Grinding processing device for rotor wing wrapping composite material

Abstract

The invention relates to the technical field of rotor wing production and processing, and particularly discloses a grinding processing device for a rotor wing wrapping composite material. The two sides of the sealing cover are connected with the main air suction pipe and the air injection pipe respectively, the main air suction pipe is located at the front end of the polishing rod when the polishing rod moves, and the air injection pipe is located at the rear end of the polishing rod when the polishing rod moves. The sealing cover is arranged on the periphery of the grinding rod in a sleeving mode, then the position of the mounting frame is adjusted through an external numerical control machine tool so that the grinding rod can abut against the edge of the rotor wing, meanwhile, the sealing cover abuts against the edge of the rotor wing, the grinding rod is sealed, and hard resin or carbon fiber chippings generated during grinding of the grinding rod cannot be splashed due to the sealing cover; therefore, the scraps adsorbed on the edge of the rotor wing are reduced, the scraps on the edge of the rotor wing are prevented from being rolled by the polishing rod during movement, and the condition that the performance of the rotor wing is reduced due to random scratches or pits formed on the surface of the rotor wing is avoided.

Description

Technical Field

[0001] The present invention belongs to the technical field of rotor production and processing, and particularly relates to a grinding device for grinding the outer composite material of a rotor. Background Art

[0002] At present, in order to make the rotors of unmanned aerial vehicles or aircraft meet the requirements of light weight, high strength, fatigue resistance, corrosion resistance, and aerodynamic performance, a layer of composite material needs to be coated on the surface of the PMI foam material used to make the rotors. Such composite materials can be glass fiber cloth, carbon fiber cloth, and hybrid fiber cloth, etc. After the composite material is coated on the surface of the PMI foam material, it is necessary to perform hot pressing and curing to shape the multi-layer composite material and the PMI foam material.

[0003] Taking carbon fiber cloth as an example, currently, mostly prepreg carbon fiber cloth is used as the composite material of the rotor. Because the prepreg carbon fiber cloth is pre-impregnated with resin during the production process and has better chemical and physical properties, such as strength, stiffness, and heat resistance, after high-temperature curing. However, after the prepreg carbon fiber cloth is hot-pressed and cured, resin edges are generated around the rotor. Therefore, it is necessary to grind the periphery of the rotor after hot-pressing and shaping. Currently, a large amount of hard resin or carbon fiber debris is generated during the grinding of the rotor periphery, and these debris are easily attached to the surface of the rotor. If the debris is attached to the area to be ground on the rotor, when the grinding rod moves to this place, it will crush the debris above, resulting in random scratches or pits on the surface of the rotor, which will reduce the performance of the rotor and thus increase the difficulty of subsequent balance debugging tests. Summary of the Invention

[0004] The purpose of the present invention is to provide a grinding device for grinding the outer composite material of a rotor aiming at the deficiencies of the prior art, so as to solve the technical problem that when the grinding rod grinds the periphery of the rotor in the prior art, the grinding rod may crush the debris attached to the surface of the rotor, resulting in random scratches or pits on the surface of the rotor.

[0005] The purpose of the present invention can be achieved by the following technical solutions: A grinding device for grinding the outer composite material of a rotor, including a fixing seat for fixing the rotor, a mounting frame connected to an external numerical control machine tool, a driving member, and a grinding rod. The device further includes: A sealing cover, the sealing cover is installed around the grinding rod, one side of the sealing cover abuts against the edge of the rotor, and the sealing cover seals the grinding space of the grinding rod; A main suction pipe and a spray pipe, the two sides of the sealing cover are respectively connected with the main suction pipe and the spray pipe. The main suction pipe is located at the front end when the grinding rod moves, and the spray pipe is located at the rear end when the grinding rod moves.

[0006] As a preference of the above technical solution, the sealing cover is divided into two halves, and the middle positions on the sides of the two halves of the sealing cover close to the edge of the rotor are rotatably connected. Upper rings and lower rings are respectively arranged at the middle positions of the top and bottom of the sealing cover. Both the upper ring and the lower ring are sleeved on the periphery of the grinding rod. Telescopic parts are arranged between the upper ring and the lower ring and the two halves of the sealing cover, and the sides of the two halves of the sealing cover away from the rotor are connected together through the telescopic parts.

