Fixing and limiting device

Abstract

The utility model provides a fixing and limiting device, and relates to the technical field of mechanical axle auxiliary assembly, the fixing and limiting device provided by the utility model comprises a supporting and fixing structure and a limiting structure, the supporting and fixing structure is provided with an inserting hole used for inserting an axle and locking the position of the axle relative to the supporting and fixing structure; the limiting structure is installed on the supporting and fixing structure, the limiting structure has a first locking state for locking the position of the limiting structure relative to the supporting and fixing structure and a first unlocking state for moving relative to the supporting and fixing structure in the direction gradually close to or away from the axis of the inserting hole, and the limiting structure is provided with limiting teeth; the limiting teeth are used for entering and exiting between any two adjacent teeth of the belt wheel in the first unlocking state. The fixing and limiting device provided by the utility model is convenient for personnel to exert force, has low requirements on assembly personnel, is not easy to cause the problem that the belt wheel is not firmly assembled due to fatigue of the personnel, improves the assembly efficiency, and ensures the installation qualification rate.

Description

Technical Field

[0001] The utility model relates to the technical field of mechanical wheel axle auxiliary assembly, in particular to a fixed limiting device. Background Art

[0002] In the robot slide, the XY motion platform module consists of X and Y motion components, driving wheel components and driven wheel components. For the driving wheel component, the driving wheel shaft and the tension pulley have the following inconveniences during on-site assembly:

[0003] During assembly, the driving wheel shaft and the tensioning pulley need to be fixed at the same time to make relative movement. The on-site operator needs to hold the edge of the pulley with one hand to fix it, and tighten the pulley tensioning screw with the other hand. This method has high requirements on the assembler himself and requires the cooperation of both hands. When tightening the pulley tensioning screw, it is easy for the pulley and the shaft tensioning device to be not tightened enough due to fatigue, which reduces the assembly efficiency and easily causes poor installation. Utility Model Content

[0004] The purpose of the utility model is to provide a fixed limit device, which is convenient for personnel to use force, has low requirements on the assemblers themselves, is not easy to cause the problem of insufficient tightening of the pulley and the shaft tensioning device due to personnel fatigue, improves assembly efficiency, and ensures the qualified rate of installation.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] The utility model provides a fixed limiting device, comprising a supporting fixed structure and a limiting structure, wherein:

[0007] The supporting and fixing structure has an insertion hole for inserting the wheel axle and locking the position of the wheel axle relative to the supporting and fixing structure;

[0008] The limiting structure is installed on the supporting and fixing structure. The limiting structure has a first locking state that locks itself relative to the supporting and fixing structure and a first unlocking state that moves relative to the supporting and fixing structure in a direction gradually approaching or moving away from the axis of the insertion hole. The limiting structure has limiting teeth, and the limiting teeth are used to enter and exit between any two adjacent teeth of the pulley in the first unlocking state.

[0009] Further, the supporting and fixing structure includes a base assembly and a supporting block mounted on the base assembly;

[0010] The limiting structure comprises a limiting member and a locking assembly, wherein the limiting member is mounted on the supporting block and has the limiting teeth, and one of the limiting member and the supporting block is provided with a first waist-shaped hole, and the extension direction of the first waist-shaped hole is arranged along the radial direction of the insertion hole; the locking assembly is installed between the limiting member and the supporting block, and the locking assembly is slidably connected in the first waist-shaped hole;

[0011] When the limiting structure is in the first locking state, the locking assembly presses the limiting member against the supporting and fixing structure;

[0012] When the limiting structure is in the first unlocking state, the locking assembly releases the compression between the limiting member and the supporting and fixing structure.

[0013] Furthermore, there are two limit members, which are distributed up and down along the height direction of the support block, and each limit member is connected to the support block via one locking assembly.

[0014] Furthermore, the other of the limiting member and the supporting block is provided with a second waist-shaped hole perpendicular to the first waist-shaped hole. When the limiting structure is in the first locking state, the locking assembly passes through the first waist-shaped hole and the second waist-shaped hole and presses the limiting member against the supporting block.

