CN221372303U

CN221372303U - Bulldozer with flattening and initial compaction functions

Info

Publication number: CN221372303U
Application number: CN202323273016.3U
Authority: CN
Inventors: 张海龙; 万光前; 赵正武; 苏东华; 尹正奎; 郑焕忍; 王娜
Original assignee: Shantui Chutian Construction Machinery Co Ltd
Current assignee: Shantui Chutian Construction Machinery Co Ltd
Priority date: 2023-12-01
Filing date: 2023-12-01
Publication date: 2024-07-19
Anticipated expiration: 2033-12-01

Abstract

The utility model relates to the technical field of engineering machinery, in particular to a bulldozer with flattening and initial compacting functions, which comprises a crawler chassis, wherein a power bin and a cab are respectively arranged at the front end and the rear end above the crawler chassis, a bulldozer structure for flattening a foundation surface is fixedly arranged at the front end of the crawler chassis, a vibrating steel wheel structure for vibrating compaction is fixedly arranged at the rear end of the crawler chassis, the vibrating steel wheel structure comprises an upper connecting frame, the inner end of the upper connecting frame is fixedly connected to the end face of the rear end of the crawler chassis, a vibrating wheel structure is arranged at the outer end of the upper connecting frame, and the bottom of the vibrating wheel structure contacts the foundation surface in a working state. The utility model has the following beneficial effects: eccentric vibration generated by high-speed rotation of the eccentric shaft is used for tamping the ground, so that the equipment is high in stability and good in compaction effect.

Description

Bulldozer with flattening and initial compaction functions

Technical Field

The utility model relates to the technical field of engineering machinery, in particular to a bulldozer with flattening and initial compaction functions.

Background

The bulldozer is a widely applied engineering machine, and the main structure of the bulldozer comprises an engine, a chassis, a cab, a bulldozer plate and other parts, and the bulldozer can clean, level, carry and other operations on the ground by utilizing the inclined movement of the bulldozer plate through the support of the chassis and the power provided by the engine. With the development of technology, single-function dozers are no longer able to meet engineering demands, and some multi-function dozer machines are gradually beginning to be used.

For example, in patent publication CN215052860U, there is disclosed a bulldozer-compactor all-in-one machine comprising a first pin passing through a first pin hole and a second pin hole of a traction frame at the tail of the bulldozer in order to connect the first and second traction frames together; the second shaft pin sequentially passes through the second shaft hole and the third shaft hole of the traction frame to connect the second traction frame with the third traction frame; the traction frame III and the cross beam I are welded together; the inner side surface of the first cross beam is connected with the end surface of the side plate; the other end face of the side plate is connected with the inner side face of the second cross beam; the middle position of the side plate is provided with a shaft hole in which a wheel shaft is arranged; the wheel axle sequentially passes through the axle hole in the middle of the side plate and the axle hole in the middle of the steel wheel.

According to the prior art document, although the bulldozer and the road roller complete the work which is completed by the bulldozer and the road roller, the working time is saved, the construction speed is improved, and the labor cost is reduced. However, the machine only can compact earthwork by means of the dead weight of the steel wheel, the construction efficiency is low, and the compaction effect is poor.

Therefore, the present utility model has been made in view of the problems of the prior art, and therefore, a bulldozer with flattening and initial compaction functions is provided herein to better solve the problems of the prior art.

Disclosure of utility model

The utility model aims to solve one of the technical problems, and adopts the following technical scheme: the bulldozer with the flattening and initial compacting functions comprises a crawler travel chassis, wherein a power bin and a cab are respectively arranged at the front end and the rear end above the crawler travel chassis, a bulldozer plate structure for flattening a foundation surface is fixedly arranged at the front end of the crawler travel chassis, and a vibrating steel wheel structure for vibrating compaction is fixedly arranged at the rear end of the crawler travel chassis;

the vibrating steel wheel structure comprises an upper connecting frame, the inner end of the upper connecting frame is fixedly connected to the end face of the rear end of the crawler chassis, the vibrating wheel structure is mounted at the outer end of the upper connecting frame, and the bottom of the vibrating wheel structure contacts with the foundation surface in a working state.

