CN214121060U

CN214121060U - Stay wire displacement sensor with fault monitoring function

Info

Publication number: CN214121060U
Application number: CN202023214373.9U
Authority: CN
Inventors: 吴志文; 嵇治刚; 吴衡毅
Original assignee: Aerospace South Ocean Zhejiang Science And Technology Co ltd
Current assignee: Aerospace South Ocean Zhejiang Science And Technology Co ltd
Priority date: 2020-12-28
Filing date: 2020-12-28
Publication date: 2021-09-03
Anticipated expiration: 2030-12-28

Abstract

The utility model provides a displacement sensor acts as go-between with fault monitoring function relates to stay cord displacement sensor technical field, comprising a base plate, the spring chamber, dragon hub chamber, detect the chamber, the apron, dragon hub, draw line hole and center pin, the center pin is connected with first bearing and second bearing, the spring chamber is equipped with the first board, second board and spring, it is equipped with detection circuit board to detect the chamber, first gear and the second gear of being connected with first gear engagement, first gear is provided with the magnetic part, detection circuit board is equipped with the second detection circuitry passageway that each other is redundant first detection circuitry passageway and each other is redundant first state monitoring passageway and second state monitoring passageway. The utility model discloses simple structure, displacement sensing measures accurately, can inspect sensor installation and running state, can self-monitoring self running state, adopts the redundant acceleration sensor of double-circuit, and control realizes the closed loop, and operational reliability is high.

Description

Stay wire displacement sensor with fault monitoring function

Technical Field

The utility model relates to the technical field of stay cord displacement sensors,

especially, the utility model relates to a displacement sensor acts as go-between with fault monitoring function.

Background

The pull rope displacement sensor is also called a pull rope sensor, a pull rope electronic ruler and a pull rope encoder. The pull rope displacement sensor is a delicate structure of the linear displacement sensor, fully combines the advantages of an angle sensor and the linear displacement sensor, and is a sensor with small installation size, compact structure, large measurement stroke and high precision, and the stroke is different from hundreds of millimeters to dozens of meters.

The application range of the stay cord displacement sensor is getting larger, and in many dangerous fields, for example, the high tower crane measures the extension length of the front arm through the stay cord displacement sensor, so the requirements on the self state stability and the stability of the detection data of the stay cord displacement sensor are high, for example, chinese patent utility model patent CN210513711U discloses a displacement sensor device acts as go-between, including sensor fixed bolster and bumper shock absorber fixed bolster, sensor fixed bolster can be dismantled the cover and locate act as go-between displacement sensor, the bumper shock absorber fixed bolster can be dismantled the cover and locate on the bumper shock absorber urceolus, sensor fixed bolster the central axis and bumper shock absorber fixed bolster the central axis parallel arrangement and both next-door neighbour fixed connection, sensor couple fixed connection is on the bumper shock absorber mounting point, act as go-between displacement sensor top is provided with pulley gear, act as go-between displacement sensor's act as go-between sliding connection on pulley gear and its one end is connected with the sensor couple. The stay wire displacement sensor device of the utility model is arranged on the shock absorber, and solves the problems of difficult measurement of the jump of the suspension and large error of the measurement result in a road test experiment by a method for measuring the stroke of the shock absorber; the vehicle structure is not damaged; the direction of the stay wire is changed, and a new idea is provided for the measurement of the jumping quantity of the suspension.

However, the structure of the stay wire displacement sensor still has the following problems: the installation and running states of the sensor cannot be frequently checked in the using process, if a fault is sent in the using process, the measured data cannot be correctly returned, so that unnecessary accidents can be caused, meanwhile, along with the continuous improvement of the automation level, the intervention and judgment of an operator during the running of the machine are gradually replaced by automatic judgment, the sensor is required to automatically monitor the running state of the sensor, and under the abnormal working condition before the fault is sent by the sensor, the warning cannot be sent in time; when the sensor sends a fault, an alarm cannot be sent out in time, the system cannot be controlled to realize closed loop, the operation reliability of the system is poor, and equipment faults can be generated due to untimely maintenance of the equipment.