[0007] As a preference of the above technical solution, an elastic rod is arranged on the side of the mounting bracket close to the grinding rod, a pressing rod is arranged at one end of the elastic rod, and the pressing rod abuts against the side surface of the sealing cover.

[0008] As a preference of the above technical solution, telescopic plates are arranged at the top and bottom of the inner cavity of the sealing cover, and the telescopic plates elastically abut against the surface of the edge of the rotor.

[0009] As a preference of the above technical solution, the main suction pipe is connected with a secondary suction pipe through a connecting pipe. The secondary suction pipe is located on the side of the sealing cover close to the rotor. The telescopic plate is inclined, and the inclination direction is towards the secondary suction pipe.

[0010] As a preference of the above technical solution, a bayonet is formed on the side of the sealing cover close to the rotor, the edge of the rotor is sleeved in the bayonet, and cleaning brushes II are arranged at the top and bottom of the bayonet and abut against the surface of the rotor.

[0011] As a preference of the above technical solution, a cleaning brush I is installed between the upper ring and the lower ring. The cleaning brush I is located on the side of the grinding rod away from the rotor, and the surface of the cleaning brush I abuts against the surface of the grinding rod.

[0012] As a preference of the above technical solution, a telescopic part I is installed on the mounting bracket. The output end of the telescopic part I is connected with a connecting block. A telescopic part II is installed at the bottom of the connecting block. The output end of the telescopic part II is installed with a right-angle plate, and the two inner sides of the right-angle plate respectively abut against the top and the side of the unground edge of the rotor.

[0013] The beneficial effects of the present invention are as follows: 1. In the present invention, the sealing cover is sleeved on the periphery of the grinding rod, and then the position of the mounting bracket is adjusted by an external numerical control machine tool to make the grinding rod abut against the edge of the rotor. At the same time, the sealing cover abuts against the edge of the rotor to seal the grinding rod. The hard resin or carbon fiber debris generated during the grinding of the grinding rod cannot splash due to the sealing cover, so as to reduce the debris adsorbed on the edge of the rotor, and further avoid the grinding rod rolling over the debris on the edge of the rotor during movement, and avoid the formation of random scratches or pits on the surface of the rotor, resulting in the reduction of the rotor performance; 2. In the present invention, when debris is generated, air is extracted through the main suction pipe, and the debris generated by grinding can be sucked away from the grinding rod and inside the sealing cover, effectively preventing debris from remaining on the edge of the rotor and inside the sealing cover, thereby reducing the probability of debris adhering to the edge of the rotor, and further preventing the grinding rod from rolling over the debris on the edge of the rotor when moving, avoiding random scratches or pits on the surface of the rotor and reducing the rotor performance; when the main suction pipe extracts air, the jet pipe jets air towards the main suction pipe, so that the generated debris can be blown towards the main suction pipe, thereby improving the efficiency of the main suction pipe in cleaning debris, enabling the generated debris to be cleaned up in the first time, further reducing the probability of debris adhering to the edge of the rotor, and further preventing the grinding rod from rolling over the debris on the edge of the rotor when moving, avoiding random scratches or pits on the surface of the rotor and reducing the rotor performance; 3. In the present invention, the gas ejected by the jet pipe can cool down the position where the edge of the rotor is ground, and the main suction pipe can suck away the high-temperature air generated at the position where the edge of the rotor is ground, thereby cooling down the position where the edge of the rotor is ground, effectively preventing local overheating from causing depression or carbon fiber cloth layer peeling at the grinding position of the rotor; 4. In the present invention, when the sealing cover abuts against the edge of the rotor, the telescopic plates at the upper and lower positions inside the sealing cover will abut against the top and bottom of the rotor. On the one hand, it can improve the sealing performance of the sealing cover and prevent debris from leaking out; on the other hand, the telescopic plates at the upper and lower positions are equivalent to clamping the rotor. Since the grinding rod will cause the rotor to vibrate when grinding the edge of the rotor, such vibration can be effectively prevented through the restriction of the telescopic plates, thereby improving the grinding accuracy and quality. At the same time, when the rotor vibrates and contacts the grinding rod, it may cause peeling between the carbon fiber cloth layers. In this way, through the restriction of the telescopic plates, peeling between the carbon fiber cloth layers on the surface of the rotor can be effectively prevented, avoiding damage to the surface of the rotor during grinding; in addition, the contact surface between the telescopic plate and the rotor can be made of an elastic material, so as to avoid hard contact between the telescopic plate and the surface of the rotor when they abut, resulting in damage to the surface of the rotor. Description of the Drawings

