Air cylinder device, sanding equipment with same and control method of sanding equipment

Abstract

The invention discloses an air cylinder device, sanding equipment with the air cylinder device and a control method of the sanding equipment, the air cylinder device comprises a cylinder body, a piston assembly and an air cylinder gland, an air cylinder cavity is formed in the cylinder body, the piston assembly is arranged in the air cylinder cavity, a rodless cavity is connected with an external air source through a first air path arranged on the bottom wall of the air cylinder cavity, and a second air path is arranged on the bottom wall of the air cylinder cavity. The first gas circuit comprises a high-pressure gas circuit and a low-pressure gas circuit, the rodless cavity is connected with an external gas source through the first gas circuit, the first gas circuit comprises the high-pressure gas circuit and the low-pressure gas circuit, output pressure can be rapidly adjusted by controlling gas supply of the high-pressure gas circuit or the low-pressure gas circuit, and the structure is simple and efficient. According to the sanding equipment and the control method of the sanding equipment, at least one key of the key type sanding pad comprises the air cylinder device, during sanding, the air cylinder device in the keys at the corresponding position of the edge of the plate is at least controlled to output low pressure, on the premise that the sanding pressure is guaranteed, the pressure borne by the edge of the plate is effectively reduced, and the sanding quality of the plate is improved. The edge of the plate is prevented from being damaged in the sanding process, and the percent of pass of the plate is greatly increased.

Description

Technical Field

[0001] The present invention belongs to the technical field of sanding equipment, and in particular relates to a cylinder device, sanding equipment having the same, and a control method for the sanding equipment. Background Art

[0002] In the sheet metal processing industry, sanding is a core process for ensuring surface flatness and thickness uniformity. Traditional sanding equipment often uses a fixed sanding pad, which has the drawback of poor adaptability to curved surfaces, corners, and other irregular shapes. To address this, piano-key sanding pad technology has emerged. Using multiple independent pressure units, it simulates the contact pressure of piano keys, theoretically enabling zoned and flexible pressure application on the sheet metal surface.

[0003] The current mainstream piano-key sanding pad power system uses multiple, evenly distributed cylinders as a pressure source. These cylinders operate in a constant pressure output mode, making them unable to respond in real time to fluctuations in sheet thickness. In actual production, it has been found that when there are sudden changes in sheet thickness at the edge (such as localized bulges caused by edge banding adhesive overflow), the fixed pressure causes a sharp increase in contact stress between the sanding pad and the sheet, which can easily cause the substrate to collapse and break. This defect is particularly prominent in the processing of thin density board, significantly affecting the yield rate.

[0004] While existing technologies attempt to improve adaptability by increasing cylinder density, they are limited by the response delay of the air circuit system, making it difficult to match the feed speed of high-speed sanders. During continuous processing, the edges of the sheet metal are prone to ripples, burrs, and other defects due to prolonged pressure, resulting in unstable processing quality.

[0005] To alleviate the pressure overload problem, some solutions adopt a compromise solution of reducing the overall working pressure. However, this leads to insufficient effective sanding pressure, which not only shortens the service life of the sanding belt, but also forces an increase in the number of sanding passes, significantly increasing energy consumption costs.

[0006] In view of this, the present invention is proposed. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a cylinder device, a sanding device having the same, and a control method for the sanding device.

[0008] To achieve the above object, the technical solution of the present invention is:

[0009] In a first aspect, the present invention provides a cylinder device, comprising a cylinder body, a piston assembly and a cylinder gland, wherein a cylinder cavity is provided in the cylinder body, the piston assembly is arranged in the cylinder cavity, and comprises a piston cylinder and a piston rod and a piston connected to each other, the cylinder gland covers the outer surface of the opening side of the cylinder cavity and is used to fix the piston assembly, a through hole is provided in the middle of the cylinder gland for reciprocating motion of the piston rod, the bottom of the piston cylinder is open, and the piston, the side wall of the piston cylinder and the bottom wall of the cylinder cavity jointly enclose a rodless cavity, the rodless cavity is connected to an external gas source via a first gas path provided on the bottom wall of the cylinder cavity, and the first gas path comprises a high-pressure gas path and a low-pressure gas path;

[0010] The rod chamber of the piston cylinder includes a backup pressure chamber connected to the rodless chamber, and a motion chamber connected to the backup pressure chamber. The side wall of the backup pressure chamber is provided with an air hole, and a second air path corresponding to the air hole is provided at a corresponding position on the side wall of the cylinder chamber.

