A sliding creeper ladder and engineering machine
By using a sliding ladder design and a limiting mechanism, the problem of inflexible ladder height adjustment in construction machinery has been solved, enabling rapid adjustment and safe locking of ladder height, thus improving ease of use and stability.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- XCMG CONSTRUCTION MACHINERY CO LTD ROAD MACHINERY BRANCH
- Filing Date
- 2025-06-25
- Publication Date
- 2026-06-19
AI Technical Summary
In existing construction machinery, folding ladders cannot be flexibly adjusted in height, and the limit devices are cumbersome to operate, affecting ease of use and safety.
The sliding ladder design allows for rapid adjustment and locking of the ladder height through the sliding cooperation and limiting mechanism between the movable and fixed ladders, using guide components and linkage springs, thus simplifying the operation process.
It enables flexible adjustment of ladder height, improves versatility and safety, reduces equipment replacement costs, reduces wear and tear and maintenance complexity, and enhances ease of use and stability.
Smart Images
Figure CN224379751U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to a sliding ladder and engineering machinery, belonging to the field of engineering machinery technology. Background Technology
[0002] In construction machinery operations, the lifting and lowering movement of the machine's control platform necessitates frequent adjustments to the foot height of the ladders for getting on and off the machine to meet the safe access needs of operators. Currently, the industry commonly uses folding ladders, which, while having the advantage of simple structure, have the following problems in practical applications: (1) The operating position is limited, making it impossible to flexibly adjust to different platform heights or working positions. (2) The limiting device is inefficient, and the existing adjustment and limiting structures are cumbersome to operate, affecting ease of use and safety. Summary of the Invention
[0003] To address the problems existing in the prior art, this utility model provides a sliding ladder and engineering machinery that is safe, convenient, and highly reliable.
[0004] To achieve the above objectives, this utility model employs a sliding ladder, comprising:
[0005] A fixed ladder is provided with a set of first fixing holes;
[0006] The movable ladder slides up and down along the fixed ladder via a guide component. The movable ladder is provided with at least one set of second fixing holes, and each set of second fixing holes can be aligned and fitted with the first fixing hole, so that the movable ladder can be fixed at different height positions of the fixed ladder.
[0007] The limiting mechanism includes a connecting rod rotatably mounted on the fixed ladder. A tension spring is provided between the connecting rod and the fixed ladder. The tension spring is used to reset the rotating connecting rod. The connecting rod is connected to a pin, which is installed in a first fixing hole and its end can be inserted into a second fixing hole. When the connecting rod is rotated, the end of the pin can be disengaged from a set of second fixing holes. When the connecting rod is reset under the action of the tension spring, the end of the pin is inserted into another set of second fixing holes, thereby locking and adjusting the position of the movable ladder.
[0008] As an improvement, the guide assembly includes pins disposed on both sides of the fixed ladder and long slides disposed on both sides of the movable ladder.
[0009] The long slide groove and the pin form a sliding fit, and the sliding guide between the pin and the long slide groove enables the movable ladder to slide on the fixed ladder.
[0010] As an improvement, L-shaped plates are welded to both sides of the movable ladder, and long sliding grooves are formed on the L-shaped plates along the length of the movable ladder.
[0011] As an improvement, a washer and nut are installed at the end of the pin that passes through the long groove.
[0012] As an improvement, both sides of the fixed ladder are provided with perforated plates and ear plates; the connecting rod includes a rod body, the two ends of the rod body are respectively rotatably connected to the perforated plates, and the two ends of the rod body are fixed with upper rods for axial limiting of the rod body, the upper rods and the rod body forming an inverted T-shaped structure;
[0013] The upper part of the upper rod is connected to the tension spring, the other end of the tension spring is connected to the ear plate, and the middle part of the upper rod is connected to the pin.
[0014] As an improvement, the pin includes a housing fixed in the first fixing hole, a movable pin installed in the housing, and a spring;
[0015] One end of the movable pin is connected to the connecting rod, and the other end is inserted into the second fixing hole. The spring is fitted on the outer ring of the movable pin and limited between the movable pin and the outer shell. The movable pin slides along the axial direction of the outer shell under the drive of the connecting rod, and the spring is used to reset the movable pin.
[0016] As an improvement, the outer shell is a cylindrical structure with openings at both ends.
[0017] As an improvement, the movable pin is coaxially mounted inside the housing, and the housing and the movable pin are provided with a boss for limiting the spring.
[0018] As an improvement, an L-shaped rod is installed at one end of the connecting rod. The L-shaped rod includes a first arm and a second arm that are perpendicular to each other. A handle is installed on the first arm, and a pull rod is installed on the second arm.
