Adjustable safety crawling ladder for constructional engineering

Abstract

The invention discloses an adjustable safety crawling ladder for constructional engineering, which comprises a climbing frame mechanism and a base, the base comprises a supporting piece and two oppositely arranged supporting seats, the climbing frame mechanism is fixedly mounted on the supporting piece, each supporting seat is connected with the supporting piece through a movable rod, at least one part of the movable rod is nested in the supporting piece, and the supporting piece is fixedly mounted on the climbing frame mechanism. Each movable rod can do horizontal telescopic motion relative to the corresponding supporting piece so as to drive the corresponding supporting base connected with the movable rod to move by a preset distance in the horizontal direction, and therefore the two supporting bases can make contact with the ground. Through the telescopic design, the ladder stand can adapt to different terrains by adjusting the structure of the ladder stand, so that a relatively stable supporting state is kept all the time, the gravity center of the ladder stand is prevented from shifting, the risk that constructors fall down due to inclination of the ladder stand in the climbing process is reduced, and the occurrence probability of high-altitude falling accidents is greatly reduced.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and more specifically to an adjustable safety ladder for building engineering. Background Art

[0002] In the process of construction, ladders are key tools for construction workers to reach high places for work, and their performance directly affects construction safety and efficiency. However, the current construction ladders on the market, whether foldable or with rollers, have some technical problems that have a significant impact on the safety and progress of construction.

[0003] First, in terms of terrain adaptability, the ground conditions at construction sites are complex and changeable, including potholes, uneven or damaged surfaces. Existing ladders are difficult to maintain horizontal stability under such conditions. When a ladder is placed on an uneven ground, the force distribution on the support points is uneven, which can easily cause the ladder to tilt. For example, in the renovation of old residential areas, there may be height differences or depressions on the ground. After being placed, some of the supporting feet of the ladder are prone to hanging in the air or sinking into the ground, causing the overall center of gravity to shift. In this case, construction workers may fall due to the tilt of the ladder during the climbing process.

[0004] Secondly, in terms of supporting structure design, when construction workers are working on ladders, their body movements will exert additional force on the ladders, and the supporting structure design of many ladders is relatively simple and cannot effectively cope with these dynamic loads. This design defect may cause the ladder to shake or become unstable during use, thereby increasing the probability of safety accidents. Summary of the invention

[0005] In order to overcome the deficiencies of the prior art, the present invention provides an adjustable safety ladder for construction engineering to solve the problem that the existing ladders for construction engineering have poor terrain adaptability.

[0006] The technical solution of the present invention is as follows: An adjustable safety ladder for construction engineering, comprising: A climbing frame mechanism, the climbing frame mechanism comprising a plurality of frames nested in sequence along the vertical direction, at least one of the frames being able to be expanded or contracted along the vertical direction; A base, the base includes a support member and two relatively arranged support seats, the climbing frame mechanism is fixedly mounted on the support member, each of the support seats is connected to the support member through a movable rod, at least a portion of the movable rod is nested in the support member, each of the movable rods can be horizontally telescopically moved relative to the support member to drive the support seat connected thereto to move a predetermined distance in the horizontal direction, so that the two support seats are in contact with the ground.

[0007] Furthermore, it also includes a locking assembly, which is symmetrically arranged on both sides of each of the frames, and in two adjacent frames, the locking assembly of the side wall of the frame located at the lower layer locks the frame located at the upper layer; the locking assembly has a locked state and an unlocked state, when the locking assembly of the side wall of the frame located at the lower layer is in the unlocked state, the locking assembly is disengaged from the pin hole of the frame located at the upper layer, so that the frame located at the upper layer can be pulled to unfold in the vertical direction; when the locking assembly of the side wall of the frame located at the lower layer is in the locked state, the frame located at the upper layer is fixed.

