CN220664706U - Foldable movable portal frame - Google Patents

Abstract

The utility model discloses a foldable mobile portal frame which comprises a cross beam, a left support plate seat, a right support plate seat, stand columns, support leg support seats, support legs, bottom wheels and a walking trolley, wherein the left end and the right end of the cross beam which are horizontally arranged are respectively and fixedly connected with the left support plate seat and the right support plate seat, the bottoms of the left support plate seat and the right support plate seat are respectively and flexibly connected with one stand column, the stand columns are vertically arranged, the middle parts of the stand columns are connected with the support leg support seats in a height-adjustable manner, two sides of the support leg support seats are respectively and flexibly connected with one support leg, and the bottom wheels are arranged at the bottom ends of the support legs; the travelling trolley slides along the horizontal guide of the cross beam. According to the foldable movable portal frame, the portal frame is integrally folded and stored through reasonable design, disassembly is not needed, and the portal frame is carried and transported together, so that portability is greatly improved.

Description

Foldable movable portal frame

Technical Field

The utility model relates to the technical field of portal frames, in particular to a foldable movable portal frame.

Background

The portal frame is a small-sized lifting facility developed according to the daily production requirements of middle and small factories, such as the requirements of carrying equipment, warehouse goods in and out, lifting and maintaining heavy equipment and material transportation. The portal frame is suitable for manufacturing moulds, steam repair factories, mines, civil engineering construction sites and other occasions needing hoisting. The common building construction is used as material transportation and up-down use of constructors, so that hoisting mechanization is realized. The labor force can be reduced, the production and operation cost can be reduced, and the working efficiency can be improved.

Most of the existing portal frames cannot be adjusted in lifting height, cannot walk and move to be in position, and cannot be applied to various lifting demand occasions. For this reason, the portal frame has been improved in adaptability. The portable folding lifting portal frame of the utility model patent with the bulletin number of CN211687987U is added with universal wheels, a base, telescopic arms, telescopic rods, splicing blocks, sliding rods, pull rods, locking pins and fastening bolts in the technical scheme of the utility model, the lifting height is adjusted through the telescopic arms, and meanwhile, the movable effect of the lifting portal frame is improved due to the application of the universal wheels. However, the base in this patent cannot be folded by adopting the triangular support, and is still required to be disassembled and then transported separately when transported to the middle and long distance, and assembled after arriving at the site, so that portability is not very good.

Accordingly, there is a need to develop a collapsible mobile portal frame that addresses the above-described drawbacks.

Disclosure of Invention

The utility model aims to provide a foldable movable portal frame, which enables the whole portal frame to be folded and stored through reasonable design without disassembly, and is carried and transported together, thereby greatly improving portability.

In order to solve the technical problems, the utility model adopts the following technical scheme:

the utility model discloses a foldable mobile portal frame which comprises a cross beam, a left support plate seat, a right support plate seat, stand columns, support leg support seats, support legs, bottom wheels and a walking trolley, wherein the left end and the right end of the cross beam which are horizontally arranged are respectively and fixedly connected with the left support plate seat and the right support plate seat, the bottoms of the left support plate seat and the right support plate seat are respectively and flexibly connected with one stand column, the stand columns are vertically arranged, the middle parts of the stand columns are connected with the support leg support seats in a height-adjustable manner, two sides of the support leg support seats are respectively and flexibly connected with one support leg, and the bottom wheels are arranged at the bottom ends of the support legs; the travelling trolley slides along the horizontal guide of the cross beam.

Further, the left support plate seat comprises two side plates symmetrically arranged along the width direction of the cross beam, the top ends of the side plates are fixedly connected to the end part of the cross beam through bolts, a first rotating shaft bolt is connected to the middle part of each side plate in a penetrating way, through holes are formed in the top ends of the stand columns, and the top ends of the stand columns are inserted between the two side plates and are rotatably sleeved on the first rotating shaft bolt; the side plate is further provided with a working positioning bolt through hole right below the first rotating shaft bolt, a locking bolt penetrates through the working positioning bolt through hole, and the locking bolt penetrates through the upper positioning bolt through hole on the upright post to lock the vertical working position of the upright post.

