Bridge guardrail overhead operation platform based on portal frame hoisting and using method thereof

Abstract

The invention relates to the technical field of overhead operation platforms, in particular to a bridge guardrail overhead operation platform based on portal frame hoisting and a using method thereof. The bridge guardrail overhead operation platform comprises a platform support and a supporting plate fixed to the top of the platform support; the winch is installed on the supporting plate, a steel cable penetrating through the supporting plate is wound on the winch, a protection frame is fixedly hung on the steel cable, and a bottom plate is fixed to the bottom of the protection frame; the synchronous unfolding mechanism is arranged on the supporting plate and is connected with the bottom plate; the speed-up centrifugal mechanism is arranged on the synchronous unfolding mechanism, and the synchronous unfolding mechanism is further provided with a follow-up adjusting assembly connected with the speed-up centrifugal mechanism; and the stall locking mechanism is arranged on the speed-increasing centrifugal mechanism and connected with the follow-up adjusting assembly, and the position of the protection frame can be locked through the stall locking mechanism when traction force on the protection frame disappears due to breakage of a steel cable or damage of a winch.

Description

Technical Field

[0001] The invention relates to the technical field of aerial work platforms, and in particular to an aerial work platform for a bridge guardrail based on gantry hoisting and a use method thereof. Background Art

[0002] The aerial work platform is a kind of work platform set up during construction to facilitate construction workers to carry out aerial work. It can not only improve the work efficiency of construction workers, but also effectively ensure the safety of construction workers.

[0003] In order to ensure the safety of construction workers, the aerial work platform must be equipped with safety protection measures. In actual operation, it is also necessary to carry out maintenance and repair in a timely manner according to various situations to ensure the integrity of the facilities and the safety of construction workers.

[0004] When adjusting the height of the working platform, the steel cable is usually wound or released by a winch. In actual operation, the winch itself has a self-locking function, which can lock the platform position after the platform moves to the required height. However, if the steel cable breaks or the self-locking function of the winch fails, the existing working platform is not equipped with a backup stall lock device, and the working platform will fall, which makes it impossible to ensure the safety of the user. Summary of the invention

[0005] The purpose of the present invention is to provide a bridge guardrail aerial work platform based on gantry hoisting and a use method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object, the present invention provides the following technical solutions: A bridge guardrail aerial work platform based on gantry hoisting, comprising: A platform bracket, and a support plate mounted on the top of the platform bracket; A winch is mounted on the support plate, a steel cable passing through the support plate is wound around the winch, a protective frame is fixedly suspended on the steel cable, and a bottom plate is fixed at the bottom of the protective frame; Also includes: A synchronous unfolding mechanism, which is arranged on the support plate and connected to the bottom plate, and can be actuated when the winch reels in or releases the steel cable to control the protection frame to move in a vertical direction; A speed-increasing centrifugal mechanism is arranged on the synchronous unfolding mechanism, and the synchronous unfolding mechanism is also provided with a follow-up adjustment component connected to the speed-increasing centrifugal mechanism; The stall lock mechanism is arranged on the speed-increasing centrifugal mechanism and connected to the follow-up adjustment component. When the speed-increasing centrifugal mechanism moves, the follow-up adjustment component can limit the movement of the synchronous deployment mechanism through the stall lock mechanism.

[0007] As a further solution of the present invention: the synchronous unfolding mechanism includes a first support sleeve installed on the support plate and symmetrically arranged, a second support sleeve is slidably installed in the first support sleeve, a support rod is slidably installed in the second support sleeve, the support rod is fixedly connected to the base plate, and a scissors assembly connected to the second support sleeve is provided on the first support sleeve.

[0008] As a further solution of the present invention: the scissor assembly comprises first fixing rings respectively mounted on the first supporting sleeve, the second supporting sleeve and the supporting rod, and a first rotating rod is rotatably mounted on each of the first fixing rings; It also includes a first hinged rod, a second hinged rod, and a third hinged rod which are respectively hinged on each of the first rotating rods and are symmetrically arranged. The end of the first hinged rod is hinged to the end of the second hinged rod, and the end of the second hinged rod is hinged to the end of the third hinged rod.

