Steering mechanism of mining dump truck

Abstract

The utility model provides a mining dump truck steering mechanism which comprises a front axle steering assembly and a hydraulic system and further comprises a rear wheel steering assembly arranged on a rear axle, the rear wheel steering assembly comprises a rear steering knuckle and a rear steering driving mechanism, and the rear steering driving mechanism is hinged to the rear steering knuckle. The two ends of the rear axle are connected with the rear knuckle through a steering fork, and a transmission universal shaft in power connection with the rear axle driving shaft and the rear brake drum is arranged in the middle of the steering fork. The rear steering driving mechanism serves as a power source for steering of the rear wheels, the transmission universal shaft penetrating through one end of the steering fork and connected with the rear axle driving shaft through the spline is arranged in the middle of the steering fork, connected with the rear brake drum, of the rear axle, and the steering function is added while transmission is achieved. The rear steering driving mechanism is hinged to the rear steering knuckle, so that steering of the rear wheels is achieved instead of rotation of the rear axle, abrasion of the rear wheels during steering can be greatly reduced, and the service life of tires is prolonged.

Description

Technical Field

[0001] The utility model relates to a steering mechanism of a mining dump truck, belonging to the technical field of vehicle steering. Background Art

[0002] Mining transport vehicles are one of the main material transportation equipment in the mining process. The mining environment is harsh, and there are many slopes and turns on the transportation route. Mining dump trucks are multi-bridge transport vehicles. In such an environment with many turns, the large turning radius of the vehicle will cause inconvenience in turning.

[0003] There is an existing Chinese published patent CN116080790A for a dump truck. The application discloses a technical solution including "the first drive assembly is connected to the second axle and the third axle to enable the dump truck to obtain sufficient driving force, and the fourth axle is connected to the frame by rotating the frame, so that the fourth axle has a steering function. Such an arrangement can reduce the turning radius of the vehicle and improve the vehicle's adaptability to mining areas." It can be seen that the application provides a steering function for the fourth axle by rotating the connection between the frame and the fourth axle. However, steering by rotating the frame structure will cause local wear on the vehicle tires, and mining dump trucks are mostly equipped with pairs of wheels on both sides of the axle. Steering by pushing and pulling the axle in a harsh working environment will increase the possibility of vehicle tire failure.

[0004] Therefore, under the premise of ensuring the vehicle load, it is an urgent problem to improve the rear axle steering structure of the mining dump truck and reduce the friction between the rear axle tires and the ground when turning to increase the tire service life. Summary of the Invention

[0005] Purpose of the invention: In view of the deficiencies in the prior art, the present invention provides a steering mechanism for a mining dump truck. By providing a clamp-type half-axle, a rear steering hitch and a transmission universal joint, it provides transmission for the rear axle of the vehicle while providing the rotation function of the transmission universal joint, thereby realizing the steering of the rear wheels, reducing the friction distance between the tire and the ground, and improving the service life of the tire.

[0006] Technical solution: A steering mechanism for a mining dump truck includes a front axle steering assembly and a hydraulic system, and also includes a rear wheel steering assembly provided on the rear axle. The rear wheel steering assembly includes a rear steering hitch rotatably connected to the rear brake drum via a bearing, and a rear steering drive mechanism provided on the rear axle. The rear steering drive mechanism is hinged to the rear steering hitches on both sides and connected to the hydraulic system.

[0007] The two ends of the rear axle are connected to the rear steering knot through a clamp-shaped half-shaft. The clamp-shaped half-shaft is fixedly connected to the rear axle at one end close to the rear axle, and is hinged to the rear steering knot at one end close to the rear brake drum. A transmission universal joint is provided in the middle of the clamp-shaped half-shaft, which is dynamically connected to the rear axle drive shaft and the rear brake drum.

[0008] The utility model provides a rear steering drive mechanism as a power source for rear wheel steering, and provides a transmission universal joint penetrating one end of the clamp half-shaft connected to the rear axle and the rear brake drum in the middle of the clamp half-shaft connected to the rear axle and the rear brake drum, thereby increasing the steering function while realizing transmission, and realizing steering of the rear wheels rather than rotation of the rear axle through the articulation of the rear steering drive mechanism and the rear steering knot, which can greatly reduce the wear of the rear wheels during steering and improve the service life of the tires. At the same time, the method of rotating the rear wheels is more labor-saving than the method of rotating the entire axle, and has lower requirements for the hydraulic system. Therefore, the cost control of the hydraulic system can be controlled within a lower cost range, thereby reducing the manufacturing cost of the entire vehicle; the steering angle is also larger than the steering angle of the push axle, and the steering speed is faster, which reduces the turning radius of the mining vehicle during steering, and is more suitable for mining environments with poor road conditions and narrow roads.

