracy requirement, and the camera captures the spot image of the calibration platform at the first position.

[0014] Furthermore, when the calibration platform is located at the second position, the camera captures the light spot image of the calibration platform at the second position, and compares the light spot image at the second position with the light spot image at the first position, so as to determine the inclination direction of the screw rod and adjust the screw rod.

[0015] Further, the calibration platform is moved to the first position again, the light spot image at the first position is captured, the light spot image at the second position is compared with the light spot image at the first position, and the offset of the light spot is confirmed. If the offset of the light spot is within a preset range, the calibration of the lead screw is stopped; if the offset of the light spot is outside the preset range, the calibration of the lead screw continues.

[0016] Preferably, a cross-shaped vertical coordinate is drawn on the confirmation plate, and the cross-shaped vertical coordinate has an offset scale.

[0017] Preferably, the light spot of the light spot image at the first position is located at the center of the cross-shaped vertical coordinate.

[0018] Preferably, the height difference between the first position and the second position is greater than or equal to 1 meter.

[0019] Preferably, the calibration device further comprises a display device, and the display device is communicatively connected to the camera, and the camera transmits the light spot image to the display device in real time.

[0020] The present invention also provides a calibration method for the calibration device as described above, the calibration method comprising: step S1: installing the confirmation plate and the camera on the lower table surface of the calibration platform, the camera being able to photograph the front of the confirmation plate; step S2: moving the calibration platform to the first position; step S3: placing the laser emitter under the calibration platform aligned with the confirmation plate position; step S4: adjusting the position of the laser emitter and the horizontality of the laser emitter until the laser spot emitted by the laser emitter is irradiated on the center of the confirmation plate, and at the same time the horizontality of the laser emitter is within the accuracy requirement, and the camera photographs the spot image at the first position; step S5: moving the calibration platform from the first position to the second position, and the camera photographs the spot image at the second position; step S6: comparing the two spot images, judging the inclination direction of the lead screw according to the offset of the spot, and adjusting the lead screw accordingly.

[0021] Furthermore, after step S6, step S7 is also included: repeat steps S2 to S5, if the offset distance of the light spot in the two light spot images is within the preset range, the vertical calibration of the screw rod is completed; if the offset distance of the light spot in the two light spot images is outside the preset range, continue to repeat steps S2 to S7 until the offset distance of the light spot at the first position and the light spot at the second position is within the preset range.

[0022] The present invention also provides an optical fiber preform equipment, comprising any one of the calibration devices described above.

[0023] Compared with the prior art, the calibration device of the present invention can reduce the complexity of the operation while meeting the high precision requirements during the vertical screw adjustment process. It is not necessary to place the vertical line, thus avoiding the possibility of introducing errors during the placement of the vertical line. It also avoids the operation of the calibrator to measure and confirm multiple times, thus simplifying the operational difficulty of the entire calibration and the errors caused by human measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic diagram of a calibration device of the present invention;

[0025] Figure 2 yes Figure 1 A schematic diagram of a confirmation plate in a calibration device;

[0026] Figure 3 yes Figure 1 Schematic diagram of the laser transmitter in the calibration device;

[0027] Figure 4 yes Figure 1 Schematic diagram of the calibration device in the state of waiting for calibration. DETAILED DESCRIPTION

[0028] In order to make the purpose, technical solutions and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below in combination with the specific implementation methods of this application and the corresponding drawings. Obviously, the described implementation methods are only part of the implementation methods of this application, not all of the implementation methods. Based on the implementation methods in this application, all other implementation methods obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0030] For ease of explanation, this document uses terms that represent relative positions in space for description, such as "above", "below", "back", "front", etc., to describe the relationship of one unit or feature shown in the drawings relative to another unit or feature. Terms of relative positions in space can include different orientations of the device in use or operation other than the orientation shown in the figure. For example, if the device in the figure is turned over, the unit described as being "below" or "above" other units or features will be located "below" or "above" the other units or features. Therefore, the exemplary term "below" can encompass both the spatial orientations of below and above.

