Variable operation blade structure for bulldozer and bulldozer

Abstract

The utility model relates to bulldozer leveling tool field discloses a variable operation spade structure for bulldozer and bulldozer, including center bulldozing spade, left side bulldozing spade, right side bulldozing spade, spade deformation pivot and deformation drive assembly, and left side bulldozing spade and right side bulldozing spade are respectively through spade deformation pivot with the both sides swing joint of center bulldozing spade, and deformation drive assembly is connected with left side bulldozing spade and right side bulldozing spade, and center bulldozing spade, left and right bulldozing spade are connected through spade deformation pivot, and the switching of straight inclination spade and U type spade is realized with the help of deformation drive assembly, and only a bulldozer with the spade structure can satisfy different operation needs, solve the problem that the equipment investment is big and the adaptability is poor in the prior art, and improve operation efficiency and economy.

Description

Technical Field

[0001] This utility model relates to the field of bulldozer leveling tools, specifically to a variable working blade structure for a bulldozer and a bulldozer. Background Technology

[0002] Bulldozers, as typical earthmoving equipment, are widely used in road construction, site leveling, mine stripping, and post-disaster clearing. With continuous advancements in hydraulic transmission, structural design, and control technology, bulldozers have seen significant improvements in power, reliability, and operating efficiency, gradually forming typical working device forms represented by straight tilting blades and U-shaped blades. Straight tilting blades, with their near-straight blade curvature, offer a wide working width and high leveling accuracy; while U-shaped blades, through the baffles on both sides, provide advantages such as large bulldozing capacity and strong material restraint.

[0003] However, while straight tilting blades are suitable for large-area leveling, slope shaping, and shallow cutting of hard soil, their material constraint is insufficient, and they are prone to spillage during long-distance transport, limiting the efficiency of a single operation. U-shaped blades, on the other hand, have a large bulldozing capacity and are suitable for concentrated transport of loose materials and medium-distance transport, but their curved blade arrangement results in a narrower working face than straight tilting blades, making them unsuitable for large-area leveling and high-precision construction. Because the blade structure of existing bulldozers is fixed, different types of blades are often required for different working conditions, increasing equipment investment and operational complexity. Therefore, if structural innovation could allow for flexible switching between straight tilting and U-shaped blades, only one machine would be needed to meet different bulldozing requirements, thereby improving the bulldozer's applicability and economic efficiency.

[0004] No effective solutions have yet been proposed to address the related technical issues. Summary of the Invention

[0005] The purpose of this utility model is to provide a variable-operation blade structure for bulldozers and a bulldozer, including a central bulldozer blade, left and right bulldozer blades, a blade deformation shaft, and a deformation drive assembly. The central bulldozer blade and the left and right bulldozer blades are connected by the blade deformation shaft. The deformation drive assembly enables the switching between a straight tilt blade and a U-shaped blade. Only one bulldozer with this blade structure is needed to meet different operational needs, solving the problems of large equipment investment and poor adaptability in the prior art, and improving operational efficiency and economy.

[0006] This utility model is achieved through the following technical solution: A variable working blade structure for a bulldozer includes a central bulldozer blade, a left bulldozer blade, a right bulldozer blade, a blade deformation shaft, and a deformation drive assembly. The left and right bulldozer blades are rotatably connected to the two sides of the central bulldozer blade via the blade deformation shaft. The deformation drive assembly is connected to the left and right bulldozer blades and is used to drive the left and right bulldozer blades to rotate around the blade deformation shaft, so that the central bulldozer blade, the left bulldozer blade, and the right bulldozer blade form a straight tilting blade or a U-shaped blade shape.

[0007] In this solution, the central bulldozer blade, left bulldozer blade, and right bulldozer blade are connected by the rotation of the blade deformation shaft, and in conjunction with the deformation drive assembly, the bulldozer can flexibly switch between straight tilt blade and U-shaped blade modes. Through mode switching, a single bulldozer can meet the needs of large-area leveling and high-precision construction in straight tilt blade mode, and can realize the centralized pushing and medium-distance transportation of loose materials in U-shaped blade mode. This significantly improves the adaptability of the bulldozer to different working conditions, reduces equipment investment costs and usage complexity, and takes into account the operational advantages of both blade types, thereby improving overall operating efficiency and economy.