[0019] In a second aspect, this utility model also provides an engineering machine on which the aforementioned sliding ladder is installed.
[0020] Compared with the prior art, the beneficial effects of this utility model are:
[0021] (1) The movable ladder can slide up and down along the fixed ladder, and can be fixed at different heights by aligning multiple sets of second fixing holes with the first fixing hole. Compared with traditional fixed-height ladders, this utility model can quickly adjust the ladder height according to the actual use scenario, which significantly improves the versatility and applicability of the ladder and reduces the cost of repeatedly replacing equipment due to height mismatch.
[0022] (2) When the movable ladder is adjusted to the target height, the connecting rod automatically resets under the action of the tension spring, which drives the pin to accurately insert into the second fixing hole, forming a mechanical lock, which is convenient to operate.
[0023] (3) The guide assembly has a simple structure and high reliability, which reduces the wear of moving parts. Attached Figure Description
[0024] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0025] Figure 1 This is a schematic diagram of the structure of this utility model;
[0026] Figure 2 This is a schematic diagram of the disassembly structure of this utility model;
[0027] Figure 3 This is a schematic diagram of the installation of the limiting mechanism of this utility model;
[0028] Figure 4 This is a partially enlarged schematic diagram of the limiting mechanism of this utility model;
[0029] Figure 5 This is a side view of the limiting mechanism of this utility model;
[0030] Figure 6 This is an exploded view of the limiting mechanism of this utility model;
[0031] Figure 7 This is a schematic diagram of the internal structure of the pin of this utility model;
[0032] Figure 8 This is a schematic diagram illustrating the limiting position of this utility model;
[0033] In the diagram: 1. Fixed ladder, 11. Pin, 12. Hole plate, 13. Ear plate, 14. First fixing hole, 2. Movable ladder, 21. Long slide, 22. Second fixing hole, 3. Limiting mechanism, 31. Pull rod, 32. Connecting rod, 321. Rod body, 322. Upper rod, 323. L-shaped rod, 33. Tension spring, 34. Pin, 341. Movable pin, 342. Spring, 343. Housing, 35. Handle, 36. Fixing pin, 37. Connecting pin, 4. Washer, 5. Nut. Detailed Implementation
[0034] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this application will be described in detail below through specific embodiments. It should be understood that the embodiments of this application and the specific features in the embodiments are detailed descriptions of the technical solutions of this application, rather than limitations on the technical solutions of this application. In the absence of conflict, the embodiments of this application and the technical features in the embodiments can be combined with each other.
[0035] In the description of this utility model, it should be understood that the terms "lateral" and other indications of orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the protection content of this utility model.
[0036] like Figures 1-8 As shown, a sliding ladder includes a fixed ladder 1, a movable ladder 2 slidably mounted on the fixed ladder 1, and a limiting mechanism 3 for limiting and fixing the movable ladder 2 and the fixed ladder 1.
[0037] The fixed ladder 1 is provided with a set of first fixing holes 14;
[0038] The movable ladder 2 slides up and down along the fixed ladder 1 via a guide assembly. The movable ladder 2 is provided with at least one set of second fixing holes 22, which are arranged in rows on the movable ladder 2. Each set of second fixing holes 22 can be aligned and engaged with the first fixing hole 14, so that the movable ladder 2 can be fixed at different height positions on the fixed ladder 1. Through the sliding guiding effect of the guide assembly, the shaking and jamming during the sliding process are reduced, and the misalignment of the fixing holes caused by offset is avoided, further improving stability. The movable ladder 2 can slide freely along the fixed ladder 1, and can be fixed at multiple height positions through the alignment and engagement of the second fixing holes 22 with the first fixing holes 14.
[0039] The limiting mechanism 3 includes a connecting rod 32 rotatably mounted on the fixed ladder 1. A tension spring 33 is provided between the connecting rod 32 and the fixed ladder 1. The tension spring 33 is used for the rotational reset of the connecting rod 32. The connecting rod 32 is connected to a pin 34. The pin 34 is installed in the first fixing hole 14, and its end can be inserted into the second fixing hole 22. When the connecting rod 32 is rotated, the end of the pin 34 can be disengaged from a set of second fixing holes 22. When the connecting rod 32 is reset under the action of the tension spring 33, the end of the pin 34 is inserted into another set of second fixing holes 22, thereby locking and adjusting the position of the movable ladder 2. The limiting mechanism 3 of this utility model is linked to the tension spring 33 via the connecting rod 32. Rotating the connecting rod 32 unlocks the pin 34, and the tension spring 33 automatically resets and locks after being released. The operation requires no tools. For example, the operator can hold the ladder steady with one hand and adjust the connecting rod 32 with the other, which meets the needs of convenient operation. At the same time, the elastic reset design of the tension spring 33 reduces the wear of mechanical parts. Compared with the manual bolt locking structure, it can reduce the wear of parts caused by frequent adjustment and extend the service life of the ladder. During use, the pin 34 passes through the first fixing hole 14 and the second fixing hole 22 at the same time to form a rigid connection. Compared with a single locking point, it can better resist lateral forces and vibrations, and also avoids the risk of fatigue fracture that may occur with flexible connections, making it suitable for long-term repeated use.
