CN214061743U - Carry scraper - Google Patents

Abstract

The utility model discloses a scraper, which comprises a bulldozing plate component, a scraper bowl, a walking swing arm wheel component and a hydraulic control system, wherein the bulldozing plate component comprises a bulldozing plate, the bulldozing plate is arranged at the inner side of the scraper bowl, the front of the scraper bowl is connected with a traction frame, and the back of the scraper bowl is provided with a connecting frame; the hydraulic control system comprises an external pump, and the external pump is connected with a PTO output shaft of the tractor through a coupler; the external pump is used for increasing the energy of the hydraulic oil of the depth limiting oil cylinder, or the external pump is used for increasing the energy of the hydraulic oil of the depth limiting oil cylinder and the bulldozer oil cylinder. And the hydraulic elements which are frequently operated are externally arranged, so that the damage and maintenance cost is low. The tractor uses more expensive hydraulic oil, and external pump only need very ordinary hydraulic oil can, and the maintenance cost reduces.

Description

Carry scraper

Technical Field

The utility model relates to a scraper, concretely relates to external scraper of hydraulic system's oil pump.

Background

In the operation mode of the scraper in the prior art, data of ground height fluctuation are detected through a satellite, a digital signal is sent to a receiver installed on a tractor, and the receiver controls a hydraulic system of the tractor according to the received signal to control the lifting of two depth wheels at the tail part and the stretching of a bulldozer cylinder. Lifting the high ground depth limiting wheel, and leveling by adjusting the soil-eating depth of the bucket; the low ground depth limiting wheels are reduced, and the soil pushing oil cylinder at the pit is used for pushing soil to be buried. The oil way is always in a frequent operation condition, so that the service life of a hydraulic system of the tractor is influenced, the maintenance cost is high, and the heat dissipation effect is poor.

SUMMERY OF THE UTILITY MODEL

In order to solve among the prior art through the hydraulic system of tractor to the limit dark hydro-cylinder of scraper and bulldoze the hydro-cylinder and realize control, there is the short and high problem of maintenance cost of hydraulic system life-span of tractor, the utility model provides an use scraper of external pump, the technical scheme of concrete adoption as follows:

a scraper comprises a bulldozing plate component, a bucket, a bulldozing oil cylinder, a traveling swing arm wheel component and a hydraulic control system, wherein the bulldozing plate component comprises a bulldozing plate, the bulldozing plate is arranged on the inner side of the bucket, a traction frame is connected to the front of the bucket, and a connecting frame is arranged behind the bucket; the walking swing arm wheel assembly comprises a swing arm joint and 2 depth limiting wheels connected by the swing arm joint, the walking swing arm wheel assembly is movably connected with the lower end of the connecting frame, and a group of depth limiting oil cylinders are arranged between the upper end of the connecting frame and the walking swing arm wheel assembly; a bulldozing oil cylinder bracket for supporting the bulldozing oil cylinder is further arranged on the connecting frame, one end of the bulldozing oil cylinder is connected with the bulldozing oil cylinder bracket, and the other end of the bulldozing oil cylinder is connected with the back surface of the bulldozing plate; the hydraulic control system comprises an external pump, and the external pump is connected with a PTO output shaft of the tractor through a coupler; the external pump is used for increasing the energy of the hydraulic oil of the depth limiting oil cylinder, or the external pump is used for increasing the energy of the hydraulic oil of the depth limiting oil cylinder and the bulldozer oil cylinder.

2 depth wheels connected with the same swing arm joint, wherein one depth wheel rises and the other depth wheel falls; as one of the depth wheels is lowered, the other is raised.

Two sets of walking swing arm wheelsets respectively have a swing arm joint to be connected, and in the middle of the work, the ground height fluctuation that two sets of tires were located is different, and single group tire relies on the swing arm swing to laminating ground, avoids one end to laminate ground one end circumstances of soaring.

The external pump is a gear pump, is connected with a PTO output shaft of the tractor through a coupler and is arranged at the tail part of the tractor.

