阅读说明：本技术 一种带声光报警和计数的护套外径超差监测装置及其使用方法 (Sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting functions and using method thereof ) 是由 陈云 刘宇 周金虎 张冬梅 薛栋伟 刘晓洪 黄晓炜 俞丽花 周震华 于 2020-12-29 设计创作，主要内容包括：本发明涉及一种带声光报警和计数的护套外径超差监测装置及其使用方法,属于光缆表面鼓包和颈缩监测技术领域。包括壳体,所述壳体竖向穿设测杆；所述测杆底部设有压轮,所述压轮与生产线上的托轮上下相对间隔设置,形成光缆的监测通道；所述壳体安装底板,所述底板上穿设指针轴,所述壳体内设有双联齿轮,所述指针轴上设置指针齿轮,所述双联齿轮的大齿轮与指针齿轮相啮合；所述测杆上设有齿条,所述双联齿轮的小齿轮与齿条相啮合,所述指针轴上设有指针,且所述指针设于底板外；所述壳体上设置表盘,所述表盘上开设弧形槽,对应所述弧形槽的所述表盘上设有刻度线。本申请能够在线实时检测护套外径超差情况,提高了检测准确性。(The invention relates to a sheath outer diameter out-of-tolerance monitoring device with sound and light alarm and counting functions and a using method thereof, and belongs to the technical field of optical cable surface bulging and necking monitoring. The device comprises a shell, wherein a measuring rod vertically penetrates through the shell; the bottom of the measuring rod is provided with a pressing wheel, and the pressing wheel and a riding wheel on the production line are arranged at intervals up and down to form a monitoring channel of the optical cable; the shell is provided with a bottom plate, a pointer shaft penetrates through the bottom plate, a duplicate gear is arranged in the shell, a pointer gear is arranged on the pointer shaft, and a large gear of the duplicate gear is meshed with the pointer gear; a rack is arranged on the measuring rod, a pinion of the duplicate gear is meshed with the rack, a pointer is arranged on the pointer shaft, and the pointer is arranged outside the bottom plate; the dial plate is arranged on the shell, an arc-shaped groove is formed in the dial plate, and scale marks are arranged on the dial plate corresponding to the arc-shaped groove. The method and the device can detect the out-of-tolerance condition of the outer diameter of the sheath in real time on line, and improve the detection accuracy.)

1. The utility model provides a take audible and visual alarm and sheath external diameter out of tolerance monitoring devices of count which characterized in that: the measuring device comprises a shell (11) and a measuring rod (1), wherein the measuring rod (1) vertically penetrates through the shell (11), and the upper end and the lower end of the measuring rod (1) are respectively exposed out of the shell (11); the bottom of the measuring rod (1) is provided with a pressing wheel (5), the pressing wheel (5) and a supporting wheel (7) on a production line are arranged at intervals up and down relatively to form a monitoring channel of the optical cable; a bottom plate (9) is mounted on the shell (11), a pointer shaft (19) penetrates through the bottom plate (9), a duplicate gear is arranged in the shell (11), a pointer gear (20) is arranged on the pointer shaft (19), and a large gear (16) of the duplicate gear is meshed with the pointer gear (20); a rack (15) is arranged on the measuring rod (1), a pinion (21) of the duplicate gear is meshed with the rack (15), and a pointer (4) is arranged on the pointer shaft (19); a dial plate (2) is further arranged on the shell (11), an arc-shaped groove is formed in the dial plate (2), a scale mark used for displaying an outer diameter ultra-difference value is arranged on the dial plate (2) corresponding to the arc-shaped groove, and the pointer extends into the arc-shaped groove; optical cable (6) pass in succession monitoring passageway, pinch roller (5) elasticity is pressed in optical cable (6) surface all the time, the sheath external diameter of optical cable changes and promotes pinch roller (5) and bounce from top to bottom, drives measuring staff (1) and rocks from top to bottom in step, through the straight line action of duplicate gear with measuring staff (1) converts pointer axle (19) deflection action into for pointer (4) synchronous deflection, the scale interval that pointer (4) instructed is the overcoat super difference value promptly.

