CN112260135B

CN112260135B - Magnesium-aluminum alloy lifting type live crossing frame

Info

Publication number: CN112260135B
Application number: CN202011135432.5A
Authority: CN
Inventors: 亓瑞卿; 亓鹏; 亓伟; 刘燕; 费海琴
Original assignee: Shandong Xicheng Electric Power Construction Co ltd
Current assignee: Shandong Xicheng Electric Power Construction Co ltd
Priority date: 2020-10-21
Filing date: 2020-10-21
Publication date: 2021-10-22
Anticipated expiration: 2040-10-21
Also published as: CN112260135A

Abstract

The utility model relates to an electrified crossing structure of magnadure over-and-under type, the technical field who relates to electric power construction, it includes vertical truss and a plurality of horizontal truss, horizontal truss passes through actuating mechanism and is connected with vertical truss rotation, actuating mechanism includes harmonic gear group and drive gear, drive gear sets up on vertical truss, harmonic gear group includes the flexbile gear, steel wheel and rotation wheel, it connects on horizontal truss to rotate the wheel, flexbile gear fixed connection is on horizontal truss, the rigid wheel rotates to be connected on horizontal truss, the tooth has also been seted up on the outer peripheral face of rigid wheel, rigid wheel and drive gear external toothing. According to the vertical truss erecting method, the vertical truss can be erected by rotating the rotating wheels by an operator; and when erecting the vertical truss, only one operator is needed to operate the rotating wheel, so that the labor is saved, and the construction difficulty is reduced.

Description

Magnesium-aluminum alloy lifting type live crossing frame

Technical Field

The application relates to the field of electric power construction, in particular to a magnesium-aluminum alloy lifting type live crossing frame.

Background

The crossing frame is a facility for enabling a current lead to pass through safely and smoothly in circuit construction. In the construction of the power transmission line, various obstacles such as crossing roads, railways, broadcasting lines, power lines and the like are often encountered, and in order to prevent the lead from being damaged and not influence the safe operation of the crossed objects, crossing frames are erected at the crossed crossing positions before paying off so that the lead can safely and smoothly pass through.

At present, the Chinese utility model patent with the announcement date of 2016, 10 months and 12 days and the announcement number of CN205646624U provides a portable crossing frame with 10kv and below, which comprises a horizontal truss, a central connecting block, a vertical truss and a rotary cross arm; at most four horizontal trusses are detachably connected with the front end face, the rear end face, the left end face and the right end face of the central connecting block; the vertical truss is detachably arranged on the top surface of the central connecting block; the rotary cross arm is connected with the top end of the vertical truss through the fixing seat.

When the anti-toppling device is used, the vertical truss plays a main supporting role, the horizontal truss is fixedly connected to the bottom end of the vertical truss through the center connecting block to play a certain anti-toppling role, and the rotary cross arm is fixedly connected to the top end of the vertical truss through the fixing seat to mainly play a role in erecting electric wires.

In view of the above-mentioned related technologies, the inventor believes that the location where the spanning frame is erected is far away and the terrain is rugged, which is inconvenient for using large auxiliary tools, so that the spanning frame is mainly supported by manual construction, and the vertical truss is long in length, not easy to erect and difficult to construct.

Disclosure of Invention

In order to reduce the construction degree of difficulty of erectting the crossing structure, this application provides a magnadure over-and-under type electrified crossing structure.

The application provides a magnalium lifting type live crossing frame adopts following technical scheme:

the utility model provides an electrified crossing structure of magnadure over-and-under type, includes vertical truss and a plurality of horizontal truss, horizontal truss pass through actuating mechanism with vertical truss rotates to be connected, actuating mechanism includes harmonic gear group and drive gear, drive gear sets up on the vertical truss, harmonic gear group includes flexbile gear, rigid gear and rotates the wheel, it rotates to rotate the wheel and connects on the horizontal truss, flexbile gear fixed connection be in on the horizontal truss, the rigid gear rotates to be connected on the horizontal truss, the tooth has also been seted up on the outer peripheral face of rigid gear, the rigid gear with drive gear external toothing.

