Movable track device

Abstract

The utility model belongs to the technical field of rails, and particularly discloses a movable rail device. The movable track device comprises a mounting base, a movable track and a supporting assembly, the end, deviating from the track surface of the movable track, of the movable track is hinged to the mounting base, the movable track has an unfolding state for use and a retracting state for avoiding, and the highest point of the movable track in the unfolding state is higher than the highest point of the movable track in the retracting state; the supporting assembly is provided with a first connecting part and a second connecting part, the first connecting part is connected with the movable track, the second connecting part is connected with the mounting base, when the movable track is in an unfolded state, the supporting assembly is used for supporting the movable track, and when the supporting assembly loosens the movable track, the movable track can be in a retracted state. According to the utility model, the movable track is convenient to avoid, and batch production is facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of tracks, and in particular relates to a movable track device. Background Art

[0002] A waterproof gate is a gate designed to prevent flooding caused by sudden water inrush during mining. It consists of concrete wall buttresses, door frames and openable door panels, and the gate is usually open. To ensure that the waterproof gate is closed normally, the track within the rotation range of the waterproof gate panel needs to be set as a short movable track. Because the track surface height of the movable track is higher than the lowest point of the door panel, the waterproof gate cannot be closed. Therefore, when water seepage occurs, it must be disassembled to avoid the gate and close the gate.

[0003] The movable track in the related art avoids the door panel by disassembling so that the door panel can be opened or closed normally. However, the disassembly and installation of the movable track are complicated. Summary of the invention

[0004] The utility model aims to solve one of the technical problems in the related art at least to a certain extent. To this end, the embodiment of the utility model provides a movable track device, which can make the movable track easy to avoid and facilitate mass production.

[0005] The movable track device of the embodiment of the utility model comprises: a mounting base; a movable track, wherein one end of the movable track away from its track surface is hinged to the mounting base, the movable track has an extended state for use and a retracted state for avoidance, and the highest point of the movable track in the extended state is higher than the highest point in the retracted state; a support assembly, wherein the support assembly has a first connecting part and a second connecting part, the first connecting part is connected to the movable track, and the second connecting part is connected to the mounting base, when the movable track is in the extended state, the support assembly supports the movable track, and when the support assembly releases the movable track, the movable track can be placed in the retracted state.

[0006] It should be noted that in this embodiment, the movable track and the support assembly are supported by the installation base. When the movable track needs to be used, the movable track is rotated to the unfolded state, and the movable track is supported by the support assembly, so that the movable track can be stably in the unfolded state, so that the transportation device can operate safely and reliably on the movable track. When the activity needs to be avoided, the support assembly is released from the movable track, and the movable track is rotated to put the movable track in the retracted state. At this time, the highest point of the movable track is lowered, so that avoidance can be carried out, and the movable track does not need to be disassembled, which is convenient to operate. In addition, the method of avoiding by retracting the movable track is not affected by the cross-sectional height of the chamber, and can be applied in different chambers, so that mass production can be carried out.

[0007] In this embodiment, the mounting base includes: a base body; a support body disposed on top of the base body, with the second connecting portion connected to the support body; a connecting protrusion portion disposed on one side of the support body, having a first connecting hole formed thereon, the axial direction of the first connecting hole being consistent with the length direction of the movable track; a second connecting hole coaxially disposed with the first connecting hole is formed on the movable track, and the movable track and the connecting protrusion portion are hinged by a hinge shaft passing through the first connecting hole and the second connecting hole. The movable track abuts against the support body and is rotatable relative to the support body.

[0008] In this embodiment, the base body, the support body, and the connecting protrusion portion are integrally formed.

[0009] In this embodiment, the movable track includes a track body and a plurality of connecting seats. The plurality of connecting seats are sequentially arranged at intervals along the length direction of the track body. A plurality of the connecting protrusion portions are provided, and the plurality of connecting protrusion portions are arranged at intervals along the length direction of the track body. An installation groove is formed between two adjacent connecting protrusion portions, and the connecting seats are inserted into the installation grooves in a one-to-one correspondence.

