A kind of inspection device and method of optical fiber prefabricated polishing rod

Abstract

The present invention provides an inspection device and method for an optical fiber preform polishing rod, wherein the inspection device for the optical fiber preform polishing rod comprises a clamping device and a tolerance detection device; the clamping device comprises a first clamping plate and a second clamping plate, and the first clamping plate and the second clamping plate are used to clamp the outer side of any group of opposite side surfaces on the optical fiber preform polishing rod; when one of the opposite side surfaces is in contact with the first clamping plate, a gap is formed between the other of the opposite side surfaces and the second clamping plate; the tolerance detection device is used to perform tolerance detection on the gap. The present invention is not only simple and convenient to operate, but also greatly improves the detection efficiency of the polishing rod, and ensures the accuracy of the processing precision detection of the polishing rod.

Description

Technical Field

[0001] The present invention relates to the technical field of optical fiber manufacturing, and in particular to an inspection device and method for an optical fiber prefabricated polishing rod. Background Art

[0002] The optical fiber prefabricated polishing rod (abbreviated as polishing rod) is one of the most important components in the optical fiber manufacturing process, and strict requirements are placed on the processing accuracy of the polishing rod. The cross section of the polishing rod is a regular octagon, which makes the eight sides of the polishing rod form four groups of symmetrically distributed opposite sides. Therefore, the detection of the processing accuracy of the polishing rod is to detect whether the processing dimensions of the four groups of opposite sides on the polishing rod are within the tolerance range.

[0003] At present, when inspecting the processing accuracy of the grinding rod, the inspection personnel mainly use a vernier caliper to inspect the relative sides of the grinding rod. Since the grinding rod has a certain length, according to the inspection requirements, it is necessary to inspect at least five points of each group of relative sides of each grinding rod in sequence along the length direction of the grinding rod, so each grinding rod needs to be inspected at least twenty times.

[0004] In actual testing, the vernier caliper-based testing method is cumbersome to operate and has low testing efficiency. Testers may experience testing fatigue during batch testing. When the grinding rod is long, due to arm fatigue, it is difficult for testers to ensure that the vernier caliper is well connected to the opposite side of the grinding rod, which affects the accuracy of the testing structure.

[0005] Among them, for vernier calipers with digital displays, unstable connection of the vernier caliper will cause the displayed readings to jump frequently, making it difficult for inspectors to read accurately. For vernier calipers with scales, inspectors will also experience visual fatigue after long-term batch testing, which will affect the accuracy of the vernier caliper readings. Summary of the invention

[0006] The present invention provides an inspection device and method for an optical fiber prefabricated polishing rod, which are used to solve the problems that the current inspection method based on a vernier caliper for the polishing rod has complicated operation, low inspection efficiency and difficulty in ensuring the accuracy of the inspection result.

[0007] The present invention provides an inspection device for an optical fiber preform polishing rod, comprising: a clamping device and a tolerance detection device; the clamping device comprises a first clamping plate and a second clamping plate, the first clamping plate and the second clamping plate are used to clamp the outer sides of any group of relative side surfaces on the optical fiber preform polishing rod; when one of the relative side surfaces is in contact with the first clamping plate, a gap is formed between the other of the relative side surfaces and the second clamping plate; the tolerance detection device is used to perform tolerance detection on the gap.

[0008] According to an inspection device for an optical fiber preform polishing rod provided by the present invention, the clamping spacing between the first clamping plate and the second clamping plate is equal to the sum of the standard width between the opposite side surfaces and a preset value; the tolerance detection device includes a go / no-go gauge; the go / no-go gauge includes a through end and a stop end, the diameter of the through end is equal to the difference between the preset value and the tolerance value, and the diameter of the stop end is equal to the sum of the preset value and the tolerance value.

[0009] According to an inspection device for an optical fiber preform polishing rod provided by the present invention, the clamping device also includes a linear drive mechanism, the first clamping plate is fixedly arranged, the second clamping plate is connected to the output end of the linear drive mechanism, and the output end of the linear drive mechanism can reciprocate along a direction perpendicular to the axial direction of the optical fiber preform polishing rod.