The depth-limiting oil cylinder is opened, the depth-limiting wheel is lifted, and meanwhile, the soil-working depth of the scraper is increased; the depth limiting oil cylinder is folded, the depth limiting wheel returns to the ground, the scraper also returns to the reference surface, the soil shifting oil cylinder is opened, the soil shifting plate shifts soil, and the concave place is filled.

When the external pump is used for increasing the energy of the hydraulic oil of the depth limiting oil cylinder, the external pump is synchronously connected with the depth limiting oil cylinders through external electromagnetic valves; the bulldozing oil cylinder is connected with an electromagnetic valve on an oil way of the tractor.

Furthermore, the external pump is synchronously connected with the group of depth limiting oil cylinders through an external electromagnetic valve, and an external hydraulic lock is arranged between the external electromagnetic valve and the group of depth limiting oil cylinders; the scraper is in the transportation, and the limit for depth hydro-cylinder is all opened, uses the hydraulic pressure lock to let limit for depth hydro-cylinder and main oil circuit disconnection this moment, prevents to appear in the transportation accident.

When the external pump is used for increasing the energy of hydraulic oil of the depth limiting oil cylinder and the bulldozing oil cylinder, the external pump is connected with an external electromagnetic valve comprising 2 oil paths, one oil path of the electromagnetic valve is synchronously connected with the depth limiting oil cylinder group, and the other oil path of the electromagnetic valve is connected with the bulldozing oil cylinder. Furthermore, an external ball valve is arranged on an oil way of the electromagnetic valve connected with the rodless cavity of the depth-limiting oil cylinder group.

The reference surface is formulated through satellite signals, fluctuation of the ground is detected, and meanwhile, the signals are transmitted to the electromagnetic valve, and the electromagnetic valve controls the work of the hydraulic cylinder: when the soil is higher than the reference surface, the depth limiting oil cylinder is opened, the soil-eating depth is increased, soil shoveling is achieved, after the bucket is filled with the soil, the shovel is conveyed to a position lower than the reference surface, the depth limiting oil cylinder is folded, and meanwhile, the soil pushing oil cylinder is opened, so that soil pushing is achieved to fill.

And the hydraulic elements which are frequently operated are externally arranged, so that the damage and maintenance cost is low. The tractor uses more expensive hydraulic oil, and external pump only need very ordinary hydraulic oil can, and the maintenance cost reduces.

The utility model discloses still be provided with external hydraulic oil radiator and external hydraulic air filter, hydraulic oil radiator one end with the solenoid valve oil return opening is connected, the other end with hydraulic air filter connects, hydraulic air filter is connected with the oil tank.

The hydraulic air filter is used for filtering oil circulating in the hydraulic system and removing impurities; the radiator is used for cooling the oil, so that the oil has better stability and longer service life; the hydraulic air filter is composed of an air filter and an oiling filter, so that particle pollutants can be prevented from entering the system through a breathing port of an oil tank, and the particle pollutants can be prevented from being mixed in the oiling process.

The oil tank can be composed of hollow pipes for forming the traction frame, or is formed by welding two or more hollow pipes.

The hydraulic oil radiator can be arranged above the bucket through a bucket upper support. The solenoid valve, hydraulic lock or ball valve can also be arranged on the bracket above the bucket.

In order to enable the bulldozer to move only along a straight line in the process of front and back movement, a guide frame is arranged on the back surface of the bulldozer, the bulldozer cylinder is arranged in the guide frame, guide rollers are arranged on the left side and the right side behind the guide frame, and a guide pipe matched with the guide rollers is connected to the connecting frame; the side face of the bulldozer is in contact connection with the bucket through a side plate roller, and the bottom of the bulldozer is in contact connection with the bucket through a bottom roller.

The guide rollers ensure that the bulldozer only moves linearly in the front and rear directions; the side plate idler wheels and the bottom idler wheels ensure stable guiding and smooth bulldozing under high load, and prevent the bucket from being twisted.

The bulldozing oil cylinder is arranged in the guide frame, so that the dustproof effect is good.

