Water curtain type grinding table and working method thereof

Abstract

The invention discloses a water curtain type grinding table and a working method thereof, relates to the technical field of alloy casting grinding, and solves the problems of poor dust removal effect and low working efficiency of a grinding table in the prior art. Comprising a pedestal in which a water collecting tank is arranged; the polishing bin is arranged on the pedestal, and a machining area and a negative pressure air duct communicating with the machining area are formed on the two sides of the polishing bin; the machining stations are arranged in all the machining areas; the variable-frequency air draft device is arranged on the top surface of the polishing bin, communicates with the negative-pressure air duct and is used for providing negative-pressure suction force; the circulating pump group structure is used for supplying water to the equipment; the multi-stage water curtain device is arranged in the negative-pressure air duct, communicates with the circulating pump set structure and is used for carrying out multi-stage adsorption treatment on the dust-containing airflow; dust-containing airflow generated in the polishing process is captured and purified in a graded mode through a multi-stage water curtain structure, the dust removal efficiency is remarkably improved, the working environment is improved, and harm of dust to health of operators is reduced.

Description

Technical Field

[0001] This invention belongs to the field of alloy casting grinding technology, and particularly relates to a water curtain type grinding table and its working method. Background Technology

[0002] In the grinding and processing of alloy castings, the workpiece surface undergoes multiple processes such as grinding and polishing, which generates a large amount of fine dust. These dust particles are complex in composition, including metal microparticles, quartz sand, and carbon fibers. Long-term suspension in the air poses numerous hazards: firstly, it reduces visibility in the workshop, increasing the risk of fire and explosion; secondly, when dust concentrations exceed standards, long-term inhalation can easily lead to occupational diseases such as pneumoconiosis, seriously affecting workers' health. Furthermore, suspended dust can interfere with production safety. Of particular concern is that dust generated from the grinding of certain composite materials may contain heavy metal ions or organic pollutants, posing a significant potential hazard.

[0003] Currently, traditional polishing tables use single-stage water curtains or simple exhaust systems, but these systems have some drawbacks, such as low dust removal efficiency, uneven water curtain coverage, and unreasonable airflow organization. Some polishing tables also use exhaust systems combined with purification filters for dust removal. Although the dust removal effect is improved, it requires frequent maintenance, which not only increases the burden on workers but also reduces work efficiency.

[0004] In summary, existing grinding tables suffer from poor dust removal and low work efficiency. Summary of the Invention

[0005] This invention provides a water curtain type polishing table and its working method, which can solve the problems of poor dust removal effect and low working efficiency of existing polishing tables.

[0006] To achieve the above objectives, an embodiment of the first aspect of the present invention provides a water curtain type polishing table, including a base, the interior of which is provided with a water collection tank; A grinding chamber is provided on the pedestal, and processing areas and negative pressure air ducts communicating with the processing areas are formed on both sides of the grinding chamber. Processing stations are set up within each of the aforementioned processing areas; A variable frequency exhaust device is installed on the top surface of the grinding chamber and connected to the negative pressure air duct to provide negative pressure suction. A circulating pump set structure is used to supply water to the equipment; It also includes: a multi-stage water curtain device, which is installed in the negative pressure air duct and connected to the circulating pump group structure, for multi-stage adsorption treatment of dust-laden airflow; The multi-stage water curtain device includes a main water curtain structure, an auxiliary water curtain structure, and an atomizing spray structure arranged sequentially along the airflow direction.

[0007] As a further embodiment of the present invention, electric doors are provided on both sides of the grinding chamber at positions corresponding to each of the processing areas, and each electric door is provided with an observation window.

[0008] As a further embodiment of the present invention, the main water curtain structure includes a pair of V-shaped guide plates inclinedly disposed in each of the negative pressure air ducts, and a main water outlet fixed to the inner wall of the negative pressure air duct and located at the top of each guide plate for supplying water to the plate surface to form a main water outlet covering the entire plate surface. Each of the main water outlet components includes a main overflow tank and a main water injection tank connected to its lower side. Each of the main water injection tanks is connected to the circulating pump group structure, and each of the main overflow tanks is provided with a main overflow port.

