CN211077363U - Folding rack for folding conveyor - Google Patents

Abstract

The utility model discloses a folding leg for folding conveyor, install the carriage on the base including base and articulated, install on the base and be used for driving the overturning driving device of carriage upset between fold condition and expansion state, overturning driving device includes that articulated portal frame of installing on the base and install the hoist subassembly on the base, the hoist subassembly passes through the tractive rope and links to each other with the portal frame, the portal frame links to each other with the carriage through flexible tractive part, overturning driving device still includes more than one and is used for driving the carriage upset and enables the carriage and keep the rigidity tilting mechanism at arbitrary rotation angle, rigidity tilting mechanism and carriage link to each other through dismantling coupling assembling. The folding frame has the advantages of simple structure, low cost, easy manufacture and assembly, high safety and reliability and the like.

Description

Folding rack for folding conveyor

Technical Field

The utility model relates to a carry and equip technical field, concretely relates to a folding leg for foldable conveyor.

Background

In a folding conveyor, a gantry-type turnover driving device is commonly used to drive a conveying frame to turn and fold. The existing gantry type overturning driving device comprises a gantry frame, a hydraulic oil cylinder and a hoisting assembly, wherein the gantry frame is hinged to a base, the hydraulic oil cylinder is arranged on the base and drives the gantry frame to rotate, the hoisting assembly is arranged on the base, and a steel wire rope of the hoisting assembly bypasses the gantry frame to be connected with a conveying frame so as to transfer the conveying frame or pull the conveying frame to enable the conveying frame to be attached to the gantry frame. When the gantry crane works, the hydraulic oil cylinder drives the gantry to swing to an angle smaller than or equal to 90 degrees relative to the ground, and then the conveying frame is placed down or pulled up through the hoisting assembly. When the conveying frame is placed or pulled up, the vertical angle of the portal frame is required to be less than or equal to 90 degrees, if the vertical angle is greater than 90 degrees, the conveying frame can freely fall down due to self weight, and safety accidents such as breakage and deformation of the belt frame are easy to happen. However, when the hydraulic oil cylinder is controlled to drive the portal frame to rotate, the portal frame is easy to swing to a position more than 90 degrees relative to the ground due to improper operation, and then safety accidents are caused.

SUMMERY OF THE UTILITY MODEL

The to-be-solved technical problem of the utility model is to overcome the not enough of prior art existence, provide a simple structure, with low costs, easily preparation assembly, fail safe nature is high is used for foldable conveyor's folding leg.

In order to solve the technical problem, the utility model discloses a following technical scheme:

the utility model provides a folding leg for folding conveyor, includes base and articulated carriage of installing on the base, install on the base and be used for driving the upset drive arrangement of carriage upset between fold condition and expansion state, the upset drive arrangement includes articulated portal frame of installing on the base and installs the hoist assembly on the base, the hoist assembly passes through the tractive rope and links to each other with the portal frame, the portal frame links to each other with the carriage through flexible tractive part, the upset drive arrangement still includes more than one and is used for driving the carriage upset and enables the carriage and keep the rigidity tilting mechanism at arbitrary flip angle, rigidity tilting mechanism and carriage link to each other through dismantling coupling assembling.

As a further improvement of the above technical solution:

rigid turnover mechanism includes that the articulated upset seat of installing on the base with install and be used for driving upset seat pivoted first flexible driving piece on the base, the articulated axis of upset seat with the coincidence of the articulated axis of carriage, upset seat and carriage pass through can dismantle coupling assembling and link to each other.

The detachable connecting assembly comprises a pin hole arranged on the conveying frame and a movable bolt arranged on the turnover seat and capable of being inserted into or withdrawn from the pin hole.

