CN221194702U - Positioning wheel device - Google Patents

Abstract

The utility model relates to the technical field of daily hardware fittings, in particular to a positioning wheel device. The second positioning wheel assembly comprises a turnover structure and a second positioning wheel, the turnover structure is turned over and arranged on the fixed seat, a second linkage structure is arranged between the second movable seat and the rotating structure, and the second movable seat drives the turnover structure to turn over relative to the fixed seat through the second linkage structure in the moving process; the second linkage structure includes a first tooth portion disposed on one and a second tooth portion or tooth slot disposed on the other and in linkage with the first tooth portion. Compared with the prior art, the utility model has the beneficial effects that the second linkage structure with the first tooth part and the second tooth part or the tooth groove drives the turnover structure to turn over, and simultaneously reduces the thickness of the whole device, and the linkage combination can realize the turnover movement in a smaller space, so that the whole height or thickness of the whole device is reduced, the positioning wheel device is more compact, and the utility model is suitable for application scenes in limited space and ultrathin door frames.

Description

Positioning wheel device

Technical Field

The utility model relates to the technical field of daily hardware fittings, in particular to a positioning wheel device.

Background

The door and window positioning wheel adjusting device is used for being arranged on a translation sliding window or a sliding door and matched with a corresponding assembled track structure to prevent the window or the sliding door from swinging or being easily lifted and separated by external force; the door and window positioning wheel adjusting device is preferably arranged at the upper end face of the translation sliding window or the sliding door.

The existing door and window positioning wheel adjusting device mainly drives the anti-swing mechanism and the jacking mechanism in sequence through the two driving mechanisms so as to prevent the window or the sliding door from swinging and prevent the window or the sliding door from falling out of the track. In the adjusting process, the anti-swing mechanism and the jacking mechanism are generally driven by threads, so that the anti-swing mechanism and the jacking mechanism have stronger stability.

But the flip structure of mechanism of toppling realizes the motion cooperation through the arc groove of side to realize the flip motion, whole cooperation structure occupation space is big, and hinders the atress big, is unfavorable for actuating mechanism's regulation. And, two actuating mechanism realize respectively that the pendulum-proof mechanism reaches the regulation of top mechanism, and the installation is complicated, and the structure is also responsible for, and manufacturing cost is high.

Disclosure of utility model

The utility model aims to solve the technical problems that the prior art has the defects, and provides a positioning wheel device which solves the problems that an ejection mechanism is abnormal in stress and large in space occupation.

The technical scheme adopted for solving the technical problems is as follows: the positioning wheel device comprises a fixed seat, a first movable seat, a second movable seat, a first positioning wheel assembly, a second positioning wheel assembly and a driving piece, wherein the first movable seat and the second movable seat are driven by the driving piece to move relative to the fixed seat; wherein,

The first positioning wheel assembly comprises a rotating structure and a first positioning wheel, the rotating structure is rotatably arranged on the fixed seat, a first linkage structure is arranged between the first movable seat and the rotating structure, and the first movable seat drives the rotating structure to rotate relative to the fixed seat through the first linkage structure in the moving process;

The second positioning wheel assembly comprises a turnover structure and a second positioning wheel, the turnover structure is turned over and arranged on the fixed seat, a second linkage structure is arranged between the second movable seat and the rotating structure, and the second movable seat drives the turnover structure to turn over relative to the fixed seat through the second linkage structure in the moving process;

the second linkage structure includes a first tooth portion disposed on one and a second tooth portion or tooth slot disposed on the other and in linkage with the first tooth portion.

Among them, the preferred scheme is: the fixing seat comprises a vertical support, the turnover structure is rotatably arranged on the vertical support, the second positioning wheel is arranged at one end of the turnover structure, the first tooth part is arranged at the other end of the turnover structure, and the second moving seat comprises a second tooth part or a tooth slot which is linked with the first tooth part.

Among them, the preferred scheme is: the vertical support sets up the upside at the fixing base, the second removes the seat setting in the downside of fixing base, the fixing base includes first mouthful of dodging, flip structure's first tooth portion passes first mouthful and second removes the seat linkage of dodging.

Among them, the preferred scheme is: the first tooth part is provided with at least one at one end of the turnover structure, and the second movable seat comprises tooth grooves which are arranged side by side with the plurality of tooth grooves.