In any of the above schemes, preferably, the boarding connection frame comprises a connection lug plate, the lower end of the connection lug plate is fixedly connected with the vibration wheel structure, connection parts are formed on two sides of the upper part of the connection lug plate, an adjustable connection unit is respectively installed at the end parts of the two connection parts, the end parts of the adjustable connection units are movably hinged with the end parts of the connection parts at corresponding positions, and the other end parts of the adjustable connection units are respectively and fixedly connected to the end face of the rear end of the crawler chassis;

The adjustable connecting unit comprises a front supporting plate fixedly installed on the end face of the rear end of the crawler chassis, an upper connecting rod and a lower connecting rod are respectively connected with the upper portion and the lower portion of the front end of the front supporting plate in a hinged mode through a pin shaft, the rear end of the upper connecting rod is connected with the upper side of the corresponding end portion of the connecting portion in a hinged mode through a pin shaft, and the rear end of the lower connecting rod is connected with the lower side of the corresponding end portion of the connecting portion in a hinged mode through a pin shaft.

In any of the above schemes, preferably, the vibration wheel structure includes an ear plate seat, the upper end of the ear plate seat is fixedly connected with the lower end of the connecting ear plate, a vibration wheel unit is arranged below the ear plate seat, two ends of the vibration wheel unit are respectively connected with a bracket unit, and the upper ends of the two bracket units are respectively connected with two ends of the ear plate seat;

The vibration wheel unit comprises a steel wheel, and a hydraulic motor, a coupler and an eccentric rotating shaft are coaxially and fixedly connected in sequence along the axial direction of the steel wheel in the inner cavity of the steel wheel;

a first vibration bearing and a second vibration bearing which are arranged in the inner cavity of the steel wheel are respectively matched and arranged at two sides of the eccentric rotating shaft;

The support unit comprises a support plate, the upper end of the support plate is fixedly connected to the end part of the ear plate seat, and a shock absorber, an outer connecting plate, a walking bearing and an inner connecting plate are sequentially arranged on the inner side of the lower end of the support plate.

In any of the above schemes, preferably, a hydraulic oil tank is fixedly arranged at one side of the cab, a first hydraulic oil pipeline and a second hydraulic oil pipeline are fixedly connected to the hydraulic oil tank, a first operation valve and a second operation valve are fixedly arranged in the inner space of the cab, the first operation valve is used for controlling the opening and closing of the first hydraulic oil pipeline, and the second operation valve is used for controlling the opening and closing of the second hydraulic oil pipeline.

In any of the above schemes, preferably, a hydraulic cylinder is hinged at the middle part of the rear end of the crawler chassis, the other end of the hydraulic cylinder is hinged in a middle mounting seat of the pin shaft for connecting the upper connecting rod and the connecting part, and one end of the first hydraulic oil pipeline is connected with an oil port of the hydraulic cylinder.

In any of the above solutions, preferably, one end of the second hydraulic oil line is connected to an oil port of the hydraulic motor.

In any of the above embodiments, it is preferable that a wiper is fixedly installed at each of both sides of the ear plate seat.

In any of the above schemes, preferably, two ends of the upper part of the bulldozer plate structure are respectively movably connected to two sides of the power bin, and two ends of the lower part of the bulldozer plate structure are respectively movably connected to two sides of the crawler chassis.

Compared with the prior art, the utility model has the following beneficial effects:

1. According to the utility model, the steel wheel with the vibration compaction function is arranged at the rear part of the bulldozer, and the flat soft ground can be compacted through the steel wheel, so that the working efficiency is improved, the special road roller equipment and the manpower for controlling the road roller are saved, and the construction cost is reduced.

2. The driver directly controls the lifting and tamping operation of the rear-end vibrating steel wheel through the control rod in the cab, the construction operation is simple and efficient, and the vibrating steel wheel is eccentric vibration generated by high-speed rotation of the eccentric shaft, so that the equipment is high in stability and good in compaction effect.

3. The utility model is based on a bulldozer with strong heavy-gradient on-load operation capability, integrates the function of a road roller, has high leveling precision of a shovel blade, is not only suitable for plane road construction, but also can ensure good construction quality under the construction environment facing heavy-gradient embankment slopes, avoids the occurrence of over-digging phenomenon, and realizes one-machine leveling and compaction operation under special scenes.

Drawings

In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. Like elements or features are generally identified by like reference numerals throughout the drawings. In the drawings, the elements or components are not necessarily drawn to scale.