Further, the side plate is further provided with a folding positioning bolt through hole on the horizontal inner side of the first rotating shaft bolt, and the locking bolt penetrates through the folding positioning bolt through hole and the upper positioning bolt through hole and can lock the folding state position of the upright post.

Further, the structure of the right support plate seat is consistent with that of the left support plate seat and symmetrically arranged at the right end of the cross beam, and the height of the second rotating shaft bolt of the right support plate seat is lower than that of the first rotating shaft bolt and is not smaller than the width distance of one upright post.

Further, a plurality of locking holes are formed in the middle lower portion of the upright at equal intervals, two height locking bolts are vertically arranged in the middle of the supporting leg supporting seat, and the height locking bolts penetrate into the locking holes.

Further, the landing leg supporting seat is an isosceles triangle plate box structure with upper and lower openings, third rotating shaft bolts, outer limit bolt through holes and inner limit bolt through holes are symmetrically formed in two ends of the landing leg supporting seat, the top ends of the landing legs are inserted into the landing leg supporting seat, the bolt through holes in the top ends of the landing legs are sleeved on the third rotating shaft bolts, the outer limit bolt through holes and the inner limit bolt through holes are respectively located outside and under the lower side of the third rotating shaft bolts, and the outer limit bolt through holes and the inner limit bolt through holes can be used for locking the working state and the folding shrinkage state of the landing legs respectively in a penetrating bolt mode.

Further, the bottom wheel specifically adopts a universal wheel with a parking braking function.

Further, the novel lifting device further comprises a first lifting handle rope and a second lifting handle rope, wherein two ends of the first lifting handle rope are sleeved and fixed at two ends of the first rotating shaft bolt, and two ends of the second lifting handle rope are sleeved and fixed at two ends of the second rotating shaft bolt.

Further, the trolley comprises a dragging wheel, wherein the dragging wheel comprises two single wheels which are symmetrically arranged along the width direction of the cross beam, the single wheels are rotatably arranged at one end of the top of the cross beam through a middle shaft, and the top surface of each single wheel is higher than the walking trolley.

Compared with the prior art, the utility model has the beneficial technical effects that:

according to the foldable movable portal frame, the stand columns are connected in a foldable manner through the support plate seat, so that the stand columns can be folded inwards, namely, the stand columns can be arranged below the cross beam in the same direction; the support leg supporting seat is connected with the two support legs which incline outwards and downwards, the stand column and the cross beam can be stably supported during operation, and the support legs are folded inwards during collection, so that the support legs are parallel to the stand column and are arranged below the cross beam along with the stand column. Through such folding collection, compact structure can reduce the occupation space after folding by a wide margin, and the transfer transportation of being convenient for middle and long distance. According to the foldable movable portal frame, the portal frame is integrally folded and stored through reasonable design, disassembly is not needed, and the portal frame is carried and transported together, so that portability is greatly improved.

In addition, through seting up first pivot bolt on left backup pad seat, first pivot bolt can realize folding in-process rotation as the pivot of stand, through seting up on the curb plate of left backup pad seat folding positioning bolt via hole with work positioning bolt via hole, the last positioning bolt via hole cross-under of cooperation stand locking bolt can lock operating condition and folding condition. Through setting up the second pivot bolt that the position is slightly low on right branch fagging seat, can reduce the folding back height of right branch fagging seat below corresponding stand, make it not interfere with the stand of offside, the parallel stack of two stands is regular being convenient for place. Through offer a plurality of locking holes of arranging regularly on the stand, two high locking bolts at cooperation landing leg supporting seat middle part are convenient for accomplish the upper and lower position adjustment of landing leg supporting seat, and then accomplish the adjustment of longmen rest height. Through setting up to isosceles triangle shaped plate box structure's landing leg supporting seat, can the symmetrical slope come out the landing leg, the landing leg supports the stand, stable in structure is reliable. When the folding device is contracted and folded, the inner limit bolt through hole is penetrated and connected with the bolt locking support leg to be parallel to the upright post, and the structure is compact and regular. Through installing the handle rope on the backup pad seat at crossbeam both ends, grasp when being convenient for manual handling loading and unloading, avoid grasping the tong condition that other positions arouse. Through the setting of towing the wheel, the manual dragging of the short distance in being convenient for shifts, drags the wheel and rolls subaerial, and the operation personnel pulls first handle rope in the crossbeam other end and drags the line. The additional equipment of trailer equipment is avoided, and the transfer cost is saved.

