A foldable cage ladder with a footboard

Abstract

This invention relates to a foldable cage ladder for drilling rigs, and particularly to a foldable cage ladder with footboards. The cage ladder frame has footboards I and II on its side. Footboard I is connected to an angle steel section on one side of the cage ladder frame via hinges I. A fixing plate is connected to the lower end of a side beam on one side of the cage ladder frame, supporting the lower end of footboard I. Footboard I and footboard II are connected via multiple hinges II. Multiple sliding sleeves are connected to the outer side of footboard II, and these sleeves are fitted onto sliding rods and can slide along the rods. The sliding rods are fixed to a side bar on one side of the cage ladder frame. This invention allows operators to step on the footboards while the drilling rig is horizontally mounted, improving operator safety. With the assistance of a crane, the cage ladder and footboards can be folded synchronously in a single action, making operation simple and convenient.

Description

Technical fields:

[0001] This invention relates to a foldable cage ladder for drilling rigs, and particularly to a foldable cage ladder with a footboard. Background technology:

[0002] Western Drilling Company urgently needs two 7,000-meter high clearance base drilling rigs. Since the effective height of the drilling rig derrick is 48 meters, the actual height is 58.35 meters. The horizontal installation is relatively long, so a folding cage ladder needs to be installed on the drilling rig derrick to facilitate the construction and operation of workers.

[0003] The patent title is "A Folding Cage Ladder," application number 202120937504.1, which discloses a folding cage ladder. It includes a straight ladder and a set of folding cage frames arranged along the length of the straight ladder. Each folding cage frame includes a pair of first connecting rods respectively hinged to both sides of the straight ladder and capable of rotating towards the inside of the ladder. Second connecting rods are respectively hinged to the free ends of the first connecting rods, with the rotation direction of the second connecting rods opposite to that of the first connecting rods connected to them. The folding cage frame also includes a top connecting rod, with both ends hinged to the ends of the two second connecting rods away from the first connecting rods. A first locking member is provided at the hinge point between the first and second connecting rods to lock the first and second connecting rods together. A second locking member is provided at the hinge point between the first connecting rod and the straight ladder to lock the first connecting rod and the straight ladder together. This cage ladder can form a cage ladder protection within the derrick base, ensuring the safety of operators. Furthermore, its small thickness after folding avoids interference with the derrick base during installation.

[0004] The patent, titled "Folding and Flipping Cage Ladder," application number 201620039669.6, discloses a folding and flipping cage ladder comprising ladder legs connected to a hoist frame. Multiple treads are spaced apart between the ladder legs, and multiple corresponding lugs are spaced apart on each ladder leg. Each lug is rotatably connected to a protective ring. A connecting rod is rotatably connected to the center of each protective ring via a pin. The connecting rod connects the protective rings located on both sides of the treads together. A ring is located at the other end of each protective ring, and a chain is provided inside the ring for connecting the two ends of the cage ladder. The two ends of the chain are fixedly connected to the protective rings at the ends of the cage ladder. A connecting chain is fixedly connected between the connecting rod and the ladder legs. This cage ladder allows the protective rings to be flipped and stacked, thus saving space and facilitating transportation.

[0005] Patent application number 201420436243.5 discloses a foldable cage ladder device for derricks, comprising a ladder, a foldable protective cage, and a deployment frame. The foldable protective cage is fixedly connected to the ladder via a fixing plate. The deployment frame is connected to a power unit at one end and to the foldable protective cage at the other end via a steel wire rope. The foldable protective cage consists of a pulley assembly one, a column, a horizontal ring, a connecting longitudinal beam, and a fixing plate. The deployment frame consists of a frame body, a pulley assembly two, a connecting beam, and a pulley assembly three. This cage ladder device uses a power unit and a pulley mechanism to fold the protective cage, making it convenient to use and flexible in deployment and retrieval.

[0006] The existing folding cage ladders do not have footboards for construction workers when laid horizontally on the derrick, posing a safety hazard. There is a need to develop a folding cage ladder with footboards to improve the safety of construction workers. Summary of the Invention:

[0007] The technical problem this invention aims to solve is to provide a foldable cage ladder with a footboard. This device allows construction workers to operate while standing on the footboard when the derrick is horizontally installed, improving the safety of the workers. With the assistance of a crane, the cage ladder and footboard can be folded synchronously in a single action, making operation simple and convenient. This overcomes the shortcomings of existing folding cage ladders, which require workers to stand on the crossbars of the cage ladder when it is horizontally installed on the derrick, posing a safety hazard.

