Off-highway dump truck on-board step and off-highway dump truck

Abstract

The utility model discloses a non -highway dump truck is on the car step and non -highway dump truck, is on the car step including primary step, secondary step, tertiary step, primary step with secondary step is connected through canvas belt, secondary step includes footrest, a pair of connecting pieces, the connecting piece includes footrest connecting plate, a pair of hinge, connecting plate, first fixed plate, footrest connecting plate with footrest is connected, and the hinge's first connecting part of low -lying is connected with footrest connecting plate, and the bottom and top of connecting plate are connected with a pair of hinge's second connecting part respectively. The utility model has the beneficial effect that the connecting mode between secondary step and tertiary step is designed as the connecting mode with the activity allowance, can slow down the situation that the strong rigid contact between the obstacle and secondary step, tertiary step generates and then wears and deforms, improves the safety of driver's getting on and off the car.

Description

Technical Field

[0001] This utility model relates to the technical field of off-highway dump trucks. More specifically, this utility model relates to a loading step for an off-highway dump truck. Background Technology

[0002] Off-highway dump trucks are key equipment in open-pit coal mines, cement and building material mines, sand and gravel aggregate mines, metal and non-metal mines, water conservancy and hydropower projects, and large-scale engineering mining and construction. They are characterized by high loading and unloading capacity, heavy load capacity, short transport distance, and long continuous working time. Off-highway dump trucks often travel on winding, potholed roads, making road conditions more challenging than on-highway dump trucks. The cab of an off-highway dump truck is significantly higher than the ground, requiring the driver to climb ladders or use multiple steps to get in and out. Comparatively, ladders require more space and complicate the overall vehicle layout; multiple steps save space and simplify the layout. Currently, the secondary and tertiary steps of off-highway dump trucks are mainly connected by bolts. This structure is characterized by its simple manufacturing process and convenient installation, but it lacks flexibility. When off-highway dump trucks are running in mining areas, the secondary and tertiary steps are easily deformed when they collide with obstacles such as rocks and soil, which makes it inconvenient for the driver to get on and off the vehicle. In fact, due to the step problem, if the driver misses a step or does not step firmly, the driver may fall and cause a safety accident. Utility Model Content

[0003] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0004] Another objective of this invention is to provide a loading step for off-highway dump trucks, which designs the connection between the second and third steps as a connection with a margin of flexibility. When encountering obstacles, the margin of flexibility can reduce the strong rigid contact between the obstacle and the second and third steps, thus mitigating wear and deformation. This ensures that the structure of the second and third steps remains as intact as possible, facilitating driver entry and exit and improving driver safety.

[0005] In order to achieve these objectives and other advantages according to the present invention, a loading step for off-highway dump trucks is provided, including a first-level step, a second-level step, and a third-level step;

[0006] The first-level step and the second-level step are connected by a canvas strap;

[0007] The secondary step includes a foot pedal and a pair of connecting members. The pair of connecting members are respectively disposed at both ends of the foot pedal along its length direction. The connecting member includes a foot pedal connecting plate, a pair of hinges arranged at different heights, a connecting plate, and a first fixing plate. The foot pedal connecting plate is connected to the side wall of the foot pedal. The axial direction of the hinge is consistent with the width direction of the foot pedal. The first connecting part of the lower hinge is connected to the foot pedal connecting plate. The bottom and top of the connecting plate are respectively connected to the second connecting parts of the pair of hinges, so that the connecting plate can rotate around the axial direction of the hinge. The first fixing plate is provided on the first connecting part of the higher hinge.

[0008] The three steps are connected to the first fixed plate.

[0009] Preferably, the hinge includes a hinge shaft, a first hinge sleeve, a pair of second hinge sleeves, and a cotter pin. The first hinge sleeve, the second hinge sleeve, and the hinge shaft are aligned axially. The pair of second hinge sleeves are respectively disposed on both sides of the first hinge sleeve along its axial direction. One end of the hinge shaft passes through one second hinge sleeve, the first hinge sleeve, and the other second hinge sleeve in sequence. Both ends of the hinge shaft are located outside the pair of second hinge sleeves. A pin hole is provided on one end of the hinge shaft, and the cotter pin passes through the pin hole. An anti-detachment boss is provided on the other end of the hinge shaft. The hinge shaft is interference-fitted with the first hinge sleeve, and clearance-fitted with the second hinge sleeve.