[0011] Furthermore, the high-pressure gas circuit and the low-pressure gas circuit are respectively provided with a first gas storage chamber, a second gas storage chamber, a first pressure solenoid valve, and a second pressure solenoid valve.

[0012] Furthermore, the first air storage chamber and the second air storage chamber are respectively connected to an external air source, and the opening and closing of the high-pressure air circuit and the low-pressure air circuit and the output air pressure are adjusted by regulating the first pressure solenoid valve and the second pressure solenoid valve.

[0013] Furthermore, the inner wall of the piston cylinder is provided with a first boss and a second boss in sequence along the direction from the inside of the cylinder cavity to the outside, the bottom of the piston cylinder is open, the first boss and the bottom wall of the cylinder body are defined as a rodless cavity, the second boss and the first boss are defined as a backup pressure cavity, the second boss and the cylinder pressure cover are defined as a motion cavity, and the piston reciprocates in the working cavity.

[0014] Furthermore, the inner diameters of the rodless cavity, the backup pressure cavity and the motion cavity decrease in sequence.

[0015] Furthermore, the piston assembly further comprises:

[0016] The sealing assembly comprises a first sealing ring arranged between the air hole and the bottom of the piston cylinder, and a second sealing ring arranged between the air hole and the top of the piston cylinder.

[0017] Furthermore, the first sealing ring is arranged outside the side wall of the backup pressure chamber;

[0018] The second sealing ring is arranged outside the side wall of the movement chamber.

[0019] In a second aspect, the present invention provides a sanding device, comprising a conveying mechanism, a sanding mechanism, and a plate edge detection mechanism, wherein the sanding mechanism comprises a piano-key type sanding pad, wherein the piano-key type sanding pad comprises a plurality of keys arranged in sequence, and at least one of the keys comprises the cylinder device as described above.

[0020] Furthermore, in the piano key type sanding pad, at least the piano key located at the edge includes the cylinder device.

[0021] In a third aspect, the present invention further provides a control method for the sanding equipment as described above, comprising: during sanding, controlling at least the cylinder device in the key corresponding to the edge of the plate to output low pressure.

[0022] After adopting the above technical solution, the cylinder device, sanding equipment having the same, and control method of the sanding equipment provided by the present invention have the following beneficial effects compared with the prior art:

[0023] 1. The cylinder device provided by the present invention has a rodless chamber connected to an external gas source through a first gas circuit. The first gas circuit includes a high-pressure gas circuit and a low-pressure gas circuit. The output pressure can be quickly adjusted by controlling the gas supply of the high-pressure gas circuit or the low-pressure gas circuit. The structure is simple and efficient.

[0024] 2. In the cylinder device provided by the present invention, the rodless chamber is independently supplied with air through the first air path, and the standby pressure chamber is connected to the second air path through the air hole on the side wall of the piston cylinder to form an air pressure transition zone. This structure can reduce the peak impact force of the piston end; the standby pressure chamber serves as a buffer partition of the rod chamber, and back pressure is injected in advance through the second air path before the piston moves to the end, which shortens the response time compared with the single-chamber structure; the diameter decreasing design of rodless chamber > standby pressure chamber > moving chamber forms a dynamic balance between the air pressure gradient and the force direction of the piston, thereby improving the energy conversion efficiency.

[0025] 3. In the cylinder device provided by the present invention, the first sealing ring isolates the high-pressure gas circuit, and the second sealing ring blocks the backflow of pollutants. The double-stage sealing structure effectively reduces the leakage rate.

