CN117005479A - Engineering operation vehicle - Google Patents

Abstract

The application provides an engineering operation vehicle, which relates to the technical field of engineering equipment, and comprises a chassis and an operation arm, wherein the chassis comprises a frame, a front axle, a rear axle, a left side support cylinder and a right side support cylinder; the working arm is arranged on the frame and is positioned close to the front axle; the work arm is horizontally rotatably adjustable to change the direction of work. The front axle is fixedly connected with the frame and cannot swing. The rear axle is movably connected with the frame and is allowed to rotate around the movable connection part for adjustment, so that the rear axle can be adaptively rotated for adjustment during running, the stability of the vehicle body is maintained, and the side tilting is reduced. In addition, the left side support cylinder and the right side support cylinder may be used to provide support when the working arm is working.

Description

Engineering operation vehicle

Technical Field

The application relates to the technical field of engineering equipment, in particular to an engineering operation vehicle.

Background

The engineering vehicle can be used for carrying engineering, excavating and repairing engineering vehicles with different functions, and corresponds to different operation types, such as a multifunctional bucket truck and an overhead working truck. The bucket truck can be applied to municipal works, mine works, railway works, subway works and the like in old cities. The construction vehicle needs to travel on a non-paved road surface with a hole in the working site, and is liable to roll during travel. In addition, because the working arm is arranged on the engineering vehicle, the gravity center of the working arm is higher, and the problem of overlarge roll caused by uneven pavement is more easy to occur. In addition, the work arm also requires the chassis of the work vehicle to maintain the attitude of the vehicle body on the pothole ground and provide good support during work. Therefore, there is a need for improving existing engineering vehicles employing wheeled chassis to reduce roll problems when traveling over pothole roads, to improve the passing and traveling stability of these engineering vehicles over non-paved roads, and to provide good support over pothole floors.

Disclosure of Invention

The technical problem to be solved by the application is to provide an engineering operation vehicle aiming at the defects in the prior art.

An engineering operation vehicle comprises a chassis and an operation arm; the chassis comprises a frame, a front axle, a rear axle, a left side supporting cylinder and a right side supporting cylinder; the working arm is arranged on the frame and is positioned close to the front axle; the working arm can be horizontally rotated and adjusted to change the working direction;

the front axle comprises a front axle bracket transversely arranged at the bottom of the frame, a left front wheel arranged at the left side of the front axle bracket, and a right front wheel arranged at the right side of the front axle bracket; the front axle bracket is fixedly connected with the frame;

the rear axle comprises a rear axle bracket transversely arranged at the bottom of the frame, a left rear wheel arranged at the left side of the rear axle bracket, and a right rear wheel arranged at the right side of the rear axle bracket; the rear axle bracket is movably connected with the frame and is allowed to rotate around the movable connection part for adjustment; the rear axle bracket comprises a left swinging part positioned between the left rear wheel and the movable connection part and a right swinging part positioned between the right rear wheel and the movable connection part; when the rear axle bracket rotates around the movable connecting part for adjustment, the left swinging part and the right swinging part reversely swing up and down around the movable connecting part;

the left side supporting oil cylinder is arranged between the frame and the left side swinging part of the rear axle bracket; the right side support cylinder is installed between the frame and the right side swinging part of the rear axle bracket.

In an improved technical scheme, when the included angle theta between the working arm and the front-rear direction of the chassis is smaller than a threshold value, the left side supporting oil cylinder and the right side supporting oil cylinder stretch and retract in a follow-up mode to adapt to rotation adjustment of the rear axle bracket.

In an improved technical scheme, when the working arm is horizontally rotated and adjusted to the left side of the chassis and the included angle theta between the working arm and the front-back direction of the chassis is larger than a threshold value, the left side supporting oil cylinder provides supporting force;

when the working arm horizontally rotates and adjusts to the right side of the chassis and the included angle theta between the working arm and the front-back direction of the chassis is larger than a threshold value, the right side supporting oil cylinder provides supporting force.

