Climbing ladder device of bulldozer and bulldozer

Abstract

The utility model relates to a kind of ladder climbing devices of bulldozer, including ladder body, locking assembly, slide rail fixed on bulldozer, ladder body is slidably connected with slide rail, pulley is rotatably connected on ladder body, pulley is slidably connected with slide rail;The front end of slide rail is equipped with limit bearing, when ladder body is unfolded, ladder body is erected on the side of track of bulldozer to form up and down passage, when ladder body is folded, ladder body can slidably rotate away from track and be fixed above slide rail by locking assembly.The ladder climbing body of ladder climbing device can be erected on track, it is convenient for operator to get on cab by ladder climbing device, belong to bulldozer technical field.

Description

Technical Field

[0001] This utility model relates to the field of bulldozer technology, specifically to a ladder device for a bulldozer and a bulldozer. Background Technology

[0002] Bulldozers are heavy construction machinery widely used in building, mining, road construction, and other fields. They are typically equipped with high-powered engines and tracked walking systems, providing excellent traction, stability, and the ability to traverse complex terrain. Mainstream bulldozer models, such as the SEM818F and SEM824F, demonstrate strong adaptability and high efficiency in actual operations.

[0003] However, because these bulldozers generally use large tracks and drive wheels, the cab is quite high off the ground. Operators often have to climb directly onto the track surface to get in and out of the bulldozer. In actual working conditions, the tracks easily accumulate mud, gravel, or other work residue, making the track surface slippery and uneven. Especially in rainy or snowy weather, at night, or in complex terrain, climbing the tracks by hand poses a significant safety hazard, easily leading to slips, falls, and other accidents, affecting work efficiency and threatening the personal safety of the operators.

[0004] Currently, although some bulldozers are equipped with simple handrails, overall, there is still a lack of a systematic climbing assistance device that is structurally sound, easy to use, and highly safe. Utility Model Content

[0005] In view of the technical problems existing in the prior art, the purpose of this utility model is to provide a climbing ladder device for a bulldozer and a bulldozer, wherein the main body of the climbing ladder device can be mounted on the tracks, making it convenient for the operator to climb the ladder device to reach the cab.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A ladder device for a bulldozer includes a ladder body, a locking component, and a slide rail fixed to the bulldozer. The ladder body and the slide rail are slidably and rotatably connected. A pulley is rotatably connected to the ladder body, and the pulley is slidably connected to the slide rail. A limiting bearing component is provided at the front end of the slide rail. When the ladder body is unfolded, it is erected on one side of the bulldozer track to form an upper and lower passage. When the ladder body is folded, it can slide and rotate away from the track and be fixed above the slide rail by the locking component.

[0007] As a preferred embodiment, the ladder device also includes a hinge, which has two blades that are rotatably connected. One blade is located on the outside of the pulley, and the other blade is fixedly connected to the upper part of the ladder.

[0008] As a preferred embodiment, the ladder body includes multiple transverse angle steels and two longitudinal angle steels. The two longitudinal angle steels are located on both sides of the ladder body, and the multiple transverse angle steels are connected between the two longitudinal angle steels. The multiple transverse angle steels are arranged at equal intervals along the length direction of the longitudinal angle steels, and the inner side of one longitudinal angle steel is connected to a hinge.

[0009] As a preferred option, the rear end of the slide rail is equipped with a limiting component to prevent the pulley from falling outward.

[0010] As a preferred option, the slide rail is made of C-shaped steel, and the pulley is made of standard bearings. The C-shaped steel includes an inner groove, and the standard bearing is located inside the inner groove.

[0011] As a preferred embodiment, the locking component is located at the bottom of the ladder body and the rear end of the slide rail. When the ladder body rotates to the top of the slide rail, the locking component locks and fixes the ladder body in place.

[0012] As a preferred embodiment, the locking assembly includes a pin and a slot. The slot is fixedly connected to the end of the slide rail. Two round tubes are provided at one end of the ladder body. The axis of the two round tubes is collinear. The pin is inserted into the two round tubes and is slidably connected to the two round tubes. The pin is fixedly connected to a handle, which is located between the two round tubes. When the ladder body rotates to the top of the slide rail, the two round tubes are arranged vertically, and the pin can be inserted into the slot.

[0013] A bulldozer includes the aforementioned ladder device for the bulldozer.

[0014] This utility model has the following advantages: This application utilizes a ladder device to assist operators in climbing onto the track, avoiding direct climbing of the track surface. The cooperative design of pulleys and rails allows for flexible adjustment of the ladder's position, while locking components ensure stability in the retracted state. This unfoldable and retractable structure solves the climbing safety issue while avoiding interference with normal equipment operation. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this utility model 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 utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the ladder device of the bulldozer of this utility model when it is folded up.