Reinforcing guard beams are arranged on two sides of the conveying frame close to the base, an accommodating space is arranged between each reinforcing guard beam and the conveying frame, the overturning seat is provided with a protruding part which is inserted into the accommodating space when the overturning seat and the conveying frame are connected through a detachable connecting assembly, and the protruding part is provided with a concave hole extending to the inside of the protruding part; the first telescopic driving piece is a telescopic oil cylinder which is hinged to the base, and a telescopic rod of the telescopic oil cylinder is inserted into the concave hole and hinged to the protruding portion.

The reinforced guard beam comprises a guard beam main body, and the guard beam main body is connected to the side surface of the conveying frame through a plurality of transverse connecting pieces and a plurality of inclined supporting pieces; the reinforcing guard beams on the two sides of the conveying frame are connected with hinged lug plates, and the hinged lug plates, the overturning seats and the base are hinged through the same hinged shaft.

The conveying frame comprises a rear frame and a front frame, one end of the rear frame is hinged to the base, the front frame is hinged to the other end of the rear frame, and more than one rotation driving device for driving the front frame to rotate so as to switch between a folded state and an unfolded state is arranged between the rear frame and the front frame; rotate drive arrangement and include triangle box, straight connecting rod and articulated second telescopic driving spare of installing on the after-poppet, the triangle box passes through the connecting piece by two parallel and interval arrangement's obtuse angle triangle board and connects and constitute, obtuse angle triangle board has minor face, long limit and the hypotenuse that length increases in proper order, and the hypotenuse of two obtuse angle triangle boards and the crossing acute angle department in long limit are articulated through first articulated shaft and after-poppet, the one end of straight connecting rod is articulated with the before-poppet, the minor face of two obtuse angle triangle boards and the crossing obtuse angle department in long limit pass through the second articulated shaft with the other end of straight connecting rod is articulated, and the minor face of two obtuse angle triangle boards and the crossing acute angle department of hypotenuse are articulated through the drive end of third articulated shaft and second telescopic.

The front end of the frame body of the front frame is provided with a tensioning mechanism, the tensioning mechanism comprises a roller shaft and two sliding grooves formed in the frame body, a sliding block is arranged in each sliding groove in a sliding mode, the two ends of the roller shaft are respectively and correspondingly arranged on the sliding blocks in the two sliding grooves, two adjusting screw rods used for adjusting the sliding positions of the sliding blocks are arranged on the frame body corresponding to the sliding blocks, and the two adjusting screw rods respectively correspond to the two opposite side faces of the sliding blocks to abut against the two opposite side faces of the sliding blocks.

The portal frame includes two stands of articulated installation on the base, be connected with two piece at least crossbeams between two stands, install on a crossbeam and be used for around establishing the first assembly pulley of tractive rope, another crossbeam is equipped with and is used for around establishing the second assembly pulley of flexible tractive part, and the crossbeam middle part rigid coupling that is equipped with the second assembly pulley has a middle vaulting pole of outside extension, the extension end both sides of middle vaulting pole with all be connected with a side diagonal vaulting pole between the crossbeam.

When the gravity center of the conveying frame and the hinge axis of the conveying frame are located in the same vertical plane, the conveying frame is in a vertical state, the conveying frame is in an intermediate state between the vertical state and an unfolding state, and the flexible traction part is in a tensioning state when the conveying frame is in the intermediate state.

When the conveying frame moves in a folded state and a middle state, the rigid turnover mechanism drives the turnover seat to complete the operation; when the conveying frame moves between the middle state and the unfolding state, the hoisting assembly winds and unwinds the traction rope to drive the portal frame and the flexible traction part to complete the operation.

Compared with the prior art, the utility model has the advantages of:

the utility model discloses a folding leg for folding conveyor is owing to adopted rigidity tilting mechanism and by the hoist subassembly, the flexible tilting mechanism of portal frame and flexible tractive part combination, accessible rigidity tilting mechanism control carriage is changing between angle and the fold condition that can not freely fall (intermediate state) to folding direction, through the conversion of flexible tilting mechanism control carriage between angle and the expansion state that can freely fall, compare in traditional planer-type upset drive arrangement, flexible tilting mechanism adopts the hoist subassembly, the turned angle of carriage is controlled more easily, be difficult for appearing leading to the incident because of improper operation makes carriage turned angle too big, its fail safe nature is high, and this folding leg for folding conveyor has simple structure, and is with low costs, easily make the advantage of assembly.