[0010] Wherein, the first hinge chin sleeve is the first connecting part, and the second hinge chin sleeve is the second connecting part; the first chin sleeve has a first groove along its axial direction, and the second chin sleeve has a second groove along its axial direction; the foot pedal connecting plate and the first fixing plate are both provided with a first protrusion that matches the first groove at the corresponding position of the first groove; and the top and bottom ends of the connecting plate are both provided with a second protrusion that matches the corresponding second groove.

[0011] Preferably, the hinge at the top is provided with an inclined limiting plate, the bottom end of which is inclined toward the connecting plate, and the angle between the limiting plate and the vertical direction is 15~45°.

[0012] Preferably, the foot pedal includes a first C-shaped bending plate, and a plurality of reinforcing plates are provided between the two oriented ends of the first C-shaped bending plate, the top of the reinforcing plates being toothed.

[0013] Preferably, the canvas straps are in pairs;

[0014] The first step includes a second C-shaped bending plate and a pair of second fixing plates. The pair of second fixing plates are respectively located at the C-shaped ends of the C-shaped bending plate. A pair of canvas straps are respectively located on the outside of the pair of second fixing plates. Pressure plates are provided near the top and near the bottom of the canvas straps on the side away from the second fixing plates. The pressure plate located at the lower position is connected to the corresponding second fixing plate by bolts, and the pressure plate located at the higher position is connected to the corresponding foot pedal connecting plate by bolts.

[0015] Preferably, a first weight-reducing groove is formed in the middle of the second C-shaped bending plate, and a first anti-slip plate is covered on the first weight-reducing groove. The top of the first anti-slip plate has a plurality of round holes with raised edges.

[0016] Preferably, the three-stage step includes a step frame, a pair of connecting bending plates, and a step skin;

[0017] The step frame has a vertical box-like structure. A pair of connecting bent plates are respectively located at the bottom of both ends of the step frame along its length direction. The pair of connecting bent plates are respectively connected to a pair of first fixing plates. Trapezoidal grooves are provided on the front and rear side walls of the step frame.

[0018] The step skin is a C-shaped plate with a concave center. The concave part of the step skin is adapted to a pair of trapezoidal grooves so that the concave part of the step skin is inserted into the pair of trapezoidal grooves. At this time, the top of the step skin covers the top of the step frame and the bottom of the step skin covers the bottom of the step frame.

[0019] Preferably, the recessed part of the step skin forms a groove; the top and bottom of the step frame are provided with a second weight-reducing groove, and the top of the step skin and the inner bottom wall of the groove are provided with a second anti-slip plate, which is provided with a plurality of round holes with raised edges.

[0020] Preferably, the step frame includes a third C-shaped bending plate and a fourth C-shaped bending plate, which are fastened and fixed together to form the box-like structure. One end face of the step frame along its length is provided with vertically arranged support plates, which extend to the front end of the step frame. Triangular ribs connect the support plates to the front side wall of the step frame.

[0021] Off-highway dump trucks, including the aforementioned off-highway dump truck loading steps.

[0022] This utility model has at least the following beneficial effects:

[0023] By designing a primary step, secondary step, tertiary step, canvas belt, foot pedal, foot pedal connecting plate, hinge, connecting plate, and first fixing plate, a non-highway dump truck loading step is provided. The connection between the secondary and tertiary steps is designed with a margin of safety. When encountering obstacles, this margin of safety can reduce the strong rigid contact between the obstacle and the secondary and tertiary steps, thus mitigating wear and deformation. This ensures that the structure of the secondary and tertiary steps remains as intact as possible, facilitating driver entry and exit and improving driver safety.

[0024] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the structure of the loading steps for an off-highway dump truck according to one of the technical solutions of this utility model;

[0026] Figure 2 This is a schematic diagram of the structure of the two-stage step according to one of the technical solutions of this utility model;

[0027] Figure 3 This is a schematic diagram of the upper hinge structure according to one of the technical solutions of this utility model;

[0028] Figure 4 This is a schematic diagram of the structure of the lower hinge according to one of the technical solutions of this utility model;

[0029] Figure 5 This is a schematic diagram of the foot pedal according to one of the technical solutions of this utility model;

[0030] Figure 6 This is a schematic diagram of the structure of the first step and a pair of canvas belts according to one of the technical solutions of this utility model;

[0031] Figure 7 This is a schematic diagram of the structure of the first-stage step according to one of the technical solutions of this utility model;

[0032] Figure 8 This is a schematic diagram of the three-step structure according to one of the technical solutions of this utility model;

[0033] Figure 9 This is a schematic diagram of the structure of the third C-shaped bending plate and the fourth C-shaped bending plate according to one of the technical solutions of this utility model;

[0034] Figure 10 This is a schematic diagram of the structure of the step frame according to one of the technical solutions of this utility model;

[0035] Figure 11 This is a schematic diagram of the structure of the step skin according to one of the technical solutions of this utility model.

