阅读说明：本技术 一种通风系统机械振动测试装置 (Ventilation system mechanical vibration testing arrangement ) 是由 郝宇 于 2021-11-11 设计创作，主要内容包括：本发明涉及振动检测技术领域,具体涉及一种通风系统机械振动测试装置,包括固定外壳,固定外壳内部为空腔结构,并在其上部设置有负压缸,负压缸远离固定外壳的一侧设置有多个吸盘,固定外壳还通过一号气缸连接微动板,微动板与通风管道连接,以检测其机械振动；补压组件设置在负压缸内,补压组件用于使负压缸内产生负压；测压组件设置在固定外壳内且通过导管与负压缸连接并导通,用于在补压组件将固定外壳吸附在墙壁上时,实时检测负压缸内的压强,并在负压缸内的压强过低时,控制补压组件动作；振动检测机构设置在微动板内,振动检测机构与通风管道抵接用于检测并实时记录通风管道的机械振动,以检测通风系统的机械振动。(The invention relates to the technical field of vibration detection, in particular to a ventilation system mechanical vibration testing device which comprises a fixed shell, wherein the inside of the fixed shell is of a cavity structure, a negative pressure cylinder is arranged at the upper part of the fixed shell, one side of the negative pressure cylinder, which is far away from the fixed shell, is provided with a plurality of suckers, the fixed shell is also connected with a micro movable plate through a first air cylinder, and the micro movable plate is connected with a ventilation pipeline so as to detect the mechanical vibration of the ventilation pipeline; the pressure compensating assembly is arranged in the negative pressure cylinder and is used for generating negative pressure in the negative pressure cylinder; the pressure measuring assembly is arranged in the fixed shell, is connected and communicated with the negative pressure cylinder through a guide pipe, is used for detecting the pressure in the negative pressure cylinder in real time when the pressure supplementing assembly adsorbs the fixed shell on the wall, and controls the action of the pressure supplementing assembly when the pressure in the negative pressure cylinder is too low; the vibration detection mechanism is arranged in the micro-moving plate and is abutted against the ventilation pipeline to detect and record mechanical vibration of the ventilation pipeline in real time so as to detect mechanical vibration of the ventilation system.)

1. A mechanical vibration testing device of a ventilation system is characterized by comprising: the air conditioner comprises a fixed shell (1), wherein the inside of the fixed shell (1) is of a cavity structure, a negative pressure cylinder (2) is arranged at the upper part of the fixed shell, one side, away from the fixed shell (1), of the negative pressure cylinder (2) is provided with a plurality of suckers (3) which are communicated with the negative pressure cylinder and can be detached, the fixed shell (1) is further connected with a micro movable plate (14) through a first air cylinder (13), and the micro movable plate (14) is connected with a ventilation pipeline so as to detect mechanical vibration of the ventilation pipeline; the pressure supplementing assembly is arranged in the negative pressure cylinder (2) and is used for generating negative pressure in the negative pressure cylinder (2) so that the fixed shell (1) can be adsorbed on a wall; the pressure measuring assembly is arranged in the fixed shell (1), is connected with the negative pressure cylinder (2) through a guide pipe and is communicated, and is used for detecting the pressure in the negative pressure cylinder (2) in real time when the pressure supplementing assembly adsorbs the fixed shell (1) on the wall and controlling the action of the pressure supplementing assembly when the pressure in the negative pressure cylinder (2) is too low; the vibration detection mechanism is arranged in the micro-moving plate (14), and the vibration detection mechanism is abutted against the ventilation pipeline and is used for detecting and recording the mechanical vibration of the ventilation pipeline in real time.

2. The mechanical vibration testing device of the ventilation system as claimed in claim 1, wherein the pressure compensating assembly comprises a first piston (4) tightly attached to the inner wall of the negative pressure cylinder (2), and a meshing structure connected with the first piston (4) and arranged in the fixed housing (1); the ratcheting structure is in communication with the load cell assembly.

3. The mechanical vibration testing device of the ventilation system as claimed in claim 2, wherein the meshing structure comprises a driving device (7) arranged at one end of the negative pressure cylinder (2) far away from the sucker (3), a gear (6) connected with an output shaft of the driving device (7) and arranged on the negative pressure cylinder (2), and a rack plate (5) engaged with the gear (6) and connected with the first piston (4).