[0008] Further, the locking assembly includes a toggle frame, a pin rod and a spring, the toggle frame is hinged to the side wall of the frame body through a rotating shaft, one end of the toggle frame is provided with a pressing portion, and the other end of the toggle frame is provided with a transmission portion; the pin rod is hinged to the transmission portion, and in two adjacent frames, the pin rod can pass through the mounting hole of the frame body located at the lower layer in the horizontal direction and be inserted into the pin hole of the frame body located at the upper layer, one end of the spring is fixed to the side wall of the frame body, and the other end of the spring is connected to the pressing portion of the toggle frame; When the pressing portion of the toggle frame is pressed, the transmission portion tilts up to drive the pin rod to disengage from the pin hole, the spring is compressed, and the locking assembly is in an unlocked state; After the pressing is released, the spring pushes the pressing part to return to its original position, and the pin rod is inserted into the pin hole to complete the locking.

[0009] Furthermore, a gantry is fixedly installed on the top of the frame body located at the top, and hooks for overlapping with the wall are arranged on both sides of the gantry.

[0010] Furthermore, a bracket is provided on the side wall of the gantry, and the hook is installed on the bracket. The hook includes a fixed seat, a hook body, a first adjusting knob and a second adjusting knob. The fixed seat is detachably mounted on the mounting hole of the bracket, and the hook body has an axially extending guide rod portion and a hanging portion, and the guide rod portion is inserted into a guide groove of the fixed seat, and the lower surface of the guide rod portion is provided with equidistantly arranged serrated hanging teeth, and the tooth tip angle of the serrated hanging teeth is 40°~50°. The first adjusting knob is connected to the guide rod portion to adjust the extension length of the guide rod portion, and the second adjusting knob is used to adjust the placement angle of the hook body.

[0011] Furthermore, the spring is a helical compression spring, and the preload force of the spring causes the pin rod to generate a locking force of no less than 50N when the pin rod is inserted into the pin hole.

[0012] Furthermore, the climbing frame mechanism also includes a sliding column and a connecting seat, the sliding column and the connecting seat are connected, the frame body located at the lowest layer is sleeved on the sliding column, and the connecting seat is connected to the support member.

[0013] Furthermore, the side wall of the sliding column is provided with a plurality of linearly arranged sockets, and the side wall of the frame body located at the bottom layer is provided with a pin, and at least a part of the pin is inserted into the socket to achieve the connection between the frame body and the sliding column.

[0014] Furthermore, an anti-skid pad is provided at the bottom of the support seat, and the bottom surface of the anti-skid pad is provided with triangular anti-skid patterns that are staggered, and the anti-skid pad is connected to a threaded hole reserved at the bottom of the support seat by a bolt.

[0015] Furthermore, the frame is made of aluminum alloy profile or carbon steel profile, the cross-section of the frame is a rectangular hollow structure, and the inner wall of the frame is provided with longitudinal reinforcing ribs, and the thickness of the longitudinal reinforcing ribs is 1.2 to 1.5 times the thickness of the frame wall.

[0016] The present invention according to the above scheme has the following beneficial effects: The present invention provides an adjustable safety ladder for construction engineering, wherein the climbing frame mechanism is composed of a plurality of frames nested in sequence in the vertical direction, and at least one frame can be expanded or retracted in the vertical direction. This design enables the ladder to be flexibly adjusted according to different construction height requirements, and the retractable frame can be expanded to increase the overall height of the ladder; and the frame can be retracted for easy carrying and storage. Compared with traditional fixed-height ladders, the ladder has enhanced terrain adaptability and portability for different construction height requirements.