By adopting the technical scheme, when the crossing frame is in a retracted state, the vertical trusses and the horizontal trusses are kept parallel to each other, and the vertical trusses are wrapped in the center by the horizontal trusses, so that the occupied space is saved, and the transportation is facilitated; when the crossing frame is conveyed to an erection site, the crossing frame is placed on the ground, a horizontal truss touches the ground, a vertical truss does not touch the ground, then a rotating wheel of a harmonic gear set is rotated, a rigid wheel is rotated under the drive of a flexible wheel, and the horizontal truss and the vertical truss rotate relatively due to the fact that the rigid wheel is meshed with the outer portion of a driving gear, so that the vertical truss is erected; and when erecting the vertical truss, only one operator is needed to operate the rotating wheel, so that the labor is saved, and the construction difficulty is reduced.

Optionally, the driving gear is rotatably connected to the vertical truss, a positioning assembly used for locking the driving gear is further arranged on the vertical truss, the positioning assembly comprises positioning pins, the positioning pins are connected with the vertical truss in a sliding mode, positioning holes are formed in the driving gear, the positioning pins can be inserted into the positioning holes, the number of the horizontal trusses is four, and the four horizontal trusses are evenly arranged on the periphery of the vertical truss.

By adopting the technical scheme, before the horizontal trusses are erected, the two horizontal trusses on two sides of the horizontal truss which contacts the ground are unfolded, when the two horizontal trusses are unfolded, the corresponding positioning pins are taken out of the positioning holes, the corresponding driving gears can rotate relative to the vertical trusses, the two horizontal trusses can be rotated, when the two horizontal trusses are rotated, the gravity centers of the two horizontal trusses do not move up and down, and the operation of an operator is facilitated; after the two horizontal trusses are completely unfolded, the corresponding positioning pins are inserted into the positioning holes, and then the horizontal truss which contacts the ground is unfolded, so that the vertical truss is not prone to side tilting, and the safety of erecting the crossing frame is improved.

Optionally, the positioning assembly further comprises a spring, one end of the spring is connected with the positioning pin, the other end of the spring is connected with the vertical truss, and a first guide surface is arranged at one end, close to the driving gear, of the positioning pin.

By adopting the technical scheme, when the two horizontal trusses on the two sides of the horizontal truss which contacts the ground are unfolded, the corresponding positioning pins do not need to be pulled out of the positioning holes, an operator can directly rotate the two horizontal trusses, the positioning pins can be automatically popped out of the positioning holes under the action of the first guide surface, and the positioning pins can be automatically inserted into the positioning holes under the action of the springs when the horizontal trusses are folded; and when the harmonic gear set is used for unfolding the horizontal truss, the positioning pin is not easy to be separated from the positioning hole under the action of the spring, so that the safety of unfolding the horizontal truss is improved.

Optionally, a first locking assembly used for locking the horizontal truss is arranged on the horizontal truss, the first locking assembly comprises a first locking block and a first locking rod, the first locking block is rotatably connected to the horizontal truss, the first locking rod is fixedly connected to the vertical truss, a first locking groove is formed in the first locking block, and the first locking groove can be connected with the first locking rod in a clamped mode.

Through adopting above-mentioned technical scheme, after horizontal truss expandes completely, vertical truss is erect completely, rotates first locking piece this moment, makes first locking bar joint in first locking groove, and horizontal truss just can't reverse rotation again so, has reduced the probability that vertical truss emptys.

Optionally, the first locking assembly further comprises a first torsion spring, one end of the first torsion spring is connected with the first locking block, and the other end of the first torsion spring is connected with the horizontal truss.

Through adopting above-mentioned technical scheme, in first locking lever joint income first locking groove back, under first torsion spring's effect, make first locking lever be difficult for deviating from first locking groove, and then improved first locking subassembly's reliability, reduced the probability that vertical truss emptys.

Optionally, a second guide surface is formed at one end of the first locking block close to the first locking rod, the first locking rod can abut against the second guide surface and slide relatively, and the first locking rod is clamped into the first locking groove under the guidance of the second guide surface.

By adopting the technical scheme, when the horizontal truss is about to be completely unfolded, the first locking rod is abutted against the second guide surface, the first locking rod slides on the second guide surface along with the continuous opening of the horizontal truss, the first locking block and the horizontal truss rotate relatively at the moment, the first torsion spring is pressed, when the horizontal truss is completely unfolded, the first locking rod slides into the first locking groove, and under the action of the first torsion spring, the first locking rod is clamped in the first locking groove; therefore, an operator does not need to operate the first locking assembly when unfolding the horizontal truss, the spanning frame can be conveniently erected by the operator, and labor force is saved.

