CN211824982U

CN211824982U - Inflation monitoring devices and system

Info

Publication number: CN211824982U
Application number: CN202020396342.0U
Authority: CN
Inventors: 璐句匠; 贾佳
Original assignee: Individual
Current assignee: Lanzhou Qitian Chuanggao Information Technology Co ltd
Priority date: 2020-03-25
Filing date: 2020-03-25
Publication date: 2020-10-30
Anticipated expiration: 2030-03-25

Abstract

The utility model discloses an expansion monitoring device and a system, wherein the expansion monitoring device comprises a detection component and a plurality of variable components arranged on an object to be detected, and the detection component can acquire the displacement of the variable components; the detection assembly comprises a main body frame, a probe bracket arranged on the main body frame and a displacement sensor arranged on the probe bracket; the number of the displacement sensors is at least three, and the displacement of the variable component in the X, Y, Z direction is respectively obtained; the main body framework at least comprises three plate bodies which are vertical to each other in pairs, each plate body is at least provided with a probe support, one end of each probe support is arranged on the plate body in an adjustable mode, and the displacement sensor is arranged at the other end of each probe support. The utility model provides an inflation monitoring devices utilizes detecting element and change group through acquireing every change subassembly at X, Y, Z ascending displacement volume of side, comes the accuracy to acquire and is detected the inflation volume of thing in the equidirectional not, improves inflation monitoring precision.

Description

Inflation monitoring devices and system

Technical Field

The utility model relates to a examination strip check out test set field especially relates to an inflation monitoring devices. Furthermore, the utility model discloses still relate to an inflation monitoring system including above-mentioned inflation monitoring devices.

Background

Currently, boiler expansion monitoring still mainly records data of a mechanical expansion device, and computer remote monitoring in the true sense is not realized. The reason is that there are several aspects:

one is that the measurement problem is not solved at all. At present, the multi-dimensional measurement scheme for boiler expansion is more, but most of the measurement schemes are simple in principle, inconvenient to install and implement, high in cost and difficult to popularize.

And secondly, the load of the boiler of the conventional power plant is relatively stable, so that the expansion times and the expansion amplitude of the boiler are relatively small, and the monitoring and analysis urgency on the expansion of the boiler is not high. However, with the change of the grid structure, the load of the boiler of the thermal power plant frequently changes from 30% to 100%, and even the boiler needs to be frequently started and stopped, so that the frequency and the amplitude of expansion of the boiler are greatly increased. Under the condition, continuous monitoring and analysis on boiler expansion of the power plant are urgently needed, the operation condition of the boiler is mastered, and the service life and the health condition of metal are analyzed, so that data support is provided for optimizing the overhauling frequency of the boiler and key inspection positions.

Thirdly, the number of expansion monitoring points of the large boiler is large, so that the number of data acquisition points is large, more cables and I/O (input/output) clamping pieces are required to be consumed, and the cost cannot be effectively reduced.

In addition, in the prior art, the expansion of the boiler can be measured by an ultrasonic displacement sensor and a laser displacement sensor, and can also be measured by an LVDT displacement sensor. When using a conventional LVDT sensor, the rod of the LVDT needs to be fixed at one end to a displacement varying member and at the other end to a relatively fixed member via a universal joint. When the position of the movable component changes, the LVDT pull rod stretches and retracts, and meanwhile the pull rod drives the LVDT to integrally move in position so as to ensure that the LVDT is always vertical to the displacement change component. The function of the universal joint is to ensure that the fixed end of the LVDT can move horizontally on the plane vertical to the displacement variation component, thereby accurately measuring the vertical distance. However, the pull rod drives the LVDT to move transversely, so that transverse force is generated, the pull rod is bent and deformed after long-term use, and the conventional universal joint can move in multiple directions, but the flexible movement is difficult to ensure, and the LVDT and the displacement variable component are always kept perpendicular. The other mode is to use a rebound type LVDT to measure the displacement, but the head of the existing rebound type LVDT is in a hard contact mode, and transverse friction is generated in the measuring process, so that the measuring rod is abraded and bent to deform, and the measuring accuracy is influenced.

Therefore, how to improve the detection accuracy and the installation convenience of the expansion monitoring device is a technical problem that needs to be solved by those skilled in the art at present.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing an inflation monitoring devices, this inflation monitoring devices can accurately acquire the inflation volume of measuring point, improves and detects the precision. Another object of the present invention is to provide an inflation monitoring system comprising the above inflation monitoring device.