[0008] The technical solution adopted in this invention is as follows: a foldable cage ladder with steps, comprising a cage ladder frame, the cage ladder frame including two parallel side beams and two parallel connecting side bars, multiple step crossbars evenly connected between the two side beams, multiple angle steels with slotted outer sides symmetrically connected to the outer sides of the two side beams, the upper ends of the two vertical beams of the open frame respectively set at the slots of the angle steel and rotatably connected to the angle steel with bolts, the lower ends of the two vertical beams of the open frame respectively rotatably connected to the two connecting side bars with bolts; the side of the cage ladder frame is provided with step I and step II, step I is connected to the angle steel on one side of the cage ladder frame by hinges. Connected to step I, a fixed plate is connected to the lower end of the side beam on one side of the cage ladder frame. The fixed plate supports the lower end of step I. Step I and step II are connected by multiple hinges II. Multiple sliding sleeves are connected to the outside of step II. The sliding sleeves are fitted onto the sliding rod and can slide along the sliding rod. The sliding rod is fixed to the side rod on one side of the cage ladder frame. The lower end of the side rod is equipped with a non-removable limit pin and a removable limit pin. A movable limit plate is fitted onto the non-removable limit pin and can rotate around the non-removable limit pin. The movable limit plate can be fixed to the side rod by the removable limit pin and a pin. When the movable limit plate is fixed to the side rod, it supports the lower end of step II.

[0009] Furthermore, pedal I and pedal II are made of steel grating.

[0010] Furthermore, hinge I is welded to pedal I and the angle steel on one side of the cage ladder frame, and hinge II is welded to pedal I and pedal II.

[0011] The beneficial effects of this invention are:

[0012] 1. A footboard was designed so that construction workers can step on it to operate when the derrick is horizontally installed, thereby improving the safety of the construction workers.

[0013] 2. With the assistance of a crane, the cage ladder and the steps can be folded synchronously in one action without the need for additional folding action;

[0014] 3. The pedal is supported by the bottom limiting plate to prevent the hinge from being stressed. Attached image description:

[0015] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0016] Figure 1 This is a schematic diagram of the structure of the present invention.

[0017] Figure 2 for Figure 1 Enlarged diagram of point A in the middle.

[0018] Figure 3 for Figure 1 Enlarged diagram of point B in the middle. Detailed implementation method:

[0019] like Figure 1 , Figure 2 , Figure 3As shown, a foldable cage ladder with treads includes a cage ladder frame 1. The cage ladder frame 1 includes two parallel side beams 15 and two parallel connecting side bars 18. Multiple step crossbars 16 are evenly connected between the two side beams 15. Multiple angle steels 4 with slotted outer sides are symmetrically connected to the outer sides of the two side beams 15. The upper ends of the two vertical beams of the open frame 17 are respectively set at the slots of the angle steels 4 and are rotatably connected to the angle steels 4 by bolts 3. The lower ends of the two vertical beams of the open frame 17 are respectively rotatably connected to the two connecting side bars 18 by bolts 3. Treads I 7 and II 8 are provided on the side of the cage ladder frame 1. Treads I 7 are connected to the angle steels 4 on one side of the cage ladder frame 1 by hinges I 5. The lower end of the side beam 15 is connected to the fixed plate 2, which supports the lower end of the pedal I 7. The pedal I 7 and the pedal II 8 are connected by multiple hinges II 6. Multiple sliding sleeves 10 are connected to the outside of the pedal II 8. The sliding sleeves 10 are fitted on the sliding rod 9 and can slide along the sliding rod 9. The sliding rod 9 is fixed on the side rod 18 on one side of the cage ladder frame 1. The lower end of the side rod 18 is equipped with a non-removable limiting pin 11 and a removable limiting pin 12. The movable limiting plate 13 is fitted on the non-removable limiting pin 11 and can rotate around the non-removable limiting pin 11. The movable limiting plate 13 can be fixed on the side rod 18 by the removable limiting pin 12 and the pin 14. When the movable limiting plate 13 is fixed on the side rod 18, it supports the lower end of the pedal II 8.

[0020] The pedals I7 and II8 are made of steel grating.

[0021] The hinge I5 is welded to the footplate I7 ​​and the angle steel 4 on one side of the cage ladder frame 1, and the hinge II6 is welded to the footplate I7 ​​and the footplate II8.