[0009] As a further embodiment of the present invention, supports are fixedly installed on both sides of the inner wall of the negative pressure air duct, and both ends of each guide plate are rotatably disposed in the support via a rotating shaft. A fine-tuning cylinder is rotatably disposed on both sides of the inner wall of the negative pressure air duct below the support, and the rod end of the fine-tuning cylinder is rotatably connected to the bottom surface of each guide plate via a rotating shaft.

[0010] As a further embodiment of the present invention, the auxiliary water curtain structure includes a pair of mounting brackets fixedly disposed on the inner wall of each of the negative pressure air ducts, a W-shaped guide member fixedly connected in the mounting brackets, and a plurality of auxiliary water outlet members fixed on the guide members for supplying water to the plate surface to form a covering of the entire plate surface. Each lowest surface of each guide member is provided with a channel groove. Each of the auxiliary water outlet components includes an auxiliary overflow tank and an auxiliary water injection pipe connected to its lower side. Each auxiliary water injection pipe is connected to the circulating pump group structure, and each of the auxiliary overflow tanks is provided with an auxiliary overflow port.

[0011] As a further embodiment of the present invention, the atomizing spray structure includes spray discs symmetrically fixed on both sides of the inner wall of the negative pressure air duct and clean water pipes connected thereto, and each spray disc has a plurality of arrayed spray holes on its inner side.

[0012] As a further embodiment of the present invention, the variable frequency exhaust device includes a housing fixedly installed on the top surface of the grinding chamber, a negative pressure fan fixed inside the housing, and a frequency converter connected thereto. The input end of the negative pressure fan is provided with a negative pressure pipeline, which is divided into two sections and connected to each of the negative pressure air ducts respectively. The frequency converter is used to adjust the speed of the negative pressure fan to control the exhaust volume.

[0013] As a further embodiment of the present invention, the device also includes a dust monitoring module disposed in a negative pressure air duct; The signal output terminal of the dust monitoring module is connected to a controller. The controller is electrically connected to the frequency converter of the variable frequency exhaust device and the variable frequency water pump of the circulating pump group structure, respectively, so as to adjust the exhaust volume of the variable frequency exhaust device and the water supply volume of the circulating pump group structure according to the dust concentration signal detected by the dust monitoring module.

[0014] As a further embodiment of the present invention, the vertical distance between the main water curtain structure and the auxiliary water curtain structure is 300mm to 500mm, and the vertical distance between the auxiliary water curtain structure and the atomizing spray structure is 400mm to 600mm.

[0015] A method for operating a water curtain type polishing table includes the following steps: S1: Start the circulating pump unit to supply water to the main water curtain structure, auxiliary water curtain structure and atomizing spray structure; at the same time, start the variable frequency exhaust device to form negative pressure suction in the negative pressure air duct; S2: The dust-laden airflow passes through the main water curtain structure, the auxiliary water curtain structure and the atomizing spray structure in sequence for multi-stage adsorption treatment; S3: The purified gas is discharged by the frequency conversion exhaust device, and the dust flows into the water collection tank with the water flow to settle. In step S2, the flow distance of the dust-laden airflow between the main water curtain structure and the auxiliary water curtain structure is 300mm to 500mm, and the flow distance between the auxiliary water curtain structure and the atomizing spray structure is 400mm to 600mm.