In order to achieve the above object, the utility model provides a following technical scheme:

an expansion monitoring device comprises a detection component and a plurality of variable components arranged on an object to be detected, wherein the detection component can acquire the displacement of the variable components; the detection assembly comprises a main body frame, a probe bracket arranged on the main body frame and a displacement sensor arranged on the probe bracket; the number of the displacement sensors is at least three, and the displacement of the variation assembly in the X, Y, Z direction is respectively obtained; the main body framework at least comprises three plate bodies which are perpendicular to each other, each plate body is at least provided with a probe support, one end of each probe support is arranged on the corresponding plate body in an adjustable mode, and the displacement sensor is arranged at the other end of each probe support.

Preferably, an arc-shaped groove is formed in the plate body, a strip-shaped groove is formed in the probe bracket, and the length of the strip-shaped groove is larger than the radius of the arc-shaped groove; the probe bracket can be followed the arc wall swing, just the arc wall with the crossing department in bar groove can be followed the extending direction in bar groove removes.

Preferably, a center hole is formed in the plate body and located at the circle center of the arc-shaped groove, and the intersection of the center hole and the strip-shaped groove of the probe bracket is rotatably connected.

Preferably, the strip-shaped groove is connected with the central hole through a first connecting piece, and the intersection of the strip-shaped groove and the arc-shaped groove is connected through a second connecting piece.

Preferably, the plate bodies are right-angled triangular plate bodies, and the right-angled sides of the right-angled triangular plate bodies are connected in sequence; the main body frame is connected with a frame fixing rod; a triangular plane is arranged at the intersection of the plate bodies of the main body frame, and the frame fixing rod is installed on the triangular plane; or the frame fixing rod is arranged at the joint of the two right-angled triangular plate bodies, and the extending direction of the frame fixing rod is parallel to the connecting side

Preferably, the shifting assembly comprises a displacement shifting block and a shifting block fixing rod, and the shifting block fixing rod is mounted on the detected object; the displacement variable block is in a cuboid shape or is formed by vertically welding three rectangular plates in pairs, the detection assembly is positioned at the corner of the displacement variable block, and three surfaces at the corner of the displacement variable block correspond to at least one displacement sensor.

Preferably, the displacement sensor is a laser displacement sensor or an ultrasonic displacement sensor;

or, the displacement sensor is a rebound type linear displacement sensor, a ball is arranged at the end part of the rebound type linear displacement sensor, and the ball abuts against the variable assembly.

An inflation monitoring system comprises an inflation monitoring device, wherein the inflation monitoring device is the inflation monitoring device.

Preferably, the expansion monitoring instrument is used for transmitting and displaying expansion data, can supply power to the displacement sensor, and sends out an alarm signal when the displacement sensor fails.

Preferably, the expansion monitoring instrument is connected with the expansion monitoring device, the server and the controller, the server is used for converting the displacement into the expansion of the detected object, and the controller is used for acquiring and storing temperature and pressure information of each monitoring point in the detected object and storing the displacement.

The utility model also provides an inflation monitoring system, including above-mentioned arbitrary one inflation monitoring devices.

The utility model provides an expansion monitoring device, which comprises a detection component and a plurality of variable components arranged on the detected object, wherein the detection component can obtain the displacement of the variable components; the detection assembly comprises a main body frame, a probe bracket arranged on the main body frame and a displacement sensor arranged on the probe bracket; the number of the displacement sensors is at least three, and the displacement of the variation assembly in the X, Y, Z direction is respectively obtained; the main body framework at least comprises three plate bodies which are perpendicular to each other, each plate body is at least provided with a probe support, one end of each probe support is arranged on the corresponding plate body in an adjustable mode, and the displacement sensor is arranged at the other end of each probe support. The utility model provides an inflation monitoring devices, the change subassembly is followed by the inflation that is detected the thing and remove, the determine module is through acquireing the displacement volume that changes the subassembly acquires the inflation volume that is detected the thing, simultaneously, through acquireing every change the subassembly at X, Y, Z ascending displacement volume of side, come the accuracy to acquire by the inflation volume of detected the thing in the equidirectional not, improve inflation monitoring accuracy.

In a preferred embodiment, the shifting unit includes a displacement shifting block and a shifting block fixing rod, and the shifting block fixing rod is mounted on the detected object; the displacement variable block is in a cuboid shape or is formed by vertically welding three rectangular plates in pairs, the detection assembly is positioned at the corner of the displacement variable block, and three surfaces at the corner of the displacement variable block correspond to at least one displacement sensor. With the arrangement, the displacement of the displacement change block in the direction X, Y, Z can be accurately and efficiently acquired only by arranging the detection component at the corner of the displacement change block, so that the detection component is convenient to mount.

