CN114541907A

CN114541907A - Positioning wheel device

Info

Publication number: CN114541907A
Application number: CN202210230943.8A
Authority: CN
Inventors: 朱倩
Original assignee: Hetuo Shenzhen Industrial Design Co ltd
Current assignee: Hetuo Shenzhen Industrial Design Co ltd
Priority date: 2022-03-09
Filing date: 2022-03-09
Publication date: 2022-05-27

Abstract

The invention relates to the technical field of daily hardware accessories, in particular to a positioning wheel device. 1. The positioning wheel device comprises a fixed seat, a first positioning wheel component, a second positioning wheel component, a limiting nut and a screw piece, wherein the first positioning wheel component comprises a first supporting plate, and the second positioning wheel component comprises a second supporting plate with a first through hole; the limiting nut is movably arranged in the first through hole in a penetrating mode and is provided with a first threaded hole; one end of the screw piece is rotatably arranged on the first supporting plate, and the threaded section of the screw piece is in threaded connection with the first threaded hole of the limiting nut. The first support plate is adjusted back through the limiting matching of the limiting nut, the first support plate at the limiting position is enabled to return a certain distance in the rotation of the screw piece, the left and right recovery of the two first positioning wheels is controlled for a certain stroke, and the reduction of the sliding capacity of the first positioning wheels due to the fact that the two first positioning wheels are unfolded left and right and are blocked with the channel is avoided.

Description

Positioning wheel device

Technical Field

The invention relates to the technical field of daily hardware accessories, in particular to a positioning wheel device.

Background

The door and window positioning wheel adjusting device is arranged on the translation sliding window or the sliding door and is matched with a correspondingly 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 upward-pushing mechanism in sequence by arranging two driving mechanisms so as to prevent a window or a sliding door from swinging and prevent the window or the sliding door from deviating from a track. In the adjusting process, the anti-swing mechanism and the jacking mechanism are driven by threads generally, and have high stability.

However, in the actual debugging process, it is found that the anti-swing mechanism is easy to generate larger pressure, that is, the sliding capability of the positioning wheel of the anti-swing mechanism is greatly influenced when the force is too large, and how to limit the unfolding stroke of the anti-swing mechanism after ensuring that the anti-swing mechanism and the jacking mechanism are installed in place is one of the problems of intensive research of researchers in the field.

Disclosure of Invention

The invention aims to solve the technical problem that the sliding capacity of a positioning wheel of an anti-swing mechanism is greatly influenced when the positioning wheel is subjected to overlarge stress.

The technical scheme adopted by the invention for solving the technical problems is as follows: the positioning wheel device comprises a fixed seat, a first positioning wheel assembly, a second positioning wheel assembly, a limiting nut and a screw piece; wherein the content of the first and second substances,

the first positioning wheel assembly comprises a first supporting plate, and the second positioning wheel assembly comprises a second supporting plate with a first through hole;

the limiting nut is movably arranged in the first through hole in a penetrating mode and provided with a first threaded hole, and the limiting nut comprises a second limiting structure so as to limit the moving stroke of the limiting nut;

one end of the screw piece is rotatably arranged on the first supporting plate, and the threaded section of the screw piece is in threaded connection with the first threaded hole of the limiting nut.

Wherein, the preferred scheme is: the first limiting structure comprises limiting parts arranged at two ends of a limiting nut.

Wherein, the preferred scheme is: and a second limiting structure is arranged between the limiting nut and the first through hole so as to limit the limiting nut to rotate relative to the first through hole.

Wherein, the preferred scheme is: the cross section of the first through hole is in a non-circular shape, the edge of the non-circular shape comprises a point A which is farthest from a central point by a distance D1 and a point B which is closest to a central store by a distance D2, the outer contour of the cross section of the limiting nut comprises a point C which is farthest from the central point by a distance D3, wherein D2< D3< D1.

Wherein, the preferred scheme is: the cross section of the first through hole is in a waist shape, the outer contour of the cross section of the limiting nut is also in a waist shape, and the size of the outer contour of the cross section of the limiting nut is close to that of the cross section of the first through hole.

Wherein, the preferred scheme is: the first resistance force generated by the movement of the first positioning wheel assembly is smaller than the second resistance force generated by the movement of the second positioning wheel assembly.