[0015] Furthermore, the support block is movably mounted on the base assembly, and the support block has a second locking state in which it locks its position relative to the base assembly and a second unlocking state in which it moves relative to the base assembly in a direction gradually approaching or moving away from the axis of the insertion hole.

[0016] Furthermore, one of the base assembly and the support block is provided with a third waist-shaped hole perpendicular to the axis of the insertion hole; a locking member is installed between the support block and the base assembly, and the locking member is slidably connected in the third waist-shaped hole;

[0017] When the support block is in the second locking state, the locking member presses the support block against the base assembly;

[0018] When the support block is in the second unlocked state, the locking member releases the compression between the support block and the base assembly.

[0019] Furthermore, the base assembly includes a base body and a fixing seat, the fixing seat is detachably configured on the base body, and the fixing seat has the insertion hole.

[0020] Furthermore, the fixing seat includes a clamping block and a fastener, the clamping block has the insertion hole and an adjustment gap connected to the side of the insertion hole, the fastener is connected to the clamping block and passes through the adjustment gap, and the fastener is used to adjust the size of the adjustment gap.

[0021] Further, the base body comprises a bottom support block and a plurality of limit blocks, the bottom support block is mounted with the support block, each of the limit blocks is detachably connected to the bottom support block and forms a mounting cavity with the bottom support block;

[0022] The fixing seat is plug-fitted with the installation cavity, and / or the fixing seat is detachably connected to the bottom support block via a connecting piece.

[0023] Furthermore, the number of the limiting blocks is three, and the three limiting blocks are all connected to the side walls of the bottom support block, and form the installation cavity having a top opening and a side opening between the three limiting blocks and the bottom support block.

[0024] The fixed limit device provided by the utility model can produce the following beneficial effects:

[0025] When the above-mentioned fixed limiting device is working, the pulley is first sleeved on the axle. At this time, the axial position of the pulley relative to the axle is adjustable; then the axle is inserted into the insertion hole of the supporting fixed structure, the position of the axle relative to the supporting fixed structure is locked, and the pulley falls on the supporting fixed structure under the action of gravity; then, the limiting structure is adjusted to the first unlocking state, and the limiting structure is moved in a direction gradually approaching the axis of the insertion hole until the limiting tooth enters between any two adjacent teeth of the pulley, limiting the rotation of the pulley; then the limiting structure is adjusted to the first locking state; finally, the tensioning screw on the pulley tensioning bushing is tightened to achieve the connection between the pulley and the axle.

[0026] Compared with the prior art, the fixed limiting device provided by the utility model can not only fix the wheel axle, but also limit the rotation of the pulley on the wheel axle through the limiting structure. When assembling the pulley, there is no need for personnel to grasp the edge of the pulley to fix it. Both hands can be used to tighten the pulley tensioning screws, which is convenient for personnel to exert force and has low requirements on the assemblers themselves. It is not easy to cause the problem of insufficient tightening of the pulley assembly due to personnel fatigue, which improves the assembly efficiency, ensures the installation qualification rate, and is suitable for the assembly of pulleys of different diameters. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 An exploded view of a fixed limiting device provided in an embodiment of the utility model;

[0029] Figure 2 A schematic diagram of a three-dimensional structure of a position limiting member provided in an embodiment of the utility model;

[0030] Figure 3 A schematic diagram of a three-dimensional structure of a support block provided in an embodiment of the utility model;

[0031] Figure 4 A schematic diagram of a three-dimensional structure of a clamping block provided in an embodiment of the utility model;

[0032] Figure 5 A schematic diagram of a three-dimensional structure of a bottom support block provided in an embodiment of the utility model;

[0033] Figure 6 A schematic diagram of the three-dimensional structure of a limit block provided in an embodiment of the utility model.

