Electrical engineering and automatic dust removal device

Abstract

The invention relates to the technical field of dust removal devices, in particular to an electrical engineering and automatic dust removal device, which adopts a closed-loop circulating ground chain to carry modular equipment, is matched with dust removal design, innovatively integrates triple dust removal mechanisms of an ion tuyere, an electrostatic rod and a mechanical swing rod, and combines filtration and bottom efficient negative pressure exhaust. A dynamic soft rubber mat sealing technology and sealing of a lifting door are matched to form a closed dust removal environment; workpiece autorotation is achieved through unique chain wheel-chain transmission. The dust removal device is reasonable in structure, efficient and automatic dust removal treatment on electrical components is achieved through the reasonable design of the circulating ground chain, the dust removal box, the electrostatic dust removal assembly and the like, the problem of secondary dust pollution in the traditional dust removal technology is avoided, meanwhile, the production efficiency and the product quality are improved, and remarkable economic and social benefits are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of dust removal devices, and particularly relates to an electrical engineering and automation dust removal device. BACKGROUND

[0002] At present, with the development of society, electronic devices are increasingly widely used. In order to improve the production efficiency of electronic devices, the integration and batch production of electrical components of electronic devices have become the norm. Since it is batch production, products are generally packaged after a batch is produced. In the process of production and processing, a large amount of dust is adsorbed on the surface of many electrical component products, thereby reducing the working efficiency and service life of the electrical components. Therefore, dust removal treatment on the surface of the electrical components is particularly important.

[0003] In traditional dust removal technology, the following problems often exist:

[0004] 1. Disadvantages of traditional air gun dust removal

[0005] Secondary pollution: the traditional method usually uses an air gun to directly blow off dust, but this way can blow dust into the air, causing secondary pollution;

[0006] Health hazards: dust suspended in the air poses a threat to the health of operators, and long-term inhalation can cause respiratory diseases;

[0007] Low dust removal efficiency: air gun dust removal is difficult to completely remove dust, especially for components with complex shapes, the dust removal effect is not ideal.

[0008] 2. Limitations of dust removal equipment

[0009] Low degree of automation: existing dust removal equipment is mostly manually operated, which is low in efficiency and difficult to meet the needs of batch production;

[0010] Complex structure, difficult to maintain: some dust removal equipment has a complex structure, high installation and maintenance costs, and is prone to failure;

[0011] Incomprehensive dust removal: traditional equipment is difficult to achieve comprehensive dust removal, especially for components with complex shapes, there are dead angles for dust removal.

[0012] 3. Environmental problems

[0013] Incomplete dust treatment: existing technologies do not completely treat dust, which can easily cause environmental pollution;

[0014] High energy consumption: some dust removal equipment has high energy consumption, which does not meet the requirements of green production.

[0015] Therefore, it can be seen that the prior art has obvious deficiencies in dust removal efficiency, environmental protection and automation, and it is urgent to provide an efficient, environmentally friendly and automated dust removal solution. SUMMARY

[0016] The present application aims to solve the technical problems existing in the prior art, and provides an electrical engineering and automation dust removal device.

[0017] The present application provides an electrical engineering and automation dust removal device, which aims to solve the problems of secondary dust pollution and personnel health in traditional dust removal technology. The device realizes efficient and automated dust removal treatment of electrical components through the rational design of circulating ground chain, dust removal box, electrostatic dust removal assembly and other structures.

[0018] An electrical engineering and automation dust removal device comprises:

[0019] A circulating ground chain is provided with a plurality of evenly distributed support rods, and each support rod is provided at the top with a workpiece tool for placing a workpiece to be dusted. The circulating ground chain carries the workpiece tool back and forth through the support rods to circulate and operate. A dust removal station is provided on the circulating ground chain.

[0020] A dust removal box is provided at the dust removal station position of the circulating ground chain. The top of the dust removal box is provided with an air inlet, and the air inlet is provided with a first filter. A dust removal cavity is provided in the dust removal box. An electrostatic dust removal assembly is provided around the workpiece tool in the dust removal cavity. An air outlet is provided at the bottom of the dust removal cavity. An exhaust fan is provided at the air outlet to exhaust air from the dust removal cavity. A second filter is provided between the air inlet and the air outlet of the exhaust fan.