The guide roller bottom gyro wheel and the guide roller is sealed non-maintaining structure, the cross-section of the profile of the gyro wheel that plays the guide effect on the guide roller is 90 contained angles, perhaps the cross-section of the profile of the gyro wheel that plays the guide effect on the guide roller is concave circular arc curve.

When the section of the outline of the roller playing a role of guiding on the guide roller is at an included angle of 90 degrees, the guide pipe matched with the guide roller is a square pipe; when the section of the outline of the roller playing a role of guiding on the guide roller is a concave arc curve, the guide pipe matched with the guide roller is a seamless circular pipe.

The utility model has the advantages that:

(1) and the hydraulic elements which are frequently operated are externally arranged, so that the damage and maintenance cost is low. The tractor uses more expensive hydraulic oil, and external pump only need very ordinary hydraulic oil can, and the maintenance cost reduces.

(2) The bulldozing oil cylinder is arranged in the guide frame, so that the dustproof effect is good, the service life is long, and the structural design is ingenious.

(3) The guide rollers ensure that the bulldozer only moves linearly in the front and rear directions; the side plate roller and the bottom roller ensure stable guiding and smooth bulldozing under high load, and prevent the bucket from being twisted; the guide roller, the side plate roller and the bottom plate roller are of sealed maintenance-free structures, and maintenance cost is reduced.

(4) The hydraulic oil radiator can be arranged above the bucket through the bucket upper support, and is ingenious in design and convenient to maintain.

(5) The cross section of the outline of the roller playing a role of guiding on the guide roller is at an included angle of 90 degrees, so that the processing cost is low; and the force guiding performance is good when the square tube is matched with the square tube.

Drawings

Fig. 1 is a first schematic structural view of a scraper according to the present invention;

fig. 2 is a second schematic structural view of the scraper of the present invention;

fig. 3 is a third schematic structural view of the scraper of the present invention;

fig. 4 is a fourth schematic structural view of the scraper of the present invention;

fig. 5 is a schematic view of a hydraulic control system for a scraper in accordance with the present invention;

FIG. 6 is a first schematic structural view of a blade assembly according to the present invention;

FIG. 7 is a schematic structural view of a bulldozing plate assembly according to the present invention;

fig. 8 is a third schematic structural view of the dozer plate assembly according to the present invention;

fig. 9 is a fourth schematic structural view of the dozer plate assembly according to the present invention;

FIG. 10 is an enlarged schematic view of the manner in which the side plate rollers are connected to the side plates of FIG. 8;

FIG. 11 is an enlarged schematic view of the attachment of the bottom roller to the bottom of the blade of FIG. 8;

FIG. 12 is an enlarged schematic view of the connection of the guide rollers to the guide frame of FIG. 8;

fig. 13 is a first structural schematic view of a first structure of a guide roller according to the present invention;

fig. 14 is a second structural schematic view of a second structure of the guide roller according to the present invention;

FIG. 15 is a schematic view in section along A-A of FIG. 14;

fig. 16 is a cross-sectional view of a side plate roller according to the present invention;

fig. 17 is a cross-sectional view of a bottom roller according to the present invention;

FIG. 18 is a schematic view of the manner in which the guide rollers of the first configuration engage the guide tube;

FIG. 19 is a partial schematic view of a second configuration of guide rollers;

fig. 20 is a schematic view of another hydraulic control system for a scraper in accordance with the present invention.

In the figure: 1. the bearing comprises a shaft, 2, a shaft sleeve, 3, a bearing, 4, a bearing limiting device, 400, a shaft sleeve inner end face, 410, a flange, 411, a gasket, 412, a snap spring, 5, a hoop, 6, a bearing sealing device, 600, a bearing sealing end cover, 610, an oil seal, 620, a dustproof sealing ring, 630, an O-shaped sealing ring, 7, a bulldozer blade, 8, a side plate, 9, a roller component, 900, a side plate roller, 910, a guide roller, 920, a bottom roller, 10, a guide frame, 11, a reinforcing rib, 12, a guide roller connecting plate, 13, a reinforcing fixing plate, 14, a bottom roller fixing plate, 15, a mud scraper, 16, a protective block, 17, a square tube, 18 and a contact surface; 19. the device comprises a traction frame, 20, a bucket, 21, an oil tank, 22, a hydraulic air filter, 23, a bucket upper support, 24, a hydraulic oil radiator, 25, a connecting frame, 26, an electromagnetic valve, 27, a hydraulic lock, 28, a depth limiting oil cylinder, 29, a bulldozer oil cylinder, 30, a depth limiting wheel, 31 and a gear pump.