[0016] Compared with the prior art, the beneficial effects of the present invention are: (1) This invention sequentially sets up a main water curtain structure, an auxiliary water curtain structure, and an atomizing spray structure in a negative pressure air duct, and is equipped with a variable frequency exhaust device and a dust monitoring module. This design can adjust the air volume and water flow in real time according to the grinding operation intensity, ensuring efficient dust removal while saving energy and reducing consumption. At the same time, electric doors and observation windows are set in the processing areas on both sides, which not only ensures operational safety, but also facilitates real-time observation of the processing status and improves operational convenience. In addition, this solution can also achieve graded collection and purification of dust-laden airflow, significantly improving the removal efficiency of dust with different particle sizes, especially the adsorption effect on fine dust is particularly outstanding; (2) The present invention adopts a V-shaped inclined arrangement of the guide plate and sets adjustable fine-tuning cylinders on both sides. This design can adjust the angle of the water curtain in real time according to different dust characteristics and wind speed, optimize the water curtain coverage effect and airflow contact efficiency, thereby enhancing the adaptability and flexibility of the equipment; (3) The auxiliary water curtain structure of the present invention adopts a W-shaped guide design and a channel groove is opened on each lowest surface. This design greatly increases the contact area and path between the water curtain and the airflow, forming a multi-layered, high-density water curtain barrier, which significantly improves the dust collection capacity; (4) In the present invention, an atomizing spray structure is also provided, which forms a uniform water mist through an array of spray holes on the spray plate. This structure performs final collection of the ultrafine dust remaining after passing through the first two stages of water curtain, ensuring that the emitted gas meets the cleanliness standard. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a cross-sectional front view of the structure of the present invention; Figure 3 This is a schematic diagram of the cross-sectional structure of the multi-stage water curtain device inside the negative pressure air duct of the present invention; Figure 4 This is a top view schematic diagram of the auxiliary water curtain structure of the present invention; Figure 5 This is a top view schematic diagram of the main water curtain structure of the present invention; Figure 6 This is a block diagram illustrating the module connections of the present invention.

[0018] Marked in the image: 1. Base; 11. Grinding chamber; 12. Electric door; 121. Observation window; 101. Machining area; 102. Negative pressure air duct; 103. Water collection tank; 104. Machining station; 2. Variable frequency exhaust device; 21. Protective cover; 22. Housing; 23. Negative pressure fan; 24. Variable frequency drive; 25. Negative pressure pipeline; 3. Circulating pump set structure; 4. Multi-stage water curtain device; 41. Main water curtain structure; 411. Guide plate; 412. Main water injection tank; 413. Main overflow tank; 414. Support; 415. Fine-tuning cylinder; 416. Main overflow port; 42. Auxiliary water curtain structure; 421. Mounting frame; 422. Guide component; 423. Channel groove; 424. Secondary overflow tank; 425. Secondary water injection pipe; 426. Secondary overflow port; 43. Atomizing spray structure; 431. Spray plate; 432. Clean water pipe; 433. Spray hole. Detailed Implementation

[0019] The specific embodiments of the present invention will be described in detail below, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0020] Example 1

