Negative pressure dust collection polishing head

Abstract

The invention relates to the technical field of polishing heads, in particular to a negative pressure dust collection polishing head which comprises an outer shell. The rotating disc is arranged in the outer shell and rotates around the axis direction of the rotating disc; the dust suction part is arranged at the bottom of the outer shell, the connecting line between a dust suction opening of the dust suction part and the axis of the rotary disc is perpendicular to the horizontal plane where the axis of the rotary disc is located, and the dust suction direction of the dust suction opening is perpendicular to the side face of the polishing side of the rotary disc. According to the vertical dust collection layout, the dust collection opening can directly face a core area where dust is generated and drifts away, the efficiency of capturing the dust through negative pressure is greatly improved, and drifting and escaping of the dust are reduced; the vertical dust collection direction is matched with the natural falling track of dust, the dust can enter a dust collection pipeline more quickly through the synergistic effect of gravity and negative pressure, and adhesion and accumulation caused by long-time floating of the dust in the grinding head are avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of polishing heads, and particularly relates to a negative pressure dust collection polishing head. BACKGROUND

[0002] In the polishing work scene of building decoration, furniture manufacturing and the like, the negative pressure dust collection polishing head becomes the core equipment for improving the work environment quality and protecting the health of operators due to its dust collection function. The core working principle is that the sandpaper is driven to polish the surface to be processed through high-speed rotation of the rotating disc, and the dust generated in the polishing is sucked into the pipeline and discharged through the negative pressure generated by the dust collection member. However, the existing negative pressure dust collection polishing head still has many technical defects in actual application, which seriously affects the dust removal effect and the stability of the equipment. In the prior art, the dust collection direction of the dust collection member is inclined to the polishing side of the rotating disc, so that the dust capturing force of the dust collection port is insufficient, and part of the dust is easy to float into the polishing head instead of being directly sucked into the pipeline. SUMMARY

[0003] Some simplification or omission may be made in this part and the abstract and title of the specification of the present application to avoid obscuring the purpose of this part, the abstract and the title, and such simplification or omission cannot be used to limit the scope of the present application.

[0004] In order to solve the problem of insufficient dust capturing force of the prior art, the purpose of the present application is to provide a negative pressure dust collection polishing head, comprising an outer shell, a rotating disc arranged in the outer shell, the rotating disc rotates around its own central axis, a dust collection member arranged at the bottom of the outer shell, and the vertical line formed between the dust collection direction of the dust collection port of the dust collection member and the central axis of the rotating disc is perpendicular to the horizontal plane where the central axis of the rotating disc is located, and the dust collection direction of the dust collection port is perpendicular to the side surface of the polishing side of the rotating disc.

[0005] As a preferred scheme of the negative pressure dust collection polishing head of the present application, further comprising an inner fixed shell fixedly installed in the outer shell, the central axis of the inner fixed shell is coaxially arranged with the central axis of the outer shell, a rotating disc support arranged in the outer shell, the outer diameter of the rotating disc support is smaller than the inner diameter of the inner fixed shell, and the rotating disc support rotates around its own central axis.

[0006] As a preferred scheme of the negative pressure dust collection polishing head of the present application, further comprising a scraping member arranged on the inner fixed shell, the scraping member abuts against the outer peripheral surface of the rotating disc support, and the scraping member is used for scraping dust on the rotating disc support.

[0007] As a preferred scheme of the negative pressure dust collection polishing head, the scraping member comprises n dust scraping plates and m mounting plates, n and m are positive integers greater than or equal to 1, the n dust scraping plates and the m mounting plates are arranged one by one, the dust scraping plates are arranged on the mounting plates, the mounting plates are arranged on the inner fixed shell, and the n dust scraping plates are arranged along the extension direction of the outer circumferential surface of the rotating disc support.

[0008] As a preferred scheme of the negative pressure dust collection polishing head, the rotating disc rotates clockwise, and the dust scraping plate is located in the fourth quadrant of the projection of the side of the rotating disc away from the polishing side; and the first included angle between the length direction of the dust scraping plate and the horizontal center surface of the rotating disc support is 15-20°.

[0009] As a preferred scheme of the negative pressure dust collection polishing head, the vertical cross-sectional area of the inner fixed shell gradually decreases from the position away from the rotating disc to the position close to the rotating disc, the vertical cross-sectional surface of the inner fixed shell is perpendicular to the central axis of the inner fixed shell, and the outer circumferential surface of the inner fixed shell is used to guide the dust to slide downward.