Drawings

Fig. 1 is a front view structure diagram of the folding frame when the rear frame and the front frame are both in the unfolding state.

Fig. 2 is a front view of the folding frame in a unfolded state of the rear frame and in a folded state of the front frame.

Fig. 3 is a front view structural diagram of the folding frame in the middle state of the conveying frame.

Fig. 4 is a front view structure diagram of the folding frame when the rear frame and the front frame are both in the folding state.

Fig. 5 is a schematic view of a partial top view of the rigid flipping mechanism.

Fig. 6 is a partial front view structural diagram of the rigid turnover mechanism.

Fig. 7 is a schematic perspective view of the flipping base.

Fig. 8 is a partial perspective view of the rotary drive device.

Fig. 9 is a partial front view of the rotation driving device.

Fig. 10 is a front view of the joint between the reinforcing beam and the rear frame.

Fig. 11 is a top view of the connection between the reinforcing beam and the rear frame.

Fig. 12 is a schematic side view of the tensioning mechanism.

Fig. 13 is a schematic cross-sectional structure view of the tensioning mechanism.

Fig. 14 is a schematic perspective view of a gantry.

Illustration of the drawings:

1. a base; 2. a carriage; 201. reinforcing the guard beam; 2011. a main body of the guard beam; 2012. a transverse connector; 2013. a diagonal stay member; 202. hinging the ear plate; 21. a rear frame; 22. a front frame; 23. a straight connecting rod; 24. a second telescoping drive member; 25. an obtuse angle triangular plate; 26. a first hinge shaft; 27. a second hinge shaft; 28. a third hinge shaft; 29. a tensioning mechanism; 291. a roller shaft; 292. a chute; 293. a slider; 294. adjusting the screw rod; 3. a turnover driving device; 31. a gantry; 311. a column; 312. a cross beam; 313. a first pulley block; 314. a second pulley block; 315. a middle stay bar; 316. a side diagonal brace rod; 32. a hoisting assembly; 33. a pulling rope; 34. a flexible pulling member; 35. a turning seat; 351. a projection; 352. concave holes; 353. a side plate; 354. an upper plate; 355. a triangular web; 36. a first telescoping drive member; 38. a movable bolt.

Detailed Description

The present invention will be described in further detail with reference to the following drawings and specific embodiments.

As shown in fig. 1 to 4, the folding leg for a folding conveyor of the present embodiment includes a base 1 and a conveyor frame 2 hinged on the base 1, a turnover driving device 3 for driving the conveyor frame 2 to turn over between a folded state and an unfolded state is installed on the base 1, the turnover driving device 3 includes a portal frame 31 hinged on the base 1 and a hoisting assembly 32 installed on the base 1, the hoisting assembly 32 is connected with the portal frame 31 through a pulling rope 33, the portal frame 31 is connected with the conveyor frame 2 through a flexible pulling member 34, and when the conveyor frame 2 is in a vertical state (a state that a center of gravity of the conveyor frame 2 and a hinge axis of the conveyor frame 2 are located in the same vertical plane) and the unfolded state, the flexible pulling member 34 is in a tensioned state and pulls the conveyor frame 2 so that it does not fall freely. The turnover driving device 3 further includes two rigid turnover mechanisms for driving the transportation frame 2 to turn over and enabling the transportation frame 2 to be switched between the intermediate state and the folded state, and the rigid turnover mechanisms are connected with the transportation frame 2 through detachable connection assemblies.

