Retractable ladder for mining dump truck

Abstract

The retractable ladder for the mining dump truck comprises an installation frame, a ladder body, a connecting rod mechanism and a push rod assembly, the installation frame and the ground are welded to a platform on the lower portion of the dump truck in parallel, the ladder body is rotatably arranged at one end of the installation frame, and the middle of the connecting rod mechanism is rotatably arranged at the other end of the installation frame. One end of the connecting rod mechanism is connected with the ladder and used for driving the ladder to turn over, the push rod assembly is arranged on a lower platform, close to one side of the mounting frame, of the dumper, and the output end of the push rod assembly is connected with the other end of the connecting rod mechanism and used for providing power for the connecting rod mechanism; the rotating frames are symmetrically arranged at two ends of the power rod, one ends of the upper supporting rods are welded on the rotating frames, and the lower supporting rods are rotatably arranged at the other ends of the upper supporting rods. The ladder is simple in structure and small in occupied space, effectively avoids collision between the ladder and the ground in the running process of the dumper, and effectively prolongs the service life of the ladder.

Description

Technical Field

[0001] This utility model belongs to the technical field of mining dump trucks, and in particular relates to a retractable ladder for mining dump trucks. Background Technology

[0002] The cab of a mining dump truck is located relatively high. To reach the cab from the ground, the driver needs to use two ladders. The lower ladder connects the ground to the lower platform, while the upper ladder connects the lower platform to the cab platform.

[0003] Due to the uneven surface of the mine, the lower section of the ladder frequently hits the ground during vehicle operation, causing damage. A common practice is to use rubber sheets on the sides of the lower ladder, with the thickness of the rubber sheets parallel to the direction of vehicle movement. When the ladder hits the ground during vehicle operation, the rubber sheets bend elastically and then return to their original shape. However, when personnel are boarding, the wider rubber sheets are less prone to bending in the width direction, providing support against lateral forces. Over time, the rubber sheets on this ladder soften quickly after repeated impacts. The softened rubber sheets are insufficient to support the boarding action, causing the ladder to swing backward and making boarding difficult. Utility Model Content

[0004] To address some or all of the technical problems existing in the prior art, this utility model provides a retractable ladder for a mining dump truck, comprising a mounting frame, a ladder, a linkage mechanism, and a push rod assembly. The mounting frame is welded parallel to the ground to the lower platform of the dump truck. The ladder is rotatably mounted at one end of the mounting frame. The middle part of the linkage mechanism is rotatably mounted at the other end of the mounting frame. One end of the linkage mechanism is connected to the ladder for rotating the ladder. The push rod assembly is located on the lower platform of the dump truck near the mounting frame. The output end of the push rod assembly is connected to the other end of the linkage mechanism for providing power to the linkage mechanism.

[0005] The linkage mechanism includes a power rod, a rotating frame, an upper support rod, and a lower support rod. The rotating frame is symmetrically arranged at both ends of the power rod. One end of the upper support rod is welded to the rotating frame, and the lower support rod is rotatably arranged at the other end of the upper support rod.

[0006] Furthermore, in the aforementioned retractable ladder for mining dump trucks, the rotating frame is L-shaped, one end of the rotating frame is welded to the power rod, the other end of the rotating frame is welded to the upper support rod, a first hinge hole is provided in the middle of the rotating frame, a first hinge ear connecting seat is provided on the inner side of one end of the mounting frame, and the first hinge hole on the rotating frame is connected to the first hinge ear connecting seat through a hinge shaft.

[0007] Furthermore, in the aforementioned retractable ladder for mining dump trucks, the push rod assembly includes a fixed support, an electric push rod, and a push rod connecting hinge sleeve. The fixed support is bolted to the lower platform of the dump truck, the electric push rod is fixed to the fixed support via a hinge shaft, the output end of the electric push rod is connected to the push rod connecting hinge sleeve via the hinge shaft, and the push rod connecting hinge sleeve is sleeved on the middle of the power rod.