[0008] As a further optimization of the blade structure, the deformation drive assembly includes a bulldozer blade deformation hydraulic device, a ball joint base, and a ball joint base slide rail; The ball joint base slide rails are respectively disposed at the rear of the left bulldozer blade and the right bulldozer blade, and the ball joint base is slidably disposed on the ball joint base slide rails; The bulldozer blade deformation hydraulic device includes a hydraulic cylinder and a hydraulic push rod with a ball end. One end of the hydraulic cylinder is connected to the bulldozer body, and the ball end of the hydraulic push rod is rotatably connected to the ball joint base. The hydraulic cylinder drives the ball joint base to slide along the ball joint base slide rail, thereby causing the left and right bulldozer blades to rotate around the blade deformation axis. The ball joint base slide rail provides directional constraints for the sliding of the ball joint base, ensuring that it moves smoothly along a predetermined trajectory. The hydraulic cylinder of the bulldozer blade deformation hydraulic device, in conjunction with the hydraulic push rod with a ball end, achieves efficient power transmission through hydraulic driving force, and allows a certain degree of rotational freedom through the rotational connection between the ball joint base and the ball end of the hydraulic push rod. This avoids force interference between the movement path of the hydraulic cylinder and the guide rail, effectively buffering small angular deviations and making the force transmission smoother.

[0009] As a further optimization of the blade structure, the ball joint base slide rail is provided with slide rail limiting plates at both ends, which can effectively limit the sliding stroke of the ball joint base on the slide rail, thereby controlling the angle range of rotation of the left and right bulldozer blades around the blade deformation axis, avoiding abnormal structural stress or operational instability caused by excessive sliding of the ball joint base leading to blade deformation angle exceeding the design range.

[0010] As a further optimization of the blade structure, the rear of the central bulldozer blade is also provided with multiple sets of connecting seats, including a bulldozer blade main arm connecting seat, a bulldozer blade auxiliary arm connecting seat, and a bulldozer blade lifting hydraulic device connecting seat. The bulldozer blade main boom connecting seat is connected to the bulldozer blade main boom on the bulldozer body, the bulldozer blade auxiliary boom connecting seat is connected to the bulldozer blade auxiliary boom on the bulldozer body, and the bulldozer blade lifting hydraulic device connecting seat is connected to the bulldozer blade lifting hydraulic device on the bulldozer body. The bulldozer blade connecting main boom is a load-bearing boom connected to both sides of the bulldozer body via rotating joints, allowing it to move up and down at small angles in the horizontal plane. The bulldozer blade connecting auxiliary boom is set on the bulldozer blade connecting main boom, effectively sharing the load-bearing pressure of the main boom and enhancing the stability and deformation resistance of the overall connection structure. The bulldozer blade lifting hydraulic device is set on both sides of the front of the bulldozer body, with its output end at a 45° angle to the horizontal plane. The extension and retraction of the bulldozer blade lifting hydraulic device can drive the central bulldozer blade to rotate, thereby adjusting the cutting angle. Combined with the up and down movement of the main boom and the support of the auxiliary boom, it realizes multi-degree-of-freedom movements such as blade lifting, angle adjustment, etc.

[0011] As a further optimization of the blade structure, the main boom connecting seat of the bulldozer blade, the auxiliary boom connecting seat of the bulldozer blade, and the lifting hydraulic device connecting seat of the bulldozer blade are all provided with reinforcing ribs on both sides, which can significantly enhance the structural strength and deformation resistance of each connecting seat.

[0012] As a further optimization of the blade structure, both the left and right bulldozer blades are equipped with lateral impact protection plates, which can effectively enhance the structural strength and impact resistance of the bulldozer blade sides. The lateral impact protection plates are electrically connected to work warning lights to remind surrounding personnel and other equipment to pay attention and avoid the area, reducing the risk of collisions caused by blind spots and further enhancing safety.

[0013] As a further optimization of the blade structure, in the straight tilting blade configuration, the angle of extension between the left and right bulldozer blades and the central bulldozer blade is 0°; in the U-shaped blade configuration, the maximum angle of extension between the left and right bulldozer blades and the central bulldozer blade is 30°.