Therefore, in order to solve the above problems, it is necessary to design a reasonably efficient pull-wire displacement sensor with fault monitoring function.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a simple structure, displacement sensing measures accurately, can inspect sensor installation and running state in the use, and correct passback measured data avoids the unnecessary accident, has adopted the redundant acceleration sensor of double-circuit, and the sensor can self-monitoring self running state, and system control realizes the closed loop, and the operational reliability of system is high has the fault monitoring function's displacement sensor that acts as go-between.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a stay wire displacement sensor with a fault monitoring function comprises a bottom plate, a spring cavity arranged on the bottom plate, a hub cavity arranged on the spring cavity, a detection cavity arranged on the hub cavity and a cover plate arranged on the detection cavity, wherein a hub wound with a stay wire is arranged in the hub cavity, a stay wire hole for the stay wire to pass through is formed in the side wall of the hub cavity, the hub is connected with a central shaft, a first bearing for conveniently fixing the central shaft is arranged at the joint of the spring cavity and the hub cavity, a second bearing for conveniently fixing the central shaft is arranged at the joint of the hub cavity and the detection cavity, a first plate, a second plate connected with the central shaft and a spring for connecting the first plate and the second plate are arranged on the spring cavity, a detection circuit board, a first gear and a second gear connected with the central shaft are arranged in the detection cavity, the second gear with first gear engagement is connected, first gear is close to one side of detection circuit board is provided with the magnetic part, be provided with first detection circuitry passageway, second detection circuitry passageway, first state monitoring passageway and second state monitoring passageway on the detection circuit board, first detection circuitry passageway and second detection circuitry passageway are each other redundant, first state monitoring passageway and second state monitoring passageway are each other redundant.

Preferably, the number of the springs is at least one.

As the utility model discloses a preferred, be provided with on the detection circuitry board power supply spare, total control circuit, communication piece and with the communication protection circuit that the communication piece electricity is connected.

As the utility model discloses a preferred, be provided with the mounting hole on the bottom plate, be used for passing the mounting bolt of mounting hole and be used for connecting the bottom plate with the first connecting bolt in spring chamber.

As the utility model discloses a preferred, the quantity of mounting hole, mounting bolt and first connecting bolt all is one at least.

As the utility model discloses a preferred, be provided with on the apron and be used for connecting apron and the second connecting bolt who detects the chamber.

As a preferable aspect of the present invention, the number of the second connecting bolts is at least one.

As the utility model discloses a preferred, be provided with on the detection chamber with the communication cable that the detection circuit board electricity is connected and be used for the convenience the cable hole that communication cable passed.

Preferably, the outer diameter of the first gear is not smaller than the outer diameter of the second gear.

The utility model relates to a displacement sensor acts as go-between with fault monitoring function's beneficial effect lies in: the double-path redundant acceleration sensor has the advantages that the structure is simple, the displacement sensing measurement is accurate, the installation and running states of the sensor can be checked in the using process, the measured data can be correctly transmitted back, unnecessary accidents are avoided, the double-path redundant acceleration sensor is adopted, the sensor can automatically monitor the running state of the sensor, the system control realizes closed loop, and the running reliability of the system is high.

Drawings

Fig. 1 is a schematic overall structure diagram of an embodiment of the pull-wire displacement sensor with a fault monitoring function according to the present invention;

fig. 2 is a schematic block diagram of a detection circuit board of an embodiment of the pull-wire displacement sensor with fault monitoring function according to the present invention;

in the figure: 1. a bottom plate, 2, a mounting hole, 21, a mounting bolt, 3, a spring cavity, 41, a first plate, 42, a second plate, 43, a spring, 5, a dragon hub, 6, a dragon hub cavity, 7, a detection cavity, 8, a cover plate, 81, a second connecting bolt, 9, a detection circuit board, 91, a power supply piece, 92, a first detection circuit channel, 93, a second detection circuit channel, 94, a master control circuit, 95, a first state monitoring channel, 96, a second state monitoring channel, 97, a communication piece, 98, a communication protection circuit, 10, a magnetic piece, 11, a first gear, 12, a second gear, 13, a cable hole, 131, a communication cable, 141, a first bearing, 142, a second bearing, 15, a wire pulling hole, 151, a wire pulling, 16, a central shaft, 17, and a first connecting bolt.

