CN218333008U

CN218333008U - Back frame

Info

Publication number: CN218333008U
Application number: CN202121593281.8U
Authority: CN
Inventors: 刘爱华; 邓涛
Original assignee: Shenzhen Lightlink Display Technology Co Ltd
Current assignee: Shenzhen Lightlink Display Technology Co Ltd
Priority date: 2021-07-13
Filing date: 2021-07-13
Publication date: 2023-01-17
Anticipated expiration: 2031-07-13

Abstract

The utility model relates to a LED display screen technical field, in particular to back of body frame. The box installation lockpin of first LED display screen, the box installation back of the body frame of second LED display screen, first lock handle card is gone into the second bayonet socket, the locking hole in the lockpin is inserted to first lock axle, when second lock handle card is gone into the fourth bayonet socket, the locking hole in the lockpin is inserted to the second lock axle, carry out the dismouting through the plug mode, and easy operation saves time, and the solution is when two LED display screens splice, adopts the bolted connection mode to make the dismouting complicated, problem consuming time many.

Description

Back frame

Technical Field

The utility model relates to a LED display screen technical field, in particular to back of body frame.

Background

At present, when two LED display screens splice, most all adopt the bolt to carry out threaded connection, but adopt the concatenation mode of bolt, the dismouting is more complicated, and is consuming time many.

SUMMERY OF THE UTILITY MODEL

Not enough to prior art, the utility model provides a back of body frame aims at solving when two LED display screens concatenations, adopts bolted connection mode to make the dismouting complicated, problem many consuming time.

The utility model provides a technical scheme is:

a back frame comprises a left support rod assembly, a right support rod assembly and a middle support rod assembly;

the left support rod assembly comprises a first support rod, a first connecting block and a first lock body, the first connecting block is connected with one end of the first support rod, and the first connecting block is further used for being installed on the upper side wall of a box body of the second LED display screen;

the first lock body comprises a first lock body, a first lock shaft and a first lock handle, the first lock body is connected with the other end of the first support rod, the first lock body is further used for being installed on the lower side wall of a box body of a second LED display screen, the first lock body is provided with a first groove, a first transverse hole and a first longitudinal hole, the first transverse hole penetrates through the bottom of the first groove, the first transverse hole is communicated with the first longitudinal hole, the first lock shaft is inserted into the first transverse hole, the first lock handle penetrates through the first groove and is connected with the first lock shaft, the side wall of the first groove is provided with a first bayonet and a second bayonet, the first longitudinal hole is used for inserting a lock pin in the box body of the first LED display screen, when the first lock handle is clamped into the second bayonet, the first lock shaft is inserted into a lock hole in the lock pin arranged in the first longitudinal hole, and when the first lock handle is clamped into the first bayonet, the first lock shaft is withdrawn from the lock hole in the lock pin arranged in the first longitudinal hole;

the right supporting rod assembly comprises a second supporting rod, a second connecting block and a second lock body, the second connecting block is connected with one end of the second supporting rod, and the second connecting block is further used for being installed on the upper side wall of a box body of a second LED display screen;

the second lock body comprises a second lock body, a second lock shaft and a second lock handle, the second lock body is connected with the other end of the second support rod, the second lock body is also used for being installed on the lower side wall of a box body of a second LED display screen, the second lock body is provided with a second groove, a second transverse hole and a second longitudinal hole, the second transverse hole penetrates through the bottom of the second groove, the second transverse hole is communicated with the second longitudinal hole, the second lock shaft is inserted into the second transverse hole, the second lock handle penetrates through the second groove and is connected with the second lock shaft, the side wall of the second groove is provided with a third bayonet and a fourth bayonet, the second longitudinal hole is used for inserting a lock pin into the box body of the first LED display screen, when the second lock handle is clamped into the fourth bayonet, the second lock shaft is inserted into a lock hole in a lock pin arranged in the second longitudinal hole, and when the second lock handle is clamped into the third bayonet, the lock shaft is arranged in the lock pin arranged in the lock hole in the second longitudinal hole, and the lock pin is withdrawn from the lock hole;

the left branch vaulting pole subassembly includes first connecting rod and second connecting rod, the right branch vaulting pole subassembly includes right connecting rod and first rotary mechanism, first connecting rod one end with first connecting block is connected, the other end with the intermediate strut pole subassembly is connected, second connecting rod one end with this body coupling of first lock, the other end with the intermediate strut pole subassembly is connected, first rotary mechanism locates the second bracing piece is located the second connecting block with between the second lock body, right side connecting rod one end with first rotary mechanism connects, the other end with the intermediate strut pole subassembly is connected.