[0009] As a further solution of the present invention: the speed-increasing centrifugal mechanism includes a first gear installed on the first rotating rod, second fixing rings are respectively fixed on the first supporting sleeve, the second supporting sleeve and the supporting rod, a second rotating rod is rotatably installed on the second fixing ring, a second gear meshing with the first gear is fixed at the end of the second rotating rod, and a driven assembly is arranged on the second rotating rod.

[0010] As a further solution of the present invention: the driven component includes a rotating plate installed on the second rotating rod, the rotating plate is provided with symmetrically arranged sliding grooves, and a sliding block is slidably installed in the sliding groove.

[0011] As a further solution of the present invention: the follow-up adjustment assembly includes a receiving plate mounted on the second fixing ring and sleeved on the second rotating rod, a rotating sleeve is rotatably mounted on the receiving plate, and a follow-up sleeve is slidably mounted on the rotating sleeve; It also includes a hollow rod installed on the sliding block, in which a movable rod fixedly connected to the follower sleeve is slidably installed.

[0012] As a further solution of the present invention: the stall lock mechanism includes a guide column installed on the supporting plate and symmetrically arranged, a first movable plate and a second movable plate are slidably installed on the guide column, the first movable plate is rotatably connected with the follower sleeve, a follower tooth is fixed on the second rotating rod, a limiting tooth cooperating with the follower tooth is fixed on the second movable plate, and a guide assembly connected with the first movable plate is provided on the rotating sleeve.

[0013] As a further solution of the present invention: the guide assembly includes a vertical groove and an annular groove opened on the circumferential outer wall of the rotating sleeve, the ends of the vertical groove and the annular groove are connected to each other, the inner wall of the first movable plate is fixed with a first limit block that is slidably engaged with the vertical groove and the annular groove, and the rotating sleeve is provided with an elastic structure connected to the first movable plate.

[0014] As a further solution of the present invention: the elastic structure includes a first spring and a second spring sleeved on the rotating sleeve, two ends of the first spring respectively abut against the first movable plate and the second movable plate, and two ends of the second spring respectively abut against the second movable plate and the receiving plate; It also includes a spiral groove formed on the outer circumferential wall of the rotating sleeve, and a second limiting block slidably engaged with the spiral groove is fixed on the inner wall of the second movable plate.

[0015] A method for using a bridge guardrail aerial work platform based on gantry hoisting, comprising the following steps: Step 1: Move the platform support to the construction position so that the protective frame and the bottom plate are located at the required working position; Step 2: Under the action of the winch, the height of the protection frame and the bottom plate is adjusted through the steel cable, and under the action of the synchronous deployment mechanism, the protection frame is ensured to remain stable during movement; Step 3: When the steel cable breaks or the winch is damaged, causing the protective frame to fall, the speed-increasing centrifugal mechanism drives the follow-up adjustment component to move, thereby driving the stall lock mechanism to move; Step 4: Under the action of the stall lock mechanism, limit the movement of the synchronous deployment mechanism to fix the protective frame and the bottom plate.

[0016] Compared with the prior art, the beneficial effect of the present invention is that the present application can ensure that the protective frame always maintains a stable state through the synchronous unfolding mechanism when the steel cable is wound or released. Specifically, under the action of the winch, the protective frame is driven to move by the steel cable, and under the action of the synchronous unfolding mechanism, the protective frame moves in the vertical direction. During the adjustment process, the second support sleeve and the support rod are equidistantly unfolded, so that the sizes of the first support sleeve and the second support sleeve and the support rod that are fitted together always remain equal, so that the strength between the various tube bodies always remains the same, thereby achieving a certain rigid strength while guiding the protective frame to ensure that the protective frame will not shift.

[0017] If the steel cable breaks or the locking of the winch fails, under the action of the speed-increasing centrifugal mechanism, the stall lock mechanism is controlled to move through the follow-up adjustment component. Under the action of the stall lock mechanism, the second rotating rod is locked to limit the rotation of the first gear through the second gear, thereby limiting the movement of the scissors assembly through the first rotating rod to quickly lock the position of the protective frame.

[0018] When the vehicle stalls, the locking force provided by the stall lock mechanism will be evenly distributed on the first support sleeve, the second support sleeve and the support rod, so that when the locking force offsets the gravity and inertia force of the protective frame itself, it is borne separately by the multiple first rotating rods, thereby avoiding the problem of deformation or breakage of the stall lock mechanism and other phenomena causing locking failure due to excessive gravity and inertia force to be offset. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 The present invention is a structural schematic diagram of an embodiment of a bridge guardrail aerial work platform based on gantry hoisting.