[0017] The present invention provides an adjustable safety ladder for construction engineering, wherein the base includes a support member and two support seats arranged opposite to each other, each support seat being connected to the support member through a movable rod, at least a portion of the movable rod being nested in the support member and being able to telescopically move horizontally relative to the support member. When facing an uneven ground, that is, when the ground on one side is higher and the ground on the other side is lower, the support seat on the lower side can be extended outward through the movable rod until both support seats can be in close contact with the ground and remain stable, thereby effectively solving the problem of an unstable state of "three-point suspension" that is prone to occur on uneven terrain. The ladder can adjust its own structure to adapt to different terrains through a retractable design, thereby always maintaining a relatively stable support state, thereby avoiding the deviation of the center of gravity of the ladder, reducing the risk of construction personnel falling due to the inclination of the ladder during climbing, and greatly reducing the probability of falling accidents from heights. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 This is one of the structural schematic diagrams of a ladder for construction in an embodiment of the present invention; Figure 2 This is a second structural schematic diagram of a ladder for construction in an embodiment of the present invention; Figure 3 for Figure 2 A local enlarged schematic diagram; Figure 4 It is a schematic diagram of the structure decomposition of a ladder for construction in an embodiment of the present invention; Figure 5 for Figure 4 B is a partial enlarged schematic diagram; Figure 6 for Figure 4 A partial enlarged schematic diagram of C.

[0020] In the figure, 1. climbing frame mechanism; 11. frame body; 12. sliding column; 121. socket; 13. connecting seat; 14. latch; 2. base; 21. support member; 22. supporting seat; 23. movable rod; 3. locking assembly; 31. toggle frame; 311. pressing part; 312. transmission part; 32. pin rod; 33. spring; 4. gantry; 41. bracket; 5. hook; 51. fixing seat; 52. hook body; 521. guide rod part; 5211. serrated hanging teeth; 522. hanging part; 53. first adjusting knob; 54. second adjusting knob. DETAILED DESCRIPTION

[0021] The following detailed description of the embodiments of the present invention is provided in conjunction with the accompanying drawings and examples. The following detailed description of the embodiments and the accompanying drawings are used to illustrate the principles of the present invention, but cannot be used to limit the scope of the present invention, that is, the present invention is not limited to the described embodiments.

[0022] In order to better understand the present invention, the present invention is further described below in conjunction with the accompanying drawings and embodiments: See also Figure 1 As shown, an adjustable safety ladder for construction engineering provided by an embodiment of the present invention includes a climbing frame mechanism 1 and a base 2, and the climbing frame mechanism 1 is installed on the base 2.

[0023] The climbing frame mechanism 1 includes a plurality of frames 11 nested in sequence along the vertical direction, and at least one frame 11 can be expanded or contracted along the vertical direction; wherein, the number of frames 11 is 2 to 7, and the cross-sectional size of each frame 11 increases step by step from top to bottom, and adjacent frames 11 can be telescopically matched.

[0024] The base 2 includes a support member 21 and two oppositely arranged support seats 22. The climbing frame mechanism 1 is fixedly mounted on the support member 21. Each support seat 22 is connected to the support member 21 through a movable rod 23. At least a portion of the movable rod 23 is nested in the support member 21. Each movable rod 23 can be horizontally telescopically moved relative to the support member 21 to drive the support seat 22 connected thereto to move a predetermined distance in the horizontal direction so that the two support seats 22 are in contact with the ground.

[0025] Specifically, the base 2 of the ladder provided in this embodiment adopts a nested structure of movable rods 23, and the support seat 22 can be horizontally extended and retracted along the support member 21. When there is a height difference between the ground (for example, the left side is high and the right side is low), the low-side support seat 22 can be stretched outward to expand the lateral span, so that the support seats 22 on both sides can form effective contact with the ground, so that the support points that may have been suspended in the air can regain the ground reaction force, completely eliminating the hidden danger of "three points hanging in the air".

[0026] In this embodiment, the nested structure of the movable rod 23 and the support member 21 adopts a clearance fit design (with a tolerance of about 0.1mm~0.3mm), which ensures smooth extension and retraction and effective load transmission. When the support seat 22 contacts the ground, the support seat 22 and the movable rod 23 form a rigid support system, and the position is locked by the friction force (friction coefficient μ≥0.15) between the movable rod 23 and the support member 21 to ensure that it will not retract when subjected to force.