Detailed Description

Example 1

Referring to fig. 1 to 5, the present embodiment is further described with reference to fig. 1 to 19, and a scraper includes a blade assembly, a bucket 20, a traveling swing arm wheel assembly and a hydraulic control system, wherein the blade assembly includes a blade 7, the blade 7 is disposed inside the bucket 20, a traction frame 19 is connected to the front of the bucket 20, and a connecting frame 25 is disposed behind the bucket 20; the walking swing arm wheel assembly comprises a swing arm joint and 2 depth limiting wheels 30 connected by the swing arm joint, the walking swing arm wheel assembly is movably connected with the lower end of the connecting frame 25, and a group of depth limiting oil cylinders 28 is arranged between the upper end of the connecting frame 25 and the walking swing arm wheel assembly; a bulldozing oil cylinder bracket used for supporting the bulldozing oil cylinder 29 is further arranged on the connecting frame 25, one end of the bulldozing oil cylinder 29 is connected with the bulldozing oil cylinder bracket, the other end of the bulldozing oil cylinder 29 is connected with the back surface of the bulldozing plate 7, the connection between the bulldozing oil cylinder 29 and the back surface of the bulldozing plate 7 can be direct connection or indirect connection, the hydraulic control system comprises an external pump, and the external pump is connected with a PTO output shaft of the tractor through a coupler; the external pump is used for increasing the energy of the hydraulic oil of the depth limiting oil cylinder.

The external pump is a gear pump 31, is connected with a PTO output shaft of the tractor through a coupler and is arranged at the tail part of the tractor.

Referring to fig. 1, 2 and 5, the gear pump is synchronously connected with the depth-limiting cylinders 28 through an electromagnetic valve 26 and a hydraulic lock 27, the returned hydraulic oil is cooled through a hydraulic oil radiator 24, filtered and impurity-removed through a hydraulic air filter 22 and then returned to an oil tank 21, and the hydraulic air filter 22 is vertically installed on the oil tank cover plate; the function of the hydraulic air filter is as follows: on one hand, the device is used for filtering oil circulating in a hydraulic system, and on the other hand, impurities are discharged; on the other hand, when the hydraulic system works, the oil level in the oil tank sometimes rises and sometimes falls, air is discharged from inside to outside when rising, and air is sucked from outside to inside when falling; in order to purify oil in the oil tank, a hydraulic air filter is vertically arranged on the cover plate of the oil tank, so that sucked air can be filtered.

When the external pump is only used for increasing the energy of the hydraulic oil of the depth-limiting oil cylinder, the bulldozing oil cylinder is connected with the electromagnetic valve on the oil way of the tractor.

Referring to fig. 1 to 4, an upper bracket 23 is disposed above the bucket 20, and a hydraulic oil radiator 24, an electromagnetic valve 26, and a hydraulic lock 27 are disposed on the upper bracket 23.

Referring to fig. 1, the front end of the bucket 20 is connected with a traction frame 19, a hollow pipe in the traction frame 19 is used as an oil tank 21, and a hydraulic air filter 22 is vertically arranged on an upper cover plate of the oil tank 21; the rear end of the bucket 20 is provided with a connecting frame 25, the connecting frame 25 comprises a first cross beam and a second cross beam, and the first cross beam and the second cross beam are correspondingly arranged up and down and connected with the inner sides of the left end and the right end of the bucket.

Referring to fig. 2, the walking swing arm wheel assembly includes a swing arm joint and a set of depth-limiting wheels 30 connected by the swing arm joint, the walking swing arm wheel assembly is movably connected to the second cross beam, a depth-limiting oil cylinder is provided between the first cross beam and the walking swing arm wheel assembly, and specifically, the walking swing arm wheel assembly is connected to the second cross beam through a pin shaft. 2 depth wheels connected with the same swing arm joint, wherein one depth wheel rises and the other depth wheel falls; as one of the depth wheels is lowered, the other is raised.

