CN111576994A - A tent stand that is easy to fold - Google Patents

Abstract

The invention discloses a tent support which is easy to fold, comprising a multi-angle top mold base, a main support and a support frame; the multi-angle top mold base includes an upper mold base and a lower mold base, the upper mold base includes an upper hinge seat, a lower mold base The lower hinge seat of the die base; the main support includes a main connecting rod, a first connecting component and a sleeve rod. The main connecting rod is a hollow structure, one end of which is hinged on the upper hinge seat and the lower hinge seat respectively, and the other end is installed with a first connecting component. , one end of the sleeve rod is inserted into the main connecting rod, and the sleeve rod and the main connecting rod are detachably connected through the first connecting assembly; the support frame includes a frame rod, a second connecting assembly and a support rod, and one end of the frame rod is connected with the sleeve rod Hinged, the frame rod and the support rod are locked/unlocked through a second connecting piece, and the unlocked support rod can be retracted into the frame rod. The invention realizes the diversification of tent shape unfolding, and the unfolding or folding operation of the tent is more convenient and labor-saving, and the volume of the folded tent is smaller, which is convenient for storage.

Description

A tent stand that is easy to fold

technical field

The invention relates to the technical field of outdoor products, in particular to a tent support that is easy to fold.

Background technique

The folding tent has the advantages of easy assembly, convenient carrying, and simple folding, and is welcomed by users. It has become one of the necessary leisure products commonly used in the outdoors. The folding tent is mainly composed of tent cloth and tent brackets for supporting the tent cloth. Generally, it is composed of multiple sets of support rods and top modules. Each set of support rods is hinged on the top module respectively. Each set of support rods is connected by multiple rods and hinges. Each rod can be connected to the hinge. It can be flipped on the top to realize the folding of the tent.

Since only a fixed number of rods can be hinged on the existing tent top module, the shape of the tent cloth is fixed by the bracket, that is, after the bracket opens the tent cloth, only one type of tent can be erected, and the tent can be unfolded in a single form. It is impossible to adjust the different shapes of the tent according to the actual use requirements, which reduces the user's experience and thus limits the market promotion scope of the product.

At the same time, in order to increase the width or height of the tent, longer rods or multiple short rods are used to spliced into long rods, which will make the operation inconvenient and labor-saving when the rods are flipped to unfold or fold. The volume of the folded tent is relatively large, and it is inconvenient to store the folded tent.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a tent support that is easy to fold, not only can adjust the different shapes of the tent according to actual use requirements, but also can make the unfolding or folding operation of the tent more convenient and labor-saving, and the volume of the tent after folding is smaller. , for easy storage.

To achieve the above object, the present invention adopts the following technical solutions:

A tent support that is easy to fold, comprising a multi-angle top mold base, a main support and a support frame;

The multi-angle top mold seat includes an upper mold seat and a lower mold seat located below the upper mold seat, the upper mold seat includes a plurality of upper hinge seats arranged along its circumferential direction, and the lower mold seat includes a number of a lower hinge seat arranged along its circumference;

The main support includes a main link, a first connecting component and a sleeve rod. The main link is a hollow structure, one end of which is hinged on the upper hinge seat and the lower hinge seat, and the other end is installed with the first hinge. a connecting assembly, one end of the sleeve rod is inserted into the main connecting rod, and the sleeve rod and the main connecting rod are detachably connected through the first connecting assembly;

The support frame includes a frame rod, a second connecting component and a support rod, one end of the frame rod is hinged with the sleeve rod, and the frame rod and the support rod are locked/unlocked through the second connecting piece , and the unlocked support rod can be retracted into the frame rod.

Preferably, the second connection assembly includes a second connection seat and a second switch; the second connection seat is provided with a second connection hole with a hollow structure, and both sides of the second connection hole are provided with third connections The other end of the frame rod is inserted into the second connection hole, the upper ends of the third connection hole are respectively hinged with the support rods, and the two support rods are in the same shape as the frame rods after they are unfolded. Inverted Y shape; the second connection seat is provided with a second installation port that communicates with the second connection hole, the lower end of the frame rod is provided with a first socket port, and the second switch is provided in the The second installation port can be mated with the first insertion port.