[0027] The accident rate caused by the tilt of traditional ladders is about 1.2 times / thousand working hours. By using the portable construction ladder provided by this application, the accident rate can be reduced to 0.3 times / thousand working hours by improving stability. A single project (10 people × 6 months) can reduce direct economic losses by approximately RMB 240,000.

[0028] See also Figure 1~Figure 2 As shown, the construction ladder also includes a locking assembly 3, which is symmetrically arranged on both sides of each frame 11. In two adjacent frames 11, the locking assembly 3 of the side wall of the frame 11 located at the lower layer locks the frame 11 located at the upper layer; the locking assembly 3 has a locked state and an unlocked state. When the locking assembly 3 of the side wall of the frame 11 located at the lower layer is in the unlocked state, the locking assembly 3 is disengaged from the pin hole of the frame 11 located at the upper layer, so that the frame 11 located at the upper layer can be pulled to unfold in the vertical direction; when the locking assembly 3 of the side wall of the frame 11 located at the lower layer is in the locked state, the frame 11 located at the upper layer is fixed.

[0029] Specifically, by symmetrically arranging locking components 3 on both sides of each frame 11, and the locking components 3 on the side walls of the lower frame 11 can lock the upper frame 11, the multi-layer ladder can form a stable overall structure after construction is completed. When construction workers climb, there will be no instability such as shaking or displacement between the frames 11, which effectively reduces the risk of safety accidents caused by loose ladders.

[0030] During the construction process, the load on the ladder is not static. When construction workers carry tools and materials up and down, and move heavy objects, instantaneous impact force and unbalanced force will be generated. The ladder for construction provided in this embodiment adopts the above-mentioned structural design, which can ensure that each layer of the frame 11 is tightly connected, and these dynamic loads are evenly distributed on the entire ladder structure, avoiding local excessive force that causes deformation or even collapse of the frame 11.

[0031] For further explanation, this embodiment also provides a method for using a construction ladder, which is as follows: 1. Unlock to achieve rapid deployment: When it is necessary to build or adjust the height of the ladder, the locking component 3 on the side wall of the lower frame 11 is disengaged from the pin hole of the upper frame 11. At this time, the locking component 3 is in an unlocked state, so that the upper frame 11 can be pulled and deployed in the vertical direction. Construction workers do not need to use complicated tools or spend a lot of time on disassembly and reinstallation. Only by simply operating the locking component 3, the working height of the ladder can be quickly changed to adapt to the height requirements of different floors and construction sites, greatly improving construction efficiency.

[0032] 2. Locking ensures immediate fixation: After the ladder is adjusted to a suitable height, the locking component 3 is switched to the locked state, and the upper frame 11 is fixed to ensure that the ladder always remains stable during subsequent use and will not become loose due to accidental collisions, slight vibrations, etc., thereby ensuring construction continuity and personnel safety.

[0033] See also Figure 3 As shown, the locking assembly 3 includes a toggle frame 31, a pin rod 32 and a spring 33. The toggle frame 31 is hinged to the side wall of the frame body 11 through a rotating shaft. A pressing portion 311 is provided at one end of the toggle frame 31, and a transmission portion 312 is provided at the other end of the toggle frame 31. The pin rod 32 is hinged to the transmission portion 312. In two adjacent frames 11, the pin rod 32 can pass through the mounting hole of the frame body 11 located at the lower layer in the horizontal direction and be inserted into the pin hole of the frame body 11 located at the upper layer. One end of the spring 33 is fixed to the side wall of the frame body 11, and the other end of the spring 33 is connected to the pressing portion 311 of the toggle frame 31. When the pressing portion 311 of the toggle frame 31 is pressed, the transmission portion 312 tilts up to drive the pin rod 32 to disengage from the pin hole, the spring 33 is compressed, and the locking assembly 3 is in an unlocked state; After the pressing is released, the spring 33 pushes the pressing portion 311 to return to its original position, and the pin rod 32 is inserted into the pin hole to complete the locking.

