Automobile brake disc surface fine treatment robot

文档序号:596753 发布日期:2021-05-28 浏览:9次 中文

阅读说明:本技术 一种汽车刹车盘表面精细化处理机器人 (Automobile brake disc surface fine treatment robot ) 是由 不公告发明人 于 2021-01-11 设计创作,主要内容包括:本发明涉及一种汽车刹车盘表面精细化处理机器人,包括工作台、固定装置、转动装置和打磨装置,所述工作台为正方形形状,工作台下方四角处安装有支撑架,工作台上端安装有固定装置,固定装置上方安装有打磨装置,固定装置下方安装有转动装置,本发明可以解决现有的刹车盘打磨机,通常采用人工固定,然后通过拧动压紧块实现对刹车盘的固定,这样经常会出现刹车盘固定不稳的情况,使得刹车盘打磨时,打磨面打磨厚度不同,从而导致刹车盘报废的问题,还可以解决现有的刹车盘打磨机对刹车盘进行上打磨通常使用同一精度进行打磨,由于刹车盘表面磨损程度不同,导致刹车盘打磨时,打磨头容易损坏的问题。(The invention relates to a robot for finely processing the surface of an automobile brake disc, which comprises a workbench, a fixing device, a rotating device and a polishing device, wherein the workbench is square, a support frame is arranged at the four corners below the workbench, the fixing device is arranged at the upper end of the workbench, the polishing device is arranged above the fixing device, and the rotating device is arranged below the fixing device. The problem that the polishing head is easy to damage when the brake disc is polished is caused.)

1. The utility model provides a car brake disc surface treatment robot that becomes more meticulous, includes workstation (1), fixing device (2), rotating device (3) and grinding device (4), its characterized in that: the polishing device is characterized in that the workbench (1) is square, a support frame (11) is arranged at the four corners below the workbench (1), a fixing device (2) is arranged at the upper end of the workbench (1), a polishing device (4) is arranged above the fixing device (2), and a rotating device (3) is arranged below the fixing device (2);

the fixing device (2) comprises a bearing plate (21), a sleeved column (22), a first clamping plate (23), a first spring (24), a second clamping plate (25), a transmission block (26), a second spring (27), a compression block (28) and a third spring (29), a round hole is formed in the circumferential direction of the workbench (1), the round hole is connected with the round bearing plate (21) in a rotating mode, the sleeved column (22) is installed in the center of the upper end of the bearing plate (21), the sleeved column (22) is of a hollow cylindrical structure, a plurality of groups of first clamping holes are formed in the outer wall, close to the lower end, of the sleeved column (22) in the circumferential direction, one clamping plate (23) is in sliding butt joint in the one clamping hole, the one clamping plate (23) is of an inverted L-shaped structure, the inner end of the one clamping plate (23) is connected with the inner wall of the sleeved column (22) through the one spring (24), and a plurality of groups of second sliding holes are formed in the circumferential direction, close to the upper end, a second clamping plate (25) is in sliding butt joint in the second sliding hole, the inner end of the second clamping plate (25) is connected with a transmission block (26), the transmission block (26) is of a right-angled triangle structure, one end, close to the inner wall of the sleeved column (22), of the transmission block (26) is connected with the inner wall of the sleeved column (22) through a second spring (27), the opposite end of the first clamping plate (23) is abutted to a pressure-bearing block (28), the pressure-bearing block (28) is of an inclined structure with the diameter gradually reduced from top to bottom, and the lower end of the pressure-bearing block (28) is connected with a bearing plate (21) through a third spring (29);

the rotating device (3) comprises a connecting column (31), a driven gear (32), a rotating motor (33) and a driving gear (34), the connecting column (31) is connected to the lower end of the supporting plate (21), the driven gear (32) is fixedly sleeved on the lower end of the connecting column (31), the rotating motor (33) is installed in the center of the lower end of the workbench (1) through a motor base, an output shaft of the rotating motor (33) is connected with the driving gear (34), and the driving gear (34) is meshed with the driven gear (32);

