Limiting mechanism

Abstract

The limiting mechanism comprises a driving assembly and a limiting assembly, the limiting assembly comprises a limiting piece and a buffering piece, the limiting piece is in transmission connection with the driving assembly, the buffering piece is connected with the limiting piece, and the driving assembly is used for driving the limiting assembly to move and enabling the limiting assembly to be positioned at different positions in the first horizontal direction; the buffering piece is provided with a buffering end used for making contact with the to-be-limited piece, the limiting piece is provided with a limiting end used for limiting the to-be-limited piece, and the buffering end is arranged in a protruding mode relative to the limiting end, so that the buffering end can slowly retreat when making contact with the to-be-limited piece, and therefore the limiting end can slowly get close to the to-be-limited piece and abut against the to-be-limited piece. Therefore, the to-be-limited part can be accurately positioned, when the to-be-limited part is a lifting mechanism used for bearing cage ribs, the cage ribs can be accurately positioned in the height direction, the end faces of the cage ribs are prevented from inclining, the production quality of the cage ribs can be improved to a great extent, and development requirements of automatic production equipment are met.

Description

Technical Field

[0001] The present application relates to the technical field of prestressed pipe pile production, and in particular to a limiting mechanism. Background Art

[0002] In the production equipment of prestressed pipe piles, the cage reinforcement rolling welding machine is a very important mechanical equipment, which is used to spirally wind the spiral reinforcement around multiple main reinforcements and weld them with multiple main reinforcements to connect them into a rigid frame (i.e., cage reinforcement), in which concrete can be further poured to form prestressed pipe piles.

[0003] Since the length of the cage reinforcement is as long as tens of meters, a pneumatic scissor-type lifting mechanism is needed to support the cage reinforcement during the cage reinforcement roll welding process in order to prevent the longer cage reinforcement from deflecting too much. However, the existing lifting mechanism cannot accurately control the lifting height, resulting in the cage reinforcement being supported at a high or low position, which causes the end face of the cage reinforcement to tilt, thus affecting the product quality. In addition, when producing cage reinforcements of different diameters on a roll welding machine, it is necessary to manually adjust the stroke of multiple scissor-type lifting mechanisms, which is prone to errors. Therefore, it is necessary to design a limit mechanism that can perform high-precision positioning to accurately position the lifting platform of the lifting mechanism at the required height. Utility Model Content

[0004] Based on this, the purpose of the present application is to provide a limiting mechanism to solve the problem that the lifting platform of the lifting mechanism cannot be accurately positioned at the required height, thereby affecting the quality of the cage reinforcement product.

[0005] According to one aspect of the present application, a limiting mechanism is provided for limiting a member to be limited in a first horizontal direction, the limiting mechanism comprising:

[0006] Mounting bracket;

[0007] A drive assembly, mounted on the mounting bracket;

[0008] A limit assembly comprises a limit piece and a buffer piece, wherein the limit piece is slidably mounted on the mounting bracket and is transmission-connected to the driving assembly, the buffer piece is connected to the limit piece, and the driving assembly is used to drive the limit piece to move and position the limit piece at different positions of the mounting bracket along the first horizontal direction; the buffer piece has a buffer end for contacting the piece to be limited, and the limit piece has a limit end for abutting against the piece to be limited to limit the piece to be limited, and the buffer end protrudes relative to the limit end on one side along the first horizontal direction; the buffer end can slowly retreat when contacting the piece to be limited, so that the limit end can slowly approach the piece to be limited and abut against the piece to be limited.

[0009] In one embodiment, the limiting mechanism also includes a transmission assembly, the transmission assembly includes a screw rod arranged along the first horizontal direction, the limiting assembly is sleeved on the screw rod, and the screw rod can rotate around its own central axis under the action of external force to drive the limiting assembly to move along the axial direction of the screw rod.

[0010] In one of the embodiments, a universal joint is installed at the end of the screw rod, and the universal joint is used to connect with the screw rod of another limiting mechanism so that the two limiting mechanisms can be connected in series.

[0011] In one embodiment, there are at least two of the limit assemblies, all of which are connected in series in sequence along the first horizontal direction through the universal joint, and the driving assembly is transmission-connected to the limit assembly at the head end.

[0012] In one of the embodiments, a dust cover is provided on the mounting bracket, and the dust cover is provided on the screw rod and can shrink or stretch along the first horizontal direction when the limiting assembly moves.

[0013] In one embodiment, the limiting member includes a mounting plate and a limiting bumper block arranged on the mounting plate, the limiting bumper block is provided with a limiting groove, and the groove wall contour of the limiting groove matches the contour of the member to be limited.

