A double-sided assembled composite shear wall vibration assembly

Abstract

The present invention discloses a double-sided assembled composite shear wall vibration assembly, which at least includes but is not limited to a fixed part, a pressing part, a telescopic part and a vibrating part; the telescopic part is arranged on the fixed part, and a sliding seat is provided in the telescopic part, and the sliding seat can move freely along the length direction of the fixed part; the pressing part and the sliding seat are hingedly arranged so that the pressing part can rotate freely relative to the sliding seat, and the vibrating part is connected to the telescopic part, and the telescopic part can adjust the position of the vibrating part on the wall. This solution adjusts the vibrating part to different positions on the wall through the telescopic part to achieve vibration at different heights, and at the same time, the horizontal position of the vibration can be changed through the sliding seat to achieve vibration in different areas. Through the telescopic effect of the telescopic part and the sliding effect of the sliding seat, workers can vibrate concrete in all directions on the ground; the safety of the vibration is improved, and the quality of the vibration can also be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and in particular to a double-sided assembled composite shear wall vibrating assembly. Background Art

[0002] After the prefabricated composite shear wall is installed and positioned, the hollow parts of the composite shear wall need to be filled with concrete. The vibration effect after concrete filling directly affects the strength and stiffness of the shear wall.

[0003] Currently, the more common construction process is for workers to stand on the upper part of the composite shear wall and vibrate it with a vibrating rod. On the one hand, it is inconvenient for workers to operate and there are safety hazards. On the other hand, the vibration quality is poor, which affects the vibration quality of the concrete in the hollow part of the composite shear wall, especially the vibration quality of the concrete at the bottom of the wall. Summary of the Invention

[0004] The purpose of the present invention is to provide a double-sided assembled composite shear wall vibration assembly to address the above-mentioned shortcomings, which solves the problems in the prior art where workers stand on the upper part of the composite shear wall and vibrate with a vibrating rod, resulting in safety hazards and poor vibration quality.

[0005] The present invention is achieved through the following solutions:

[0006] A double-sided assembled composite shear wall vibration assembly includes at least but not limited to a fixed part, a pressing part, a telescopic part and a vibrating part; the telescopic part is arranged on the fixed part, and a sliding seat is provided in the telescopic part, and the sliding seat can move freely along the length direction of the fixed part; the pressing part and the sliding seat are hingedly arranged so that the pressing part can rotate freely relative to the sliding seat, and the vibrating part is connected to the telescopic part, and the telescopic part can adjust the position of the vibrating part on the wall.

[0007] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibrating assembly, the fixed part includes a first limit block, a second limit block and a supporting beam; the supporting beam is provided with a plurality of guide cavities for accommodating the first limit block and the second limit block, and the guide cavity is provided with a matching hole passing through the supporting beam, and the first limit block and the second limit block are provided with locking holes matching the matching holes; the first limit block and the second limit block are connected to the supporting beam as a whole by bolts; the guide cavity is provided with a plurality of them along the width direction of the supporting beam.

[0008] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibrating assembly, the first limit block and the second limit block are both rectangular structures, and the locking holes are arranged in plurality along the length direction of the first limit block or the second limit block.

[0009] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibrating assembly, the first limit block and the second limit block constitute a limit frame, and the limit frame is provided in plurality along the length direction of the supporting beam.

[0010] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibrating assembly, the telescopic part includes a guide rail cavity, a sliding seat, a stranded wheel and a power motor; the guide rail cavity is arranged along the length direction of the supporting beam, and the sliding seat is provided with a sliding wheel that cooperates with the guide rail cavity; the stranded wheel is arranged inside the sliding seat, and the stranded wheel is rotatably connected to the sliding seat through the center shaft, and a rotating bearing is provided at the connection between the center shaft and the sliding seat; a driving tooth is provided on the output shaft of the power motor, and a driven tooth is provided on the end of the center shaft close to the output shaft, and the driving tooth is meshed with the driven tooth; the vibrating part is connected to the stranded wheel through a connecting strand.