[0009] It also includes a controller assembly for receiving and sending signals, which is connected to the hydraulic system signal. The front axle steering assembly includes a front steering knot rotatably connected to the front brake drum through a bearing and a front steering drive mechanism arranged on the front axle. The front steering drive mechanism is hinged to the front steering knots on both sides and connected to the hydraulic system. The front steering knot is hinged to both ends of the front axle, and a front angle sensor is installed at the hinge. The front angle sensor is connected to the controller assembly signal.

[0010] In order to improve the reaction speed when the rear wheels are turned and improve the synchronization between the front and rear wheels, a front angle sensor is set at the front wheel steering position. By collecting the changes in the front angle sensor and feeding them back to the controller assembly, the controller assembly directly sends instructions to the hydraulic system at the rear axle end. Compared with the traditional hydraulic system that connects the front and rear axles through pipelines, this method reduces the time for partial oil transmission, shortens the reaction time of the rear wheel steering, and improves the synchronization of the front and rear wheel steering.

[0011] A front tie rod arm is provided on one side of the front steering knot, and the front steering drive mechanism includes front steering power cylinders provided at both ends on the same side of the front axle, the two ends of the front steering power cylinder are respectively hinged to the front axle and the middle part of the front tie rod arm, the front tie rod arms on both sides are connected through a front tie rod, the two ends of the front tie rod are respectively hinged to the ends of the front tie rod arms on both sides, and the front steering power cylinder is connected to the hydraulic system.

[0012] By setting up a single front tie rod arm and setting a hinge hole in the middle to which the front steering power cylinder is hinged, since the front axle needs to bear relatively less weight, the front steering power cylinder is hinged in the middle of the front tie rod arm to ensure sufficient strength for steering, thereby reducing the production and manufacturing costs of the front steering joint.

[0013] The front steering joint is provided with a front rotating arm and a front transverse tie rod arm arranged in parallel up and down on the same side. The front steering drive mechanism includes a front steering power cylinder arranged at both ends on the same side of the front axle. The two ends of the front steering power cylinder are respectively hinged to the front axle and the front rotating arm. The front transverse tie rod arms on both sides are connected through a front transverse tie rod. The two ends of the front transverse tie rod are respectively hinged to the ends of the front transverse tie rod arms on both sides. The front steering power cylinder is connected to the hydraulic system.

[0014] When it is applied to vehicles with larger tonnage, the positive pressure borne by the front wheels increases. When the front wheels are turned, the two steering power cylinders are filled with oil into different cavities at the same time through the cooperation of the front steering power cylinder, pushing and pulling at the same time to provide steering force, and the tie rod is used to overcome the hydraulic hysteresis or slight flow non-uniformity that causes the steering speed of the tires on both sides to be inconsistent. When in action, the steering direction of the front axle is opposite to that of the rear axle. If the front steering drive mechanism and the rear steering drive mechanism are installed on the same side, the positions of the steering power cylinders for pushing out the front and rear axles are opposite when in action; if the front steering drive mechanism and the rear steering drive mechanism are installed on different sides, the positions of the steering power cylinders for pushing out the front and rear axles are at the same end when in action, thereby realizing rear-wheel steering and reducing the turning radius.

[0015] The rear steering joint is provided with a rear rotating arm and a rear transverse tie rod arm arranged in parallel up and down on the same side. The rear steering drive mechanism includes a rear steering power cylinder arranged at both ends on the same side of the rear axle. The two ends of the rear steering power cylinder are respectively hinged to the rear axle and the rear rotating arm. The rear transverse tie rod arms on both sides are connected through a rear transverse tie rod. The two ends of the rear transverse tie rod are respectively hinged to the ends of the rear transverse tie rod arms on both sides. The rear steering power cylinder is connected to the hydraulic system.

