Digital television mainboard integrated with intelligent mainboard

Abstract

The utility model discloses a digital television mainboard integrated with an intelligent mainboard, which comprises a television mainboard and a mainboard carrier, the mainboard carrier is in a frame shape, the television mainboard is arranged on the mainboard carrier through a fastener, and the digital television mainboard is characterized in that two sides of the upper end of the mainboard carrier are connected with bracket bearing rods in a sliding manner; and a plurality of groups of dust removal mechanisms are fixedly mounted on the bracket bearing rod and are symmetrically distributed. The beneficial effects of the utility model lie in that the oppositely distributed dust removal mechanism composed of the airflow blowing unit and the air exhaust dust removal unit can be installed in the digital television along with the circuit mainboard during installation, and when the digital television mainboard is used for a long time, the surface of the digital television mainboard is covered with much dust; the device can replace manpower to carry out efficient and comprehensive blowing dust removal operation on the surface of the mainboard through electric control driving, it is ensured that the heat dissipation effect of all electric appliance components on the mainboard is stable, and therefore it is ensured that the working state is stable.

Description

Technical Field

[0001] This utility model relates to the field of motherboards, specifically to a digital TV motherboard with an integrated smart motherboard. Background Technology

[0002] Digital Television (DTV) is a television system where signals are processed digitally throughout the entire process, from program acquisition, production, and transmission to the user end. This means that digital signals, or digital sequences composed of 0s and 1s, are used at every stage from the studio to transmission and reception. Digital television is the third generation of television, following black-and-white analog television and color analog television, and is a concept relative to analog television. Compared to analog television, digital television offers higher picture quality, more powerful functions, better sound effects, richer content, and often includes interactive and communication capabilities.

[0003] During the production and assembly of digital TVs, the internal components typically include a circuit board. However, digital TV motherboards are usually quite large and undergo prolonged use after installation in the TV housing. Over time, dust tends to accumulate on the surface of the motherboard, covering the various electronic components and affecting their heat dissipation. This can lead to unstable operation of the components and make dust cleaning difficult. Furthermore, user-initiated disassembly and cleaning of the digital TV motherboard can damage the circuit layout, potentially causing the motherboard to malfunction. Utility Model Content

[0004] The technical problem to be solved by this utility model is to provide a digital TV motherboard with an integrated intelligent motherboard that is equipped with an automated dust removal mechanism to clean the dust from the TV motherboard and ensure its stable heat dissipation, in light of the current state of the technology.

[0005] This utility model is achieved through the following technical solution: This utility model proposes a digital TV motherboard with an integrated intelligent motherboard, including a TV motherboard and a motherboard carrier. The motherboard carrier is frame-shaped, and the TV motherboard is installed on the motherboard carrier by fasteners. The feature is that: the upper ends of the motherboard carrier are slidably connected to the two sides of the support rods, and a dust removal mechanism is fixedly installed on the support rods. The dust removal mechanism consists of multiple groups and is symmetrically distributed. The symmetrically distributed dust removal mechanism is divided into an airflow blowing unit and an air extraction dust removal unit.

[0006] By adopting the above technical solution, the airflow purging unit and the extraction dust removal unit are symmetrically distributed. The airflow purging unit can perform blowing operation, and the extraction dust removal unit can perform extraction operation. This allows the airflow purging unit to blow up the dust covering the TV motherboard, and then the extraction dust removal unit to extract, filter and collect the floating dust, thus completing an efficient dust removal operation.

[0007] Furthermore, a bearing base is fixedly installed at the lower end of each of the support rods, and a T-shaped slider seat is fixedly installed at the lower end of each bearing base. An electric slide rail is provided at the connection between the main board carrier and the T-shaped slider seat, and the T-shaped slider seat slides along the length of the electric slide rail.

[0008] By adopting the above technical solution, the electric slide rail can drive the T-shaped slider seat to move and slide, thereby driving the bearing base and the support rod to move and improve the operational flexibility of the dust removal mechanism.

[0009] Furthermore, both the airflow purging unit and the extraction dust removal unit are provided with airflow chambers, and inclined ventilation grooves are provided on the adjacent end faces of the airflow purging unit and the extraction dust removal unit, and the inclined ventilation grooves are connected to the airflow chambers.

[0010] By adopting the above technical solution, the inclined ventilation groove is set at an angle to facilitate the blowing and evacuation of the surface of the TV motherboard.