Referring to fig. 2, the back of the dozer blade 7 is connected with a guide frame 10, the dozer cylinder 29 is arranged on the inner side of the guide frame 10, as shown in fig. 1 and 2, the rear end of the connecting frame 25 is connected with a dozer cylinder support, one end of the dozer cylinder 25 is connected with the guide frame 10, the other end of the dozer cylinder 25 is connected with the dozer cylinder support, guide rollers are arranged on the left side and the right side of the rear of the guide frame, guide pipes matched with the guide rollers are arranged on the left side and the right side of the dozer cylinder support, and the dozer blade operation can be realized along with the folding of the dozer cylinder 29.

Referring to fig. 6 and 7, to further explain the blade assembly, a blade assembly includes a blade 7, side plates 8, and a guide frame 10 located on the back of the blade 7, the side plates 8 are fixed on both sides of the blade 7, the guide frame 10 is disposed on the back of the blade 7, and further includes a roller assembly 9, the roller assembly 9 includes side plate rollers 900 mounted on the side plates 8, bottom rollers 920 mounted on the bottom of the blade, and guide rollers 910 mounted on the guide frame 10; wherein, the front and the back ends of the side plate 8 are provided with side plate rollers 900.

Referring to fig. 8 and 12, the guide rollers 910 are disposed on the left and right sides of the guide frame 10, guide roller connection plates 12 are respectively disposed at the left and right ends of the rear of the guide frame, the guide roller connection plates 12 are disposed face to face, a notch for the guide roller 910 to pass through is disposed on the guide roller connection plate 12, the guide roller 910 is fixed to the outer side of the guide roller connection plate 12 through a hoop 5, and when the guide roller 910 is squeezed by a guide tube, the guide roller connection plate 12 supports the guide roller 910, and the support direction is opposite to the squeezing direction, so that the guide roller 910 is not easily deflected to the inside. In order to further strengthen and fix the guide frame connecting plates 12, the upper ends and the lower ends of the group of guide frame connecting plates 12 are respectively provided with a strengthening and fixing plate 13.

Referring to fig. 9, the lower end of the blade 7 is provided with a replaceable guard block 16, and the guard block 16 is detachably connected with the lower end of the blade 7, for example, by a countersunk screw; the protection block is made of high-wear-resistant plates.

Referring to fig. 8 and 9, the blade 7 is provided in a curved configuration, which may be formed by bending the blade section by section; in order to increase the strength of the blade, the rear face of the blade 7 is provided with reinforcing ribs 11 section by section.

As shown in fig. 9, after the bulldozer blade is bent, the bulldozer blade is approximately arc-shaped as a whole, and the upper end of the bulldozer blade points forwards and upwards, so that soil cannot be turned backwards in the processes of land leveling and earthwork transportation; in the process of shoveling soil, the soil is continuously squeezed inwards to be pressed against the bulldozing plate, and the bulldozing plate with the lower end in a nearly arc shape can reduce the resistance of soil entering; compare and be the straight plate shape in the lower extreme, when soil was constantly entering, because bulldozing board lower extreme is 90 with the scraper bowl, soil overstock in the below easily leads to into native resistance big, shovel native inefficiency.

The bulldozer blade is bent several times, the bending degree and the width of each section can be comprehensively considered, and the lower end of the bulldozer blade is required to be protected from being accumulated and turned backwards.

Referring to fig. 8 and 10, curb plate gyro wheel 900 pass through clamp 5 with curb plate fixed connection, clamp 5 and regulating plate are fixed the both sides of curb plate gyro wheel 900's axle, the bolt will clamp, regulating plate with curb plate fastening connection, be equipped with the confession on the curb plate 8 the hole that curb plate gyro wheel 900 passed, curb plate gyro wheel 900 passes hole effect on the curb plate 8 the curb plate of scraper.

