CN216812527U - Rolling linear guide rail pair with integrated ball circulation retaining structure - Google Patents
Rolling linear guide rail pair with integrated ball circulation retaining structure Download PDFInfo
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- CN216812527U CN216812527U CN202122280659.5U CN202122280659U CN216812527U CN 216812527 U CN216812527 U CN 216812527U CN 202122280659 U CN202122280659 U CN 202122280659U CN 216812527 U CN216812527 U CN 216812527U
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- linear guide
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Abstract
The utility model discloses a rolling linear guide rail pair with an integrated ball circulation retaining structure, which comprises a linear guide rail, a slider body and returners respectively fixed at two ends of the slider body, wherein two upper guide rail roller ways and two lower guide rail roller ways are respectively arranged on two side walls of the linear guide rail in a bilateral symmetry manner; the linear guide rail pair assembling device has the advantages that the assembling efficiency of plastic parts is improved, the operation noise of the linear guide rail pair is well controlled, the overall precision and the production efficiency of the linear guide rail pair are improved, and the overall manufacturing cost of the linear guide rail pair is saved.
Description
Technical Field
The utility model relates to the field of guide rail pairs, in particular to a rolling linear guide rail pair with an integrated ball circulation and maintenance structure.
Background
Through long-term efforts, market share of domestic numerical control machine tools and basic manufacturing equipment is steadily improved, the market share is preemptively high in key fields, and as a functional part of the numerical control machine tool and the basic manufacturing equipment, improvement of product performance of a linear guide rail pair is necessary, and further basic supporting capacity for industry is improved.
The linear guide rail pair consists of a linear guide rail and a slide block component, and the working mode of the linear guide rail pair is that the slide block component makes reciprocating linear motion on the linear guide rail along a longitudinal hardened guide rail roller path through the rolling of an internal ball. At present, the sliding block assembly consists of a sliding block body, an upper retainer, a middle retainer, a lower retainer, a reverser blocking piece, a ball and a sealing end cover. The sealing end cover is arranged on the end face of the return device, the return device is arranged on the two end faces of the sliding block body, and the retaining sheet of the return device is inlaid on the return device, so that the purpose of returning is achieved by changing the running direction of the balls, the balls can run into the return hole of the sliding block body from the rolling path of the sliding block body, and then run back to the rolling path of the sliding block body from the return hole. The upper, middle and lower retainers are arranged on the roller paths at the inner cavity of the sliding block body, so that the balls cannot fall off during the circulating operation, and the return devices arranged on the two end surfaces of the sliding block body position and fix the balls through the tenon-and-mortise structure.
At present, in the assembly process of the sliding block component, the retainer and the baffle of the reverser need to be assembled on the corresponding position of the sliding block body manually, the retainer and the baffle of the reverser are mutually matched, however, as the closed circulation motion path of the ball is formed by combining various plastic parts and the sliding block body, if the smoothness of the path is ensured, the smoothness and the precision of the integral operation of the linear guide rail pair need to be ensured, the processing technical requirements and the assembly technical requirements of each plastic part on the sliding block body and each plastic part are high, the situation that the wall of a return hole of the sliding block body has small roughness and the return hole has small position dimensional tolerance needs to be ensured, the relative position size between a sliding block roller path and the return hole needs to be ensured, otherwise, the plastic part cannot be mounted on the correct position of the sliding block body and can generate dislocation deformation, and the fit size of each plastic part is not in place and also directly influences subsequent assembly effect and the whole operation of a linear guide rail pair. In addition, because a certain number of plastic parts need to be assembled, the assembly efficiency is directly influenced, the comprehensive cost needed in the manufacturing process is high comprehensively, and for the linear guide rail pair running at high speed, the more parts forming the sliding block assembly, the more difficult the noise generated when the balls run in a closed circulation path is to be controlled, and the more difficult the smoothness and the accuracy of the whole operation of the linear guide rail pair are to be ensured.
Therefore, the technical problem to be solved by the technical personnel in the field is urgently needed to provide a scheme capable of improving the overall precision and the production efficiency of the linear guide rail pair in design, development and production.