[0020] Figure 2 This is a structural schematic diagram from another angle in an embodiment of a bridge guardrail aerial work platform based on gantry hoisting.

[0021] Figure 3 The present invention is a structural schematic diagram of a winch, a steel cable, a protective frame, a base plate, and a synchronous unfolding mechanism in one embodiment of an aerial work platform for bridge guardrails hoisted based on a gantry.

[0022] Figure 4 for Figure 3 A schematic diagram of the enlarged structure at point A in the middle.

[0023] Figure 5 The present invention is a schematic diagram of the connection relationship between a synchronous deployment mechanism, a partial speed-increasing centrifugal mechanism, and a partial stall locking mechanism in an embodiment of a bridge guardrail aerial work platform based on gantry hoisting.

[0024] Figure 6The present invention is a structural schematic diagram of a synchronous unfolding mechanism in an embodiment of a bridge guardrail aerial work platform based on gantry hoisting.

[0025] Figure 7 The present invention is a schematic diagram of the connection relationship between part of the speed-increasing centrifugal mechanism, part of the stall locking mechanism, and the follow-up adjustment component in an embodiment of a bridge guardrail aerial work platform based on gantry hoisting.

[0026] Figure 8 It is a schematic diagram of a partial half-section structure of an embodiment of a bridge guardrail aerial work platform based on gantry hoisting.

[0027] Fig. 9 for Figure 8 A magnified schematic diagram of the structure at point B in the middle.

[0028] Fig.10 The present invention is a schematic diagram of the exploded structure of part of the speed-increasing centrifugal mechanism and part of the follow-up adjustment component in an embodiment of a bridge guardrail aerial work platform based on gantry hoisting.

[0029] Fig.11 The present invention is a schematic diagram of the exploded structure of some follow-up adjustment components and stall locking mechanisms in an embodiment of a bridge guardrail aerial work platform based on gantry hoisting.

[0030] In the figure: 1, platform bracket; 2, support plate; 3, winch; 4, steel cable; 5, protection frame; 6, bottom plate; 7, first support sleeve; 8, second support sleeve; 9, support rod; 10, fixing ring; 11, first rotating rod; 12, first hinge rod; 13, second hinge rod; 14, third hinge rod; 15, first gear; 16, second rotating rod; 17, second gear; 18, rotating plate; 1801, slide groove; 19, sliding block ; 20. Receiving plate; 21. Rotating sleeve; 2101. Vertical groove; 2102. Annular groove; 2103. Spiral groove; 22. First movable plate; 2201. First limit block; 23. Follow-up sleeve; 24. Hollow rod; 25. Movable rod; 26. Guide column; 27. Second movable plate; 2701. Second limit block; 28. First spring; 29. ​​Second spring; 30. Second fixing ring; 31. Follow-up tooth; 32. Limit tooth. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In addition, when an element in the present invention is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and are not intended to be the only embodiment.

[0033] See also Figure 1 to Figure 11 In an embodiment of the present invention, a bridge guardrail overhead working platform based on gantry hoisting includes: A platform bracket 1, and a support plate 2 installed on the top of the platform bracket 1; A hoist 3 is installed on the support plate 2. A steel cable 4 passing through the support plate 2 is wound around the hoist 3. A protective frame 5 is fixedly suspended on the steel cable 4. A bottom plate 6 is fixed to the bottom of the protective frame 5. Among them, a steel cable 4 is wound on the winch 3. During construction, the workers can stand on the base plate 6, and the protective frame 5 can protect the workers. When the winch 3 releases or reels the steel cable 4, the distance between the protective frame 5 and the support plate 2 can be adjusted to control the workers to move to the desired working position. The winch 3 has a self-locking effect. When the winch 3 stops working, the position of the steel cable 4 can be locked to maintain the height of the protective frame 5 and the base plate 6.