In an improved technical scheme, the engineering work vehicle further comprises a hydraulic adjusting system; the hydraulic adjustment system includes: a low-pressure oil way, a pressure maintaining oil way and a reversing valve; a one-way valve is arranged on the pressure maintaining oil way; the low-pressure oil way is communicated with the oil tank;

the rod cavity of the left side supporting oil cylinder and the rod cavity of the right side supporting oil cylinder are connected with a low-pressure oil way through pipelines;

the reversing valve is provided with a first oil port, a second oil port, a third oil port and a fourth oil port; when the valve core of the reversing valve is positioned at the first working position, the first oil port is communicated with the fourth oil port, and the second oil port is communicated with the fourth oil port; when the valve core of the reversing valve is positioned at the second working position, the first oil port is communicated with the third oil port, and the second oil port is communicated with the fourth oil port; when the valve core of the reversing valve is positioned at the third working position, the first oil port is communicated with the fourth oil port, and the second oil port is communicated with the third oil port;

the first oil port of the reversing valve is connected with the rodless cavity of the left support oil cylinder, the second oil port of the reversing valve is connected with the rodless cavity of the right support oil cylinder, the third oil port of the reversing valve is connected with the pressure maintaining oil way, and the fourth oil port of the reversing valve is connected with the low-pressure oil way; an oil outlet of the one-way valve is connected to one end of a third oil port close to the reversing valve on the pressure-retaining oil path;

when the included angle theta between the working arm and the front-back direction of the chassis is smaller than a threshold value, a valve core of the reversing valve is positioned at a first working position; when the working arm horizontally rotates and adjusts to the left side direction of the chassis and the included angle theta between the working arm and the front-back direction of the chassis is larger than a threshold value, the valve core of the reversing valve is positioned at a second working position; when the working arm horizontally rotates and adjusts to the right side of the chassis and the included angle theta between the working arm and the front-back direction of the chassis is larger than a threshold value, the valve core of the reversing valve is located at a third working position.

In an improved technical scheme, when the valve core of the reversing valve is positioned at the second working position, the rodless cavity of the left side supporting oil cylinder can suck oil from the oil tank through the pressure maintaining oil way, so that the reversing valve can extend out in a follow-up way;

when the valve core of the reversing valve is positioned at the third working position, the rodless cavity of the right side supporting oil cylinder can suck oil from the oil tank through the pressure maintaining oil way, so that the reversing valve can extend out in a follow-up mode.

In an improved technical scheme, when the valve core of the reversing valve is located at the first working position, the first oil port and the second oil port of the reversing valve are communicated.

In an improved embodiment, the reversing valve has a control element for switching the operating position of the valve element;

the reversing valve is arranged on the frame, and the control part of the reversing valve is driven when the working arm rotates to the angle position corresponding to the threshold value of the included angle theta, so that the working position of the valve core is switched; the included angle theta is an included angle between the working arm and the front-back direction of the chassis.

In an improved technical scheme, the reversing valve is an electric valve; the chassis is provided with a sensing device for sensing the horizontal angle position of the working arm; the electric valve and the sensing device can be linked, so that the working position of the electric valve is switched when the working arm rotates to the angle position corresponding to the threshold value of the included angle theta; the included angle theta is an included angle between the working arm and the front-back direction of the chassis.

In an improved technical scheme, the working arm is a shovel arm, and a bucket is arranged at the tail end of the working arm.

In an improved solution, the working arm includes:

the base is arranged on the frame and can be horizontally rotated and adjusted;

the first arm is a telescopic arm; the first end of the first arm is connected to the base and can be adjusted in a rotating way relative to the base;

the first end of the second section arm is connected with the second end of the first section arm and can be adjusted in a rotating way relative to the first section arm; the bucket is mounted on the second end of the second arm segment.

In the application, the engineering operation vehicle comprises a chassis and an operation arm, wherein the chassis comprises a frame, a front axle, a rear axle, a left side support cylinder and a right side support cylinder; the working arm is arranged on the frame and is positioned close to the front axle; the work arm is horizontally rotatably adjustable to change the direction of work. The front axle is fixedly connected with the frame and cannot swing. The rear axle is movably connected with the frame and is allowed to rotate around the movable connection part for adjustment, so that the rear axle can be adaptively rotated for adjustment during running, the stability of the vehicle body is maintained, and the side tilting is reduced. In addition, the left side support cylinder and the right side support cylinder may be used to provide support when the working arm is working. For more details, see the detailed description section.