SUMMERY OF THE UTILITY MODEL
In order to solve the defects in the prior art, the utility model provides the rolling linear guide rail pair with the integrated ball circulation retaining structure, which improves the smoothness of the overall operation of the linear guide rail pair, reduces the processing technical requirements on the sliding block body and the assembly technical requirements on the plastic part under the condition of a certain degree, improves the assembly efficiency of the plastic part, better controls the operation noise of the linear guide rail pair, improves the overall precision and the production efficiency of the linear guide rail pair, and saves the overall manufacturing cost of the linear guide rail pair.
The technical scheme adopted by the utility model for solving the technical problems is as follows: a rolling linear guide rail pair with an integrated ball circulation retaining structure comprises a linear guide rail, a slider body and return devices respectively fixed at two ends of the slider body, wherein two upper guide rail roller ways and two lower guide rail roller ways are respectively arranged on two side walls of the linear guide rail in a bilateral symmetry manner, the slider body is installed on the linear guide rail, the rolling linear guide rail pair also comprises two sets of ball circulation retaining devices which are integrally arranged in an inner cavity of the slider body in a bilateral symmetry manner, each set of ball circulation retaining device comprises an upper retainer, a middle retainer and a lower retainer, an upper slider roller way corresponding to the upper guide rail roller way and a lower slider roller way corresponding to the lower guide rail roller way are symmetrically arranged in the slider body, the upper retainer, the middle retainer and the lower retainer are sequentially and longitudinally arranged in the slider body from top to bottom, and an upper limiting roller way is formed between the upper retainer and the middle retainer, go up the slider raceway go up restriction raceway and two form last circulation channel between the ware returns, go up install a plurality of in the circulation channel and go up the ball, down the holder with form restriction raceway once between the well holder, down the slider raceway down restriction raceway and two return and form circulation channel down between the ware, install a plurality of ball down in the circulation channel down.
The upper limiting roller path and the upper sliding block roller path are provided with an upper arc-shaped stop block, an upper arc-shaped roller path is arranged on the upper arc-shaped stop block, the reverser is covered and installed on the upper arc-shaped stop block, and an upper steering roller path is formed between the upper arc-shaped roller path and the reverser. In the structure, the upper arc-shaped rolling way arranged on the upper arc-shaped check block is used for assisting the upper ball to perform steering action, and an upper steering rolling way is formed between the upper arc-shaped rolling way and the return device, so that the upper ball can infinitely circulate in an upper circulation channel, and the upper ball is directly contacted with the upper guide rail rolling way on the linear guide rail and then indirectly supports the whole sliding block body.
A lower arc-shaped stop block is arranged between the lower limiting raceway and the lower sliding block raceway, a lower arc-shaped raceway is arranged on the lower arc-shaped stop block, the reverser is arranged on the lower arc-shaped stop block in a covering mode, and a lower steering raceway is formed between the lower arc-shaped raceway and the reverser. In this structure, the lower arc raceway that sets up on the lower arc dog is used for supplementary down the ball to turn to the action, it and return to and form the raceway that turns to once between the ware, and ball just can endless loop in lower circulation passage like this to thereby lower ball direct contact supports whole slider body indirectly behind the lower rail raceway on the linear guide, and the slider body carries out vertical straight reciprocating motion on driving whole slider body along the linear guide through its inside circulation roll of going up ball and lower ball.
The upper retainer is provided with upper grooves distributed along the longitudinal direction, and the lower retainer is provided with lower grooves distributed along the longitudinal direction. In the structure, the contact area between the upper ball and the upper retainer is reduced by the upper groove, and the contact area between the lower ball and the lower retainer is reduced by the lower groove, so that the overall operation noise can be effectively reduced.
The slider is internally and symmetrically provided with an upper guide pipe and a lower guide pipe which are distributed at intervals, the upper guide pipe and the lower guide pipe are respectively and longitudinally fixed in the slider, an upper slider roller path is formed in the upper guide pipe, upper clearance grooves communicated with the upper slider roller path are symmetrically formed in the side wall of the upper guide pipe, lower clearance grooves communicated with the lower slider roller path are symmetrically formed in the lower guide pipe, and lower clearance grooves communicated with the lower slider roller path are symmetrically formed in the side wall of the lower guide pipe. In this structure, the upper guide pipe and the lower guide pipe are all made of synthetic resin, the upper guide pipe is used for accommodating the upper ball, the lower guide pipe is used for accommodating the lower ball, so that the upper ball and the lower ball are not in direct contact with the sliding block body any more, the processing technical requirement of the sliding block body is reduced, the processing difficulty is reduced, the production efficiency is improved, and the manufacturing cost is reduced.