[0021] like Figures 1 to 6 As shown, a water curtain type polishing table includes a base 1, which has a water collection tank 103 inside. A grinding chamber 11 is set on a base 1. Processing areas 101 and negative pressure air ducts 102 connected to the processing areas 101 are formed on both sides of the grinding chamber 11. It should be noted that electric doors 12 are set on both sides of the grinding chamber 11 at the position corresponding to each processing area 101. Each electric door 12 is provided with an observation window 121 for protection and observation of the processing situation. Processing station 104 is set within each processing area 101 for the placement and processing of workpieces; it should be noted that auxiliary workpiece placement and processing can be provided such as rotary tables and moving tables. The variable frequency exhaust device 2 is installed on the top surface of the grinding chamber 11 and is connected to each negative pressure air duct 102 to provide negative pressure suction for the negative pressure air duct 102. Specifically, the variable frequency exhaust device 2 includes a housing 22 fixedly installed on the top surface of the grinding chamber 11, a negative pressure fan 23 fixed inside the housing 22, and a frequency converter 24 connected thereto. The input end of the negative pressure fan 23 is provided with a negative pressure pipeline 25, which is divided into two sections and connected to each negative pressure air duct 102 respectively. The frequency converter 24 is used to adjust the speed of the negative pressure fan 23 to control the exhaust volume. By adjusting the speed of the negative pressure fan 23 through the frequency converter 24, the exhaust volume can be dynamically adjusted according to the intensity of the grinding operation, which can ensure effective dust collection and avoid unnecessary energy consumption, thus achieving a balance between energy saving and high efficiency. It should be noted that a protective cover 21 is fixedly installed on the top surface of the housing 22, and several exhaust slots are provided on the protective cover 21. The circulating pump set structure 3 is used to supply water to the equipment; it should be noted that the circulating pump set structure 3 includes a variable frequency water pump, electric valves and pipelines; A multi-stage water curtain device 4 is installed in the negative pressure air duct 102 and connected to the circulating pump group structure 3, and is used to perform multi-stage adsorption treatment of dust. The multi-stage water curtain device 4 includes a main water curtain structure 41, an auxiliary water curtain structure 42, and an atomizing spray structure 43 arranged sequentially from top to bottom along the airflow direction; The main water curtain structure 41 includes a pair of V-shaped guide plates 411 inclinedly arranged in each negative pressure air duct 102, and a main water outlet fixed to the inner wall of the negative pressure air duct 102 and located at the top of each guide plate 411 for supplying water to the plate surface to form a main water outlet covering the entire plate surface. Each main water outlet includes a main overflow tank 413 and a main water injection tank 412 connected to its lower side. Each main water injection tank 412 is connected to the circulating pump group structure 3. Each main overflow tank 413 is provided with a main overflow port 416, which is located on the surface of the guide plate 411. The auxiliary water curtain structure 42 includes a pair of mounting brackets 421 fixedly installed on the inner wall of each negative pressure air duct 102, a W-shaped guide member 422 fixedly connected in the mounting bracket 421, and several auxiliary water outlets fixed on the guide member 422 for supplying water to the plate surface to form a covering of the entire plate surface. Each lowest surface of each guide member 422 is provided with a channel groove 423. The W-shaped design greatly increases the contact area and path between the water curtain and the dust-laden airflow, while the channel groove 423 ensures the continuity and uniform distribution of the water flow, forming a multi-layered, high-density water curtain barrier, which significantly improves the dust adsorption effect. Each auxiliary water outlet includes an auxiliary overflow tank 424 and an auxiliary water injection pipe 425 connected to its lower side. Each auxiliary water injection pipe 425 is connected to the circulating pump group structure 3. Each auxiliary overflow tank 424 is provided with an auxiliary overflow port 426, and the auxiliary overflow port 426 corresponds to each inclined plate surface of the guide member 422. The atomizing spray structure 43 includes spray discs 431 symmetrically fixed on both sides of the inner wall of the negative pressure air duct 102, and clean water pipes 432 connected thereto. Each spray disc 431 is inclined, and each spray disc 431 has a number of arrayed spray holes 433 on its inner side.

[0022] Example 2

[0023] Based on Example 1, this example further provides a preferred scheme for adjusting the angle of the guide vane.

[0024] like Figure 2 As shown, supports 414 are fixedly installed on both inner walls of the negative pressure duct 102. Each guide plate 411 has its two ends rotatably mounted within the support 414 via a rotating shaft. Fine-tuning cylinders 415 are rotatably mounted on both inner walls of the negative pressure duct 102 below the supports 414. The rod end of the fine-tuning cylinder 415 is rotatably connected to the bottom surface of each guide plate 411 via a rotating shaft, used to adjust the angle of each guide plate 411. This design can optimize the coverage effect and collection efficiency of the water curtain according to different dust characteristics and wind speeds, enhancing the adaptability and flexibility of the equipment.

[0025] Example 3

[0026] Based on any one of Embodiments 1 to 2, this embodiment also includes a dust monitoring module 5 disposed in the negative pressure air duct 102; The signal output terminal of the dust monitoring module 5 is connected to a controller. The controller is electrically connected to the frequency converter 24 of the frequency conversion exhaust device 2 and the frequency conversion water pump of the circulating pump group structure 3, respectively, so as to adjust the exhaust volume of the frequency conversion exhaust device 2 and the water supply of the circulating pump group structure 3 according to the dust concentration signal detected by the dust monitoring module, so as to ensure that the equipment is always in the best working state. This control part is implemented according to the publicly available prior art, and will not be described in detail in this embodiment.

[0027] In this embodiment, it should also be noted that the actual dimensions of each component in the application document are selected and installed according to the actual needs on site. Additionally, it should be noted that this application document only addresses the shortcomings of existing grinding tables, such as poor dust removal and low work efficiency, and does not involve improvements in other aspects.