[0014] A bulldozer includes a body structure module, a tracked chassis module, and a bulldozing operation module. The bulldozing operation module is a variable-operation blade structure. The bulldozing operation module is connected to the body structure module via a bulldozer blade connected to a main boom, a bulldozer blade connected to an auxiliary boom, and a bulldozer blade lifting hydraulic device. The tracked chassis module is located under the body structure module and is used to drive the bulldozer. This solution organically combines the variable-operation blade structure with the bulldozer, allowing a single bulldozer to efficiently complete large-area leveling, slope shaping, and other straight-slope operations, as well as U-slope operations such as centralized transportation of loose materials. It eliminates the need for multiple machines for different working conditions, significantly reducing equipment investment and operational complexity.

[0015] The tracked chassis module includes a drive wheel, a track roller, a support wheel, a track, and outer protective armor. The inner side of the track is equipped with positioning teeth that mesh with the positioning grooves of the drive wheel, the track roller, and the support wheel, effectively preventing the track from derailing or slipping during travel or operation, ensuring the stability and reliability of the track drive, and adapting to the travel needs in complex terrain. Furthermore, the outer protective armor of the track is equipped with a hydraulic device connection module to accommodate the hydraulic cylinder of the bulldozer blade deformation hydraulic device, reducing the impact and wear from stones, mud, and other debris during operation, and extending the service life of the track and wheel assembly.

[0016] The system also includes a control system module and a multi-source sensing system. The multi-source sensing system includes a lidar, a front camera module, a rear camera module, and a GNSS antenna, which are used for terrain scanning, environmental monitoring, and positioning, respectively. The control system module is electrically connected to the multi-source sensing system, the deformation drive component, and the tracked chassis module. It can avoid obstacles in a timely manner through environmental monitoring and optimize the operation path with the help of positioning and terrain data. This ensures construction safety while improving operation efficiency, realizing intelligent operation control of the bulldozer and enhancing the equipment's adaptability to diverse construction needs.

[0017] In summary, compared with the prior art, this utility model has the following main advantages and beneficial effects: 1. This utility model achieves flexible switching between a straight tilting shovel and a U-shaped shovel through the rotational connection and deformation drive assembly of the central bulldozer blade and the left and right bulldozer blades. A single unit can meet the needs of large-area leveling and centralized pushing and transporting, significantly improving the adaptability to different working conditions and reducing equipment investment and usage complexity. 2. This utility model controls the deformation angle through the limiting plates at both ends of the ball joint base slide rail, enhances the load-bearing capacity through the reinforcing ribs on both sides of the connecting seat, and buffers the collision with the impact-resistant protective plates on the sides of the left and right bulldozer blades. Combined with the ball joint structure, it reduces motion interference and mechanical wear, effectively improving the structural stability, impact resistance and service life, and ensuring the reliability of long-term high-intensity operation. 3. This utility model is equipped with a multi-source sensing system and a control system module, which can collect terrain, environment and positioning information in real time, automatically control the blade mode switching and driving status, realize intelligent path planning, obstacle avoidance and unmanned operation, improve the accuracy and efficiency of operation, reduce the need for manual intervention, and enhance the construction safety under complex working conditions. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings: Figure 1 This is an isometric view of the bulldozer with a variable working blade structure proposed in this utility model; Figure 2 This is a schematic diagram of the bulldozer from the other side of the equiaxed side. Figure 3 This is a schematic diagram of the U-shaped shovel of the variable working shovel of this utility model; Figure 4 This is a schematic diagram of the straight tilting shovel shape of the variable working blade of this utility model.