[0022] When the cage ladder frame 1 is folded, all open frames 17 tilt and rotate. At this time, the slide rod 9 moves with the side rod 18 on one side of the cage ladder frame 1, and the sliding sleeve 10 slides relative to the slide rod 9, ensuring that the positions of the pedals I7 and II8 in the vertical direction of the cage ladder remain unchanged. At the same time, the pedals I7 and II8 are folded around the hinge II6 welded in the middle to achieve the opening and closing method. After folding to the correct position, the fixed plate 2 welded to the lower end bears the weight of the pedal I7, preventing the hinge from being stressed and protecting the weld of the hinge I5 between the pedal I7 and the cage ladder frame 1. The movable limiting plate 13, connected by the non-removable limiting pin 11, the removable limiting pin 12, and the pin 14, bears the weight of the pedal II8, preventing the hinge from being stressed and protecting the weld of the hinge II6 between the pedals I7 and II8. Since the movable limiting plate 13 blocks the folding of the cage ladder frame 1, when folding, the detachable limiting pin 12 and the pin 14 are removed, and the movable limiting plate 13 is flipped to one side around the non-detachable limiting pin 11, so as not to hinder the flipping of the cage ladder frame 1.

[0023] The foldable pedal of the present invention can be folded synchronously with the folding of the cage ladder, without the need for additional folding action.

[0024] The pedal adopts a structure in which the sliding rod 9 and the sliding sleeve 10 cooperate. When the cage ladder is folded, the sliding rod 9 moves accordingly, while the pedal and the sliding sleeve 10 remain relatively stationary, thus resolving the contradiction between the arc folding trajectory of the cage ladder and the opening and closing folding trajectory of the pedal.

[0025] After the foldable pedal is flipped into place, the weight of the pedal is supported by two limiting plates at the bottom, protecting the connecting hinges and improving the safety of the equipment.

[0026] The bottom is provided with two limiting plates, one of which prevents the cage ladder from folding. The movable limiting plate 13 can be rotated around the non-removable pin 11 by removing the detachable limiting pin 12, thus avoiding the folding trajectory of the cage ladder and preventing the loss of parts.

[0027] It is understood that the above specific description of the present invention is only for illustrating the present invention and is not limited to the technical solutions described in the embodiments of the present invention. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to the present invention to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of the present invention.

Claims

1. A foldable ladder with pedal, comprising a ladder frame (1), the ladder frame (1) comprising two parallel arranged side beams (15) and two parallel arranged connecting side rods (18), a plurality of step crossbars (16) are uniformly connected between the two side beams (15), a plurality of outer side slotted angle steels (4) are symmetrically connected outside the two side beams (15), an open frame (17) is arranged at the slotted portion of the angle steel (4) at the upper end of the two vertical beams of the open frame (17) and is rotatably connected with the angle steel (4) through a bolt (3), the lower end of the two vertical beams of the open frame (17) is rotatably connected with the two connecting side rods (18) through a bolt (3); characterized in that: The cage ladder frame (1) is provided with a step I (7) and a step II (8) on the side, the step I (7) and the angle steel (4) on one side of the cage ladder frame (1) are connected through a hinge I (5) respectively, the lower end of the edge beam (15) on one side of the cage ladder frame (1) is connected with a fixed clamping plate (2), the fixed clamping plate (2) supports the lower end of the step I (7), the step I (7) and the step II (8) are connected through a plurality of hinges II (6), the step II (8) is connected with a plurality of sliding sleeves (10) on the outside, the sliding sleeves (10) are sleeved on the slide rod (9) and can slide along the slide rod (9), the slide rod (9) is fixed on the connecting side rod (18) on one side of the cage ladder frame (1), the non-detachable limiting pin (11) and the detachable limiting pin (12) are installed on the lower end of the connecting side rod (18), the movable limiting plate (13) is sleeved on the non-detachable limiting pin (11) and can rotate around the non-detachable limiting pin (11), the movable limiting plate (13) can be fixed on the connecting side rod (18) through the detachable limiting pin (12) and a safety pin (14), and the movable limiting plate (13) supports the lower end of the step II (8) when being fixed on the connecting side rod (18).

2. The foldable ladder with steps according to claim 1, characterized in that: The step I (7) and the step II (8) are made of steel grating.

3. The foldable ladder with steps according to claim 1, characterized in that: The hinge I (5) is welded with the step I (7) and the angle steel (4) on one side of the cage ladder frame (1) respectively, and the hinge II (6) is welded with the step I (7) and the step II (8) respectively.

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