4. The mechanical vibration testing device of the ventilation system as claimed in claim 1, wherein the pressure measuring assembly comprises a detection cylinder (9) mounted on the fixed housing (1), a second piston (10) movably arranged in the detection cylinder (9) and closely attached to the inner wall of the detection cylinder, a connecting rod (12) connected with the second piston (10) and extending to the outside of the detection cylinder (9) through the detection cylinder (9), and a first spring (11) sleeved on the connecting rod (12); the one end of a spring (11) with detect jar (9) inner wall connection, the other end with No. two pistons (10) are connected, just connecting rod (12) are kept away from the contact is installed to the one end of No. two pistons (10), the contact with set up contact switch (8) adaptation on fixed shell (1) inner wall.

5. The mechanical vibration testing device of a ventilating system according to claim 1, wherein said vibration detecting means comprises a horizontal detecting member elastically coupled to said micro movable plate (14), a vertical detecting member disposed in said micro movable plate (14), and a stepping member engaged with said horizontal detecting member and said vertical detecting member; the horizontal detection assembly is used for detecting horizontal vibration of the ventilation pipeline, and the vertical detection assembly is used for detecting vertical vibration of the ventilation pipeline.

6. The mechanical vibration testing device of the ventilation system as claimed in claim 5, wherein the level detection assembly comprises two expansion plates (15) symmetrically and movably arranged on the micro movable plate (14), a baffle plate connecting the two expansion plates (15), a vertical rod (23) arranged on the micro movable plate (14) and penetrating through the baffle plate, and a second spring (24) sleeved on the vertical rod (23); one end of the second spring (24) is abutted against the inner wall of the micro movable plate (14), the other end of the second spring is abutted against the baffle plate, and a limiting block is arranged at one end, far away from the micro movable plate (14), of the baffle plate.

7. The mechanical vibration testing device of a ventilation system as claimed in claim 6, wherein said vertical detecting assembly comprises a pulley (16) installed at one end of two said telescopic plates (15) far from said baffle, a belt (17) connected with the pulley (16) and disposed on one of said telescopic plates (15), a moving plate (18) connected with said belt (17); the belt (17) is divided into an upper layer and a lower layer, the movable plate (18) is fixedly connected with the lower layer of the belt (17), and one end, far away from the belt (17), of the movable plate (18) is movably arranged on a guide rod (19) fixed with the baffle.

8. The mechanical vibration testing device of the ventilation system as claimed in claim 7, wherein the stepping assembly comprises a second cylinder (21) mounted on one of the telescopic plates (15), two second guide rods (22) symmetrically mounted on the telescopic plate (15), and an engagement plate (25) arranged on the second guide rods (22); a drawing board can be inserted into the embedded plate (25), the drawing board is matched with two marking pens (20) arranged on the fixed shell (1) and the movable plate (18), and the telescopic end of the second cylinder (21) is fixedly connected with the embedded plate (25).

Technical Field

The invention relates to a vibration detection device, in particular to a mechanical vibration testing device of a ventilation system.

Background

All mechanical problems and electrical problems of various equipment can generate vibration signals, except for machines which work by using a vibration principle, the vibration is harmful, the vibration can destroy the normal work of the machines, accelerate the failure of the machines and shorten the service life, and if the size and the source of the vibration can be mastered, the maintenance work can be completed in advance before the equipment is not seriously deteriorated, so that the equipment is prevented from being damaged more, and the production is prevented from being influenced or the maintenance cost is increased; the magnitude of the vibration is closely related to the severity of the equipment problem.

In ventilation system's use, if it produces unusual vibration, probably lead to the fact the destruction to ventilation pipe's structure, traditional ventilation system vibration detection device is handheld mostly, and the detection of vibration needs certain time, and this just needs the testing personnel to aim at ventilation pipe with the detector for a long time, and ventilation pipe height is higher, and long-time test can bring certain risk, for this reason we propose a ventilation system mechanical vibration testing arrangement.

Disclosure of Invention

The invention aims to provide a mechanical vibration testing device of a ventilation system, which aims to solve the problems in the prior art.

