Flexible step ladder for an engineering machine

Abstract

The utility model discloses a flexible step ladder for engineering machinery, including fixed ladder section and movable ladder section, fixed ladder section is connected in the frame, and both relative statics between, movable ladder section rotatory connection below fixed ladder section, and the movable ladder section can swing along the before and after direction of vehicle advancement, in the process of vehicle advancement, when the movable ladder section is collided in the before and after direction, the transverse portion and longitudinal portion between in movable ladder section form the parallelogram structure of deformability, the longitudinal portion in movable ladder section is equipped with the flexible section, one side flexible section plays the buffering effect when being collided in the before and after direction, the other side flexible section can take place the elastic deformation when movable ladder section is collided towards the car body. The utility model can realize that the movable ladder section of near ground part is flexibly deformed when the step ladder is collided by foreign matter in the process of vehicle operation, and the step ladder is not damaged by collision to the greatest extent.

Description

Technical Field

[0001] This utility model relates to a flexible treadmill ladder for engineering machinery, belonging to the field of engineering machinery technology. Background Technology

[0002] For large construction machinery, such as heavy loaders and wheeled bulldozers, the loading ramps are usually located on the side of the rear of the vehicle. Because large construction machinery has large blind spots, uneven working surfaces, and strict standards for the ground clearance of the lowest step of the loading ramp, these ramps are prone to colliding with foreign objects during operation. Commonly, the bottom steps of these ramps are connected only by flexible components. Since the allowable deformation of these flexible components is limited, collisions can easily exceed their elastic deformation range, leading to damage to the loading ramp. Summary of the Invention

[0003] The purpose of this invention is to provide a flexible trolley ladder for engineering machinery, which solves the problem in the background art that the trolley ladder is easily damaged when it is hit during the operation of large engineering machinery.

[0004] To achieve the above objectives, this utility model provides the following technical solution: This utility model provides a flexible treadmill ladder for engineering machinery, comprising: A fixed ladder section is connected to the frame, and the two are relatively stationary. The movable ladder section is rotatably connected below the fixed ladder section, and the movable ladder section can swing along the forward and backward direction of vehicle movement; when the movable ladder section is subjected to a forward and backward collision during vehicle movement, a deformable parallelogram structure is formed between the transverse and longitudinal parts of the movable ladder section; the longitudinal part of the movable ladder section is provided with a flexible section, which plays a buffering role when subjected to a forward and backward collision, and can elastically deform when the movable ladder section is subjected to a collision towards the vehicle body.

[0005] In some embodiments, the fixed stair section includes: A pair of opposing uprights, the bottom of which is fixed with a first rotating frame for hinged connection of the movable ladder section; At least one footplate is fixed between the two uprights.

[0006] In some embodiments, when at least two pedals are provided vertically between the two uprights, the pedals that face upwards are closer to the frame.

[0007] In some embodiments, the upright plate is a bent plate, and the upright plate has a plurality of mounting holes spaced from top to bottom on the part facing the frame, and is detachably connected to the frame by fasteners; the width of the upright plate gradually increases from top to bottom on the part perpendicular to the frame, and the end of the pedal in the length direction is fixed to the part of the upright plate perpendicular to the frame.

[0008] In some embodiments, when the movable stair section is a frame, the transverse portion of the frame is a tread, and a third rotating frame is fixed at each end of the tread along its length; the longitudinal portion of the frame consists of two opposing upright plate assemblies, each upright plate assembly including a connector and rotating components fixed to the upper and lower parts of the connector; the top of the upper rotating component is inserted into the first rotating frame in the fixed stair section, and the hinge holes of the two are aligned before being inserted into the hinge; the bottom of the lower rotating component is inserted into the third rotating frame, and the hinge holes of the two are aligned before being inserted into the hinge.

[0009] In some embodiments, the connector is a flexible connector, which constitutes the flexible segment; the connector has a pressure plate on the other side that contacts the rotating component, and fasteners pass through the three components to fix them together.