[0021] A rotating device is provided in the circulating ground chain in the dust removal cavity for rotating the workpiece tool. The rotating device rotates the workpiece tool to rotate the workpiece, and 360-degree dust removal is realized through the electrostatic dust removal assembly.

[0022] Further, the circulating ground chain comprises a rack and a closed-loop conveying chain. The rack is provided with a closed-loop chain track, and the conveying chain is installed in the chain track.

[0023] The conveying chain is connected to the support rod through a pin shaft. The bottom end of the support rod is provided with a sleeve that is sleeved on the top end of the pin shaft. A bearing is provided between the sleeve and the pin shaft. A rotating sprocket is coaxially fixed outside the sleeve.

[0024] A drive motor with a speed reducer is installed at a position in the dust removal cavity of the rack. An output shaft of the drive motor is upwardly provided with a driving sprocket. A rotating driven sprocket is provided near the drive motor on the rack. The driving sprocket and the driven sprocket are connected through a chain transmission. The rotating sprocket can cooperate with the chain. The chain rotation drives the rotating sprocket to rotate.

[0025] Further, the electrostatic dust removal assembly comprises a plurality of ion wind nozzles, a plurality of electrostatic rods and a plurality of energy-saving wands; the outlet of the ion wind nozzle faces the workpiece tool.

[0026] Further, the machine frame is provided with protective covers on both sides of the conveying chain, and a soft rubber pad is arranged between the protective covers on both sides of the conveying chain in the dust removal cavity, which plays a role in plugging the gap between the protective covers on both sides.

[0027] Further, the air outlet of the dust removal cavity is arranged below the machine frame, and the air outlet is provided with an exhaust channel communicated with the dust removal cavity on both sides of the dust cover, and the second filter is arranged between the exhaust channel and the exhaust fan.

[0028] Further, the top of the support rod is provided with a mounting plate, the bottom side of the mounting plate is provided with a sleeve, the sleeve is sleeved on the top of the support rod, and a fastening bolt is arranged between the sleeve and the support rod, and the workpiece tool is arranged on the mounting plate.

[0029] Further, the inlet and outlet positions of the dust removal box are provided with lifting doors, and the lifting doors are provided with air cylinders for controlling the lifting doors to move up and down.

[0030] Further, a feeding and discharging station is arranged on the circulating chain at the outlet position of the dust removal box, and a pretreatment dust removal device is further arranged between the feeding and discharging station and the outlet of the dust removal box on the circulating chain, the pretreatment dust removal device comprises a dust removal cover, the dust removal cover is provided with an exhaust fan, a third air filter is arranged between the exhaust fan and the dust removal cover, and a compressed air dust removal gun for dust removal is arranged in the dust removal cover.

[0031] Compared with the prior art, the present application has the following advantages: the structure of the present application is reasonable, the efficient and automatic dust removal treatment of electrical components is realized through the reasonable design of the circulating chain, the dust removal box and the electrostatic dust removal assembly, the problem of secondary pollution of dust in the traditional dust removal technology is avoided, the production efficiency and product quality are improved, and the economic and social benefits are remarkable.

[0032] Efficient dust removal: through the cooperation of the electrostatic dust removal assembly and the rotating device, 360-degree dust removal of the workpiece can be realized, and the dust removal effect is remarkable.

[0033] Environmental protection and health: the dust in the dust removal box is filtered and discharged through the filter, avoiding secondary pollution of dust, protecting the working environment and the health of personnel.

[0034] High degree of automation: the entire dust removal process is realized through circulating chains and automatic control, reducing manual intervention and improving production efficiency.

[0035] Reasonable structure: the device has compact structure and close cooperation between components, which can effectively prevent dust overflow and ensure the stability and reliability of the dust removal process. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is the dust removal box structure schematic diagram of the double one electrical engineering and automation dust removal device of the application;

[0037] Figure 2 is the first three-dimensional schematic diagram of the double one electrical engineering and automation dust removal device of the application;

[0038] Figure 3 is the second three-dimensional schematic diagram of the double one electrical engineering and automation dust removal device of the application;

[0039] Figure 4 is the circulating chain structure and workpiece tool rotation mechanism schematic diagram of the double one electrical engineering and automation dust removal device of the application;

[0040] Figure 5 is the pretreatment dust removal mechanism schematic diagram of the double one electrical engineering and automation dust removal device of the application;

[0041] Figure 6 is the drive device schematic diagram of the workpiece tool rotation mechanism of the double one electrical engineering and automation dust removal device of the application.