[0034] Also includes: See also Figure 1-Figure 3 , Figure 5 , Figure 6 , a synchronous unfolding mechanism is arranged on the support plate 2 and connected to the bottom plate 6, and the synchronous unfolding mechanism can be actuated when the winch 3 reels or releases the steel cable 4 to control the protection frame 5 to move in the vertical direction, and the synchronous unfolding mechanism includes a first supporting sleeve 7 installed on the support plate 2 and symmetrically arranged, a second supporting sleeve 8 is slidably installed in the first supporting sleeve 7, a supporting rod 9 is slidably installed in the second supporting sleeve 8, and the supporting rod 9 is fixedly connected to the bottom plate 6, and a connecting rod connected to the second supporting sleeve 8 is arranged on the first supporting sleeve 7 The scissors-fork assembly comprises a first fixing ring 10 respectively mounted on the first supporting sleeve 7, the second supporting sleeve 8 and the supporting rod 9, and a first rotating rod 11 is rotatably mounted on each of the first fixing rings 10; and further comprises a first hinged rod 12, a second hinged rod 13, and a third hinged rod 14 respectively hinged on each of the first rotating rods 11 and symmetrically arranged, an end of the first hinged rod 12 and an end of the second hinged rod 13 are hinged to each other, and an end of the second hinged rod 13 and an end of the third hinged rod 14 are hinged to each other.

[0035] In detail, when adjusting the height of the protective frame 5, in order to prevent the protective frame 5 from shaking, the protective frame 5 needs to be guided, the first hinged rod 12 is connected to the first support sleeve 7 through the first fixing ring 10, the second hinged rod 13 is connected to the second support sleeve 8 through the first fixing ring 10, and the third hinged rod 14 is connected to the support rod 9 through the first fixing ring 10. The first hinged rod 12, the second hinged rod 13 and the third hinged rod 14 are symmetrically arranged, one of the first hinged rod 12, the second hinged rod 13 and the third hinged rod 14 are respectively fixed to the corresponding first rotating rod 11, and the other The first hinged rod 12, the second hinged rod 13 and the third hinged rod 14 are rotatably installed on the corresponding first rotating rod 11. In the initial state, under the action of the steel cable 4, the distance between the base plate 6 and the support plate 2 is minimized. At this time, the size of the first support sleeve 7, the second support sleeve 8 and the support rod 9 fitting together is the largest, and the angle between the two first hinged rods 12 is the largest. Under the action of the first hinged rod 12, the second hinged rod 13 and the third hinged rod 14, the size of the second support sleeve 8 inserted into the first support sleeve 7 is the same as the size of the support rod 9 inserted into the second support sleeve 8.

[0036] Specifically, when the height of the bottom plate 6 needs to be lowered, the winch 3 will release the steel cable 4. Under the action of gravity, the protective frame 5 and the bottom plate 6 will move in a direction away from the support plate 2, thereby driving the support rod 9 to follow the movement. The support rod 9 will drive the third hinged rod 14 to move. Since the first hinged rod 12, the second hinged rod 13 and the third hinged rod 14 are combined to form a scissor-fork structure, the second hinged rod 13 and the first hinged rod 12 will move synchronously, and the angle formed between the first hinged rod 12 and the second hinged rod 13 and the angle between the second hinged rod 13 and the third hinged rod 14 are equal. The angle formed between them always remains equal. Therefore, when the support rod 9 moves in the direction away from the second support sleeve 8, the second support sleeve 8 will also move in the direction away from the first support sleeve 7, and the size of the support rod 9 separated from the second support sleeve 8 is the same as the size of the second support sleeve 8 separated from the first support sleeve 7. Under the action of the first support sleeve 7, the second support sleeve 8 and the support rod 9, it is ensured that the protective frame 5 will not shake during movement to ensure the safety of the user. When the base plate 6 moves to the required height, the winch 3 stops working and the height of the protective frame 5 is locked by the steel cable 4.

[0037] Preferably, under the action of the scissors assembly, the second support sleeve 8 and the support rod 9 can be synchronously expanded relative to the first support sleeve 7, and the expansion dimensions are the same. The traditional guide sleeve tube usually extends one section of the tube to the end of the stroke, and then the other end of the tube extends. If the protective frame 5 is subjected to external force, the traditional guide sleeve tubes have different fitting dimensions and different rigidities between the sections of the tube. Bending or breaking may occur at the parts where the rigidity of the guide sleeve tube is relatively weak. The present application can realize the equidistant expansion of the second support sleeve 8 and the support rod 9, so that the dimensions of the mutual fitting of the first support sleeve 7 and the second support sleeve 8 and the support rod 9 always remain equal, so that the strength between the various tubes always remains the same, thereby achieving a certain rigidity while guiding the protective frame 5 to ensure that the protective frame 5 will not deviate.