[0036] Attached reference numerals: 1-First step; 2-First anti-slip plate; 3-Canvas belt; 4-Pressure plate; 5-Second fixing plate; 6-Second C-shaped bending plate; 7-Upper hinge; 8-Lower hinge; 9-Foot pedal; 10-Foot pedal connecting plate; 11-Connecting plate; 12-First fixing plate; 13-Cotter pin; 14-Jaw sleeve two; 15-Jaw sleeve one; 16-Limiting plate; 17-Jaw axis; 18-First C-shaped bending plate; 19-Reinforcing plate; 20-Step frame; 22-Triangular rib; 23-Support plate; 24-Third C-shaped bending plate; 25-Connecting bending plate; 26-Fourth C-shaped bending plate; 28-Step cover; 29-Upper anti-slip plate; 30-Lower anti-slip plate. Detailed Implementation

[0037] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0038] It should be understood that terms such as “having,” “comprising,” and “including” as used herein do not exclude the presence or addition of one or more other elements or combinations thereof.

[0039] like Figure 1-11 As shown, this utility model provides a loading step for off-highway dump trucks, including a primary step 1, a secondary step, and a tertiary step;

[0040] The first-level step 1 and the second-level step are connected by a canvas strap 3;

[0041] The secondary step includes a foot pedal 9 and a pair of connecting members. The pair of connecting members are respectively disposed at both ends of the foot pedal 9 along its length direction. The connecting members include a foot pedal connecting plate 10, a pair of hinges arranged at different heights, a connecting plate 11, and a first fixing plate 12. The foot pedal connecting plate 10 is connected to the side wall of the foot pedal 9. The axial direction of the hinge is consistent with the width direction of the foot pedal 9. The first connecting part of the lower hinge is connected to the foot pedal connecting plate 10. The bottom and top of the connecting plate 11 are respectively connected to the second connecting parts of the pair of hinges, so that the connecting plate 11 can rotate around the hinge axial direction. The first fixing plate 12 is provided on the first connecting part of the higher hinge.

[0042] The three-step system is connected to the first fixed plate 12;

[0043] In the above technical solution, the loading steps of the off-highway dump truck include a first-level step 1, a second-level step and a third-level step, and the first-level step 1 and the second-level step are flexibly connected by two canvas belts 3.

[0044] The secondary step includes a foot pedal 9 and a pair of symmetrically arranged connectors, located on opposite sides of the foot pedal 9 along its length. Each connector consists of a foot pedal connecting plate 10, two hinges at different heights, a connecting plate 11, and a first fixing plate 12. The pair of hinges have identical structures, with their axial direction parallel to the width direction of the foot pedal 9. The first connecting portion of the lower hinge connects to the top of the foot pedal connecting plate 10. The connecting plate 11 is positioned between the two hinges, with its bottom connecting to the second connecting portion of the lower hinge and its top connecting to the second connecting portion of the upper hinge, allowing the connecting plate 11 to rotate around the hinge axis. The first fixing plate 12 connects to the first connecting portion of the upper hinge. The tertiary step is fixedly connected to the pair of first fixing plates 12 by bolts. The hinge can be a common hinge on the market. Commonly used hinges on the market usually have a first connecting part and a second connecting part. The first connecting part refers to the connecting part that is interference-fitted with the axis of the hinge, and the second connecting part refers to the part that can rotate around the axis of the hinge. This is the prior art and will not be described in detail here.

[0045] In this technical solution, during use, when the secondary or tertiary step is impacted by an obstacle, the impact force is transmitted to the higher hinge through the first fixed plate 12, driving the connecting plate 11 to rotate around the hinge axis. Simultaneously, this causes the lower hinge and the secondary step as a whole to undergo adaptive deflection. During this process, the hinge clearance fit structure allows the connecting plate 11 to undergo horizontal displacement, creating a flexible buffer between the obstacle and the secondary / tertiary step. After the impact is eliminated, the connecting plate 11 returns to its initial position under the action of gravity.