[0017] Figure 2 for Figure 1 A structural diagram from another angle.

[0018] Figure 3This is a schematic diagram of the ladder device of the bulldozer of this utility model when it is unfolded.

[0019] Figure 4 This is a schematic diagram of the structure of the ladder device on a bulldozer when it is folded up.

[0020] Figure 5 This is a schematic diagram of the structure when the ladder device is used on a bulldozer.

[0021] Among them, 1. ladder body; 2. locking assembly; 3. slide rail; 4. pulley; 5. limiting bearing; 6. hinge; 7. transverse angle steel; 8. longitudinal angle steel; 9. limiting component; 10. pin rod; 11. slot; 12. handle; 13. bulldozer; 14. ladder climbing device; 15. track; 16. round tube fitting. Detailed Implementation

[0022] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] Example 1 like Figures 1 to 5 As shown, in existing technologies, bulldozers 13 generally employ large-sized tracks 15, resulting in a significant height difference between the cab and the ground. Operators must climb directly onto the side surface in front of the tracks 15 to access the bulldozer 13. However, the tracks 15 are prone to accumulating mud and gravel, making the surface slippery, especially in rainy or snowy weather or complex terrain, posing a risk of slipping and falling. While existing technologies include simple handrail structures, they lack a systematic climbing assistance system, failing to effectively address the climbing safety issue.

[0024] To address the aforementioned issues and the technical drawback of slippery track 15 surface leading to climbing hazards, an independent climbing path was initially considered for the side of track 15. However, a fixed ladder 1 might interfere with normal equipment operation, necessitating a retractable structure. Further analysis revealed that ladder 1 needs to be both unfoldable and foldable, while ensuring stability in its folded state. Therefore, ladder 1 and slide rail 3 were designed with a sliding and rotating connection, with pulleys 4 ensuring smooth movement, and a locking component 2 addressing the folding and securing issue.

[0025] Therefore, this application proposes a ladder device 14 for a bulldozer 13, including a ladder body 1, a locking component 2, and a slide rail 3 fixed to the bulldozer 13. The ladder body 1 and the slide rail 3 are slidably and rotatably connected. A pulley 4 is rotatably connected to the ladder body 1, and the pulley 4 is slidably connected to the slide rail 3. A limiting bearing member 5 is provided at the front end of the slide rail 3. When the ladder body 1 is unfolded, the ladder body 1 is erected on one side of the track 15 of the bulldozer 13 to form an upper and lower passage for the operator. The limiting bearing member 5 prevents the ladder body 1 from detaching from the front end of the slide rail 3 while also bearing part of the weight of the ladder body 1 and the operator. When the ladder body 1 is folded, the ladder body 1 can slide and rotate away from the track 15 and be fixed above the slide rail 3 by the locking component 2. The ladder 1 is a rigid frame structure that supports the operator's climbing ability. It can be implemented using a mesh structure formed by welding angle steel, with its transverse members providing foot support. The slide rail 3 is a guide component fixed to the bulldozer 13, which can be implemented using C-shaped steel rails, with its inner groove space accommodating pulleys 4. The pulley 4 is a rolling component that allows the ladder 1 and slide rail 3 to slide relative to each other. It can be implemented using standard bearings, with the outer ring of the bearing contacting the inner wall of the slide rail 3 to reduce frictional resistance. The locking component 2 is a fixing device that restricts the movement of the ladder 1. It can be implemented using a pin and slot 11 mating structure, with the pin inserted into the slot 11 to form a mechanical lock.

[0026] Specifically, the ladder 1 is slidably connected to the slide rail 3 via pulley 4, allowing the operator to move the ladder 1 along the slide rail 3. When the ladder 1 slides to the side of the track 15, it unfolds by rotating to form an inclined climbing path. At this time, the pulley 4 rolls along the inner groove of the slide rail 3 to ensure smooth movement. The load-bearing point of the climbing device 14 that supports the weight of the operator mainly relies on the force exerted by the ladder 1 on the track 15, as well as the load-bearing component 5 supporting part of the weight of the ladder 1 and the operator. Before entering the cab, the operator pushes the ladder 1 to slide it along the slide rail 3 away from the track 15, rotates the ladder 1 to above the slide rail 3, and after the ladder 1 is in contact with the upper surface of the bulldozer 13, the locking component 2 fixes the ladder 1 in the retracted state. The operator then enters the cab. During this process, the pulley 4 always remains in contact with the slide rail 3 to prevent the ladder 1 from derailing.

[0027] This application uses a ladder device 14 to assist operators in climbing onto the track 15, avoiding direct climbing on the surface of the track 15. The cooperative design of the pulley 4 and the slide rail 3 allows for flexible adjustment of the ladder body 1's position, and the locking component 2 ensures stability in the retracted state. This unfoldable and retractable structure solves the climbing safety problem and avoids interference with the normal operation of the equipment.