[0042] As shown in the figure: 1, support rod; 2, workpiece tool; 3, dust removal box; 4, air inlet; 5, first filter; 6, dust removal cavity; 7, electrostatic dust removal assembly; 8, air outlet; 9, exhaust fan; 10, second filter; 11, rack; 12, conveying chain; 13, chain track; 14, pin shaft; 15, sleeve; 16, bearing; 17, rotating sprocket; 18, drive motor; 19, driving sprocket; 20, driven sprocket; 21, chain; 22, protective cover; 23, soft rubber pad; 24, exhaust passage; 25, lifting door; 26, air cylinder; 27, dust removal cover; 28, third air filter;

[0043] 101, mounting plate; 102, sleeve; 103, fastening bolt;

[0044] 701, ion air nozzle; 702, electrostatic rod; 703, energy-saving swing rod. DETAILED DESCRIPTION

[0045] In the description of the present application, it needs to be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0046] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specifically limited.

[0047] In the description of the embodiments of the present application, if a certain feature is referred to as "set", "fixed", "connected", "mounted" on another feature, it can be directly set, fixed, connected or mounted on the other feature, or indirectly set, fixed, connected or mounted on the other feature.

[0048] In the description of the embodiments of the present application, if "several" is referred to, it means more than one, if "a plurality of" is referred to, it means more than two, if "greater than", "less than", "exceeds" is referred to, it should be understood as not including the number, if "and above", "and below", "and within" are referred to, it should be understood as including the number. If "first", "second" is referred to, it should be understood as being used to distinguish technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the order of the technical features indicated.

[0049] The embodiments of the present application will be described below with reference to the drawings.

[0050] An electrical engineering and automation dust removal device, comprising:

[0051] A circulating chain is provided with a plurality of evenly distributed support rods 1, and each support rod 1 is provided with a workpiece tool 2 at the top for placing a workpiece to be dusted. The circulating chain carries the workpiece tool 2 through the support rod 1 to reciprocatingly circulate and run, and a dust removal station is arranged on the circulating chain.

[0052] Dust collection box 3 is located at the dust collection station of the circulating ground chain. The top of the dust collection box 3 is provided with an air inlet 4. The air inlet 4 is equipped with a first filter 5. The dust collection box 3 is provided with a dust collection chamber 6. The dust collection chamber 6 is provided with an electrostatic dust removal component 7 surrounding the workpiece fixture. The bottom of the dust collection chamber 6 is provided with an air outlet 8. The air outlet 8 is equipped with an exhaust fan 9 that draws air out of the dust collection chamber 6. A second filter 10 is provided between the inlet and the air outlet 8 of the exhaust fan 9.

[0053] The circulating ground chain is located in the dust removal chamber 6 and is equipped with a rotating device for rotating the workpiece fixture 2. The rotating device rotates the workpiece fixture 2 and drives the workpiece to rotate, and 360-degree dust removal is achieved through the electrostatic dust removal component 7.

[0054] The circulating ground chain includes a frame 11 and a closed-loop conveyor chain 12. The frame 11 is provided with a closed-loop chain track 13, and the conveyor chain 12 is installed in the chain track 13.

[0055] The rotating device includes the following structure: the conveyor chain 12 is connected to the support rod 1 via the pin 14, the bottom end of the support rod 1 is provided with a sleeve 15 sleeved on the top end of the pin 14, a bearing 16 is provided between the sleeve 15 and the pin 14, and a rotating sprocket 17 is coaxially fixed on the outside of the sleeve 15.