[0046] The beneficial effects of this technical solution are that the hinged connection between the secondary and tertiary steps forms a flexible buffer structure. Upon impact with an obstacle, stress is dispersed through rotational displacement, reducing the risk of deformation of the secondary and tertiary steps. Compared to traditional bolted connections, this structure reduces deformation of the secondary and tertiary steps due to collisions with obstacles, extending their service life. Simultaneously, it preserves the original structural integrity of the secondary and tertiary steps as much as possible, facilitating driver entry and exit and improving driver safety.

[0047] In another technical solution, the hinge includes a chin shaft 17, a first chin sleeve 15, a pair of second chin sleeves 14, and a cotter pin 13. The first chin sleeve 15, the second chin sleeve 14, and the chin shaft 17 are aligned axially. The pair of second chin sleeves 14 are respectively disposed on both sides of the first chin sleeve 15 along its axial direction. One end of the chin shaft 17 passes through one second chin sleeve 14 and the other second chin sleeve 14 of the first chin sleeve 15 in sequence. The two ends of the chin shaft 17 are respectively located outside the pair of second chin sleeves 14. A pin hole is provided on one end of the chin shaft 17, and the cotter pin 13 passes through the pin hole. An anti-detachment boss is provided on the other end of the chin shaft 17. The chin shaft 17 is interference-fitted with the first chin sleeve 15, and the chin shaft 17 is clearance-fitted with the second chin sleeve 14.

[0048] Wherein, the first hinge sleeve 15 is the first connecting part, and the pair of second hinge sleeves 14 are the second connecting parts; the first hinge sleeve 15 has a first groove along its axial direction, and the second hinge sleeve 14 has a second groove along its axial direction; the foot pedal connecting plate 10 and the first fixing plate 12 are both provided with a first protrusion that matches the first groove at the corresponding position; and the top and bottom ends of the connecting plate 11 are both provided with a second protrusion that matches the corresponding second groove.

[0049] In the above technical solution, the hinge includes a jaw shaft 17, a jaw sleeve 15, a pair of jaw sleeves 14, and a cotter pin 13. Both the jaw sleeve 15 and the jaw sleeves 14 are tubular structures. One end of the jaw shaft 17 passes sequentially through one jaw sleeve 14, one jaw sleeve 15, and another jaw sleeve 14. Both ends of the jaw shaft 17 are located outside the pair of jaw sleeves 14. One end of the jaw shaft 17 is machined with a boss to prevent the jaw shaft 17 from falling off. The other end of the jaw shaft 17 is machined with a pin hole equipped with a matching cotter pin 13, also used to prevent the jaw shaft 17 from falling off and to facilitate hinge removal from this end. The jaw sleeve 14 is an interference fit with the jaw shaft 17, while the jaw sleeve 15 is a clearance fit with the jaw shaft 17. During installation, the jaw sleeves 14, 15, and another jaw sleeve 14 can be inserted sequentially from the end without the boss, so that the jaw sleeve 15 is an interference fit with the jaw shaft 17 (interference amount 0.05mm), and the jaw sleeve 14 is a clearance fit with the jaw shaft 17 (clearance 0.1-0.3mm). Finally, the cotter pin 13 is inserted into the pin hole.

[0050] In this design, a pair of hinge sleeves 14 form a second connecting portion, and a hinge sleeve 15 forms a first connecting portion. A first groove is formed along the axial direction at the bottom of the hinge sleeve 15 located at the lower position. A first protrusion is formed at the corresponding position on the top of the foot pedal connecting plate 10. The first protrusion matches the first groove so that when the first protrusion is engaged in the first groove, the foot pedal connecting plate 10 connects to the first connecting portion of the lower hinge. The connecting plate 11 is vertically arranged, and second protrusions are provided at both ends of the top and bottom of the connecting plate 11 along the width direction of the foot pedal 9. The structure of the connecting plate 11 is similar to an H-shape. A pair of hinge sleeves 14 on each hinge have a second groove formed along their axial direction. The four second grooves correspond one-to-one with the four second protrusions on the corresponding connecting plate 11. When the second protrusion is engaged in the corresponding second groove, the connecting plate 11 connects to the second connecting portion of the hinge, allowing the connecting plate 11 to rotate around the hinge axis, providing a margin of movement.