Referring to fig. 7, 8 and 11, the bottom roller is connected to the blade in the following manner: the bottom of the bulldozing plate is provided with a pair of fixing plates used for being connected with the bottom roller, the fixing plates are provided with holes for the shaft of the bottom roller to pass through, and the shaft of the bottom roller is connected with the fixing plates through bolts. In this embodiment, as shown in fig. 11, a mud scraper 15 is further disposed on the bottom roller, the mud scraper can swing up and down, and if the viscosity of mud on the bottom roller is too large, a counterweight can be additionally mounted on a hole of the mud scraper; the scraper may also be arranged to be stationary.

The side plate rollers 900, the bottom rollers 920, and the guide rollers 910 are all sealed maintenance-free rollers.

With reference to FIGS. 13 to 17Explaining the structure of sealed non-maintaining gyro wheel to guide roll wheel explains as an example, as shown in fig. 13-15, a sealed non-maintaining triangle-shaped guide roll wheel, including axle 1, axle sleeve 2 and cup joint epaxial a set of bearing 3, 3 both ends of bearing are equipped with and prevent the bearing makes axial displacement's bearing stop device 4, 1 both ends of axle are equipped with and are used for with the gyro wheel carries out the axle fastener who fixes, the outer terminal surface of bearing is equipped with bearing sealing device 6, the longitudinal section of the profile that plays the guide effect on the axle sleeve 2 is 90 contained angles, contained angle department has the fillet.

Referring to fig. 15, the bearing seal device 6 includes: the bearing sealing end cover 600 is connected with the shaft sleeve 2 through a countersunk head screw; a dustproof sealing ring 620 is further arranged between the bearing sealing end cover 600 and the shaft 1; an O-shaped sealing ring 630 is arranged between the bearing sealing end cover 600 and the shaft sleeve 2; the bearing of the guide roller is free of maintenance throughout the life through multiple sealing of an oil seal, a sealing ring (comprising a dustproof sealing ring and an O-shaped sealing ring) and a bearing sealing end cover.

Referring to fig. 15, the bearing stopper 4 includes: a shaft sleeve inner end surface 400 for axially limiting the bearing 3 from the inner side of the group of bearings, and a bearing outer side limiting member for axially limiting the bearing from the outer side; in this embodiment, the bearing outer-side limiting member specifically includes: the bearing outer side limiting part of one bearing comprises a clamp spring 412 and a gasket 411, the gasket 411 is arranged between the clamp spring 412 and the bearing 3, and the clamp spring 412 axially limits the bearing 3 by pressing the gasket 411 to prevent the bearing 3 from axially moving; the bearing outer limit stop of the other bearing comprises a flange 410 provided on the shaft 1.

The bearing stop device 4 may also consider the following embodiments: the limiting parts at the outer sides of the bearings of the 2 bearings comprise clamp springs, and the clamp springs tightly press the bearings to prevent the bearings from moving axially; or the bearing outside locating parts of the 2 bearings all comprise clamp springs and gaskets, the gaskets are arranged between the clamp springs and the bearings, and the clamp springs are used for axially limiting the bearings by tightly pressing the gaskets.

Referring to fig. 15, the guide rollers are fixed at both ends of the shaft 1 by clips 5, but other fixing methods are also contemplated.

The bearing 3 is a double-row deep groove ball bearing or a double-row angular contact ball bearing.

Referring to fig. 16 and 17, the side plate roller and the bottom roller may employ the same bearing sealing means, bearing restricting means, and shaft fastening means as the guide roller as described in fig. 15.

Fig. 18 is only used for understanding the way of the triangular guide roller 910 is engaged with the square pipe 17, and the guide roller 910 is engaged with the square pipe 17 through the contact surface 18.

Example 2

Different from the embodiment 1, the guide roller is a kidney-shaped roller, referring to fig. 19, the kidney-shaped guide roller is arranged behind the guide frame, the longitudinal section of the kidney-shaped guide roller, which plays a role in guiding, on the shaft sleeve is arc-shaped, and the kidney-shaped guide roller is matched with the seamless circular pipe.