Among them, the preferred scheme is: the first movable seat is arranged on the upper side of the fixed seat, the first movable seat comprises a second avoidance port, and the second avoidance port comprises a first avoidance area for the turnover structure to pass through and avoid, and a second avoidance area for the second positioning wheel to store and avoid.

Among them, the preferred scheme is: the first movable seat comprises an arc-shaped groove arranged on one of the movable seats and a positioning protrusion arranged on the other movable seat and linked with the arc-shaped groove.

Among them, the preferred scheme is: the first movable seat is arranged on the upper side of the fixed seat, the first positioning wheel assembly is arranged on the upper side of the first movable seat, the first movable seat comprises a third avoidance port, and the rotating shaft of the rotating structure penetrates through the third avoidance port and is arranged on the fixed seat; the two arc-shaped grooves are symmetrically arranged on the first movable seat, and the positioning protrusions are arranged on the rotating structure.

Among them, the preferred scheme is: the driving piece is a screw piece, a threaded section of the screw piece is in threaded connection with one of the first movable seat and the second movable seat, and the screw piece is also in limit setting with the other one of the first movable seat and the second movable seat so as to drive the first movable seat and the second movable seat to respectively move relative to the fixed seat in the screwing process of the screw piece.

Among them, the preferred scheme is: the first moving seat is further provided with a limit nut, the limit nut is movably and limitedly arranged in the first through hole of the first moving seat, the thread section of the screw member is in threaded connection with the limit nut, and the screw member is limitedly arranged on the second moving seat.

Among them, the preferred scheme is: the first through hole is a noncircular special-shaped hole, the limiting nut comprises a pipe sleeve and limiting parts arranged at two ends of the pipe sleeve, and the interface profile of the pipe sleeve is a noncircular special-shaped section which is in limiting matching with the noncircular special-shaped hole.

Compared with the prior art, the utility model has the beneficial effects that the second linkage structure with the first tooth part and the second tooth part or the tooth groove drives the turnover structure to turn over, and simultaneously reduces the thickness of the whole device, and the linkage combination can realize the turnover movement in a smaller space, so that the whole height or thickness of the whole device is reduced, the positioning wheel device is more compact, and the utility model is suitable for application scenes in limited space and ultrathin door frames.

Drawings

The utility model will be further described with reference to the accompanying drawings and examples, in which:

FIG. 1 is a schematic view of the positioning wheel assembly of the present utility model;

FIG. 2 is a schematic view of the structure of the first movable base of the present utility model;

FIG. 3 is a schematic view of a rotary structure according to the present utility model;

FIG. 4 is a schematic view of the structure of the bottom of the first caster assembly of the present utility model;

FIG. 5 is a schematic view of the structure of the limit fit of the fixed seat and the first movable seat of the present utility model;

FIG. 6 is a schematic diagram of the front structure of the inventive mount;

FIG. 7 is a schematic view of the reverse side structure of the inventive mount;

FIG. 8 is a schematic view of a second mobile seat according to the present utility model;

FIG. 9 is a schematic diagram of a second movable base and a turnover structure according to the present utility model;

FIG. 10 is a schematic view of the structure of the driving member of the present utility model;

FIG. 11 is a schematic view showing the structure of a first through hole of a first movable seat according to the present utility model;

FIG. 12 is a schematic view of the construction of the stop nut of the present utility model;

fig. 13 is a schematic structural view of the driving member and the second moving seat of the present utility model.

Detailed Description

Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 9, the present utility model provides a preferred embodiment of a positioning wheel device.

A positioning wheel device, which comprises a fixed seat 200, a first movable seat 100, a second movable seat 300, a first positioning wheel assembly 600, a second positioning wheel assembly 500 and a driving piece 400, wherein the first movable seat 100 and the second movable seat 300 move relative to the fixed seat 200 under the drive of the driving piece 400; the first positioning wheel assembly 600 includes a rotating structure 610 and a first positioning wheel 620, the rotating structure 610 is rotatably disposed on the fixed seat 200, a first linkage structure is disposed between the first movable seat 100 and the rotating structure 610, and the first movable seat 100 drives the rotating structure 610 to rotate relative to the fixed seat 200 through the first linkage structure during movement; the second positioning wheel assembly 500 includes a turnover structure 510 and a second positioning wheel 520, the turnover structure 510 is turned over and disposed on the fixed seat 200, a second linkage structure is disposed between the second movable seat 300 and the rotating structure 610, and the second movable seat 300 drives the turnover structure 510 to turn over relative to the fixed seat 200 through the second linkage structure during the movement process; the second linkage includes a first tooth 530 disposed on one and a second tooth or tooth slot 310 disposed on the other and in linkage with the first tooth 530.