[0010] As a preferred scheme of the negative pressure dust collection polishing head, the vertical cross-sectional area of the rotating disc support gradually decreases from the position away from the rotating disc to the position close to the rotating disc, the vertical cross-sectional surface of the rotating disc support is perpendicular to the central axis of the rotating disc support, the circumferential side surface of the inner fixed shell is arranged in parallel with the circumferential side surface of the rotating disc support, and the second included angle between the circumferential side surface of the inner fixed shell and the axis of the rotating disc support is 15-30°.

[0011] As a preferred scheme of the negative pressure dust collection polishing head, a connecting cavity is formed between the inner fixed shell and the rotating disc support, and the inner fixed shell and the rotating disc support are clearance fit; a dust blocking member is arranged in the connecting cavity, the dust blocking member is used to block the gap between the inner fixed shell and the rotating disc support, and adjacent two dust blocking members divide the connecting cavity into sub-chambers.

[0012] As a preferred scheme of the negative pressure dust collection polishing head, the dust blocking member is provided with p dust blocking members, and the p dust blocking members divide the connecting cavity into a plurality of sub-chambers.

[0013] As a preferred scheme of the negative pressure dust collection polishing head, the dust falling holes are arranged on the circumferential wall of the inner fixed shell, the dust falling holes are used for guiding the dust in the sub-chamber to fall out of the sub-chamber, the dust falling holes are also provided with q, q is a positive integer greater than or equal to 1, and the q dust falling holes are arranged in one-to-one correspondence with the m sub-chambers; the dust falling holes are located on the negative Y-axis of the projection of the one side of the turntable support on the back side of the turntable, and the falling direction of the dust in the dust falling holes is perpendicular to the dust collection direction of the dust collection port.

[0014] The application has the following beneficial effects: the dust collection part is arranged at the bottom of the outer shell, the line between the dust collection port and the axis of the turntable is perpendicular to the horizontal plane where the axis of the turntable is located, and the dust collection direction is perpendicular to the side of the polishing side of the turntable, so that the vertical dust collection layout enables the dust collection port to face the core area where the dust is generated and dispersed, greatly improves the dust collection efficiency of the negative pressure, and reduces the dust dispersion and escape; the vertical dust collection direction is consistent with the natural falling track of the dust, the gravity and the negative pressure are used in cooperation to make the dust enter the dust collection pipeline more quickly, and the adhesion and accumulation caused by the long-time floating of the dust in the polishing head are avoided. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can also be obtained by those skilled in the art without creative effort on the basis of these drawings.

[0016] Figure 1 It is a sectional view of the negative pressure dust collection polishing head.

[0017] Figure 2 It is a mounting schematic view of the inner fixed shell of the negative pressure dust collection polishing head.

[0018] Figure 3 It is a view of the polishing side of the negative pressure dust collection polishing head.

[0019] Figure 4 It is a view of the polishing side of the negative pressure dust collection polishing head. Figure 3 It is a sectional view of B-B.

[0020] Figure 5 It is a position schematic view of the scraping part of the negative pressure dust collection polishing head. Figure 1

[0021] Figure 6 It is a position schematic view of the scraping part of the negative pressure dust collection polishing head. Figure 2

[0022] Figure 7 ​​The second angle position diagram of the negative pressure dust collection polishing head of the present application.

[0023] Figure 8 For Figure 1 The enlarged view of the A area.

[0024] Figure 9 The dust hole position diagram of the negative pressure dust collection polishing head of the present application.

[0025] In the figure: 100, outer shell; 200, rotating disc; 300, dust collection part; 301, dust collection port; 400, inner fixed shell; 500, rotating disc support; 501, horizontal center surface; 502, first angle; 503, second angle; rotating disc support; 600, scraping part; 601, dust scraping plate; 602, mounting plate; 700, connecting cavity; 701, sub-chamber; 702, dust hole; 800, dust blocking part; L, annular spacing. DETAILED DESCRIPTION

[0026] In order to make the purpose, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application will be described in detail below in combination with the drawings of the specification.

[0027] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the concept of the present application, therefore the present application is not limited to the specific embodiments disclosed below.

[0028] Secondly, the "one embodiment" or "embodiment" referred to herein means that the specific features, structures or characteristics can be included in at least one implementation of the present application. "In one embodiment" appearing in different places in the specification does not mean the same embodiment, nor is it an embodiment that is separate or alternative to other embodiments.

[0029] Embodiment 1, see Figure 1 For the first embodiment of the present application, the embodiment provides a negative pressure dust collection polishing head.