Wherein, the preferred scheme is: the first positioning wheel assembly further comprises a first sliding piece, the second positioning wheel assembly comprises a second sliding piece, the first supporting plate is arranged at one end of the first sliding piece, the second supporting plate is arranged at one end of the second sliding piece, and the first sliding piece and the second sliding piece are driven by the screw piece to move along the first direction relative to the fixed seat.

Wherein, the preferred scheme is: the fixing seat comprises a connecting seat and an adjusting seat, the connecting seat is fixedly connected with the adjusting seat and movably connected with the second sliding part, and the adjusting seat is movably connected with the first sliding part.

Wherein, the preferred scheme is: the first positioning wheel assembly further comprises a horizontal rotating plate and first positioning wheels arranged at two ends of the horizontal rotating plate, a rotating shaft is arranged on the adjusting seat, the first sliding part comprises a first waist-shaped hole matched with the rotating shaft, the length direction of the first waist-shaped hole is a first direction, and the horizontal rotating plate is rotatably connected with the rotating shaft; wherein the content of the first and second substances,

be provided with first regulation structure between first slider and the horizontal rotation board, first regulation structure is including setting up the arc pore on first slider or horizontal rotation board one to and set up on another and block the direction boss in the arc pore, the first slider along first direction motion, make the direction boss remove along the arc pore to drive horizontal rotation board and rotate for adjusting the seat.

Wherein, the preferred scheme is: the second slider is U type structure, first through-hole setting is in the bottom of U type structure, the two fork portions of U type structure are provided with the second waist type hole of mutual symmetry, second locating wheel subassembly still includes primary shaft, secondary shaft, rotation portion and second locating wheel, the primary shaft passes the two fork portions and the rotation portion setting of second slider, the secondary shaft passes the second waist type hole and the rotation portion setting of connecting seat, second slider, primary shaft and secondary shaft all set up with first direction is perpendicular, the second locating wheel rotates the one end that sets up in rotation portion.

Wherein, the preferred scheme is: the connecting seat comprises a positioning plate with a second through hole, and the screw piece penetrates through the second through hole.

The invention has the advantages that compared with the prior art, the first support plate is adjusted back through the limit matching of the limit nut, the first support plate at the limit position returns a certain distance in the rotation of the screw member, the left and right recovery of the two first positioning wheels is controlled for a certain travel, and the reduction of the sliding capacity of the first positioning wheels due to the left and right expansion of the two first positioning wheels and the blocking of the channel is avoided.

Drawings

The invention 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 invention;

FIG. 2 is a schematic view of a hidden fixing seat of the positioning wheel device of the present invention;

FIG. 3 is a schematic structural view of a stop nut of the present invention;

FIG. 4 is a schematic flow chart of the operation of the positioning wheel assembly of the present invention;

FIG. 5 is a simplified schematic view of the positioning wheel assembly of the present invention;

FIG. 6 is a simplified cross-sectional view of a spacing nut and first through-hole of the present invention;

FIG. 7 is an exploded front elevational view of the first positioning wheel assembly and adjustment block of the present invention;

FIG. 8 is a schematic view of the exploded rear face configuration of the first positioning wheel assembly and adjustment block of the present invention;

FIG. 9 is an exploded view of the second positioning wheel assembly and the anchor block of the present invention;

FIG. 10 is a schematic structural view of the fixing base of the present invention;

fig. 11 is a schematic structural view of the positioning wheel device in use.

Detailed Description

The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

As shown in fig. 1 to 6, the present invention provides a preferred embodiment of a positioning wheel device.

A positioning wheel device comprises a fixed seat 100, a first positioning wheel 201 component 200, a second positioning wheel component 300, a limiting nut 500 and a screw component 400; wherein the first positioning wheel 201 assembly 200 comprises a first supporting plate 211, and the second positioning wheel assembly 300 comprises a second supporting plate 311 having a first through hole; the limiting nut 500 is movably arranged in the first through hole in a penetrating way and is provided with a first threaded hole 530, and the limiting nut 500 is provided with a first limiting structure so as to limit the moving stroke of the limiting nut 500; one end of the screw member 400 is rotatably disposed on the first support plate 211, and the threaded section of the screw member 400 is threadedly coupled with the first threaded hole 530 of the limit nut 500.