Specifically, the first moving seat 100 and the second moving seat 300 are driven by the driving piece 400 to move relative to the fixed seat 200, the first moving seat 100 moves relative to the fixed seat 200 along the length direction of the fixed seat 200, and drives the rotating structure 610 to rotate relative to the fixed seat 200 through the first linkage structure, the first linkage structure converts the movement of the first moving seat 100 into the rotation of the rotating structure 610, the rotating structure 610 is horizontally rotated and arranged on the fixed seat 200, so as to realize the rotation of the first positioning wheel 620 around the rotation center 710, the first positioning wheels 620 are preferably arranged at two ends of the rotating structure 610, the center of the rotating structure 610 is used as the rotation center 710, so as to realize the unfolding or storage of the two first positioning wheels 620, the unfolding refers to the movement of the two first positioning wheels 620 horizontally away from the fixed seat 200, and the sliding door and window frame is relatively positioned due to the fact that the positioning wheel device is arranged on the sliding door and window frame, even if the two first positioning wheels 620 are unfolded and attached on the side surfaces of the sliding door and window frame.

The second movable seat 300 moves along the length direction of the fixed seat 200 relative to the fixed seat 200, and drives the overturning structure 510 to overturn relative to the fixed seat 200 through the second linkage structure, the second linkage structure converts the movement of the second movable seat 300 into the overturning of the overturning structure 510, the overturning structure 510 is vertically overturned on the fixed seat 200, so that the overturning of the second positioning wheel 520 around the rotation center 720 is realized, the second positioning wheel 520 is preferably arranged at the end part of the overturning structure 510, one part of the middle part of the overturning structure 510 is used as the rotation center 720, the unfolding or the storage of the second positioning wheel 520 is realized, the second positioning wheel 520 moves vertically far away from the fixed seat 200, and similarly, the second positioning wheel 520 is unfolded and can be attached on the top of the door and window frame due to the fact that the positioning wheel device is arranged on the sliding door and window, so that the vertical positioning of the sliding door and window frame is realized. The positioning wheel device can realize the side and top positioning of the sliding door and window and the door and window frame, ensure the correct alignment and positioning of the door and window, improve the stability and operability of the door and window, and make the door and window more firm and easy to use.

In this embodiment, the first tooth 530 is disposed on one of the components, such as the flip structure 510, and the second tooth or socket 310 is disposed on the other component, such as the second travel base 300. When the second moving seat 300 moves along the length direction of the fixed seat 200, the first tooth 530 is engaged with the second tooth, or the first tooth 530 is engaged with the tooth slot 310, and the two are linked to turn the turning structure 510 relative to the fixed seat 200. The second linkage structure drives the turnover structure 510 to turn over, and meanwhile, the thickness of the whole device is reduced, and the linkage combination can realize turnover movement in a smaller space, so that the whole height or thickness of the whole device is reduced, the positioning wheel device is more compact, and the positioning wheel device is suitable for application scenes in limited space and ultra-thin door frames.

As shown in fig. 6-9, the present utility model provides a preferred embodiment of a second positioning wheel assembly 500.

The fixing base 200 includes a vertical support 220, the turnover structure 510 is rotatably disposed on the vertical support 220, a rotation shaft hole 221 is provided to install the rotation shaft for rotation connection, the second positioning wheel 520 is disposed at one end of the turnover structure 510, the first tooth 530 is disposed at the other end of the turnover structure 510, and the second moving base 300 includes a second tooth or tooth slot 310 linked with the first tooth 530.

Specifically, referring to fig. 9, when the second moving seat 300 moves along the length direction of the fixed seat 200, the linkage between the second tooth portion or tooth slot 310 and the first tooth portion 530 causes the overturning structure 510 to overturn with respect to the vertical bracket 220, and the overturning motion of the overturning structure 510 enables the second positioning wheel 520 to be unfolded or stored.