[0026] 4. In the sanding equipment and the control method of the sanding equipment provided by the present invention, at least one key of the piano-key sanding pad includes the above-mentioned cylinder device. During sanding, at least the cylinder device in the key corresponding to the edge of the plate is controlled to output low pressure. While ensuring the sanding pressure, the pressure on the edge of the plate is effectively reduced, thereby avoiding damage to the edge of the plate during the sanding process and greatly improving the qualified rate of the plate.

[0027] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] The accompanying drawings are part of the present invention and are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute an undue limitation of the present invention. Obviously, the drawings described below are only some embodiments. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without inventive effort. In the accompanying drawings:

[0029] Figure 1 is a cross-sectional view of the cylinder device provided by the present invention;

[0030] Figure 2 is a cross-sectional view of a piston assembly in a cylinder device provided by the present invention;

[0031] Figure 3 It is a partial enlarged view of the piston assembly in the cylinder device provided by the present invention.

[0032] In the picture:

[0033] 1. Cylinder body;

[0034] 11, first gas circuit; 111, high-pressure gas circuit; 112, low-pressure gas circuit;

[0035] 12. Second air path;

[0036] 13. First pressure solenoid valve;

[0037] 14. Second pressure solenoid valve;

[0038] 15. First air storage chamber;

[0039] 16. Second air storage chamber;

[0040] 17. The third air storage chamber;

[0041] 2. Piston assembly;

[0042] 21. Piston;

[0043] 22. Piston rod;

[0044] 23, piston cylinder; 231, rodless chamber; 232, rod chamber; 2321, standby pressure chamber; 2322, motion chamber; 233, first boss; 234, second boss;

[0045] 24. Sealing assembly; 241. First sealing ring; 242. Second sealing ring;

[0046] 25. Stomata;

[0047] 3. Cylinder gland;

[0048] 4. Fix the bolts.

[0049] It should be noted that these drawings and textual descriptions are not intended to limit the conceptual scope of the present invention in any way, but rather to illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention but are not used to limit the scope of the present invention.

[0051] In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the present invention.

[0052] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; and direct or indirect connections through an intermediary. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0053] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0054] [Example 1]

[0055] like Figure 1-3 As shown, this embodiment provides a cylinder device, including a cylinder body 1, a piston assembly 2 and a cylinder gland 3. The cylinder body 1 is provided with a cylinder cavity, and the piston assembly 2 is arranged in the cylinder cavity. The modular design of the piston assembly 2 facilitates quick disassembly and maintenance.

[0056] Furthermore, the piston assembly 2 includes a piston cylinder 23 and a piston rod 22 and a piston 21 connected to each other. The cylinder cover 3 covers the outer surface of the opening side of the cylinder cavity and is used to fix the piston assembly 2. A through hole is provided in the middle of the cylinder cover 3 for the reciprocating motion of the piston rod 22.

[0057] Furthermore, the bottom of the piston cylinder 23 is open, and the piston 21, the side walls of the piston cylinder 23, and the bottom wall of the cylinder cavity together enclose a rodless cavity 231. The rodless cavity 231 is connected to an external air source via a first air path 11 provided on the bottom wall of the cylinder cavity. The rod cavity 232 of the piston cylinder 23 includes a backup pressure cavity 2321 connected to the rodless cavity 231, and a motion cavity 2322 connected to the backup pressure cavity 2321. The side walls of the rodless cavity 231 are slidably and tightly fitted with the piston 21, and the inner wall of the motion cavity 2322 is slidably and tightly fitted with the piston rod 22.