Optionally, an anti-tilt mechanism for preventing the vertical truss from tilting is further disposed on the horizontal truss, the anti-tilt mechanism includes two anti-tilt trusses, one of the two anti-tilt trusses is disposed on the horizontal truss in a corresponding manner, the anti-tilt truss is rotatably connected to one end of the horizontal truss, which is far away from the vertical truss, and when the anti-tilt truss is unfolded, the anti-tilt truss is perpendicular to both the horizontal truss and the vertical truss.

By adopting the technical scheme, after the vertical trusses are erected, the anti-tilting trusses on all the unfolded horizontal trusses are unfolded, and then the last horizontal truss is unfolded, so that the anti-tilting trusses can apply anti-tilting moment to the horizontal trusses and the vertical trusses, the probability of tilting of the vertical trusses due to gravity center movement is reduced when the last horizontal truss is unfolded, and the safety is improved.

Optionally, the anti-tilting mechanism further comprises a second locking assembly for locking the anti-tilting truss, the second locking assembly comprises a second locking block and a second locking rod, the second locking block is rotatably connected to the anti-tilting truss, the second locking rod is fixedly connected to the horizontal truss, a second locking groove is formed in the second locking block, and the second locking groove can be connected with the second locking rod in a clamped mode.

Through adopting above-mentioned technical scheme, expand the anti-truss of inclining after vertical truss is erect completely, when the anti-truss of inclining expandes completely, second locking lever joint is in the second locking groove, and anti-truss of inclining just so can't the antiport again, has improved the stability of anti-truss of inclining, and then has reduced the probability that vertical truss emptys.

In summary, the present application includes at least one of the following beneficial technical effects:

1. through the arrangement of the driving mechanism, an operator can erect the vertical truss by rotating the rotating wheels; and when erecting the vertical truss, only one operator is needed to operate the rotating wheel, so that the labor is saved, and the construction difficulty is reduced.

2. Through locating component's setting, take out the locating pin that corresponds from the locating hole, corresponding drive gear alright with take place relative rotation with vertical truss, if horizontal truss's focus does not take place to reciprocate, the horizontal truss of alright manual rotation of operation workman this moment, the operating personnel of being convenient for operates.

3. Through the setting of first locking Assembly, after the horizontal truss expandes completely, vertical truss is erect completely, rotates first locking piece this moment, makes first locking lever joint in first locking groove, and horizontal truss just can't the antiport so, has reduced the probability that vertical truss emptys.

4. Through the setting of second locking Assembly, expand the anti truss of inclining after vertical truss is erect completely, when the anti truss of inclining expandes completely, second locking lever joint is in the second locking groove, and the anti truss of inclining just can't reverse rotation again so, has improved the stability of anti truss of inclining, and then has reduced the probability that vertical truss emptys.

Drawings

FIG. 1 is a schematic diagram of the overall structure of an embodiment of the present application;

FIG. 2 is a schematic view of a driving mechanism and the structure of the vicinity thereof according to the embodiment of the present application;

FIG. 3 is an exploded cross-sectional view of a harmonic gear set and nearby structures according to an embodiment of the present application;

FIG. 4 is a schematic view showing the structure of a drive gear and its vicinity according to the embodiment of the present application;

fig. 5 is an enlarged schematic view of a portion a in fig. 2.

Description of reference numerals: 100. a vertical truss; 110. a first-stage vertical truss; 120. a second stage vertical truss; 130. a third-stage vertical truss; 140. a fourth-stage vertical truss; 200. a horizontal truss; 210. an outer support; 211. a rotating shaft; 220. an inner support; 300. rotating the cross arm; 400. a drive mechanism; 410. a harmonic gear set; 411. a rigid wheel; 412. a flexible gear; 413. a rotating wheel; 420. a drive gear; 421. positioning holes; 430. a drive motor; 440. a drive sprocket; 450. a driven sprocket; 460. a chain; 470. a thrust bearing; 500. a positioning assembly; 510. positioning pins; 511. a first guide surface; 512. a limiting plate; 520. a compression spring; 600. a first locking assembly; 610. a first locking block; 620. a first locking lever; 630. a first locking groove; 640. a first torsion spring; 650. a second guide surface; 660. a first stopper; 700. an anti-tilt mechanism; 710. an anti-roll truss; 720. a second locking assembly; 721. a second locking block; 722. a second locking lever; 723. a second locking slot; 724. a second torsion spring; 725. a third guide surface; 726. and a second limiting block.