Detailed Description

The following are specific embodiments of the present invention, and the technical solutions of the present invention are further described, but the present invention is not limited to these embodiments.

Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of modules and steps and the steps set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.

Meanwhile, it should be understood that the flows in the drawings are not merely performed individually for convenience of description, but a plurality of steps are performed alternately with each other.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship which the product of the present invention is usually placed when in use, and are only for convenience of description of the present invention and simplification of description, but do not indicate or imply that the device or element referred to must have a specific position, be constructed and operated in a specific orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

Techniques, methods, and systems known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

The first embodiment is as follows: as shown in fig. 1 and 2, which are only one of the embodiments of the present invention, a pull wire displacement sensor with fault monitoring function includes a bottom plate 1, a spring cavity 3 on the bottom plate 1, a hub cavity 6 on the spring cavity 3, a detection cavity 7 on the hub cavity 6 and a cover plate 8 on the detection cavity 7, a hub 5 around a pull wire 151 is disposed in the hub cavity 6, a pull wire hole 15 for facilitating the pull wire 151 to pass through is disposed on a sidewall of the hub cavity 6, the hub 5 is connected to a central shaft 16, a first bearing 141 for facilitating fixing the central shaft 16 is disposed at a connection between the spring cavity 3 and the hub cavity 6, a second bearing 142 for facilitating fixing the central shaft 16 is disposed at a connection between the hub cavity 6 and the detection cavity 7, a first plate 41 is disposed on the spring cavity 3, The detection device comprises a second plate 42 connected with the central shaft 16 and a spring 43 used for connecting the first plate 41 and the second plate 42, wherein a detection circuit board 9, a first gear 11 and a second gear 12 connected with the central shaft 16 are arranged in the detection cavity 7, the second gear 12 is meshed with the first gear 11, a magnetic part 10 is arranged on one side, close to the detection circuit board 9, of the first gear 11, a first detection circuit channel 92, a second detection circuit channel 93, a first state monitoring channel 95 and a second state monitoring channel 96 are arranged on the detection circuit board 9, the first detection circuit channel 92 and the second detection circuit channel 93 are redundant, and the first state monitoring channel 95 and the second state monitoring channel 96 are redundant.

The utility model discloses in, whole device is from last to being bottom plate 1 down in proper order, spring chamber 3, dragon hub chamber 6, detect chamber 7 and

apron

8, 1 fixed settings of bottom plate, it is provided with the elasticity base to be provided with in the spring chamber 3, be provided with dragon hub 5 in the dragon hub chamber 6, it is provided with electromagnetism piece 10 and detection circuitry board 9 to detect intracavity 7, when drawing wire 151 pulls out, drive dragon hub 5 and rotate, thereby drive center pin 16 and second gear 12 and rotate, finally make first gear 11 rotate and drive electromagnetism piece 10 cutting magnetic field, make the interior signal of telecommunication that produces of detection circuitry board 9, measure the data that drawing wire 151 pulled out.

Firstly, the structure part is provided, a dragon hub 5 wound with a pull wire 151 is arranged in a dragon hub cavity 6, the side wall of the dragon hub cavity 6 is provided with a pull wire hole 15 for facilitating the pull wire 151 to pass through, the dragon hub 5 is connected with a central shaft 16, a first bearing 141 for facilitating the fixing of the central shaft 16 is arranged at the joint of a spring cavity 3 and the dragon hub cavity 6, a second bearing 142 for facilitating the fixing of the central shaft 16 is arranged at the joint of the dragon hub cavity 6 and a detection cavity 7, a first plate 41, a second plate 42 connected with the central shaft 16 and a spring 43 connected with the first plate 41 and the second plate 42 are arranged on the spring cavity 3, a detection circuit board 9, a first gear 11 and a second gear 12 connected with the central shaft 16 are arranged in the detection cavity 7, and the second gear 12 is meshed with the first gear 11.