[0010] In some embodiments, when the movable ladder section consists of two frame sections, the transverse portion of frame section I is a tread I, and a second rotating frame is fixed at each end of the length direction of tread I; the transverse portion of frame section II is a tread II, and a third rotating frame is fixed at each end of the length direction of tread II; the longitudinal portion of frame section I consists of two oppositely arranged upright plate assemblies I, each upright plate assembly I including a connector I and rotating components I fixed to the upper and lower parts of the connector I; the top of the upper rotating component I is inserted into the first rotating frame in the fixed ladder section, and the two... After the hinge holes are aligned, the hinge is inserted into the hinge member; the bottom of the lower rotating component I is inserted into the upper part of the second rotating frame, and after the hinge holes of both are aligned, the hinge is inserted into the hinge member; the longitudinal part of the frame II consists of two opposing upright plate assemblies II, each upright plate assembly II including a connector II and rotating components II fixed to the upper and lower parts of the connector II; the top of the upper rotating component II is inserted into the lower part of the second rotating frame, and after the hinge holes of both are aligned, the hinge is inserted into the hinge member; the bottom of the lower rotating component II is inserted into the third rotating frame, and after the hinge holes of both are aligned, the hinge is inserted into the hinge member.

[0011] In some embodiments, both connector I and connector II are flexible connectors, the flexible connectors constitute the flexible segment, and connector II is longer than connector I; connector I has a pressure plate on the other side that contacts the rotating component I, and fasteners pass through all three to fix them together; connector II has a pressure plate on the other side that contacts the rotating component II, and fasteners pass through all three to fix them together.

[0012] In some embodiments, the treads in the fixed and movable stair sections are provided with anti-slip strips of the same length as the long side of the treads along the edge away from the vehicle body.

[0013] In some embodiments, threaded holes are provided at both ends of the top surface of the pedal along its length, and through holes arranged coaxially with the threaded holes are provided at both ends of the anti-slip strip along its length, so that the pedal and the anti-slip strip can be detachably connected by fasteners.

[0014] Compared with the prior art, the beneficial effects of this utility model are as follows: This utility model provides a flexible treadmill step for construction machinery. The fixed top step is installed on the side of the vehicle frame, protected by the vehicle body and less susceptible to collisions during operation. The upper step of the fixed step is closer to the frame than the lower step, providing good comfort and facilitating operator access. Both steps of the movable bottom step can swing significantly in the forward and backward direction of vehicle movement. The flexible component connecting the bottom step is longer than the component connecting the upper step, ensuring elastic deformation of the treadmill step in the event of a lateral impact, minimizing damage under various working conditions. Each step edge is equipped with alternating yellow and black anti-slip strips to prevent slipping and facilitate operator identification of step positions, improving safety during use. Attached Figure Description

[0015] The accompanying drawings, as part of this utility model, are used to provide a further understanding of the present utility model. The illustrative embodiments and descriptions of the present utility model are used to explain the present utility model, but do not constitute an undue limitation of the present utility model. Obviously, the drawings described below are merely some embodiments; those skilled in the art can obtain other drawings based on these drawings without any creative effort.

[0016] In the attached diagram: Figure 1 This is an assembly drawing of a flexible treadmill ladder for engineering machinery according to the present invention; Figure 2 This is a schematic diagram of the fixed ladder section of this utility model; Figure 3 This is a schematic diagram of the movable ladder section of this utility model.

[0017] Attached diagram labels: 1—Fixed stair section; 2—Modible stair section; 3—Anti-slip strip; 101—Left upright plate; 102—Right upright plate; 103—First step; 104—Second step; 105—First rotating frame; 201—Third step; 202—Fourth step; 203—First connecting piece; 204—Second connecting piece; 205—Rotating component; 206—Pressure plate; 207—Second rotating frame; 208—Third rotating frame.

[0018] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the present invention in any way, but rather to illustrate the concept of the present invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate this utility model, but are not intended to limit the scope of this utility model.

[0020] In the description of this utility model, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They 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. Therefore, they should not be construed as limitations on this utility model.