Detailed Description

The present application is described in further detail below with reference to figures 1-5.

The embodiment of the application discloses a magnesium-aluminum alloy lifting type live crossing frame. Referring to fig. 1, the magnesium-aluminum alloy lifting type live crossing frame comprises a horizontal truss 200 for resisting overturning, a rotary cross arm 300 for supporting electric wires and a telescopic vertical truss 100 for supporting the rotary cross arm 300.

Referring to fig. 1, the telescopic vertical truss 100 is provided with a plurality of stages, and the telescopic vertical truss 100 in this embodiment is provided with four stages, namely, a first-stage vertical truss 110, a second-stage vertical truss 120, a third vertical truss 100 and a fourth vertical truss 100 from outside to inside in sequence. The bottom end of the first-stage vertical truss 110 is fixedly connected to the base through a bolt, the second-stage vertical truss 120 is connected with the first-stage vertical truss 110 in a sliding mode, the third vertical truss 100 is connected with the second-stage vertical truss 120 in a sliding mode, and the fourth vertical truss 100 is connected with the third vertical truss 100 in a sliding mode; the rotary cross arm 300 is rotatably connected to the top end of the fourth vertical girder 100, and the rotary shaft 211 between the rotary cross arm 300 and the fourth vertical girder 100 is coaxial with the center line of the fourth vertical girder 100.

Referring to fig. 1, a horizontal truss 200 includes an outer bracket 210 and an inner bracket 220, wherein one end of the outer bracket 210 is fixedly connected to a base through a bolt, and the inner bracket 220 is slidably connected to the outer bracket 210 along the length direction of the outer bracket 210. The horizontal truss 200 is provided with a plurality ofly, and horizontal truss 200 is provided with four in this embodiment, and four horizontal truss 200 equipartitions set up on the base. In order to reduce the weight of the spanning frame and facilitate the operation and construction of operators, the telescopic vertical truss 100 and the horizontal truss 200 are both in a lattice form, and the telescopic vertical truss 100 and the horizontal truss 200 are both made of aluminum magnesium alloy.

Referring to fig. 1 and 2, the outer frame 210 is rotatably connected to the lower end of the first-stage vertical truss 110 through a rotating shaft 211, and the outer frame 210 is provided with four driving mechanisms 400 for driving the first-stage vertical truss 110 to rotate, wherein one driving mechanism 400 corresponds to one horizontal truss 200. Drive mechanism 400 includes a harmonic gear set 410 and a drive gear 420, drive gear 420 being disposed on first stage vertical truss 110 and the harmonic gear being disposed on outer support frame 210.

Referring to fig. 2 and 3, the harmonic gear includes a rigid gear 411, a flexible gear 412 and a rotating gear 413, wherein an axial center of the flexible gear 412 is parallel to an axial center of the rotating shaft 211, and two axial ends of the flexible gear 412 are fixedly connected to the outer frame 210 by screws. The rotating wheel 413 is coaxially arranged in the flexible wheel 412 in a penetrating way, the rotating wheel 413 is rotatably connected to the outer support 210 along the self axis, and the rotating wheel 413 is in rolling connection with the inner wall of the flexible wheel 412. The rigid gear 411 is coaxially sleeved outside the flexible gear 412, and an inner gear ring of the rigid gear 411 is meshed with an outer gear ring of the flexible gear 412.

Referring to fig. 3 and 4, the driving gear 420 is coaxially disposed with the rotation shaft 211, the driving gear 420 is rotatably coupled to the first-stage vertical girder 110 along its axis, and the rotation of the driving gear 420 is restricted by the positioning assembly 500. Teeth are also formed on the outer circumferential surface of the rigid gear 411, and the rigid gear 411 is externally engaged with the driving gear 420. Thrust bearings 470 are arranged at two axial ends of the rigid gear 411, the thrust bearings 470 are sleeved outside the flexible gear 412, and the thrust bearings 470 are clamped between the rigid gear 411 and the outer bracket 210.

When the crossing frame is in a retracted state, the vertical truss 100 and the horizontal truss 200 are kept parallel to each other, and the plurality of horizontal trusses 200 wrap the vertical truss 100 at the center; when the spanning frame is transported to the erection site and then placed on the ground, a horizontal truss 200 is grounded and the vertical truss 100 is not grounded, then the rotating wheel 413 of the harmonic gear set 410 is rotated, the rigid wheel 411 is rotated under the drive of the flexible wheel 412, and the rigid wheel 411 is externally meshed with the driving gear 420, and the positioning assembly 500 limits the rotation of the driving gear 420, so that the horizontal truss 200 and the vertical truss 100 rotate relatively along the axis of the rotating shaft 211, and the vertical truss 100 is erected.