[0010] In this embodiment, the surface of the connecting seat opposite to the installation groove is a semi-circular surface, and the bottom of the installation groove is a semi-circular surface matching the connecting seat.

[0011] In this embodiment, the movable track and the support assembly connected thereto form a track group. There are two sets of the track groups, and the two sets of track groups are oppositely arranged on the mounting base.

[0012] In this embodiment, the support assembly includes: a first connecting member, with the first connecting portion disposed on the movable track, and the first connecting member forms the first connecting portion; a second connecting member disposed on the mounting base, and the second connecting member forms the second connecting portion;

[0013] a limiting member having a first connecting end and a second connecting end. The first connecting end is connected to the first connecting member and is separable from the first connecting member; the second connecting end is connected to the second connecting member and is separable from the second connecting member.

[0014] In this embodiment, the first connecting member has a first insertion hole, the second connecting member has a second insertion hole, the first connecting end of the limiting member is inserted into the first insertion hole, and the second connecting end of the limiting member is inserted into the second insertion hole.

[0015] In this embodiment, the limiting member is U-shaped, and at both ends of the limiting member in the length direction thereof, the two ends are respectively inserted into the first insertion hole and the second insertion hole.

[0016] In this embodiment, the support assembly further includes a third connecting member. A plurality of the support assemblies are provided, and the plurality of support assemblies are sequentially arranged at intervals along the length direction of the movable track. The plurality of limiting members are all connected to the third connecting member so that the third connecting member can separate or connect the plurality of limiting members together with the first connecting member and the second connecting member. Description of the Drawings

[0017] Figure 1 is a schematic structural view of the movable track device according to the embodiment of the present invention from the first perspective.

[0018] Figure 2 is a schematic structural view of the movable track device according to the embodiment of the present invention from the second perspective.

[0019] Figure 3 is a schematic structural view of the installation base according to the embodiment of the present invention from the first perspective.

[0020] Figure 4 is a schematic structural view of the installation base according to the embodiment of the present invention from the second perspective.

[0021] Figure 5 is a schematic structural view of the movable track according to the embodiment of the present invention from the first perspective.

[0022] Figure 6 is a schematic structural view of the movable track according to the embodiment of the present invention from the second perspective.

[0023] Figure 7 is a schematic structural view of the limiting member and the third connecting member according to the embodiment of the present invention.

[0024] Reference Signs:

[0025] 1. Installation base; 11. Base body; 12. Support seat body; 13. Connecting convex portion; 131. First connection hole; 14. Installation groove;

[0026] 2. Movable track; 21. Track body; 22. Connecting seat; 221. Second connection hole;

[0027] 3. Support assembly; 31. First connecting member; 32. Second connecting member; 33. Limiting member; 34. Third connecting member;

[0028] 4. Hinge shaft. Detailed Embodiments

[0029] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to be used to explain the present invention, but cannot be understood as limiting the present invention.

[0030] In this embodiment, if Figure 1 and Figure 2 As shown, the movable track device includes a mounting base 1, a movable track 2 and a support assembly 3. The end of the movable track 2 away from its track surface is hinged to the mounting base 1. The movable track 2 has an extended state for use and a retracted state for avoidance. The highest point of the movable track 2 in the extended state is higher than the highest point in the retracted state; the support assembly 3 has a first connecting portion and a second connecting portion, the first connecting portion is connected to the movable track 2, and the second connecting portion is connected to the mounting base 1. When the movable track 2 is in the extended state, the support assembly 3 supports the movable track 2. When the support assembly 3 releases the movable track 2, the movable track 2 can be put into the retracted state.

[0031] Specifically, one end of the movable track 2 is hinged to the mounting base 1, and the movable track 2 is in an extended state, which means that the movable track 2 is rotated to a vertical state, and the track surface of the movable track 2 faces upward for use. The movable track 2 is in a retracted state, which means that the movable track 2 is rotated to a horizontal state or an inclined state, so that the highest point of the movable track 2 is lower than the highest point of the extended state, so that the door panel can be avoided. Preferably, the movable track 2 is rotated to a horizontal state, at which time the highest point of the movable track 2 can be at the lowest height.