the polishing device (4) comprises a supporting plate (40), a horizontal plate (41), a pushing cylinder (42), a circular connecting plate (43), L-shaped connecting plates (44), connecting circular plates (45), a pressing circular plate (46), a pressing column (47), a pushing plate (48) and a polishing block (49), wherein the supporting plate (40) is symmetrically arranged on the front side and the rear side of the upper end of the workbench (1), the horizontal plate (41) is connected to the upper end of the supporting plate (40), the pushing cylinder (42) is arranged at the lower end of the horizontal plate (41), an output shaft of the pushing cylinder (42) is connected with the circular connecting plate (43), the outer end of the circular connecting plate (43) is connected with a plurality of groups of L-shaped connecting plates (44), the lower ends of the L-shaped connecting plates (44) are connected with the connecting circular plates (45), and the lower ends of the connecting circular plates (45, the lower end of the pressure circular plate (46) is provided with a lower pressure column (47), a plurality of groups of connecting holes are formed in the position, corresponding to the bearing plate (21), of the connecting circular plate (45), a push plate (48) is in sliding butt joint in the connecting holes, and the lower end of the push plate (48) is provided with a polishing block (49).

2. The automobile brake disc surface refining robot of claim 1, wherein: the outer end of the bearing plate (21) is provided with an annular protrusion (211), and the workbench (1) is provided with an annular groove corresponding to the annular protrusion (211).

3. The automobile brake disc surface refining robot of claim 1, wherein: the pushing plate (48) is of a T-shaped structure, and the lower ends of the left side and the right side of the pushing plate (48) are connected with the bottom ends of the connecting holes through a fourth spring (481).

4. The automobile brake disc surface refining robot of claim 1, wherein: the lower end of the pushing plate (48) is provided with a connecting groove, a polishing block (49) is connected in the connecting groove in a clamping mode, the right side of the lower end of the pushing plate (48) is provided with a threaded hole, and a bolt (491) is connected in the threaded hole in an internal thread mode.

5. The automobile brake disc surface refining robot of claim 1, wherein: the connecting hole outer end has been seted up the sliding tray, push plate (48) outer end is connected with chucking piece (483) of arc structure through No. five spring (482), the sliding tray is kept away from the one end of push plate (48) and has been seted up two sets of joint piece complex joint groove (484) from top to bottom, push groove (485) have been seted up to joint groove (484) outer end of lower extreme, the position that push groove (485) inner wall corresponds downside chucking groove is connected with connecting block (487) through No. six spring (486), connecting block (487) are the right triangle structure, the one end that connecting block (487) are close to chucking piece (483) is connected with pressure head (4871), connecting block (487) rake portion offsets with the pulling piece (488) of falling T-shaped structure, pulling piece (488) lower extreme is connected with pushing groove (485) tank bottom through pulling spring (489), pulling piece (488) is connected with and pulls rope (50).

6. The automobile brake disc surface refining robot of claim 5, wherein: an expansion link (4831) is connected between the clamping block (483) and the pushing plate (48).

7. The automobile brake disc surface refining robot of claim 5, wherein: a plurality of groups of guide columns (52) are connected between the circular connecting plate (43) and the workbench (1), and the pulling rope (50) penetrates through the workbench (1), passes through the guide columns (52) and finally penetrates through the circular connecting plate (43) to be connected with the pulling plate (51).

Technical Field

The invention relates to the field of automobile part machining, in particular to a robot for finely processing the surface of an automobile brake disc.

Background

When the automobile runs, the automobile is decelerated and stopped by stepping on the brake, and the actual working principle is that when the brake is stepped on, the brake calipers work to clamp the brake disc to generate braking force, so that the automobile is decelerated or stopped. The brake disc is an important part in a braking system, and the good brake disc is stable in braking, free of noise and free of shaking. At present, the export market of the car brake disc mainly used by domestic automobiles forms a certain scale, and the annual output is estimated to be about ten thousand tons only for castings. The brake disc outlet mainly aims at the accessory market, the outsourcing order is various, and each variety is produced in small batch. No matter which kind of brake disc, in the car driving process, wearing and tearing can appear for the surface is not smooth, and the car driving process can obviously experience noise and shake like this, so need polish brake disc working face, but often has following problem in the current brake disc polishes.

1. The conventional brake disc polisher is usually fixed manually, and then a brake disc is fixed by screwing a pressing block, so that the brake disc is often unstable in fixation, and the polishing thickness of a polishing surface is different during polishing of the brake disc, so that the brake disc is scrapped;

2. the existing brake disc polisher is used for polishing a brake disc at the same precision, and the polishing head is easy to damage when the brake disc is polished due to different brake disc surface abrasion degrees.