[0034] Specifically, in the locked state, the pin rod 32 is inserted into the pin hole of the upper frame 11, preventing the relative movement between the upper and lower frames 11. At this time, the spring 33 is in a compressed state, and its axis is set at an angle of 30° to 60° with the movement direction of the pin rod 32. The preload force of the spring 33 causes the pin rod 32 to generate a locking force of not less than 50N when inserted into the pin hole.

[0035] When the pressing part 311 of the toggle frame 31 is pressed, a force acts on the pressing part 311, and the toggle frame 31 rotates around the rotation axis with the rotation axis as the fulcrum. At this time, the power is the external force applied to the pressing part 311, which causes the transmission part 312 at the other end of the toggle frame 31 to tilt up. The transmission part 312 is hinged to the pin rod 32, so the tilting of the transmission part 312 drives the pin rod 32 to move horizontally, thereby disengaging from the pin hole. At the same time, the spring 33 is compressed to store elastic potential energy. In this process, the force changes the motion state of the toggle frame 31 (from static to rotation), thereby changing the position of the pin rod 32 to achieve unlocking.

[0036] After the pressure is released, the spring 33 has elastic potential energy due to being compressed. The spring 33 applies elastic force to the pressing part 311, and forms a power to rotate the toggle frame 31 with the rotating shaft as the fulcrum. The toggle frame 31 rotates in the opposite direction around the rotating shaft under the action of the elastic force of the spring 33, driving the transmission part 312 to descend, and then pushing the pin rod 32 to be inserted into the pin hole again.

[0037] In one embodiment, the inner wall of the pin hole is provided with a tapered guide surface, and the insertion end of the pin rod 32 is provided with a chamfer matching the tapered guide surface, and the chamfer angle is 15° to 30°. With this design, the pin rod 32 can be guided to align with the pin hole through the tapered guide surface of the pin hole and the chamfer of the insertion end of the pin rod 32, which reduces the difficulty of alignment during insertion, makes it easier to insert the pin rod 32 into the pin hole, and improves the accuracy and efficiency of installation. It is worth mentioning that if there is no such guide structure, the position of the pin rod 32 needs to be adjusted multiple times when it is inserted, which wastes time and may damage the pin rod 32 or the pin hole.

[0038] The conical guide surface and the chamfer form a tapered fit, and when the pin 32 is inserted, the chamfer of the pin 32 contacts the conical guide surface to generate a radial guiding force. Even if there is a slight positional deviation between the pin 32 and the pin hole (such as horizontal offset or angle tilt), the conical surface can automatically guide the pin 32 to the center position to achieve self-correction.

[0039] Normal force F at the chamfered contact point between the tapered guide surface and the pin 32 N Can be decomposed into axial force F 轴 =F N× cosθ and radial force F 径 =FN× sinθ.

[0040] If the chamfer angle is less than 15°, the radial force F at the chamfer contact point between the tapered guide surface and the pin 32 is 径 If it is too small, the guiding effect will be weakened and the contact area will be insufficient, which may easily lead to local high-pressure wear.

[0041] If the chamfer angle is greater than 30°, the normal force F at the chamfer contact point between the tapered guide surface and the pin 32 is N Significantly increased (due to F N =F 轴 / cosθ), resulting in a friction force F f =μF N Raising the angle will increase the operating force. At the same time, too large a chamfer will weaken the elastic correction ability of the radial force component. Therefore, the insertion end of the pin rod 32 provided in this embodiment is provided with a chamfer matching the conical guide surface, and the chamfer angle is preferably 15° to 30°.

[0042] In one embodiment, the contact surface between the pin rod 32 and the pin hole is coated with a solid lubricating layer of molybdenum disulfide, the thickness of the lubricating layer is 0.05 mm to 0.1 mm, and the friction coefficient is less than or equal to 0.15. Molybdenum disulfide is a material with a layered structure, and the bonding force between the layers is weak. When the layers move relative to each other, slippage easily occurs between the layers, which makes it have good lubrication performance. When the pin rod 32 and the pin hole move relative to each other, the interlayer slippage of the molybdenum disulfide lubricating layer can effectively reduce the friction resistance of the contact surface, so that the friction coefficient is reduced from a higher value to less than or equal to 0.15, which greatly reduces the friction force, thereby reducing the degree of wear on the contact surface between the pin rod 32 and the pin hole.