[0032] It should be noted that in this embodiment, the movable track 2 and the support assembly 3 are supported by the installation base 1. When the movable track 2 needs to be used, the movable track 2 is rotated to the unfolded state, and the movable track 2 is supported by the support assembly 3, so that the movable track 2 can be stably in the unfolded state, so that the transportation device can operate safely and reliably on the movable track 2. When the activity needs to be avoided, the support assembly 3 releases the movable track 2, and the movable track 2 is rotated to put the movable track 2 in the retracted state. At this time, the highest point of the movable track 2 is lowered, so that avoidance can be carried out, and the movable track 2 does not need to be disassembled, which is convenient to operate. In addition, the method of avoiding by retracting the movable track 2 is not affected by the cross-sectional height of the chamber, and can be applied in different chambers, so that mass production can be carried out.

[0033] In this embodiment, if Figure 1 , Figure 3 and Figure 4As shown in the figure, the mounting base 1 includes a base body 11, a support seat body 12, and a connecting convex portion 13. The support seat body 12 is arranged on the top of the base body 11, and the second connecting portion is connected to the support seat body 12. The connecting convex portion 13 is arranged on one side of the support seat body 12, and a first connecting hole 131 is arranged on the connecting convex portion 13. The axial direction of the first connecting hole 131 is consistent with the length direction of the movable track 2. A second connecting hole 221 coaxial with the first connecting hole 131 is arranged on the movable track 2. The movable track 2 and the connecting convex portion 13 are hinged by a hinge shaft 4 passing through the first connecting hole 131 and the second connecting hole 221. The movable track 2 abuts against the support seat body 12, and the movable track 2 can rotate relative to the support seat body 12.

[0034] The connecting convex portion 13 can be arranged on the base body 11, which is beneficial to making the overall strength of the mounting base 1 higher and more stable. Of course, the connecting convex portion 13 can also be arranged at intervals above the base body 11, and no limitation is made here. Further, stop members are arranged at both ends of the hinge shaft 4. By arranging the stop members, the hinge shaft 4 can be prevented from disengaging from the first connecting hole 131 and the second connecting hole 221, improving safety. For example, the stop member can be a bolt. Installation holes are arranged at both ends of the hinge shaft 4. The installation holes are arranged along the radial direction of the hinge shaft 4. The bolt passes through the installation hole and protrudes from the hinge shaft. The stop member can also be other structures, and no limitation is made here.

[0035] It can be understood that by arranging the connecting convex portion 13 on the base body 11, arranging the first connecting hole 131 on the connecting convex portion 13, arranging the second connecting hole 221 coaxial with the first connecting hole 131 on the movable track 2, and realizing the hinge connection between the connecting convex portion 13 and the movable track 2 through the hinge shaft 4 passing through the first connecting hole 131 and the second connecting hole 221, the movable track 2 can be switched between the unfolded state and the retracted state. In addition, by arranging the support seat body 12, when the movable track 2 is in the unfolded state, a certain support can be formed for the movable track 2, which is beneficial to making the movable track 2 reliably in the unfolded state and improving the stability of the movable track 2.

[0036] In this embodiment, the base body 11, the support seat body 12, and the connecting convex portion 13 are integrally formed.

[0037] For example, the base body 11, the support seat body 12, and the connecting convex portion 13 are integrally formed by machining. Of course, the base body 11, the support seat body 12, and the connecting convex portion 13 can also be integrally formed by other methods, and no limitation is made here.

[0038] It can be understood that the base body 11, the support seat body 12, and the connecting convex portion 13 are integrally formed, which is beneficial to making the overall structure stronger and reducing the processes.