Further, the left support rod assembly comprises a first rotating block and a first rotating shaft, the first lock body is provided with a first rotating groove, a fourth clamping groove and a first rotating hole, the first rotating hole is communicated with the first rotating groove, the fourth clamping groove is formed in the side wall of the first rotating groove and corresponds to the first rotating hole, the first rotating block comprises a first inserting portion and a first connecting portion, the first inserting portion is provided with a first shaft hole, the first inserting portion is inserted into the first rotating groove, the first rotating shaft is connected with the first rotating hole and penetrates through the first shaft hole to be inserted into the fourth clamping groove, and one end of the first connecting rod is connected with the first connecting portion.

Further, first connecting portion are equipped with first index pin, first lock body is equipped with first rotatory draw-in groove and the rotatory draw-in groove of second, works as when first rotatory piece rotates first rotational position, first index pin card goes into first rotatory draw-in groove, works as when first rotatory piece rotates the second rotational position, first index pin card goes into the rotatory draw-in groove of second.

Further, left side bracing piece subassembly includes the rotatory piece of second and second pivot, first connecting block is equipped with second swivelling chute, fifth draw-in groove and second rotation hole, the second rotate the hole with the second swivelling chute intercommunication, the fifth draw-in groove is located the lateral wall of second swivelling chute, and with the second rotates the hole and corresponds, the rotatory piece of second includes that the second inserts portion and second connecting portion, the second inserts the portion and is equipped with the second shaft hole, the second inserts the portion and inserts the second swivelling chute, the second pivot with the second rotates jogged joint, and passes the second shaft hole inserts the fifth draw-in groove, the one end of second connecting rod with the second connecting portion are connected.

Furthermore, the second connecting portion are provided with a second indexing pin, the first connecting block is provided with a third rotary clamping groove and a fourth rotary clamping groove, when the second rotary block rotates to a third rotary position, the second indexing pin is clamped into the third rotary clamping groove, and when the second rotary block rotates to a fourth rotary position, the second indexing pin is clamped into the fourth rotary clamping groove.

Further, first rotary mechanism includes first rotating member, first spacing ring and second spacing ring, first spacing ring with the second spacing ring cup joint in the second bracing piece, first rotating member rotates the cover to be located the second bracing piece, and is located first spacing ring with between the second spacing ring, first rotating member one end with first spacing ring butt, the other end with the second spacing ring butt, first rotating member is equipped with the third connecting portion, the third connecting portion with the right connecting rod is connected.

Further, first rotating member is equipped with the third graduation round pin, first rotating member is equipped with fifth rotation draw-in groove and sixth rotation draw-in groove, works as when first rotating member rotates fifth rotational position, third graduation round pin card is gone into fifth rotation draw-in groove, works as when first rotating member rotates sixth rotational position, third graduation round pin card is gone into sixth rotation draw-in groove.

Further, the right connecting rod includes first pole, second pole and slewing mechanism, slewing mechanism includes first turning block, second turning block and axis of rotation, a lateral wall of first turning block is equipped with the rotation inserted block, another lateral wall of first turning block with the one end of first pole is connected, the other end of first pole with the intermediate strut pole subassembly is connected, a lateral wall of second turning block is equipped with the rotation groove, another lateral wall of second turning block with the one end of second pole is connected, the other end of second pole with the intermediate strut pole subassembly is connected, the second turning block is equipped with the rotation hole, the rotation hole with the rotation groove intercommunication, the rotation inserted block is equipped with the shaft hole, the rotation inserted block inserts the rotation groove, the axis of rotation with the rotation jogged joint, and pass the shaft hole.

Further, slewing mechanism includes the fourth graduation round pin, the fourth graduation round pin is located the second rotating block, it is equipped with the rotatory draw-in groove of third to rotate the inserted block, works as when first rotating block rotates the third rotational position, the fourth graduation round pin card is gone into the rotatory draw-in groove of third.

According to the technical scheme, the utility model discloses beneficial effect: the box installation lockpin of first LED display screen, the box installation back of the body frame of second LED display screen, first lock handle card is gone into the second bayonet socket, the locking hole in the lockpin is inserted to first lock axle, when second lock handle card is gone into the fourth bayonet socket, the locking hole in the lockpin is inserted to the second lock axle, carry out the dismouting through the plug mode, and easy operation saves time, and the solution is when two LED display screens splice, adopts the bolted connection mode to make the dismouting complicated, problem consuming time many.