[0016] The rear steering drive mechanism of the rear axle has the same structure as the front steering drive mechanism of the front axle, which is more convenient and unified during procurement and assembly, and facilitates maintenance and replacement. At the same time, the front swing arm, rear swing arm, front and rear tie rod arms are arranged in parallel to avoid interference during movement.

[0017] The extension distance of the front tie rod arm is greater than the extension distance of the front steering arm, and the extension distance of the rear tie rod arm is greater than the extension distance of the rear steering arm.

[0018] In order to avoid interference between the front power steering cylinder or the rear power steering cylinder and the front tie rod or the rear tie rod during operation, the extension distance of the front tie rod arm and the rear tie rod arm is set longer. On the one hand, it ensures that no interference occurs during the operation. On the other hand, due to the leverage effect, the front tie rod or the rear tie rod can save more effort when pulling the wheel on the other side to rotate. Accordingly, the strength of the corresponding front tie rod or the rear tie rod can be set to lower or thinner and lighter materials, thereby reducing the weight of the vehicle and increasing the load capacity.

[0019] The front rotating arm and the rear rotating arm are respectively integrally formed with the front steering hitch and the rear steering hitch, and the front tie rod arm and the rear tie rod arm are respectively assembled and connected with the front steering hitch and the rear steering hitch.

[0020] Since the front steering arm and the rear steering arm have a shorter extension distance than the front tie rod arm and the rear tie rod arm, they can be directly obtained by one-piece molding when manufacturing the front steering knot and the rear steering knot. At the same time, since the front steering arm and the rear steering arm are the force points when the tire is turning, the one-piece molding has greater strength and longer service life. The relatively long front tie rod arm and the rear tie rod arm are separately manufactured and assembled to reduce production costs.

[0021] A rear angle sensor is provided at the hinged joint between the clamp-shaped half shaft and the rear steering knot.

[0022] By installing a rear angle sensor, the rear wheel steering angle can be monitored in real time, which corresponds to or is in a certain proportional relationship with the front wheel steering angle. When the reading of the rear angle sensor does not meet the expectations, it can remind the driver that the vehicle condition needs to be checked or maintained, thereby improving steering reliability and ensuring transportation safety.

[0023] Beneficial effects: The utility model sets a rear steering drive mechanism as the power source for rear wheel steering, and sets a transmission universal joint in the middle of the clamp half-shaft connecting the rear axle and the rear brake drum, which passes through one end of the clamp half-shaft and is connected to the rear axle drive shaft by a spline. While realizing transmission, the steering function is increased, and the steering of the rear wheels is realized through the articulation of the rear steering drive mechanism and the rear steering knot rather than the rotation of the rear axle, which can greatly reduce the wear of the rear wheels during steering and improve the service life of the tires. At the same time, the method of rotating the rear wheels is more labor-saving than the method of rotating the entire axle, and the requirements for the hydraulic system are lower. Therefore, the cost control of the hydraulic system can be controlled within a lower cost range, reducing the manufacturing cost of the entire vehicle; the steering angle is also larger than the steering angle of the push axle, and the steering speed is faster, which reduces the turning radius of the mining vehicle during steering, and is more suitable for mining environments with poor road conditions and narrow roads. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are merely embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0025] Figure 1 It is a schematic diagram of the overall structure of the rear axle of the present utility model.

[0026] Figure 2 This is a structural diagram of the installation of the clamp-type half-shaft and transmission cardan shaft of the rear axle of the utility model.

[0027] Figure 3 This is a schematic diagram of the installation position of the rear angle sensor of the present invention.

[0028] Figure 4 It is a schematic diagram of the overall structure of the front axle of the present utility model.

[0029] Figure 5 This is a schematic diagram of the installation position of the front angle sensor of the present utility model. DETAILED DESCRIPTION

[0030] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on the present invention.

[0032] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0033] like Figures 1 to 2 As shown, a steering mechanism for a mining dump truck includes a front axle steering assembly and a hydraulic system, and also includes a rear wheel steering assembly provided on the rear axle. The rear wheel steering assembly includes a rear steering hitch 2 rotatably connected to a rear brake drum 1 via a bearing, and a rear steering drive mechanism 3 provided on the rear axle. The rear steering drive mechanism 3 is hinged to the rear steering hitch 2 on both sides and connected to the hydraulic system.