[0014] In one embodiment, there are two limit bump blocks, which are installed on both sides of the buffer component in the second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction.

[0015] In one of the embodiments, the limiting mechanism further includes a guide assembly, the guide assembly includes a guide rail arranged along the first horizontal direction and a guide block slidably connected to the guide rail, and the limiting assembly is mounted on the guide block.

[0016] In one embodiment, an origin detection sensor is provided on the mounting bracket, and a signal transmitting board is provided on the limit assembly, and the signal transmitting board is used to communicate with a control module, so that when the limit assembly drives the signal transmitting board to move along the first horizontal direction and relative to the origin detection sensor, the control module can identify the position of the limit assembly as the origin position.

[0017] In one embodiment, the driving component includes a driving source and a control module communicatively connected to the driving source, the driving source is transmission-connected to the limit component, and the control module is configured to control the driving source to drive the limit component to move from an origin position to a limit position, and can control the driving source to lock the limit component at the limit position.

[0018] The above-mentioned limiting mechanism, by arranging a driving component to be transmission-connected to a limiting member of the limiting component, enables the driving component to drive the limiting component to move along the first horizontal direction and position the limiting component at different positions of the mounting bracket along the first horizontal direction, and by arranging a buffer component in the limiting component, the buffer end is protruded relative to the limiting end of the limiting member on one side along the first horizontal direction, so that when the buffer end contacts the member to be limited, it can slowly retreat, so that the limiting end can slowly approach the member to be limited and abut against the member to be limited, so that when the limiting component moves to a certain position under the drive of the driving component, the member to be limited can be accurately moved to that position without rebounding under the joint action of the buffer component and the limiting member. In this way, when the part to be limited is a scissors-type lifting mechanism, the lifting plate of the scissors-type lifting mechanism can also stop accurately at the required height position under the limiting action of the limiting component, thereby realizing precise positioning of the material in the height direction. In this way, when the material is cage reinforcement and cage reinforcements of different diameters are placed on the lifting platform of the lifting mechanism, the lifting device can automatically adjust the height of the lifting platform, so that the central axes of cage reinforcements of different diameters can be accurately guaranteed to be at the same height, and the end face inclination of the cage reinforcement can also be avoided, thereby greatly improving the production quality of the cage reinforcement and adapting to the development needs of automated production equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 An axial view of a limiting mechanism provided in an embodiment of the present application (without a dust cover).

[0020] Figure 2 A top view of a limiting mechanism provided in one embodiment of the present application.

[0021] Figure 3 An axial view of a limiting mechanism provided in accordance with an embodiment of the present application (with a dust cover).

[0022] Figure 4 Schematic diagram of a limiting mechanism provided in an embodiment of the present application limiting the lifting mechanism Figure 1 .

[0023] Figure 5 Schematic diagram of a limiting mechanism provided in an embodiment of the present application limiting the lifting mechanism Figure 2 .

[0024] Description of reference numerals:

[0025] 10. Limiting mechanism; 11. Mounting bracket; 12. Driving assembly; 13. Limiting assembly; 131. Limiting member; 131a. Limiting end; 1311. Mounting plate; 1312. Limiting bumper; 1312a. Limiting groove; 132. Buffering member; 132a. Buffering end; 14. Transmission assembly; 15. Origin detection sensor; 16. Transmitting board; 17. Guide assembly; 18. Universal joint; 19. Dust cover; 20. Lifting mechanism; 21. Base; 22. Scissors assembly; 221. First connecting member; 222. Second connecting member; 23. Lifting platform. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0027] In the description of the present application, it should be understood that if the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. appear, the orientation or position relationship indicated by these terms is based on the orientation or position relationship shown in the accompanying drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0028] In addition, if the terms "first" or "second" appear, these terms are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, if the term "plurality" appears, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0029] In this application, unless otherwise clearly specified and limited, if the terms "installed", "connected", "connected", "fixed" and the like appear, these terms should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0030] In the present application, unless otherwise clearly specified and limited, if there is a description that a first feature is "above" or "below" a second feature, etc., or similar descriptions appear, it may mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0031] It should be noted that if an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. If an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. If any, the terms "vertical", "horizontal", "upper", "lower", "left", "right" and similar expressions used in this application are for illustrative purposes only and do not represent the only implementation method.

[0032] The present application provides a limiting mechanism for limiting a part to be limited in a first horizontal direction. The structure of the limiting mechanism in the present application is described below by taking the part to be limited as a scissor-type lifting mechanism as an example. It can be understood that in other embodiments, the limiting mechanism of the present application is not limited to limiting only the scissor-type lifting mechanism, and can also limit any part to be limited in the first horizontal direction, which is not limited here.