Disclosure of Invention

The technical scheme adopted by the invention to solve the technical problem is as follows: a robot for finely processing the surface of an automobile brake disc comprises a workbench, a fixing device, a rotating device and a polishing device, wherein the workbench is square, supporting frames are arranged at four corners below the workbench, the upper end of the workbench is provided with the fixing device, the polishing device is arranged above the fixing device, and the rotating device is arranged below the fixing device;

the fixing device comprises a bearing plate, a sleeve installation column, a first clamping plate, a first spring, a second clamping plate, a transmission block, a second spring, a compression block and a third spring, wherein a round hole is formed in the circumferential direction of the workbench, the round hole is connected with the round bearing plate in a rotating manner, the center of the upper end of the bearing plate is provided with the sleeve installation column, the sleeve installation column is of a hollow cylindrical structure, a plurality of groups of first clamping holes are formed in the outer wall, close to the lower end, of the sleeve installation column along the circumferential direction, one clamping plate is in sliding butt joint with the first clamping plate in the first clamping holes, the other clamping plate is of an inverted L-shaped structure, the inner end of the first clamping plate is connected with the inner wall of the sleeve installation column through the first spring, a plurality of groups of second sliding holes are formed in the upper end, close to the inner wall of the second sliding holes, the inner end of the second clamping plate is connected with the transmission block, the transmission block is of a right-angled triangle structure, one end, the opposite end of the first clamping plate is abutted against a pressed block, the pressed block is of an inclined structure with the diameter gradually reduced from top to bottom, and the lower end of the pressed block is connected with a bearing plate through a third spring; during specific work, a brake disc to be polished is placed on the bearing plate, the sleeve is provided with a hole, the column penetrates through the middle of the brake disc, when the pressed block moves downwards, the clamping plate is driven to move towards the direction of the inner wall of the sleeve, the clamping plate moves outwards, the inner support of the brake disc is realized, when the transmission block moves towards the direction of the inner wall of the sleeve, the clamping plate can be driven to move outwards, the inner support of the brake disc is realized, the different point positions of the clamping plate and the clamping plate are used for carrying out inner support on the brake disc, and the stability for placing the brake disc is enhanced.

The rotating device comprises a connecting column, a driven gear, a rotating motor and a driving gear, the connecting column is arranged at the lower end of the bearing plate, the driven gear is fixedly sleeved at the lower end of the connecting column, the rotating motor is arranged at the center of the lower end of the workbench through a motor base, an output shaft of the rotating motor is connected with the driving gear, and the driving gear is meshed with the driven gear; during specific work, the rotating motor is started, the driving gear can be driven to rotate, the driven gear is driven to rotate, the connecting column is driven to rotate, and finally the purpose of driving the bearing plate to rotate is achieved.

The polishing device comprises a supporting plate, a horizontal plate, a pushing cylinder, a circular connecting plate, an L-shaped connecting plate, a connecting circular plate, a pressing circular plate, a lower pressing column, a pushing plate and a polishing block, wherein the supporting plate is symmetrically arranged on the front side and the rear side of the upper end of the workbench, the upper end of the supporting plate is commonly connected with the horizontal plate, the pushing cylinder is arranged at the lower end of the horizontal plate, an output shaft of the pushing cylinder is connected with the circular connecting plate, the outer end of the circular connecting plate is connected with a plurality of groups of L-shaped connecting plates, the lower end of the L-shaped connecting plate is commonly connected with the connecting circular plate, the lower end of the connecting circular plate is rotatably connected with the plurality of groups of pressing circular plates corresponding to the sleeving column position, the lower pressing column is; the concrete during operation starts the promotion cylinder, and the promotion cylinder can drive circular connecting plate downstream to drive the connection plectane downstream through L shape connecting plate, finally drive and press the plectane and compress tightly the brake disc, the piece of polishing corresponds the brake disc just this moment, pushes down the post and inserts to the cover and establish in the post, the transmission piece is driven to two and is close to the direction motions that the post inner wall was established to the cover, and the piece that receives is driven downstream, realizes just polishing on surface when the brake disc rotates.