[0021] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] like Figure 1 As shown, a flexible step ladder for engineering machinery includes a fixed step 1 and a movable step 2. The fixed step 1 is connected to the vehicle frame, and the two are relatively stationary. The movable step 2 is rotatably connected below the fixed step 1, and the movable step 2 can swing along the forward and backward direction of the vehicle. During the vehicle's movement, when the movable step 2 is subjected to a forward and backward collision, a deformable parallelogram structure is formed between the transverse and longitudinal parts of the movable step 2. The longitudinal part of the movable step 2 is provided with a flexible section, which serves as a buffer when subjected to a forward and backward collision, and can also undergo elastic deformation when the movable step 2 is subjected to a collision towards the vehicle body (i.e., a side collision).

[0023] The following provides a further explanation of the specific structure of the aforementioned fixed stair section.

[0024] like Figure 2 As shown, the fixed stair section 1 includes a left upright plate 101, a right upright plate 102 and at least one tread arranged opposite to each other. The tread is fixed between the left upright plate 101 and the right upright plate 102. The bottom of the left upright plate 101 and the right upright plate 102 are fixed with a first rotating frame 105 for hinged connection of the movable stair section 2.

[0025] The preferred solution will continue to be referenced. Figure 2As shown, a first pedal 103 and a second pedal 104 are provided vertically between the left upright plate 101 and the right upright plate 102. The first pedal 103 is closer to the frame than the second pedal 104, which conforms to ergonomics and improves climbing comfort.

[0026] Further plans will continue to be considered. Figure 2 As shown, both the left upright plate 101 and the right upright plate 102 are bent plates. The left upright plate 101 and the right upright plate 102 have multiple mounting holes spaced from top to bottom on the part facing the frame, and are detachably connected to the frame by fasteners (bolts can be used). The width of the left upright plate 101 and the right upright plate 102 gradually increases from top to bottom on the part perpendicular to the frame (this is for the above-mentioned installation method, that is, the first pedal 103 is closer to the frame than the second pedal 104). The ends of the first pedal 103 and the second pedal 104 in the length direction are fixed to the left upright plate 101 and the right upright plate 102 on the part perpendicular to the frame.

[0027] The following provides a further explanation of the specific structure of the aforementioned active ladder sections.

[0028] like Figure 3 As shown, when the movable stair section 2 consists of two purlin frames, the transverse part of purlin frame I is the third step 201, and a second rotating frame 207 is fixed at each end of the length direction of the third step 201; the transverse part of purlin frame II is the fourth step 202, and a third rotating frame 208 is fixed at each end of the length direction of the fourth step 202; the longitudinal part of purlin frame I consists of two oppositely arranged upright plate assemblies I, and the upright plate assembly I includes a first connecting member 203 and rotating parts 205 fixed at the upper and lower parts of the first connecting member.

[0029] like Figure 3 As shown, the top of the upper rotating component 205 in the first connecting member 203 is inserted into the first rotating frame 105 in the fixed ladder section 1. After the hinge holes of the two are aligned, the hinge is inserted (bolts, nuts or other pin-like components can be used for rotatable connection); the bottom of the lower rotating component 205 in the first connecting member 203 is inserted into the upper part of the second rotating frame 207. After the hinge holes of the two are aligned, the hinge is inserted (bolts, nuts or other pin-like components can be used for rotatable connection).

[0030] like Figure 3As shown, the longitudinal part of the frame II consists of two opposing upright plate assemblies II. The upright plate assembly II includes a second connector 204 and rotating parts 205 fixed to the upper and lower parts of the second connector 204. The top of the upper rotating part 205 in the second connector 204 is inserted into the lower part of the second rotating frame 207. After the hinge holes of the two are aligned, a hinge is inserted (which can be connected by bolts, nuts, or other pin-like parts). The bottom of the lower rotating part 205 in the second connector 204 is inserted into the third rotating frame 208. After the hinge holes of the two are aligned, a hinge is inserted (which can be connected by bolts, nuts, or other pin-like parts).

[0031] Further options, such as Figure 3 As shown, both the first connector 203 and the second connector 204 are flexible connectors, forming a flexible segment. The second connector 204 is longer than the first connector 203, and the fourth pedal 202 is allowed to have obvious elastic deformation along the side of the vehicle body.

[0032] The first connector 203 has a pressure plate 206 on the other side that contacts the rotating component 205. Fasteners (such as bolts or nuts) pass through the three components and fix them together. The second connector 204 has a pressure plate 206 on the other side that contacts the rotating component 205. Fasteners (such as bolts or nuts) pass through the three components and fix them together.