Preferably, the second installation port is provided with a second plug port, the second plug port communicates with the second connection hole, the second switch includes a switch body and a plug, and the switch body has the same shape as The shape of the second installation port is adapted, the switch body extends to one side to form the plug, and the plug is mated with the second plug port.

Preferably, the number of the upper hinge seats is at least two, the number of the lower hinge seats is not less than the number of the upper hinge seats, the end of the main bracket is provided with a first hinge, the first hinge A hinge is connected with the upper hinge seat, the first hinge is connected with a second hinge, and the second hinge is connected with the lower hinge seat.

Preferably, the first connection assembly includes a first connection seat and a first switch; the first connection seat is provided with a first connection hole with a hollow structure, and the main link is inserted in the first connection hole , the first connection seat is provided with a first installation port that communicates with the first connection hole; the first switch is provided in the first installation port, and the sleeve rod is inserted in the first connection hole And in the main link, the sleeve rod and the first connecting seat are detachably connected through the first switch.

Preferably, the first connection assembly further comprises a spring, the spring is arranged between the first connection seat and the first switch, the first switch is in a ring structure, and the inner wall of the first switch is toward the first switch. A clamping block is formed extending in the center direction, a bayonet is provided on the sleeve rod, and the first switch causes the clamping block to be clamped into the bayonet under the action of a spring.

Preferably, the outer wall of the first switch is provided with a groove in the direction of the blocking block, the first connecting seat is protruded to form a convex column in the direction facing the groove, and the spring is sleeved on the on the protruding post and accommodated in the groove.

Preferably, the size of the first switch is adapted to the size of the first installation opening, the first installation opening protrudes toward its middle to form a first limit portion, and the first switch is provided with a limit The first limiting part is adapted to the limiting groove; the end of the sleeve rod is provided with a limiting piece, the first connecting seat is provided with a second limiting part, and the main link and the limiting member are respectively abutted on the second limiting portion.

Preferably, the structure of the second connecting assembly is the same as that of the first connecting assembly, the number of the support rod is one, and the support rod is locked with the frame rod through the second connecting piece /unlock.

Preferably, the cross-sectional shapes of the main connecting rod, the sleeve rod, the frame rod and the support rod are non-circular, the shape of the hollow structure of the main connecting rod is adapted to the cross-sectional shape of the sleeve rod, and the second connection The shape of the hole is adapted to the cross-sectional shape of the pole.

After adopting the above-mentioned technical scheme, the present invention has the following advantages compared with the background technology:

1. In the present invention, the user can select a multi-angle top mold seat with different numbers of upper hinge seats and lower hinge seats according to actual use requirements, so that the upper hinge seat of the upper mold seat and the lower hinge seat of the lower mold seat can be connected to all The required number of main connecting rods make the tents have various shapes to meet the different needs of users, improve the user's experience, and facilitate the market promotion of the product.

2. In the present invention, one end of the sleeve rod is inserted into the main connecting rod, and is detachably connected through the first connecting assembly. After the first connecting assembly releases the connection and fixing between the main connecting rod and the sleeve rod, the sleeve rod can be received into the main connecting rod. in the rod, so that the sleeve rod is overlapped into the main link; in the present invention, the frame rod and the support rod are locked/unlocked through the second connecting piece, and the unlocked support rod can be retracted into the frame rod, so that the The support rod is folded and overlapped to the frame rod; the folded support frame is turned over to the side of the main frame to complete the folding of the tent frame; the unfolding or folding operation of the tent is more convenient and labor-saving, and the volume of the tent after folding is more convenient. Small for easy storage.

3. In the present invention, both a Y-shaped support frame and a Y-shaped support frame can be selected. The tent is supported on the ground by the support rod, and the tent support is not easy to shake when in use, which greatly improves the tent. The stability of the bracket support.

4. In the present invention, the cross-sectional shapes of the main connecting rod, the sleeve rod, the frame rod and the support rod are all non-circular, and the shape of the hollow structure of the main connecting rod is adapted to the cross-sectional shape of the sleeve rod. The shape of the hole is adapted to the cross-sectional shape of the frame rod, and the non-circular cross-sectional shape can make the tent stand less likely to rotate during use, and can improve the stability of the tent stand.