[0008] Furthermore, in the aforementioned retractable ladder for mining dump trucks, a first hinge platform is welded to one end of the upper support rod, a second hinge platform is welded to one end of the lower support rod, and a third hinge platform is welded to the other end of the lower support rod. The upper support rod and the lower support rod are connected by a hinge shaft between the first hinge platform and the second hinge platform.

[0009] Furthermore, in the aforementioned retractable ladder for mining dump trucks, a fourth hinge platform is symmetrically welded to both sides of the top of the ladder, and a fifth hinge platform is symmetrically welded to both sides of the middle of the ladder. A second hinge lug connecting seat is provided at the bottom of the mounting frame. The fourth hinge platform on the ladder is connected to the second hinge lug connecting seat through a hinge shaft. The lower support rod is connected to the ladder through the hinge shaft of the third hinge platform and the fifth hinge platform.

[0010] Furthermore, in the aforementioned retractable ladder for mining dump trucks, the mounting frame is rectangular, the lengths of the upper support rod and the lower support rod are both less than the internal length of the mounting frame, and the width of the ladder is less than the internal width of the mounting frame.

[0011] The retractable ladder for mining dump trucks of this utility model has the following advantages and beneficial effects:

[0012] This utility model has a simple structure and occupies little space. It can be hidden when folded up, effectively preventing the ladder from colliding with the ground during the operation of the dump truck and effectively improving the service life of the ladder. Attached Figure Description

[0013] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 for further understanding of the embodiments of the present invention and constitute a part of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. In the drawings:

[0014] Figure 1 This is a schematic diagram of the retractable ladder for a mining dump truck according to the present invention.

[0015] Figure 2 This is a schematic diagram of the unfolded structure of the retractable ladder for a mining dump truck according to this utility model;

[0016] Figure 3 This is a schematic diagram of the linkage mechanism for the retractable ladder used in a mining dump truck according to this utility model;

[0017] Figure 4 This is a schematic diagram of the power rod installation structure for the retractable ladder used in a mining dump truck according to this utility model;

[0018] Figure 5 This is a schematic diagram of the installation frame structure of the retractable ladder for a mining dump truck according to this utility model;

[0019] Figure 6 This is a schematic diagram of the ladder structure of the retractable ladder for mining dump trucks according to this utility model.

[0020] Explanation of reference numerals in the attached figures:

[0021] 1: Mounting frame; 11: First hinge lug connector; 12: Second hinge lug connector;

[0022] 2: Ladder; 21: Fourth hinge platform; 22: Fifth hinge platform;

[0023] 3: Linkage mechanism; 31: Power rod;

[0024] 32: Rotating frame; 321: First hinge hole;

[0025] 33: Upper strut; 331: First hinged platform;

[0026] 34: Lower strut; 341: Second hinge platform; 342: Third hinge platform;

[0027] 4: Push rod assembly; 41: Fixed support; 42: Electric push rod; 43: Push rod connecting hinge sleeve. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings. Obviously, the described embodiments are only a part of the embodiments of this utility model, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0029] like Figure 1-6As shown, the retractable ladder for a mining dump truck of this utility model includes a mounting frame 1, a ladder 2, a linkage mechanism 3, and a push rod assembly 4. The mounting frame 1 is welded parallel to the ground to the lower platform of the dump truck. The ladder 2 is rotatably mounted at one end of the mounting frame 1. The middle part of the linkage mechanism 3 is rotatably mounted at the other end of the mounting frame 1. One end of the linkage mechanism 3 is connected to the ladder 2 to drive the ladder 2 to rotate. The push rod assembly 4 is mounted on the lower platform of the dump truck near the mounting frame 1. The output end of the push rod assembly 4 is connected to the other end of the linkage mechanism 3 to provide power to the linkage mechanism 3.

[0030] The linkage mechanism 3 includes a power rod 31, a rotating frame 32, an upper support rod 33, and a lower support rod 34. The rotating frame 32 is symmetrically arranged at both ends of the power rod 31. One end of the upper support rod 33 is welded to the rotating frame, and the lower support rod 34 is rotatably arranged at the other end of the upper support rod 33.

