CN216965454U

CN216965454U - But anti-blocking structure is prevented in jetting of real-time supervision protection

Info

Publication number: CN216965454U
Application number: CN202220524863.9U
Authority: CN
Inventors: 张鹏飞; 孙吉鹏; 李季; 于智泓
Original assignee: Kyushu Tianhe Shandong Intelligent Technology Co ltd
Current assignee: Kyushu Tianhe Shandong Intelligent Technology Co ltd
Priority date: 2022-03-10
Filing date: 2022-03-10
Publication date: 2022-07-15
Anticipated expiration: 2032-03-10

Abstract

A blowing anti-blocking structure capable of monitoring and protecting in real time comprises a blowing assembly and a blowing main body, wherein the blowing assembly is positioned at the top of the blowing main body, and a plurality of blowing assemblies are arranged in the blowing main body; the jetting assembly comprises an anti-blocking detection component, the anti-blocking detection component comprises a pressure sensor, the pressure sensor can sense the pressure generated by gas at the aperture of the jetting nozzle, and then the pressure sensor outputs a correspondingly changed data signal according to the jetting condition to detect whether the jetting assembly is abnormal or not.

Description

But anti-blocking structure is prevented in jetting of real-time supervision protection

Technical Field

The application relates to the technical field of dry separation equipment, in particular to a blowing anti-blocking structure which is compact in structure, safe, reliable, convenient to position and install, intelligent, efficient and capable of monitoring and protecting in real time.

Background

The intelligent dry separator is different from the traditional coal separation method, adopts big data calculation and intelligent identification technology, establishes an analysis model suitable for different coal quality characteristics according to the different coal quality characteristics, carries out digital identification on coal and gangue, opens an electromagnetic valve after identification, and blows an object needing to be removed through instantaneous high-pressure gas, thereby obtaining a product with higher qualification rate.

The blowing device has a great influence on the separation performance of the intelligent dry separator, and the smoothness of the blowing path directly influences the blowing separation effect of the dry separator. However, the blowing path of the dry separation equipment at the present stage is often blocked, so that real-time monitoring and protection cannot be realized, the nozzle is not easy to detect after being blocked, and cannot be fed back in time, and the blowing separation effect is seriously influenced.

Disclosure of Invention

The utility model provides a but the not enough of above-mentioned prior art is solved to the purpose of this application, provides a compact structure, safe and reliable, location installation convenient, intelligent high efficiency, real-time supervision protection's jetting prevents stifled structure.

The technical scheme adopted by the application for solving the technical problem is as follows:

a blowing anti-blocking structure capable of monitoring and protecting in real time comprises a blowing assembly and a blowing main body, wherein the blowing assembly is positioned at the top of the blowing main body, and a plurality of blowing assemblies are arranged in the blowing main body;

the jetting assembly comprises an anti-blocking detection component, the anti-blocking detection component comprises a pressure sensor, the pressure sensor can sense the pressure generated by gas at the aperture of the jetting nozzle, and then the pressure sensor outputs a correspondingly changed data signal according to the jetting condition to detect whether the jetting assembly is abnormal or not.

Furthermore, the jetting assembly comprises a bypass air inlet cover positioned on the outer side of the jetting plate, and when the device works, air continuously enters through the bypass air inlet cover, and then enters the inner cavity of the jetting plate.

Further, including on the blowing board with bypass air inlet cover matched with annular groove, first rubber pad card is gone into in the annular groove, with bypass air inlet cover and the laminating of first rubber pad compress tightly fixedly.

Furthermore, the blowing plate is provided with a bypass which is in one-to-one correspondence with the blowing aperture and penetrates through the first hole site,

and two ends of the first hole site are respectively connected with the inner cavity of the bypass air inlet cover and the pressure sensor.

Furthermore, the bypass air inlet cover is fixed with the blowing plate through a bolt, and a first rubber pad with a round hole and a hole diameter smaller than that of the fixed bolt is arranged between the bolt and the bypass air inlet cover, so that the bolt penetrates through the first rubber pad without a gap.

Further, the jetting assembly comprises a jetting nozzle, the jetting nozzle comprises a jetting nozzle aperture, gas is jetted outwards in the radial direction through the jetting nozzle aperture, and the jetting nozzle aperture is designed for a laval-type curve.