2. The sheath external diameter out-of-tolerance monitoring device with the audible and visual alarm and the counting function of claim 1 is characterized in that: the central position of the arc-shaped groove is set as the 0 position of the scale mark and corresponds to the standard value of the diameter of the sheath of the optical cable (6).

3. The sheath external diameter out-of-tolerance monitoring device with the audible and visual alarm and the counting function of claim 1 is characterized in that: an upper limit proximity switch (3) and a lower limit proximity switch (8) are arranged in the arc-shaped groove, and the upper limit proximity switch (3) and the lower limit proximity switch (8) are respectively in signal connection with a control box (10).

4. The sheath external diameter out-of-tolerance monitoring device with the audible and visual alarm and the counting function of claim 3 is characterized in that: an alarm, a counter and a reset switch are further arranged in the control box (10), and the upper limit proximity switch (3) or the lower limit proximity switch (8) triggers the alarm and the counter to work.

5. The sheath external diameter out-of-tolerance monitoring device with the audible and visual alarm and the counting function of claim 1 is characterized in that: an upper spring (12) and a lower spring (18) are sleeved on the measuring rod (1), the upper spring (12) is arranged above the rack (15), the lower spring (18) is arranged below the rack (15), and pre-pressing amounts are reserved on the upper spring (15) and the lower spring (18) respectively.

6. The sheath external diameter out-of-tolerance monitoring device with the audible and visual alarm and the counting function of claim 5 is characterized in that: the prepressing amount is 1-2 mm.

7. The sheath external diameter out-of-tolerance monitoring device with the audible and visual alarm and the counting function of claim 1 is characterized in that: still be equipped with the direction unit in casing (11), the direction unit is including preventing changeing guide arm (14) and guide plate (13), guide plate (13) are fixed on casing (11), just vertical guide way of seting up on guide plate (13), prevent changeing that guide arm (14) transversely sets up, one end and rack (15) fixed connection, the other end and guide way sliding fit.

8. The sheath external diameter out-of-tolerance monitoring device with the audible and visual alarm and the counting function of claim 1 is characterized in that: a reset spring is sleeved on the pointer shaft (19); when the pointer shaft (19) is pulled outwards, the pointer gear (20) on the pointer shaft (19) is separated from the large gear (16) and is in a zero calibration state of the pointer (4); and releasing the pointer shaft (19), and pushing the pointer shaft (19) to reset by the reset spring, so that the pointer gear (20) is meshed with the large gear (16) again and is in a normal working state.

9. The use method of the sheath outer diameter out-of-tolerance monitoring device with the audible and visual alarm and the counting function based on the claims 1 to 8 is characterized in that: the using method comprises the following steps:

designing a transmission ratio among a rack, a duplicate gear and a pointer gear, converting and amplifying vertical displacement of a measuring bar into a rotation angle of a pointer, and marking scale marks on a dial plate;

secondly, positioning and installing an upper limit proximity switch and a lower limit proximity switch according to scale marks marked on the dial plate;

thirdly, the optical cable is arranged in the monitoring channel, the pressing wheel is in contact with the surface of the optical cable, and the prepressing amount is kept;

step four, pulling the pointer shaft outwards to enable the pointer gear to be disengaged from the duplicate gear and to be in a zero calibration state, rotating the pointer shaft to drive the pointer to rotate to a '0' position marked on the dial plate, and completing the zero calibration of the pointer;

releasing the pointer shaft, and resetting the pointer shaft under the action of the elastic force of the reset spring to ensure that the pointer gear and the duplicate gear are meshed again and are in a working state;

drawing the optical cable to move forwards, pushing the measuring rod to move upwards or downwards by the pressing wheel to drive the rack to move upwards or downwards, and driving the pointer shaft and the pointer to rotate through the matching of the rack and the large gear of the duplicate gear and the small gear of the duplicate gear and the pointer gear;