[0058] The sidewall of the backup pressure chamber 2321 is provided with an air hole 25, and a corresponding position on the sidewall of the cylinder chamber is provided with a second air path 12 corresponding to the air hole 25. By controlling the external air sources of the first air path 11 and the second air path 12, a pressure differential is generated between the rodless chamber 231 and the backup pressure chamber 2321, further enabling the reciprocating motion of the piston rod 22. Specifically, when the air pressure in the rodless chamber 231 is greater than the air pressure in the backup pressure chamber 2321, the piston rod 22 extends; otherwise, the piston rod 22 retracts. Furthermore, the rodless chamber 231 is independently supplied with air via the first air path 11, while the backup pressure chamber 2321 is connected to the second air path 12 via the air hole 25 in the sidewall of the piston cylinder 23, forming an air pressure transition zone. This structure reduces the peak impact force at the end of the piston 21. The backup pressure chamber 2321 serves as a buffer zone for the rod chamber 232, injecting back pressure through the second air path 12 before the piston reaches its end, thus shortening the response time compared to a single-chamber structure.

[0059] Furthermore, the inner wall of the piston cylinder 23 is provided with a first boss 233 and a second boss 234 in sequence along the direction from the inside of the cylinder cavity to the outside. The bottom of the piston cylinder 23 is open. The first boss 233 and the bottom wall of the cylinder body 1 are defined as a rodless cavity 231, the second boss 234 and the first boss 233 are defined as a backup pressure cavity 2321, and the second boss 234 and the cylinder cover 3 are defined as a motion cavity 2322. The piston 21 reciprocates in the working cavity. In a preferred embodiment, the inner diameters of the rodless cavity 231, the backup pressure cavity 2321 and the motion cavity 2322 decrease in sequence. The decreasing diameter design of the rodless cavity 231>backup pressure cavity 2321>motion cavity 2322 forms a dynamic balance between the air pressure gradient and the force direction of the piston, thereby improving the energy conversion efficiency.

[0060] Furthermore, the cylinder gland 3 is fixedly connected to the cylinder body 1 via fixing bolts 4. In a preferred embodiment, the fixing bolts 4 are evenly distributed along the circumference of the cylinder gland 3, with a number of 2-8. The circumferential distribution of 2-8 fixing bolts 4 enables quick disassembly of the cylinder gland 3, shortening the replacement time of the piston assembly 2.

[0061] Furthermore, the piston assembly 2 includes a sealing assembly comprising a first sealing ring 241 disposed between the air hole 25 and the bottom of the piston cylinder 23, and a second sealing ring 242 disposed between the air hole 25 and the top of the piston cylinder 23. In a preferred embodiment, the first sealing ring 241 is disposed outside the sidewall of the backup pressure chamber 2321, while the second sealing ring 242 is disposed outside the sidewall of the movement chamber 2322. The first sealing ring 241 isolates the high-pressure air path 111, while the second sealing ring 242 prevents backflow of contaminants. This dual-stage sealing structure effectively reduces leakage.

[0062] In a preferred embodiment, the first sealing ring 241 and the second sealing ring 242 are O-shaped rubber sealing rings or fluororubber sealing rings.

[0063] [Example 2]

[0064] This embodiment provides a dual-gas-circuit cylinder device. While other structures are the same as those of the aforementioned embodiment, the first gas circuit 11 of the cylinder device provided in this embodiment includes a high-pressure gas circuit 111 and a low-pressure gas circuit 112 .

[0065] Specifically, the high-pressure gas circuit 111 and the low-pressure gas circuit 112 are respectively provided with a first air storage chamber 15, a second air storage chamber 16, and a first pressure solenoid valve 13, and a second pressure solenoid valve 14. The first air storage chamber 15 and the second air storage chamber 16 are arranged in the side wall of the cylinder body 1, and the first pressure solenoid valve 13 and the second pressure solenoid valve 14 are arranged outside the bottom wall of the cylinder body 1.

[0066] The first air storage chamber 15 and the second air storage chamber 16 are respectively connected to an external air source, and the opening and closing of the high-pressure air circuit 111 and the low-pressure air circuit 112 and the output air pressure are adjusted by regulating the first pressure solenoid valve 13 and the second pressure solenoid valve 14. The standby pressure chamber 2321 is connected to the third air storage chamber 17, and the third air storage chamber 17 is connected to the external air circuit. In the working state, the third air storage chamber 17 inputs a constant third air pressure into the standby pressure chamber 2321, and the rodless chamber 231 outputs the first air pressure through the high-pressure air circuit 111 or the second air pressure through the low-pressure air circuit 112, wherein the first air pressure>the second air pressure>the third air pressure. In this way, by regulating the first pressure solenoid valve 13 and the second pressure solenoid valve 14, the piston rod 22 can finally output different pressures, and the output pressure conversion can be easily realized. When the piston needs to be reset, just close the output of the high-pressure air circuit 111 and the low-pressure air circuit 112.