Specifically, for convenience of description of the positioning wheel device and description of the limit nut 500, it is assumed that the first support plate 211 is disposed at the leftmost side, the second support plate 311 is disposed at the rightmost side, and the first limit structure includes limit portions disposed at both ends of the limit nut 500, which are respectively defined as a left limit portion 521 and a right limit portion 522, and a channel 510 is formed between the left limit portion 521, the right limit portion 522 and the outer side of the limit nut 500, although the specific position may be adjusted according to the product itself, and the above-mentioned orientation is only defined for convenience of description and illustration; meanwhile, for convenience of explaining the rotation of the screw member 400, it is assumed that the clockwise rotation of the screw member 400 causes the first support plate 211 and the stop nut 500 to approach each other, whereas the counterclockwise rotation causes the first support plate 211 and the stop nut 500 to move away from each other, and the above-mentioned left and right movements or standstill are all referred to the fixing base 100. Wherein, first limit structure still can be other structures, like the concave-convex structure restriction, one is provided with the recess and one is provided with the boss.

With respect to the operation of the positioning wheel device, in the initial state, the screw member 400 is rotated clockwise, referring to fig. 4B and 4C, so that the first support plate 211 and the stop nut 500 are close to each other, also for convenience of describing the actual movement state of the first support plate 211 and the stop nut 500, it is assumed that a first resistance generated by the movement of the first positioning wheel 201 assembly 200 is smaller than a second resistance generated by the movement of the second positioning wheel assembly 300, the friction force between the stop nut 500 and the second support plate 311 is negligible, that is, the first support plate 211 is moved to the right by the screw member 400, the limiting nut 500 is moved or stopped correspondingly according to the initial position, and finally the right limiting portion 522 of the limiting nut 500 is pressed against the second support plate 311, the second support plate 311 is fixed due to the resistance, so that the limit nut 500 is also fixed, and the process is carried out until the first support plate 211 is at the most limit position; continuing to rotate the screw member 400 clockwise, referring to fig. 4D, the first supporting plate 211 is fixed, and since the position of the first supporting plate 211 is unchanged, the first resistance generated by the movement of the first positioning wheel 201 assembly 200 is much greater than the second resistance generated by the movement of the second positioning wheel assembly 300, the second supporting plate 311 moves leftward under the driving of the limiting nut 500, and this process is performed until the second supporting plate 311 is at the most limit position; rotating the screw member 400 counterclockwise, referring to fig. 4E, so that the first support plate 211 and the limiting nut 500 are away from each other, when the screw member 400 is rotated counterclockwise, the pressure of the limiting nut 500 from the left side disappears at the instant of rotating the screw member 400 counterclockwise, the right limiting portion 522 of the limiting nut 500 is no longer pressed against the second support plate 311, and meanwhile, the positioning wheel corresponding to the second support plate 311 is retracted a little and is no longer tightly attached to the external structure; continuing to rotate the screw member 400 counterclockwise, referring to fig. 4E, the stop nut 500 moves from the leftmost position to the rightmost position until the left stop portion 521 of the stop nut 500 abuts against and presses against the second support plate 311; continuing to rotate the screw member 400 counterclockwise, referring to fig. F, at this time, the first resistance generated by the movement of the first positioning wheel 201 assembly 200 is smaller than the second resistance generated by the movement of the second positioning wheel assembly 300, the stop nut 500 does not move rightward any more, and the first supporting plate 211 moves leftward, until the first supporting plate 211 is at the most limit position (left side), continuing to rotate the screw member 400 clockwise, referring to fig. G, the first supporting plate 211 is fixed, and since the position of the first supporting plate 211 is unchanged, the first resistance generated by the movement of the first positioning wheel 201 assembly 200 is much larger than the second resistance generated by the movement of the second positioning wheel assembly 300, the second supporting plate 311 moves rightward under the driving of the stop nut 500, until the second supporting plate 311 is at the most limit position (right side).