[0030] Specifically, the negative pressure dust collection polishing head comprises an outer shell 100, a rotating disc 200 and a dust collection part 300. The outer shell 100 is a hollow cylindrical structure, made of engineering plastic or metal material, with lightweight characteristics and structural stability, providing installation support and protection for the internal structure. The rotating disc 200 is arranged inside the outer shell 100, with the center shaft coaxially arranged with the center shaft of the outer shell 100, one side of the rotating disc 200 being the polishing side for pasting three polishing sandpapers, the three polishing sandpapers being evenly arranged along the circumferential direction of the rotating disc 200, the other side being the side opposite to the polishing side, the rotating disc 200 being rotatable around its own central axis direction to realize polishing work.

[0031] Preferably, the dust suction member 300 comprises a negative pressure suction motor fixedly installed at the bottom of the outer shell 100, and the dust suction port 301 of the dust suction member 300 faces the lower area of the rotating disc 200. A brush is arranged on the outer shell 100 facing the wall surface, so that a negative pressure area is formed between the outer shell 100 and the wall surface.

[0032] The line connecting the dust suction port 301 and the axis of the rotating disc 200 is perpendicular to the horizontal plane where the axis of the rotating disc 200 is located; at the same time, the dust suction direction of the dust suction port 301 is perpendicular to the side surface of the polishing side of the rotating disc 200, forming a directly opposite dust suction layout.

[0033] During operation, the dust generated by the rotation of the rotating disc 200 settles downward under the action of gravity, and the vertical negative pressure generated by the dust suction member 300 directly acts on the dust settling path, quickly sucking the dust into the dust suction port 301, thereby realizing the capture of the dust.

[0034] Embodiment 2, see Figures 1-7 As a second embodiment of the present application, the structural details of the negative pressure dust suction polishing head are described one by one.

[0035] Specifically, the negative pressure dust suction polishing head further comprises an inner fixed shell 400 and a rotating disc support 500. The inner fixed shell 400 is a ring-shaped cylindrical structure made of aluminum alloy, which is fixedly installed inside the outer shell 100 by screws, and is coaxially arranged with the outer shell 100 to ensure installation accuracy. The rotating disc support 500 is also a ring-shaped structure, and its outer diameter is smaller than the inner diameter of the inner fixed shell 400, and the two are coaxially nested, and the rotating disc support 500 can rotate around its own axis and synchronously rotate with the rotating disc 200. The negative pressure dust suction polishing head of the present embodiment is provided with a driving motor, the rotating shaft of the driving motor is provided with the rotating disc support 500, and the end of the rotating shaft of the driving motor facing the wall surface is provided with the rotating disc 200, so as to realize the synchronous rotation of the rotating disc support 500 and the rotating disc 200. The inner fixed shell 400 provides an installation reference and protection for the rotating disc support 500, and the annular space L formed between the inner fixed shell 400 and the rotating disc support 500 provides an installation space for the subsequent dust guiding and scraping structure, and at the same time, through the nested layout, the internal structure layout of the polishing head is optimized, and the overall sealing performance is improved.

[0036] Preferably, the polishing head further comprises a scraping member 600, which is arranged on the inner fixed shell 400. When the rotating disc 200 rotates clockwise, part of the dust is easily thrown and attached to the outer peripheral surface of the rotating disc support 500. The working end of the scraping member 600 abuts against the outer peripheral surface of the rotating disc support 500. The scraping member 600 can actively scrape the dust attached to the outer peripheral surface of the rotating disc support 500, so as to avoid the secondary invasion of the dust after the dust accumulates and falls off.

[0037] Preferably, the scraping member 600 comprises n dust scraping plates 601 and m mounting plates 602, n and m are positive integers greater than or equal to 1, the n dust scraping plates 601 and the m mounting plates 602 are arranged one by one, the dust scraping plate 601 is arranged on the mounting plate 602, and the mounting plate 602 is arranged on the inner circumferential surface of the inner fixed shell 400. In the embodiment, n is preferably 3, and the three dust scraping plates 601 are uniformly arranged along the axial direction of the rotating disc support 500. The distance between adjacent dust scraping plates 601 is 10-15 mm. The plurality of dust scraping plates 601 are arranged along the extension direction of the outer circumferential surface of the rotating disc support 500, forming a plurality of scraping areas, which can cover different areas of the outer circumferential surface of the rotating disc support 500 in a larger range, improve the coverage of dust scraping, and avoid dead angles.