Furthermore, the blowing assembly comprises a dustproof baffle plate, the dustproof baffle plate is arranged on the upper edge of the blowing nozzle, and the length of the dustproof baffle plate can cover the aperture of the blowing nozzle.

Further, the blowing board with including transition dust guard between the blowing nozzle, the inside transition dust guard aperture that is cascaded setting of dust guard that includes of transition dust guard, produce the boss between dust guard aperture and the blowing nozzle aperture in the transition, can reduce the direct injection board inner chamber that gets into of dust.

Furthermore, the jetting main part still includes material conveyer belt and protection drainage baffle, protection drainage baffle is located between material conveyer belt and the jetting assembly, prevents that the material from striking the jetting nozzle at the removal in-process.

Further, the blowing body includes a blowing shroud located outside of the blowing assembly; the blowing shield comprises a bottom cover, an upper cover and an upper sealing assembly, and the bottom cover, the upper cover and the upper sealing assembly are connected; the upper sealing assembly is composed of a sealing rubber mat and a pressing plate, and the sealing rubber mat is located at the bottom of the pressing plate and connected with the upper cover.

The blowing body comprises a front inspection cover and a rear inspection cover; the front inspection cover comprises a pressing plate with a lifting hole, so that the front inspection cover is convenient to lift and inspect; the lower edge and two sides of the rear inspection cover are provided with a positioning plate and an installation clamping plate, so that the inspection cover can be conveniently detached and installed during inspection and maintenance.

Compared with the prior art, the beneficial effects obtained by the application are as follows:

1. in the operation process of the dry separator, air is continuously fed through the bypass air inlet cover, and the air enters the blowing nozzle to form positive pressure, so that dust is prevented from entering the blowing nozzle.

2. When the blowing action is performed, the pressure sensor outputs a data signal with corresponding change, and when the output of the blowing data signal is abnormal, the blowing hole is blocked, so that the effect of monitoring the blowing hole diameter in real time is achieved.

3. When the dry separator operates, the blowing nozzle which does not act for a long time is monitored, and air blowing and ash discharging can be carried out according to a material conveying rule, namely, air blowing action is carried out when no material passes through, and the aperture of the blowing aperture is kept smooth.

4. The blowing plate is provided with an annular groove matched with the bypass air inlet cover, the rubber pad matched with the annular groove is clamped into the groove, and the bypass air inlet cover and the rubber pad are attached, pressed and fixed, so that the sealing effect is ensured.

5. The bypass air inlet cover is fixed with the blowing plate through a bolt, and a rubber pad with the aperture smaller than that of the fixed bolt is additionally arranged between the bolt and the bypass air inlet cover, so that the bolt penetrates through the rubber pad without a gap, and the air tightness is ensured after the bolt is tightly pressed.

6. The dustproof baffle is arranged on the upper edge of the blowing nozzle, and plays a role in dustproof buffering.

7. And a protective drainage baffle is arranged between the material conveying belt and the blowing module to prevent the material from impacting the nozzle.

8. The periphery of the blowing assembly is provided with a blowing shield which plays a role in protecting the blowing assembly and can buffer the impact of the blowing sorted objects.

9. The blowing shield is provided with an upper sealing assembly which consists of a sealing rubber pad and a pressing plate, so that the sealing performance of the blowing module is ensured, and dust is prevented from entering the blowing shield through the upper cover.

10. The front inspection cover is provided with a pressing plate with a lifting hole, so that the lifting inspection is facilitated. The lower edge and two sides of the rear inspection cover are provided with positioning and mounting clamping plates, so that the inspection cover can be conveniently detached and mounted during inspection and maintenance.

11. A transition dust-proof plate is arranged between the blowing plate and the blowing nozzle, and a boss is generated between the transition dust-proof plate and the blowing nozzle through a stepped structure of the aperture of the transition dust-proof plate, so that dust can be further reduced to directly enter an inner cavity of the blowing plate.

12. The Laval curve design of the aperture of the blowing nozzle can improve the blowing strength.

Drawings

Figure 1 is a side view of the overall construction of the blowing device of the present application.

Figure 2 is an elevational view of the overall construction of the blowing device of the present application.

Figure 3 is a side view of the blowing assembly configuration of the present application.

Figure 4 is an elevation view of the blowing plate structure of the present application.