[0034] The two ends of the rear axle are connected to the rear steering hitch 2 through a clamp half-shaft 4. The clamp half-shaft 4 is fixedly connected to the rear axle at one end close to the rear axle, and is hinged to the rear steering hitch 2 at one end close to the rear brake drum 1. A transmission universal joint 5 that is dynamically connected to the rear axle drive shaft and the rear brake drum 1 is provided in the middle of the clamp half-shaft 4.

[0035] The utility model sets a rear steering drive mechanism 3 as the power source for rear wheel steering, and sets a transmission universal joint 5 that penetrates the clamp half-shaft 4 and is connected to the rear axle drive shaft by a spline in the middle of the clamp half-shaft 4 connecting the rear axle and the rear brake drum 1, thereby increasing the steering function while realizing transmission, and realizing the steering of the rear wheels rather than the rotation of the rear axle through the articulation of the rear steering drive mechanism 3 and the rear steering knot 2, which can greatly reduce the wear of the rear wheels during steering and improve the service life of the tires. At the same time, the method of rotating the rear wheels is more labor-saving than the method of rotating the entire axle, and has lower requirements for the hydraulic system. Therefore, the cost control of the hydraulic system can be controlled within a lower cost range, thereby reducing the manufacturing cost of the entire vehicle; the steering angle is also larger than the steering angle of the push axle, and the steering speed is faster, which reduces the turning radius of the mining vehicle during steering, and is more suitable for mining environments with poor road conditions and narrow roads.

[0036] like Figure 4 and 5 As shown, it also includes a controller assembly for receiving and sending signals, and the controller assembly is connected to the hydraulic system signal. The front axle steering assembly includes a front steering knot 7 rotatably connected to the front brake drum 6 through a bearing and a front steering drive mechanism 8 arranged on the front axle. The front steering drive mechanism 8 is hinged to the front steering knots 7 on both sides and connected to the hydraulic system. The front steering knot 7 is hinged to both ends of the front axle, and a front angle sensor 9 is installed at the hinge. The front angle sensor 9 is connected to the controller assembly signal.

[0037] In order to improve the reaction speed when the rear wheels are turned and to improve the synchronization between the front and rear wheel steering, a front angle sensor 9 is provided at the front wheel steering position. In this embodiment, front angle sensors 9 are provided at the steering positions at both ends of the front axle. By collecting the changes of the front angle sensor 9 and feeding back to the controller assembly, the controller assembly directly sends instructions to the hydraulic system at the rear axle end. Compared with the traditional hydraulic system in which the front axle and the rear axle are connected through pipelines, this reduces the time for partial oil transmission, reduces the reaction time for rear wheel steering, and improves the synchronization of front and rear wheel steering.

[0038] A front tie rod arm 71 is provided on one side of the front steering knot 7, and the front steering drive mechanism 8 includes a front steering power cylinder 81 provided at both ends on the same side of the front axle. The two ends of the front steering power cylinder 81 are respectively hinged to the front axle and the middle part of the front tie rod arm 71, and the front tie rod arms 71 on both sides are connected by a front tie rod 82. The two ends of the front tie rod 82 are respectively hinged to the ends of the front tie rod arms 71 on both sides, and the front steering power cylinder 81 is connected to the hydraulic system.

[0039] By setting a single front tie rod arm 71 and setting a hinge hole in the middle to be hinged to the front steering power cylinder 81, since the front axle needs to bear relatively less weight, the front steering power cylinder 81 is hinged in the middle of the front tie rod arm 71 to ensure that the strength is sufficient to achieve steering, thereby reducing the production and manufacturing costs of the front steering knot 7.

[0040] The front steering joint 7 is provided with a front rotating arm and a front transverse tie rod arm 71 arranged in parallel up and down on the same side. The front steering drive mechanism 8 includes a front steering power cylinder 81 arranged at both ends on the same side of the front axle. The two ends of the front steering power cylinder 81 are respectively hinged to the front axle and the front rotating arm. The front transverse tie rod arms 71 on both sides are connected through a front transverse tie rod 82. The two ends of the front transverse tie rod 82 are respectively hinged to the ends of the front transverse tie rod arms 71 on both sides. The front steering power cylinder 81 is connected to the hydraulic system.