As a preferred technical scheme of the invention, the outer end of the bearing plate is provided with an annular protrusion, and the workbench is provided with an annular groove corresponding to the annular protrusion.

As a preferred technical scheme of the invention, the pushing plate is of a T-shaped structure, the lower ends of the left side and the right side of the pushing plate are connected with the bottom ends of the connecting holes through four springs, and the four springs play a role in resetting the pushing plate.

According to a preferable technical scheme, the lower end of the pushing plate is provided with a connecting groove, a polishing block is clamped in the connecting groove, the right side of the lower end of the pushing plate is provided with a threaded hole, and a bolt is connected in the threaded hole in a threaded manner.

As a preferred technical scheme of the invention, the outer end of the connecting hole is provided with a sliding groove, the outer end of the pushing plate is connected with a clamping block with an arc structure through a fifth spring, one end of the sliding groove, which is far away from the pushing plate, is provided with two groups of clamping grooves matched with the clamping blocks up and down, the outer end of the clamping groove at the lower end is provided with a pushing groove, the position, which corresponds to the clamping groove at the lower side, of the inner wall of the pushing groove is connected with a connecting block through a sixth spring, the connecting block is in a right-angled triangle structure, one end, which is close to the clamping block, of the connecting block is connected with a pressing head, an inclined part of the connecting block is abutted against a pulling block with an inverted T-shaped structure, the lower end of the pulling block is connected with the bottom of the pushing groove through a pulling spring, the pulling block is connected with a pulling rope, when the clamping block is, the pushing plate is pushed downwards to enable the pushing plate to be advanced to a fine polishing gear, the pulling rope is pulled, the pulling block moves upwards to drive the connecting block to move towards a position close to the clamping block, the clamping block is ejected out of the pressing head, the pushing plate is driven by the fourth spring to move upwards, the clamping block is clamped into the upper end connecting groove, and the polishing block returns to a coarse polishing gear.

As a preferred technical scheme of the invention, an expansion link is connected between the clamping block and the pushing plate, and the expansion link plays a role in limiting the connecting block.

As a preferred technical scheme of the invention, a plurality of groups of guide columns are connected between the circular connecting plate and the workbench, the pulling ropes pass through the workbench, then pass through the guide columns and finally pass through the circular connecting plate to be connected with the pulling plate, and all the pulling ropes can be pulled at the same part by pulling the pulling plate downwards.

Compared with the prior art, the invention has the following advantages:

1. the fixing device can be in linkage action with the polishing device, wherein the fixing device can realize inner support fixing of the brake disc, and the polishing device and the fixing device can be in linkage to clamp the brake disc up and down, so that stable fixing of the brake disc is finally realized;

2. the first clamping connection plate and the second clamping connection plate are arranged to support the brake disc internally at different point positions, so that the effect of fixing the brake disc internally is enhanced, the brake disc can be clamped up and down by the pressing circular plate and the bearing plate, the brake disc is finally stably fixed, and polishing failure caused by unstable fixation of the brake disc is prevented;

3. according to the invention, through the two groups of clamping grooves matched with the clamping blocks, when the clamping blocks are positioned in the clamping grooves at different positions, the polishing blocks are positioned at different polishing precision positions, so that the brake disc can be polished by coarse polishing and fine polishing, and the damage rate of the polishing blocks is reduced.

Drawings

The invention is further illustrated with reference to the following figures and examples.

Figure 1 is a perspective view of a brake disc;

FIG. 2 is a perspective view of a first perspective of the present invention;

FIG. 3 is a perspective view of the present invention from a second perspective;

FIG. 4 is a perspective view of a third perspective of the present invention;

FIG. 5 is a schematic view of the connection of the pull cord to the circular web of the present invention;

FIG. 6 is a schematic view showing the structure of a push plate according to the present invention;

FIG. 7 is an enlarged view of A of FIG. 6 in accordance with the present invention;

fig. 8 is a schematic structural view of the fixing device of the present invention.

Detailed Description

In order to make the technical means, the creation features, the achievement purposes and the effects of the invention easy to understand, the invention is further explained with reference to fig. 1 to 8.

