CN212111303U - Inflammable volatile substance detector - Google Patents

Abstract

The utility model discloses a easily fire volatile substance detector, include: the shell is internally provided with an accommodating cavity, a cover opening communicated with the accommodating cavity is formed below the shell, and the shell is also provided with a clamping opening communicated with the inner wall surface and the outer wall surface of the side wall of the shell; the detection circuit board is arranged in the accommodating cavity and is provided with a detection probe; the bottom cover is covered on the cover opening and provided with a clamping structure, and at least part of the clamping structure is clamped on the clamping opening; the clamping structure is pushed by the clamping opening to clamp the part of the clamping opening, so that the clamping state of the clamping structure and the clamping opening is relieved. The utility model discloses aim at having solved: the shell structure of the existing inflammable volatile detector is difficult to clean the inner surface of the shell regularly.

Description

Inflammable volatile substance detector

Technical Field

The utility model relates to an automobile inspection equipment technical field especially relates to a easily fire volatile substance detector.

Background

The flammable volatile substance detector is generally installed on public traffic vehicles such as buses, trains, taxis and the like, is a device for quickly detecting the concentration of flammable liquid volatile substances in the vehicles, and has the function of early warning in time so as to prevent sudden explosion accidents in the vehicles. Present easily fire volatile substance detector, including the casing with install the detection circuit board (or the test probe) in the casing, set up the opening with external intercommunication on the casing to the outside air passes through the opening gets into in the casing, so that the detection circuit board can contact with the outside air to detect the flammable liquid volatile substance concentration in the air, in the use, easy deposit has the dust on the internal face of detection circuit board or casing, has blockked detection circuit board and air contact, thereby has influenced the accuracy nature that detects, consequently needs regularly to clear up the internal surface of casing.

At present, a shell has two structures, wherein one structure is that the shell is integrally formed, a detection circuit board is packaged in the shell in the manufacturing process, and the shell cannot be detached, so that the inner surface of the shell is difficult to clean; the other type is that an opening is formed in one side face of the shell, a bottom cover is arranged on the opening, the bottom cover and the shell are fixed into a whole in a screw or screw mode, the shell and the bottom cover are relatively complicated to disassemble, and the screw or the screw is inconvenient to handle when rusted, so that the shell and the bottom cover are difficult to disassemble to clean the inner surface of the shell.

Obviously, the shell structure of the current flammable volatile detector exists: the inner surface of the shell is difficult to clean regularly.

SUMMERY OF THE UTILITY MODEL

The embodiment of the utility model provides an aim at: which can solve the above-mentioned problems existing in the prior art.

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

a combustible volatile detector comprising:

the shell is internally provided with an accommodating cavity, a cover opening communicated with the accommodating cavity is formed below the shell, and the shell is also provided with a clamping opening communicated with the inner wall surface and the outer wall surface of the side wall of the shell;

the detection circuit board is arranged in the accommodating cavity and is provided with a detection probe;

the bottom cover is covered on the cover opening and provided with a clamping structure, and at least part of the clamping structure is clamped on the clamping opening;

the clamping structure is pushed by the clamping opening to clamp the part of the clamping opening, so that the clamping state of the clamping structure and the clamping opening is relieved.

Optionally, the clamping structure is a clamping hook, the clamping hook comprises an elastic connecting portion and a hooking portion, the elastic connecting portion and the hooking portion are connected, the elastic connecting portion is convexly arranged on the upper surface of the bottom cover, the hooking portion is connected to one side, away from the bottom cover, of the elastic connecting portion, the hooking portion extends towards the clamping opening and is clamped on the inner wall surface of the clamping opening.

Optionally, the upper surface of the hooking part is arranged obliquely upward from the outside to the inside of the shell.

Optionally, the upper surface of the hooking portion is in an arc shape recessed towards the accommodating cavity.

Optionally, the fastening structure is an elastic arm, at least a portion of the elastic arm is fastened to the fastening opening, a portion of the elastic arm fastened to the fastening opening is provided with an elastic protrusion in a protruding manner, a fastening groove is formed in a peripheral wall of the fastening opening, and the elastic protrusion is fastened to the fastening groove.