[0010] According to an inspection device for an optical fiber preform polishing rod provided by the present invention, the linear drive mechanism includes a servo motor, a lead screw and a connecting block, the output shaft of the servo motor is connected to one end of the lead screw, the lead screw is threadedly connected to the connecting block, the lead screw is arranged in a direction perpendicular to the axial direction of the optical fiber preform polishing rod, and the connecting block is connected to the second clamping plate.

[0011] The inspection device for an optical fiber preform polishing rod provided by the present invention further includes: a human-computer interaction module, and the human-computer interaction module is communicatively connected with the servo motor.

[0012] According to an inspection device for an optical fiber preform polishing rod provided by the present invention, the first clamping plate includes a vertical portion and a horizontal portion, the vertical portion is vertically connected to the horizontal portion, the vertical portion and the second clamping plate are used to clamp the optical fiber preform polishing rod, and a guiding mechanism is provided between the second clamping plate and the horizontal portion, the guiding mechanism is used to guide the second clamping plate along a direction perpendicular to the axial direction of the optical fiber preform polishing rod.

[0013] According to an inspection device for an optical fiber preform polishing rod provided by the present invention, the guide mechanism includes a guide rail and a guide groove; the second clamping plate is distributed on the first surface of the horizontal portion, the first surface is configured with a sunken groove, the guide rail is installed in the sunken groove, and the guide rail is arranged along a direction perpendicular to the axial direction of the optical fiber preform polishing rod; the guide groove is configured at one end of the second clamping plate facing the first surface, and the guide groove can be slidably installed on the guide rail.

[0014] According to an inspection device for an optical fiber preform polishing rod provided by the present invention, the spacing between one end of the guide rail facing the vertical portion and the opposite end face of the vertical portion is equal to the preset value; and / or, scale lines are provided on the vertical portion, and the scale lines are arranged along the axial direction of the optical fiber preform polishing rod.

[0015] According to the present invention, an inspection device for an optical fiber preform polishing rod further includes: a workbench, on which the clamping device is installed; a tool box and a holder are also provided on the workbench, on which the tolerance detection device is clamped; and a walking mechanism is installed at the bottom of the workbench.

[0016] The present invention also provides a detection method for the inspection device of the optical fiber preform polishing rod as described above, comprising: placing the optical fiber preform polishing rod between a first clamping plate and a second clamping plate, so that two opposite side surfaces on the optical fiber preform polishing rod are parallel to the first clamping plate and the second clamping plate, respectively; controlling the first clamping plate and the second clamping plate to reach a clamping spacing, fitting one of the opposite side surfaces with the first clamping plate, so that a gap is formed between the other opposite side surface and the second clamping plate, wherein the clamping spacing is equal to the sum of a standard width between the two opposite side surfaces and a preset value; selecting a tolerance detection device according to the preset value, and using the tolerance detection device to perform tolerance detection on the gap.

[0017] According to the detection method provided by the present invention, the tolerance detection of the gap using a tolerance detection device includes: selecting a go / no-go gauge for tolerance detection, and inserting the through end and the stop end of the go / no-go gauge into the gap respectively; wherein, if the through end can pass through the gap and the stop end cannot pass through the gap, the width between the opposite side surfaces of the optical fiber preform polishing rod is within the tolerance allowable range; if the through end cannot pass through the gap, the width between the opposite side surfaces of the optical fiber preform polishing rod is greater than the tolerance allowable width; if the stop end can pass through the gap, the width between the opposite side surfaces of the optical fiber preform polishing rod is less than the tolerance allowable width.

[0018] The present invention provides an inspection device and method for an optical fiber prefabricated polishing rod. By placing the polishing rod between a first clamping plate and a second clamping plate, the clamping distance between the two clamping plates can be set to form a gap between the side of the polishing rod and one of the clamping plates, so as to facilitate the indirect realization of the tolerance detection of the machining dimensions of the relative side surfaces on the polishing rod based on the tolerance detection of the gap. Compared with the detection method based on a vernier caliper, the present invention is not only simple and convenient to operate, but also greatly improves the detection efficiency of the polishing rod, and ensures the accuracy of the machining precision detection of the polishing rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1It is a schematic diagram of the three-dimensional structure of the inspection device for the optical fiber prefabricated polishing rod provided by the present invention;