When the folding frame for the folding conveyor is converted from an unfolding state to a folding state, the portal frame 31 can be driven to rotate by the aid of the hoisting component 32 to lift the conveying frame 2 to an intermediate state (an angle which cannot freely fall down towards the folding direction), the conveying frame 2 is connected with the rigid turnover mechanism through the detachable connecting component and the conveying frame 2 is driven to rotate to a complete folding state, when the folding frame is converted from the folding state to the unfolding state, the conveying frame 2 is driven to rotate to the intermediate state by the rigid turnover mechanism, then the detachable connecting component is disconnected from the conveying frame 2 and the rigid turnover mechanism, the hoisting component 32 releases the traction rope 33 to enable the conveying frame 2 to freely fall down towards the unfolding state, meanwhile, the portal frame 31 is pulled up through the flexible traction part 34, the conveying frame 2, the flexible traction part 34 and the portal frame 31 form a fixed triangle, the rolling and working angles of the conveying frame 2 can be flexibly adjusted by the winding assembly 32 winding or releasing the traction rope 33. Owing to adopted rigidity tilting mechanism and by hoist subassembly 32, the flexible tilting mechanism of portal frame 31 and the combination of flexible tractive part 34, accessible rigidity tilting mechanism control carriage 2 is changing between angle and the fold condition that can freely fall, through the conversion between angle that flexible tilting mechanism control carriage 2 can not freely fall to the folding direction and the expansion state, compare in traditional portal formula upset drive arrangement, flexible tilting mechanism adopts hoist subassembly 32, the turned angle of more easily controlled carriage 2, difficult appearance leads to the incident because of improper operation makes 2 turned angle of carriage too big, its fail safe nature is high, and this a folding leg for foldable conveyor has simple structure, and is with low costs, easily make the advantage of assembly.

In this embodiment, as shown in fig. 5 to 7, the rigid turnover mechanism includes a turnover seat 35 hinged to the base 1 and a first telescopic driving member 36 installed on the base 1 for driving the turnover seat 35 to rotate, a hinge axis of the turnover seat 35 coincides with a hinge axis of the conveying frame 2, and the turnover seat 35 is connected to the conveying frame 2 through a detachable connection assembly. The driving end of the first telescopic driving piece 36 drives the overturning seat 35 to rotate when in telescopic motion, so that the overturning seat 35 drives the conveying rack 2 to rotate correspondingly. The hinge axis of the turnover seat 35 coincides with the hinge axis of the conveying frame 2, so that the turnover seat 35 and the conveying frame 2 can synchronously and normally rotate. The overturning seat 35 and the conveying frame 2 are connected through a detachable connecting assembly, and the detachable connecting assembly can realize connection and disconnection of the overturning seat 35 and the conveying frame 2 so as to be capable of converting between two driving modes of a flexible overturning mechanism driving mode and a rigid overturning mechanism driving mode. The rigid turnover mechanism is simple in structure, low in cost, stable and reliable in work, and easy to manufacture, assemble and maintain. The first telescopic driving member 36 is a hydraulic cylinder.

In this embodiment, the detachable connection assembly includes a pin hole formed in the transportation frame 2 and a movable pin 38 that is formed in the flipping base 35 and can be inserted into or withdrawn from the pin hole. When the movable bolt 38 is inserted into the pin hole on the conveying frame 2, the connection between the turning seat 35 and the conveying frame 2 is realized; when the movable bolt 38 exits the pin hole on the conveying frame 2, the turning seat 35 and the conveying frame 2 are disconnected. The detachable connecting assembly is simple in structure, low in cost, stable and reliable in work, and easy to manufacture, assemble and maintain. The movable bolt 38 is a hydraulic bolt.