[0028] To facilitate understanding of the embodiments of this solution by those skilled in the art, the working principle of this solution will now be briefly explained in conjunction with specific application scenarios: The working principle of a water curtain type polishing table includes the following steps: Step 1: Start-up and water / air supply; Start the circulating pump group structure to supply water to the main water curtain structure 41, the auxiliary water curtain structure 42 and the atomizing spray structure 43; at the same time, start the variable frequency exhaust device 2, and form a negative pressure suction in the negative pressure air duct 102 through the negative pressure fan 23, so that the dust-laden airflow in the processing area 101 flows towards the negative pressure air duct 102. Step 2: Multi-stage water curtain adsorption treatment; The dust-laden airflow first enters the main water curtain structure 41 area, where water flows evenly down from the main overflow troughs 413 on both sides and forms a main water curtain covering the surface along the V-shaped guide plate 411, which initially captures coarse dust particles in the airflow. Then, the airflow enters the auxiliary water curtain structure 42 area, where it forms a multi-layer water curtain through the W-shaped guide member 422, which further adsorbs fine dust particles. Finally, the airflow passes through the atomizing spray structure 43 area, where the uniform water mist generated by the spray plate 431 finally captures and purifies the ultrafine dust particles. Step 3: Airflow discharge and dust settling; The clean gas, purified by multi-stage water curtains, is discharged outside the equipment by negative pressure fan 23; the collected dust flows with the water into the water collection tank 103 inside the platform 1 for sedimentation treatment. At the same time, the dust monitoring module monitors the dust concentration in the processing area 101 in real time and feeds the signal back to the frequency converter 24 and the circulating pump group structure 3, automatically adjusting the exhaust volume and water flow to ensure that the equipment is always in the best working condition to complete the entire processing process.

[0029] Example 4

[0030] Based on Examples 1 to 3, this example further studies the vertical spacing between the main water curtain structure 41, the auxiliary water curtain structure 42 and the atomizing spray structure 43 in the multi-stage water curtain device 4 in order to determine the optimal spacing range and achieve the optimal graded collection effect for dust of different particle sizes. The following spacing parameters are defined along the airflow direction (i.e., the vertical direction): D1: The vertical distance between the lower end of the outlet of the main water curtain structure 41 and the upper end of the inlet of the auxiliary water curtain structure 42. D2: The vertical distance between the lower end of the water outlet of the auxiliary water curtain structure 42 and the center of the spray plate of the atomizing spray structure 43; It should be noted that the "flow distance" in this application refers to the distance between two adjacent water curtain devices as the dust-laden airflow flows along the airflow direction in the negative pressure duct. Specifically, the flow distance between the main water curtain structure 41 and the auxiliary water curtain structure 42 is the vertical distance D1 between them; the flow distance between the auxiliary water curtain structure 42 and the atomizing spray structure 43 is the vertical distance D2 between them.

[0031] To verify the effect of different spacing combinations on dust removal performance, a comparative experiment was conducted on 8 different D1 and D2 combinations under the same operating conditions. The experimental conditions are shown in the table below:

[0032] The testing standard is in accordance with GB / T 15187-2005 "Test Method for Performance of Wet Dust Collectors".

[0033] Table 1. Effects of different vertical spacing combinations on dust removal performance

[0034] Note: The relative energy consumption is based on the total power consumption of group B1 (100%), and is the percentage of the total power consumption of other groups compared to it.

[0035] To further analyze the graded collection effect of water curtains at each level within the optimized spacing range on dust particles of different sizes, graded concentration tests were conducted on groups B4, B5, and B6. The results are shown in Table 2 below:

[0036] Table 2. Classification and collection effects of dust particles of different sizes under different combinations of vertical spacing.

[0037] The following conclusions can be drawn from the data in Tables 1 and 2 above: (1) The effect of too small spacing (groups B1-B2) When D1 < 300mm and D2 < 400mm, the distance between the water curtains at each level is too close. The water mist generated by the main water curtain interferes with the auxiliary water curtain, resulting in discontinuous water curtain formation and localized splashing. Simultaneously, there is insufficient space for airflow redistribution between levels, causing some dust to be carried to the next level without effectively contacting the water curtain, resulting in an overall dust removal efficiency of less than 96%, especially for PM2.5 ultrafine dust, which is less than 88%.