[0039] In this embodiment, as Figure 2 , Figure 5 and Figure 6 shown, the movable track 2 includes a track body 21 and a plurality of connecting seats 22. The plurality of connecting seats 22 are arranged at intervals in sequence along the length direction of the track body 21. A plurality of connecting protrusion parts 13 are provided, and the plurality of connecting protrusion parts 13 are arranged at intervals along the length direction of the track body 21. An installation groove 14 is formed between two adjacent connecting protrusion parts 13, and the connecting seats 22 are inserted into the installation grooves 14 in a one-to-one correspondence.

[0040] Specifically, the length of each connecting seat 22 and the length of each installation groove 14 along the length direction of the track body 21 match each other, which facilitates inserting the connecting seat 22 into the installation groove 14. Each connecting seat 22 is provided with a second connecting hole 221, so that the hinge shaft 4 penetrates through each second connecting hole 221.

[0041] In this embodiment, by connecting the hinge shaft 4 with a plurality of connecting seats 22 and a plurality of connecting protrusion parts 13, the forces on the hinge shaft 4, the connecting seats 22 and the connecting protrusion parts 13 can be made more uniform, reducing local wear, which is beneficial to improving the connection reliability between the movable track 2 and the installation base 1.

[0042] In this embodiment, as Figure 1 shown, the surface of one side of the connecting seat 22 opposite to the installation groove 14 is a semi-circular surface, and the bottom of the installation groove 14 is a semi-circular surface matching the connecting seat 22.

[0043] It can be understood that by providing a semi-circular surface on the connecting seat 22 and making the semi-circular surface on the connecting seat 22 abut against the arc surface on the bottom of the installation groove 14, a rolling connection is formed between the connecting seat 22 and the installation base 1, thereby facilitating the rotation of the movable track 2.

[0044] In this embodiment, as Figure 1 shown, the movable track 2 and the supporting assembly 3 connected thereto form a track group. There are two sets of track groups, and the two sets of track groups are arranged oppositely on the installation base 1.

[0045] Specifically, the installation base 1 includes a base body 11. Two sets of supporting seat bodies 12 are provided on the base body 11. The two sets of supporting seat bodies 12 are arranged oppositely at intervals. One side of each supporting seat body 12 is provided with a set of connecting protrusion parts 13, and the two sets of connecting protrusion parts 13 are arranged oppositely.

[0046] It can be understood that by providing two sets of track groups, the conveying device on the movable track 2 can be stably supported. Of course, the number of track groups can be set according to actual needs, and the number of track groups does not limit the present invention.

[0047] In this embodiment, if Figure 1 and Figure 2 As shown, the support assembly 3 includes a first connecting member 31, a second connecting member 32 and a limiting member 33, the first connecting portion is arranged on the movable track 2, and the first connecting member 31 forms the first connecting portion; the second connecting member 32 is arranged on the mounting base 1, and the second connecting member 32 forms the second connecting portion; the limiting member 33 has a first connecting end and a second connecting end, the first connecting end is connected to the first connecting member 31, and the first connecting end is separable from the first connecting member 31; the second connecting end is connected to the second connecting member 32, and the second connecting end is separable from the second connecting member 32.

[0048] The first connecting member 31 can be fixedly connected to the movable track 2, such as by welding, or can be detachably connected, such as by bolting. Similarly, the second connecting member 32 can be fixedly connected to the mounting base 1, such as by welding, or can be detachably connected, such as by bolting. The connection method between the first connecting member 31 and the movable track 2 and the connection method between the second connecting member 32 and the mounting base 1 are not limited here.

[0049] It can be understood that the first connecting member 31 is arranged on the movable track 2, and the second connecting member 32 is arranged on the mounting base 1. When the movable track 2 needs to be used and the movable track 2 is rotated to the unfolded state, the first connecting end of the limiting member 33 is connected to the first connecting member 31, and the second connecting end is connected to the second connecting member 32, so that the movable track 2 can be limited by the limiting member 33 to prevent the movable track 2 from rotating, so that the movable track 2 can be kept in the unfolded state. When the movable track 2 needs to avoid, the first connecting end of the limiting member 33 is separated from the first connecting member 31, and the second connecting end of the limiting member 33 is separated from the second connecting member 32, so that the limiting member 33 cannot limit the movable track 2, so that the movable track 2 can be rotated to the retracted state.