In this embodiment, the two sides of the position of the conveying frame 2 close to the base 1 are provided with the reinforcing guard beams 201, which can greatly enhance the bending resistance and the load capacity of the conveying frame 2. The reinforcing guard beams 201 on the two sides of the conveying frame 2 correspond to the two rigid turnover mechanisms one by one. A containing space is arranged between the reinforcing guard beam 201 and two side surfaces of the conveying frame 2, the overturning seat 35 is provided with a convex part 351 which is inserted into the containing space when the overturning seat 35 is connected with the conveying frame 2 through a detachable connecting component, and the convex part 351 is provided with a concave hole 352 (equivalent to a built-in space) which extends to the inside of the convex part 351; the first telescopic driving member 36 is a telescopic cylinder hinged to the base 1, and a telescopic rod of the telescopic cylinder is inserted into the concave hole 352 and hinged to the protruding portion 351. When upset seat 35 and carriage 2 link to each other through dismantling coupling assembling, the bulge 351 of upset seat 35 inserts in the accommodation space between enhancement breast beam 201 and the carriage 2, and the telescopic link of flexible hydro-cylinder is inserted and is located in shrinkage pool 352 and articulated with bulge 351 simultaneously, can improve compact structure nature, can solve the limited problem of structural space, shortens the stroke of flexible hydro-cylinder greatly. In addition, the matching structure of the reinforcing guard beam 201 and the overturning seat 35 can reduce the driving force of the oil cylinder and avoid the phenomenon that the conveying frame 2 is stressed and concentrated to generate large deformation or fracture.

The overturning seat 35 comprises two side plates 353 and an upper plate 354, wherein the upper plate 354 is connected between the two side plates 353 to form a U-shaped structure, two triangular webs 355 which are arranged in parallel are connected to the upper plate 354, the two triangular webs 355 are arranged at intervals and connected through an intermediate connecting plate to form a protruding part 351, and a gap between the two triangular webs 355 serves as a concave hole 352 of the protruding part 351. The structure is simple, the manufacture is easy, and the structure can bear larger force and bending moment. During operation, the triangular web 355 moves around the hinge shaft along with the overturning seat 35 and is inserted into the accommodating space between the reinforcing guard beam 201 and the main beams at the two sides of the conveying frame 2. The telescopic rod of the telescopic oil cylinder is inserted in the gap between the two triangular web plates 355 and is hinged at the outer convex angle of the triangular web plates 355 together with the two triangular web plates 355 which are arranged in parallel.

In this embodiment, the reinforcing guard beam 201 includes a guard beam main body 2011, the guard beam main body 2011 is connected to the side of the conveying frame 2 through the plurality of transverse connecting members 2012 and the plurality of diagonal braces 2013, the force and the bending moment applied to the conveying frame 2 can be transmitted to the guard beam main body 2011 through the transverse connecting members 2012 and the diagonal braces 2013, and the reinforcing guard beam 201 with the structure has good stress performance, simple structure, low cost and easy manufacture. The reinforcing guard beams 201 on the two sides of the conveying frame 2 are connected with hinged ear plates 202, and the hinged ear plates 202, the overturning seats 35 and the base 1 are hinged with each other through the same hinged shaft, so that the structure is simple and compact, the cost is low, and the work is stable and reliable.

In this embodiment, the transportation frame 2 includes a rear frame 21 and a front frame 22, one end of the rear frame 21 is hinged to the base 1, the front frame 22 is hinged to the other end of the rear frame 21, and two rotation driving devices for driving the front frame 22 to rotate so as to switch between the folded state and the unfolded state are arranged between the rear frame 21 and the front frame 22. As shown in fig. 8 to 11, the two rotation driving devices are respectively arranged at two sides of the conveying frame 2; the rotation driving device comprises a triangular box body, a straight connecting rod 23 and a second telescopic driving piece 24 which is hinged and installed on the rear frame 21, the triangular box body is formed by connecting two obtuse triangular plates 25 which are arranged in parallel and at intervals through a connecting piece, the obtuse triangular plates 25 are provided with short sides with sequentially increased lengths, long sides and oblique sides, the oblique sides of the two obtuse triangular plates 25 and the acute angles of the long sides are hinged with the rear frame 21 through first hinge shafts 26, one end of the straight connecting rod 23 is hinged with the front frame 22, the obtuse angles of the short sides of the two obtuse triangular plates 25 and the obtuse angles of the long sides are hinged with the other end of the straight connecting rod 23 through second hinge shafts 27, and the acute angles of the short sides of the two obtuse triangular plates 25 and the oblique sides are hinged with the driving end of the second telescopic driving piece. When the driving end of the second telescopic driving part 24 is in telescopic motion, the obtuse triangular plate 25 is driven to rotate around the hinge axis of the obtuse triangular plate, and the obtuse triangular plate 25 drives the front frame 22 to rotate through the straight connecting rod 23, so that the front frame 22 is turned over.