And a sealing end cover is arranged on the outer side of each reverser, a screw is mounted on each sealing end cover, and one end of each screw penetrates through the reverser and is fixed on the sliding block body. In this structure, adopt the mode of fix with screw, easily dismouting, the later maintenance of being convenient for, end cover not snap-on returns to the ware, but rather with the slider body is fixed, thereby it is firmly pressed from both sides and is established between the slider body and end cover to return to the ware, in addition, returns to and is connected through other fastening screw between the ware and the slider body, and then realizes reliably fixed purpose.
Two reinforcing ribs are fixed on the upper side surface of the inner cavity of the sliding block body at intervals, the two reinforcing ribs and the sliding block body are integrally formed, and a weight reduction groove is formed between the two reinforcing ribs. In this structure, the setting of strengthening rib is avoided here structure too singly thin and is leaded to intensity not enough, and there is certain clearance with linear guide upper top surface, and direct contact not only plays spacing effect, has so both accomplished to subtract the material and has handled and can guarantee again as far as possible that working of plastics thickness is even for the reduction is out of shape when plastics shaping.
The upper guide rail roller path and the lower guide rail roller path form a 90-degree included angle, the upper guide rail roller path is matched with the upper ball by a 45-degree contact angle configuration, and the lower guide rail roller path is matched with the lower ball by a 45-degree contact angle configuration. Thereby realizing that the upper ball and the lower ball bear the uniform load in the upper, lower, left and right directions.
Compared with the prior art, the utility model has the advantages that:
1) the linear guide pair adopts an integrated ball circulation retaining structure, the number of required assembly parts is effectively reduced, the installation errors of each retainer and each arc-shaped check block in the prior art are avoided, the assembly technical requirements can be reduced to a certain extent, the original complex assembly process is simplified, the effect of high-efficiency assembly is achieved, and the assembly efficiency of the sliding block assembly is improved.
2) The upper guide pipe and the lower guide pipe are arranged in the sliding block body, so that the metal-to-metal collision of the original balls and the sliding block body is converted into the metal-to-synthetic resin collision in the operation process of the sliding block body, and the upper groove, the lower groove, the upper clearance groove and the lower clearance groove are arranged at the same time, so that the contact area between each ball and the sliding block body is reduced, the overall noise of the linear guide rail pair can be reduced to a greater extent, the abrasion speed of each ball can be reduced, and the service life of the linear guide rail pair can be prolonged;
3) the quantity of plastic parts is effectively reduced, the combination of a plurality of plastic parts is changed into an integrated ball circulation retaining device, the integrated ball circulation retaining device is integrated on the sliding block body, the processing requirement on the sliding block body is reduced, the production efficiency is improved, the manufacturing cost is reduced, the problems of the matching size precision and the integral deformation of the retainer and the stop block when the original split combination type is not considered at present are solved, the size consistency and the integrity of the plastic parts are ensured, the matching between the plastic parts and the sliding block body is more compactly fitted, the smoothness of an upper circulation channel and a lower circulation channel can be easily ensured, so that the operation of each ball is smoother and more stable when returning, the severe vibration of a linear guide rail pair in high-speed operation is avoided, the operation noise of the linear guide rail pair is effectively controlled, the integral operation smoothness of the linear guide rail pair is improved, Stability and accuracy.
Drawings
FIG. 1 is a schematic perspective view of the present invention;
FIG. 2 is a cross-sectional view of the present invention;
FIG. 3 is a schematic perspective view of a slider body according to the present invention;
FIG. 4 is a front view of the slider body of the present invention;
FIG. 5 is a cross-sectional view of a slider body according to the present invention;
fig. 6 is a schematic perspective view of the return device of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following drawings and examples, but the present invention is not limited thereto.