The utility model provides an inflation monitoring system is equipped with above-mentioned inflation monitoring devices, because inflation monitoring devices has above-mentioned technological effect, consequently, the inflation monitoring system who is equipped with this inflation monitoring devices should also have corresponding technological effect.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an assembly structure of an embodiment of an expansion monitoring device provided by the present invention;

fig. 2-1 is a schematic diagram of an external structure of a detection assembly in the inflation monitoring device provided by the present invention;

fig. 2-2 is a schematic diagram of an internal structure of a detection assembly in the inflation monitoring device provided by the present invention;

fig. 2-3 are schematic top end views of the detection assembly of the inflation monitoring device provided by the present invention;

fig. 2-4 are schematic front views of another embodiment of a detection assembly in an expansion monitoring device according to the present invention;

fig. 2-5 are schematic structural views of another embodiment of a variable assembly in an inflation monitoring device according to the present invention;

fig. 3 is a schematic structural diagram of a probe holder of a detection assembly in an expansion monitoring device according to the present invention;

fig. 4 is a schematic structural diagram of a resilient linear displacement sensor of a detection assembly in the expansion monitoring device provided by the present invention;

fig. 5 is a schematic structural diagram of an expansion monitoring system provided by the present invention;

wherein: the device comprises a detection assembly-100, a main body frame-101, a probe bracket-102, a frame fixing rod-103, a first connecting piece-104 and a second connecting piece-105; a variable assembly-200, a displacement variable block-201 and a variable block fixing rod-202; displacement sensor-300, rolling ball-301, server-400 and controller-500.

Detailed Description

The core of the utility model is to provide an inflation monitoring devices, this inflation monitoring devices can accurately acquire the inflation volume of measuring point, improves and detects the precision. The utility model discloses a another core provides an inflation monitoring system including above-mentioned inflation monitoring devices.

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

Referring to fig. 1 to 5, fig. 1 is an assembly structure diagram of an embodiment of an expansion monitoring device according to the present invention; fig. 2-1 is a schematic diagram of an external structure of a detection assembly in the inflation monitoring device provided by the present invention; fig. 2-2 is a schematic diagram of an internal structure of a detection assembly in the inflation monitoring device provided by the present invention; fig. 2-3 are schematic top end views of the detection assembly of the inflation monitoring device provided by the present invention; fig. 2-4 are schematic front views of another embodiment of a detection assembly in an expansion monitoring device according to the present invention; fig. 2-5 are schematic structural views of another embodiment of a variable assembly in an inflation monitoring device according to the present invention; fig. 3 is a schematic structural diagram of a probe holder of a detection assembly in an expansion monitoring device according to the present invention; fig. 4 is a schematic structural diagram of a resilient linear displacement sensor of a detection assembly in the expansion monitoring device provided by the present invention; fig. 5 is a schematic structural diagram of an expansion monitoring system provided by the present invention.

In this embodiment, the inflation monitoring device includes a detection assembly 100 and a variation assembly 200.

The variable component 200 is mounted on the object to be detected, a plurality of expansion measurement points are arranged on the object to be detected, the variable component 200 is mounted on each expansion measurement point, when the expansion measurement points of the object to be detected expand, the position of the variable component 200 changes accordingly, and the detection component 100 acquires the expansion condition of the object to be detected by acquiring the displacement of the variable component 200.

Specifically, the sensing assembly 100 includes a main body frame 101, a probe holder 102, and a displacement sensor 300. The main body frame 101 is used for installing the probe bracket 102, the probe bracket 102 is used for installing the displacement sensor 300, and the displacement of the main body frame 101 should be fixed, for example, the main body frame 101 can be directly welded on a boiler steel frame, and can also be used as an extension member of the fixed part of the existing mechanical boiler expansion monitor and connected with the boiler steel frame; the number of the displacement sensors 300 is at least three, and the displacement amount of the varying element 200 in the direction X, Y, Z is acquired, so that the detection element 100 becomes a multi-dimensional displacement detection element 100, and the detection accuracy is improved.

Further, the shifting assembly 200 may be directly welded to the boiler expansion member or may be an extension of the movable finger portion of the original mechanical boiler expansion monitor and connected thereto.

Specifically, the object to be detected may be a boiler, or an accessory device such as a steam pipe, a water supply pipe and a related header related to the boiler.