Referring to fig. 2 and 3, the driving mechanism 400 further includes a driving motor 430, a driving sprocket 440, a driven sprocket 450 and a chain 460, the driven sprocket 450 is coaxially connected to the rotating wheel 413, the driving sprocket 440 is rotatably connected to an end of the outer frame 210 away from the first-stage vertical truss 110, and the chain 460 is sleeved on the driving sprocket 440 and the driven sprocket 450. The driving motor 430 is detachably and fixedly connected to the outer frame 210 through bolts, and an output shaft of the driving motor 430 is coaxially and fixedly connected with the driving sprocket 440 through a coupling. When the vertical truss 100 is erected, the driving motor 430 rotates and drives the rotating wheel 413 to rotate under the driving of the driving sprocket 440, the chain 460 and the driven sprocket 450.

In the area where power is inconvenient to be supplied, the driving motor 430 can be detached from the outer support 210, and a crank is coaxially and fixedly connected to the driving sprocket 440 through a coupling, so that an operator can also erect the vertical truss 100 by rotating the crank. When the vertical truss 100 is erected, only one operator needs to operate the driving motor 430 or the crank, so that the labor is saved, and the construction difficulty is reduced.

Referring to fig. 2 and 4, the positioning assembly 500 includes a positioning pin 510 limiting rotation of the driving gear 420 and a spring for restoring the positioning pin 510. The axis of the positioning pin 510 is parallel to the axis of the rotating shaft 211, and the positioning pin 510 is connected to the first-stage vertical truss 110 in a sliding manner along the axis thereof. The driving gear 420 is provided with a plurality of positioning holes 421, the positioning pins 510 can be inserted into the positioning holes 421, and when the positioning pins 510 are inserted into the positioning holes 421, the driving gear 420 cannot rotate relative to the first-stage vertical truss 110.

Referring to fig. 2 and 4, a first guide surface 511 is formed at one end of the positioning pin 510 close to the driving gear 420, and a limit plate 512 is further screwed at one end of the positioning pin 510 close to the driving gear 420. The spring is compression spring 520, and compression spring 520 overlaps on locating pin 510, and compression spring 520's one end and limiting plate 512 butt, and compression spring 520's the other end and the vertical truss 110 butt of first order. When outer bracket 210 rotates away from vertical truss 100, positioning pin 510 will be pulled out from positioning hole 421 by first guiding surface 511; when outer bracket 210 is rotated toward vertical truss 100, positioning pin 510 is inserted into positioning hole 421 by compression spring 520.

Before erecting the horizontal truss 200, firstly unfolding the two horizontal trusses 200 on both sides of the horizontal truss 200 which contacts the ground, when unfolding the two horizontal trusses 200, the positioning pin 510 can automatically pop out from the positioning hole 421, and when rotating the two horizontal trusses 200, the gravity centers of the two horizontal trusses 200 do not move up and down, thereby being convenient for the operation of operators; after the two horizontal trusses 200 are completely unfolded, the corresponding positioning pins 510 are inserted into the positioning holes 421 again under the action of the compression springs 520, and the two horizontal trusses 200 cannot rotate in a direction close to the first-stage vertical truss 110, and then the horizontal trusses 200 touching the ground are unfolded, so that the vertical trusses 100 are not prone to roll, and the safety in erecting the spanning frame is improved.

Referring to fig. 2 and 4, a first locking assembly 600 for locking the horizontal truss 200 is disposed on the horizontal truss, and the first locking assembly 600 includes a first locking block 610, a first locking rod 620, a first torsion spring 640, and a first limiting block 660. First locking block 610 is rotatably connected to horizontal truss 200, and first locking groove 630 and second guide surface 650 are opened at one end of first locking block 610 far from outer bracket 210, and first locking rod 620 is welded to vertical truss 100. One end of first torsion spring 640 is engaged with first locking block 610, and the other end of first torsion spring 640 is engaged with outer holder 210.