[0056] A drive motor 18 with a reducer is installed on the frame 11 within the dust removal chamber 6. A drive sprocket 19 is mounted on the upward-facing output shaft of the drive motor 18. A rotating driven sprocket 20 is located near the drive motor 18 on the frame 1. The drive sprocket 19 and the driven sprocket 20 are connected by a chain 21. A rotating sprocket 17 engages with the chain 21; when the chain 21 rotates, the rotating sprocket 17 rotates. Both the drive sprocket 19 and the driven sprocket 20 are double-row sprockets, and the chain 21 is a three-row chain. Figure 6 As shown, the double-row drive sprocket 19 and driven sprocket 20 cooperate with the upper and lower chains of the chain 21, and the middle chain cooperates with the rotating sprocket 17 to drive the motor 18 to rotate, which in turn drives the three-row chain to rotate, and in turn drives the rotating sprocket 17 to rotate.

[0057] As a preferred embodiment of this invention, such as Figure 1 As shown, the electrostatic dust removal assembly includes several ion nozzles 701, several electrostatic bars 702, and several energy-saving swing arms 703. The ion nozzles 701 are of the SIMICO model, the electrostatic bars 702 are of the SIMCO model, and the energy-saving swing arms 703 are of the Japanese GR pneumatic dust blower ga-rew model. The outlet of the ion nozzles 701 faces the workpiece fixture.

[0058] The ion nozzle 701 generates ion wind to peel off surface dust, achieving dust removal with a particle size of 0.3-100μm;

[0059] The electrostatic bar 702 generates a high-voltage electrostatic field to charge the dust, and the 10-50kV adjustable high-voltage electric field;

[0060] The energy-saving swing rod 703 can assist in cleaning the dead angle dust for complex geometric surfaces;

[0061] Through ion wind cleaning (ion wind nozzle 701), electrostatic adsorption (electrostatic bar 702), mechanical auxiliary cleaning (energy-saving swing rod 703), and negative pressure airflow organization (exhaust system), a composite dust removal mechanism is realized.

[0062] Through the triple action of "rotation + electrostatic adsorption + ion wind", dead angle cleaning is realized, and it is especially suitable for precision electronic components (such as chips and circuit boards).

[0063] In application, the dust removal efficiency for particles with a particle size of 0.3 microns or more is 99.5% or more, which is much higher than the 60-70% efficiency of traditional air guns.

[0064] As a preferred embodiment of the present embodiment, as shown in Figure 4 The dust removal chamber 6 is provided with a dust cover 22 on both sides of the conveying chain 12, and a soft rubber pad 23 is arranged between the dust covers 22 on both sides of the conveying chain 12 inside the dust removal chamber 6. The soft rubber pad 23 plays a role in plugging the gap between the two dust covers 22.

[0065] As a preferred embodiment of the present embodiment, as shown in Figure 1 The gas outlet 4 of the dust removal chamber 6 is arranged below the rack 11, the gas outlet 4 is provided with an exhaust passage 24 communicating with the dust removal chamber 6 on both sides of the dust cover 22, and the second filter 10 is arranged between the exhaust passage 24 and the exhaust fan 9.

[0066] As a preferred embodiment of the present embodiment, as shown in Figure 4 The mounting plate 101 is provided at the top of the support rod 1, the sleeve 102 is arranged at the bottom side of the mounting plate 101, the sleeve 102 is sleeved on the top of the support rod 1, and the fastening bolt 103 is arranged between the sleeve 102 and the support rod 1, the workpiece tooling 2 is arranged on the mounting plate 101, the sleeve 102, the mounting plate 101 and the workpiece tooling 2 are combined into a whole, and the fastening bolt 103 is used to quickly disassemble and assemble the workpiece tooling 2.

[0067] As a preferred embodiment of the present embodiment, the inlet and outlet positions of the dust removal box 6 are provided with lifting doors 25, the lifting doors 25 are provided with air cylinders 26 for controlling the up-down movement of the lifting doors 25, and in the dust removal process, the closed lifting doors 25 can assist in improving the sealing performance of the inner wall of the dust removal box 1.

[0068] As a preferred embodiment of the present embodiment, a feeding and discharging station is arranged on the circulating chain at the outlet position of the dust removal box 3, and a pretreatment dust removal device is arranged between the feeding and discharging station and the outlet of the dust removal box 3, the pretreatment dust removal device comprising a dust removal hood 27, the dust removal hood 27 being provided with an exhaust fan 9, and a third air filter 28 being arranged between the exhaust fan 9 and the dust removal hood 27, and a compressed air dust removal gun being arranged in the dust removal hood 27 for dust removal.