[0031] Figure 1 is a schematic diagram of a calibration device of the present invention, Figure 2 yes Figure 1 Schematic diagram of the confirmation board in the calibration device, Figure 3 yes Figure 1 Schematic diagram of the laser transmitter in the calibration device. Figure 4 yes Figure 1 Please refer to the schematic diagram of the calibration device in the state of waiting for calibration. Figures 1 to 4 .

[0032] The present invention provides a calibration device 1 for a vertical lead screw 10 of an optical fiber preform device. The calibration device 1 comprises the lead screw 10, a calibration platform 2, a laser transmitter 3, a confirmation plate 4, and a camera 5.

[0033] The calibration platform 2 is slidably disposed on the screw rod 10, and the lower surface of the calibration platform 2 is perpendicular to the screw rod 10. The laser emitter 3 is disposed below the calibration platform 2, and the laser emitter 3 emits laser light perpendicular to the horizontal plane, that is, the laser light emitted by the laser emitter 3 is, for example, in the opposite direction of gravity. The confirmation plate 4 is disposed on the lower surface of the calibration platform 2 facing the laser emitter 3, and the light spot of the laser emitter 3 is irradiated to the confirmation plate 4. The camera 5 is disposed on the lower surface to capture the light spot image of the confirmation plate 4, and is disposed on the lower surface, and can be directly disposed or indirectly disposed through the confirmation plate 4.

[0034] Among them, the camera 5 respectively captures the spot images of the calibration platform 2 at two positions, compares the two spot images to obtain the offset distance of the two spots, judges the inclination direction of the screw rod to adjust the screw rod perpendicular to the horizontal plane, and further calculates the inclination of the screw rod 10, and accurately adjusts the screw rod to make it perpendicular to the horizontal plane.

[0035] The following describes the adjustment method in detail. Figure 4 As shown, if the light spot is offset, the screw rod 10 is adjusted in the opposite direction of the offset direction of the light spot, so that the light spot position of the laser on the confirmation plate 4 moves toward the center and finally stops at the center position of the confirmation plate 4. In this embodiment, the adjustment angle can also be calculated, and the calculation method is as follows, for example Figure 4 As shown, the calibration platform 2 slides on the screw 10, the distance H between the two positions can be measured or set, and the offset distance D of the spot centers of the two positions can be known from the spot image, so the inclination of the screw 10 can be known by using trigonometric functions. Of course, in other embodiments, this inclination may not be calculated, and instead, the debugging requirements can be met by adjusting the screw multiple times.

[0036] In this way, the complexity of the operation can be reduced while meeting the high precision requirements during the vertical screw adjustment process. There is no need to place the vertical line, avoiding the possibility of introducing errors during the placement of the vertical line. At the same time, it avoids the operation of the calibrator measuring and confirming up and down many times, simplifying the difficulty of the entire calibration operation and the errors caused by human measurement.

[0037] To ensure that the laser emitted by the laser emitter 3 is perpendicular to the horizontal plane, in this embodiment, the laser emitter 3 has a horizontal bubble 31, a support foot 32 and a laser emitting hole 33. The sensing accuracy of the horizontal bubble 31 is higher than the verticality requirement of the debugging of the vertical screw 10. The support foot 32 is adjusted horizontally according to the horizontal bubble 31. The laser emitted by the laser emitter 3 is perpendicular to the horizontal plane indicated by the horizontal bubble 31, that is, the laser emitted by the laser emitter 3 is always in the opposite direction of gravity, which is equivalent to playing the role of a vertical line.

[0038] In this embodiment, the screw rod 10 and the calibration platform 2 can be integrated into the optical fiber preform equipment, that is, the calibration is performed using the inherent elements of the optical fiber preform equipment. For example, the screw rod and the screw rod platform in the drawing equipment are used as the screw rod 10 and the calibration platform 2 of the calibration device.