a. when the outer diameter of the sheath is within the range of the upper deviation value and the lower deviation value, the fluctuation of the pointer slightly swings back and forth between the upper limit proximity switch and the lower limit proximity switch but does not cross the upper limit proximity switch and the lower limit proximity switch, namely the outer diameter of the sheath does not have an out-of-tolerance phenomenon, and at the moment, the audible and visual alarm and the counter do not act;

b. when the outer diameter of the sheath exceeds the upper deviation value, the outer diameter of the sheath is increased, and the pressing wheel is jacked at the position where the outer diameter of the sheath is increased, so that the measuring rod is lifted to drive the rack to lift; when the outer diameter of the sheath exceeds the lower deviation value, the outer diameter of the sheath is reduced, the pre-pressure of the upper spring pushes the measuring rod to descend, so that the pressing wheel is kept in contact with the surface of the optical cable, and the rack is driven to descend; the rack on the measuring rod drives the duplicate gear to rotate, so that the pointer shaft rotates to drive the pointer to rotate to cross an upper limit proximity switch or a lower limit proximity switch set at the outer diameter limit position, the upper limit proximity switch or the lower limit proximity switch is triggered, and an audible and visual alarm and a counter on the control box are triggered to act.

Technical Field

The invention relates to a sheath outer diameter out-of-tolerance monitoring device with sound and light alarm and counting functions and a using method thereof, and belongs to the technical field of optical cable surface bulging and necking monitoring.

Background

With the continuous development of the optical communication industry, the market competition of communication optical cables is intensified day by day, and the refined control of the outer diameter of the optical cable sheath is beneficial to reducing cost and energy consumption and improving the competitiveness of products. The sheath is the last protective structure in the production of the optical cable and is the most visual appearance of the quality of the optical cable product. Whether the outer diameter of the sheath is accurately controlled directly influences the production cost of the optical cable, and the subsequent laying construction of the optical cable is greatly influenced.

The outer diameter of the sheath can be roughly divided into two types: one is that the whole outer diameter of the optical cable sheath is larger or smaller, the larger the outer diameter increases the cost of the optical cable and affects the subsequent construction (if the pipeline and the clamp are not matched), and the smaller the outer diameter is, the thickness of the sheath layer is not enough, and the protection to the optical cable is reduced; one is that the outer diameter of the optical cable sheath is suddenly changed in a small local section of length, and the larger part is called as a bulge, which affects the subsequent optical cable laying construction (such as the pipe optical cable is clamped), the smaller part is called as a necking, a local weak point is generated on the surface of the optical cable, and the part is possibly damaged firstly in the construction and use process.

In order to ensure the quality of the optical cable, the outer diameter of the sheath of the optical cable needs to be detected whether the outer diameter of the sheath of the optical cable has an out-of-tolerance phenomenon in the production process of the sheath. The existing sheath outer diameter out-of-tolerance monitoring generally adopts a non-contact infrared concave-convex detector, and leakage detection and gap filling are realized by combining manual observation and touch.

However, the existing monitoring of the outer diameter of the sheath with out-of-tolerance has the following disadvantages:

1. the non-contact infrared concave-convex detector has high detection precision and no loss, but has high false alarm rate, needs regular maintenance and has high cost;

2. the non-contact infrared concave-convex detector collects signals, transmits the signals to the production line host computer, processes the signals and displays the signals on an operation interface, and the signal transmission has high failure rate and is easy to damage and lose efficacy;

3. the manual observation and touch reliability is low, the whole-course tracking cannot be kept, and the operability is not high.

Disclosure of Invention

The invention aims to solve the technical problem of providing a sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting and a using method thereof aiming at the prior art, so that the detection accuracy is improved, and the sheath outer diameter out-of-tolerance condition is detected on line in real time.