Drawings

FIG. 1 is a schematic diagram of an engineering vehicle according to an embodiment of the present application.

Fig. 2 is a schematic bottom view of an engineering vehicle according to an embodiment of the application.

Fig. 3 is a schematic structural view of a chassis in an embodiment of the present application.

Fig. 4 is a schematic structural view of a rear axle according to an embodiment of the present application.

Fig. 5 is a schematic side view of an engineering vehicle according to an embodiment of the application.

Fig. 6 is a schematic top view of a working vehicle according to an embodiment of the present application.

Fig. 7 is a schematic view of the hydraulic pressure adjusting system in the embodiment of the present application.

Fig. 8 is a schematic structural view of a reversing valve in an embodiment of the present application.

Reference numerals: chassis 100, frame 110, front axle 120, front axle bracket 121, left front wheel 122, right front wheel 123, rear axle 130, rear axle bracket 131, left swing portion 1311, right swing portion 1312, left rear wheel 132, right rear wheel 133, left support cylinder 140, right support cylinder 150, work arm 200, bucket 210, base 220, first arm 230, second arm 240, hydraulic adjustment system 300, low pressure oil passage 310, pressure maintaining oil passage 320, check valve 321, reversing valve 330, and control member 331.

Detailed Description

The following are specific embodiments of the present application and the technical solutions of the present application will be further described with reference to the accompanying drawings, but the present application is not limited to these embodiments. In the following description, specific details such as specific configurations and components are provided merely to facilitate a thorough understanding of embodiments of the application. It will therefore be apparent to those skilled in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the application. In addition, descriptions of well-known functions and constructions are omitted for clarity and conciseness.

In addition, the embodiments of the present application and the features of the embodiments may be combined with each other without collision.

Referring to fig. 1-5, an engineering work vehicle includes a chassis 100 and a work arm 200; the chassis 100 comprises a frame 110, a front axle 120, a rear axle 130, a left side supporting cylinder 140 and a right side supporting cylinder 150; the working arm 200 is mounted on the frame 110 and is located near the front axle 120; the work arm 200 is capable of horizontal rotational adjustment to change the direction of work.

It should be appreciated that the work vehicle may be used for a variety of work operations, such as carrying, excavating, rush-repairing, with different work vehicles having different functions corresponding to different work types, such as a multi-function bucket truck. In an embodiment of the present application, the engineering work vehicle includes a chassis 100 and a work arm 200, and the work arm 200 is used for construction. In one embodiment of the present application, the working arm 200 is a shovel arm, and the tail end of the working arm is provided with a bucket 210, so that the working arm can be applied to municipal works, mine works, railway works, subway works and the like in old cities.

Referring to fig. 5, in one embodiment of the present application, a work arm 200 includes a base 220, a first arm 230, and a second arm 240. The base 220 is mounted on the frame 110 and can be horizontally rotated and adjusted. The first arm 230 is a telescopic arm; the first arm 230 is connected at a first end to the base 220 and is rotatably adjustable relative to the base 220. The first end of the second arm segment 240 is connected to the second end of the first arm segment 230 and is rotatably adjustable relative to the first arm segment 230; the bucket 210 is mounted on a second end of a second knuckle arm 240. The motion of work arm 200 may be driven by a hydraulic system, and the adjustment of work arm 200 includes: the rotation adjustment of the base 220, the telescopic adjustment of the first arm 230, the rotation adjustment of the first arm 230, and the rotation adjustment of the second arm 240 may be hydraulically driven. Specifically, a first hydraulic cylinder is disposed between the first arm 230 and the base 220, and the first arm 230 rotates relative to the base 220 under the driving of the first hydraulic cylinder; a second hydraulic cylinder is disposed between the second arm 240 and the first arm 230, and the second arm 240 rotates relative to the first arm 230 under the driving of the second hydraulic cylinder.