The first embodiment is as follows: as shown in the figure, the rolling linear guide rail pair with the integrated ball circulation retaining structure comprises a linear guide rail 1, a slider body 2 and a reverser 3 respectively fixed at two ends of the slider body 2, two upper guide rail roller ways 11 and two lower guide rail roller ways 12 are respectively arranged on two side walls of the linear guide rail 1 in a bilateral symmetry manner, the slider body 2 is arranged on the linear guide rail 1, the rolling linear guide rail pair also comprises two sets of ball circulation retaining devices 4 which are integrally arranged in an inner cavity of the slider body 2 in a bilateral symmetry manner, each set of ball circulation retaining device 4 comprises an upper retainer 41, a middle retainer 42 and a lower retainer 43, an upper slider roller way 21 corresponding to the upper guide rail roller way 11 and a lower slider roller way 22 corresponding to the lower guide rail roller ways 12 are symmetrically arranged in the slider body 2, the upper retainer 41, the middle retainer 42 and the lower retainer 43 are sequentially and longitudinally arranged in the slider body 2 from top to bottom, an upper limiting raceway 44 is formed between the upper retainer 41 and the middle retainer 42, an upper circulation channel is formed between the upper sliding block raceway 21, the upper limiting raceway 44 and the two reversers 3, a plurality of upper balls 46 are installed in the upper circulation channel, a lower limiting raceway 45 is formed between the lower retainer 43 and the middle retainer 42, a lower circulation channel is formed between the lower sliding block raceway 22, the lower limiting raceway 45 and the two reversers 3, and a plurality of lower balls 48 are installed in the lower circulation channel.
The upper retainer 41, the middle retainer 42 and the lower retainer 43 are formed by injecting synthetic resin into corresponding predetermined positions by injection molding technique on the basis of the slider 2 which has been machined to meet the technical requirements, and then cooling and demolding, and once the injection molding of the slider 2 is completed, the ball circulation holding device 4 cannot be detached from the slider 2, and the level of the manufacturing process is improved to some extent unless it is destructively detached.
Example two: as shown in the figure, the other structure is the same as the first embodiment, except that an upper arc-shaped stop 49 is arranged between the upper limiting raceway 44 and the upper slider raceway, an upper arc-shaped raceway 50 is arranged on the upper arc-shaped stop 49, the reverser 3 is covered and mounted on the upper arc-shaped stop 49, and an upper steering raceway is formed between the upper arc-shaped raceway 50 and the reverser 3. In this structure, the upper arc-shaped rolling path 50 provided on the upper arc-shaped stopper 49 is used to assist the upper ball 46 to perform a turning action, and an upper turning rolling path is formed between the upper arc-shaped rolling path and the return device 3, so that the upper ball 46 can be endlessly circulated in the upper circulation path, and the upper ball 46 directly contacts the upper rail rolling path 11 of the linear guide 1 to indirectly support the entire slider body 2.
A lower arc-shaped stop block 51 is arranged between the lower limiting raceway 45 and the lower sliding block raceway, a lower arc-shaped raceway 52 is arranged on the lower arc-shaped stop block 51, the reverser 3 is covered and installed on the lower arc-shaped stop block 51, and a lower steering raceway is formed between the lower arc-shaped raceway 52 and the reverser 3. In the structure, the lower arc-shaped rolling way arranged on the lower arc-shaped stop block 51 is used for assisting the lower ball 48 to perform steering action, a lower steering rolling way is formed between the lower arc-shaped rolling way and the return device 3, so that the lower ball 48 can infinitely circulate in a lower circulating channel, the lower ball 48 is directly contacted with the lower guide rail rolling way 12 on the linear guide rail 1 to indirectly support the whole slider body 2, and the slider body 2 drives the whole slider body 2 to perform longitudinal linear reciprocating motion along the linear guide rail 1 through the circulating rolling of the inner upper ball 46 and the lower ball 48 of the slider body 2.
The upper holder 41 is provided with upper grooves 411 distributed along the longitudinal direction, and the lower holder is provided with lower grooves 431 distributed along the longitudinal direction. In this structure, the arrangement of the upper grooves 411 reduces the contact area between the upper balls 46 and the upper cage 41, and the arrangement of the lower grooves 431 reduces the contact area between the lower balls 48 and the lower cage 43, which can effectively reduce the overall operating noise.