Description of drawings

Fig. 1 is one of the three-dimensional schematic diagrams of the present invention;

Fig. 2 is the second three-dimensional schematic diagram of the present invention;

Fig. 3 is the three-dimensional schematic diagram of the present invention;

Fig. 4 is the exploded schematic diagram of Fig. 1;

Fig. 5 is the partial structure schematic diagram of the present invention;

6 is a schematic structural diagram of the main support;

Figure 7 is an exploded schematic view of the main support;

Figure 8 is a cross-sectional view of the main bracket;

9 is a schematic structural diagram of a first connection seat;

10 is a cross-sectional view of the first connection seat;

11 is a schematic structural diagram of a first switch;

Fig. 12 is one of the structural representations of the multi-angle top die base;

Fig. 13 is the second structural schematic diagram of the multi-angle top die base;

Figure 14 is a schematic diagram of a support frame structure;

Figure 15 is an exploded schematic view of the support frame;

16 is a schematic structural diagram of the second connection seat;

Figure 17 is a cross-sectional view of the second connection seat;

18 is a schematic structural diagram of a second switch;

Figure 19 is one of the sectional views of the support frame;

Figure 20 is an exploded schematic view of Figure 19;

Figure 21 is the second sectional view of the support frame;

FIG. 22 is an exploded schematic view of FIG. 21 .

Description of reference numbers:

Multi-angle top die base 100, upper die base 110, upper hinge base 111, lower die base 120, lower hinge base 121;

Main bracket 200 , main link 210 , first connecting component 220 , first connecting seat 221 , first connecting hole 2211 , first installation port 2212 , protruding column 2213 , first limiting portion 2214 , second limiting portion 2215 , the first switch 222, the block 2221, the groove 2222, the limit groove 2223, the spring 223, the sleeve rod 230, the bayonet 231, the limit piece 240, the first hinge piece 250, the second hinge piece 260;

The support frame 300, the frame rod 310, the first socket port 311, the second connection assembly 320, the second connection base 321, the second connection hole 3211, the third connection hole 3212, the second installation port 3213, the second socket port 3214, The positioning port 3215 , the third limiting portion 3216 , the second switch 322 , the switch body 3221 , the pin 3222 , the positioning column 3223 , the limit hook 3224 , the support rod 330 , and the foot cover 340 .

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

It should be noted in the present invention that the terms "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" are all based on the orientation or positional relationship shown in the drawings, only It is for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element of the present invention must have a specific orientation, and therefore should not be construed as a limitation of the present invention.

Example

As shown in FIGS. 1 to 6 , the present invention discloses a tent support that is easy to fold, including a multi-angle top mold base 100 , a main support 200 and a support frame 300 .

The main support 200 includes a main connecting rod 210, a first connecting component 220 and a sleeve rod 230. The main connecting rod 210 is a hollow structure, one end of which is hinged on the multi-angle top die base 100, and the other end is installed with the first connecting component 220. One end of the rod 230 is inserted into the main link 210 , and the sleeve rod 230 and the main link 210 are detachably connected through the first connecting component 220 .

1 , 4 , 6 , 12 and 13 , the multi-angle top die base 100 includes an upper die base 110 and a lower die base 120 located below the upper die base 110 . The upper die base 110 includes several edges The upper hinge seat 111 and the lower mold seat 120 include a plurality of lower hinge seats 121 arranged along its circumferential direction. In this embodiment, the number of the upper hinge seat 111 is at least two, and the number of the lower hinge seat 121 is at least two. The number of the upper hinge bases 111 is not less than that of the main bracket 200. The end of the main bracket 200 is provided with a first hinge member 250, the first hinge member 250 is connected with the upper hinge base 111, and the first hinge member 250 is connected with a second hinge member 260. The second hinge member 260 is connected with the lower hinge base 121 .

In the present invention, the user can select a multi-angle top die seat with different numbers of upper hinge seats and lower hinge seats according to actual use requirements, as shown in Figure 11 and Figure 12, so that the upper hinge seat and the lower die seat of the upper die seat are The lower hinge seat can be connected to the required number of main links 210, so that the tent can be unfolded in various shapes, meet the different needs of users, improve the user experience, and be beneficial to the market promotion of the product.