In order to achieve the purpose, the invention provides the following technical scheme:

a mechanical vibration testing apparatus of a ventilating system, comprising:

the fixing shell is internally of a cavity structure, a negative pressure cylinder is arranged at the upper part of the fixing shell, one side of the negative pressure cylinder, which is far away from the fixing shell, is provided with a plurality of suckers which are communicated with the negative pressure cylinder and can be detached, the fixing shell is also connected with a micro movable plate through a first air cylinder, and the micro movable plate is connected with a ventilating duct so as to detect the mechanical vibration of the ventilating duct;

the pressure supplementing assembly is arranged in the negative pressure cylinder and used for generating negative pressure in the negative pressure cylinder so that the fixed shell can be adsorbed on a wall;

the pressure measuring assembly is arranged in the fixed shell, is connected and communicated with the negative pressure cylinder through a guide pipe, is used for detecting the pressure in the negative pressure cylinder in real time when the fixed shell is adsorbed on the wall by the pressure supplementing assembly, and controls the action of the pressure supplementing assembly when the pressure in the negative pressure cylinder is too low;

the vibration detection mechanism is arranged in the micro-moving plate and is abutted against the ventilation pipeline to detect and record mechanical vibration of the ventilation pipeline in real time.

As a further scheme of the invention: the pressure compensating assembly comprises a first piston tightly attached to the inner wall of the negative pressure cylinder and a meshing structure connected with the first piston and arranged in the fixed shell;

the ratcheting structure is in communication with the load cell assembly.

As a still further scheme of the invention: the meshing structure comprises a driving device arranged at one end, far away from the sucker, of the negative pressure cylinder, a gear connected with an output shaft of the driving device and arranged on the negative pressure cylinder, and a rack plate meshed with the gear and fixedly connected with the first piston.

As a still further scheme of the invention: the pressure measuring assembly comprises a detection cylinder fixedly arranged on the fixed shell, a second piston movably arranged in the detection cylinder and tightly attached to the inner wall of the detection cylinder, a connecting rod connected with the second piston and penetrating through the detection cylinder to extend to the outside of the detection cylinder, and a first spring sleeved on the connecting rod;

the one end of a spring with detect jar inner wall connection, the other end with No. two piston connections, just the connecting rod is kept away from the contact is installed to the one end of No. two pistons, the contact with set up contact switch adaptation on the fixed shell inner wall.

As a still further scheme of the invention: the vibration detection mechanism comprises a horizontal detection assembly elastically connected with the micro-motion plate, a vertical detection assembly arranged in the micro-motion plate, and a stepping assembly matched with the horizontal detection assembly and the vertical detection assembly;

the horizontal detection assembly is used for detecting horizontal vibration of the ventilation pipeline, and the vertical detection assembly is used for detecting vertical vibration of the ventilation pipeline.

As a still further scheme of the invention: the horizontal detection assembly comprises two expansion plates symmetrically and movably arranged on the micro-motion plate, a baffle plate connected with the two expansion plates, a vertical rod fixedly arranged on the micro-motion plate and penetrating through the baffle plate, and a second spring sleeved on the vertical rod;

one end of the second spring is abutted against the inner wall of the micro movable plate, the other end of the second spring is abutted against the baffle plate, and a limiting block is arranged at one end, far away from the micro movable plate, of the baffle plate.

As a still further scheme of the invention: the vertical detection assembly comprises a pulley rotatably mounted at one end of each of the two telescopic plates far away from the baffle, a belt connected with the pulley and arranged on one of the telescopic plates, and a moving plate connected with the belt;

the belt is divided into an upper layer and a lower layer, the movable plate is fixedly connected with the lower layer of the belt, and one end, far away from the belt, of the movable plate is movably arranged on a guide rod fixed with the baffle.

As a still further scheme of the invention: the stepping assembly comprises a second cylinder fixedly arranged on one of the telescopic plates, two second guide rods symmetrically arranged on the telescopic plates, and an embedded plate arranged on the second guide rods in a sliding manner;

the embedded plate is provided with a drawing board in an inserting mode, the drawing board is matched with two marking pens fixedly installed on the fixed shell and the movable plate, and the telescopic end of the second cylinder is fixedly connected with the embedded plate.