[0034] Icons: 1-support and fixing structure; 11-support block; 111-second waist-shaped hole; 12-locking piece; 13-base body; 131-bottom support block; 1311-third waist-shaped hole; 132-limiting block; 133-installation cavity; 14-fixed seat; 141-clamping block; 1411-insertion hole; 1412-adjusting gap; 2-limiting structure; 21-limiting piece; 211-limiting tooth; 212-first waist-shaped hole; 22-locking assembly. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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 orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] The specific implementation of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the present invention, and is not used to limit the present invention.

[0039] The first aspect of the present invention provides a fixed limit device. Figure 1 As shown, it includes a supporting and fixing structure 1 and a limiting structure 2, wherein:

[0040] The supporting and fixing structure 1 has an inserting hole 1411 for inserting the wheel axle and locking the position of the wheel axle relative to the supporting and fixing structure 1;

[0041] The limiting structure 2 is installed on the supporting and fixing structure 1. The limiting structure 2 has a first locking state that locks its own position relative to the supporting and fixing structure 1 and a first unlocking state that moves relative to the supporting and fixing structure 1 in a direction gradually approaching or moving away from the axis of the insertion hole 1411. The limiting structure 2 has a limiting tooth 211, and the limiting tooth 211 is used to enter and exit between any two adjacent teeth of the pulley in the first unlocking state.

[0042] When in use, the pulley can be firstly sleeved on the axle, at this time, the axial position of the pulley relative to the axle is adjustable; then, one end of the axle is inserted into the insertion hole 1411 of the supporting and fixing structure 1, the insertion hole 1411 locks the position of the axle relative to the supporting and fixing structure 1, and the pulley falls on the supporting and fixing structure 1 under the action of gravity; then, the limiting structure 2 is adjusted to the first unlocking state, and the limiting structure 2 is moved in a direction gradually approaching the axis of the insertion hole 1411 until the limiting tooth 211 enters between any two adjacent teeth of the pulley, and the limiting tooth 211 limits the rotation of the pulley relative to the axle; then, the limiting structure 2 is adjusted to the first locking state; finally, the tensioning screw on the pulley tensioning bushing is tightened to realize the connection between the pulley and the axle.

[0043] Of course, the limiting teeth 211 may not be provided, and the rotation of the pulley may be restricted by only the contact between the limiting structure 2 and the pulley.

[0044] After installation, the limiting structure 2 can be adjusted to the first unlocked state, so that the limiting structure 2 moves in a direction gradually away from the axis of the insertion hole 1411, and then the assembled axle and pulley can be removed.

[0045] The device provided in the above embodiment can not only fix the wheel axle, but also limit the rotation of the pulley. During assembly, there is no need for personnel to grasp the edge of the pulley to fix the pulley. Both hands of the assembler can be used to tighten the pulley tensioning screw, which makes it easier for personnel to exert force, improves assembly efficiency, and ensures the installation qualification rate.

[0046] At the same time, since the limiting structure 2 can move in a direction gradually approaching the axis of the insertion hole 1411 and can also move in a direction gradually away from the axis of the insertion hole 1411, the above device can assemble pulleys of different diameters.

[0047] The structure of the limiting structure 2 is specifically described below:

[0048] It should be noted that there can be many ways to connect the limiting structure 2 and the supporting and fixing structure 1, any way that can enable the limiting structure 2 to switch between the above-mentioned first locking state and the above-mentioned second locking state is acceptable, for example: a guide structure that cooperates with a slide rail and a slide groove is provided between the limiting structure 2 and the supporting and fixing structure 1, the slide groove is provided with multiple slots along its own length direction, and the slide rail is provided with a block that can be inserted into any one of the slots; or one of the limiting structure 2 and the supporting and fixing structure 1 is provided with a waist-shaped groove, and the other is provided with a connecting hole, and the screw can pass through the waist-shaped groove and the connecting hole and lock or release the relative position of the two through a nut.