A robot for finely processing the surface of an automobile brake disc comprises a workbench 1, a fixing device 2, a rotating device 3 and a polishing device 4, wherein the workbench 1 is square, a support frame 11 is arranged at four corners below the workbench 1, the fixing device 2 is arranged at the upper end of the workbench 1, the polishing device 4 is arranged above the fixing device 2, and the rotating device 3 is arranged below the fixing device 2;

the fixing device 2 comprises a bearing plate 21, a sleeved column 22, a first clamping plate 23, a first spring 24, a second clamping plate 25, a transmission block 26, a second spring 27, a compression block 28 and a third spring 29, wherein a circular hole is formed in the circumferential direction of the workbench 1, the circular hole is rotationally connected with the circular bearing plate 21, an annular protrusion 211 is arranged at the outer end of the bearing plate 21, an annular groove corresponding to the annular protrusion 211 is formed in the workbench 1, the sleeved column 22 is installed at the center of the upper end of the bearing plate 21, the sleeved column 22 is of a hollow cylindrical structure, a plurality of groups of first clamping holes are formed in the outer wall, close to the lower end, of the sleeved column 22 in the circumferential direction, a clamping plate 23 is in sliding and butt joint in the first clamping holes, the first clamping plate 23 is of an inverted L-shaped structure, the inner end of the first clamping plate 23 is connected with the inner wall of the sleeved column 22 through the first spring 24, a plurality of groups of second sliding holes are formed, a second clamping plate 25 is in sliding butt joint in the second sliding hole, the inner end of the second clamping plate 25 is connected with a transmission block 26, the transmission block 26 is of a right-angled triangle structure, one end, close to the inner wall of the sleeved column 22, of the transmission block 26 is connected with the inner wall of the sleeved column 22 through a second spring 27, the opposite end of the first clamping plate 23 is abutted against a compression block 28, the compression block 28 is of an inclined structure with the diameter gradually reduced from top to bottom, and the lower end of the compression block 28 is connected with the bearing plate 21 through a third spring 29; during specific work, the brake disc that will treat to polish is placed on bearing plate 21, the hole at brake disc middle part is passed to post 22 is established to the cover, when the piece 28 downstream that receives, a joint board 23 is driven and is established post 22 inner wall direction motion near the cover, a joint board 23 outwards removes, realize the interior support to the brake disc, when the transmission piece 26 is to establishing post 22 inner wall direction motion near the cover, can drive No. two joint boards 25 outwards movements, realize the interior support to the brake disc, a joint board 23 and No. two different positions of joint board 25 support the brake disc in carrying out, the stability that the brake disc was placed has been strengthened.