[0011] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibrating assembly, the guide rail cavity includes a first guide rail groove and a second guide rail groove; the first guide rail groove and the second guide rail groove are symmetrically arranged along the center position of the sliding seat, and the first guide rail groove and the second guide rail groove are both provided with a receiving plate and a limiting plate; the limiting plate is arranged perpendicular to the receiving plate; the receiving plate is used to contact with the sliding wheel and receive the entire sliding seat, and the limiting plate is used to block the extreme position of the sliding wheel.

[0012] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibrating assembly, the pressure part includes a support assembly, a hinged seat, a hinged rod and a pressure rod; the support assembly is connected to the sliding seat, the hinged seat is connected to the support assembly, the hinged rod is spherically hinged to the hinged seat, and the pressure rod is arranged on the end of the hinged rod away from the hinged seat.

[0013] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibrating assembly, the support assembly includes a support plate, a connecting plate and a contact plate; one side of the support plate is connected to the side wall of the hinged seat, and the other side is connected to the side wall of the sliding seat; the connecting plate is connected to the bottom of the sliding seat, and the side wall of the connecting plate is connected to the support plate; the contact plate is an L-shaped structure as a whole, one end of the contact plate is connected to the connecting plate, and the other end is a free end; a first contact wheel is provided on the free end.

[0014] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibrating assembly, an L-shaped auxiliary support folding plate is provided on the second limit block, and a second contact wheel is provided on the end of the auxiliary support folding plate, and the second contact wheel can contact the bottom of the connecting plate.

[0015] Based on the structure of the above-mentioned double-sided assembled composite shear wall vibration assembly, the vibration part includes a vibration motor, a vibration connecting plate, an elastic support member and a limit ring; the vibration motor is connected to the vibration connecting plate, the elastic support member is arranged on the end of the vibration motor away from the vibration connecting plate, the limit ring is arranged at the end of the elastic support member, and the size of the limit ring is not less than the size of the hinged rod; a support ring is also provided on the side wall of the vibration motor, and the support ring is connected to the strand wheel through a connecting strand.

[0016] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0017] 1. When using this solution, the vibrating part is attached to the wall surface, and a little pressure is applied to the vibrating part through the pressing part to make it vibrate at a predetermined position. The vibrating part is adjusted to different positions on the wall surface through the telescopic part to achieve vibration at different heights. At the same time, the horizontal position of the vibrating part can be changed through the sliding seat to achieve vibration in different areas. The telescopic effect of the telescopic part and the sliding effect of the sliding seat enable workers to vibrate the concrete in all directions on the ground; this improves the safety of vibration and also improves the quality of vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the present invention as a whole;

[0019] Figure 2 It is an enlarged structural diagram of the vibrating part in the present invention;

[0020] Description of the drawings: 1. Fixing part; 2. Pressing part; 3. Telescopic part; 4. Vibrating part; 5. Composite shear wall; 6. Connecting rib; 11. First stopper; 12. Second stopper; 13. Support beam; 14. Guide cavity; 15. Bolt; 21. Articulated seat; 22. Articulated rod; 23. Pressing rod; 24. Support plate; 25. Connecting plate; 26. Contact plate; 27. First contact wheel; 28. Auxiliary support folding plate; 29. ​​Second contact wheel; 210 , articulated connecting rod; 31, guide rail cavity; 32, sliding seat; 33, strand wheel; 34, power motor; 35, sliding wheel; 36, center shaft; 37, rotating bearing; 38, driving tooth; 39, driven tooth; 310, connecting strand; 311, first guide rail groove; 312, second guide rail groove; 313, receiving plate; 314, limit plate; 41, vibrating motor; 42, vibrating connecting plate; 43, elastic support; 44, limit ring; 45, support ring. DETAILED DESCRIPTION

[0021] All features disclosed in this specification, or all steps in the disclosed methods or processes, except mutually exclusive features and / or steps, can be combined in any manner.

[0022] Any feature disclosed in this specification (including any appended claims and abstract), unless otherwise stated, may be replaced by other equivalent or similar features. In other words, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0023] In the description of the present invention, it should be understood that the terms "up", "down", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention.