Example 3

The difference from the embodiment 1 is that the electromagnetic valve connected with the gear pump is a two-way valve, the gear pump is connected with the electromagnetic valve comprising 2 oil paths, one oil path of the electromagnetic valve is synchronously connected with the group of depth limiting oil cylinders, and the other oil path of the electromagnetic valve is connected with the dozing oil cylinder. Furthermore, an external ball valve is arranged on an oil way of the electromagnetic valve connected with the rodless cavity of the depth-limiting oil cylinder group.

Claims (10)

1. A scraper comprises a bulldozing plate assembly, a scraper bucket, a bulldozing oil cylinder, two groups of walking swing arm wheel assemblies and a hydraulic control system, wherein the bulldozing plate assembly comprises a bulldozing plate, the bulldozing plate is arranged on the inner side of the scraper bucket, a traction frame is connected to the front of the scraper bucket, and a connecting frame is arranged behind the scraper bucket; each group of walking swing arm wheel assemblies comprises a swing arm joint and 2 depth limiting wheels connected by the swing arm joint, each walking swing arm wheel group is movably connected with the lower end of the connecting frame, and a group of depth limiting oil cylinders are arranged between the upper end of the connecting frame and the walking swing arm wheel group; a bulldozing oil cylinder bracket for supporting the bulldozing oil cylinder is further arranged on the connecting frame, one end of the bulldozing oil cylinder is connected with the bulldozing oil cylinder bracket, and the other end of the bulldozing oil cylinder is connected with the back surface of the bulldozing plate; the method is characterized in that: the hydraulic control system comprises an external pump, and the external pump is connected with a PTO output shaft of the tractor through a coupler; the external pump is used for increasing the energy of the hydraulic oil of the depth limiting oil cylinder, or the external pump is used for increasing the energy of the hydraulic oil of the depth limiting oil cylinder and the bulldozer oil cylinder.

2. The scraper machine of claim 1, wherein: the external pump is used for increasing the energy of hydraulic oil of the depth limiting oil cylinder, and is synchronously connected with the depth limiting oil cylinders through external electromagnetic valves; the bulldozing oil cylinder is connected with an electromagnetic valve on an oil way of the tractor.

3. The scraper machine of claim 2, wherein: and an external hydraulic lock is arranged between the external electromagnetic valve and the depth-limiting oil cylinder group.

4. The scraper machine of claim 1, wherein: the external pump is used for increasing the energy of hydraulic oil of the depth limiting oil cylinder and the bulldozing oil cylinder, the external pump is connected with an external electromagnetic valve comprising 2 oil paths, one oil path of the electromagnetic valve is synchronously connected with the depth limiting oil cylinders, and the other oil path of the electromagnetic valve is connected with the bulldozing oil cylinder.

5. The scraper machine of claim 4, wherein: and an external ball valve is arranged on an oil way which is connected with the solenoid valve and the rodless cavity of the depth limiting oil cylinder group.

6. The scraper machine of any one of claims 2 to 5, wherein: the hydraulic oil radiator is characterized by further comprising an external hydraulic oil radiator and an external hydraulic air filter, one end of the hydraulic oil radiator is connected with the oil return port of the electromagnetic valve, the other end of the hydraulic oil radiator is connected with the hydraulic air filter, and the hydraulic air filter is connected with an oil tank.

7. The scraper machine of claim 6, wherein: the oil tank is a hollow pipe used for forming the traction frame.

8. The scraper machine of claim 1, wherein: the back of the bulldozing plate is provided with a guide frame, the bulldozing oil cylinder is arranged in the guide frame, guide rollers are arranged on the left side and the right side behind the guide frame, and the connecting frame is connected with guide pipes matched with the guide rollers; the side face of the bulldozer is in contact connection with the bucket through a side plate roller, and the bottom of the bulldozer is in contact connection with the bucket through a bottom roller.

9. The scraper machine of claim 8, wherein: the guide roller, the bottom roller and the guide roller are all sealing maintenance-free structures.

10. The scraper machine of claim 9, wherein: the section of the profile playing a guiding role on the guide roller is an included angle of 90 degrees, or the section of the profile playing a guiding role on the guide roller is a concave arc curve.

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