The technical scheme adopted by the invention for solving the problems is as follows: a sheath outer diameter out-of-tolerance monitoring device with acousto-optic alarm and counting comprises a shell and a measuring rod, wherein the measuring rod vertically penetrates through the shell, and the upper end and the lower end of the measuring rod are respectively exposed out of the shell; the bottom of the measuring rod is provided with a pressing wheel, and the pressing wheel and a riding wheel on the production line are arranged at intervals up and down to form a monitoring channel of the optical cable; a bottom plate is mounted on the shell, a pointer shaft penetrates through the bottom plate, a duplicate gear is arranged in the shell, a pointer gear is arranged on the pointer shaft, and a large gear of the duplicate gear is meshed with the pointer gear; a rack is arranged on the measuring rod, a pinion of the duplicate gear is meshed with the rack, and a pointer is arranged on the pointer shaft; the casing is also provided with a dial plate, an arc-shaped groove is formed in the dial plate, a scale mark used for displaying the outer diameter ultra-difference value is arranged on the dial plate corresponding to the arc-shaped groove, and the pointer extends into the arc-shaped groove; the optical cable continuously penetrates through the monitoring channel, the pinch roller is always elastically pressed on the surface of the optical cable, the change of the outer diameter of a sheath of the optical cable pushes the pinch roller to bounce up and down to drive the measuring rod to synchronously rock up and down, the linear action of the measuring rod is converted into pointer shaft deflection action through the dual gear, so that the pointer synchronously deflects, and the scale value indicated by the pointer is the jacket over-differential value.

The central position of the arc-shaped groove is set as the 0 position of the scale mark, and corresponds to the standard value of the diameter of the optical cable sheath.

An upper limit proximity switch and a lower limit proximity switch are arranged in the arc-shaped groove and are respectively in signal connection with the control box.

An alarm, a counter and a reset switch are further arranged in the control box, and the upper limit proximity switch or the lower limit proximity switch triggers the alarm and the counter to work.

An upper spring and a lower spring are sleeved on the measuring rod, the upper spring is arranged above the rack, the lower spring is arranged below the rack, and pre-pressing amounts are reserved on the upper spring and the lower spring respectively.

The prepressing amount is 1-2 mm.

The anti-rotation gear is characterized in that a guide unit is further arranged in the shell and comprises an anti-rotation guide rod and a guide piece, the guide piece is fixed on the shell, a guide groove is vertically formed in the guide piece, the anti-rotation guide rod is transversely arranged, one end of the anti-rotation guide rod is fixedly connected with the rack, and the other end of the anti-rotation guide rod is in sliding fit with the guide groove.

A reset spring is sleeved on the pointer shaft; when the pointer shaft is pulled outwards, the pointer gear on the pointer shaft is separated from the large gear and is in a pointer zero calibration state; and releasing the pointer shaft, and pushing the pointer shaft to reset by the reset spring, so that the pointer gear and the large gear are meshed again and are in a normal working state.

A use method of a sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting comprises the following steps:

designing a transmission ratio among a rack, a duplicate gear and a pointer gear, converting and amplifying vertical displacement of a measuring bar into a rotation angle of a pointer, and marking scale marks on a dial plate;

secondly, positioning and installing an upper limit proximity switch and a lower limit proximity switch according to scale marks marked on the dial plate;

thirdly, the optical cable is arranged in the monitoring channel, the pressing wheel is in contact with the surface of the optical cable, and the prepressing amount is kept;

step four, pulling the pointer shaft outwards to enable the pointer gear to be disengaged from the duplicate gear and to be in a zero calibration state, rotating the pointer shaft to drive the pointer to rotate to a '0' position marked on the dial plate, and completing the zero calibration of the pointer;

releasing the pointer shaft, and resetting the pointer shaft under the action of the elastic force of the reset spring to ensure that the pointer gear and the duplicate gear are meshed again and are in a working state;

drawing the optical cable to move forwards, pushing the measuring rod to move upwards or downwards by the pressing wheel to drive the rack to move upwards or downwards, and driving the pointer shaft and the pointer to rotate through the matching of the rack and the large gear of the duplicate gear and the small gear of the duplicate gear and the pointer gear;

a. when the outer diameter of the sheath is within the range of the upper deviation value and the lower deviation value, the fluctuation of the pointer slightly swings back and forth between the upper limit proximity switch and the lower limit proximity switch but does not cross the upper limit proximity switch and the lower limit proximity switch, namely the outer diameter of the sheath does not have an out-of-tolerance phenomenon, and at the moment, the audible and visual alarm and the counter do not act;