Before the screw member 400 is rotated counterclockwise, the first support plate 211 and the second support plate 311 are both in the extreme positions, that is, the positioning wheel is in extreme close contact with the external structure, although the positioning wheel device is stable enough for positioning the door or window, the positioning wheel device may not slide smoothly due to too close contact. Therefore, after the screw member 400 starts to rotate counterclockwise, the right-side limiting portion 522 of the limiting nut 500 is firstly released from the second support plate 311 at the first moment, so that the positioning wheel corresponding to the second support plate 311 is changed from the tight state to the loose state, which is, of course, the actual position of the positioning wheel is not changed or is changed a little bit relative to the tight state; meanwhile, because the first supporting plate 211 starts to move leftwards, the positioning wheel corresponding to the first supporting plate 211 retracts, namely, the positioning wheel is changed into a loose state from a tight state, the positioning in the vertical direction and the horizontal direction is simultaneously released, the positioning wheel can slide more smoothly, the stability cannot be influenced, in the aspect of operation, the mounting and loosening can be realized through the screw piece 400, the structure is simple, the production efficiency is convenient to improve, and the yield is improved.

The core of the adjustment of the moving modes of the first support plate 211 and the second support plate 311 is that the second support plate 311 is firstly changed from a tight state to a loose state, then the first support plate 211 is reset, and subsequently the second support plate 311 is reset in the process of rotating the screw member 400 counterclockwise by changing the first resistance generated by the movement of the first positioning wheel 201 assembly 200 and the second resistance generated by the movement of the second positioning wheel assembly 300 through the limiting effect of the limiting nut 500 and the second support plate 311. Of course, during the actual installation process, the first support plate 211 can be returned to its original position by rotating the screw member 400 counterclockwise for a short distance.

In one embodiment, the stop nut 500 ensures smooth movement during engagement with the screw member 400, the stop nut 500 must be prevented from rotating and can only move in the first through hole, and therefore a second stop structure is disposed between the stop nut 500 and the first through hole to limit the rotation of the stop nut 500 relative to the first through hole.

There are many embodiments of the second limiting structure, for example, a mechanical second limiting structure is provided between the limiting nut 500 and the first through hole or the second supporting plate 311, or an additional part is provided between the two structures to ensure that the limiting nut 500 does not rotate and preferably does not affect the movement of the limiting nut 500, for example, the outer surface of the limiting nut 500 is provided with a groove strip, and the first through hole is provided with a protruding part extending into the groove strip.

However, it is also possible to limit by the shape of the first through hole and the limit nut 500 as the second limit structure, particularly to minimize interference with the movement of the limit nut 500, i.e., to generate frictional resistance only in the contact area therebetween. Specifically, referring to fig. 6, the cross section of the first through hole is a non-circular shape, the edge of the non-circular shape includes a point a farthest from the center point by a distance D1 and a point B closest to the center store by a distance D2, and the outer contour of the cross section of the limiting nut 500 includes a point C farthest from the center point by a distance D3, wherein D2< D3< D1. As long as the farthest distance D3 between the farthest distance D1 and the nearest distance D2 is ensured, and the center point of the non-circular shape and the center point of the cross section of the limiting nut 500 are collinear, the limiting nut 500 rotates in the first through hole, the outer contour is clamped to the edge of the non-circular shape, and the corresponding rotation cannot be continued.

Preferably, the cross section of the first through hole is in a waist shape, the outer contour of the cross section of the limit nut 500 is also in a waist shape, the size of the outer contour of the cross section of the limit nut 500 is close to that of the cross section of the first through hole, the waist shape can be a straight line on the side, an arc line is arranged on the upper side and the lower side, the waist shape is simple to manufacture and uniform in stress, damage to the first through hole or the limit nut 500 is very low, in addition, the limit nut 500 can be ensured to have enough inner area to form a second thread, and the hardness of the second thread hole can be ensured to meet requirements. Of course, other shapes are possible, such as one side being a straight line and the remaining three sides being an arc, such as an elliptical shape, e.g., a polygonal shape, etc.

As shown in fig. 1, 2, and 7-11, the present invention provides a preferred embodiment of the first positioning wheel 201 assembly 200 and the second positioning wheel assembly 300.

The first positioning wheel 201 assembly 200 further includes a first sliding member 210, the second positioning wheel assembly 300 includes a second sliding member 310, the first supporting plate 211 is disposed at one end of the first sliding member 210, the second supporting plate 311 is disposed at one end of the second sliding member 310, and both the first sliding member 210 and the second sliding member 310 are moved along a first direction relative to the fixing base 100 by the screw member 400.