Drawings

Fig. 1 is a schematic structural diagram of a back frame provided by an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a left support rod assembly provided by the embodiment of the invention;

fig. 3 is a schematic structural diagram of a first support rod provided by the embodiment of the present invention;

fig. 4 is a schematic structural diagram of a first connecting block provided by an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a first rotating block provided by an embodiment of the present invention;

fig. 6 is a schematic structural diagram of a second rotating block provided by the embodiment of the present invention;

fig. 7 is a schematic structural diagram of a first lock body provided by the embodiment of the present invention;

fig. 8 is a schematic structural diagram of a first lock body provided by an embodiment of the present invention;

fig. 9 is a cross-sectional view of a first lock body provided by an embodiment of the present invention;

fig. 10 is a schematic structural diagram of a first lock shaft provided by an embodiment of the present invention;

fig. 11 is a schematic structural diagram of a right support rod assembly provided by an embodiment of the present invention;

fig. 12 is a schematic structural view of a second support rod provided by the embodiment of the present invention;

fig. 13 is a schematic structural diagram of a right connecting rod provided by the embodiment of the present invention;

fig. 14 is a schematic structural view of another right support rod assembly provided by the embodiment of the present invention;

fig. 15 is a schematic structural diagram of a second lock body provided by the embodiment of the present invention;

fig. 16 is a schematic structural view of an intermediate support rod assembly provided by an embodiment of the present invention;

fig. 17 is a schematic structural diagram of a third support rod provided by the embodiment of the present invention;

fig. 18 is a schematic structural diagram of a connection mechanism provided by an embodiment of the present invention;

fig. 19 is a schematic structural diagram of a first sleeve provided by an embodiment of the present invention;

fig. 20 is a schematic structural diagram of a connecting pipe provided by the embodiment of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

As shown in fig. 1 to 10, an embodiment of the present invention provides a back frame 6, which includes a left support rod assembly 3, a right support rod assembly 4, and a middle support rod assembly 5.

The left support rod assembly 3 comprises a first support rod 31, a first connecting block 32 and a first lock body 2, wherein the first connecting block 32 is connected with one end of the first support rod 31, and the first connecting block 32 is further used for being mounted on the upper side wall of the box body of the second LED display screen.

The first lock body 2 comprises a first lock body 21, a first lock shaft 22 and a first lock handle 23, the first lock body 21 is connected with the other end of the first support rod 31, the first lock body 21 is also used for being installed on the lower side wall of the box body of the second LED display screen, the first lock body 21 is provided with a first groove 211, a first transverse hole 212 and a first longitudinal hole 213, the first transverse hole 212 penetrates through the bottom of the first groove 211, the first transverse hole 212 is communicated with the first longitudinal hole 213, the first lock shaft 22 is inserted into the first transverse hole 212, the first lock handle 23 is connected with the first lock shaft 22 through the first groove 211, the side wall of the first groove 211 is provided with a first bayonet 2111 and a second bayonet 2112, the first longitudinal hole 213 is used for inserting a lock pin in the box body of the first LED display screen, when the first lock handle 23 is clamped into the second bayonet 2112, the first lock shaft 22 is inserted into a lock hole in a lock pin in the first longitudinal hole 213, and when the first lock handle 23 is clamped into the first bayonet 2111, the first lock pin 22 is arranged in the first lock shaft 213 and is withdrawn from the first lock hole 213.

The first lock handle 23 moves rightwards to drive the first lock shaft 22 to move rightwards, the side wall of the first groove 211 blocks the first lock handle 23, the first lock handle 23 rotates to be clamped into the second bayonet 2112, the first lock shaft 22 is inserted into the locking hole in the lock pin, and at the moment, the first lock body 2 is in a locking state. The first lock handle 23 rotates to exit from the second bayonet 2112, the first lock handle 23 moves leftwards to drive the first lock shaft 22 to move leftwards, the side wall of the first groove 211 blocks the first lock handle 23, the first lock handle 23 rotates to be clamped into the first bayonet 2111, the first lock shaft 22 exits from the locking hole in the lock pin, and at the moment, the first lock body 2 is in an unlocking state.

Specifically, the first lock handle 23 is clamped into the second bayonet 2112, the first lock shaft 22 is completely inserted into the first transverse hole 212, the first lock handle 23 is clamped into the first bayonet 2111, and a part of the first lock shaft 22 is withdrawn from the first transverse hole 212 and exposed out of the first lock body 21.

The right support rod assembly 4 comprises a second support rod 41, a second connecting block 42 and a second lock body 2a, the second connecting block 42 is connected with one end of the second support rod 41, and the second connecting block 42 is also used for being mounted on the upper side wall of the box body of the second LED display screen.