[0043] It should be noted that the thickness of the lubricating layer is 0.05mm~0.1mm. This design can form an effective isolation layer between the pin rod 32 and the pin hole, which not only ensures that there is enough lubricating material to maintain the lubrication effect, but also does not cause the matching accuracy to decrease due to excessive thickness. If the lubricating layer is too thin, it is difficult to completely cover the contact surface, so that some areas are still in a direct contact friction state; if the lubricating layer is too thick, when the pin rod 32 and the pin hole move relative to each other, a large extrusion deformation will occur, affecting the relative movement of the pin rod 32 and the pin hole.

[0044] See also Figure 1 As shown, a gantry 4 is fixedly installed on the top of the frame 11 at the top, and hooks 5 for overlapping with the wall are arranged on both sides of the gantry 4.

[0045] Among them, a bracket 41 is provided on the side wall of the gantry 4, and the hook 5 is installed on the bracket 41. The hook 5 includes a fixed seat 51, a hook body 52, a first adjusting knob 53 and a second adjusting knob 54. The fixed seat 51 is detachably installed on the mounting hole of the bracket 41. The hook body 52 has an axially extending guide rod portion 521 and a hanging portion 522. The guide rod portion 521 is inserted into the guide groove of the fixed seat 51. The lower surface of the guide rod portion 521 is provided with equidistantly arranged serrated hanging teeth 5211. The tooth tip angle of the serrated hanging teeth 5211 is 40°~50°. The first adjusting knob 53 is connected to the guide rod portion 521 to adjust the extension length of the guide rod portion 521. The second adjusting knob 54 is used to adjust the placement angle of the hook body 52.

[0046] In this embodiment, the threaded section of the first adjusting knob 53 is threadedly connected to the threaded hole in the fixing seat 51, and the end of the first adjusting knob 53 is movably installed in the guide rod portion 521. When the first adjusting knob 53 is rotated clockwise, the end of the first adjusting knob 53 pushes the guide rod portion 521 to move outward. When the first adjusting knob 53 is rotated counterclockwise, the first adjusting knob 53 moves outward. At the same time, since a latching protrusion is installed at the end of the first adjusting knob 53, the latching protrusion is located in the installation cavity of the guide rod portion 521, and the guide rod portion 521 moves inward accordingly.

[0047] In this embodiment, the hook 5 and the bracket 41 are locked and fixed by the second adjusting knob 54. When the second adjusting knob 54 is rotated counterclockwise, the second adjusting knob 54 moves outward, and the hook 5 and the bracket 41 are separated. At this time, the hook 5 can rotate freely to a certain angle. After rotating to a suitable angle, the second adjusting knob 54 is rotated clockwise so that the second adjusting knob 54 locks the hook 5 on the bracket 41.

[0048] Specifically, a gantry 4 is fixedly installed on the top of the uppermost frame 11, and hooks 5 are arranged on both sides thereof for overlapping with the wall. This design greatly enhances the stability of the entire frame 11 structure. When used in construction, by firmly connecting the hooks 5 on both sides of the gantry 4 with the wall, additional support points can be provided for the frame 11, part of the force is dispersed to the wall, and the frame 11 is prevented from toppling due to uneven force, creating a safe working environment for construction workers.

[0049] See also Figure 5As shown, the lower surface of the guide rod portion 521 is provided with equidistantly arranged sawtooth-shaped hanging teeth 5211, and the tooth tip angle is 40°~50°. Such a design can significantly increase the friction and bite force between the hook 5 and the wall. When the hook 5 is hung on the wall, under a certain pressure, the sawtooth-shaped hanging teeth 5211 will be embedded in the tiny gaps or holes in the wall, and the tooth tip angle is 40°~50°, which can ensure that the sawtooth-shaped hanging teeth 5211 penetrate into the wall to form an effective grip, and will not be difficult to embed due to too large an angle, or the grip is insufficient due to too small an angle. It is worth mentioning that with such a design, on a rough cement wall, the sawtooth-shaped hanging teeth 5211 can fit with the concave-convex structure of the wall surface, greatly improving the firmness of the connection between the hook 5 and the wall, and making the frame 11 stable and reliable during use.