[0051] In this technical solution, during use, when the connecting plate 11 is deflected by force, the second jaw sleeve 14 rotates around the jaw shaft 17. The clearance fit allows radial floating, reducing frictional resistance. The concave-convex interlocking structure (protrusion and groove) withstands shear loads, preventing circumferential slippage of the hinge. Under extreme conditions, the interference fit of the first jaw sleeve 15 and the jaw shaft 17 maintains rigid transmission, while the clearance fit of the second jaw sleeve 14 allows for slight floating to avoid jamming. The cotter pin 13 and the anti-disengagement boss form a double axial limit, ensuring that the jaw shaft 17 does not come out. During maintenance, the jaw shaft 17 can be disassembled simply by pulling out the cotter pin 13, facilitating the replacement of worn parts.

[0052] The beneficial effects of adopting this technical solution are that by designing the jaw sleeve 15, jaw shaft 17, jaw sleeve 2 14, cotter pin 13, first groove, and second groove, a hinge structure is provided, which is more suitable for connection with the connecting plate 11 in this device. At the same time, the modular assembly method facilitates the individual replacement of worn jaw sleeves or jaw shafts 17, reducing maintenance costs.

[0053] In another technical solution, the hinge 15 located at the upper position has an inclined limiting plate 16. The bottom end of the limiting plate 16 is inclined towards the connecting plate 11. When the connecting plate 11 rotates to contact the limiting plate 16, the angle between the connecting plate 11 and the vertical direction is 15~45°. Specifically, as shown in the figure, the hinge located at the upper position is the upper hinge 7, and the hinge located at the lower position is the lower hinge 8. Each pair of upper hinges 7 has a limiting plate 16 on its chin sleeve 15. The limiting plate 16 is located on the side of the connecting plate 11 away from the foot pedal 9. The limiting plate 16 is inclined, and the upper end of the limiting plate 16 is connected to the chin sleeve 15. The lower end of 6 is tilted towards the connecting plate 11. The design position of the limiting plate 16 is such that when the connecting plate 11 rotates to contact the limiting plate 16, the angle between the connecting plate 11 and the vertical direction is 15~45°, preferably 30 degrees. This design has two advantages: first, the tilted limiting plate 16 provides a mechanical hard limit under extreme working conditions to prevent the connecting plate 11 from rotating beyond its limit and causing damage to the hinge structure; second, the preferred 30-degree angle design can avoid the situation where the angle is too small, resulting in a small margin of movement and inability to effectively avoid obstacles; on the other hand, it can also avoid the situation where the angle is too large, resulting in a large margin of movement and causing instability when the driver gets into the vehicle, thus creating a safety hazard.

[0054] In another technical solution, the foot pedal 9 includes a first C-shaped bending plate 18, with multiple reinforcing plates 19 spaced apart between the two unidirectional ends of the first C-shaped bending plate 18. The top of the reinforcing plates 19 is serrated. Specifically, the foot pedal 9 includes a first C-shaped bending plate 18, which is horizontally arranged, with multiple reinforcing plates 19 vertically connected between its unidirectional ends. The multiple reinforcing plates 19 are spaced apart along the width direction of the first C-shaped plate, and the top of the multiple reinforcing plates 19 is designed to be serrated. Furthermore, the top of the portion of the first C-shaped bending plate 18 parallel to the reinforcing plates 19 can also be designed to be serrated. The serrated structure is used for anti-slip and has strong practicality.

[0055] In another technical solution, the canvas strips 3 are a pair;

[0056] The first step 1 includes a second C-shaped bending plate 6 and a pair of second fixing plates 5. The pair of second fixing plates 5 are respectively disposed at the C-shaped ends of the C-shaped bending plate. A pair of canvas straps 3 are respectively disposed on the outside of the pair of second fixing plates 5. Pressure plates 4 are provided on the side of the canvas straps 3 away from the second fixing plates 5 near the top and near the bottom. The pressure plate 4 located at the lower position is connected to the corresponding second fixing plate 5 by bolts, and the pressure plate 4 located at the higher position is connected to the corresponding foot pedal connecting plate 10 by bolts.

[0057] In the above technical solution, the canvas straps 3 are in pairs, with one pair of canvas straps 3 positioned on each side of the first-level step 1. The first-level step 1 includes a second C-shaped bending plate 6 and a pair of second fixing plates 5. The second C-shaped bending plate 6 is inverted, and a second fixing plate 5 is matched at each of the two C-shaped ends. The canvas straps 3 are located outside the second fixing plates 5. Pressure plates 4 are provided on the lower part near the bottom end and the upper part near the top end of the canvas straps 3. The pressure plates 4 are located on the side of the canvas straps 3 away from the second fixing plates 5. The lower pressure plate 4 is connected to the second fixing plate 5 by bolts, and the upper pressure plate 4 is connected to the foot pedal connecting plate 10 by bolts. It should be noted that in actual use, one end of the foot pedal connecting plate 10 along its width direction is connected to the corresponding pressure plate 4, and the other end is connected to the corresponding hinge jaw 15. This design conforms to the habit of stepping and is highly practical.