Specifically, the first arm 230 is a telescopic arm, and can be telescopically adjusted in the length direction to change its own length. The telescopic arm comprises a fixed body and a movable body, and the movable body is extended and retracted under the action of the telescopic cylinder. The telescopic arm in the prior art has various structural forms, and related contents refer to the prior art and are not repeated here.

In the embodiment of the present application, the chassis 100 adopts a wheel chassis structure, and the wheel chassis is generally composed of a drive system, a steering system, a braking system and a running system. Specifically, chassis 100 includes a frame 110, a front axle 120, and a rear axle 130, with front axle 120 and rear axle 130 mounted to the bottom of frame 110 for supporting frame 110 and walking. As the chassis drive source outputs power, the front axle 120 and/or the rear axle 130 output torque, and the chassis 100 advances or retreats.

Referring to fig. 2 and 3, the front axle 120 includes a front axle bracket 121, a left front wheel 122, and a right front wheel 123, wherein the front axle bracket 121 is transversely disposed at the bottom of the frame 110, the left front wheel 122 is mounted on the left side of the front axle bracket 121, the right front wheel 123 is mounted on the right side of the front axle bracket 121, and the front axle bracket 121 is fixedly connected with the frame 110. The front axle bracket 121 is fixedly coupled to the frame 110, and the left and right front wheels 122 and 123 are mounted at both ends of the front axle bracket 121 during traveling, so that relative vertical position floating cannot be generated.

Referring to fig. 2 to 4, the rear axle 130 includes a rear axle bracket 131, a left rear wheel 132, and a right rear wheel 133, wherein the rear axle bracket 131 is transversely disposed at the bottom of the vehicle frame 110, the left rear wheel 132 is mounted on the left side of the rear axle bracket 131, and the right rear wheel 133 is mounted on the right side of the rear axle bracket 131. Referring to fig. 4, the rear axle bracket 131 is movably connected with the frame 110, and allows the rear axle bracket 131 to be rotatably adjusted around the movable connection part. The rear axle bracket 131 includes a left swing portion 1311 and a right swing portion 1312, the left swing portion 1311 being located between the left rear wheel 132 and the swing joint portion, and the right swing portion 1312 being located between the right rear wheel 133 and the swing joint portion. When the rear axle bracket 131 is rotatably adjusted around the movable connection part, the left swing portion 1311 and the right swing portion 1312 swing up and down in opposite directions around the movable connection part.

Specifically, the position of the connection point a is shown in fig. 4, about which the rear axle bracket 131 can be rotatably adjusted. The connection portion a divides the rear axle bracket 131 into left and right parts, the left swing portion 1311 is located on the left side of the connection portion a, the right swing portion 1312 is located on the right side of the connection portion a, and the swing directions of the left swing portion 1311 and the right swing portion 1312 are opposite. Specifically, when the left swing portion 1311 swings upward, the right swing portion 1312 swings downward, whereas when the left swing portion 1311 swings downward, the right swing portion 1312 swings upward. Since the left rear wheel 132 is mounted at the left end of the left swing portion 1311 and the right rear wheel 133 is mounted at the right end of the right swing portion 1312, the left and right rear wheels 132 and 133 can be relatively floated up and down in the opposite directions to accommodate the traveling road surface.

While traveling, the rear axle 130 can be adjusted in a floating manner adaptively around the connection point a relative to the frame 110, and the front axle 120 and the frame 110 are rigidly connected. Therefore, the rear axle 130 can be adaptively adjusted along with the fluctuation of the road surface, and the frame 110 can be kept horizontal under the cooperation of the front axle 120, so that the roll is reduced.

Further, a left support cylinder 140 is installed between the frame 110 and a left swing portion 1311 of the rear axle bracket 131; the right support cylinder 150 is installed between the frame 110 and the right swing portion 1312 of the rear axle bracket 131. Left side support cylinder 140 and right side support cylinder 150 may provide support forces to increase the rigidity between frame 110 and rear axle bracket 131, if desired, to facilitate frame 110 to receive a work load from work arm 200.