[0049] In an optional embodiment, if Figure 1As shown, the supporting and fixing structure 1 includes a base assembly and a supporting block 11 installed on the base assembly; the limiting structure 2 includes a limiting member 21 and a locking assembly 22, the limiting member 21 is installed on the supporting block 11 and has a limiting tooth 211.

[0050] One of the limit member 21 and the support block 11 is provided with a first waist-shaped hole 212, and the extension direction of the first waist-shaped hole 212 is arranged along the radial direction of the insertion hole 1411; a locking assembly 22 is installed between the limit member 21 and the support block 11, and the locking assembly 22 is slidably connected in the first waist-shaped hole 212.

[0051] It is understandable that if Figure 1 As shown, the axis of the insertion hole 1411 extends in the vertical direction, and the first waist-shaped hole 212 extends in the horizontal direction perpendicular to the vertical direction.

[0052] When the limiting structure 2 is in the first locking state, the locking assembly 22 passes through the first waist-shaped hole 212 and the support block 11 and presses the limiting member 21 against the support block 11, locking the position of the limiting member 21 relative to the support block 11; when the limiting structure 2 is in the first unlocking state, the locking assembly 22 releases the pressure between the limiting member 21 and the support block 11, and the limiting member 21 can move relative to the support block 11.

[0053] Among them, the locking assembly 22 can include a screw and a nut. The screw passes through the first waist-shaped hole 212 and the support block 11 and is tightened by the nut, so that the limiting structure 2 is in the first locking state. Loosening the nut can put the limiting structure 2 in the first unlocking state.

[0054] Of course, the locking assembly 22 is not limited to the above structure, and the locking assembly 22 may also only use screws or pins.

[0055] In an optional embodiment, if Figure 2 As shown, the limiting member 21 is a limiting plate, a first waist-shaped hole 212 is opened in the length direction of the limiting plate, and a limiting tooth 211 is provided at one end of the limiting plate in the length direction.

[0056] The limiting member 21 can be configured as one, or can be configured as two, three or more, and the number thereof can be selected according to the pulleys that need to be installed on the axle.

[0057] In an optional embodiment, there are two limit members 21, which are distributed up and down along the height direction of the support block 11. Each limit member 21 is connected to the support block 11 through a locking assembly 22, and each locking assembly 22 can adjust the locking state of each limit member 21 relative to the support block 11.

[0058] When in use, if two pulleys need to be installed on the axle, the first installed pulley can be circumferentially limited by the lower limiting member 21. After the first pulley is installed, the second installed pulley can be circumferentially limited by the upper limiting member 21. When the second pulley is installed, the second pulley can be placed on the first pulley to achieve axial limitation of the second pulley.

[0059] In an optional embodiment, if Figure 1 and Figure 3 As shown, one of the limiting member 21 and the supporting block 11 that does not have the first waist-shaped hole 212 is provided with a second waist-shaped hole 111, and the second waist-shaped hole 111 is perpendicular to the first waist-shaped hole 212 and parallel to the axis of the insertion hole 1411. When the limiting structure 2 is in the first locking state, the locking assembly 22 passes through the first waist-shaped hole 212 and the second waist-shaped hole 111 and presses the limiting member 21 against the supporting block 11.

[0060] The setting of the second waist-shaped hole 111 enables the height of the limiting structure 2 to be adjustable when the limiting structure 2 is in the first unlocked state. When different pulleys are installed, the limiting member 21 in the limiting structure 2 can adjust its own height according to the thickness of the different pulleys, thereby realizing circumferential limitation of pulleys of different sizes.

[0061] In an optional embodiment, when the limiting member 21 is provided with a first waist-shaped hole 212 , the supporting block 11 is provided with a second waist-shaped hole 111 .

[0062] When there are multiple limit members 21, a second waist-shaped hole 111 can be configured on the support block 11, and the locking components 22 corresponding to each limit member 21 pass through this second waist-shaped hole 111; the support block 11 can also be configured with the same number of second waist-shaped holes 111 as the limit members 21, and the locking components 22 corresponding to each limit member 21 pass through different second waist-shaped holes 111.