Here, the pull wire 151 passes through the pull wire hole 15 to be pulled out and retracted to drive the dragon hub 5 to rotate, the central shaft 16 is coaxially connected with the dragon hub 5, the lower end of the central shaft 16 extends into the spring cavity 3 through the first bearing 141, the second plate 42 is arranged on one side of the first plate 41 close to the central shaft 16 through the spring 41, the lower end of the central shaft 16 is tightly attached to the upper surface of the second plate 42, and the second plate 42 elastically supports the central shaft 16 similarly to an elastic base; the upper end of the central shaft 16 extends to the detection cavity 7 through the second bearing 142, the upper end of the central shaft 16 is fixedly provided with the second gear 12, and when the pull wire 151 is pulled out, the second gear 12 drives the first gear 11 to rotate in a meshed mode.

Of course, the hub 5, the second gear 12, the central shaft 16, the first bearing 141 and the second bearing 142 are all coaxially disposed.

Then, a data measuring part is provided, a magnetic part 10 is arranged on one side of the first gear 11 close to the detection circuit board 9, a first detection circuit channel 92, a second detection circuit channel 93, a first state monitoring channel 95 and a second state monitoring channel 96 are arranged on the detection circuit board 9, and the first detection circuit channel 92 and the second detection circuit channel 93 are mutually redundant; both the first and second

condition monitoring channels

95, 96 are redundant of each other.

It should be noted that two groups of channels that are redundant to each other are disposed together or adjacently, the detection data of the two groups of channels are the same or in a direct proportion relationship, and once the two groups of channels have errors, the system detection is abnormal. When the first gear 11 rotates, the electromagnetic element 10 moves, an electrical signal is generated in the detection circuit board 9, and a circuit in the detection circuit board 9 includes a first detection circuit channel 92 and a second detection circuit channel 93 which are redundant with each other, and a first state monitoring channel 95 and a second state monitoring channel 96 which are redundant with each other, so that two sets of two channels which are redundant with each other are formed.

Here, the first detection circuit path 92 and the second detection circuit path 93 are designed in complementary patterns, which are redundant to each other, to achieve reliable measurement of the length of the pull wire. The first state monitoring channel 95 and the second state monitoring channel 96 are designed with two digital acceleration circuits, and the two digital acceleration circuits have functions of measuring the attitude of the sensor and monitoring the vibration condition of the sensor at the same time. Namely, the first state monitoring channel 95 and the second state monitoring channel 96 which are redundant to each other are used for detecting the placement angle of the sensor and the vibration condition during working; the first detection circuit channel 92 and the second detection circuit channel 93, which are redundant to each other, are used for detecting the sensor output signal when the pull wire is pulled out.

When the sensor uses back center pin 16 for a long time and takes place wearing and tearing, the bolt of fixed sensor takes place to become flexible or spring 43, dragon hub 5 work is unusual, through the angle of placing of first state monitoring channel 95 and second state monitoring channel 96 monitoring sensor and the vibration condition of during operation (be redundant binary channels data error grow each other promptly), when taking place above-mentioned problem, explain equipment running state is abnormal state, the sensor sends warning instruction (warning instruction) to the host computer this moment, operating personnel should sensor or equipment maintain, prevent that equipment from further damaging.

When the central shaft 16 is seriously worn and seriously deviates or breaks after the sensor is used for a long time, and transmission when the pull wire 151 is pulled out cannot drive the first gear 11 to rotate, the first detection circuit channel 92 and the second detection circuit channel 93 which are redundant with each other in the detection circuit board 9 measure data abnormity (namely, the data error of the two channels which are redundant with each other is increased), an abnormity alarm is sent to the upper computer, and the system stops acting immediately.

Like this, adopt two redundant acquisition circuit, improved acquisition circuit's reliability to two kinds of functions of data acquisition and fault monitoring have been realized through function multiplexing, adopted two-way redundant acceleration sensor, through real-time acquisition sensor angle, vibration characteristic value, automatic judgement sensor running state sends out the warning in trouble earlier stage, sends out the police dispatch newspaper when breaking down.

Here, the warning signal is slightly lighter than the alarm signal, and the warning signal reminds a worker to maintain the sensor; if the alarm signal is yes, the worker is prompted to carry out maintenance immediately under the condition that the condition is critical.