It should be appreciated that the above section illustrates the floating adjustment structure of rear axle 130, as well as the supporting action of left side support cylinder 140 and right side support cylinder 150 between frame 110 and rear axle 130. Under certain conditions, when the left side support cylinder 140 and the right side support cylinder 150 are in a predetermined working state, the left side support cylinder 140 and the right side support cylinder 150 can be used to provide support for the rear axle position, so that the rear axle 130 loses the automatic floating function, and in turn, provides rigid support for the frame 110.

Referring to fig. 6, the work arm 200 can be horizontally rotated and adjusted to change the work direction, and when the angle θ between the work arm 200 and the front-rear direction of the chassis 100 is smaller than the threshold value, the left side support cylinder 140 and the right side support cylinder 150 are extended and retracted to accommodate the rotation adjustment of the rear axle bracket 131. In fig. 6, the front-rear direction S of the chassis, and the angle of the work arm 200 deviating from the front-rear direction S to the left and right are shown, when the left support cylinder 140 and the right support cylinder 150 are in the following state within the threshold range, when the cylinders follow, no power is output by themselves, the oil inlet and outlet are opened, and the movement of the mechanical part is freely telescopic. In this way, when the angle θ between the arm 200 and the front-rear direction of the chassis 100 is within the threshold range, the left side support cylinder 140 and the right side support cylinder 150 do not support the frame 110, and the frame 110 can be kept horizontal by the support of the front axle. In a specific embodiment, the threshold may be set between 10 ° and 30 °, and a typical value may be 20 °.

With further reference to fig. 6, in one embodiment of the present application, the left support cylinder 140 provides a supporting force when the working arm 200 is horizontally rotated to be adjusted to the left side of the chassis 100 and the angle θ between the working arm and the front-rear direction of the chassis 100 is greater than a threshold value. The right support cylinder 150 provides a supporting force when the work arm 200 is horizontally rotated and adjusted to the right direction of the chassis 100 and the angle θ between the work arm and the front-rear direction of the chassis 100 is greater than a threshold value. Here, when the angle at which the work arm 200 is turned to the left is greater than the threshold value, the left support cylinder 140 is not compressible, and supports the frame 110, preventing the frame 110 from tilting to the left. When the right-hand angle of the arm 200 is greater than the threshold, the right-hand support cylinder 150 is incompressible, and supports the frame 110, preventing the frame 110 from tilting right.

Referring to fig. 7, the work vehicle further includes a hydraulic adjustment system 300. Fig. 7 is a schematic diagram showing a structure of the hydraulic pressure adjusting system, and referring to fig. 7, the hydraulic pressure adjusting system 300 includes: low pressure oil path 310, pressure maintaining oil path 320, and reversing valve 330. The pressure maintaining oil path 320 is provided with a one-way valve 321, and the low-pressure oil path 310 is communicated with an oil tank. The rod cavity of the left support cylinder 140 and the rod cavity of the right support cylinder 150 are connected with the low-pressure oil path 310 through pipelines, and oil in the rod cavities of the left support cylinder 140 and the right support cylinder 150 can freely enter and exit the oil tank through the low-pressure oil path 310, so that the expansion and contraction of the oil tanks are not affected.

Further, the reversing valve 330 has a first port P1, a second port P2, a third port P3, and a fourth port P4; when the spool of the reversing valve 330 is located at the first working position, the first oil port P1 is communicated with the fourth oil port P4, and the second oil port P2 is communicated with the fourth oil port P4. When the spool of the reversing valve 330 is located at the second working position, the first oil port P1 is communicated with the third oil port P3, and the second oil port P2 is communicated with the fourth oil port P4. When the spool of the reversing valve 330 is located at the third working position, the first oil port P1 is communicated with the fourth oil port P4, and the second oil port P2 is communicated with the third oil port P3.

Further, a first oil port P1 of the reversing valve 330 is connected with the rodless cavity of the left support cylinder 140, a second oil port P2 of the reversing valve 330 is connected with the rodless cavity of the right support cylinder 150, a third oil port P3 of the reversing valve 330 is connected with the pressure maintaining oil path 320, and a fourth oil port P4 of the reversing valve 330 is connected with the low pressure oil path 310. On the pressure maintaining oil path 320, an oil outlet of the check valve 321 is connected to one end of the third oil port P3 near the reversing valve 330.