In this embodiment, a tensioning mechanism 29 is disposed at the front end of the frame body of the front frame 22, as shown in fig. 12 and 13, the tensioning mechanism 29 includes a roller shaft 291 and two sliding grooves 292 disposed on the frame body, a sliding block 293 is slidably disposed in each sliding groove 292, two ends of the roller shaft 291 are respectively and correspondingly mounted on the sliding blocks 293 of the two sliding grooves 292, two adjusting screws 294 for adjusting the sliding position of the sliding block 293 are respectively mounted on the frame body and correspond to each sliding block 293, and the two adjusting screws 294 respectively and correspondingly abut against two opposite side surfaces of the sliding block 293. The tensioning mechanism 29 is used for tensioning the conveying belts of the belt conveyors mounted on the rear frame 21 and the front frame 22, and has an effect of adjusting the deviation of the conveying belts. The tensioning mechanism 29 has simple structure and convenient adjustment.

The front frame 22 in this embodiment has an isosceles trapezoid-shaped single truss structure.

In this embodiment, as shown in fig. 14, the gantry 31 includes two columns 311 hinged to the base 1, three beams 312 are connected between the two columns 311, one beam 312 is provided with a first pulley block 313 for winding the pulling rope 33, the other beam 312 is provided with a second pulley block 314 for winding the flexible pulling member 34, an outwardly extending middle brace 315 is fixedly connected to the middle of the beam 312 provided with the second pulley block 314, and a side diagonal brace 316 is connected between both sides of the extending end of the middle brace 315 and the beam 312. The middle brace 315 and the side braces 316 form a ox horn support structure that prevents the cross beam 312 from deforming.

In this embodiment, one end of the pulling rope 33 is wound around the winding unit 32, and the other end thereof is fixedly connected to the base 1 after passing through the fixed pulley block on the base 1 and the first pulley block 313 on the portal frame 31 in sequence. The two groups of second pulley blocks 314 are arranged, the two groups of second pulley blocks 314 are respectively arranged at two ends of the cross beam 312, the two sides of the conveying frame 2 are both connected with flexible traction components 34, and the flexible traction components 34 at the two sides of the conveying frame 2 respectively correspond to the two groups of second pulley blocks 314. The winch assembly 32 is conventional in the art, and the pull rope 33 and flexible pull member 34 are preferably steel wire ropes.

In this embodiment, when the center of gravity of the carriage 2 and the hinge axis of the carriage 2 are located in the same vertical plane, the carriage 2 is in a vertical state, the carriage 2 has an intermediate state between the vertical state and the deployed state, and the flexible pulling member 34 is in a tensioned state when the carriage 2 is in the intermediate state. At this time, the movable bolt 38 of the detachable connection assembly on the roll-over seat 35 coincides with the pin hole on the conveying frame 2, the protruding portion 351 of the roll-over seat 35 is inserted into the accommodating space between the reinforcing guard beam 201 and the conveying frame 2, and the telescopic rod of the first telescopic driving member 36 is in a fully extended state.

In the working process of the folding frame of the embodiment, when the conveying frame 2 moves in the folding state and the middle state, the first telescopic driving piece 36 drives the overturning seat 35 to complete the operation; the gantry 31 is driven by the hoisting assembly 32 during the movement between the intermediate state and the deployed state by means of a pulling rope 33 and a flexible pulling member 34.