Drawings

The utility model is further described with reference to the following description of the drawings.

FIG. 1 is a schematic front view of a collapsible mobile portal frame of the present utility model;

FIG. 2 is a right side view of the collapsible mobile portal frame of the present utility model;

FIG. 3 is a schematic view of the leg portion of the present utility model in a contracted state;

fig. 4 is a schematic view of the overall folded state of the present utility model.

Reference numerals illustrate: 1. a cross beam; 101. a track groove; 2. a left support plate seat; 201. a first swivel bolt; 3. a right support plate seat; 301. a second spindle bolt; 4. a column; 401. a locking hole; 5. a supporting leg supporting seat; 501. a third spindle bolt; 502. an outer limit bolt via hole; 503. an inner limit bolt via hole; 504. a height locking bolt; 6. a support leg; 7. a bottom wheel; 8. a walking trolley; 9. a first handle cord; 10. a second handle string; 11. towing wheels.

Detailed Description

The foldable movable portal frame has the core that the foldable movable portal frame is provided, the whole portal frame is folded and stored through reasonable design, disassembly is not needed, and the portal frame is carried and transported together, so that portability is greatly improved.

The following description of the embodiments of the present utility model will be made in detail with reference to the accompanying drawings, wherein it is apparent that the embodiments described are only some, but not all embodiments of the utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.

In the description of the present utility model, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present utility model and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present utility model.

Referring to the drawings, FIG. 1 is a schematic front view of a collapsible mobile portal frame of the present utility model; FIG. 2 is a right side view of the collapsible mobile portal frame of the present utility model; FIG. 3 is a schematic view of the leg portion of the present utility model in a contracted state; fig. 4 is a schematic view of the overall folded state of the present utility model.

In one embodiment, as shown in fig. 1 to 4, the foldable mobile portal frame of the present utility model comprises a cross beam 1, a left support plate seat 2, a right support plate seat 3, a column 4, a leg support seat 5, a leg 6, a bottom wheel 7 and a travelling trolley 8. The left end and the right end of the horizontal beam 1 are respectively and fixedly connected with the left support plate seat 2 and the right support plate seat 3. The bottoms of the left supporting plate seat 2 and the right supporting plate seat 3 are respectively connected with a stand column 4 in a folding way, namely, the top end of the stand column 4 can be locked and switched into a working state and a folding state in the left supporting plate seat 2 or the right supporting plate seat 3. The upright post 4 is vertically arranged, and the middle part of the upright post 4 can be connected with the supporting leg supporting seat 5 with the height adjustable, namely, the supporting leg supporting seat 5 can move up and down along the upright post 4 and lock the position. Two sides of the supporting leg supporting seat 5 are respectively connected with one supporting leg 6 in a folding way, namely the top ends of the supporting legs 6 are inserted into the supporting leg supporting seat 5 and are locked and switched into a working state and a folding state. The bottom ends of the supporting legs 6 are provided with bottom wheels 7, and the four bottom wheels 7 roll and walk on the ground of the hoisting field. The walking trolley 8 slides along the horizontal guide of the cross beam 1, and an electric or chain block is arranged at the bottom of the walking trolley 8 through a hanging ring.