Further, when the angle θ between the working arm 200 and the front-rear direction of the chassis 100 is smaller than the threshold value, the spool of the reversing valve 330 is located at the first working position; when the working arm 200 rotates horizontally to adjust to the left side of the chassis 100 and the included angle θ between the working arm and the front-rear direction of the chassis 100 is greater than a threshold value, the spool of the reversing valve 330 is located at the second working position; when the working arm 200 rotates horizontally to adjust to the right direction of the chassis 100 and the included angle θ between the working arm and the front-rear direction of the chassis 100 is greater than the threshold value, the spool of the reversing valve 330 is located at the third working position.

As can be seen from the above-mentioned structure of the hydraulic adjustment system 300, when the angle θ between the working arm 200 and the front-rear direction of the chassis 100 is smaller than the threshold value, the spool of the reversing valve 330 is located at the first working position, the first port P1 is communicated with the fourth port P4, the second port P2 is communicated with the fourth port P4, the rodless chambers of the left support cylinder 140 and the right support cylinder 150 are connected with the low-pressure oil line 310, so as to communicate with the oil tank, the oil can freely enter and exit the oil tank, the left support cylinder 140 and the right support cylinder 150 are in a follow-up telescopic state, no supporting force is provided, and the left rear wheel 132 and the right rear wheel 133 can reversely float up and down relatively to adapt to the running road surface. When the working arm 200 rotates horizontally to adjust to the left side of the chassis 100 and the included angle θ between the working arm and the front-rear direction of the chassis 100 is greater than the threshold value, the spool of the reversing valve 330 is located at the second working position, the first port P1 is communicated with the third port P3, the second port P2 is communicated with the fourth port P4, the rodless cavity of the left support cylinder 140 is connected to the pressure maintaining oil path 320, the one-way valve 321 on the pressure maintaining oil path 320 can prevent oil from being output from the rodless cavity of the left support cylinder 140, the rodless cavity of the left support cylinder 140 is in a pressure maintaining state, so that the left support cylinder 140 cannot retract, thereby supporting can be provided, meanwhile, the rod cavity and the rodless cavity of the right support cylinder 150 are both connected to the low pressure oil path 310 and are communicated with the oil tank, and the right support cylinder 150 is in a follow-up state and can extend and retract freely. When the working arm 200 rotates horizontally to adjust to the right position of the chassis 100 and the included angle θ between the working arm and the front-rear direction of the chassis 100 is greater than the threshold value, the spool of the reversing valve 330 is located at the third working position, the first port P1 is communicated with the fourth port P4, the second port P2 is communicated with the third port P3, the rodless cavity of the right support cylinder 150 is connected to the pressure maintaining oil path 320, the one-way valve 321 on the pressure maintaining oil path 320 can prevent the oil from being output from the rodless cavity of the right support cylinder 150, the rodless cavity of the right support cylinder 150 is in a pressure maintaining state, so that the right support cylinder 150 cannot retract, and thus support can be provided, at this time, the rod cavity and the rodless cavity of the left support cylinder 140 are both connected to the low pressure oil path 310 and are communicated with the oil tank, and the left support cylinder 140 is in a follow-up state and can expand and contract freely.

With further reference to fig. 7, when the spool of the reversing valve 330 is in the second working position, the rodless cavity of the left support cylinder 140 may suck oil from the oil tank through the pressure maintaining oil path 320, so as to extend in a follow-up manner, and at this time, the left support cylinder 140 may extend forward but may not retract. When the spool of the reversing valve 330 is in the third working position, the rodless cavity of the right support cylinder 150 may suck oil from the oil tank through the pressure-maintaining oil path 320, so as to extend out in a follow-up manner, and at this time, the right support cylinder 150 may extend forward but may not retract.

With further reference to fig. 7, when the spool of the reversing valve 330 is in the first working position, the first oil port of the reversing valve 330 is communicated with the second oil port, and at this time, the rodless cavity of the left support cylinder 140 is communicated with the rodless cavity of the right support cylinder 150, and the oil can be exchanged with each other.