[0028] This application further proposes a hinge 6 structure, which includes two rotatably connected blades. One blade is fixedly connected to the outside of the pulley 4, and the other blade is fixedly connected to the upper part of the ladder 1.

[0029] The two blades of hinge 6 rotate relative to each other via a pivot, which can be achieved using a standard hinge 6. The axis of the pivot is parallel to the axis of rotation of pulley 4. The blades fixedly connected to the upper part of ladder 1 are fixed to the frame of ladder 1 by welding or bolting, forming a stable pivot point.

[0030] Specifically, when the ladder 1 moves along the slide rail 3, the pulley 4 rolls within the slide rail 3, providing longitudinal freedom of movement, and the hinge 6 structure allows the ladder 1 to move laterally along the slide rail 3. When the ladder 1 needs to be mounted on the side of the track 15, the ladder 1 can rotate downwards around the hinge 6 pivot and the pulley 4 together, so that the ladder 1 conforms to the side profile of the track 15.

[0031] This application further proposes that the ladder body 1 includes multiple transverse angle steels 7 and two longitudinal angle steels 8, the two longitudinal angle steels 8 are located on both sides of the ladder body 1, the multiple transverse angle steels 7 are connected between the two longitudinal angle steels 8, the multiple transverse angle steels 7 are arranged at equal intervals along the length direction of the longitudinal angle steels 8, and the inner side of one longitudinal angle steel 8 is connected to a hinge 6.

[0032] The transverse angle steel 7 refers to the supporting component spanning between the longitudinal angle steels 8 on both sides. It can be implemented using L-shaped cross-section steel, forming a stepping platform on its horizontal surface and welded and fixed to the longitudinal angle steels 8 on its vertical surface. The longitudinal angle steels 8 refer to the load-bearing frame arranged along the length of the ladder 1, also implemented using L-shaped cross-section steel. Equal spacing means that the transverse angle steels 7 are evenly distributed, specifically using a spacing of 200-300 mm, forming a stepped structure through fixed intervals.

[0033] When the operator steps on it, the load is transmitted through the horizontal plane of the transverse angle steel 7 to the longitudinal angle steels 8 on both sides, avoiding local deformation caused by single-point force.

[0034] This application further proposes a limiting member 9 at the rear end of the slide rail 3 to prevent the pulley 4 from falling outward. Among them, the limiting component 9 refers to the physical blocking structure set at the end of the slide rail 3. Specifically, it can be achieved by welding a baffle or bolt fixing a protrusion. Its height exceeds the edge of the opening of the slide rail 3 to prevent the pulley 4 from shifting laterally.

[0035] When the ladder 1 is retracted, the rear limiter 9 restricts the backward movement of the pulley 4, preventing the pulley 4 from sliding off the end of the slide rail 3. When the bulldozer 13 vibrates during operation, the limiter 9 maintains a stable connection between the pulley 4 and the slide rail 3 through mechanical blocking, preventing the ladder 1 from accidentally derailing due to inertial impact.

[0036] This application further proposes that the locking component 2 is located at the lower part of the ladder body 1 and the rear end of the slide rail 3. When the ladder body 1 rotates to the top of the slide rail 3, the locking component 2 locks and fixes the ladder body 1.

[0037] The locking component 2 refers to the mechanical structure used to restrict the relative movement between the ladder body 1 and the slide rail 3. Specifically, it can be implemented using a rigid locking mechanism that engages a pin and a slot 11, eliminating the degree of freedom of the ladder body 1 through physical obstruction. The lower part of the ladder body 1 refers to the structural area of ​​the ladder body 1 near the ground.

[0038] Specifically, when the ladder 1 rotates around the slide rail 3 and moves above the slide rail 3, the lower part of the ladder 1 and the rear end of the slide rail 3 are spatially aligned. The operator inserts the pin 10 into the slot 11, and the pin 10 does not detach from the slot 11 due to gravity.

[0039] This application further proposes a locking component 2 including a pin 10 and a slot 11. The slot 11 is fixedly connected to the end of the slide rail 3. Two round tubes 16 are provided at one end of the ladder body 1. The axis lines of the two round tubes 16 are collinear. The pin 10 inserted into the two round tubes 16 is slidably connected to the two round tubes. The pin 10 is fixedly connected to a handle 12, which is located between the two round tubes 16. When the ladder body 1 rotates to the top of the slide rail 3, the two round tubes 16 are arranged vertically, and the pin 10 can be inserted into the slot 11.