Optionally, the clamping opening and the clamping structure are provided with a plurality of clamping openings, at least part of each clamping structure is clamped in each clamping opening, and the plurality of clamping structures are arranged at equal intervals along the periphery of the bottom cover.

Optionally, easily fire volatile substance detector still includes induced draft fan, induced draft fan locates in the casing, induced draft fan with the side of detection circuit board sets up relatively, the intercommunication is still seted up to the casing the vent of inside and outside wall surface of casing.

Optionally, the casing is further provided with a threading hole communicated with the inner wall surface and the outer wall surface of the casing, the flat cable is threaded through the threading hole, and a thread buckle is clamped on the inner wall surface of the threading hole.

Optionally, the detection circuit board is electrically connected with a communication indicator lamp, a fault indicator lamp, an alarm indicator lamp and a power indicator lamp, the housing is further provided with four lamp holes, and the four lamp holes are respectively opposite to the communication indicator lamp, the fault indicator lamp, the alarm indicator lamp and the power indicator lamp.

Optionally, the outer surface of the housing is provided with two protruding fixing plates, the two fixing plates are respectively protruding on two opposite wall surfaces of the housing, the fixing plate is provided with a first mounting hole, and the first mounting hole is provided for the connecting piece to penetrate through.

The utility model provides a easily fire volatile substance detector, its casing and bottom pass through detachably joint mode and connect, the beneficial effects of the utility model are that: the bottom cover is convenient to disassemble and easy to operate, the bottom cover is disassembled to expose the cover opening, and the inner surface of the shell is convenient to clean through the cover opening. Specifically, the shell is provided with a clamping opening communicated with the inside and the outside of the shell, the bottom cover is provided with a clamping structure, and the clamping structure is partially clamped in the clamping opening. The clamping structure is pushed through the clamping opening, and the clamping structure is separated from the clamping opening so as to relieve the clamping state of the clamping structure and the clamping opening. In the conventional inflammable volatile substance detector, the shell and the bottom cover are assembled in a manner of being screwed by screws or screws. In the disassembling process, not only is the operation troublesome, but also when the screw or the bolt rusts, the screw or the bolt is difficult to take out, and unnecessary trouble is brought. In the scheme, the problems can be solved better.

Drawings

The present invention will be described in further detail with reference to the accompanying drawings and examples.

FIG. 1 is a schematic perspective view of a flammable volatile detector according to an embodiment of the present invention;

FIG. 2 is a schematic view of a three-dimensional structure of a flammable volatile substance detector according to an embodiment of the present invention;

FIG. 3 is an illustration of an internal configuration of a flammable volatile detector housing according to an embodiment of the present invention;

fig. 4 is a diagram showing the structure on the right side of the flammable volatile detector according to the embodiment of the present invention.

In the figure:

100. a flammable volatile detector; 10. a housing; 11. covering the opening; 12. clamping a port; 13. a vent; 14. a lamp hole; 15. a vent; 20. detecting the circuit board; 21. detecting a probe; 30. a bottom cover; 31. a clamping structure; 311. an elastic connection portion; 312. a hooking part; 40. an air draft fan; 50. wire buckling; 60. a fixing plate; 61. a first mounting hole; 62. and a second mounting hole.

Detailed Description

In order to make the technical problems, technical solutions and technical effects achieved by the present invention more clear, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings, and obviously, the described embodiments are only some embodiments, not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "fixed" are to be understood broadly, e.g. as a fixed connection, a detachable connection or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1-4, in one embodiment of the present invention, a flammable volatile detector 100 is provided, comprising:

the shell 10 is provided with an accommodating cavity inside, a cover opening 11 communicated with the accommodating cavity is formed below the shell 10, and the shell 10 is further provided with a clamping opening 12 communicated with the inner wall surface and the outer wall surface of the side wall of the shell 10;

the detection circuit board 20 is arranged in the accommodating cavity, and is provided with a detection probe 21;

the bottom cover 30 is covered on the cover opening 11, the bottom cover 30 is provided with a clamping structure 31, and at least part of the clamping structure 31 is clamped on the clamping opening 12;

the part of the clamping structure 31 clamped on the clamping opening 12 is pushed by the clamping opening 12 so as to release the clamping state of the clamping structure 31 and the clamping opening 12.