[0033] Figure 1 and Figure 2A limiting mechanism 10 provided in an embodiment of the present application is shown. The limiting mechanism 10 provided in the embodiment of the present application includes a mounting bracket 11, a driving component 12 and a limiting component 13, wherein the driving component 12 is fixedly mounted on the mounting bracket 11, the limiting component 13 is transmission-connected to the driving component 12 and slidably disposed on the mounting bracket 11, the driving component 12 is used to drive the limiting component 13 to move along a first horizontal direction (the first horizontal direction shown in the figure) to move the limiting component 13 to different positions of the mounting bracket 11 along the first horizontal direction, and to position the limiting component 13 at the moved position; the limiting component 13 is used to block the limiting member to be limited in the first horizontal direction.

[0034] Specifically, Figure 1 As shown, the driving component 12 is connected to the limiting component 13 through the transmission component 14. In one embodiment, the transmission component 14 includes a screw rod arranged along a first horizontal direction and connected to the driving component 12. The limiting component 13 is provided with a threaded hole, and the screw rod is passed through the threaded hole, so that the limiting component 13 can be movably mounted on the screw rod. Under the action of the driving force generated by the driving component 12, the screw rod can rotate around its own central axis to drive the limiting component 13 to move along the axial direction of the screw rod (i.e., the first horizontal direction).

[0035] In some embodiments, the driving component 12 includes a driving source and a control module that is communicatively connected to the driving source. The driving source is transmission-connected to the limit component 13. The control module is configured to control the driving source to drive the limit component 13 from an origin position to a limit position based on the size of the material, and to control the driving source to lock the limit component 13 at the limit position.

[0036] In some embodiments, the drive component 12 can be a servo motor with a brake function, the encoder and brake module of the servo motor itself are constructed as a control module, and the main body of the motor is constructed as a drive source, so that the drive component 12 can accurately drive the limit component 13 to achieve positioning and self-locking, or the drive source can be an ordinary asynchronous motor, and the control module is an external encoder and brake module, which is not limited here.

[0037] In some other embodiments, the driving component 12 may also be a pneumatic cylinder or an electric cylinder with a control module. In this case, the output end of the pneumatic cylinder or the electric cylinder is directly connected to the limit component 13, and the control module controls the pneumatic cylinder or the electric cylinder to push and pull the limit component 13 and lock the limit component 13 at the limit position.

[0038] Furthermore, combined with Figure 1 and Figure 2As shown, an origin detection sensor 15 is provided on the mounting bracket 11, and a signal transmitting board 16 is provided on the limit assembly 13. The signal transmitting board 16 is communicatively connected with the control module, so that when the limit assembly 13 drives the signal transmitting board 16 to move along the first horizontal direction and is opposite to the origin detection sensor 15, the control module can recognize that the position of the limit assembly 13 is the origin position.

[0039] Thus, just because the driving component 12 has the precise positioning function and the brake locking function, the control module of the driving component 12 can control the driving source to accurately move the limiting component 13 from the origin position to the preset limiting position according to the size of the material (for example, according to the diameter of the cage reinforcement), so that the lifting platform 23 can be accurately controlled to stop at a certain required height position, thereby accurately ensuring that the central axis of the cage reinforcements of different diameters is at the same height, thereby ensuring the production quality of the cage reinforcement; and after the material size changes, the limiting component 13 can also accurately return to the preset origin position. For example, when the driving source is a motor, the control module can give the number of rotation steps of the motor according to the diameter size of the cage reinforcement, and the rotation of the motor can drive the limiting component 13 to move to the corresponding position and lock it.

[0040] Similarly, in order to ensure smooth movement of the limit assembly 13, the limit unit also includes a guide assembly 17, which includes a guide rail arranged along the first horizontal direction and a guide block slidably connected to the guide rail. The limit assembly 13 is installed on the guide block, thereby further ensuring that the limit assembly 13 can only move along the first horizontal direction.

[0041] In some other embodiments, the limiting component 13 may be limited in the dovetail groove or the guide function may be directly realized by the cooperation between the screw rod and the limiting component 13, or the guide component 17 may be an optical axis slider mechanism, which is not particularly limited here.

[0042] Furthermore, combined with Figure 1 and Figure 3 As shown, a dust cover 19 is provided on the mounting bracket 11. The dust cover 19 covers the screw rod and can shrink or stretch along the first horizontal direction when the limit assembly 13 moves, so as to not affect the movement of the limit assembly 13, but also prevent dust from falling on the screw rod, thereby avoiding obstruction of the movement of the limit assembly 13 on the screw rod.