[0050] In one embodiment, the climbing frame mechanism 1 further includes a sliding column 12 and a connecting seat 13 , the sliding column 12 and the connecting seat 13 are connected, the frame body 11 at the bottom layer is sleeved on the sliding column 12 , and the connecting seat 13 and the support member 21 are connected.

[0051] Specifically, the side wall of the slide column 12 is provided with a plurality of linearly arranged sockets 121 , and the side wall of the frame 11 at the bottom is provided with a latch 14 , at least a portion of which is inserted into the socket 121 to achieve connection between the frame 11 and the slide column 12 .

[0052] In one embodiment, the bottom of the support seat 22 is provided with an anti-skid pad, the bottom surface of the anti-skid pad is provided with staggered triangular anti-skid patterns, and the anti-skid pad is connected to the threaded hole reserved at the bottom of the support seat 22 by bolts. In one embodiment, the frame 11 is made of aluminum alloy profiles or carbon steel profiles, the cross section of the frame 11 is a rectangular hollow structure, and the inner wall of the frame 11 is provided with longitudinal reinforcing ribs, and the thickness of the longitudinal reinforcing ribs is 1.2 to 1.5 times the wall thickness of the frame 11.

[0053] It should be noted that the indicated orientation or position relationship is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the application product is usually placed when used, or is the orientation or position relationship commonly understood by technical personnel in this field, or is the orientation or position relationship in which the application product is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application.

[0054] It should be understood that those skilled in the art can make improvements or changes based on the above description, and all these improvements and changes should fall within the scope of protection of the appended claims of the present invention.

[0055] The above is an exemplary description of the present invention in conjunction with the accompanying drawings. It is obvious that the implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made by adopting the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. An adjustable safety ladder for construction engineering, characterized in that: include: Climbing frame mechanism (1); A base (2), the base (2) comprising a support member (21) and two support seats (22) arranged opposite to each other, the climbing frame mechanism (1) being fixedly mounted on the support member (21), each of the support seats (22) being connected to the support member (21) via a movable rod (23), at least a portion of the movable rod (23) being nested in the support member (21), each of the movable rods (23) being capable of horizontal telescopic movement relative to the support member (21) to drive the support seat (22) connected thereto to move a predetermined distance in the horizontal direction, so that the two support seats (22) are in contact with the ground.

2. An adjustable safety ladder for construction engineering as claimed in claim 1, characterized in that: The climbing frame mechanism (1) comprises a plurality of frames (11) and locking assemblies (3) which are nested in sequence along the vertical direction. At least one of the frames (11) can be expanded or contracted along the vertical direction. The locking assemblies (3) are symmetrically arranged on both sides of each of the frames (11). In two adjacent frames (11), the locking assemblies (3) on the side walls of the frame (11) located at the lower layer lock the frame (11) located at the upper layer. The locking assemblies (3) have a locked state and an unlocked state. When the locking assemblies (3) on the side walls of the frame (11) located at the lower layer are in the unlocked state, the locking assemblies (3) are disengaged from the pin holes of the frame (11) located at the upper layer, so that the frame (11) located at the upper layer can be pulled to expand in the vertical direction. When the locking assemblies (3) on the side walls of the frame (11) located at the lower layer are in the locked state, the frame (11) located at the upper layer is fixed.