FIG. 1 is a side view of a bulldozer according to the present utility model.

FIG. 2 is a perspective view of the rear end of the bulldozer according to the present utility model.

Fig. 3 is a schematic view of the structure of the upper carriage connecting frame of the present utility model.

Fig. 4 is an exploded view of the structure of the vibrating wheel of the present utility model.

FIG. 5 is a top view of the bulldozer according to the present utility model.

Fig. 6 is a plan sectional view of the structure of the vibrating wheel of the present utility model.

Fig. 7 is a perspective cross-sectional view of the structure of the vibrating wheel of the present utility model.

In the figure, 1, a crawler belt walking chassis; 2. a power bin; 3. a cab; 4. a bulldozer plate structure; 5. a hydraulic oil tank; 6. a first hydraulic oil line; 7. a second hydraulic oil line; 8. connecting an ear plate; 9. a front support plate; 10. a connection part; 11. an upper connecting rod; 12. a lower connecting rod; 13. an ear plate seat; 14. a steel wheel; 15. a hydraulic motor; 16. a coupling; 17. a first vibration bearing; 18. an eccentric rotating shaft; 19. a second vibration bearing; 20. a support plate; 21. a damper; 22. an outer connecting plate; 23. a walking bearing; 24. an inner connection plate; 25. a hydraulic cylinder; 26. a first operation valve; 27. a second operation valve; 28. a mud scraping plate.

Detailed Description

Embodiments of the technical scheme of the present utility model will be described in detail below with reference to the accompanying drawings. The following examples are only for more clearly illustrating the technical aspects of the present utility model, and thus are merely examples, and are not intended to limit the scope of the present utility model. The specific structure of the utility model is shown in fig. 1-7.

The bulldozer with the flattening and initial compacting functions comprises a crawler chassis 1, wherein a power bin 2 and a cab 3 are respectively arranged at the front end and the rear end above the crawler chassis 1, a bulldozer plate structure 4 for flattening a foundation surface is fixedly arranged at the front end of the crawler chassis 1, and a vibrating steel wheel structure for vibrating compaction is fixedly arranged at the rear end of the crawler chassis 1;

The vibrating steel wheel structure comprises an upper connecting frame, the inner end of the upper connecting frame is fixedly connected to the end face of the rear end of the crawler chassis 1, the vibrating wheel structure is mounted at the outer end of the upper connecting frame, and the bottom of the vibrating wheel structure contacts with a foundation surface in a working state.

The steel wheel with the vibration compaction function is arranged at the rear part of the bulldozer, and the organic combination of the bulldozer function and the road roller function is realized, so that not only is a large-scale machine saved, but also the manpower for controlling the machine is saved, and the construction cost is reduced.

When the bulldozer works, a driver controls the bulldozer to walk back and forth, and the bulldozer blade structure 4 is positioned at the front of the machine, and can tilt forward or backward and move left and right. When the bulldozer plate tilts forwards, sundries and earth and stones on the ground can be pushed backwards, so that cleaning and carrying operations are realized; when the blade is tilted rearward, earth and stones may be piled up to form a raised ground.

After the soil is flattened by the bulldozer structure, the vibrating steel wheel structure is controlled by a driver to start, the liftable vibrating steel wheel structure arranged at the rear part of the bulldozer gradually moves downwards until the bottom of the steel wheel 14 contacts the ground, at the moment, the steel wheel 14 rotates by itself along with the movement of a machine, the ground is preliminarily compacted, meanwhile, the structure in the soil starts to eccentrically rotate, the rotating centrifugal force causes the generation of strong exciting force, and the steel wheel 14 rotates and simultaneously vibrates at a periodic and continuous high frequency, so that the soft ground after flattening is finally compacted, and the compacting effect is better than that of the traditional mode.

In the actual construction process, the bulldozer has the advantages of high reliability, strong stability and good compaction effect.