[0031] Furthermore, in the retractable ladder for mining dump trucks of this utility model, the rotating frame 32 is arranged in an L-shape. One end of the rotating frame 32 is welded to the power rod 31, and the other end of the rotating frame 32 is welded to the upper support rod 33. A first hinge hole 321 is provided at the top corner of the rotating frame 32. A first hinge ear connecting seat 11 is provided on the inner side of one end of the mounting frame 1. The first hinge hole 321 on the rotating frame 32 is connected to the first hinge ear connecting seat 11 through a hinge shaft, so that the rotating frame 32 can rotate around the first hinge ear connecting seat 11 through the first hinge hole 321.

[0032] Furthermore, in the retractable ladder for mining dump trucks of this utility model, the push rod assembly 4 includes a fixed support 41, an electric push rod 42, and a push rod connecting hinge sleeve 43. The fixed support 41 is installed on the lower platform of the dump truck by bolts. The electric push rod 42 is fixed on the fixed support 41 by a hinge shaft. The output end of the electric push rod 42 is connected to the push rod connecting hinge sleeve 43 by a hinge shaft. The push rod connecting hinge sleeve 43 is sleeved on the middle of the power rod 31, thereby providing power to the power rod 31 through the extension and retraction of the electric push rod 42.

[0033] Preferably, the electric push rod 42 is connected to the battery, and control switches are provided in both the cab and near the ground. The control switches are connected to the electric push rod 42 for easy operation by the operator.

[0034] Furthermore, in the retractable ladder for mining dump trucks of this utility model, a first hinge platform 331 is welded to one end of the upper support rod 33, a second hinge platform 341 is welded to one end of the lower support rod 34, and a third hinge platform 342 is welded to the other end of the lower support rod 34. The upper support rod 33 and the lower support rod 34 are connected by a hinge shaft between the first hinge platform 331 and the second hinge platform 341, thereby effectively ensuring that the lower support rod 34 can be folded by gravity when the upper support rod 33 is pulled up by the rotating frame 32, so that the lower support rod 34 and the upper support rod 33 can be stored in the mounting frame 1 when the ladder 2 is retracted.

[0035] Furthermore, in the retractable ladder for mining dump trucks of this utility model, the top two sides of the ladder 2 are symmetrically welded with fourth hinge platforms 21, and the middle two sides of the ladder 2 are symmetrically welded with fifth hinge platforms 22. The bottom of the mounting frame 1 is provided with a second hinge ear connecting seat 12. The fourth hinge platform 21 on the ladder 2 is connected to the second hinge ear connecting seat 12 through a hinge shaft. The lower support rod 34 is connected to the ladder 2 through the third hinge platform 342 and the hinge shaft of the fifth hinge platform 22, thereby effectively ensuring that the ladder 2 can rotate 90 degrees around the fourth hinge platform 21 through the linkage mechanism 3.

[0036] Furthermore, in the retractable ladder for mining dump trucks of this utility model, the mounting frame 1 is rectangular, the lengths of the upper support rod 33 and the lower support rod 34 are both less than the internal length of the mounting frame 1, and the width of the ladder 2 is less than the internal width of the mounting frame 1, thereby effectively ensuring that the upper support rod 33 and the lower support rod 34 can rotate within the mounting frame 1 without interference, and when the ladder 2 is retracted, the connecting rod is hidden inside the frame.

[0037] Specifically, during use, the electric push rod 42 extends, and the output end of the electric push rod 42 pushes the rotating frame 32 to rotate on the first hinge connecting seat 11 through the power rod 31, causing the upper support rod 33 to move towards the ground. Under the action of gravity, the support rod 34 rotates around the first hinge platform 331 of the upper support rod 33 through the second hinge platform 341. At the same time, the ladder 2 rotates around the second hinge connecting seat 12 through the fourth hinge platform 21 until the ladder 2 is perpendicular to the ground and the electric push rod 42 stops working. When folding, the electric push rod 42 retracts, and the output end of the electric push rod 42 pulls the rotating frame 32 to rotate through the power rod 31. While the rotating frame 32 is rotating, the upper support rod 33 and the lower support rod 34 pull the ladder 2 to rotate towards the mounting frame 1. At the same time, the lower support rod 34 and the upper support rod 33 are folded and stored in the mounting frame 1. At this time, the ladder 2 is parallel to the mounting frame 1, and the electric push rod 42 stops working.