Specifically, as shown in fig. 1 to 4, the under wheel 7 is specifically a universal wheel having a parking brake function.

The upright post 4 can be folded through the supporting plate seat, so that the upright post 4 can be folded inwards by 90 degrees, namely, the upright post 4 can be arranged below the cross beam 1; two supporting legs 6 which incline outwards and downwards are connected through supporting leg supporting seats 5, the upright post 4 and the cross beam 1 can be stably supported in the working process, and the supporting legs 6 are folded inwards when being collected, so that the supporting legs 6 are parallel to the upright post 4 and are arranged below the cross beam 1 along with the upright post 4. Through such folding collection, compact structure can reduce the occupation space after folding by a wide margin, and the transfer transportation of being convenient for middle and long distance. According to the foldable movable portal frame, the portal frame is integrally folded and stored through reasonable design, disassembly is not needed, and the portal frame is carried and transported together, so that portability is greatly improved.

In a specific embodiment, as shown in fig. 1, 2 and 4, the left support plate seat 2 includes two side plates symmetrically arranged along the width direction of the beam 1, and the top ends of the side plates are fixedly connected to the end of the beam 1 through bolts, that is, the two side plates are clamped on two side walls of the beam 1. The middle part of the side plate is connected with a first rotating shaft bolt 201 in a penetrating way, the top end of the upright post 4 is inserted between the two side plates, and a through hole at the top end of the upright post 4 is rotatably sleeved on the first rotating shaft bolt 201. The side plate is further provided with a working positioning bolt through hole right below the first rotating shaft bolt 201, and a locking bolt is connected to the working positioning bolt through hole in a penetrating mode. An upper positioning bolt through hole is formed in the top of the upright post 4, and the locking bolt penetrates through the upper positioning bolt through hole to lock the vertical working position of the upright post 4.

Specifically, as shown in fig. 1, 2 and 4, the side plate is further provided with a folded positioning bolt via hole on the inner side of the first pivot bolt 201 in the horizontal direction, and the locking bolt passes through the folded positioning bolt via hole and the upper positioning bolt via hole, so that the folded state position of the upright post 4 can be locked. The center distances from the folded positioning bolt through hole and the working positioning bolt through hole to the first rotating shaft bolt 201 are equal.

Obviously, the supporting plate seat and the upright post 4 are in a bolt limiting connection mode, and can also be in a cylindrical pin limiting connection mode, and the end head of the cylindrical pin is limited by a cotter pin or a circular ring safety pin which is convenient to detach. Similar simple alternatives fall within the scope of the utility model.

Through seting up first pivot bolt 201 on left backup pad seat 2, first pivot bolt 201 can realize folding in-process rotation as the pivot of stand 4, through seting up on the curb plate of left backup pad seat 2 folding positioning bolt via hole with work positioning bolt via hole, cooperation stand 4 go up positioning bolt via hole cross-under locking bolt can lock operating condition and folding condition.

Specifically, as shown in fig. 1, 2 and 4, the right support plate 3 is identical to the left support plate 2 in structure and symmetrically disposed at the right end of the cross beam 1, and the top of the right support plate 3 is also fixed to the cross beam 1 by bolts. The height of the second spindle bolt 301 of the right support plate holder 3 is not smaller than the width distance of one upright 4 than the first spindle bolt 201.

Through setting up the second pivot bolt 301 that the position is slightly low on right backup pad seat 3, can reduce the folding back height of right backup pad seat 3 below corresponding stand 4, make it not interfere with stand 4 on the contralateral side, the parallel stack of two stands 4 is regular to be convenient for place.

In a specific embodiment of the present utility model, as shown in fig. 2 and 3, a plurality of locking holes 401 are equally spaced at the middle lower portion of the upright post 4, and two height locking bolts 504 are vertically provided at the middle portion of the leg supporter 5, and the height locking bolts 504 are penetrated into the locking holes 401. The center distance of two height locking bolts 504 coincides with the center distance of two adjacent locking holes 401.