[0019] The attached diagram shows the markings and corresponding component names: 1-Bulldozer operation module, 2-Bulldozer blade lifting hydraulic device, 3-Bulldozer body structure module, 4-LiDAR, 5-Rear camera module, 6-GNSS antenna, 7-Hydraulic oil cooler air intake shroud, 8-Body protective armor, 9-Main control bus maintenance compartment, 10-Front camera module, 11-Actuator interface maintenance compartment, 12-Drive wheel, 13-Carrier roller, 14-Work warning light, 15-Support wheel, 16-Crawler outer protective armor, 17-Hydraulic device connection module, 18-Crawler track, 19-Bulldozer blade 20-Heat dissipation grid, 21-Bulldozer blade connecting auxiliary arm, 22-Bulldozer blade deformation hydraulic device, 23-Rear side door, 24-Rear working warning light, 25-Rear multi-functional light group, 26-Shovel blade side impact protection plate, 27-Slide rail limit plate, 28-Spherical hinge base slide rail, 29-Left side bulldozer blade, 30-Bulldozer blade main arm connecting seat, 31-Bulldozer blade auxiliary arm connecting seat, 32-Bulldozer blade lifting hydraulic device connecting seat, 33-Center bulldozer blade, 34-Shovel blade deformation pivot, 35-Right side bulldozer blade. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0021] Example 1 This embodiment 1 provides a variable working blade structure for a bulldozer, such as Figures 1-4 As shown, it includes a central bulldozer blade 33, a left bulldozer blade 29, a right bulldozer blade 35, a blade deformation shaft 34, and a deformation drive assembly; The central bulldozer blade 33 is the main body of the blade and bears the main load of bulldozing operations. The left bulldozer blade 29 and the right bulldozer blade 35 are rotatably connected to the left and right sides of the central bulldozer blade 33 through the blade deformation shaft 34. The left bulldozer blade 29 and the right bulldozer blade 35 can rotate and unfold around the blade deformation shaft 34 under the drive of the deformation drive component. By adjusting the relative angle of the three, the straight tilting blade and the U-shaped blade form can be switched. In the straight tilting blade form, the extension angle of the left bulldozer blade 29, the right bulldozer blade 35 and the central bulldozer blade 33 is 0°, and the whole is in a straight line shape, which is suitable for large-area leveling, slope repair and shaping and other operations. In the U-shaped blade form, the maximum extension angle of the two bulldozer blades is 30°, forming a barrier structure, which is suitable for the centralized pushing and transporting of loose materials.

[0022] Specifically, such as Figure 1 and Figure 3 As shown, the aforementioned deformation drive assembly includes a bulldozer blade deformation hydraulic device 22, a ball joint base, and a ball joint base slide rail 28, used to drive the rotation and unfolding of the left bulldozer blade 29 and the right bulldozer blade 35. The ball joint base slide rail 28 is fixed to the rear of the left bulldozer blade 29 and the right bulldozer blade 35, providing a directional sliding track for the ball joint base. The ball joint base is slidably mounted on the ball joint base slide rail 28 and is rotatably connected to the ball end of the hydraulic push rod in the bulldozer blade deformation hydraulic device 22. One end of the hydraulic cylinder of the bulldozer blade deformation hydraulic device 22 is connected to the bulldozer body. When the hydraulic cylinder extends or retracts, the hydraulic push rod slides along the ball joint base slide rail 28 via the ball joint base, thereby driving the left bulldozer blade 29 and the right bulldozer blade 35 to rotate around the blade deformation axis 34, achieving shape switching.

[0023] At the same time, such as Figure 3 As shown, slide rail limiting plates 27 are provided at both ends of the ball joint base slide rail 28 to limit the sliding stroke of the ball joint base, thereby controlling the maximum rotation angle of the left bulldozer blade 29 and the right bulldozer blade 35, ensuring that the maximum extension angle does not exceed 30° in the U-shaped blade form and the extension angle is stable at 0° in the straight tilt blade form, avoiding abnormal structural stress or unstable operation due to excessive rotation.