[0038] See also Figure 1-Figure 5 , Figure 7 , Figure 8 , a speed-increasing centrifugal mechanism is arranged on the synchronous unfolding mechanism, the speed-increasing centrifugal mechanism includes a first gear 15 installed on the first rotating rod 11, and a second fixing ring 30 is fixed on the first supporting sleeve 7, the second supporting sleeve 8 and the supporting rod 9 respectively, a second rotating rod 16 is rotatably installed on the second fixing ring 30, a second gear 17 meshing with the first gear 15 is fixed at the end of the second rotating rod 16, and a driven component is arranged on the second rotating rod 16, wherein the driven component includes a rotating plate 18 installed on the second rotating rod 16, the rotating plate 18 is provided with symmetrically arranged sliding grooves 1801, and a sliding block 19 is slidably installed in the sliding groove 1801.

[0039] It should be noted that, in the initial state, under the action of the follow-up adjustment component, the sliding block 19 is located at the end of the stroke on one side of the slide groove 1801, and the distance between the two sliding blocks 19 is the smallest. When adjusting the height of the protective frame 5, in order to ensure the safety of the user, the winding or releasing speed of the steel cable 4 will remain in a reduced state. Therefore, when the scissors assembly moves, it will drive the first rotating rod 11 to rotate, thereby driving the first gear 15 to rotate. The first gear 15 is meshed with the second gear 17, so that the second gear 17 rotates. Under the action of the second gear 17, the second rotating rod 16 is driven to rotate, thereby driving the rotating plate 18 to move. Since the release speed of the steel cable 4 is slow, when the rotating plate 18 rotates around the second rotating rod 16, the centrifugal force on the sliding block 19 is small, and the position of the sliding block 19 in the slide groove 1801 will not change. If the steel cable 4 breaks or When the self-locking of the winch 3 fails, the protective frame 5 will fall rapidly under the action of gravity. Under the action of the scissor assembly, the rotation speed of the first rotating rod 11 increases, thereby increasing the rotation speed of the first gear 15. Since the number of teeth of the first gear 15 is much larger than the number of teeth of the second gear 17, the rotation speed of the second gear 17 will be greatly increased, which increases the movement rate of the rotating plate 18, thereby increasing the centrifugal force on the sliding block 19. Under the action of the centrifugal force, the sliding block 19 slides along the slide groove 1801, and the two sliding blocks 19 move in directions away from each other. Under the action of the sliding block 19, the stall lock mechanism is controlled to move through the follow-up adjustment component to limit the rotation of the first rotating rod 11 through the scissor assembly, thereby fixing the second support sleeve 8 and the support rod 9, so as to achieve the effect of automatically locking the protective frame 5 when the protective frame 5 stalls.

[0040] See also Figure 1-Figure 5 , Figure 7-10 The synchronous unfolding mechanism is also provided with a follow-up adjustment component connected to the speed-increasing centrifugal mechanism, and the follow-up adjustment component includes a receiving plate 20 installed on the second fixed ring 30 and sleeved on the second rotating rod 16, and a rotating sleeve 21 is rotatably installed on the receiving plate 20, and a follow-up sleeve 23 is slidably installed on the rotating sleeve 21; it also includes a hollow rod 24 installed on the sliding block 19, and a movable rod 25 fixedly connected to the follow-up sleeve 23 is slidably installed in the hollow rod 24.

[0041] Further, in the initial state, under the action of the stall lock mechanism, the follower sleeve 23 is located at the end of the stroke away from the receiving plate 20, and under the action of the movable rod 25 and the hollow rod 24, the distance between the two sliding blocks 19 is minimized. If the protective frame 5 stalls, under the action of centrifugal force, the two sliding blocks 19 move in directions away from each other, and the sliding blocks 19 will drive the follower sleeve 23 to move toward the receiving plate 20 through the hollow rod 24 and the movable rod 25, so as to drive the stall lock mechanism to move. Under the action of the stall lock mechanism, the second rotating rod 16 is locked to limit the rotation of the first gear 15 through the second gear 17, thereby limiting the movement of the scissor assembly through the first rotating rod 11, so as to quickly lock the position of the protective frame 5.