Regarding the fixing base 100, the fixing base 100 includes a connecting base 110 and an adjusting base 120, the connecting base 110 is fixedly connected with the adjusting base 120 and movably connected with the second sliding member 310, and the adjusting base 120 is movably connected with the first sliding member 210. The first sliding member 210 is moved relative to the adjusting base 120 by the screw member 400, and the second sliding member 310 is moved relative to the connecting base 110 by the limit nut 500, so as to associate the first positioning wheel 201 assembly 200 with the second positioning wheel assembly 300 through the connecting base 110. Connecting seat 110 can be U type structure, not only can connect adjusting seat 120 and second slider 310 through the side, and the inside cavity that holds that forms of U type, including other structure parcel, effectively protect the locating wheel device, the overall structure's of also being convenient for installation simultaneously to, the bottom of connecting seat 110 is provided with relevant installation cooperation structure, for example the through-hole, is convenient for direct mount on the assigned position, on door and window's the corresponding position.

Wherein, adjust seat 120 also can be U type structure, and its side can be installed with connecting seat 110 cooperation, laminates each other, and stability is stronger, cooperates relevant mounting structure again and carries out fixing between them, if set up set screw etc. preferably is provided with two, improves stability. The bottom surface of adjusting seat 120 sets up upwards, sets up towards the opening of adjusting seat 120 promptly, forms the baffle structure of opening part, protects inner structure, simultaneously as the holding surface with first positioning wheel 201 subassembly 200 complex.

The connecting seat 110 includes a positioning plate 111 having a second through hole 1111, the screw member 400 passes through the second through hole 1111 to be disposed, the positioning plate 111 is disposed between the first supporting plate 211 and the second supporting plate 311, and the screw member 400 is positioned in an auxiliary manner through the second through hole 1111 of the positioning plate 111, thereby improving the hardness and the service life of the screw member 400.

Regarding the first positioning wheel 201 assembly 200, the first positioning wheel 201 assembly 200 further includes a horizontal rotating plate 220, and first positioning wheels 201 disposed at two ends of the horizontal rotating plate 220, a rotating shaft 230 is disposed on the adjusting seat 120, the first sliding member 210 includes a first kidney-shaped hole 212 matching with the rotating shaft 230, a length direction of the first kidney-shaped hole 212 is a first direction, and the horizontal rotating plate 220 is rotatably connected with the rotating shaft 230; a first adjusting structure is arranged between the first sliding part 210 and the horizontal rotating plate 220, the first adjusting structure includes an arc-shaped hole 213 arranged on one of the first sliding part 210 or the horizontal rotating plate 220, and a guiding boss 221 arranged on the other and clamped in the arc-shaped hole 213, the first sliding part 210 moves along the first direction, so that the guiding boss 221 moves along the arc-shaped hole 213, and the horizontal rotating plate 220 is driven to rotate relative to the adjusting seat 120. It is assumed that the mounting end surface of the adjusting base 120 is horizontally fixed, the first direction is the length direction of the fixing base 100, that is, the first sliding member 210 moves along the first direction, and the second direction is the direction perpendicular to the length direction and horizontally arranged, that is, the two first positioning wheels 201 move in a left-right expanding manner.

Regarding the second positioning wheel assembly 300, the second slider 310 is a U-shaped structure, the first through hole is disposed at the bottom of the U-shaped structure, the two forks of the U-shaped structure are provided with second kidney-shaped holes 311 which are symmetrical to each other, the second positioning wheel assembly 300 further includes a first shaft 340, a second shaft 330, a rotating portion 320 and a second positioning wheel, the first shaft 340 is disposed through the two forks of the second slider 310 and the rotating portion 320, the second shaft 330 is disposed through the connecting seat 110, the second kidney-shaped hole 311 of the second slider 310 and the rotating portion 320, the first shaft 340 and the second shaft 330 are both disposed perpendicular to the first direction, and the second positioning wheel is disposed at one end of the rotating portion 320.

Specifically, the rotating portion 320 is also of a U-shaped structure, a side surface of the rotating portion 320 is attached to the second slider 310, the first shaft 340 sequentially passes through two fork portions of the second slider 310 and a side through hole 321 of the rotating portion 320, and an end portion of the first shaft 340 is disposed on the second slider 310 and is not connected to the second slider 310, so that the rotating portion 320 rotates relative to the second slider 310 through the first shaft 340, and in a moving process of the second slider 310, the rotating portion 320 is driven to rotate in a vertical direction, and thus the second positioning wheel is driven to move up and down. And the second shaft 330 is sequentially arranged through the connecting seat 110, the second kidney-shaped hole 311 and the side through hole 322 of the rotating part 320, the second shaft 330 can move in the second kidney-shaped hole 311, and the rotating part 320 can be arranged in a rotating manner relative to the second shaft 330.