In any of the above solutions, preferably, the upper vehicle connecting frame includes a connecting lug plate 8, the lower end of the connecting lug plate 8 is fixedly connected with the vibrating wheel structure, two sides of the upper portion of the connecting lug plate 8 are both formed with connecting portions 10, the end portions of the two connecting portions 10 are respectively provided with an adjustable connecting unit, the end portions of the adjustable connecting units are movably hinged with the end portions of the connecting portions 10 at corresponding positions, and the other ends of the adjustable connecting units are respectively and fixedly connected to the rear end face of the crawler chassis 1;

The adjustable connecting unit comprises a front supporting plate 9 fixedly installed on the end face of the rear end of the crawler chassis 1, an upper connecting rod 11 and a lower connecting rod 12 are respectively connected with the upper portion and the lower portion of the front end of the front supporting plate 9 through pin shafts in a hinged mode, the rear end of the upper connecting rod 11 is connected with the upper side of the corresponding end portion of the connecting portion 10 through pin shafts in a hinged mode, and the rear end of the lower connecting rod 12 is connected with the lower side of the corresponding end portion of the connecting portion 10 through pin shafts in a hinged mode.

The front supporting plate 9 is fixedly arranged on the end face of the rear end of the crawler chassis 1 as a fixing piece, and the upper connecting rod 11 and the lower connecting rod 12 can rotate around the corresponding pin shafts respectively so as to drive the connecting lug plate 8 to move up and down. The lower end of the connecting lug plate 8 is fixedly provided with a vibrating wheel structure, and when the connecting lug plate 8 moves, the vibrating wheel structure moves along with the connecting lug plate 8, so that the contact and separation with a construction foundation surface are realized.

The upper connecting frame not only can transmit the weight of the upper connecting frame to the vibrating wheel structure, so that the compacting effect is better, but also has enough large upper connecting frame mass, so that the upward impact of exciting force can be reduced, the hydraulic oil cylinder is protected, and oil leakage is avoided.

In any of the above schemes, preferably, the vibration wheel structure includes an ear plate seat 13, the upper end of the ear plate seat 13 is fixedly connected with the lower end of the connecting ear plate 8, a vibration wheel unit is arranged below the ear plate seat 13, two ends of the vibration wheel unit are respectively connected with a bracket unit, and the upper ends of the two bracket units are respectively connected with two ends of the ear plate seat 13;

The vibration wheel unit comprises a steel wheel 14, and a hydraulic motor 15, a coupler 16 and an eccentric rotating shaft 18 are coaxially and fixedly connected in sequence along the axial direction of the steel wheel 14 in the inner cavity of the steel wheel 14;

A first vibration bearing 17 and a second vibration bearing 19 which are arranged in the inner cavity of the steel wheel 14 are respectively matched and arranged at two sides of the eccentric rotating shaft 18;

The support unit comprises a support plate 20, the upper end of the support plate 20 is fixedly connected to the end part of the ear plate seat 13, and a shock absorber 21, an outer connecting plate 22, a walking bearing 23 and an inner connecting plate 24 are sequentially arranged on the inner side of the lower end of the support plate 20.

Two mounting plates 20 are fixedly arranged at two ends of the lug plate seat 13, a damper 21 is fixedly arranged on the mounting plates 20, the feedback force of vibration of the steel wheel 14 can be greatly reduced through the damper 21, the firmness of the structure and the stability of equipment are ensured, meanwhile, the other end of the damper 21 is fixedly arranged on the outer connecting plate 22, and the positions of the mounting plates 20, the dampers 21 and the outer connecting plate 22 are fixed. An inner connecting plate 24 is arranged on the inner side of the outer connecting plate 22, the inner connecting plate 24 is fixedly arranged in the inner cavity of the steel wheel 14, a walking bearing 23 is arranged between the outer connecting plate 22 and the inner connecting plate 24, and the steel wheel 14 can rotate through the two walking bearings 23.

The vibration of the steel wheel 14 is mainly realized through an eccentric rotating shaft 18, the eccentric rotating shaft 18 is arranged in the middle of the inner cavity of the steel wheel 14, two ends of the eccentric bearing 18 are respectively inserted into a first vibration bearing 17 and a second vibration bearing 19 and are movably connected with the first vibration bearing 17 and the second vibration bearing 19, the first vibration bearing 17 and the second vibration bearing 19 are respectively fixedly arranged in the middle of an inner connecting plate 24 at two sides, and the eccentric bearing 18 rotates in the inner cavity of the steel wheel 14 under the matching connection of the first vibration bearing and the second vibration bearing. One end of the eccentric bearing 18 passes through the first vibration bearing 17 and is in transmission connection with a motor shaft of the hydraulic motor 15 through the coupler 16, and the hydraulic motor 15 is fixedly arranged, so that under the driving of the hydraulic motor 15, the eccentric rotating shaft 18 rotates at a high speed in an inner cavity of the steel wheel 14 under the matching connection of the first vibration bearing 17 and the second vibration bearing 19, the rotating unbalanced mass is used as a vibration source, the centrifugal force generated by the high-speed rotation is used as an exciting force, and the strong exciting force is transmitted to the body of the steel wheel 14 through the bearing, so that periodical up-and-down compaction movement is generated, and loose soil is tamped rapidly.