Compared with the prior art, the invention has the beneficial effects that:

the invention has novel design, when in use, the negative pressure is generated in the negative pressure cylinder through the pressure supplementing assembly, and the device is fixed on the wall through the sucker, meanwhile, the vibration detection mechanism is abutted against the pipe wall of the ventilation pipeline, the vibration detection mechanism can detect the horizontal vibration of the ventilation pipeline on one hand and can detect the vertical vibration of the ventilation pipeline on the other hand, so that multi-angle and all-directional detection is realized, considering that the sucker is contacted with the wall for a long time and bears certain weight, a gap is possibly generated between the sucker and the wall, so that the outside air enters the negative pressure cylinder to cause the separation between the sucker and the wall, therefore, the pressure measuring component is arranged and communicated with the pressure supplementing component, when the negative pressure in the negative pressure cylinder is reduced, the pressure measuring assembly controls the pressure supplementing assembly to act, the negative pressure value in the negative pressure cylinder is increased, and the sucking disc is stably connected with the wall during detection.

Drawings

FIG. 1 is a schematic structural view of an embodiment of a mechanical vibration testing apparatus for a ventilating system;

FIG. 2 is a schematic view of another embodiment of a mechanical vibration testing apparatus for a ventilating system;

FIG. 3 is a schematic structural diagram of a pressure compensating assembly and a pressure measuring assembly in an embodiment of a mechanical vibration testing apparatus for a ventilation system;

FIG. 4 is a schematic cross-sectional view of a pressure compensating assembly and a pressure measuring assembly in an embodiment of a mechanical vibration testing apparatus for a ventilation system;

fig. 5 is an exploded view of a vibration detecting mechanism in an embodiment of the mechanical vibration testing apparatus for a ventilating system.

In the figure: 1-fixed shell, 2-negative pressure cylinder, 3-sucker, 4-first piston, 5-rack plate, 6-gear, 7-driving device, 8-contact switch, 9-detection cylinder, 10-second piston, 11-first spring, 12-connecting rod, 13-first cylinder, 14-micro movable plate, 15-expansion plate, 16-pulley, 17-belt, 18-movable plate, 19-first guide rod, 20-marking pen, 21-second cylinder, 22-second guide rod, 23-vertical rod, 24-second spring and 25-embedded plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

In addition, an element of the present invention may be said to be "fixed" or "disposed" to another element, either directly on the other element or with intervening elements present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.

Referring to fig. 1 to 5, in an embodiment of the present invention, a mechanical vibration testing apparatus for a ventilation system includes: the device comprises a fixed shell 1, a pressure supplementing assembly, a pressure measuring assembly and a vibration detection mechanism;

the device comprises a fixed shell 1, wherein the inside of the fixed shell 1 is of a cavity structure, a negative pressure cylinder 2 is arranged at the upper part of the fixed shell, a plurality of suckers 3 which are communicated with and detachable from the negative pressure cylinder 2 are arranged on one side of the negative pressure cylinder 2, which is far away from the fixed shell 1, the fixed shell 1 is also connected with a micro movable plate 14 through a first air cylinder 13, and the micro movable plate 14 is connected with a ventilation pipeline so as to detect the mechanical vibration of the ventilation pipeline;

wherein, foretell sucking disc 3 is made by soft rubber, when using, it can and the wall between closely laminate, and behind the negative pressure jar 2 interior production negative pressure, with adsorb each other between the wall, and fix fixed shell 1 on the wall, make whole device adsorbable on the wall, compare in traditional hand-held type detection device, from the aspect of using manpower sparingly, this device does not need the measurement personnel to paste vibration detection device on air pipe's pipe wall through the people hand for a long time, from the aspect of the installation, this device is at the during operation, absorption that can stabilize is on the wall, and do not need the measurement personnel to ascend a height and detect, avoided measurement personnel to take place the risk of falling at long-time high altitude construction in-process, therefore, the clothes hanger is strong in practicability, and is suitable for wide popularization and use.

The pressure supplementing assembly is arranged in the negative pressure cylinder 2 and is used for generating negative pressure in the negative pressure cylinder 2 so that the fixed shell 1 can be adsorbed on the wall;

the pressure supplementing assembly comprises a first piston 4 tightly attached to the inner wall of the negative pressure cylinder 2 and a meshing structure which is connected with the first piston 4 and arranged in the fixed shell 1;

the meshing structure and the pressure measuring assembly;

the meshing structure comprises a driving device 7 arranged at one end of the negative pressure cylinder 2 far away from the sucker 3, a gear 6 connected with an output shaft of the driving device 7 and arranged on the negative pressure cylinder 2, and a rack plate 5 meshed with the gear 6 and fixedly connected with the first piston 4.