[0011] Furthermore, a built-in dust filter is detachably installed at one end of the airflow chamber adjacent to the inclined ventilation groove, an upper dust filter is detachably installed on one side of the built-in dust filter in the airflow chamber, and a port dust filter is detachably installed on the other side of the built-in dust filter in the airflow chamber.

[0012] By adopting the above technical solution, the built-in dust removal filter can be used to remove dust from the air drawn by the extraction dust removal unit, the upper dust removal filter can remove some lightweight floating dust, and the port dust removal filter can be used to remove dust from the air drawn by the airflow purging unit.

[0013] Furthermore, an embedded fan is fixedly installed between the port dust filter and the built-in dust filter.

[0014] By adopting the above technical solution, the embedded fan, as an airflow driving device, can drive the surrounding airflow and generate wind direction airflow.

[0015] Furthermore, the upper dust removal filter is installed at an angle, and the tilt angle of the upper dust removal filter corresponds to the tilt angle of the inclined ventilation groove.

[0016] By adopting the above technical solution, the upper dust filter mainly functions to filter and collect fine dust particles with strong buoyancy.

[0017] Furthermore, mounting connection holes are provided at the four corners of the upper end of the TV motherboard, and the mounting connection holes penetrate the TV motherboard.

[0018] By adopting the above technical solution, the mounting connection hole can be used for the fixed installation of the TV motherboard.

[0019] Furthermore, mounting brackets are formed at the four corners of the inner sidewall of the motherboard carrier, and mounting bracket mounting holes are provided at the corresponding positions of the mounting brackets and the mounting connection holes.

[0020] By adopting the above technical solution, the mounting bracket can support the TV motherboard, and the mounting holes of the bracket and the mounting connection holes can be connected by fasteners such as bolts.

[0021] Compared with the prior art, this utility model has the following advantages:

[0022] This utility model, by setting up a dust removal mechanism composed of an airflow blowing unit and an air extraction dust removal unit in a relatively distributed manner, can be installed inside the digital TV along with the circuit board during installation. When the surface of the digital TV motherboard is covered with a lot of dust after a long period of use, it can replace manual labor and be driven by electronic control to perform efficient and comprehensive blowing and dust removal on the surface of the motherboard, ensuring stable heat dissipation of various electrical components on the motherboard, thereby ensuring its stable working state. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the structure of a digital TV motherboard with an integrated intelligent motherboard as described in this utility model;

[0024] Figure 2 This is a rear view of a digital TV motherboard with an integrated intelligent motherboard as described in this utility model;

[0025] Figure 3 This is a schematic diagram showing the connection relationship between the motherboard carrier and the support rod in a digital TV motherboard with an integrated intelligent motherboard as described in this utility model;

[0026] Figure 4 This is a schematic diagram of the structure of the dust removal filter screen at the separation port of the dust removal mechanism in a digital TV motherboard with an integrated intelligent motherboard, as described in this utility model.

[0027] Figure 5This utility model describes a digital TV motherboard with an integrated intelligent motherboard. Figure 4 A bottom view;

[0028] Figure 6 This is a cross-sectional view of the dust removal mechanism in a digital TV motherboard with an integrated intelligent motherboard as described in this utility model;

[0029] Figure 7 This is a cross-sectional plan view of the dust removal mechanism in a digital TV motherboard with an integrated intelligent motherboard as described in this utility model.

[0030] The annotations in the attached figures are explained as follows:

[0031] 1. TV mainboard; 101. Mounting connection hole; 2. Mainboard carrier; 201. Mounting support; 202. Support mounting hole; 3. Electric slide rail; 4. Support base; 5. T-shaped slider seat; 6. Bracket support rod; 7. Dust removal mechanism; 701. Airflow purging unit; 702. Exhaust dust removal unit; 703. Airflow chamber; 704. Sloping ventilation groove; 705. Built-in dust removal filter; 706. Top-mounted dust removal filter; 707. Port dust removal filter; 708. Embedded fan. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0033] like Figure 1 , Figure 2 and Figure 6 As shown, a digital TV motherboard with an integrated smart motherboard in this embodiment includes a TV motherboard 1 and a motherboard carrier 2. The motherboard carrier 2 is frame-shaped, and the TV motherboard 1 is mounted on the motherboard carrier 2 by fasteners. The feature is that: the upper ends of the motherboard carrier 2 are slidably connected to the two sides of the support rods 6, and the support rods 6 are fixedly mounted with dust removal mechanisms 7. The dust removal mechanisms 7 are composed of multiple groups and are symmetrically distributed. The symmetrically distributed dust removal mechanisms 7 are divided into airflow blowing unit 701 and air extraction dust removal unit 702.