[0040] In some embodiments, such as Figure 1 , Figure 2 As shown, the guide assembly includes multiple pins 11 disposed on both sides of the fixed ladder 1 and long slide grooves 21 disposed on both sides of the movable ladder 2. Both the pins 11 and the long slide grooves 21 are basic mechanical parts, which are easy to process and have low manufacturing costs. No additional connecting parts (such as guide rails or sliders) are required. Installation is completed directly by inserting the pins 11 into the long slide grooves 21, reducing assembly steps. The long slide grooves 21 and the pins 11 form a sliding fit. Through the sliding guidance of the pins 11 and the long slide grooves 21, the movable ladder 2 slides on the fixed ladder 1. In addition, the pins 11 on both sides of the fixed ladder 1 and the long slide grooves 21 on both sides of the movable ladder 2 form a symmetrical guide structure, which restricts the left and right swaying of the movable ladder 2 during the sliding process.
[0041] In some embodiments, such as Figure 2 As shown, L-shaped plates are welded to both sides of the movable ladder 2. Long slide grooves 21, arranged along the length of the movable ladder 2, are formed on the L-shaped plates. The length of the long slide grooves 21 essentially covers the entire travel range of the movable ladder 2, allowing the movable ladder 2 to adjust its height continuously on the fixed ladder 1. The straight design of the long slide grooves 21 provides a smooth sliding trajectory. The gap between the pin 11 and the inner wall of the slide groove can be controlled by tolerances to avoid jamming caused by burrs or deformation.
[0042] In some embodiments, such as Figure 1 , Figure 2 As shown, a washer 4 and a nut 5 are installed at the end of the pin 11 that passes through the long slide groove 21. The nut 5 and the threaded engagement of the pin 11 support repeated disassembly and assembly, which is convenient for on-site maintenance or replacement of parts. After the pin 11 passes through the long slide groove 21, the nut 5 is installed at the end of the pin 11. Even if the pin 11 is slightly deformed, the nut 5 can prevent it from falling out of the slide groove.
[0043] In some embodiments, such as Figure 4 As shown, the fixed ladder 1 has perforated plates 12 and ear plates 13 on both sides; the connecting rod 32 includes a rod body 321, the two ends of the rod body 321 are respectively rotatably connected to the perforated plate 12, and the two ends of the rod body 321 are fixed with upper rods 322 for axially limiting the rod body 321. The upper rods 322 and the rod body 321 form an inverted T-shaped structure, and the upper rods 322 prevent the connecting rod 32 from axially disengaging from the perforated plate 12 during rotation;
[0044] The upper part of the upper rod 322 is connected to the tension spring 33, and the other end of the tension spring 33 is connected to the ear plate 13. The middle part of the upper rod 322 is connected to the pin 34 through the connecting pin 37. When the connecting rod 32 rotates, the tension spring 33 is stretched and stores energy. After being released, the elastic potential energy drives the connecting rod 32 to reset (at the same time, the height of the movable ladder 2 needs to be manually adjusted so that the end of the pin 34 is inserted into the second fixing hole 22 at the corresponding position).
[0045] In some embodiments, such as Figure 7 As shown, the pin 34 includes a housing 343 fixed in the first fixing hole 14, a movable pin 341 installed in the housing 343, and a spring 342;
[0046] One end of the movable pin 341 is connected to the connecting rod 32, and the other end is inserted into the second fixing hole 22. The spring 342 is fitted on the outer ring of the movable pin 341 and is limited between the movable pin 341 and the outer shell 343. The movable pin 341 slides along the axial direction of the outer shell 343 under the action of the connecting rod 32. The spring 342 is used to reset the movable pin 341. The spring 342 is fitted on the outside of the movable pin 341. When the connecting rod 32 drives the movable pin 341 to disengage from the second fixing hole 22, the spring 342 is compressed. After the connecting rod 32 is released, the reset force of the spring 342 pushes the movable pin 341 to automatically insert into the new second fixing hole 22. There is no need to manually align the pin, simplifying the operation process and improving the adjustment efficiency. Even if the operator temporarily releases the connecting rod 32, the automatic reset characteristic of the spring 342 can ensure that the movable pin 341 is quickly locked, preventing the ladder from sliding due to accidental loosening during the adjustment process and enhancing the safety of use. In addition, this invention provides a dual reset guarantee through spring reset and tension spring 33. Even if one component fails, the other component can still provide a partial locking function, thereby improving the system's fault tolerance.