Further, the main frame 101 at least includes three plate bodies perpendicular to each other, each plate body is hinged with at least one probe support 102, one end of the probe support 102 is adjustably disposed on the plate body, the displacement sensor 300 is mounted at the other end of the probe support 102, and the probe support 102 should be fixed to the main frame 101 after being adjusted to the optimal position.

The utility model provides an inflation monitoring devices, change subassembly 200 and follow the inflation that is detected the thing and remove, detection component 100 acquires the inflation volume that is detected the thing through the displacement volume that acquires change subassembly 200, simultaneously, through acquireing every displacement volume that changes subassembly 200 in X, Y, Z side, comes the accuracy to acquire to be detected the inflation volume of thing in the equidirectional not, improves inflation monitoring accuracy.

On the basis of the above embodiments, an arc-shaped groove is formed on the plate body, a strip-shaped groove is formed on the probe bracket 102, and the length of the strip-shaped groove is greater than the radius of the arc-shaped groove; the probe bracket 102 can swing along the arc-shaped groove, and the intersection of the arc-shaped groove and the strip-shaped groove can move along the extending direction of the strip-shaped groove.

By such arrangement, the angle adjustment of the probe bracket 102 and the adjustment of the relative displacement with the main body frame 101 can be realized, and further, the position of the displacement sensor 300 can be adjusted, so that the displacement sensor 300 is in the best detection position.

Furthermore, a center hole is formed in the plate body and located at the center of the arc-shaped groove, and the center hole is rotatably connected with the intersection of the strip-shaped groove of the probe support 102, so that the probe support 102 can swing conveniently, and angle adjustment is achieved.

Preferably, the strip-shaped groove and the central hole are fixed through a first connecting piece 104, and the intersection of the strip-shaped groove and the arc-shaped groove is fixed through a second connecting piece 105. Preferably, the first connecting member 104 and the second connecting member 105 are both screw and nut mating members.

On the basis of the above embodiments, the plate body is a right-angled triangular plate body, and the right-angled sides of the right-angled triangular plate body are connected in sequence; a triangular plane is arranged at the intersection of the plate bodies of the main body frame 101, and a frame fixing rod 103 is arranged on the triangular plane.

Alternatively, the frame fixing rod 103 is installed at the joint of two right-angled triangular plate bodies, and the extending direction of the frame fixing rod 103 is parallel to the connecting side, as shown in fig. 2-4. Of course, the frame fixing rod 103 may be installed at other positions, and in this embodiment, a triangular plane does not need to be provided at the plate body intersection of the main body frame 101.

Specifically, the main frame 101 is used as a fixing support of the multi-dimensional displacement sensor 300, and includes three orthogonal metal plates to form the main frame 101, and the three metal plates are rigidly welded, that is, three right-angled triangles are welded together. An arc-shaped groove is designed on each metal plate, a center hole is formed in the center of the arc-shaped groove, and a probe support 102 is respectively installed on the center hole. The probe holder 102 is used to mount the displacement sensor 300 thereon, and specifically, the displacement sensor 300 may be fixed thereon by screws, or may be fixed thereon in other manners, depending on the structure of the displacement sensor 300, but the displacement sensor 300 should be perpendicular to the corresponding surface of the displacement varying block 201. A rectangular groove is formed at the fixed end of the probe holder 102, the junction of the three metal plates of the main body frame 101 is formed as a triangular plane as shown in fig. 2 to 3, and a metal bar, i.e., a frame fixing bar 103, is welded thereto for fixing the main body frame 101 to a target member. The probe holder 102 can be rotated about the center hole, and can be adjusted in the front-rear direction. When the position of the probe holder 102 is determined, the probe holder 102 can be fixed to the main body frame 101 by the first connector 104 and the first connector 104; the specific method comprises the following steps: one screw penetrates through the intersection of the central hole of the main body frame 101 and the rectangular groove of the probe bracket 102, the other screw penetrates through the intersection of the rectangular groove of the probe bracket 102 and the arc-shaped groove of the main body frame 101, and the two screws are tightened by using connecting nuts respectively. When the position of the probe bracket 102 needs to be adjusted, the two nuts are loosened.

In addition to the above embodiments, the variable unit 200 includes a displacement variable block 201 and a variable block fixing rod 202, and the variable block fixing rod 202 is attached to the object to be detected; the displacement variation block 201 is in a rectangular parallelepiped shape as shown in fig. 1, or is formed by vertically welding three rectangular plates two by two as shown in fig. 2-5, the detection assembly 100 is located at a corner of the displacement variation block 201, and three surfaces at the corner of the displacement variation block 201 correspond to at least one displacement sensor 300.