[0038] Preferably, the first included angle 502 between the length direction extension line of the dust scraping plate 601 and the horizontal center surface 501 of the rotating disc support 500 is 15-20°, and the embodiment is preferably 18°. The dust scraping plate 601 is installed along the rotation direction of the rotating disc 200, which can reduce the friction resistance between the dust scraping plate 601 and the rotating disc 200, reduce wear, and prolong the service life. The rotating disc 200 of the embodiment rotates clockwise. The reference visual angle of the clockwise rotation is the visual angle of the person looking at the wall surface, and the projection of the dust scraping plate 601 on the side of the rotating disc 200 away from the polishing side is in the fourth quadrant. Because the rotating disc 200 rotates clockwise, most of the accumulated dust is accumulated at the rotation end of one cycle of the rotating disc 200, that is, the installation position of the fourth quadrant corresponds to the area where dust is easy to adhere. It is ensured that the dust scraping plate 601 can efficiently contact and scrape the dust, and the scraping pertinence is improved.

[0039] The experimental conditions of Table 1 below: experimental samples, 5 groups of dust scraping plates 601 with the same structure were made, the aluminum plate was 2.5 mm thick, the installation angles were 15°, 16°, 18°, 19° and 20° respectively, and the remaining parameters were completely consistent, such as the distance of 0.1 mm between the dust scraping plate 601 and the rotating disc support 500, and the installation position was in the fourth quadrant. Dust parameters: common calcium carbonate dust for building wall polishing was used, the particle size distribution was 0.1-100 μm, the average particle size was 50 μm, the dust density was 1.2 g / cm³, and the actual polishing dust characteristics were simulated. Equipment and environment: the driving motor controls the rotating disc 200 to rotate at a speed of 1500 r / min; the electronic balance with an accuracy of 0.001 g is used to weigh the scraped dust and the wear amount; the torque sensor with an accuracy of 0.01 N·m is used to measure the dust scraping resistance between the dust scraping plate 601 and the rotating disc 200; the experimental environment is at room temperature of 25°C and humidity of 50%, without air flow interference, to ensure data repeatability.

[0040] Experimental procedure: after each group of samples was installed, the driving motor was started, and dust was continuously delivered to the back of the turntable 200 opposite the polishing side by the dust generator at a rate of 1 g / min, and the experiment was run continuously for 60 minutes; after the experiment was completed, three core indicators were measured: dust scraping efficiency, wear amount, and dust scraping resistance, each group of experiments was repeated three times, and the average value was taken as the final data.

[0041] Table 1:

[0042] The data in Table 1 shows that: Dust scraping efficiency = (total amount of scraped dust / total amount of delivered dust) x 100%, the higher the value, the better the dust scraping effect; Wear amount = mass of scraping plate 601 before experiment - mass of scraping plate 601 after experiment, the lower the value, the longer the service life of the scraping plate 601; Dust scraping resistance = friction resistance between the scraping plate 601 and the turntable support 500 measured by the torque sensor, the lower the value, the smaller the load on the driving of the turntable support 500, avoiding excessive energy consumption of the polishing head; Data verification and analysis in Table 1: Dust scraping efficiency: the first angle 502 is 18°, which reaches the peak value, and the dust removal effect is optimal; the specific performance data and analysis corresponding to different first angles 502 are as follows:

[0043] First angle 502 is 15°: scraping efficiency is only 88.6%, because the first angle 502 is too small, the contact area of the scraping plate 601 with the surface of the turntable support 500 is insufficient, covering only 65% of the surface of the turntable support 500, part of the dust leaks and is not effectively scraped; at the same time, the small inclination angle leads to insufficient scraping force of the scraping plate 601 on the dust, and the fine component dust still adheres to the surface of the turntable support 500.

[0044] First angle 502 is 16°: efficiency increases to 91.3%, the increase of the first angle 502 increases the contact area of the scraping plate 601 to 78%, the scraping force is enhanced, and the amount of missed scraping dust is reduced, but a small amount of dust still remains on the edge of the turntable support 500 due to the poor fit of the cutting angle.

[0045] First angle 502 is 18°: efficiency reaches a peak of 96.8%, at this time the contact area of the scraping plate 601 with the surface of the turntable support 500 is 92%, and the inclination angle is completely adapted to the rotation direction of the turntable support 500, the scraping plate 601 is in a forward cutting state, which can fully cover the surface of the turntable support 500 and produce the best scraping force on the adhered dust, and the amount of residual dust on the surface of the turntable support 500 after the experiment is only 0.032 g, which is much lower than that of other groups.