[0014] Figure 1 is a schematic diagram of the overall structure of the present invention; Figure 2 is a schematic diagram of the connection structure between the sealing cover and the grinding rod; Figure 3 is a schematic diagram of the internal structure of the sealing cover; Figure 4 is a schematic diagram of the cleaning brush I; Figure 5 is a schematic diagram of the elastic rod and the pressing rod structure.

[0015] In the figure: 1. Fixed seat; 2. Mounting frame; 3. Driving member; 4. Grinding rod; 5. Sealing cover; 51. Upper ring; 52. Lower ring; 53. Bayonet; 54. Cleaning brush 1; 6. Main exhaust pipe; 61. Connecting pipe; 62. Sub-exhaust pipe; 7. Jet pipe; 8. Telescopic plate; 9. Cleaning brush 2; 10. Telescopic part; 11. Elastic rod; 111. Pressing rod; 12. Telescopic member 1; 13. Connecting block; 14. Telescopic member 2; 15. Right-angle plate. Specific implementation manner

[0016] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0017] As Figures 1 - 3 shown, a grinding and leveling processing device for the outer wrapped composite material of the rotor blade includes a fixed seat 1 for fixing the rotor blade, a mounting frame 2 connected to an external numerical control machine tool, a driving member 3 and a grinding rod 4. The device further includes: A sealing cover 5 is installed around the grinding rod 4. One side of the sealing cover 5 abuts against the edge of the rotor blade. The sealing cover 5 seals the grinding space of the grinding rod 4. A main exhaust pipe 6 and a jet pipe 7 are respectively connected to both sides of the sealing cover 5. The main exhaust pipe 6 is located at the front end when the grinding rod 4 moves, and the jet pipe 7 is located at the rear end when the grinding rod 4 moves.

[0018] In one case of this embodiment, the main exhaust pipe 6 is connected to an external exhaust unit, which can be an exhaust pump, and the jet pipe 7 is connected to an external blowing unit, which can be a blowing pump.

[0019] In actual application of this embodiment, the sealing cover 5 is sleeved around the grinding rod 4, and then the position of the mounting frame 2 is adjusted by an external numerical control machine tool so that the grinding rod 4 abuts against the edge of the rotor blade. At the same time, the sealing cover 5 abuts against the edge of the rotor blade to seal the grinding rod 4. The hard resin or carbon fiber debris generated during the grinding of the grinding rod 4 cannot splash due to the sealing cover 5, thereby reducing the adsorption of debris on the edge of the rotor blade, and further avoiding the grinding rod 4 from rolling over the debris on the edge of the rotor blade during movement, and avoiding the formation of random scratches or pits on the surface of the rotor blade, resulting in a reduction in the performance of the rotor blade; When debris is generated, air is extracted through the main suction pipe 6, and the debris generated by grinding can be sucked away from the grinding rod 4 and inside the sealing cover 5, effectively preventing debris from remaining on the edge of the rotor and inside the sealing cover 5, thereby reducing the probability of debris adhering to the edge of the rotor. Furthermore, it can prevent the grinding rod 4 from crushing the debris on the edge of the rotor when moving, avoiding the formation of random scratches or pits on the surface of the rotor, which may lead to a reduction in rotor performance. When the main suction pipe 6 extracts air, the air injection pipe 7 injects air towards the main suction pipe 6. This can blow the generated debris towards the main suction pipe 6, thereby improving the efficiency of the main suction pipe 6 in cleaning debris, ensuring that the generated debris is removed immediately, further reducing the probability of debris adhering to the edge of the rotor, and further preventing the grinding rod 4 from crushing the debris on the edge of the rotor when moving, avoiding the formation of random scratches or pits on the surface of the rotor, which may lead to a reduction in rotor performance. During grinding, fine dust is also generated. The floating of this fine dust may affect the visual recognition and positioning system on the numerical control machine tool. By cleaning this dust through the main suction pipe 6 and the air injection pipe 7, it can effectively prevent the dust from affecting the visual recognition and positioning system, avoiding errors in the visual recognition and positioning system, thereby ensuring the accuracy of rotor edge grinding, and further improving the quality of rotor grinding. The air injection pipe 7 injects air into the sealing cover 5, while the main suction pipe 6 extracts air from the sealing cover 5. In order to enable the debris to be smoothly removed by the main suction pipe 6, it is necessary to make the power of the suction unit connected to the main suction pipe 6 greater than the power of the blowing unit connected to the air injection pipe 7, thereby ensuring that the debris is smoothly removed. The gas ejected by the air injection pipe 7 can cool down the position where the rotor edge is ground, and the main suction pipe 6 can extract the high-temperature air generated at the position where the rotor edge is ground, thereby cooling down the position where the rotor edge is ground, effectively preventing local overheating from causing depressions or carbon fiber cloth layer peeling at the rotor grinding position. When the grinding rod 4 grinds, it drives the sealing cover 5 to move together. When the sealing cover 5 moves, it will squeeze the resin edge of the rotor edge. After being squeezed, the resin edge is prone to falling off, which can reduce the grinding amount of the grinding rod 4, thereby reducing the generation of debris, further reducing the probability of debris adhering to the edge of the rotor, preventing the grinding rod 4 from crushing the debris on the edge of the rotor when moving, and avoiding the formation of random scratches or pits on the surface of the rotor, which may lead to a reduction in rotor performance.