Through offer a plurality of locking holes 401 that arrange regularly on stand 4, cooperate two high locking bolts 504 in landing leg supporting seat 5 middle part, be convenient for accomplish the upper and lower position adjustment of landing leg supporting seat 5, and then accomplish the adjustment of longmen rest height.

In a specific embodiment of the present utility model, as shown in fig. 2 and 3, the leg support base 5 is an isosceles triangle plate box structure with upper and lower openings, and the upright post 4 vertically penetrates through the leg support base 5 in a centered manner. The two ends of the supporting leg supporting seat 5 are symmetrically provided with a third rotating shaft bolt 501, an outer limit bolt through hole 502 and an inner limit bolt through hole 503, and the center distances from the outer limit bolt through hole 502 and the inner limit bolt through hole 503 to the third rotating shaft bolt 501 are equal. The top of the supporting leg 6 is inserted into the supporting leg supporting seat 5, the bolt through hole at the top of the supporting leg 6 is sleeved on the third rotating shaft bolt 501 at the top, the outer limit bolt through hole 502 and the inner limit bolt through hole 503 are respectively located on the outer side and the right lower side below the third rotating shaft bolt 501, and the outer limit bolt through hole 502 and the inner limit bolt through hole 503 can be used for locking the working state and the folding shrinkage state of the supporting leg 6 respectively in a penetrating bolt mode. In the working state, the supporting legs 6 extend outwards in an inclined mode, and the bottom wheels 7 at the bottoms of the supporting legs 6 are supported on the ground.

Obviously, the supporting leg supporting seat 5 and the supporting leg 6 are in a bolt limiting connection mode, and can also be in a cylindrical pin limiting connection mode, and the end head of the cylindrical pin is limited by a cotter pin or a circular ring safety pin which is convenient to detach. Similar simple alternatives fall within the scope of the utility model.

Through setting up to isosceles triangle shaped plate box structure's landing leg supporting seat 5, can the symmetrical slope stretch out landing leg 6, landing leg 6 supports stand 4, stable in structure is reliable. When the folding type folding device is compact and regular in structure, the inner limit bolt through holes 503 penetrate through the bolt locking support legs 6 and are parallel to the upright posts 4.

In a specific embodiment of the present utility model, as shown in fig. 1, 2 and 4, the foldable mobile gantry of the present utility model further includes a first handle rope 9 and a second handle rope 10, wherein two ends of the first handle rope 9 are connected with fixing rings, the fixing rings are sleeved and fixed at two ends of the first rotating shaft bolt 201, and two ends of the second handle rope 10 are sleeved and fixed at two ends of the second rotating shaft bolt 301.

Through installing the handle rope on the backup pad seat at crossbeam 1 both ends, grasp when being convenient for manual handling loading and unloading, avoid grasping the tong condition that other positions arouse.

In a specific embodiment of the present utility model, as shown in fig. 1, 2 and 4, the foldable mobile portal frame of the present utility model further comprises a dragging wheel 11, wherein the dragging wheel 11 comprises two single wheels symmetrically arranged along the width direction of the beam 1, the single wheels are rotatably mounted at one end of the top of the beam 1 through a central shaft, and the top surface of the single wheels is higher than the travelling trolley 8.

Through the setting of towing wheel 11, the manual operation of being convenient for in the short distance pulls the transfer, and when dragging, towing wheel 11 rolls subaerial, and the operation personnel pulls first handle rope 9 in crossbeam 1 other end and drags the line. The additional equipment of trailer equipment is avoided, and the transfer cost is saved.