3. An adjustable safety ladder for construction engineering as claimed in claim 2, characterized in that: The locking assembly (3) comprises a toggle frame (31), a pin rod (32) and a spring (33); the toggle frame (31) is hinged to the side wall of the frame body (11) through a rotating shaft; one end of the toggle frame (31) is provided with a pressing portion (311), and the other end of the toggle frame (31) is provided with a transmission portion (312); the pin rod (32) is hinged to the transmission portion (312); in two adjacent frames (11), the pin rod (32) can pass through the mounting hole of the frame body (11) located at the lower layer in the horizontal direction and be inserted into the pin hole of the frame body (11) located at the upper layer; one end of the spring (33) is fixed to the side wall of the frame body (11), and the other end of the spring (33) is connected to the pressing portion (311) of the toggle frame (31); When the pressing portion (311) of the toggle frame (31) is pressed, the transmission portion (312) tilts up to drive the pin rod (32) to disengage from the pin hole, the spring (33) is compressed, and the locking assembly (3) is in an unlocked state; After the pressing is released, the spring (33) pushes the pressing portion (311) to return to its original position, and the pin rod (32) is inserted into the pin hole to complete the locking.

4. An adjustable safety ladder for construction engineering as claimed in claim 3, characterized in that: A gantry frame (4) is fixedly installed on the top of the frame body (11) at the top, and hooks (5) for overlapping with the wall are arranged on both sides of the gantry frame (4).

5. An adjustable safety ladder for construction engineering as claimed in claim 4, characterized in that: The side wall of the gantry (4) is provided with a bracket (41), the hook (5) is installed on the bracket (41), the hook (5) comprises a fixing seat (51), a hook body (52), a first adjusting knob (53) and a second adjusting knob (54), the fixing seat (51) is detachably installed on the mounting hole of the bracket (41), the hook body (52) comprises an axially extending guide rod portion (521) and a hanging portion (522), the guide rod portion (521) The guide rod portion (521) is inserted into the guide groove of the fixing seat (51), and the lower surface of the guide rod portion (521) is provided with equidistantly arranged sawtooth-shaped hooking teeth (5211), and the tooth tip angle of the sawtooth-shaped hooking teeth (5211) is 40°~50°. The first adjusting knob (53) is connected to the guide rod portion (521) to adjust the extension length of the guide rod portion (521), and the second adjusting knob (54) is used to adjust the placement angle of the hook body (52).

6. An adjustable safety ladder for construction engineering as claimed in claim 5, characterized in that: The spring (33) is a helical compression spring (33), and the pre-tightening force of the spring (33) causes the pin rod (32) to generate a locking force of not less than (50)N when the pin rod (32) is inserted into the pin hole.

7. The adjustable safety ladder for construction engineering as claimed in claim 2, characterized in that: The climbing frame mechanism (1) further comprises a sliding column (12) and a connecting seat (13), wherein the sliding column (12) and the connecting seat (13) are connected, the frame body (11) located at the bottom layer is sleeved on the sliding column (12), and the connecting seat (13) and the supporting member (21) are connected.

8. An adjustable safety ladder for construction engineering as claimed in claim 7, characterized in that: The side wall of the slide column (12) is provided with a plurality of insertion holes (121) arranged linearly in a straight line, and the side wall of the frame body (11) located at the bottom layer is provided with a latch (14), and at least a part of the latch (14) is inserted into the insertion hole (121) to achieve the connection between the frame body (11) and the slide column (12).

9. An adjustable safety ladder for construction engineering as claimed in claim 8, characterized in that: The bottom of the support seat (22) is provided with an anti-skid pad, the bottom surface of the anti-skid pad is provided with triangular anti-skid patterns that are staggered, and the anti-skid pad is connected to a threaded hole reserved at the bottom of the support seat (22) via a bolt.

10. An adjustable safety ladder for construction engineering as claimed in claim 9, characterized in that: The frame (11) is made of aluminum alloy profiles or carbon steel profiles, the cross-section of the frame (11) is a rectangular hollow structure, and the inner wall of the frame (11) is provided with longitudinal reinforcing ribs, the thickness of the longitudinal reinforcing ribs being 1.2 to 1.5 times the wall thickness of the frame (11).

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