[0020] Furthermore, the sealing cover 5 is divided into two halves. The middle positions of the two halves of the sealing cover 5 close to the rotor edge are rotatably connected. The upper ring 51 and the lower ring 52 are respectively provided at the middle positions of the top and bottom of the sealing cover 5. Both the upper ring 51 and the lower ring 52 are sleeved outside the grinding rod 4. Telescopic parts 10 are provided between the upper ring 51 and the lower ring 52 and the two halves of the sealing cover 5. The two halves of the sealing cover 5 away from the rotor are connected together through the telescopic parts 10.

[0021] In one case of this embodiment, the telescopic part 10 can be a telescopic rubber skin, which is used to block the hollow part of the two halves of the sealing cover 5.

[0022] In actual application of this embodiment, since the edges of the rotors are not all straight, and most of the edges of the rotors are curved, by dividing the sealing cover 5 into two halves and rotatably connecting the two halves of the sealing cover 5, the two halves of the sealing cover 5 can better fit the edges of the rotors according to the curvature of the rotor edges, ensuring the sealing effect of the sealing cover 5, providing better cleaning conditions for the main air extraction pipe 6 and the jet pipe 7, avoiding the leakage of debris and increasing the probability of debris being adsorbed on the surface of the rotor, preventing the grinding rod 4 from rolling over the debris at the edge of the rotor during movement, and avoiding the formation of random scratches or pits on the surface of the rotor, which may lead to a reduction in the performance of the rotor.

[0023] Furthermore, an elastic rod 11 is provided on the side of the mounting bracket 2 close to the grinding rod 4, and a pressing rod 111 is provided at one end of the elastic rod 11, and the pressing rod 111 abuts against the side surface of the sealing cover 5.

[0024] In one case of this embodiment, the pressing rod 111 is bifurcated and abuts against the two halves of the sealing cover 5 respectively.

[0025] In actual application of this embodiment, the elastic rod 11 abuts against the two halves of the sealing cover 5 through the pressing rod 111, so that the two halves of the sealing cover 5 can always fit the edges of the rotors, further ensuring the sealing effect of the sealing cover 5.

[0026] As Figure 2 and Figure 3 shown, telescopic plates 8 are provided at both the top and bottom of the inner cavity of the sealing cover 5, and the telescopic plates 8 elastically abut against the surface of the rotor edges.

[0027] In one case of this embodiment, the telescopic plate 8 is of an elastic telescopic type.