Preferably, the multidimensional displacement variation block 201 is a rectangular or cubic hollow metal block, and of course, other structures can be formed with three surfaces perpendicular to each other; a metal rod is welded at the center of one plane of the displacement varying block 201 for fixing the displacement varying block 201 on a target member, and when the displacement varying block 201 is formed by vertically welding three rectangular plates two by two, the metal rod may be welded at one of the joints.

Above-mentioned setting, through the setting of displacement change piece 201, only need set up detecting element 100 in displacement change piece 201's corner, alright obtain displacement change piece 201 in X, Y, Z ascending displacement volume of direction with accurate efficient, be convenient for install detecting element 100.

In addition to the above embodiments, the displacement sensor 300 is a non-contact sensor such as a laser displacement sensor or an ultrasonic displacement sensor, but of course, the displacement sensor 300 may be a rebound linear displacement sensor, and a ball is provided at an end of the rebound linear displacement sensor and abuts against the variable assembly 200.

Specifically, the displacement sensor 300 is mounted on the probe holder 102 of the main body frame 101, and the displacement sensor 300 may be a resilient LVDT. The fixed end of the rebound type LVDT provided by the embodiment is fixed on the probe support 102, the position of the rebound type LVDT is fixed, the rebound type pull rod abuts against one surface of the displacement variable block 201 and keeps vertical, and the expansion variable block is generally arranged at four corners of the boiler in the expansion process of the boiler, and the expansion of the expansion variable block does not have rotary displacement, so that the rebound type LVDT is always vertical to the probe support 102 of the displacement measuring device. When the boiler expands unevenly, the expansion block rotates by a small displacement, and the probe holder 102 is expected to be still approximately vertical, so the influence on the measurement result is negligible. In order to ensure that the contact surface of the pull rod and the displacement change block 201 does not generate hard destructive friction, a ball 301 is added at the head of the pull rod to meet the requirement of the displacement change block 201 on transverse movement, and the head of the probe rod is designed into the form of the ball 301 to avoid the deformation of the pull rod caused by strong transverse friction. At this time, although the displacement change block 201 generates transverse displacement, the pull rod is always vertical to the plane of the displacement change block, so that equipment abrasion and pull rod deformation caused by hard friction when the horizontal position changes are eliminated; the arrangement is simple and convenient to install and simple in structure, the LVDT can be always kept perpendicular to the surface of the displacement variable block 201, and the measurement precision is ensured.

The multidimensional expansion monitoring device provided by the embodiment is simple and convenient to install, can be used for simply and conveniently debugging signals, realizes diversity of signal transmission, and is convenient for integration of monitoring signals of a large number of expansion measuring points; in addition, the in-situ multidimensional expansion monitoring instrument and the field bus technology are utilized, the number of cables is greatly reduced, and meanwhile, the construction cost is reduced, so that the construction cost of the boiler expansion monitoring system is greatly reduced, and conditions are created for the practical application of the technology.

In addition to above-mentioned inflation monitoring devices, the utility model also provides an inflation monitoring system including above-mentioned inflation monitoring devices.

Further, this inflation monitoring system still includes the inflation monitoring instrument that is used for transmitting and showing the inflation data, and the inflation data is the inflation data that displacement sensor 300 detected, and inflation monitoring instrument can supply power to displacement sensor 300 to when displacement sensor 300 broke down, send alarm signal, be convenient for in time maintain and change displacement sensor 300, improve detection accuracy.

Further, the expansion monitoring system further comprises a server 400 and a controller 500, the expansion monitoring instrument is connected with the expansion monitoring device, the server 400 and the controller 500, the server 400 is used for converting the displacement amount into the expansion amount of the detected object, and the controller 500 is used for acquiring and storing temperature and pressure information of each monitoring point in the detected object and storing the displacement amount.

Specifically, the expansion monitoring instrument is used as a displacement acquisition, display and communication instrument, and can provide power for three displacement sensors 300 corresponding to expansion monitoring points, and acquire displacement vector signals measured by each displacement sensor 300 into the expansion monitoring instrument. The expansion monitoring instrument can realize the following functions:

1. and the digital display function of each path of displacement vector signals. The display can be carried out simultaneously or circularly;

2. integrating the displacement vector signals of all paths into a total displacement signal, and displaying;

3. the function of respectively outputting each path of displacement vector signals as 4-20mA current signals;

4. the functions of communication with a computer, a DCS control system, a PLC control system and the like are realized by a plurality of field bus protocols, such as foundation field bus protocol FF, HART protocol and the like.