[0046] The first included angle 502 is 19°: the efficiency decreases slightly to 95.2%, and the first included angle 502 is too large, causing the contact mode of the dust scraping plate 601 and the rotating disc support 500 to change from surface contact to local contact, the contact area decreases to 85%, and a scraping blind area appears in some areas, a small amount of dust accumulates in the blind area and cannot be scraped off.

[0047] The first included angle 502 is 20°: the efficiency further decreases to 92.5%, and the first included angle 502 is too large, causing the front end of the dust scraping plate 601 to be excessively bent and appear to be down, which cannot effectively adhere to the surface of the rotating disc support 500, and the amount of missed scraping dust increases significantly, and the scraping effect decreases significantly.

[0048] The wear amount of the dust scraping plate 601: when the first included angle 502 is 18°, the wear amount is the smallest, and the component life is the longest; The first included angle 502 is 15° / 20°: the wear amount is 3.2 mg and 3.0 mg respectively, both of which are at a relatively high level. When the first included angle 502 is 15°, the contact area between the dust scraping plate 601 and the rotating disc support 500 is small, the local pressure is too large, the pressure is 1.2 MPa, and the dust scraping plate 601 is easy to be pressed off; when the first included angle 502 is 20°, the down phenomenon causes the connection between the root of the dust scraping plate 601 and the mounting plate 602 to concentrate stress, which is easy to damage, resulting in increased wear.

[0049] The first included angle 502 is 16° / 19°: the wear amount decreases to 2.8 mg and 2.5 mg, and the optimization of the first included angle 502 makes the contact pressure of the dust scraping plate 601 uniform, which is 0.8-0.9 MPa, and the stress state of the dust scraping plate 601 is improved, but the wear amount is still higher than the optimal value due to slight defects in the contact area or adhesion mode.

[0050] The first included angle 502 is 18°: the wear amount is only 2.1 mg, at this time the dust scraping plate 601 and the rotating disc support 500 are in uniform surface contact, the contact pressure is stable at 0.7 MPa, the pressure threshold of the dust scraping plate 601 is 1.5 MPa, the dust scraping plate 601 is neither excessively extruded nor down, only normal friction loss occurs, and the length of the dust scraping plate 601 remains 5.8 mm after the experiment, almost no obvious shortening, and the component life can be extended to 1.5 times of the conventional angle.

[0051] The first included angle 502 is 18°: the resistance is the smallest, and the energy consumption is the lowest; The first included angle 502 is 15° / 20°: the resistance is 0.85 N·m and 0.82 N·m respectively, and the reason for the excessive resistance is that: when the first included angle 502 is 15°, the reverse friction component between the dust scraping plate 601 and the rotating disc support 500 increases, and the angle between the friction direction and the rotating direction of the rotating disc support 500 is large; when the first included angle 502 is 20°, the down dust scraping plate 601 and the surface of the rotating disc support 500 produce sliding friction, both of which cause the driving load of the rotating disc support 500 to increase, and the energy consumption of the polishing head increases by about 15%.

[0052] The first included angle 502 is 16° / 19°: the resistance is reduced to 0.78 N·m, 0.71 N·m, the first included angle 502 is optimized to make the friction direction more consistent with the rotation direction of the turntable support 500, and the reverse friction component is reduced, but there is still a small amount of additional resistance due to uneven local contact.

[0053] The first included angle 502 is 18°: the resistance is only 0.62 N·m, at this time the friction between the dust scraping plate 601 and the turntable support 500 is mainly forward rolling friction, the friction coefficient is reduced to 0.12, the friction coefficient of other angles is 0.15-0.18, the driving load of the turntable support 500 is the smallest, and the energy consumption of the polishing head is only 3% different from that without the dust scraping plate 601, which does not affect normal polishing operation.

[0054] In summary, the experimental data fully prove that the first included angle 502 of 18° is the optimal angle for the installation of the dust scraping plate 601 along the rotation direction of the turntable support 500, which can not only ensure efficient dust scraping, but also maximize the service life of the dust scraping plate 601 and reduce the energy consumption of the equipment.

[0055] Preferably, the vertical cross-sectional area of the inner fixed shell 400 gradually decreases from the position away from the turntable 200 to the position close to the turntable 200, and the vertical cross-section of the inner fixed shell 400 is perpendicular to the central axis thereof. The outer circumferential surface of the inner fixed shell 400 forms an inclined guide surface, so that when the dust contacts the surface of the inner fixed shell 400, it will slide downward under the action of gravity, avoiding the accumulation of dust on the surface of the inner fixed shell 400, and guiding the dust to move towards the dust suction port 301.