[0024] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be understood to indicate or imply relative importance or to implicitly indicate the quantity of the technical features being referred to. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of such features.

[0025] Example 1

[0026] like Figure 1~Figure 2 As shown, the present invention provides a technical solution:

[0027] A double-sided assembled composite shear wall vibration assembly, which at least includes but is not limited to a fixed part 1, a pressing part 2, a telescopic part 3 and a vibrating part 4; the telescopic part 3 is arranged on the fixed part 1, and a sliding seat 32 is provided in the telescopic part 3, and the sliding seat 32 can move freely along the length direction of the fixed part 1; the pressing part 2 and the sliding seat 32 are hingedly arranged so that the pressing part 2 can rotate freely relative to the sliding seat 32, and the vibrating part 4 is connected to the telescopic part 3, and the telescopic part 3 can adjust the position of the vibrating part 4 on the wall.

[0028] Based on the above structure, when it is necessary to vibrate the concrete in the shear wall, the vibrating part 4 is attached to the wall surface, and a little pressure is applied to the vibrating part 4 through the pressing part 2 to make it vibrate at a predetermined position. The vibrating part 4 is adjusted to different positions on the wall surface through the telescopic part 3 to achieve vibration at different heights. At the same time, the horizontal position of the vibration can be changed through the sliding seat 32 to achieve vibration in different areas. Through the telescopic effect of the telescopic part 3 and the sliding effect of the sliding seat 32, workers can vibrate the concrete in all directions on the ground; the safety of the vibration is improved, and the quality of the vibration can also be improved.

[0029] In prefabricated buildings, wall components are typically prefabricated in a factory, such as two prefabricated shear walls 5. Multiple connecting ribs 6 are provided between the two superimposed shear walls 5. After the prefabricated wall components are assembled, concrete needs to be poured into the cavity between the two superimposed shear walls 5. Because there are many connecting ribs 6 between the two superimposed shear walls 5, conventional vibrators cannot vibrate at any position due to interference from the connecting ribs 6. Furthermore, existing vibrators cannot extend to the bottom for vibration, and workers need to reach a height to perform the vibrating operation. This not only fails to ensure construction quality and reduces construction efficiency, but also poses a safety hazard to workers.

[0030] By adopting this solution, workers can achieve comprehensive vibration on the ground. Not only can they vibrate the bottom, but they can also vibrate in any direction and position through simple sliding and pressing operations, which is safer and more efficient.

[0031] As an example, the fixing part 1 may include a first limit block 11, a second limit block 12 and a supporting beam 13; the supporting beam 13 is provided with a plurality of guide cavities 14 for accommodating the first limit block 11 and the second limit block 12, and the guide cavity 14 is provided with a matching hole passing through the supporting beam 13, and the first limit block 11 and the second limit block 12 are provided with locking holes matching the matching holes; the first limit block 11 and the second limit block 12 are connected to the supporting beam 13 as a whole by bolts 15.

[0032] A plurality of guide cavities 14 are provided along the width direction of the supporting beam 13 .

[0033] Based on the above structure, the first limit block 11 and the second limit block 12 can ensure the consistency of the positions of the matching holes and the locking holes through the guide cavity 14, which facilitates the connection of the first limit block 11 and the second limit block 12 with the supporting beam 13. At the same time, since the guide cavity 14 is provided in multiples along the width direction of the supporting beam 13, the thickness of the composite shear wall 5 can be adaptively adjusted according to the on-site measurement, so that the distance between the first limit block 11 and the second limit block 12 is roughly the same as that of the composite shear wall 5; this solution adopts an assembled structure, which can be quickly Disassembly and installation. At the same time, in this solution, the first limit block 11 and the second limit block 12 do not need to be locked with the wall by a fastening device. Instead, the cavity formed between the first limit block 11, the second limit block 12 and the supporting beam 13 is overlapped with the wall. Due to the gravity of the device itself and the supporting effect of the first limit block 11 and the second limit block 12, the cavity formed by the first limit block 11, the second limit block 12 and the supporting beam 13 can be stably placed on the top of the wall, simplifying the overall structure and being more conducive to on-site construction.