[0038] (2) The impact of excessive spacing (Groups B7-B8)

[0039] When D1 > 500mm and D2 > 600mm, although the water curtains at each level form well and do not interfere with each other, the total height of the negative pressure duct increases significantly, leading to increased airflow resistance loss and a system pressure drop exceeding 385Pa. Energy consumption increases by 25%-38% compared to group B1. At the same time, the overall height of the equipment is too large, occupying more factory space and hindering compact equipment design.

[0040] (3) Optimal spacing range (groups B4-B6)

[0041] When D1 = 350-450mm and D2 = 450-550mm, the dust removal effect and energy consumption reach the optimal balance point: a. The overall dust removal efficiency remains stable at 97.2%-98.1% or higher; b. PM2.5 ultrafine dust collection efficiency can reach 94.7%~96.9%; c. The system pressure drop is controlled between 322-355Pa, and the increase in energy consumption is controlled within an acceptable range (8%-18%). d. The water curtain is formed continuously and uniformly, with no mutual interference between different levels; (4) Optimal combination (Group B5) Specifically, when D1=400mm and D2=500mm (i.e., group B5), all indicators reach their optimal levels (see Table 2): The overall dust removal efficiency is as high as 98.1%; The PM2.5 ultrafine dust collection efficiency reaches 96.9%; The system has a pressure drop of 335 Pa and moderate energy consumption.

[0042] To further verify the adaptability of the optimized spacing, tests were conducted on group B5 (D1=400mm, D2=500mm) under different working conditions, as shown in Table 3 below.

[0043] Table 3. Dust removal effect of group B5 under different operating conditions

[0044] The results show that, within a wide range of operating conditions (wind speed 6-14 m / s, inlet concentration 150-600 mg / m³), the spacing settings of group B5 can maintain a dust removal efficiency of over 97.7%, demonstrating good adaptability to operating conditions.

[0045] In summary, the effects achieved by this embodiment are as follows: (1) The optimal vertical spacing range of the multi-stage water curtain device was determined through system experiments to be D1=350-450mm and D2=450-550mm, with D1=400mm and D2=500mm being preferred; (2) At the optimal spacing, each level of water curtain can independently form a stable water film and achieve a synergistic effect of graded collection, with a removal efficiency of over 96% for coarse, fine and ultrafine dust. (3) It avoids the problems of interstage interference caused by too small spacing and equipment bulkiness and increased energy consumption caused by too large spacing, and achieves the unity of efficient dust removal and compact equipment; (4) The adaptability of the preferred spacing under different working conditions was verified, providing a reliable guarantee for the actual application of the equipment.

[0046] The above-disclosed embodiments are only a few specific examples of the present invention. However, the embodiments of the present invention are not limited thereto, and any variations that can be conceived by those skilled in the art should fall within the protection scope of the present invention.

Claims

1. A water curtain type polishing table, characterized in that, Includes a base (1), which has a water collection tank (103) inside. A grinding chamber (11) is provided on the pedestal (1). A processing area (101) and a negative pressure air duct (102) connected to the processing area (101) are formed on both sides of the grinding chamber (11). A processing station (104) is provided within each of the processing areas (101); A variable frequency exhaust device (2) is installed on the top surface of the grinding chamber (11) and connected to the negative pressure air duct (102) to provide negative pressure suction. The circulating pump set structure (3) is used to supply water to the equipment; The feature is that it further includes: a multi-stage water curtain device (4), which is installed in the negative pressure air duct (102) and connected to the circulating pump group structure (3) for multi-stage adsorption treatment of dust-laden airflow; The multi-stage water curtain device (4) includes a main water curtain structure (41), an auxiliary water curtain structure (42), and an atomizing spray structure (43) arranged sequentially along the airflow direction.

2. The water curtain type polishing table according to claim 1, characterized in that, Electric doors (12) are provided on both sides of the grinding chamber (11) at positions corresponding to each of the processing areas (101), and each electric door (12) is provided with an observation window (121).

3. A water curtain type polishing table according to claim 1, characterized in that, The main water curtain structure (41) includes a pair of V-shaped guide plates (411) inclinedly arranged in each negative pressure air duct (102), and a main water outlet fixed to the inner wall of the negative pressure air duct (102) and located at the top of each guide plate (411) for supplying water to the plate surface to form a main water outlet covering the entire plate surface; Each of the main water outlet components includes a main overflow tank (413) and a main water injection tank (412) connected to its lower side. Each of the main water injection tanks (412) is connected to the circulating pump group structure (3). Each of the main overflow tanks (413) is provided with a main overflow port (416).