[0067] [Example 3]

[0068] This embodiment provides a sanding device, including a conveying mechanism, a sanding mechanism, and a plate edge detection mechanism. The sanding mechanism includes a piano-key sanding pad, which includes a plurality of keys arranged in sequence, at least one of which includes the cylinder device provided in the above embodiment.

[0069] Specifically, the conveying mechanism can be a conveyor belt. The piano-key sanding pad has piano-key keys arranged in a row, with their arrangement direction perpendicular to the conveying direction of the conveyor belt. A plate is placed on the conveyor belt and moves along the conveyor belt. The power mechanism in the piano-key keys above the plate outputs downward pressure, causing the sanding plate to contact the plate and sand the plate surface. It should be noted that the overall structure of the sanding equipment can adopt a commonly used structure currently available on the market. This is not the focus of the present invention and is not described in detail here.

[0070] In a preferred embodiment, in a piano-key sanding pad of a sanding device, multiple keys are powered by the cylinder device provided in the aforementioned embodiment. Preferably, at least the keys located at the edge include the cylinder device. More preferably, all keys include the cylinder device.

[0071] The plate edge detection mechanism can adopt common mechanisms in the existing technology, such as machine vision equipment, laser equipment, pressure sensing equipment, etc. Its specific principles and structures are not the focus of protection of the present invention and will not be described here. Its position is not limited. It can be combined with the sanding mechanism, or combined with the conveying mechanism, or it can be a separate setting independent of the two.

[0072] This embodiment further provides a control method for the above-mentioned sanding equipment, including: during sanding, the plate edge detection mechanism detects the edge position of the plate, and at least controls the cylinder device in the key corresponding to the plate edge to supply air through the low-pressure air circuit to output low pressure, thereby effectively reducing the pressure on the plate edge while ensuring the sanding pressure, and avoiding damage to the plate edge during the sanding process. Specifically, the plate edge includes at least the left and right edges in the plate forward direction, and during the plate forward process, the cylinder devices in the keys corresponding to the left and right edges above the left and right edges supply air through the low-pressure air circuit to output low pressure. Preferably, the plate edge also includes the front and rear edges of the plate, and during the plate forward process, when the plate enters and leaves the piano-key-type sanding pad, the cylinder devices in the keys corresponding to the front and rear edges above the front and rear edges supply air through the low-pressure air circuit to output low pressure.

[0073] In a preferred embodiment, the pressure output of the cylinder devices in multiple keys is also adjusted based on the dimensional information of the plate. Exemplarily, the dimensional information of the plate includes the width and / or thickness of the plate. If the plate is wider or thinner, the plate edges can withstand lower pressure. The cylinder devices in the outermost keys corresponding to the left and right edges of the plate's forward direction are supplied with air via a low-pressure air circuit to output low pressure. If the plate is narrower or thicker, the plate edges can withstand higher pressure. The cylinder device in the outermost key corresponding to the left and right edges of the plate's forward direction is supplied with air via a low-pressure air circuit to output low pressure. Furthermore, the dimensional information can be manually input or automatically detected by a detection mechanism installed in the sanding equipment.

[0074] In a preferred embodiment, the pressure output of the cylinder devices in the multiple keys is also adjusted according to the plate's forward speed. For example, when the plate's forward speed is slow, the plate's edges can withstand lower pressure, and the cylinder devices in the outermost keys corresponding to the left and right edges of the plate's forward direction are supplied with air through the low-pressure air circuit to output low pressure. When the plate's forward speed is fast, the plate's edges can withstand higher pressure, and the cylinder device in the outermost key corresponding to the left and right edges of the plate's forward direction is supplied with air through the low-pressure air circuit to output low pressure.