[0024] To further adapt to different operating depth requirements, in this embodiment, such as Figures 1-3As shown, multiple sets of connecting seats are provided at the rear of the central bulldozer blade 33, including a bulldozer blade main arm connecting seat 30, a bulldozer blade auxiliary arm connecting seat 31, and a bulldozer blade lifting hydraulic device connecting seat 32, which are used to connect the blade structure with the bulldozer body. The bulldozer blade main boom connecting seat 30 is connected to the bulldozer blade main boom 19 on the bulldozer body. The bulldozer blade main boom 19 is a load-bearing boom, connected to both sides of the vehicle body via rotating joints, allowing for small-angle up-and-down movement in the horizontal plane, bearing the main load during blade operation. The bulldozer blade auxiliary boom connecting seat 31 is connected to the bulldozer blade auxiliary boom 21 on the bulldozer body. The bulldozer blade auxiliary boom 21 is mounted on the bulldozer blade main boom 19, used to share the load and provide additional back support, enhancing the overall structural stability. The bulldozer blade lifting hydraulic device connecting seat 32 is connected to the bulldozer blade lifting hydraulic device 2 on the bulldozer body. This hydraulic device is located on both sides of the front of the vehicle body, with its output end at a 45° angle to the horizontal plane. Through telescopic movement, it drives the central bulldozer blade 33 to rotate, realizing the adjustment of the blade cutting angle and lifting action, achieving the purpose of adapting to different working depth requirements. In addition, each connecting seat has reinforcing ribs on both sides, which can further enhance the structural strength of the connection part, disperse the concentrated stress during operation, and prevent the connecting seat from deforming or breaking.

[0025] In some embodiments, the sides of the left bulldozer blade 29 and the right bulldozer blade 35 are provided with blade side impact protection plates 26, which are made of high-strength steel and can buffer the impact force of collision with lateral obstacles (such as rocks and wall edges) during operation, protecting the blade side structure from damage. The blade side impact protection plates are also electrically connected to work warning lights 14, which are set on the bulldozer vehicle body and emit a bright light signal during operation. Especially in low-light environments or multi-equipment collaborative scenarios, they can remind surrounding personnel and equipment to pay attention and avoid the danger, thereby improving work safety.

[0026] Example 2 This embodiment 2 provides a bulldozer, including a vehicle body structure module 3, a tracked chassis module, and a bulldozing operation module 1. The bulldozing operation module 1 adopts the variable blade structure described in embodiment 1, such as... Figures 1-2 As shown, its specific components are as follows: The vehicle body structure module 3 serves as the load-bearing foundation for the entire machine, employing a box-type steel frame. The upper part integrates a multi-source sensing system and a control system, while the lower part connects to the tracked chassis module. The front is connected to the main boom 19 via a bulldozer blade, and the auxiliary boom 21 and lifting hydraulic device 2 are also connected to the bulldozing module 1. Furthermore, key components of the vehicle body structure module 3 are covered by the vehicle body protective armor 8 (such as the engine compartment and control system compartment), constructed with Q460 high-strength steel to withstand impacts and scratches from gravel, protecting internal components. Additionally, square-arranged heat sinks are installed on both sides of the front of the vehicle body structure module 3. The grille 20 has two rows of vertically arranged heat dissipation grilles 20 at the front of the vehicle body, and the hydraulic oil cooler air intake guide 7 is installed on the top of the vehicle body to form multi-directional air intake channels. The aforementioned heat dissipation grilles 20 introduce external cold air into the vehicle body and directly act on the power system and control system modules. With the help of natural convection and the combined action of the vehicle-mounted forced fan, the airflow is fully circulated in the compartment. The hydraulic oil cooler air intake guide 7 optimizes the cooling airflow path and improves the heat dissipation efficiency of the hydraulic oil cooler. The power system modules are quickly cooled by the cold air, avoiding excessive temperature rise due to long-term high-load operation.

[0027] In some embodiments, the side of the vehicle body structure module 3 is also equipped with a main control bus maintenance compartment 9 and an actuator interface maintenance compartment 11. The main control bus maintenance compartment 9 and the actuator interface maintenance compartment 11 respectively integrate the control system bus and the actuator interface, which facilitates quick maintenance and parameter debugging and shortens maintenance time.

[0028] More specifically, such as Figure 1 and Figure 2 As shown, the tracked chassis module is located at the lower part of the vehicle body structure module 3, providing driving power for the whole machine, including drive wheel 12, track roller 13, support roller 15, track 18 and track outer protective armor 16. The track 18 has positioning teeth on its inner side, which mesh with the positioning grooves of the drive wheel 12, track roller 13, and support wheel 15 to form a track-type transmission structure. This effectively prevents the track from derailing or slipping, ensuring the bulldozer can travel stably in complex terrains such as soft soil and gravel roads. The drive wheel 12 receives power from the engine through the transmission system, driving the track 18 to rotate and enabling the machine to travel and turn. The track roller 13 and support wheel 15 support the track 18, reducing its sag and ensuring smooth track transmission. The outer protective armor 16 of the track protects the track and wheel assembly from the impact and wear of external debris (such as mud and gravel), extending the service life of chassis components. In addition, the protective armor is equipped with a hydraulic device connection module 17, which is used to accommodate and fix the hydraulic cylinder of the bulldozer blade deformation hydraulic device 22, ensuring that the hydraulic device is installed firmly and protected from external damage.