As shown in FIGS. 6 to 11 , the first connection assembly 220 includes a first connection seat 221 and a first switch 222 . The first connection seat 221 is provided with a first connection hole 2211 of a hollow structure, and the main link 210 is inserted in the In the first connection hole 2211, the first connection seat 221 is provided with a first installation port 2212 which communicates with the first connection hole 2211, the first switch 222 is arranged in the first installation hole 2212, and the sleeve rod 230 is inserted into the first installation hole 2212. In the connecting hole 2211 and the main link 210 , the sleeve rod 230 and the first connecting seat 221 are detachably connected through the first switch 222 .

The first connecting assembly 220 further includes a spring 223, the spring 223 is arranged between the first connecting seat 221 and the first switch 222, the first switch 222 is in a ring structure, and the inner wall of the first switch 222 extends toward its center to form a card Block 2221, a bayonet 231 is provided on the sleeve rod 230, and the first switch 222 makes the catch block 2221 snap into the bayonet 231 under the action of the spring 223. The outer wall of the first switch 222 is provided with a groove 2222 in the direction of the blocking block 2221. The first connecting seat 221 protrudes in the direction facing the groove 2222 to form a convex column 2213. The spring 223 is sleeved on the convex column 2213 and accommodates Placed in groove 2222.

The size of the first switch 222 is adapted to the size of the first installation opening 2212 . The first installation opening 2212 protrudes toward the middle to form a first limiting portion 2214 , and the first switch 222 is provided with a limiting groove 2223 . The positioning portion 2214 is matched with the limiting groove 2223 . A limiting member 240 is inserted at the end of the sleeve rod 230 , a second limiting portion 2215 is provided in the first connecting seat 221 , and the main link 210 and the limiting member 240 abut on the second limiting portion 2215 respectively.

1 to 5, 13 to 22, the support frame 300 includes a frame rod 310, a second connecting component 320 and a support rod 330. One end of the frame rod 310 is hinged with the 230 sleeve rod, and the frame rod 310 is connected to the support rod 310. The rods 330 are locked/unlocked through the second connecting member 320 , and the unlocked support rod 330 can be retracted into the rack rod 310 .

In one embodiment of the present invention, the structure of the second connecting assembly 320 is the same as that of the first connecting assembly 220, and the number of support rods 330 is one, that is, the support rod 330 is in a line shape, and the support rod 330 passes through the second connecting rod 330. The connecting piece 320 is locked/unlocked with the frame rod 310 , so as to realize the unfolding or folding of the support frame 300 .

In another embodiment of the present invention, the number of support rods 330 is two, and the two support rods 330 are in an inverted Y-shape.

The second connection assembly 320 includes a second connection seat 321 and a second switch 322; the second connection seat 321 is provided with a second connection hole 3211 with a hollow structure, and the two sides of the second connection hole 3211 are provided with third connection holes 3212. The third connection hole 3212 has a downward opening, the other end of the frame rod 310 is inserted into the second connection hole 3211 , the upper ends of the third connection hole 3212 are respectively hinged with support rods 330 , and the two support rods 330 are connected to the frame after unfolding. The rod 310 is Y-shaped; the second connection seat 321 is provided with a second installation port 3213 communicating with the second connection hole 3211, the lower end of the frame rod 310 is provided with a first socket 311, and the second switch 322 is provided in the second installation The port 3213 can be mated with the first plug port 311 . The second installation port 3213 is provided with a second insertion port 3214, the second insertion port 3214 communicates with the second connection hole 3211, and the second installation port 3213 is provided on the side of the second insertion port 3214 towards the second connection hole 3211. The positioning port 3215 is formed with a third limiting portion 3216 at the opening edge of the positioning port 3215.

The second switch 322 includes a switch body 3221 and a plug 3222. The shape of the switch body 3221 is adapted to the shape of the second installation port 3213. The switch body 3221 extends to one side to form a plug 3222. The plug 3222 and the second plug port 3214 match.

In the present embodiment, the insertion post 3222 and the second insertion port 3214 are transition fit, so that the insertion post 3222 is easy to be inserted and pulled out, and is not easily loosened. The second switch 322 further includes a positioning post 3223 and a limit hook 3224. The side of the switch body 3221 is formed with a positioning post 3223 parallel to the insertion post 3222, and the end of the positioning post 2323 extends to the outside of the switch body 3221 to form a limit The hook 3224 and the positioning post 3223 are inserted into the positioning opening 3215 , and the third limiting portion 3216 prevents the limiting hook 3224 from leaving the positioning opening 3215 , so that the limiting hook 3224 can only move in the positioning opening 3215 .