[0069] The working process of the electrical engineering and automation dust removal device can be divided into the following stages, and the system realizes full-automatic dust removal operation through the continuous operation of the circulating chain.

[0070] S1, the feeding stage: the workpiece is loaded to the workpiece tool 2 at the feeding and discharging station by manual or mechanical hand, and the compressed air dust removal gun of the pretreatment dust removal device is used for preliminary blowing at the pretreatment position, and the pretreatment dust removal device can be set according to the need.

[0071] During the operation of the circulating chain, the lifting doors 25 of the inlet and outlet of the dust removal box 3 are opened.

[0072] The workpiece enters the middle position of the dust removal box 3, the lifting doors 25 of the inlet and outlet of the dust removal box 3 are closed, and the circulating chain stops operating.

[0073] S2, rotating dust removal: the driving motor 18 is started, the driving sprocket 19 drives the chain 21 to rotate, the chain 21 drives the rotating sprocket 17 to rotate, then the workpiece tool 2 carries the workpiece to rotate, at this time the exhaust fan 9 at the bottom of the dust removal box 3 is started, the ion air nozzle 701, the electrostatic rod 702 and the energy-saving swing rod 703 are started to work, fresh air enters the dust removal box 3 through the first air filter 5, and flows downward under the action of the exhaust fan 9, and at the same time, the ion air nozzle 701, the electrostatic rod 702 and the energy-saving swing rod 703, and the rotating workpiece tool 2 are combined to perform 360° dust removal treatment on the surface of the workpiece.

[0074] The exhaust fan 9 continuously draws air to form a negative pressure environment, so that the airflow path in the dust removal box 3 is formed in sequence through the air inlet 4, the first filter 5, the dust removal cavity 6, the exhaust passage 24, the air outlet 8, the second filter 10 and the exhaust fan 9.

[0075] S3, the discharging stage: the dust removal in the dust removal box 3 is completed, the lifting doors 25 of the inlet and outlet of the dust removal box 3 are raised, the circulating chain is started, the workpiece after dust removal is moved to the feeding and discharging station for discharging, and then the system automatically circulates to process the next batch.

[0076] When dust removal is performed in the dust removal box 3, the combination of the closed lifting door 25, the protective cover 22 and the soft rubber pad 23 improves the airtightness of the dust removal cavity 6, and greatly reduces the interference of the external air environment.

[0077] The present application realizes the rotation of the workpiece by the meshing transmission of the chain 21 and the rotating sprocket 17, and the rotating speed can be adjusted by the speed reducer to realize the cleaning of the workpiece by 360 degrees.

[0078] Compared with the conventional air gun dust removal, the present application has the following table:

[0079] Comparison dimensions Traditional air gun dedusting Invention device Dedusting efficiency 60-70％ ≥99.5% (particles above 0.3 μm) Automation degree Full manual operation Full automatic assembly line Risk of secondary pollution Very high (open environment) Close to zero (closed negative pressure environment) Applicable workpiece complexity Only suitable for simple plane Support three-dimensional curved surface, micro-porous structure

[0080] The present application is suitable for the sterile production scene of precision electronic manufacturing (such as semiconductor packaging, optical lens), automotive electronic components, medical devices, etc.

[0081] The device of the present application solves the bottleneck of traditional dust removal technology in efficiency, environmental protection and adaptability through mechatronic design, and provides a mass production standardized solution for precision manufacturing industry.

[0082] The contents not described in detail in the present application are all prior art known to those skilled in the art, for example, the conveying chain operation technology of the circulating chain, the ion wind nozzle, the electrostatic bar, the energy-saving swing rod, the compressed air dust removal gun, etc. are all prior art.

[0083] Through the technical personnel in the art, all electrical components in the present application and their adapted power supply are connected by wires, and appropriate controllers should be selected according to the actual situation to meet the control requirements. The specific connection and control sequence should be completed according to the working order of each electrical component, and the detailed connection means is a known technology in the art, and the electrical control is not described.