[0038] In summary, compared with the prior art, the retractable ladder for mining dump trucks of this utility model has the following advantages and beneficial effects:

[0039] This utility model has a simple structure and occupies little space. It can be hidden when folded up, effectively preventing the ladder from colliding with the ground during the operation of the dump truck and effectively improving the service life of the ladder.

[0040] It should be noted that, unless otherwise expressly specified and limited, the term "connection" or its synonyms should be interpreted broadly in this document. For example, "connection" can be a fixed connection or a detachable connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be the internal communication of two elements or the interaction between two elements. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. Furthermore, expressions such as "first" and "second" are merely used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Meanwhile, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. In addition, the terms "front," "rear," "left," "right," "upper," and "lower" in this document refer to the placement states shown in the accompanying drawings.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and not to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A retractable ladder for a mining dump truck, installed on the lower platform of the dump truck, characterized in that, The retractable ladder for the mining dump truck includes a mounting frame, a ladder, a linkage mechanism, and a push rod assembly. The mounting frame is welded parallel to the ground to the lower platform of the dump truck. The ladder is rotatably mounted at one end of the mounting frame. The middle part of the linkage mechanism is rotatably mounted at the other end of the mounting frame. One end of the linkage mechanism is connected to the ladder for rotating the ladder. The push rod assembly is located on the lower platform of the dump truck near the mounting frame. The output end of the push rod assembly is connected to the other end of the linkage mechanism for providing power to the linkage mechanism. The linkage mechanism includes a power rod, a rotating frame, an upper support rod, and a lower support rod. The rotating frame is symmetrically arranged at both ends of the power rod. One end of the upper support rod is welded to the rotating frame, and the lower support rod is rotatably arranged at the other end of the upper support rod.

2. The retractable ladder for mining dump trucks according to claim 1, characterized in that, The rotating frame is L-shaped. One end of the rotating frame is welded to the power rod, and the other end of the rotating frame is welded to the upper support rod. A first hinge hole is provided in the middle of the rotating frame. A first hinge ear connecting seat is provided on the inner side of one end of the mounting frame. The first hinge hole on the rotating frame is connected to the first hinge ear connecting seat through a hinge shaft.

3. The retractable ladder for mining dump trucks according to claim 1, characterized in that, The push rod assembly includes a fixed support, an electric push rod, and a push rod connecting hinge sleeve. The fixed support is bolted to the lower platform of the dump truck. The electric push rod is fixed to the fixed support via a hinge shaft. The output end of the electric push rod is connected to the push rod connecting hinge sleeve via the hinge shaft. The push rod connecting hinge sleeve is sleeved on the middle of the power rod.

4. The retractable ladder for mining dump trucks according to claim 1, characterized in that, The upper support rod has a first hinge platform welded to one end, the lower support rod has a second hinge platform welded to one end, and the lower support rod has a third hinge platform welded to the other end. The upper support rod and the lower support rod are connected by a hinge shaft between the first hinge platform and the second hinge platform.

5. The retractable ladder for mining dump trucks according to claim 4, characterized in that, The ladder has a fourth hinge platform symmetrically welded on both sides of the top, and a fifth hinge platform symmetrically welded on both sides of the middle. The bottom of the mounting frame is provided with a second hinge lug connecting seat. The fourth hinge platform on the ladder is connected to the second hinge lug connecting seat through a hinge shaft. The lower support rod is connected to the ladder through the hinge shaft of the third hinge platform and the fifth hinge platform.

6. The retractable ladder for mining dump trucks according to claim 1, characterized in that, The mounting frame is rectangular, and the lengths of the upper support rod and the lower support rod are both less than the internal length of the mounting frame, while the width of the ladder is less than the internal width of the mounting frame.

Images