Fig. 5a, 5c, 5d, 5e are sectional side views of the blowing assembly of the present application at different positions, respectively.

FIG. 5b is an enlarged view of a portion of the transition gray plate of the present application.

Figure 6 is a schematic view of the present application of blow protection.

Figure 7 is a schematic view of a blowing shroud configuration of the present application.

FIG. 8 is a schematic view of the upper seal assembly configuration of the present application.

Fig. 9 is a schematic view of the front inspection cover structure of the present application.

Fig. 10 is a schematic view of a rear inspection cover structure of the present application.

Reference numbers in the figures:

the device comprises a blowing assembly 1, a blowing shield 2, a front inspection cover 3, a rear inspection cover 4, a cover plate 5, a cable outlet 6, a metal hose 7, a flange 8, a bypass air inlet cover 9, a pressure sensor 10, an electromagnetic valve 11, a main valve plate 12, a blowing plate 13, a blowing nozzle 14, a dust-proof baffle 15, an air injection side plate 16, a material conveying belt 17, a protective drainage baffle 18, a bottom cover 19, an upper cover 20, an upper sealing assembly 21, a sealing rubber gasket 22, a first pressing plate 23, a lifting hole 24, a second pressing plate 25, a positioning plate 26, a mounting clamping plate 27, an annular groove 28, a first rubber gasket 29, a bolt 30, a second rubber gasket 31, a first hole position 32, a blowing plate inner cavity 33, a compressed air inlet 34, a main plate valve inner cavity 35, a pilot air inlet 36, a pilot air hole inner cavity 37, a transition dust-proof plate 38, a boss 39 and a blowing nozzle aperture 40.

Detailed Description

Hereinafter, the present application will be further described based on preferred embodiments with reference to the accompanying drawings.

In addition, for convenience of understanding, various components on the drawings are enlarged (thick) or reduced (thin), but this is not intended to limit the scope of the present application.

Singular references also include plural references and vice versa.

In the description of the embodiments of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the application is used, the description is only for convenience of describing the application and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and be operated, and thus, the limitation of the application is not understood. Moreover, the terms first, second, etc. may be used in the description to distinguish between various elements, but these should not be limited by the order of manufacture or by importance to be understood as indicating or implying any particular importance, such as may be found in various claims.

The terminology used in the description presented herein is for the purpose of describing embodiments of the application and is not intended to be limiting of the application. It is also to be understood that, unless otherwise expressly stated or limited, the terms "disposed," "connected," and "connected" are intended to be open-ended, i.e., may be fixedly connected, detachably connected, or integrally connected; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The above-mentioned meanings specifically ascribed to the present application will be understood to those skilled in the art.

Fig. 1 is a side view of the overall structure of the blowing device of the present application, and fig. 2 is a front view of the overall structure of the blowing device of the present application. Referring to fig. 1 and 2, a blowing anti-blocking structure capable of monitoring and protecting in real time includes a blowing assembly 1 and a blowing main body, wherein the blowing assembly 1 is a gas blowing port during operation, and the blowing assembly 1 is located at the top of the blowing main body.

In this embodiment, the number of the blowing assemblies 1 is plural, that is, the blowing body includes a plurality of the blowing assemblies 1 therein.

The bottom of the blowing body comprises a metal hose 7 and a flange 8, and the metal hose 7 is communicated with the air inlet end to play a role in buffering transition. The flange 8 may be a cover for a prepared hole.

Figure 3 is a schematic view of a blowing assembly configuration of the present application. Figure 4 is an elevation view of the blowing plate structure of the present application. Fig. 5a, 5c, 5d, 5e are side sectional views of the blowing assembly of the present application in different positions, respectively. FIG. 5b is an enlarged view of a portion of the transition gray plate of the present application. Figure 6 is a schematic view of the present application of blow protection. Referring to fig. 1 to 6, the blowing assembly 1 includes a bypass inlet cover 9, a pressure sensor 10, an electromagnetic valve 11, a main valve plate 12, a blowing plate 13, a blowing nozzle 14, a dust-proof baffle 15, and a side blowing plate 16. Wherein, the outside of the blowing assembly 1 comprises a blowing plate 13, a blowing nozzle 14 and a gas injection side plate 16.