[0056] Further, the vertical cross-sectional area of the turntable support 500 gradually decreases from the position away from the turntable 200 to the position close to the turntable 200, and the vertical cross-section thereof is perpendicular to the axis thereof; the circumferential side surface of the inner fixed shell 400 is arranged in parallel with the circumferential side surface of the turntable support 500, and the second included angle 503 between the extension line of the circumferential side surface of the inner fixed shell 400 and the axis of the turntable support 500 is 15°-30°, and the preferred angle in this embodiment is 20°. The turntable support 500 adopts the same gradually changing cross-sectional area design as the inner fixed shell 400, forming a cooperative guide structure, which further improves the dust sliding efficiency; the second included angle 503 in the range of 15°-30° is verified by experiments, which can ensure smooth sliding of the dust and maintain the structural strength, achieving a balance between the guiding effect and the structural stability.

[0057] The experimental conditions in Table 2 below: room temperature 25℃, humidity 50%, dust is common calcium carbonate dust (particle size 0.1-100μm, average particle size 50μm, density 1.2g / cm³) for building wall polishing; dust sliding efficiency = (total dust amount delivered - residual dust amount) / total dust amount delivered x 100%, delivery rate 1g / min, experimental duration 30 minutes; shell compression strength test standard: the pressure value when the axial pressure is applied to the shell to produce 0.1mm deformation.

[0058] Table 2:

[0059] The dust sliding efficiency in Table 2 is analyzed as follows: When the second included angle 503 is 15°, the dust sliding efficiency is only 82.3%, and the residual dust amount is 177.2mg. Because the second included angle 503 is too small, the surface inclination of the inner fixing shell 400 is insufficient, the sliding power of the dust under the action of gravity is not enough, and part of the dust is easy to adhere to the surface of the inner fixing shell 400 to form accumulation, resulting in a lower sliding efficiency.

[0060] When the second included angle 503 is 18°, the sliding efficiency is increased to 89.7%, and the residual dust amount is reduced to 103.5mg. The increase in inclination increases the sliding power of the dust, and the adhesion phenomenon is reduced, but part of the fine component dust is still retained.

[0061] When the second included angle 503 is 20°, the sliding efficiency reaches a peak of 95.6%, and the residual dust amount is only 44.1mg. At this second included angle 503, the surface inclination of the inner fixing shell 400 is moderate, the component force of the gravity of the dust along the surface of the inner fixing shell 400 is sufficient to overcome the adhesion force between the dust and the surface of the inner fixing shell 400, and most of the dust can quickly slide down without obvious accumulation.

[0062] When the second included angle 503 is 25°, the sliding efficiency is slightly reduced to 93.2%, and the residual dust amount is increased to 68.3mg. The second included angle 503 is too large, which causes the sliding speed of the dust to be too fast, part of the dust rebounds after hitting the inner wall of the connecting cavity 700 in the sliding process, and a small amount of dust reattaches to the surface of the inner fixing shell 400, which slightly reduces the sliding efficiency.

[0063] When the second included angle 503 is 30°, the sliding efficiency is further reduced to 87.5%, and the residual dust amount is 125.4mg. The second included angle 503 is too large, which makes the surface inclination of the inner fixing shell 400 too steep, the sliding path of the dust is shortened, the rebound phenomenon is intensified, and part of the dust is easy to form vortex retention at the bottom of the connecting cavity 700, resulting in a significant decrease in sliding efficiency.

[0064] The compression strength of the inner fixing shell 400 in Table 2 is analyzed as follows: When the second included angle 503 is 15°, the inner fixing shell 400 has the highest compressive strength of 42.5 MPa. As the second included angle 503 is smaller, the radial cross-sectional dimension of the inner fixing shell 400 is larger, the structure is more uniform in stress, and the compressive capacity is stronger.

[0065] As the second included angle 503 increases, the radial cross-sectional dimension of the inner fixing shell 400 gradually decreases, and the compressive strength decreases: 40.8 MPa at 18°, 39.6 MPa at 20°, 35.7 MPa at 25°, and 31.2 MPa at 30°.

[0066] When the second included angle 503 is 20°, the inner fixing shell 400 has a compressive strength of 39.6 MPa, which is lower than 15° and 18°, but still meets the mechanical requirements during polishing operation. The conventional polishing head shell requires a compressive strength of ≥35 MPa, and will not deform or be damaged due to insufficient structural strength.