When the foldable movable portal frame is folded, the portal frame which is vertically placed in normal operation is placed down, the supporting leg 6 is folded and collected firstly, the bolts are disassembled from the outer limit bolt through holes 502, the supporting leg 6 is pushed inwards to rotate to the position parallel to the upright post 4, and the supporting leg 6 is penetrated into the inner limit bolt through holes 503 and locked. This is done so that all four legs 6 are retracted. The height lock bolts 504 are removed, and the leg support base 5 is pushed toward the beam so as to coincide with the two top-most lock holes 401, and the height lock bolts 504 are reinstalled. This is done so that the two leg supports 5 retract to the top. The locking bolt of the working positioning bolt through hole below the first rotating shaft bolt 201 is disassembled, the upright post 4 is pushed to rotate inwards by 90 degrees, the left upright post 4 is placed below the cross beam 1 in sequence, and the folding positioning bolt through hole is locked again by using the locking bolt, so that the upright post 4 is prevented from retreating. Similarly, the right upright 4 is folded. Folding is completed. When the middle-short distance transfer operation is needed, manual dragging transfer can be selected. When in dragging, the dragging wheel 11 rolls on the ground, and an operator pulls the first lifting handle rope 9 at the other end of the cross beam 1 to drag.

According to the foldable movable portal frame, the stand column 4 is connected in a foldable manner through the support plate seat, so that the stand column 4 can be folded inwards by 90 degrees, namely, the stand column 4 can be arranged below the cross beam 1; two supporting legs 6 which incline outwards and downwards are connected through supporting leg supporting seats 5, the upright post 4 and the cross beam 1 can be stably supported in the working process, and the supporting legs 6 are folded inwards when being collected, so that the supporting legs 6 are parallel to the upright post 4 and are arranged below the cross beam 1 along with the upright post 4. Through such folding collection, compact structure can reduce the occupation space after folding by a wide margin, and the transfer transportation of being convenient for middle and long distance. According to the foldable movable portal frame, the portal frame is integrally folded and stored through reasonable design, disassembly is not needed, and the portal frame is carried and transported together, so that portability is greatly improved. In addition, through seting up first pivot bolt 201 on left backup pad seat 2, first pivot bolt 201 can realize folding in-process rotation as the pivot of stand 4, through seting up on the curb plate of left backup pad seat 2 folding positioning bolt via hole with work positioning bolt via hole, cooperation stand 4 go up positioning bolt via hole cross-under locking bolt can lock operating condition and folded condition. Through setting up the second pivot bolt 301 that the position is slightly low on right backup pad seat 3, can reduce the folding back height of right backup pad seat 3 below corresponding stand 4, make it not interfere with stand 4 on the contralateral side, the parallel stack of two stands 4 is regular to be convenient for place. Through offer a plurality of locking holes 401 that arrange regularly on stand 4, cooperate two high locking bolts 504 in landing leg supporting seat 5 middle part, be convenient for accomplish the upper and lower position adjustment of landing leg supporting seat 5, and then accomplish the adjustment of longmen rest height. Through setting up to isosceles triangle shaped plate box structure's landing leg supporting seat 5, can the symmetrical slope stretch out landing leg 6, landing leg 6 supports stand 4, stable in structure is reliable. When the folding type folding device is compact and regular in structure, the inner limit bolt through holes 503 penetrate through the bolt locking support legs 6 and are parallel to the upright posts 4. Through installing the handle rope on the backup pad seat at crossbeam 1 both ends, grasp when being convenient for manual handling loading and unloading, avoid grasping the tong condition that other positions arouse. Through the setting of towing wheel 11, the manual operation of being convenient for in the short distance pulls the transfer, and when dragging, towing wheel 11 rolls subaerial, and the operation personnel pulls first handle rope 9 in crossbeam 1 other end and drags the line. The additional equipment of trailer equipment is avoided, and the transfer cost is saved.

In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.

The above embodiments are only illustrative of the preferred embodiments of the present utility model and are not intended to limit the scope of the present utility model, and various modifications and improvements made by those skilled in the art to the technical solutions of the present utility model should fall within the protection scope defined by the claims of the present utility model without departing from the design spirit of the present utility model.