Referring to fig. 6, the vertical support 220 is integrally formed with the fixing base 200, and the vertical support 220 is formed by cutting and bending on the fixing base 200, so that the vertical support 220 is easier to process, welding between the vertical support 220 and the fixing base 200 is not required, processing steps and processes are reduced, production efficiency is improved, and meanwhile, the material consumption can be reduced by integrating the vertical support 220, so that cost is saved and waste is reduced.

Wherein, the overturning structure 510 and the vertical support 220 are both flat plate structures, and are mutually attached, and are connected in a rotating way through a rotating shaft. The second positioning wheel 520 is disposed at an end of the turning structure 510, and is also rotatably connected to the turning structure 510 via a rotating shaft, and an outermost wheel of the second positioning wheel 520 protrudes from the end of the turning structure 510. The overturning structure 510 needs to overturn the second positioning wheel 520 to the highest or near position at a position near the fixing base 200, that is, the overturning structure 510 is overturned from a horizontal or near-horizontal posture to a vertical or near-vertical posture.

In this embodiment, the vertical support 220 is disposed on the upper side of the fixed seat 200, the second movable seat 300 is disposed on the lower side of the fixed seat 200, the fixed seat 200 includes a first avoiding opening 230, and the first tooth 530 of the turning structure 510 passes through the first avoiding opening 230 to be linked with the second movable seat 300. The second movable seat 300 needs to be linked with the overturning structure 510, and the linkage connection of the two needs to pass through the first avoiding opening 230, and the first avoiding opening 230 is also a notch formed by the vertical bracket 220 because the vertical bracket 220 and the fixed seat 200 are integrally arranged.

In this embodiment, at least one first tooth 530 is disposed at one end of the turnover structure 510, and the second moving seat 300 includes a plurality of tooth slots 310 disposed side by side. Preferably, the tooth slots 310 may be slots or through holes, and the tooth slots 310 arranged side by side are arranged along the length direction of the fixed slot, so that the vertical overturning plane of the overturning structure 510 is perpendicular to the length direction of the fixed slot.

The first teeth 530 may be provided to extend outward along the end face of the flip structure 510, and may be provided in one or more, if a plurality of teeth are provided at intervals. The tooth slot 310 is used to cooperate with the first tooth 530 of the turnover structure 510 to realize linkage of the two, and the first tooth 530 is inserted into the tooth slot 310 in the turnover process of the turnover structure 510 to realize the propping of the second moving seat 300 and the turnover structure 510, so that the first tooth 530 is driven to move in the process of the second moving seat 300, and the turnover of the turnover structure 510 is driven.

In this embodiment, referring to fig. 1 and fig. 2, the first moving seat 100 is disposed on the upper side of the fixed seat 200, the first moving seat 100 includes a second avoidance port 120, and the second avoidance port 120 includes a first avoidance area 121 through which the turning structure 510 passes to avoid, and a second avoidance area 122 through which the second positioning wheel 520 receives to avoid.

The design principle of the second avoidance port 120 is consistent with that of the first avoidance port 230, but since the turnover structure 510 is rotatably arranged on the fixed seat 200, the first avoidance port 230 only needs to provide an avoidance space in the turnover process of the turnover structure 510, and the first movable seat 100 moves relative to the fixed seat 200, and the second avoidance port 120 also needs to consider the movement process and avoidance of the turnover structure 510, so that a strip-shaped first avoidance area 121 needs to be arranged; meanwhile, the first positioning wheel 620 is disposed proximate to the fixing base 200 during storage, so the first moving base 100 is provided with a second avoiding area 122 for storing and avoiding the second positioning wheel 520.

Coordinated movement among the first movable seat 100, the fixed seat 200, the overturning structure 510 and the second positioning wheel 520 is realized, and when the first movable seat 100 moves relative to the fixed seat 200, the second avoidance opening 120 provides avoidance space of the overturning structure 510 and the second positioning wheel 520, so as to ensure that the second positioning wheel assembly 500 can be overturned and stored smoothly.

As shown in fig. 2-4, the present utility model provides a preferred embodiment of a first caster assembly 600.

The first movable base 100 includes an arc-shaped groove 112 provided on one, and further includes a positioning protrusion 611 provided on the other and coupled with the arc-shaped groove 112.

In this embodiment, the first movable seat 100 is disposed on the upper side of the fixed seat 200, the first positioning wheel assembly 600 is disposed on the upper side of the first movable seat 100, the first movable seat 100 includes a third avoidance opening 111, and the rotation shaft of the rotation structure 610 passes through the third avoidance opening 111 and is disposed on the fixed seat 200; the two arc-shaped grooves 112 are symmetrically arranged on the first movable seat 100, and the positioning protrusions 611 are arranged on the rotating structure 610.