The second lock body 2a includes a second lock body 21a, a second lock shaft 22a and a second lock handle 23a, the second lock body 21a is connected to the other end of the second support rod 41, the second lock body 21a is further configured to be mounted on a lower side wall of a box body of the second LED display screen, the second lock body 21a is provided with a second recess 211a, a second transverse hole 212a and a second longitudinal hole 213a, the second transverse hole 212a penetrates through a bottom of the second recess 211a, the second transverse hole 212a is communicated with the second longitudinal hole 213a, the second lock shaft 22a is inserted into the second transverse hole 212a, the second lock handle 23a penetrates through the second recess 211a to be connected with the second lock shaft 22a, a side wall of the second recess 211a is provided with a third notch 2111a and a fourth notch 2112a, the second longitudinal hole 213a is used for inserting the lock pin in the box body of the first LED display screen, when the second lock pin 23a is snapped into the fourth notch 2112a, the second lock shaft 22a is inserted into the second longitudinal hole of the second lock shaft 2111a, and when the second lock pin 23a is snapped into the lock pin of the second lock shaft 213a, the second lock shaft 22a is inserted into the second longitudinal hole, the second lock pin is snapped into the second lock pin of the second lock shaft 213a, and the second lock handle 23 a. The second lock handle 23a moves leftwards, the second lock shaft 22a is driven to move leftwards, the side wall of the second groove 211a blocks the second lock handle 23a, the second lock handle 23a rotates and is clamped into the fourth bayonet 2112a, the second lock shaft 22a is inserted into the locking hole of the lock pin, and at the moment, the second lock body is in a locking state. The second lock handle 23a rotates to exit the fourth bayonet 2112a, the second lock handle 23a moves rightward, the second lock shaft 22a is driven to move rightward, the side wall of the second groove 211a blocks the second lock handle 23a, the second lock handle 23a rotates to be clamped into the third bayonet 2111a, the second lock shaft 22a exits from the locking hole in the lock pin, and at this time, the second lock body is in an unlocked state.

Specifically, the second lock handle 23a is clamped into the fourth bayonet 2112a, the second lock shaft 22a is completely inserted into the second transverse hole 212a, the second lock handle 23a is clamped into the third bayonet 2111a, and a portion of the second lock shaft 22a is withdrawn from the second transverse hole 212a and exposed to the second lock body 21a.

The left support rod component 3 comprises a first connecting rod 333 and a second connecting rod 337, the right support rod component 4 comprises a right connecting rod 43 and a first rotating mechanism 44, one end of the first connecting rod 333 is connected with the first connecting block 32, the other end of the first connecting rod is connected with the middle support rod component 5, one end of the second connecting rod 337 is connected with the first lock body 21, the other end of the second connecting rod 337 is connected with the middle support rod component 5, the first rotating mechanism 44 is arranged on the second support rod 41 and is located between the second connecting block 42 and the second lock body, one end of the right connecting rod 43 is connected with the first rotating mechanism 44, and the other end of the right connecting rod 43 is connected with the middle support rod component 5.

The box installation lockpin of first LED display screen, the box installation back of the body frame 6 of second LED display screen, first lock handle 23 card goes into second bayonet socket 2112, first lock axle 22 inserts the locking hole in the lockpin, when second lock handle 23a card goes into fourth bayonet socket 2112a, the locking hole in second lock axle 22a insertion lockpin, carry out the dismouting through the plug mode, and is simple in operation, save time, when solving two LED display screens concatenations, adopt bolted connection mode to make the dismouting complicated, problem consuming time many.

In this embodiment, the first lock body 2 includes the first wave ball screw 24, the first lock body 21 is provided with the first mounting hole 214, the first mounting hole 214 is communicated with the first transverse hole 212, the first wave ball screw 24 is connected with the first mounting hole 214, the first lock shaft 22 is provided with the first clamping groove 221 and the second clamping groove 222, when the first lock handle 23 is clamped into the second bayonet 2112, the first wave ball screw 24 is clamped into the first clamping groove 221, and when the first lock handle 23 is clamped into the first bayonet 2111, the first wave ball screw 24 is clamped into the second clamping groove 222. Thus, by positioning the first wave ball screw 24, it can be avoided that the first lock handle 23 is clamped into the first bayonet 2111 or the second bayonet 2112, and the first lock shaft 22 is accidentally rotated, so that the first lock handle 23 is clamped out of the first bayonet 2111 or the second bayonet 2112.

In this embodiment, the inner sidewall of the first longitudinal hole 213 is provided with a third locking groove 2131, and when the first lock handle 23 is locked into the second locking notch 2112, the first lock shaft 22 is inserted into the third locking groove 2131 through the first longitudinal hole 213. When the first lock body 2 is in the locked state, the first lock shaft 22 abuts against the hole wall of the first transverse hole 212 and the groove wall of the third clamping groove 2131, so that the first lock shaft 22 is more stable.