In this embodiment, casing 10 is roughly the rectangle form, including the left side board, preceding curb plate, right side board, the posterior lateral plate that connect gradually, the left side board preceding curb plate the right side board and the posterior lateral plate encloses the cavity that closes formation rectangle form, and casing 10 is still including the roof, the roof is the rectangle form, its four sides respectively with the left side board preceding curb plate the right side board and the last side connection of posterior lateral plate, can understand, the left side board preceding curb plate the right side board, go up the curb plate and posterior lateral plate integrated into one piece connects to enclose and close the formation hold the chamber, in order to guarantee the stability of casing 10 structure. A plurality of air vents 15 are opened on the right side plate to allow external air to pass therethrough.

The detection circuit board 20 is mounted on the surface of the upper side plate, the detection circuit board 20 is electrically connected with the detection probe 21, and the detection probe 21 is convexly arranged on the lower surface of the detection circuit board 20 and is opposite to the air port.

The front side board with all seted up on the posterior lateral plate the mouth 12 is established to the card, the mouth 12 is established to the card specifically is the rectangle form, the mouth 12 is established to the card supplies to establish the structure 31 card in the card and establishes. The clamping structure 31 is convexly arranged on the upper surface of the bottom plate, and it can be understood that the clamping structure 31 can be integrally formed with the bottom plate or detachably connected with the bottom plate.

In this embodiment, the fastening structure 31 is integrally connected with the bottom plate, and a part of the fastening structure 31 is fastened in the fastening opening 12, and it should be noted that a part of the fastening structure 31 fastened in the fastening opening 12 can slide along an opening direction of the fastening opening 12. In a natural state, the clamping structure 31 is clamped with the clamping port 12; when the detection circuit board 20 needs to be detached for cleaning, a human hand or a pushing piece penetrates through the clamping opening 12, and the clamping structure 31 is pushed towards the inside of the shell 10, so that the clamping structure 31 is separated from the clamping opening 12, the clamping state of the clamping structure 31 and the clamping opening 12 is released, and the bottom cover 30 is detached to take out the detection circuit board 20.

The utility model provides a easily fire volatile substance detector 100, its casing 10 and bottom 30 are connected through detachably joint mode to it is comparatively convenient to make the dismantlement mode of bottom 30, easy operation, will bottom 30 dismantles the back, establishes mouthful 11 with revealing the lid, establishes mouthful 11 through the lid and is convenient for clear up casing 10's internal surface. Specifically, the housing 10 is provided with a clamping opening 12 communicating the inside and the outside of the housing 10, the bottom cover 30 is provided with a clamping structure 31, and a part of the clamping structure 31 is clamped in the clamping opening 12. The clamping structure 31 is pushed through the clamping opening 12, and the clamping structure 31 is separated from the clamping opening 12, so that the clamping state of the clamping structure 31 and the clamping opening 12 is released. In the conventional inflammable volatile substance detector 100, the housing 10 and the bottom cover 30 are assembled by screwing with screws or bolts. In the disassembling process, not only is the operation troublesome, but also when the screw or the bolt rusts, the screw or the bolt is difficult to take out, and unnecessary trouble is brought. In the scheme, the problems can be solved better.

As shown in fig. 1-4, in an embodiment of the present invention, the fastening structure 31 is a hook, the hook includes an elastic connection portion 311 and a hooking portion 312 connected to each other, the elastic connection portion 311 is protruded from the upper surface of the bottom cover 30, the hooking portion 312 is connected to one side of the bottom cover 30 away from the elastic connection portion 311, and the hooking portion 312 extends toward the fastening opening 12 and is fastened to the inner wall surface of the fastening opening 12.

In this embodiment, the elastic connection portion 311 is in a strip shape, one end of the elastic connection portion is connected to the bottom cover 30, the other end of the elastic connection portion is connected to the hooking portion 312, and the lower surface of the hooking portion 312 is abutted to the lower wall surface of the fastening opening 12.