The bypass air inlet cover 9, the pressure sensor 10, the blowing plate 13, the annular groove 28, the first rubber pad 29, the bolt 30, the second rubber pad 31 and the first hole site 32 form an anti-blocking detection assembly in the embodiment.

The electromagnetic valve 11 is used for controlling the blowing assembly 1 to realize blowing action.

Further, the blowing nozzle 14 includes a blowing nozzle aperture 40, and the gas is ejected outward through the blowing nozzle aperture 40.

In the alternative of this embodiment, the aperture 40 of the blowing nozzle is designed by a laval curve, so that the blowing force can be improved.

Further, the jetting main part still includes material conveyer belt 17 and protection drainage baffle 18, protection drainage baffle 18 is located between material conveyer belt 17 and the jetting assembly 1, can prevent that the material from striking jetting nozzle 14 in the removal process, causing the jetting nozzle to damage.

Further, the material transmission belt 17 is located on the upper side of the blowing assembly 1, and when the material transmission belt is used, the blowing nozzle 14 of the blowing assembly 1 blows gas upwards.

In this embodiment alternative, include transition dust guard 38 between blowing board 13 and blowing nozzle 14, inside transition dust guard 38 including being cascaded setting's transition dust guard aperture makes produce boss 39 between transition dust guard aperture and blowing nozzle aperture 40, can reduce the direct entering blowing board inner chamber 33 of dust.

Furthermore, the dustproof baffle 15 is arranged on the upper edge of the blowing nozzle 14, and plays a dustproof buffering effect.

In an alternative of this embodiment, the dust-proof baffle 15 is disposed on one side of the blowing nozzle 14, that is, the dust-proof baffle 15 passes through one side of the blowing nozzle 14 first when the material transmission belt 17 is conveyed, so that a better dust-proof effect of the dust-proof baffle 15 can be achieved.

In the alternative of this embodiment, the length of the dust-proof baffle 15 in the horizontal direction needs to cover the blowing nozzle aperture 40 of the blowing nozzle 14, and at this time, when the material is on the material conveyor 17 during the moving process, the dust also moves along with the material conveyor 17, and the dust can be prevented from falling into the aperture of the blowing nozzle aperture 40 due to the inertia effect during the falling process.

Referring to fig. 6, the blowing plate 13 includes an annular groove 28 matching with the bypass air inlet cover 9, and is used for clamping the first rubber pad 29 matching with the annular groove 28, and attaching, pressing and fixing the bypass air inlet cover 9 and the first rubber pad 29, so as to ensure the sealing effect.

The bypass air inlet cover 9 is fixed with the blowing plate 13 through a bolt 30, a second rubber pad 31 with a round hole and a hole diameter smaller than that of the fixed bolt 30 is arranged between the bolt 30 and the bypass air inlet cover 9, so that the bolt 30 penetrates through the second rubber pad 31 without a gap, and the air tightness is ensured after the bolt 30 is tightly pressed.

In the operation process, the air continuously enters through the bypass air inlet cover 9, and the air enters the inner cavity 33 of the blowing plate to form positive pressure, so that dust is prevented from entering.

The blowing plate 13 is provided with a bypass which is in one-to-one correspondence with the blowing aperture and penetrates through the first hole site 32. One end of the first hole 32 is communicated with the inner cavity of the bypass air inlet cover 9, and the other end is provided with a pressure sensor 10. During operation, the pressure sensor 10 can sense the pressure generated by the gas at the aperture of the blowing nozzle, and then the pressure sensor 10 outputs a correspondingly changed data signal according to the blowing condition to detect the working condition of the dry separator.

Referring to fig. 5a to 5d, three gas lines are respectively disposed inside the dry separator,

a blowing starting circuit: the pilot gas enters the electromagnetic valve pilot gas hole inner cavity 37 communicated with the electromagnetic valve pilot gas hole through the pilot gas inlet 36, the electromagnetic valve 11 is driven to work, and the injection action is controlled by the electromagnetic valve 11.

Anti-blocking detection of the line: the bypass air inlet cover 9 continuously admits air, and air enters the blowing plate inner cavity 33 to prevent dust in the blowing plate inner cavity 33 from entering, and meanwhile, the pressure sensor 10 realizes detection by detecting the pressure in the blowing plate inner cavity 33.