[0029] Example 3 To achieve fully unmanned operation under complex working conditions, this embodiment 3 also provides a bulldozer based on embodiment 2. The bulldozer also includes a control system module and a multi-source sensing system. In this embodiment, the multi-source perception system includes a lidar 4, located high on the top of the vehicle body, with a scanning range of 360°, used for terrain modeling; it also includes a front camera module 10 and a rear camera module 5 located on both sides of the vehicle body to achieve all-round environmental monitoring; and a GNSS antenna 6 is used for precise positioning to provide data support for path planning.

[0030] Furthermore, the control system module is electrically connected to the multi-source sensing system, deformation drive components, and tracked chassis module. It processes the sensing data through an embedded computing unit and automatically controls the blade mode switching, track travel speed, and steering to achieve intelligent operation and reduce manual intervention.

[0031] Working principle: During operation, the multi-source sensing system collects terrain, environmental and location information in real time. The control system module drives the ball joint base to slide along the ball joint base slide rail 28 through the bulldozer blade deformation hydraulic device 22 according to the operation requirements (such as leveling or pushing). This drives the left bulldozer blade 29 and the right bulldozer blade 35 to rotate around the blade deformation shaft 34, realizing the switching between straight tilt blade and U-shaped blade. At the same time, the bulldozer blade lifting hydraulic device 2 adjusts the blade height and cutting angle, and the track chassis module drives the whole machine to move. All components work together to achieve efficient operation.

[0032] Example 4 To ensure the safe operation of the intelligent unmanned bulldozer in low-visibility, dusty, or potentially flammable and explosive environments, this embodiment installs multiple explosion-proof lighting fixtures on the outer wall of the bulldozer body structure module 3. Specifically, a forward-facing explosion-proof work light is installed above the front of the vehicle to illuminate the working area of ​​the bulldozer blade; a rear-facing rear work warning light 24 and a rear multi-functional light group 25 are arranged at the rear of the vehicle, located outside the rear hatch 23, to alert personnel and machinery behind to take evasive action; lateral explosion-proof lights are also installed on both sides of the vehicle to extend the lateral visibility range and ensure safe operation at night, in tunnels, or in low-light environments in mining areas. The aforementioned explosion-proof lighting fixtures adopt a structural design with an explosion-proof rating of Ex d IIB T4 Gb and are electrically connected to the control system module via explosion-proof cables. The central control unit manages their activation, deactivation, and illumination adjustment, ensuring stable and reliable safe lighting under complex working conditions.

[0033] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above description is only a specific embodiment of this utility model and is not intended to limit the scope of protection of this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the scope of protection of this utility model.

Claims

1. A variable-operation blade structure for a bulldozer, characterized in that, Includes a central bulldozer blade (33), a left bulldozer blade (29), a right bulldozer blade (35), a blade deformation shaft (34), and a deformation drive assembly; The left bulldozer blade (29) and the right bulldozer blade (35) are rotatably connected to the two sides of the center bulldozer blade (33) via the blade deformation shaft (34); the deformation drive assembly is connected to the left bulldozer blade (29) and the right bulldozer blade (35) to drive the left bulldozer blade (29) and the right bulldozer blade (35) to rotate around the blade deformation shaft (34), so that the center bulldozer blade (33), the left bulldozer blade (29) and the right bulldozer blade (35) form a straight tilting blade or a U-shaped blade shape; The deformation drive assembly includes a bulldozer blade deformation hydraulic device (22), a ball joint base and a ball joint base slide rail (28). The ball joint base slide rail (28) is respectively disposed at the rear of the left bulldozer blade (29) and the right bulldozer blade (35), and the ball joint base is slidably disposed on the ball joint base slide rail (28); The bulldozer blade deformation hydraulic device (22) includes a hydraulic cylinder and a hydraulic push rod with a ball end. One end of the hydraulic cylinder is connected to the bulldozer body, and the ball end of the hydraulic push rod is rotatably connected to the ball joint base. The hydraulic cylinder drives the ball joint base to slide along the ball joint base slide rail (28), thereby driving the left bulldozer blade (29) and the right bulldozer blade (35) to rotate around the blade deformation axis (34).