[0042] See also Figure 1-Figure 5 , Figure 7-Figure 9 , Fig.11 , a stall lock mechanism is arranged on the speed-increasing centrifugal mechanism and connected to the follow-up adjustment component. The follow-up adjustment component can limit the movement of the synchronous deployment mechanism through the stall lock mechanism when the speed-increasing centrifugal mechanism moves. The stall lock mechanism includes a guide column 26 installed on the receiving plate 20 and symmetrically arranged. A first movable plate 22 and a second movable plate 27 are slidably installed on the guide column 26. The first movable plate 22 is rotatably connected to the follow-up sleeve 23. A follow-up tooth 31 is fixed on the second rotating rod 16. A limiting tooth 32 that cooperates with the follow-up tooth 31 is fixed on the second movable plate 27. A guide component connected to the first movable plate 22 is provided on the rotating sleeve 21, wherein the guide component includes a vertical groove 2101 and an annular groove opened on the circumferential outer wall of the rotating sleeve 21. 2102, the ends of the vertical groove 2101 and the annular groove 2102 are connected to each other, and a first limit block 2201 is fixed on the inner wall of the first movable plate 22 to slide and engage with the vertical groove 2101 and the annular groove 2102, and an elastic structure connected to the first movable plate 22 is provided on the rotating sleeve 21, and the elastic structure mentioned above includes a first spring 28 and a second spring 29 which are sleeved on the rotating sleeve 21, and the two ends of the first spring 28 are respectively abutted against the first movable plate 22 and the second movable plate 27, and the two ends of the second spring 29 are respectively abutted against the second movable plate 27 and the receiving plate 20; it also includes a spiral groove 2103 provided on the circumferential outer wall of the rotating sleeve 21, and a second limit block 2701 which is slidably engaged with the spiral groove 2103 is fixed on the inner wall of the second movable plate 27.

[0043] Furthermore, in the initial state, the first spring 28 and the second spring 29 are both in a compressed state, so that the first movable plate 22 and the second movable plate 27 are both at the end of the stroke away from the receiving plate 20, so that the first limit block 2201 is located on the side of the vertical groove 2101 away from the annular groove 2102, and the second limit block 2701 is located on the side of the spiral groove 2103 away from the receiving plate 20. Under the action of the first movable plate 22, the distance between the follower sleeve 23 and the receiving plate 20 is controlled to be maximum, so that the distance between the two sliding blocks 19 is controlled to be minimum through the hollow rod 24 and the movable rod 25. , under the action of the second movable plate 27, the limiting latch tooth 32 and the follower latch tooth 31 are in a separated state, and the teeth formed on the limiting latch tooth 32 and the follower latch tooth 31 are in a vertical triangular shape. When the protective frame 5 stalls, under the action of centrifugal force, the two sliding blocks 19 are controlled to move in a direction away from each other, and under the action of the hollow rod 24 and the movable rod 25, the follower sleeve 23 moves toward the receiving plate 20 to control the movement of the first movable plate 22. The first movable plate 22 will drive the first limiting block 2201 to move along the length direction of the vertical slot 2101, and the first spring 28 is pressed. When the first limit block 2201 enters the connection position between the vertical groove 2101 and the annular groove 2102, the first spring 28 is elastically released and drives the second movable plate 27 to move toward the receiving plate 20, so as to drive the second limit block 2701 to slide along the spiral groove 2103, so that the rotating sleeve 21 rotates. At this time, the first limit block 2201 will enter the annular groove 2102, and the first limit block 2201 and the annular groove 2102 will be connected. Under the action of 102, the position of the first movable plate 22 is locked, and the second movable plate 27 will also drive the limit tooth 32 to move. When the tooth vertical surface formed by the limit tooth 32 moves to abut against the tooth vertical surface formed by the follower tooth 31, since the limit tooth 32 can only move along the length direction of the guide column 26, under the action of the limit tooth 32 and the follower tooth 31, the second rotating rod 16 is locked, so that the second rotating rod 16 cannot rotate, thereby limiting the rotation of the first rotating rod 11 through the second gear 17 and the first gear 15 to lock the position of the protective frame 5.