Finally, it should be noted that the detection circuit board 9 is provided with a power supply part 91, a master control circuit 94, a communication part 97 and a communication protection circuit 98 electrically connected to the communication part 97, the detection cavity 7 is provided with a communication cable 131 electrically connected to the detection circuit board 9 and a cable hole 13 for facilitating the communication cable 131 to pass through, and the communication cable 131 is actually electrically connected to the communication part 97. The power supply piece 91 is used for supplying power for the whole detection circuit board 9, the master control circuit 94 is used for controlling the opening and closing of the detection circuit board 9, the communication piece 97 is used for sending a detection signal of the detection circuit board 9 to an upper computer through the communication cable 131, the sensor is communicated with the upper computer through a CANOPEN protocol, sensor measurement data are sent to the upper computer through a data uploading ID, and a sensor fault reminding and fault alarm instruction is sent to the upper computer through a warning ID.

The CAN-OPEN protocol is communicated with the upper computer, and a mode that the data ID and the warning ID are separated is adopted, so that the upper computer CAN conveniently manage the sensor

In a word, the utility model relates to a pull wire displacement sensor with fault monitoring function carries out the self-checking earlier when using after the installation, ensures that dragon hub 5, center pin 16, first gear 11 and second gear 12 connect normally, then carries out normal work, pulls the acting as go-between 151, and dragon hub 5 rotates, drives magnetic part 10 on first gear 11 and rotates, makes detection circuit board 9 produce the signal of telecommunication; at this time, the measurement data of the first state monitoring channel 95 and the second state monitoring channel 96 on the detection circuit board 9 are firstly obtained to obtain a first contrast value, and whether the first contrast value is greater than a first threshold value or not is judged, if yes, the state of the sensor is not good, a warning needs to be sent out to prompt the sensor to be maintained, and further damage of equipment is prevented; otherwise, no warning is required to be sent, the measurement data of the first detection circuit channel 92 and the second detection circuit channel 93 on the detection circuit board 9 are obtained, a second contrast value is obtained, whether the second contrast value is larger than a second threshold value or not is judged, if yes, the operation fault of the sensor is indicated, and the warning is required to be carried out for timely maintenance; otherwise, the sensor operates normally, and the electric signal of the detection circuit board 9 is uploaded to acquire and measure the pulling value of the pull wire 151.

The utility model relates to a stay wire displacement sensor with fault monitoring function's simple structure, displacement sensing measurement is accurate, can inspect sensor installation and running state in the use, and correct passback measured data avoids the unnecessary accident, has adopted the redundant acceleration sensor of double-circuit, and the sensor can self-monitoring self running state, and system control realizes the closed loop, and the operational reliability of system is high.

Embodiment two, still as shown in fig. 1 and 2, is only one of the embodiments of the present invention, and on the basis of embodiment one, in the stay wire displacement sensor with the fault monitoring function of the present invention, the number of the springs 43 is at least one, so as to ensure the connection stability between the first plate 41 and the second plate 42.

In addition, the bottom plate 1 is provided with a mounting hole 2, a mounting bolt 21 for passing through the mounting hole 2, and a first connecting bolt 17 for connecting the bottom plate 1 and the spring cavity 3. The floor 1 is mounted on the ground (or a device to be used) through the mounting hole 2 by the mounting bolt 21, and the connection between the bottom plate 1 and the spring chamber 3 is completed by the first connecting bolt 17.

Here, the number of the mounting holes 2, the mounting bolts 21, and the first connecting bolts 17 is at least one. The stability of the base plate 1 and the spring chamber 3 is better.

Similarly, be provided with on the apron 8 and be used for connecting apron 8 and the second connecting bolt 81 that detects chamber 7, of course, the quantity of second connecting bolt 81 is at least one, accomplishes through second connecting bolt 81 with apron 8 and detection chamber 7 and is connected, and connection stability is better.

Finally, the outer diameter of the first gear 11 is not smaller than the outer diameter of the second gear 12, and generally the first gear 11 is larger than the outer diameter of the second gear 12, so that the first gear 11 rotates at a lower angular velocity than the second gear 12 when the first gear 11 and the second gear 12 rotate at the same linear velocity, so that the first gear 11 decelerates when the wire is drawn out at a high speed.