[0033] As shown above, the movable step is rotatably connected below the fixed step and includes a pedal, a flexible connector, and a rotating component. The movable step can swing significantly in the forward and backward direction of vehicle movement. Furthermore, the flexible connector of the lower pedal is longer than that of the upper pedal, allowing the lower pedal to swing laterally across the vehicle body. This invention enables the movable step near the ground to swing and deform flexibly when the vehicle step is struck by a foreign object during vehicle operation, maximizing protection against collision damage to the vehicle step.

[0034] It should be noted that the above provides a preferred embodiment where the movable stair section consists of two frame frames. Of course, in actual design, depending on the size of the vehicle, the movable stair section can also be designed to consist of a single frame frame. The specific solution is as follows: When the movable stair section is a frame, the transverse part of the frame is a tread, and a third rotating frame is fixed at each end of the tread length direction; the longitudinal part of the frame consists of two opposing upright plate assemblies, each upright plate assembly including a connector and rotating parts fixed to the upper and lower parts of the connector; the top of the upper rotating part is inserted into the first rotating frame in the fixed stair section, and after the hinge holes of the two are aligned, a hinge member is inserted (which can be rotatably connected by bolts, nuts, or other pin-like parts); the bottom of the lower rotating part is inserted into the third rotating frame, and after the hinge holes of the two are aligned, a hinge member is inserted (which can be rotatably connected by bolts, nuts, or other pin-like parts).

[0035] In a further embodiment, the connector is a flexible connector, which forms a flexible segment; the connector has a pressure plate on the other side that contacts the rotating component, and fasteners (such as bolts or nuts) pass through the three components to fix them together.

[0036] The following provides further explanation of the treads in the fixed and movable stair sections mentioned above.

[0037] like Figure 1 As shown, the edges of the first pedal 103, the second pedal 104, the third pedal 201 and the fourth pedal 202 are all provided with yellow and black anti-slip strips 3 to prevent slipping when stepping on them, and at the same time make it easier for operators to identify the position of the pedals, thus improving the safety of using the treadmill ladder.

[0038] Further options, such as Figure 1 As shown, threaded holes are provided at both ends of the top surface of the first pedal 103, the second pedal 104, the third pedal 201 and the fourth pedal 202 along the length direction. Through holes arranged coaxially with the threaded holes are provided at both ends of the anti-slip strip 3 along the length direction. The pedal and the anti-slip strip 3 are detachably connected by fasteners (bolts can be used).

[0039] In summary, this utility model provides a flexible treadmill ladder for engineering machinery, achieving the following functions and effects: A flexible treadmill step for construction machinery includes a fixed step and a movable step. The fixed step is connected to the vehicle frame and includes two treads, with the upper tread closer to the frame than the lower tread, conforming to ergonomics and improving operator comfort. The movable step is rotatably connected below the fixed step and includes treads, flexible connectors, and rotating parts. The movable step can swing significantly in the forward and backward direction of the vehicle, and the flexible connector of the lower tread is longer than that of the upper tread, allowing the lower tread to swing laterally across the vehicle. This invention enables the movable step near the ground to swing and deform flexibly when the treadmill step is impacted by foreign objects during vehicle operation, maximizing protection against collision damage. Each tread edge is equipped with alternating yellow and black anti-slip strips to prevent slipping and facilitate operator identification of tread positions, improving the safety of the treadmill step.

[0040] Numerous specific details are set forth in the specification provided herein. However, it will be understood that embodiments of the present invention may be practiced without these specific details. In some instances, well-known methods, structures, and techniques have not been shown in detail so as not to obscure the understanding of this specification.

[0041] 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 invention 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.

[0042] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A flexible treadmill ladder for engineering machinery, characterized in that, include: A fixed ladder section is connected to the frame, and the two are relatively stationary. The movable ladder section is rotatably connected below the fixed ladder section, and the movable ladder section can swing along the forward and backward direction of vehicle movement; when the movable ladder section is subjected to a forward and backward collision during vehicle movement, a deformable parallelogram structure is formed between the transverse and longitudinal parts of the movable ladder section; the longitudinal part of the movable ladder section is provided with a flexible section, which plays a buffering role when subjected to a forward and backward collision, and can elastically deform when the movable ladder section is subjected to a collision towards the vehicle body.