It can be understood that, in a natural state, the elastic connection portion 311 drives the hooking portion 312 to hook in the fastening opening 12, when the hooking portion 312 is pushed, the elastic connection portion 311 is elastically deformed, and after pushing is finished, the elastic connection portion 311 returns to a natural state, that is, the hooking portion 312 stays at a position hooked in the fastening opening 12.

As shown in fig. 1-4, in an embodiment of the present invention, the upper surface of the hooking portion 312 is inclined upward from the outside of the housing 10 to the inside.

Thus, the upper surface of the hooking part 312 and the inner wall surface of the clamping opening 12 form a large operation space, so that the hand of a maintenance worker can pass through the operation space, the clamping structure 31 is pushed, and the operation is facilitated.

In an embodiment of the present invention, the upper surface of the hooking portion 312 faces the circular arc-shaped cavity.

So set up, the upper surface of colluding portion 312 can be with the better laminating of the finger of people's hand to be convenient for carry out the top to colluding portion 312.

In an embodiment of the present invention, the elastic arm is an elastic arm, at least a portion of the elastic arm is located in the card-setting opening, the elastic arm is located in the portion of the card-setting opening protruding with an elastic protrusion, the peripheral wall of the card-setting opening is provided with a card-setting groove, and the elastic protrusion is located in the card-setting groove.

In this embodiment, the elastic arm is substantially in the shape of a bar, and the elastic protrusion is disposed along the periphery of the elastic arm, it can be understood that the fastening groove is disposed along the periphery of the fastening opening, so that the elastic protrusion and the groove have a larger fastening area, and the stability of the fastening opening is improved when the elastic arm is fastened to the fastening opening.

It should be noted that, the elastic protrusion and the clamping groove are in interference fit.

As shown in fig. 1-4, in an embodiment of the present invention, the plurality of engaging openings 12 and the plurality of engaging structures 31 are provided, each engaging structure 31 is at least partially engaged in each engaging opening 12, and the plurality of engaging structures 31 are disposed at equal intervals along the circumference of the bottom cover 30.

In this embodiment, the number of the fastening structures 31 and the fastening openings 12 is four, specifically, two fastening openings 12 are disposed on the front side plate, two fastening openings 12 are disposed on the rear side plate, the bottom cover 30 is substantially rectangular, and the four fastening structures 31 are disposed at four corners of the bottom cover 30 respectively.

Through a plurality of the card is established the structure 31 and is a plurality of the setting of card mouth 12 complex is established, so that everywhere homoenergetic of bottom 30 is installed comparatively steadily on casing 10, further, four the card is established the structure 31 and is located respectively four edges of bottom 30, owing to card establishes the structure 31 have with the pulling force that bottom 30 was dragged upwards, consequently, so that four edges of bottom 30 atress are comparatively unanimous, thereby guarantee bottom 30 each install in casing 10's structural stability.

As shown in fig. 1-4, in an embodiment of the present invention, the flammable volatile substance detector 100 further includes an induced draft fan 40, the induced draft fan 40 is disposed inside the casing 10, the induced draft fan 40 is disposed opposite to the side of the detection circuit board 20, and the casing 10 is further provided with a ventilation opening 13 communicating the inner wall surface and the outer wall surface of the casing 10.

It can be understood that the space in the casing 10 passes through vent 13 communicates with the external world to make the air in the casing 10 circulate with the air phase in the external world, through updraft ventilator 40's setting has strengthened the circulation of air speed of space and external world in the casing 10, thereby promoted the sensitive degree of detection circuit board to the response of easily burning volatile substance, and then promoted the detection efficiency of easily burning volatile substance detector 100.

As shown in fig. 1-4, in an embodiment of the present invention, the casing 10 further has a threading hole communicating with the inner wall surface and the outer wall surface of the casing 10 for threading the flat cable, and the inner wall surface of the threading hole is provided with a thread buckle 50.