[0034] This application embodiment provides a digital TV motherboard with an integrated smart motherboard equipped with an automated dust removal mechanism to clean dust from the TV motherboard and ensure stable heat dissipation. This solves the problem in the prior art where dust easily accumulates on the surface of the TV motherboard after prolonged use, affecting the heat dissipation of various electrical components and causing instability in their operation. The overall approach to solving this problem is as follows: by setting up symmetrically distributed dust removal mechanisms 7, corresponding airflow blowing unit 701 and extraction dust removal unit 702 are formed, wherein the airflow blowing... Unit 701 can filter the surrounding air and blow it onto the surface of the TV motherboard 1. Then, the dust extraction unit 702 extracts the airflow of dust and filters and collects the dust. Because the blowing and extraction are carried out simultaneously, the dust cleaning operation is more efficient and comprehensive, and the dust is prevented from floating in the surrounding air after being blown away and then naturally settling and covering the TV motherboard 1 again. In addition, the dust removal mechanism 7 can be electrically controlled to slide, so that the working range of the dust removal mechanism 7 can be more flexible, and can automatically perform comprehensive cleaning operations instead of manual labor, further improving the cleaning effect of the dust removal operation.

[0035] like Figures 3-5 As shown, a bearing base 4 is fixedly installed at the lower end of the support rod 6, and a T-shaped slider seat 5 is fixedly installed at the lower end of the bearing base 4. An electric slide rail 3 is provided at the connection between the main board carrier 2 and the T-shaped slider seat 5. The T-shaped slider seat 5 slides and connects with the electric slide rail 3 along its length.

[0036] In one implementation, the electric slide rail 3 can electrically drive the T-shaped slider seat 5 to slide, thereby driving the bearing base 4 and the support bearing rod 6 to move, so that the support bearing rod 6 can drive the dust removal mechanism 7 to perform a more comprehensive dust cleaning operation.

[0037] like Figure 6 and Figure 7 As shown, both the airflow purging unit 701 and the extraction dust removal unit 702 are provided with airflow chambers 703. An inclined ventilation groove 704 is provided on one of the adjacent end faces of the airflow purging unit 701 and the extraction dust removal unit 702. The inclined ventilation groove 704 is connected to the airflow chamber 703.

[0038] As one implementation method, the airflow purging unit 701 and the extraction dust removal unit 702 can be interchanged to improve operational flexibility. The airflow purging unit 701 can draw air from the side into the airflow chamber 3 and discharge it through the inclined ventilation groove 704, purging it obliquely towards the surface of the TV motherboard 1. This allows the airflow to blow up the dust adhering to the surface of the TV motherboard 1. At the same time, the extraction dust removal unit 702 can extract the dust blown up by the airflow through the inclined ventilation groove 704, allowing the airflow to carry the dust through the inclined ventilation groove 704 into the airflow chamber 703.

[0039] like Figure 6 and Figure 7 As shown, a built-in dust filter 705 is detachably installed at one end of the inclined ventilation slot 704 in the airflow chamber 703. An upper dust filter 706 is detachably installed on one side of the built-in dust filter 705 in the airflow chamber 703. A port dust filter 707 is detachably installed on the other side of the built-in dust filter 705 in the airflow chamber 703.

[0040] In one implementation, when the dust blown up by the airflow in the extraction dust removal unit 702 is drawn into the airflow chamber 703 through the inclined ventilation groove 704, the built-in dust removal filter 705 mainly functions to filter and collect dust particles with larger size and weak buoyancy, the upper dust removal filter 706 mainly functions to filter and collect floating dust particles with finer size and stronger buoyancy, and the port dust removal filter 707 mainly functions to filter the external air drawn by the airflow purging unit 701 to prevent larger dust particles from impacting the TV motherboard 1 with the airflow.

[0041] like Figure 6 and Figure 7 As shown, an embedded fan 708 is fixedly installed between the port dust filter 707 and the built-in dust filter 705;

[0042] As one implementation method, the embedded fan 708 mainly functions to drive the movement of the surrounding air, form an airflow, and complete the airflow purging operation under the guidance of the airflow chamber 703.