[0058] The advantages of this technical solution are that the double canvas belt 3 design enables flexible suspension of the first-stage step 1, preventing the rigid connecting parts from breaking under bumpy conditions. The bolted connection of the pressure plate 4 facilitates the individual replacement of the canvas belt 3, eliminating the need to disassemble the main step structure for maintenance. The overall layout saves space and is suitable for the compact installation environment of off-highway dump vehicle chassis.

[0059] In another technical solution, a first weight-reducing groove is formed in the middle of the second C-shaped bending plate 6, and a first anti-slip plate 2 is covered on the first weight-reducing groove. The top of the first anti-slip plate 2 has a plurality of round holes with raised edges for anti-slip purposes. Specifically, the second C-shaped bending plate 6 has a first weight-reducing groove in the middle, and the two ends of the first anti-slip plate 2 are bent to match and cover the first weight-reducing groove. The first anti-slip plate 2 has a plurality of round holes with raised edges, so as to reduce the weight of the first step 1 while having an anti-slip effect.

[0060] In another technical solution, the three-stage step includes a step frame 20, a pair of connecting bending plates 25, and a step skin 28;

[0061] The step frame 20 has a vertical box-like structure. A pair of connecting bent plates 25 are respectively disposed at the bottom of both ends of the step frame 20 along its length direction. The pair of connecting bent plates 25 are respectively connected to a pair of first fixing plates 12. Trapezoidal grooves are provided on the front and rear side walls of the step frame 20.

[0062] The step skin 28 is a C-shaped plate with a concave center. The concave part of the step skin 28 is adapted to a pair of trapezoidal grooves so that the concave part of the step skin 28 is inserted into the pair of trapezoidal grooves. At this time, the top of the step skin 28 covers the top of the step frame 20, and the bottom of the step skin 28 covers the bottom of the step frame 20.

[0063] In the above technical solution, the three-stage step consists of a step frame 20, a step skin 28, and a pair of connecting bent plates 25. The step frame 20 is vertically arranged and has a box-like structure, with trapezoidal grooves stamped in the center of the front and rear side walls. The connecting bent plates 25 are welded to the bottom ends of the box-like structure, and the pair of connecting bent plates 25 are connected to the first fixing plate 12 of the second-stage step by bolts.

[0064] The step cover 28 is a C-shaped bent plate. The shape of the step cover 28 is adapted to the shape of the step frame 20. The center of the step cover 28 is concave to form a groove, which is adapted to the trapezoidal groove so that when the step cover 28 is placed on the step frame 20, the groove is matched and inserted into a pair of trapezoidal grooves. During assembly, the concave part of the step cover is aligned with the trapezoidal groove of the frame and inserted, so that the top of the step cover covers the tread surface of the step frame 20 and the bottom of the step cover covers the bottom surface of the step frame 20, forming a fully enclosed tread surface structure.

[0065] In this technical solution, when the driver steps on the pedal, the concave part of the step skin 28 engages with the trapezoidal groove to withstand the vertical force, preventing the step skin 28 from slipping relative to the step frame 20; the horizontal sections at the top / bottom of the step skin 28 generate friction with the contact surface of the step frame 20 to resist torsional loads. When encountering a lateral impact from an obstacle, the step frame 20 constrains the displacement of the step skin 28 through the trapezoidal groove, and a pair of connecting bending plates 25 disperse the impact force to the secondary step connector.

[0066] The beneficial effects of adopting this technical solution are that the box-shaped structure of the step frame 20 provides high bending stiffness, the detachable design of the step skin 28 facilitates the replacement of worn parts, and maintenance only requires pulling out the step skin 28 to expose the internal structure of the step frame 20. The fully enclosed tread surface prevents mud and water from seeping into the frame cavity, reducing the risk of corrosion.

[0067] In another technical solution, a groove is formed in the concave part of the step skin; a second weight-reducing groove is opened at the top and bottom of the step frame 20; a second anti-slip plate is provided on the top of the step skin and the inner bottom wall of the groove; the second anti-slip plate is provided with a plurality of round holes with raised edges for anti-slip purposes.