4. A water curtain type polishing table according to claim 3, characterized in that, Both sides of the negative pressure air duct (102) are fixedly installed with supports (414). Both ends of each guide plate (411) are rotatably set in the support (414) through a rotating shaft. Both sides of the negative pressure air duct (102) are rotatably set with fine adjustment cylinders (415) located below the support (414). The rod end of the fine adjustment cylinder (415) is rotatably connected to the bottom surface of each guide plate (411) through a rotating shaft.

5. A water curtain type polishing table according to claim 1, characterized in that, The auxiliary water curtain structure (42) includes a pair of mounting brackets (421) fixedly installed on the inner wall of each negative pressure air duct (102), a W-shaped guide member (422) fixedly connected in the mounting bracket (421), and a number of auxiliary water outlets fixed on the guide member (422) for supplying water to the plate surface to form a covering of the entire plate surface. Each lowest surface of each guide member (422) is provided with a channel groove (423). Each of the auxiliary water outlets includes an auxiliary overflow tank (424) and an auxiliary water injection pipe (425) connected to the lower end of its side. Each of the auxiliary water injection pipes (425) is connected to the circulating pump group structure (3). Each of the auxiliary overflow tanks (424) is provided with an auxiliary overflow port (426).

6. A water curtain type polishing table according to claim 1, characterized in that, The atomizing spray structure (43) includes spray discs (431) symmetrically fixed on both sides of the inner wall of the negative pressure air duct (102) and clean water pipes (432) connected thereto. Each spray disc (431) has a number of arrayed spray holes (433) on its inner side.

7. A water curtain type polishing table according to claim 1, characterized in that, The variable frequency exhaust device (2) includes a housing (22) fixedly installed on the top surface of the grinding chamber (11), a negative pressure fan (23) fixed inside the housing (22), and a frequency converter (24) connected thereto. The input end of the negative pressure fan (23) is provided with a negative pressure pipeline (25). The negative pressure pipeline (25) is divided into two sections, which are respectively connected to each of the negative pressure air ducts (102). The frequency converter (24) is used to adjust the speed of the negative pressure fan (23) to control the exhaust volume.

8. A water curtain type polishing table according to claim 1, characterized in that, It also includes a dust monitoring module (5) installed in the negative pressure air duct (102); The signal output terminal of the dust monitoring module is connected to a controller. The controller is electrically connected to the frequency converter (24) of the frequency conversion exhaust device (2) and the frequency conversion water pump of the circulating pump group structure (3) respectively, so as to adjust the exhaust volume of the frequency conversion exhaust device (2) and the water supply of the circulating pump group structure (3) according to the dust concentration signal detected by the dust monitoring module.

9. A water curtain type polishing table according to claim 1, characterized in that, The vertical distance between the main water curtain structure (41) and the auxiliary water curtain structure (42) is 300mm to 500mm, and the vertical distance between the auxiliary water curtain structure (42) and the atomizing spray structure (43) is 400mm to 600mm.

10. A method for operating a water curtain type polishing table, applied to the water curtain type polishing table as described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Start the circulating pump group structure (3) to supply water to the main water curtain structure (41), the auxiliary water curtain structure (42) and the atomizing spray structure (43); at the same time, start the variable frequency exhaust device (2) to form negative pressure suction in the negative pressure air duct (102); S2: The dust-laden airflow passes through the main water curtain structure (41), the auxiliary water curtain structure (42), and the atomizing spray structure (43) in sequence for multi-stage adsorption treatment; S3: The purified gas is discharged by the variable frequency exhaust device (2), and the dust flows into the water collection tank (103) with the water flow to settle; In step S2, the flow distance between the dust-laden airflow and the main water curtain structure (41) and the auxiliary water curtain structure (42) is 300mm to 500mm, and the flow distance between the auxiliary water curtain structure (42) and the atomizing spray structure (43) is 400mm to 600mm.

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