5. The device has a sensor fault alarm function. And performing sensor fault alarm at a specific position of the instrument, and sending an alarm signal to a detection system through a communication network.

The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.

It is right above that the utility model provides an inflation monitoring devices introduces in detail. The principles and embodiments of the present invention have been explained herein using specific examples, and the above descriptions of the embodiments are only used to help understand the method and its core ideas of the present invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, the present invention can be further modified and modified, and such modifications and modifications also fall within the protection scope of the appended claims.

Claims

1. An expansion monitoring device is characterized by comprising a detection component (100) and a plurality of variation components (200) arranged on an object to be detected, wherein the detection component (100) can acquire the displacement of the variation components (200); the detection assembly (100) comprises a main body frame (101), a probe bracket (102) installed on the main body frame (101), and a displacement sensor (300) installed on the probe bracket (102); the number of the displacement sensors (300) is at least three, and the displacement of the variation assembly (200) in the X, Y, Z direction is respectively obtained; the main body frame (101) at least comprises three plate bodies which are perpendicular to each other, each plate body is at least provided with one probe support (102), one end of each probe support (102) is arranged on the corresponding plate body in an adjustable mode, and the displacement sensor (300) is arranged at the other end of each probe support (102).

2. The swelling monitoring device according to claim 1, wherein the plate body is provided with an arc-shaped groove, the probe bracket (102) is provided with a strip-shaped groove, and the length of the strip-shaped groove is greater than the radius of the arc-shaped groove; the probe support (102) can swing along the arc-shaped groove, and the intersection of the arc-shaped groove and the strip-shaped groove can move along the extending direction of the strip-shaped groove.

3. The swelling monitoring device according to claim 2, wherein a central hole is arranged on the plate body at the center of the arc-shaped groove, and the central hole is rotatably connected with the intersection of the strip-shaped groove of the probe bracket (102).

4. The swelling monitoring device according to claim 3, wherein said strip-shaped groove is connected to said central hole by a first connecting member (104), and wherein the intersection of said strip-shaped groove and said arc-shaped groove is connected by a second connecting member (105).

5. The expansion monitoring device according to claim 1, wherein the plate bodies are right-angled triangular plate bodies, and the right-angled sides of each right-angled triangular plate body are connected in sequence; a frame fixing rod (103) is connected to the main body frame; a triangular plane is arranged at the intersection of the plate bodies of the main body frame (101), and the frame fixing rod (103) is installed on the triangular plane; or the frame fixing rod (103) is arranged at the joint of the two right-angled triangular plate bodies, and the extending direction of the frame fixing rod (103) is parallel to the connecting side.

6. The distension monitoring device according to any one of claims 1 to 5, wherein the shifting assembly (200) comprises a displacement shifting block (201) and a shifting block fixing rod (202), and the shifting block fixing rod (202) is mounted on the object to be detected; the displacement variable block (201) is in a cuboid shape or is formed by vertically welding three rectangular plates in pairs, the detection assembly (100) is positioned at the corner of the displacement variable block (201), and three surfaces at the corner of the displacement variable block (201) correspond to at least one displacement sensor (300).

7. The inflation monitoring device according to any one of claims 1 to 5, wherein the displacement sensor (300) is a laser displacement sensor or an ultrasonic displacement sensor;

or the displacement sensor (300) is a rebound linear displacement sensor, a ball is arranged at the end part of the rebound linear displacement sensor, and the ball abuts against the variable assembly (200).

8. An inflation monitoring system comprising an inflation monitoring device, wherein the inflation monitoring device is as claimed in any one of claims 1 to 7.

9. The inflation monitoring system of claim 8, further comprising an inflation monitoring instrument for transmitting and displaying inflation data, the inflation monitoring instrument being operable to provide power to the displacement sensor (300) and to provide an alarm signal in the event of a failure of the displacement sensor (300).

10. The expansion monitoring system according to claim 9, further comprising a server (400) and a controller (500), wherein the expansion monitoring instrument is connected with the expansion monitoring device, the server (400) and the controller (500), the server (400) is used for converting a displacement amount into an expansion amount of the detected object, and the controller (500) is used for acquiring and storing temperature and pressure information of each monitoring point in the detected object and storing the displacement amount.