[0067] In summary, the experimental data fully prove that 20° is the optimal second included angle 503 between the outer peripheral surface of the inner fixing shell 400 and the axis, which can ensure efficient sliding of dust and maintain the structural stability of the inner fixing shell 400.

[0068] Further, the inner fixing shell 400 and the rotating disc support 500 form a connecting cavity 700, and the gap between them is matched, with a gap value controlled at 0.5-1 mm. The connecting cavity 700 is provided with a dust blocking piece 800, which is an annular brush structure for blocking the gap between the inner fixing shell 400 and the rotating disc support 500. Adjacent two dust blocking pieces 800 divide the connecting cavity 700 into sub-chambers 701. The connecting cavity 700 provides a buffer and temporary storage space for dust, avoiding direct diffusion of dust to the rear; at the same time, the dust blocking piece 800 can block the penetration of dust, and the sub-chamber 701 can avoid the random flow of dust in the connecting cavity 700, facilitating subsequent centralized discharge.

[0069] Further, the dust blocking piece 800 is provided with p, which is a positive integer ≥1. In the embodiment, p is preferably 3, and the three dust blocking pieces 800 divide the connecting cavity 700 into three sub-chambers 701. The design of multiple groups of dust blocking pieces 800 and sub-chambers 701 forms a progressive dust blocking and dust storage structure, further improving the dust blocking effect, and each sub-chamber 701 can collect dust in a specific area, facilitating centralized treatment and reducing the risk of secondary dust diffusion.

[0070] Further, the sub-chamber 701 is provided with a dust falling hole 702 on the circumferential wall of the inner fixing shell 400, the dust falling hole 702 is used to guide the dust in the sub-chamber 701 to be discharged, the dust falling hole 702 is provided with q, q is a positive integer greater than or equal to 1, and is arranged one by one with the sub-chamber 701; the dust falling hole 702 is located on the negative Y axis of the projection of the one side of the turntable support 500 which is opposite to the polishing side of the turntable 200, and the falling direction of the dust in the dust falling hole 702 is perpendicular to the dust suction direction of the dust suction port 301. The dust falling hole 702 provides a specific discharge channel for the dust in the sub-chamber 701, and the installation position of the negative Y axis ensures that the dust can fall smoothly under the action of gravity; the design perpendicular to the dust suction direction enables the falling dust to be directly captured by the negative pressure of the dust suction port 301, avoiding the scattering of the dust during the discharge process, and achieving the complete removal of the dust in the sub-chamber 701.

[0071] In order to facilitate the understanding of the technical scheme of the present application, the working principle thereof will be specifically described below: When the negative pressure dust collection polishing head is working, the turntable 200 rotates around its own central axis, the sandpaper on the polishing side thereof is in contact with the surface to be processed to perform polishing work, and the dust suction member 300 is started to generate negative pressure. Since the dust suction direction of the dust suction port 301 is perpendicular to the polishing side of the turntable 200 and directly opposite the dust settling path, most of the dust is directly sucked into the dust suction port 301 and discharged under the combined action of gravity and negative pressure.

[0072] A small amount of dust scattered to the turntable support 500 and the connecting cavity 700 will be guided by the inclined surfaces of the inner fixing shell 400 and the turntable support 500 to slide downward; part of the dust adhering to the turntable support 500 will be actively scraped off by the dust scraping plate 601, which is inclined by 15-20° along the rotation direction of the turntable 200 to efficiently remove the dust while reducing wear.

[0073] The dust blocking member 800 in the connecting cavity 700 blocks the dust from penetrating and limits the dust in the sub-chamber 701; the dust falling hole 702 on the circumferential wall of the sub-chamber 701 is located on the negative Y axis to guide the dust in the chamber to fall vertically, and the falling dust and the scraped and slid dust converge to be finally sucked into the pipeline by the negative pressure of the dust suction port 301. Through the cooperative action of vertical dust suction capture, inclined guidance, active dust scraping and sub-chamber concentrated dust discharge, the dust is efficiently removed, dust accumulation and secondary invasion are avoided, and the polishing head is ensured to operate stably for a long time.

[0074] It should be noted that the above embodiments are only used to illustrate the technical scheme of the present application and not to limit it, although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical scheme of the present application can be modified or replaced equivalently without departing from the spirit and scope of the present application, which should be covered in the scope of the claims of the present application.