[0063] The base assembly and the support block 11 may be of an integrated structure or a split structure. Figure 1 As shown, the support block 11 is movably mounted on the base assembly, and the support block 11 has a second locking state in which it locks its position relative to the base assembly and a second unlocking state in which it moves relative to the base assembly in a direction gradually approaching or moving away from the axis of the insertion hole 1411.

[0064] With respect to the integrated structure of the base assembly and the support block 11, in the above embodiment, the support block 11 is movably mounted on the base assembly, and when in use, the support block 11 has a second unlocked state in which it moves relative to the base assembly in a direction gradually approaching or moving away from the axis of the insertion hole 1411. In this state, the limiting structure 2 as a whole can follow the movement of the support block 11.

[0065] The movement direction of the support block 11 can be parallel to the extension direction of the first waist-shaped hole 212, or can be perpendicular to the extension direction of the first waist-shaped hole 212. Figure 1 When in use, the support block 11 can drive the limiting structure 2 thereon to move as a whole closer to the axis of the insertion hole 1411, and can roughly adjust the position of the limiting member 21. If the movement direction of the support block 11 is perpendicular to the extension direction of the first waist-shaped hole 212, when in use, the support block 11 can drive the limiting structure 2 thereon to adjust the centering of the tooth end of the limiting tooth 211 and the axis of the insertion hole 1411, so that the tooth end of the limiting tooth 211 can be aligned with the axis of the insertion hole 1411, making it easier for the limiting tooth 211 to be inserted between any two adjacent teeth of the pulley.

[0066] Preferably, the movement direction of the support block 11 is parallel to the extension direction of the first waist-shaped hole 212 .

[0067] There may be various ways to connect the base assembly and the support block 11 , and for details, reference may be made to the way to connect the limiting structure 2 and the support block 11 .

[0068] In an optional embodiment, if Figure 1 and Figure 3 As shown, one of the base assembly and the support block 11 is provided with a third waist-shaped hole 1311 perpendicular to the axis of the insertion hole 1411 , and a locking member 12 is installed between the support block 11 and the base assembly, and the locking member 12 is slidably connected in the third waist-shaped hole 1311 .

[0069] It is understandable that if Figure 1 As shown, the axis of the insertion hole 1411 extends in the vertical direction, and the third waist-shaped hole 1311 extends in the horizontal direction perpendicular to the vertical direction.

[0070] Preferably, the extension direction of the third waist-shaped hole 1311 is parallel to the first waist-shaped hole 212 .

[0071] In an optional embodiment, if Figure 1 As shown, the base assembly is provided with a third waist-shaped hole 1311. When the support block 11 is in the second locked state, the locking member 12 passes through the third waist-shaped hole 1311 and is inserted into the support block 11 to press the support block 11 against the base assembly and lock the position of the support block 11 relative to the base assembly; when the support block 11 is in the second unlocked state, the locking member 12 releases the compression between the support block 11 and the base assembly, and the support block 11 can move relative to the base assembly.

[0072] The locking member 12 may be a screw or a pin.

[0073] When the locking member 12 is a screw, a threaded hole is formed on the surface of the supporting block 11 facing the base assembly.

[0074] In an optional embodiment, if Figure 1 As shown, the base assembly includes a base body 13 and a fixing base 14 . The fixing base 14 is detachably disposed on the base body 13 , and the fixing base 14 has an insertion hole 1411 .

[0075] In the above-mentioned base assembly, since the fixing seat 14 in the base assembly is detachably configured on the base body 13, when assembling different types of driving axles, the user can replace different fixing seats 14 so that the insertion holes 1411 on different fixing seats 14 can adapt to different types of driving axles.