It is understood that the detection circuit board 20 is connected to the outside through a communication cable to transmit signals. Through the arrangement of the threading holes, the communication flat cable is convenient to penetrate. In the using process, the communication flat cables are often required to be arranged, so the flat cables are pulled, and the connection ends of the flat cables are easily separated from the detection circuit board 20 in the pulling process of the flat cables because the flat cables are connected with the detection circuit board 20. And through being equipped with the line buckle 50 on the through wires hole to strengthen the internal face of through wires mouth and the frictional force of winding displacement, in order to promote the stability of winding displacement on line buckle 50, thereby guarantee that the winding displacement that is located casing 10 is difficult for droing on detection circuit board 20 at the in-process of dragging.

As shown in fig. 1-4, in an embodiment of the present invention, the detection circuit board 20 is electrically connected to a communication indicator, a fault indicator, an alarm indicator and a power indicator, the casing 10 has further provided a lamp hole 14, the lamp hole 14 has four, the lamp hole 14 is respectively arranged opposite to the communication indicator, the fault indicator, the alarm indicator and the power indicator.

In this embodiment, the lamp hole 14 is provided on the right side plate of the housing 10, and the right side plate further has indication marks, which are respectively in the following characters: the communication, the fault, the alarm and the power supply are respectively and correspondingly arranged on the side edges of the corresponding lamp holes 14, so that the observation is convenient.

So configured, it is possible to observe whether the indicator lamp disposed opposite thereto is turned on through the lamp hole 14, so that the crew member can know the operation of the flammable volatile substance detector 100 in real time. It should be noted that when the communication indicator light is turned on, it means that the flammable volatile substance detector 100 is in communication connection with the control terminal, and performs signal transmission; when the fault indicator light is turned on, it means that the internal electrical components of the flammable volatile substance detector 100 are in fault and are difficult to use normally, and a related technician needs to be called for maintenance; when the alarm indicator light is turned on, the concentration of the flammable volatile matter in the current air is detected to be too high by the flammable volatile matter detector 100, and a crew member needs to detect the luggage articles on the vehicle; when the power indicator lights are illuminated, indicating that the flammable volatile detector 100 has been powered on, it can be used.

As shown in fig. 1-4, in an embodiment of the present invention, the fixing plate 60 is protruded from the outer surface of the casing 10, two fixing plates 60 are provided, the two fixing plates 60 are respectively protruded from two opposite walls of the casing 10, the fixing plate 60 is provided with a first mounting hole 61, and the first mounting hole 61 is provided for the connecting member to penetrate through.

In this embodiment, the two fixing plates 60 are respectively protruded from the lower side of the left side plate and the lower side of the right side plate, and are arranged along the horizontal direction. It will be appreciated that the lower surface of the fixing plate 60 is flush with the lower surface of the cover plate.

In daily use, it is necessary to fix the flammable volatile substance detector 100, and the flammable volatile substance detector 100 is fixed at a slot machine, a wall of a carriage, a luggage placement place, a seat, and the like through the connecting member, which may be a bolt, a screw, a clip, and the like. By the arrangement of the fixing plate 60 and the first mounting hole 61, the flammable volatile matter detector 100 is fixed conveniently.

In addition, the fixed plate 60 has still seted up second mounting hole 62, two mounting holes 62 with first mounting hole 61 interval sets up, second mounting hole 62 specifically is the circular shape through-hole, and in daily use, easily fire volatile substance detector 100 can also be fixed in the seat below, wear to locate through adopting the installed part second mounting hole 62 to be connected with the seat below, so that easily fire volatile substance detector 100 installs in the below of seat, through the setting of second connecting hole 62, so that easily fire volatile substance detector 100 has multiple installation scene.

In the description herein, it is to be understood that the terms "upper", "lower", "left", "right", and the like are used in a descriptive sense and with reference to the illustrated orientation or positional relationship, and are used for convenience in description and simplicity in operation, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used merely for descriptive purposes and are not intended to have any special meaning.

In the description herein, references to the description of "an embodiment," "an example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.

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 appropriately combined to form other embodiments as will be appreciated by those skilled in the art.