2. The flexible treadmill ladder for engineering machinery according to claim 1, characterized in that, The fixed stair section includes: A pair of opposing uprights, the bottom of which is fixed with a first rotating frame for hinged connection of the movable ladder section; At least one footplate is fixed between the two uprights.

3. A flexible treadmill ladder for engineering machinery according to claim 2, characterized in that: When at least two pedals are provided at vertical intervals between the two uprights, the pedals that are higher up are closer to the frame.

4. A flexible treadmill ladder for engineering machinery according to claim 2, characterized in that: The upright plate is a bent plate, and the upright plate has multiple mounting holes spaced from top to bottom on the part facing the frame, and is detachably connected to the frame by fasteners; the width of the upright plate gradually increases from top to bottom on the part perpendicular to the frame, and the end of the pedal in the length direction is fixed to the part of the upright plate perpendicular to the frame.

5. A flexible treadmill ladder for engineering machinery according to claim 1, characterized in that: When the movable ladder section is a frame, the transverse part of the frame is a tread, and a third rotating frame is fixed at each end of the tread along its length. The longitudinal part of the frame consists of two opposing upright plate assemblies, each upright plate assembly including a connector and rotating parts fixed to the upper and lower parts of the connector; The top of the upper rotating component is inserted into the first rotating frame in the fixed ladder section, and the hinge holes of the two are aligned before the hinge is inserted. The bottom of the lower rotating component is inserted into the third rotating frame, and the hinge holes of the two are aligned before the hinge is inserted.

6. A flexible treadmill ladder for engineering machinery according to claim 5, characterized in that: The connector is a flexible connector, which constitutes the flexible segment; the connector has a pressure plate on the other side that contacts the rotating component, and fasteners pass through the three components to fix them together.

7. A flexible treadmill ladder for engineering machinery according to claim 1, characterized in that: When the movable stair section consists of two frame sections, the transverse part of frame section I is step I, and a second rotating frame is fixed at each end of the length direction of step I; the transverse part of frame section II is step II, and a third rotating frame is fixed at each end of the length direction of step II. The longitudinal part of the frame I consists of two opposing upright plate assemblies I, each upright plate assembly I including a connector I and a rotating component I fixed to the upper and lower parts of the connector I; The top of the upper rotating component I is inserted into the first rotating frame in the fixed ladder section, and the hinge holes of the two are aligned and then inserted into the hinge. The bottom of the lower rotating component I is inserted into the upper part of the second rotating frame, and the hinge holes of the two are aligned and then inserted into the hinge. The longitudinal part of the frame II consists of two opposing upright plate assemblies II, each upright plate assembly II including a connector II and a rotating component II fixed to the upper and lower parts of the connector II; The top of the upper rotating component II is inserted into the lower part of the second rotating frame, and the hinge holes of the two are aligned and then inserted into the hinge. The bottom of the lower rotating component II is inserted into the third rotating frame, and the hinge holes of the two are aligned before the hinge is inserted.

8. A flexible treadmill ladder for engineering machinery according to claim 7, characterized in that: Both connector I and connector II are flexible connectors, and the flexible connectors constitute the flexible segment, with connector II being longer than connector I; The connecting member I has a pressure plate on the other side that contacts the rotating part I, and the fastener passes through the three parts to fix them together. The connecting member II has a pressure plate on the other side that contacts the rotating component II, and the fastener passes through the three components to fix them together.

9. A flexible treadmill ladder for engineering machinery according to claim 1, characterized in that: The pedals in both the fixed and movable stair sections are provided with anti-slip strips of equal length to the long side of the pedals along the edge away from the vehicle body.

10. A flexible trolley ladder for engineering machinery according to claim 9, characterized in that: Threaded holes are provided at both ends of the top surface of the pedal along its length, and through holes arranged coaxially with the threaded holes are provided at both ends of the anti-slip strip along its length. The pedal and the anti-slip strip are detachably connected by fasteners.

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