b. when the outer diameter of the sheath exceeds the upper deviation value, the outer diameter of the sheath is increased, and the pressing wheel is jacked at the position where the outer diameter of the sheath is increased, so that the measuring rod is lifted to drive the rack to lift; when the outer diameter of the sheath exceeds the lower deviation value, the outer diameter of the sheath is reduced, the pre-pressure of the upper spring pushes the measuring rod to descend, so that the pressing wheel is kept in contact with the surface of the optical cable, and the rack is driven to descend; the rack on the measuring rod drives the duplicate gear to rotate, so that the pointer shaft rotates to drive the pointer to rotate to cross an upper limit proximity switch or a lower limit proximity switch set at the outer diameter limit position, the upper limit proximity switch or the lower limit proximity switch is triggered, and an audible and visual alarm and a counter on the control box are triggered to act.

Compared with the prior art, the invention has the advantages that: a sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting and a use method thereof,

1. the increase of sheath external diameter and reduction change into the displacement volume of measuring staff vertical direction, and the rotation angle of pointer is transformed and enlargied into in the transmission between rethread rack, duplicate gear and the pointer gear, through reasonable design gear drive ratio, stir the less sheath external diameter deviation and enlarge for the great angle deflection of pointer, and the increase and the reduction of optical cable sheath external diameter all can on-line real-time supervision, and simple structure is compact, occupation space is little.

2. Be equipped with spacing proximity switch and lower spacing proximity switch in this application, and go up spacing switch and can trigger audible-visual annunciator and counter respectively with lower spacing proximity switch, can trigger audible-visual annunciator respectively when the sheath external diameter is out of tolerance to carry out independent count to upper deviation value and lower deviation value.

3. The monitoring channel formed by the pinch roller and the riding wheel and the optical cable sheath are in rolling friction, so that the resistance is small, and the appearance of the optical cable is not influenced.

4. What this application monitored is the change value of optical cable sheath external diameter, to the applicable no scope restriction of optical cable sheath external diameter, can monitor the optical cable sheath external diameter of different thicknesses.

Drawings

FIG. 1 is a three-dimensional schematic view of a sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting according to an embodiment of the invention;

FIG. 2 is a front view of FIG. 1;

FIG. 3 is a schematic view (removing the control box) of a sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting according to an embodiment of the present invention;

FIG. 4 is a schematic rear view of FIG. 3;

FIG. 5 is a schematic diagram illustrating the usage steps of a sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting according to an embodiment of the present invention;

in the figure, a measuring rod 1, a dial 2, an upper limit approach switch 3, a pointer 4, a pinch roller 5, an optical cable 6, a riding wheel 7, a lower limit approach switch 8, a bottom plate 9, a control box 10, a shell 11, an upper spring 12, a guide plate 13, an anti-rotation guide rod 14, a rack 15, a large gear 16, a bearing seat 17, a lower spring 18, a pointer shaft 19, a pointer gear 20 and a pinion 21 are arranged.

Detailed Description

The invention is described in further detail below with reference to the accompanying examples.