[0068] In the above technical solution, the top and bottom of the step frame 20 are respectively provided with second weight-reducing grooves. The second weight-reducing groove at the top is located in the central area of ​​the tread surface, and the second weight-reducing grooves at the bottom are symmetrically arranged. A groove is formed in the concave part of the step skin 28, and a second anti-slip plate is laid on the inner bottom wall of the groove. This second anti-slip plate is the lower anti-slip plate 30. The top tread surface area of ​​the step skin is also laid with a second anti-slip plate of the same specification, which is the upper anti-slip plate 29. Both the upper anti-slip plate 29 and the lower anti-slip plate 30 are provided with multiple round holes with raised edges to prevent slipping. During assembly, the upper anti-slip plate 29 and the lower anti-slip plate 30 are first fixed to the corresponding positions of the step skin 28 by welding or screwing. Then, the step skin 28 is fastened to the step frame 20. At this time, the plate of the step skin 28 where the upper anti-slip plate 29 is located covers the second weight-reducing groove at the top of the step frame 20, and the plate of the step skin 28 where the lower anti-slip plate 30 is located covers the second weight-reducing groove at the bottom, which is more aesthetically pleasing.

[0069] The beneficial effects of adopting this technical solution are that by designing a pair of second anti-slip plates, the anti-slip requirements of both the main tread surface and the groove are taken into account; the second weight-reducing groove realizes the lightweighting of the step frame 20 while avoiding the loss of rigidity caused by overall thinning.

[0070] In another technical solution, the step frame 20 includes a third C-shaped bending plate 24 and a fourth C-shaped bending plate 26. The third C-shaped bending plate 24 and the fourth C-shaped bending plate 26 are fastened and fixed to form the box-like structure. One end face of the step frame 20 along its length is provided with vertically arranged support plates 23. The support plates 23 extend to the front end of the step frame 20. A triangular rib 22 is connected between the support plates 23 and the front side wall of the step frame 20.

[0071] In the above technical solution, the step frame 20 is composed of a third C-shaped bending plate 24 and a fourth C-shaped bending plate 26 fastened together. After the third C-shaped bending plate 24 and the fourth C-shaped bending plate 26 are fastened together, they are fully welded along the contact edge to form a box-like structure. At one end face of the step frame 20 along its length (e.g....) Figure 10 The left end face of the step frame 20 is welded with two support plates 23 arranged vertically. The front ends of the support plates 23 extend beyond the step frame 20. Each support plate 23 is connected to the front side wall of the step frame 20 (e.g., the left end face of the step frame 20). Figure 10 Triangular ribs 22 are welded between the front side wall of the third C-shaped bending plate 24 in the middle. The two sides of the triangular ribs 22 are respectively welded to the lower surface of the support plate 23 and the outer surface of the front side wall of the step frame 20, and the inclined side provides reinforcement support.

[0072] The beneficial effects of adopting this technical solution are that, by designing the support plate 23 and the triangular rib 22, the connection strength of the third C-shaped bending plate 24 and the fourth C-shaped bending plate 26 is further improved. At the same time, the design of the third C-shaped bending plate 24, the fourth C-shaped bending plate 26, the support plate 23, and the triangular rib 22 facilitates the on-site assembly of the step frame 20, making it highly practical.

[0073] This utility model also provides an off-highway dump truck, which includes a loading step. The off-highway dump truck equipped with the loading step has a connection between the second and third steps designed with a margin of safety. When encountering an obstacle, this margin prevents strong rigid contact between the obstacle and the connecting parts between the second and third steps, thus reducing wear and deformation caused by rigid contact. This facilitates driver entry and exit, improving driver safety.

[0074] The number of devices and processing scale described herein are for the purpose of simplifying the description of this utility model. Applications, modifications, and variations of the off-highway dump truck loading steps of this utility model will be readily apparent to those skilled in the art.

[0075] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A loading step for an off-highway dump truck, characterized in that, Including level 1 steps, level 2 steps, and level 3 steps; The first-level step and the second-level step are connected by a canvas strap; The secondary step includes a foot pedal and a pair of connecting members. The pair of connecting members are respectively disposed at both ends of the foot pedal along its length direction. The connecting member includes a foot pedal connecting plate, a pair of hinges arranged at different heights, a connecting plate, and a first fixing plate. The foot pedal connecting plate is connected to the side wall of the foot pedal. The axial direction of the hinge is consistent with the width direction of the foot pedal. The first connecting part of the lower hinge is connected to the foot pedal connecting plate. The bottom and top of the connecting plate are respectively connected to the second connecting parts of the pair of hinges, so that the connecting plate can rotate around the axial direction of the hinge. The first fixing plate is provided on the first connecting part of the higher hinge. The three steps are connected to the first fixed plate.