[0028] In actual application of this embodiment, when the sealing cover 5 abuts against the rotor edges, the telescopic plates 8 at the upper and lower positions in the sealing cover 5 will abut against the top and bottom of the rotor. On the one hand, it can improve the sealing performance of the sealing cover 5 and avoid the leakage of debris; on the other hand, the telescopic plates 8 at the upper and lower positions are equivalent to clamping the rotor. Since the rotor will vibrate when the grinding rod 4 grinds the edge of the rotor, the vibration of the rotor can be effectively avoided through the restriction of the telescopic plates 8, thereby improving the grinding accuracy and quality. At the same time, when the rotor vibrates and contacts the grinding rod 4, it may cause delamination of the carbon fiber cloth on the surface of the rotor. In this way, through the restriction of the telescopic plates 8, delamination of the carbon fiber cloth on the surface of the rotor can be effectively avoided, and damage to the surface of the rotor during grinding can be avoided; in addition, the contact surface between the telescopic plate 8 and the rotor can be made of an elastic material, so as to avoid damage to the surface of the rotor caused by hard contact when the telescopic plate 8 abuts against the surface of the rotor.

[0029] Furthermore, the main air extraction pipe 6 is connected with a secondary air extraction pipe 62 through a connecting pipe 61. The secondary air extraction pipe 62 is located on the side of the sealing cover 5 close to the rotor. The telescopic plate 8 is inclined, and the inclined direction is towards the secondary air extraction pipe 62.

[0030] In actual application of this embodiment, when the inclined telescopic plate 8 moves, it can smooth the burrs generated on the surface of the rotor edge during grinding, avoiding directly driving the burrs to move and causing delamination between the carbon fiber cloth layers on the rotor surface, thereby avoiding damage to the rotor surface. At the same time, the inclined telescopic plate 8 makes there be a certain gap between the sealing cover 5 and the rotor edge. The most debris and dust are generated at the position where the rotating part of the two half-sealing covers 5, that is, the grinding rod 4, contacts the rotor edge. The generated debris and dust can pass through this gap and the gap of the rotating part of the two half-sealing covers 5, and the passed debris and dust are sucked away through the auxiliary exhaust pipe 62, cooperating with the main exhaust pipe 6 to clean the debris and dust in the sealing cover 5, so that the debris and dust generated during grinding can be cleaned as much as possible, avoiding the leakage of debris and increasing the probability of debris being adsorbed on the rotor surface, avoiding the grinding rod 4 rolling over the debris on the rotor edge during movement, and avoiding the formation of random scratches or pits on the rotor surface, resulting in a reduction in rotor performance.

[0031] Furthermore, a bayonet 53 is provided on the side of the sealing cover 5 close to the rotor, the edge of the rotor is sleeved in the bayonet 53, and cleaning brushes II 9 are provided at both the top and bottom of the bayonet 53, and the cleaning brushes II 9 are in contact with the rotor surface.

[0032] In actual application of this embodiment, when the sealing cover 5 moves, the upper and lower cleaning brushes II 9 can clean the top and bottom of the rotor edge, so that the rotor edge remains clean when the grinding rod 4 moves to this position, thereby further avoiding the leakage of debris and increasing the probability of debris being adsorbed on the rotor surface, avoiding the grinding rod 4 rolling over the debris on the rotor edge during movement, and avoiding the formation of random scratches or pits on the rotor surface, resulting in a reduction in rotor performance.

[0033] As Figure 3 and Figure 4 shown, a cleaning brush I 54 is installed between the upper ring 51 and the lower ring 52. The cleaning brush I 54 is located on the side of the grinding rod 4 away from the rotor, and the surface of the cleaning brush I 54 is in contact with the surface of the grinding rod 4.

[0034] In actual application of this embodiment, the cleaning brush I 54 can clean the debris or dust embedded on the surface of the grinding rod 4, avoiding the formation of a passivation layer on the surface of the grinding rod 4 by the embedded debris or dust, thereby ensuring the grinding effect of the grinding rod 4.

[0035] As Figure 1 and Figure 5 shown, a telescopic member I 12 is installed on the mounting frame 2. The output end of the telescopic member I 12 is connected to a connecting block 13. A telescopic member II 14 is installed at the bottom of the connecting block 13. The output end of the telescopic member II 14 is installed with a right-angle plate 15, and both sides of the inner side of the right-angle plate 15 are respectively in contact with the top and the side of the unground edge of the rotor.

[0036] In one case of this embodiment, both the first telescopic member 12 and the second telescopic member 14 can be elastic telescopic rods.