In this embodiment, the left support rod assembly 3 includes a first rotation block 331 and a first rotation shaft 332, the first lock body 21 is provided with a first rotation groove 215, a fourth clamping groove 2151 and a first rotation hole 2152, the first rotation hole 2152 is communicated with the first rotation groove 215, the fourth clamping groove 2151 is provided on a side wall of the first rotation groove 215 and corresponds to the first rotation hole 2152, the first rotation block 331 includes a first insertion portion 3311 and a first connection portion 3312, the first insertion portion 3311 is provided with a first shaft hole 33111, the first insertion portion 3311 is inserted into the first rotation groove 215, the first rotation shaft 332 is connected with the first rotation hole 2152 and passes through the first shaft hole 33111 to be inserted into the fourth clamping groove 2151, and one end of the first connection rod 333 is connected with the first connection portion 3312. The first lock body 21 not only has a locking function but also provides a function of rotational coupling. The first rotation block 331 rotates in the first rotation groove 215 about the first rotation shaft 332, and the first link 333 rotates about the first rotation shaft 332 due to the connection of the first connection part 3312 with the first link 333. The other end of the first link 333 is for connection and fixation.

In this embodiment, the first connecting portion 3312 is provided with a first index pin 33121, the first lock body 21 is provided with a first rotary slot 2161 and a second rotary slot 2162, when the first rotary block 331 rotates to the first rotary position, the first index pin 33121 is inserted into the first rotary slot 2161, and when the first rotary block 331 rotates to the second rotary position, the first index pin 33121 is inserted into the second rotary slot 2162. The first lock body 21 provides the first rotation block 331 rotated at it with the first and

second rotation notches

2161 and 2162 that are rotationally positioned, thereby rotationally positioning the rotation of the first link 333.

Specifically, when the first index pin 33121 is inserted into the first rotary slot 2161, the first connecting rod 333 protrudes out of the box body of the second LED display screen, and the first connecting rod 333 supports the box body of the second LED display screen to erect the second LED display screen. When the first index pin 33121 is inserted into the second rotary slot 2162, the first link 333 is received in the box of the second LED display screen, which facilitates transportation of the second LED display screen.

In this embodiment, the left support rod assembly 3 includes a first threaded pin 34, the first connecting block 32 is provided with a first through hole 321 and a first screw hole 322, the first screw hole 322 penetrates through the first connecting block 32 and is communicated with the first through hole 321, the first support rod 31 is provided with a first pin hole 311, the first support rod 31 is inserted into the first through hole 321, and the first threaded pin 34 is connected with the first screw hole 322 and passes through the first pin hole 311. The first connecting block 32 is connected with the first supporting rod 31 in a firm and cost-saving manner.

Specifically, the first connecting block 32 can also be used for mounting a lock pin, and the upper side wall of the box body of the second LED display screen can be spliced with another LED display screen.

In this embodiment, the left support rod assembly 3 includes a second rotation block 335 and a second rotation shaft 336, the first connection block 32 is provided with a second rotation groove 323, a fifth locking groove 324 and a second rotation hole 325, the second rotation hole 325 is communicated with the second rotation groove 323, the fifth locking groove 324 is provided at a side wall of the second rotation groove 323 and corresponds to the second rotation hole 325, the second rotation block 335 includes a second insertion portion 3351 and a second connection portion 3352, the second insertion portion 3351 is provided with a second shaft hole 33511, the second insertion portion 3351 is inserted into the second rotation groove 323, the second rotation shaft 336 is connected with the second rotation hole 325 and is inserted into the fifth locking groove 324 through the second shaft hole 33511, and one end of the second connection rod 337 is connected with the second connection portion 3352. The first linkage block 32 may also provide the function of a swivel connection. The second rotating block 335 rotates in the second rotating groove 323 about the second rotating shaft 336, and the second connecting portion 3352 is connected to the second connecting rod 337, so that the second connecting rod 337 rotates about the second rotating shaft 336. The other end of the second link 337 is used for connection and fixation.

In this embodiment, the second connecting portion 3352 is provided with a second index pin 33521, the first connecting block 32 is provided with a third rotary slot 326 and a fourth rotary slot 327, the second index pin 33521 is inserted into the third rotary slot 326 when the second rotary block 335 is rotated to the third rotary position, and the second index pin 33521 is inserted into the fourth rotary slot 327 when the second rotary block 335 is rotated to the fourth rotary position. First link 32 provides rotationally positioned third rotational slot 326 and fourth rotational slot 327 for second rotational block 335 to rotate on, thereby rotationally positioning the rotation of second link 337.

Specifically, when the second index pin 33521 is clamped into the third rotary clamping slot 326, the second connecting rod 337 protrudes out of the box body of the second LED display screen, and the second connecting rod 337 has a supporting function on the box body of the second LED display screen, so that the second LED display screen is upright. When the second index pin 33521 is clamped into the fourth rotary clamping groove 327, the second connecting rod 337 is accommodated in the box body of the second LED display screen, so that the second LED display screen is convenient to transport.