When the second sliding member 310 moves left and right relative to the connecting seat 110, the second shaft 330 can move in the second kidney-shaped hole 311, and certainly the second shaft 330 does not move fixedly with the connecting seat 110, but the second sliding member 310 moves to drive the second kidney-shaped hole 311 to move, so as to drive the rotating portion 320 to swing up and down.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the scope of the present invention, but rather as embodying the invention in a wide variety of equivalent variations and modifications within the scope of the appended claims.

Claims

1. A positioning wheel device is characterized in that: the positioning wheel device comprises a fixed seat, a first positioning wheel assembly, a second positioning wheel assembly, a limiting nut and a screw piece; wherein the content of the first and second substances,

2. The positioning wheel device according to claim 1, wherein: the first limiting structure comprises limiting parts arranged at two ends of a limiting nut.

3. The positioning wheel device according to claim 1, wherein: and a second limiting structure is arranged between the limiting nut and the first through hole so as to limit the limiting nut to rotate relative to the first through hole.

4. The positioning wheel device according to claim 1, wherein: the cross section of the first through hole is in a non-circular shape, the edge of the non-circular shape comprises a point A which is farthest from a central point and is at a distance D1 and a point B which is closest to a central store and is at a distance D2, the outer contour of the cross section of the limiting nut comprises a point C which is farthest from the central point and is at a distance D3, wherein D2< D3< D1.

5. The positioning wheel device according to claim 1, wherein: the cross section of the first through hole is in a waist shape, the outer contour of the cross section of the limiting nut is also in a waist shape, and the size of the outer contour of the cross section of the limiting nut is close to that of the cross section of the first through hole.

6. The positioning wheel device according to any one of claims 1 to 5, wherein: the first resistance force generated by the movement of the first positioning wheel assembly is smaller than the second resistance force generated by the movement of the second positioning wheel assembly.

7. The positioning wheel device according to claim 1, wherein: the first positioning wheel assembly further comprises a first sliding piece, the second positioning wheel assembly comprises a second sliding piece, the first supporting plate is arranged at one end of the first sliding piece, the second supporting plate is arranged at one end of the second sliding piece, and the first sliding piece and the second sliding piece are driven by the screw piece to move along the first direction relative to the fixed seat.

8. The positioning wheel device according to claim 7, wherein: the fixing seat comprises a connecting seat and an adjusting seat, the connecting seat is fixedly connected with the adjusting seat and movably connected with the second sliding part, and the adjusting seat is movably connected with the first sliding part.

9. The positioning wheel device according to claim 8, wherein: the first positioning wheel assembly further comprises a horizontal rotating plate and first positioning wheels arranged at two ends of the horizontal rotating plate, a rotating shaft is arranged on the adjusting seat, the first sliding part comprises a first waist-shaped hole matched with the rotating shaft, the length direction of the first waist-shaped hole is a first direction, and the horizontal rotating plate is rotatably connected with the rotating shaft; wherein, the first and the second end of the pipe are connected with each other,

be provided with first regulation structure between first slider and the horizontal rotating plate, first regulation structure is including setting up the arc pore on first slider or horizontal rotating plate one to and set up on another and block the direction boss in the arc pore, the first direction motion of edge of first slider makes the direction boss remove along the arc pore to drive horizontal rotating plate and rotate for adjusting the seat.

10. The positioning wheel device according to claim 8, wherein: the second slider is U type structure, first through-hole setting is in the bottom of U type structure, the two fork portions of U type structure are provided with the second waist type hole of mutual symmetry, second locating wheel subassembly still includes primary shaft, secondary shaft, rotation portion and second locating wheel, the primary shaft passes the two fork portions and the rotation portion setting of second slider, the secondary shaft passes the second waist type hole and the rotation portion setting of connecting seat, second slider, primary shaft and secondary shaft all set up with first direction is perpendicular, the second locating wheel rotates the one end that sets up in rotation portion.

11. The positioning wheel device according to claim 8, wherein: the connecting seat comprises a positioning plate with a second through hole, and the screw piece penetrates through the second through hole.