Specifically, the third avoiding opening 111 is a waist-shaped hole, the first moving seat 100 does not collide with the rotating shaft of the rotating structure 610 in the moving process, a rotating space of the rotating shaft of the rotating structure 610 is provided, and the positioning protrusion 611 is driven to move along the arc-shaped groove 112 through cooperation of the arc-shaped groove 112 and the positioning protrusion 611, so that rotation of the rotating structure 610 is realized. The arc grooves 112 are symmetrically arranged at the center or one end of the waist-shaped hole, one ends of the same sides of the two arc grooves 112 are close to the waist-shaped hole, one ends of the other same sides of the arc grooves 112 are far away from the waist-shaped hole, 612 matched with the rotating shaft is arranged on the rotating structure 610, and through holes 613 are arranged to mount the first positioning wheels 620.

Further, in order to install and limit the rotation structure 610, a fixing block 800 for fixing the rotation center 710 is disposed at the bottom of the fixing base 200, and a limit block 260 is disposed at the bottom of the fixing base 200, so as to realize limit fixation.

Further, a limiting buckle 240 is disposed between the fixed seat 200 and the first movable seat 100 to limit the two and prevent the two from separating from each other.

As shown in fig. 10-13, the present utility model provides a preferred embodiment of a driver 400.

The driving member 400 is a screw member, a threaded section 420 of the screw member is in threaded connection with one of the first moving seat 100 and the second moving seat 300, and the screw member is also in limit setting with the other of the first moving seat 100 and the second moving seat 300, so as to drive the first moving seat 100 and the second moving seat 300 to respectively move relative to the fixed seat 200 in the screwing process of the screw member.

Because one is clamped on one of the first movable seat 100 and the second movable seat 300, the limit with the screw member is realized, and the screw thread section 420 of the screw member is connected with the screw thread of the other, so that the first movable seat 100 and the second movable seat 300 are mutually in principle or are close to each other in the rotating process of the screw member, and the first movable seat 100 and the second movable seat 300 are both in sliding connection with the fixed seat 200, so that the first movable seat 100 and the second movable seat 300 can move relative to the fixed seat 200.

The specific movement scheme has two:

In the first scheme, the first movable seat 100 is driven to move relative to the fixed seat 200 by rotating the screw member, so as to realize horizontal expansion of the first positioning wheel 620 of the first positioning wheel assembly 600, when the first positioning wheel 620 expands to reach the limit position, the movement of the first movable seat 100 is limited, the screw member is continuously rotated, so that the second movable seat 300 moves relative to the fixed seat 200 and moves relative to the direction of the movement direction of the first movable seat 100, and vertical expansion of the second positioning wheel 520 of the second positioning wheel assembly 500 is realized, and the second positioning wheel 520 expands to reach the limit position.

In the second aspect, relative to the first aspect, the rotation of the screw member drives the second moving seat 300 to move, and when the second moving seat 300 reaches the limit position, the first moving seat 100 is driven to move.

The screw member can simultaneously drive the first moving seat 100 and the second moving seat 300 to move and reach the limit position with respect to the first and second embodiments.

In this embodiment, the first movable seat 100 is further provided with a limiting nut 800, the limiting nut 800 is movably and limitedly disposed in the first through hole of the first movable seat 100, the threaded section 420 of the screw member is in threaded connection with the limiting nut 800, and the screw member is limitedly disposed on the second movable seat 300.

The first limit structure 430 is arranged at the nut 410 of the screw member and is matched with the second limit structure 321 of the second movable seat 300, the second limit structure 321 is arranged on the connecting seat 320 of the second movable seat 300, the limit of the screw member on the second movable seat 300 is realized, the screw member enables the nut 410 and the limit nut 800 to be close when rotating clockwise, and conversely, the nut 410 and the limit nut 800 are far away when rotating anticlockwise.

Regarding the working process of the positioning wheel device, in an initial state, the screw member starts to rotate clockwise, so that the nut 410 and the limit nut 800 approach each other, the nut 410 moves rightward under the driving of the screw member, and the limit nut 800 correspondingly moves or is stationary according to the initial position, which is achieved by the limit nut 800.