[0047] In some embodiments, such as Figure 7 As shown, the outer casing 343 is a cylindrical structure open at both ends. The outer casing 343 is fixed within the first fixing hole 14, providing a rigid guide channel for the axial sliding of the movable pin 341. This prevents the movable pin 341 from shifting or jamming during movement, ensuring the alignment accuracy between the pin 34 and the fixing hole, and improving locking reliability. The outer casing 343, movable pin 341, and spring 342 can be installed or replaced as independent modules. When a component is damaged, it is not necessary to disassemble the entire ladder structure, reducing maintenance complexity.
[0048] In some embodiments, such as Figure 7As shown, the movable pin 341 is coaxially mounted inside the housing 343. The housing 343 and the movable pin 341 are provided with bosses for limiting the spring 342. The housing bosses restrict the spring 342 from dislodging outwards, and the movable pin bosses restrict the spring from moving inwards. Especially when the ladder frequently slides or is subjected to impact and vibration (such as swaying caused by personnel climbing during operation), this prevents the spring 342 from sliding out of the housing 343, which has openings at both ends, and prevents the movable pin 341 from failing due to the spring falling off. This invention uses the bosses on the housing 343 and the movable pin 341 as support surfaces at both ends of the spring 342, respectively, to limit the spring 342 to a coaxial position, preventing the spring from tilting or twisting due to installation errors or vibrations. Furthermore, the height of the bosses (i.e., the limiting distance) determines the initial compression and maximum stroke of the spring 342, preventing the spring 342 from being over-compressed or relaxed.
[0049] In some embodiments, such as Figures 4-6 As shown, an L-shaped rod 323 is installed at one end of the connecting rod 32. The L-shaped rod 323 includes a first arm and a second arm that are perpendicular to each other. A handle 35 is installed on the first arm, and a pull rod 31 is installed on the second arm via a fixing pin 36. The pull rod 31 extends along the length (vertical direction) of the movable ladder 2. When the ladder is raised to a high position, the operator above can control the rotation of the connecting rod 32 by pulling the pull rod 31. The handle 35 is arranged horizontally and located below the pull rod 31. When the ladder is at a low position or on the ground, the operator can stand on the side of the ladder and control the connecting rod 32 by pulling the handle 35 horizontally. The operator at height can unlock the ladder by pulling the pull rod 31, and the ground personnel can unlock it in an emergency by using the handle 35, forming a double safety mechanism.
[0050] Finally, this utility model also provides an engineering machine, on which the aforementioned sliding ladder is installed.
[0051] The sliding ladder of this utility model is used as follows:
[0052] (1) The fixed ladder 1 is fixed at the required position of the engineering machinery, and the movable ladder 2 slides on the fixed ladder 1 through the sliding cooperation of the pin 11 and the long slide groove 21; at this time, the movable pin 341 of the pin 34 is inserted into the first fixed hole 14 of the fixed ladder 1 and a certain set of second fixed holes 22 of the movable ladder 2 under the action of the tension spring 33 and the spring 342, locking the height of the movable ladder 2;
[0053] (2) Adjust the height (slide upwards)
[0054] Low-position operation (ground or low height): The operator stands on the side of the ladder and pulls the handle 35 horizontally, which drives the connecting rod 32 to rotate, so that the movable pin 341 disengages from the current second fixing hole 22;
[0055] High-level operation (requires raising the ladder): When the ladder is raised to a certain height, the operator above pulls the lever 31 vertically, which also drives the connecting rod 32 to rotate, causing the movable pin 341 to disengage from the current hole position;
[0056] Sliding and positioning: After the movable pin 341 is disengaged, the movable ladder 2 is pushed to slide upward along the pin 11 in the long slide groove 21. When the desired height is reached, the handle 35 or the pull rod 31 is released. At this time, the tension spring 33 drives the connecting rod 32 to reset. The movable pin 341 is inserted into the new second fixing hole 22 under the action of the spring 342, and the height is locked.
[0057] Adjust the height (slide it down).