[0021] Figure 2 It is a schematic diagram of the top view of the structure of the inspection device for the optical fiber prefabricated polishing rod provided by the present invention;

[0022] Figure 3 It is a structural schematic diagram of the clamping device provided by the present invention;

[0023] Figure 4 It is a schematic structural diagram of the second clamping plate on the clamping device provided by the present invention when it moves to the first end of the guide rail;

[0024] Figure 5 It is a schematic structural diagram of the second clamping plate on the clamping device provided by the present invention moving to the second end of the guide rail;

[0025] Figure 6 It is a structural schematic diagram of the optical fiber preform polishing rod inspection device provided by the present invention performing tolerance inspection on the optical fiber preform polishing rod;

[0026] Figure 7 It is a structural schematic diagram of the go / no-go gauge provided by the present invention;

[0027] Figure 8 It is a schematic structural diagram of the matching between the through end and the gap of the go / no-go gauge provided by the present invention;

[0028] Fig. 9 It is a schematic structural diagram of the matching of the stop end and the gap of the go / no-go gauge provided by the present invention;

[0029] Fig.10 It is a flow chart of a detection method of the inspection device based on the optical fiber prefabricated polishing rod provided by the present invention;

[0030] Reference numerals:

[0031] 1: Clamping device; 2: Fiber prefabrication polishing rod; 3: Go / no-go gauge;

[0032] 4: Human-computer interaction module; 5: Workbench; 6: Tool box;

[0033] 7: card seat; 8: walking mechanism; 11: first clamping plate;

[0034] 12: second clamping plate; 13: linear drive mechanism; 14: guide mechanism;

[0035] 110: vertical part; 111: horizontal part; 112: scale line;

[0036] 31: through end; 32: stop end; 131: servo motor;

[0037] 132: lead screw; 133: connecting block. DETAILED DESCRIPTION

[0038] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] Combine the following Figure 1-Figure 10 The present invention describes an inspection device and method for an optical fiber preform polishing rod.

[0040] like Figure 1 to Figure 2 As shown, the present invention provides an inspection device for an optical fiber preform polishing rod, comprising: a clamping device 1 and a tolerance detection device; the clamping device 1 comprises a first clamping plate 11 and a second clamping plate 12, the first clamping plate 11 and the second clamping plate 12 are used to clamp the outer side of any group of opposite side surfaces of the optical fiber preform polishing rod 2; when one of the opposite side surfaces of the optical fiber preform polishing rod 2 is in contact with the first clamping plate 11, a gap is formed between the other of the opposite side surfaces of the optical fiber preform polishing rod 2 and the second clamping plate 12; the tolerance detection device is used to perform tolerance detection on the gap. The optical fiber preform polishing rod 2 is referred to as a polishing rod in the following embodiments.

[0041] Specifically, by placing the grinding rod between the first clamping plate 11 and the second clamping plate 12, the clamping distance between the two clamping plates can be set to form a gap between the side of the grinding rod and one of the clamping plates, so as to facilitate the indirect realization of the tolerance detection of the machining dimensions of the relative side of the grinding rod based on the tolerance detection of the gap. Compared with the detection method based on the vernier caliper, the present invention is not only simple and convenient to operate, but also greatly improves the detection efficiency of the grinding rod, and ensures the accuracy of the machining precision detection of the grinding rod.

[0042] It should be pointed out here that the relative side surfaces of the optical fiber preform polishing rod 2 shown in this embodiment specifically refer to two side surfaces on the optical fiber preform polishing rod 2 that are arranged oppositely and in parallel. Since the optical fiber preform polishing rod 2 is a regular octagonal prism, the side surfaces of the optical fiber preform polishing rod 2 form four sets of relative side surfaces. When inspecting the optical fiber preform polishing rod, the actual setting positions of the first clamping plate 11 and the second clamping plate 12 are not specifically limited, and the positions of the first clamping plate 11 and the second clamping plate 12 can be interchanged. Among them, in this embodiment, one side surface on the optical fiber preform polishing rod 2 can be fitted with the first clamping plate 11, and the tolerance detection is performed on the gap formed between the other corresponding side surface on the optical fiber preform polishing rod 2 and the second clamping plate 12. In this embodiment, one side surface on the optical fiber preform polishing rod 2 can also be fitted with the second clamping plate 12, and the tolerance detection is performed on the gap formed between the other corresponding side surface on the optical fiber preform polishing rod 2 and the first clamping plate 11.