In this embodiment, the left support rod assembly 3 includes a second threaded pin 338, the first lock body 21 is provided with a second threaded hole 217, the second threaded hole 217 penetrates through the first lock body 21 and is communicated with the first longitudinal hole 213, the first support rod 31 is provided with a second pin hole 312, the first support rod 31 is inserted into the first longitudinal hole 213, and the second threaded pin 338 is connected with the second threaded hole 217 and passes through the second pin hole 312; the first support rod 31 is a tube with a second through hole 313, the second through hole 313 is used for inserting a lock pin in the box of the first LED display screen, and the first support rod 31 is provided with a third through hole 314 for the first lock shaft 22 to pass through. The first lock body 21 and the first supporting rod 31 are connected firmly and cost-effectively.

As shown in fig. 11 to 15, in the present embodiment, the first rotating mechanism 44 includes a first rotating element 441, a first limiting ring 443 and a second limiting ring 444, the first limiting ring 443 and the second limiting ring 444 are sleeved on the second support rod 41, the first rotating element 441 is rotatably sleeved on the second support rod 41 and located between the first limiting ring 443 and the second limiting ring 444, one end of the first rotating element 441 abuts against the first limiting ring 443, the other end abuts against the second limiting ring 444, the first rotating element 441 has a third connecting portion 4411, and the third connecting portion 4411 is connected with the right connecting rod 43. The first rotating member 441 rotates around the second support rod 41, so that the right link 43 also rotates around the second support rod 41, and the right link 43 is used for connection and fixation.

In this embodiment, the first rotating member 441 is provided with a third indexing pin 442, the first rotating member 441 is provided with a fifth rotating slot 414 and a sixth rotating slot, the third indexing pin 442 is inserted into the fifth rotating slot 414 when the first rotating member 441 rotates to the fifth rotating position, and the third indexing pin 442 is inserted into the sixth rotating slot when the first rotating member 441 rotates to the sixth rotating position. The second support rod 41 provides a fifth rotation locking groove 414 and a sixth rotation locking groove for rotationally locking the first rotation member 441, so that the rotation of the right link 43 is rotationally locked.

Specifically, when the third index pin 442 is inserted into the fifth rotary slot 414, the right link 43 protrudes out of the box body of the second LED display screen, and the right link 43 supports the box body of the second LED display screen to erect the second LED display screen. When the third index pin 442 is clamped into the sixth rotary clamping groove, the right connecting rod 43 is accommodated in the box body of the second LED display screen, so that the second LED display screen is convenient to transport.

In this embodiment, the right link 43 includes a first rod 431, a second rod 432 and a rotation mechanism 433, the rotation mechanism 433 includes a first rotation block 4331, a second rotation block 4332 and a rotation shaft 4333, a side wall of the first rotation block 4331 is provided with a rotation insertion block 43311, the other side wall of the first rotation block 4331 is connected to one end of the first rod 431, the other end of the first rod 431 is connected to the intermediate support rod assembly 5, a side wall of the second rotation block 4332 is provided with a rotation groove 43322, the other side wall of the second rotation block 4332 is connected to one end of the second rod 432, the other end of the second rod 432 is connected to the intermediate support rod assembly 5, the second rotation block 4332 is provided with a third rotation hole 43321, the third rotation hole 43321 is communicated with the rotation groove 43322, the rotation insertion block 43311 is provided with a third shaft hole 433111, the rotation insertion block 43311 is inserted into the rotation groove 43322, and the rotation shaft 4333 is connected to the third rotation hole 43321 and passes through the third shaft hole 433111. The shape of the right link 43 is variable, and may be a straight rod in which the first rod 431 and the second rod 432 are aligned, a folded rod in which the first rod 431 and the second rod 432 are folded together, or a folded rod in which the first rod 431 and the second rod 432 are folded at a certain angle. Therefore, the right connecting rod 43 can support and fix the second LED display screen conveniently, and the second LED display screen can be stored and transported conveniently.

In this embodiment, the rotating mechanism 433 includes a fourth indexing pin 4334, the fourth indexing pin 4334 is disposed on the second rotating block 4332, the rotating insert block 43311 is disposed with a seventh rotating slot, and when the first rotating block 4331 rotates to the third rotating position, the fourth indexing pin 4334 is inserted into the seventh rotating slot. The third rotation position is that the first rod 431 and the second rod 432 are on the same straight line, and the fourth indexing pin 4334 is clamped into the seventh rotation clamping groove to limit rotation, so that the right connecting rod 43 is a straight rod.