In one embodiment of the present application, the reversing valve 330 has a control part 331 for switching the operating position of the spool; the reversing valve 330 is mounted on the frame 110, and when the working arm 200 rotates to an angle position corresponding to the threshold value of the included angle θ, the control part 331 of the reversing valve 330 is driven to switch the working position of the valve core; the included angle θ is an included angle between the working arm 200 and the front-rear direction of the chassis 100. Here, by providing a corresponding mechanical structure in the work arm 200, the control part 331 of the reversing valve 330 is driven by the action of the mechanical structure to switch the working position.

In one embodiment of the present application, the reversing valve 330 is an electrically operated valve; the chassis 100 is provided with a sensing device for sensing the horizontal angle position of the working arm 200; the electric valve and the sensing device can be linked, so that the electric valve can switch the working position when the working arm 200 rotates to the angle position corresponding to the threshold value of the included angle theta; the included angle θ is an included angle between the working arm 200 and the front-rear direction of the chassis 100. Here, the horizontal angle position of the work arm 200 is sensed by a sensor, and the sensor outputs an angle signal, so that the electric valve can be controlled to switch the working position according to the angle signal.

In the application, the engineering operation vehicle comprises a chassis and an operation arm, wherein the chassis comprises a frame, a front axle, a rear axle, a left side support cylinder and a right side support cylinder; the working arm is arranged on the frame and is positioned close to the front axle; the work arm is horizontally rotatably adjustable to change the direction of work. The front axle is fixedly connected with the frame and cannot swing. The rear axle is movably connected with the frame and is allowed to rotate around the movable connection part for adjustment, so that the rear axle can be adaptively rotated for adjustment during running, the stability of the vehicle body is maintained, and the side tilting is reduced. In addition, the left side support cylinder and the right side support cylinder may be used to provide support when the working arm is working. The rear axle can be adjusted in a self-adaptive manner, so that the two rear wheels can be kept in contact with the ground, and the left side supporting oil cylinder and the right side supporting oil cylinder can provide supporting force when the rear axle is kept in contact with the ground.

In the foregoing embodiments of the present application, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.

Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In the description of the present application, the meaning of "plurality" means at least two, for example, two, three, etc., unless specifically defined otherwise.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the application. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the application or exceeding the scope of the application as defined in the accompanying claims.

Claims (10)

1. An engineering operation vehicle is characterized by comprising a chassis and an operation arm; the chassis comprises a frame, a front axle, a rear axle, a left side supporting cylinder and a right side supporting cylinder; the working arm is arranged on the frame and is positioned close to the front axle; the working arm can be horizontally rotated and adjusted to change the working direction;

the front axle comprises a front axle bracket transversely arranged at the bottom of the frame, a left front wheel arranged at the left side of the front axle bracket, and a right front wheel arranged at the right side of the front axle bracket; the front axle bracket is fixedly connected with the frame;

the rear axle comprises a rear axle bracket transversely arranged at the bottom of the frame, a left rear wheel arranged at the left side of the rear axle bracket, and a right rear wheel arranged at the right side of the rear axle bracket; the rear axle bracket is movably connected with the frame and is allowed to rotate around the movable connection part for adjustment; the rear axle bracket comprises a left swinging part positioned between the left rear wheel and the movable connection part and a right swinging part positioned between the right rear wheel and the movable connection part; when the rear axle bracket rotates around the movable connecting part for adjustment, the left swinging part and the right swinging part reversely swing up and down around the movable connecting part;

the left side supporting oil cylinder is arranged between the frame and the left side swinging part of the rear axle bracket; the right side support cylinder is installed between the frame and the right side swinging part of the rear axle bracket.

2. The work vehicle of claim 1, wherein the left side support cylinder and the right side support cylinder are follow-up telescopic to accommodate rotational adjustment of the rear axle bracket when an angle θ between the work arm and the front-rear direction of the chassis is less than a threshold value.

3. The work vehicle of claim 2, wherein the work vehicle is,

when the horizontal rotation of the working arm is regulated to the left side direction of the chassis and the included angle theta between the working arm and the front-back direction of the chassis is larger than a threshold value, the left side supporting oil cylinder provides supporting force;

when the working arm horizontally rotates and adjusts to the right side of the chassis and the included angle theta between the working arm and the front-back direction of the chassis is larger than a threshold value, the right side supporting oil cylinder provides supporting force.