[0050] In this embodiment, if Figure 1 and Figure 2 As shown, the first connecting member 31 has a first plugging hole, the second connecting member 32 has a second plugging hole, the first connecting end of the limiting member 33 is plugged into the first plugging hole, and the second connecting end of the limiting member 33 is plugged into the second plugging hole.

[0051] For example, the first connecting member 31 is cylindrical, and the outer wall of the first connecting member 31 can be welded to the movable track 2, and the second connecting member 32 is cylindrical, and the second connecting member 32 can be welded to the mounting base 1. Cylindrical parts are common structures, which are easy to process or purchase and help save costs.

[0052] It can be understood that when it is necessary to use the limiting member 33 to limit the movable track 2, the first connecting end of the limiting member 33 can be inserted into the first insertion hole, and the second connecting end can be inserted into the second insertion hole. When it is necessary to release the movable track 2 by the limiting member 33, the first connecting end and the second connecting end of the limiting member 33 can be respectively removed from the first insertion hole and the second insertion hole, and the operation is convenient.

[0053] In this embodiment, as Figure 2 and Figure 7 shown, the limiting member 33 is U-shaped. In the length direction of the limiting member 33, both ends of the limiting member 33 are respectively inserted into the first insertion hole and the second insertion hole.

[0054] It can be understood that by setting the limiting member 33 to be U-shaped, the two ends in the length direction of the limiting member 33 are parallel to each other, and the limiting member 33 can be inserted into the first insertion hole and the second insertion hole at the same time, which is beneficial to improving the installation efficiency of the limiting member 33 and the structure is simple. Of course, the limiting member 33 can also be set to other structures, and setting the limiting member 33 to be U-shaped does not limit the present invention.

[0055] In this embodiment, as Figure 7 shown, the support assembly 3 further includes a third connecting member 34. There are multiple support assemblies 3, and the multiple support assemblies 3 are sequentially arranged at intervals along the length direction of the movable track 2. Multiple limiting members 33 are all connected to the third connecting member 34 so as to separate or connect the multiple limiting members 33 together with the first connecting member 31 and the second connecting member 32 through the third connecting member 34.

[0056] For example, when the limiting member 33 is U-shaped, the first connecting member 31 has a first insertion hole, and the second connecting member 32 has a second insertion hole, the third connecting member 34 can be held, and when each limiting member 33 is driven by the third connecting member 34 to move to a position opposite to the corresponding first insertion hole and the second insertion hole, pushing the third connecting member 34 can connect the limiting member 33 to the corresponding first connecting member 31 and the second connecting member 32. The same is true when it is necessary to disassemble the limiting member 33, which will not be elaborated here. Specifically, the third connecting member 34 can be rod-shaped, and the third connecting member 34 can be welded to multiple limiting members 33 respectively. Of course, the structure of the third connecting member 34 and the connection method with the limiting member 33 do not limit the present invention.

[0057] It can be understood that by providing the third connecting member 34 to connect all the limiting members 33 together, the third connecting member 34 can be used to install or disassemble the multiple limiting members 33 together, which is beneficial to improving the installation and disassembly efficiency of the third connecting member 34.

[0058] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model 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 should not be construed as a limitation to the present utility model.

[0059] In addition, the terms "first" and "second" are only used for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features. In the description of the present utility model, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically and clearly defined.

[0060] In the present utility model, unless otherwise clearly specified and defined, the terms such as "mounted", "connected", "connected to", "fixed" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection, an electrical connection or communicable with each other; it may be directly connected, or indirectly connected through an intermediate medium, and may be the communication inside two elements or the interaction relationship between two elements, unless otherwise clearly defined. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0061] In the present utility model, unless otherwise clearly specified and defined, the first feature being "on" or "under" the second feature may be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on top of" the second feature may be that the first feature is directly above or obliquely above the second feature, or merely indicates that the first feature has a higher horizontal height than the second feature. The first feature being "under", "beneath" and "underneath" the second feature may be that the first feature is directly below or obliquely below the second feature, or merely indicates that the first feature has a lower horizontal height than the second feature.