[0034] As an example, the first limit block 11 and the second limit block 12 are both rectangular in structure, and a plurality of locking holes are provided along the length direction of the first limit block 11 or the second limit block 12. The plurality of locking holes and the bolts 15 can ensure the connection strength between the first limit block 11 and the second limit block 12 and the support beam 13.

[0035] As an example, the first limit block 11 and the second limit block 12 form a limit frame, and multiple limit frames are set along the length direction of the supporting beam 13. Similarly, through multiple limit frames, the connection strength between the entire structure and the wall is ensured, thereby ensuring the supporting strength.

[0036] As an example, the telescopic part 3 may include a guide rail cavity 31, a sliding seat 32, a stranded wire wheel 33 and a power motor 34; the guide rail cavity 31 is arranged along the length direction of the supporting beam 13, and the sliding seat 32 is provided with a sliding wheel 35 that cooperates with the guide rail cavity 31; the stranded wire wheel 33 is arranged inside the sliding seat 32, and the stranded wire wheel 33 is rotatably connected to the sliding seat 32 through the center shaft 36, and a rotating bearing 37 can be provided at the connection between the center shaft 36 and the sliding seat 32; a driving tooth 38 is provided on the output shaft of the power motor 34, and a driven tooth 39 can be provided on the end of the center shaft 36 close to the output shaft, and the driving tooth 38 is engaged with the driven tooth 39; the vibrating part 4 is connected to the stranded wire wheel 33 through the connecting strand 310.

[0037] Based on the above structure, the rotation of the power motor 34 can drive the active teeth 38 to rotate, and the active teeth 38 can drive the driven teeth 39 to rotate, and finally drive the central shaft 36 and the strand wheel 33 connected to the central shaft 36 to rotate. The forward or reverse rotation of the power motor 34 can realize the extension or contraction of the stranded wire, and finally realize the adjustment of the height of the vibrating part 4.

[0038] As an example, the guide rail cavity 31 may include a first guide rail groove 311 and a second guide rail groove 312; the first guide rail groove 311 and the second guide rail groove 312 are symmetrically arranged along the center position of the sliding seat 32, and a receiving plate 313 and a limiting plate 314 are provided in the first guide rail groove 311 and the second guide rail groove 312; the limiting plate 314 is arranged perpendicular to the receiving plate 313; the receiving plate 313 is used to contact the sliding wheel 35 and receive the entire sliding seat 32, and the limiting plate 314 is used to block the extreme position of the sliding wheel 35.

[0039] Based on the above structure, the receiving plate 313 is used to contact the sliding wheel 35 and receive the entire sliding seat 32. The limiting plate 314 is used to block the extreme position of the sliding wheel 35 so that the sliding wheel 35 can only move in a predetermined direction, making the movement process of the entire sliding seat 32 safer and smoother.

[0040] As an example, the pressing part 2 may include a support assembly, an articulated seat 21, an articulated rod 22 and a pressing rod 23; the support assembly is connected to the sliding seat 32, the articulated seat 21 is connected to the support assembly, the articulated rod 22 is spherically articulated to the articulated seat 21, and the pressing rod 23 is arranged on the end of the articulated rod 22 away from the articulated seat 21.

[0041] Based on the above structure, since the support assembly is directly connected to the sliding seat 32, the support assembly and the hinged seat 21 and the cross rod connected thereto can move synchronously when the sliding seat 32 moves, which is convenient for pressing each group and is more convenient to use. Since the hinged rod 22 and the hinged seat 21 are spherically hinged, the hinged seat 21 can be rotated in all directions at will, and the pressing effect is better.