When the folding frame of the embodiment is switched between the folding state and the unfolding state, the working process and the principle are as follows:

the carriage 2 in the expanded state is shown in fig. 1, where both the rear frame 21 and the front frame 22 are in the expanded state. When the conveying frame 2 is withdrawn from the unfolding state to the folding state, the front frame 22 is driven to rotate to the folding state (see fig. 2) through the rotation driving device, then the portal frame 31 is driven to rotate through the hoisting component 32 to lift the rear frame 21 to the middle state (see fig. 3), at the moment, the turning seat 35 is connected with the rear frame 21, the movable bolt 38 of the detachable connecting component on the turning seat 35 is overlapped with the pin hole on the rear frame 21, the movable bolt 38 on the turning seat 35 is inserted into the pin hole on the rear frame 21, the turning seat 35 is driven to rotate through the first telescopic driving component 36, the rear frame 21 rotates along with the turning seat 35 until the rear frame 21 is turned to the set angle of the folding state, and the integral folding and withdrawing of the folding frame are realized. When switching from fold condition to the expansion state, order about the roll-over seat 35 through first flexible driving piece 36 earlier and rotate, after-frame 21 rotates along with roll-over seat 35, it is to the intermediate state to overturn until after-frame 21, then make the activity bolt 38 on the roll-over seat 35 withdraw the pinhole on the after-frame 21, rethread hoisting assembly 32 orders about portal frame 31 to rotate and transfers after-frame 21 to the expansion state, order about fore-frame 22 through rotating drive arrangement at last and rotate to the expansion state, realize the whole of folding leg and open.

The above description is only the preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, the modifications and changes obtained without departing from the technical idea of the present invention shall be considered as the protection scope of the present invention.

Claims (10)

1. A folding leg for a folding conveyor, comprising a base (1) and a carriage (2) mounted on the base (1) in an articulated manner, said base (1) being provided with a turning drive device (3) for driving the carriage (2) to turn between a folded state and an unfolded state, characterized in that: the turnover driving device (3) comprises a portal frame (31) and a hoisting assembly (32), wherein the portal frame (31) is hinged to the base (1), the hoisting assembly (32) is installed on the base (1) and connected with the portal frame (31) through a traction rope (33), the portal frame (31) is connected with the conveying frame (2) through a flexible traction part (34), the turnover driving device (3) further comprises more than one rigid turnover mechanism which is used for driving the conveying frame (2) to turn over and enabling the conveying frame (2) to be kept at any turnover angle, and the rigid turnover mechanism is connected with the conveying frame (2) through a detachable connecting assembly.

2. The folding leg of claim 1, wherein: rigid turnover mechanism is including articulated upset seat (35) of installing on base (1) and install and be used for driving upset seat (35) pivoted first flexible driving piece (36) on base (1), the articulated axis of upset seat (35) with the articulated axis coincidence of carriage (2), upset seat (35) and carriage (2) pass through can dismantle coupling assembling and link to each other.

3. The folding leg of claim 2, wherein: the detachable connecting assembly comprises a pin hole arranged on the conveying frame (2) and a movable bolt (38) arranged on the overturning seat (35) and capable of being inserted into or withdrawn from the pin hole.

4. The folding leg of claim 2, wherein: reinforcing guard beams (201) are arranged on two sides of the conveying frame (2) close to the base (1), an accommodating space is arranged between each reinforcing guard beam (201) and the conveying frame (2), the overturning seat (35) is provided with a protruding portion (351) which is inserted into the accommodating space when the overturning seat (35) and the conveying frame (2) are connected through a detachable connecting assembly, and the protruding portion (351) is provided with a concave hole (352) extending into the protruding portion (351); the first telescopic driving piece (36) is a telescopic oil cylinder which is hinged to the base (1), and a telescopic rod of the telescopic oil cylinder is inserted into the concave hole (352) and hinged to the protruding portion (351).