[0043] At the same time, in order to facilitate accurate tolerance detection of the machining dimensions of the opposite sides of the grinding rod, the present embodiment specifically sets the clamping distance between the first clamping plate 11 and the second clamping plate 12 to be equal to the sum of the standard width between the opposite sides of the grinding rod and the preset value. The present embodiment can set the preset value according to actual needs, and select a tolerance detection device of corresponding specifications according to the set preset value.

[0044] In actual detection, if the width between the opposite sides of the grinding rod is equal to the standard width, the width of the gap shown in this embodiment should be equal to the preset value. However, due to the processing error of the grinding rod, the width of the gap actually detected has a certain deviation from the preset value, and the deviation is also the deviation of the actual width between the opposite sides of the grinding rod relative to the standard width. Therefore, this embodiment can indirectly realize the tolerance detection of the processing size of the opposite sides of the grinding rod based on the tolerance detection of the gap.

[0045] Among them, in this embodiment, the preset value can be set to 5-10mm, for example: the preset value can be specifically 5mm, 6mm, 8mm, 10mm, etc., and no specific limitation is made here.

[0046] Meanwhile, the tolerance detection device shown in this embodiment can be an insert or an insert block known in the art. Since the width between the opposite sides of the grinding rod is allowed to have a floating deviation of ±0.05 mm based on the standard width shown in the above embodiment, the specific width of the insert or the insert block can be 5±0.05 mm, 6±0.05 mm, 8±0.05 mm, or 10±0.05 mm.

[0047] Further, the tolerance detection device shown in this embodiment is preferably a go / no-go gauge 3, which includes a through end 31 and a stop end 32, wherein the diameter of the through end 31 is equal to the difference between the preset value and the tolerance value, and the diameter of the stop end 32 is equal to the sum of the preset value and the tolerance value. For example, when the preset value is set to 5 mm and the tolerance value is set to 0.05 mm, the diameter of the through end 31 of the go / no-go gauge 3 shown in this embodiment is 4.95 mm, and the diameter of the stop end 32 is 5.05 mm.

[0048] like Figures 6 to 9 As shown, when the tolerance of the gap is tested, it is only necessary to insert the through end 31 and the stop end 32 of the go / no-go gauge 3 into the gap respectively. Figure 8 The through end 31 of the go / no-go gauge 3 is specifically shown to be inserted between the grinding rod and the second clamping plate 12. Fig. 9 It is specifically shown that the stop end 32 of the go / no-go gauge 3 is inserted between the grinding rod and the second clamping plate 12 .

[0049] When making a tolerance judgment on the gap, if the through end 31 can pass through the gap and the stop end 32 cannot pass through the gap, the width between the opposite sides of the optical fiber preform polishing rod 2 is within the tolerance range; if the through end 31 cannot pass through the gap, the width between the opposite sides of the optical fiber preform polishing rod 2 is greater than the tolerance width; if the stop end 32 can pass through the gap, the width between the opposite sides of the optical fiber preform polishing rod 2 is less than the tolerance width.

[0050] Among them, when the tolerance range is set to ±0.05mm, the tolerance shown in this embodiment allows the width to be greater than the difference between the standard width between the opposite sides of the grinding rod and 0.05mm, and less than the sum of the standard width between the opposite sides of the grinding rod and 0.05mm.

[0051] Preferably, if Figure 1 to Figure 2 As shown, the clamping device 1 shown in this embodiment also includes a linear drive mechanism 13, the first clamping plate 11 is fixedly arranged, the second clamping plate 12 is connected to the output end of the linear drive mechanism 13, and the output end of the linear drive mechanism 13 can reciprocate along a direction perpendicular to the axial direction of the optical fiber preform polishing rod 2. The linear drive mechanism 13 can be a linear motor, a hydraulic cylinder, an electric push rod, etc. known in the art, and is not specifically limited here.