As shown in fig. 1, 2, 3, and 4, the sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting in the embodiment includes a housing 11, a measuring rod 1 is vertically movably inserted in the housing 11, so that the upper end and the lower end of the measuring rod 1 are exposed out of the housing 11, a pinch roller 5 is arranged at the bottom end of the measuring rod 1, the pinch roller 5 and a supporting roller 7 on a production line are arranged oppositely at an upper interval and a lower interval, and a monitoring channel of an optical cable 6 is formed. A rack 15 is arranged in the shell 11, and the rack 15 is fixed on the measuring rod 1. The bottom plate 9 is installed on the shell 11, the pointer shaft 19 penetrates through the bottom plate 9, the pointer shaft 19 is partially arranged on the inner side of the bottom plate 9, namely in the shell 11, and partially arranged on the outer side of the bottom plate 9. A duplicate gear is arranged in the shell 11, and the pointer shaft 19 and a rotating shaft of the duplicate gear are fixed on the bottom plate 9 through a bearing seat 17. The pointer shaft 19 is provided with a pointer gear 20, the pointer gear 20 is meshed with the large gear 16 in the duplicate gear, the pointer shaft 19 exposed out of the bottom plate 9 is provided with a pointer 4, one end of the pointer 4 is in threaded connection with the pointer shaft 19, so that the pointer 4 is fixed on the pointer shaft 19, and when the pointer shaft 19 rotates, the pointer 4 is driven to rotate. The pinion 21 in the dual gear is meshed with the rack 15 on the measuring rod 1, and when the measuring rod 1 moves upwards or downwards, the rack 15 is driven to move synchronously, so that the pinion 21 rotates, namely the dual gear rotates. The linear motion of the measuring rod 1 is converted into the rotary motion of the dual gear through the dual gear, and the pointer gear 20 is driven to rotate, namely the pointer 4 rotates. The casing 11 is provided with a dial 2, and the dial 2 and the bottom plate 9 seal the casing 11. The top of the dial plate 2 is provided with an arc-shaped groove, the dial plate 2 corresponding to the arc-shaped groove is marked with scale marks, and the center point of the arc-shaped groove is marked as the 0 position of the scale marks and corresponds to the standard value of the diameter of the optical cable sheath. An upper limit proximity switch 3 and a lower limit proximity switch 8 are arranged in the arc-shaped groove, the upper limit proximity switch 3 and the lower limit proximity switch 8 are in signal connection with a control box 10, and an audible and visual alarm, a counter and a reset switch are arranged in the control box 10. When the pointer 4 triggers the upper limit proximity switch 30 or the lower limit proximity switch 8, the two proximity switches can trigger the audible and visual alarm in the control box 10 to act, and count according to the upper limit or the lower limit alarm respectively. The optical cable 6 continuously passes through the monitoring channel, the pinch roller 5 is always elastically pressed on the surface of the optical cable 6, the change of the outer diameter of a sheath of the optical cable pushes the pinch roller 5 to bounce up and down to drive the measuring rod 1 to synchronously rock up and down, the linear action of the measuring rod 1 is converted into the deflection action of the pointer shaft 19 through the duplicate gear, the pointer 4 synchronously deflects, and the scale value indicated by the pointer 4 is the jacket over-differential value.

The measuring rod 1 is sleeved with an upper spring 12 and a lower spring 18, the upper spring 12 is arranged above the rack 15, the lower spring 18 is arranged below the rack 15, and the rack 15 is kept at the center of the shell 11 under the elastic pressure of the upper spring 12 and the lower spring 18. The upper spring 12 and the lower spring 18 are respectively provided with prepressing amounts, the prepressing amounts are 1-2 mm larger than the lower deviation set by the outer diameter of the sheath, and when the outer diameter of the sheath is smaller, the prepressing force of the upper spring 12 pushes the measuring rod 1 to move downwards, so that the pinch roller 5 is in contact with the surface of the optical cable 6.

As shown in fig. 3, a guide piece 13 is further arranged in the housing 11, the guide piece 13 is fixed to the housing 11, the guide piece 13 is arranged opposite to the rack 15, a guide groove is vertically formed in the side surface of the guide piece 13 opposite to the rack 15, the rack 15 is fixedly connected with a rotation-preventing guide rod 14 which is transversely arranged, the end portion of the rotation-preventing guide rod 14 is arranged in the guide groove, when the rack 15 moves up and down, the rack 15 is prevented from being disengaged from the pinion 21, and the guide groove has a limiting effect on the up-and-down movement of the rack 15.

The pointer shaft 19 is sleeved with a return spring, when the pointer shaft 19 is pulled outwards, the return spring is compressed, the pointer gear 20 on the pointer shaft 19 is separated from the large gear 16, the pointer shaft 19 can rotate freely and is in a zero calibration state of the pointer 4, and the pointer shaft 19 is rotated, so that the deflected pointer 4 returns to the '0' position marked on the dial 2. The pointer shaft 19 is released, and the reset spring pushes the pointer shaft 19 to reset, so that the pointer gear 20 and the large gear 16 are meshed again and are in a working state.