[0037] In actual application of this embodiment, the first telescopic member 12 and the second telescopic member 14 are stretched, so that the two inner sides of the right-angle plate 15 respectively abut against the top and the side of the unpolished edge of the rotor. Cooperating with the telescopic plate 8 at the upper and lower positions in the sealing cover 5 to limit the edge of the rotor can further effectively avoid the vibration of the rotor, thereby improving the polishing accuracy, improving the polishing quality, and preventing the surface of the rotor from being damaged.

[0038] The foregoing has shown and described the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification are only used to illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and these changes and improvements all fall within the scope of the present invention claimed.

Claims

1. A grinding device for a composite material wrapped around a rotor, comprising a fixing seat (1) for fixing the rotor, a mounting frame (2) connected to an external CNC machine tool, a driving member (3) and a grinding rod (4), characterized in that: The device also includes: A sealing cover (5), wherein the outer periphery of the grinding rod (4) is provided with a sealing cover (5), one side of the sealing cover (5) abuts against the edge of the rotor, and the sealing cover (5) seals the grinding space of the grinding rod (4); A main air extraction pipe (6) and an air injection pipe (7), wherein the two sides of the sealing cover (5) are respectively connected with the main air extraction pipe (6) and the air injection pipe (7), wherein the main air extraction pipe (6) is located at the front end of the grinding rod (4) when it moves, and the air injection pipe (7) is located at the rear end of the grinding rod (4) when it moves.

2. The flattening processing device for rotor outer covering composite material according to claim 1 is characterized in that: The sealing cover (5) is divided into two halves, and the two halves of the sealing cover (5) are rotatably connected at the middle position of one side close to the edge of the rotor. An upper ring (51) and a lower ring (52) are respectively provided at the middle position of the top and the bottom of the sealing cover (5). The upper ring (51) and the lower ring (52) are both sleeved on the outer periphery of the grinding rod (4). A telescopic portion (10) is provided between the upper ring (51) and the lower ring (52) and the two halves of the sealing cover (5). The two halves of the sealing cover (5) are connected together at the side away from the rotor via the telescopic portion (10).

3. The flattening processing device for rotor outer covering composite material according to claim 2 is characterized in that: An elastic rod (11) is provided on one side of the mounting frame (2) close to the polishing rod (4), and a pressure rod (111) is provided at one end of the elastic rod (11), the pressure rod (111) being in contact with the side surface of the sealing cover (5).

4. The flattening processing device for rotor outer covering composite material according to claim 1 is characterized in that: Telescopic plates (8) are provided at the top and bottom of the inner cavity of the sealing cover (5), and the telescopic plates (8) elastically abut against the edge surface of the rotor.

5. The flattening processing device for rotor outer covering composite material according to claim 4 is characterized in that: The main air extraction pipe (6) is connected to an auxiliary air extraction pipe (62) via a connecting pipe (61); the auxiliary air extraction pipe (62) is located on a side of the sealing cover (5) close to the rotor; the telescopic plate (8) is arranged to be inclined, and the inclination direction is toward the auxiliary air extraction pipe (62).

6. The flattening processing device for rotor outer covering composite material according to claim 1 is characterized in that: A bayonet (53) is provided on one side of the sealing cover (5) close to the rotor, and the edge of the rotor is sleeved in the bayonet (53). A second cleaning brush (9) is provided at the top and bottom of the bayonet (53), and the second cleaning brush (9) abuts against the surface of the rotor.

7. The flattening processing device for rotor outer covering composite material according to claim 2 is characterized in that: A cleaning brush (54) is installed between the upper ring (51) and the lower ring (52); the cleaning brush (54) is located on a side of the grinding rod (4) away from the rotor, and the surface of the cleaning brush (54) abuts against the surface of the grinding rod (4).

8. The flattening processing device for rotor outer covering composite material according to claim 1 is characterized in that: A telescopic member 1 (12) is mounted on the mounting frame (2); the output end of the telescopic member 1 (12) is connected to a connecting block (13); a telescopic member 2 (14) is mounted at the bottom of the connecting block (13); a right-angle plate (15) is mounted at the output end of the telescopic member 2 (14); two inner surfaces of the right-angle plate (15) respectively abut against the top and side of the unpolished edge of the rotor.

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