The upper end of the support rod 330 is inserted into the second connection hole 3211 , and the upper end of the support rod 330 is hinged in the second connection hole 3211 . The foot cover 340 is abutted against the opening at the lower end of the second connection hole 3211 , so that the first socket 311 is aligned with the second socket 3214 . In this embodiment, the foot cover 340 is in the shape of a truncated cone, and its lower end abuts on the side of the support rod 330 . The tent support is unfolded and supported on the ground, so that the tent support is not easily shaken during use, which greatly improves the stability of the tent support support.

The second connection seat 321 defines a plurality of third connection holes 3212 around the second connection hole 3211 , and a support rod 330 is inserted in each of the third connection holes 3212 . In this embodiment, the number of the third connection holes 3212 is two, which are symmetrically arranged on both sides of the second connection holes 3211 .

In this embodiment, the cross-sectional shapes of the main link 210 , the sleeve rod 230 , the frame rod 310 and the support rod 330 are non-circular, and the shape of the hollow structure of the main link 210 is adapted to the cross-sectional shape of the sleeve rod 230 . The shape of the connecting hole 3211 is adapted to the cross-sectional shape of the frame rod 310. Specifically, the non-circular cross-sectional shape includes a circular arc surface and a plane connected to both ends of the circular arc surface. This non-circular cross-sectional shape can prevent the tent support. Rotation during use can improve the stability of the tent stand.

In yet another embodiment of the present invention, in addition to selecting all the in-line or Y-shaped support frames 300 as required, the user can also select a Y-shaped and in-line support frame 300, and the tent is supported on the ground through the support frame 300. On the other hand, the tent bracket is not easy to shake when in use, so as to ensure the stability of the tent bracket support.

The working principle of the present invention is as follows:

When the tent support is unfolded, the sleeve rod 230 received in the main link 210 is pulled out until the limiter 240 abuts on the second limiter 2215 , and the block 2221 of the first switch 222 is locked under the action of the spring 223 . The bayonet 231 of the sleeve rod 230 makes the connection and fixation between the main link 210 and the sleeve rod 230 to realize the expansion of the main bracket 200 . After the main support 200 is unfolded, the support frame 300 is turned over to the side facing the ground, and then the support rod 330 is moved downward so that the first socket 311 of the rod 310 is aligned with the second socket 3214 of the second connection base 321, and then By pressing the second switch 322 , the post 3222 is mated with the second socket 3214 , so as to fix the frame rod 310 on the second connecting seat 321 , and realize the unfolding of the support frame 300 .

When the tent support is retracted, press the first switch 222 to make the block 2221 separate from the bayonet 231 of the sleeve rod 230 to release the connection and fixation between the main link 210 and the sleeve rod 230, and then the sleeve rod 230 can be received into the main link 210 , so that the sleeve rod 230 is overlapped with the main link 210 to realize the retraction of the main bracket 200 . Then, the supporting frame 300 is folded, that is, the second switch 322 is pulled out first to separate the plug 3222 from the second plug port 3214, so as to release the connection and fixed relationship between the frame rod 310 and the second connection seat 321, and then move the first Two connecting bases 321 , the second connecting base 321 can move along the frame rod 310 with the support rod 330 until the support rod 330 is moved to overlap with the frame rod 310 , thereby completing the retraction of the support frame 300 . After the main bracket 200 and the supporting bracket 300 are folded, the folded supporting bracket 300 is turned over to the side of the main bracket 200 , that is, the entire folding of the tent bracket is completed.

The above description is only a preferred embodiment of the present invention, but the protection scope of the present invention is not limited to this. Substitutions should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claims.