As shown in fig. 16 to 20, the intermediate support rod assembly 5 includes a third support rod 51, a first link connection block 52, a second link connection block 53, a second rotation mechanism 54, and a connection mechanism 55.

The first connecting rod connecting block 52, the second connecting rod connecting block 53 and the second rotating mechanism 54 are arranged on the third supporting rod 51, the second rotating mechanism 54 is positioned between the first connecting rod connecting block 52 and the second connecting rod connecting block 53, the first connecting rod connecting block 52 is connected with the first connecting rod 333, the second connecting rod connecting block 53 is connected with the second connecting rod 337, and the second rotating mechanism 54 is connected with the right connecting rod 43.

The connecting mechanism 55 comprises a first sleeve 551, a first fixture block 552, a connecting fixing rod 553, a first connecting pin 554 and a second sleeve 555, the first sleeve 551 comprises a first barrel opening and a second barrel opening, the first fixture block 552 is provided with a first fixture hole 5521, the first fixture block 552 is arranged at the first barrel opening, the connecting fixing rod 553 comprises a lock head 5531, a rod 5532 and a second fixture block 5533, the lock head 5531 is arranged at the head of the rod 5532, the second fixture block 5533 is arranged at the tail of the rod 5532, the head of the rod 5532 is provided with a first circumferential bayonet 55321, the tail of the rod 5532 is provided with a second circumferential bayonet 55322, the connecting fixing rod 553 enters the first sleeve 551 through the second barrel opening, the lock head 5531 and the rod 5532 extend out of the first sleeve 551 through the first fixture hole 5521 and extend into the second sleeve 555, the second sleeve 555 is connected with the rod 5532 through the first connecting pin 554, and one end of the first sleeve 551 located at the second barrel opening is connected with a third support rod 51.

The second sleeve 555 moves forwards to enable the lock head 5531 to move forwards, the lock head 5531 is used for extending into a second clamping hole of a third clamping block in a box body of another LED display screen, the first clamping block 552 blocks the second clamping block 5533, the third clamping block is arranged in the first circumferential clamping opening 55321, the first clamping block 552 is arranged in the second circumferential clamping opening 55322, the second sleeve 555 rotates, the lock head 5531 and the rod 5532 clamp the third clamping block, and the second clamping block 5533 and the rod 5532 clamp the first clamping block 552.

In this embodiment, the second clamping block 5533 is provided with a second wave ball screw 55331, and the inner side wall of the first sleeve 551 is provided with a positioning hole 5511 corresponding to the second wave ball screw 55331. The second sleeve 555 moves backwards until the second sleeve 555 cannot move backwards, the second clamping block 5533 rotates to clamp the second ball screw 55331 into the positioning hole 5511, so that the locking head 5531 is aligned with the first clamping hole 5521, and the locking head 5531 conveniently extends out of the first sleeve 551 through the first clamping hole 5521.

In the present embodiment, the third supporting rod 51 is a tube having a fourth through hole 511.

In this embodiment, the intermediate supporting rod assembly 5 includes a second connecting pin 56, a fourth latch 57 and a connecting tube 58, one end of the connecting tube 58 is provided with a convex ring 581, the fourth latch 57 is provided at a nozzle of the connecting tube 58 at one end of the convex ring 581, the other end of the connecting tube 58 is inserted into the fourth through hole 511, the convex ring 581 abuts against the third supporting rod 51, and the connecting tube 58 is connected with the third supporting rod 51 and the first connecting rod block 52 through the second connecting pin 56. So that only one second connecting pin 56 can connect the connecting tube 58, the third support bar 51, and the first connecting rod block 52 together.

The fourth clamping block 57 is provided with a second clamping hole 571, the second clamping hole 571 is used for allowing a lock of the box body of the first LED display screen to extend into, and the fourth clamping block 57 is used for clamping the lock of the box body of the first LED display screen. Thus, the middle support rod component 5 can also be spliced with the first LED display screen to play a role in connection.

In this embodiment, the middle support rod assembly 5 includes a third connecting pin 59, one end of the first sleeve 551 at the second opening is inserted into the fourth through hole 511 of the third support rod 51, and the first sleeve 551 is connected to the third support rod 51 and the second connecting rod block 53 through the third connecting pin 59. Thus, only one third connecting pin 59 can connect the first sleeve 551, the third support rod 51 and the second connecting rod block 53 together.

The above description is only exemplary of the present invention and should not be taken as limiting the scope of the present invention, as any modifications, equivalents, improvements and the like made within the spirit and principles of the present invention should be included in the present invention.