[0042] As an example, the support assembly may include a support plate 24, a connecting plate 25, and a contact plate 26; one side of the support plate 24 is connected to the side wall of the hinge seat 21, and the other side is connected to the side wall of the sliding seat 32; the connecting plate 25 is connected to the bottom of the sliding seat 32, and the side wall of the connecting plate 25 is connected to the support plate 24; the contact plate 26 is an L-shaped structure as a whole, with one end of the contact plate 26 connected to the connecting plate 25 and the other end being a free end; a first contact wheel 27 may be provided on the free end;

[0043] Based on the above structure, the support plate 24 can increase the connection area between the hinge seat 21 and the sliding seat 32, thereby increasing the supporting strength. Similarly, the support plate 24 is directly connected to the connecting plate 25, and the connecting plate 25 transmits part of the pressure generated during the pressing to the second limit block 12 through the contact plate 26. One side of the second limit block 12 contacts the wall, thereby reducing the pressure on the sliding seat 32 during the pressing, making the entire pressing part 2 more stable; since the first contact wheel 27 is provided on the free end, the entire sliding seat 32 and the support assembly can move more smoothly.

[0044] As an example, an L-shaped auxiliary support folding plate 28 may be provided on the second limiting block 12 , and a second contact wheel 29 may be provided on the end of the auxiliary support folding plate 28 , and the second contact wheel 29 can contact the bottom of the connecting plate 25 .

[0045] Based on the above structure, the connecting plate 25 can be auxiliary supported by the auxiliary support folding plate 28. When the pressing part 2 is performing the pressing operation, part of the force can be dispersed to the auxiliary support folding plate 28 to bear it, thereby ensuring the overall stability. At the same time, the second contact wheel 29 is provided to ensure that the entire pressing process is smoother.

[0046] As an example, the articulated rod 22 may include multiple articulated links 210, the first-level articulated link 210 is fixedly connected to the spherical joint, and the tail ends of the remaining articulated links 210 are all provided with threaded columns and threaded inner holes, and the articulated links 210 are connected as a whole through the threaded columns and threaded inner holes.

[0047] Based on the above structure, the hinged rod 22 is set to a multi-section structure. On the one hand, it can facilitate transportation and reduce the overall transportation volume. On the other hand, the hinged connecting rod 210 is set to a threaded connection at the end, so that the outer surface of the entire hinged rod 22 is smooth, which is convenient for cooperation with the vibrating part 4 and avoids interference between the vibrating part 4 and the telescopic part 3 when the telescopic part 3 moves.

[0048] As an example, a threaded hole is provided at the end of the pressure rod 23, and an auxiliary hole cooperating with the pressure rod 23 is provided on the side wall of the hinge rod 22, so that the pressure rod 23 and the hinge rod 22 can be detachably connected, facilitating the disassembly of the entire structure.

[0049] As an example, the vibrating part 4 may include a vibrating motor 41, a vibrating connecting plate 42, an elastic support member 43 and a limiting ring 44; the vibrating motor 41 is connected to the vibrating connecting plate 42, the elastic support member 43 is arranged on the end of the vibrating motor 41 away from the vibrating connecting plate 42, and the limiting ring 44 is arranged at the end of the elastic support member 43, and the size of the limiting ring 44 is not less than the size of the hinged rod 22.

[0050] A support ring 45 is further provided on the side wall of the vibrating motor 41 , and the support ring 45 is connected to the strand wheel 33 via a connecting strand 310 .

[0051] Based on the above structure, the overall gravity of the vibrating motor 41 is transmitted to the strand wheel 33 through the connecting strand 310. The strand wheel 33 can adjust the height of the vibrating motor 41 by rotating. At the same time, since the vibrating motor 41 will generate vibration when it is in action, the elastic support member 43 is provided to reduce the discomfort to the human body, and the vibration area can be increased by the vibrating connecting plate 42.