[0058] The operating logic is similar to that of upward sliding: by pulling handle 35 or lever 31, the pin 34 is disengaged from the hole, and the movable ladder 2 slides downward under gravity or manual pushing. Once it reaches the target position, it is released, and the pin automatically resets and locks. The tension spring 33 and spring 342 in the limiting mechanism 3 ensure that the pin 34 remains locked when no external force is applied, preventing accidental sliding of the movable ladder. After each height adjustment, it must be confirmed that the pin 34 is fully inserted into the fixed hole to ensure the stability of the ladder.
[0059] Furthermore, those skilled in the art will understand that although some embodiments described herein include certain features found in other embodiments but not others, combinations of features from different embodiments are also within the scope of protection of this utility model and form different embodiments. For example, in the embodiments described above, those skilled in the art can use them in combination based on known technical solutions and the technical problems to be solved by this application.
Claims
1. A sliding step ladder characterized by, include: A fixed ladder (1) is provided with a set of first fixing holes (14); The movable ladder (2) slides up and down along the fixed ladder (1) via a guide component. The movable ladder (2) is provided with at least one set of second fixing holes (22). Each set of second fixing holes (22) can be aligned and fitted with the first fixing hole (14), so that the movable ladder (2) can be fixed at different height positions of the fixed ladder (1). The limiting mechanism (3) includes a connecting rod (32) rotatably mounted on the fixed ladder (1). A tension spring (33) is provided between the connecting rod (32) and the fixed ladder (1). The tension spring (33) is used for the rotation reset of the connecting rod (32). The connecting rod (32) is connected to a pin (34). The pin (34) is installed in the first fixing hole (14), and its end can be inserted into the second fixing hole (22). When the connecting rod (32) is rotated, the end of the pin (34) can be disengaged from a set of second fixing holes (22). When the connecting rod (32) is reset under the action of the tension spring (33), the end of the pin (34) is inserted into another set of second fixing holes (22), thereby realizing the locking and adjustment of the position of the movable ladder (2).
2. A sliding step ladder according to claim 1, wherein, The guide assembly includes pins (11) disposed on both sides of the fixed ladder (1) and long slides (21) disposed on both sides of the movable ladder (2); The long slide groove (21) and the pin (11) form a sliding fit. Through the sliding guidance of the pin (11) and the long slide groove (21), the movable ladder (2) slides on the fixed ladder (1).
3. A sliding step ladder according to claim 2, wherein, The movable ladder (2) has L-shaped plates welded to both sides, and the L-shaped plates have long slide grooves (21) arranged along the length of the movable ladder (2).
4. A sliding step ladder according to claim 2 wherein, The end of the pin (11) that passes through the long groove (21) is fitted with a washer (4) and a nut (5).
5. The sliding step ladder of claim 1 wherein, The fixed ladder (1) is provided with perforated plates (12) and ear plates (13) on both sides; the connecting rod (32) includes a rod body (321), the two ends of the rod body (321) are rotatably connected to the perforated plates (12) respectively, and the two ends of the rod body (321) are fixed with upper rods (322) for axial limiting of the rod body (321), and the upper rods (322) and the rod body (321) form an inverted T-shaped structure; The upper part of the upper rod (322) is connected to the tension spring (33), the other end of the tension spring (33) is connected to the ear plate (13), and the middle part of the upper rod (322) is connected to the pin (34).
6. The sliding step ladder of claim 1, wherein, The pin (34) includes a housing (343) fixed in the first fixing hole (14), a movable pin (341) installed in the housing (343), and a spring (342); One end of the movable pin (341) is connected to the connecting rod (32), and the other end is inserted into the second fixing hole (22). The spring (342) is fitted on the outer ring of the movable pin (341) and limited between the movable pin (341) and the outer shell (343). The movable pin (341) slides along the axial direction of the outer shell (343) under the drive of the connecting rod (32). The spring (342) is used to reset the movable pin (341).
7. A sliding step ladder according to claim 6 wherein, The outer shell (343) is a cylindrical structure with openings at both ends.
8. A sliding step ladder according to claim 6 or 7, wherein, The movable pin (341) is coaxially mounted inside the housing (343), and the housing (343) and the movable pin (341) are provided with bosses for limiting the spring (342).
9. The sliding step ladder of claim 1, wherein, One end of the connecting rod (32) is equipped with an L-shaped rod (323), which includes a first rod arm and a second rod arm that are perpendicular to each other. A handle (35) is installed on the first rod arm, and a pull rod (31) is installed on the second rod arm.
10. An engineering machinery, characterized in that, The engineering machinery is equipped with a sliding ladder as described in any one of claims 1-9.