[0039] Specifically, the two positions include, for example, a first position P1 and a second position P2 (high position or low position), and the height difference between the first position P1 and the second position P2 is greater than or equal to 1 meter. Figure 4 As shown, the position of the laser emitter 3 is adjusted so that the laser spot of the laser emitter 3 is projected on the center of the confirmation plate 4. The camera 5 then captures the spot image on the confirmation plate 4 at the second position P2, compares the spot images at the first position P1 and the second position P2, and adjusts the lead screw 10 accordingly according to the offset of the two spots.

[0040] After confirming the inclination of the screw rod 10, adjust the screw rod 10, move the calibration platform 2 to the first position P1 again, and take the light spot image on the confirmation plate 4, compare the light spot images at the first position P1 and the second position P2, and confirm the offset of the light spot. If the offset of the light spot is within the debugging requirements, stop the calibration; if the offset of the light spot is not within the debugging requirements, continue the calibration.

[0041] To more intuitively display the offset D of the light spot center and the inclination of the screw rod 10, as shown in FIG. Figure 2 As shown, the confirmation plate 4 is drawn with a vertical coordinate in a cross-shaped manner. Furthermore, the vertical coordinate in a cross-shaped manner not only marks the offset D, but also carries the inclination of the lead screw represented by the offset. For example, the setting value under the debugging requirement is the innermost scale frame of the cross-shaped vertical coordinate, that is, if the laser emitted by the laser emitter 3 is always in the innermost scale frame at different positions, it is determined that the lead screw 10 has completed the calibration.

[0042] The calibration device also includes a display device (not shown), which can be communicatively connected to the camera 5, and the camera 5 transmits the light spot image to the display device in real time. In this way, personnel can watch the light spot image displayed on the display device in real time during calibration, and judge the inclination direction of the screw rod according to the position relationship between the light spot and the scale line in the real-time light spot image, so as to better and more intuitively adjust the screw rod to make it perpendicular to the horizontal plane.

[0043] The following is a detailed description of the vertical calibration method of the optical fiber preform equipment, including:

[0044] Step S1: installing the confirmation plate and the camera on the lower surface of the calibration platform, wherein the camera can capture the front of the confirmation plate;

[0045] Step S2: moving the calibration platform to the first position;

[0046] Step S3: placing the laser transmitter under the calibration platform aligned with the confirmation plate;

[0047] Step S4: adjusting the position of the laser emitter and the level of the laser emitter until the laser spot emitted by the laser emitter is irradiated on the center of the confirmation plate and the level of the laser emitter is within the accuracy requirement, and the camera captures the spot image at the first position;

[0048] Step S5: moving the calibration platform from the first position to the second position, and capturing a light spot image at the second position by the camera;

[0049] Step S6: Compare the two light spot images, determine the tilt direction of the lead screw according to the offset of the light spot, and adjust the lead screw accordingly.

[0050] After step S6, step S7 is also included: repeat steps S2 to S5. If the offset distance of the light spot in the two light spot images is within the preset range, the calibration of the lead screw is completed; if the offset distance of the light spot in the two light spot images is outside the preset range, continue to repeat steps S2 to S7 until the offset distance of the light spot is within the preset range.

[0051] The present invention also provides an optical fiber preform equipment, comprising any one of the calibration devices described above.

[0052] In summary, the calibration device of the present invention can reduce the complexity of the operation while meeting the high precision requirements during the vertical screw adjustment process. There is no need to place the vertical line, which avoids the possibility of introducing errors in the process of placing the vertical line. At the same time, it avoids the operation of the calibrator to measure and confirm up and down many times, which simplifies the operational difficulty of the entire calibration and the errors caused by human measurement.