[0043] In order to avoid hard contact between the limiting component 13 and the part to be limited, thereby causing the part to be limited to rebound after contacting the limiting component 13, in a preferred embodiment, Figure 1 and Figure 2As shown, the limiting assembly 13 includes a limiting member 131 and a buffer member 132 connected to the limiting member 131. The buffer member 132 can be a hydraulic buffer, etc., which has a buffer end 132a for contacting the member to be limited. The limiting member 131 has a limiting end 131a for abutting against the front limiting member to limit the member to be limited. The buffer end 132a is protruding relative to the limiting end 131a on one side along the first horizontal direction.

[0044] In this way, the buffer end 132a can slowly (i.e., at a speed much lower than the moving speed of the part to be limited before contacting the buffer end 132a) retreat in the direction away from the lifting unit when contacting the part to be limited, so that the part to be limited can slowly approach the limiting end 131a and abut against the limiting end 131a. In this way, the part to be limited is prevented from making hard contact with the limiting assembly 13, thereby preventing the part to be limited from rebounding after contacting the limiting assembly 13, thereby ensuring that the part to be limited can accurately stop at the required position after contacting the limiting assembly 13.

[0045] For example Figure 4 and Figure 5 As shown, when the part to be limited is a scissor-type lifting mechanism 20, it can be seen from the figure that the scissor-type lifting mechanism 20 includes a base 21, a scissor assembly 22 and a lifting platform 23. The scissor assembly 22 includes a first connecting member 221 and a second connecting member 222 that are mutually crossed and rotatably connected. The lower end of the first connecting member 221 is hinged to the base 21, and the upper end is slidably connected to the lifting platform 23; the upper end of the second connecting member 222 is hinged to the lifting platform 23, and the lower end is slidably connected to the base 21. The lower end of the second connecting member 222 can move along the first horizontal direction on the base 21. In response to the movement of the lower end of the second connecting member 222 on the base 21, the upper end of the first connecting member 221 can slide relative to the lifting platform 23 along the first horizontal direction, and at the same time drive the lifting platform 23 to perform lifting movement. Because under the drive of the driving component 12, the limiting component 13 can move and position to different positions of the mounting bracket 11 along the first horizontal direction, so as to abut against the lower end of the second connecting member 222 at different positions of the mounting bracket 11 along the first horizontal direction, so that the lifting platform 23 can be accurately fixed at different height positions, thereby achieving precise positioning of the material in the height direction. In this way, when the material is cage reinforcement and cage reinforcements of different diameters are placed on the lifting platform 23, it can be accurately ensured that the central axes of the cage reinforcements of different diameters are at the same height.

[0046] Furthermore, if Figure 1As shown, in the structure of the limiting member 131, the limiting member 131 includes a mounting plate 1311 and a limiting bumper 1312 arranged on the mounting plate 1311, and the limiting bumper 1312 is provided with a limiting groove 1312a, and the groove wall profile of the limiting groove 1312a matches the contour of the limiting member to be limited. For example, as shown in the figure, the limiting member to be limited is a scissor-type lifting mechanism 20, and the lower end of the second connecting member 222 in the lifting mechanism 20 is a connecting shaft, so the shape of the limiting groove 1312a is correspondingly an arc shape. Of course, the groove wall profile of the limiting groove 1312a can be any shape, as long as it preferably matches the contour of the limiting member to be limited. Preferably, there are two limiting bumpers 1312, and the two limiting bumpers 1312 are installed on both sides of the buffer member 132 in the second horizontal direction (the Y direction shown in the figure) perpendicular to the first horizontal direction, so that the limiting bumper 1312 can be tightly abutted against the limiting member to be limited.

[0047] In addition, it is worth noting that when the material is of a long size, for example, when the material is a cage bar with a length of tens of meters, multiple lifting platforms 23 are required in the lifting mechanism 20 to jointly carry the cage bar to prevent the long cage bar from deflecting too much, and all lifting platforms 23 need to be located at the same height and perform lifting actions synchronously to ensure that the cage bar is always placed horizontally. Therefore, in an improved embodiment, a universal joint 18 is installed at the end of the screw rod of the transmission assembly 14, and the universal joint 18 is used to connect with the screw rod of another limiting mechanism 10, so that the two limiting mechanisms 10 can be connected in series with each other.