[0044] Preferably, when the limiting latch tooth 32 and the follower latch tooth 31 are engaged with each other, since the limiting latch tooth 32 cannot rotate, the limiting latch tooth 32 will lock the second rotating rod 16 through the follower latch tooth 31, and the limiting latch tooth 32 has a large number of teeth. When the rotational inertia of the follower latch tooth 31 is offset, the reaction force acting on the limiting latch tooth 32 can be evenly distributed on each tooth on the limiting latch tooth 32 to increase the locking force on the second rotating rod 16. During the docking process between the limiting latch tooth 32 and the follower latch tooth 31, since the first movable plate 22 does not move, the first spring 28 always provides the second movable plate 27 with a direction toward the receiving plate 20 direction movement force, therefore, can ensure that the limit latch 32 and the follower latch 31 cooperate with each other smoothly, when the stall lock mechanism is effective, each first rotating rod 11 can be locked, therefore, when stalling, the locking force provided by the stall lock mechanism will be evenly distributed on the first support sleeve 7 and the second support sleeve 8 and the support rod 9, so that when the locking force offsets the gravity and inertia force of the protective frame 5 itself, it is borne by multiple first rotating rods 11 respectively, thereby avoiding the problem of deformation or breakage of the stall lock mechanism due to excessive gravity and inertia force to be offset, resulting in locking failure.

[0045] A method for using a bridge guardrail aerial work platform based on gantry hoisting, comprising the following steps: Step 1: Move the platform support 1 to the construction position so that the protection frame 5 and the bottom plate 6 are located at the required working position; Step 2: Under the action of the winch 3, the height of the protection frame 5 and the bottom plate 6 is adjusted through the steel cable 4, and under the action of the synchronous unfolding mechanism, the protection frame 5 is ensured to remain stable during movement; Step 3: When the steel cable 4 breaks or the winch 3 is damaged, causing the protective frame 5 to fall, the speed-increasing centrifugal mechanism drives the follow-up adjustment component to move, thereby driving the stall lock mechanism to move; Step 4: Under the action of the stall lock mechanism, the movement of the synchronous deployment mechanism is restricted to fix the protection frame 5 and the bottom plate 6.

[0046] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0047] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A bridge guardrail aerial work platform based on gantry hoisting, comprising: A platform bracket (1), and a support plate (2) mounted on the top of the platform bracket (1); A winch (3) is mounted on the support plate (2), a steel cable (4) passing through the support plate (2) is wound around the winch (3), a protective frame (5) is fixedly suspended on the steel cable (4), and a bottom plate (6) is fixed at the bottom of the protective frame (5); It is characterized by further comprising: a synchronous unfolding mechanism, arranged on the support plate (2) and connected to the bottom plate (6), the synchronous unfolding mechanism being capable of operating when the hoist (3) reels in or releases the steel cable (4) to control the movement of the protective frame (5) in a vertical direction; A speed-increasing centrifugal mechanism is arranged on the synchronous unfolding mechanism, and the synchronous unfolding mechanism is also provided with a follow-up adjustment component connected to the speed-increasing centrifugal mechanism; The stall lock mechanism is arranged on the speed-increasing centrifugal mechanism and connected to the follow-up adjustment component. When the speed-increasing centrifugal mechanism moves, the follow-up adjustment component can limit the movement of the synchronous deployment mechanism through the stall lock mechanism.

2. The bridge guardrail aerial work platform based on gantry hoisting according to claim 1 is characterized in that: The synchronous unfolding mechanism comprises a first supporting sleeve (7) mounted on the supporting plate (2) and arranged symmetrically, a second supporting sleeve (8) being slidably mounted inside the first supporting sleeve (7), a supporting rod (9) being slidably mounted inside the second supporting sleeve (8), the supporting rod (9) being fixedly connected to the bottom plate (6), and a scissor assembly connected to the second supporting sleeve (8) being arranged on the first supporting sleeve (7).

3. The bridge guardrail aerial work platform based on gantry hoisting according to claim 2 is characterized in that: The scissor lift assembly comprises first fixing rings (10) respectively mounted on the first supporting sleeve (7), the second supporting sleeve (8) and the supporting rod (9), and a first rotating rod (11) is rotatably mounted on each of the first fixing rings (10); It also comprises a first hinged rod (12), a second hinged rod (13), and a third hinged rod (14) which are respectively hinged on each of the first rotating rods (11) and are symmetrically arranged, the end of the first hinged rod (12) and the end of the second hinged rod (13) being hinged to each other, and the end of the second hinged rod (13) and the end of the third hinged rod (14) being hinged to each other.