In any of the above solutions, it is preferable that a hydraulic oil tank 5 is fixedly disposed on one side of the cab 3, a first hydraulic oil pipeline 6 and a second hydraulic oil pipeline 7 are fixedly connected to the hydraulic oil tank 5, a first operating valve 26 and a second operating valve 27 are fixedly disposed in an inner space of the cab 3, the first operating valve 26 is used for controlling opening and closing of the first hydraulic oil pipeline 6, and the second operating valve 27 is used for controlling opening and closing of the second hydraulic oil pipeline 7.

In any of the above schemes, it is preferable that a hydraulic cylinder 25 is hinged at the middle part of the rear end of the crawler chassis 1, the other end of the hydraulic cylinder 25 is hinged in a middle mounting seat of the pin shaft for connecting the upper connecting rod 11 and the connecting part 10, and one end of the first hydraulic oil pipeline 6 is connected with an oil port of the hydraulic cylinder 25.

In any of the above embodiments, preferably, one end of the second hydraulic oil line 7 is connected to an oil port of the hydraulic motor 15.

The fixed end of the hydraulic oil cylinder 25 is hinged to the rear end of the crawler chassis 1, one end of the travel rod is hinged to the upper car connecting frame, the upper car connecting frame can be made to move through the expansion and contraction of the hydraulic oil cylinder 25, and the vibrating wheel structure fixedly connected below the upper car connecting frame is driven to lift up and down.

When the bulldozer works, a driver controls the bulldozer to walk forwards and backwards, meanwhile, the first operating valve 26 is controlled to enable hydraulic oil stored in the hydraulic oil tank 5 to flow to the hydraulic oil cylinder 25 through the first hydraulic oil pipeline 6, the upper connecting frame is controlled to move and drive the vibrating wheel structure to lift, when the bottom of the steel wheel 14 of the vibrating wheel structure contacts a construction foundation surface, the driver further controls the second operating valve 27 to enable hydraulic oil stored in the hydraulic oil tank 5 to flow to the vibrating wheel structure through the second hydraulic oil pipeline 7, the hydraulic motor 15 is driven to work to drive the eccentric rotating shaft 18 to rotate at a high speed, and the generated strong exciting force is transmitted to the steel wheel 14 to achieve tamping operation of the steel wheel 14 on the foundation surface which is just flattened.

In any of the above embodiments, it is preferable that the wiper plates 28 are fixedly installed at both sides of the ear plate base 13, respectively. During the tamping process, the steel wheel 14 can scrape off the mud adhering to the wheel body through the mud scraping plate 28.

In any of the above schemes, it is preferable that two ends of the upper portion of the blade structure 4 are respectively movably connected to two sides of the power bin 2, and two ends of the lower portion of the blade structure 4 are respectively movably connected to two sides of the crawler chassis 1.

The foregoing has shown and described the basic principles, main features and advantages of the present utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.

The present utility model is not described in detail in the present application, and is well known to those skilled in the art.

Claims

1. A bulldozer with flattening and initial compaction functions, which is characterized in that: the crawler belt type hydraulic truck comprises a crawler belt walking chassis (1), wherein a power bin (2) and a cab (3) are respectively arranged at the front end and the rear end above the crawler belt walking chassis (1), a bulldozer plate structure (4) for flattening a foundation surface is fixedly arranged at the front end of the crawler belt walking chassis (1), and a vibrating steel wheel structure for vibrating compaction is fixedly arranged at the rear end of the crawler belt walking chassis (1);

The vibrating steel wheel structure comprises an upper connecting frame, the inner end of the upper connecting frame is fixedly connected to the end face of the rear end of the crawler chassis (1), the vibrating wheel structure is mounted at the outer end of the upper connecting frame, and the bottom of the vibrating wheel structure is in contact with a foundation surface in a working state.