The polishing device 4 comprises a support plate 40, a horizontal plate 41, a pushing cylinder 42, a circular connecting plate 43, L-shaped connecting plates 44, connecting circular plates 45, a pressing circular plate 46, a lower pressing column 47, a pushing plate 48 and a polishing block 49, wherein the support plate 40 is symmetrically arranged on the front side and the rear side of the upper end of the workbench 1, the upper end of the support plate 40 is commonly connected with the horizontal plate 41, the pushing cylinder 42 is arranged at the lower end of the horizontal plate 41, an output shaft of the pushing cylinder 42 is connected with the circular connecting plate 43, the outer end of the circular connecting plate 43 is connected with a plurality of groups of L-shaped connecting plates 44, the lower end of the L-shaped connecting plate 44 is commonly connected with the connecting circular connecting plate 45, a plurality of groups of guide columns 52 are connected between the circular connecting plate 43 and the workbench 1, the lower end of the connecting circular plate 45 is rotatably connected with a plurality of groups of pressing, a pushing plate 48 is in sliding butt joint in the connecting hole, the pushing plate 48 is of a T-shaped structure, the lower end of the pushing plate 48 is provided with a connecting groove, a polishing block 49 is clamped in the connecting groove, the lower end of the polishing block 49 is provided with a polishing layer, the right side of the lower end of the pushing plate 48 is provided with a threaded hole, a bolt 491 is in threaded connection with the threaded hole, the bolt 491 plays a role of fixing the polishing block 49, the lower ends of the left side and the right side of the pushing plate 48 are connected with the bottom end of the connecting hole through a four-number spring 481, the four-number spring 481 plays a role of resetting the pushing plate 48, the outer end of the connecting hole is provided with a sliding groove, the outer end of the pushing plate 48 is connected with a clamping block 483 of an arc-shaped structure through a five-number spring 482, a telescopic rod 4831 is connected between the clamping block 483 and the pushing plate 48, the telescopic rod 4831 plays a role, the outer end of a clamping groove 484 at the lower end is provided with a pushing groove 485, the position of the inner wall of the pushing groove 485, which corresponds to a clamping groove at the lower side, is connected with a connecting block 487 through a six-number spring 486, the connecting block 487 is in a right-angled triangle structure, one end of the connecting block 487, which is close to the clamping block 483, is connected with a pressing head 4871, the inclined part of the connecting block 487 is abutted against a pulling block 488 in an inverted T-shaped structure, the lower end of the pulling block 488 is connected with the bottom of the pushing groove 485 through a pulling spring 489, the pulling block 488 is connected with a pulling rope 50, the pulling rope 50 penetrates through the workbench 1, finally penetrates through a circular connecting plate 43 through a guiding column 52 and is connected with a pulling plate 51, the pulling plate 51 is arranged under the circular connecting plate 43, all the pulling ropes 50 can be pulled at the same part as long as the pulling plate 51 is pulled downwards, when the clamping block 483, when the polishing block 49 is in a fine polishing gear, the pushing plate 48 is pushed downwards to advance to the fine polishing gear by pulling the pulling rope 50 and the pulling block 488 to move upwards to drive the connecting block 487 to move towards a position close to the clamping block 483, the pressing head 4871 pushes out the clamping block 483, the four-gauge spring 481 drives the pushing plate 48 to move upwards, the clamping block 483 is clamped into an upper end connecting groove, and the polishing block 49 returns to the coarse polishing gear; during specific work, the pushing cylinder 42 is started, the pushing cylinder 42 can drive the circular connecting plate 43 to move downwards, the L-shaped connecting plate 44 drives the connecting circular plate 45 to move downwards, the pressing circular plate 46 is finally driven to press the brake disc, the polishing block 49 just corresponds to the brake disc at the moment, the pressing column 47 is inserted into the sleeving column 22, the transmission block 26 is driven to move towards the direction close to the inner wall of the sleeving column 22, and the pressing block 28 is driven to move downwards.

The rotating device 3 comprises a connecting column 31, a driven gear 32, a rotating motor 33 and a driving gear 34, the connecting column 31 is connected to the lower end of the supporting plate 21, the driven gear 32 is fixedly sleeved at the lower end of the connecting column 31, the rotating motor 33 is installed at the center of the lower end of the workbench 1 through a motor base, an output shaft of the rotating motor 33 is connected with the driving gear 34, and the driving gear 34 is meshed with the driven gear 32; during specific work, the rotating motor 33 is started, the driving gear 34 can be driven to rotate, the driven gear 32 is driven to rotate, the connecting column 31 is driven to rotate, the purpose of driving the bearing plate 21 to rotate is finally achieved, the bearing plate 21 can drive the brake disc to rotate, and polishing of the surface is achieved just when the brake disc rotates.

During the operation, a brake disc to be polished is placed on the bearing plate 21, the sleeved columns 22 penetrate through holes in the middle of the brake disc, the pushing cylinder 42 is started, the pushing cylinder 42 can drive the circular connecting plate 43 to move downwards, so that the L-shaped connecting plate 44 drives the connecting circular plate 45 to move downwards, and finally drives the pressing circular plate 46 to press the brake disc tightly, at the moment, the polishing block 49 just corresponds to the brake disc, the pressing column 47 is inserted into the sleeved columns 22, the transmission block 26 is driven to move towards two directions close to the inner wall of the sleeved columns 22, so that the second clamping plate 25 is driven to move outwards, the inner support of the brake disc is realized, the pressing block 28 is driven by the pressing column 47 to move downwards, so that the first clamping plate 23 is driven to move towards the direction close to the inner wall of the sleeved columns 22, the first clamping plate 23 moves outwards, the inner support of the brake disc is realized through different point positions of the second clamping plate 25, the stability that the brake disc was placed has been strengthened, starts to rotate motor 33, can drive driving gear 34 and rotate to drive driven gear 32 and rotate, and then drive spliced pole 31's rotation, finally played and driven bearing board 21 pivoted purpose, in the rotation process, the brake disc surface is fully polished.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

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