When the vertical truss 100 is to be completely erected, the second guide surface 650 abuts against the outer peripheral surface of the first locking bar 620, and then the vertical truss 100 continues to be erected, the first locking block 610 rotates under the action of the second guide surface 650, and when the vertical truss 100 is completely erected, the first locking block 610 reversely rotates under the action of the first torsion spring 640, and the first locking bar 620 is clamped in the first locking groove 630. Therefore, the vertical truss 100 is not easy to reversely rotate, the probability of toppling over the vertical truss 100 is reduced, and the safety is improved.

Referring to fig. 2 and 4, the first stopper 660 is welded to the outer frame 210, and when the vertical truss 100 is not completely erected, the first locking block 610 abuts against the first stopper 660 by the first torsion spring 640, so that the position of the first locking block 610 is limited, and the first locking rod 620 abuts against the second guide surface 650.

Referring to fig. 2 and 5, the horizontal girder 200 is further provided with an anti-tilt mechanism 700 for preventing the vertical girder 100 from tilting, the anti-tilt mechanism 700 includes anti-tilt girders 710, and two anti-tilt girders 710 are correspondingly provided to one horizontal girder 200. The anti-roll truss 710 is pivotally connected to the end of the inner frame 220 remote from the vertical truss 100 and when the anti-roll truss 710 is deployed, the anti-roll truss 710 is perpendicular to both the horizontal truss 200 and the vertical truss 100.

After the vertical trusses 100 are erected, the anti-tilt trusses 710 on all the unfolded horizontal trusses 200 are unfolded, and then the last horizontal truss 200 is unfolded, so that the anti-tilt trusses 710 can apply anti-tilt moment to the horizontal trusses 200 and the vertical trusses 100, the probability that the vertical trusses 100 are toppled due to the movement of the center of gravity is reduced when the last horizontal truss 200 is unfolded, and the safety is improved.

Referring to fig. 2 and 5, the anti-roll mechanism 700 further includes a second locking assembly 720 for locking the anti-roll truss 710, and the second locking assembly 720 includes a second locking block 721, a second locking lever 722, a second torsion spring 724, and a second stopper 726. The second locking block 721 is rotatably connected to the anti-tilt truss 710, a second locking groove 723 and a third guiding surface 725 are formed at one end of the second locking block 721 away from the anti-tilt truss 710, and a second locking lever 722 is welded on the inner bracket 220. The second torsion spring 724 has a second locking block 721 clamped thereto, and the other end of the second torsion spring 724 is clamped to the inner bracket 220.

The anti-roll truss 710 is unfolded after the vertical truss 100 is completely erected, when the anti-roll truss 710 is not completely unfolded, the second locking lever 722 abuts on the third guide surface 725, the second locking block 721 rotates under the action of the third guide surface 725, and when the anti-roll truss 710 is completely unfolded, the second locking block 721 reversely rotates under the action of the second torsion spring 724, and the second locking lever 722 is clamped in the second locking groove 723. Thus, the anti-tilting truss 710 is not easy to rotate reversely, the probability of tilting the vertical truss 100 is reduced, and the safety is improved.

Referring to fig. 2 and 5, the second stopper 726 is welded to the anti-roll truss 710, and when the anti-roll truss 710 is not completely unfolded, the second locking block 721 abuts against the second stopper 726 under the action of the second torsion spring 724, so that the position of the second locking block 721 is limited, and the second locking lever 722 abuts against the third guide surface 725.

The implementation principle of the magnesium-aluminum alloy lifting type live crossing frame in the embodiment of the application is as follows:

in the initial state, the vertical girders 100, the horizontal girders 200, and the anti-roll girders 710 are all parallel to each other, and when the spanning frame is transferred to the supporting position, one of the horizontal girders 200 is in a touchdown state. Before erecting the horizontal truss 200, firstly unfolding the two horizontal trusses 200 on both sides of the horizontal truss 200 which contacts the ground, when unfolding the two horizontal trusses 200, the positioning pin 510 can automatically pop out from the positioning hole 421, and when rotating the two horizontal trusses 200, the gravity centers of the two horizontal trusses 200 do not move up and down, thereby being convenient for the operation of operators; after the two horizontal trusses 200 are completely unfolded, the corresponding positioning pins 510 are inserted into the positioning holes 421 again under the action of the compression springs 520, and the two horizontal trusses 200 cannot rotate in the direction close to the first-stage vertical truss 110, and then the horizontal trusses 200 touching the ground are unfolded, so that the vertical trusses 100 are not prone to roll, and the safety in erecting the spanning frame is improved; after the vertical trusses 100 are erected, the anti-tilt trusses 710 on all the unfolded horizontal trusses 200 are unfolded, and then the last horizontal truss 200 is unfolded, so that the anti-tilt trusses 710 can apply anti-tilt moment to the horizontal trusses 200 and the vertical trusses 100, the probability that the vertical trusses 100 are toppled due to the movement of the center of gravity is reduced when the last horizontal truss 200 is unfolded, and the safety is improved.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims

1. The utility model provides a magnadure over-and-under type electrified spanning frame which characterized in that: the vertical truss structure comprises a vertical truss (100) and a plurality of horizontal trusses (200), wherein the horizontal trusses (200) are rotationally connected with the vertical truss (100) through a driving mechanism (400), the driving mechanism (400) comprises a harmonic gear set (410) and a driving gear (420), the driving gear (420) is arranged on the vertical truss (100), the harmonic gear set (410) comprises a flexible gear (412), a rigid gear (411) and a rotating gear (413), the rotating gear (413) is rotationally connected onto the horizontal truss (200), the flexible gear (412) is fixedly connected onto the horizontal truss (200), the rigid gear (411) is rotationally connected onto the horizontal truss (200), teeth are also arranged on the outer peripheral surface of the rigid gear (411), and the rigid gear (411) is externally meshed with the driving gear (420); the driving gear (420) is rotatably connected to the vertical truss (100), a positioning assembly (500) used for locking the driving gear (420) is further arranged on the vertical truss (100), the positioning assembly (500) comprises positioning pins (510), the positioning pins (510) are connected with the vertical truss (100) in a sliding mode, positioning holes (421) are formed in the driving gear (420), the positioning pins (510) can be inserted into the positioning holes (421), four horizontal trusses (200) are arranged, and the four horizontal trusses (200) are evenly arranged on the periphery of the vertical truss (100).

2. The magnesium-aluminum alloy lifting type live crossover frame of claim 1, wherein: the positioning assembly (500) further comprises a spring, one end of the spring is connected with the positioning pin (510), the other end of the spring is connected with the vertical truss (100), and a first guide surface (511) is formed in one end, close to the driving gear (420), of the positioning pin (510).

3. The magnesium-aluminum alloy lifting type live crossover frame of claim 1 or 2, wherein: be provided with first locking Assembly (600) that is used for locking itself on horizontal truss (200), first locking Assembly (600) include first locking piece (610) and first locking pole (620), first locking piece (610) rotate to be connected on horizontal truss (200), first locking pole (620) fixed connection be in on vertical truss (100), first locking groove (630) have been seted up on first locking piece (610), first locking groove (630) can with first locking pole (620) joint.

4. The magnesium-aluminum alloy lifting type live crossover frame of claim 3, wherein: the first locking assembly (600) further includes a first torsion spring (640), one end of the first torsion spring (640) is connected with the first locking block (610), and the other end of the first torsion spring (640) is connected with the horizontal truss (200).

5. The magnesium-aluminum alloy lifting type live crossover frame of claim 4, wherein: a second guide surface (650) is formed in one end, close to the first locking rod (620), of the first locking block (610), the first locking rod (620) can be abutted to the second guide surface (650) and can slide relatively, and the first locking rod (620) is clamped into the first locking groove (630) under the guide of the second guide surface (650).

6. The magnesium-aluminum alloy lifting type live crossover frame of claim 3, wherein: the anti-tilting mechanism (700) for preventing the vertical truss (100) from tilting is further arranged on the horizontal truss (200), the anti-tilting mechanism (700) comprises anti-tilting trusses (710), one horizontal truss (200) is correspondingly provided with two anti-tilting trusses (710), the anti-tilting trusses (710) are rotatably connected to one ends, far away from the vertical truss (100), of the horizontal truss (200), and when the anti-tilting trusses (710) are unfolded, the anti-tilting trusses (710) are perpendicular to the horizontal truss (200) and the vertical truss (100).

7. The magnesium-aluminum alloy lifting type live crossover frame of claim 6, wherein: the anti-tilt mechanism (700) further comprises a second locking assembly (720) used for locking the anti-tilt truss (710), the second locking assembly (720) comprises a second locking block (721) and a second locking rod (722), the second locking block (721) is rotatably connected to the anti-tilt truss (710), the second locking rod (722) is fixedly connected to the horizontal truss (200), a second locking groove (723) is formed in the second locking block (721), and the second locking groove (723) can be clamped with the second locking rod (722).