A blowing line: compressed air enters the main plate valve cavity 35 through compressed air inlet 34. The inner cavity 35 of the main valve plate is communicated with the electromagnetic valve 11 to provide blowing compressed air.

Fig. 7 is a schematic view of a blowing shroud configuration of the present application. FIG. 8 is a schematic view of the upper seal assembly configuration of the present application. Fig. 9 is a schematic view of the front inspection cover structure of the present application. Fig. 10 is a schematic view of a rear inspection cover structure of the present application. Referring to fig. 1 to 10, the blowing body includes a blowing shroud 2, a front inspection cover 3, a rear inspection cover 4, and a cover plate 5, and the blowing shroud 2, the front inspection cover 3, the rear inspection cover 4, and the cover plate 5 are located outside the blowing body and are used for protecting a device inside the blowing body.

Specifically, the periphery of the blowing assembly 1 is provided with the blowing shield 2, so that the blowing assembly 1 is protected, and the impact of the blowing sorted objects can be buffered.

The blowing shroud 2 is composed of a bottom cover 19, an upper cover 20 and an upper sealing assembly 21. The bottom cover 19, the upper cover 20 and the upper sealing assembly 21 are connected to hermetically protect the blowing assembly 1.

The upper sealing assembly 21 consists of a sealing rubber gasket 22 and a first pressing plate 23, wherein the sealing rubber gasket 22 is positioned at the bottom of the first pressing plate 23 and is connected with the upper cover 20, so that the sealing performance of the blowing device can be ensured, and dust is prevented from entering the cover from the upper cover.

In the alternative of this embodiment, the length of the upper sealing assembly 21 can cover the top of the upper housing 20 and the connection between the top and the side of the upper housing 20, so that the upper sealing assembly 21 can better ensure the sealing performance of the blowing device.

Further, the front inspection cover 3 comprises a second pressing plate 25 with a lifting hole 24, so that the lifting inspection is facilitated. The lower edge and two sides of the rear inspection cover 4 are provided with a positioning plate 26 and an installation clamping plate 27, so that the disassembly and the installation of the inspection cover during inspection and maintenance are convenient. During the inspection, the blowing body is hoisted through the hoisting hole 24 of the front inspection cover 3, and then the rear inspection cover 4 is opened through the mounting clamping plate 27 of the rear inspection cover 4 for inspecting the blowing body.

The working state of the dry separator is the blowing work. When the dry separation machine starts to perform the blowing action, the pressure sensor 10 outputs a correspondingly changed data signal to be compared with a preset data signal (the preset data signal is a standard value of data measured in the test operation before delivery) when the pressure sensor 10 outputs the correspondingly changed data signal to start to perform the blowing action, and when the blowing data signal is different from the preset data signal, the dry separation machine judges that the output is abnormal, namely, the aperture 40 of the blowing nozzle 14 is blocked, so that the effect of monitoring the blowing aperture in real time is achieved.

When the dry separator operates, the blowing nozzle which does not act for a long time is monitored, and air blowing and ash discharging can be carried out according to a material conveying rule (namely, discontinuously when materials pass through), so that air blowing action is carried out when no materials pass through, and the smoothness of the blowing aperture 40 is kept. The blowing anti-blocking structure (namely, the bypass air inlet cover 9 continuously admits air, and the air enters the inner cavity 33 of the blowing plate) forms positive pressure through continuous air admission, so that dust is prevented from entering.

The effect of real-time monitoring is realized through the output signal change of the pressure sensor 10 during the blowing action. And the blowing blockage is reduced by an air blowing ash discharging mode. The jetting sorting machine has the advantages of strong operability, visual and credible feedback, compact integral structure, safety, reliability, convenience in positioning and installation, intelligence, high efficiency, capability of carrying out real-time monitoring and protection, greatly reduced nozzle blockage condition and improved jetting sorting effect.

While the present invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof as defined in the appended claims.

Claims

1. The utility model provides a but stifled structure is prevented in jetting of real-time supervision protection which characterized in that:

the device comprises a blowing assembly (1) and a blowing body, wherein the blowing assembly (1) is positioned at the top of the blowing body, and a plurality of blowing assemblies (1) are arranged in the blowing body;

the blowing assembly (1) comprises an anti-blocking detection component, the anti-blocking detection component comprises a pressure sensor (10), the pressure sensor (10) can sense the pressure generated by gas at the aperture of the blowing nozzle, and then the pressure sensor (10) outputs correspondingly changed data signals according to the blowing condition to detect whether the blowing assembly (1) is abnormal or not.