Claims

1. A back frame is characterized by comprising a left supporting rod assembly, a right supporting rod assembly and a middle supporting rod assembly;

the left support rod assembly comprises a first connecting rod and a second connecting rod, the right support rod assembly comprises a right connecting rod and a first rotating mechanism, one end of the first connecting rod is connected with the first connecting block, the other end of the first connecting rod is connected with the middle support rod assembly, one end of the second connecting rod is connected with the first lock body, the other end of the second connecting rod is connected with the middle support rod assembly, the first rotating mechanism is arranged on the second connecting block, the second connecting block is located between the second lock bodies, one end of the right connecting rod is connected with the first rotating mechanism, and the other end of the right connecting rod is connected with the middle support rod assembly.

2. The back frame according to claim 1, wherein the left support rod assembly comprises a first rotating block and a first rotating shaft, the first lock body is provided with a first rotating groove, a fourth clamping groove and a first rotating hole, the first rotating hole is communicated with the first rotating groove, the fourth clamping groove is formed in a side wall of the first rotating groove and corresponds to the first rotating hole, the first rotating block comprises a first inserting portion and a first connecting portion, the first inserting portion is provided with a first shaft hole, the first inserting portion is inserted into the first rotating groove, the first rotating shaft is connected with the first rotating hole and penetrates through the first shaft hole to be inserted into the fourth clamping groove, and one end of the first connecting rod is connected with the first connecting portion.

3. The back frame of claim 2, wherein the first connecting portion is provided with a first indexing pin, the first lock body is provided with a first rotary slot and a second rotary slot, the first indexing pin is snapped into the first rotary slot when the first rotary block is rotated to a first rotary position, and the first indexing pin is snapped into the second rotary slot when the first rotary block is rotated to a second rotary position.

4. The back frame according to claim 1, wherein the left support rod assembly comprises a second rotating block and a second rotating shaft, the first connecting block is provided with a second rotating groove, a fifth clamping groove and a second rotating hole, the second rotating hole is communicated with the second rotating groove, the fifth clamping groove is formed in a side wall of the second rotating groove and corresponds to the second rotating hole, the second rotating block comprises a second inserting portion and a second connecting portion, the second inserting portion is provided with a second shaft hole, the second inserting portion is inserted into the second rotating groove, the second rotating shaft is connected with the second rotating hole and penetrates through the second shaft hole to be inserted into the fifth clamping groove, and one end of the second connecting rod is connected with the second connecting portion.

5. The back frame of claim 4, wherein the second connecting portion is provided with a second indexing pin, the first connecting block is provided with a third rotary slot and a fourth rotary slot, the second indexing pin is snapped into the third rotary slot when the second rotary block is rotated to a third rotary position, and the second indexing pin is snapped into the fourth rotary slot when the second rotary block is rotated to a fourth rotary position.

6. The back frame of claim 1, wherein the first rotating mechanism comprises a first rotating member, a first limiting ring and a second limiting ring, the first limiting ring and the second limiting ring are sleeved on the second support rod, the first rotating member is rotatably sleeved on the second support rod and is located between the first limiting ring and the second limiting ring, one end of the first rotating member abuts against the first limiting ring, the other end of the first rotating member abuts against the second limiting ring, the first rotating member is provided with a third connecting portion, and the third connecting portion is connected with the right connecting rod.

7. The back frame according to claim 6, wherein the first rotary member is provided with a third indexing pin, the first rotary member is provided with a fifth rotary catch and a sixth rotary catch, the third indexing pin is snapped into the fifth rotary catch when the first rotary member is rotated to a fifth rotary position, and the third indexing pin is snapped into the sixth rotary catch when the first rotary member is rotated to a sixth rotary position.

8. The back frame according to claim 1, wherein the right connecting rod comprises a first rod, a second rod and a rotating mechanism, the rotating mechanism comprises a first rotating block, a second rotating block and a rotating shaft, a rotating insertion block is arranged on one side wall of the first rotating block, the other side wall of the first rotating block is connected with one end of the first rod, the other end of the first rod is connected with the middle supporting rod assembly, a rotating groove is formed in one side wall of the second rotating block, the other side wall of the second rotating block is connected with one end of the second rod, the other end of the second rod is connected with the middle supporting rod assembly, a rotating hole is formed in the second rotating block, the rotating hole is communicated with the rotating groove, a shaft hole is formed in the rotating insertion block, the rotating insertion block is inserted into the rotating groove, and the rotating shaft is connected with the rotating hole and penetrates through the shaft hole.

9. The back frame of claim 8, wherein the rotation mechanism comprises a fourth indexing pin, the fourth indexing pin is disposed on the second rotation block, the rotation insert block is disposed with a third rotation slot, and the fourth indexing pin is inserted into the third rotation slot when the first rotation block is rotated to a third rotation position.