The slider body 2 is symmetrically provided with an upper guide pipe 23 and a lower guide pipe 24 which are distributed at intervals up and down, the upper guide pipe 23 and the lower guide pipe 24 are respectively fixed in the slider body 2 along the longitudinal direction, an upper slider raceway 21 is formed in the upper guide pipe 23, upper clearance grooves 25 communicated with the upper slider raceway 21 are symmetrically arranged on the side wall of the upper guide pipe 23, a lower slider raceway 22 is formed in the lower guide pipe 24, and lower clearance grooves 26 communicated with the lower slider raceway 22 are symmetrically arranged on the side wall of the lower guide pipe 24. In this structure, the upper guide tube 23 is used for accommodating the upper ball 46, and the lower guide tube 24 is used for accommodating the lower ball 48, so that the upper ball 46 and the lower ball 48 are no longer in direct contact with the slider body 2, the processing technical requirements of the slider body 2 are reduced, the processing difficulty is reduced, the production efficiency is improved, and the manufacturing cost is reduced.
Example three: as shown in the figures, the other structure is the same as the embodiment, but the difference is that a sealing end cover 5 is arranged on the outer side of each reverser 3, a screw is mounted on each sealing end cover 5, and one end of the screw is fixed on the sliding block body 2 after penetrating through the reverser 3. In this structure, adopt the mode of fix with screw, easily dismouting, the later maintenance of being convenient for, end cover 5 is not directly fixed on returning the ware 3, but is fixed with the slider body 2, thereby returns to ware 3 and is firmly pressed from both sides and establish between slider body 2 and end cover 5, in addition, returns to and is connected through other fastening screw between ware 3 and the slider body 2, and then realizes the purpose of reliably fixing.
Two reinforcing ribs 27 are fixed on the upper side surface of the inner cavity of the slider body 2 at intervals, the two reinforcing ribs 27 are integrally formed with the slider body 2, and a weight reduction groove 28 is formed between the two reinforcing ribs 27. In this structure, the setting of strengthening rib 27 is avoided here the structure too singly thin and is leaded to intensity not enough, and it has certain clearance with linear guide 1 top surface upward, and direct contact not only plays spacing effect, has so both accomplished to subtract the material and has handled and can guarantee again as far as possible that working of plastics thickness is even for reduce when plastics shaping and warp.
The upper guide rail raceway 11 and the lower guide rail raceway 12 form a 90-degree included angle, the upper guide rail raceway 11 and the upper balls 46 are matched to form a 45-degree contact angle configuration, and the lower guide rail raceway 12 and the lower balls 48 are matched to form a 45-degree contact angle configuration. Thereby realizing that the upper balls 46 and the lower balls 48 bear even loads in the up, down, left and right directions.
It should be noted that the above mentioned embodiments are only preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and the present invention may be modified in materials and structures, or replaced with technical equivalents. Therefore, structural equivalents made by using the description and drawings of the present invention or by directly or indirectly applying to other related arts are also encompassed within the scope of the present invention.
Claims (8)
1. The utility model provides a rolling linear guide is vice with integral type ball circulation retaining structure, includes linear guide, the slider body and fixes respectively the ware that turns to at slider body both ends, bilateral symmetry is provided with two upper guideway raceways and two lower guideway raceways respectively on linear guide's the both sides wall, the slider body is installed linear guide is last, its characterized in that: the ball circulation and holding device comprises an upper retainer, a middle retainer and a lower retainer, wherein an upper sliding block raceway corresponding to the upper guide rail raceway and a lower sliding block raceway corresponding to the lower guide rail raceway are symmetrically arranged in the sliding block body, the upper retainer, the middle retainer and the lower retainer are sequentially and longitudinally arranged in the sliding block body from top to bottom, an upper limiting raceway is formed between the upper retainer and the middle retainer, an upper circulation channel is formed between the upper sliding block raceway, the upper limiting raceway and two return devices, a plurality of upper balls are arranged in the upper circulation channel, a lower limiting raceway is formed between the lower retainer and the middle retainer, and a lower circulation channel is formed between the lower sliding block raceway, the lower limiting raceway and the two return devices, and a plurality of lower balls are arranged in the lower circulating channel.