[0040] The pin 10 is a rigid rod-shaped component inserted into the slot 11. It can be made of galvanized round steel, with its diameter fitting a clearance fit with the inner diameter of the slot 11. Axial movement enables locking and unlocking. The slot 11 is a limiting structure fixed to the end of the slide rail 3, which can be made of a seamless steel pipe welded to the end of the slide rail 3. Its opening direction is aligned with the movement trajectory of the pin 10. The round tube 16 is a guide component welded to the end of the ladder body 1. It can be made of seamless steel pipe cut into sections and then welded together. The collinear arrangement of the two round tubes 16 forms a sliding channel for the pin 10, ensuring that the pin 10 moves along a predetermined path. The handle 12 is an operating component connected to the middle of the pin 10. It can be made of a round steel rod welded together and positioned between the two round tubes 16 to prevent the pin 10 from dislodging from them. Specifically, when the ladder 1 rotates around the slide rail 3 to a fixed position, the two round tubes 16 are arranged vertically, and the axis of the pin 10 is on the same vertical line as the opening of the slot 11. The operator applies downward force by holding the handle 12, pushing the pin 10 vertically down along the guide channel of the round tube 16 until the end of the pin 10 is fully inserted into the slot 11 at the end of the slide rail 3. When unlocking is required, pulling the handle 12 upward will disengage the pin 10 from the slot 11, releasing the folding and fixing of the ladder 1.

[0041] Example 2 A bulldozer 13 includes a ladder device 14 as described in Embodiment 1 above.

[0042] Through the above technical solution, this application provides operators with a dedicated climbing passage connecting to the bulldozer body 13, eliminating the safety hazards of directly climbing the slippery tracks 15. Operators ascend to the platform above the tracks via the ladder device 14, then fold up the ladder body 1 before entering the cab. The foldable design of the ladder body 1 avoids interference with normal equipment operation when not in use, and the cooperative structure of the slide rail 3 and pulley 4 ensures the load-bearing stability of the ladder body 1 when unfolded. The mechanical interlocking mechanism of the locking component 2 effectively prevents accidental displacement of the ladder body 1 during equipment operation, ensuring operational safety.

[0043] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A ladder device for a bulldozer, characterized in that: Includes a ladder (1), a locking component (2), and a slide rail (3) fixed to the bulldozer (13). The ladder (1) and the slide rail (3) are slidably and rotatably connected. A pulley (4) is rotatably connected to the ladder (1), and the pulley (4) is slidably connected to the slide rail (3). A limiting bearing (5) is provided at the front end of the slide rail (3). When the ladder (1) is unfolded, the ladder (1) is erected on one side of the track (15) of the bulldozer (13) to form an upper and lower passage. When the ladder (1) is folded, the ladder (1) can slide and rotate away from the track (15) and be fixed above the slide rail (3) by the locking component (2).

2. The climbing ladder device for a bulldozer according to claim 1, characterized in that: It also includes a hinge (6), which has two blades that are rotatably connected. One blade is located on the outside of the pulley (4), and the other blade is fixedly connected to the upper part of the ladder (1).

3. The ladder device for a bulldozer according to claim 2, characterized in that: The ladder (1) includes multiple transverse angle steels (7) and two longitudinal angle steels (8). The two longitudinal angle steels (8) are located on both sides of the ladder (1). Multiple transverse angle steels (7) are connected between the two longitudinal angle steels (8). Multiple transverse angle steels (7) are arranged at equal intervals along the length direction of the longitudinal angle steels (8). The inner side of one longitudinal angle steel (8) is connected to a hinge (6).

4. The ladder device for a bulldozer according to claim 2, characterized in that: The rear end of the slide rail (3) is provided with a limiting member (9) to prevent the pulley (4) from falling outward.

5. The ladder device for a bulldozer according to claim 1, characterized in that: The slide rail (3) is made of C-shaped steel, and the pulley (4) is made of standard bearing. The C-shaped steel includes an inner groove, and the standard bearing is located inside the inner groove.

6. The ladder device for a bulldozer according to claim 1, characterized in that: The locking component (2) is located at the bottom of the ladder body (1) and the rear end of the slide rail (3). When the ladder body (1) rotates to the top of the slide rail (3), the locking component (2) locks the ladder body (1) in place.

7. A ladder device for a bulldozer according to claim 6, characterized in that: The locking assembly (2) includes a pin (10) and a slot (11). The slot (11) is fixedly connected to the end of the slide rail (3). Two round tubes (16) are provided at one end of the ladder body (1). The axis lines of the two round tubes (16) are collinear. The pin (10) inserted into the two round tubes (16) is slidably connected to the two round tubes (16). The pin (10) is fixedly connected to a handle (12). The handle (12) is located between the two round tubes (16). When the ladder body (1) rotates to the top of the slide rail (3), the two round tubes (16) are arranged vertically, and the pin (10) can be inserted into the slot (11).

8. A bulldozer (13), characterized in that: Includes a ladder device for a bulldozer as described in any one of claims 1-7.

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