[0052] When using this solution, first assemble and fix the part 1 according to the thickness of the wall, and place the fixing part 1 astride the wall. Then, the power motor 34 is used to rotate the stranded wire wheel 33 and adjust the height position of the vibrating motor 41. When it reaches the predetermined position, a certain pressure is manually applied to the vibrating motor 41 through the pressure rod 23 to make the vibrating connecting plate 42 fit against the wall. The vibrating motor 41 is turned on for vibrating. When the vibration of an area is completed, the vibrating motor 41 and the pressure rod 23 can be moved by the sliding seat 32 to vibrate the next area. Through this solution, construction workers only need to stand on the ground to complete the vibration operation of the entire wall, which is safer and more efficient.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A double-sided assembled composite shear wall vibrating assembly, characterized in that: The cam is provided with a sliding seat, and the sliding seat can freely move along the length direction of the fixed part; the cam is hingedly connected to the sliding seat so that the cam can freely rotate relative to the sliding seat, and the vibrating part is connected to the telescopic part, and the telescopic part can adjust the position of the vibrating part on the wall; the fixed part includes a first limit block, a second limit block and a supporting beam; the first limit block and the second limit block are connected to the supporting beam as a whole by bolts; the cavity formed by the first limit block, the second limit block and the supporting beam The body can be stably placed on the top of the wall; the telescopic part includes a guide rail cavity, a sliding seat, a stranded wire wheel and a power motor; the guide rail cavity is arranged along the length direction of the supporting beam, and the sliding seat is provided with a sliding wheel that cooperates with the guide rail cavity; the stranded wire wheel is arranged inside the sliding seat, and the stranded wire wheel is rotatably connected to the sliding seat through a central axis, and a rotating bearing is provided at the connection between the central axis and the sliding seat; a driving tooth is provided on the output shaft of the power motor, and a driven tooth is provided on the end of the central shaft close to the output shaft, and the driving tooth is meshed with the driven tooth; the vibrating part is connected to the stranded wire wheel by connecting the stranded wire; the pressing part The cam is connected to the support member, and the cam is connected to the support member, the cam is spherically hinged to the support member, and the hinge member is provided on the end of the hinge member away from the support member; the cam is connected to the support member, and the hinge member is connected to the support member, and the hinge member is provided on the support member; the cam is connected to the support member, and the hinge member is provided on the support member; the cam is connected to the support member, and the hinge member is provided on the support member; the cam is connected to the support member, and the hinge member is provided on the support member; the cam is connected to the support member a first contact wheel; an L-shaped auxiliary support folding plate is provided on the second limit block, and a second contact wheel is provided on the end of the auxiliary support folding plate, and the second contact wheel can contact the bottom of the connecting plate; the vibrating part includes a vibrating motor, a vibrating connecting plate, an elastic support member and a limiting ring; the vibrating motor is connected to the vibrating connecting plate, the elastic support member is provided on the end of the vibrating motor away from the vibrating connecting plate, and the limiting ring is provided on the end of the elastic support member, and the size of the limiting ring is not less than the size of the hinged rod; a support ring is also provided on the side wall of the vibrating motor, and the support ring is connected to the strand wheel through a connecting strand.

2. A double-sided assembled composite shear wall vibrating assembly according to claim 1, characterized in that: The support beam is provided with a plurality of guide cavities for accommodating the first limit block and the second limit block, the guide cavities are provided with matching holes passing through the support beam, and the first limit block and the second limit block are provided with locking holes matching with the matching holes; the guide cavities are provided in a plurality along the width direction of the support beam.

3. A double-sided assembled composite shear wall vibrating assembly according to claim 2, characterized in that: The first limiting block and the second limiting block are both rectangular structures, and a plurality of locking holes are provided along the length direction of the first limiting block or the second limiting block.

4. A double-sided assembled composite shear wall vibrating assembly according to claim 3, characterized in that: The first limiting block and the second limiting block form a limiting frame, and a plurality of limiting frames are provided along the length direction of the supporting beam.

5. The double-sided assembled composite shear wall vibrating assembly according to claim 4, characterized in that: The guide rail cavity includes a first guide rail groove and a second guide rail groove; the first guide rail groove and the second guide rail groove are symmetrically arranged along the center position of the sliding seat, and a receiving plate and a limiting plate are provided in the first guide rail groove and the second guide rail groove; the limiting plate is arranged perpendicular to the receiving plate; the receiving plate is used to contact the sliding wheel and receive the entire sliding seat, and the limiting plate is used to block the extreme position of the sliding wheel.

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