[0048] In this way, when there are at least two limit assemblies 13, all the limit assemblies 13 are connected in series in the first horizontal direction through the universal joint 18, and the driving assembly 12 is connected to the limit assembly 13 at the head end, so that only one driving assembly 12 is needed to drive the screw rods of all the limit mechanisms 10 to rotate together, thereby driving all the limit assemblies 13 to move the same distance together, without manually adjusting the height of the lifting platforms 23 in multiple scissor-type lifting mechanisms 20, so that the lifting platforms 23 of all scissor-type lifting mechanisms 20 can be accurately fixed at the same height. When the cage reinforcement is placed on multiple lifting platforms 23, the cage reinforcement can be placed horizontally without tilting, so that the end face of the produced cage reinforcement will not be tilted, and the production quality of the cage reinforcement can be effectively guaranteed.

[0049] It can be seen that the limiting mechanism 10 described in the present application can realize precise positioning of the limiting part in the horizontal direction. Therefore, when the limiting part is a scissors-type lifting mechanism 20, the lifting platform 23 can be positioned with high precision in the height direction, and the lifting height of the lifting platform 23 can be automatically adjusted during production change (i.e., when the material size changes). When the lifting platform 23 is used to carry cage reinforcement, the production quality of the cage reinforcement can be greatly improved to meet the development needs of automated production equipment.

[0050] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0051] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be construed as limiting the scope of the patent application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent application shall be subject to the attached claims.

Claims

1. A limiting mechanism, characterized in that: Used to limit the position of the limiting member in the first horizontal direction, the limiting mechanism includes: Mounting bracket; A drive assembly, mounted on the mounting bracket; A limit assembly comprises a limit piece and a buffer piece, wherein the limit piece is slidably mounted on the mounting bracket and is transmission-connected to the driving assembly, the buffer piece is connected to the limit piece, and the driving assembly is used to drive the limit piece to move and position the limit piece at different positions of the mounting bracket along the first horizontal direction; the buffer piece has a buffer end for contacting the piece to be limited, and the limit piece has a limit end for abutting against the piece to be limited to limit the piece to be limited, and the buffer end protrudes relative to the limit end on one side along the first horizontal direction; the buffer end can slowly retreat when contacting the piece to be limited, so that the limit end can slowly approach the piece to be limited and abut against the piece to be limited.

2. The limiting mechanism according to claim 1, characterized in that: The limiting mechanism also includes a transmission assembly, which includes a screw rod arranged along the first horizontal direction. The limiting assembly is sleeved on the screw rod. The screw rod can rotate around its own central axis under the action of external force to drive the limiting assembly to move along the axial direction of the screw rod.

3. The limiting mechanism according to claim 2, characterized in that: A universal joint is installed at the end of the screw rod, and the universal joint is used to connect with the screw rod of another limiting mechanism so that the two limiting mechanisms can be connected in series.

4. The limiting mechanism according to claim 3, characterized in that: There are at least two of the limit assemblies, all of which are connected in series in sequence along the first horizontal direction through the universal joint, and the driving assembly is transmission-connected to the limit assemblies located at the head end.

5. The limiting mechanism according to claim 2, characterized in that: The mounting bracket is provided with a dust cover, which is arranged on the screw rod and can be contracted or stretched along the first horizontal direction when the limiting assembly moves.

6. The limiting mechanism according to claim 1, characterized in that: The limiting member comprises a mounting plate and a limiting bumper block arranged on the mounting plate, the limiting bumper block is provided with a limiting groove, and the groove wall contour of the limiting groove matches the contour of the member to be limited.

7. The limiting mechanism according to claim 6, characterized in that: There are two limit bump blocks, which are installed on both sides of the buffer component in the second horizontal direction, and the second horizontal direction is perpendicular to the first horizontal direction.

8. The limiting mechanism according to claim 1, characterized in that: The limiting mechanism further comprises a guide assembly, wherein the guide assembly comprises a guide rail arranged along the first horizontal direction and a guide block slidably connected to the guide rail, and the limiting assembly is mounted on the guide block.

9. The limiting mechanism according to claim 1, characterized in that: An origin detection sensor is provided on the mounting bracket, and a signal transmitting board is provided on the limit assembly. The signal transmitting board is used to communicate with a control module, so that when the limit assembly drives the signal transmitting board to move along the first horizontal direction and is opposite to the origin detection sensor, the control module can identify the position of the limit assembly as the origin position.

10. The limiting mechanism according to claim 1, characterized in that: The driving component includes a driving source and a control module communicatively connected to the driving source. The driving source is transmission-connected to the limit component. The control module is configured to control the driving source to drive the limit component to move from an origin position to a limit position, and can control the driving source to lock the limit component at the limit position.

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