[0053] It should be understood that although this specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation mode may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

[0054] The series of detailed descriptions listed above are only specific descriptions of feasible implementation methods of the present invention. They are not intended to limit the scope of protection of the present invention. Any equivalent implementation methods or changes that do not deviate from the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. A calibration device for vertical calibration of an optical fiber preform device, characterized in that: The calibration device comprises: A lead screw having a first position and a second position; A calibration platform is slidably disposed on the screw rod, and a lower surface of the calibration platform is perpendicular to the screw rod; A laser transmitter, which is disposed below the calibration platform and emits a laser perpendicular to a horizontal plane; A confirmation plate, disposed on the lower table and facing the laser emitter, the light spot of the laser emitter irradiating the confirmation plate; and a camera, disposed on the lower table to capture a light spot image of the confirmation plate; The camera respectively captures the spot images of the calibration platform at the first position and the second position, and determines the tilt direction of the lead screw according to the spot offset of the two spot images and adjusts the lead screw to be perpendicular to the horizontal plane; The laser transmitter has a horizontal bubble and a support foot, the support foot is adjusted horizontally according to the horizontal bubble, the laser emitted by the laser transmitter is perpendicular to the horizontal plane indicated by the horizontal bubble, and the sensing accuracy of the horizontal bubble is higher than the verticality requirement of the vertical screw rod for debugging.

2. The calibration device according to claim 1, characterized in that: The lead screw and the calibration platform are integrated in the optical fiber preform equipment.

3. The calibration device according to claim 1, characterized in that: When the calibration platform is located at the first position, the position of the laser emitter and the horizontality of the laser emitter are adjusted until the laser spot emitted by the laser emitter is irradiated on the center of the confirmation plate and the horizontality of the laser emitter is within the accuracy requirement, and the camera captures the spot image of the calibration platform at the first position.

4. The calibration device according to claim 3, characterized in that: When the calibration platform is located at the second position, the camera captures the light spot image of the calibration platform at the second position, and compares the light spot image at the second position with the light spot image at the first position, so as to determine the tilt direction of the screw rod and adjust the screw rod.

5. The calibration device according to claim 4, characterized in that: Move the calibration platform to the first position again, capture the light spot image at the first position, compare the light spot image at the second position with the light spot image at the first position, confirm the offset of the light spot, and if the offset of the light spot is within a preset range, stop calibrating the lead screw; if the offset of the light spot is outside the preset range, continue to calibrate the lead screw.

6. The calibration device according to claim 1, characterized in that: A cross-shaped vertical coordinate is drawn on the confirmation plate, and the cross-shaped vertical coordinate has an offset scale.

7. The calibration device according to claim 6, characterized in that: The light spot of the light spot image at the first position is located at the center of the cross-shaped vertical coordinate.

8. The calibration device according to claim 1, characterized in that: The height difference between the first position and the second position is greater than or equal to 1 meter.

9. The calibration device according to claim 1, characterized in that: The calibration device also includes a display device, which is communicatively connected to the camera, and the camera transmits the light spot image to the display device in real time.

10. A calibration method for a calibration device according to any one of claims 1 to 9, characterized in that: The calibration method includes Step S1: installing the confirmation plate and the camera on the lower surface of the calibration platform, wherein the camera can capture the front of the confirmation plate; Step S2: moving the calibration platform to the first position; Step S3: placing the laser transmitter under the calibration platform aligned with the confirmation plate; Step S4: adjusting the position of the laser emitter and the level of the laser emitter until the laser spot emitted by the laser emitter is irradiated on the center of the confirmation plate and the level of the laser emitter is within the accuracy requirement, and the camera captures the spot image at the first position; Step S5: moving the calibration platform from the first position to the second position, and capturing a light spot image at the second position by the camera; Step S6: Compare the two light spot images, determine the tilt direction of the lead screw according to the offset of the light spot, and adjust the lead screw accordingly.

11. The calibration method according to claim 10, characterized in that: After step S6, step S7 is also included: repeat steps S2 to S5. If the offset distance of the light spot in the two light spot images is within the preset range, the vertical calibration of the screw rod is completed; if the offset distance of the light spot in the two light spot images is outside the preset range, continue to repeat steps S2 to S7 until the offset distance of the light spot at the first position and the light spot at the second position is within the preset range.

12. An optical fiber preform device, characterized in that: Comprising the calibration device according to any one of claims 1-9.

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