2. The rolling linear guide pair with an integrated ball circulation and retaining structure as claimed in claim 1, wherein: the upper limiting roller path and the upper sliding block roller path are provided with an upper arc-shaped stop block, an upper arc-shaped roller path is arranged on the upper arc-shaped stop block, the reverser is covered and installed on the upper arc-shaped stop block, and an upper steering roller path is formed between the upper arc-shaped roller path and the reverser.
3. The rolling linear guide pair with an integrated ball circulation and retaining structure as claimed in claim 2, wherein: a lower arc-shaped stop block is arranged between the lower limiting raceway and the lower sliding block raceway, a lower arc-shaped raceway is arranged on the lower arc-shaped stop block, the reverser is arranged on the lower arc-shaped stop block in a covering mode, and a lower steering raceway is formed between the lower arc-shaped raceway and the reverser.
4. The rolling linear guide pair with an integrated ball circulation and retaining structure as claimed in claim 1, wherein: the upper retainer is provided with upper grooves distributed along the longitudinal direction, and the lower retainer is provided with lower grooves distributed along the longitudinal direction.
5. The rolling linear guide pair with an integrated ball circulation and retaining structure as claimed in claim 1, wherein: the slider is internal to be provided with upper guide pipe and the lower guide pipe of interval distribution about the symmetry, the upper guide pipe with the lower guide pipe is respectively along longitudinal fixation in the slider is internal, be formed with in the upper guide pipe the upper slide raceway, the symmetry be provided with on the lateral wall of upper guide pipe with the last clearance groove of upper slide raceway intercommunication, be formed with in the lower guide pipe the lower slide raceway, the symmetry be provided with on the lateral wall of lower guide pipe with the lower clearance groove of lower slide raceway intercommunication.
6. The rolling linear guide pair with an integrated ball circulation and retaining structure as claimed in claim 1, wherein: and a sealing end cover is arranged on the outer side of each reverser, a screw is mounted on each sealing end cover, and one end of each screw penetrates through the reverser and is fixed on the sliding block body.
7. The rolling linear guide pair with an integrated ball circulation and retaining structure as claimed in claim 1, wherein: two reinforcing ribs are fixed on the upper side surface of the inner cavity of the sliding block body at intervals, the two reinforcing ribs and the sliding block body are integrally formed, and a weight reduction groove is formed between the two reinforcing ribs.
8. The rolling linear guide pair with an integrated ball circulation and retaining structure as claimed in claim 1, wherein: the upper guide rail roller path and the lower guide rail roller path form a 90-degree included angle, the upper guide rail roller path is matched with the upper ball by a 45-degree contact angle configuration, and the lower guide rail roller path is matched with the lower ball by a 45-degree contact angle configuration.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122280659.5U CN216812527U (en) | 2021-09-18 | 2021-09-18 | Rolling linear guide rail pair with integrated ball circulation retaining structure |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122280659.5U CN216812527U (en) | 2021-09-18 | 2021-09-18 | Rolling linear guide rail pair with integrated ball circulation retaining structure |
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| CN216812527U true CN216812527U (en) | 2022-06-24 |
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| CN202122280659.5U Active CN216812527U (en) | 2021-09-18 | 2021-09-18 | Rolling linear guide rail pair with integrated ball circulation retaining structure |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116044900A (en) * | 2022-11-28 | 2023-05-02 | 广东凯特精密机械有限公司 | Rolling linear guide rail pair with ball holding part |
| CN117072557A (en) * | 2023-08-08 | 2023-11-17 | 通用技术集团机床工程研究院有限公司 | Novel self-locking normally-closed line rail sliding block and control method thereof |
-
2021
- 2021-09-18 CN CN202122280659.5U patent/CN216812527U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116044900A (en) * | 2022-11-28 | 2023-05-02 | 广东凯特精密机械有限公司 | Rolling linear guide rail pair with ball holding part |
| CN117072557A (en) * | 2023-08-08 | 2023-11-17 | 通用技术集团机床工程研究院有限公司 | Novel self-locking normally-closed line rail sliding block and control method thereof |
| CN117072557B (en) * | 2023-08-08 | 2024-02-06 | 通用技术集团机床工程研究院有限公司 | Novel self-locking normally-closed line rail sliding block and control method thereof |
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