The one end that sucking disc 3 was kept away from to above-mentioned negative pressure cylinder 2 sets up for the opening, and be provided with the mounting panel on open position, 7 fixed mounting of drive arrangement are on the mounting panel, 6 rotations of gear are installed on the mounting panel, and be provided with the through-hole at the middle part of mounting panel, 5 slip settings of rack are in the through-hole, simultaneously under the effect of through-hole, guaranteed rack 5 at the meshing in-process with gear 6, it can not take place to let the position, make at the rotation in-process of gear 6, rack 5 can normal removal.

In the use process, the driving device 7 rotates, the gear 6 is driven to rotate through the rotating shaft, the gear 6 is meshed with the rack plate 5 to drive the rack plate 5 to move, so that the first piston 4 generates displacement in the negative pressure cylinder 2, negative pressure is generated in the negative pressure cylinder 2, and the fixed shell 1 is fixed on a wall through the sucker 3.

Wherein, a piston 4 is provided with a plurality of sealing washers along its circumferential surface who is connected with negative pressure jar 2 to guarantee in the use, the inseparable laminating nature of a piston 4 and 2 inner walls of negative pressure jar, and because the setting of sealing washer, after repetitious usage, need change the sealing washer, the change opportunity of sealing washer is decided according to specific in service behavior, does not specifically prescribe a limit to this application.

It should be noted that the driving device 7 is a forward and reverse rotation motor, and a 4IK/80 yyyjt motor is adopted, which has stable performance and strong output torque, and other types of motors can be adopted as long as the driving requirements are met, which is not specifically limited in this application.

The pressure measuring assembly is arranged in the fixed shell 1, is connected with the negative pressure cylinder 2 through a guide pipe and is communicated with the negative pressure cylinder 2, and is used for detecting the pressure in the negative pressure cylinder 2 in real time when the pressure compensating assembly adsorbs the fixed shell 1 to the wall and controlling the action of the pressure compensating assembly when the pressure in the negative pressure cylinder 2 is too low;

the pressure measuring assembly comprises a detection cylinder 9 fixedly arranged on the fixed shell 1, a second piston 10 movably arranged in the detection cylinder 9 and tightly attached to the inner wall of the detection cylinder, a connecting rod 12 connected with the second piston 10 and penetrating through the detection cylinder 9 to extend to the outside of the detection cylinder, and a first spring 11 sleeved on the connecting rod 12;

one end of a first spring 11 is connected with the inner wall of the detection cylinder 9, the other end of the first spring is connected with a second piston 10, a contact is installed at one end, far away from the second piston 10, of a connecting rod 12, and the contact is matched with a contact switch 8 arranged on the inner wall of the fixed shell 1.

When the device is used, the first piston 4, the negative pressure cylinder 2, the sucker 3 and the wall form a closed space with the pressure measuring cylinder 9 and the second piston 10 through the guide pipe, so that when the first piston 4 moves away from the sucker 3 in the negative pressure cylinder 2 to generate negative pressure in the negative pressure cylinder 2, the second piston 10 moves towards one end of the guide pipe connected with the pressure measuring cylinder 9 under the action of the negative pressure and compresses the first spring 11, the contact installed on the connecting rod 12 keeps a joint state with the contact switch 8 at the moment, the elastic potential energy generated by the first spring 11 is exactly balanced with the pressure generated in the closed chamber, the driving device 7 stops rotating to keep the pressure in the closed chamber constant, when an air leakage phenomenon exists between the sucker 3 and the wall, the negative pressure in the closed space is reduced, the elastic potential energy of the first spring 11 is larger than the pressure generated by the negative pressure, and the first spring 11 releases the elastic potential energy, and the contact is disconnected with the contact switch 8 through the connecting rod 12, and the driving device 7 immediately starts working at the moment after disconnection so as to supplement the negative pressure in the closed cavity and ensure the stable connection between the sucker 3 and the wall.