[0084] The present application and its embodiments have been described above, which is not restrictive, and the embodiments shown in the drawings are only one of the embodiments of the present application, and the actual structure is not limited thereto. In general, if the ordinary skilled in the art is inspired, without departing from the purpose of the present application, without creative design, similar structure and embodiments of the technical scheme can be designed, which should belong to the protection scope of the present application.

Claims

1. An electrical engineering and automated dust removal device, characterized in that, include: A circulating ground chain is provided with several evenly distributed support rods. Each support rod has a workpiece fixture on top for placing the workpiece to be dusted. The circulating ground chain carries the workpiece fixture back and forth through the support rods. A dust removal station is set on the circulating ground chain. A dust collector is located at the dust collection station of the circulating ground chain. The top of the dust collector is equipped with an air inlet and a first filter. The dust collector has a dust collection chamber inside, and an electrostatic dust removal assembly is installed around the workpiece fixture inside the dust collection chamber. The bottom of the dust collection chamber is equipped with an air outlet, and an exhaust fan is installed at the air outlet to draw air out of the dust collection chamber. A second filter is installed between the inlet and outlet of the exhaust fan. The circulating ground chain is located in the dust removal chamber and is equipped with a rotating device for rotating the workpiece fixture. The rotating device rotates the workpiece fixture, causing the workpiece to rotate, and 360-degree dust removal is achieved through the electrostatic dust removal assembly.

2. The electrical engineering and automated dust removal device according to claim 1, characterized in that: The circulating ground chain includes a frame and a closed-loop conveyor chain, wherein the frame is provided with a closed-loop chain track and the conveyor chain is installed in the chain track; The conveyor chain is connected to the support rod via a pin. The bottom end of the support rod is provided with a sleeve fitted onto the top end of the pin. A bearing is provided between the sleeve and the pin. A rotating sprocket is coaxially fixed to the outside of the sleeve. The frame is equipped with a drive motor with a reducer, located inside the dust removal chamber. The output shaft of the drive motor is mounted with an upward-facing drive sprocket. A rotating passive sprocket is located on the frame near the drive motor. The drive sprocket and the passive sprocket are connected by a chain drive. The rotating sprocket can cooperate with the chain, and the chain rotates, driving the rotating sprocket to rotate.

3. The electrical engineering and automated dust removal device according to claim 1, characterized in that: The electrostatic dust removal assembly includes several ion nozzles, several electrostatic bars, and several energy-saving swing arms; the outlet of the ion nozzles faces the workpiece fixture.

4. The electrical engineering and automated dust removal device according to claim 2, characterized in that: The frame is equipped with protective covers on both sides of the conveyor chain. Inside the dust removal chamber, a soft rubber pad is placed between the protective covers on both sides of the conveyor chain. The soft rubber pad serves to seal the gap between the two protective covers.

5. An electrical engineering and automated dust removal device according to claim 4, characterized in that: The air outlet of the dust removal chamber is located below the frame. The air outlet is located on both sides of the dust cover and has an exhaust channel that communicates with the dust removal chamber. The second filter is located between the exhaust channel and the exhaust fan.

6. The electrical engineering and automated dust removal device according to claim 1, characterized in that: The support rod is provided with a mounting plate at the top, and a sleeve is provided on the bottom side of the mounting plate. The sleeve is fitted onto the top of the support rod and a fastening bolt is provided between the sleeve and the support rod. The workpiece fixture is mounted on the mounting plate.

7. An electrical engineering and automated dust removal device according to claim 1, characterized in that: The dust collector is equipped with lifting doors at both the inlet and outlet, and each lifting door is equipped with a cylinder to control its up and down movement.

8. An electrical engineering and automated dust removal device according to claim 1, characterized in that: A loading and unloading station is set on the circulating ground chain and at the outlet of the dust collection box. A pre-treatment dust removal device is also set on the circulating ground chain between the loading and unloading station and the outlet of the dust collection box. The pre-treatment dust removal device includes a dust removal hood, the dust removal hood is equipped with an exhaust fan, a third air filter is set between the exhaust fan and the dust removal hood, and a compressed air dust removal gun for dust removal is arranged inside the dust removal hood.

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