Claims (6)

1. The utility model provides a collapsible removal portal frame, its characterized in that includes crossbeam (1), left backup pad seat (2), right branch backup pad seat (3), stand (4), landing leg supporting seat (5), landing leg (6), return pulley (7) and travelling car (8), the horizontal setting both ends respectively fixed connection left side backup pad seat (2) and right branch backup pad seat (3) about crossbeam (1), the bottom of left side backup pad seat (2) and right branch backup pad seat (3) respectively collapsible connection one stand (4), the vertical setting of stand (4) and the connection of middle part height-adjustable landing leg supporting seat (5), a landing leg supporting seat (5) both sides respectively collapsible connection one landing leg (6), the bottom installation of landing leg (6) return pulley (7); the travelling trolley (8) slides along the cross beam (1) in a horizontal guiding way;

the left support plate seat (2) comprises two side plates symmetrically arranged along the width direction of the cross beam (1), the top ends of the side plates are fixedly connected to the end part of the cross beam (1) through bolts, a first rotating shaft bolt (201) is connected to the middle of each side plate in a penetrating way, through holes are formed in the top ends of the upright posts (4), and the top ends of the upright posts (4) are inserted between the two side plates and are rotatably sleeved on the first rotating shaft bolt (201); the side plate is also provided with a working positioning bolt through hole right below the first rotating shaft bolt (201), a locking bolt is connected to the working positioning bolt through hole in a penetrating way, and the locking bolt penetrates through the upper positioning bolt through hole on the upright post (4) to lock the vertical working position of the upright post (4);

the side plate is further provided with a folding positioning bolt through hole on the horizontal inner side of the first rotating shaft bolt (201), and the locking bolt penetrates through the folding positioning bolt through hole and the upper positioning bolt through hole and can lock the folding state position of the upright post (4);

the structure of the right supporting plate seat (3) is consistent with that of the left supporting plate seat (2) and symmetrically arranged at the right end of the cross beam (1), and the height of a second rotating shaft bolt (301) of the right supporting plate seat (3) is lower than that of the first rotating shaft bolt (201) by a distance not smaller than the width of one upright post (4).

2. The collapsible mobile portal frame of claim 1, wherein: a plurality of locking holes (401) are formed in the middle lower portion of the upright post (4) at equal intervals, two height locking bolts (504) are vertically arranged in the middle of the supporting leg supporting seat (5), and the height locking bolts (504) penetrate into the locking holes (401).

3. The collapsible mobile portal frame of claim 2, wherein: the landing leg supporting seat (5) is of an isosceles triangle plate box structure with upper and lower openings, a third rotating shaft bolt (501), an outer limit bolt through hole (502) and an inner limit bolt through hole (503) are symmetrically arranged at two ends of the landing leg supporting seat (5), the top end of the landing leg (6) is inserted into the landing leg supporting seat (5), the bolt through hole at the top end of the landing leg (6) is sleeved on the third rotating shaft bolt (501), the outer limit bolt through hole (502) and the inner limit bolt through hole (503) are respectively located outside and under the lower side of the third rotating shaft bolt (501), and the working state and the folding shrinkage state of the landing leg (6) can be respectively locked through a penetrating bolt mode.

4. The collapsible mobile portal frame of claim 1, wherein: the bottom wheel (7) is specifically a universal wheel with a parking braking function.

5. The collapsible mobile portal frame of claim 1, wherein: the novel lifting device is characterized by further comprising a first lifting handle rope (9) and a second lifting handle rope (10), wherein two ends of the first lifting handle rope (9) are sleeved and fixed at two ends of the first rotating shaft bolt (201), and two ends of the second lifting handle rope (10) are sleeved and fixed at two ends of the second rotating shaft bolt (301).

6. The collapsible mobile portal frame of claim 5, wherein: the novel walking trolley is characterized by further comprising a dragging wheel (11), wherein the dragging wheel (11) comprises two single wheels which are symmetrically arranged along the width direction of the cross beam (1), the single wheels are rotatably arranged at one end of the top of the cross beam (1) through a middle shaft, and the top surface of each single wheel is higher than the walking trolley (8).