[0062] In the present utility model, terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0063] Although the embodiments of the present utility model have been shown and described above, it can be understood that the above embodiments are exemplary and should not be construed as limiting the present utility model. Those of ordinary skill in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present utility model.

Claims

1. A movable track device, characterized in that: include: Install the base; A movable track, wherein one end of the movable track away from the track surface is hinged to the mounting base, the movable track has an extended state for use and a retracted state for avoidance, and the highest point of the movable track in the extended state is higher than the highest point in the retracted state; A support assembly, wherein the support assembly has a first connection portion and a second connection portion, wherein the first connection portion is connected to the movable track, and the second connection portion is connected to the mounting base. When the movable track is in the extended state, the support assembly is used to support the movable track. When the support assembly releases the movable track, the movable track can be placed in the retracted state.

2. The movable track device according to claim 1, characterized in that: The mounting base comprises: Base body; A support seat body, the support seat body is arranged on the top of the base body, and the second connecting portion is connected to the support seat body; A connecting protrusion, which is arranged on one side of the support seat body, and a first connecting hole is arranged on the connecting protrusion, and the axial direction of the first connecting hole is consistent with the length direction of the movable track; a second connecting hole is arranged on the movable track coaxially with the first connecting hole, and the movable track and the connecting protrusion are hinged by a hinge shaft passing through the first connecting hole and the second connecting hole, and the movable track abuts against the support seat body, and the movable track is rotatable relative to the support seat body.

3. The movable track device according to claim 2, characterized in that: The base body, the supporting base body and the connecting protrusion are integrally formed.

4. The movable track device according to claim 2, characterized in that: The movable track includes a track body and a plurality of connecting seats, which are arranged in sequence at intervals along the length direction of the track body. A plurality of connecting protrusions are provided, which are arranged at intervals along the length direction of the track body. An installation groove is formed between two adjacent connecting protrusions, and the connecting seats are inserted into the installation grooves one by one.

5. The movable track device according to claim 4, characterized in that: The surface of one side of the connecting seat opposite to the mounting groove is a semi-arc surface, and the bottom of the mounting groove is a semi-arc surface matching the connecting seat.

6. The movable track device according to claim 1, characterized in that: The movable track and the supporting assembly connected thereto form a track group, and two groups of the track groups are provided. The two groups of the track groups are arranged opposite to each other on the installation base.

7. The movable track device according to any one of claims 1 to 6, characterized in that: The support assembly comprises: a first connecting member, wherein the first connecting portion is disposed on the movable track, and the first connecting member forms the first connecting portion; a second connecting member, the second connecting member being disposed on the mounting base, the second connecting member forming the second connecting portion; The limiting member has a first connecting end and a second connecting end, the first connecting end is connected to the first connecting member, and the first connecting end and the first connecting member are separable; the second connecting end is connected to the second connecting member, and the second connecting end and the second connecting member are separable.

8. The movable track device according to claim 7, characterized in that: The first connecting member has a first plugging hole, the second connecting member has a second plugging hole, the first connecting end of the limiting member is plugged into the first plugging hole, and the second connecting end of the limiting member is plugged into the second plugging hole.

9. The movable track device according to claim 8, characterized in that: The limiting member is U-shaped, and in the length direction of the limiting member, two ends of the limiting member are respectively inserted into the first inserting hole and the second inserting hole.

10. The movable track device according to claim 7, characterized in that: The support assembly also includes a third connecting member, and there are multiple support assemblies. The multiple support assemblies are arranged in sequence and spaced apart along the length direction of the movable track. The multiple limiting members are all connected to the third connecting member so that the multiple limiting members can be separated or connected with the first connecting member and the second connecting member through the third connecting member.

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