The technical principle of the present invention is described above with reference to specific embodiments. The description is made for the purpose of illustrating the principles of the invention and should not be construed in any way as limiting the scope of the invention. Based on the explanations herein, those skilled in the art will be able to conceive of other embodiments of the present invention without any inventive effort, which would fall within the scope of the present invention.

Claims (10)

1. A combustible volatile detector (100), comprising:

the shell (10), an accommodating cavity is formed inside the shell (10), a cover opening (11) communicated with the accommodating cavity is formed below the shell (10), and the shell (10) is also provided with a clamping opening (12) communicated with the inner wall surface and the outer wall surface of the side wall of the shell (10);

the detection circuit board (20) is arranged in the accommodating cavity and is provided with a detection probe (21);

the bottom cover (30), the said bottom cover (30) is covered and located the said cover and set up the mouth (11), the said bottom cover (30) has clamping structure (31), the said clamping structure (31) is at least partly clamped and set up the mouth (12) in the said card;

the clamping structure (31) is clamped on the part of the clamping opening (12) through the clamping opening (12) in a pushing mode, so that the clamping state of the clamping structure (31) and the clamping opening (12) is relieved.

2. The flammable volatile substance detector (100) of claim 1, wherein the fastening structure (31) is a hook, the hook includes an elastic connection portion (311) and a hooking portion (312) connected to each other, the elastic connection portion (311) is protruded from the upper surface of the bottom cover (30), the hooking portion (312) is connected to a side of the elastic connection portion (311) departing from the bottom cover (30), and the hooking portion (312) extends toward the fastening opening (12) and is fastened to the inner wall surface of the fastening opening (12).

3. The combustible volatile detector (100) of claim 2, wherein the upper surface of the hooking portion (312) is disposed obliquely upward from the outside to the inside of the housing (10).

4. The combustible volatile detector (100) of claim 2, wherein the upper surface of the hooking portion (312) is in the shape of a circular arc recessed towards the receiving cavity.

5. The flammable volatile substance detector (100) of claim 1, wherein the engaging structure (31) is an elastic arm, at least a portion of the elastic arm is engaged with the engaging opening, a portion of the elastic arm engaged with the engaging opening is protruded with an elastic protrusion, a circumferential wall of the engaging opening is provided with an engaging groove, and the elastic protrusion is engaged with the engaging groove.

6. The flammable volatile substance detector (100) according to any of claims 1 to 5, wherein the plurality of fastening openings (12) and the plurality of fastening structures (31) are provided, each fastening structure (31) is at least partially fastened in each fastening opening (12), and the plurality of fastening structures (31) are arranged at equal intervals along the circumference of the bottom cover (30).

7. The flammable volatile substance detector (100) of claim 1, wherein the flammable volatile substance detector (100) further comprises an air draft fan (40), the air draft fan (40) is arranged in the shell (10), the side edges of the air draft fan (40) and the detection circuit board (20) are oppositely arranged, and the shell (10) is further provided with a ventilation opening (13) communicated with the inner wall surface and the outer wall surface of the shell (10).

8. The inflammable volatile substance detector (100) of claim 1, wherein the casing (10) is further provided with a threading hole communicating with the inner wall surface and the outer wall surface of the casing (10) for threading a flat cable, and a thread buckle (50) is clamped on the inner wall surface of the threading hole.

9. The flammable volatile substance detector (100) according to claim 1, wherein the detection circuit board (20) is electrically connected with a communication indicator light, a fault indicator light, an alarm indicator light and a power indicator light, the housing (10) is further provided with four lamp holes (14), and the four lamp holes (14) are respectively opposite to the communication indicator light, the fault indicator light, the alarm indicator light and the power indicator light.

10. The inflammable volatile substance detector (100) according to any one of claims 7 to 9, wherein two fixing plates (60) are convexly provided on the outer surface of the casing (10), the two fixing plates (60) are respectively convexly provided on two opposite wall surfaces of the casing (10), the fixing plate (60) is provided with a first mounting hole (61), and the first mounting hole (61) is provided for a connecting piece to penetrate through.

Images