2. The off-highway dump truck loading step as described in claim 1, characterized in that, The hinge includes a hinge shaft, a first hinge sleeve, a pair of second hinge sleeves, and a cotter pin. The first hinge sleeve, the second hinge sleeve, and the hinge shaft are aligned axially. The pair of second hinge sleeves are located on both sides of the first hinge sleeve along its axial direction. One end of the hinge shaft passes sequentially through one second hinge sleeve, the first hinge sleeve, and the other second hinge sleeve. Both ends of the hinge shaft are located outside the pair of second hinge sleeves. A pin hole is provided on one end of the hinge shaft, and the cotter pin passes through the pin hole. An anti-detachment boss is provided on the other end of the hinge shaft. The hinge shaft is interference-fitted with the first hinge sleeve, and clearance-fitted with the second hinge sleeve. Wherein, the first hinge chin sleeve is the first connecting part, and the second hinge chin sleeve is the second connecting part; the first chin sleeve has a first groove along its axial direction, and the second chin sleeve has a second groove along its axial direction; the foot pedal connecting plate and the first fixing plate are both provided with a first protrusion that matches the first groove at the corresponding position of the first groove; and the top and bottom ends of the connecting plate are both provided with a second protrusion that matches the corresponding second groove.

3. The off-highway dump truck loading step as described in claim 2, characterized in that, An inclined limiting plate is provided on the chin sleeve of the hinge located at a high position. The bottom end of the limiting plate is inclined toward the connecting plate. When the connecting plate rotates to contact the limiting plate, the angle between the connecting plate and the vertical direction is 15~45°.

4. The off-highway dump truck loading step as described in claim 1, characterized in that, The foot pedal includes a first C-shaped bending plate, and a plurality of reinforcing plates are spaced apart between the two unidirectional ends of the first C-shaped bending plate. The top of the reinforcing plates is toothed.

5. The off-highway dump truck loading step as described in claim 1, characterized in that, The canvas straps are in pairs; The first step includes a second C-shaped bending plate and a pair of second fixing plates. The pair of second fixing plates are respectively located at the C-shaped ends of the C-shaped bending plate. The pair of canvas straps are respectively located on the outside of the pair of second fixing plates. Pressure plates are provided near the top and near the bottom of the canvas straps on the side away from the second fixing plates. The pressure plate located at the lower position is connected to the corresponding second fixing plate by bolts, and the pressure plate located at the higher position is connected to the corresponding foot pedal connecting plate by bolts.

6. The off-highway dump truck loading step as described in claim 5, characterized in that, The second C-shaped bending plate has a first weight-reducing groove in the middle, and the first weight-reducing groove is covered with a first anti-slip plate. The top of the first anti-slip plate has multiple round holes with raised edges.

7. The off-highway dump truck loading step as described in claim 1, characterized in that, The three-stage step includes a step frame, a pair of connecting bending plates, and a step skin; The step frame has a vertical box-like structure. The pair of connecting bent plates are respectively located at the bottom of both ends of the step frame along its length direction. The pair of connecting bent plates are respectively connected to a pair of first fixing plates. Trapezoidal grooves are provided on the front and rear side walls of the step frame. The step skin is a C-shaped plate with a concave center. The concave part of the step skin is adapted to a pair of trapezoidal grooves so that the concave part of the step skin is inserted into the pair of trapezoidal grooves. The top of the step skin covers the top of the step frame, and the bottom of the step skin covers the bottom of the step frame.

8. The off-highway dump truck loading step as described in claim 7, characterized in that, The recessed part of the step skin forms a groove; the top and bottom of the step frame are provided with a second weight-reducing groove; the top of the step skin and the inner bottom wall of the groove are provided with a second anti-slip plate; the second anti-slip plate is provided with a plurality of round holes with raised edges.

9. The off-highway dump truck loading step as described in claim 8, characterized in that, The step frame includes a third C-shaped bending plate and a fourth C-shaped bending plate. The third C-shaped bending plate and the fourth C-shaped bending plate are fastened and fixed together to form the box-like structure. One end face of the step frame along its length is provided with vertically arranged support plates. The support plates extend to the front end of the step frame. Triangular ribs connect the support plates to the front side wall of the step frame.

10. An off-highway dump truck, characterized in that, Includes the off-highway dump truck loading steps as described in any one of claims 1 to 9.

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