2. A bulldozer with flattening and initially compacting functions according to claim 1, in which: the upper connecting frame comprises connecting lug plates (8), the lower ends of the connecting lug plates (8) are fixedly connected with the vibrating wheel structure, connecting parts (10) are formed on two sides of the upper parts of the connecting lug plates (8), an adjustable connecting unit is respectively arranged at the end parts of the two connecting parts (10), the end parts of the adjustable connecting units are movably hinged with the end parts of the connecting parts (10) at corresponding positions, and the other ends of the adjustable connecting units are respectively and fixedly connected to the rear end face of the crawler chassis (1);

The adjustable connecting unit comprises a front supporting plate (9) fixedly installed on the end face of the rear end of the crawler chassis (1), an upper connecting rod (11) and a lower connecting rod (12) are respectively connected with the upper portion and the lower portion of the front end of the front supporting plate (9) through pin shafts in a hinged mode, the rear end of the upper connecting rod (11) is connected with the upper side of the corresponding end portion of the connecting portion (10) through pin shafts in a hinged mode, and the rear end of the lower connecting rod (12) is connected with the lower side of the corresponding end portion of the connecting portion (10) through pin shafts in a hinged mode.

3. A bulldozer with flattening and initially compacting functions according to claim 2, in which: the vibrating wheel structure comprises an ear plate seat (13), the upper end of the ear plate seat (13) is fixedly connected with the lower end of the connecting ear plate (8), a vibrating wheel unit is arranged below the ear plate seat (13), two ends of the vibrating wheel unit are respectively connected with a bracket unit, and the upper ends of the two bracket units are respectively connected with two ends of the ear plate seat (13);

the vibration wheel unit comprises a steel wheel (14), and a hydraulic motor (15), a coupler (16) and an eccentric rotating shaft (18) are coaxially and fixedly connected in sequence along the axial direction of the steel wheel (14) in the inner cavity of the steel wheel (14);

A first vibration bearing (17) and a second vibration bearing (19) which are arranged in the inner cavity of the steel wheel (14) are respectively matched and arranged at two sides of the eccentric rotating shaft (18);

The support unit comprises a support plate (20), the upper end of the support plate (20) is fixedly connected to the end part of the lug plate seat (13), and a shock absorber (21), an outer connecting plate (22), a walking bearing (23) and an inner connecting plate (24) are sequentially arranged on the inner side of the lower end of the support plate (20).

4. A bulldozer with flattening and initially compacting functions according to claim 3, in which: one side of the cab (3) is fixedly provided with a hydraulic oil tank (5), a first hydraulic oil pipeline (6) and a second hydraulic oil pipeline (7) are fixedly connected to the hydraulic oil tank (5), a first operation valve (26) and a second operation valve (27) are fixedly arranged in the inner space of the cab (3), the first operation valve (26) is used for controlling the opening and closing of the first hydraulic oil pipeline (6), and the second operation valve (27) is used for controlling the opening and closing of the second hydraulic oil pipeline (7).

5. A bulldozer with flattening and initially compacting functions according to claim 4, in which: the middle part of the rear end of the crawler traveling chassis (1) is hinged with a hydraulic oil cylinder (25), the other end of the hydraulic oil cylinder (25) is hinged with a middle mounting seat of a pin shaft for connecting an upper connecting rod (11) and a connecting part (10), and one end of a first hydraulic oil pipeline (6) is connected with an oil port of the hydraulic oil cylinder (25).

6. The bulldozer with flattening and initially compacting functions according to claim 5, wherein: one end of the second hydraulic oil pipeline (7) is connected with an oil port of the hydraulic motor (15).

7. The bulldozer with flattening and initially compacting functions according to claim 6, wherein: the two sides of the ear plate seat (13) are respectively fixedly provided with a mud scraping plate (28).

8. The bulldozer with flattening and initially compacting functions according to claim 7, wherein: the two ends of the upper part of the bulldozer plate structure (4) are respectively and movably connected to the two sides of the power bin (2), and the two ends of the lower part of the bulldozer plate structure (4) are respectively and movably connected to the two sides of the crawler chassis (1).