The third embodiment of the present invention further provides a method for using the pull wire displacement sensor with fault monitoring function in all the above embodiments, which includes the following steps:

s1: self-checking is carried out to ensure that the dragon hub, the central shaft, the first gear and the second gear are normally connected;

s2: pulling the pull wire, the dragon hub rotates to drive the magnetic part on the first gear to rotate, and the detection circuit board generates an electric signal;

s3: acquiring measurement data of a first state monitoring channel and a second state monitoring channel on a detection circuit board to obtain a first contrast value;

s4: judging whether the first contrast value is larger than a first threshold value or not, and if so, sending out a warning; otherwise, go to step S5;

s5: acquiring measurement data of a first detection circuit channel and a second detection circuit channel on a detection circuit board to obtain a second contrast value;

s6: judging whether the second contrast value is larger than a second threshold value or not, and if so, giving an alarm; otherwise, the detection circuit board is uploaded for telecommunication.

The present invention is not limited to the above-described specific embodiments, and various modifications and changes are possible. Any modification, equivalent replacement, improvement and the like made to the above embodiments according to the technical spirit of the present invention should be included in the scope of protection of the present invention.

Claims

1. The utility model provides a displacement sensor of acting as go-between with fault monitoring function which characterized in that: including bottom plate (1), set up in spring chamber (3) on bottom plate (1), set up in dragon hub chamber (6) on spring chamber (3), set up in detect chamber (7) on dragon hub chamber (6) and set up in detect apron (8) on chamber (7), be provided with in dragon hub chamber (6) around being equipped with longhuo (5) of acting as go-between (151), dragon hub chamber (6) lateral wall is provided with and is used for the convenience act as go-between (15) that act as go-between (151) passed, dragon hub (5) are connected with center pin (16), spring chamber (3) are provided with dragon hub chamber (6) junction and are used for conveniently fixing first bearing (141) of center pin (16), dragon hub chamber (6) and detection chamber (7) junction are provided with and are used for conveniently fixing second bearing (142) of center pin (16), be provided with first board (41) on spring chamber (3), A second plate (42) connected to the central shaft (16) and a spring (43) for connecting the first plate (41) and the second plate (42), a detection circuit board (9), a first gear (11) and a second gear (12) connected with the central shaft (16) are arranged in the detection cavity (7), the second gear (12) is meshed with the first gear (11), a magnetic part (10) is arranged on one side of the first gear (11) close to the detection circuit board (9), the detection circuit board (9) is provided with a first detection circuit channel (92), a second detection circuit channel (93), a first state monitoring channel (95) and a second state monitoring channel (96), the first detection circuit channel (92) and the second detection circuit channel (93) are redundant to each other, the first condition monitoring channel (95) and the second condition monitoring channel (96) are redundant of each other.

2. The pull-wire displacement sensor with fault monitoring function according to claim 1, characterized in that: the number of the springs (43) is at least one.

3. The pull-wire displacement sensor with fault monitoring function according to claim 1, characterized in that: the detection circuit board (9) is provided with a power supply piece (91), a master control circuit (94), a communication piece (97) and a communication protection circuit (98) electrically connected with the communication piece (97).

4. The pull-wire displacement sensor with fault monitoring function according to claim 1, characterized in that: the spring cavity is characterized in that the bottom plate (1) is provided with a mounting hole (2), a mounting bolt (21) used for penetrating through the mounting hole (2) and a first connecting bolt (17) used for connecting the bottom plate (1) and the spring cavity (3).

5. The stay wire displacement sensor with fault monitoring function according to claim 4, wherein: the number of the mounting holes (2), the mounting bolts (21) and the first connecting bolts (17) is at least one.

6. The pull-wire displacement sensor with fault monitoring function according to claim 1, characterized in that: and a second connecting bolt (81) for connecting the cover plate (8) and the detection cavity (7) is arranged on the cover plate (8).

7. The pull-wire displacement sensor with fault monitoring function according to claim 6, characterized in that: the number of the second connecting bolts (81) is at least one.

8. The pull-wire displacement sensor with fault monitoring function according to claim 1, characterized in that: the detection cavity (7) is provided with a communication cable (131) electrically connected with the detection circuit board (9) and a cable hole (13) for allowing the communication cable (131) to pass through conveniently.

9. The pull-wire displacement sensor with fault monitoring function according to claim 1, characterized in that: the outer diameter of the first gear (11) is not smaller than the outer diameter of the second gear (12).