2. The blowing anti-blocking structure capable of monitoring and protecting in real time according to claim 1, wherein:

the blowing assembly (1) comprises a bypass air inlet cover (9) positioned on the outer side of the blowing plate (13), and when the blowing assembly works, air continuously enters through the bypass air inlet cover (9) and enters an inner cavity (33) of the blowing plate.

3. The blowing anti-blocking structure capable of monitoring and protecting in real time according to claim 2, characterized in that:

the blowing plate (13) is provided with an annular groove (28) matched with the bypass air inlet cover (9), the first rubber pad (29) is clamped into the annular groove (28), and the bypass air inlet cover (9) and the first rubber pad (29) are attached, pressed and fixed.

4. The blowing anti-blocking structure capable of monitoring and protecting in real time according to claim 2, characterized in that:

the blowing plate (13) is provided with a first hole site (32) through which the bypass corresponding to the blowing hole diameter one by one passes,

and the two ends of the first hole site (32) are respectively connected with the inner cavity of the bypass air inlet cover (9) and the pressure sensor (10).

5. The blowing anti-blocking structure capable of monitoring and protecting in real time according to claim 2, wherein:

the bypass air inlet cover (9) is fixed with the blowing plate (13) through a bolt (30), and a second rubber pad (31) with a round hole and a hole diameter smaller than that of the fixing bolt (30) is arranged between the bolt (30) and the bypass air inlet cover (9), so that the bolt (30) penetrates through the second rubber pad (31) without a gap.

6. The blowing anti-blocking structure capable of monitoring and protecting in real time according to claim 2, wherein:

the blowing assembly (1) comprises a blowing nozzle (14), the blowing nozzle (14) comprises a blowing nozzle aperture (40), gas is sprayed out through the blowing nozzle aperture (40), and the blowing nozzle aperture (40) is designed in a Laval type curve mode.

7. The blowing anti-blocking structure capable of real-time monitoring and protection as claimed in claim 6, wherein:

the blowing assembly (1) comprises a dustproof baffle (15), the dustproof baffle (15) is arranged on the upper edge of the blowing nozzle (14), and the length of the dustproof baffle (15) can cover the blowing nozzle hole diameter (40) of the blowing nozzle (14).

8. The blowing anti-blocking structure capable of monitoring and protecting in real time according to claim 6, wherein:

the improved blowing plate is characterized in that the blowing plate (13) and the blowing nozzle (14) comprise a transition ash prevention plate (38), the transition ash prevention plate (38) comprises a transition ash prevention plate aperture in a stepped arrangement, a boss (39) is generated between the transition ash prevention plate aperture and the blowing nozzle aperture (40), and dust can be reduced to directly enter the blowing plate inner cavity (33).

9. The blowing anti-blocking structure capable of monitoring and protecting in real time according to claim 1, wherein:

the blowing main body further comprises a material conveying belt (17) and a protective drainage baffle (18), wherein the protective drainage baffle (18) is located between the material conveying belt (17) and the blowing assembly (1) and prevents materials from impacting the blowing nozzle (14) in the moving process.

10. The blowing anti-blocking structure capable of monitoring and protecting in real time according to claim 1, characterized in that:

the blowing body comprising a blowing shield (2) located outside the blowing assembly (1); the blowing shield (2) comprises a bottom cover (19), an upper cover (20) and an upper sealing assembly (21), wherein the bottom cover (19), the upper cover (20) and the upper sealing assembly (21) are connected; the upper sealing assembly (21) consists of a sealing rubber gasket (22) and a first pressing plate (23), and the sealing rubber gasket (22) is positioned at the bottom of the first pressing plate (23) and is connected with the upper cover (20);

the blowing body comprises a front inspection cover (3) and a rear inspection cover (4); the front inspection cover (3) comprises a second pressing plate (25) with a lifting hole (24) so as to facilitate lifting inspection; and the lower edge and two sides of the rear inspection cover (4) are provided with a positioning plate (26) and an installation clamping plate (27), so that the inspection cover is convenient to detach and install during inspection and maintenance.