Claims

1. A negative pressure dusting and polishing head, characterized by: Comprising, an outer housing (100); a rotating disc (200) arranged in the outer housing (100), the rotating disc (200) rotates around its own central axis; a dust suction member (300) arranged at the bottom of the outer housing (100), and the dust suction direction of the dust suction port (301) of the dust suction member (300) is perpendicular to the horizontal plane on which the central axis of the rotating disc (200) is located, and the dust suction direction of the dust suction port (301) is perpendicular to the side surface of the polishing side of the rotating disc (200); an inner fixed housing (400) fixedly installed in the outer housing (100); a rotating disc support member (500) arranged in the outer housing (100); further comprising a scraping member (600) arranged on the inner fixed housing (400), the scraping member (600) abuts against the outer peripheral surface of the rotating disc support member (500), and the scraping member (600) is used for scraping dust on the rotating disc support member (500); the scraping member (600) comprises n dust scraping plates (601) and m mounting plates (602), n and m are positive integers greater than or equal to 1, the n dust scraping plates (601) and the m mounting plates (602) are arranged one by one in a one-to-one correspondence, the dust scraping plate (601) is arranged on the mounting plate (602), the mounting plate (602) is arranged on the inner fixed housing (400), and the n dust scraping plates (601) are arranged along the extension direction of the outer peripheral surface of the rotating disc support member (500).

2. The negative air pressure polishing head of claim 1, wherein: the central axis of the inner fixed housing (400) is coaxially arranged with the central axis of the outer housing (100); the outer diameter of the rotating disc support member (500) is smaller than the inner diameter of the inner fixed housing (400), and the rotating disc support member (500) rotates around its own central axis.

3. A negative pressure dusting and polishing head as claimed in claim 1 or 2, characterized in that: the rotating disc (200) rotates clockwise, and the dust scraping plate (601) is located in the fourth quadrant of the projection of the side of the rotating disc (200) away from the polishing side; the first included angle (502) between the length direction of the dust scraping plate (601) and the horizontal center surface (501) of the rotating disc support member (500) is 15-20°.

4. The negative air pressure polishing head of claim 1 or 2, wherein: the vertical cross-sectional area of the inner fixed housing (400) gradually decreases from the position away from the rotating disc (200) to the position close to the rotating disc (200), wherein the vertical cross-section of the inner fixed housing (400) is perpendicular to the central axis of the inner fixed housing (400), and the outer peripheral surface of the inner fixed housing (400) is used for guiding the dust to slide downward.

5. The negative air pressure polishing head of claim 1 or 2, wherein: the vertical cross-sectional area of the rotating disc support member (500) gradually decreases from the position away from the rotating disc (200) to the position close to the rotating disc (200), wherein the vertical cross-section of the rotating disc support member (500) is perpendicular to the central axis of the rotating disc support member (500). The inner fixing shell (400) is arranged in parallel with the circumferential side of the rotating disc support (500), and the second included angle (503) between the extension line of the circumferential side of the inner fixing shell (400) and the axis of the rotating disc support (500) is 15°-30°.

6. The negative air pressure polishing head of claim 1 or 2, wherein: The inner fixing shell (400) and the rotating disc support (500) form a connecting cavity (700), and the inner fixing shell (400) and the rotating disc support (500) are in clearance fit; The connecting cavity (700) is provided with a dust blocking piece (800), the dust blocking piece (800) is used for blocking the gap between the inner fixing shell (400) and the rotating disc support (500), and adjacent two dust blocking pieces (800) separate the connecting cavity (700) into sub-chambers (701).

7. The negative air pressure polishing head of claim 6, wherein: The dust blocking piece (800) is provided with p, and p dust blocking pieces (800) separate the connecting cavity (700) into a plurality of sub-chambers (701).

8. The negative air pressure polishing head of claim 7, wherein: The sub-chamber (701) is provided with a dust falling hole (702) on the circumferential wall of the inner fixing shell (400), the dust falling hole (702) is used for guiding the dust in the sub-chamber (701) to fall out of the sub-chamber (701), and the dust falling hole (702) is also provided with q, q is a positive integer greater than or equal to 1, and q dust falling holes (702) are arranged one by one with m sub-chambers (701); The dust falling hole (702) is located on the negative Y-axis of the projection of the one side of the rotating disc support (500) on the back side of the polishing side of the rotating disc (200), and the falling direction of the dust in the dust falling hole (702) is perpendicular to the dust suction direction of the dust suction port (301).

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