[0076] In an optional embodiment, if Figure 4 As shown, the fixing seat 14 includes a clamping block 141 and a fastener. The clamping block 141 has an insertion hole 1411 and an adjustment gap 1412 connected to the side of the insertion hole 1411 . The fastener is connected to the clamping block 141 and passes through the adjustment gap 1412 .

[0077] When in use, the fastener can adjust the size of the adjustment gap 1412 to allow the insertion hole 1411 to clamp the axle or release the axle.

[0078] In an optional embodiment, the installation cavity 133 is a semi-enclosed cavity, and the two adjustment ends of the fixing seat 14 forming the adjustment gap 1412 protrude from the installation cavity 133, so that it is convenient for the user to tighten and loosen the fastener. The aperture of the insertion hole 1411 on the clamping block 141 can be only slightly larger than the outer diameter of the axle, so that after the axle is inserted into the insertion hole 1411, the fastener only needs to slightly reduce the adjustment gap 1412 to make the insertion hole 1411 clamp the axle, so that the shape of the clamping block 141 will basically not change, and the clamping block 141 can be placed in the installation cavity 133 more stably.

[0079] In an optional embodiment, if Figure 1 , Figure 5 and Figure 6 As shown, the base body 13 includes a bottom support block 131 and a plurality of limit blocks 132; the bottom support block 131 is installed with a support block 11, and when the base assembly is provided with a third waist-shaped hole 1311, the third waist-shaped hole 1311 is provided on the bottom support block 131; each limit block 132 is detachably connected to the bottom support block 131 and forms an installation cavity 133 with the bottom support block 131, and the installation cavity 133 can limit the fixing seat 14 to ensure the stability of the position of the fixing seat 14 relative to the base body 13 during use.

[0080] The fixing seat 14 is plug-fitted with the installation cavity 133 , and / or the fixing seat 14 is detachably connected to the bottom support block 131 via a connector.

[0081] by Figure 1 For example, the fixing seat 14 is plugged into the installation cavity 133 , and the user can adapt the fixing seats 14 of different sizes by replacing the limiting blocks 132 of different styles.

[0082] In order to enable the installation cavity 133 to more firmly limit the position of the clamping block 141, or to adapt to clamping blocks 141 of different sizes, each limit block 132 can be connected to the bottom support block 131 by screws. By screwing the screws into the bottom support block 131 to different depths, each limit block 132 can limit or even clamp the bottom support blocks 131 of different sizes.

[0083] It should be noted that, when in use, each limit block 132 does not necessarily clamp the clamping block 141 , and only needs to limit the clamping block 141 from swinging after the user tightens the pulley tensioning screw.

[0084] The installation cavity 133 may be a fully enclosed cavity, enclosing all side walls of the fixing seat 14, or ... Figure 1 The semi-enclosed cavity is shown, which surrounds part of the side wall of the fixing seat 14 .

[0085] In an optional embodiment, there are three limit blocks 132, all of which are connected to the side walls of the bottom support block 131, and form a semi-enclosed installation cavity 133 with a top opening and a side opening between the limit blocks 132 and the bottom support block 131. The top opening facilitates the insertion of the clamping block 141, and the side opening facilitates the clamping block 141 to form two adjustment ends of the adjustment gap 1412 protruding from the installation cavity 133.

[0086] Specifically, each limit block 132 may be provided with two or more through holes for connecting members such as screws and pins to pass through.

[0087] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A fixed limit device, characterized in that: It comprises a supporting and fixing structure (1) and a limiting structure (2), wherein: The supporting and fixing structure (1) has an insertion hole (1411) for inserting a wheel axle and locking the position of the wheel axle relative to the supporting and fixing structure (1); The limiting structure (2) is mounted on the supporting and fixing structure (1), and the limiting structure (2) has a first locking state in which the limiting structure (2) is locked relative to the supporting and fixing structure (1), and a first unlocking state in which the limiting structure (2) is movable relative to the supporting and fixing structure (1) in a direction gradually approaching or moving away from the axis of the insertion hole (1411), and the limiting structure (2) has a limiting tooth (211), and the limiting tooth (211) is used to enter and exit between any two adjacent teeth of the pulley in the first unlocking state.