The vibration detection mechanism is arranged in the micro-moving plate 14 and is abutted against the ventilation pipeline for detecting and recording the mechanical vibration of the ventilation pipeline in real time;

the vibration detection mechanism comprises a horizontal detection component elastically connected with the micro-moving plate 14, a vertical detection component arranged in the micro-moving plate 14, and a stepping component matched with the horizontal detection component and the vertical detection component;

the horizontal detection assembly is used for detecting horizontal vibration of the ventilation pipeline, and the vertical detection assembly is used for detecting vertical vibration of the ventilation pipeline;

the horizontal detection assembly comprises two expansion plates 15 symmetrically and movably arranged on the micro movable plate 14, a baffle plate for connecting the two expansion plates 15, a vertical rod 23 fixedly arranged on the micro movable plate 14 and arranged by penetrating through the baffle plate, and a second spring 24 sleeved on the vertical rod 23;

one end of the second spring 24 abuts against the inner wall of the micro-moving plate 14, the other end of the second spring abuts against the baffle, and a limiting block is arranged at one end, far away from the micro-moving plate 14, of the baffle.

In the use, adsorb together between sucking disc 3 and the wall, perpendicular detection subassembly and air pipe's pipe wall butt this moment, when air pipe produced horizontal vibration, transmit vibratory force to step by step subassembly through expansion plate 15 to by step subassembly record level pivoted frequency and amplitude, realize the horizontal vibration detection to air pipe.

It is worth noting that the suction cup 3 is connected with the wall, and when the vertical detection assembly is abutted against the pipe wall of the ventilation pipeline, the second spring 24 needs to be compressed by a certain amount, the above method mainly considers that the ventilation pipeline has a trend towards the expansion plate 15 or away from the expansion plate 15 in the detection process of horizontal vibration, if the suction cup 3 is connected with the wall, only the vertical detection assembly is attached to the pipe wall of the ventilation pipeline, vibration may exist when the ventilation pipeline moves away from the expansion plate 15, and the vibration cannot be detected.

The vertical detection assembly comprises a pulley 16 rotatably mounted at one end of each of the two telescopic plates 15 far away from the baffle, a belt 17 connected with the pulley 16 and arranged on one telescopic plate 15, and a moving plate 18 connected with the belt 17;

the belt 17 is divided into an upper layer and a lower layer, the moving plate 18 is fixedly connected with the lower layer of the belt 17, and one end, far away from the belt 17, of the moving plate 18 is movably arranged on a first guide rod 19 fixed with the baffle.

When the sucker 3 is fixed between a wall and a sucker, the pulley 16 is in rolling connection with the ventilating duct, when the ventilating duct vibrates in the vertical direction, the pulley 16 rotates relatively, the moving plate 18 is driven by the belt 17 to move in the length direction of the first guide rod 19, and the amplitude and the frequency of the vertical vibration of the moving plate 18 are recorded by the stepping assembly.

The stepping assembly comprises a second cylinder 21 fixedly arranged on one telescopic plate 15, two second guide rods 22 symmetrically arranged on the telescopic plate 15 and a tabling plate 25 arranged on the second guide rods 22 in a sliding manner;

a drawing board can be inserted on the embedded plate 25, the drawing board is matched with two marking pens 20 fixedly arranged on the fixed shell 1 and the movable plate 18, and the telescopic end of the second cylinder 21 is fixedly connected with the embedded plate 25.

When the ventilation duct vibrates horizontally, the retractable plate 15 drives the embedded plate 25 to displace slightly on the horizontal plane, and the marking pen 20 on the embedded plate 25 is fixedly connected with the fixed shell 1, so that the marking pen 20 leaves the horizontal vibration amplitude and frequency of the ventilation duct on the upper surface of the drawing board inserted on the embedded plate 25.

Similarly, the embedded plate 25 is disposed between the telescopic plates 15, when the ventilation duct vibrates vertically, the pulley 16 rotates, the belt 17 drives the moving plate 18 to move, and the marking pen 20 disposed on the moving plate 18 leaves the vertical vibration amplitude and frequency of the ventilation duct on the lower surface of the drawing board inserted on the embedded plate 25.

Under the action of the second cylinder 21, the embedded plate 25 moves slowly, so that the horizontal vibration and the vertical vibration recorded on the upper surface and the lower surface of the embedded plate cannot interfere with each other, and the detection personnel can judge the embedded plate conveniently.

It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.