[0052] Furthermore, in order to ensure the moving accuracy of the output end of the linear drive mechanism 13, the linear drive mechanism 13 shown in this embodiment includes a servo motor 131, a lead screw 132 and a connecting block 133. The output shaft of the servo motor 131 is connected to one end of the lead screw 132. The lead screw 132 is threadedly connected to the connecting block 133. The lead screw 132 is arranged along a direction perpendicular to the axial direction of the optical fiber preform polishing rod 2. The connecting block 133 is connected to the second clamping plate 12. Among them, a threaded hole is opened on the connecting block 133 shown in this embodiment, and the lead screw 132 is threadedly connected to the threaded hole.

[0053] Among them, the first clamping plate 11 shown in this embodiment includes a vertical portion 110 and a horizontal portion 111, the vertical portion 110 and the horizontal portion 111 are vertically connected, the vertical portion 110 and the second clamping plate 12 are used to clamp the optical fiber preform polishing rod 2, and a guide mechanism 14 is arranged between the second clamping plate 12 and the horizontal portion 111, and the guide mechanism 14 is used to guide the second clamping plate 12 along a direction perpendicular to the axial direction of the optical fiber preform polishing rod 2.

[0054] Therefore, when the lead screw 132 on the linear drive mechanism 13 rotates, based on the directional guiding function of the guide mechanism 14 , the connecting block 133 on the lead screw 132 can only move along the axial direction of the lead screw 132 to drive the second clamping plate 12 to approach or move away from the first clamping plate 11 .

[0055] like Figure 3 As shown, the guide mechanism 14 shown in this embodiment includes a guide rail and a guide groove; the second clamping plate 12 is distributed on the first surface of the horizontal portion 111, and the first surface is configured with a sinking groove, and the guide rail is installed in the sinking groove, and the guide rail is arranged along a direction perpendicular to the axial direction of the optical fiber preform polishing rod 2; the guide groove is configured at one end of the second clamping plate 12 facing the first surface, and the guide groove can be slidably installed on the guide rail. Here, by providing the sinking groove, this embodiment can make the guide rail sink into the sinking groove, ensuring that the second clamping plate 12 can smoothly reciprocate on the first surface of the horizontal portion 111.

[0056] In this embodiment, the distance between one end of the guide rail facing the vertical portion 110 and the opposite end surface of the vertical portion 110 can be set to be equal to a preset value. Therefore, when controlling the movement of the second clamping plate 12 in this embodiment, it is only necessary to control the movement of the second clamping plate 12 to a corresponding stroke according to the standard width between the opposite side surfaces on the grinding rod.

[0057] like Figure 4 As shown, when the second clamping plate 12 shown in this embodiment moves to the first end of the guide rail, the spacing between the first clamping plate 11 and the second clamping plate 12 is the preset value shown in the above embodiment. At this time, the position of the second clamping plate 12 is Figure 4 The position indicated by the arrow P1.

[0058] like Figure 5 As shown, when the second clamping plate 12 shown in this embodiment moves to the second end of the guide rail, the distance between the first clamping plate 11 and the second clamping plate 12 reaches the maximum value. At this time, the position of the second clamping plate 12 is Figure 5 In actual testing, in order to facilitate tolerance testing of the grinding rod, the length between the first end and the second end of the guide rail can be set to be the standard width between the opposite sides of the grinding rod, so that the clamping distance between the first clamping plate 11 and the second clamping plate 12 is equal to the sum of the standard width between the opposite sides of the grinding rod and a preset value.

[0059] like Figure 1 and Figure 2 As shown, this embodiment is also provided with a human-machine interaction module 4, which can be a touch screen controller known in the art or a display panel with a display screen and operation buttons. Among them, the human-machine interaction module 4 is connected to the servo motor 131 for communication. The operator can input a control instruction to the servo motor 131 through the human-machine interaction module 4. For example, when the second clamping plate 12 is initially at the position indicated by the arrow P1, the control instruction shown in this embodiment is to control the second clamping plate 12 to move toward the position indicated by the arrow P2. The servo driver connected to the servo motor 131 will respond to the control instruction so as to control the operation of the servo motor 131, and the servo motor 131 drives the second clamping plate 12 to reach the commanded position.