[0075] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0076] The above description is merely a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Although the present invention has been disclosed as above in terms of a preferred embodiment, it is not intended to limit the present invention. Any technician familiar with this patent can make slight changes or modifications to equivalent embodiments of equivalent changes using the above-mentioned technical contents without departing from the scope of the technical solution of the present invention. The implementation schemes in the above-mentioned embodiments can also be further combined or replaced. However, any simple modifications, equivalent changes and modifications made to the above-mentioned embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the solution of the present invention.

Claims

1. A cylinder device, comprising a cylinder body, a piston assembly, and a cylinder gland, wherein the cylinder body is provided with a cylinder cavity, the piston assembly is disposed in the cylinder cavity, and comprises a piston cylinder and a piston rod and a piston connected to each other, the cylinder gland covering the outer surface of the opening side of the cylinder cavity and being used to fix the piston assembly, and a through hole is provided in the middle of the cylinder gland for the reciprocating motion of the piston rod, characterized in that: The bottom of the piston cylinder is open, and the piston, the side wall of the piston cylinder and the bottom wall of the cylinder cavity together enclose a rodless cavity, and the rodless cavity is connected to an external gas source through a first gas path provided on the bottom wall of the cylinder cavity, wherein the first gas path includes a high-pressure gas path and a low-pressure gas path; The rod chamber of the piston cylinder includes a backup pressure chamber connected to the rodless chamber, and a motion chamber connected to the backup pressure chamber. The side wall of the backup pressure chamber is provided with an air hole, and a second air path corresponding to the air hole is provided at a corresponding position on the side wall of the cylinder chamber.

2. The cylinder device according to claim 1, wherein: The high-pressure gas circuit and the low-pressure gas circuit are respectively provided with a first gas storage chamber, a second gas storage chamber, a first pressure solenoid valve, and a second pressure solenoid valve.

3. The cylinder device according to claim 2, wherein: The first air storage chamber and the second air storage chamber are respectively connected to an external air source, and the opening and closing of the high-pressure air circuit and the low-pressure air circuit and the output air pressure are adjusted by regulating the first pressure solenoid valve and the second pressure solenoid valve.

4. The cylinder device according to claim 1, wherein: The inner wall of the piston cylinder is provided with a first boss and a second boss in sequence along the direction from the inside of the cylinder cavity to the outside. The bottom of the piston cylinder is open. A rodless cavity is defined between the first boss and the bottom wall of the cylinder body, a backup pressure cavity is defined between the second boss and the first boss, and a moving cavity is defined between the second boss and the cylinder pressure cover. The piston reciprocates in the working cavity.

5. The cylinder device according to claim 1, wherein: The inner diameters of the rodless cavity, the backup pressure cavity and the motion cavity decrease in sequence.

6. The cylinder device according to claim 1, wherein: The piston assembly further comprises: The sealing assembly comprises a first sealing ring arranged between the air hole and the bottom of the piston cylinder, and a second sealing ring arranged between the air hole and the top of the piston cylinder.

7. The cylinder device according to claim 6, characterized in that: The first sealing ring is arranged outside the side wall of the backup pressure chamber; The second sealing ring is arranged outside the side wall of the movement chamber.

8. A sanding device comprising a conveying mechanism, a sanding mechanism, and a plate edge detection mechanism, wherein the sanding mechanism comprises a piano-key-shaped sanding pad, the piano-key-shaped sanding pad comprising a plurality of piano keys arranged in sequence, and wherein: At least one of the keys comprises a cylinder device according to any one of claims 1-7.

9. The sanding device according to claim 8, characterized in that: In the piano key type sanding pad, at least the piano keys located at the edge include the cylinder device.

10. A control method for a sanding device according to claim 8 or 9, characterized in that: During sanding, at least the cylinder device in the key corresponding to the edge of the plate is controlled to output low pressure.

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