This application is through the transmission between rack, duplicate gear and the pointer gear with the displacement volume conversion of the vertical direction of measuring staff and enlarge for circumferencial direction's rotation angle to the contained angle between two spacing proximity switches of accessible adjustment controls, monitors sheath external diameter deviation scope.

A use method of a sheath outer diameter out-of-tolerance monitoring device with audible and visual alarm and counting comprises the following steps, as shown in figure 5:

step one, designing a transmission ratio among the duplicate gear, the rack and the pointer gear, converting the vertical displacement of the measuring bar (namely the upper deviation value and the lower deviation value of the outer diameter of the sheath) into a pointer rotation angle, and marking scale marks on the dial.

And step two, adjusting the positions of the upper limit proximity switch and the lower limit proximity switch according to the scale marks marked on the dial plate, and installing the upper limit proximity switch and the lower limit proximity switch.

And step three, the optical cable is arranged in the monitoring channel of the optical cable, and the pressing wheel is in contact with the surface of the optical cable and keeps a certain prepressing amount.

And step four, pulling the pointer shaft outwards to enable the pointer gear to be disengaged from the duplicate gear and to be in a zero calibration state, rotating the pointer shaft to drive the pointer to rotate to the '0' position marked on the dial plate, and completing the zero calibration of the pointer.

And step five, releasing the pointer shaft, and resetting the pointer shaft under the action of the elastic force of the reset spring so that the pointer gear and the duplicate gear are meshed again.

And sixthly, the optical cable is pulled to move forwards, the pinch roller pushes the measuring rod to move upwards or downwards to drive the rack to move upwards or downwards, and the pointer is driven to do circular motion through the matching of the rack and the duplicate gear, the duplicate gear and the pointer gear.

a. When the outer diameter of the sheath is within the upper deviation value range and the lower deviation value range, the fluctuation of the pointer slightly swings back and forth between the upper limit proximity switch and the lower limit proximity switch but does not cross the upper limit proximity switch and the lower limit proximity switch, namely, the outer diameter of the optical cable sheath does not have the out-of-tolerance phenomenon. At this time, the audible and visual alarm and the counter do not act.

b. When the outer diameter of the sheath exceeds the upper deviation value, the outer diameter of the sheath is increased, the pressing wheel is jacked at the position where the outer diameter of the sheath is increased, the measuring rod is pushed to ascend, and the rack is driven to move upwards; when the outer diameter of the sheath exceeds the lower deviation, the outer diameter of the sheath is reduced, the pre-pressure of the upper spring pushes the measuring rod to descend, so that the pressing wheel is kept in contact with the surface of the optical cable, and the rack is driven to move downwards; the rack on the measuring rod drives the duplicate gear to rotate, and then drives the pointer shaft to rotate, so that the pointer crosses an upper limit proximity switch or a lower limit proximity switch set at the outer diameter limit position, and the upper limit proximity switch or the lower limit proximity switch is triggered. The limit proximity switch triggers an audible and visual alarm and a counter on the control box to act, the audible and visual alarm gives out audible and visual alarms, and the counter counts the triggering number of the lower limit proximity switch or the upper limit proximity switch respectively.

This application is through passing through the rack, the transmission between duplicate gear and the pointer gear is with the displacement volume conversion of the vertical direction of measuring staff and amplify to circumferencial direction's rotation angle, and set up limit switch and lower limit switch in the arc wall, and go up limit proximity switch or lower limit proximity switch and control box signal connection, when the pointer crosses upper limit proximity switch or lower limit proximity switch, go up limit proximity switch or lower limit proximity switch can trigger audible-visual annunciator and the counter in the control box respectively, and the counter can count respectively. The method and the device can monitor the out-of-tolerance condition of the outer diameter of the sheath in real time on line; the device is suitable for the outer diameters of the sheaths with different thicknesses, and the monitoring accuracy is improved.

In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.