2. The fixed limiting device according to claim 1, characterized in that: The supporting and fixing structure (1) comprises a base assembly and a supporting block (11) mounted on the base assembly; The limiting structure (2) comprises a limiting member (21) and a locking assembly (22); the limiting member (21) is mounted on the supporting block (11) and has the limiting teeth (211); one of the limiting member (21) and the supporting block (11) is provided with a first waist-shaped hole (212); the extension direction of the first waist-shaped hole (212) is arranged along the radial direction of the insertion hole (1411); the locking assembly (22) is installed between the limiting member (21) and the supporting block (11), and the locking assembly (22) is slidably connected in the first waist-shaped hole (212); When the limiting structure (2) is in a first locking state, the locking assembly (22) presses the limiting member (21) against the supporting and fixing structure (1); When the limiting structure (2) is in the first unlocking state, the locking assembly (22) releases the compression between the limiting member (21) and the supporting fixing structure (1).

3. The fixed limiting device according to claim 2, characterized in that: The limiting members (21) are configured in two, and the two limiting members (21) are distributed up and down along the height direction of the support block (11), and each limiting member (21) is connected to the support block (11) via one locking assembly (22).

4. The fixed limiting device according to claim 2, characterized in that: The other of the limiting member (21) and the supporting block (11) is provided with a second waist-shaped hole (111) perpendicular to the first waist-shaped hole (212); when the limiting structure (2) is in a first locking state, the locking assembly (22) passes through the first waist-shaped hole (212) and the second waist-shaped hole (111) and presses the limiting member (21) against the supporting block (11).

5. The fixed limiting device according to claim 2, characterized in that: The support block (11) is movably mounted on the base assembly, and the support block (11) has a second locking state in which the support block (11) locks its position relative to the base assembly, and a second unlocking state in which the support block (11) moves relative to the base assembly in a direction gradually approaching or moving away from the axis of the insertion hole (1411).

6. The fixed limiting device according to claim 5, characterized in that: One of the base assembly and the support block (11) is provided with a third waist-shaped hole (1311) perpendicular to the axis of the insertion hole (1411); a locking member (12) is installed between the support block (11) and the base assembly, and the locking member (12) is slidably connected in the third waist-shaped hole (1311); When the support block (11) is in a second locking state, the locking member (12) presses the support block (11) against the base assembly; When the support block (11) is in a second unlocked state, the locking member (12) releases the compression between the support block (11) and the base assembly.

7. The fixed limiting device according to claim 2, characterized in that: The base assembly comprises a base body (13) and a fixing seat (14); the fixing seat (14) is detachably arranged on the base body (13), and the fixing seat (14) has the insertion hole (1411).

8. The fixed limiting device according to claim 7, characterized in that: The fixing seat (14) comprises a clamping block (141) and a fastener, wherein the clamping block (141) has the insertion hole (1411) and an adjustment gap (1412) connected to the side of the insertion hole (1411), and the fastener is connected to the clamping block (141) and passes through the adjustment gap (1412), and the fastener is used to adjust the size of the adjustment gap (1412).

9. The fixed limiting device according to claim 7, characterized in that: The base body (13) comprises a bottom support block (131) and a plurality of limit blocks (132); the bottom support block (131) is mounted with the support block (11); each of the limit blocks (132) is detachably connected to the bottom support block (131) and forms a mounting cavity (133) with the bottom support block (131); The fixing seat (14) is plug-fitted with the installation cavity (133), and / or the fixing seat (14) is detachably connected to the bottom support block (131) via a connecting piece.

10. The fixed limiting device according to claim 9, characterized in that: The limit blocks (132) are configured in three numbers, and the three limit blocks (132) are all connected to the side wall of the bottom support block (131), and form the installation cavity (133) having a top opening and a side opening between the limit blocks and the bottom support block (131).

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