[0060] like Figure 2 As shown, in order to facilitate intuitive reading of the length of the polishing rod, the present embodiment may further be provided with scale lines 112 on the vertical portion 110, and the scale lines 112 are arranged along the axial direction of the optical fiber preform polishing rod 2. The scale lines 112 can have a range of 0-750 mm, so that when detecting the length of the polishing rod, there is no need to set up a tape measure separately.

[0061] like Figure 1 As shown, this embodiment is also provided with a workbench 5, and the clamping device 1 is installed on the workbench 5; the workbench 5 is also provided with a tool box 6 and a holder 7, and the holder 7 is used to clamp the tolerance detection device; the bottom of the workbench 5 is provided with a walking mechanism 8.

[0062] The workbench 5 has a table top, the first clamping plate 11 and the second clamping plate 12 shown in the above embodiment are located on the table top, and the linear drive mechanism 13 shown in the above embodiment is installed on the lower side of the table top.

[0063] At the same time, in this embodiment, the tool box 6 can also be placed on the table, and auxiliary supplies such as a flashlight, alcohol, and a clean cloth for detecting the appearance of the polishing rod can be placed in the tool box 6. The holder 7 shown in this embodiment is provided with a bayonet, which can be connected with the go / no-go gauge 3.

[0064] In addition, the traveling mechanism 8 shown in this embodiment may specifically include outward wheels with brakes and directional wheels.

[0065] like Fig.10 As shown, the present embodiment also provides a detection method for the inspection device of the optical fiber preform polishing rod as described above, comprising: S1, placing the optical fiber preform polishing rod between the first clamping plate and the second clamping plate, so that the two opposite side surfaces on the optical fiber preform polishing rod are parallel to the first clamping plate and the second clamping plate respectively; S2, controlling the first clamping plate and the second clamping plate to reach a clamping distance, fitting one of the opposite side surfaces with the first clamping plate, so that a gap is formed between the other opposite side surface and the second clamping plate, wherein the clamping distance is equal to the sum of the standard width between the two opposite side surfaces and a preset value; S3, selecting a tolerance detection device according to the preset value, and using the tolerance detection device to perform tolerance detection on the gap.

[0066] Specifically, by placing the grinding rod between the first clamping plate and the second clamping plate, the clamping distance between the two clamping plates can be set to form a gap between the side of the grinding rod and one of the clamping plates, so as to facilitate the indirect realization of the tolerance detection of the machining dimensions of the opposite side of the grinding rod based on the tolerance detection of the gap. Compared with the detection method based on the vernier caliper, the present invention is not only simple and convenient to operate, but also greatly improves the detection efficiency of the grinding rod and ensures the detection accuracy.

[0067] Furthermore, the tolerance detection device shown in this embodiment is used to perform tolerance detection on the gap, including: selecting a go / no-go gauge for tolerance detection, and inserting the through end and the stop end of the go / no-go gauge into the gap respectively; wherein, if the through end can pass through the gap and the stop end cannot pass through the gap, the width between the opposite side surfaces of the optical fiber preform polishing rod is within the tolerance allowable range; if the through end cannot pass through the gap, the width between the opposite side surfaces of the optical fiber preform polishing rod is greater than the tolerance allowable width; if the stop end can pass through the gap, the width between the opposite side surfaces of the optical fiber preform polishing rod is less than the tolerance allowable width.

[0068] Among them, in this embodiment, when the tolerance range is set to ±0.05 mm, the tolerance allowed width shown in this embodiment is greater than the difference between the standard width between the opposite sides of the grinding rod and 0.05 mm, and less than the sum of the standard width between the opposite sides of the grinding rod and 0.05 mm.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An inspection device for an optical fiber preform polishing rod, characterized in that: include: The clamping device comprises a first clamping plate and a second clamping plate, wherein the first clamping plate and the second clamping plate are used to clamp the outer sides of any set of opposite side surfaces on the optical fiber preform polishing rod; when one of the opposite side surfaces is in contact with the first clamping plate, a gap is formed between the other of the opposite side surfaces and the second clamping plate; A tolerance detection device, used for performing tolerance detection on the gap; The clamping distance between the first clamping plate and the second clamping plate is equal to the sum of the standard width between the opposite side surfaces and a preset value; The tolerance detection device comprises a go / no-go gauge; the go / no-go gauge comprises a through end and a stop end, the diameter of the through end is equal to the difference between the preset value and the tolerance value, and the diameter of the stop end is equal to the sum of the preset value and the tolerance value; The clamping device also includes a linear drive mechanism, the first clamping plate is fixedly arranged, the second clamping plate is connected to the output end of the linear drive mechanism, and the output end of the linear drive mechanism can reciprocate along a direction perpendicular to the axial direction of the optical fiber preform polishing rod.