[0043] like Figures 3-5 As shown, the upper dust filter 706 is installed at an angle, and the tilt angle of the upper dust filter 706 corresponds to the tilt angle of the inclined ventilation groove 704.

[0044] As one implementation method, the inclined arrangement of the top-mounted dust filter 706 can meet the impact of the upper airflow, making its filtration and collection of finer, more buoyant dust particles more comprehensive.

[0045] like Figures 1-3As shown, the TV motherboard 1 has four mounting connection holes 101 at the top corners, and the mounting connection holes 101 penetrate the TV motherboard 1; the motherboard carrier 2 has four mounting support seats 201 at the inner sidewall corners, and the mounting support seats 201 and the mounting connection holes 101 have mounting support holes 202 at the corresponding positions.

[0046] As one implementation method, this allows the TV motherboard 1 to establish a stable installation connection with the motherboard carrier 2, preventing loosening. At the same time, it ensures that the bracket support rod 6 and the dust removal mechanism 7 can maintain a certain distance from the TV motherboard 1, ensuring the operational stability of the dust removal mechanism 7, and also preventing any impact on the electrical components on the TV motherboard 1.

[0047] The specific implementation process of this embodiment is as follows: During use, the T-shaped slider seat 5 can reciprocate under the action of the electric slide rail 3, thereby driving the support rod 6 and the dust removal mechanism 7 to reciprocate synchronously. The airflow blowing unit 701 and the extraction dust removal unit 702 of the dust removal mechanism 7 can change their orientation as they move, changing the air blowing direction of the dust removal mechanism 7. This prevents some dust from being trapped on the back of the electrical components on the TV motherboard 1, so that the airflow blown out by the airflow blowing unit 701 is blocked by the electrical components. After changing the blowing direction, the reciprocating dust removal mechanism 7 can clean the dust on the back of the electrical components compared to the first airflow direction. The airflow blowing unit 701 can draw the side air into the airflow chamber 3 and discharge it through the inclined ventilation groove 704. The surface of the TV motherboard 1 is swept at an angle, allowing the airflow to blow up the dust adhering to the surface of the TV motherboard 1. At the same time, the extraction dust removal unit 702 can extract the dust blown up by the airflow through the inclined ventilation channel 704, allowing the airflow to carry the dust through the inclined ventilation channel 704 into the airflow chamber 703. The built-in dust removal filter 705 filters and collects larger dust particles with weak buoyancy, while the upper dust removal filter 706 filters and collects finer floating dust particles with strong buoyancy. The port dust removal filter 707 can filter the external air extracted by the airflow sweeping unit 701 to prevent larger dust particles from impacting the TV motherboard 1 with the airflow. After the dust removal and cleaning is completed, the heat dissipation effect of the electrical components on the TV motherboard 1 is not affected by the dust, thereby ensuring the stable operation of the TV motherboard 1.

[0048] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A digital television main board with integrated intelligence, comprising a television main board (1) and a main board carrier (2), the main board carrier (2) being frame-shaped, the television main board (1) being mounted on the main board carrier (2) by means of fastening elements, characterized in that: The upper end of the main plate carrier (2) is slidably connected with a support carrier rod (6), and a dust removal mechanism (7) is fixedly installed on the support carrier rod (6).

2. The digital television main board of claim 1, wherein: The lower end of the support carrier rod (6) is fixedly installed with a carrier base (4), and the lower end of the carrier base (4) is fixedly installed with a T-shaped sliding block seat (5).

3. A digital TV motherboard with an integrated intelligent motherboard according to claim 1, characterized in that: The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702).

4. The digital television main board of claim 3, wherein: the main board is an integrated intelligent main board. The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702).

5. A digital TV motherboard with an integrated intelligent motherboard according to claim 4, characterized in that: The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702).

6. The digital television motherboard of claim 5, wherein: The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702).

7. A digital TV motherboard with an integrated intelligent motherboard according to claim 1, characterized in that: The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702).

8. The digital television motherboard of claim 7, wherein: The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702). The airflow cavity (703) is provided in the airflow sweeping machine group (701) and the air exhaust dust removal machine group (702), and the airflow cavity (703) is communicated with the inclined ventilation groove (704) provided on one end surface of the airflow sweeping machine group (701) and the air exhaust dust removal machine group (

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