[0041] When it is applied to vehicles with larger tonnage, the positive pressure borne by the front wheels increases. When the front wheels turn, through the cooperation of the front steering power cylinder 81, the two steering power cylinders fill oil into different cavities at the same time, pushing and pulling at the same time to provide steering force, and overcome the hydraulic hysteresis or slight flow non-uniformity caused by the problem of inconsistent steering speed of the tires on both sides. When in action, the steering direction of the front axle is opposite to that of the rear axle. If the front steering drive mechanism 8 and the rear steering drive mechanism 3 are installed on the same side, the positions of the steering power cylinders for pushing out the front and rear axles are opposite when in action; if the front steering drive mechanism 8 and the rear steering drive mechanism 3 are installed on different sides, the positions of the steering power cylinders for pushing out the front and rear axles are at the same end when in action, realizing rear wheel steering and reducing the turning radius.

[0042] The rear steering joint 2 is provided with a rear rotating arm 21 and a rear transverse tie rod arm 22 arranged in parallel up and down on the same side. The rear steering drive mechanism 3 includes a rear steering power cylinder 31 arranged at both ends on the same side of the rear axle. The two ends of the rear steering power cylinder 31 are respectively hinged to the rear axle and the rear rotating arm 21. The rear transverse tie rod arms 22 on both sides are connected through a rear transverse tie rod 32. The two ends of the rear transverse tie rod 32 are respectively hinged to the ends of the rear transverse tie rod arms 22 on both sides. The rear steering power cylinder 31 is connected to the hydraulic system.

[0043] The rear steering drive mechanism 3 of the rear axle has the same structure as the front steering drive mechanism 8 of the front axle, which is more convenient and unified during procurement and assembly, and is easy to maintain and replace. At the same time, the front rotating arm, the rear rotating arm 21, the front transverse tie rod arm 71 and the rear transverse tie rod arm 22 are arranged in parallel to avoid interference during movement.

[0044] The extension distance of the front tie rod arm 71 is greater than that of the front steering arm, and the extension distance of the rear tie rod arm 22 is greater than that of the rear steering arm.

[0045] In order to avoid interference between the front steering power cylinder 81 or the rear steering power cylinder 31 and the front transverse tie rod 82 or the rear transverse tie rod 32 during operation, the extension distance of the front transverse tie rod arm 71 and the rear transverse tie rod arm 22 is set to be longer. On the one hand, it ensures that no interference occurs during the operation. On the other hand, due to the leverage effect, the front transverse tie rod 82 or the rear transverse tie rod 32 can save more effort when pulling the wheel on the other side to rotate. Accordingly, the strength of the front transverse tie rod 82 or the rear transverse tie rod 32 can be set to lower or thinner and lighter materials to reduce the weight of the vehicle and increase the load capacity.

[0046] The front rotating arm and the rear rotating arm 21 are respectively formed integrally with the front steering hitch 7 and the rear steering hitch 2 , and the front tie rod arm and the rear tie rod arm 22 are respectively assembled and connected to the front steering hitch 7 and the rear steering hitch 2 .

[0047] Since the front steering arm and the rear steering arm have a shorter extension distance than the front transverse tie rod arm 71 and the rear transverse tie rod arm 22, they can be directly obtained by one-piece molding when manufacturing the front steering knot 7 and the rear steering knot 2. At the same time, since the front steering arm and the rear steering arm are the force points when the tire is turning, the one-piece molding has greater strength and longer service life. The relatively long front transverse tie rod arm and the rear transverse tie rod arm 22 are separately manufactured and assembled to reduce production costs.

[0048] like Figure 3 As shown, a rear angle sensor 10 is provided at the hinged joint between the clamp half shaft 4 and the rear steering hitch 2 .

[0049] By installing the rear angle sensor 10, the rear wheel steering angle can be monitored in real time. In this embodiment, a rear angle sensor 10 is provided at the steering point at both ends of the rear axle, which corresponds to or is in a certain proportional relationship with the front wheel steering angle and can be adjusted as needed. When the reading of the rear angle sensor 10 does not meet the expectation, it can remind the driver that the vehicle condition needs to be checked or maintained, thereby improving steering reliability and ensuring transportation safety.