In this embodiment, the first through hole 131 is a non-circular shaped hole, as described with reference to fig. 11 and 12, the limit nut 800 includes a sleeve 820 and limit portions 810 disposed at two ends of the sleeve, the transverse cross section of the sleeve 820 has a contour of a non-circular shaped cross section that is in limit matching with the non-circular shaped hole, and an internal thread 821 that is matched with the thread section 420 is provided.

The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the utility model, but rather is intended to cover all modifications and variations within the scope of the present utility model as defined in the appended claims.

Claims (10)

1. A positioning wheel device, characterized in that: the positioning wheel device comprises a fixed seat, a first movable seat, a second movable seat, a first positioning wheel assembly, a second positioning wheel assembly and a driving piece, wherein the first movable seat and the second movable seat are driven by the driving piece to move relative to the fixed seat; wherein,

The first positioning wheel assembly comprises a rotating structure and a first positioning wheel, the rotating structure is rotatably arranged on the fixed seat, a first linkage structure is arranged between the first movable seat and the rotating structure, and the first movable seat drives the rotating structure to rotate relative to the fixed seat through the first linkage structure in the moving process;

The second positioning wheel assembly comprises a turnover structure and a second positioning wheel, the turnover structure is turned over and arranged on the fixed seat, a second linkage structure is arranged between the second movable seat and the rotating structure, and the second movable seat drives the turnover structure to turn over relative to the fixed seat through the second linkage structure in the moving process;

the second linkage structure includes a first tooth portion disposed on one and a second tooth portion or tooth slot disposed on the other and in linkage with the first tooth portion.

2. The positioning wheel device of claim 1, wherein: the fixing seat comprises a vertical support, the turnover structure is rotatably arranged on the vertical support, the second positioning wheel is arranged at one end of the turnover structure, the first tooth part is arranged at the other end of the turnover structure, and the second moving seat comprises a second tooth part or a tooth slot which is linked with the first tooth part.

3. The positioning wheel device of claim 2, wherein: the vertical support sets up the upside at the fixing base, the second removes the seat setting in the downside of fixing base, the fixing base includes first mouthful of dodging, flip structure's first tooth portion passes first mouthful and second removes the seat linkage of dodging.

4. A positioning wheel device according to any one of claims 1 to 3, wherein: the first tooth part is provided with at least one at one end of the turnover structure, and the second movable seat comprises tooth grooves which are arranged side by side with the plurality of tooth grooves.

5. A positioning wheel apparatus as defined in claim 3, wherein: the first movable seat is arranged on the upper side of the fixed seat, the first movable seat comprises a second avoidance port, and the second avoidance port comprises a first avoidance area for the turnover structure to pass through and avoid, and a second avoidance area for the second positioning wheel to store and avoid.

6. The positioning wheel device of claim 1, wherein: the first movable seat comprises an arc-shaped groove arranged on one of the movable seats and a positioning protrusion arranged on the other movable seat and linked with the arc-shaped groove.

7. The positioning wheel device of claim 6, wherein: the first movable seat is arranged on the upper side of the fixed seat, the first positioning wheel assembly is arranged on the upper side of the first movable seat, the first movable seat comprises a third avoidance port, and the rotating shaft of the rotating structure penetrates through the third avoidance port and is arranged on the fixed seat; the two arc-shaped grooves are symmetrically arranged on the first movable seat, and the positioning protrusions are arranged on the rotating structure.

8. The positioning wheel device of claim 1, wherein: the driving piece is a screw piece, a threaded section of the screw piece is in threaded connection with one of the first movable seat and the second movable seat, and the screw piece is also in limit setting with the other one of the first movable seat and the second movable seat so as to drive the first movable seat and the second movable seat to respectively move relative to the fixed seat in the screwing process of the screw piece.

9. The positioning wheel device of claim 8, wherein: the first moving seat is further provided with a limit nut, the limit nut is movably and limitedly arranged in the first through hole of the first moving seat, the thread section of the screw member is in threaded connection with the limit nut, and the screw member is limitedly arranged on the second moving seat.

10. The positioning wheel device of claim 9, wherein: the first through hole is a noncircular special-shaped hole, the limiting nut comprises a pipe sleeve and limiting parts arranged at two ends of the pipe sleeve, and the interface profile of the pipe sleeve is a noncircular special-shaped section which is in limiting matching with the noncircular special-shaped hole.