5. The folding leg of claim 4, wherein: the reinforcing guard beam (201) comprises a guard beam main body (2011), and the guard beam main body (2011) is connected to the side surface of the conveying frame (2) through a plurality of transverse connecting pieces (2012) and a plurality of struts (2013); the reinforcing guard beam (201) on two sides of the conveying frame (2) are connected with hinged ear plates (202), and the hinged ear plates (202), the overturning seats (35) and the base (1) are hinged through the same hinge shaft.

6. The folding leg of claim 1, wherein: the conveying frame (2) comprises a rear frame (21) and a front frame (22), one end of the rear frame (21) is hinged to the base (1), the front frame (22) is hinged to the other end of the rear frame (21), and more than one rotation driving device for driving the front frame (22) to rotate so as to be converted between a folding state and an unfolding state is arranged between the rear frame (21) and the front frame (22); the rotation driving device comprises a triangular box body, a straight connecting rod (23) and a second telescopic driving piece (24) which is hinged and installed on the rear frame (21), the triangular box body is formed by connecting two obtuse angle triangular plates (25) which are parallel and arranged at intervals through a connecting piece, the obtuse angle triangular plates (25) are provided with short sides, long sides and oblique sides with the lengths increasing in sequence, the acute angle position where the oblique sides and the long sides of the two obtuse angle triangular plates (25) are intersected is hinged with the rear frame (21) through a first hinge shaft (26), one end of the straight connecting rod (23) is hinged to the front frame (22), the obtuse angles at the intersection of the short sides and the long sides of the two obtuse angle triangular plates (25) are hinged to the other end of the straight connecting rod (23) through a second hinge shaft (27), and the acute angles at the intersection of the short sides and the oblique sides of the two obtuse angle triangular plates (25) are hinged to the driving end of the second telescopic driving piece (24) through a third hinge shaft (28).

7. The folding leg of claim 6, wherein: the utility model discloses a quick-witted structure of adjusting the sliding position of roller, including the support body front end of fore-stock (22) be equipped with tensioning mechanism (29), tensioning mechanism (29) include roller shaft (291) and locate two spout (292) on the support body, and the cunning is equipped with a slider (293) in each spout (292), the both ends of roller shaft (291) correspond respectively and install on slider (293) in two spout (292), correspond on the support body and all install two accommodate the lead screw (294) that are used for adjusting slider (293) sliding position, two accommodate the lead screw (294) correspond respectively and offset with the relative both sides face of this slider (293).

8. The folding leg of claim 1, wherein: portal frame (31) are including articulated two stands (311) of installing on base (1), be connected with two piece at least crossbeams (312) between two stands (311), install on a crossbeam (312) and be used for around establishing first assembly pulley (313) of tractive rope (33), another crossbeam (312) are equipped with and are used for around establishing second assembly pulley (314) of flexible tractive part (34), crossbeam (312) middle part rigid coupling that is equipped with second assembly pulley (314) has a middle vaulting pole (315) of outside extension, the extension end both sides of middle vaulting pole (315) with all be connected with a side diagonal vaulting pole (316) between crossbeam (312).

9. The folding leg according to any one of claims 2 to 5, characterized in that: when the gravity center of the conveying frame (2) and the hinge axis of the conveying frame (2) are located in the same vertical plane, the conveying frame (2) is in a vertical state, the conveying frame (2) has an intermediate state between the vertical state and a spreading state, and the flexible traction component (34) is in a tensioning state when the conveying frame (2) is in the intermediate state.

10. The folding leg of claim 9, wherein: when the conveying frame (2) moves in a folded state and a middle state, the rigid turnover mechanism drives the turnover seat (35) to complete the operation; when the conveying frame (2) moves between the middle state and the unfolding state, the hoisting component (32) winds and unwinds the traction rope (33) to drive the portal frame (31) and the flexible traction component (34) to complete the process.

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