[0050] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0051] The above description of the disclosed embodiments will enable one skilled in the art to implement or use the present invention. Various modifications to these embodiments will be readily apparent to one skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not limited to the embodiments shown herein but is intended to conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A steering mechanism for a mining dump truck, comprising a front axle steering assembly and a hydraulic system, characterized in that: The vehicle also includes a rear wheel steering assembly arranged on the rear axle, the rear wheel steering assembly including a rear steering knot (2) rotatably connected to the rear brake drum (1) via a bearing and a rear steering drive mechanism (3) arranged on the rear axle, the rear steering drive mechanism (3) being hinged to the rear steering knots (2) on both sides and connected to a hydraulic system; The two ends of the rear axle are connected to the rear steering knot (2) through a clamp-shaped half-shaft (4). The clamp-shaped half-shaft (4) is fixedly connected to the rear axle at one end close to the rear axle, and is hinged to the rear steering knot (2) at one end close to the rear brake drum (1). A transmission universal joint (5) is provided in the middle of the clamp-shaped half-shaft (4) and is dynamically connected to the rear axle drive shaft and the rear brake drum (1).

2. The steering mechanism of a mining dump truck according to claim 1, characterized in that: The invention also includes a controller assembly for receiving and sending signals, wherein the controller assembly is connected to the hydraulic system signal. The front axle steering assembly includes a front steering knot (7) rotatably connected to the front brake drum (6) through a bearing and a front steering drive mechanism (8) arranged on the front axle. The front steering drive mechanism (8) is hinged to the front steering knots (7) on both sides and connected to the hydraulic system. The front steering knot (7) is hinged to both ends of the front axle, and a front angle sensor (9) is installed at the hinge. The front angle sensor (9) is connected to the controller assembly signal.

3. The steering mechanism of a mining dump truck according to claim 2, characterized in that: A front tie rod arm (71) is provided on one side of the front steering joint (7), and the front steering drive mechanism (8) includes a front steering assist oil cylinder (81) provided at both ends on the same side of the front axle, the two ends of the front steering assist oil cylinder (81) are respectively hinged to the front axle and the middle of the front tie rod arm (71), the front tie rod arms (71) on both sides are connected via a front tie rod (82), the two ends of the front tie rod (82) are respectively hinged to the ends of the front tie rod arms (71) on both sides, and the front steering assist oil cylinder (81) is connected to a hydraulic system.

4. The steering mechanism of a mining dump truck according to claim 2, characterized in that: The front steering joint (7) is provided with a front rotating arm and a front transverse tie rod arm (71) arranged in parallel up and down on the same side. The front steering drive mechanism (8) includes a front steering assist oil cylinder (81) provided at both ends on the same side of the front axle. Both ends of the front steering assist oil cylinder (81) are respectively hinged to the front axle and the front rotating arm. The front transverse tie rod arms (71) on both sides are connected via a front transverse tie rod (82). Both ends of the front transverse tie rod (82) are respectively hinged to the ends of the front transverse tie rod arms (71) on both sides. The front steering assist oil cylinder (81) is connected to a hydraulic system.

5. The steering mechanism of a mining dump truck according to claim 4, characterized in that: The rear steering joint (2) is provided with a rear rotating arm (21) and a rear transverse tie rod arm (22) arranged in parallel on the same side. The rear steering drive mechanism (3) includes a rear steering power cylinder (31) provided at both ends of the same side of the rear axle. The two ends of the rear steering power cylinder (31) are respectively hinged to the rear axle and the rear rotating arm (21). The rear transverse tie rod arms (22) on both sides are connected via a rear transverse tie rod (32). The two ends of the rear transverse tie rod (32) are respectively hinged to the ends of the rear transverse tie rod arms (22) on both sides. The rear steering power cylinder (31) is connected to a hydraulic system.

6. The steering mechanism of a mining dump truck according to claim 5, characterized in that: The extension distance of the front tie rod arm (71) is greater than the extension distance of the front steering arm, and the extension distance of the rear tie rod arm (22) is greater than the extension distance of the rear steering arm.

7. The steering mechanism of a mining dump truck according to claim 6, characterized in that: The front rotating arm and the rear rotating arm (21) are integrally formed with the front steering knot (7) and the rear steering knot (2), respectively; the tie rod arm (71) and the rear tie rod arm (22) are assembled and connected to the front steering knot (7) and the rear steering knot (2), respectively.

8. The steering mechanism of a mining dump truck according to claim 2, characterized in that: A rear angle sensor (10) is provided at the hinged joint between the clamp-shaped half shaft (4) and the rear steering hitch (2).

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