2. The inspection device for optical fiber preform polishing rod according to claim 1, characterized in that: The linear drive mechanism includes a servo motor, a lead screw and a connecting block, the output shaft of the servo motor is connected to one end of the lead screw, the lead screw is threadedly connected to the connecting block, the lead screw is arranged in a direction perpendicular to the axial direction of the optical fiber preform polishing rod, and the connecting block is connected to the second clamping plate.

3. The inspection device for optical fiber preform polishing rod according to claim 2, characterized in that: Also includes: A human-machine interaction module, the human-machine interaction module is communicatively connected with the servo motor; It also includes: a workbench, and the clamping device is installed on the workbench; The workbench is also provided with a tool box and a holder, and the holder is used for mounting the tolerance detection device; and a walking mechanism is installed at the bottom of the workbench.

4. The inspection device for optical fiber preform polishing rod according to claim 2, characterized in that: The first clamping plate includes a vertical portion and a horizontal portion, the vertical portion is vertically connected to the horizontal portion, the vertical portion and the second clamping plate are used to clamp the optical fiber preform polishing rod, and a guiding mechanism is provided between the second clamping plate and the horizontal portion, the guiding mechanism is used to guide the second clamping plate along a direction perpendicular to the axial direction of the optical fiber preform polishing rod.

5. The inspection device for optical fiber preform polishing rod according to claim 4, characterized in that: The guiding mechanism comprises a guide rail and a guide groove; the second clamping plate is distributed on the first surface of the horizontal portion, the first surface is configured with a sunken groove, the guide rail is installed in the sunken groove, and the guide rail is arranged along a direction perpendicular to the axial direction of the optical fiber preform polishing rod; the guide groove is configured at one end of the second clamping plate facing the first surface, and the guide groove is slidably installed on the guide rail.

6. The inspection device for optical fiber preform polishing rod according to claim 5, characterized in that: The distance between one end of the guide rail facing the vertical portion and the opposite end surface of the vertical portion is equal to the preset value; And / or, the vertical portion is provided with scale lines, and the scale lines are arranged along the axial direction of the optical fiber preform polishing rod.

7. A detection method for the inspection device of the optical fiber preform polishing rod according to any one of claims 1 to 6, characterized in that: include: Placing an optical fiber preform polishing rod between the first clamping plate and the second clamping plate so that two opposite side surfaces of the optical fiber preform polishing rod are parallel to the first clamping plate and the second clamping plate respectively; Control the first clamping plate and the second clamping plate to reach a clamping distance, fit one of the opposite side surfaces to the first clamping plate, so that a gap is formed between the other opposite side surface and the second clamping plate, wherein the clamping distance is equal to the sum of the standard width between the two opposite side surfaces and a preset value; A tolerance detection device is selected according to a preset value, and the tolerance detection device is used to perform tolerance detection on the gap.

8. The detection method according to claim 7, characterized in that: The method of using a tolerance detection device to perform tolerance detection on the gap includes: Use a go / no-go gauge to check the tolerance, and insert the go end and the no-go end of the go / no-go gauge into the gap respectively; If the through end can pass through the gap and the stop end cannot pass through the gap, the width between the opposite sides of the optical fiber preform polishing rod is within the tolerance range; If the through end cannot pass through the gap, the width between the opposite sides of the optical fiber preform polishing rod is greater than the tolerance allowable width; If the stop end can pass through the gap, the width between the opposite side surfaces of the optical fiber preform polishing rod is smaller than the tolerance allowable width.

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