4. The work vehicle of claim 3 further comprising a hydraulic adjustment system; the hydraulic adjustment system includes: a low-pressure oil way, a pressure maintaining oil way and a reversing valve; a one-way valve is arranged on the pressure maintaining oil way; the low-pressure oil way is communicated with the oil tank;

the rod cavity of the left side supporting oil cylinder and the rod cavity of the right side supporting oil cylinder are connected with a low-pressure oil way through pipelines;

the reversing valve is provided with a first oil port, a second oil port, a third oil port and a fourth oil port; when the valve core of the reversing valve is positioned at the first working position, the first oil port is communicated with the fourth oil port, and the second oil port is communicated with the fourth oil port; when the valve core of the reversing valve is positioned at the second working position, the first oil port is communicated with the third oil port, and the second oil port is communicated with the fourth oil port; when the valve core of the reversing valve is positioned at the third working position, the first oil port is communicated with the fourth oil port, and the second oil port is communicated with the third oil port;

the first oil port of the reversing valve is connected with the rodless cavity of the left support oil cylinder, the second oil port of the reversing valve is connected with the rodless cavity of the right support oil cylinder, the third oil port of the reversing valve is connected with the pressure maintaining oil way, and the fourth oil port of the reversing valve is connected with the low-pressure oil way; an oil outlet of the one-way valve is connected to one end of a third oil port close to the reversing valve on the pressure-retaining oil path;

when the included angle theta between the working arm and the front-back direction of the chassis is smaller than a threshold value, a valve core of the reversing valve is positioned at a first working position; when the working arm horizontally rotates and adjusts to the left side direction of the chassis and the included angle theta between the working arm and the front-back direction of the chassis is larger than a threshold value, the valve core of the reversing valve is positioned at a second working position; when the working arm horizontally rotates and adjusts to the right side of the chassis and the included angle theta between the working arm and the front-back direction of the chassis is larger than a threshold value, the valve core of the reversing valve is located at a third working position.

5. The work vehicle of claim 4, wherein the work vehicle is,

when the valve core of the reversing valve is positioned at the second working position, the rodless cavity of the left side supporting oil cylinder can suck oil from the oil tank through the pressure maintaining oil way, so that the reversing valve can extend out in a follow-up manner;

when the valve core of the reversing valve is positioned at the third working position, the rodless cavity of the right side supporting oil cylinder can suck oil from the oil tank through the pressure maintaining oil way, so that the reversing valve can extend out in a follow-up mode.

6. The work vehicle of claim 4, wherein the first port of the reversing valve communicates with the second port when the spool of the reversing valve is in the first operating position.

7. The work vehicle of claim 4 wherein the reversing valve has a control member for switching the operating position of the spool;

the reversing valve is arranged on the frame, and the control part of the reversing valve is driven when the working arm rotates to the angle position corresponding to the threshold value of the included angle theta, so that the working position of the valve core is switched; the included angle theta is an included angle between the working arm and the front-back direction of the chassis.

8. The work vehicle of claim 4, wherein the reversing valve is an electrically operated valve; the chassis is provided with a sensing device for sensing the horizontal angle position of the working arm; the electric valve and the sensing device can be linked, so that the working position of the electric valve is switched when the working arm rotates to the angle position corresponding to the threshold value of the included angle theta; the included angle theta is an included angle between the working arm and the front-back direction of the chassis.

9. The work vehicle of claim 1 wherein the work arm is a shovel arm having a bucket mounted at a distal end thereof.

10. The work vehicle of claim 9 wherein said work arm comprises:

the base is arranged on the frame and can be horizontally rotated and adjusted;

the first arm is a telescopic arm; the first end of the first arm is connected to the base and can be adjusted in a rotating way relative to the base;

the first end of the second section arm is connected with the second end of the first section arm and can be adjusted in a rotating way relative to the first section arm; the bucket is mounted on the second end of the second arm segment.