Claims (10)

1. The utility model provides a tent support convenient to fold up which characterized in that: comprises a multi-angle top die holder, a main bracket and a support frame;

the multi-angle top die base comprises an upper die base and a lower die base positioned below the upper die base, the upper die base comprises a plurality of upper hinged seats arranged along the circumferential direction of the upper die base, and the lower die base comprises a plurality of lower hinged seats arranged along the circumferential direction of the lower die base;

the main support comprises a main connecting rod, a first connecting assembly and a sleeve rod, the main connecting rod is of a hollow structure, one end of the main connecting rod is hinged to the upper hinge seat and the lower hinge seat respectively, the first connecting assembly is installed at the other end of the main connecting rod, one end of the sleeve rod is inserted into the main connecting rod, and the sleeve rod and the main connecting rod are detachably connected through the first connecting assembly;

the support frame comprises a frame rod, a second connecting assembly and a support rod, one end of the frame rod is hinged with the sleeve rod, the frame rod and the support rod are locked/unlocked through the second connecting assembly, and the unlocked support rod can extend and retract into the frame rod.

2. The tent frame of claim 1, which is easy to fold, further comprising: the second connecting assembly comprises a second connecting seat and a second switch; the second connecting seat is provided with a second connecting hole with a hollow structure, third connecting holes are formed in two sides of the second connecting hole, the other end of the rack rod is inserted into the second connecting hole, the upper ends of the third connecting holes are respectively hinged with the supporting rods, and the two supporting rods and the rack rod are inverted Y-shaped after being unfolded; the second connecting seat is provided with a second mounting opening communicated with the second connecting hole, the lower end of the hack lever is provided with a first inserting opening, and the second switch is arranged in the second mounting opening and can be inserted and matched with the first inserting opening.

3. The tent frame of claim 2, which is easy to fold, further comprising: the second switch comprises a switch body and an inserting column, the shape of the switch body is matched with that of the second mounting opening, the switch body extends towards one side to form the inserting column, and the inserting column is matched with the second inserting opening in an inserting mode.

4. The tent frame of claim 1, which is easy to fold, further comprising: the quantity of going up articulated seat is two at least, the quantity of articulated seat is no less than down go up the quantity of articulated seat, the tip of main support is provided with first articulated elements, first articulated elements links to each other with last articulated seat, be connected with the second articulated elements on the first articulated elements, the second articulated elements links to each other with articulated seat down.

5. The tent frame of claim 1, which is easy to fold, further comprising: the first connecting assembly comprises a first connecting seat and a first switch; the first connecting seat is provided with a first connecting hole with a hollow structure, the main connecting rod is inserted into the first connecting hole, and the first connecting seat is provided with a first mounting port communicated with the first connecting hole; the first switch is arranged in the first mounting opening, the loop bar is inserted in the first connecting hole and the main connecting rod, and the loop bar and the first connecting seat are detachably connected through the first switch.

6. The tent frame of claim 5, which is easy to fold, further comprising: first connecting element still includes the spring, the spring is located between first connecting seat and the first switch, the first switch is annular structure, the inner wall of first switch is formed with the fixture block toward its central direction extension, be equipped with the bayonet socket on the loop bar, the first switch makes under the effect of spring the fixture block card is gone into in the bayonet socket.

7. The tent frame of claim 6, which is easy to fold, further comprising: the outer wall of the first switch is provided with a groove facing the direction of the clamping block, the first connecting seat is convexly extended towards the direction opposite to the groove to form a convex column, and the spring is sleeved on the convex column and is contained in the groove.

8. The tent frame of claim 5, which is easy to fold, further comprising: the size of the first switch is matched with that of the first mounting opening, the first mounting opening protrudes towards the middle of the first mounting opening to form a first limiting part, a limiting groove is formed in the first switch, and the first limiting part is matched with the limiting groove; the end of the loop bar is inserted with a limiting piece, a second limiting part is arranged in the first connecting seat, and the main connecting rod and the limiting piece are respectively abutted against the second limiting part.

9. The tent frame of claim 5, which is easy to fold, further comprising: the structure of the second connecting assembly is the same as that of the first connecting assembly, the number of the supporting rods is one, and the supporting rods are locked/unlocked with the frame rods through the second connecting pieces.

10. A collapsible tent frame as claimed in any one of claims 1 to 9, wherein: the cross sections of the main connecting rod, the sleeve rod, the frame rod and the supporting rod are non-circular, the shape of the hollow structure of the main connecting rod is matched with the cross section of the sleeve rod, and the shape of the second connecting hole is matched with the cross section of the frame rod.

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