4. The bridge guardrail aerial work platform based on gantry hoisting according to claim 3 is characterized in that: The speed-increasing centrifugal mechanism comprises a first gear (15) mounted on the first rotating rod (11); second fixing rings (30) are respectively fixed to the first supporting sleeve (7), the second supporting sleeve (8) and the supporting rod (9); a second rotating rod (16) is rotatably mounted on the second fixing ring (30); a second gear (17) meshing with the first gear (15) is fixed at the end of the second rotating rod (16); and a driven assembly is arranged on the second rotating rod (16).

5. The bridge guardrail aerial work platform based on gantry hoisting according to claim 4 is characterized in that: The driven assembly comprises a rotating plate (18) mounted on the second rotating rod (16), the rotating plate (18) being provided with symmetrically arranged sliding grooves (1801), and a sliding block (19) being slidably mounted in the sliding groove (1801).

6. The bridge guardrail aerial work platform based on gantry hoisting according to claim 5 is characterized in that: The follow-up adjustment assembly comprises a receiving plate (20) mounted on the second fixing ring (30) and sleeved on the second rotating rod (16); a rotating sleeve (21) is rotatably mounted on the receiving plate (20); and a follow-up sleeve (23) is slidably mounted on the rotating sleeve (21); It also comprises a hollow rod (24) mounted on the sliding block (19), wherein a movable rod (25) fixedly connected to the follower sleeve (23) is slidably mounted in the hollow rod (24).

7. The bridge guardrail aerial work platform based on gantry hoisting according to claim 6 is characterized in that: The stall lock mechanism comprises a guide column (26) mounted on the receiving plate (20) and arranged symmetrically, a first movable plate (22) and a second movable plate (27) being slidably mounted on the guide column (26), the first movable plate (22) being rotationally connected to the follower sleeve (23), a follower tooth (31) being fixed on the second rotating rod (16), a limit tooth (32) cooperating with the follower tooth (31) being fixed on the second movable plate (27), and a guide assembly connected to the first movable plate (22) being arranged on the rotating sleeve (21).

8. The bridge guardrail aerial work platform based on gantry hoisting according to claim 7 is characterized in that: The guide assembly comprises a vertical groove (2101) and an annular groove (2102) formed on the circumferential outer wall of the rotating sleeve (21); the ends of the vertical groove (2101) and the annular groove (2102) are connected to each other; a first limit block (2201) is fixed to the inner wall of the first movable plate (22) and is slidably engaged with the vertical groove (2101) and the annular groove (2102); and an elastic structure connected to the first movable plate (22) is provided on the rotating sleeve (21).

9. The bridge guardrail aerial work platform based on gantry hoisting according to claim 8 is characterized in that: The elastic structure comprises a first spring (28) and a second spring (29) which are sleeved on the rotating sleeve (21), the two ends of the first spring (28) respectively abutting against the first movable plate (22) and the second movable plate (27), and the two ends of the second spring (29) respectively abutting against the second movable plate (27) and the receiving plate (20); It also includes a spiral groove (2103) formed on the circumferential outer wall of the rotating sleeve (21), and a second limiting block (2701) slidably engaged with the spiral groove (2103) is fixed on the inner wall of the second movable plate (27).

10. A method for using a bridge guardrail aerial work platform based on gantry hoisting, using the bridge guardrail aerial work platform based on gantry hoisting as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: Step 1: Move the platform support (1) to the construction position so that the protection frame (5) and the bottom plate (6) are located at the required working position; Step 2: Under the action of the winch (3), the height of the protection frame (5) and the bottom plate (6) are adjusted through the steel cable (4), and under the action of the synchronous unfolding mechanism, the protection frame (5) is ensured to remain stable during movement; Step 3: When the steel cable (4) breaks or the winch (3) is damaged, causing the protective frame (5) to fall, the speed-increasing centrifugal mechanism drives the follow-up adjustment component to move, thereby driving the stall lock mechanism to move; Step 4: Under the action of the stall lock mechanism, the movement of the synchronous deployment mechanism is restricted to fix the protection frame (5) and the bottom plate (6).

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