2. The variable-operation blade structure for a bulldozer according to claim 1, characterized in that, The ball joint base slide rail (28) is provided with slide rail limiting plates (27) at both ends.

3. The variable-operation blade structure for a bulldozer according to claim 1, characterized in that, The rear of the central bulldozer blade (33) is also provided with multiple sets of connecting seats, including the main arm connecting seat (30), the auxiliary arm connecting seat (31), and the lifting hydraulic device connecting seat (32). The bulldozer blade main boom connecting seat (30) is connected to the bulldozer blade main boom (19) on the bulldozer body, the bulldozer blade auxiliary boom connecting seat (31) is connected to the bulldozer blade auxiliary boom (21) on the bulldozer body, and the bulldozer blade lifting hydraulic device connecting seat (32) is connected to the bulldozer blade lifting hydraulic device (2) on the bulldozer body. Among them, the main arm (19) of the bulldozer blade is a load-bearing arm, which is connected to both sides of the bulldozer body through rotating joints, so that it can move up and down at a small angle in the horizontal plane; the auxiliary arm (21) of the bulldozer blade is set on the main arm (19) of the bulldozer blade; the hydraulic lifting device (2) of the bulldozer blade is set on both sides of the front of the bulldozer body, and its output end is at a 45° angle with the horizontal plane. The extension and retraction movement of the hydraulic lifting device (2) of the bulldozer blade can drive the central bulldozer blade (33) to rotate.

4. The variable-operation blade structure for a bulldozer according to claim 3, characterized in that, The bulldozer blade main boom connecting seat (30), the bulldozer blade auxiliary boom connecting seat (31), and the bulldozer blade lifting hydraulic device connecting seat (32) are all provided with reinforcing ribs on both sides.

5. A variable-operation blade structure for a bulldozer according to claim 1, characterized in that, Both the left bulldozer blade (29) and the right bulldozer blade (35) are provided with blade side impact protection plates (26), and the blade side impact protection plates (26) are electrically connected to work warning lights (14).

6. The variable-operation blade structure for a bulldozer according to claim 1, characterized in that, In the straight tilting shovel configuration, the angle of extension between the left bulldozer blade (29) and the right bulldozer blade (35) and the center bulldozer blade (33) is 0°; in the U-shaped shovel configuration, the maximum angle of extension between the left bulldozer blade (29) and the right bulldozer blade (35) and the center bulldozer blade (33) is 30°.

7. A bulldozer, characterized in that, The device includes a vehicle body structure module (3), a tracked chassis module, and a bulldozing operation module (1). The bulldozing operation module (1) is a variable working blade structure as described in any one of claims 1-6. The bulldozing operation module (1) is connected to the vehicle body structure module (3) via a bulldozing blade connecting to the main boom (19), a bulldozing blade connecting to the auxiliary boom (21), and a bulldozing blade lifting hydraulic device (2). The tracked chassis module is located at the lower part of the vehicle body structure module (3) and is used to drive the bulldozer to travel.

8. A bulldozer according to claim 7, characterized in that, The tracked chassis module includes a drive wheel (12), a track roller (13), a support wheel (15), a track (18), and track outer protective armor (16); the inner side of the track (18) is provided with positioning teeth, which mesh with the positioning grooves of the drive wheel (12), the track roller (13), and the support wheel (15); and the track outer protective armor (16) is provided with a hydraulic device connection module (17) for accommodating the hydraulic cylinder of the bulldozer blade deformation hydraulic device (22).

9. A bulldozer according to claim 7, characterized in that, It also includes a control system module and a multi-source sensing system; the multi-source sensing system includes a lidar (4), a front camera module (10) and a rear camera module (5) and a GNSS antenna (6), which are used for terrain scanning, environmental monitoring and positioning, respectively; the control system module is electrically connected to the multi-source sensing system, the deformation drive component and the tracked chassis module.

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